Anti-locking top-mounted ball valve

Abstract

An anti-locking top-mounted ball valve comprises a ball valve body and a valve rod transmission assembly, the ball valve body comprises a valve body and a valve rod, the valve rod transmission assembly comprises a housing, an extension rod and a bearing, the housing is fixedly installed at the upper end of the valve body, the extension rod is connected with the valve rod, the bearing is arranged in the housing, and the extension rod is sleeved with the bearing. The extension rod has the advantages that the extension rod is matched with the bearing, so that the smooth degree of the extension rod during operation can be effectively improved, the phenomena that the extension rod is stuck due to long-time standing, the extension rod is eroded by the external environment for a long time and parts are rusted can be avoided, and meanwhile rainwater is prevented from permeating into the shell cover.

Description

Technical Field

[0001] The utility model relates to a ball valve, in particular to an anti-stuck top-mounted ball valve. Background Art

[0002] In industrial systems, ball valves, as a commonly used fluid control device, play an extremely important role. Their reliability and stability are crucial to the normal operation of the entire system. However, in actual use, ball valves may get stuck or become unscrewed, which not only affects the normal production, but also threatens the safety of the system.

[0003] One of the main reasons for the ball valve to get stuck is that the connection between the valve stem and the valve body is in contact with the outside world for a long time, causing the connection to rust or infiltrate impurities, which eventually makes the valve stem difficult to operate and rotate, resulting in sticking. Utility Model Content

[0004] In order to solve the above problems, a kind of anti-seizure top-entry ball valve is specially made, which can improve the thermal insulation performance of the ball valve and facilitate inspection and maintenance.

[0005] To achieve the above-mentioned purpose, the utility model solves the problem through the following technical scheme: an anti-sticking top-mounted ball valve, including a ball valve body and a valve stem transmission assembly, the ball valve body includes a valve body and a valve stem, the valve stem transmission assembly includes a shell cover, an extension rod and a bearing, the shell cover is fixedly installed on the upper end of the valve body, the extension rod is connected to the valve stem, the bearing is arranged in the shell cover, and the bearing sleeve is arranged on the extension rod.

[0006] Furthermore, the bearing comprises a first bearing and a second bearing, the first bearing is arranged at the bottom of the extension rod, and the second bearing is arranged at the upper end of the extension rod.

[0007] Furthermore, the shell cover is in an "I" shape as a whole, and the middle of the shell cover is a through hole for placing the extension rod. An upper flange is provided at the upper end of the shell cover, and a lower flange is provided at the lower end. The shell cover is connected to the valve body through the lower flange.

[0008] Furthermore, the upper flange surface is provided with an upper step for assembling the second bearing, and the lower flange surface is provided with a lower step for assembling the first bearing. The second bearing is tightly fitted with the upper step, and the lower step is tightly fitted with the first bearing.

[0009] Furthermore, the diameter of the through hole is at least 5 cm larger than the diameter between the extension rods.

[0010] Furthermore, an upper cover is provided on the surface of the upper flange, the upper cover is connected to the upper flange by bolts, and the second bearing is encapsulated between the upper cover and the upper flange.

[0011] Furthermore, an oil filling hole is provided between the through hole of the shell cover and the upper end surface of the upper flange, and a threaded plug is provided at the entrance of the oil filling hole.

[0012] Furthermore, lubricating oil is filled between the through hole of the shell cover and the extension rod.

[0013] The utility model is beneficial in that:

[0014] 1. The extension rod cooperates with the bearing, which can effectively improve the smoothness of the extension rod during operation and avoid the extension rod from getting stuck due to long-term static operation.

[0015] 2. Lubricating liquid is filled between the extension rod and the shell cover. On the one hand, it can keep the bearing smooth, and on the other hand, it also acts as an oil seal. Even if it is corroded by the external environment for a long time, it will not cause the parts to rust. At the same time, it also prevents rainwater from seeping into the shell cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a schematic structural diagram of an anti-stuck top-entry ball valve.

[0017] Figure 2 for Figure 1 A partial enlarged schematic diagram of part A.

[0018] Reference numerals: ball valve body 1 , valve body 2 , valve stem 3 , shell cover 4 , first bearing 5 , extension rod 6 , through hole 7 , upper flange 8 , second bearing 9 , cover 10 , oil filling hole 11 , threaded plug 12 . DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0020] A top-mounted ball valve with an anti-stuck structure includes a ball valve body and a valve stem transmission assembly. The ball valve body includes a valve body and a valve stem. The valve stem transmission assembly includes a shell cover, an extension rod and a bearing. The shell cover is fixedly mounted on the upper end of the valve body. The extension rod is connected to the valve stem. The bearing is arranged in the shell cover, and the bearing sleeve is arranged on the extension rod. The bearing includes a first bearing and a second bearing. The first bearing is arranged at the bottom of the extension rod, and the second bearing is arranged at the upper end of the extension rod. The shell cover is in the shape of an "I" as a whole. The middle part of the shell cover is a through hole for placing the extension rod. The upper end of the shell cover is provided with an upper flange, and the lower end is provided with a lower flange. The shell cover is connected to the valve body through the lower flange. An upper step for assembling the second bearing is provided on the surface of the upper flange, and a lower step for assembling the first bearing is provided on the surface of the lower flange. The second bearing is tightly matched with the upper step, and the lower step is tightly matched with the first bearing. The diameter of the through hole is at least 5 cm larger than that between the extension rods. An upper cover is also provided on the surface of the upper flange. The upper cover is connected to the upper flange by bolts, and the second bearing is encapsulated between the upper cover and the upper flange. An oil filling hole is arranged between the through hole of the shell cover and the upper end surface of the upper flange, and a threaded plug is arranged at the entrance of the oil filling hole. Lubricating oil is filled between the through hole of the shell cover and the extension rod.

[0021] The actual method of use is as follows: install the first bearing tightly on the lower step, and fix the shell cover as a whole on the valve body through the lower flange. The lower end of the extension rod can rotate with the first bearing, and the lower end of the extension rod is connected to the valve stem to drive it to rotate. The upper step of the upper end of the shell cover is provided with a second bearing, and the upper end of the extension rod is connected to the second bearing, and the second bearing is also tightly fitted with the upper step. There is a gap of at least 2.5cm between the through hole of the shell cover and the extension rod, and the filling lubricant can be added in the gap. The lubricant is added to the through hole through the oil filling hole, and it is usually required to be added to the highest position. A threaded plug is provided at the entrance of the oil filling hole to prevent the lubricant from overflowing. After completion, the cover is installed on the upper flange, and the threaded plug and the second bearing are covered. When in use, the first bearing and the second bearing can be immersed in the lubricant for a long time, and the oily lubricant can also prevent rainwater from seeping into the parts from the assembly.

[0022] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description, and it is intended that all changes within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. An anti-seizure top-entry ball valve, characterized in that: It includes a ball valve body and a valve stem transmission assembly. The ball valve body includes a valve body and a valve stem. The valve stem transmission assembly includes a shell cover, an extension rod and a bearing. The shell cover is fixedly installed on the upper end of the valve body, the extension rod is connected to the valve stem, the bearing is arranged in the shell cover, and the bearing sleeve is arranged on the extension rod.

2. The anti-seizure top-entry ball valve according to claim 1, characterized in that: The bearing comprises a first bearing and a second bearing, wherein the first bearing is arranged at the bottom of the extension rod, and the second bearing is arranged at the upper end of the extension rod.

3. The anti-seizure top-entry ball valve according to claim 2, characterized in that: The shell cover is in the shape of an "I" as a whole. The middle part of the shell cover is a through hole for placing an extension rod. An upper flange is provided at the upper end of the shell cover and a lower flange is provided at the lower end. The shell cover is connected to the valve body through the lower flange.

4. The anti-seizure top-entry ball valve according to claim 3, characterized in that: The upper flange surface is provided with an upper step for assembling the second bearing, and the lower flange surface is provided with a lower step for assembling the first bearing. The second bearing is tightly matched with the upper step, and the lower step is tightly matched with the first bearing.

5. The anti-seizure top-entry ball valve according to claim 4, characterized in that: The diameter of the through hole is at least 5 cm larger than the distance between the extension rods.

6. The anti-seizure top-entry ball valve according to claim 5, characterized in that: An upper cover is also provided on the surface of the upper flange, the upper cover is connected to the upper flange via bolts, and the second bearing is encapsulated between the upper cover and the upper flange.

7. The anti-seizure top-entry ball valve according to claim 6, characterized in that: An oil filling hole is arranged between the through hole of the shell cover and the upper end surface of the upper flange, and a threaded plug is arranged at the entrance of the oil filling hole.

8. The anti-seizure top-entry ball valve according to claim 7, characterized in that: The space between the through hole of the shell cover and the extension rod is filled with lubricating oil.

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