Heat recovery device for hot and cold water unit

Abstract

The present invention relates to the technical field of hot and cold water units, and specifically to a heat recovery device for hot and cold water units, comprising a heat exchange shell, wherein a spiral heat exchange tube is arranged in the heat exchange shell, and a plurality of concentrically arranged annular covers are arranged on the outer side of one end of the spiral heat exchange tube close to the valve, a first bend is installed on the upper surface of the plurality of annular covers, a stop valve is installed on the end of the first bend away from the annular cover, a distribution pipe is installed on the end of the stop valve away from the first bend, and a second bend for connecting to the inlet end of the condenser is installed on the side of the upper surface of the plurality of annular covers away from the first bend. The present invention has the following beneficial effects: it realizes that the heat generated by the operation of the compressor is used to gradually heat up the area where the spiral heat exchange tube is installed in the heat exchange shell, so that the temperature of the part of the heat exchange shell where the spiral heat exchange tube is installed gradually decreases with the spiral heat exchange tube as the center, so that the part of the heat exchange shell where the spiral heat exchange tube is installed will not generate large thermal stress due to excessive local temperature in a short time.

Description

Technical Field

[0001] The invention relates to a heat recovery device for a hot and cold water unit, belonging to the technical field of hot and cold water units. Background Art

[0002] The hot and cold water unit is an energy-saving and efficient cooling device that obtains cooling capacity through heat exchange between water and air. It has a compressor. When the compressor is working, it will generate a large amount of heat (also known as waste heat). At present, the waste heat generated by the above-mentioned compressor when working is dissipated through a cooling water tower, that is, the compressor discharge end is connected to the condenser, and the condenser is connected and communicated with the cooling water tower. In order to facilitate the recovery and utilization of the large amount of heat generated by the compressor, a heat recovery device is installed between the compressor discharge end and the condenser. The heat recovery device includes a heat exchange shell. A spiral heat exchange tube for connecting the compressor discharge end and the condenser inlet end is installed in the heat exchange shell. After water enters the heat exchange shell, the water exchanges heat with the heat medium in the spiral heat exchange tube to achieve heating of the water, which is convenient for the utilization of the heated water and realizes heat recovery.

[0003] Because the part where the spiral heat exchange tube is connected to the compressor discharge end is directly connected to the heat exchange shell, when the high-temperature medium generated by the compressor flows through the connection part of the spiral heat exchange tube and the heat exchange shell, the temperature of the area where the spiral heat exchange tube is installed in the heat exchange shell rises significantly in a short period of time, thereby causing the thermal stress in the area where the spiral heat exchange tube is installed in the heat exchange shell to increase significantly in a short period of time, which can easily cause damage to the connection part between the heat exchange shell and the spiral heat exchange tube. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention aims to provide a heat recovery device for a hot and cold water unit to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions: a heat recovery device for a hot and cold water unit, comprising a heat exchange shell, a spiral heat exchange tube is arranged in the heat exchange shell, both ends of the spiral heat exchange tube pass through the heat exchange shell and extend to the outside of the heat exchange shell, a valve is installed at one end of the spiral heat exchange tube, and a connecting pipe for connecting to the discharge end of the compressor is installed at the end of the valve away from the spiral heat exchange tube, a drain pipe joint is installed at the lower position of one end of the heat exchange shell, the drain pipe joint extends to the upper position inside the heat exchange shell, an inlet pipe joint is installed at the lower position of the end of the heat exchange shell away from the drain pipe joint, and the spiral heat exchange tube near the valve is provided with a water inlet pipe joint. A plurality of concentrically arranged annular covers are provided on the outer side of the end, and the inner diameters of the plurality of annular covers gradually increase from the inside to the outside. The side of the annular cover facing the heat exchange shell is open, and the open end of the annular cover is in contact with the surface of the heat exchange shell. A sealing ring is provided between the annular cover and the heat exchange shell. A first bend pipe is installed on the upper surface of the plurality of annular covers, and a stop valve is installed on the end of the first bend pipe away from the annular cover. A distribution pipe is installed on the end of the stop valve away from the first bend pipe, and the upper end of the distribution pipe is connected to the connecting pipe. A second bend pipe for connecting to the inlet end of the condenser is installed on the side of the upper surface of the plurality of annular covers away from the first bend pipe, and the annular cover is connected to the heat exchange shell through a limiter.

[0006] The lockhole that is formed on the upper surface of the second rim of the second rim is formed on the upper surface of the second rim of the second rim, and the lockhole that is formed on the upper surface of the second rim of the second rim is formed on the upper surface of the second rim of the second rim.

[0007] Specifically, a circular hole aligned with the small hole is provided on the upper surface of the positioning seat, and the lower surface of the positioning seat is recessed upward to form a rectangular groove, which is connected to the circular hole. A connecting seat is inserted in the rectangular groove, and the cross-section of the connecting seat is rectangular. A screw hole aligned with the circular hole is provided on the upper surface of the connecting seat, and the lower end of the connecting screw passes through the small hole and the circular hole and is threadedly connected to the screw hole.

[0008] Specifically, a side of the upper surface of the connecting seat away from the circular hole is recessed downward to form two blind holes, and vertically arranged springs are inserted into the two blind holes.

[0009] Specifically, a connecting plate is provided on the upper side of the connecting seat, the connecting plate is arranged directly above the spring, and the upper end of the spring is connected and fixed to the connecting plate.

[0010] Specifically, the lower end of the distribution pipe is open, and the outer surface of the lower end of the distribution pipe is processed with external threads. One end of the distribution pipe processed with external threads is threadedly connected to a threaded cover.

[0011] Specifically, a buffer chamber is installed on the outer surface of the heat exchange shell near the second elbow, the end of the second elbow away from the annular cover is connected to the buffer chamber, and a branch pipe connected to the condenser inlet end is installed on the upper surface of the buffer chamber.

[0012] Specifically, a first through-hole is formed at an upper position on an outer surface of one end of the heat exchange shell close to the valve, a third through-hole is formed at a lower position on a side of the heat exchange shell away from the first through-hole, both ends of the spiral heat exchange tube respectively pass through the first through-hole and the third through-hole, a second through-hole is formed at a position where a water inlet pipe joint is installed in the heat exchange shell, one end of the water inlet pipe joint is fixed in the second through-hole, a fourth through-hole is formed at a position where a drain pipe joint is installed in the heat exchange shell, and the drain pipe joint passes through the fourth through-hole.

[0013] Beneficial effects of the present invention:

[0014] 1. Close the valve, then open the stop valves on the multiple first elbows, so that the openings of the stop valves on the multiple first elbows gradually increase in the direction close to the valves, so that the high-temperature medium discharged from the compressor flows into the independent space formed by the multiple annular covers and the heat exchange shell through the connecting pipe, the distribution pipe, and the first elbow. At this time, the amount of high-temperature medium discharged from the compressor flowing into the multiple annular covers per unit time gradually increases from the outside to the inside, so that the heat generated by the operation of the compressor is used to gradually heat up the area where the spiral heat exchange tube is installed in the heat exchange shell, so that the temperature of the part of the heat exchange shell where the spiral heat exchange tube is installed gradually decreases with the spiral heat exchange tube as the center, so that the part of the heat exchange shell where the spiral heat exchange tube is installed will not generate large thermal stress due to local excessive temperature in a short time. After the part of the heat exchange shell where the spiral heat exchange tube is installed is preheated, open the valve and close the stop valve, so that the high-temperature medium discharged from the compressor enters the heat exchange tube to exchange heat with the moisture in the heat exchange shell.

[0015] 2. Use the first support plate to connect the first pipe sleeve and the transverse plate, and use the second support plate to connect the second pipe sleeve and the transverse plate, so that the connecting screws pass through the small holes and connect with the positioning seat. At this time, the first pipe sleeve and the second pipe sleeve can press the annular cover to complete the restriction of the relative position of the annular cover and the heat exchange shell. At this time, the first support plate, the second support plate, the transverse plate and other components work together to connect multiple first bends and multiple second bends to each other, thereby improving the stability of the structure.

[0016] 3. Insert the connecting seat into the rectangular groove of the positioning seat. At this time, the screw hole and the round hole are aligned. Pass one end of the connecting screw through the small hole and the round hole and then screw it into the screw hole to complete the assembly of the connecting screw, the connecting seat and the positioning seat, and realize the connection between the connecting screw and the positioning seat. When the screw hole is damaged due to wrong threads or other reasons, the connecting seat can be replaced alone without replacing the positioning seat fixed on the heat exchange shell. On the one hand, it reduces the maintenance cost, and on the other hand, it reduces the difficulty of replacing the damaged part of the screw hole. At the same time, since part of the rod of the connecting screw is in a naked state, it provides another way to remove the connecting screw by cutting it off later.

[0017] 4. After the connecting seat is inserted into the rectangular groove, the connecting plate installed at one end of the spring fits against the inner wall of the rectangular groove. The connecting plate increases the contact range between the end of the spring and the inner wall of the rectangular groove. After the connecting screw is screwed into the screw hole, the connecting seat and the connecting plate work together to squeeze the spring, causing the spring to produce elastic deformation, thereby preventing the connecting screw from loosening at will under the action of the spring rebound force. At the same time, under the support of the spring, there is a gap between the connecting seat and the top of the rectangular groove, which is convenient for adjusting the concentricity of the annular cover and one end of the spiral heat exchange tube valve. There is no need to synchronize the depth of the two connecting screws screwed into the screw hole, which reduces the difficulty of concentric installation of the annular cover and one end of the spiral heat exchange tube valve.

[0018] 5. Use the buffer chamber to connect multiple second elbows, and install a branch pipe connected to the condenser inlet end on the buffer chamber to facilitate the connection of multiple second elbows with the condenser inlet end. At the same time, the medium flowing through the second elbow at high speed will have a lower flow rate after flowing into the buffer chamber, which plays a role in reducing noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0020] Figure 1 This is a structural schematic diagram of a heat recovery device for a hot and cold water unit of the present invention;

[0021] Figure 2 A three-dimensional diagram of a heat recovery device for a hot and cold water unit according to the present invention from another perspective;

[0022] Figure 3This is a partial cross-sectional view of a heat recovery device for a hot and cold water unit of the present invention;

[0023] Figure 4 This is a three-dimensional diagram of a spiral heat exchange tube in a heat recovery device for a hot and cold water unit of the present invention;

[0024] Figure 5 This is a schematic diagram of the assembly of a first elbow, a second elbow, and an annular cover in a heat recovery device for a hot and cold water unit of the present invention;

[0025] Figure 6 This is a schematic diagram of the assembly of a first pipe sleeve, a second pipe sleeve, a first support plate, a second support plate, and a transverse plate in a heat recovery device for a hot and cold water unit of the present invention;

[0026] Figure 7 This is a schematic diagram of the assembly of a positioning seat and a heat exchange shell in a heat recovery device for a hot and cold water unit of the present invention;

[0027] Figure 8 This is a schematic assembly diagram of a positioning seat and a heat exchange shell in a heat recovery device for a hot and cold water unit of the present invention from another perspective;

[0028] Figure 9 This is a schematic diagram of the assembly of a spring, a connecting plate and a connecting seat in a heat recovery device for a hot and cold water unit of the present invention;

[0029] In the figure: 1. heat exchange shell, 2. spiral heat exchange tube, 3. horizontal plate, 4. connecting screw, 5. positioning seat, 6. annular cover, 7. first support plate, 8. threaded cover, 9. distribution pipe, 10. connecting pipe, 11. stop valve, 12. first elbow, 13. valve, 14. second elbow, 15. branch pipe, 16. buffer chamber, 17. drain pipe joint, 18. blind hole, 19. water inlet pipe joint, 20. connecting seat, 21. first pipe sleeve, 22. small hole, 23. second support plate, 24. second pipe sleeve, 25. first through hole, 26. round hole, 27. second through hole, 28. third through hole, 29. rectangular groove, 30. fourth through hole, 31. screw hole, 32. connecting plate, 33. spring. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0031] See also Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 8The present invention provides a technical solution: a heat recovery device for a hot and cold water unit, comprising a heat exchange shell 1, wherein a spiral heat exchange tube 2 is provided in the heat exchange shell 1, both ends of the spiral heat exchange tube 2 pass through the heat exchange shell 1 and extend to the outside of the heat exchange shell 1, a valve 13 is installed at one end of the spiral heat exchange tube 2, and a connecting pipe 10 for connecting to the discharge end of the compressor is installed at the end of the valve 13 away from the spiral heat exchange tube 2, wherein a first through-hole 25 is provided at an upper position on the outer surface of the end of the heat exchange shell 1 near the valve 13, and a third through-hole 28 is provided at a lower position on a side of the heat exchange shell 1 away from the first through-hole 25, so that the two ends of the spiral heat exchange tube 2 pass through the first through-hole 25 and the third through-hole 28 respectively, completing The spiral heat exchange tube 2 is assembled with the heat exchange shell 1. A drain pipe joint 17 is installed at the lower position of one end of the heat exchange shell 1. The drain pipe joint 17 extends to the upper position inside the heat exchange shell 1. A water inlet pipe joint 19 is installed at the lower position of the end of the heat exchange shell 1 away from the drain pipe joint 17. A second through-hole 27 is provided at the position where the water inlet pipe joint 19 is installed in the heat exchange shell 1. One end of the water inlet pipe joint 19 is fixed in the second through-hole 27. A fourth through-hole 30 is provided at the position where the drain pipe joint 17 is installed in the heat exchange shell 1. The drain pipe joint 17 passes through the fourth through-hole 30. The second through-hole 27 and the fourth through-hole 30 provide space for the assembly of the water inlet pipe joint 19, the drain pipe joint 17 and the heat exchange shell 1.

[0032] See Figure 1-Figure 5 A plurality of concentrically arranged annular covers 6 are provided on the outer side of one end of the spiral heat exchange tube 2 close to the valve 13. The inner diameters of the plurality of annular covers 6 gradually increase from the inside to the outside. The side of the annular cover 6 facing the heat exchange shell 1 is open, and the open end of the annular cover 6 is in contact with the surface of the heat exchange shell 1. A sealing ring is provided between the annular cover 6 and the heat exchange shell 1. A first elbow 12 is installed on the upper surface of the plurality of annular covers 6. A stop valve 11 is installed on the end of the first elbow 12 away from the annular cover 6. A distribution pipe 9 is installed on the end of the stop valve 11 away from the first elbow 12. The upper end of the distribution pipe 9 is connected to the connecting pipe 10. The lower end of the distribution pipe 9 is open, and the outer surface of the lower end of the distribution pipe 9 is processed with an external thread. The end of the distribution pipe 9 processed with the external thread is threadedly connected to a threaded cover 8, and the threaded cover 8 realizes the sealing of the lower end of the distribution pipe 9.

[0033] See Figure 1-Figure 5, a second elbow 14 for connecting to the inlet end of the condenser is installed on the side of the upper surface of the multiple annular covers 6 away from the first elbow 12, the valve 13 is closed, and then the stop valves 11 on the multiple first elbows 12 are opened, so that the opening of the stop valves 11 on the multiple first elbows 12 gradually increases in the direction close to the valve 13, so that the high-temperature medium discharged from the compressor flows into the independent space formed by the multiple annular covers 6 and the heat exchange shell 1 through the connecting pipe 10, the distribution pipe 9, and the first elbow 12. At this time, the amount of high-temperature medium discharged from the compressor flowing into the multiple annular covers 6 per unit time gradually increases from the outside to the inside , and gradually heat up the area of ​​the heat exchange shell 1 where the spiral heat exchange tube 2 is installed by utilizing the heat generated by the operation of the compressor, so that the temperature of the part of the heat exchange shell 1 where the spiral heat exchange tube 2 is installed gradually decreases with the spiral heat exchange tube 2 as the center, so that the part of the heat exchange shell 1 where the spiral heat exchange tube 2 is installed will not generate large thermal stress due to local excessive temperature in a short period of time. After preheating the part of the heat exchange shell 1 where the spiral heat exchange tube 2 is installed, open the valve 13 and close the stop valve 11, so that the high-temperature medium discharged from the compressor enters the heat exchange tube to exchange heat with the moisture in the heat exchange shell 1.

[0034] See Figures 1-8 , both sides of the annular cover 6 are provided with horizontal plates 3 arranged parallel to each other, and the vertical parts of the multiple first elbows 12 are sleeved with first pipe sleeves 21, and the first pipe sleeves 21 are in contact with the annular cover 6. Two first support plates 7 are symmetrically fixed to the outer surface of the first pipe sleeve 21, and the two first support plates 7 on a first pipe sleeve 21 are away from the two horizontal plates 3 at one end thereof. A second pipe sleeve 24 is sleeved on the vertical parts of the multiple second elbows 14, and the second pipe sleeve 24 is in contact with the annular cover 6. Two second support plates 23 are symmetrically fixed to the outer surface of the second pipe sleeve 24, and the second support plates 23 are arranged parallel to the first support plates 7. The two second support plates 23 on a second pipe sleeve 24 are away from the second pipe sleeve 24 at one end thereof and are connected and fixed to the two horizontal plates 3 respectively. The two horizontal plates A small hole 22 is opened in the middle of the upper surface of 3, and a positioning seat 5 is provided on the lower side of each of the two horizontal plates 3. The positioning seat 5 is connected and fixed to the heat exchange shell 1. A connecting screw 4 is inserted into the small hole 22, and the lower end of the connecting screw 4 is threadedly connected to the positioning seat 5. The first support plate 7 is used to connect the first pipe sleeve 21 and the horizontal plate 3, and the second support plate 23 is used to connect the second pipe sleeve 24 and the horizontal plate 3. The connecting screw 4 passes through the small hole 22 and is connected to the positioning seat 5. At this time, the first pipe sleeve 21 and the second pipe sleeve 24 can press the annular cover 6 and complete the restriction of the relative position of the annular cover 6 and the heat exchange shell 1. At this time, the first support plate 7, the second support plate 23, the horizontal plate 3 and other components work together to connect the multiple first bends 12 and the multiple second bends 14 to each other, thereby improving the stability of the structure.

[0035] See Figures 1-9, the upper surface of the positioning seat 5 is provided with a circular hole 26 aligned with the small hole 22, and the lower surface of the positioning seat 5 is recessed upward to form a rectangular groove 29, which is connected to the circular hole 26. The connecting seat 20 is inserted into the rectangular groove 29. The cross section of the connecting seat 20 is rectangular. The upper surface of the connecting seat 20 is provided with a screw hole 31 aligned with the circular hole 26. The lower end of the connecting screw 4 passes through the small hole 22 and the circular hole 26 and is threadedly connected to the screw hole 31, so that the connecting seat 20 is inserted into the rectangular groove 29 of the positioning seat 5. At this time, the screw hole 31 is aligned with the circular hole 26, so that the connecting screw 4 One end passes through the small hole 22 and the round hole 26 and is screwed into the screw hole 31 to complete the assembly of the connecting screw 4, the connecting seat 20 and the positioning seat 5, and realize the connection between the connecting screw 4 and the positioning seat 5. When the screw hole 31 is damaged due to thread misalignment or other reasons, the connecting seat 20 can be replaced alone without replacing the positioning seat 5 fixed on the heat exchange shell 1. On the one hand, it reduces the maintenance cost, and on the other hand, it reduces the difficulty of replacing the damaged part of the screw hole 31. At the same time, since a part of the rod of the connecting screw 4 is in a bare state, it provides another way to remove the connecting screw 4 by cutting it off later.

[0036] See Figure 9 , the upper surface of the connecting seat 20 is recessed downward on one side away from the circular hole 26 to form two blind holes 18, and vertically arranged springs 33 are inserted in the two blind holes 18. A connecting plate 32 is provided on the upper side of the connecting seat 20, and the connecting plate 32 is arranged just above the spring 33. The upper end of the spring 33 is connected and fixed to the connecting plate 32. After the connecting seat 20 is inserted into the rectangular groove 29, the connecting plate 32 installed at one end of the spring 33 fits into the inner wall of the rectangular groove 29. The connecting plate 32 increases the contact range between the end of the spring 33 and the inner wall of the rectangular groove 29. After the connecting screw 4 is screwed into the screw hole 31, The connecting seat 20 and the connecting plate 32 jointly play the role of squeezing the spring 33, causing the spring 33 to produce elastic deformation, thereby preventing the connecting screw 4 from loosening at will under the action of the spring 33's rebound force. At the same time, under the support of the spring 33, there is a gap between the connecting seat 20 and the top of the rectangular groove 29, which is convenient for adjusting the concentricity of the annular cover 6 and the spiral heat exchange tube 2 mounting valve 13. There is no need to synchronize the depth of the two connecting screws 4 screwed into the screw hole 31, reducing the difficulty of concentric installation of the annular cover 6 and the spiral heat exchange tube 2 mounting valve 13.

[0037] See Figure 1 A buffer chamber 16 is installed on the side of the outer surface of the heat exchange shell 1 close to the second elbow 14. The end of the second elbow 14 away from the annular cover 6 is connected to the buffer chamber 16. A branch pipe 15 connected to the inlet end of the condenser is installed on the upper surface of the buffer chamber 16. The buffer chamber 16 is used to connect multiple second elbows 14, and the branch pipe 15 connected to the inlet end of the condenser is installed on the buffer chamber 16, which facilitates the connection of multiple second elbows 14 with the inlet end of the condenser. At the same time, the medium flowing through the second elbow 14 at high speed flows into the buffer chamber 16 and the flow velocity is reduced, which plays a role in reducing noise.

[0038] Although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A heat recovery device for a hot and cold water unit, comprising a heat exchange housing (1), characterized in that: A spiral heat exchange tube (2) is provided in the heat exchange shell (1), both ends of the spiral heat exchange tube (2) pass through the heat exchange shell (1) and extend to the outside of the heat exchange shell (1), a valve (13) is installed at one end of the spiral heat exchange tube (2), and a connecting pipe (10) for connecting to the discharge end of the compressor is installed at the end of the valve (13) away from the spiral heat exchange tube (2), a drain pipe joint (17) is installed at the lower position of one end of the heat exchange shell (1), and the drain pipe joint (17) extends to the upper position inside the heat exchange shell (1), and a water inlet pipe joint (19) is installed at the lower position of the end of the heat exchange shell (1) away from the drain pipe joint (17), and a plurality of concentrically arranged annular covers (6) are provided on the outside of the end of the spiral heat exchange tube (2) close to the valve (13), and the inner diameters of the plurality of annular covers (6) gradually increase from the inside to the outside, and the annular covers (6) face the side of the heat exchange shell (1). The annular cover (6) is in an open shape, and the open end of the annular cover (6) is in contact with the surface of the heat exchange shell (1). A sealing ring is provided between the annular cover (6) and the heat exchange shell (1). A first bend pipe (12) is installed on the upper surface of the plurality of annular covers (6). A stop valve (11) is installed on the end of the first bend pipe (12) away from the annular cover (6). A distribution pipe (9) is installed on the end of the stop valve (11) away from the first bend pipe (12). The upper end of the distribution pipe (9) is connected to the connecting pipe (10). A second bend pipe (14) for connecting to the inlet end of the condenser is installed on the side of the upper surface of the plurality of annular covers (6) away from the first bend pipe (12). The annular cover (6) is connected to the heat exchange shell (1) through a limiter. The high-temperature medium discharged from the compressor flows into the independent space formed by the plurality of annular covers (6) and the heat exchange shell (1) through the connecting pipe (10), the distribution pipe (9) and the first bend pipe (12).

2. The heat recovery device for a hot and cold water unit according to claim 1, characterized in that: The limiting member includes a transverse plate (3), and both sides of the annular cover (6) are provided with transverse plates (3) arranged in parallel with each other. A plurality of first curved pipes (12) are sleeved on the vertical parts thereof, and the first pipe sleeve (21) is in contact with the annular cover (6). Two first support plates (7) are symmetrically fixed on the outer surface of the first pipe sleeve (21), and the two first support plates (7) on one first pipe sleeve (21) are connected and fixed to the two transverse plates (3) at one end away from the first pipe sleeve (21). A plurality of second curved pipes (14) are sleeved on the vertical parts thereof, and the second pipe sleeve (24) is in contact with the annular cover (6). Two second support plates (23) are symmetrically fixed on the outer surface of the second pipe sleeve (24), and the second support plates (23) are arranged parallel to the first support plate (7). The two second support plates (23) on one second pipe sleeve (24) are respectively connected and fixed to the two transverse plates (3) at one end away from the second pipe sleeve (24). A small hole (22) is opened in the middle position of the upper surface of the two transverse plates (3), and a positioning seat (5) is provided on the lower side of the two transverse plates (3). The positioning seat (5) is connected and fixed to the heat exchange shell (1), and a connecting screw (4) is inserted in the small hole (22). The lower end of the connecting screw (4) is threadedly connected to the positioning seat (5).

3. The heat recovery device for a hot and cold water unit according to claim 2, characterized in that: The upper surface of the positioning seat (5) is provided with a circular hole (26) aligned with the small hole (22); the lower surface of the positioning seat (5) is recessed upward to form a rectangular groove (29); the rectangular groove (29) is communicated with the circular hole (26); a connecting seat (20) is inserted into the rectangular groove (29); the connecting seat (20) has a rectangular cross section; the upper surface of the connecting seat (20) is provided with a screw hole (31) aligned with the circular hole (26); the lower end of the connecting screw (4) passes through the small hole (22) and the circular hole (26) and is then threadedly connected to the screw hole (31).

4. The heat recovery device for a hot and cold water unit according to claim 3, characterized in that: The side of the upper surface of the connecting seat (20) away from the circular hole (26) is recessed downward to form two blind holes (18), and vertically arranged springs (33) are inserted into the two blind holes (18).

5. The heat recovery device for a hot and cold water unit according to claim 4, characterized in that: A connecting plate (32) is provided on the upper side of the connecting seat (20), and the connecting plate (32) is arranged directly above the spring (33), and the upper end of the spring (33) is connected and fixed to the connecting plate (32).

6. The heat recovery device for a hot and cold water unit according to claim 1, characterized in that: The lower end of the distribution pipe (9) is open, and the outer surface of the lower end of the distribution pipe (9) is processed with an external thread. One end of the distribution pipe (9) processed with the external thread is threadedly connected to a threaded cover (8).

7. The heat recovery device for a hot and cold water unit according to claim 1, characterized in that: A buffer chamber (16) is installed on the side of the outer surface of the heat exchange shell (1) close to the second elbow (14); the end of the second elbow (14) away from the annular cover (6) is connected to the buffer chamber (16); and a branch pipe (15) connected to the inlet end of the condenser is installed on the upper surface of the buffer chamber (16).

8. The heat recovery device for a hot and cold water unit according to claim 1, characterized in that: A first through-hole (25) is provided at an upper position of an outer surface of one end of the heat exchange shell (1) close to the valve (13), a third through-hole (28) is provided at a lower position of a side of the heat exchange shell (1) away from the first through-hole (25), two ends of the spiral heat exchange tube (2) respectively pass through the first through-hole (25) and the third through-hole (28), a second through-hole (27) is provided at a position where the water inlet pipe joint (19) is installed on the heat exchange shell (1), one end of the water inlet pipe joint (19) is fixed in the second through-hole (27), a fourth through-hole (30) is provided at a position where the drain pipe joint (17) is installed on the heat exchange shell (1), and the drain pipe joint (17) passes through the fourth through-hole (30).

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