Wedge-shaped throttle valve seat

Abstract

The wedge-shaped throttle valve seat comprises a fixing seat and two limiting rods which are symmetrically arranged in two valve body matching holes of the wedge-shaped throttle valve respectively, a center hole is axially formed in the center of the fixing seat, L-shaped grooves are formed in the outer surfaces of the two opposite sides of the fixing seat, the directions of the two L-shaped grooves are consistent, balls are embedded in one ends of the two limiting rods, and the balls are embedded in the limiting rods. One end of each compression spring is fixedly connected with the inner hole bottom of the valve body matching hole, the balls and the L-shaped grooves form a kinematic pair, and a special-shaped support used for supporting a valve element of the wedge-shaped throttling valve is arranged at the top end of the fixing base. The wedge-shaped throttle valve seat is mainly used for solving the problems that an existing split type valve seat is difficult to assemble and disassemble, the machining requirement is high, and a valve element loses efficacy due to vibration.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas equipment manufacturing, and in particular relates to a wedge-shaped throttle valve seat. Background Art

[0002] As a key well control device, the wedge-shaped throttle valve controls flow and pressure by adjusting the relative opening between the wedge-shaped valve core and the valve seat, thereby changing the flow area. In actual use, due to the high-pressure, high-flow mixed flow containing solid particles, the wedge-shaped throttle valve is prone to erosion wear and vibration fatigue failure in the valve seat, valve core, and valve body. To improve these issues, a split-type carbide valve seat is currently used to cover the high-speed flow area. However, the following problems also exist during actual processing and use: the threaded connection between the valve seat and the valve body cavity requires special tooling to install or remove the valve seat through the valve stem hole and buffer cavity, and the valve body requires deep-hole thread processing; the split-type inner and outer valve seats require dimensional tolerance adjustment before hot-installation; the valve core and valve seat support have a small contact area, which is susceptible to the dual effects of high-pressure, high-speed backflow and the impact of the front inlet fluid, and is prone to fatigue failure under the alternating vibration load. Summary of the Invention

[0003] The purpose of the present invention is to provide a wedge-shaped throttle valve seat, which solves the problems in the prior art of difficult assembly and disassembly and small supporting contact area between the valve core and the valve seat leading to valve core vibration failure.

[0004] The technical solution adopted by the present invention is that the wedge-shaped throttle valve seat includes a fixed seat and two limit rods symmetrically arranged in the two valve body matching holes of the wedge-shaped throttle valve. A center hole is axially opened at the center position of the fixed seat, and L-shaped grooves are opened on the outer surfaces of the two opposite sides of the fixed seat. The two L-shaped grooves have the same direction. One end of the two limit rods is inlaid with a ball, and the other end is connected to a compression spring. One end of the compression spring is fixedly connected to the bottom of the inner hole of the valve body matching hole. The ball and the L-shaped groove form a moving pair. A special-shaped support for supporting the valve core of the wedge-shaped throttle valve is provided at the top of the fixed seat.

[0005] The present invention is also characterized in that:

[0006] The fixed seat is an integral cylindrical structure processed with different outer diameter steps. The reducing steps of the small outer diameter section and the large outer diameter section of the cylinder are reducing shoulders, which are used to locate the fixed seat in the axial position; the special-shaped support protrusion is arranged at the end of the small outer diameter section of the cylinder, and the outer surface of the large outer diameter section of the cylinder is provided with a sealing groove along the circumferential direction, and a guide belt is provided in the sealing groove; when the ball moves to the corner point of the L-shaped groove, the reducing shoulder and the valve body limit of the wedge-shaped throttle valve cannot be further inserted, and the guide belt is just immersed in the valve body.

[0007] The special-shaped support is a special-shaped protrusion structure that matches the end of the small outer diameter section of the fixed seat cylinder, and the protrusion end face is a trigonometric function surface covering 180 degrees of the circumference.

[0008] The outer circumference of the part of the cylinder with large outer diameter extending out of the valve body is symmetrically provided with flat squares.

[0009] The flat square is also provided with a mounting through hole.

[0010] A groove is provided at one end of the limiting rod and a boss is provided at the other end. The movable end of the compression spring is sleeved on the outer periphery of the boss, the stationary end of the compression spring abuts against the inner bottom of the matching hole of the valve body, and a part of the ball is embedded in the groove.

[0011] Each L-shaped groove includes an axial track and a circumferential track connected to each other. The circumferential track adopts an Archimedean spiral design. Part of the ball is embedded in the end of the limit rod, and the other part is located in the L-shaped groove and moves axially and rotates circumferentially according to a predetermined trajectory.

[0012] The beneficial effects of the present invention are:

[0013] The wedge-shaped throttle valve seat of the present invention cooperates with the valve core to form a throttling hole. During the axial movement of the valve core, the flow area of ​​the valve seat changes to achieve throttling. The L-shaped groove and the ball form a kinematic pair to guide the axial or circumferential movement of the fixed seat as the valve seat body; the special-shaped support cooperates with the valve core to strengthen the support and reduce the backflow impact; the guide belt cooperates with the sealing groove to straighten, seal, increase friction, prevent the fixed seat from accidentally rotating circumferentially, and indicate that the axial position is in place. The overall structure is simple and convenient for processing and assembly.

[0014] The wedge-shaped throttle valve seat of the present invention is constructed by inserting the compression spring, limit rod, and ball into the matching hole of the valve body. A conventional rod or pipe fitting tool is then used to insert the fixed seat mounting hole. The fixed seat body enters the valve body from the outlet end of the throttle valve. The ball enters the L-shaped groove distributed circumferentially on the outer surface of the fixed seat and rolls. The ball moves axially until the guide band just enters the valve body. The fixed seat is rotated to the end position of the L-shaped groove to complete the valve seat installation. At this time, the valve seat and the valve core reach the maximum support area, and the friction between the guide band and the valve body is at its maximum. When the valve seat needs to be removed, a pipe wrench or conventional rod tool is used to reverse the rotation to a certain angle and then pull out the valve seat as a whole. This is mainly used to solve the problems of existing split valve seats that are difficult to assemble and disassemble, have high processing requirements, and suffer from valve core vibration failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the assembly structure of the wedge-shaped throttle valve seat of the present invention;

[0016] Figure 2 It is a structural schematic diagram of the fixed seat in the wedge-shaped throttle valve seat of the present invention;

[0017] Figure 3It is a schematic diagram of the assembly structure of the limiting rod and the compression spring in the wedge-shaped throttle valve seat of the present invention.

[0018] In the figure, 100. Fixed seat, 101. Center hole, 102. Special-shaped support, 103. L-shaped groove; 104. Reducer shoulder, 105. Sealing groove, 106. Flat square, 107. Mounting through hole;

[0019] 200. Ball, 300. Limiting rod, 301. Groove; 302. Connecting rod, 303. Boss;

[0020] 400. Compression spring, 401. Moving end, 402. Stationary end;

[0021] 500. Guide strip, 600. Valve core, 700. Valve body, 800. Valve body matching hole. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1

[0024] The wedge-shaped throttle valve seat of the present invention is as follows Figure 1 and Figure 2 As shown, it includes a fixed seat 100, a ball 200, a limiting rod 300, a compression spring 400, and a guide belt 500. The valve seat cooperates with the wedge-shaped throttle valve body 700 and the valve core 600 to achieve throttling. Among them, the fixed seat 100 serves as the main body of the valve seat. The center position of the fixed seat 100 is axially opened with a center hole 101. The center hole 101 cooperates with the valve core 600 to form a throttling hole. At the same time, the protruding special-shaped support 102 on the upper end of the fixed seat 100 strengthens the support of the valve core 600 to resist the impact of the high-speed and high-pressure fluid entering the inlet, and at the same time reduces the backflow impact; the L-shaped groove 103 arranged circumferentially on the fixed seat 100 can make the ball 200 move in a limited manner according to the predetermined L-shaped trajectory, i.e. a→b→c, c→b→a. The variable diameter shoulder 104 positions the fixed seat to be installed in the axial position to the position b of the L-shaped groove 103. Figure 2 In the figure, a is the entrance position of the ball into the L-shaped groove, b is the axial position of the ball, and c is the maximum and deepest position of the ball into the L-shaped groove. Figure 3As shown, when the ball 200 is working, part of it is pressed into the L-shaped groove 103, and part of it is embedded in the groove 301 of the limiting rod. The connecting rod 302 of the limiting rod 300 is coaxially connected to the movable end 401 of the compression spring with the ball 200 and the boss 303. The stationary end 402 of the compression spring 400 is against the bottom of the valve body matching hole 800. Under the pressure of the limiting rod 300 and the compression spring 400, the ball 200 is always in the L-shaped groove and rolls. The guide belt 500 clamps the sealing groove 105 of the fixed seat 100 and then enters the outflow hole of the valve seat to play a straightening and sealing role. The rotation and insertion and removal of the fixed seat 100 are achieved by clamping the flat square 106 with an external conventional pipe clamp, or by inserting a rod-shaped tool into the installation through hole 107 to apply load.

[0025] like Figure 2 As shown, the fixed seat 100 is an integral cylinder with two types of outer diameter steps: the center hole 101 cooperates with the valve core 600 to form a throttling hole, and the flow area of ​​the valve core 600 changes with the valve seat during axial movement to achieve throttling; the reducing steps of the small outer diameter section and the large outer diameter section of the cylinder are reduced diameter shoulders 104, and the reduced diameter shoulders 104 position the fixed seat 100 in the axial position; an L-shaped groove 103 is arranged on the outer surface to form a kinematic pair with the ball 200 to guide the axial or circumferential movement of the fixed seat 100; one end of the small outer diameter section of the cylinder close to the valve core 600 is provided with a protruding special-shaped support 102 with a matching end portion, which is used to cooperate with the valve core 600 to strengthen support and reduce backflow impact; the outer surface of the large outer diameter section of the cylinder away from the valve core 600 is processed with a sealing groove 105, which can play the role of straightening, sealing, increasing friction, preventing the fixed seat 100 from accidentally rotating circumferentially, and indicating that the axial insertion is in place after being installed in the guide belt 500;

[0026] The L-shaped grooves 103 on the outer surface of the fixed seat 100 are symmetrically distributed around the axial circle, with a rotation angle of 90°, and there are two of them. Each L-shaped groove 103 is divided into an axial track and a circumferential track: the axial track ensures that the fixed seat 100 can move axially, that is, there is a chamfered entrance a to the corner point b for the ball 200 to enter; the circumferential track adopts an Archimedean spiral design, that is, from the corner point b to the end point c. When the ball 200 reaches point b, the reducing shoulder 104 of the fixed seat 100 and the valve body limiter cannot be inserted further, and the guide belt 500 just sinks into the valve body; when the ball of the rotating fixed seat 100 reaches the end point c, the ball 200 is embedded in the deepest position, the limit rod 300 partially enters the L-shaped groove 103, and the fixed seat 100 supports the largest area of ​​the valve core. The special-shaped support 102 of the fixing seat 100 close to the valve core 600 has a raised end surface of a trigonometric function surface covering 180° of the circumference, which strengthens the support while reducing the local concentrated erosion stress of the fluid.

[0027] like Figure 1 and Figure 3As shown, the limiting rod 300 includes a connecting rod 302, with a boss 303 at one end and a groove 301 at the other. A portion of the ball 200 is embedded in the groove 301 at one end of the connecting rod 302, while the other portion rolls in the L-shaped groove 103 of the fixed seat. The boss 303 is engaged with the movable end 401 of the compression spring 400 to provide a positive position and enhance the stability of the compression action. The stationary end 402 of the compression spring 400 presses against the inner bottom of the valve body mating hole 800.

[0028] In order to cooperate with the movement of the L-shaped groove 103 and the ball 200, the cylindrical outer circle of the fixed seat 100 extending out of the valve body 700 is symmetrically arranged with a flat square 106. The flat square 106 is also designed with a mounting hole 107 for rotation or pulling by conventional pipe wrenches or rod tools.

[0029] The wedge-shaped throttle valve seat of the present invention has the following working process:

[0030] Example 2: Installing the valve seat

[0031] Connect the two pairs of compression springs 400, the limiting rod 300, and the ball 200 in sequence and install them into the valve seat mating hole 800. Install the guide strip 500 into the sealing groove 105 on the fixed seat 100. Use a common rod tool to insert the fixing seat 100 through the mounting hole 107. Adjust the angle so that the axial track of the L-shaped groove 103 aligns with the ball 200. Apply a load and insert the fixing seat 100 and the guide strip 500 together into the outlet of the throttle valve body. When the reducing shoulder 104 contacts the valve body and cannot be pressed further, the ball 200 rolls to position b of the L-shaped groove 103, and the guide strip 500 just submerges the valve body outlet. Rotate the fixed seat 100 clockwise, and the ball 200 moves to position c of the L-shaped groove 103. At this point, the special-shaped support 102 and the valve core form the maximum support area. If the rotation is too tight and difficult to achieve with a rod tool, use a pipe wrench to clamp the flat square 106 and rotate it into place.

[0032] Example 3: Disassembling the valve seat

[0033] Use a pipe wrench to hold the flat square 106 and rotate the fixing base 100 counterclockwise a certain angle to move the ball 200 from position c to position b. Use a common rod tool to remove the fixing base 100 and guide band 500 through the mounting hole 107 of the fixing base 100. Press and check the elasticity of the ball 200, limit rod 300, and compression spring 400. If the elasticity is normal, there is no need to disassemble the fixing base 100; simply install it according to the instructions in Example 2. If the elasticity fails or parts are damaged, replace them and reinstall according to Example 2. Also, after each removal of the fixing base 100, clean the parts, inspect the sealing groove 105, and replace the guide band 500.

[0034] The wedge-shaped throttle valve seat of the present invention has the advantages that the center hole and the valve core cooperate to form a throttling hole, and throttling is achieved by changing the flow area of ​​the valve seat during the axial movement of the valve core; the L-shaped groove and the ball form a moving pair to guide the axial or circumferential movement of the fixed seat as the valve seat body; the special-shaped support cooperates with the valve core to strengthen the support and reduce the backflow impact; the guide belt cooperates with the sealing groove to straighten, seal, and increase the friction to prevent the fixed seat from accidentally rotating circumferentially and showing that the axial position is in place. The overall structure is simple and convenient for processing and assembly; it is mainly used to solve the problems of difficult assembly and disassembly of existing split valve seats, high processing requirements, and valve core vibration failure.

Claims

1. Wedge-shaped throttle valve seat, characterized in that: The invention comprises a fixing seat (100) and two limiting rods (300) symmetrically arranged in two valve body matching holes (800) of a wedge-shaped throttle valve, wherein a center hole (101) is axially opened at the center position of the fixing seat (100), and L-shaped grooves (103) are opened on the outer surfaces of the two opposite sides of the fixing seat (100), and the two L-shaped grooves (103) have the same direction, and one end of the two limiting rods (300) is inlaid with a ball (200), and the other end is connected to a compression spring (400), and one end of the compression spring (400) is fixedly connected to the bottom of the inner hole of the valve body matching hole (800), and the ball (200) and the L-shaped groove (103) form a kinematic pair, and the top of the fixing seat (100) is provided with a special-shaped support (102) for supporting the valve core (600) of the wedge-shaped throttle valve.

2. The wedge-shaped throttle valve seat according to claim 1, characterized in that: The fixing seat (100) is an integral cylindrical structure processed with different outer diameter steps, and the diameter-changing steps of the small outer diameter section and the large outer diameter section of the cylinder are diameter-changing shoulders (104), and the diameter-changing shoulders (104) are used to locate the fixing seat (100) in the axial position; the special-shaped support (102) is protruded and arranged at the end of the small outer diameter section of the cylinder, and a sealing groove (105) is opened along the circumferential direction on the outer surface of the large outer diameter section of the cylinder, and a guide belt (500) is arranged in the sealing groove (105); when the ball (200) moves to the corner point of the L-shaped groove (103), the diameter-changing shoulder (104) and the valve body (700) of the wedge-shaped throttle valve are limited and cannot be further inserted, and at the same time, the guide belt (500) is just immersed in the valve body (700).

3. The wedge-shaped throttle valve seat according to claim 2, characterized in that: The special-shaped support (102) is a special-shaped protrusion structure that matches the end of the cylindrical small outer diameter section of the fixing seat (100), and the protrusion end surface is a trigonometric function surface covering 180° of the circumference.

4. The wedge-shaped throttle valve seat according to claim 2, characterized in that: Flat squares (106) are symmetrically arranged on the outer circumference of the portion of the cylindrical section with a large outer diameter extending out of the valve body (700).

5. The wedge-shaped throttle valve seat according to claim 4, characterized in that: The flat square (106) is also provided with a mounting through hole (107).

6. The wedge-shaped throttle valve seat according to claim 1, characterized in that: The limiting rod (300) is provided with a groove (301) at one end and a boss (303) at the other end. The movable end (401) of the compression spring (400) is sleeved on the outer periphery of the boss (303). The stationary end (402) of the compression spring (400) abuts against the inner bottom of the valve body matching hole (800), and a portion of the ball (200) is embedded in the groove (301).

7. The wedge-shaped throttle valve seat according to claim 1, characterized in that: Each L-shaped groove (103) includes an axial track and a circumferential track that are connected. The circumferential track adopts an Archimedean spiral design. A portion of the ball (200) is embedded in the end of the limiting rod (300), and the other portion is located in the L-shaped groove (103) and moves axially and rotates circumferentially according to a predetermined trajectory.

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