Plunger-pump fluid end and plunger pump

Abstract

A plunger-pump fluid end, relating to the technical field of oil and gas field fracturing equipment. The plunger-pump fluid end comprises a valve housing (110), a plunger (120), a suction gland (130), a wear-proof sleeve (140) and a first seal ring (150), wherein the valve housing (110) has an accommodating cavity (111) and a suction port (112) that are in communication with each other, the plunger (120) is partially movably arranged in the accommodating cavity (111), the suction gland (130) is detachably arranged in the suction port (112), a positioning groove (112a) is provided in an inner wall of the suction port (112), the wear-proof sleeve (140) is arranged in the positioning groove (112a), the first seal ring (150) is sleeved on the suction gland (130), and the suction gland (130) is in sealing fit with the wear-proof sleeve (140) by means of the first seal ring (150), thereby improving the sealing performance of the accommodating cavity (111).

Description

Plunger pump fluid end and plunger pump

[0001] Cross-references

[0002] This application claims priority to a Chinese patent application filed with the Patent Office of China on January 2, 2024, with application number 202420022789.X and utility model name “Plunger Pump Hydraulic End and Plunger Pump”. The entire contents of the application are incorporated herein by reference. Technical Field

[0003] The present application belongs to the technical field of oil and gas field fracturing equipment, and specifically relates to a plunger pump hydraulic end and a plunger pump. Background Art

[0004] Hydraulic cementing is the main method of cementing operations in oil and gas fields. It generates high pressure through a plunger pump and pumps cement slurry to the bottom of the well under high pressure to achieve cementing operations. The plunger pump consists of a power end and a hydraulic end. During the cementing operation, the crank-connecting rod mechanism in the power end drives the plunger in the hydraulic end to reciprocate, thereby achieving high-pressure pumping of cement slurry.

[0005] The hydraulic end consists of a valve box, plunger, suction gland, discharge gland, and sealing ring. As the plunger reciprocates, the pressure of the medium within the valve box fluctuates, creating an alternating load. When the hydraulic end is operating, the sealing ring, which seals with the suction gland, moves back and forth continuously under the action of the alternating load. Because the medium contains fracturing sand, the sealing ring will carry this fracturing sand and wear the valve box. Over time, grooves will form on the sealing surface of the valve box's suction end, making it unable to seal the high-pressure medium within. Consequently, the hydraulic end becomes unusable, affecting work efficiency at the job site. Summary of the Invention

[0006] The purpose of the embodiments of the present application is to provide a plunger pump hydraulic end and a plunger pump.

[0007] In the first aspect, an embodiment of the present application provides a hydraulic end of a plunger pump, comprising a valve box, a plunger, a suction pressure cover, a wear-resistant sleeve and a first sealing ring, wherein the valve box has a connected accommodating chamber and a suction port, part of the plunger is movably arranged in the accommodating chamber, the suction pressure cover is detachably arranged in the suction port, the inner wall of the suction port is provided with a positioning groove, the wear-resistant sleeve is arranged in the positioning groove, the first sealing ring is sleeved on the suction pressure cover, and the suction pressure cover is sealed with the wear-resistant sleeve through the first sealing ring.

[0008] In a second aspect, an embodiment of the present application further provides a plunger pump, comprising a plunger pump power end and the above-mentioned plunger pump hydraulic end, wherein the crank-connecting rod mechanism of the plunger pump power end is connected to the plunger of the plunger pump hydraulic end. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG1 is a schematic structural diagram of the hydraulic end of a plunger pump disclosed in the first embodiment of the present application;

[0010] FIG2 is an enlarged view of the local structure of FIG1;

[0011] FIG3 is a schematic structural diagram of the hydraulic end of the plunger pump disclosed in the second embodiment of the present application;

[0012] FIG4 is an enlarged view of the local structure of FIG3;

[0013] FIG5 is a schematic structural diagram of the hydraulic end of the plunger pump disclosed in the third embodiment of the present application;

[0014] FIG6 is an enlarged view of the local structure of FIG5;

[0015] FIG7 is a schematic structural diagram of the hydraulic end of a plunger pump disclosed in a fourth embodiment of the present application;

[0016] FIG8 is an enlarged view of the local structure of FIG7;

[0017] FIG9 is a schematic structural diagram of the hydraulic end of the plunger pump disclosed in the fifth embodiment of the present application;

[0018] FIG10 is an enlarged view of the local structure of FIG9 .

[0019] Explanation of the accompanying drawings: 110-valve box, 111-accommodating chamber, 112-suction port, 112a-positioning groove, 112b-accommodating groove, 113-discharge port, 120-plunger, 130-suction pressure cover, 140-wear-resistant sleeve, 141-mounting groove, 150-first sealing ring, 160-retaining ring, 170-second sealing ring, 180-weldment, 190-suction pressure cap, 210-packing sealing assembly, 211-packing box, 212-packing pressure cap, 220-upper valve seat, 230-upper valve body, 240-lower valve seat, 250-lower valve body, 260-discharge pressure cover, 270-discharge pressure cap, 280-third sealing ring, 290-elastic bracket. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0021] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0022] The following describes in detail the plunger pump hydraulic end and the plunger pump provided in the embodiments of the present application through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0023] As shown in Figures 1 to 10, an embodiment of the present application provides a plunger pump hydraulic end, including a valve box 110, a plunger 120, a suction gland 130, a wear-resistant sleeve 140 and a first sealing ring 150. The valve box 110 has a connected accommodating chamber 111 and a suction port 112. Part of the plunger 120 is movably disposed in the accommodating chamber 111. The plunger 120 can reciprocate relative to the accommodating chamber 111 to compress the cryogenic liquid, convert mechanical energy into pressure energy of the liquid, and increase the pressure of the discharged liquid. The suction gland 130 is detachably disposed in the suction port 112. In one embodiment, the central axis of the suction gland 130 coincides with the central axis of the plunger 120 to facilitate the installation of the plunger 120. The inner wall of the suction port 112 is provided with a positioning groove 112a, and the wear-resistant sleeve 140 is arranged in the positioning groove 112a. In one embodiment, the wear-resistant sleeve 140 can be a metal structure. In one embodiment, the outer circumference of the wear-resistant sleeve 140 can be flush with the inner wall of the suction port 112 to facilitate the installation of the suction gland 130. Alternatively, the outer circumference of the wear-resistant sleeve 140 slightly protrudes from the inner wall of the suction port 112 so that the wear-resistant sleeve 140 and the suction gland 130 have an interference fit, thereby improving the sealing between the suction gland 130 and the wear-resistant sleeve 140. The first sealing ring 150 is sleeved on the suction gland 130. The suction gland 130 is sealed with the wear-resistant sleeve 140 through the first sealing ring 150, thereby improving the sealing of the accommodating chamber 111 and further improving the working efficiency of the plunger 120.

[0024] In the embodiment of the present application, when the plunger pump hydraulic end is operating, the fracturing sand contained in the first sealing ring 150 will rub against the wear-resistant sleeve 140 without causing wear on the inner wall (i.e., the sealing surface) of the suction port 112 of the valve box 110, thereby improving the sealing performance of the valve box 110, ensuring the service life of the plunger pump hydraulic end, and further improving work efficiency at the job site. Therefore, the embodiment of the present application can solve the problem that the valve box 110 of the plunger pump hydraulic end is easily worn and thus has poor sealing performance.

[0025] In one embodiment, a groove may be provided on one of the circumferential surface of the suction gland 130 and the inner circumferential surface of the wear-resistant sleeve 140. The first sealing ring 150 is disposed in the groove to secure the first sealing ring 150 and prevent the first sealing ring 150 from moving in the axial direction of the wear-resistant sleeve 140. In one embodiment, the circumferential surface of the suction gland 130 may be provided with a groove. Since the suction gland 130 is relatively large, the groove is conveniently provided.

[0026] In one embodiment, the number of the first sealing rings 150 can be at least two, and each first sealing ring 150 is arranged in sequence along the axial direction of the wear-resistant sleeve 140. The above-mentioned grooves are arranged in a one-to-one correspondence with the first sealing rings 150, thereby further improving the sealing between the suction cover 130 and the wear-resistant sleeve 140.

[0027] In one embodiment, the wear-resistant sleeve 140 is removably disposed within the positioning groove 112a. When the wear-resistant sleeve 140 becomes worn, it can be removed and replaced, thereby extending the service life of the valve box 110. In one embodiment, the wear-resistant sleeve 140 can be made of materials such as stainless steel and carbon steel, or other metal structures, and this embodiment of the present application does not impose any specific limitations on this.

[0028] 1 and 2 , in one embodiment, the thickness of the wear-resistant sleeve 140 is uniform throughout the axial direction of the wear-resistant sleeve 140. The thickness herein specifically refers to the distance between the outer surface of the wear-resistant sleeve 140 and the inner surface of the wear-resistant sleeve 140. The wear-resistant sleeve 140 in this embodiment is a straight sleeve having a constant outer diameter in the axial direction, which facilitates processing and manufacturing.

[0029] Referring to Figures 3 and 4, in another embodiment, the thickness of the wear-resistant sleeve 140 gradually decreases as it extends toward the plunger 120. The thickness here specifically refers to the distance between the outer surface of the wear-resistant sleeve 140 and the inner surface of the wear-resistant sleeve 140. In this embodiment, the wear-resistant sleeve 140 is a tapered sleeve, the outer circumference of which forms an interference fit with the inner wall of the positioning groove 112a, thereby improving the installation stability of the wear-resistant sleeve 140. Furthermore, the thickness of the wear-resistant sleeve 140 in this embodiment gradually decreases along its installation direction. During the installation process, the tapered sleeve serves as a guide, which helps improve the installation efficiency of the wear-resistant sleeve 140.

[0030] Referring to Figures 7 and 8, in another embodiment, the hydraulic end of the plunger pump further includes a retaining ring 160. In one embodiment, the wear-resistant sleeve 140 may be a retaining spring, but other types of structures are also possible and are not specifically limited herein. The inner wall of the suction port 112 further includes a receiving groove 112b, which is connected to the positioning groove 112a. The receiving groove 112b is located at the end of the positioning groove 112a away from the plunger 120. The retaining ring 160 is detachably disposed within the receiving groove 112b, with the wear-resistant sleeve 140 abutting against the retaining ring 160. During the operation of the hydraulic end of the plunger pump, when the fracturing sand mixed in the first sealing ring 150 rubs against the wear-resistant sleeve 140, the interaction between the wear-resistant sleeve 140 and the retaining ring 160 is conducive to improving the stability of the wear-resistant sleeve 140. At this time, the wear of the wear-resistant sleeve 140 can be reduced, thereby extending the service life of the wear-resistant sleeve 140; and, in the process of replacing the wear-resistant sleeve 140, the retaining ring 160 can be removed first, and then the wear-resistant sleeve 140 can be removed. During installation, the wear-resistant sleeve 140 can be installed first, and then the retaining ring 160 can be installed. During this process, the accommodating groove 112b can provide a certain movement space for the wear-resistant sleeve 140 to facilitate the disassembly and assembly of the wear-resistant sleeve 140.

[0031] In one embodiment, in the radial direction of the wear-resistant sleeve 140, the groove depth of the accommodating groove 112b can be equal to the groove depth of the positioning groove 112a; or, in the radial direction of the wear-resistant sleeve 140, the groove depth of the accommodating groove 112b is greater than the groove depth of the positioning groove 112a. In this case, the size of the retaining ring 160 can be increased, thereby improving the structural strength of the retaining ring 160. When the wear-resistant sleeve 140 acts on the retaining ring 160, it is beneficial to improve the stability of the wear-resistant sleeve 140.

[0032] In one embodiment, the plunger pump hydraulic end described in any of the above embodiments further includes a second sealing ring 170, and a mounting groove 141 is provided on one of the bottom of the positioning groove 112a and the outer circumferential surface of the wear-resistant sleeve 140. That is, the bottom of the positioning groove 112a may be provided with the mounting groove 141, or the outer circumferential surface of the wear-resistant sleeve 140 may be provided with the mounting groove 141. The second sealing ring 170 is disposed in the mounting groove 141, and the wear-resistant sleeve 140 is sealed with the valve box 110 via the second sealing ring 170, thereby improving the sealing between the wear-resistant sleeve 140 and the valve box 110.

[0033] In one embodiment, the number of mounting grooves 141 can be at least two, and the second sealing ring 170 is arranged in a one-to-one correspondence with the mounting groove 141. The at least two mounting grooves 141 can include a first mounting groove and a second mounting groove arranged along the axial direction of the wear-resistant sleeve 140. The first mounting groove and the second mounting groove can both be opened at the bottom of the positioning groove 112a, or both can be opened at the outer peripheral surface of the wear-resistant sleeve 140. One can also be opened at the bottom of the positioning groove 112a, and the other can be opened at the outer peripheral surface of the wear-resistant sleeve 140. The embodiment of the present application does not impose any specific restrictions on this.

[0034] Referring to Figures 5 and 6, in another embodiment, the outer peripheral surface of the wear-resistant sleeve 140 is a threaded surface, and the wear-resistant sleeve 140 is threadedly engaged with the bottom of the positioning groove 112a. The bottom of the groove here specifically refers to the inner wall of the peripheral surface of the positioning groove 112a facing the suction end cover 130. In this solution, when the fracturing sand mixed with the first sealing ring 150 rubs against the wear-resistant sleeve 140, the wear-resistant sleeve 140 is threadedly engaged with the bottom of the positioning groove 112a, which can prevent the wear-resistant sleeve 140 from moving within the positioning groove 112a, thereby improving the stability of the wear-resistant sleeve 140 and further reducing the wear of the wear-resistant sleeve 140, thereby extending the service life of the wear-resistant sleeve 140. In addition, the threaded engagement of the wear-resistant sleeve 140 with the bottom of the positioning groove 112a can also prevent the leakage of high-pressure liquid in the accommodating chamber 111.

[0035] 9 and 10 , in one embodiment, the hydraulic end of the plunger pump further includes a weld 180, through which the wear-resistant sleeve 140 is welded to the inner wall of the positioning groove 112a, thereby securing the wear-resistant sleeve 140 to the valve box 110. When fracturing sand entrained in the first sealing ring 150 rubs against the wear-resistant sleeve 140, the fixed connection between the wear-resistant sleeve 140 and the positioning groove 112a prevents the wear-resistant sleeve 140 from shaking relative to the positioning groove 112a, thereby improving the stability of the wear-resistant sleeve 140 and reducing wear on the wear-resistant sleeve 140, thereby extending the service life of the wear-resistant sleeve 140.

[0036] In one embodiment, when the wear-resistant sleeve 140 is fixed to the valve box 110 , the wear-resistant sleeve 140 may be made of a high-hardness, high-strength metal material, such as tungsten carbide, etc., which is not specifically limited in this embodiment of the present application.

[0037] In one embodiment, the wear-resistant sleeve 140 may also be embedded in the positioning groove 112a to fix the wear-resistant sleeve 140 in the positioning groove 112a, thereby preventing the wear-resistant sleeve 140 from shaking relative to the positioning groove 112a, thereby improving the stability of the wear-resistant sleeve 140.

[0038] In one embodiment, the plunger pump power end further includes a suction nut 190 and a packing seal assembly 210. At least a portion of the suction nut 190 is disposed within the suction port 112. The suction nut 190 abuts against the side of the suction gland 130 facing away from the plunger 120 to secure the suction gland 130. In one embodiment, the suction nut 190 can be secured to the valve box 110 by bolts, screws, or other fasteners. A portion of the packing seal assembly 210 is disposed within the accommodating chamber 111. The plunger 120 is sealed against the inner wall of the accommodating chamber 111 via the packing seal assembly 210, thereby improving the sealing performance of the accommodating chamber 111. In one embodiment, the packing seal assembly 210 includes a packing box 211 and a packing cap 212. The packing box 211 is disposed on the inner wall of the accommodating chamber 111. The packing box 211 is located at the end of the accommodating chamber 111 away from the suction gland 130. The packing box 211 is disposed near the opening of the accommodating chamber 111. The packing cap 212 is disposed at the opening of the accommodating chamber 111. One end of the plunger 120 extends through the avoidance opening of the packing cap 212 to the outside of the accommodating chamber 111. In one embodiment, the packing cap 212 can be fixed to the valve box 110 by bolts, screws, or other fixing members.

[0039] In one embodiment, the hydraulic end of the plunger pump also includes an upper valve seat 220, an upper valve body 230, a lower valve seat 240, and a lower valve body 250. The upper valve seat 220, the upper valve body 230, the lower valve seat 240, and the lower valve body 250 are all arranged in the accommodating chamber 111. The upper valve seat 220 and the upper valve body 230 are both located on one side of the plunger 120. The upper valve body 230 is arranged on the upper valve seat 220. The lower valve seat 240 and the lower valve body 250 are both located on the other side of the plunger 120. The lower valve body 250 is arranged on the lower valve seat 240. In one embodiment, the above-mentioned upper valve body 230 can be an outlet valve body, which can only discharge liquid but prevent liquid from being inhaled; the above-mentioned lower valve body 250 can be an inlet valve body, which can only inhale liquid but prevent liquid from being discharged.

[0040] In one embodiment, the valve housing 110 further comprises a discharge port 113, which is located on the top surface of the accommodating chamber 111. The hydraulic end of the plunger pump further comprises a discharge gland 260, a discharge cap 270, a third sealing ring 280, and an elastic bracket 290. The discharge gland 260 and the discharge cap 270 are both disposed within the discharge port 113. The discharge cap 270 is located above the discharge gland 260 and abuts against the discharge cap 270. In one embodiment, the discharge cap 270 can be secured to the valve housing 110 by bolts, screws, or other fasteners. The third sealing ring 280 is sleeved on the discharge gland 260, and the discharge gland 260 is sealed with the valve housing 110 via the third sealing ring 280. The elastic bracket 290 is disposed within the accommodating chamber 111, and a portion of the plunger 120 is supported on the elastic bracket 290.

[0041] In one embodiment, the first sealing ring 150, the second sealing ring 170, and the third sealing ring 280 can all be O-rings, which are compact and easy to assemble and disassemble. They can be used for both static and dynamic sealing, with virtually no leakage when used as static seals and low friction resistance when used as dynamic seals. Furthermore, O-rings provide bidirectional sealing. Of course, the first sealing ring 150, the second sealing ring 170, and the third sealing ring 280 can also be other types of sealing rings, and this embodiment of the application does not impose any specific limitations on this.

[0042] Based on the plunger pump hydraulic end disclosed in the embodiment of the present application, the embodiment of the present application also discloses a plunger pump, including a plunger pump power end and the plunger pump hydraulic end described in any of the above embodiments, and the crank-connecting rod mechanism of the plunger pump power end is connected to the plunger of the plunger pump hydraulic end.

[0043] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A hydraulic end of a piston pump, wherein, It includes a valve box (110), a plunger (120), a suction gland (130), a wear-resistant sleeve (140) and a first sealing ring (150). The valve box (110) has a containing cavity (111) and a suction port (112) that are connected and communicate with each other. A part of the plunger (120) is movably arranged in the containing cavity (111). The suction gland (130) is detachably arranged in the suction port (112). A positioning groove (112a) is provided on the inner wall of the suction port (112). The wear-resistant sleeve (140) is arranged in the positioning groove (112a). The first sealing ring (150) is sleeved on the suction gland (130). The suction gland (130) is in sealing cooperation with the wear-resistant sleeve (140) through the first sealing ring (150).

2. The hydraulic end of the plunger pump according to claim 1, wherein, The wear-resistant sleeve (140) is detachably arranged in the positioning groove (112a).

3. The hydraulic end of the plunger pump according to claim 2, wherein, In the axial direction of the wear-resistant sleeve (140), the thickness of the wear-resistant sleeve (140) is the same everywhere.

4. The hydraulic end of the plunger pump according to claim 2, wherein, In the extending direction of the wear-resistant sleeve (140) towards the plunger (120), the thickness of the wear-resistant sleeve (140) gradually decreases. The outer peripheral surface of the wear-resistant sleeve (140) is in interference fit with the inner wall of the positioning groove (112a).

5. The hydraulic end of the piston pump according to claim 2, wherein, The hydraulic end of the plunger pump further includes a snap ring (160). A receiving groove (112b) is further provided on the inner wall of the suction port (112). The receiving groove (112b) communicates with the positioning groove (112a). The receiving groove (112b) is located at one end of the positioning groove (112a) away from the plunger (120). The snap ring (160) is detachably arranged in the receiving groove (112b). The wear-resistant sleeve (140) abuts against the snap ring (160).

6. The hydraulic end of the plunger pump according to claim 5, wherein, In the radial direction of the wear-resistant sleeve (140), the depth of the receiving groove (112b) is greater than the depth of the positioning groove (112a).

7. The hydraulic end of the plunger pump according to any one of claims 3 to 6, wherein, The hydraulic end of the plunger pump further includes a second sealing ring (170). An installation groove (141) is provided on one of the bottom of the positioning groove (112a) and the outer peripheral surface of the wear-resistant sleeve (140). The second sealing ring (170) is arranged in the installation groove (141). The wear-resistant sleeve (140) is in sealing cooperation with the valve box (110) through the second sealing ring (170).

8. The hydraulic end of the plunger pump according to claim 2, wherein, The outer peripheral surface of the wear-resistant sleeve (140) is a threaded surface. The wear-resistant sleeve (140) is in threaded cooperation with the bottom of the positioning groove (112a).

9. The hydraulic end of the plunger pump according to claim 1, wherein, The hydraulic end of the plunger pump further includes a welding part (180). The wear-resistant sleeve (140) is welded to the inner wall of the positioning groove (112a) through the welding part (180).

10. A plunger pump, wherein, It includes a power end of a plunger pump and the hydraulic end of the plunger pump according to any one of claims 1 to 9. The crank-link mechanism of the power end of the plunger pump is connected to the plunger of the hydraulic end of the plunger pump.

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