CN111692388B - Electromagnetic valve and working method thereof - Google Patents

Electromagnetic valve and working method thereof Download PDF

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Publication number
CN111692388B
CN111692388B CN202010545831.2A CN202010545831A CN111692388B CN 111692388 B CN111692388 B CN 111692388B CN 202010545831 A CN202010545831 A CN 202010545831A CN 111692388 B CN111692388 B CN 111692388B
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China
Prior art keywords
hole
valve
communicated
port
sleeve
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CN202010545831.2A
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CN111692388A (en
Inventor
邵玉强
其他发明人请求不公开姓名
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Ningbo Casun Great Automation Industry Co ltd
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Individual
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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
    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • 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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0644—One-way valve
    • F16K31/0655—Lift valves
    • 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
    • F16K39/00—Devices for relieving the pressure on the sealing faces
    • F16K39/02—Devices for relieving the pressure on the sealing faces for lift valves
    • F16K39/024—Devices for relieving the pressure on the sealing faces for lift valves using an auxiliary valve on the main valve

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

The invention discloses a solenoid valve and a working method thereof, wherein the solenoid valve comprises a plug, a mounting hole is arranged in the plug, a valve sleeve is fixedly mounted at the lower end of the mounting hole, and a first valve hole and a second valve hole are arranged in the valve sleeve; the lower end of the second valve hole is a T-shaped hole, and a P-shaped hole is formed in the side surface of the valve sleeve; a threaded sleeve is fixedly installed at the upper end of the installation hole, a sliding sleeve is installed at the lower end of the threaded sleeve, and a valve core is connected in the first valve hole in a sliding manner; the upper end of the valve core is provided with a first convex shoulder which is connected in a sliding manner in the mounting hole, an upper control cavity and a lower control cavity are formed in the mounting hole, and a first spring is arranged in the upper control cavity; the upper end of the threaded sleeve is provided with a magnetic conduction pipe, an armature is arranged in the magnetic conduction pipe, the outer side of the magnetic conduction pipe is provided with a coil, and the lower end of the armature is provided with a valve rod; a second spring is arranged in the magnetic conduction pipe; a screw rod is connected with the inner thread of the plug; the electromagnetic valve is simple in structure and has the functions of conduction, cut-off and safety.

Description

Electromagnetic valve and working method thereof
Technical Field
The invention belongs to the technical field of electromagnetic valves, and particularly relates to an electromagnetic valve and a working method thereof.
Background
A solenoid valve is a known type of electronically operated valve. The solenoid valve is an industrial device controlled by electromagnetism, is an automatic basic element for controlling fluid, belongs to an actuator, and is not limited to hydraulic pressure and pneumatic pressure. Used in industrial control systems to regulate the direction, flow, velocity and other parameters of a medium. The solenoid valve can be matched with different circuits to realize expected control, and the control precision and flexibility can be ensured. There are many types of solenoid valves, with different solenoid valves functioning at different locations in the control system. The existing electromagnetic valve has a single function and does not have a safety protection function, and when the electromagnetic valve is actually used, a safety valve is usually connected to a pipeline where the electromagnetic valve is located, so that the use cost and the complexity of the pipeline are invisibly increased.
Disclosure of Invention
The invention aims to provide an electromagnetic valve and a working method thereof, which not only have simple structure, but also have the functions of conduction, cut-off and safety.
In order to achieve the purpose, the invention provides the following technical scheme:
a solenoid valve comprises a plug, wherein a mounting hole which penetrates through the plug up and down is formed in the plug, a valve sleeve is fixedly mounted at the lower end of the mounting hole, a first valve hole and a second valve hole are sequentially formed in the valve sleeve from top to bottom along the axial direction of the mounting hole, the upper end of the first valve hole is communicated with the mounting hole, the first valve hole and the second valve hole are communicated and coaxially arranged, the diameter of the mounting hole is larger than that of the first valve hole, and the diameter of the first valve hole is larger than that of the second valve hole; the lower end of the second valve hole is a T-shaped hole, and a P hole communicated with the first valve hole is formed in the side surface of the valve sleeve; a threaded sleeve is fixedly mounted at the upper end of the mounting hole, a sliding sleeve is fixedly mounted at the opening at the lower end of the threaded sleeve, the lower end of the sliding sleeve penetrates through the mounting hole and the first valve hole and extends into the second valve hole, a valve core sleeved on the sliding sleeve is connected in the first valve hole in a sliding manner, and the valve core is used for controlling the make-and-break of a P port and a T port; the outer side surface of the valve core, which is close to the upper end, is provided with a first convex shoulder which is connected in a sliding manner in the mounting hole along the radial direction, the mounting hole forms an upper control cavity between the screw sleeve and the first convex shoulder, a lower control cavity is formed between the first convex shoulder and the valve sleeve, and a first spring for forcing the first convex shoulder to move downwards is arranged in the upper control cavity; a magnetic conduction pipe is fixedly installed at an opening at the upper end of the screw sleeve, a plug is fixedly installed at the upper end of the magnetic conduction pipe, an armature is connected in the magnetic conduction pipe in a sliding mode, a coil is arranged on the outer side of the magnetic conduction pipe, and a valve rod extending into the sliding sleeve is arranged at the lower end of the armature; a second spring for forcing the armature to move upwards is arranged between the armature and the upper end of the sliding sleeve in the magnetic conduction pipe; a screw rod for controlling the moving distance of the armature is connected with the inner thread of the plug; when the coil is powered off, the armature iron moves upwards under the action of the second spring and props against the plug, and the lower control cavity is communicated with the T port; when the coil is electrified and the screw rod moves upwards to the first position, the armature moves downwards to compress the second spring, and the upper control cavity is completely closed; when the coil is electrified and the screw rod moves downwards to a second position, the armature moves downwards to compress the second spring, the upper control cavity is communicated with the T port, and the lower control cavity is communicated with the P port.
Furthermore, a sliding groove is formed in the armature close to the upper end of the armature in the axial direction of the armature, and a notch communicated with the sliding groove is formed in the upper end of the armature; a sliding hole with an opening at the lower end is formed in the plug, a plug body which is connected in the sliding hole in a sliding mode is arranged at the lower end of the screw rod, an adjusting rod which penetrates through the notch and extends into the sliding groove is arranged at the lower end of the plug body, and a second convex shoulder is arranged at the lower end of the adjusting rod along the radial direction; a clamp spring is arranged on the inner side wall of the sliding hole below the plug body, and when the screw rod moves upwards to the first position, the upper end of the plug body is abutted against the upper end of the sliding hole; when the screw rod moves downwards to the second position, the lower end of the plug body is abutted against the clamp spring.
Furthermore, a first through hole and a second through hole which are communicated with the upper control cavity and a third through hole which is communicated with the lower control cavity are arranged in the side wall of the sliding sleeve from top to bottom at intervals; a fourth through hole communicated with the T port is formed in the valve rod, and a first annular groove communicated with the third through hole is formed in the outer side face of the valve rod; the sliding sleeve is provided with a second ring groove on the outer side surface close to the lower end, a fifth through hole for communicating the P port with the second ring groove is formed in the valve core, and a sixth through hole for communicating the lower end of the second ring groove with an inner hole of the sliding sleeve is formed in the sliding sleeve; a third annular groove communicated with the third through hole is formed in the side wall of the inner hole, close to the upper end, of the valve core, and a seventh through hole used for communicating the third annular groove with the lower control cavity is formed in the valve core; a fourth ring groove is formed in the outer side of the valve rod above the first ring groove, and an eighth through hole used for communicating the fourth ring groove with the fourth through hole is formed in the valve rod;
when the coil is powered off, the fourth ring groove is communicated with the first through hole, and the first ring groove is communicated with the second through hole and disconnected with the sixth through hole; when the coil is electrified and the screw rod moves upwards to the first position, the fourth ring groove is disconnected with the first through hole, and the first ring groove is disconnected with the second through hole and the sixth through hole; when the coil is electrified and the screw rod moves downwards to the second position, the fourth annular groove is communicated with the second through hole, and the first annular groove is disconnected with the second through hole and communicated with the sixth through hole.
Furthermore, the outside of sliding sleeve is along radially being equipped with the chimb, first spring housing is in the outside of sliding sleeve and the upper end is contradicted on the chimb.
Furthermore, when the port P and the port T are disconnected, the lower end of the valve core is pressed at the opening at the upper end of the second valve hole, and when the port P and the port T are communicated, the lower end of the valve core is separated from the opening at the upper end of the second valve hole.
Furthermore, the plug is connected with a limit nut in a threaded manner, and the coil is located between the limit nut and the threaded sleeve.
The invention also provides a working method of the electromagnetic valve, when the electromagnetic valve plays a role of safety protection, the control coil is powered off, under the acting force of a second spring, the upper end of the armature abuts against the plug, at the moment, the lower control cavity is communicated with the T port through a seventh through hole, a third ring groove, a third through hole, a first ring groove, a second through hole, an upper control cavity, a first through hole, a fourth ring groove, an eighth through hole and a fourth through hole, at the moment, the pressure of the P port acts on the annular area of the valve core to generate upward thrust on the valve core, when the acting force generated by the pressure of the P port acting on the valve core is greater than the acting force of the first spring, the valve core moves upwards to communicate the P port with the T port to play a role of overflow protection, and the pressure of the P port cannot continuously rise; when the pressure of the port P is reduced, the valve core moves downwards to cut off the port P and the port T again under the action of the first spring;
when the electromagnetic valve plays a stop function, the control screw rod moves upwards to a first position, the upper end of the plug body is abutted against the upper end of the sliding hole, the coil is electrified, the armature moves downwards under the action of a coil magnetic field to compress the second spring, so that the upper control cavity is isolated from the port P and the port T, the upper control cavity is a closed containing cavity, a medium in the upper control cavity cannot flow out, the valve core cannot move upwards to open the second valve hole, and the valve core keeps at a position of isolating the port P from the port T no matter how high the pressure of the port P exists;
when the electromagnetic valve plays an unloading function, the control screw rod moves downwards to a second position, the lower end of the plug body is abutted to the clamp spring, the coil is electrified, the armature moves downwards under the action of a coil magnetic field to compress the second spring, the lower control cavity is communicated with the port P through the seventh through hole, the third annular groove, the third through hole, the first annular groove, the sixth through hole, the second annular groove and the fifth through hole, the upper control cavity is communicated with the port T through the second through hole, the fourth annular groove, the eighth through hole and the fourth through hole, the pressure of the port P acts on the annular area of the valve core and the first shoulder to jointly overcome the elastic force of the first spring, and the valve core can move upwards to open the valve port under small pressure of the port P to play an unloading function.
Advantageous effects
Compared with the prior art, the technical scheme of the invention has the following advantages:
(1) when the screw rod is adjusted upwards to the first position, the safety function and the stopping function can be realized through electric control; when the screw rod is adjusted downwards to the second position, the safety function and the unloading function can be realized through electric control; therefore, the function of the screw can be changed by changing the position of the screw, and compared with the prior art, the screw does not need to additionally increase a safety valve, so that the cost is saved, the pipeline is simplified, and multiple functions are realized;
(2) the invention has compact volume, simple structure and low manufacturing cost.
Drawings
FIG. 1 is a block diagram of the present invention, now in a secure functional state;
FIG. 2 is a block diagram of the present invention, now in the off state;
fig. 3 is a block diagram of the present invention, now in an unloaded state.
Detailed Description
Referring to fig. 1 to 3, a solenoid valve includes a plug 6, a mounting hole 6a penetrating up and down is formed in the plug 6, a valve sleeve 1 is fixedly mounted at the lower end of the mounting hole 6a, a first valve hole 1a and a second valve hole 1b are sequentially formed in the valve sleeve 1 from top to bottom along the axial direction of the mounting hole 6a, the upper end of the first valve hole 1a is communicated with the mounting hole 6a, the first valve hole 1a is communicated with the second valve hole 1b and coaxially disposed, a diameter D3 of the mounting hole 6a is larger than a diameter D1 of the first valve hole 1a, and a diameter D2 of the first valve hole 1a is larger than a diameter D2 of the second valve hole 1 b; the lower end of the second valve hole 1b is a T-shaped hole, and a P hole communicated with the first valve hole 1a is formed in the side surface of the valve sleeve 1; the upper end fixed mounting of mounting hole 6a has swivel nut 7, the lower extreme opening part fixed mounting of swivel nut 7 has the lower extreme to pass mounting hole 6a and first valve opening 1a and stretch into sliding sleeve 3 in the second valve opening 1b, sliding connection has case 2 of cup jointing on sliding sleeve 3 in first valve opening 1a, case 2 is used for controlling the break-make of P mouth and T mouth, and when P mouth and T mouth disconnection, the lower extreme of case 2 compresses tightly at the upper end opening part of second valve opening 1b, and when P mouth and T mouth intercommunication, the lower extreme of case 2 leaves the upper end opening part of second valve opening 1 b.
The outer side surface of the valve core 2 close to the upper end is provided with a first convex shoulder 21 which is connected in a sliding manner in a mounting hole 6a along the radial direction, the mounting hole 6a forms an upper control cavity 2b between the screw sleeve 7 and the first convex shoulder 21, a lower control cavity 2a is formed between the first convex shoulder 21 and the valve sleeve 1, a first spring 5 for forcing the first convex shoulder 21 to move downwards is arranged in the upper control cavity 2b, the outer side of the sliding sleeve 3 is provided with a convex edge 3a along the radial direction, the first spring 5 is sleeved on the outer side of the sliding sleeve 3, and the upper end of the first spring abuts against the convex edge 3 a; a magnetic conduction pipe 9 is fixedly installed at an opening at the upper end of the threaded sleeve 7, a plug 91 is fixedly installed at the upper end of the magnetic conduction pipe 9, an armature 4a is connected in the magnetic conduction pipe 9 in a sliding manner, a coil 10 is arranged on the outer side of the magnetic conduction pipe 9, a limit nut 10a is connected to the plug 91 in a threaded manner, and the coil 10 is located between the limit nut 10a and the threaded sleeve 7; the lower end of the armature iron 4a is provided with a valve rod 4 extending into the sliding sleeve 3; a second spring 8 for forcing the armature 4a to move upwards is arranged between the armature 4a and the upper end of the sliding sleeve 3 in the magnetic conduction pipe 9; a screw rod 11 for controlling the moving distance of the armature 4a is connected with the inner thread of the plug 91; when the coil 10 is powered off, the armature 4a moves upwards under the action of the second spring 8 and is propped against the plug 91, and the lower control cavity 2a is communicated with the T port; when the coil 10 is energized and the screw 11 moves upwards to the first position, the armature 4a moves downwards to compress the second spring 8, and the upper control chamber 2b is completely closed; when the coil 10 is energized and the screw 11 moves downward to the second position, the armature 4a moves downward compressing the second spring 8, the upper control chamber 2b communicates with the port T, and the lower control chamber 2a communicates with the port P.
A sliding groove 4b is formed in the armature iron 4a at a position close to the upper end along the axial direction of the armature iron, and a notch 4c communicated with the sliding groove 4b is formed in the upper end of the armature iron 4 a; a sliding hole 92 with an opening at the lower end is formed in the plug 91, a plug body 11a which is connected in the sliding hole 92 in a sliding manner is arranged at the lower end of the screw rod 11, an adjusting rod 11b which penetrates through the notch 4c and extends into the sliding groove 4b is arranged at the lower end of the plug body 11a, and a second shoulder 11c is arranged at the lower end of the adjusting rod 11b along the radial direction; a clamp spring 4d is arranged below the plug body 11a on the inner side wall of the sliding hole 92, and when the screw rod 11 moves upwards to the first position, the upper end of the plug body 11a is abutted against the upper end of the sliding hole 92; when the screw 11 moves downward to the second position, the lower end of the plug body 11a abuts against the snap spring 4 d.
A first through hole 32 and a second through hole 33 which are communicated with the upper control cavity 2b and a third through hole 34 which is communicated with the lower control cavity 2a are arranged in the side wall of the sliding sleeve 3 from top to bottom at intervals; a fourth through hole 41 communicated with the T port is formed in the valve rod 4, and a first annular groove 42 communicated with the third through hole 34 is formed in the outer side face of the valve rod 4; a second annular groove 31 is formed in the outer side surface, close to the lower end, of the sliding sleeve 3, a fifth through hole 21 for communicating the port P with the second annular groove 31 is formed in the valve core 2, and a sixth through hole 31a for communicating the lower end of the second annular groove 31 with an inner hole of the sliding sleeve 3 is formed in the sliding sleeve 3; a third annular groove 23 communicated with a third through hole 34 is formed in the side wall of an inner hole, close to the upper end, of the valve core 2, and a seventh through hole 22 for communicating the third annular groove 23 with the lower control cavity 2a is formed in the valve core 2; a fourth ring groove 42a is formed in the outer side of the valve rod 4 above the first ring groove 42, and an eighth through hole 43 for communicating the fourth ring groove 42a with the fourth through hole 41 is formed in the valve rod 4; when the coil 10 is deenergized, the fourth ring groove 42a communicates with the first through hole 32, the first ring groove 42 communicates with the second through hole 33, and is disconnected from the sixth through hole 31 a; when the coil 10 is energized and the screw 11 moves upward to the first position, the fourth ring groove 42a is disconnected from the first through hole 32, and the first ring groove 42 is disconnected from both the second through hole 33 and the sixth through hole 31 a; when the coil 10 is energized and the screw 11 moves downward to the second position, the fourth ring groove 42a communicates with the second through hole 33, and the first ring groove 42 is disconnected from the second through hole 33 and communicates with the sixth through hole 31 a.
The invention also provides a working method of the electromagnetic valve, when the electromagnetic valve plays a role of safety protection, the control coil 10 is powered off, under the action of the second spring 8, the upper end of the armature 4a is abutted against the plug 91, at the moment, the lower control cavity 2a is communicated with the T port through the seventh through hole 22, the third ring groove 23, the third through hole 34, the first ring groove 42, the second through hole 33, the upper control cavity 2b, the first through hole 32, the fourth ring groove 42a, the eighth through hole 43 and the fourth through hole 41, at the moment, the pressure of the P port acts on the annular area of the valve core 2 to generate upward thrust on the valve core 2, when the action force generated by the pressure of the P port acting on the valve core 2 is greater than the action force of the first spring 5, the valve core 2 moves upward to communicate the P port with the T port, so that the overflow protection effect is achieved, and the pressure of the P port does not continuously rise; when the pressure of the port P is reduced, the valve core 2 moves downwards to cut off the port P and the port T again under the action of the first spring 5.
When the electromagnetic valve plays a stopping function, the control screw rod 11 moves upwards to a first position, the upper end of the plug body 11a is abutted to the upper end of the sliding hole 92, the coil 10 is electrified, the armature 4a moves downwards under the action of a magnetic field of the coil 10 to compress the second spring 8, the upper control cavity 2b is isolated from the P port and the T port and is blocked, the upper control cavity 2b is a closed containing cavity at the moment, a medium in the upper control cavity 2b cannot flow out, the valve core 2 cannot move upwards to open the second valve hole 1b, and the valve core 2 is kept at a position for isolating the P port from the T port no matter how large the pressure of the P port is at the moment.
When the electromagnetic valve has an unloading function, the screw rod 11 is controlled to move downwards to a second position, the lower end of the plug body 11a is abutted against the clamp spring 4d, the coil 10 is electrified, the armature 4a moves downwards under the action of a magnetic field of the coil 10 to compress the second spring 8, the lower control cavity 2a is communicated with the port P through the seventh through hole 22, the third annular groove 23, the third through hole 34, the first annular groove 42, the sixth through hole 31a, the second annular groove 31 and the fifth through hole 21, the upper control cavity 2b is communicated with the port T through the second through hole 33, the fourth annular groove 42a, the eighth through hole 43 and the fourth through hole 41, and the pressure of the port P acts on the annular area of the valve core 2 and the first shoulder 21 to jointly overcome the elastic force of the first spring 5, so that the valve core 2 can move upwards to open a valve port under a small pressure of the port P, and the unloading function is achieved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (6)

1. A solenoid valve is characterized by comprising a plug, wherein a vertically-penetrating mounting hole is formed in the plug, a valve sleeve is fixedly mounted at the lower end of the mounting hole, a first valve hole and a second valve hole are sequentially formed in the valve sleeve from top to bottom along the axial direction of the mounting hole, the upper end of the first valve hole is communicated with the mounting hole, the first valve hole and the second valve hole are communicated and coaxially arranged, the diameter of the mounting hole is larger than that of the first valve hole, and the diameter of the first valve hole is larger than that of the second valve hole; the lower end of the second valve hole is a T-shaped hole, and a P hole communicated with the first valve hole is formed in the side surface of the valve sleeve; the upper end of the mounting hole is fixedly provided with a threaded sleeve, the opening at the lower end of the threaded sleeve is fixedly provided with a sliding sleeve, the lower end of the sliding sleeve penetrates through the mounting hole and the first valve hole and extends into the second valve hole, the first valve hole is connected with a valve core sleeved on the sliding sleeve in a sliding manner, and the valve core is used for controlling the connection and disconnection of a P port and a T port; the outer side surface of the valve core, which is close to the upper end, is provided with a first convex shoulder which is connected in a sliding manner in the mounting hole along the radial direction, the mounting hole forms an upper control cavity between the screw sleeve and the first convex shoulder, a lower control cavity is formed between the first convex shoulder and the valve sleeve, and a first spring for forcing the first convex shoulder to move downwards is arranged in the upper control cavity; a magnetic conduction pipe is fixedly installed at an opening at the upper end of the screw sleeve, a plug is fixedly installed at the upper end of the magnetic conduction pipe, an armature is connected in the magnetic conduction pipe in a sliding mode, a coil is arranged on the outer side of the magnetic conduction pipe, and a valve rod extending into the sliding sleeve is arranged at the lower end of the armature; a second spring for forcing the armature to move upwards is arranged between the armature and the upper end of the sliding sleeve in the magnetic conduction pipe; a screw rod for controlling the moving distance of the armature is connected with the inner thread of the plug; when the coil is powered off, the armature iron moves upwards under the action of the second spring and props against the plug, and the lower control cavity is communicated with the T port; when the coil is electrified and the screw rod moves upwards to the first position, the armature moves downwards to compress the second spring, and the upper control cavity is completely closed; when the coil is electrified and the screw rod moves downwards to a second position, the armature moves downwards to compress the second spring, the upper control cavity is communicated with the T port, and the lower control cavity is communicated with the P port.
2. The electromagnetic valve according to claim 1, characterized in that a slide groove is provided in the armature in the axial direction thereof at a position near the upper end, and the upper end of the armature is provided with a notch communicating with the slide groove; a sliding hole with an opening at the lower end is formed in the plug, a plug body which is connected in the sliding hole in a sliding mode is arranged at the lower end of the screw rod, an adjusting rod which penetrates through the notch and extends into the sliding groove is arranged at the lower end of the plug body, and a second convex shoulder is arranged at the lower end of the adjusting rod along the radial direction; a clamp spring is arranged on the inner side wall of the sliding hole below the plug body, and when the screw rod moves upwards to the first position, the upper end of the plug body is abutted against the upper end of the sliding hole; when the screw rod moves downwards to the second position, the lower end of the plug body is abutted against the clamp spring.
3. The electromagnetic valve according to claim 2, wherein a first through hole and a second through hole which are communicated with the upper control cavity and a third through hole which is communicated with the lower control cavity are arranged in the side wall of the sliding sleeve from top to bottom at intervals; a fourth through hole communicated with the T port is formed in the valve rod, and a first annular groove communicated with the third through hole is formed in the outer side face of the valve rod; the sliding sleeve is provided with a second ring groove on the outer side surface close to the lower end, a fifth through hole for communicating the P port with the second ring groove is formed in the valve core, and a sixth through hole for communicating the lower end of the second ring groove with an inner hole of the sliding sleeve is formed in the sliding sleeve; a third annular groove communicated with the third through hole is formed in the side wall of the inner hole, close to the upper end, of the valve core, and a seventh through hole used for communicating the third annular groove with the lower control cavity is formed in the valve core; a fourth ring groove is formed in the outer side of the valve rod above the first ring groove, and an eighth through hole used for communicating the fourth ring groove with the fourth through hole is formed in the valve rod;
when the coil is powered off, the fourth ring groove is communicated with the first through hole, and the first ring groove is communicated with the second through hole and disconnected with the sixth through hole; when the coil is electrified and the screw rod moves upwards to the first position, the fourth ring groove is disconnected with the first through hole, and the first ring groove is disconnected with the second through hole and the sixth through hole; when the coil is electrified and the screw rod moves downwards to the second position, the fourth annular groove is communicated with the second through hole, and the first annular groove is disconnected with the second through hole and communicated with the sixth through hole.
4. The electromagnetic valve according to claim 1, wherein the outer side of the sliding sleeve is provided with a convex edge along the radial direction, the first spring is sleeved on the outer side of the sliding sleeve, and the upper end of the first spring abuts against the convex edge.
5. The electromagnetic valve according to claim 1, wherein when the port P and the port T are disconnected, the lower end of the spool is pressed against the opening at the upper end of the second valve hole, and when the port P and the port T are connected, the lower end of the spool is separated from the opening at the upper end of the second valve hole.
6. The solenoid valve of claim 1 wherein said plug is threadably connected to a limit nut, and said coil is positioned between said limit nut and said threaded sleeve.
CN202010545831.2A 2020-06-16 2020-06-16 Electromagnetic valve and working method thereof Active CN111692388B (en)

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Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2124034B (en) * 1982-06-28 1986-09-10 Imp Clevite Inc Solenoid valve
DE4231998A1 (en) * 1992-09-24 1994-03-31 Bosch Gmbh Robert Pressure regulating valve with proportional solenoid - has spool with displacement provided by proportional solenoid operating a small valve to vary pressure applied to end of valve spool
CN2184811Y (en) * 1994-01-17 1994-12-07 赵劲 Electromagnetic safety unloading valve for dump truck
JP2009008133A (en) * 2007-06-27 2009-01-15 Hitachi Ltd Solenoid valve
CN109538563B (en) * 2018-11-23 2020-08-04 凯斯通阀门有限公司 Balance valve
CN110878777B (en) * 2019-11-28 2021-06-01 温州英斯蒙特自动化仪表有限公司 Pressure control valve
CN111271477A (en) * 2020-02-22 2020-06-12 邵延荣 Electromagnetic stop safety valve
CN111271486B (en) * 2020-03-01 2023-04-07 山东东阀制冷科技有限公司 Pressure reducing valve

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