Sealing structure and sealing method based on deformation of flexible sealing element

Abstract

The invention relates to the technical field of sealing, in particular to a sealing structure and a sealing method based on deformation of a flexible sealing element, and the sealing structure comprises a driving part, a transmission part, a transmission rod and a sealing container; the driving part is located outside the sealed container, and the transmission part is located inside the sealed container; the driving part and the transmission part are connected through a transmission rod; an elastic sealing connecting part is arranged on the sealing container between the driving part and the transmission part; and a transmission rod penetrates through the elastic sealing connecting part and is in sealing connection with the sealing container through the elastic sealing connecting part. The areas, making contact with the transmission rod, of the elastic sealing connecting part change along with the shape, and the pressure borne by the areas by the elastic sealing connecting part is not changed, so that static sealing of the elastic sealing connecting part on the transmission rod is achieved, and meanwhile the uniform sealing effect of the areas of the elastic sealing connecting part is guaranteed; and the technical problems of non-uniform compression, non-uniform abrasion and reduced sealing effect in long-term use existing in dynamic sealing are solved.

Description

Technical Field

[0001] The present invention relates to the field of sealing technology, and in particular to a sealing structure and a sealing method based on deformation of a flexible sealing element. Background Art

[0002] Dynamic seals are a common sealing form and are widely used in various types of equipment. The compression seal of elastic sealing materials is one of the most commonly used and simplest connection methods in pressure vessels and pipelines, and has the advantage of being easy to disassemble and repair. However, dynamic seals often have problems such as insufficient positioning accuracy, uneven compression, and uneven wear, which result in the sealing contact surface being unable to effectively perform its sealing function: although sealing materials generally have a certain degree of elasticity and can compensate for minor wear or structural deviations through deformation, when the wear between the sealing contact surfaces is large, the sealing effect will be reduced or fail, and the seal will easily leak and fail.

[0003] In addition, when dynamic seals are used to connect large equipment structures, the position deviation of the two parts of the dynamic seal connection is difficult to adjust in a simple way due to the large size of the equipment or the existence of the foundation. The position deviation will cause local wear of the elastic sealing element of the dynamic seal and even cause seal failure.

[0004] Therefore, the prior art requires a dynamic sealing structure with uniform sealing loss and good long-term sealing performance to solve the problem of sealing failure due to friction and wear under actual use conditions. Summary of the invention

[0005] In view of the above analysis, the present invention aims to provide a sealing structure and a sealing method based on the deformation of a flexible sealing element, so as to solve at least one of the technical problems existing in the prior art of dynamic sealing, such as uneven compression, uneven wear and decreased sealing effect after long-term use.

[0006] The purpose of the present invention is mainly achieved through the following technical solutions:

[0007] The present invention provides a sealing structure based on deformation of a flexible sealing element, the sealing structure comprising: an active part, a transmission part, a transmission rod and a sealing container;

[0008] The active part is located outside the sealed container, and the transmission part is located inside the sealed container;

[0009] The active part and the transmission part are connected by a transmission rod;

[0010] An elastic sealing connection part is provided on the sealing container between the active part and the transmission part;

[0011] The transmission rod passes through the elastic sealing connection portion and is sealedly connected to the sealing container through the elastic sealing connection portion;

[0012] When the transmission rod moves with the active part, each area where the elastic sealing connection part contacts the transmission rod changes with the shape and the pressure exerted by the elastic sealing connection part on each area remains unchanged.

[0013] Preferably, a through hole is provided in the central area of ​​the elastic sealing connection portion;

[0014] The outside of the through hole is an annular sealing area with adjustable pressure;

[0015] The outer side of the pressure-adjustable annular sealing area is sealed and fixedly connected to the sealed container.

[0016] Preferably, the cross section of the elastic sealing connection portion is circular, and the cross section diameter of the elastic sealing connection portion changes gradually from large to small and then from small to large from the side of the sealed container to the outside of the sealed container.

[0017] Preferably, the ratio of the diameter of the through hole to the minimum cross-sectional diameter of the elastic sealing connection portion satisfies: 1:5-20.

[0018] Preferably, the pressure-adjustable annular sealing area is a cavity structure filled with fluid, and the contact and elastic sealing between the elastic sealing connection part and the transmission rod are achieved by filling with liquid or gas.

[0019] Preferably, the performance index range of the surface material of the elastic sealing structure meets the following requirements: tensile strength ≥ 3MPa; elongation at break ≥ 200%.

[0020] Preferably, the active part, the transmission part and the transmission rod are hingedly connected via three degrees of freedom.

[0021] Preferably, two three-degree-of-freedom hinges are provided, wherein one of the three-degree-of-freedom hinges is simultaneously connected to one end of the transmission rod and the active part, and the other three-degree-of-freedom hinge is simultaneously connected to the other end of the transmission rod and the transmission part.

[0022] Preferably, the center distance of the three-degree-of-freedom hinge relative to the active part and the center distance relative to the transmission part are adjustable.

[0023] A sealing method based on deformation of a flexible sealing element uses the above-mentioned sealing structure based on deformation of a flexible sealing element.

[0024] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0025] (1) The present invention realizes static sealing of the transmission rod by the elastic sealing connection part by arranging each area where the elastic sealing connection part contacts the transmission rod to change with the shape and each area is subjected to a constant pressure by the elastic sealing connection part, thereby ensuring a uniform sealing effect of each area where the elastic sealing connection part contacts the transmission rod, thereby solving the technical problems of uneven compression, uneven wear and reduced sealing effect after long-term use existing in dynamic seals in the prior art.

[0026] (2) In the present invention, the active part, the transmission part and the transmission rod are connected by a three-degree-of-freedom hinge, so that when the active part transmits rotation to the transmission part, the transmission rod rotates in the opposite direction relative to the inner surface of the through hole relative to the rotation direction of the active part, and the sliding friction of the transmission rod relative to the inner surface of the through hole can be converted into rolling friction, which greatly reduces the friction force, thereby greatly reducing the friction loss of the elastic sealing connection and improving the service life; at the same time, it avoids the transmission rod driving the movement of the inner surface of the through hole to cause wrinkles on the surface material of the elastic sealing structure, thereby improving the sealing effect; at the same time, since the transmission rod rotates in the opposite direction relative to the elastic sealing connection, the loss in all directions is uniform, and it is not easy to produce sealing defects, thereby overcoming the problem of uneven sealing loss in the prior art.

[0027] (3) The present invention realizes the adjustment of the linear speed of the transmission part under the same angular velocity of the active part by setting the center distance of the three-degree-of-freedom hinge relative to the active part and the transmission part to be adjustable, thereby conveniently realizing the speed change of the transmission part.

[0028] (4) The present invention improves the service life and long-term sealing effect of the sealing structure by connecting the active part, the transmission part and the transmission rod through a three-degree-of-freedom hinge, the ratio of the diameter of the through hole to the minimum cross-sectional diameter of the elastic sealing connection part satisfies 1:5 to 20, and the tensile elongation of the surface material of the elastic sealing structure is ≥200%.

[0029] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the embodiments of the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0031] Figure 1 A schematic structural diagram showing a sealing structure in one embodiment of the present invention;

[0032] Figure 2a express Figure 1A partial cross-sectional view of the elastic sealing connection area;

[0033] Figure 2b express Figure 2a Partial cross-sectional view after the middle transmission rod is rotated 90°;

[0034] Figure 2c express Figure 2b A partial cross-sectional view of the middle transmission rod after rotating 180°;

[0035] Figure 3 A schematic diagram showing how sealing is achieved in a through hole when a transmission rod rotates in one embodiment of the present invention.

[0036] Reference numerals:

[0037] Active part 01, transmission part 02;

[0038] Elastic sealing connection part 03, through hole 031, pressure-adjustable annular sealing area 032;

[0039] Transmission rod 04, sealed container 05. DETAILED DESCRIPTION

[0040] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0041] On the one hand, the present invention discloses a wear-free sealing structure based on a flexible sealing element, such as Figure 1-2c As shown, it includes: an active part 01, a transmission part 02, a transmission rod 04 and a sealed container 05; the active part 01 is located outside the sealed container 05, and the transmission part 02 is located inside the sealed container 05;

[0042] The active part 01 and the transmission part 02 are connected by a transmission rod 04;

[0043] An elastic sealing connection part 03 is provided on the sealed container between the active part 01 and the transmission part 02; the transmission rod 04 passes through the elastic sealing connection part 03 and is sealedly connected with the sealed container 05 through the elastic sealing connection part 03;

[0044] When the transmission rod 04 moves with the active part 01 , each area where the elastic sealing connection part 03 contacts the transmission rod 04 changes in shape and the pressure exerted by the elastic sealing connection part on each area remains unchanged.

[0045] During implementation, as the transmission rod 04 moves with the active part 01, the areas where the elastic sealing connection part 03 contacts the transmission rod 04 change accordingly. Since the transmission rod 04 moves in a circular motion, the sealing structure can achieve close contact between the elastic sealing connection part and the transmission rod without relative sliding through its own elastic deformation, thereby replacing the dynamic seal with a static seal and effectively avoiding the elastic wear of the sealing element. At the same time, the pressure of the elastic sealing connection part on the outer surface of the transmission rod remains unchanged, ensuring a uniform sealing effect on the areas where the elastic sealing connection part connects to the transmission rod.

[0046] As an example, Figure 2a-2c Take this as an example to explain the process of sealing between the elastic sealing connection part and the transmission rod as the transmission rod moves with the active part:

[0047] Figure 2a express Figure 1 A partial cross-sectional view of the elastic sealing connection area;

[0048] Figure 2b express Figure 2a Partial cross-sectional view after the middle transmission rod is rotated 90°;

[0049] Figure 2c express Figure 2b A partial cross-sectional view of the middle transmission rod after rotating 180°;

[0050] When the transmission rod is Figure 2a Towards Figure 2b , Figure 2c When the state moves, the elastic sealing connection part 03 changes with the movement of the transmission rod and continuously seals the transmission rod; the transmission rod continues to move until Figure 2a state, completing one rotation, and the transmission rod continues to remain sealed during the rotation process of the transmission rod.

[0051] Compared with the prior art, the present invention realizes static sealing of the transmission rod by the elastic sealing connection part by setting each area where the elastic sealing connection part contacts the transmission rod to change with the shape and each area is subjected to constant pressure from the elastic sealing connection part, thereby ensuring uniform sealing effect of each area where the elastic sealing connection part connects with the transmission rod, thereby solving the technical problems of uneven compression, uneven wear and reduced sealing effect after long-term use existing in dynamic seals in the prior art.

[0052] A through hole 031 passing through the transmission rod 04 is provided in the central area of ​​the elastic sealing connection part 03, and the outside of the through hole 031 is a pressure-adjustable annular sealing area 032;

[0053] The outer side of the pressure-adjustable annular sealing area 032 is sealed and fixedly connected to the sealed container 05 .

[0054] Preferably, the cross section of the elastic sealing connection part 03 is circular, and the cross section diameter of the elastic sealing connection part 03 changes gradually from large to small and from small to large from the inside of the sealed container to the outside of the sealed container.

[0055] It should be noted that the gradual change of the cross-sectional diameter of the elastic sealing connection part 03 from large to small and then from small to large helps the elastic sealing connection part 03 to engage with the sealed container to achieve stable sealing.

[0056] Preferably, the diameter of the through hole 031 ranges from 20 mm to 200 mm, and can be 20 mm, 24 mm, 25 mm, 28 mm, 30 mm, 34 mm, 38 mm, 40 mm, 42 mm, 46 mm, 50 mm, 20 mm, 20 mm, 20 mm, 20 mm, 20 mm, 20 mm, 20 mm, 20 mm, 20 mm, 20 mm, 20 mm, 20㎜, 20㎜, 20㎜, 20㎜, 20㎜, 20㎜, 20㎜, 20㎜; the ratio of the diameter of the through hole 031 to the minimum cross-sectional diameter of the elastic sealing connection part 03 satisfies: 1:5~20, for example, it can be 1:5, 6, 7, 8, 9, 10, 12, 15, 16, 17, 18, 19 or 20.

[0057] It should be noted that the ratio of the diameter of the through hole 031 to the minimum cross-sectional diameter of the elastic sealing connection part 03 is too small, resulting in vibration when the transmission rod moves, affecting the seal between the elastic sealing connection part and the sealed container; the ratio of the diameter of the through hole 031 to the minimum cross-sectional diameter of the elastic sealing connection part 03 is too large, resulting in a decrease in the sealing performance between the transmission rod and the elastic sealing connection part 03.

[0058] In a specific embodiment, the pressure-adjustable annular sealing area 032 is a cavity structure filled with fluid, and the contact and elastic sealing between the elastic sealing connection part 03 and the sealing container and the transmission rod are achieved by filling liquid or gas.

[0059] In a possible design, a through hole 031 passing through the transmission rod 04 is provided in the central area of ​​the elastic sealing connection portion 03 , and a cavity filled with liquid or gas is formed to form an air bag structure or a liquid bag structure passing through the transmission rod 04 .

[0060] Specifically, the air bag or liquid bag is connected to the sealed container by hot melting or bonding.

[0061] The performance index range of the cavity material of the airbag or liquid bag is: durable temperature is -40℃~150℃; tensile strength is ≥3MPa; elongation at break is ≥200%.

[0062] It should be noted that if the tensile strength and elongation at break of the cavity material of the airbag or liquid bag are too low, the elastic sealing structure will not be able to form-fit with the transmission rod.

[0063] Specifically, the cavity material of the airbag or liquid bag can be a rubber material, for example, it can be one or more of natural rubber, styrene rubber, isoprene rubber, butyl rubber and nitrile rubber.

[0064] Preferably, the active part 01 , the transmission part 02 and the transmission rod 04 are connected via a three-degree-of-freedom hinge 06 .

[0065] Specifically, two three-degree-of-freedom hinges 06 are provided, one three-degree-of-freedom hinge 06 is connected to one end of the transmission rod 04 and the active part 01 at the same time, and the other three-degree-of-freedom hinge 06 is connected to the other end of the transmission rod 04 and the transmission part 02 at the same time.

[0066] Specifically, the three-degree-of-freedom joint 06 may be a ball joint.

[0067] During implementation, the transmission rod can rotate relative to the active part and the transmission part through the three-degree-of-freedom hinge when the active part and the transmission part rotate; at the same time, the transmission rod rotates in the opposite direction relative to the rotation direction of the active part relative to the inner surface of the through hole.

[0068] It should be noted that when the transmission rod transmits rotation from the active part to the transmission part, the transmission rod rotates in the opposite direction to the rotation direction of the active part relative to the inner surface of the through hole, which can convert the sliding friction of the transmission rod relative to the inner surface of the through hole into rolling friction, greatly reducing the friction force, thereby greatly reducing the friction loss of the elastic sealing connection and improving the service life; at the same time, it avoids the transmission rod driving the movement of the inner surface of the through hole to cause wrinkles on the surface material of the elastic sealing structure, thereby improving the sealing effect.

[0069] As an example, Figure 3 Take the following as an example to explain the process of sealing in the through hole when the transmission rod rotates:

[0070] The center of the cross section of the transmission rod 04 is overlapped with the center of the cross section of the transmission rod 04. The transmission rod 04 rotates with the active part 01. Figure 3 When the center O (the projection of the center axis of the active part 01 and the transmission part 02 on the horizontal plane) rotates, the movement of the transmission rod 04 is explained by taking a point C0 on the outer surface of the transmission rod 04 and a point C0' corresponding to the inner surface of the through hole 031 as examples;

[0071] When the transmission rod 04 rotates 180° clockwise around the center O along the green track, from the left position to the right position, the transmission rod 04 rotates 180° counterclockwise relative to the inner surface of the through hole 031; C0 is transferred from being sealed with C0' to being sealed with C1'.

[0072] When the transmission rod 04 is inserted through the through hole 031 in the central area of ​​the elastic sealing connection part 03, during the process of C0 rotating 180°, it always has rolling friction with the inner surface of the through hole 031 with relatively small friction force. It should be noted that the generation of rolling friction is caused by the deformation of the contact between the object and the plane. Compared with sliding friction, one friction surface in rolling friction is changing, and the contact point is constantly changing; in general, rolling friction is only 1 / 40 to 1 / 60 of the sliding friction resistance.

[0073] Compared with the prior art, the present invention connects the active part, the transmission part and the transmission rod through a three-degree-of-freedom hinge, so that when the active part transmits rotation to the transmission part, the transmission rod rotates in the opposite direction relative to the rotation direction of the active part relative to the inner surface of the through hole, and the sliding friction of the transmission rod relative to the inner surface of the through hole can be converted into rolling friction, which greatly reduces the friction force, thereby greatly reducing the friction loss of the elastic sealing connection and improving the service life; at the same time, it avoids the transmission rod driving the movement of the inner surface of the through hole to cause wrinkles on the surface material of the elastic sealing structure, thereby improving the sealing effect; at the same time, since the transmission rod rotates in the opposite direction relative to the elastic sealing connection, the loss in all directions is uniform, and it is not easy to produce sealing defects, thereby overcoming the problem of uneven sealing loss in the prior art.

[0074] Preferably, the center distance of the three-degree-of-freedom hinge 06 relative to the active part 01 and the transmission part 02 can be adjusted.

[0075] It can be understood that by adjusting the center distance of the three-degree-of-freedom hinge 06 relative to the active part 01 and the transmission part 02 respectively, the speed change of the front and rear transmission parts is adjusted, thereby realizing the speed change of the transmission part.

[0076] Compared with the prior art, the present invention realizes the linear speed adjustment of the transmission part 02 at the same angular velocity of the active part 01 by setting the center distance of the three-degree-of-freedom hinge 06 relative to the active part 01 and the transmission part 02 to be adjustable, thereby conveniently realizing the speed change of the transmission part.

[0077] In a preferred embodiment, a flexible sleeve is provided through the through hole 031;

[0078] The outer periphery of the flexible sleeve is sealed to the pressure-adjustable annular sealing area 032; both ends of the flexible sleeve are sealed to the transmission rod 04, so that the inside of the flexible sleeve is a closed space relative to the inside and outside of the sealed container 05.

[0079] During implementation, the inner diameter of the flexible sleeve is slightly larger than the outer diameter of the transmission rod, so that the transmission rod can have a certain degree of freedom of movement inside the flexible sleeve, which is beneficial to reducing the friction between the two when the transmission rod rotates; at the same time, the outer periphery of the flexible sleeve is sealed with the pressure-adjustable annular sealing area, and the two ends of the flexible sleeve are sealed with the transmission rod to maintain a seal inside and outside the sealed container; and the flexibility of the flexible sleeve ensures that the flexible sleeve itself will not be damaged when the transmission rod rotates, thereby destroying the seal.

[0080] Specifically, the flexible sleeve and the pressure-adjustable annular sealing area can be integrally formed, hot-melt connected or bonded.

[0081] Preferably, the flexible sleeve may be a flexible plastic tube or a corrugated tube.

[0082] Specifically, the flexible plastic tube is sealed and connected to the transmission rod by hot melting or bonding; the corrugated tube is sealed and connected to the transmission rod by bonding or mechanical sealing.

[0083] In a possible design, the elastic sealing connection part 03 and the transmission rod 04 are integrally formed, the cavity material of the airbag or liquid bag is rubber, and the flexible sleeve is silicone.

[0084] In order to achieve follow-up during the movement of the transmission rod 04 and avoid the sealing loss between the transmission rod 04 and the elastic sealing connection part 03 caused by the movement of the transmission rod 04, the connection part between the airbag or liquid bag and the flexible sleeve is set near the center of the transmission rod 04.

[0085] In a second aspect, the present invention further discloses a novel sealing method based on deformation of a flexible sealing element, using the above-mentioned sealing structure.

[0086] In order to further illustrate the present invention, the following examples and comparative examples are provided:

[0087] Example 1

[0088] This embodiment discloses a wear-free sealing structure based on a flexible sealing element, such as Figure 1-2c As shown, it includes: an active part 01, a transmission part 02 and a sealed container 05; the active part 01 is located outside the sealed container 05, and the transmission part 02 is located inside the sealed container 05;

[0089] The active part 01 and the transmission part 02 are connected by a transmission rod 04;

[0090] An elastic sealing connection part 03 is provided on the sealed container between the active part 01 and the transmission part 02; the transmission rod 04 passes through the elastic sealing connection part 03 and is sealedly connected with the sealed container 05 through the elastic sealing connection part 03;

[0091] When the transmission rod 04 moves with the active part 01 , each area where the elastic sealing connection part 03 contacts the transmission rod 04 changes in shape and the pressure exerted by the elastic sealing connection part on each area remains unchanged.

[0092] As the transmission rod 04 moves with the active part 01, the areas where the elastic sealing connection part 03 contacts the transmission rod 04 change accordingly. Since the transmission rod 04 is in a swinging motion, the sealing structure can achieve close contact between the elastic sealing connection part and the transmission rod without relative sliding through its own elastic deformation, thereby replacing the dynamic seal with a static seal and effectively avoiding the elastic wear of the sealing element. At the same time, the pressure on the outer surface of the transmission rod by the elastic sealing connection part remains unchanged, ensuring a uniform sealing effect on the areas where the elastic sealing connection part connects to the transmission rod.

[0093] by Figure 2a-2c Take this as an example to explain the process of sealing between the elastic sealing connection part and the transmission rod as the transmission rod moves with the active part:

[0094] Figure 2a express Figure 1 A partial cross-sectional view of the elastic sealing connection area;

[0095] Figure 2b express Figure 2a Partial cross-sectional view after the middle transmission rod is rotated 90°;

[0096] Figure 2c express Figure 2b A partial cross-sectional view of the middle transmission rod after rotating 180°;

[0097] When the transmission rod is Figure 2a Towards Figure 2b , Figure 2c When the state moves, the elastic sealing connection part 03 changes with the movement of the transmission rod and continuously seals the transmission rod; the transmission rod continues to move until Figure 2a state, completing one rotation, and the transmission rod continues to remain sealed during the rotation process of the transmission rod.

[0098] The active part and the transmission part are connected by a transmission rod; the length of the transmission rod is 40 cm; the distance between the active part and the transmission rod and the center of the active part is 10 cm; the distance between the transmission part and the transmission rod and the center of the transmission part is 10 cm. The ratio of the diameter of the through hole 031 to the minimum diameter of the cross section of the elastic sealing connection part 03 is 1:5.

[0099] The pressure-adjustable annular sealing area 032 is filled with air at a pressure of 1.5 bar, which is slightly greater than one atmosphere so that the elastic sealing structure is in an expanded state.

[0100] The performance indicators of the surface material of the pressure-adjustable annular sealing area 032 are tensile strength 3MPa and elongation at break 200%. The material of the pressure-adjustable annular sealing area 032 is natural rubber.

[0101] The elastic sealing connection part 03 includes an outer pressure-adjustable annular sealing area 032 and a through hole 031 at the center that penetrates the elastic sealing connection part; the diameter of the through hole 031 is 8 cm. The pressure-adjustable annular sealing area 032 is an airbag. The airbag is connected to the sealed container by hot melting.

[0102] During implementation, the pressure-adjustable annular sealing area 032 maintains an air pressure greater than that inside and outside the sealed container 05 so that it is in an expanded state; the outer surface of the transmission rod 04 located in the through hole 031 area abuts against the inner wall of the through hole 031, and under the action of the pressure in the annular sealing area, the transmission rod 04 is sealed and fixedly connected with the elastic sealing connection part 03.

[0103] The two ends of the active part 01, the transmission part 02 and the transmission rod 04 are connected by a three-degree-of-freedom hinge 06. When the active part 01 and the transmission part 02 rotate, the transmission rod 04 can rotate relative to the active part 01 and the transmission part 02 through the three-degree-of-freedom hinge; at the same time, the transmission rod 04 rotates relative to the inner surface of the through hole 031 in the opposite direction of the rotation direction of the active part 01.

[0104] When the transmission rod 04 transmits rotation from the active part 01 to the transmission part 02, the inner surface of the through hole 031 rotates in the opposite direction to the rotation direction of the active part 01, which can convert the sliding friction of the transmission rod 04 relative to the inner surface of the through hole 031 into rolling friction, greatly reducing the friction force, thereby greatly reducing the friction loss of the elastic sealing connection, increasing the service life, and improving the sealing effect.

[0105] This embodiment also discloses a new sealing method based on deformation of a flexible sealing element, using the sealing structure of this embodiment.

[0106] Using the sealing structure of this embodiment, the active part was rotated at a speed of 100 rpm for 24 hours, and the sealing performance of the sealing structure was measured. The pressure drop within 1 hour was less than 100 Pa.

[0107] Example 2

[0108] This embodiment discloses a wear-free sealing structure based on a flexible sealing element, such as Figure 1-2c As shown, it includes: an active part 01, a transmission part 02 and a sealed container 05; the active part 01 is located outside the sealed container 05, and the transmission part 02 is located inside the sealed container 05;

[0109] The active part 01 and the transmission part 02 are connected by a transmission rod 04;

[0110] An elastic sealing connection part 03 is provided on the sealed container between the active part 01 and the transmission part 02; the transmission rod 04 passes through the elastic sealing connection part 03 and is sealedly connected with the sealed container 05 through the elastic sealing connection part 03;

[0111] When the transmission rod 04 moves with the active part 01 , each area where the elastic sealing connection part 03 contacts the transmission rod 04 changes in shape and the pressure exerted by the elastic sealing connection part on each area remains unchanged.

[0112] As the transmission rod 04 moves with the active part 01, the areas where the elastic sealing connection part 03 contacts the transmission rod 04 change accordingly. Since the transmission rod 04 is in a swinging motion, the sealing structure can achieve close contact between the elastic sealing connection part and the transmission rod without relative sliding through its own elastic deformation, thereby replacing the dynamic seal with a static seal and effectively avoiding the elastic wear of the sealing element. At the same time, the pressure on the outer surface of the transmission rod by the elastic sealing connection part remains unchanged, ensuring a uniform sealing effect on the areas where the elastic sealing connection part connects to the transmission rod.

[0113] by Figure 2a-2c Take this as an example to explain the process of sealing between the elastic sealing connection part and the transmission rod as the transmission rod moves with the active part:

[0114] Figure 2a express Figure 1 A partial cross-sectional view of the elastic sealing connection area;

[0115] Figure 2b express Figure 2a Partial cross-sectional view after the middle transmission rod is rotated 90°;

[0116] Figure 2c express Figure 2b A partial cross-sectional view of the middle transmission rod after rotating 180°;

[0117] When the transmission rod is Figure 2a Towards Figure 2b , Figure 2c When the state moves, the elastic sealing connection part 03 changes with the movement of the transmission rod and continuously seals the transmission rod; the transmission rod continues to move until Figure 2a state, completing one rotation, and the transmission rod continues to remain sealed during the rotation process of the transmission rod.

[0118] The active part and the transmission part are connected by a transmission rod; the length of the transmission rod is 50 cm; the distance between the connection between the active part and the transmission rod and the center of the active part is 10 cm; the distance between the transmission part and the transmission rod and the center of the transmission part is 10 cm.

[0119] The ratio of the diameter of the through hole 031 to the minimum cross-sectional diameter of the elastic sealing connection portion 03 is 1:15.

[0120] The pressure-adjustable annular sealing area 032 is filled with air at a pressure of 1.5 bar, which is slightly greater than one atmosphere so that the elastic sealing structure is in an expanded state.

[0121] The performance indicators of the surface material of the pressure-adjustable annular sealing area 032 are tensile strength 3.5 MPa and elongation at break 240%. The material of the pressure-adjustable annular sealing area 032 is nitrile rubber.

[0122] The elastic sealing connection part 03 includes an outer pressure-adjustable annular sealing area 032 and a through hole 031 at the center that penetrates the elastic sealing connection part; the diameter of the through hole 031 is 10 cm. The pressure-adjustable annular sealing area 032 is an airbag. The airbag is connected to the sealed container by hot melting.

[0123] During implementation, the pressure-adjustable annular sealing area 032 maintains an air pressure greater than that inside and outside the sealed container 05 so that it is in an expanded state; the outer surface of the transmission rod 04 located in the through hole 031 area abuts against the inner wall of the through hole 031, and under the action of the pressure in the annular sealing area, the transmission rod 04 is sealed and fixedly connected with the elastic sealing connection part 03.

[0124] The two ends of the active part 01, the transmission part 02 and the transmission rod 04 are connected by a three-degree-of-freedom hinge 06. When the active part 01 and the transmission part 02 rotate, the transmission rod 04 can rotate relative to the active part 01 and the transmission part 02 through the three-degree-of-freedom hinge; at the same time, the transmission rod 04 rotates relative to the inner surface of the through hole 031 in the opposite direction of the rotation direction of the active part 01.

[0125] When the transmission rod 04 transmits rotation from the active part 01 to the transmission part 02, the inner surface of the through hole 031 rotates in the opposite direction to the rotation direction of the active part 01, which can convert the sliding friction of the transmission rod 04 relative to the inner surface of the through hole 031 into rolling friction, greatly reducing the friction force, thereby greatly reducing the friction loss of the elastic sealing connection, increasing the service life, and improving the sealing effect.

[0126] This embodiment also discloses a new sealing method based on deformation of a flexible sealing element, using the sealing structure of this embodiment.

[0127] Using the sealing structure of this embodiment, the active part was rotated at 600 rpm for 24 hours, and the sealing performance of the sealing structure was measured. No obvious pressure drop was found within 1 hour.

[0128] Example 3

[0129] The present embodiment discloses a wear-free sealing structure and a novel sealing method based on a flexible sealing element. Compared with Embodiment 2, the present embodiment differs in that: a flexible sleeve passing through the through hole is added at the through hole compared with Embodiment 2; the outer periphery of the flexible sleeve is sealed and connected to the pressure-adjustable annular sealing area; the two ends of the flexible sleeve are sealed and connected to the transmission rod, so that the interior of the flexible sleeve is a closed space relative to the inside and outside of the sealed container.

[0130] The flexible sleeve is made of silicone and is integrally formed with the pressure-adjustable annular sealing area.

[0131] Using the sealing structure of this embodiment, the active part was rotated at 600 rpm for 24 hours, and the sealing performance of the sealing structure was measured. No obvious pressure drop was found within 1 hour.

[0132] Comparative Example 1

[0133] This comparative example discloses a wear-free sealing structure and a novel sealing method based on a flexible sealing element. Compared with Example 2, the difference is that the active part 01, the transmission part 02 and the transmission rod 04 are fixedly connected.

[0134] Using the sealing structure of this comparative example, after the active part was rotated at 600 rpm for 24 hours, the sealing performance of the sealing structure was measured and it was found that the pressure could not be maintained and the flexible sealing material was damaged. The damaged part was the sealing connection between the transmission rod and the elastic sealing connection part.

[0135] Comparative Example 2

[0136] This comparative example discloses a wear-free sealing structure and a novel sealing method based on a flexible sealing element. The difference from Example 2 is that the ratio of the diameter of the through hole to the minimum cross-sectional diameter of the elastic sealing connection portion is 1:2, which does not meet the protection scope of the present invention of 1:5 to 20.

[0137] Using the sealing structure of this comparative example, after the active part was rotated at 600 rpm for 24 hours, the sealing performance of the sealing structure was measured and it was found that the pressure could not be maintained and the flexible sealing material was damaged. The damaged part was the sealing connection between the elastic sealing connection part and the sealed container.

[0138] Comparative Example 3

[0139] This comparative example discloses a wear-free sealing structure and a novel sealing method based on a flexible sealing element. The difference with respect to Example 2 is that the ratio of the diameter of the through hole to the minimum cross-sectional diameter of the elastic sealing connection portion is 1:30, which does not meet the protection scope of the present invention of 1:5 to 20.

[0140] Using the sealing structure of this comparative example, after the active part was rotated at 600 rpm for 24 hours, the sealing performance of the sealing structure was measured and it was found that the pressure could not be maintained and the flexible sealing material was damaged. The damaged part was the sealing connection between the transmission rod and the elastic sealing connection part.

[0141] Comparative Example 4

[0142] This comparative example discloses a wear-free sealing structure and a novel sealing method based on a flexible sealing element. The difference from Example 2 is that the performance index of the surface material of the elastic sealing structure is a tensile elongation of 160%, which does not meet the protection scope of the present invention.

[0143] Using the sealing structure of this comparative example, after the active part was rotated at 600 rpm for 24 hours, the sealing performance of the sealing structure was measured and found that the pressure could not be maintained and the flexible sealing material was damaged.

[0144] By comparing Examples 1 and 2 with Comparative Examples 1-4, it can be seen that the active part, the transmission part and the transmission rod are hingedly connected through three degrees of freedom, the ratio of the diameter of the through hole to the minimum cross-sectional diameter of the elastic sealing connection part satisfies 1:5-20, and the tensile elongation of the surface material of the elastic sealing structure is ≥200%, which helps to improve the service life of the sealing structure and the long-term sealing effect.

[0145] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A sealing structure based on deformation of a flexible sealing element, characterized in that: The sealing structure comprises: an active part, a transmission part, a transmission rod and a sealing container; The active part is located outside the sealed container, and the transmission part is located inside the sealed container; The active part and the transmission part are connected by a transmission rod; An elastic sealing connection part is provided on the sealing container between the active part and the transmission part; The transmission rod passes through the elastic sealing connection portion and is sealedly connected to the sealing container through the elastic sealing connection portion; When the transmission rod moves with the active part, each area where the elastic sealing connection part contacts the transmission rod changes with the shape and the pressure exerted by the elastic sealing connection part on each area remains unchanged.

2. The sealing structure based on deformation of the flexible sealing element according to claim 1, characterized in that: A through hole is provided in the central area of ​​the elastic sealing connection portion; The outside of the through hole is an annular sealing area with adjustable pressure; The outer side of the pressure-adjustable annular sealing area is sealed and fixedly connected to the sealing container.

3. The sealing structure based on deformation of the flexible sealing element according to claim 2, characterized in that: The cross section of the elastic sealing connection part is circular, and the cross section diameter of the elastic sealing connection part changes gradually from large to small and then from small to large from the side of the sealed container to the outside of the sealed container.

4. The sealing structure based on deformation of the flexible sealing element according to claim 3, characterized in that: The ratio of the diameter of the through hole to the minimum cross-sectional diameter of the elastic sealing connection portion satisfies: 1:5-20.

5. The sealing structure based on deformation of the flexible sealing element according to claim 2, characterized in that: The pressure-adjustable annular sealing area is a cavity structure filled with fluid, and the contact and elastic sealing between the elastic sealing connection part and the transmission rod are achieved by filling liquid or gas.

6. The sealing structure based on deformation of the flexible sealing element according to claim 5, characterized in that: The performance index range of the surface material of the elastic sealing structure meets the following requirements: tensile strength ≥ 3MPa; elongation at break ≥ 200%.

7. The sealing structure based on deformation of a flexible sealing element according to any one of claims 1 to 6, characterized in that: The active part, the transmission part and the transmission rod are hingedly connected via three degrees of freedom.

8. The sealing structure based on deformation of the flexible sealing element according to claim 7, characterized in that: There are two three-degree-of-freedom hinges, one of which is connected to one end of the transmission rod and the active part at the same time, and the other three-degree-of-freedom hinge is connected to the other end of the transmission rod and the transmission part at the same time.

9. The sealing structure based on deformation of the flexible sealing element according to claim 8, characterized in that: The center distance of the three-degree-of-freedom hinge relative to the active part and the center distance relative to the transmission part can be adjusted.

10. A sealing method based on deformation of a flexible sealing element, characterized in that: Use the sealing structure based on deformation of the flexible sealing element as described in any one of claims 1 to 9.

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