Dehumidification system

Abstract

The utility model discloses a dehumidification system, and relates to the technical field of air treatment systems. The air conditioner specifically comprises an evaporator, and air flow in an air duct is condensed and cooled through evaporation of refrigerants in the evaporator so as to reduce the humidity of the air flow; the first condenser is connected to the evaporator through an expansion valve and used for conveying the liquid and / or gaseous refrigerant into the evaporator, and the first condenser is arranged in the air duct and used for heating the cooled airflow; the second condenser is connected to the first condenser and used for conveying the liquid and / or gaseous refrigerant to the first condenser, and the second condenser is arranged outside the air duct; the compressor is connected to the evaporator and used for compressing the gaseous and / or liquid refrigerants in the evaporator to form liquid refrigerants and conveying the liquid refrigerants to the second condenser; and the positive pressure fan is used for driving airflow to sequentially pass through the evaporator and the first condenser. The utility model aims to reduce the energy consumption of a dehumidification system while keeping the humidity control of a lithium battery production environment.

Description

Technical Field

[0001] This utility model relates to the field of air handling system technology, and in particular to a dehumidification system. Background Technology

[0002] The positive and negative electrode materials and electrolyte of lithium batteries are highly hygroscopic. During battery production, if the humidity in the workshop is too high, moisture will seep into the battery, leading to material performance degradation. Moisture penetration not only affects battery capacity, cycle life, and charge / discharge efficiency, but can also cause serious quality problems such as internal corrosion, leakage, and bulging, ultimately potentially rendering the battery unusable. This is especially true for high-performance battery packs, where consistency between different battery cells is crucial to overall battery performance. Improper humidity control can severely impact consistency between battery packs, even causing a decline in overall battery pack performance.

[0003] Therefore, the production environment for lithium batteries requires strict humidity control to ensure the stability of battery materials and the quality of battery products. In the upstream processes (such as the assembly and packaging of individual battery cells), the requirements for temperature and humidity are particularly stringent. According to industry standards, the ambient temperature for upstream processes must be between 22-28℃, and the relative humidity must be controlled below 45%. To meet these requirements, rotary dehumidifiers are commonly used in battery production workshops to regulate humidity.

[0004] Rotary dehumidifiers are a common type of industrial dehumidification device. Their working principle relies on a dehumidifying rotor that absorbs moisture from the air using a moisture-absorbing material, releasing the absorbed moisture through a regeneration process. Rotary dehumidifiers offer good dehumidification efficiency; however, because the dehumidifying rotor lowers the air temperature when processing humid air, an additional cooling device is needed on the processing side to maintain a suitable temperature, increasing cold source consumption. Furthermore, the rotor requires an additional heating device to reheat during regeneration to remove the absorbed moisture, resulting in high energy consumption during the regeneration process.

[0005] Therefore, how to reduce the energy consumption of the dehumidification system while maintaining humidity control in the lithium battery production environment has become a pressing technical challenge in the lithium battery production process. Utility Model Content

[0006] The main purpose of this invention is to provide a dehumidification system that aims to reduce the energy consumption of the dehumidification system while maintaining humidity control in the lithium battery production environment.

[0007] To achieve the above objectives, this utility model proposes a dehumidification system, comprising:

[0008] An evaporator, located inside an air duct, cools the airflow by condensing the refrigerant inside the evaporator, thereby reducing the humidity of the airflow.

[0009] The first condenser is connected to the evaporator via an expansion valve and is used to deliver liquid and / or gaseous refrigerant into the evaporator. The first condenser is located in the air duct and is used to heat the cooled airflow.

[0010] A second condenser is connected to the first condenser and is used to deliver liquid and / or gaseous refrigerant to the first condenser. The second condenser is located outside the air duct.

[0011] A compressor, connected to the evaporator, is used to compress gaseous and / or liquid refrigerant within the evaporator to form liquid refrigerant, and to deliver the liquid refrigerant to the second condenser; and

[0012] A positive pressure fan is installed inside the air duct to drive airflow through the evaporator and the first condenser in sequence.

[0013] This dehumidification system achieves effective coordination between airflow and refrigerant through its structure. The coordinated operation of the evaporator, condenser, and compressor ensures effective dehumidification. Precise temperature and humidity control within the system ensures stable operation under various environmental conditions. The dual-condenser design effectively improves condensation efficiency and reduces system energy consumption. The positive pressure fan configuration guarantees positive pressure operation within the system, avoiding sealing problems caused by negative pressure, thereby improving dehumidification performance and enhancing system reliability.

[0014] In one embodiment of this application, a surface cooler for cooling the airflow is provided on the side of the evaporator away from the first condenser.

[0015] By installing a surface cooler on the side of the evaporator away from the first condenser, the temperature of the airflow passing through the evaporator can be effectively reduced, allowing for more efficient humidity control as the airflow enters the evaporator. The surface cooler's design works synergistically with the evaporator to optimize heat exchange efficiency during dehumidification, enhancing the overall performance of the system.

[0016] In one embodiment of this application, a first filter for removing airborne particulate matter is provided on the side of the surface cooler away from the evaporator.

[0017] By installing a first filter on the side of the surface cooler furthest from the evaporator, particulate matter in the air can be effectively removed, ensuring airflow cleanliness and preventing particulate matter from accumulating on critical components such as the surface cooler and evaporator, thus avoiding reduced heat exchange efficiency and system malfunctions. The design of the first filter not only enhances the system's dehumidification effect but also improves its long-term stability and reliability, reducing maintenance costs.

[0018] In one embodiment of this application, a heater for heating the airflow is provided on the side of the first condenser away from the evaporator.

[0019] By installing a heater on the side of the first condenser furthest from the evaporator, the airflow passing through the first condenser can be effectively heated, preventing the airflow temperature from being too low and affecting subsequent processes. Simultaneously, the heater can automatically adjust according to the actual needs of the airflow, ensuring precise energy efficiency and temperature and humidity control of the system.

[0020] In one embodiment of this application, a second filter for filtering airflow is provided on the side of the heater away from the first condenser.

[0021] By installing a second filter on the side of the heater away from the first condenser, fine particulate matter in the airflow can be effectively removed, ensuring that the heated airflow is clean, avoiding the impact of particulate matter on subsequent equipment, and extending the service life of the system.

[0022] In one embodiment of this application, a fresh air valve is provided at the air inlet of the air duct.

[0023] By installing a fresh air valve at the air inlet of the air duct, the amount of fresh air entering can be flexibly adjusted, ensuring that the system can effectively control the airflow under different working conditions.

[0024] In one embodiment of this application, a first fireproof valve is provided at the air outlet of the air duct.

[0025] By installing a primary fire damper at the air outlet of the duct, the spread of fire within the duct can be effectively prevented, ensuring rapid isolation of the fire source in the event of a fire and protecting the safety of the building and its occupants. The automatic closing function of the primary fire damper enables a rapid response to a fire and prevents its spread.

[0026] In one embodiment of this application, a return air duct is further included, wherein the air outlet of the duct is connected to the target space, the air inlet of the return air duct is connected to the target space, the air outlet of the return air duct is connected to the duct, and is located between the evaporator and the surface cooler.

[0027] By connecting the air outlet of the air duct to the target space and simultaneously designing a return air duct to draw air from the target space back into the system and process it through the evaporator, airflow circulation and humidity control can be effectively achieved. The configuration of the return air duct improves the system's airflow efficiency, reduces the need for fresh air introduction, and optimizes dehumidification and cooling effects.

[0028] In one embodiment of this application, a return air valve is provided on the return air duct.

[0029] By installing return air valves on the return air ducts, the return air volume can be flexibly adjusted. The adjustment function of the return air valves can improve the accuracy of temperature and humidity control in the system, ensure reasonable airflow distribution, and thus improve the dehumidification efficiency and energy efficiency of the entire system.

[0030] In one embodiment of this application, the return air duct is further provided with a second fireproof valve.

[0031] By installing a second fire damper in the return air duct, the spread of fire through the duct can be effectively prevented, enhancing the system's safety in case of fire. In the event of a fire, the return air path can be cut off promptly, preventing the spread of flames and heat and protecting equipment and personnel.

[0032] By employing the above technical solution, this dehumidification system achieves effective cooperation between airflow and refrigerant in its structure. Through the coordinated operation of the evaporator, condenser, and compressor, effective dehumidification of the airflow is ensured. The airflow within the system can be precisely controlled for temperature and humidity, ensuring stable operation under various environmental conditions. The dual-condenser design effectively improves condensation efficiency and reduces system energy consumption. The positive pressure fan configuration ensures positive pressure operation of the airflow within the system, avoiding sealing problems caused by negative pressure, thereby improving dehumidification effect and enhancing system reliability. Attached Figure Description

[0033] The present invention will now be described in detail with reference to specific embodiments and accompanying drawings, wherein:

[0034] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present utility model;

[0035] 10. Evaporator; 11. First condenser; 12. Second condenser; 13. Compressor; 20. Positive pressure fan; 30. Surface cooler; 40. First filter; 50. Heater; 60. Second filter; 70. Fresh air valve; 80. First fire damper; 90. Target space; 100. Return air duct; 101. Return air valve; 102. Second fire damper. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the following specific embodiments are only used to explain this utility model and do not constitute a limitation on this utility model.

[0037] like Figure 1 As shown, in order to achieve the above objectives, this utility model proposes a dehumidification system, comprising:

[0038] Evaporator 10 is located inside the air duct. The refrigerant inside the evaporator 10 evaporates and condenses the airflow in the air duct to cool it down, thereby reducing the humidity of the airflow.

[0039] The first condenser 11 is connected to the evaporator 10 via an expansion valve and is used to deliver liquid and / or gaseous refrigerant into the evaporator 10. The first condenser 11 is located in the air duct and is used to heat the cooled airflow.

[0040] The second condenser 12 is connected to the first condenser 11 and is used to deliver liquid and / or gaseous refrigerant to the first condenser 11. The second condenser 12 is located outside the air duct.

[0041] Compressor 13, connected to the evaporator 10, is used to compress the gaseous and / or liquid refrigerant within the evaporator 10 to form liquid refrigerant, and to deliver the liquid refrigerant to the second condenser 12; and

[0042] A positive pressure fan 20 is installed in the air duct and is used to drive the airflow through the evaporator 10 and the first condenser 11 in sequence.

[0043] Specifically, the evaporator 10 is located within the air duct and adopts a plate structure with refrigerant channels inside. The refrigerant flows through these channels. When airflow passes through the evaporator 10, the refrigerant evaporates, carrying away heat from the air, lowering the airflow temperature, and causing moisture in the airflow to condense, thus achieving a dehumidification effect. The outer shell material of the evaporator 10 can be aluminum alloy, copper, or other corrosion-resistant materials to enhance its durability and thermal conductivity.

[0044] The first condenser 11 is located within the air duct and connected to the evaporator 10 via an expansion valve. Because the refrigerant in the first condenser 11 is in a high-pressure liquid and / or gaseous state with a high temperature, it can exchange heat with the air, thereby heating the airflow within the air duct. The first condenser 11 can be a coil type, finned type, or shell-and-tube type, with its external cooling fins carrying away the heat generated by the condenser through airflow. The first condenser 11 and the evaporator 10 are connected via a refrigerant pipe and an expansion valve, through which the refrigerant flows from the first condenser 11 to the evaporator 10.

[0045] The second condenser 12 is connected to the first condenser 11 and located outside the air duct. It is used to deliver liquid and / or gaseous refrigerant to the first condenser 11. The second condenser 12 is designed to be externally air-cooled, cooling the liquid refrigerant through a fan or natural ventilation and delivering it to the first condenser 11 through pipes. The second condenser 12 may employ a finned tube structure to improve heat exchange efficiency and ensure that the refrigerant can be effectively cooled at this location.

[0046] The compressor 13 is connected to the evaporator 10 via a pipe and is responsible for compressing the gaseous and / or liquid refrigerant within the evaporator 10, converting it into high-temperature, high-pressure liquid refrigerant. The compressor 13 works by drawing in the gaseous refrigerant evaporated in the evaporator 10, increasing the temperature and pressure of the refrigerant through compression, and then sending the liquid refrigerant into the second condenser 12. The compressor 13 can be a piston, screw, or rotary type, selected according to system requirements.

[0047] The positive pressure fan 20 is installed inside the duct, located at the air inlet. Its main function is to drive airflow sequentially through the evaporator 10 and the first condenser 11. The positive pressure fan 20 ensures that air can smoothly pass through the evaporator 10, the first condenser 11, and other system components by providing sufficient airflow pressure. The fan can be an axial flow fan or a centrifugal fan; the appropriate fan model should be selected according to the requirements of the duct, which will not be elaborated further here.

[0048] By adopting the above technical solution, the dehumidification system achieves effective cooperation between airflow and refrigerant in its structure. Through the coordinated operation of the evaporator 10, condenser, and compressor 13, effective dehumidification of the airflow is ensured. The airflow within the system can be precisely controlled for temperature and humidity, ensuring stable operation under various environmental conditions. The dual-condenser design effectively improves condensation efficiency and reduces system energy consumption. The positive pressure fan 20 ensures positive pressure operation of the airflow within the system, avoiding sealing problems caused by negative pressure, thereby improving dehumidification effect and enhancing system reliability.

[0049] In one embodiment of this application, a surface cooler 30 for cooling the airflow is provided on the side of the evaporator 10 away from the first condenser 11.

[0050] Specifically, the surface cooler 30 is located on the side of the evaporator 10 away from the first condenser 11, and is used to pre-cool the airflow that has not yet passed through the evaporator 10. The surface cooler 30 can be a finned tube type, including several pipes that flow with the refrigerant and fins attached to the outside of the pipes. The function of the fins is to increase the heat exchange area and improve the airflow cooling efficiency. The surface cooler 30 can be made of aluminum alloy or copper to ensure its good thermal conductivity. Its installation position is in the air duct to cool the airflow.

[0051] The airflow first passes through the surface cooler for pre-cooling. After the temperature drops, the airflow passes through the evaporator 10 again, where the refrigerant absorbs heat, further reducing the airflow temperature. The surface cooler 30 serves as a further cooling unit for the airflow, helping to improve the dehumidification efficiency of the entire system.

[0052] By adopting the above technical solution, and by setting a surface cooler 30 on the side of the evaporator 10 away from the first condenser 11, the temperature of the airflow passing through the evaporator 10 can be effectively reduced, enabling more efficient humidity control when the airflow enters the evaporator 10. The design of the surface cooler 30 works synergistically with the evaporator 10 to optimize the heat exchange efficiency during the dehumidification process and enhance the overall performance of the system.

[0053] In one embodiment of this application, a first filter 40 for removing airborne particulate matter is provided on the side of the surface cooler 30 away from the evaporator 10.

[0054] Specifically, the first filter 40 is located on the side of the surface cooler 30 furthest from the evaporator 10, before the airflow passes through the surface cooler 30. Its main function is to remove suspended particulate matter from the air, such as dust, fibers, and pollen, to ensure air quality within the system and prevent particulate matter from accumulating on the surface cooler 30 and other components, thereby improving system efficiency and extending equipment lifespan. The first filter 40 can have a multi-layer structure, and common filter materials include fiber filters, activated carbon filters, or HEPA filters.

[0055] The first filter 40 is installed at the air inlet of the surface cooler 30, forming the first barrier to airflow. Air passes through the first filter 40 before entering the surface cooler 30. The first filter 40 is connected to the surface cooler 30 by a fixed bracket or connecting frame to ensure that the filter can be stably mounted on the surface cooler 30 without affecting the smooth flow of air.

[0056] To maintain filtration effectiveness, the first filter 40 can be designed as a removable and replaceable structure, or maintained through regular cleaning. The filter is equipped with indicators or cleaning reminder mechanisms to facilitate timely replacement or cleaning by operators, ensuring the system always operates at its optimal condition.

[0057] By employing the above technical solution, and by installing a first filter 40 on the side of the surface cooler 30 furthest from the evaporator 10, particulate matter in the air can be effectively removed, ensuring airflow cleanliness and preventing particulate matter from accumulating on key components such as the surface cooler 30 and the evaporator 10, thus avoiding reduced heat exchange efficiency and system malfunctions. The design of the first filter 40 not only enhances the system's dehumidification effect but also improves the system's long-term stability and reliability, reducing maintenance costs.

[0058] In one embodiment of this application, a heater 50 for heating the airflow is provided on the side of the first condenser 11 away from the evaporator 10.

[0059] Specifically, the heater 50 is located on the side of the first condenser 11 away from the evaporator 10, after the airflow passes through the first condenser 11, and is mainly used to heat the airflow. The heater 50 can be of different types, such as electric heating, steam heating, or water heating, and the appropriate heating method can be selected according to the system requirements. The heater 50 internally transfers heat to the airflow through heating elements (such as electric heating wires, steam pipes, or hot water pipes) to increase the airflow temperature. The outer shell of the heater 50 is made of high-temperature resistant and corrosion-resistant materials, such as aluminum alloy or stainless steel.

[0060] After passing through the first condenser 11, the airflow enters the heater 50 for heating. The heater 50 is installed in the air duct by a fixed bracket or a special frame to ensure that the heater 50 can be stably installed and effectively heat the airflow. Between the inlet and outlet of the heater 50, an appropriate airflow channel ensures that the airflow can fully absorb heat as it passes through the heater 50.

[0061] The heater 50 heats the airflow passing through the first condenser 11 using methods such as electric heating, steam heating, or hot water heating. As the airflow passes through the heater 50, its temperature increases. The heater 50 effectively regulates the airflow temperature to ensure that the airflow remains within a suitable temperature and humidity range throughout the system.

[0062] To ensure that heater 50 can automatically adjust its temperature according to the airflow demand, heater 50 is equipped with a temperature control device. The temperature control device can automatically start and stop heater 50 according to changes in airflow temperature, or adjust the heating power according to a set temperature range to ensure that the airflow temperature is always at the required level.

[0063] By adopting the above technical solution, a heater 50 is installed on the side of the first condenser 11 away from the evaporator 10, which can effectively heat the airflow passing through the first condenser 11 and prevent the airflow temperature from being too low and affecting subsequent processes. At the same time, the heater 50 can be automatically adjusted according to the actual needs of the airflow to ensure the system's energy efficiency and precise temperature and humidity control.

[0064] In one embodiment of this application, a second filter 60 for filtering airflow is provided on the side of the heater 50 away from the first condenser 11.

[0065] Specifically, the second filter 60 is located on the side of the heater 50 furthest from the first condenser 11, after the airflow has passed through the heater 50. Its main function is to remove fine particulate matter, such as dust, fumes, and microorganisms, from the airflow, ensuring the cleanliness of the heated airflow and preventing particulate matter from depositing in the heater 50 or other downstream system components, thus affecting equipment performance. The second filter 60 can have a multi-layer structure, and common filter materials include high-efficiency particulate filters, activated carbon filters, or HEPA filters. The appropriate filter material and filtration precision are selected according to system requirements.

[0066] By adopting the above technical solution, by setting a second filter 60 on the side of the heater 50 away from the first condenser 11, fine particulate matter in the airflow can be effectively removed, ensuring that the heated airflow is clean, avoiding the impact of particulate matter on subsequent equipment, and extending the service life of the system.

[0067] In one embodiment of this application, a fresh air valve 70 is provided at the air inlet of the air duct.

[0068] Specifically, the fresh air valve 70 is installed at the air inlet of the duct, and its main function is to control the amount of fresh air introduced from outside. The fresh air valve 70 can be adjusted electrically or manually to regulate the airflow according to the system's needs. The structure of the fresh air valve 70 can be sliding, rotary, or pneumatic. The fresh air valve 70 consists of a valve body, valve blades, and a drive mechanism. The valve body is made of corrosion-resistant metal materials such as stainless steel or aluminum alloy, and the valve blade design ensures a complete seal when opening or closing, preventing air leakage.

[0069] The fresh air valve 70 is connected to the air inlet of the duct via a flange or sealing joint, ensuring a secure installation and allowing for adjustment of the fresh air volume as airflow passes through. The inlet of the fresh air valve 70 connects to the external environment, while the outlet connects to the duct system. By adjusting the opening degree of the fresh air valve 70, the amount of fresh air entering can be controlled, thereby affecting the overall airflow of the system.

[0070] By adopting the above technical solution, by installing a fresh air valve 70 at the air inlet of the air duct, the amount of fresh air entering can be flexibly adjusted to ensure that the system can effectively control the airflow under different working conditions.

[0071] In one embodiment of this application, a first fireproof valve 80 is provided at the air outlet of the air duct.

[0072] Specifically, the first fire damper 80 is installed at the air outlet of the duct. Its main function is to automatically cut off or isolate the fire source in the event of a fire, preventing flames and heat from spreading along the duct. The first fire damper 80 is made of fire-resistant material, maintaining structural stability in high-temperature environments and effectively preventing the spread of fire. This fire damper features an automatic closing design; a heat sensor is installed inside the valve, which detects a certain temperature rise and automatically triggers the valve to close. The valve body is made of high-temperature resistant materials such as stainless steel or aluminum alloy, ensuring reliability in fire situations.

[0073] The first fire damper 80 is connected to the air outlet of the duct via a flange or sealing joint, ensuring that the valve can be securely installed and effectively prevent the spread of fire. When abnormally high temperatures occur in the duct, the heat sensor of the first fire damper 80 will detect the temperature change and drive the valve blades to close, isolating the ignition source. The closure of the fire damper can completely block the airflow, preventing the fire from spreading to other areas in the duct system.

[0074] By adopting the above technical solution, and installing a first fire damper 80 at the air outlet of the duct, the spread of fire within the duct can be effectively prevented, ensuring rapid isolation of the fire source in the event of a fire and protecting the safety of the building and personnel. The automatic closing function of the first fire damper 80 enables a rapid response to a fire and prevents the fire from spreading.

[0075] In one embodiment of this application, a return air duct 100 is further included. The air outlet of the duct is connected to the target space 90, the air inlet of the return air duct 100 is connected to the target space 90, and the air outlet of the return air duct 100 is connected to the duct and located between the evaporator 10 and the surface cooler 30.

[0076] Specifically, the return air duct 100 is used to guide air from the target space 90 to the air duct system. The return air duct 100 is made of a corrosion-resistant and easy-to-clean material (such as galvanized steel sheet or PVC pipe).

[0077] The inlet of the return air duct 100 is connected to the target space 90 via an air outlet, grille, or return air valve. The outlet of the return air duct 100 is connected to the ductwork and located between the evaporator 10 and the surface cooler 30. This location ensures effective cooling and dehumidification of the airflow as it passes through the evaporator 10. The connection between the return air duct 100 and the ductwork can be achieved using flanges, joints, or sealing devices, ensuring that the connection is leak-proof and can withstand the pressure of the airflow.

[0078] By adopting the above technical solution, connecting the air outlet of the air duct to the target space 90, and simultaneously designing a return air duct 100 to draw the air from the target space 90 back into the system and process it through the evaporator 10, airflow circulation and humidity control can be effectively achieved. The configuration of the return air duct 100 improves the airflow efficiency of the system, reduces the need for fresh air introduction, and optimizes dehumidification and cooling effects.

[0079] In one embodiment of this application, a return air valve 101 is provided on the return air duct 100.

[0080] Specifically, the return air valve 101 is installed on the return air duct 100, and its main function is to regulate the airflow in the return air duct 100. The return air valve 101 can be adjusted electrically, pneumatically, or manually to regulate the return air volume and control the airflow in the return air duct 100 according to system requirements. The structure of the return air valve 101 includes a valve body, valve blades, and a drive device. The valve body is made of corrosion-resistant metal materials such as stainless steel or aluminum alloy to ensure its stability during long-term use. The return air valve 101 is connected to the return air duct 100 via flanges, bolts, or sealing joints, ensuring that the valve is securely installed on the return air duct 100 and can be adjusted as needed for airflow.

[0081] By adopting the above technical solution, the return air volume can be flexibly adjusted by installing a return air valve 101 on the return air duct 100. The adjustment function of the return air valve 101 can improve the temperature and humidity control accuracy of the system, ensure reasonable airflow distribution, and thus improve the dehumidification efficiency and energy efficiency of the entire system.

[0082] In one embodiment of this application, the return air duct 100 is further provided with a second fireproof valve 102.

[0083] Specifically, the second fire damper 102 is installed in the return air duct 100. Its main function is to automatically cut off or isolate the fire source in the event of a fire, preventing the spread of flames and heat through the return air duct 100. The second fire damper 102 is made of fire-resistant material, enabling it to maintain structural stability under high-temperature conditions and effectively prevent the spread of fire. This fire damper is equipped with an automatic closing mechanism triggered by a temperature sensing element. When the temperature inside the return air duct 100 exceeds a certain threshold, the valve automatically closes, preventing the spread of fire through the return air duct 100. The valve body is made of high-temperature resistant materials such as stainless steel and aluminum alloy to ensure the durability and reliability of the fire damper.

[0084] By adopting the above technical solution and installing a second fire damper 102 in the return air duct 100, the spread of fire through the return air duct 100 can be effectively prevented, enhancing the system's safety in case of fire. In the event of a fire, the return air path can be cut off promptly to prevent the spread of flames and heat, protecting equipment and personnel safety.

[0085] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A dehumidification system, characterized by, The application relates to an air conditioning system, comprising: an evaporator arranged in an air duct, which is used to condense and cool the air flow in the air duct by the evaporation of refrigerant in the evaporator, so as to reduce the humidity of the air flow; a first condenser connected to the evaporator through an expansion valve, which is used to deliver liquid and / or gaseous refrigerant to the evaporator, and the first condenser is arranged in the air duct, which is used to heat the cooled air flow; a second condenser connected to the first condenser, which is used to deliver liquid and / or gaseous refrigerant to the first condenser, and the second condenser is arranged outside the air duct; a compressor connected to the evaporator, which is used to compress the gaseous and / or liquid refrigerant in the evaporator to form liquid refrigerant, and deliver the liquid refrigerant to the second condenser; and a positive pressure fan arranged in the air duct, which is used to drive the air flow to pass through the evaporator and the first condenser in sequence.

2. The dehumidification system of claim 1, wherein, The evaporator is provided with a surface cooler on the side far away from the first condenser, which is used to cool the air flow.

3. The dehumidification system of claim 2, wherein, The surface cooler is provided with a first filter on the side far away from the evaporator, which is used to remove particulate matters in the air.

4. The dehumidification system of any one of claims 1 to 3, wherein, The first condenser is provided with a heater on the side far away from the evaporator, which is used to heat the air flow.

5. The dehumidification system of claim 4, wherein, The heater is provided with a second filter on the side far away from the first condenser, which is used to filter the air flow.

6. The dehumidification system of claim 1, wherein, The air duct is provided with a fresh air valve at the air inlet.

7. The dehumidification system of claim 1, wherein, The air duct is provided with a first fireproof valve at the air outlet.

8. The dehumidification system of claim 2, wherein, The air duct is further provided with a return air duct, the air outlet of the air duct is connected to a target space, the air inlet of the return air duct is connected to the target space, and the air outlet of the return air duct is connected to the air duct and located between the evaporator and the surface cooler.

9. The dehumidification system of claim 8, wherein, The return air duct is provided with a return air valve.

10. The dehumidification system of claim 9, wherein, The return air duct is further provided with a second fireproof valve.

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