CN112096940B - Reset type slurry open flow device for drilling pump - Google Patents

Reset type slurry open flow device for drilling pump Download PDF

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Publication number
CN112096940B
CN112096940B CN202010887035.7A CN202010887035A CN112096940B CN 112096940 B CN112096940 B CN 112096940B CN 202010887035 A CN202010887035 A CN 202010887035A CN 112096940 B CN112096940 B CN 112096940B
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China
Prior art keywords
main valve
valve body
control valve
piston
slurry
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CN202010887035.7A
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Chinese (zh)
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CN112096940A (en
Inventor
杜向阳
郝建旭
刘小龙
张斌
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China National Petroleum Corp
Baoji Oilfield Machinery Co Ltd
CNPC National Oil and Gas Drilling Equipment Engineering Technology Research Center Co Ltd
Original Assignee
China National Petroleum Corp
Baoji Oilfield Machinery Co Ltd
CNPC National Oil and Gas Drilling Equipment Engineering Technology Research Center Co Ltd
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Publication of CN112096940A publication Critical patent/CN112096940A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/044—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with more than one spring
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/10—Valve arrangements in drilling-fluid circulation systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/048—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded combined with other safety valves, or with pressure control devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/0486—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with mechanical actuating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/06—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for adjusting the opening pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/10—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with auxiliary valve for fluid operation of the main valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/164—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side and remaining closed after return of the normal pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/168—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side combined with manually-controlled valves, e.g. a valve combined with a safety valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0008—Mechanical means
    • F16K37/0016—Mechanical means having a graduated scale

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Lift Valve (AREA)

Abstract

The invention discloses a reset type slurry blowout device for a drilling pump, which comprises a main valve assembly, wherein a manual blowout valve assembly is arranged on the outer wall of the main valve assembly, one end of the main valve assembly is connected with a control valve assembly, the end part of the other end of the main valve assembly is connected with an outlet flange, the outer wall of the main valve assembly is connected with an outlet flange, and a connecting flange is connected with an inlet flange. The invention does not need to stop the pump and replace the shear pin in the working process, reduces the use and maintenance cost and the labor intensity of field operation workers, and improves the drilling operation efficiency. The control valve spring with lower rigidity is adopted to adjust the blowout pressure of the device, stepless and accurate adjustment of the blowout pressure can be realized, the blowout precision of the device is improved, the manual blowout valve assembly is arranged in the device, the pressure relief and slurry short-time air circulation functions of the drilling pump can be realized, a pressure relief bypass on a blowout pipeline is replaced, the structure of the pipeline is simplified, and the manufacturing cost of the pipeline is reduced.

Description

Reset type slurry open flow device for drilling pump
Technical Field
The invention belongs to the technical field of petroleum and natural gas exploration and development equipment, and relates to a reset type slurry open flow device for a drilling pump.
Background
In the process of drilling operation, when the bottom hole pressure is increased to cause the working pressure of the drilling pump to exceed the rated working pressure, the mud blowout device is required to act quickly, so that mud is blown out to avoid serious faults of the drilling pump, and the safety of the drilling operation and the service life of the drilling pump are guaranteed. Shear pin type safety valves and spring return type safety valves are commonly used at present.
The shear pin type safety valve adopts a lever principle, and when the working pressure of the drilling pump exceeds the set pressure of the safety valve, the piston rod pushes the shear pin plate to shear the shear pin, so that slurry is blown out. The design has simple structure, low production cost of the safety valve and wide application, but has some defects and shortcomings. Firstly, because the production batch of round pin axle is different, the difference of thermal treatment process leads to its quality unstable, and the open flow precision is low, and round pin axle only can be used once in addition, leads to its use maintenance cost higher. Secondly, the safety valve needs to be stopped and the shearing pin needs to be replaced after blowout, and then the drilling pump is restarted, so that the labor intensity of field operation workers is increased, and the drilling operation efficiency is reduced. Thirdly, in order to realize the function of carrying out short-time air circulation on mud in the normal drilling operation process of the drilling pump or carrying out pressure relief on the drilling pump after the drilling operation is finished, a special pressure relief bypass needs to be arranged in the blowout pipeline, so that the pipeline structure is complex, and the pipeline manufacturing cost is increased.
The spring reset type safety valve adopts the principle that the acting force of a spring on a piston is balanced with the acting force of mud on the piston, when the working pressure of the drilling pump rises, the acting force of the mud on the piston is greater than the acting force of the spring on the piston, the safety valve is opened to realize mud open-flow, and when the working pressure of the drilling pump falls, the acting force of the mud on the piston is less than the acting force of the spring on the piston, the safety valve is closed. The spring reset type safety valve does not use a shear pin and can realize an automatic reset function, the use and maintenance cost is reduced, the labor intensity of workers is reduced, and the drilling efficiency is improved. But because the effort of mud to the piston is great, the relief valve need set up the big rigid spring of multiunit and come the balanced effort of mud to the piston, just so lead to the structural size increase of relief valve, because spring rigidity is great, open flow pressure adjustment process relies on the scale to read numerical value, and reading error is great, consequently leads to the open flow precision of relief valve to be lower. At present, the safety valve mostly adopts an inlet piece, and the cost is higher.
Disclosure of Invention
The invention aims to provide a reset type slurry open flow device for a drilling pump, which solves the problems that the pipeline structure is complex and the selected part cost is high in the prior art.
The invention adopts the technical scheme that the reset type slurry blowout device for the drilling pump comprises a main valve assembly, wherein the outer wall of the main valve assembly is provided with a manual blowout valve assembly, one end of the main valve assembly is connected with a control valve assembly, the end part of the other end of the main valve assembly is connected with an outlet flange, the outer wall of the main valve assembly is connected with a connecting flange, and the connecting flange is connected with an inlet flange.
The invention is also characterized in that:
the main valve assembly comprises a main valve body, the main valve body is of a hollow shell structure, one end of the main valve body is axially provided with a cylindrical main valve piston channel, and a main valve piston component is arranged in the main valve piston channel; the other end of the main valve body is axially provided with a slurry outflow channel, the side wall of the main valve body is radially provided with a slurry inlet channel, and a main valve piston channel is communicated with the slurry outflow channel and the slurry inlet channel to form a slurry flowing space;
the outer wall of the main valve body is connected with a manual blowout valve assembly, one end of the main valve body is connected with a control valve assembly, the end part of the other end of the main valve body is connected with an outlet flange, the outer wall of the main valve body is connected with a connecting flange, and the connecting flange is connected with an inlet flange;
the joint surface of the main valve piston channel and the slurry outflow channel is provided with an annular groove.
The main valve piston assembly comprises a main valve piston, the main valve piston is of a stepped structure, a main valve spring channel is axially formed in one end of the main valve piston, a main valve spring is installed in the main valve spring channel, a slurry flow channel is axially formed in the other end of the main valve piston, the slurry flow channel is communicated with the main valve spring channel, an annular convex block is arranged on the outer wall of the main valve piston, and a slurry pipeline is radially formed in the annular convex block.
The manual blowout valve assembly comprises a ball valve, components connected with two ends of the ball valve are the same in connection mode, one end of the ball valve is sequentially connected with an inner joint and a connecting pipe, the connecting pipe is connected with a joint component, and a connecting pipe nut is sleeved at the joint of the inner joint and the connecting pipe;
the joint assembly comprises a joint seat and a joint bolt, the joint seat is of a hollow drum-shaped structure, openings are formed in two ends and side walls of the joint seat, a connecting pipe is inserted into the opening in the side wall of the joint seat and fixedly connected with the joint seat, the joint bolt penetrates through the openings in the two ends of the joint seat along the vertical direction, one end, penetrating out of the opening, of the joint bolt is connected with a connecting seat, an inner threaded hole matched with the joint bolt is formed in one end part of the connecting seat, a connecting seat flow passage is formed in the other end part of the connecting seat along the axial direction, and the connecting seat flow passage is communicated with the inner threaded hole and communicated with the joint bolt flow passage;
joint bolt flow passages are arranged at the centers of the joint bolts and the middle sections at intervals of 90 degrees in the circumferential direction;
the side wall of the main valve body is provided with two same main valve stepped holes, the connecting seat is inserted into the outward section of the main valve stepped hole and is fixedly connected with the main valve body, and the inward section of the main valve stepped hole is communicated with the slurry flowing space.
The control valve assembly comprises a control valve body, the control valve body comprises a left valve body, one side of the left valve body is connected with a right cylinder, the left valve body is of a square shell structure, a left valve body stepped hole is formed in the left valve body in the axial direction, and a control valve piston assembly is installed in the left valve body stepped hole;
the right cylinder is of a cylindrical structure, and the outer wall of the right cylinder is inserted into the valve body of the main valve and fixedly connected with the valve body of the main valve; the outer wall of the right cylinder is axially provided with a side wall flow passage which is communicated with the stepped hole of the left valve body; a fixed groove is formed in the bottom surface of the inner part of the right cylinder, and a right cylinder flow passage is formed in the bottom surface of the fixed groove and communicated with the stepped hole of the left valve body;
two sections of joint surfaces of the left valve body stepped hole are provided with taper holes.
The control valve piston assembly comprises a control valve piston, the control valve piston is of a three-section structure, a cylindrical piston rod and a conical valve are sequentially arranged from one end to the other end of the control valve piston, a spring groove is formed in the top end of the cylindrical piston, and a valve rubber is arranged on a conical valve sleeve;
one end of a control valve spring is fixed in a spring groove at the top end of the cylindrical piston, a spring gland is fixedly connected to the other end of the control valve spring, a limiting groove is formed in the lower bottom surface of the spring gland, the other end of the control valve spring is fixed in the limiting groove, a lead screw channel is axially formed in the spring gland, a lead screw is inserted into the lead screw channel, a control valve cover is sleeved on the lead screw, the control valve cover is of a stepped disc structure, the middle of the control valve cover is a square disc, an upper cylindrical boss and a lower cylindrical boss are respectively arranged on the two bottom surfaces of the square disc, the lower cylindrical boss is fixedly connected to the inner wall of a stepped hole of the left valve body, a nut is arranged in the upper cylindrical boss, and the nut is sleeved on the outer wall of the lead screw;
the lead screw is of a three-section structure, the lead screw is sequentially provided with a nut column, a hand wheel column and a lead screw column from one end to the other end, the outer wall of the nut column is sleeved with a nut, the outer wall of the hand wheel column is sleeved with a hand wheel, and the lead screw column sequentially penetrates through a control valve cover and a spring gland;
the screw rod column is provided with a circular bead, and the bottom surface inside the upper cylindrical boss is provided with a circular groove matched with the circular bead.
The center of the screw rod is provided with a through hole along the axial direction.
Four internal splines are uniformly arranged in the stepped hole of the left valve body at intervals of 90 degrees, and external splines matched with the internal splines are arranged on the side wall of the spring gland.
The lower part of the hand wheel is provided with a pointer, the outer wall of the valve cover of the control valve is provided with a dial, and the angular displacement information of the lead screw can be obtained through the pointer and the dial.
The invention has the beneficial effects that: when the working pressure of the drilling pump rises, the device realizes slurry blowout through the cooperative action of the control valve piston and the main valve piston, when the working pressure of the drilling pump is reduced, the control valve piston and the main valve piston automatically reset under the action of the spring, the device recovers to a normal working state, the pump does not need to be stopped and the shear pin does not need to be replaced in the working process, the use and maintenance cost and the labor intensity of field operation workers are reduced, and the drilling operation efficiency is improved. The control valve spring with lower rigidity is adopted to adjust the open-flow pressure of the device, stepless and accurate adjustment of the open-flow pressure can be realized, the open-flow precision of the device is improved, and the angular displacement information of the lead screw can be acquired through the pointer and the dial, so that the open-flow pressure adjusting process is more visual, convenient and accurate. Through set up manual blow-off valve assembly in the device, can realize the pressure release of drilling pump and mud short time empty cycle function, replace the pressure release bypass on the blow-off pipeline, simplify the structure of pipeline, reduced the cost of manufacture of pipeline.
Drawings
FIG. 1 is a schematic structural diagram of a reset type slurry blowout device for a drilling pump according to the invention;
FIG. 2 is a schematic structural diagram of a main valve assembly of a reset type slurry blowout device for a drilling pump according to the invention;
FIG. 3 is a cross-sectional view of the main valve body of the reset type mud blowout device for a drilling pump according to the present invention;
FIG. 4 is a schematic structural diagram of a main valve body of a reset type slurry blowout device for a drilling pump, which is disclosed by the invention;
FIG. 5 is a schematic diagram of a main valve piston assembly of the reset type mud blowout device for the drilling pump according to the present invention;
FIG. 6 is a cross-sectional view of the main valve piston of the reset mud blowout apparatus for a drilling pump of the present invention;
FIG. 7 is a cross-sectional view of a manual blow-off valve assembly of a reset mud blow-off device for a drilling pump according to the present invention;
FIG. 8 is an exploded view of a manual blow-off valve assembly of the reset mud blow-off device for a drilling pump of the present invention;
FIG. 9 is a cross-sectional view of a control valve body of a reset mud blowout apparatus for a drilling pump according to the present invention;
FIG. 10 is a schematic structural diagram of a control valve body of a reset type mud blowout device for a drilling pump, which is disclosed by the invention;
FIG. 11 is a cross-sectional view of a control valve piston assembly of the reset mud blowout apparatus for a drilling pump of the present invention;
FIG. 12 is a schematic illustration of a control valve piston assembly of a reset mud blowout apparatus for a drilling pump according to the present invention;
FIG. 13 is a cross-sectional view of a lead screw of a reset mud blowout apparatus for a drilling pump of the present invention;
FIG. 14 is a schematic structural view of a lead screw of a reset type mud blowout device for a drilling pump according to the invention;
FIG. 15 is a cross-sectional view of a control valve cover of a reset mud blowout apparatus for a drilling pump according to the present invention;
FIG. 16 is a schematic structural diagram of a control valve cover of a reset type mud blowout device for a drilling pump, which is disclosed by the invention;
FIG. 17 is a schematic structural view of a control valve assembly of a reset mud blowout apparatus for a drilling pump according to the present invention;
FIG. 18 is a schematic view of the pointer mounting of the reset mud blowout apparatus for a drilling pump of the present invention;
FIG. 19 is a schematic view of the dial mounting of the reset mud blowout apparatus of the present invention for a drilling pump;
FIG. 20 is a schematic illustration of the reset mud blowout apparatus for a drilling pump of the present invention during normal operation;
FIG. 21 is a mud blowout of the reset mud blowout apparatus for a drilling pump of the present invention;
FIG. 22 is a manual blowout of a reset mud blowout apparatus for a drilling pump of the present invention.
In the drawings, 1 main valve assembly, 2 control valve assembly, 3 manual blow-off valve assembly, 4 outlet flange, 5 inlet flange, 6 connecting flange, 7 pointer, 8 dial, 1-1 main valve body, 1-1-1 piston channel, 1-1-2 mud outflow channel, 1-3 mud flow space, 1-1-3 main valve stepped hole, 1-2 main valve piston component, 1-2-1 main valve piston, 1-2-2 main valve spring channel, 1-2-3 main valve spring, 1-2-4 annular lug, 3-1 ball valve, 3-2 nipple, 3-3 nipple, 3-4 nipple nut, 3-5 nipple component, 3-5-1 joint bolt, 3-5-2 joint seat, 3-5-3 connecting seat, 3-5-4 joint bolt runner, 2 control valve assembly, 2-1 control valve body, 2-1-1 left valve body, 2-1-2 right cylinder, 2-1-3 left valve body stepped hole, 2-2 control valve piston assembly, 2-2-1 control valve piston, 2-2-2 cylindrical piston, 2-2-3 conical valve, 2-2-4 valve rubber, 2-2-5 control valve spring, 2-2-6 spring gland, 2-2-7 lead screw, 2-2-8 control valve cover, 2-2-9 parts of an upper cylindrical boss, 2-2-10 parts of a lower cylindrical boss, 2-2-11 parts of a nut, 2-2-7-1 parts of a nut column, 2-2-7-2 parts of a hand wheel column, 2-2-7-3 parts of a screw rod column, 2-2-7-4 parts of a hand wheel and 2-2-7-5 parts of a shoulder.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The utility model provides a reset formula mud blowout device for drilling pump, the structure is shown in figure 1, including main valve assembly 1, the outer wall of main valve assembly 1 is provided with manual blowout valve assembly 3, and main valve assembly 1 one end is connected with control valve assembly 2, and other end connection has outlet flange 4, and the outer wall of main valve assembly 1 is connected with flange 6, and flange 6 is connected with entry flange 5.
The structure of the main valve assembly 1 is shown in fig. 2, and comprises a main valve body 1-1, the structure is shown in fig. 3 and 4, the main valve body 1-1 is a hollow shell structure, one end of the main valve body 1-1 is axially provided with a cylindrical main valve piston channel 1-1-1, and a main valve piston component 1-2 is arranged in the main valve piston channel 1-1-1; the other end of the main valve body 1-1 is axially provided with a slurry outflow channel 1-1-2, the side wall of the main valve body 1-1 is radially provided with a slurry inlet channel, and a main valve piston channel 1-1-1, the slurry outflow channel 1-1-2 and the slurry inlet channel are communicated with each other to form a slurry flow space 1-3;
the lower part of the main valve assembly 1 is connected with a drilling pump through an inlet flange 5, the right end of the main valve assembly is connected with a blowout pipeline through an outlet flange, and slurry enters a main valve body 1-1 of the main valve assembly from the drilling pump and flows to a channel of the blowout pipeline through an outlet flange 4.
The main valve piston passage 1-1-1 of the main valve body 1-1 is a cylindrical passage which is matched with the main valve piston 1-2-1 and is a passage through which the main valve piston 1-2-1 reciprocates. The joint surface of the main valve piston channel 1-1-1 and the mud outflow channel 1-1-2 is provided with an annular groove which is matched with the circular arc structure at the end part of the right section of the main valve piston 1-2-1 to play a role in sealing mud.
The main valve spring channel 1-2-2 is matched with the right cylinder 2-1-2 of the control valve body 2-1, and plays a role in supporting and guiding the main valve piston 1-2-1 to reciprocate in the main valve body 1-1. The middle section and the right section of the main valve piston 1-2-1 are both cylindrical structures, the middle section is matched with the inner cavity of the main valve body 1-1 to realize the reciprocating movement of the piston, and the circular arc structure at the end part of the right section of the main valve piston 1-2-1 is matched with the annular groove at the right end of the main valve body 1-1 to realize the function of sealing slurry. The lower part of the middle section of the main valve piston 1-2-1 is provided with a slurry channel which is a channel for slurry to enter the control valve assembly 2 from the main valve assembly 1. The center of the main valve piston 1-2-1 is provided with a communicated slurry flow channel for realizing the communication between the inside of the control valve assembly 2 and a blowout pipeline.
The left end of the main valve body 1-1 and the control valve assembly 2, the lower part of the main valve body 1-1 and the connecting flange 6, and the joint of the right end of the main valve body 1-1 and the outlet flange 4 are all provided with screw holes for connection and sealing grooves for installing sealing rings, the screw holes are fixed by screws and nuts, and the sealing grooves are provided with sealing rings. The connecting flange 6 and the inlet flange 5 are fixed by adopting a stud bolt.
The side wall of the main valve body 1-1 is provided with two same main valve stepped holes 1-1-3, the upper sections of the main valve stepped holes 1-1-3 are provided with threads for mounting a manual blowout valve assembly 3, the lower sections of the main valve stepped holes are provided with unthreaded holes, and the unthreaded holes are communicated with a slurry flowing space 1-3 in the center of the main valve body 1-1.
The manual blow-off valve assembly 3 is structurally shown in figure 7 and comprises a ball valve 3-1, components connected with two ends of the ball valve 3-1 are connected in the same mode, one end of the ball valve 3-1 is sequentially connected with an inner connector 3-2 and a connecting pipe 3-3, the connecting pipe 3-3 is connected with a connector assembly 3-5, and a connecting pipe nut 3-4 is sleeved at the connecting part of the inner connector 3-2 and the connecting pipe 3-3;
the structure of the joint component 3-5 is shown in figure 8, which comprises a joint seat 3-5-2 and a joint bolt 3-5-1, wherein the joint seat 3-5-2 is a hollow drum-shaped structure, openings are arranged at both ends and side walls of the joint seat 3-5-2, a connecting pipe 3-3 is inserted into the opening of the side wall of the joint seat 3-5-2 and fixedly connected with the joint seat 3-5-2, the joint bolt 3-5-1 penetrates through the openings at both ends of the joint seat 3-5-2 along the vertical direction, one end of the joint bolt 3-5-1 penetrating through the opening is connected with the joint seat 3-5-3, one end of the joint seat 3-5-3 is provided with an inner screw hole matched with the joint bolt 3-5-1, the other end of the joint seat 3-5-3 is provided with a joint seat flow passage along the axial direction, the connecting seat runner is communicated with the inner screw hole and is communicated with the joint bolt runner 3-5-4;
the center of the joint bolt 3-5-1 and the middle section are provided with joint bolt runners 3-5-4 at intervals of 90 degrees in the circumferential direction, and the joint bolt runners play a role in connection and can provide channels for slurry flow in work.
The connecting seat 3-5-3 is connected to the upper part of the main valve assembly 1, and communicates the interior of the main valve body 1-1 with the blowout pipeline, so that the function of manually controlling the opening and closing of the slurry blowout device is realized.
The connecting seat 3-5-3 is inserted into the outward section of the main valve stepped hole 1-1-3 and is fixedly connected with the main valve body 1-1, and the inward section of the main valve stepped hole 1-1-3 is communicated with the slurry flowing space 1-3.
The structure of the control valve assembly 2 is shown in figure 17, the control valve assembly comprises a control valve body 2-1, the structure is shown in figures 9 and 10, the control valve body 2-1 comprises a left valve body 2-1-1, one side of the left valve body 2-1-1 is connected with a right cylinder 2-1-2, the left valve body 2-1-1 is of a square shell structure, a left valve body stepped hole 2-1-3 is formed in the left valve body 2-1-1 along the axial direction, and a control valve piston assembly 2-2 is installed in the left valve body stepped hole 2-1-3;
the right cylinder 2-1-2 is a cylindrical structure, and the outer wall of the right cylinder 2-1-2 is inserted into the main valve body 1-1 and fixedly connected; the outer wall of the right cylinder 2-1-2 is provided with a side wall flow passage along the axial direction, and the side wall flow passage is communicated with the stepped hole 2-1-3 of the left valve body; a fixed groove is formed in the bottom surface of the inner part of the right cylinder 2-1-2, and a right cylinder flow passage communicated with the stepped hole 2-1-3 of the left valve body is formed in the bottom surface of the fixed groove;
two sections of joint surfaces of the left valve body stepped hole 2-1-3 are provided with taper holes.
The control valve piston assembly 2-2 is shown in figures 11 and 12 and comprises a control valve piston 2-2-1, the control valve piston 2-2-1 is of a three-section structure, a cylindrical piston 2-2, a cylindrical piston rod and a conical valve 2-2-3 are sequentially arranged from one end to the other end of the control valve piston 2-2-1, a spring groove is formed in the top end of the cylindrical piston 2-2-2, and the conical valve 2-2-3 is sleeved with a valve rubber 2-2-4;
one end of a control valve spring 2-2-5 is fixed in a spring groove at the top end of a cylindrical piston 2-2-2, the other end of the control valve spring 2-2-5 is fixedly connected with a spring gland 2-2-6, a limiting groove is arranged on the lower bottom surface of the spring gland 2-2-6, the other end of the control valve spring 2-2-5 is fixed in the limiting groove, a screw rod channel is axially arranged on the spring gland 2-2-6, a screw rod 2-2-7 is inserted in the screw rod channel, a control valve cover 2-2-8 is sleeved on the screw rod 2-2-7, the control valve cover 2-2-8 is of a stepped disc structure, the middle part of the control valve cover 2-2-8 is a square disc, an upper cylindrical boss 2-2-9 and a lower cylindrical boss 2-2-2-10 are respectively arranged on the two bottom surfaces of the square disc, the lower cylindrical boss 2-2-10 is fixedly connected to the inner wall of the stepped hole 2-1-3 of the left valve body, the nut 2-2-11 is arranged in the upper cylindrical boss 2-2-9, and the nut 2-2-11 is sleeved on the outer wall of the screw rod 2-2-7;
the screw rod 2-2-7 is of a three-section structure as shown in figures 13 and 14, the screw rod 2-2-7 is sequentially provided with a nut column 2-2-7-1, a hand wheel column 2-2-7-2 and a screw rod column 2-2-7-3 from one end to the other end, the outer wall of the nut column 2-2-7-1 is sleeved with a nut, the outer wall of the hand wheel column 2-2-7-2 is sleeved with a hand wheel 2-2-7-4, and the screw rod column 2-2-7-3 sequentially penetrates through a control valve cover 2-2-8 and a spring gland 2-2-6;
the screw rod column 2-2-7-3 is provided with a shoulder 2-2-7-5, and the inner bottom surface of the upper cylindrical boss 2-2-9 is provided with a circular groove matched with the shoulder 2-2-7-5.
As shown in fig. 18 and 19, a pointer 7 is arranged at the lower part of the hand wheel, a dial 8 is arranged on the outer wall of the valve cover of the control valve, and angular displacement information of the lead screw can be acquired through the pointer 7 and the dial 8, so that the moving amount of the spring gland, namely the compression amount of the spring of the control valve, can be calculated.
The main function of the control valve assembly 2 is to set the blowout pressure of the slurry blowout device through a hand wheel 2-2-7-4 and a screw rod 2-2-7, and to control the opening and closing of a main valve piston 1-2-1 through the action of the control valve piston 2-2-1. The upper section of the stepped hole 2-1-3 of the left valve body is used for installing a spring gland 2-2-6 and a control valve piston 2-2-1 and providing a channel for the control valve piston 2-2-1 to reciprocate up and down. Four internal splines are uniformly arranged in the left valve body stepped hole 2-1-3 at intervals of 90 degrees, and the side wall of the spring gland 2-2-6 is provided with external splines matched with the internal splines, so that the circumferential positioning of the spring gland is realized, and the vertical free movement of the spring gland can be ensured.
The lower section of the left valve body stepped hole 2-1-3 is a slurry flow channel which is communicated with a side wall flow channel arranged on the control valve body 2-1. The joint surface of the upper section and the lower section of the stepped hole 2-1-3 of the left valve body is provided with a taper hole, and the taper hole is matched with the lower section taper valve of the control valve piston 2-2-1, so that the function of sealing slurry is realized. The right cylinder 2-1-2 is matched with the inner cavity of the main valve body 1-1, and the inner wall of the right cylinder 2-1-2 is matched with the left section of the main valve piston 1-2-1, so that the main valve piston 1-2-1 can be supported and guided. The fixing groove arranged in the right cylinder 2-1-2 is used for installing and positioning the main valve spring 1-2-3, and the shoulder formed between the fixing groove and the inner wall is used for limiting the main valve piston 1-2-1 when moving leftwards. The middle part of the control valve body 2-1 is provided with a right cylinder flow passage for communicating the left half part and the right half part.
The control valve piston 2-2-1 is divided into an upper section, a middle section and a lower section. The upper section of the piston is in a cylindrical piston structure, is matched with the valve body of the control valve and plays a role in supporting and guiding the control valve piston 2-2-1 to reciprocate up and down. The upper section of the control valve piston 2-2-1 is provided with a spring groove for mounting and positioning the control valve spring 2-2-5, and the middle part of the piston is provided with a sealing groove for mounting a sealing ring. The lower section of the piston is of a conical valve structure, a valve rubber sheet 2-2-4 is arranged on the conical valve, the function of sealing slurry is realized by matching the conical valve, the valve rubber sheet and a conical shoulder arranged on a valve body of the control valve, and the middle section of the piston is a cylindrical piston rod.
The nut column 2-2-7-1 is a cylindrical structure and is provided with threads matched with a nut, and the hand wheel 2-2-7-4 is connected to the screw rod 2-2-7 through the nut. The hand wheel column 2-2-7-2 is of a quadrangular prism structure, and the hand wheel column 2-2-7-2 is matched with an inner square hole arranged in the center of the hand wheel 2-2-7-4, so that circumferential positioning between the hand wheel 2-2-7-4 and the screw rod 2-2-7 is realized. The screw rod column 2-2-7-3 is of a cylindrical structure and is matched with a through hole arranged in the center of the nut 2-2-11. The shoulder 2-2-7-5 is of a disc structure with a slightly larger diameter, the shoulder 2-2-7-5 is matched with a circular groove arranged on the upper cylindrical boss 2-2-9, and the screw rod 2-2-7 is connected with the control valve cover 2-2-8 through the nut 2-2-11, so that circumferential and axial positioning of the screw rod 2-2-7 can be realized, and free rotation of the screw rod 2-2-7 relative to the control valve cover 2-2-8 can be guaranteed. The lower section of the screw rod column 2-2-7-3 is provided with external threads, the threads are matched with an internal thread hole arranged at the center of the spring gland 2-2-6, and the spring gland 2-2-6 can move up and down through the rotation of the screw rod 2-2-7. The center of the screw rod 2-2-7 is provided with a through hole for filling lubricating oil into the control valve periodically to prevent the control valve piston from being corroded and stuck.
The structure of the control valve cover 2-2-8 is shown in figures 15 and 16, an internal thread hole and a circular groove are arranged in the center of an upper cylindrical boss 2-2-9, the circular groove is matched with a shoulder arranged on a lead screw 2-2-7, the internal thread hole is matched with an external thread on a nut 2-2-11, and the upper cylindrical boss 2-2-9 is mainly used for installing and positioning the lead screw 2-2-7. The middle section of the control valve cover 2-2-8 is of a square structure, and the connection between the control valve cover 2-2-8 and the control valve body 2-1 is realized through counter bores and screws arranged on the periphery. The lower cylindrical boss 2-2-10 is matched with the inner cavity of the control valve body 2-1, so that the limit of the spring gland 2-2-6 during upward movement is realized.
The working principle of the reset type slurry open-flow device for the drilling pump is as follows:
the operation of the present invention when setting the open-flow pressure is shown in fig. 18 and 19. The blowout pressure adjusting mechanism mainly comprises a pointer 7, a dial 8, a hand wheel 2-2-7-4, a lead screw 2-2-7, a control valve spring 2-2-5, a spring gland 2-2-6 and the like. The dial 8 is a fixed part and is arranged on the outer wall of the valve cover 2-2-8 of the control valve. The pointer 7 is arranged on the lower end face of the hand wheel 2-2-7-4 and synchronously rotates with the hand wheel 2-2-7-4, and the angular displacement information of the hand wheel 2-2-7-4 can be acquired through the pointer 7 and the dial 8. In the initial state, the spring gland 2-2-6 is in contact with the lower cylindrical boss 2-2-10, the position is the initial position of the hand wheel 2-2-7-4, and the control valve spring 2-2-5 is in the original length. Clockwise rotation of the hand wheel 2-2-7-4, the hand wheel 2-2-7-4 drives the pointer 7 to synchronously rotate, a thread pair is arranged between the screw rod 2-2-7 and the spring gland 2-2-6, the spring gland 2-2-6 moves downwards under the action of the screw rod 2-2-7, the spring gland 2-2-6 compresses the control valve spring 2-2-5, the acting force of the control valve spring 2-2-5 acting on the control valve piston 2-2-1 is increased, the stress surface of the control valve piston 2-2-1 is constant, according to the force balance principle, in this case, the mud pressure required for pushing the control valve piston 2-2-1 open is correspondingly increased, so that the relief pressure value of the heightening device is realized. When the pressure value of the blowout of the device needs to be reduced, the hand wheel 2-2-7-4 only needs to be rotated reversely. In the process of rotating the hand wheel 2-2-7-4, the angular displacement information of the hand wheel 2-2-7-4 can be obtained through the pointer 7 and the dial 8, and then the movement amount of the spring gland 2-2-6, namely the compression amount of the control valve spring 2-2-5 relative to the initial position, is obtained through calculation by utilizing the parameters of the lead screw 2-2-7, so that the open-flow pressure adjusting process is visual, convenient and accurate.
The principle of the invention when working normally is shown in fig. 20. The space between the right end face of the shoulder on the main valve piston 1-2-1 and the inlet flange 5 is denoted as region i, the space between the left end face of the shoulder on the main valve piston 1-2-1 and the main valve cavity is denoted as region ii, and the space formed between the left section of the main valve piston 1-2-1 and the right half of the control valve body is denoted as region iii. The blow-off pressure value of the device was first set as shown in fig. 18 and 19. As the side wall flow channels are arranged at the lower parts of the main valve piston 1-2-1 and the control valve body, slurry can fill the area I and the area II through the inlet flange 5 after the drilling pump works normally. When the working pressure of the drilling pump is smaller than the set blowout pressure of the device, the acting force of the mud in the area II on the lower section end face of the control valve piston 2-2-1 is smaller than the acting force of the control valve spring 2-2-5 on the control valve piston 2-2-1, so that the control valve piston is in a closed state. At this time, because the mud pressure in the area I and the area II is equal, and the action areas of the mud on the left end surface and the right end surface of the shoulder of the main valve piston 1-2-1 are equal, the main valve piston 1-2-1 is balanced by the action force of the mud, the main valve piston 1-2-1 moves rightwards under the action of the main valve spring 1-2-3, the circular arc-shaped boss at the right end of the main valve piston 1-2-1 is embedded in the annular groove on the main valve body 1-1, and the main valve piston 1-2-1 is also in a closed state.
The principle of the slurry open-flow device of the invention when discharging slurry is shown in fig. 21. When the working pressure of the drilling pump is gradually increased until the working pressure exceeds the set blowout pressure of the device, the acting force of the mud in the area II on the end surface of the lower section of the control valve piston 2-2-1 is larger than the acting force of the control valve spring 2-2-5 on the control valve piston 2-2-1, so that the control valve piston 2-2-1 moves upwards under the action of the mud to be in an open state, and the mud enters the area III and enters a blowout pipeline through a flow channel arranged in the center of the main valve piston 1-2-1 through the outlet flange 4. At the moment, the mud pressure in the area II and the area III is zero, so that the acting force of the mud in the area II on the left end face of the shoulder of the main valve piston 1-2-1 is zero, the area I is filled with high-pressure mud, the acting force of the mud on the right end face of the shoulder of the main valve piston 1-2-1 is far larger than the acting force of the main valve spring 1-2-3 on the main valve piston 1-2-1, the main valve piston 1-2-1 moves to the left under the action of the mud and is in an open state, and the mud in the area I enters a blowout pipeline through the outlet flange 4 to realize blowout. When the working pressure of the drilling pump is reduced until the working pressure is lower than the set blowout pressure of the safety valve, the acting force of the mud in the area II on the lower section end face of the control valve piston 2-2-1 is smaller than the acting force of the control valve spring 2-2-5 on the control valve piston 2-2-1, so that the control valve piston 2-2-1 moves downwards under the action of the control valve spring 2-2-5 and is gradually closed. At this time, the acting force of the mud in the area II and the area I on the shoulder of the main valve piston 1-2-1 is balanced again, the main valve piston 1-2-1 moves rightwards under the action of the main valve spring 1-2-3 and is gradually closed, and the device is restored to a normal working state.
The principle of the slurry blowout device of the invention when manually blowing is shown in fig. 22. When the drilling pump needs to perform short-time empty circulation on the mud in the normal drilling operation process or when the drilling pump needs to be decompressed after the drilling operation is finished, the ball valve 3-1 is opened, the mud in the area II enters a blowout pipeline through the manual blowout valve assembly 3 arranged at the upper part of the main valve body 1-1 through the outlet flange 4, and the mud pressure in the area II is reduced to zero. High-pressure slurry in the area I pushes the main valve piston 1-2-1 to move leftwards, the main valve piston 1-2-1 is opened, and slurry in the drilling pump enters a blowout pipeline through an outlet flange, so that pressure relief of the drilling pump or short-time air circulation of the slurry is realized. When the normal operation of the device needs to be restored, the ball valve 3-1 is closed, the pressure of the mud in the area II is equal to that in the area I, the acting force of the mud on the main valve piston 1-2-1 is balanced, the main valve piston 1-2-1 moves rightwards under the action of the main valve spring 1-2-3 and is gradually closed, and the device restores the normal operation state. In the process, the working pressure of the drilling pump does not exceed the set blowout pressure of the device, so that the control valve piston 2-2-1 is always in a closed state.
The reset type slurry open flow device for the drilling pump has the advantages that: by integrating the main valve with the control valve, when the working pressure of the drilling pump exceeds the set pressure of the device, the control valve piston and the main valve piston act in succession to realize slurry blowout, and when the working pressure of the drilling pump is lower than the set blowout pressure of the device, the control valve piston and the main valve piston automatically reset in succession under the action of the spring. Because the control valve assembly is adopted to adjust the open-flow pressure, and the pressure of slurry acting on the control valve piston is smaller, the spring stiffness of the control valve is smaller, the accurate adjustment of the open-flow pressure can be realized, and the open-flow precision is high. The manual blowout valve assembly arranged on the upper part of the main valve body can realize the pressure relief function of the drilling pump, replaces a pressure relief bypass on a blowout pipeline, simplifies the pipeline structure and reduces the pipeline manufacturing cost.

Claims (6)

1. The reset type slurry blowout device for the drilling pump is characterized by comprising a main valve assembly (1), wherein a manual blowout valve assembly (3) is arranged on the outer wall of the main valve assembly (1), one end of the main valve assembly (1) is connected with a control valve assembly (2), the other end of the main valve assembly is connected with an outlet flange (4), the outer wall of the main valve assembly (1) is connected with a connecting flange (6), and the connecting flange (6) is connected with an inlet flange (5);
the main valve assembly (1) comprises a main valve body (1-1), the main valve body (1-1) is of a hollow shell structure, one end of the main valve body (1-1) is axially provided with a cylindrical main valve piston channel (1-1-1), and a main valve piston assembly (1-2) is installed in the main valve piston channel (1-1-1); the other end of the main valve body (1-1) is axially provided with a slurry outflow channel (1-1-2), the side wall of the main valve body (1-1) is radially provided with a slurry inlet channel, and the main valve piston channel (1-1-1), the slurry outflow channel (1-1-2) and the slurry inlet channel are communicated with each other to form a slurry flowing space (1-3);
the outer wall of the main valve body (1-1) is connected with a manual blowout valve assembly (3), one end of the main valve body (1-1) is connected with a control valve assembly (2), the end part of the other end of the main valve body is connected with an outlet flange (4), the outer wall of the main valve body (1-1) is connected with a connecting flange (6), and the connecting flange (6) is connected with an inlet flange (5);
the joint surface of the main valve piston channel (1-1-1) and the slurry outflow channel (1-1-2) is provided with an annular groove;
the manual blowout valve assembly (3) comprises a ball valve (3-1), components connected with two ends of the ball valve (3-1) are identical in connection mode, one end of the ball valve (3-1) is sequentially connected with an inner connector (3-2) and a connecting pipe (3-3), the connecting pipe (3-3) is connected with a connector assembly (3-5), and a connecting pipe nut (3-4) is sleeved at the joint of the inner connector (3-2) and the connecting pipe (3-3);
the joint component (3-5) comprises a joint seat (3-5-2) and a joint bolt (3-5-1), the joint seat (3-5-2) is of a hollow drum-shaped structure, openings are formed in both ends and side walls of the joint seat (3-5-2), the connecting pipe (3-3) is inserted into the opening in the side wall of the joint seat (3-5-2) and fixedly connected with the joint seat (3-5-2), the joint bolt (3-5-1) penetrates through the openings in both ends of the joint seat (3-5-2) along the vertical direction, one end, penetrating through the opening, of the joint bolt (3-5-1) is connected with the joint seat (3-5-3), an inner threaded hole matched with the joint bolt (3-5-1) is formed in one end of the joint seat (3-5-3), a connecting seat flow passage is axially arranged at the end part of the other end of the connecting seat (3-5-3), and the connecting seat flow passage is communicated with the inner screw hole and is communicated with the joint bolt flow passage (3-5-4);
joint bolt runners (3-5-4) are arranged at the centers of the joint bolts (3-5-1) and the middle sections at intervals of 90 degrees in the circumferential direction;
the side wall of the main valve body (1-1) is provided with two same main valve stepped holes (1-1-3), the connecting seat (3-5-3) is inserted into the outward section of the main valve stepped hole (1-1-3) and is fixedly connected with the main valve body (1-1), and the inward section of the main valve stepped hole (1-1-3) is communicated with the slurry flowing space (1-3);
the control valve assembly (2) comprises a control valve body (2-1), the control valve body (2-1) comprises a left valve body (2-1-1), one side of the left valve body (2-1-1) is connected with a right cylinder (2-1-2), the left valve body (2-1-1) is of a square shell structure, a left valve body stepped hole (2-1-3) is formed in the left valve body (2-1-1) in the axial direction, and a control valve piston assembly (2-2) is installed in the left valve body stepped hole (2-1-3);
the right cylinder (2-1-2) is of a cylindrical structure, and the outer wall of the right cylinder (2-1-2) is inserted into a main valve body (1-1) and fixedly connected with the main valve body; the outer wall of the right cylinder (2-1-2) is provided with a side wall flow channel along the axial direction, and the side wall flow channel is communicated with the left valve body stepped hole (2-1-3); a fixed groove is formed in the bottom surface of the inner part of the right cylinder (2-1-2), and a right cylinder flow passage is formed in the bottom surface of the fixed groove and communicated with the stepped hole (2-1-3) of the left valve body;
taper holes are arranged at the joint surfaces of the two end sections of the left valve body stepped hole (2-1-3).
2. The reset type slurry blowout device for the drilling pump according to claim 1, wherein the main valve piston assembly (1-2) comprises a main valve piston (1-2-1), the main valve piston (1-2-1) has a stepped structure, a main valve spring passage (1-2-2) is axially formed at one end of the main valve piston (1-2-1), a main valve spring (1-2-3) is installed in the main valve spring passage (1-2-2), a slurry flow passage is axially formed at the other end of the main valve piston (1-2-1), the slurry flow passage is communicated with the main valve spring passage (1-2-2), an annular bump (1-2-4) is arranged on the outer wall of the main valve piston (1-2-1), the annular convex blocks (1-2-4) are provided with slurry pipelines along the radial direction.
3. The reset type mud blowout device for the drilling pump according to claim 1, wherein the control valve piston assembly (2-2) comprises a control valve piston (2-2-1), the control valve piston (2-2-1) is of a three-section structure, a cylindrical piston (2-2-2), a cylindrical piston rod and a conical valve (2-2-3) are sequentially arranged from one end to the other end of the control valve piston (2-2-1), a spring groove is formed in the top end of the cylindrical piston (2-2-2), and a rubber valve (2-2-4) is sleeved on the conical valve (2-2-3);
one end of a control valve spring (2-2-5) is fixed in a spring groove at the top end of the cylindrical piston (2-2-2), a spring gland (2-2-6) is fixedly connected to the other end of the control valve spring (2-2-5), a limiting groove is formed in the lower bottom surface of the spring gland (2-2-6), the other end of the control valve spring (2-2-5) is fixed in the limiting groove, a lead screw channel is axially formed in the spring gland (2-2-6), a lead screw (2-2-7) is inserted in the lead screw channel, a control valve cover (2-2-8) is sleeved on the lead screw (2-2-7), the control valve cover (2-2-8) is of a stepped disc structure, and the middle part of the control valve cover (2-2-8) is of a square disc, an upper cylindrical boss (2-2-9) and a lower cylindrical boss (2-2-10) are respectively arranged on two bottom surfaces of the square disc, the lower cylindrical boss (2-2-10) is fixedly connected to the inner wall of the stepped hole (2-1-3) of the left valve body, a nut (2-2-11) is arranged in the upper cylindrical boss (2-2-9), and the nut (2-2-11) is sleeved on the outer wall of the screw rod (2-2-7);
the lead screw (2-2-7) is of a three-section structure, the lead screw (2-2-7) is sequentially provided with a nut column (2-2-7-1), a hand wheel column (2-2-7-2) and a lead screw column (2-2-7-3) from one end to the other end, the outer wall of the nut column (2-2-7-1) is sleeved with a screw cap, the outer wall of the hand wheel column (2-2-7-2) is sleeved with a hand wheel (2-2-7-4), and the lead screw column (2-2-7-3) sequentially penetrates through a control valve cover (2-2-8) and a spring gland (2-2-6);
a shoulder (2-2-7-5) is arranged on the screw rod column (2-2-7-3), and a circular groove matched with the shoulder (2-2-7-5) is arranged on the inner bottom surface of the upper cylindrical boss (2-2-9).
4. The reset type slurry blowout device for the drilling pump according to claim 3, wherein the center of the screw rod (2-2-7) is provided with a through hole along the axial direction.
5. The reset type slurry blowout device for the drilling pump according to claim 3, wherein four internal splines are uniformly arranged in the stepped hole (2-1-3) of the left valve body at intervals of 90 degrees, and external splines matched with the internal splines are arranged on the side wall of the spring gland (2-2-6).
6. The reset type slurry blowing device for the drilling pump according to claim 3, wherein a pointer (7) is arranged at the lower part of the hand wheel, a dial (8) is arranged on the outer wall of the valve cover of the control valve, and angular displacement information of the screw rod (2-2-7) is acquired through the pointer (7) and the dial (8).
CN202010887035.7A 2020-08-28 2020-08-28 Reset type slurry open flow device for drilling pump Active CN112096940B (en)

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CN202209458U (en) * 2011-09-23 2012-05-02 广东正力精密机械有限公司 Diaphragm type minimum pressure valve

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