A new dynamic sealing structure

Abstract

The present application provides a new type of dynamic sealing structure, including: a fixed part, the fixed part having a accommodating cavity; a movable part, the movable part having a movable end; the movable end is located in the accommodating cavity and can reciprocate in the accommodating cavity; a sealing part, the sealing part is connected to the movable end; the sealing part includes a sealing portion; the sealing portion is sealed and fitted with the inner wall of the accommodating cavity; an elastic part, the elastic part is arranged on the side of the sealing portion away from the inner wall of the accommodating cavity, and is in a force storage state, for providing a force pressing toward the sealing portion so that the sealing portion is always tightly fitted with the inner wall of the accommodating cavity. The new type of dynamic sealing structure of the present application, by providing an elastic part in a force storage state, will make the outer wall of the sealing portion of the sealing part always close to the inner wall of the accommodating cavity, thereby ensuring that the sealing performance will not decrease after long-term use; in addition, the provision of the elastic part in the force storage state can also increase the sealing performance under low temperature conditions.

Description

Technical Field

[0001] The present application relates to the technical field of mechanical seals, and in particular to a novel dynamic seal structure. Background Art

[0002] An air compressor is a device used to compress gas. There are many types of air compressors. A piston compressor is a positive displacement compressor whose compression element is a piston. The air is compressed by driving the piston to make reciprocating motions in the cylinder. The end of the piston rod of the air compressor is provided with a sealing structure for sealing with the inner wall of the cylinder. When in use, the piston rod of the air compressor will reciprocate in the cylinder. During the movement, the sealing structure will rub against the inner wall of the cylinder. Long-term use will cause the sealing structure to wear, resulting in a gap between it and the inner wall of the cylinder, which can easily cause gas leakage and lead to a decrease in sealing performance. To this end, the present application proposes a new type of dynamic sealing structure. Summary of the Invention

[0003] The purpose of this application is to provide a new dynamic sealing structure to address the above problems.

[0004] The present application provides a novel dynamic sealing structure, comprising:

[0005] A fixing member, wherein the fixing member has an accommodating cavity;

[0006] A moving member having a moving end; the moving end is located in the accommodating cavity and can reciprocate in the accommodating cavity;

[0007] A sealing member connected to the movable end; the sealing member includes a sealing portion; the sealing portion is in sealing contact with the inner wall of the accommodating cavity;

[0008] An elastic member is arranged on a side of the sealing portion away from the inner wall of the accommodating cavity and is in a force storage state, and is used to provide a force pressing toward the sealing portion so that the sealing portion is always in close contact with the inner wall of the accommodating cavity.

[0009] According to the technical solutions provided in certain embodiments of the present application, the mobile end is provided with a first supporting portion; a first connecting portion is provided on a side of the first supporting portion relatively away from the mobile end; and the first connecting portion forms a boss structure relative to the first supporting portion.

[0010] According to the technical solutions provided in certain embodiments of the present application, the sealing member includes a second connecting portion and a circle of the sealing portion arranged on the edge of the second connecting portion; a first through hole is opened on the second connecting portion; and the first through hole is sleeved on the first connecting portion.

[0011] According to the technical solutions provided in certain embodiments of the present application, the elastic member includes a third connecting portion and a circle of elastic portions arranged on the edge of the third connecting portion; a second through hole is provided on the third connecting portion; and the second through hole is sleeved on the first connecting portion.

[0012] According to the technical solutions provided in certain embodiments of the present application, the elastic portion includes a plurality of elastic teeth distributed at equal intervals.

[0013] According to the technical solution provided in certain embodiments of the present application, the elastic member also includes a number of fourth connecting parts that are the same in number as the elastic teeth; the fourth connecting parts are used to connect the elastic teeth and the third connecting parts; the two side edges of the fourth connecting parts are respectively step structures; and the bottom of the step structure is connected to the third connecting part.

[0014] According to the technical solutions provided in certain embodiments of the present application, a first angle is formed between the sealing portion and the second connecting portion; a second angle is formed between the elastic portion and the third connecting portion; and the first angle is smaller than the second angle.

[0015] According to the technical solution provided in certain embodiments of the present application, a clamping groove is provided on the side of the first support portion away from the movable end; a clamping protrusion is provided on the side of the second connecting portion close to the first support portion; and the clamping protrusion is embedded in the clamping groove.

[0016] According to the technical solutions provided in certain embodiments of the present application, the novel dynamic sealing structure further includes a pressing member; the pressing member is arranged on the side of the elastic member away from the sealing member; the pressing member has a third through hole; the third through hole is interference fit with the first connecting portion.

[0017] Compared with the prior art, the beneficial effects of the present application are as follows: the new dynamic sealing structure, by arranging an elastic member in a force storage state inside the space formed by the seal, the elastic member will make the outer side wall of the sealing part of the seal close to the inner wall of the accommodating cavity, thereby greatly improving the sealing performance; after a certain period of use, the outer side wall of the sealing part of the seal will be worn, resulting in a gap between the sealing part and the inner wall of the fixing part, and the elastic member will gradually rebound and deform, so that the sealing part of the seal will close to the inner wall of the accommodating cavity, thereby ensuring that the sealing performance will not decrease after long-term use; in addition, the setting of the elastic member in the force storage state will also overcome the shrinkage of the seal along its diameter direction under low temperature conditions, thereby increasing the sealing performance under low temperature conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of a novel dynamic sealing structure provided in an embodiment of the present application;

[0019] Figure 2An exploded view of a novel dynamic sealing structure provided in an embodiment of the present application;

[0020] Figure 3 A cross-sectional view of a novel dynamic sealing structure provided in an embodiment of the present application;

[0021] Figure 4 A schematic structural diagram of a boss structure of a novel dynamic sealing structure provided in an embodiment of the present application;

[0022] Figure 5 A schematic structural diagram of a seal member of a novel dynamic sealing structure provided in an embodiment of the present application;

[0023] Figure 6 A schematic structural diagram of the elastic member of the novel dynamic sealing structure provided in an embodiment of the present application.

[0024] The text annotations in the figure represent:

[0025] 1. Fixed part; 2. Moving part; 3. Sealing part; 301. Sealing portion; 302. Second connecting portion; 303. First through hole; 304. Pressing protrusion; 4. Elastic part; 401. Third connecting portion; 402. Elastic part; 403. Second through hole; 404. Fourth connecting portion; 5. Boss structure; 501. First supporting portion; 502. First connecting portion; 503. Pressing groove; 6. Pressing part; 601. Third through hole. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is described in detail below with reference to the accompanying drawings. The description in this section is only exemplary and explanatory and should not have any limiting effect on the scope of protection of the present application.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0028] Please refer to Figures 1 to 3 This embodiment provides a new dynamic sealing structure, which is applied to a piston air compressor and includes a fixed part 1, a moving part 2, a sealing part 3, an elastic part 4 and a pressing part 6.

[0029] The fixing member 1 is the cylinder body of the air compressor, which is a hollow cylindrical structure with an accommodating cavity inside. Only a part of the cylinder body is shown in the figure.

[0030] The moving part 2 is the piston rod of the air compressor. One end of the piston rod is connected to the driving mechanism, and the other end extends into the cylinder body. The end extending into the cylinder body is its moving end. The moving end is located in the accommodating cavity and can reciprocate in the accommodating cavity. The driving mechanism here is a conventional mechanism in the prior art, and its function is to drive the piston rod to reciprocate. The specific structure of the driving mechanism will not be repeated here.

[0031] Please refer to further Figure 4 The mobile end is provided with a first supporting portion 501 ; a first connecting portion 502 is provided on a side of the first supporting portion 501 relatively away from the mobile end; the first connecting portion 502 forms a boss structure 5 relative to the first supporting portion 501 .

[0032] Specifically, the first support portion 501 is a disc structure, the diameter of which is larger than the diameter of the piston rod and slightly smaller than the diameter of the accommodating cavity of the fixing part 1. A first connecting portion 502 is provided at the end of the first support portion 501 away from the piston rod; the first connecting portion 502 is a cylindrical structure with a shorter length, and the diameter of the first connecting portion 502 is smaller than the diameter of the first support portion 501; the first support portion 501 and the first connecting portion 502 together form a boss structure 5; the movable part 2, the first support portion 501 and the first connecting portion 502 are coaxially arranged, and the three are formed as one piece.

[0033] Please refer to further Figure 5 , the sealing member 3 is connected to the movable end; the sealing member 3 includes a second connecting portion 302 and a circle of the sealing portion 301 arranged on the edge of the second connecting portion 302; the sealing portion 301 is sealed and fitted with the inner wall of the accommodating cavity; a first through hole 303 is opened on the second connecting portion 302; the first through hole 303 is sleeved on the first connecting portion 502.

[0034] Specifically, the sealing member 3 can be a leather bowl made of rubber material, which is an integrally molded part. The sealing member 3 has a bowl-shaped structure, the bottom of the bowl is close to the boss structure 5, and the direction of the bowl mouth is away from the boss structure 5; the second connecting portion 302 is equivalent to the bottom of the bowl, and a first through hole 303 is provided thereon, and the diameter of the first through hole 303 is slightly larger than the diameter of the first connecting portion 502, and the sealing member 3 is sleeved on the first connecting portion 502 through the first through hole 303; the sealing portion 301 is connected to the second connecting portion 302 in an arc-shaped transition; the outer surface of the sealing portion 301 is sealed in fit with the inner wall of the accommodating cavity.

[0035] Please refer to further Figure 6The elastic member 4 is arranged on the side of the sealing portion 301 away from the inner wall of the accommodating cavity and is in a force storage state, and is used to provide a force pressing toward the sealing portion 301, that is, to apply pressure to the sealing portion 301 so that the sealing portion 301 is always in close contact with the inner wall of the accommodating cavity.

[0036] Specifically, the elastic part 4 includes a third connecting part 401 and a circle of elastic part 402 arranged on the edge of the third connecting part 401; the elastic part 4 can be specifically a spring sheet, which can be made of materials such as phosphor bronze, tin bronze, and 65Mn, 55Si2Mn, 302 or 316 flat steel strips. It is an integrally formed part. The elastic part 4 is located in the space formed by the seal 3, and it also has a bowl-shaped structure. The bottom of the bowl is close to the second connecting part 302 of the seal 3, and the direction of the bowl mouth is away from the second connecting part 302; a second through hole 403 is opened on the third connecting part 401; the diameter of the second through hole 403 is slightly larger than the diameter of the first connecting part 502, and the elastic part 4 is sleeved on the first connecting part 502 through the second through hole 403; the elastic part 402 is connected to the third connecting part 401 in an arc-shaped transition; the outer surface of the elastic part 402 is tightly fitted with the inner surface of the sealing part 301.

[0037] After the new sealing structure is assembled, the elastic part 4 is in a force storage state, that is, an elastic deformation state, and the outer surface of the elastic part 402 of the elastic part 4 is pressed against the inner surface of the sealing part 301, exerting a force on the sealing part 301 so that the outer surface of the sealing part 301 is sealed to the inner wall of the accommodating cavity; during use, when the outer surface of the sealing part 301 is worn due to repeated reciprocating motions of the movable part 2, resulting in a gap between the outer surface of the sealing part 301 and the inner surface of the fixed part 1, the elastic part 402 of the elastic part 4 will gradually rebound, that is, gradually restore the deformation, and continue to apply a pressing force to it from the inner surface of the sealing part 301, so that the sealing part 301 of the seal 3 is always tightly fitted with the inner wall of the accommodating cavity, avoiding gas leakage and ensuring that the sealing performance is not reduced.

[0038] Furthermore, the elastic portion 402 includes a plurality of elastic teeth distributed at equal intervals.

[0039] Specifically, in this embodiment, a total of 24 elastic teeth are included, and the 24 elastic teeth are evenly distributed along the circumference on the edge of the third connecting part 401, and a gap is left between two adjacent elastic teeth. By adopting the above technical solution, the elastic part 402 has a better rebound effect, which facilitates rebound.

[0040] Furthermore, in order to improve the pressing effect of the elastic portion 402 on the sealing portion 301 , elastic protrusions may be optionally provided on the outer side wall of the elastic portion 402 , thereby achieving a better pressing effect.

[0041] Furthermore, the elastic member 4 also includes a number of fourth connecting parts 404, the number of which is the same as the number of the elastic teeth; the fourth connecting part 404 is used to connect the elastic teeth and the third connecting part 401; the two side edges of the fourth connecting part 404 are respectively step structures; the bottom of the step structure is connected to the third connecting part 401.

[0042] Specifically, in this embodiment, a total of 24 fourth connecting parts 404 are included, and the 24 fourth connecting parts 404 correspond one-to-one to the 24 elastic teeth; the fourth connecting part 404 is a convex structure, that is, its two side edges are step structures, the bottom of the convex structure is connected to the third connecting part 401, and the top of the convex structure is connected to the elastic part 402.

[0043] Furthermore, a first angle is formed between the sealing portion 301 and the second connecting portion 302 ; a second angle is formed between the elastic portion 402 and the third connecting portion 401 ; and the first angle is smaller than the second angle.

[0044] Specifically, the value range of the first angle is 99.5°~100.5°, and the value range of the second angle is 102°~103°. In this embodiment, the first angle is 100°, and the second angle is 102.5°. By adopting the above technical solution, since the molding angle of the elastic part 4 is larger than the molding angle of the sealing part 3, the elastic part 4 can make the sealing part 301 of the sealing part 3 stick outward to the inner wall of the accommodating cavity where it is located, avoiding gas leakage from the gap between the sealing part 301 and the inner wall of the accommodating cavity during operation, thereby increasing the sealing performance of the moving part 2 during movement.

[0045] Please refer to further Figure 4 and Figure 5 A clamping groove 503 is provided on the side of the first supporting portion 501 away from the moving end; a clamping protrusion 304 is provided on the side of the second connecting portion 302 close to the first supporting portion 501; and the clamping protrusion 304 is embedded in the clamping groove 503.

[0046] Specifically, a ring-shaped clamping groove 503 is provided on the first support portion 501, and a ring-shaped clamping protrusion 304 is provided on the seal 3; the shape and size of the clamping groove 503 match the shape and size of the clamping protrusion 304; by adopting the above technical solution, the seal 3 and the boss structure 5 can be installed more stably.

[0047] Furthermore, the novel dynamic sealing structure further includes a pressing member 6 ; the pressing member 6 is arranged on a side of the elastic member 4 away from the sealing member 3 ; the pressing member 6 has a third through hole 601 ; the third through hole 601 is interference fit with the first connecting portion 502 .

[0048] Specifically, the clamping member 6 is a circular ring structure, and the diameter of the third through hole 601 is slightly smaller than the diameter of the first connecting part 502. The clamping member 6 is interference fit with the first connecting part 502 through the third through hole 601, and plays the role of compressing the elastic member 4 and the sealing member 3. By compressing the elastic member 4 and the sealing member 3, it is ensured that the elastic member 4 and the sealing member 3 are tightly fitted inside after installation.

[0049] The novel dynamic sealing structure provided in this embodiment has the following advantages:

[0050] (1) By arranging an elastic member 4 in a force storage state inside the space formed by the sealing member 3, the elastic member 4 causes the outer wall of the sealing portion 301 of the sealing member 3 to be pressed outward against the inner wall of the accommodating cavity, thereby greatly improving the sealing performance; after a certain period of use, the outer wall of the sealing portion 301 of the sealing member 3 will wear out, causing the diameter to decrease. Since the elastic member 4 causes the sealing portion 301 of the sealing member 3 to be pressed outward against the inner wall of the accommodating cavity, the sealing performance will not be reduced;

[0051] (2) The arrangement of the elastic member 4 in the force storage state can also overcome the shrinkage of the sealing member 3 along its diameter direction under low temperature conditions, thereby increasing the sealing performance under low temperature conditions.

[0052] It should be noted that this embodiment uses an application scenario requiring air sealing as an example to explain in detail the novel dynamic sealing structure of the present invention. In addition, the novel dynamic sealing structure of the present invention can also be applied to application scenarios requiring liquid sealing.

[0053] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A new type of dynamic sealing structure, characterized in that: include: A fixing member (1), wherein the fixing member (1) has a receiving cavity; A moving member (2), the moving member (2) having a moving end; the moving end is located in the accommodating cavity and can reciprocate in the accommodating cavity; A sealing member (3), the sealing member (3) being connected to the movable end; the sealing member (3) comprising a sealing portion (301); the sealing portion (301) being in sealing contact with the inner wall of the accommodating cavity; an elastic member (4), the elastic member (4) being arranged on a side of the sealing portion (301) away from the inner wall of the accommodating cavity and being in a force storage state, for providing a force pressing toward the sealing portion (301) so that the sealing portion (301) is always in close contact with the inner wall of the accommodating cavity; The mobile end is provided with a first supporting portion (501); a first connecting portion (502) is provided on a side of the first supporting portion (501) relatively away from the mobile end; the first connecting portion (502) forms a boss structure (5) relative to the first supporting portion (501); The sealing member (3) comprises a second connecting portion (302) and a circle of the sealing portion (301) arranged at the edge of the second connecting portion (302); a first through hole (303) is provided on the second connecting portion (302); the first through hole (303) is sleeved on the first connecting portion (502); The elastic member (4) comprises a third connecting portion (401) and a circle of elastic portions (402) arranged at the edge of the third connecting portion (401); a second through hole (403) is provided on the third connecting portion (401); the second through hole (403) is sleeved on the first connecting portion (502); The elastic member (4) has a bowl-shaped structure, the bottom of the bowl is close to the second connecting portion (302) of the sealing member (3), and the bowl mouth is in a direction away from the second connecting portion (302); the outer surface of the elastic portion (402) is in close contact with the inner surface of the sealing portion (301); A first angle is formed between the sealing portion (301) and the second connecting portion (302); a second angle is formed between the elastic portion (402) and the third connecting portion (401); the first angle is smaller than the second angle; It also includes a pressing member (6); the pressing member (6) is arranged on a side of the elastic member (4) away from the sealing member (3); the pressing member (6) has a third through hole (601); the third through hole (601) is interference-fitted with the first connecting portion (502).

2. The novel dynamic sealing structure according to claim 1 is characterized in that: The elastic portion (402) comprises a plurality of elastic teeth distributed at equal intervals.

3. The novel dynamic sealing structure according to claim 2 is characterized in that: The elastic member (4) further comprises a plurality of fourth connecting portions (404) whose number is the same as that of the elastic teeth; the fourth connecting portions (404) are used to connect the elastic teeth and the third connecting portion (401); both side edges of the fourth connecting portion (404) are respectively step structures; the bottom of the step structure is connected to the third connecting portion (401).

4. The novel dynamic sealing structure according to claim 1 is characterized in that: A clamping groove (503) is provided on a side of the first supporting portion (501) away from the movable end; a clamping protrusion (304) is provided on a side of the second connecting portion (302) close to the first supporting portion (501); and the clamping protrusion (304) is embedded in the clamping groove (503).

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