Abstract: The present invention provides a device with a combined hybrid mechanical vapour compression-adsorption cycle, particularly to devices used in moisture or temperature control applications which incorporate or embody refrigeration or heat pump cycles, such as for example HVAC applications. In this invention, heat from the adsorption process and/or condensation process of the adsorption cycle is pumped to the desorption process. Thus, this new hybrid combined cycle becomes a partially or fully electricity driven heat pump cycle.

Abstract: A throttling device is equipped with a valve seat in which a valve port for connecting a primary chamber and a secondary chamber is formed, a needle valve, a needle section which is inserted into the valve port, a guide section for guiding a slide shaft of the needle valve, and a coil spring for biasing the needle valve in a valve-closing direction. The guide section and the coil spring are positioned on the primary chamber side. The coil spring is covered by a stopper section. A gap between the stopper section and a main body case functions as a main body path for delivering a refrigerant from the primary chamber to the valve port.

Abstract: An automated refrigerant recharging system determines whether a cooling load parameter of a direct expansion (DX) cooling system that cools information technology (IT) modules of an information handling system (IHS) has reached a defined recharging threshold that results in a response of the pressure value for measurement by the pressure transducer. In response to the cooling load parameter being equal to or greater than the defined recharging threshold, a controller determines whether a pressure value of the refrigerant of the DX cooling system is less than a defined target pressure value corresponding to the defined recharging threshold. In response to determining that the pressure value of the refrigerant of the DX cooling system is less than the defined target pressure value, the controller autonomously opens a control valve to transfer refrigerant to the DX cooling system.

Abstract: A heating, ventilation, and air conditioning system may include a refrigerant loop to circulate refrigerant, a first valve, a second valve, a sensor to measure parameters of the refrigerant, a refrigerant tank fluidly coupled to the refrigerant loop via the valves, and control circuitry communicatively coupled to the sensor, the first valve, and the second valve. The control circuitry may determine environmental conditions and detect whether an undercharge or overcharge condition is present in the refrigerant loop based at least in part on the environmental conditions and the measured parameters. The control circuitry may also instruct the first valve to open when the undercharge condition is detected to facilitate flowing refrigerant from the refrigerant tank into the refrigerant loop and instruct the second valve to open when the overcharge condition is detected to facilitate flowing refrigerant from the refrigerant loop into the refrigerant tank.

Abstract: A control method for a refrigerator comprises: decreasing an output of at least one of a cold air supply means for a first storage chamber or stopping the cold air supply means, if a sensed temperature of the first storage chamber reaches a value less than or equal to a second reference temperature; increasing the output, if a certain time has passed after the temperature has reached the value less than or equal to the second reference temperature, or if the temperature reaches a first specific value between a first reference temperature and the second reference temperature; and decreasing the output or stopping the cold air supply means, if a certain time has passed after the output of the air supply means has been changed in a previous step, or if the temperature reaches a preset second specific value between the first specific value and the second reference temperature.

Abstract: A safety device for an ice machine comprising a cover-type body (1), with a spherical cap shape, which is articulated on one of the ends (1a) thereof, while on the other end (1b) thereof it has a floating character and incorporates protuberances (1c) that make up the arrangement of an elastic closure (2) responsible for fastening said body to the ice machine (10); and wherein electronic means (3) are located adjacently to the body (1) in the placement area of an end of the elastic closure (2), which are responsible for detecting the change in position or opening of said body (1) and sending machine stop and breakdown warnings.

Abstract: Systems and apparatuses for making ice and ejecting the ice from an ice formation cell. In one example, a system includes an ice formation cell, a refrigerant tube, and an ejector. The refrigerant tube is disposed within the ice formation cell. A portion of the water stream can freeze on the refrigerant tube to generate the ice piece. The ejector rotates about an axis. When rotating, the ejector pries an ice piece away from the refrigerant tube disposed the ice formation cell.

Abstract: A refrigeration appliance includes a fresh food compartment and a freezer compartment. An ice maker with an ice mold is disposed within the fresh food compartment for freezing water into ice pieces. A refrigeration system includes a system evaporator and an ice maker evaporator dedicated to cooling the ice mold. A frame rotatably supports the ice mold within the fresh food compartment between an ice-forming position and an ice-harvesting position. The frame supports the ice maker evaporator at a stationary position that serves as a pivot axis for the ice mold so the ice mold can rotate around the ice maker evaporator between the ice-forming position and the ice-harvesting position, while the ice maker evaporator remains stationary. In one example, a heater is rotatable with the ice mold, and a drip tray is located underneath ice mold and rotatable with the ice mold.

Abstract: A refrigerator utilizes in some instances an icemaker having a tandem arrangement of storage bins. A first storage bin receives ice produced by an icemaker and includes a reversible ice mover that when operated in a first direction feeds an ice dispenser, and when operated in a second direction feeds a second storage bin disposed below the first storage bin. A refrigerator may also in another aspect include an externally-accessible ice dispenser having a dispenser recess portion that is removable from the refrigerator when the doors of the refrigerator are closed, e.g., for the purpose of accessing an ice storage bin.

Abstract: A stop sensor for an ice machine comprising a casing made up of a base and a cover, wherein the base acts as a housing for a sensor protected by glass, and which is arranged in an electronic board which in turn houses at least electronic means which send the stop signal; a probe, a light emitting diode and a switch; and in that the cover of the casing has a hole wherein a cap is housed which protects the sensor from possible inlets of water during the operation of the machine, and wherein in turn, said hole will coincide with the area where the button of the switch is located.

Abstract: A modular shipping system includes a bulk shipping space; and a base to support a pair of stackable cryogenic shipping subunits positioned in the bulk shipping space during long distance shipment, each subunit having a plurality of feet on a subunit bottom adapted to rest above a plurality of corresponding foot receptacles on a subunit lid, each subunit having its own cryogen connection source to maintain temperature during transit.

Abstract: A refrigerator includes a cabinet, an evaporator, an evaporator cover module defining an evaporator cover module, a cold air supply module configured to communicate with an upper end of the evaporator cover module, the cold air supply module including a discharge port, and a blower fan. The cold air supply module includes a lower passage configured to communicate with the evaporator cover module, and an upper passage configured to communicate with the discharge port. The cold air supply module defines a communication hole at a position where the upper passage and the lower passage overlap each other, and the blower fan is located at the communication hole to cause suction of cold air from the heat-exchange space and discharge of cold air to the discharge port.

Abstract: A refrigeration appliance includes a freezer compartment. An ice maker return duct fluidly couples an ice maker compartment and the freezer compartment. A pressure sensor is positioned within the freezer compartment and is configured to detect a pressure differential between the freezer compartment and an external environment. A fan is positioned within the ice maker return duct and is configured to be activated when the pressure within the freezer compartment is lower than the external environment.

Abstract: A refrigerator assembly includes a cabinet defining a storage compartment and a door for providing selective access to the storage compartment. The refrigerator assembly further includes a mullion assembly having a hinge coupled to the door and a flipper mullion pivotally attached to the hinge. The flipper mullion is rotatable between a first position, a second position, and an intermediate position that is intermediate the first and second positions. The mullion assembly further includes a spring configured to bias the flipper mullion toward the first position when the flipper mullion is between the first position and the intermediate position. The spring is further configured to bias the flipper mullion toward the second position when the flipper mullion is between the second position and the intermediate position. The mullion assembly further includes a magnetic assembly configured to bias the flipper mullion toward the second position.

Abstract: A vacuum adiabatic body is provided. The vacuum adiabatic body may include a first plate, a second plate, a seal, a support, a heat resistance device, and an exhaust port. The support may include at least two bars to support the first plate and the second plate. Each of the at least two bars may include a material having a lower emissivity than emissivities of each of the first and second plates, and each bar may be fabricated using at least one material selected from the group consisting of polycarbonate (PC), glass fiber PC, low outgassing PC, polyphenylene sulfide (PPS), and liquid crystal polymer (LCP).

Abstract: A refrigerator includes an inner liner, an outer wrapper and a trim breaker that extends between the inner liner and the outer wrapper to define an insulated structural cabinet. The trim breaker includes a plurality of gas-blocking flakes, wherein each gas-blocking flake includes a longitudinal axis that extends substantially parallel with an elongated surface of the respective gas-blocking flake. The longitudinal axis and the elongated surface of each corresponding gas-blocking flake is oriented to be substantially parallel with a portion of an outer surface of the trim breaker located near the respective gas-blocking flake.

Abstract: A fluid delivery system for an appliance includes a fluid line in selective communication with a fluid source. A shelf defines a fill zone positioned below an underside of the shelf. A shelf spigot is coupled with the fluid line and disposed proximate the underside of the shelf and over the fill zone. A fluid level sensor is positioned in communication with the fill zone. The fluid level sensor is also in communication with a controller that regulates a flow of fluid through the shelf spigot.

Abstract: A refrigerator includes a control module which controls a first compressor, a second compressor, a first fan, a second fan, and a third fan, in which the control module performs a high-temperature initial simultaneous operation when the outside air temperature is at the outside air set temperature or more, performs a high-temperature initial alternation operation when the freezing compartment temperature is at the freezing compartment set temperature or less and the refrigerating compartment temperature is at the refrigerating compartment set temperature or less during the high-temperature initial simultaneous operation. The control module drives the first compressor and the second compressor together during the high-temperature initial simultaneous operation, and alternately drives the first compressor and the second compressor during the high-temperature initial alternation operation.

Abstract: The present invention relates to a refrigerant composition comprising neon and hydrogen. The present invention further relates to the use of the refrigerant composition in liquefying gaseous substances such as hydrogen or helium.

Abstract: The present invention is a portable drier with solar simulator that can be used by small or medium scale farmers, which provides drying of the fruits and vegetables in general in the agriculture sector, in an organic manner through natural methods, which benefits from IR and UV rays during this process, and as a result, creates a difference in the extension of their shelf life, and which, in order to protect human health, minimizes the chemical remnants that cause diseases.

Abstract: A radio frequency (RF) laundry dryer includes, amongst other things, an RF generator and a drying surface. The drying surface on which textiles are supported further includes an RF applicator having an anode and cathode coupled to the RF generator. At least a portion of the cathode substantially encompasses the anode to electrically shield the anode ensuring the formation of an e-field between the anode and cathode instead of the anode and the Faraday cage upon energizing the RF generator.

Abstract: A thermal process device for heat treating a product or plurality of products includes a thermal processing chamber having opposed distal ends and at least one controllable heating zone. At least one buffer zone disposed is at each of the distal ends, the buffer zones and at least one heating zone of the thermal processing chamber forming a heating element assembly having an inner and outer surface. At least one layer of insulating material is disposed along the at least one buffer and heating zones of the thermal processing chamber and forming part of the heating element assembly, the at least one layer of insulating material having a controlled efficiency being applied non-uniformly across an axial length of the heating assembly.

Abstract: A method for repairing a refractory lining of a metallurgical vessel in the hot state. This repair takes place using a supplying apparatus. In addition, recording of at least the worn regions and monitoring of the repair are carried out by a monitoring device. Before, during and/or after the supplying of material, at least a partial region of the areas of the refractory lining of the vessel or the gunning jet is recorded photographically with visualization of the temperature ranges. This results in an evaluation with regard to different parameters such as properties, layer thickness and/or distribution of the supplied material. It has been demonstrated that visualization of the temperature ranges of the areas to be repaired and of the refractory material during supplying of material enables different parameters to be established very accurately, and as a result, optimal coating of the wall lining can be achieved.

Abstract: Liquid is delivered into a void between a burner and a melt vessel, which causes a skull of a material to form within an interior of the melt vessel. The void is in fluidic communication with the interior of the melt vessel. The burner is moved from a first position internal to the void to a second position external from the void. Thereafter, the burner is isolated from the void.

Abstract: A heat exchanger designed to be fixed to a turbomachine wall delimiting a gas flow stream, this exchanger including a body with a front face through which the gas flow passes; an attachment face to the wall; an external face opposite the attachment face and connected to the front face; two lateral faces connected to the front face; a cover surrounding the front face and extending along the prolongation of the external face and the lateral faces, to delimit an intake with an area smaller than the area of the front face, this intake being located upstream from the front face relative to the gas flow stream.

Abstract: A side slit of a core plate of a heat exchanger reaches a sealing surface. The core plate has a rib which is formed on a bottom plate across a protruding portion. The rib communicates to a cavity above the sealing surface. An end slit formed on an end wall of the core plate reaches the sealing surface. A first joining tab is formed between two end slits. The first joining tab is joined to a second joining tab on a reinforce plate. The side slit and the rib enable deformation of the core plate. The end slit enables deformation of the first joining tab in a tilting manner.

Abstract: A heat exchanger, in particular exhaust-gas cooler, is described herein. The heat exchanger includes tubes of unipartite form or formed from two plates. The tubes form a first and a second fluid duct, and the respective fluid ducts are arranged adjacent to one another. The first fluid duct is designed to be open at at least one of its ends for the inflow and/or outflow of a first fluid. The second fluid ducts are closed at an end side of the tubes by way of an inward or outward step. The step has a greater extent T in the tube longitudinal direction in the corner regions of the tube than between the corner regions. Several non-limiting descriptive embodiments are disclosed herein.

Abstract: In some examples, a heat exchanger includes an outer shell defining an open cavity configured to receive heat exchanger core components. The heat exchanger core components may include a layer of hot passageway components configured to be separated from a layer of cold passageway components by a tube sheet. In some examples, the outer shell defines one or more alignment features on an inner wall of the open cavity, the one or more alignment features being configured to align the heat exchanger core components within the open cavity when inserted in the open cavity. The heat exchanger further comprises a cover configured to be attached to the outer shell via one or more braze joints to enclose the core components within the open cavity of the outer shell.

Abstract: A plate heat exchanger comprises first heat exchanger plates, second heat exchanger plates, first plate interspaces each formed by a primary pair of one second heat exchanger plate and an adjacent first heat exchanger plate, and second plate interspaces each formed by a secondary pair one first heat exchanger plate and an adjacent second heat exchanger plates. Each first heat exchanger plate comprises a peripheral rim surrounding a first porthole and defining an inlet channel for a first fluid through the plate heat exchanger. Each secondary pair encloses an inlet chamber adjacent to the peripheral rim. The inlet chamber is closed to the second plate interspaces, open to the inlet channel and communicates with one of the first plate interspaces via a nozzle member, thereby permitting a flow of the first fluid from the inlet channel to the first plate interspace.

Abstract: A heat transfer device including a body bounding a cavity for receiving a heat transfer medium, an inlet, and an outlet for providing a fluid connection to the cavity is provided. Interconnecting elements are provided at each of the inlet and outlet for providing a fluid connection to the inlet and the outlet. At least one interconnecting element is configured to interconnect with, and provide relative movement between and a substantially consistent fluid connection with, an interconnecting element of an adjacent device, such as a similar heat transfer device, over a range of spacing between bodies of the devices.

Abstract: A heat pipe device comprising at least two of the following: an axially grooved bore for thermal transport, the axially grooved bore having an axial groove wick; a phase change material bore for thermal storage, the phase change material bore having internal fins to enhance heat transfer, the internal fins extend along the axis of the phase change material bore; and a porous media bore for accepting high heat fluxes, the porous media bore having a porous media wick in areas of high heat flux.

Abstract: The present invention concerns a device and a process for the storage and restitution of heat which comprises at least two concentric heat storage volumes (TES1, TES2, TES3). The walls (2) delimiting these storage volumes are configured in a manner such that the thickness of the wall delimiting the central storage volume is greater than the thickness of the wall delimiting the peripheral storage volume.

Abstract: A heat transfer element for a rotary heat exchanger includes a plate having a plurality of elongate notches formed therein at spaced intervals and oriented at a first angle relative to a flow direction. The plate further includes a plurality of elongate undulations formed therein at spaced intervals and oriented a second angle relative to the flow direction, wherein the first angle is different than the second angle. A first height of each of said plurality of elongate notches is larger than a second height of each of said plurality of elongate undulations. A plurality of heat transfer elements may be stacked in a container for installation in the rotary heat exchanger.

Abstract: A rotary heat exchanger for preheating air using waste heat includes a plurality of heat transfer elements movable between first and second openings in a housing to exchange heat between heated exhaust gases and a stream of fresh air. At least one heat transfer element includes a first plate having a plurality of elongate notches formed therein at spaced intervals and oriented at a first angle relative to the flow direction. The plate also includes a plurality of turbulators formed in the spaced intervals between the plurality of elongate notches, the plurality of turbulators being arranged in a two-dimensional pattern. The heat transfer elements may be stacked in a container for installation in the rotary heat exchanger.

Abstract: A heat exchange system with at least one heat exchange chamber is provided. The heat exchange chamber includes heat exchange chamber boundaries which surround at least one heat exchange chamber interior of the heat exchange chamber. The heat exchange chamber boundaries include at least one first opening for guiding in an inflow of at least one heat transfer fluid into the heat exchange chamber interior and at least one second opening for guiding out an outflow of the heat transfer fluid out of the heat exchange chamber interior. At least one heat storage material is arranged in the heat exchange chamber interior such that a heat exchange flow of the heat transfer fluid through the heat exchange chamber interior causes a heat exchange between the heat storage material and the heat transfer fluid.

Abstract: A heat exchanger comprises a number of identical heat exchanger plates stacked in a stack. Every other heat exchanger plate is turned 180 degrees in its plane relative to its neighboring plates, and each heat exchanger plate comprises at least four port openings and a herringbone pattern comprising pressed ridges and grooves. The ridges and grooves are adapted to keep the plates on a distance from one another under formation of flow channels, wherein areas around the port openings are arranged on different levels, such that selective flow from the port openings to the flow channels is achieved. Dents are arranged in the ridges and grooves in the vicinity of any of the port openings, the dents being arranged to increase the flow resistance to promote a more even flow distribution in the flow channel.

Abstract: In a laminated core type heat sink in which a plate is formed by arranging a plurality of slits in parallel to a metal flat plate and by laminating the plate in large numbers, the thickness of a second plate positioned second in the lamination direction from an end lid to which a semiconductor is attached is made greater than thickness of a first plate other than the second plate.

Abstract: An apparatus is provided herein. The apparatus includes a support member, a supply channel, a return channel, a supply port to provide a fluid to the supply channel, a return port to receive the fluid from the return channel, at least two port fittings, a first sleeve, and a second sleeve. The first sleeve is connectable to one of the at least two port fittings and forms a fluid tight seal between the first sleeve and the supply channel. The second sleeve is connectable to the other of the at least two port fittings and forms a fluid tight seal between the second sleeve and the return channel.

Abstract: Heat exchangers and methods for assembling a heat exchanger are described, such as for example a round tube heat exchanger, which may be a fin and tube heat exchanger, and which may be used for example in a heating, ventilation, and air conditioning system (HVAC) system and/or unit thereof. The heat exchanger includes aluminum tubes mechanically rolled into an aluminum tube support and the tubes are fluidically sealed with the tube support. The aluminum tube support including the aluminum tubes rolled therein is assembled to a fluid manifold configured to allow fluid flow through the heat exchanger and into and/or out of the heat exchanger.

Abstract: A single bolt-action receiver with a lower having the ability to accept multiple shaped magazines through an interchangeable magazine well, defining a magazine chamber shape. The interchangeable magazine wells may further comprise a first flange and a first aperture and a second flange and a second aperture. The first interchangeable magazine well defining a first magazine chamber shape, may be configured to receive a first ammunition magazine containing a first shape and first caliber ammunition. The first interchangeable magazine well can be removed and a second interchangeable magazine well containing a second chamber shape, may be configured to receive a second ammunition magazine shape containing a second shape and second caliber ammunition.

Abstract: A method and apparatus for storing and loading ammunition cartridges are disclosed. An ammunition apparatus may comprise a bay that is substantially cylindrically shaped, an access channel, a slide restraint, and a saddle. The access channel may be a cross sectional cutout in the bay. The slide restraint may comprise five fins shaped to track the contour of the tapered end of a cartridge. The saddle may be disposed on the outside of the bay, opposite the access channel, and may be shaped to complement the contour of a cartridge. An ammunition tray may comprise multiple ammunition apparatuses secured together. A user may load a cartridge from an ammunition tray into a magazine by using an ammunition apparatus saddle to partially displace an already loaded cartridge and then using his or her thumb to slide a cartridge from the ammunition tray into the magazine.

Abstract: Systems and methods for controlling a firearm. Components embedded in a portion of the firearm enable the firearm to determine if a user of the firearm is authorized to do so, and either enable or disable a firing mechanism of the firearm accordingly. The firearm may also send communication signals regarding the status of the firearm or events detected by the firearm to a remote device controlled by an authorized user. The system may thereby notify the authorized user of attempted unauthorized use of the firearm, that the firearm has been left behind by the authorized user, or that the firearm is being tampered with. The system may also include multi-tag or a voice-override features that prevent the firearm from being used against the authorized user should the authorized user lose control of the firearm.

Abstract: Methods and apparatuses are disclosed for increasing the safety of a handgun. In certain implementations, the apparatus provides a safety device that includes a cover having an ejecting unit, a locking pin, and a releasing plate. The safety device is configured to cover both sides of a trigger guard of the handgun when the safety device is locked to the handgun. The releasing plate is coupled to the locking pin. The releasing plate is disposed on a surface of the safety device so as to be accessible by the user. Preferably, the releasing plate is activated by a user's finger. The releasing plate selectively disengages the locking pin from the trigger guard by movement of the user's finger. When engaged, the locking pin prevents the safety device from being removed from the handgun. When disengaged, the locking pin allows the safety device from being removed from the handgun. In certain embodiments, the ejection unit self-ejects the safety device from the handgun.

Abstract: A toolless slide backplate for a firearm that comprises an extractor lock and a striker assembly lock. The extractor lock is dimensioned to cover and contact an extractor plunger when installed, and is held in place via an interplay with the extractor plunger. The striker assembly lock is dimensioned to cover the striker components when installed. The striker assembly lock covers the trigger connector of the frame of the firearm such that a disassembly opening is not required.

Abstract: A sealed trigger housing according to various aspects of the present technology is configured to provide a more effective method of preventing foreign debris from entering the trigger housing. Various embodiments of the sealed trigger housing comprise a pair of side plates configured to at least partially house a trigger, a hammer, and a selector switch within an interior portion of the trigger housing. A plurality of sealing elements may be used to create a seal around any component that protrudes outwardly from the trigger housing.

Abstract: Various examples of a modular trigger control unit for firearms are described. The trigger control unit can be removably installed on a grip frame and installed between the grip frame and a slide assembly of a semi-automatic firearm. The trigger control unit includes at least a trigger pin and a trigger pivotable around the trigger pin when pulled. In response to the trigger being pulled by a user when the trigger control unit is installed between the grip frame and the slide assembly, a firing pin lug of a striker-firing mechanism in the slide assembly is released thereby allowing a striker of the striker-firing mechanism to move forward with respect to the slide assembly. Moreover, the trigger control unit is secured to the grip frame at least by the trigger pin such that removal of the trigger control unit from the grip frame requires removal of the trigger pin.

Abstract: A trigger assembly for a firearm is disclosed wherein the firearm includes a receiver, a safety selector and a hammer. The trigger assembly includes a trigger having a pivot axis, a front hook which is constructed and arranged to move with trigger rotation, a rear hook which is cooperatively arranged with the front hook and a spring which is positioned between the front hook and the rear hook. The front hook and the trigger are constructed and arranged relative to the safety selector and relative to the hammer in order to allow the hammer to be recocked from an upright position with the safety selector in a “SAFE” position. This particular construction provides a trigger assembly which is constructed and arranged as a two-stage, drop-in trigger assembly which is compliant with the European Standard for an M4/M16 (AR) platform.

Abstract: A fire control assembly and a method are disclosed. The fire control assembly contains a pivotable shaft containing a first end and a second end, and a first selector member removably coupled with the first end of the pivotable shaft, wherein the first selector member is movable between a first position relative to the pivotable shaft and a second position relative to the pivotable shaft, wherein the first selector member is configured to rotate the pivotable shaft from a safe position to a firing position and back to the safe position when the first selector member is in the first position relative to the pivotable shaft, wherein the first selector member is configured to prevent the pivotable shaft from rotating into the firing position when the first selector member is in the second position relative to the pivotable shaft.

Abstract: A ballistic adjustment device for toy gun, includes a mounting member having a bearing portion located above a bullet barrel. When the mounting member moves up and down, a pressure member is released from or pressed against the bullet barrel to move a protruding portion of the bullet barrel up and down. A connecting rod is pivoted to a lower part of the mounting member and has a press portion that is pressed against an inclined surface of the rotary member. The rotary member is in communication with a magazine seat, such that the rotary member can be turned only by extending the operator's finger into the magazine seat, which makes the press portion moves high and low on the inclined surface, so as to move the connecting rod and the mounting member, and make the bearing portion move up and down to achieve the function of adjusting the trajectory.

Abstract: An automatic cleaning apparatus for a gun barrel is provided. The apparatus includes a cleaning unit rotating in contact with an inner surface of a gun barrel while moving along the inner surface. The cleaning unit includes an internal gear section having mounting recesses disposed along an outer circumference thereof, a connector section inserted into the mounting recess, a cleaning section detachably coupled to the connector section, a fastening section coupled to the internal gear section, and an engaging section having a first part rotatably coupled to the internal gear section and a second part rotatable about the first part so as to open or close a front side of the connector section depending on a rotary direction of the second part.