A heat pump drying device

Abstract

The utility model discloses a kind of heat pump drying device, including drying cabinet, drying cabinet has drying cavity, drying cavity has first air inlet, first air outlet, flow guide port and moisture discharge port, flow guide port is equipped with door body, door body is movably connected with drying cabinet, to open or cover flow guide port;Moisture discharge port is communicated with outside;Heat pump unit, heat pump unit includes body and heat pump assembly, body has heat exchange cavity, heat exchange cavity has second air inlet and second air outlet, second air inlet is communicated with first air outlet by first air pipe, second air outlet is communicated with first air inlet by second air pipe;Heat pump assembly is installed in heat exchange cavity;Temperature detector, temperature detector is used to detect temperature, and sends temperature signal.The device detects ambient temperature in real time by temperature detector, switches heating mode, improves drying effect, energy saving and environmental protection, and is widely applicable.

Description

Technical Field

[0001] This utility model relates to the field of drying devices, and more particularly to a heat pump drying device. Background Technology

[0002] In the field of material drying, such as drying equipment for walnuts, ginseng, or tobacco, the choice of heating structure directly affects drying efficiency and quality. Currently, circulating heating drying structures and direct heating and direct exhaust drying structures are the mainstream technical solutions, each with its own advantages and disadvantages and significantly different application scenarios.

[0003] Circulating heating drying structures, due to their stable operation in low-temperature environments, are often integrated into heat pump drying systems with ambient temperatures below 15°C, achieving efficient heat utilization through hot air circulation. Direct heating and direct exhaust drying structures, on the other hand, are characterized by rapid dehumidification and ensuring material quality. However, they are less suitable for low-temperature environments (such as ambient temperatures <15°C), and their energy efficiency and environmental friendliness are weaker than heat pump systems when relying on hot air furnaces, resulting in larger system equipment configurations and higher costs.

[0004] Therefore, compared to hot air furnace drying systems that rely on fuel combustion, heat pump drying systems have gradually become the preferred choice in the drying industry due to their significant energy-saving advantages and zero-pollutant emission environmental characteristics. However, to adapt to seasonal temperature changes, especially in conditions where the ambient temperature is below 15℃, heat pump drying rooms must adopt a circulating heating drying structure. This leads to difficulties in controlling humidity within the drying room, resulting in quality defects such as poor color and uneven moisture content after drying. It is difficult to achieve the drying effect of direct heating and direct exhaust structures, which also limits its application range. Utility Model Content

[0005] In order to overcome at least one of the defects of the prior art, the present invention provides a heat pump drying device, which can switch between circulating heating and direct exhaust mode by opening and closing the door of the guide port, thereby effectively improving the drying effect.

[0006] The technical solution adopted by this utility model to solve its problem is:

[0007] A heat pump drying device, comprising:

[0008] The drying chamber has a drying cavity, which has a first air inlet, a first air outlet, a guide port, and a dehumidification port. A door is provided at the guide port, which is movably connected to the drying chamber to open or close the guide port. The dehumidification port is connected to the outside.

[0009] A heat pump unit includes a body and a heat pump assembly. The body has a heat exchange chamber, which has a second air inlet and a second air outlet. The second air inlet is connected to the first air outlet through a first air duct, and the second air outlet is connected to the first air inlet through a second air duct. The heat pump assembly is installed inside the heat exchange chamber.

[0010] A temperature detector, which is used to detect temperature and send a temperature signal.

[0011] Furthermore, the heat pump drying device includes a drive unit, the door is slidably connected to the drying chamber, and the drive unit is used to drive the door to slide.

[0012] Furthermore, the heat pump drying device also includes a dehumidification fan, which is connected to the dehumidification port.

[0013] Furthermore, the drying chamber is also provided with a material tray, and the material tray has multiple through holes, which are distributed at intervals along the end face of the material tray.

[0014] Furthermore, a discharge port is provided at the bottom of the drying chamber, and the discharge port is connected to the drying chamber; the material tray is inclined from top to bottom along the height direction of the drying chamber and extends to the discharge port.

[0015] Furthermore, one end of the material tray extends through the discharge port into the drying chamber, and a baffle is provided at the end of the material tray extending into the drying chamber. The baffle includes a first plate segment and a second plate segment. The first plate segment is vertically connected to the material tray, and the second plate segment is set at an angle to the first plate segment.

[0016] Furthermore, a guide fan is provided at the second air outlet, and the guide fan is connected to the second air duct.

[0017] Furthermore, the heat exchange chamber is also provided with a third air outlet, and an air exchange valve is provided at the third air outlet, which is used to open or close the third air outlet.

[0018] Furthermore, the drying chamber includes multiple mounting plates, which enclose the drying cavity; the drying cavity is provided with a heat insulation layer, which extends along the cavity wall of the drying cavity.

[0019] Furthermore, the heat pump unit includes an evaporator, a condenser, and a compressor, with one end of the evaporator connected to one end of the compressor, and the other end of the compressor connected to the condenser.

[0020] In summary, the heat pump drying device provided by this utility model has the following technical effects:

[0021] The device uses a temperature detector to monitor the ambient temperature in real time and release a temperature signal. Users can open the door when the ambient temperature is high, opening the air vents to create a direct exhaust channel for rapid dehumidification. At the same time, the external hot airflow mixes with the airflow inside the drying chamber and flows back into the heat exchange chamber. The external hot airflow supplements and improves the heat exchange efficiency, achieving both rapid dehumidification and energy saving under high-temperature conditions.

[0022] When the ambient temperature is detected to be too low, the door will cover the flow port, and the heat pump component will adopt a low-temperature circulating heating mode to achieve recycling. At the same time, the moisture released by the material when heated will be discharged through the dehumidification port to reduce the risk of the material getting damp.

[0023] Furthermore, by responding to changes in ambient temperature in real time, the device can switch heating modes by opening or closing the flow inlet, which not only saves energy and protects the environment but also improves drying quality, thereby expanding the application range of the entire device. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of one possible structural mode of this utility model;

[0026] Figure 2 This is a schematic diagram of another structural mode of the present utility model;

[0027] The meanings of the reference numerals in the attached figures are as follows:

[0028] 10. Drying chamber; 11. Drying cavity; 111. First air inlet; 112. First air outlet; 113. Guide air outlet; 114. Exhaust outlet; 115. Material outlet; 20. Door; 30. Heat pump unit; 31. Machine body; 311. Heat exchange chamber; 312. Second air inlet; 313. Second air outlet; 314. Guide air fan; 315. Third air outlet; 316. Ventilation valve; 40. Exhaust fan; 50. Material tray; 51. Baffle; 511. First plate segment; 512. Second plate segment; 60. First air duct; 61. Second air duct. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0031] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0032] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0033] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0034] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0035] See Figure 1 and Figure 2This utility model discloses a heat pump drying device, including: a drying chamber 10, a heat pump unit 30, and a temperature detector. The drying chamber 10 has a drying cavity 11, which has a first air inlet 111, a first air outlet 112, a guide port 113, and a dehumidification port 114. The dehumidification port 114 is connected to the external environment, and a door 20 is provided at the guide port 113. The door 20 is movably connected to the drying chamber 10 to open or close the guide port 113. The heat pump unit 30 includes a body 31 and a heat pump assembly. The body 31 has a heat exchange cavity 311, which has a second air inlet 312 and a second air outlet 313. The second air inlet 312 is connected to the first air outlet 112 through a first air duct 60, and the second air outlet 313 is connected to the first air inlet 111 through a second air duct 61. The heat pump assembly is installed in the heat exchange cavity 311. Temperature detectors are used to detect temperature and send temperature signals.

[0036] During use, when the temperature detector detects that the ambient temperature is lower than the preset value, it can issue an audible alarm or color warning to remind the user. The user can manually close the door 20 or drive the door 20 to close via a drive mechanism (such as a motor) to cover the air guide port 113, allowing the heat pump assembly to adopt a low-temperature circulating heating mode. In this mode, during the heating process, the heat pump unit 30 heats the air in the heat exchange chamber 311 to the target temperature. The heated airflow is then sent to the second air duct 61 through the second air outlet 313 and introduced into the drying chamber 11 through the first air inlet 111 to heat the material in the drying chamber 11. Subsequently, the heated airflow is discharged through the first air outlet 112 and flows back into the heat exchange chamber 311 through the first air duct 60, realizing heat recycling. At the same time, the moisture released by the material during heating is discharged through the dehumidification port 114, reducing the risk of the material becoming damp and improving the drying quality.

[0037] When the temperature detector detects that the ambient temperature is higher than the preset value, the user can manually open the door 20 or open the door 20 through the drive mechanism, so that the guide port 113 is open to form a straight exhaust channel. In this working mode, the hot air in the heat exchange chamber 311 is sent into the drying chamber 11 through the second air duct 61. After the hot air completes the material drying task, the air carrying moisture can be quickly discharged to the external environment through the guide port 113, which promotes the rapid drying of the material in the drying chamber 11 while preventing it from getting damp, thus improving the drying quality.

[0038] Furthermore, when the guide port 113 is open, due to the relatively high external atmospheric pressure, the external hot air is "forced" into the drying chamber 11 under the action of the pressure difference. Since the first air outlet 112 is connected to the second air inlet 312 of the heat exchange chamber 311, and the heat pump unit 30 is continuously operating (the fan is working or the heat pump circulation generates suction), the air pressure at the first air outlet 112 is reduced. When the moisture in the drying chamber 11 is discharged from the guide port 113, in order to fill the airflow gap, the air in the drying chamber 11 naturally flows to the guide port 113, which further reduces the air pressure in the area near the first air outlet 112, forming a local low-pressure area. At this time, the external hot air and the residual hot air in the drying chamber 11 are "drawn" into the first air outlet 112 due to the pressure difference, and mix through the first air duct 60, and then flow back to the heat exchange chamber 311 in a directional manner. This process not only effectively recovers and utilizes waste heat, but also supplements heat energy through hot air from the outside. While rapidly dehumidifying, it also improves heat exchange efficiency, achieving energy-saving operation under high-temperature conditions.

[0039] The device monitors the ambient temperature through a temperature detector and, in conjunction with the movable door on the drying chamber, opens or closes the guide port 113 to switch the heating mode of the heat pump unit 30.

[0040] It should be noted that the heat pump unit 30 in this embodiment uses an existing heat pump structure, such as an evaporator, condenser, and compressor. After the heat pump unit 30 starts, the compressor compresses the low-temperature, low-pressure refrigerant into a high-temperature, high-pressure gaseous state. The gaseous gas is then liquefied by the condenser, releasing a large amount of heat to heat the air in the heat exchange chamber 311. Subsequently, the air is sent to the drying chamber 11 through the second air duct 61 for drying. Afterward, the hot air in the drying chamber 11 flows back to the heat exchange chamber 311 through the first air duct 60, where the evaporator absorbs heat to dehumidify and cool the air. The refrigerant then evaporates again and returns to the compressor, forming a highly efficient heat cycle.

[0041] Furthermore, in this embodiment, the temperature detector can be an existing thermocouple sensor, resistance temperature detector, or infrared temperature sensor, etc., and is installed on the outer peripheral wall of the drying chamber 10 away from the drying cavity 11 to monitor the ambient temperature in real time. The specific preset temperature value can be set to 15°C.

[0042] More specifically, during installation, the door 20 can be rotatably connected to the drying chamber 10 via hinges, pivots, or other connecting components, allowing the guide port 113 to open or close during rotation. Alternatively, when the door 20 is connected to the drying chamber 10 via a pivot or hinge, a drive mechanism (such as a servo motor or stepper motor) can be installed at the pivot or hinge to drive the pivot or hinge to rotate, thus achieving automatic opening and closing of the door 20.

[0043] Alternatively, linear guide rails (such as ball bearing guide rails or roller guide rails) can be installed on the drying chamber 10, and sliders can be fixed to the bottom or side of the door 20. The sliders are inserted into the guide rail grooves and slid, so that the door 20 is slidably connected to the drying chamber 10, and the guide port 113 is opened or closed during the sliding process. Similarly, a cylinder can be used to drive the piston rod of the cylinder to push the door 20 to slide, so as to realize automatic opening and closing; or an electric push rod can be connected to the door 20. The electric push rod has a built-in motor, lead screw and transmission mechanism. The rotation of the motor is converted into linear thrust through the lead screw, which pushes the door 20 to slide along the guide rail, so as to realize the bidirectional movement of the door 20.

[0044] Preferably, in this embodiment, the drive door 20 is slidably connected to the drying chamber 10 and is equipped with a drive component. The drive component drives the door 20 to slide, so as to realize the automatic opening or closing of the guide port 113 of the door 20, which is more automated.

[0045] Furthermore, the heat pump drying device also includes an exhaust fan 40, which is connected to the exhaust port 114. When the exhaust fan 40 is started, it generates air pressure, forcibly expelling the hot and humid air from the drying chamber 11. Compared to natural convection dehumidification, this significantly increases the rate of moisture removal. Especially in the initial stage of drying when the material has a high moisture content and produces a large amount of moisture, the exhaust fan 40 can quickly reduce the humidity inside the chamber, minimizing problems such as mold growth and discoloration caused by moisture retention, thereby improving the drying quality.

[0046] Specifically, the dehumidification fan 40 can be an existing centrifugal fan or axial fan. When the heat pump drying device is in low-temperature circulating heating mode, the internal moisture is difficult to dissipate. By starting the dehumidification fan 40, the moisture in the drying chamber 11 is quickly discharged, reducing the risk of the material inside the drying chamber 11 becoming damp.

[0047] Furthermore, the drying chamber 11 is also provided with a material tray 50, which has multiple through holes that are spaced apart along the end face of the material tray 50.

[0048] During installation, the material tray 50 is fixedly connected to the cavity wall of the drying chamber 11 using screws and other connectors, and is suspended inside the drying chamber 11. The material tray 50 supports the material, allowing hot air to penetrate the material layer during the drying process due to the multiple through holes in the tray 50. This creates bidirectional convection (rather than simply passing over the material surface), increasing the contact area between the hot air and the material. For example, when drying walnuts, hot air can directly act on the bottom surface of the material through the through holes, accelerating the evaporation of moisture from the bottom surface and effectively improving drying efficiency compared to a solid tray.

[0049] It should be noted that the material pallet 50 can be made of metal mesh, perforated plate or grid pallet.

[0050] In addition, a discharge port 115 is provided at the bottom of the drying chamber 10. The discharge port 115 is connected to the drying chamber 11. During assembly, the material tray 50 is tilted from top to bottom along the height direction of the drying chamber 11 and extends to the discharge port 115. By tilting the material tray 50, the material can slide along the surface of the material tray 50 to the discharge port 115 by its own weight after drying, without manual intervention or additional power devices, thus simplifying the discharge process.

[0051] Furthermore, during installation, one end of the material tray 50 extends through the discharge port 115 into the drying chamber 11, and a baffle 51 is provided at the end of the material tray 50 that extends into the drying chamber 11. The baffle 51 includes a first plate segment 511 and a second plate segment 512. The first plate segment 511 is vertically connected to the material tray 50, and the second plate segment 512 is set at an angle to the first plate segment 511.

[0052] Since the material tray 50 is tilted, the material is prone to slide quickly to the end due to gravity. Therefore, in this embodiment, a baffle 51 is provided at the end of the material tray 50 that extends out of the drying chamber 11. The first plate section 511 of the baffle 51 (perpendicular to the material tray 50) can directly prevent the material from rushing out of the material tray 50, reducing the occurrence of the material falling outside the equipment.

[0053] Meanwhile, since the second plate segment 512 of the baffle 51 is set at an angle to the first plate segment 511 (such as tilting towards the side of the drying chamber 10), when the material slides to the end of the material tray 50, the second plate segment 512 (tilted towards the drying chamber 11) will "push" the material back to the surface of the material tray 50, reducing the waste of material caused by the material directly rushing out of the discharge port 115 and falling to the ground.

[0054] In addition, when the second plate segment 512 is tilted towards the inside of the drying chamber 11, it can change the flow direction of the hot airflow at the end of the material tray 50, so that the hot airflow flows upward or back into the chamber along the surface of the baffle 51, reducing the risk of the airflow forming a "short circuit" (i.e., hot air is directly discharged from the discharge port 115) near the discharge port 115, reducing the probability of heat being directly lost to the outside, reducing heat loss, and making the temperature field inside the drying chamber 11 more uniform and stable.

[0055] Furthermore, a guide fan 314 is provided at the second air outlet 313, and the guide fan 314 is connected to the second air duct 61.

[0056] Specifically, when the guide fan 314 is started, it can provide air pressure to drive the hot airflow heated by the heat pump component in the heat exchange chamber 311 to flow rapidly into the second air duct 61, and then be directionally delivered to the drying chamber 11 at a higher flow rate. Compared with the natural convection mode without the guide fan 314, this can effectively improve the heat transfer efficiency, making it easier for the temperature in the drying chamber 11 to reach the target value in a short time, and effectively shortening the preheating time.

[0057] Similarly, the guide fan 314 can also be selected from existing centrifugal fans or axial fans, etc.

[0058] Furthermore, the heat exchange chamber 311 is also provided with a third air outlet 315, and an air exchange valve 316 is provided at the third air outlet 315. The air exchange valve 316 is used to open or close the third air outlet 315.

[0059] Specifically, when there is sufficient heat in the drying chamber 11, the ventilation valve 316 can be opened and the dehumidification fan 40 can be used to accelerate the discharge of hot and humid air from the drying chamber 11 and introduce outside air to reduce humidity and reduce the probability of materials becoming damp due to high humidity. By opening the ventilation valve 316 at regular intervals, the risk of material mold growth can be reduced and the drying quality can be improved. When there is insufficient heat, the frequency of opening the ventilation valve 316 can be reduced to reduce heat loss while dehumidifying.

[0060] For example, when operating in a low-temperature environment (such as winter), the heating capacity of the heat pump unit 30 decreases due to the low ambient temperature. If the ventilation valve 316 is frequently opened to introduce fresh air or the dehumidifier fan 40 is started to expel hot and humid air, a significant amount of heat will be lost from the heat exchange chamber 311. Therefore, when operating in a low-temperature environment, the ventilation valve 316 can be closed to block the third air outlet 315, preventing the hot airflow in the heat exchange chamber 311 from escaping through this channel. This forces the hot airflow to circulate between the drying chamber 11 and the heat exchange chamber 311, reducing heat loss to the outside. Simultaneously, by reducing the operating time of the dehumidifier fan 40, the probability of heat being expelled along with moisture due to dehumidification is reduced, thus retaining limited heat within the system and maintaining a stable temperature within the drying chamber 11.

[0061] If the heat pump unit 30 is insufficient but the material still needs to be dehumidified, the ventilation valve 316 can be opened intermittently to shorten the dehumidification time. This ensures that a small amount of moisture is discharged while minimizing heat loss. This reduces the risk of moisture accumulation affecting material drying and also reduces the probability of decreased drying efficiency due to excessive heat loss.

[0062] When the heat pump unit 30 is operating at high temperatures (such as during the later stages of drying when high temperatures are needed to accelerate moisture evaporation), both the ventilation valve 316 and the exhaust fan 40 can be closed. At this time, the first air outlet 112 of the drying chamber 11 creates a negative pressure environment due to the operation of the guide fan 314. Under the action of negative pressure, the air in the drying chamber 11 after heat exchange (still containing some residual heat) and a small amount of hot air entering from the guide port 113 will be drawn together into the second air inlet 312 of the heat exchange chamber 311. This mixed air is reheated in the heat pump unit 30 and then sent back into the heat exchange chamber 311 and the drying chamber 11, forming a "waste heat recovery - secondary heating" cycle, reducing the risk of heat waste caused by the direct emission of high-temperature hot air.

[0063] Preferably, the ventilation valve 316 in this embodiment is an existing fresh air valve, such as an electric fresh air valve or a pneumatic fresh air valve.

[0064] Furthermore, the drying chamber 10 includes multiple mounting plates, which enclose a drying cavity 11; the drying cavity 11 is provided with a heat insulation layer, which extends along the cavity wall of the drying cavity 11.

[0065] Specifically, the insulation layer extends along the cavity wall of the drying chamber 11 to cover the entire cavity wall of the drying chamber 11. The insulation layer blocks the heat in the drying chamber 11 from being conducted to the external environment, reduces the risk of external cold air infiltration, reduces the probability of heat loss in the drying chamber 11, improves the internal drying effect, and indirectly reduces the heat loss of the heat pump unit 30.

[0066] It should be noted that the insulation layer can be made of insulation materials such as rock wool and glass wool, and it can be connected to the cavity wall of the drying chamber 11 by adhesive bonding, or the cavity wall of the drying chamber 11 can be sprayed with insulation materials such as polyurethane foam.

[0067] Furthermore, the heat pump unit 30 in this embodiment includes an evaporator, a condenser, and a compressor. One end of the evaporator is connected to one end of the compressor, and the other end of the compressor is connected to the condenser. When the heat pump unit 30 starts, the compressor compresses the low-temperature, low-pressure refrigerant into a high-temperature, high-pressure gaseous state. The gaseous gas is then liquefied in the condenser, releasing a large amount of heat to heat the air in the heat exchange chamber 311. Subsequently, the air is sent to the drying chamber 11 through the second air duct 61 for drying. Afterward, the hot airflow in the drying chamber 11 flows back to the heat exchange chamber 311 through the first air duct 60, where the evaporator absorbs heat to dehumidify and cool the air. The refrigerant then evaporates again and returns to the compressor, forming a highly efficient heat cycle.

[0068] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A heat pump drying apparatus, characterized by, The heat pump drying device comprises a drying box body, a heat pump unit, and a temperature detector. The drying box body has a drying cavity with a first air inlet, a first air outlet, a guide opening, and a moisture outlet. The heat pump unit comprises a machine body and a heat pump assembly. The temperature detector is used for detecting temperature and sending a temperature signal.

2. The heat pump drying apparatus as claimed in claim 1, wherein The door body is slidingly connected to the drying box body, and the driving member is used to drive the door body to slide.

3. The heat pump drying apparatus as claimed in claim 1, wherein The heat pump drying device further comprises a moisture exhaust fan.

4. The heat pump drying apparatus as claimed in claim 1, wherein The drying cavity is further provided with a material supporting plate having a plurality of through holes.

5. The heat pump drying apparatus as claimed in claim 4, wherein The drying box body is further provided with a discharge port.

6. The heat pump drying apparatus as claimed in claim 5, wherein The material supporting plate is inclined from top to bottom along the height direction of the drying cavity and extends to the discharge port.

7. The heat pump drying apparatus as claimed in claim 1, wherein One end of the material supporting plate extends out of the drying cavity through the discharge port.

8. The heat pump drying apparatus as claimed in claim 1, wherein The second air outlet is provided with a guide fan.

9. Heat pump drying apparatus as claimed in any of the claims 1-8, characterized in that, The heat exchange cavity is further provided with a third air outlet provided with an air exchange valve.

10. Heat pump drying apparatus as claimed in any of the claims 1-8, characterized in that, The drying box body comprises a plurality of mounting plates forming the drying cavity. The heat pump unit comprises an evaporator, a condenser, and a compressor. One end of the evaporator is in communication with one end of the compressor, and the other end of the compressor is in communication with the condenser.

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