Heat pump drying module and method

Abstract

The heat pump drying module comprises a shell, an air duct is formed in the shell, an evaporator and a main condenser are installed in the air duct, the evaporator is close to an air inlet of the air duct, and the main condenser is close to an air outlet of the air duct; an auxiliary heat exchanger II is further arranged in the air channel and located on the side, facing the air inlet, of the evaporator, the auxiliary heat exchange flow channel comprises a heat exchange pipe II and a plurality of auxiliary heat exchange pieces II, the auxiliary heat exchange pieces II are installed outside the heat exchange pipe II, the auxiliary heat exchanger further comprises an auxiliary condenser, and the auxiliary condenser is located in the heat exchange pipe II and located on the side, facing the air inlet, of the evaporator. The two ends of the second heat exchange pipe are connected into the auxiliary heat exchange flow channel, and heat of the auxiliary condenser can be taken away from the auxiliary heat exchange flow channel through air circulation of the auxiliary heat exchange flow channel. The dehydration efficiency of the whole drying system can be improved, and integration of equipment is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to a heat pump drying device, more particularly, to a heat pump drying module and a heat pump drying method. BACKGROUND

[0002] The heat pump drying system drives the circulation of refrigerant through the heat pump, so that the condensate can flow through the condenser and the evaporator, and a relatively high temperature state can be formed at the condenser, and a relatively low temperature state can be formed at the evaporator. In the process of air flowing through, the water in the air is pre-cooled and separated out to achieve dehydration after the air is cooled by the evaporator, and then the air is heated by the condenser to achieve the effect of drying and dehydration by using the cold and hot changes of the air.

[0003] When the ambient temperature is low, the entire system is in a relatively low temperature state, and the temperature difference in the circulating flow process of the air is low, resulting in low initial drying efficiency of the equipment and affecting the dehydration efficiency of the drying system.

[0004] Therefore, a new scheme is needed to solve this problem. SUMMARY

[0005] The present application aims to overcome the shortcomings of the prior art and provide a heat pump drying module and method.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: a heat pump drying module, comprising a shell, a wind channel is formed in the shell, an evaporator and a main condenser are installed in the wind channel, the evaporator is close to the air inlet of the wind channel, and the main condenser is close to the air outlet of the wind channel; a second auxiliary heat exchanger is further arranged in the wind channel, the second auxiliary heat exchanger is located on the side of the evaporator facing the air inlet, the auxiliary heat exchanger includes a second heat exchange pipe and a plurality of second auxiliary heat exchange fins, the second auxiliary heat exchange fins are installed outside the second heat exchange pipe, and a secondary condenser is further included, the secondary condenser is located in the second heat exchange pipe, and the two ends of the second heat exchange pipe are connected to the auxiliary heat exchange flow channel, so that the heat of the secondary condenser can be taken away by the air flowing through the auxiliary heat exchange flow channel.

[0007] The present application is further provided with a first auxiliary heat exchanger arranged in the wind channel, the first auxiliary heat exchanger is installed between the evaporator and the main condenser, the first auxiliary heat exchanger and the second auxiliary heat exchanger are communicated through the auxiliary heat exchange flow channel, and air flow exchange is realized between the first auxiliary heat exchanger and the second auxiliary heat exchanger.

[0008] The present application is further provided with a first auxiliary heat exchanger arranged in the wind channel, the first auxiliary heat exchanger is installed between the evaporator and the main condenser, the first auxiliary heat exchanger and the second auxiliary heat exchanger are communicated through the auxiliary heat exchange flow channel, and air flow exchange is realized between the first auxiliary heat exchanger and the second auxiliary heat exchanger.

[0009] The present invention is further configured such that the auxiliary heat exchange channel includes a first air duct, a second air duct, and a third air duct; the first air duct connects the air duct and the first end of the first heat exchange tube; the second air duct connects the second end of the first heat exchange tube and the first end of the second heat exchange tube; and the third air duct connects the second end of the second heat exchange tube and the air duct; a fan is installed inside the first air duct.

[0010] The present invention is further configured such that an extension cavity facing away from the air outlet is formed at a position of the air duct near the air inlet; the extension cavity is connected to the air inlet through an opening.

[0011] The present invention is further configured such that the outer wall of the extension cavity is provided with interface one and interface two, the air guide pipe one is connected to interface one, and the air guide pipe three is connected to interface two.

[0012] The present invention is further configured such that an opening two is provided on the side of the extension cavity opposite to the opening one, and a sealing cover is provided inside the extension cavity. The sealing cover is driven by a telescopic rod to close either the opening one or the opening two.

[0013] The present invention is further configured such that the auxiliary heat exchange channel also includes a fourth air guide pipe, and the fourth air guide pipe, the third air guide pipe and the second heat exchange pipe are connected by a tee joint; the air duct is provided with an interface three on the outside of the air outlet, and the fourth air guide pipe is connected to the interface three.

[0014] The present invention is further configured such that the third air duct is equipped with a damper, and the fourth air duct is equipped with a damper.

[0015] The present invention is further configured such that the air duct is arranged from top to bottom, the air outlet and the air inlet are located on the upper and lower sides of the shell respectively, and the evaporator is located below the main condenser and directly above the auxiliary condenser.

[0016] The present invention also provides a heat pump drying method, which uses the heat pump drying module as described above.

[0017] In summary, the present invention has the following beneficial effects:

[0018] By setting up auxiliary heat exchanger one and auxiliary condenser, the temperature of the hot air can be raised first, and then it passes through the evaporator. The temperature difference between the heated air and the evaporator will be greater, which can improve the condensation and dehydration effect at the evaporator, thereby improving the drying and dehydration efficiency of the entire drying system. Attached Figure Description

[0019] Figure 1 This is a partial structural schematic diagram of the heat pump drying module in Example 1;

[0020] Figure 2 This is a schematic diagram of the internal structure of the heat pump drying module housing in Example 1;

[0021] Figure 3 This is a schematic diagram of the second state of the heat pump drying module in Embodiment 2;

[0022] Figure 4 This is a schematic diagram of the third state of the heat pump drying module in Example 2;

[0023] Figure 5 This is a schematic diagram of the structure of the heat pump drying module in one state in Embodiment 3;

[0024] Figure 6 This is a schematic diagram of another state of the heat pump drying module in Embodiment 3;

[0025] Figure 7 This is a schematic diagram of the heat pump drying module in Example 4.

[0026] Reference numerals: Shell 1; Air duct 101; Extension cavity 1011; Opening 1 1012; Opening 2 1013; Telescopic rod 1014; Closed cover 1015; Air inlet 102; Air outlet 103; Interface 1 104; Interface 2 105; Interface 3 106; Evaporator 2; Main condenser 3; Auxiliary condenser 4; Auxiliary heat exchanger 5; Auxiliary heat exchange plate 500; Heat exchange tube 501; 503 elbow; 504 drain pipe; 6 auxiliary heat exchanger 2; 600 auxiliary heat exchange fin 2; 601 heat exchange tube 2; 7 auxiliary heat exchange flow channel; 710 air duct 1; 711 fan; 712 damper 4; 720 air duct 2; 730 air duct 3; 731 damper 1; 740 air duct 4; 741 damper 2; 750 tee joint; 760 air duct 5; 761 damper 3; 8 compressor pump. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1

[0029] This embodiment discloses a heat pump drying module, referring to... Figure 1 , Figure 2As shown, the module includes a housing 1, which serves as a support for all components of the heat pump drying module, allowing for integrated installation of the entire module. The heat pump drying module mainly includes a compressor pump 8, an evaporator 2, a main condenser 3, a throttling element, and refrigerant circulation piping, all of which are integrated into the housing 1. The specific installation structure of each component is designed according to its shape and structure.

[0030] Reference Figure 2 As shown, an air duct 101 is formed inside the housing 1. An evaporator 2 and a main condenser 3 are installed inside the air duct 101. The evaporator 2 is located near the air inlet 102 of the air duct 101, and the main condenser 3 is located near the air outlet 103 of the air duct 101. During operation, a fan device can create airflow circulation between the air duct 101 and the drying chamber, that is, the fan can deliver air into the air duct 101, and the airflow direction is from the air inlet 102 to the air outlet 103.

[0031] The air in the drying chamber is first cooled by the evaporator 2. After the air comes into contact with the evaporator 2 for pre-cooling, it is condensed and dehydrated. Then the air is heated by the main condenser 3 and then enters the drying chamber to heat it. The air circulates through the air duct 101 to dry the drying chamber.

[0032] Example 2

[0033] This embodiment discloses a heat pump drying module, which is based on Embodiment 1 and further refers to... Figure 3 Please provide a detailed explanation.

[0034] In this embodiment, the heat pump drying module also includes an auxiliary heat exchanger 5 and an auxiliary heat exchanger 6, wherein the auxiliary heat exchanger 5 is installed between the evaporator 2 and the main condenser 3, and the auxiliary heat exchanger 6 is located on the side of the evaporator 2 facing the air inlet 102.

[0035] Specifically, the auxiliary heat exchanger 5 includes a heat exchange tube 501 and several auxiliary heat exchange fins 500. Both ends of the heat exchange tube 501 extend out of the shell 1 and are connected to the auxiliary heat exchange flow channel 7. An air passage can be formed inside the heat exchange tube 501. The auxiliary heat exchange fins 500 are installed outside the heat exchange tube 501, and each auxiliary heat exchange fin 500 is arranged in parallel, forming a fin-like structure outside the tube to increase the heat exchange surface area on the outside. In order to extend the flow channel length of the heat exchange tube 501, the heat exchange tube 501 can be set in a U-shaped structure to extend the flow time of air circulation.

[0036] Auxiliary heat exchanger 26 includes heat exchange tube 2601 and several auxiliary heat exchange fins 2600. The heat exchange tube 2601 forms a channel for air circulation. The auxiliary heat exchange fins 2600 are installed outside the heat exchange tube 2601, and are evenly distributed to form a fin-like structure. This allows for normal air circulation within the air duct 101 and also increases the heat exchange area. Both ends of the heat exchange tube 2601 extend out of the shell 1 and connect to the auxiliary heat exchange channel 7, enabling air circulation between the heat exchange tube 1501 and the heat exchange tube 2601.

[0037] In addition, the heat pump drying module also includes a secondary condenser 4, which is also connected to the refrigerant circulation pipeline and can be connected in series with the main condenser 3; furthermore, the secondary condenser 4 can be connected in series downstream of the main condenser 3. After compression by the compressor pump 8, a high-temperature and high-pressure refrigerant is formed, which then flows sequentially through the main condenser 3 and the secondary condenser 4. Through the fins of the corresponding condensers, the heat of the refrigerant can be dissipated outward; and since the main condenser 3 is located upstream of the secondary condenser 4, the refrigerant flows through the main condenser 3 first, so the temperature at the main condenser 3 will be higher than the temperature at the secondary condenser 4.

[0038] Reference Figure 3 As shown, the auxiliary condenser 4 is installed inside the heat exchange tube 601 of the auxiliary heat exchanger 6. The heat exchange tube 601 has a larger internal cavity than the heat exchange tube 501, allowing the auxiliary condenser 4 to be housed within it. When the auxiliary condenser 4 is in operation, it releases heat within the heat exchange tube 601, which is then transferred to the air duct 101 outside the auxiliary heat exchanger 6 via the heat exchange fins 600 outside the heat exchange tube 601. This preheating of the air occurs upstream of the evaporator 2 in the air duct 101.

[0039] The temperature of the hot air is first raised by the auxiliary heat exchanger 6 and the auxiliary condenser 4, and then it passes through the evaporator 2. The temperature difference between the heated air and the evaporator 2 will be greater, which can improve the condensation and dehydration effect at the evaporator 2. Then, the air passes through the main condenser 3, which heats up the cooled and dehydrated air and enters the circulation process.

[0040] In addition, the heat exchange tube 601 of the auxiliary heat exchanger 6 is connected to the auxiliary heat exchange channel 7. Through the air circulation in the auxiliary heat exchange channel 7, some of the heat released by the auxiliary condenser 4 in the heat exchange tube 601 can be carried away, and heat exchange can be achieved with the help of the heat of the auxiliary condenser 4, forming different drying working states.

[0041] Reference Figure 3As shown, an extension cavity 1011 is formed in the air duct 101 near the air inlet 102, facing away from the air outlet 103. The extension cavity 1011 is connected to the air inlet 102 through an opening 1012. Furthermore, an interface 104 and an interface 105 are provided on the outer wall of the extension cavity 1011. The opening 1012 connects the interface 104 and the interface 105, allowing the air from the air inlet 102 to communicate with the flow channel of the auxiliary heat exchanger duct 7.

[0042] The auxiliary heat exchange channel 7 includes a first air duct 710, a second air duct 720, and a third air duct 730; the first air duct 710 connects the first interface 104 of the air duct 101 to the first end of the first heat exchange tube 501, the second air duct 720 connects the second end of the first heat exchange tube 501 to the first end of the second heat exchange tube 601, and the third air duct 730 connects the second end of the second heat exchange tube 601 to the second interface 105 of the air duct 101.

[0043] A fan 711 is installed inside the air duct 710. This fan 711 delivers air through the air duct 710. When the fan 711 rotates forward, refer to... Figure 3 As shown, the air evacuated from the extension cavity 1011 enters the air duct 710, which is the auxiliary heat exchange channel 7, and flows through the heat exchange tube 501 and the heat exchange tube 601 in sequence. When the fan 711 reverses, the air flows in the opposite direction in the auxiliary heat exchange channel 7. The air will first pass through the heat exchange tube 601, then through the heat exchange tube 501, and finally enter the extension cavity 1011 from the air duct 710.

[0044] Each section of the air duct and the heat exchange tube form a connected airflow channel, namely forming a flow channel of interface 104, air duct 710, the first end of heat exchange tube 501, the second end of heat exchange tube 501, air duct 720, the first end of heat exchange tube 601, the second end of heat exchange tube 601, air duct 730, and interface 105. This allows for flow between the extension cavity 1011 of the air duct 101 and the auxiliary heat exchanger 5 and the auxiliary heat exchanger 6, and can achieve corresponding heat exchange effects according to different states.

[0045] During equipment operation, airflow is formed in the air duct 101 from the air inlet 102 to the air outlet 103. The air first passes through the auxiliary heat exchanger 2 6. Since the auxiliary heat exchanger 2 6 is equipped with the auxiliary condenser 4, the heat of the auxiliary condenser 4 can be transferred to the outside of the auxiliary heat exchanger 2 6, which can preheat the air flowing through the auxiliary heat exchanger 2 6. Then it passes through the evaporator 2 for cooling and temperature reduction, which can increase the relative temperature difference of heat exchange near the evaporator 2 and improve the dehydration efficiency. Then it passes through the main condenser 3 for supplementary heating and enters the drying chamber.

[0046] In the first state, the fan 711 can be off, and no auxiliary heat exchange occurs between auxiliary heat exchanger 5 and auxiliary heat exchanger 6. This state is suitable for the initial stage of drying. At this time, the humidity in the drying chamber is high, but the temperature is low. When passing through evaporator 2, the temperature difference is relatively small, and the dehydration efficiency is also reduced. Preheating through auxiliary heat exchanger 6 and auxiliary condenser 4 can increase the relative temperature difference during dehydration near evaporator 2, thereby improving the dehydration efficiency. This working state is particularly suitable for the initial stage of drying.

[0047] Temperature sensor 1 is installed at air inlet 102 to detect the air temperature at air inlet 102; temperature sensor 2 is installed between evaporator 2 and main condenser 3 to detect the air temperature after it has been cooled by evaporator 2.

[0048] When the air temperature downstream of evaporator 2 (i.e. the temperature detected by temperature sensor 2) is lower than the temperature at air inlet 102 (i.e. the temperature detected by temperature sensor 1), it indicates that there is still a certain temperature difference between the air downstream of evaporator 2 and the air at air inlet 102, and part of the cooling capacity of evaporator 2 is not fully utilized.

[0049] At this point, the system is adjusted to the second state, and the fan can rotate forward. The fan 711 can draw air from the extension chamber 1011, i.e., the area near the air inlet 102, into the auxiliary heat exchange channel 7. The air first passes through auxiliary heat exchanger 5, then through auxiliary heat exchanger 6, where it receives heat from the auxiliary condenser. Finally, the air is circulated and discharged from the interface 105 to the air inlet 102 of the duct 101. The air in the auxiliary heat exchange channel 7 first passes through auxiliary heat exchanger 5 downstream of the evaporator 2. The air in the duct 101 is cooled by the evaporator 2 and then comes into contact with auxiliary heat exchanger 5 for heat exchange. At auxiliary heat exchanger 5, the air temperature in the heat exchange tube 501 is relatively high. Pre-cooling in auxiliary heat exchanger 5 results in condensation and dehydration within the heat exchange tube 501, supplementing the cooling capacity downstream of the evaporator 2 and improving dehydration efficiency.

[0050] When the air temperature downstream of evaporator 2 (i.e. the temperature detected by temperature sensor 2) is not higher than the temperature at air inlet 102 (i.e. the temperature detected by temperature sensor 1), if it is operated in the second state, at auxiliary heat exchanger 5, the temperature on the outside is slightly higher than the temperature on the inside, and condensation cannot be formed in heat exchange tube 501.

[0051] At this time, when adjusted to the third state, the fan can work in reverse. The fan 711 can draw air from near the air inlet 102 and enter the air duct 730 from the interface 105. It is first heated by the auxiliary heat exchanger 6. After heating, the temperature of the air flowing in the auxiliary heat exchange channel 7 will be higher than the air temperature downstream of the evaporator 2 (i.e., the temperature detected by the temperature sensor 2). When the air in the auxiliary heat exchange channel 7 flows to the auxiliary heat exchanger 5, it will again form a state where the air temperature in the heat exchange tube 501 is relatively high. After pre-cooling in the auxiliary heat exchanger 5, a certain condensation and dehydration effect will be formed in the heat exchange tube 501, which can supplement the cooling capacity downstream of the evaporator 2 and improve the dehydration efficiency.

[0052] By configuring the auxiliary heat exchange channel 7, the cooling capacity generated by the evaporator 2 can be utilized more effectively with the help of the auxiliary heat exchanger 5 downstream of the evaporator 2, thereby improving the dehydration efficiency of the entire heat pump system. Water accumulated during dehydration within the auxiliary heat exchange channel 7 and the air duct 101 can extend through the corresponding pipe or air duct into the extension chamber 1011 and be discharged from the opening 1013 at the bottom of the extension chamber 1011. During operation, the opening 1013 can be opened periodically to allow for water drainage.

[0053] Furthermore, in the heat pump drying module of this embodiment, an opening 1013 is provided on the side of the extension cavity 1011 opposite to the opening 1012, and the opening 1013 is in communication with the external environment; the opening 1012 and the opening 1013 are arranged opposite to each other, and a sealing cover 1015 is installed in the extension cavity 1011. The sealing cover 1015 can reciprocate between the opening 1012 and the opening 1013 and can be driven by the telescopic rod 1014.

[0054] When the telescopic rod 1014 causes the closed cover 1015 to abut against the second opening 1013, the second opening 1013 will be closed, the closed cover 1015 will separate from the first opening 1012, and the first opening 1012 will be opened, forming a state where the extension cavity 1011, the first opening 1012, and the air inlet 102 are connected. The extension cavity 1011 is connected to the drying chamber but disconnected from the outside space. In this state, the air circulated in the auxiliary heat exchange channel 7 is the air in the drying chamber. The auxiliary heat exchange channel 7 can replenish and circulate the air in the auxiliary heat exchange channel 7, improving the dehydration effect.

[0055] Conversely, when the telescopic rod 1014 drives the closed cover 1015 to abut against the opening 1012, the opening 1012 will be closed, the closed cover 1015 will separate from the opening 1013, and the opening 1013 will be opened, forming a state where the extension cavity 1011, the opening 1013, and the external environment are connected. The extension cavity 101 is disconnected from the drying chamber and connected to the external environment. In this state, the air circulating in the auxiliary heat exchange channel 7 is the air from the external environment. When the temperature in the drying chamber is too high, cooler air can be introduced into the auxiliary heat exchange channel 7 to supplement and cool the air circulating in the drying chamber. This can prevent the air circulating in the drying chamber and the air duct 101 from being too hot, which would affect the normal operation of the refrigerant circulation system. Moreover, for the auxiliary condenser 4, the air flowing on its surface is the outside air. Through circulation, the heat of the auxiliary condenser 4 can be carried away, which can prevent the refrigerant circulation temperature from being too high, thus ensuring that the evaporator can cool down normally.

[0056] Heat dissipation can be achieved through air circulation between the extension cavity 1011 and the external environment. Alternatively, a fan can be installed on the outside of the opening 1013 of the extension cavity 1011 to accelerate air circulation between the extension cavity 1011 and the external environment, thereby accelerating heat dissipation.

[0057] This embodiment also discloses a heat pump drying method, which uses the heat pump drying module as described above, and can switch between different operating states according to operating parameters.

[0058] Example 3

[0059] This embodiment discloses a heat pump drying module, which is based on Embodiment 2 and further refers to... Figure 5 , Figure 6 Please provide a detailed explanation.

[0060] In this embodiment, the auxiliary heat exchange channel 7 also includes a fourth air duct 740, wherein the fourth air duct 740, the third air duct 730 and the second heat exchange tube 601 are connected by a tee joint 750, and two branches are formed at one end of the second heat exchange tube 601, namely the fourth air duct 740 and the third air duct 730.

[0061] Furthermore, an interface 3 106 is provided on the outside of the air outlet 103 in the air duct 101, and the air guide pipe 4 740 is connected to the interface 3 106, that is, the heat exchange pipe 2 601 and the interface 3 106 can be connected through the air guide pipe 4 740.

[0062] Air damper 731 is installed in air duct 3 730, which can control the opening and closing of air duct 3 730; air damper 741 is installed in air duct 4 740, which can control the opening and closing of air duct 4 740.

[0063] During equipment operation, when the air temperature in the drying space rises to a certain upper limit, the temperature of the air circulating in the air duct 101 will also increase; at this time, there is a margin for the heat generated by the main condenser 3 and the auxiliary condenser 4.

[0064] At this time, the system is adjusted to the fourth state, controlling damper 731 to be cut off, damper 741 to be opened, and fan 711 to be rotated forward. During operation, fan 711 will draw a portion of the air volume from the air inlet 102. The air from the air inlet 102 passes through the auxiliary heat exchange channel 7, is cooled and dehydrated by the auxiliary heat exchanger 5, is heated by the auxiliary heat exchanger 6, and finally enters the air outlet 103 directly from the air duct 740. From the air outlet 103 of the air duct 101, some of the air in the auxiliary heat exchange channel 7 will not flow directly through the main condenser 3, thereby reducing the heat loss from the main condenser 3 and thus mitigating the excessively high temperature in the drying space to a certain extent.

[0065] When the temperature in the drying chamber is too high, the operating status of the equipment can be further adjusted. The auxiliary heat exchange channel 7 operates in the fourth state mentioned above. At the same time, the closed cover 1015 is adjusted so that the opening 1012 is closed and the opening 2 1013 is opened. The extension chamber 1011 can be connected to the external environment through the opening 2 1013. The air drawn from the extension chamber 1011 by the fan 711 is the air of the external environment. Since the temperature of the air in the external environment is lower, it can flow through each section of the auxiliary heat exchange channel 7 and finally enter the air outlet 103 of the air duct 101 from the interface 3 106, which can appropriately reduce the temperature in the drying chamber.

[0066] The equipment continuously operates in the fourth state and switches the opening and closing states of opening one 1012 and opening two 1013. In this way, on the one hand, air can be directly introduced into the drying chamber to appropriately reduce the drying temperature, and on the other hand, the heat in the auxiliary condenser can be directly dissipated to the external environment. Through the cooperation of multiple states, heat dissipation in the drying chamber and refrigerant circulation path can be achieved.

[0067] To maintain pressure balance within the drying chamber, a connecting valve can be installed in the drying chamber. By opening the valve, the internal and external air pressures are kept balanced, allowing outside air to be introduced into the drying chamber normally and stably.

[0068] Furthermore, in this embodiment, the air duct 101 is arranged from top to bottom, with the air outlet 103 and air inlet 102 located on the upper and lower sides of the housing 1, respectively. The evaporator 2 is located below the main condenser 3 and directly above the auxiliary condenser 4. During the drying and dehydration process, condensate will condense on the surface of the evaporator 2. The condensate at the evaporator 2 can flow from top to bottom due to gravity, and some of the condensate will adhere to the surface of the auxiliary condenser 4. The relatively low temperature of the condensate itself cools the surface of the auxiliary condenser 4. The low temperature of the condensate can, to some extent, counteract the heat of the auxiliary condenser 4, preventing excessively high temperatures during the later drying process.

[0069] Example 4

[0070] This embodiment discloses a heat pump drying module, which is based on Embodiment 2 and further refers to... Figure 7 Please provide a detailed explanation.

[0071] In this embodiment, the auxiliary heat exchange channel 7 also includes a fifth air duct 760, which is connected to the first air duct 710 and the second air duct 720 via a tee connection. A third damper 761 is installed on the fifth air duct 760. A fourth damper 712 is installed on the second air duct 720, located between the fifth air duct 760 and the first heat exchange tube 501.

[0072] By controlling the on / off states of damper three 761 and damper four 712, the flow path of auxiliary heat exchanger channel 7 can be switched. Under normal conditions, damper three 761 is in the open state and damper four 712 is in the closed state, enabling various flow states as described in the above embodiments.

[0073] When the refrigerant temperature and the drying chamber temperature of the entire drying system both reach the set upper limit, it indicates that the heat dissipation of the entire system is too high, and forced cooling is required. At this time, control damper three 761 to be closed and damper four 712 to be open, which can isolate auxiliary heat exchanger one 5 outside the circulation channel of auxiliary heat exchange channel 7; then control opening one 1012 to be closed and opening two 1013 to be opened; then, through the air circulation in auxiliary heat exchange channel 7, the heat of auxiliary condenser 4 can be dissipated to the outside space, and the cooling capacity generated by evaporator 2 can be prevented from being carried away during the circulation of auxiliary heat exchange channel 7, so as to achieve efficient heat dissipation of the entire system to the external environment.

[0074] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A heat pump drying module, characterized in that, The device includes a housing (1), within which an air duct (101) is formed. An evaporator (2) and a main condenser (3) are installed within the air duct (101). The evaporator (2) is located near the air inlet (102) of the air duct (101), and the main condenser (3) is located near the air outlet (103) of the air duct (101). An auxiliary heat exchanger (6) is also provided within the air duct (101), located on the side of the evaporator (2) facing the air inlet (102). The auxiliary heat exchange channel (7) includes a second heat exchange tube (601) and several second auxiliary heat exchange plates (600). The second auxiliary heat exchange plates (600) are installed outside the second heat exchange tube (601). It also includes a secondary condenser (4). The secondary condenser (4) is located inside the second heat exchange tube (601). Both ends of the second heat exchange tube (601) are connected to the auxiliary heat exchange channel (7). The heat of the secondary condenser (4) can be carried away from the auxiliary heat exchange channel (7) through the air flow of the auxiliary heat exchange channel (7).

2. The heat pump drying module according to claim 1, characterized in that, An auxiliary heat exchanger (5) is also provided in the air duct (101). The auxiliary heat exchanger (5) is installed between the evaporator (2) and the main condenser (3). The auxiliary heat exchanger (5) and the auxiliary heat exchanger (6) are connected through the auxiliary heat exchange channel (7) to realize air circulation and heat exchange between the auxiliary heat exchanger (5) and the auxiliary heat exchanger (6).

3. A heat pump drying module according to claim 2, characterized in that, The auxiliary heat exchanger (5) includes a heat exchange tube (501) and a plurality of auxiliary heat exchange plates (500). The auxiliary heat exchange plates (500) are installed outside the heat exchange tube (501). The two ends of the heat exchange tube (501) extend out of the shell (1) and are connected to the auxiliary heat exchange channel (7).

4. A heat pump drying module according to claim 3, characterized in that, The auxiliary heat exchange channel (7) includes a first air duct (710), a second air duct (720), and a third air duct (730). The first air duct (710) connects the air duct (101) and the first end of the first heat exchange tube (501). The second air duct (720) connects the second end of the first heat exchange tube (501) and the first end of the second heat exchange tube (601). The third air duct (730) connects the second end of the second heat exchange tube (601) and the air duct (101). A fan (711) is installed inside the first air duct (710).

5. A heat pump drying module according to claim 4, characterized in that, The air duct (101) has an extension cavity (1011) formed near the air inlet (102) facing away from the air outlet (103); the extension cavity (1011) is connected to the air inlet (102) through an opening (1012); the outer wall of the extension cavity (1011) is provided with an interface (104) and an interface (105), the air guide pipe (710) is connected to the interface (104), and the air guide pipe (730) is connected to the interface (105).

6. A heat pump drying module according to claim 5, characterized in that, The extension cavity 1011 has an opening 2 (1013) on the side opposite to the opening 1012. A sealing cover (1015) is provided inside the extension cavity (1011). The sealing cover (1015) is driven by a telescopic rod (1014) and can close the opening 1 (1012) or the opening 2 (1013).

7. A heat pump drying module according to claim 4, characterized in that, The auxiliary heat exchange channel (7) also includes a fourth air duct (740), and the fourth air duct (740), the third air duct (730) and the second heat exchange tube (601) are connected by a three-way connector (750); the air duct (101) is provided with an interface three (106) on the outside of the air outlet (103), and the fourth air duct (740) is connected to the interface three (106).

8. A heat pump drying module according to claim 7, characterized in that, The third air duct (730) is equipped with a damper (731), and the fourth air duct (740) is equipped with a damper (741).

9. A heat pump drying module according to claim 1, characterized in that, The air duct (101) is arranged from top to bottom. The air outlet (103) and air inlet (102) are located on the upper and lower sides of the shell (1), respectively. The evaporator (2) is located below the main condenser (3) and directly above the auxiliary condenser (4).

10. An integrated heat pump drying method, characterized in that, The heat pump drying module as described in any one of claims 1-9 is used.

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