Heat pump drying device and single-cold variable-capacity heat pump drying system

Abstract

The embodiment of the application provides a heat pump drying device and a single-cold variable-capacity heat pump drying system, and relates to the technical field of heat pumps. The intermediate heat exchanger assembly comprises an intermediate heat exchanger, a four-way valve and an electronic expansion valve, four interfaces of the four-way valve are connected with the intermediate heat exchanger, the electronic expansion valve, an outlet of the condenser and an inlet of the evaporator, an exhaust pipe of the compressor is connected with the inlet of the condenser, and an outlet of the evaporator is connected with a suction pipe of the compressor; a first port of the intermediate heat exchanger is connected with the four-way valve, a second port of the intermediate heat exchanger is connected with the four-way valve through the electronic expansion valve, the intermediate heat exchanger comprises a flow path assembly, and when refrigerant flows from the second port to the first port, the refrigerant is distributed to all flow paths of the flow path assembly; and when the refrigerant flows from the first port to the second port, the refrigerant is distributed to part of the flow paths of the flow path assembly. The heat pump drying device can realize the technical effects of reducing energy consumption and improving heat exchange efficiency.

Description

Technical Field

[0001] This application relates to the field of heat pump technology, and more specifically, to a heat pump drying device and a single-cooling variable-capacity heat pump drying system. Background Technology

[0002] Currently, heat pump technology is the most efficient way to save energy during the drying process of clothes, and therefore it has been widely used. For example, in the drying stage, a heat pump dryer can dehumidify and cool the evaporator of the heat pump system, treating the hot and humid air at the drum outlet into dry and cold air, which is then heated by the condenser to become the required dry and hot air before entering the drum for drying.

[0003] In existing technologies, single-cooling variable-capacity heat pump drying systems can select different operating modes for optimal energy efficiency at different drying stages. For example, an existing staged dehumidification heat pump dryer adds an intermediate heat exchanger to adapt to the different dehumidification and heating needs of the drying system at different stages of drying: In the early stage of drying, the moisture content of the clothes is at its highest, and the dehumidification efficiency is very high. A throttling valve is used to regulate this, simultaneously performing pre-cooling and dehumidification to maximize the handling of the moisture load in the early stages of dehumidification. In the later stage of drying, the moisture content is lower, and the dehumidification efficiency is relatively low. At this time, temperature has a greater impact on drying efficiency than humidity. Therefore, a throttling valve is used to increase the condenser area and raise the outlet air temperature, achieving the goal of zoned control of drying efficiency. However, in this control scheme, the intermediate heat exchanger needs to switch between condenser and evaporator at different times through a throttling valve. However, the heat exchange requirements of the heat exchanger are not consistent for condensation and evaporation, resulting in high energy consumption and low heat exchange efficiency. Summary of the Invention

[0004] The purpose of this application is to provide a heat pump drying device and a single-cooling variable-capacity heat pump drying system, which can achieve the technical effects of reducing energy consumption and improving heat exchange efficiency.

[0005] In a first aspect, embodiments of this application provide a heat pump drying device, including: a compressor, a condenser, an intermediate heat exchanger assembly, and an evaporator; The intermediate heat exchanger assembly includes an intermediate heat exchanger, a four-way valve, and an electronic expansion valve. The four ports of the four-way valve are respectively connected to the intermediate heat exchanger, the electronic expansion valve, the outlet of the condenser, and the inlet of the evaporator. The exhaust pipe of the compressor is connected to the inlet of the condenser, and the outlet of the evaporator is connected to the suction pipe of the compressor. The first port of the intermediate heat exchanger is connected to the four-way valve, and the second port of the intermediate heat exchanger is connected to the four-way valve through the electronic expansion valve. The intermediate heat exchanger includes a flow path assembly. When the refrigerant flows from the second port to the first port, the refrigerant is distributed to all the flow paths of the flow path assembly. When the refrigerant flows from the first port to the second port, the refrigerant is distributed to a portion of the flow paths of the flow path assembly.

[0006] In the above-mentioned process, the heat pump drying device adds an intermediate heat exchanger between the condenser and the evaporator to adapt to the different dehumidification and heating requirements of the drying system at different stages of drying. In this heat pump drying device, the intermediate heat exchanger needs to switch between the condenser and the evaporator at different times. During the switching, the refrigerant flow direction of the intermediate heat exchanger can be adjusted by a four-way valve to meet the operating conditions of the intermediate heat exchanger under different load requirements, thereby reducing energy consumption and improving heat exchange efficiency. Thus, the heat pump drying device can achieve the technical effects of reducing energy consumption and improving heat exchange efficiency.

[0007] Furthermore, the outlet of the condenser is connected to the D-tube of the four-way valve, and the S-tube of the four-way valve is connected to the inlet of the evaporator.

[0008] Furthermore, the intermediate heat exchanger assembly also includes a first one-way valve and a second one-way valve, wherein the first one-way valve is disposed at a first port of the intermediate heat exchanger and the second one-way valve is disposed at a second port of the intermediate heat exchanger.

[0009] Furthermore, the intermediate heat exchanger assembly also includes a liquid collector, which is connected to the second one-way valve.

[0010] In the above process, the refrigerant collection and redistribution functions of each flow path of the intermediate heat exchanger are realized through the liquid collector, and the refrigerant flow direction of the intermediate heat exchanger is adjusted.

[0011] Furthermore, the flow path assembly includes a first flow path, a second flow path, and a third flow path, wherein one end of the first flow path is connected to the outlet of the first check valve, and the other end is connected to the liquid collector; One end of the second flow path is connected to the inlet of the first one-way valve, and the other end is connected to the liquid collector; One end of the third flow path is connected to the inlet of the first check valve, and the other end is connected to the inlet of the second check valve. The outlet of the second check valve is connected to the liquid collector.

[0012] Furthermore, the D and E pipes of the four-way valve are open, the S and C pipes of the four-way valve are open, and the refrigerant flow direction between the condenser and the evaporator is as follows: The refrigerant flows out from the outlet of the condenser, enters through the D pipe of the four-way valve, flows out through the E pipe, enters the liquid collector after passing through the first part of the flow path, is distributed by the liquid collector to the second part of the flow path, merges into the third part of the flow path, passes through the electronic expansion valve for throttling, enters through the C pipe of the four-way valve, flows out through the S pipe, and enters the evaporator.

[0013] In the above process, due to the presence of the first one-way valve, one-way conduction is not possible, so the refrigerant can only be distributed to the first part of the flow path and pass through the liquid collector; due to the presence of the second one-way valve, one-way conduction is not possible, so the refrigerant is distributed from the liquid collector to the second part of the flow path, merges and then flows out as a whole in the third part of the flow path, passes through the electronic expansion valve for throttling, enters through the C pipe of the four-way valve and flows out through the S pipe, and enters the evaporator at the rear end; thus, when the intermediate heat exchanger is used as a condenser, fewer branches are required to improve the heat transfer coefficient.

[0014] Furthermore, the D and C pipes of the four-way valve are open, the E and S pipes of the four-way valve are open, and the refrigerant flow direction between the condenser and the evaporator is as follows: The refrigerant flows out from the outlet of the condenser, enters through the D pipe of the four-way valve, flows out through the C pipe, passes through the electronic expansion valve for throttling, and enters the intermediate heat exchanger. The first one-way valve and the second one-way valve are open in one direction, and the refrigerant is evenly distributed to each flow path of the flow path assembly, converges into the E pipe of the four-way valve, flows out through the S pipe of the four-way valve, and enters the evaporator.

[0015] In the above process, the high-temperature and high-pressure refrigerant from the condenser enters through pipe D of the four-way valve and flows out through pipe C. After being throttled by the electronic expansion valve, it enters the intermediate heat exchanger. At this time, the first and second one-way valves are open in one direction, and the refrigerant is evenly distributed to each flow path. It then converges into pipe E of the four-way valve and flows out through pipe S of the four-way valve, entering the evaporator. Thus, when the intermediate heat exchanger is used as an evaporator, a larger number of branches is achieved to balance the heat transfer coefficient and the heat transfer temperature difference.

[0016] Furthermore, the device also includes a gas collection pipe, through which the four-way valve is connected to the intermediate heat exchanger.

[0017] Furthermore, the device also includes a drying mechanism, which is connected to the condenser and the evaporator respectively.

[0018] Secondly, embodiments of this application also provide a single-cooling variable-capacity heat pump drying system, including the heat pump drying device as described in any of the first aspects.

[0019] Other features and advantages disclosed in this application will be set forth in the following description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing the above-described technology disclosed in this application.

[0020] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the heat pump drying device provided in the embodiments of this application; Figure 2 This is a schematic diagram of the structure of the four-way valve and intermediate heat exchanger provided in the embodiments of this application.

[0023] Icons: Compressor 100; Condenser 200; Intermediate heat exchanger assembly 300; First check valve 310; Second check valve 320; Intermediate heat exchanger 330; First flow path 331; Second flow path 332; Third flow path 333; Fourth flow path 334; Fifth flow path 335; Sixth flow path 336; Four-way valve 340; Electronic expansion valve 350; Liquid collector 360; Evaporator 400; Drying mechanism 600. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0025] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0026] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0027] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or a point connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0028] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0029] This application provides a heat pump drying device and a single-cooling variable-capacity heat pump drying system, which can be applied to heat pump drying processes. The heat pump drying device adds an intermediate heat exchanger between the condenser and evaporator to adapt to the different dehumidification and heating requirements of the drying system at different stages of drying. In this heat pump drying device, the intermediate heat exchanger needs to switch between the condenser and evaporator at different times. During switching, the refrigerant flow direction of the intermediate heat exchanger can be adjusted via a four-way valve, thereby meeting the operating conditions of the intermediate heat exchanger under different load requirements, reducing energy consumption while improving heat exchange efficiency. Therefore, this heat pump drying device can achieve the technical effects of reducing energy consumption and improving heat exchange efficiency.

[0030] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the heat pump drying device provided in the embodiments of this application. Figure 2This is a schematic diagram of the structure of the four-way valve and intermediate heat exchanger provided in the embodiments of this application; wherein, the heat pump drying device includes: compressor 100, condenser 200, intermediate heat exchanger assembly 300 and evaporator 400.

[0031] For example, the intermediate heat exchanger assembly 300 includes a first one-way valve 310, a second one-way valve 320, an intermediate heat exchanger 330, a four-way valve 340, and an electronic expansion valve 350. The four-way valve 340 includes a D-tube, an E-tube, an S-tube, and a C-tube.

[0032] For example, a four-way valve (hydraulic valve terminology) is a control valve with four ports. The flow direction of the refrigerant can be adjusted by controlling the opening and closing states of each port of the four-way valve 340. Specifically, the D pipe (discharge pipe) of the four-way valve 340 represents the compressor discharge pipe; the E pipe (evap pipe) represents the pipe connected to the evaporator; the S pipe (suction pipe) represents the pipe connected to the compressor return pipe; and the C pipe (cond pipe) represents the pipe connected to the condenser.

[0033] For example, the discharge pipe of compressor 100 is connected to the inlet of condenser 200, the outlet of condenser 200 is connected to the D pipe of four-way valve 340, the S pipe of four-way valve 340 is connected to the inlet of evaporator 400, and the outlet of evaporator 400 is connected to the suction pipe of compressor 100.

[0034] For example, the first port of the intermediate heat exchanger 330 is connected to the E-tube of the four-way valve 340, and the second port of the intermediate heat exchanger 330 is connected to the C-tube of the four-way valve 340 through the electronic expansion valve 350. The intermediate heat exchanger 330 includes a flow path assembly. A first one-way valve 310 is disposed at the first port of the intermediate heat exchanger 330, and a second one-way valve 320 is disposed at the second port of the intermediate heat exchanger 330. When the refrigerant flows from the second port to the first port, the first one-way valve 310 and the second one-way valve 320 are open, and the refrigerant is distributed to all flow paths of the flow path assembly. When the refrigerant flows from the first port to the second port, the first one-way valve 310 and the second one-way valve 320 are closed, and the refrigerant is distributed to a portion of the flow path assembly.

[0035] In some embodiments, the flow path distribution of the intermediate heat exchanger 330 is as follows: Figure 2 As shown: Taking the intermediate heat exchanger 330 as an example, which uses a 2-row 30-hole heat exchanger, the flow path assembly is divided into 6 flow paths, each with a flow path size of 5U.

[0036] For example, when the intermediate heat exchanger 330 is used as a condenser, since the condenser is not sensitive to pressure drop, it is suitable to have fewer branches to improve the heat transfer coefficient. At this time, the refrigerant can be made to flow from the first port of the intermediate heat exchanger 330 to the second port by adjusting the four-way valve 340. The first one-way valve 310 and the second one-way valve 320 are shut off, and the refrigerant is distributed to part of the flow path of the flow path assembly. When the intermediate heat exchanger 330 is used as an evaporator, since the evaporator is more sensitive to pressure drop, it is suitable to have a larger number of branches to achieve a balance between heat transfer coefficient and heat transfer temperature difference. At this time, the refrigerant can be made to flow from the second port of the intermediate heat exchanger 330 to the first port by adjusting the four-way valve 340. The first one-way valve 310 and the second one-way valve 320 are opened, and the refrigerant is distributed to all the flow paths of the flow path assembly.

[0037] In some embodiments, the heat pump drying device adds an intermediate heat exchanger 330 between the condenser 200 and the evaporator 400 to adapt to the different dehumidification and heating requirements of the drying system at different stages of drying. In this heat pump drying device, the intermediate heat exchanger 330 needs to switch between the condenser and evaporator at different times. During the switching, the refrigerant flow direction of the intermediate heat exchanger 330 can be adjusted by the four-way valve 340, the first one-way valve 310, and the second one-way valve 320, thereby meeting the operating state of the intermediate heat exchanger 330 under different load requirements, reducing energy consumption while improving heat exchange efficiency. Thus, the heat pump drying device can achieve the technical effects of reducing energy consumption and improving heat exchange efficiency.

[0038] For example, the intermediate heat exchanger assembly 300 also includes a liquid collector 360 connected to a second check valve 320.

[0039] For example, the refrigerant collection and refrigerant redistribution functions of each flow path of the intermediate heat exchanger 330 are realized through the liquid collector 360, thereby adjusting the refrigerant flow direction of the intermediate heat exchanger 330.

[0040] For example, the flow path assembly includes a first flow path, a second flow path and a third flow path, with one end of the first flow path connected to the outlet of the first check valve 310 and the other end connected to the liquid collector 360; One end of the second flow path is connected to the inlet of the first one-way valve 310, and the other end is connected to the liquid collector 360; One end of the third flow path is connected to the inlet of the first check valve 310, and the other end is connected to the inlet of the second check valve 320. The outlet of the second check valve 320 is connected to the liquid collector 360.

[0041] In some implementations, such as Figure 2As shown, the intermediate heat exchanger 330 includes six flow paths: a first flow path 331, a second flow path 332, a third flow path 333, a fourth flow path 334, a fifth flow path 335, and a sixth flow path 336. Based on the connection relationship with the first check valve 310 and the second check valve 320, the first part of the flow path includes the first flow path 331, the second flow path 332, and the third flow path 333; the second part of the flow path includes the fourth flow path 334 and the fifth flow path 335; and the third part of the flow path includes the sixth flow path 336.

[0042] For example, when the D and E pipes of the four-way valve 340 are open, and the S and C pipes of the four-way valve are open, the refrigerant flow direction between the condenser 200 and the evaporator 400 is as follows: The refrigerant flows out from the outlet of the condenser 200, enters through the D pipe of the four-way valve 340 and flows out through the E pipe. After passing through the first part of the flow path, it enters the liquid collector 360, is distributed by the liquid collector 360 to the second part of the flow path, and merges into the third part of the flow path. After being throttled by the electronic expansion valve 350, it enters through the C pipe of the four-way valve 340 and flows out through the S pipe, and enters the evaporator 400.

[0043] For example, due to the presence of the first one-way valve 310, one-way conduction is not possible, so the refrigerant can only be distributed to the first part of the flow path (the upper three flow channels) and pass through the liquid collector 360; due to the presence of the second one-way valve 320, one-way conduction is not possible, so the refrigerant is distributed from the liquid collector 360 to the second part of the flow path, merges and then flows out as a whole through the third part of the flow path, is throttled by the electronic expansion valve 350, enters through the C tube of the four-way valve 340 and flows out through the S tube, and enters the evaporator 400 at the rear end; thus, when the intermediate heat exchanger 330 is used as a condenser, fewer branches are required to improve the heat transfer coefficient.

[0044] For example, when the D and C pipes of the four-way valve 340 are open, and the E and S pipes of the four-way valve are open, the refrigerant flow direction between the condenser 200 and the evaporator 400 is as follows: The refrigerant flows out from the outlet of the condenser 200, enters through the D pipe of the four-way valve 340, flows out through the C pipe, passes through the electronic expansion valve 350 for throttling, and enters the intermediate heat exchanger 330. The first one-way valve 310 and the second one-way valve 320 are open in one direction, and the refrigerant is evenly distributed to each flow path of the flow path assembly. It then converges into the C pipe of the four-way valve 340, flows out through the S pipe of the four-way valve 340, and enters the evaporator 400.

[0045] For example, high-temperature and high-pressure refrigerant from condenser 200 enters through pipe D of four-way valve 340 and flows out through pipe C. After being throttled by electronic expansion valve 350, it enters intermediate heat exchanger 330. At this time, first one-way valve 310 and second one-way valve 320 are open in one direction, and the refrigerant is evenly distributed to each flow path. It then converges into pipe E of four-way valve 340 and flows out through pipe S of four-way valve 340, entering evaporator 400. Thus, when intermediate heat exchanger 330 is used as evaporator, a larger number of branches is achieved to balance the heat transfer coefficient and heat transfer temperature difference.

[0046] For example, the heat pump drying device also includes a gas collection pipe, through which a four-way valve 340 is connected to an intermediate heat exchanger 330.

[0047] For example, the heat pump drying device also includes a drying mechanism 600, which is connected to the condenser 200 and the evaporator 400 respectively.

[0048] Exemplary embodiments of this application also provide a single-cooling variable-capacity heat pump drying system, including as follows: Figure 1 and Figure 2 The heat pump drying device shown.

[0049] In some implementation scenarios, combined with Figures 1 to 2 The heat pump drying device and single-cooling variable-capacity heat pump drying system provided in this application embodiment require the intermediate heat exchanger 330 to be throttled and regulated by the electronic expansion valve 350 as a throttling valve at different times to switch between the condenser and evaporator. However, the heat exchange requirements of the intermediate heat exchanger 330 are different for condensation and evaporation. Therefore, the intermediate heat exchanger 330 needs to be designed separately to meet the optimal operating conditions under different load requirements.

[0050] For example, the heat pump drying device provided in this application embodiment, under the premise of a single-cooling machine and a constant refrigerant flow direction, utilizes a variable flow heat exchanger to achieve energy-saving and high-efficiency technical effects; wherein, the inlet of the intermediate heat exchanger 330 is from the front-end condenser 200, and the outlet is connected to the rear-end evaporator 400: 1. When the intermediate heat exchanger 330 is used as a condenser, the high-temperature and high-pressure refrigerant from the front-end condenser 200 enters through the D pipe of the four-way valve 340 (at this time, the four-way valve 340 is in the OFF state, and the C pipe and the S pipe are interconnected). The refrigerant flowing out through the E pipe passes through the gas collecting pipe. Due to the presence of the first one-way valve 310, one-way conduction is not possible. Therefore, the refrigerant can only be distributed to the upper three flow channels (first flow path 331, second flow path 332, and third flow path 333). After passing through the liquid collector 360, due to the presence of the second one-way valve 320, one-way conduction is not possible. The refrigerant is then distributed from the liquid collector 360 to the fourth and fifth flow channels (fourth flow path 334 and fifth flow path 335). After merging, it flows out as a whole from the sixth flow channel (sixth flow path 336). After being throttled by the electronic expansion valve 350, it enters through the C pipe and flows out through the S pipe of the four-way valve 340, and enters the rear-end evaporator 400. 2. When the intermediate heat exchanger 330 is used as an evaporator, the four-way valve 340 is switched to the ON state. At this time, the high-temperature and high-pressure refrigerant from the front-end condenser 200 enters through the D pipe of the four-way valve 340, flows out through the C pipe, and enters the intermediate heat exchanger 330 after being throttled by the electronic expansion valve 350. At this time, the first one-way valve 310 and the second one-way valve 320 are open in one direction, and the refrigerant is evenly distributed to the 6 flow paths. After being merged through the gas collecting pipe, it enters the rear-end evaporator 400 through the E pipe and the S pipe of the four-way valve 340.

[0051] For example, the heat pump drying device and single-cooling variable capacity heat pump drying system provided in the embodiments of this application can achieve variable fusion of the differences between the evaporation and condensation flow paths, and synergistically improve the heating and cooling capacity of the heat pump air conditioner, thereby improving the annual performance factor (APF).

[0052] In all embodiments of this application, "large" and "small" are relative terms, "more" and "less" are relative terms, and "upper" and "lower" are relative terms. The embodiments of this application will not elaborate further on the expression of such relative terms.

[0053] It should be understood that the phrases "in this embodiment," "in this application embodiment," or "as an optional implementation" throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in this embodiment," "in this application embodiment," or "as an optional implementation" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also understand that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to this application.

[0054] In the various embodiments of this application, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0055] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims.

Claims

1. A heat pump drying device, characterized in that, include: Compressor, condenser, intermediate heat exchanger assembly and evaporator; The intermediate heat exchanger assembly includes an intermediate heat exchanger, a four-way valve, and an electronic expansion valve. The four ports of the four-way valve are respectively connected to the intermediate heat exchanger, the electronic expansion valve, the outlet of the condenser, and the inlet of the evaporator. The exhaust pipe of the compressor is connected to the inlet of the condenser, and the outlet of the evaporator is connected to the suction pipe of the compressor. The first port of the intermediate heat exchanger is connected to the four-way valve, and the second port of the intermediate heat exchanger is connected to the four-way valve through the electronic expansion valve. The intermediate heat exchanger includes a flow path assembly. When the refrigerant flows from the second port to the first port, the refrigerant is distributed to all the flow paths of the flow path assembly. When the refrigerant flows from the first port to the second port, the refrigerant is distributed to a portion of the flow paths of the flow path assembly.

2. The heat pump drying device according to claim 1, characterized in that, The device also includes a drying mechanism, which is connected to the condenser and the evaporator respectively.

3. The heat pump drying device according to claim 1, characterized in that, The device also includes a gas collection pipe, through which the four-way valve is connected to the intermediate heat exchanger.

4. The heat pump drying device according to claim 1, characterized in that, The outlet of the condenser is connected to the D-tube of the four-way valve, and the S-tube of the four-way valve is connected to the inlet of the evaporator.

5. The heat pump drying device according to claim 1, characterized in that, The intermediate heat exchanger assembly further includes a first one-way valve and a second one-way valve, wherein the first one-way valve is disposed at a first port of the intermediate heat exchanger and the second one-way valve is disposed at a second port of the intermediate heat exchanger.

6. The heat pump drying device according to claim 5, characterized in that, The intermediate heat exchanger assembly also includes a liquid collector, which is connected to the second one-way valve.

7. The heat pump drying device according to claim 6, characterized in that, The flow path assembly includes a first flow path, a second flow path, and a third flow path. One end of the first flow path is connected to the outlet of the first one-way valve, and the other end is connected to the liquid collector. One end of the second flow path is connected to the inlet of the first one-way valve, and the other end is connected to the liquid collector; One end of the third flow path is connected to the inlet of the first check valve, and the other end is connected to the inlet of the second check valve. The outlet of the second check valve is connected to the liquid collector.

8. The heat pump drying device according to claim 7, characterized in that, The D and E pipes of the four-way valve are open, the S and C pipes of the four-way valve are open, and the refrigerant flow direction between the condenser and the evaporator is as follows: The refrigerant flows out from the outlet of the condenser, enters through the D pipe of the four-way valve, flows out through the E pipe, enters the liquid collector after passing through the first part of the flow path, is distributed by the liquid collector to the second part of the flow path, merges into the third part of the flow path, passes through the electronic expansion valve for throttling, enters through the C pipe of the four-way valve, flows out through the S pipe, and enters the evaporator.

9. The heat pump drying device according to claim 7, characterized in that, The D and C pipes of the four-way valve are open, and the E and S pipes of the four-way valve are also open. The refrigerant flow direction between the condenser and the evaporator is as follows: The refrigerant flows out from the outlet of the condenser, enters through the D pipe of the four-way valve, flows out through the C pipe, passes through the electronic expansion valve for throttling, and enters the intermediate heat exchanger. The first one-way valve and the second one-way valve are open in one direction, and the refrigerant is evenly distributed to each flow path of the flow path assembly, converges into the E pipe of the four-way valve, flows out through the S pipe of the four-way valve, and enters the evaporator.

10. A single-cooling variable-capacity heat pump drying system, characterized in that, Includes the heat pump drying apparatus as described in any one of claims 1 to 9.

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