Device and method for achieving sealing through air pressure difference

Abstract

The invention relates to the field of mechanical sealing, in particular to a device and method for achieving sealing through air pressure difference, the device comprises a shell, a fixed ring, a supporting piece, a movable piece, a sealing piece and an airflow generator, the shell is provided with a containing cavity, the fixed ring and the supporting piece are both fixedly connected to the inner wall of the containing cavity, one end of the movable piece is fixedly connected to the supporting piece, and the other end of the movable piece is fixedly connected to the airflow generator. The outer wall of the other end of the movable part is fixedly connected with a skirt edge, a fixing groove is formed in the inner wall of the fixing ring, the sealing part is embedded in the fixing groove, the end, facing the supporting part, of the skirt edge is provided with an abutting face, the sealing part abuts against the abutting face, the fixing ring is provided with an air vent, and the air vent is formed in the side, close to the supporting part, of the sealing part and used for being communicated with outside air. The airflow generator is arranged on the side, away from the ventilation opening, of the sealing piece and fixedly connected to the inner wall of the containing cavity. The airflow generator enables air pressure on one side of the sealing piece to be smaller than atmospheric pressure, air pressure difference exists on the two sides of the sealing piece so that the sealing piece can stably abut against the abutting face, and the sealing performance of the dust collector is improved.

Description

Technical Field

[0001] The present application relates to the field of mechanical seals, and in particular to a device and method for achieving sealing using air pressure differences. Background Art

[0002] Currently, many devices require mechanical seals, and mechanical seals play a vital role in many industrial fields. Common mechanical seal types include mechanical compression, packing, and labyrinth. While these sealing methods can meet sealing requirements to a certain extent, their sealing performance may not meet expectations in certain demanding situations.

[0003] A handheld vacuum cleaner is a compact household cleaning product that is very easy to carry and use. It is mainly used to clean smaller spaces, such as inside cars, keyboards, and electrical appliances. It can also be equipped with different components to perform different cleaning tasks. The main reason why a handheld vacuum cleaner can remove dust is that its "head" is equipped with an electric exhaust fan with a fan impeller on its rotating shaft. When powered on, the exhaust fan will generate extremely strong suction and pressure at a high speed. Under the action of suction and pressure, the air is discharged at a high speed, and the air in the dust collection part at the front end of the fan continuously replenishes the air in the fan, causing an instantaneous vacuum inside the vacuum cleaner, forming a negative pressure with the external atmospheric pressure, so that dust and other debris enter the dust filter bag through the brush head, long pipe, elbow, hose, hose connector, etc. The air is purified by the filter and discharged from the tail of the body.

[0004] Because the internal negative pressure of handheld vacuum cleaners is relatively large, handheld vacuum cleaners have high requirements for sealing. When facing extreme air pressure difference environments, traditional sealing methods may cause sealing failure due to deformation, aging or wear of the sealing ring, thereby causing leakage problems. Summary of the Invention

[0005] In order to improve the sealing performance, the present application provides a device and method for achieving sealing by utilizing air pressure difference.

[0006] In a first aspect, the present application provides a device for achieving sealing by utilizing air pressure difference, which adopts the following technical solution: The cam is secured to the cam face and is adapted to engage said support member and to engage said cam face, wherein the cam face is secured to said support member and is adapted to engage said cam face.

[0007] By adopting the above technical solution, the airflow generator and the vent are arranged on both sides of the seal. The airflow generator makes the air pressure on one side of the seal lower than the atmospheric pressure. The air pressure difference on both sides of the seal makes the seal stably abut the abutting surface, thereby improving the sealing performance of the vacuum cleaner.

[0008] Preferably, the sealing member includes a sealing ring and an abutment ring, the sealing ring abuts the bottom of the fixed groove, the abutment ring is fixedly connected to the inner wall of the sealing ring, and a sealing surface is provided at the end of the abutment ring facing away from the support member, and the sealing surface is fitted against the abutment surface. The sealing member, the groove wall of the fixed groove facing away from the support member and the outer wall of the movable member together form a ventilation cavity, and the ventilation cavity is connected to the vent.

[0009] By adopting the above technical solution, the pressure of the ventilation cavity is atmospheric pressure, and the atmospheric pressure causes the abutting ring to press against the skirt, and the sealing surface and the abutting surface fit together, thereby improving the sealing performance of the vacuum cleaner.

[0010] Preferably, a socket is provided on the groove wall of the fixing groove facing away from the support member, an insert is fixedly connected to one end of the sealing ring facing the support member, the insert is embedded in the socket, and the sealing ring is provided with a avoidance port, which is connected to the vent.

[0011] By adopting the above technical solution, the insert is embedded in the socket, which facilitates the positioning and installation of the sealing ring, improves the installation efficiency of the sealing ring, aligns the avoidance port with the vent, and makes the pressure in the vent cavity equal to atmospheric pressure, thereby improving the sealing performance.

[0012] Preferably, the movable part includes a movable ring, a filter basket and a sealing ring, one end of the movable ring is fixedly connected to the support member, the outer wall of the other end of the movable ring is fixedly connected to a skirt, the inner wall of the movable ring is fixedly connected to a clamping block, the outer wall of the filter basket is coaxially provided with a sealing groove and a clamping groove, the sealing groove is provided on the side of the clamping groove away from the support member, the clamping block is embedded in the clamping groove, the sealing ring is embedded in the sealing groove, and the sealing ring abuts the inner wall of the movable ring.

[0013] By adopting the above technical solution, the movable ring is used to fix the filter basket, the filter basket is used to filter impurities, reducing the probability of impurities entering the airflow generator, the sealing ring reduces the passage of impurities through the gap between the movable ring and the filter basket, and the filter basket is clipped onto the movable ring for easy replacement, thereby extending the service life of the vacuum cleaner.

[0014] Preferably, it also includes a ring and a sealing strip, the ring is fixedly connected to the outer wall of the airflow generator, the ring is arranged on the side of the fixing ring away from the support member, the end of the ring facing the fixing ring is provided with a guide groove, the sealing strip is provided on the outer periphery of the fixing groove and the guide groove, one end of the sealing strip is fixedly connected to the ring, and the other side of the sealing strip abuts the fixing ring, and the end of the filter basket facing the airflow generator is provided with a negative pressure groove, and the negative pressure groove is connected to the guide groove.

[0015] By adopting the above technical solution, the airflow generator causes both the negative pressure groove and the guide groove to generate negative pressure, and the guide groove and the vent are respectively arranged on both sides of the seal, so that the seal is pressed against the skirt to improve the sealing performance.

[0016] Preferably, the outer wall of the shell is provided with an exhaust port, and the exhaust port is arranged on the outer periphery of the airflow generator. The outer wall of the airflow generator, the outer wall of the ring, the outer wall of the sealing strip and the shell together form an air outlet cavity. The exhaust port is connected to the air outlet cavity, and the diameter of the sealing strip increases as it approaches the fixing ring.

[0017] By adopting the above technical solution, the air pressure in the air outlet cavity is greater than the air pressure in the guide groove, so that the sealing strip is pressed against the fixing ring more tightly, thereby improving the sealing performance.

[0018] Preferably, the shell, the fixing ring, the supporting member and the movable member together form a communicating cavity, the communicating cavity is connected to the vent, and the communicating cavity is used to communicate with the outside air.

[0019] By adopting the above technical solution, the vent is connected to the communication cavity, and the communication cavity is connected to the outside air, which is convenient for communicating with the outside world and for controlling the pressure of the vent to be atmospheric pressure.

[0020] Preferably, it also includes a filter, which is arranged on a side of the movable part away from the airflow generator, and the filter is fixedly connected to the inner wall of the accommodating chamber. The support part includes a connecting ring, a supporting ring, a mounting ring and an air-tight ring. The connecting ring is fixedly connected to the inner wall of the accommodating chamber, and the supporting ring is arranged on the inner periphery of the connecting ring. One end of the support ring is fixedly connected to the filter, and the other end of the support ring is fixedly connected to the movable part. The mounting ring is fixedly connected to the outer wall of the support ring. The mounting ring is arranged in the connecting chamber, and a sealing surface is provided at the end of the mounting ring away from the fixed ring. The outer wall of the air-tight ring is fixedly connected to the connecting ring, and the inner wall of the air-tight ring abuts the sealing surface. The outer wall of the shell is provided with an air inlet, and the air inlet is arranged on the side of the support part away from the fixed ring, and the air inlet is connected to the accommodating chamber.

[0021] By adopting the above technical solution, the airflow generator generates negative pressure during operation, so that gas enters from the air inlet, is filtered by the filter, passes through the movable parts, and finally is discharged from the shell through the airflow generator. The air pressure in the connecting cavity is greater than the air pressure in the space where the filter is located. The air pressure difference on both sides of the airtight ring causes the airtight ring to press against the closed surface, thereby improving the sealing performance.

[0022] Preferably, the diameter of the sealing surface increases as it approaches the fixing ring, the inner wall of the airtight ring is provided with an airtight surface, the diameter of the airtight surface increases as it approaches the mounting ring, and the airtight surface is in contact with the sealing surface.

[0023] By adopting the above technical solution, the air pressure difference makes the airtight surface and the sealed surface press together, thereby improving the sealing performance.

[0024] In a second aspect, the present application provides a method for achieving sealing by utilizing air pressure difference, which adopts the following technical solution: A method for achieving sealing by utilizing air pressure difference, comprising: The filter, the support, the fixing ring, the movable part and the air flow generator are sequentially installed in the accommodating cavity; Control the airflow generator to work, the gas enters the containing chamber from the air inlet, is filtered by the filter and the filter basket, and is discharged from the exhaust port; The ventilation cavity is connected to the outside atmosphere, and air pressure difference is generated on both sides of the seal, airtight ring and sealing strip, and the air pressure difference is used to improve the sealing performance.

[0025] By adopting the above technical solution, the connection between each component can improve the sealing performance through the air pressure difference, reduce production costs and improve production efficiency.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The airflow generator and vent are located on both sides of the seal. The airflow generator makes the air pressure on one side of the seal lower than the atmospheric pressure. The pressure difference on both sides of the seal enables the seal to abut the abutment surface stably, improving the sealing performance of the vacuum cleaner. 2. The airflow generator generates negative pressure in both the negative pressure groove and the guide groove. The guide groove and the vent are respectively provided on both sides of the seal, so that the seal is pressed against the skirt to improve the sealing performance. 3. The air flow generator generates negative pressure when it is working, so that the gas enters from the air inlet, is filtered by the filter, passes through the movable parts, and finally is discharged from the shell through the air flow generator. The air pressure in the connecting cavity is greater than the air pressure in the space where the filter is located. The air pressure difference on both sides of the airtight ring makes the airtight ring press against the closed surface, thereby improving the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of a device that uses air pressure difference to achieve sealing.

[0028] Figure 2 It is a cross-sectional view of a device that uses air pressure differential to achieve sealing.

[0029] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0030] Figure 4 yes Figure 2 Enlarged view of point B in the middle.

[0031] Figure 5 It is a schematic diagram of the internal structure after the fixed ring, movable parts and sealing parts are cut open.

[0032] Explanation of reference numerals: 1. housing; 11. accommodating chamber; 12. air inlet; 13. exhaust port; 14. communicating chamber; 15. air outlet chamber; 2. fixing ring; 21. fixing groove; 211. socket; 22. vent; 3. support member; 31. connecting ring; 311. limiting ring; 32. supporting ring; 33. mounting ring; 331. sealing surface; 34. airtight ring; 341. limiting groove; 342. gap; 343. airtight surface; 4. movable member; 41 , movable ring; 411, skirt; 4111, tight surface; 412, clamping block; 42, filter basket; 421, sealing groove; 422, clamping groove; 423, negative pressure groove; 43, sealing ring; 5, sealing part; 51, sealing ring; 511, insert; 512, avoidance port; 52, abutment ring; 521, sealing surface; 53, ventilation cavity; 6, air flow generator; 7, filter; 8, auxiliary part; 81, collar; 811, guide groove; 82, sealing strip. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-5 This application is described in further detail.

[0034] The embodiment of the present application discloses a device for achieving sealing by utilizing air pressure difference. Figure 1 and Figure 2 A device and method for achieving sealing using air pressure difference includes a shell 1, a fixing ring 2, a support member 3, a movable member 4, a sealing member 5, an air flow generator 6, a filter 7 and an auxiliary member 8.

[0035] Reference Figure 2 The shell 1 is provided with an accommodating chamber 11, the fixed ring 2 and the support member 3 are fixedly connected to the inner wall of the accommodating chamber 11, the movable member 4 is provided on the inner periphery of the fixed ring 2, one end of the movable member 4 is fixedly connected to the support member 3, and the other end of the movable member 4 is connected to the fixed ring 2 through a sealing member 5. The airflow generator 6 and the filter 7 are respectively provided on both sides of the movable member 4, the airflow generator 6 is arranged close to the fixed ring 2, and the filter 7 is arranged close to the support member 3. The airflow generator 6 and the filter 7 are both fixedly connected to the inner wall of the accommodating chamber 11.

[0036] Reference Figure 1 and Figure 2 The outer wall of the shell 1 is provided with an air inlet 12 and an exhaust port 13. The air inlet 12 is provided on the side of the support member 3 away from the fixing ring 2, and the exhaust port 13 is provided on the side of the fixing ring 2 away from the support member 3. The air inlet 12 is provided on the outer periphery of the filter 7, and the exhaust port 13 is provided on the outer periphery of the airflow generator 6. The air inlet 12 and the exhaust port 13 are both connected to the accommodating chamber 11. The airflow generator 6 is provided as an exhaust fan. After the airflow generator 6 is started, a negative pressure is generated. The gas enters the accommodating chamber 11 from the air inlet 12, passes through the filter 7, the movable part 4, and the airflow generator 6 in sequence, and is discharged from the exhaust port 13.

[0037] Reference Figure 2 and Figure 3 The support member 3 includes a connecting ring 31, a supporting ring 32, a mounting ring 33 and an airtight ring 34. The connecting ring 31 is fixedly connected to the inner wall of the accommodating chamber 11, the supporting ring 32 is arranged on the inner circumference of the connecting ring 31, the supporting ring 32 is arranged between the filter 7 and the movable member 4, one end of the support ring 32 is fixedly connected to the filter 7, the other end of the support ring 32 is fixedly connected to the movable member 4, the mounting ring 33 is fixedly connected to the outer wall of the support ring 32, the mounting ring 33 is arranged on the side of the connecting ring 31 close to the fixing ring 2, and a sealing surface 331 is provided at the end of the mounting ring 33 facing away from the fixing ring 2. The diameter of the sealing surface 331 increases as it approaches the fixing ring 2, and the angle between the sealing surface 331 and the outer wall of the mounting ring 33 is an obtuse angle.

[0038] The outer wall of the airtight ring 34 is coaxially provided with a limiting groove 341, the inner wall of the connecting ring 31 is fixedly connected to the limiting ring 311, the limiting ring 311 is embedded in the limiting groove 341, the outer wall of the airtight ring 34 abuts the inner wall of the connecting ring 31, thereby fixing the airtight ring 34, and a gap 342 is provided between the airtight ring 34 and the support ring 32, the gap 342 is connected to the air inlet 12, and the inner wall of the airtight ring 34 is provided with an airtight surface 343, the diameter of the airtight surface 343 increases as it approaches the mounting ring 33, and the airtight surface 343 fits the sealing surface 331.

[0039] Reference Figure 2 and Figure 4 The movable part 4 includes a movable ring 41, a filter basket 42 and a sealing ring 43. One end of the movable ring 41 is fixedly connected to the support ring 32. The outer wall of the other end of the movable ring 41 is fixedly connected to the skirt 411. The inner wall of the movable ring 41 is fixedly connected to the clamping block 412. The outer wall of the filter basket 42 is coaxially provided with a sealing groove 421 and a clamping groove 422. The sealing groove 421 is provided on the side of the clamping groove 422 away from the support member 3. The clamping block 412 is embedded in the clamping groove 422. The sealing ring 43 is embedded in the sealing groove 421. The sealing ring 43 abuts the inner wall of the movable ring 41.

[0040] Reference Figure 2 and Figure 5 The inner wall of the fixing ring 2 is provided with a fixing groove 21, which extends to the end away from the support member 3 to pass through the fixing ring 2, and the groove wall of the fixing groove 21 facing away from the support member 3 is provided with a socket 211, and the sealing member 5 is embedded in the fixing groove 21. The sealing ring 5 includes a sealing ring 51 and an abutting ring 52, and the sealing ring 51 abuts the groove bottom of the fixing groove 21, and the sealing ring 51 is fixedly connected with an insert 511 at one end facing the support member 3. The insert 511 is embedded in the socket 211, and the abutting ring 52 is fixedly connected to the inner wall of the sealing ring 51, and a sealing surface 521 is provided at the end of the abutting ring 52 facing away from the support member 3, and a tight surface 4111 is provided at the end of the skirt 411 facing the support member 3, and the sealing surface 521 is fitted with the tight surface 4111. The fixing ring 2 is provided with a vent 22, which is connected to the fixing groove 21, and the sealing ring 51 is provided with an avoidance opening 512, which is connected to the vent 22.

[0041] The seal 5, the groove wall of the fixed groove 21 facing away from the support member 3, and the outer wall of the movable ring 41 together form a ventilation cavity 53, which is connected to the vent 22. The housing 1, the fixed ring 2, the connecting ring 31, and the movable ring 41 together form a communication cavity 14, which is connected to the vent 22. The mounting ring 33 is disposed within the communication cavity 14, which is used to communicate with the outside air, allowing the seal 5 and the airtight ring 34 to utilize the air pressure difference to improve the sealing performance.

[0042] Reference Figure 2 and Figure 4The auxiliary part 8 includes a collar 81 and a sealing strip 82. The collar 81 is fixedly connected to the outer wall of the airflow generator 6. The collar 81 is provided on the side of the fixing ring 2 away from the support member 3. The end of the collar 81 facing the fixing ring 2 is provided with a guide groove 811. The sealing strip 82 is provided on the outer periphery of the fixing groove 21 and the guide groove 811. One end of the sealing strip 82 is fixedly connected to the collar 81, and the other side of the sealing strip 82 abuts the fixing ring 2. The diameter of the sealing strip 82 increases as it approaches the fixing ring 2. The end of the filter basket 42 facing the airflow generator 6 is provided with a negative pressure groove 423, and the negative pressure groove 423 is connected to the guide groove 811.

[0043] Reference Figure 1 and Figure 2 The outer wall of the airflow generator 6 , the outer wall of the collar 81 , the outer wall of the sealing strip 82 and the housing 1 together form an air outlet cavity 15 , and the exhaust port 13 is connected to the air outlet cavity 15 .

[0044] The implementation principle of the device for achieving sealing by utilizing air pressure difference in an embodiment of the present application is as follows: after the air flow generator 6 is started, negative pressure is generated, and the gas enters the accommodating chamber 11 from the air inlet 12, passes through the filter 7, the movable part 4, and the air flow generator 6 in sequence, and is discharged from the exhaust port 13. The ventilation chamber 53 is connected to the outside atmosphere, and an air pressure difference is generated on both sides of the sealing member 5, the airtight ring 34, and the sealing strip 82, and the air pressure difference is utilized to improve the sealing performance.

[0045] The present application also discloses a method for achieving sealing by utilizing air pressure difference. Figure 2 , a method for achieving sealing by utilizing air pressure difference includes, The filter 7, the support member 3, the fixing ring 2, the movable member 4 and the airflow generator 6 are sequentially installed in the accommodating cavity 11; Control the airflow generator 6 to work, and the gas enters the accommodating chamber 11 from the air inlet 12, is filtered by the filter 7 and the filter basket 42, and is discharged from the exhaust port 13; The ventilation cavity 53 is connected to the outside atmosphere, and a pressure difference is generated on both sides of the sealing member 5, the airtight ring 34 and the sealing strip 82, and the pressure difference is used to improve the sealing performance.

[0046] The implementation principle of the method of using air pressure difference to achieve sealing in an embodiment of the present application is: the air pressure difference is used to improve the sealing of the connections between the components, thereby reducing production costs and improving production efficiency.

[0047] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A device for achieving sealing by utilizing air pressure difference, characterized in that: The invention comprises a shell (1), a fixed ring (2), a support member (3), a movable member (4), a sealing member (5) and an airflow generator (6), wherein the shell (1) is provided with a receiving cavity (11), the fixed ring (2) and the support member (3) are both fixedly connected to the inner wall of the receiving cavity (11), the movable member (4) is provided on the inner periphery of the fixed ring (2), one end of the movable member (4) is fixedly connected to the support member (3), the outer wall of the other end of the movable member (4) is fixedly connected to a skirt (411), the inner wall of the fixed ring (2) is provided with a fixing groove (21), the sealing member (5) is provided with a sealing member (6), and the sealing member (6) is provided with a sealing member (7) and a sealing member (8) is provided. The sealing member (5) is embedded in the fixing groove (21), and the end of the skirt (411) facing the support member (3) is provided with a pressing surface (4111), and the sealing member (5) abuts against the pressing surface (4111). The fixing ring (2) is provided with a vent (22), and the vent (22) is provided on a side of the sealing member (5) close to the support member (3). The vent (22) is used to connect with the outside air. The airflow generator (6) is provided on a side of the sealing member (5) away from the vent (22), and the airflow generator (6) is fixedly connected to the inner wall of the accommodating cavity (11).

2. The device for achieving sealing by utilizing air pressure difference according to claim 1, characterized in that: The sealing member (5) comprises a sealing ring (51) and an abutting ring (52), wherein the sealing ring (51) abuts against the bottom of the fixed groove (21), and the abutting ring (52) is fixedly connected to the inner wall of the sealing ring (51). An end of the abutting ring (52) facing away from the support member (3) is provided with a sealing surface (521), and the sealing surface (521) is in contact with the abutting surface (4111). The sealing member (5), the groove wall of the fixed groove (21) facing away from the support member (3), and the outer wall of the movable member (4) together form a ventilation cavity (53), and the ventilation cavity (53) is connected to the ventilation port (22).

3. The device for achieving sealing by utilizing air pressure difference according to claim 2, characterized in that: A socket (211) is provided on a groove wall of the fixing groove (21) facing away from the support member (3); an insert (511) is fixedly connected to one end of the sealing ring (51) facing the support member (3); the insert (511) is embedded in the socket (211); and a relief opening (512) is provided on the sealing ring (51); the relief opening (512) is connected to the vent (22).

4. The device for achieving sealing by utilizing air pressure difference according to claim 1, characterized in that: The movable member (4) comprises a movable ring (41), a filter basket (42) and a sealing ring (43); one end of the movable ring (41) is fixedly connected to the support member (3); the outer wall of the other end of the movable ring (41) is fixedly connected to a skirt (411); the inner wall of the movable ring (41) is fixedly connected to a clamping block (412); the outer wall of the filter basket (42) is coaxially provided with a sealing groove (421) and a clamping groove (422); the sealing groove (421) is provided on a side of the clamping groove (422) away from the support member (3); the clamping block (412) is embedded in the clamping groove (422); the sealing ring (43) is embedded in the sealing groove (421); and the sealing ring (43) abuts against the inner wall of the movable ring (41).

5. The device for achieving sealing by utilizing air pressure difference according to claim 4, characterized in that: The invention also includes a collar (81) and a sealing strip (82), wherein the collar (81) is fixedly connected to the outer wall of the airflow generator (6), the collar (81) is arranged on a side of the fixing ring (2) away from the support member (3), and the collar (81) is provided with a guide groove (811) at one end of the collar (81) facing the fixing ring (2), and the sealing strip (82) is provided on the outer periphery of the fixing groove (21) and the guide groove (811), one end of the sealing strip (82) is fixedly connected to the collar (81), and the other side of the sealing strip (82) abuts the fixing ring (2), and the filter basket (42) is provided with a negative pressure groove (423) at one end facing the airflow generator (6), and the negative pressure groove (423) is connected to the guide groove (811).

6. The device for achieving sealing by utilizing air pressure difference according to claim 5, characterized in that: The outer wall of the shell (1) is provided with an exhaust port (13), and the exhaust port (13) is provided on the outer periphery of the airflow generator (6). The outer wall of the airflow generator (6), the outer wall of the collar (81), the outer wall of the sealing strip (82) and the shell (1) together form an air outlet cavity (15). The exhaust port (13) is connected to the air outlet cavity (15), and the diameter of the sealing strip (82) increases as it approaches the fixing ring (2).

7. The device for achieving sealing by utilizing air pressure difference according to claim 1, characterized in that: The housing (1), the fixed ring (2), the support member (3) and the movable member (4) together form a communication cavity (14), the communication cavity (14) being connected to the vent (22), and the communication cavity (14) being used for communicating with external air.

8. The device for achieving sealing by utilizing air pressure difference according to claim 7, characterized in that: The invention also includes a filter (7), the filter (7) being arranged on a side of the movable part (4) away from the airflow generator (6), the filter (7) being fixedly connected to the inner wall of the accommodating chamber (11), the support part (3) comprising a connecting ring (31), a supporting ring (32), a mounting ring (33) and an airtight ring (34), the connecting ring (31) being fixedly connected to the inner wall of the accommodating chamber (11), the supporting ring (32) being arranged on the inner periphery of the connecting ring (31), one end of the supporting ring (32) being fixedly connected to the filter (7), and the other end of the supporting ring (32) being fixedly connected to the movable part. (4), the mounting ring (33) is fixedly connected to the outer wall of the support ring (32), the mounting ring (33) is arranged in the connecting cavity (14), the end of the mounting ring (33) away from the fixing ring (2) is provided with a sealing surface (331), the outer wall of the airtight ring (34) is fixedly connected to the connecting ring (31), the inner wall of the airtight ring (34) abuts the sealing surface (331), the outer wall of the shell (1) is provided with an air inlet (12), the air inlet (12) is arranged on the side of the support member (3) away from the fixing ring (2), and the air inlet (12) is connected to the accommodating cavity (11).

9. The device for achieving sealing by utilizing air pressure difference according to claim 8, characterized in that: The diameter of the sealing surface (331) increases as it approaches the fixing ring (2); the inner wall of the airtight ring (34) is provided with an airtight surface (343); the diameter of the airtight surface (343) increases as it approaches the mounting ring (33); and the airtight surface (343) is in contact with the sealing surface (331).

10. A method for achieving sealing by utilizing air pressure difference, used in the device for achieving sealing by utilizing air pressure difference as claimed in any one of claims 1 to 9, characterized in that: The filter (7), the support member (3), the fixing ring (2), the movable member (4) and the airflow generator (6) are sequentially installed in the accommodating chamber (11); The air flow generator (6) is controlled to operate, and the gas enters the accommodating chamber (11) from the air inlet (12), is filtered by the filter (7) and the filter basket (42), and is discharged from the exhaust port (13); The vent cavity (53) is in communication with the outside atmosphere, and a pressure difference is generated on both sides of the sealing member (5), the airtight ring (34) and the sealing strip (82), thereby improving the sealing performance.

Images