Sand-resistant valve group and plunger pump

Abstract

The utility model relates to the technical field of plunger pumps, in particular to a sand-resistant valve group and a plunger pump, and aims to solve the problem that in the prior art, sewage containing silt enters the plunger pump, so that the valve group is stuck. The utility model provides a sand-resistant valve group. The sand-resistant valve group comprises a valve body, a first valve core part, a first elastic part, a second valve core part and a second elastic part, when the sand-resistant valve set is in a liquid inlet state, the conical surface of the first valve element part does not make contact with the valve body, the first valve element part is in an open state, and liquid flows into the liquid inlet cavity from the liquid inlet hole and flows out through a gap of the conical surface of the first valve element part. And when the sand-resistant valve group is in a liquid outlet state, the conical surface of the second valve element part is not in contact with the valve body, the second valve element part is in an open state, and liquid flowing through the conical surface gap of the first valve element part flows into the liquid outlet cavity through the liquid outlet hole, passes through the conical surface gap of the second valve element part and is discharged from the liquid outlet of the pump head. According to the sand-resistant valve bank, the service life of the valve bank is prolonged, the replacement frequency of the valve bank is reduced, and the working efficiency of a plunger pump is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of plunger pumps, in particular to an anti-sand valve group and a plunger pump. Background Art

[0002] The valve group is the most commonly used important device in the field of plunger pump technology. Its main function is to ensure the normal operation of the plunger pump.

[0003] The valve group is installed in the pump head of the plunger pump, and the reciprocating motion of the plunger is used to absorb and discharge water to meet the working conditions of on-site water injection. If the valve group has problems during use, repeated replacement or repair will affect the efficiency of the water injection pump. Therefore, a valve group that meets the working conditions of on-site use plays a decisive role in improving the efficiency of the water injection pump.

[0004] At present, many oil fields inject the extracted groundwater back into the ground through plunger pumps to prevent environmental pollution. The extracted groundwater is sewage and may contain a lot of sediment. Ordinary valve groups can only be used in clean water environments. A large amount of sewage containing sediment entering the plunger pump will cause the valve group to get stuck. Long-term use will burn the crankshaft at the power end, causing great harm to the water injection pump. Utility Model Content

[0005] The utility model aims to provide an anti-sand valve group and a plunger pump, so as to solve the problem in the prior art that sewage containing silt enters the plunger pump and causes the valve group to get stuck.

[0006] In order to solve the above technical problems, the technical solution provided by the utility model is:

[0007] In a first aspect, the utility model provides an anti-sand valve assembly, comprising: a valve body, a first valve core portion, a first elastic portion, a second valve core portion, and a second elastic portion;

[0008] The valve body, the first valve core portion, the first elastic portion, the second valve core portion and the second elastic portion are all arranged in the pump head;

[0009] One end of the valve body is connected to the first elastic part, and the other end is connected to the second elastic part;

[0010] The end of the first valve core part is inserted into the liquid inlet cavity of the valve body, the contact surface between the middle part of the first valve core part and the valve body is set as a cone surface, the other end of the first valve core part is inserted into the first elastic part, and the first valve core part can move relative to the valve body and the first elastic part;

[0011] The end of the second valve core is inserted into the liquid outlet cavity of the valve body away from one end of the first elastic part, the contact surface between the middle of the second valve core and the valve body is set as a cone, the other end of the second valve core is inserted into the second elastic part, and the second valve core can move relative to the valve body and the second elastic part;

[0012] The valve body is provided with a liquid inlet hole and a liquid outlet hole, the liquid inlet hole is communicated with the liquid inlet cavity, and the liquid outlet hole is communicated with the liquid outlet cavity;

[0013] When the anti-sand valve assembly is in a liquid-intake state, the conical surface of the first valve core portion does not contact the valve body, the first valve core portion is in an open state, and liquid flows into the liquid-intake cavity from the liquid inlet hole and flows out through the conical surface gap of the first valve core portion;

[0014] When the anti-sand valve group is in a liquid discharge state, the conical surface of the second valve core portion does not contact the valve body, and the second valve core portion is in an open state. Liquid flowing through the conical surface gap of the first valve core portion flows into the liquid outlet cavity through the liquid outlet hole, passes through the conical surface gap of the second valve core portion, and is discharged from the liquid discharge port of the pump head.

[0015] Furthermore,

[0016] The first valve core portion includes a first valve core body and a first sealing ring;

[0017] One end of the first valve core body is inserted into the valve body, and the other end is inserted into the first elastic part;

[0018] The first sealing ring is sleeved on the first valve core body, and a side of the first sealing ring close to the valve body is arranged as a first conical surface.

[0019] Furthermore,

[0020] A surface of the valve body in contact with the first sealing ring is configured as a conical surface, and the conical surface of the valve body is adapted to the curvature of the first conical surface of the first sealing ring.

[0021] Furthermore,

[0022] The second valve core portion includes a second valve core body and a second sealing ring;

[0023] One end of the second valve core body is inserted into the valve body, and the other end is inserted into the second elastic part;

[0024] The second sealing ring is sleeved on the second valve core body, and a side of the second sealing ring close to the valve body is arranged as a second conical surface.

[0025] Furthermore,

[0026] A surface of the valve body in contact with the second sealing ring is configured as a conical surface, and the conical surface of the valve body is adapted to the curvature of the second conical surface of the second sealing ring.

[0027] Furthermore,

[0028] The first elastic part includes a suction valve spring seat and a first spring body;

[0029] The suction valve spring seat is connected to the valve body, and one end of the first valve core body away from the valve body is inserted into the seat body of the suction valve spring seat;

[0030] One end of the first spring body is sleeved on the outside of the seat body of the suction valve spring seat, and the other end is connected to the first valve core body.

[0031] Furthermore,

[0032] A first step is provided on one side of the first valve core body close to the seat body of the suction valve spring seat, and the first spring body is sleeved on the first step.

[0033] Furthermore,

[0034] The second elastic portion includes a discharge valve spring seat and a second spring body;

[0035] The discharge valve spring seat is connected to the valve body, and one end of the second valve core body away from the valve body is inserted into the seat body of the discharge valve spring seat;

[0036] One end of the second spring body is sleeved on the outside of the seat body of the discharge valve spring seat, and the other end is connected to the second valve core body.

[0037] Furthermore,

[0038] A second step is provided on one side of the second valve core body close to the seat body of the discharge valve spring seat, and the second spring body is sleeved on the second step.

[0039] In a second aspect, the utility model provides a plunger pump, comprising the anti-sand valve group.

[0040] Based on the above technical solutions, the technical effects that can be achieved by the utility model are:

[0041] The anti-sand valve group provided by the utility model has the liquid flowing in from the liquid inlet hole of the valve body, passing through the liquid inlet cavity of the valve body, flowing into the liquid outlet cavity of the valve body through the liquid outlet hole, and finally discharged from the discharge port of the pump head. By setting the contact surface between the first valve core part and the second valve core part and the valve body in the form of a cone surface, the characteristic of the cone surface that facilitates the flow of particles is utilized, the accumulation of particles between the valve core part and the valve body is reduced, and the wear is reduced, thereby solving the problem of the valve group being stuck due to sewage containing silt entering the plunger pump in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 A schematic diagram of the structure of the anti-sand valve group provided in an embodiment of the utility model;

[0044] Figure 2 This is a schematic diagram of the anti-sand valve assembly installed in the pump head.

[0045] Icon: 100-valve body; 110-liquid inlet hole; 120-liquid outlet hole; 130-liquid inlet chamber; 140-liquid outlet chamber; 200-first valve core part; 210-first valve core body; 211-first step; 220-first sealing ring; 221-first cone surface; 300-first elastic part; 310-intake valve spring seat; 320-first spring body; 400-second valve core part; 410-second valve core body; 411-second step; 420-second sealing ring; 421-second cone surface; 500-second elastic part; 510-discharge valve spring seat; 520-second spring body; 600-pump head; 610-discharge port; 620-liquid inlet; 700-intake valve fixing seat; 800-compression flange. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0049] The utility model provides an anti-sand valve group, comprising: a valve body 100, a first valve core part 200, a first elastic part 300, a second valve core part 400 and a second elastic part 500; the valve body 100, the first valve core part 200, the first elastic part 300, the second valve core part 400 and the second elastic part 500 are all arranged in a pump head 600; one end of the valve body 100 is connected to the first elastic part 300, and the other end is connected to the second elastic part 500; the end of the first valve core part 20 ... The first valve core part 200 is inserted into the liquid inlet cavity 130 of the valve body 100, the contact surface between the middle part of the first valve core part 200 and the valve body 100 is set as a conical surface, the other end of the first valve core part 200 is inserted into the first elastic part 300, and the first valve core part 200 can move relative to the valve body 100 and the first elastic part 300; the end of the second valve core part 400 is inserted into the liquid outlet cavity 140 of the valve body 100 away from the end of the first elastic part 300, and the middle part of the second valve core part 400 is connected to the valve body 100. The contact surface is set as a conical surface, and the other end of the second valve core part 400 is inserted into the second elastic part 500, and the second valve core part 400 can move relative to the valve body 100 and the second elastic part 500; the valve body 100 is provided with a liquid inlet hole 110 and a liquid outlet hole 120, the liquid inlet hole 110 is connected with the liquid inlet cavity 130, and the liquid outlet hole 120 is connected with the liquid outlet cavity 140; when the anti-sand valve group is in the liquid inlet state, the conical surface of the first valve core part 200 does not contact the valve body 100, and the first valve core part 20 0 is the open state, the liquid flows into the liquid inlet cavity 130 from the liquid inlet hole 110, and flows out through the conical surface gap of the first valve core part 200; when the anti-sand valve group is in the liquid discharge state, the conical surface of the second valve core part 400 is not in contact with the valve body 100, and the second valve core part 400 is in the open state, and the liquid flowing through the conical surface gap of the first valve core part 200 flows into the liquid outlet cavity 140 through the liquid outlet hole 120, passes through the conical surface gap of the second valve core part 400, and is discharged from the discharge port 610 of the pump head 600.

[0050] The anti-sand valve group provided by the utility model, the liquid flowing in from the liquid inlet hole 110 of the valve body 100 passes through the liquid inlet cavity 130 of the valve body 100, flows into the liquid outlet cavity 140 of the valve body 100 through the liquid outlet hole 120, and finally is discharged from the discharge port of the pump head 600. By setting the contact surface between the first valve core part 200 and the second valve core part 400 and the valve body 100 in the form of a cone surface, the characteristic of the cone surface that facilitates the flow of particles is utilized, the accumulation of particles between the valve core part and the valve body 100 is reduced, and the wear is reduced, thereby solving the problem of the valve group being stuck due to the sewage containing silt entering the plunger pump in the prior art.

[0051] The following combination Figure 1-Figure 2 The structure and shape of the anti-sand valve group provided in this embodiment are described in detail.

[0052] Regarding the shape and structure of the valve body 100, in detail:

[0053] Reference Figure 1 and Figure 2 Placed in the pump head 600, one end of the valve body 100 is connected to the first elastic part 300, and the other end is connected to the second elastic part 500. The valve body 100 is provided with a liquid inlet hole 110 and a liquid outlet hole 120. The liquid inlet hole 110 is connected to the liquid inlet cavity 130. At the same time, the liquid inlet hole 110 is connected to the liquid inlet port 620 of the pump head 600, and the liquid outlet hole 120 is connected to the liquid outlet cavity 140.

[0054] Regarding the shape and structure of the first valve core portion 200, in detail:

[0055] Reference Figure 1 The first valve core portion 200 is arranged in the pump head 600, the end of the first valve core portion 200 is inserted into the liquid inlet cavity 130 of the valve body 100, the contact surface between the middle part of the first valve core portion 200 and the valve body 100 is set as a conical surface, and the other end of the first valve core portion 200 is inserted into the first elastic portion 300, and the first valve core portion 200 can move relative to the valve body 100 and the first elastic portion 300.

[0056] Specifically, the first valve core part 200 includes a first valve core body 210 and a first sealing ring 220. One end of the first valve core body 210 is inserted into the valve body 100 and can slide relative to the valve body 100, and the other end is inserted into the first elastic part 300. The first sealing ring 220 is sleeved on the first valve core body 210, and the side of the first sealing ring 220 close to the valve body 100 is set as a first conical surface 221. The side of the valve body 100 that contacts the first sealing ring 220 is set as a conical surface, and the conical surface of the valve body 100 is adapted to the curvature of the first conical surface 221 of the first sealing ring 220. The first valve core body 210 contacts the valve body 100 through the first sealing ring 220 to avoid iron-to-iron contact between the first valve core body and the valve body 100 during operation.

[0057] Among them, the first valve core body 210 is designed with positioning structures at the front and back. The front end is a pin shaft structure connected to the positioning hole of the seat body in the suction valve spring seat 310, and the rear end is designed with a cross groove structure, which cooperates with the positioning hole of the valve body 100 to ensure that the valve core always moves in a straight line.

[0058] Regarding the shape and structure of the first elastic part 300, in detail:

[0059] The first elastic part 300 is arranged in the pump head 600, and the first elastic part 300 includes an intake valve spring seat 310 and a first spring body 320. The intake valve spring seat 310 is connected to the valve body 100. Specifically, the end of the valve body 100 has an external thread, which is connected to the intake valve spring seat 310 through the thread; the end of the first valve core body 210 away from the valve body 100 is inserted into the seat body of the intake valve spring seat 310, and can slide relative to the intake valve spring seat 310. One end of the first spring body 320 is sleeved on the outside of the seat body of the intake valve spring seat 310, and the other end is connected to the first valve core body 210. Specifically, a first step 211 is provided on one side of the first valve core body 210 close to the seat body of the intake valve spring seat 310, and the first spring body 320 is sleeved on the first step 211.

[0060] Among them, the second valve core body 410 is designed with positioning structures at the front and back. The front end is a pin shaft structure connected to the positioning hole of the seat body in the discharge valve spring seat 510, and the rear end is designed with a cross groove structure, which cooperates with the positioning hole of the valve body 100 to ensure that the valve core always moves in a straight line.

[0061] Regarding the shape and structure of the second valve core portion 400, in detail:

[0062] The second valve core portion 400 is arranged in the pump head 600, and the end of the second valve core portion 400 is inserted into the liquid outlet cavity 140 of the valve body 100 away from the end of the first elastic portion 300, and the contact surface between the middle part of the second valve core portion 400 and the valve body 100 is set as a conical surface, and the other end of the second valve core portion 400 is inserted into the second elastic portion 500. The second valve core portion 400 can move relative to the valve body 100 and the second elastic portion 500.

[0063] Specifically, the second valve core part 400 includes a second valve core body 410 and a second sealing ring 420. One end of the second valve core body 410 is inserted into the valve body 100 and can slide relative to the valve body 100, and the other end is inserted into the second elastic part 500. The second sealing ring 420 is sleeved on the second valve core body 410, and the side of the second sealing ring 420 close to the valve body 100 is set as a second conical surface 421. The side of the valve body 100 that contacts the second sealing ring 420 is set as a conical surface, and the conical surface of the valve body 100 is adapted to the curvature of the second conical surface 421 of the second sealing ring 420. The second valve core body 410 contacts the valve body 100 through the second sealing ring 420 to avoid iron-to-iron contact between the second valve core body and the valve body 100 during operation.

[0064] Regarding the shape and structure of the second elastic portion 500, in detail:

[0065] The second elastic part 500 is arranged in the pump head 600, and the second elastic part 500 includes a discharge valve spring seat 510 and a second spring body 520. The discharge valve spring seat 510 is connected to the valve body 100. Specifically, the end of the valve body 100 has an external thread and is connected to the discharge valve spring seat 510 through the thread; the end of the second valve core body 410 away from the valve body 100 is inserted into the seat body of the discharge valve spring seat 510, and can slide relative to the suction valve spring seat 310. One end of the second spring body 520 is sleeved on the outside of the seat body of the discharge valve spring seat 510, and the other end is connected to the second valve core body 410. Specifically, a second step 411 is provided on the side of the second valve core body 410 close to the seat body of the discharge valve spring seat 510, and the second spring body 520 is sleeved on the second step 411.

[0066] In an optional embodiment, a threaded interface is provided on the discharge valve spring seat 510 , so that the entire valve assembly can be easily disassembled from the pump head 600 by using special tools.

[0067] In an optional embodiment, the first valve core body 210, the second valve core body 410 and the valve body 100 need to be specially treated (such as quenching and tempering treatment) to ensure the strength of use; the first valve core body 210, the second valve core body 410, the discharge valve spring seat 510, and the suction valve spring seat 310 can be realized by casting, processing and round steel direct processing according to the on-site use requirements and working conditions;

[0068] Reference Figure 2, the anti-sand valve group in this embodiment is installed as a whole in the pump head 600, and a clamping flange 800 is connected to one end of the pump head 600 close to the discharge valve spring seat 510; in order to reinforce one end of the suction valve, a suction valve fixing seat 700 is also installed in the pump head 600, and the suction valve fixing seat 700 is arranged on the outside of the suction valve spring seat 310. A first cavity is formed between the suction valve fixing seat 700 and the suction valve spring seat 310. When the first valve core body 210 is in an open state, the liquid inlet cavity 130 of the valve body 100 is connected to the first cavity, and the first cavity is connected to the liquid outlet hole 120 of the valve body 100. A second cavity is formed between the inner wall of the pump head 600 and the discharge valve spring seat 510. When the second valve core body 410 is in an open state, the liquid outlet cavity 140 of the valve body 100 is connected to the second cavity.

[0069] When the anti-sand valve group in this embodiment is in the liquid-intake state, the conical surface of the first sealing ring 220 does not contact the valve body 100, that is, the first valve core 200 is in the open state, the first spring body 320 is compressed, and the flow direction of the liquid is: Figure 2 (The direction of the arrow in the figure is the direction of liquid flow), the liquid flows into the liquid inlet hole 110 from the liquid inlet 620, and then flows into the liquid inlet cavity 130 of the valve body 100, and flows out to the first cavity through the conical surface gap of the first valve core part 200; when the anti-sand valve group in this embodiment is in the liquid discharge state, the conical surface of the second valve core part 400 does not contact the valve body 100, that is, the second valve core part 400 is in the open state, the second spring body 520 is compressed, and the liquid flowing through the conical surface gap of the first sealing ring 220 enters the first cavity, and then flows into the liquid outlet cavity 140 through the liquid outlet hole 120, passes through the conical surface gap of the second valve core part 400, enters the second cavity, and is finally discharged from the discharge port 610 of the pump head 600.

[0070] In actual use, according to the actual outlet pressure and displacement on site, a suitable anti-sand valve group is selected. First, a sealing ring is installed on the valve core, and the valve core with the sealing ring is installed at both ends of the valve body 100. The spring is installed in the suction valve spring seat 310 and the discharge valve spring seat 510, and the other end of the spring is installed on the positioning step of the valve core. The suction valve spring seat 310 and the discharge valve spring seat 510 are connected to the valve body 100 through threads. The installed valve assembly is assembled into the pump head 600 and used together with the plunger pump. The valve body 100 is provided with a liquid inlet hole 110 and a liquid outlet hole 120. During normal operation, under the action of the inlet pressure, the suction end valve core (i.e., the first valve core body 210) controls the inlet flow through the movement of the spring. Through the reciprocating motion of the plunger, the inhaled water is pumped into the discharge valve end of the valve group, and the valve core at the discharge end (i.e., the second valve core body 410) controls the flow of the discharge port 610 through the movement of the spring.

[0071] The anti-sand valve group provided in this embodiment is connected by a threaded form, which is simple to operate and easy to disassemble and assemble; the contact surface between the valve core and the valve body 100 is in the form of a cone, which utilizes the characteristic of the cone surface that is conducive to the flow of particles, reduces the accumulation of particles on the sealing surface, reduces the wear on the sealing surface, and at the same time reduces the wear of the valve body 100 by the high-pressure medium, thereby increasing the life of the valve group; a sealing ring with higher hardness is installed on the valve core to prevent iron-to-iron contact between the valve core and the valve body 100, reduce the vibration of the plunger pump, solve the problem of the valve group being stuck due to sewage containing mud and sand entering the plunger pump, reduce the replacement frequency of the valve group, and improve the working efficiency of the plunger pump.

[0072] Since the technical effect of the plunger pump provided in this embodiment is the same as the technical effect of the anti-sand valve group provided in the above embodiment, it will not be described in detail here.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An anti-sand valve group, characterized in that: include: A valve body (100), a first valve core portion (200), a first elastic portion (300), a second valve core portion (400) and a second elastic portion (500); The valve body (100), the first valve core portion (200), the first elastic portion (300), the second valve core portion (400) and the second elastic portion (500) are all arranged in a pump head (600); One end of the valve body (100) is connected to the first elastic part (300), and the other end is connected to the second elastic part (500); The end of the first valve core part (200) is inserted into the liquid inlet cavity (130) of the valve body (100), the contact surface between the middle part of the first valve core part (200) and the valve body (100) is set as a conical surface, the other end of the first valve core part (200) is inserted into the first elastic part (300), and the first valve core part (200) can move relative to the valve body (100) and the first elastic part (300); The end of the second valve core part (400) is inserted into the liquid outlet cavity (140) at one end of the valve body (100) away from the first elastic part (300), the contact surface between the middle part of the second valve core part (400) and the valve body (100) is set as a conical surface, the other end of the second valve core part (400) is inserted into the second elastic part (500), and the second valve core part (400) can move relative to the valve body (100) and the second elastic part (500); The valve body (100) is provided with a liquid inlet hole (110) and a liquid outlet hole (120), the liquid inlet hole (110) is communicated with the liquid inlet cavity (130), and the liquid outlet hole (120) is communicated with the liquid outlet cavity (140); When the anti-sand valve assembly is in a liquid-intake state, the conical surface of the first valve core part (200) does not contact the valve body (100), the first valve core part (200) is in an open state, and liquid flows into the liquid inlet cavity (130) from the liquid inlet hole (110) and flows out through the conical surface gap of the first valve core part (200); When the anti-sand valve group is in a liquid discharge state, the conical surface of the second valve core part (400) is not in contact with the valve body (100), and the second valve core part (400) is in an open state. The liquid flowing through the conical surface gap of the first valve core part (200) flows into the liquid outlet cavity (140) through the liquid outlet hole (120), passes through the conical surface gap of the second valve core part (400), and is discharged from the liquid discharge port (610) of the pump head (600).

2. The anti-sand valve assembly according to claim 1, characterized in that: The first valve core part (200) comprises a first valve core body (210) and a first sealing ring (220); One end of the first valve core body (210) is inserted into the valve body (100), and the other end is inserted into the first elastic part (300); The first sealing ring (220) is sleeved on the first valve core body (210), and a side of the first sealing ring (220) close to the valve body (100) is provided as a first conical surface (221).

3. The anti-sand valve assembly according to claim 2, characterized in that: A surface of the valve body in contact with the first sealing ring (220) is arranged as a conical surface, and the conical surface of the valve body is adapted to the curvature of the first conical surface (221) of the first sealing ring (220).

4. The anti-sand valve assembly according to claim 1, characterized in that: The second valve core part (400) comprises a second valve core body (410) and a second sealing ring (420); One end of the second valve core body (410) is inserted into the valve body (100), and the other end is inserted into the second elastic part (500); The second sealing ring (420) is sleeved on the second valve core body (410), and a side of the second sealing ring (420) close to the valve body (100) is provided as a second conical surface (421).

5. The anti-sand valve assembly according to claim 4, characterized in that: The surface of the valve body that contacts the second sealing ring (420) is arranged as a conical surface, and the conical surface of the valve body is adapted to the curvature of the second conical surface (421) of the second sealing ring (420).

6. The anti-sand valve assembly according to claim 2, characterized in that: The first elastic part (300) includes a suction valve spring seat (310) and a first spring body (320); The suction valve spring seat (310) is connected to the valve body (100), and one end of the first valve core body (210) away from the valve body (100) is inserted into the seat body of the suction valve spring seat (310); One end of the first spring body (320) is sleeved on the outside of the seat body of the suction valve spring seat (310), and the other end is connected to the first valve core body (210).

7. The anti-sand valve assembly according to claim 6, characterized in that: A first step (211) is provided on one side of the first valve core body (210) close to the seat body of the suction valve spring seat (310), and the first spring body (320) is sleeved on the first step (211).

8. The anti-sand valve assembly according to claim 4, characterized in that: The second elastic part (500) includes a discharge valve spring seat (510) and a second spring body (520); The discharge valve spring seat (510) is connected to the valve body (100), and one end of the second valve core body (410) away from the valve body (100) is inserted into the seat body of the discharge valve spring seat (510); One end of the second spring body (520) is sleeved on the outside of the seat body of the discharge valve spring seat (510), and the other end is connected to the second valve core body (410).

9. The anti-sand valve assembly according to claim 8, characterized in that: A second step (411) is provided on one side of the second valve core body (410) close to the seat body of the discharge valve spring seat (510), and the second spring body (520) is sleeved on the second step (411).

10. A plunger pump, characterized in that: It comprises the anti-sand valve group as described in any one of claims 1 to 9.

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