Anti-attrition structure for valve rod and guide valve cover in ball valve

Abstract

The utility model relates to an anti-attrition structure for a valve rod and a guide valve cover in a ball valve, which comprises the following components: a valve rod which is provided with a spiral inner groove on the peripheral wall; a guide hole is formed in the guide valve cover; the guide pin is matched with the guide hole, and a bearing is arranged at the end, located in the guide valve deck, of the guide pin. Wherein the bearing is matched with the spiral inner groove; the bearing at the end of the guide pin and the spiral inner groove are in rolling friction, abrasion generated by relative movement of the bearing and the spiral inner groove can be reduced by changing the friction mode, and valve opening and closing action abnormity and jamming are avoided.

Description

Technical Field

[0001] The utility model relates to the field of track ball valves, in particular to a friction reducing structure for a valve stem and a guide valve cover in a ball valve. Background Art

[0002] In conventional orbital ball valves, the guide pin structure adopts a threaded fixed guide pin. The guide pin and the guide valve cover are connected by a thread. The thread connection gap is large. One end of the guide pin is located in the spiral inner groove of the valve stem. After repeated transmission between the guide pin and the spiral inner groove, it will become loose or shake, or even break, affecting the opening and closing action and normal use of the valve.

[0003] In addition, the guide pins of conventional track ball valves are subject to sliding friction when moving in the spiral groove of the valve stem. After the valve is operated multiple times, the guide pins and the spiral groove of the valve stem will wear out. In severe cases, this will affect the transmission accuracy and cause abnormal valve switching and jamming.

[0004] In summary, how to reduce the wear between the guide pin and the spiral inner groove has become an urgent problem that researchers in this field need to solve. Utility Model Content

[0005] The technical problem to be solved by the utility model is: how to reduce the wear between the guide pin and the spiral inner groove;

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] The utility model is a friction reducing structure for a valve stem and a guide valve cover in a ball valve, comprising: a valve stem with a spiral inner groove formed on its outer peripheral wall; a guide valve cover with a guide hole formed thereon; and a guide pin which cooperates with the guide hole and has a bearing provided at one end thereof located in the guide valve cover; wherein the bearing cooperates with the spiral inner groove;

[0008] Compared with the traditional sliding friction between the guide pin end and the spiral inner groove, in this solution, the bearing at the guide pin end and the spiral inner groove have rolling friction. By changing the friction mode, the wear caused by the relative movement between the two can be reduced, avoiding abnormal valve switching action and jamming.

[0009] Different from the traditional threaded connection method, the guide pin and the guide hole in this solution are matched in a smooth rod and smooth hole manner, so the guide pin will not move during the movement of the valve stem, ensuring the switching action and normal use of the valve.

[0010] In order to illustrate the specific structure of the guide pin, the present invention adopts the guide pin as a T-shaped cylindrical pin with a limiting ring at the end;

[0011] In order to limit the rotation and axial movement of the guide pin in the guide hole, the utility model adopts the limit ring as an oblong structure; a cavity matching the limit ring is opened at one end of the outer side of the guide hole; a step groove is provided at the bottom of the side wall of the guide valve cover, and the guide hole is opened at the vertical wall of the step groove; the top positioning ring of the valve body and the valve cover cooperates with the step groove, and the inner wall of the positioning ring is located on the outer side of the guide hole, and the inner wall of the positioning ring is used to limit the axial movement of the guide pin out of the guide hole;

[0012] In this solution, the oblong-structured limiting ring cooperates with the cavity to limit the rotation of the guide pin and the axial movement of the guide pin close to the valve stem; the outer side of the guide hole is the inner wall of the positioning ring, which limits the axial movement of the guide pin away from the valve stem in the guide hole. In summary, the self-rotation and axial movement of the guide pin are limited.

[0013] The outer wall of the guide pin and the surface of the guide hole are both hardened by surfacing with a cobalt-based alloy; the outer surface of the guide pin and the surface of the guide hole are hardened by surfacing with a cobalt-based alloy, forming a hardened layer on the outer surface of the guide pin and the surface of the guide hole, thereby improving the hardness and strength of the mating surface. By grinding, the roughness of the mating surface of the guide pin and the guide hole is improved, the hardness can reach HRC40-45, and the roughness can reach Ra0.8, thereby preventing wear between the guide pin and the guide hole.

[0014] Beneficial effects of the utility model: The utility model is a friction-reducing structure for the valve stem and the guide valve cover in a ball valve. There is rolling friction between the bearing at the end of the guide pin and the spiral inner groove. By changing the friction mode, the wear caused by the relative movement between the two can be reduced, avoiding abnormal valve switching action and jamming. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 yes Figure 1 A magnified view of point A;

[0018] Figure 3 It is a structural diagram of the guide valve cover;

[0019] Figure 4 It is the front view and side view of the guide pin;

[0020] In the figure: 1-valve stem, 11-spiral inner groove, 2-guide valve cover, 21-guide hole, 22-step groove, 3-guide pin, 31-limiting ring, 4-bearing, 5-valve body valve cover, 51-positioning ring, 6-hardened layer. DETAILED DESCRIPTION

[0021] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0022] like Figure 1-3 As shown, the utility model is a friction-reducing structure for a valve stem and a guide valve cover in a ball valve, comprising: a valve stem 1, on the outer peripheral wall of which a spiral inner groove 11 is formed; a guide valve cover 2, on which a guide hole 21 is formed; and a guide pin 3, which cooperates with the guide hole 21 and has a bearing 4 provided at one end thereof located inside the guide valve cover 2; wherein the bearing 4 cooperates with the spiral inner groove 11;

[0023] Compared with the sliding friction between the traditional guide pin end and the spiral inner groove, in this solution, the bearing 4 at the end of the guide pin 3 and the spiral inner groove 11 have rolling friction. By changing the friction mode, the wear caused by the relative movement between the two can be reduced, avoiding abnormal valve switching action and jamming.

[0024] Different from the traditional threaded connection method, the guide pin 3 and the guide hole 21 in this solution are matched in a smooth rod and smooth hole manner, so the guide pin 3 will not move during the movement of the valve stem 1, ensuring the switching action and normal use of the valve.

[0025] like Figure 4 As shown, in order to illustrate the specific structure of the guide pin, the present invention adopts the guide pin 3 as a T-shaped cylindrical pin with a limiting ring 31 at the end;

[0026] like Figure 2 As shown, in order to limit the rotation and axial movement of the guide pin in the guide hole, the present invention adopts the limiting ring 31 to be an oblong structure; a cavity matching the limiting ring 31 is provided at one end of the outer side of the guide hole 21; a step groove 22 is provided at the bottom of the side wall of the guide valve cover 2, and the guide hole 21 is provided at the vertical wall of the step groove 22; the top positioning ring 51 of the valve body valve cover 5 cooperates with the step groove 22, and the inner wall of the positioning ring 51 is located on the outer side of the guide hole 21, and the inner wall of the positioning ring 51 is used to limit the axial movement of the guide pin 3 from the guide hole 21;

[0027] In this solution, the oblong-shaped limit ring 31 cooperates with the cavity to limit the rotation of the guide pin 3 and the axial movement of the guide pin 3 close to the valve stem 1; the outer side of the guide hole 21 is the inner wall of the positioning ring 51, which limits the axial movement of the guide pin 3 away from the valve stem 1 in the guide hole 21. In summary, the self-rotation and axial movement of the guide pin 3 are limited.

[0028] like Figure 2As shown, the outer wall of the guide pin 3 and the surface of the guide hole 21 are both subjected to a cobalt-based alloy hardening treatment by surfacing welding; the outer surface of the guide pin 3 and the surface of the guide hole 21 are subjected to a cobalt-based alloy hardening treatment by surfacing welding, and a hardened layer 6 is formed on the outer surface of the guide pin and the surface of the guide hole, thereby improving the hardness and strength of the mating surface. By grinding, the roughness of the mating surface of the guide pin 3 and the guide hole 21 is improved, the hardness can reach HRC40-45, and the roughness can reach Ra0.8, thereby preventing wear between the guide pin 3 and the guide hole 21.

[0029] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A friction reducing structure between the valve stem and the guide valve cover in a ball valve, characterized in that: include: The valve stem has a spiral inner groove formed on its outer peripheral wall; A guide valve cover having a guide hole formed thereon; and a guide pin, which cooperates with the guide hole and has a bearing provided at one end thereof located in the guide valve cover; Wherein, the bearing cooperates with the spiral inner groove.

2. A friction reducing structure for a valve stem and a guide valve cover in a ball valve according to claim 1, characterized in that: The guide pin is a T-shaped cylindrical pin with a limiting ring at the end.

3. The friction reducing structure between the valve stem and the guide valve cover in a ball valve according to claim 2, characterized in that: The limiting ring is an oblong structure; One end of the outer side of the guide hole is provided with a cavity matching the limiting ring.

4. The friction reducing structure between the valve stem and the guide valve cover in a ball valve according to claim 1, characterized in that: The outer wall of the guide pin and the surface of the guide hole are both subjected to a cobalt-based alloy hardening treatment by surfacing welding.

5. The anti-friction structure for the valve stem and the guide valve cover in a ball valve according to claim 1, characterized in that: A step groove is provided at the bottom of the side wall of the guide valve cover, and the guide hole is opened at the vertical wall of the step groove; The top positioning ring of the valve body and valve cover cooperates with the step groove, and the inner wall of the positioning ring is located on the outer side of the guide hole. The inner wall of the positioning ring is used to limit the axial movement of the guide pin from the guide hole.

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