Valve rod for stop valve

Abstract

The valve rod comprises a rod body, a fixed end is arranged at the top end of the rod body, a conical section is arranged at the tail end of the rod body, the bottom of the conical section is fixed to a tool retracting rod, the bottom end of the tool retracting rod is fixedly connected with a limiting ring, the bottom of the limiting ring is fixedly connected with a threaded section, and the bottom end of the threaded section is fixedly connected with an extrusion boss. The bottom end of the extrusion boss is fixedly connected with a butt joint block through a connecting rod, an oil injection hole is formed in the middle of the fixed end, the bottom end of the butt joint block is an arc face, an oil outlet hole is formed in a rod body, and meanwhile a limiting ring is arranged above the threaded section of the valve rod so that the situation that the position precision among the valve element, the valve rod and the valve body is out of tolerance after assembly due to machining errors can be avoided. The machining precision of the valve rod is improved, and meanwhile the clamping stagnation phenomenon occurring when the valve is used when the valve element and the valve rod are not coaxial due to the fact that the contact surface of the limiting ring and the valve element is not flat is avoided.

Description

Technical Field

[0001] The utility model relates to the field of stop valve stems, in particular to a valve stem used for a stop valve. Background Art

[0002] The globe valve is one of the most widely used valves. The closing principle of the globe valve is to rely on the valve stem pressure to make the valve disc sealing surface fit closely with the valve seat sealing surface to prevent the medium from flowing. As an extremely important shut-off valve, the globe valve is sealed by applying torque to the valve stem. The valve stem applies pressure to the valve disc in the axial direction to make the valve disc sealing surface fit closely with the valve seat sealing surface to prevent the medium from leaking along the gap between the sealing surfaces. The valve stem drives the valve disc to move vertically along the center line of the valve seat. In this way, the opening and closing height of the globe valve is small during the opening and closing process, which is easy to adjust the flow, and is easy to manufacture and maintain, and has a wide range of pressure applications.

[0003] Due to the pressure exerted by the valve stem on the valve disc, the connection point between the two is the force transmission point. During long-term use, it is easy to produce a certain deformation, which will cause unstable force and cause leakage at the valve disc. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a valve stem for a stop valve, which is provided with a hole structure at the fixed end and the stem body, including an oil filling hole, a mounting hole and an oil outlet hole structure, so that the lubricating oil added to the end of the valve stem can directly enter the valve body, lubricate the valve stem and the valve body, prevent the valve stem from rusting and reduce the wear between the valve stem and the valve body. At the same time, a limit ring is arranged above the threaded section of the valve stem to avoid errors during processing resulting in excessive position accuracy between the valve core, the valve stem and the valve body after assembly, and at the same time, a tool retracting rod is arranged on both sides of the limit ring (an empty groove structure is formed between the tool retracting rod structure and the top conical section and the limit ring at the bottom), which can facilitate the processing of the valve stem and improve the processing accuracy of the valve stem, and also avoid the stuck phenomenon of the valve when in use when the valve core and the valve stem are not coaxial due to the uneven surface contacted by the limit ring and the valve core.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a valve stem for a stop valve, comprising a rod body, a fixed end is provided at the top end of the rod body, a tapered section is provided at the tail end, the bottom of the tapered section is fixed to a knife retracting rod, the bottom end of the knife retracting rod is fixedly connected to a limiting ring, the bottom of the limiting ring is fixedly connected to a threaded section, the bottom end of the threaded section is fixedly connected to an extrusion boss, the bottom end of the extrusion boss is fixedly connected to a docking block via a connecting rod, an oil filling hole is provided in the middle of the fixed end, the bottom end of the docking block is an arc surface, and an oil outlet hole is provided on the rod body.

[0006] As a preferred technical solution of the utility model, both ends of the tapered section are tapered structures, and the diameter of the middle portion of the tapered section is larger than the diameter of the rod body.

[0007] As a preferred technical solution of the utility model, the storage of the knife-retracting rod is adapted to the dimensions of the rod body and the two ends of the tapered section.

[0008] As a preferred technical solution of the utility model, the size of the limit ring is matched with the size of the bottom end of the extrusion boss and the docking block.

[0009] As a preferred technical solution of the utility model, the extrusion boss is a truncated cone structure with a small top end and a large bottom end.

[0010] As a preferred technical solution of the utility model, the surfaces of the extrusion boss and the docking block are both coated with a chrome-plated layer.

[0011] As a preferred technical solution of the utility model, a plurality of groups of mounting holes are provided on the top side wall of the fixed end.

[0012] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0013] 1. In this device, by coating the extrusion boss and the docking block with a chrome-plated layer, the valve stem can remain stable when a vertical force is applied. During long-term use, the conical and arc surface structures are used to ensure that it is not easily deformed, and the coating structure is used to extend the overall service life.

[0014] 2. In this device, a hole structure is provided at the fixed end and the rod body, including an oil filling hole, a mounting hole and an oil outlet hole structure, so that the lubricating oil added to the end of the valve stem can directly enter the valve body, lubricate the valve stem and the valve body, prevent the valve stem from rusting and reduce the wear between the valve stem and the valve body. At the same time, a limit ring is provided above the threaded section of the valve stem to avoid errors during processing that lead to positional accuracy errors between the valve core, valve stem and valve body after assembly. At the same time, a retracting rod is provided on both sides of the limit ring (an empty groove structure is formed between the retracting rod structure and the top conical section and the limit ring at the bottom), which can facilitate the processing of the valve stem and improve the processing accuracy of the valve stem. At the same time, it also avoids the phenomenon of the valve being stuck when the valve core and the valve stem are not coaxial due to the uneven surface of the contact between the limit ring and the valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is one of the structural schematic diagrams of the utility model;

[0016] Figure 2 This is the second structural diagram of the utility model;

[0017] Figure 3It is a structural side view of the utility model;

[0018] Figure 4 It is the structural front view of the utility model.

[0019] Among them: 1. Rod body; 2. Fixed end; 21. Oil filling hole; 22. Mounting hole; 3. Oil outlet hole; 4. Tapered section; 5. Retracting rod; 6. Limiting ring; 7. Threaded section; 8. Extrusion boss; 9. Docking block. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, purpose and efficacy of the utility model easy to understand, the utility model is further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the utility model, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the utility model. The experimental methods in the following embodiments are conventional methods unless otherwise specified, and the materials, reagents, etc. used in the following embodiments are all commercially available unless otherwise specified.

[0021] Embodiment:

[0022] like Figure 1-4 As shown, the utility model provides a valve stem for a stop valve, including a rod body 1, a fixed end 2 is provided at the top of the rod body 1, a tapered section 4 is provided at the tail end, the bottom of the tapered section 4 is fixed to a knife-retracting rod 5, the bottom end of the knife-retracting rod 5 is fixedly connected to a limiting ring 6, the bottom of the limiting ring 6 is fixedly connected to a threaded section 7, the bottom end of the threaded section 7 is fixedly connected to an extrusion boss 8, the bottom end of the extrusion boss 8 is fixedly connected to a docking block 9 through a connecting rod, an oil filling hole 21 is provided in the middle of the fixed end 2, the bottom end of the docking block 9 is an arc surface, and an oil outlet hole 3 is provided on the rod body 1.

[0023] In other embodiments, both ends of the tapered section 4 are tapered structures, and the middle diameter of the tapered section 4 is larger than the diameter of the rod body 1; the storage of the retracting rod 5 is adapted to the dimensions of the rod body 1 and both ends of the tapered section 4; the size of the limit ring 6 is adapted to the dimensions of the bottom end of the extrusion boss 8 and the docking block 9; by opening a hole structure at the fixed end 2 and the rod body 1, including an oil filling hole 21, a mounting hole 22 and an oil outlet hole 3 structure, the lubricating oil added to the end of the valve stem can directly enter the interior of the valve body, lubricate the valve stem and the valve body, prevent the valve stem from rusting, and reduce the wear between the valve stem and the valve body. At the same time, a limit ring 6 is arranged above the valve stem threaded section 7 to avoid errors during processing that may lead to excessive position accuracy between the valve core, valve stem and valve body after assembly. At the same time, a retraction rod 5 is arranged on both sides of the limit ring 6 (an empty groove structure is formed between the retraction rod 5 structure and the top conical section 4 and the limit ring 6 at the bottom), which can facilitate the processing of the valve stem and improve the processing accuracy of the valve stem. At the same time, it can also avoid the valve core and valve stem not being coaxial due to the uneven surface contacting the limit ring 6 and the valve core, which may cause the valve to get stuck during use.

[0024] The extrusion boss 8 is a truncated cone structure with a small top and a large bottom; the surfaces of the extrusion boss 8 and the docking block 9 are coated with a chrome-plated layer. By coating the extrusion boss 8 and the docking block 9 with a chrome-plated layer, the valve stem can remain stable when a vertical force is applied. During long-term use, the conical and arc surface structures are utilized to ensure that it is not easily deformed, and the overall service life is extended by combining with the coating structure. A plurality of mounting holes 22 are provided on the top side wall of the fixed end 2.

[0025] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A valve stem for a stop valve, comprising a stem body (1), characterized in that: The top end of the rod body (1) is provided with a fixed end (2), and the tail end is provided with a tapered section (4); the bottom of the tapered section (4) is fixed to a knife-retracting rod (5); the bottom end of the knife-retracting rod (5) is fixedly connected to a limiting ring (6); the bottom of the limiting ring (6) is fixedly connected to a threaded section (7); the bottom end of the threaded section (7) is fixedly connected to an extrusion boss (8); the bottom end of the extrusion boss (8) is fixedly connected to a docking block (9) via a connecting rod; an oil filling hole (21) is provided in the middle of the fixed end (2); the bottom end of the docking block (9) is an arc surface; and an oil outlet hole (3) is provided on the rod body (1).

2. A valve stem for a stop valve according to claim 1, characterized in that: Both ends of the conical section (4) are conical structures, and the diameter of the middle portion of the conical section (4) is larger than the diameter of the rod body (1).

3. A valve stem for a stop valve according to claim 1, characterized in that: The storage of the knife-retracting rod (5) is adapted to the dimensions of the rod body (1) and the two ends of the tapered section (4).

4. A valve stem for a stop valve according to claim 1, characterized in that: The size of the limiting ring (6) is compatible with the size of the bottom end of the extrusion boss (8) and the docking block (9).

5. A valve stem for a stop valve according to claim 1, characterized in that: The extrusion boss (8) is a truncated cone structure with a small top end and a large bottom end.

6. A valve stem for a stop valve according to claim 1, characterized in that: The surfaces of the extrusion boss (8) and the docking block (9) are both coated with a chrome-plated layer.

7. A valve stem for a stop valve according to claim 1, characterized in that: A plurality of mounting holes (22) are provided on the top side wall of the fixed end (2).

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