WO2023097846A1

WO2023097846A1 - Valve group, hydraulic end and reciprocating pump

Info

Publication number: WO2023097846A1
Application number: PCT/CN2021/141941
Authority: WO
Inventors: 张国庆; 姜一博; 左文龙; 李海龙
Original assignee: 烟台杰瑞石油服务集团股份有限公司
Priority date: 2021-11-30
Filing date: 2021-12-28
Publication date: 2023-06-08
Also published as: CN114151324A

Abstract

The present invention relates to the technical field of reciprocating pumps, in particular to a valve group, a hydraulic end and a reciprocating pump. The reciprocating pump comprises the hydraulic end and a power end, wherein the hydraulic end comprises a valve box and the valve group, the valve box is provided with a valve cavity, the valve group comprises a first valve group and a second valve group, the first valve group and the second valve group are installed in the valve cavity, the first valve group and the second valve group are arranged separately, the first valve group comprises a first shell, the first shell is provided with a first opening along the axis of the first shell, a first valve body and a first base body are oppositely installed in the first opening, the first valve group further comprises a first elastic member, the first elastic member is located between the first valve body and the first base body, the side provided with the first base body is connected to a first pressing cover by means of one end of the first opening, the second valve group comprises a second shell, the second shell is provided with a second opening along the axis of the second shell, a second valve body and a second base body are oppositely installed in the second opening, the second valve group further comprises a second elastic member, and the second elastic member is located between the second valve body and the second base body.

Description

Valve block, liquid end and reciprocating pump

This application claims the priority of the Chinese patent application with the application number 202111446581.8 and the invention titled "Valve Group, Fluid End and Reciprocating Pump" submitted to the Patent Office of the State Intellectual Property Office of China on November 30, 2021, the entire content of which Incorporated in this application by reference.

technical field

The invention relates to the technical field of reciprocating pumps, in particular to a valve group, a fluid end and a reciprocating pump.

Background technique

The reciprocating pump is a mechanical device that relies on the reciprocating movement of the plunger in the valve chamber to change the working volume in the valve chamber alternately to convert mechanical energy into fluid pressure energy. The reciprocating pump includes a liquid end and a power end. The liquid end is used to convert mechanical energy into fluid pressure energy through the movement of the plunger. It is a very important part of converting low-pressure fluid into high-pressure fluid. The power end is used to convert the original energy Passed to the liquid end to provide power for the reciprocating pump.

The valve box of the hydraulic end is equipped with vulnerable parts such as plungers and valve groups. It is necessary to check whether these are damaged at intervals of one end. If damaged, it needs to be repaired or replaced in time. However, for the existing liquid end, due to the scattered structure of each part of the valve group, each part needs to be disassembled in sequence during the maintenance or replacement process, which is not only inconvenient to disassemble, time-consuming and laborious, but also easily causes secondary damage to the parts , which is very unfavorable to the normal disassembly and assembly operations and affects the efficiency of disassembly and assembly.

Or as the patent No. CN109989912B discloses an integrated valve group for petroleum reciprocating pumps, including a cylindrical valve body, the upper part of the valve body has a straight hole along the central axis and the upper part is connected to the upper gland, and the lower part of the straight hole is coaxial There is a tapered hole in communication, and the lower part of the tapered hole is connected with a stepped hole. The upper valve body is installed on the upper part of the stepped hole, and the upper valve spring is installed between the upper valve body and the lower gland; the lower part of the stepped hole is connected to the lower valve seat. There is a tapered hole a on the middle axis of the lower valve seat, and the tapered hole a is coaxially connected with the straight hole a. The straight hole a is installed with a lower valve body, and a lower valve spring is installed between the lower valve body and the step; There is a first through hole, and the step hole has a second through hole on the side wall at the upper part of the step, and a third through hole on the side wall at the lower part of the step. There is a section with the largest outer diameter in the middle of the outer wall of the valve body, with the largest The segment is between the first through hole and the second through hole. This one-piece valve group realizes integral disassembly and assembly by adopting an integral shell, but there are still problems that the position of the plunger needs to be adjusted during disassembly and assembly, and the valve group needs to be replaced as a whole if damaged.

Contents of the invention

The main purpose of the present invention is to provide a valve group, a reciprocating pump and a disassembly method of the reciprocating pump, aiming to realize the rapid installation of the valve group in the hydraulic end, so as to solve the time-consuming, laborious and difficult disassembly of the existing valve group Higher, easy to cause secondary damage.

In order to achieve the above technical problems, the present invention provides a valve group, the valve group includes a first valve group and a second valve group, the first valve group and the second valve group are integrally arranged, the first valve group The set includes a first shell, and the first shell is provided with a first opening along its axis, and a first valve body and a first seat are relatively installed in the first opening, and the first valve group is also Including a first elastic member, the first elastic member is located between the first valve body and the first seat body, and the side on which the first seat body is installed passes through the first opening One end is connected with a first gland, and the second valve group includes a second housing, and the second housing is provided with a second opening along its axis, and a second Valve body is relatively installed in the second opening. and a second seat body, the second valve group further includes a second elastic member, and the second elastic member is located between the second valve body and the second seat body.

Optionally, the first valve group further includes a first valve seat, the other end of the first opening is connected to the first valve seat, and the first valve body is installed on the first valve seat. In the seat, and the first valve body is matched with the installation tapered surface of the first valve seat;

The second valve group also includes a second valve seat, one end of the second opening is connected to the second valve seat, the second valve body is installed in the second valve seat, and The second valve body cooperates with the installation taper surface of the second valve seat.

Optionally, the first valve group further includes a first seal, the first seal is located between the first housing and the first valve seat;

The second valve group also includes a second seal located between the second housing and the second valve seat.

Optionally, the first seat body is connected to the first gland and is located on the side of the first gland facing the first valve body, and one end of the first elastic member is sleeved on the The other end of the first elastic member is sleeved on the first seat and abuts against the first gland.

Optionally, the first gland is in clearance fit with the first casing, and the first valve group further includes a third sealing element, the third sealing element is located between the first casing and the first pressure casing. between covers.

Optionally, the second seat body is fixed in the second shell and is located at the other end of the second opening, the second seat body has a stepped surface, and one end of the second elastic member is sleeved On the second valve body, the other end of the second elastic member is sleeved on the second base body and abuts against the stepped surface.

In addition, the present invention also provides a fluid end, the fluid end includes a valve box and a valve group as described in any one of the above, the valve box has a valve chamber, the first valve group and the second valve group The valve group is installed in the valve cavity.

Optionally, the fluid end further includes a first pressure cap, the first pressure cap is connected with the valve box and presses against the first valve group.

Optionally, the liquid end further includes a second gland and a second gland, the second gland is arranged on one side of the second valve group facing the second valve group, and the The second gland is in sealing connection with the valve box, and the second gland is connected with the valve box and presses against the second gland and the second valve group.

The present invention further provides a reciprocating pump. The reciprocating pump includes the liquid end and the power end as described in any one of the above.

The beneficial effects of the present invention are as follows: for the valve group of the hydraulic end, since the first valve group and the second valve group are two integral components, it is only necessary to take out the first valve group and the The second valve group can be repaired or replaced without the need to disassemble and assemble each part of the valve group in turn. For the parts of the first valve group and the second valve group, they can be disassembled or replaced in the corresponding workshop, so that the hydraulic end On-site maintenance becomes very convenient, saves time and effort, and at the same time avoids secondary damage to various parts of the valve group. Moreover, the first valve group and the second valve group adopt a split arrangement, that is, the first valve group and the second valve group The groups are two separate components, so that the first valve group and the second valve group can be disassembled in turn without adjusting the position of the plunger in the middle of the first valve group and the second valve group, so that the entire valve group It is more convenient to disassemble and assemble, which effectively reduces the difficulty of disassembly and assembly and improves the efficiency of disassembly and assembly. At the same time, only the damaged first valve group or the second valve group needs to be replaced separately during maintenance, avoiding the need for the first valve group and the second valve group. The problem of simultaneous replacement of the second valve group with different service life prevents waste of parts.

Description of drawings

The advantages of the above and/or additional aspects of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is the structural representation of the hydraulic end of reciprocating pump of the present invention;

Fig. 2 is a schematic structural view of the first valve group of the liquid end in Fig. 1;

Fig. 3 is a schematic structural view of the second valve group of the fluid end in Fig. 1;

Among them, the corresponding relationship between reference numerals and part names in Fig. 1 to Fig. 3 is:

10. The first valve group; 11. The first shell; 111. The first through hole; 12. The first valve body; 13. The first seat; 14. The first elastic member; 15. The first gland; 151 , the first threaded hole; 16, the first valve seat; 17, the first seal; 18, the third seal;

20. The second valve group; 21. The second shell; 211. The second through hole; 22. The second valve body; 23. The second seat body; 24. The second elastic member; 25. The second valve seat; 26. The second seal;

30. The first pressing cap;

40. Second gland;

50. The second pressure cap;

60, plunger;

70. Valve box; 71. Discharge channel;

80. Packing components.

Detailed ways

In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description. It is not intended to indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and operate in a particular orientation, and thus should not be construed as limiting the invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "communication", and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; may be mechanically connected, may also be electrically connected; may be directly communicated, may also be indirectly communicated through an intermediary, and may be internally communicated between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the prior art, for the disassembly of the valve group at the hydraulic end, the traditional method is to use tools to first disassemble the gland and the gland, and then disassemble the various parts such as the valve body, the seat body and the elastic member in sequence. Because the plunger needs to be adjusted to the proper position before the parts are disassembled, and a variety of tools need to be used on site during the disassembly process, such as nut wrench and puller to disassemble the gland, and puller to disassemble the seat body etc., because the liquid end itself is relatively large and heavy, and other equipment interferes with the on-site operation, it is very time-consuming and laborious to disassemble the valve group, and it is also very time-consuming and laborious to reinstall after disassembly.

To this end, an embodiment of the present invention provides a hydraulic end valve group, as shown in Figures 1 to 3, the valve group includes a first valve group 10 and a second valve group 20, the first valve group 10 and the second valve group The group 20 is arranged separately, and both the first valve group 10 and the second valve group 20 are integrally arranged. In a specific embodiment, the first valve group 10 includes a first housing 11, the first housing 11 is a cylindrical structure, the first housing 11 is provided with a first opening along its axis, and a The first valve body 12 and the first seat body 13, the first valve body 12 adopts a general-purpose rotary body structure, the first valve group 10 also includes a first elastic member 14, and the first elastic member 14 is located on the first valve body 12 and the first seat body 13, and the first seat body 13 is installed on one end of the first opening to connect with the first gland 15, that is, the first valve group 10 is composed of the first valve body 12 , the first elastic member 14, the first seat body 13 and the first gland 15 are sequentially installed in the integral valve group formed in the first opening of the first housing 11, and the side wall of the first housing 11 is also provided with The first through hole 111, the first through hole 111 allows high-pressure fluid to be discharged from the first housing 11, the second valve group 20 adopts a structure similar to the first valve group 10, the second valve group 20 includes the second housing 21, the second valve group 20 The second housing 21 is a cylindrical structure, and the second housing 21 is provided with a second opening along its axis, and a second valve body 22 and a second seat body 23 are relatively installed in the second opening, and the second valve body 22 Adopting a common rotary body structure, the second valve group 20 also includes a second elastic member 24, and the second elastic member 24 is located between the second valve body 22 and the second seat body 23, that is, the second valve group 20 is composed of The second valve body 22, the second elastic member 24 and the second seat body 23 are sequentially installed in the integral valve group formed in the second opening of the second housing 21, and the side wall of the second housing 21 is also provided with The second through hole 211 allows the low-pressure fluid to flow into the valve chamber from the second housing 21 .

For the valve groups at the fluid end mentioned above, since the first valve group 10 and the second valve group 20 are two integral components, it is only necessary to take out the first valve group 10 and the second valve group respectively from the valve cavity during maintenance. 20 can be repaired or replaced, without the need to disassemble and assemble each part of the valve group in turn, and for the parts of the first valve group 10 and the second valve group 20, they can be disassembled or replaced in the corresponding workshop, so that the hydraulic end On-site maintenance becomes very convenient, saves time and effort, and at the same time avoids secondary damage to various parts of the valve group. Moreover, the first valve group 10 and the second valve group 20 adopt a separate arrangement, that is, the first valve group 10 and the second valve group 20 are arranged separately. The second valve group 20 is two separate components, so that the first valve group 10 and the second valve group 20 can be disassembled in turn without adjusting the plunger between the first valve group 10 and the second valve group 20 60 position, so that the disassembly and assembly of the entire valve group is more convenient, effectively reducing the difficulty of disassembly and assembly, and improving the efficiency of disassembly and assembly. It only needs to be replaced, which avoids the problem of simultaneous replacement of the first valve group 10 and the second valve group 20 due to different life spans, and prevents waste of parts.

It should be noted that, in this embodiment, in order to facilitate disassembly and assembly of the first valve group 10 and the second valve group 20, the first housing 11 and the second housing 21 are both thin-walled housings, that is, the first housing 11 and the second housing 20 are both thin-walled housings. The thickness of the second shell 21 can be neglected. In this way, it can avoid the increase of the thickness of the first valve group 10 or the second valve group 20 due to the increase of the shell, which will affect the disassembly and assembly of the valve group or cause the overall volume of the liquid end to increase. In addition, the first valve group 10 or the second valve group can be lightened. The weight of the valve group 20 saves shell materials and reduces production costs.

In this embodiment, the first valve group 10 also includes a first valve seat 16, the other end of the first opening is connected to the first valve seat 16, and the first valve body 12 is installed in the first valve seat 16 , and the first valve body 12 fits with the first valve seat 16 mounting taper. The first valve group 10 provides a convenient installation position for the first valve body 12 by setting the first valve seat 16, so that if damage occurs, only the first valve seat 16 needs to be replaced separately, and the second valve body 12 can be avoided. A valve body 12 is directly installed in the first casing 11 to cause the problem that the whole first casing 11 needs to be replaced in case of damage, which is beneficial to reduce the cost. Specifically, in the first housing 11 of the first valve group 10, the first valve seat 16 is snap-fitted with the first housing 11 through a stepped surface in the first housing 11, and the supporting legs of the first valve body 12 Located in the straight hole of the first valve seat 16, it acts as a guide for moving up and down. The valve body apron of the first valve body 12 is located in the tapered hole of the first valve seat 16 and the first valve body Seat 16 forms a fitting taper surface for sealing and forming a high-pressure fluid discharge check valve sealing pair, wherein the end with the larger inner diameter of the tapered hole faces upward. When the fluid presses the first valve body 12 upwards, the first valve body 12 acts on the first elastic member 14, the first elastic member 14 is compressed, and the connection between the first valve body 12 and the first valve seat 16 The conical surface between them is opened, and the fluid passes through. When the pressure of the fluid decreases, the first elastic member 14 resets, and the conical surface closes to play a sealing role.

In this embodiment, the second valve group 20 also includes a second valve seat 25, one end of the second opening is connected to the second valve seat 25, and the second valve body 22 is installed in the second valve seat 25, And the second valve body 22 cooperates with the installation taper surface of the second valve seat 25 . The second valve group 20 provides a convenient installation position for the second valve body 22 by setting the second valve seat 25, so that if damage occurs, only the second valve seat 25 needs to be replaced separately, and the second valve body 25 can be avoided. The second valve body 22 is directly installed in the second casing 21 to cause the problem that the entire second casing 21 needs to be replaced in case of damage, which is beneficial to reduce the cost. Specifically, in the second housing 21 of the second valve group 20, the second valve seat 25 is snap-fitted with the second housing 21 through a stepped surface in the second housing 21, and the supporting legs of the second valve body 22 Located in the straight hole of the second valve seat 25, it acts as a guide for moving up and down. The valve body apron of the second valve body 22 is located in the tapered hole of the second valve seat 25 and the second valve body The seat 25 forms a fitting taper surface, which is used to seal the low-pressure fluid flowing into the sealing pair of the one-way valve, wherein the end with the larger inner diameter of the tapered hole faces upward. When a vacuum is formed in the valve cavity, the second elastic member 24 is compressed, the conical surface between the second valve body 22 and the second valve seat 25 is opened, and the fluid passes through. When the pressure of the fluid increases, the second elastic Part 24 is reset, and the conical surface is closed to play a sealing role.

In this embodiment, the first valve group 10 further includes a first sealing member 17 , and the first sealing member 17 is located between the first housing 11 and the first valve seat 16 . Specifically, an annular sealing groove is formed circumferentially at the joint position of the first valve seat 16 and the first housing 11 , and the first sealing member 17 is installed in the sealing groove. The installation space is provided for the first sealing member 17 by opening the sealing groove, and then the sealing between the first valve seat 16 and the first housing 11 is realized through the first sealing member 17, so as to prevent high-pressure fluid from entering and damaging other parts, among which , the first sealing member 17 is a sealing ring. Similarly, in this embodiment, the second valve group 20 further includes a second seal 26 , and the second seal 26 is located between the second housing 21 and the second valve seat 25 . Specifically, an annular sealing groove is formed at the joint position of the second valve seat 25 and the second housing 21 in the circumferential direction, and the second sealing member 26 is installed in the sealing groove. The installation space is provided for the second sealing member 26 by opening the sealing groove, and then the sealing between the second valve seat 25 and the second housing 21 is realized through the second sealing member 26, so as to prevent the low-pressure fluid from entering and damaging other parts, among which , the second sealing member 26 is a sealing ring.

In this embodiment, the first seat body 13 is connected to the first gland 15 and is located on the side of the first gland 15 facing the first valve body 12, and one end of the first elastic member 14 is sleeved on the first valve body. On the body 12 , the other end of the first elastic member 14 is sleeved on the first seat body 13 and abuts against the first gland 15 . Specifically, the first seat body 13 and the first gland 15 form a convex structure, and a stepped surface is formed on the first valve body 12, so as to realize the passage between the first seat body 13 and the first valve body 12. An elastic connection of the elastic member 14 . Moreover, in this embodiment, the first seat body 13 and the first pressing cover 15 are integrally formed to facilitate production and processing.

Further, in this embodiment, the first pressing cover 15 is in clearance fit with the first housing 11 . For the first valve group 10, when assembling, the first valve seat 16, the first valve body 12, the first elastic member 14, the first seat body 13 and the first gland 15 are sequentially installed on the first housing 11. In the first opening, the first valve seat 16 is clamped on the other end of the first housing 11, and when the first gland 15 is installed with a gap between the first housing 11 and one end of the first housing 11, the integral valve is made. Group. By adopting the clearance fit method, on the one hand, the assembly and disassembly process is smoother, and on the other hand, damage to the first shell 11 or the first pressing cover 15 can be avoided. Moreover, in this embodiment, the first valve group 10 further includes a third sealing member 18 , and the third sealing member 18 is located between the first casing 11 and the first gland 15 . Specifically, an annular sealing groove is formed circumferentially at the joint position of the first gland 15 and the first housing 11 , and the third sealing member 18 is installed in the sealing groove. The installation space is provided for the third sealing member 18 by opening the sealing groove, and then the sealing between the first gland 15 and the first housing 11 is realized through the third sealing member 18, wherein the third sealing member 18 is a sealing ring .

Furthermore, in this embodiment, a first threaded hole 151 is opened on the side of the first gland 15 facing outside the first opening. Through the first threaded hole 151, the first valve group 10 can be easily pulled out during disassembly.

In this embodiment, the second seat body 23 is fixed in the second shell 21 and is located at the other end of the second opening. The second seat body 23 has a stepped surface, and one end of the second elastic member 24 is sleeved on the second hole. On the body 22, the other end of the second elastic member 24 is sleeved on the second seat body 23 and abuts against the step surface. Specifically, a stepped surface is also formed on the second valve body 22 , so as to realize the elastic connection between the second seat body 23 and the second valve body 22 through the second elastic member 24 . For the second valve group 20, when assembling, the second valve seat 25, the second valve body 22, the second elastic member 24 and the second seat body 23 are sequentially installed in the second opening of the second housing 21 , the second valve seat 25 is clamped at one end of the second shell 21, and the second seat body 23 is clamped at the other end of the second shell 21, that is, the integral valve block is made.

Another embodiment of the present invention provides a fluid end including the above valve group, the fluid end also includes a valve box 70, the valve box 70 has a valve cavity, and the first valve group 10 and the second valve group 20 are installed in the valve cavity . The hydraulic end adopts the above-mentioned valve group, that is, the first valve group 10 and the second valve group 20 are arranged separately, and both the first valve group 10 and the second valve group 20 are integrally arranged, so that in the valve group There is no need to adjust the position of the plunger 60 during the disassembly process, which is convenient for the first valve group 10 and the second valve group 20 to be disassembled from the valve cavity or installed in the valve cavity respectively, which is more convenient for disassembly and assembly, and improves the efficiency of disassembly and assembly .

In this embodiment, a first port is opened on the top of the valve box 70, a second port is opened on the left side of the valve box 70, a third port is opened on the bottom of the valve box 70, and the first port , the second port and the third port communicate with each other, wherein the axes of the first port and the third port are on the same straight line, and the axes of the first port and the third port are perpendicular to the axis of the second port axis, the first valve group 10 and the second valve group 20 are respectively installed at the first port and the third port, the valve box 70 also includes a plunger 60, the plunger 60 is installed at the second port, and the fluid end A packing assembly 80 is also included. The packing assembly 80 is located at the connection position between the plunger 60 and the valve box 70 . The packing assembly 80 is used for sealing between the plunger 60 and the valve box 70 . In addition, in this embodiment, a discharge hole 71 communicating with the first through hole 111 on the first shell 11 is formed inside the valve box 70 , and the high-pressure fluid can be discharged out of the valve box 70 through the discharge hole 71 .

In this embodiment, the fluid end further includes a first pressure cap 30 , and the first pressure cap 30 is connected with the valve box 70 and presses against the first valve group 10 . Specifically, the bottom of the first valve group 10 is engaged with the stepped surface of the valve box 70, the first pressure cap 30 is arranged on the top of the first gland 15, the first pressure cap 30 is screwed to the valve box 70, and the first pressure cap 30 is screwed to the valve box 70. The cap 30 abuts against the first pressing cap 15 to press the first valve group 10 tightly, wherein the first pressing cap 30 mainly plays a fixing role. Therefore, when disassembling the first valve group 10, the first pressure cap 30 is disassembled first, and then the whole first valve group 10 is easily taken out through the first threaded hole 151 of the first gland 15, and vice versa for installation. It is very easy to disassemble and assemble. In addition, in this embodiment, in order to facilitate the disassembly and assembly of the first pressing cap 30 , a second threaded hole is opened on the outward side of the first pressing cap 30 .

In this embodiment, the liquid end further includes a second gland 40 and a second gland 50, the second gland 40 is arranged on the right side of the second valve group 20 facing the second valve group 20, and the second pressure cap The cover 40 is in sealing connection with the valve box 70 , and the second pressing cap 50 is connected with the valve box 70 and presses against the second pressing cover 40 and the second valve group 20 . Specifically, the left side of the second valve group 20 is engaged with the stepped surface of the valve box 70, the second gland 40 is arranged on the right side of the second valve group 20 and abuts against the second valve group 20, and the second pressure The cover 40 is in clearance fit with the valve box 70, and the sealing effect is realized by the fourth sealing member arranged between the second gland 40 and the valve box 70, wherein the sealing structure of the fourth sealing member is the same as that of the third sealing member 18, and the second The pressure cap 50 is arranged on the right side of the second gland 40, and the second gland 50 is threadedly connected with the valve box 70, and the second gland 50 abuts against the second gland 40 so that the second gland 40 and the second The valve group 20 is compressed, wherein the second gland 40 mainly plays a sealing role, and the second pressure cap 50 mainly plays a fixing role. In this way, for the liquid end, since the second gland 40 and the second gland 50 are not on the same straight line as the plunger 60, but are arranged on the right side facing the second valve group 20, it is convenient for the second valve group 20 to The whole is taken out horizontally from the position of the second gland 40 and the second gland 50, so when disassembling the second valve group 20, the second gland 50 and the second gland 40 are first disassembled in sequence, and then the second valve Group 20 can be taken out directly from the right side conveniently as a whole, and vice versa for installation, and disassembly and assembly are very simple. In addition, in this embodiment, in order to facilitate the disassembly and assembly of the second gland 40 and the second gland 50, the outer sides of the second gland 40 and the second gland 50 are respectively provided with a third threaded hole and a Fourth threaded hole.

In addition, in this embodiment, it should be noted that since the hydraulic end is mainly used for maintenance of various parts of the valve group, and the plunger 60 is not easy to be damaged, the gland and the gland facing the plunger 60 are omitted. In this way, the overall structure of the entire fluid end is simpler.

Another embodiment of the present invention provides a reciprocating pump including the fluid end described above, the reciprocating pump also includes a power end, and the valve box 70 is fixed on the body of the power end. In a specific embodiment, the power end is usually composed of a motor, a crankshaft connecting rod, a crosshead, etc. The rotational motion of the motor is converted into the reciprocating motion of the crosshead through the crankshaft connecting rod, and then the reciprocating motion of the crosshead drives the plunger 60 along the The reciprocating movement in the axial direction of the second port makes the working volume in the valve cavity constantly change.

Next, the disassembly and assembly method of the liquid end of the present invention will be further described, and the first valve seat 16, the first valve body 12, the first elastic member 14, the first seat body 13, and the first gland 15 are installed on the first valve body. The first valve group 10 is formed in the first opening of the casing 11, and the second valve seat 25, the second valve body 22, the second elastic member 24, and the second seat body 23 are installed on the second valve body 21 of the second casing 21. The second valve group 20 is formed in the two openings. When disassembling, first take out the first pressing cap 30, take out the first valve group 10 vertically from the position of the first pressing cap 30, take out the second pressing cap 50 and the second pressing cap 40, and take out the second pressing cap 40 and the second pressing cap 40. The position of the second pressure cap 50 takes out the second valve group 20 horizontally, and vice versa for installation. The disassembly method of the hydraulic end is simple, only need to disassemble the first pressure cap 30, the second pressure cap 50, the second pressure cap 40, the first valve group 10 and the second valve group 20 in sequence. There is no need to adjust the position of the plunger 60, saving manpower and time.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims

A valve group, characterized in that it comprises a first valve group (10) and a second valve group (20), and the first valve group (10) and the second valve group (20) are arranged separately;

The first valve group (10) includes a first housing (11), and the first housing (11) is provided with a first opening along its axis, and a first valve is relatively installed in the first opening. body (12) and first seat body (13), the first valve group (10) also includes a first elastic piece (14), and the first elastic piece (14) is located at the first valve body ( 12) Between the first seat body (13), and the side on which the first seat body (13) is installed is connected with a first gland (15) through one end of the first opening;

The second valve group (20) includes a second housing (21), and the second housing (21) is provided with a second opening along its axis, and a second valve is relatively installed in the second opening. body (22) and a second seat body (23), the second valve group (20) also includes a second elastic piece (24), and the second elastic piece (24) is located at the second valve body ( 22) and the second base (23).
The valve group according to claim 1, characterized in that, the first valve group (10) further comprises a first valve seat (16), and the other end of the first hole is connected to the first valve seat (16). seat (16), the first valve body (12) is installed in the first valve seat (16), and the first valve body (12) and the first valve seat (16) ) to fit the taper surface;

The second valve group (20) also includes a second valve seat (25), one end of the second opening is connected to the second valve seat (25), and the second valve body (22) It is installed in the second valve seat (25), and the second valve body (22) cooperates with the installation taper surface of the second valve seat (25).
The valve group according to claim 2, characterized in that, the first valve group (10) further comprises a first sealing member (17), and the first sealing member (17) is located in the first housing (11 ) and said first seat of Versus (16);

The second valve group (20) also includes a second seal (26), the second seal (26) is located between the second housing (21) and the second valve seat (25) .
The valve group according to claim 1, characterized in that, the first seat body (13) is connected with the first gland (15) and is located on the first gland (15) toward the first One side of the valve body (12), one end of the first elastic member (14) is sleeved on the first valve body (12), and the other end of the first elastic member (14) is sleeved It is on the first base body (13) and abuts against the first pressing cover (15).
The valve group according to claim 4, characterized in that, the first gland (15) is in clearance fit with the first housing (11), and the first valve group (10) also includes a third sealing member (18), the third seal (18) is located between the first casing (11) and the first gland (15).
The valve group according to claim 1, characterized in that, the second seat (23) is fixed in the second housing (21) and is located at the other end of the second opening, the second The seat body (23) has a stepped surface, one end of the second elastic member (24) is sleeved on the second valve body (22), and the other end of the second elastic member (24) is sleeved on the The second base body (23) is on and abuts against the stepped surface.
A hydraulic end, characterized in that it comprises a valve box (70) and the valve group according to any one of claims 1 to 6, the valve box (70) has a valve cavity, and the first valve group ( 10) and the second valve group (20) are installed in the valve cavity.
The liquid end according to claim 7, characterized in that, the liquid end further comprises a first pressure cap (30), and the first pressure cap (30) is connected with the valve box (70) and abuts against Tighten the first valve group (10).
The fluid end according to claim 7, characterized in that, the fluid end further comprises a second gland (40) and a second gland (50), the second gland (40) facing the The second valve group (20) is arranged on one side of the second valve group (20), and the second gland (40) is in sealing connection with the valve box (70), and the second gland (50) is connected with the valve box (70) and pressed against the second gland (40) and the second valve group (20).
A reciprocating pump, characterized by comprising the liquid end and the power end according to any one of claims 7 to 9.