Right-angle check valve

Abstract

The utility model relates to the technical field of valves, in particular to a right-angle check valve. The right-angle check valve comprises a valve body, a valve ball and a valve seat, the valve ball and the valve seat are arranged in the valve body, the valve body is provided with a horizontal inlet and a vertical outlet, the valve seat is installed at the position of the inlet, an inclined valve ball roller path is installed in the valve body, the lower end of the valve ball roller path extends to the position of the valve seat, and the upper end of the valve ball roller path extends in the direction away from the valve seat. When the oil pumping unit moves upwards, oil-water mixed liquid produced by an oil producing well enters an inlet of the check valve, the valve ball is pushed under the action of pressure and flow, the valve ball rolls upwards along the valve ball raceway, and the oil-water mixed liquid flows out through an outlet of the check valve; and the check valve is closed to achieve a check effect, so that the problem of failure of the check valve is effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a right-angle check valve. Background Art

[0002] The oil pump is an important mechanical oil production equipment for oil extraction. Its main operating mode is that the sucker rod makes a fixed period of up and down reciprocating motion, and the oil-water mixture in the wellbore is pumped out into the ground gathering and transportation network through the oil pump. In order to prevent the oil-water mixture in the gathering and transportation pipeline system from flowing back, avoid polluting the environment and wasting resources, oilfield enterprises will use check valves in the oil, gas and water gathering and transportation pipeline systems during production. In the normal production of oil wells, a check valve must be installed on the wellhead pipeline to prevent the oil-water mixture from flowing back. At present, the check valves commonly used in oil wells are vertically installed on the wellhead pipeline by welding, and the oil-water mixture flows from bottom to top through the valve ball and valve seat in the check valve. However, the following problems exist during long-term use: First, since the oil pump makes up and down reciprocating motions between 3000 and 5000 times a day, the valve ball and the valve seat will cause damage and wear on the sealing surface due to long-term impact, resulting in a short service life of the check valve; second, since the produced oil-water mixture is corrosive and contains impurities such as sand and wax, the impurities are deposited on the valve ball and the valve seat, resulting in a loose seal on the sealing surface, making the check valve unable to play a check function, and the oil-water mixture in the gathering and transportation system is prone to backflow; third, since the check valves are welded to the wellhead pipeline, they can only be cut off and replaced with gas welding, and daily inspection and cleaning work cannot be carried out, resulting in a large workload for inspection and maintenance, a long shutdown time of the oil well, affecting production and being time-consuming and labor-intensive.

[0003] In order to solve the above problems, a Chinese utility model patent with authorization announcement number CN203939694U and authorization announcement date November 12, 2014 discloses an angle check valve for a water injection pump, the angle check valve for a water injection pump includes a valve body, a valve seat, a valve ball, a bushing, a spring, and a plug. The valve body is a three-way structure, and its central through hole is stepped, a plug is installed at one end, the valve seat sits on the inner shoulder of the central through hole of the valve body, the bushing is installed between the valve seat and the plug, a flow hole is opened on the outer tube wall of the bushing, a valve ball and a spring are installed in the bushing in sequence, and a conical seal is adopted. The inlet and outlet of the valve body are connected to the outlet of the water injection pump and the water injection network respectively. When the outlet pressure of the water injection pump is greater than the pressure of the water injection network, the valve ball compresses the spring to move, and the water flows into the water injection network through the flow hole on the bushing. When the pump is stopped, the valve ball is sealed with the valve seat under the combined action of the spring and the return water pressure of the water injection network to prevent water backflow. When debris enters the upper end surface of the valve seat and causes the valve ball to fail to close normally, the screw plug can be opened to clear the debris from the inner cavity of the valve body.

[0004] The above utility model provides an angle check valve for an injection pump, which adopts a conical seal. Although it solves the problem of poor sealing of the check valve, and at the same time, the thread plug can be opened, the dirt in the valve body can be cleared or damaged parts can be replaced to restore the normal operation of the check valve, thereby reducing the operating cost and labor intensity. However, in order to ensure the centripetal movement of the valve ball, the clearance between the bushing and the valve ball is designed to be small. The valve ball and the bushing will wear quickly due to long-term operation, and the valve ball and the valve seat will also be easily worn due to long-term collision. In addition, the valve ball is sealed under the action of a spring. The spring is squeezed at a high working frequency and is prone to fatigue fracture. The valve ball is easily stuck in the bushing by the broken wire of the spring, causing the check valve to lose its check function. Utility Model Content

[0005] The utility model aims to provide a right-angle check valve to solve the problem that the check valve is easy to fail.

[0006] In order to achieve the above purpose, the right-angle check valve of the utility model adopts the following technical solutions:

[0007] A right-angle check valve comprises a valve body, a valve ball and a valve seat arranged in the valve body, wherein the valve body has a horizontal inlet and a vertical outlet, the valve seat is installed at the inlet, an inclined valve ball raceway is installed in the valve body, the lower end of the valve ball raceway extends to the valve seat, and the upper end extends away from the valve seat.

[0008] Beneficial effects: The right-angle check valve of the utility model is a pioneering invention. Specifically, the check valve includes a valve body, a valve ball and a valve seat. The valve body has a horizontal inlet and a vertical outlet. By installing the valve seat at the inlet of the valve body and installing an inclined valve ball track in the valve body, the lower end of the valve ball track extends to the valve seat, and the upper end extends away from the valve seat. When the pump moves upward, the oil-water mixture produced by the oil well enters the inlet of the check valve, and the valve ball is pushed by the pressure and flow. The valve ball rolls upward along the valve ball track, and the oil-water mixture flows out through the outlet of the check valve. When the pump moves downward, the valve ball rolls down to the valve seat along the valve ball track by its own weight, closing the check valve to achieve a check effect, thereby effectively avoiding the problem of check valve failure.

[0009] Furthermore, a ball-blocking structure is provided on the valve ball raceway, and when the valve ball is stopped by the ball-blocking structure, the center thereof deviates toward the side close to the valve seat to the center of the inlet of the valve body.

[0010] Furthermore, the valve ball raceway includes two position limiting guide rails arranged in parallel and at intervals, the distance between the two position limiting guide rails is smaller than the diameter of the valve ball, and the inner sides of the top ends of the adjacent sides of the position limiting guide rails constitute the valve ball raceway.

[0011] Furthermore, a protruding portion is provided at one end of the position limiting guide rail away from the valve seat, the distance between the protruding portion and the inner wall of the valve body is smaller than the diameter of the valve ball, and the ball retaining structure is formed by the protruding portion.

[0012] Furthermore, one end of the position limiting guide rail away from the valve seat is fixed on a connecting disk, and the connecting disk is fixedly connected to the valve body.

[0013] Furthermore, an inspection port is provided on the valve body at one end away from the valve seat, and the combination of the connecting plate and the limiting guide rail is installed into the valve body through the inspection port and is detachably connected to the valve body.

[0014] Furthermore, an installation step cooperating with the connecting disk is provided on the inner wall of the valve body, and the connecting disk is fixed on the installation step.

[0015] Furthermore, the valve ball rolling path is an inclined ramp with an angle of 10°-25°.

[0016] Furthermore, a pressure ring is fixedly mounted on the lower end of the valve ball raceway, and the valve seat is press-fitted and fixed in the valve body by the pressure ring.

[0017] Furthermore, a ball blocking body is arranged at the outlet of the valve body to prevent the valve ball from falling from the outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a specific embodiment of the right-angle check valve of the utility model;

[0019] Figure 2 for Figure 1 Schematic diagram of the structure of the middle raceway assembly;

[0020] Figure 3 for Figure 2 Left view of

[0021] Figure 4 for Figure 2 A top view of

[0022] Figure 5 for Figure 2 An A-directed graph.

[0023] In the figure: 1. valve body; 2. valve ball; 3. valve seat; 4. thread plug; 5. pressure ring; 6. valve ball raceway; 601. limit guide rail; 7. ball retaining structure; 8. inlet; 801. inner shoulder; 9. sealing ring; 10. inspection port; 12. outlet; 13. ball retaining body; 14. drainage groove; 15. connecting plate; 16. connecting hole; 17. installation step; 18. fastener; 61. raceway assembly. DETAILED DESCRIPTION

[0024] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0025] An angle check valve for a water injection pump disclosed in the prior art adopts a conical seal, which solves the problem of poor sealing of the check valve. At the same time, the thread plug can be opened to clear the dirt in the valve body or replace damaged parts to restore the normal operation of the check valve, thereby reducing the operating cost and labor intensity. However, in order to ensure the centripetal movement of the valve ball, the clearance between the bushing and the valve ball is small. The valve ball and the bushing will wear quickly during long-term operation, and the valve ball and the valve seat will also be easily worn due to long-term collision. In addition, the valve ball is sealed under the action of a spring. The spring is squeezed at a high working frequency and is prone to fatigue fracture. The valve ball is easily stuck in the bushing by the broken wire of the spring, causing the check valve to lose its check function. In view of the above problems, the utility model designs a right-angle check valve. The core concept of this solution is to install the valve seat at the inlet of the valve body, and install an inclined valve ball rolling way in the valve body. The lower end of the valve ball rolling way extends to the valve seat, and the upper end extends in the direction away from the valve seat. The valve ball can roll up and down on the inclined valve ball rolling way and cooperate with the valve seat to realize the switching of the check valve. The inclined valve ball rolling way can also reduce the impact force of the valve ball on the valve seat, thereby effectively avoiding the problem of failure of the check valve.

[0026] Based on the above invention concept, Figure 1 As shown, a right-angle check valve of the utility model comprises a valve body 1 and a valve ball 2 and a valve seat 3 arranged in the valve body 1. The valve body 1 has a horizontal inlet 8 and a vertical outlet 12. The valve seat 3 is installed at the inlet 8. An inclined valve ball raceway 6 is installed in the valve body 1. The lower end of the valve ball raceway 6 extends to the valve seat 3, and the upper end extends away from the valve seat 3.

[0027] Among the above components, Figure 1 In the embodiment shown, the valve body 1 is a three-way structure with equal diameters. One coaxial end of the valve body 1 is the inlet 8 of the check valve. The inlet 8 is a horizontal inlet and is horizontally connected to the wellhead pipeline by welding. The central through hole of the inlet 8 is stepped, which can be conveniently connected to the valve seat 3. The valve seat 3 is annular in shape and is installed on the inner shoulder 801 of the central through hole of the inlet 8 by threaded connection with the valve body 1, and is sealed with the inner shoulder 801 by a sealing ring 9. In some other embodiments, the inlet 8 can also be threadedly connected to the wellhead pipeline, and the shape of the valve seat 3 can also be conical. The other coaxial end of the valve body 1 is the inspection port 10 of the check valve, which is sealed by a plug 4. The plug 4 is threadedly connected to the inspection port 10 and can be easily disassembled. The components in the valve body 1 can be routinely inspected, cleaned and replaced through the inspection port 10. The non-coaxial end of the valve body 1 is the outlet 12 of the check valve. The outlet 12 is a vertical outlet and is vertically connected to the wellhead pipeline by a threaded connection. A ball blocking body 13 is provided at the inner outlet of the valve body 1. The ball blocking body 13 is a straight-line baffle to prevent the valve ball 2 from falling from the outlet 12. In some other embodiments, the outlet 12 can also be welded to the wellhead pipeline, and the shape of the ball blocking body 13 can also be a cross-shaped baffle.

[0028] In such Figure 1 In the embodiment shown, an inclined valve ball raceway 6 is installed in the valve body 1, the lower end of the valve ball raceway 6 extends to the valve seat 3, and the upper end extends away from the valve seat 3. The valve ball raceway 6 includes two parallel and spaced limiting guide rails 601, the distance between the two limiting guide rails 601 is less than the diameter of the valve ball 2, and the inner side of the top of the adjacent side of the limiting guide rail 601 constitutes the valve ball raceway 6. In some other embodiments, it can also be set as a limiting guide rail with a certain width. The valve ball raceway 6 is a 15°-25° inclined ramp, which can increase the centripetal force of the valve ball 2, increase the upward resistance and downward sliding of the valve ball 2, and at the same time reduce the impact force of the valve ball 2 on the valve seat 3, protecting the sealing surface of the valve ball 2 and the valve seat 3. A protruding portion is provided at the end of the limiting guide rail 601 away from the valve seat 3, and the distance between the protruding portion and the inner wall of the valve body 1 is smaller than the diameter of the valve ball 2. The protruding portion constitutes a ball blocking structure 7, and the ball blocking structure 7 can limit the upward distance of the valve ball 2. When the valve ball 1 is stopped by the ball blocking structure 7, its center deviates toward the side close to the valve seat 3 to the center of the inlet 8 of the valve body 1. The ball blocking structure 7 and the valve ball raceway 6 form a right-angled trapezoidal structure, which has good stability and guidance, and can effectively prevent the valve ball 2 from deviating from the valve ball raceway 6 due to shaking or external force interference during rolling. This structure can also save space and is easy to manufacture and install. In some other embodiments, it can also be set to an inclined trapezoidal structure. Considering that the flow through the check valve will fluctuate greatly due to the fluctuation of the production volume of the oil well and the daily line sweeping, well washing and other work reasons, in order to prevent the limit guide rail 601 from jumping, the end of the limit guide rail 601 away from the valve seat 3 is fixed on a connecting plate 15. In order to match the limit guide rail 601 and save space, the diameter of the connecting plate 15 is set to be equal to the height of the limit guide rail 601, so that the connecting plate 15 can be easily taken out for maintenance, replacement or cleaning. In some other embodiments, the diameter of the connecting plate 15 can also be greater than the height of the valve ball raceway 6. The shape of the connecting plate 15 is circular, and in some other embodiments, it can also be set to be square, elliptical, rectangular, etc.

[0029] In such Figure 3 and Figure 5 In the illustrated embodiment, a connecting hole 16 is provided in the middle and lower part of the connecting plate 15 for fixing the connecting plate 15 and the valve ball raceway 6 .

[0030] In such Figure 1In the embodiment shown, the assembly consisting of the connecting plate 15 and the limiting guide rail 601 is installed into the valve body 1 from the inspection port 10 and is detachably connected to the valve body 1. The inner wall of the valve body 1 is provided with a mounting step 17 that matches the connecting plate 15. The connecting plate 6 is fixed on the mounting step 17. The mounting step 17 is in an L-shaped shape, which is convenient for fixing the valve ball raceway 6 and has good stability. The connecting plate 15 and the mounting step 17 are connected and fixed through the connecting hole 16 by a fastener 18. The fastener 18 is preferably a fixing bolt, which can prevent the assembly consisting of the connecting plate 15 and the limiting guide rail 601 from moving forward and backward. In some other embodiments, the shape of the mounting step 17 can also be set to be a straight line or square, and the fastener 18 can also be a fixing screw, a pin, etc. The lower end of the valve ball raceway 6 is fixedly installed with a pressure ring 5. The valve seat 3 is fixed in the valve body 1 by the pressure ring 5. The pressure ring 5 can limit the movement of the valve seat 3 and guide the valve ball 2 to push toward the valve seat 3, thereby improving the sealing performance between the valve ball 2 and the valve seat 3. Taking into account the convenience of cleaning, maintenance and replacement of the pressure ring 5 and the matching with the valve ball raceway, the outer diameter of the pressure ring 5 is set to be smaller than the inner diameter of the valve body 1. In order to allow the valve ball 2 to be smoothly pushed toward the valve seat 3, the inner diameter of the pressure ring 5 is set to be larger than the inner diameter of the valve seat 2. In order to adapt to the valve ball 2 and the valve seat 3, the shape of the pressure ring 5 is set to be a round cap shape. In some other embodiments, the shape of the pressure ring 5 may also be square or elliptical.

[0031] In such Figure 4 and Figure 5 In the illustrated embodiment, a drainage groove 14 is provided at the lower portion of the pressure ring 5, and the groove is rectangular in shape. The drainage groove 14 can increase the adhesion pressure on the surface of the valve ball 2, push the valve ball 2 toward the center of the valve seat 3, improve the sealing performance between the valve ball 2 and the valve seat 3, and can also drain the oil-water mixture to the outlet 12 of the check valve.

[0032] In such Figure 1 and Figure 2 In the embodiment shown, the pressure ring 5, the valve ball raceway 6, the ball retaining structure 7, and the connecting plate 15 constitute the raceway assembly 61. The raceway assembly 61, the valve ball 2, and the valve seat 3 all adopt a detachable connection structure, which can be timely repaired, replaced, and cleaned, thereby reducing the sealing of the sealing surface of the valve ball 2 and the valve seat 3 due to impurity deposition and corrosion, and reducing the repair difficulty, maintenance workload, and cleaning time of the check valve. Considering that the oil-water mixture is corrosive, the raceway assembly 61 is made of stainless steel material, which can play an anti-corrosion role and achieve the purpose of extending the service life. In some other embodiments, other materials with good corrosion resistance such as carbon steel can also be used.

[0033] When using a right-angle check valve, the inlet 8 of the check valve is horizontally installed on the wellhead pipeline of the oil well, and the outlet 12 of the check valve is vertically installed downward on the wellhead pipeline of the oil well. The check valve can be used in conjunction with a pressure gauge installed on the wellhead pipeline. When the oil well is in normal production, when the pumping unit moves upward, the oil-water mixture produced by the oil well enters the inlet 8 of the check valve horizontally. The pressure in the well is greater than the back pressure, and the oil-water mixture pushes the valve ball 2 to roll upward along the valve ball rolling path 6, and rolls to the ball retaining structure 7 on the upper part of the valve ball rolling path 6. The oil-water mixture flows out of the check valve through the outlet 12 of the check valve. At this time, the pressure The force gauge displays normal pressure; when the pump moves downward and no oil-water mixture is produced in the wellbore of the oil production well, the pressure in the well drops to less than the back pressure, and the valve ball 2 of the check valve rolls downward and centripetally along the valve ball rolling path 6 to the valve seat 3 by its own weight, closing the check valve to achieve a check effect. At this time, the pressure gauge display also drops back to zero. The swing of the pressure gauge pointer allows the inspection personnel to intuitively observe the production status of the oil production well, and also make an intuitive judgment on the check performance of the check valve, allowing the inspection personnel to conduct inspections in a safe environment, thereby improving the speed of judging the production status of the oil production well.

[0034] When inspecting and cleaning the valve ball raceway assembly 61, valve ball 2 and valve seat 3 of the check valve, first close the control valves on both sides of the inlet and outlet 8 of the check valve, release the pressure and vent, remove the plug 4, remove the fastener 18 from the inspection port 10 of the check valve, take out the raceway assembly 61, valve ball 2, valve seat 3, sealing ring 9 in turn, inspect the appearance and sealing condition of the raceway assembly 61, valve ball 2, valve seat 3 and sealing ring 9, clean the impurities precipitated on the raceway assembly 61, valve ball 2 and valve seat 3, after the inspection and cleaning are completed, install the valve seat 3, sealing ring 9, valve ball 2 and raceway assembly 61 in turn, then install the fastener 18, then install the plug 4, close the vent, open the control valves on both sides of the inlet and outlet of the check valve, and resume the production of the oil well.

Claims

1. A right-angle check valve, characterized in that: It includes a valve body, a valve ball and a valve seat arranged in the valve body, the valve body has a horizontal inlet and a vertical outlet, the valve seat is installed at the inlet, an inclined valve ball raceway is installed in the valve body, the lower end of the valve ball raceway extends to the valve seat, and the upper end extends away from the valve seat.

2. The right-angle check valve according to claim 1, characterized in that: A ball-blocking structure is provided on the valve ball rolling track. When the valve ball is blocked by the ball-blocking structure, its center deviates toward the side close to the valve seat to the center of the inlet of the valve body.

3. The right-angle check valve according to claim 2, characterized in that: The valve ball rolling path comprises two position limiting guide rails which are arranged in parallel and at intervals, the distance between the two position limiting guide rails is smaller than the diameter of the valve ball, and the inner sides of the top ends of the adjacent sides of the position limiting guide rails constitute the valve ball rolling path.

4. The right-angle check valve according to claim 3, characterized in that: A protruding portion is provided at one end of the position-limiting guide rail away from the valve seat, the distance between the protruding portion and the inner wall of the valve body is smaller than the diameter of the valve ball, and the ball-blocking structure is formed by the protruding portion.

5. The right-angle check valve according to claim 4, characterized in that: One end of the position-limiting guide rail away from the valve seat is fixed on a connecting disk, and the connecting disk is fixedly connected to the valve body.

6. The right-angle check valve according to claim 5, characterized in that: An inspection port is provided on the valve body at one end away from the valve seat, and the assembly consisting of the connecting plate and the limiting guide rail is installed into the valve body through the inspection port and is detachably connected to the valve body.

7. The right-angle check valve according to claim 6, characterized in that: An installation step matching with the connecting disk is arranged on the inner wall of the valve body, and the connecting disk is fixed on the installation step.

8. The right-angle check valve according to claim 1 or 2, characterized in that: The valve ball rolling path is an inclined ramp with an angle of 10°-25°.

9. The right-angle check valve according to claim 1 or 2, characterized in that: A pressure ring is fixedly mounted on the lower end of the valve ball raceway, and the valve seat is press-fitted and fixed in the valve body through the pressure ring.

10. The right-angle check valve according to claim 1 or 2, characterized in that: A ball blocking body is arranged at the outlet of the valve body to prevent the valve ball from falling from the outlet.

Images