Refrigerator cabinet compressor bin anti-rust paint air draft system and control method

Abstract

The invention provides an anti-rust paint air draft system for a compressor bin of a refrigerator cabinet and a control method, the system comprises a plurality of smell detection modules, the smell detection modules are arranged at different positions of the compressor bin, and position information is stored in the smell detection modules; the smell detection module is used for detecting the concentration of irritant gas; the frequency conversion fan is arranged at the suction opening; the controller is electrically connected with the smell detection module and the frequency conversion fan; the controller is configured to obtain the concentration of the irritant gas detected by the plurality of smell detection modules; calculating a gas concentration ratio according to the concentration of the irritant gas and the position information; and comparing the gas concentration ratio with a preset concentration condition, and controlling the frequency conversion fan to adjust the operation power according to a comparison result. The concentration of irritant gas is detected in real time through the smell detection module, and the operation power of the frequency conversion fan is controlled according to the irritant concentration, so that the problem that the energy consumption of the anti-rust paint air draft system is large is solved.

Description

Technical Field

[0001] The present application relates to the technical field of refrigerator cabinet compressor exhaust systems, and in particular to a refrigerator cabinet compressor compartment anti-rust paint exhaust system and a control method. Background Art

[0002] During the production of refrigerator cabinets, anti-rust paint is needed to be applied to the compressor pipes after welding to prevent rust at the pipe welding points. Since the paint has a bad smell, considering the production environment of the workshop personnel and other factors, the exhaust system is used to extract and treat the irritating gases in the air.

[0003] Among them, several exhaust ports are set above and around the anti-rust paint application area, and are connected to the outdoor gas treatment device through pipes. After primary and secondary activated carbon treatment, the gas is discharged into the atmosphere. The exhaust system is a fixed-power exhaust fan, which is turned on before work begins and turned off after work is completed. The exhaust fan continues to work during work.

[0004] However, the exhaust system cannot detect the exhaust effect, that is, the irritating odor content in the air cannot be detected; secondly, a fixed-power exhaust fan is used, which is always in the on state, and the energy consumption is large. Summary of the invention

[0005] The present application provides an anti-rust paint exhaust system and a control method for a refrigerator cabinet compressor compartment, so as to solve the problem of high energy consumption of the anti-rust paint exhaust system.

[0006] In a first aspect, the present application provides a refrigerator cabinet compressor compartment anti-rust paint exhaust system, comprising:

[0007] A plurality of odor detection modules, each of which is arranged at different positions of the compressor compartment and stores position information; each of which is used to detect the concentration of irritating gas;

[0008] A variable frequency fan, wherein the variable frequency fan is arranged at the air outlet;

[0009] A controller, the controller being electrically connected to the odor detection module and the variable frequency fan respectively;

[0010] The controller is configured to:

[0011] Obtaining concentrations of irritating gases detected by a number of the odor detection modules;

[0012] Calculating a gas concentration ratio according to the irritating gas concentration and the position information;

[0013] The gas concentration ratio is compared with a preset concentration condition, so as to control the variable frequency fan to adjust the operating power according to the comparison result.

[0014] Optionally, the controller is configured as:

[0015] Obtaining a weight value of the location information and the number of locations of the location information, wherein the greater the distance between the odor detection module and the variable frequency fan, the greater the weight value;

[0016] Calculating the product of the irritant gas concentration and the weight value corresponding to the irritant gas concentration;

[0017] calculating the sum of a number of said products;

[0018] The ratio of the sum to the number of locations is calculated to obtain a gas concentration ratio.

[0019] Optionally, the controller is further configured to:

[0020] If the gas concentration ratio is within a first preset ratio range, controlling the variable frequency fan to operate at 100% operating power;

[0021] If the gas concentration ratio is within the second preset ratio range, controlling the variable frequency fan to operate at 70% operating power;

[0022] If the gas concentration ratio is within a third preset ratio range, controlling the variable frequency fan to operate at 40% operating power;

[0023] If the gas concentration ratio is within a fourth preset ratio range, the variable frequency fan is controlled to operate at 20% operating power.

[0024] Optionally, the first preset ratio range is 30-40%; the second preset ratio range is 20-30%; the third preset ratio range is 10-20%; and the fourth preset ratio range is 0-10%.

[0025] Optionally, the air outlet is connected to a ventilation pipe; a gas purification component is provided at one end of the ventilation pipe away from the air outlet;

[0026] The gas purification component is used for purifying irritating gas.

[0027] Optionally, the gas purification component is any one of plasma waste gas treatment equipment, photo-oxidation catalytic waste gas treatment equipment, and activated carbon adsorption device.

[0028] Optionally, the irritating gas includes a gas mixture of formaldehyde, benzene, toluene and xylene.

[0029] In a second aspect, the present application provides a method for controlling the exhaust of anti-rust paint in a compressor compartment of a refrigerator cabinet, which is applied to the exhaust system for the anti-rust paint in the compressor compartment of a refrigerator cabinet described in the first aspect, comprising:

[0030] Obtaining the concentration of irritating gases detected by several odor detection modules;

[0031] Calculating a gas concentration ratio according to the irritating gas concentration and the position information;

[0032] The gas concentration ratio is compared with a preset concentration condition to control the variable frequency fan to adjust the operating power according to the comparison result.

[0033] Optionally, calculating the gas concentration ratio according to the irritating gas concentration and the position information includes:

[0034] Obtaining a weight value of the location information and the number of locations of the location information, wherein the greater the distance between the odor detection module and the variable frequency fan, the greater the weight value;

[0035] Calculating the product of the irritant gas concentration and the weight value corresponding to the irritant gas concentration;

[0036] calculating the sum of a number of said products;

[0037] The ratio of the sum to the number of locations is calculated to obtain a gas concentration ratio.

[0038] Optionally, comparing the gas concentration ratio with a preset concentration condition, and controlling the variable frequency fan to adjust the operating power according to the comparison result includes:

[0039] If the gas concentration ratio is within a first preset concentration range, controlling the variable frequency fan to operate at 100% operating power;

[0040] If the gas concentration ratio is within the second preset concentration range, controlling the variable frequency fan to operate at 70% operating power;

[0041] If the gas concentration ratio is within a third preset concentration range, controlling the variable frequency fan to operate at 40% operating power;

[0042] If the gas concentration ratio is within a fourth preset concentration range, the variable frequency fan is controlled to operate at 20% operating power.

[0043] It can be seen from the above technical solutions that the present application provides a refrigerator cabinet compressor compartment anti-rust paint exhaust system and control method, the refrigerator cabinet compressor compartment anti-rust paint exhaust system includes: a number of odor detection modules, the odor detection modules are arranged at different positions of the compressor compartment, the odor detection modules store position information; the odor detection module is used to detect the concentration of irritating gases; a variable frequency fan, the variable frequency fan is arranged at the exhaust port; a controller, the controller is electrically connected to the odor detection module and the variable frequency fan respectively; the controller is configured to: obtain the irritating gas concentration detected by the odor detection modules; calculate the gas concentration ratio according to the irritating gas concentration and the position information; compare the gas concentration ratio with the preset concentration condition, so as to control the variable frequency fan to adjust the operating power according to the comparison result. The irritating gas concentration is detected in real time by the odor detection module, and the operating power of the variable frequency fan is controlled according to the irritating concentration, so as to solve the problem of high energy consumption of the anti-rust paint exhaust system. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0045] Figure 1 A schematic diagram of the structure of the anti-rust paint exhaust system for the refrigerator cabinet compressor compartment provided in the embodiment of the present application;

[0046] Figure 2 A schematic diagram of an anti-rust paint exhaust system for a refrigerator cabinet compressor compartment provided in an embodiment of the present application;

[0047] Figure 3 A flow chart of the anti-rust paint exhaust control method for the refrigerator cabinet compressor compartment provided in an embodiment of the present application.

[0048] Reference numerals:

[0049] Among them, 1-odor detection module; 2-variable frequency fan; 3-exhaust port; 4-ventilation duct; 5-gas purification component. DETAILED DESCRIPTION

[0050] The following embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following embodiments do not represent all implementations consistent with the present application. They are only examples of systems and methods consistent with some aspects of the present application as detailed in the claims.

[0051] During the production of refrigerator cabinets, anti-rust paint is needed to be applied to the compressor pipes after welding to prevent rust at the pipe welding points. Since the paint has a bad smell, considering the production environment of the workshop personnel and other factors, the exhaust system is used to extract and treat the irritating gases in the air.

[0052] Among them, a number of exhaust ports 3 are arranged above and around the anti-rust paint application area, and are connected to the outdoor gas treatment device by pipes. After primary and secondary activated carbon treatment, the gas is discharged into the atmosphere. The exhaust system is a fixed-power exhaust fan, which is turned on before the work starts and turned off after the work is completed. The exhaust fan continues to work during the work.

[0053] However, the exhaust system cannot detect the exhaust effect, that is, the irritating odor content in the air cannot be detected; secondly, a fixed-power exhaust fan is used, which is always in the on state, and the energy consumption is large.

[0054] To solve the problem of high energy consumption of the anti-rust paint exhaust system, see Figure 1 and Figure 2 Some embodiments of the present application provide a refrigerator cabinet compressor compartment anti-rust paint exhaust system, including:

[0055] A plurality of odor detection modules 1 are provided at different positions of the compressor compartment, and the odor detection modules 1 store position information; the odor detection modules 1 are used to detect the concentration of irritating gases. A variable frequency fan 2 is provided at the exhaust port 3.

[0056] Specifically, the odor detection module 1 can detect the concentration of irritating gases in the air. The variable frequency fan 2 is a device that can adjust the operating power as needed. The operating power of the variable frequency fan 2 can be adjusted according to the gas concentration detected by the odor detection module 1.

[0057] The odor detection module 1 is set at different positions in the compressor compartment. By recording the position information of each odor detection module 1, the distance from the odor detection module 1 to the variable frequency fan 2 is obtained. When the odor module farther away from the variable frequency fan 2 detects a greater concentration of irritating gas, it means that the power of the variable frequency fan 2 needs to be increased to extract the irritating gas as soon as possible.

[0058] A controller, the controller is electrically connected to the odor detection module 1 and the variable frequency fan 2 respectively;

[0059] The controller is configured as:

[0060] Obtaining the concentrations of irritating gases detected by a plurality of odor detection modules 1;

[0061] Calculate the gas concentration ratio based on the irritating gas concentration and location information;

[0062] The gas concentration ratio is compared with the preset concentration condition, and the variable frequency fan 2 is controlled to adjust the operating power according to the comparison result.

[0063] The controller is responsible for receiving and processing the irritating gas concentration from the odor detection module 1, and then calculating the gas concentration ratio based on the irritating gas concentration and the position information stored in the odor detection module 1. At the same time, the controller is also connected to the variable frequency fan 2, and can send control instructions to control the variable frequency fan 2 to operate in different cooling modes.

[0064] The controller first obtains data from the odor detection module 1 to understand the current gas concentration in the compressor compartment. Then, the controller calculates a gas concentration ratio based on the location information. Finally, the controller compares the calculated gas concentration ratio with the preset concentration condition. If the ratio exceeds the preset condition, the controller will instruct the variable frequency fan 2 to increase the operating power to exhaust these irritating gases through the variable frequency fan 2. This ensures that the air quality in the compressor compartment is maintained at a safe and comfortable level while saving energy as much as possible.

[0065] In some embodiments, the controller is configured to:

[0066] Obtain the weight value of the location information and the number of locations of the location information. The greater the distance between the odor detection module 1 and the variable frequency fan 2, the greater the weight value.

[0067] Calculate the product of the irritant gas concentration and the weight value corresponding to the irritant gas concentration;

[0068] Calculate the sum of several products;

[0069] Calculate the ratio of the sum to the number of locations to get the gas concentration ratio.

[0070] Among them, when the irritating gas is discharged out of the compressor compartment through the variable frequency fan 2, the position close to the variable frequency fan 2 will have a lower concentration of the irritating gas detected by the odor detection module 1 due to the faster wind speed, while the position far away from the variable frequency fan 2 will have a higher concentration of the irritating gas due to long-term deposition. Therefore, the odor detection module 1 can be set at different positions in the compressor compartment, and then the irritating gas concentrations detected by multiple odor detection modules 1 at different positions are calculated, and then the power of the variable frequency fan 2 is adjusted.

[0071] Specifically, when the distance between the odor detection module 1 and the variable frequency fan 2 is farther, the weight of the irritating gas concentration detected by the odor detection module 1 is greater in calculating the gas concentration ratio. For example, three odor detection modules 1 are provided, which are respectively recorded as the first odor detection module 1, the second odor detection module 1, and the third odor detection module 1. Among them, the distance between the first odor detection module 1 and the variable frequency fan 2 is a, the distance between the second odor detection module 1 and the variable frequency fan 2 is b, and the distance between the third odor detection module 1 and the variable frequency fan 2 is c, and a<b<c. ​​That is, the weight value of the irritating gas concentration detected by the first odor detection module 1 is d, that is, the weight value of the irritating gas concentration detected by the first odor detection module 1 is e, that is, the weight value of the irritating gas concentration detected by the first odor detection module 1 is f, then d<e<f.

[0072] It can be understood that the formula for calculating the gas concentration ratio is

[0073] Where M is the gas concentration ratio; g n g is the irritant gas concentration detected by the nth gas detection module; n is the weight value of the nth gas detection module; n is the number of locations.

[0074] By calculating the gas concentration ratio, a more accurate content of irritating gas in the compressor compartment can be obtained, and then the operating power of the variable frequency fan 2 can be controlled according to the gas concentration ratio. When the content of irritating gas in the compressor compartment is high, the operating power of the compressor compartment can be increased. When the content of irritating gas in the compressor compartment is low, the operating power of the compressor compartment can be reduced, so that the variable frequency fan 2 can operate at different operating powers under different conditions to reduce power consumption.

[0075] In some embodiments, the controller is further configured to:

[0076] If the gas concentration ratio is within the first preset ratio range, the variable frequency fan 2 is controlled to operate at 100% operating power;

[0077] If the gas concentration ratio is within the second preset ratio range, the variable frequency fan 2 is controlled to operate at 70% operating power;

[0078] If the gas concentration ratio is within the third preset ratio range, the variable frequency fan 2 is controlled to operate at 40% operating power;

[0079] If the gas concentration ratio is within the fourth preset ratio range, the variable frequency fan 2 is controlled to operate at 20% operating power.

[0080] Among them, the first preset ratio range is 30-40%; the second preset ratio range is 20-30%; the third preset ratio range is 10-20%; and the fourth preset ratio range is 0-10%.

[0081] Specifically, when the controller receives the irritating gas concentration, it will store the position information of the irritating gas concentration in the corresponding odor detection module 1, and obtain the weight value according to the position information, and then calculate the gas concentration ratio according to the weight value and the irritating gas concentration, and finally compare the gas concentration ratio with the preset concentration condition stored in the controller. When the gas concentration ratio calculated by the real-time detected irritating gas concentration is within the first preset ratio range, the controller sends a signal to the variable frequency fan 2 to make the variable frequency fan 2 run at 100% operating power. At this time, the exhaust volume of the variable frequency fan 2 is the maximum. When the gas concentration ratio calculated by the real-time detected irritating gas concentration is within the second preset concentration range, the controller sends a signal to the variable frequency fan 2 to make the variable frequency fan 2 run at 70% operating power, that is, 70% of the maximum exhaust volume. When the gas concentration ratio calculated by the real-time detected irritating gas concentration is within the third preset concentration range, the controller sends a signal to the variable frequency fan 2 to make the variable frequency fan 2 run at 40% operating power, that is, 40% of the maximum exhaust volume. When the gas concentration ratio calculated from the real-time detected irritant gas concentration is within the fourth preset concentration range, the controller sends a signal to the variable frequency fan 2 to operate the variable frequency fan 2 at 10% operating power, i.e. 10% of the maximum exhaust volume.

[0082] By controlling the operating power of the variable frequency fan 2, it operates according to the actual situation in the compressor compartment to achieve the effect of reducing energy consumption.

[0083] In some embodiments, Figure 1 As shown, the air outlet 3 is connected to a ventilation pipe 4; a gas purification component 5 is provided at one end of the ventilation pipe 4 away from the air outlet 3;

[0084] The gas purification component 5 is used to purify irritating gases. When the variable frequency blower 2 draws air, the irritating gases can be discharged from the compressor compartment.

[0085] The gas purification component 5 is any one of a plasma waste gas treatment device, a photocatalytic waste gas treatment device, and an activated carbon adsorption device.

[0086] Specifically, the plasma waste gas treatment equipment uses high-energy electrons, free radicals and other active particles and pollutants in the irritating gas to decompose the molecules in the irritating gas in a very short time, and then various subsequent reactions occur to degrade the harmful substances in the irritating gas.

[0087] Photocatalytic waste gas treatment equipment uses ultraviolet light sources to irradiate irritating gases, and combines the action of catalysts to convert harmful substances in irritating gases into harmless substances.

[0088] The activated carbon in the activated carbon adsorption device has rich microporous structure and large specific surface area, which can effectively adsorb harmful gases such as formaldehyde, benzene, toluene, xylene, etc. in irritating gases. However, it should be noted that the adsorption capacity of activated carbon is limited. When the adsorption is saturated, it may cause secondary pollution, so it needs to be replaced regularly.

[0089] In some embodiments, the irritant gas includes a gas mixture of formaldehyde, benzene, toluene, and xylene.

[0090] In some embodiments, Figure 3 As shown, the embodiment of the present application provides a refrigerator cabinet compressor compartment anti-rust paint exhaust control method, which is applied to the refrigerator cabinet compressor compartment anti-rust paint exhaust system provided in the above embodiment, including:

[0091] S100: Obtaining the concentration of irritating gases detected by a plurality of odor detection modules 1;

[0092] S200: Calculate the gas concentration ratio according to the irritating gas concentration and the position information;

[0093] S300: Compare the gas concentration ratio with a preset concentration condition, and control the variable frequency fan 2 to adjust the operating power according to the comparison result.

[0094] In some embodiments, calculating the gas concentration ratio according to the irritant gas concentration and the position information includes:

[0095] Obtain the weight value of the location information and the number of locations of the location information. The greater the distance between the odor detection module 1 and the variable frequency fan 2, the greater the weight value.

[0096] Calculate the product of the irritant gas concentration and the weight value corresponding to the irritant gas concentration;

[0097] Calculate the sum of several products;

[0098] Calculate the ratio of the sum to the number of locations to get the gas concentration ratio.

[0099] In some embodiments, comparing the gas concentration ratio with a preset concentration condition, and controlling the variable frequency fan 2 to adjust the operating power according to the comparison result includes:

[0100] If the gas concentration ratio is within the first preset concentration range, the variable frequency fan 2 is controlled to operate at 100% operating power;

[0101] If the gas concentration ratio is within the second preset concentration range, the variable frequency fan 2 is controlled to operate at 70% operating power;

[0102] If the gas concentration ratio is within the third preset concentration range, the variable frequency fan 2 is controlled to operate at 40% operating power;

[0103] If the gas concentration ratio is within the fourth preset concentration range, the variable frequency fan 2 is controlled to operate at 20% operating power.

[0104] It can be seen from the above technical solutions that the present application provides a refrigerator cabinet compressor compartment anti-rust paint exhaust system and control method, the refrigerator cabinet compressor compartment anti-rust paint exhaust system includes: a number of odor detection modules 1, the odor detection module 1 is set at different positions of the compressor compartment, and the odor detection module 1 stores position information; the odor detection module 1 is used to detect the concentration of irritating gas; the variable frequency fan 2, the variable frequency fan 2 is set at the exhaust port 3; the controller, the controller is electrically connected to the odor detection module 1 and the variable frequency fan 2 respectively; the controller is configured to: obtain the irritating gas concentration detected by the odor detection modules 1; calculate the gas concentration ratio according to the irritating gas concentration and the position information; compare the gas concentration ratio with the preset concentration condition, and control the variable frequency fan 2 to adjust the operating power according to the comparison result. The irritating gas concentration is detected in real time by the odor detection module 1, and the operating power of the variable frequency fan 2 is controlled according to the irritating concentration, so as to solve the problem of high energy consumption of the anti-rust paint exhaust system.

[0105] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the general concept of this application and do not constitute a limitation on the protection scope of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without creative work belong to the protection scope of this application.

Claims

1. A refrigerator cabinet compressor compartment anti-rust paint exhaust system, characterized in that: include: A plurality of odor detection modules, wherein the odor detection modules are arranged at different positions in the compressor compartment, and the odor detection modules store position information; The odor detection module is used to detect the concentration of irritating gases; A variable frequency fan, wherein the variable frequency fan is arranged at the air outlet; A controller, the controller being electrically connected to the odor detection module and the variable frequency fan respectively; The controller is configured to: Obtaining concentrations of irritating gases detected by a number of the odor detection modules; Calculating a gas concentration ratio according to the irritating gas concentration and the position information; The gas concentration ratio is compared with a preset concentration condition, so as to control the variable frequency fan to adjust the operating power according to the comparison result.

2. The refrigerator cabinet compressor compartment anti-rust paint exhaust system according to claim 1, characterized in that: The controller is configured to: Obtaining a weight value of the location information and the number of locations of the location information, wherein the greater the distance between the odor detection module and the variable frequency fan, the greater the weight value; Calculating the product of the irritant gas concentration and the weight value corresponding to the irritant gas concentration; calculating the sum of a number of said products; The ratio of the sum to the number of locations is calculated to obtain a gas concentration ratio.

3. The refrigerator cabinet compressor compartment anti-rust paint exhaust system according to claim 1, characterized in that: The controller is also configured to: If the gas concentration ratio is within a first preset ratio range, controlling the variable frequency fan to operate at 100% operating power; If the gas concentration ratio is within the second preset ratio range, controlling the variable frequency fan to operate at 70% operating power; If the gas concentration ratio is within a third preset ratio range, controlling the variable frequency fan to operate at 40% operating power; If the gas concentration ratio is within a fourth preset ratio range, the variable frequency fan is controlled to operate at 20% operating power.

4. The refrigerator cabinet compressor compartment anti-rust paint exhaust system according to claim 3, characterized in that: The first preset ratio range is 30-40%; the second preset ratio range is 20-30%; the third preset ratio range is 10-20%; and the fourth preset ratio range is 0-10%.

5. The refrigerator cabinet compressor compartment anti-rust paint exhaust system according to claim 1, characterized in that: The air outlet is connected to a ventilation pipe; a gas purification component is provided at one end of the ventilation pipe away from the air outlet; The gas purification component is used for purifying irritating gas.

6. The refrigerator cabinet compressor compartment anti-rust paint exhaust system according to claim 1, characterized in that: The gas purification component is any one of plasma waste gas treatment equipment, photocatalytic waste gas treatment equipment, and activated carbon adsorption device.

7. The refrigerator cabinet compressor compartment anti-rust paint exhaust system according to claim 1, characterized in that: The irritating gas includes a gas mixture of formaldehyde, benzene, toluene and xylene.

8. A method for controlling the exhaust of anti-rust paint in a refrigerator compressor compartment, applied to the refrigerator compressor compartment anti-rust paint exhaust system according to any one of claims 1 to 7, characterized in that: include: Obtaining the concentration of irritating gases detected by several odor detection modules; Calculating a gas concentration ratio according to the irritating gas concentration and the position information; The gas concentration ratio is compared with a preset concentration condition to control the variable frequency fan to adjust the operating power according to the comparison result.

9. The method for controlling the rust-proof paint exhaust of a refrigerator compressor compartment according to claim 8, characterized in that: Calculating the gas concentration ratio according to the irritating gas concentration and the position information includes: Obtaining a weight value of the location information and the number of locations of the location information, wherein the greater the distance between the odor detection module and the variable frequency fan, the greater the weight value; Calculating the product of the irritant gas concentration and the weight value corresponding to the irritant gas concentration; calculating the sum of a number of said products; The ratio of the sum to the number of locations is calculated to obtain a gas concentration ratio.

10. The method for controlling the exhaust of anti-rust paint in the compressor compartment of a refrigerator cabinet according to claim 8, characterized in that: Comparing the gas concentration ratio with a preset concentration condition, and controlling the variable frequency fan to adjust the operating power according to the comparison result includes: If the gas concentration ratio is within a first preset concentration range, controlling the variable frequency fan to operate at 100% operating power; If the gas concentration ratio is within the second preset concentration range, controlling the variable frequency fan to operate at 70% operating power; If the gas concentration ratio is within a third preset concentration range, controlling the variable frequency fan to operate at 40% operating power; If the gas concentration ratio is within a fourth preset concentration range, the variable frequency fan is controlled to operate at 20% operating power.

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