Drying equipment with heat recovery function

Abstract

The drying equipment with the heat recovery function comprises a drying box, a heat exchanger is arranged on the drying box, and the heat exchanger comprises a plurality of first flow channels and second flow channels which are arranged at intervals; the heating unit comprises an evaporator and a condenser which are connected in series, the two ends of the first flow channel communicate with the windward side of the evaporator and the interior of the drying box correspondingly, the two ends of the second flow channel communicate with the leeward side of the evaporator and the windward side of the condenser correspondingly, and the leeward side of the condenser communicates with the interior of the drying box; the evaporator, the condenser, the first flow channel and the second flow channel form a gas circulation loop. The high-temperature and high-humidity gas in the drying box enters the first flow channel, the dehumidified low-temperature gas returns to the second flow channel through the second gas inlet, and the low-temperature gas absorbs heat in the gas in the first flow channel and is finally fed into the drying box for circular drying work. Heat of high-temperature gas in the drying box can be recycled, and the energy-saving effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of drying, and in particular to drying equipment with a heat recovery function. Background Art

[0002] Drying equipment is a kind of equipment that uses heat energy to heat materials to remove moisture from them to achieve the purpose of drying. It is widely used in the fields of industrial production and agricultural processing in the prior art. The basic means of using the reverse Carnot principle to achieve the drying effect is the basic means adopted by the existing drying equipment. Its principle is roughly as follows: during the drying operation, the refrigerant is pressurized by the compressor to become a high-temperature and high-pressure gas, and then enters the condenser on the indoor side. The condensation and liquefaction of the refrigerant can release high-temperature heat to heat the air in the drying room. The materials in the drying box are vaporized and evaporated in the form of hot air. The evaporated water vapor is discharged by the dehumidification system to dry the materials. The refrigerant after condensation and heat release passes through the throttle valve to become a low-temperature and low-pressure liquid. Due to the sudden drop in pressure, the liquid refrigerant enters the evaporator and continuously absorbs the low-level heat energy of the surrounding air and quickly evaporates into a gaseous state. The refrigerant that absorbs a certain amount of energy flows back to the compressor and enters the next cycle. In this way, the refrigerant circulates continuously to transport the heat in the air to the drying box to achieve the drying effect.

[0003] However, in the existing drying equipment, the high-humidity and high-temperature gases discharged from the drying box are directly discharged into the natural environment, which results in a large amount of heat being wasted. At the same time, the hot air directly discharged in some special areas will also cause pollution to the external environment. Therefore, it is necessary to design a drying equipment with heat recovery function. Summary of the invention

[0004] The present invention proposes a drying device with a heat recovery function, aiming to solve the problem that high-humidity and high-temperature gas in the drying device in the prior art is directly discharged into the atmospheric environment, causing serious waste of heat energy.

[0005] The technical solution adopted by the invention is: a drying equipment with heat recovery function, comprising: a drying box, a heat exchanger is provided on the drying box, and the heat exchanger includes a plurality of first flow channels and second flow channels arranged at intervals; a heating unit, the heating unit includes an evaporator and a condenser connected in series, the two ends of the first flow channel are respectively connected to the windward side of the evaporator and the inside of the drying box, the two ends of the second flow channel are respectively connected to the leeward side of the evaporator and the windward side of the condenser, the leeward side of the condenser is connected to the inside of the drying box, and the evaporator, condenser, first flow channel and second flow channel form a gas circulation loop.

[0006] Furthermore, the heat exchanger is arranged on the top of the drying box, a first fan unit is also arranged inside the drying box, and the leeward side of the condenser is connected to the bottom of the drying box.

[0007] Furthermore, the heat exchanger is arranged on the top of the drying box, and the heat exchanger includes a main body, in which a plurality of first flow channels and second flow channels are arranged at intervals, and the first flow channels and the second flow channels are separated by a partition, the first air inlet and the first exhaust port are respectively connected to the two ends of the first flow channel, the second air inlet and the second exhaust port are respectively connected to the two ends of the second flow channel, the first air inlet is connected to the drying box, the first exhaust port is connected to the evaporator, and the second exhaust port is connected to the windward side of the condenser.

[0008] Furthermore, the heat exchanger also includes a first exhaust hood detachably connected to the main body, the first exhaust hood is arranged on the outside of the first exhaust port, at least one exhaust pipe is provided on the first exhaust hood, and a plurality of groups of spiral blades are provided in the exhaust pipe. The first exhaust hood is also provided with a water collecting tray, and the water collecting tray is arranged below the exhaust pipe.

[0009] Furthermore, a mounting opening is provided on the first exhaust hood, and the water collecting tray is inserted into the first exhaust hood through the mounting opening. A baffle is also provided on one side of the water collecting tray, and the baffle is clamped on the outer side of the mounting opening. A handle is provided on the baffle.

[0010] Furthermore, the heating unit also includes a compressor and a throttling device, and the compressor, the throttling device, the evaporator and the condenser form a refrigerant circulation loop.

[0011] Furthermore, the heating unit also includes at least one auxiliary air heating device, which is arranged on the gas circulation loop, and the auxiliary air heating device is arranged between the air outlet side of the condenser and the windward side of the first fan unit for secondary heating of the air.

[0012] Furthermore, the auxiliary air heating device is a heat exchanger, and the auxiliary air heating device is arranged in the refrigerant circulation loop and connected in parallel with the condenser.

[0013] Furthermore, the outside of the drying device also includes a first air guide cover and a second air guide cover, the first air guide cover connects the first flow channel and the evaporator, and the second air guide cover connects the second flow channel and the condenser; the inside of the drying device is provided with a third air guide cover, and the third air guide cover connects the evaporator and the second flow channel.

[0014] Furthermore, the gas circulation loop also includes a second fan unit arranged between the evaporator and the heat exchanger.

[0015] Compared with the prior art, the present invention allows the high-temperature and high-humidity gas in the drying box to enter the first flow channel, then flows out of the heat exchanger through the first flow channel and is connected to the cooling device for cooling and dehumidification. The low-temperature gas after dehumidification returns to the second flow channel through the second air inlet, and the low-temperature gas absorbs the heat in the gas in the first flow channel and is finally sent to the drying box for cyclic drying. The heat exchanger proposed in the present invention can use the evaporator to dehumidify the high-temperature gas, and use the high-temperature and high-humidity gas in the drying box for heat exchange with the cold air after dehumidification, thereby realizing heat recovery. The heated gas enters the condenser for further heating, and finally returns to the drying box for drying. It not only improves the utilization rate of energy through heat recovery, but also avoids the continuous discharge of harmful gases to cause air pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the drying device in the first embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the drying device in the first embodiment of the present invention;

[0019] Figure 3 It is a structural block diagram of the gas circulation loop of the drying equipment in the first embodiment of the present invention;

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of the heat exchanger in the first embodiment of the present invention;

[0021] Figure 5 It is a bottom view structural schematic diagram of the heat exchanger in the first embodiment of the present invention;

[0022] Figure 6 is a schematic cross-sectional structure diagram of the second flow channel in the first embodiment of the present invention;

[0023] Figure 7 is a schematic cross-sectional structure diagram of the first flow channel in the first embodiment of the present invention;

[0024] Figure 8 It is a schematic diagram of the explosion structure of the first exhaust hood in the first embodiment of the present invention;

[0025] Fig. 9 for Figure 8 A is a schematic diagram of the enlarged structure of the middle part;

[0026] Fig.10 It is a schematic diagram of the flow of gas in the first exhaust hood in Example 1;

[0027] Fig.11 is a schematic diagram of the three-dimensional structure of a heat exchanger in Embodiment 2 of the present invention;

[0028] Fig.12 This is a schematic diagram of the cross-sectional structure of a drying device in Embodiment 2 of the present invention;

[0029] Fig.13 for Fig.12 A schematic diagram of the cross-sectional structure of the drying equipment when the air duct is omitted.

[0030] The main figures in the present application are as follows: 1. main body; 2. first flow channel; 3. second flow channel; 5. first air inlet; 6. second exhaust port; 7. first exhaust port; 8. second air inlet; 9. first exhaust hood; 10. exhaust pipe; 11. spiral blade; 12. water collecting tray; 13. installation port; 14. baffle; 15. handle; 16. second exhaust hood; 17. evaporator; 18. condenser; 19. first fan unit; 20. compressor; 21. throttling device; 22. first air guide cover; 23. second air guide cover; 24. third air guide cover; 25. drying box; 26. auxiliary air heating device; 27. second fan unit. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] The present application proposes a drying device with a heat recovery function. The drying device proposed in the present invention aims to achieve heat recovery, using the heated gas to enter the condenser for further heating, and finally return to the drying box for drying. It not only improves the utilization rate of energy through heat recovery, but also avoids the continuous discharge of harmful gases to cause air pollution.

[0033] Embodiment 1

[0034] Combined with Figures 1 to 3As shown, in the first embodiment, the drying equipment in the present application includes a drying box 25, a heat exchanger and a heating unit, the heat exchanger includes a plurality of first flow channels and second flow channels arranged at intervals, the gases in the first flow channels and the second flow channels flow in opposite directions for heat exchange, the heating unit includes an evaporator 17 and a condenser 18 connected in series, and the setting positions of the evaporator 17 and the condenser 18 can be adaptively adjusted according to actual needs, for example: the evaporator 17 and the condenser 18 are fixedly installed on the outside of the drying box 25, the two ends of the first flow channel are respectively connected to the windward side of the evaporator 17 and the inside of the drying box 25, the two ends of the second flow channel are respectively connected to the leeward side of the evaporator 17 and the windward side of the condenser 18, and the leeward side of the condenser 18 It is connected to the inside of the drying box 25, and the evaporator 17, the condenser 18, the first flow channel and the second flow channel are connected by pipes or air ducts to form a gas circulation loop. The high-temperature and high-humidity gas in the drying box 25 enters the heat exchanger through the first flow channel. After heat exchange, the temperature is reduced and enters the evaporator 17 to continue to cool down. The high-humidity gas becomes low-temperature and low-humidity gas after the temperature drops after passing through the evaporator 17. The low-temperature and low-humidity gas flows into the second flow channel of the heat exchanger to exchange heat with the high-temperature and high-humidity gas, thereby recovering part of the heat to make the temperature rise to become medium-temperature and low-humidity gas. The medium-temperature and low-humidity gas enters the condenser 18 to continue to heat up to form high-temperature and low-humidity gas, and the high-temperature and low-humidity gas flows back to the drying box 25 to continue drying and take away the moisture of the material.

[0035] Specifically, the heat exchanger in the present application can be fixedly arranged at the top position of the drying box 25, and of course, it can also be detachably fixed at the top of the drying box 25. The present application does not make specific restrictions, and the two fixing methods have no essential impact on the technical problems to be solved by the present application. A first fan unit 19 is arranged at a lower position inside the drying box 25, and the first fan unit 19 includes at least one fan. The leeward side (air outlet side) of the condenser 18 is arranged on the air suction side of the first fan unit 19, so that the dry hot air is continuously drawn into the drying box 25 under the action of the first fan unit 19. Preferably, the leeward side of the condenser 18 is arranged near the bottom position inside the drying box 25 to fully dry the material. The leeward side of the condenser 18 can be transported to the drying box 25 through the air duct, or it can be directly arranged on the inner side of the drying box 25.

[0036] Furthermore, the heating unit is a prior art, and only the necessary structure and principle are described here. In addition to the above-mentioned evaporator 17 and condenser 18, the heating unit also includes a compressor 20 and a throttling device 21. The compressor 20, the throttling device 21 and the evaporator 17 and the condenser 18 form a refrigerant circulation loop (it should be noted that the throttling device 21 and the compressor 20 are all existing components in the art, and their installation positions and specific structures have no effect on the implementation of this application, so in Figure 2The heat is transferred by the circulation of the refrigerant, wherein the compressor 20 compresses the gaseous refrigerant into a high-temperature and high-pressure gas, and then sends it to the condenser 18 for heat release and cooling. After cooling, it becomes a medium-temperature and high-pressure liquid refrigerant, and then passes through the throttling device 21 (expansion valve) to throttle and reduce the pressure, becoming a low-temperature and low-pressure gas-liquid mixture, and then passes through the evaporator 17 to absorb heat from the air and vaporize, and after becoming a gas, it returns to the compressor 20 to continue the compression cycle. Preferably, the heating unit in the present application may also include at least one auxiliary air heating device (not shown in the figure), which is arranged on the gas circulation loop and connected in series with the condenser 18, so as to ensure that the temperature entering the drying box 25 is high enough.

[0037] For further information, see Appendix Figures 4 to 7 As shown, a heat exchanger in a specific embodiment of the present invention includes a main body 1, wherein the shape of the main body 1 includes but is not limited to a rectangular, cylindrical, etc. This embodiment is illustrated by taking a rectangular main body 1 as an example, the interior of the main body 1 is hollow, and a plurality of partitions are arranged inside the main body 1, and the interior of the main body 1 is divided into a plurality of elongated flow channels by the partitions, and these flow channels include a first flow channel 2 and a second flow channel 3, and the first flow channel 2 and the second flow channel 3 are arranged at intervals from each other, that is, the first flow channel 2 and the second flow channel 3 are separated from each other by the partitions, and a first air inlet 5 and a second exhaust port 6 are respectively arranged at one end of the main body 1, and a second air inlet 8 and a first exhaust port 7 are respectively arranged at the other end of the main body 1; specifically: one end of each first flow channel 2 is the first exhaust port 7, and the other end is the first air inlet 5, and one end of each second flow channel 3 is the second air inlet 8, and the other end is the second exhaust port 6. During the installation process, the first air inlet 5 is arranged inside the drying box 25, and the high-temperature and high-humidity gas in the drying box 25 is sucked into the first flow channel 2 through the first air inlet 5. The first exhaust port 7 is connected with the second air inlet 8, and the second exhaust port 6 is connected to the drying box 25. The high-temperature and high-humidity gas flows out through the first flow channel 2 and then flows back into the second flow channel 3, and continues to enter the drying box 25 through the second flow channel 3 for drying. When the high-temperature and high-humidity gas passes through the first flow channel 2 and exchanges heat with the gas in the second flow channel 3, the gas in the second flow channel 3 The temperature of the body will decrease after flowing out of the heat exchanger (or enter the evaporator 17 for cooling and dehumidification, or cool and dehumidify naturally through contact with the external environment), so the gas in the second flow channel 3 will exchange heat with the high-temperature and high-humidity gas in the first flow channel 2, so that the temperature of the low-temperature and low-humidity air in the second flow channel 3 will increase, and finally flow back to the drying box 25 for circulation heating (it can be heated by the condenser 18 or the electric heater), so that part of the heat in the first flow channel 2 can be recovered to continue drying, which plays a role in energy saving and environmental protection.

[0038] In addition, combined with Figure 4 , 8 As shown in Figures 9 and 10, after the high-temperature and high-humidity gas in the first flow channel 2 exchanges heat with the low-temperature gas in the second flow channel 3, the temperature of the gas in the first flow channel 2 decreases, so a small amount of condensation will also occur. In this embodiment, a first exhaust hood 9 is also provided on the outside of the heat exchanger. The first exhaust hood 9 is detachably connected to the main body 1. The first exhaust hood 9 is provided at the outer position of all the first exhaust ports 7. The first exhaust hood 9 can collect the gas in the first flow channel 2 to facilitate the discharge of the gas. In addition, at least one exhaust pipe 10 (three in this embodiment) is provided on the first exhaust hood 9, and a plurality of groups of spiral blades 11 are provided in the exhaust pipe 10. The spiral blades 11 can produce a swirl effect on the airflow to perform gas-liquid separation, so that the gas in the first flow channel 2 is cooled and the liquid droplets in the gas are collected by the swirl effect, thereby playing a certain dehumidification role and improving the dehumidification effect. Furthermore, a water collecting tray 12 may be provided in the first exhaust hood 9 . The water collecting tray 12 is provided below the exhaust pipe 10 . The water collecting tray 12 can collect the droplets collected in the exhaust pipe 10 , and then discharge or recycle them in a centralized manner through the water collecting tray 12 .

[0039] Furthermore, if Figure 8 , 9 As shown, the water collecting pan 12 in this embodiment is pull-out arranged. By opening a mounting opening 13 on the first exhaust hood 9, the water collecting pan 12 is inserted into the first exhaust hood 9 through the mounting opening 13, and a baffle 14 is also provided on one side of the water collecting pan 12. The baffle 14 is clamped on the outer side of the mounting opening 13, and a handle 15 is provided on the baffle 14 to facilitate pulling out the water collecting pan 12 for cleaning.

[0040] Furthermore, the heat exchanger also includes a second exhaust hood 16, which is provided with a circular opening and is connected to the pipeline through a flange, so as to facilitate the connection of the main body 1 with external equipment through the pipeline; the second exhaust hood 16 is detachably connected to the main body 1, and the second exhaust hood 16 is arranged on the outside of the second air inlet 8. In this embodiment, the first exhaust port 7 and the second air inlet 8 are arranged at the same end of the main body 1, and the first exhaust port 7 is arranged on the upper side of the second air inlet 8, that is, the second exhaust hood 16 is located below the first exhaust hood 9, and both are fixed to the end of the main body 1 by screw connection. Specifically, it can be: a peripheral extension plate is provided at the end of the main body 1, and the outer contour of the extension plate is consistent with the inner contour of the first exhaust hood 9 and the second exhaust hood 16. The first exhaust hood 9 and the second exhaust hood 16 are mounted on the extension plate, and then the first exhaust hood 9, the second exhaust hood 16 and the extension plate are fixed by screws, or a sealing material can be filled between the extension plate and the first exhaust hood 9 and the second exhaust hood 16 for sealing.

[0041] Preferably, the material of the partition is one of aluminum, copper and stainless steel, which has good thermal conductivity and high supporting strength.

[0042] Furthermore, in a specific embodiment of the present application, the heat exchanger, condenser 18 and evaporator 17 are all arranged outside the drying box 25, so it is necessary to specially set up a first flow guide hood 22, a second flow guide hood 23 and a third flow guide hood 24 for gas transportation, wherein the first flow guide hood 22 connects the first flow channel and the evaporator 17, the second flow guide hood 23 connects the second flow channel and the condenser 18, and the third flow guide hood 24 is provided on the inner side of the drying equipment, and the third flow guide hood 24 connects the evaporator 17 and the second flow channel, thereby forming a closed gas circulation loop to ensure the normal transportation of the gas.

[0043] The above are only specific embodiments that can be implemented. Those skilled in the art should know that each component in the heating unit (condenser 18, evaporator 17, compressor 20 and throttling device 21) can be adaptively adjusted according to the site, cost and design requirements, so that these components can be arranged at any position inside or outside the drying box 25 and equipped with corresponding pipelines for communication.

[0044] Embodiment 2

[0045] The present invention does not limit the specific directions and arrangements of the first air inlet 5, the second air outlet 6, the second air inlet 8 and the first air outlet 7. Fig.11 As shown, in the second embodiment of the heat exchanger, the following settings can also be made according to actual needs: the first air inlet 5 and the first exhaust port 7 are respectively arranged on both sides of the main body 1, the second air inlet 8 and the first exhaust port 7 are arranged on the same side and are spaced apart, and the second exhaust port 6 is arranged above the main body 1 and on a side away from the second air inlet 8.

[0046] Based on the specific heat exchanger proposed in the second embodiment, the present invention further proposes a second embodiment of a drying box, such as Fig.12 As shown, in the second embodiment, the drying equipment includes a drying box 25, a heat exchanger and a heating unit. Fig.11 As shown, the difference between it and the heat exchanger of embodiment 1 is that the setting directions of the air inlet and the exhaust port are different. The heating unit includes an evaporator 17 and a condenser 18 connected in series. The evaporator 17 is arranged at the top of the drying box 25 and is connected to the first exhaust port 7 through the first air guide cover 22. A second fan unit 27 is arranged at the upper exhaust port of the evaporator 17. The second fan unit 27 increases the wind pressure and improves the air flow efficiency. The air outlet side of the second fan unit 27 is connected to the second air inlet 8 through the third air guide cover 24, so that the air cooled and dehumidified by the evaporator 17 is transported back to the heat exchanger for heating.

[0047] In the second embodiment, the condenser 18 is arranged at a position above the drying box 25, and the air inlet side of the condenser 18 is connected to the second exhaust port 6 through the second air guide cover 23. The medium-temperature gas heated by the heat exchanger first enters the condenser 18 for the first heating. The air outlet side (i.e., the leeward side) below the condenser 18 is located at a lower position inside the drying box. An auxiliary air heating device 26 is arranged opposite to the air outlet side below the condenser 18. The position above the auxiliary air heating device 26 opposite to the condenser 18 is the air inlet side (i.e., the windward side), and the side of the condenser is the air outlet side. The hot air sent out from the bottom of the condenser 18 is sucked into the auxiliary air heating device 26 for the second heating through the first fan unit 19 arranged below the drying box 25, and then transported from the bottom of the drying box to the drying box for continuous drying.

[0048] In this embodiment, an auxiliary air heating device 26 is added, and the auxiliary air heating device 26 also adopts a heat exchanger structure with the same function and principle as the condenser 18, and the evaporator 17, the condenser 18, the compressor 20, the throttling device 21, etc. are connected in series to form a refrigerant circulation loop (it should be noted that the throttling device 21 and the compressor 20, etc. are all existing components in the field, and their installation positions and specific structures have no effect on the implementation of this application, so in Fig.12 The auxiliary air heating device 26 is connected in parallel with the condenser 18 to the refrigerant circulation loop, and heat is transferred by the circulating flow of the refrigerant. The compressor 20 compresses the gaseous refrigerant into a high-temperature and high-pressure gas, and then sends it to the condenser 18 for the first heat release cooling and the auxiliary air heating device 26 for the second heat release cooling. After being cooled by the condenser 18 and the auxiliary air heating device 26, it becomes a medium-temperature and high-pressure liquid refrigerant, and then passes through the throttling device 21 (expansion valve) to throttle and reduce the pressure, becoming a low-temperature and low-pressure gas-liquid mixture, and then passes through the evaporator 17 to absorb heat in the air and vaporize, and after becoming a gas, it returns to the compressor 20 to continue the compression cycle.

[0049] The high-temperature and high-humidity gas in the drying box 25 enters the heat exchanger through the first flow channel. After heat exchange, the temperature is reduced and enters the evaporator 17 to continue to cool down. The high-humidity gas becomes low-temperature and low-humidity gas after the temperature drops after passing through the evaporator 17. The low-temperature and low-humidity gas flows into the second flow channel of the heat exchanger to exchange heat with the high-temperature and high-humidity gas, thereby recovering part of the heat to increase the temperature and become medium-temperature and low-humidity gas. The medium-temperature and low-humidity gas enters the condenser 18 to continue to heat up to form high-temperature and low-humidity gas. The high-temperature and low-humidity gas flows back to the drying box 25 to continue drying and remove moisture from the material.

[0050] Specifically, the heat exchanger in the present application can be fixed at the top position of the drying box 25, and of course can also be detachably fixed at the top of the drying box 25. The present application does not make specific limitations, and the two fixing methods have no essential impact on the technical problems to be solved by the present application.

[0051] The principle of the present invention is as follows: the high-temperature and high-humidity gas in the drying box 25 enters the first flow channel 2, then flows out of the heat exchanger through the first flow channel 2 and is connected to the cooling device (such as the evaporator 17) for cooling and dehumidification. The low-temperature gas after dehumidification returns to the second flow channel 3 through the second air inlet 8. The low-temperature gas absorbs the heat in the gas in the first flow channel 2 and is finally sent to the drying box 25 for cyclic drying (it can be heated by the condenser 18 and the auxiliary air heating device 26 before being sent in). The present invention allows the high-temperature and high-humidity gas in the drying box 25 to enter the first flow channel, then flows out of the heat exchanger through the first flow channel and is connected to the cooling device The device is used for cooling and dehumidification. The low-temperature gas after dehumidification returns to the second flow channel through the second air inlet. The low-temperature gas absorbs the heat in the gas in the first flow channel and is finally sent to the drying box 25 for cyclic drying. The heat exchanger proposed in the present invention can use the evaporator 17 to dehumidify the high-temperature gas, and use the high-temperature and high-humidity gas in the drying box 25 to exchange heat with the cold air after dehumidification, thereby realizing heat recovery. The heated gas enters the condenser 18 for further heating, and finally returns to the drying box 25 for drying. The energy utilization rate is improved by heat recovery, and the air pollution caused by the continuous discharge of harmful gases is avoided.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A drying device with heat recovery function, characterized in that: The invention comprises: a drying box, wherein a heat exchanger is provided on the drying box, wherein the heat exchanger comprises a plurality of first flow channels and second flow channels which are arranged at intervals; a heating unit, wherein the heating unit comprises an evaporator and a condenser which are connected in series, wherein the two ends of the first flow channel are respectively connected to the windward side of the evaporator and the interior of the drying box, and the two ends of the second flow channel are respectively connected to the leeward side of the evaporator and the windward side of the condenser, and the leeward side of the condenser is connected to the interior of the drying box, and the evaporator, the condenser, the first flow channel and the second flow channel form a gas circulation loop.

2. The drying device according to claim 1, characterized in that: The heat exchanger is arranged on the top of the drying box, a first fan unit is also arranged inside the drying box, and the leeward side of the condenser is connected to the bottom of the drying box.

3. The drying device according to claim 1, characterized in that: The heat exchanger is arranged on the top of the drying box, and the heat exchanger includes a main body. A plurality of first flow channels and second flow channels are arranged in the main body. The first flow channels and the second flow channels are arranged at intervals, and the first flow channels and the second flow channels are separated by a partition. The first air inlet and the first exhaust port are respectively connected to the two ends of the first flow channel, and the second air inlet and the second exhaust port are respectively connected to the two ends of the second flow channel. The first air inlet is connected to the drying box, the first exhaust port is connected to the evaporator, and the second exhaust port is connected to the windward side of the condenser.

4. The drying device according to claim 3, characterized in that: The heat exchanger also includes a first exhaust hood detachably connected to the main body, the first exhaust hood is arranged on the outside of the first exhaust port, at least one exhaust pipe is provided on the first exhaust hood, a plurality of groups of spiral blades are provided in the exhaust pipe, and a water collecting tray is also provided in the first exhaust hood, and the water collecting tray is arranged below the exhaust pipe.

5. The drying device according to claim 4, characterized in that: The first exhaust hood is provided with an installation opening, the water collecting tray is inserted into the first exhaust hood through the installation opening, and a baffle is further provided on one side of the water collecting tray, the baffle is clamped on the outer side of the installation opening, and a handle is provided on the baffle.

6. The drying device according to claim 1, characterized in that: The heating unit further comprises a compressor and a throttling device, and the compressor, the throttling device, the evaporator and the condenser form a refrigerant circulation loop.

7. The drying device according to claim 6, characterized in that: The heating unit also includes at least one auxiliary air heating device, which is arranged on the gas circulation loop and between the air outlet side of the condenser and the windward side of the first fan unit for secondary heating of the air.

8. The drying device according to claim 7, characterized in that: The auxiliary air heating device is a heat exchanger, and the auxiliary air heating device is arranged in the refrigerant circulation loop and connected in parallel with the condenser.

9. The drying device according to claim 1, characterized in that: The outside of the drying device also includes a first air guide cover and a second air guide cover, the first air guide cover connects the first flow channel and the evaporator, and the second air guide cover connects the second flow channel and the condenser; the inside of the drying device is provided with a third air guide cover, and the third air guide cover connects the evaporator and the second flow channel.

10. The drying device according to claim 1, characterized in that: The gas circulation loop also includes a second fan unit arranged between the evaporator and the heat exchanger.

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