A leak-proof ball valve

Abstract

The present invention proposes a sealed and leak-proof ball valve, comprising an inlet valve body, an outlet valve body, a ball valve, a valve seat, a first sealing member, a second sealing member, a spring and a valve stem control mechanism, wherein valve seats are installed in the inlet valve body and the outlet valve body, the ball valve is installed in two valve seats, a first sealing member that abuts against the ball valve is installed at one end of the valve seat close to the ball valve, a second sealing member is installed at the other end of the valve seat, an end of the spring abuts against one side of the second sealing member, a valve stem control mechanism is also installed on the inlet valve body, a connecting seat, a valve stem shaft, a shaft sleeve and an X-shaped sealing member are provided on the valve stem control mechanism, the shaft sleeve is arranged on the outside of the valve stem shaft, 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, a handle is installed on the top of the valve stem shaft, multiple sealings can be achieved, the sealing performance of the valve can be improved, and the service life of the product can be extended.

Description

[Technical field]

[0001] The invention relates to the technical field of ball valves, in particular to a sealed and leak-proof ball valve. [Background technology]

[0002] A ball valve is an opening and closing part used in a pipeline to control the flow and on-off of the fluid in the pipeline. The valve core in the valve is rotated by the rotating handle above the valve, and the flow rate of the fluid passing through the valve can be regulated and adjusted. The ball valve has a wide range of uses due to its strong flow, quick opening and closing, convenient installation, and many connection methods. Regardless of the single style or combined style of the above-mentioned valve seat, due to various factors, the valve seat may not be sealed tightly, 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 sealed and leak-proof 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 sealed and leak-proof ball valve which can achieve multiple seals, improve the sealing performance of the valve and extend the service life of the product.

[0004] To achieve the above-mentioned purpose, the present invention proposes a sealed and leak-proof ball valve, comprising an inlet valve body, an outlet valve body, a ball valve, a valve seat, a first sealing member, a second sealing member, a spring 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 first sealing member is installed at one end of the valve seat close to the ball valve, the first sealing member abuts against the ball valve, a first annular groove is provided at the other end of the valve seat, A second sealing member is installed in the first annular groove, and a plurality of springs are installed in the inlet valve body and the outlet valve body respectively. The end of the spring is abutted against one side of the second sealing member. A valve stem control mechanism is also installed on the inlet valve body. The valve stem control mechanism is provided with a connecting seat, a valve stem shaft, a shaft sleeve, and an X-shaped sealing member. The shaft sleeve is arranged on the outside of the valve stem shaft, and the valve stem shaft and the shaft sleeve are installed in the connecting seat. An X-shaped sealing member is arranged 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.

[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 sealing portion has a first annular groove formed at one end close to the mounting portion, a plurality of water channel branches are formed in the sealing portion, one end of the water channel branch is communicated with the cavity, and the other end of the water channel branch is communicated with the first annular groove.

[0006] Preferably, 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 opened on the first conical surface of the sealing portion, one end of the first skeleton is installed in the second annular groove, and the other end of the first skeleton is provided with a first sealing body, 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.

[0007] Preferably, the second sealing component includes a second frame and a second sealing body, one side of the second frame is abutted against the end of the spring, and the other side of the second frame is provided with a second sealing body, and the second sealing body has two symmetrically arranged second sealing lips, and the two second sealing lips are respectively abutted against the outer ring and inner ring of the first annular groove.

[0008] Preferably, the valve stem control mechanism also includes a first sealing ring, a second sealing ring, a third sealing ring and bolts. The connecting seat has a central axis hole for the valve stem shaft to pass through, and 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, and 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, and a limiting plate is provided on the top of the sleeve, and a third sealing ring is installed between the lower wall of the limiting plate and the connecting seat.

[0009] Preferably, the shaft sleeve includes a limit plate and a mounting sleeve arranged in sequence from top to bottom, the outer diameter of the limit plate is larger than the outer diameter of the mounting sleeve, and a third annular sealing groove is provided at the connection between the lower wall of the limit plate and the mounting sleeve, the outer ring of the third sealing groove is a second conical surface with an outer diameter gradually increasing from top to bottom, the third sealing groove abuts against a third sealing ring, 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 a plurality of mounting holes are evenly distributed on the limit plate.

[0010] 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.

[0011] 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 second seal, the spring and the valve stem control mechanism, etc., so that the first seal and the second annular seal ring can abut against the ball valve to achieve a double sealing effect. The first seal is provided with a sealing bevel and a first sealing lip, which can further improve the sealing performance; the medium pressure in the valve body can be applied to the second seal through the water channel branch, and the valve seat is abutted against one side of the ball valve by the reaction force, so as to perform sealing compensation on the first seal, and further improve 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 firstly double-sealed, and then multiple sealings are achieved through the first sealing ring, the second sealing ring and the third 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. On the one hand, 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. On the other hand, it can squeeze the third sealing ring, and further improve the sealing effect.

[0012] 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

[0013] Figure 1 It is a cross-sectional schematic diagram of a sealed and leak-proof ball valve of the present invention;

[0014] Figure 2 yes Figure 1 A magnified schematic diagram of point A;

[0015] Figure 3 It is a cross-sectional schematic diagram of a first sealing member of a sealed and leak-proof ball valve of the present invention;

[0016] Figure 4 It is a cross-sectional schematic diagram of a second sealing member of a sealed and leak-proof ball valve of the present invention.

[0017] Figure 5 It is a cross-sectional schematic diagram of a sealed and leak-proof ball valve of the present invention;

[0018] Figure 6 It is a cross-sectional schematic diagram of a connection seat of a sealed and leak-proof ball valve of the present invention;

[0019] Figure 7 It is a cross-sectional schematic diagram of a shaft sleeve of a sealed and leak-proof ball valve of the present invention;

[0020] Figure 8 It is a cross-sectional schematic diagram of an X-shaped sealing member of a sealed and leak-proof ball valve of the present invention. [Specific implementation method]

[0021] See also Figures 1 to 8 The present invention discloses a sealed and leakproof 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 second sealing member 6, a spring 7 and a valve stem control mechanism 8. The inlet valve body 1 and the outlet valve body 2 form a cavity for accommodating the ball valve 3. 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. The 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 Abutting against the ball valve 3, the other end of the valve seat 4 is provided with a first annular groove 423, and a second sealing member 6 is installed in the first annular groove 423. A plurality of springs 7 are installed in the inlet valve body 1 and the outlet valve body 2 respectively, and the end of the spring 7 is abutted against one side of the second sealing member 6. A valve stem control mechanism 8 is also installed on the inlet valve body 1, and a connecting seat 81, a valve stem shaft 82, a shaft sleeve 83, and an X-shaped sealing member 84 are provided on the valve stem control mechanism 8. The shaft sleeve 83 is sleeved on the outside of the valve stem shaft 82, and 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 80 is installed on the top of the valve stem shaft 82.

[0022] 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, and a first stepped groove 12 is provided on a 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 7 are circumferentially distributed 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 spring holes 13 for installing the spring 7 are installed on the outer ring of the mounting portion 41 at intervals along the axial direction. An annular sealing ring 411, the first annular sealing ring 411 is tightly matched with the first installation cavity 11, a first annular groove 423 is provided at one end of the sealing portion 42 close to the installation portion 41, a first conical surface is provided at the other end of the sealing portion 42, a second annular sealing ring 422 is installed in the first conical surface, the second annular sealing ring 422 is tightly matched with the ball valve 3, a plurality of water channel branches 421 are provided in the sealing portion 42, one end of the water channel branch 421 is communicated with the cavity, and the other end of the water channel branch 421 is communicated with the first annular groove 423.

[0023] Furthermore, 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 provided on the first conical surface of the sealing portion 42. One end of the first skeleton 51 is installed in the second annular groove. 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 wrapped around 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 to achieve a double sealing effect.

[0024] Furthermore, the second sealing component 6 includes a second skeleton 61 and a second sealing body 62. One side of the second skeleton 61 abuts against the end of the spring 7. The other side of the second skeleton 61 is provided with a second sealing body 62. The second sealing body 62 has two symmetrically arranged second sealing lips 621. The two second sealing lips 621 respectively abut against the outer ring and the inner ring of the first annular groove 423.

[0025] Furthermore, the valve stem control mechanism 8 also includes a first sealing ring 85, a second sealing ring 86, a third sealing ring 87 and a bolt 88. The connecting seat 81 has a central axis hole 811 for the valve stem shaft 82 to pass through, and a first stepped mounting cavity 812 for mounting a sleeve 83 is provided above the central axis 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. The first sealing ring 85 is installed between the inner wall of the sleeve 83 and the outer wall of the valve stem shaft 82, and the 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, and a third sealing ring 87 is installed between the lower wall of the limiting plate 831 and the connecting seat 81.

[0026] Furthermore, the shaft sleeve 83 includes a limit plate 831 and a mounting sleeve 832 arranged in sequence from top to bottom, the outer diameter of the limit plate 831 is larger than the outer diameter of the mounting sleeve 832, and a third annular sealing groove 833 is provided at the connection between the lower wall of the limit plate 831 and the mounting sleeve 832, the outer ring of the third sealing groove 833 is a second conical surface with an outer diameter gradually increasing from top to bottom, the third sealing groove 833 is abutted against the third sealing ring 87, the inner wall of the mounting sleeve 832 is provided with a first sealing groove for installing the first sealing ring 85, the outer wall of the mounting sleeve 832 is provided with a second sealing groove for installing the second sealing ring 86, and a plurality of mounting holes 8311 are evenly distributed on the limit plate 831.

[0027] 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.

[0028] Furthermore, the X-shaped seal 84 includes an upper sealing portion 841 and a lower sealing portion 842 symmetrically arranged from top to bottom, and the upper sealing portion 841 and the lower sealing portion 842 respectively have two V-shaped sealing skirts 840, and the driving portion 834 abuts against the upper sealing portion 841. The arrangement of four sealing skirts can achieve a double sealing effect and effectively improve the sealing of the connection.

[0029] 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.

[0030] Working process of the present invention:

[0031] The present invention provides a sealed and leakproof ball valve, wherein 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, and 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 medium pressure in the valve body can be applied to the second sealing member 6 through the water channel branch, and the valve seat 4 is abutted against the side of the ball valve 3 by the reaction force, so as to perform sealing compensation on the first sealing member 5, and further improve the sealing effect. When assembling the valve stem shaft, first insert the valve stem shaft 82 into the connecting seat 81, place the X-shaped sealing member 84 at the bottom of the first stepped installation cavity 812, place the third sealing ring 87 below the third sealing groove 833, 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 connecting 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, the second sealing ring 86, and the third sealing ring 87, so that the sealing performance is reliable and durable. In addition, by tightening the bolt 8, the shaft sleeve 83 can be controlled to be pressed inward. On the one hand, the driving part at the bottom of the shaft sleeve 83 can squeeze the sealing skirt 840 so that the sealing skirt 840 is close to the connecting seat 81 and the valve stem shaft 82. On the other hand, it can squeeze the third sealing ring 87 to further improve the sealing effect.

[0032] 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 sealed and leakproof ball valve, characterized in that: 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 second sealing member (6), a spring (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 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); and a first annular groove (6) is provided at the other end of the valve seat (4). 423), a second sealing member (6) is installed in the first annular groove (423), a plurality of springs (7) are installed in the inlet valve body (1) and the outlet valve body (2), respectively, the end of the spring (7) is in abutment with one side of the second sealing member (6), the inlet valve body (1) is also installed with a valve stem control mechanism (8), the valve stem control mechanism (8) is provided with a connecting seat (81), a valve stem shaft (82), a shaft sleeve (83), and an X-shaped sealing member (84), 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), and the bottom of the shaft sleeve (83) is in contact with the connecting seat (81). An X-shaped sealing member (84) is provided between the connecting seat (81); the bottom of the valve stem shaft (82) is connected to the ball valve (3); and a handle (80) 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); 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; a first annular groove (423) is provided at one end of the sealing portion (42) close to the mounting portion (41); a plurality of water channel branches (421) are provided in the sealing portion (42); one end of the water channel branch (421) is communicated with the cavity; and the other end of the water channel branch (421) is connected to the first annular groove (423). The groove (423) is connected; the first sealing member (5) 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 installed 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 an end of the first frame (51) and a first sealing lip (54) radially expanding outwardly along the axial direction; the sealing bevel body (53) and the first sealing lip (54) are tightly matched with the ball valve (3);The second sealing member (6) comprises a second frame (61) and a second sealing body (62), one side of the second frame (61) is in contact with the end of the spring (7), the other side of the second frame (61) is provided with a second sealing body (62), the second sealing body (62) has two symmetrically arranged second sealing lips (621), the two second sealing lips (621) are respectively in contact with the outer ring and the inner ring of the first annular groove (423); the valve stem control mechanism (8) further comprises a first sealing ring (85), a second sealing ring (86), a third sealing ring (87) and a bolt (88), the connecting seat (81) has a central shaft hole (811) for the valve stem shaft (82) to pass through, the central A first stepped installation cavity (812) for installing a shaft sleeve (83) is provided above the shaft hole (811); the shaft sleeve (83) is connected to the connecting seat (81) via a plurality of bolts (88); the bottom of the shaft sleeve (83) has a driving portion (834) that abuts against the X-shaped sealing member (84); a first sealing ring (85) is installed between the inner wall of the shaft 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 shaft sleeve (83) and the first stepped installation cavity (812); a limiting plate (831) is provided at the top of the shaft sleeve (83); and a third sealing ring (87) is installed between the lower wall of the limiting plate (831) and the connecting seat (81). ; 2. A sealed and leakproof 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 outer diameter of the limiting plate (831) is larger than the outer diameter of the mounting sleeve (832). A third sealing groove (833) in the shape of an annulus is provided at the connection between the lower wall of the limiting plate (831) and the mounting sleeve (832). The outer ring of the third sealing groove (833) is a second conical surface whose outer diameter gradually increases from top to bottom. The third sealing groove (833) is abutted against a third sealing ring (87). 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). The limiting plate (831) is evenly distributed with a plurality of mounting holes (8311).

3. A sealed and leakproof 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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