Piston-type check valve

Abstract

The utility model discloses a piston type check valve, including the shell body, the shell body is arranged the baffle, the baffle divides the shell body into the upper chamber, the lower chamber, the shell body sets up the first oil hole at the upper chamber, the shell body sets up the second oil hole at the lower chamber, the baffle sets up the sealing seat, the piston type sealing piece is sealed, slidingly arranged in the sealing seat, the piston type sealing piece sets up the intercommunication channel, the piston type sealing piece is always in the sealing seat, when the piston type sealing piece moves up, the intercommunication channel intercommunicates the upper chamber, the lower chamber, the shell body sets up the pressure -exerting mechanism, and the pressure -exerting mechanism can make the piston type sealing piece and the sealing seat seal. The utility model discloses the piston type sealing piece is always in the sealing seat, and the positioning wear will not happen, has improved the service life of check valve, has reduced the labor intensity of people greatly.

Description

Technical Field

[0001] This utility model relates to the field of pipeline transportation technology, specifically to a piston-type single-flow valve. Background Technology

[0002] Currently, many oilfields have heavy oil wells and wax-laden wells. To prevent oil backflow, check valves are installed. However, during production, the check valves may not close tightly due to wax crystallization or impurities, causing great inconvenience to production operations, increasing labor intensity, and affecting the normal production of oil wells.

[0003] Announcement No. CN221897179U discloses a check valve with protective performance, including a valve body, an outlet pipe embedded on the left side near the bottom of the valve body, an inlet pipe embedded on the right side near the top of the valve body, a limiting ring on the top of the valve body, a top cover above the annular groove, a retaining element in the middle of the inner wall of the valve body, a through groove in the middle of the bottom of the retaining element, and a blocking structure in the through groove, the blocking structure including a blocking element and a connecting rod.

[0004] The existing conical sealing structure is easy to position, but can only achieve a first-level seal. The use of the flat surface of its convex ring portion for sealing can lead to over-positioning.

[0005] Announcement No. CN217927316U discloses a double-sealed anti-leakage check valve, including a valve body, valve cover, flow channel, valve stem, and valve core. The valve body has an installation groove, and a valve seat is provided in the installation groove. The valve seat consists of a lower fixing block, an intermediate connecting section, and an upper sealing block. The lower fixing block is fixed in the installation groove by screwing in a first bolt. The intermediate connecting section is fixed on the upper end face of the lower fixing block. The upper sealing block is located on the upper end face of the intermediate connecting section and is screwed in with a second bolt. The upper end of the lower fixing block has a longitudinal upper groove, and a push block and a compression spring are provided in the upper groove.

[0006] The existing technology does not have a positioning problem, but it can only achieve a first-level seal.

[0007] Announcement No.: CN209688181U discloses a flange lifting check valve, including a valve body with an inlet channel and an outlet channel. A screw is uniformly welded to the top of the valve body near the edge. A sealing ring gasket and a circular elastic sealing ring are also included, which can provide double sealing.

[0008] The existing technology achieves double sealing, but axial positioning wear occurs with each opening and closing, accelerating the failure rate of the cylindrical sealing surface. Furthermore, the sealing seat of the existing technology cannot be replaced, which will render the entire valve body unusable.

[0009] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of this utility model. For more technical features, technical problems to be solved, and beneficial effects of this utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0010] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, the present invention provides a piston-type single-flow valve.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] A piston-type check valve includes a housing body. A partition is disposed within the housing body, dividing it into an upper chamber and a lower chamber. A first oil hole is provided in the upper chamber, and a second oil hole is provided in the lower chamber. A sealing seat is provided on the partition, and a piston-type seal is slidably disposed within the sealing seat. The piston-type seal has a connecting channel, and it remains within the sealing seat. When the piston-type seal moves upward, the connecting channel connects the upper and lower chambers. A pressure-applying mechanism is provided on the housing body, enabling the piston-type seal to seal with the sealing seat.

[0013] Furthermore, the connecting channel is an oil outlet hole, and the piston-type seal is provided with an oil outlet hole in a radial direction. The diameter of the oil outlet hole is larger than the thickness of the partition plate. When the oil outlet hole extends upward out of the partition plate, the oil outlet hole connects the upper cavity and the lower cavity.

[0014] Furthermore, the sealing seat has a through-hole at its center, and the sealing seat and the piston-type seal achieve a two-stage seal through a cylindrical sealing surface and a positioning sealing surface;

[0015] Specifically, the inner wall of the sealing seat is a first cylindrical sealing surface, and the upper end of the inner wall of the sealing seat is provided with an outwardly expanding first positioning sealing surface;

[0016] Specifically, the outer wall of the piston seal is a second cylindrical sealing surface, and the upper end of the outer wall of the piston seal is provided with an outwardly expanding second positioning sealing surface;

[0017] Specifically, the pressure-applying mechanism can seal the first cylindrical sealing surface with the second cylindrical sealing surface, or position and seal the first positioning sealing surface with the second positioning sealing surface.

[0018] Furthermore, the first positioning sealing surface and the second positioning sealing surface are arc-shaped surfaces.

[0019] Furthermore, the sealing seat includes a connecting ring and a seat ring, with the seat ring disposed at the upper end of the connecting ring;

[0020] Specifically, the inner wall of the connecting ring is provided with a first cylindrical sealing surface, and the inner wall of the seat ring is an upward-facing first positioning sealing surface;

[0021] Specifically, the partition plate is provided with a through threaded hole, and the outer wall of the connecting ring is connected to the threaded hole.

[0022] Furthermore, the piston-type seal includes a column and a positioning ring, with the positioning ring disposed at the upper end of the column;

[0023] Specifically, the outer wall of the column is a second cylindrical sealing surface, the column is radially provided with an oil outlet hole, and the outer wall of the positioning ring is a downward-facing second positioning sealing surface.

[0024] Furthermore, the pressure-applying mechanism includes a self-pressurizing part and an active pressure-applying part;

[0025] Specifically, the self-pressurizing part includes a spring, the upper end of the positioning ring of the piston seal is provided with a spring limiting ring, the lower end of the spring contacts the pressure-applying end face of the piston seal within the spring limiting ring, and the upper end of the spring contacts the upper end face of the upper cavity.

[0026] Specifically, the active pressure application part includes a lead screw, which is connected to the upper plate of the upper cavity through a sealing thread. By driving the lead screw, the lower end of the lead screw contacts the pressure application end face, thereby controlling the position of the piston-type seal.

[0027] Furthermore, the outer shell body has a cleaning hole in the upper cavity and a vent hole in the lower cavity.

[0028] Furthermore, the first oil hole is connected to the oil outlet pipeline, and the second oil hole is connected to the oil inlet pipeline;

[0029] Specifically, the cleaning hole is connected to the cleaning gate, and the venting hole is connected to the venting gate.

[0030] Furthermore, the cleaning hole is positioned opposite to the first oil hole, the vent hole is positioned opposite to the second oil hole, and the first oil hole is positioned opposite to the second oil hole.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] The piston-type seal of this invention is always inside the sealing seat and will not experience positioning wear. This invention uses a dual sealing method and can also be forcibly closed mechanically. This not only ensures the function of the check valve and improves work efficiency, but also allows for the replacement of various seals, extending the service life of the check valve and greatly reducing the labor intensity of workers. Attached Figure Description

[0033] Figure 1This is an exploded structural diagram of the piston-type single-flow valve of this utility model.

[0034] Figure 2 This is a schematic diagram of the structure of the piston-type single-flow valve of this utility model.

[0035] Figure 3 This is a structural schematic diagram of the sealing seat and piston-type sealing element in this utility model.

[0036] Figure 4 This is a schematic diagram of the outer shell body in this utility model.

[0037] Figure 5 This is a schematic diagram of the piston-type seal in this utility model.

[0038] Figure 6 This is a schematic diagram of the structure of the upper cover in this utility model.

[0039] In the diagram: 1. Top cover; 2. Cleaning gate; 3. Venting gate; 4. Screw; 5. Oil outlet line; 6. Sealing seat; 7. Spring; 8. Handwheel; 9. Piston seal; 10. Oil inlet line; 11. Outer shell; 12. Second positioning sealing surface; 13. Oil outlet hole; 14. Second cylindrical sealing surface; 15. First positioning sealing surface; 16. First cylindrical sealing surface; 17. Partition plate; 18. Flange ring; 19. Fastening screw hole; 20. First oil hole; 21. Threaded hole; 22. Venting hole; 23. Cleaning hole; 24. Second oil hole; 25. Pressure application end face; 26. Upper cavity; 27. Lower cavity; 28. Mounting hole; 29. ​​Top cover flange. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] Piston-type check valves are various types of check valves used in heavy oil wells and wax-contaminated wells in the petroleum industry. They are prone to jamming and failure during production, which brings difficulties to production operations. This invention is a utility model designed to address this issue.

[0042] Example 1:

[0043] Please see Figures 1 to 6The piston-type flow valve provided by this utility model includes a housing body 11. A partition 17 is provided inside the housing body 11, dividing the housing body 11 into an upper chamber 26 and a lower chamber 27. A first oil hole 20 is provided in the upper chamber 26, and a second oil hole 24 is provided in the lower chamber 27. A sealing seat 6 is provided on the partition 17, and the sealing seat 6 centrally connects the upper chamber 26 and the lower chamber 27. A piston-type seal 9 is slidably disposed within the sealing seat 6. The inner wall of the sealing seat 6 is a first cylindrical sealing surface 16, and the upper end of the inner wall of the sealing seat 6 is provided with an outwardly expanding first positioning sealing surface 15. The outer wall of the piston-type seal 9 is a second cylindrical sealing surface 14, and the upper end of the outer wall of the piston-type seal 9 is provided with an outwardly expanding second positioning sealing surface 12. The outer shell body 11 is provided with a pressure applying mechanism in the upper cavity 26. The pressure applying mechanism can seal the first cylindrical sealing surface 16 with the second cylindrical sealing surface 14, or position and seal the first positioning sealing surface 15 with the second positioning sealing surface 12.

[0044] During the sealing process, the first cylindrical sealing surface 16 and the second cylindrical sealing surface 14 form a primary seal. The downward movement of the piston-type seal 9 can push the dirt on the surface of the first cylindrical sealing surface 16 downward, maintaining the sealing performance of the first cylindrical sealing surface 16 and the second cylindrical sealing surface 14. The first positioning sealing surface 15 and the second positioning sealing surface 12 are used to achieve a secondary seal and can also achieve the positioning of the piston-type seal 9. In terms of positioning, the cylindrical sealing surface will not affect the sealing of the positioning sealing surface.

[0045] Specifically, the piston-type seal 9 is provided with a radially penetrating oil outlet hole 13, the diameter of which is larger than that of the partition 17. When the oil outlet hole 13 extends upward beyond the partition 17, it connects the upper chamber 26 and the lower chamber 27. This ensures that the piston-type seal 9 is always within the sealing seat 6, eliminating the need for repeated axial positioning.

[0046] Specifically, the first cylindrical sealing surface 16 and the second cylindrical sealing surface 14, and the first positioning sealing surface 15 and the second positioning sealing surface 12 are smooth surface clearance fit seals.

[0047] Specifically, the first positioning sealing surface 15 and the second positioning sealing surface 12 are arc-shaped surfaces, which facilitates cleaning and maintenance.

[0048] The first oil hole 20 is connected to the oil outlet line 5 via a sealing thread, and the second oil hole 24 is connected to the oil inlet line 10 via a sealing thread.

[0049] Furthermore, the sealing seat 6 includes a connecting ring and a seat ring. The seat ring is integrally formed on the upper end of the connecting ring. The inner wall of the connecting ring is provided with a first cylindrical sealing surface 16. The inner wall of the seat ring is an upward-facing first positioning sealing surface 15. The partition plate 17 is provided with a through threaded hole 21. The outer wall of the connecting ring is connected to the threaded hole 21 through a sealing thread. This makes the sealing seat 6 a detachable part, which is convenient for direct replacement after the seal fails.

[0050] Furthermore, the piston-type seal 9 includes a column and a positioning ring. The positioning ring is integrally provided at the upper end of the column. The outer wall of the column is a second cylindrical sealing surface 14. The column is provided with an oil outlet hole 13 through it in the radial direction. The outer wall of the positioning ring is a downward-facing second positioning sealing surface 12.

[0051] Furthermore, the pressure applying mechanism includes a self-pressurizing part and an active pressure applying part. The self-pressurizing part includes a spring 7, and a spring limiting ring is provided at the upper end of the positioning ring of the piston-type seal 9. The lower end of the spring 7 contacts the pressure applying end face 25 of the piston-type seal 9 within the spring limiting ring, and the upper end of the spring 7 contacts the upper end face of the upper cavity 26. The active pressure applying part includes a lead screw 4, which is connected to the upper plate of the upper cavity 26 through a sealing thread. By driving the lead screw 4, the lower end of the lead screw 4 contacts the pressure applying end face 25, thereby controlling the position of the piston-type seal 9.

[0052] Specifically, a flat pressure head is provided at the lower end of the lead screw 4, which contacts the pressure application end face 25. A clamping handle is provided at the upper end of the lead screw 4, which can be connected to a handwheel 8 for easy rotation of the lead screw 4.

[0053] Specifically, the top plate of the outer shell body 11, i.e. the upper plate of the upper cavity 26, is the upper cover 1. The upper cover 1 is provided with an upper cover flange 29. The upper end of the outer shell body 11 is provided with a flange ring 18. Both the upper cover flange 29 and the flange ring 18 are provided with fastening screw holes 19. The outer shell body 11 and the upper cover 1 are sealed and connected by bolts and sealing rings.

[0054] Specifically, the upper cover 1 is provided with mounting holes 28, which are sealed to the lead screw 4 through a lead screw sealing connector. The lead screw sealing connector can be a CN206555381U ball screw pair sealing gasket fixing structure, or other existing connectors that can achieve sealing connection and lead screw connection.

[0055] Preferably, the outer shell body 11 is a cylindrical body, the partition plate 17 has a threaded hole 21 at its center, and the upper cover 1 has a mounting hole 28 at its center.

[0056] Example 2:

[0057] Based on Embodiment 1, in this embodiment, the outer shell body 11 is provided with a cleaning hole 23 in the upper cavity 26 and a venting hole 22 in the lower cavity 27.

[0058] The cleaning hole 23 is connected to the cleaning gate 2 via a sealing thread, and the venting hole 22 is connected to the venting gate 3 via a sealing thread.

[0059] Specifically, the cleaning hole 23 is arranged opposite to the first oil hole 20, the vent hole 22 is arranged opposite to the second oil hole 24, and the first oil hole 20 and the second oil hole 24 are arranged opposite to each other.

[0060] In use, when oil enters the lower chamber 27 of the main body through the oil inlet line 10, and the lower chamber 27 is full, the piston-type seal 9 on the sealing seat 6 is lifted, the spring 7 is compressed, and the oil outlet 13 on the cylindrical sealing surface 14 rises out of the cylindrical sealing surface 16 of the sealing seat 6, so the oil enters the upper chamber 26. The oil is then discharged through the oil outlet line 5 for normal production.

[0061] When the oil supply stops, the pressure in the lower chamber 27 decreases, and the spring 7 acts on the pressure end face 25 of the piston seal 9, pressing the piston seal 9 downward. The oil outlet 13 enters the sealing seat 6, and the first cylindrical sealing surface 16 and the second cylindrical sealing surface 14 form a primary seal. When the pressure in the upper chamber 26 is high, the piston seal 9, under the action of pressure, has its first positioning sealing surface 15 and the second positioning sealing surface 12 squeezed to achieve a seal, thus realizing a secondary seal.

[0062] If there are impurities or wax crystals between the two positioning sealing surfaces or between the cylindrical sealing surfaces, the handwheel 1 is turned to make the screw 4 move downward, and the piston-type seal 9 is pressed down by mechanical pressure to forcefully remove the crystals or impurities on the first cylindrical sealing surface 16 and the second cylindrical sealing surface 14, and also to squeeze the impurities or crystals between the first positioning sealing surface 15 and the second positioning sealing surface 12, thereby sealing and achieving the sealing effect.

[0063] The vent gate 3 in the lower chamber 27 can be used to test the sealing effect of the check valve. The cleaning gate 2 in the upper chamber 26 can be used to clean various crystals, scale or other impurities by means of acid injection. If the piston-type check valve has been used for a long time and the sealing seat 6, piston-type seal 9 or other accessories are damaged, they can be removed and replaced to achieve the sealing conditions of a new check valve.

[0064] The above operations demonstrate that this achievement achieves sealing through multiple methods, including inspection, cleaning, and replacement, thereby improving the sealing performance of the piston-type check valve, reducing labor intensity, and increasing work efficiency and production rate.

[0065] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0066] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0067] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0068] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0069] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A piston-type check valve, comprising a housing body, wherein a partition is disposed within the housing body, the partition dividing the housing body into an upper chamber and a lower chamber, a first oil hole is disposed in the upper chamber, and a second oil hole is disposed in the lower chamber, characterized in that, The partition is provided with a sealing seat, and a piston-type seal is provided inside the sealing seat for sealing and sliding. The piston-type seal is provided with a connecting channel. The piston-type seal is always inside the sealing seat. When the piston-type seal moves upward, the connecting channel connects the upper cavity and the lower cavity. The outer casing is provided with a pressure-applying mechanism, which enables the piston-type seal to seal with the sealing seat.

2. The piston-type check valve according to claim 1, characterized in that, The connecting channel is an oil outlet hole. The piston-type seal is radially provided with an oil outlet hole. The diameter of the oil outlet hole is larger than the thickness of the partition plate. When the oil outlet hole extends upward out of the partition plate, the oil outlet hole connects the upper and lower chambers.

3. The piston-type check valve according to claim 2, characterized in that, The sealing seat has a through-hole at the center, and the sealing seat and the piston-type seal achieve a two-stage seal through the cylindrical sealing surface and the positioning sealing surface; The inner wall of the sealing seat is a first cylindrical sealing surface, and the upper end of the inner wall of the sealing seat is provided with an outwardly expanding first positioning sealing surface; The outer wall of the piston seal is a second cylindrical sealing surface, and the upper end of the outer wall of the piston seal is provided with an outwardly expanding second positioning sealing surface; The pressure-applying mechanism can seal the first cylindrical sealing surface with the second cylindrical sealing surface, or position and seal the first positioning sealing surface with the second positioning sealing surface.

4. The piston-type check valve according to claim 3, characterized in that, The first positioning sealing surface and the second positioning sealing surface are arc-shaped surfaces.

5. The piston-type check valve according to claim 3, characterized in that, The sealing seat includes a connecting ring and a seat ring, with the seat ring disposed at the upper end of the connecting ring; The inner wall of the connecting ring is provided with a first cylindrical sealing surface, and the inner wall of the seat ring is an upward-facing first positioning sealing surface; The partition plate is provided with a through threaded hole, and the outer wall of the connecting ring is connected to the threaded hole.

6. The piston-type check valve according to claim 3, characterized in that, The piston-type seal includes a column and a positioning ring, with the positioning ring provided at the upper end of the column; The outer wall of the column is a second cylindrical sealing surface, the column is provided with an oil outlet hole through the radial direction, and the outer wall of the positioning ring is a downward-facing second positioning sealing surface.

7. The piston-type check valve according to claim 6, characterized in that, The pressure application mechanism includes a self-pressure application part and an active pressure application part; The self-pressurizing part includes a spring, and the upper end of the positioning ring of the piston seal is provided with a spring limiting ring. The lower end of the spring contacts the pressure-applying end face of the piston seal within the spring limiting ring, and the upper end of the spring contacts the upper end face of the upper cavity. The active pressure application part includes a lead screw, which is connected to the upper plate of the upper cavity through a sealing thread. By driving the lead screw, the lower end of the lead screw contacts the pressure application end face, thereby controlling the position of the piston-type seal.

8. The piston-type check valve according to claim 1, characterized in that, The outer shell body has a cleaning hole in the upper cavity and a vent hole in the lower cavity.

9. The piston-type check valve according to claim 8, characterized in that, The first oil hole is connected to the oil outlet pipeline, and the second oil hole is connected to the oil inlet pipeline; The cleaning hole is connected to the cleaning gate, and the venting hole is connected to the venting gate.

10. The piston-type check valve according to claim 8, characterized in that, The cleaning hole is positioned opposite the first oil hole, the vent hole is positioned opposite the second oil hole, and the first oil hole is positioned opposite the second oil hole.

Images