Heat recovery air conditioning unit

Abstract

The utility model provides a heat recovery air conditioning unit which comprises a dehumidification air duct, a heat recovery air duct, a processing cavity, an evaporator, a condenser and a compressor, the evaporator, the condenser and the compressor are connected through a circulating pipeline, the evaporator is located in the dehumidification air duct, the dehumidification air duct is communicated with the processing cavity, and the condenser and the compressor are located in the heat recovery air duct; wherein the evaporator is located between the fresh air inlet of the dehumidification air duct and the processing cavity, and the condenser is located between the fresh air inlet of the heat recovery air duct and the processing cavity. According to the scheme, the evaporator cools and dehumidifies the fresh air entering the dehumidification air duct, the dehumidified fresh air enters the processing cavity, the condenser heats the fresh air entering the heat recovery air duct, and the heated fresh air is used for heating the dehumidified fresh air in the processing cavity, so that heat generated by the condenser is recovered, and the heat recovery efficiency is improved. Therefore, an electric heating mode can be replaced to heat the fresh air or reduce the electricity consumption of electric heating. By means of the scheme, the problem that in the prior art, an air conditioning unit is high in power consumption is solved, and energy and operation cost are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of air-conditioning equipment, and in particular to a heat recovery air-conditioning unit. Background Art

[0002] In some industrial production, medical, laboratory and other occasions, fresh air needs to be input, and the humidity of the fresh air is required to be low, and there are also requirements for the temperature of the input fresh air. In the prior art, an air conditioning unit is used to adjust the humidity and temperature of the fresh air, and then the fresh air is input to the use occasion or input to other devices for further processing before use.

[0003] In the prior art, when using an air conditioning unit to process fresh air, the fresh air is first cooled by an evaporator. During the cooling process, the moisture in the fresh air is condensed and discharged, thereby achieving dehumidification. However, the temperature of the fresh air after dehumidification is relatively low, which often cannot meet the temperature requirements of the use occasion. It is also necessary to use an electric heating component to heat the dehumidified incoming air. This heating method consumes a lot of electricity and has poor energy saving performance. Utility Model Content

[0004] The utility model provides a heat recovery air-conditioning unit, comprising a dehumidification air duct, a heat recovery air duct, a processing chamber, and an evaporator, a condenser, and a compressor connected by a circulation pipeline, the evaporator is located in the dehumidification air duct, the dehumidification air duct and the processing chamber are connected, the condenser and the compressor are located in the heat recovery air duct, the heat recovery air duct and the processing chamber are connected or not connected, and the dehumidification air duct and the heat recovery air duct are not directly connected; wherein the evaporator is located between a first fresh air inlet of the dehumidification air duct and the processing chamber, the condenser is located between a second fresh air inlet of the heat recovery air duct and the processing chamber, the processing chamber is provided with a fresh air outlet, and when the heat recovery air duct is connected to the processing chamber, the first fresh air inlet and the second fresh air inlet are respectively connected to the fresh air outlet.

[0005] Furthermore, the heat recovery air conditioning unit also includes a first valve, the heat recovery air duct has an air outlet, the first valve is arranged at the air outlet, the first valve is used to adjust the opening of the air outlet and open and close the air outlet, and the heat recovery air duct is connected and disconnected with the processing chamber through the air outlet.

[0006] Furthermore, the heat recovery air conditioning unit also includes a second valve, the heat recovery air duct has an exhaust port, the exhaust port is located between the condenser and the air outlet, the exhaust port and the air outlet are arranged at an angle, the second valve is arranged at the exhaust port, the second valve is used to adjust the opening of the exhaust port and open and close the exhaust port, and the heat recovery air duct is connected and disconnected with the external environment through the exhaust port.

[0007] Alternatively, the heat recovery air conditioning unit further comprises a heat exchange pipe, the air outlet of the heat recovery air duct is connected to the inlet of the heat exchange pipe, the heat exchange pipe is spirally or serpentinely arranged in the processing chamber, and the outlet of the heat exchange pipe is located outside the processing chamber.

[0008] Furthermore, the heat recovery air duct has an exhaust outlet, which is located between the condenser and the air outlet, and the exhaust outlet is set at an angle to the air outlet. The heat recovery air-conditioning unit also includes a first valve and a second valve, the first valve is set at the air outlet, and the second valve is set at the exhaust outlet. The first valve is used to adjust the opening of the air outlet and open and close the air outlet, and the heat recovery air duct is connected and disconnected with the heat exchange pipe through the air outlet, and the second valve is used to adjust the opening of the exhaust outlet and open and close the exhaust outlet, and the heat recovery air duct is connected and disconnected with the external environment through the exhaust outlet.

[0009] Furthermore, the first valve and the second valve are both electric valves, and the heat recovery air-conditioning unit also includes a controller. The compressor, the first valve, and the second valve are all electrically connected to the controller, and the controller controls the working power of the compressor and the opening of the first valve and the second valve; wherein, when the opening of the first valve is increased, the opening of the second valve is decreased, and when the opening of the first valve is decreased, the opening of the second valve is increased.

[0010] Furthermore, the heat recovery air conditioning unit also includes an openable and closable electric heating unit, which is arranged in the processing chamber and close to the fresh air outlet, and the fresh air outlet is located on the side of the electric heating unit away from the dehumidification air duct.

[0011] Furthermore, the heat recovery air conditioning unit also includes a surface cooler, which is arranged in the dehumidification air duct, and the surface cooler is connected to an external cooling water source through a pipeline, and the surface cooler is located between the first fresh air inlet and the evaporator.

[0012] Furthermore, the heat recovery air conditioning unit also includes a first fan and a second fan. The first fan is arranged in the dehumidification air duct, and the first fan is located between the evaporator and the processing chamber. The second fan is arranged in the heat recovery air duct, and the second fan is located between the condenser and the processing chamber. Both the first fan and the second fan are variable frequency fans.

[0013] Furthermore, the heat recovery air conditioning unit also includes a first filter part and a second filter part, the first filter part is arranged at the first fresh air inlet, and the second filter part is arranged at the second fresh air inlet.

[0014] Furthermore, the heat recovery air-conditioning unit also includes a throttling component, which is arranged on the circulation pipeline, a temperature sensor and / or a humidity sensor is arranged in the dehumidification air duct, a temperature sensor is arranged in the heat recovery air duct, and a temperature sensor and / or a humidity sensor is arranged in the processing chamber. The heat recovery air-conditioning unit also includes a controller, and the compressor, throttling component, temperature sensor, and humidity sensor are all electrically connected to the controller.

[0015] The technical solution of the utility model is applied to provide a heat recovery air conditioning unit, including a dehumidification air duct, a heat recovery air duct, a processing chamber, and an evaporator, a condenser, and a compressor connected by a circulation pipeline. The evaporator is located in the dehumidification air duct, the dehumidification air duct is connected to the processing chamber, and the condenser is located in the heat recovery air duct; wherein the evaporator cools and dehumidifies the fresh air entering the dehumidification air duct, the dehumidified fresh air enters the processing chamber, the condenser heats the fresh air entering the heat recovery air duct, and the heated fresh air is used to heat the dehumidified fresh air in the processing chamber. In this solution, the fresh air can be dehumidified by absorbing heat and cooling by the evaporator. While the evaporator absorbs heat, the condenser needs to release heat to achieve continuous operation of the unit. The heat generated by the condenser heat release will heat the fresh air passing through the condenser, and the heated fresh air is used to heat the dehumidified fresh air in the processing chamber, so that the heat generated by the condenser is recovered, so that the fresh air can be heated instead of the electric heating method or the power consumption of the electric heating can be reduced. Therefore, through this solution, the problem of high power consumption of the air conditioning unit in the prior art is solved, and energy and operating costs are saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 The schematic diagram of the structure of the heat recovery air conditioning unit provided by the embodiment of the utility model is shown.

[0018] The above drawings include the following reference numerals:

[0019] 11. Dehumidification air duct;

[0020] 12. Heat recovery duct;

[0021] 13. Processing chamber;

[0022] 21. Evaporator;

[0023] 22. Condenser;

[0024] 23. Compressor;

[0025] 24. Throttling components;

[0026] 31. First valve;

[0027] 32. Second valve;

[0028] 40. Electric heating unit;

[0029] 51. Surface cooler;

[0030] 52. External cooling water source;

[0031] 61. First fan;

[0032] 62. Second fan;

[0033] 71. A first filter unit;

[0034] 72. Second filter unit. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0036] like Figure 1 As shown, an embodiment of the utility model provides a heat recovery air-conditioning unit, including a dehumidification air duct 11, a heat recovery air duct 12, a processing chamber 13, and an evaporator 21, a condenser 22, and a compressor 23 connected by a circulation pipeline, the evaporator 21 is located in the dehumidification air duct 11, the dehumidification air duct 11 and the processing chamber 13 are connected, the condenser 22 and the compressor 23 are located in the heat recovery air duct 12, the heat recovery air duct 12 and the processing chamber 13 are connected or not connected, and the dehumidification air duct 11 is not directly connected to the heat recovery air duct 12; wherein, the evaporator 21 is located between the first fresh air inlet of the dehumidification air duct 11 and the processing chamber 13, the condenser 22 is located between the second fresh air inlet of the heat recovery air duct 12 and the processing chamber 13, and the processing chamber 13 is provided with a fresh air outlet. When the heat recovery air duct 12 is connected to the processing chamber 13, the first fresh air inlet and the second fresh air inlet are respectively connected to the fresh air outlet.

[0037] In this solution, the fresh air can be dehumidified by absorbing heat and cooling the evaporator 21. While the evaporator 21 absorbs heat, the condenser 22 needs to release heat to achieve continuous operation of the unit. The heat generated by the condenser 22 heats the fresh air passing through the condenser 22, and the heated fresh air is used to heat the dehumidified fresh air in the processing chamber 13, thus realizing the recovery of the heat generated by the condenser 22, thereby replacing the electric heating method to heat the fresh air or reducing the power consumption of the electric heating. Therefore, through this solution, the problem of high power consumption of the air conditioning unit in the prior art is solved, saving energy and operating costs.

[0038] In this solution, the dehumidification air duct 11 and the heat recovery air duct 12 are not directly connected to avoid affecting the dehumidification effect. The heat recovery air duct 12 has an air outlet, which is connected to the processing chamber 13 to input the heated fresh air into the processing chamber 13. In this way, the fresh air heated by the condenser 22 enters the processing chamber 13 and mixes with the dehumidified low-temperature fresh air entering from the dehumidification air duct 11, thereby heating the dehumidified fresh air. In this way, the heating efficiency is high and the heat recovery rate of the condenser 22 is high.

[0039] like Figure 1 As shown, the heat recovery air conditioning unit further includes a first valve 31. The heat recovery air duct 12 has an air outlet. The first valve 31 is disposed at the air outlet. The first valve 31 is used to adjust the opening of the air outlet and to open and close the air outlet. The heat recovery air duct 12 is connected to the processing chamber 13 through the air outlet. By adjusting the first valve 31, the amount of heated fresh air entering the processing chamber 13 can be adjusted, thereby adjusting the heating temperature of the fresh air in the processing chamber 13.

[0040] For example, when the required heating temperature of the fresh air in the processing chamber 13 is higher, the opening of the first valve 31 is increased; when the required heating temperature of the fresh air in the processing chamber 13 is lower, the opening of the first valve 31 is reduced; when the fresh air in the processing chamber 13 does not need to be heated, the first valve 31 is closed.

[0041] Furthermore, the heat recovery air conditioning unit also includes a second valve 32. The heat recovery air duct 12 has an exhaust port, which is located between the condenser 22 and the air outlet. The exhaust port and the air outlet are arranged at an angle. The second valve 32 is arranged at the exhaust port. The second valve 32 is used to adjust the opening of the exhaust port and open and close the exhaust port. The heat recovery air duct 12 is connected and disconnected with the external environment through the exhaust port.

[0042] When the air conditioning unit is working, it is necessary to continuously cool the condenser 22 with fresh air. When the processing chamber 13 only needs a portion of the heated fresh air or does not need to heat the fresh air, the excess heated fresh air is discharged to the external environment through the exhaust port, which can prevent the heat recovery air duct 12 from being pressurized and ensure the cooling effect on the condenser 22. The opening of the second valve 32 is coordinated with the opening of the first valve 31 for adjustment.

[0043] Among them, the first valve 31 and the second valve 32 are both electric valves. The heat recovery air-conditioning unit also includes a controller. The compressor 23, the first valve 31, and the second valve 32 are all electrically connected to the controller. The controller controls the working power of the compressor 23 and the opening of the first valve 31 and the second valve 32.

[0044] By controlling the operating power of the compressor 23, the dehumidification efficiency of the evaporator 21 for the fresh air and the heating efficiency of the condenser 22 for the fresh air can be adjusted. The compressor 23 can be a variable frequency compressor. The opening of the second valve 32 and the opening of the first valve 31 are adjusted in coordination. When the opening of the first valve 31 is adjusted to a large extent, the opening of the second valve 32 is adjusted to a small extent. When the opening of the first valve 31 is adjusted to a small extent, the opening of the second valve 32 is adjusted to a large extent. In this way, the cooling effect on the condenser 22 is ensured, and a suitable pressure is provided in the heat recovery air duct 12.

[0045] In some embodiments not shown in the figure, the heat recovery air conditioning unit further includes a heat exchange pipe, the air outlet of the heat recovery air duct 12 is connected to the inlet of the heat exchange pipe, the heat exchange pipe is spirally or serpentinely arranged in the processing chamber 13, and the outlet of the heat exchange pipe is located outside the processing chamber 13. That is, the fresh air heated in the heat recovery air duct 12 is transported to the heat exchange pipe, and the dehumidified fresh air in the processing chamber 13 is heated by the heat exchange pipe.

[0046] In this way, the heated fresh air in the heat exchange tube heats the fresh air in the processing chamber 13 in a non-contact manner. In this way, the processing chamber 13 will not be filled with fresh air that has not been dehumidified, which is conducive to maintaining a low humidity of the fresh air in the processing chamber 13. The heat exchange tube is arranged in a spiral or serpentine shape, which can increase the heat exchange area and improve the heat exchange effect.

[0047] Furthermore, the heat recovery air duct 12 has an exhaust port, which is located between the condenser 22 and the air outlet, and the exhaust port is set at an angle to the air outlet. The heat recovery air conditioning unit also includes a first valve 31 and a second valve 32. The first valve 31 is set at the air outlet, and the second valve 32 is set at the air outlet. The first valve 31 is used to adjust the opening of the air outlet and open and close the air outlet. The heat recovery air duct 12 is connected and disconnected with the heat exchange pipe through the air outlet, and the second valve 32 is used to adjust the opening of the exhaust port and open and close the exhaust port. The heat recovery air duct 12 is connected and disconnected with the external environment through the exhaust port.

[0048] In this way, by adjusting the opening of the first valve 31, the amount of heated fresh air entering the heat exchange tube can be adjusted, thereby adjusting the heating temperature of the fresh air in the processing chamber 13. When the processing chamber 13 only needs a part of the heated fresh air for heating or does not need to be heated by the heated fresh air, the excess heated fresh air is discharged to the external environment through the exhaust port, which can prevent the heat recovery air duct 12 from being pressurized and ensure the cooling effect on the condenser 22. Among them, the opening of the second valve 32 is adjusted in coordination with the opening of the first valve 31.

[0049] like Figure 1As shown, the heat recovery air conditioning unit further includes an openable and closable electric heating unit 40, which is arranged in the processing chamber 13 and is arranged near the fresh air outlet. The electric heating unit 40 is used to heat the fresh air in the processing chamber 13. When the fresh air heated by the condenser 22 cannot meet the temperature requirement for the fresh air in the processing chamber 13, the electric heating unit 40 is turned on for further heating. Compared with directly using electric heating, this not only meets the temperature requirement for the fresh air, but also reduces the power consumption of electric heating, thereby saving energy.

[0050] In addition, the processing chamber 13 has a fresh air outlet, which is located on the side of the electric heating part 40 away from the dehumidification air duct 11. After the fresh air in the processing chamber 13 is adjusted to a suitable humidity and temperature, the fresh air outlet outputs the fresh air to other devices or spaces for use.

[0051] Furthermore, the heat recovery air conditioning unit further includes a surface cooler 51, which is disposed in the dehumidification air duct 11, between the first fresh air inlet of the dehumidification air duct 11 and the evaporator 21, and is connected to an external cooling water source 52 through a pipeline, and the temperature of the water source is generally about 7° C. The surface cooler 51 cools and dehumidifies the fresh air entering the dehumidification air duct 11.

[0052] The water with lower temperature in the external cooling water source 52 flows into the surface cooler 51, and the surface cooler 51 contacts the fresh air entering the dehumidification air duct 11 to cool and dehumidify the fresh air. Therefore, the dehumidification capacity of the fresh air is improved by the setting of the surface cooler 51, and the cooling method of water cooling is adopted to reduce the power consumption. The cooling water flow in the surface cooler 51 can be adjusted according to the cooling needs.

[0053] like Figure 1 As shown, the heat recovery air conditioning unit also includes a first fan 61 and a second fan 62. The first fan 61 is arranged in the dehumidification air duct 11, and the first fan 61 is located between the evaporator 21 and the processing chamber 13. The second fan 62 is arranged in the heat recovery air duct 12, and the second fan 62 is located between the condenser 22 and the processing chamber 13. The first fan 61 and the second fan 62 are both variable frequency fans. The fan can speed up the flow of fresh air and improve the heat exchange effect. With a variable frequency fan, the wind speed can be adjusted as needed to adjust the heat exchange efficiency.

[0054] In this solution, the heat recovery air conditioning unit further includes a first filter 71 and a second filter 72. The first filter 71 is arranged at the first fresh air inlet of the dehumidification air duct 11, and the second filter 72 is arranged at the second fresh air inlet of the heat recovery air duct 12. By setting the filter, the fresh air entering the dehumidification air duct 11 and the heat recovery air duct 12 can be filtered to prevent impurities, dust, and bacteria from entering the air duct.

[0055] Among them, the filter part includes multiple layers of filter screens, and the number and pores of the filter screens are set according to the requirements of the use occasions. For example, primary efficiency, primary-medium efficiency, sub-high efficiency, high efficiency and other filter levels can be set to meet the cleanliness requirements.

[0056] In this solution, the heat recovery air conditioning unit further includes a throttling component 24, which is arranged on the circulation pipeline, and the throttling component 24 can be an electronic expansion valve, a capillary tube, etc. A temperature sensor and / or a humidity sensor is arranged in the dehumidification air duct 11, a temperature sensor is arranged in the heat recovery air duct 12, and a temperature sensor and / or a humidity sensor is arranged in the processing chamber 13. The heat recovery air conditioning unit further includes a controller, and the compressor 23, the throttling component 24, the temperature sensor, and the humidity sensor are all electrically connected to the controller.

[0057] When in use, the controller controls the operation of the compressor 23, the throttling component 24 and other components according to the temperature and humidity detection results and the temperature and humidity values ​​set by the user to meet the user's demand for fresh air. For example, the target temperature of the fresh air after cooling and dehumidification in the dehumidification air duct 11 can be set to 1-30°C. The target temperature of the heated fresh air in the heat recovery air duct 12 can be set to 30-65°C.

[0058] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0059] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0060] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being only exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0061] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0062] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0063] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only to facilitate the distinction between corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

Claims

1. A heat recovery air conditioning unit, characterized in that: The invention comprises a dehumidification air duct (11), a heat recovery air duct (12), a processing chamber (13), and an evaporator (21), a condenser (22), and a compressor (23) connected by a circulation pipeline, wherein the evaporator (21) is located in the dehumidification air duct (11), the dehumidification air duct (11) and the processing chamber (13) are connected, the condenser (22) and the compressor (23) are located in the heat recovery air duct (12), the heat recovery air duct (12) and the processing chamber (13) are connected or not connected, and the dehumidification air duct ( 11) is not directly connected to the heat recovery air duct (12); wherein the evaporator (21) is located between the first fresh air inlet of the dehumidification air duct (11) and the processing chamber (13), the condenser (22) is located between the second fresh air inlet of the heat recovery air duct (12) and the processing chamber (13), and the processing chamber (13) is provided with a fresh air outlet. When the heat recovery air duct (12) is connected to the processing chamber (13), the first fresh air inlet and the second fresh air inlet are respectively connected to the fresh air outlet.

2. The heat recovery air conditioning unit according to claim 1, characterized in that: The heat recovery air conditioning unit further comprises a first valve (31); the heat recovery air duct (12) has an air outlet; the first valve (31) is arranged at the air outlet; the first valve (31) is used to adjust the opening of the air outlet and to open and close the air outlet; the heat recovery air duct (12) is connected and disconnected with the processing chamber (13) via the air outlet.

3. The heat recovery air conditioning unit according to claim 2, characterized in that: The heat recovery air conditioning unit further comprises a second valve (32); the heat recovery air duct (12) has an exhaust port, the exhaust port is located between the condenser (22) and the air outlet, the exhaust port is arranged at an angle to the air outlet, the second valve (32) is arranged at the exhaust port, the second valve (32) is used to adjust the opening of the exhaust port and open and close the exhaust port, and the heat recovery air duct (12) is connected and disconnected with the external environment through the exhaust port.

4. The heat recovery air conditioning unit according to claim 1, characterized in that: The heat recovery air conditioning unit also includes a heat exchange pipe, the air outlet of the heat recovery air duct (12) is connected to the inlet of the heat exchange pipe, the heat exchange pipe is arranged in a spiral or serpentine shape in the processing chamber (13), and the outlet of the heat exchange pipe is located outside the processing chamber (13).

5. The heat recovery air conditioning unit according to claim 4, characterized in that: The heat recovery air duct (12) has an exhaust port, the exhaust port is located between the condenser (22) and the air outlet, and the exhaust port is arranged at an angle with the air outlet. The heat recovery air conditioning unit also includes a first valve (31) and a second valve (32), the first valve (31) is arranged at the air outlet, and the second valve (32) is arranged at the air outlet. The first valve (31) is used to adjust the opening of the air outlet and open and close the air outlet. The heat recovery air duct (12) is connected and disconnected with the heat exchange pipe through the air outlet, and the second valve (32) is used to adjust the opening of the air outlet and open and close the air outlet. The heat recovery air duct (12) is connected and disconnected with the external environment through the air outlet.

6. The heat recovery air conditioning unit according to claim 3 or 5, characterized in that: The first valve (31) and the second valve (32) are both electric valves. The heat recovery air conditioning unit further comprises a controller. The compressor (23), the first valve (31), and the second valve (32) are all electrically connected to the controller. The controller controls the working power of the compressor (23) and the openings of the first valve (31) and the second valve (32). When the opening of the first valve (31) is increased, the opening of the second valve (32) is decreased. When the opening of the first valve (31) is decreased, the opening of the second valve (32) is increased.

7. The heat recovery air conditioning unit according to any one of claims 1 to 5, characterized in that: The heat recovery air conditioning unit further comprises an openable and closable electric heating unit (40), wherein the electric heating unit (40) is arranged in the processing chamber (13), and the electric heating unit (40) is arranged close to the fresh air outlet, wherein the fresh air outlet is located on a side of the electric heating unit (40) away from the dehumidification air duct (11).

8. The heat recovery air conditioning unit according to claim 7, characterized in that: The heat recovery air conditioning unit further comprises a surface cooler (51), wherein the surface cooler (51) is arranged in the dehumidification air duct (11), the surface cooler (51) is connected to an external cooling water source (52) via a pipeline, and the surface cooler (51) is located between the first fresh air inlet and the evaporator (21).

9. The heat recovery air conditioning unit according to claim 1, characterized in that: The heat recovery air conditioning unit further comprises a first fan (61) and a second fan (62); the first fan (61) is arranged in the dehumidification air duct (11); the first fan (61) is located between the evaporator (21) and the processing chamber (13); the second fan (62) is arranged in the heat recovery air duct (12); the second fan (62) is located between the condenser (22) and the processing chamber (13); the first fan (61) and the second fan (62) are both variable frequency fans.

10. The heat recovery air conditioning unit according to claim 1, characterized in that: The heat recovery air conditioning unit further comprises a first filter part (71) and a second filter part (72), wherein the first filter part (71) is arranged at the first fresh air inlet, and the second filter part (72) is arranged at the second fresh air inlet.

11. The heat recovery air conditioning unit according to claim 1, characterized in that: The heat recovery air conditioning unit further comprises a throttling component (24), wherein the throttling component (24) is arranged on the circulation pipeline, a temperature sensor and / or a humidity sensor is arranged in the dehumidification air duct (11), a temperature sensor is arranged in the heat recovery air duct (12), and a temperature sensor and / or a humidity sensor is arranged in the processing chamber (13). The heat recovery air conditioning unit further comprises a controller, and the compressor (23), the throttling component (24), the temperature sensor, and the humidity sensor are all electrically connected to the controller.

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