Fresh air automatic optimization low-temperature refrigeration dehumidifier

Abstract

The utility model relates to the field of dehumidifiers, in particular to a fresh air automatic optimization low-temperature refrigeration dehumidifier which comprises a fresh air path, a regeneration air path, a first air return path and a fresh air automatic optimization assembly. One end of the first return air path is communicated with the exhaust end of the regeneration air path, and the other end is respectively communicated with the outside and the air inlet end of the fresh air path; the fresh air automatic optimizing assembly selectively conducts or cuts off the communication section between one end of the first air return path and the outside and the air inlet end of the fresh air path. The fresh air automatic optimizing assembly controls connection and disconnection of different communication parts on the first air return path, so that when the exhaust air moisture content of the regeneration air path is smaller than the inlet air moisture content of the fresh air path, the regeneration air path and the outside air path are disconnected, and the regeneration air path and the air path at the air inlet end of the fresh air path are connected; and the exhaust air of the regeneration air path is introduced into the fresh air path, so that the exhaust air is recycled, and the subsequent dehumidification energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the field of dehumidifiers, in particular to a low-temperature refrigeration dehumidifier capable of automatically optimizing fresh air. Background Art

[0002] The fresh air in the drying room must be processed by the dehumidifier before being input. On the one hand, the fresh air processed by the dehumidifier can provide some oxygen for the drying room to meet the oxygen demand of the personnel, and partially maintain the positive pressure in the drying room; on the other hand, part of it is used by the dehumidifier itself as a source of regeneration exhaust air; but in different seasons, the humidity content of the outdoor fresh air is different, resulting in the situation that the humidity content of the regeneration hot exhaust air of the low-temperature refrigeration dehumidifier is lower than the outdoor fresh air in some time periods. In this way, the regeneration hot exhaust air discharged has a certain value of moisture recovery or heat recovery. In common designs, the regeneration hot exhaust air is directly discharged from the dehumidifier as exhaust air, which wastes energy and cannot be effectively recycled. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a low-temperature refrigeration dehumidifier which can realize the automatic optimization of fresh air by selectively utilizing the regenerated exhaust air to improve energy saving and emission reduction.

[0004] In order to solve the above-mentioned technical problems, the technical solution adopted by the utility model is: a low-temperature refrigeration dehumidifier with automatic fresh air optimization, comprising a fresh air path, a regeneration air path, a first return air path and a fresh air automatic optimization component, wherein the fresh air path is connected to the regeneration air path; one end of the first return air path is connected to the exhaust end of the regeneration air path, and the other end is respectively connected to the outside world and the air inlet end of the fresh air path; the fresh air automatic optimization component selectively opens or cuts off the connecting section between one end of the first return air path and the outside world and the air inlet end of the fresh air path.

[0005] Furthermore, the fresh air automatic optimization component includes a controller, a first air valve, a second air valve, a first temperature and humidity sensor, and a second temperature and humidity sensor. The first air valve is arranged at a connecting section between one end of the first return air passage and the outside world, and the second air valve is arranged at a connecting section between one end of the first return air passage and the air inlet end of the fresh air passage; the first temperature and humidity sensor is arranged at the exhaust end of the regeneration air passage, and the second temperature and humidity sensor is arranged at the air inlet end of the fresh air passage; the controller is electrically connected to the first air valve, the second air valve, the first temperature and humidity sensor, and the second temperature and humidity sensor.

[0006] Furthermore, it also includes a second return air duct, one end of which is connected to the exhaust end of the fresh air duct, and the other end is connected to the front section of the fresh air duct corresponding to the connection position between the regeneration air duct and the fresh air duct.

[0007] Furthermore, it also includes a front wheel and a rear wheel, and the fresh air path and the regeneration air path both pass through the front wheel and the rear wheel in sequence; the connecting position of the fresh air path and the regeneration air path is located between the front wheel and the rear wheel.

[0008] Furthermore, it also includes a front surface cooler, a middle surface cooler and a rear surface cooler. The front surface cooler is arranged between the air inlet end of the fresh air duct and the front impeller; the fresh air duct between the front impeller and the rear impeller is sequentially provided with a connecting position between the second return air duct and the fresh air duct, a connecting position between the regeneration air duct and the fresh air duct, and a middle surface cooler; the rear surface cooler is arranged between the rear impeller and the exhaust end of the fresh air duct.

[0009] Furthermore, it also includes a primary filter and a medium filter. The primary filter is arranged between the air inlet end of the fresh air path and the front surface cooler; the medium filter is arranged between the middle surface cooler and the rear impeller.

[0010] Furthermore, it also includes a first-stage air supply fan, a second-stage air supply fan and a regeneration fan, wherein the first-stage air supply fan is arranged on the fresh air path between the front impeller and the rear impeller; the second-stage air supply fan is arranged between the rear impeller and the exhaust end of the fresh air path; the regeneration fan is arranged between the exhaust end of the regeneration air path and the front impeller.

[0011] Furthermore, it also includes a fresh air valve, an air supply valve and a regeneration air valve, the fresh air valve is arranged between the air inlet end of the fresh air passage and the primary filter; the air supply valve is arranged between the rear surface cooler and the exhaust end of the fresh air passage; the regeneration air valve is arranged between the connecting position of the regeneration air passage and the fresh air passage and the rear impeller.

[0012] Furthermore, it also includes a front regeneration heater and a rear regeneration heater, the front regeneration heater is arranged on the regeneration air path between the front wheel and the rear wheel; the rear regeneration heater is arranged between the rear wheel and the connecting position between the regeneration air path and the fresh air path.

[0013] The beneficial effect of the present utility model is that: through the control of the connection and cutoff of different connecting parts on the first return air air path by the fresh air automatic optimization component, it can be achieved that when the exhaust moisture content of the regeneration air path is less than the inlet moisture content of the fresh air path, the regeneration air path and the outside air path are cut off, the regeneration air path and the air inlet end of the fresh air path are connected, and the exhaust air of the regeneration air path is introduced into the fresh air path, so as to be recycled and reused, thereby reducing the subsequent dehumidification energy consumption; on the contrary, when the exhaust moisture content of the regeneration air path is greater than the inlet moisture content of the fresh air path, the regeneration air path and the outside air path are connected, the regeneration air path and the air inlet end of the fresh air path are cut off, and the fresh air is directly introduced into the fresh air path for dehumidification treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a low-temperature refrigeration dehumidifier with automatic fresh air optimization according to a specific implementation mode of the utility model.

[0015] Description of labels:

[0016] 1. Fresh air path; 2. Regeneration air path; 3. First return air path; 4. Second return air path; 5. Front rotor; 6. Rear rotor; 7. Front surface cooling; 8. Middle surface cooling; 9. Rear surface cooling; 10. Primary filter; 11. Middle filter; 12. First-stage air supply fan; 13. Second-stage air supply fan; 14. Regeneration fan; 15. Fresh air valve; 16. Air supply valve; 17. Regeneration valve; 18. Front regeneration heater; 19. Rear regeneration heater;

[0017] 4. Fresh air automatic optimization component; 41. First air valve; 42. Second air valve; 43. First temperature and humidity sensor; 44. Second temperature and humidity sensor. DETAILED DESCRIPTION

[0018] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0019] Please refer to Figure 1 A low-temperature refrigeration dehumidifier with automatic fresh air optimization, comprising a fresh air path 1, a regeneration air path 2, a first return air path 3 and a fresh air automatic optimization component 4, wherein the fresh air path 1 is connected to the regeneration air path 2; one end of the first return air path 3 is connected to the exhaust end of the regeneration air path 2, and the other end is respectively connected to the outside world and the air inlet end of the fresh air path 1; the fresh air automatic optimization component 4 selectively opens or cuts off the connecting section between one end of the first return air path 3 and the outside world and the air inlet end of the fresh air path 1.

[0020] From the above description, it can be seen that the beneficial effect of the utility model is that: through the control of the connection and cutoff of different connecting parts on the first return air duct 3 by the fresh air automatic optimization component 4, it can be achieved that when the exhaust air moisture content of the regeneration air duct 2 is less than the inlet air moisture content of the fresh air duct 1, the regeneration air duct 2 and the external air duct are cut off, the regeneration air duct 2 and the air inlet end of the fresh air duct 1 are connected, and the exhaust air of the regeneration air duct 2 is introduced into the fresh air duct 1, so as to be recycled and reused, thereby reducing the subsequent dehumidification energy consumption; on the contrary, when the exhaust air moisture content of the regeneration air duct 2 is greater than the inlet air moisture content of the fresh air duct 1, the regeneration air duct 2 and the external air duct are connected, the regeneration air duct 2 and the air inlet end of the fresh air duct 1 are cut off, and the fresh air is directly introduced into the fresh air duct 1 for dehumidification treatment.

[0021] Furthermore, the fresh air automatic optimization component 4 includes a controller, a first air valve 41, a second air valve 42, a first temperature and humidity sensor 43 and a second temperature and humidity sensor 44; the first air valve 41 is arranged at a connecting section between one end of the first return air passage 3 and the outside, and the second air valve 42 is arranged at a connecting section between one end of the first return air passage 3 and the air inlet end of the fresh air passage 1; the first temperature and humidity sensor 43 is arranged at the exhaust end of the regeneration air passage 2, and the second temperature and humidity sensor 44 is arranged at the air inlet end of the fresh air passage 1; the controller is electrically connected to the first air valve 41, the second air valve 42, the first temperature and humidity sensor 43 and the second temperature and humidity sensor 44.

[0022] From the above description, it can be known that the exhaust air at the exhaust end of the regeneration air path 2 and the supply air at the inlet end of the fresh air path 1 are detected respectively by the first temperature and humidity sensor 43 and the second temperature and humidity sensor 44, and the controller determines to control the first air valve 41 to open or close the connecting section between the first return air path 3 and the fresh air path 1, and controls the second air valve 42 to open or close the connecting section between the first return air path 3 and the outside world.

[0023] Furthermore, it also includes a second return air duct 4, one end of which is connected to the exhaust end of the fresh air duct 1, and the other end is connected to the front section of the fresh air duct 1 corresponding to the connection position between the regeneration air duct 2 and the fresh air duct 1.

[0024] From the above description, it can be seen that after the fresh air from the fresh air duct 1 enters the room, the indoor exhaust air can be introduced into the fresh air duct 1 through the second return air duct 4 for reuse. Compared with the untreated fresh air from the outside, the humidity of this type of return air is lower than that of the outside, and the temperature is higher than that of the outside. Reuse can reduce the air intake of the fresh air duct 1 and reduce the energy consumption of subsequent dehumidification and cooling.

[0025] Furthermore, it also includes a front wheel 5 and a rear wheel 6, and the fresh air path 1 and the regeneration air path 2 pass through the front wheel 5 and the rear wheel 6 in sequence; the connecting position of the fresh air path 1 and the regeneration air path 2 is located between the front wheel 5 and the rear wheel 6.

[0026] From the above description, it can be seen that the first-level and second-level dehumidification and heating of the air supplied in the fresh air path 1 are realized through the front wheel 5 and the rear wheel 6; the front wheel 5 and the rear wheel 6 serve as regeneration wheels, which can exchange temperature and humidity through the regeneration air path 2 for recycling.

[0027] Furthermore, it also includes a front surface cooler 7, a middle surface cooler 8 and a rear surface cooler 9, the front surface cooler 7 is arranged between the air inlet end of the fresh air path 1 and the front impeller 5; the fresh air path 1 between the front impeller 5 and the rear impeller 6 is sequentially provided with a connecting position between the second return air path 4 and the fresh air path 1, a connecting position between the regeneration air path 2 and the fresh air path 1 and a middle surface cooler 8; the rear surface cooler 9 is arranged between the rear impeller 6 and the exhaust end of the fresh air path 1.

[0028] From the above description, it can be seen that the design of the front surface cooler 7, the middle surface cooler 8 and the rear surface cooler 9 makes it possible to cool and dehumidify the supply air multiple times in sequence on the fresh air path 1; after the fresh air enters the fresh air path 1, it is cooled and dehumidified by the front surface cooler 7, and then heated and dehumidified by the front rotor 5, and then cooled and dehumidified again by the middle surface cooler 8, heated and dehumidified by the rear rotor 6, and finally cooled and dehumidified by the rear surface cooler 9 to a suitable temperature and humidity and delivered into the room.

[0029] Furthermore, it also includes a primary filter 10 and a medium filter 11. The primary filter 10 is arranged between the air inlet end of the fresh air path 1 and the front surface cooler 7; the medium filter 11 is arranged between the middle surface cooler 8 and the rear impeller 6.

[0030] It can be seen from the above description that the introduced fresh air can be filtered and cleaned multiple times through the cooperation of the primary filter 10 and the medium filter 11.

[0031] Furthermore, it also includes a first-stage air supply fan 12, a second-stage air supply fan 13 and a regeneration fan 14, wherein the first-stage air supply fan 12 is arranged on the fresh air path 1 between the front impeller 5 and the rear impeller 6; the second-stage air supply fan 13 is arranged between the rear impeller 6 and the exhaust end of the fresh air path 1; and the regeneration fan 14 is arranged between the exhaust end of the regeneration air path 2 and the front impeller 5.

[0032] From the above description, it can be seen that the first-level air supply fan 12, the second-level air supply fan 13 and the regeneration fan 14 are used to supply air to the fresh air duct 1 and the regeneration air duct 2 respectively, ensuring that the air in the air duct can be quickly filtered, cooled and dehumidified, and subjected to a series of treatments such as rotary dehumidification.

[0033] Furthermore, it also includes a fresh air valve 15, an air supply valve 16 and a regeneration air valve 17, the fresh air valve 15 is arranged between the air inlet end of the fresh air path 1 and the primary filter 10; the air supply valve 16 is arranged between the rear surface cooler 9 and the exhaust end of the fresh air path 1; the regeneration air valve 17 is arranged between the connecting position of the regeneration air path 2 and the fresh air path 1 and the rear impeller 6.

[0034] It can be seen from the above description that the corresponding air paths can be opened or closed by setting the fresh air valve 15 , the supply air valve 16 and the regeneration air valve 17 .

[0035] Furthermore, it also includes a front regeneration heater 18 and a rear regeneration heater 19, the front regeneration heater 18 is arranged on the regeneration air path 2 between the front wheel 5 and the rear wheel 6; the rear regeneration heater 19 is arranged between the rear wheel 6 and the connecting position between the regeneration air path 2 and the fresh air path 1.

[0036] From the above description, it can be seen that the regeneration air sent to the first wheel and the second wheel is heated by the front regeneration heater 18 and the rear regeneration heater 19 respectively so that it can exchange heat with the first wheel and the second wheel, so that the first wheel and the second wheel can rotate to heat and dehumidify the fresh air.

[0037] Embodiment 1 is:

[0038] Application scenario: In different seasons, the humidity content of outdoor fresh air is different, which leads to the situation that the humidity content of the regenerative heat exhaust air of the low-temperature refrigeration dehumidifier is lower than that of the outdoor fresh air in some time periods. In this way, the regenerative heat exhaust air has a certain value of moisture recovery or heat recovery. In common designs, the regenerative heat exhaust air is directly discharged from the dehumidifier as exhaust air, which wastes energy and cannot be effectively recycled.

[0039] like Figure 1 As shown, the low-temperature refrigeration dehumidifier with automatic fresh air optimization of this embodiment includes a fresh air path 1, a regeneration air path 2, a first return air path 3, a second return air path 4, a front impeller 5, a rear impeller 6, a front surface cooler 7, a middle surface cooler 8, a rear surface cooler 9, a primary filter 10, a middle filter 11, a first-level supply fan 12, a second-level supply fan 13, a regeneration fan 14, a fresh air valve 15, an air supply valve 16, a regeneration air valve 17, a front regeneration heater 18, a rear regeneration heater 19 and a fresh air automatic optimization component 4.

[0040] The fresh air passage 1 is connected with the regeneration air passage 2; one end of the first return air passage 3 is connected with the exhaust end of the regeneration air passage 2, and the other end is respectively connected with the outside and the air inlet end of the fresh air passage 1; one end of the second return air passage 4 is connected with the exhaust end of the fresh air passage 1, and the other end is connected with the front section of the fresh air passage 1 corresponding to the connecting position between the regeneration air passage 2 and the fresh air passage 1.

[0041] The fresh air passage 1 and the regeneration air passage 2 both pass through the front rotor 5 and the rear rotor 6 in sequence; the connecting position of the fresh air passage 1 and the regeneration air passage 2 is located between the front rotor 5 and the rear rotor 6.

[0042] The front surface cooler 7 is arranged between the air inlet end of the fresh air passage 1 and the front impeller 5; the connecting position between the second return air passage 4 and the fresh air passage 1, the connecting position between the regeneration air passage 2 and the fresh air passage 1 and the middle surface cooler 8 are sequentially arranged on the fresh air passage 1 between the front impeller 5 and the rear impeller 6; the rear surface cooler 9 is arranged between the rear impeller 6 and the exhaust end of the fresh air passage 1.

[0043] The primary filter 10 is arranged between the air inlet end of the fresh air passage 1 and the front surface cooler 7 ; the medium efficiency filter 11 is arranged between the middle surface cooler 8 and the rear impeller 6 .

[0044] The first-stage air supply fan 12 is arranged on the fresh air path 1 between the front impeller 5 and the rear impeller 6; the second-stage air supply fan 13 is arranged between the rear impeller 6 and the exhaust end of the fresh air path 1; the regeneration fan 14 is arranged between the exhaust end of the regeneration air path 2 and the front impeller 5.

[0045] The fresh air valve 15 is arranged between the air inlet end of the fresh air passage 1 and the primary filter 10; the air supply valve 16 is arranged between the rear surface cooler 9 and the exhaust end of the fresh air passage 1; the regeneration air valve 17 is arranged between the connecting position of the regeneration air passage 2 and the fresh air passage 1 and the rear impeller 6.

[0046] The front regeneration heater 18 is arranged on the regeneration air path 2 between the front impeller 5 and the rear impeller 6 ; the rear regeneration heater 19 is arranged between the rear impeller 6 and the connection position between the regeneration air path 2 and the fresh air path 1 .

[0047] The fresh air automatic optimization component 4 includes a controller, a first air valve 41, a second air valve 42, a first temperature and humidity sensor 43, and a second temperature and humidity sensor 44. The first air valve 41 is arranged at the connecting section between one end of the first return air passage 3 and the outside, and the second air valve 42 is arranged at the connecting section between one end of the first return air passage 3 and the air inlet end of the fresh air passage 1; the first temperature and humidity sensor 43 is arranged at the exhaust end of the regeneration air passage 2, and the second temperature and humidity sensor 44 is arranged at the air inlet end of the fresh air passage 1; the controller is electrically connected to the first air valve 41, the second air valve 42, the first temperature and humidity sensor 43, and the second temperature and humidity sensor 44. The connecting section between one end of the first return air passage 3 and the outside and the air inlet end of the fresh air passage 1 is selectively opened or closed through the fresh air automatic optimization component 4.

[0048] Working principle: the fresh air passes through the fresh air valve 15, the primary filter 10, the front surface cooler 7, and the front impeller 5 in sequence for filtering, cooling, and dehumidification; then it passes through the first-level air supply fan 12, and a part of the fresh air passes through the middle surface cooler 8, the middle efficiency filter 11, and the rear impeller 6 for secondary filtering, cooling, and dehumidification, and is transported by the second-level air supply fan 13 to the rear surface cooler 9 for cooling, and finally forms the supply air with suitable temperature and humidity, and enters the room through the supply air valve 16; the indoor return air is discharged into the fresh air path 1 to participate in the next fresh air treatment; the other part of the fresh air is used as regeneration exhaust air, and is heated by the regeneration air valve 17 and the rear regeneration heater 19 to exchange temperature and humidity with the rear impeller 6, and is heated by the front regeneration heater 18 to exchange temperature and humidity with the front impeller 5, and finally is sent to the first return air path 3 through the regeneration fan 14.

[0049] In the first return air path 3, the exhaust air at the exhaust end of the regeneration air path 2, that is, the exhaust air sent by the regeneration fan 14, is collected for temperature and humidity through the first temperature and humidity sensor 43, and the temperature and humidity of the air inlet end of the fresh air path 1 is collected through the second temperature and humidity sensor 44, and the controller determines the appropriate air source after comparison and calculation. If the temperature and humidity of the regeneration heat exhaust air is better than the temperature and humidity of the fresh air, the first air valve 41 is controlled to be closed to prevent the regeneration heat exhaust air from being discharged to the outside from the first return air path 3, and the second air valve 42 is controlled to be opened to guide the regeneration heat exhaust air to be sent to the air inlet end of the fresh air path 1 to participate in the fresh air processing; on the contrary, the first air valve 41 is opened, the second air valve 42 is closed, and the regeneration heat exhaust air is discharged to the outside normally.

[0050] To summarize, the low-temperature refrigeration dehumidifier with automatic fresh air optimization provided by the utility model can control the connection and cutoff of different connecting parts on the first return air path through the automatic fresh air optimization component, so that when the exhaust air moisture content of the regeneration air path is less than the inlet air moisture content of the fresh air path, the regeneration air path and the outside air path are cut off, the air path at the air inlet end of the regeneration air path and the fresh air path are connected, and the exhaust air of the regeneration air path is introduced into the fresh air path, so as to be recycled and utilized, thereby reducing the subsequent dehumidification energy consumption; on the contrary, when the exhaust air moisture content of the regeneration air path is greater than the inlet air moisture content of the fresh air path, the regeneration air path and the outside air path are connected, the air path at the air inlet end of the regeneration air path and the fresh air path are cut off, and the fresh air is directly introduced into the fresh air path for dehumidification treatment.

[0051] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A low-temperature refrigeration dehumidifier with automatic optimization of fresh air, characterized in that: It includes a fresh air duct, a regeneration air duct, a first return air duct and a fresh air automatic optimization component, the fresh air duct is connected with the regeneration air duct; one end of the first return air duct is connected with the exhaust end of the regeneration air duct, and the other end is respectively connected with the outside world and the air inlet end of the fresh air duct; the fresh air automatic optimization component selectively opens or cuts off the connecting section between one end of the first return air duct and the outside world and the air inlet end of the fresh air duct.

2. The low-temperature refrigeration dehumidifier with automatic fresh air optimization according to claim 1 is characterized in that: The fresh air automatic optimization component includes a controller, a first air valve, a second air valve, a first temperature and humidity sensor, and a second temperature and humidity sensor. The first air valve is arranged at a connecting section between one end of the first return air passage and the outside world, and the second air valve is arranged at a connecting section between one end of the first return air passage and the air inlet end of the fresh air passage; the first temperature and humidity sensor is arranged at the exhaust end of the regeneration air passage, and the second temperature and humidity sensor is arranged at the air inlet end of the fresh air passage; the controller is electrically connected to the first air valve, the second air valve, the first temperature and humidity sensor, and the second temperature and humidity sensor.

3. The low-temperature refrigeration dehumidifier with automatic fresh air optimization according to claim 1 is characterized in that: It also includes a second return air duct, one end of which is connected to the exhaust end of the fresh air duct, and the other end is connected to the front section of the fresh air duct corresponding to the connection position between the regeneration air duct and the fresh air duct.

4. The low-temperature refrigeration dehumidifier with automatic fresh air optimization according to claim 3 is characterized in that: It also includes a front wheel and a rear wheel, and the fresh air path and the regeneration air path both pass through the front wheel and the rear wheel in sequence; the connecting position of the fresh air path and the regeneration air path is located between the front wheel and the rear wheel.

5. The low-temperature refrigeration dehumidifier with automatic fresh air optimization according to claim 4 is characterized in that: It also includes a front surface cooler, a middle surface cooler and a rear surface cooler. The front surface cooler is arranged between the air inlet end of the fresh air duct and the front impeller; the fresh air duct between the front impeller and the rear impeller is sequentially provided with a connecting position between the second return air duct and the fresh air duct, a connecting position between the regeneration air duct and the fresh air duct, and a middle surface cooler; the rear surface cooler is arranged between the rear impeller and the exhaust end of the fresh air duct.

6. The low-temperature refrigeration dehumidifier with automatic fresh air optimization according to claim 5, characterized in that: It also includes a primary filter and a medium filter. The primary filter is arranged between the air inlet end of the fresh air path and the front surface cooler; the medium filter is arranged between the middle surface cooler and the rear impeller.

7. The low-temperature refrigeration dehumidifier with automatic fresh air optimization according to claim 6, characterized in that: It also includes a primary air supply fan, a secondary air supply fan and a regeneration fan. The primary air supply fan is arranged on the fresh air path between the front impeller and the rear impeller; the secondary air supply fan is arranged between the rear impeller and the exhaust end of the fresh air path; the regeneration fan is arranged between the exhaust end of the regeneration air path and the front impeller.

8. The low-temperature refrigeration dehumidifier with automatic fresh air optimization according to claim 6, characterized in that: It also includes a fresh air valve, an air supply valve and a regeneration air valve. The fresh air valve is arranged between the air inlet end of the fresh air passage and the primary filter; the air supply valve is arranged between the rear surface cooler and the exhaust end of the fresh air passage; the regeneration air valve is arranged between the connecting position of the regeneration air passage and the fresh air passage and the rear impeller.

9. The low-temperature refrigeration dehumidifier with automatic fresh air optimization according to claim 1, characterized in that: It also includes a front regeneration heater and a rear regeneration heater. The front regeneration heater is arranged on the regeneration air path between the front wheel and the rear wheel; the rear regeneration heater is arranged between the rear wheel and the connecting position between the regeneration air path and the fresh air path.

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