Self-tightening valve rod dustproof structure

Abstract

The utility model relates to a self-tightening type valve rod dustproof structure which comprises a valve body, a valve rod cavity is formed in the valve body, and a bearing is arranged in the valve rod cavity. The valve rod is arranged in the bearing in a penetrating mode, one end of the valve rod in the axial direction is connected with a valve element, and the valve rod is provided with a first step close to the valve element in the axial direction. The sealing structure is arranged between the end, close to the valve element in the axial direction, of the bearing and the first step, and the first step is in inclined face fit with the sealing structure. The first step is arranged on the valve rod, the sealing structure is arranged between the bearing and the first step, and the sealing structure is matched with the inclined surface of the first step, so that when the valve is in a high-pressure working condition, the valve rod tends to move upwards under the action of internal pressure; the purpose that the valve rod and the sealing structure are pressed more and more tightly along with increase of pressure is achieved, it is effectively guaranteed that a medium in a middle cavity of the valve cannot enter a bearing cavity to cause pulling damage to a bearing and the valve rod, and therefore the service life of the valve is effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a self-tightening valve stem dust-proof structure. Background Art

[0002] At present, in the existing valve dust prevention technical solutions, the following two methods are usually used for sealing and dust prevention: Method 1, filling sealing packing between the valve stem and the valve stem cavity, and relying on external force to compress the packing to play a role in sealing and dust prevention; Method 2, adding a dustproof groove at the bottom of the bearing in the valve stem cavity, and achieving the purpose of dust prevention by installing an "O"-ring or graphite rope. The above dustproof schemes are prone to failure under high pressure conditions, causing medium particles to enter the valve stem cavity, resulting in valve stem strain, and thus causing a shorter valve life. Utility Model Content

[0003] In view of the shortcomings of the prior art mentioned above, the purpose of the utility model is to provide a self-tightening valve stem dustproof structure, which is used to solve the problem that the existing valve dustproof design is prone to sealing failure under high-pressure conditions, causing medium particles to enter the valve stem cavity, resulting in valve stem strain, and thus causing a shorter valve life.

[0004] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a self-tightening valve stem dust-proof structure, comprising:

[0005] A valve body, wherein a valve stem cavity is provided on the valve body, and a bearing is provided in the valve stem cavity;

[0006] A valve stem is inserted into the bearing, one end of the valve stem along the axial direction is connected to a valve core, and a first step is provided on the valve stem along the axial direction close to the valve core;

[0007] The sealing structure is arranged between one end of the bearing axially close to the valve core and the first step. The first step and the sealing structure are matched with each other on an inclined surface, and the sealing structure and the bearing are matched with each other on a flat surface. The first step, the sealing structure and the bearing are all located in the valve stem cavity.

[0008] Optionally, the first step is provided with a first inclined surface, and the sealing structure is provided with a second inclined surface, and the first inclined surface and the second inclined surface are in contact with each other along the radial direction close to one end of the valve stem.

[0009] Optionally, an included angle between the first inclined surface and the valve stem is α, an included angle between the second inclined surface and the valve stem is β, α<β, and there is a gap between the first inclined surface and the second inclined surface.

[0010] Optionally, the sealing structure is made of flexible graphite material.

[0011] Optionally, when the valve core is in a high-pressure condition, the first step squeezes the sealing structure, and the sealing structure deforms to fill the gap.

[0012] Optionally, a mounting groove is provided at one end of the valve body axially away from the valve core, and a valve cover is provided in the mounting groove.

[0013] Optionally, the mounting groove is provided with a first limiting portion and a second limiting portion in sequence along the axial direction away from the valve core, and the valve cover is provided with a first matching portion and a second matching portion corresponding to the first limiting portion and the second limiting portion, and the first matching portion abuts against one end of the bearing along the axial direction away from the valve core.

[0014] Optionally, the first matching portion is provided with a first sealing groove radially close to the valve stem, the valve stem is provided with a second step axially away from the valve core, and a first sealing ring is provided between the first sealing groove and the second step.

[0015] Optionally, the second matching portion is provided with a second sealing groove radially away from the valve stem, and a second sealing ring is provided between the second sealing groove and the second limiting portion.

[0016] Optionally, the valve cover and the valve body are connected by bolts.

[0017] As described above, the utility model has the following beneficial effects: by arranging a bearing between the valve stem and the valve stem cavity, the friction between the valve stem and the valve body can be effectively reduced, wear can be reduced, the service life can be extended, the stability and sealing performance of the valve can be improved, and support and guiding functions can be provided for the valve stem; by arranging a first step on the valve stem, a sealing structure is arranged between the bearing and the first step, and the sealing structure cooperates with the inclined surface of the first step. When the valve is under high-pressure conditions, the valve stem will tend to move upward under the action of the internal pressure. Due to the cooperation between the first step and the inclined surface of the sealing structure, under the action of the internal pressure, the valve stem and the sealing structure will achieve the purpose of becoming tighter and tighter as the pressure increases, effectively ensuring that the medium in the valve cavity will not penetrate into the bearing cavity, causing strain on the bearing and the valve stem, thereby effectively increasing the service life of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a schematic diagram of a self-tightening valve stem dust-proof structure shown in an embodiment of the present application;

[0019] Figure 2 Display as Figure 1 A magnified schematic diagram of the structure of the middle A section;

[0020] Figure 3 Display as Figure 1 Schematic diagram of the structure of the middle valve stem;

[0021] Figure 4 Display as Figure 1 Schematic diagram of the structure of the middle valve cover.

[0022] Description of Reference Numerals

[0023] Valve body 1, mounting groove 101, first limiting portion 101a, second limiting portion 101b, bearing 2, valve stem 3, first step 301, first inclined surface 301a, second step 302, valve core 4, sealing structure 5, second inclined surface 501, gap 6, valve cover 7, first matching portion 701, first sealing groove 701a, second matching portion 702, second sealing groove 702a, first sealing ring 8, second sealing ring 9, bolt 10. DETAILED DESCRIPTION

[0024] The following is an explanation of the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0025] See also Figures 1 to 4 . It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the utility model in a schematic manner, so the diagram only shows the components related to the utility model rather than being drawn according to the number, shape and size of the components during actual implementation. During actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated. The structure, proportion, size, etc. illustrated in the drawings attached to this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the restrictive conditions for the implementation of the utility model, so they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the utility model without affecting the effect and purpose that can be achieved by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the present utility model. Changes or adjustments to their relative relationships should be regarded as the scope of the implementation of the present utility model without substantially changing the technical content.

[0026] Before describing the embodiments of the utility model in detail, the application environment of the utility model is described first. The technology of the utility model is mainly applied to the field of valve technology. The utility model is used to solve the problem that the existing valve dustproof design is prone to seal failure under high pressure conditions, causing medium particles to enter the valve stem cavity, causing the valve stem to be strained, and then causing the valve life to be reduced.

[0027] Please combine Figures 1 to 4 As shown, the utility model provides a self-tightening valve stem dust-proof structure, comprising:

[0028] In an exemplary embodiment of the present application, a valve body 1 is provided with a valve stem 3 cavity, and a bearing 2 is provided in the valve stem 3 cavity; the valve stem 3 is inserted into the bearing 2, and one end of the valve stem 3 along the axial direction is connected to the valve core 4, and the valve stem 3 is provided with a first step 301 axially close to the valve core 4; the sealing structure 5 is arranged between the end of the bearing 2 along the axial direction close to the valve core 4 and the first step 301, the first step 301 and the sealing structure 5 are matched with an inclined surface, and the sealing structure 5 and the bearing 2 are matched with a plane, and the first step 301, the sealing structure 5 and the bearing 2 are all located in the valve stem 3 cavity.

[0029] In this embodiment, by arranging a bearing 2 between the valve stem 3 and the valve stem 3 cavity, the friction between the valve stem 3 and the valve body 1 can be effectively reduced, the wear can be reduced, the service life can be extended, the stability and sealing performance of the valve can be improved, and the valve stem 3 can be provided with support and guidance; by arranging a first step 301 on the valve stem 3, a sealing structure 5 is arranged between the bearing 2 and the first step 301, and the sealing structure 5 cooperates with the inclined surface of the first step 301, when the valve is in a high-pressure working condition, the valve stem 3 will have a tendency to move upward under the action of the internal pressure. Due to the cooperation between the inclined surface of the first step 301 and the sealing structure 5, under the action of the internal pressure, the valve stem 3 and the sealing structure 5 will achieve the purpose of becoming tighter and tighter as the pressure increases, effectively ensuring that the medium in the valve cavity will not penetrate into the bearing 2 cavity, causing the bearing 2 and the valve stem 3 to be strained, thereby effectively increasing the service life of the valve.

[0030] In an exemplary embodiment of the present application, the first step 301 is provided with a first inclined surface 301 a , and the sealing structure 5 is provided with a second inclined surface 501 . The first inclined surface 301 a and the second inclined surface 501 are in contact with each other along the radial direction close to one end of the valve stem 3 .

[0031] In this embodiment, when the valve is in a low-pressure working condition, the first bevel 301a contacts one end of the valve stem 3 along the radial direction of the valve stem 3 with the second bevel 501 contact one end of the valve stem 3 along the radial direction of the valve stem 3, and there is no contact at other positions. A deformation gap 6 is reserved between the first bevel 301a, the second bevel 501 and the cavity of the valve stem 3 for the first step 301 to squeeze the sealing structure 5 to deform and extend under high-pressure working conditions, so that the sealing structure 5 can achieve a good sealing effect under low-pressure / high-pressure working conditions, and the greater the pressure, the better the sealing effect.

[0032] In an exemplary embodiment of the present application, the angle between the first inclined surface 301 a and the valve stem 3 is α, the angle between the second inclined surface 501 and the valve stem 3 is β, α<β, and there is a gap 6 between the first inclined surface 301 a and the second inclined surface 501 .

[0033] In this embodiment, the angle α and the angle β are both acute angles. Under low pressure conditions, α<β, and under high pressure conditions, α=β.

[0034] In an exemplary embodiment of the present application, the sealing structure 5 is made of flexible graphite material.

[0035] In this embodiment, the sealing structure 5 is made of flexible graphite, so that when the valve is under high pressure, the sealing structure 5 can be squeezed and deformed by the first step 301, thereby achieving the purpose of tightening with pressure.

[0036] In an exemplary embodiment of the present application, when the valve core 4 is in a high-pressure condition, the first step 301 squeezes the sealing structure 5 , and the sealing structure 5 is deformed to fill the gap 6 .

[0037] In an exemplary embodiment of the present application, a mounting groove 101 is provided at one end of the valve body 1 axially away from the valve core 4 , and a valve cover 7 is provided in the mounting groove 101 .

[0038] In this embodiment, the valve cover 7 can effectively prevent the external medium of the valve from entering the valve.

[0039] In an exemplary embodiment of the present application, the mounting groove 101 is provided with a first limiting portion 101a and a second limiting portion 101b in sequence along the axial direction away from the valve core 4, and the valve cover 7 is provided with a first matching portion 701 and a second matching portion 702 corresponding to the first limiting portion 101a and the second limiting portion 101b, and the first matching portion 701 abuts against one end of the bearing 2 along the axial direction away from the valve core 4.

[0040] In this embodiment, the valve cover 7 cooperates with the first limiting portion 101a and the second limiting portion 101b provided on the valve body 1 through the first matching portion 701 and the second matching portion 702, thereby realizing rapid positioning and installation of the valve cover 7 and the valve body 1.

[0041] In an exemplary embodiment of the present application, the first matching portion 701 is provided with a first sealing groove 701a radially close to the valve stem 3, the valve stem 3 is provided with a second step 302 axially away from the valve core 4, and a first sealing ring 8 is provided between the first sealing groove 701a and the second step 302.

[0042] In this embodiment, the first matching portion 701 abuts against the bearing 2, and the first sealing ring 8 is used to prevent the external medium of the valve from entering between the valve stem 3 and the bearing 2, and prevent the medium between the valve stem 3 and the bearing 2 from entering between the valve cover 7 and the valve body 1.

[0043] In an exemplary embodiment of the present application, the second matching portion 702 is provided with a second sealing groove 702a radially away from the valve stem 3, and a second sealing ring 9 is provided between the second sealing groove 702a and the second limiting portion 101b.

[0044] In this embodiment, the second sealing ring 9 is used to seal the second matching portion 702 and the second limiting portion 101 b.

[0045] In an exemplary embodiment of the present application, the valve cover 7 and the valve body 1 are connected by bolts 10 .

[0046] Working principle: by arranging the bearing 2 between the valve stem 3 and the valve stem 3 cavity, the friction between the valve stem 3 and the valve body 1 can be effectively reduced, the wear can be reduced, the service life can be extended, the stability and sealing performance of the valve can be improved, and the valve stem 3 can be provided with support and guidance; by arranging the first step 301 on the valve stem 3, a sealing structure 5 is arranged between the bearing 2 and the first step 301, and the sealing structure 5 cooperates with the inclined surface of the first step 301. When the valve is in a high-pressure working condition, the valve stem 3 will tend to move upward under the action of the internal pressure. Due to the cooperation between the inclined surface of the first step 301 and the sealing structure 5, under the action of the internal pressure, the valve stem 3 and the sealing structure 5 will achieve the purpose of becoming tighter and tighter as the pressure increases, effectively ensuring that the medium in the valve cavity will not penetrate into the bearing 2 cavity, causing the bearing 2 and the valve stem 3 to be strained, thereby effectively increasing the service life of the valve.

[0047] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A self-tightening valve stem dust-proof structure, characterized in that: include: A valve body, wherein a valve stem cavity is provided on the valve body, and a bearing is provided in the valve stem cavity; A valve stem is inserted into the bearing, one end of the valve stem along the axial direction is connected to a valve core, and a first step is provided on the valve stem along the axial direction close to the valve core; The sealing structure is arranged between one end of the bearing axially close to the valve core and the first step. The first step and the sealing structure are matched with each other on an inclined surface, and the sealing structure and the bearing are matched with each other on a flat surface. The first step, the sealing structure and the bearing are all located in the valve stem cavity.

2. The self-tightening valve stem dust-proof structure according to claim 1 is characterized in that: The first step is provided with a first inclined surface, and the sealing structure is provided with a second inclined surface. The first inclined surface and the second inclined surface are in contact with each other along the radial direction close to one end of the valve stem.

3. The self-tightening valve stem dust-proof structure according to claim 2 is characterized in that: The included angle between the first inclined surface and the valve stem is α, the included angle between the second inclined surface and the valve stem is β, α<β, and there is a gap between the first inclined surface and the second inclined surface.

4. The self-tightening valve stem dust-proof structure according to claim 3 is characterized in that: The sealing structure is made of flexible graphite material.

5. The self-tightening valve stem dust-proof structure according to claim 4 is characterized in that: When the valve core is in a high-pressure condition, the first step squeezes the sealing structure, and the sealing structure deforms to fill the gap.

6. The self-tightening valve stem dust-proof structure according to claim 1 is characterized in that: An installation groove is provided at one end of the valve body away from the valve core in the axial direction, and a valve cover is provided in the installation groove.

7. The self-tightening valve stem dust-proof structure according to claim 6 is characterized in that: The mounting groove is provided with a first limiting portion and a second limiting portion in sequence along the axial direction away from the valve core, and the valve cover is provided with a first matching portion and a second matching portion corresponding to the first limiting portion and the second limiting portion, and the first matching portion abuts against one end of the bearing along the axial direction away from the valve core.

8. The self-tightening valve stem dust-proof structure according to claim 7 is characterized in that: The first matching portion is provided with a first sealing groove radially close to the valve stem, the valve stem is provided with a second step axially away from the valve core, and a first sealing ring is provided between the first sealing groove and the second step.

9. The self-tightening valve stem dust-proof structure according to claim 8, characterized in that: The second matching portion is provided with a second sealing groove radially away from the valve stem, and a second sealing ring is provided between the second sealing groove and the second limiting portion.

10. The self-tightening valve stem dust-proof structure according to claim 9, characterized in that: The valve cover is connected to the valve body via bolts.

Images