A bag filter gas drawing valve sealing device

Abstract

The utility model discloses a cloth bag dust collector gas lift valve sealing device, the utility model relates to dust collector gas lift valve sealing technical field, including air cylinder, gas lift valve box, sealing valve plate subassembly and dust collector. Air cylinder is fixed in the gas lift valve box top surface, and its telescopic end is connected with sealing valve plate subassembly through joint cover, and sealing valve plate subassembly includes joint seat, guide post, upper steel sheet and lower steel sheet, and sets up pressure spring between joint cover and joint seat, and lower steel sheet circumference is equipped with rubber seal ring. The structure forms "elastic soft seal + sucking disc type pressure compensation" system, can fill in the air flange surface microdefect and compensates installation deviation, reduces the air leakage rate to below 1%, significantly reduces dust escape. The device has the characteristics of anti-vibration, high temperature resistance, reliable sealing, structure can be dismantled and changes etc.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology for the air lifting valve of a dust collector, specifically a sealing device for the air lifting valve of a bag dust collector. Background Technology

[0002] As a core control component for the airflow control in a dust collector system, the air intake valve's core function is to precisely open and close the air inlet by driving a circular steel plate with a cylinder. Traditional air intake valves use a "hard seal" structure, where the circular steel plate directly contacts the inlet flange, relying on cylinder pressure (0.4~0.6MPa) for sealing. However, this structure has the following technical drawbacks: 1. Poor sealing reliability: Flange surface roughness (Ra≥12.5μm) and installation deviations (flatness error≥0.5mm / m) lead to contact gaps, resulting in a leakage rate of 5%~10% and an increase in dust escape of 20%~30%. 2. Weak vibration resistance: Industrial environmental vibrations (such as fan start-up and shutdown, pipeline resonance) can easily cause the steel plate to shift, leading to instantaneous sealing failure and sudden dust leakage. 3. Insufficient temperature adaptability: Under high-temperature conditions (such as above 150℃), the steel plate undergoes thermal deformation, widening the gap, and the leakage rate increases exponentially with increasing temperature.

[0003] In summary, to address the issue that traditional air lifting valves rely on direct contact between the steel plate and the air inlet for sealing, which is susceptible to factors such as installation accuracy, surface roughness, and equipment vibration, leading to inadequate sealing, a sealing device for the air lifting valve of a baghouse dust collector is proposed. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the existing defects and provide a sealing device for the air lifting valve of a bag dust collector. Through the structural design of combining elastic soft sealing with pressure compensation, it achieves comprehensive optimization of high-efficiency sealing, vibration resistance, high temperature resistance and easy maintenance, significantly reduces air leakage rate, reduces dust escape and extends equipment service life, and can effectively solve the problems in the background technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a sealing device for a baghouse dust collector's lifting valve, comprising a cylinder, a lifting valve housing, a sealing valve plate assembly, and a dust collector. The cylinder is fixed to the top surface of the lifting valve housing, and the telescopic end of the cylinder passes through the lifting valve housing and is connected to the sealing valve plate assembly. The sealing valve plate assembly includes a connector sleeve, a connector seat, an upper steel plate, and a lower steel plate. The center of the connector seat is located at a guide post, and the connector seat is inserted into the connector sleeve through the guide post. The connector sleeve is connected to the telescopic shaft of the cylinder's telescopic end. The connector seat and connector sleeve are connected by an insertion method, which not only serves as a guide but also provides reliable elastic support space for the elastic soft seal of the lower steel plate. A pressure spring is provided between the connector sleeve and the connector seat, which provides elastic pressure to the lower steel plate to prevent sealing failure. A rubber sealing ring is provided around the circumference of the lower steel plate. Through the addition of the rubber sealing ring, "elastic soft seal +" is achieved. The "suction cup pressure compensation" function constructs a new sealing system that makes tight contact with the air inlet flange. Relying on the high elasticity of the rubber, it fills the microscopic defects on the surface of the air inlet flange. When the roughness Ra ≤ 6.3 μm, it can achieve a complete seal. Simultaneously, it compensates for installation deviations through deformation, remaining effective even when the flatness error is ≤ 0.3 mm / m. This rubber sealing ring adheres tightly to the air inlet flange like a suction cup, reducing the air leakage rate from the conventional 5%-10% to below 1%, significantly reducing dust escape and ensuring the dust collector's dust removal efficiency. The improved sealing performance reduces wear on internal components caused by air and dust leakage, especially filter bag wear, lowering maintenance frequency and costs, and improving equipment operating efficiency. The air lifting valve housing is located on the dust collector's housing, with the rubber sealing ring on the lower steel plate corresponding to the air inlet flange inside the dust collector.

[0006] Furthermore, the telescopic shaft of the cylinder passes through the connector sleeve, and the telescopic shaft of the cylinder and the connector sleeve are connected by a pin. This movable connection method using a pin facilitates disassembly and maintenance, and improves the practicality of the device.

[0007] Furthermore, the lower steel plate and the upper steel plate are connected and fixed by bolt one. A support plate is provided on the lower surface of the lower steel plate. The support plate, the lower steel plate, the upper steel plate and the connector seat are fixed together by bolt two. This combination of bolts is convenient for replacing different parts. When one part is damaged, it can be easily replaced.

[0008] Furthermore, the rubber sealing ring has an annular protrusion on its inner circumference. During sealing, the annular protrusion first contacts the air inlet flange, increasing the contact force with the air inlet flange and providing sealing reliability. Under pressure, the rubber sealing ring also deforms, filling the tiny gap between the lower steel plate and the air inlet flange, forming a tight fit and ensuring the sealing effect.

[0009] Furthermore, the rubber sealing ring is fixed to the circumferential surface of the lower steel plate by adhesive or vulcanization to ensure the stability of the sealing ring under long-term vibration and high-temperature conditions, and to facilitate replacement after wear.

[0010] Baghouse dust collectors rely on the reduction of airflow velocity after dust-laden gas enters the collector, causing large dust particles to settle into the ash hopper due to gravity; the remaining dust enters the bag area with the airflow and is intercepted by the bags, while the purified gas is discharged through the valve orifice of the air lifting valve; when the dust collector's pulse valve is cleaning, the cylinder receives a signal to close the air lifting valve to create an isolated space, preventing secondary dust generation when the pulse valve is working, which would result in low dust removal efficiency.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This utility model forms a new sealing system of "elastic soft seal + suction cup pressure compensation" by setting a rubber sealing ring around the circumference of the lower steel plate and configuring a pressure spring between the joint sleeve and the joint seat. The system uses the high elasticity of rubber to fill the micro-defects on the surface of the air inlet flange. When the flange roughness Ra≤6.3μm, it can achieve complete sealing. At the same time, it compensates for installation deviations through the deformation capacity of rubber.

[0013] 2. The sealing valve plate assembly of this utility model adopts a joint sleeve and a joint seat for plug-in connection, and is precisely guided by a guide post, which effectively improves the sealing stability during operation. In industrial operating environments, vibration factors such as fan start-up and shutdown and pipeline resonance can easily cause the sealing surface of traditional hard-seal steel plates to fail instantly. However, the plug-in guide design of this structure can prevent the valve plate from shifting under vibration, significantly enhancing its vibration resistance. At the same time, the inner circumference of the rubber sealing ring is provided with annular protrusions, which preferentially contact the air inlet flange during the sealing process, improving the contact pressure and sealing stability. Under the action of working pressure, it generates secondary deformation, further filling the tiny gap between the lower steel plate and the air inlet flange, ensuring the continuity of the sealing effect under vibration conditions.

[0014] 3. The cylinder telescopic shaft and the connector sleeve of this utility model are detachably connected by pins, and the lower steel plate, upper steel plate, support plate and connector seat are fixed by bolts, which makes the device highly interchangeable and easy to maintain. When any part is damaged, it can be replaced individually without scrapping the whole, which significantly reduces the equipment maintenance cost. The improved sealing performance also effectively reduces the wear of internal components such as filter bags caused by air and dust leakage, and extends the service life of filter bags and dust collectors, thereby improving the overall operating efficiency and long-term economy of the equipment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the opening structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the sealing valve plate assembly structure of this utility model;

[0017] Figure 3 This is an enlarged structural diagram of point A in this utility model;

[0018] Figure 4 This is a schematic diagram of the closed structure of this utility model;

[0019] Figure 5 This is a schematic diagram of the gas flow structure of the dust collector of this utility model.

[0020] In the diagram: 1. Cylinder, 2. Air lifting valve box, 3. Sealing valve plate assembly, 4. Air inlet flange, 5. Pressure spring, 6. Bolt 1, 7. Upper steel plate, 8. Lower steel plate, 9. Support plate, 10. Connector seat, 11. Guide column, 12. Pin, 13. Connector sleeve, 14. Rubber sealing ring, 15. Dust collector, 16. Bolt 2, 17. Annular protrusion. Detailed Implementation

[0021] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Example 1

[0022] Please see Figure 1-5This utility model provides a technical solution: a sealing device for the air lifting valve of a baghouse dust collector, wherein a cylinder 1 is fixed on the top surface of the air lifting valve housing 2, and the telescopic end of the cylinder 1 passes through the air lifting valve housing 2 and is connected to the sealing valve plate assembly 3; the sealing valve plate assembly 3 includes a connector sleeve 13, a connector seat 10, an upper steel plate 7, and a lower steel plate 8, wherein a guide post 11 is provided at the center of the connector seat 10, and the connector seat 10 is inserted into the connector sleeve 13 through the guide post 11, and the connector sleeve 13 is connected to the telescopic shaft of the telescopic end of the cylinder 1; the connector seat 10 and the connector sleeve 13 are connected by a plug-in method, which not only serves as a guide but also provides elastic support space for the elastic soft seal of the lower steel plate 8; a pressure spring 5 is provided between the connector sleeve 13 and the connector seat 10 to provide elastic pressure to the lower steel plate 8 and prevent sealing failure; the lower steel plate A rubber sealing ring 14 is provided around the circumference of the dust collector 15. It uses an "elastic soft seal + suction cup pressure compensation" structure to contact the air inlet flange 4. The high elasticity of the rubber fills the micro-defects on the surface of the air inlet flange 4. When the roughness Ra≤6.3μm, a complete seal can be achieved. Deformation can compensate for installation deviations. When the flatness error is ≤0.3mm / m, it can still effectively seal. Under the adsorption effect, the rubber sealing ring 14 reduces the air leakage rate from 5%~10% to less than 1%, reduces dust escape, improves the dust removal efficiency of the dust collector 15, and reduces the wear of components and filter bag caused by air leakage and dust leakage, thereby reducing maintenance costs and improving operating efficiency. The air lifting valve box 2 is set on the dust collector 15 box, and the rubber sealing ring 14 on the lower steel plate 8 corresponds to the air inlet flange 4 inside the dust collector 15.

[0023] The working principle of this implementation is as follows: the cylinder 1 drives the sealing valve plate assembly 3 to move precisely along the guide column 11, so that the lower steel plate 8 and its outer rubber sealing ring 14 are in close contact with the air inlet flange 4; under the action of the pressure spring 5, the rubber sealing ring 14 is pressed evenly against the flange surface, and its elasticity fills the micro-protrusions to achieve a soft seal; the suction effect of the rubber ring can form a stable negative pressure adhesion on the sealing surface, improving the vibration resistance and offset resistance; even if there is fan start-up and shutdown, pipeline resonance or high temperature expansion, the sealing surface can still maintain the fit through rubber deformation to prevent air leakage; the plug-in guide fit ensures the stable positioning of the sealing valve plate assembly during the movement, thereby ensuring the sealing effect under long-term operation.

[0024] The beneficial effects of this implementation are: significantly improved sealing performance and adaptability, reduced air leakage rate to below 1%, reduced dust escape, and improved dust removal efficiency; the guide column 11 and the plug-in structure enhance vibration resistance, and can maintain stable sealing even with installation deviations or rough flange surfaces; the soft sealing structure avoids failure caused by thermal deformation of steel plates at high temperatures, and extends the life of filter bags and components; the replaceable component design reduces maintenance costs and improves long-term economic efficiency.

[0025] Replaceable or modified implementations include: the pressure spring 5 can be replaced with a wave spring or a disc spring; the rubber sealing ring 14 can be made of fluororubber, silicone rubber or high-temperature resistant nitrile rubber; the connector sleeve 13 and the connector seat 10 can be connected by a quick-release snap-fit; the lower steel plate 8 can be adjusted in size to match different models of dust collectors; the sealing ring 14 can be coated with polytetrafluoroethylene to improve corrosion resistance; the installation position can be adjusted according to the structure of the dust collector to ensure the best sealing effect.

[0026] In another possible implementation, the telescopic shaft of cylinder 1 passes through the connector sleeve 13, and the telescopic shaft of cylinder 1 and connector sleeve 13 are connected by a pin 12, using a pin-locking connection method for easy disassembly and maintenance. Its working principle is as follows: when the telescopic shaft of cylinder 1 is working, it drives connector sleeve 13 and sealing valve plate assembly 3 to move along the guide direction. The pin 12 achieves a detachable mechanical connection, ensuring transmission reliability and allowing for quick separation of the cylinder and sealing assembly during maintenance. This structure reduces downtime, lowers maintenance time and labor costs, while maintaining transmission rigidity and stability. Alternative methods include: the pin 12 can be a cylindrical pin, cotter pin, or elastic pin, and the material can be stainless steel or high-strength alloy; the connection method can be replaced with quick-release clips, threaded connections, etc.; in high-frequency disassembly and assembly scenarios, an anti-loosening locking plate structure can be added to prevent loosening during operation.

[0027] In another possible implementation, the lower steel plate 8 and the upper steel plate 7 are connected and fixed by bolt 6. The lower surface of the lower steel plate 8 is provided with a support plate 9. The support plate 9, the lower steel plate 8, the upper steel plate 7, and the connector seat 10 are fixed by bolt 16. The working principle is as follows: bolt 6 fixes the lower steel plate 8 and the upper steel plate 7, and bolt 16 connects the support plate 9, the lower steel plate 8, the upper steel plate 7, and the connector seat 10 into a whole. This ensures the rigidity of the sealing valve plate assembly and allows for quick disassembly of the corresponding bolts for individual replacement when parts need to be replaced. Its beneficial effects are improved component interchangeability, reduced maintenance costs, and maintenance of overall structural strength. Replaceable options include: bolts can be replaced with high-strength screws or double-ended studs; anti-loosening washers or thread-locking adhesive can be added under conditions of strong vibration; the support plate 9 can be made of aluminum alloy or stainless steel to reduce weight or enhance corrosion resistance.

[0028] In another possible implementation, the rubber sealing ring 14 has an annular protrusion 17 on its inner circumference. During sealing, the annular protrusion 17 first contacts the air inlet flange 4, increasing the contact force and improving the sealing reliability. The rubber sealing ring 14 deforms under pressure, filling the tiny gap between the lower steel plate 8 and the air inlet flange 4, forming a tight fit. Its working principle is as follows: the annular protrusion 17 acts as a pilot sealing surface, preferentially contacting the air inlet flange 4, initially forming a higher local contact pressure. Subsequently, the rubber sealing ring 14 is deformed under pressure to form a full circumferential seal. Its beneficial effect is to improve the initial sealing speed and reliability, ensuring a good seal even when the flange surface is rough or has slight deformation. Alternative methods include: the cross-sectional shape of the annular protrusion 17 can be semi-circular, trapezoidal, or pointed; the sealing ring 14 can adopt a double protrusion or multi-layer structure; under high-temperature conditions, a heat-resistant coating can be applied to the surface of the protrusion to extend its service life.

[0029] In another possible implementation, the rubber sealing ring 14 is fixed to the circumferential surface of the lower steel plate 8 by adhesive bonding or vulcanization to ensure stability under long-term vibration and high-temperature conditions, and to facilitate replacement. Its working principle is as follows: the rubber sealing ring 14 is firmly fixed to the outer circumference of the lower steel plate 8 by adhesive bonding or vulcanization, allowing it to withstand frequent vibration and high-temperature thermal stress during operation, preventing detachment or displacement. When the sealing ring 14 wears to its limit, it can be replaced by heating and peeling or mechanical cutting. Its advantages include reducing the risk of air leakage caused by loose sealing rings, improving bonding strength and heat resistance, and facilitating maintenance and replacement. Replacement methods include: the sealing ring 14 can be fixed by mechanical slots for glue-free replacement; the adhesive can be high-temperature resistant epoxy, silicone, or polyurethane; in corrosive environments, a sealing ring with an embedded metal skeleton can be used to improve strength.

[0030] The foregoing has shown and described the basic principles, main features and advantages of this utility model. Various changes and modifications may be made to this utility model without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of this utility model as claimed.

Claims

1. A sealing device for a lifting valve of a baghouse dust collector, comprising a cylinder (1), a lifting valve housing (2), a sealing valve plate assembly (3), and a dust collector (15), characterized in that: The cylinder (1) is fixed on the top surface of the air lifting valve box (2). The telescopic end of the cylinder (1) passes through the air lifting valve box (2) and is connected to the sealing valve plate assembly (3). The sealing valve plate assembly (3) includes a connector sleeve (13), a connector seat (10), an upper steel plate (7), and a lower steel plate (8). The center of the connector seat (10) is set in the guide post (11). The connector seat (10) is inserted into the connector sleeve (13) through the guide post (11). The connector sleeve (13) is connected to the telescopic shaft of the telescopic end of the cylinder (1). A pressure spring (5) is provided between the connector sleeve (13) and the connector seat (10). A rubber sealing ring (14) is provided on the circumference of the lower steel plate (8). The air lifting valve box (2) is set on the box of the dust collector (15). The rubber sealing ring (14) on the lower steel plate (8) corresponds to the air inlet flange (4) inside the dust collector (15).

2. The sealing device for the air lifting valve of a baghouse dust collector according to claim 1, characterized in that: The telescopic shaft of the cylinder (1) passes through the connector sleeve (13), and the telescopic shaft of the cylinder (1) and the connector sleeve (13) are connected by a pin (12).

3. The sealing device for the air lifting valve of a baghouse dust collector according to claim 1, characterized in that: The lower steel plate (8) and the upper steel plate (7) are connected and fixed by bolt one (6). A support plate (9) is provided on the lower surface of the lower steel plate (8). The support plate (9), the lower steel plate (8), the upper steel plate (7) and the connector seat (10) are fixed by bolt two (16).

4. The sealing device for the air lifting valve of a baghouse dust collector according to claim 1, characterized in that: The rubber sealing ring (14) has an annular protrusion (17) in the inner circumferential direction.

5. The sealing device for the air lifting valve of a baghouse dust collector according to claim 1, characterized in that: The rubber sealing ring (14) is fixed to the circumferential surface of the lower steel plate (8) by pasting or vulcanization.

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