CN112832970A

CN112832970A - Double-hydraulic sealing mud pump

Info

Publication number: CN112832970A
Application number: CN202110149392.8A
Authority: CN
Inventors: 李鲁杰; 邵鹏飞; 李刚
Original assignee: SHANDONG ZHONGTAN MACHINERY CO Ltd
Current assignee: SHANDONG ZHONGTAN MACHINERY CO Ltd
Priority date: 2021-02-03
Filing date: 2021-02-03
Publication date: 2021-05-25

Abstract

The invention discloses a double hydraulic sealing slurry pump which comprises a hydraulic end and a power end, wherein a plurality of liquid pumping systems are arranged between the hydraulic end and the power end, and each liquid pumping system comprises a valve box body and a plunger; the right left side of each valve box body on the power end is provided with a left plunger mounting hole, and the right side surface of each left plunger mounting hole is coaxially provided with a left plunger mounting sleeve; a plunger right mounting hole is formed in the left side face of each valve box body, and a plunger right mounting sleeve is coaxially mounted on the plunger right mounting hole; the second circular cylindrical water through gap in the left plunger mounting sleeve and the first circular cylindrical water through gap in the right plunger mounting sleeve are respectively connected with a constant-pressure water injection pump; the plunger penetrates through the left plunger mounting hole and the right plunger mounting hole. The slurry pump has the advantages that the liquid inlet amount is ensured, and the problem of sealing failure caused by the fact that large-diameter slurry particles enter a sealing system and a plunger frequently moves can be effectively solved.

Description

Double-hydraulic sealing mud pump

Technical Field

The invention relates to the technical field of slurry pumps, in particular to a double-hydraulic-pressure sealing slurry pump.

Background

The slurry 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 the oil field, can complete water plugging and oil displacement operation to an oil well, can also be used for cementing plug, 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.

The plunger of the existing slurry pump is made of metal materials, and because the plunger needs to move repeatedly and bear certain high pressure, the requirement of the plunger on the processing precision is high, and particularly when the medium contains sand with larger grain diameter, the plunger reciprocates, the sealing difficulty is high, and the manufacturing cost is high. The plunger, the liquid inlet valve, the liquid outlet valve and the like of the slurry pump work under the working conditions of high temperature, high pressure and high speed, the liquid inlet and the liquid outlet quantity are insufficient due to uneven pressure in the pump, the service life of related devices is short, the devices are required to be replaced regularly, and potential safety hazards are caused due to damage of parts caused by lubricating oil leakage or uneven pressure in a cylinder body.

Disclosure of Invention

The invention aims to provide a double hydraulic sealing mud pump, which aims to solve the problems of potential safety hazards caused by insufficient liquid inlet and liquid outlet quantity due to damage of parts caused by leakage of lubricating oil or uneven pressure in a cylinder body if the mud pump leaks.

In order to achieve the above object, the present invention provides the following technical solutions.

A double hydraulic pressure sealing mud pump comprises a hydraulic end and a power end, wherein a plurality of liquid pumping systems are arranged between the hydraulic end and the power end.

Each liquid pumping system comprises a valve box body and a plunger; the lower end of each valve box body is provided with a liquid inlet, the upper end of each valve box body is provided with a liquid outlet, and the valve box body is internally provided with a valve box body inner cavity; each valve box body is arranged on the hydraulic end; the upper end of the inner cavity of the valve box body of the valve box is provided with a liquid outlet valve, and the lower end of the inner cavity of the valve box body of the valve box is provided with a liquid inlet valve; the cross section of the inner cavity of the valve box body of the valve box is circular.

The right left side of each valve box body on the power end is provided with a left plunger mounting hole, and the right side surface of each left plunger mounting hole is coaxially provided with a left plunger mounting sleeve; a plunger right mounting hole is formed in the left side face of each valve box body, and a plunger right mounting sleeve is coaxially mounted on the plunger right mounting hole; the plunger penetrates through the left plunger mounting hole, the left plunger mounting sleeve, the right plunger mounting hole and the right plunger mounting sleeve.

The length of the plunger is greater than the distance between the right side surface of the right plunger mounting sleeve and the left side surface of the left plunger mounting sleeve, and the left end of the plunger is connected with a transmission device of a slurry pump; the right end of the plunger is located in the middle of the inner cavity of the valve box body.

A right ring platform is installed on the left side surface of the valve box body, threads are arranged on the radial outer peripheral surface of the right ring platform, and the right end of a right plunger installation sleeve is sleeved on the right ring platform; a plunger right mounting sleeve convex ring is arranged on the radial inner peripheral surface of the front end of the plunger right mounting sleeve, and the radial inner peripheral surface of the plunger right mounting sleeve convex ring is in contact with the plunger; the radial inner peripheral surfaces of the right mounting sleeve convex ring and the right annular table of the plunger are in contact with the plunger; a plunger hydraulic end left sealing sleeve, a plunger hydraulic end left sleeve ring, a plunger hydraulic end right sleeve ring and a plunger hydraulic end right sealing sleeve are arranged in a closed space formed among the plunger right mounting sleeve convex ring, the plunger and the right ring platform from right to left, a first circular cylindrical water through gap for water injection is arranged between the plunger hydraulic end left sleeve ring and the plunger hydraulic end right sleeve ring, and the first circular cylindrical water through gap is connected with a constant-pressure water injection pump through a first water injection pipe penetrating through the plunger right mounting sleeve; the first water injection pipe is provided with a first flow rate over-value alarm, and when the flow rate of the first water injection pipe exceeds a set value, the first flow rate over-value alarm gives an alarm; the central axis of the first water injection pipe is perpendicular to the central axis of the right plunger mounting sleeve; the first separating ring is arranged on the first circular ring cylindrical water passing gap.

The liquid inlet valve comprises a liquid inlet valve seat with a circular cross section, and the aperture of the bottom end of the liquid inlet valve seat is smaller than the apertures of the rest parts of the liquid inlet valve seat; the inner hole of the liquid inlet valve seat is internally provided with a liquid inlet valve cover with an upward opening and a U-shaped section vertical to the ground; the top end of the liquid inlet valve seat is connected with a liquid inlet valve cover through a screw; the liquid inlet valve cover comprises a liquid inlet valve cover top plate and a liquid inlet valve cover boss, wherein the liquid inlet valve cover top plate can seal the top of an inner hole of the liquid inlet valve seat; the boss of the valve cover of the liquid inlet valve is connected with the valve cover of the liquid inlet valve through a liquid inlet valve spring which is vertically arranged; the top end of the liquid inlet valve cover is connected with an adjusting and protecting pad ring, the boss of the liquid inlet valve cover penetrates through the adjusting and protecting pad ring, and the top end of the adjusting and protecting pad ring is not contacted with the top plate of the liquid inlet valve cover; a plurality of liquid inlet valve cover through holes are vertically formed in a liquid inlet valve cover top plate, and liquid inlet valve seat through holes which are communicated with the liquid inlet valve cover through holes and are vertically formed are formed right below the liquid inlet valve seat (61) through holes; an annular liquid inlet groove of the liquid inlet valve is arranged on an inner hole at the bottom end of the liquid inlet valve seat and is connected with the through holes of the liquid inlet valve seats; the bottom end of the liquid inlet valve cover is in contact with the annular liquid inlet groove of the liquid inlet valve and can seal the annular liquid inlet groove of the liquid inlet valve.

The liquid outlet valve comprises a liquid outlet valve seat in the shape of a circular ring cylinder and a liquid outlet valve cover with a downward opening, and the diameter of the top end of the liquid outlet valve seat is smaller than that of the inner cavity of the valve box body of the valve box; the radial inner peripheral surface of the bottom end of the liquid outlet valve cover is in threaded connection with the radial outer peripheral surface of the top end of the liquid outlet valve seat; the top end of the liquid outlet valve seat is provided with a liquid outlet valve steel ball which can seal the radial inner peripheral surface of the top end of the liquid outlet valve seat, and the liquid outlet valve steel ball is positioned in the liquid outlet valve cover; a liquid outlet hole of the liquid outlet valve is arranged on the liquid outlet valve cover; a liquid outlet valve elastic cushion is arranged right above the liquid outlet valve steel ball on the liquid outlet valve cover.

The radial inner peripheral surface of the right end of the left plunger mounting sleeve is in threaded connection with a left plunger mounting sleeve compression nut, and the radial inner peripheral surface of the left plunger mounting sleeve compression nut is in contact with the plunger.

A mud scraping ring, a bottom ring, a first sealing ring, a spacer ring, a second sealing ring, a first metal lantern ring and a second metal lantern ring are sequentially arranged between the plunger left mounting sleeve inner plunger left mounting sleeve gland nut and the power end from inside left to right, and a second circular cylindrical water-through gap is arranged between the first metal lantern ring and the second metal lantern ring; a second separating ring is arranged on the second circular ring cylindrical water-passing gap.

The second circular cylindrical water through gap is connected with the constant-pressure water injection pump through a second water injection pipe penetrating through the left plunger mounting sleeve; a second flow rate over-value alarm is arranged on the second water injection pipe, and the second flow rate over-value alarm gives an alarm when the flow rate of the second water injection pipe exceeds a set value; the central axis of the second water injection pipe is perpendicular to the central axis of the left plunger installation sleeve; the distance between the left end and the right end of the radial inner peripheral surface of the bottom ring and the distance ring is smaller than the distance between the left end and the right end of the radial outer peripheral surface of the bottom ring and the distance ring; the bottom ring and the spacer ring are both made of metal; the distance between the left end and the right end of the radial inner peripheral surface of the first sealing ring and the radial inner peripheral surface of the second sealing ring is larger than the distance between the left end and the right end of the radial outer peripheral surface of the first sealing ring and the radial outer peripheral surface of the second sealing ring.

The middle part cover of plunger is equipped with the manger plate, and the diameter of manger plate is greater than the diameter of plunger right side installation cover.

The plunger comprises a plunger wear-resistant outer sleeve and a plunger inner core which are in a circular cylinder shape, and the plunger inner core is installed on an inner hole of the plunger wear-resistant outer sleeve in a threaded mode.

As the preferred technical scheme, the right plunger mounting sleeve is provided with a right plunger mounting sleeve insertion hole for inserting the lever.

As preferred technical scheme, be equipped with first sealed support cover between plunger hydraulic end left seal cover and the plunger right side installation cover bulge loop.

As preferred technical scheme, be equipped with the sealed support sleeve of second between plunger hydraulic end right seal cover and the right ring platform.

As the preferred technical scheme, the left sealing sleeve of the plunger hydraulic end, the right sealing sleeve of the plunger hydraulic end, the second sealing support sleeve and the first sealing support sleeve are made of elastic materials and respectively form the left sealing sleeve of the plunger hydraulic end, the right sealing sleeve of the plunger hydraulic end, the second sealing support sleeve and the first sealing support sleeve.

As the preferred technical scheme, the rigidity of the left sealing sleeve at the hydraulic end of the plunger is smaller than that of the first sealing support sleeve, and the rigidity of the right sealing sleeve at the hydraulic end of the plunger is smaller than that of the second sealing support sleeve.

As the preferred technical scheme, the left sealing sleeve of the plunger hydraulic end and the right sealing sleeve of the plunger hydraulic end are respectively a left sealing sleeve of the plunger hydraulic end and a right sealing sleeve of the plunger hydraulic end which are made of polyurethane; the second sealing support sleeve and the first sealing support sleeve are both made of polytetrafluoroethylene.

As the preferred technical scheme, the cross sections of the left sealing sleeve at the hydraulic end of the plunger and the right sealing sleeve at the hydraulic end of the plunger are in a V shape with a right opening.

As the preferred technical scheme, the left end of the inner hole of the plunger left mounting sleeve compression nut is provided with an annular mounting step, an anti-eccentric sealing ring is mounted on the annular mounting step, and the radial inner peripheral surface of the anti-eccentric sealing ring is in contact with the plunger.

As the preferred technical scheme, the wear-resistant sealing ring is made of polytetrafluoroethylene.

The beneficial effects of the invention are as follows.

The large slurry particles in the liquid inlet valve pass through the through hole of the valve cover of the liquid inlet valve, the through hole of the valve seat of the liquid inlet valve and the annular liquid inlet groove of the liquid inlet valve. The liquid inlet valve spring is arranged in a space formed by the liquid inlet valve cover and the liquid inlet valve cover top plate, and the liquid inlet valve cover top plate is combined with the liquid inlet valve cover, so that large slurry particles are prevented from entering the liquid inlet valve spring, the liquid inlet valve spring cannot be reset in time, the service life of the liquid inlet valve spring is prolonged, and the working stability of the liquid inlet valve spring is ensured; the maintenance times of the pump are reduced.

The liquid outlet valve adopts a spherical structure, so that the liquid inlet amount is ensured.

The water retaining disc is arranged, so that liquid in the valve box body can be effectively prevented from entering the power end along the plunger.

The plunger is provided with the plunger wear-resisting outer sleeve, so that the service life of the plunger is prolonged.

The constant-pressure water injection pump injects water pressure to the second circular cylindrical water-through gap through the second water injection pipe, and can extrude the surfaces of the first sealing ring and the second sealing ring sealing plunger; the existence of end ring, spacer ring, the interval of the left and right both ends of the radial inner peripheral surface of first sealing ring, second sealing ring all is greater than the interval of the left and right both ends of its radial outer peripheral surface, can make first sealing ring, second sealing ring laminate with the surface of plunger better all the time. Install on the ring dress step and prevent the sealing ring that rubs partially, can prevent first sealing ring, second sealing ring eccentric wear. The second separating ring provides effective space for the second circular ring cylinder-shaped water through gap;

the constant-pressure water injection pump always applies constant pressure to the left sealing sleeve at the hydraulic end of the plunger, the right sealing sleeve at the hydraulic end of the plunger, the second sealing support sleeve and the first sealing support sleeve; the left sealing sleeve at the hydraulic end of the plunger and the right sealing sleeve at the hydraulic end of the plunger are made of polyurethane; the second sealing support sleeve and the first sealing support sleeve are made of polytetrafluoroethylene, and the left sealing sleeve at the hydraulic end of the plunger, the right sealing sleeve at the hydraulic end of the plunger, the second sealing support sleeve and the first sealing support sleeve have certain elasticity; plunger fluid end left sealing cover, plunger fluid end right sealing cover, second seal support cover, first seal support cover can be fine with the radially outer peripheral surface laminating of plunger. When the medium in the valve box body moves along the plunger, the tightness of the left sealing sleeve at the hydraulic end of the plunger and the tightness of the right sealing sleeve at the hydraulic end of the plunger are adjusted according to the water pressure of the constant-pressure water injection pump, the pressure value of the constant-pressure water injection pump is set to be higher than the pressure in the valve box body, water of the constant-pressure water injection pump is introduced into the circular cylindrical water through gap, high pressure is formed at the circular cylindrical water through gap, the left sealing sleeve at the hydraulic end of the plunger and the plunger form high-pressure sealing due to pressure tensioning, the high-pressure sealing cannot be leaked, the right sealing sleeve at the hydraulic end of the plunger is pressed by the pressure in the valve box body and the constant-pressure pump to obtain double. The first partition ring ensures the stability of the circular cylindrical water-through gap space; the uniform rigidity of the left sealing sleeve at the hydraulic end of the plunger is smaller than that of the first sealing support sleeve, and the uniform rigidity of the right sealing sleeve at the hydraulic end of the plunger is smaller than that of the second sealing support sleeve, so that the left sealing sleeve at the hydraulic end of the plunger and the right sealing sleeve at the hydraulic end of the plunger are prevented from being worn too fast. The left sleeve ring and the right sleeve ring at the hydraulic end of the plunger play a role in protecting the left sealing sleeve and the right sealing sleeve at the hydraulic end of the plunger. The water injected by the constant-pressure water injection pump is used as a lubricant, and compared with lubricating oil, the environment is not polluted. The constant-pressure water injection pump is connected with the first flow rate over-value alarm and the second flow rate over-value alarm, and the first flow rate over-value alarm and the second flow rate over-value alarm remind of replacing the sealing device in time when the flow rate exceeds a set value, so that the constant-pressure water injection pump is used as a dual-purpose device; the working stability of the slurry pump can be effectively protected.

The mud pump adopting the structure has the advantages that the water yield is ensured, the work of the spring of the liquid inlet valve is not influenced even if the mud contains large-diameter mud particles, the liquid inlet quantity and the liquid outlet quantity are ensured, and the problem of sealing failure caused by the fact that the large-diameter mud particles enter a sealing system and frequently move the plunger piston can be effectively prevented by adopting the constant-pressure sealing with the double-purpose constant-pressure water injection pump.

The rigidity of the left sealing sleeve at the hydraulic end of the plunger is smaller than that of the first sealing support sleeve, and the rigidity of the right sealing sleeve at the hydraulic end of the plunger is smaller than that of the second sealing support sleeve, so that the left sealing sleeve at the hydraulic end of the plunger can be prevented from deforming too fast.

The plunger hydraulic end left sealing sleeve and the plunger hydraulic end right sealing sleeve are made of polyurethane; the second sealing support sleeve and the first sealing support sleeve are both made of polytetrafluoroethylene. Polytetrafluoroethylene, commonly known as "plastic king", is a high molecular polymer prepared by polymerization using tetrafluoroethylene as a monomer. The white wax-like paint has the advantages of good translucence, heat resistance and cold resistance, and can be used for a long time at-180-260 ℃. The material has the characteristics of acid resistance, alkali resistance and various organic solvents resistance, and is almost insoluble in all solvents. Meanwhile, the polytetrafluoroethylene has the characteristic of high temperature resistance, has extremely low friction coefficient, can be used for lubricating, and becomes an ideal coating for easily cleaning the inner layer of the water pipe.

Drawings

FIG. 1 is a schematic structural view of a dual hydraulic seal mud pump according to a preferred embodiment 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 E of fig. 2.

Fig. 4 is a partially enlarged view of a portion F of fig. 2.

Fig. 5 is a partially enlarged view of a portion B of fig. 1.

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

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

Fig. 8 is a partially enlarged view of a portion C of fig. 1.

Fig. 9 is a partially enlarged view of a portion D of fig. 1.

Wherein: a hydraulic end-1, a transmission device-11;

a power end-2;

the valve box comprises a valve box body-3, a liquid inlet-31, a liquid outlet-32, a valve box body inner cavity-33, a right ring table-34, a second sealing support sleeve-35, a plunger hydraulic end left sealing sleeve-36, a plunger hydraulic end left sleeve-37, a plunger hydraulic end right sleeve-38, a plunger hydraulic end right sealing sleeve-39, a first circular cylinder-shaped water through gap-310, a first partition ring-311, a first water injection pipe-312, a constant pressure water injection pump-313, a first flow rate over-value alarm-314 and a first sealing support sleeve-315;

plunger-4, water-retaining disk-41, plunger inner core-42 and plunger wear-resistant outer sleeve-43;

liquid outlet valve-5, liquid outlet valve seat-51, liquid outlet valve cover-52, liquid outlet valve steel ball-53, liquid outlet valve liquid outlet hole-54 and liquid outlet valve elastic pad-55;

the liquid inlet valve comprises a liquid inlet valve-6, a liquid inlet valve seat-61, a liquid inlet valve cover-62, a liquid inlet valve cover boss-63, a liquid inlet valve cover top plate-64, a liquid inlet valve spring-65, an adjusting cushion ring-66, a liquid inlet valve cover through hole-67, a liquid inlet valve seat through hole-68, a liquid inlet valve annular liquid inlet groove-69, a liquid inlet valve connecting screw-610 and a liquid inlet valve connecting screw-65;

the plunger left mounting sleeve comprises a plunger left mounting sleeve-7, a plunger left mounting sleeve gland nut-71, a mud scraping ring-72, a bottom ring-73, a first sealing ring-74, a spacer ring-75, a second sealing ring-76, a second circular cylindrical water through gap-77, a second water injection pipe-78, a second flow rate over-value alarm-79, a first metal lantern ring-710, a second metal lantern ring-711, a second spacer ring-712 and an anti-friction sealing ring-713;

a plunger right mounting sleeve-8, a plunger right mounting sleeve convex ring-80 and a plunger right mounting sleeve insertion hole-81.

Detailed Description

The invention is further described below with reference to the following figures and examples.

Example 1. As shown in fig. 1-9, a double hydraulic pressure sealing mud pump comprises a hydraulic end 1 and a power end 2, wherein a plurality of liquid pumping systems are arranged between the hydraulic end 1 and the power end 2.

Each liquid pumping system comprises a valve box body 3 and a plunger 4; a liquid inlet 31 is arranged at the lower end of each valve box body 3, a liquid outlet 32 is arranged at the upper end of each valve box body 3, and a valve box body inner cavity 33 is arranged in each valve box body 3; each valve box body 3 is arranged on the hydraulic end 1; the upper end of the inner cavity 33 of the valve box body of the valve box is provided with a liquid outlet valve 5, and the lower end of the inner cavity 33 of the valve box body of the valve box is provided with a liquid inlet valve 6; the valve box housing cavity 33 is circular in cross-section.

The power end 2 is provided with left plunger mounting holes on the right left side of each valve box body 3, and left plunger mounting sleeves 7 are coaxially mounted on the right side surfaces of the left plunger mounting holes; a plunger right mounting hole is formed in the left side face of each valve box body 3, and a plunger right mounting sleeve 8 is coaxially mounted on the plunger right mounting hole; the plunger 4 passes through the left plunger mounting hole, the left plunger mounting sleeve 7, the right plunger mounting hole and the right plunger mounting sleeve 8.

The length of the plunger 4 is greater than the distance between the right side surface of the plunger right mounting sleeve 8 and the left side surface of the plunger left mounting sleeve 7, and the left end of the plunger 4 is connected with a transmission device 11 of a slurry pump; the right end of the plunger 4 is positioned in the middle of the valve box body inner cavity 33 of the valve box body 3.

A right annular table 34 is mounted on the left side surface of the valve box body 3, threads are arranged on the radial outer peripheral surface of the right annular table 34, and the right end of the plunger right mounting sleeve 8 is sleeved on the right annular table 34; a plunger right mounting sleeve convex ring 80 is arranged on the radial inner peripheral surface of the front end of the plunger right mounting sleeve 8, and the radial inner peripheral surface of the plunger right mounting sleeve convex ring 80 is in contact with the plunger; the plunger right mounting sleeve convex ring 80 and the radial inner peripheral surface of the right annular table 34 are both contacted with the plunger; a plunger hydraulic end left sealing sleeve 36, a plunger hydraulic end left sleeve ring 37, a plunger hydraulic end right sleeve ring 38 and a plunger hydraulic end right sealing sleeve 39 are arranged in a closed space formed among the plunger right mounting sleeve convex ring 80, the plunger 4 and the right annular table 34 from right to left, a first circular cylindrical water through gap 310 for water injection is arranged between the plunger hydraulic end left sleeve ring 37 and the plunger hydraulic end right sleeve ring 38, and the first circular cylindrical water through gap 310 is connected with a constant-pressure water injection pump 313 through a first water injection pipe 312 penetrating through the plunger right mounting sleeve 8; the first water injection pipe 312 is provided with a first flow rate over-value alarm 314, and when the flow rate of the first water injection pipe 312 exceeds a set value, the first flow rate over-value alarm 314 alarms; the central axis of the first water injection pipe 312 is perpendicular to the central axis of the right plunger mounting sleeve 8; the first annular cylindrical water passage gap 310 is provided with a first partition ring 311.

The liquid inlet valve 6 comprises a liquid inlet valve seat 61 with a circular cross section, and the aperture of the bottom end of the liquid inlet valve seat 61 is smaller than the apertures of the rest parts; the inner hole of the liquid inlet valve seat 61 is internally provided with a liquid inlet valve cover 62 with an upward opening and a U-shaped section vertical to the ground; the top end of the liquid inlet valve seat 61 is connected with a liquid inlet valve cover through a screw; the liquid inlet valve cover comprises a liquid inlet valve cover top plate 64 capable of sealing the top of the inner hole of the liquid inlet valve seat 61 and a liquid inlet valve cover boss 63 inserted into an upward opening in the liquid inlet valve cover 62; the liquid inlet valve cover boss 63 is connected with the liquid inlet valve cover 62 through a liquid inlet valve spring 65 which is vertically arranged; the top end of the liquid inlet valve cover 62 is connected with an adjusting and protecting gasket ring 66, the liquid inlet valve cover boss 63 penetrates through the adjusting and protecting gasket ring 66, and the top end of the adjusting and protecting gasket ring 66 is not contacted with the liquid inlet valve cover top plate 64; a plurality of liquid inlet valve cover through holes 67 are vertically formed in the liquid inlet valve cover top plate 64, and liquid inlet valve seat through holes 68 which are communicated with the liquid inlet valve cover through holes 67 and are vertically formed are arranged right below the liquid inlet valve seat 61; an annular liquid inlet groove 69 of the liquid inlet valve is arranged on an inner hole at the bottom end of the liquid inlet valve seat 61, and the annular liquid inlet groove 69 of the liquid inlet valve is connected with the through hole 68 of each liquid inlet valve seat; the bottom end of the intake valve cover 62 contacts the annular intake channel 69 and seals the annular intake channel 69.

The large particles of slurry in the liquid inlet valve 6 pass through the through hole of the valve cover of the liquid inlet valve, the through hole of the valve seat of the liquid inlet valve and the annular liquid inlet groove of the liquid inlet valve. The liquid inlet valve spring is arranged in a space formed by the liquid inlet valve cover and the liquid inlet valve cover top plate, and the liquid inlet valve cover top plate is combined with the liquid inlet valve cover, so that large slurry particles are prevented from entering the liquid inlet valve spring, the liquid inlet valve spring cannot be reset in time, the service life of the liquid inlet valve spring is prolonged, and the working stability of the liquid inlet valve spring is ensured; the maintenance times of the pump are reduced.

The liquid outlet valve 5 comprises a liquid outlet valve seat 51 in a circular ring cylinder shape and a liquid outlet valve cover 52 with a downward opening, and the diameter of the top end of the liquid outlet valve seat 51 is smaller than that of the inner cavity 33 of the valve box body; the radial inner peripheral surface of the bottom end of the liquid outlet valve cover 52 is in threaded connection with the radial outer peripheral surface of the top end of the liquid outlet valve seat 51; the top end of the liquid outlet valve seat 51 is provided with a liquid outlet valve steel ball 53 capable of sealing the radial inner peripheral surface of the top end of the liquid outlet valve seat 51, and the liquid outlet valve steel ball 53 is positioned in the liquid outlet valve cover 52; the liquid outlet valve cover 52 is provided with a liquid outlet valve hole 54; an elastic cushion 55 of the liquid outlet valve is arranged right above the steel ball 53 of the liquid outlet valve on the valve cover 52 of the liquid outlet valve.

The liquid outlet valve 5 adopts a spherical structure, so that the liquid inlet amount is ensured.

A plunger left mounting sleeve compression nut 71 is in threaded connection with the radial inner peripheral surface of the right end of the plunger left mounting sleeve 7, and the radial inner peripheral surface of the plunger left mounting sleeve compression nut 71 is in contact with the plunger;

a mud scraping ring 72, a bottom ring 73, a first sealing ring 74, a spacer ring 75, a second sealing ring 76, a first metal lantern ring 710 and a second metal lantern ring 711 are sequentially arranged between the plunger left mounting sleeve pressing nut 71 and the power end 2 in the plunger left mounting sleeve 7 from inside left to right, and a second cylindrical water-through gap 77 is arranged between the first metal lantern ring 710 and the second metal lantern ring 711; the second annular cylindrical water passage space 77 is provided with a second partition ring 712.

The second circular cylindrical water passage gap 77 is connected with a constant-pressure water injection pump 313 through a second water injection pipe 78 penetrating through the left plunger mounting sleeve 7; a second flow rate over-value alarm 79 is arranged on the second water injection pipe 78, and when the flow rate of the second water injection pipe 78 exceeds a set value, the second flow rate over-value alarm 79 gives an alarm; the central axis of the second water injection pipe 78 is perpendicular to the central axis of the plunger left mounting sleeve 7; the distance between the left and right ends of the radial inner peripheral surfaces of the bottom ring 73 and the spacer ring 75 is smaller than the distance between the left and right ends of the radial outer peripheral surfaces; the bottom ring 73 and the spacer ring 75 are made of metal; the distance between the left and right ends of the radially inner peripheral surfaces of the first seal ring 74 and the second seal ring 76 is larger than the distance between the left and right ends of the radially outer peripheral surfaces thereof.

The left plunger mounting sleeve compression nut 71 is provided with a mud scraping ring 72, a bottom ring 73, a first sealing ring 74, a spacer ring 75, a second sealing ring 76, a second cylindrical water flowing gap 77, a second water filling pipe 78, a second flow rate over-value alarm 79, a first metal lantern ring 710, a second metal lantern ring 711 and a second spacer ring 712.

The middle part of the plunger 4 is sleeved with a water retaining disc 41, and the diameter of the water retaining disc 41 is larger than that of the right plunger mounting sleeve 8.

The water retaining disc is arranged, so that liquid in the valve box body 3 can be effectively prevented from entering the power end along the plunger 4.

The plunger 4 comprises a plunger wear-resistant outer sleeve 43 and a plunger inner core 42 which are in a circular ring cylinder shape, and the plunger inner core 42 is installed on an inner hole of the plunger wear-resistant outer sleeve 43 in a threaded mode.

The plunger 4 is provided with a plunger wear-resistant outer sleeve 43, so that the service life of the plunger 4 is prolonged.

The constant-pressure water injection pump injects water pressure to the second circular cylindrical water-through gap through the second water injection pipe, and can extrude the surfaces of the first sealing ring and the second sealing ring sealing plunger; the existence of end ring, spacer ring, the interval of the left and right both ends of the radial inner peripheral surface of first sealing ring, second sealing ring all is greater than the interval of the left and right both ends of its radial outer peripheral surface, can make first sealing ring, second sealing ring laminate with the surface of plunger better all the time. Install on the ring dress step and prevent the sealing ring that rubs partially, can prevent first sealing ring, second sealing ring eccentric wear. The second partition ring gives the second cylindrical ring an effective space for the water passage gap.

The constant-pressure water injection pump always applies constant pressure to the left sealing sleeve at the hydraulic end of the plunger, the right sealing sleeve at the hydraulic end of the plunger, the second sealing support sleeve and the first sealing support sleeve; the left sealing sleeve at the hydraulic end of the plunger and the right sealing sleeve at the hydraulic end of the plunger are made of polyurethane; the second sealing support sleeve and the first sealing support sleeve are made of polytetrafluoroethylene, and the left sealing sleeve at the hydraulic end of the plunger, the right sealing sleeve at the hydraulic end of the plunger, the second sealing support sleeve and the first sealing support sleeve have certain elasticity; plunger fluid end left sealing cover, plunger fluid end right sealing cover, second seal support cover, first seal support cover can be fine with the radially outer peripheral surface laminating of plunger. When the medium in the valve box body moves along the plunger, the tightness of the left sealing sleeve at the hydraulic end of the plunger and the tightness of the right sealing sleeve at the hydraulic end of the plunger are adjusted according to the water pressure of the constant-pressure water injection pump, the pressure value of the constant-pressure water injection pump is set to be higher than the pressure in the valve box body, water of the constant-pressure water injection pump is introduced into the circular cylindrical water through gap, high pressure is formed at the circular cylindrical water through gap, the left sealing sleeve at the hydraulic end of the plunger and the plunger form high-pressure sealing due to pressure tensioning, the high-pressure sealing cannot be leaked, the right sealing sleeve at the hydraulic end of the plunger is pressed by the pressure in the valve box body and the constant-pressure pump to obtain double. The first partition ring 311 ensures the stability of the circular cylindrical water-through gap space; the uniform rigidity of the left sealing sleeve at the hydraulic end of the plunger is smaller than that of the first sealing support sleeve, and the uniform rigidity of the right sealing sleeve at the hydraulic end of the plunger is smaller than that of the second sealing support sleeve, so that the left sealing sleeve at the hydraulic end of the plunger and the right sealing sleeve at the hydraulic end of the plunger are prevented from being worn too fast. The left sleeve ring and the right sleeve ring at the hydraulic end of the plunger play a role in protecting the left sealing sleeve and the right sealing sleeve at the hydraulic end of the plunger. The water injected by the constant-pressure water injection pump is used as a lubricant, and compared with lubricating oil, the environment is not polluted. The constant-pressure water injection pump is connected with the first flow rate over-value alarm and the second flow rate over-value alarm, and the first flow rate over-value alarm and the second flow rate over-value alarm remind of replacing the sealing device in time when the flow rate exceeds a set value, so that the constant-pressure water injection pump is used as a dual-purpose device; the working stability of the slurry pump can be effectively protected.

The mud pump adopting the structure has the advantages that the water yield is ensured, the work of a spring of the liquid inlet valve cannot be influenced even if mud contains large-diameter mud particles, and the problem of sealing failure caused by the fact that the large-diameter mud particles enter a sealing system and frequently move the plunger piston can be effectively solved by adopting the constant-pressure sealing of a constant-pressure water injection pump dual-purpose.

And a plunger right mounting sleeve insertion hole 81 for inserting a lever is formed in the plunger right mounting sleeve 8.

A first sealing support sleeve 315 is arranged between the plunger hydraulic end left sealing sleeve 36 and the plunger right mounting sleeve convex ring 80.

A second sealing support sleeve 35 is arranged between the plunger hydraulic end right sealing sleeve 39 and the right annular table 34.

The plunger hydraulic end left sealing sleeve 36, the plunger hydraulic end right sealing sleeve 39, the second sealing support sleeve 35 and the first sealing support sleeve 315 are made of elastic materials, and the plunger hydraulic end left sealing sleeve 36, the plunger hydraulic end right sealing sleeve 39, the second sealing support sleeve 35 and the first sealing support sleeve 315 are made of elastic materials.

The plunger fluid end left sealing sleeve 36 has a stiffness less than the first seal support sleeve 315 and the plunger fluid end right sealing sleeve 39 has a stiffness less than the second seal support sleeve 35.

The rigidity of the plunger fluid end left sealing sleeve 36 is less than that of the first sealing support sleeve 315, and the rigidity of the plunger fluid end right sealing sleeve 39 is less than that of the second sealing support sleeve 35, so that the plunger fluid end left sealing sleeve 36 can be prevented from being deformed too fast.

The plunger hydraulic end left sealing sleeve 36 and the plunger hydraulic end right sealing sleeve 39 are respectively a plunger hydraulic end left sealing sleeve 36 and a plunger hydraulic end right sealing sleeve 39 which are made of polyurethane; the second sealing support sleeve 35 and the first sealing support sleeve 315 are both made of Polytetrafluoroethylene (PTFE) and are the second sealing support sleeve 35 and the first sealing support sleeve 315.

The plunger hydraulic end left sealing sleeve 36 and the plunger hydraulic end right sealing sleeve 39 are respectively a plunger hydraulic end left sealing sleeve 36 and a plunger hydraulic end right sealing sleeve 39 which are made of polyurethane; the second sealing support sleeve 35 and the first sealing support sleeve 315 are both made of polytetrafluoroethylene, and the second sealing support sleeve 35 and the first sealing support sleeve 315 are made of polytetrafluoroethylene. Polytetrafluoroethylene, commonly known as "plastic king", is a high molecular polymer prepared by polymerization using tetrafluoroethylene as a monomer. The white wax-like paint has the advantages of good translucence, heat resistance and cold resistance, and can be used for a long time at-180-260 ℃. The material has the characteristics of acid resistance, alkali resistance and various organic solvents resistance, and is almost insoluble in all solvents. Meanwhile, the polytetrafluoroethylene has the characteristic of high temperature resistance, has extremely low friction coefficient, can be used for lubricating, and becomes an ideal coating for easily cleaning the inner layer of the water pipe.

The cross sections of the plunger hydraulic end left sealing sleeve 36 and the plunger hydraulic end right sealing sleeve 39 are in a V shape with right openings.

The left end of the inner hole of the plunger left mounting sleeve compression nut 71 is provided with an annular mounting step, an anti-eccentric sealing ring 713 is mounted on the annular mounting step, and the radial inner peripheral surface of the anti-eccentric sealing ring 713 is in contact with the plunger 4.

The wear-resistant seal ring 713 is made of polytetrafluoroethylene.

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. The utility model provides a two hydraulic pressure sealing slush pump, includes hydraulic end (1), power end (2), is equipped with a plurality of drawing liquid systems, its characterized in that between hydraulic end (1), power end (2):

each liquid pumping system comprises a valve box body (3) and a plunger (4); a liquid inlet (31) is arranged at the lower end of each valve box body (3), a liquid outlet (32) is arranged at the upper end of each valve box body (3), and a valve box body inner cavity (33) of the valve box is arranged in each valve box body (3); each valve box body (3) is arranged on the hydraulic end (1); a liquid outlet valve (5) is arranged at the upper end of an inner cavity (33) of the valve box body of the valve box, and a liquid inlet valve (6) is arranged at the lower end of the inner cavity (33) of the valve box body of the valve box; the cross section of an inner cavity (33) of a valve box body of the valve box is circular;

the power end (2) is provided with a left plunger mounting hole at the right left side of each valve box body (3), and a left plunger mounting sleeve (7) is coaxially mounted on the right side surface of each left plunger mounting hole; a plunger right mounting hole is formed in the left side face of each valve box body (3), and a plunger right mounting sleeve (8) is coaxially mounted on the plunger right mounting hole; the plunger (4) penetrates through the left plunger mounting hole, the left plunger mounting sleeve (7), the right plunger mounting hole and the right plunger mounting sleeve (8);

the length of the plunger (4) is greater than the distance between the right side surface of the right plunger mounting sleeve (8) and the left side surface of the left plunger mounting sleeve (7), and the left end of the plunger (4) is connected with a transmission device (11) of a slurry pump; the right end of the plunger (4) is positioned in the middle of a valve box body inner cavity (33) of the valve box body (3);

a right annular table (34) is mounted on the left side face of the valve box body (3), threads are arranged on the radial outer peripheral surface of the right annular table (34), and the right end of a plunger right mounting sleeve (8) is sleeved on the right annular table (34); a plunger right mounting sleeve convex ring (80) is arranged on the radial inner peripheral surface of the front end of the plunger right mounting sleeve (8), and the radial inner peripheral surface of the plunger right mounting sleeve convex ring (80) is in contact with the plunger; the radial inner peripheral surfaces of the plunger right mounting sleeve convex ring (80) and the right ring platform (34) are in contact with the plunger; a plunger hydraulic end left sealing sleeve (36), a plunger hydraulic end left sleeve ring (37), a plunger hydraulic end right sleeve ring (38) and a plunger hydraulic end right sealing sleeve (39) are arranged in a closed space formed among the plunger right mounting sleeve convex ring (80), the plunger (4) and the right ring platform (34) from right to left, a first circular cylindrical water through gap (310) for water injection is arranged between the plunger hydraulic end left sleeve ring (37) and the plunger hydraulic end right sleeve ring (38), and the first circular cylindrical water through gap (310) is connected with a constant-pressure water injection pump (313) through a first water injection pipe (312) penetrating through the plunger right mounting sleeve (8); a first flow rate over-value alarm (314) is arranged on the first water injection pipe (312), and when the flow rate of the first water injection pipe (312) exceeds a set value, the first flow rate over-value alarm (314) gives an alarm; the central axis of the first water injection pipe (312) is vertical to the central axis of the right plunger mounting sleeve (8); a first separating ring (311) is arranged on the first circular cylindrical water passing gap (310);

the liquid inlet valve (6) comprises a liquid inlet valve seat (61) with a circular cross section, and the aperture of the bottom end of the liquid inlet valve seat (61) is smaller than the apertures of the rest parts; a liquid inlet valve cover (62) with an upward opening and a U-shaped section vertical to the ground is arranged in an inner hole of the liquid inlet valve seat (61); the top end of the liquid inlet valve seat (61) is connected with a liquid inlet valve cover through a screw; the liquid inlet valve cover comprises a liquid inlet valve cover top plate (64) capable of sealing the top of an inner hole of the liquid inlet valve seat (61) and a liquid inlet valve cover boss (63) inserted into an upward opening in the liquid inlet valve cover (62); the valve cover boss (63) of the liquid inlet valve is connected with the valve cover (62) of the liquid inlet valve through a liquid inlet valve spring (65) which is vertically arranged; the top end of the liquid inlet valve cover (62) is connected with an adjusting and protecting gasket ring (66), a liquid inlet valve cover boss (63) penetrates through the adjusting and protecting gasket ring (66), and the top end of the adjusting and protecting gasket ring (66) is not contacted with a liquid inlet valve cover top plate (64); a plurality of liquid inlet valve cover through holes (67) are vertically formed in the liquid inlet valve cover top plate (64), and liquid inlet valve seat through holes (68) which are communicated with the liquid inlet valve cover through holes (67) and are vertically formed are formed right below the liquid inlet valve cover through holes (67) in the liquid inlet valve seat (61); an annular liquid inlet groove (69) of a liquid inlet valve is arranged on an inner hole at the bottom end of the liquid inlet valve seat (61), and the annular liquid inlet groove (69) of the liquid inlet valve is connected with the through holes (68) of each liquid inlet valve seat; the bottom end of the liquid inlet valve cover (62) is in contact with the annular liquid inlet groove (69) of the liquid inlet valve and can seal the annular liquid inlet groove (69) of the liquid inlet valve;

the liquid outlet valve (5) comprises a liquid outlet valve seat (51) in a circular ring cylinder shape and a liquid outlet valve cover (52) with a downward opening, and the diameter of the top end of the liquid outlet valve seat (51) is smaller than that of the inner cavity (33) of the valve box body of the valve box; the radial inner peripheral surface of the bottom end of the liquid outlet valve cover (52) is in threaded connection with the radial outer peripheral surface of the top end of the liquid outlet valve seat (51); a liquid outlet valve steel ball (53) capable of sealing the radial inner peripheral surface of the top end of the liquid outlet valve seat (51) is arranged at the top end of the liquid outlet valve seat (51), and the liquid outlet valve steel ball (53) is positioned in the liquid outlet valve cover (52); a liquid outlet valve hole (54) is arranged on the liquid outlet valve cover (52); a liquid outlet valve elastic pad (55) is arranged right above a liquid outlet valve steel ball (53) on the liquid outlet valve cover (52);

the radial inner peripheral surface of the right end of the left plunger mounting sleeve (7) is in threaded connection with a left plunger mounting sleeve compression nut (71), and the radial inner peripheral surface of the left plunger mounting sleeve compression nut (71) is in contact with the plunger;

a mud scraping ring (72), a bottom ring (73), a first sealing ring (74), a spacer ring (75), a second sealing ring (76), a first metal lantern ring (710) and a second metal lantern ring (711) are sequentially arranged between a plunger left mounting sleeve compression nut (71) and the power end (2) in the plunger left mounting sleeve (7) from inside left to right, and a second cylindrical water-through gap (77) is arranged between the first metal lantern ring (710) and the second metal lantern ring (711); a second separating ring (712) is arranged on the second circular cylindrical water gap (77);

the second circular cylindrical water through gap (77) is connected with a constant-pressure water injection pump (313) through a second water injection pipe (78) penetrating through the left plunger mounting sleeve (7); a second flow rate over-value alarm (79) is arranged on the second water injection pipe (78), and when the flow rate of the second water injection pipe (78) exceeds a set value, the second flow rate over-value alarm (79) gives an alarm; the central axis of the second water injection pipe (78) is vertical to the central axis of the left plunger installation sleeve (7); the distance between the left end and the right end of the radial inner peripheral surface of the bottom ring (73) and the distance between the left end and the right end of the radial inner peripheral surface of the spacer ring (75) are smaller than the distance between the left end and the right end of the radial outer peripheral surface of the spacer ring; the bottom ring (73) and the spacer ring (75) are both made of metal; the distance between the left end and the right end of the radial inner peripheral surface of each of the first sealing ring (74) and the second sealing ring (76) is larger than that between the left end and the right end of the radial outer peripheral surface of each of the first sealing ring and the second sealing ring;

the middle part of the plunger (4) is sleeved with a water retaining disc (41), and the diameter of the water retaining disc (41) is larger than that of the right plunger mounting sleeve (8);

the plunger (4) comprises a plunger wear-resistant outer sleeve (43) and a plunger inner core (42) which are in a circular ring cylinder shape, and the plunger inner core (42) is installed on an inner hole of the plunger wear-resistant outer sleeve (43) in a threaded mode.

2. The dual hydraulic seal mud pump of claim 1, wherein: and a plunger right mounting sleeve insertion hole (81) for inserting a lever is formed in the plunger right mounting sleeve (8).

3. The dual hydraulic seal mud pump of claim 1, wherein: a first sealing support sleeve (315) is arranged between the plunger hydraulic end left sealing sleeve (36) and the plunger right mounting sleeve convex ring (80).

4. The dual hydraulic seal mud pump of claim 3, wherein: a second sealing support sleeve (35) is arranged between the right sealing sleeve (39) at the hydraulic end of the plunger and the right ring platform (34).

5. The dual hydraulic seal mud pump of claim 4, wherein: the left sealing sleeve (36) of the plunger hydraulic end, the right sealing sleeve (39) of the plunger hydraulic end, the second sealing support sleeve (35) and the first sealing support sleeve (315) are respectively a left sealing sleeve (36) of the plunger hydraulic end, a right sealing sleeve (39) of the plunger hydraulic end, a second sealing support sleeve (35) and a first sealing support sleeve (315) which are made of elastic materials.

6. The dual hydraulic seal mud pump of claim 4, wherein: the rigidity of the left sealing sleeve (36) at the hydraulic end of the plunger is less than that of the first sealing support sleeve (315), and the rigidity of the right sealing sleeve (39) at the hydraulic end of the plunger is less than that of the second sealing support sleeve (35).

7. The dual hydraulic seal mud pump of claim 4, wherein: the plunger hydraulic end left sealing sleeve (36) and the plunger hydraulic end right sealing sleeve (39) are both made of polyurethane, namely the plunger hydraulic end left sealing sleeve (36) and the plunger hydraulic end right sealing sleeve (39); the second sealing support sleeve (35) and the first sealing support sleeve (315) are both made of Polytetrafluoroethylene (PTFE) and made of PTFE.

8. The dual hydraulic seal mud pump of claim 4, wherein: the cross sections of the left sealing sleeve (36) at the hydraulic end of the plunger and the right sealing sleeve (39) at the hydraulic end of the plunger are in a V shape with a right opening.

9. The dual hydraulic seal mud pump of claim 1, wherein: the left end of the inner hole of the plunger left mounting sleeve compression nut (71) is provided with an annular mounting step, an anti-eccentric sealing ring (713) is mounted on the annular mounting step, and the radial inner peripheral surface of the anti-eccentric sealing ring (713) is in contact with the plunger (4).

10. The dual hydraulic seal mud pump of claim 9, wherein: the wear-resistant sealing ring (713) is made of polytetrafluoroethylene.