A wear-resistant shear valve with flushing function

Abstract

The present invention relates to a wear-resistant shear valve with a flushing function, comprising a valve body, wherein a gate plate, a movable valve seat and a protective plate are arranged in the valve body, the gate plate has an open position and a closed position, and when the gate plate is displaced from the open position to the closed position, the gate plate flow channel hole and the protective plates on both sides form a gate plate flow channel cavity. The wear-resistant shear valve also includes a flushing device for flushing the medium coking in the gate plate flow channel cavity when the gate plate is displaced from the open position to the closed position. The flushing device includes a flushing channel arranged on at least one protective plate, and the oil outlet of the flushing channel forms a flushing port on the inner side surface of the protective plate. When the gate plate is displaced from the open position to the closed position, the gate plate flow channel cavity will be connected to the flushing port, and the flushing medium in the flushing pipe will flush the medium coking in the gate plate flow channel hole, and most of the medium coking will be flushed away. The problem of medium coking causing blockage of the gate plate flow channel hole and wear between the protective plate and the gate plate existing in the prior art is solved.

Description

Technical Field

[0001] The invention relates to the field of shear valves, and in particular to a wear-resistant shear valve with a flushing function. Background Art

[0002] At present, shear valves are a type of gate valves, and are generally used in pipeline systems under harsh working conditions, such as viscous slurries, solid-liquid two-phase suspensions, etc. in the chemical, electric power, and environmental protection industries. The structure of the shear valve is disclosed in the Chinese utility model patent with the authorization announcement number CN206496015 U, which discloses a regulating valve and its gate, including a valve body, a gate, and a movable valve seat. The valve body has a valve body flow channel, and the gate has a gate flow channel hole corresponding to the valve body flow channel. Both sides of the gate have gate sealing surfaces. Protective plates are arranged on both sides of the gate inside the valve body. The protective plates are always sealed with the two sides of the gate. The medium is blocked in the gate flow channel hole by the protective plates on both sides, and the medium will not enter the sealed chamber. However, the following disadvantages still exist: the medium will coke on the hole wall of the gate flow channel hole, and when the gate moves upward from the open position to the closed position, the medium in the gate flow channel hole will be carried into the sealed gate flow channel cavity composed of the protective plate and the gate. The medium in the gate flow channel cavity is easy to coke and block the gate flow channel hole, and it is also easy to cause wear on the protective plate and the gate sealing surface, which will aggravate the internal leakage of the valve and thus affect the service life of the valve. Summary of the invention

[0003] The purpose of the present invention is to provide a wear-resistant shear valve with flushing function to solve the problems in the prior art that the medium in the gate flow channel hole is easy to coke, resulting in clogging of the gate and wear of the protective plate and the gate sealing surface.

[0004] To achieve the above-mentioned purpose, a wear-resistant shear valve with a flushing function of the present invention adopts the following technical scheme: a wear-resistant shear valve with a flushing function, comprising a valve body, a gate plate and a movable valve seat are arranged in the valve body, protective plates are arranged on both sides of the gate plate in the valve body, the valve body has a valve body flow channel, and gate plate flow channel holes and gate plate blocking sections are arranged in sequence in the upper and lower directions of the gate plate. The gate plate has an open position in which the gate plate flow channel hole is connected to the valve body flow channel, and the gate plate also has a closed position in which the gate plate blocking section blocks the valve body flow channel. During the process of the gate plate moving from the open position to the closed position, the gate plate flow channel hole and the protective plates on both sides form a gate plate flow channel cavity. The wear-resistant shear valve also includes a flushing device for flushing the medium coking in the gate plate flow channel cavity when the gate plate moves from the open position to the closed position. The flushing device includes a flushing channel arranged on at least one protective plate, the oil inlet of the flushing channel is connected to a flushing pipe extending out of the valve body, and the oil outlet of the flushing channel forms a flushing port on the inner side surface of the protective plate. During the process of the gate plate moving from the open position to the closed position, the flushing port is connected to the gate plate flow channel cavity to achieve flushing.

[0005] A spring seat is arranged inside the valve body between the axial end of the movable valve seat and the inner wall of the valve body, a spring seat installation groove for installing the spring seat is arranged on the inner wall of the valve body, a first sealing structure is arranged between the spring seat and the groove wall of the installation groove, and an elastic second sealing structure with a compensation function is arranged between the axial end of the movable valve seat and the corresponding spring seat.

[0006] The second sealing structure includes an annular groove arranged on the end face of the spring seat, the spring seat has a central channel connected to the valve body flow channel, an annular guide wall is arranged on the axial end face of the movable valve seat and cooperates with the annular groove for guiding movement, a first spring, a sealing ring press-fitted with the annular guide wall and a gasket arranged between the first spring and the sealing ring are arranged in the annular groove.

[0007] The axial end surface of the movable valve seat is provided with more than two spring mounting holes spaced apart in the circumferential direction, a second spring is provided in the spring mounting hole, and an end of the second spring is used for axial pressing against the spring seat.

[0008] Beneficial effects of the present invention: During the process of the gate plate moving from the open position to the closed position, the gate plate flow channel cavity will be connected to the flushing port, and the flushing medium in the flushing pipe will flush the medium coke in the gate plate flow channel hole, flushing away most of the medium coke. At the same time, when the gate plate is in the closed position, the flushing port is connected to the gate plate flow channel hole, and the flushing medium will enter the gate plate flow channel cavity to soak the medium coke that has not been flushed away, softening the medium coke on the hole wall and causing it to fall off. When the gate plate is opened next time, the material in the gate plate flow channel cavity can be brought down and flowed away with the flowing medium. The problem of the gate plate flow channel hole being easily blocked by the medium coke in the prior art is solved, and the problem of wear of the protective plate and the gate plate sealing surface due to medium coking is also solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of an embodiment of a wear-resistant shear valve with flushing function of the present invention;

[0010] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0011] Figure 3 yes Figure 2 A partial enlarged view of point B in the middle. DETAILED DESCRIPTION

[0012] An embodiment of a wear-resistant shear valve with flushing function of the present invention is as follows Figure 1-Figure 3As shown, it includes a valve body 1, in which a gate plate and a movable valve seat 2 are arranged, and a protective plate 3 and a protective cover 14 are arranged on both sides of the gate plate in the valve body. The valve body has a valve body flow channel 4, and the gate plate is provided with a gate flow channel hole 5 and a gate sealing section 6 in the up and down directions. The protective plate and the movable valve seat are separately arranged, and the two are sealed and connected. The gate plate has an open position in which the gate flow channel hole is connected to the valve body flow channel, and the gate plate also has a closed position in which the gate sealing section blocks the valve body flow channel. In the process of the gate plate moving from the open position to the closed position, the gate flow channel hole and the protective plates on both sides form a gate flow channel cavity.

[0013] The wear-resistant shear valve also includes a flushing device for flushing the coking medium in the gate flow channel cavity when the gate moves from the open position to the closed position. The flushing device includes a flushing channel 7 arranged on a protective plate, and the oil inlet of the flushing channel is connected to a flushing pipe 9 extending out of the valve body, and a check valve 10 and a stop valve 11 are arranged on the flushing pipe. The oil outlet of the flushing channel forms a flushing port 8 on the inner side of the protective plate. When the gate moves from the open position to the closed position, the flushing port is connected to the gate flow channel cavity to achieve flushing. In this embodiment, the flushing medium is heat transfer oil.

[0014] A spring seat 12 is arranged inside the valve body between the axial end of the movable valve seat and the inner wall of the valve body, and a spring seat installation groove for the spring seat to be installed is arranged on the inner wall of the valve body. A first sealing structure 15 is arranged between the spring seat and the groove wall of the installation groove. The first sealing structure adopts end face sealing, and the first sealing structure includes a sealing ring arranged on the circumferential end face of the spring seat. An elastic second sealing structure with a compensation function is arranged between the axial end of the movable valve seat and the corresponding spring seat. The second sealing structure includes an annular groove 16 arranged on the end face of the spring seat, and the spring seat has a central channel 13 connected to the flow channel of the valve body. An annular guide wall 20 is arranged on the axial end face of the movable valve seat to guide the movement of the annular groove. A first spring 17, a sealing ring 18 pressed against the annular guide wall, and a gasket 19 arranged between the first spring and the sealing ring are arranged in the annular groove. The first spring provides a preload, and can automatically compensate under the action of the first spring after the sealing ring is worn, thereby ensuring the sealing performance. At the same time, the sealing ring and the gasket can prevent the medium from contacting the first spring, ensuring the elasticity of the first spring, thereby extending the service life of the valve. Four spring mounting holes 21 are arranged at intervals along the circumferential direction on the axial end surface of the movable valve seat, and a second spring 22 is arranged in the spring mounting hole. The end of the second spring is used for axial pressing against the spring seat.

[0015] When the gate is in use, the gate flow channel cavity will be connected to the flushing port during the process of the gate moving from the open position to the closed position, and the flushing medium in the flushing pipe will flush the medium coke in the gate flow channel hole, flushing away most of the medium coke. At the same time, when the gate is in the closed position, the flushing port is connected to the gate flow channel hole, and the flushing medium will soak the medium coke that has not been flushed away in the gate flow channel cavity, softening the medium coke on the hole wall and falling off. When the gate is opened next time, the material in the gate flow channel cavity can be brought down and flowed away with the flowing medium.

[0016] In other embodiments of the present invention, the number of spring mounting holes on the movable valve seat can be adjusted according to actual needs, for example, 2 or 3 and evenly distributed along the circumference; the protective plate can also be integrally formed with the movable valve seat.

Claims

1. A wear-resistant shear valve with flushing function, comprising a valve body, a gate and a movable valve seat are arranged in the valve body, protective plates are arranged on both sides of the gate in the valve body, the valve body has a valve body flow channel, gate flow channel holes and gate blocking sections are arranged in sequence in the upper and lower directions of the gate, the gate has an open position in which the gate flow channel hole is connected to the valve body flow channel, and the gate also has a closed position in which the gate blocking section blocks the valve body flow channel. When the gate moves from the open position to the closed position, the gate flow channel hole and the protective plates on both sides form a gate flow channel cavity, characterized in that: The wear-resistant shear valve also includes a flushing device for flushing the medium coke in the gate plate flow channel cavity when the gate plate is displaced from the open position to the closed position. The flushing device includes a flushing channel arranged on at least one protective plate, the oil inlet of the flushing channel is connected to a flushing pipe extending out of the valve body, and the oil outlet of the flushing channel forms a flushing port on the inner side surface of the protective plate. When the gate plate is displaced from the open position to the closed position, the flushing port is connected to the gate plate flow channel cavity to achieve flushing; when the gate plate is displaced from the open position to the closed position, the gate plate flow channel cavity is connected to the flushing port, and the flushing medium in the flushing pipe will flush the medium coke in the gate plate flow channel hole, and flush most of the medium coke; when the gate plate is in the closed position, the flushing port is connected to the gate plate flow channel hole, and the flushing medium will enter the gate plate flow channel cavity to soak the medium coke that has not been flushed away, and soften the medium coke on the hole wall and drop it; when the gate plate is opened next time, the material in the gate plate flow channel cavity can be brought down and flowed away with the flowing medium.

2. The wear-resistant shear valve with flushing function according to claim 1, characterized in that: A spring seat is arranged inside the valve body between the axial end of the movable valve seat and the inner wall of the valve body, a spring seat installation groove for installing the spring seat is arranged on the inner wall of the valve body, a first sealing structure is arranged between the spring seat and the groove wall of the installation groove, and an elastic second sealing structure with a compensation function is arranged between the axial end of the movable valve seat and the corresponding spring seat.

3. The wear-resistant shear valve with flushing function according to claim 2, characterized in that: The second sealing structure includes an annular groove arranged on the end face of the spring seat, the spring seat has a central channel connected to the valve body flow channel, an annular guide wall is arranged on the axial end face of the movable valve seat and cooperates with the annular groove for guiding movement, a first spring, a sealing ring press-fitted with the annular guide wall and a gasket arranged between the first spring and the sealing ring are arranged in the annular groove.

4. The wear-resistant shear valve with flushing function according to claim 3, characterized in that: The axial end surface of the movable valve seat is provided with more than two spring mounting holes spaced apart in the circumferential direction, a second spring is provided in the spring mounting hole, and an end of the second spring is used for axial pressing against the spring seat.

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