Fluid end and pump

Abstract

The invention discloses a fluid end and a pump, and belongs to the technical field of oil gas and mine exploitation, the fluid end comprises a valve seat, a valve box, a first sealing piece and a second sealing piece, the valve seat is provided with a first annular groove and a first liquid inlet channel, the first annular groove is located in the peripheral surface of the valve seat, and the valve box is provided with a mounting cavity and a second liquid inlet channel; a second annular groove is formed in the cavity wall of the mounting cavity, the valve seat is mounted in the mounting cavity, the first liquid inlet channel communicates with the second liquid inlet channel, and a first port of the first liquid inlet channel extends to the side face of the valve seat; in the axial direction of the valve seat, the first port is located between the first annular groove and the second annular groove, the first sealing piece is installed in the first annular groove, the second sealing piece is installed in the second annular groove, and the first sealing piece and the second sealing piece are both in sealing fit with the valve seat and the valve box. The fluid end can solve the problem that the sealing relation between the valve seat and the valve box is prone to losing efficacy at present.

Description

Technical Field

[0001] This application belongs to the technical fields of oil and gas and mining, and particularly relates to a fluid end and a pump. Background Art

[0002] A pump is a commonly used device in the process of oil and gas extraction. A pump generally includes a power end and a fluid end. The power end can transmit power to the fluid end to complete the work of sucking and discharging liquid. In current pumps, the fluid end includes a valve box and a valve seat. The valve box is provided with an installation cavity, and the valve seat is installed in the installation cavity of the valve box. Axially of the valve seat, sealing rings are provided at both opposite ends of the valve seat, such that each sealing ring is axially pressed between the valve seat and the valve box to provide a sealing function for the valve seat and the valve box.

[0003] However, during the operation of the fluid end, affected by the liquid flow, axially of the valve seat, the valve seat may move slightly relative to the valve box, and moreover, the valve seat may also rotate relative to the valve box. This may cause the sealing rings between the valve seat and the valve box to fail due to the movement of the valve seat, resulting in the failure of the sealing relationship between the two, which will have a greater impact on the normal operation of the fluid end. Summary of the Invention

[0004] The purpose of the embodiments of this application is to provide a fluid end and a pump to solve the problem that the sealing relationship between the current valve seat and valve box is prone to failure.

[0005] In a first aspect, the embodiments of this application disclose a fluid end, characterized in that the fluid end includes a valve seat, a valve box, a first sealing member, and a second sealing member. The valve seat is provided with a first annular groove and a first liquid inlet channel. The first annular groove is located on the outer peripheral surface of the valve seat. The valve box is provided with an installation cavity and a second liquid inlet channel. The cavity wall of the installation cavity is provided with a second annular groove. The valve seat is installed in the installation cavity, and the first liquid inlet channel is communicated with the second liquid inlet channel. The first port of the first liquid inlet channel extends to the side surface of the valve seat; Axially of the valve seat, the first port is located between the first annular groove and the second annular groove, and the first sealing member is installed in the first annular groove, and the second sealing member is installed in the second annular groove. Both the first sealing member and the second sealing member are in sealing cooperation with the valve seat and the valve box.

[0006] In a second aspect, the embodiments of this application also disclose a pump, which includes the above-mentioned fluid end.

[0007] An embodiment of the present application discloses a hydraulic end, which includes a valve seat, a valve box, a first seal and a second seal. Among them, the valve seat cooperates with the valve box, and the first port of the first liquid inlet channel of the valve seat extends and is located on the connecting side surface, so that the first liquid inlet channel of the valve seat can communicate with the corresponding second liquid inlet channel on the valve box.

[0008] In order to ensure that while the first liquid inlet channel and the second liquid inlet channel communicate with each other, the second liquid inlet channel and the second liquid discharge channel on the valve box can be kept isolated from each other. In the hydraulic end disclosed in the embodiment of the present application, the valve seat is provided with a first annular groove, the first annular groove is located on the outer peripheral surface of the valve seat, the cavity wall of the installation cavity of the valve box is provided with a second annular groove, the first seal is installed in the first annular groove, the second seal is installed in the second annular groove, and both the first seal and the second seal are in sealing cooperation with the valve seat and the valve box. Thus, the connecting side surface of the valve seat, the first seal, the cavity wall of the installation cavity, and the second seal can enclose a space. At the same time, both the first liquid inlet channel and the second liquid inlet channel communicate with the aforementioned space. Of course, the first liquid discharge channel of the valve seat and the second liquid discharge channel of the valve box are both located outside the aforementioned space. Under the action of the sealing effect provided by the first seal and the second seal, the second liquid inlet channel of the valve box can communicate with the first liquid inlet channel of the valve seat, and it is ensured that the second liquid inlet channel of the valve box can be isolated from the second liquid discharge channel of the valve box, thereby ensuring that the liquid inlet process and the liquid discharge process can be carried out independently and separately.

[0009] At the same time, since the first annular groove is located on the outer peripheral surface of the valve seat and the second annular groove is located on the cavity wall of the installation cavity of the valve box, the second annular groove is also located on the outer peripheral side of the valve seat. Thus, during the working process of the valve seat, even if the valve seat shakes slightly relative to the valve box, the sealing cooperation relationship between the valve seat and the valve box will not be affected, so as to ensure that the sealing reliability between the valve seat and the valve box is always relatively high. In addition, compared with the technical solution in which both the first annular groove and the second annular groove are provided on the valve box or the valve seat, in the embodiment of the present application, by making the first annular groove and the second annular groove be located on the valve seat and the valve box respectively, it is also possible to prevent the structural strength of the corresponding device (i.e., the valve seat or the valve seat) from being greatly adversely affected due to the excessive groove structures provided on the valve seat and the valve seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings: Figure 1 It is a schematic cross-sectional view of the valve seat in the hydraulic end disclosed in the embodiment of the present application; Figure 2 It is a schematic cross-sectional view of the valve seat in the hydraulic end disclosed in the embodiment of the present application in another direction; Figure 3 Structural schematic diagram of the valve seat in the hydraulic end disclosed in the embodiment of the present application; Figure 4 Structural schematic diagram of the valve seat in the hydraulic end disclosed in the embodiment of the present application from another angle; Figure 5 Cross-sectional schematic diagram of the hydraulic end disclosed in the embodiment of the present application; Figure 6 For Figure 5 Partial enlarged view of the shown structure; Figure 7 Schematic diagram of the liquid inlet process of the hydraulic end disclosed in the embodiment of the present application; Figure 8 Schematic diagram of the liquid discharge process of the hydraulic end disclosed in the embodiment of the present application; Figure 9 Structural schematic diagram of the protective plate in the hydraulic end disclosed in the embodiment of the present application; Figure 10 For Figure 9 Assembly schematic diagram of the shown protective plate, liquid discharge valve assembly and valve seat; Figure 11 Another structural schematic diagram of the protective plate in the hydraulic end disclosed in the embodiment of the present application; Figure 12 For Figure 11 Assembly schematic diagram of the shown protective plate, liquid discharge valve assembly and valve seat; Figure 13 Structural schematic diagram of the lining ring in the hydraulic end disclosed in the embodiment of the present application; Figure 14 Cross-sectional schematic diagram of the lining ring in the hydraulic end disclosed in the embodiment of the present application; Figure 15 Assembly schematic diagram of the protective plate, lining ring, liquid discharge valve assembly and valve seat; Figure 16 Structural schematic diagram of the hydraulic end disclosed in the embodiment of the present application; Figure 17 Structural schematic diagram of the hydraulic end disclosed in the embodiment of the present application from another angle; Figure 18 A structural schematic diagram of the valve box in the hydraulic end disclosed in the embodiment of the present application; Figure 19 Another structural schematic diagram of the valve seat in the hydraulic end disclosed in the embodiment of the present application; Figure 20 Another structural schematic diagram of the valve seat in the hydraulic end disclosed in the embodiment of the present application; Figure 21 For Figure 19 Cross-sectional schematic diagram of the shown valve seat; Figure 22 Schematic structural diagram of the pump disclosed in the embodiments of the present application.

[0011] Reference numerals: 100 - valve box, 110 - installation cavity, 111 - first annular groove, 112 - second annular groove, 161 - second liquid discharge channel, 171 - second liquid inlet channel, 200 - valve seat, 200a - seat body, 200b - lining ring, 211 - first sealing ring surface, 211a - first axis, 212 - second sealing ring surface, 212a - second axis, 213 - first seat end face, 214 - second seat end face, 215 - connecting side face, 216 - first annular groove, 217 - second annular groove, 220 - first liquid inlet channel, 221 - first port, 230 - accommodating groove, 232 - groove side wall, 240 - first liquid discharge channel, 241 - second port, 251 - first mating concave surface, 252 - second mating concave surface, 310a - liquid inlet valve assembly, 310b - liquid discharge valve assembly, 320 - discharge flange, 331 - packing box, 332 - packing gland, 333 - packing assembly, 334 - sealing ring, 341 - discharge gland, 342 - discharge cover, 350 - clamp, 360 - tee, 400 - plunger, 510 - threaded connector, 520 - fastener, 611 - first seal, 612 - second seal, 613 - third seal, 620 - protective plate, 621 - bridging portion, 621a - through hole, 622 - shielding rib plate, 623 - circumferential connecting portion, 640 - wear-resistant ring, 710 - adapter plate, 720 - manifold, 721 - manifold cavity, 722 - liquid inlet, 730 - liquid inlet manifold, 900 - power end, X - first direction, Y - second direction, Z - third direction, HP - high-pressure chamber, LP - low-pressure chamber, AP - alternating chamber. Detailed implementation manners

[0012] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0013] As Figure 1-22 shown, the embodiments of the present application disclose a valve seat 200, a hydraulic end, and a pump. Among them, as Figure 1 shown, the embodiments of the present application disclose a valve seat 200. As Figure 5 shown, the valve seat 200 can be applied to the hydraulic end, and as Figure 22As shown in the figure, the hydraulic end can also be applied to a pump. Of course, in other solutions, the valve seat 200 can also be applied to other structures or other types of pump structures. For the convenience of description, hereinafter, the valve seat 200 applied to the hydraulic end of the pump will be taken as an example to introduce the valve seat 200.

[0014] In a pump, the hydraulic end is used to cooperate with the power end 900 and perform the pumping work of liquid. Among them, the power end 900 is used to provide driving force, which usually can include driving devices such as motors. The hydraulic end usually can include a valve box 100 and a valve seat 200. Of course, in order to ensure that the liquid inlet and discharge processes can be carried out independently, the hydraulic end can also include structures such as check valves and necessary sealing devices. The valve box 100 serves as the installation base for other structures in the hydraulic end, and the valve box 100 usually includes an installation cavity 110. At the same time, in order to ensure that the liquid can enter the hydraulic end and be discharged from within the hydraulic end, the valve box 100 is also provided with a liquid inlet channel and a liquid discharge channel. And, during the working process of the hydraulic end, the valve seat 200 can cooperate with the corresponding check valve to enable the hydraulic end to alternately perform the liquid inlet process and the liquid discharge process. For this reason, the valve seat 200 is also provided with a liquid inlet channel and a liquid discharge channel. For the convenience of understanding, the liquid inlet channel provided on the valve seat 200 is the first liquid inlet channel 220, and the liquid inlet channel provided on the valve box 100 is the second liquid inlet channel 171. Correspondingly, the liquid discharge channel provided on the valve seat 200 is the first liquid discharge channel 240, and the liquid discharge channel provided on the valve box 100 is the second liquid discharge channel 161. At the same time, the first liquid inlet channel 220 is communicated with the second liquid inlet channel 171, and the first liquid discharge channel 240 is communicated with the second liquid discharge channel 161.

[0015] More specifically, as Figure 1 shown, in the embodiment of the present application, the valve seat 200 is generally a block-shaped structural member, and the valve seat 200 has a first seat end face 213, a second seat end face 214 and a side face. In the axial direction of the valve seat 200, the first seat end face 213 and the second seat end face 214 are located at opposite ends of the valve seat 200, and the two are connected to each other through the side face. Furthermore, the side face has a connecting function and can also be called a connecting side face 215. The connecting side face 215 is the outer peripheral face of the valve seat 200. Generally speaking, the connecting side face 215 is arranged around the straight line where the axis of the valve seat 200 is located. Optionally, the connecting side face 215 is a cylindrical side face structure, that is, the radial dimension at any position in the connecting side face 215 is the same. Or, the connecting side face 215 can also be an irregular ring-shaped structure. For example, a certain position or a certain point area, or even a certain ring area in the connecting side face 215 can be recessed relative to other positions, that is, the radial dimension at this position is smaller than the radial dimension at other positions, so that the aforementioned position of the connecting side face 215 can form a cavity with the cavity wall of the installation cavity 110, and this cavity can provide a flow path for the liquid. Intuitively, Figure 16The direction X therein is the axial direction of the valve seat 200. Meanwhile, this direction X can also be denoted as the first direction.

[0016] To prevent stress concentration at the intersection position of the second liquid inlet channel 171 and the second liquid discharge channel 161 in the valve box 100 due to their mutual intersection, in the embodiment of the present application, the second liquid inlet channel 171 and the second liquid discharge channel 161 do not intersect. That is, in the embodiment of the present application, the valve box 100 does not have a cross intersection line. In this case, in order to ensure that the liquid end can still perform the liquid inlet and discharge operations normally, on the axial direction of the valve seat 200, check valves are provided at both opposite ends of the valve seat 200. The check valves are specifically valve element assemblies. Among them, the valve element assembly provided at one end of the valve seat 200 is the liquid inlet valve element assembly 310a, and the valve element assembly provided at the other end of the valve seat 200 is the liquid discharge valve element assembly 310b. Correspondingly, the second liquid inlet channel 171 of the valve box 100 is arranged at a position corresponding to or adjacent to the liquid inlet valve element assembly 310a, and the second liquid discharge channel 161 of the valve box 100 is arranged at a position corresponding to or adjacent to the liquid discharge valve element assembly 310b. As described above, since the liquid inlet valve element assembly 310a and the liquid discharge valve element assembly 310b are distributed along the axial direction of the valve seat 200, and there is still the valve seat 200 between them, further, there is a certain dimensional interval between the second liquid inlet channel 171 and the second liquid discharge channel 161 on the valve box 100 in the above axial direction. This can ensure that the second liquid inlet channel 171 and the second liquid discharge channel 161 do not intersect, so that the valve box 100 of the liquid end disclosed in the embodiment of the present application does not have a cross intersection line, which can improve the service life of the valve box 100.

[0017] As above, the valve seat 200 is provided with a first liquid inlet channel 220, the valve box 100 is provided with a second liquid inlet channel 171, and the valve box 100 is provided with an installation cavity 110. The valve seat 200 is installed within the installation cavity 110 of the valve box. Further, in order to ensure that the first liquid inlet channel 220 can communicate with the second liquid inlet channel 171, in the embodiment of the present application, the first port 221 of the first liquid inlet channel 220 is located on the connection side surface 215. That is, the first port 221 of the first liquid inlet channel 220 extends to the connection side surface 215 of the valve seat 200 to ensure that the first liquid inlet channel 220 can communicate with the second liquid inlet channel 171 provided on the outer periphery of the installation cavity of the valve box 100.

[0018] For the other end port of the first liquid inlet channel 220 of the valve seat 200, it can extend to the position where the liquid inlet valve element assembly 310a is located, so that the liquid entering the valve box 100 through the second liquid inlet channel 171 can enter the area where the liquid inlet valve element assembly 310a is located through the first liquid inlet channel 220.

[0019] Meanwhile, the first liquid discharge channel 240 of the valve seat 200 is used to communicate with the regions where the liquid inlet valve assembly 310a and the liquid discharge valve assembly 310b are located respectively. As described above, in the liquid end disclosed in the embodiment of the present application, the liquid inlet valve assembly 310a and the liquid discharge valve assembly 310b are respectively located outside the opposite ends of the valve seat 200. In this case, the first liquid discharge channel 240 can be arranged to penetrate the valve seat 200 along the axial direction of the valve seat 200, so that the side where the first seat end face 213 of the valve seat 200 is located and the side where the second seat end face 214 is located can be communicated through the first liquid discharge channel 240. More specifically, taking the axial direction of the valve seat 200 as the left-right direction, and the side where the first seat end face 213 is located as the left side of the valve seat 200, and the side where the second seat end face 214 is located as the right side of the valve seat 200 as an example, the first liquid discharge channel 240 can communicate the left side and the right side of the valve seat 200, and one of the liquid inlet valve assembly 310a and the liquid discharge valve assembly 310b is located on the left side, and the other is located on the right side, ensuring that the liquid sucked into the region where the liquid inlet valve assembly 310a is located can flow through the first liquid discharge channel 240 to the region where the liquid discharge valve assembly 310b is located. In addition, in order to prevent the problem of stress concentration in the valve seat 200, in the valve seat 200 disclosed in the embodiment of the present application, the first liquid discharge channel 240 does not intersect with the first liquid inlet channel 220, which makes the valve seat 200 not have a cross intersection line due to the intersection of channels, ensuring that the stresses at different positions on the valve seat 200 are relatively dispersed, and preventing the valve seat 200 from being vulnerable due to stress concentration.

[0020] Moreover, a second liquid discharge channel 161 is provided at the position of the valve box 100 corresponding to the liquid discharge valve assembly 310b, so that the liquid flowing into the region where the liquid discharge valve assembly 310b is located can be discharged outside the valve box 100 through the second liquid discharge channel 161, completing an inhalation and discharge cycle of the liquid. In the case of repeatedly performing the inhalation and discharge cycle, the liquid can be continuously sucked through the second liquid inlet channel 17, and discharged through the second liquid discharge channel 161.

[0021] In more detail, the power end 900 drives the aforementioned liquid inlet and liquid discharge operations to reciprocate by driving the plunger 400. In the process of the plunger 400 moving away from the liquid inlet valve assembly 310a, the liquid is sucked in, and in the process of the plunger 400 moving toward the liquid inlet valve assembly 310a, the liquid is discharged. That is, in the plunger 400 pump disclosed in the embodiment of the present application, the plunger 400 is located on the side of the liquid inlet valve assembly 310a away from the valve seat 200, and an alternating cavity AP is formed between the plunger 400 and the liquid inlet valve assembly 310a. During the movement of the plunger 400, a portion of the plunger 400 can extend into the mounting cavity 110. To this end, one end of the mounting cavity 110 of the valve box 100 can extend to the side surface where the plunger 400 is located, so that the plunger 400 can extend into the mounting cavity 110 and reciprocate relative to the valve box 100.

[0022] Of course, to ensure a reliable seal between the plunger 400 and the mounting cavity 110, the pump is further provided with a packing assembly 333 and other components. Specifically, the packing box 331 is fixedly mounted on the side of the valve housing 100 where the plunger 400 is located. More specifically, if there are multiple valve housings 100 and the multiple valve housings 100 are fixedly connected via an adapter plate 710, the packing box 331 can be fixed to the adapter plate 710 to indirectly form a fixed relationship with the valve housing 100. The packing box 331 is also provided with a through cavity to accommodate the plunger 400; a sealing ring 334 is provided between the packing box 331 and the valve box 100, and the sealing ring 334 is usually formed of a metal material to provide a seal for the connection surface between the packing box 331 and the valve box 100, and a packing assembly 333 is provided on the side of the packing box 331 away from the valve box 100, which is used to provide a seal between the plunger 400 and the packing box 331. In order to ensure a stable matching relationship between the packing assembly 333 and the packing box 331, a packing pressure cap 332 is provided on the outside of the packing assembly 333, and the outer surface of the packing pressure cap 332 is threadedly connected to the inner surface of the through cavity of the packing box 331; in addition, a clamp 350 can also be provided on the side of the packing pressure cap 332 away from the packing assembly 333, and the plunger is connected to the power end 900 through the clamp 350.

[0023] As described above, since the valve seat 200, the liquid inlet valve assembly 310a, and the liquid discharge valve assembly 310b are all installed within the installation cavity 110 of the valve box 100, and even a part of the plunger 400 may be located in the installation cavity 110 of the valve box 100, and the second liquid inlet channel 171 and the second liquid discharge channel 161 of the valve box 100 are both in communication with the installation cavity 110 of the valve box 100. Furthermore, in order to ensure that the liquid inlet process and the liquid discharge process can be carried out independently, during the assembly process of the valve seat 200 and the valve box 100, it is necessary to ensure that the second liquid inlet channel 171 is isolated from the second liquid discharge channel 161, so as to ensure that the liquid entering the valve box 100 through the second liquid inlet channel 171 can only flow towards the valve seat 200 or flow through the valve seat 200 into the area where the liquid inlet valve assembly 310a is located. Correspondingly, the liquid in the area where the liquid discharge valve assembly 310b is located can only flow out of the valve box 100 through the second liquid discharge channel 161 and will not flow back into the second liquid inlet channel 171.

[0024] In order to ensure that the second liquid inlet channel 171 is isolated from the second liquid discharge channel 161, in the related art, sealing rings are provided at opposite ends of the valve seat 200 so that the two sealing rings and the side surface of the valve seat 200 can form a sealing structure to prevent the liquids in the second liquid inlet channel 171 and the second liquid discharge channel 161 from directly exchanging. However, during the operation of the pump, due to the driving effect of the liquid flow, the valve box 100 may slightly shake relative to the valve box 100, and even the valve seat 200 may rotate relative to the valve box 100, which will have a greater adverse impact on the sealing reliability of the sealing rings at opposite ends of the valve seat 200, thus interfering with the normal operation of the pump.

[0025] Therefore, in the valve seat 200 disclosed in the embodiment of the present application, its connecting side surface 215 includes a first sealing ring surface 211 and a second sealing ring surface 212, and the first sealing ring surface 211 is located between the first port 221 and the first seat end surface 213, and the second sealing ring surface 212 is located between the first port 221 and the second seat end surface 214. As the name implies, both the first sealing ring surface 211 and the second sealing ring surface 212 are used to provide a sealing effect, or they cooperate with structures such as sealing rings to produce a sealing effect.

[0026] More specifically, the first sealing ring surface 211 and the second sealing ring surface 212 are respectively engaged with the sealing ring to form a sealing engagement relationship with the cavity wall (i.e., the annular inner wall) of the installation cavity 110 of the valve box 100. More specifically, a first sealing member 611 is provided between the first sealing ring surface 211 and the cavity wall of the installation cavity 110, and a second sealing member 612 is provided between the second sealing ring surface 212 and the cavity wall of the installation cavity 110. The cavity wall of the installation cavity 110, the first sealing member 611, the connecting side surface 215, and the second sealing member 612 can enclose a sealed space, ensuring that the second liquid inlet passage 171 can only communicate with the first liquid inlet passage 220 through the aforementioned sealed space, and the second liquid discharge passage 161 is located outside the aforementioned sealed space, ensuring that the second liquid inlet passage 171 and the second liquid discharge passage 161 are isolated from each other.

[0027] As described above, in the axial direction of the valve seat 200, the first liquid discharge passage 240 penetrates through the valve seat 200. Therefore, among the opposite two end ports of the first liquid discharge passage 240, one is located on the side of the first sealing member 611 facing away from the second sealing member 612, and the other is located on the side of the second sealing member 612 facing away from the first sealing member 611. This can ensure that the second liquid discharge passage 161 is entirely located outside the aforementioned sealed space, enabling the second liquid inlet passage 171 to form a good isolation relationship with the second liquid discharge passage 161.

[0028] As described above, in the embodiment of the present application, the first sealing member 611 and the second sealing member 612 for providing the sealing function are both clamped between the connecting side surface 215 of the valve seat 200 and the cavity wall of the installation cavity 110 of the valve box 100. In this case, even if the valve seat 200 slightly shakes relative to the valve box 100, or even the valve seat 200 rotates relative to the valve box 100, it will not affect the sealing effect of the first sealing member 611 and the second sealing member 612, thereby ensuring that the sealing engagement relationship between the valve seat and the valve box is always relatively stable.

[0029] It should be noted that both the first sealing ring surface 211 and the second sealing ring surface 212 are closed ring-shaped structures, and they can be recessed or protruded relative to other parts of the connecting side surface 215 (i.e., the part of the connecting ring surface located between the first sealing ring surface 211 and the second sealing ring surface 212 in the axial direction of the valve seat 200), or they can be flush with the aforementioned other parts. This is not limited herein.

[0030] To further improve the sealing reliability of the first seal 611 and the second seal 612, during the machining process of the valve box 100 and the valve seat 200, an annular groove can be provided on at least one of the cavity wall of the installation cavity 110 of the valve box 100 and the connection side surface 215 of the valve seat 200. The annular groove can include a first annular groove 216 and a second annular groove. The first seal 611 can be installed in the first annular groove 216. Correspondingly, the second seal 612 is installed in the second annular groove. Both the first seal 611 and the second seal 612 are in sealing cooperation with the valve seat 200 and the valve box 100. Specifically speaking, the inner rings of the first seal 611 and the second seal 612 are each in sealing cooperation with the valve seat 200, and the outer rings of the first seal 611 and the second seal 612 are each in sealing cooperation with the valve box 100.

[0031] To reduce the machining difficulty, more specifically, the entire first annular groove 216 can be located on the outer peripheral surface of the valve seat 200 (i.e., the connection side surface 215) or the cavity wall of the installation cavity of the valve box 100. Correspondingly, the second annular groove can also be located on the outer peripheral surface of the valve seat 200 (i.e., the connection side surface 215) or the cavity wall of the installation cavity of the valve box 100. For example, as Figure 18 shown, the cavity wall of the installation cavity 110 of the valve box 100 is provided with a first annular groove 111 and a second annular groove 112 that are axially spaced apart as described above.

[0032] In another embodiment of the present application, as Figure 19 shown, the connection side surface 215 of the valve seat 200 is provided with a first annular groove 216 and a second annular groove 217 that are axially spaced apart as described above. Of course, in this case, the first annular groove 216 can be equivalent to at least a part of the first sealing ring surface 211, and the second annular groove 217 is equivalent to at least a part of the second sealing ring surface 212. That is, the first sealing ring surface 211 and the second sealing ring surface 212 are recessed relative to the other parts of the connection side surface 215.

[0033] When the valve seat 200 is provided with the first annular groove 216 and the second annular groove, since both of the foregoing are located on the outer surface of the valve seat 200, the processing difficulty of the first annular groove 216 and the second annular groove can be reduced. In addition, in this case, the valve box 100 can also be formed by an integral molding method. And by extending the installation cavity 110 to the outer surface of the valve box 100, during the process of assembling the valve box 100 and the valve seat 200, the first seal 611 can be pre-installed in the first annular groove 216, and the second seal 612 can be installed in the second annular groove. Then, the valve seat 200 can be gradually pushed into the installation cavity from the opening of the installation cavity 110 located on the outer surface of the valve box 100. And as the valve seat 200 gradually enters the installation cavity 110, the first seal 611 and the second seal 612 can be correspondingly squeezed to ensure that the first seal 611 and the second seal 612 can respectively form an extrusion fit relationship with the cavity wall of the installation cavity 110, which can further reduce the installation difficulty of the first seal 611 and the second seal 612.

[0034] In order to prevent the excessive number of annular grooves from having a greater adverse impact on the structural strength of the corresponding device, in another embodiment of the present application, one of the first annular groove 216 and the second annular groove is provided on the valve seat, and the other is provided on the valve box. For example, the valve seat is provided with the first annular groove 216, and the cavity wall of the installation cavity of the valve box is provided with the second annular groove. Correspondingly, in the axial direction of the valve seat, the first port 221 of the first liquid inlet channel 220 is located between the first annular groove 216 and the second annular groove.

[0035] In order to further improve the sealing reliability between the valve box 100 and the valve seat 200, in a further embodiment of the present application, the axis of the first sealing ring surface 211 can be the first axis 211a, the axis of the second sealing ring surface 212 can be the second axis 212a, and the first axis 211a and the second axis 212a are arranged non-collinearly. Of course, during the design of the valve box 100, it is also necessary to make the axes of the parts of the installation cavity 110 of the valve box 100 that cooperate with the first sealing ring surface 211 and the second sealing ring surface 212 non-collinear, so as to ensure that the valve seat 200 is installed at the corresponding position in the installation cavity 110 of the valve box 100, and the valve seat 200 cannot rotate relative to the valve box 100, so that the relative position relationship between the valve seat 200 and the valve box 100 is more stable, so as to further improve the stability of the sealing fit relationship between the valve seat 200 and the valve box 100.

[0036] Specifically, the diameters and other dimensions of the parts of the cavity wall of the installation cavity 110 that respectively correspond to and cooperate with the first sealing ring surface 211 and the second sealing ring surface 212 can be designed such that, in a direction perpendicular to the axial direction of the valve seat 200, the spacing between the first sealing ring surface 211 and the corresponding area in the installation cavity 110, and the spacing between the second sealing ring surface 212 and the corresponding area in the installation cavity 110 are both less than a certain set value, thereby ensuring that the valve seat 200 cannot rotate relative to the valve box 100.

[0037] In addition, in the case of adopting the above technical solution, the valve seat 200 can be correspondingly installed according to the installation position of the second liquid inlet channel 171 on the valve box 100, so that the first liquid inlet channel 220 of the valve seat 200 can be arranged opposite to the second liquid inlet channel 171 of the valve box 100. Since the valve seat 200 and the valve box 100 are in a relatively fixed state, the opposite state between the first liquid inlet channel 220 and the second liquid inlet channel 171 can be continuously maintained, thereby making the efficiency of the liquid flowing between the second liquid inlet channel 171 and the first liquid inlet channel 220 relatively higher, achieving the purpose of improving the liquid inlet efficiency.

[0038] An embodiment of the present application discloses a hydraulic end, which includes a valve seat 200, a valve box 100, a first sealing member 611 and a second sealing member 612. Among them, the valve seat cooperates with the valve box 100, and the first port 221 of the first liquid inlet channel 220 of the valve seat 200 extends and is located on the connection side surface 215, so that the first liquid inlet channel 220 of the valve seat 200 can communicate with the corresponding second liquid inlet channel 171 on the valve box 100.

[0039] To ensure that while the first liquid inlet channel 220 and the second liquid inlet channel 171 are interconnected, the second liquid inlet channel 171 and the second liquid discharge channel 161 on the valve box 100 can be kept isolated from each other. In the hydraulic end disclosed in the embodiments of the present application, the valve seat 200 is provided with a first annular groove 216. The first annular groove 216 is located on the outer peripheral surface of the valve seat 200. The cavity wall of the installation cavity 110 of the valve box 100 is provided with a second annular groove 112. The first seal 611 is installed in the first annular groove 216, and the second seal 612 is installed in the second annular groove 112. Both the first seal 611 and the second seal 612 are in sealing cooperation with the valve seat 200 and the valve box 100. Thus, the connecting side surface 215 of the valve seat 200, the first seal 611, the cavity wall of the installation cavity 110, and the second seal 612 can enclose a space. At the same time, both the first liquid inlet channel 220 and the second liquid inlet channel 171 are in communication with the aforementioned space. Of course, the first liquid discharge channel 240 of the valve seat 200 and the second liquid discharge channel 161 of the valve box 100 are both located outside the aforementioned space. Under the sealing effect provided by the first seal 611 and the second seal 612, the second liquid inlet channel 171 of the valve box 100 can be interconnected with the first liquid inlet channel 220 of the valve seat 200, and it is ensured that the second liquid inlet channel 171 of the valve box 100 can be isolated from the second liquid discharge channel 161 of the valve box 100, thereby ensuring that the liquid inlet process and the liquid discharge process can be carried out independently and separately.

[0040] At the same time, since the first annular groove 216 is located on the outer peripheral surface of the valve seat 200, and the second annular groove 112 is located on the cavity wall of the installation cavity 110 of the valve box 100, the second annular groove 112 is also located on the outer peripheral side of the valve seat 200. Thus, during the working process of the valve seat 200, even if the valve seat 200 generates a slight shake relative to the valve box 100, the sealing cooperation relationship between the valve seat 200 and the valve box 100 will not be affected, so as to ensure that the sealing reliability between the valve seat 200 and the valve box 100 is always relatively high. In addition, compared with the technical solutions in which both the first annular groove 216 and the second annular groove 112 are provided on the valve box 100 or the valve seat 200, in the embodiments of the present application, by making the first annular groove 216 and the second annular groove 112 be located on the valve seat 200 and the valve box respectively, it can also prevent the excessive groove structures on the valve box 100 and the valve seat 200 from having a greater adverse impact on the structural strength of the corresponding devices (i.e., the valve box 100 or the valve seat 200).

[0041] In the above embodiments of the present application, the axis of the first sealing ring surface 211 and the axis of the second sealing ring surface 212 can be arranged non - collinearly, and by adaptively designing the corresponding areas in the installation cavity 110 of the valve box 100, after the valve seat 200 is installed in the installation cavity 110 of the valve box 100, the valve seat 200 cannot rotate relative to the valve box. In another embodiment of the present application, in order to reduce the processing difficulty of the valve seat 200, optionally, the first axis and the second axis are collinear. More specifically, in the axial direction of the valve seat 200, the axes of any ring structure in the valve seat are collinearly arranged. This enables the valve seat 200 to directly form structures such as the first sealing ring surface 211, the second sealing ring surface 212, and the first annular groove 216 at different positions on its outer peripheral surface (i.e., the connecting side surface 215) after being installed on the machine tool. This enables the above - mentioned structures to be completed in one single machine - tool processing process, thereby improving the processing efficiency of the valve seat 200.

[0042] In the above - mentioned embodiments, by designing the dimensions of different positions in the installation cavity 110 of the valve box 100, after the valve seat 200 with the above - mentioned first axis 211a and second axis 212a is installed in the installation cavity 110 of the valve box 100, the valve seat 200 cannot rotate relative to the valve box 100. In another embodiment of the present application, in order to reduce the processing difficulty of the valve box 100, as Figure 18 shown, it is also possible to make the axes of any position in the installation cavity 110 of the valve box 100 collinear. In this case, by designing parameters such as the distance between the first axis 211a and the second axis 212a of the valve seat 200, after the valve seat 200 is installed in the valve box 100, it still cannot rotate circumferentially relative to the valve box 100. Of course, in this case, there may be a situation where the valve seat 200 can rotate relative to the valve box 100 by a small angle, which basically does not affect the sealing relationship between the valve seat 200 and the valve box 100, but can significantly reduce the processing difficulty of the valve box 100.

[0043] As described above, the valve seat 200 is provided with a first liquid inlet channel 220. Optionally, only one first liquid inlet channel 220 is provided on the valve seat 200. In other embodiments of the present application, in order to further improve the liquid inlet efficiency of the valve seat 200, the number of the first liquid inlet channels 220 can be multiple. Of course, in order to ensure that each first liquid inlet channel 220 can communicate with the second liquid inlet channel 171 on the valve box 100, the first ports 221 of the multiple first liquid inlet channels 220 are all located on the connecting side surface 215. More specifically, the first ports 221 of the multiple first liquid inlet channels 220 can be circumferentially spaced apart along the connecting side surface 215.

[0044] As described above, the second liquid inlet passage 171 on the valve box 100 is located on the outer periphery of the installation cavity 110. Therefore, when the number of the first liquid inlet passages 220 on the valve seat 200 is multiple, the number of the second liquid inlet passages 171 on the valve box 100 can also be multiple, and at least one second liquid inlet passage 171 is correspondingly provided for any one of the first liquid inlet passages 220 of the valve seat 200 installed in a certain installation cavity 110. Considering that other channel structures usually need to be provided on the valve box 100, in order to reduce the design difficulty, in a specific embodiment of the present application, any one of the installation cavities 110 in the valve box 100 can correspondingly be provided with one or two second liquid inlet passages 171.

[0045] When the number of the second liquid inlet passages 171 corresponding to any one of the installation cavities 110 is less than the number of the first liquid inlet passages 220 of the valve seat 200 installed in this installation cavity 110, a communication cavity can be formed between the connection side surface 215 and the cavity wall of the installation cavity 110 by setting the area where the first port 221 is located on the connection side surface 215 to be recessed. When the aforementioned recessed area of the connection side surface 215 is integrally surrounded, each of the first liquid inlet passages 220 and each of the second liquid inlet passages 171 can communicate with the aforementioned communication cavity, ensuring that the liquid entering the aforementioned communication cavity through the second liquid inlet passage 171 can flow into different first liquid inlet passages 220 respectively.

[0046] It should be noted that in the embodiment of the present application, since the number of the second liquid inlet passages 171 corresponding to any one of the installation cavities 110 is less than the number of the first liquid inlet passages 220 of the valve seat 200 installed in this installation cavity 110, furthermore, when one or several of the multiple first liquid inlet passages 220 are directly opposite to one or more of the second liquid inlet passages 171 one by one, it is objectively true that the remaining one or several of the multiple first liquid inlet passages 220 cannot be directly opposite to other second liquid inlet passages 171.

[0047] Based on the above situation, in order to improve the liquid inlet efficiency of each first liquid inlet passage 220, optionally, the multiple first ports 221 are distributed at intervals along the circumferential direction of the connection side surface 215, which can improve the dispersion of the multiple first liquid inlet passages 220, so as to ensure that the liquid inlet efficiency of a certain one or several first liquid inlet passages 220 that are not directly opposite to the second liquid inlet passages 171 is also relatively high. In a further embodiment of the present application, the multiple first liquid inlet passages 220 are uniformly arranged along the direction around the axis of the valve seat 200 (i.e., the circumferential direction of the connection side surface 215), which can further improve the structural reliability of the valve seat 200.

[0048] In addition, in the case where the number of the second liquid inlet channels 171 is plural, the plural second liquid inlet channels 171 can also be uniformly arranged in the direction around the axis of the valve seat 200. For example, in the case where the valve seat 200 has a cube-shaped structure as a whole, in a specific embodiment of the present application, one second liquid inlet channel 171 can be arranged above and below any installation cavity 110, wherein the distribution directions of the above and below are specifically the second direction, that is, Figure 16 the direction Y in Figure 16 . Of course, in the case where there are other requirements, only one second liquid inlet channel 171 can be arranged above or below any installation cavity 110, and by appropriately increasing parameters such as the cross-sectional area of the second liquid inlet channel 171, it is also possible to ensure to a certain extent that one second liquid inlet channel 171 can supply liquid to the plural first liquid inlet channels 220 more efficiently. In addition, for the extending direction of the second liquid inlet channel 171, it can be parallel to the second direction, or can also be inclined relative to the second direction. Of course, in order to improve the liquid inlet efficiency of the second liquid inlet channels 171 respectively corresponding to the plural installation cavities 110 as much as possible and improve the space utilization rate of the valve box 100, the extending direction of each second liquid inlet channel 171 is located in the plane formed by the second direction and the first direction.

[0049] In order to improve the liquid drainage efficiency of the valve seat 200, similarly, the number of the first liquid drainage channels 240 can also be plural, and the plural first liquid drainage channels 240 are distributed at intervals along the circumferential direction of the connecting side surface 215. Optionally, the first liquid drainage channel 240 is a curved extending structure. In order to improve the liquid drainage efficiency of the first liquid drainage channel 240, in a specific embodiment of the present application, the first liquid drainage channel 240 is a linear structure. As described above, the first liquid drainage channel 240 can provide a communication function for the liquid inlet valve assemblies 310a and the liquid drainage valve assemblies 310b on the opposite sides of the valve seat 2; for this purpose, in a specific embodiment of the present application, the first liquid drainage channel 240 can extend along the axis of the valve seat 200, that is, the extending directions of the plural first liquid drainage channels 240 are parallel to each other and are parallel to the straight line where the axis of the valve seat 200 is located.

[0050] In order to improve the space utilization rate of the valve seat 200, in another embodiment of the present application, the extending direction of the first liquid drainage channel 240 can also be inclined relative to the axis of the valve seat 200. In this case, the extending directions of the plural first liquid drainage channels 240 may no longer be parallel to each other, but as a whole, the plural first liquid drainage channels 240 can still be distributed at intervals in the direction around the axis of the valve seat 200. Of course, in the case where the numbers of the first liquid inlet channels 220 and the first liquid drainage channels 240 are both plural, any first liquid inlet channel 220 and any first liquid drainage channel 240 do not intersect, so as to ensure that the valve seat 200 will not generate a cross intersection line and improve the overall working life of the valve seat 200.

[0051] As described above, in the hydraulic end of the pump, along the axial direction of the valve seat 200, a liquid inlet valve assembly 310a and a liquid discharge valve assembly 310b are respectively provided outside the opposite ends of the valve seat 200. In order to increase the liquid holding capacity of the regions outside the opposite ends of the valve seat 200 and improve the fitting effect between the valve seat 200 and the valve assembly, in a specific embodiment of the present application, the valve seat 200 has a first fitting concave surface 251, and the first fitting concave surface 251 is recessed relative to the first seat end surface 213. Among them, the first fitting concave surface 251 is used to cooperate with the valve assembly. For example, if the first seat end surface 213 is located on the side of the valve seat 200 facing the liquid inlet valve assembly 310a, then the first fitting concave surface 251 is used to cooperate with the liquid inlet valve assembly 310a.

[0052] More specifically, during the liquid inlet process, the plunger 400 moves away from the valve seat 200, so that the plunger 400 can generate a suction effect on the liquid in the second liquid inlet channel 171, so that the liquid flows along the second liquid inlet channel 171 and only the first liquid inlet channel 220 to the region where the liquid inlet valve assembly 310a is located. During this process, the liquid inlet valve assembly 310a opens. Correspondingly, during the liquid discharge process, the plunger 400 moves towards the valve seat 200, so that the plunger 400 can apply a pushing effect on the liquid located in the region where the liquid inlet valve assembly 310a is located, thereby driving the liquid to flow through the first liquid discharge channel 240 to the region where the liquid discharge valve assembly 310b is located, opening the liquid discharge valve assembly 310b, and discharging the liquid to the outside of the valve box 100 through the second liquid discharge channel 161.

[0053] Optionally, the axis of the first fitting concave surface 251 is non-collinear with the first axis 211a. For example, the angle between the two can be greater than 0° and less than 90°. Or, in another embodiment of the present application, the axis of the first fitting concave surface 251 can also be parallel and non-collinear with the first axis 211a. In this case, the liquid inlet valve assembly 310a and the valve seat 200 are in a misaligned distribution state.

[0054] In order to improve the fitting accuracy between the valve element assembly that fits with the first fitting concave surface 251 and the valve seat 200, and to reduce the flow rate of the liquid due to actions such as turning or translation during the flow process, in another embodiment of the present application, the axis of the first fitting concave surface 251 can be collinearly arranged with the axis of the first sealing ring surface 211 (i.e., the first axis 211a) to improve the liquid exchange efficiency. Further, on one side of the second seat end surface 214 in the valve seat 200, a fitting concave surface can also be provided. Specifically, this fitting concave surface is the second fitting concave surface 252, and the second fitting concave surface 252 is recessed relative to the second seat end surface 214, so that the valve seat can increase the volume of the area where the corresponding valve element assembly is located through the second fitting concave surface 252, and can also improve the fitting stability between the valve seat and the valve element assembly on the side where the second fitting concave surface 252 is located to a certain extent.

[0055] Similarly, the axis of the second fitting concave surface 252 can also be non - collinearly arranged with the axis of the second sealing ring surface 212 (i.e., the second axis). In another embodiment of the present application, in order to further improve the liquid exchange efficiency, the axis of the second fitting concave surface 252 can be collinearly arranged with the second axis 212a.

[0056] When the first fitting concave surface 251 and the second fitting concave surface 252 are respectively provided at opposite ends of the valve seat 200, the number of the first liquid inlet channels 220 and the second liquid inlet channels 171 can both be multiple. The first ports 221 of the multiple first liquid inlet channels 220 all extend to the connecting side surface 215, and the other end ports of the multiple first liquid inlet channels 220 can all extend to the central region of the valve seat 200 and be close to the side of the first fitting concave surface 251. In this case, a cavity can be provided at a position in the central region of the valve seat 200 close to the first fitting concave surface 251, so that one - end ports of the multiple first liquid inlet channels 220 can all communicate with the aforementioned cavity. At the same time, the aforementioned cavities all communicate with the first fitting concave surface 251, so that when the inlet valve element assembly 310a is opened, the aforementioned cavity can communicate with the area where the inlet valve element assembly 310a is located, to further improve the liquid inlet efficiency.

[0057] Meanwhile, one end port of each of the plurality of second liquid inlet channels 171 can extend to the first seat end face 213. Since the cavity is provided on one side of the central region of the valve seat 200 close to the first mating concave surface 251, the aforementioned ports of the plurality of second liquid inlet channels 171 can be located in the relatively outer region of the first seat end face 213, which makes the dispersion between the first liquid inlet channel 220 and the first liquid discharge channel 240 relatively stronger, so as to further improve the structural stability of the valve seat 200 and can also reduce the mutual interference between the liquid inlet process and the liquid discharge process as much as possible. Moreover, each of the first liquid discharge channels 240 can extend obliquely relative to the axis of the valve seat 200, so that the other end port (denoted as the second port 241) of each of the first liquid discharge channels 240 can extend to the central region of the second mating concave surface 252 and communicate with the liquid discharge valve assembly 310b located on the side where the second mating concave surface 252 is located.

[0058] Based on the valve seat 200 disclosed in any one of the above embodiments, an embodiment of the present application further discloses a hydraulic end, which includes a valve box 100 and any one of the above valve seats 200. As described above, the valve box 100 is provided with an installation cavity 110, a second liquid inlet channel 171, and a second liquid discharge channel 161. The valve seat 200 can be installed in the installation cavity 110 of the valve box 100, and the second liquid inlet channel 171 is communicated with the first liquid inlet channel 220, and the second liquid discharge channel 161 is communicated with the first liquid discharge channel 240. Of course, the hydraulic end may further include the first seal 611 and the second seal 612 used to provide a sealing effect for the valve seat 200 and the valve box 100. In addition, the hydraulic end may further include a liquid inlet valve assembly 310a and a liquid discharge valve assembly 310b.

[0059] More specifically, as described above, the valve seat 200 is installed in the installation cavity 110 of the valve box 100. To ensure that the valve seat 200 can be installed in the installation cavity 110, optionally, the valve box 100 includes two symmetrically arranged structural parts, and the two structural parts are butt-jointed and fixed to enclose the installation cavity 110. Then, the valve seat 200 can be installed in one of the structural parts first, and then the two structural parts are fixedly connected to ensure that the valve seat 200 can be installed in the installation cavity 110.

[0060] In order to improve the structural reliability of the valve box 100 and improve the sealing performance of the valve box 100, in another embodiment of the present application, the installation cavity 110 penetrates through the valve box 100 along the axis of the valve seat 200, that is, in the axial direction of the valve seat 200, the installation cavity 110 extends from one end face of the valve box 100 to the other end face of the valve box 100. At the same time, by making the size of the opening of the installation cavity 110 on at least one end face of the valve box 100 larger than the maximum diameter size of the valve seat 200, it can also be ensured that the valve seat 200 can be installed in the installation cavity 110 of the valve box 100 through the aforementioned opening.

[0061] Of course, after the valve seat 200 is installed within the installation cavity 110, in order to ensure that the installation cavity 110 can still form a sealed environment, the hydraulic end may further include structures such as a discharge gland nut 341 and a discharge gland 342. Among them, the discharge gland 342 is located on the side of the liquid discharge valve assembly 310b away from the valve seat 200, and the discharge gland 342 is relatively fixed to the valve box 100. The discharge gland nut 341 is installed on the side of the discharge gland 342 away from the liquid discharge valve assembly 310b, and the discharge gland nut 341 can be threadedly connected to the valve box 100 to form a relatively reliable fixed relationship between the discharge gland nut 341 and the valve box 100. Of course, a sealing ring may be provided between the discharge gland 342 and the valve box 100 to ensure a relatively reliable sealing effect therebetween.

[0062] As described above, the valve box 100 is provided with an installation cavity 110, and devices such as a valve seat 200 are installed in the installation cavity 110. In order to further improve the working efficiency of the hydraulic end, in a specific embodiment of the present application, the valve box 100 may be provided with a plurality of installation cavities 110, and devices such as a valve seat 200, a liquid inlet valve assembly 310a, and a liquid discharge valve assembly 310b may be installed in any one of the installation cavities 110.

[0063] In order to make the valve box 100 more adaptable, in the hydraulic end disclosed in another embodiment of the application, the number of valve boxes 100 is plural. Correspondingly, each valve box 100 is provided with a correspondingly connected installation cavity 110, a second liquid inlet channel 171, and a second liquid discharge channel 161. Of course, the number of installation cavities 110 provided in each installation cavity 110 may be one or more, which is not limited herein. In a specific embodiment of the present application, if the hydraulic end includes a plurality of valve boxes 100, each valve box 100 may be provided with only one installation cavity 110, and the specific number of valve boxes 100 required for the hydraulic end may be flexibly selected according to the actual situation of the on-site working conditions. At the same time, in order to facilitate the assembly work between the plurality of valve boxes 100, in the embodiment of the present application, the hydraulic end further includes an adapter plate 710. The plurality of valve boxes 100 may be distributed along the length direction of the adapter plate 710 and are fixedly connected to the adapter plate 710. That is, in the hydraulic end disclosed in the embodiment of the present application, the adapter plate 710 can be used as a device to provide an installation basis for the plurality of valve boxes 100, so that the plurality of valve boxes 100 can form a relatively fixed relationship through the adapter plate 710 to reduce the assembly difficulty of the plurality of valve boxes 100.

[0064] Specifically, the adapter plate 710 can be formed of a material with relatively high structural strength such as metal. The adapter plate 710 is generally a rectangular plate-like structural member, and its dimensions such as length, width, and thickness can be flexibly selected according to actual requirements. In addition, multiple valve boxes 100 can form a fixed assembly relationship with the adapter plate 710 through threaded connectors. Among them, threaded holes can be provided on the valve box 100, through holes are provided on the adapter plate 710, and the connecting bolts can pass through the through holes of the adapter plate 710 to form a threaded connection with the threaded holes on the valve box 100. Considering that parameters such as the weight of devices such as the valve box 100 are relatively large, and the vibration generated during the working process is relatively intense, in order to further improve the assembly stability between the valve boxes 100, in another embodiment of the present application, through holes can be provided on the valve box 100, and the connecting bolts can pass through the through holes of the adapter plate 710 and the through holes on the valve box 100 together, and by installing a connecting nut at the end of the connecting bolt far from the nut, the connection stability between any valve box 100 and the adapter plate 710 is further improved. Among them, the connecting bolt and the connecting nut form a threaded connector 510. In addition, since the valve box 100 also needs to be connected to the power end 900, further, in the case where multiple valve boxes 100 are connected through the adapter plate 710, the valve box 100 can be indirectly fixedly connected to the power end 900 by means of the adapter plate 710 and the power end 900.

[0065] As described above, in the case where multiple installation cavities 110 are provided at the hydraulic end, a second liquid inlet channel 171 and a second liquid discharge channel 161 need to be correspondingly provided for each installation cavity 110. To facilitate the mutual connection between the hydraulic end and the external pipeline, the multiple second liquid inlet channels 171 and multiple second liquid discharge channels 161 provided on the hydraulic end can be relatively regularly distributed. For example, the second liquid inlet channels 171 can be correspondingly provided directly above each installation cavity 110, which enables the multiple second liquid inlet channels to be arranged at intervals along the distribution direction of the multiple installation cavities 110. In this case, the liquid inlet manifold 730 can be simultaneously connected to the multiple second liquid inlet channels, so that the sucked liquid can be conveyed to the multiple second liquid inlet channels through the liquid inlet manifold 730 together. Of course, another second liquid inlet channel can be further provided below each installation cavity 110, and the multiple second liquid inlet channels located below the installation cavity 110 can also be interconnected through another liquid inlet manifold 730 to improve the liquid inlet efficiency and the space utilization rate of the valve box 100.

[0066] In order to make the volume and weight of the entire hydraulic end relatively small, and make the external shape of the entire hydraulic end relatively regular, facilitating transportation, installation, and other operations, in a specific embodiment of the present application, multiple installation cavities 110 can be arranged in a straight line direction, and in the extending direction of the installation cavity 110, that is, along the axial direction of the valve seat 200, the opposite ends of the multiple installation cavities 110 can be set flush. AsFigure 16 and Figure 18 As shown in Figure 18 , in a specific embodiment of the present application, any valve box may be provided with one or more installation cavities 110, and each installation cavity penetrates through the valve box along the axial direction of the valve seat 200. The plurality of installation cavities 110 are distributed in a direction perpendicular to the axial direction of the valve seat 200. Specifically, the distribution direction of the plurality of installation cavities 110 may be the third direction. In the embodiment of the present application, the third direction may be perpendicular to the first direction (i.e., the axial direction of the valve seat 200). Further, among the first direction, the second direction, and the third direction, any two of them are perpendicular to each other. This can maximize the shape regularity of the hydraulic end and minimize the overall volume of the hydraulic end as much as possible. In this case, the inlet manifold 730 and the manifold member 720 can both extend along the third direction, so that the shape regularity of the entire hydraulic end is relatively good, and the external volume of the entire hydraulic end is further reduced, improving the storage and transportation efficiency of the hydraulic end. Intuitively, the third direction is Figure 16 the direction Z in Figure 16 .

[0067] Similarly, for the second drain channels 161 corresponding to the plurality of installation cavities 110 respectively, they can also be regularly distributed. Optionally, in a specific embodiment of the present application, a second drain channel 161 may be provided at another position above each installation cavity 110, and the plurality of second drain channels 161 are also arranged at intervals as a whole along the distribution direction of the plurality of installation cavities 110. Based on this, in the hydraulic end disclosed in the embodiment of the present application, a manifold member 720 may further be included. The manifold member 720 is provided with a manifold cavity 721 and a plurality of liquid inlet ports. The plurality of liquid inlet ports are distributed at intervals along the length direction of the adapter plate 710, and any liquid inlet port can communicate with the corresponding second drain channel 161, so that the liquids discharged through the plurality of second drain channels 161 respectively can be collected into the manifold cavity 721 of the manifold member 720.

[0068] Meanwhile, in order to facilitate the transportation of the liquid in the manifold member 720, in the embodiment of the present application, a drain port may be provided at one end of the manifold cavity 721, and by using a fastener 520, a discharge flange 320 may be installed at the drain port. The discharge flange 320 can communicate with a corresponding flexible or rigid manifold to pump the liquid to the required position. In addition, a tee 360 may be provided at the other end of the manifold cavity 721 to further improve the control convenience of the liquid transportation path.

[0069] As described above, during the operation of the pump, under the influence of the driving action of the liquid flow, the valve seat 200 may slightly shake or move relative to the valve box 100. Further, in order to improve the service life of the valve seat 200, in a specific embodiment of the present application, the hydraulic end may further include a wear-resistant ring 640. The wear-resistant ring 640 can be sleeved outside the first sealing ring surface 211. Of course, the hardness of the wear-resistant ring 640 is greater than that of the valve seat 200, and / or the wear resistance of the wear-resistant ring 640 is greater than that of the valve seat 200. Then, by using the wear-resistant ring 640 to rub against the cavity wall of the installation cavity 110 of the valve box 100, the friction area between the valve seat 200 and the valve box 100 is reduced, and the service life of the valve seat 200 is improved. Of course, when the wear-resistant ring 640 is sleeved outside the first sealing ring surface 211 of the valve seat 200, it is also necessary to make the inner side of the wear-resistant ring 640 be sealingly connected to the first sealing ring surface 211, and the outer side of the wear-resistant ring 640 be sealingly connected to the valve box 100. More specifically, a first sealing member 611 can be provided between the inner side of the wear-resistant ring 640 and the first sealing ring surface 211, and a third sealing member 613 can be provided between the outer side of the wear-resistant ring 640 and the valve box 100. Moreover, a first annular groove 216 can be provided on the first sealing ring surface 211, and another annular groove can be provided on the cavity wall of the installation cavity 110 to respectively provide installation and limiting functions for the first sealing member 611 and the third sealing member 613, further improving the sealing reliability among the three.

[0070] As described above, the liquid inlet valve assembly 310a and the liquid discharge valve assembly 310b are respectively provided at the opposite ends of the valve seat 200. Among them, since the liquid inlet process is driven by the suction action of the plunger 400, the flow rate of the liquid in the second liquid inlet channel 171 and the first liquid inlet channel 220 is relatively slow during the process of entering the area where the liquid inlet valve assembly 310a is located. During the liquid discharge process, it is driven by the pushing action of the plunger 400, so that the pressure and flow rate of the liquid in the area where the liquid discharge valve assembly 310b is located are relatively high when it is discharged to the outside of the valve box 100 through the second liquid discharge channel 161. At the same time, since the discharge valve assembly usually includes a valve body and a valve rubber sheet, and the valve body forms a sealing fit relationship with the valve seat 200 through the valve rubber sheet, the valve rubber sheet is used to seal the mating surface between the valve body and the valve seat 200, and during the liquid discharge process, the valve rubber sheet is subjected to the extrusion action of high-pressure liquid.

[0071] Therefore, if the valve rubber is damaged, the liquid flowing into the second drain channel 161 will invade the valve rubber and flow at high speed towards the mating surface of the valve seat 200 facing the valve body, thereby eroding the mating surface of the valve seat 200 facing the valve body (i.e., the surface on the side where the second seat end face 214 is located). This can easily lead to damage to the valve seat 200 and cause the high-pressure chamber HP where the second drain channel 161 is located to communicate with the low-pressure chamber LP where the second inlet channel 171 is located, resulting in pressure leakage between the high and low chambers, causing the pipe manifold to burst and seriously affecting the personal safety of the staff.

[0072] Therefore, in a specific embodiment of the present application, the hydraulic end may further include a protective plate 620. The protective plate 620 is used to protect the position of the valve seat 200 facing the mating surface between the valve seat 200 and the valve body, so as to prevent the liquid in the high-pressure chamber HP from directly eroding the valve seat 200 as much as possible in the case of damage to the valve rubber of the discharge valve assembly. Of course, since the second port 241 of the first drain channel 240 is also provided at one end of the valve seat 200 facing the discharge valve assembly, in order to prevent the protective plate 620 from interfering with the normal drainage work of the first drain channel 240, the protective plate 620 needs to be provided with structures such as avoidance openings to avoid the first drain channel 240.

[0073] At the same time, in order to ensure that the valve seat 200 and the discharge valve assembly 310b can still form a normal mating relationship when a protective plate 620 is provided on the side of the valve seat 200 facing the discharge valve assembly 310b, at least one of the valve body of the discharge valve assembly 310b and the valve seat 200 may be provided with a receiving groove 230 to provide an installation space for the protective plate 620 by using the receiving groove 230. Considering that the thickness and size of the valve body are usually relatively small, in a specific embodiment of the present application, the valve seat 200 may be provided with the receiving groove 230, and the receiving groove 230 is recessed relative to the second seat end face 214. As above, the valve seat 200 may further be provided with a second mating concave surface 252. In this case, the receiving groove 230 may be located in the central region of the second mating concave surface 252, and the receiving groove 230 may be further recessed relative to the second mating concave surface 252, and the second port 241 of the first drain channel 240, that is, the end of the first drain channel 240 facing away from the first seat end face 213, is communicated with the receiving groove 230. In other words, the first seat end face 213 is communicated with the receiving groove 230 through the first drain channel 240, that is, the first drain channel 240 extends from the first seat end face 213 to the receiving groove 230, ensuring that the liquid flowing out through the first drain channel 240 can flow to the area where the discharge valve assembly 310b is located through the receiving groove 230 and is finally discharged out of the valve box 100 through the second drain channel 161.

[0074] More specifically, as Figure 9 shown, the protective plate 620 includes a bridging portion 621 and at least one shielding rib plate 622. Each shielding rib plate 622 is connected to the outer side of the bridging portion 621. That is, in the hydraulic end disclosed in the embodiments of the present application, the bridging portion 621 provides an assembling function for the shielding rib plate 622. Of course, when the number of the shielding rib plate 622 is one, there may be no obvious boundary between the bridging portion 621 and the shielding rib plate 622 in terms of structure. And when the number of the shielding rib plate 622 is multiple, the portion located at the center of the multiple shielding rib plates 622 can be the bridging portion 621.

[0075] After the protective plate 620 is installed in the receiving groove 230, the main component that provides protection for the valve seat 200 is the shielding rib plate 622. Therefore, the shielding rib plate 622 needs to avoid the first liquid discharge channel 240. That is, in the circumferential direction of the connecting side surface 215, that is, in the direction around the axis of the valve seat 200, the shielding rib plate 622 is clamped between the first liquid discharge channels 240. Of course, when only one first liquid discharge channel 240 is provided on the valve seat 200, the number of the shielding rib plate 622 can also be one, and the shielding rib plate 622 extends from one side of the first liquid discharge channel 240 to the other side. For example, in the direction around the axis of the valve seat 200, if the angle spanned by the first liquid discharge channel 240 is 90°, then the angle spanned by the shielding rib plate 622 can be 270°. In addition, in the above embodiments, multiple first liquid discharge channels 240 can be provided on the valve seat 200. In this case, the number of the shielding rib plate 622 can also be multiple, and in the direction around the axis of the valve seat 200, the first liquid discharge channels 240 and the shielding rib plates 622 are alternately distributed, so as to use each shielding rib plate 622 to shield the area of the second port 241 of the valve seat 200 where no first liquid discharge channel 240 is provided.

[0076] Specifically, the protective plate 620 can be formed of a metal material. In order to further improve the protection effect of the protective plate 620, in another embodiment of the present application, the hardness of the protective plate 620 can be made greater than the hardness of the valve seat 200, and / or the wear resistance of the protective plate 620 can be made greater than the wear resistance of the valve seat 200. In this case, the service life of the protective plate 620 can be further improved to further enhance the protection effect of the protective plate 620 on the valve seat 200. More specifically, in a specific embodiment of the present application, the forming material of the protective plate 620 can include at least one of zirconia, nickel-based tungsten carbide, cobalt-based tungsten carbide, titanium carbide, boron nitride, and ceramics. This enables the protective plate 620 to have relatively high strength and wear resistance while having relatively low cost and relatively low processing difficulty.

[0077] As described above, the bridging portion 621 is located in the center of the shielding rib 622. Optionally, the bridging portion 621 is a plate-shaped, non-porous structural member, meaning that the two opposing sides of the bridging portion 621 are not interconnected. Because the mating surface between the valve body in the drainage valve assembly 310b and the valve seat 200 cannot directly extend to the center of the valve seat 200, in another embodiment of the present application, a through hole 621a can be provided in the center of the bridging portion 621. The presence of the through hole does not significantly reduce the shielding comprehensiveness of the protective plate 620. The through hole can be a circular hole, extending through the bridging portion 621 along the thickness direction of the bridging portion 621. In this case, the processing and transportation of the entire protective plate 620 are facilitated, and the weight of the entire protective plate can be reduced, thereby appropriately reducing the weight of the entire hydraulic end.

[0078] In addition, in the above embodiment, the valve seat 200 can also be provided with a second mating concave surface 252, and it is recessed relative to the second seat end face 214. The valve body of the drainage valve assembly 310b can be fitted with the second mating concave surface 252, and when the valve seat 200 is provided with an accommodating groove 230, the second mating concave surface 252 is connected between the second seat end face 214 and the accommodating groove 230. To this end, in the process of forming the second mating concave surface 252, the extension position and extension direction of the second mating concave surface 252 can also be designed so that when the second mating concave surface 252 extends to the side where the accommodating groove 230 is located, it can face the shielding rib 622 of the protective plate 620. Therefore, when the valve rubber of the drainage valve assembly 310b is damaged, causing the liquid in the high-pressure chamber to erode along the second mating concave surface 252 toward the position where the accommodating groove 230 is located, the second mating concave surface 252 can be used to guide the high-pressure liquid to mainly erode the area where the shielding rib 622 of the protective plate 620 is located, so as to further improve the service life of the valve seat 200 and improve the safety of the entire pump.

[0079] As described above, the protective plate 620 can be installed in the accommodating groove 230. Optionally, the protective plate 620 forms a fixed connection relationship with the valve seat 200 through devices such as threaded connectors. In order to reduce the difficulty of installing the protective plate 620 and minimize the number of structures such as blind holes or through holes provided on the valve seat 200 to prevent adverse effects on the structural strength of the valve seat 200, in another embodiment of the present application, the protective plate 620 can be made to have an interference fit with the accommodating groove 230.

[0080] Specifically, the outer edge of the shielding rib 622 in the protective plate 620 that is away from the bridging portion 621 can be pressed against the inner wall of the accommodating groove 230 to ensure that the protective plate 620 can form a relatively stable assembly relationship with the valve seat 200. In another embodiment of the present application, Figure 11As shown, the protective plate 620 may further include a circumferential connection portion 623. The circumferential connection portion 623 is disposed around the outer periphery of the shielding rib plate 622, and the outer edges of the shielding rib plates 622 are fixedly connected to the inner edge of the circumferential connection portion 623. In this case, the structural stability of the shielding rib plate 622 is relatively stronger, preventing the shielding rib plate 622 from being bent or broken during transportation or the like, and further improving the structural stability of the protective plate 620.

[0081] Of course, during the processing of the protective plate 620, the bridging portion 621, the shielding rib plate 622, and the circumferential connection portion 623 can be formed by an integral molding method, which can further improve the structural stability of the entire protective plate 620 and reduce the processing difficulty of the protective plate 620. Moreover, when the protective plate 620 includes the circumferential connection portion 623, the circumferential connection portion 623 can be used to mutually press against the groove side wall 232 of the receiving groove 230, so that the entire protective plate 620 can form an interference fit relationship with the receiving groove 230, ensuring a relatively reliable fixed assembly relationship between the protective plate 620 and the valve seat 200. Compared with directly pressing and fitting through the shielding rib plate 622 and the receiving groove 230, adopting the technical solution disclosed in the embodiment of the present application can prevent the shielding rib plate 622 from being bent and deformed or even broken during the pressing process with the receiving groove 230, thereby improving the service life and protection effect of the protective plate 620.

[0082] In addition, when the protective plate 620 includes the circumferential connection portion 623, the diameter and other dimensions of the receiving groove 230 can be appropriately increased so that the circumferential connection portion 623 does not block the first drainage channel 240. That is, in the embodiment of the present application, in the radial direction of the valve seat 200, the second port 241 of any first drainage channel 240 is spaced from the groove side wall 232 of the receiving groove 230. Among them, the radial direction of the valve seat 200 is perpendicular to the axial direction of the valve seat 200. Among them, the spacing dimension between the first drainage channel 240 and the groove side wall 232 of the receiving groove 230 can be determined according to parameters such as the radial dimension of the circumferential connection portion 623.

[0083] In order to further prevent the protective plate 620 from being deformed or even damaged due to extrusion during the installation process, in another embodiment of the present application, the valve seat 200 may include a separately formed seat body 200a and a liner ring 200b. Among them, the seat body 200a is provided with a sunk groove and a first seat end face 213, and the sunk groove includes the above-mentioned receiving groove 230. Specifically, in the hydraulic end disclosed in the embodiment of the present application, in addition to the receiving groove 230 being formed on the seat body, the outside of the receiving groove 230 is further hollowed out to provide accommodation for both the liner ring and the protective plate 620 by using the sunk groove. Of course, other structures such as the first drainage channel 240 are also provided on the seat body.

[0084] More specifically, the lining ring 200b is located on the side of the protective plate 620 facing away from the first seat end face 213. The side of the lining ring 200b facing away from the protective plate 620 has the above-mentioned second mating concave surface 252, so that the valve seat 200 can still cooperate with the discharge valve assembly by using the second mating concave surface 252 on the lining ring 200b. At the same time, the lining ring 200b is in interference fit with the receiving groove 230 to axially position the protective plate 620 and the valve seat 200. The lining ring 200b is a ring structure, and the inner diameter size of the lining ring can be appropriately increased according to actual needs to ensure that the lining ring does not interfere with or hinder the liquid discharge process of the valve seat 200.

[0085] In the embodiment of the present application, the lining ring 200b is used to provide a positioning function for the protective plate 620. Furthermore, the radial dimension of the protective plate 620 can be slightly smaller than the radial dimension of the receiving groove 230, ensuring that the protective plate 620 will not be squeezed against the valve seat 200 during installation, and thus ensuring that the protective plate 620 has high structural stability and service life. Correspondingly, the radial dimension of the lining ring 200b can be designed so that the lining ring 200b can form an interference fit relationship with the receiving groove 230 during installation in the receiving groove 230, ensuring that the lining ring can provide a good positioning function for the protective plate 620.

[0086] It should be noted that the above-mentioned receiving groove 230, protective plate 620, and lining ring 200b are not necessarily circular structures. The above-mentioned radial dimensions are only for facilitating the description of the shapes and assembly relationships of the above structures. In other embodiments of the present application, the structures such as the receiving groove 230, protective plate 620, and lining ring 200b can also be rectangular or other irregular shapes. Of course, for ease of processing and to improve the protection comprehensiveness of the protective plate 620 as much as possible, the receiving groove 230, protective plate 620, and lining ring 200b can all be circular or approximately circular structures.

[0087] In the hydraulic end, when a backing ring 200b is provided on one side of the protective plate 620 facing away from the first seat end face 213 of the valve seat 200, the structure directly cooperating with the liquid discharge valve assembly 310b can still be the valve seat 200. In this case, it may cause the radial dimension of the valve seat 200 to be too large, which is not conducive to the miniaturization of the pump. Or, it may cause the radial dimension of the backing ring 200b to be too small, resulting in a reduced positioning effect of the backing ring 200b. To address the foregoing problems, in another embodiment of the present application, the backing ring 200b can be directly engaged with the liquid discharge valve assembly 310b. And in order to increase the fitting area between the backing ring 200b and the valve body of the liquid discharge valve assembly 310b, a second mating concave surface 252 can be provided on the side of the backing ring 200b facing away from the protective plate 620. The second mating concave surface 252 is recessed relative to the second seat end face 214, so that the second mating concave surface 252 can fit with the valve body (and valve rubber) of the liquid discharge valve assembly 310b, and during the liquid inlet process, the liquid discharge valve assembly 310b is sealingly engaged with the second mating concave surface 252 of the backing ring 200b.

[0088] In addition, when the liquid discharge pressure of the hydraulic end is not too high, the above-mentioned protective plate 620 may not be provided on the liquid discharge side of the valve seat. In this case, as Figure 20 and Figure 21 shown, the first liquid discharge channel 240 provided on the valve seat 200 can extend from the first seat end face 213 to the second mating concave surface 252, so as to increase the fitting area between the valve seat 200 and the liquid discharge valve assembly under the action of the second mating concave surface 252 and improve the stability of the sealing relationship between the two.

[0089] Based on the hydraulic end disclosed in any of the above embodiments, as ​ shown, an embodiment of the present application further discloses a pump, which includes any of the above hydraulic ends. Of course, the pump usually may further include other mechanisms such as a power end 900 and a speed reduction mechanism. For the sake of brevity of the text, they will not be introduced one by one here.

[0090] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them fall within the protection scope of the present application.

Claims

1. A hydraulic end, characterized in that, The hydraulic end includes a valve seat (200), a valve box (100), a first seal (611) and a second seal (612). The valve seat (200) is provided with a first annular groove (216) and a first liquid inlet channel (220). The first annular groove (216) is located on the outer peripheral surface of the valve seat (200). The valve box (100) is provided with an installation cavity (110) and a second liquid inlet channel (171). The cavity wall of the installation cavity (110) is provided with a second annular groove (112). The valve seat (200) is installed in the installation cavity (110), and the first liquid inlet channel (220) communicates with the second liquid inlet channel (171). The first port (221) of the first liquid inlet channel (220) extends to the side surface (215) of the valve seat (200). Axially of the valve seat (200), the first port (221) is located between the first annular groove (216) and the second annular groove (112). The first seal (611) is installed in the first annular groove (216), and the second seal (612) is installed in the second annular groove (112). Both the first seal (611) and the second seal (612) are in sealing cooperation with the valve seat (200) and the valve box (100).

2. The hydraulic end according to claim 1, wherein The number of the first liquid inlet channels (220) is multiple. The first ports (221) of the multiple first liquid inlet channels (220) are all located on the side surface (215) of the valve seat (200), and the multiple first ports (221) are circumferentially spaced apart along the side surface (215).

3. The hydraulic end according to claim 1, characterized in that, The valve seat (200) is provided with a first liquid discharge channel (240). The two axially opposite ends of the valve seat (200) are connected through the first liquid discharge channel (240), and the first liquid discharge channel (240) does not intersect with the first liquid inlet channel (220).

4. The hydraulic end according to claim 3, characterized in that, The number of the first liquid discharge channels (240) is multiple, and the multiple first liquid discharge channels (240) are circumferentially spaced apart along the side surface (215).

5. The hydraulic end according to claim 1, characterized in that, The valve seat (200) has a first seat end face (213) and a second seat end face (214). Axially of the valve seat, the first seat end face (213) and the second seat end face (214) are located at the two opposite ends of the valve seat (200), and the first seat end face (213) and the second seat end face (214) are connected to each other through the side surface (215). The valve seat (200) has a first mating concave surface (251), and the first mating concave surface (251) is recessed relative to the first seat end face (213).

6. The hydraulic end according to claim 5, characterized in that, The axis of the first mating concave surface (251) is collinear with the axis of the side surface (215).

7. The hydraulic end according to claim 1, wherein The valve seat (200) has a first seat end face (213) and a second seat end face (214). Axially of the valve seat, the first seat end face (213) and the second seat end face (214) are located at opposite ends of the valve seat (200), and the first seat end face (213) and the second seat end face (214) are connected to each other through the side face (215). The valve seat (200) has a second mating concave surface (252), and the second mating concave surface (252) is recessed relative to the second seat end face (214).

8. The hydraulic end according to claim 7, characterized in that, The axis of the second mating concave surface (252) is collinear with the axis of the side face (215).

9. The hydraulic end according to claim 1, characterized in that, The hydraulic end further includes an adapter plate (710). The number of valve boxes (100) is multiple, and the multiple valve boxes (100) are distributed along the length direction of the adapter plate (710) and are fixedly connected to the adapter plate (710).

10. A pump, characterized in that, It includes the hydraulic end according to any one of claims 1-9.

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