A fresh air exchange device suitable for cold storage

Abstract

This utility model relates to a fresh air exchange device suitable for cold storage warehouses. By setting up a fresh air temperature and humidity regulating unit outside the cold storage warehouse, and sequentially setting up a fresh air temperature regulating condenser in parallel with the main condenser of the refrigeration system and a fresh air temperature regulating evaporator in parallel with the main evaporator within this module, the temperature of the fresh air can be more precisely regulated, and the energy consumption of the ventilation regulation system can be reduced by utilizing the heat or cold energy of the refrigeration system. After setting up the fresh air temperature regulating condenser and the fresh air temperature regulating evaporator, an isenthalpic humidifier and an isothermal humidifier can be set up to regulate the humidity of the fresh air more precisely. This allows the cold storage warehouse to meet its humidity requirements without burdening the refrigeration unit, and reduces the impact on temperature while regulating humidity. It also avoids a series of problems caused by excessive temperature and humidity fluctuations during ventilation in the cold storage warehouse.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and in particular to a fresh air exchange device suitable for cold storage. Background Technology

[0002] Cold storage facilities for fruits, vegetables, and dairy products require regular air exchange based on the characteristics of the refrigerated goods. For example, fruits and vegetables stored in cold storage facilities produce gases such as ethylene, which can cause them to spoil and rot. Therefore, the shelf life of fruits and vegetables in cold storage is generally around 7-10 days; beyond this time, they will spoil and rot. Dairy product cold storage facilities have specific requirements for the concentration and humidity of carbon dioxide in the air. Excessive carbon dioxide concentration will cause dairy products to spoil or develop an off-odor. Spoilage and decay of refrigerated goods in cold storage facilities will result in significant waste and economic losses.

[0003] Therefore, cold storage facilities requiring ventilation typically incorporate refrigeration systems as ventilation devices. Existing refrigeration systems directly exhaust air from the cold storage and introduce fresh outside air, resulting in significant fluctuations in temperature and humidity. On one hand, this fails to meet the demand for stable temperature and humidity control required in specific cold storage scenarios. On the other hand, to quickly reach the set temperature and humidity levels, the compressor operates at high frequency for extended periods to provide sufficient cooling, leading to high energy consumption. Increased frosting speed and intensity on the evaporator necessitates frequent defrosting, potentially causing liquid slugging or even compressor damage. Utility Model Content

[0004] Based on this, the purpose of this utility model is to provide a fresh air exchange device suitable for cold storage, so as to solve the problems of large fluctuations in temperature and humidity in cold storage, resulting in unacceptable temperature and humidity, increased energy consumption of refrigeration system, and high risk of compressor failure and damage.

[0005] A fresh air exchange device suitable for cold storage includes:

[0006] The refrigeration unit includes a compressor, a main condenser, and a main evaporator connected in sequence via refrigerant circulation piping.

[0007] The fresh air heat exchange unit includes a gas-to-gas heat exchanger; wherein the gas-to-gas heat exchanger includes a fresh air duct and an exhaust air duct;

[0008] The fresh air temperature and humidity control unit includes a fresh air temperature and humidity control channel, and a fresh air temperature-controlled condenser, a fresh air temperature-controlled evaporator, an isenthalpic humidifier, and an isothermal humidifier arranged sequentially within the fresh air temperature and humidity control channel. One end of the fresh air temperature and humidity control channel is connected to the fresh air supply fan via a fresh air duct, and the other end is connected to the windward side of the main evaporator via a fresh air pipe. The fresh air temperature-controlled condenser forms a condensing parallel structure with the main condenser via refrigerant piping; the fresh air temperature-controlled evaporator forms an evaporating parallel structure with the main evaporator via refrigerant piping.

[0009] The exhaust unit includes an exhaust duct and an exhaust fan installed in the exhaust duct; one end of the exhaust duct is connected to the external exhaust vent of the cold storage through an exhaust path, and the other end is connected to the internal exhaust vent of the cold storage through an exhaust pipe.

[0010] Furthermore, the fresh air heat exchange unit includes a first air-to-air heat exchanger and a second air-to-air heat exchanger connected in sequence. The first air-to-air heat exchanger and the second air-to-air heat exchanger are plate air-to-air heat exchangers, tubular air-to-air heat exchangers, or plate-fin air-to-air heat exchangers.

[0011] Furthermore, the refrigeration unit also includes a first solenoid valve, a second solenoid valve, a third solenoid valve, and a fourth solenoid valve; wherein, the first solenoid valve is disposed between the compressor and the main condenser, and is used to control the refrigerant flow rate entering the main condenser; the second solenoid valve is disposed between the compressor and the fresh air temperature-regulating condenser, and is used to control the refrigerant flow rate entering the fresh air temperature-regulating condenser; the third solenoid valve is disposed between the main condenser and the main evaporator, and is used to control the refrigerant flow rate entering the main evaporator; and the fourth solenoid valve is disposed between the main condenser and the fresh air temperature-regulating evaporator, and is used to control the refrigerant flow rate entering the fresh air temperature-regulating evaporator.

[0012] Furthermore, a liquid receiver is installed between the main condenser, the main evaporator, and the fresh air temperature-regulating evaporator.

[0013] Furthermore, the fresh air temperature and humidity control unit also includes an electric heater located between the fresh air temperature-regulating evaporator and the isenthalpic humidifier.

[0014] Furthermore, the exhaust unit also includes an exhaust filter screen installed in the exhaust duct, which is located between the exhaust fan and the exhaust duct.

[0015] Furthermore, it also includes a fresh air purification unit for housing the fresh air supply fan. The fresh air purification unit includes a fresh air purification channel and a dust removal and filtration component, a sterilization component, and a fresh air supply fan arranged sequentially in the fresh air purification channel. One end of the fresh air purification channel is connected to the outside atmosphere of the cold storage, and the other end of the fresh air purification channel is connected to the fresh air duct.

[0016] Furthermore, the sterilization component is one or more combinations of an ultraviolet sterilizer, a high-voltage electrostatic sterilizer, an ozone sterilizer, a plasma sterilizer, and a wind-activated self-starting photohydrogen ion sterilizer.

[0017] Furthermore, the dust removal and filtration component is one or more combinations of a pre-filter, a medium-efficiency filter, a high-efficiency filter, an ultra-high-efficiency filter, an electrostatic filter, an activated carbon filter, and a photocatalytic filter.

[0018] Furthermore, it also includes a data acquisition unit, which includes a three-in-one sensor for collecting carbon dioxide concentration, temperature and humidity in the cold storage, a temperature sensor for collecting the temperature of the fresh air entering the fresh air temperature and humidity control unit, and a humidity sensor for collecting the humidity of the fresh air after it has been processed by the fresh air temperature control condenser and the fresh air temperature control evaporator.

[0019] Furthermore, it also includes an exhaust module, which includes an exhaust duct and an exhaust filter screen disposed within the exhaust duct, and the exhaust fan is disposed within the exhaust duct and located at the rear end of the exhaust filter screen.

[0020] Compared with the prior art, the present invention has the following beneficial technical effects:

[0021] 1) By installing a fresh air temperature and humidity control unit outside the cold storage, and sequentially installing a fresh air temperature-regulating condenser in parallel with the main condenser of the refrigeration system and a fresh air temperature-regulating evaporator in parallel with the main evaporator within this module, the temperature of the fresh air can be more precisely controlled, and the energy consumption of the ventilation system can be further reduced by utilizing the heat or cold energy of the refrigeration system. After installing the fresh air temperature-regulating condenser and the fresh air temperature-regulating evaporator, isenthalpic and isothermal humidifiers can be installed to further precisely control the humidity of the fresh air. This ensures that the humidity requirements of the cold storage are met without burdening the refrigeration unit, and reduces the impact on temperature while regulating humidity. This avoids a series of problems caused by excessive temperature and humidity fluctuations during ventilation in the cold storage.

[0022] 2) By setting up a fresh air heat exchange unit outside the cold storage to exchange the fresh air and exhaust air, the cold or hot air of the exhaust air is used to pre-cool or preheat the fresh air, thereby reducing the temperature fluctuation of the fresh air in the cold storage, reducing the energy consumption of the ventilation and control system and improving the energy efficiency of the ventilation and control system.

[0023] 3) The dust removal and sterilization components of the fresh air purification unit can effectively filter dust and floating objects in the fresh air, and effectively disinfect bacteria and viruses in the air, which helps to improve the air quality of the cold storage and extend the shelf life of the stored items in the cold storage.

[0024] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the system structure of one embodiment of the present invention;

[0026] Figure 2 for Figure 1 A detailed structural diagram. Detailed Implementation

[0027] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings of the embodiments thereof.

[0028] To address the problems of existing refrigeration systems that directly exhaust air from cold storage and introduce fresh air from outside, resulting in large fluctuations in temperature and humidity, leading to unsuitable temperatures and humidity, increased energy consumption, and a high risk of compressor malfunction, this invention proposes a fresh air exchange device suitable for cold storage. This device includes a refrigeration unit, and sequentially arranged outside the cold storage unit are a fresh air purification unit, a fresh air heat exchange unit, a fresh air temperature and humidity regulating unit, and an exhaust unit. The fresh air temperature and humidity regulating unit contains, in sequence, a fresh air temperature-regulating condenser connected in parallel with the main condenser of the refrigeration unit, a fresh air temperature-regulating evaporator connected in parallel with the main evaporator of the refrigeration unit, an isenthalpic humidifier, and an isothermal humidifier. This fresh air exchange device effectively solves the problems of large fluctuations in temperature and humidity within cold storage, leading to unsuitable temperatures and humidity, increased energy consumption, and a high risk of compressor malfunction.

[0029] Please see Figure 1 This utility model discloses a fresh air exchange device suitable for cold storage warehouses, comprising a refrigeration unit 10, and a fresh air purification unit 20, a fresh air heat exchange unit 30, a fresh air temperature and humidity control unit 40, and an exhaust unit 50 arranged sequentially outside the cold storage warehouse 1. The fresh air temperature and humidity control unit 40 supplies fresh air into the cold storage warehouse 1 through a fresh air duct 60, and the exhaust unit 50 exhausts the air from the cold storage warehouse 1 through an exhaust duct 70. It also includes a data acquisition unit 80 for collecting data on carbon dioxide concentration, temperature, and humidity within the cold storage warehouse, as well as fresh air temperature and humidity.

[0030] For details, please refer to Figure 2 The refrigeration unit 10 is used to control the temperature and humidity inside the cold storage 1. The refrigeration unit 10 includes a compressor 101, a main condenser 102, a liquid receiver 103, a first electronic expansion valve 104, and a main evaporator 105, which are connected in sequence via refrigerant circulation pipelines. The compressor 101, main condenser 102, and liquid receiver 103 are located outside the cold storage 1, while the main evaporator 105 is located inside the cold storage 1. It is used to exchange heat with the air inside the cold storage 1 and to further regulate the temperature and humidity of the fresh air regulated by the fresh air temperature and humidity control unit 40.

[0031] The compressor 101 is connected to the main condenser 102 via the first solenoid valve 106 and to the fresh air temperature and humidity regulating unit 40 via the second solenoid valve 107. The first solenoid valve 106 is used to control the flow rate of the high-temperature and high-pressure gaseous refrigerant entering the main condenser 102, and the second solenoid valve 107 is used to control the flow rate of the high-temperature and high-pressure gaseous refrigerant entering the fresh air temperature and humidity regulating unit 40.

[0032] The liquid receiver 103 is connected to the first electronic expansion valve 104 via the third solenoid valve 108, and sequentially connected to the fresh air temperature and humidity regulating unit 40 via the fourth solenoid valve 109 and the second electronic expansion valve 110. The third solenoid valve 108 is used to control the flow rate of the medium-temperature high-pressure liquid refrigerant entering the main evaporator 105, and the fourth solenoid valve 109 is used to control the flow rate of the medium-temperature high-pressure liquid refrigerant entering the fresh air temperature and humidity regulating unit 40.

[0033] The fresh air purification unit 20 includes a fresh air purification channel 201, and a dust removal and filtration assembly 202, a sterilization assembly 203, and a fresh air supply fan 204 arranged sequentially within the fresh air purification channel 201. One end of the fresh air purification channel 201 is connected to the outside environment, and the other end is connected to the fresh air heat exchange unit 30. Outside fresh air enters the fresh air purification channel 201 due to the suction of the fresh air supply fan 204, and is sequentially filtered by the dust removal and filtration assembly 202 and sterilized and deodorized by the sterilization assembly 203 before entering the fresh air heat exchange unit 30. The fresh air purification unit 20 purifies the incoming outside fresh air, effectively filtering dust and floating particles, and effectively eliminating bacteria and viruses in the air.

[0034] In specific implementation, the dust removal and filtration component 202 may be selected from pre-filters, medium-efficiency filters, high-efficiency filters, ultra-high-efficiency filters, electrostatic filters, activated carbon filters, photocatalytic filters, or combinations thereof, depending on the application requirements of the cold storage. This application makes no restrictions on this selection. The sterilization component 203 may be selected from ultraviolet sterilizers, high-voltage electrostatic sterilizers, ozone sterilizers, plasma sterilizers, wind-activated photohydrogen ion sterilizers, or combinations thereof, depending on the application requirements of the cold storage. This application makes no restrictions on this selection.

[0035] The fresh air heat exchange unit 30 includes a fresh air heat exchange channel 301 and an air-to-air heat exchanger 302 arranged within the fresh air heat exchange channel 301. The air-to-air heat exchanger 302 includes a fresh air path and an exhaust air path. One end of the fresh air path is connected to the fresh air purification channel 201 to receive fresh air supplied by the fresh air supply fan 204, and the other end of the fresh air path is connected to the fresh air temperature and humidity control unit 40 to supply fresh air that has undergone heat exchange pretreatment to the fresh air temperature and humidity control unit 40. One end of the exhaust air path is connected to the exhaust and ventilation unit 50 to receive air discharged from the cold storage 1 by the exhaust fan, and the other end of the exhaust air path is connected to the outside atmosphere to discharge the heat-exchanged air to the outside. The fresh air entering the fresh air heat exchange unit 30 from the fresh air purification unit 20 and the exhaust air entering the fresh air heat exchange unit 30 from the exhaust air unit 50 undergo air-to-air heat exchange in the air-to-air heat exchanger 302 to preheat or precool the fresh air, bringing the temperature of the fresh air close to that of the exhaust air. The fresh air heat exchange unit 30 recovers the heat or cold energy of the air exhausted from the cold storage and transfers the heat or cold energy to the fresh air, so that the fresh air in the fresh air temperature and humidity control unit 40 only needs to consume less energy to achieve the temperature and humidity requirements of the cold storage.

[0036] In practical implementation, to achieve better recovery of heat or cold energy from the exhaust air within the cold storage, depending on the volume of the cold storage and the effectiveness of the air-to-air heat exchangers, two or more air-to-air heat exchangers 302 can be sequentially arranged within the fresh air heat exchange channel 301. The air-to-air heat exchangers 302 can be plate-type, tubular, or plate-fin-type, or a combination of these types; this application does not impose any limitations. In this embodiment, a first air-to-air heat exchanger 302a and a second air-to-air heat exchanger 302b are sequentially arranged within the fresh air heat exchange channel 301.

[0037] The fresh air temperature and humidity control unit 40 includes a fresh air temperature and humidity control channel 401, and a fresh air temperature-controlled condenser 402, a fresh air temperature-controlled evaporator 403, a heater 404, an isenthalpic humidifier 405, and an isothermal humidifier 406 arranged sequentially within the fresh air temperature and humidity control channel 401. One end of the fresh air temperature and humidity control channel 401 is connected to the fresh air supply fan 204 via a fresh air duct, and the other end is connected to the windward side A of the main evaporator 105 via a fresh air duct 60.

[0038] The fresh air temperature-regulating condenser 402 is connected to the compressor 101 via the second solenoid valve 107, forming a condensing parallel structure with the main condenser 102. This condensing parallel structure can further utilize the heat of a small amount of high-temperature, high-pressure gaseous refrigerant to reduce the energy consumption of the ventilation and temperature regulation system. The fresh air temperature-regulating evaporator 403 is connected to the liquid receiver 103 via the second electronic expansion valve 110 and the fourth solenoid valve 109, forming an evaporating parallel structure with the main evaporator 105. This evaporating parallel structure can also further utilize the cooling capacity of a small amount of medium-temperature liquid refrigerant to reduce the energy consumption of the ventilation and temperature regulation system.

[0039] To ensure the heating effect of the fresh air temperature and humidity regulating unit 40, if the fresh air temperature still cannot meet the requirements of the cold storage after being regulated by the fresh air temperature regulating condenser 402 or the fresh air temperature regulating evaporator 403, the heater 404 can be started to reheat the fresh air.

[0040] The exhaust unit 50 includes an exhaust duct 501, an exhaust filter 502, and an exhaust fan 503 installed within the exhaust duct 501. One end of the exhaust duct 501 is connected to an exhaust path, and the other end is connected to an exhaust inlet B inside the cold storage via an exhaust pipe 70. This exhaust inlet B is located in the lower part of the cold storage space. Air from the cold storage enters the exhaust inlet due to the suction of the exhaust fan 503, passes through the exhaust pipe into the exhaust duct 501, is filtered for air impurities by the exhaust filter 502, and then enters the fresh air heat exchange unit 30 to exchange heat with purified fresh air before being discharged.

[0041] The data acquisition unit 80 includes a temperature, humidity, and carbon dioxide combined sensor 801 installed inside the cold storage 1; a temperature sensor 802 installed at the fresh air inlet inside the fresh air temperature and humidity regulating channel 401; and a humidity sensor 803 installed inside the fresh air temperature and humidity regulating channel 401 between the heater 404 and the isenthalpic humidifier 405. The temperature, humidity, and carbon dioxide combined sensor 801 is used to monitor the carbon dioxide concentration inside the cold storage. temperature and humidity Temperature sensor 802 is used to monitor the temperature of the fresh air entering the fresh air temperature and humidity regulating channel 401 after heat exchange by the fresh air heat exchange unit 30. Humidity sensor 803 is used to monitor the humidity of fresh air after it has been temperature-treated by fresh air temperature-controlled condenser 402 and / or fresh air temperature-controlled evaporator 403 and / or heater 404. When the fresh air, after heat exchange, enters the fresh air temperature and humidity regulating unit 40 from the fresh air heat exchange unit 30, the fresh air temperature regulating condenser 402 or the fresh air temperature regulating evaporator 403 is activated according to the fresh air temperature monitored by the temperature sensor 802 to further regulate the fresh air temperature; then, according to the fresh air humidity monitored by the humidity sensor 803, the isenthalpic humidifier 405 or the isothermal humidifier 406 is activated to increase the fresh air humidity. Among them, the isenthalpic humidifier utilizes the isenthalpic working principle and does not increase the system load.

[0042] In order to ensure and maintain the air pressure in the cold storage at a suitable range, an air pressure balancing valve 90 is also installed inside the cold storage. When the air pressure inside the cold storage is lower than the outside atmospheric pressure by a certain value, the air pressure balancing valve 90 will automatically open to restore the air pressure inside and outside the storage to a balanced state.

[0043] Example

[0044] One embodiment of this utility model is applied to a cold storage facility for the constant temperature and humidity growth and storage of mushrooms. This cold storage facility must be kept stable at 18±1℃, 60±5%RH, and CO2 concentration less than 500PPM for a long period of time.

[0045] The temperature, humidity and carbon dioxide three-in-one sensor 801 in the cold storage monitors the three indicators of temperature, humidity and carbon dioxide concentration in real time. When the CO2 concentration is greater than the control value, the fresh air supply fan 204 and the exhaust fan 503 are turned on at the same time. Fresh air from outside enters the fresh air purification channel 201. After being cleaned and sterilized by the fresh air purification unit 20, it enters the fresh air heat exchange channel 301. In the fresh air heat exchange channel 301, it undergoes two heat exchange pretreatments with the exhaust air from the exhaust channel 501. Through these two heat exchanges, a large amount of heat or cold energy in the exhaust air is recovered. The fresh air heat exchange unit 30 makes the fresh air temperature close to the exhaust air temperature, thereby saving energy. The pretreated fresh air enters the fresh air temperature and humidity regulation channel 401. In the fresh air temperature and humidity regulation channel 401, the temperature and humidity values ​​of the pretreated fresh air are monitored and compared with the temperature and humidity values ​​inside the cold storage to determine whether heating or cooling is needed to control the refrigerant flow into the temperature-regulating evaporator or temperature-regulating condenser, and to determine whether humidification is needed to control the start of the isenthalpic humidifier 405. Finally, the adjusted fresh air is delivered into the cold storage.

[0046] During the entire air exchange process in the cold storage, the exhaust air cooling or heating capacity is recovered in the fresh air heat exchange unit 30; the condensation heat of the main condenser is reused in the fresh air temperature and humidity control unit 40; and isenthalpic humidification is adopted in the fresh air temperature and humidity control unit 40 and the cold storage, without generating any accompanying heat, thus not burdening the system and reducing the impact on temperature while regulating humidity.

[0047] Compared with the prior art, this utility model has the following beneficial technical effects:

[0048] 1) By installing a fresh air temperature and humidity control unit outside the cold storage, and sequentially installing a fresh air temperature-regulating condenser in parallel with the main condenser of the refrigeration system and a fresh air temperature-regulating evaporator in parallel with the main evaporator within this module, the temperature of the fresh air can be more precisely controlled, and the energy consumption of the ventilation system can be further reduced by utilizing the heat or cold energy of the refrigeration system. After installing the fresh air temperature-regulating condenser and the fresh air temperature-regulating evaporator, isenthalpic and isothermal humidifiers can be installed to further precisely control the humidity of the fresh air. This ensures that the humidity requirements of the cold storage are met without burdening the refrigeration unit, and reduces the impact on temperature while regulating humidity. This avoids a series of problems caused by excessive temperature and humidity fluctuations during ventilation in the cold storage.

[0049] 2) By setting up a fresh air heat exchange unit outside the cold storage to exchange the fresh air and exhaust air, the cold or hot air of the exhaust air is used to pre-cool or preheat the fresh air, thereby reducing the temperature fluctuation of the fresh air in the cold storage, reducing the energy consumption of the ventilation and control system and improving the energy efficiency of the ventilation and control system.

[0050] 3) The dust removal and sterilization components of the fresh air purification unit can effectively filter dust and floating objects in the fresh air, and effectively disinfect bacteria and viruses in the air, which helps to improve the air quality of the cold storage and extend the shelf life of the stored items in the cold storage.

[0051] The terminology used in this embodiment of the invention is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of the invention. The singular forms “a,” “the,” and “the” used in the embodiments of the invention and the claims are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that, unless otherwise stated, “a plurality” and “several” refer to two or more; “and / or” refers to and includes any or all possible combinations of one or more associated listed items; “first,” “second,” “third,” etc., are used only to distinguish and not to describe a particular order or sequence, nor should they be construed as indicating or implying relative importance. When the above description relates to drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. In the description of this invention, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0052] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model, and this utility model also intends to include these modifications and variations.

Claims

1. A fresh air ventilation device for a cold storage room, characterized in that, include: The refrigeration unit includes a compressor, a main condenser, and a main evaporator connected in sequence via refrigerant circulation piping. The fresh air heat exchange unit includes a gas-to-gas heat exchanger; wherein the gas-to-gas heat exchanger includes a fresh air duct and an exhaust air duct; The fresh air temperature and humidity control unit includes a fresh air temperature and humidity control channel, and a fresh air temperature-controlled condenser, a fresh air temperature-controlled evaporator, an isenthalpic humidifier, and an isothermal humidifier arranged sequentially within the fresh air temperature and humidity control channel. One end of the fresh air temperature and humidity control channel is connected to the fresh air supply fan via a fresh air duct, and the other end is connected to the windward side of the main evaporator via a fresh air pipe. The fresh air temperature-controlled condenser forms a condensing parallel structure with the main condenser via refrigerant piping; the fresh air temperature-controlled evaporator forms an evaporating parallel structure with the main evaporator via refrigerant piping. The exhaust unit includes an exhaust duct and an exhaust fan installed in the exhaust duct; one end of the exhaust duct is connected to the external exhaust vent of the cold storage through an exhaust path, and the other end is connected to the internal exhaust vent of the cold storage through an exhaust pipe.

2. The fresh air ventilation device for a cold storage room according to claim 1, wherein The fresh air heat exchange unit includes a first air-to-air heat exchanger and a second air-to-air heat exchanger connected in sequence. The first air-to-air heat exchanger and the second air-to-air heat exchanger are plate air-to-air heat exchangers, tubular air-to-air heat exchangers, or plate-fin air-to-air heat exchangers.

3. The fresh air exchange device for cold storage according to claim 1, characterized in that, The refrigeration unit further includes a first solenoid valve, a second solenoid valve, a third solenoid valve, and a fourth solenoid valve; wherein, the first solenoid valve is disposed between the compressor and the main condenser, and is used to control the refrigerant flow rate entering the main condenser; the second solenoid valve is disposed between the compressor and the fresh air temperature-regulating condenser, and is used to control the refrigerant flow rate entering the fresh air temperature-regulating condenser; the third solenoid valve is disposed between the main condenser and the main evaporator, and is used to control the refrigerant flow rate entering the main evaporator; and the fourth solenoid valve is disposed between the main condenser and the fresh air temperature-regulating evaporator, and is used to control the refrigerant flow rate entering the fresh air temperature-regulating evaporator.

4. The fresh air ventilation device for a cold storage room according to claim 3, wherein A liquid receiver is also installed between the main condenser, the main evaporator, and the fresh air temperature-regulating evaporator.

5. The fresh air ventilation device for a cold storage according to claim 1, wherein The fresh air temperature and humidity control unit also includes an electric heater located between the fresh air temperature-regulating evaporator and the isenthalpic humidifier.

6. The fresh air ventilation device for a cold storage room according to claim 1, wherein The exhaust unit also includes an exhaust filter screen installed in the exhaust duct, which is located between the exhaust fan and the exhaust duct.

7. The fresh air exchange device for cold storage according to any one of claims 1 to 6, characterized in that, It also includes a fresh air purification unit for housing the fresh air supply fan. The fresh air purification unit includes a fresh air purification channel and a dust removal and filtration component, a sterilization component, and a fresh air supply fan arranged sequentially in the fresh air purification channel. One end of the fresh air purification channel is connected to the outside atmosphere of the cold storage, and the other end of the fresh air purification channel is connected to the fresh air duct.

8. The fresh air ventilation device for a cold storage room according to claim 7, wherein The sterilization component is one or more combinations of ultraviolet sterilizer, high-voltage electrostatic sterilizer, ozone sterilizer, plasma sterilizer, and wind-activated photohydrogen ion sterilizer.

9. The fresh air ventilation device for a cold storage room according to claim 7, wherein The dust removal and filtration component is one or more of the following: pre-filter, medium-efficiency filter, high-efficiency filter, ultra-high-efficiency filter, electrostatic filter, activated carbon filter, and photocatalytic filter.

10. The fresh air ventilation device for a cold storage room according to claim 1, wherein It also includes a data acquisition unit, which includes a three-in-one sensor for collecting carbon dioxide concentration, temperature and humidity in the cold storage, a temperature sensor for collecting the temperature of the fresh air entering the fresh air temperature and humidity control unit, and a humidity sensor for collecting the humidity of the fresh air after it has been processed by the fresh air temperature control condenser and the fresh air temperature control evaporator.

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