Abstract: A trim member for a lighting device module includes an annular body having a first end portion that is connectable to a housing of the lighting device module and has a light receiving opening, and a second end portion opposite to the first end portion. The second end portion has a light emitting opening and is configured to be positioned outside of the housing of the lighting device module. A first curved or tapered surface extends from the light receiving opening toward the light emitting opening, and has a diameter that increases toward the light receiving opening. A second curved or tapered surface extends from the first curved or tapered surface to the light emitting opening, and has a diameter that increases toward the light emitting opening.

Abstract: A clamp lamp could clamp a screen having a front surface and a rear surface is provided. The clamp lamp includes a first clip, a second clip and a light-emitting module. When the clamp lamp clamps an edge of the screen, the first and second clips abut on the front surface and the rear surface of the screen respectively. The light-emitting module is connected to the first clip and includes a casing, a light-emitting element and a light-reflecting element. The casing has a light outlet. The light-emitting element is disposed in the casing and configured to emit a light and reflect the light to illuminate the front of the front surface through the light outlet. The light-reflecting element has first and second reflecting surfaces connected to each other. The first reflecting surface has several reflecting points, each having a radius of curvature equal to or greater than 25 mm.

Abstract: A Light Modifying Device adapted for use for photography. The Light Modifying Device is a generally bendable and durable tear-resistant material comprising of two surface faces comprising a plurality of irregularly shaped openings for receiving light therein. The Light Modifying Device can be positioned in a variety of locations and additionally manipulated by way of bending such that a portion of light may be diffused in one location in a photography set and enhanced or otherwise differently diffused on a different, second particular location of the same photography set.

Abstract: An illumination apparatus comprises a plurality of LEDs aligned to an array of directional optical elements wherein the LEDs are substantially at the input aperture of respective optical elements. An electrode array is formed on the array of optical elements to provide at least a first electrical connection to the array of LED elements. Advantageously such an arrangement provides low cost and high efficiency from the directional LED array.

Abstract: The present invention discloses a lamp and is intended to provide a novel lamp holder for a colored lamp. The key point of the technical solution of the present invention is as follows: a mounting base is fixedly connected to a pedestal through a buckle combining part; a wiring plate is arranged in the pedestal; the buckle combining part comprises a buckle arranged on the mounting base and a slot formed in the pedestal; a peripheral side of the wiring plate is provided with wiring guide blocks; each wiring guide block abuts against an inner wall of the pedestal to form a wiring through hole; the inner wall of the pedestal is provided with a positioning slot; an outer wall of the wiring plate is provided with a positioning block fitting the positioning slot; and the positioning slot and the positioning block are matched for limiting the wiring plate.

Abstract: An external connected lamp holder has a first lamp holder, the first lamp holder is provided with a first socket matched with a lamp body, the lamp body has a first driving circuit board, the external connected lamp holder further includes a first female plug assembly. The external connected lamp holder, interconnected lamp holder, driving circuit board and lamp of the embodiments realize the installation of the lamp holder and the driving circuit board through plug-in electrical connection, instead of being welded together. This construction reduces the requirements of product precision, tooling precision and assembly precision in the automated production process, and it reduces the cost of automated manufacturing and the loss in the production process of products.

Abstract: A light emitting apparatus includes a light source, a unitary formed heat sink with a plurality of heat dissipating fins, a lensed enclosure that retains a light source and at least one power consuming device other than the light source. The lensed enclosure includes a recessed opening having at least a first wall that terminates at a substantially perpendicular second wall. The plurality of heat dissipating fins are disposed on at least one adjacent exterior side of the walled enclosure, the fins extending outwardly. At least one fin coupled to the heat sink extends beyond the light source, and the heat generated by the light source travels by conduction laterally through the heat sink to the at least one coupled fin.

Abstract: A multi-button lamp power supply or controller, comprising a shell and a circuit board arranged in the shell, and further comprising: a first mode switching component, wherein one end of the first mode switching component fits with the shell, and the other end of the first mode switching component is positioned inside the shell and fits with the circuit board; and a second mode switching component, wherein one end of the second mode switching component fits with the shell, and the other end of the second mode switching component is positioned inside the shell and fits with the circuit board. The utility model has the advantages of simple operation.

Abstract: A modular and decentralized architecture for building illuminated means of egress from a device level to a building system level, wherein low and high mounted illuminated means of egress inside a building can use the same luminaire form factor.

Abstract: A lighting device system includes a lighting device module having a module housing configured to be selectively inserted through an opening in a panel or a base. Driver electronics are configured to be electrically coupled to the lighting device module. A heat sink member is located adjacent the opening in the panel or the base. A movable biasing device has a first position to apply a bias force on the module housing, pressing the module housing toward the heat sink member to increase thermal transfer. The moveable biasing device has a second position to provide improved access to the driver electronics through the opening in the panel or base relative to the first position. The movable biasing device is selectively moveable from the first position to the second position, or from the second position to the first position.

Abstract: The present invention provides a tri-proof lamp, which comprises two swivel covers, two end caps, two power guide slots, two power supply circuits, a light source unit and a lamp cover; the lamp cover has openings at both ends; the power guide slots are located inside the lamp cover; the power supply circuits are located at the power guide slots; the light source unit is located inside the lamp cover and is electrically connected to the power supply circuits; the end caps are located at the openings of the lamp cover; the swivel covers are located at the end caps.

Abstract: A steam generator system configured to burn hydrogen and oxygen at stoichiometry along with a increased-pressure water and steam. Said steam generator system comprise a hydrogen source, an oxygen source, a nitrogen source, a water source, a steam source, a hydrogen-oxygen handling unit, a cooling unit, a one or more H2-O2 steam generators and a control unit. Said steam generator system is configured to provide said hydrogen source to said hydrogen-oxygen handling unit through an oxygen passage, said oxygen source to said hydrogen-oxygen handling unit through a hydrogen passage, and said nitrogen source to selectively purge said oxygen passage and said hydrogen passage. Said water source provide water to said cooling unit. Said cooling unit is configured to receive said water source and said steam source.

Abstract: An apparatus for managing combustion optimization is provided. The apparatus for managing combustion optimization includes a data collector configured to collect real-time data that is measured in real time from a boiler system including a boiler and a combustion controller configured to control combustion of the boiler, a management configured to determine whether to perform combustion optimization of the boiler based on the real-time data, and an executor configured to generate a control command and transmit the control command to the combustion controller to perform the combustion optimization of the boiler in response to determining that the combustion optimization of the boiler is possible.

Abstract: Combustors and gas turbines are provided. A combustor includes an axial centerline and an end cover. The combustor further includes at least one fuel nozzle that extends from the end cover and at is least partially surrounded by a combustion liner. The combustion liner extends between the at least one fuel nozzle and an aft frame and that defines a combustion chamber. An outer sleeve is spaced apart from and surrounds the combustion liner such that an annulus is defined therebetween. The outer sleeve defines at least one aperture. A wake energizer is mounted on the outer sleeve. The wake energizer defines at least one passage that is angled with respect to the axial centerline of the combustor. The at least one passage aligns and is in fluid communication with the at least one aperture of the outer sleeve.

Abstract: A turbo-expanding cracking assembly includes a plurality of stages each including a rotating blade coupled to an output shaft and a fixed stator, at least one heat exchanger configured to transfer heat to an ammonia containing fuel flow, and a catalyst that is configured to decompose an ammonia containing fuel flow into a flow containing hydrogen (H2).

Abstract: An apparatus includes a high-pressure tank, a controller, a valve, controlled by the controller, and a heater.

Abstract: A method and system to treat emissions (e.g., smoke, particulate, odor, grease) employs a nanosecond high voltage pulse generator, a transient pulsed plasma reactor, and a DC voltage source that supplies a DC bias voltage, preferably a negative DC bias voltage to a conductor of the transient pulsed plasma reactor. The system is used in a scheme that substantially reduces at least particulate matter in emissions streams, for example emissions streams produced during cooking, for instance in commercial charbroiling processes (e.g., cooking of hamburger meat), or from operation of internal combustion engines. Both a reduction in the size distribution and total particulate mass is achieved using the method and system described herein.

Abstract: A kitchen hood has a first housing and a second housing that slides into and out of the first housing to adjust a length of the kitchen hood. The first housing has a fan to suction air, an outlet, and an air quality sensor assembly to continuously detect air quality in a kitchen. The second housing has an inlet and suction grill through which air is suctioned, a steam cleaning assembly to automatically steam clean an interior of the kitchen hood, and a height sensing assembly to sense a height of cookware seated on a cooktop surface below the second housing. The kitchen hood may be lengthened or shortened based on the sensed height of the cookware, and a speed of the fan and the height of the kitchen hood may be automatically adjusted based on detections by the air quality sensor assembly.

Abstract: Disclosed is a system comprising an envelope of a structure, heat pipes and fluid conduits, the envelope of the structure including at least two shells spaced apart from one another which enclose an intermediate space being sealed against an interior and exterior of the structure. First and second pipes, embedded in the exterior-facing and interior-facing shell of the structure, respectively, penetrate the envelope of the structure and together form the heat pipe for the circulation of a fluid to increase, hold or decrease heat transition through the envelope of the structure or affect heat transport into or out of the envelope of the structure.

Abstract: A district energy distributing system comprising a geothermal power plant comprising a first and a second circuit. The first circuit comprises a feed conduit for an incoming flow of geothermally heated water from a geothermal heat source; a boiler comprising a heat exchanger configured to exchange heat from the incoming flow of geothermally heated water to superheat a working medium of a second circuit of the geothermal power plant; and a return conduit for a return flow of cooled water from the boiler to the geothermal heat source. The second circuit comprises the boiler configured to superheat the working medium of the second circuit; an expander configured to allow the superheated working medium to expand and to transform the expansion to mechanical work; and a condenser configured to transform the expanded working medium to liquid phase and to heat a heat transfer fluid of a district thermal energy circuit.

Abstract: A multi-type air conditioner may include three pipes, including a high-pressure pipe, a low-pressure pipe, and a liquid line which may be connected to a plurality of indoor units, in which some of the indoor units may be operated in a cooling mode and the rest of the indoor units may be operated in a heating mode, such that waste heat from the indoor units operated in the heating mode may be recovered to be used for the indoor units operated in the cooling mode.

Abstract: An apparatus for dehumidifying ambient atmospheric air includes a first air path and a second air path. A heat exchanger system transfers at least a portion of radiated thermal energy to air drawn along the first air path to heat the air in the first air path and transfers at least a portion of the thermal energy from exhaust gas to air drawn along the first air path to heat the air in the first air path. The first air path connects the ambient atmosphere to a reactivation air outlet through the heat exchanger system and a desiccant in a second moisturized state, and the second air path connects the ambient atmosphere to a dried air outlet through the desiccant in a first dried state.

Abstract: A heating, ventilation, and/or air conditioning (HVAC) system includes a cooling circuit, a reheat circuit, a recovery circuit, and a control system. The cooling circuit includes a condenser, a compressor, an evaporator, and a three-way valve, and the HVAC system is configured to circulate refrigerant through the cooling circuit in a cooling operating mode. The reheat circuit includes a reheat heat exchanger, the compressor, the evaporator, and the three-way valve, and the HVAC system is configured to circulate refrigerant through the reheat circuit in a reheat operating mode. The recovery circuit extends between the condenser and the compressor and includes a recovery valve. The control system is configured to send a first signal to the three-way valve to switch the HVAC system between the cooling operating mode and the reheat operating mode and a second signal to the recovery valve to recover refrigerant from the cooling circuit at a subsequent time based on the first signal.

Abstract: This document describes a high efficiency dehumidification system (HEDS) and method of operating the same. The HEDS systems and physical implementations can include a variety of equipment, such as fans, filtration systems, fluid-conveying coils, piping or tubing, heat transfer coils, vents, louvers, dampers, valves, fluid chillers, fluid heaters, or the like. Any of the implementations described herein can also include controls and logic, responsive to one or more sensors or other input devices, for controlling the equipment for each implementation described herein.

Abstract: A cooling system for a photovoltaic panel including micro flat heat pipes (HP) integrated with thermoelectric generators (TEG) and a cooled water reservoir for cooling the working fluid in heat pipes. The cooled water in the reservoir is pumped from the condensate pan of an air conditioner. Experimental results show that cooling system reduced the average temperature of the panel by as much as 19° C. or 25%. Further, the output power of the photovoltaic panel increased by 44% when the photovoltaic panel was used in a very hot climate (30-40° C.). An additional two watts of power was generated by the TEGs.

Abstract: An air cooler includes a body having a top portion, a bottom portion, and a middle portion situated between the top and bottom portions. The air cooler further includes a fan disposed in the top portion of the body. The fan includes a fan hub and a plurality of fan blades centrally attached to the fan hub. The air cooler also includes a first mister disposed at a first location within the body. The first location is in front of the plurality of fan blades in the top portion of the body. The air cooler further includes a second mister disposed at a second location within the body. The second location is in front of the plurality of fan blades in the top portion of the body and different from the first location.

Abstract: An environmental control system of a vehicle including a first inlet for providing a first medium, a second inlet for providing a second medium, a compression device arranged in fluid communication with the first inlet, and an expansion device separate from the compression device. The expansion device is arranged in fluid communication with the second inlet. Energy extracted from the second medium within the expansion device is provided to one or more loads of the vehicle.

Abstract: A UFAD system with bifurcated air towers. The air towers are bifurcated in the sense that the air columns are fan-less and coil-less, and fans for delivering pressurized air to the air columns, and hence to the underfloor plenum of the UFAD system, are in overhead ceiling air ducts and spaced away from the air columns. Cooling coils could be located in a remote air handling unit that feeds conditioned air to the overhead ceiling air ducts to be pressurized by the fans.

Abstract: Air purifier systems for enclosed environments and processes for purifying air within the enclosed environments generally include four stages of filtration. The four stages of filtration include exposing the air to a carbon pre-filter followed by exposing the air to a particulate filter. The air is then fed through a photocatalytic filter and subsequently discharged back into the environment. The systems and processes deodorize, remove particulate matter and destroy airborne pathogens within the enclosed environment.

Abstract: An air purifying system may include a main air purifier placed in an indoor space, a handheld air purifier mounted on the main air purifier, and an air quality sensor IOT device that communicates with the main air purifier. The air quality sensor IOT device may be fixed in an outdoor space adjacent to the indoor space, or may be carried by a user to measure air quality data while the user travels. The main air purifier may automatically operate based on air quality data received from the air quality sensor IOT device.

Abstract: A method of controlling air quality in an indoor environment of a building is described. The method utilizes a system that comprises a carbon dioxide sensor configured to detect an instantaneous value of carbon dioxide concentration in the air of the indoor environment of the building, a control unit in signal communication with the carbon dioxide sensor, a communication unit for establishing signal communication between the carbon dioxide sensor and the control unit, and a storage unit in signal communication with the control unit.

Abstract: An infrared output device is installed in a fixed apparatus whose position is fixed in a predetermined space. An input receiving device is configured to receive, through voice input, a control command to a first-type apparatus controllable by infrared ray. Upon the input receiving device receiving the control command, the infrared output device is configured to output infrared ray to the first-type apparatus.

Abstract: An operating system includes an air conditioner and an infrared output device. The air conditioner includes an indoor unit. The infrared output device is configured to receive first information on an instruction to a first-type apparatus other than the air conditioner and operable by an infrared signal and transmit an infrared signal corresponding to the first information to the first-type apparatus. The air conditioner further includes a management device configured to manage the first-type apparatus. The management device includes a command information receiving unit configured to receive second information on a command content, and a determination unit configured to determine whether there is a deviation between a behavior of the first-type apparatus and the command content, based on the behavior of the first-type apparatus and the second information.

Abstract: An air conditioner is disclosed. The air conditioner includes a communicator, a memory including at least one instruction, and a processor configured to be connected to the communicator and the memory and control the air conditioner. The processor, by executing the at least one instruction, is configured to obtain information regarding a pet via the communicator, obtain an event for entering a pet mode, and based on the air conditioner entering the pet mode according to the event, control the air conditioner according to a first set value of the air conditioner corresponding to the pet based on the obtained information.

Abstract: An HVAC system for enhanced source-to-load matching without sacrificing airflow delivery in low load structures. Embodiments of the present disclosure provide for an HVAC system for enhanced source-to-load matching in a low load environment, i.e. dwellings with a BTU/hour capacity of less than 18,000. Prior art HVAC equipment is oversized for dwellings with a BTU/hour capacity of less than 18,000 that are insulated to minimum code requirements. Embodiments of the present disclosure provide for an HVAC system that separates the delivery of airflow (CFM) output from that of the BTU capacity output, thereby enabling a distributed delivery system for optimal source-to-load matching without sacrificing airflow delivery in low load environments. The source-to-load matching enabled by the present disclosure ensures optimal indoor air quality, enhanced comfort for occupants of the dwelling, and approximately a 60% reduction in heating and cooling costs when compared to prior art HVAC systems.

Abstract: The present application provides a sealing plate assembly and an air conditioner having thereof. The sealing plate assembly includes a first sealing plate and a second sealing plate mounted on one side of the first sealing plate. The two sealing plates can slide relative to each other. There is a sealing plate joint provided with a vent hole mounted on the first sealing plate and located at the end opposite to the end where the second sealing plate slides out of the first sealing plate. A connector is used for connecting the first sealing plate to the sealing plate joint, such that the first sealing plate and the sealing plate joint can rotate relatively by using the connector as the axis. A telescopic sealing plate assembly is formed through a relative sliding of the two sealing plates to adapt to the sizes of different windows.

Abstract: The present invention relates to a damper door (1) having an axis of rotation (3), a first face (5), and a second face opposite the first face (5), said first (5) and second faces of the damper door (1) defining a plane, said damper door (1) comprising: •a rotation shaft (9) projecting from each side of the plane defined by the first (5) and second faces of the damper door (1), and •at least one side wall (11) having a flat surface arranged radially with respect to the rotation shaft (9), characterised in that the rotation shaft (9) has, in the plane of the at least one side wall (11), a semi-elliptical shape (13) extending over the side wall (11) and comprising a large diameter (G1) coinciding with the axis of rotation (3) of the damper door (1) and a small radius (P1) parallel to the plane of the at least one side wall (11).

Abstract: In an air conditioner, a drain extraction unit and a refrigerant pipe connecting unit may be disposed in a blocking region in which a discharge port is not provided so that a size of the discharge port may be secured and the discharge port may be uniformly disposed, thereby generating uniform airflow in a room. In a lower housing formed in a circular shape, some of components inside an indoor unit of the air conditioner may be disposed in a protrusion portion that protrudes from the circular housing, thereby facilitating the installation of the air conditioner. A condensate water collecting space disposed outside the housing may be provided in a drain tray, thereby efficiently preventing a leakage due to condensate water generated outside the housing. The housing, the drain tray, and the cover member of the air conditioner may be coupled by a coupling member coupled outside.

Abstract: A heat exchanger for heating a fluid flowing through a pipe using a combustion gas includes: a body including open upper and lower ends and having a space formed therein to allow the combustion gas to pass therethrough; a combustor formed in an upper portion of the space in which combustion of the combustion gas occurs; a heat exchange portion formed below the combustor and provided with a heat exchange pipe configured to heat an internal fluid by using the combustion gas; and a heat return pipe provided outside the space so as to be in contact with an outer surface of the body, wherein the combustor and the heat exchange portion may be unitarily formed, and the body in which the combustor is formed includes a concave portion protruding concavely inward so as to correspond to a shape of an outer circumferential surface of the heat return pipe.

Abstract: A gas furnace is provided. The gas furnace includes a combustion part in which a fuel gas is burnt to generate a combustion gas, a heat exchanger having a gas flow path through which the combustion gas flows, a blower configured to blow air around the heat exchanger, and an inducer configured to discharge the combustion gas from the heat exchanger. The heat exchanger includes at least one single path in which a single gas flow path is formed a single-multiple return bend configured to communicate with the single path and convert a flow direction of the combustion gas, and at least one multiple path having a plurality of paths that communicate with the single-multiple return bend and form multiple gas flow paths.

Abstract: A water heating system can include a first tank-based water heater having a first inlet line and a first outlet line, where the first inlet line provides unheated water to the first tank, and where the first outlet line draws heated water from the first tank. The system can also include a first tankless water heater having a second outlet line, where the second outlet line of the first tankless water heater provides the heated water to a first heated water demand. The system can also include a first valve that controls an amount of the unheated water flowing through the first inlet line to the first tank-based water heater. The system can further include a controller operatively coupled to the first valve, where the controller controls a position of the first valve based on the first heated water demand and a first capacity of the first tankless water heater.

Abstract: A safety system and method to prevent water within a top portion of a tank of an electric water heater to drop below a safe temperature during a load shedding period, other than a full emergency grid failure, by a power provider whereby to prevent the propagation of harmful bacteria in a top portion the tank. A control device monitors the water temperature in the top portion of the tank by the use of a temperature sensor. If the control device detects a temperature of the water in the top portion of the tank inferior to 140 degrees F., it will by-pass the instructions of the power provider and connect power to one or more of the resistive heating elements of the tank until a predetermined temperature above 140 degrees F. is attained before switching off the resistive heating elements.

Abstract: The present invention provides a method of operating a gas heater for water including the steps of: restricting a water flow to the gas heater; determining a first rate of a first gas heating for the restricted water flow; adjusting the gas heating to the restricted water flow; repeating the previous steps until a heated water has a temperature above a temperature threshold; removing the restriction to the water flow to increase the water flow; and determining a second rate of a second gas heating for the increased water flow. The present invention also provides a gas water heater which utilises such a method.

Abstract: An apparatus includes a high-pressure tank, a controller, a valve, controlled by the controller, and a heater.

Abstract: A connected-type hot-water supply system includes hot-water supply apparatuses connected in parallel and a control means. The control means sets one main hot-water supply apparatus and sub-hot-water supply apparatuses, and performs leveling control of cumulative loads of the hot-water supply apparatuses by setting the main hot-water supply apparatus based on sequential rotation among the hot-water supply apparatuses. The control means includes a failure sign response mode in which it is determined whether there is a failure sign respectively for components of the hot-water supply apparatuses, and when a component of a part of hot-water supply apparatuses is a failure sign component determined to have a failure sign, a main use time of a hot-water supply apparatus having the failure sign component is increased, and the main use time is a main use time of serving as the main hot-water supply apparatus in the leveling control.

Abstract: A geothermal heat utilization system (10) includes a pumping well (20), a water injection well (30), a pipe (13) having two ends which are immersed in water stored in the pumping well (20) and the water injection well (30) so as to connect the pumping well (20) and the water injection well (30) to each other, a pump (21) and a pump (31) which are respectively provided inside the pumping well (20) and the water injection well (30) and pump up stored water through the pipe (13), a valve (25) and a valve (35) which are respectively provided on a pressurization side of the pump (21) inside the pumping well (20) and a pressurization side of the pump (31) inside the water injection well (30), and a heat exchanger (14) which is configured to exchange heat with the pipe (13).

Abstract: Thermal management systems are described. These systems include a refrigerant receiver configured to store a refrigerant fluid, an evaporator, a closed-circuit refrigeration system having a closed fluid circuit path, with the refrigerant receiver and evaporator disposed in the closed fluid circuit path, and the closed fluid circuit path including a condenser and compressor. These systems also include a modulation capacity control circuit configured to selectively divert refrigerant vapor flow to the condenser from the compressor by diverting a portion of refrigerant vapor flow (diverted flow) from the compressor to the refrigerant receiver in accordance with cooling capacity demand.

Abstract: The present disclosure relates to a heat pump system comprising an outdoor unit disposed in an outdoor space, a plurality of thermal load units supplied with cool air and hot air, and an intermediate unit disposed between the outdoor unit and the plurality of thermal load units, wherein the intermediate unit is connected to the outdoor unit through refrigerant pipes and connected to the plurality of thermal load units through thermal medium pipes.

Abstract: A thermal management system includes a refrigerant receiver configured to store a refrigerant fluid, an evaporator arrangement that removes heat from a heat load converting a portion of the refrigerant fluid to refrigerant vapor and a liquid separator having an inlet, a liquid side outlet, and a vapor side outlet. The system also includes a pump that pumps refrigerant liquid received from the liquid side outlet of the liquid separator and a closed-circuit refrigeration system having a closed-circuit fluid path that includes the refrigerant receiver, the liquid separator, the pump, and the evaporator arrangement, the closed-circuit refrigeration system further including a compressor and a condenser.

Abstract: Provided is a refrigerator. The refrigerator includes a main body defining a storage space, a cryogenic freezing compartment provided in the storage space, and a thermoelectric module assembly disposed at one side of the cryogenic freezing compartment so that the cryogenic freezing compartment is cooled to a temperature less than that of the storage space. The cryogenic freezing compartment includes a cryogenic case into which an insulation material is filled to be thermally insulated from the storage space and in which a cryogenic freezing space is defined, a case door opening and closing the cryogenic case, and a rail assembly connecting the cryogenic case to the case door and extending and contracted in multi-stages to allow the case door to be slid to be inserted and withdrawn. The rail assembly is mounted on the cryogenic case outside the cryogenic freezing space.