Fluid end

Abstract

The utility model discloses a fluid end, and relates to the field of oil and gas equipment. A fluid end comprises a fluid end body, a plunger and a packing assembly. The fluid end body is provided with a plunger cavity, and the plunger is movably arranged in the plunger cavity. The packing assembly comprises a packing body, a first pressing piece and a second pressing piece. The packing body is arranged between the outer wall of the plunger and the inner wall of the plunger cavity. The first pressing piece is detachably connected with the fluid end body and arranged on the outer side of the plunger in a sleeving mode. The plunger is sleeved with the second pressing piece, the second pressing piece is detachably connected with the first pressing piece, at least part of the second pressing piece is arranged between the outer wall of the plunger and the first pressing piece, and the second pressing piece abuts against the packing body. The problem that the valve box is prone to being scrapped can be solved.

Description

Technical Field

[0001] The present application belongs to the technical field of oil and gas equipment, and specifically relates to a hydraulic end. Background Art

[0002] Some valve boxes of hydraulic ends in the related art adopt an integral structure, in which the packing is pressed between the plunger and the valve box by a packing nut, and the packing nut is threadedly connected to the end of the valve box.

[0003] However, in the above-mentioned manner, the threads of the valve box are subjected to alternating loads, and the threads are prone to cracking, which may cause the valve box to be scrapped. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a hydraulic end that can solve the problem of the valve box being easily scrapped.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] The embodiment of the present application provides a fluid end, which includes: a fluid end body, a plunger and a packing assembly;

[0007] The hydraulic end body is provided with a plunger cavity, and the plunger is movably arranged in the plunger cavity;

[0008] The packing assembly comprises a packing body, a first pressing member and a second pressing member, wherein the packing body is arranged between the outer wall of the plunger and the inner wall of the plunger cavity;

[0009] The first pressing member is detachably connected to the hydraulic end body and sleeved on the outer side of the plunger;

[0010] The second pressing member is sleeved on the outer side of the plunger and is detachably connected to the first pressing member, and at least a portion of the second pressing member is disposed between the outer wall of the plunger and the first pressing member and abuts against the disk base body.

[0011] Compared to the method of directly connecting the packing pressure cap to the hydraulic end body, in the embodiment of the present application, the second clamping piece used to limit the packing body is not directly connected to the hydraulic end body, but is indirectly connected to the hydraulic end body through the first clamping piece. In this way, during the maintenance of the packing body, there is no need to disassemble the first clamping piece, but only need to remove the second clamping piece from the first clamping piece. Even if the assembly area is damaged after multiple disassembly and assembly, the hydraulic end body will not be damaged. Only the first clamping piece needs to be replaced alone, and the hydraulic end body is not involved. Therefore, the service life of the hydraulic end body is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1It is a cross-sectional schematic diagram of the first type (split type) of hydraulic end disclosed in the embodiment of the present application;

[0013] Figure 2 It is a cross-sectional schematic diagram of the second form (integrated) of the hydraulic end disclosed in the embodiment of the present application;

[0014] Figure 3 It is a first partial schematic diagram of a packing assembly disclosed in an embodiment of the present application;

[0015] Figure 4 A second partial schematic diagram of a packing assembly disclosed in an embodiment of the present application;

[0016] Figure 5 A schematic diagram of the structure of the first pressing member disclosed in an embodiment of the present application;

[0017] Figure 6 A third partial schematic diagram of a packing assembly disclosed in an embodiment of the present application;

[0018] Figure 7 A fourth partial schematic diagram of a packing assembly disclosed in an embodiment of the present application;

[0019] Figure 8 A fifth partial schematic diagram of a packing assembly disclosed in an embodiment of the present application;

[0020] Fig. 9 It is a partial schematic diagram of the first valve assembly and the end cover assembly disclosed in the embodiment of the present application;

[0021] Fig.10 This is a first structural schematic diagram of the valve bracket disclosed in the embodiment of the present application;

[0022] Fig.11 A second structural schematic diagram of the valve bracket disclosed in the embodiment of the present application;

[0023] Fig.12 A top view of the Valve bracket disclosed in the embodiment of the present application;

[0024] Fig.13 A cross-sectional schematic diagram of a valve bracket disclosed in an embodiment of the present application;

[0025] Fig.14 This is a schematic structural diagram of a valve bracket with a through hole disclosed in an embodiment of the present application;

[0026] Fig.15 This is a schematic diagram of the structure of the end cover body disclosed in the embodiment of the present application;

[0027] Fig.16 This is a schematic structural diagram of an end cover body with a protrusion disclosed in an embodiment of the present application;

[0028] Fig.17 It is a partial schematic diagram of the end cover assembly disclosed in the embodiment of the present application;

[0029] Fig.18 This is a schematic diagram of the structure of the valve box, end cover and valve bracket disclosed in the embodiment of the present application;

[0030] Fig.19 It is a partial schematic diagram of the valve box, the first valve assembly and the end cover assembly disclosed in the embodiment of the present application;

[0031] Fig. 20 A top view of the valve bracket, the end cover body and the end cover pressure cap disclosed in the embodiment of the present application;

[0032] Fig.21 It is a cross-sectional schematic diagram of the hydraulic end of the plunger in the state of squeezing fluid disclosed in the embodiment of the present application;

[0033] Fig. 22 It is a partial schematic diagram of the first valve assembly disclosed in the embodiment of the present application being arranged in the first valve cavity;

[0034] Fig.23 This is a schematic diagram of the structure of the fracturing pump disclosed in the embodiment of the present application.

[0035] Description of reference numerals:

[0036] 01-Hydraulic end;

[0037] 1-hydraulic end body; 11-valve box; 111-intersecting cavity; 112-first valve cavity; 1121-spherical surface; 113-end cover opening; 114-plunger cavity; 1141-accommodating groove; 115-first positioning hole; 116-positioning groove; 12-back plate; 13-positioning piece; 14-lubricating channel;

[0038] 2-packing assembly; 21-packing body; 22-first pressing member; 221-second fixing hole; 222-second positioning hole; 223-first mounting hole; 224-positioning protrusion; 23-second pressing member; 231-second mounting hole; 24-first oil ring; 241-first lip; 25-second oil ring; 251-second lip;

[0039] 3- First Valve Component;

[0040] 31-Valve support;

[0041] 311-frame; 3111-first end surface; 3112-second end surface; 3113-groove; 3114-boss; 3115-through hole;

[0042] 312-leg portion; 3121-first leg; 31211-fourth contact surface; 31212-arc groove; 3122-second leg; 31221-arc surface;

[0043] 313-protection part; 3131-first protection section; 31311-first contact surface; 31312-second contact surface; 3132-second protection section; 31321-third contact surface;

[0044] 32-valve sleeve; 33-valve piece; 34-elastic piece;

[0045] 4- Second Vaner component;

[0046] 5-end cover assembly;

[0047] 51-end cover body; 511-annular groove; 512-concave arc surface; 513-conical inclined surface; 514-protrusion; 515-threaded hole; 52-end cover pressure cap;

[0048] 6- plunger; 61- convex arc surface;

[0049] 7-Upper cover assembly;

[0050] 02-Power end;

[0051] 03-Speed ​​reduction device. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0053] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0054] The embodiments of the present application are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0055] refer to Figures 1 to 23 The embodiment of the present application discloses a valve support 31, which is applied to the hydraulic end 01 of a fracturing pump. In addition, the valve support 31 can also be applied to other high-pressure liquid erosion equipment, and the present application does not specifically limit the use scenario of the valve support 31.

[0056] refer to Figures 10 to 14 The disclosed valve bracket 31 includes a frame body 311, a leg portion 312 and a protective portion 313.

[0057] The frame 311 is a basic part, which can bear and fix the leg part 312 and the protection part 313. In some embodiments, the frame 311 includes a first end surface 3111 and a second end surface 3112, and the first end surface 3111 and the second end surface 3112 are along the axis of the valve support 31 (that is, Fig.10 It should be noted that, considering that the valve support 31 can be installed in the first valve cavity 112 of the valve box 11, the axis of the valve support 31 can be parallel to the axis of the first valve cavity 112, and of course, they can also be colinear.

[0058] For example, in the actual case where the valve support 31 is installed in the first valve cavity 112, the axis of the valve support 31 can extend in the vertical direction. Of course, in other working conditions, the axis of the valve support 31 can also extend in other directions. In this case, the first end surface 3111 can be the upper end surface of the frame body 311, and the second end surface 3112 can be the lower end surface of the valve body.

[0059] The protective part 313 is used to protect the connection area between the first valve cavity 112 and the intersecting cavity 111 where cavitation is prone to occur. It can shield the connection area and separate the high-pressure liquid in the intersecting cavity 111 from the connection area, thereby effectively alleviating the problem of erosion of the connection area by the high-pressure liquid, which is beneficial to reduce the probability of cavitation.

[0060] In the embodiment of the present application, the protection part 313 is provided on the first end surface 3111 and is located at the edge area of ​​the frame body 311, and the protection part 313 extends from the first end surface 3111 along the axis of the valve support 31 and in a direction away from the axis. Based on this, the extension direction of the protection part 313 is not in the same straight line as the frame body 311, but forms a certain angle, so as to meet the requirements of the frame body 311 being installed in the first valve cavity 112 and the protection part 313 shielding the connection area.

[0061] It should be noted here that the first vane cavity 112 is arranged on one side of the intersecting cavity 111, such as the bottom side, so that the extension direction of the first vane cavity 112 and the extension direction of the connecting area are not on the same straight line. Therefore, in order to simultaneously meet the installation requirements of the frame 311 and the shielding requirements of the protective part 313, the embodiment of the present application, when designing the vane bracket 31, has adaptively designed the positional relationship between the protective part 313 and the frame 311 to simultaneously meet the installation and shielding requirements.

[0062] Exemplarily, the angle between the extension direction of the protective portion 313 and the first end face 3111 can range from 90° to 160°, including, for example, 90°, 120°, 135°, 150°, 160°, etc. Of course, it can also be other degrees, which can be determined according to the design of the valve box 11 and is not specifically limited here.

[0063] Optionally, the protection part 313 and the frame 311 can be fixedly connected, such as by welding, bonding, riveting, etc. Of course, it can also be an integrated structure, that is, the protection part 313 and the frame 311 are integrally manufactured and formed, such as by casting, forging, machining, etc.

[0064] In the embodiment of the present application, the leg portion 312 is provided on the second end surface 3112 and is located at the edge area of ​​the frame body 311, and the leg portion 312 extends from the second end surface 3112 along the axis direction of the valve support 31 and in a direction away from the axis. Based on this, the extension direction of the leg portion 312 is not in the same straight line as the frame body 311, but at a certain angle, so as to meet the installation requirements of the valve support 31 as a whole in the first valve cavity 112.

[0065] It should be noted here that, by means of the inclined extension of the leg portion 312 , it can abut against the inner wall of the first valve cavity 112 , thereby achieving the installation of the valve bracket 31 and improving the installation stability of the valve bracket 31 .

[0066] In addition, the leg portion 312 is provided on the second end surface 3112 and extends obliquely from the second end surface 3112, and the protective portion 313 is provided on the first end surface 3111 and extends obliquely from the first end surface 3111, so that the leg portion 312 and the protective portion 313 are respectively located on both sides of the frame body 311 along the axial direction, which can improve the installation balance of the valve bracket 31 to a certain extent.

[0067] Exemplarily, the angle between the extension direction of the leg portion 312 and the second end face 3112 can range from 90° to 160°, including, for example, 90°, 120°, 135°, 150°, 160°, etc. Of course, it can also be other degrees, which can be determined according to the design of the valve box 11 and is not specifically limited here.

[0068] Optionally, the leg portion 312 and the frame body 311 may be fixedly connected, such as by welding, bonding, riveting, etc. Of course, they may also be an integral structure, that is, the leg portion 312 and the frame body 311 are integrally manufactured and formed, such as by casting, forging, machining, etc.

[0069] In some more specific embodiments, the frame body 311, the protective portion 313 and the leg portion 312 are an integrated structure, which can improve the overall strength of the valve support 31 to a certain extent.

[0070] In order to alleviate the stress concentration problem, a first fillet may be formed between the protection portion 313 and the first end surface 3111 . The setting of the first fillet may reduce the stress between the protection portion 313 and the frame 311 , thereby alleviating the stress concentration problem.

[0071] Similarly, a second fillet may be formed between the leg portion 312 and the second end surface 3112 . The second fillet may reduce the stress between the leg portion 312 and the frame body 311 , thereby alleviating the stress concentration problem.

[0072] In the embodiment of the present application, the leg portion 312 can be used to be installed to the first valve cavity 112 of the valve box 11 in the hydraulic end 01 to ensure the installation stability of the valve bracket 31; the protective portion 313 can be used to shield the connection area between the first valve cavity 112 of the valve box 11 and the intersecting cavity 111, thereby effectively alleviating the problem of cavitation caused by the impact of the high-pressure liquid in the intersecting cavity 111 on the connection area. Therefore, the embodiment of the present application improves the protective effect of the valve box 11 by redesigning the valve bracket 31, which is conducive to extending the service life of the valve box 11 and even the entire hydraulic end 01.

[0073] refer to Fig.12 In some embodiments, in the first direction, the width of the protection part 313 is greater than the width of the frame 311, wherein the first direction is parallel to the first end surface 3111 and perpendicular to the extension direction of the protection part 313. Based on this configuration, the protection part 313 can form a structure similar to a "wide ear", which can increase the shielding area of ​​the connection area by the protection part 313 to a certain extent, thereby preventing the high-pressure liquid from contacting a larger area of ​​the connection area, which is conducive to alleviating the cavitation problem of a larger area in the connection area.

[0074] For example, the width of a part or all of the protecting portion 313 in the first direction may be greater than the width of the frame 311 in the first direction, which may be selected according to actual working conditions.

[0075] In some preferred embodiments, along the extension direction of the protection portion 313 (ie, Fig.12The width of the protective portion 313 in the first direction gradually increases (from left to right in the figure), that is, the protective portion 313 gradually widens from the frame 311 to the direction away from the frame 311, so that the area away from the frame 311 can have a larger shielding area, which is beneficial to improve the protection effect to a certain extent.

[0076] It should be noted that, when the plunger 6 squeezes the liquid in the intersecting cavity 111, the high-pressure liquid formed by the squeezing is mainly concentrated in the end cap assembly 5 area on one side of the valve body, so that the liquid pressure in the area close to the end cap assembly 5 is relatively high. The end of the protective portion 313 away from the frame 311 is close to the end cap assembly 5 area, so that by widening the area of ​​the protective portion 313 away from the frame 311, it is beneficial to increase the blocking effect on the high-pressure liquid, thereby improving the protection effect on the connection area.

[0077] Optionally, the angle between two edges of the protection portion 313 disposed opposite to each other in the first direction (ie, Fig.12 The β) in the figure can range from 0° to 90°, including, for example, 0°, 30°, 45°, 60°, 75°, 90°, etc. Of course, it can also be other degrees, which is not specifically limited here.

[0078] When the angle between the two edges is 0°, the projection of the protective part 313 in the plane perpendicular to the axis of the valve support 31 can be a rectangle; when the angle between the two edges is greater than 0°, the projection of the protective part 313 in the plane perpendicular to the axis of the valve support 31 can be a trapezoid, such as an isosceles trapezoid, and the upper base of the trapezoid is connected to the frame body 311, and the lower base of the trapezoid is away from the frame body 311.

[0079] refer to Fig.10 and Fig.11 In some embodiments, the protection part 313 may include a first protection segment 3131 and a second protection segment 3132, wherein the second protection segment 3132 is connected between the first protection segment 3131 and the frame 311, and the first protection segment 3131 and the second protection segment 3132 extend in different directions, so that a certain angle can be formed between the two. Based on this design, the protection part 313 can adapt to the shape of the connection area between the intersecting cavity 111 and the first valve cavity 112 to improve the protection effect of the connection area.

[0080] It should be noted here that the first valve cavity 112 extends along the axial direction of the valve support 31, and one side of the intersecting cavity 111 extends along the axial direction perpendicular to the valve support 31, thereby forming a part extending along the axis and a part extending perpendicular to the axis at the connection area. Therefore, when designing the protective part 313, it is necessary to shield the entire area of ​​the connection area to provide comprehensive protection. In addition, the first protective segment 3131 and the second protective segment 3132 together form the above-mentioned "wide ear" structure to provide good protection.

[0081] Further, the extension direction of the first protection segment 3131 can be parallel to the first end face 3111, and the angle between the extension direction of the second protection segment 3132 and the extension direction of the axis can range from 100° to 135°, including, for example, 100°, 110°, 120°, 130°, 135°, etc. Of course, it can also be other degrees, which are not specifically limited here. With this design, the second protection segment 3132 can shield the portion of the connection area close to the first valve cavity 112, and the first protection segment 3131 can shield the portion of the connection area close to the intersecting cavity 111, thereby achieving comprehensive protection of the connection area to improve the protection effect.

[0082] It should be noted here that, in order to further improve the protection effect, the protection part 313 can be sealed and connected to the end cover assembly 5 to prevent the high-pressure liquid from leaking from the gap between the protection part 313 and the end cover assembly 5 and causing cavitation in the connection area.

[0083] Based on the above situation, the shape of the first protection segment 3131 needs to be adapted to the end cover assembly 5, so that the extension direction of the first protection segment 3131 is parallel to the first end face 3111, so as to form a good fit with the end cover assembly 5, thereby ensuring a sealed connection between the first protection segment 3131 and the end cover assembly 5. The specific connection method between the first protection segment 3131 and the end cover assembly 5 will be described in detail in the following content.

[0084] Continue to refer Fig.10 and Fig.11 In some embodiments, the first protection segment 3131 may include a first contact surface 31311 and a second contact surface 31312 that are disposed opposite to each other along the axial direction, wherein the first contact surface 31311 is used for sealing connection with the end cover assembly 5, and the second contact surface 31312 is used for good contact with the connection area. Based on this, the first protection segment 3131 can ensure good protection of the connection area, effectively preventing the high-pressure liquid from causing cavitation to the connection area.

[0085] Furthermore, the first contact surface 31311 can be a concave arc surface, which can cooperate well with the end cover assembly 5, thereby increasing the cooperation area and improving the sealing effect; the second contact surface 31312 can be a convex arc surface, which can contact well with the connection area through the convex arc surface, thereby increasing the contact area and improving the sealing effect.

[0086] For example, the first contact surface 31311 and the second contact surface 31312 can both be arc surfaces, and the first contact surface 31311 and the second contact surface 31312 are coaxially arranged. In this case, the first protection section 3131 can be regarded as a part of the cylinder. Of course, in other embodiments, the first contact surface 31311 and the second contact surface 31312 can also be arc surfaces with different axes.

[0087] In some embodiments, the second protection section 3132 may include a third contact surface 31321 facing away from the frame body 311, and the third contact surface 31321 may be an outer convex arc surface, which forms a good contact with the connection area through the outer convex arc surface, which is conducive to increasing the contact area and improving the sealing effect. Exemplarily, the third contact surface 31321 may be a circular arc surface to adapt to the concave shape of the connection area.

[0088] In addition, there is a gap between at least part of the protection portion 313 and the inner wall of the first valve cavity 112, and this design can effectively alleviate the problem of assembly interference. Specifically, there is a gap between the third contact surface 31321 of the second protection segment 3132 and the inner wall of the first valve cavity 112 to ensure good contact between the second contact surface 31312 and the inner wall of the intersecting cavity 111 and the first contact surface 31311 and the end cover assembly 5.

[0089] In some embodiments, a fourth contact surface 31211 may be provided on the side of the leg portion 312 facing away from the bracket, and the fourth contact surface 31211 may be an outer convex arc surface. The outer convex arc surface can form a good contact with the inner wall of the first valve cavity 112, which is conducive to improving the installation stability of the valve bracket 31. Exemplarily, the fourth contact surface 31211 may be an arc surface so as to adapt to the shape of the inner wall of the first valve cavity 112.

[0090] In some embodiments, at least a portion of the first valve cavity 112 is a spherical surface 1121 or a spherical-like surface. Correspondingly, the fourth contact surface 31211 of the leg portion 312 can also be a spherical surface or a spherical-like surface to adapt to the shape of the inner wall of the first valve cavity 112, and can increase the contact area and improve the installation stability of the valve bracket 31.

[0091] In the embodiment of the present application, the side of the leg portion 312 facing away from the frame body 311 may be provided with an arc groove 31212 extending along the circumference of the frame body 311, and the arc groove 31212 is located in the connection area between the leg portion 312 and the protection portion 313. Through the provision of the arc groove 31212, a certain avoidance space can be formed between the protection portion 313 and the root of the leg portion 312 to prevent the protection portion 313 from interfering with the root and connection area of ​​the leg portion 312, thereby ensuring the stable installation of the valve bracket 31.

[0092] refer to Figures 10 to 14 In some embodiments, the leg portion 312 may include a first leg 3121 and a second leg 3122, and the first leg 3121 and the second leg 3122 are respectively located at the edge area of ​​the frame 311. In this way, the first leg 3121 and the second leg 3122 can respectively abut against the inner wall of the first valve cavity 112, thereby increasing the abutment area and improving the installation stability of the valve bracket 31.

[0093] Furthermore, the first leg 3121 and the second leg 3122 can be centrally symmetrically arranged relative to the axis of the valve bracket 31. This design can ensure that the force acting on the valve bracket 31 is relatively balanced, which is conducive to improving the installation stability of the valve bracket 31.

[0094] In addition, the first leg 3121 is arranged corresponding to the protective part 313, that is, the first leg 3121 and the protective part 313 are both located at one side edge of the frame body 311, and the second leg 3122 is located at the other side edge of the frame body 311. Based on this, when the protective part 313 is subjected to the action of high-pressure liquid, the arrangement of the first leg 3121 and the second leg 3122 can make the valve bracket 31 more stable to prevent the valve bracket 31 from tilting or rotating.

[0095] Of course, the extension lengths of the first leg 3121 and the second leg 3122 can be the same or different, and can be set specifically according to actual working conditions. Considering that the first leg 3121 and the protective portion 313 are located on the same side edge of the frame body 311, and the protective portion 313 is subjected to a large load of high-pressure liquid, the valve support 31 has a tendency to rotate clockwise, and thus, the force exerted on the protective portion 313 and the second leg 3122 is relatively large, that is, the force exerted on the second leg 3122 is greater than the force exerted on the first leg 3121, and thus, the extension length of the second leg 3122 can be made greater than the extension length of the first leg 3121, thereby increasing the contact area between the second leg 3122 and the inner wall of the first valve cavity 112, which is conducive to increasing the bearing capacity of the second leg 3122.

[0096] In other embodiments, the leg portion 312 may further include more legs to further increase the contact area between the leg portion 312 and the inner wall of the first valve cavity 112, thereby improving the installation stability of the valve bracket 31.

[0097] In other embodiments, the leg portion 312 may also be an annular structure, which is arranged around the edge of the second end surface 3112. This arrangement can form a circle of contact portions between the leg portion 312 and the inner wall of the first valve cavity 112, thereby improving the installation stability of the valve bracket 31. In this case, the opening of the first valve cavity 112 away from the intersecting cavity 111 can be enlarged to facilitate the disassembly and assembly of the valve bracket 31.

[0098] When the leg portion 312 includes a first leg 3121 , a second leg 3122 , or even other legs, an arc-shaped groove 31212 may be provided between the first leg 3121 and the second leg 3122 to facilitate installation avoidance and prevent installation interference.

[0099] To facilitate assembly and disassembly of the valve bracket 31, the frame 311, the first leg 3121, the second leg 3122 and the protective portion 313 can all be strip structures to reduce the space occupied by the valve bracket 31 in the first valve cavity 112, thereby facilitating assembly and disassembly.

[0100] In some embodiments, a side of the second leg 3122 facing away from the frame body 311 may be provided with an arcuate surface 31221. The arcuate surface 31221 can avoid interference between the valve support 31 and the valve box 11 when the valve support 31 is installed at an angle, which is conducive to the smooth disassembly and assembly of the valve support 31. Of course, the arcuate surface 31221 can also be replaced by a conical surface, etc., as long as it can play a role in avoiding position, and the specific shape is not limited.

[0101] It should be noted that the arc surface 31221 here is adapted to the arc groove 31212 and is located on both sides of the frame 311 respectively, and both play a role of avoiding position.

[0102] In addition, since the first leg 3121 and the second leg 3122 are both provided with an arc groove 31212, the first leg 3121 and the second leg 3122 each form a step structure at the edge of the fourth contact surface 31211. In this way, when the valve bracket 31 is in the installed state, the fourth contact surface 31211 of the first leg 3121 and the second leg 3122 respectively abuts against the inner wall of the first valve cavity 112, and the groove bottom of the arc groove 31212 of the first leg 3121 and the arc surface 31221 of the second leg 3122 are respectively spaced from the inner wall of the first valve cavity 112. This arrangement can ensure that the fourth contact surface 31211 of the first leg 3121 and the second leg 3122 respectively abut against the inner wall of the first valve cavity 112, and avoid the abutment between the fourth contact surface 31211 and the inner wall of the first valve cavity 112 due to assembly interference.

[0103] In order to improve the bearing capacity of the first leg 3121, along the extension direction of the first leg 3121, the width of the first leg 3121 in the first direction gradually increases. Fig.13 As shown, based on this, the contact area between the first leg 3121 and the inner wall of the first valve cavity 112 can be increased, thereby improving the bearing capacity of the first leg 3121.

[0104] Of course, along the extension direction of the first leg 3121, the width dimensions of the first leg 3121 in the first direction may also be equal, which may be selected according to actual working conditions.

[0105] Optionally, the angle between two edges of the first leg 3121 disposed opposite to each other in the first direction (ie, Fig.13 The angle θ) in the figure can range from 0° to 45°, including, for example, 0°, 10°, 20°, 30°, 40°, 45°, etc., and of course, other degrees can also be used.

[0106] In order to improve the bearing capacity of the second leg 3122, the width of the second leg 3122 in the first direction gradually increases along the extension direction of the second leg 3122. Based on this, the contact area between the second leg 3122 and the inner wall of the first valve cavity 112 can be increased, thereby improving the bearing capacity of the second leg 3122.

[0107] Of course, along the extension direction of the second leg 3122, the width dimensions of the second leg 3122 in the first direction may also be equal, which may be selected according to actual working conditions.

[0108] Optionally, the angle between two edges of the second leg 3122 disposed opposite to each other in the first direction can range from 0° to 45°, including, for example, 0°, 10°, 20°, 30°, 40°, 45°, etc., and of course, other degrees can also be used.

[0109] refer to Figures 10 to 14 In some embodiments, the outer edge surface of the frame body 311 may be provided with a plurality of grooves 3113, each groove 3113 passing through the first end surface 3111 and the second end surface 3112. Based on this, the blocking effect on the fluid can be reduced, making the fluid flow smoother.

[0110] Exemplarily, the groove 3113 may be a circular groove, a rectangular groove, etc. In addition, a chamfer may be designed to reduce resistance to the fluid.

[0111] In addition, the projection of the area of ​​the outer edge surface of the frame body 311 between two adjacent grooves 3113 in a plane perpendicular to the axis can be a straight line or an arc.

[0112] In some embodiments, the frame body 311 may also be provided with a boss 3114, which extends from the second end surface 3112 in a direction away from the first end surface 3111. The boss 3114 can limit and guide the elastic member 34 to prevent the elastic member 34 from moving or twisting at will, and ensure that the elastic member 34 is elastically deformed along the axial direction of the valve support 31.

[0113] Exemplarily, the boss 3114 may be a cylindrical boss, a conical boss, a prismatic boss, or the like.

[0114] In addition, if Fig.14 As shown, the frame 311 may be provided with a through hole 3115, which passes through the frame 311 and the boss 3114 along the axial direction of the valve support 31. The provision of the through hole 3115 can help reduce the weight of the valve support 31, and allow a small portion of the fluid to flow through the through hole 3115, further reducing the resistance to the fluid.

[0115] In summary, the embodiment of the present application provides a new design between the valves, which has the following advantages:

[0116] 1. The "wide ear"-shaped protection portion 313 can ensure that the portion of the connection area that is prone to cavitation is shielded, thereby effectively alleviating the problem of metal surface peeling and damage in the connection area caused by cavitation caused by "vacuuming" due to insufficient upper liquid.

[0117] 2. Easy to disassemble and assemble. There is no need to disassemble other structures of the hydraulic end 01 (such as the upper cover assembly 7, etc.). Only the end cover assembly 5 needs to be disassembled to realize the disassembly and assembly of the valve support 31.

[0118] 3. The leg portion 312 conforms to the inner wall of the first valve cavity 112 and can increase the contact area with the inner wall of the first valve cavity 112, thereby improving the stability of the valve support 31 and alleviating the stress concentration problem.

[0119] 4. It can reduce the resistance to the fluid.

[0120] Based on the above-mentioned valve support 31, the embodiment of the present application also discloses a hydraulic end 01 of a fracturing pump, referring to Figures 1 to 23 The disclosed fluid end 01 comprises a fluid end body 1 and a first valve assembly 3 .

[0121] Among them, Fig.18 , Fig.19 As shown, the hydraulic end body 1 is provided with a connected intersecting cavity 111 and a first valve cavity 112, through which the liquid can flow to the intersecting cavity 111, so that the plunger 6 can squeeze the liquid in the intersecting cavity 111 to form a high-pressure liquid, which is finally discharged.

[0122] Of course, the liquid end body 1 can also be provided with a plunger cavity 114, a second valve cavity and an end cover opening 113 connected to the intersecting cavity 111, so as to respectively realize the installation of the plunger 6, the second valve assembly 4 and the end cover assembly 5, so as to meet the normal working requirements of the liquid end 01. It should be noted here that the working principle of the liquid end 01 can refer to the relevant technology and will not be elaborated here.

[0123] In the present application examples, reference Figure 1 , Figure 2 , Figures 19 to 22 , the first valve assembly 3 may include a valve sleeve 32, a valve member 33, an elastic member 34 and an elastic member bracket. The valve sleeve 32 is disposed in the first valve cavity 112, the valve member 33 is movably disposed in the valve sleeve 32, the elastic member bracket is disposed at the port of the first valve cavity 112 adjacent to the intersecting cavity 111, and the elastic member 34 is elastically connected between the valve member 33 and the elastic member bracket. Based on this, the elastic member bracket can limit the elastic member 34, so that the elastic member 34 can apply an elastic force to the valve member 33, and under the elastic force of the elastic member 34, the valve member 33 has a tendency to move toward the outside of the first valve cavity 112; under the action of the fluid, the valve member 33 moves relative to the valve sleeve 32 and compresses the elastic member 34, so that the liquid can enter the first valve cavity 112, and then enter the intersecting cavity 111 to be squeezed to form a high-pressure liquid, and finally discharged.

[0124] It is necessary to explain here that the specific working principle of the first valve component 3 can be referred to the relevant technology and will not be elaborated here.

[0125] In the embodiment of the present application, the elastic member bracket is the above-mentioned valve bracket 31, wherein the leg portion 312 is connected to the inner wall of the first valve cavity 112, and the protective portion 313 shields the connection area between the first valve cavity 112 and the intersecting cavity 111. Based on this, the stability of the valve bracket 31 in the first valve cavity 112 can be guaranteed, and the protection effect on the connection area can be achieved.

[0126] refer to Figure 1 and Figure 2 In some embodiments, the hydraulic end body 1 may also be provided with an end cap opening 113 communicating with the intersecting cavity 111, and the hydraulic end 01 further includes an end cap assembly 5, which is sealed at the end cap opening 113, and at least part of the protective portion 313 is connected to the end cap assembly 5. Through the connection between the protective portion 313 and the end cap assembly 5, the connection area between the first valve cavity 112 and the intersecting cavity 111 can be fully shielded to prevent high-pressure liquid from contacting the connection area and causing cavitation.

[0127] The end cover assembly 5 may include an end cover body 51 , at least a portion of which is disposed at the end cover opening 113 to seal the end cover opening 113 .

[0128] In order to fix the end cover body 51, the end cover assembly 5 may further include an end cover pressure cap 52, which is detachably mounted to the end cover opening 113 and is located outside the end cover body 51 to limit the end cover body 51 and prevent the end cover body 51 from being separated from the end cover opening 113 and causing leakage of the hydraulic end 01. Exemplarily, the end cover pressure cap 52 is threadedly connected to the end cover opening 113 to facilitate disassembly and maintenance.

[0129] refer to Fig.15 and Fig.16 In some embodiments, the outer edge of the end cover body 51 located in the end cover opening 113 may be provided with an annular groove 511. When the end cover body 51 is equipped with the end cover opening 113, the annular groove 511 and the inner wall of the end cover opening 113 together form a limiting space, and the end of the protective part 313 away from the frame 311 is located in the limiting space. In addition, the end of the protective part 313 away from the frame 311 may be provided with an inner concave arc surface (i.e., the first contact surface 31311), and the inner concave arc surface contacts the groove wall of the annular groove 511. Based on this configuration, the protective part 313 and the end cover body 51 can be matched through the matching of the inner concave arc surface and the groove wall of the annular groove 511, so that the high-pressure liquid can be separated from the connection area to achieve the protection of the connection area.

[0130] It should be noted here that the groove wall of the arc groove 31212 is an outer convex arc surface, which cooperates with the inner concave arc surface at one end of the protection part 313 away from the frame 311, thereby increasing the contact area and improving the sealing effect.

[0131] Of course, in other embodiments, there may be a certain gap between the inner concave arc surface and the groove wall of the annular groove 511, and the gap is greater than 0 and less than 10 mm, for example, including 1 mm, 3 mm, 5 mm, 8 mm, 10 mm, etc. Based on the existence of the gap, the disassembly and assembly of the end cover body 51 can be facilitated, and the protection part 313 can be prevented from interfering with the disassembly and assembly of the end cover body 51.

[0132] In some embodiments, the hydraulic end body 1 may also be provided with a plunger cavity 114 connected to the intersecting cavity 111, and the plunger cavity 114 and the end cover opening 113 are respectively located on both sides of the intersecting cavity 111. Accordingly, the hydraulic end 01 may also include a plunger 6, which is movably disposed in the plunger cavity 114 to pressurize the liquid in the intersecting cavity 111, thereby forming a high-pressure liquid.

[0133] Considering that the plunger 6 and the end cover body 51 are pressed in a plane, when the plunger 6 squeezes the liquid, part of the high-pressure liquid will impact the intersection line of the intersecting cavity 111. Over time, fatigue will occur at the intersection line and cracks will be generated.

[0134] Based on the above situation, a non-planar compression form is adopted between the plunger 6 and the end cover body 51. This method can help reduce the impact of high-pressure liquid on the intersection line, and help increase the stability of the plunger 6 during movement and reduce the risk of eccentricity.

[0135] Alternatively, if Fig.15 , Fig.16 and Fig.21 As shown, the end of the plunger 6 facing the intersecting cavity 111 may be provided with a convex arc surface 61, and correspondingly, the end surface of the end cover body 51 facing the intersecting cavity 111 may be provided with a concave arc surface 512, and the convex arc surface 61 is adapted to the concave arc surface 512. Based on this arrangement, the high-pressure liquid squeezed by the plunger 6 can be diverted, thereby reducing the impact of the high-speed and high-pressure liquid on the intersection line, which is conducive to extending the service life of the valve box 11.

[0136] Considering that the root of the end cover body 51 is prone to stress concentration under the action of high pressure liquid, the end cover body 51 is easily damaged. Based on this situation, in the embodiment of the present application, the outer peripheral surface of the end cover body 51 that contacts the inner wall of the end cover opening 113 can be set as a conical inclined surface 513 or an arc inclined surface, such as Figures 15 to 17As shown, in this way, the stress concentration phenomenon at the root of the end cover body 51 can be alleviated, the contact area is increased, and the surface pressure between the end cover body 51 and the inner wall of the end cover opening 113 is reduced.

[0137] like Fig.16 As shown, in some embodiments, the end surface of the end cover body 51 that is away from the end cover opening 113 may be provided with a protrusion 514, and the protrusion 514 may be provided with a threaded hole 515 along the protruding direction of the protrusion 514. Based on this, a puller with external threads can be installed in the threaded hole 515, so as to facilitate the disassembly and assembly of the end cover body 51 relative to the end cover body 51. It should be noted here that the end cover body 51 is installed to a certain depth in the end cover opening 113, and the assembly of the end cover body 51 by the puller and the end cover body 51 facilitates the disassembly and assembly of the end cover body 51.

[0138] Of course, in the case of structural limitations, the end cover body 51 may not be provided with the protrusion 514, but a threaded hole 515 may be directly provided on the end surface of the end cover body 51 away from the end cover opening 113 to facilitate the installation of the puller.

[0139] In some embodiments, at least a portion of the protection portion 313 extends into the intersecting cavity 111, and the outer edge surface of the protection portion 313 that faces away from the frame body 311 is limited by the inner wall of the intersecting cavity 111. Based on this, the protection portion 313 and even the entire valve support 31 can be limited by the inner wall of the intersecting cavity 111 to prevent the valve support 31 from rotating around the axis.

[0140] Optionally, the inner wall of the intersecting cavity 111 can be configured to be arc-shaped or U-shaped to limit the protective portion 313 and prevent the valve support 31 from rotating freely around the axis.

[0141] In some more specific embodiments, the cross-section of the intersecting cavity 111 perpendicular to the axis of the valve support 31 can be elliptical, and the inner wall of the intersecting cavity 111 of this shape can limit the valve support 31.

[0142] refer to Fig.18 and Fig.19 In some embodiments, at least part of the inner wall of the first valve cavity 112 may be a spherical surface 1121 or a quasi-spherical surface. Based on this configuration, when a high-speed fluid flows from the first valve cavity 112 to the intersecting cavity 111, the spherical surface 1121 or the quasi-spherical surface can reduce the resistance to the liquid, which is conducive to increasing the flow rate, and can also reduce the formation of local vortices and dead zones, thereby alleviating the sand settling problem.

[0143] It should be noted here that when at least part of the inner wall of the first valve cavity 112 is a spherical surface 1121, the radius of the spherical surface 1121 may be R, which is formed by rotating an arc with a radius of R around an axis.

[0144] In some embodiments, the hydraulic end body 1 may include a valve box 11 and a back plate 12 , wherein the back plate 12 is detachably connected to the valve box 11 , and the valve box 11 and the back plate 12 are made of different materials.

[0145] Based on the above arrangement, the back plate 12 can be made independent from the valve box 11, and the separation of materials can be achieved, which can achieve the purpose of saving materials and costs to a certain extent.

[0146] It should be noted that the valve box 11 needs to bear a large load and needs a high-strength material, while the back plate 12 plays a mounting role and does not bear a large load, so the back plate 12 can be made of a relatively low-strength material. In this way, the use of high-strength materials can be reduced, and the cost can be reduced.

[0147] For example, the valve box 11 may be made of a high-strength alloy material, and the back plate 12 may be made of inexpensive carbon structural steel, such as Q235, Q355, etc., and may also be made of gray iron, cast iron, stainless steel, and other materials.

[0148] In addition, the back plate 12 may also be manufactured by casting to reduce the manufacturing cost.

[0149] To prevent liquid leakage between the plunger 6 and the liquid end body 1, the liquid end 01 in the embodiment of the present application may include a liquid end body 1, a plunger 6 and a packing assembly 2, such as Figures 1 to 9 shown.

[0150] The fluid end body 1 is a basic component, which can provide an installation foundation for the plunger 6, the packing assembly 2, etc. In some embodiments, the fluid end body 1 is provided with a plunger cavity 114, and the plunger 6 is movably disposed in the plunger cavity 114. The reciprocating movement of the plunger 6 can pressurize the liquid in the fluid end body 1 to form a high-pressure liquid.

[0151] The packing assembly 2 is used to seal the gap between the plunger 6 and the plunger cavity 114 to prevent liquid leakage. Figures 3 to 8 As shown, the packing assembly 2 may include a packing body 21, a first pressing member 22 and a second pressing member 23, wherein the packing body 21 is arranged between the outer wall of the plunger 6 and the inner wall of the plunger cavity 114 to seal the gap between the outer wall of the plunger 6 and the inner wall of the plunger cavity 114, thereby preventing liquid leakage.

[0152] Exemplarily, the base body 21 may be a cylindrical structure, which is sleeved on the outside of the plunger 6 and penetrated into the plunger cavity 114. This type of base body 21 may increase the sealing area and improve the sealing effect.

[0153] The first clamping piece 22 is detachably connected to the hydraulic end body 1 and is sleeved on the outside of the plunger 6; the second clamping piece 23 is sleeved on the outside of the plunger 6 and is detachably connected to the first clamping piece 22, and at least part of the second clamping piece 23 is arranged between the outer wall of the plunger 6 and the first clamping piece 22, and abuts against the disk root body 21.

[0154] Based on the above arrangement, the second clamping member 23 is mounted to the first clamping member 22, and the first clamping member 22 is mounted to the hydraulic end body 1, thereby ensuring the installation stability of the first clamping member 22 and the second clamping member 23, and the packing body 21 can be limited by the second clamping member 23 to prevent the packing body 21 from falling off under the pressure of the high-pressure liquid; the plunger 6 can pass through the first clamping member 22 and the second clamping member 23 to ensure that the plunger 6 can move back and forth without hindrance; in addition, the first clamping member 22 is detachably connected to the hydraulic end body 1, and the second clamping member 23 is detachably connected to the first clamping member 22, which can be easily disassembled and assembled, thereby facilitating the maintenance of the packing body 21. It should be noted here that the first clamping member 22 can be regarded as a packing cap box, and the second clamping member 23 can be regarded as a packing cap.

[0155] Compared with the method of directly connecting the packing pressure cap to the hydraulic end body 1, in the embodiment of the present application, the second clamping piece 23 used to limit the packing body 21 is not directly connected to the hydraulic end body 1, but is indirectly connected to the hydraulic end body 1 through the first clamping piece 22. In this way, during the maintenance of the packing body 21, there is no need to disassemble the first clamping piece 22, but only need to remove the second clamping piece 23 from the first clamping piece 22. Even if the assembly area is damaged after multiple disassembly and assembly, the hydraulic end body 1 will not be damaged. Instead, only the first clamping piece 22 needs to be replaced alone, and the hydraulic end body 1 is not involved. Therefore, the service life of the hydraulic end body 1 is extended.

[0156] In some embodiments, the end surface of the hydraulic end body 1 may be provided with at least two first fixing holes, and the at least two first fixing holes are arranged along the circumference of the plunger cavity 114. Accordingly, the first pressing member 22 may be provided with at least two second fixing holes 221. Figure 5 As shown, at least two second fixing holes 221 are respectively arranged corresponding to at least two first fixing holes, and fasteners are provided in the corresponding first fixing holes and second fixing holes 221 .

[0157] Based on the above arrangement, the first clamping member 22 can be installed to the hydraulic end body 1 by means of fasteners, and can be easily disassembled and assembled to facilitate maintenance of the disk base body 21; and, by fastening at least two groups of correspondingly arranged first fixing holes and second fixing holes 221 together by at least two fasteners, the stability of the connection between the first clamping member 22 and the hydraulic end body 1 can be further improved.

[0158] Exemplarily, the fastener may be a structural member with external threads, such as a bolt, a screw, a stud, etc. Correspondingly, the first fixing hole may have internal threads, thereby facilitating assembly and disassembly through threaded connection.

[0159] In other embodiments, the first pressing member 22 and the hydraulic end body 1 may also be connected in other detachable manners, such as snap connection, plug connection, hook connection, etc., which are not specifically limited here.

[0160] refer to Figure 3 and Figure 5 In some embodiments, the end surface of the hydraulic end body 1 may also be provided with at least two first positioning holes 115, and the at least two first positioning holes 115 are arranged along the circumference of the plunger cavity 114; accordingly, the first clamping member 22 may also be provided with at least two second positioning holes 222, and the at least two second positioning holes 222 are respectively arranged corresponding to the at least two first positioning holes 115, and positioning members 13 are provided in the corresponding first positioning holes 115 and the second positioning holes 222.

[0161] Based on the above arrangement, the first clamping piece 22 can be positioned by the positioning piece 13 to ensure the coaxiality of the first clamping piece 22 and the plunger cavity 114 and prevent the first clamping piece 22 from being eccentric; in addition, the second clamping piece 23 is sleeved on the outside of the plunger 6 and is arranged on the first clamping piece 22. Therefore, when the first clamping piece 22 is not eccentric, the coaxiality of the second clamping piece 23, the plunger 6 and the plunger cavity 114 can be ensured, thereby reducing or avoiding eccentricity between the plunger 6 and the second clamping piece 23 and causing wear.

[0162] Exemplarily, the positioning member 13 may be a positioning pin, a positioning shaft or other structures. Of course, it may also be in other forms, which are not specifically limited here.

[0163] Optionally, the end surface of the hydraulic end body 1 may be provided with two first positioning holes 115, and the central angle between the two first positioning holes 115 may range from 90° to 180°, for example, including 90°, 120°, 135°, 150°, 180°, etc. Correspondingly, the first pressing member 22 may be provided with two second positioning holes 222, and the central angle between the second positioning holes 222 may also range from 90° to 180°, so as to be arranged correspondingly to the two first positioning holes 115.

[0164] refer to Figure 3 , Figure 4 , Figures 6 to 8 In order to realize the assembly between the first clamping member 22 and the second clamping member 23, the first clamping member 22 can be provided with a first mounting hole 223, the plunger 6 is penetrated in the first mounting hole 223, and there is an annular space between the outer wall of the plunger 6 and the inner wall of the first mounting hole 223, one end of the second clamping member 23 is arranged in the annular space, and the outer wall of the second clamping member 23 is threadedly connected to the inner wall of the first mounting hole 223.

[0165] Based on the above arrangement, the second pressing member 23 can guide and limit the plunger 6 to ensure smooth movement of the plunger 6, and can also facilitate assembly and disassembly of the second pressing member 23 and the first pressing member 22, thereby facilitating maintenance of the base body 21.

[0166] It should be noted here that before the first clamping member 22 with internal threads is separated from the hydraulic end body 1, a certain width of the undercut groove needs to be reserved when processing the internal threads. In the case of limited space, the length of the internal threads is reduced, which is not conducive to the stability of thread matching. After the first clamping member 22 with internal threads is separated from the hydraulic end body 1, there is no need to reserve the undercut groove, so that the part originally processed with the undercut groove can be set as the internal thread, so that the length of the internal thread can be increased, and the number of meshing threads within the same specification and length range is increased, so that the fatigue safety factor of the internal thread is improved, and then the service life is improved.

[0167] Of course, the second pressing member 23 may be provided with a second mounting hole 231 to facilitate the passage of the plunger 6 .

[0168] refer to Figure 4 In some embodiments, one of the end surface of the hydraulic end body 1 and the end surface of the first pressing member 22 may be provided with a positioning protrusion 224, and the other may be provided with a positioning groove 116, and the positioning protrusion 224 is matched and connected with the positioning groove 116. Based on this arrangement, the coaxiality between the first pressing member 22 and the plunger cavity 114 can be further improved, thereby improving the coaxiality of the first pressing member 22, the second pressing member 23, the plunger 6 and the plunger cavity 114 as a whole, so as to prevent eccentricity and wear.

[0169] refer to Figure 6In some embodiments, a first oil ring 24 is provided between the plunger 6 and the second pressing member 23, and the first oil ring 24 includes two first lips 241, and the two first lips 241 are arranged opposite to each other along the axial direction of the plunger 6. Based on this arrangement, the first oil ring 24 with a double-lip structure can effectively prevent external impurities such as sand from entering the interior of the hydraulic end body 1, and can also prevent the leakage of liquid, grease, etc. inside the hydraulic end body 1, thereby effectively reducing the probability of liquid leakage, grease consumption, and packing damage.

[0170] Of course, when the thickness of the first oil ring 24 is relatively large, more first lips 241 may be provided and arranged along the axial direction of the plunger 6 to enhance the blocking effect.

[0171] refer to Figure 7 In other embodiments, at least two second oil rings 25 may be provided between the plunger 6 and the second pressing member 23, each second oil ring 25 includes a second lip 251, and the second lips 251 of two adjacent second oil rings 25 are arranged opposite to each other along the axial direction of the plunger 6. Based on this arrangement, the second lips 251 of at least two second oil rings 25 can achieve a sealing effect between the plunger 6 and the second pressing member 23, so as to prevent impurities such as sand from entering the interior of the hydraulic end body 1, and also prevent the leakage of liquid, grease, etc. in the hydraulic end body 1, thereby effectively reducing the probability of liquid leakage, grease usage and packing damage.

[0172] Furthermore, a spacer ring may be provided between the plunger 6 and the second pressing member 23, and the spacer ring is provided between two adjacent second oil rings 25. Based on this, the second lips 251 of two adjacent second oil rings 25 may be separated by the spacer ring to increase the sealing area in the axial direction of the plunger 6, and to a certain extent, the sealing effect may be improved.

[0173] Of course, a spacer ring may not be provided between the plunger 6 and the second clamping member 23, but two adjacent second oil rings 25 may be spaced apart along the axial direction of the plunger 6. This method can also separate the second lip edges 251 of the two adjacent second oil rings 25 to increase the sealing area in the axial direction of the plunger 6, which can improve the sealing effect to a certain extent.

[0174] refer to Figure 3 , Figure 4 , Figures 6 to 8In some embodiments, the inner wall of the plunger cavity 114 adjacent to one end of the first pressing member 22 may be provided with a receiving groove 1141, and the base body 21 is sleeved on the outer side of the plunger 6 and disposed in the receiving groove 1141. Based on this arrangement, a setting space can be provided for the base body 21. In addition, the gap between the outer wall of the plunger 6 and the inner wall of the plunger cavity 114 can be blocked to ensure a sealing effect. Moreover, the side wall of the receiving groove 1141 and the second pressing member 23 block the base body 21 from both ends, so that the base body 21 will not move with the plunger 6, thereby ensuring the stability of the base body 21.

[0175] refer to Figure 8 In some embodiments, the bottom wall of the fluid end body 1 may be provided with a lubrication channel 14, which is in communication with the plunger cavity 114 and is arranged corresponding to the disk base body 21. Based on this arrangement, lubricating oil or grease can be added from the bottom of the fluid end body 1 to the disk base body 21, so that the bottom of the plunger cavity 114 (e.g., the receiving groove 1141) at the disk base body 21 is first filled with lubricating oil or grease, and gradually increases upwards. In this process, the air in the plunger cavity 114 at the disk base body 21 is gradually squeezed out, thereby achieving a thorough exhaust effect and preventing the presence of gas from affecting the storage of lubricating oil or grease.

[0176] In addition, the hydraulic end 01 may also include a second valve assembly 4 and an upper cover assembly 7, etc. Correspondingly, the hydraulic end body 1 may be provided with a second valve cavity, an upper cover cavity, etc. The second valve assembly 4 is provided in the second valve cavity, and the upper cover cavity is provided in the upper cover cavity.

[0177] Based on the above hydraulic end 01, the present application embodiment also discloses a fracturing pump, referring to Fig.23 The disclosed fracturing pump includes the above-mentioned hydraulic end 01. In addition, the fracturing pump may also include a power end 02 and a reduction device 03, the power end 02 is transmission-connected to the hydraulic end 01, and the reduction device 03 is transmission-connected to the power end 02, so as to reduce the motion output by the power source and transmit it to the power end 02, so as to drive the hydraulic end 01 to operate through the power end 02, realize pressurization of the liquid, form high-pressure liquid, and finally supply it to the fracturing position.

[0178] It should be noted here that the specific working principle of the fracturing pump can be referred to the relevant technology and will not be elaborated here.

[0179] 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 the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A hydraulic end, characterized in that: include: A fluid end body (1), a plunger (6) and a packing assembly (2); The hydraulic end body (1) is provided with a plunger cavity (114), and the plunger (6) is movably arranged in the plunger cavity (114); The packing assembly (2) comprises a packing body (21), a first pressing member (22) and a second pressing member (23); the packing body (21) is arranged between the outer wall of the plunger (6) and the inner wall of the plunger cavity (114); The first pressing member (22) is detachably connected to the hydraulic end body (1) and is sleeved on the outer side of the plunger (6); The second pressing member (23) is sleeved on the outer side of the plunger (6) and is detachably connected to the first pressing member (22), and at least part of the second pressing member (23) is arranged between the outer wall of the plunger (6) and the first pressing member (22) and abuts against the base body (21).

2. The hydraulic end according to claim 1, characterized in that: The end surface of the hydraulic end body (1) is provided with at least two first fixing holes, and the at least two first fixing holes are arranged along the circumference of the plunger cavity (114); The first pressing member (22) is provided with at least two second fixing holes (221), the at least two second fixing holes (221) are respectively arranged correspondingly to the at least two first fixing holes, and fasteners are arranged in the correspondingly arranged first fixing holes and second fixing holes (221).

3. The hydraulic end according to claim 1, characterized in that: The end surface of the hydraulic end body (1) is provided with at least two first positioning holes (115), and the at least two first positioning holes (115) are arranged along the circumference of the plunger cavity (114); The first pressing member (22) is provided with at least two second positioning holes (222), the at least two second positioning holes (222) are respectively arranged corresponding to the at least two first positioning holes (115), and positioning members (13) are arranged in the corresponding first positioning holes (115) and the second positioning holes (222).

4. The hydraulic end according to claim 1, characterized in that: The first pressing member (22) is provided with a first mounting hole (223), the plunger (6) is inserted into the first mounting hole (223), and an annular space is provided between the outer wall of the plunger (6) and the inner wall of the first mounting hole (223); One end of the second pressing piece (23) is arranged in the annular space, and the outer wall of the second pressing piece (23) is threadedly connected to the inner wall of the first mounting hole (223).

5. The hydraulic end according to claim 1, characterized in that: One of the end surface of the hydraulic end body (1) and the end surface of the first pressing member (22) is provided with a positioning protrusion (224), and the other is provided with a positioning groove (116); The positioning protrusion (224) is cooperatively connected with the positioning groove (116).

6. The hydraulic end according to claim 1, characterized in that: A first oil ring (24) is provided between the plunger (6) and the second pressing member (23), wherein the first oil ring (24) comprises two first lips (241), and the two first lips (241) are arranged opposite to each other in the axial direction of the plunger (6).

7. The hydraulic end according to claim 1, characterized in that: At least two second oil rings (25) are provided between the plunger (6) and the second pressing member (23), each of the second oil rings (25) comprises a second lip (251), and the second lips (251) of two adjacent second oil rings (25) are arranged opposite to each other in the axial direction of the plunger (6).

8. The hydraulic end according to claim 7, characterized in that: A spacer ring is also provided between the plunger (6) and the second pressing member (23), and the spacer ring is provided between two adjacent second oil rings (25); Alternatively, two adjacent second oil rings (25) are arranged at intervals along the axial direction of the plunger (6).

9. The hydraulic end according to claim 1, characterized in that: An inner wall of the plunger cavity (114) adjacent to one end of the first pressing member (22) is provided with an annular receiving groove (1141); The disk root body (21) is sleeved on the outside of the plunger (6) and is arranged in the receiving groove (1141).

10. The hydraulic end according to claim 1 or 9, characterized in that: The bottom wall of the hydraulic end body (1) is provided with a lubrication channel (14), the lubrication channel (14) is communicated with the plunger cavity (114), and is arranged corresponding to the disk root body (21).

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