A high sealing ball valve

Abstract

The present invention proposes a high-sealing ball valve, comprising an inlet valve body, an outlet valve body, a ball valve, a valve seat, a first sealing member, a spring, a handle and a valve stem control mechanism, wherein two valve seats are installed in the inlet valve body and the outlet valve body, the ball valve is installed in the two valve seats, one end of the valve seat close to the ball valve is installed with a first sealing member that abuts against the ball valve, and the other end of the valve seat abuts against the spring, the valve stem control mechanism is provided with a connecting seat, a valve stem shaft, a shaft sleeve, an X-shaped sealing member and a second sealing member, the outer periphery of the connecting seat is provided with a second sealing member that closely matches the inner wall of the connecting cavity, the shaft sleeve is sleeved on the outside of the valve stem shaft, the valve stem shaft and the shaft sleeve are installed in the connecting seat, an X-shaped sealing member is provided between the bottom of the shaft sleeve and the connecting seat, the bottom of the valve stem shaft is connected to the ball valve, and a handle is installed on the top of the valve stem shaft. The ball valve has good sealing performance and can extend the service life of the product.

Description

[Technical field]

[0001] The invention relates to the technical field of ball valves, in particular to a high-sealing ball valve. [Background technology]

[0002] The main features of the ball valve are compact structure, reliable sealing, simple structure, easy maintenance, the sealing surface and the spherical surface are often in a closed state, not easily eroded by the medium, easy to operate and maintain, suitable for general working media such as water, solvents, acids and natural gas, and also suitable for media with harsh working conditions, such as oxygen, hydrogen peroxide, methane and ethylene, etc. Therefore, ball valves have been widely used in various industries. Regardless of the single style or combined style of the above-mentioned valve seat, due to various factors, it is possible to cause the valve seat to be loosely sealed, thereby causing the medium in the pipeline to leak. Therefore, medium leakage is also one of the common problems of ball valves. At present, the sealing structure between the valve stem and the valve body of most valves is too complicated, especially the traditional compression packing sealing method has more disadvantages, the packing preload is difficult to adjust, too tight increases friction, making the torque larger, too loose has poor sealing effect, and there is no sealing compensation. Generally, it needs to be adjusted after a period of use. Now a high sealing ball valve is proposed. [Summary of the invention]

[0003] The purpose of the present invention is to solve the problems in the prior art and to provide a high-sealing ball valve with reliable sealing performance and long product service life.

[0004] To achieve the above-mentioned purpose, the present invention proposes a high-sealing ball valve, comprising an inlet valve body, an outlet valve body, a ball valve, a valve seat, a first sealing member, a spring, a handle and a valve stem control mechanism, wherein a cavity for accommodating the ball valve is formed between the inlet valve body and the outlet valve body, two symmetrically arranged valve seats are installed in the inlet valve body and the outlet valve body, the ball valve is installed in the two valve seats, a plurality of springs are installed in the inlet valve body and the outlet valve body respectively, a first sealing member is installed at one end of the valve seat close to the ball valve, the first sealing member is abutted against the ball valve, and the other end of the valve seat is in contact with the spring The springs are abutted against each other, and a connecting cavity for installing a valve stem control mechanism is provided above the inlet valve body. A connecting seat, a valve stem shaft, a bushing, an X-shaped seal and a second seal are provided on the valve stem control mechanism. The connecting seat is installed in the connecting cavity by a plurality of fasteners. A second seal that tightly matches the inner wall of the connecting cavity is provided on the outer periphery of the connecting seat. The bushing is sleeved on the outside of the valve stem shaft, and the valve stem shaft and the bushing are installed in the connecting seat. An X-shaped seal is provided between the bottom of the bushing and the connecting seat. The bottom of the valve stem shaft is connected to the ball valve, and a handle is installed on the top of the valve stem shaft.

[0005] Preferably, the valve seat includes a mounting portion and a sealing portion, the outer ring of the mounting portion is provided with a plurality of first annular sealing rings spaced apart along the axial direction, the first sealing component includes a first skeleton, a first sealing body, a sealing bevel body and a first sealing lip, a second annular groove is provided on the first conical surface of the sealing portion, one end of the first skeleton is installed in the second annular groove, and a first sealing body is provided at the other end of the first skeleton, the first sealing body includes a sealing bevel body covering the end of the first skeleton, and a first sealing lip radially expanding along the axial direction, the sealing bevel body and the first sealing lip are tightly matched with the ball valve.

[0006] Preferably, the valve stem control mechanism also includes a first sealing ring, a second sealing ring and bolts, the connecting seat has a central axis hole for the valve stem shaft to pass through, a first stepped mounting cavity for installing a sleeve is provided above the central axis hole, the sleeve is connected to the connecting seat by a plurality of bolts, the bottom of the sleeve has a driving portion that abuts against an X-shaped seal, a first sealing ring is installed between the inner wall of the sleeve and the outer wall of the valve stem shaft, a second sealing ring is installed between the outer wall of the sleeve and the first stepped mounting cavity, the top of the sleeve has a limit plate, the upper wall of the second seal is provided with an annular groove, and the cross-sectional shape of the annular groove is semicircular.

[0007] Preferably, the shaft sleeve includes a limit plate and a mounting sleeve arranged in sequence from top to bottom, the inner wall of the mounting sleeve is provided with a first sealing groove for installing a first sealing ring, the outer wall of the mounting sleeve is provided with a second sealing groove for installing a second sealing ring, and the limit plate is evenly distributed with a plurality of mounting holes.

[0008] Preferably, a driving part is provided at the bottom of the mounting sleeve, the cross-sectional shape of the driving part is a trapezoid, the outer wall of the driving part is an outer conical surface with an outer diameter gradually decreasing from top to bottom, the inner wall of the driving part is an inner conical surface with an outer diameter gradually increasing from top to bottom, the cross-sectional shape of the X-shaped seal is X-shaped, and the X-shaped seal has four sealing skirts, the two sealing skirts of the outer ring of the X-shaped seal abut against the first step mounting cavity, and the two sealing skirts of the inner ring of the X-shaped seal abut against the valve stem shaft.

[0009] Beneficial effects of the present invention: The present invention cooperates with the inlet valve body, the outlet valve body, the ball valve, the valve seat, the first seal, the spring, the handle and the valve stem control mechanism, etc. The first seal is provided with a sealing bevel and a first sealing lip, which can abut against the ball valve to achieve a double sealing effect; the valve seat is abutted against the side of the ball valve by the action of the spring, and the first seal is compensated for the sealing, thereby further improving the sealing effect. In addition, when the medium in the valve body flows out from the gap between the valve stem shaft and the shaft sleeve, the four sealing skirts of the X-shaped seal are first double-sealed, and then the sealing is achieved through the first sealing ring and the second sealing ring, so that the sealing performance is reliable and durable. In addition, by tightening the bolts, the shaft sleeve can be controlled to be pressed inward, and the driving part at the bottom of the shaft sleeve can squeeze the sealing skirt, so that the sealing skirt is close to the valve body and the valve stem shaft, further improving the sealing effect.

[0010] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.

Brief Description of the Drawings

[0011] Figure 1 It is a cross-sectional schematic diagram of a high sealing ball valve of the present invention;

[0012] Figure 2 yes Figure 1 A magnified schematic diagram of point A;

[0013] Figure 3 It is a cross-sectional schematic diagram of a first sealing member of a high-sealing ball valve of the present invention;

[0014] Figure 4 It is a cross-sectional schematic diagram of a high sealing ball valve of the present invention;

[0015] Figure 5 It is a cross-sectional schematic diagram of a connecting seat of a high-sealing ball valve of the present invention;

[0016] Figure 6 It is a cross-sectional schematic diagram of a shaft sleeve of a high-sealing ball valve of the present invention;

[0017] Figure 7 It is a cross-sectional schematic diagram of an X-shaped sealing member of a high-sealing ball valve of the present invention. [Specific implementation method]

[0018] See also Figures 1 to 7The present invention discloses a high-sealing ball valve, comprising an inlet valve body 1, an outlet valve body 2, a ball valve 3, a valve seat 4, a first sealing member 5, a spring 6, a handle 7 and a valve stem control mechanism 8. A cavity for accommodating the ball valve 3 is formed between the inlet valve body 1 and the outlet valve body 2. Two symmetrically arranged valve seats 4 are installed in the inlet valve body 1 and the outlet valve body 2. The ball valve 3 is installed in the two valve seats 4. A plurality of springs 6 are installed in the inlet valve body 1 and the outlet valve body 2, respectively. A first sealing member 5 is installed at one end of the valve seat 4 close to the ball valve 3. The first sealing member 5 abuts against the ball valve 3. The other end of the valve seat 4 abuts against the spring 6. The upper end of the inlet valve body 1 A connecting cavity 10 for installing a valve stem control mechanism 8 is provided, and a connecting seat 81, a valve stem shaft 82, a sleeve 83, an X-shaped seal 84 and a second seal 87 are provided on the valve stem control mechanism 8. The connecting seat 81 is installed in the connecting cavity 10 by a plurality of fasteners. The outer periphery of the connecting seat 81 is provided with a second seal 87 that closely matches the inner wall of the connecting cavity 10. The sleeve 83 is sleeved on the outside of the valve stem shaft 82. The valve stem shaft 82 and the sleeve 83 are installed in the connecting seat 81. An X-shaped seal 84 is provided between the bottom of the sleeve 83 and the connecting seat 81. The bottom of the valve stem shaft 82 is connected to the ball valve 3, and a handle 7 is installed on the top of the valve stem shaft 82.

[0019] Further, the inlet valve body 1 and the outlet valve body 2 are respectively provided with a first installation cavity 11, the valve seat 4 is installed in the first installation cavity 11, a first stepped groove 12 is provided on the side of the first installation cavity 11 close to the ball valve 3, and a plurality of spring installation holes 13 for installing the spring 6 are distributed circumferentially on the first stepped groove 12; the valve seat 4 includes a mounting portion 41 and a sealing portion 42, the mounting portion 41 is arranged in the first installation cavity 11, the sealing portion 42 is arranged in the first stepped groove 12, and a plurality of first annular sealing rings 411 are installed on the outer ring of the mounting portion 41 at intervals along the axial direction, and the first annular sealing ring 4 11 is tightly matched with the first installation cavity 11, the first sealing member 5 includes a first skeleton 51, a first sealing body 52, a sealing bevel body 53 and a first sealing lip 54, a second annular groove is opened on the first conical surface of the sealing portion 42, one end of the first skeleton 51 is installed in the second annular groove, and the other end of the first skeleton 51 is provided with a first sealing body 52, the first sealing body 52 includes a sealing bevel body 53 coated on the end of the first skeleton 51, and a first sealing lip 54 radially expanded along the axial direction, the sealing bevel body 53 and the first sealing lip 54 are tightly matched with the ball valve 3, and can achieve a double sealing effect.

[0020] Furthermore, the valve stem control mechanism 8 also includes a first sealing ring 85, a second sealing ring 86 and a bolt 88. The connecting seat 81 has a central shaft hole 811 for the valve stem shaft 82 to pass through. A first stepped mounting cavity 812 for mounting a sleeve 83 is provided above the central shaft hole 811. The sleeve 83 is connected to the connecting seat 81 by a plurality of bolts 88. The bottom of the sleeve 83 has a driving portion 834 that abuts against the X-shaped seal 84. A first sealing ring 85 is installed between the inner wall of the sleeve 83 and the outer wall of the valve stem shaft 82. A second sealing ring 86 is installed between the outer wall of the sleeve 83 and the first stepped mounting cavity 812. The top of the sleeve 83 has a limiting plate 831. The upper wall of the second seal 87 is provided with an annular groove, and the cross-sectional shape of the annular groove is semicircular.

[0021] Furthermore, the shaft sleeve 83 includes a limit plate 831 and a mounting sleeve 832 arranged in sequence from top to bottom, the inner wall of the mounting sleeve 832 is provided with a first sealing groove for installing a first sealing ring 85, the outer wall of the mounting sleeve 832 is provided with a second sealing groove for installing a second sealing ring 86, and the limit plate 831 is evenly distributed with a plurality of mounting holes 8311.

[0022] Furthermore, a driving part 834 is provided at the bottom of the installation sleeve 832, and the cross-sectional shape of the driving part 834 is a trapezoid, and the outer wall of the driving part 834 is an outer conical surface 8341 whose outer diameter gradually decreases from top to bottom, and the inner wall of the driving part 834 is an inner conical surface 8342 whose outer diameter gradually increases from top to bottom, and the cross-sectional shape of the X-shaped seal 84 is an X-shape, and the X-shaped seal 84 has four sealing skirts 840, and the two sealing skirts 840 of the outer ring of the X-shaped seal 84 abut against the first step installation cavity 812, and the two sealing skirts 840 of the inner ring of the X-shaped seal 84 abut against the valve stem shaft 82. In the process of the sleeve moving downward, it can be ensured that the driving part abuts against the upper part of the X-shaped seal, so that the X-shaped seal abuts against the valve body and the valve stem shaft, and the effect of compensating sealing is achieved.

[0023] Furthermore, a second step mounting cavity 813 adapted to the limiting plate 831 is provided above the first step mounting cavity 812, and a plurality of threaded holes 814 adapted to the bolts 88 are circumferentially opened on the lower wall of the second step mounting cavity 813, and the cross-sectional shapes of the second step mounting cavity 813, the first step mounting cavity 812 and the center axis hole 811 are all circular, and the outer diameter of the second step mounting cavity 813 is greater than the outer diameter of the first step mounting cavity 812, and the outer diameter of the first step mounting cavity 812 is greater than the outer diameter of the center axis hole 811.

[0024] Working process of the present invention:

[0025] The present invention provides a ball valve with high sealing performance. The first sealing member 5 and the second annular sealing ring 422 can abut against the ball valve 3 to achieve a double sealing effect. The first sealing member 5 is provided with a sealing bevel 53 and a first sealing lip 54. The first annular sealing ring 411 can abut against the first installation cavity 11 for sealing, which can further improve the sealing performance. In addition, the action of the spring is used to make the valve seat 4 abut against one side of the ball valve 3, which further improves the sealing effect. In addition, the second seal 87 can abut against the outer wall of the connection cavity 10 and the connection seat 81 to improve the sealing performance between the two, and by providing an annular groove at the top of the second seal 87, when the medium applies pressure to the second seal, the second seal is deformed, which improves the sealing effect; when assembling the valve stem shaft, first insert the valve stem shaft 82 into the connection seat 81, place the X-shaped seal 84 at the bottom of the first step installation cavity 812, install the first sealing ring 85 and the second sealing ring 86 on the first sealing groove respectively, and then install the shaft sleeve 83 into the valve stem shaft 82 and the connection seat 81, and pre-tighten with bolts 88. When the medium in the valve body flows out from the gap between the valve stem shaft and the shaft sleeve, the four sealing skirts 840 of the X-shaped seal 84 are first double-sealed, and then multiple seals are achieved through the first sealing ring 85 and the second sealing ring 86, so that the sealing performance is reliable and durable. In addition, by tightening the bolts 88, the sleeve 83 can be controlled to be pressed inward, and the driving part at the bottom of the sleeve 83 can squeeze the sealing skirt 840, so that the sealing skirt 840 is tightly attached to the connecting seat 81 and the valve stem shaft 82, further improving the sealing effect.

[0026] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. A high sealing ball valve, characterized by: The invention comprises an inlet valve body (1), an outlet valve body (2), a ball valve (3), a valve seat (4), a first sealing member (5), a spring (6), a handle (7) and a valve stem control mechanism (8); a cavity for accommodating the ball valve (3) is formed between the inlet valve body (1) and the outlet valve body (2); two symmetrically arranged valve seats (4) are installed in the inlet valve body (1) and the outlet valve body (2); the ball valve (3) is installed in the two valve seats (4); a plurality of springs (6) are installed in the inlet valve body (1) and the outlet valve body (2), respectively; a first sealing member (5), a spring (6), a handle (7) and a valve stem control mechanism (8); a first sealing member (5) is installed at one end of the valve seat (4) close to the ball valve (3); The first sealing member (5) is in abutment with the ball valve (3), the other end of the valve seat (4) is in abutment with the spring (6), a connecting cavity (10) for installing a valve stem control mechanism (8) is provided above the inlet valve body (1), the valve stem control mechanism (8) is provided with a connecting seat (81), a valve stem shaft (82), a shaft sleeve (83), an X-shaped sealing member (84) and a second sealing member (87), the connecting seat (81) is installed in the connecting cavity (10) by means of a plurality of fasteners, and the outer periphery of the connecting seat (81) is provided with a first sealing member (84) which is tightly matched with the inner wall of the connecting cavity (10). The second sealing member (87) is provided, wherein the shaft sleeve (83) is sleeved on the outside of the valve stem shaft (82), the valve stem shaft (82) and the shaft sleeve (83) are installed in the connecting seat (81), an X-shaped sealing member (84) is provided between the bottom of the shaft sleeve (83) and the connecting seat (81), the bottom of the valve stem shaft (82) is connected to the ball valve (3), and a handle (7) is installed on the top of the valve stem shaft (82); the valve seat (4) comprises a mounting portion (41) and a sealing portion (42), the outer ring of the mounting portion (41) is provided with a plurality of first annular sealing rings (411) spaced apart along the axial direction, and the first sealing member (5) is provided with a plurality of first annular sealing rings (411) spaced apart along the axial direction. The sealing member (42) comprises a first frame (51), a first sealing body (52), a sealing bevel body (53) and a first sealing lip (54); a second annular groove is provided on the first conical surface of the sealing portion (42); one end of the first frame (51) is mounted in the second annular groove; the other end of the first frame (51) is provided with a first sealing body (52); the first sealing body (52) comprises a sealing bevel body (53) covering the end of the first frame (51) and a first sealing lip (54) radially expanding outwardly in the axial direction; the sealing bevel body (53) and the first sealing lip (54) are tightly matched with the ball valve (3);The valve stem control mechanism (8) further comprises a first sealing ring (85), a second sealing ring (86) and a bolt (88); the connection seat (81) has a central shaft hole (811) for the valve stem shaft (82) to pass through; a first stepped mounting cavity (812) for mounting a shaft sleeve (83) is provided above the central shaft hole (811); the shaft sleeve (83) is connected to the connection seat (81) via a plurality of bolts (88); the bottom of the shaft sleeve (83) has a driving portion (834) that abuts against an X-shaped sealing member (84); a first sealing ring (85) is installed between an inner wall of the shaft sleeve (83) and an outer wall of the valve stem shaft (82); a second sealing ring (86) is installed between an outer wall of the shaft sleeve (83) and the first stepped mounting cavity (812); a limiting plate (831) is provided at the top of the shaft sleeve (83); an annular groove is provided on the upper wall of the second sealing member (87); and the cross-sectional shape of the annular groove is semicircular. ; 2. A high sealing ball valve according to claim 1, characterized in that: The shaft sleeve (83) comprises a limiting plate (831) and a mounting sleeve (832) which are arranged in sequence from top to bottom; the inner wall of the mounting sleeve (832) is provided with a first sealing groove for mounting a first sealing ring (85); the outer wall of the mounting sleeve (832) is provided with a second sealing groove for mounting a second sealing ring (86); and the limiting plate (831) is evenly distributed with a plurality of mounting holes (8311).

3. A high sealing ball valve as claimed in claim 2, characterized in that: A driving portion (834) is provided at the bottom of the mounting sleeve (832), the cross-sectional shape of the driving portion (834) is a trapezoid, the outer wall of the driving portion (834) is an outer conical surface (8341) whose outer diameter gradually decreases from top to bottom, and the inner wall of the driving portion (834) is an inner conical surface (8342) whose outer diameter gradually increases from top to bottom, the cross-sectional shape of the X-shaped seal (84) is an X-shape, and the X-shaped seal (84) has four sealing skirts (840), the two sealing skirts (840) of the outer ring of the X-shaped seal (84) abut against the first stepped mounting cavity (812), and the two sealing skirts (840) of the inner ring of the X-shaped seal (84) abut against the valve stem shaft (82).

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