Dust remover upper box body and dust remover system

Abstract

The utility model relates to an upper box body of a dust remover and a dust remover system. An upper cover covers the upper end of a main body of the upper box body and seals the upper end of the main body of the upper box body; a sealing cavity is formed between the first layer of sealing plate and the second layer of sealing plate of the upper cover, and gas can be introduced into the sealing cavity through the gas inlet, so that the gas pressure in the sealing cavity is increased to a preset value. Therefore, according to the upper box body of the dust remover, the micro-positive pressure of the upper cover can be kept in a normal state, the possibility that external air enters the upper box body of the dust remover is greatly reduced, the maintenance cost of the dust remover is reduced, and the service life of the dust remover is prolonged.

Description

Technical Field

[0001] This application relates to the field of waste gas treatment technology, and in particular to an upper housing of a dust collector and a dust collector system. Background Technology

[0002] The flue gas from the incineration of solid waste such as municipal solid waste, hazardous waste, and sludge contains a large amount of hydrogen chloride gas, sulfur dioxide gas, and moisture. Although insulation and heat tracing measures are taken when conventional high-temperature bag filters are in operation, problems such as shell rusting, blowpipe corrosion, and filter bag caking failure often occur during the operation of the project, which seriously affect the safe and reliable operation of dust removal and even the entire system.

[0003] In existing technologies, the original single-layer welded fixed insulation of the upper cover of the bag filter has been replaced with a multi-layer movable insulation layer between the inner and outer covers. This has improved the internal corrosion caused by defects in insulation and welding, thus extending the service life of the dust collector. However, it still does not fundamentally solve the problem of micro-air leakage in the double-layer cover. Furthermore, during dust collector operation, the insulation rock wool blanket in the double-layer cover absorbs corrosive moisture from both cold external air and high-temperature, high-humidity combustion flue gas. After absorbing water, the insulation rock wool blanket's weight increases significantly, its physical properties decline, and bacteria grow, increasing maintenance costs and potentially harming the health of maintenance personnel. Utility Model Content

[0004] In view of this, the present application provides a dust collector upper housing, a dust collector system and a control method thereof to solve the problems existing in dust collectors in the background art.

[0005] In a first aspect, embodiments of this application provide an upper housing for a dust collector, comprising:

[0006] The upper housing body is used to connect to the main fan to discharge the gas after dust removal, and the lower end of the upper housing body is used to connect to the dust removal housing.

[0007] The upper cover covers the upper end of the upper housing body, sealing the upper end of the upper housing body. The upper cover includes a first sealing plate and a second sealing plate. The first sealing plate forms the top of the upper cover, and the second sealing plate forms the bottom of the upper cover. Both the first and second sealing plates are embedded inside the upper end of the upper housing body, and the interlayer between the first and second sealing plates forms a sealed cavity. One side of the upper housing body or the upper cover has an air inlet, through which gas can be continuously introduced into the sealed cavity to raise the air pressure in the sealed cavity to a preset level.

[0008] In an optional embodiment, the upper housing of the dust collector further includes a pressure gauge for measuring the air pressure inside the sealed cavity.

[0009] In an optional embodiment, the pressure gauge is a pointer-type differential pressure gauge or a U-type pressure gauge.

[0010] Secondly, this application provides a dust collector system, including the dust collector upper housing 300 as described in the first aspect, and also including a dust collector housing, a main fan, a dust collector outlet duct, a main fan outlet duct, and a hot air circulation duct.

[0011] The dust collection box is connected to the lower end of the upper box of the dust collector, and the gas after dust removal by the dust collection box flows into the upper box of the dust collector.

[0012] The air inlet of the main fan is connected to the upper housing body through the dust collector outlet pipe, which is used to draw away the gas in the upper housing body. The exhaust end of the main fan discharges the gas through the main fan outlet pipe.

[0013] The air inlet of the hot air circulation duct is connected to the air outlet of the main fan, and the air outlet of the hot air circulation duct is connected to the air inlet.

[0014] In an optional embodiment, the dust collector system further includes a regulating valve connected to the hot air circulation duct, the regulating valve being used to regulate the flow rate of the hot air circulation duct.

[0015] In an optional embodiment, the hot air circulation duct is a tapered duct, with the air inlet end of the hot air circulation duct as the starting point, and the inner diameter of the hot air circulation duct gradually decreases along its airflow direction within a certain length.

[0016] In an optional embodiment, the hot air circulation duct includes several branches, each branch is equipped with the regulating valve, the sealed cavity is divided into several compartments, each branch is connected to the corresponding compartment, and the regulating valve on each branch can be opened and closed independently.

[0017] In an optional embodiment, the hot air circulation duct is covered with a first insulation layer.

[0018] In an optional embodiment, the upper housing of the dust collector and the exterior of the dust collection housing are covered with a second insulation layer.

[0019] In an optional embodiment, the dust collector system further includes a booster fan connected to a hot air circulation duct.

[0020] Thirdly, embodiments of this application provide a control method for a dust collector system, employing the dust collector system described in the second aspect, comprising the following steps:

[0021] A preset proportion of the total amount of gas discharged from the main fan outlet duct is introduced into the sealed cavity through the hot air circulation duct.

[0022] In an optional embodiment, the control method for the dust collector system provided in this application includes the following steps:

[0023] A regulating valve is connected to the hot air circulation duct to regulate the flow rate of the hot air circulation duct, and a pressure gauge is used to monitor the pressure inside the sealed cavity.

[0024] The adjustment of the regulating valve will stop once the pressure value measured by the pressure gauge reaches the preset range.

[0025] The dust collector upper housing and dust collector system provided in this application embodiment have an upper cover that covers the upper end of the upper housing body, sealing the upper end of the upper housing body. A sealed cavity is formed between the first and second sealing plates of the upper cover. Gas can be introduced into the sealed cavity through the air inlet to raise the air pressure in the sealed cavity to a preset level. Therefore, the upper cover can maintain a slight positive pressure under normal conditions, significantly reducing the possibility of external air entering the dust collector upper housing, reducing the maintenance cost of the dust collector, and extending the service life of the dust collector.

[0026] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0028] Figure 1 This is a schematic diagram of the dust collector system structure provided in the embodiments of this application;

[0029] Figure 2 This is a schematic diagram of the cross-sectional structure of the upper casing of the dust collector provided in an embodiment of this application;

[0030] Figure 3 This is a schematic diagram of the layout of multiple compartments of the sealed cavity provided in the embodiments of this application.

[0031] The attached figures are labeled as follows:

[0032] 1. Upper box body;

[0033] 2. Top cover; 20. Sealed cavity; 21. Air inlet; 22. Compartment;

[0034] 3. Pressure gauge;

[0035] 100. Dust collector housing; 101. Air inlet; 102. Second insulation layer; 103. Ash discharge valve;

[0036] 200. Main fan;

[0037] 300. Upper housing of dust collector; 301. Air outlet; 302. First sealing plate; 303. Second sealing plate;

[0038] 400. Dust collector outlet duct;

[0039] 500. Main fan outlet duct;

[0040] 600. Hot air circulation duct;

[0041] 700. Control valve;

[0042] 800. Exhaust duct. Detailed Implementation

[0043] To make the technical solution and beneficial effects of this utility model more apparent and understandable, a detailed description is provided below by listing specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0044] In the description of this utility model, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. In other words, they should not be construed as limitations on this utility model.

[0045] In this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" can explicitly indicate that at least one of those features is included. In the description of this utility model, "multiple" means at least two, such as two, three, etc.; "several" means at least one, such as one, two, three, etc., unless otherwise explicitly specified.

[0046] In this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "linking," "fixing," and "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] In this utility model, unless otherwise explicitly defined, the terms "above," "on top of," "above," "over," "below," "below," "below," or "below" for "first feature above second feature" can refer to direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Furthermore, "above," "above," and "over" for "first feature above second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature below second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0048] To fully understand this application, detailed steps and structures will be presented in the following description to illustrate the technical solution of this application. Preferred embodiments of this application are described in detail below; however, in addition to these detailed descriptions, this application may have other implementation methods.

[0049] A dust collector is a gas purification device. Its working principle is as follows: The dust collector's outlet duct 400 is connected to a main fan 200, which serves as the power source. When the main fan 200 starts, the gas to be purified enters through the dust collector's inlet 101. After being filtered by the dust collector's housing 100, the purified gas reaches the upper housing 300 of the dust collector, then flows through the dust collector's outlet 301 into the dust collector's outlet duct 400, and then sequentially passes through the main fan 200, the main fan's outlet duct 500, and the exhaust duct 800 before being discharged. Retained dust is discharged from the ash discharge valve 103 at the bottom of the dust collector housing 100. The dust collector includes a dust collection housing 100 and an upper dust collector housing 300. Due to the need for disassembly, maintenance, and repair, the upper dust collector housing 300 is usually not a one-piece structure. There are some seams between the wall of the upper housing body 1 and the edge of the upper cover 2. When the dust collector is running, because the upper dust collector housing 300 is close to the air outlet 301, there is a relatively obvious slight negative pressure. External cold air can easily penetrate into the above seams, causing condensation and corrosion inside the upper dust collector housing 300.

[0050] This application provides an upper housing 300 for a dust collector, such as... Figure 1 , Figure 2 As shown, it includes an upper housing body 1 and an upper cover 2. The upper housing body 1 is used to connect to the main fan 200 to discharge the gas after dust removal, and the lower end of the upper housing body 1 is used to connect to the dust removal box 100; the upper cover 2 covers the upper end of the upper housing body 1 and seals the upper end of the upper housing body 1.

[0051] In this embodiment, the upper cover 2 includes a first sealing plate 302 and a second sealing plate 303. The first sealing plate 302 forms the top of the upper cover 2, and the second sealing plate 303 forms the bottom of the upper cover 2. Both the first sealing plate 302 and the second sealing plate 303 are embedded inside the upper part of the upper housing body 1. The interlayer between the first sealing plate 302 and the second sealing plate 303 forms a sealed cavity 20. An air inlet 21 is provided on one side of the upper housing body 1, and the location of the air inlet 21 communicates with the sealed cavity 20. In other embodiments, the air inlet 21 may also be provided on the first sealing plate 302 or the second sealing plate 303, or the upper cover 2 may be completely sealed on the outside, forming a sealed cavity 20 inside, with the air inlet 21 located on the outer layer of the upper cover 2.

[0052] Gas can be introduced into the sealed cavity 20 through the air inlet 21 to increase the air pressure inside the sealed cavity 20.

[0053] The dust collector upper housing 300 provided in this embodiment allows gas to be introduced into the sealed cavity 20 through the air inlet 21 during operation, which can raise the air pressure inside the sealed cavity 20 to a preset level. Therefore, the upper cover 2 can maintain a slight positive pressure under normal conditions, significantly reducing the possibility of external air entering the dust collector upper housing 300, reducing the maintenance cost of the dust collector, and extending the service life of the dust collector.

[0054] The dust collector upper housing 300 provided in this embodiment is designed to prevent air leakage as follows: Figure 2As shown, the upper part of the upper housing 1 is sealed by the upper cover 2. One side of the upper housing 1 is connected to the main fan 200, and the lower end is connected to the dust collector housing 100. Therefore, the high-temperature gas purified by the dust collector housing 100 circulates within the purification area of ​​the upper housing 1, creating a slight negative pressure. At this time, it is necessary to prevent cold air from entering the purification area of ​​the upper housing 1 and condensing. External air entering the purification area of ​​the upper housing 1 needs to pass through the seam between the upper cover 2 and the inner wall of the upper housing 1. In this embodiment, when the upper housing 300 of the dust collector is running, gas is introduced into the sealed cavity 20 through the air inlet 21, which increases the air pressure inside the sealed cavity 20, creating a slight positive pressure. Continuously introducing gas into the sealed cavity 20 maintains this slight positive pressure, making it difficult for external air to enter the seam. This slight positive pressure refers to an air pressure slightly greater than the ambient atmospheric pressure of the factory area where the dust collector is located, generally calculated based on geographical location, altitude, and other information. On the other hand, due to the slight positive pressure formed in the sealed cavity 20, gas may leak into the purification area of ​​the upper chamber body 1. However, the gas introduced into the sealed cavity 20 is selectable, as long as it is a gas that is harmless to the purified gas. Therefore, in the dust collector upper chamber 300 provided in this embodiment, the purified high-temperature gas flowing within the upper chamber body 1 is less susceptible to leakage from external cold air, and the condensation within the upper chamber body 1, as well as the resulting component corrosion and bacterial hazards, can be significantly improved.

[0055] In an optional embodiment, the upper housing 300 of the dust collector further includes a pressure gauge 3 for measuring the air pressure inside the sealed cavity 20. In this embodiment, by setting the pressure gauge 3, the air pressure inside the sealed cavity 20 can be monitored, ensuring that the pressure of the sealed cavity 20 is visible during the operation of the dust collector. This avoids the inability to detect damage or malfunction of the micro-positive pressure air supply environment in a timely manner, or facilitates the quantification of the micro-positive pressure environment, making it easier to calculate the required flow rate of the introduced gas. The pressure gauge 3 can be connected to the upper cover 2 or to the side wall of the upper housing body 1.

[0056] In an optional embodiment, the pressure gauge 3 is either a pointer-type differential pressure gauge or a U-type pressure gauge. The pointer-type differential pressure gauge can accurately display the measured pressure and is suitable for applications requiring high accuracy in pressure measurement. The U-type pressure gauge has a simple structure and low cost, and is suitable for applications requiring lower accuracy in pressure measurement. Technicians can select the appropriate pressure gauge 3 according to specific needs.

[0057] In an alternative embodiment, such as Figure 1 As shown, the dust collector provided in this embodiment is covered with a second insulation layer 102, which can keep the temperature of the gas flowing inside warm.

[0058] This embodiment provides a dust collector system, such as Figure 1As shown, the dust collector includes the upper housing 300, a dust collector housing 100, a main fan 200, a dust collector outlet duct 400, a main fan outlet duct 500, and a hot air circulation duct 600. The dust collector housing 100 is connected to the lower end of the upper housing 300, and the gas removed by the dust collector housing 100 flows into the upper housing 300. The inlet of the main fan 200 is connected to the upper housing body 1 through the dust collector outlet duct 400, and is used to draw gas from the upper housing body 1. The exhaust of the main fan 200 is discharged through the main fan outlet duct 500. The inlet of the hot air circulation duct 600 is connected to the main fan outlet duct 500, and the exhaust of the hot air circulation duct 600 is connected to the inlet 21.

[0059] The dust collector system provided in this embodiment uses the aforementioned upper housing 300. During operation, gas is introduced into the sealed cavity 20 through the air inlet 21, which increases the air pressure inside the sealed cavity 20. Therefore, the upper cover 2 can maintain a slight positive pressure under normal conditions, significantly reducing the possibility of external air entering the upper housing 300 of the dust collector, reducing the maintenance cost of the dust collector, and extending its service life. When introducing gas into the sealed cavity 20, the gas discharged from the main fan outlet duct 500 is used and introduced into the sealed cavity 20 through the hot air circulation duct 600. This achieves the reuse of the discharged gas without introducing a new gas source, reducing process costs. Furthermore, the temperature of the reused gas is relatively high, making it less likely to cause condensation inside the upper housing body 1.

[0060] In an alternative embodiment, such as Figure 1 As shown, the dust collector system also includes a regulating valve 700 connected to the hot air circulation duct 600. The regulating valve 700 is used to regulate the flow rate of the hot air circulation duct 600. In this embodiment, the engineer can adjust the opening of the regulating valve 700 according to the preset pressure of the sealed cavity 20 to ensure that the sealed cavity 20 reaches a slightly positive pressure at the preset pressure.

[0061] In an optional embodiment, the hot air circulation duct 600 is a tapered pipe. Starting from the air inlet end of the hot air circulation duct 600, the inner diameter of the hot air circulation duct 600 gradually decreases along its airflow direction within a certain length. In this embodiment, the hot air circulation duct 600 adopts a tapered pipe, which allows the passage of circulating gas to have a structure that gradually decreases in size, so that the flow rate of gas in the passage gradually decreases per unit time. This ensures that, on the one hand, only a small amount of the required gas is introduced into the sealed cavity 20, and on the other hand, it makes it easier for the gas pressure to be introduced into the sealed cavity 20 to gradually increase within the hot air circulation duct 600.

[0062] In an alternative embodiment, such as Figure 3As shown, the hot air circulation duct 600 includes four branches, each branch equipped with a regulating valve 700. The sealed cavity 20 is divided into four chambers 22, each branch connecting to its corresponding chamber 22. The regulating valve 700 on each branch can be opened and closed independently. In this embodiment, the sealed cavity 20 is divided into four chambers 22, each chamber 22 connected to an independent branch of the hot air circulation duct 600 and equipped with an independent regulating valve 700. Therefore, the gas flow into any chamber 22 can be controlled individually. This allows the regulating valve 700 of any chamber 22 to be completely closed when it needs offline maintenance, without affecting the hot air supply to other chambers 22. It is understood that the number of chambers 22 is not limited to four; it can be two, three, six, eight, nine, or more.

[0063] In an optional embodiment, the hot air circulation duct 600 in the dust collector system of this embodiment is covered with a first insulation layer, which can keep the circulating hot airflow at a high temperature in the hot air circulation duct 600, which helps to reduce the risk of condensation when it enters the sealed cavity 20.

[0064] In an optional embodiment, the dust collector system of this embodiment is further provided with a booster fan, which is connected to the hot air circulation duct 600 to pressurize the gas flowing in the hot air circulation duct 600 and accelerate the gas transmission speed. This is to increase the upper limit of the amount of gas that can flow through the hot air circulation duct 600 and avoid the situation where the amount of gas entering the sealed cavity 20 is insufficient.

[0065] This embodiment provides a control method for a dust collector system. Using the aforementioned dust collector system, the method includes the following steps: A preset proportion of the total gas discharged from the main fan outlet duct 500 is introduced into the sealed cavity 20 through the hot air circulation duct 600. In this embodiment, the gas flow rate introduced into the sealed cavity 20 is determined by the proportion of the total gas discharged from the main fan outlet duct 500, which is beneficial for matching various scales of dust collection operations. For example, 2% to 5% of the gas discharged from the main fan outlet duct 500 is introduced into the sealed cavity 20. It is understood that for different dust collection operations, the amount of gas required to be introduced into the sealed cavity 20 to meet the need for a slight positive pressure within the sealed cavity 20 varies. Therefore, the proportion of gas introduced into the sealed cavity 20 is not limited to 2% to 5% of the gas discharged from the main fan outlet duct 500; it can be 1% to 2% or less than 1%, or it can be greater than 5%, such as 6%, 8%, or even higher.

[0066] The control method for the dust collector system provided in this embodiment employs the aforementioned dust collector system. During operation, gas is introduced into the sealed cavity 20 through the air inlet 21, which increases the air pressure inside the sealed cavity 20. Therefore, the upper cover 2 can maintain a slight positive pressure under normal conditions, significantly reducing the possibility of external air entering the upper housing 300 of the dust collector, reducing the maintenance cost of the dust collector, and extending its service life. The gas flow rate introduced into the sealed cavity 20 is determined by the proportion of the total gas discharged from the main fan outlet duct 500, which is beneficial for matching various scales of dust collection operations.

[0067] In an optional embodiment, the control method of the dust collector system of this embodiment includes the following steps: connecting a regulating valve 700 to the hot air circulation duct 600, connecting a pressure gauge 3 to the upper cover 2, adjusting the flow rate of the hot air circulation duct 600 through the regulating valve 700, and monitoring the pressure inside the sealed cavity 20 through the pressure gauge 3; stopping the adjustment of the regulating valve 700 when the pressure value measured by the pressure gauge 3 reaches a preset range. In this embodiment, the pressure inside the sealed cavity 20 is monitored by the pressure gauge 3. When the pressure inside the sealed cavity 20 reaches a preset value, it indicates that the current pressure inside the sealed cavity 20 meets the micro-positive pressure requirement, and the specific pressure is adjusted by the regulating valve 700, which has high adjustability. The regulating valve 700 can be manually adjusted by the engineer according to the measurement value of the pressure gauge 3; the regulating valve 700 can also be PID controlled by selecting a regulating valve 700 that supports electrical signal control and a pressure gauge 3 that supports electrical signal transmission, so that the measurement value of the pressure gauge 3 directly and automatically adjusts the opening of the regulating valve 700. When the hot air circulation duct 600 includes multiple branches, each branch is equipped with a regulating valve 700, the sealed cavity 20 is divided into a corresponding number of compartments 22, each branch is connected to the corresponding compartment 22, and the regulating valve 700 set in each branch can be opened and closed independently.

[0068] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this application that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of this application and do not limit the scope of protection of this patent application.

Claims

1. A dust collector upper housing, characterized in that, include: Upper housing body (1), the upper housing body (1) is used to connect to the main fan (200) to discharge the gas after dust removal, and the lower end of the upper housing body (1) is used to connect to the dust removal box (100); The upper cover (2) covers the upper end of the upper box body (1) and seals the upper end of the upper box body (1). The upper cover (2) includes a first sealing plate (302) and a second sealing plate (303). The first sealing plate (302) forms the top of the upper cover (2), and the second sealing plate (303) forms the bottom of the upper cover (2). The first sealing plate (302) and the second sealing plate (303) are both embedded in the interior of the upper end of the upper box body (1). The interlayer between the first sealing plate (302) and the second sealing plate (303) forms a sealed cavity (20). One side of the upper box body (1) or the upper cover (2) has an air inlet (21). Gas can be continuously introduced into the sealed cavity (20) through the air inlet (21) so that the air pressure in the sealed cavity (20) rises to a preset value.

2. The upper housing of the dust collector according to claim 1, characterized in that, The dust collector upper housing (300) also includes a pressure gauge (3) for measuring the air pressure inside the sealed cavity (20).

3. The upper housing of the dust collector according to claim 2, characterized in that, The pressure gauge (3) is a pointer-type differential pressure gauge or a U-type pressure gauge.

4. A dust collector system, characterized in that, The dust collector includes the upper housing (300) as described in any one of claims 1-3, and also includes a dust collector housing (100), a main fan (200), a dust collector outlet duct (400), a main fan outlet duct (500), and a hot air circulation duct (600). The dust removal box (100) is connected to the lower end of the upper box (300) of the dust collector, and the gas after dust removal by the dust removal box (100) flows into the upper box (300) of the dust collector; The air inlet of the main fan (200) is connected to the upper housing body (1) through the dust collector outlet pipe (400) to draw away the gas in the upper housing body (1), and the exhaust end of the main fan (200) discharges the gas through the main fan outlet pipe (500). The air inlet of the hot air circulation duct (600) is connected to the air outlet of the main fan (500), and the exhaust end of the hot air circulation duct (600) is connected to the air inlet (21).

5. The dust collector system according to claim 4, characterized in that, The dust collector system also includes a regulating valve (700) connected to the hot air circulation duct (600), the regulating valve (700) being used to regulate the flow rate of the hot air circulation duct (600).

6. The dust collector system according to claim 5, characterized in that, The hot air circulation duct (600) is a tapered duct. Starting from the air inlet end of the hot air circulation duct (600), the inner diameter of the hot air circulation duct (600) gradually decreases along its airflow direction within a certain length.

7. The dust collector system according to claim 5 or 6, characterized in that, The hot air circulation duct (600) includes several branches, each of which is equipped with the regulating valve (700). The sealed cavity (20) is divided into several compartments (22). Each branch is connected to the corresponding compartment (22). The regulating valve (700) provided on each branch can be opened and closed independently.

8. The dust collector system according to any one of claims 4-6, characterized in that, The hot air circulation duct (600) is covered with a first insulation layer.

9. The dust collector system according to any one of claims 4-6, characterized in that, The upper housing (300) of the dust collector and the dust collection housing (100) are covered with a second insulation layer (102).

10. The dust collector system according to any one of claims 4-6, characterized in that, The dust collector system also includes a booster fan, which is connected to the hot air circulation duct (600).

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