A high-efficiency heat pump drying system

Abstract

The embodiment of the present invention provides a high-efficiency heat pump drying system, which relates to the field of heat pump drying. The high-efficiency heat pump drying system includes a return air duct, a first air supply duct, a second air supply duct, a compressor, a first heat exchanger, a second heat exchanger and a throttling structure. The first heat exchanger includes a first heat exchange part located in the first air supply duct and a second heat exchange part located in the second air supply duct. The first heat exchange part is connected to the second heat exchange part. The inlet of the first heat exchanger is arranged in the first heat exchange part, and the outlet of the first heat exchanger is arranged in the second heat exchange part. The second heat exchanger is installed in the first air supply duct, and the air passes through the second heat exchanger and the first heat exchange part in sequence. The compressor is connected to the first heat exchanger, the first heat exchanger is connected to the throttling structure, the throttling structure is connected to the second heat exchanger, and the second heat exchanger is connected to the compressor. The embodiment of the present invention can improve the efficiency of the heat pump drying system.

Description

Technical Field

[0001] The invention relates to the field of heat pump drying, and in particular to a high-efficiency heat pump drying system. Background Art

[0002] In conventional dehumidification heat pump drying systems, the air volume is often reduced in order to increase the dehumidification capacity of the treated space after passing through the evaporator. When the air passes through the condenser, it will cause a large temperature difference and a small flow rate of the treated air, making the condensation temperature very high, thereby reducing the efficiency of the refrigeration cycle. Summary of the invention

[0003] The object of the present invention is to provide a high-efficiency heat pump drying system, which can improve the efficiency of the heat pump drying system.

[0004] The embodiment of the present invention is achieved as follows:

[0005] The embodiment of the present invention provides a high-efficiency heat pump drying system, comprising a return air duct, a first air supply duct, a second air supply duct, a compressor, a first heat exchanger, a second heat exchanger, a first fan, a second fan and a throttling structure; the return air duct is respectively connected to the first air supply duct and the second air supply duct, so that the air in the return air duct flows to the first air supply duct and the second air supply duct; the first heat exchanger comprises a first heat exchange part located in the first air supply duct and a second heat exchange part located in the second air supply duct, the first heat exchange part is connected to the second heat exchange part, and the inlet of the first heat exchanger The first heat exchange part is arranged, and the outlet of the first heat exchanger is arranged in the second heat exchange part; the second heat exchanger is installed in the first air supply duct, and the air passes through the second heat exchanger and the first heat exchange part in sequence; the first fan is installed in the first air supply duct, and the second fan is installed in the second air supply duct; the exhaust port of the compressor is connected to the inlet of the first heat exchanger, the outlet of the first heat exchanger is connected to one end of the throttling structure, the other end of the throttling structure is connected to the inlet of the second heat exchanger, and the outlet of the second heat exchanger is connected to the suction port of the compressor.

[0006] In an optional embodiment, the high-efficiency heat pump drying system also includes a first water receiving pan and a first drain pipe, the first water receiving pan is installed below the second heat exchanger, and the first drain pipe is connected to the first water receiving pan for draining the water in the first water receiving pan out of the air duct.

[0007] In an optional embodiment, a vent is provided between the first air supply duct and the second air supply duct, and the vent is communicated with the first air supply duct and the second air supply duct.

[0008] In an optional embodiment, the high-efficiency heat pump drying system further includes an air valve regulating member, wherein the air valve regulating member is installed at the vent and is used to adjust the air volume of the vent.

[0009] In an optional embodiment, the first fan is located between the vent and the second heat exchanger, and the second fan is located between the vent and the second heat exchange part, or downstream of the second heat exchange part; or, the second fan is located on the side of the vent away from the second heat exchange part, and the first fan is located between the vent and the first heat exchange part, or downstream of the first heat exchange part.

[0010] In an optional embodiment, the second heat exchanger includes a third heat exchange part and a fourth heat exchange part that are interconnected; the third heat exchange part is located in the first air supply duct, the fourth heat exchange part is located in the second air supply duct, the inlet of the second heat exchanger is arranged at the fourth heat exchange part, and the outlet of the second heat exchanger is arranged at the third heat exchange part; the first fan is located between the first heat exchange part and the third heat exchange part, and the second fan is located between the second heat exchange part and the fourth heat exchange part.

[0011] In an optional embodiment, the first heat exchanger includes multiple heat exchange tube flows, each of the heat exchange tube flows is connected to the refrigerant inlet and the refrigerant outlet of the first heat exchanger, the heat exchange tube flows include multiple heat exchange tubes, and the multiple heat exchange tubes are continuously connected, and the multiple heat exchange tube flows include at least one heat exchange tube flow from the first air supply duct to the second air supply duct.

[0012] In an optional embodiment, the first heat exchanger includes two heat exchangers and a connecting pipe connected to the two heat exchangers, one of the two heat exchangers is located in the first air supply duct and is the first heat exchange part, and the other heat exchanger is located in the second air supply duct and is the second heat exchange part.

[0013] In an optional embodiment, a duct boundary plate is provided on the first heat exchanger, the first heat exchange part and the second heat exchange part are respectively located on both sides of the duct boundary plate, a partition plate is provided between the first air supply duct and the second air supply duct, and the duct boundary plate is connected to the partition plate.

[0014] In an optional embodiment, the high-efficiency heat pump drying system also includes a moving mechanism, a partition plate is provided between the first air supply duct and the second air supply duct, and the moving mechanism is transmission-connected to the first heat exchanger or the partition plate, and is used to enable the first heat exchanger and the partition plate to move relative to each other, so as to adjust the different proportions of heat exchange areas of the first heat exchange part and the second heat exchange part in the first air supply duct and the second air supply duct, respectively.

[0015] In an optional embodiment, the high-efficiency heat pump drying system also includes a third heat exchanger and a third fan, the third heat exchanger is located outside the return air duct, the first air supply duct and the second air supply duct, the inlet of the third heat exchanger is connected to the outlet of the first heat exchanger, the outlet of the third heat exchanger is connected to the throttling structure, and the third fan is adjacent to the third heat exchanger for exchanging heat with the third heat exchanger.

[0016] In an optional embodiment, the high-efficiency heat pump drying system also includes a first water receiving pan and a first drain pipe, the first water receiving pan is installed below the second heat exchanger, and the first drain pipe is connected to the first water receiving pan for draining the water in the first water receiving pan to the third heat exchanger.

[0017] In an optional embodiment, the high-efficiency heat pump drying system also includes a fourth heat exchanger, which is located outside the return air duct, the first air supply duct and the second air supply duct, and the fourth heat exchanger includes a first pipe and a second pipe that are isolated from each other, and the two ends of the first pipe are respectively connected to the outlet of the first heat exchanger and the throttling structure, and the first pipe and the second pipe are used to exchange heat between the refrigerant and the external cold source.

[0018] In an optional embodiment, the high-efficiency heat pump drying system also includes a fifth heat exchanger, which is located outside the return air duct, the first air supply duct and the second air supply duct, the inlet of the fifth heat exchanger is connected to the outlet of the first heat exchanger, and the outlet of the fifth heat exchanger is connected to the throttling structure; the high-efficiency heat pump drying system also includes a water pump, a second water receiving pan, a second drain pipe and a fifth fan, the second water receiving pan is installed below the fifth heat exchanger, the second drain pipe is connected to the second water receiving pan, the water pump is connected to the second water receiving pan, and is used to spray the water in the second water receiving pan to the surface of the fifth heat exchanger, and the fifth fan is used to make air flow through the surface of the fifth heat exchanger.

[0019] In an optional embodiment, the high-efficiency heat pump drying system also includes a first water receiving pan and a first drain pipe. The first water receiving pan is installed below the second heat exchanger. The first drain pipe is connected to the first water receiving pan and is used to drain the water in the first water receiving pan to the second water receiving pan or the pipeline in front of the water pump.

[0020] In an optional embodiment, the high-efficiency heat pump drying system also includes a first water receiving pan, a first drain pipe and a sixth heat exchanger, the sixth heat exchanger is located in the first air supply duct and is arranged close to the second heat exchanger, so that the air passes through the sixth heat exchanger and the second heat exchanger in sequence, the first water receiving pan is installed below the second heat exchanger and the sixth heat exchanger, the first drain pipe is connected to the first water receiving pan, and is used to drain the water in the first water receiving pan to the outside of the air duct.

[0021] In an optional embodiment, the high-efficiency heat pump drying system also includes a third heat exchanger and a third fan, the third heat exchanger is located outside the return air duct, the first air supply duct and the second air supply duct, the inlet of the third heat exchanger is connected to the outlet of the first heat exchanger, the outlet of the third heat exchanger is connected to the throttling structure, and the third fan is adjacent to the third heat exchanger for exchanging heat with the third heat exchanger.

[0022] In an optional embodiment, the high-efficiency heat pump drying system also includes a fifth heat exchanger, which is located outside the return air duct, the first air supply duct and the second air supply duct, the inlet of the fifth heat exchanger is connected to the outlet of the first heat exchanger, and the outlet of the fifth heat exchanger is connected to the throttling structure; the high-efficiency heat pump drying system also includes a water pump, a second water receiving pan, a second drain pipe and a fifth fan, the second water receiving pan is installed below the fifth heat exchanger, the second drain pipe is connected to the second water receiving pan, the water pump is connected to the second drain pipe, and is used to drain the water in the second water receiving pan to the sixth heat exchanger, and the fifth fan is used to make air flow through the surface of the fifth heat exchanger and vaporize at least part of the water on the surface.

[0023] In an optional embodiment, the high-efficiency heat pump drying system further includes a connecting valve, which is disposed in the second drainage pipeline and is used to divert water in the second drainage pipeline to the sixth heat exchanger or the fifth heat exchanger.

[0024] In an optional embodiment, at least one of the return air duct, the first air supply air duct and the second air supply air duct is provided with an air valve, and the air valve is used to adjust the air volume.

[0025] In an optional embodiment, the high-efficiency heat pump drying system also includes a drying area, the return air duct is connected to the drying area through the air duct, the first supply air duct is connected to the material feed inlet of the drying area through the air duct, the return air duct is connected to the material discharge port of the drying area through the air duct, and the second supply air duct is connected to the inlet and outlet of the drying area.

[0026] In an optional embodiment, the high-efficiency heat pump drying system also includes an adjusting air valve, the second air supply duct is connected to the drying area through the air duct, the adjusting air valve is installed in the air duct, and is used to control the air outlet position of the air duct in the drying area.

[0027] In an optional embodiment, the air duct between the second air supply duct and the drying area includes multiple sub-ducts, and the regulating air valve cooperates with the multiple sub-ducts to connect one or more of the multiple sub-ducts, thereby controlling the air outlet position of the air duct in the drying area.

[0028] In an optional embodiment, the air duct between the second air supply duct and the drying area includes a plurality of sub-ducts, and the high-efficiency heat pump drying system also includes regulating air valves correspondingly arranged in the plurality of sub-ducts, and the regulating air valves cooperate with the plurality of sub-ducts to connect one or more of the plurality of sub-ducts, thereby controlling the air outlet position of the air duct in the drying area.

[0029] In an optional embodiment, the high-efficiency heat pump drying system also includes an adjusting mechanism, the second air supply duct is connected to the drying area through the air duct, the air duct between the second air supply duct and the drying area is movably connected to the drying area, and the adjusting mechanism is transmission-connected to the air duct between the second air supply duct and the drying area, and is used to adjust the connection position of the air duct between the second air supply duct and the drying area and the drying area.

[0030] The beneficial effects of the embodiment of the present invention are: the high-efficiency heat pump drying system includes a return air duct, a first air supply duct, a second air supply duct, a compressor, a first heat exchanger, a second heat exchanger, a first fan, a second fan and a throttling structure. Among them, the first heat exchanger includes a first heat exchange part located in the first air supply duct and a second heat exchange part located in the second air supply duct, the first heat exchange part is connected to the second heat exchange part, the inlet of the first heat exchanger is arranged in the first heat exchange part, and the outlet of the first heat exchanger is arranged in the second heat exchange part; the second heat exchanger is installed in the first air supply duct, and the air passes through the second heat exchanger and the first heat exchange part in sequence; the first fan is installed in the first air supply duct, and the second fan is installed in the second air supply duct. Through the dehumidified air, heat is exchanged with the inlet exhaust temperature section of the first heat exchanger, and the sensible heat is fully utilized through heat exchange with the exhaust gas, so that a higher air supply temperature can be achieved at a lower condensation temperature, thereby improving the efficiency of heat pump drying. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A schematic diagram of the structure of a high-efficiency heat pump drying system provided by an embodiment of the present invention;

[0033] Figure 2 A schematic structural diagram of a high-efficiency heat pump drying system with vents provided in an embodiment of the present invention;

[0034] Figure 3 A schematic structural diagram of another form of a high-efficiency heat pump drying system with a vent provided by an embodiment of the present invention;

[0035] Figure 4 A schematic structural diagram of a high-efficiency heat pump drying system with another form of second heat exchanger provided in an embodiment of the present invention;

[0036] Figure 5 for Figure 1 A schematic structural diagram of the first heat exchanger in FIG.

[0037] Figure 6 for Figure 1 A schematic structural diagram of another first heat exchanger in;

[0038] Figure 7 A schematic structural diagram of a high-efficiency heat pump drying system with a third heat exchanger provided in an embodiment of the present invention;

[0039] Figure 8 for Figure 7 A structural schematic diagram of another form of high-efficiency heat pump drying system;

[0040] Fig. 9 A schematic structural diagram of a high-efficiency heat pump drying system with a fourth heat exchanger provided in an embodiment of the present invention;

[0041] Fig.10 A structural schematic diagram of a high-efficiency heat pump drying system with a fifth heat exchanger is provided for an embodiment of the present invention;

[0042] Fig.11 A structural schematic diagram of a high-efficiency heat pump drying system with a sixth heat exchanger is provided for an embodiment of the present invention;

[0043] Fig.12A structural schematic diagram of a high-efficiency heat pump drying system having a third heat exchanger and a sixth heat exchanger is provided for an embodiment of the present invention;

[0044] Fig.13 A schematic structural diagram of a high-efficiency heat pump drying system having a fifth heat exchanger and a sixth heat exchanger is provided for an embodiment of the present invention;

[0045] Fig.14 A structural schematic diagram of another high-efficiency heat pump drying system having a fifth heat exchanger and a sixth heat exchanger is provided for an embodiment of the present invention;

[0046] Fig.15 A structural schematic diagram of the connection between a high-efficiency heat pump drying system and a drying area is provided for an embodiment of the present invention.

[0047] Icons: 100-high-efficiency heat pump drying system; 101-return air duct; 102-first air supply duct; 103-second air supply duct; 104-compressor; 105-first heat exchanger; 1051-first heat exchange part; 1052-second heat exchange part; 1053-air duct boundary plate; 1054-connecting pipeline; 106-second heat exchanger; 107-first fan; 108-second fan; 109-throttling structure; 110-first water tray ;111-first drain pipe;112-vent;113-wind valve adjustment member;114-third heat exchanger;115-third fan;116-fourth heat exchanger;117-fifth heat exchanger;118-water pump;119-second water tray;120-second drain pipe;121-fifth fan;122-sixth heat exchanger;123-connecting valve;124-water spreading device;126-drying area;127-adjusting wind valve;128-sub-air duct. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0049] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0051] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0052] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0053] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected 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 the present invention can be understood according to specific circumstances.

[0054] See also Figure 1 The embodiment of the present invention provides a high-efficiency heat pump drying system 100. The high-efficiency heat pump drying system 100 can be used to dry items, such as cooperating with a drying room to achieve drying of items. The items can be various agricultural products, medicinal materials, or sludge.

[0055] In the embodiment of the present invention, the high-efficiency heat pump drying system 100 includes a return air duct 101, a first air supply duct 102, a second air supply duct 103, a compressor 104, a first heat exchanger 105, a second heat exchanger 106, a first fan 107, a second fan 108 and a throttling structure 109, the return air duct 101 is connected to the first air supply duct 102 and the second air supply duct 103 respectively, and the return air duct 101, the first air supply duct 102 and the second air supply duct 103 are respectively used to connect to the drying area 126 (see Fig.15) connection; the first heat exchanger 105 includes a first heat exchange part 1051 located in the first air supply duct 102 and a second heat exchange part 1052 located in the second air supply duct 103, the first heat exchange part 1051 is connected to the second heat exchange part 1052, the inlet of the first heat exchanger 105 is arranged at the first heat exchange part 1051, and the outlet of the first heat exchanger 105 is arranged at the second heat exchange part 1052; the second heat exchanger 106 is installed in the first air supply duct 102, and the air is sequentially Through the second heat exchanger 106 and the first heat exchange part 1051; the first fan 107 is installed in the first air supply duct 102, and the second fan 108 is installed in the second air supply duct 103; the exhaust port of the compressor 104 is connected to the inlet of the first heat exchanger 105, the outlet of the first heat exchanger 105 is connected to one end of the throttling structure 109, the other end of the throttling structure 109 is connected to the inlet of the second heat exchanger 106, and the outlet of the second heat exchanger 106 is connected to the suction port of the compressor 104.

[0056] It should be understood that in the compression refrigeration cycle of the heat pump drying system, the lower the condensation temperature, the more energy-saving the system is, that is, optimizing the condenser can improve the system energy efficiency, but how to optimize the condenser to improve the system energy efficiency has always been a key difficulty for technicians in this field to study and overcome. In an embodiment of the present invention, the first heat exchanger 105 is a condenser as a refrigeration cycle, and the first heat exchanger 105 includes a first heat exchange part 1051 and a second heat exchange part 1052. A part of the return air of the system passes through the first air supply duct 102 and can be heat exchanged through the second heat exchanger 106. The second heat exchanger 106 can condense part of the moisture in the air. Further, after heat exchange through the second heat exchanger 106, the part of the air is heat exchanged through the first heat exchange part 1051 of the first heat exchanger 105 to utilize the high exhaust temperature to achieve a higher air supply temperature. The air passing through the first heat exchange part 1051 of the first heat exchanger 105 can make full use of the heat of the sensible heat part of the refrigerant, especially the high exhaust temperature of the sensible heat part.

[0057] Preferably, countercurrent heat exchange can be used to make the supply air temperature close to the exhaust temperature, so that the supply air temperature is higher. In practical applications, by setting a lower air volume and higher exhaust air of the first heat exchange part 1051, a high air outlet state can be adjusted, and at the same time, air with a lower relative humidity can be formed.

[0058] At the same time, another part of the return air flows to the second air supply duct 103 and passes through the second heat exchange part 1052 of the first heat exchanger 105, so as to make better use of the condensation heat of the condenser and achieve the purpose of lowering the condensation temperature. For the heat pump drying process, the lower the condensation temperature, the more energy-saving it is. The embodiment of the present invention can obtain high-temperature and low relative humidity air supply under relatively low condensation temperature, thereby making heat pump drying more efficient and energy-saving.

[0059] It should be pointed out that the above-mentioned first fan 107 and second fan 108 can be respectively arranged in the first air supply duct 102 and the second air supply duct 103; however, it is not limited to this. In other embodiments of the present invention, other air supply devices can also be used to guide the air in the return air duct 101 to the first air supply duct 102 and the second air supply duct 103 respectively.

[0060] The high-efficiency heat pump drying system 100 provided in the embodiment of the present invention: by exchanging heat with the inlet exhaust temperature section of the first heat exchanger 105 through the dehumidified air, and by exchanging heat with the exhaust gas, the sensible heat is fully utilized, and a higher supply air temperature can be achieved at a lower condensing temperature, thereby improving the efficiency of heat pump drying.

[0061] Furthermore, the high-efficiency heat pump drying system 100 can also include a first water receiving tray 110 and a first drain pipe 111. The first water receiving tray 110 is installed below the second heat exchanger 106. The first drain pipe 111 is connected to the first water receiving tray 110 for discharging water in the first water receiving tray 110 to the outside of the air duct.

[0062] It should be understood that the first water receiving pan 110 is used to receive condensed water generated by the second heat exchanger 106 and then discharge the condensed water out of the air duct through the first drain pipe 111. Of course, a pump can also be provided in the first water receiving pan 110 to pump water 118 out of the first water receiving pan 110.

[0063] See also Figure 2 In an optional embodiment, a vent 112 is provided between the first air supply duct 102 and the second air supply duct 103 , and the vent 112 is connected to the first air supply duct 102 and the second air supply duct 103 .

[0064] exist Figure 2 In the illustrated embodiment, a portion of the air flowing through the second heat exchanger 106 can be introduced into the second air supply duct 103 through the vent 112, thereby reducing the air volume flowing through the first heat exchange portion 1051, further increasing the supply air temperature of the first air supply duct 102, and reducing the supply air relative humidity of the first air supply duct 102; at the same time, the air in the second air supply duct 103 can also be introduced into the first air supply duct 102 through the vent 112, mixed with the air passing through the second heat exchanger 106, and then flow through the first heat exchange portion 1051, so as to achieve the purpose of adjusting the supply air temperature and the relative humidity of the supply air in the first air supply duct 102.

[0065] It should be understood that an air valve regulating member 113 may be provided on the vent 112. That is, the high-efficiency heat pump drying system 100 further includes an air valve regulating member 113, which is installed on the vent 112 and is used to adjust the air volume of the vent 112. In other words, the air volume of the vent 112 can be adjusted by adjusting the opening of the air valve regulating member 113, so as to meet different usage requirements. At the same time, the air valve regulating member 113 can also adjust the ventilation direction, that is, the air can be directed from the first air supply duct 102 to the second air supply duct 103, or from the second air supply duct 103 to the first air supply duct 102.

[0066] In an optional embodiment, if Figure 2 As shown, the first fan 107 is located between the vent 112 and the second heat exchanger 106, and the second fan 108 is located between the vent 112 and the second heat exchange portion 1052, or located downstream of the second heat exchange portion 1052; or Figure 3 As shown, the second fan 108 is located on a side of the vent 112 away from the second heat exchange portion 1052 , and the first fan 107 is located between the vent 112 and the first heat exchange portion 1051 , or downstream of the first heat exchange portion 1051 .

[0067] It should be pointed out that when "the first fan 107 is located between the vent 112 and the second heat exchanger 106, and the second fan 108 is located between the vent 112 and the second heat exchange part 1052", air can enter the vent 112 from the outlet of the first fan 107; when "the first fan 107 is located between the vent 112 and the first heat exchange part 1051, and the second fan 108 is located on the side of the vent 112 away from the second heat exchange part 1052", air can enter the vent 112 from the outlet of the second fan 108. At this time, relative to the above-mentioned scheme of entering the vent 112 from the outlet of the first fan 107, the flow direction of the gas is generally opposite. At the same time, this scheme can also be combined with the scheme of setting the air valve adjustment member 113 to control whether the first air supply duct 102 and the second air supply duct 103 are connected by adjusting the air valve 127.

[0068] See also Figure 4 In an optional embodiment, the second heat exchanger 106 includes a third heat exchange part and a fourth heat exchange part connected to each other; the third heat exchange part is located in the first air supply duct 102, the fourth heat exchange part is located in the second air supply duct 103, the inlet of the second heat exchanger 106 is arranged at the fourth heat exchange part, and the outlet of the second heat exchanger 106 is arranged at the third heat exchange part; the first fan 107 is located between the first heat exchange part 1051 and the third heat exchange part, and the second fan 108 is located between the second heat exchange part 1052 and the fourth heat exchange part.

[0069] It should be noted that in order to increase the amount of water removed and the water removal efficiency through the second heat exchanger 106, it is necessary to adjust the air volume flowing through the second heat exchanger 106. Figure 4 In the scheme shown, the air volume passing through the third heat exchange part and the fourth heat exchange part can be adjusted to achieve different supply air temperatures and supply air relative humidity requirements at the outlet of the first supply air duct 102 and the outlet of the second supply air duct 103. The evaporator temperature of the second heat exchanger 106 can also be increased to achieve a more efficient operation effect.

[0070] Optionally, the second heat exchanger 106 and the first heat exchanger 105 may have the same or similar structure.

[0071] See also Figure 5 In an optional embodiment, the first heat exchanger 105 includes a plurality of heat exchange tube flows, each heat exchange tube flow is connected to the refrigerant inlet and the refrigerant outlet of the first heat exchanger 105, the heat exchange tube flow includes a plurality of heat exchange tubes, and the plurality of heat exchange tubes are continuously connected, and the plurality of heat exchange tube flows include at least one heat exchange tube flow from the first air supply duct 102 to the second air supply duct 103, so that the refrigerant is evenly distributed in the plurality of flows, avoiding the problem of uneven distribution of two-phase (gaseous and liquid) refrigerant.

[0072] Furthermore, the multiple heat exchange tube processes of the second heat exchanger 106 all extend from the first air supply duct 102 to the second air supply duct 103, thereby achieving a better distribution effect.

[0073] See also Figure 6 In an optional embodiment, the first heat exchanger 105 includes two heat exchangers and a connecting pipe 1054 connected to the two heat exchangers. One of the two heat exchangers is located in the first air supply duct 102 and is the first heat exchange part 1051. The other heat exchanger is located in the second air supply duct 103 and is the second heat exchange part 1052.

[0074] That is to say, the first heat exchanger 105 can be formed by combining two heat exchangers (such as Figure 6 As shown), the two heat exchangers are the first heat exchange part 1051 and the second heat exchange part 1052 mentioned above; of course, the first heat exchanger 105 can also be as Figure 5 As shown, at least one of the multiple heat exchange tube flows of the first heat exchanger 105 is from the first air supply duct 102 to the second air supply duct 103. Preferably, the multiple heat exchange tube flows are from the first air supply duct 102 to the second air supply duct 103 to improve the heat exchange efficiency of the first heat exchanger 105 and further improve the effect of heat pump drying.

[0075] It should be noted that when the second heat exchanger 106 includes the third heat exchange part and the fourth heat exchange part, it can also adopt a structural setting similar to the first heat exchange part 1051 and the second heat exchange part 1052 of the first heat exchanger 105, that is, it can adopt a structural form of two heat exchangers, or adopt a structural form in which at least one heat exchange tube flow in multiple heat exchange tube flows extends from the first air supply duct 102 to the second air supply duct 103. Optionally, for a solution with multiple heat exchange tube flows, all heat exchange tube flows extend from the first air supply duct 102 to the second air supply duct 103.

[0076] Optionally, the first heat exchanger 105 is provided with an air duct boundary plate 1053 (see Figure 5 ), the first heat exchange part 1051 and the second heat exchange part 1052 are respectively located on both sides of the air duct dividing plate 1053, a partition plate is provided between the first air supply duct 102 and the second air supply duct 103, and the air duct dividing plate 1053 is connected to the partition plate.

[0077] Likewise, the third heat exchange part and the fourth heat exchange part of the second heat exchanger 106 may also be provided with boundary plates for connecting with the partition plates of the air duct.

[0078] In an optional embodiment, the above-mentioned high-efficiency heat pump drying system 100 may further include a moving mechanism, with a partition plate between the first air supply duct 102 and the second air supply duct 103, and the moving mechanism is transmission-connected to the first heat exchanger 105 or the partition plate, and is used to make the first heat exchanger 105 and the partition plate move relative to each other, so as to adjust the different proportions of the heat exchange areas of the first heat exchange part 1051 and the second heat exchange part 1052 in the first air supply duct 102 and the second air supply duct 103 respectively.

[0079] Optionally, the moving mechanism may be controlled by a controller, and the moving mechanism may be in the form of a hydraulic pump, a motor, etc. The embodiment of the present invention does not limit the specific structure of the moving mechanism.

[0080] Similarly, for the third heat exchange part and the fourth heat exchange part of the second heat exchanger 106, the ratio thereof in the first air supply duct 102 and the second air supply duct 103 can also be adjusted by the moving mechanism.

[0081] See also Figure 7 In an optional embodiment, the high-efficiency heat pump drying system 100 also includes a third heat exchanger 114 and a third fan 115. The third heat exchanger 114 is located outside the return air duct 101, the first air supply duct 102 and the second air supply duct 103. The inlet of the third heat exchanger 114 is connected to the outlet of the first heat exchanger 105, and the outlet of the third heat exchanger 114 is connected to the throttling structure 109. The third fan 115 is adjacent to the third heat exchanger 114 and is used for exchanging heat for the third heat exchanger 114.

[0082] It should be noted that if heat imbalance occurs in the air supply duct, the return air duct 101 and the dried area 126 as a whole, or if a certain temperature of the dried area 126 needs to be maintained, the heat pump drying system needs to dissipate heat to the outside; Figure 7 In the illustrated embodiment, heat can be exchanged with the outside through the third heat exchanger 114, and the temperature of the dried area 126 can be maintained or adjusted through different operation controls.

[0083] See also Figure 8 Furthermore, the high-efficiency heat pump drying system 100 also includes a first water receiving pan 110 and a first drain pipe 111. The first water receiving pan 110 is installed below the second heat exchanger 106. The first drain pipe 111 is connected to the first water receiving pan 110 and is used to drain the water in the first water receiving pan 110 to the third heat exchanger 114.

[0084] See also Fig. 9 In an optional embodiment, the high-efficiency heat pump drying system 100 also includes a fourth heat exchanger 116, which is located outside the return air duct 101, the first air supply duct 102 and the second air supply duct 103. The fourth heat exchanger 116 includes a first pipe and a second pipe that are isolated from each other. The two ends of the first pipe are respectively connected to the outlet of the first heat exchanger 105 and the throttling structure 109. The first pipe and the second pipe are used to exchange heat between the refrigerant and the external cold source.

[0085] The external cold source may be external air, water or other substances; one passage of the fourth heat exchanger 116 is used for the refrigerant, and the other passage may be used for the external cold source, thereby achieving heat exchange between the refrigerant and the external cold source.

[0086] See also Fig.10 In an optional embodiment, the high-efficiency heat pump drying system 100 also includes a fifth heat exchanger 117, which is located outside the return air duct 101, the first air supply duct 102 and the second air supply duct 103, the inlet of the fifth heat exchanger 117 is connected to the outlet of the first heat exchanger 105, and the outlet of the fifth heat exchanger 117 is connected to the throttling structure 109; the high-efficiency heat pump drying system 100 also includes a water pump 118, a second water receiving tray 119, a second drain pipe 120 and a fifth fan 121, the second water receiving tray 119 is installed below the fifth heat exchanger 117, the second drain pipe 120 is connected to the second water receiving tray 119, the water pump 118 is connected to the second water receiving tray 119, and is used to spray the water in the second water receiving tray 119 to the surface of the fifth heat exchanger 117, and the fifth fan 121 is used to make air flow through the surface of the fifth heat exchanger 117 and vaporize at least part of the water on the surface.

[0087] It should be noted that in Fig.10In the illustrated embodiment, the refrigerant flows through the inner side of the fifth heat exchanger 117 and is cooled by the sprayed water on its outer surface. Since the fifth fan 121 drives the air to flow through the outer surface of the fifth heat exchanger 117, the vaporization of water can be promoted, and the latent heat of vaporization of water can take away a large amount of heat of the refrigerant inside the fifth heat exchanger 117. By spraying water on the surface of the fifth heat exchanger 117, the latent heat of vaporization of water is used to improve the heat exchange efficiency and reduce the heat exchange area, thereby reducing the internal volume of the fifth heat exchanger 117, and reducing the impact of the change of the refrigerant on the stability of the system operation under different working conditions during the operation of the refrigeration system.

[0088] In an optional embodiment, the high-efficiency heat pump drying system 100 also includes a first water receiving pan 110 and a first drain pipe 111. The first water receiving pan 110 is installed below the second heat exchanger 106. The first drain pipe 111 is connected to the first water receiving pan 110 and is used to drain the water in the first water receiving pan 110 to the second water receiving pan 119 or the pipeline in front of the water pump 118.

[0089] It should be noted that by introducing the water condensed from the air in the air duct into the second water receiving pan 119 or the pipeline in front of the water pump 118, the water participates in the heat exchange work of the fifth heat exchanger 117, and fully utilizes the latent heat of vaporization of the condensed water and a part of the sensible heat, which is a recycling of the condensed water, improves the overall efficiency of the system operation, and reduces the operating cost. In this embodiment, the recycling of the condensed water is sufficient for the use of the fifth heat exchanger 117.

[0090] See also Fig.11 In an optional embodiment, the high-efficiency heat pump drying system 100 also includes a first water receiving tray 110, a first drain pipe 111 and a sixth heat exchanger 122. The sixth heat exchanger 122 is located in the first air supply duct 102 and is arranged close to the second heat exchanger 106, so that the air passes through the sixth heat exchanger 122 and the second heat exchanger 106 in sequence. The first water receiving tray 110 is installed below the second heat exchanger 106 and the sixth heat exchanger 122. The first drain pipe 111 is connected to the first water receiving tray 110 for draining the water in the first water receiving tray 110 to the outside of the air duct.

[0091] See also Fig.12 In an optional embodiment, the high-efficiency heat pump drying system 100 also includes a third heat exchanger 114 and a third fan 115. The third heat exchanger 114 is located outside the return air duct 101, the first air supply duct 102 and the second air supply duct 103. The inlet of the third heat exchanger 114 is connected to the outlet of the first heat exchanger 105, and the outlet of the third heat exchanger 114 is connected to the throttling structure 109. The third fan 115 is adjacent to the third heat exchanger 114 and is used for exchanging heat for the third heat exchanger 114.

[0092] See also Fig.13In an optional embodiment, the high-efficiency heat pump drying system 100 also includes a fifth heat exchanger 117, which is located outside the return air duct 101, the first air supply duct 102 and the second air supply duct 103, the inlet of the fifth heat exchanger 117 is connected to the outlet of the first heat exchanger 105, and the outlet of the fifth heat exchanger 117 is connected to the throttling structure 109; the high-efficiency heat pump drying system 100 also includes a water pump 118, a second water receiving tray 119, a second drain pipe 120 and a fifth fan 121, the second water receiving tray 119 is installed below the fifth heat exchanger 117, the second drain pipe 120 is connected to the second water receiving tray 119, the water pump 118 is connected to the second drain pipe 120, and is used to drain the water in the second water receiving tray 119 to the sixth heat exchanger 122, and the fifth fan 121 is used to make air flow through the surface of the fifth heat exchanger 117 and vaporize at least part of the water on the surface.

[0093] In some application cases, on the one hand, a certain amount of heat can be discharged from the system through the fifth heat exchanger 117, and on the other hand, the spray water on the surface of the fifth heat exchanger 117 can be used as a cold source for the sixth heat exchanger 122, so that the air in the first air supply duct 102 is further cooled, and more water is condensed from the air; after the water in the sixth heat exchanger 122 is heated, it is sprayed to the surface of the fifth heat exchanger 117 through the water spraying device 124. Since the fifth fan 121 drives the air to flow through its surface, it will promote the gasification of water, thereby achieving the purpose of cooling by spraying water and cooling the refrigerant inside the fifth heat exchanger 117. In this way, the water output in the air duct can be increased, and the air supply temperature can also be adjusted, that is, the temperature of the drying room area can be indirectly adjusted.

[0094] See also Fig.14 In an optional embodiment, the high-efficiency heat pump drying system 100 also includes a connecting valve 123, which is arranged in the second drainage pipe 120 and is used to drain water in the second drainage pipe 120 to the sixth heat exchanger 122 or the fifth heat exchanger 117.

[0095] In an optional embodiment, at least one of the return air duct 101 , the first air supply air duct 102 and the second air supply air duct 103 is provided with an air valve for adjusting the air volume.

[0096] By adjusting the opening of the air valve 127, the air volume from the first air supply duct 102 and the second air supply duct 103 is adjusted. After adjusting the air volume, the temperature and relative humidity of the air at the outlet of the air supply duct can be adjusted to meet the requirements of the air supply state under different application conditions and corresponding to different conditions. The embodiment of the present invention does not require the specific structure of the air valve.

[0097] See also Fig.15In an optional embodiment, in an optional implementation manner, the high-efficiency heat pump drying system 100 also includes a drying area 126, the return air duct 101 is connected to the drying area 126 through the air duct, the first supply air duct 102 is connected to the material feed port of the drying area 126 through the air duct, the return air duct 101 is connected to the material discharge port of the drying area 126 through the air duct, and the second supply air duct 103 is connected to the material inlet and outlet of the drying area 126.

[0098] Furthermore, the high-efficiency heat pump drying system 100 also includes an adjusting air valve 127 . The second air supply duct 103 is connected to the drying area 126 through the duct. The adjusting air valve 127 is installed in the duct and is used to control the air outlet position of the duct in the drying area 126 .

[0099] Furthermore, the air duct between the second air supply duct 103 and the drying area 126 includes a plurality of sub-ducts 128, and the regulating air valve 127 cooperates with the plurality of sub-ducts 128 to connect one or more of the plurality of sub-ducts 128, thereby controlling the air outlet position of the air duct in the drying area 126. In addition, the sub-ducts 128 can be connected to the drying area 126 at different positions, and the regulating air valve 127 can selectively open at least one sub-duct 128, thereby realizing air outlet to the drying area 126 at the position corresponding to the sub-duct 128.

[0100] Furthermore, the high-efficiency heat pump drying system 100 also includes an adjustment mechanism, which is connected to the air duct in a transmission manner and is used to adjust the connection position between the air duct and the drying area 126. Further, for a solution with multiple sub-air ducts, the adjustment mechanism is connected to at least one of the multiple sub-air ducts 128 in a transmission manner and is used to adjust the connection position between the sub-air duct 128 and the drying area 126, so as to guide the gas to the corresponding position of the drying area 126, and realize the drying process of different positions and different objects to be dried. Optionally, the adjustment mechanism can be a motor device, a hydraulic device, a pneumatic device, etc. The adjustment mechanism can automatically control the connection position between the sub-air duct and the drying area, so as to facilitate the use of the user.

[0101] The high-efficiency heat pump drying system 100 provided in the embodiment of the present invention: by exchanging heat with the inlet exhaust temperature section of the first heat exchanger 105 through the dehumidified air, and by exchanging heat with the exhaust gas, the sensible heat is fully utilized, and a higher supply air temperature can be achieved at a lower condensing temperature, thereby improving the efficiency of heat pump drying.

[0102] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-efficiency heat pump drying system, characterized in that: It comprises a return air duct (101), a first air supply duct (102), a second air supply duct (103), a compressor (104), a first heat exchanger (105), a second heat exchanger (106) and a throttling structure (109); The return air duct (101) is respectively connected to the first air supply duct (102) and the second air supply duct (103), so that the air in the return air duct flows to the first air supply duct (102) and the second air supply duct (103); The first heat exchanger (105) comprises a first heat exchange part (1051) located in the first air supply duct (102) and a second heat exchange part (1052) located in the second air supply duct (103), the first heat exchange part (1051) is connected to the second heat exchange part (1052), an inlet of the first heat exchanger (105) is arranged at the first heat exchange part (1051), and an outlet of the first heat exchanger (105) is arranged at the second heat exchange part (1052); The second heat exchanger (106) is installed in the first air supply duct (102), and allows air to pass through the second heat exchanger (106) and the first heat exchange part (1051) in sequence; The exhaust port of the compressor (104) is connected to the inlet of the first heat exchanger (105), the outlet of the first heat exchanger (105) is connected to one end of the throttling structure (109), the other end of the throttling structure (109) is connected to the inlet of the second heat exchanger (106), and the outlet of the second heat exchanger (106) is connected to the intake port of the compressor (104).

2. The high-efficiency heat pump drying system according to claim 1, characterized in that: The heat pump drying system further comprises a first fan (107) and a second fan (108), wherein the first fan (107) is installed in the first air supply duct (102), and the second fan (108) is installed in the second air supply duct (103); The first fan (107) is used to introduce the air in the return air duct (101) into the first air supply duct (102), and the second fan (108) is used to introduce the air in the return air duct (101) into the second air supply duct (103).

3. The high-efficiency heat pump drying system according to claim 1, characterized in that: The high-efficiency heat pump drying system (100) further comprises a first water receiving pan (110) and a first drain pipe (111); the first water receiving pan (110) is installed below the second heat exchanger (106); the first drain pipe (111) is connected to the first water receiving pan (110) and is used to discharge water in the first water receiving pan (110) to the outside of the air duct.

4. The high-efficiency heat pump drying system according to any one of claims 1 to 3, characterized in that: A vent (112) is provided between the first air supply duct (102) and the second air supply duct (103), and the vent (112) is in communication with the first air supply duct (102) and the second air supply duct (103).

5. The high-efficiency heat pump drying system according to claim 4, characterized in that: The high-efficiency heat pump drying system (100) further comprises an air valve regulating member (113), wherein the air valve regulating member (113) is installed at the vent (112) and is used to regulate the air volume of the vent (112).

6. The high-efficiency heat pump drying system according to claim 4, characterized in that: The heat pump drying system further comprises a first fan (107) and a second fan (108), wherein the first fan (107) is installed in the first air supply duct (102), and the second fan (108) is installed in the second air supply duct (103); The first fan (107) is located between the vent (112) and the second heat exchanger (106), and the second fan (108) is located between the vent (112) and the second heat exchange portion (1052), or is located downstream of the second heat exchange portion (1052); Alternatively, the second fan (108) is located on a side of the vent (112) away from the second heat exchange part (1052), and the first fan (107) is located between the vent (112) and the first heat exchange part (1051), or downstream of the first heat exchange part (1051).

7. The high-efficiency heat pump drying system according to any one of claims 1 to 3, characterized in that: The first heat exchanger (105) includes a plurality of heat exchange tube flows, each of the heat exchange tube flows is connected to a refrigerant inlet and a refrigerant outlet of the first heat exchanger (105), the heat exchange tube flow includes a plurality of heat exchange tubes, and the plurality of heat exchange tubes are continuously connected; The multiple heat exchange tube processes include at least one heat exchange tube process from the first air supply duct (102) to the second air supply duct (103); Alternatively, the plurality of heat exchange tube processes all extend from the first air supply duct (102) to the second air supply duct (103).

8. The high-efficiency heat pump drying system according to any one of claims 1 to 3, characterized in that: The first heat exchanger (105) includes two heat exchangers and a connecting pipe (1054) connected to the two heat exchangers, one of the two heat exchangers is located in the first air supply duct (102) and is the first heat exchange part (1051), and the other heat exchanger is located in the second air supply duct (103) and is the second heat exchange part (1052).

9. The high-efficiency heat pump drying system according to any one of claims 1 to 3, characterized in that: A duct boundary plate (1053) is provided on the first heat exchanger (105), the first heat exchange part (1051) and the second heat exchange part (1052) are respectively located on both sides of the duct boundary plate (1053), a partition plate is provided between the first air supply duct (102) and the second air supply duct (103), and the duct boundary plate (1053) is connected to the partition plate.

10. The high-efficiency heat pump drying system according to any one of claims 1 to 3, characterized in that: The second heat exchanger (106) comprises a third heat exchange section and a fourth heat exchange section connected to each other; The third heat exchange part is located in the first air supply duct (102), the fourth heat exchange part is located in the second air supply duct (103), the inlet of the second heat exchanger (106) is arranged in the fourth heat exchange part, and the outlet of the second heat exchanger (106) is arranged in the third heat exchange part; The heat pump drying system also includes a first fan (107) and a second fan (108), wherein the first fan (107) is located between the first heat exchange part (1051) and the third heat exchange part, and the second fan (108) is located between the second heat exchange part (1052) and the fourth heat exchange part.

11. The high-efficiency heat pump drying system according to claim 10, characterized in that: The second heat exchanger (106) includes a plurality of heat exchange tube flows, each of the heat exchange tube flows is connected to a refrigerant inlet and a refrigerant outlet of the second heat exchanger (106), the heat exchange tube flow includes a plurality of heat exchange tubes, and the plurality of heat exchange tubes are continuously connected; The multiple heat exchange tube processes include at least one heat exchange tube process from the first air supply duct (102) to the second air supply duct (103); Alternatively, the plurality of heat exchange tube processes all extend from the first air supply duct (102) to the second air supply duct (103).

12. The high-efficiency heat pump drying system according to any one of claims 1 to 3, characterized in that: The high-efficiency heat pump drying system (100) also includes a moving mechanism, and a partition plate is provided between the first air supply duct (102) and the second air supply duct (103). The moving mechanism is transmission-connected to the first heat exchanger (105) or the partition plate, and is used to enable the first heat exchanger (105) and the partition plate to move relative to each other, so as to adjust the heat exchange area ratio of the first heat exchange part (1051) and the second heat exchange part (1052) in the first air supply duct (102) and the second air supply duct (103), respectively.

13. The high-efficiency heat pump drying system according to any one of claims 1 to 3, characterized in that: The high-efficiency heat pump drying system (100) also includes a third heat exchanger (114) and a third fan (115); the third heat exchanger (114) is located outside the return air duct (101), the first air supply duct (102) and the second air supply duct (103); the inlet of the third heat exchanger (114) is connected to the outlet of the first heat exchanger (105); the outlet of the third heat exchanger (114) is connected to the throttling structure (109); and the third fan (115) is used to exchange heat with the third heat exchanger (114).

14. The high-efficiency heat pump drying system according to claim 13, characterized in that: The high-efficiency heat pump drying system (100) further comprises a first water receiving pan (110) and a first drain pipe (111); the first water receiving pan (110) is installed below the second heat exchanger (106); the first drain pipe (111) is connected to the first water receiving pan (110) and is used to drain water in the first water receiving pan (110) to the third heat exchanger (114).

15. The high-efficiency heat pump drying system according to any one of claims 1 to 3, characterized in that: The high-efficiency heat pump drying system (100) also includes a fourth heat exchanger (116), which is located outside the return air duct (101), the first air supply duct (102) and the second air supply duct (103). The fourth heat exchanger (116) includes a first pipe and a second pipe that are isolated from each other. The two ends of the first pipe are respectively connected to the outlet of the first heat exchanger (105) and the throttling structure (109). The first pipe and the second pipe are used to exchange heat between the refrigerant and the external cold source.

16. The high-efficiency heat pump drying system according to any one of claims 1 to 3, characterized in that: The high-efficiency heat pump drying system (100) further comprises a fifth heat exchanger (117), wherein the fifth heat exchanger (117) is located outside the return air duct (101), the first air supply air duct (102) and the second air supply air duct (103), wherein the inlet of the fifth heat exchanger (117) is connected to the outlet of the first heat exchanger (105), and the outlet of the fifth heat exchanger (117) is connected to the throttling structure (109); The high-efficiency heat pump drying system (100) further comprises a water pump (118), a second water receiving tray (119), a second drain pipe (120), a fifth fan (121) and a water spraying device (124); the second water receiving tray (119) is installed below the fifth heat exchanger (117); the second drain pipe (120) is connected to the second water receiving tray (119) and the water spraying device (124) respectively; the water pump (118) is connected to the second water receiving tray (119) and is used to pass the water in the second water receiving tray (119) through the second drain pipe (120) and the water spraying device (124) and spray it onto the surface of the fifth heat exchanger (117); the fifth fan (121) is used to allow air to flow through the surface of the fifth heat exchanger (117).

17. The high-efficiency heat pump drying system according to claim 16, characterized in that: The high-efficiency heat pump drying system (100) further comprises a first water receiving pan (110) and a first drain pipe (111); the first water receiving pan (110) is installed below the second heat exchanger (106); the first drain pipe (111) is connected to the first water receiving pan (110) and is used to drain water in the first water receiving pan (110) to the second water receiving pan (119) or the pipeline in front of the water pump (118).

18. The high-efficiency heat pump drying system according to claim 1 or 2, characterized in that: The high-efficiency heat pump drying system (100) also includes a first water receiving tray (110), a first drain pipe (111) and a sixth heat exchanger (122); the sixth heat exchanger (122) is located in the first air supply duct (102) and is arranged close to the second heat exchanger (106) so that the air passes through the sixth heat exchanger (122) and the second heat exchanger (106) in sequence; the first water receiving tray (110) is installed below the second heat exchanger (106) and the sixth heat exchanger (122); the first drain pipe (111) is connected to the first water receiving tray (110) and is used to drain the water in the first water receiving tray (110) to the outside of the duct.

19. The high-efficiency heat pump drying system according to claim 18, characterized in that: The high-efficiency heat pump drying system (100) also includes a third heat exchanger (114) and a third fan (115); the third heat exchanger (114) is located outside the return air duct (101), the first air supply duct (102) and the second air supply duct (103); the inlet of the third heat exchanger (114) is connected to the outlet of the first heat exchanger (105); the outlet of the third heat exchanger (114) is connected to the throttling structure (109); and the third fan (115) is used to exchange heat with the third heat exchanger (114).

20. The high-efficiency heat pump drying system according to claim 18, characterized in that: The high-efficiency heat pump drying system (100) further comprises a fifth heat exchanger (117), wherein the fifth heat exchanger (117) is located outside the return air duct (101), the first air supply air duct (102) and the second air supply air duct (103), wherein the inlet of the fifth heat exchanger (117) is connected to the outlet of the first heat exchanger (105), and the outlet of the fifth heat exchanger (117) is connected to the throttling structure (109); The high-efficiency heat pump drying system (100) further comprises a water pump (118), a second water receiving tray (119), a second drain pipe (120) and a fifth fan (121); the second water receiving tray (119) is installed below the fifth heat exchanger (117); the second drain pipe (120) is connected to the second water receiving tray (119); the water pump (118) is connected to the second drain pipe (120) and is used to drain the water in the second water receiving tray (119) to the sixth heat exchanger (122); and the fifth fan (121) is used to allow air to flow through the surface of the fifth heat exchanger (117).

21. The high-efficiency heat pump drying system according to claim 20, characterized in that: The high-efficiency heat pump drying system (100) further comprises a connecting valve (123), wherein the connecting valve (123) is arranged on the second drainage pipe (120) and is used to divert water in the second drainage pipe (120) to the sixth heat exchanger (122) or the fifth heat exchanger (117).

22. The high-efficiency heat pump drying system according to any one of claims 1 to 3, characterized in that: At least one of the return air duct (101), the first air supply air duct (102) and the second air supply air duct (103) is provided with an air valve, and the air valve is used to adjust the air volume.

23. The high-efficiency heat pump drying system according to claim 1, characterized in that: The high-efficiency heat pump drying system (100) also includes a drying area (126), the first air supply duct (102) is connected to the feed port of the drying area (126) through the duct, the return air duct (101) is connected to the discharge port of the drying area (126) through the duct, and the second air supply duct (103) is connected to the feed port and the discharge port of the drying area (126).

24. The high-efficiency heat pump drying system according to claim 23, characterized in that: The air duct between the second air supply duct (103) and the drying area (126) includes a plurality of sub-ducts (128), and the high-efficiency heat pump drying system (100) also includes an adjusting air valve (127) correspondingly arranged in the plurality of sub-ducts (128), and the adjusting air valve (127) cooperates with the plurality of sub-ducts (128) to connect one or more of the plurality of sub-ducts (128), thereby controlling the air outlet position of the air duct in the drying area (126).

25. The high-efficiency heat pump drying system according to claim 23 or 24, characterized in that: The high-efficiency heat pump drying system (100) also includes an adjusting mechanism, wherein the second air supply duct (103) is connected to the drying area (126) through the duct, and the duct between the second air supply duct (103) and the drying area (126) is movably connected to the drying area (126). The adjusting mechanism is transmission-connected to the duct between the second air supply duct (103) and the drying area (126) for adjusting the connection position between the duct between the second air supply duct (103) and the drying area (126) and the drying area (126).

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