Valve spring seat and plunger pump

Abstract

The utility model relates to a valve spring seat and a plunger pump. The plunger pump comprises a valve box and a valve spring seat, a supporting groove is formed in the valve box, the valve spring seat comprises a body, a first supporting part and a second supporting part, the first supporting part and the second supporting part are connected to the two ends of the body in the first direction, and the edges of the two opposite ends of the first supporting part in the second direction are provided with a first upper supporting face and a first lower supporting face correspondingly. The edges of the two opposite ends of the second supporting part in the second direction are provided with a second upper supporting face and a second lower supporting face respectively, the first upper supporting face and the second upper supporting face abut against the upper limiting step of the supporting groove, and the first lower supporting face and the second lower supporting face abut against the lower limiting step of the supporting groove. The valve spring seat is arranged in the supporting groove, so that the valve spring seat can still be kept in the supporting groove even if the valve spring is broken due to accidents, and the phenomenon that parts such as a valve box, a plunger pump or the valve spring seat are damaged due to the fact that the valve spring seat falls off from the supporting groove and easily collides with the plunger after being overturned can be avoided.

Description

Technical Field

[0001] This application relates to the field of oil and gas extraction equipment technology, and in particular to a valve spring seat and a plunger pump. Background Technology

[0002] In the field of oil and gas extraction, fracturing operations are frequently required. Fracturing is a technique that uses high-pressure fracturing fluid to create fractures in oil and gas reservoirs during oil or gas production. Typically, fracturing equipment includes a prime mover and a plunger pump. The prime mover provides mechanical power to the plunger pump, which uses a crankshaft connecting rod mechanism to convert the rotational motion of the crankshaft into the reciprocating motion of the plunger. The reciprocating motion of the plunger within the valve box pressurizes the fluid, thereby achieving high-pressure pumping of the fracturing medium during fracturing operations.

[0003] The valve body, valve spring, and valve spring seat are the main components of the hydraulic end of a plunger pump. During the reciprocating motion of the plunger pump, the valve body performs regular opening and closing movements to pump high-pressure liquids; the valve spring seat serves to fix and limit the spring compression, and control the opening height of the valve body. Therefore, the stability of the valve spring seat is crucial, requiring it to remain in its original position throughout the plunger pump's operation. However, existing valve spring seats have certain structural defects, meaning that if the valve spring breaks due to an accident, the valve spring seat will detach from its original position. This causes the plunger to collide with the detached valve spring seat during reciprocating motion, ultimately damaging components such as the valve box, plunger, gland, and valve spring seat, resulting in very serious consequences. Utility Model Content

[0004] Based on this, the purpose of this application is to provide a valve spring seat and a plunger pump including the valve spring seat, so as to solve the problem that the existing valve spring seat is easy to fall out of its original position when the spring breaks, which makes the valve spring seat easy to collide with the plunger, thereby damaging the plunger or valve spring seat and other components.

[0005] According to one aspect of this application, a valve spring seat is provided, comprising:

[0006] ontology;

[0007] A first support portion and a second support portion are connected to opposite ends of the body in a first direction; the opposite ends of the first support portion in a second direction have a first upper support surface and a first lower support surface, respectively; the opposite ends of the second support portion in the second direction have a second upper support surface and a second lower support surface, respectively.

[0008] The central axis of the body extends along the second direction, and the first direction is perpendicular to the second direction.

[0009] In one embodiment, the distance between the first upper support surface and the first lower support surface gradually decreases in the direction of the central axis pointing to the first support portion; and / or, the distance between the second upper support surface and the second lower support surface gradually decreases in the direction of the central axis pointing to the second support portion.

[0010] In one embodiment, the valve spring seat further includes an elastic element with one end connected to the body; the elastic element includes a first elastic portion and a second elastic portion, the first elastic portion and the second elastic portion forming a first included angle; one end of the first elastic portion is connected to the body, and the other end is connected to the second elastic portion, the end of the second elastic portion away from the first elastic portion is used to bear external force, so that the elastic element can produce a recoverable deformation under the action of the external force.

[0011] In one embodiment, the angle of the first included angle is in the range of 90° to 120°.

[0012] In one embodiment, the second elastic portion includes a straight segment and a bent segment, one end of the straight segment being connected to the connecting portion and the other end being connected to the bent segment, the bent segment being bent relative to the straight segment toward a direction close to the central axis.

[0013] In one embodiment, the valve spring seat has a first side and a second side disposed opposite to each other along the second direction, and a limiting groove is formed on the surface of the first side or the second side, wherein a portion of the elastic element is limited in the limiting groove.

[0014] In one embodiment, the surface of the body facing the first side is defined as a first surface, and the surface of the first support or the second support facing the first side is defined as a second surface. The first surface and the second surface form a second angle, and the angle of the second angle is greater than or equal to the angle of the first angle.

[0015] The limiting groove includes a first limiting groove and a second limiting groove that are interconnected. The first limiting groove is formed on the first surface, and the second limiting groove is formed on the second surface. The first elastic portion is located in the first limiting groove, and the second elastic portion is located in the second limiting groove.

[0016] In one embodiment, the body has a through hole that connects to the first limiting groove, and a limiting pin passes through the through hole. The limiting pin is used to limit the displacement of the first elastic part in the second direction.

[0017] According to another aspect of this application, a plunger pump is provided, comprising:

[0018] A valve box, wherein a first cavity and a second cavity are connected to each other, and a support groove extending circumferentially along the wall of the first cavity is provided; the groove wall of the support groove has an upper limit step and a lower limit step that are spaced apart from each other along the axial direction of the support groove.

[0019] A plunger is movably inserted into the second cavity from one end of the second cavity;

[0020] A valve body is movably disposed within the first cavity;

[0021] As described in any of the above embodiments, the valve spring seat is disposed in the support groove and connected to the valve body, the first upper support surface and the second upper support surface of the valve spring seat abut against the upper limit step, and the first lower support surface and the second lower support surface of the valve spring seat abut against the lower limit step.

[0022] In one embodiment, the cavity wall of the second cavity has a limiting groove, and the valve spring seat has an elastic element with one end connected to the body. The end of the elastic element away from the body is engaged in the limiting groove to restrict the valve spring seat from rotating in the circumferential direction defined by the central axis.

[0023] The aforementioned valve spring seat and the plunger pump including the valve spring seat have a first support portion and a second support portion provided at opposite ends of the valve spring seat body along a first direction. A first upper support surface and a first lower support surface are respectively provided at opposite ends of the first support portion along a second direction perpendicular to the first direction, and a second upper support surface and a second lower support surface are respectively provided at opposite ends of the second support portion along the second direction. This allows the valve spring seat to remain in the support groove when installed in the valve box of the hydraulic end of the plunger pump. The first upper support surface and the second upper support surface can abut against the upper limit step of the support groove in the valve box, and the second lower support surface can abut against the lower limit step of the support groove. This ensures that the valve spring seat remains in the support groove and does not fall out. Even if the valve spring breaks due to an accident, the valve spring seat will still remain in the support groove. Therefore, it avoids the phenomenon that the valve spring seat, after falling out of the support groove and overturning, could easily collide with the plunger, causing damage to the valve box, the plunger pump, or other components. Attached Figure Description

[0024] Figure 1 A cross-sectional view of a plunger pump provided in an embodiment of this application.

[0025] Figure 2 This is a cross-sectional view of the valve box in a plunger pump provided in an embodiment of this application.

[0026] Figure 3 A cross-sectional view of a valve spring seat provided in an embodiment of this application.

[0027] Figure 4 A cross-sectional view of a valve spring seat installed in a valve box according to an embodiment of this application. Figure 1 .

[0028] Figure 5 A cross-sectional view of a valve spring seat installed in a valve box according to an embodiment of this application. Figure 2 (When the spring breaks).

[0029] Figure 6 A cross-sectional view of a valve spring seat installed in a valve box according to an embodiment of this application. Figure 2 (When the spring breaks and the valve spring seat overturns).

[0030] Figure 7 A cross-sectional view of a valve spring seat provided for another embodiment of this application.

[0031] Figure 8 A side view of a valve spring seat provided for another embodiment of this application.

[0032] Figure 9 A cross-sectional view of a valve spring seat installed in a valve box according to another embodiment of this application. Figure 1 (The valve spring seat is in the upper limit position).

[0033] Figure 10 A cross-sectional view of a valve spring seat installed in a valve box according to another embodiment of this application. Figure 2 (The valve spring seat is in the lower limit position).

[0034] Figure 11 A cross-sectional view of a valve spring seat installed in a valve box according to another embodiment of this application. Figure 1 (The valve spring has not yet been compressed).

[0035] Figure 12 A cross-sectional view of a valve spring seat installed in a valve box according to another embodiment of this application. Figure 1 (The valve spring is compressed.)

[0036] Explanation of reference numerals in the attached figures:

[0037] 10. Plunger pump; 100. Valve box; 101. First chamber; 102. Second chamber; 103. Drain port; 104. Support groove; 104a. Upper limit step; 104b. Lower limit step; 105. Limiting groove; 200. Plunger; 300. Valve spring seat; 301. Upper support surface; 302. Limiting groove; 302a. First limiting groove; 302b. Second limiting groove; 310. Body; 311. First surface; 312. Fixing hole; 320, first support part; 321, second surface; 322, first upper support surface; 323, first lower support surface; 330, second support part; 331, second upper support surface; 332, second lower support surface; 340, elastic element; 341, first elastic part; 342, second elastic part; 3421, straight segment; 3422, bent segment; 400, valve body; 500, valve spring; 700, valve seat; 800, limit pin. Detailed Implementation

[0038] 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.

[0039] 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", "second direction", "first direction", "circumferential", etc. 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 device or component 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0044] This application provides a valve spring seat 300 and a plunger pump 10, such as Figure 1 As shown, the plunger pump 10 includes a valve box 100, a plunger 200, a valve spring seat 300, and a valve body 400. The plunger 200, valve spring seat 300, and valve body 400 are installed inside the valve box 100. The plunger 200 is used to pressurize the liquid inside the valve box 100. By causing the valve body 400 to reciprocate regularly, high-pressure pumping of the liquid is achieved. The valve spring seat 300 connects the valve body 400 and controls the opening height of the valve body 400.

[0045] The following description uses the application of the plunger pump 10 in fracturing equipment for oil and gas field development as an example to illustrate the structure of the plunger pump 10 and the valve spring seat 300 provided in this application. This embodiment is only used as an example and does not limit the technical scope of this application. It is understood that in other embodiments, the plunger pump 10 of this application is not limited to fracturing equipment for oil and gas field development, but can also be used in any equipment that requires pumping liquids, and is not limited here.

[0046] Please see Figure 1 and Figure 2 In one specific embodiment, the valve box 100 has a first cavity 101 and a second cavity 102 that are interconnected and perpendicular to each other. The second cavity 102 extends along a first direction (X direction shown in the figure), and the first cavity 101 extends along a second direction perpendicular to the first direction (Y direction shown in the figure). The plunger 200 is movably inserted into the second cavity 102 from one end. There are two valves 400, and both valves 400 are movably disposed in the first cavity 101 and block the openings at opposite ends of the first cavity 101. The cavity wall of the first cavity 101 has a support groove 104 that extends circumferentially along the first cavity 101. The valve spring seat 300 is disposed in the support groove 104 and connected to the valve 400 located below by a spring.

[0047] When the plunger pump 10 is working, the lower valve 400 opens, and the liquid enters the first chamber 101 and the second chamber 102 of the valve box 100. Then, under the compression of the plunger 200, the liquid is compressed to a certain pressure. When the pressure reaches a certain level, the upper valve 400 will open, and the liquid will be discharged from the drain port 103, thereby realizing the pumping of high-pressure liquid.

[0048] In order to fix the valve spring seat 300 in the support groove 104, combined with Figure 2 , Figure 3 and Figure 4As shown, the groove wall of the support groove 104 has an upper limit step 104a and a lower limit step 104b that are spaced apart from each other along the axial direction of the support groove 104. One end of the first cavity 101 is provided with a valve seat 700. The valve spring seat 300 includes a body 310, a first support part 320 and a second support part 330. The first support part 320 and the second support part 330 are disposed at opposite ends of the body 310 along the first direction. The first support part 320 and the second support part 330 have an upper support surface 301 at one end edge along the second direction. The central axis of the body 310 extends along the second direction. Therefore, when the valve body 400 moves upward along the second direction, one end of the first cavity 101 opens, and the upper support surface 301 of the valve spring seat 300 is fixed in the support groove 104 by the abutment of the upper limit step 104a; when the valve body 400 moves downward along the second direction, one end of the first cavity 101 closes, and the valve body 400 abuts against the valve seat 700. Since the valve body 400 is connected to the valve spring seat 300 by a spring, the valve spring seat 300 can also be fixed in the support groove 104 at this time.

[0049] However, as described in the background section, the valve spring seat 300 of the above embodiments has certain structural defects, such as... Figure 5 and Figure 6 As shown, since the valve spring seat 300 has no support at the bottom along the second direction in the figure, once the valve spring 500 breaks due to an accident, the valve spring seat 300 will come out of its original position (in the support groove 104). Although the lower limit step 104b can also abut against the first support part 320 and the second support part 330 of the valve spring seat 300 to prevent the valve spring seat 300 from falling further, at this time the valve spring seat 300 may interfere with the plunger 200, causing the plunger 200 to easily collide with the dislodged valve spring seat 300 and overturn when it is reciprocating, ultimately causing damage to components such as the valve box 100, the plunger 200, the gland, and the valve spring seat 300, resulting in very serious consequences.

[0050] To solve the above problems, the applicant devised an improvement to the structure of the valve spring seat 300, such as... Figure 7 and Figure 8As shown, this is the structure of the improved valve spring seat 300. In this embodiment, the valve spring seat 300 also includes a body 310, a first support portion 320, and a second support portion 330. The extension directions of the first and second directions are consistent with the previous embodiment described above. The first support portion 320 and the second support portion 330 are connected to the opposite ends of the body 310 in the first direction. Unlike the previous embodiment, the opposite ends of the first support portion 320 in the second direction have a first upper support surface 322 and a first lower support surface 323, respectively. The opposite ends of the second support portion 330 in the second direction have a second upper support surface 331 and a second lower support surface 332, respectively.

[0051] Thus, when the valve spring seat 300 is set in the support groove 104, as... Figure 9 As shown, when the valve spring seat 300 is in the upper limit position, the first upper support surface 322 and the second upper support surface 331 can abut against the upper limit step 104a; as Figure 10 As shown, when the valve spring seat 300 is in the lower limit position, the first lower support surface 323 and the second lower support surface 332 can abut against the lower limit step 104b. In this case, even if the valve spring 500 breaks due to an accident, the first lower support surface 323 and the second lower support surface 332 can still abut against the lower limit step 104b, so that the valve spring seat 300 can always be confined in the support groove 104 without significant tilting. This structurally avoids the problem of the valve spring seat 300 easily falling out of the support groove 104 in the previous embodiment, thus preventing damage to components such as the valve box 100, plunger 200, valve spring seat 300, and gland.

[0052] Furthermore, to prevent the edges of the upper limit step 104a and the lower limit step 104b from being too sharp and scratching the valve spring seat 300, the step surfaces of the upper limit step 104a and the lower limit step 104b are inclined chamfered. To match the inclined chamfer and thus achieve a better fit, the first upper support surface 322, the first lower support surface 323, the second upper support surface 331, and the second lower support surface 332 are also inclined. Specifically, in the direction from the central axis to the first support portion 320, the distance between the first upper support surface 322 and the first lower support surface 323 gradually decreases, and / or the distance between the second upper support surface 331 and the second lower support surface 332 also gradually decreases.

[0053] Please continue reading. Figure 11 and Figure 12 In a preferred embodiment, a limiting groove 105 located above the support groove 104 is formed on the cavity wall at the junction of the first cavity 101 and the second cavity 102. Correspondingly, combined with Figure 9 and Figure 10As shown, the valve spring seat 300 also includes an elastic element 340 with one end connected to the body 310. The end of the elastic element 340 away from the body 310 is engaged in the limiting groove 105 to restrict the valve spring seat 300 from rotating in the circumferential direction defined by the central axis of the body 310.

[0054] Specifically, such as Figure 7 and Figure 8 As shown, the elastic element 340 is a retaining ring, which includes a first elastic part 341 and a second elastic part 342. One end of the first elastic part 341 is connected to the body 310, and the other end is connected to the second elastic part 342. The end of the second elastic part 342 away from the first elastic part 341 is used to engage in the limiting groove 105 to withstand the external force exerted on the elastic element 340 by the groove wall of the limiting groove 105, thereby enabling the elastic element 340 to produce a recoverable deformation under the action of external force. Because the elastic element 340 can produce a recoverable deformation, when it is necessary to disassemble the valve spring seat 300, it is only necessary to rotate the valve spring seat 300 by an angle so that the elastic deformation produced by the elastic element 340 can disengage the end of the second elastic part 342 from the limiting groove 105; when it is necessary to install the valve spring seat 300, it is only necessary to rotate the valve spring seat 300 in the opposite direction by an angle so that the elastic deformation produced by the elastic element 340 can be slightly restored so that the end of the second elastic part 342 can engage in the limiting groove 105.

[0055] In a preferred embodiment, the first elastic portion 341 and the second elastic portion 342 form a first included angle, allowing the second elastic portion 342 to generate a larger elastic deformation relative to the first elastic portion 341. More preferably, the angle range of the first included angle is between 90° and 120°. Thus, by setting the above-mentioned angle range, the second elastic portion 342 can generate a larger elastic deformation relative to the first elastic portion 341. After the end of the second elastic portion 342 disengages from the limiting groove 105, the second elastic portion 342 can continue to generate elastic deformation within the elastic deformation range and re-engage in the limiting groove 105, avoiding the situation where the second elastic portion 342 cannot be locked in the limiting groove 105 due to permanent deformation.

[0056] Based on this, as a further improvement, the second elastic part 342 includes a straight segment 3421 and a bent segment 3422. One end of the straight segment 3421 is connected to the first elastic part 341, and the other end is connected to the bent segment 3422. The bent segment 3422 is bent at an angle relative to the straight segment 3421 toward the direction closer to the central axis. The purpose of this design is to avoid scratching the inner wall of the valve box 100 due to the end of the second elastic part 342 being too sharp.

[0057] It is understood that the elastic element 340 is not limited to a snap ring, but can also be other elements capable of elastic deformation, which are not limited here.

[0058] Furthermore, in order to avoid excessive wobbling of the valve spring seat 300, in some preferred embodiments, the valve spring seat 300 has a first side and a second side arranged opposite to each other along a second direction. A limiting groove 302 is formed on the surface of the first side or the second side, and the elastic element 340 is partially confined in the limiting groove 302. This can limit the elastic element 340 from wobbling significantly, and thus the valve spring seat 300 can be more firmly fixed in the support groove 104.

[0059] In a specific embodiment, the surface of the body 310 facing the first side is defined as the first surface 311, and the surface of the first support portion 320 facing the first side is defined as the second surface 321. The first surface 311 and the second surface 321 form a second included angle, the angle of the second included angle being greater than or equal to the angle of the first included angle. The limiting groove 302 includes a first limiting groove 302a and a second limiting groove 302b that are interconnected. The first limiting groove 302a is formed on the first surface 311, and the second limiting groove 302b is formed on the second surface 321. The first elastic portion 341 is limited in the first limiting groove 302a, and the second elastic portion 342 is partially limited in the second limiting groove 302b.

[0060] Thus, by providing a first surface 311 and a second surface 321 that are at an angle to each other on the main body 310 and the second support portion 330 respectively, the first elastic portion 341 and the second elastic portion 342 that are at an angle to each other can both be limited in a third direction that is perpendicular to both the first and second directions, thus solving the problem that the bent elastic element 340 is not easy to be limited.

[0061] Of course, the surface of the second support 330 facing the first side can also be defined as the second surface 321, without any particular limitation.

[0062] Furthermore, based on the above embodiments, the main body 310 also has a through hole that connects to the first limiting groove 302a, and a limiting pin 800 is inserted in the through hole. The limiting pin 800 is used to limit the displacement of the first elastic part 341 in the second direction, so that the first elastic part 341 can be completely restricted in the first limiting groove 302a and cannot move freely.

[0063] In addition, such as Figure 7 As shown, the body 310 also has a fixing hole 312 on the bottom wall of the first limiting groove 302a. The part of the first elastic part 341 that is away from the second elastic part 342 is also bent at an angle and inserted into the fixing hole 312, so that the elastic element 340 can be firmly connected to the body 310.

[0064] The following describes the installation process of the valve spring seat 300 provided in the embodiments of this application:

[0065] First, such as Figure 11 As shown, the valve spring seat 300 is installed onto the valve spring 500 along the first cavity 101 of the valve box 100;

[0066] Then, as Figure 12 As shown, use a tool to slightly press down the valve spring seat 300 to compress the valve spring 500. Rotate the valve spring seat 300 by an angle so that the part of the second elastic part 342 in the elastic element 340 exposed in the second limiting groove 302b is engaged in the limiting groove 105.

[0067] Finally, under the elastic force of the valve spring 500, the first upper support surface 322 and the second upper support surface 331 of the valve spring seat 300 abut against the upper limit step 104a, thereby completing the installation.

[0068] When disassembling the valve spring seat 300, simply follow the reverse steps.

[0069] 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.

[0070] The embodiments described above are merely illustrative of 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 spring seat, characterized by The valve spring seat comprises: a body (310); a first support portion (320) and a second support portion (330) connected to opposite ends of the body (310) in a first direction; opposite end edges of the first support portion (320) in a second direction respectively have a first upper support surface (322) and a first lower support surface (323); opposite end edges of the second support portion (330) in the second direction respectively have a second upper support surface (331) and a second lower support surface (332); wherein a central axis of the body (310) extends along the second direction, and the first direction is perpendicular to the second direction.

2. The valve spring seat of claim 1 wherein, In a direction in which the central axis points to the first support portion (320), a distance between the first upper support surface (322) and the first lower support surface (323) gradually decreases; and / or, in a direction in which the central axis points to the second support portion (330), a distance between the second upper support surface (331) and the second lower support surface (332) gradually decreases.

3. The valve spring seat of claim 1 wherein, The valve spring seat further comprises an elastic element (340) connected to the body (310) at one end; the elastic element (340) comprises a first elastic portion (341) and a second elastic portion (342), and the first elastic portion (341) and the second elastic portion (342) form a first included angle; one end of the first elastic portion (341) is connected to the body (310), and the other end is connected to the second elastic portion (342); the second elastic portion (342) is away from the one end of the first elastic portion (341) and is used for bearing an external force, so that the elastic element (340) can produce recoverable deformation under the action of the external force.

4. The valve spring seat of claim 3 wherein, The first included angle ranges from 90° to 120°.

5. The valve spring seat of claim 3 wherein, The second elastic portion (342) comprises a straight section (3421) and a bent section (3422); one end of the straight section (3421) is connected to the first elastic portion (341), and the other end is connected to the bent section (3422); the bent section (3422) is bent towards the central axis.

6. The valve spring seat of claim 3 wherein, The valve spring seat has a first side and a second side oppositely arranged along the second direction; a surface of the first side or the second side is provided with a limiting groove (302); and the elastic element (340) is partially limited in the limiting groove (302).

7. The valve spring seat of claim 6 wherein, A surface of the body (310) towards the first side defines a first surface (311); a surface of the first support portion (320) or the second support portion (330) towards the first side defines a second surface (321); the first surface (311) and the second surface (321) form a second included angle; and an angle of the second included angle is greater than or equal to an angle of the first included angle. The limiting groove (302) includes a first limiting groove (302a) and a second limiting groove (302b) that are interconnected. The first limiting groove (302a) is formed on the first surface (311), and the second limiting groove (302b) is formed on the second surface (321). The first elastic part (341) is located in the first limiting groove (302a), and the second elastic part (342) is partially located in the second limiting groove (302b).

8. The valve spring seat of claim 7, wherein The body (310) has a through hole that connects to the first limiting groove (302a), and a limiting pin (800) is inserted in the through hole. The limiting pin (800) is used to limit the displacement of the first elastic part (341) in the second direction.

9. A piston pump characterized in that include: A valve box (100) has a first cavity (101) and a second cavity (102) that are interconnected. The cavity wall of the first cavity (101) has a support groove (104) that extends circumferentially along the first cavity (101). The groove wall of the support groove (104) has an upper limit step (104a) and a lower limit step (104b) that are spaced apart from each other along the axial direction of the support groove (104). A plunger (200) is movably inserted into the second cavity (102) from one end; A valve body (400) is movably disposed in the first cavity (101); The valve spring seat (300) as described in any one of claims 1-8 is disposed in the support groove (104) and connected to the valve body (400), the first upper support surface (322) and the second upper support surface (331) of the valve spring seat (300) abut against the upper limit step (104a), and the first lower support surface (323) and the second lower support surface (332) of the valve spring seat (300) abut against the lower limit step (104b).

10. The piston pump of claim 9, wherein, The cavity wall of the second cavity (102) is provided with a limiting groove (105). The valve spring seat (300) has an elastic element (340) with one end connected to the body (310). The end of the elastic element (340) away from the body (310) is engaged in the limiting groove (105) to restrict the valve spring seat (300) from rotating in the circumferential direction defined by the central axis.

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