Multi-sealing corrugated pipe ball valve

Abstract

The utility model discloses a multi-sealing corrugated pipe ball valve which comprises a valve body, a valve element is arranged in the valve body, valve seats are arranged on the left side and the right side of the valve element respectively, sealing rings are arranged on the two valve seats respectively, compression springs are arranged at the side ends of the two valve seats respectively, a cylinder is fixed to the valve body, and a first circular ring block is fastened in the cylinder. A second circular ring block is fastened above the first circular ring block, a valve rod is arranged in the cylinder, a corrugated pipe is installed between the first circular ring block and the second circular ring block, a first O-shaped sealing ring is arranged on the first circular ring block and the second circular ring block, a circular supporting block is arranged above the second circular ring block, and the space between the circular supporting block and the second circular ring block is filled with filler. A threaded section is arranged at the top end of the valve rod, a pulling rod is arranged at the top end of the first base plate, and a nut is arranged at the top end of the pulling rod. A notch is formed in the bottom of the valve element, and a third thrust bearing is installed between the notch and the valve body. Media cannot leak out of the valve rod after long-term use, and the valve is low in maintenance cost and worthy of popularization and application.

Description

Technical Field

[0001] The utility model relates to a ball valve, in particular to a multi-sealed bellows ball valve. Background Art

[0002] A ball valve is a valve whose opening and closing member (ball) is driven by a valve stem and rotates around the valve axis. There are generally manual, pneumatic, or electric ways to open a ball valve. However, no matter how the ball valve is opened, it is necessary to use a power member to drive the valve stem to rotate, and then drive the valve core to rotate, so as to achieve the purpose of opening and closing the ball valve. However, for existing ball valves, the sealing performance is usually only considered to be the quality of the sealing ring on the valve seat. In fact, the sealing performance of the valve stem is also very important. Traditional ball valves are filled with packing at the valve stem to seal and isolate the valve stem from the outside world. However, after long-term use of the valve stem, the packing at the valve stem will wear (the packing at the valve stem is a dynamic seal), and the sealing performance will be reduced. In a high-pressure medium environment, it is easy for the medium to leak from the valve stem, posing a safety hazard.

[0003] Chinese utility model patent CN 203560501 U discloses an improved forged steel fixed pipeline ball valve, which includes a valve body, a fixed shaft, a fixed shaft screw, a ball, a sealing seat, a connector, a valve seat, a DU composite bearing I, a DU composite bearing II, a double stuffing box, a stuffing box screw, a pin, a DU composite bearing III, a connecting plate, a valve stem, a valve body nut, a valve body stud, a valve seat emergency injection valve, a valve stem emergency injection valve, a relief valve, and a connecting plate screw. The valve body is characterized in that the flow channel is cylindrical, the center of which is a cavity, and the upper part is fixedly connected to the double stuffing box. The valve body and the double stuffing box are connected by a stuffing box screw. The double stuffing box is provided with a connecting plate, and the connecting plate is connected to the double stuffing box by a pin and a connecting plate screw. A valve stem is provided in the center of the valve body, and the valve stem passes through the connecting plate and the double stuffing box. A DU composite bearing III is provided between the valve stem and the connecting plate. A ball is installed in the valve body, the top of the ball is connected to the valve stem, and a DU is provided between the valve stem and the double stuffing box. Composite bearing II, DU composite bearing I is provided between the duplex stuffing box and the ball, the valve body is connected to the connector through the valve body nut and valve body stud, a valve seat is provided between the connector and the ball, a sealing seat is provided between the valve seat and the ball, the fixed shaft is connected to the valve body through the fixed shaft screw, and the valve body is provided with a valve seat emergency injection valve, a valve stem emergency injection valve, and a relief valve; the ball valve has poor sealing performance at the valve stem, and the medium is likely to leak from the valve stem after long-term use, posing a safety hazard. Utility Model Content

[0004] The utility model aims to solve the above-mentioned shortcomings of the prior art and provide a multi-seal bellows ball valve with good sealing performance and no leakage from the valve stem area after long-term use, thereby meeting the demand for no leakage during long-term use in a high-pressure medium environment.

[0005] The utility model adopts the following technical solutions to solve its technical problems: this multi-sealed bellows ball valve comprises a valve body, a valve core is arranged in the valve body, valve seats which are plugged into the valve body are arranged on the left and right sides of the valve core, sealing rings which match the spherical surface of the valve core are fixed on the two valve seats, compression springs which respectively drive the two valve seats to press toward the spherical surface of the valve core are installed on the side ends of the two valve seats, a cylindrical barrel is fixed on the valve body, a first circular ring block is fastened in the cylindrical barrel, a second circular ring block is fastened above the first circular ring block, a valve stem which passes through the first circular ring block and the second circular ring block is arranged in the cylindrical barrel, a bellows which is squeezed on the valve stem and the inner wall of the cylindrical barrel is installed between the first circular ring block and the second circular ring block, the inner contours of the first circular ring block and the second circular ring block are aligned with the valve stem A first O-ring is installed between the outer contours, a circular support block fixed on the valve stem is provided above the second circular ring block, filler is filled between the circular support block and the second circular ring block, a top seat is screwed on the top of the cylindrical tube, a first thrust bearing is installed between the top seat and the circular support block, a second thrust bearing is installed on the top of the top seat, a first pad is placed on the top of the second thrust bearing, a threaded section is provided on the top of the valve stem, a bend rod sleeved on the valve stem is provided on the top of the first pad, a second pad is provided on the top of the bend rod, the threaded section is pressed tightly against a nut on the second pad, and a plug inserted into the bend rod is fixed on the first pad and the second pad; a recess is provided at the bottom of the valve core, and a third thrust bearing is installed between the recess and the valve body.The role of the valve seat, sealing ring and compression spring here is to enable the sealing ring to be pressed against the spherical surface of the valve core by the compression spring, so as to prevent the medium from leaking. Moreover, when the sealing ring is worn, the valve seat can be pressed to move by the compression spring, so as to compensate for the position of the sealing ring, thereby increasing the service life of the sealing ring and avoiding the problem of increased maintenance costs caused by frequent replacement of sealing rings. The role of the first circular ring block and the first O-ring here is to play a single seal. The role of the bellows here is to play a multiple seal role, so that the medium cannot leak out through the valve stem. The role of the second circular ring block and the first O-ring here is to play a triple seal role. The role of the packing here is to play a quadruple seal role. The role of the top seat, the first thrust bearing, the second thrust bearing, the first gasket, the threaded section, the second gasket and the nut here is to ensure The valve stem is installed in the cylindrical tube and cannot move longitudinally, but can be rotated with little effort; the function of the valve stem here is to drive the valve core to rotate; the function of the prying rod here is to drive the valve core to rotate with little effort; the function of the nut and the plug here is to ensure that the prying rod is fixed on the valve stem, and when the prying rod rotates, the valve stem is driven by the plug to rotate the whole valve stem, thereby driving the valve core to rotate; the function of the recess and the third thrust bearing here is to support the valve core longitudinally, thereby avoiding excessive weight of the valve core acting on the lower side of the sealing ring, thereby avoiding the sealing ring on the lower side of the sealing ring from wearing too quickly and needing to be replaced frequently, which can greatly increase the service life of the sealing ring and reduce maintenance costs. Moreover, the longitudinal support of the valve core can also greatly reduce the friction resistance encountered by the valve core when it rotates, thereby facilitating the rapid opening and closing operation of the ball valve by the prying rod.

[0006] Further improvement, a first self-lubricating layer is provided on the outer contour of the valve seat. The function of the first self-lubricating layer is to make the valve seat run more smoothly and avoid jamming. The first self-lubricating layer is made of tin bronze.

[0007] To further improve the valve, a dovetail block is fixed to the bottom of the valve seat, a dovetail groove is formed on the valve body to mate with the dovetail block, and a second O-ring is installed on the valve body. The dovetail block, dovetail groove, and second O-ring are used to prevent the medium from coming into contact with the compression spring, thereby preventing the compression spring from corroding too quickly and losing its elasticity. This can greatly extend the service life of the compression spring and avoid the problem of increased operating costs caused by frequent replacement and maintenance.

[0008] As a further improvement, a second self-lubricating layer is provided on the outer contour of the dovetail block. The function of the second self-lubricating layer is to reduce frictional resistance when the valve seat moves, making the movement smoother. The second self-lubricating layer is made of tin bronze.

[0009] As a further improvement, a rubber sleeve is fixed on the lever. The function of the rubber sleeve is to increase the friction on the lever, thereby preventing the lever from slipping and making it easier and more accurate to bend.

[0010] To further improve the system, a limit plate is fixed to the lever, and a pair of fully closed and fully open limit blocks are fixed to the cylinder at a 90° angle. The limit plate, fully closed and fully open limit blocks are used to determine the fully open and fully closed positions of the valve core, preventing the valve core from opening too far or too far.

[0011] The beneficial effects of the utility model are:

[0012] 1) Through the valve seat, sealing ring, and compression spring, the sealing ring can be pressed against the valve core spherical surface by the compression spring, thereby preventing the medium from leaking. Moreover, when the sealing ring is worn, the compression spring can also press the valve seat to move, thereby compensating the position of the sealing ring, thereby increasing the service life of the sealing ring and avoiding the problem of increased maintenance costs caused by frequent replacement of the sealing ring.

[0013] 2) The first annular block and the first O-ring provide a single seal; the bellows provide multiple seals, preventing the medium from leaking out through the valve stem; the second annular block and the first O-ring provide a triple seal; and the packing provides a quadruple seal.

[0014] 3). The valve stem is installed in the cylindrical barrel through the top seat, the first thrust bearing, the second thrust bearing, the first pad, the threaded section, the second pad, and the nut. It cannot move in the longitudinal direction, but can be rotated with less effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The three-dimensional Figure 1 ;

[0016] Figure 2 The three-dimensional Figure 2 ;

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

[0018] Figure 4 for Figure 3 A local enlarged view of area A;

[0019] Figure 5 for Figure 3 A local enlarged view of area B;

[0020] Figure 6 for Figure 3 A local enlarged view of the C region;

[0021] Figure 7 for Figure 3 A local enlarged view of area D.

[0022] Explanation of the reference numerals: valve body 1, dovetail groove 1-1, valve core 2, recess 2-1, valve seat 3, first self-lubricating layer 3-1, dovetail block 3-2, second self-lubricating layer 3-2a, sealing ring 4, compression spring 5, cylindrical tube 6, top seat 6a, first circular ring block 7, second circular ring block 8, valve stem 9, circular support block 9-1, threaded section 9-2, bellows 10, top seat 11, first thrust bearing 12, second thrust bearing 13, first pad 14, bend rod 15, rubber sleeve 15-1, limit plate 15-2, second pad 16, nut 17, plug 18, third thrust bearing 19, second O-ring 20, packing 21. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0025] Referring to the accompanying drawings: This multi-seal bellows ball valve comprises a valve body 1, a valve core 2 is arranged in the valve body 1, valve seats 3 are provided on the left and right sides of the valve core 2 and are plugged into the valve body 1, sealing rings 4 are fixed on the two valve seats 3 that match the spherical surface of the valve core 2, and compression springs 5 ​​are installed on the side ends of the two valve seats 3 to respectively drive the two valve seats 3 to press toward the spherical surface of the valve core 2, a cylindrical tube 6 is fixed on the valve body 1, a first circular ring block 7 is fastened in the cylindrical tube 6, a second circular ring block 8 is fastened above the first circular ring block 7, a valve stem 9 passing through the first circular ring block 7 and the second circular ring block 8 is provided in the cylindrical tube 6, a bellows 10 is installed between the first circular ring block 7 and the second ring block 8 and is squeezed on the valve stem 9 and the inner wall of the cylindrical tube 6, a first O-ring 11 is installed between the inner contours of the first circular ring block 7 and the second ring block 8 and the outer contour of the valve stem 9, and a second O-ring 11 is installed on the upper contour of the second circular ring block 8. A circular support block 9-1 is fixed on the valve stem 9, and a filler 21 is filled between the circular support block 9-1 and the second circular ring block 8. A top seat 6a is screwed on the top of the cylindrical tube 6, and a first thrust bearing 12 is installed between the top seat 6a and the circular support block 9-1. A second thrust bearing 13 is installed on the top of the top seat 6a, and a first pad 14 is placed on the top of the second thrust bearing 13. A threaded section 9-2 is provided on the top of the valve stem 9, and a bend rod 15 sleeved on the valve stem 9 is provided on the top of the first pad 14. A second pad 16 is provided on the top of the bend rod 15, and a nut 17 is threadedly pressed on the second pad 16 at the threaded section 9-2. A plug 18 inserted into the bend rod 15 is fixed on the first pad 14 and the second pad 16. A recess 2-1 is provided at the bottom of the valve core 2, and a third thrust bearing 19 is installed between the recess 2-1 and the valve body 1.

[0026] A first self-lubricating layer 3 - 1 is provided on the outer contour of the valve seat 3 .

[0027] A dovetail block 3 - 2 is fixed to the bottom end of the valve seat 3 , a dovetail groove 1 - 1 for plugging with the dovetail block 3 - 2 is opened on the valve body 1 , and a second O-ring 20 is installed on the valve body 1 .

[0028] A second self-lubricating layer 3-2a is provided on the outer contour of the dovetail block 3-2.

[0029] A rubber sleeve 15 - 1 is fixed on the bend lever 15 .

[0030] A limit plate 15 - 2 is fixed on the bend lever 15 , and a pair of fully closed limit blocks 6 - 1 and fully open limit blocks 6 - 2 arranged at an angle of 90° are fixed on the cylindrical tube 6 .

[0031] The working principle of the present invention is as follows: after the ball valve has been used for a long time, the sealing performance will be reduced, and the high-pressure medium will flow into the outer contour side of the valve core 2. At this time, the first annular block 7 and the first O-ring 11 play a single seal, and the bellows 10 in the squeezed state plays a multiple sealing role on the cylindrical tube 6 and the valve stem 9, so that the medium cannot leak longitudinally. Then, the second annular block 8 and the first O-ring 11 play a triple sealing role, and the packing 21 plays a quadruple sealing role. Therefore, the ball valve under multiple sealing will not leak from the valve stem 9 even after long-term use, and is worthy of promotion and application.

[0032] While the present invention has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A multi-seal bellows ball valve, comprising a valve body (1), characterized in that: A valve core (2) is provided in the valve body (1), and valve seats (3) are provided on the left and right sides of the valve core (2) and are plugged into the valve body (1). A sealing ring (4) that matches the spherical surface of the valve core (2) is fixed on the two valve seats (3), and compression springs (5) are installed on the side ends of the two valve seats (3) to respectively drive the two valve seats (3) to press toward the spherical surface of the valve core (2). A cylindrical barrel (6) is fixed on the valve body (1), and a first annular block is fastened in the cylindrical barrel (6). (7), a second circular ring block (8) is fastened above the first circular ring block (7), a valve stem (9) passing through the first circular ring block (7) and the second circular ring block (8) is provided in the cylindrical tube (6), a bellows (10) is installed between the first circular ring block (7) and the second circular ring block (8) and is squeezed on the valve stem (9) and the inner wall of the cylindrical tube (6), and a first O-ring (11) is installed between the inner contours of the first circular ring block (7) and the second circular ring block (8) and the outer contour of the valve stem (9) A circular support block (9-1) fixed on the valve stem (9) is provided above the second circular ring block (8), a filler (21) is filled between the circular support block (9-1) and the second circular ring block (8), a top seat (6a) is screwed onto the top end of the cylindrical tube (6), a first thrust bearing (12) is installed between the top seat (6a) and the circular support block (9-1), a second thrust bearing (13) is installed on the top end of the top seat (6a), and the top end of the second thrust bearing (13) is placed on the top end of the cylindrical tube (6). A first pad (14) is placed, a threaded section (9-2) is provided at the top of the valve stem (9), a bend rod (15) sleeved on the valve stem (9) is provided at the top of the first pad (14), a second pad (16) is provided at the top of the bend rod (15), a nut (17) at the second pad (16) is threadedly pressed on the threaded section (9-2), and a plug (18) plugged into the bend rod (15) is fixed on both the first pad (14) and the second pad (16); A recess (2-1) is provided at the bottom of the valve core (2), and a third thrust bearing (19) is installed between the recess (2-1) and the valve body (1).

2. The multi-seal bellows ball valve according to claim 1, characterized in that: A first self-lubricating layer (3-1) is provided on the outer contour of the valve seat (3).

3. The multi-seal bellows ball valve according to claim 1, characterized in that: A dovetail block (3-2) is fixed to the bottom end of the valve seat (3), a dovetail groove (1-1) is formed on the valve body (1) and is plugged into the dovetail block (3-2), and a second O-ring (20) is installed on the valve body (1).

4. The multi-seal bellows ball valve according to claim 3, characterized in that: A second self-lubricating layer (3-2a) is provided on the outer contour of the dovetail block (3-2).

5. The multi-seal bellows ball valve according to claim 1, characterized in that: A rubber sleeve (15-1) is fixed on the bend lever (15).

6. The multi-seal bellows ball valve according to claim 1, characterized in that: A limit plate (15-2) is fixed on the bend lever (15), and a pair of fully closed limit blocks (6-1) and fully open limit blocks (6-2) arranged at a 90° angle are fixed on the cylindrical tube (6).

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