Heat pump system and drying equipment

Abstract

The utility model discloses a heat pump system and drying equipment, the heat pump system comprises a compressor, a drying flow path, a gas-liquid separator, a first loop and a second loop, the compressor is provided with an outlet, a first inlet and a second inlet; the drying flow path is connected with the outlet, and a condenser is arranged on the drying flow path; the gas-liquid separator communicates with the drying flow path, and the gas-liquid separator is provided with a gas outlet and a liquid outlet; one end of the first loop is connected with the liquid outlet, the other end of the first loop is connected with the first inlet, one end of the second loop is connected with the gas outlet, the other end of the second loop is connected with the second inlet, and an evaporator is arranged on the first loop; and a heat exchange part for exchanging heat with the compressor is arranged at the end part of the second loop. Therefore, air can be fed into the compressor through the first inlet and the second inlet at the same time, the air feeding amount and the pressure difference are increased, and the refrigerant can be preheated through the heat exchange part, so that the working performance and efficiency of the compressor can be improved, and the heating capacity is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of drying equipment, in particular to a heat pump system and drying equipment. Background Art

[0002] With the global carbon emission restrictions and the upgrading of energy efficiency standards for household appliances, traditional electric heating dryers tend to be eliminated due to their energy consumption problems. New heat pump dryers are gradually replacing traditional electric heating dryers. Heat pump dryers use refrigerant vapor compression heating cycle to dry clothes. Its heating energy efficiency ratio is generally 3 to 4, and the heating temperature generally does not exceed 80°C. It is more energy-saving, environmentally friendly, efficient and gentle. However, for compressors previously used in heat pump systems such as air conditioners and water heaters, single-suction single-row compressors are usually matched with single-stage cycles. The operating conditions are relatively low in temperature, while the evaporation temperature and condensation temperature of the dryer heat pump working condition are significantly increased, and the pressure difference and load increase several times. This makes it difficult for the performance of compressors previously used in other heat pump systems to meet the working requirements of the dryer heat pump system, resulting in poor working performance and low reliability of the heat pump dryer, which has a negative impact on the drying effect and efficiency of the heat pump dryer. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a heat pump system, in which the compressor can take in air through a first inlet and a second inlet at the same time, increase the air intake volume and pressure difference, and preheat the refrigerant through a heat exchange part, thereby improving the working performance and efficiency of the compressor and increasing the heating capacity.

[0004] The utility model also provides a drying device with the heat pump system.

[0005] According to the heat pump system of the first aspect of the utility model, the heat pump system includes: a compressor, a drying flow path, a gas-liquid separator, a first circuit and a second circuit, the compressor having an outlet, a first inlet and a second inlet; the drying flow path is connected to the outlet, and a condenser is arranged on the drying flow path; the gas-liquid separator is connected to the drying flow path, and the gas-liquid separator has a gas outlet and a liquid outlet; one end of the first circuit is connected to the liquid outlet, the other end of the first circuit is connected to the first inlet, one end of the second circuit is connected to the gas outlet, the other end of the second circuit is connected to the second inlet, and an evaporator is arranged on the first circuit; wherein a heat exchange part for exchanging heat with the compressor is arranged at the end of the second circuit.

[0006] According to the heat pump system of the present invention, the first circuit and the second circuit are connected in parallel between the gas-liquid separator and the compressor, so that the compressor can inhale air through the first inlet and the second inlet at the same time, achieving a larger air intake flow rate, and the compressor has different air intake temperatures and pressures through the first inlet and the second inlet, which can increase the flow rate and reduce the pressure difference, so that the working performance and efficiency of the compressor can be improved, and the heating capacity of the heat pump system can be increased, and the drying function can be enhanced. In addition, the heat exchange part at the end of the second circuit can preheat the compressor 1 and the gas entering the second inlet, which can reduce the compressor workload, help improve energy efficiency, and further optimize the compressor working performance.

[0007] According to some embodiments of the present invention, the heat exchange part includes: an external heat exchange part and an internal heat exchange part, the external heat exchange part is suitable for heat exchange with the shell of the compressor, and the internal heat exchange part is arranged inside the compressor and is suitable for heat exchange with the compressor through thermal convection.

[0008] Furthermore, the external heat exchange part is constructed as a heat exchange tube, which is communicated with the second circuit, passes through the shell, and is suitable for exchanging heat with the shell.

[0009] Furthermore, a heat exchange plate is also provided on the outer periphery of the heat exchange tube, and the heat exchange plate is in contact with the shell and is located on the outer side of the shell or the inner side of the shell.

[0010] In some embodiments, the heat exchange tube has at least one first bent tube segment, the first bent tube segment is disposed around the shell, and the first bent tube segment is disposed opposite to the shell.

[0011] Furthermore, the first bent tube section is arranged in close contact with the outer wall surface of the shell, or is arranged relative to each other with a gap.

[0012] In some embodiments, the inner heat exchange portion is configured as a flexible tube, one end of the flexible tube is in communication with the heat exchange tube, and the other end of the flexible tube is in communication with the first inlet.

[0013] Further, the flexible tube has at least one second bent tube segment, and the second bent tube segment is arranged in the shell around surrounding components.

[0014] Furthermore, the second bent tube section is arranged to fit the outer surface of the surrounding component, or is arranged to be opposite to each other with a gap.

[0015] According to some embodiments of the present invention, a first throttling element is provided on the drying flow path, and the first throttling element is located downstream of the condenser. A second throttling element is provided on the first circuit, and the second throttling element is located upstream of the evaporator.

[0016] Furthermore, the first throttling element is configured as a first capillary tube, the second throttling element is configured as a second capillary tube, and the flow specification ratio of the first capillary tube to the second capillary tube is in the range of [0.2-5].

[0017] According to a drying device of an embodiment of a second aspect of the present invention, the drying device comprises: a heat pump system as described in any one of the above embodiments.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 is a schematic diagram of the working principle of a heat pump system according to some embodiments of the utility model;

[0021] Figure 2 It is a schematic diagram of the compressor structure according to some embodiments of the utility model.

[0022] Reference numerals:

[0023] 100. Heat pump system;

[0024] 1. Compressor;

[0025] 1a, export; 1b, first import; 1c, second import;

[0026] 11. Shell; 12. Surrounding parts; 13. Compression cylinder;

[0027] 2. Drying flow path;

[0028] 3. Condenser;

[0029] 4. Gas-liquid separator; 4a. Gas outlet; 4b. Liquid outlet;

[0030] 5. First circuit;

[0031] 6. Second circuit;

[0032] 7. Evaporator;

[0033] 81. External heat exchange part; 811. Heat exchange plate; 812. First bent pipe section;

[0034] 82. Internal heat exchange part; 821. Second bent pipe section;

[0035] 9. The first throttling element;

[0036] 10. Second throttling element. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0039] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0040] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0042] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0044] In the description of the present invention, a first feature being “above” or “below” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.

[0045] In the description of the present invention, a first feature “above”, “over” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0046] The term "plurality" used in the present application refers to two or more (including two).

[0047] The compressor in the present application can be a device that compresses gas and generates high-pressure gas using any existing working principle, such as a piston compressor, a screw compressor, a centrifugal compressor, etc., to achieve the purpose of compressing gas and obtaining high-pressure gas, and the embodiments of the present application are not limited to this.

[0048] Reference below Figure 1 and Figure 2 A heat pump system 100 and a drying device according to an embodiment of the present invention are described.

[0049] like Figure 1 As shown, according to the heat pump system 100 of the embodiment of the first aspect of the utility model, the heat pump system 100 includes: a compressor 1, a drying flow path 2, a gas-liquid separator 4, a first circuit 5 and a second circuit 6.

[0050] The compressor 1 has an outlet 1a, a first inlet 1b and a second inlet 1c; a drying flow path 2 is connected to the outlet 1a, and a condenser 3 is provided on the drying flow path 2; a gas-liquid separator 4 is connected to the drying flow path 2, and the gas-liquid separator 4 has a gas outlet 4a and a liquid outlet 4b;

[0051] One end of the first loop 5 is connected to the liquid outlet 4b, the other end of the first loop 5 is connected to the first inlet 1b, one end of the second loop 6 is connected to the gas outlet 4a, the other end of the second loop 6 is connected to the second inlet 1c, and an evaporator 7 is provided on the first loop 5; a heat exchange part for exchanging heat with the compressor 1 is provided at the end of the second loop 6.

[0052] Specifically, the compressor 1 is used to drive the circulation of the refrigerant in the heat pump system 100 to achieve heat energy transfer. The compressor 1 has two air intake paths, namely a first inlet 1b and a second inlet 1c. The refrigerant can enter the compressor 1 from the first inlet 1b and the second inlet 1c respectively and be compressed. The outlet 1a of the compressor 1 is connected to the drying flow path 2. The high-temperature and high-pressure gaseous refrigerant compressed by the compressor 1 can flow into the drying flow path 2 from the outlet 1a. When the refrigerant flows to the condenser 3 in the drying flow path 2, a large amount of heat can be released under the action of the condenser 3 to heat the object to be dried, thereby achieving a good drying function. The gas-liquid separator 4 is connected to the drying flow path 2. It can be understood that the gas-liquid separator 4 is located downstream of the drying flow path 2. The refrigerant after passing through the condenser 3 can flow from the drying flow path 2 to the gas-liquid separator 4. The gas-liquid separator 4 can separate the gas and liquid in the refrigerant, and the liquid can be discharged from the liquid outlet 4b of the gas-liquid separator 4 and enter the first circuit 5 connected to the liquid outlet 4b. The gas can be discharged from the gas outlet 4a of the gas-liquid separator 4 and enter the second circuit 6 connected to the gas outlet 4a. The other ends of the first circuit 5 and the second circuit 6 are respectively connected to the first inlet 1b and the second inlet 1c of the compressor 1. Therefore, the refrigerant can return to the compressor 1 through the first circuit 5 and the second circuit 6 to realize the circulation operation of the heat pump system 100.

[0053] It should be pointed out that an evaporator 7 is provided on the first circuit 5. When the liquid refrigerant flowing out of the liquid outlet 4b flows to the evaporator 7 in the first circuit 5, the refrigerant absorbs heat in the evaporator 7 and is converted from liquid to gas. Therefore, when the refrigerant enters the compressor 1 through the first inlet 1b and the second inlet 1c, it is in gaseous state. The compressor 1 realizes double suction operation through the first inlet 1b and the second inlet 1c to effectively increase the suction flow rate.

[0054] In the present invention, a heat exchange part is provided at the end of the second loop 6, which can exchange heat with the compressor 1, so that the refrigerant entering the second inlet 1c can be preheated, and the working efficiency and performance of the compressor 1 can be improved.

[0055] According to the heat pump system 100 of the present invention, the first loop 5 and the second loop 6 are connected in parallel between the gas-liquid separator 4 and the compressor 1, so that the compressor 1 can take in air through the first inlet 1b and the second inlet 1c at the same time, so as to achieve a larger air intake flow rate, and the compressor 1 has different air intake temperatures and pressures through the first inlet 1b and the second inlet 1c, so as to increase the flow rate and reduce the pressure difference, so as to improve the working performance and efficiency of the compressor 1, and to improve the heating capacity of the heat pump system 100 and enhance the drying function. In addition, the heat exchange part at the end of the second loop 6 can preheat the compressor 1 and the gas entering the second inlet 1c, so as to reduce the workload of the compressor 1, help improve energy efficiency, and further optimize the working performance of the compressor 1.

[0056] like Figure 2 As shown, according to some embodiments of the present invention, the heat exchange part includes: an external heat exchange part 81 and an internal heat exchange part 82 .

[0057] The outer heat exchange part 81 is suitable for heat exchange in contact with the shell 11 of the compressor 1 , and the inner heat exchange part 82 is arranged inside the compressor 1 and is suitable for heat exchange with the compressor 1 through heat convection.

[0058] Specifically, the heat exchange part includes an external heat exchange part 81 and an internal heat exchange part 82. The external heat exchange part 81 is located outside the compressor 1 shell 11. The external heat exchange part 81 can be in contact with the compressor 1 shell 11 for heat exchange, and can effectively release heat to the compressor 1 shell 11, thereby enhancing the heat exchange and cooling effect at the second inlet 1c, and preheating the compressor 1 and the gas entering the second inlet 1c. In this way, the working efficiency of the compressor 1 can be improved, and the compression effect of the compressor 1 on the gas can be enhanced, which can improve the drying efficiency and effect; the internal heat exchange part 82 is arranged inside the compressor 1, and the internal heat exchange part 82 can exchange heat with the fluid inside the compressor 1 (such as refrigerant, etc.) through heat convection. In this way, on the one hand, it helps to further enhance the heat exchange and cooling effect at the second inlet 1c, and further optimize the compression performance and efficiency of the compressor 1. On the other hand, the internal heat exchange part 82 can also exchange heat with the fluid such as the lubricant inside the compressor 1, which helps to maintain the temperature stability of the fluid inside the compressor 1, ensure the normal operation of the compressor 1, and improve the working reliability of the compressor 1.

[0059] like Figure 1 and Figure 2 As shown, according to some embodiments of the present invention, the external heat exchange part 81 is constructed as a heat exchange tube, which is connected to the second circuit 6 and passes through the shell 11 and is suitable for exchanging heat with the shell 11.

[0060] Specifically, the external heat exchange part 81 transfers heat by direct contact with the shell 11 of the compressor 1, wherein the external heat exchange part 81 can be constructed as a heat exchange tube. The use of the heat exchange tube form can make the gas in the second loop 6 more efficiently exchange heat with the shell 11 of the compressor 1 through the pipeline, thereby improving the heat exchange efficiency. In addition, at least part of the heat exchange tube passes through the shell 11 of the compressor 1, so that the heat exchange tube can directly contact the inner wall of the shell 11 of the compressor 1 to further improve the efficiency of heat transfer. At the same time, the heat exchange tube passes through the shell 11, which also increases the contact area between the heat exchange tube and the shell 11, which can further improve the speed and efficiency of heat transfer between the compressor 1 and the second loop 6.

[0061] like Figure 1 As shown, according to some embodiments of the present invention, a heat exchange plate 811 is further provided on the outer periphery of the heat exchange tube, and the heat exchange plate 811 is in contact with the shell 11 and is located on the outside of the shell 11 or the inside of the shell 11 .

[0062] Specifically, the heat exchange plate 811 can be arranged on the outer periphery of the heat exchange tube and extend away from the heat exchange tube. The heat of the heat exchange tube and the heat exchange plate 811 can be transferred to each other. The contour of the heat exchange plate 811 is suitable for matching the outer contour or inner contour of the compressor 1 shell 11 so as to fit the outer side of the shell 11 or the inner side of the shell 11. When the heat exchange plate 811 is arranged on the outside of the shell 11, it can directly contact the outer wall surface of the shell 11, increase the contact area between the heat exchange tube and the outer wall surface of the shell 11, and accelerate the heat transfer speed between the heat exchange tube and the shell 11; when the heat exchange plate 811 is arranged on the inside of the shell 11, it can directly contact the inner wall surface of the shell 11, increase the contact area between the heat exchange tube and the inner wall surface of the shell 11, and also accelerate the heat transfer speed between the heat exchange tube and the shell 11. Regardless of whether the heat exchange plate 811 is located on the outside or inside of the shell 11, the heat exchange area between the heat exchange tube and the shell 11 of the compressor 1 can be increased, so as to improve the heat exchange efficiency and heat exchange effect between the gas in the second circuit 6 and the compressor 1 at the second inlet 1c.

[0063] It should be pointed out that the heat exchange plate 811 is arranged in close contact with the shell 11, which can also improve the compactness of the structure, achieve more efficient use of space, and help improve the space utilization rate in the heat pump system 100.

[0064] like Figure 2 As shown, according to some embodiments of the present invention, the heat exchange tube has at least one first bent tube segment 812 , the first bent tube segment 812 is arranged around the shell 11 , and the first bent tube segment 812 is arranged opposite to the shell 11 .

[0065] Specifically, the number of the first bent pipe segments 812 can be one or more, which can be understood as at least one of the pipe segments in the heat exchange tube is bent relative to another pipe segment, and the first bent pipe segment 812 can surround the shell 11 and be arranged radially opposite to the shell 11. By setting the first bent pipe segment 812, on the one hand, the extension direction of the heat exchange tube can be changed, and the adaptability of the connection position of the heat exchange tube with the second circuit 6 and the compressor 1 can be improved; on the other hand, by setting the first bent pipe segment 812, at least part of the heat exchange tube is bent, which can save the space occupied by the heat exchange tube arrangement and improve the space utilization rate; on the third hand, the first bent pipe segment 812 can also realize more heat exchange area between the heat exchange tube and the shell 11, further enhancing the heat exchange efficiency.

[0066] like Figure 2 As shown, according to some embodiments of the present invention, the first bent tube segment 812 is disposed in close contact with the outer wall surface of the shell 11, or is disposed opposite to the outer wall surface of the shell 11 with a gap.

[0067] Specifically, the first bent pipe section 812 in the present invention can be arranged in a fit with the outer wall surface of the shell 11, and the first bent pipe section 812 is in direct contact with the outer wall surface of the shell 11, so that the heat transfer is more direct and efficient, which can reduce the loss in the heat transfer process and improve the heat transfer efficiency; the first bent pipe section 812 in the present invention can also be arranged relative to the shell 11 with a gap, and a certain gap is maintained between the first bent pipe section 812 and the outer wall surface of the shell 11 to form a certain space, which can provide space for thermal expansion, prevent the thermal stress caused by temperature change from damaging the heat exchange tube and the shell 11, protect the heat exchange tube and the shell 11, and extend the service life of the two. At the same time, the air in the gap can be used as a heat exchange medium to further increase the heat exchange area between the heat exchange tube and the shell 11, thereby improving the heat exchange efficiency.

[0068] like Figure 2 As shown, according to some embodiments of the present invention, the inner heat exchange portion 82 is constructed as a flexible tube, one end of the flexible tube is connected to the heat exchange tube, and the other end of the flexible tube is connected to the first inlet 1b.

[0069] Specifically, one end of the flexible tube can be connected to the heat exchange tube, so that the cold energy of the heat exchange tube can be transferred to the flexible tube, and then heat exchange is performed with the fluid inside the compressor 1. The other end of the flexible tube can be connected to the first inlet 1b of the compressor 1. Specifically, the other end of the flexible tube can be connected to the first inlet 1b through the cavity inside the compressor 1 (such as the compression cylinder 13), and the gas sucked into the compressor 1 by the second inlet 1c and the first inlet 1b can be gathered in the cavity inside the compressor 1 for compression, so that the gas is efficiently compressed and discharged from the outlet 1a of the compressor 1.

[0070] It should be pointed out that since the flexible tube has good flexibility and bendability, it can easily adapt to the complex spatial structure and layout inside the compressor 1. Therefore, by constructing the internal heat exchange part 82 as a flexible tube, the internal heat exchange part 82 can more effectively utilize the space inside the compressor 1 and improve the efficiency of heat exchange.

[0071] like Figure 2 As shown, according to some embodiments of the present invention, the flexible tube has at least one second bent tube segment 821 , and the second bent tube segment 821 is disposed in the shell 11 around the surrounding component 12 .

[0072] Specifically, the number of the second bent pipe segments 821 can be one or more, which can be understood as at least one of the pipe segments in the flexible pipe is bent relative to another pipe segment, and the second bent pipe segment 821 can be arranged around the surrounding components 12 in the shell 11 to maximize the contact area between the flexible pipe and the surrounding components 12, thereby enhancing the heat exchange efficiency. Similarly, by setting the second bent pipe segment 821, on the first hand, the extension direction of the flexible pipe can be changed, and the adaptability of the connection position between the flexible pipe and the heat exchange pipe and the internal components of the compressor 1 can be improved; on the second hand, by setting the second bent pipe segment 821, at least part of the flexible pipe is bent, which can make full use of the space inside the shell 11, making the structure of the entire compressor 1 more compact and improving the space utilization; on the third hand, the second bent pipe segment 821 can also achieve more heat exchange area between the flexible pipe and the inside of the shell 11, thereby enhancing the heat exchange efficiency.

[0073] like Figure 2 As shown, according to some embodiments of the present invention, the second bent tube segment 821 is disposed in close contact with the outer surface of the surrounding component 12, or is disposed relative to the outer surface with a gap therebetween.

[0074] Specifically, the second bent pipe segment 821 in the present invention can be arranged in a fit with the outer surface of the surrounding component 12, and the second bent pipe segment 821 is in direct contact with the outer surface of the surrounding component 12, so that the heat transfer is more direct and efficient, which can reduce the loss in the heat transfer process and improve the heat transfer efficiency; the second bent pipe segment 821 in the present invention can also be arranged relative to the surrounding component 12 with a gap, and a certain gap is maintained between the second bent pipe segment 821 and the outer surface of the surrounding component 12 to form a certain space, which can provide space for thermal expansion, prevent the thermal stress caused by temperature changes from damaging the flexible pipe and the surrounding components 12, protect the flexible pipe and the surrounding components 12, and extend the service life. At the same time, the air in the gap can be used as a heat exchange medium to further increase the heat exchange area between the flexible pipe and the surrounding components 12, thereby improving the heat exchange efficiency.

[0075] like Figure 1As shown, according to some embodiments of the utility model, a first throttling element 9 is provided on the drying flow path 2, and the first throttling element 9 is located downstream of the condenser 3, and a second throttling element 10 is provided on the first circuit 5, and the second throttling element 10 is located upstream of the evaporator 7.

[0076] Specifically, the first throttling element 9 and the second throttling element 10 are both suitable for adjusting the flow rate and pressure of the refrigerant in the heat pump system 100, wherein the first throttling element 9 is arranged downstream of the condenser 3 and upstream of the gas-liquid separator 4, so that the first throttling element 9 can adjust the flow rate and pressure of the refrigerant flowing out of the condenser 3 for the first time, and the first throttling element 9 can reduce the flow rate and pressure of the refrigerant before entering the gas-liquid separator 4, so that the refrigerant can better perform heat exchange in subsequent components (such as the evaporator 7 and the compressor 1). The second throttling element 10 is arranged upstream of the evaporator 7 and downstream of the gas-liquid separator 4, so that the second throttling element 10 can adjust the flow rate and pressure of the refrigerant for the second time before the refrigerant enters the evaporator 7, so as to further reduce the flow rate and pressure of the refrigerant, so as to ensure that the refrigerant can fully evaporate in the evaporator 7 and absorb enough heat, thereby further improving the compression effect of the compressor 1 on the refrigerant and improving the drying efficiency of the heat pump system 100.

[0077] It should be pointed out that the second throttling element 10 is located downstream of the first throttling element 9 in the heat pump system 100, and the two are connected in series in the circulation path of the refrigerant in the heat pump system 100. The refrigerant passes through the first throttling element 9 and the second throttling element 10, and can be throttled twice. Compared with the related art in which the refrigerant is throttled only once between the condenser 3 and the evaporator 7, the refrigerant in the present invention is throttled twice, which can achieve a larger temperature difference, greatly improve the energy efficiency and reliability of the heat pump system 100, and optimize the drying function and performance of the heat pump system 100.

[0078] In addition, the first throttling element 9 and the second throttling element 10 can select different types of throttling elements according to the specific requirements of the heat pump system 100 and the type of refrigerant, and can be specifically but not limited to being constructed as a capillary tube, a thermal expansion valve or an electronic expansion valve.

[0079] like Figure 1 As shown, according to some embodiments of the present invention, the first throttling element 9 is configured as a first capillary tube, the second throttling element 10 is configured as a second capillary tube, and the flow specification ratio of the first capillary tube and the second capillary tube is in the range of [0.2-5].

[0080] Specifically, since the capillary has the advantages of simple structure, high reliability, good adaptability, good pressure reduction effect, small size, light weight and low cost, the first throttling element 9 is constructed as a first capillary and the second throttling element 10 is constructed as a second capillary, which is beneficial to ensure that the first throttling element 9 and the second throttling element 10 have good flow and pressure regulation functions, and is beneficial to optimizing the installation arrangement of the first throttling element 9 and the second throttling element 10, and saving production costs. Further, the flow rate specification ratio of the first capillary tube and the second capillary tube is set in the range of [0.2-5], wherein the flow rate specification ratio refers to the ratio of the flow rates of the first capillary tube and the second capillary tube under the same pressure difference. When the ratio is small (close to 0.2, such as 0.3, 0.4 or 0.5), it means that the flow rate of the first capillary tube is relatively small, which is conducive to forming a relatively high pressure drop on the drying flow path 2, thereby improving the drying efficiency; when the ratio is large (close to 5, such as 4, 4.5 or 4.8), it means that the flow rate of the second capillary tube is relatively small, which is conducive to more complete evaporation of the refrigerant in the evaporator 7, thereby improving the subsequent heating efficiency. By setting the flow rate specification ratio of the first capillary tube and the second capillary tube in the range of [0.2-5], the flow rate specification ratio of the first capillary tube and the second capillary tube has a suitable range, which can optimize the performance of the heat pump system 100, improve the operating stability of the heat pump system 100, and enhance the flexibility and adaptability of the heat pump system 100.

[0081] Preferably, the flow specification ratio of the first capillary tube and the second capillary tube is set to 1, so as to ensure that the first capillary tube and the second capillary tube have a good regulating effect on the refrigerant flow and pressure in the heat pump system 100 .

[0082] According to the heat pump system 100 of the utility model, the circulation path of the refrigerant flowing through the first circuit 5 is: first inlet 1b→compressor 1→outlet 1a→condenser 3→first throttling element 9→gas-liquid separator 4→liquid outlet 4b→second throttling element 10→evaporator 7→first inlet 1b; the circulation path of the refrigerant flowing through the second circuit 6 is: second inlet 1c→compressor 1→outlet 1a→condenser 3→first throttling element 9→gas-liquid separator 4→gas outlet 4a→second inlet 1c.

[0083] Among them, the first circuit 5 and the second circuit 6 are connected in parallel, the first inlet 1b and the second inlet 1c of the compressor 1 can take in air at the same time, and the intake pressures of the two are different, which can increase the intake flow of the compressor 1, and the first throttling element 9 and the second throttling element 10 are connected in series, which can increase the refrigerant temperature difference, and the end of the second circuit 6 is provided with an external heat exchange part 81 and an internal heat exchange part 82 for heat exchange with the compressor 1, which can realize pre-cooling of the refrigerant, thereby improving the heating capacity, working efficiency, reliability and energy efficiency of the heat pump system 100.

[0084] like Figure 1 and Figure 2 As shown, according to the drying device of the second aspect of the utility model, the drying device can be a dryer, a washer-dryer, etc. The drying device includes the heat pump system 100 described in any one of the above embodiments, and the technical effects produced are consistent with those in the above embodiments, which will not be repeated here.

[0085] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0086] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A heat pump system, characterized in that: include: a compressor having an outlet, a first inlet, and a second inlet; A drying flow path, the drying flow path is connected to the outlet, and a condenser is provided on the drying flow path; A gas-liquid separator, the gas-liquid separator is in communication with the drying flow path, and the gas-liquid separator has a gas outlet and a liquid outlet; a first circuit and a second circuit, wherein one end of the first circuit is connected to the liquid outlet, the other end of the first circuit is connected to the first inlet, one end of the second circuit is connected to the gas outlet, the other end of the second circuit is connected to the second inlet, and an evaporator is provided on the first circuit; in A heat exchanging portion for exchanging heat with the compressor is disposed at an end of the second circuit.

2. The heat pump system according to claim 1, characterized in that: The heat exchange part includes: an external heat exchange part and an internal heat exchange part, the external heat exchange part is suitable for heat exchange with the shell of the compressor, and the internal heat exchange part is arranged inside the compressor and is suitable for heat exchange with the compressor through thermal convection.

3. The heat pump system according to claim 2, characterized in that: The external heat exchange part is constructed as a heat exchange tube, which is communicated with the second circuit, passes through the shell, and is suitable for exchanging heat with the shell.

4. The heat pump system according to claim 3, characterized in that: A heat exchange plate is also arranged on the outer periphery of the heat exchange tube. The heat exchange plate is fitted with the shell and is located on the outer side or the inner side of the shell.

5. The heat pump system according to claim 3, characterized in that: The heat exchange tube has at least one first bent tube section, the first bent tube section is arranged around the shell, and the first bent tube section is arranged opposite to the shell.

6. The heat pump system according to claim 5, characterized in that: The first bent tube section is arranged in close contact with the outer wall surface of the shell, or is arranged opposite to the outer wall surface of the shell with a gap.

7. The heat pump system according to claim 3, characterized in that: The inner heat exchange portion is configured as a flexible tube, one end of which is in communication with the heat exchange tube, and the other end of which is in communication with the first inlet.

8. The heat pump system according to claim 7, characterized in that: The flexible tube has at least one second bent tube segment, and the second bent tube segment is arranged in the shell around surrounding components.

9. The heat pump system according to claim 8, characterized in that: The second bent tube section is arranged in close contact with the outer surface of the surrounding component, or is arranged relative to the outer surface of the surrounding component with a gap.

10. The heat pump system according to claim 1, characterized in that: A first throttling element is arranged on the drying flow path, and the first throttling element is located downstream of the condenser. A second throttling element is arranged on the first circuit, and the second throttling element is located upstream of the evaporator.

11. The heat pump system according to claim 10, characterized in that: The first throttling element is configured as a first capillary tube, the second throttling element is configured as a second capillary tube, and the flow rate specification ratio between the first capillary tube and the second capillary tube is within the range of [0.2-5].

12. A drying device, characterized in that: include: The heat pump system according to any one of claims 1 to 11.

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