valve body sealing structure

Abstract

This utility model relates to a sealing structure for a valve body, including a valve core and a valve seat. The contact surface between the valve core and the valve seat is an annular conical surface. An annular sealing groove is provided on the annular conical surface of the valve core. The key technical point is that a shaped sealing ring is filled in the annular sealing groove. The shaped sealing ring consists of a sealing body and upper and lower annular limiting wings located on the upper and lower surfaces of the sealing body. Upper and lower limiting grooves corresponding to the upper and lower annular limiting wings are provided on the sidewall of the annular sealing groove. Multiple 45-degree cylindrical grooves facing the sealing body are evenly provided on the bottom surface of the annular sealing groove. A cylindrical slider is provided in each of the 45-degree cylindrical grooves. A longitudinal through hole communicating with the upper end of the 45-degree cylindrical groove is provided on the upper surface of the valve core. A positioning bolt is threaded to the upper end of the longitudinal through hole. A compression spring is fixed to the inner end face of the positioning bolt, and the lower end of the compression spring rests against the top surface of the cylindrical slider. This utility model solves the problem of poor sealing caused by wear of the valve core and valve seat sealing structure, thus extending its service life.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, specifically to a sealing structure for a valve body. Background Technology

[0002] Gate valves are a common type of valve in pipelines. Normally, rotating the operating lever moves the valve core inside the valve body downwards, causing the valve core to contact the valve seat and cut off the fluid passage, thus achieving the shut-off function. To ensure sealing, a sealing structure, such as a sealing ring embedded in the conical surface of the valve core, is usually provided at the contact surface between the valve core and the valve seat. However, after prolonged use, the sealing ring will wear down, resulting in a poor seal. Utility Model Content

[0003] The purpose of this invention is to provide a valve body sealing structure that is structurally sound and reliable in use, thereby solving the problem of poor sealing caused by wear of the valve core and valve seat sealing structure and extending service life.

[0004] The technical solution of this utility model is: A sealing structure for a valve body includes a valve core and a valve seat. The contact surface between the valve core and the valve seat is an annular conical surface. An annular sealing groove concentric with the valve core is provided on the annular conical surface. The key technical point is that an irregularly shaped sealing ring is filled in the annular sealing groove. The irregularly shaped sealing ring is composed of a sealing body with a circular cross-section, an upper annular limiting wing on the upper surface of the sealing body, and a lower annular limiting wing on the lower surface of the sealing body. An upper limiting groove corresponding to the upper annular limiting wing and a lower limiting groove corresponding to the lower annular limiting wing are provided on the side wall of the annular sealing groove. A plurality of 45-degree cylindrical grooves facing the sealing body are uniformly provided on the bottom surface of the annular sealing groove. A cylindrical slider is provided in the 45-degree cylindrical groove. The top surface of the cylindrical slider is parallel to the horizontal plane. A longitudinal through hole communicating with the upper end of the 45-degree cylindrical groove is provided on the upper surface of the valve core. A positioning bolt is threaded to the upper end of the longitudinal through hole. A compression spring is fixed to the inner end face of the positioning bolt. The lower end of the compression spring abuts against the top surface of the cylindrical slider.

[0005] In the aforementioned valve body sealing structure, the bottom surface of the cylindrical slider is provided with a cylindrical lower elastic pad, which rests on the sealing body of the irregular sealing ring.

[0006] The sealing structure of the valve body described above has a sealing groove on the upper surface of the valve core that is concentric with the longitudinal through hole, and an O-ring seal that contacts the lower end face of the nut of the positioning bolt in the sealing groove.

[0007] The beneficial effects of this utility model are: This invention utilizes positioning bolts, compression springs, cylindrical sliders, and cylindrical lower elastic pads to press against the sealing body of the irregularly shaped sealing ring. When the sealing body wears down, the compression springs work together to drive the corresponding cylindrical sliders to slide down along a 45-degree cylindrical groove to fill the gap. The cylindrical lower elastic pads continue to press against the sealing body of the irregularly shaped sealing ring, ensuring that the worn surface also makes tight contact with the annular conical surface of the valve seat, achieving elastic compensation. Based on this, the invention solves the problem of incomplete sealing caused by wear in the valve core and valve seat sealing structure, extending its service life. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 yes Figure 1 Top view of the central valve core; Figure 3 yes Figure 1 Enlarged view of section A in the middle; Figure 4 This is a schematic diagram of the cylindrical slider of this utility model.

[0009] In the diagram: 1. Valve core, 2. Positioning bolt, 3. Valve seat, 4. Irregular sealing ring, 5. O-ring seal, 6. Compression spring, 7. Upper annular limiting wing, 8. Lower annular limiting wing, 9. Cylindrical lower elastic pad, 10. Cylindrical slider, 11. Longitudinal through hole. Detailed Implementation

[0010] The present invention will be described in detail with reference to the accompanying drawings.

[0011] like Figures 1-4 As shown, the sealing structure of the valve body includes a valve core 1 and a valve seat 3. The contact surface between the valve core 1 and the valve seat 3 is an annular conical surface. An annular sealing groove concentric with the valve core 1 is provided on the annular conical surface of the valve core 1.

[0012] The annular sealing groove is filled with an irregularly shaped sealing ring 4, which is composed of a sealing body with a circular cross-section, an upper annular limiting wing 7 on the upper surface of the sealing body, and a lower annular limiting wing 8 on the lower surface of the sealing body. The side wall of the annular sealing groove is provided with an upper limiting groove corresponding to the upper annular limiting wing 7 and a lower limiting groove corresponding to the lower annular limiting wing 8.

[0013] The bottom surface of the annular sealing groove is uniformly provided with a plurality of 45-degree cylindrical grooves facing the sealing body. A cylindrical slider 10 is provided in the 45-degree cylindrical groove. A cylindrical lower elastic pad 9 is provided on the bottom surface of the cylindrical slider 10. The cylindrical lower elastic pad 9 rests on the sealing body of the irregular sealing ring 4. The top surface of the cylindrical slider 10 is parallel to the horizontal plane.

[0014] The upper surface of the valve core 1 is provided with a longitudinal through hole 11 communicating with the upper end of the 45-degree cylindrical groove. A positioning bolt 2 is threadedly connected to the upper end of the longitudinal through hole 11. A compression spring 6 is fixed to the inner end face of the positioning bolt 2. The lower end of the compression spring 6 rests on the top surface of the cylindrical slider 10. The upper surface of the valve core 1 is provided with a sealing groove concentric with the longitudinal through hole 11. An O-ring seal 5 is provided in the sealing groove, which contacts the lower end face of the nut of the positioning bolt 2.

[0015] Working principle: 1. In use, the valve core 1 inside the valve body is driven down by rotating the operating lever. The valve core 1 contacts the valve seat 3, and the sealing body of the irregular sealing ring 4 is in close contact with the annular conical surface of the valve seat 3 to achieve the function of shut-off sealing.

[0016] 2. After long-term use, the sealing body of the irregular sealing ring 4 will wear out. Each compression spring 6 drives the cylindrical slider 10 to slide down along the 45-degree cylindrical groove to fill the gap. The cylindrical lower elastic pad 9 continues to press against the sealing body of the irregular sealing ring 4, so that the worn surface is still in close contact with the annular conical surface of the valve seat 3, realizing elastic compensation and ensuring sealing performance.

[0017] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made within the scope of this utility model should still fall within the scope of this utility model.

Claims

1. A sealing structure for a valve body, comprising a valve core and a valve seat, wherein the contact surface between the valve core and the valve seat is an annular conical surface, and an annular sealing groove concentric with the annular conical surface of the valve core is provided thereon, characterized in that: The annular sealing groove is filled with an irregularly shaped sealing ring, which consists of a sealing body with a circular cross-section, an upper annular limiting wing on the upper surface of the sealing body, and a lower annular limiting wing on the lower surface of the sealing body. The side wall of the annular sealing groove is provided with an upper limiting groove corresponding to the upper annular limiting wing and a lower limiting groove corresponding to the lower annular limiting wing. The bottom surface of the annular sealing groove is evenly provided with a plurality of 45-degree cylindrical grooves facing the sealing body. A cylindrical slider is provided in the 45-degree cylindrical groove. The top surface of the cylindrical slider is parallel to the horizontal plane. The upper surface of the valve core is provided with a longitudinal through hole communicating with the upper end of the 45-degree cylindrical groove. A positioning bolt is threaded to the upper end of the longitudinal through hole. A compression spring is fixed to the inner end face of the positioning bolt. The lower end of the compression spring rests on the top surface of the cylindrical slider.

2. The sealing structure of the valve body according to claim 1, characterized in that: The bottom surface of the cylindrical slider is provided with a cylindrical lower elastic pad, which rests on the sealing body of the irregular sealing ring.

3. The sealing structure of the valve body according to claim 1, characterized in that: The upper surface of the valve core is provided with a sealing groove concentric with the longitudinal through hole, and an O-ring seal is provided in the sealing groove that contacts the lower end face of the nut of the positioning bolt.

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