Industrial air source heat pump unit

Abstract

The invention relates to the technical field of air source heat pumps, in particular to an industrial air source heat pump unit which comprises a rack, a compressor, a condenser, a fan, an expansion valve, a main evaporator, an auxiliary evaporator, an air exchange assembly and a defroster. A first electromagnetic valve is installed among the main evaporator, the auxiliary evaporator and the expansion valve, door plates are arranged on the machine frame, the air exchange assembly is arranged in the machine frame, and the air exchange assembly is connected with the two door plates. The evaporator for quick drying is communicated to the outside to heat the introduced fresh air to avoid frosting, and meanwhile, the mode that the evaporator for quick drying is used for liquefying the air discharged to the outside to extract metabolites in the air is utilized, so that the humidity of the drying room is quickly reduced, and meanwhile, the humidity is kept in a proper range; and air between the drying room and the outside is exchanged.

Description

Technical Field

[0001] The present invention relates to the technical field of air source heat pumps, in particular to an industrial air source heat pump unit. Background Art

[0002] Air source heat pump units can convert the difficult-to-use low-level thermal energy in the air into usable high-level thermal energy. Since air can be obtained free of charge, air source heat pump units are more energy-efficient than common refrigeration or heating equipment such as air conditioners. Therefore, they are widely used in various industries, such as in the industrial field for drying tea.

[0003] Air source heat pump units used for drying operations are usually divided into split type and integral type. When the split type is working, on the one hand, fresh air is introduced from the outside and passed into the drying room after passing through the condenser; on the other hand, the air in the drying room is extracted and the extracted air is discharged to the outside after passing through the evaporator. This type of air source heat pump unit is not suitable for tea drying, because tea leaves must be fermented during the drying process to ensure their taste and nutrition, which requires not only suitable temperature but also suitable humidity. When the split type is working, the air in the drying room is constantly exchanged with the outside, so it takes time and is difficult to control the humidity reduction in the drying room; when the integral type is working, the condenser and the evaporator are wrapped in the same channel, and a fan is arranged between the two, so that the air in the drying room is directly discharged to the condenser after passing through the evaporator, and liquefied on the surface of the condenser to reduce the air humidity. The air discharged to the condenser is heated again by the condenser and passed into the drying room. This method allows the air in the drying room to circulate continuously between the evaporator and the condenser, and is not exchanged with the outside air. Therefore, the humidity in the drying room can be quickly reduced, thereby providing a suitable environment for the fermentation of tea leaves during the drying process.

[0004] The principle of air source heat pump unit drying air is to use the evaporation process of refrigerant in the evaporator to absorb the heat on the surface of the evaporator, so that the air in the drying room is cooled and liquefied when discharged. At the same time, this is also the principle of air source heat pump unit to obtain low-level thermal energy in the air. Therefore, compared with general equipment, the surface area of ​​the evaporator of air source heat pump unit is usually larger, but this also leads to the following problems: Although the air source heat pump unit can quickly heat up and reduce humidity in the initial operation, thereby providing an environment for drying tea leaves, after the temperature and humidity in the drying room are stabilized in the appropriate range, the lower temperature on the evaporator surface will still cause the air in the drying room to continue to liquefy (even if the refrigerant inside the evaporator does not circulate, the refrigerant will be in a continuous boiling state due to its own lower boiling point under low pressure, so that the evaporator surface is always in a low temperature state), which leads to the phenomenon of too low humidity in the drying room. In addition, during the drying process, the fermentation of tea leaves will consume oxygen and volatilize metabolites, and the drying process usually takes several days or longer. Therefore, the oxygen content in the drying room will continue to decrease and the metabolite content will continue to increase, thereby inhibiting the fermentation of tea leaves.

[0005] Therefore, an industrial air source heat pump unit is proposed. Summary of the invention

[0006] The object of the present invention is to provide an industrial air source heat pump unit, which solves the problem that the air source heat pump unit makes the humidity in the drying room too low and inhibits the fermentation of tea leaves when drying tea leaves. By switching two evaporators, the heat pump unit can quickly dry and moisturize the air respectively, and the evaporator used for quick drying is connected to the outside world to heat the introduced fresh air to avoid frost. At the same time, the evaporator used for quick drying is used to liquefy the air discharged to the outside world and extract metabolites in the air. This achieves the purpose of quickly reducing the humidity in the drying room while keeping the humidity in an appropriate range and exchanging the air between the drying room and the outside world.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] An industrial air source heat pump unit comprises a frame, a compressor, a condenser, a fan and an expansion valve, the frame comprises an inner air supply port, an inner air exhaust port, an outer air exhaust port and an outer air supply port, and also comprises a main evaporator, an auxiliary evaporator, an air exchange component and a defroster, the main evaporator and the auxiliary evaporator are both mounted on the inner air exhaust port of the frame, and the windward area of ​​the main evaporator is larger than the windward area of ​​the auxiliary evaporator, the main evaporator and the auxiliary evaporator are both connected to the expansion valve, and a first solenoid valve is installed between the three, the main evaporator and the auxiliary evaporator are both connected to the compressor, the outer air exhaust port and the outer air supply port are both arranged with door panels, the air exchange component is arranged inside the frame, and the air exchange component is connected to two door panels, refrigerant is stored inside the air exchange component, the defroster is mounted on the outer air supply port, and the defroster can be connected to the condenser, the expansion valve and the air exchange component;

[0009] The first solenoid valve controls the expansion valve to be connected to the main evaporator or the auxiliary evaporator to quickly dry or moisturize the room air, the air exchange component pulls the door panel inward to allow the fan to introduce fresh air from the outside, and the air exchange component passes its own stored refrigerant into the defroster to avoid frosting at the external air outlet, and the main evaporator involved in the air exchange uses its large windward area to liquefy the exhausted air and extract harmful substances.

[0010] After the refrigerant is discharged from the expansion valve, it is in a gas-liquid mixed state and completely evaporates and gasifies in the main evaporator or the auxiliary evaporator. When the refrigerant is passed into the circulation pipeline, the inside of the pipeline is in a vacuum state. Therefore, the vaporized refrigerant still has a tendency to fall under the action of its own gravity.

[0011] Preferably, the main evaporator and the auxiliary evaporator are both located below the first solenoid valve, and the main evaporator and the auxiliary evaporator are arranged in a transverse arrangement;

[0012] Through the above scheme, it is ensured that when the first solenoid valve works to change the circulation state of the refrigerant (switching between the main evaporator and the auxiliary evaporator), the main evaporator or the auxiliary evaporator that does not participate in the refrigerant circulation can discharge the refrigerant inside itself along the pipes of the transverse pipes, so that the refrigerant can fully participate in the circulation to avoid affecting the working efficiency of the air source heat pump unit, and when the auxiliary evaporator participates in the circulation, the main evaporator discharges the internal refrigerant, which can gradually heat up its own surface, thereby avoiding liquefaction of the discharged air, thereby achieving a better moisturizing effect.

[0013] Preferably, the first solenoid valve is a two-position three-way type, and the ends of the main evaporator and the auxiliary evaporator connected to the compressor are both provided with a one-way valve, and the one-way valve leads to the compressor;

[0014] In the above scheme, the inlet of the first solenoid valve is connected to the expansion valve, and the two outlets are connected to the main evaporator and the auxiliary evaporator respectively, so that the refrigerant discharged from the expansion valve is directed to the main evaporator or the auxiliary evaporator by the displacement of the valve core inside the solenoid valve. A one-way valve is arranged at the end where the main evaporator and the auxiliary evaporator are connected to the compressor to prevent the refrigerant in the main evaporator or the auxiliary evaporator from flowing back into the auxiliary evaporator or the main evaporator when flowing to the compressor, thereby ensuring the working efficiency of the air source heat pump unit.

[0015] During the operation of the air source heat pump unit, due to the evaporation heat absorption of the refrigerant inside the main evaporator or the auxiliary evaporator, the surface of the main evaporator or the auxiliary evaporator will be maintained at a relatively low temperature. Therefore, the hot air discharged from the drying room (compared to the boiling point of the low-pressure refrigerant inside the main evaporator or the auxiliary evaporator) will continue to liquefy after passing through the main evaporator or the auxiliary evaporator, and form small water droplets on the surface of the main evaporator or the auxiliary evaporator and gradually fall;

[0016] Preferably, a water receiving tank is provided at the inner air outlet, the auxiliary evaporator is arranged in the water receiving tank, and the water receiving tank is communicated with the outside;

[0017] In the above scheme, a water receiving trough is provided at the inner exhaust port, and the water receiving trough is arranged below the main evaporator and the auxiliary evaporator, so as to receive small water droplets falling from the surface of the main evaporator or the auxiliary evaporator, and the auxiliary evaporator is arranged in the water receiving trough to reduce the contact between the air discharged from the inner exhaust port and the auxiliary evaporator, thereby weakening the liquefaction of the exhaust air by the auxiliary evaporator, so as to more stably maintain the humidity of the drying room.

[0018] Tea leaves are fermented during the drying process, and the quality of the fermentation directly affects the final quality of the tea leaves. Taking white tea as an example, one of the main changes in the fermentation process of white tea is the oxidation of catechins, and volatile compounds are released during the oxidation of catechins. Catechins are beneficial to the health of drinkers and can be regarded as a direct standard for measuring the quality of white tea. Therefore, when drying white tea, it is very necessary to provide a suitable oxidation environment for catechins. A suitable environment has two rigid requirements: one is sufficient oxygen supply; the other is that volatile compounds can be discharged in time to avoid accumulating to a certain concentration and inhibiting the oxidation of catechins. Therefore, in the prior art, additional ventilation equipment is often arranged to allow the air in the drying room to exchange with the outside air periodically;

[0019] Preferably, the air exchange assembly comprises a pull rod, a push head, a lead screw and a motor, one end of the pull rod is hinged on the door panel, the push head is hinged to the other end of the pull rod, the lead screw is inserted into the push head, and the output end of the motor is connected to the lead screw;

[0020] In the above scheme, the motor drives the lead screw to rotate, so that the push head slides on the lead screw in the front-rear direction, so that the opening and closing of the door panel is controlled by the hinge of the pull rod and the door panel; when the door panel is opened inward, on the one hand, the interior of the frame is connected with the outside world, so that the outside air is sent into the drying room from the external air supply port, and the air in the drying room is discharged to the outside from the external air exhaust port, thereby realizing the exchange of air between the drying room and the outside air, so as to provide a suitable environment for the oxidation of catechins; on the other hand, the original ventilation channel inside the frame is cut off, so as to avoid wind blowback, thereby improving the efficiency of air exchange; and through the transmission of the lead screw and the push head, the pushed position can be self-locking, so that the opening and closing of the door panel are more stable.

[0021] Common ventilation equipment (similar to the air conditioner outdoor unit) often has a dust screen installed at the ventilation point to prevent foreign matter in the air from being sucked into the interior. Therefore, the present invention also has a similar arrangement on the external air outlet. However, in winter and other low temperature environments, when the equipment is changing air, moisture in the fresh air will gather on the dust screen and gradually frost, thereby blocking the dust screen and reducing the efficiency of air change.

[0022] Preferably, the defroster comprises an inlet, a discharge port and a storage port from top to bottom, the inlet is communicated with the condenser, and a second solenoid valve is installed between the inlet and the condenser, the other outlet of the second solenoid valve is directly connected to the expansion valve, and the discharge port is communicated with the expansion valve;

[0023] In the above scheme, a second solenoid valve is arranged between the condenser and the expansion valve, so that the refrigerant discharged from the condenser has two paths: one is to be discharged directly to the expansion valve, and the other is to pass through the defroster and then be discharged to the expansion valve. When the air source heat pump unit is working normally, the refrigerant flows along the former path, and when the air is changed, the refrigerant flows along the latter path, thereby avoiding frosting in extreme weather and improving the adaptability of the air source heat pump unit to the environment.

[0024] During air exchange, the defroster and the main evaporator participate in the circulation of the refrigerant together, and the pipeline through which the refrigerant flows is extended. In order to ensure the heating capacity of the air source heat pump unit during air exchange, the refrigerant in the pipeline should be replenished. Therefore, the present invention is provided with additional refrigerant inside the defroster. However, when the air exchange process is completed and the heat pump unit resumes normal operation, the refrigerant in the pipeline should maintain the original amount to avoid the negative impact of the excess refrigerant on the operation of the heat pump unit.

[0025] Preferably, the defroster is arranged below the condenser, and a one-way valve is installed between the discharge port and the expansion valve;

[0026] Through the above scheme, it is ensured that when the second solenoid valve discharges the refrigerant discharged from the condenser directly to the expansion valve, the refrigerant in the defroster will not continue to be discharged to the expansion valve due to its own gravity, thereby making the refrigerant content in the pipeline of the heat pump unit constant, and the backflow of refrigerant to the defroster is avoided by the one-way valve leading to the expansion valve.

[0027] The surface of the defroster is exposed to the outside air. When the heat pump unit is not in the air exchange state, the temperature of the high-pressure refrigerant in the defroster changes with the change of the outside temperature, which in turn affects the temperature of the pipes connected to it, thereby affecting the normal operation of the heat pump unit;

[0028] Preferably, a storage chamber is provided inside the frame, the storage chamber is located below the motor, and the storage chamber is located below the defroster, refrigerant is stored in the storage chamber, a piston is provided on the push head, the piston is inserted into the frame, and the piston slides in the storage chamber, the storage chamber is connected to the storage port, and a third solenoid valve is installed between the storage chamber and the storage port;

[0029] In the above scheme, the storage chamber in the frame is used to store extra refrigerant, and when the air exchange work starts, the third solenoid valve is turned on, and the piston is moved forward by the power of the push head to open the door panel, and then the refrigerant in the storage chamber is discharged to the defroster, so that the defroster participates in the circulation of the refrigerant; after the air exchange work is completed, the piston moves backward as the door panel is closed, and then the refrigerant in the defroster is re-sucked into the storage chamber, and because the storage chamber is connected with the defroster, the circulation space of the refrigerant becomes larger, and then the pressure of the refrigerant is reduced, and its boiling point is also reduced accordingly. The refrigerant in the storage chamber can continuously absorb the heat generated during the operation of the compressor below the storage chamber in a continuous boiling state, thereby avoiding overheating of the compressor, and when the heat pump unit is working normally, the third solenoid valve is closed, thereby eliminating the influence of the defroster temperature on the internal temperature of the compressor, so that the refrigerant in the storage chamber can dissipate heat from the compressor more stably.

[0030] Preferably, the second solenoid valve is a two-position three-way type, and the second solenoid valve is arranged close to the expansion valve, and the third solenoid valve is a two-position two-way type, and the third solenoid valve is close to the storage port;

[0031] In the above scheme, the inlet of the second solenoid valve is connected to the condenser, and the two outlets are connected to the expansion valve and the defroster respectively. When the refrigerant flowing out of the condenser switches from the defroster outlet to the expansion valve outlet, in order to avoid the pipeline process between the second solenoid valve and the expansion valve, which leads to slow pressure increase of the refrigerant in the pipeline, so that the refrigerant in the defroster still flows to the expansion valve, the second solenoid valve is arranged close to the expansion valve; the third solenoid valve controls the opening and closing of the pipeline connecting the storage chamber and the defroster. It is close to the storage port in order to cut off the influence of the defroster on the storage chamber in advance, so as to stabilize the temperature in the storage chamber and better dissipate the heat of the compressor.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The present invention is provided with a main evaporator and an auxiliary evaporator, and the main evaporator is in contact with the exhaust air of the drying room over a large area, while avoiding the auxiliary evaporator from contacting the exhaust air, so that the main evaporator and the auxiliary evaporator dry and moisturize the air respectively, so that the humidity of the drying room is rapidly reduced under the action of the main evaporator and maintained under the action of the auxiliary evaporator. The main evaporator participates in the air exchange process, so that the air containing metabolites discharged to the outside is purified under its own liquefaction. At the same time, the defroster connected to the main evaporator heats and introduces fresh air to avoid frost, so that the drying room and the outside air are normally exchanged.

[0034] 2. The present invention arranges the main evaporator and the auxiliary evaporator transversely, and arranges the ports of the main evaporator and the auxiliary evaporator connected to the expansion valve above the main evaporator and the auxiliary evaporator respectively, so that after the main evaporator and the auxiliary evaporator are switched, the refrigerant in the main evaporator or the auxiliary evaporator can flow out under the action of its own gravity to reduce the residual refrigerant. At the same time, a one-way valve is set at the ports of the main evaporator and the auxiliary evaporator connected to the compressor to avoid the backflow of the refrigerant to the main evaporator or the auxiliary evaporator, thereby ensuring the normal drying and moisturizing processes during the heating process.

[0035] 3. The present invention arranges a defroster on the external air outlet and stores refrigerant in a storage chamber. When the door panel is opened to change the air, the refrigerant in the storage chamber will flow to the defroster. The defroster and the main evaporator will participate in the circulation process of the refrigerant together, thereby heating the introduction of fresh air and purifying the exhaust air. When the door panel is closed, the high-pressure refrigerant in the defroster will return to the storage chamber in a low-pressure state, thereby utilizing the low boiling point of the refrigerant in a low-pressure state to effectively dissipate heat for the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall isometric structure of the present invention;

[0037] Figure 2 It is a schematic diagram of the overall front section and isometric structure of the present invention;

[0038] Figure 3 For the present invention Figure 2 The enlarged schematic diagram of part A in the middle;

[0039] Figure 4 For the present invention Figure 2 The enlarged schematic diagram of part B in the middle;

[0040] Figure 5 It is a schematic diagram of the overall side section isometric structure of the present invention;

[0041] Figure 6 For the present invention Figure 2 The enlarged schematic diagram of part C in the middle;

[0042] Figure 7 It is a schematic diagram of the quick-drying or moisturizing state of the present invention;

[0043] Figure 8 It is a schematic diagram of the air exchange state of the present invention.

[0044] In the figure: 1. frame; 11. internal air supply port; 12. internal air exhaust port; 121. water tank; 13. external air exhaust port; 14. external air supply port; 15. storage chamber; 2. compressor; 3. condenser; 4. fan; 5. expansion valve; 6. main evaporator; 7. auxiliary evaporator; 8. air exchange assembly; 81. pull rod; 82. push head; 821. piston; 83. screw; 84. motor; 9. defroster; 91. inlet; 92. outlet; 93. storage port; 10. first solenoid valve; 16. door panel; 17. one-way valve; 18. second solenoid valve; 19. third solenoid valve. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] See also Figures 1 to 8 The present invention provides an industrial air source heat pump unit, and the technical solution is as follows:

[0047] An industrial air source heat pump unit includes a frame 1, a compressor 2, a condenser 3, a fan 4 and an expansion valve 5. The frame 1 includes an inner air supply port 11, an inner air exhaust port 12, an outer air exhaust port 13 and an outer air supply port 14. The main body of the frame 1 is in a shell shape, and mounting plates are arranged at the lower, middle and upper parts of the shell-shaped main body respectively. The compressor 2 is mounted on the mounting plate at the lower part, and support columns are arranged at the four corners of the shell-shaped main body. The mounting plate in the middle part is mounted on the support columns, and the condenser 3, the main evaporator 6, the auxiliary evaporator 7, the fan 4, the expansion valve 5 are respectively arranged on the mounting plate in the middle part. 5. The installation position of the motor 84 and other parts, the upper installation plate covers the upper part of the shell-like body, and the upper installation plate is reserved for the connection pipes, the expansion valve 5 and the holes of the solenoid valves. The shell-like body is arranged with the inner air supply port 11, the inner air exhaust port 12, the outer air exhaust port 13 and the outer air supply port 14 in the clockwise direction. The condenser 3 is installed on the inner air supply port 11, and the fan 4 is installed behind the condenser 3. When the fan 4 is running, the air in the drying room is introduced into the heat pump unit from the inner air exhaust port 12, and the introduced air is returned to the drying room from the inner air supply port 11; refer to Figure 2 and Figure 7When the air source heat pump unit is running, the fan 4 runs to draw the air in the drying room from the inner exhaust port 12 and pass through the main evaporator 6 and the auxiliary evaporator 7. The low-pressure refrigerant in the main evaporator 6 and the auxiliary evaporator 7 has a low boiling point, so it absorbs the heat of the exhausted air to evaporate into a gaseous state (that is, the process of the heat pump obtaining low-level thermal energy from the air). The compressor 2 compresses the gaseous refrigerant in the main evaporator 6 or the auxiliary evaporator 7 into a high-pressure state and discharges it into the condenser 3. The high-pressure refrigerant in the condenser 3 has a higher boiling point under the high-pressure state, so it condenses into a liquid state after contacting the air delivered by the fan 4, and releases its own heat to heat the air delivered by the fan 4 (that is, the process of the heat pump converting high-level thermal energy). The liquid high-pressure refrigerant discharged from the condenser 3 is restored to a low-pressure state after expansion by the expansion valve 5, and its own boiling point is increased. The air pressure in the air exchanger 8 is lowered, thereby entering the main evaporator 6 or the auxiliary evaporator 7 to continue circulating, and also includes the main evaporator 6, the auxiliary evaporator 7, the air exchange component 8 and the defroster 9. The main evaporator 6 and the auxiliary evaporator 7 are both installed on the inner air outlet 12 of the frame 1, and the windward area of ​​the main evaporator 6 is larger than the windward area of ​​the auxiliary evaporator 7. The main evaporator 6 and the auxiliary evaporator 7 are both connected to the expansion valve 5, and a first solenoid valve 10 is installed between the three. The main evaporator 6 and the auxiliary evaporator 7 are both connected to the compressor 2. The outer air outlet 13 and the outer air supply outlet 14 are both provided with door panels 16. The air exchange component 8 is arranged inside the frame 1, and the air exchange component 8 is connected to two door panels 16. Refrigerant is stored inside the air exchange component 8. The defroster 9 is installed on the outer air supply outlet 14, and the defroster 9 can be connected to the condenser 3, the expansion valve 5 and the air exchange component 8.

[0048] The first solenoid valve 10 controls the expansion valve 5 to be connected with the main evaporator 6 or the auxiliary evaporator 7 to quickly dry or moisturize the room air. The air exchange component 8 pulls the door panel 16 inward to allow the fan 4 to introduce fresh air from the outside, and the air exchange component 8 passes its own stored refrigerant into the defroster 9 to avoid frost on the external air outlet 14. The main evaporator 6 participating in the air exchange uses its own large windward area to liquefy the discharged air and extract harmful substances.

[0049] As an embodiment of the present invention, refer to Figures 1 to 4 The main evaporator 6 and the auxiliary evaporator 7 are both located below the first solenoid valve 10, and the main evaporator 6 and the auxiliary evaporator 7 are arranged in a horizontal manner; the first solenoid valve 10 is a two-position three-way type, and the ends of the main evaporator 6 and the auxiliary evaporator 7 connected to the compressor 2 are both provided with a one-way valve 17, and the one-way valve 17 leads to the compressor 2; the material of the main evaporator 6 and the auxiliary evaporator 7 can be stainless steel or aluminum alloy. During manufacturing, the straight pipe and the bent pipe are first cut out separately, and then the straight pipe and the bent pipe are fixed by welding to obtain the main evaporator 6 and the auxiliary evaporator 7 respectively. After welding, the surface of the workpiece should be derusted, pickled, and polished to improve the surface finish and corrosion resistance of the workpiece. During welding, the straight pipe can be slightly tilted downward, so that the internal refrigerant can be discharged more smoothly by gravity.

[0050] As an embodiment of the present invention, refer to Figure 2 A water receiving tank 121 is provided at the inner air outlet 12, the auxiliary evaporator 7 is arranged in the water receiving tank 121, and the water receiving tank 121 is connected to the outside; the bottom surface of the water receiving tank 121 is arranged inclined, and the lower end of the inclined bottom surface is located on the side of the frame 1, and a channel is provided on the side wall in contact with the lower end of the inclined bottom surface, so that the water gathered in the water receiving tank 121 can flow to the outside, and a one-way valve 17 for outward flow is provided on the channel of the side wall to avoid interference of the external environment on the inside of the heat pump component. The water discharged from the water receiving tank 121 is liquefied from the air in the drying room, and contains metabolites in the fermentation process of tea leaves. In actual production, the discharged water can be utilized or discharged with reduced pollution according to the properties of the metabolites.

[0051] As an embodiment of the present invention, refer to Figure 2 and Figure 5 The air exchange assembly 8 includes a pull rod 81, a push head 82, a lead screw 83 and a motor 84. One end of the pull rod 81 is hinged on the door panel 16, the push head 82 is hinged to the other end of the pull rod 81, the lead screw 83 is inserted into the push head 82, and the output end of the motor 84 is connected to the lead screw 83; the two door panels 16 are hinged on the inner wall of the frame 1 through hinges to realize the opening and closing of the external exhaust port 13 and the external air supply port 14. The motor 84 has a bidirectional rotation function, so that the lead screw The bidirectional rotation of 83 drives the push head 82 to move forward and backward, and the two ends of the lead screw 83 are mounted on the frame 1 through bearings; during installation, the push head 82 is first placed inside the frame 1, and then the lead screw 83 is inserted into the frame 1 from the rear side of the frame 1 and passes through the push head 82, and then the bearings are installed at both ends of the lead screw 83 and installed on the frame 1, and then the hinges are used to complete the installation of the door panel 16, and finally the two ends of the pull rod 81 are hinged to the push head 82 and the door panel 16 respectively.

[0052] As an embodiment of the present invention, refer to Figure 5 and Figure 6The defroster 9 is arranged below the condenser 3, and the defroster 9 includes an inlet 91, an outlet 92 and a storage port 93 from top to bottom. The inlet 91 is communicated with the condenser 3, and a second solenoid valve 18 is installed between the inlet 91 and the condenser 3. The other outlet of the second solenoid valve 18 is directly connected to the expansion valve 5. The second solenoid valve 18 is a two-position three-way type, and the second solenoid valve 18 is arranged close to the expansion valve 5. The outlet 92 is communicated with the expansion valve 5, and a one-way valve 17 is installed between the outlet 92 and the expansion valve 5. , the one-way valve 17 leads to the expansion valve 5; the material selection and manufacturing method of the defroster 9 are the same as those of the main evaporator 6 and the auxiliary evaporator 7. The upper and lower transverse tubes of the defroster 9 are extended to a certain length to be inserted into the side wall of the frame 1. A groove is provided on the inner wall of the frame 1 on the left side of the external air supply port 14 to expose the port of the extended transverse tube inserted into the frame 1. The port of the upper transverse tube is the inlet 91, and the port of the lower transverse tube is connected to a one-to-two joint, and the two joints are respectively a discharge port 92 and a storage port 93.

[0053] As an embodiment of the present invention, refer to Figure 5 A storage chamber 15 is provided inside the frame 1, the storage chamber 15 is located below the motor 84, and the storage chamber 15 is located below the defroster 9, and refrigerant is stored in the storage chamber 15. A piston 821 is provided on the push head 82, the piston 821 is inserted into the frame 1, and the piston 821 slides in the storage chamber 15, the storage chamber 15 is connected with the storage port 93, and a third solenoid valve 19 is installed between the storage chamber 15 and the storage port 93, the third solenoid valve 19 is a two-position two-way type, and the third solenoid valve 19 is close to the storage port 93; storage A block is provided in front of the storage chamber 15. When installing the piston 821, the block is first removed, and then the piston 821 is pushed into the storage chamber 15 from the front side of the frame 1. The straight rod of the piston 821 is connected to the frame 1 through a linear bearing, and the linear bearing is a sealed type to ensure that the refrigerant in the storage chamber 15 will not leak out. Then the straight rod on the piston 821 is fixedly connected to the push head 82, and finally the block is installed back to the frame 1 to form a seal for the storage chamber 15. A liquid filling valve is provided on the block to allow additional refrigerant to pass into the storage chamber 15.

[0054] Working principle: In order to avoid the phenomenon that the evaporator in the air source heat pump unit continues to dry the air after rapidly reducing the humidity in the drying room, thereby causing the humidity of the tea drying environment to be too low, affecting the fermentation of the tea leaves, and thus reducing the quality of the tea leaves, the present invention makes improvements to the evaporator, and changes the original single evaporator into two, namely the main evaporator 6 and the auxiliary evaporator 7. The main evaporator 6 rapidly reduces the air humidity in the drying room by virtue of its large windward area, and the auxiliary evaporator 7 avoids contact with the exhaust air, thereby moisturizing the air in the drying room; and the present invention has a ventilation function to ensure that the drying room has sufficient oxygen, and timely discharges the volatile compounds generated during the fermentation of the tea leaves, so as to provide a suitable oxidation environment for the tea leaves being dried, thereby ensuring the quality of the tea leaves; and while changing the air, the present invention can not only use the waste heat of the condenser 3 to effectively heat the air inlet, thereby avoiding frost on the air inlet, but also can communicate with the main evaporator 6 to make the air in the drying room be liquefied in large quantities when discharged, thereby achieving a purification effect;

[0055] Specifically, in order to switch the refrigerant between the main evaporator 6 and the auxiliary evaporator 7, a first solenoid valve 10 is arranged between the main evaporator 6, the auxiliary evaporator 7 and the expansion valve 5. The inlet of the first solenoid valve 10 is connected to the expansion valve 5, and the two outlets are connected to the main evaporator 6 and the auxiliary evaporator 7 respectively, so that the refrigerant discharged from the expansion valve 5 is passed to the main evaporator 6 or the auxiliary evaporator 7 by the replacement of the valve core inside the solenoid valve;

[0056] In order to enable the main evaporator 6 and the auxiliary evaporator 7 to discharge the refrigerant inside themselves when they are not involved in the refrigerant cycle, so that the refrigerant in the pipeline of the heat pump unit can fully participate in the circulation to ensure the heating efficiency of the unit, the main evaporator 6 and the auxiliary evaporator 7 are both located below the first solenoid valve 10, and the main evaporator 6 and the auxiliary evaporator 7 are arranged in a transverse pipe, which ensures that when the first solenoid valve 10 works to change the circulation state of the refrigerant (switching between the main evaporator 6 and the auxiliary evaporator 7), the main evaporator 6 or the auxiliary evaporator 7 that is not involved in the refrigerant cycle can discharge the refrigerant inside itself along the pipe of the transverse pipe. The refrigerant is discharged through the main evaporator 6, so that the refrigerant can participate in the circulation completely to avoid affecting the working efficiency of the air source heat pump unit. When the auxiliary evaporator 7 participates in the circulation, the main evaporator 6 discharges the internal refrigerant, which can gradually heat up its own surface, thereby avoiding the liquefaction of the discharged air, thereby achieving a better moisturizing effect. In addition, a one-way valve 17 is arranged at the end of the main evaporator 6 and the auxiliary evaporator 7 connected to the compressor 2 to prevent the refrigerant in the main evaporator 6 or the auxiliary evaporator 7 from flowing back to the auxiliary evaporator 7 or the main evaporator 6 when flowing to the compressor 2, thereby ensuring the working efficiency of the air source heat pump unit.

[0057] In order to exchange air between the drying room and the outside, the motor 84 drives the lead screw 83 to rotate, so that the push head 82 slides on the lead screw 83 in the front-back direction, thereby controlling the opening and closing of the door panel 16 through the hinge connection between the pull rod 81 and the door panel 16; Figure 8 When the door panel 16 is opened inward, on the one hand, the interior of the frame 1 is connected with the outside, so that the outside air is sent into the drying room from the external air supply port 14, and the air in the drying room is discharged to the outside from the external air exhaust port 13, thereby realizing the exchange of air between the drying room and the outside; on the other hand, the original ventilation channel inside the frame 1 is blocked, thereby avoiding wind leakage, thereby improving the efficiency of air exchange; and through the transmission of the lead screw 83 and the push head 82, the pushed position can be self-locking, so that the opening and closing of the door panel 16 are more stable;

[0058] In order to avoid frosting during air exchange, a second solenoid valve 18 is provided between the condenser 3 and the expansion valve 5, so that the refrigerant discharged from the condenser 3 has two paths: one is to be discharged directly to the expansion valve 5, and the other is to be discharged to the expansion valve 5 after passing through the defroster 9. When the air source heat pump unit is working normally, the refrigerant flows along the former path, and when the air is exchanged, the refrigerant flows along the latter path, thereby avoiding frosting in extreme weather and improving the adaptability of the air source heat pump unit to the environment.

[0059] In order to prevent the temperature of the high-pressure refrigerant in the defroster 9 from changing with the outside temperature, thereby affecting the temperature of the pipe connected to the defroster 9 and thus affecting the normal operation of the heat pump unit, the storage chamber 15 in the frame 1 is used to store extra refrigerant, and at the beginning of the air exchange operation, the third solenoid valve 19 is turned on, and the piston 821 moves forward with the power of the push head 82 to open the door plate 16, thereby discharging the refrigerant in the storage chamber 15 to the defroster 9, so that the defroster 9 participates in the circulation of the refrigerant; after the air exchange operation is completed, the piston 821 moves backward with the closing of the door plate 16, thereby discharging the refrigerant in the storage chamber 15 to the defroster 9, The refrigerant in the defroster 9 is re-sucked into the storage chamber 15, and due to the connection between the storage chamber 15 and the defroster 9, the circulation space of the refrigerant becomes larger, thereby reducing the pressure of the refrigerant and its boiling point. The refrigerant in the storage chamber 15 can continuously absorb the heat generated during the operation of the compressor 2 below the storage chamber 15 in a continuous boiling state, thereby avoiding overheating of the compressor 2, and when the heat pump unit is working normally, the third solenoid valve 19 is closed, thereby eliminating the influence of the temperature of the defroster 9 on the internal temperature of the compressor 2, so that the refrigerant in the storage chamber 15 can dissipate heat from the compressor 2 more stably.

[0060] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An industrial air source heat pump unit, comprising a frame (1), a compressor (2), a condenser (3), a fan (4) and an expansion valve (5), wherein the frame (1) comprises an inner air supply port (11), an inner air exhaust port (12), an outer air exhaust port (13) and an outer air supply port (14), characterized in that: It also includes a main evaporator (6), an auxiliary evaporator (7), an air exchange assembly (8) and a defroster (9); the main evaporator (6) and the auxiliary evaporator (7) are both mounted on the inner air outlet (12) of the frame (1); the windward area of ​​the main evaporator (6) is larger than the windward area of ​​the auxiliary evaporator (7); a first solenoid valve (10) is mounted between the main evaporator (6), the auxiliary evaporator (7) and the expansion valve (5); door panels (16) are arranged on the outer air outlet (13) and the outer air supply outlet (14); the air exchange assembly (8) is arranged inside the frame (1), and the air exchange assembly (8) is connected to two door panels (16); refrigerant is stored inside the air exchange assembly (8); and the defroster (9) is mounted on the outer air supply outlet (14); The first solenoid valve (10) controls the expansion valve (5) to communicate with the main evaporator (6) or the auxiliary evaporator (7) to quickly dry or moisturize the room air, the air exchange component (8) pulls the door panel (16) inward to allow the fan (4) to introduce fresh air from the outside, and the air exchange component (8) passes its own stored refrigerant into the defroster (9) to avoid frost on the external air outlet (14), and the main evaporator (6) involved in the air exchange liquefies the discharged air by virtue of its large windward area to extract harmful substances.

2. An industrial air source heat pump unit according to claim 1, characterized in that: The main evaporator (6) and the auxiliary evaporator (7) are both located below the first solenoid valve (10), and the main evaporator (6) and the auxiliary evaporator (7) are arranged in a transverse arrangement.

3. An industrial air source heat pump unit according to claim 2, characterized in that: The first solenoid valve (10) is of a two-position three-way type, and the ends of the main evaporator (6) and the auxiliary evaporator (7) connected to the compressor (2) are both provided with a one-way valve (17), and the one-way valve (17) leads to the compressor (2).

4. An industrial air source heat pump unit according to claim 2, characterized in that: A water receiving groove (121) is provided at the inner air outlet (12), the auxiliary evaporator (7) is arranged in the water receiving groove (121), and the water receiving groove (121) is in communication with the outside.

5. The industrial air source heat pump unit according to claim 1, characterized in that: The air exchange assembly (8) comprises a pull rod (81), a push head (82), a lead screw (83) and a motor (84); one end of the pull rod (81) is hinged on the door panel (16); the push head (82) is hinged to the other end of the pull rod (81); the lead screw (83) is inserted into the push head (82); and the output end of the motor (84) is connected to the lead screw (83).

6. An industrial air source heat pump unit according to claim 5, characterized in that: The defroster (9) comprises, from top to bottom, an inlet (91), an outlet (92) and a storage port (93); the inlet (91) is connected to the condenser (3); and a second solenoid valve (18) is installed between the inlet (91) and the condenser (3); the other outlet of the second solenoid valve (18) is directly connected to the expansion valve (5); and the outlet (92) is connected to the expansion valve (5).

7. An industrial air source heat pump unit according to claim 6, characterized in that: The defroster (9) is arranged below the condenser (3), and a one-way valve (17) is installed between the discharge port (92) and the expansion valve (5).

8. An industrial air source heat pump unit according to claim 7, characterized in that: A storage chamber (15) is arranged inside the frame (1), the storage chamber (15) is located below the motor (84), and the storage chamber (15) is located below the defroster (9), refrigerant is stored in the storage chamber (15), a piston (821) is arranged on the push head (82), the piston (821) is inserted into the frame (1), and the piston (821) slides in the storage chamber (15), the storage chamber (15) is connected to the storage port (93), and a third solenoid valve (19) is installed between the storage chamber (15) and the storage port (93).

9. An industrial air source heat pump unit according to claim 8, characterized in that: The second solenoid valve (18) is of a two-position three-way type, and the second solenoid valve (18) is arranged closely to the expansion valve (5), and the third solenoid valve (19) is of a two-position two-way type, and the third solenoid valve (19) is close to the storage port (93).

Images