An economizer and liquid accumulator integrated plate and shell heat exchanger

Abstract

The application discloses an economizer and liquid accumulator integrated plate-and-shell heat exchanger, and relates to the field of heat exchangers.The economizer and liquid accumulator integrated plate-and-shell heat exchanger comprises a shell, a mounting cavity is formed in the shell, the shell comprises a shell base and a top plate, the top plate is bolted to the shell base, a heat exchange plate group for heat exchange is mounted in the mounting cavity, heat cavities and cold cavities are formed in the heat exchange plate group at intervals, an economizer expansion valve pipe, a compressor connecting pipe, a condenser connecting pipe and a main circuit connecting pipe are arranged on the shell, the economizer expansion valve pipe and the compressor connecting pipe are communicated with the heat cavities, the condenser connecting pipe and the main circuit connecting pipe are communicated with the cold cavities, a buffer cavity is formed in the bottom of the mounting cavity, the main circuit connecting pipe is arranged at the bottom of the shell, an intermediate pipe which is communicated with the buffer cavity is arranged at the bottom of the heat exchange plate group, and the intermediate pipe is communicated with the cold cavities.The application aims to improve the stability of the economizer, ensure the supercooling degree of the economizer to refrigerant and ensure the refrigeration efficiency of the whole unit.

Description

Technical Field

[0001] This application relates to the field of heat exchangers, and more particularly to a plate-and-shell heat exchanger that integrates an economizer and a liquid receiver. Background Technology

[0002] The current structure of centrifugal water-cooled units mainly includes a centrifugal compressor, condenser, economizer, orifice plate, and evaporator.

[0003] In the prior art, a plate-type economizer includes a mounting frame with multiple heat exchange plates installed within it. A heat exchange cavity is formed between two adjacent heat exchange plates, consisting of a cold cavity and a hot cavity, spaced apart. The mounting frame is equipped with an economizer expansion valve pipe, a compressor connecting pipe, a condenser connecting pipe, and a main circuit connecting pipe. The economizer expansion valve pipe and the compressor connecting pipe are connected to the hot cavity, allowing refrigerant to flow into the hot cavity through the expansion valve pipe and then exit through the compressor connecting pipe. The condenser connecting pipe and the main circuit connecting pipe are connected to the cold cavity, allowing refrigerant to flow into the cold cavity through the condenser connecting pipe and then exit through the main circuit connecting pipe. This allows the economizer to achieve a subcooled state, improving the efficiency of the entire refrigeration system.

[0004] Regarding the aforementioned existing technologies, plate heat exchangers have small internal volume and large pressure drop. When there are large fluctuations in the condenser or evaporator of the unit, it affects the subcooling of the refrigerant after it flows out of the economizer in the main circuit connecting pipe, reduces the overall cooling efficiency of the unit, and affects the operational stability of the unit, so improvements are urgently needed.

[0005] Summary of the Invention To improve the stability of the economizer, ensure the subcooling of the refrigerant by the economizer, and ensure the overall cooling efficiency of the unit, this application provides an integrated plate-and-shell heat exchanger that combines the economizer and the receiver.

[0006] The integrated plate-shell heat exchanger combining an economizer and a liquid receiver provided in this application adopts the following technical solution: The device includes a housing with an installation cavity inside. The housing includes a base and a top plate, with the top plate bolted to the base. A heat exchange plate assembly for heat exchange is installed in the installation cavity. A hot cavity and a cold cavity are spaced apart within the heat exchange plate assembly. An economizer expansion valve pipe, a compressor connecting pipe, a condenser connecting pipe, and a main circuit connecting pipe are provided on the housing. The economizer expansion valve pipe and the compressor connecting pipe are both connected to the hot cavity, and the condenser connecting pipe and the main circuit connecting pipe are both connected to the cold cavity. A buffer cavity is provided at the bottom of the installation cavity. The main circuit connecting pipe is located at the bottom of the housing. An intermediate pipe connected to the buffer cavity and the cold cavity is provided at the bottom of the heat exchange plate assembly.

[0007] By adopting the above technical solution, during use, the refrigerant in the condenser enters the cold cavity, reducing the temperature inside the cold cavity. This allows the refrigerant to enter the hot cavity through the economizer expansion valve pipe, and the temperature of the refrigerant gas discharged through the compressor connecting pipe is reduced. This makes the liquid entering the buffer cavity subcooled before being discharged through the main circuit connecting pipe. This improves the stability of the economizer, ensures the subcooling of the refrigerant by the economizer, and ensures the overall cooling efficiency of the unit.

[0008] Preferably, the heat exchange plate assembly includes a fixing frame fixed to the bottom of the top plate, multiple heat exchange plates are inserted into the fixing frame, a locking plate for pressing the heat exchange plates is slidably connected to the fixing frame, and a locking nut for pressing the locking plate is threadedly connected to the fixing frame.

[0009] By adopting the above technical solution, the heat exchange plate can be pressed more easily during use by cooperating with the locking nut, fixing bracket and locking plate, thereby improving the convenience of heat exchange plate replacement.

[0010] Preferably, the buffer cavity is provided with a connector, which is connected to the main circuit connecting pipe. A lifting ring is slidably connected to the connector, and the lifting ring is inserted into the intermediate pipe. A support spring is sleeved on the connector to support the lifting ring. A limit ring is provided on the inner wall of the lifting ring. The thickness of the limit ring gradually increases in the direction away from the connector. The limit ring is slidably connected between the connector and the intermediate pipe to limit the sliding distance of the lifting ring. When the refrigerant flow rate discharged from the connector increases, it pushes the limit ring closer to the connector. When the lifting ring is close to the connector, the lifting ring and the intermediate pipe form a discharge annular cavity connected to the buffer cavity. A discharge hole connected to the buffer cavity is opened on the side wall of the connector.

[0011] By adopting the above technical solution, during use, when the refrigerant is working normally and stably, the liquid directly enters the insertion pipe from the intermediate pipe, allowing the refrigerant to flow more directly and smoothly. When the working process of the condenser and evaporator changes, the refrigerant flow rate increases, which can push the limiting ring to move, thereby causing the lifting ring sleeve to descend and allowing the refrigerant to be discharged from the discharge ring cavity into the buffer cavity. At the same time, it can also achieve the purpose of sealing the discharge hole, thus allowing the refrigerant to move more smoothly and stably. When the refrigerant tends to be stable, the lifting ring sleeve is reset under the action of the support spring, and the refrigerant in the buffer cavity can be discharged in conjunction with the discharge hole.

[0012] Preferably, the inner wall of the insertion tube is provided with a variable diameter ring platform, the inner diameter of the variable diameter ring platform is the same as the inner diameter of the limiting ring, the two sides of the variable diameter ring platform are formed with chamfered rings, and the discharge hole is opened through the variable diameter ring platform.

[0013] By adopting the above technical solution, during use, the Venturi tube pipeline can be reached through the discharge hole and the variable diameter ring platform. This allows the refrigerator in the buffer chamber to be extracted when the refrigerant is flowing stably, improving the convenience of refrigerant discharge.

[0014] Preferably, the condenser connecting pipe includes a main pipe and multiple branch pipes, the branch pipes are connected to the main pipe, the branch pipes are arranged in a circumferential array on the periphery of the housing, and the cold cavity at the end away from the main circuit connecting pipe is connected to the multiple branch pipes.

[0015] By adopting the above technical solution, during use, multiple branch pipes can enable the refrigerant to flow more stably into the cold cavity, thereby improving the stability of the refrigerant flow.

[0016] Preferably, the housing has an installation cavity, the heat exchange plate assembly consists of multiple heat exchange discs, the heat exchange discs are inserted into the installation cavity, the sidewall of the installation cavity has multiple sliding grooves along the depth direction of the installation cavity, a limiting baffle is slidably connected in the sliding groove, the limiting baffle is used to limit the position of the heat exchange disc, two sliding cylinders are provided on both sides of the limiting baffle, and limiting sliding grooves are provided on both sides of the sliding groove to slide and cooperate with the sliding cylinders; the limiting sliding groove includes multiple limiting areas, ejection areas and sliding areas spaced apart, the limiting areas lock and limit the movement of the two sliding cylinders, used to lock the limiting baffle and press the heat exchange disc, an ejection block is slidably connected in the ejection area, the bottom of the ejection block is provided with an ejection spring for pushing the ejection block to move closer to the heat exchange disc, the ejection block is used to ensure that the sliding cylinder moves from the limiting area to the sliding area.

[0017] By adopting the above technical solution, the heat exchange disc pushes the sliding cylinder to move closer to the ejector block. Under the action of the ejector spring, the sliding cylinder can move into the sliding area, and the limiting baffle extends, thereby limiting the heat exchange disc. When the next heat exchange disc needs to be installed, pressing down on the heat exchange disc causes the limiting baffle to retract, and the movement of the sliding cylinder is repeated, thus better limiting the heat exchange disc. With this design, each heat exchange disc can be fully compressed during individual installation, thereby reducing the difficulty of compression at the end and improving the convenience of heat exchange disc installation.

[0018] Preferably, the sliding groove has a reset cavity on both sides opposite to it, which is slidably engaged with the sliding cylinder. The reset cavity includes a vertically opened moving groove and connecting grooves on both sides of the moving groove. The connecting grooves are connected to the upper and lower ends of the limiting sliding groove.

[0019] By adopting the above technical solution, when it is necessary to clean or replace the heat exchange discs, the limit baffle can be quickly reset through the reset cavity, improving the convenience of using the reset baffle.

[0020] Preferably, locking slots are provided on both sides of the heat exchange disc near the top plate. The locking slots engage with the limiting baffle. A locking block is telescopically connected to the side wall of the connecting groove. A locking spring is provided at the bottom of the locking block for pushing the locking block. When the locking block is pushed out, it is used to press the limiting baffle.

[0021] By adopting the above technical solution, during use, on the one hand, after the heat exchange disc is pressed, it can be re-locked under the action of the limiting baffle and the locking slot, which improves the stability of using the heat exchange disc. On the other hand, it can reduce the movement of the limiting baffle, reduce the internal noise, and improve the stability of using the heat exchanger.

[0022] Preferably, a compression plate is provided in the buffer cavity, and the compression plate has an intermediate hole that is inserted and matched with the intermediate tube. An intermediate compression spring for pushing the compression plate is sleeved on the intermediate tube. A limiting protrusion is provided at one end of the intermediate tube near the main circuit connecting pipe. The limiting protrusion is used to limit the movement distance of the compression plate.

[0023] By adopting the above technical solution and this design, the bottom of the buffer chamber can be squeezed when under pressure, thereby meeting the buffering requirements of the refrigerant. When the pressure tends to stabilize, the liquid can be discharged better. This is mainly for heat exchangers with inclined settings, which allows the refrigerant to be discharged better through the main circuit connection pipe, improving the smoothness of refrigerant flow.

[0024] Preferably, a filling arc block is rotatably connected to the extrusion plate, the filling arc block is eccentrically disposed on the extrusion plate, and the filling arc block abuts against the inner wall of the buffer cavity.

[0025] By adopting the above technical solution, when the heat exchanger is tilted, the filling arc block will tilt downwards under its own weight, thereby filling the bottom of the buffer chamber, allowing the refrigerant inside to circulate better, and also restricting the movement of the extrusion plate, thus improving the stability of the extrusion plate.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. During use, the refrigerant in the condenser enters the cold cavity, lowering the temperature inside the cold cavity. This allows the refrigerant to enter the hot cavity through the economizer expansion valve pipe and then be discharged through the compressor connecting pipe at a lower temperature. This makes the liquid entering the buffer cavity subcooled before being discharged through the main circuit connecting pipe. This improves the stability of the economizer, ensures the subcooling of the refrigerant by the economizer, and ensures the overall cooling efficiency of the unit. 2. During use, when the refrigerant is working normally and stably, the liquid enters the inlet pipe directly from the intermediate pipe, allowing the refrigerant to flow more directly and smoothly. When the working process of the condenser and evaporator changes, the refrigerant flow rate increases, which can push the limit ring to move, thereby causing the lifting ring sleeve to descend and allowing the refrigerant to be discharged from the discharge ring cavity into the buffer cavity. At the same time, it can also achieve the purpose of sealing the discharge hole, thus allowing the refrigerant to move more smoothly and stably. When the refrigerant tends to be stable, the lifting ring sleeve is reset under the action of the support spring, and the refrigerant in the buffer cavity can be discharged through the discharge hole. 3. The heat exchange discs push the sliding cylinder towards the ejector block. Under the action of the ejector spring, the sliding cylinder moves into the sliding area, causing the limiting baffle to extend, thus restricting the heat exchange discs. When installing the next heat exchange disc, pressing down on the heat exchange disc causes the limiting baffle to retract, and the movement of the sliding cylinder is repeated, thus better limiting the heat exchange discs. This design allows each heat exchange disc to be fully compressed during individual installation, reducing the difficulty of final compression and improving the ease of heat exchange disc installation. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of an integrated plate-shell heat exchanger that combines an economizer and a liquid receiver, according to Embodiment 1 of this application. Figure 2 This is a schematic diagram illustrating the main structure of the fixing frame in Embodiment 1 of this application; Figure 3 This is a schematic diagram illustrating the lifting ring connection structure, which is the main feature of Embodiment 2 of this application. Figure 4 This is a schematic diagram illustrating the sliding structure of the lifting ring sleeve under pressure, as shown in Embodiment 2 of this application. Figure 5 This is a schematic diagram illustrating the main structure of the mounting cavity in Embodiment 3 of this application; Figure 6 for Figure 5 An enlarged schematic diagram of part A in the middle; Figure 7 This is a schematic diagram illustrating various different positions of the limiting baffle in Embodiment 3 of this application; Figure 8This is a schematic diagram illustrating the extrusion plate structure, which is the main feature of Embodiment 3 of this application. Reference numerals: 1. Top plate; 2. Fixing frame; 3. Shell base; 4. Heat exchange plate; 5. Buffer chamber; 6. Economizer expansion valve pipe; 7. Compressor connecting pipe; 8. Condenser connecting pipe; 9. Intermediate pipe; 10. Main circuit connecting pipe; 11. Locking plate; 12. Locking nut; 13. Hot chamber; 14. Cold chamber; 15. Limiting ring; 16. Lifting ring sleeve; 17. Support spring; 18. Variable diameter ring platform; 19. Insertion pipe; 20. Discharge hole; 21. Discharge ring cavity; 221. Main pipe; 222. Branch pipe; 23. Moving groove; 24. Ejection spring; 25. Connecting groove; 26. Locking slot; 27. Sliding groove; 28. Ejection block; 29. ​​Limiting baffle; 30. Limiting slide groove; 301. Limiting area; 302. Ejection area; 303. Sliding area; 304. Positioning slot; 31. Sliding cylinder; 32. Locking spring; 33. Locking block; 34. Intermediate spring; 35. Extrusion plate; 36. Limiting protrusion ring; 37. Filling arc block; 38. Mounting cavity; 39. Heat exchange disc; 40. Mounting cavity groove. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1 - Figure 8 This application will be described in further detail.

[0029] This application discloses an integrated plate-shell heat exchanger that combines an economizer and a liquid receiver.

[0030] Example 1; Reference Figure 1 An integrated plate-and-shell heat exchanger for an economizer and a liquid receiver includes a shell with a cylindrical mounting cavity 38. The shell includes a base 3 and a top plate 1. The base 3 is cylindrical, and the top plate 1 is circular. The top plate 1 is bolted to the base 3. A heat exchange plate assembly for heat exchange is installed in the mounting cavity 38. Hot chambers 13 and cold chambers 14 are spaced apart within the heat exchange plate assembly. An economizer expansion valve pipe 6, a compressor connecting pipe 7, a condenser connecting pipe 8, and a main circuit connecting pipe 10 are installed on the shell. The economizer expansion valve pipe 6 and the compressor connecting pipe 7 are installed on the top plate 1. The condenser connecting pipe 8 is installed on the side wall of the base 3, and the main circuit connecting pipe 10 is installed at the center of the bottom of the base 3. The expansion valve pipe 6 of the economizer and the connecting pipe 7 of the compressor are both connected to the hot cavity 13. The connecting pipe 8 of the condenser and the connecting pipe 10 of the main circuit are both connected to the cold cavity 14. A buffer cavity 5 is opened at the bottom of the mounting cavity 38. An intermediate pipe 9 connected to the buffer cavity 5 is installed at the bottom of the heat exchange plate assembly. The intermediate pipe 9 is connected to the cold cavity 14. Thus, when the refrigerant changes during the adjustment of the condenser and evaporator, the refrigerant can be buffered in the buffer cavity 5, so that the refrigerant can flow more stably.

[0031] The heat exchange plate assembly includes a mounting frame 2 fixed to the bottom of the top plate 1. Multiple heat exchange plates 4 are inserted into the mounting frame 2. A locking plate 11 for pressing the heat exchange plates 4 is slidably connected to the mounting frame 2. A locking nut 12 for pressing the locking plate 11 is threadedly connected to the mounting frame 2. This allows the multiple heat exchange plates 4 to be pressed more tightly, ensuring the sealing of the hot cavity 13 and the cold cavity 14.

[0032] The implementation principle of the integrated plate-and-shell heat exchanger of the economizer and the liquid receiver in this application embodiment is as follows: During use, the refrigerant in the condenser enters the cold cavity 14, reducing the temperature inside the cold cavity 14. This allows the refrigerant to enter the hot cavity 13 through the economizer expansion valve pipe 6, and the temperature of the refrigerant gas discharged through the compressor connecting pipe 7 is reduced. This allows the liquid entering the buffer cavity 5 to be in a subcooled state, and then discharged through the main circuit connecting pipe 10. This can improve the stability of the economizer, ensure the subcooling of the refrigerant by the economizer, and ensure the overall cooling efficiency of the unit.

[0033] Example 2; Reference Figure 3 The difference between this embodiment and Embodiment 1 is that a connector 19 is installed inside the buffer chamber 5. The connector 19 is annular and coaxial with and connected to the main circuit connecting pipe 10. A lifting ring 16 is slidably connected to the connector 19. The lifting ring 16 is inserted into the intermediate pipe 9. A support spring 17 is sleeved on the connector 19 to support the lifting ring 16. A limiting ring 15 is installed on the inner wall of the lifting ring 16. The thickness of the limiting ring 15 gradually increases in the direction away from the connector 19. The limiting ring 15 is slidably connected between the connector 19 and the intermediate pipe 9 to limit the sliding distance of the lifting ring 16. On the one hand, it can limit the movement distance of the lifting ring 16, and on the other hand, it can push the lifting ring 16 down when the refrigerant flow rate changes. When the lifting ring 16 is close to the connector 19, the lifting ring 16 and the intermediate pipe 9 form a discharge annular cavity 21 that communicates with the buffer chamber 5. A discharge hole 20 that communicates with the buffer chamber 5 is opened on the side wall of the connector 19. The inner wall of the connector 19 is integrally formed with a reducing ring 18, the inner diameter of which is the same as that of the limiting ring 15. Chamfered rings are formed on both sides of the reducing ring 18, and the discharge hole 20 is formed through the reducing ring 18. A Venturi tube can be formed, so that when the refrigerant flow increases, the lifting ring 16 closes the discharge hole 20; when the refrigerant flow is stable, the refrigerant can be smoothly extracted based on the principle of the Venturi tube.

[0034] The condenser connecting pipe 8 includes a main pipe 221 and multiple branch pipes 222. The branch pipes 222 are connected to the main pipe 221. The branch pipes 222 are arranged in a circumferential array on the periphery of the housing. The cold cavity 14 at the end away from the main circuit connecting pipe 10 is connected to the multiple branch pipes 222.

[0035] The implementation principle of Example 2 is as follows: During use, when the refrigerant is working normally and stably, the liquid enters the insertion pipe 19 directly from the intermediate pipe 9, which allows the refrigerant to flow more directly and smoothly. When the working process of the condenser and evaporator changes, the flow rate of the refrigerant increases, which can push the limiting ring 15 to move, thereby causing the lifting ring sleeve 16 to descend, allowing the refrigerant to be discharged from the discharge ring cavity 21 into the buffer cavity 5, and at the same time, the purpose of sealing the discharge hole 20 can be achieved, thus allowing the refrigerant to move more smoothly and stably. When the refrigerant tends to be stable, the lifting ring sleeve 16 is reset under the action of the support spring 17, and the refrigerant in the buffer cavity 5 can be discharged in conjunction with the discharge hole 20.

[0036] Example 3; Reference Figure 5 The housing has an installation cavity 40. The heat exchange plate assembly consists of multiple heat exchange discs 39, which are inserted into the installation cavity 40. Multiple sliding grooves 27 are formed along the depth of the installation cavity 40 on its sidewall. Each sliding groove 27 is rectangular and contains a limiting baffle 29 that slides within it. The limiting baffle 29 restricts the position of the heat exchange discs 39. Two sliding cylinders 31 are installed on each side of the limiting baffle 29. Limiting grooves 30 are formed on both sides of the sliding groove 27 to slide and engage with the sliding cylinders 31. The limiting grooves 30 are S-shaped and include multiple spaced limiting areas 301, ejection areas 302, and sliding areas 303. These three areas form a cycle, allowing the limiting baffles 29 to move periodically. The limiting area 301 engages and restricts the movement of the two sliding cylinders 31. After the heat exchange disc 39 is pressed in, the limiting baffle 29 is locked and the heat exchange disc 39 is pressed tightly. A positioning slot 304 is provided on the side wall of the limiting area 301. The positioning slot 304 abuts against the sliding cylinder 31, thereby more conveniently restricting the position of the limiting baffle 29. An ejection block 28 is slidably connected in the ejection area 302. An ejection spring 24 is installed at the bottom of the ejection block 28 to push the ejection block 28 closer to the heat exchange disc 39. The ejection spring 24 is used to ensure that the sliding cylinder 31 moves from the limiting area 301 to the sliding area, thereby allowing the limiting baffle 29 to rise upward and improving the stability of the limiting baffle 29 in restricting the heat exchange disc 39.

[0037] The sliding groove 27 has reset cavities on both sides opposite to the sliding cylinder 31, which slide and cooperate with the sliding cylinder 31. The reset cavity includes a vertically opened moving groove 23 and connecting grooves 25 on both sides of the moving groove 23. The connecting grooves 25 are connected to the upper and lower ends of the limiting sliding groove 30. The heat exchange disc 39 near the top plate 1 has locking slots 26 on both sides. The locking slots 26 are engaged with the limiting baffle 29. The side wall of the connecting groove 25 is telescopically connected to a locking block 33. The bottom of the locking block 33 is equipped with a locking spring 32 for pushing the locking block 33. When the locking block 33 is pushed out, it is used to press the limiting baffle 29.

[0038] A compression plate 35 is installed inside the buffer chamber 5. The compression plate 35 has an intermediate hole that mates with the intermediate tube 9. An intermediate compression spring 34 is fitted on the intermediate tube 9 to push the compression plate 35. A limiting ring 36 is fixed to one end of the intermediate tube 9 near the main circuit connecting pipe 10. The limiting ring 36 is used to limit the movement distance of the compression plate 35. A filling arc block 37 is rotatably connected to the compression plate 35. The filling arc block 37 is eccentrically positioned on the compression plate 35 and abuts against the inner wall of the buffer chamber 5.

[0039] The implementation principle of Example 3 is as follows: the heat exchange disc 39 pushes the sliding cylinder 31 to move closer to the ejector block 28, and under the action of the ejector spring 24, the sliding cylinder 31 can move into the sliding area 303, and the limiting baffle 29 extends, thereby limiting the heat exchange disc 39. When the next heat exchange disc 39 needs to be installed, pressing down on the heat exchange disc 39 causes the limiting baffle 29 to retract, and the movement of the sliding cylinder 31 is repeated, thereby better limiting the heat exchange disc 39. With this design, each heat exchange disc 39 can be fully compressed during the individual installation process, thereby reducing the difficulty of compression at the end and improving the convenience of heat exchange disc 39 installation.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A plate-and-shell heat exchanger integrating an economizer and a liquid receiver, characterized in that: The system includes a housing with an installation cavity (38) inside. The housing includes a housing base (3) and a top plate (1). The top plate (1) is bolted to the housing base (3). A heat exchange plate assembly for heat exchange is installed in the installation cavity (38). A hot cavity (13) and a cold cavity (14) are spaced apart in the heat exchange plate assembly. An economizer expansion valve pipe (6), a compressor connecting pipe (7), a condenser connecting pipe (8), and a main circuit connecting pipe (10) are provided on the housing. The expansion valve pipe (6) and the compressor connecting pipe (7) are both connected to the hot cavity (13), the condenser connecting pipe (8) and the main circuit connecting pipe (10) are both connected to the cold cavity (14), the mounting cavity (38) has a buffer cavity (5) at the bottom, the main circuit connecting pipe (10) is located at the bottom of the shell, the heat exchange plate group has an intermediate pipe (9) at the bottom that is connected to the buffer cavity (5), and the intermediate pipe (9) is connected to the cold cavity (14).

2. The integrated plate-shell heat exchanger for both the economizer and the liquid receiver according to claim 1, characterized in that: The heat exchange plate assembly includes a fixing frame (2) fixed to the bottom of the top plate (1), a plurality of heat exchange plates (4) are inserted into the fixing frame (2), a locking plate (11) for pressing the heat exchange plates (4) is slidably connected to the fixing frame (2), and a locking nut (12) for pressing the locking plate (11) is threadedly connected to the fixing frame (2).

3. The integrated plate-shell heat exchanger for both the economizer and the liquid receiver according to claim 2, characterized in that: The buffer cavity (5) is provided with a connector (19), which is connected to the main circuit connecting pipe (10). A lifting ring (16) is slidably connected to the connector (19), and the lifting ring (16) is inserted into the intermediate pipe (9). A support spring (17) for supporting the lifting ring (16) is sleeved on the connector (19). A limit ring (15) is provided on the inner wall of the lifting ring (16). The thickness of the limit ring (15) gradually increases in the direction away from the connector (19). The positioning ring (15) is slidably connected between the insertion tube (19) and the intermediate tube (9) to limit the sliding distance of the lifting ring sleeve (16). When the refrigerant flow rate discharged from the insertion tube (19) increases, the positioning ring (15) is pushed closer to the insertion tube (19). When the lifting ring sleeve (16) is close to the insertion tube (19), the lifting ring sleeve (16) and the intermediate tube (9) form a discharge ring cavity (21) that communicates with the buffer cavity (5). The side wall of the insertion tube (19) is provided with a discharge hole (20) that communicates with the buffer cavity (5).

4. The integrated plate-shell heat exchanger for both the economizer and the liquid receiver according to claim 3, characterized in that: The inner wall of the insertion tube (19) is provided with a variable diameter ring platform (18), the inner diameter of the variable diameter ring platform (18) is the same as the inner diameter of the limiting ring (15), and chamfered rings are formed on both sides of the variable diameter ring platform (18). The discharge hole (20) is opened through the variable diameter ring platform (18).

5. The integrated plate-shell heat exchanger for both the economizer and the liquid receiver according to claim 1, characterized in that: The condenser connecting pipe (8) includes a main pipe (221) and multiple branch pipes (222). The branch pipes (222) are connected to the main pipe (221). The branch pipes (222) are arranged in a circumferential array on the periphery of the housing. The cold cavity (14) at the end away from the main circuit connecting pipe (10) is connected to the multiple branch pipes (222).

6. The integrated plate-shell heat exchanger for both the economizer and the liquid receiver according to claim 1, characterized in that: The housing has an installation cavity (40) inside. The heat exchange plate group is composed of multiple heat exchange discs (39). The heat exchange discs (39) are inserted into the installation cavity (40). The side wall of the installation cavity (40) has multiple sliding grooves (27) along the depth direction of the installation cavity (40). The sliding grooves (27) are slidably connected to limit baffles (29). The limit baffles (29) are used to limit the position of the heat exchange discs (39). Two sliding cylinders (31) are provided on both sides of the limit baffles (29). Limiting sliding grooves (30) that slide with the sliding cylinders (31) are provided on both sides of the sliding grooves (27). The limiting groove (30) includes multiple limiting areas (301), ejection areas (302) and sliding areas (303) spaced apart. The limiting area (301) engages and restricts the movement of two sliding cylinders (31), and is used to lock the limiting baffle (29) and press the heat exchange disc (39). An ejection block (28) is slidably connected in the ejection area (302). The bottom of the ejection block (28) is provided with an ejection spring (24) for pushing the ejection block (28) to move closer to the heat exchange disc (39). The ejection block (28) is used to ensure that the sliding cylinder (31) moves from the limiting area (301) to the sliding area (303).

7. A plate-and-shell heat exchanger integrating an economizer and a liquid receiver according to claim 6, characterized in that: The sliding groove (27) has a reset cavity on its opposite sides that slides and cooperates with the sliding cylinder (31). The reset cavity includes a vertically opened moving groove (23) and connecting grooves (25) on both sides of the moving groove (23). The connecting grooves (25) are connected to the upper and lower ends of the limiting sliding groove (30).

8. A plate-and-shell heat exchanger integrating an economizer and a liquid receiver according to claim 7, characterized in that: Locking slots (26) are provided on both sides of the heat exchange disc (39) near the top plate (1). The locking slots (26) are engaged with the limiting baffle (29). A locking block (33) is telescopically connected to the side wall of the connecting groove (25). A locking spring (32) is provided at the bottom of the locking block (33) for pushing the locking block (33). When the locking block (33) is pushed out, it is used to press the limiting baffle (29).

9. A plate-and-shell heat exchanger integrating an economizer and a liquid receiver according to claim 1, characterized in that: The buffer cavity (5) is provided with a compression plate (35). The compression plate (35) has an intermediate hole that is inserted into the intermediate tube (9). The intermediate tube (9) is fitted with an intermediate compression spring (34) for pushing the compression plate (35). A limiting protrusion ring (36) is provided at one end of the intermediate tube (9) near the main circuit connecting pipe (10). The limiting protrusion ring (36) is used to limit the movement distance of the compression plate (35).

10. A plate-and-shell heat exchanger integrating an economizer and a liquid receiver according to claim 9, characterized in that: A filling arc block (37) is rotatably connected to the extrusion plate (35). The filling arc block (37) is eccentrically disposed on the extrusion plate (35) and abuts against the inner wall of the buffer cavity (5).

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