Heat recovery device of water chiller-heater unit

Abstract

The invention relates to the technical field of water chiller-heater units, in particular to a heat recovery device of a water chiller-heater unit, which comprises a heat exchange shell, a spiral heat exchange pipe is arranged in the heat exchange shell, a plurality of concentrically arranged annular covers are arranged on the outer side of one end, close to a valve, of the spiral heat exchange pipe, and first bent pipes are mounted on the upper surfaces of the annular covers; the ends, away from the annular covers, of the first bent pipes are provided with stop valves, the ends, away from the first bent pipes, of the stop valves are provided with distribution pipes, and the sides, away from the first bent pipes, of the upper surfaces of the annular covers are provided with second bent pipes used for being connected with the inlet end of a condenser. The heat exchanger has the following beneficial effects that the area, where the spiral heat exchange pipe is installed, of the heat exchange shell is gradually heated through heat generated by working of the compressor, so that the temperature of the part, where the spiral heat exchange pipe is installed, of the heat exchange shell is gradually decreased with the spiral heat exchange pipe as the center; therefore, the part, provided with the spiral heat exchange pipe, of the heat exchange shell cannot generate large thermal stress due to overhigh local temperature within a short time.

Description

Technical Field

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

[0002] The hot and cold water unit is an energy-saving and efficient cooling device that obtains cold energy through heat exchange between water and air. The unit 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, and 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 utilizing the heated water and realizing 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 area of ​​the heat exchange shell where the spiral heat exchange tube is installed will have a large temperature rise in a short period of time, thereby causing the thermal stress in the area of ​​the heat exchange shell where the spiral heat exchange tube is installed 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 shortcomings of 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 penetrate 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, a connecting pipe for connecting to the discharge end of a 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, a water inlet pipe joint is installed at the lower position of one end of the heat exchange shell away from the drain pipe joint, and a water exchange pipe joint is installed at one end of the spiral heat exchange tube near the valve. A plurality of concentrically arranged annular covers are provided on the outer side of the end, and the inner diameters of the 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 elbow is installed on the upper surface of the plurality of annular covers, and a stop valve is installed on the end of the first elbow away from the annular cover, and a distribution pipe is installed on the end of the stop valve away from the first elbow, and the upper end of the distribution pipe is connected to the connecting pipe. A second elbow for connecting 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 elbow, and the annular cover is connected to the heat exchange shell through a limiter.

[0006] Specifically, the limit member includes a transverse plate, both sides of the annular cover are provided with transverse plates arranged parallel to each other, a plurality of the first curved pipe vertical parts are sleeved with a first pipe sleeve, the first pipe sleeve is in contact with the annular cover, two first support plates are symmetrically fixed to the outer surface of the first pipe sleeve, one end of the two first support plates on the first pipe sleeve away from the first pipe sleeve is respectively connected and fixed with two transverse plates, a plurality of the second curved pipe vertical parts are sleeved with a second pipe sleeve, the second pipe sleeve is in contact with the annular cover, two second support plates are symmetrically fixed to the outer surface of the second pipe sleeve, the second support plates are arranged parallel to the first support plates, one end of the two second support plates on the second pipe sleeve away from the second pipe sleeve is respectively connected and fixed with two transverse plates, small holes are opened in the middle of the upper surfaces of the two transverse plates, and positioning seats are provided on the lower sides of the two transverse plates, the positioning seats are connected and fixed to the heat exchange shell, connecting screws are inserted in the small holes, and the lower ends of the connecting screws are threadedly connected with the positioning seats.

[0007] Specifically, a circular hole aligned with the small hole is formed 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 formed 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 in 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 in both of 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 with a threaded cap.

[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 of 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 of a side of the heat exchange shell away from the first through hole, both ends of the spiral heat exchange tube pass through the first through hole and the third through hole respectively, 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, and then open the stop valves on the multiple first elbows, so that the opening of the stop valves on the multiple first elbows gradually increases in the direction close to the valve, 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 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 where the spiral heat exchange tube is installed in the heat exchange shell is gradually reduced with the spiral heat exchange tube as the center, so that the part where the spiral heat exchange tube is installed in the heat exchange shell will not generate large thermal stress due to excessive local temperature in a short time. After preheating the part where the spiral heat exchange tube is installed in the heat exchange shell, 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 cross plate, and use the second support plate to connect the second pipe sleeve and the cross 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 and hold 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 cross 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. One end of the connecting screw passes through the small hole and the round hole and is screwed into the screw hole. The assembly of the connecting screw, the connecting seat and the positioning seat is completed, and the connection between the connecting screw and the positioning seat is realized. 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, the maintenance cost is reduced, and on the other hand, the difficulty of replacing the damaged part of the screw hole is reduced. At the same time, because part of the rod of the connecting screw is in an exposed state, another way is provided for removing the connecting screw by cutting off in the later stage.

[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, and 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, with 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 bends, and install a branch pipe connected to the inlet end of the condenser on the buffer chamber, so as to facilitate the connection of multiple second bends with the inlet end of the condenser. At the same time, the medium flowing through the second bends 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 from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0020] Figure 1 This is a schematic structural 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 of the present invention from another perspective;

[0022] Figure 3It 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 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 It 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 It 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 It is a schematic diagram of the assembly of a positioning seat and a heat exchange shell in a heat recovery device of a hot and cold water unit of the present invention;

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

[0028] Fig. 9 It is a schematic diagram of assembling 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, cross 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 easy to understand, the present invention is further explained 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, a spiral heat exchange tube 2 is arranged in the heat exchange shell 1, both ends of the spiral heat exchange tube 2 penetrate 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 a 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 opened at the upper position of the outer surface of the end of the heat exchange shell 1 close to the valve 13, and a third through hole 28 is opened at the lower position of 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 penetrate 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, 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 one end of the heat exchange shell 1 away from the drain pipe joint 17, wherein 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, and one end of the water inlet pipe joint 19 is fixed in the second through-hole 27, and a fourth through-hole 30 is provided at the position where the drain pipe joint 17 is installed in the heat exchange shell 1, and the drain pipe joint 17 passes through the fourth through-hole 30, and 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 also 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, 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, 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 with a threaded cover 8, and the threaded cover 8 realizes the blocking of the lower end of the distribution pipe 9.

[0033] See also 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 that flows into the multiple annular covers 6 per unit time gradually increases from the outside to the inside , the heat generated by the operation of the compressor is used to gradually heat up the area of ​​the heat exchange shell 1 where the spiral heat exchange tube 2 is installed, 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 produce a large thermal stress due to excessive local temperature in a short time. After the preheating of the part of the heat exchange shell 1 where the spiral heat exchange tube 2 is installed is completed, the valve 13 is opened and the stop valve 11 is closed, 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 also Figure 1-Figure 8 , 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 with first pipe sleeves 21 on the vertical parts, 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 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 with second pipe sleeves 24 on the vertical parts, the second pipe sleeve 24 is in contact with the annular cover 6, and two second support plates 23 are symmetrically fixed to the outer surface of the second pipe sleeve 24, the second support plates 23 are arranged in parallel with the first support plates 7, and the two second support plates 23 on one second pipe sleeve 24 are connected and fixed to the two transverse plates 3 at one end away from the second pipe sleeve 24, and the two transverse 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 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 in 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, so that 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 and hold 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 elbows 12 and the multiple second elbows 14 to each other, thereby improving the stability of the structure.

[0035] See also Figure 1-Figure 9The 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 in 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 in the screw hole 31, so that the connecting seat 20 is inserted in 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 then 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 the like, 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, the maintenance cost is reduced, and on the other hand, the difficulty of replacing the damaged part of the screw hole 31 is reduced. At the same time, since a part of the rod of the connecting screw 4 is in an exposed state, another method is provided for removing the connecting screw 4 by cutting off in the later stage.

[0036] See also Fig. 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. A vertically arranged spring 33 is inserted in each of the two blind holes 18. A connecting plate 32 is provided on the upper side of the connecting seat 20. 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 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 together 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 end. There is no need to synchronize the depth of the two connecting screws 4 screwed into the screw hole 31, reducing the difficulty of concentrically installing the annular cover 6 and the spiral heat exchange tube 2 mounting valve 13 end.

[0037] See also 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. A plurality of second elbows 14 are connected by the buffer chamber 16, and the branch pipe 15 connected to the inlet end of the condenser is installed on the buffer chamber 16, so that the plurality of second elbows 14 are connected to the inlet end of the condenser. At the same time, the medium flowing through the second elbow 14 at a high speed has a lower flow velocity after flowing into the buffer chamber 16, which plays a role in reducing noise.

[0038] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description 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 may also be appropriately combined to form other implementation modes 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) penetrate the heat exchange shell (1) and extend to the outside of the heat exchange shell (1), one end of the spiral heat exchange tube (2) is provided with a valve (13), and the end of the valve (13) away from the spiral heat exchange tube (2) is provided with a connecting pipe (10) for connecting to the discharge end of the compressor, a drainage pipe joint (17) is provided at the lower position of one end of the heat exchange shell (1), the drainage pipe joint (17) extends to the upper position of the heat exchange shell (1), and a water inlet pipe joint (19) is provided at the lower position of the end of the heat exchange shell (1) away from the drainage pipe joint (17), and 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), and the plurality of annular covers (6) are provided with a plurality of concentrically arranged annular covers (6) The inner diameter increases gradually from the inside to the outside; the side of the annular cover (6) facing the heat exchange shell (1) is open; 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 and communicates with the connecting pipe (10); a second elbow (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 elbow (12); and the annular cover (6) is connected to the heat exchange shell (1) via a stop member.

2. A heat recovery device for a hot and cold water unit according to claim 1, characterized in that: The limiting member comprises 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 the first curved pipes (12) are sleeved with a first pipe sleeve (21) on their vertical parts, and the first pipe sleeve (21) is 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 one of the first pipe sleeves (21) are connected and fixed to the two transverse plates (3) at one end away from the first pipe sleeve (21). A plurality of the second curved pipes (14) are sleeved with a second pipe sleeve (24) on their vertical parts, 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 in parallel with the first support plate (7). The two second support plates (23) on one of the second pipe sleeves (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 of the upper surface of the two transverse plates (3). 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). 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).

3. A 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 in 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 then threadedly connected in 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 connection 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 external threads. One end of the distribution pipe (9) processed with external threads 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 outer surface of the heat exchange shell (1) on a side close to the second curved pipe (14); an end of the second curved pipe (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 penetrate 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), and 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) penetrates the fourth through hole (30).

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