Valve body for a plunger pump

Abstract

The application relates to a plunger pump valve body, which comprises a valve body base, the bottom surface of the valve body base is circular, the top surface of the valve body base is used for abutting against a spring arranged in a plunger pump, and the outer lateral wall of the valve body base is used for slidingly matching an inner cavity of the plunger pump; a plurality of guide bodies are directly connected to the bottom surface of the valve body base and are arranged at intervals in the circumferential direction defined by the axis of the valve body base. Each guide body is directly connected to the bottom surface of the valve body base, and there is no connecting structure between the valve body base and the guide body and no recess structure between the connecting structure and the valve body base, so that the rigidity of the valve body base is enhanced, the service life of the valve body is improved, the sliding phenomenon is eliminated, the friction between the valve body and a valve seat is reduced, and the service life of the valve body is improved.

Description

Technical Field

[0001] This application belongs to the field of oil and gas extraction equipment processing and manufacturing, specifically relating to a valve for a plunger pump. Background Technology

[0002] Hydraulic fracturing has gradually become a major production enhancement measure in oilfields. Under high pressure, fracturing fluid or sand-carrying fluid is pumped to the bottom of the well to achieve fracturing operations, thereby increasing oil and gas production. A key component of this method is the high-pressure plunger pump. The valve, as a crucial component of the hydraulic end of the plunger pump, undergoes a regular opening and closing motion with its seat during the pump's reciprocating motion, enabling the pumping of high-pressure fluid. However, the valve is subjected to prolonged erosion by the high-pressure fluid and constant impact with its seat during opening and closing. Furthermore, under extremely high pressure, the valve is prone to deformation and displacement, leading to increased friction between the valve and its seat. This is especially pronounced in sand-filled fracturing operations, where sand particles further exacerbate wear, resulting in a short service life and frequent pump replacements. In oilfield operations, replacing the hydraulic end pump not only wastes significant manpower and resources but also severely impacts operational efficiency.

[0003] In fracturing operations, the valve body, as a key component, undergoes regular opening and closing movements with the valve seat to achieve the pumping of high-pressure fluid. During the operation, it withstands the erosion of fracturing fluid containing particles such as quartz sand and ceramsite, making it a pump assembly product that requires frequent replacement. Each replacement of the pump assembly consumes a significant amount of manpower and resources, delays fracturing operations, and results in wasted time.

[0004] The structure of a valve in related technologies is as follows: Figure 1 and Figure 2 As shown, it includes three parts: valve body 1, guide body 2, and connecting structure 3. Figure 1 and Figure 2 The detailed working principle of the valve in the structure can be found in Chinese patent application CN117189577A. During the implementation of this valve structure, the applicant discovered that the connection between the guide body 2 and the connecting structure 3 suffered severe wear, resulting in a shorter-than-expected lifespan for the valve and increased replacement frequency. Utility Model Content

[0005] Therefore, it is necessary to propose a valve for plunger pumps that can improve service life.

[0006] A valve for a plunger pump includes: a valve base, the bottom surface of which is circular, the top surface of which abuts against a spring disposed within the plunger pump, and the outer side wall of which slides in conjunction with the inner cavity of the plunger pump; and a plurality of guides, each independently and directly connected to the bottom surface of the valve base, the plurality of guides being spaced apart in a circumferential direction defined by the axis of the valve base.

[0007] In some embodiments, a groove is provided at the connection between the outer side of the guide body and the bottom surface.

[0008] In some embodiments, the outer wall of the valve body includes a supporting cone surface connected to the bottom surface; the top end of the outer side of the guide is connected to the supporting cone surface, and the groove is formed at the connection.

[0009] In some embodiments, along the axial direction of the valve body, the outer surface of the guide includes a first segment, a second segment, and a third segment connected in sequence. The first segment is connected to the bottom surface and to the supporting cone surface. Along the radial direction of the valve body, the third segment is farther away from the axis of the valve body than the first segment.

[0010] In some embodiments, along the axial direction of the valve body, the outer surface of the guide includes sequentially connected arcuate segments and straight segments, the arcuate segments being connected to the bottom surface and the supporting cone surface, the arcuate segments forming the groove on the outer surface of the guide.

[0011] In some embodiments, a sealing ring groove is provided on the outer side wall of the valve body substrate, and the sealing ring groove is located between the top surface of the valve body substrate and the supporting cone surface; wherein, along the radial direction of the valve body substrate, the height of the top surface is greater than the height of the supporting cone surface.

[0012] In some embodiments, the top surface of the valve body is provided with an annular spring seat, and the annular spring seat is provided with a gripping part.

[0013] In some embodiments, the inner surface of the guide is an arc surface, which gradually extends from the bottom surface toward the side away from the axis of the valve body.

[0014] In some embodiments, the surface of the valve body of the plunger pump is coated with a corrosion-resistant alloy layer.

[0015] In some embodiments, the number of guide bodies is greater than or equal to two, and on a projection plane parallel to the axis of the valve body, the projected area of ​​the circumferential gap between adjacent guide bodies is greater than the projected area of ​​the guide bodies.

[0016] The aforementioned plunger pump uses a valve in which each guide element is directly connected to the bottom surface of the valve body. Compared to existing technologies, this eliminates the connection structure between the valve body and the guide elements, as well as the recessed structure between the connection structure and the valve body, thereby enhancing the rigidity of the valve body and extending its service life. Simultaneously, the increased rigidity of the valve body eliminates slippage, reducing friction between the valve body and the valve seat, further improving its service life. Furthermore, the omission of the connection structure allows for a larger liquid flow space and a higher flow rate; simultaneously, without the interference of the connection structure, the liquid flows out from the circumferential gaps, resulting in a uniform flow field. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of a valve in related technologies.

[0018] Figure 2 This is a schematic diagram of a half-section of a valve body in a related technology.

[0019] Figure 3 This is a three-dimensional structural diagram of a valve for a plunger pump according to an embodiment of this application.

[0020] Figure 4 This is a half-sectional schematic diagram of a valve body for a plunger pump according to an embodiment of this application.

[0021] Figure label:

[0022] 1. Valve body base; 11. Recessed structure; 2. Guide body; 3. Connecting structure; 100. Valve body for plunger pump; 10. Valve body base; 110. Top surface; 120. Bottom surface; 130. Outer side wall; 131. Support cone surface; 132. Sealing ring groove; 20. Guide body; 210. Outer side surface; 211. First section; 212. Second section; 213. Third section; 220. Groove; 230. Inner side surface; 30. Annular spring seat; 40. Gripping part; 50. Circumferential clearance. Detailed Implementation

[0023] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0024] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential direction" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the equipment or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0025] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] As described in the background art, Figure 1 and Figure 2 In the valve body of the related technology shown, the connection between the guide body 2 and the connecting structure 3 is severely worn, resulting in a valve body lifespan that is shorter than expected and an increased replacement frequency.

[0029] To this end, the applicant conducted in-depth research. Specifically, the applicant... Figure 1 and Figure 2 The valve operation was simulated and analyzed using Abaqus software. The simulation analysis revealed that the valves in the relevant technology slipped under pressure. The reason is that under high pressure, the existing valves, due to the presence of the connecting structure 3, have a large axial gap between the valve base 1 and the guide body 2. Furthermore, the connection point between the valve base 1 and the connecting structure 3 is machined into a recessed structure 11, resulting in insufficient stiffness of the valve base 1. Under high pressure, the outer edge of the valve base 1 will slip downwards, causing friction between this part and the valve seat. When performing sand-filled fracturing operations, sand is easily embedded at this location, and the entrainment of sand particles exacerbates the wear of the valve.

[0030] Therefore, this application proposes a valve 100 for a plunger pump, which can improve service life.

[0031] Specifically, refer to Figure 3 and Figure 4 The valve 100 for the plunger pump proposed in this application includes a valve base 10 and a plurality of guide bodies 20. Each of the plurality of guide bodies 20 is independently and directly connected to the bottom surface 120 of the valve base 10, and the plurality of guide bodies 20 are spaced apart in the circumferential direction.

[0032] The valve body base 10 has a top surface 110 and a bottom surface 120 along its axial direction. The top surface 110 abuts against a spring disposed within the plunger pump. The bottom surface 120 is circular. The bottom surface 120 is connected to the guide body 20. The circumferential direction mentioned in this application refers to the circumferential direction of the valve body base 10, which is the circumferential direction defined by the axis X of the valve body base 10, surrounding the axis X of the valve body base 10. The guide body 20 is used for sliding engagement with the inner wall of the valve seat. The outer wall 130 of the valve body base 10 is used for sliding engagement with the inner cavity of the plunger pump. Multiple guide bodies 20 may be identical or different. Specifically, all guide bodies 20 are identical, and the multiple guide bodies 20 are evenly distributed axially.

[0033] Each guide body 20 is independently and directly connected to the bottom surface 120 of the valve body 10, that is, there is no connection between them similar to the bottom surface 120 of the valve body 10. Figure 1 and Figure 2 Connection structure 3. Furthermore, there is no interconnection between the guide bodies 20 in the circumferential direction. In the circumferential direction of the valve body base 10, a circumferential gap 50 is formed between adjacent guide bodies 20. The circumferential gap 50 allows liquid to pass through.

[0034] Optionally, the outer wall 130 of the valve body base 10 is provided with a supporting conical surface 131. The supporting conical surface 131 is used to mate with the abutting conical surface at the top of the valve seat, so that the valve seat supports the valve body base 10. A sealing ring groove 132 is provided on the outer wall 130 of the valve body base 10, and the sealing ring groove 132 is located between the top surface 110 and the supporting conical surface 131. A sealing ring is placed in the sealing ring groove 132.

[0035] When the valve 100 is used in a plunger pump, it is located within the pump body. The guide body 20 slides against the inner wall of the valve seat. When the sealing ring abuts against the abutting conical surface on the valve seat, the sealing ring closes the channel in the valve seat. When the guide body 20 is subjected to liquid pressure towards the valve body base 10 that is greater than the resistance of the spring, the sealing ring separates axially from the valve seat, forming an axial gap. The circumferential gap 50 formed between two adjacent guide bodies 20 allows the channel in the valve seat to communicate with the internal space of the pump body, thereby enabling the pumping of high-pressure liquid. Specifically, the liquid flows into the internal space of the pump body sequentially through the circumferential gap 50 formed between the two guide bodies 20 and the axial gap between the sealing ring and the valve seat.

[0036] In this application, each guide body 20 is directly connected to the bottom surface 120 of the valve body base 10, and there is no connection between the valve body base 10 and the guide body 20 similar to... Figure 2 The connecting structure 3 and the recessed structure 11 enhance the rigidity of the valve body base 10, thereby increasing the service life of the valve. Simultaneously, the increased rigidity of the valve body base 10 eliminates the aforementioned slippage phenomenon, reducing friction between the valve and the valve seat, thus further extending the service life of the valve.

[0037] Furthermore, in related technologies, each guide body 20 is first connected to the connecting structure 3, and then connected to the valve body base 10 through the connecting structure 3. During the process of liquid flowing into the pump body space, the presence of the connecting structure 3 occupies a portion of the liquid flow space, thus affecting the flow rate and causing the flow field to be uneven. However, the solution of this application omits the connecting structure 3, resulting in a larger liquid flow space and a larger flow rate; at the same time, without the interference of the connecting structure 3, the liquid flows out from each circumferential gap 50, and the flow field can be uniform.

[0038] During the operation of the plunger pump, the valve body and valve seat undergo multiple relative movements in the axial direction. The valve seat exerts a "slapping" effect on the supporting cone surface 131 of the valve body. When the number of slapping events is high, burrs will appear on the supporting cone surface 131. When these burrs fall between the outer surface 210 of the guide body 20 and the inner wall of the channel in the valve seat, they will cause interference between the valve body and the valve seat, increasing friction and affecting the movement of the valve body. This may also make it difficult to remove the valve body when the pump is stopped.

[0039] Therefore, in some embodiments, reference is made to Figure 3 and Figure 4 A groove 220 is provided at the connection between the outer surface 210 of the guide body 20 and the bottom surface 120. The outer surface 210 of the guide body 20 is the side of the guide body 20 that faces away from the valve body base 10. The outer surface 210 of the guide body 20 is used to slide and engage with the inner wall of the valve seat.

[0040] This application provides a groove 220 at the connection between the outer surface 210 of the guide body 20 and the bottom surface 120. The groove 220 can accommodate fallen burrs, thereby preventing interference between the outer surface 210 of the guide body 20 and the inner wall of the channel in the valve seat.

[0041] In some embodiments, reference is made to Figure 3 and Figure 4 The outer wall 130 of the valve body 10 includes a supporting cone surface 131, which is connected to the bottom surface 120; the top end of the outer side surface 210 of the guide body 20 is connected to the supporting cone surface 131, and a groove 220 is formed at the connection.

[0042] The bottom end of the supporting conical surface 131 is connected to the bottom surface 120. The top end of the outer surface 210 of the guide body 20 is connected to the intersection of the bottom end and the bottom surface 120. In this way, the groove 220 is located below the supporting conical surface 131 and engages with it. As a result, burrs falling from the supporting conical surface 131 can smoothly enter into the groove 220 and be accommodated therein, thereby reducing friction between the guide body 20 and the valve seat.

[0043] There are various ways to form the groove 220. In some embodiments, refer to... Figure 4 Along the axial direction of the valve body 10, the outer surface 210 of the guide body 20 includes a first segment 211, a second segment 212 and a third segment 213 connected in sequence. The first segment 211 is connected to the bottom surface 120 and to the support cone surface 131. Along the radial direction of the valve body 10, the third segment 213 is farther away from the axis X of the valve body 10 than the first segment 211.

[0044] The outer surface 210 of the guide body 20 comprises three parts. The first section 211 connects to the junction of the support cone surface 131 and the bottom surface 120. The second section 212 is an inclined section, which causes the third section 213 and the first section 211 to be radially offset in the valve body base 10, with the third section 213 located on the outer side. Thus, at the top of the guide body 20, the first section 211, the second section 212, and the third section 213 together define the inner wall of the groove 220, forming the groove 220.

[0045] In other embodiments, the groove 220 is formed in such a way that, along the axial direction of the valve body 10, the outer surface 210 of the guide body 20 includes sequentially connected arcuate segments and straight segments, the arcuate segments being connected to the bottom surface 120 and to the support cone surface 131, the arcuate segments forming the groove 220 on the outer surface 210 of the guide body 20.

[0046] In this embodiment, it is equivalent to... Figure 3 and Figure 4 The first segment 211 and the second segment 212 are continuously arranged and have an inwardly concave arc surface, thereby defining the groove 220 mentioned above.

[0047] In some embodiments, reference is made to Figure 3 and Figure 4 A sealing ring groove 132 is provided on the outer wall 130 of the valve body 10. The sealing ring groove 132 is located between the top surface 110 and the supporting cone surface 131. The height of the top surface 110 is greater than the height of the supporting cone surface 131 along the radial direction of the valve body 10.

[0048] In this embodiment, a sealing ring groove 132 and a supporting cone surface 131 are provided on the outer wall 130 of the valve body base 10, and the height of the top surface 110 is greater than the height of the supporting cone surface 131. When the sealing ring is assembled in the sealing ring groove 132, the top surface 110 can limit the sealing ring on one side, so that when the other side of the sealing ring impacts the top of the valve seat, the sealing ring can be supported by the top surface 110.

[0049] This design eliminates the need for a separate baffle on the valve body 10 to limit the sealing ring, resulting in a simpler structure for the valve body 100 used in the plunger pump.

[0050] In some embodiments, reference is made to Figure 3 and Figure 4 The top surface 110 of the valve body base 10 is provided with a ring spring seat 30, and the ring spring seat 30 is provided with a gripping part 40. The ring spring seat 30 allows the spring to be sleeved on it. The gripping part 40 facilitates gripping the valve body to remove the plunger pump valve body 100 from the valve seat.

[0051] In some embodiments, reference is made to Figure 3 and Figure 4 The inner surface 230 of the guide body 20 is an arc surface, which gradually extends from the bottom surface 120 toward the side away from the axis X of the valve body 10. The top end of the arc surface is connected to the bottom surface 120, and the end end of the arc surface is offset toward the side away from the axis X of the valve body 10, so as to guide the liquid to flow toward the valve body 10.

[0052] In some embodiments, the surface of the plunger pump valve 100 is coated with a corrosion-resistant alloy layer. This corrosion-resistant alloy layer is, for example, a nickel-phosphorus alloy layer, thereby slowing down the corrosion rate of the plunger pump valve 100 and increasing its service life.

[0053] In some embodiments, the number of guide bodies 20 is greater than or equal to two; on the projection plane parallel to the axis X of the valve body 10, the projected area of ​​the circumferential gap 50 between adjacent guide bodies 20 is greater than the projected area of ​​the guide body 20.

[0054] refer to Figure 4 Specifically, there are four guide bodies 20. This allows for a greater number of guide bodies 20 to slide and engage with the valve seat, improving stability. The size of the circumferential gap 50 between adjacent guide bodies 20 determines the size of the flow channel area for liquid to flow from the valve seat into the pump body. In this application, the projected area of ​​the circumferential gap 50 between adjacent guide bodies 20 is larger than the projected area of ​​the guide body 20. This results in a smaller space occupied by the guide body 20 and a larger flow channel area for liquid to flow from the valve seat into the pump body, thus ensuring flow rate.

[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A valve body for a plunger pump, characterized by The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body.

2. The valve body for a plunger pump of claim 1, wherein, The application relates to a plunger pump valve body.

3. The valve body for a plunger pump of claim 2, wherein, The application relates to a plunger pump valve body.

4. The valve body for a plunger pump of claim 3, wherein, The application relates to a plunger pump valve body.

5. The valve body for a plunger pump of claim 3, wherein, The application relates to a plunger pump valve body.

6. The valve body for a plunger pump of claim 3, wherein, The application relates to a plunger pump valve body.

7. The valve body for a plunger pump of claim 1, wherein, The application relates to a plunger pump valve body.

8. The valve body for a plunger pump of claim 1, wherein, The application relates to a plunger pump valve body.

9. The valve body for a plunger pump of claim 1, wherein, The application relates to a plunger pump valve body.

10. The valve body for a plunger pump of claim 1, wherein, The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve body. The application relates to a plunger pump valve

Images