Valve rod anti-shaking sealing structure of ball valve

Abstract

The utility model discloses an anti-shaking sealing structure for a valve rod of a ball valve, which comprises an upper L-shaped sleeve and a lower L-shaped sleeve which are respectively sleeved on the upper section part and the lower section part of the valve rod and have L-shaped cross sections, and the valve rod is surrounded by the upper L-shaped sleeve and the lower L-shaped sleeve so as to be prevented from shaking. The lower L-shaped sleeve is made of metal, an annular protruding shoulder is arranged on the lower section portion of the valve rod, a circle of pressing portion with an L-shaped cross section is arranged on the inner wall of an installation channel, used for installing the valve rod, of the valve body, the valve rod is installed in the installation channel of the valve body in a penetrating mode, and the lower L-shaped sleeve is pressed between the annular protruding shoulder of the valve rod and the pressing portion in the installation channel. When the valve rod rotates relative to the lower L-shaped sleeve, friction acts on the lower L-shaped sleeve, the lower L-shaped sleeve is made of metal and has high abrasion resistance, and compared with a plastic gasket, the lower L-shaped sleeve made of metal cannot generate gaps due to long-term abrasion.

Description

Technical Field

[0001] The utility model relates to the field of ball valves, in particular to an anti-sway sealing structure for the valve stem of a ball valve. Background Art

[0002] The ball valve is one of the valves with relatively wide applications. It has a simple structure, reliable sealing, and convenient maintenance, and is widely used in fields such as petroleum, chemical industry, metallurgy, light textile, food, atomic energy, and aviation. The plug body is a spherical valve core, which is mainly used to cut off, distribute, and change the flow direction of the medium in the pipeline. It is necessary to drive the plug body to rotate through the valve stem to conduct or cut off the pipeline.

[0003] A ball valve usually includes a valve body, a valve core, a valve stem structure, and a valve cover. The valve core is arranged in the valve cavity of the valve body and is linked with the valve stem structure. The sealing performance between the valve stem structure and the valve body directly affects the service life of the ball valve. In the existing valve stem structure, the sealing effect is achieved by pressing the packing and the sealing ring, and the packing and the sealing ring are used to fit the installation channel of the valve body so that the valve stem is rotatably connected to the valve body. However, the packing and the sealing ring are only located on a small section of the valve stem. And due to the long-term rotation of the valve stem structure, the packing and the sealing ring are easily worn and generate gaps, which will cause the valve stem to tilt and sway in the central axis and affect the sealing effect, ultimately affecting the normal use of the ball valve.

[0004] Therefore, how to realize a valve stem installation structure that is simple, practical, can prevent the valve stem from tilting and swaying, and has a good sealing effect is a technical problem that the industry urgently needs to solve. Summary of the Utility Model

[0005] The main purpose of the utility model is to provide an anti-sway sealing structure for the valve stem of a ball valve, aiming to achieve a tight connection between the valve stem and the valve body, a stable position of the valve stem, strong sealing performance, and easy rotation.

[0006] The utility model provides an anti-sway sealing structure for the valve stem of a ball valve, which includes an upper L-shaped sleeve and a lower L-shaped sleeve with an L-shaped cross-section respectively sleeved on the upper section and the lower section of the valve stem. The lower L-shaped sleeve is made of metal and includes a vertically arranged lower vertical ring and a horizontally arranged lower horizontal ring. The lower vertical ring and the lower horizontal ring are vertically connected, and a plastic sealing sheet is embedded on the upper end surface of the lower horizontal ring;

[0007] An annular shoulder is arranged on the lower section of the valve stem, and an L-shaped pressing part with an L-shaped cross-section is arranged on the inner wall of the installation channel of the valve body for installing the valve stem. The valve stem is installed through the installation channel of the valve body, and the lower L-shaped sleeve is pressed between the annular shoulder and the pressing part;

[0008] The vertical surface of the pressing portion is in contact with the outer side surface of the lower vertical ring, the outer wall surface of the valve stem is in contact with the inner side surface of the lower vertical ring, the horizontal surface of the pressing portion presses tightly on the upper end surface of the lower horizontal ring, the plastic sealing sheet is pressed tightly between the horizontal surface of the pressing portion and the lower horizontal ring, and the lower end surface of the lower horizontal ring presses tightly on the annular shoulder.

[0009] Preferably, a convex ring is provided around the outer wall of the valve stem. The convex ring is vertically located on the upper end surface of the shoulder. The inner side surface of the lower vertical ring is in contact with the convex ring. An annular groove is provided at a position of the convex ring above the lower vertical ring, and a sealing ring is installed in the annular groove.

[0010] A sealing wall is protruded at a position above the pressing portion on the inner wall of the installation channel. The sealing wall abuts against the upper part of the lower vertical ring and is in relative contact with the sealing ring.

[0011] Preferably, an annular guide groove is recessed on the upper end surface of the annular shoulder, and an annular guide ring adapted to the annular guide groove is protruded on the lower end surface of the lower horizontal ring. The annular guide ring is placed in the annular guide groove.

[0012] Preferably, the upper L-shaped sleeve is made of metal.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] The valve stem anti-sway sealing structure proposed by the present utility model includes an upper L-shaped sleeve and a lower L-shaped sleeve with an L-shaped cross-section respectively sleeved on the upper section and the lower section of the valve stem. The valve stem is enclosed by the upper L-shaped sleeve and the lower L-shaped sleeve to prevent the valve stem from swaying.

[0015] The lower L-shaped sleeve is made of metal. An annular shoulder is provided on the lower section of the valve stem. The inner wall of the installation channel of the valve body for installing the valve stem is provided with a pressing portion with an L-shaped cross-section. The valve stem is installed through the installation channel of the valve body. The lower L-shaped sleeve is pressed between the annular shoulder of the valve stem and the pressing portion in the installation channel. When the valve stem rotates relative to the lower L-shaped sleeve, the friction acts on the lower L-shaped sleeve. The lower L-shaped sleeve is made of metal and has high wear resistance. Compared with the plastic gasket, the metal lower L-shaped sleeve will not generate gaps due to long-term wear.

[0016] A plastic sealing sheet is embedded on the upper end surface of the lower horizontal ring of the lower L-shaped sleeve. The plastic sealing sheet is pressed tightly between the horizontal surface of the pressing portion and the lower horizontal ring. The lower end surface of the lower horizontal ring presses tightly on the annular shoulder, enhancing the sealing performance between the lower L-shaped sleeve and the pressing portion in the installation channel. Through the plastic sealing sheet, the lower L-shaped sleeve is more closely attached to the pressing portion, with a tight connection and enhanced sealing performance. Description of the Drawings

[0017] Figure 1 This is a cross-sectional view of the anti-sway seal structure of the valve stem of the ball valve of the present utility model.

[0018] Figure 2 This is a schematic diagram of the valve stem structure of the ball valve of the present utility model.

[0019] Figure 3 This is an exploded schematic diagram of the valve stem structure of the ball valve of the present utility model.

[0020] The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0021] The following details the embodiments of the present utility model. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals identify the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present utility model and should not be construed as limiting the present utility model.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and not to describe a specific order.

[0023] Referring to "embodiment" herein means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0024] Refer to Figures 1 to 3, an embodiment of the utility model provides a valve stem anti-sway sealing structure for a ball valve, which includes an upper L-shaped sleeve 2 and a lower L-shaped sleeve 3 with an L-shaped cross-section respectively sleeved on the upper section and the lower section of the valve stem 1. The upper L-shaped sleeve 2 includes an upper vertical ring 22 arranged vertically and an upper horizontal ring 21 arranged horizontally, and the upper vertical ring 22 and the upper horizontal ring 21 are perpendicularly connected. The lower L-shaped sleeve 3 includes a lower vertical ring 32 arranged vertically and a lower horizontal ring 31 arranged horizontally, and the lower vertical ring 32 and the lower horizontal ring 31 are perpendicularly connected. An annular shoulder 11 is provided on the lower section of the valve stem 1, and the inner wall of the installation channel of the valve body for installing the valve stem 1 is provided with a pressing part and a lapping part with an L-shaped cross-section, and the lapping part is located at the upper end position of the installation channel. The valve stem 1 is installed through the installation channel of the valve body, the upper horizontal ring 21 of the upper L-shaped sleeve 2 is lapped on the lapping part, and a positioning lock piece is pressed on the upper end of the upper horizontal ring 21, and the upper horizontal ring 21 is pressed and fixed on the lapping part through the positioning lock piece. The lower L-shaped sleeve 3 is pressed between the annular shoulder 11 and the pressing part, the vertical surface of the pressing part is attached to the outer side surface of the lower vertical ring 32, the outer wall surface of the valve stem 1 is attached to the inner side surface of the lower vertical ring 32, the horizontal surface of the pressing part tightly presses on the upper end surface of the lower horizontal ring 31, and the lower end surface of the lower horizontal ring 31 tightly presses on the annular shoulder 11. The valve stem 1 is surrounded by the upper L-shaped sleeve 2 and the lower L-shaped sleeve 3 to prevent the valve stem 1 from swaying.

[0025] When the valve stem 1 rotates relative to the upper L-shaped sleeve 2 and the lower L-shaped sleeve 3, frictional forces act on the upper L-shaped sleeve 2 and the lower L-shaped sleeve 3. The upper L-shaped sleeve 2 is made of metal material, and the lower L-shaped sleeve 3 is made of metal material, with high strength and wear resistance, and no gaps will be generated due to long-term wear.

[0026] A plastic sealing sheet 33 is embedded on the upper end surface of the lower horizontal ring 31 of the lower L-shaped sleeve 3. The plastic sealing sheet 33 is tightly pressed between the horizontal surface of the pressing part and the lower horizontal ring 31, and the lower end surface of the lower horizontal ring 31 is tightly pressed on the annular shoulder 11, enhancing the sealing performance between the lower L-shaped sleeve 3 and the pressing part in the installation channel. Through the plastic sealing sheet 33, the lower L-shaped sleeve 3 is more closely attached to the pressing part, with a tight connection and enhanced sealing performance.

[0027] A convex ring 12 is provided around the outer wall of the valve stem 1. The convex ring 12 is vertically located on the upper end surface of the shoulder 11, and the inner side surface of the lower vertical ring 32 is attached to the convex ring 12. The convex ring 12 is provided to enhance the structural strength of the valve stem 1. An annular groove 13 is provided at the position of the convex ring 12 above the lower vertical ring 32, and a sealing ring 4 is installed in the annular groove 13. A sealing wall is protruded at the position above the pressing part on the inner wall of the installation channel. The sealing wall abuts above the lower vertical ring 32 and is relatively closely attached to the sealing ring 4, enhancing the sealing performance between the valve stem 1 and the installation channel.

[0028] In another preferred embodiment, an annular guide groove is recessed in the upper end surface of the annular shoulder, and an annular guide ring adapted to the annular guide groove is protruded from the lower end surface of the lower horizontal ring. The annular guide ring is placed in the annular guide groove, which is beneficial to the relative rotation of the valve stem with respect to the lower L-shaped sleeve.

[0029] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the protection scope of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still, without conflict, make combinations, additions, deletions or other adjustments to the features in the embodiments of the present invention according to the situation without making creative efforts, so as to obtain different technical solutions that essentially do not depart from the concept of the present invention, and these technical solutions also belong to the scope of protection of the present invention.

Claims

1. A valve stem anti-sway sealing structure for a ball valve, characterized in that, It includes an upper L-shaped sleeve and a lower L-shaped sleeve with an L-shaped cross-section respectively sleeved on the upper section and the lower section of the valve stem. The lower L-shaped sleeve is made of metal and includes a lower vertical ring arranged vertically and a lower horizontal ring arranged horizontally. The lower vertical ring and the lower horizontal ring are perpendicularly connected, and a plastic sealing sheet is embedded in the upper end surface of the lower horizontal ring. An annular shoulder is provided on the lower section of the valve stem. An L-shaped pressing portion with an L-shaped cross-section is provided on the inner wall of the installation passage of the valve body for installing the valve stem. The valve stem is installed through the installation passage of the valve body, and the lower L-shaped sleeve is pressed between the annular shoulder and the pressing portion. The vertical surface of the pressing portion is attached to the outer side surface of the lower vertical ring, the outer wall surface of the valve stem is attached to the inner side surface of the lower vertical ring, the horizontal surface of the pressing portion tightly presses on the upper end surface of the lower horizontal ring, the plastic sealing sheet is tightly pressed between the horizontal surface of the pressing portion and the lower horizontal ring, and the lower end surface of the lower horizontal ring tightly presses on the annular shoulder.

2. The anti-sway sealing structure of the valve stem of the ball valve according to claim 1, characterized in that, A convex ring is provided around the outer wall of the valve stem. The convex ring is vertically located on the upper end surface of the shoulder. The inner side surface of the lower vertical ring is attached to the convex ring. An annular groove is provided at the position of the convex ring above the lower vertical ring, and a sealing ring is installed in the annular groove. A sealing wall is protruded at the position above the pressing portion on the inner wall of the installation passage. The sealing wall abuts above the lower vertical ring and is relatively attached to the sealing ring.

3. The anti-sway seal structure of the valve stem of the ball valve according to claim 2, characterized in that, An annular guiding groove is recessed on the upper end surface of the annular shoulder. An annular guiding ring adapted to the annular guiding groove is protruded on the lower end surface of the lower horizontal ring. The annular guiding ring is placed in the annular guiding groove.

4. The anti-vibration sealing structure of the valve stem of the ball valve according to claim 1 or 2 or 3, characterized in that, The upper L-shaped sleeve is made of metal.

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