A straight-through anti-wear throttle valve

Abstract

The present invention discloses a straight-through anti-wear throttle valve, characterized in that it comprises a valve body, a valve cover, a valve stem, a bearing seat, a valve stem nut, a hand wheel, a valve core, and a valve seat, wherein the valve body has an air inlet and an air outlet on the left and right sides respectively, and the valve body has a valve cavity and a vertical main channel from top to bottom in the middle, wherein the air inlet is connected to the air outlet through the vertical main channel and the valve cavity in sequence, and a vertically movable sliding sleeve is arranged in the vertical main channel, wherein the sliding sleeve has a central axial hole that passes upward, and the outer circular side surface of the sliding sleeve has a strip hole corresponding to the air inlet, and the upper part of the sliding sleeve has a shaft neck section, which is located on the inner side of the valve seat, and a valve seat sliding sleeve seal is arranged between the shaft neck section and the inner side wall of the valve seat, and when the valve core moves up and the valve is opened, the sliding sleeve moves up. The beneficial effects of the present invention include: small occupied volume, good sealing performance, easy disassembly and assembly, and protection of the valve seat sealing surface from being eroded.

Description

Technical Field

[0001] The invention relates to the field of throttle valves, in particular to a straight-through anti-wear throttle valve. Background Art

[0002] The throttle valve commonly used in the field of shale gas production is an angle throttle valve, which requires a 90° turn with the pipeline for installation, is bulky, and has a poor overall effect when installed together with other valves in the pipeline. The existing throttle valve mainly achieves the purpose of throttling or shutoff by contact between the valve core and the valve seat, but due to the long-term scouring of the sealing surface of the valve seat outlet by the sand-entrained gas, this part is severely worn, which leads to the inability to achieve complete sealing and isolation at this part, so that the throttle valve can only achieve throttling, and the throttling accuracy is difficult to control, and the shutoff function cannot be achieved. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present invention provides a straight-through anti-wear throttle valve, which has a straight-through structure that is easy to install, occupies a small volume, and has a valve seat with good wear resistance and good sealing performance.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A straight-through anti-wear throttle valve, characterized in that it includes a valve body, a valve cover, a valve stem, a bearing seat, a valve stem nut, a handwheel, a valve core, a valve seat, and a sliding sleeve, wherein the left and right sides of the valve body are respectively provided with an air inlet and an air outlet, and the middle of the valve body is provided with a valve cavity and a vertical main channel from top to bottom, the air inlet is communicated with the air outlet through the vertical main channel and the valve cavity in sequence, the valve seat is arranged at the bottom of the valve cavity and is coaxially arranged with the vertical main channel, the valve cover is covered at the upper end of the valve body to close the valve cavity, the lower part of the valve stem passes through the valve cover and extends into the valve cavity, the valve core is connected to the lower end of the valve stem, the lower part of the valve core has a conical surface that cooperates with the valve seat to achieve sealing, the bearing seat is arranged on the valve cover, the valve stem nut is rotatably matched with the bearing seat through a bearing, the valve stem nut is threadedly matched with the upper part of the valve stem, and the handwheel is sleeved on the valve stem nut; a The closure of the valve body is provided with a valve core, and the closure of the valve body is provided with a valve core seal, and the closure of the valve body is provided with a valve core seal.

[0006] Furthermore, the wall thickness of the lower portion of the sliding sleeve is greater than the wall thickness of the upper journal section, and there is a movable gap between the sliding sleeve and the vertical main channel.

[0007] Furthermore, the vertical main channel passes through the valve body downward, and a plug for sealing the lower end of the vertical main channel is provided at the bottom of the valve body, and a gap for gas to pass through is provided between the upper end of the plug and the lower end of the sliding sleeve.

[0008] Furthermore, a plug seal is provided between the plug and the valve body.

[0009] Furthermore, the bottom of the sliding sleeve has a threaded hole.

[0010] Furthermore, a positioning pin is provided at the lower portion of the valve seat for limiting the circumferential rotation of the sliding sleeve.

[0011] Furthermore, a valve seat and valve body seal is provided between the lower portion of the valve seat and the valve body; a valve sleeve and valve body seal is provided between the outer peripheral surface of the valve sleeve and the valve body, and a valve cover seal is provided between the upper end surface of the valve sleeve and the valve cover.

[0012] Furthermore, a combined sealing ring is arranged between the upper part of the valve cover and the valve stem, a sealing pressure cap for pressing the combined sealing ring is arranged at the upper end of the combined sealing ring, the sealing pressure cap is threadedly connected to the valve cover, and a sealing spacer ring is also arranged between the sealing pressure cap and the combined sealing ring.

[0013] Furthermore, the bearing seat is sleeved on the outer side of the upper part of the valve cover, and the bearing seat is threadedly connected to the valve cover. The bearing seat is also provided with radially arranged locking screws that are fastened to the valve cover.

[0014] Furthermore, a dust ring is arranged between the valve stem nut and the upper end of the bearing seat, and a protective cover for limiting the position of the hand wheel is arranged on the upper end of the valve cover nut.

[0015] The beneficial effects of the present invention include: adopting a straight-through structure design, occupying a small volume when in use, utilizing pipeline pressure to assist sealing, achieving the best effect, having good sealing performance, and being easy to disassemble and assemble; when throttling and draining sewage, utilizing the sliding sleeve to move up and down to protect the valve seat sealing surface from being eroded. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 yes Figure 1 A partial enlarged view of . DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0019] A kind of Figure 1 -The straight-through anti-wear throttle valve shown in the figure comprises a valve body 3, a valve cover 8, a valve stem 14, a bearing seat 21, a valve stem nut 17, a hand wheel 16, a valve core 6, and a valve seat 4. The valve body 3 has an air inlet 30 and an air outlet 31 on the left and right sides respectively; the valve body 3 has a valve cavity and a vertical main channel from top to bottom in the middle. The air inlet 30 is connected to the air outlet 31 through the vertical main channel and the valve cavity in turn. The valve seat 4 is arranged at the bottom of the valve cavity and is coaxially arranged with the vertical main channel. The valve cover 8 covers the upper end of the valve body 3 and is fastened by bolts 10 to close the valve cavity. The lower part of the valve stem 14 passes through the valve cover 8 and extends into the valve cavity. The valve core 6 is connected to the lower end of the valve stem 14, and the lower part of the valve core 6 has a conical surface that cooperates with the valve seat 8 to achieve sealing. The valve stem 14 drives the valve core 6 to move up and down to achieve the opening and closing of the valve.

[0020] The bearing seat 21 is sleeved on the outer side of the upper part of the valve cover 8, and the bearing seat 21 is threadedly connected to the valve cover 8. The bearing seat 21 is also provided with a radially arranged locking screw 22 that is tightly connected to the valve cover 8, and its function is to prevent the bearing seat 21 and the valve cover 8 from rotating relative to each other after being installed in place. The valve stem nut 17 is arranged on the inner side of the bearing seat 21. The valve stem nut 17 rotates with the bearing seat 21 through two bearings 19 arranged at intervals up and down, that is, the valve stem nut 17 can achieve circular rotation relative to the bearing seat 21. An oil cup 22 facing the bearing 19 is also provided on the bearing seat 21 to add lubricating oil to the bearing 19. The valve stem nut 17 is threadedly matched with the upper part of the valve stem 14, that is, the rotation of the valve stem nut 17 can drive the valve stem 14 to move axially. The handwheel 16 is sleeved on the valve stem nut 17 to drive the valve stem nut 17 to rotate.

[0021] Furthermore, in this embodiment, a vertically movable sleeve 29 is provided in the vertical main channel, and the sleeve 29 has a central axial hole that penetrates upwards, which is used to communicate with the valve cavity; the outer circumferential side of the sleeve 29 has a strip hole corresponding to the air inlet 30, which is used to connect the central axial hole and the air inlet 30, so that an air flow channel is provided on the sleeve 29. The upper part of the sleeve 29 has a shaft neck section, which is located inside the valve seat 4, and a valve seat sleeve seal 27 is provided between the shaft neck section and the inner side wall of the valve seat 4 for sealing. A movable gap is left between the lower end of the valve seat 4 and the shaft shoulder of the sleeve 29. The wall thickness of the lower part of the sleeve 29 is greater than that of the upper shaft neck section. There is a movable gap between the sleeve 29 and the vertical main channel. Therefore, when the gas is connected to the air inlet 30 and when the valve core 6 moves up to open the valve, the sleeve 29 automatically moves up due to the pressure difference generated by the area difference between the upper and lower end surfaces, so that the upper end surface of the sleeve 29 exceeds the sealing surface of the valve seat 4; therefore, the sleeve 29 protects the sealing surface of the slide seat 4 from being eroded, thereby achieving the purpose of long-term use.

[0022] In this embodiment, a valve sleeve 5 for pressing the valve seat 4 is provided in the valve cavity, the upper end of the valve sleeve 5 is limited on the valve cover 8, the valve core 6 is movably provided in the valve sleeve 5, and a valve sleeve and valve core seal 25 is provided between the valve core 6 and the inner wall of the valve sleeve 5. A through hole connected to the valve cavity is provided on the outer circular side wall of the lower part of the valve sleeve 5, so that the gas passing through the valve seat 4 can enter the valve cavity. A pressure-assisted sealing cavity 33 is provided between the upper end of the valve core 6 and the valve cover 8 in the valve sleeve 5, and a valve core small hole 32 connected to the pressure-assisted sealing cavity 33 is provided at the lower end of the valve core 6. When the valve core 6 moves downward, the sliding sleeve 29 is pushed open, and the valve core 6 is completely in contact with the sealing surface of the valve seat 4, so that the valve is closed. After closing, the gas pressure of the upstream air inlet 30 enters the pressure-assisted sealing cavity 33 through the valve core small hole 32, which plays a role of pressure-assisted sealing and achieves a good sealing effect.

[0023] Furthermore, the vertical main channel runs through the valve body 3 downward, and a plug 1 is provided at the bottom of the valve body 3 to block the lower end of the vertical main channel. There is a gap between the upper end of the plug 1 and the lower end of the sleeve 29 for gas to pass through. This balances the air pressure between the lower end of the sleeve 29 and the air inlet 30, so that the gas acts on the bottom surface of the sleeve 29 through the area difference to exert an upward thrust on the sleeve 29. A plug seal 2 is provided between the plug 1 and the valve body 3 to prevent air leakage. The bottom of the sleeve 29 has a threaded hole, which facilitates the removal of the plug 1 and the smooth removal and replacement of the sleeve 29 from the vertical main channel by screws.

[0024] In order to limit the circumferential rotation of the sliding sleeve 29 in the vertical main channel, a positioning pin 28 is provided at the lower part of the valve seat 4.

[0025] In order to make the throttle valve of this embodiment seal well. A valve seat valve body seal 26 is arranged between the lower part of the valve seat 4 and the valve body 3; a valve sleeve valve body seal 24 is arranged between the outer peripheral surface of the valve sleeve 5 and the valve body 3, and a valve cover seal 23 is arranged between the upper end surface of the valve sleeve 5 and the valve cover 8. A combined sealing ring 11 is arranged between the upper part of the valve cover 8 and the valve stem 14, and a sealing pressure cap 13 is arranged on the upper end of the combined sealing ring 11 to press the combined sealing ring 11. The sealing pressure cap 13 is threadedly connected to the valve cover 8, and a sealing spacer ring 12 is also arranged between the sealing pressure cap 13 and the combined sealing ring 11. A dust ring 18 is arranged between the valve stem nut 17 and the upper end of the bearing seat 21, and a protective cover 15 of a limited position hand wheel 16 is arranged on the upper end of the valve cover nut 17.

[0026] To further increase the wear resistance, the valve seat 4, valve core 6 and sliding sleeve 29 in this embodiment are all made of martensitic stainless steel. The sealing surfaces of the valve seat 4 and valve core 6 are surface hardened.

[0027] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A straight-through anti-wear throttle valve, characterized in that: The valve body (3) comprises a valve body (3), a valve cover (8), a valve stem (14), a bearing seat (21), a valve stem nut (17), a hand wheel (16), a valve core (6), and a valve seat (4). The valve body (3) has an air inlet (30) and an air outlet (31) on its left and right sides respectively. The valve body (3) has a valve cavity and a vertical main channel in the middle from top to bottom. The air inlet (30) is connected to the air outlet (31) through the vertical main channel and the valve cavity in sequence. The valve seat (4) is provided at the bottom of the valve cavity and is coaxially arranged with the vertical main channel. The valve cover (8) is covered on the upper end of the valve body (3) to close the valve cavity. The lower part of the valve stem (14) passes through the valve cover (8) and extends into the valve cavity. The valve core (6) is connected to the lower end of the valve stem (14); the lower part of the valve core (6) has a conical surface that cooperates with the valve seat (4) to achieve sealing; the bearing seat (21) is arranged on the valve cover (8); the valve stem nut (17) is rotatably matched with the bearing seat (21) through a bearing (19); the valve stem nut (17) is matched with the upper thread of the valve stem (14); the hand wheel (16) is sleeved on the valve stem nut (17); a vertically movable sliding sleeve (29) is arranged in the vertical main channel; the wall thickness of the lower part of the sliding sleeve (29) is greater than the wall thickness of the upper shaft neck section; there is a movable gap between the sliding sleeve (29) and the vertical main channel; the sliding sleeve (29) has a The sliding sleeve (29) has a central axis hole extending therethrough, the outer circular side surface of the sliding sleeve (29) has a strip hole corresponding to the air inlet (30), the upper part of the sliding sleeve (29) has a shaft neck section, the shaft neck section is located on the inner side of the valve seat (4), a valve seat sliding sleeve seal (27) is provided between the shaft neck section and the inner side wall of the valve seat (4), a movable gap is left between the lower end of the valve seat (4) and the shaft shoulder of the sliding sleeve (29), and when the valve core (6) moves up to open the valve, the sliding sleeve (29) moves up so that the upper end surface of the sliding sleeve (29) exceeds the sealing surface of the valve seat (4); a valve sleeve (5) for pressing the valve seat (4) is provided in the valve cavity, and the upper end limit of the valve sleeve (5) is located on the valve cover (8). The valve core (6) is movably arranged in the valve sleeve (5), a valve sleeve valve core seal (25) is arranged between the valve core (6) and the inner wall of the valve sleeve (5), a through hole communicating with the valve cavity is provided on the outer circular side wall of the lower part of the valve sleeve (5), a pressure auxiliary sealing cavity (33) is provided between the upper end of the valve core (6) and the valve cover (8), and a valve core small hole (32) communicating with the pressure auxiliary sealing cavity (33) is provided at the lower end of the valve core (6), the vertical main channel passes through the valve body (3) downward, and a plug (1) is provided at the bottom of the valve body (3) for blocking the lower end of the vertical main channel, and a gap is provided between the upper end of the plug (1) and the lower end of the sliding sleeve (29) for gas to pass through.

2. A straight-through anti-wear throttle valve according to claim 1, characterized in that: A plug seal (2) is provided between the plug (1) and the valve body (3).

3. A straight-through anti-wear throttle valve according to claim 1, characterized in that: The bottom of the sliding sleeve (29) is provided with a threaded hole.

4. A straight-through anti-wear throttle valve according to claim 1, characterized in that: A positioning pin (28) is provided at the lower portion of the valve seat (4) for limiting the circumferential rotation of the sliding sleeve (29).

5. The straight-through anti-wear throttle valve according to claim 1, characterized in that: A valve seat and valve body seal (26) is provided between the lower portion of the valve seat (4) and the valve body (3); a valve sleeve and valve body seal (24) is provided between the outer peripheral surface of the valve sleeve (5) and the valve body (3); and a valve cover seal (23) is provided between the upper end surface of the valve sleeve (5) and the valve cover (8).

6. A straight-through anti-wear throttle valve according to claim 1, characterized in that: A combined sealing ring (11) is arranged between the upper part of the valve cover (8) and the valve stem (14); a sealing pressure cap (13) for pressing the combined sealing ring (11) is arranged at the upper end of the combined sealing ring (11); the sealing pressure cap (13) is threadedly connected to the valve cover (8); and a sealing spacer ring (12) is also arranged between the sealing pressure cap (13) and the combined sealing ring (11).

7. The straight-through anti-wear throttle valve according to claim 1, characterized in that: The bearing seat (21) is sleeved on the outer side of the upper part of the valve cover (8), and the bearing seat (21) is threadedly connected to the valve cover (8). The bearing seat (21) is also provided with radially arranged locking screws (22) for fastening with the valve cover (8).

8. The straight-through anti-wear throttle valve according to claim 1, characterized in that: A dust ring (18) is provided between the valve stem nut (17) and the upper end of the bearing seat (21), and a protective cover (15) for limiting the position of the hand wheel (16) is provided at the upper end of the valve stem nut (17).

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