Abstract: A drain water bacteriostatic structure for an air conditioner is provided with a drain pan 8 for holding drain water generated in an air conditioner 1 and an upright antibacterial member 50 which is provided in the drain pan 8. The antibacterial member 50 is provided with an antibacterial agent 50B. The length L3 of the antibacterial member 50 in the up-down direction is set such that the lower end portion 50a of the antibacterial member 50 is immersed in drain water when the drain water is at the minimum water level L1 in the drain pan 8, and the upper end portion 50b of the antibacterial member 50 is exposed above the maximum water level L2 of drain water in the drain pan 8 by a predetermined length H or more.

Abstract: A bite-in type pipe connection structure is provided, the pipe connection structure being capable of, even if piping connection work is performed with a length of piping inserted insufficiently, minimizing deterioration of air-tightness at the joint portion, at which the piping is connected, due to an offset load acting on the piping. Also provided are a valve, a bite-in type pipe joint, and a refrigeration device using the bite-in type pipe connection structure. A ferrule 30 is provided with: a low-strength portion 34a which, when a coupling member becomes fastened to a joint body by manually rotating the coupling member, allows the distal end portion 36 of the ferrule 30 to deform so that the distal end portion 36 restrains a length of piping which is to be connected; a level changing portion 32b which connects a front tapered surface 32a, which corresponds to the low-strength portion 34a, and a rear tapered surface 32c; and a rearward portion 30A which is adjacent to the low-strength section 34a.

Abstract: In a flareless-type pipe joint, a pressing surface, which presses a rear end portion of a ferrule in the axial direction and toward the inner periphery of the ferrule, is formed in a joint body or a coupling member in which a cam surface is not formed. The ferrule has a groove that extends radially outward from the inner periphery. By pressing the rear end portion in the axial direction and toward the inner periphery by the pressing surface, the distal portion of the ferrule is pressed against the cam surface and an edge portion of the distal portion is deformed to bite into a pipe. An edge portion of a rear end portion of the inner peripheral surface of the ferrule is deformed to bite into the pipe.

Abstract: A pipe joint and a method of joining pipes using the pipe joint prevent loss of a sleeve, enhance workability in the pipe joining operation, and ensure sealing performance. The pipe joint may be utilized in a refrigerant device, a heat pump hot water supply device, a closing valve and a water supply piping. The method for connecting piping may be used in an in-the filed piping method. The pipe joint includes a joint body, a fastening member such as a nut, and a sleeve. The sleeve is integrated with the fastening member or the joint body before the fastening member is attached to the joint body. When the fastening member is attached to the joint body, the sleeve is cut off and separated from the fastening member or joint body. When the nut is fully attached, the sleeve bites into the pipe, and the pipe is joined to the joint body.

Abstract: A heat exchanger includes a plurality of flat tubes and at least one wavily folded fin disposed between a pair of the flat tubes. The fin includes a heat transfer portion having a folded portion joined to a planar portion of each of the pair of flat tubes, and a cut-and-raised portion. The cut-and-raised portion is formed by raising a periphery of a cutting line segment when a material of the fin is wavily folded. The cutting line segment is set in a vicinity of a hypothetical center line of the folded portion before the material of the fin is wavily folded. The cutting line segment is formed by a combination of cutting line segments intersecting with the hypothetical center line, or a combination of a cutting line segment intersecting with the hypothetical center line and a cutting line segment displaced with respect to the hypothetical center line.

Abstract: A heat exchanger grooved tube is made of a copper alloy having a 0.2% proof stress of greater than or equal to 40 N/mm2, and the relationship among the fin width b, the number N of fins (3), and the root thickness t is represented by 8<bN/t<20.

Abstract: A guide tapered surface 17 of a pipe coupling port 16 has a small diameter portion 17a guiding to a distal end portion 3a of a bite type sleeve 3 to bite into a coupling pipe 5 and a large diameter portion 17b sealing a tapered outer circumferential surface 33 of the bite type sleeve 3 by making close contact with the tapered outer circumferential surface 33 of the bite type sleeve 3. A tilt angle ?1 of the small diameter portion 17a relative to a central axis of the guide tapered surface 17 is greater than a tilt angle ?2 of the large diameter portion 17b relative to the central axis. Therefore, even when a distal end portion of the coupling pipe 5 is not inserted up to an innermost portion of the pipe coupling port 16, excellent sealing performance is obtained in a portion coupled to the coupling pipe.

Abstract: A drain water bacteriostatic structure for an air conditioner is provided with a drain pan 8 for holding drain water generated in an air conditioner 1 and an upright antibacterial member 50 which is provided in the drain pan 8. The antibacterial member 50 is provided with an antibacterial agent 50B. The length L3 of the antibacterial member 50 in the up-down direction is set such that the lower end portion 50a of the antibacterial member 50 is immersed in drain water when the drain water is at the minimum water level L1 in the drain pan 8, and the upper end portion 50b of the antibacterial member 50 is exposed above the maximum water level L2 of drain water in the drain pan 8 by a predetermined length H or more.

Abstract: A bite type pipe connection structure is used to connect a large diameter pipe that is previously set as a standard specification. The bite type pipe connection structure includes a spacer 71 that is used for connecting a small diameter pipe P3 and serves as insertion port adjusting means for adjusting a gap between the insertion port 16 and the small diameter pipe P3, a step portion 73 serving as a step portion for small diameter that regulates the position of the tip of the small diameter pipe P3, and insertion-through hole adjusting means for bridging a gap between the insertion-through hole for large diameter of a ferrule for large diameter and the small diameter pipe P3 to adjust the insertion-through hole. The insertion-through hole adjusting means is obtained by replacing the ferrule for large diameter 3 with a ferrule for small diameter 6. This makes it possible to connect the small diameter pipe P3 with a joint main body 1 attached to an apparatus.

Abstract: A fin tube type heat exchanger includes heat transfer fins spaced apart from each other along plate thickness directions and heat transfer tubes inserted into the heat transfer fins in directions substantially orthogonal to a gas current flow direction. Each heat transfer fin includes cut and raised parts lined up from upstream to downstream on both sides of each heat transfer tube. The cut and raised parts are inclined with respect to the gas current flow direction to guide gas current to a rear side of the heat transfer tubes. A height of each of the cut and raised parts increases gradually toward the downstream side. A value calculated by dividing an average height of each cut and raised part by a fin pitch is greater than 0.3 and less than 0.6. The fin pitch is a spacing between the heat transfer fins.

Abstract: A heat exchanger includes heat transfer tubes forming one or more refrigerant passages, and a plurality of plate-shaped fins aligned and stacked at a predetermined spacing with the heat transfer tubes passing through in a substantially perpendicular manner. A relationship between a center-to-center distance S between an adjacent pair of heat transfer tubes and an outside diameter D of the heat transfer tubes is 2.5<S/D<3.5. The center-to-center distance S is measured substantially perpendicularly to the adjacent pair of heat transfer tubes. A relationship between a length L of the one or more refrigerant passages and the outside diameter D of the heat transfer tubes is 0.28×D1.17<L<1.10×D1.17. The heat exchanger is preferably for a refrigerant circuit using either a single refrigerant or a mixed refrigerant including the single refrigerant.

Abstract: A duplex pipe fitting includes a fitting main body 1 and a pair of coupling members 2 which are threaded to both ends of the fitting main body 1. The coupling members 2 are threaded to the fitting main body 1, so that two pipes P are connected to each other with the fitting main body 1. Each coupling member 2 includes a holding portion 24 including a holding surface consisting of a pair of or a plurality of pairs of planes facing each other so that it can be held with a general fastening tool. When a rotational torque for tightening the coupling member 2 to the fitting main body 1 reaches a value indicating the completion of fastening, at least a part of the holding portion including the holding surface is separated and the pipe connecting is complete.

Abstract: A pipe joint includes a joint body and a fastening member. The fastening member includes a screw part screwed to the joint body to connect a pipe to the joint body, and a holding part configured to be nonrotatably held by a fastening tool. The screw part and the holding part are coupled to each other by a connecting structure before screwing the fastening member to the joint body. When screwing the fastening member to the joint body, the connecting structure between the holding part and the screw part is configured and arranged such that the holding part and the screw part rotate together until rotational torque applied to the holding part reaches a predetermined value larger than a rotational torque needed to completely connect the pipe to the pipe joint.

Abstract: A heat pump type hot water supply device is provided with a heat source side heat pump unit having a heat radiating heat exchanger that condenses refrigerant to radiate heat from the refrigerant. The hot water supply device is provided with a water tank that stores water, a water supply pipe that supplies water to the water tank from the outside, a water circulation pipe that is extended in a bypassing manner and circulates the water in the water tank from a bottom section to an upper section, a heat absorbing heat exchanger that is arranged on the water circulation pipe and connected to the heat radiating heat exchanger of the heat source side heat pump unit so as to absorb heat, and a hot water supply unit that comprises a hot water supply pipe that supplies warm water in the upper section of the water tank to the outside. The water supply pipe is branched into a plurality of water supply paths including a first water supply path and a second water supply path.

Abstract: A pipe joint and a method of joining pipes using the pipe joint prevent loss of a sleeve, enhance workability in the pipe joining operation, and ensure sealing performance. The pipe joint may be utilized in a refrigerant device, a heat pump hot water supply device, a closing valve and a water supply piping. The method for connecting piping may be used in an in-the filed piping method. The pipe joint includes a joint body, a fastening member such as a nut, and a sleeve. The sleeve is integrated with the fastening member or the joint body before the fastening member is attached to the joint body. When the fastening member is attached to the joint body, the sleeve is cut off and separated from the fastening member or joint body. When the nut is fully attached, the sleeve bites into the pipe, and the pipe is joined to the joint body.

Abstract: The heat exchanger includes heat transfer tubes 12, heat transfer fins 13a, which are arranged along a direction perpendicular to axes of the heat transfer tubes 12, cut-and-raised pieces 14, which are provided on a heat transfer surface of each heat transfer fin 13a. A cut, which extends along the lengthwise direction, is provided at the lower end or at the upper and lower ends of each cut-and-raised piece 14. The cuts guide condensed water generated on the surfaces of the heat transfer fins.

Abstract: In a flareless-type pipe joint, a pressing surface 25, which presses a rear end portion of a ferrule 3 in the axial direction and toward the inner periphery of the ferrule 3, is formed in a joint body 1 or a coupling member 2 in which a cam surface 19 is not formed. The ferrule 3 has a groove 36 that extends radially outward from the inner periphery. By pressing the rear end portion in the axial direction and toward the inner periphery by means of the pressing surface 25, the distal portion of the ferrule 3 is pressed against the cam surface 19 and an edge portion 3b of the distal portion is deformed to bite into a pipe p. Further, an edge portion 3c of a rear end portion of the inner peripheral surface of the ferrule 3 is deformed to bite into the pipe p.

Abstract: In a center portion of the coupling body of a bite type pipe coupling, an insertion port for receiving a connector pipe is formed at an end that faces a coupling member. In the center portion, an insertion port is formed at an end located opposite to the end that faces the coupling member. An apparatus-side pipe is inserted into and brazed to the insertion port. A thin wall portion is formed in an outer circumferential wall portion of the entrance of the insertion port for receiving the apparatus-side pipe. The outer diameter of the thin wall portion is smaller than that of the coupling body. The thin wall portion is formed in a range extending from the entrance of the insertion port to a position that is located closer to the entrance than the inner end of the insertion port and is located in the vicinity of the inner end.

Abstract: A drain pump is provided that reduces the operating noise when the head is low. The drain pump has a pump casing, and an impeller. The pump casing has a drain inlet for sucking in drain water at a lower end part and a drain outlet for discharging drain water at a side part. The impeller has a shaft part disposed extending in a vertical direction inside the pump casing, a main blade disposed on the outer circumferential side of the shaft part, an auxiliary blade disposed on the lower side of the main blade, and a disc shaped dish part disposed between the main blade and the auxiliary blade. The dish part has an annular partition part extending upward from the outer circumferential edge part of the main blade, which is disposed at a position lower than the upper end part of the partition part.

Abstract: A pipe joint has a joint body 1 attached to a device to which a pipe p is connected, a coupling member 2 threaded with the joint body 1, and a fastening jig 3 through which rotational torque is transmitted to the coupling member 2. The outer surface of the coupling member 2 is round so that the coupling member 2 cannot be held by a tool. The rotational torque is applied to the fastening jig 3 from the exterior by means of the tool. After the coupling member 2 is fastened to the joint body 1, the fastening jig 3 is removed from the coupling member 2.