Heat pump drying device

Abstract

The embodiment of the present invention provides a heat pump drying device, which relates to the field of heat pump drying. The heat pump drying device includes a first heat exchanger, a second heat exchanger, a first heat exchange component, a first drying zone and a second drying zone, wherein the first heat exchanger is used to exchange heat with the gas flowing through its surface, and the second heat exchanger is used to exchange heat with the gas flowing through its surface; the first drying zone, the air channel of the second heat exchanger, and the first channel of the first heat exchange component are connected in sequence through pipelines, so that the gas circulates along the first drying zone, the air channel of the second heat exchanger, the first channel of the first heat exchange component and the first drying zone; the second drying zone, the second channel of the first heat exchange component, and the air channel of the first heat exchanger are connected in sequence through pipelines, so that the gas circulates along the second drying zone, the second channel of the first heat exchange component, the air channel of the first heat exchanger and the second drying zone. The embodiment of the present invention can improve the heat exchange efficiency and heat utilization rate.

Description

Technical Field

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

[0002] In the application of conventional closed dryers, dehumidification efficiency is often a key indicator. When it comes to certain drying items and drying processes, the dehumidification efficiency of the existing technology is not high and needs to be improved. Summary of the invention

[0003] The purpose of the present invention is to provide a heat pump drying device, which can further improve the dehumidification efficiency and achieve a greater range of dehumidification capacity with less energy consumption. In particular, for certain drying objects and drying process requirements, it can save energy in a lower range and improve the dehumidification efficiency.

[0004] The present invention provides a heat pump drying device, comprising a first heat exchanger, a second heat exchanger, a first heat exchange component, a first drying zone and a second drying zone, wherein the first heat exchanger is used to exchange heat with gas flowing through its surface, and the second heat exchanger is used to exchange heat with gas flowing through its surface; the first drying zone, the air channel of the second heat exchanger, and the first channel of the first heat exchange component are connected in sequence through pipelines, so that the gas circulates along the first drying zone, the air channel of the second heat exchanger, the first channel of the first heat exchange component and the first drying zone; the second drying zone, the second channel of the first heat exchange component, and the air channel of the first heat exchanger are connected in sequence through pipelines, so that the gas circulates along the second drying zone, the second channel of the first heat exchange component, the air channel of the first heat exchanger and the second drying zone.

[0005] In an optional embodiment, the heat pump drying device also includes a compressor and a throttling device, the exhaust port of the compressor is connected to the refrigerant channel of the first heat exchanger, the throttling device is connected between the refrigerant channel of the first heat exchanger and the refrigerant channel of the second heat exchanger, and the intake port of the compressor is connected to the refrigerant channel of the second heat exchanger.

[0006] It should be understood that, on the basis of the above, a compressor and a throttling device are added, and a compression refrigeration cycle is used to provide a cold source and a heat source for the first heat exchanger and the second heat exchanger respectively, so that high efficiency and energy saving effects are more easily obtained.

[0007] In an optional embodiment, the heat pump drying device also includes a second heat exchange component, the first channel of the second heat exchange component is located upstream of the air side of the second heat exchanger, and the second channel of the second heat exchange component is located downstream of the air side of the second heat exchanger, so that the gas in the first drying zone circulates along the first drying zone, the first channel of the second heat exchange component, the air channel of the second heat exchanger, the second channel of the second heat exchange component, the first channel of the first heat exchange component and the first drying zone in sequence.

[0008] In an optional embodiment, the heat pump drying device also includes a first external cold source; the first external cold source is located upstream or downstream of the second channel of the first heat exchange component, so that the gas in the second drying zone circulates along the second drying zone, the first external cold source, the second channel of the first heat exchange component, the air channel of the first heat exchanger and the second drying zone in sequence, or the gas in the second drying zone circulates along the second drying zone, the second channel of the first heat exchange component, the first external cold source, the air channel of the first heat exchanger and the second drying zone in sequence.

[0009] In an optional embodiment, the heat pump drying device also includes a second external cold source, which is located upstream of the air channel of the second heat exchanger, so that the gas circulates along the first drying zone, the second external cold source, the air channel of the second heat exchanger, the first channel of the first heat exchange component and the first drying zone in sequence.

[0010] In an optional embodiment, the heat pump drying device also includes a second heat exchange component, which has a first channel and a second channel that can exchange heat with each other; the second external cold source is located upstream of the first channel of the second heat exchange component, and is provided with a channel directly connecting the first drying zone and the first channel of the second heat exchange component, so that the gas circulates along the first drying zone, the second external cold source, the first channel of the second heat exchange component, the air channel of the second heat exchanger, the second channel of the second heat exchange component, the first channel of the first heat exchange component and the first drying zone in sequence, or the gas circulates along the first drying zone, the first channel of the second heat exchange component, the air channel of the second heat exchanger, the second channel of the second heat exchange component, the first channel of the first heat exchange component and the first drying zone; or, the second external cold source is connected in parallel with the second heat exchange component, and the gas in the first drying zone is divided into two paths that flow to the second external cold source and the first channel of the second heat exchanger respectively, and converge to the air channel of the second heat exchanger, and then flow to the first drying zone along the air channel of the second heat exchanger, the second channel of the second heat exchange component, and the first channel of the first heat exchange component.

[0011] In an optional embodiment, the heat pump drying device also includes a second external cold source and a second heat exchange component, the second heat exchange component having a first channel and a second channel that can exchange heat with each other, and the second external cold source and the second heat exchange component are both located upstream of the air channel of the second heat exchanger; the second external cold source is located upstream of the first channel of the second heat exchange component, so that the gas circulates along the first drying zone, the second external cold source, the first channel of the second heat exchange component, the air channel of the second heat exchanger, the second channel of the second heat exchange component, the first channel of the first heat exchange component and the first drying zone in sequence; or, the second external cold source is located downstream of the first channel of the second heat exchange component, so that the gas circulates along the first drying zone, the first channel of the second heat exchange component, the second external cold source, the air channel of the second heat exchanger, the second channel of the second heat exchange component, the first channel of the first heat exchange component and the first drying zone in sequence.

[0012] In an optional embodiment, the heat pump drying device also includes a third heat exchanger, the refrigerant channel of the third heat exchanger is located between the first heat exchanger and the second heat exchanger, and the air channel of the third heat exchanger is located downstream of the first channel of the first heat exchange component, so that the gas circulates along the first drying zone, the air channel of the second heat exchanger, the first channel of the first heat exchange component, the air channel of the third heat exchanger and the first drying zone.

[0013] In an optional embodiment, the heat pump drying device also includes a third heat exchange component and a first external cold source, the first heat exchanger has a first air channel and a second air channel, both of which exchange heat with the refrigerant channel of the first heat exchanger, and the second drying zone has at least two groups of circulation passages, wherein the circulation path of the first group of circulation passages in the second drying zone is: the second drying zone, the second channel of the first heat exchange component, the first channel of the third heat exchange component, the first air channel of the first heat exchanger and the second drying zone; the circulation path of the second group of circulation passages in the second drying zone is: the second drying zone, the second channel of the third heat exchange component, the first external cold source, the second air channel of the first heat exchanger and the second drying zone; the first air channel and the second air channel of the first heat exchanger both exchange heat with the refrigerant channel of the first heat exchanger.

[0014] In an optional embodiment, the second drying zone also has a third group of circulation passages, and the first heat exchanger also has a third air channel for exchanging heat with the refrigerant channel of the first heat exchanger, and the circulation path of the third group of circulation passages in the second drying zone is: the second drying zone, the third air channel of the first heat exchanger, and the second drying zone, wherein the third air channel of the first heat exchanger exchanges heat with the refrigerant channel of the first heat exchanger.

[0015] In an optional embodiment, the heat pump drying device also includes a fourth heat exchange component, and the first drying zone has two groups of circulation passages; wherein the circulation path of the first group of circulation passages in the first drying zone is: the first drying zone, the first channel of the second heat exchanger, the air channel of the first heat exchange component and the first drying zone; the circulation path of the second group of circulation passages in the first drying zone is: the first drying zone, the first channel of the fourth heat exchange component and the first drying zone; the circulation path of the second group of circulation passages in the second drying zone is: the second drying zone, the second channel of the fourth heat exchange component, the second channel of the third heat exchange component, the first external cold source, the second air channel of the first heat exchanger and the second drying zone.

[0016] In an optional embodiment, the heat pump drying device also includes a fifth heat exchange component; the circulation path of the second group of circulation passages in the second drying zone is: the second drying zone, the second channel of the fourth heat exchange component, the second channel of the third heat exchange component, the first external cold source, the first channel of the fifth heat exchange component, the second air channel of the first heat exchanger and the second drying zone; the circulation path of the third group of circulation passages in the second drying zone is: the second drying zone, the second channel of the fifth heat exchange component, the third air channel of the first heat exchanger and the second drying zone.

[0017] In an optional embodiment, the heat pump drying device also includes a first external cold source, a second heat exchange component, and a sixth heat exchange component, the sixth heat exchange component having a first channel and a second channel for mutual heat exchange; the first channel of the second heat exchange component is located upstream of the air side of the second heat exchanger, and the second channel of the second heat exchange component is located downstream of the air side of the second heat exchanger, the first external cold source is located upstream of the second channel of the first heat exchange component, and the sixth heat exchange component is located downstream of the first channel of the second heat exchange component, so that the gas circulates along the first drying zone, the first channel of the second heat exchange component, the first channel of the sixth heat exchange component, the air channel of the second heat exchange component, the second channel of the second heat exchange component, the first channel of the first heat exchange component, and the first drying zone in sequence; the second channel of the sixth heat exchange component is located downstream of the second channel of the first heat exchange component, so that the gas circulates along the second drying zone, the first external cold source, the second channel of the first heat exchange component, the second channel of the sixth heat exchange component, the air channel of the first heat exchanger, and the second drying zone in sequence.

[0018] In an optional embodiment, the heat pump drying device also includes an eighth heat exchange component and a first external cold source, so that the gas circulates along the second drying zone, the first channel of the eighth heat exchange component, the second channel of the first heat exchange component, the second channel of the eighth heat exchange component, the first external cold source, the air channel of the first heat exchanger and the second drying zone.

[0019] In an optional embodiment, the heat pump drying device also includes a branch compressor, a branch throttling device, a fourth heat exchanger and a fifth heat exchanger, the exhaust port of the branch compressor is connected to the first port of the fourth heat exchanger, the second port of the fourth heat exchanger is connected to the first port of the branch throttling device, the second port of the branch throttling device is connected to the first port of the fifth heat exchanger, and the second port of the fifth heat exchanger is connected to the suction port of the branch compressor; the gas circulation path of the first drying zone is: the first drying zone, the air channel of the second heat exchanger, the first channel of the first heat exchange component, the air channel of the fourth heat exchanger, and the first drying zone; the gas circulation path of the second drying zone is: the second drying zone, the second channel of the first heat exchange component, the air channel of the fifth heat exchanger, the air channel of the first heat exchanger, and the second drying zone.

[0020] In an optional embodiment, the heat pump drying device also includes a second heat exchange component, the first channel of the second heat exchange component is located upstream of the air side of the second heat exchanger, and the second channel of the second heat exchange component is located downstream of the air side of the second heat exchanger, so that the gas in the first drying zone circulates along the first drying zone, the first channel of the second heat exchange component, the air channel of the second heat exchanger, the second channel of the second heat exchange component, the first channel of the first heat exchange component, the air channel of the fourth heat exchanger and the first drying zone in sequence.

[0021] In an optional embodiment, the heat pump drying device also includes a cavity and a partition mechanism arranged in the cavity, the partition mechanism divides the cavity into the first drying area and the second drying area, and the cavity is provided with a feed port in the first drying area and a discharge port in the second drying area.

[0022] In an optional embodiment, the heat pump drying device also includes a conveying mechanism, one end of which is located in the first drying zone and close to the feed port, and the other end is located in the second drying zone and close to the discharge port; or, the heat pump drying device also includes a first conveying mechanism and a second conveying mechanism, the first conveying mechanism is connected to the feed port, the second conveying mechanism is connected to the discharge port, the first conveying mechanism and the second conveying mechanism are connected or integrally arranged, or the first conveying mechanism and the second conveying mechanism are spaced apart from each other.

[0023] In an optional embodiment, the heat pump drying device also includes a precooling heat exchanger and a spray device, the precooling heat exchanger is arranged between the first heat exchanger and the first heat exchange component, and / or, is arranged between the second heat exchanger and the first drying area; the precooling heat exchanger has a first channel and a second channel, the first channel of the precooling heat exchanger is used to circulate the gas in the drying area, the second channel of the precooling heat exchanger is used to circulate outside air, and the spray device is used to cool the gas flowing into the second channel of the precooling heat exchanger.

[0024] In an optional embodiment, a filler or a wet film is provided upstream of the second channel of the precooling heat exchanger, and the spraying device is capable of spraying the filler or the wet film.

[0025] In an optional embodiment, the heat pump drying device also includes a water receiving pan and a drain pipe. The water receiving pan is arranged below the second heat exchanger to receive condensed water. The drain pipe is connected to the water receiving pan and the spray device to drain the condensed water in the water receiving pan to the spray device.

[0026] The heat pump drying device provided by the embodiment of the present invention provides cooling capacity through the second heat exchanger, so that the air flowing through its surface is cooled and dehumidified, and moisture is condensed. The air in the first channel of the first heat exchanger assembly is heated and sent to the first drying area, and the air in the second channel of the first heat exchanger assembly is cooled and dehumidified, and moisture is condensed, and then heated again by the first heat exchanger and sent to the second drying area. Through the multi-stage heat exchange principle, the cooling capacity provided by the first heat exchanger is used twice, and the dehumidification capacity is provided twice. Similarly, the heat provided by the second heat exchanger is also used twice. Therefore, the overall effect is higher and more energy-saving. In addition, the first heat exchanger and the second heat exchanger can make more use of waste cooling, waste heat or other low-grade energy to achieve full utilization of energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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.

[0028] Figure 1 A schematic diagram of the structure of a heat pump drying device provided in an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of a heat pump drying device including a second heat exchange component provided in an embodiment of the present invention;

[0030] Figure 3 A schematic diagram of a heat pump drying device including a first external cold source provided by an embodiment of the present invention;

[0031] Figure 4 A schematic diagram of a first external cold source provided in an embodiment of the present invention when it is located upstream of the second channel of the first heat exchange component;

[0032] Figure 5 A schematic diagram of a first external cold source provided in an embodiment of the present invention when it is located downstream of the second channel of the first heat exchange component and includes a second heat exchange component;

[0033] Figure 6 A schematic diagram of a heat pump drying device including a second external cold source provided by an embodiment of the present invention;

[0034] Figure 7 For Figure 6 A schematic diagram of adding a second heat exchange component on the basis of

[0035] Figure 8 For Figure 7A schematic diagram of a case where the second external cold source is located downstream of the first channel of the second heat exchange component;

[0036] Fig. 9 For the general Figure 7 Schematic diagram of the second external cold source in the bypass setting;

[0037] Fig.10 For the general Figure 7 A schematic diagram of a second external cold source and a second heat exchange component being arranged in parallel;

[0038] Fig.11 A schematic diagram of a third heat exchanger provided in a refrigerant circulation pipeline in an embodiment of the present invention;

[0039] Fig.12 For Fig.11 A schematic diagram of a second heat exchange component and a second external cold source being arranged on the base;

[0040] Fig.13 A schematic diagram of a second drying zone provided in an embodiment of the present invention including three air channels and a third heat exchange component;

[0041] Fig.14 For Fig.13 A schematic diagram of adding a fourth heat exchange component on the basis of

[0042] Fig.15 For Fig.13 and Fig.14 A schematic diagram of adding a fifth heat exchange component on the basis of

[0043] Fig.16 is a schematic diagram of an embodiment of the present invention including a sixth heat exchange component;

[0044] Fig.17 is a schematic diagram of an eighth heat exchange component included in an embodiment of the present invention;

[0045] Fig.18 The diagram is a schematic diagram of an embodiment of the present invention including a branch compressor.

[0046] Icons: 100-heat pump drying device; 101-first heat exchanger; 102-second heat exchanger; 103-compressor; 104-throttling device; 105-third heat exchanger; 106-branch compressor; 107-branch throttling device; 108-fourth heat exchanger; 109-fifth heat exchanger; 110-first heat exchange component; 120-second heat exchange component; 130-third heat exchange component; 140-fourth heat exchange component; 150-fifth heat exchange component; 160-sixth heat exchange component; 180-eighth heat exchange component; 200-cavity; 201-first drying area; 2011-feed port; 202-second drying area; 2021-discharge port; 203-partitioning mechanism; 204-first transmission mechanism; 205-second transmission mechanism; 210-first external cold source; 220-second external cold source. DETAILED DESCRIPTION

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] See also Figure 1 , which shows a heat pump drying device 100 provided by an embodiment of the present invention, the heat pump drying device 100 can improve the dehumidification efficiency and achieve a larger range of dehumidification capacity with less energy consumption.

[0054] The present invention provides a heat pump drying device 100 including a first heat exchanger 101, a second heat exchanger 102, a first heat exchange component 110, a first drying zone 201 and a second drying zone 202, wherein the first heat exchanger 101 is used to exchange heat with gas flowing through its surface, and the second heat exchanger 102 is used to exchange heat with gas flowing through its surface; the first drying zone 201, the air channel of the second heat exchanger 102, and the first channel of the first heat exchange component 110 are connected in sequence through pipelines so that the gas circulates along the first drying zone 201, the air channel of the second heat exchanger 102, the first channel of the first heat exchange component 110 and the first drying zone 201; the second drying zone 202, the second channel of the first heat exchange component 110, and the air channel of the first heat exchanger 101 are connected in sequence through pipelines so that the gas circulates along the second drying zone 202, the second channel of the first heat exchange component 110, the air channel of the first heat exchanger 101 and the second drying zone 202.

[0055] It should be pointed out that in the embodiment of the present invention, the second heat exchanger 102 provides cooling capacity, so that the air flowing through its surface is cooled and dehumidified, and moisture is condensed. The air in the first channel of the first heat exchanger 101 component is heated and sent to the first drying area 201, and the air in the second channel of the first heat exchanger 101 component is cooled and dehumidified, and moisture is condensed, and then it is heated again by the first heat exchanger 101 and sent to the second drying area 202. Through the multi-stage heat exchange principle, the cooling capacity provided by the first heat exchanger 101 is used twice, and the dehumidification capacity is provided twice. Similarly, the heat provided by the second heat exchanger 102 is also used twice. Therefore, the overall effect is higher and more energy-saving. In addition, the first heat exchanger 101 and the second heat exchanger 102 can make more use of waste cooling, waste heat or other low-grade energy to make full use of energy.

[0056] For the arrangement of the first drying zone 201 and the second drying zone 202, optionally, as Figure 1 As shown, the heat pump drying device 100 also includes a cavity 200 and a partition mechanism 203 arranged in the cavity 200. The partition mechanism 203 divides the cavity 200 into a first drying area 201 and a second drying area 202. The cavity 200 is provided with a feed port 2011 in the first drying area 201 and a discharge port 2021 in the second drying area 202.

[0057] It should be understood that the partition mechanism 203 is used to partition the chamber into the first drying area 201 and the second drying area 202, and the partition mechanism 203 can be moved to adjust the area range of the first drying area 201 and the second drying area 202. In the embodiment of the present invention, the heat pump drying device 100 may also include a first transmission mechanism 204 and a second transmission mechanism 205, the first transmission mechanism 204 is connected to the feed port 2011, the second transmission mechanism 205 is connected to the discharge port 2021, the first transmission mechanism 204 and the second transmission mechanism 205 are connected or integrally arranged, or the first transmission mechanism 204 and the second transmission mechanism 205 are spaced apart from each other. The first transmission mechanism 204 and the second transmission mechanism 205 can be implemented by transmission mechanisms such as chains and conveyor belts.

[0058] In addition, the first drying area 201 and the second drying area 202 may be arranged vertically, horizontally, frontally, etc. The embodiment of the present invention does not make any specific requirements or limitations on the arrangement of the first drying area 201 and the second drying area 202 .

[0059] At the same time, it should be noted that there is no specific requirement or limitation on the temperature of the first drying zone 201 and the second drying zone 202, that is, the temperature of the first drying zone 201 may be greater than the temperature of the second drying zone 202, the temperature of the first drying zone 201 may be less than the temperature of the second drying zone 202, or the temperature of the first drying zone 201 and the temperature of the second drying zone 202 may be equal. In an optional embodiment, the temperature of the second drying zone 202 is higher than the temperature of the first drying zone 201 to further improve the heat exchange and dehumidification effect.

[0060] Furthermore, the heat pump drying device 100 may also include a compressor 103 and a throttling device 104, the exhaust port of the compressor 103 is connected to the first heat exchanger 101, the throttling device 104 is connected between the first heat exchanger 101 and the second heat exchanger 102, and the air intake port of the compressor 103 is connected to the second heat exchanger 102.

[0061] At this time, the compression refrigeration cycle can be used to provide a cold source and a heat source for the first heat exchanger 101 and the second heat exchanger 102 respectively, so that high efficiency and energy saving effects are easier to obtain, so that the use of the heat pump drying device 100 is not limited to waste cold and heat sources and other conditions.

[0062] See also Figure 2 In an optional embodiment, the heat pump drying device 100 also includes a second heat exchange component 120, the first channel of the second heat exchange component 120 is located upstream of the air side of the second heat exchanger 102, and the second channel of the second heat exchange component 120 is located downstream of the air side of the second heat exchanger 102, so that the gas in the first drying zone 201 circulates along the first drying zone 201, the first channel of the second heat exchange component 120, the air channel of the second heat exchanger 102, the second channel of the second heat exchange component 120, the first channel of the first heat exchange component 110 and the first drying zone 201 in sequence.

[0063] It should be pointed out that, in this embodiment, the first channel of the second heat exchange component 120 can allow the air to be cooled before flowing through the second heat exchanger 102, and then cooled by the second heat exchanger 102, and then heated through the second channel of the second heat exchange component 120. This can further increase the cooling capacity of the air in the cooling stage, and can also increase the dehumidification capacity and thus improve efficiency.

[0064] See also Figures 3 to 5 In an optional embodiment, the heat pump drying device 100 further includes a first external cold source 210; the first external cold source 210 is located upstream or downstream of the second channel of the first heat exchange component 110 (wherein, Figure 3 For downstream, Figure 4 and Figure 5is upstream), so that the gas in the second drying zone 202 circulates along the second drying zone 202, the first external cold source 210, the second channel of the first heat exchange component 110, the air channel of the first heat exchanger 101 and the second drying zone 202 in sequence (Figure); or, the gas in the second drying zone 202 circulates along the second drying zone 202, the second channel of the first heat exchange component 110, the first external cold source 210, the air channel of the first heat exchanger 101 and the second drying zone 202 in sequence.

[0065] It should be noted that in some drying objects and drying process, due to the heat imbalance of the whole system, a certain amount of cold needs to be supplemented, or in some drying objects and drying process, the temperature of the drying area needs to be adjusted, and a certain amount of heat needs to be supplemented or consumed. In the embodiment of the present invention, the first external cold source 210 can be used to supplement the cold, and when used as supplementary cold, the dehumidification capacity can be further increased and the efficiency can be improved.

[0066] In addition, it is worth pointing out that see Figure 5 The heat pump drying device 100 may include a second heat exchange component 120 and a first external cold source 210 at the same time, so as to further increase the dehumidification capacity and improve the efficiency.

[0067] See also Figure 6 In an optional embodiment, the heat pump drying device 100 also includes a second external cold source 220, which is located upstream or downstream of the air channel of the second heat exchanger 102, so that the gas circulates along the first drying zone 201, the second external cold source 220, the air channel of the second heat exchanger 102, the first channel of the first heat exchange component 110, and the first drying zone 201 in sequence.

[0068] It should be noted that in some drying objects and drying process, due to the heat imbalance of the whole system, a certain amount of cold needs to be supplemented, or in some drying objects and drying process, the temperature of the drying area needs to be adjusted, and a certain amount of heat needs to be supplemented or consumed. When used as supplementary cold, the dehumidification capacity and efficiency can be further improved. The cold generated by the second external cold source 220 can be exchanged through the first heat exchange component 110 to increase the utilization of the primary cold, thereby further improving the dehumidification capacity and efficiency. For example, when there is no second external cold source 220, the second heat exchanger 102 has a cooling capacity of 10kw, the first heat exchanger 101 has a heat capacity of 12kw, and the first heat exchange component 110 is a 10kw heat exchanger. When there is a second external cold source 220, the second external cold source 220 can provide a cooling capacity of 2kw, so that the first heat exchange component 110 becomes a 12kw heat exchange capacity, and the 2kw cooling capacity provided by the second external cold source 220 produces a primary dehumidification effect (increases the dehumidification capacity in the first air duct), and the first heat exchange component 110 increases the dehumidification capacity generated by the 2kw heat exchange capacity (increases the dehumidification capacity in the second air duct), which is equivalent to the pre-cooling capacity of the second external cold source 220, and the dehumidification effect is produced twice, thereby improving the dehumidification capacity and efficiency. Moreover, the second external cold source 220 can use low-grade energy for pre-cooling.

[0069] See also Figure 7 and Figure 8 In an optional embodiment, the heat pump drying device 100 also includes a second heat exchange component 120, which has a first channel and a second channel that can exchange heat with each other; the second external cold source 220 is located upstream or downstream of the first channel of the second heat exchange component 120.

[0070] See also Fig. 9 , a channel is provided that directly connects the first drying zone 201 and the first channel of the second heat exchange component 120, so that the gas circulates along the first drying zone 201, the second external cold source 220, the first channel of the second heat exchange component 120, the air channel of the second heat exchanger 102, the second channel of the second heat exchange component 120, the first channel of the first heat exchange component 110 and the first drying zone 201 in sequence, or the gas circulates along the first drying zone 201, the first channel of the second heat exchange component 120, the air channel of the second heat exchanger 102, the second channel of the second heat exchange component 120, the first channel of the first heat exchange component 110 and the first drying zone 201;

[0071] See also Fig.10The second external cold source 220 is connected in parallel with the second heat exchange component 120, and the gas in the first drying zone 201 is divided into two paths and flows to the second external cold source 220 and the first channel of the second heat exchanger 102 respectively, and converges to the air channel of the second heat exchanger 102, and then flows to the first drying zone 201 along the air channel of the second heat exchanger 102, the second channel of the second heat exchange component 120, and the first channel of the first heat exchange component 110.

[0072] like Figure 7 and Figure 8 As shown, in an optional embodiment, the heat pump drying device 100 also includes a second external cold source 220 and a second heat exchange component 120, the second heat exchange component 120 has a first channel and a second channel that can exchange heat with each other, and the second external cold source 220 and the second heat exchange component 120 are both located upstream of the air channel of the second heat exchanger 102.

[0073] When the second external cold source 220 is located upstream of the first channel of the second heat exchange component 120, the gas in the first drying zone 201 can circulate along the first drying zone 201, the second external cold source 220, the first channel of the second heat exchange component 120, the air channel of the second heat exchanger 102, the second channel of the second heat exchange component 120, the first channel of the first heat exchange component 110, and the first drying zone 201 in sequence;

[0074] When the second external cold source 220 is located downstream of the first channel of the second heat exchange component 120, the gas in the first drying zone 201 can circulate along the first drying zone 201, the first channel of the second heat exchange component 120, the second external cold source 220, the air channel of the second heat exchanger 102, the second channel of the second heat exchange component 120, the first channel of the first heat exchange component 110 and the first drying zone 201 in sequence.

[0075] It should be noted that the second heat exchange component 120 can increase the heat exchange amount, thereby achieving a changed dehumidification amount and efficiency. In this embodiment, the second external cold source 220 is located upstream or downstream of the first channel of the second heat exchange component 120, and heat exchange can be achieved in a variety of ways, and the air inlet and outlet temperatures on both sides of the second heat exchange component 120 and the second external cold source 220 are adjusted to better utilize low-grade energy, which can be operated more efficiently, and can also improve the problem of too small temperature difference of the heat exchanger in some cases, resulting in large wind side resistance and high energy consumption.

[0076] See also Fig.11In an optional embodiment, the heat pump drying device 100 also includes a third heat exchanger 105, the refrigerant channel of the third heat exchanger 105 is located between the first heat exchanger 101 and the second heat exchanger 102, and the air channel of the third heat exchanger 105 is located downstream of the first channel of the first heat exchange component 110, so that the gas circulates along the first drying zone 201, the air channel of the second heat exchanger 102, the first channel of the first heat exchange component 110, the air channel of the third heat exchanger 105 and the first drying zone 201.

[0077] It should be pointed out that the temperature of the refrigerant inside the third heat exchanger 105 is relatively high. On the one hand, it can increase the temperature of the air entering the first drying area 201, which is beneficial to the drying process or process requirements. On the other hand, it can also reduce the temperature of the refrigerant in the refrigerant channel through the air in the air channel, thereby increasing the subcooling of the compression refrigeration cycle and improving the cooling capacity and efficiency of the overall compression refrigeration cycle.

[0078] like Fig.12 As shown, the third heat exchanger 105 can be connected in parallel with the first heat exchanger 101, and can include at least one of the first external cold source 210, the second external cold source 220, the second heat exchange component 120, etc., and this embodiment of the present invention will not be described in detail.

[0079] See also Fig.13 In an optional embodiment, the heat pump drying device 100 also includes a third heat exchange component 130 and a first external cold source 210, and the second drying zone 202 has at least two groups of circulation passages, wherein the circulation path of the first group of circulation passages in the second drying zone 202 is: the second drying zone 202, the second channel of the first heat exchange component 110, the first channel of the third heat exchange component 130, the first air channel of the first heat exchanger 101 and the second drying zone 202; the circulation path of the second group of circulation passages in the second drying zone 202 is: the second drying zone 202, the second channel of the third heat exchange component 130, the first external cold source 210, the second air channel of the first heat exchanger 101 and the second drying zone 202; the first air channel and the second air channel of the first heat exchanger 101 can both exchange heat with the refrigerant channel of the first heat exchanger 101.

[0080] The function technology of the third heat exchange component 130 allows heat exchange between the two gases, increases the cooling capacity in the dehumidification stage and the heat in the heating stage, and achieves the purpose of improving the dehumidification capacity and efficiency. The two gases flow into the first heat exchanger 101, which can reduce the condensation temperature of the first heat exchanger 101 and increase the air supply temperature of one of the two gases, thereby reaching a high air supply temperature that meets certain drying process requirements, achieving a low condensation temperature, reducing the energy consumption of the compressor 103, and then improving efficiency.

[0081] In an optional embodiment, the second drying zone 202 also has a third group of circulation passages, and the circulation path of the third group of circulation passages of the second drying zone 202 is: the second drying zone 202, the third air channel of the first heat exchanger 101 and the second drying zone 202, wherein the third air channel of the first heat exchanger 101 can also exchange heat with the refrigerant channel of the first heat exchanger 101.

[0082] At this time, three streams of gas flow into the first heat exchanger 101, which can reduce the condensation temperature of the first heat exchanger 101 and increase the air supply temperature of one of the three streams of gas, thereby achieving a low condensation temperature under the condition of reaching a high air supply temperature that meets certain drying process requirements, reducing the energy consumption of the compressor 103, and thus improving efficiency. The heat recovery relationship can be further utilized to increase the heat exchange amount for dehumidification, and at the same time, it can better match the requirements of the drying process, and still achieve the purpose of reducing the condensation temperature, thereby achieving overall high efficiency.

[0083] It should be noted that the positions at which the two or three gases enter the second drying zone 202 may be different, that is, objects to be dried at different positions may be dried, thereby improving the drying effect.

[0084] See also Fig.14 In an optional embodiment, the heat pump drying device 100 further includes a fourth heat exchange component 140, and the first drying zone 201 has two groups of circulation passages; wherein the circulation path of the first group of circulation passages in the first drying zone 201 is: the first drying zone 201, the first channel of the second heat exchanger 102, the air channel of the first heat exchange component 110, and the first drying zone 201; the circulation path of the second group of circulation passages in the first drying zone 201 is: the first drying zone 201, the first channel of the fourth heat exchange component 140, and the first drying zone 201; the circulation path of the second group of circulation passages in the second drying zone 202 is: the second drying zone 202, the second channel of the fourth heat exchange component 140, the second channel of the third heat exchange component 130, the first external cold source 210, the second air channel of the first heat exchanger 101, and the second drying zone 202.

[0085] It should be pointed out that, in this embodiment, the fourth heat exchange component 140 can transfer the problem of thermal balance between the two air ducts, and can also provide heat and hot air for drying to the first drying area 201, and provide additional cooling capacity for dehumidification to the second drying area 202, thereby increasing the dehumidification capacity.

[0086] See also Fig.15In an optional embodiment, the heat pump drying device 100 also includes a fifth heat exchange component 150; the circulation path of the second group of circulation paths of the second drying zone 202 is: the second drying zone 202, the second channel of the fourth heat exchange component 140, the second channel of the third heat exchange component 130, the first external cold source 210, the first channel of the fifth heat exchange component 150, the second air channel of the first heat exchanger 101 and the second drying zone 202; the circulation path of the third group of circulation paths of the second drying zone 202 is: the second drying zone 202, the second channel of the fifth heat exchange component 150, the third air channel of the first heat exchanger 101 and the second drying zone 202.

[0087] It should be noted that, in this embodiment, the fifth heat exchange component 150 can first cool down the gas in the third air channel and then heat up the gas in the second air channel, thereby increasing the dehumidification amount of the gas in the third air channel and improving the overall dehumidification amount and efficiency.

[0088] See also Fig.16 In an optional embodiment, the heat pump drying device 100 further includes a first external cold source 210, a second heat exchange component 120 and a sixth heat exchange component 160, the sixth heat exchange component 160 having a first channel and a second channel that can exchange heat with each other; the first channel of the second heat exchange component 120 is located upstream of the air side of the second heat exchanger 102, the second channel of the second heat exchange component 120 is located downstream of the air side of the second heat exchanger 102, the first external cold source 210 is located upstream of the second channel of the first heat exchange component 110, and the first channel of the sixth heat exchange component 160 is located downstream of the first channel of the second heat exchange component 120, so that the gas is sequentially transferred along the first channel of the first heat exchange component 120. A drying zone 201, a first channel of a second heat exchange component 120, a first channel of a sixth heat exchange component 160, an air channel of a second heat exchanger 102, a second channel of a second heat exchange component 120, a first channel of a first heat exchange component 110 and a first drying zone 201 circulate; the second channel of the sixth heat exchange component 160 is located downstream of the second channel of the first heat exchange component 110, so that the gas circulates in sequence along the second drying zone 202, the first external cold source 210, the second channel of the first heat exchange component 110, the second channel of the sixth heat exchange component 160, the air channel of the first heat exchanger 101 and the second drying zone 202.

[0089] It should be pointed out that, in this embodiment, the sixth heat exchange component 160 can enable heat exchange between the gas in the circulating air duct of the first drying zone 201 and the circulating air duct of the second drying zone 202, which can increase the cooling capacity in the air dehumidification stage and the heat in the heating stage, thereby achieving the purpose of improving the dehumidification capacity and efficiency.

[0090] See also Fig.17In an optional embodiment, the heat pump drying device 100 further includes an eighth heat exchange component 180 and a first external cold source 210, so that the gas circulates along the second drying area 202, the first channel of the eighth heat exchange component 180, the second channel of the first heat exchange component 110, the second channel of the eighth heat exchange component 180, the first external cold source 210, the air channel of the first heat exchanger 101, and the second drying area 202. The arrangement of the eighth heat exchange component 180 can improve heat recovery and dehumidification.

[0091] See also Fig.18 In an optional embodiment, the heat pump drying device 100 further includes a branch compressor 106, a branch throttling device 107, a fourth heat exchanger 108 and a fifth heat exchanger 109, the exhaust port of the branch compressor 106 is connected to the first port of the third heat exchanger 105, the second port of the fourth heat exchanger 108 is connected to the first port of the branch throttling device 107, the second port of the branch throttling device 107 is connected to the first port of the fifth heat exchanger 109, the second port of the fifth heat exchanger 109 is connected to the branch compressor 106, and the exhaust port of the branch compressor 106 is connected to the first port of the third heat exchanger 105. The air circulation path of the first drying zone 201 is: the first drying zone 201, the air channel of the second heat exchanger 102, the first channel of the first heat exchange component 110, the air channel of the fourth heat exchanger 108, and the first drying zone 201; the gas circulation path of the second drying zone 202 is: the second drying zone 202, the second channel of the first heat exchange component 110, the air channel of the fifth heat exchanger 109, the air channel of the first heat exchanger 101, and the second drying zone 202.

[0092] It should be pointed out that in this embodiment, in the case of certain drying objects and drying processes, the heat transfer between the circulating air duct of the first drying zone 201 and the circulating air duct of the second drying zone 202 is limited by the heat transfer temperature difference of the heat exchanger, and it is necessary to balance the heat exchanger structure, wind resistance and other issues. By adding another compression refrigeration cycle to ensure the supply air temperature of the circulating air duct of the first drying zone 201 and the cooling capacity of the circulating air duct of the second drying zone 202 in the dehumidification stage, a comprehensive high energy efficiency is achieved.

[0093] In an optional embodiment, the heat pump drying device 100 also includes a second heat exchange component 120, the first channel of the second heat exchange component 120 is located upstream of the air side of the second heat exchanger 102, and the second channel of the second heat exchange component 120 is located downstream of the air side of the second heat exchanger 102, so that the gas in the first drying zone 201 circulates along the first drying zone 201, the first channel of the second heat exchange component 120, the air channel of the second heat exchanger 102, the second channel of the second heat exchange component 120, the first channel of the first heat exchange component 110, the air channel of the fourth heat exchanger 108 and the first drying zone 201 in sequence.

[0094] In addition, in the embodiment including the second compression refrigeration cycle, the heat pump drying device 100 may further include a first external cold source 210, a second external cold source 220, etc. Other components in the above embodiment may also be applied in the embodiment including the second compression refrigeration cycle.

[0095] In an embodiment of the present invention, the heat pump drying device 100 further includes a precooling heat exchanger and a spray device. The precooling heat exchanger is arranged between the first heat exchanger 101 and the first heat exchange assembly 110, and / or, between the second heat exchanger 102 and the first drying area 201; the precooling heat exchanger has a first channel and a second channel, the first channel of the precooling heat exchanger is used to circulate the gas in the drying area, the second channel of the precooling heat exchanger is used to circulate the outside air, and the spray device is used to cool the gas flowing into the second channel of the precooling heat exchanger. In this embodiment, the evaporation of water can be used to take away the heat, so as to achieve more efficient heat exchange, and also solve or improve the problem that the drying process in some drying processes is limited by the outside climate when the precooling heat exchanger exchanges heat with the outside air.

[0096] It should be noted that the pre-cooling heat exchanger may be at least one of the first external cold source 210 and the second external cold source 220 mentioned above.

[0097] Optionally, a filler or a wet film may be provided upstream of the second channel of the precooling heat exchanger, and the spraying device may spray the filler or the wet film to cool the gas. In this embodiment, the outside air is cooled by passing through the filler and the wet film sprayed with water on the surface, and then flows through the second channel of the precooling heat exchanger.

[0098] Furthermore, the heat pump drying device 100 also includes a water receiving pan and a drain pipe. The water receiving pan is arranged below the second heat exchanger 102 to receive condensed water. The drain pipe is connected to the water receiving pan and the spray device to drain the condensed water in the water receiving pan to the spray device.

[0099] It should be noted that the use of the condensed water of the second heat exchanger 102 for spraying does not require the installation of a water pump, and the water can be completely evaporated through design or flow adjustment.

[0100] The heat pump drying device 100 provided in the embodiment of the present invention provides cooling capacity through the second heat exchanger 102, so that the air flowing through its surface is cooled and dehumidified, and moisture is condensed. The air in the first channel of the first heat exchanger 101 component is heated and sent to the first drying area 201 domain, and the air in the second channel of the first heat exchanger 101 component is cooled and dehumidified, and moisture is condensed, and then it is heated again by the first heat exchanger 101 and sent to the second drying area 202 domain. Through the multi-stage heat exchange principle, the cooling capacity provided by the first heat exchanger 101 is used twice, and the dehumidification capacity is provided twice. Similarly, the heat provided by the second heat exchanger 102 is also used twice, so the overall effect is higher and more energy-saving. In addition, the first heat exchanger 101 and the second heat exchanger 102 can make more use of waste cooling, waste heat or other low-grade energy to make full use of energy.

[0101] The above are only preferred embodiments of the present invention and are 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 heat pump drying device, characterized in that: The invention comprises a first heat exchanger (101), a second heat exchanger (102), a first heat exchange assembly (110), a first drying area (201) and a second drying area (202), wherein the first heat exchanger (101) is used for exchanging heat with gas flowing through its surface, and the second heat exchanger (102) is used for exchanging heat with gas flowing through its surface; The first drying zone (201), the air channel of the second heat exchanger (102), and the first channel of the first heat exchange component (110) are connected in sequence through pipelines, so that the gas circulates along the first drying zone (201), the air channel of the second heat exchanger (102), the first channel of the first heat exchange component (110), and the first drying zone (201); The second drying zone (202), the second channel of the first heat exchange component (110), and the air channel of the first heat exchanger (101) are connected in sequence through pipelines, so that the gas circulates along the second drying zone (202), the second channel of the first heat exchange component (110), the air channel of the first heat exchanger (101), and the second drying zone (202); The heat pump drying device (100) further comprises a compressor (103) and a throttling device (104); the exhaust port of the compressor (103) is connected to the refrigerant channel of the first heat exchanger (101); the throttling device (104) is connected between the refrigerant channel of the first heat exchanger (101) and the refrigerant channel of the second heat exchanger (102); and the air intake port of the compressor (103) is connected to the refrigerant channel of the second heat exchanger (102); The heat pump drying device (100) further comprises a second external cold source (220), the second external cold source (220) being located upstream of the air channel of the second heat exchanger (102), so that the gas circulates along the first drying zone (201), the second external cold source (220), the air channel of the second heat exchanger (102), the first channel of the first heat exchange component (110), and the first drying zone (201) in sequence; The heat pump drying device (100) further comprises a second heat exchange component (120), wherein the second heat exchange component (120) comprises a first channel and a second channel capable of exchanging heat with each other; The second external cold source (220) is located upstream of the first channel of the second heat exchange component (120), and is provided with a channel directly connecting the first drying zone (201) and the first channel of the second heat exchange component (120), so that the air circulates along the first drying zone (201), the second external cold source (220), the first channel of the second heat exchange component (120), the air channel of the second heat exchanger (102), the second channel of the second heat exchange component (120), the first channel of the first heat exchange component (110) and the first drying zone (201) in sequence, or the gas circulates along the first drying zone (201), the first channel of the second heat exchange component (120), the air channel of the second heat exchanger (102), the second channel of the second heat exchange component (120), the first channel of the first heat exchange component (110) and the first drying zone (201); The heat pump drying device (100) further comprises a cavity (200) and a partition mechanism (203) arranged in the cavity (200), wherein the partition mechanism (203) divides the cavity (200) into the first drying area (201) and the second drying area (202), and the cavity (200) is provided with a feed port (2011) in the first drying area (201) and a discharge port (2021) in the second drying area (202).

2. The heat pump drying device according to claim 1, characterized in that: The heat pump drying device (100) further includes a first external cold source (210); The first external cold source (210) is located upstream or downstream of the second channel of the first heat exchange component (110), so that the gas in the second drying zone (202) circulates along the second drying zone (202), the first external cold source (210), the second channel of the first heat exchange component (110), the air channel of the first heat exchanger (101) and the second drying zone (202) in sequence, or the gas in the second drying zone (202) circulates along the second drying zone (202), the second channel of the first heat exchange component (110), the first external cold source (210), the air channel of the first heat exchanger (101) and the second drying zone (202) in sequence.

3. The heat pump drying device according to claim 1, characterized in that: The second external cold source (220) is connected in parallel with the second heat exchange component (120), and the gas in the first drying zone (201) is divided into two paths and flows to the second external cold source (220) and the first channel of the second heat exchanger (102) respectively, and then converges to the air channel of the second heat exchanger (102), and then flows along the air channel of the second heat exchanger (102), the second channel of the second heat exchange component (120), and the first channel of the first heat exchange component (110) to the first drying zone (201).

4. The heat pump drying device according to claim 1, characterized in that: The second external cold source (220) is located downstream of the first channel of the second heat exchange component (120), so that the gas circulates along the first drying zone (201), the first channel of the second heat exchange component (120), the second external cold source (220), the air channel of the second heat exchanger (102), the second channel of the second heat exchange component (120), the first channel of the first heat exchange component (110) and the first drying zone (201) in sequence.

5. The heat pump drying device according to claim 1, characterized in that: The heat pump drying device (100) also includes a third heat exchanger (105), the refrigerant channel of the third heat exchanger (105) is located between the first heat exchanger (101) and the second heat exchanger (102), and the air channel of the third heat exchanger (105) is located downstream of the first channel of the first heat exchange component (110), so that the gas circulates along the first drying zone (201), the air channel of the second heat exchanger (102), the first channel of the first heat exchange component (110), the air channel of the third heat exchanger (105) and the first drying zone (201).

6. The heat pump drying device according to claim 1, characterized in that: The heat pump drying device (100) further comprises a third heat exchange component (130) and a first external cold source (210); the first heat exchanger (101) comprises a first air channel and a second air channel, both of which exchange heat with the cold medium channel of the first heat exchanger (101); the second drying zone (202) comprises at least two groups of circulation passages, wherein the circulation paths of the first group of circulation passages of the second drying zone (202) are: the second drying zone (202), the second channel of the first heat exchange component (110), the first channel of the third heat exchange component (130), the first air channel of the first heat exchanger (101) and the second drying zone (202); the circulation paths of the second group of circulation passages of the second drying zone (202) are: the second drying zone (202), the second channel of the third heat exchange component (130), the first external cold source (210), the second air channel of the first heat exchanger (101) and the second drying zone (202).

7. The heat pump drying device according to claim 6, characterized in that: The second drying zone (202) also has a third group of circulation passages, and the first heat exchanger (101) also has a third air channel for exchanging heat with the refrigerant channel of the first heat exchanger (101). The circulation path of the third group of circulation passages of the second drying zone (202) is: the second drying zone (202), the third air channel of the first heat exchanger (101) and the second drying zone (202), wherein the third air channel of the first heat exchanger (101) exchanges heat with the refrigerant channel of the first heat exchanger (101).

8. The heat pump drying device according to claim 7, characterized in that: The heat pump drying device (100) further comprises a fourth heat exchange component (140), and the first drying zone (201) has two groups of circulation passages; wherein the circulation path of the first group of circulation passages of the first drying zone (201) is: the first drying zone (201), the first channel of the second heat exchanger (102), the air channel of the first heat exchange component (110), and the first drying zone (201); and the circulation path of the second group of circulation passages of the first drying zone (201) is: the first drying zone (201), the first channel of the fourth heat exchange component (140), and the first drying zone (201); The circulation path of the second group of circulation passages of the second drying zone (202) is: the second drying zone (202), the second channel of the fourth heat exchange component (140), the second channel of the third heat exchange component (130), the first external cold source (210), the second air channel of the first heat exchanger (101) and the second drying zone (202).

9. The heat pump drying device according to claim 8, characterized in that: The heat pump drying device (100) further includes a fifth heat exchange component (150); The circulation path of the second group of circulation passages of the second drying zone (202) is: the second drying zone (202), the second channel of the fourth heat exchange component (140), the second channel of the third heat exchange component (130), the first external cold source (210), the first channel of the fifth heat exchange component (150), the second air channel of the first heat exchanger (101), and the second drying zone (202); The circulation path of the third group of circulation passages of the second drying zone (202) is: the second drying zone (202), the second channel of the fifth heat exchange component (150), the third air channel of the first heat exchanger (101) and the second drying zone (202).

10. The heat pump drying device according to claim 1, characterized in that: The heat pump drying device (100) further comprises a first external cold source (210), a second heat exchange component (120), and a sixth heat exchange component (160), wherein the sixth heat exchange component (160) comprises a first channel and a second channel for mutually exchanging heat; The first channel of the second heat exchange component (120) is located upstream of the air side of the second heat exchanger (102), the second channel of the second heat exchange component (120) is located downstream of the air side of the second heat exchanger (102), the first external cold source (210) is located upstream of the second channel of the first heat exchange component (110), and the sixth heat exchange component (160) is located downstream of the first channel of the second heat exchange component (120), so that the gas circulates along the first drying zone (201), the first channel of the second heat exchange component (120), the first channel of the sixth heat exchange component (160), the air channel of the second heat exchanger (102), the second channel of the second heat exchange component (120), the first channel of the first heat exchange component (110), and the first drying zone (201) in sequence; The second channel of the sixth heat exchange component (160) is located downstream of the second channel of the first heat exchange component (110), so that the gas circulates along the second drying zone (202), the first external cold source (210), the second channel of the first heat exchange component (110), the second channel of the sixth heat exchange component (160), the air channel of the first heat exchanger (101) and the second drying zone (202) in sequence.

11. The heat pump drying device according to claim 1, characterized in that: The heat pump drying device (100) further comprises an eighth heat exchange component (180) and a first external cold source (210), so that the gas circulates along the second drying zone (202), the first channel of the eighth heat exchange component (180), the second channel of the first heat exchange component (110), the second channel of the eighth heat exchange component (180), the first external cold source (210), the air channel of the first heat exchanger (101) and the second drying zone (202).

12. The heat pump drying device according to claim 1, characterized in that: The heat pump drying device (100) further comprises a branch compressor (106), a branch throttling device (107), a fourth heat exchanger (108) and a fifth heat exchanger (109); the exhaust port of the branch compressor (106) is connected to the first port of the fourth heat exchanger (108); the second port of the fourth heat exchanger (108) is connected to the first port of the branch throttling device (107); the second port of the branch throttling device (107) is connected to the first port of the fifth heat exchanger (109); and the second port of the fifth heat exchanger (109) is connected to the air intake port of the branch compressor (106); The gas circulation path of the first drying zone (201) is: the first drying zone (201), the air channel of the second heat exchanger (102), the first channel of the first heat exchange component (110), the air channel of the fourth heat exchanger (108), and the first drying zone (201); The gas circulation path of the second drying zone (202) is: the second drying zone (202), the second channel of the first heat exchange component (110), the air channel of the fifth heat exchanger (109), the air channel of the first heat exchanger (101), and the second drying zone (202).

13. The heat pump drying device according to claim 12, characterized in that: The heat pump drying device (100) further comprises a second heat exchange component (120), wherein a first channel of the second heat exchange component (120) is located upstream of the air side of the second heat exchanger (102), and a second channel of the second heat exchange component (120) is located downstream of the air side of the second heat exchanger (102), so that the gas in the first drying zone (201) circulates in sequence along the first drying zone (201), the first channel of the second heat exchange component (120), the air channel of the second heat exchanger (102), the second channel of the second heat exchange component (120), the first channel of the first heat exchange component (110), the air channel of the fourth heat exchanger (108), and the first drying zone (201).

14. The heat pump drying device according to claim 1, characterized in that: The heat pump drying device (100) further comprises a transmission mechanism, one end of which is located in the first drying zone (201) and close to the feed port (2011), and the other end of which is located in the second drying zone (202) and close to the discharge port (2021); Alternatively, the heat pump drying device (100) further comprises a first conveying mechanism (204) and a second conveying mechanism (205), wherein the first conveying mechanism (204) is connected to the feed port (2011), and the second conveying mechanism (205) is connected to the discharge port (2021), the first conveying mechanism (204) and the second conveying mechanism (205) are connected or integrally arranged, or the first conveying mechanism (204) and the second conveying mechanism (205) are spaced apart from each other.

15. The heat pump drying device according to claim 1, characterized in that: The heat pump drying device (100) further comprises a precooling heat exchanger and a spraying device, wherein the precooling heat exchanger is arranged between the first heat exchanger (101) and the first heat exchange component (110), and / or between the second heat exchanger (102) and the first drying area (201); The precooling heat exchanger has a first channel and a second channel. The first channel of the precooling heat exchanger is used to circulate the gas in the drying area, and the second channel of the precooling heat exchanger is used to circulate the outside air. The spray device is used to cool the gas flowing into the second channel of the precooling heat exchanger.

16. The heat pump drying device according to claim 15, characterized in that: A filler or a wet film is arranged upstream of the second channel of the precooling heat exchanger, and the spraying device can spray the filler or the wet film.

17. The heat pump drying device according to claim 15, characterized in that: The heat pump drying device (100) further comprises a water receiving pan and a drain pipe, wherein the water receiving pan is arranged below the second heat exchanger (102) and is used to receive condensed water, and the drain pipe is connected to the water receiving pan and the spray device and is used to drain the condensed water in the water receiving pan to the spray device.

Images