WO2021191963A1

WO2021191963A1 - Hot water generation device

Info

Publication number: WO2021191963A1
Application number: PCT/JP2020/012707
Authority: WO
Inventors: 一仁若月
Original assignee: 東芝キヤリア株式会社
Priority date: 2020-03-23
Filing date: 2020-03-23
Publication date: 2021-09-30
Also published as: EP4130601A1; CN115103984A; AU2020438326B2; EP4130601A4; CN115103984B; AU2020438326A1

Abstract

Provided is a hot water generation device which can connect hot water supplying crossover piping extending to a hot water supply place, without loosening of a screw-in type pipe joint of a circulation pump or causing water leakage following the loosening of the screw-in-type pipe joint of the circulation pump. This hot water generation device (1) comprises: a housing (51) having a joint insertion hole (77); a pump (36) having a pump inlet pipe joint (72) and a pump outlet pipe joint (73); and a hot water supply pipe connection joint (48) which is fixed to the pump outlet pipe joint (73) and protrudes to outside of the housing (51) via the joint insertion hole (77), and which can connect, outside of the housing (51), hot water piping (47) that sends hot water to the hot water supply place.

Description

Hot water generator

An embodiment of the present invention relates to a hot water generator.

For example, a heat pump type hot water generator is equipped with a water heat exchange for heat exchange between a refrigerant and water, and a circulation pump for sending hot water after the heat exchange to a hot water supply destination or a hot water storage device. In such a device, a pump support base that is fixed on the bottom plate of the housing and supports the circulation pump is known.

The pump support base is provided with a bottom wall plate and left and right standing wall plates provided on both sides of the bottom wall plate. The left and right standing wall plates sandwich the motor housing of the circulation pump. The upper end of one of the standing wall plates is in contact with the convex portion of the motor housing. A pump fixture is attached to the other standing wall plate. The pump fixture is caught in a part of the motor housing to prevent the circulation pump from moving in the axial direction, and cooperates with one of the standing wall plates to prevent the circulation pump from rotating in the circumferential direction.

Japanese Unexamined Patent Publication No. 2001-9066

By the way, the circulation pump is connected to a pipe that distributes water and hot water. This pipe is connected to the circulation pump, for example, via a screw-in pipe joint.

Then, depending on the arrangement of the circulation pump in the housing, the hot water generator may include a circulation pump, a cross pipe for hot water supply extending to the hot water supply location, and a relay pipe for relaying the circulation pump. In such a case, the hot water generator requires a first screw-in type pipe joint that connects the circulation pump and the relay pipe, and a second screw-in type pipe joint that connects the relay pipe and the cross pipe.

When connecting the cross pipe to the second pipe joint, the force that tightens the cross pipe to the second pipe joint acts on the connection between the relay pipe and the second pipe joint, or the first pipe via the relay pipe. It acts on the connection part between the joint and the relay pipe, or acts on the connection part between the pump and the first pipe joint via the relay pipe to loosen each connection part and induce water leakage due to this loosening. There is a risk of doing so.

Therefore, an object of the present invention is to provide a hot water generator capable of connecting a migration pipe for hot water supply extending to a hot water supply location without loosening the screw-in pipe joint of the circulation pump.

The hot water generator according to the embodiment of the present invention includes a housing having a joint insertion hole, an inlet-side screw-in type pipe joint arranged inside the housing, and a pump having an outlet-side screw-in type pipe joint. , A connecting joint that is fixed to the outlet-side screw-in type pipe joint, projects to the outside of the housing through the joint insertion hole, and can connect a crossing pipe that sends hot water to a hot water supply location on the outside of the housing. , Is equipped.

The connection joint of the hot water generator according to the embodiment of the present invention has a non-circular outer shape when viewed in the direction of being fastened to the outlet side screw-in type pipe joint, and the housing has the joint insertion hole. It is preferable that the connection joint is provided with a loosening prevention portion provided on the opening edge of the joint to prevent loosening of the connection joint.

Further, the connection joint of the hot water generator according to the embodiment of the present invention has a hexagonal outer shape when viewed in the direction of being fastened to the outlet side screw-in pipe joint, and the hot water generator has the above-mentioned hot water generator. A loosening prevention member fixed to the outside of the housing and interposed between the housing and the connection joint to prevent loosening of the connection joint, and a plurality of fastenings for fixing the loosening prevention member to the housing. The housing comprises a member, and the housing has a plurality of first fixing holes arranged in a circle around the joint insertion hole, and the loosening prevention member is a hexagonal fitting into which the connection joint can be fitted. It has a joint hole and a plurality of second fixing holes arranged in a circle around the fitting hole and having an elongated hole shape along the circle, and the plurality of fastening members are formed with the first fixing hole. The number of the first fixing holes is larger than the number of the second fixing holes, and the number of the first fixing holes and the number of the second fixing holes are continuous. The opening range of the plurality of second fixing holes in the direction along the circle, which is an even number or a continuous multiple of 3, is 360 degrees from the second angle obtained by dividing 360 degrees by the number of the second fixing holes. It is preferably larger than the angle range obtained by subtracting the first angle divided by the number of the first fixing holes.

According to the present invention, it is possible to provide a hot water generator capable of connecting a migration pipe for hot water supply extending to a hot water supply location without loosening the screw-in pipe joint of the circulation pump.

The system block diagram of the hot water generator which concerns on embodiment of this invention. The perspective view of the water heat exchange unit of the hot water generator which concerns on this embodiment. It is an exploded perspective view of the water heat exchange unit of the hot water generator which concerns on this embodiment. The perspective view of the internal structure of the hot water generator which concerns on this embodiment. The front view of the internal structure of the hot water generator which concerns on this embodiment. The front view of the loosening prevention structure of the pipe connection joint of the hot water generator which concerns on this embodiment. The perspective view of the loosening prevention structure of the pipe connection joint of the hot water generator which concerns on this embodiment. The perspective view of another example of the loosening prevention structure of the pipe connection joint of the hot water generator which concerns on this embodiment. The bottom view of another example of the loosening prevention structure of the pipe connection joint of the hot water generator which concerns on this embodiment. The bottom view of another example of the loosening prevention structure of the pipe connection joint of the hot water generator which concerns on this embodiment. The bottom view of another example of the loosening prevention structure of the pipe connection joint of the hot water generator which concerns on this embodiment. The bottom view of another example of the loosening prevention structure of the pipe connection joint of the hot water generator which concerns on this embodiment. The bottom view of another example of the loosening prevention structure of the pipe connection joint of the hot water generator which concerns on this embodiment. The bottom view of another example of the loosening prevention structure of the pipe connection joint of the hot water generator which concerns on this embodiment. The bottom view of another example of the loosening prevention structure of the pipe connection joint of the hot water generator which concerns on this embodiment. FIG. 3 is a perspective view of a fixed structure of another pipe connection joint of the hot water generator according to the present embodiment. It is an exploded perspective view of the fixed structure of another pipe connection joint of the hot water generator which concerns on this embodiment.

An embodiment of the hot water generator according to the present invention will be described with reference to FIGS. 1 to 11. In the plurality of drawings, the same or corresponding configurations are designated by the same reference numerals.

FIG. 1 is a system configuration diagram of a hot water generator according to an embodiment of the present invention.

As shown in FIG. 1, the hot water generator 1 according to the present embodiment is a heat pump type. The hot water generator 1 is an outdoor unit 2 (Outdoor Unit), which is a heat source unit that exchanges heat between outdoor air and a refrigerant, and a water heat exchange unit 3 (Hydro) that exchanges heat between water supplied from the outside of the machine and a refrigerant. Unit), a remote controller 4 as an input device that accepts operations by the user, and a control unit 5 that controls the outdoor unit 2 and the water heat exchange unit 3 based on the operations input to the remote controller 4. There is.

The hot water generator 1 circulates a refrigerant between the outdoor unit 2 and the water heat exchange unit 3, and heats the water by exchanging heat between the refrigerant and water in the water heat exchanger 15 in the water heat exchange unit 3. The first temperature, for example, 40 degrees Celsius, is supplied to the outside of the machine. The hot water at the first temperature circulates through an external heating device (not shown), for example, a floor heating system, and is returned to the water heat exchange unit 3. That is, water circulates between the water heat exchange unit 3 and an external heat radiating device such as a heat radiating device of the heating device.

Further, the hot water generator 1 may supply hot water having a second temperature, for example, about 70 degrees Celsius, to the outside of the machine by using heat exchange between the refrigerant and water and heating by the backup heater 67 described later in combination. can. When only heat exchange between the refrigerant and water is used, it depends on the type of the refrigerant used, but when the R410A refrigerant is used, the maximum temperature is about 55 degrees Celsius. The hot water of the second temperature is stored and used in a hot water storage device outside the machine. The hot water stored in the hot water storage device is supplied to, for example, a washroom, a kitchen, and a bathroom. Normally, the outdoor unit 2 is installed outdoors, and the water heat exchange unit 3 is installed indoors. The outdoor unit 2 and the water heat exchange unit 3 are connected by

refrigerant pipes

21 and 22 and a communication line (not shown). As described above, in the hot water generator 1, since the water pipe is not laid outdoors, the water does not freeze in the water pipe at the low temperature in winter.

There is at least one remote controller 4, which includes, for example, a remote controller 4 provided in the water heat exchange unit 3 and a remote controller (not shown) installed indoors, for example, on a wall surface.

The hot water generator 1 includes a freezing circuit 10. The freezing circuit 10 heats water into hot water by transferring heat from a low temperature portion to a high temperature portion using outdoor air as a heat source.

The refrigeration circuit 10 includes a compressor 11, an air heat exchanger 12 as an evaporator, an expansion valve 13, a water heat exchanger 15 as a condenser, a compressor 11, an air heat exchanger 12, and an expansion valve 13. , And a refrigerant pipe 16 that connects the water heat exchanger 15 and allows the refrigerant to flow. The refrigeration circuit 10 transfers heat from the air heat exchanger 12 to the water heat exchanger 15 and heats water into hot water in the water heat exchanger 15.

Further, the refrigeration circuit 10 sends the refrigerant discharged from the compressor 11 to either the air heat exchanger 12 or the water heat exchanger 15, and sends the air heat exchanger 12 or the water heat exchanger 15 to the other. It includes a four-way valve 17 that sends the passed refrigerant to the compressor 11 again, and an accumulator 18 provided in the refrigerant pipe 16 between the four-way valve 17 and the compressor 11.

The water heat exchanger 15 is housed in the water heat exchange unit 3. Other components of the refrigeration circuit 10 are housed in the outdoor unit 2.

The air heat exchanger 12 functions as an evaporator (also referred to as a “heat absorber”) when the refrigeration circuit 10 heats water, and the water heat exchanger 15 is a condenser (also referred to as a “radiator”). .) Functions.

The compressor 11 compresses the refrigerant, boosts the pressure, and discharges the refrigerant. The operating frequency of the compressor 11 can be changed by known inverter control. Increasing the rotation speed of the compressor 11 increases the amount of heat transferred to the high temperature portion, and decreasing the rotation speed decreases the amount of heat transferred to the high temperature portion. Further, by increasing the rotation speed of the compressor 11, the power consumption of the compressor 11 also increases.

The expansion valve 13 is, for example, an electronic expansion valve (Pulse Motor Valve, PMV). The expansion valve 13 can adjust the valve opening degree. Although not shown, the expansion valve 13 includes, for example, a valve body having a through hole, a needle capable of advancing and retreating with respect to the through hole, and a power source for advancing and retreating the needle. When the through hole is closed with a needle, the expansion valve 13 stops (cuts off) the flow of the refrigerant in the refrigerating circuit 10. At this time, the expansion valve 13 is in the closed state, and the opening degree of the expansion valve 13 is the smallest. When the needle is farthest from the through hole, the flow amount of the refrigerant in the refrigeration circuit 10 is maximized. At this time, the opening degree of the expansion valve 13 is the largest.

The power source of the expansion valve 13 is, for example, a stepping motor. The rotation of the stepping motor causes the needle to move back and forth, changing the distance from the through hole and changing the opening.

The refrigerant pipe 16 connects the compressor 11, the accumulator 18, the four-way valve 17, the air heat exchanger 12, the expansion valve 13, and the water heat exchanger 15. The refrigerant pipe 16 includes a first refrigerant pipe 16a that connects the discharge side of the compressor 11 and the four-way valve 17, a second refrigerant pipe 16b that connects the suction side of the compressor 11 and the four-way valve 17, and the four-way valve 17 and water. A third refrigerant pipe 16c connecting the heat exchanger 15, a fourth refrigerant pipe 16d connecting the air heat exchanger 12 and the water heat exchanger 15, and a fifth refrigerant connecting the air heat exchanger 12 and the four-way valve 17. Includes tube 16e and.

The second refrigerant pipe 16b is provided with an accumulator 18. The fourth refrigerant pipe 16d is provided with an expansion valve 13.

The four-way valve 17 switches the direction of the refrigerant flow in the refrigerant pipe 16. When the water is heated to hot water in the refrigerating circuit 10, the four-way valve 17 allows the refrigerant to flow from the first refrigerant pipe 16a to the third refrigerant pipe 16c, and the refrigerant from the fifth refrigerant pipe 16e to the second refrigerant pipe 16b. (The flow of the refrigerant shown by the solid line in FIG. 1).

When the water is heated to hot water, the hot water generator 1 discharges the compressed high-temperature and high-pressure refrigerant from the compressor 11 and sends this refrigerant to the water heat exchanger 15 via the four-way valve 17. The water heat exchanger 15 causes heat exchange between the water passing through the water heat exchanger 15 and the refrigerant passing through the water heat exchanger 15. Then, the water is heated, the refrigerant is cooled, and a high-pressure liquid state is obtained. That is, when the water is heated to hot water, the water heat exchanger 15 functions as a radiator. The refrigerant that has passed through the water heat exchanger 15 passes through the expansion valve 13 and is depressurized to become a low-pressure gas-liquid two-phase refrigerant that reaches the air heat exchanger 12. The air heat exchanger 12 cools the outdoor air by exchanging heat between the outdoor air and the refrigerant passing through the air heat exchanger 12. At this time, the air heat exchanger 12 functions as a heat absorber that evaporates the refrigerant to make it in a gaseous state. The refrigerant that has passed through the air heat exchanger 12 is sucked into the compressor 11.

The refrigerating circuit 10 can be defrosted by switching the direction of the refrigerant flow in the refrigerant pipe 16 by the four-way valve 17. When the defrosting operation is performed, the hot water generator 1 inverts the four-way valve 17 to generate a flow of the refrigerant in the refrigerating circuit 10 in the opposite direction to the flow of the refrigerant for heating the water into hot water. In the case of the defrosting operation, the four-way valve 17 circulates the refrigerant from the first refrigerant pipe 16a to the fifth refrigerant pipe 16e, and circulates the refrigerant from the third refrigerant pipe 16c to the second refrigerant pipe 16b (FIG. 1). Refrigerant flow shown by broken lines in the middle). In the case of defrosting operation, the air heat exchanger 12 functions as a condenser, and the water heat exchanger 15 functions as an evaporator.

Further, the refrigeration circuit 10 may be dedicated to heating water without a four-way valve 17. In this case, the discharge side of the compressor 11 is connected to the water heat exchanger 15 through the refrigerant pipe 16, and the suction side of the compressor 11 is connected to the air heat exchanger 12 through the refrigerant pipe 16.

Next, the water heat exchange unit 3 guides the water heat exchanger 15 of the refrigeration circuit 10, the expansion tank 31 (Expansion vessel), and the water before being heated to the water heat exchanger 15 from outside the water heat exchange unit 3. The water guide pipe 32, the hot water guide pipe 33 that guides the hot water heated by the water heat exchanger 15 to the expansion tank 31, and the hot water supply that supplies the hot water heated by the water heat exchanger 15 to the outside of the water heat exchange unit 3. A pipe 35, a backup heater 67 provided in the hot water supply pipe 35 to heat the hot water sent from the expansion tank 31 to the outside of the water heat exchange unit 3 to a higher temperature, and a backup heater 67 provided in the hot water supply pipe 35 to exchange water heat from the expansion tank 31. It includes a pump 36 that sends hot water to the outside of the unit 3.

The water heat exchange unit 3 may be used for circulating hot water between the water heat exchange unit 3 and a device outside the water heat exchange unit 3, or outside the water heat exchange unit 3. It may be used for heating water into hot water and supplying the hot water to the outside of the water heat exchange unit 3. The device outside the water heat exchange unit 3 is, for example, a heating device (not shown) or a hot water storage device (not shown) that heats water with circulating hot water and stores the water warmed by the hot water.

Further, the water heat exchange unit 3 includes a refrigerant pipe connection joint 25, 26 for connecting the

cross pipes

21 and 22 of the refrigerant pipe 16 to the refrigerant pipe 16 in the water heat exchange unit 3, and a water pipe outside the water heat exchange unit 3. It includes a water guide pipe connecting joint 46 that connects 45 to the water conducting pipe 32, and a hot water supply pipe connecting joint 48 that connects the hot water pipe 47 outside the water heat exchange unit 3 to the hot water supply pipe 35. These connecting

joints

25, 26, 46, 48 are screw type pipe joints.

The

crossover pipes

21 and 22 of the refrigerant pipe 16 allow the refrigerant to flow between the outdoor unit 2 and the water heat exchange unit 3. The crossover pipe 21 is a part of the third refrigerant pipe 16c and is laid on the outside of the outdoor unit 2 and the outside of the water heat exchange unit 3. The crossover pipe 22 is a part of the fourth refrigerant pipe 16d, and is laid outside the outdoor unit 2 and outside the water heat exchange unit 3. The portion of the third refrigerant pipe 16c that is provided in the water heat exchange unit 3 and connects the refrigerant pipe connection joint 25 and the water heat exchanger 15 is the refrigerant pipe in the first water heat exchange unit. Call it 27. Further, a portion of the fourth refrigerant pipe 16d, which is provided in the water heat exchange unit 3 and connects the refrigerant pipe connection joint 26 and the water heat exchanger 15, is a part of the refrigerant pipe in the second water heat exchange unit. Call it 28.

The hot water pipe 47 is a cross pipe connecting the water heat exchange unit 3 and the hot water supply point, and the water pipe 45 is a cross pipe connecting the water heat exchange unit 3 and the water supply point. In the case of the circulation type, the hot water supply point and the water supply point are connected.

The hot water guide pipe 33 connects the downstream of the backup heater 67 of the hot water supply pipe 35 and the upstream of the pump 36 to the expansion tank 31. The hot water guide pipe 33 guides the warmed and expanded hot water in the hot water supply pipe 35 to the expansion tank 31. The expansion tank 31 has a function of absorbing the expansion (increase in volume) of the warmed hot water.

The hot water heated in the water heat exchanger 15 by the refrigerant circulating in the refrigeration circuit 10 is sucked into the hot water supply pipe 35 by the driving pump 36 and sent to the hot water supply location through the hot water pipe 47 outside the water heat exchange unit 3. ..

FIG. 2 is a perspective view of the water heat exchange unit 3 as viewed diagonally from the front and lower right. FIG. 3 is an exploded perspective view of the water heat exchange unit 3 as viewed diagonally to the right from above.

As shown in FIGS. 2 and 3, the water heat exchange unit 3 of the hot water generator 1 according to the present embodiment includes a vertically long rectangular housing 51.

The housing 51 has a front surface 51f, a back surface 51r, a top surface 51t, a bottom surface 51b, and a pair of side surfaces 51s. Further, the housing 51 includes a front plate 52 that covers the front surface 51f, a back plate 53 that covers the back surface 51r, a top surface plate 54 that covers the top surface 51t, a bottom surface plate 55 that covers the bottom surface 51b, and a pair of sides that cover each side surface 51s. The

face plates

56 and 57 are provided.

The housing 51 includes an expansion tank 31, a water guide pipe 32, a hot water guide pipe 33, a hot water supply pipe 35, a pump 36, a water heat exchanger 15 of a refrigeration circuit 10, a refrigerant pipe 27 in a first water heat exchange unit, and a second water. It houses the refrigerant pipe 28 in the heat exchange unit.

Further, the housing 51 houses a control unit storage box 61 that houses the control unit 5 and a control unit support plate 62 that supports the control unit storage box 61 in the housing 51. The control unit storage box 61 is a box body that opens toward the front of the housing 51. A substrate on which the control unit 5 is mounted is supported in the control unit storage box 61.

The front plate 52 has an operation window 63 on which the remote controller 4 is arranged. On the back side of the front plate 52, a controller support plate 65 that supports the remote controller 4 arranged in the operation window 63 is provided. The controller support plate 65 has a function of a lid that covers the control unit storage box 61.

The front plate 52, the back plate 53, the top plate 54, the bottom plate 55, the

side plates

56 and 57, the control unit storage box 61, the control unit support plate 62, and the controller support plate 65 are sheet metal processed products.

The water guide pipe 32, the hot water guide pipe 33, the hot water supply pipe 35, the pump 36, the water heat exchanger 15 of the refrigeration circuit 10, the refrigerant pipe 27 in the first water heat exchange unit, and the refrigerant pipe 28 in the second water heat exchange unit are It is arranged in a space sandwiched between the back plate 53 and the control unit support plate 62. The expansion tank 31 is located above the control unit support plate 62 and is arranged in a space sandwiched between the front plate 52 and the back plate 53.

As shown in FIGS. 2 to 5, the back plate 53 of the housing 51 of the hot water generator 1 according to the present embodiment supports the expansion tank 31 and the water heat exchanger 15 of the freezing circuit 10.

The expansion tank 31 has a cylindrical shape, and the length dimension L in the center line C direction is larger than the diameter dimension D. Further, the expansion tank 31 is housed in the housing 51 with the center line C facing in the direction of the pair of side surfaces 51s. That is, the length dimension L of the expansion tank 31 is smaller than the width dimension of the housing 51. Further, the diameter dimension D of the expansion tank 31 is smaller than the height dimension and the depth dimension of the housing 51. The expansion tank 31 is arranged at the uppermost part in the housing 51. The expansion tank 31 includes a cylindrical body portion 31a and a pair of

end plates

31b and 31c that close both ends of the body portion 31a. The expansion tank 31 is fixed to the back plate 53 by a saddle-shaped tank fixing band 66 straddling the body portion 31a. The tank fixing band 66 fixes the expansion tank 31 to the back plate 53 like a saddle band used for fixing the pipe. That is, the tank fixing band 66 straddles the body portion 31a from above to below the body portion 31a and fixes the expansion tank 31 to the back plate 53 of the housing 51.

The water guide pipe 32, the hot water guide pipe 33, the hot water supply pipe 35, the pump 36, the water heat exchanger 15 of the refrigeration circuit 10, the refrigerant pipe 27 in the first water heat exchange unit, and the refrigerant pipe 28 in the second water heat exchange unit are It is arranged below the expansion tank 31.

The water heat exchanger 15 is arranged directly below the expansion tank 31 and in the vicinity of the side plate 56 on either the left or right side (the left side in this case) of the housing 51. A backup heater 67 is arranged directly below the expansion tank 31 and in the vicinity of the side plate 57 on either the left or right side (right side in this case) of the housing 51. The heater 67 is fixed to the back plate 53. The heater 67 assists the heating of water in a situation where the outside air temperature is extremely low and it is difficult for the freezing circuit 10 to heat the water into hot water, or the hot water heated by the freezing circuit 10 is heated to a higher temperature hot water. It is used to do.

The pump 36 is arranged below the expansion tank 31 and directly in front of the heater 67 and on the bottom plate 55 of the housing 51. A hot water supply pipe connecting joint 48 is provided directly below the pump 36. The hot water supply pipe connection joint 48 projects to the outside of the housing 51. The hot water supply pipe connecting joint 48 projects downward from the bottom plate 55 and is exposed to the outside of the housing 51.

A water pipe connecting joint 46 is provided diagonally to the left of the hot water supply pipe connecting joint 48. The water pipe 32 connected to the water pipe connecting joint 46 bends toward the water heat exchanger 15 at a portion that enters the back side of the housing 51 from the bottom plate 55 of the housing 51, and bottoms in the vicinity of the bottom plate 55. It extends parallel to the face plate 55 and is connected to the back side of the lower end portion of the right side surface of the water heat exchanger 15. A hot water supply pipe 35 is connected to the back side of the upper end portion of the right side surface of the water heat exchanger 15. The hot water supply pipe 35 bends from the water heat exchanger 15 toward the side plate 57 of the housing 51, bends toward the bottom plate 55 of the housing 51 at an intermediate position between the water heat exchanger 15 and the heater 67, and hangs directly below. A portion that reaches the vicinity of the lower end portion of the heater 67 extends parallel to the bottom plate 55 and is connected to the lower end portion of the left side surface of the heater 67. The hot water guide pipe 33 branches from the hot water supply pipe 35 through a cross-shaped branch at the upper end of the front surface of the heater 67, rises toward the top plate 54 of the housing 51, and rises toward the top plate 54 of the housing 51, and the center line C of the expansion tank 31. It reaches substantially the same height as the above, and is connected to the end plate 31b on the left side of the expansion tank 31 by bypassing the front surface of the expansion tank 31.

The hot water supply pipe 35 extends downward from the cross-shaped (cross-shaped) branch and reaches the pump 36. That is, the pump 36 is connected to the outlet end of the hot water supply pipe 35.

The refrigerant pipe 27 in the first water heat exchange unit and the refrigerant pipe 28 in the second water heat exchange unit enter the housing 51 through the refrigerant pipe insertion hole 71 provided in the bottom plate 55 of the housing 51.

The refrigerant pipe 27 in the first water heat exchange unit extends on the right side of the water heat exchanger 15 toward the expansion tank 31, and the water heat exchanger 15 is located near the upper end portion of the right side surface of the water heat exchanger 15. It bends toward and is connected to the water heat exchanger 15. The refrigerant pipe 27 in the first water heat exchange unit rises and extends substantially directly in front of the hanging portion of the hot water supply pipe 35. The refrigerant pipe connecting joint 25 is provided at the end of the refrigerant pipe 27 in the first water heat exchange unit arranged outside the housing 51.

The refrigerant pipe 28 in the second water heat exchange unit rises closer to the water heat exchanger 15 than the refrigerant pipe 27 in the first water heat exchange unit in parallel with the refrigerant pipe 27 in the first water heat exchange unit to generate water heat. It bends toward the water heat exchanger 15 near the lower end of the right side of the exchanger 15 and is connected to the water heat exchanger 15. The refrigerant pipe connecting joint 26 is provided at the end of the refrigerant pipe 28 in the second water heat exchange unit arranged outside the housing 51.

Next, the loosening prevention structure of the hot water supply pipe connection joint 48 will be described.

As shown in FIGS. 6 and 7, the pump 36 of the hot water generator 1 according to the present embodiment includes a pump inlet pipe joint 72 and a pump outlet pipe joint 73. The pump inlet pipe joint 72 and the pump outlet pipe joint 73 are screw-in type pipe joints. The pump inlet pipe joint 72 and the pump outlet pipe joint 73 are integrated with the housing 75 of the pump 36. Further, the pump inlet pipe joint 72 and the pump outlet pipe joint 73 are arranged substantially in a straight line with the housing 75 in between. The pump 36 is housed in the housing 51 with the pump inlet pipe joint 72 facing upward and the pump outlet pipe joint 73 facing downward.

A hot water supply pipe connection joint 48 for connecting the hot water pipe 47 outside the water heat exchange unit 3 to the pump 36 is fastened to the pump outlet pipe joint 73. Further, a second hot water supply pipe connecting joint 76 for connecting the hot water supply pipe 35 to the pump 36 is fastened to the pump inlet pipe joint 72.

The housing 51 has a joint insertion hole 77 for projecting the hot water supply pipe connection joint 48 fixed to the pump outlet pipe joint 73 to the outside of the housing 51. The joint insertion hole 77 is provided in the bottom plate 55 of the housing 51.

The hot water supply pipe connection joint 48 is an adapter for connecting the hot water pipe 47 outside the water heat exchange unit 3 to the pump outlet pipe joint 73 of the pump 36. The hot water supply pipe connection joint 48 is fixed to the pump outlet pipe joint 73 and is arranged outside the housing 51 via the joint insertion hole 77 of the housing 51. The hot water supply pipe connection joint 48 is connected to the hot water pipe 47 on the outside of the housing 51. The hot water supply pipe connection joint 48 has a non-circular outer shape when viewed in the direction of being fastened to the pump outlet pipe joint 73. For example, the hot water supply pipe connecting joint 48 has a hexagon nut-shaped outer shape portion 48a.

The housing 51 is provided with a loosening prevention portion 81 provided at the opening edge of the joint insertion hole 77 to prevent the hot water supply pipe connecting joint 48 fixed to the pump outlet pipe joint 73 from loosening.

The loosening prevention portion 81 includes a plurality of loosening prevention pieces 82 that project from the opening edge of the joint insertion hole 77 to the outside of the housing 51 and prevent the hot water supply pipe connecting joint 48 fixed to the pump outlet pipe joint 73 from loosening. There is. Each loosening prevention piece 82 is provided on each of the six side portions of the joint insertion hole 77 having a shape suitable for the outer shape portion 48a of the hot water supply pipe connection joint 48, that is, the hexagonal hole-shaped joint insertion hole 77. Each loosening prevention piece 82 is a cut-up formed by bending a plate material of a material when a joint insertion hole 77 is formed in a bottom plate 55 which is a processed sheet metal product.

When the hot water pipe 47 outside the water heat exchange unit 3 is connected to the hot water supply pipe connection joint 48, a force for tightening the hot water pipe 47 to the hot water supply pipe connection joint 48 acts on the hot water supply pipe connection joint 48. This force acts in the direction of twisting the hot water supply pipe connection joint 48. Then, when there is no loosening prevention portion 81, this force acts on the connection portion between the pump outlet pipe joint 73 and the hot water supply pipe connection joint 48, and causes the hot water supply pipe connection joint 48 fastened to the pump outlet pipe joint 73. It may loosen. Therefore, the loosening prevention unit 81 supports the force for tightening the hot water pipe 47 to the hot water supply pipe connection joint 48 by the housing 51 to prevent the hot water supply pipe connection joint 48 fastened to the pump outlet pipe joint 73 from loosening. ..

As shown in FIGS. 8 to 9G, the hot water generator 1 according to the present embodiment is fixed to the outside of the housing 51 and is interposed between the housing 51 and the hot water supply pipe connecting joint 48 to provide a pump outlet pipe. A loosening prevention member 85 for preventing loosening of the hot water supply pipe connecting joint 48 to be fastened to the joint 73, and a plurality of fastening members 86 for fixing the loosening prevention member 85 to the housing 51 are provided.

Then, the housing 51 has a plurality of first fixing holes 87 arranged in the circular C1 centering on the joint insertion hole 77.

The loosening prevention member 85 has a hexagonal fitting hole 88 into which the outer shape portion 48a of the hot water supply pipe connection joint 48 can be fitted, and an elongated hole shape arranged in a circular C2 centered on the fitting hole 88 and along the circular C2. It has a plurality of second fixing holes 89 and.

The plurality of first fixing holes 87 are evenly arranged in the circular C1. The plurality of second fixing holes 89 are evenly arranged in the circular C2.

Further, the number N1 of the first fixing holes 87 is larger than the number N2 of the second fixing holes 89.

[Number 1]
(Number of first fixing holes 87 N1)> (Number of second fixing holes 89 N2)

Further, the number N1 of the first fixing holes 87 and the number N2 of the second fixing holes 89 are set to continuous even numbers or consecutive multiples of 3. When the combination of the number N1 of the first fixing holes 87 and the number N2 of the second fixing holes 89 is expressed as (N1, N2), the combination is, for example, (10, 8), (12, It is set as 10), (14, 12), (12, 9), (15, 12).

The opening range θr of the plurality of second fixing holes 89 in the direction along the circular C2 is 360 degrees divided by the number N2 of the second fixing holes 89, and the second angle θ2 to 360 degrees is the number of the first fixing holes 87. It is larger than the angle range obtained by subtracting the first angle θ1 divided by N1.

[Number 2]
(First angle θ1) = (360 degrees) ÷ (Number of first fixing holes N1)
(Second angle θ2) = (360 degrees) ÷ (Number of second fixing holes N2)
(Aperture range θr)> (Second angle θ2)-(First angle θ1)

The first angle θ1 represents the arrangement interval of the plurality of first fixing holes 87, that is, the pitch, and the second angle θ2 represents the arrangement interval of the plurality of second fixing holes 89, that is, the pitch. It is a representation.

From the viewpoint of preventing the hot water supply pipe connection joint 48 from loosening, the opening dimension of the second fixing hole 89 in the direction along the circular C2, that is, the length of the second fixing hole 89 which is a long hole in the longitudinal direction is too large. It is preferable that there is no such thing. Therefore, the opening range θr and the diameter dimension of the circular C2 are appropriately set.

9A to 9G show the relationship between the first fixing hole 87 and the second fixing hole 89 as described above, and the number N1 of the first fixing hole 87 and the number N2 of the second fixing hole 89. It is a figure which showed the case where the combination of is set to (12, 9). In this case, the first angle θ1 is 30 degrees and the second angle θ2 is 40 degrees. Therefore, the aperture range θr is greater than 10 degrees. The opening range θr is such that the fastening member 86 is inserted into the first fixing hole 87 of the housing 51 and the loosening prevention member 85 is in a calculated range ((second angle θ2) − (first angle θ1)) in a loosened state. ) May be movable, and the thickness of the fastening member 86 may be added to this calculated range.

Assuming that FIG. 9A is the reference position of the tightening position of the hot water supply pipe connecting joint 48, that is, the 0 degree position, FIGS. 9B to 9G show a state in which the tightening position of the hot water supply pipe connecting joint 48 is different by 5 degrees. That is, FIG. 9A shows a 0 degree tightening position, FIG. 9B shows a 5 degree tightening position, FIG. 9C shows a 10 degree tightening position, FIG. 9D shows a 15 degree tightening position, and FIG. 9E shows. A tightening position of 20 degrees, FIG. 9F shows a tightening position of 25 degrees, and FIG. 9G shows a tightening position of 30 degrees.

Then, in any of the tightening states of FIGS. 9A to 9G, there are three combinations of the first fixing hole 87 and the second fixing hole 89 that overlap the fastening member 86 so that the fastening member 86 can be tightened. Since the hot water supply pipe connecting joint 48 having the hexagon nut-shaped outer shape portion 48a is in the same tightening state every 30 degrees, the loosening prevention member 85 can always be fixed to the housing 51 by three fastening members 86. can. The loosening prevention member 85 may be fixed to the housing 51 by two fastening members 86. When the number N1 of the first fixing holes 87 and the number N2 of the second fixing holes 89 are set to continuous even numbers, the loosening prevention member 85 is always fixed to the housing 51 by two fastening members 86. can do. Therefore, the loosening prevention member 85 supports the force for tightening the hot water pipe 47 to the hot water supply pipe connection joint 48 in cooperation with the housing 51, and the hot water supply pipe connection joint 48 fastened to the pump outlet pipe joint 73 Prevent it from loosening.

The fitting hole 88 of the loosening prevention member 85 may be provided with the loosening prevention piece 82 as shown in FIGS. 6 and 7.

In addition to FIG. 6, as shown in FIGS. 10 to 11, the hot water supply pipe 35 of the hot water generator 1 according to the present embodiment includes a hot water supply pipe outlet pipe joint 91. The hot water supply pipe outlet pipe joint 91 is a plug-in type pipe joint. The hot water supply pipe outlet pipe joint 91 is provided at the connection end of the hot water supply pipe 35. The hot water supply pipe outlet pipe joint 91 is an adapter for connecting the hot water supply pipe 35 to the second hot water supply pipe connection joint 76. The hot water supply pipe outlet pipe joint 91 is fitted to the second hot water supply pipe connection joint 76. A sealing material 92, for example, an O-ring is sandwiched between the hot water supply pipe outlet pipe joint 91 and the second hot water supply pipe connection joint 76. The hot water supply pipe outlet pipe joint 91 includes a first fixing flange 95.

The second hot water supply pipe connection joint 76 is an adapter for connecting the hot water supply pipe 35 to the pump inlet pipe joint 72 of the pump 36. The second hot water supply pipe connection joint 76 is a screw-in type pipe joint that can be connected to the pump inlet pipe joint 72 of the pump 36, and is also a plug-in type pipe joint that can be connected to the hot water supply pipe outlet pipe joint 91 of the hot water supply pipe 35. The second hot water supply pipe connecting joint 76 includes a second fixing flange 96.

When the hot water supply pipe outlet pipe joint 91 is inserted into the second hot water supply pipe connection joint 76, the first fixing flange 95 and the second fixing flange 96 come into surface contact with each other and are aligned.

Then, the hot water supply pipe outlet pipe joint 91 and the second hot water supply pipe connection joint 76 are connected by the fixture 97 and fixed to the housing 51. The fixture 97 fixes the hot water supply pipe outlet pipe joint 91 and the second hot water supply pipe connection joint 76 to the housing 51 via the backup heater 67 fixed to the housing 51. The fixture 97 may be directly fixed to the housing 51.

The fixture 97 is a saddle-shaped saddle that straddles the hot water supply pipe outlet pipe joint 91 and the second hot water supply pipe connection joint 76 in a direction orthogonal to the insertion direction of the hot water supply pipe outlet pipe joint 91 and the second hot water supply pipe connection joint 76. It is a band (Saddle band). The fixture 97 collectively holds the first fixing flange 95 and the second fixing flange 96 to connect the plug-in type pipe joint. Both ends of the fixture 97 are fixed to the backup heater 67 by fastening members 98, such as screws.

Then, the diameter D1 of the first fixing flange 95 (the widest dimension in the polygon) and the diameter D2 of the second fixing flange 96 are larger than the height H of the arch of the fixture 97. The diameter D1 of the first fixing flange 95 and the diameter D2 of the second fixing flange 96 may be larger than the width W of the arch of the fixture 97. The diameter D1 of the first fixing flange 95 and the diameter D2 of the second fixing flange 96 may be larger than the height H of the arch of the fixture 97 and larger than the width W of the arch. That is, these magnitude relations need only satisfy either one or both of [Equation 3] and [Equation 4].

[Number 3]
(Diameter D1 of the first fixing flange 95)> (Arch height H of the fixture 97) ∩ (Diameter D2 of the second fixing flange 96)> (Arch height H of the fixture 97)

[Number 4]
(Diameter D1 of the first fixing flange 95)> (Arch width W of the fixture 97) ∩ (Diameter D2 of the second fixing flange 96)> (Arch width W of the fixture 97)

Further, the fixture 97 has a narrow gap 99 into which the first fixing flange 95 of the hot water supply pipe outlet pipe joint 91 and the second fixing flange 96 of the second hot water supply pipe connection joint 76 are collectively inserted. The width S of the narrow gap 99 is wider than the sum of the thickness T1 of the first fixing flange 95 and the thickness T2 of the second fixing flange 96, and the first fixing flange 95 and the second fixing flange 96. While the hot water supply pipe outlet pipe joint 91 and the second hot water supply pipe connection joint 76 can be easily inserted, the hot water supply pipe outlet pipe joint 91 and the second hot water supply pipe connection joint 76 can be securely inserted. It is preferable that the narrowness does not allow water to leak from the connecting portion of the.

Therefore, the fixture 97 connects the first fixing flange 95 of the hot water supply pipe outlet pipe joint 91 and the second fixing flange 96 of the second hot water supply pipe connection joint 76, and supports the pump 36 to the housing 51. Is possible. Such a fixture 97 includes a member that connects the first fixing flange 95 of the hot water supply pipe outlet pipe joint 91 and the second fixing flange 96 of the second hot water supply pipe connection joint 76, and the pump 36 in the housing 51. Compared with the case where the supporting member and the supporting member are used separately, the number of parts can be reduced, the weight of the water heat exchange unit 3 can be reduced, and the cost can be reduced.

The fixture 97 may be a rectangular saddle shape shown in FIGS. 10 and 11, a triangular saddle shape, a pentagonal or more polygonal saddle shape, or a polygonal saddle shape. It may be an arc-shaped saddle. In the polygonal saddle-shaped fixture 97, the gaps 99 are preferably provided discretely (split, discontinuous), avoiding vertices, as shown in FIGS. 10 and 11. In this case, the fixture 97 may connect the first fixing flange 95 of the hot water supply pipe outlet pipe joint 91 and the second fixing flange 96 of the second hot water supply pipe connection joint 76 and support the pump 36. The possible strength can be easily obtained.

It is preferable that the narrow gap 99 is deviated from the center of the band width of the fixing tool 97 extending in a band shape. That is, the fixture 97 has a narrow narrow continuous portion 97n extending along one side of the narrow gap 99 and a wide wide continuous portion 97w extending along the other side of the narrow gap 99. And, it is preferable to have. In the fixture 97, the narrow continuous portion 97n is arranged above the first fixing flange 95 and the second fixing flange 96, and the wide continuous portion 97w is the first fixing flange 95 and the second fixing flange 96. The first fixing flange 95 of the hot water supply pipe outlet pipe joint 91 and the second fixing flange 96 of the second hot water supply pipe connection joint 76 are connected and the pump 36 is supported while being arranged below the 96. Is preferable. The fixture 97 that supports the pump 36 in this way can more reliably support the pump 36 as compared with the case where the gap 99 is along the center of the band width of the fixture 97. Further, since the fixture 97 has the wide continuous portion 97w, the narrow gap 99 maintains the same strength as the fixture along the center of the band width of the fixture 97, and the weight of the narrow continuous portion 97n is increased. It can contribute to reduction and reduction of material cost.

The pump 36 may be supported by the housing 51 by the loosening prevention structure of the hot water supply pipe connection joint 48 fastened to the pump outlet pipe joint 73, or the second hot water supply pipe fastened to the pump inlet pipe joint 72. It may be supported by the housing 51 by the fixed structure of the connecting joint 76. The pump 36 may be supported by the housing 51 by either the loosening prevention structure of the hot water supply pipe connecting joint 48 or the fixed structure of the second hot water supply pipe connecting joint 76. The pump 36 is preferably supported by the housing 51 by the loosening prevention structure of the hot water supply pipe connection joint 48.

As described above, the hot water generator 1 according to the present embodiment is fixed to the pump outlet pipe joint 73 of the pump 36, is arranged outside the housing 51 via the joint insertion hole 77, and hot water is supplied to the hot water supply location. It is provided with a hot water supply pipe connection joint 48 to which a hot water pipe 47 can be connected. In other words, the hot water generator 1 can connect the hot water pipe 47 to the hot water supply pipe connection joint 48 which is directly fixed to the pump outlet pipe joint 73 of the pump 36. Therefore, in the hot water generator 1, when the hot water pipe 47, which is a crossing pipe, is connected to the hot water supply pipe connection joint 48, the force for tightening the hot water pipe 47 to the hot water supply pipe connection joint 48 is applied to the pump 36 and the hot water supply pipe connection joint 48. It does not act on the relay pipe, and water leakage due to loosening of the joint for connecting the relay pipe is not induced. That is, the hot water generator 1 does not require a pipe that relays the pump 36 and the hot water supply pipe connection joint 48 or a fixture that fixes the relay pipe to the housing, reduces the pressure loss of the relay pipe, and reduces the pressure loss of the relay pipe. It can contribute to the miniaturization of the body, the improvement of the commercial value due to the miniaturization, and the reduction of costs. Further, the hot water generator 1 easily limits the joint that may be loosened by the force that tightens the hot water pipe 47 to the hot water supply pipe connection joint 48 to the hot water supply pipe connection joint 48 that is fixed to the pump outlet pipe joint 73 of the pump 36. can. Even if the hot water supply pipe connection joint 48 fixed to the pump outlet pipe joint 73 of the pump 36 is loosened, the looseness can be immediately restored.

Further, the hot water generator 1 according to the present embodiment is provided at the opening edge of the joint insertion hole 77 of the housing 51, and includes a loosening prevention portion 81 for preventing the hot water supply pipe connecting joint 48 from loosening. Therefore, the hot water generator 1 supports the force for tightening the hot water pipe 47 to the hot water supply pipe connection joint 48 by the housing 51 to prevent the hot water supply pipe connection joint 48 fastened to the pump outlet pipe joint 73 from loosening. Can be done.

Further, in the hot water generator 1 according to the present embodiment, the second angle θ2 to 360 degrees obtained by dividing 360 degrees by the number N2 of the second fixing holes 89 of the loosening prevention member 85 is divided by the number N2 of the first fixing holes 87 of the housing 51. A plurality of second fixing holes 89 having an opening range α larger than the angle range obtained by subtracting the first angle θ1 divided by the number N1 are provided. Therefore, the hot water generator 1 supports the force for tightening the hot water pipe 47 to the hot water supply pipe connection joint 48 by the loosening prevention member 85 and the housing 51, and the hot water supply pipe connection joint 48 fastened to the pump outlet pipe joint 73. Can be prevented from loosening.

Therefore, according to the hot water generator 1 according to the present embodiment, the pump outlet pipe joint 73 of the pump 36 is not loosened, and water leakage due to the loosening of the pump outlet pipe joint 73 of the pump 36 is not induced, and the hot water is supplied. A hot water pipe 47 for hot water supply extending to a place can be connected.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

1 ... Hot water generator, 2 ... Outdoor unit, 3 ... Water heat exchange unit, 4 ... Remote controller, 5 ... Control unit, 10 ... Refrigeration circuit, 11 ... Compressor, 12 ... Air heat exchanger, 13 ... Expansion valve, 15 ... water heat exchanger, 16 ... refrigerant pipe, 32 ... water pipe, 33 ... hot water pipe, 35 ... hot water supply pipe, 36 ... pump, 45 ... water pipe, 46 ... water pipe connection joint, 47 ... hot water pipe, 48 ... hot water pipe connection joint, 51 ... housing, 51f ... front, 51r ... back, 51t ... top, 51b ... bottom, 51s ... side, 52 ... front plate, 53 ... back plate, 54 ... top plate, 55 ... bottom Face plate, 56, 57 ... Side plate, 71 ... Refrigerator pipe insertion hole, 72 ... Pump inlet pipe joint, 73 ... Pump outlet pipe joint, 75 ... Pump housing, 76 ... Second hot water pipe connection joint, 77 ... Joint insertion hole , 81 ... Loosening prevention part, 82 ... Loosening prevention piece, 85 ... Loosening prevention member, 86 ... Fastening member, 87 ... First fixing hole, 88 ... Fitting hole, 89 ... Second fixing hole, 91 ... Hot water pipe outlet pipe Joint, 95 ... 1st fixing flange, 96 ... 2nd fixing flange, 97 ... Fixing tool, 97n ... Narrow continuous part, 97w ... Wide continuous part, 98 ... Fastening member, 99 ... Narrow gap.

Claims

A housing with a joint insertion hole and
A pump having an inlet-side screw-in type pipe joint and an outlet-side screw-in type pipe joint arranged inside the housing.
A connection joint that is fixed to the outlet-side screw-in type pipe joint, projects to the outside of the housing through the joint insertion hole, and can connect a crossover pipe that sends hot water to a hot water supply location on the outside of the housing. A hot water generator equipped with.
The connecting joint has a non-circular outer shape when viewed in the direction of being fastened to the outlet side screw type pipe joint.
The hot water generator according to claim 1, wherein the housing is provided at the opening edge of the joint insertion hole and includes a loosening prevention portion for preventing loosening of the connection joint.
The connecting joint has a hexagonal outer shape when viewed in the direction of being fastened to the outlet side screw type pipe joint.
A loosening prevention member fixed to the outside of the housing and interposed between the housing and the connecting joint to prevent the connecting joint from loosening.
The housing is provided with a plurality of fastening members that loosen and fix the prevention member.
The housing has a plurality of first fixing holes arranged in a circle around the joint insertion hole.
The loosening prevention member includes a hexagonal fitting hole into which the connection joint can be fitted, and a plurality of second fixing holes having an elongated hole shape arranged in a circle around the fitting hole and having an elongated hole shape along the circle. Have,
The plurality of fastening members fasten the first fixing hole and the second fixing hole together.
The number of the first fixing holes is larger than the number of the second fixing holes,
The number of the first fixing holes and the number of the second fixing holes are continuous even numbers or multiples of 3 consecutive holes.
The opening range of the plurality of second fixing holes in the direction along the circle is 360 degrees divided by the number of the second fixing holes, and 360 degrees divided by the number of the first fixing holes. The hot water generator according to claim 1, which is larger than an angle range obtained by subtracting an angle.