A kind of external heat pump unit for drying room

Abstract

The application discloses a kind of external heat pump units for drying room, relate to the technical field of drying equipment.A kind of external heat pump units for drying room, including unit body, heat exchange mechanism and air valve mechanism, wherein unit body is communicated with the return air opening and air outlet of drying room, heat exchange mechanism is used to carry out dehumidification heating to the air entering unit body, and is discharged through air outlet, air valve mechanism includes several groups of air valve, air valve mechanism cooperation air baffle in unit body can divide unit body inside into multiple air chambers, and can be made into different air chambers by opening and closing different air valve to be communicated, form different air duct combination.Heat pump unit can switch multiple different working modes according to the parameter condition of air in drying room, not only be favorable to improve the heat exchange efficiency of heat exchange mechanism, but also can realize the recovery of air heat energy in drying room, reduce electric energy loss.

Description

Technical Field

[0001] This invention relates to the technical field of drying equipment, and in particular to an external heat pump unit for a drying room. Background Technology

[0002] Most drying rooms are equipped with corresponding heat pump dryers. The heat pump dryer is mainly used to provide dry hot air in the drying room, thereby drying the materials in the drying room.

[0003] Currently, heat pump dryers are mainly divided into two types: open-type hot air dryers and closed-type dehumidification dryers. Open-type heat pump dryers introduce fresh air into the drying chamber, heat the fresh air in the condenser in the thermal control room, and then send it into the drying chamber. Closed-type heat pump dryers, on the other hand, directly utilize the air in the drying chamber, first absorbing heat through the evaporator, then heating it through the condenser before sending it back into the drying chamber.

[0004] Open-type hot air drying and closed-type dehumidification drying are two different types of drying equipment based on different principles. Each method has its advantages and disadvantages. For example, when using an open-type hot air drying heat pump dryer, the fresh air needs to be continuously heated and dehumidified, and the compressor needs to expel excess high-temperature heat from the interior to the outside, resulting in low energy efficiency and significant energy loss. Conversely, when using a closed-type dehumidification drying heat pump dryer, the temperature inside the drying chamber reaches the target temperature in the later stages of drying. At this point, the air temperature inside the drying chamber is high and the humidity is low. The evaporator continues to cool, but because the humidity is low, not much water can be condensed, resulting in low evaporator reheat efficiency. This not only directly affects the drying heating efficiency but also leads to energy waste. Summary of the Invention

[0005] In order to improve the overall air duct structure of the heat pump dryer, increase the heat exchange efficiency of the heat pump dryer, and reduce energy waste, this application provides an external heat pump unit for drying rooms.

[0006] The technical solution provided in this application for an external heat pump unit for a drying room is as follows:

[0007] An external heat pump unit for a drying room includes:

[0008] The unit body is provided with a return air inlet and an air outlet that are connected to the drying room, and an exhaust fan that is connected to the external environment.

[0009] A heat exchange mechanism is located inside the unit body and is used to dehumidify and heat the outside air entering through the return air inlet, and then discharge it through the air outlet or the exhaust fan.

[0010] The unit body has several sets of partitions inside. The air valve mechanism is used to cooperate with the partitions to divide the interior of the unit body into multiple air chambers. The air valve mechanism can open and close to make the different air chambers interconnected and form different air duct combinations.

[0011] By adopting the above technical solution, different air duct combinations are formed by controlling the opening and closing of different air valves in the air valve mechanism. This allows the heat pump unit to have multiple operating modes and adjust and switch according to the temperature, humidity, and other conditions of the air inside the drying room. This not only improves the heat exchange efficiency of the heat exchange mechanism but also enables the recovery of heat energy from the air inside the drying room, reducing energy consumption. Optionally, the air cavity includes a first air cavity where the return air inlet is located, a second air cavity where the air outlet is located, and a third air cavity where the exhaust fan is located. The air valve mechanism includes a first air valve, which is disposed between the first air cavity and the third air cavity.

[0012] The heat exchange mechanism includes a compressor unit, an inner evaporator, an outer evaporator, and a condenser connected by interconnected pipes. The compressor unit and the outer evaporator are located in the third air chamber, the inner evaporator is located in the first air chamber, and the condenser is located in the second air chamber.

[0013] By adopting the above technical solution, under normal operating conditions, the first air valve is closed, and the first and second air chambers are interconnected, while the third air chamber is separated from the first air chamber. At this time, the humid and hot air in the drying chamber can enter the first air chamber through the return air inlet, first flowing through the inner evaporator for heat exchange, achieving condensation and dehumidification, then entering the second air chamber and flowing through the condenser for heating, achieving temperature rise and dehumidification, and finally being discharged from the air outlet back into the drying chamber, thus achieving gas circulation within the drying room. In the exhaust state, the first air valve is open, and the third air chamber is interconnected with the first air chamber. Air in the drying room can fully enter the third air chamber from the first air chamber, and after heat energy is recovered by the external evaporator, it is fully discharged through the exhaust fan. At this time, fresh air is introduced into the drying room, thus achieving ventilation.

[0014] Optionally, the heat exchange mechanism further includes a heat exchanger and a circulating fan disposed in the first air cavity. The heat exchanger is a cross-flow heat exchanger. A first partition is connected to the top of the heat exchanger. The heat exchanger and the first partition separate the first air cavity from the second air cavity. A second partition is disposed between the heat exchanger and the inner evaporator. The heat exchanger, the second partition, and the inner evaporator further divide the first air cavity into an air inlet zone, a primary regeneration zone, and a secondary regeneration zone.

[0015] The return air inlet is located in the air inlet zone. The heat exchanger connects the air inlet zone and the primary regenerating zone in a first direction. The internal evaporator connects the primary regenerating zone and the secondary regenerating zone in a second direction. The heat exchanger connects the secondary regenerating zone and the second air chamber in a second direction. The circulating fan is located in the secondary regenerating zone, and the air inlet of the circulating fan faces the internal evaporator.

[0016] By adopting the above technical solution, the hot and humid air in the drying chamber enters the air inlet area from the return air inlet. With the start of the circulating fan, the hot and humid air flows through the heat exchanger in the first direction for the first heat exchange, achieving pre-cooling and cooling. Then it flows through the inner evaporator for the second heat exchange, achieving condensation and dehumidification. Then it flows through the heat exchanger in the second direction for the third heat exchange, achieving preheating and heating. Then it flows through the second air cavity and condenser for the fourth heat exchange, achieving heating and dehumidification. Finally, it is discharged from the air outlet into the drying chamber.

[0017] Optionally, the air valve mechanism further includes a second air valve, which is slidably disposed on the first partition. The condenser, the first partition, and the second air valve further divide the second air chamber into a primary air outlet zone, a gentle air outlet zone, and a secondary air outlet zone. The heat exchanger connects the secondary regenerative zone and the primary air outlet zone. The second air valve is located between the primary air outlet zone and the gentle air outlet zone and is used to connect and separate the primary air outlet zone and the gentle air outlet zone. The condenser connects the gentle air outlet zone and the secondary air outlet zone.

[0018] By adopting the above technical solution, when the second air valve is in the sliding open state, the primary air outlet zone and the slow air zone are interconnected. The dry air, which has undergone condensation and dehumidification in the internal evaporator and recovered some heat energy in the heat exchanger, will directly enter the slow air zone from the primary air outlet zone, flow through the condenser for heating, and then be discharged again from the air outlet 12 to the drying chamber, thus achieving air circulation in the drying chamber. When the second air valve is in the closed state, in conjunction with the opening of the first air valve, the air in the drying chamber can fully enter the third air chamber, and after heat energy is recovered by the external evaporator, it is fully discharged through the exhaust fan. At this time, fresh air is introduced into the drying chamber, thus achieving ventilation of the drying chamber.

[0019] Optionally, a third air valve is provided in the primary air outlet zone, and the third air valve connects the primary air outlet zone and the drying room.

[0020] By adopting the above technical solution, when the second air valve is closed and the third air valve is open, the air that has passed through the internal evaporator and heat exchanger in the first air chamber can be discharged into the drying chamber through the third air valve without flowing through the condenser for heating. This allows for the circulation and dehumidification of the air in the drying chamber without further heating, which is beneficial for controlling the air temperature in the drying chamber. When the second and third air valves are open, the humid and hot air in the drying chamber, along with the dry air coming out of the first air chamber, can flow through the condenser for heat exchange and be discharged. This allows for the heating of the air in the drying chamber while maintaining appropriate humidity, which helps prevent the heat exchange efficiency of the heat exchange mechanism from being affected by excessively low humidity in the drying chamber.

[0021] Optionally, a fourth air valve is provided in the wind-relief zone, and the fourth air valve connects the wind-relief zone to the external environment.

[0022] By adopting the above technical solution, when the fourth air valve is opened, fresh air can be introduced from the external environment. The fresh air flows directly through the condenser for heating and is discharged from the air outlet to the drying room, thus replenishing the fresh air in the drying room.

[0023] Optionally, the unit body is further provided with a dust removal mechanism. The dust removal mechanism includes a first dust removal module for removing dust from the heat exchanger in a first direction. The first dust removal module is disposed in the first-stage regenerating zone. The first dust removal module includes a first sliding seat, a first moving component, and a first dust removal component. The first moving component is used to drive the first sliding seat to reciprocate along the length direction of the heat exchanger.

[0024] The first dust removal component includes a first dust removal arm, which is disposed on the first sliding seat and parallel to the surface of the heat exchanger. The first dust removal arm is provided with a plurality of first nozzles connected to high-pressure air.

[0025] By adopting the above technical solution, the first dust removal arm can spray high-pressure gas from the primary regenerating zone toward the air inlet zone. The sprayed high-pressure gas can fully blow out the dust and impurities in the first direction of the heat exchanger and discharge them through the return air port, thereby achieving the purpose of dust removal. This helps to reduce the adverse effects of ash impurities on the heat exchanger and improve the heat exchange efficiency of the heat exchanger.

[0026] Optionally, the first dust removal component further includes a flipping drive, the first dust removal arm is rotatably connected to the first sliding seat, the drive end of the flipping drive is connected to the rotation shaft of the first dust removal arm, and is used to drive the first dust removal arm to reciprocate between a position parallel to the second partition and a position parallel to the surface of the heat exchanger.

[0027] By adopting the above technical solution, when dust removal is not required, the first dust removal arm can be flipped and folded for storage using the flipping drive component, which can effectively reduce the disturbance of the first dust removal arm to the internal airflow and help ensure the smooth flow of air in the air cavity.

[0028] Optionally, the dust removal mechanism further includes a second dust removal module for removing dust from the heat exchanger in a second direction. The second dust removal module is disposed in the secondary regenerative zone. The second dust removal module includes a second sliding seat, a second moving component, and a second dust removal arm. The second moving component is used to drive the second sliding seat to reciprocate along the length direction of the heat exchanger. The second dust removal arm is disposed on the second sliding seat and is parallel to the surface of the heat exchanger. The second dust removal arm is provided with a plurality of second nozzles connected to high-pressure air.

[0029] By adopting the above technical solution, the second dust removal arm can spray high-pressure gas from the secondary regenerating zone toward the second air chamber. The sprayed high-pressure gas can fully blow out the dust and impurities in the second direction of the heat exchanger, achieving the purpose of dust removal. This helps to reduce the adverse effects of ash impurities on the heat exchanger and further improve the heat exchange efficiency of the heat exchanger.

[0030] In summary, the technical solution of this application possesses at least one of the following beneficial effects:

[0031] 1. By controlling the opening or closing of different air valves in the air valve mechanism, different air duct combinations are formed, so that the heat pump unit can have multiple working modes and can adjust and switch according to the temperature, humidity and other conditions of the air inside the drying room. This not only helps to improve the heat exchange efficiency of the heat exchange mechanism, but also realizes the recovery of heat energy from the air inside the drying room and reduces power consumption.

[0032] 2. By setting up a dust removal mechanism, it is beneficial to reduce the adverse effects of dust and impurities on the heat exchanger and improve the heat exchange efficiency of the heat exchanger. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of an external heat pump unit for a drying room according to an embodiment of this application.

[0034] Figure 2 This is a cross-sectional view of an external heat pump unit for a drying room according to an embodiment of this application.

[0035] Figure 3 This is a schematic diagram of the air cavity of an external heat pump unit for a drying room according to an embodiment of this application.

[0036] Figure 4 This is a schematic diagram of the first mode of an external heat pump unit for a drying room in an embodiment of this application, wherein the dashed line represents the airflow direction.

[0037] Figure 5 This is a schematic diagram of a second mode of an external heat pump unit for a drying room according to an embodiment of this application, wherein the dashed line represents the airflow direction.

[0038] Figure 6 This is a schematic diagram of the third mode of an external heat pump unit for a drying room in an embodiment of this application, where the dashed line represents the airflow direction.

[0039] Figure 7 This is a diagram illustrating the internal structure of an external heat pump unit for a drying room, as described in an embodiment of this application.

[0040] Figure 8 yes Figure 7 A magnified view of part a in the middle.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Unit body; 11. Return air inlet; 12. Air outlet; 13. Exhaust fan; 14. Baffle; 141. First baffle; 142. Second baffle; 15. Air cavity; 151. First air cavity; 1511. Air inlet zone; 1512. Primary regeneration zone; 1513. Secondary regeneration zone; 152. Second air cavity; 1521. Primary air outlet zone; 1522. Soft air zone; 1523. Secondary air outlet zone; 153. Third air cavity; 2. Heat exchange mechanism; 21. Compressor unit; 22. Internal evaporator; 23. External evaporator; 24. Condenser; 25. Heat exchanger; 26. Circulating fan; 3. Air valve mechanism; 31, first air valve; 32, second air valve; 33, third air valve; 34, fourth air valve; 4, dust removal mechanism; 41, first dust removal module; 411, first sliding seat; 412, first moving component; 4121, first lead screw; 4122, first guide rod; 4123, first sliding drive component; 413, first dust removal component; 4131, first dust removal arm; 41311, first nozzle; 4132, tilting drive component; 42, second dust removal module; 421, second sliding seat; 422, second moving component; 423, second dust removal arm; 4231, second nozzle.

[0043] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0044] This application discloses an external heat pump unit for a drying room. (Refer to...) Figure 1 , Figure 2 and Figure 3An external heat pump unit for drying rooms is disclosed, suitable for heating and dehumidifying the air inside conventional drying rooms, and detachably connected to the drying room. Specifically, it includes a unit body 1, a heat exchange mechanism 2, and an air valve mechanism 3. The unit body 1 has a return air inlet 11 and an air outlet 12 communicating with the drying room, and an exhaust fan 13 communicating with the external environment. The heat exchange mechanism 2 is located in the unit body 1. External air to be dehumidified, including but not limited to high-humidity air generated after drying materials in the drying room, can enter the unit body 1 through the return air inlet 11, and then be dehumidified and heated by the heat exchange mechanism 2 inside the unit body 1 to form dry and high-temperature air, which is then discharged from the air outlet 12 and sent into the drying room to dry the materials, thereby realizing the circulation of drying hot air in the drying room; or the heat energy is recovered by the heat exchange mechanism 2 inside the unit body 1 and discharged to the external environment through the exhaust fan 13. In addition, several sets of partitions 14 are provided in the unit body 1. The air valve mechanism 3 is used to cooperate with the partitions 14 to divide the unit body 1 into multiple air chambers 15. By opening and closing the air valve mechanism 3, different air chambers 15 can be connected to each other, thereby forming different air ducts. The heat pump unit can switch different air ducts according to the conditions in the drying room to realize different working modes. This not only helps to improve the heat exchange efficiency of the heat exchange mechanism 2, but also enables the recovery of air heat energy in the drying room and reduces power consumption.

[0045] Reference Figure 2 and Figure 3The unit body 1 is internally divided into a first air chamber 151, a second air chamber 152, and a third air chamber 153 by a partition 14 and a damper assembly. A return air inlet 11 is located on the side wall of the first air chamber 151, connecting it to the drying chamber. An air outlet 12 is located on the top wall of the second air chamber 152, connecting it to the drying chamber. An exhaust fan 13 is located on the side wall of the third air chamber 153, discharging air from the third air chamber 153 to the outside environment. The heat exchange mechanism 2 includes a compressor unit 21, an internal evaporator 22, an external evaporator 23, and a condenser 24, all interconnected by pipes. The internal evaporator 22 is located in the first air chamber 151, the condenser 24 is located in the second air chamber 152, and both the compressor unit 21 and the external evaporator 23 are located in the third air chamber 153. When heating, the compressor unit 21 generates high-temperature, high-pressure refrigerant gas which releases heat in the condenser 24. The gas then enters the inner evaporator 22 and the outer evaporator 23. The inner evaporator 22 absorbs heat from the air in the first air chamber 151, causing the refrigerant to turn back into gas and be compressed in the compressor. This achieves a cyclical heat exchange reaction. When the humid air in the drying room enters the first air chamber 151 from the return air vent 11, the evaporation of the refrigerant in the inner evaporator 22 absorbs heat, cooling the humid air to its dew point temperature, achieving condensation and dehumidification. The dehumidified air then flows along the duct into the second air chamber 152, passes through the condenser 24 for heating, and finally exits from the air outlet 12 back into the drying room, completing air circulation.

[0046] Furthermore, refer to Figure 2 and Figure 3 The air valve mechanism 3 includes a first air valve 31, which is located between the first air chamber 151 and the third air chamber 153. When the first air valve 31 is opened, the first air chamber 151 and the third air chamber 153 are connected to each other, so that the humid and hot air in the first air chamber 151 can be discharged to the third air chamber 153, and after heat exchange through the external evaporator 23, it is discharged to the outside environment, realizing the effect of heat energy recovery of the discharged air, which is conducive to reducing the power consumption of the heat exchange unit and improving the heating effect of the condenser 24.

[0047] Reference Figure 2 and Figure 3Specifically, the heat exchange mechanism 2 also includes a heat exchanger 25 and a circulating fan 26. The heat exchanger 25 is used to perform preliminary heat recovery on the humid and hot air entering the first air chamber 151. In this embodiment, the heat exchanger 25 is specifically a cross-flow heat exchanger 25, while the circulating fan 26 is used to supply air, so that the humid and hot air in the drying room can flow fully through the air duct in the unit body 1. Specifically, the heat exchanger 25 is disposed in the first air chamber 151, and a first partition 141 is detachably connected to the top of the heat exchanger 25. The heat exchanger 25, together with the first partition 141, separates the first air chamber 151 and the second air chamber 152 from each other. A second partition 142 connects the heat exchanger 25 and the inner evaporator 22. The heat exchanger 25, together with the inner evaporator 22 and the second partition 142, further divides the first air chamber 151 into an air inlet zone 1511, a primary regeneration zone 1512, and a secondary regeneration zone 1513. The return air inlet 11 is located in the air inlet zone 1511. The heat exchanger 25 is connected to the air inlet zone 1511 and the primary regeneration zone 1512 in the first direction. The inner evaporator 22 is connected to the primary regeneration zone 1512 and the secondary regeneration zone 1513 in the second direction. The heat exchanger 25 is connected to the secondary regeneration zone 1513 and the second air chamber 152 in the second direction. The circulating fan 26 is located in the secondary regeneration zone 1513, and the air inlet of the circulating fan 26 faces the inner evaporator 22. Thus, the circulating fan 26 can not only draw air from the primary regeneration zone 1512 through the inner evaporator 22 into the secondary regeneration zone 1513, but also transport the air in the secondary regeneration zone 1513 to the second air chamber 152 along the second direction of the heat exchanger 25.

[0048] Reference Figure 2 and Figure 3 A second air valve 32 is slidably disposed on the first partition 141. Specifically, in this embodiment, the second air valve 32 is slidably driven by a servo cylinder. The condenser 24, together with the first partition 141 and the second air valve 32, further divides the second air chamber 152 into a primary air outlet zone 1521, a gentle air outlet zone 1522, and a secondary air outlet zone 1523. The heat exchanger 25 connects the secondary regenerative zone 1513 and the primary air outlet zone 1521 in the second direction. A second air valve 32 is located between the primary air outlet zone 1521 and the slow-flow zone 1522, and can be slidably connected or disconnected between them. A third air valve 33 is installed in the primary air outlet zone 1521, connecting it to the drying chamber. When the second air valve 32 is slid closed, separating the primary air outlet zone 1521 and the slow-flow zone 1522, the third air valve 33 opens. Dry air that has undergone condensation and dehumidification in the internal evaporator 22 and has recovered some heat energy in the heat exchanger 25 can be discharged into the drying chamber through the third air valve 33. Furthermore, when both the second and third air valves 32 and 33 are open, the humid and hot air in the drying chamber, along with the dry air exiting the first air chamber 151, flows through the condenser 24 for heat exchange and is then discharged.

[0049] Reference Figure 2 and Figure 3 The condenser 24 connects the slow air zone 1522 and the secondary air outlet zone 1523. Under normal operating conditions, the second air valve 32 is in the sliding open state, and the primary air outlet zone 1521 and the slow air zone 1522 are interconnected, while the third air valve 33 is in the closed state. The dry air that has been condensed and dehumidified by the internal evaporator 22 and has recovered some heat energy in the heat exchanger 25 will directly enter the slow air zone 1522 from the first air outlet zone, then flow through the condenser 24 for heating, and then be discharged again from the air outlet 12 to the drying room, thus realizing the air circulation in the drying room.

[0050] Reference Figure 1 , Figure 2 and Figure 3 The air vent 1522 is also equipped with a fourth air valve 34. The fourth air valve 34 connects the external environment and the air vent 1522. When the fourth air valve 34 is opened, the unit body 1 can introduce fresh air from the external environment. The fresh air then flows through the condenser 24 for heating and is discharged from the air outlet 12 to the drying room, thus replenishing the fresh air in the drying room.

[0051] As can be seen from the above, the heat pump unit in this embodiment can have multiple operating modes by controlling the opening and closing of the non-ventilation valve. The specific principles of the different operating modes are as follows:

[0052] First mode, refer to Figure 4 In this working mode, the first air valve 31, the third air valve 33, and the fourth air valve 34 are closed, and the second air valve 32 is opened. Then, the hot and humid air in the drying room enters the air inlet zone 1511 from the return air inlet 11. With the start of the circulating fan 26, the hot and humid air flows through the heat exchanger 25 in the first direction for the first heat exchange, achieving pre-cooling and cooling. Then it flows through the inner evaporator 22 for the second heat exchange, achieving condensation and dehumidification. Then it flows through the heat exchanger 25 in the second direction for the third heat exchange, achieving pre-heating and heating. Then it flows through the second air chamber 152 and the condenser 24 for the fourth heat exchange, achieving heating and dehumidification. Finally, it is discharged from the air outlet 12 into the drying room.

[0053] In this operating mode, the air inside the drying chamber and the heat pump unit is internally circulated. This facilitates thorough dehumidification of the air inside the drying chamber when the ambient humidity is significantly higher than the humidity inside the drying chamber, thereby reducing the overall energy consumption of the heat pump unit. Simultaneously, the heat exchanger 25 recovers heat from the air input from the drying chamber and preheats the air flowing in the second direction, which helps reduce the load on the internal evaporator and condenser, further reducing the energy consumption of the compressor unit.

[0054] Second mode, refer to Figure 5In this operating mode, the first air valve 31 and the fourth air valve 34 are open, while the second air valve 32 and the third air valve 33 are closed. This allows the hot and humid air in the drying chamber to enter the air inlet zone 1511 through the return air vent 11. With the start of the exhaust fan 13, the hot and humid air flows through the heat exchanger 25 and then from the first air chamber 151 into the third air chamber 153. After heat exchange in the external evaporator, it is discharged into the external environment. Simultaneously, to balance the air pressure inside the drying chamber, fresh air from the outside environment enters the heat pump unit through the fourth air valve 34, flows through the condenser 24 for heat exchange, and is discharged into the drying chamber through the air outlet 12.

[0055] In this operating mode, the air in the drying room and the heat pump unit is circulated externally, which not only fully exhausts the stale air inside the drying room, but also introduces fresh air from outside, which helps to improve the air quality inside the drying room.

[0056] The third mode, refer to Figure 6 In this operating mode, the first air valve 31, the second air valve 32, the third air valve 33, and the fourth air valve 34 are all opened. The hot and humid air in the drying chamber enters the air inlet zone 1511 through the return air inlet 11. With the start of the circulating fan 26, the hot and humid air flows through the heat exchanger 25 in the first direction for initial heat exchange, achieving pre-cooling. Then, some of the air in the primary regenerative zone 1512 flows sequentially through the inner evaporator 22, the second direction of the heat exchanger 25, and the condenser 24 for heat exchange, as in the first mode, and is discharged from the air outlet 12 into the drying chamber. The remaining air flows through the first air valve 31 into the third air chamber 153 and flows through the outer evaporator 23 for heat exchange, finally being discharged to the outside through the exhaust fan 13. Additionally, some of the hot air entering the drying chamber through the third air valve 33 and the fresh air entering through the fourth air valve 34 are both driven by the airflow of the circulating fan 26, flowing through the condenser 24 for heat exchange, and then discharged from the air outlet 12 into the drying chamber.

[0057] In this working mode, the air in the drying room and the heat pump unit can be circulated internally and externally at the same time. By controlling the opening size of different air valves, the airflow through different air ducts can be adjusted. If an external sensor is used, the heat pump unit can automatically and flexibly switch between the first mode and the second mode, which helps to improve the flexibility of the heat pump unit and adapt to the complex and ever-changing drying room environment.

[0058] In addition, the heat pump unit in this embodiment also has other different working modes. Other working modes can be controlled by opening or closing different air valves in the air valve mechanism 3 according to the air demand or energy consumption requirements of the drying room, forming a variety of different air duct combinations, and realizing the switching of other working modes. This will not be elaborated on here.

[0059] Reference Figure 7 and Figure 8Since the return air vent 11 serves as the main air inlet of the unit body for most of the time, dust and impurities in the drying chamber easily enter the return air vent 11 with the airflow and adhere to the surface of the heat exchanger. Therefore, a dust removal mechanism 4 is also provided inside the unit body 1 to clean the dust and impurities accumulated on the surface of the heat exchanger 25, thereby improving the heat exchange efficiency of the heat exchanger 25 after long-term use. Specifically, the dust removal mechanism 4 includes a first dust removal module 41 and a second dust removal module 42, wherein the first dust removal module 41 is used to remove dust from the heat exchanger 25 in a first direction, and the second dust removal module 42 is used to remove dust from the heat exchanger 25 in a second direction.

[0060] Reference Figure 1 and Figure 8 The first dust removal module 41 is disposed in the primary regenerative zone 1512. The first dust removal module 41 includes a first sliding seat 411, a first moving component 412, and a first dust removal component 413. The first dust removal component 413 is mounted on the first sliding seat 411, and the first moving component 412 is used to drive the first sliding seat 411 to reciprocate along the length direction of the heat exchanger 25. Specifically, the first moving component 412 includes a first lead screw 4121, a first guide rod 4122, and a first sliding drive component 4123. The first lead screw 4121 and the first guide rod 4122 extend along the length direction of the heat exchanger 25 and are mounted on the second partition 142. The driving end of the first sliding drive component 4123 is connected to the first lead screw 4121 and is used to drive the first lead screw 4121 to rotate. The first sliding seat 411 is slidably disposed on the first lead screw 4121 and the first guide rod 4122.

[0061] Reference Figure 8 The first dust removal component 413 includes a first dust removal arm 4131 and a flipping drive 4132. The first dust removal arm 4131 is rotatably connected to the first sliding seat 411. The driving end of the flipping drive 4132 is connected to the rotation shaft of the first dust removal arm 4131 via a bevel gear transmission and is used to drive the first dust removal arm 4131 to rotate and flip. Specifically, the flipping drive 4132 enables the first dust removal arm 4131 to flip from a position parallel to the second partition 142 to a position parallel to the surface of the heat exchanger 25. When dust removal is not required, the first dust removal arm 4131 can be folded and stored in a position parallel to the second partition 142, thereby effectively reducing the disturbance of the internal airflow by the first dust removal arm 4131 and helping to ensure stable airflow within the air cavity 15. The first dust removal arm 4131 is equipped with several sets of first nozzles 41311. The first nozzles 41311 are connected to high-pressure air, so that the first dust removal arm 4131 can spray high-pressure air from the first-stage regenerating zone 1512 toward the air inlet zone 1511. The sprayed high-pressure gas can fully blow out the dust and impurities in the first direction of the heat exchanger 25 and discharge them from the return air port 11, thereby achieving the purpose of dust removal.

[0062] Reference Figure 1 and Figure 8 The second dust removal module 42 is disposed in the secondary regenerating zone 1513. The second dust removal module 42 includes a second sliding seat 421, a second moving component 422, and a second dust removal arm 423. In this embodiment, the second moving component 422 is the same as the first moving component 412 and is used to drive the second sliding seat 421 to reciprocate along the length of the heat exchanger 25. The second dust removal arm 423 is mounted on the second sliding seat 421 and is parallel to the surface of the heat exchanger 25. The second dust removal arm 423 is also provided with several sets of second nozzles 4231 that are connected to high-pressure air. Thus, the second dust removal arm 423 can spray high-pressure air from the secondary regenerating zone 1513 toward the primary air outlet zone 1521. The sprayed high-pressure gas can fully blow out the dust and impurities in the second direction of the heat exchanger 25 and discharge them from the third air valve 33, thereby achieving the purpose of dust removal.

[0063] When dust removal and cleaning are required, simply disassemble the entire unit body 1 from one side of the drying room, allowing the return air vent 11 and the third air valve 33 to connect with the external environment. Then, start the first and second dust removal modules. The high-pressure gas sprayed out will fully blow the dust and impurities attached to the heat exchanger 25 in the first and second directions towards the external environment, achieving the purpose of thorough dust removal without disassembling the internal parts of the unit body 1.

[0064] The implementation principle of an external heat pump unit for a drying room according to an embodiment of this application is as follows:

[0065] By controlling the opening or closing of different air valves in the air valve mechanism 3, different air duct combinations are formed, so that the heat pump unit can have multiple working modes and can adjust and switch according to the temperature, humidity and other conditions of the air inside the drying room. This not only helps to improve the heat exchange efficiency of the heat exchange mechanism 2, but also enables the recovery of heat energy from the air inside the drying room and reduces power consumption.

[0066] In addition, by setting up a dust removal mechanism 4 to remove dust from the heat exchanger 25, the adhesion of dust and impurities on the surface of the heat exchanger 25 can be significantly reduced, which is beneficial to improving the heat exchange efficiency of the heat exchanger 25, and thus can have a beneficial effect on the heat exchange efficiency of the subsequent heat exchange mechanism 2.

[0067] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this specific embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. An external heat pump unit for a drying chamber, characterized in that, The utility model relates to a kind of air conditioning units, including: Machine group body (1), the machine group body (1) is opened with the return air inlet (11) and air outlet (12) being communicated with drying room, and be provided with exhaust fan (13) being communicated with external environment; Heat exchange mechanism (2) is arranged in the inside of the machine group body (1), and is used to dehumidify and heat the air entered by the return air inlet (11), and is discharged by the air outlet (12) or the exhaust fan (13); Air valve mechanism (3), the machine group body (1) is arranged with several groups of baffle (14) inside, the air valve mechanism (3) cooperates the baffle (14) and divides the machine group body (1) into multiple air chambers (15) inside, and the air valve mechanism (3) can be communicated by opening and closing to make different air chambers (15) and form different air duct combinations; The air chamber (15) includes the first air chamber (151) where the return air inlet (11) is located, the second air chamber (152) where the air outlet (12) is located and the third air chamber (153) where the exhaust fan (13) is located, and the air valve mechanism (3) includes a first air valve (31), and the first air valve (31) is arranged between the first air chamber (151) and the third air chamber (153); The heat exchange mechanism (2) includes a compressor unit (21), an inner evaporator (22), an outer evaporator (23) and a condenser (24) connected by pipelines, the compressor unit (21) and the outer evaporator (23) are arranged in the third air chamber (153), the inner evaporator (22) is arranged in the first air chamber (151), and the condenser (24) is arranged in the second air chamber (152); The heat exchange mechanism (2) further includes a heat exchanger (25) and a circulating fan (26) arranged in the first air chamber (151), the heat exchanger (25) is a cross-flow heat exchanger (25), the top of the heat exchanger (25) is connected with a first baffle (141), the heat exchanger (25) and the first baffle (141) separate the first air chamber (151) and the second air chamber (152) from each other, a second baffle (142) is arranged between the heat exchanger (25) and the inner evaporator (22), and the heat exchanger (25), the second baffle (142) and the inner evaporator (22) further divide the first air chamber (151) into an air inlet area (1511), a primary heat recovery area (1512) and a secondary heat recovery area (1513); The return air inlet (11) is arranged in the air inlet area (1511), a first direction of the heat exchanger (25) communicates the air inlet area (1511) and the primary heat recovery area (1512), the inner evaporator (22) communicates the primary heat recovery area (1512) and the secondary heat recovery area (1513), a second direction of the heat exchanger (25) communicates the secondary heat recovery area (1513) and the second air chamber (152), the circulating fan (26) is arranged in the secondary heat recovery area (1513), and the air inlet end of the circulating fan (26) faces the inner evaporator (22). The air valve mechanism (3) further comprises a second air valve (32) slidingly arranged on the first partition plate (141), the condenser (24), the first partition plate (141) and the second air valve (32) further divide the second air cavity (152) into a first air outlet area (1521), a slow air area (1522) and a second air outlet area (1523), the heat exchanger (25) communicates the second heat recovery area (1513) with the first air outlet area (1521), the second air valve (32) is located between the first air outlet area (1521) and the slow air area (1522) and is used for realizing the communication and separation of the first air outlet area (1521) and the slow air area (1522), and the condenser (24) communicates the slow air area (1522) with the second air outlet area (1523); The first air outlet area (1521) is provided with a third air valve (33) communicating the first air outlet area (1521) with the drying room, and the slow air area (1522) is provided with a fourth air valve (34) communicating the slow air area (1522) with the external environment.

2. The external heat pump unit for drying chamber according to claim 1, characterized in that: The unit body (1) is further provided with a dust removal mechanism (4), the dust removal mechanism (4) comprises a first dust removal module (41) for dust removal in the first direction of the heat exchanger (25), the first dust removal module (41) is arranged in the first heat recovery area (1512), and the first dust removal module (41) comprises a first sliding seat (411), a first moving part (412) and a first dust removal part (413), the first moving part (412) is used for driving the first sliding seat (411) to reciprocatingly slide along the length direction of the heat exchanger (25); The first dust removal part (413) comprises a first dust removal arm (4131), the first dust removal arm (4131) is arranged on the first sliding seat (411) and is parallel to the surface of the heat exchanger (25), and the first dust removal arm (4131) is provided with a plurality of groups of first nozzles (41311) connected with high-pressure air.

3. The external heat pump unit for a drying chamber according to claim 2, characterized in that: The first dust removal part (413) further comprises a turnover driving member (4132), the first dust removal arm (4131) is rotationally connected with the first sliding seat (411), the driving end of the turnover driving member (4132) is connected with the rotation shaft of the first dust removal arm (4131), and the turnover driving member (4132) is used for driving the first dust removal arm (4131) to reciprocatingly turn between a position parallel to the second partition plate (142) and a position parallel to the surface of the heat exchanger (25).

4. The external heat pump unit for a drying chamber according to claim 2, characterized in that: The dust removal mechanism (4) further comprises a second dust removal module (42) for dust removal in the second direction of the heat exchanger (25), the second dust removal module (42) is arranged in the secondary regenerative zone (1513), the second dust removal module (42) comprises a second sliding seat (421), a second moving part (422) and a second dust removal arm (423), the second moving part (422) is used for driving the second sliding seat (421) to reciprocate along the length direction of the heat exchanger (25), the second dust removal arm (423) is arranged on the second sliding seat (421) and is parallel to the surface of the heat exchanger (25), and the second dust removal arm (423) is provided with a plurality of groups of second nozzles (4231) connected with high-pressure air.

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