Heat pump system and drying apparatus

Abstract

The application discloses a heat pump system and a drying equipment. The heat pump system is used for the drying equipment. The heat pump system comprises a compressor, a first condenser, a second condenser and an evaporator. The outlet of the compressor is connected with the inlet of the first condenser. The outlet of the first condenser is connected with the inlet of the second condenser. The outlet of the second condenser is connected with the inlet of the evaporator. The outlet of the evaporator is connected with the inlet of the compressor. The first condenser is arranged on the windward side of the evaporator. The structure of the heat pump system can improve the drying efficiency of the drying equipment in the initial stage of operation, so that the drying time is shortened.

Description

Technical Field

[0001] This application relates to the field of heat pump technology, and in particular to a heat pump system and drying equipment. Background Technology

[0002] Heat pump drying equipment uses the condensation heat of the refrigerant to raise the temperature of the object to be dried, turning the moisture in the object into water vapor. Then, the water vapor is released by the principle of evaporation and dehumidification, thus achieving the drying effect.

[0003] Taking dryers as an example, heat pump dryers have a refrigerant circulation loop and an air circulation loop.

[0004] In the refrigerant circulation loop, the high-pressure gaseous refrigerant discharged from the compressor enters the condenser, is liquefied by the low-temperature air, and flows out of the condenser as liquid refrigerant. After passing through the throttling element, it becomes low-temperature and low-pressure refrigerant, and then enters the evaporator to absorb heat and evaporate into low-temperature and low-pressure vapor, which is then sent to the compressor.

[0005] In the air circulation loop, the high-temperature, low-humidity air, heated by the condenser, enters the dryer drum, carrying away the moisture from the damp clothes in the drum. It then becomes low-temperature, high-humidity air, which flows through the evaporator. The high-humidity air condenses on the relatively low-temperature surface of the evaporator, becoming low-temperature, dry air. It then flows through the condenser again, is heated by the condenser, and is sent back into the drum for the next cycle.

[0006] During operation, the drum temperature of a clothes dryer needs to continuously absorb heat to rise in order to absorb a large amount of moisture when passing through highly humid clothes. After being cooled by the evaporator, a large amount of condensate is released, thus drying the clothes. However, in actual applications, in the early stages of the dryer's operation, the temperature inside the drum is relatively low and cannot rise to the optimal temperature temporarily, resulting in a slower condensation rate during this phase.

[0007] Therefore, how to optimize the heat pump system to improve the drying efficiency of the drying equipment in the initial stage of operation has become a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0008] The purpose of this application is to provide a heat pump system and drying equipment. The structure of the heat pump system can improve the drying efficiency of the drying equipment in the initial stage of operation, thereby shortening the drying time.

[0009] To solve the above-mentioned technical problems, this application provides a heat pump system for drying equipment. The heat pump system includes a compressor, a first condenser, a second condenser, and an evaporator. The outlet of the compressor is connected to the inlet of the first condenser, the outlet of the first condenser is connected to the inlet of the second condenser, the outlet of the second condenser is connected to the inlet of the evaporator, and the outlet of the evaporator is connected to the inlet of the compressor. The first condenser is located on the windward side of the evaporator.

[0010] This application embodiment also provides a drying device, including a drying chamber, an air channel, and a heat pump system. The heat pump system is the heat pump system described above. The evaporator, the first condenser, the second condenser, and the drying chamber are connected through the air channel to form an air circulation loop. The first condenser is arranged near the outlet of the drying chamber, the second condenser is arranged near the inlet of the drying chamber, and the evaporator is located between the first condenser and the second condenser.

[0011] The heat pump system provided in this application embodiment is applied to a drying equipment. The heat pump system is equipped with a first condenser and a second condenser. The first condenser is located on the windward side of the evaporator. When the drying equipment is running, the air flowing out of the drying chamber first passes through the first condenser and then through the evaporator. In this way, the first condenser can reheat the air flowing out of the drying chamber. Compared with the traditional solution, it can increase the heat exchange temperature difference between the heat exchanger and the evaporator, which can improve the heat exchange capacity of the evaporator and accelerate the precipitation of condensate, thereby improving the condensation efficiency and the drying efficiency in the initial stage of the drying equipment operation. This can shorten the drying time, reduce the running time of the heat pump system, and help save energy. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the heat pump system used in the drying equipment in the embodiments provided in this application;

[0013] Figure 2 This is a structural diagram of the evaporator and condenser of the heat pump system provided in the embodiments of this application;

[0014] Figure 3 for Figure 2 The diagram shows the structure of the evaporator and condenser from another perspective.

[0015] Figure 4 This is a structural diagram of the evaporator and the first condenser integrated into one unit in the embodiments provided in this application;

[0016] Figure 5 for Figure 4 The diagram shows the structure of the evaporator and the first condenser from another perspective.

[0017] Explanation of reference numerals in the attached figures:

[0018] Compressor 10, first condenser 21, first condenser inlet 21A, first condenser outlet 21B, second condenser 22, evaporator 30, first evaporation section 31, first evaporation inlet 31A, second evaporation section 32, second evaporation inlet 32A, evaporation outlet 30B, throttling element 40, drying chamber 50, air passage 60;

[0019] 71. Finned plate; 72. Heat exchange tube; 73. T-joint; 74. Two-way joint.

[0020] Pipeline 81, Pipeline 82, Pipeline 83, Pipeline 84. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] For ease of understanding and concise description, the following text will explain the heat pump system and the drying equipment equipped with it together, and the beneficial effects will not be discussed again.

[0023] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the heat pump system used in the drying equipment in the embodiments provided in this application.

[0024] This embodiment provides a heat pump system applied to a drying equipment.

[0025] This embodiment also provides a drying device, which includes a drying chamber 50, an air passage 60, and a heat pump system. The drying device has an air circulation loop and a refrigerant circulation loop.

[0026] The heat pump system provided in this embodiment includes a compressor 50, a first condenser 21, a second condenser 22, and an evaporator 30. The inlet of the compressor 50 is connected to the inlet of the first condenser 21, the outlet of the first condenser 21 is connected to the inlet of the second condenser 22, the outlet of the second condenser 22 is connected to the inlet of the evaporator 30, and the outlet of the evaporator 30 is connected to the inlet of the compressor 50. Thus, the compressor 50, the first condenser 21, the second condenser 22, and the evaporator 30 are connected to form a refrigerant circulation loop.

[0027] In the drying equipment, the drying chamber 50 is connected to the first condenser 21, the second condenser 22 and the evaporator 30 of the heat pump system through the air passage 60, forming an air circulation loop.

[0028] Figure 1In the diagram, hollow arrows indicate the circulation path of air in the air circulation loop, while solid arrows indicate the circulation path of refrigerant in the refrigerant circulation loop.

[0029] In this embodiment, the first condenser 21 is located on the windward side of the evaporator 30, meaning that when air flows in the air circulation loop, it first passes through the first condenser 21 and then through the evaporator 30. The first condenser 21 is arranged near the outlet of the drying chamber 50, and the second condenser 22 is arranged near the inlet of the drying chamber 50. The evaporator 30 is located between the first condenser 21 and the second condenser 22.

[0030] When the drying equipment with the aforementioned heat pump system is in operation, the refrigerant is compressed into a high-temperature, high-pressure gas by the compressor 10, and then becomes a high-temperature liquid after being cooled by the first condenser 21 and the second condenser 22. After entering the evaporator 30, it absorbs heat and evaporates to form a low-temperature, low-pressure steam, which is then sent back to the compressor 10, and so on. The low-humidity air heated by the second condenser 22 enters the drying chamber 50 through the air passage 60. After exchanging heat with the items to be dried in the drying chamber 50, it becomes high-humidity air. The high-humidity air first passes through the first condenser 21 to raise its temperature, and then exchanges heat with the evaporator 30. At this time, the heat exchange temperature is relatively high. The high-humidity air condenses water on the relatively low-temperature surface of the evaporator 30 and becomes low-temperature dry air. Finally, it is heated by the second condenser 22 and sent into the drying chamber 50, and so on, until the items to be dried are dried.

[0031] By adopting the above scheme, a first condenser 21 is added to the windward side of the evaporator 30 of the heat pump system. When the drying equipment is running, the air flowing out of the drying chamber 50 first passes through the first condenser 21 and then through the evaporator 30. In this way, the first condenser 21 is used to reheat the air flowing out of the drying chamber 50. Compared with the traditional scheme, the heat exchange temperature difference between the air and the evaporator 30 can be increased, which can improve the heat exchange capacity of the evaporator 30. The precipitation of condensate is also accelerated, thereby improving the condensation efficiency and the drying efficiency in the initial stage of the drying equipment operation. This can shorten the drying time, reduce the running time of the heat pump system, and help save energy.

[0032] Please refer to this as well. Figures 2 to 5 , Figure 2 This is a structural diagram of the evaporator and condenser of the heat pump system provided in the embodiments of this application. Figure 3 for Figure 2 The diagram shown is a structural representation of the evaporator and condenser from another perspective. Figure 4 This is a structural diagram of the evaporator and the first condenser integrated into one unit in the embodiments provided in this application. Figure 5 for Figure 4 The diagram shows the structure of the evaporator and the first condenser from another perspective.

[0033] In some implementations, the first condenser 21 and the evaporator 30 are integrated into a single structure. This minimizes the size of the heat exchanger in the heat pump system, making the structure more compact, increasing the flexibility in the layout of related components in the drying equipment, and also helping to reduce the overall volume of the drying equipment.

[0034] In practice, both the first condenser 21 and the evaporator 30 are tube-fin heat exchangers. Tube-fin heat exchangers have a larger heat exchange area, enabling higher heat transfer at lower temperature differences. This is more conducive to widening the temperature difference between the humid air and the evaporator 30, and also improves the drying efficiency during the initial operation of the drying equipment. Furthermore, tube-fin heat exchangers have a more compact structure, occupy less space, and allow for more flexible arrangement of related components within the drying equipment.

[0035] The tube-fin heat exchanger includes multiple finned plates 71 and multiple heat exchange tubes 72. The multiple finned plates 71 are arranged at intervals along one direction, and the heat exchange tubes 72 are inserted into the multiple finned plates 71. Two adjacent heat exchange tubes 72 can be connected by a two-way pipe joint 74 so that multiple heat exchange tubes 72 can be connected in sequence. After the refrigerant flows in, it can flow along each heat exchange tube 72 in sequence.

[0036] In the tube-fin heat exchanger where the first condenser 21 and the evaporator 30 are integrated into one unit, the heat exchange tubes 72 of the first condenser 21 and the heat exchange tubes 72 of the evaporator 30 share the same fin plate 71, while the heat exchange tubes 72 of the first condenser 21 and the heat exchange tubes 72 of the evaporator 30 are relatively independent.

[0037] In some embodiments, the evaporator 30 includes a first evaporation section 31 and a second evaporation section 32, which are arranged in parallel between the outlet of the second condenser 22 and the inlet of the compressor 10.

[0038] The first evaporator section 31 and the second evaporator section 32 are integrated into a single structure. This reduces the space occupied by the evaporator 30, making the structure more compact.

[0039] In the scheme where the evaporator 30 is a tube-fin heat exchanger, the heat exchange tubes 72 of the first evaporation section 31 and the heat exchange tubes 72 of the second evaporation section 32 share the fin plate 71. The multiple heat exchange tubes 72 of the first evaporation section 31 can be connected sequentially through a two-way adapter 74, and the multiple heat exchange tubes 72 of the second evaporation section 32 can be connected sequentially through a two-way adapter 74. The multiple heat exchange tubes 72 of the first evaporation section 31 and the multiple heat exchange tubes 72 of the second evaporation section 32 are relatively independent to achieve parallel flow of refrigerant.

[0040] The first evaporation section 31 has a first evaporation inlet 31A, and the second evaporation section 32 has a second evaporation inlet 32A.

[0041] The heat exchange tube 72 with an outlet in the first evaporation section 31 can be arranged adjacent to the heat exchange tube 72 with an outlet in the second evaporation section 32. The outlets of the two can be connected by a tee pipe joint 73, so that the evaporator 30 has an evaporation outlet 30B. (See reference...) Figure 4 and Figure 5 Understood. Specifically, the three-way pipe connector 73 has three pipe interfaces, two of which are connected to the outlet of the first evaporator 31 and the outlet of the second evaporator 32, respectively, and the third pipe interface forms the evaporation outlet 30B of the evaporator 30, which is used to connect to the inlet of the compressor 10. This facilitates the connection between the evaporator 30 and the compressor 10.

[0042] The evaporator 30 is divided into two parts: a first evaporation section 31 and a second evaporation section 32. The first evaporation section 31 and the second evaporation section 32 are arranged in parallel between the second condenser 22 and the compressor 10. This reduces the pressure drop of the refrigerant when it flows through the evaporator 30, which is beneficial to improving the energy efficiency of the heat pump system, reducing energy loss, and also reducing the amount of refrigerant charged.

[0043] In some implementations, a throttling element 40 is provided on the connecting pipe between the second condenser 22 and the evaporator 30 to reduce the pressure of the high-temperature liquid refrigerant passing through the second condenser 22.

[0044] In a configuration where the evaporator 30 includes a first evaporation section 31 and a second evaporation section 32 arranged in parallel, the throttling element 40 has one inlet and two outlets. The inlet of the throttling element 40 is connected to the outlet of the second condenser 22, and the two outlets of the throttling element 40 are respectively connected to the first evaporation inlet 31A of the first evaporation section 31 and the second evaporation inlet 32A of the second evaporation section 32.

[0045] The first condenser 21 has a first condensing inlet 21A and a first condensing outlet 21B. The first condensing inlet 21A is connected to the outlet of the compressor 10. The first condensing outlet 21B can be connected to the inlet of the second condenser 22 through a first pipe 81. The outlet of the second condenser 22 can be connected to the inlet of the throttling element 40 through a second pipe 82. One outlet of the throttling element 40 is connected to the first evaporation inlet 31A of the first evaporation section 31 through a third pipe 83. The other outlet of the throttling element 40 is connected to the second evaporation inlet 32A of the second evaporation section 32 through a fourth pipe 84. The evaporation outlet 30B of the evaporator 30 is connected to the inlet of the compressor 10.

[0046] For example, the throttling element 40 can be in the form of a capillary tube or a valve.

[0047] In some implementations, the diameter of the heat exchange tube 72 of the evaporator 30 can be selected between 4mm and 8mm. For example, the diameter of the heat exchange tube 72 of the evaporator 30 can be 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, or 8mm, etc. In this way, the size of the evaporator 30 can be further reduced, making the structure of the heat pump system more compact.

[0048] The diameter of the heat exchange tube 72 of the first condenser 21 can be consistent with the diameter range of the heat exchange tube 72 of the evaporator 30. In practical applications, it can be selected according to needs.

[0049] For example, in a tube-fin heat exchanger in which the first condenser 21 and the evaporator 30 are integrated, the heat exchange tube 72 can be a copper tube or an aluminum tube.

[0050] Some implementation schemes, such as Figure 2 and Figure 3 As shown, the second condenser 22 is a microchannel heat exchanger. The microchannel heat exchanger includes multiple flat tubes for refrigerant flow. These tubes can be arranged in one direction and connected sequentially via connecting pipes. Fins can be installed between adjacent tubes. The microchannel heat exchanger has good heat exchange efficiency and a relatively compact structure.

[0051] In practical applications, drying equipment can be a clothes dryer, a washer-dryer combo, or a garment care machine, etc.

[0052] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A heat pump system for drying equipment, characterized in that, The heat pump system includes a compressor, a first condenser, a second condenser, and an evaporator. The outlet of the compressor is connected to the inlet of the first condenser, the outlet of the first condenser is connected to the inlet of the second condenser, the outlet of the second condenser is connected to the inlet of the evaporator, and the outlet of the evaporator is connected to the inlet of the compressor. The first condenser is located on the windward side of the evaporator.

2. The heat pump system according to claim 1, characterized in that, The first condenser and the evaporator are integrated into a single structure.

3. The heat pump system according to claim 2, characterized in that, Both the first condenser and the evaporator are tube-fin heat exchangers.

4. The heat pump system according to any one of claims 1-3, characterized in that, The evaporator includes a first evaporation section and a second evaporation section, which are arranged in parallel between the outlet of the second condenser and the inlet of the compressor.

5. The heat pump system according to claim 4, characterized in that, A throttling element is provided on the connecting pipe between the second condenser and the evaporator. The throttling element has one inlet and two outlets. The inlet of the throttling element is connected to the outlet of the second condenser, and the two outlets of the throttling element are respectively connected to the inlet of the first evaporator and the inlet of the second evaporator.

6. The heat pump system according to claim 4, characterized in that, The evaporator is an integral structure and is a tube-fin heat exchanger. The diameter of the heat exchange tubes in the tube-fin heat exchanger is 4mm to 8mm.

7. The thermal energy system according to claim 4, characterized in that, The evaporator includes a three-way pipe connector with three pipe interfaces, two of which are connected to the outlet of the first evaporation section and the outlet of the second evaporation section, respectively, and the third pipe interface is connected to the inlet of the compressor.

8. The heat pump system according to any one of claims 1-3, characterized in that, The second condenser is a microchannel heat exchanger.

9. A drying equipment, characterized in that, The system includes a drying chamber, an air passage, and a heat pump system, wherein the heat pump system is the heat pump system according to any one of claims 1-8, and the evaporator, the first condenser, the second condenser, and the drying chamber are connected through the air passage to form an air circulation loop. The first condenser is arranged near the outlet of the drying chamber, the second condenser is arranged near the inlet of the drying chamber, and the evaporator is located between the first condenser and the second condenser.

10. The drying equipment according to claim 9, characterized in that, The drying equipment is a clothes dryer.

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