Reciprocating pump fluid end

Abstract

The utility model provides a reciprocating pump fluid end which comprises a main valve body, a liquid suction valve assembly, a liquid discharge valve assembly and a plunger, the main valve body is of an L-shaped structure, and a T-shaped channel is formed in the main valve body; the liquid suction valve assembly, the liquid discharge valve assembly and the plunger are respectively arranged in one port of the T-shaped channel, and the liquid suction valve assembly is opposite to the plunger; the displacement stroke of the plunger is smaller than the distance between the axis of the drain valve assembly and the side wall of the main valve body. The main valve body is arranged to be of the L-shaped structure, the T-shaped channel is formed, in this way, the plunger, the liquid suction valve assembly and the liquid drainage valve assembly can be assembled conveniently, and the end of the plunger can correspond to the axis of the liquid drainage valve assembly through the structure so that the plunger can be relatively close to the liquid suction valve assembly; by limiting the stroke of the plunger, the end of the plunger can be prevented from being separated from the main valve body of the fluid end when the plunger acts; therefore, the displacement of the plunger and the displacement of the action part of the liquid suction valve assembly can share the same chamber, so that the hydraulic end has the advantage of simple and compact structure.

Description

Technical Field

[0001] The utility model relates to the technical field of pump machines, in particular to a hydraulic end of a reciprocating pump. Background Art

[0002] A reciprocating pump is a pump that transports fluids through the reciprocating motion of a piston, plunger, or diaphragm within a pump chamber. The reciprocating pump drives the piston, plunger, or diaphragm to reciprocate within the pump chamber through a mechanical device, causing a periodic change in the volume of the pump chamber, thereby realizing the process of sucking and discharging liquids; its driving part is the power end, and the valve group working part is the hydraulic end, which is mostly used for transporting high-pressure oil and gas, water, and chemical additives.

[0003] The existing utility model patent with the authorized announcement number of CN213953824U discloses a high-pressure reciprocating plunger pump with low energy consumption. It consists of a power end and a hydraulic end; among them, the power end includes a crankcase, a crankshaft, a connecting rod, and a crosshead; the hydraulic end includes a cylinder block, a plunger, an intermediate rod, a pump head, a suction valve group, and a discharge valve group.

[0004] In the above technical solution, the hydraulic end of the plunger pump is a very common liquid inlet and outlet control structure (usually, such a valve group is composed of a valve seat, a spring / tension spring, and a valve core, and the valve core is connected to the valve seat through the spring / tension spring; when the plunger works, a negative pressure is generated, causing the fluid to push open the input valve core when entering, and when the plunger pushes the fluid to output, the input valve core is reset in cooperation with the spring / tension spring, and the output valve core is opened). When the suction valve group is working, the valve core will reciprocate between the valve seat and the discharge valve group, and this position corresponds to the end of the plunger. As a result, if the plunger is to obtain a sufficient stroke, it can only be achieved by extending the length of the power end, resulting in an insufficiently compact structure and an overly large equipment volume. Content of the Utility Model

[0005] In view of this, the utility model provides a hydraulic end of a reciprocating pump with a simple and compact structure, which can effectively reduce the volume of the reciprocating pump, so as to solve the problem of insufficiently compact structure and overly large volume caused by the structure of the existing hydraulic end of the reciprocating pump.

[0006] The technical solution of the utility model is realized as follows: The utility model provides a hydraulic end of a reciprocating pump, including a main valve body, a suction valve assembly, a discharge valve assembly, and a plunger. Among them,

[0007] The main valve body has an L-shaped structure, and a T-shaped channel is opened inside the main valve body;

[0008] The suction valve assembly, the discharge valve assembly, and the plunger are respectively arranged in a port of the T-shaped channel, and the suction valve assembly is opposite to the plunger;

[0009] The displacement stroke of the plunger is less than the distance between the axis of the discharge valve assembly and the side wall of the main valve body.

[0010] Based on the above technical solutions, preferably, one end of the main valve body is used to install the liquid suction valve assembly, and the other end is used to install the liquid discharge valve assembly.

[0011] Based on the above technical solutions, preferably, the liquid suction valve assembly includes an electromagnetic valve body and a first valve core, wherein,

[0012] The electromagnetic valve body is fitted and arranged in the main valve body. A first liquid inlet is provided on the side surface of the electromagnetic valve body, and a first liquid outlet is provided on the end surface.

[0013] The main valve body is provided with an input port corresponding to the first liquid inlet.

[0014] The first valve core is arranged on the first piston rod of the electromagnetic valve body and is used to seal the first liquid outlet.

[0015] Based on the above technical solutions, preferably, the liquid discharge valve assembly includes a liquid discharge valve body, a second piston rod, a second valve core and a second spring, wherein,

[0016] The liquid discharge valve body is fitted and arranged in the main valve body. A second liquid outlet is provided on the side surface of the liquid discharge valve body, and a second liquid inlet is provided on the end surface.

[0017] The main valve body is provided with an output port corresponding to the second liquid outlet.

[0018] The second piston rod is arranged in the liquid discharge valve body and is in sliding fit with each other.

[0019] The second valve core is arranged at the end of the second piston rod to seal the second liquid inlet.

[0020] The second spring is sleeved on the second piston rod and abuts against the liquid discharge valve body and the second valve core.

[0021] Based on the above technical solutions, preferably, the liquid suction valve assembly further includes a first valve seat, and the liquid discharge valve assembly further includes a second valve seat, wherein,

[0022] The first valve seat is arranged at one end of the electromagnetic valve body located in the main valve body, and the first liquid outlet is provided on the first valve seat.

[0023] The second valve seat is arranged at one end of the liquid discharge valve body located in the main valve body, and the second liquid inlet is provided on the second valve seat.

[0024] Part of the end of the second valve seat corresponds to the circumferential surface of the first valve seat.

[0025] Based on the above technical solutions, preferably, the output port is provided on one side of the main valve body close to the liquid suction valve assembly.

[0026] Based on the above technical solutions, preferably, the liquid suction valve assembly further includes an electromagnet, a first spring, an armature and a protective shell, wherein,

[0027] The electromagnet is arranged at one end of the solenoid valve body away from the first valve core;

[0028] The first spring is sleeved on the first piston rod;

[0029] The armature is arranged at one end of the first piston rod away from the first valve core and abuts against the first spring;

[0030] The protective shell is relatively fixed to the main valve body, and the first piston rod penetrates through the protective shell.

[0031] On the basis of the above technical solutions, preferably, the liquid suction valve assembly further includes an electromagnet, a first spring, an armature, a protective shell and a limit plate, wherein,

[0032] The electromagnet is arranged at one end of the solenoid valve body away from the first valve core;

[0033] The protective shell is relatively fixed to the main valve body, and the first piston rod penetrates through the protective shell;

[0034] The first spring is sleeved on the first piston rod, and the first spring is located outside the protective shell;

[0035] The armature is arranged on the first piston rod, and the armature is located inside the protective shell;

[0036] The limit plate is arranged on the first piston rod, and the limit plate and the protective shell clamp the first spring.

[0037] On the basis of the above technical solutions, preferably, a rubber pad is pasted on the side of the armature facing the electromagnet.

[0038] On the basis of the above technical solutions, preferably, it further includes a first pressing plate and a second pressing plate, wherein,

[0039] The first pressing plate is connected to the main valve body, abuts against the liquid suction valve assembly, and the first pressing plate is provided with an inner hole 501;

[0040] The second pressing plate is connected to the main valve body and abuts against the liquid discharge valve assembly).

[0041] The liquid end of the reciprocating pump of the present utility model has the following beneficial effects compared with the prior art:

[0042] (1) By setting the main valve body as an L-shaped structure and providing a T-shaped channel, it is convenient to assemble the plunger, the liquid suction valve assembly and the liquid discharge valve assembly. This structure enables the end of the plunger to correspond to the axis of the liquid discharge valve assembly, so as to be relatively close to the liquid suction valve assembly; by limiting the stroke of the plunger, it is possible to prevent the end from detaching from the main valve body of the liquid end when the plunger moves; in this way, the displacement of the plunger and the displacement of the moving parts of the liquid suction valve assembly can share the same chamber, so that the liquid end has the advantages of simple and compact structure, and the volume of the reciprocating pump can be reduced;

[0043] (2) The liquid suction valve assembly adopts a solenoid valve, and the first piston rod of the moving part penetrates through the protective shell. In this way, when the liquid suction valve assembly operates, the movement of the first piston rod can be directly observed, which is convenient for the operator to understand the working condition of this reciprocating pump.

[0044] (3) By setting a limit plate on the first piston rod and arranging the spring outside the protective shell, it is convenient to replace and maintain the spring when it fails or is fatigued, thereby improving the convenience of maintenance and avoiding leakage problems. Description of the Drawings

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0046] Figure 1 It is a structural diagram of the hydraulic end of the reciprocating pump of the present invention;

[0047] Figure 2 It is a structural diagram of the liquid discharge valve assembly of the hydraulic end of the reciprocating pump of the present invention;

[0048] Figure 3 It is a structural diagram of the liquid suction valve assembly of the hydraulic end of the reciprocating pump of the present invention;

[0049] Figure 4 It is a structural diagram of the external spring of the liquid suction valve assembly of the hydraulic end of the reciprocating pump of the present invention;

[0050] In the figure: 1. Valve body; 101. Side wall; 102. Input port; 103. Output port; 2. Liquid suction valve assembly; 201. First liquid inlet; 202. First liquid outlet; 21. Solenoid valve body; 211. First piston rod; 22. First valve core; 23. First valve seat; 24. Electromagnet; 25. First spring; 26. Armature; 27. Protective shell; 28. Limit plate; 3. Liquid discharge valve assembly; 31. Liquid discharge valve body; 32. Second piston rod; 33. Second valve core; 34. Second spring; 35. Second valve seat; 301. Second liquid outlet; 302. Second liquid inlet; 4. Plunger; 5. First pressing plate; 501. Inner hole; 6. Second pressing plate. Detailed Embodiments

[0051] Next, in combination with the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0052] As Figures 1 to 4 shown, the hydraulic end of the reciprocating pump of the present utility model includes a main valve body 1, a suction valve assembly 2, a discharge valve assembly 3, a plunger 4, a first pressing plate 5 and a second pressing plate 6.

[0053] As Figure 1 shown, the main valve body 1 has an L-shaped structure, and a T-shaped channel is provided inside the main valve body 1; the suction valve assembly 2, the discharge valve assembly 3 and the plunger 4 are respectively arranged in a port of the T-shaped channel, and the suction valve assembly 2 is opposite to the plunger 4; the displacement stroke of the plunger 4 is less than the distance between the axis of the discharge valve assembly 3 and the side wall 101 of the main valve body 1.

[0054] In the above structure, by setting the main valve body 1 to an L-shaped structure and providing a T-shaped channel, it is convenient to assemble the plunger 4, the suction valve assembly 2 and the discharge valve assembly 3. This structure enables the end of the plunger 4 to correspond to the axis of the discharge valve assembly 3 to be relatively close to the suction valve assembly 2; by limiting the stroke of the plunger 4, it can be avoided that the end of the plunger 4 disengages from the main valve body 1 of the hydraulic end when the plunger 4 moves; thus, the displacement of the plunger 4 and the displacement of the moving parts of the suction valve assembly 2 can share the same chamber, so that the hydraulic end has the advantages of simple and compact structure, and can reduce the volume of the reciprocating pump.

[0055] Specifically, during operation, when the plunger 4 moves away from the suction valve assembly 2, the suction valve assembly 2 opens, and the liquid enters the main valve body 1 through the suction valve assembly 2; when the plunger 4 moves towards the suction valve assembly 2, the suction valve assembly 2 closes, and the discharge valve assembly 3 opens, so that the liquid is discharged through the discharge valve assembly 3.

[0056] As Figure 1 shown, one end of the main valve body 1 is used to install the suction valve assembly 2, and the other end is used to install the discharge valve assembly 3.

[0057] In the above structure, when assembling the hydraulic end, the L-shaped main valve body 1 has two ends, which are respectively used to install the suction valve assembly 2 and the discharge valve assembly 3, and the plunger 4 is arranged in the middle part. In this way, when the plunger 4 moves, it is convenient to be linked with the suction valve assembly 2 and the discharge valve assembly 3, which not only ensures the compactness of the structure, but also enables the two valve assemblies to have sufficient space for installation, and the layout is reasonable.

[0058] As Figure 3As shown in the figure, the liquid suction valve assembly 2 includes a solenoid valve body 21 and a first valve core 22. Among them, the solenoid valve body 21 is fitted and arranged in the main valve body 1. A first liquid inlet 201 is provided on the side surface of the solenoid valve body 21, and a first liquid outlet 202 is provided on the end surface. The main valve body 1 is provided with an input port 102 corresponding to the first liquid inlet 201. The first valve core 22 is arranged on the first piston rod 211 of the solenoid valve body 21 for sealing the first liquid outlet 202.

[0059] In the above structure, when the plunger 4 is away from the liquid suction valve assembly 2, due to the negative pressure, the first piston rod 211 will move, thereby driving the displacement of the first valve core 22, so that the first liquid outlet 202 is opened. At this time, the liquid can enter the liquid suction valve assembly 2 through the input port 102 of the main valve body 1 and the first liquid inlet 201 of the solenoid valve body 21, and then enter the main valve body 1 through the first liquid outlet 202 to realize the liquid suction action.

[0060] As Figure 2 shown in the figure, the liquid discharge valve assembly 3 includes a liquid discharge valve body 31, a second piston rod 32, a second valve core 33 and a second spring 34. Among them, the liquid discharge valve body 31 is fitted and arranged in the main valve body 1. A second liquid outlet 301 is provided on the side surface of the liquid discharge valve body 31, and a second liquid inlet 302 is provided on the end surface. The main valve body 1 is provided with an output port 103 corresponding to the second liquid outlet 301. The second piston rod 32 is arranged in the liquid discharge valve body 31 and is in sliding fit with each other. The second valve core 33 is arranged at the end of the second piston rod 32 for sealing the second liquid inlet 302. The second spring 34 is sleeved on the second piston rod 32 and abuts against the liquid discharge valve body 31 and the second valve core 33.

[0061] In the above structure, when the plunger 4 approaches the liquid suction valve assembly 2, the first piston rod 211 moves, so that the first valve core 22 blocks the first liquid outlet 202, thereby closing the liquid suction valve assembly 2.

[0062] At the same time, under the extrusion of the liquid, the second valve core 33 and the second piston rod 32 are driven to displace, so that the second liquid inlet 302 is opened. At this time, the liquid in the main valve body 1 will enter the liquid discharge valve assembly 3 and be discharged through the second liquid outlet 301 and the output port 103.

[0063] The plunger 4 repeats the reciprocating linear displacement, thus realizing the transportation of the liquid.

[0064] As Figures 1 to 4As shown, the liquid suction valve assembly 2 further includes a first valve seat 23, and the liquid discharge valve assembly 3 further includes a second valve seat 35. Among them, the first valve seat 23 is arranged at one end of the solenoid valve body 21 located inside the main valve body 1, and the first liquid outlet 202 is opened on the first valve seat 23; the second valve seat 35 is arranged at one end of the liquid discharge valve body 31 located inside the main valve body 1, and the second liquid inlet 302 is opened on the second valve seat 35; one end of the second valve seat 35 partially corresponds to the circumferential surface of the first valve seat 23.

[0065] In the above structure, when arranging the liquid suction valve assembly 2 and the liquid discharge valve assembly 3, the liquid inlet and outlet are opened by relying on the first valve seat 23 and the second valve seat 35.

[0066] Among them, the first valve seat 23 is used to open the first liquid outlet 202 of the liquid suction valve assembly 2, and the second valve seat 35 is used to open the second liquid inlet 302 of the liquid discharge valve assembly 3 and cooperate with the valve core for use; in order to ensure the compactness of the structure, a part of one end of the second valve seat 35 is corresponding to the circumferential surface of the first valve seat 23, so that the length in the direction from the plunger 4 to the liquid suction valve assembly 2 can be reduced, thus ensuring the compactness of the hydraulic end.

[0067] Specifically, the output port 103 is opened on one side of the main valve body 1 close to the liquid suction valve assembly 2.

[0068] In the above structure, by arranging the output port 103 on this side, a flat plane will be formed on the side of the main valve body 1 where the plunger 4 is arranged, and no other components need to be installed, so it is convenient to be assembled onto the power end of the reciprocating pump, ensuring the convenience of assembly.

[0069] As Figure 3 shown, the liquid suction valve assembly 2 further includes an electromagnet 24, a first spring 25, an armature 26 and a protective shell 27. Among them, the electromagnet 24 is arranged at one end of the solenoid valve body 21 away from the first valve core 22; the first spring 25 is sleeved on the first piston rod 211; the armature 26 is arranged at one end of the first piston rod 211 away from the first valve core 22 and abuts against the first spring 25; the protective shell 27 is relatively fixed to the main valve body 1, and the first piston rod 211 penetrates through the protective shell 27.

[0070] In the above structure, the assembly adopts a solenoid valve, and the moving part, the first piston rod 211, penetrates through the protective shell 27. Thus, when the liquid suction valve assembly 2 operates, the electromagnet 24 drives the first piston rod 211 and the first valve core 22 to move through the cooperation with the armature 26. When the electromagnet 24 is attracted, the liquid suction valve assembly 2 is opened, and after power-off, it is closed under the action of the first spring 25. Since the first piston rod 211 reciprocates and penetrates through the protective shell 27, the movement of the first piston rod 211 can be directly observed, which is convenient for the operator to understand the working condition of this reciprocating pump.

[0071] As Figure 4As shown, the liquid suction valve assembly 2 further includes an electromagnet 24, a first spring 25, an armature 26, a protective shell 27 and a limiting plate 28. Among them, the electromagnet 24 is arranged at one end of the solenoid valve body 21 away from the first valve core 22; the protective shell 27 is fixedly connected to the main valve body 1, and the first piston rod 211 passes through the protective shell 27; the first spring 25 is sleeved on the first piston rod 211, and the first spring 25 is located outside the protective shell 27; the armature 26 is arranged on the first piston rod 211, and the armature 26 is located inside the protective shell 27; the limiting plate 28 is arranged on the first piston rod 211, and the limiting plate 28 and the protective shell 27 clamp the first spring 25.

[0072] In the above structure, in this embodiment, a limiting plate 28 is provided, and the first spring 25 and the limiting plate 28 are externally arranged; by arranging the limiting plate 28 on the first piston rod 211 and arranging the first spring 25 outside the protective shell 27, when the first spring 25 fails or is fatigued, resulting in the abnormal operation of the liquid suction valve assembly 2, it is convenient to replace and maintain, thereby improving the convenience of maintenance and avoiding leakage problems; at the same time, it is also convenient for observation.

[0073] The limiting plate 28 is used to cooperate with the first spring 25 so that the first piston rod 211 can drive the first valve core 22 to displace, thereby closing the first liquid outlet 202.

[0074] Furthermore, a rubber pad is pasted on the side of the armature 26 facing the electromagnet 24.

[0075] In the above structure, since the first spring 25 is externally arranged, in order to prevent the armature 26 from hitting the electromagnet 24 and causing damage, a rubber pad is provided for buffering.

[0076] As Figure 1 shown, the first pressing plate 5 is connected to the main valve body 1 and abuts against the liquid suction valve assembly 2, and the first pressing plate 5 is provided with an inner hole 501; the second pressing plate 6 is connected to the main valve body 1 and abuts against the liquid discharge valve assembly 3.

[0077] In the above structure, the first pressing plate 5 and the second pressing plate 6 are used to fix the liquid suction valve assembly 2 and the liquid discharge valve assembly 3. At this time, after the liquid suction valve assembly 2 and the liquid discharge valve assembly 3 are inserted into the main valve body 1, they can be tightly fixed by the pressing plate to ensure the convenience of component disassembly and assembly.

[0078] The inner hole 501 is used for the first piston rod 211 to pass through.

[0079] Specific implementation steps:

[0080] First, the plunger 4 moves away from the liquid suction valve assembly 2. The electromagnet 24 attracts the armature 26, causing the first piston rod 211 and the first valve core 22 to displace. The first spring 25 is compressed, and the first liquid outlet 202 opens. The liquid enters the liquid suction valve assembly 2 through the input port 102 and the first liquid inlet 201, and then enters the main valve body 1 through the first liquid outlet 202;

[0081] Subsequently, the electromagnet 24 is powered off. Under the action of the first spring 25, the first valve core 22 closes the first liquid outlet 202, and the plunger 4 synchronously displaces towards the liquid suction valve assembly 2. Under pressure, the second piston rod 32 and the second valve core 33 displace, and the second spring 34 is compressed. The liquid enters the liquid discharge valve assembly 3 through the second liquid inlet 302, and then is discharged through the second liquid outlet 301 and the output port 103;

[0082] The plunger 4 moves towards the liquid suction valve assembly 2 again, and the second spring 34 drives the second valve core 33 to reset;

[0083] Repeat the above actions to achieve continuous liquid delivery.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A reciprocating pump hydraulic end, characterized in that: The invention comprises a main valve body (1), a liquid suction valve assembly (2), a liquid discharge valve assembly (3) and a plunger (4), wherein: The main valve body (1) is in an L-shaped structure, and a T-shaped channel is provided inside the main valve body (1); The liquid suction valve assembly (2), the liquid discharge valve assembly (3) and the plunger (4) are each arranged in one port of the T-shaped channel, and the liquid suction valve assembly (2) is opposite to the plunger (4); The displacement stroke of the plunger (4) is smaller than the distance between the axis of the liquid discharge valve assembly (3) and the side wall (101) of the main valve body (1).

2. The reciprocating pump hydraulic end according to claim 1, characterized in that: One end of the main valve body (1) is used for installing the liquid suction valve assembly (2), and the other end is used for installing the liquid discharge valve assembly (3).

3. The reciprocating pump hydraulic end according to claim 1, characterized in that: The liquid suction valve assembly (2) comprises a solenoid valve body (21) and a first valve core (22), wherein: The electromagnetic valve body (21) is embedded in the main valve body (1), a first liquid inlet (201) is provided on the side surface of the electromagnetic valve body (21), and a first liquid outlet (202) is provided on the end surface; The main valve body (1) is provided with an input port (102) corresponding to the first liquid inlet (201); The first valve core (22) is arranged on the first piston rod (211) of the electromagnetic valve body (21) and is used to seal the first liquid outlet (202).

4. The reciprocating pump hydraulic end according to claim 3, characterized in that: The liquid discharge valve assembly (3) comprises a liquid discharge valve body (31), a second piston rod (32), a second valve core (33) and a second spring (34), wherein: The liquid discharge valve body (31) is embedded in the main valve body (1), a second liquid outlet (301) is provided on the side surface of the liquid discharge valve body (31), and a second liquid inlet (302) is provided on the end surface; The main valve body (1) is provided with an output port (103) corresponding to the second liquid outlet (301); the second piston rod (32) is arranged in the liquid discharge valve body (31) and is slidably matched with each other; The second valve core (33) is arranged at the end of the second piston rod (32) to seal the second liquid inlet (302); The second spring (34) is sleeved on the second piston rod (32) and abuts against the liquid discharge valve body (31) and the second valve core (33).

5. The reciprocating pump hydraulic end according to claim 4, characterized in that: The liquid suction valve assembly (2) further comprises a first valve seat (23), and the liquid discharge valve assembly (3) further comprises a second valve seat (35), wherein: The first valve seat (23) is arranged on one end of the solenoid valve body (21) located inside the main valve body (1), and the first liquid outlet (202) is opened on the first valve seat (23); The second valve seat (35) is arranged on one end of the liquid discharge valve body (31) located inside the main valve body (1), and the second liquid inlet (302) is opened on the second valve seat (35); An end portion of the second valve seat (35) partially corresponds to the circumferential surface of the first valve seat (23).

6. The reciprocating pump hydraulic end according to claim 4 or 5, characterized in that: The output port (103) is disposed on a side of the main valve body (1) close to the liquid suction valve assembly (2).

7. The reciprocating pump hydraulic end according to any one of claims 3 to 5, characterized in that: The liquid suction valve assembly (2) further comprises an electromagnet (24), a first spring (25), an armature (26) and a protective shell (27), wherein: The electromagnet (24) is arranged on an end of the solenoid valve body (21) away from the first valve core (22); The first spring (25) is sleeved on the first piston rod (211); The armature (26) is arranged on an end of the first piston rod (211) away from the first valve core (22) and abuts against the first spring (25); The protective shell (27) is relatively fixed to the main valve body (1), and the first piston rod (211) passes through the protective shell (27).

8. The reciprocating pump hydraulic end according to claim 7, characterized in that: The liquid suction valve assembly (2) further comprises an electromagnet (24), a first spring (25), an armature (26), a protective shell (27) and a limit plate (28), wherein: The electromagnet (24) is arranged on an end of the solenoid valve body (21) away from the first valve core (22); The protective shell (27) is relatively fixed to the main valve body (1), and the first piston rod (211) passes through the protective shell (27); The first spring (25) is sleeved on the first piston rod (211), and the first spring (25) is located outside the protective shell (27); The armature (26) is arranged on the first piston rod (211), and the armature (26) is located on the inner side of the protective shell (27); The limit plate (28) is arranged on the first piston rod (211), and the limit plate (28) and the protective shell (27) clamp the first spring (25).

9. The reciprocating pump hydraulic end according to claim 8, characterized in that: A rubber pad is adhered to the side of the armature (26) facing the electromagnet (24).

10. The reciprocating pump hydraulic end according to any one of claims 1 to 5, characterized in that: It also includes a first pressing plate (5) and a second pressing plate (6), wherein: The first pressing plate (5) is connected to the main valve body (1) and abuts against the liquid suction valve assembly (2), and the first pressing plate (5) is provided with an inner hole (501); The second pressure plate (6) is connected to the main valve body (1) and abuts against the liquid discharge valve assembly (3).

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