Valve rod anti-flying structure

Abstract

The utility model relates to a valve rod anti -fly structure, include: valve rod, be provided with the joint groove on the end of valve rod, boss snap ring, the boss snap ring includes snap ring body, the snap ring body has through -hole, the through -hole is along the axial penetration of snap ring body in the snap ring body, be provided with first limit lug, second limit lug on the snap ring body, the end of valve rod passes through the through -hole of the snap ring body of boss snap ring's snap ring body, thus make the snap ring body of boss snap ring enter into the joint groove, and rotate boss snap ring preset angle, make first limit lug with second limit lug joint into the joint groove, thereby make valve rod with boss snap ring detachable connection together.

Description

Technical Field

[0001] This utility model relates to the field of valves, specifically to a valve stem anti-flying structure. Background Technology

[0002] Rotary valves open and close by rotating a ball. Due to their simple, convenient, and quick operation, they are widely used in industrial production pipelines in chemical, petroleum, metallurgical, power, pharmaceutical, and energy industries. During operation, the rotation of the ball relies on the valve stem. The valve stem, as the connecting part between the ball and the actuator, is in contact with both the medium and the external environment. Therefore, the valve stem, as a connecting component, must meet certain structural requirements. Primarily, during valve operation, the valve stem must not detach from the valve body due to pressure.

[0003] Currently, most rotary valves on the market have relatively short stems. The anti-flyaway mechanism involves an internal step in the valve body, with the stem installed from the bottom (from inside the valve body). This step prevents the stem from moving outward. This necessitates a bottom-mounted stem, requiring a short stem and a shallow stuffing box. This makes leakage at the packing area more likely, and this structure is unsuitable for applications requiring double packing.

[0004] Some manufacturers also prevent the valve stem from flying out of the valve body by installing parts at the joint between the stuffing box and the stuffing plate. However, this also poses a safety hazard. When disassembling the valve, if the internal pressure is not released or is not released completely, the valve stem may fly out. Some manufacturers even omit the anti-flying feature altogether to save costs, which is very dangerous. Summary of the Invention

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a valve stem anti-flying structure.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a valve stem anti-flying structure, comprising: A valve stem, wherein a snap-fit ​​groove is provided on the end of the valve stem; A boss retaining ring includes a retaining ring body with a through hole extending through the retaining ring body along its axial direction. The retaining ring body is provided with a first limiting protrusion and a second limiting protrusion. The end of the valve stem passes through the through hole of the retaining ring body, thereby allowing the retaining ring body to extend into the engaging groove. By rotating the boss retaining ring at a preset angle, the first and second limiting protrusions engage with the engaging groove, thus enabling the valve stem to be detachably connected to the boss retaining ring.

[0007] Preferably, the first limiting protrusion protrudes radially from the inner wall of the through hole of the retaining ring body for a predetermined length, and the second limiting protrusion protrudes radially from the inner wall of the through hole of the retaining ring body for a predetermined length, and the first limiting protrusion and the second limiting protrusion are arranged opposite to each other.

[0008] Preferably, the valve stem is provided with a first limiting part and a second limiting part at its end. The first limiting part and the second limiting part are close to the locking groove of the valve stem. When the locking ring body of the boss retaining ring extends into the locking groove and rotates at a preset angle, the first limiting part abuts against the first limiting protrusion, and the second limiting part abuts against the second limiting protrusion, thereby preventing the boss retaining ring from disengaging from the valve stem.

[0009] Preferably, the valve stem end is provided with a first straight cutting plane and a second straight cutting plane, the first straight cutting plane and the second straight cutting plane being symmetrical about the valve stem axis of symmetry; and when the retaining ring body of the boss retaining ring is installed on the end of the valve stem, the outer surface of the first limiting protrusion near the through hole is parallel to the first straight cutting plane, and the outer surface of the second limiting protrusion near the through hole is parallel to the second straight cutting plane, so that the retaining ring body of the boss retaining ring extends into the retaining groove.

[0010] Preferably, the boss retaining ring further includes a first lug and a second lug, the retaining ring body has a first end face, the first lug and the second lug both extend outward from the first end face of the retaining ring body by a predetermined length, and the first lug and the second lug both extend along the axial direction of the retaining ring body.

[0011] Preferably, the first lug has a first arcuate surface, the second lug has a second arcuate surface, and the first arcuate surface and the second arcuate surface are close to the axis of symmetry of the retaining ring body.

[0012] The beneficial effects of this application are as follows: This utility model provides an anti-flying valve stem structure, which includes a valve stem and a boss retaining ring. The valve stem and the boss retaining ring can be combined with the valve stem by rotating the retaining ring 90 degrees without falling off. The valve stem is located in the inner cavity of the valve body and has an upward movement stroke in the inner cavity. After the valve stem moves upward a certain distance, the boss retaining ring contacts the valve body under the action of the valve stem, and the valve body prevents the boss retaining ring and the valve stem from moving upward. The valve stem provided by this utility model is installed into the inner cavity from the upper part of the valve body, and there are no requirements for the length of the valve stem and the depth of the stuffing box. The inner hole of the boss retaining ring is designed with a step, and it can be connected with the valve stem by simply rotating the retaining ring. This structure is simple to form and easy to assemble. Attached Figure Description

[0013] Figure 1 A schematic diagram of a ball valve with a stem anti-fly-off structure provided by this utility model.

[0014] Figure 2 This utility model provides a schematic diagram of the valve stem structure for an anti-flying valve stem structure.

[0015] Figure 3 Another structural schematic diagram of a valve stem for an anti-flying valve stem structure provided by this utility model.

[0016] Figure 4 A schematic diagram of the boss retaining ring of the valve stem anti-flying structure provided by this utility model.

[0017] Figure 5 Another schematic diagram of the boss retaining ring of the valve stem anti-flying structure provided by this utility model. Detailed Implementation

[0018] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0019] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operational steps involved in each embodiment can also be rearranged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a particular embodiment and do not imply that they represent the necessary components and / or order.

[0020] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0021] Please refer to Figure 1-5 This application provides a valve stem anti-flyaway structure, which includes: Valve stem 11, wherein a snap-fit ​​groove 1101 is provided on the end 110 of the valve stem 11; The protruding retaining ring 12 includes a retaining ring body 121 with a through hole 1210 extending along the axial direction of the retaining ring body 121. The retaining ring body 121 is provided with a first limiting protrusion 122 and a second limiting protrusion 123. The end 110 of the valve stem 11 passes through the through hole 1210 of the retaining ring body 121, thereby allowing the retaining ring body 121 of the protruding retaining ring 12 to extend into the engaging groove 1101. By rotating the protruding retaining ring 12 at a preset angle, the first limiting protrusion 122 and the second limiting protrusion 123 are engaged in the engaging groove 1101, thus allowing the valve stem 11 to be detachably connected to the protruding retaining ring 12. In this application, those skilled in the art should understand that although this application does not specifically address the issue of the diameter of the two components when they are installed or plugged together, these are common technical knowledge for those skilled in the art. For example, when the end 110 of the valve stem 11 passes through the through hole 1210, it is obvious that the diameter of the end 110 of the valve stem 11 is smaller than the inner diameter of the through hole 1210, and not the other way around.

[0022] In some embodiments of this application, please refer to Figure 1-5 The first limiting protrusion 122 protrudes radially from the inner wall of the through hole 1210 of the retaining ring body 121 by a predetermined length, and the second limiting protrusion 123 protrudes radially from the inner wall of the through hole 1210 of the retaining ring body 121 by a predetermined length, with the first limiting protrusion 122 and the second limiting protrusion 123 being disposed opposite to each other. In this application, the first limiting protrusion 122 and the second limiting protrusion 123 can be disposed on the retaining ring body 121 by welding or integral molding with the retaining ring body 121. Preferably, the first limiting protrusion 122 and the second limiting protrusion 123 are integrally molded with the retaining ring body 121. Of course, other connection methods can also be used, such as fixing the first limiting protrusion 122 and the second limiting protrusion 123 to the retaining ring body 121 together by bolts or screws.

[0023] In some embodiments of this application, please refer to Figure 1-5The valve stem 11 has a first limiting part 1102 and a second limiting part 1103 on its end 110. The first limiting part 1102 and the second limiting part 1103 are close to the locking groove 1101 of the valve stem 11. When the locking ring body 121 of the boss locking ring 12 extends into the locking groove 1101 and rotates at a preset angle, the first limiting part 1102 abuts against the first limiting protrusion 122, and the second limiting part 1102 abuts against the second limiting protrusion 123, thereby preventing the boss locking ring 12 from disengaging from the valve stem 11. Similarly, rotate the boss retaining ring 12 in the opposite direction by a preset angle. At this time, the first limiting part 1102 is not in contact with the first limiting protrusion 122, and the second limiting part 1103 is not in contact with the second limiting protrusion 123. Then pull the boss retaining ring 12 to disengage the boss retaining ring 12 from the retaining groove 1101, thereby disengaging the boss retaining ring 12 from the valve stem 11.

[0024] In some embodiments of this application, please refer to Figure 1-5 The valve stem 11 has a first straight cutting plane 1104 and a second straight cutting plane 1105 on its end 110. The first straight cutting plane 1104 and the second straight cutting plane 1105 are symmetrical about the axis of symmetry of the valve stem 11. When the retaining ring body 121 of the boss retaining ring 12 is installed on the end 110 of the valve stem 11, the outer surface of the first limiting protrusion 122 near the through hole 1210 is parallel to the first straight cutting plane 1104, and the outer surface of the second limiting protrusion 123 near the through hole 1210 is parallel to the second straight cutting plane 1105, so that the retaining ring body 121 of the boss retaining ring 12 extends into the retaining groove 1101. During installation, firstly, the first straight cutting plane 1104 of the end 110 of the valve stem 11 is parallel to the outer surface of the first limiting protrusion 122 of the retaining ring body 121, and the second straight cutting plane 1104 is parallel to the outer surface of the second limiting protrusion 122. Then, the end 110 of the valve stem 11 is inserted into the through hole 1210. Then, the retaining ring body 121 is rotated so that the first limiting protrusion 122 and the second limiting protrusion 123 are located in the retaining groove 1101, and the first limiting protrusion 122 abuts against the first limiting part 1102, and the second limiting protrusion 123 abuts against the second limiting part 1102, so that the protrusion retaining ring 12 is firmly installed on the valve stem 11.

[0025] In some embodiments of this application, please refer to Figure 1-5The protruding retaining ring 12 further includes a first lug 124 and a second lug 125. The retaining ring body 121 has a first end face 1211. The first lug 124 and the second lug 125 both extend outward from the first end face 1211 of the retaining ring body 121 by a predetermined length, and both extend along the axial direction of the retaining ring body 121. In this application, the first lug 124, the second lug 125, and the retaining ring body 121 are integrally formed. Of course, the three can also be connected by other connection methods, such as welding the first lug 124 and the second lug 125 to the retaining ring body 121.

[0026] In some embodiments of this application, please refer to Figure 1-5 The first lug 124 has a first arcuate surface 1240, and the second lug 125 has a second arcuate surface 1250, with the first arcuate surface 1240 and the second arcuate surface 1250 close to the axis of symmetry of the retaining ring body 121. In this application, when the valve stem anti-flyaway structure is installed on a ball valve, the first arcuate surface 1240 of the first lug 124 and the second arcuate surface 1250 of the second lug 125 are in contact with the ball valve.

[0027] This utility model provides an anti-flying valve stem structure, which includes a valve stem and a boss retaining ring. The valve stem and the boss retaining ring can be combined with the valve stem by rotating the retaining ring 90 degrees without falling off. The valve stem is located in the inner cavity of the valve body and has an upward movement stroke in the inner cavity. After the valve stem moves upward a certain distance, the boss retaining ring contacts the valve body under the action of the valve stem, and the valve body prevents the boss retaining ring and the valve stem from moving upward. The valve stem provided by this utility model is installed into the inner cavity from the top of the valve body, and there are no requirements for the length of the valve stem and the depth of the stuffing box. The inner hole of the boss retaining ring is designed with a step, and it can be connected to the valve stem by simply rotating the retaining ring. This structure is simple to form and easy to assemble.

[0028] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A valve stem anti-flying structure, characterized in that, include: A valve stem, wherein a snap-fit ​​groove is provided on the end of the valve stem; A boss retaining ring includes a retaining ring body with a through hole extending through the retaining ring body along its axial direction. The retaining ring body is provided with a first limiting protrusion and a second limiting protrusion. The end of the valve stem passes through the through hole of the retaining ring body, thereby allowing the retaining ring body to extend into the engaging groove. By rotating the boss retaining ring at a preset angle, the first and second limiting protrusions engage with the engaging groove, thus enabling the valve stem to be detachably connected to the boss retaining ring.

2. The valve stem anti-flying structure according to claim 1, characterized in that, The first limiting protrusion protrudes radially from the inner wall of the through hole of the retaining ring body for a predetermined length, and the second limiting protrusion protrudes radially from the inner wall of the through hole of the retaining ring body for a predetermined length, and the first limiting protrusion and the second limiting protrusion are arranged opposite to each other.

3. The valve stem anti-flying structure according to claim 1, characterized in that, The valve stem is provided with a first limiting part and a second limiting part at its end. The first limiting part and the second limiting part are close to the locking groove of the valve stem. When the locking ring body of the boss locking ring extends into the locking groove and rotates at a preset angle, the first limiting part and the first limiting protrusion abut against each other, and the second limiting part and the second limiting protrusion abut against each other, thereby preventing the boss locking ring from disengaging from the valve stem.

4. The valve stem anti-flying structure according to claim 1, characterized in that, The valve stem end is provided with a first straight cutting plane and a second straight cutting plane, which are symmetrical about the valve stem axis. When the retaining ring body of the boss retaining ring is installed on the end of the valve stem, the outer surface of the first limiting protrusion near the through hole is parallel to the first straight cutting plane, and the outer surface of the second limiting protrusion near the through hole is parallel to the second straight cutting plane, so that the retaining ring body of the boss retaining ring extends into the retaining groove.

5. The valve stem anti-flying structure according to claim 1, characterized in that, The protruding retaining ring further includes a first lug and a second lug. The retaining ring body has a first end face. The first lug and the second lug both extend outward from the first end face of the retaining ring body by a predetermined length, and the first lug and the second lug both extend along the axial direction of the retaining ring body.

6. The valve stem anti-flying structure according to claim 5, characterized in that, The first lug has a first arcuate surface, the second lug has a second arcuate surface, and the first arcuate surface and the second arcuate surface are close to the axis of symmetry of the retaining ring body.

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