Heat exchange assembly and heat pump unit

Abstract

The application provides a heat exchange assembly and a heat pump unit. The heat exchange assembly comprises a shell, a liquid distributor arranged in the shell and forming a liquid distribution cavity inside the liquid distributor, a first communication pipe arranged on the shell, a first end of the first communication pipe being in communication with the outside of the shell, a second end being in communication with the liquid distribution cavity, and a communication hole arranged on the first communication pipe and in communication with the inside of the shell. The heat exchange assembly and the heat pump unit provided by the application can send gaseous refrigerant under a condensing condition into the liquid distributor through the first communication pipe, and the gaseous refrigerant can flow to the lower part of the liquid distributor, thereby effectively avoiding the blockage of the gaseous refrigerant by the liquid distributor and the liquid blocking plate in the heat exchanger in the prior art, effectively improving the contact ability of the gaseous refrigerant with the heat exchange pipe, and achieving the purpose of improving the heat exchange efficiency of the heat exchange assembly.

Description

Technical Field

[0001] This invention relates to the field of heat exchange equipment technology, and in particular to a heat exchange component and a heat pump unit. Background Technology

[0002] Among the heat exchanger types used in large commercial chillers, falling film heat exchangers are favored in evaporation mode due to their high heat exchange efficiency, low charge volume, and convenient maintenance. However, in condensation mode, gaseous refrigerant can only enter from the top of the heat exchanger and is blocked by the top distributor. The gaseous refrigerant entering from the top inlet is blocked by the distributor and baffle, and must bypass the distributor and baffle before flowing to the heat exchange tubes for heat exchange. Therefore, a dead zone for gas phase flow is formed between the distributor and the baffle (see...). Figure 1 The area within the dashed box (in the middle) is where the heat exchange tubes located in the dead zone of gas flow cannot repeatedly contact the gaseous refrigerant, resulting in poor condensation and severely affecting the heat exchanger's heat exchange efficiency under condensation conditions, thus causing the heat exchanger to have low heat exchange efficiency. Summary of the Invention

[0003] To address the technical problem of low heat exchange efficiency of existing falling film heat exchangers under condensing conditions, a heat exchange component and heat pump unit are provided that utilize a first connecting pipe to send gaseous refrigerant under condensing conditions into a liquid distributor, and allow the liquid distributor to directly contact the heat exchange tubes for heat exchange, thereby improving the heat exchange effect.

[0004] A heat exchange assembly, comprising:

[0005] case;

[0006] A liquid distributor is disposed within the housing, and a liquid distribution chamber is formed inside the liquid distributor;

[0007] A first connecting pipe is disposed on the housing, with a first end connected to the outside of the housing and a second end connected to the liquid distribution chamber.

[0008] The first connecting pipe is provided with a connecting hole, which communicates with the interior of the shell.

[0009] The heat exchange assembly further includes a one-way flow structure, which is disposed inside the first connecting pipe and located between the connecting hole and the second end. The connection direction of the one-way flow structure is from the first end to the second end.

[0010] The heat exchange assembly further includes a filter structure disposed between the liquid distributor and the housing, and the filter structure and the liquid distributor divide the interior of the housing into a connecting cavity and a heat exchange cavity, the connecting cavity being located above the heat exchange cavity, and the connecting hole communicating with the connecting cavity.

[0011] The heat exchange assembly also includes heat exchange tubes, which are evenly distributed within the heat exchange cavity.

[0012] The heat exchange assembly further includes a liquid-blocking structure disposed within the heat exchange cavity, which divides the heat exchange cavity into a falling film zone and a filtration zone. The lower end of the liquid-blocking structure has a gap with the shell, and the falling film zone and the filtration zone are connected through the gap. The heat exchange tubes are evenly distributed within the falling film zone.

[0013] The liquid-blocking structure includes at least two baffles. The upper end of the baffle is connected to the connection position between the filter structure and the liquid distributor. The lower end of the baffle forms the gap with the housing. All the baffles and the liquid distributor together form the falling film area.

[0014] The heat exchange assembly also includes an evaporation inlet pipe, one end of which is connected to the outside of the shell and the other end is connected to the liquid distribution chamber, and a throttling structure is provided inside the evaporation inlet pipe.

[0015] The heat exchange assembly also includes a gas supply pipe, one end of which is connected to the outside of the shell and the other end is connected to the liquid distribution chamber, and the gas supply pipe and the evaporation liquid inlet pipe exchange heat with each other.

[0016] The heat exchange assembly also includes a return gas structure, which is disposed above the liquid distributor. A return gas chamber is formed inside the return gas structure and is connected to the liquid distribution chamber. The end of the gas supply pipe is located inside the return gas chamber.

[0017] The lower end of the gas return structure is provided with an opening, the gas return chamber is connected to the liquid distribution chamber through the opening, and the end of the gas replenishment pipe extends into the gas return chamber through the opening.

[0018] The air supply pipe is equipped with an on / off structure;

[0019] The heat exchange component has both evaporation and condensation modes:

[0020] When the heat exchange component is in evaporation mode, the on / off structure is in a connected state;

[0021] When the heat exchange component is in condensation mode, the on / off structure is in the off state.

[0022] The evaporation inlet pipe includes a heat exchange section, and part of the gas supply pipe is located within the heat exchange section.

[0023] The air supply pipe located within the heat exchange section is provided with fins.

[0024] The liquid distributor includes a liquid distributor shell and at least two liquid equalization plates. All the liquid equalization plates are arranged side by side in a vertical direction, and the uppermost liquid equalization plate and the liquid distributor shell together form a liquid distribution cavity.

[0025] The liquid distribution plate is provided with flow holes, and the flow holes on adjacent liquid distribution plates are staggered.

[0026] A heat pump unit includes the heat exchange components described above.

[0027] The heat exchange assembly and heat pump unit provided by this invention utilize a first connecting pipe to deliver gaseous refrigerant under condensation conditions into a distributor. The gaseous refrigerant can flow through the distributor to its lower portion, effectively avoiding the obstruction of the gaseous refrigerant by the distributor and baffles in existing heat exchangers. This eliminates dead zones in the gas phase flow inside the casing, effectively improving the contact between the gaseous refrigerant and the heat exchange tubes, thereby increasing the heat exchange efficiency of the heat exchange assembly. Furthermore, since the gaseous refrigerant is delivered to the heat exchange tubes after passing through the distributor, the distributor can evenly distribute the gaseous refrigerant, ensuring uniform flow to the heat exchange tubes, further improving the heat exchange efficiency between the heat exchange tubes and the gaseous refrigerant, and ultimately enhancing the overall heat exchange efficiency of the heat exchange assembly. When the heat exchanger is in evaporation mode, the gaseous refrigerant generated inside the shell can enter the first connecting pipe through the connecting hole and eventually be discharged from the shell, ensuring the reliable operation of the heat exchanger in evaporation mode. That is, the first connecting pipe acts as an evaporation exhaust pipe when the heat exchange component is in evaporation mode, and as a condensation intake pipe when the heat exchange component is in condensation mode, effectively reducing the number of openings on the shell and reducing the structural complexity and space occupation of the heat exchange component. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a falling film heat exchanger in the prior art;

[0029] Figure 2 This is a schematic diagram of the structure of the heat exchange component provided in an embodiment of the present invention;

[0030] Figure 3 This is another structural schematic diagram of the heat exchange component provided in an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of refrigerant flow in a condensation condition for a heat exchange component provided in an embodiment of the present invention.

[0032] Figure 5 A partial structural diagram of the evaporation inlet pipe and the gas supply pipe provided in an embodiment of the present invention;

[0033] In the picture:

[0034] 1. Shell; 2. Liquid distributor; 21. Liquid distribution chamber; 3. First connecting pipe; 31. First end; 32. Second end; 33. Connecting hole; 34. Unidirectional flow structure; 4. Filtration structure; 11. Connecting cavity; 12. Heat exchange cavity; 5. Heat exchange tube; 121. Falling film zone; 122. Filtration zone; 6. Baffle; 22. Liquid equalization plate; 7. Evaporation inlet pipe; 8. Gas supply pipe; 81. On / off structure; 71. Heat exchange section; 72. Throttling structure; 9. Gas return structure. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0036] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0037] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate for the embodiments of the invention described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0038] It should be noted that in the description of this invention, terms such as "upper," "lower," "left," "right," "inner," and "outer," indicating directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] Existing falling film heat exchangers include a shell, a liquid distributor, and heat exchange tubes. Both the liquid distributor and heat exchange tubes are located inside the shell, with the heat exchange tubes positioned below the liquid distributor. A first and second connecting port are located at the top of the shell, and the liquid distributor is positioned below both the first and second connecting ports. An evaporation inlet pipe is located at the second connecting port. When the falling film heat exchanger is in evaporation mode, liquid refrigerant can flow directly into the liquid distributor through the evaporation inlet pipe, allowing the liquid distributor to distribute the liquid refrigerant. In this case, the first connecting port serves as the evaporation port. At the outlet, the liquid refrigerant distributed by the distributor exchanges heat with the heat exchange tubes and becomes gaseous refrigerant, which is then discharged from the falling film heat exchanger through the first connecting port, completing the evaporation heat exchange process. When the falling film heat exchanger is in condensation mode, the first connecting port acts as the inlet for condensation. The gaseous refrigerant flows into the shell through the first connecting port, and due to the obstruction of the distributor, the gaseous refrigerant can only flow downwards around the distributor, then around the baffle plate before contacting the heat exchange tubes for heat exchange. A gas phase flow dead zone is formed at the connection point between the distributor and the baffle plate (see...). Figure 1 In the area enclosed by the dashed line, gaseous refrigerant has difficulty flowing into the dead zone of gas phase flow. Therefore, the gaseous refrigerant can only exchange heat with the lower heat exchange tubes. The liquid refrigerant formed after heat exchange is discharged from the condensation outlet at the bottom of the shell. Therefore, the heat exchanger in the prior art has the problem of poor heat exchange efficiency. To address this, this application provides... Figures 2 to 5The heat exchange assembly shown includes: a housing 1; a liquid distributor 2 disposed within the housing 1, with a liquid distribution chamber 21 formed inside the liquid distributor 2; a first connecting pipe 3 disposed on the housing 1, with its first end 31 communicating with the outside of the housing 1 and its second end 32 communicating with the liquid distribution chamber 21; and a connecting hole 33 provided on the first connecting pipe 3, communicating with the inside of the housing 1. Gaseous refrigerant under condensation conditions is delivered into the liquid distributor 2 via the first connecting pipe 3. The gaseous refrigerant can flow through the liquid distributor 2 to the area below it, effectively avoiding the obstruction of the gaseous refrigerant by the liquid distributor 2 and baffle plate in the heat exchanger as in the prior art. This eliminates dead zones in the gas phase flow inside the housing 1, effectively improving the contact between the gaseous refrigerant and the heat exchange tubes, thereby increasing the heat exchange efficiency of the heat exchange assembly. Furthermore, since the gaseous refrigerant is delivered to the heat exchange tubes via the distributor 2, the distributor 2 can evenly distribute the gaseous refrigerant, ensuring that it flows uniformly to the heat exchange tubes. This further improves the heat exchange efficiency between the heat exchange tubes and the gaseous refrigerant, thus enhancing the overall heat exchange efficiency of the heat exchange assembly. Because the heat exchanger operates in both evaporation and condensation modes, the evaporation mode requires an evaporation inlet and an evaporation outlet at the top of the shell 1, while the condensation mode requires a condensation inlet at the top of the shell 1. This makes the shell 1 structurally complex. To reduce the structural complexity of the heat exchange assembly, when the heat exchanger is in evaporation mode, the gaseous refrigerant generated inside the shell 1 can enter the first connecting pipe 3 through the connecting hole 33 and ultimately exit the shell 1. This ensures reliable operation of the heat exchanger in evaporation mode. In other words, the first connecting pipe 3 acts as an evaporation exhaust pipe when the heat exchange assembly is in evaporation mode and as a condensation inlet pipe when the heat exchange assembly is in condensation mode. This effectively reduces the number of openings on the shell 1, lowering the structural complexity of the heat exchange assembly and reducing space requirements.

[0041] Since the connecting hole 33 is connected to the first connecting pipe 3, the connecting hole 33 can be connected to both the first end 31 and the second end 32 at the same time. When the heat exchange component is in the evaporation condition, after the gaseous refrigerant generated in the shell 1 flows into the first connecting pipe 3 through the connecting hole 33, some of the gaseous refrigerant will flow back into the liquid distribution chamber 21 through the second end 32, which will reduce the refrigerant discharge of the heat exchanger and reduce the heat exchange efficiency of the heat exchanger. For this reason, the heat exchange component also includes a one-way flow structure 34. The one-way flow structure 34 is disposed in the first connecting pipe 3 and is located between the connecting hole 33 and the second end 32. The communication direction of the one-way flow structure 34 is from the first end 31 to the second end 32. By using the one-way flow structure 34 to restrict the flow direction of the gaseous refrigerant under evaporation conditions, the refrigerant entering through the connecting hole 33 can only exit the shell 1 through the first end 31 when the heat exchange component is in evaporation conditions, thus ensuring the heat exchange efficiency of the heat exchange component. When the heat exchange component is in condensation conditions, the flow velocity of the gaseous refrigerant flowing in from the first end 31 is higher, which can ensure that most of the gaseous refrigerant flows to the second end 32 through the one-way flow structure 34, and only a small part flows out of the first connecting pipe 3 through the connecting hole 33, thus ensuring that the heat exchange component can work reliably under both condensation and evaporation conditions.

[0042] As one implementation, in order to ensure that the gaseous refrigerant can flow to the connecting hole 33 under evaporation conditions, there is a gap between the liquid distributor 2 and the inner wall of the shell 1 to ensure the smooth flow of the gaseous refrigerant, while avoiding liquid droplets entrained in the gaseous refrigerant, which would cause the structure connected to the heat exchange component to suck in liquid. The heat exchange component also includes a filter structure 4, which is disposed between the liquid distributor 2 and the shell 1. The filter structure 4 and the liquid distributor 2 divide the interior of the shell 1 into a connecting cavity 11 and a heat exchange cavity 12. The connecting cavity 11 is located above the heat exchange cavity 12, and the connecting hole 33 communicates with the connecting cavity 11. The gaseous refrigerant is filtered using the filter structure 4, thus avoiding the problem of gaseous refrigerant carrying liquid during evaporation when the heat exchange component is in evaporation mode. It also ensures that when the heat exchange component is in condensation mode, some gaseous refrigerant bypasses the liquid distributor 2 and flows through the filter structure 4 into the heat exchange chamber 12, increasing the amount of gaseous refrigerant at the heat exchange tubes located at the lower part of the shell 1, thereby increasing the heat exchange efficiency of the heat exchange component. Specifically, the heat exchange component also includes heat exchange tubes 5, which are evenly distributed within the heat exchange chamber 12. In evaporation mode, the liquid refrigerant flows to the heat exchange tube 5 through the distribution of the liquid distributor 2 for heat exchange, and then forms a gaseous refrigerant. After passing through the filter structure 4, it flows to the connecting hole 33, then enters the first connecting pipe 3 and is discharged through the first end 31, completing the evaporation heat exchange process. Similarly, in condensation mode, the gaseous refrigerant is divided into two parts. Most of it flows to the heat exchange tube 5 through the distribution of the liquid distributor 2 for heat exchange, and then forms a liquid refrigerant that accumulates in the shell 1. The other part of the gaseous refrigerant enters the connecting cavity 11 through the connecting hole 33, and after passing through the filter structure 4, it flows to the heat exchange cavity 12 to contact the heat exchange tube 5 for heat exchange, forming a liquid refrigerant that accumulates in the shell 1. The liquid refrigerant accumulated at the bottom of the shell 1 is discharged through the condensate outlet, completing the condensation heat exchange process.

[0043] To improve the heat exchange efficiency of the heat exchange assembly, the heat exchange assembly also includes a liquid-blocking structure. This liquid-blocking structure is disposed within the heat exchange chamber 12 and divides the heat exchange chamber 12 into a falling film zone 121 and a filtration zone 122. A gap exists between the lower end of the liquid-blocking structure and the housing 1. The falling film zone 121 and the filtration zone 122 are connected through this gap. The heat exchange tubes 5 are evenly distributed within the falling film zone 121. The liquid-blocking structure restricts the flow of refrigerant within the heat exchange chamber 12. Under evaporation conditions, the liquid refrigerant first flows into the falling film zone 121 and exchanges heat with the heat exchange tubes 5. The liquid-blocking structure forces the refrigerant to complete the heat exchange with the heat exchange tubes 5 before it flows into the filtration zone 122. This prevents the liquid refrigerant from directly entering the filtration zone 122 and increasing the problem of gaseous refrigerant carrying liquid, thereby ensuring the working efficiency of the heat exchange assembly under evaporation conditions. Specifically, the liquid-blocking structure includes at least two baffles 6. The upper end of the baffle 6 is connected to the connection position between the filter structure 4 and the liquid distributor 2. The lower end of the baffle 6 forms the gap between it and the housing 1. All the baffles 6 and the liquid distributor 2 together form the falling film area 121.

[0044] The liquid distributor 2 includes a distributor housing and at least two layers of liquid equalization plates 22. All the liquid equalization plates 22 are arranged side by side in a vertical direction, and the uppermost liquid equalization plate 22 and the distributor housing together form a liquid distribution cavity 21. The distribution of liquids by multiple layers of liquid equalization plates 22 is improved. Especially under condensation conditions, after the gaseous refrigerant enters the liquid equalization cavity, the flow holes on the liquid equalization plates 22 will have a throttling effect on the gaseous refrigerant, thereby improving the heat exchange efficiency of the heat exchange components under condensation conditions. The liquid equalization plates 22 are provided with flow holes, and the flow holes on adjacent layers of liquid equalization plates 22 are staggered. The staggered flow holes further improve the liquid distribution effect of the liquid distributor 2. Figure 2 As shown, the liquid distributor 2 includes a top arc plate, an uppermost liquid distribution plate 22, and side sealing plates. The top arc plate, liquid distribution plate 22, and side sealing plates together form a liquid distribution chamber. The filter structure 4 is in the same plane as the liquid distribution plate 22, and the upper end of the baffle 6 is connected to the connection position between the filter structure 4 and the liquid distribution plate 22. The central axis of the top arc plate is collinear with the central axis of the housing 1 above the liquid distributor 2, forming an annular connecting cavity 11 above the housing 1. This allows the gaseous refrigerant flowing in the connecting cavity 11 to flow smoothly, reducing resistance and improving the heat exchange efficiency of the heat exchange components.

[0045] The heat exchange assembly also includes an evaporation inlet pipe 7, one end of which is connected to the outside of the housing 1 and the other end is connected to the liquid distribution chamber 21. A throttling structure 72 is provided inside the evaporation inlet pipe 7. When the heat exchange assembly is in evaporation mode, the evaporation inlet pipe 7 is used to feed liquid refrigerant into the liquid distribution chamber 21. Under the throttling effect of the throttling structure 72, the refrigerant forms a vapor-liquid coexisting state where gaseous and liquid refrigerants coexist. The vapor-liquid coexisting state refrigerant enters the liquid distribution chamber 21. Under the action of gravity, the liquid refrigerant and gaseous refrigerant separate. The liquid refrigerant will collect on the liquid distribution plate 22 and flow through the liquid distribution holes on the liquid distribution plate 22 to the heat exchange tube 5 below the liquid distributor 2 for heat exchange, thereby realizing the heat exchange process of the heat exchange assembly. The gaseous refrigerant after heat exchange at the heat exchange tube 5 flows through the filter structure 4 to the connecting hole 33 and is finally discharged through the first end 31 of the first connecting pipe 3. The heat exchange assembly completes the evaporation heat exchange process. Since the refrigerant undergoes gas-liquid separation within the liquid distribution chamber 21, producing a portion of gaseous refrigerant, the heat exchange assembly further includes a gas replenishment pipe 8 to fully utilize this gaseous refrigerant. One end of the gas replenishment pipe 8 is connected to the outside of the housing 1, and the other end is connected to the liquid distribution chamber 21. The gaseous refrigerant separated by the gas replenishment pipe 8 is sent to the compressor connected to the heat exchange assembly for replenishment, improving the compressor's compression efficiency. Simultaneously, the gas replenishment pipe 8 exchanges heat with the evaporator inlet pipe 7. By utilizing the heat exchange between the gaseous refrigerant in the gas replenishment pipe 8 and the liquid refrigerant in the evaporator inlet pipe 7, the temperature of the liquid refrigerant can eliminate the liquid within the gaseous refrigerant, while simultaneously increasing the superheat of the gaseous refrigerant, thereby improving the energy efficiency of the unit where the heat exchange assembly is located. Furthermore, the gaseous refrigerant formed by gas-liquid separation in the liquid distributor 2 has a high temperature. Even if the gaseous refrigerant in the first connecting pipe 3 that is about to flow into the connecting hole 33 is entrained with liquid droplets when it comes into contact with the outer wall of the liquid distributor 2 or the inner wall of the shell 1, the droplets will be evaporated, thereby ensuring the reliability of the gaseous refrigerant at the first end 31 of the first connecting pipe 3 and effectively eliminating the hidden danger of liquid entrainment during gas intake.

[0046] Since the gas supply pipe 8 is connected to the liquid distribution chamber 21, to prevent liquid refrigerant from entering the gas supply pipe 8, the heat exchange assembly also includes a return gas structure 9. The return gas structure 9 is located above the liquid distributor 2, and a return gas chamber is formed inside the return gas structure 9. The return gas chamber is connected to the liquid distribution chamber 21, and the end of the gas supply pipe 8 is located within the return gas chamber. By utilizing the height difference between the return gas chamber and the liquid distribution chamber 21, the entry of liquid refrigerant into the return gas chamber is minimized, thereby achieving the goal of preventing liquid refrigerant from entering the gas supply pipe 8. Figure 2As shown, the lower end of the return gas structure 9 has an opening, through which the return gas chamber communicates with the liquid distribution chamber 21, and the end of the gas supply pipe 8 extends into the return gas chamber through the opening. The gas supply pipe 8 is U-shaped. Gaseous refrigerant needs to flow downward from the return gas chamber into the gas supply pipe 8. After passing through the U-shaped bend, it continues to flow upward. The baffle channel formed between the return gas chamber and the gas supply pipe 8 eliminates liquid refrigerant entrained in the gaseous refrigerant, ensuring reliable gas supply.

[0047] The gas supply pipe 8 is provided with an on / off structure 81; the heat exchange component has an evaporation mode and a condensation mode: when the heat exchange component is in the evaporation mode, the on / off structure 81 is in the connected state, and the gas supply pipe 8 can guide the gaseous refrigerant in the liquid distribution chamber 21 to the corresponding structure (such as the compressor); when the heat exchange component is in the condensation mode, the on / off structure 81 is in the disconnected state. Since the gaseous refrigerant needs to be sent into the liquid distribution chamber 21 in the condensation mode, there is no need for the gas supply pipe 8 to discharge the gaseous refrigerant. Therefore, the on / off structure 81 can be switched to the disconnected state to close the gas supply pipe 8.

[0048] To improve the heat exchange efficiency between the gaseous refrigerant in the gas supply pipe 8 and the liquid refrigerant in the evaporator inlet pipe 7, the evaporator inlet pipe 7 includes a heat exchange section 71, with a portion of the gas supply pipe 8 located within this section. The liquid refrigerant directly exchanges heat through the pipe wall of the gas supply pipe 8, ensuring efficient heat exchange. Preferably, the gas supply pipe 8 located within the heat exchange section 71 is equipped with fins. The fins further enhance the heat exchange efficiency between the gaseous refrigerant in the gas supply pipe 8 and the liquid refrigerant in the evaporator inlet pipe 7.

[0049] Example

[0050] The heat exchange assembly includes left and right water chambers, tube sheet, shell 1, liquid distributor 2, vapor-liquid filter, heat exchange tubes 5, and baffle plate, and as shown in the figure. Figures 2 to 5 The structure is arranged accordingly.

[0051] The first connecting pipe 3 is fully welded and sealed to the shell 1 and the liquid distributor 2. The one-way flow mechanism is a one-way valve, which is set at the second end 32.

[0052] The evaporation inlet pipe 7 and the gas supply pipe 8 exchange heat in the heat exchange section 71.

[0053] The housing 1 of the liquid distributor 2 protrudes upward to form a return gas structure 9. The end of the gas supply pipe 8 is located inside the return gas structure 9, and the on / off structure 81 on the gas supply pipe 8 is a solenoid valve.

[0054] The liquid distributor 2 includes a first liquid distribution plate and a second liquid distribution plate. The first liquid distribution plate, the top arc plate, and the side sealing plate together form a liquid distribution cavity.

[0055] When the heat exchanger is in evaporation mode:

[0056] The solenoid valve opens to connect the gas supply pipe 8. Liquid refrigerant flows through the evaporator inlet pipe 7 to the throttling structure 72, where it undergoes primary throttling to form a vapor-liquid coexisting refrigerant state. It then enters the liquid distribution chamber 21. Due to gravity, the liquid refrigerant collects at the top of the first liquid distribution plate, forming a liquid seal. Vapor-liquid separation is achieved through the height within the liquid distribution chamber 21. The modified atmosphere refrigerant flows out from the gas supply pipe 8 and enters the compressor for gas supply (a one-way valve is installed at the second end 32 of the first connecting pipe 3, preventing flow; gaseous refrigerant can only flow out from the gas supply pipe 8). The flow holes on the first liquid distribution plate function as a secondary throttling orifice plate. The liquid refrigerant, after primary throttling, undergoes secondary throttling through these orifices. Then, influenced by pressure difference and gravity, the refrigerant after secondary throttling flows out from the flow holes of the second liquid distribution plate and is evenly distributed to the surface of the lower heat exchange tube 5 for heat exchange.

[0057] After being homogenized, the liquid refrigerant completely coats the surface of the heat exchange tube 5 and exchanges heat with the fluid inside the tube for evaporation. The unevaporated liquid refrigerant drips onto the next row of heat exchange tubes 5 for layer-by-layer evaporation.

[0058] Because the gaseous refrigerant after evaporation in the heat exchanger of the prior art is prone to carrying liquid droplets into the suction port, resulting in liquid carry-in during suction, the heat exchange component of this application allows the refrigerant to directly enter the liquid distributor 2 after the first stage of throttling. In this state, the refrigerant temperature is relatively high. Even if the gaseous refrigerant flowing through the surface of the liquid distributor 2 carries liquid droplets, the droplets will be evaporated during the flow process and flow out from the first end 31 of the first connecting pipe 3 at the top into the compressor, ensuring the reliable operation of the compressor, simultaneously increasing the superheat of the gas, and effectively eliminating the risk of liquid carry-in during suction.

[0059] High-temperature, high-pressure liquid refrigerant undergoes heat exchange and cooling through the fins outside the make-up gas pipe 8. After passing through the orifice plate, it flashes and cools down, forming a vapor-liquid coexisting refrigerant that enters the liquid distributor 2. The liquid refrigerant is then homogenized through the liquid equalization plates 22, while the gaseous refrigerant returns to the compressor make-up gas pipe 8 through the U-shaped make-up gas pipe 8. The end of the make-up gas pipe 8 forms a baffle channel with the upper inverted cylinder, which can effectively eliminate liquid entrained in the gaseous refrigerant. The middle part of the make-up gas pipe 8 is equipped with heat exchange fins, which exchange heat with the outer fluid, effectively eliminating finer liquid entrained in the gas and simultaneously providing gas superheat, thereby improving the unit's energy efficiency.

[0060] When the heat exchanger is in condensation mode:

[0061] With the solenoid valve closed, gas cannot flow back to the compressor from the gas supply pipe 8. Gaseous refrigerant enters from the first end 31 of the first connecting pipe 3. Since the gas direction is consistent with the flow direction of the one-way valve, the one-way valve plate opens, and the gas entering the distributor 2 is unaffected. The high-temperature, high-pressure gaseous refrigerant enters the distributor 2 through the first connecting pipe 3 and is evenly distributed through the flow holes of each liquid equalization plate 22 of the distributor 2 (due to the high flow velocity of the gaseous refrigerant in the first connecting pipe 3, most of the gaseous refrigerant can be ensured to flow out through the liquid equalization plate of the distributor 2, and a small portion can flow out through the connecting hole 33). This ensures that the gaseous refrigerant flows out evenly from the flow holes, effectively ensuring that the gaseous refrigerant is in full contact with the heat exchange tube 5 and improving the condensation effect of the heat exchanger.

[0062] A heat pump unit includes the heat exchange components described above.

[0063] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A heat exchange component, characterized in that: include: Shell (1); Liquid distributor (2), the liquid distributor (2) is disposed inside the housing (1), and the liquid distributor (2) forms a liquid distribution chamber (21) inside the liquid distributor (2). The first connecting pipe (3) is disposed on the housing (1), the first end (31) of the first connecting pipe (3) is connected to the outside of the housing (1), and the second end (32) is connected to the liquid distribution chamber (21); The first connecting pipe (3) is provided with a connecting hole (33), which is connected to the interior of the shell (1); The heat exchange assembly further includes a one-way flow structure (34), which is disposed in the first connecting pipe (3) and is located between the connecting hole (33) and the second end (32). The connecting direction of the one-way flow structure (34) is from the first end (31) to the second end (32).

2. The heat exchange assembly according to claim 1, characterized in that: The heat exchange assembly further includes a filter structure (4), which is disposed between the liquid distributor (2) and the housing (1). The filter structure (4) and the liquid distributor (2) divide the interior of the housing (1) into a connecting cavity (11) and a heat exchange cavity (12). The connecting cavity (11) is located above the heat exchange cavity (12), and the connecting hole (33) communicates with the connecting cavity (11).

3. The heat exchange component according to claim 2, characterized in that: The heat exchange assembly also includes heat exchange tubes (5), which are evenly distributed within the heat exchange chamber (12).

4. The heat exchange assembly according to claim 3, characterized in that: The heat exchange assembly also includes a liquid-blocking structure, which is disposed in the heat exchange chamber (12) and divides the heat exchange chamber (12) into a falling film zone (121) and a filtration zone (122). The lower end of the liquid-blocking structure has a gap with the shell (1), and the falling film zone (121) and the filtration zone (122) are connected through the gap. The heat exchange tubes (5) are evenly distributed in the falling film zone (121).

5. The heat exchange assembly according to claim 4, characterized in that: The liquid-blocking structure includes at least two baffles (6). The upper end of the baffle (6) is connected to the connection position of the filter structure (4) and the liquid distributor (2). The lower end of the baffle (6) forms the gap between it and the housing (1). All the baffles (6) and the liquid distributor (2) together form the falling film area (121).

6. The heat exchange assembly according to claim 1, characterized in that: The heat exchange assembly also includes an evaporation inlet pipe (7), one end of which is connected to the outside of the shell (1) and the other end is connected to the liquid distribution chamber (21), and a throttling structure (72) is provided inside the evaporation inlet pipe (7).

7. The heat exchange assembly according to claim 6, characterized in that: The heat exchange assembly also includes a gas supply pipe (8), one end of which is connected to the outside of the shell (1) and the other end is connected to the liquid distribution chamber (21), and the gas supply pipe (8) and the evaporation liquid inlet pipe (7) exchange heat with each other.

8. The heat exchange assembly according to claim 7, characterized in that: The heat exchange assembly also includes a return gas structure (9), which is located above the liquid distributor (2). The return gas structure (9) forms a return gas chamber inside the return gas structure (9), which is connected to the liquid distribution chamber (21), and the end of the gas supply pipe (8) is located inside the return gas chamber.

9. The heat exchange assembly according to claim 8, characterized in that: The lower end of the return air structure (9) is provided with an opening, the return air chamber is connected to the liquid distribution chamber (21) through the opening, and the end of the air replenishment pipe (8) extends into the return air chamber through the opening.

10. The heat exchange assembly according to claim 7, characterized in that: The air supply pipe (8) is provided with a switching structure (81); The heat exchange component has both evaporation and condensation modes: When the heat exchange component is in evaporation mode, the on / off structure (81) is in the connected state; When the heat exchange component is in condensation mode, the on / off structure (81) is in the off state.

11. The heat exchange assembly according to claim 7, characterized in that: The evaporation inlet pipe (7) includes a heat exchange section (71), and part of the gas supply pipe (8) is located within the heat exchange section (71).

12. The heat exchange assembly according to claim 11, characterized in that: Fins are provided on the gas supply pipe (8) located in the heat exchange section (71).

13. The heat exchange assembly according to claim 1, characterized in that: The liquid distributor (2) includes a liquid distributor shell and at least two liquid distribution plates (22). All the liquid distribution plates (22) are arranged side by side in the vertical direction, and the uppermost liquid distribution plate (22) and the liquid distributor shell together form a liquid distribution cavity (21).

14. The heat exchange assembly according to claim 13, characterized in that: The liquid leveling plate (22) is provided with flow holes, and the flow holes on two adjacent liquid leveling plates (22) are staggered.

15. A heat pump unit, characterized in that: It includes the heat exchange component according to any one of claims 1 to 14.

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