CN111022283A

CN111022283A - Oil pressure sealing piston mud pump convenient for liquid mixing

Info

Publication number: CN111022283A
Application number: CN201911329688.7A
Authority: CN
Inventors: 毛传利; 张玉岭; 邵鹏飞
Original assignee: SHANDONG ZHONGTAN MACHINERY CO Ltd
Current assignee: SHANDONG ZHONGTAN MACHINERY CO Ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-04-17

Abstract

The invention discloses an oil pressure sealing piston mud pump convenient for liquid mixing, which comprises a hydraulic end and a power end, wherein the hydraulic end is connected with the power end; a plurality of liquid pumping systems are arranged between the hydraulic end and the power end; each liquid pumping system comprises a valve box component, a pull rod mounting sleeve and a transmission component; the transmission assembly comprises a pull rod, a pull rod sealing assembly, a piston rod, a piston and a piston horizontal position fine adjustment assembly; the pull rod is connected with the piston rod through a piston horizontal position fine adjustment assembly; the piston horizontal position fine adjustment assembly comprises a piston rod end cover, two half circular ring cylinder-shaped metal inner snap rings and two half circular ring cylinder-shaped elastic outer snap rings; the liquid inlet of each valve box component is respectively connected with a liquid inlet pipe; the liquid outlet of each valve box component is connected with the liquid outlet pipe. The mud pump can realize the interchange of single liquid, double liquid and multiple liquids, can realize the mixing of the liquids in different proportions, and has stable pumping pressure of the liquid pumping pump and uniform mixing of the liquids.

Description

Oil pressure sealing piston mud pump convenient for liquid mixing

Technical Field

The invention relates to the technical field of pumps, in particular to a piston mud pump.

Background

The mud pump is an important production device in the oil field industry, is an important component of drilling equipment, is mainly used for deep well and shallow well operation of an oil field, can complete water plugging and oil displacement operation to the oil well, can also be used for cement plugging, channeling sealing, well washing, sand washing and well cementation operation during oil field well repair, near and remote conveying pressure test of crude oil and the like, mixed mud solutions with different proportion requirements are required to be injected in the process, and the stroke of the existing multi-cylinder mud pump is fixed, so that the existing multi-cylinder mud pump is not suitable for actual conditions with different requirements on the mud solutions and the mixing requirements under different use environments.

The main cause of piston failure in mud pumps is wear of the piston. The abrasion of the piston causes the sealing performance of the piston to be reduced, so that high-pressure mud can enter the piston mounting sleeve more easily, and the abrasion failure of the piston is accelerated. The abrasion of the piston is usually caused by that the frictional lubrication performance is reduced due to poor sealing performance of the piston and a wear-resistant layer in a piston mounting sleeve, so that the piston works under the condition of high friction and becomes the most easily damaged part of the slurry pump. The piston, the sealing device, the liquid inlet valve, the liquid outlet valve and the like work under the working conditions of high temperature, high pressure and high speed, the service life of the devices is very short due to uneven pressure in a pump, most of the parts are made of metal materials, the surfaces of the parts are easy to corrode and abrade, the parts must be replaced periodically, and otherwise, the parts are easy to leak and partially easy to lose efficacy, so that potential safety hazards are caused. In addition, the wear-resistant layer in the piston mounting sleeve is replaced by a new piston, so that the piston mounting sleeve is usually required to be detached, and the time for stopping the pump is long. Pumps of the above type are therefore expensive to operate and maintain, and despite many solutions they have not been able to solve the problem at all times.

Disclosure of Invention

The invention aims to provide an oil pressure sealing piston mud pump convenient for liquid mixing, aiming at the defects of the prior art.

The technical scheme adopted by the invention is as follows.

An oil pressure sealing piston mud pump convenient for liquid mixing comprises a hydraulic end and a power end.

A plurality of liquid pumping systems are arranged between the hydraulic end and the power end.

Each liquid pumping system comprises a valve box component, a pull rod installation sleeve and a transmission component.

Each valve box component is arranged on the hydraulic end, and each pull rod mounting sleeve is arranged on the power end; the transmission assembly comprises a pull rod, a pull rod sealing assembly, a piston rod, a piston and a piston horizontal position fine adjustment assembly.

The valve box assembly comprises a valve box body, a liquid inlet and a liquid outlet which are arranged on the side wall of the valve box body, a valve box body inner cavity arranged in the valve box body, and a piston mounting sleeve which is arranged on the side wall of the valve box body close to the pull rod mounting sleeve side and is communicated with the valve box body inner cavity; the central axis of the piston plug mounting sleeve is transversely arranged.

The end of each piston rod, which is far away from the pull rod mounting sleeve, is positioned in the piston mounting sleeve, and the piston is mounted at the end of the piston rod, which is far away from the pull rod mounting sleeve; be equipped with feed liquor valve, play liquid valve in the valve box, the feed liquor valve links to each other with the inlet, goes out the liquid valve and links to each other its characterized in that with the liquid outlet:

the pull rod is connected with the piston rod through a piston horizontal position fine adjustment assembly; the pull rod is arranged on the pull rod mounting sleeve through a pull rod sealing device;

a piston mounting sleeve end cover is arranged on the piston mounting sleeve close to the pull rod mounting sleeve end in a threaded manner; a piston rod through hole is formed in the end cover of the piston mounting sleeve, and the piston rod penetrates through the piston rod through hole; the piston mounting sleeve is internally sleeved with a steel sleeve; the end of the steel sleeve, which is far away from the pull rod mounting sleeve, is contacted with the valve box body; a boss is arranged on the radial peripheral surface of the steel sleeve close to the end of the pull rod mounting sleeve; the end of the boss close to the valve box body is not contacted with the end of the piston mounting sleeve far away from the valve box body; the radial inner peripheral surface of the steel sleeve is provided with a wear-resistant layer; the end of the steel sleeve, which is close to the pull rod mounting sleeve, extends out of the piston mounting sleeve and is contacted with the end cover of the piston mounting sleeve; the steel sleeve is fixed in the piston mounting sleeve by rotating the end cover of the piston mounting sleeve.

The piston comprises a piston end cover, a first sealing body and a piston main body, wherein the piston end cover is arranged at the end, far away from the pull rod mounting sleeve, of the piston rod; the piston end cover is in threaded connection with the end, far away from the pull rod, of the piston main body, the first sealing body is extruded by rotating the piston end cover, and the first sealing body is made to cling to the radial inner peripheral surface of the steel sleeve.

The pull rod is connected to the pull rod mounting sleeve; the central axes of the pull rod and the piston rod are on the same straight line.

The piston horizontal position fine adjustment assembly comprises a piston rod end cover, two half circular ring cylinder-shaped metal inner snap rings and two half circular ring cylinder-shaped elastic outer snap rings.

The end of the piston rod far away from the valve box body is coaxially provided with an insertion hole corresponding to the diameter of the pull rod, the radial peripheral surface of the pull rod close to the end of the valve box body is provided with a plurality of annular grooves, and the plane of each annular groove is perpendicular to the central axis of the pull rod.

A piston end cover through hole is coaxially arranged on the piston rod end cover, the end, close to the valve box body, of the pull rod penetrates through the piston end cover through hole and is inserted into an insertion hole of the piston rod, the two metal inner clamping rings are clamped into a ring groove to form a circular cylinder, and the two elastic outer clamping rings are arranged between the piston rod end cover and the circular cylinder and tightly press the circular cylinder; the end cover of the piston rod is in threaded connection with the end of the piston rod, which is far away from the valve box body.

And a blocking disc perpendicular to the central axis of the piston rod is arranged at the end of the piston rod, which is far away from the valve box body.

The liquid inlet valve comprises a liquid inlet valve annular valve seat, a liquid inlet valve compression spring and a liquid inlet valve body, wherein the liquid inlet valve body can seal the liquid inlet, and the liquid inlet valve annular valve seat is connected with the liquid inlet valve annular valve seat through the liquid inlet valve compression spring.

The liquid outlet valve comprises a liquid outlet valve pressing spring, a liquid outlet valve annular valve seat, a liquid outlet valve body capable of sealing an inner hole of the liquid outlet valve annular valve seat and a pressing spring, the liquid outlet valve annular valve seat is connected with the valve box body through the liquid outlet valve pressing spring, and the liquid outlet is formed at the connecting position of the liquid outlet valve pressing spring and the valve box body; the annular valve seat of the liquid outlet valve is connected with the annular valve seat of the liquid inlet valve through a compression spring.

The cross section of the inner cavity of the valve box body is circular; the central axes of the inner cavity of the valve box body, the annular valve seat of the liquid inlet valve, the pressure spring of the liquid inlet valve, the valve body of the liquid inlet valve, the pressure spring, the annular valve seat of the liquid outlet valve, the pressure spring of the liquid outlet valve, the valve body of the liquid outlet valve, the liquid inlet and the liquid outlet are on the same straight line; the rigidity of the pressing spring is greater than that of the liquid outlet valve pressing spring and greater than that of the liquid inlet valve pressing spring.

The liquid inlet of each valve box component is respectively connected with a liquid inlet pipe; the liquid outlet of each valve box component is connected with the liquid outlet pipe.

As the preferred technical scheme, the outer diameter of the piston end cover is smaller than that of the convex ring; the end of the convex ring close to the piston end cover is provided with a first sealing body clamping device with a concave section, and the opening of the first sealing body clamping device is positioned at the end close to the piston end cover; the cover plate of the piston end cover is not contacted with the end, far away from the pull rod mounting sleeve, of the piston main body.

As the preferred technical scheme, the end of the piston rod, which is far away from the pull rod mounting sleeve, is provided with an annular step, and the end of the piston body, which is far away from the pull rod mounting sleeve, is in contact with the annular step.

As the preferred technical scheme, the pull rod is arranged on the pull rod mounting sleeve through a pull rod sealing assembly; the pull rod sealing assembly comprises two metal top sleeves and a sealing body, the two metal top sleeves are arranged between the pull rod and the pull rod mounting sleeve, the sealing body is arranged between the two metal top sleeves, and a bottom plate is arranged at the end, close to the valve box body, of the pull rod mounting sleeve; the bottom plate is provided with a pull rod through hole, and the pull rod penetrates through the pull rod through hole; the bottom plate and the pull rod mounting sleeve are of an integral structure formed by integral casting;

a closed space is formed between the metal top sleeve close to the inner cavity of the valve box body, the bottom plate and the pull rod; an oil inlet valve is arranged on the bottom plate; the oil inlet valve is connected with the hydraulic pump station through an oil pipe; the metal top sleeve far away from the end of the valve box body is fixed in the pull rod mounting sleeve; the end surfaces of the two metal top sleeves close to the sealing body are planes; the distance between the ends of the two metal top sleeves close to the sealing body and the side close to the pull rod is larger than that between the ends of the two metal top sleeves far away from the pull rod; the sealing body is extruded by the two metal top sleeves through oil pressure, and the sealing body is tightly attached to the radial peripheral surface of the pull rod;

the inner diameter of the metal top sleeve close to the end of the valve box body, which is far away from the end of the sealing body, is larger than the inner diameter of the metal top sleeve close to the end of the first sealing body; and a wear-resistant sealing sleeve is arranged between the end of the metal top sleeve far away from the end of the valve box body far away from the sealing body and the radial outer peripheral surface of the pull rod.

According to a preferred technical scheme, the first sealing body is made of polyurethane; the second sealing body is made of polyurethane.

As the preferred technical scheme, the elastic outer snap ring is made of rubber.

As a preferred technical scheme, the liquid inlet of each valve box component is respectively connected with a main liquid inlet pipe through a liquid inlet pipe, and the liquid outlet of each valve box component is connected with a liquid outlet pipe; two ends of the main liquid inlet pipe are provided with one side liquid inlet valve; the middle liquid inlet valve is connected to the position near each liquid inlet pipe on the main liquid inlet pipe through the middle liquid inlet pipe, and each liquid inlet pipe on the non-two ends of the main liquid inlet pipe and the middle liquid inlet pipe closest to the main liquid inlet pipe form a middle liquid inlet combination; control valves are arranged at two ends of each liquid inlet combination on the main liquid inlet pipe.

As the preferred technical scheme, a plurality of fins used for rotating the piston rod end cover are arranged on the radial outer circumferential surface of the piston rod end cover.

As preferred technical scheme, be equipped with the extrusion ring on the radial periphery surface of piston end cover, first seal is located between extrusion ring and the bulge loop.

As a preferred technical scheme, the diameter of the blocking disc is larger than that of the end cover of the piston rod.

The invention has the beneficial effects that: the annular valve seat of the liquid outlet valve is connected with the annular valve seat of the liquid inlet valve through a compression spring, and the rigidity of the compression spring is greater than that of the compression spring of the liquid outlet valve and greater than that of the compression spring of the liquid inlet valve; when the flow is uneven and the pressure is unstable, the positions of the annular valve seat of the liquid inlet valve and the annular valve seat of the liquid outlet valve are elastically adjusted to achieve the effect of stabilizing the pump pressure, so that the use safety of components in the pump is well protected, and the service life of the slurry pump is prolonged. The exchange of single liquid, double liquid and multiple liquid is realized through the opening and closing of each control valve on the main liquid inlet pipe by the mud pump; the plunger end cover is rotated, the metal inner snap rings in the two half circular ring cylinder shapes and the elastic outer snap rings in the two half circular ring cylinder shapes can be quickly taken down to realize disassembly, and when the two metal inner snap rings are positioned in different annular grooves, the distance between the pull rod mounting sleeve far away from the plunger and the inner cavity of the valve box body can be finely adjusted, so that the liquid pumping amount of the liquid pumping system can be adjusted. Through the plunger horizontal position fine adjustment assembly, the mixing of different proportions of the liquid can be realized under the condition of not adjusting the liquid components of each liquid inlet pipe; the interchangeability of liquid mixing is facilitated.

When the contact pressure between the first sealing body and the wear-resistant layer of the metal sleeve needs to be adjusted, the piston is rotated to install the sleeve end cover, and the piston rod is dismounted; because the radial peripheral surface that the telescopic being close to pull rod installation cover end of metal is equipped with the boss, through sled the boss, can take out metal sleeve in the pull rod installation cover fast, realize the change to metal sleeve.

Because the piston end cover is in threaded connection with the end, far away from the pull rod, of the piston main body, the first sealing body is extruded by rotating the piston end cover, and the first sealing body is tightly attached to the radial inner peripheral surface of the metal sleeve.

The stop disc is arranged, so that liquid on the piston rod can be effectively prevented from entering the pull rod mounting sleeve of the power end, and the surface of an internal part at the power end is effectively prevented from being easily corroded and abraded;

the adjusting and connecting assembly comprises two connecting half sleeves, and the connecting rod and the pull rod are quickly connected through quick disassembly of the two connecting half sleeves; the first connector and the second connector are hemispherical, and by adopting the structure, the coaxiality of the connecting rod and the pull rod can be well adjusted, so that the abrasion of the pull rod to the pull rod sealing assembly and the abrasion of the piston to the piston sealing assembly by the piston are reduced.

Drawings

FIG. 1 is a schematic diagram of the construction of the mud pump of the present invention.

Fig. 2 is a partially enlarged view of a portion a of fig. 1.

Fig. 3 is a partially enlarged view of a portion B of fig. 1.

FIG. 4 is a cross-sectional view of the mud pump of FIG. 1 taken along line C-C'.

Fig. 5 is a partially enlarged view of a portion D of fig. 4.

Fig. 6 is a partially enlarged view of a portion H of fig. 5.

Fig. 7 is a partially enlarged view of a portion I of fig. 5.

Fig. 8 is a partially enlarged view of a portion E of fig. 4.

Fig. 9 is a partially enlarged view of a portion F of fig. 4.

Fig. 10 is a partially enlarged view of a portion G of fig. 4.

FIG. 11 is a state diagram of the mud pump of FIG. 1.

Fig. 12 is a partially enlarged view of a portion J of fig. 11.

Fig. 13 is a partially enlarged view of a portion K of fig. 11.

Fig. 14 is a partially enlarged view of a portion L of fig. 11.

Wherein: a hydraulic end-1; a valve box body-11; a liquid inlet-12; a liquid outlet-13; an inner cavity-14 of the valve box body; a piston mounting sleeve-15; a liquid inlet valve-16; a liquid outlet valve-17; liquid inlet valve ring valve seat-161; the liquid inlet valve compresses the spring-162; a liquid inlet valve body-163; the liquid outlet valve compresses a spring-171; a liquid outlet valve body-172; a hold-down spring-173; an annular valve seat-174 of the liquid outlet valve;

a power end-2; a pull rod mounting sleeve-21; a bottom plate-22;

a piston rod-3; an insertion hole-31; a piston-32; the piston is mounted on the end cover-33; a steel jacket-34; a boss-35; -36, a wear layer; piston end cap-37; a first seal-38; a piston body-39; a convex ring-310; a first seal body clamping device-311; an annular step-312; extrusion ring-313;

a pull rod-4; ring groove-41;

a fin-5;

a blocking disk-61;

a metal top sleeve-71; a second seal-72; -73 closed space; an oil inlet valve-74; oil pipe-75; a wear-resistant sealing sleeve-76;

a piston horizontal position fine adjustment component-8; a piston rod end cover-81; a metal inner snap ring-82; elastic outer snap ring-83;

a liquid inlet pipe-91; a total liquid inlet pipe-92; a liquid outlet pipe-93; side liquid inlet valve-94; flow control valve-95; medium liquid inlet pipe-96; medium liquid inlet valve-97;

a total liquid inlet pipe-92; two ends of the valve are provided with a side liquid inlet valve-94; (ii) a A total liquid inlet pipe-92; feeding liquid inlet pipes-91; the liquid inlet pipe-91 is positioned in the middle; a liquid inlet pipe-91 arranged at both sides of the tube; flow control valves-95 are respectively arranged between the two valves; (ii) a A total liquid inlet pipe-92; the upper two flow control valves-95; the middle liquid inlet pipe-96 is arranged between the upper and lower liquid inlet pipes; is connected with a middle liquid inlet valve-97.

Detailed Description

The invention is further illustrated by the following figures and examples.

Example 1. 1-14, an oil pressure sealed piston mud pump for facilitating mixing of fluids includes a fluid end 1, a power end 2.

A plurality of liquid pumping systems are arranged between the liquid end 1 and the power end 2.

Each liquid pumping system comprises a valve box assembly, a pull rod mounting sleeve 21 and a transmission assembly; each valve box component is arranged on the hydraulic end 1, and each pull rod mounting sleeve 21 is arranged on the power end 2; the transmission assembly comprises a pull rod 4, a pull rod sealing assembly, a piston rod 3, a piston 32 and a piston horizontal position fine adjustment assembly 8.

The valve box assembly comprises a valve box body 11, a liquid inlet 12 and a liquid outlet 13 which are arranged on the side wall of the valve box body 11, a valve box body inner cavity 14 arranged in the valve box body 11, and a piston mounting sleeve 15 which is arranged on the side wall of the valve box body 11 close to the pull rod mounting sleeve 21 and communicated with the valve box body inner cavity 14; the central axis of the piston plug mounting sleeve 15 is arranged transversely.

The end of each piston rod 3 far away from the pull rod mounting sleeve is positioned in the piston mounting sleeve 15, and the piston 32 is arranged at the end of the piston rod 3 far away from the pull rod mounting sleeve; be equipped with feed liquor valve 16, play liquid valve 17 in the valve box 11, feed liquor valve 16 links to each other with inlet 12, goes out liquid valve 17 and links to each other its characterized in that with liquid outlet 13:

the pull rod 4 is connected with the piston rod 3 through a piston horizontal position fine adjustment component 8; the pull rod 4 is arranged on the pull rod installation sleeve 21 through a pull rod sealing device.

A piston mounting sleeve end cover 33 is arranged at the end of the piston mounting sleeve 15 close to the pull rod mounting sleeve 21 in a threaded manner; a piston rod through hole is formed in the piston mounting sleeve end cover 33, and the piston rod 3 penetrates through the piston rod through hole; a steel sleeve 34 is sleeved in the piston mounting sleeve 15; the end of the steel sleeve 34 far away from the pull rod mounting sleeve 21 is in contact with the valve box body 11; a boss 35 is arranged on the radial peripheral surface of the steel sleeve 34 close to the end of the pull rod mounting sleeve 21; the end of the boss 35 close to the valve box body 11 is not contacted with the end of the piston mounting sleeve 15 far away from the valve box body 11; the radially inner peripheral surface of the steel sleeve 34 is provided with a wear-resistant layer 36; the end of the steel sleeve 34 close to the pull rod mounting sleeve 21 extends out of the piston mounting sleeve 15 and is in contact with the piston mounting sleeve end cover 33; the steel sleeve 34 is secured within the piston mounting sleeve 15 by rotating the piston mounting sleeve end cap 33.

The piston 32 comprises a piston end cover 37 arranged at the end of the piston rod 3 far away from the pull rod mounting sleeve 21, a first sealing body 38 and a piston main body 39, a convex ring 310 is arranged on the radial outer peripheral surface of the piston main body 39, and the first sealing body 38 is positioned between the piston end cover 37 and the convex ring 310; the piston end cover 37 is screwed with the end of the piston main body 39 far from the pull rod mounting sleeve 21, and the first sealing body 38 is pressed and tightly attached to the radial inner peripheral surface of the steel sleeve 34 by rotating the piston end cover 37.

The pull rod 4 is connected to the pull rod mounting sleeve 21; the central axes of the pull rod 4 and the piston rod 3 are on the same straight line;

the piston horizontal position fine adjustment assembly 8 comprises a piston rod end cover 81, two semi-circular cylindrical metal inner snap rings 82 and two semi-circular cylindrical elastic outer snap rings 83.

The end of the piston rod 3, which is far away from the valve box body 11, is coaxially provided with an insertion hole 31 with the diameter corresponding to that of the pull rod 4, the radial peripheral surface of the end of the pull rod 4, which is close to the valve box body 11, is provided with a plurality of ring grooves 41, and the plane of each ring groove 41 is perpendicular to the central axis of the pull rod 4.

A piston end cover through hole is coaxially arranged on the piston rod end cover 81, the end of the pull rod 4 close to the valve box body 11 penetrates through the piston end cover through hole and is inserted into the insertion hole 31 of the piston rod 3, the two metal inner snap rings 82 are clamped into the annular groove 41 to form an annular cylinder, and the two elastic outer snap rings 83 are arranged between the piston rod end cover 81 and the annular cylinder and tightly press the annular cylinder; the piston rod end cover 81 is screwed on the end of the piston rod 3 far away from the valve box body 11.

A stop disc 61 perpendicular to the central axis of the piston rod 3 is arranged on the end of the piston rod 3 far away from the valve box body 11.

The liquid inlet valve 16 comprises a liquid inlet valve annular valve seat 161, a liquid inlet valve hold-down spring 162 and a liquid inlet valve body 163, wherein the liquid inlet valve body 163 can seal the liquid inlet 12, and the liquid inlet valve annular valve seat 161 is connected with the liquid inlet valve annular valve seat 161 through the liquid inlet valve hold-down spring 162.

The liquid outlet valve 17 comprises a liquid outlet valve compression spring 171, a liquid outlet valve annular valve seat 174, a liquid outlet valve body 172 capable of sealing an inner hole of the liquid outlet valve annular valve seat 174, and a compression spring 173, wherein the liquid outlet valve annular valve seat 174 is connected with the valve box body 11 through the liquid outlet valve compression spring 171, and the liquid outlet 13 is arranged at the connection position of the liquid outlet valve compression spring 171 and the valve box body 11; outlet valve annular valve seat 174 is connected to inlet valve annular valve seat 161 by compression spring 173.

The cross section of the valve box inner cavity 14 is circular; the central axes of the inner cavity 14 of the valve box body, the annular valve seat 161 of the liquid inlet valve, the pressure spring 162 of the liquid inlet valve, the valve body 163 of the liquid inlet valve, the pressure spring 173, the annular valve seat 174 of the liquid outlet valve, the pressure spring 171 of the liquid outlet valve, the valve body 172 of the liquid outlet valve, the liquid inlet 12 and the liquid outlet 13 are on the same straight line; the stiffness of the hold-down spring 173 is greater than the stiffness of the outlet valve hold-down spring 171 and greater than the stiffness of the inlet valve hold-down spring 162.

The first sealing body is made of polyurethane; the second sealing body is made of polyurethane.

The elastic outer snap ring is made of rubber.

The liquid inlet 12 of each valve box component is respectively connected with a liquid inlet pipe 91; the outlet port 13 of each valve box assembly is connected to an outlet pipe 93.

The outer diameter of the piston end cover 37 is smaller than that of the convex ring 310; the end of the convex ring 310 close to the piston end cover 37 is provided with a first sealing body clamping device 311 with a concave section, and the opening of the first sealing body clamping device 311 is positioned at the end close to the piston end cover 37; the cover plate of the piston end cover 37 is not in contact with the end of the piston main body 39 far away from the pull rod mounting sleeve 21.

The end of the piston rod 3 away from the pull rod mounting sleeve 21 is provided with an annular step 312, and the end of the piston main body 39 away from the pull rod mounting sleeve 21 is in contact with the annular step 312.

The pull rod 4 is arranged on the pull rod mounting sleeve 21 through a pull rod sealing component; the pull rod sealing assembly comprises two metal top sleeves 71 and a second sealing body 72 which are arranged between the pull rod 4 and the pull rod mounting sleeve 21, the second sealing body 72 is arranged between the two metal top sleeves 71, and a bottom plate 22 is arranged at the end, close to the valve box body 11, of the pull rod mounting sleeve 21; a pull rod through hole is formed in the bottom plate 22, and the pull rod 4 penetrates through the pull rod through hole; the bottom plate 22 and the pull rod mounting sleeve 21 are integrally cast into a whole structure.

A closed space 73 is formed between the metal top sleeve 71 close to the inner cavity of the valve box body, the bottom plate 22 and the pull rod 4; an oil inlet valve 74 is arranged on the bottom plate 22; the oil inlet valve 74 is connected with the hydraulic pump station through an oil pipe 75; the metal top sleeve 71 far away from the end of the valve box body 11 is fixed in the pull rod mounting sleeve 21; the end surfaces of the two metal top sleeves 71 close to the second sealing body 72 are planes; the distance between the two metal top sleeves 71 and the side close to the pull rod, which is close to the end of the second sealing body 72, is larger than the distance between the two metal top sleeves and the side far away from the pull rod; the two metal top sleeves 71 press the second sealing body 72 by oil pressure and make the second sealing body 72 closely contact with the radial outer peripheral surface of the pull rod 4.

The inner diameter of the metal top sleeve 71 close to the end of the valve box body far away from the second sealing body 72 is larger than that of the metal top sleeve close to the end of the first sealing body; and a wear-resistant sealing sleeve 76 is arranged between the end, far away from the second sealing body 72, of the metal top sleeve 71 far away from the end of the valve box body and the radial outer peripheral surface of the pull rod.

The liquid inlet 12 of each valve box assembly is connected with a total liquid inlet pipe 92 through a liquid inlet pipe 91, and the liquid outlet 13 of each valve box assembly is connected with a liquid outlet pipe 93; two ends of the total liquid inlet pipe 92 are provided with a side liquid inlet valve 94; the vicinity of each liquid inlet pipe 91 on the total liquid inlet pipe 92 is connected with a middle liquid inlet valve 97 through a middle liquid inlet pipe 96, and each liquid inlet pipe 91 on the non-two ends of the total liquid inlet pipe 92 and the middle liquid inlet pipe 96 nearest to the liquid inlet pipe form a middle liquid inlet combination; control valves 95 are provided at both ends of each liquid inlet combination on the total liquid inlet pipe 92.

The piston rod end cover 81 is provided on the radially outer peripheral surface thereof with a plurality of fins 5 for rotating the piston rod end cover 81.

A pressing ring 313 is provided on a radially outer peripheral surface of the piston end cover 37, and the first sealing body 38 is located between the pressing ring 313 and the convex ring 310.

The diameter of the blocking disk 61 is larger than the diameter of the piston rod end cap 81.

The liquid outlet valve annular valve seat 174 is connected with the liquid inlet valve annular valve seat 161 through a compression spring 173, and the rigidity of the compression spring 173 is greater than that of the liquid outlet valve compression spring 171 and greater than that of the liquid inlet valve compression spring 162; when the flow is uneven and the pressure is unstable, the positions of the annular valve seat 161 of the liquid inlet valve and the annular valve seat 174 of the liquid outlet valve are elastically adjusted to achieve the effect of stabilizing the pumping pressure, so that the use safety of components in the pump is well protected, and the service life of the slurry pump is prolonged. The exchange of single liquid, double liquid and multiple liquid is realized by the slurry pump through the opening and closing of each control valve 95 on the total liquid inlet pipe 92; the plunger end cover 81 is rotated, the two semi-circular cylindrical metal inner snap rings 82 and the two semi-circular cylindrical elastic outer snap rings 83 can be quickly taken down to realize disassembly, and when the two semi-circular cylindrical metal inner snap rings 82 are positioned in different annular grooves 41, the distance between the plunger 3 far away from the pull rod mounting sleeve 21 and the valve box inner cavity 14 can be finely adjusted, so that the liquid pumping amount of the liquid pumping system can be adjusted. Through the plunger horizontal position fine adjustment assembly, the mixing of different proportions of the liquid can be realized under the condition of not adjusting the liquid components of each liquid inlet pipe 91; the interchangeability of liquid mixing is facilitated.

When the contact pressure between the first sealing body 38 and the wear-resistant layer 36 of the steel sleeve 34 needs to be adjusted, the piston mounting sleeve end cover 33 is rotated, and the piston rod 3 is dismounted; because the radial peripheral surface of the steel sleeve 34 close to the end of the pull rod mounting sleeve 21 is provided with the boss 35, the steel sleeve 34 can be quickly taken out of the pull rod mounting sleeve 21 by prying the boss 35, and the steel sleeve 34 is replaced.

Since the piston end cap 37 is screwed to the end of the piston main body 39 remote from the tie rod mounting sleeve 21, the first sealing body 38 is pressed by rotating the piston end cap 37 and the first sealing body 38 is tightly fitted to the radially inner peripheral surface of the steel sleeve 34.

The stop disc 61 is arranged, so that liquid on the piston rod 3 can be effectively prevented from entering the pull rod mounting sleeve 21 of the power end 2, and the surface of a part in the power end 2 is effectively prevented from being easily corroded and abraded;

The above-mentioned embodiments are only for understanding the present invention, and are not intended to limit the technical solutions of the present invention, and those skilled in the art can make various changes or modifications based on the technical solutions described in the claims, and all equivalent changes or modifications should be covered by the scope of the claims of the present invention. The present invention is not described in detail, but is known to those skilled in the art.

Claims

1. An oil pressure sealing piston mud pump convenient for liquid mixing comprises a liquid end (1) and a power end (2);

a plurality of liquid pumping systems are arranged between the liquid end (1) and the power end (2);

each liquid pumping system comprises a valve box component, a pull rod mounting sleeve (21) and a transmission component; each valve box component is arranged on the hydraulic end (1), and each pull rod mounting sleeve (21) is arranged on the power end (2); the transmission assembly comprises a pull rod (4), a pull rod sealing assembly, a piston rod (3), a piston (32) and a piston horizontal position fine adjustment assembly (8);

the valve box assembly comprises a valve box body (11), a liquid inlet (12) and a liquid outlet (13) which are arranged on the side wall of the valve box body (11), a valve box body inner cavity (14) which is arranged in the valve box body (11), and a piston mounting sleeve (15) which is arranged on the side wall of the valve box body (11) close to the pull rod mounting sleeve (21) and is communicated with the valve box body inner cavity (14); the central axis of the piston plug mounting sleeve (15) is transversely arranged;

the end of each piston rod (3) far away from the pull rod mounting sleeve is positioned in the piston mounting sleeve (15), and the piston (32) is mounted at the end of the piston rod (3) far away from the pull rod mounting sleeve; be equipped with feed liquor valve (16), play liquid valve (17) in valve box (11), feed liquor valve (16) link to each other with inlet (12), go out liquid valve (17) and link to each other its characterized in that with liquid outlet (13):

the pull rod (4) is connected with the piston rod (3) through a piston horizontal position fine adjustment assembly (8); the pull rod (4) is arranged on the pull rod mounting sleeve (21) through a pull rod sealing device;

a piston mounting sleeve end cover (33) is arranged at the end of the piston mounting sleeve (15) close to the pull rod mounting sleeve (21) in a threaded manner; a piston rod through hole is formed in the piston mounting sleeve end cover (33), and the piston rod (3) penetrates through the piston rod through hole; a steel sleeve (34) is sleeved in the piston mounting sleeve (15); the end of the steel sleeve (34) far away from the pull rod mounting sleeve (21) is contacted with the valve box body (11); a boss (35) is arranged on the radial peripheral surface of the end, close to the pull rod mounting sleeve (21), of the steel sleeve (34); the end of the boss (35) close to the valve box body (11) is not contacted with the end of the piston mounting sleeve (15) far away from the valve box body (11); the radial inner peripheral surface of the steel sleeve (34) is provided with a wear-resistant layer (36); the end of the steel sleeve (34) close to the pull rod mounting sleeve (21) extends out of the piston mounting sleeve (15) and is contacted with the piston mounting sleeve end cover (33); the steel sleeve (34) is fixed in the piston mounting sleeve (15) by rotating the piston mounting sleeve end cover (33);

the piston (32) comprises a piston end cover (37) arranged at the end, far away from the pull rod mounting sleeve (21), of the piston rod (3), a first sealing body (38) and a piston main body (39), a convex ring (310) is arranged on the radial outer peripheral surface of the piston main body (39), and the first sealing body (38) is located between the piston end cover (37) and the convex ring (310); the piston end cover (37) is in threaded connection with the end, far away from the pull rod mounting sleeve (21), of the piston main body (39), the first sealing body (38) is extruded by rotating the piston end cover (37), and the first sealing body (38) is tightly attached to the radial inner peripheral surface of the steel sleeve (34);

the pull rod (4) is connected to the pull rod mounting sleeve (21); the central axes of the pull rod (4) and the piston rod (3) are on the same straight line;

the piston horizontal position fine adjustment assembly (8) comprises a piston rod end cover (81), a metal inner clamping ring (82) in the shape of a two-half circular ring cylinder and an elastic outer clamping ring (83) in the shape of a two-half circular ring cylinder;

an insertion hole (31) which is adaptive to the diameter of the pull rod (4) is coaxially formed in the end, far away from the valve box body (11), of the piston rod (3), a plurality of annular grooves (41) are formed in the radial peripheral surface of the pull rod (4) which is close to the end, close to the valve box body (11), of the valve box body, and the plane where each annular groove (41) is located is perpendicular to the central axis of the pull rod (4);

a piston end cover through hole is coaxially arranged on the piston rod end cover (81), the end, close to the valve box body (11), of the pull rod (4) penetrates through the piston end cover through hole and is inserted into the insertion hole (31) of the piston rod (3), the two metal inner snap rings (82) are clamped into the annular groove (41) to form an annular cylinder, and the two elastic outer snap rings (83) are arranged between the piston rod end cover (81) and the annular cylinder and tightly press the annular cylinder; the end cover (81) of the piston rod is in threaded connection with the end, far away from the valve box body (11), of the piston rod (3);

a stop disc (61) perpendicular to the central axis of the piston rod (3) is arranged at the end of the piston rod (3) far away from the valve box body (11);

the liquid inlet valve (16) comprises a liquid inlet valve annular valve seat (161), a liquid inlet valve pressing spring (162) and a liquid inlet valve body (163), the liquid inlet valve body (163) can seal the liquid inlet (12), and the liquid inlet valve annular valve seat (161) is connected with the liquid inlet valve annular valve seat (161) through the liquid inlet valve pressing spring (162);

the liquid outlet valve (17) comprises a liquid outlet valve compression spring (171), a liquid outlet valve annular valve seat (174), a liquid outlet valve body (172) capable of sealing an inner hole of the liquid outlet valve annular valve seat (174), and a compression spring (173), the liquid outlet valve annular valve seat (174) is connected with the valve box body (11) through the liquid outlet valve compression spring (171), and a liquid outlet (13) is formed at the connection position of the liquid outlet valve compression spring (171) and the valve box body (11); the liquid outlet valve annular valve seat (174) is connected with the liquid inlet valve annular valve seat (161) through a compression spring (173);

the cross section of the inner cavity (14) of the valve box body is circular; the central axes of the valve box inner cavity (14), the liquid inlet valve annular valve seat (161), the liquid inlet valve hold-down spring (162), the liquid inlet valve body (163), the hold-down spring (173), the liquid outlet valve annular valve seat (174), the liquid outlet valve hold-down spring (171), the liquid outlet valve body (172), the liquid inlet (12) and the liquid outlet (13) are on the same straight line; the rigidity of the pressing spring (173) is greater than that of the liquid outlet valve pressing spring (171) and greater than that of the liquid inlet valve pressing spring (162);

the liquid inlet (12) of each valve box component is respectively connected with a liquid inlet pipe (91); the liquid outlet (13) of each valve box component is connected with a liquid outlet pipe (93).

2. The mud pump as set forth in claim 1, wherein said piston pump further comprises: the outer diameter of the piston end cover (37) is smaller than that of the convex ring (310); a first sealing body clamping device (311) with a concave section is arranged at the end, close to the piston end cover (37), of the convex ring (310), and the opening of the first sealing body clamping device (311) is positioned at the end, close to the piston end cover (37), of the first sealing body clamping device; the cover plate of the piston end cover (37) is not contacted with the end of the piston main body (39) far away from the pull rod mounting sleeve (21).

3. The mud pump as set forth in claim 2, wherein said piston pump further comprises: an annular step (312) is arranged at the end of the piston rod (3) far away from the pull rod mounting sleeve (21), and the end of the piston main body (39) far away from the pull rod mounting sleeve (21) is in contact with the annular step (312).

4. The mud pump as set forth in claim 1, wherein said piston pump further comprises: the pull rod (4) is arranged on the pull rod mounting sleeve (21) through a pull rod sealing component; the pull rod sealing assembly comprises two metal top sleeves (71) and a second sealing body (72), the two metal top sleeves (71) are arranged between the pull rod (4) and the pull rod installation sleeve (21), the second sealing body (72) is arranged between the two metal top sleeves (71), and a bottom plate (22) is arranged at the end, close to the valve box body (11), of the pull rod installation sleeve (21); a pull rod through hole is arranged on the bottom plate (22), and the pull rod (4) penetrates through the pull rod through hole; the bottom plate (22) and the pull rod mounting sleeve (21) are integrally cast into an integral structure;

a closed space (73) is formed among the metal top sleeve (71) close to the inner cavity of the valve box body, the bottom plate (22) and the pull rod (4); an oil inlet valve (74) is arranged on the bottom plate (22); the oil inlet valve (74) is connected with the hydraulic pump station through an oil pipe (75); a metal top sleeve (71) far away from the end of the valve box body (11) is fixed in the pull rod mounting sleeve (21); the end surfaces of the two metal top sleeves (71) close to the second sealing body (72) are planes; the distance between the ends of the two metal top sleeves (71) close to the second sealing body (72) and close to the pull rod is larger than that between the ends of the two metal top sleeves and far away from the pull rod; the two metal top sleeves (71) extrude the second sealing body (72) through oil pressure, and the second sealing body (72) is tightly attached to the radial outer peripheral surface of the pull rod (4);

the inner diameter of the end, far away from the second sealing body (72), of the metal top sleeve (71) close to the end of the valve box body is larger than the inner diameter of the end, close to the first sealing body, of the metal top sleeve; and a wear-resistant sealing sleeve (76) is arranged between the end, far away from the second sealing body (72), of the metal top sleeve (71) far away from the end of the valve box body and the radial outer peripheral surface of the pull rod.

5. The mud pump as set forth in claim 4, wherein said piston pump further comprises: the first sealing body is made of polyurethane; the second sealing body is made of polyurethane.

6. The mud pump as set forth in claim 4, wherein said piston pump further comprises: the elastic outer snap ring is made of rubber.

7. The mud pump as set forth in claim 1, wherein said piston pump further comprises: the liquid inlet (12) of each valve box component is connected with a total liquid inlet pipe (92) through a liquid inlet pipe (91), and the liquid outlet (13) of each valve box component is connected with a liquid outlet pipe (93); two ends of the main liquid inlet pipe (92) are provided with a side liquid inlet valve (94); the vicinity of each liquid inlet pipe (91) on the total liquid inlet pipe (92) is connected with a middle liquid inlet valve (97) through a middle liquid inlet pipe (96), and each liquid inlet pipe (91) on the non-two ends of the total liquid inlet pipe (92) and the middle liquid inlet pipe (96) nearest to the total liquid inlet pipe form a middle liquid inlet combination; control valves (95) are arranged at two ends of each liquid inlet combination on the total liquid inlet pipe (92).

8. The mud pump as set forth in claim 1, wherein said piston pump further comprises: the radial outer peripheral surface of the piston rod end cover (81) is provided with a plurality of fins (5) for rotating the piston rod end cover (81).

9. The mud pump as set forth in claim 1, wherein said piston pump further comprises: a squeezing ring (313) is arranged on the radial outer peripheral surface of the piston end cover (37), and the first sealing body (38) is located between the squeezing ring (313) and the convex ring (310).

10. The mud pump as set forth in claim 1, wherein said piston pump further comprises: the diameter of the stop disc (61) is larger than that of the piston rod end cover (81).