Valve box, fluid end and pump

Abstract

The utility model 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] This application belongs to the field of oil and gas and mining technology, specifically relating to a valve box, a hydraulic end and a pump. Background Technology

[0002] Pumps are commonly used equipment in oil and gas extraction. A pump typically consists of a power end and a hydraulic end. The power end transmits power to the hydraulic end to complete the liquid intake and discharge processes. In current pumps, the hydraulic end includes a valve box, which has an installation chamber, an inlet chamber, and a discharge chamber. The inlet and discharge chambers are usually perpendicular to each other, and the plunger is installed in the installation chamber. Inlet and discharge valve assemblies are installed in the inlet and discharge chambers, respectively. During the linear reciprocating motion of the plunger relative to the valve box, the inlet and discharge valve assemblies alternately open and close, thereby completing the liquid intake and discharge process.

[0003] However, in the aforementioned technologies, the inlet and outlet chambers intersect, forming a cross-shaped intersection. During pump operation, the area where the inlet and outlet chambers intersect is frequently impacted by high-pressure liquid. Furthermore, due to its discontinuous shape, this area is prone to fatigue failure, which can lead to cracking at the corresponding position of the valve box, thus significantly affecting the normal operation of the hydraulic end. Utility Model Content

[0004] The purpose of this application is to provide a valve box, a hydraulic end, and a pump to solve the problem in the related art where the valve box of the hydraulic end is prone to cracking at the corresponding position during operation due to the presence of a cross intersection line, which has a significant impact on the normal operation of the hydraulic end.

[0005] In a first aspect, embodiments of this application disclose a hydraulic terminal, which includes a valve box, a valve seat, a valve assembly, and a plunger, wherein,

[0006] The valve box is provided with a mounting cavity. In a first direction, the mounting cavity extends through the valve box and is used to mount the valve seat, the valve assembly, and the plunger in the mounting cavity or in the direction of its extension.

[0007] Secondly, this application discloses a valve box for use in a hydraulic system. The valve box has a mounting cavity. In a first direction, the mounting cavity extends through the valve box. The mounting cavity or its extension direction is used to mount a valve seat, a valve assembly, and a plunger.

[0008] Thirdly, embodiments of this application disclose a pump that includes the aforementioned hydraulic end.

[0009] This application discloses a hydraulic end, which includes a valve box, a valve seat, a valve assembly, and a plunger. The valve box has a mounting cavity, which extends through the valve box in a first direction. In this application embodiment, the mounting cavity or its extension direction is used to mount the valve seat, the valve assembly, and the plunger. That is, in the hydraulic end disclosed in this application embodiment, the valve seat can provide a flow path for the liquid. Since the valve seat, the valve assembly, and the plunger are all located in the extension direction of the mounting cavity, the liquid inlet and outlet processes in the hydraulic end can be affected by the location of the valve assembly.

[0010] More specifically, in the hydraulic terminal disclosed in this application embodiment, the valve assembly includes an inlet valve assembly and a outlet valve assembly, which open during the inlet and outlet processes, respectively, and conversely, close during the outlet and inlet processes, respectively. In the hydraulic terminal disclosed in this application embodiment, the inlet and outlet valve assemblies are located at opposite ends of the valve seat. This ensures that the inlet and outlet paths of the hydraulic terminal are located at opposite ends of the valve seat. Under these conditions, the second inlet channel and the second outlet channel in the valve box, which provide inlet and outlet functions respectively, do not intersect each other. Therefore, the valve box of the hydraulic terminal disclosed in this application embodiment no longer has a cross-shaped intersection line, which can improve the overall service life of the valve box. Attached Figure Description

[0011] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0012] Figure 1 This is a cross-sectional schematic diagram of the hydraulic end disclosed in the embodiments of this application;

[0013] Figure 2 This is a schematic diagram of the hydraulic end structure disclosed in the embodiments of this application;

[0014] Figure 3 This is a schematic diagram of the structure of the valve box in the hydraulic end disclosed in the embodiments of this application;

[0015] Figure 4 This is a schematic diagram of the valve box in the hydraulic end disclosed in an embodiment of this application from another direction;

[0016] Figure 5 This is a cross-sectional schematic diagram of the valve box in the hydraulic end disclosed in the embodiments of this application;

[0017] Figure 6 This is a cross-sectional view of the valve box in the hydraulic end of the embodiment of this application at another location;

[0018] Figure 7 This is a schematic diagram of the structure of the protective plate in the hydraulic end disclosed in an embodiment of this application;

[0019] Figure 8 for Figure 7 The diagram shows the assembly between the protective plate, the drain valve assembly, and the valve seat.

[0020] Figure 9 This is a schematic diagram of another structure of the protective plate in the hydraulic end disclosed in the embodiments of this application;

[0021] Figure 10 for Figure 9 The diagram shows the assembly between the protective plate, the drain valve assembly, and the valve seat.

[0022] Figure 11 This is a schematic diagram of the hydraulic end bushing disclosed in an embodiment of this application;

[0023] Figure 12 This is a cross-sectional schematic diagram of the hydraulic end bushing disclosed in an embodiment of this application;

[0024] Figure 13 This is a schematic diagram showing the assembly between the protective plate, bushing, drain valve assembly, and valve seat.

[0025] Figure 14 This is a schematic diagram of another structure of the valve seat in the hydraulic end disclosed in the embodiments of this application;

[0026] Figure 15 This is another schematic diagram of the structure of the valve seat in the hydraulic end disclosed in the embodiments of this application;

[0027] Figure 16 for Figure 15 A schematic cross-sectional view of the valve seat is shown.

[0028] Figure 17 This is a schematic diagram of the pump structure disclosed in an embodiment of this application;

[0029] Figure 18 This is a schematic diagram of another structure of the pump disclosed in the embodiments of this application.

[0030] Figure label:

[0031] 100-Valve box, 110-Mounting 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-Allowing groove, 161-Second drain channel, 171-Second inlet channel, 180-Packing mounting hole, 200-Valve seat, 200a-Seat body, 200b-Rinse ring, 213-First seat end face, 214-Second seat end face, 215-Connecting side, 216-First annular groove, 217-Second annular groove, 220-First inlet channel, 221-First port, 230-Accommodation groove, 232-Groove Side wall, 240-first drain channel, 241-second port, 251-first mating concave surface, 252-second mating concave surface, 310a-inlet valve assembly, 310b-drain valve assembly, 320-drain flange, 331-packing box, 332-packing cap, 333-packing assembly, 334-sealing ring, 341-drain cap, 342-drain gland, 360-teet, 400-plunger, 510-threaded connector, 520-fastener, 620-protective plate, 621-bridging part, 621a-through hole, 622-shielding rib, 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 Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] like Figure 1-18 As shown, this application discloses a valve box 100, a hydraulic end, and a pump, wherein, as Figures 3-5 As shown in the figure, this application discloses a valve box 100, such as Figure 1 As shown, the valve box 100 can be applied to the hydraulic end, and as... Figure 17 and Figure 18 As shown, the hydraulic end can also be applied to pumps. Of course, in other solutions, the valve box 100 can also be applied to pump structures of other structures or other styles. For ease of description, the following description will take the application of the valve seat 200 to the hydraulic end of the pump as an example to introduce the valve box.

[0034] In the pump, the hydraulic end cooperates with the power end 900 to perform the pumping operation of liquid. The power end 900 provides driving force and typically includes driving devices such as a motor. In the hydraulic end disclosed in this application embodiment, it may include a valve box 100 and a valve seat 200. The valve seat 200 restricts the flow path of the liquid. Of course, in order to ensure that the liquid inlet and outlet processes can be carried out independently, the hydraulic end may also include a check valve and necessary sealing devices. The valve box 100 serves as the mounting base for other structures in the hydraulic end, and typically includes a mounting cavity 110. To ensure liquid can enter and exit the hydraulic end, the valve box 100 also has an inlet channel and a outlet channel. During operation, the valve seat 200, in conjunction with a corresponding check valve, allows the hydraulic end to alternately perform inlet and outlet processes. Therefore, the valve seat 200 also has an inlet channel and an outlet channel. For ease of understanding, the inlet channel on the valve seat 200 is designated as the first inlet channel 220, and the inlet channel on the valve box 100 is designated as the second inlet channel 171. Correspondingly, the outlet channel on the valve seat 200 is designated as the first outlet channel 240, and the outlet channel on the valve box 100 is designated as the second outlet channel 161. The first inlet channel 220 is connected to the second inlet channel 171, and the first outlet channel 240 is connected to the second outlet channel 161.

[0035] More in detail, such as Figure 3 As shown in this embodiment, the valve seat 200 is generally a block structure, and the valve seat 200 has a first end face 213, a second end face 214, and a side surface. In the axial direction of the valve seat 200, the first end face 213 and the second end face 214 are located at opposite ends of the valve seat 200, and are connected to each other via the side surface. Therefore, the side surface has a connecting function and can also be referred to as the connecting side surface 215. The connecting side surface 215 is the outer peripheral surface of the valve seat 200. Generally speaking, the connecting side surface 215 surrounds the axial direction of the valve seat 200. Optionally, the connecting side 215 can be a cylindrical structure, meaning the radial dimension is the same at any position on the connecting side 215. Alternatively, the connecting side 215 can be an irregular annular structure. For example, a certain position or area, or even an annular area, on the connecting side 215 can be recessed relative to other positions, meaning the radial dimension at that location is smaller than the radial dimensions at other locations. This allows the aforementioned position on the connecting side 215 to form a cavity with the cavity wall of the mounting cavity 110, providing a flow path for the liquid. Intuitively, direction X in the figure represents the axial direction of the valve seat 200, and this direction X can also be referred to as the first direction.

[0036] To prevent stress concentration at the intersection of the second inlet channel 171 and the second outlet channel 161 in the valve box 100 due to their mutual intersection, in this embodiment, the second inlet channel 171 and the second outlet channel 161 do not intersect. That is, in this embodiment, the valve box 100 does not have a cross intersection line. In this case, to ensure that the hydraulic end can still perform normal inlet and outlet operations, one-way valves are provided at opposite ends of the valve seat 200 along its axial direction. The one-way valves are specifically valve assemblies. The valve assembly provided at one end of the valve seat 200 is the inlet valve assembly 310a, and the valve assembly provided at the other end of the valve seat 200 is the outlet valve assembly 310b. Correspondingly, The second inlet channel 171 of the valve box 100 is located at a position corresponding to or near the inlet valve assembly 310a, and the second outlet channel 161 of the valve box 100 is located at a position corresponding to or near the outlet valve assembly 310b. As described above, since the inlet valve assembly 310a and the outlet valve assembly 310b are distributed along the axial direction of the valve seat 200 and are spaced apart by the valve seat 200, the second inlet channel 171 and the second outlet channel 161 on the valve box 100 also have a certain dimensional interval in the aforementioned axial direction. This ensures that the second inlet channel 171 and the second outlet channel 161 do not intersect, so that the valve box 100 of the hydraulic end disclosed in this application embodiment does not have a cross intersection line, which can improve the service life of the valve box 100.

[0037] As described 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 a mounting cavity 110. The valve seat 200 is installed in the mounting cavity 110 of the valve box. Furthermore, in order to ensure that the first liquid inlet channel 220 can communicate with the second liquid inlet channel 171, in this embodiment of the 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, so as to ensure that the first liquid inlet channel 220 can communicate with the second liquid inlet channel 171 provided on the outer periphery of the mounting cavity 110 of the valve box.

[0038] As for the other end of the first liquid inlet channel 220 of the valve seat 200, it can be extended to the location of the liquid inlet valve assembly 310a, so that the liquid that enters 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.

[0039] Meanwhile, the first drain channel 240 of the valve seat 200 is used to connect the areas where the inlet valve assembly 310a and the drain valve assembly 310b are located respectively. As described above, in the hydraulic end disclosed in the embodiments of this application, the inlet valve assembly 310a and the drain valve assembly 310b are located outside the opposite ends of the valve seat 200. In this case, the first drain channel 240 can be provided to penetrate the valve seat 200 along the axial direction of the valve seat 200, so that the side where the first seat end face 213 of the valve seat 200 is located and the side where the second seat end face 214 is located can be connected through the first drain channel 240. More specifically, taking the axial direction of the valve seat 200 as the left-right direction, and the side where the first seat end face 213 is located as the left side of the valve seat 200, and the side where the second seat end face 214 is located as the right side of the valve seat 200, the first drainage channel 240 can connect the left and right sides of the valve seat 200. One of the inlet valve assembly 310a and the drainage valve assembly 310b is located on the left, and the other on the right, ensuring that liquid drawn into the area of ​​the inlet valve assembly 310a can flow through the first drainage channel 240 to the area of ​​the drainage valve assembly 310b. Furthermore, to prevent stress concentration in the valve seat 200, in the valve seat 200 disclosed in this embodiment, the first drainage channel 240 and the first inlet channel 220 do not intersect. This ensures that the valve seat 200 does not have a cross-shaped intersection line due to the intersecting channels, guaranteeing that the stress at different locations on the valve seat 200 is relatively dispersed, preventing the valve seat 200 from being easily damaged due to stress concentration.

[0040] Furthermore, a second drain channel 161 is provided on the valve box 100 at the position corresponding to the drain valve assembly 310b, so that liquid flowing into the area where the drain valve assembly 310b is located can be discharged outside the valve box 100 through the second drain channel 161, allowing the liquid to complete one intake and discharge cycle. During repeated intake and discharge cycles, liquid can be continuously drawn in through the second inlet channel 171 and discharged through the second drain channel 161.

[0041] More specifically, the power end 900 drives the aforementioned liquid inlet and liquid outlet operations to reciprocate by driving the plunger 400. Specifically, as the plunger 400 moves away from the liquid inlet valve assembly 310a, liquid is drawn in; as the plunger 400 moves towards the liquid inlet valve assembly 310a, liquid is discharged. That is, in the plunger 400 pump disclosed in this application embodiment, the plunger 400 is located on the side of the liquid inlet valve assembly 310a away from the valve seat 200, forming an alternating cavity AP 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. Therefore, one end of the mounting cavity 110 of the valve box 100 can extend to the surface of the side where the plunger 400 is located, allowing the plunger 400 to extend into the mounting cavity 110 and reciprocate relative to the valve box 100.

[0042] Of course, to ensure a reliable seal between the plunger 400 and the mounting cavity 110, the pump also includes a packing assembly 333 and other components. Specifically, the packing box 331 is fixedly installed on the side of the valve box 100 where the plunger 400 is located. More specifically, when there are multiple mounting cavities 110 in the valve box 100, there can also be multiple packing boxes 331, each corresponding to one of the mounting cavities 110. The packing box 331 also has a through cavity to accommodate the plunger 400. In other embodiments of this application, the packing box 331 can also have multiple through cavities, and the number of packing boxes 331 can be one, fixedly connected to the valve box 100, with each through cavity corresponding to one of the mounting cavities 110. In another embodiment of this application, the packing box 331 and the valve box 100 can be an integral structure. In this case, the structure makes the valve box 100 and the packing box 331 no longer have a clear boundary, and the two are only different in function.

[0043] Taking the packing box 331 and valve box 100 as a separate structure as an example, a sealing ring 334 is provided between the packing box 331 and the valve box 100. The sealing ring 334 is usually made of metal material to provide a seal for the connection surface between the packing box 331 and the valve box 100. A packing assembly 333 is provided on the side of the packing box 331 away from the valve box 100. It is used to provide a seal between the plunger 400 and the packing box 331. In order to ensure a stable fit between the packing assembly 333 and the packing box 331, a packing pressure cap 332 is provided on the outer side of the packing assembly 333. 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. The plunger 400 is connected to the power end 900 through the clamp.

[0044] As described above, since the valve seat 200, the inlet valve assembly 310a, and the outlet valve assembly 310b are all installed within the mounting cavity 110 of the valve box 100, and even a portion of the plunger 400 may be located within the mounting cavity 110 of the valve box 100, and since the second inlet channel 171 and the second outlet channel 161 of the valve box 100 are both interconnected with the mounting cavity 110 of the valve box 100, in order to ensure that the inlet and outlet processes can be carried out independently, when assembling the valve seat 200 and the valve... During the process of filling the valve box 100, it is necessary to ensure that the second liquid inlet channel 171 and the second liquid outlet channel 161 are isolated from each other, so as to ensure that the liquid entering the valve box 100 through the second liquid inlet channel 171 can only flow to 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 outlet valve assembly 310b is located can only flow out of the valve box 100 through the second liquid outlet channel 161, and will not flow back to the second liquid inlet channel 171.

[0045] To ensure that the second inlet channel 171 and the second outlet channel 161 are isolated from each other, related technologies use sealing rings at opposite ends of the valve seat 200 to form a sealing structure with the two sealing rings and the side of the valve seat 200, preventing direct exchange of liquids in the second inlet channel 171 and the second outlet channel 161. However, during pump operation, the flow of liquid may cause slight wobbling of the valve box 100 relative to the valve box 100, and the valve seat 200 may even rotate relative to the valve box 100. This can significantly affect the sealing reliability of the sealing rings at opposite ends of the valve seat 200, thus hindering the normal operation of the pump.

[0046] Therefore, in the valve seat 200 disclosed in this application embodiment, its connecting side 215 cooperates with a sealing ring or other structure to produce a sealing effect. More specifically, a first sealing element and a second sealing element are provided between the connecting side 215 and the cavity wall of the mounting cavity 110. In a first direction, the first sealing element and the second sealing element are respectively located on opposite sides of the second liquid inlet channel 171 of the valve box 100, thereby enabling the cavity wall of the mounting cavity 110, the first sealing element, the connecting side 215 and the second sealing element to form 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 ensuring that the second liquid outlet channel 161 is located outside the aforementioned sealed space, thus ensuring that the second liquid inlet channel 171 and the second liquid outlet channel 161 are mutually isolated.

[0047] As described above, the first drain channel 240 is provided through the valve seat 200 in the axial direction. Therefore, one of the opposite ends of the first drain channel 240 is located on the side of the first seal opposite to the second seal, and the other is located on the side of the second seal opposite to the first seal. This ensures that the second drain channel 161 is located outside the aforementioned sealing space, so that the second inlet channel 171 can form a good isolation relationship with the second drain channel 161.

[0048] As described above, in this embodiment, the first and second sealing elements used to provide a sealing effect are both sandwiched between the connecting side 215 of the valve seat 200 and the cavity wall of the mounting 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, the sealing effect of the first and second sealing elements will not be affected, thereby ensuring that the sealing fit between the valve seat 200 and the valve box 100 remains relatively stable.

[0049] To further improve the sealing reliability of the first and second seals, 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 mounting 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. Both the first and second seals are in sealing fit with the valve seat 200 and the valve box 100. Specifically, the inner side of each of the first and second seals is in sealing fit with the valve seat 200, and the outer side of each of the first and second seals is in sealing fit with the valve box 100.

[0050] To reduce manufacturing difficulty, more specifically, the first annular groove 216 can be entirely located on the outer peripheral surface (i.e., the connecting side 215) of the valve seat 200 or on the cavity wall of the mounting cavity 110 of the valve box 100. Correspondingly, the second annular groove 217 can also be entirely located on the outer peripheral surface (i.e., the connecting side 215) of the valve seat 200 or on the cavity wall of the mounting cavity 110 of the valve box 100. For example, the cavity wall of the mounting cavity 110 of the valve box 100 is provided with first annular grooves 216 and second annular grooves 217 spaced apart along the aforementioned axial direction.

[0051] In another embodiment of this application, such as Figure 14 and Figure 16As shown, the connecting side 215 of the valve seat 200 is provided with a first annular groove 216 and a second annular groove 217 spaced apart along the aforementioned axial direction. With the valve seat 200 having the first annular groove 216 and the second annular groove 217, since both are located on the outer surface of the valve seat 200, the machining difficulty of the first annular groove 216 and the second annular groove 217 can be reduced. Furthermore, in this case, the valve box 100 can be formed integrally, and by extending the mounting cavity 110 to the outer surface of the valve box 100, the assembly of the valve box 100 and the valve seat 217 can be facilitated. During the process, 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. Then, the valve seat 200 can be gradually pushed into the mounting cavity 110 from the opening on the outer surface of the valve box 100. As the valve seat 200 gradually enters the mounting cavity 110, the first seal and the second seal can be squeezed accordingly to ensure that the first seal and the second seal can form a squeezing fit with the cavity wall of the mounting cavity 110 respectively. This can further reduce the installation difficulty of the first seal and the second seal.

[0052] To prevent excessive annular grooves from negatively impacting the structural strength of the device, in another embodiment of this application, one of the first annular groove 216 and the second annular groove 217 is disposed on the valve seat 200, and the other is disposed on the valve box 100. For example, the valve seat 200 is provided with the first annular groove 216, and the cavity wall of the mounting cavity 110 of the valve box 100 is provided with the second annular groove 217. Correspondingly, 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.

[0053] To reduce the overall machining difficulty of the valve seat 200 and valve box 100 in the hydraulic end, in a further embodiment of this application, the axes of different parts in the connecting side 215 can be arranged collinearly. Of course, in the design of the valve box 100, it is also necessary to ensure that the axes of different parts in the cavity wall of the mounting cavity 110 of the valve box 100 are also collinearly arranged accordingly, so as to ensure that the valve seat 200 can be installed more accurately in the corresponding position in the mounting 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 tightness of the fit between the valve seat 200 and the valve box 100.

[0054] This application discloses a hydraulic end, which includes a valve box 100, a valve seat 200, a valve assembly, and a plunger 400. The valve box 100 is provided with a mounting cavity 110, which extends through the valve box 100 in a first direction. In this application embodiment, the mounting cavity 110 or its extension direction is used to mount the valve seat 200, the valve assembly, and the plunger 400. That is, in the hydraulic end disclosed in this application embodiment, the valve seat 200 can provide a flow path for the liquid. Since the valve seat 200, the valve assembly, and the plunger 400 are all located in the extension direction of the mounting cavity 110, the liquid inlet and outlet processes in the hydraulic end can be affected by the location of the valve assembly.

[0055] More specifically, in the hydraulic terminal disclosed in this application embodiment, the valve assembly includes an inlet valve assembly 310a and a outlet valve assembly 310b, which open during the inlet and outlet processes, respectively, and conversely, close during the outlet and inlet processes, respectively. In the hydraulic terminal disclosed in this application embodiment, the inlet valve assembly 310a and the outlet valve assembly 310b are located at opposite ends of the valve seat 200. This ensures that the inlet and outlet paths of the hydraulic terminal are located at opposite ends of the valve seat 200. Under these circumstances, the second inlet channel 171 and the second outlet channel 161 in the valve box 100, which provide inlet and outlet functions respectively, do not intersect each other. Therefore, the valve box 100 of the hydraulic terminal disclosed in this application embodiment no longer has a cross-shaped intersection line, which can improve the overall service life of the valve box 100.

[0056] As described above, the valve seat 200 is provided with a first liquid inlet channel 220. Optionally, the valve seat 200 has only one first liquid inlet channel 220. In order to further improve the liquid inlet efficiency of the valve seat 200, in other embodiments of this application, the number of first liquid inlet channels 220 can be multiple. Of course, in order to ensure that each first liquid inlet channel 220 can be connected to the second liquid inlet channel 171 on the valve box 100, the first port 221 of each of the multiple first liquid inlet channels 220 is located on the connecting side 215. More specifically, the first ports 221 of the multiple first liquid inlet channels 220 can be distributed circumferentially at intervals along the connecting side 215.

[0057] As described above, the second liquid inlet channel 171 on the valve box 100 is located on the outer periphery of the mounting cavity 110. Therefore, when there are multiple first liquid inlet channels 220 on the valve seat 200, there can also be multiple second liquid inlet channels 171 on the valve box 100, and each first liquid inlet channel 220 of the valve seat 200 installed in a certain mounting 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 the design difficulty, in a specific embodiment of this application, each mounting cavity 110 in the valve box 100 can be correspondingly provided with one or two second liquid inlet channels 171.

[0058] When the number of second liquid inlet channels 171 corresponding to any mounting cavity 110 is less than the number of first liquid inlet channels 220 installed in the valve seat 200 in the mounting cavity 110, a communicating cavity can be formed between the connecting side 215 and the cavity wall of the mounting cavity 110 by recessing the area where the first port 221 is located in the connecting side 215. When the aforementioned recessed area of ​​the connecting side 215 is arranged around the entire cavity, each first liquid inlet channel 220 and each second liquid inlet channel 171 can communicate with the aforementioned communicating cavity, ensuring that the liquid entering the aforementioned communicating cavity through the second liquid inlet channel 171 can flow into different first liquid inlet channels 220 respectively.

[0059] It should be noted that, in the embodiments of this application, since the number of second liquid inlet channels 171 corresponding to any mounting cavity 110 is less than the number of first liquid inlet channels 220 of the valve seat 200 installed in the mounting cavity 110, when one or more of the multiple first liquid inlet channels 220 are directly opposite one or more of the second liquid inlet channels 171, it is objectively impossible for the remaining one or more of the multiple first liquid inlet channels 220 to be directly opposite the other second liquid inlet channels 171.

[0060] Based on the above, in order to improve the liquid inlet efficiency of each first liquid inlet channel 220, optionally, multiple first ports 221 are distributed circumferentially at intervals along the connecting side 215. This can improve the dispersion of the multiple first liquid inlet channels 220, thereby ensuring that the liquid inlet efficiency of one or more first liquid inlet channels 220 that are not directly opposite the second liquid inlet channel 171 is also relatively high. In a further embodiment of this application, multiple first liquid inlet channels 220 are uniformly arranged in the direction surrounding the axial direction of the valve seat 200 (i.e., the circumferential direction of the connecting side 215), which can further improve the structural reliability of the valve seat 200.

[0061] Furthermore, when there are multiple second liquid inlet channels 171, they can be evenly arranged in the direction surrounding the axial direction of the valve seat 200. For example, when the valve seat 200 is generally cubic in shape, in a specific embodiment of this application, a second liquid inlet channel 171 can be provided above and below any mounting cavity 110, wherein the aforementioned distribution direction above and below is specifically the second direction, i.e., direction Y in the figure. Of course, when 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 the cross-sectional area and other parameters of the second liquid inlet channel 171, it can also be ensured to a certain extent that one second liquid inlet channel 171 can supply liquid to multiple first liquid inlet channels 220 relatively efficiently. In addition, the extension direction of the second liquid inlet channel 171 can be parallel to the second direction, or it 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 mounting cavities 110, and to 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.

[0062] To more clearly illustrate the above technical solution, in detail, in the hydraulic end disclosed in the embodiments of this application, the valve box 100 has a first box end face 131 and a second box end face 132, wherein, in a 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 correspondingly, the mounting cavity 110 extends from the first box end face 131 to the second box end face 132 along the first direction.

[0063] Meanwhile, 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. In the second direction, the fourth box end face 134 and the third box end face 133 are located at opposite ends of the valve box. As shown above, the second direction is not parallel to the first direction. Optionally, the second direction is perpendicular to the first direction. Alternatively, the two can also have an inclination angle, and the aforementioned inclination angle is not 0° and not 90°.

[0064] Based on the above, the valve box 100 is provided with multiple second liquid inlet channels 171 and multiple mounting cavities 110. The multiple mounting cavities 110 are arranged at intervals along a third direction, wherein the third direction is not parallel to the first direction and is not parallel to the second direction. Furthermore, in the hydraulic end disclosed in the embodiments of this 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 a third box end face 133 or a fourth box end face 134.

[0065] 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 circumferentially along the connecting side 215. Optionally, the first drainage channel 240 has a curved extension structure. To improve the drainage efficiency of the first drainage channel 240, in a specific embodiment of this application, the first drainage channel 240 has a straight structure. As mentioned above, the first drainage channel 240 can provide communication between the inlet valve assembly 310a and the drain valve assembly 310b on opposite sides of the valve seat 200. Therefore, in a specific embodiment of this 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 all parallel to each other and all parallel to the straight line where the axial direction of the valve seat 200 lies.

[0066] To improve the space utilization of the valve seat 200, in another embodiment of this application, the extending direction of the first drain channel 240 can be inclined relative to the axial direction of the valve seat 200. In this case, the extending directions of the multiple first drain channels 240 may no longer be parallel to each other, but overall, the multiple first drain channels 240 can still be distributed at intervals along the direction surrounding the axial direction of the valve seat 200. Of course, when there are multiple first inlet channels 220 and multiple first drain channels 240, no two first inlet channels 220 and no two first drain channels 240 intersect each other to ensure that the valve seat 200 does not form a cross intersection line, thereby improving the overall service life of the valve seat 200.

[0067] As described above, in the hydraulic end of the pump, along the axial direction of the valve seat 200, an inlet valve assembly 310a and a outlet valve assembly 310b are respectively provided outside the opposite ends of the valve seat 200. In order to increase the liquid capacity in the area outside the opposite ends of the valve seat 200 and improve the fit between the valve seat 200 and the valve assembly, in a specific embodiment of this 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 face 213. The first mating concave surface 251 is used to mate with the valve assembly. For example, if the first seat end face 213 is located on the side of the valve seat 200 facing the inlet valve assembly 310a, then the first mating concave surface 251 is used to mate with the inlet valve assembly 310a.

[0068] More specifically, during the liquid inlet process, the plunger 400 moves away from the valve seat 200, allowing it to draw liquid from the second liquid inlet channel 171. This causes the liquid to flow along the second liquid inlet channel 171 through the first liquid inlet channel 220 to the area where the liquid inlet valve assembly 310a is located, during which the liquid inlet valve assembly 310a opens. Correspondingly, during the liquid outlet process, the plunger 400 moves towards the valve seat 200, allowing it to push the liquid in the area where the liquid inlet valve assembly 310a is located. This drives the liquid through the first liquid outlet channel 240 to the area where the liquid outlet valve assembly 310b is located, opening the liquid outlet valve assembly 310b and allowing the liquid to be discharged through the second liquid outlet channel 161 to the outside of the valve box 100.

[0069] Optionally, the axis of the first mating concave surface 251 is not collinear with the axis of the connecting side surface 215. For example, the two may have an angle greater than 0° and less than 90°. Alternatively, in another embodiment of this application, the axis of the first mating concave surface 251 may be parallel to and not collinear with the axis of the connecting side surface 215. In this case, the liquid inlet valve assembly 310a and the valve seat are misaligned.

[0070] In order to improve the fitting accuracy between the valve assembly that mates with the first mating concave surface 251 and the valve seat 200, and to reduce the decrease in flow rate of the liquid due to changes in direction or translation during the flow process, in another embodiment of this application, the axis of the first mating concave surface 251 can be collinear with the axis of the connecting side surface 215 to improve the liquid exchange efficiency.

[0071] Furthermore, a mating concave surface may also be provided on one side of the second seat end face 214 in the valve seat 200. Specifically, the mating concave surface is a second mating concave surface 252, and the second mating concave surface 252 is recessed relative to the second seat end face 214. This allows the valve seat 200 to 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 of the valve seat 200 and the valve assembly on the side where the second mating concave surface 252 is located to a certain extent.

[0072] Similarly, the axis of the second mating concave surface 252 can also be non-collinear with the axis of the connecting side surface 215. In another embodiment of this application, in order to further improve the liquid exchange efficiency, the axis of the second mating concave surface 252 can be collinear with the axis of the connecting side surface 215.

[0073] When the valve seat 200 has a first mating concave surface 251 and a second mating concave surface 252 at opposite ends, the number of the first liquid inlet channel 220 and the second liquid inlet channel 171 can be multiple. The first port 221 of each of the multiple first liquid inlet channels 220 extends to the connecting side 215, and the other port of each 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 in the aforementioned central area of ​​the valve seat 200 close to the first mating concave surface 251 so that one port of each of the multiple first liquid inlet channels 220 can communicate with 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, thereby further improving the liquid inlet efficiency.

[0074] Meanwhile, one end of each of the multiple second liquid inlet channels 171 can extend to the first seat end face 213. Since the central region of the valve seat 200 has the aforementioned cavity near the first mating concave surface 251, the aforementioned ports of the multiple second liquid inlet channels 171 can be located in a relatively outer region of the first seat end face 213. This makes the dispersion between the first liquid inlet channel 220 and the first liquid outlet channel 240 relatively stronger, further improving the structural stability of the valve seat 200 and minimizing the mutual interference between the liquid inlet and liquid outlet processes. Furthermore, each first liquid outlet channel 240 can extend obliquely relative to the axial direction of the valve seat 200, so that the other end of each first liquid outlet channel 240 (denoted as the second port 241) can extend to the central region of the second mating concave surface 252 and communicate with the liquid outlet valve assembly 310b located on the side of the second mating concave surface 252.

[0075] Based on the valve seat 200 disclosed above, the hydraulic end disclosed in this application embodiment, as above, includes a mounting cavity 110, a second inlet channel 171, and a second outlet channel 161 in the valve box 100. The valve seat 200 can be installed in the mounting cavity 110 of the valve box 100, with the second inlet channel 171 communicating with the first inlet channel 220 and the second outlet channel 161 communicating with the first outlet channel 240. Of course, the hydraulic end may also include the first and second sealing elements described above for providing a sealing effect between the valve seat 200 and the valve box 100. Additionally, the hydraulic end may also include an inlet valve assembly 310a and an outlet valve assembly 310b.

[0076] More specifically, as described above, the valve seat 200 is installed in the mounting cavity 110 of the valve box 100. In order to ensure that the valve seat 200 can be installed in the mounting cavity 110, the valve box 100 may optionally include two symmetrically arranged structures, and the two structures are connected and fixed to each other to form the mounting cavity 110. Thus, the valve seat 200 can be installed in one of the structures first, and then the two structures can be fixedly connected to ensure that the valve seat 200 can be installed in the mounting cavity 110.

[0077] To improve the structural reliability and sealing performance of the valve box 100, in another embodiment of this application, the mounting cavity 110 is disposed through the valve box 100 along the axial direction of the valve seat 200. That is, in the first direction, the mounting cavity 110 is disposed through the valve box 100. In other words, the mounting cavity 110 extends from one end face of the valve box 100 to the other end face of the valve box 100 along the first direction. At the same time, by making the size of the opening of the mounting cavity 110 on at least one end face of the valve box larger than the maximum diameter of the valve seat 200, it can also be ensured that the valve seat 200 can be installed in the mounting cavity 110 of the valve box through the aforementioned opening. Accordingly, in the hydraulic end disclosed in the embodiments of this application, the mounting cavity or the extension 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 distributed sequentially.

[0078] Of course, after the valve seat 200 is installed in the mounting cavity 110, in order to ensure that the mounting cavity 110 can still form a sealed environment, the hydraulic end may also include structures such as a discharge cap 341 and a discharge cover 342. The discharge cover 342 is located on the side of the discharge valve assembly 310b away from the valve seat 200, and the discharge cover 342 is fixed relative to the valve box 100. The discharge cap 341 is installed on the side of the discharge cover 342 away from the discharge valve assembly 310b, and the discharge cap 341 can be connected to the valve box 100 by threads to form a relatively reliable fixed relationship between the discharge cap 341 and the valve box 100. Of course, a sealing ring may be provided between the discharge cover 342 and the valve box 100 to ensure a relatively reliable sealing effect between the two.

[0079] As described above, the valve box 100 is provided with a drainage channel, specifically a second drainage channel 161, which is connected to the mounting cavity 110. Since a plunger 400 and a discharge cap 341 are respectively located at opposite ends of the mounting cavity 110, in this embodiment, to ensure that the second drainage channel 161 can communicate with the mounting cavity 110, it is necessary to position the second drainage channel 161 around the mounting cavity 110. In other words, the second drainage channel 161 is not located at either end of the mounting cavity along its own extending direction; or, the second drainage channel 161 is located on one side of the mounting cavity. In this case, by making the extending direction of the second drainage channel 161 non-parallel to the first direction, it can be ensured that the liquid entering the mounting cavity can be normally discharged out of the valve box 100 through the second drainage channel 161. That is, in the embodiments of this application, the extension direction of the second drainage channel 161 and the extension direction of the mounting cavity 110 can be perpendicular to each other, or they can have a relative tilt angle α, and 0° < α < 90°.

[0080] Since the mounting cavity 110 contains structures such as a valve seat 200 and a valve assembly, and in order to ensure that the mounting cavity 110 can communicate with the second drain channel 161, it is necessary to ensure that the mounting cavity 110 and the second drain channel 161 have overlapping portions. Obviously, the valve seat 200, the drain valve assembly 310b, and the drain cap 342 may occupy at least a portion of the aforementioned overlapping space, which will hinder the draining efficiency of the second drain channel 161. Based on this, in order to minimize the weakening effect of the devices disposed in the mounting cavity 110 on the draining efficiency of the second drain channel 161, in a specific embodiment of this application, such 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 greater than 0. With this technical solution, the part of the second drainage channel 161 located outside the mounting cavity 110 can always be unoccupied by the device set in the mounting cavity, thereby ensuring that the second drainage channel 161 has relatively good drainage efficiency.

[0081] It should be noted that the mounting cavity 110 described above is essentially the area within the mounting cavity 110 that communicates with the drainage channel. Therefore, more precisely, in this embodiment, the minimum distance between the portion of the mounting cavity 110 communicating with the second drainage channel 161 and the inner wall of the second drainage channel 161 away from the axis of the mounting cavity 110 is greater than 0. More intuitively, as... Figure 6 As shown in the figure, and taking the orientation shown in the figure as an example, in the hydraulic end disclosed in this application embodiment, the minimum distance M between the upper edge of the second drain channel 161 and the upper edge of the portion of the mounting cavity that communicates with the second drain channel 161 is greater than 0.

[0082] Furthermore, the radial dimension of the mounting cavity 110 is typically larger than the radial dimension of the second drain channel 161. Therefore, in one specific embodiment of this application, the axis of the second drain channel 161 may be located outside the mounting cavity 110. Figure 6 As shown, the axis of the second drain channel 161 can be positioned above the mounting cavity 110. To improve the overall compactness of the valve box 100, in one specific embodiment of this application, the upper edge of the mounting cavity 110 can be flush with the axis of the second drain channel 161. Alternatively, the upper edge of the mounting cavity 110 can extend slightly above the axis of the second drain channel 161. However, in this case, the distance between the upper edge of the mounting cavity 110 and the axis of the second drain channel 161 must be less than half the radius of the second drain channel 161. In one specific embodiment of this application, the distance N between the axis of the mounting cavity 110 and the axis of the second drain channel 161 can be equal to or greater than 50 mm.

[0083] As described above, the mounting cavity 110 of the valve box 100 is usually also provided with a drain valve and a discharge cap 342. In order to further reduce the impact of the drain valve assembly 310b and the discharge cap 342 on the drainage efficiency of the second drain channel 161, in a specific embodiment of this application, during the operation of the hydraulic end, the maximum area of ​​the second drain channel 161 invaded by the drain valve assembly 310b and the discharge cap 342 is less than or equal to 80% of the drainage area of ​​the second drain channel 161.

[0084] As described above, since the second drain channel 161 is connected to the mounting cavity 110 and is located around the mounting cavity 110, there must be an overlapping area between them. At the same time, since the drain valve assembly 310b and the discharge cap 342 are both installed in the mounting cavity 110 of the valve box 100, and the second drain channel 161 needs to correspond to the area where the drain valve assembly 310b and the discharge cap 342 are located, the drain valve assembly 310b and the discharge cap 342 will occupy the overlapping area of ​​the second drain channel 161 with the mounting cavity when they are accommodated in the mounting cavity 110. The aforementioned area is the area of ​​the second drain channel 161 invaded by the drain valve assembly 310b and the discharge cap 342 during the operation of the hydraulic end. Of course, the aforementioned area refers to the area occupied by the second drain channel 161 in the planar figure intercepted by a plane perpendicular to its own axis, that is, the drain section of the second drain channel 161.

[0085] As described above, the valve box 100 has a first box end face 131 and a second box end face 132. During the operation of the hydraulic end, the plunger 400 can reciprocate linearly relative to the valve box. One end of the plunger 400 is also used to connect to the power end 900. Therefore, in the hydraulic end disclosed in the embodiments of this application, a part 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 where the first box end face 131 of the valve box 100 is located.

[0086] In addition, as mentioned above, a sealed connection 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 them. The first seal and the second seal are located on opposite sides of the second liquid inlet channel 171 of the valve box 100, so that a good sealing relationship is formed between the first liquid inlet channel 220 of the valve seat 200 and the second liquid inlet channel 171 of the valve box 100.

[0087] Meanwhile, the valve box 100 can also form a sealed connection with the packing box 331 through the sealing ring. Of course, the sealing ring is also arranged around the plunger 400, so that the valve box 100, the packing box 331 and the plunger 400 can all form a sealed fit relationship through the sealing ring.

[0088] The cavity wall in the valve housing 100 that mates with the second seal is part of the inner wall of the mounting cavity 110, specifically the first sealing ring surface 111. The cavity wall in the valve housing 100 that mates with the sealing ring is also part of the inner wall of the mounting cavity 110, specifically the second sealing ring surface 112. Correspondingly, in the first direction, the first sealing ring surface 111 is relatively closer to the first housing end face 131, and the second sealing ring surface 112 is relatively closer to the second housing end face 132. Of course, the cavity wall of the mounting cavity 110 also includes other parts. 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 inlet valve assembly 310a, and may even be used to accommodate a portion of the valve seat 200.

[0089] That is, in the hydraulic end disclosed in the embodiments of this 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 face 131, and the second sealing ring surface 112 is adjacent to the second box end face 132.

[0090] Furthermore, in the hydraulic end disclosed in this application embodiment, the connecting ring surface 113 is an annular closed surface. That is, in the valve box 100 of the hydraulic end disclosed in this application embodiment, the connecting ring surface 113 located between the first sealing ring surface 111 and the second sealing ring surface 112 is not provided with an opening. This makes the sealing effect and sealing reliability of the connecting ring surface 113 relatively high. In addition, when adopting the technical solution disclosed in this application embodiment, the strength and fatigue resistance of the part of the valve box 100 where the connecting ring surface 113 is located are also relatively good. This prevents cracking and other phenomena from occurring in the part of the valve box 100 where the connecting ring surface 113 is located during the reciprocating motion of the plunger 400 relative to the valve box 100 and the process of driving the liquid to be sucked in and discharged in a cycle, thereby improving the service life of the entire valve box 100.

[0091] As described above, the valve box 100 is provided with a mounting cavity 110, and the mounting cavity 110 or its extension direction is used to mount devices such as the valve seat 200. In order to further improve the working efficiency of the hydraulic end, in a specific embodiment of this application, the valve box 100 may be provided with multiple mounting cavities 110, and any mounting cavity 110 or its extension direction may be used to mount devices such as the valve seat 200, the inlet valve assembly 310a, the outlet valve assembly 310b, and the plunger 400.

[0092] Furthermore, since the hydraulic end, including the valve box 100, typically needs to be used in conjunction with other mechanisms such as the power end 900, the hydraulic end disclosed in this application embodiment can have multiple through holes 120 on the outer periphery of the mounting cavity 110 provided on the valve box 100. Connecting bolts can be installed in the through holes 120 of the valve box 100, thereby allowing the hydraulic end to be fixedly connected to the power end 900 and other mechanisms via connecting bolts. In the case of this application embodiment, the through holes 120 provided through the valve box 100 enable the connecting bolts to provide a relatively stronger connection effect to the valve box 100. Therefore, even if the weight and other parameters of the valve box and other components are relatively large, and the vibration generated during operation is relatively severe, the assembly stability between the valve box 100 and other mechanisms 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 this application, the outer periphery of the mounting cavity 110 can have four through holes 120. Optionally, the outer periphery of the mounting cavity may be provided with multiple packing mounting holes 180 to facilitate the assembly process between the valve box and the packing box 331.

[0093] As described above, the mounting cavity 110 of the valve box 100 extends from the first end face 131 of the valve box 100 to the second 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 extend from the first end face 131 to the second end face 132 in the first direction to penetrate the valve box. This makes the length of the connecting bolt used to mate 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.

[0094] Considering that the mounting cavity 110 in the valve box 100 has multiple through holes 120 on its outer periphery, and each of the multiple through holes 120 can be used to install connecting bolts, and furthermore, as mentioned above, the valve box 100 may also include multiple mounting cavities 110, and each mounting cavity 110 may have multiple connecting bolts on its outer periphery. In this case, the 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. Therefore, for each connecting bolt, it is only necessary that it has an appropriate length.

[0095] Furthermore, in another embodiment of this application, a groove can be formed on the surface of the valve box 100 so that the through hole 120 can penetrate a portion of the valve box without requiring an excessively large axial dimension, thereby ensuring that the connecting bolt can also be installed normally. Specifically, in this embodiment, the portion of the valve box 100 located between the first end face 131 and the second end face 132 is provided with a relief groove 140. The relief groove 140 is recessed from the surface of the valve box, and the through hole 120 extends from the second end face 132 to the relief groove 140, thereby ensuring that the connecting bolt can still be inserted into the through hole, and that one of the opposite ends of the connecting bolt protrudes from the second end face 132, while the other protrudes from the relief groove 140. This ensures that the connecting bolt can be properly connected to other mechanisms such as the power end 900 and the mating nut, wherein the connecting bolt and the connecting nut constitute a threaded connector 510.

[0096] Based on the technical solutions disclosed in the embodiments of this application, when the valve box 100 has multiple mounting cavities 110, the aforementioned clearance groove 140 can be provided at the corresponding position of each mounting cavity 110. In this case, the clearance groove 140 can extend continuously along the distribution direction of the multiple mounting cavities 110. In another embodiment of this application, the number of clearance grooves 140 can also be multiple, and a rib can be formed between any two adjacent clearance grooves 140 in the distribution direction of the multiple mounting cavities 110. This can improve the connection reliability between the portions of the valve box 100 located on opposite sides of the clearance grooves 140 along the first direction, thereby further improving the service life of the valve box 100.

[0097] As described above, the valve box 100 can be provided with multiple mounting cavities 110. In this case, each mounting cavity needs to be correspondingly provided with a second liquid inlet channel 171 and a second liquid outlet channel 161. In order to facilitate the interconnection between the valve box and the external pipeline, the multiple second liquid inlet channels 171 and multiple second liquid outlet channels 161 provided on the valve box 100 can be distributed relatively regularly. For example, the second liquid inlet channels 171 can be correspondingly provided directly above each mounting cavity 110. This allows the multiple second liquid inlet channels 171 to be arranged at intervals along the distribution direction of the multiple mounting cavities. In this case, the liquid inlet manifold can be connected to the multiple second liquid inlet channels 171 at the same time, so that the sucked liquid can be transported to the multiple 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 multiple second liquid inlet channels 171 located below the mounting cavities can also be interconnected through another liquid inlet manifold to improve the liquid inlet efficiency and improve the space utilization of the valve box 100.

[0098] To minimize the volume and weight of the hydraulic end and to ensure its relatively regular shape for easy transportation and installation, in one specific embodiment of this application, multiple mounting cavities 110 can be arranged in a straight line, and their opposite ends can be flush in the extending direction of the mounting cavities 110, i.e., in the axial direction (or first direction) of the valve seat 200. For example... Figure 6 As shown in a specific embodiment of this application, any valve box 100 may be provided with multiple mounting cavities 110, and each mounting cavity 110 is disposed through the valve box 100 along a first direction. The multiple mounting cavities 110 may be distributed at intervals in a third direction, that is, the distribution direction of the multiple mounting cavities 110 may be a third direction. In order to improve the space utilization rate in the valve box 100, in this embodiment of the application, the third direction may be perpendicular to the first direction (i.e., the axial direction of the valve seat 200). Furthermore, any two of the first direction, the second direction, and the third direction may be perpendicular to each other. This can maximize the regularity of the shape of the hydraulic end and minimize the overall volume of the hydraulic end. In this case, the inlet manifold and the flow collector may both extend along the third direction, so that the overall regularity of the hydraulic end is relatively good, and the overall volume of the hydraulic end is further reduced, improving the storage and transportation efficiency of the hydraulic end. Intuitively, the third direction may be the direction Z in the figure.

[0099] Similarly, the second drainage channels 161 corresponding to each of the multiple mounting cavities 110 can also be regularly distributed. Optionally, in a specific embodiment of this application, the second drainage channel 161 can be provided at another position above each mounting cavity 110, and the multiple second drainage channels 161 are also arranged at intervals along the distribution direction of the multiple mounting cavities 110. Based on this, the hydraulic end disclosed in the embodiments of this application may also include a flow collector, which has a flow collecting cavity and multiple liquid inlets. The multiple liquid inlets are distributed at intervals along the length direction of the adapter plate, and any liquid inlet can communicate with the corresponding second drainage channel 161, so that the liquid discharged through the multiple second drainage channels 161 can be collected into the flow collecting cavity of the flow collector.

[0100] Meanwhile, to facilitate the transport of liquid in the manifold, in this embodiment, a drain port can be provided at one end of the manifold cavity, and a discharge flange 320 can be installed 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. In addition, a tee 360 ​​can be provided at the other end of the manifold cavity to further improve the controllability of the liquid transport path.

[0101] More specifically, the valve box 100 may also have a fifth end face 135 and a sixth end face 136. In this case, the valve box 100 has an overall cubic structure. It should be noted that the valve box is not necessarily a regular cubic structure, but rather roughly similar to a cubic structure. Specifically, regarding the outer surface of the valve box, the first end face 131, the third end face 133, the second end face 132, and the fourth end face 134 are connected sequentially to form a cylindrical structure. The fifth end face 135 and the sixth end face 136 are respectively located at opposite ends of the aforementioned cylindrical structure. Based on this, one of the discharge flange 320 and the tee 360 ​​can be located on the fifth end face 135, and the other can be located on the sixth end face 136.

[0102] As described above, during the operation of the pump, the valve seat 200 may experience slight shaking or movement relative to the valve box 100 due to the driving effect of the liquid flow. Therefore, in order to improve the service life of the valve seat 200, in a specific embodiment of this 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 seats 200 and the valve seat 200. Of course, the hardness of the wear-resistant ring 640 is greater than that of the valve seat 200, and / or the wear resistance of the wear-resistant ring 640 is greater than that of the valve seat 200. Thus, by utilizing the friction between the wear-resistant ring 640 and the cavity wall of the mounting cavity 110 of the valve box 100, the friction area between the valve seat 200 and the valve box 100 is reduced, thereby improving the service life of the valve seat 200. Of course, when a wear-resistant ring 640 is fitted over the valve seat 200, it is also necessary to ensure that the inner side of the wear-resistant ring 640 is sealed to the valve seat 200 and the outer side of the wear-resistant ring 640 is sealed to the valve box 100. More specifically, a first sealing element can be provided between the inner side of the wear-resistant ring 640 and the valve seat 200, and a third sealing element can be provided between the outer side of the wear-resistant ring 640 and the valve box 100. Furthermore, the valve seat 200 can be provided with a first annular groove 216, and the cavity wall of the mounting cavity 110 can be provided with another annular groove to provide installation and limiting functions for the first and third sealing elements, respectively, further improving the sealing reliability among the three.

[0103] As described above, the valve seat 200 is provided with an inlet valve assembly 310a and a outlet valve assembly 310b at opposite ends. Since the inlet process is driven by the suction of the plunger 400, the flow rate of the liquid in the second inlet channel 171 and the first inlet channel 220 is relatively slow when entering the area of ​​the inlet valve assembly 310a. However, during the outlet process, the liquid is pushed by the plunger 400, resulting in relatively high pressure and flow rate of the liquid in the area of ​​the outlet valve assembly 310b when it is discharged through the second outlet channel 161 to the outside of the valve box 100. Simultaneously, since the outlet valve assembly 310b typically includes a valve body and a valve sleeve, and the valve body forms a sealed fit with the valve seat 200 through the valve sleeve, the valve sleeve is used to seal the mating surface between the valve body and the valve seat 200. Furthermore, during the outlet process, the valve sleeve is subjected to the squeezing action of the high-pressure liquid.

[0104] Therefore, if the valve is damaged, the liquid flowing into the second drain channel 161 will invade the valve and flow at high speed towards the mating surface of the valve seat facing the valve body, thereby eroding the mating surface of the valve seat facing the valve body (i.e., 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 drain channel 161 is located to connect with the low-pressure chamber LP where the second inlet channel 171 is located, thereby generating high and low chamber cross pressure, causing the manifold to burst, which seriously affects the personal safety of the staff.

[0105] Therefore, in one specific embodiment of this 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 contact surface between the valve seat 200 and the valve body, so as to prevent the liquid in the high-pressure chamber HP from directly eroding the valve seat 200 in the event of damage to the valve rubber of the drain valve assembly 310b. Of course, since the end of the valve seat 200 facing the drain valve assembly 310b is also provided with a second port 241 of the first drain channel 240, in order to prevent the protective plate 620 from hindering the normal operation of the drain channel 240, the protective plate 620 needs to be provided with a clearance opening or other structure to avoid the first drain channel 240.

[0106] Meanwhile, to ensure that the valve seat 200 and the drain valve assembly 310b can still form a normal mating relationship when the protective plate 620 is provided on the side of the valve seat 200 facing the drain valve assembly 310b, at least one of the valve body of the drain valve assembly 310b and the valve seat 200 can be provided with a receiving groove 230 to provide 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 setting of the receiving groove 230 from having a significant adverse effect on the structural strength of the valve body, in a specific embodiment of this 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 mating concave surface 2. 52. In this case, the receiving groove 230 can be located in the central area of ​​the second mating concave surface 252, and the receiving groove 230 can be further recessed relative to the second mating concave surface 252. The second port 241 of the first drain channel 240, that is, the end of the first drain channel 240 away from the first seat end face 213, is connected to the receiving groove 230. In other words, the first seat end face 213 is connected to the receiving groove 230 through the first drain channel 240. That is, the first drain channel 240 extends from the first seat end face 213 to the receiving groove 230, ensuring that the liquid flowing out through the first drain channel 240 can flow through the receiving groove 230 to the area where the drain valve assembly 310b is located, and finally be discharged to the outside of the valve box 100 through the second drain channel 161.

[0107] More in detail, such as Figure 7As shown, the protective plate 620 includes a bridging portion 621 and at least one shielding rib 622. Each shielding rib 622 is connected to the outside of the bridging portion 621. That is, in the hydraulic end disclosed in the embodiments of this application, the bridging portion 621 is used to provide assembly for the shielding rib 622. Of course, when there is only one shielding rib 622, there may be no obvious boundary between the bridging portion 621 and the shielding rib 622 in terms of structure. However, when there are multiple shielding ribs 622, the portion located at the center of the multiple shielding ribs 622 can be the bridging portion 621.

[0108] After the protective plate 620 is installed in the receiving groove 230, the main protective function for the valve seat 200 is provided by the shielding rib 622. Therefore, the shielding rib 622 needs to avoid the first drainage channel 240. That is, in the circumferential direction of the connecting side 215, that is, in the axial direction around the valve seat 200, the shielding rib 622 is sandwiched between the first drainage channels 240. Of course, if there is only one first drainage channel 240 on the valve seat 200, the number of shielding ribs 622 can also be one, and the shielding rib 622 extends 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°, then the angle spanned by the shielding rib 622 can be 270°. In addition, in the above embodiments, the valve seat 200 may be provided with a plurality of first drainage channels 240. In this case, the number of shielding ribs 622 may also be a plurality, and the first drainage channels 240 and shielding ribs 622 are alternately distributed in the axial direction surrounding the valve seat 200, so that each shielding rib 622 can shield the area of ​​the second port 241 in the valve seat 200 where no first drainage channel 240 is provided.

[0109] Specifically, the protective plate 620 can be formed of a metal material. To further improve the protective effect of the protective plate 620, in another embodiment of this 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 improved, thereby further enhancing the protective effect of the protective plate 620 on the valve seat 200. More specifically, in a specific embodiment of this application, the forming material of 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 ceramics. This allows the protective plate 620 to have relatively high strength and wear resistance while having relatively low cost and relatively low processing difficulty.

[0110] As described above, the bridging portion 621 is located in the central region of the shielding rib 622. Optionally, the bridging portion 621 is a plate-shaped, non-perforated structure, meaning that the opposite sides of the bridging portion 621 cannot communicate with each other. Since the mating surface between the valve body in the drain valve assembly 310b and the valve seat 200 cannot directly extend to the center of the valve seat 200, in another embodiment of this application, a through hole 621a can be provided in the center of the bridging portion 621. The presence of the through hole 621a does not significantly compromise the overall shielding effectiveness of the protective plate 620. The through hole 621a can be a circular hole, and it extends through the bridging portion 621 along its thickness direction. In this case, on the one hand, it facilitates the processing and transportation of the entire protective plate 620; on the other hand, it reduces the weight of the entire protective plate 620, thereby appropriately reducing the weight of the entire hydraulic end.

[0111] In addition, in the above embodiments, the valve seat 200 may also be provided with a second mating concave surface 252, which is recessed relative to the second seat end face 214. The valve body of the drain valve assembly 310b can be fitted with the second mating concave surface 252. When the valve seat 200 is provided with a receiving groove 230, the second mating concave surface 252 is connected between the second seat end face 214 and the receiving groove 230. Therefore, during the formation of the second mating concave surface 252, the extension position and extension direction of the second mating concave surface 252 can be designed so that when the second mating concave surface 252 extends to the side where the receiving groove 230 is located, it can face the shielding rib 622 of the protective plate 620. Thus, when the valve rubber of the drain valve assembly 310b is damaged, causing the liquid in the high-pressure chamber to erode along the second mating concave surface 252 towards the location of the receiving groove 230, 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, thereby further improving the service life of the valve seat 200 and enhancing the safety of the entire pump.

[0112] As described above, the protective plate 620 can be installed in the receiving groove 230. Optionally, the protective plate 620 is fixedly connected to the valve seat 200 by bolts or other devices. In order to reduce the installation difficulty of the protective plate 620 and minimize the number of blind holes or through holes on the valve seat 200 to prevent adverse effects on the structural strength of the valve seat 200, in another embodiment of this application, the protective plate 620 and the receiving groove 230 can be interference-fitted.

[0113] Specifically, the outer edge of the shielding rib 622 in the protective plate 620, away from the bridging portion 621, can be pressed against the inner wall of the receiving groove 230 to ensure that the protective plate 620 can form a relatively stable assembly relationship with the valve seat 200. In another embodiment of this application, such as 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 rib 622, and the outer edge of each shielding rib 622 is fixedly connected to the inner edge of the circumferential connecting portion 623. In this case, the structural stability of the shielding rib 622 is relatively stronger, preventing the shielding rib 622 from bending or breaking during transportation, and further improving the structural stability of the protective plate 620.

[0114] 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 integrally formed. This can further improve 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 press against the groove sidewall 232 of the receiving groove 230, so that the entire protective plate 620 can form an interference fit with the receiving groove 230. This ensures a more reliable fixed assembly relationship between the protective plate 620 and the valve seat 200. Compared with directly pressing the shielding rib 622 against the receiving groove 230, the technical solution disclosed in this application can prevent the shielding rib 622 from bending, deforming, or even breaking during the pressing process with the receiving groove 230, thereby improving the service life and protective effect of the protective plate 620.

[0115] Furthermore, when the protective plate 620 includes a circumferential connecting portion 623, the diameter or other dimensions of the receiving groove 230 can be appropriately increased to prevent the circumferential connecting portion 623 from obstructing the first drainage channel 240. That is, in this embodiment, in the radial direction of the valve seat 200, the second port 241 of any first drainage channel 240 is spaced apart from the groove sidewall 232 of the receiving groove 230, wherein the radial direction of the valve seat 200 is perpendicular to its axial direction, and the spacing between the first drainage channel 240 and the groove sidewall 232 of the receiving groove 230 can be determined based on parameters such as the radial dimension of the circumferential connecting portion 623.

[0116] To further prevent the protective plate 620 from being deformed or even damaged by pressure during installation, in another embodiment of this application, the valve seat 200 can include a separately formed seat body 200a and a bushing 200b. The seat body 200a has a recess and a first seat end face 213, and the recess includes the aforementioned receiving groove 230. Specifically, in the hydraulic end disclosed in this embodiment, in addition to the receiving groove, the outer side of the receiving groove 230 is further hollowed out to utilize the recess to simultaneously accommodate both the bushing 200b and the protective plate 620. Of course, the seat body also has other structures such as a first drainage channel 240.

[0117] More specifically, the bushing 200b is located on the side of the protective plate 620 opposite to the first seat end face 213. The side of the bushing 200b opposite to the protective plate 620 has the aforementioned second mating concave surface 252, so that the valve seat 200 can still mate with the drain valve assembly 310b using the second mating concave surface 252 on the bushing 200b. At the same time, the bushing 200b is interference-fitted with the receiving groove 230 to position the protective plate 620 and the valve seat 200 in the axial direction of the valve seat. The bushing 200b has a ring-shaped structure, and the inner diameter of the bushing can be appropriately increased according to actual needs to ensure that the bushing does not interfere with or obstruct the draining process of the valve seat 200.

[0118] In this embodiment, the bushing 200b provides positioning for the protective plate 620, thereby allowing the radial dimension of the protective plate 620 to be slightly smaller than the radial dimension of the receiving groove 230. This ensures that the protective plate 620 will not be squeezed against the valve seat 200 during installation, thus guaranteeing high structural stability and service life for the protective plate 620. Correspondingly, the radial dimension of the bushing 200b can be designed to form an interference fit with the receiving groove 230 during installation, ensuring that the bushing provides good positioning for the protective plate 620.

[0119] It should be noted that the aforementioned receiving groove 230, protective plate 620, and bushing 200b are not necessarily circular structures. The radial dimensions mentioned above are merely for the purpose of describing the shape and assembly relationship of the above structures. In other embodiments of this application, the receiving groove 230, protective plate 620, and bushing 200b can also be rectangular or other irregular shapes. Of course, in order to facilitate processing and to maximize the protective coverage of the protective plate 620, the receiving groove 230, protective plate 620, and bushing 200b can all be circular or approximately circular structures.

[0120] In the hydraulic end, when the protective plate 620 has a bushing 200b on the side opposite to the first end face 213 of the valve seat 200, the structure that directly cooperates with the drain 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 bushing 200b may be too small, which will reduce the positioning effect of the bushing 200b. To address the aforementioned issues, in another embodiment of this application, the bushing 200b can directly mate with the drain valve assembly 310b. Furthermore, to increase the contact area between the bushing 200b and the valve body of the drain valve assembly 310b, a second mating concave surface 252 can be provided on the side of the bushing 200b facing away from the protective plate 620. The second mating concave surface 252 is recessed relative to the second seat end face 214, allowing it to mate with the valve body (and valve rubber) of the drain valve assembly 310b. During the liquid inlet process, the drain valve assembly 310b and the second mating concave surface 252 of the bushing 200b are sealed together.

[0121] Furthermore, if the discharge pressure at the hydraulic end is not excessive, the aforementioned protective plate 620 may not be required on the discharge side of the valve seat 200. In this case, such as Figure 15 and Figure 16 As shown, the first drainage channel 240 provided on the valve seat 200 can extend from the first seat end face 213 to the second mating concave surface 252, so that under the action of the second mating concave surface 252, the contact area between the valve seat 200 and the drainage valve assembly 310b can be increased, thereby improving the stability of the sealing relationship between the two.

[0122] Based on the hydraulic end disclosed in any of the above embodiments, this application also discloses a valve box 100, which is provided with a mounting cavity 110. In a first direction, the mounting cavity 110 extends through the valve box 100. The mounting cavity 110 of the valve box 100, or the extension direction of the mounting cavity 110 of the valve box 100, is used to mount the valve seat 200, the valve assembly and the plunger 400.

[0123] Based on the hydraulic end disclosed in any of the above embodiments, such as Figure 17 and Figure 18 As shown in the illustration, this application also discloses a pump, which includes any of the aforementioned hydraulic ends. Of course, the pump may also include a power end 900 and other mechanisms such as a reduction gear mechanism; for the sake of brevity, these will not be described in detail here.

[0124] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A fluid end characterized by, Includes 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 the first direction (X), the mounting cavity (110) extends through 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 fluid end of claim 1, wherein, The valve box (100) has a first box end face (131) and a second box end face (132). In the first direction (X), the first box end face (131) and the second box end face (132) are located at opposite ends of the valve box (100), and 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). 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). 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 face (131), and the second sealing ring surface (112) is adjacent to the second box end face (132).

3. The fluid end of claim 2, wherein, The connecting ring surface (113) is an annular closed surface.

4. The fluid end of claim 2, wherein, The mounting cavity (110) has multiple through holes (120) on its outer periphery. The connecting bolt (511) can be installed in the through holes (120), and the hydraulic end can be fixedly connected to other mechanisms through the connecting bolt (511).

5. The fluid end of claim 4, wherein, The valve box (100) is provided with a relief groove (140) in the portion between the first box end face (131) and the second box end face (132). The relief groove (140) is recessed from the surface of the valve box (100), and the through hole (120) extends from the second box end face (132) to the relief groove (140). Alternatively, in the first direction (X), the through hole (120) extends from the first box end face (131) to the second box end face (132) to penetrate the valve box (100).

6. The fluid end of claim 2, wherein, The valve box (100) has a third end face (133) and a fourth end face (134). The third end face (133) and the fourth end face (134) are both located between the first end face (131) and the second end face (132). In the second direction (Y), the fourth end face (134) and the third end face (133) are located at opposite ends of the valve box (100). The second direction (Y) is not parallel to the first direction (X). The valve box (100) is provided with multiple liquid inlet channels (171) and multiple mounting cavities (110). The multiple mounting cavities (110) are arranged at intervals along a third direction (Z). The third direction (Z) is not parallel to the first direction (X) and is not parallel to the second direction (Y). Each of the mounting cavities (110) is connected to 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 face (133) or the fourth box end face (134).

7. The fluid end of claim 1, wherein, The valve box (100) is provided with a drain channel (161), which is connected to the mounting cavity (110) and is located around the mounting cavity (110). The extension direction of the drain channel (161) is not parallel to the first direction, and the minimum distance (M) between the inner wall of the drain channel (161) away from the axis of the mounting cavity (110) and the mounting cavity (110) is greater than 0.

8. The fluid end of claim 7, wherein, The valve assembly (310) includes a drain valve assembly (310b), which is disposed on the side of the valve seat (200) away from the plunger (400), and the drain valve assembly (310b) is provided with a drain cap (342) on the side of the valve seat (200) away from the valve seat (200). During the operation of the hydraulic end, the maximum area of ​​the drain channel (161) invaded by the drain valve assembly (310b) and the drain cap (342) is less than or equal to 80% of the drain area of ​​the drain channel.

9. A valve chest (100) for use in a fluid end, characterized by, The valve box (100) is provided with a mounting cavity (110). In the first direction (X), the mounting cavity (110) extends through 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).

10. A pump characterized by, Includes the hydraulic end as described in any one of claims 1-8.

Images