A high-temperature air filter

By using PI sealing cotton and a pressure plate structure with heat dissipation holes, the problem of high-temperature air filter seals falling off is solved, and stable sealing and filtering effects are achieved at high temperatures, ensuring air cleanliness and equipment life.

CN116440615BActive Publication Date: 2025-09-16HANGZHOU COBETTER FILTRATION EQUIPMENT CO LTD
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Patent Information

Application Number
CN202310618650.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-05-27
Publication Date
2025-09-16
Estimated Expiration
2043-05-27

AI Technical Summary

Technical Problem

Existing high-temperature air filters are prone to seal chipping in high-temperature environments, resulting in poor sealing performance, reduced filtration efficiency, and inability to be used stably for a long time.

Method used

PI sealing cotton is used as the seal, with a softness of 20-200mN, an air permeability of 150-600L/m2/s, and a thermal decomposition temperature greater than 400°C. Combined with a pressure plate with heat dissipation holes and PI filter cotton, a porous structure is formed to ensure sealing performance and heat dissipation effect.

Benefits of technology

Maintain effective sealing and filtering effects for a long time in high temperature environments, avoid debris falling, ensure high cleanliness of filtered air, and extend service life.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention discloses a high-temperature air filter, comprising: a frame, which defines a gas channel extending in a first direction through two side plates and two end plates; a filter membrane, which is arranged in the gas channel and folded to form pleats; a spacer, which is arranged between adjacent pleats of the filter membrane to maintain the pleat spacing; a first sealing member, which is arranged between the end face of the filter membrane and the end plate; a second sealing member, which is arranged in an interference fit between the side face of the filter membrane and the side plate; the first and / or second sealing member is made of PI sealing cotton, which is a porous material and has an air permeability of 150-600 L / m at a pressure difference of 200 Pa. 2 / s, softness is 20-200mN, and thermal decomposition temperature is greater than 400℃; the first and / or second sealing PI sealing cotton is made of porous material. Under the premise of ensuring sealing performance, the multiple air holes on the PI sealing cotton are used to transfer the heat of the PI sealing cotton to the outside, thereby extending the service life under high temperature; the PI sealing cotton can undergo appropriate deformation to ensure long-term effective sealing and filtering effects without debris falling, and the air cleanliness after filtration is high.
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Claims

1. A high-temperature air filter, comprising: a frame defining a gas passage extending in a first direction through two side plates and two end plates; a filter membrane, disposed in the gas channel and folded to form pleats; Spacers are provided between adjacent pleats of the filter membrane to maintain the pleat spacing; a first sealing member, disposed between the filter membrane end surface and the end plate; The second sealing member is interference-fitted between the side surface of the filter membrane and the side plate; and is characterized in that: The first sealing member and / or the second sealing member are made of PI sealing cotton, which is a porous material with an air permeability of 150-600 L / m under a pressure difference of 200 Pa. 2 / s, its softness is 20-200mN, and its thermal decomposition temperature is greater than 400℃.

2. The high-temperature air filter according to claim 1, characterized in that: A pressure plate for supporting the first sealing member is provided between the filter membrane and the end plate, and the pressure plate is provided with heat dissipation holes.

3. The high-temperature air filter according to claim 2, characterized in that: The first sealing member is axially wound around the pressure plate with a first direction being the axial direction.

4. The high-temperature air filter according to claim 1, characterized in that: The PMI average pore size of the PI sealing cotton is 5-10um; the porosity of the PI sealing cotton is not less than 60%; and the thickness of the PI sealing cotton is 1-8mm.

5. The high-temperature air filter according to claim 1, characterized in that: The PI sealing cotton includes fibers for forming a porous structure, and there is a bonding area of ​​a certain area between adjacent fibers; the SEM average diameter of the fibers is 0.4-1.5 μm, and the SEM average area of ​​the bonding area is 0.6-2 μm 2 .

6. The high-temperature air filter according to claim 1, characterized in that: The PI sealing cotton has a gram weight of 5-15g / m 2 The weight average molecular weight of the PI material in the PI sealing cotton is 20,000-35,000, and the molecular weight distribution is 1.5-3.

7. The high-temperature air filter according to claim 1, characterized in that: The longitudinal dimension of the spacer is smaller than that of the filter membrane, so as to form a cavity between the first seal, the spacer and the filter membrane. A PI filter cotton is arranged in the cavity. The PI filter cotton is a porous material and abuts against the first seal to block the gap between the filter membrane and the first seal. The air permeability of the PI filter cotton is 100-800 L / m at a pressure difference of 200 Pa. 2 / s, and its softness is 10-300mN.

8. The high-temperature air filter according to claim 1, characterized in that: The frame is provided with first baffles respectively upstream and downstream of the gas channel, and the first baffles and the two side plates are arranged to form a first installation space; the projection surface of the first baffle in the first direction covers the first seal and the PI filter cotton.

9. The high-temperature air filter according to claim 1, characterized in that: The frame is provided with second baffles respectively upstream and downstream of the gas channel. The second baffles and the two end plates are arranged to form a second installation space. The projection surface of the second baffles in the first direction covers the second sealing member.

10. The high-temperature air filter according to claim 7, characterized in that: The PMI average pore size of the PI filter cotton is 3-15 μm; the porosity of the PI filter cotton is not less than 50%; and the thickness of the PI filter cotton is 1-8 mm.

11. The high-temperature air filter according to claim 7, characterized in that: The PI filter cotton includes closed sections corresponding to the pleat peaks and pleat valleys and extended sections integrally connected to both sides of the closed sections; the extended sections of adjacent filter cottons have overlapping parts in the lateral projection surface; the longitudinal dimension of the PI filter cotton in its natural state is larger than the longitudinal dimension of the cavity.

12. The high-temperature air filter according to claim 2, characterized in that: The pressing plate is made of a hard material; the diameter of the heat dissipation holes on the pressing plate is 1-10 mm, and the spacing between adjacent heat dissipation holes is 5-80 mm.

13. The high-temperature air filter according to claim 2, characterized in that: The thickness of the pressing plate is 0.5-10 mm, the total area of ​​the heat dissipation holes is S1, the area of ​​the pressing plate is S2, and S1 / S2 is 5-30%.

14. The high-temperature air filter according to claim 2, characterized in that: The heat dissipation holes include a first heat dissipation hole with a diameter of 5-10 mm and a second heat dissipation hole with a diameter of 1-5 mm. The diameter of the first heat dissipation hole is larger than the diameter of the second heat dissipation hole. The second heat dissipation hole is arranged on the outer circle of the pressure plate to surround the first heat dissipation hole inside, and the distance between the edge of the second heat dissipation hole and the edge of the pressure plate is 15-35 mm.

15. The high-temperature air filter according to claim 1, characterized in that: The filter membrane has a thickness of 0.1-3 mm, a stiffness of 800-1600 mg, a tensile strength of 0.2-5.0 kN / m, and an elongation greater than 0.55%.

Citation Information

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