Integrated internal and external circulation heat pump drying device and its intelligent control system

Abstract

This invention discloses an integrated internal and external circulation heat pump drying device and its intelligent control system. The device includes a condenser, an evaporator, a compressor, a throttling valve, a first to a fourth airflow regulator, and a blower. During operation, the intelligent control system compares the return air temperature and humidity of the working space with the outdoor temperature and humidity and the target temperature and humidity, and switches the operating mode of the entire device by controlling each actuator. This invention can utilize outdoor air energy and recover exhaust energy from the working space while achieving the target temperature and humidity, thus improving overall energy utilization efficiency.

Description

Technical Field

[0001] This invention relates to heat pump technology, specifically to an integrated internal and external circulation heat pump drying device and its intelligent control system. Background Technology

[0002] After harvesting, a large number of crops need to be dried to extend their shelf life. The drying process consumes heat energy. Most of the time, the drying process requires controlling the ambient temperature to gradually increase and the ambient humidity to gradually decrease. Heat pump technology is widely used in crop drying.

[0003] Currently, there are two common types of heat pump drying devices for drying crops on the market: internal circulation and external circulation. External circulation heat pump drying devices consume more energy when the outdoor ambient temperature is low and have insufficient heating capacity. Internal circulation heat pump drying devices recover the humid heat of the exhaust gas in the drying chamber as a heat source, heat it up by the heat pump, and then send it into the indoor circulation. They consume more energy in the early stage of drying and have lower heat pump efficiency in the later stage when the humidity in the drying chamber decreases. Summary of the Invention

[0004] To address the problems existing in current internal and external circulation heat pump drying devices, one objective of this invention is to provide an integrated internal and external circulation heat pump drying device, providing a hardware foundation for utilizing outdoor air energy and recovering exhaust energy from the workspace. Another objective is to provide an intelligent control system for the aforementioned integrated internal and external circulation heat pump drying device, which utilizes outdoor air energy and recovers exhaust energy from the workspace while achieving the target temperature and humidity, thereby improving the overall energy utilization efficiency.

[0005] The technical solution adopted in this invention is:

[0006] This application provides an integrated internal and external circulation heat pump drying device, including a condenser, an evaporator, a compressor, a throttling valve, a first to a fourth airflow regulator, and a blower; the condenser includes heat exchange coils and a first air passage and a second air passage, the two ends of the second air passage being connected to the outside and its inlet end equipped with a heat exchange fan; the evaporator includes heat exchange coils and a first air passage and a second air passage, the inlet end of the first air passage being equipped with a first heat exchange fan, the two ends of the second air passage being connected to the outside and its inlet end equipped with a second heat exchange fan; the heat exchange coils of the condenser and evaporator form a loop through refrigerant piping. The circuit is equipped with a compressor and a throttle valve; the first to fourth air volume regulators each include an air box, and the air box is equipped with multiple air interfaces with regulating valves; the first air volume regulator, the first air passage of the condenser, the second air volume regulator, the blower, the working space, the third air volume regulator, the first air passage of the evaporator, and the fourth air volume regulator are connected in sequence through air ducts to form a circuit. The first and second air volume regulators, as well as the third and fourth air volume regulators, are also directly connected through air ducts. The first and fourth air volume regulators each have an air interface that connects to the outside.

[0007] This application also provides an intelligent control system for the aforementioned integrated internal and external circulation heat pump drying device, including a return air temperature and humidity acquisition module for collecting the return air temperature and humidity of the working space, an outdoor temperature and humidity acquisition module for collecting the outdoor temperature and humidity, and an intelligent controller; the intelligent controller is electrically connected to the return air temperature and humidity acquisition module, the outdoor temperature and humidity acquisition module, and each actuator of the integrated internal and external circulation heat pump drying device; during operation, the intelligent controller compares the return air temperature and humidity of the working space with the outdoor temperature and humidity and the target temperature and humidity, and switches the operating mode of the entire device by controlling each actuator, thereby utilizing outdoor air energy and recovering exhaust energy from the working space while achieving the target temperature and humidity.

[0008] Furthermore, the operating modes include external circulation ventilation mode, external circulation heating mode, external circulation heat recovery heating mode, internal circulation ventilation mode, internal circulation heating mode, internal circulation dehumidification heating mode, and internal circulation dehumidification cooling mode.

[0009] Furthermore, if the return air temperature and humidity in the workspace are both lower than the target temperature and humidity and lower than the outdoor temperature and humidity, and the enthalpy of the return air in the workspace is lower than the enthalpy of the outdoor air, then the external circulation ventilation mode is activated: the outdoor air passes through the first air volume regulator, the second air volume regulator, the supply fan, the workspace, the third air volume regulator, and the fourth air volume regulator in sequence before being discharged to the outside.

[0010] Furthermore, if the return air temperature and humidity in the workspace are both lower than the target temperature and humidity and lower than the outdoor temperature and humidity, and the enthalpy of the return air in the workspace is greater than the enthalpy of the outdoor air, then the internal circulation heating mode is activated: the compressor operates, and the air sequentially passes through the first air volume regulator, the first air passage of the condenser, the second air volume regulator, the blower, the workspace, the third air volume regulator, and the fourth air volume regulator to achieve internal circulation.

[0011] Furthermore, if the return air temperature in the working space is lower than the target temperature, the return air temperature and humidity in the working space are both lower than the outdoor temperature and humidity, and the enthalpy of the return air in the working space is lower than the enthalpy of the outdoor air, then the external circulation heating mode is activated: the second heat exchange fan and compressor of the evaporator operate, and the outdoor air passes through the first air volume regulator, the first air passage of the condenser, the second air volume regulator, the blower, the working space, the third air volume regulator and the fourth air volume regulator before being discharged to the outside.

[0012] Furthermore, if the return air temperature in the working space is lower than the target temperature, the return air humidity in the working space is higher than the target humidity, and both the return air temperature and humidity in the working space are lower than the outdoor temperature and humidity, and the enthalpy of the return air in the working space is higher than the enthalpy of the outdoor air, then the external circulation heat recovery heating mode is activated: the first heat exchange fan and compressor of the evaporator are working, and the outdoor air passes through the first air volume regulator, the first air passage of the condenser, the second air volume regulator, the blower, the working space, the third air volume regulator, the first air passage of the evaporator, and the fourth air volume regulator in sequence before being discharged to the outside.

[0013] Furthermore, if the return air temperature in the working space is lower than the target temperature, the return air humidity in the working space is higher than the target humidity, the return air temperature in the working space is lower than the outdoor temperature, and the return air humidity in the working space is higher than the outdoor humidity, then the internal circulation dehumidification and heating mode is activated: the first heat exchange fan and compressor of the evaporator work, and the air passes through the first air volume regulator, the first air passage of the condenser, the second air volume regulator, the blower, the working space, the third air volume regulator, the first air passage of the evaporator, and the fourth air volume regulator in sequence to achieve internal circulation.

[0014] Furthermore, if the return air temperature in the workspace is greater than the target temperature and the return air humidity in the workspace is less than the target humidity, then the internal circulation ventilation mode is activated: the air passes through the second air volume regulator, the supply fan, the workspace, and the third air volume regulator in sequence to achieve internal circulation.

[0015] Furthermore, if the return air temperature and humidity in the workspace are both greater than the target temperature and humidity, the internal circulation dehumidification and cooling mode will be activated: the heat exchange fan of the condenser, the first heat exchange fan of the evaporator, and the compressor will work, and the air will sequentially pass through the first air volume regulator, the second air volume regulator, the blower, the workspace, the third air volume regulator, the first air passage of the evaporator, and the fourth air volume regulator to achieve internal circulation.

[0016] The beneficial effects of this invention are:

[0017] The device adopts a structure that combines internal and external circulation, avoiding the shortcomings of simply using internal or external circulation. It provides a hardware foundation for utilizing outdoor air energy and recovering exhaust energy from the workspace, making it suitable for occasions such as drying rooms where temperature and humidity control of the indoor environment is required.

[0018] This intelligent control system can switch the operating mode of the entire device based on the data of return air temperature and humidity in the workspace, outdoor temperature and humidity, and target temperature and humidity. This allows the system to utilize outdoor air energy and recover exhaust energy from the workspace while achieving the target temperature and humidity, thus improving the overall energy utilization efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the integrated internal and external circulation heat pump drying device and its intelligent control system in an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the first airflow regulator in an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the condenser in an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the second airflow regulator in an embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram of the third airflow regulator in an embodiment of the present invention.

[0024] Figure 6 This is a schematic diagram of the evaporator in an embodiment of the present invention.

[0025] Figure 7 This is a schematic diagram of the fourth air volume regulator in an embodiment of the present invention. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. Furthermore, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0028] The features and performance of this application will be further described in detail below with reference to the embodiments.

[0029] Example 1

[0030] This embodiment discloses an integrated internal and external circulation heat pump drying device, such as... Figures 1 to 7 As shown, it includes a first airflow regulator 1, a condenser 2, a second airflow regulator 3, a blower 4, a third airflow regulator 6, an evaporator 7, a fourth airflow regulator 8, a compressor 9, and a throttle valve 10; wherein:

[0031] like Figure 1 and Figure 2 As shown, the first air volume regulator 1 includes an air box with four air ports 105 to 108. Each of the four air ports 105 to 108 is equipped with a regulating valve 101 to 104. Specifically, the first air port 105 is connected to the outside, the second air port 106 is connected to the condenser 2, the third air port 107 is connected to the second air volume regulator 3, and the fourth air port 108 is connected to the fourth air volume regulator 8.

[0032] like Figure 1 and Figure 3 As shown, the condenser 2 includes a heat exchange coil 202, a first air passage, and a second air passage. The two ends (203 and 204) of the second air passage are connected to the outside, and its inlet end 204 is equipped with a heat exchange fan 201. The two ends (205 and 206) of the first air passage are connected to the first air volume regulator 1 and the second air volume regulator 3, respectively.

[0033] like Figure 1 and Figure 4 As shown, the second air volume regulator 3 includes an air box with four air ports 305 to 308. The four air ports 305 to 308 are respectively equipped with regulating valves 301 to 304. Specifically, the first air port 305 is connected to the working space 5, the second air port 306 is connected to the condenser 2, the third air port 307 is connected to the first air volume regulator 1, and the fourth air port 308 is connected to the third air volume regulator 6.

[0034] like Figure 1 and Figure 5As shown, the third air volume regulator 6 includes an air box with four air ports 605 to 608. The four air ports 605 to 608 are respectively equipped with regulating valves 601 to 604. Specifically, the first air port 605 is connected to the working space 5, the second air port 606 is connected to the evaporator 7, the third air port 607 is connected to the fourth air volume regulator 8, and the fourth air port 608 is connected to the second air volume regulator 3.

[0035] like Figure 1 and Figure 6 As shown, the evaporator 7 includes a heat exchange coil 707, a first air passage, and a second air passage. The two ends (705 and 706) of the first air passage are connected to the third air volume regulator 6 and the fourth air volume regulator 8, respectively. The inlet end 705 of the first air passage is equipped with a first heat exchange fan 701. The two ends (703 and 704) of the second air passage are connected to the outside, and its inlet end 703 is equipped with a second heat exchange fan 702.

[0036] like Figure 1 and Figure 7 As shown, the fourth air volume regulator 8 includes an air box with four air ports 805 to 808. The four air ports 805 to 808 are respectively equipped with regulating valves 801 to 804. Specifically, the first air port 805 is connected to the outside, the second air port 806 is connected to the evaporator 7, the third air port 807 is connected to the third air volume regulator 6, and the fourth air port 808 is connected to the first air volume regulator 1.

[0037] like Figure 1 As shown, the heat exchange coil 202 of the condenser 2 and the heat exchange coil 707 of the evaporator 7 form a loop through a refrigerant pipeline, and the loop is equipped with a compressor 9 and a throttle valve 10.

[0038] like Figure 1 As shown, the first air volume regulator 1, the first air passage of the condenser 2, the second air volume regulator 3, the blower 4, the working space 5, the third air volume regulator 6, the first air passage of the evaporator 7, and the fourth air volume regulator 8 are connected in sequence through air ducts to form a loop. The first air volume regulator 1 and the second air volume regulator 2, as well as the third air volume regulator 6 and the fourth air volume regulator 8, are also directly connected through air ducts. The first air volume regulator 1 and the fourth air volume regulator 8 each have an air interface that connects to the outside.

[0039] In this embodiment, the workspace 5 is a drying room used for drying crops; of course, this device can also be used in other similar occasions where temperature and humidity control of the indoor environment is required.

[0040] In this embodiment, all regulating valves are electrically operated.

[0041] The device adopts a structure that combines internal and external circulation, avoiding the shortcomings of simply using internal or external circulation. It provides a hardware foundation for utilizing outdoor air energy and recovering exhaust energy from the workspace 5, making it suitable for occasions such as drying rooms where temperature and humidity control of the indoor environment is required.

[0042] Example 2

[0043] This embodiment discloses the intelligent control system of the integrated internal and external circulation heat pump drying device in Embodiment 1, such as... Figure 1 As shown, the device includes a return air temperature and humidity acquisition module 11 for collecting the return air temperature and humidity of the workspace 5, an outdoor temperature and humidity acquisition module 12 for collecting the outdoor temperature and humidity, and an intelligent controller 13. The intelligent controller 13 is electrically connected to the return air temperature and humidity acquisition module 11, the outdoor temperature and humidity acquisition module 12, and each actuator of the integrated internal and external circulation heat pump drying device (the regulating valves on the first to fourth air volume regulators 8, the heat exchange fan 201 of the condenser 2, the blower 4, the first heat exchange fan 701 and the second heat exchange fan 702 of the evaporator 7, and the compressor 9). During operation, the intelligent controller 13 compares the return air temperature and humidity of the workspace with the outdoor temperature and humidity and the target temperature and humidity. By controlling each actuator, it switches the operating mode of the entire device, thereby utilizing outdoor air energy and recovering exhaust energy from the workspace while achieving the target temperature and humidity.

[0044] In this embodiment, the operating modes include: external circulation ventilation mode, external circulation heating mode, external circulation heat recovery heating mode, internal circulation ventilation mode, internal circulation heating mode, internal circulation dehumidification heating mode, and internal circulation dehumidification cooling mode.

[0045] Let the deviation between the return air temperature and the target temperature in the workspace be denoted as . t1, the deviation between the return air humidity and the target humidity in the workspace is denoted as d1, the deviation between the return air temperature and the outdoor temperature in the workspace is denoted as t2, the deviation between the return air humidity and the outdoor humidity in the workspace is denoted as t2. d2, the enthalpy of the return air in the workspace is calculated based on the return air temperature and humidity in the workspace and recorded as h1, and the enthalpy of the outdoor air is calculated based on the outdoor temperature and humidity and recorded as h2.

[0046] If the return air temperature and humidity in the workspace are both lower than the target temperature and humidity, and both are lower than the outdoor temperature and humidity ( t1<0, d1<0, t2<0, If the return air temperature of the working space is less than the target temperature, and the return air temperature and humidity of the working space are both less than the outdoor temperature and humidity (t1 < 0, d1 < 0), and the enthalpy value of the return air in the working space is less than the enthalpy value of the outdoor air (h1 < h2), then the outer circulation ventilation mode is operated: The intelligent controller 13 controls to open the regulating valve 101 of the first air interface 105 of the first air volume regulator 1, the regulating valve 103 of the third air interface 107 of the first air volume regulator 1, the regulating valve 303 of the third air interface 307 of the second air volume regulator 3, the regulating valve 301 of the first air interface 305 of the second air volume regulator 3, the supply fan 4, the regulating valve 601 of the first air interface 605 of the third air volume regulator 6, the regulating valve 603 of the third air interface 607 of the third air volume regulator 6, the regulating valve 803 of the third air interface 807 of the fourth air volume regulator 8, and the regulating valve 801 of the first air interface 805 of the fourth air volume regulator 8; The outdoor air passes through the first air volume regulator 1, the second air volume regulator 3, the supply fan 4, the working space 5, the third air volume regulator 6, and the fourth air volume regulator 8 in sequence and then is discharged outdoors.

[0047] If the return air temperature and humidity of the working space are both less than the target temperature and humidity and are both less than the outdoor temperature and humidity ( t1 < 0, d1 < 0, t2 < 0, d2 < 0), and the enthalpy value of the return air in the working space is greater than the enthalpy value of the outdoor air (h1 > h2), then the inner circulation heating mode is operated: The intelligent controller 13 controls to open the regulating valve 104 of the fourth air interface 108 of the first air volume regulator 1, the regulating valve 102 of the second air interface 106 of the first air volume regulator 1, the regulating valve 302 of the second air interface 306 of the second air volume regulator 3, the regulating valve 301 of the first air interface 305 of the second air volume regulator 3, the supply fan 4, the regulating valve 601 of the first air interface 605 of the third air volume regulator 6, the regulating valve 603 of the third air interface 607 of the third air volume regulator 6, the regulating valve 803 of the third air interface 807 of the fourth air volume regulator 8, the regulating valve 804 of the fourth air interface 808 of the fourth air volume regulator 8, and the compressor 9; The second heat exchange fan 702 of the evaporator 7 and the compressor 9 work, and the air passes through the first air volume regulator 1, the first air channel of the condenser 2, the second air volume regulator 3, the supply fan 4, the working space 5, the third air volume regulator 6, and the fourth air volume regulator 8 in sequence to achieve inner circulation.

[0048] If the return air temperature of the working space is less than the target temperature, and the return air temperature and humidity of the working space are both less than the outdoor temperature and humidity ( t1 < 0, d1 < 0 or d1 > 0, t2 < 0, If the return air temperature of the working space is less than the target temperature, the return air humidity of the working space is greater than the target humidity, and the return air temperature and humidity of the working space are both less than the outdoor temperature and humidity (t1 < 0, d1 > 0, t2 < 0, d2 < 0), and the enthalpy of the return air in the working space is less than that of the outdoor air (h1 < h2), then the outer circulation heating mode is operated: The intelligent controller 13 controls to open the regulating valve 101 of the first air interface 105 of the first air volume regulator 1, the regulating valve 102 of the second air interface 106 of the first air volume regulator 1, the regulating valve 302 of the second air interface 306 of the second air volume regulator 3, the regulating valve 301 of the first air interface 305 of the second air volume regulator 3, the air supply fan 4, the regulating valve 601 of the first air interface 605 of the third air volume regulator 6, the regulating valve 603 of the third air interface 607 of the third air volume regulator 6, the second heat exchange fan 702 of the evaporator 7, the regulating valve 803 of the third air interface 807 of the fourth air volume regulator 8, the regulating valve 801 of the first air interface 805 of the fourth air volume regulator 8, and the compressor 9; The second heat exchange fan 702 and the compressor 9 of the evaporator 7 work, and the outdoor air passes through the first air volume regulator 1, the first air passage of the condenser 2, the second air volume regulator 3, the air supply fan 4, the working space 5, the third air volume regulator 6, and the fourth air volume regulator 8 in sequence and then is discharged to the outside.

[0049] If the return air temperature of the working space is less than the target temperature, the return air humidity of the working space is greater than the target humidity, and the return air temperature and humidity of the working space are both less than the outdoor temperature and humidity ( t1 < 0, d1 > 0, t2 < 0, d2 < 0), and the enthalpy of the return air in the working space is greater than that of the outdoor air (h1 > h2), then the outer circulation heat recovery heating mode is operated: The intelligent controller 13 controls to open the regulating valve 101 of the first air interface 105 of the first air volume regulator 1, the regulating valve 102 of the second air interface 106 of the first air volume regulator 1, the regulating valve 302 of the second air interface 306 of the second air volume regulator 3, the regulating valve 301 of the first air interface 305 of the second air volume regulator 3, the air supply fan 4, the regulating valve 601 of the first air interface 605 of the third air volume regulator 6, the regulating valve 602 of the second air interface 606 of the third air volume regulator 6, the first heat exchange fan 701 of the evaporator 7, the regulating valve 802 of the second air interface 806 of the fourth air volume regulator 8, the regulating valve 801 of the first air interface 805 of the fourth air volume regulator 8, and the compressor 9; The first heat exchange fan 701 and the compressor 9 of the evaporator 7 work, and the outdoor air passes through the first air volume regulator 1, the first air passage of the condenser 2, the second air volume regulator 3, the air supply fan 4, the working space 5, the third air volume regulator 6, the first air passage 701 of the evaporator 7, and the fourth air volume regulator 8 in sequence and then is discharged to the outside.

[0050] If the return air temperature of the working space is less than the target temperature, the return air humidity of the working space is greater than the target humidity, the return air temperature of the working space is less than the outdoor temperature, and the return air humidity of the working space is greater than the outdoor humidity ( t1<0, d1>0, t2<0, If d2>0), then the internal circulation dehumidification and heating mode will be activated: the intelligent controller 13 controls the activation of the regulating valve 104 of the fourth air interface 108 of the first air volume regulator 1, the regulating valve 102 of the second air interface 106 of the first air volume regulator 1, the regulating valve 302 of the second air interface 306 of the second air volume regulator 3, the regulating valve 301 of the first air interface 305 of the second air volume regulator 3, the blower 4, the regulating valve 601 of the first air interface 605 of the third air volume regulator 6, and the regulating valve 606 of the second air interface 606 of the third air volume regulator 6. The system includes a throttle valve 602, a first heat exchange fan 701 in the evaporator 7, a regulating valve 802 in the second air interface 806 of the fourth air volume regulator 8, a regulating valve 804 in the fourth air interface 808 of the fourth air volume regulator 8, and a compressor 9. When the first heat exchange fan 701 and the compressor 9 of the evaporator 7 are working, the air passes through the first air volume regulator 1, the first air passage of the condenser 2, the second air volume regulator 3, the blower 4, the working space 5, the third air volume regulator 6, the first air passage of the evaporator 7, and the fourth air volume regulator 8 in sequence to achieve internal circulation.

[0051] If the return air temperature in the workspace is higher than the target temperature and the return air humidity in the workspace is lower than the target humidity ( t1>0, If d1<0), then the internal circulation ventilation mode is activated: the intelligent controller 13 controls the opening of the regulating valve 301 of the first air interface 305 of the second air volume regulator 3, the regulating valve 304 of the fourth air interface 308 of the second air volume regulator 3, the blower 4, the regulating valve 601 of the first air interface 605 of the third air volume regulator 6, and the regulating valve 604 of the fourth air interface 608 of the third air volume regulator 6; the air passes through the second air volume regulator 3, the blower 4, the working space 5, and the third air volume regulator 6 in sequence to achieve internal circulation.

[0052] If the return air temperature and humidity in the workspace are both greater than the target temperature and humidity ( t1>0, If d1>0), then the internal circulation dehumidification and cooling mode will be activated: the intelligent controller 13 controls the activation of the regulating valve 104 of the fourth air interface 108 of the first air volume regulator 1, the regulating valve 103 of the third air interface 107 of the first air volume regulator 1, the heat exchange fan 201 of the condenser 2, the regulating valve 301 of the first air interface 305 of the second air volume regulator 3, the regulating valve 303 of the third air interface 307 of the second air volume regulator 3, the blower 4, the regulating valve 601 of the first air interface 605 of the third air volume regulator 6, and the regulating valve 603 of the second air interface 6 of the third air volume regulator 6. The regulating valve 602 of port 606, the first heat exchange fan 701 of evaporator 7, the regulating valve 802 of the second air interface 806, the regulating valve 804 of the fourth air interface 808, and the compressor 9; the heat exchange fan 201 of condenser 2, the first heat exchange fan 701 of evaporator 7, and the compressor 9 are working, and the air passes through the first air flow regulator 1, the second air flow regulator 3, the blower 4, the working space 5, the third air flow regulator 6, the first air passage of evaporator 7, and the fourth air flow regulator 8 in sequence to achieve internal circulation.

[0053] In this embodiment, both the return air temperature and humidity acquisition module 11 and the outdoor temperature and humidity acquisition module 12 use temperature and humidity sensors.

[0054] In this embodiment, the return air temperature and humidity acquisition module 11 is located in the workspace 5 near the air duct outlet connected to the third air volume regulator 6.

[0055] This intelligent control system can switch the operating mode of the entire device based on the data of return air temperature and humidity in the workspace, outdoor temperature and humidity, and target temperature and humidity. In this way, while achieving the target temperature and humidity, it can utilize outdoor air energy and recover exhaust energy from the workspace, thereby improving the overall energy utilization efficiency.

[0056] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A heat pump drying device with integrated internal and external circulation, characterized in that: The system includes a condenser, evaporator, compressor, expansion valve, first to fourth airflow regulators, and a blower. The condenser includes heat exchange coils, a first air passage, and a second air passage. Both ends of the second air passage are connected to the outside, and its inlet is equipped with a heat exchange fan. The evaporator also includes heat exchange coils, a first air passage, and a second air passage. The inlet of the first air passage is equipped with a first heat exchange fan, and both ends of the second air passage are connected to the outside, with its inlet equipped with a second heat exchange fan. A refrigerant pipeline connects the heat exchange coils of the condenser and evaporator, forming a loop. A compressor and expansion valve are installed on this loop. The first to fourth air volume regulators each include an air box, and each air box is equipped with multiple air interfaces with regulating valves. The first air volume regulator, the first air passage of the condenser, the second air volume regulator, the blower, the working space, the third air volume regulator, the first air passage of the evaporator, and the fourth air volume regulator are connected in sequence through air ducts to form a loop. The first and second air volume regulators, as well as the third and fourth air volume regulators, are also directly connected through air ducts. The first and fourth air volume regulators each have an air interface that connects to the outside.

2. An intelligent control system for an integrated internal and external circulation heat pump drying device as described in claim 1, characterized in that: It includes a return air temperature and humidity acquisition module for collecting the return air temperature and humidity of the workspace, an outdoor temperature and humidity acquisition module for collecting the outdoor temperature and humidity, and an intelligent controller. The intelligent controller is electrically connected to the return air temperature and humidity acquisition module, the outdoor temperature and humidity acquisition module, and each actuator of the integrated internal and external circulation heat pump drying device. During operation, the intelligent controller compares the return air temperature and humidity of the workspace with the outdoor temperature and humidity and the target temperature and humidity. By controlling each actuator, it switches the operating mode of the entire device, thereby achieving the target temperature and humidity while utilizing outdoor air energy and recovering exhaust energy from the workspace.

3. The intelligent control system of the integrated internal and external circulation heat pump drying device as described in claim 2, characterized in that: The operating modes include external circulation ventilation mode, external circulation heating mode, external circulation heat recovery heating mode, internal circulation ventilation mode, internal circulation heating mode, internal circulation dehumidification heating mode, and internal circulation dehumidification cooling mode.

4. The intelligent control system of the integrated internal and external circulation heat pump drying device as described in claim 3, characterized in that, If the return air temperature and humidity in the workspace are both lower than the target temperature and humidity and lower than the outdoor temperature and humidity, and the enthalpy of the return air in the workspace is lower than the enthalpy of the outdoor air, then the external circulation ventilation mode will be activated: the outdoor air will pass through the first air volume regulator, the second air volume regulator, the supply fan, the workspace, the third air volume regulator, and the fourth air volume regulator in sequence before being discharged to the outside.

5. The intelligent control system of the integrated internal and external circulation heat pump drying device as described in claim 3, characterized in that, If the return air temperature and humidity in the workspace are both lower than the target temperature and humidity and lower than the outdoor temperature and humidity, and the enthalpy of the return air in the workspace is greater than the enthalpy of the outdoor air, then the internal circulation heating mode will be activated: the second heat exchange fan and compressor of the evaporator will work, and the air will sequentially pass through the first air volume regulator, the first air passage of the condenser, the second air volume regulator, the blower, the workspace, the third air volume regulator and the fourth air volume regulator to achieve internal circulation.

6. The intelligent control system of the integrated internal and external circulation heat pump drying device as described in claim 3, characterized in that, If the return air temperature in the working space is lower than the target temperature, the return air temperature and humidity in the working space are both lower than the outdoor temperature and humidity, and the enthalpy of the return air in the working space is lower than the enthalpy of the outdoor air, then the external circulation heating mode will be activated: the second heat exchange fan and compressor of the evaporator will work, and the outdoor air will pass through the first air volume regulator, the first air passage of the condenser, the second air volume regulator, the blower, the working space, the third air volume regulator and the fourth air volume regulator in sequence before being discharged to the outside.

7. The intelligent control system of the integrated internal and external circulation heat pump drying device as described in claim 3, characterized in that, If the return air temperature in the working space is lower than the target temperature, the return air humidity in the working space is higher than the target humidity, and both the return air temperature and humidity in the working space are lower than the outdoor temperature and humidity, and the enthalpy of the return air in the working space is higher than the enthalpy of the outdoor air, then the external circulation heat recovery heating mode will be activated: the first heat exchange fan and compressor of the evaporator will work, and the outdoor air will pass through the first air volume regulator, the first air passage of the condenser, the second air volume regulator, the blower, the working space, the third air volume regulator, the first air passage of the evaporator, and the fourth air volume regulator in sequence before being discharged to the outside.

8. The intelligent control system of the integrated internal and external circulation heat pump drying device as described in claim 3, characterized in that, If the return air temperature in the working space is lower than the target temperature, the return air humidity in the working space is higher than the target humidity, the return air temperature in the working space is lower than the outdoor temperature, and the return air humidity in the working space is higher than the outdoor humidity, then the internal circulation dehumidification and heating mode will be activated: the first heat exchange fan and compressor of the evaporator will work, and the air will sequentially pass through the first air volume regulator, the first air passage of the condenser, the second air volume regulator, the blower, the working space, the third air volume regulator, the first air passage of the evaporator, and the fourth air volume regulator to achieve internal circulation.

9. The intelligent control system of the integrated internal and external circulation heat pump drying device as described in claim 3, characterized in that, If the return air temperature in the workspace is higher than the target temperature and the return air humidity in the workspace is lower than the target humidity, then the internal circulation ventilation mode will be activated: the air will pass through the second air volume regulator, the supply fan, the workspace, and the third air volume regulator in sequence to achieve internal circulation.

10. The intelligent control system of the integrated internal and external circulation heat pump drying device as described in claim 3, characterized in that, If the return air temperature and humidity in the workspace are both higher than the target temperature and humidity, the internal circulation dehumidification and cooling mode will be activated: the heat exchange fan of the condenser, the first heat exchange fan of the evaporator, and the compressor will work, and the air will pass through the first air volume regulator, the second air volume regulator, the blower, the workspace, the third air volume regulator, the first air passage of the evaporator, and the fourth air volume regulator in sequence to achieve internal circulation.

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