Valve seat, fluid end and pump

Abstract

The invention discloses a valve seat, a fluid end and a pump, and belongs to the technical field of oil gas and mining, the valve seat is provided with a first seat end face, a second seat end face and a connecting side face, in the axial direction of the valve seat, the first seat end face and the second seat end face are located at the two opposite ends of the valve seat and are connected through the connecting side face, and the first seat end face and the second seat end face are connected through the connecting side face. The valve seat is provided with a first liquid inlet channel, and a first port of the first liquid inlet channel is located in the connecting side face. The connecting side face comprises a first sealing ring face and a second sealing ring face, the first sealing ring face is located between the first port and the first seat end face, the second sealing ring face is located between the first port and the second seat end face, the axis of the first sealing ring face is a first axis, and the axis of the second sealing ring face is a second axis. The axis of the second sealing ring face is a second axis, and the first axis and the second axis are arranged in a non-collinear mode. The valve seat can solve the problem that the sealing relation between an existing valve seat and a valve box is prone to losing efficacy.

Description

Technical Field

[0001] This application belongs to the technical field of oil and gas and mining, and particularly relates to a valve seat, a hydraulic end, and a pump. Background Art

[0002] A pump is a commonly used device in the process of oil and gas extraction. A pump usually includes a power end and a hydraulic end. The power end can transmit power to the hydraulic end to complete the work of sucking and discharging liquid. In current pumps, the hydraulic 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. Along the axial direction of the valve seat, sealing rings are provided at both opposite ends of the valve seat, so that each sealing ring is axially pressed between the valve seat and the valve box to provide a sealing effect for the valve seat and the valve box.

[0003] However, during the operation of the hydraulic end, affected by the liquid flow, along the axial direction of the valve seat, the valve seat may move slightly relative to the valve box, and furthermore, 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 hydraulic end. Summary of the Invention

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

[0005] In a first aspect, the embodiments of this application disclose a valve seat. The valve seat has a first seat end face, a second seat end face, and a connecting side face. Along the axial direction of the valve seat, the first seat end face and the second seat end face are located at opposite ends of the valve seat, and the two are connected to each other through the connecting side face. The valve seat is provided with a first liquid inlet channel, and a first port of the first liquid inlet channel is located on the connecting side face; The connecting side face includes a first sealing ring face and a second sealing ring face. The first sealing ring face is located between the first port and the first seat end face, and the second sealing ring face is located between the first port and the second seat end face. The axis of the first sealing ring face is the first axis, and the axis of the second sealing ring face is the second axis. The first axis and the second axis are non-collinear.

[0006] In a second aspect, the embodiments of this application disclose a hydraulic end, which includes a valve box and the above-mentioned valve seat. The valve box is provided with a second liquid inlet channel. The valve seat is installed in the valve box, and the first liquid inlet channel is communicated with the second liquid inlet channel.

[0007] In a third aspect, the embodiments of this application disclose a pump, which includes the above-mentioned hydraulic end.

[0008] An embodiment of the present application discloses a valve seat, which can cooperate with a valve box and be applied to the hydraulic end of a pump. The first seat end face and the second seat end face of the valve seat are located at opposite ends of the valve seat along its own axis, and the first seat end face and the second seat end face are connected to each other through a connecting side face. The first port of the first liquid inlet channel of the valve seat extends and is located on the connecting side face, so that the first liquid inlet channel of the valve seat can communicate with a corresponding second liquid inlet channel on the valve box.

[0009] In order to ensure that while the first liquid inlet channel communicates with the second liquid inlet channel, the second liquid inlet channel and the second liquid discharge channel on the valve box can be kept isolated from each other. In the valve seat disclosed in the embodiment of the present application, the connecting side face includes a first sealing ring face and a second sealing ring face. The first sealing ring face is located between the first port and the first seat end face, and the second sealing ring face is located between the first port and the second seat end face. 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 space enclosed by the first sealing ring face and the second sealing ring face. Under the action of the sealing effect provided by the first sealing ring face and the second sealing ring face, 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.

[0010] At the same time, since both the first sealing ring face and the second sealing ring face are located on the outer peripheral side of the valve seat, during the operation 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, and it is also ensured that the sealing reliability between the valve seat and the valve box is always relatively high. And, by setting the first axis of the first sealing ring face and the second axis of the second sealing ring face to be non-collinear, and making corresponding settings for the corresponding part in the installation cavity of the valve box, after the valve seat is installed in the installation cavity of the valve box, the valve seat cannot rotate relative to the valve box, which can further improve the reliability of the sealing cooperation relationship between the valve seat and the valve box, and can also design parameters such as the installation angle of the valve seat, so that after the valve seat is installed in the valve box, the first liquid inlet channel can be set opposite to the second liquid inlet channel to improve the liquid inlet efficiency of the valve seat, and then improve the working efficiency of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] 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 is a schematic cross-sectional view of the valve seat disclosed in the embodiment of the present application; Figure 2 is a schematic cross-sectional view of the valve seat disclosed in the embodiment of the present application in another direction; Figure 3 Structural schematic diagram of the valve seat disclosed in the embodiment of the present application; Figure 4 Structural schematic diagram of the valve seat in another angle disclosed in the embodiment of the present application; 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 [[ID= (49)]]Structural schematic diagram of the hydraulic end in another angle disclosed in the embodiment of the present application; Figure 18 One 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 22Schematic structural diagram of the pump disclosed in the embodiments of the present application.

[0012] 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 - current collector, 721 - current collection 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

[0013] 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 of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without making creative efforts shall fall within the protection scope of the present application.

[0014] As Figures 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, 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.

[0015] 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 outlet 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 basis 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 outlet channel. And, during the working process of the hydraulic end, the valve seat 200 can make the hydraulic end alternately perform the liquid inlet process and the liquid outlet process by cooperating with the corresponding check valve. For this reason, the valve seat 200 is also provided with a liquid inlet channel and a liquid outlet 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 outlet channel provided on the valve seat 200 is the first liquid outlet channel 240, and the liquid outlet channel provided on the valve box 100 is the second liquid outlet 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 outlet channel 240 is communicated with the second liquid outlet channel 161.

[0016] 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 in the connecting side face 215, or even a certain ring area 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. At the same time, this direction X can also be denoted as the first direction.

[0017] To prevent stress concentration at the intersection of the second liquid inlet passage 171 and the second liquid discharge passage 161 of the valve box 100 due to their mutual intersection, in the embodiment of the present application, the second liquid inlet passage 171 and the second liquid discharge passage 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 liquid 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 components. Among them, the valve component provided at one end of the valve seat 200 is the liquid inlet valve component 310a, and the valve component provided at the other end of the valve seat 200 is the liquid discharge valve component 310b. Correspondingly, the second liquid inlet passage 171 of the valve box 100 is arranged at a position corresponding to or adjacent to the liquid inlet valve component 310a, and the second liquid discharge passage 161 of the valve box 100 is arranged at a position corresponding to or adjacent to the liquid discharge valve component 310b. As described above, since the liquid inlet valve component 310a and the liquid discharge valve component 310b are distributed along the axial direction of the valve seat 200, and there is also a valve seat 200 between them, further making the second liquid inlet passage 171 and the second liquid discharge passage 161 on the valve box 100 have a certain dimensional interval in the above axial direction, which can ensure that the second liquid inlet passage 171 and the second liquid discharge passage 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.

[0018] As above, the valve seat 200 is provided with a first liquid inlet passage 220, the valve box 100 is provided with a second liquid inlet passage 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. Furthermore, in order to ensure that the first liquid inlet passage 220 can communicate with the second liquid inlet passage 171, in the embodiment of the present application, the first port 221 of the first liquid inlet passage 220 is located on the connection side surface 215. That is, the first port 221 of the first liquid inlet passage 220 extends to the connection side surface 215 of the valve seat 200 to ensure that the first liquid inlet passage 220 can communicate with the second liquid inlet passage 171 provided on the outer periphery of the installation cavity 110 of the valve box.

[0019] For the other end port of the first liquid inlet passage 220 of the valve seat 200, it can extend to the position where the liquid inlet valve component 310a is located, so that the liquid entering the valve box 100 through the second liquid inlet passage 171 can enter the area where the liquid inlet valve component 310a is located through the first liquid inlet passage 220.

[0020] 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 with each other, 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 stress concentration problems of 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 also have no cross intersection line due to the mutual 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.

[0021] Moreover, a second liquid discharge channel 161 is provided at a position on 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 171 and discharged through the second liquid discharge channel 161.

[0022] 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.

[0023] 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, 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 400 is connected to the power end 900 through the clamp 350.

[0024] 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 and separately, 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, it is ensured that 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.

[0025] 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, so that the liquids in the second liquid inlet channel 171 and the second liquid discharge channel 161 will not be directly exchanged. However, during the operation of the pump, driven by the flow of the liquid, 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.

[0026] 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 the two cooperate with structures such as sealing rings to produce a sealing effect.

[0027] More specifically, the first sealing ring surface 211 and the second sealing ring surface 212 are respectively fitted with the sealing ring to form a sealing fit 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 channel 171 can only communicate with the first liquid inlet channel 220 through the aforementioned sealed space, and the second liquid discharge channel 161 is located outside the aforementioned sealed space, ensuring that the second liquid inlet channel 171 and the second liquid discharge channel 161 are isolated from each other.

[0028] As described above, in the axial direction of the valve seat 200, the first liquid discharge channel 240 penetrates through the valve seat 200. Therefore, among the opposite two end ports of the first liquid discharge channel 240, one is located on the side of the first sealing member 611 away from the second sealing member 612, and the other is located on the side of the second sealing member 612 away from the first sealing member 611. This can ensure that the second liquid discharge channel 161 is entirely located outside the aforementioned sealed space, enabling the second liquid inlet channel 171 to form a good isolation relationship with the second liquid discharge channel 161.

[0029] 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 effect 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 shakes slightly relative to the valve box, 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 fit relationship between the valve seat 200 and the valve box 100 is always relatively stable.

[0030] It should be noted that both the first sealing ring surface 211 and the second sealing ring surface 212 are closed annular 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 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.

[0031] In order to further improve the sealing reliability of the first seal 611 and the second seal 612, during the processing 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.

[0032] In order to reduce the processing 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.

[0033] 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.

[0034] 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 and the valve seat 200, the first seal 611 can be pre-installed in the first annular groove 2l6, and the second seal 612 can be installed in the second annular groove. After that, the valve seat 200 can be gradually pushed into the installation cavity 110 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 a squeezing 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.

[0035] In order to prevent the excessive annular grooves from having a greater adverse impact on the structural strength of the corresponding devices, 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 200, and the other is provided on the valve box 100. For example, the valve seat 200 is provided with the first annular groove 216, and the cavity wall of the installation cavity 110 of the valve box 100 is provided with the second annular groove. Correspondingly, in the axial direction of the valve seat l00, the first port 221 of the first liquid inlet channel 220 is located between the first annular groove 216 and the second annular groove.

[0036] 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.

[0037] Specifically, by designing the dimensions such as the diameter 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, in the direction perpendicular to the axial direction of the valve seat 200, the distance between the first sealing ring surface 211 and the corresponding area in the installation cavity 110, and the distance 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.

[0038] In addition, in the case of adopting the above technical solution, the valve seat 200 can be correspondingly installed according to the setting 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 directly 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 directly opposite state between the first liquid inlet channel 220 and the second liquid inlet channel 171 can be continuously maintained, thereby making the liquid flow more efficiently between the second liquid inlet channel 171 and the first liquid inlet channel 220, achieving the purpose of improving the liquid inlet efficiency.

[0039] The embodiment of the present application discloses a valve seat 200, which can cooperate with a valve box 100 to be applied to the hydraulic end of a pump. The first seat end surface 213 and the second seat end surface 214 of the valve seat 200 are located at opposite ends of the valve seat 200 along its own axial direction, and the first seat end surface 213 and the second seat end surface 214 are connected to each other through a connecting side surface 215. The first port 221 of the first liquid inlet channel 220 of the valve seat 200 extends and is located on the connecting 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.

[0040] In order 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 valve seat 200 disclosed in the embodiment of the present application, the connecting side surface 215 includes a first sealing ring surface 211 and a second sealing ring surface 212. 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. 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 outside the space enclosed by the first sealing ring surface 211 and the second sealing ring surface 212. Under the sealing effect provided by the first sealing ring surface 211 and the second sealing ring surface 212, 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.

[0041] Meanwhile, since both the first sealing ring surface 211 and the second sealing ring surface 212 are located on the outer peripheral side of the valve seat 200, during the working process of the valve seat 200, even if the valve seat 200 slightly shakes 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. And, by arranging the first axis 211a of the first sealing ring surface 211 and the second axis 212a of the second sealing ring surface 212 non-collinearly, and making corresponding settings for the corresponding part 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 100, which can further improve the reliability of the sealing cooperation relationship between the valve seat 200 and the valve box 100, and also can, by designing parameters such as the installation angle of the valve seat 200, make the first liquid inlet channel 220 be arranged opposite to the second liquid inlet channel 171 after the valve seat 200 is installed in the valve box 100, so as to improve the liquid inlet efficiency of the valve seat 200 and further improve the working efficiency of the pump.

[0042] In the above embodiment, 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, such as Figure 18As shown, it is also possible to arrange the axes at any position in the installation cavity 110 of the valve box 100 to be collinear. In this case, it is also possible to design parameters such as the distance between the first axis 211a and the second axis 212a of the valve seat 200, so that after the valve seat 200 is installed in the valve box 100, it is still unable to 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 greatly 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 order to further improve the liquid inlet efficiency of the valve seat 200, in other embodiments of the present application, 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 connection side surface 215. More specifically, the first ports 221 of the multiple first liquid inlet channels 220 can be distributed at intervals along the circumferential direction of the connection side surface 215.

[0044] As described above, the second liquid inlet channel 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 channels 220 on the valve seat 200 is multiple, the number of the second liquid inlet channels 171 on the valve box 100 can also be multiple, and at least one second liquid inlet channel 171 is correspondingly provided for any first liquid inlet channel 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 installation cavity 110 in the valve box 100 can correspondingly be provided with one or two second liquid inlet channels 171.

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

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

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

[0048] In addition, when the number of the second liquid inlet channels 171 is multiple, the multiple second liquid inlet channels 171 can also be uniformly arranged along the direction around the axis of the valve seat 200. For example, when the valve seat 200 is in a cubic structure as a whole, in a specific embodiment of the present application, a second liquid inlet channel 171 can be arranged above and below any installation cavity 110, where the distribution directions of the above and below are specifically the second direction, that is, Figure 16 the direction Y in. Of course, when there are other requirements, a second liquid inlet channel 171 can be arranged only 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 can also ensure to a certain extent that one second liquid inlet channel 171 can supply liquid to the multiple 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 be inclined relative to the second direction. Of course, in order to improve the liquid inlet efficiency of the second liquid inlet channels 171 corresponding to the multiple 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] To improve the liquid drainage efficiency of the valve seat 200, similarly, the number of the first liquid drainage channels 240 can also be multiple, and the multiple first liquid drainage channels 240 are circumferentially spaced along the connecting side surface 215. Optionally, the first liquid drainage channel 240 is a curved extension structure. 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 assembly 310a and the liquid drainage valve assembly 310b on the opposite sides of the valve seat 200. For this purpose, in a specific embodiment of the present application, the first liquid drainage channel 240 can be extended along the axial direction of the valve seat 200, that is, the extension directions of the multiple first liquid drainage channels 240 are parallel to each other and are parallel to the straight line where the axial direction of the valve seat 200 is located.

[0050] To improve the space utilization rate of the valve seat 200, in another embodiment of the present application, the extension direction of the first liquid drainage channel 240 can also be inclined relative to the axial direction of the valve seat 200. In this case, the extension directions of the multiple first liquid drainage channels 240 may no longer be parallel to each other, but overall, the multiple first liquid drainage channels 240 can still be circumferentially spaced along the direction around the axial direction of the valve seat 200. Of course, when the numbers of the first liquid inlet channels 220 and the first liquid drainage channels 240 are both multiple, any first liquid inlet channel 220 and any first liquid drainage channel 240 do not intersect, so as to ensure that no cross intersection line is generated on the valve seat 200 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 drainage valve assembly 310b are respectively provided outside the opposite ends of the valve seat 200. To improve the liquid holding capacity of the areas 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, such that the plunger 400 can suck the liquid in the second liquid inlet channel 171, so that the liquid flows along the second liquid inlet channel 171 and only through the first liquid inlet channel 220 to the area 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, such that the plunger 400 can apply a pushing force to the liquid located in the area where the liquid inlet valve assembly 310a is located, thereby driving the liquid to flow through the first liquid discharge channel 240 to the area where the liquid discharge valve assembly 310b is located, opening the liquid discharge valve assembly 310b, and discharging the liquid through the second liquid discharge channel 161 outside the valve box 100.

[0053] Optionally, the axis of the first mating concave surface 251 is not collinear with the first axis 211a. For example, there may be an angle greater than 0° and less than 90° between the two. Alternatively, in another embodiment of the present application, the axis of the first mating concave surface 251 may 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 mating accuracy between the valve assembly mating with the first mating concave surface 251 and the valve seat 200, and 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 mating concave surface 251 may be collinear with the axis of the first sealing ring surface 211 (i.e., the first axis 211a) to improve the liquid exchange efficiency.

[0055] Furthermore, a mating concave surface may also be provided on one side of the second seat end surface 214 in the valve seat 200. This mating concave surface is specifically the second mating concave surface 252, and the second mating concave surface 252 is recessed relative to the second seat end surface 214, such that the valve seat 200 can increase the volume of the area where the corresponding valve assembly is located through the second mating concave surface 252, and can also improve the mating stability between the valve seat 200 and the valve assembly on the side where the second mating concave surface 252 is located to a certain extent.

[0056] Similarly, the axis of the second mating concave surface 252 may also be non-collinear 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 mating concave surface 252 may be collinear with the second axis 212a.

[0057] When a first mating concave surface 251 and a second mating 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 mating concave surface 251. In this case, a cavity can be provided at a position where the central region of the valve seat 200 is close to the first mating concave surface 251, so that one end ports of the multiple first liquid inlet channels 220 can all communicate with the cavity. At the same time, the cavities all communicate with the first mating concave surface 251, so as to communicate the cavity with the region where the liquid inlet valve assembly 310a is located when the liquid inlet valve assembly 310a is opened, thereby further improving the liquid inlet efficiency.

[0058] At the same time, one end ports of the multiple second liquid inlet channels 171 can all extend to the first seat end surface 213. Since the cavity is provided on the side of the central region of the valve seat 200 close to the first mating concave surface 251, the ports of the multiple second liquid inlet channels 171 can be located in a relatively outer region of the first seat end surface 213, which makes the dispersion between the first liquid inlet channels 220 and the first liquid discharge channels 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. And, each first liquid discharge channel 240 can extend obliquely relative to the axis of the valve seat 200, so that the other end ports (denoted as second ports 241) of the first liquid discharge channels 240 can all 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.

[0059] Based on the valve seat 200 disclosed in any one of the above embodiments, the embodiment of the present application also 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 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 can also include the first sealing member 611 and the second sealing member 612 used to provide a sealing effect for the valve seat 200 and the valve box 100. In addition, the hydraulic end can also include a liquid inlet valve assembly 310a and a liquid discharge valve assembly 310b.

[0060] 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. Thus, the valve seat 200 can be first installed in one of the structural parts, and then the two structural parts are fixedly connected to ensure that the valve seat 200 can be installed in the installation cavity 110.

[0061] To improve the structural reliability of the valve box 100 and enhance its sealing performance, in another embodiment of the present application, the installation cavity 110 penetrates through the valve box 100 along the axial direction 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.

[0062] Of course, after the valve seat 200 is installed in the installation cavity 110, to ensure that the installation cavity 110 can still form a closed environment, the hydraulic end may further include structural parts 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 between the two.

[0063] As described above, the valve box 100 is provided with an installation cavity 110, and devices such as the valve seat 200 are installed in the installation cavity 110. 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 multiple installation cavities 110, and devices such as the valve seat 200, the liquid inlet valve assembly 310a, and the liquid discharge valve assembly 310b can be installed in any installation cavity 110.

[0064] In order to make the valve box 100 more applicable, in the hydraulic end disclosed in another embodiment of the application, the number of valve boxes 100 is multiple. Correspondingly, each valve box 100 is provided with a corresponding 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 can be one or more, and this is not limited in this article. In a specific embodiment of the present application, if the hydraulic end includes multiple valve boxes 100, each valve box 100 can be provided with only one installation cavity 110, and the specific number of valve boxes 100 required for the hydraulic end can be flexibly selected according to the actual situation of the on-site working conditions.

[0065] At the same time, in order to facilitate the assembly work between multiple valve boxes 100, in the embodiment of the present application, the hydraulic end further includes an adapter plate 710. Multiple valve boxes can be distributed along the length direction of the adapter plate 710 and are fixedly connected to the adapter plate 710. That is to say, 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 multiple valve boxes, so that multiple valve boxes 100 can form a relatively fixed relationship through the adapter plate 710, thereby reducing the assembly difficulty of multiple valve boxes 100.

[0066] Specifically, the adapter plate 710 can be formed of a material with relatively high structural strength such as metal. The adapter plate 710 is usually a rectangular plate-like structural member, and its dimensions such as length, width and thickness can be flexibly selected according to actual needs. 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 relationship with the threaded holes on the valve box 100. Considering that the weight and other parameters of devices such as the valve box 100 are relatively large and the vibration generated during the working process is relatively intense, 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. By installing a connecting nut at the end of the connecting bolt away 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 adapter plate 710 can be used to form a fixed connection relationship between the valve box 100 and the power end 900 indirectly in a way that the adapter plate 710 is connected to the power end 900.

[0067] As described above, when there are multiple installation cavities 110 provided at the hydraulic end, each installation cavity 110 needs to be correspondingly provided with a second liquid inlet passage 171 and a second liquid discharge passage 161. To facilitate the interconnection between the hydraulic end and the external pipeline, the multiple second liquid inlet passages 171 and the multiple second liquid discharge passages 161 provided on the hydraulic end can be relatively regularly distributed. For example, the second liquid inlet passages 171 can be correspondingly provided directly above each installation cavity 110, which enables the multiple second liquid inlet passages 171 to be arranged at intervals along the distribution direction of the multiple installation cavities 110. In this case, the inlet manifold 730 can be connected to the multiple second liquid inlet passages 171 simultaneously, so that the sucked liquid can be transported to the multiple second liquid inlet passages 171 through the inlet manifold 730 together. Of course, another second liquid inlet passage 171 can be further provided below each installation cavity 110, and the multiple second liquid inlet passages 171 located below the installation cavities 110 can also be interconnected through another inlet manifold 730 to improve the liquid inlet efficiency and the space utilization rate of the valve box 100.

[0068] 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, the multiple installation cavities 110 can be arranged in a straight line direction, and in the extending direction of the installation cavity 110, that is, the axial direction of the valve seat 200, the opposite ends of the multiple installation cavities 110 can be arranged flush. As Figure 16 and Figure 18 shown, in a specific embodiment of the present application, any valve box 100 can be provided with one or more installation cavities 110, and each installation cavity 110 penetrates the valve box 100 along the axial direction of the valve seat 200, and the multiple installation cavities 110 are distributed in a direction perpendicular to the axial direction of the valve seat 200. Specifically, the distribution direction of the multiple installation cavities 110 can be the third direction, and in the embodiment of the present application, the third direction can 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 are perpendicular to each other, which can maximize the regularity of the external shape 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 regularity of the external shape 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 can be the Figure 16 direction Z in

[0069] Similarly, for the second drain channels 161 corresponding to the respective plurality of mounting cavities 110, they can also be regularly distributed. Optionally, in a specific embodiment of the present application, the second drain channels 161 can be provided at another position above each mounting cavity 110, and the plurality of second drain channels 161 are also arranged at intervals along the distribution direction of the plurality of mounting cavities 110 as a whole. Based on this, in the hydraulic end disclosed in the embodiments of the present application, a manifold 720 can also be included. The manifold 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 720.

[0070] Meanwhile, in order to facilitate the transportation of the liquid in the manifold 720, in the embodiments of the present application, a drain port can be provided at one end of the manifold cavity 721, and by using a fastener 520, a discharge flange 320 can be installed at the drain port. The discharge flange 320 can communicate with a corresponding flexible or rigid pipe assembly to pump the liquid to the required position. Additionally, a tee 360 can be provided at the other end of the manifold cavity 721 to further improve the convenience of controlling the liquid transportation path.

[0071] As described above, during the operation of the pump, affected by the driving action of the liquid flow, the valve seat 200 may slightly shake or move relative to the valve box 100. Furthermore, in order to improve the service life of the valve seat 200, in a specific embodiment of the present application, the hydraulic end can also 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 inner wall of the mounting 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, the first sealing ring surface 211 can be provided with a first annular groove 216, and the inner wall of the mounting cavity 110 can be provided with another annular groove 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.

[0072] As described above, a liquid inlet valve assembly 310a and a liquid discharge valve assembly 310b are respectively provided at 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 liquid in the second liquid inlet channel 171 and the first liquid inlet channel 220 has a relatively slow flow rate 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, which makes the pressure and flow rate of the liquid in the area where the liquid discharge valve assembly 310b is located relatively high when it is discharged out 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, for this reason, 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.

[0073] For this reason, if the valve rubber sheet is damaged, the liquid flowing into the second liquid discharge channel 161 will invade the valve rubber sheet and flow at a 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), which easily leads to the damage of the valve seat 200 and causes the high-pressure chamber HP where the second liquid discharge channel 161 is located to communicate with the low-pressure chamber LP where the second liquid inlet channel 171 is located, and further causes the high and low pressure chambers to have pressure cross-leakage, resulting in the bursting of the pipe manifold and seriously affecting the personal safety of the staff.

[0074] For this reason, 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 where the valve rubber sheet of the discharge valve assembly is damaged. Of course, since the second port 241 of the first liquid discharge 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 liquid discharge work of the first liquid discharge channel 240, the protective plate 620 needs to be provided with a structure such as an avoidance opening to avoid the first liquid discharge channel 240.

[0075] Meanwhile, in order to ensure that the valve seat 200 and the drain 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 drain valve assembly 310b, at least one of the valve body of the drain 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, for this reason, in order to prevent the setting of the receiving groove 230 from having a greater adverse impact on the structural strength of the valve body, 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 described 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 through the receiving groove 230 to the area where the drain valve assembly 310b is located, and finally is discharged outside the valve box 100 through the second drain channel 161.

[0076] 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 outside of the bridging portion 621. That is, in the hydraulic end disclosed in the embodiment of the present application, the bridging portion 621 is used to provide an assembling function for the shielding rib plate 622. Of course, when the number of the shielding rib plates 622 is one, there may be no obvious boundary between the bridging portion 62 and the shielding rib plate 622 in terms of structure, and when the number of the shielding rib plates 622 is multiple, the portion located at the center of the multiple shielding rib plates 622 can be the bridging portion 621.

[0077] After the protection plate 620 is installed in the accommodation groove 230, the main component providing 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 connection side 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 shielding rib plates 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°, the angle spanned by the shielding rib plate 622 can be 270°. In addition, in the above embodiment, multiple first liquid discharge channels 240 can be provided on the valve seat 200. In this case, the number of shielding rib plates 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.

[0078] Specifically, the protection plate 620 can be formed of a metal material. In order to further improve the protection effect of the protection plate 620, in another embodiment of the present application, the hardness of the protection plate 620 can be greater than the hardness of the valve seat 200, and / or the wear resistance of the protection plate 620 can be greater than the wear resistance of the valve seat 200. In this case, the service life of the protection plate 620 can be further improved to further enhance the protection effect of the protection plate 620 on the valve seat 200. More specifically, in a specific embodiment of the present application, the forming material of the protection 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 protection plate 620 to have relatively high strength and wear resistance while having relatively low cost and relatively low processing difficulty.

[0079] As described above, the bridging portion 621 is located in the central region of the shielding rib plate 622. Optionally, the bridging portion 621 is a plate-shaped structure without holes, that is, the opposite sides of the bridging portion 621 cannot communicate with each other. Since the mating surface between the valve body in the drain valve assembly 310b and the valve seat 200 cannot directly extend to the central position of the valve seat 200, in another embodiment of the present application, a through hole 621a may be provided in the center of the bridging portion 621. The presence of the through hole 621a will not cause a significant lack of shielding integrity of the protective plate 620. The through hole 621a may be a circular hole and is provided through the bridging portion 621 along the thickness direction of the bridging portion 621. In this case, on the one hand, it facilitates the processing and transportation of the entire protective plate 620, and on the other hand, it can reduce the weight of the entire protective plate 620, so that the weight of the entire hydraulic end is also appropriately reduced.

[0080] In addition, in the above embodiment, the valve seat 200 may further be provided with a second mating concave surface 252, which is recessed relative to the second seat end surface 214. The valve body of the drain valve assembly 310b may be fitted with the second mating concave surface 252, and in the case where the valve seat 200 is provided with a receiving groove 230, the second mating concave surface 252 is connected between the second seat end surface 214 and the receiving groove 230. Therefore, 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 receiving groove 230 is located, it can face the shielding rib plate 622 of the protective plate 620. Thus, when the valve rubber of the drain valve assembly 310b is damaged and the liquid in the high-pressure chamber erodes along the second mating concave surface 252 towards the position where the receiving 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 plate 622 of the protective plate 620 is located, so as to further improve the service life of the valve seat 200 and enhance the safety of the entire pump.

[0081] As described above, the protective plate 620 can be installed in the receiving 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 installation difficulty of the protective plate 620 and minimize the number of blind holes or through holes and other structures 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 in interference fit with the receiving groove 230.

[0082] Specifically, the outer edge of the shielding rib plate 622 in the protective plate 620 that is away from the bridging portion 621 can be pressed against the inner wall of the receiving 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, as Figure 11As shown, the protective plate 620 can also 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 other processes, and further improving the structural stability of the protective plate 620.

[0083] 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 extrude with 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 extruding 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 extrusion process with the receiving groove 230, thereby improving the service life and protection effect of the protective plate 620.

[0084] 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 liquid discharge 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 liquid discharge channel 240 is spaced from the groove side wall 232 of the receiving groove 230. Herein, the radial direction of the valve seat 200 is perpendicular to the axial direction of the valve seat 200, and the spacing dimension between the first liquid discharge 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.

[0085] In order to further prevent the protective plate 620 from being deformed or even damaged due to extrusion during installation, in another embodiment of the present application, the valve seat 200 can 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 receiving groove 230. Specifically, in the hydraulic end disclosed in the embodiment of the present application, in addition to providing the receiving groove 230 on the seat body 200a, the outside of the receiving groove 230 is further hollowed out to use the sunk groove to provide accommodation for both the liner ring and the protective plate 620 at the same time. Of course, other structures such as the first liquid discharge channel are also provided on the seat body 200a.

[0086] More specifically, the lining ring 200b is located on the side of the protective plate 620 away from the first seat end face 213. The side of the lining ring 200b 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 obstruct the liquid discharge process of the valve seat 200.

[0087] 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 by the valve seat 200 during the installation process, 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 when the lining ring is installed in the receiving groove 230, an interference fit relationship can be formed with the receiving groove 230, ensuring that the lining ring 200b can provide a good positioning function for the protective plate 620.

[0088] 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 the convenience 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.

[0089] 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 cooperated 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 fitting concave surface 252 can be provided on the side of the backing ring 200b facing away from the protective plate 620. The second fitting concave surface 252 is recessed relative to the second seat end face 214, so that the second fitting concave surface 252 can be fitted 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 in sealing cooperation with the second fitting concave surface 252 of the backing ring 200b.

[0090] 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 fitting 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 fitting concave surface 252 and improve the stability of the sealing relationship between the two.

[0091] Based on the hydraulic end disclosed in any of the above embodiments, as Figure 22 shown, an embodiment of the present application also discloses a pump, which includes any of the above hydraulic ends. Of course, the pump usually can also 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.

[0092] 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 spirit 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 valve seat, characterized in that, The valve seat has a first seat end face (213), a second seat end face (214) and a connecting side face (215). 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, and the two are connected to each other through the connecting side face (215). The valve seat is provided with a first liquid inlet channel (220), and a first port (221) of the first liquid inlet channel (220) is located on the connecting side face (215). The connecting side face (215) includes a first sealing ring face (211) and a second sealing ring face (212). The first sealing ring face (211) is located between the first port (221) and the first seat end face (213), and the second sealing ring face (212) is located between the first port (221) and the second seat end face (214). An axis of the first sealing ring face (211) is a first axis (211a), and an axis of the second sealing ring face (212) is a second axis (212a). The first axis (211a) and the second axis (212a) are non-collinear.

2. The valve seat according to claim 1, characterized in that, The number of the first liquid inlet channels (220) is multiple. First ports (221) of the multiple first liquid inlet channels (220) are all located on the connecting side face (215), and the multiple first ports (221) are circumferentially spaced apart along the connecting side face (215).

3. The valve seat according to claim 1, wherein The valve seat is provided with a first liquid discharge channel (240). One side where the first seat end face (213) is located and one side where the second seat end face (214) is located are communicated 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 valve seat 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 connecting side face (215).

5. The valve seat according to claim 1, characterized in that, The valve seat 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 valve seat according to claim 1, characterized in that The valve seat has a second mating concave surface (252), and the second mating concave surface (252) is recessed relative to the second seat end face (214).

7. A hydraulic end, characterized in that, It includes a valve box (100) and the valve seat (200) according to any one of claims 1-6. The valve box (100) is provided with a second liquid inlet channel (171). The valve seat (200) is installed in the valve box (100), and the first liquid inlet channel (220) is communicated with the second liquid inlet channel (171).

8. The hydraulic end according to claim 7, wherein The liquid end further includes an adapter plate (710). The number of the valve boxes (100) is multiple. The multiple valve boxes (100) are distributed along the length direction of the adapter plate (710) and are all fixedly connected to the adapter plate (710).

9. The hydraulic end according to claim 7, wherein The hydraulic end further includes a wear ring (640). The wear ring (640) is sleeved outside the first sealing ring surface (211). The inner side of the wear ring (640) is sealingly connected to the first sealing ring surface (211), and the outer side of the wear ring (640) is sealingly connected to the valve box (100).

10. A pump, characterized in that, Comprising the hydraulic end according to any one of claims 7-9.

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