CN112832971A

CN112832971A - Liquid pumping system of piston type mud pump with circulating cleaning device

Info

Publication number: CN112832971A
Application number: CN202110149393.2A
Authority: CN
Inventors: 李洪平; 李鲁杰; 张梅
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 liquid pumping system of a piston type mud pump with a circulating cleaning device, which comprises a piston rod, a piston pipe, a valve box body, a piston pipe installation pipe, a liquid inlet pipe, a cleaning and lubricating device and a pump body, wherein the piston pipe installation pipe is arranged on the piston rod; the piston rod comprises a left end part of the piston rod and a piston rod body which are transversely and coaxially arranged; the cleaning and lubricating device comprises a water suction pump, and the water suction pump is arranged on the piston pipe mounting pipe or outside the piston pipe mounting pipe; a water tank and a sand setting tank are arranged outside the piston pipe mounting pipe; the liquid pumping system of the piston type mud pump provided with the circulating cleaning device is smooth in liquid inlet and liquid outlet and can automatically adjust the piston when the sand content in the mud is high and high pressure exists, and the cleaning lubricating device is adopted, so that the accumulation of large-diameter mud particles on the surface of the plunger piston can be effectively prevented, and the problem of sealing failure caused by frequent movement is reduced.

Description

Liquid pumping system of piston type mud pump with circulating cleaning device

Technical Field

The invention relates to the technical field of mud pumps, in particular to a liquid pumping system of a piston type mud pump, which is provided with a circulating cleaning device.

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 piston of the piston mud pump of the existing mud pump is made of metal materials and wear-resistant materials, and the piston bears certain high pressure due to repeated movement, so that the requirement of the piston on the machining precision is high. Because the piston needs reciprocating motion, the wear-resisting material must be clamped very tightly, wastes time and energy when the piston is changed, and is very difficult. In addition, the pumping pressure born by the piston in the prior art is fixed, and the piston cannot adapt to the sudden change of the working environment of the slurry pump when large pumping pressure is needed for a short time, so that the damage to each component of the piston is easily caused. Especially, when the medium contains sand with larger grain diameter, the piston rod reciprocates, the sand with larger grain diameter can be accumulated on the surface of the piston rod, and the abrasion of the piston rod can be increased. The piston, liquid inlet valve and liquid outlet valve of slurry pump work under the condition of high temperature, high pressure and high speed, when the pressure in pump is not uniform, the liquid inlet and liquid outlet quantity is insufficient, and the service life of liquid inlet valve and liquid outlet valve is short, and they must be changed periodically.

Disclosure of Invention

The invention aims to provide a liquid pumping system of a piston type mud pump with a circulating cleaning device, which aims to solve the problems that the piston provided by the background technology is difficult to replace, the mud pump cannot adapt to large pumping pressure when the working environment of the mud pump changes suddenly and needs large pumping pressure for a short time, and the problems that the finished liquid inlet and the liquid outlet are insufficient and the piston rod is abraded when the medium contains sand with larger particle size.

The technical scheme adopted by the invention is as follows.

A liquid pumping system of a piston type mud pump with a circulating cleaning device comprises a piston rod, a piston pipe, a valve box body, a piston pipe installation pipe, a liquid inlet pipe, a cleaning and lubricating device and a pump body; the piston rod comprises a piston rod left end part and a piston rod body which are transversely and coaxially arranged.

The piston tube mounting tube is transversely arranged on the pump body, the left end of the piston tube mounting tube is provided with a piston tube mounting tube end cover, the centroid of the piston tube mounting tube end cover is transversely provided with the piston tube, the piston is mounted in the piston tube, and the piston is sleeved on the left end part of the piston rod; the right end of the piston pipe is provided with a piston pipe end cover; the piston rod body passes through the piston pipe end cover.

The cleaning and lubricating device comprises a water suction pump, and the water suction pump is arranged on the piston pipe mounting pipe or outside the piston pipe mounting pipe; a water tank, a sand setting tank and a liquid pump are arranged outside the piston pipe mounting pipe; the bottom surface of the piston pipe mounting pipe is provided with a piston pipe mounting pipe water outlet hole, and the bottom end of the piston pipe end cover is provided with a piston pipe end cover water outlet hole; the top end of the piston tube end cover is provided with a piston tube end cover water inlet hole; the water suction pump is connected with a water inlet hole of the piston pipe end cover through a first pipeline penetrating through the piston pipe mounting pipe; the water outlet hole of the piston pipe mounting pipe is connected with the sand settling tank through a second pipeline; the water tank is connected with the water pump through a third pipeline; the water tank is connected with the sand sediment box through a fourth pipeline, and a liquid pump is arranged on the fourth pipeline.

The valve box body comprises a valve box body inner cavity with a round cross section, a liquid inlet is formed in the lower end of the valve box body inner cavity on the valve box body, and a liquid outlet is formed in the upper end of the valve box body inner cavity on the valve box body; a liquid inlet valve and a liquid outlet valve are arranged in the inner cavity of the valve box body, and the liquid outlet valve is positioned above the liquid inlet valve; the liquid inlet pipe is connected with a liquid inlet of the inner cavity of the valve box body.

The left end of the piston pipe is connected with the inner cavity of the valve box body; .

The piston comprises a piston body, a piston seat, a piston support ring, a piston spring, a piston pressing pad and a backstop bolt which are sleeved on the left end part of the piston rod and are coaxially arranged with the left end part of the piston rod, and the sections of the piston body, the piston seat, the piston support ring, the piston spring and the piston pressing pad, which are vertical to the central axis of the left end part of the piston rod, are all in a ring shape; a piston seat, a piston spring, a piston pressing pad and a backstop bolt are sequentially arranged on the radial peripheral surface of the left end part of the piston rod from right to left; the right end of the piston pressing pad is coaxially provided with a circular column-shaped piston pressing pad ring pipe; the left end of the piston seat is coaxially provided with a circular column-shaped piston seat ring pipe; the left end of the piston spring is positioned in the piston pressing cushion ring pipe, and the right end of the piston spring is positioned in the piston seat ring pipe; the section of the piston supporting ring is concave, and the piston supporting ring is coaxially arranged on the side wall of the piston seat close to the piston pressing pad; the piston body is arranged on the piston support ring; a radially outer peripheral surface of the piston body is in contact with a radially inner peripheral surface of the piston tube; the radial inner peripheral surface of the piston body is contacted with the radial outer peripheral surface of the piston pressing pad ring pipe and the radial outer peripheral surface of the piston seat ring pipe; the diameter of the left end part of the piston rod is smaller than that of the piston rod body; the right side surface of the piston seat is contacted with the left side surface of the piston rod body.

The stopping bolt is installed on the left end part of the piston rod in a threaded mode, and the right side face of the stopping bolt is in contact with the left side face of the piston pressing pad; the radial outer peripheral surface of the piston seat is provided with an annular groove, a sealing ring is arranged in the annular groove, and the radial outer peripheral surface of the sealing ring is in contact with the radial inner peripheral surface of the piston pipe.

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 the 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 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 with a circular cross section, and the aperture of the bottom end of the liquid outlet valve seat is smaller than that of the rest part of the liquid outlet valve seat; a liquid outlet valve cover with an upward opening and a U-shaped section perpendicular to the ground is arranged in the inner hole of the liquid outlet valve seat; the top end of the liquid outlet valve seat is connected with a liquid outlet valve cover through a screw; the liquid outlet valve cover comprises a liquid outlet valve cover top plate capable of sealing the top of an inner hole of the liquid outlet valve seat and a liquid outlet valve cover boss inserted into an upward opening in the liquid outlet valve cover; the boss of the valve cover of the liquid outlet valve is connected with the valve cover of the liquid outlet valve through a liquid outlet valve spring which is vertically arranged; the top end of the liquid outlet valve cover is connected with an adjusting and protecting pad ring, a boss of the liquid outlet 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 a top plate of the liquid outlet valve cover; a plurality of liquid outlet valve cover through holes are vertically formed in the top plate of the liquid outlet valve cover, and liquid outlet valve seat through holes which are communicated with the liquid outlet valve cover through holes and are vertically formed are formed right below the liquid outlet valve cover through holes in the liquid outlet valve seat; an annular liquid inlet groove of the liquid outlet valve is arranged on an inner hole at the bottom end of the liquid outlet valve seat and is connected with the through holes of the liquid outlet valve seats; the bottom end of the liquid outlet valve cover is contacted with the annular liquid inlet groove of the liquid outlet valve and can seal the annular liquid inlet groove of the liquid outlet valve.

Preferably, a distance between the left side surface and the right side surface of the radially outer peripheral surface of the piston body is larger than a distance between the left side surface and the right side surface of the radially inner peripheral surface of the piston body.

As the preferred technical scheme, be equipped with the piston pipe through-hole on the stopper rod protective sheath end cover, be equipped with the fixed cover of piston pipe on the piston pipe through-hole, the piston pipe passes through the fixed cover of piston pipe to be fixed on piston installation pipe through-hole.

As a preferred technical scheme, a left locking nut is arranged on the radial outer peripheral surface of the piston pipe fixing sleeve and tightly attached to the left side surface of the piston pipe mounting pipe end cover, a left step-shaped through hole is formed in the left locking nut, threads are arranged in the left step-shaped through hole, and the left locking nut is in threaded connection with the radial outer peripheral surfaces of the piston pipe fixing sleeve and the piston pipe; a convex ring is arranged on the radial peripheral surface of the middle part of the piston tube fixing sleeve, and the left side surface of the convex ring is contacted with the right side surface of the piston tube mounting tube end cover;

the radial inner peripheral surface of the piston tube fixing sleeve is provided with an annular boss, and the left side surface of the annular boss is contacted with the right side surface of the convex ring.

As preferred technical scheme, piston pipe fixed cover and piston pipe through-hole threaded connection on the piston pipe installation pipe end cover.

As preferred technical scheme, the piston pipe is in threaded connection with the piston pipe fixing sleeve.

As a preferred technical scheme, the piston pipe comprises a steel piston pipe body and a wear-resisting sleeve arranged on the radial inner peripheral surface of the piston pipe body. The lock nut is screwed to the radially outer peripheral surface of the piston tube body.

As preferred technical scheme, the right flank of valve box body is equipped with piston pipe installation cover, and the radial inner peripheral surface of piston pipe installation cover is equipped with the screw thread, and the radial outer peripheral surface of piston pipe left end is equipped with the screw thread that suits with the radial inner peripheral surface of piston pipe installation cover, piston pipe installation cover and piston pipe left end threaded connection.

As the preferred technical scheme, the piston body is made of polyurethane; the piston support ring is made of carbon fiber.

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

The beneficial effects of the invention are as follows.

The piston rod body is provided with the cleaning and lubricating device, the piston rod body of the piston rod is lubricated by clear water, and even if a medium in the valve box body enters the piston rod body through the piston, the medium can be cleaned by the cleaning and lubricating device, so that the sand grains in the medium are prevented from being accumulated on the surface of the piston rod body, the abrasion of the piston rod body in the reciprocating motion is reduced, and the service lives of the piston and the piston rod body are prolonged.

By adopting the piston, firstly, the piston body is fixed by the piston pressing pad and the piston seat together, the piston spring is arranged in the middle for supporting, when the piston is disassembled, the piston pressing pad and the piston seat can be separated under the action of the piston spring as long as the backstop bolt is unscrewed, and the piston pressing pad is convenient to disassemble; secondly, because the middle is provided with the piston spring for supporting, the piston pressing pad is not contacted with the piston seat, thereby forming a reserved space between the pressing pad and the piston seat. When the working environment of the mud pump changes suddenly and needs a large pumping pressure for a short time, the piston spring can be further compressed under the action of the large pumping pressure due to the existence of the reserved space to realize self-regulation, so that the working stability of the mud pump is improved. Thirdly, because the piston spring is always stressed, the piston is always kept in an elastic state, and the service life of the piston is prolonged. Fourthly, the anti-eccentric friction sealing ring and the piston body are used for double sealing, and the piston sealing effect is good.

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.

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

The mud pump adopting the structure can prevent the influence of large mud particles on liquid inlet and outlet, the piston can be adjusted when high pressure exists momentarily, and the cleaning and lubricating device can effectively prevent the large-diameter mud particles from accumulating on the surface of the plunger piston and reduce the problem of sealing failure caused by frequent movement.

The piston body is made of polyurethane; the anti-eccentric seal ring is made of poly tetrachloroethylene; the piston support ring is made of carbon fiber. 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 rigidity of the piston support ring is larger than that of the piston body, and the piston body is prevented from being worn too fast.

Drawings

FIG. 1 is a schematic diagram of a preferred embodiment of the pumping system for a piston mud pump with a circulation wash apparatus according to 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 partially enlarged view of a portion C of fig. 1.

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

Fig. 6 is a partially enlarged view of a portion D of fig. 1.

Fig. 7 is a partially enlarged view of a portion F of fig. 6.

FIG. 8 is a schematic diagram of a preferred embodiment of the pumping system for a piston mud pump with a circulation wash apparatus according to the present invention.

Fig. 9 is a partially enlarged view of a portion G of fig. 8.

Fig. 10 is a partially enlarged view of a portion H of fig. 8.

Fig. 11 is a partially enlarged view of a portion I of fig. 8.

Wherein: a piston tube-1; a piston rod left end portion-11; piston tube end cap-12; a piston rod body-13; a piston tube body-14; a wear-resistant sleeve-15;

a piston-2; a piston body-21; a piston seat-22; a piston support ring-23; a piston spring-24; a piston compression pad-25; a backstop bolt-26; a backstop bolt-26; ring groove-27; a seal ring-28; piston pressing pad ring pipe-29; piston seat collar-210;

a valve box body-3; a liquid inlet pipe-31; valve box body cavity-32; liquid inlet-33; a liquid outlet-34; a piston tube mounting sleeve-35;

a piston tube mounting tube-4; the piston tube is provided with a tube end cover-41; a piston tube fixing sleeve-42; a left locking nut-43; a convex ring-44; an annular boss-45;

a liquid outlet valve-5; a liquid outlet valve seat-51; a liquid outlet valve cover-52; a boss-53 of the valve cover of the liquid outlet valve; a top plate-54 of the valve cover of the liquid outlet valve; a liquid outlet valve spring-55; adjusting a cushion ring-56; a through hole-57 is arranged on the valve cover of the liquid outlet valve; a through hole-58 of the valve seat of the liquid outlet valve; the liquid outlet valve is an annular liquid inlet groove-59; the liquid outlet valve is connected with a screw-510;

a liquid inlet valve-6; a liquid inlet valve seat-61; a liquid inlet valve cover-62; a boss-63 of the valve cover of the liquid inlet valve; a top plate-64 of the valve cover of the liquid inlet valve; a liquid inlet valve spring-65; adjusting a cushion ring-66; a through hole-67 of the valve cover of the liquid inlet valve; a through hole-68 of the valve seat of the liquid inlet valve; the liquid inlet valve is an annular liquid inlet tank-69; a liquid inlet valve is connected with a screw-610;

a water pump-7; water outlet-70 of the end cover of the piston pipe; -71 a water tank; the piston pipe is provided with a pipe water outlet-72; piston tube end cap water inlet-73; a first conduit-74; a second conduit-75; a third line-76;

a pump body-8;

a water pump-7; -71 a water tank; the piston pipe is provided with a pipe water outlet-72; piston tube end cap water inlet-73; a first conduit-74; a second conduit-75; a third line-76; a sand box-77; a liquid withdrawal pump-78; a fourth line-79.

Detailed Description

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

Example 1. As shown in fig. 1 to 7, a fluid pumping system of a piston-type mud pump provided with a circulation cleaning device is characterized in that: the device comprises a piston rod, a piston 2, a piston pipe 1, a valve box body 3, a piston pipe installation pipe 4, a liquid inlet pipe 31, a cleaning and lubricating device and a pump body 8; the piston rod comprises a piston rod left end part 11 and a piston rod body 13 which are transversely and coaxially arranged.

The piston tube mounting tube 4 is transversely arranged on the pump body 8, the left end of the piston tube mounting tube 4 is provided with a piston tube mounting tube end cover 41, the centroid of the piston tube mounting tube end cover 41 is transversely provided with the piston tube 1, a piston 2 is mounted in the piston tube 1, and the piston 2 is sleeved on the left end part 11 of the piston rod; the right end of the piston tube 1 is provided with a piston tube end cover 12; the piston rod body 13 passes through the piston tube end cap 12.

The cleaning and lubricating device comprises a water suction pump 7, and the water suction pump 7 is arranged on the piston pipe installation pipe 4; a water tank 71, a sand settling tank 77 and a liquid pump 78 are arranged outside the piston pipe mounting pipe 4; the bottom surface of the piston pipe mounting pipe 4 is provided with a piston pipe mounting pipe water outlet hole 72, and the bottom end of the piston pipe end cover 12 is provided with a piston pipe end cover water outlet hole 70; the top end of the piston tube end cover 12 is provided with a piston tube end cover water inlet 73; the water suction pump 7 is connected with a piston pipe end cover water inlet hole 73 through a first pipeline 74 penetrating through the piston pipe mounting pipe 4; the piston pipe mounting pipe water outlet 72 is connected with a sand settling tank 77 through a second pipeline 75; the water tank 71 is connected with the water pump 7 through a third pipeline 76; the water tank 71 is connected to the sand box 77 via a fourth line 79, on which fourth line 79 a liquid pump 78 is arranged.

The piston rod body 13 of the piston rod is lubricated by clean water, and even if a medium in the valve box body 3 enters the piston rod body 13 through the piston 2, the medium can be cleaned by the cleaning and lubricating device, so that sand grains in the medium are prevented from accumulating on the surface of the piston rod body 13, the abrasion of the piston rod body 13 in the reciprocating motion is reduced, and the service life of the piston and the piston rod body 13 is prolonged.

The valve box body 3 comprises a valve box body inner cavity 32 with a round cross section, a liquid inlet 33 is arranged at the lower end of the valve box body inner cavity 32 on the valve box body 3, and a liquid outlet 34 is arranged at the upper end of the valve box body inner cavity 32 on the valve box body 3; a liquid inlet valve 5 and a liquid outlet valve 6 are arranged in the inner cavity 32 of the valve box body, and the liquid outlet valve 6 is positioned above the liquid inlet valve 5; the liquid inlet pipe 31 is connected with a liquid inlet 33 of the valve box inner cavity 32.

The left end of the piston tube 1 is connected to the valve box body chamber 32 of the valve box body 3.

The piston 2 comprises a piston body 21, a piston seat 22, a piston supporting ring 23, a piston spring 24, a piston pressing pad 25 and a backstop bolt 26 which are sleeved on the left end part 11 of the piston rod and are coaxially arranged with the left end part 11 of the piston rod, and the sections, perpendicular to the central axis of the left end part 11, of the piston body 21, the piston seat 22, the piston supporting ring 23, the piston spring 24 and the piston pressing pad 25 are all in a circular ring shape; a piston seat 22, a piston spring 24, a piston pressing pad 25 and a backstop bolt 26 are sequentially arranged on the radial outer peripheral surface of the piston rod left end part 11 from right to left; the right end of the piston pressing pad 25 is coaxially provided with a circular column-shaped piston pressing pad ring pipe 29; the left end of the piston seat 22 is coaxially provided with a circular cylindrical piston seat ring pipe 210; the left end of the piston spring 24 is located in the piston press-down cushion collar 29 and the right end of the piston spring 24 is located in the piston seat collar 210; the section of the piston supporting ring 23 is concave, and the piston supporting ring 23 is coaxially arranged on the side wall of the piston seat 22 close to the piston pressing pad 25; the piston body 21 is mounted on a piston support ring 23; the radially outer peripheral surface of the piston body 21 is in contact with the radially inner peripheral surface of the piston tube 1; the radially inner peripheral surface of the piston body 21 contacts the radially outer peripheral surface of the piston packing collar 29 and contacts the radially outer peripheral surface of the piston seat collar 210; the diameter of the left end part 11 of the piston rod is smaller than that of the piston rod body 13; the right side surface of the piston seat 22 is in contact with the left side surface of the piston rod body 13.

The retaining bolt 26 is installed on the left end part 11 of the piston rod in a threaded mode, and the right side face of the retaining bolt is in contact with the left side face of the piston pressing pad 25; the radially outer peripheral surface of the piston body 21 is in contact with the radially inner peripheral surface of the piston tube 1; the radially outer peripheral surface of the piston seat 22 is provided with a ring groove 27, a seal ring 28 is provided in the ring groove 27, and the radially outer peripheral surface of the seal ring 28 is in contact with the radially inner peripheral surface of the piston tube 1.

By adopting the piston 2, firstly, the piston pressing pad 25 and the piston seat 22 are used for fixing the piston body 21 together, the piston spring 24 is arranged in the middle for supporting, when the piston is disassembled, the piston pressing pad 25 and the piston seat 22 can be separated under the action of the piston spring 24 as long as the backstop bolt 26 is unscrewed, and the piston pressing pad 25 is convenient to disassemble; secondly, because the middle is supported by the piston spring 24, the piston pressing pad 25 is not contacted with the piston seat 22, so that a reserved space is formed between the pressing pad 25 and the piston seat 22. When the working environment of the mud pump changes suddenly and needs a large pumping pressure for a short time, the piston spring 24 can be further compressed under the action of the large pumping pressure due to the existence of the reserved space to realize self-adjustment, so that the working stability of the mud pump is improved. Thirdly, because the piston spring 24 is always stressed, the piston is always kept in an elastic state, and the service life of the piston is prolonged. Fourthly, the anti-eccentric seal ring 28 and the piston body 21 are used for double sealing, and the piston sealing effect is good.

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 liquid inlet valve seat 61 is connected with the liquid inlet valve cover top plate 64 through a liquid inlet valve connecting screw 610.

The liquid outlet valve 5 comprises a liquid outlet valve seat 51 with a circular cross section, and the aperture of the bottom end of the liquid outlet valve seat 51 is smaller than that of the rest part; a liquid outlet valve cover 52 with an upward opening and a U-shaped section vertical to the ground is arranged in an inner hole of the liquid outlet valve seat 51; the top end of the liquid outlet valve seat 51 is connected with a liquid outlet valve cover through a screw; the liquid outlet valve cover comprises a liquid outlet valve cover top plate 54 capable of sealing the top of the inner hole of the liquid outlet valve seat 51 and a liquid outlet valve cover boss 53 inserted into an upward opening in the liquid outlet valve cover 52; the liquid outlet valve cover boss 53 is connected with the liquid outlet valve cover 52 through a liquid outlet valve spring 55 which is vertically arranged; the top end of the liquid outlet valve cover 52 is connected with an adjusting pad ring 56, the liquid outlet valve cover boss 53 penetrates through the adjusting pad ring 56, and the top end of the adjusting pad ring 56 is not contacted with the liquid outlet valve cover top plate 54; a plurality of liquid outlet valve cover through holes 57 are vertically formed in the liquid outlet valve cover top plate 54, and liquid outlet valve seat through holes 58 which are communicated with the liquid outlet valve cover through holes 57 and are vertically formed are arranged right below the liquid outlet valve cover through holes 57 on the liquid outlet valve seat 51; an annular liquid inlet groove 59 of the liquid outlet valve is arranged on an inner hole at the bottom end of the liquid outlet valve seat 51, and the annular liquid inlet groove 59 of the liquid outlet valve is connected with each liquid outlet valve seat through hole 58; the bottom end of the liquid outlet valve cover 52 is in contact with the annular liquid inlet groove 59 of the liquid outlet valve and can seal the annular liquid inlet groove 59 of the liquid outlet valve.

The outlet valve seat 51 is connected with the outlet valve cover top plate 54 through an outlet valve connecting screw 510. The piston press pad 25 and the piston press pad collar 29 are cast as one piece. The piston seat collar 210, the piston seat 22 are cast as one piece.

Slurry large particles in the liquid outlet valve 5 pass through the through hole of the valve cover of the liquid outlet valve, the through hole of the valve seat of the liquid outlet valve and the annular liquid inlet groove of the liquid outlet valve to enter and exit. The liquid outlet valve spring is arranged in a space formed by the liquid outlet valve cover and the liquid outlet valve cover top plate, and the liquid outlet valve cover top plate is combined with the liquid outlet valve cover, so that large slurry particles are prevented from entering the liquid outlet valve spring, the liquid outlet valve spring cannot be reset in time, the service life of the liquid outlet valve spring is prolonged, and the working stability of the liquid outlet valve spring is ensured; the maintenance times of the pump are reduced.

The distance between the left and right side surfaces of the radially outer peripheral surface of the piston body 21 is larger than the distance between the left and right side surfaces of the radially inner peripheral surface of the piston body 21.

The piston rod protective sleeve end cover 41 is provided with a piston pipe through hole, a piston pipe fixing sleeve 42 is arranged on the piston pipe through hole, and the piston pipe 1 is fixed on the piston installation pipe through hole through the piston pipe fixing sleeve 42.

A left locking nut 43 is arranged on the radial outer peripheral surface of the piston tube fixing sleeve 42 and clings to the left side surface of the piston tube mounting tube end cover 41, a left step-shaped through hole is formed in the left locking nut 43, threads are arranged in the left step-shaped through hole, and the left locking nut 43 is in threaded connection with the piston tube fixing sleeve 42 and the radial outer peripheral surface of the piston tube 1; a convex ring 44 is arranged on the radial outer peripheral surface of the middle part of the piston tube fixing sleeve 42, and the left side surface of the convex ring 44 is in contact with the right side surface of the piston tube mounting tube end cover 41.

An annular boss 45 is provided on the radially inner peripheral surface of the piston tube fixing sleeve 42, and the left side surface of the annular boss 45 is in contact with the right side surface of the convex ring 44.

The piston tube fixing sleeve 42 is in threaded connection with the piston tube through hole on the piston tube mounting tube end cover 41.

The piston tube 1 is in threaded connection with the piston tube fixing sleeve 42.

The right flank of valve box 3 is equipped with piston pipe installation cover 35, and the radial interior peripheral surface of piston pipe installation cover 35 is equipped with the screw thread, and the radial outer peripheral surface of 1 left end of piston pipe is equipped with the screw thread that suits with the radial interior peripheral surface of piston pipe installation cover 35, piston

pipe installation cover

35 and 1 left end threaded connection of piston pipe.

The piston body 21 is made of polyurethane; the piston support ring 23 is a piston support ring 23 made of carbon fiber.

The seal ring 28 is made of polytetrafluoroethylene.

The piston body 21 is made of polyurethane; the anti-eccentric seal ring 28 is made of poly tetrachloroethylene; the piston support ring 23 is a piston support ring 23 made of carbon fiber. The rest part of the piston 2 is made of metal. 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 piston support ring 23 is more rigid than the piston body 21 and prevents the piston body 21 from wearing out too quickly.

Example 2. The present embodiment differs from embodiment 1 as shown in fig. 8 to 11 in that: the left side surface of the piston tube fixing sleeve 42, which is close to the piston tube mounting tube end cover 41, on the radial peripheral surface is not provided with a left locking nut 43; the water suction pump 7 is arranged outside the piston pipe installation pipe 4. The piston tube 1 includes a steel piston tube body 14 and a wear sleeve 15 provided on a radially inner peripheral surface of the piston tube body 14. The lock nut 43 is screwed with the radially outer peripheral surface of the piston tube body 14.

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 liquid pumping system of piston slush pump with circulation belt cleaning device which characterized in that: comprises a piston rod, a piston (2), a piston pipe (1), a valve box body (3), a piston pipe mounting pipe (4), a liquid inlet pipe (31), a cleaning and lubricating device and a pump body (8); the piston rod comprises a piston rod left end part (11) and a piston rod body (13) which are transversely and coaxially arranged;

the piston tube mounting tube (4) is transversely arranged on the pump body (8), the left end of the piston tube mounting tube (4) is provided with a piston tube mounting tube end cover (41), the centroid of the piston tube mounting tube end cover (41) is transversely provided with the piston tube (1), a piston (2) is arranged in the piston tube (1), and the piston (2) is sleeved on the left end part (11) of the piston rod; the right end of the piston pipe (1) is provided with a piston pipe end cover (12); the piston rod body (13) penetrates through the piston pipe end cover (12);

the cleaning and lubricating device comprises a water suction pump (7), wherein the water suction pump (7) is arranged on the piston pipe mounting pipe (4) or outside the piston pipe mounting pipe (4); a water tank (71), a sand settling tank (77) and a liquid pump (78) are arranged outside the piston pipe mounting pipe (4); a piston pipe mounting pipe water outlet hole (72) is formed in the bottom surface of the piston pipe mounting pipe (4), and a piston pipe end cover water outlet hole (70) is formed in the bottom end of the piston pipe end cover (12); the top end of the piston tube end cover (12) is provided with a piston tube end cover water inlet hole (73); the water suction pump (7) is connected with a water inlet hole (73) of the piston pipe end cover through a first pipeline (74) penetrating through the piston pipe mounting pipe (4); the piston pipe mounting pipe water outlet hole (72) is connected with the sand settling tank (77) through a second pipeline (75); the water tank (71) is connected with the water suction pump (7) through a third pipeline (76); the water tank (71) is connected with the sand settling tank (77) through a fourth pipeline (79), and a liquid pump (78) is arranged on the fourth pipeline (79);

the valve box body (3) comprises a valve box body inner cavity (32) with a round cross section, a liquid inlet (33) is formed in the lower end of the valve box body inner cavity (32) on the valve box body (3), and a liquid outlet (34) is formed in the upper end of the valve box body inner cavity (32) on the valve box body (3); a liquid inlet valve (5) and a liquid outlet valve (6) are arranged in an inner cavity (32) of the valve box body, and the liquid outlet valve (6) is positioned above the liquid inlet valve (5); the liquid inlet pipe (31) is connected with a liquid inlet (33) of an inner cavity (32) of the valve box body;

the left end of the piston tube (1) is connected with a valve box body inner cavity (32) of the valve box body (3);

the piston (2) comprises a piston body (21), a piston seat (22), a piston supporting ring (23), a piston spring (24), a piston pressing pad (25) and a backstop bolt (26), wherein the piston body (21), the piston seat (22), the piston supporting ring (23), the piston spring (24), the piston pressing pad (25) and the backstop bolt (26) are sleeved on the left end part (11) of the piston rod and are coaxially arranged with the left end part (11) of the piston rod, and the sections, perpendicular to the central axis of the left end part (11) of the piston rod, of the piston body (21), the piston; a piston seat (22), a piston spring (24), a piston pressing pad (25) and a backstop bolt (26) are sequentially arranged on the radial outer peripheral surface of the left end part (11) of the piston rod from right to left; a circular cylindrical piston pressing pad ring pipe (29) is coaxially arranged at the right end of the piston pressing pad (25); the left end of the piston seat (22) is coaxially provided with a circular cylindrical piston seat ring pipe (210); the left end of the piston spring (24) is positioned in the piston pressing pad ring pipe (29), and the right end of the piston spring (24) is positioned in the piston seat ring pipe (210); the section of the piston supporting ring (23) is concave, and the piston supporting ring (23) is coaxially arranged on the side wall of the piston seat (22) close to the piston pressing pad (25); the piston body (21) is arranged on the piston support ring (23); a radially outer peripheral surface of the piston body (21) is in contact with a radially inner peripheral surface of the piston tube (1); a radially inner peripheral surface of the piston body (21) is in contact with a radially outer peripheral surface of the piston packing collar (29) and with a radially outer peripheral surface of the piston seat collar (210); the diameter of the left end part (11) of the piston rod is smaller than that of the piston rod body (13); the right side surface of the piston seat (22) is contacted with the left side surface of the piston rod body (13);

the backstop bolt (26) is arranged on the left end part (11) of the piston rod in a threaded mode, and the right side face of the backstop bolt is in contact with the left side face of the piston pressing pad (25); an annular groove (27) is formed in the radial outer peripheral surface of the piston seat (22), a sealing ring (28) is arranged in the annular groove (27), and the radial outer peripheral surface of the sealing ring (28) is in contact with the radial inner peripheral surface of the piston pipe (1);

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) with a circular cross section, and the aperture of the bottom end of the liquid outlet valve seat (51) is smaller than that of the rest part; a liquid outlet valve cover (52) with an upward opening and a U-shaped section vertical to the ground is arranged in an inner hole of the liquid outlet valve seat (51); the top end of the liquid outlet valve seat (51) is connected with a liquid outlet valve cover through a screw; the liquid outlet valve cover comprises a liquid outlet valve cover top plate (54) capable of sealing the top of an inner hole of the liquid outlet valve seat (51) and a liquid outlet valve cover boss (53) inserted into an upward opening in the liquid outlet valve cover (52); the liquid outlet valve cover boss (53) is connected with the liquid outlet valve cover (52) through a liquid outlet valve spring (55) which is vertically arranged; the top end of the liquid outlet valve cover (52) is connected with an adjusting pad ring (56), a boss (53) of the liquid outlet valve cover penetrates through the adjusting pad ring (56), and the top end of the adjusting pad ring (56) is not contacted with a top plate (54) of the liquid outlet valve cover; a plurality of liquid outlet valve cover through holes (57) are vertically formed in the liquid outlet valve cover top plate (54), and liquid outlet valve seat through holes (58) which are communicated with the liquid outlet valve cover through holes (57) and are vertically formed in the liquid outlet valve seat (51) are arranged right below the liquid outlet valve cover through holes (57); an annular liquid inlet groove (59) of the liquid outlet valve is arranged on an inner hole at the bottom end of the liquid outlet valve seat (51), and the annular liquid inlet groove (59) of the liquid outlet valve is connected with a through hole (58) of each liquid outlet valve seat; the bottom end of the liquid outlet valve cover (52) is contacted with the annular liquid inlet groove (59) of the liquid outlet valve and can seal the annular liquid inlet groove (59) of the liquid outlet valve.

2. The fluid pumping system for a piston-type mud pump provided with a circulation cleaning device as set forth in claim 1, wherein: the distance between the left side surface and the right side surface of the radial outer peripheral surface of the piston body (21) is larger than the distance between the left side surface and the right side surface of the radial inner peripheral surface of the piston body (21).

3. The fluid pumping system for a piston-type mud pump provided with a circulation cleaning device as set forth in claim 1, wherein: a piston pipe through hole is formed in the plug rod protective sleeve end cover (41), a piston pipe fixing sleeve (42) is arranged on the piston pipe through hole, and the piston pipe (1) is fixed on the piston installation pipe through hole through the piston pipe fixing sleeve (42).

4. The fluid pumping system for a piston-type mud pump provided with a circulation cleaning device as set forth in claim 3, wherein: a left locking nut (43) is arranged on the radial outer peripheral surface of the piston tube fixing sleeve (42) and tightly attached to the left side surface of the piston tube mounting tube end cover (41), a left step-shaped through hole is formed in the left locking nut (43), threads are arranged in the left step-shaped through hole, and the left locking nut (43) is in threaded connection with the radial outer peripheral surfaces of the piston tube fixing sleeve (42) and the piston tube (1); a convex ring (44) is arranged on the radial peripheral surface of the middle part of the piston tube fixing sleeve (42), and the left side surface of the convex ring (44) is contacted with the right side surface of the piston tube mounting tube end cover (41);

an annular boss (45) is arranged on the radial inner peripheral surface of the piston tube fixing sleeve (42), and the left side surface of the annular boss (45) is in contact with the right side surface of the convex ring (44).

5. The fluid pumping system for a piston-type mud pump provided with a circulation cleaning device as set forth in claim 3, wherein: the piston pipe fixing sleeve (42) is in threaded connection with a piston pipe through hole on the piston pipe mounting pipe end cover (41).

6. The fluid pumping system for a piston-type mud pump provided with a circulation cleaning device as set forth in claim 3, wherein: the piston tube (1) is in threaded connection with the piston tube fixing sleeve (42).

7. The fluid pumping system for a piston-type mud pump provided with a circulation cleaning device as set forth in claim 1, wherein: the piston pipe (1) comprises a steel piston pipe body (14) and a wear-resistant sleeve (15) arranged on the radial inner peripheral surface of the piston pipe body (14); a lock nut (43) is screwed with the radially outer peripheral surface of the piston tube body (14).

8. The fluid pumping system for a piston-type mud pump provided with a circulation cleaning device as set forth in claim 1, wherein: the right flank of valve box (3) is equipped with piston pipe installation cover (35), and the radial interior peripheral surface of piston pipe installation cover (35) is equipped with the screw thread, and the radial outer peripheral surface of piston pipe (1) left end is equipped with the screw thread that suits with the radial interior peripheral surface of piston pipe installation cover (35), piston pipe installation cover (35) and piston pipe (1) left end threaded connection.

9. The fluid pumping system for a piston-type mud pump provided with a circulation cleaning device as set forth in claim 1, wherein: the piston body (21) is made of polyurethane (21); the piston support ring (23) is made of carbon fiber.

10. The fluid pumping system for a piston-type mud pump provided with a circulation cleaning device as set forth in claim 1, wherein: the sealing ring (28) is a sealing ring (28) made of polytetrafluoroethylene.