Valve box, fluid end and pump

Abstract

The invention discloses a valve box, a fluid end and a pump, and belongs to the technical field of oil gas and mine exploiting, the fluid end comprises the valve box, a valve seat, a valve assembly and a plunger, the valve box is provided with a mounting cavity, and in the first direction, the mounting cavity penetrates through the valve box; and the valve seat, the valve assembly and the plunger are mounted in the mounting cavity or the extension direction of the mounting cavity. According to the fluid end, the problem that in the prior art, due to the fact that a cross intersecting line exists in a valve box of the fluid end, the position corresponding to the valve box is prone to cracking in the working process, and normal work of the fluid end is greatly affected can be solved.

Description

Technical Field

[0001] The present application belongs to the field of oil, gas and mining technology, and specifically relates to a valve box, a hydraulic end and a pump. Background Art

[0002] Pumps are commonly used in oil and gas production. They typically consist of a power end and a hydraulic end. The power end transmits power to the hydraulic end to complete the suction and discharge operations. In current pumps, the hydraulic end includes a valve housing, which is equipped with a mounting chamber, a liquid inlet chamber, and a liquid discharge chamber. The two chambers typically extend perpendicularly to each other, and a plunger is mounted within the mounting chamber. The liquid inlet and discharge chambers are each equipped with a liquid inlet valve assembly and a liquid discharge valve assembly. As the plunger makes linear reciprocating motion relative to the valve housing, the two valve assemblies alternately open and close, completing the suction and discharge processes.

[0003] However, in the above-mentioned related technologies, since the liquid inlet chamber and the liquid discharge chamber intersect with each other, a cross intersection line is formed between the two. During the operation of the pump, the area where the liquid inlet chamber and the liquid discharge chamber intersect with each other is frequently impacted by high-pressure liquid, and due to its discontinuous shape, fatigue failure occurs easily in the aforementioned area, which in turn causes cracks in the corresponding position of the valve box, thereby having a greater impact on the normal operation of the hydraulic end. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a valve box, a hydraulic end and a pump to solve the problem in the related art that the valve box of the hydraulic end has a cross intersection line, which easily causes cracks at the corresponding position of the valve box during operation, thereby having a significant impact on the normal operation of the hydraulic end.

[0005] In a first aspect, the present application discloses a hydraulic end, which includes a valve box, a valve seat, a valve assembly and a plunger, wherein: The valve box is provided with an installation cavity. In a first direction, the installation cavity runs through the valve box. The installation cavity or the extension direction of the installation cavity is used to install the valve seat, the valve assembly and the plunger.

[0006] In a second aspect, an embodiment of the present application discloses a valve box, which is applied to a hydraulic end. The valve box is provided with an installation cavity. In a first direction, the installation cavity runs through the valve box. The installation cavity or the extension direction of the installation cavity is used to install a valve seat, a valve assembly and a plunger.

[0007] In a third aspect, an embodiment of the present application discloses a pump comprising the above-mentioned hydraulic end.

[0008] An embodiment of the present application discloses a hydraulic end, which includes a valve box, a valve seat, a valve assembly and a plunger, wherein the valve box is provided with an installation cavity, and in a first direction, the installation cavity penetrates the valve box. At the same time, in the embodiment of the present application, the installation cavity or the extension direction of the installation cavity is used to install the valve seat, the valve assembly and the plunger. That is, in the hydraulic end disclosed in the embodiment of the present application, the valve seat can provide a flow path for the liquid, and because the valve seat, the valve assembly and the plunger are all located in the extension direction of the installation cavity as a whole, the liquid filling and discharge processes in the hydraulic end can be affected by the position of the valve assembly.

[0009] In more detail, in the hydraulic end disclosed in the embodiment of the present application, the valve assembly includes a liquid inlet valve assembly and a liquid discharge valve assembly, which are opened during the liquid inlet process and the liquid discharge process, respectively. Conversely, the liquid inlet valve assembly and the liquid discharge valve assembly are closed during the liquid discharge process and the liquid inlet process, respectively. In the hydraulic end disclosed in the embodiment of the present application, the liquid inlet valve assembly and the liquid discharge valve assembly are respectively located at opposite ends of the valve seat, which ensures that the liquid inlet path and the liquid discharge path of the hydraulic end are necessarily located in the areas where the opposite ends of the valve seat are located. In this case, the second liquid inlet channel and the second liquid discharge channel in the valve box, which are used to provide liquid inlet and liquid discharge functions respectively, do not intersect with each other, so that the valve box of the hydraulic end disclosed in the embodiment of the present application no longer has a cross intersection line, which can improve the overall service life of the valve box. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 A schematic cross-sectional view of the hydraulic end disclosed in an embodiment of the present application; Figure 2 This is a schematic structural diagram of the hydraulic end disclosed in the embodiment of this application; Figure 3 This is a schematic structural diagram of the valve box in the hydraulic end disclosed in an embodiment of the present application; Figure 4 This is a schematic structural diagram of the valve box in the hydraulic end disclosed in an embodiment of the present application in another direction; Figure 5 This is a cross-sectional schematic diagram of the valve box in the hydraulic end disclosed in the embodiment of the present application; Figure 6 This is a cross-sectional schematic diagram of the valve box in the hydraulic end disclosed in an embodiment of the present application at another position; Figure 7 This is a schematic structural diagram of the hydraulic end protection plate disclosed in an embodiment of the present application; Figure 8 for Figure 7Schematic diagram of the assembly between the protective plate, the drain valve assembly and the valve seat; Figure 9 This is another structural schematic diagram of the protective plate in the hydraulic end disclosed in an embodiment of the present application; Figure 10 for Figure 9 Schematic diagram of the assembly between the protective plate, the drain valve assembly and the valve seat; Figure 11 This is a schematic structural diagram of the hydraulic end center liner ring disclosed in an embodiment of the present application; Figure 12 This is a cross-sectional schematic diagram of the liner ring in the hydraulic end disclosed in an embodiment of the present application; Figure 13 It is a schematic diagram of the assembly between the protective plate, lining ring, drain valve assembly and valve seat; Figure 14 This is another structural schematic diagram of the valve seat in the hydraulic end disclosed in the embodiment of the present application; Figure 15 This is another structural schematic diagram of the valve seat in the hydraulic end disclosed in the embodiment of the present application; Figure 16 for Figure 15 A schematic cross-sectional view of a valve seat is shown; Figure 17 This is a schematic diagram of the structure of the pump disclosed in the embodiment of this application; Figure 18 This is another structural schematic diagram of the pump disclosed in an embodiment of the present application.

[0011] Reference numerals: 100-valve box, 110-installation cavity, 111-first sealing ring surface, 112-second sealing ring surface, 113-connecting ring surface, 120-through hole, 131-first box end face, 132-second box end face, 133-third box end face, 134-fourth box end face, 135-fifth box end face, 136-sixth box end face, 140-avoidance groove, 161-second liquid discharge channel, 171-second liquid inlet channel, 180-packing mounting hole, 200-valve seat, 200a-seat body, 200b-lining ring, 213-first seat end face, 214-second seat end face, 215-connecting side, 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 drainage channel, 241-second port, 251-first mating concave surface, 252-second mating concave surface, 310a-liquid inlet valve assembly, 310b-drainage valve assembly, 320-discharge flange, 331-packing box, 332-packing pressure cap, 333-packing assembly, 334-sealing ring, 341-discharge pressure cap, 342-discharge pressure cover, 360-tee, 400-plunger, 510-threaded connection, 520-fastener, 620-protective plate, 621-bridging part, 621a-through hole, 622-shielding rib plate, 623-circumferential connection part, 640-wear-resistant ring, 900-power end, X-first direction, Y-second direction, Z-third direction, HP-high pressure chamber, LP-low pressure chamber, AP-alternating chamber. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0013] like Figure 1-18 As shown, the embodiment of the present application discloses a valve box 100, a hydraulic end and a pump, wherein Figure 3-Figure 5 As shown, the embodiment of the present application discloses a valve box 100, as shown in FIG. Figure 1 As shown, the valve box 100 can be applied to the fluid end, and as Figure 17 and Figure 18 As shown, the hydraulic end can also be applied to a pump. Of course, in other solutions, the valve box 100 can also be applied to other structures or other styles of pump structures. For ease of description, the valve box will be introduced below using the valve seat 200 applied to the hydraulic end of the pump as an example.

[0014] In a pump, the hydraulic end cooperates with the power end 900 to pump liquid. The power end 900 provides driving force and typically includes a motor or other drive components. In the hydraulic end disclosed in the embodiments of this application, it includes a valve box 100 and a valve seat 200. The valve seat 200 restricts the flow path of the liquid. Of course, to ensure that the liquid inlet and outlet processes can proceed independently, the hydraulic end may also include a one-way valve and necessary sealing components. The valve box 100 serves as the installation base for other structures in the hydraulic end, and the valve box 100 generally includes a mounting cavity 110. At the same time, in order to ensure that liquid can enter the hydraulic end and be discharged from the hydraulic end, the valve box 100 is also provided with a liquid inlet channel and a liquid discharge channel. Moreover, during the operation of the hydraulic end, the valve seat 200 cooperates with the corresponding one-way valve to enable the hydraulic end to alternately perform the liquid inlet process and the liquid discharge process. For this purpose, a liquid inlet channel and a liquid discharge channel are also provided on the valve seat 200. For ease of understanding, the liquid inlet channel provided on the valve seat 200 is the first liquid inlet channel 220, and the liquid inlet channel provided on the valve box 100 is the second liquid inlet channel 171. Correspondingly, the liquid discharge channel provided on the valve seat 200 is the first liquid discharge channel 240, and the liquid discharge channel provided on the valve box 100 is the second liquid discharge channel 161. At the same time, the first liquid inlet channel 220 is connected to the second liquid inlet channel 171, and the first liquid discharge channel 240 is connected to the second liquid discharge channel 161.

[0015] In more detail, Figure 3 As shown, in the embodiment of the present application, the valve seat 200 is a block-shaped structural member as a whole, 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 surface of the valve seat 200. Generally speaking, the connecting side face 215 surrounds the straight line of the axial direction of the valve seat 200. Alternatively, the connecting side surface 215 may be a cylindrical side structure, i.e., the radial dimensions at any position on the connecting side surface 215 are the same. Alternatively, the connecting side surface 215 may be an irregular annular structure. For example, a certain position or a certain point area, or even a certain annular area, on the connecting side surface 215 may be recessed relative to other positions, i.e., the radial dimension at that position is smaller than the radial dimensions at other positions. This allows the aforementioned position of the connecting side surface 215 to form a cavity with the cavity wall of the mounting cavity 110, which provides a flow path for the liquid. Intuitively, the direction X in the figure is the axial direction of the valve seat 200, and this direction X may also be referred to as the first direction.

[0016] In order to prevent the second liquid inlet channel 171 and the second liquid discharge channel 161 of the valve box 100 from intersecting with each other, thereby causing stress concentration at the intersection of the two in the valve box 100, in the embodiment of the present application, the second liquid inlet channel 171 and the second liquid discharge channel 161 do not intersect with each other, 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 hydraulic end can still perform liquid inlet and liquid discharge operations normally, in the axial direction of the valve seat 200, one-way valves are provided at opposite ends of the valve seat 200. The one-way valves are specifically valve assemblies, wherein the valve assembly provided at one end of the valve seat 200 is a liquid inlet valve assembly 310a, and the valve assembly provided at the other end of the valve seat 200 is a liquid discharge valve assembly 310b. Accordingly, The second liquid inlet channel 171 of the valve box 100 is arranged at a position corresponding to or adjacent to the liquid inlet valve assembly 310a, and the second liquid discharge channel 161 of the valve box 100 is arranged at a position corresponding to or adjacent to the liquid discharge valve assembly 310b. As mentioned above, since the liquid inlet valve assembly 310a and the liquid discharge valve assembly 310b are distributed along the axial direction of the valve seat 200, and the valve seat 200 is also separated therebetween, the second liquid inlet channel 171 and the second liquid discharge channel 161 on the valve box 100 also have a certain size interval in the above-mentioned axial direction, which can ensure that the second liquid inlet channel 171 and the second liquid discharge channel 161 will not intersect, so that the valve box 100 of the hydraulic end disclosed in the embodiment of the present application does not have a cross intersection line, which can improve the service life of the valve box 100.

[0017] As mentioned above, the valve seat 200 is provided with a first liquid inlet channel 220, the valve box 100 is provided with a second liquid inlet channel 171, and the valve box 100 is provided with an installation cavity 110, and 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 channel 220 can be connected with the second liquid inlet channel 171, in an embodiment of the present application, the first port 221 of the first liquid inlet channel 220 is located on the connecting side 215, that is, the first port 221 of the first liquid inlet channel 220 extends to the connecting side 215 of the valve seat 200 to ensure that the first liquid inlet channel 220 can be connected with the second liquid inlet channel 171 on the valve box arranged on the periphery of the installation cavity 110.

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

[0019] At the same time, the first liquid discharge channel 240 of the valve seat 200 is used to connect the areas where the liquid inlet valve assembly 310a and the liquid discharge valve assembly 310b are respectively located. As mentioned above, in the hydraulic 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 set through 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 connected through the first liquid discharge channel 240. In more detail, taking the example of the valve seat 200 being axially oriented in the left-right direction, and the side where the first seat end surface 213 is located being the left side of the valve seat 200, and the side where the second seat end surface 214 is located being the right side of the valve seat 200, the first drainage channel 240 can interconnect the left and right sides of the valve seat 200, and one of the liquid inlet valve assembly 310a and the liquid discharge valve assembly 310b is located on the left side, and the other is located on the right side, ensuring that liquid drawn into the area where the liquid inlet valve assembly 310a is located can flow through the first drainage channel 240 to the area where the liquid discharge valve assembly 310b is located. In addition, to prevent stress concentration on the valve seat 200, in the valve seat 200 disclosed in the embodiment of the present application, the first drainage channel 240 does not intersect with the first liquid inlet channel 220. This ensures that the valve seat 200 does not have a cross-intersection line due to the intersection of the channels, ensuring that the stress at different positions on the valve seat 200 is relatively dispersed, and preventing the valve seat 200 from being easily damaged due to stress concentration.

[0020] Furthermore, a second drainage channel 161 is provided on the valve box 100 at a location corresponding to the drainage valve assembly 310b. This allows liquid flowing into the area where the drainage valve assembly 310b is located to be discharged outside the valve box 100 through the second drainage channel 161, completing a liquid intake and discharge cycle. During this repeated intake and discharge cycle, liquid is continuously drawn in through the second liquid inlet channel 171 and discharged through the second drainage channel 161.

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

[0022] Of course, in order to ensure a reliable sealing relationship 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 box 100 where the plunger 400 is located. More specifically, if there are multiple mounting cavities 110 in the valve box 100, there can be multiple packing boxes 331, and they can be connected one-to-one to the locations where the multiple mounting cavities 110 are located. Of course, the packing box 331 also has a through cavity to accommodate the plunger 400. In other embodiments of the present application, the packing box 331 can also be provided with multiple through cavities, and the number of packing boxes 331 can be reduced to one. The packing box 331 is fixedly connected to the valve box 100, and the multiple through cavities correspond one-to-one to the multiple mounting cavities 110. In another embodiment of the present application, the packing box 331 and the valve box 100 can be an integrated structure. In this case, the valve box 100 and the packing box 331 no longer have a clear boundary in structure, and the two are only differentiated in function.

[0023] Taking the packing box 331 and the valve box 100 as a split structure as an example, a sealing ring 334 is provided between the packing box 331 and the valve box 100, and the sealing ring 334 is usually formed of a metal material to provide a seal for the connection surface between the packing box 331 and the valve box 100, and a packing assembly 333 is provided on the side of the packing box 331 away from the valve box 100, which is used to provide a sealing effect 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 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.

[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 in the installation cavity 110 of the valve box 100, 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 interconnected with the installation cavity 110 of the valve box 100, and then, in order to ensure that the liquid inlet process and the liquid discharge process can be carried out independently and separately, when assembling the valve seat 200 and the valve During the process of the valve box 100, it is necessary to ensure that the second liquid inlet channel 171 and the second liquid discharge channel 161 are isolated from each other, thereby ensuring that the liquid entering the valve box 100 through the second liquid inlet channel 171 can only flow toward the valve seat 200 or flow through the valve seat 200 to 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 from the second liquid discharge channel 161, and will not flow back to the second liquid inlet channel 171.

[0025] To ensure that the second liquid inlet channel 171 and the second liquid discharge channel 161 are isolated from each other, the related art provides sealing rings at opposite ends of the valve seat 200. The two sealing rings and the side surfaces of the valve seat 200 form a sealing structure, thereby preventing direct exchange of liquids in the second liquid inlet channel 171 and the second liquid discharge channel 161. However, during operation of the pump, driven by the flow of liquid, the valve housing 100 may slightly shake relative to the valve housing 100, or even the valve seat 200 may rotate relative to the valve housing 100. This can significantly adversely affect the sealing reliability of the sealing rings at opposite ends of the valve seat 200, thereby hindering the normal operation of the pump.

[0026] To this end, in the valve seat 200 disclosed in the embodiment of the present application, its connecting side surface 215 cooperates with a sealing ring and other structures to produce a sealing effect. More specifically, a first sealing member and a second sealing member are provided between the connecting side surface 215 and the cavity wall of the installation cavity 110. In a first direction, the first sealing member and the second sealing member are respectively located on opposite sides of the second liquid inlet channel 171 of the valve box 100. This allows the cavity wall of the installation cavity 110, the first sealing member, the connecting side surface 215, and the second sealing member to 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 that 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.

[0027] As described above, in the axial direction of the valve seat 200, the first drainage channel 240 is arranged to pass through the valve seat 200. For this purpose, of the opposite end ports of the first drainage channel 240, one is located on the side of the first seal away from the second seal, and the other is located on the side of the second seal away from the first seal. This can ensure that the second drainage channel 161 is located as a whole outside the aforementioned sealed space, so that the second liquid inlet channel 171 can form a good isolation relationship with the second drainage channel 161.

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

[0029] In order to further improve the sealing reliability of the first seal and the second seal, 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 connecting side 215 of the valve seat 200. The annular groove may include a first annular groove 216 and a second annular groove 217. The first seal can be installed in the first annular groove 216, and correspondingly, the second seal is installed in the second annular groove 217. The first seal and the second seal are both sealed with the valve seat 200 and the valve box 100. In detail, the inner sides of the rings of the first seal and the second seal are both sealed with the valve seat 200, and the outer sides of the rings of the first seal and the second seal are both sealed with the valve box 100.

[0030] To reduce the difficulty of processing, more specifically, the first annular groove 216 can be entirely located on the outer peripheral surface (i.e., the connecting side surface 215) of the valve seat 200 or the wall of the installation cavity 110 of the valve housing 100. Correspondingly, the second annular groove 217 can also be entirely located on the outer peripheral surface (i.e., the connecting side surface 215) of the valve seat 200 or the wall of the installation cavity 110 of the valve housing 100. For example, the wall of the installation cavity 110 of the valve housing 100 is provided with the first annular groove 216 and the second annular groove 217 spaced apart along the aforementioned axial direction.

[0031] In another embodiment of the present application, Figure 14 and Figure 16As shown, the connecting side surface 215 of the valve seat 200 is provided with a first annular groove 216 and a second annular groove 217 distributed along the aforementioned axial interval. In the case where the valve seat 200 is provided with the first annular groove 216 and the second annular groove 217, since both of the first annular groove 216 and the second annular groove 217 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 217 can be reduced. In addition, in this case, the valve box 100 can also be formed in an integral molding manner, and by extending the installation cavity 110 to the outer surface of the valve box 100, the valve box 100 and the valve seat 200 can be assembled. 00, the first seal can be pre-installed in the first annular groove 216, and the second seal can be installed in the second annular groove 217. After that, the valve seat 200 can be gradually pushed into the installation cavity 110 from the opening of the installation cavity 110 on the outer surface of the valve box 100, and as the valve seat 200 gradually enters the installation cavity 110, the first seal and the second seal can be correspondingly squeezed to ensure that the first seal and the second seal can respectively form an extrusion fitting relationship with the cavity wall of the installation cavity 110, which can further reduce the difficulty of installing the first seal and the second seal.

[0032] In order to prevent the structural strength of the corresponding device from being significantly adversely affected by the provision of too many annular grooves, in another embodiment of the present application, one of the first annular groove 216 and the second annular groove 217 is provided on the valve seat 200, and the other is provided on the valve housing 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 housing 100 is provided with the second annular groove 217. Accordingly, in the axial direction of the valve seat 200, the first port 221 of the first liquid inlet channel 220 is located between the first annular groove 216 and the second annular groove 217.

[0033] In order to reduce the overall processing difficulty of the valve seat 200 and the valve box 100 in the hydraulic end, in a further embodiment of the present application, the axes of different parts of the connecting side surface 215 can be arranged collinearly. Of course, in the process of designing the valve box 100, it is also necessary to arrange the axes of different parts of the cavity wall of the installation cavity 110 of the valve box 100 in a corresponding collinear manner, so as to ensure that the valve seat 200 can be installed more accurately at the corresponding position in the installation cavity 110 of the valve box 100, and to make the fitting clearance between the valve seat 200 and the valve box 100 relatively smaller, thereby further improving the fitting tightness between the valve seat 200 and the valve box 100.

[0034] The embodiment of the present application discloses a hydraulic end, which includes a valve box 100, a valve seat 200, a valve assembly and a plunger 400, wherein the valve box 100 is provided with an installation cavity 110, and in a first direction, the installation cavity 110 is arranged to penetrate the valve box 100. At the same time, in the embodiment of the present application, the installation cavity 110 or the extension direction of the installation cavity 110 is used to install the valve seat 200, the valve assembly and the plunger 400. That is, in the hydraulic end disclosed in the embodiment of the present application, the valve seat 200 can provide a flow path for the liquid, and because the valve seat 200, the valve assembly and the plunger 400 are all located in the extension direction of the installation cavity 110 as a whole, the liquid filling and discharge processes in the hydraulic end can be affected by the position of the valve assembly.

[0035] In more detail, in the hydraulic end disclosed in the embodiment of the present application, the valve assembly includes a liquid inlet valve assembly 310a and a liquid discharge valve assembly 310b, which are opened during the liquid inlet process and the liquid discharge process, respectively. Conversely, the liquid inlet valve assembly 310a and the liquid discharge valve assembly 310b are closed during the liquid discharge process and the liquid inlet process, respectively. In the hydraulic 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 at opposite ends of the valve seat 200. This ensures that the liquid inlet path and the liquid discharge path of the hydraulic end are necessarily located in the areas where the opposite ends of the valve seat 200 are located. In this case, the second liquid inlet channel 171 and the second liquid discharge channel 161 in the valve box 100, which respectively provide liquid inlet and liquid discharge functions, do not intersect with each other, so that the valve box 100 of the hydraulic end disclosed in the embodiment of the present application no longer has a cross intersection line, which can improve the overall service life of the valve box 100.

[0036] 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. To further improve the liquid inlet efficiency of the valve seat 200, in other embodiments of the present application, a plurality of first liquid inlet channels 220 may be provided. Of course, 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 plurality of first liquid inlet channels 220 are all located on the connecting side surface 215. More specifically, the first ports 221 of the plurality of first liquid inlet channels 220 may be distributed at intervals along the circumference of the connecting side surface 215.

[0037] 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, if there are multiple first liquid inlet channels 220 on the valve seat 200, the valve box 100 can also have multiple second liquid inlet channels 171, and any first liquid inlet channel 220 of the valve seat 200 installed in a certain installation cavity 110 is correspondingly provided with at least one second liquid inlet channel 171. Considering that other channel structures are usually required on the valve box 100, in order to reduce design difficulty, in a specific embodiment of the present application, any installation cavity 110 in the valve box 100 can be correspondingly provided with one or two second liquid inlet channels 171.

[0038] When the number of second liquid inlet channels 171 corresponding to any installation cavity 110 is less than the number of first liquid inlet channels 220 of the valve seat 200 installed in the installation cavity 110, a connecting cavity can be formed between the connecting side surface 215 and the cavity wall of the installation cavity 110 by making the area where the first port 221 is located in the connecting side surface 215 concave. When the aforementioned concave area of the connecting side surface 215 is arranged in a surrounding manner as a whole, each first liquid inlet channel 220 and each second liquid inlet channel 171 can be connected to the aforementioned connecting cavity, ensuring that the liquid entering the aforementioned connecting cavity through the second liquid inlet channel 171 can flow into different first liquid inlet channels 220 respectively.

[0039] It should be noted that in the embodiment of the present application, since the number of second liquid inlet channels 171 corresponding to any installation cavity 110 is less than the number of first liquid inlet channels 220 of the valve seat 200 installed in the installation cavity 110, and therefore, when one or several of the multiple first liquid inlet channels 220 are opposite to one or more second liquid inlet channels 171 one by one, the remaining one or several of the multiple first liquid inlet channels 220 objectively cannot be opposite to other second liquid inlet channels 171.

[0040] Based on the above, to improve the liquid inlet efficiency of each first liquid inlet channel 220, the plurality of first ports 221 are optionally distributed at intervals along the circumference of the connecting side surface 215. This can improve the dispersion of the plurality of first liquid inlet channels 220, thereby ensuring relatively high liquid inlet efficiency for one or more first liquid inlet channels 220 that are not directly opposite the second liquid inlet channel 171. In a further embodiment of the present application, the plurality of first liquid inlet channels 220 are evenly distributed along the axial direction around the valve seat 200 (i.e., the direction surrounding the connecting side surface 215), which can further improve the structural reliability of the valve seat 200.

[0041] Furthermore, if there are multiple second liquid inlet channels 171, the multiple second liquid inlet channels 171 can be evenly arranged in the axial direction around the valve seat 200. For example, if the valve seat 200 is a cubic structure as a whole, in a specific embodiment of the present application, a second liquid inlet channel 171 can be provided above and below any mounting cavity 110, wherein the aforementioned distribution direction of the upper and lower parts is specifically the second direction, i.e., direction Y in the figure. Of course, if there are other requirements, only one second liquid inlet channel 171 can be provided above or below any mounting cavity 110, and by appropriately increasing parameters such as the cross-sectional area of the second liquid inlet channel 171, it can also be ensured to a certain extent that one second liquid inlet channel 171 can more efficiently supply liquid to the multiple first liquid inlet channels 220. In addition, the extension direction of the second liquid inlet channel 171 can be parallel to the second direction, or can be inclined relative to the second direction. Of course, in order to maximize the liquid inlet efficiency of the second liquid inlet channels 171 corresponding to the multiple installation cavities 110 and improve the space utilization of the valve box 100, the extension direction of each second liquid inlet channel 171 is located in the plane formed by the second direction and the first direction.

[0042] In order to express the above technical solution more clearly, in detail, in the hydraulic end disclosed in the embodiment of the present application, the valve box 100 has a first box end face 131 and a second box end face 132, wherein, in the first direction, the first box end face 131 and the second box end face 132 are respectively located at opposite ends of the valve box 100, and accordingly, the installation cavity 110 extends from the first box end face 131 to the second box end face 132 along the first direction.

[0043] At the same time, the valve box 100 also has a third box end face 133 and a fourth box end face 134. The third box end face 133 and the fourth box end face 134 are both located between the first box end face 131 and the second box end face 132, and in the second direction, the fourth box end face 134 and the third box end face 133 are respectively located at opposite ends of the valve box. As above, the second direction is not parallel to the first direction. Optionally, the second direction and the first direction are perpendicular to each other, or the two may also have an inclination angle, and the aforementioned inclination angle is not 0° and is not 90°.

[0044] Based on the above, the valve box 100 is provided with a plurality of second liquid inlet channels 171 and a plurality of mounting cavities 110. The plurality of mounting cavities 110 are arranged at intervals along the third direction, wherein the third direction is non-parallel to the first direction and the third direction is non-parallel to the second direction. Furthermore, in the hydraulic end disclosed in the embodiment of the present application, each mounting cavity 110 is connected to a second liquid inlet channel 171, each second liquid inlet channel extends along the second direction, and each second liquid inlet channel 171 extends to the third box end surface 133 or the fourth box end surface 134.

[0045] To improve the drainage efficiency of the valve seat 200, similarly, the number of first drainage channels 240 can also be multiple, and the multiple first drainage channels 240 are distributed at intervals along the circumference of the connecting side surface 215. Optionally, the first drainage channel 240 is a curved extension structure. To improve the drainage efficiency of the first drainage channel 240, in a specific embodiment of the present application, the first drainage channel 240 is a linear structure. As described above, the first drainage channel 240 can provide communication between the liquid inlet valve assembly 310a and the liquid discharge valve assembly 310b on opposite sides of the valve seat 200. To this end, in a specific embodiment of the present application, the first drainage channel 240 can extend along the axial direction of the valve seat 200, that is, the extension directions of the multiple first drainage channels 240 are parallel to each other and are parallel to the straight line on which the axial direction of the valve seat 200 is located.

[0046] To improve the space utilization of the valve seat 200, in another embodiment of the present application, the extension direction of the first drainage channel 240 can be tilted relative to the axial direction of the valve seat 200. In this case, the extension directions of the multiple first drainage channels 240 may no longer be parallel to each other, but overall, the multiple first drainage channels 240 can still be spaced apart along the axial direction around the valve seat 200. Of course, when there are multiple first liquid inlet channels 220 and multiple first drainage channels 240, no first liquid inlet channel 220 intersects with any other first drainage channel 240, ensuring that no cross intersection lines are formed on the valve seat 200, thereby improving the overall service life of the valve seat 200.

[0047] As described above, in the hydraulic end of the pump, a liquid inlet valve assembly 310a and a liquid outlet valve assembly 310b are respectively provided outside the opposite ends of the valve seat 200 along the axial direction of the valve seat 200. In order to increase the liquid holding capacity of the areas outside the opposite ends of the valve seat 200 and enhance the fit between the valve seat 200 and the valve assembly, in a specific embodiment of the present application, the valve seat 200 has a first mating concave surface 251, and the first mating concave surface 251 is recessed relative to the first seat end surface 213. The first mating concave surface 251 is used to mate 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, the first mating concave surface 251 is used to mate with the liquid inlet valve assembly 310a.

[0048] More specifically, during the liquid inlet process, the plunger 400 moves in a direction away from the valve seat 200, so that the plunger 400 can generate a suction effect on the liquid in the second liquid inlet channel 171, thereby causing the liquid to flow along the second liquid inlet channel 171 and 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 is opened. Correspondingly, during the liquid discharge process, the plunger 400 moves in a direction close to the valve seat 200, so that the plunger 400 can exert a squeezing effect on the liquid 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 allowing the liquid to be discharged out of the valve box 100 through the second liquid discharge channel 161.

[0049] Optionally, the axis of the first mating concave surface 251 and the axis of the connecting side surface 215 are not collinearly arranged. For example, the two can have an angle greater than 0° and less than 90°. Alternatively, in another embodiment of the present application, the axis of the first mating concave surface 251 and the axis of the connecting side surface 215 can be parallel and non-collinear. In this case, the liquid inlet valve assembly 310a and the valve seat are in a staggered distribution state.

[0050] In order to improve the fitting accuracy between the valve assembly and the valve seat 200 that fit with the first fitting concave surface 251, and to reduce the flow rate of the liquid due to turning or translation during the flow process, in another embodiment of the present application, the axis of the first fitting concave surface 251 can be set collinearly with the axis of the connecting side surface 215 to improve the liquid exchange efficiency.

[0051] Furthermore, a mating concave surface may also be provided on one side of the second seat end face 214 in the valve seat 200, and the mating concave surface is specifically a second mating concave surface 252, and the second mating concave surface 252 is recessed relative to the second seat end face 214, so 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.

[0052] Similarly, the axis of the second mating concave surface 252 can also be set non-collinearly with the axis of the connecting side surface 215. 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 can be set collinearly with the axis of the connecting side surface 215.

[0053] 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 channel 220 and the second liquid inlet channel 171 can be multiple, and the first port 221 of each of the multiple first liquid inlet channels 220 extends to the connecting side 215, and the other end ports of the multiple first liquid inlet channels 220 can extend to the central area of the valve seat 200 and close to the side of the first mating concave surface 251. In this case, a cavity can be set by making the aforementioned central area of the valve seat 200 close to the first mating concave surface 251, so that one end ports of the multiple first liquid inlet channels 220 can be connected to the aforementioned cavity. At the same time, the aforementioned cavity is connected to the first mating concave surface 251, so that when the liquid inlet valve assembly 310a is opened, the aforementioned cavity is connected to the area where the liquid inlet valve assembly 310a is located, so as to further improve the liquid inlet efficiency.

[0054] At the same time, one end of each of the plurality of second liquid inlet channels 171 can extend to the first seat end surface 213. Since the aforementioned cavity is provided on the side of the central region of the valve seat 200 near the first mating concave surface 251, the aforementioned ends of the plurality of second liquid inlet channels 171 can be located relatively outer than the first seat end surface 213. This allows for greater dispersion between the first liquid inlet channel 220 and the first liquid discharge channel 240, further enhancing the structural stability of the valve seat 200 and minimizing interference between the liquid inlet and discharge processes. Furthermore, each first liquid discharge channel 240 can be configured to extend at an angle relative to the axial direction of the valve seat 200, such that the other end of each first liquid discharge channel 240 (denoted as the second end 241) can extend to the central region of the second mating concave surface 252 and communicate with the liquid discharge valve assembly 310b located on the side of the second mating concave surface 252.

[0055] Based on the valve seat 200 disclosed above, the embodiments of the present application further disclose a hydraulic end, in which, as described above, the valve box 100 is provided with a mounting cavity 110, a second liquid inlet channel 171, and a second liquid discharge channel 161. The valve seat 200 can be installed in the mounting cavity 110 of the valve box 100, and the second liquid inlet channel 171 is connected to the first liquid inlet channel 220, and the second liquid discharge channel 161 is connected to the first liquid discharge channel 240. Of course, the hydraulic end can also include the first and second sealing members described above for providing sealing between 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.

[0056] In more detail, as described above, the valve seat 200 is installed in the installation cavity 110 of the valve box 100. In order to ensure that the valve seat 200 can be installed in the installation cavity 110, optionally, the valve box 100 includes two symmetrically arranged structures, and the two structures are docked and fixed to each other to form the installation cavity 110. Then, the valve seat 200 can be installed in a certain part of the structure first, and then the two parts of the structure are fixedly connected to ensure that the valve seat 200 can be installed in the installation cavity 110.

[0057] To improve the structural reliability and sealing performance of the valve housing 100, in another embodiment of the present application, a mounting cavity 110 is provided through the valve housing 100 along the axial direction of the valve seat 200. That is, in a first direction, the mounting cavity 110 is provided through the valve housing 100. In other words, the mounting cavity 110 extends from one end surface of the valve housing 100 to the other end surface of the valve housing 100 along the first direction. At the same time, by ensuring that the opening of the mounting cavity 110 on at least one end surface of the valve housing is larger than the maximum diameter of the valve seat 200, it is ensured that the valve seat 200 can be installed within the mounting cavity 110 of the valve housing through the aforementioned opening. Accordingly, in the hydraulic end disclosed in the embodiment of the present application, the mounting cavity or the extending direction of the mounting cavity (i.e., the first direction) is used to install the valve seat 200, the valve assembly, and the plunger 400. More specifically, during the assembly process, the plunger, the inlet valve assembly 310a, the valve seat 200, and the outlet valve assembly 310b are arranged in sequence.

[0058] Of course, after the valve seat 200 is installed in the installation cavity 110, in order to ensure that the installation cavity 110 can still form a closed environment, the hydraulic end can also include structures such as a discharge pressure cap 341 and a discharge pressure cover 342, wherein the discharge pressure cover 342 is located on the side of the discharge valve assembly 310b away from the valve seat 200, and the discharge pressure cover 342 is relatively fixed to the valve box 100, the discharge pressure cap 341 is installed on the side of the discharge pressure cover 342 away from the discharge valve assembly 310b, and the discharge pressure cap 341 can be threadedly connected to the valve box 100 to form a more reliable fixed relationship between the discharge pressure cap 341 and the valve box 100. Of course, a sealing ring can be provided between the discharge pressure cover 342 and the valve box 100 to ensure a more reliable sealing effect between the two.

[0059] As described above, the valve box 100 is provided with a drainage channel, which is specifically the second drainage channel 161, and the second drainage channel 161 is connected to the installation cavity 110. At the same time, since the plunger 400 and the discharge pressure cap 341 are respectively provided at the opposite ends of the installation cavity 110, in the embodiment of the present application, in order to ensure that the second drainage channel 161 can be connected to the installation cavity 110, it is necessary to make the second drainage channel 161 located around the installation cavity 110. In other words, the second drainage channel 161 is not provided at either end of the installation cavity along its own extension direction, or the second drainage channel 161 is located on one side of the installation cavity. In this case, by making the extension direction of the second drainage channel 161 non-parallel to the first direction, it can be ensured that the liquid entering the installation cavity can be normally discharged to the outside of the valve box 100 through the second drainage channel 161. That is, in the embodiment of the present application, the extension direction of the second drainage channel 161 and the extension direction of the installation cavity 110 may be perpendicular to each other, or there may be a relative inclination angle α between the two, and 0°<α<90°.

[0060] Since the installation cavity 110 is provided with structures such as the valve seat 200 and the valve assembly, and in order to ensure that the installation cavity 110 can be communicated with the second drainage channel 161, it is necessary to ensure that the installation cavity 110 and the second drainage channel 161 have overlapping parts. Obviously, the valve seat 200, the drainage valve assembly 310b and the discharge gland 342 and other devices may occupy at least a part of the aforementioned overlapping space, which will have a certain obstruction on the drainage efficiency of the second drainage channel 161. Based on this, in order to minimize the degree of weakening of the drainage efficiency of the second drainage channel 161 caused by the devices arranged in the installation cavity 110, in a specific embodiment of the present application, as Figure 6 As shown, the minimum distance M between the inner wall of the second drainage channel 161 away from the axis of the mounting cavity 110 and the mounting cavity can be made greater than 0. When this technical solution is adopted, the portion of the second drainage channel 161 located outside the mounting cavity 110 can always be unoccupied by the components arranged in the mounting cavity, thereby ensuring that the second drainage channel 161 has relatively good drainage efficiency.

[0061] It should be noted that the installation cavity 110 mentioned in the above description is essentially the area in the installation cavity 110 that is connected to the drainage channel. To this end, more precisely, in the embodiment of the present application, the minimum distance between the portion in the installation cavity 110 that is connected to the second drainage channel 161 and the inner wall of the second drainage channel 161 that is away from the axis of the installation cavity 110 is greater than 0. More intuitively, if Figure 6 As shown, and taking the orientation shown in the figure as an example, in the hydraulic end disclosed in the embodiment of the present application, the minimum distance M between the upper edge of the second drainage channel 161 and the upper edge of the portion of the mounting cavity that is connected to the second drainage channel 161 is greater than 0.

[0062] Furthermore, the radial dimension of the installation cavity 110 is generally larger than the radial dimension of the second drainage channel 161. Therefore, in a specific embodiment of the present application, the axis of the second drainage channel 161 can also be located outside the installation cavity 110. Figure 6 As shown, the axis of the second drainage channel 161 can be located above the mounting cavity 110. To make the entire valve box 100 relatively more compact, in a specific embodiment of the present application, the upper edge of the mounting cavity 110 can be flush with the axis of the second drainage channel 161. Alternatively, the upper edge of the mounting cavity 110 can be slightly extended above the axis of the second drainage channel 161. However, in this case, the distance between the upper edge of the mounting cavity 110 and the axis of the second drainage channel 161 must be at least less than half the radius of the second drainage channel 161. In a specific embodiment of the present application, the distance N between the axis of the mounting cavity 110 and the axis of the second drainage channel 161 can be equal to or greater than 50 mm.

[0063] As described above, a drainage valve and a discharge pressure cover 342 are usually further provided in the installation cavity 110 of the valve box 100. In order to further reduce the influence of the drainage valve assembly 310b and the discharge pressure cover 342 on the drainage efficiency of the second drainage channel 161, in a specific embodiment of the present application, during the operation of the hydraulic end, the maximum area of the second drainage channel 161 invaded by the drainage valve assembly 310b and the discharge pressure cover 342 is less than or equal to 80% of the drainage area of the second drainage channel 161.

[0064] As described above, since the second drainage channel 161 is connected to the installation cavity 110, and the second drainage channel 161 is located around the installation cavity 110, there must be an overlapping area between the two. At the same time, since the drainage valve assembly 310b and the discharge pressure cover 342 are both installed in the installation cavity 110 of the valve box 100, and the second drainage channel 161 needs to correspond to the area where the drainage valve assembly 310b and the discharge pressure cover 342 are located, the drainage valve assembly 310b and the discharge pressure cover 342 will occupy the part of the second drainage channel 161 that overlaps with the installation cavity when they are accommodated in the installation cavity 110. The aforementioned area is the area of the second drainage channel 161 invaded by the drainage valve assembly 310b and the discharge pressure cover 342 during the operation of the hydraulic end. Of course, the aforementioned area refers to the area occupied by the plane figure of the second drainage channel 161 cut by a plane perpendicular to its own axis, that is, the drainage cross-section of the second drainage channel 161.

[0065] As described above, the valve box 100 has a first box end face 131 and a second box end face 132, and during the operation of the hydraulic end, the plunger 400 can make a linear reciprocating motion relative to the valve box, and one end of the plunger 400 is also used to connect with the power end 900. For this reason, in the hydraulic end disclosed in the embodiment of the present application, a portion of the plunger 400 can extend to the side of the first box end face 131 away from the second box end face 132, that is, during the assembly of the pump, the power end 900 can be located on the side of the valve box 100 where the first box end face 131 is located.

[0066] In addition, as mentioned above, a sealed connection relationship needs to be formed between the valve box 100 and the valve seat 200, and a first seal and a second seal can usually be provided between the two. The first seal and the second seal are respectively located on opposite sides of the second liquid inlet channel 171 of the valve box 100, thereby forming a good sealing relationship between the first liquid inlet channel 220 of the valve seat 200 and the second liquid inlet channel 171 of the valve box 100.

[0067] At the same time, the valve box 100 can also form a sealed connection relationship with the packing box 331 through a sealing ring. Of course, the sealing ring is also arranged around the outside of the plunger 400, so that a sealed matching relationship can be formed between the valve box 100, the packing box 331 and the plunger 400 through the sealing ring.

[0068] The cavity wall of the valve box 100 for cooperating with the second sealing member is a portion of the inner wall of the mounting cavity 110, specifically the first sealing ring surface 111. The cavity wall of the valve box 100 for cooperating with the sealing ring is also a portion of the inner wall of the mounting cavity 110, specifically the second sealing ring surface 112. Accordingly, in the first direction, the first sealing ring surface 111 is relatively close to the first box end surface 131, and the second sealing ring surface 112 is relatively close to the second box end surface 132. Of course, the cavity wall of the mounting cavity 110 also includes other portions. Among them, the portion located between the first sealing ring surface 111 and the second sealing ring surface 112 can be used to accommodate the plunger 400, which can be referred to as the connecting ring surface 113. Currently, the area surrounded by the connecting ring surface 113 can also be used to accommodate the liquid inlet valve assembly 310a, and may even be used to accommodate a portion of the valve seat 200.

[0069] That is, in the hydraulic end disclosed in the embodiment of the present application, the cavity wall of the mounting cavity 110 includes a first sealing ring surface 111, a second sealing ring surface 112 and a connecting ring surface 113, wherein the first sealing ring surface 111 and the second sealing ring surface 112 are connected to each other through the connecting ring surface 113, the first sealing ring surface 111 is adjacent to the first box end surface 131, and the second sealing ring surface 112 is adjacent to the second box end surface 132.

[0070] Furthermore, in the hydraulic end disclosed in the embodiment of the present application, the connecting ring surface 113 is an annular closed surface, that is, in the valve box 100 of the hydraulic end disclosed in the embodiment of the present application, there is no opening on the connecting ring surface 113 located between the first sealing ring surface 111 and the second sealing ring surface 112, which makes the sealing effect and sealing reliability of the connecting ring surface 113 relatively high. In addition, when the technical solution disclosed in the embodiment of the present application is adopted, the strength and fatigue resistance of the partial structure of the valve box 100 where the connecting ring surface 113 is located are relatively good, preventing the part of the valve box 100 where the connecting ring surface 113 is located from cracking during the reciprocating motion of the plunger 400 relative to the valve box 100 and driving the liquid to perform the suction and discharge cycle, thereby improving the service life of the entire valve box 100.

[0071] As described above, the valve box 100 is provided with an installation cavity 110, and the installation cavity 110 or the extension direction of the installation cavity 110 is used to install devices such as the valve seat 200. In order to further improve the working efficiency of the hydraulic end, in a specific embodiment of the present application, the valve box 100 can be provided with multiple installation cavities 110, and any installation cavity 110 or the extension direction of the installation cavity 110 can be used to install devices such as the valve seat 200, the liquid inlet valve assembly 310a, the liquid discharge valve assembly 310b and the plunger 400.

[0072] In addition, since the hydraulic end including the valve housing 100 is typically used in conjunction with other devices such as the power end 900, in the hydraulic end disclosed in the embodiment of the present application, the outer periphery of the mounting cavity 110 provided on the valve housing 100 can be provided with a plurality of through-holes 120, and the connecting bolts can be installed in the through-holes 120 of the valve housing 100, thereby allowing the hydraulic end to be fixedly connected to other devices such as the power end 900 via the connecting bolts. In the case of the embodiment of the present application, the through-holes 120 provided through the valve housing 100 enable the connecting bolts to provide a relatively strong connection effect to the valve housing 100. Therefore, even if the weight of the device such as the valve housing is relatively large and the vibration generated during operation is relatively severe, the assembly stability between the valve housing 100 and other devices such as the power end 900 can be relatively high. In addition, the number of through-holes 120 provided on the outer periphery of the mounting cavity can be two, three, or more. To balance assembly stability and assembly difficulty, in a specific embodiment of the present application, the outer periphery of the mounting cavity 110 can be provided with four through-holes 120. Optionally, a plurality of packing installation holes 180 may be provided on the periphery of the installation cavity to facilitate the assembly process between the valve box and the packing box 331 .

[0073] As described above, the installation cavity 110 of the valve box 100 extends from the first box end face 131 to the second box end face 132 of the valve box 100 along the first direction. In this case, in a specific embodiment of the present application, the through hole 120 can also be extended from the first box end face 131 to the second box end face 132 in the first direction to penetrate the valve box. This makes the length of the connecting bolt used to cooperate with the through hole 120 relatively large, thereby further improving the assembly reliability between the valve box 100 and other mechanisms such as the power end 900.

[0074] Considering that the outer periphery of the mounting cavity 110 in the valve box 100 is provided with a plurality of through-holes 120, and that each of the through-holes 120 can be installed with connecting bolts, in addition, as described above, the valve box 100 can also include multiple mounting cavities 110, and further, each mounting cavity 110 can be provided with a plurality of connecting bolts on its outer periphery, in this case, a large number of connecting bolts can easily provide a good and stable assembly effect for the valve box 100 and other mechanisms such as the power end 900. To this end, for each connecting bolt, it is essentially only necessary that it has an appropriate length.

[0075] Furthermore, in another embodiment of the present application, a groove can be formed on the surface of the valve box 100 so that the through hole 120 does not need an excessively large axial dimension to penetrate a portion of the valve box by digging, thereby ensuring that the connecting bolt can also complete the installation work normally. In detail, in the embodiment of the present application, the portion of the valve box 100 located between the first box end face 131 and the second box end face 132 is provided with an avoidance groove 140. The avoidance groove 140 is recessed from the surface of the valve box, and the through hole 120 extends from the second box end face 132 to the avoidance groove 140, thereby ensuring that the connecting bolt can still be inserted into the through hole, and one of the opposite ends of the connecting bolt is exposed from the second box end face 132, and the other can be exposed from the avoidance groove 140, ensuring that the connecting bolt and other mechanisms such as the power end 900 and the corresponding nut can all complete the connection work normally, wherein the connecting bolt and the connecting nut constitute a threaded connector 510.

[0076] Based on the technical solutions disclosed in the embodiments of the present application, when the valve box 100 has multiple installation cavities 110, the aforementioned avoidance groove 140 can be provided at a position corresponding to each installation cavity 110. In this case, the avoidance groove 140 can be continuously extended along the distribution direction of the multiple installation cavities 110. In another embodiment of the present application, the number of avoidance grooves 140 can also be multiple, and a rib can be formed between any two adjacent avoidance grooves 140 in the distribution direction of the multiple installation cavities 110. This can improve the connection reliability between the portions of the valve box 100 located on opposite sides of the avoidance groove 140 along the first direction, thereby further improving the service life of the valve box 100.

[0077] As described above, the valve box 100 can be provided with a plurality of mounting cavities 110. In this case, each mounting cavity needs to be provided with a corresponding second liquid inlet channel 171 and a second liquid discharge channel 161. In order to facilitate the mutual communication between the valve box and the external pipeline, the plurality of second liquid inlet channels 171 and the plurality of second liquid discharge channels 161 provided on the valve box 100 can be distributed relatively regularly. For example, a second liquid inlet channel 171 can be provided correspondingly directly above each mounting cavity 110, so that the plurality of second liquid inlet channels 171 can be arranged at intervals along the distribution direction of the plurality of mounting cavities. In this case, a liquid inlet manifold can be used to simultaneously communicate with the plurality of second liquid inlet channels 171, so that the sucked liquid can be transported to the plurality of second liquid inlet channels 171 through the liquid inlet manifold. Of course, another second liquid inlet channel 171 can be further provided below each mounting cavity 110, and the plurality of second liquid inlet channels 171 located below the mounting cavity can also be connected to each other through another liquid inlet manifold to improve the liquid inlet efficiency and improve the space utilization of the valve box 100.

[0078] In order to make the volume and weight of the entire hydraulic end relatively small and the shape of the entire hydraulic end relatively regular, so as to facilitate transportation and installation, in a specific embodiment of the present application, the plurality of installation cavities 110 can be arranged along a straight line, and in the extension direction of the installation cavities 110, that is, in the axial direction (or first direction) of the valve seat 200, the opposite ends of the plurality of installation cavities 110 can be arranged flush. Figure 6 As shown, in a specific embodiment of the present application, any valve box 100 can be provided with multiple mounting cavities 110, and each mounting cavity 110 is arranged along a first direction extending through the valve box 100. The multiple mounting cavities 110 can be spaced apart in a third direction, that is, the distribution direction of the multiple mounting cavities 110 can be the third direction. To improve the space utilization of the valve box 100, in this 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). Furthermore, any two of the first, second, and third directions are perpendicular to each other. This can maximize the regularity of the hydraulic end's appearance and minimize the overall volume of the hydraulic end. In this case, the liquid inlet manifold and the manifold can both extend along the third direction, thereby improving the overall regularity of the hydraulic end's appearance and further reducing the overall volume of the hydraulic end, thereby improving the storage and transportation efficiency of the hydraulic end. Intuitively, the third direction can be direction Z in the figure.

[0079] Similarly, the second drainage channels 161 corresponding to each of the multiple installation cavities 110 can also be regularly distributed. Optionally, in a specific embodiment of the present application, a second drainage channel 161 can be provided at another position above each installation cavity 110, and the multiple second drainage channels 161 can also be arranged at intervals along the distribution direction of the multiple installation cavities 110. Based on this, the hydraulic end disclosed in the embodiment of the present application can also include a manifold, which is provided with a manifold and multiple liquid inlets. The multiple liquid inlets are spaced apart along the length of the adapter plate, and any of the liquid inlets can be connected to the corresponding second drainage channel 161, so that the liquid discharged through the multiple second drainage channels 161 can be collected into the manifold of the manifold.

[0080] At the same time, to facilitate the transport of liquid in the manifold, in this embodiment of the present application, a drain port can be provided at one end of the manifold. A discharge flange 320 can be mounted at the drain port using fasteners 520. The discharge flange 320 can be connected to a corresponding flexible or rigid manifold to pump the liquid to the desired location. Furthermore, a tee 360 can be provided at the other end of the manifold to further enhance the controllability of the liquid transport path.

[0081] More specifically, the valve box 100 may also have a fifth box end surface 135 and a sixth box end surface 136. In this case, the valve box 100 as a whole has a cubic structure. It should be noted that the valve box is not necessarily a regular cubic structure, but rather generally resembles a cubic structure. Regarding the outer surface of the valve box, the first box end surface 131, the third box end surface 133, the second box end surface 132, and the fourth box end surface 134 are sequentially connected to form a cylindrical structure. The fifth box end surface 135 and the sixth box end surface 136 are respectively located at opposite ends of the cylindrical structure. Based on this, one of the discharge flange 320 and the tee 360 can be located on the fifth box end surface 135, and the other can be located on the sixth box end surface 136.

[0082] As described above, during the operation of the pump, the valve seat 200 may slightly shake or move relative to the valve box 100 due to the driving effect of the liquid flow. Furthermore, in order to improve the service life of the valve seat 200, in a specific embodiment of the present application, the hydraulic end may also include a wear-resistant ring 640. The wear-resistant ring 640 can be sleeved outside the valve seat 200 and located between the valve seat 200 and the valve seat 200. Of course, the hardness of the wear-resistant ring 640 is greater than the hardness of the valve seat 200, and / or the wear resistance of the wear-resistant ring 640 is greater than the wear resistance of the valve seat 200. The wear-resistant ring 640 and the cavity wall of the installation cavity 110 of the valve box 100 are rubbed against each other to reduce the friction area between the valve seat 200 and the valve box 100, thereby improving the service life of the valve seat 200. Of course, when a wear-resistant ring 640 is provided on the outside of the valve seat 200, it is also necessary to ensure that the inner side of the wear-resistant ring 640 is in sealed connection with the valve seat 200, and the outer side of the wear-resistant ring 640 is in sealed connection with the valve housing 100. More specifically, a first seal can be provided between the inner side of the wear-resistant ring 640 and the valve seat 200, and a third seal can be provided between the outer side of the wear-resistant ring 640 and the valve housing 100. Furthermore, the valve seat 200 can be provided with a first annular groove 216, and the wall of the mounting cavity 110 can be provided with another annular groove, so as to provide installation and limiting functions for the first and third seals, respectively, and further enhance the sealing reliability between the three.

[0083] As described above, the valve seat 200 is provided with a liquid inlet valve assembly 310a and a liquid discharge valve assembly 310b at opposite ends thereof, respectively. 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 flows at a relatively slow rate when entering the region where the liquid inlet valve assembly 310a is located. However, during the liquid discharge process, the liquid is pushed by the plunger 400, resulting in relatively high pressure and flow rate for the liquid in the region where the liquid discharge valve assembly 310b is located when it is discharged from the valve box 100 through the second liquid discharge channel 161. Furthermore, since the liquid discharge valve assembly 310b generally includes a valve body and a valve rubber, and the valve body forms a sealed fit with the valve seat 200 via the valve rubber, the valve rubber 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 is squeezed by the high-pressure liquid.

[0084] For this reason, if the valve rubber is damaged, the liquid flowing into the second liquid discharge channel 161 will invade the valve rubber and flow at high speed to the mating surface of the valve seat facing the valve body, thereby eroding the mating surface of the valve seat facing the valve body (that is, the side surface where the second seat end face is located). This can easily lead to damage to the valve seat, and cause the high-pressure chamber HP where the second liquid discharge channel 161 is located to be connected to the low-pressure chamber LP where the second liquid inlet channel 171 is located, thereby generating high and low cavity cross-pressure, causing the manifold to burst, and seriously affecting the personal safety of the staff.

[0085] To this end, 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 fitting surface between the valve seat 200 and the valve body. In the event that the valve rubber of the drainage valve assembly 310b is damaged, the liquid in the high-pressure chamber HP is prevented from directly eroding the valve seat 200. Of course, since the second port 241 of the first drainage channel 240 is also provided at the end of the valve seat 200 facing the drainage valve assembly 310b, in order to prevent the protective plate 620 from interfering with the normal drainage operation of the first drainage channel 240, the protective plate 620 needs to be provided with a structure such as an avoidance opening to avoid the first drainage channel 240.

[0086] At the same time, in order to ensure that the valve seat 200 and the drainage valve assembly 310b can still form a normal matching relationship when a protective plate 620 is provided on the side of the valve seat 200 facing the drainage valve assembly 310b, at least one of the valve body of the drainage valve assembly 310b and the valve seat 200 can be provided with a receiving groove 230, so as to utilize the receiving groove 230 to provide an installation space for the protective plate 620. Considering that the thickness and size of the valve body are usually relatively small, in order to prevent the provision of the receiving groove 230 from having a greater adverse effect on the structural strength of the valve body, in a specific embodiment of the present application, the valve seat 200 can be provided with a receiving groove 230, and the receiving groove 230 is recessed relative to the second seat end face 214. As above, the valve seat 200 can also be provided with a second matching concave surface 230. 52. In this case, the accommodating groove 230 can be located in the central area of the second mating concave surface 252, and the accommodating groove 230 can be further recessed relative to the second mating concave surface 252, and the second port 241 of the first drainage channel 240, that is, the end of the first drainage channel 240 away from the first seat end surface 213 is connected to the accommodating groove 230. In other words, the first seat end surface 213 is connected to the accommodating groove 230 through the first drainage channel 240, that is, the first drainage channel 240 extends from the first seat end surface 213 to the accommodating groove 230, ensuring that the liquid flowing out through the first drainage channel 240 can flow through the accommodating groove 230 to the area where the drainage valve assembly 310b is located, and finally be discharged to the outside of the valve box 100 through the second drainage channel 161.

[0087] In more detail, Figure 7As shown, the protective plate 620 includes a bridging portion 621 and at least one shielding rib 622, and each shielding rib 622 is connected to the outer side 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 assembly function for the shielding rib 622. Of course, when the number of shielding ribs 622 is one, the bridging portion 621 and the shielding rib 622 may have no obvious structural boundary. When the number of shielding ribs 622 is multiple, the part located in the center of the multiple shielding ribs 622 can be the bridging portion 621.

[0088] After the protective plate 620 is installed in the accommodating recess 230, the shielding ribs 622 are primarily used to protect the valve seat 200. Therefore, the shielding ribs 622 need to avoid the first drainage channel 240. That is, in the circumferential direction of the connecting side surface 215, that is, in the axial direction around the valve seat 200, the shielding ribs 622 are sandwiched between the first drainage channel 240. Of course, if only one first drainage channel 240 is provided on the valve seat 200, the number of shielding ribs 622 can also be one, and the shielding ribs 622 can extend from one side of the first drainage channel 240 to the other side. For example, if the angle spanned by the first drainage channel 240 in the axial direction around the valve seat 200 is 90°, the angle spanned by the shielding ribs 622 can be 270°. In addition, in the above embodiment, a plurality of first liquid discharge channels 240 may be provided on the valve seat 200. In this case, the number of shielding ribs 622 may also be multiple, and the first liquid discharge channels 240 and the shielding ribs 622 are alternately distributed in the axial direction around the valve seat 200, so that each shielding rib 622 is used to shield the area of the second port 241 in the valve seat 200 where the first liquid discharge channel 240 is not provided.

[0089] Specifically, the protective plate 620 can be formed of a metal material. To further enhance the protective effect of the protective plate 620, in another embodiment of the present application, the hardness of the protective plate 620 can be greater than the hardness of the valve seat 200, and / or the wear resistance of the protective plate 620 can be greater than the wear resistance of the valve seat 200. In this case, the service life of the protective plate 620 can be further increased, thereby further enhancing the protective effect of the protective plate 620 on the valve seat 200. More specifically, in one embodiment of the present application, the material forming the protective plate 620 may include at least one of zirconium oxide, nickel-based tungsten carbide, cobalt-based tungsten carbide, titanium carbide, boron nitride, and ceramic. This allows the protective plate 620 to have relatively high strength and wear resistance while being relatively low in cost and relatively easy to process.

[0090] As described above, the bridge portion 621 is located in the center of the shielding rib 622. Optionally, the bridge portion 621 is a plate-shaped, non-porous structural member, meaning that the two opposing sides of the bridge portion 621 are not interconnected. Because the mating surface between the valve body in the drainage valve assembly 310b and the valve seat 200 cannot directly extend to the center of the valve seat 200, in another embodiment of the present application, a through hole 621a can be provided in the center of the bridge portion 621. The presence of the through hole 621a does not significantly reduce the shielding comprehensiveness of the protective plate 620. The through hole 621a can be a circular hole extending through the bridge portion 621 along its thickness. In this case, the processing and transportation of the entire protective plate 620 are facilitated, while also reducing the weight of the entire protective plate 620, thereby appropriately reducing the weight of the entire hydraulic end.

[0091] In addition, in the above embodiment, the valve seat 200 can also be provided with a second mating concave surface 252, and it is recessed relative to the second seat end face 214. The valve body of the drainage valve assembly 310b can be fitted with the second mating concave surface 252, and when the valve seat 200 is provided with an accommodating groove 230, the second mating concave surface 252 is connected between the second seat end face 214 and the accommodating groove 230. To this end, in the process of forming the second mating concave surface 252, the extension position and extension direction of the second mating concave surface 252 can also be designed so that when the second mating concave surface 252 extends to the side where the accommodating groove 230 is located, it can face the shielding rib 622 of the protective plate 620. Therefore, when the valve rubber of the drainage valve assembly 310b is damaged, causing the liquid in the high-pressure chamber to erode along the second mating concave surface 252 toward the position where the accommodating groove 230 is located, the second mating concave surface 252 can be used to guide the high-pressure liquid to mainly erode the area where the shielding rib 622 of the protective plate 620 is located, so as to further improve the service life of the valve seat 200 and improve the safety of the entire pump.

[0092] As described above, the protective plate 620 can be installed in the accommodating groove 230. Optionally, the protective plate 620 forms a fixed connection with the valve seat 200 through devices such as bolts. In order to reduce the difficulty of installing 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 made to have an interference fit with the accommodating groove 230.

[0093] Specifically, the outer edge of the shielding rib 622 in the protective plate 620 that is away from the bridging portion 621 can be pressed against the inner wall of the accommodating groove 230 to ensure that the protective plate 620 can form a relatively stable assembly relationship with the valve seat 200. In another embodiment of the present application, Figure 9As shown, the protective plate 620 can also include a circumferential connecting portion 623, which is arranged around the outer periphery of the shielding ribs 622, and the outer edges of each shielding rib 622 are fixedly connected to the inner edges of the circumferential connecting portion 623. In this case, the structural stability of the shielding ribs 622 is relatively stronger, preventing the shielding ribs 622 from bending or breaking during transportation, etc., and further improving the structural stability of the protective plate 620.

[0094] Of course, during the processing of the protective plate 620, the bridging portion 621, the shielding rib 622, and the circumferential connecting portion 623 can be formed in an integral manner, which can further enhance the structural stability of the entire protective plate 620 and reduce the processing difficulty of the protective plate 620. Furthermore, when the protective plate 620 includes the circumferential connecting portion 623, the circumferential connecting portion 623 can be used to squeeze the groove sidewall 232 of the accommodating groove 230, so that the entire protective plate 620 can form an interference fit with the accommodating groove 230, ensuring a more reliable fixed assembly relationship between the protective plate 620 and the valve seat 200. Compared with directly squeezing the shielding rib 622 with the accommodating groove 230, the technical solution disclosed in the embodiment of the present application can prevent the shielding rib 622 from bending, deformation, or even breaking during the squeezing process with the accommodating groove 230, thereby improving the service life and protective effect of the protective plate 620.

[0095] In addition, when the protective plate 620 includes a circumferential connecting portion 623, the diameter and other dimensions of the accommodating groove 230 can be appropriately increased so that the circumferential connecting portion 623 does not block the first drainage channel 240. That is, in the embodiment of the present application, in the radial direction of the valve seat 200, the second port 241 of each first drainage channel 240 is spaced apart from the groove sidewall 232 of the accommodating groove 230, wherein the radial direction of the valve seat 200 is perpendicular to the axial direction of the valve seat 200, and the spacing between the first drainage channel 240 and the groove sidewall 232 of the accommodating groove 230 can be determined based on parameters such as the radial dimension of the circumferential connecting portion 623.

[0096] To further prevent deformation or even damage to the protective plate 620 due to compression during installation, in another embodiment of the present application, the valve seat 200 may include a separately formed seat body 200a and a backing ring 200b. The seat body 200a is provided with a recessed groove and a first seat end surface 213, and the recessed groove includes the aforementioned receiving groove 230. Specifically, in the hydraulic end disclosed in this embodiment of the present application, in addition to the receiving groove, the outer portion of the receiving groove 230 is further hollowed out to utilize the recessed groove to accommodate both the backing ring 200b and the protective plate 620. Of course, the seat body is also provided with other structures such as a first liquid drainage channel 240.

[0097] More specifically, the backing ring 200b is located on the side of the protective plate 620 facing away from the first seat end surface 213. The backing ring 200b has the aforementioned second mating concave surface 252 on the side facing away from the protective plate 620, allowing the valve seat 200 to still mate with the drain valve assembly 310b using the second mating concave surface 252 on the backing ring 200b. Simultaneously, the backing ring 200b has an interference fit with the receiving groove 230, positioning the protective plate 620 and the valve seat 200 axially. The backing ring 200b is an annular structure, and its inner diameter can be appropriately increased based on actual needs to ensure that the backing ring does not interfere with or hinder the draining process of the valve seat 200.

[0098] In the embodiment of the present application, the backing ring 200b is used to provide a positioning function for the protective plate 620. Consequently, the radial dimension of the protective plate 620 can be slightly smaller than the radial dimension of the receiving groove 230. This ensures that the protective plate 620 does not squeeze against the valve seat 200 during installation, thereby ensuring that the protective plate 620 has a high structural stability and service life. Accordingly, the radial dimension of the backing ring 200b can be designed so that the backing ring 200b forms an interference fit with the receiving groove 230 during installation, ensuring that the backing ring provides a good positioning function for the protective plate 620.

[0099] It should be noted that the aforementioned receiving groove 230, protective plate 620, and backing ring 200b are not necessarily circular structures. The radial dimensions mentioned above are merely for the purpose of facilitating description of the shapes and assembly relationships of the aforementioned structures. In other embodiments of the present application, the receiving groove 230, protective plate 620, backing ring 200b, and other structures may also be rectangular or other irregular shapes. Of course, to facilitate processing and maximize the comprehensiveness of the protective plate 620, the receiving groove 230, protective plate 620, and backing ring 200b may all be circular or approximately circular structures.

[0100] In the hydraulic end, when a liner ring 200b is provided on the 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 drainage valve assembly 310b can still be the valve seat 200. In this case, the radial dimension of the valve seat 200 may be too large, which is not conducive to the miniaturization of the pump, or the radial dimension of the liner ring 200b may be too small, resulting in a reduction in the positioning effect of the liner ring 200b. In response to the above-mentioned problem, in another embodiment of the present application, the liner ring 200b can be directly matched with the drainage valve assembly 310b, and in order to increase the fitting area between the liner ring 200b and the valve body of the drainage valve assembly 310b, a second fitting concave surface 252 can be provided on the side of the liner ring 200b facing away from the protective plate 620, and 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 fit with the valve body (and the valve rubber) of the drainage valve assembly 310b, and during the liquid filling process, the drainage valve assembly 310b is sealed and fitted with the second fitting concave surface 252 of the liner ring 200b.

[0101] In addition, if the discharge pressure of the hydraulic end is not too large, the protective plate 620 may not be provided on the discharge side of the valve seat 200. In this case, Figure 15 and Figure 16 As shown, the first drainage channel 240 provided on the valve seat 200 can be extended from the first seat end surface 213 to the second mating concave surface 252, so that under the action of the second mating concave surface 252, the fitting area between the valve seat 200 and the drainage valve assembly 310b is increased, thereby improving the stability of the sealing relationship between the two.

[0102] Based on the hydraulic end disclosed in any of the above embodiments, the embodiment of the present application further discloses a valve box 100, which is provided with an installation cavity 110, and in a first direction, the installation cavity 110 is arranged to penetrate the valve box 100, and the installation cavity 110 of the valve box 100, or the extension direction of the installation cavity 110 of the valve box 100 is used to install the valve seat 200, the valve assembly and the plunger 400.

[0103] Based on the hydraulic end disclosed in any of the above embodiments, Figure 17 and Figure 18 As shown, the embodiment of the present application also discloses a pump, which includes any of the above-mentioned hydraulic ends. Of course, the pump can also generally include other mechanisms such as a power end 900 and a speed reduction mechanism. Considering the brevity of the text, they are not introduced here one by one.

[0104] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A hydraulic end, characterized in that: It comprises a valve box (100), a valve seat (200), a valve assembly (310) and a plunger (400), wherein: The valve box (100) is provided with a mounting cavity (110). In a first direction (X), the mounting cavity (110) is arranged to penetrate the valve box (100). The mounting cavity (110) or the extension direction of the mounting cavity is used to mount the valve seat (200), the valve assembly (310) and the plunger (400).

2. The hydraulic end according to claim 1, characterized in that: The valve box (100) has a first box end surface (131) and a second box end surface (132). In the first direction (X), the first box end surface (131) and the second box end surface (132) are respectively located at opposite ends of the valve box (100), and a portion of the plunger (400) can extend to a side of the first box end surface (131) away from the second box end surface (132); The cavity wall of the installation cavity (110) comprises a first sealing annular surface (111), a second sealing annular surface (112) and a connecting annular surface (113); the first sealing annular surface (111) and the second sealing annular surface (112) are connected to each other via the connecting annular surface (113); the first sealing annular surface (111) is adjacent to the first box end surface (131), and the second sealing annular surface (112) is adjacent to the second box end surface (132).

3. The hydraulic end according to claim 2, characterized in that: The connecting annular surface (113) is an annular closed surface.

4. The hydraulic end according to claim 2, characterized in that: A plurality of through holes (120) are provided on the outer periphery of the installation cavity (110), and connecting bolts (511) can be installed in the through holes (120). The hydraulic end can be fixedly connected to other mechanisms via the connecting bolts (511).

5. The hydraulic end according to claim 4, characterized in that: A portion of the valve box (100) located between the first box end surface (131) and the second box end surface (132) is provided with an avoidance groove (140), the avoidance groove (140) being recessed from the surface of the valve box (100), and the through hole (120) extending from the second box end surface (132) to the avoidance groove (140); Alternatively, in the first direction (X), the through hole (120) extends from the first box end surface (131) to the second box end surface (132) to penetrate the valve box (100).

6. The hydraulic end according to claim 2, characterized in that: The valve box (100) has a third box end surface (133) and a fourth box end surface (134), the third box end surface (133) and the fourth box end surface (134) are both located between the first box end surface (131) and the second box end surface (132), and in a second direction (Y), the fourth box end surface (134) and the third box end surface (133) are respectively located at opposite ends of the valve box (100), and the second direction (Y) is non-parallel to the first direction (X); The valve box (100) is provided with a plurality of liquid inlet channels (171) and a plurality of the installation cavities (110), the plurality of the installation cavities (110) being arranged at intervals along a third direction (Z), the third direction (Z) being non-parallel to the first direction (X), and the third direction (Z) being non-parallel to the second direction (Y); Any of the mounting cavities (110) is in communication with the liquid inlet channel (171), each of the liquid inlet channels (171) extends along the second direction (Y), and each of the liquid inlet channels (171) extends to the third box end surface (133) or the fourth box end surface (134).

7. The hydraulic end according to claim 1, characterized in that: The valve box (100) is provided with a drainage channel (161), the drainage channel (161) is communicated with the installation cavity (110), and the drainage channel (161) is located around the installation cavity (110), the extension direction of the drainage channel (161) is non-parallel to the first direction, and the minimum distance (M) between the inner wall of the drainage channel (161) away from the axis of the installation cavity (110) and the installation cavity (110) is greater than 0.

8. The hydraulic end according to claim 7, characterized in that: The valve assembly (310) includes a discharge valve assembly (310b), the discharge valve assembly (310b) is arranged on a side of the valve seat (200) facing away from the plunger (400), and a discharge gland (342) is provided on the side of the discharge valve assembly (310b) facing away from the valve seat (200); During operation of the hydraulic end, the maximum area of the drainage channel (161) invaded by the drainage valve assembly (310b) and the discharge gland (342) is less than or equal to 80% of the drainage area of the drainage channel.

9. A valve box (100), applied to a hydraulic end, characterized in that: The valve box (100) is provided with a mounting cavity (110). In a first direction (X), the mounting cavity (110) is arranged to penetrate the valve box (100). The mounting cavity (110) or the extending direction of the mounting cavity is used to mount a valve seat (200), a valve assembly (310) and a plunger (400).

10. A pump, characterized in that: The invention comprises the liquid end according to any one of claims 1 to 8.

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