阅读说明：本技术 一种耐高压的多功能电磁阀及其控制方法 (High-pressure-resistant multifunctional electromagnetic valve and control method thereof ) 是由 孙王虎 孙灿华 郑成材 吴斯 宰德斌 孙誉宁 于 2021-09-09 设计创作，主要内容包括：本发明涉及自动控制领域,具体为一种耐高压的多功能电磁阀及其控制方法,包括阀体、阀芯组件和电磁线圈组件,三者为同心圆结构,其中阀芯组件位于阀体内部,电磁线圈组件位于阀体外侧。阀体内部一端为流入腔,另一端为流出腔,中部为止回腔,其中流入腔与止回腔通过隔片分隔,流出腔与止回腔通过腔壁分隔。断电时,在压簧压力作用下,螺帽压紧密封圈与端壁,而且阀芯滑动头抵紧隔片和密封垫,流出孔被滑动孔的内壁安全遮挡,从而使导流管内的流体无法流进流出腔,流出腔内流体也无法流进导流管内,阀门关闭,并具有止回阀功能；通电时,动铁芯在电磁力的作用下带动阀芯滑动头离开隔片和密封垫,同时螺帽和密封圈离开端壁,直至阀芯滑动头抵紧腔壁,流出孔不被滑动孔的内壁遮挡,流入腔内的流体经过导流管、流出孔流进流出腔,阀门开启。该发明具有耐压性好、适用性强、可靠性高、结构简单、节约电能、控制精度高等优点。(The invention relates to the field of automatic control, in particular to a high-pressure-resistant multifunctional electromagnetic valve and a control method thereof. The valve body is internally provided with an inflow cavity at one end, an outflow cavity at the other end and a non-return cavity at the middle part, wherein the inflow cavity is separated from the non-return cavity by a spacer, and the outflow cavity is separated from the non-return cavity by a cavity wall. When the power is off, the nut compresses the sealing ring and the end wall under the pressure of the pressure spring, the valve core sliding head abuts against the spacer and the sealing gasket, the outflow hole is safely shielded by the inner wall of the sliding hole, so that fluid in the flow guide pipe cannot flow into the outflow cavity, the fluid in the outflow cavity cannot flow into the flow guide pipe, the valve is closed, and the valve has the function of a check valve; when the valve is powered on, the movable iron core drives the valve core sliding head to leave the spacer and the sealing gasket under the action of electromagnetic force, the screw cap and the sealing ring leave the end wall simultaneously until the valve core sliding head abuts against the wall of the tight cavity, the outflow hole is not shielded by the inner wall of the sliding hole, fluid flowing into the cavity flows into and out of the cavity through the flow guide pipe and the outflow hole, and the valve is opened. The invention has the advantages of good pressure resistance, strong applicability, high reliability, simple structure, electric energy saving, high control precision and the like.)

1. A high-pressure resistant multifunctional electromagnetic valve and a control method thereof are characterized in that the electromagnetic valve consists of a valve body (1), a valve core assembly (2) and an electromagnetic coil assembly (3), and the three are of concentric circle structures; the valve core assembly (2) is positioned inside the valve body (1), and the electromagnetic coil assembly (3) is positioned outside the valve body (1); the valve body (1) adopts an integral sealing structure, and except that two ends of the valve body are provided with threads/flanges connected with an external pipeline, other parts are not provided with installation and assembly holes communicated with the outside;

one end of the interior of the valve body (1) is an inflow cavity (4), the other end of the interior of the valve body is an outflow cavity (5), the middle part of the interior of the valve body is a non-return cavity (6), a spacer (7) is arranged in the inflow cavity (4), a baffle (8) is arranged in the outflow cavity, through holes are formed in the centers of the spacer (7) and the baffle (8), and the spacer and the valve body (1) are fixed and sealed through threads; a coil step (9) for mounting the electromagnetic coil assembly (3) is arranged on the outer side of the check cavity (6); the outflow cavity (5) and the check cavity (6) are separated by a concave cavity wall (10), and the inflow cavity (4) and the check cavity (6) are separated by the spacer (7); the center of the concave cavity wall (10) is provided with a high-precision sliding hole (11), the outer side of the cavity wall (10) is provided with an iron core groove (12), and the end face of the cavity wall (10) facing to the outflow cavity (5) is a high-precision end wall (13).

2. The high-pressure-resistant multifunctional electromagnetic valve and the control method thereof according to claim 1 are characterized in that the valve core assembly (2) comprises a pressure spring (14), a sealing ring (15), a special screw (16), a flow guide pipe (17), a movable iron core (18), a sheath (19) and a sealing gasket (20), one end of the flow guide pipe (17) is a flaring (21) with a curled edge, and the other end of the flow guide pipe is provided with a back cover (22) with a central hole and internal threads; the wall of the draft tube (17) is provided with a pressure relief hole (23) and a plurality of outflow holes (24); the movable iron core (18) is of a round tube structure, is sleeved outside the flow guide tube (17) and is fixed by the flow guide tube (17) and the flaring opening (21) thereof; the sheath (19) is wrapped on the surface of the movable iron core (18), and is fixedly connected with the outer wall of the flow guide pipe (17) and the flaring (21) thereof into a whole to tightly seal the movable iron core (18), and the flow guide pipe (17), the movable iron core (18) and the sheath (19) form an integral valve core sliding head (25); the special screw (16) is a large flat-head inner hexagonal screw with a step at the head, the thread of the special screw is matched with the inner thread of the central hole of the back cover (22), the step at the head of the special screw is matched with the inner diameter of the pressure spring (14), and the shoulder part of the nut of the special screw is matched with the sealing ring (15); one end of the pressure spring (14) is clamped with a step of the head of the nut of the special screw (16), and the other end of the pressure spring is embedded into a concave step arranged at the center of the inner side of the baffle plate (8); the sealing ring (15) is sleeved outside the back cover (22) and fixed between the special screw (16) and the cavity wall (10); the sealing gasket (20) is arranged on the surface of the spacer (7) facing the non-return cavity (6).

3. The multifunctional electromagnetic valve with high pressure resistance and the control method thereof according to claim 1, characterized in that the electromagnetic coil assembly (3) is composed of a static iron core (26), a coil (27), a lead wire (28), an end cover (29) and a shell (30); the static iron cores (26) are in two groups of semicircular shapes and are clamped at the iron core groove (12), and the end covers (29) are clamped at the internal corners of the coil steps (9); the coil (27) is an electromagnetic coil and is sleeved on a coil step (9) between the static iron core (26) and the end cover (29); the lead (28) is electrically connected with the coil (27) and passes through a wire passing hole arranged on the end cover (29) to be connected with an external circuit; the shell (30) is sleeved outside the static iron core (26), the coil (27) and the end cover (29) and is fixed with the static iron core (26) and the end cover (29); the surface of the static iron core (26), the surface of the end cover (29) and the surface of the shell (30) are all provided with anti-corrosion decorative films, and the decorative films are provided with nameplates, fluid directions and power supply marks.

4. The multifunctional high-pressure-resistant electromagnetic valve and the control method thereof according to claim 1, wherein the baffle (8) is a pressure adjusting mechanism of a pressure spring (14), a sealing ring (15) and a valve core sliding head (25); the nut diameter of the special screw (16) is larger than the aperture of the sliding hole (11), and the special screw is matched with the sealing ring (15) to form a check valve mechanism; the inflow cavity (4) is connected with the water inlet pipe through a thread/flange, and the outflow cavity (5) is connected with the water outlet pipe through a thread/flange.

5. The high pressure resistant multifunctional electromagnetic valve and the control method thereof according to claim 2, characterized in that the flow guide pipe (17) has a high precision outer wall, and is inserted into the high precision sliding hole (11), and the gap between the two allows the flow guide pipe (17) to slide freely in the axial direction and the fluid is difficult to pass through; the pressure relief hole (23) is arranged close to the movable iron core (18) and is communicated with the inside of the flow guide pipe (17) and the check cavity (6); when the valve core sliding head (25) abuts against the spacer (7) and the sealing gasket (20), the outflow hole (24) is safely shielded by the inner wall of the sliding hole (11), the sealing ring (15) is tightly attached to the end wall (13) under the action of the pressure spring (14), fluid in the flow guide pipe (17) cannot flow into the outflow cavity (5), and fluid in the outflow cavity (5) cannot flow into the flow guide pipe (17).

6. The high-pressure-resistant multifunctional electromagnetic valve and the control method thereof according to claim 2, wherein the movable iron core (18), the static iron core (26), the housing (30) and the end cover (29) are made of high-permeability materials, and the flow guide pipe (17), the pressure spring (14), the valve body (1), the baffle plate (8), the spacer (7) and the sheath (19) are made of corrosion-resistant materials.

7. The multifunctional electromagnetic valve with high pressure resistance and the control method thereof according to claim 1, characterized in that the aperture of the central hole of the spacer (7) and the baffle (8) and the inner diameter of the flow guide pipe (17) are both D1, the aperture of the sliding hole (11) is D2, the diameter of the nut of the special screw (16) is D3, the inner diameter of the check cavity (6) is D4, the inner diameter of the inflow cavity (4) is D5, and the aperture of the outflow cavity (5) is D6; the diameter of the valve core sliding head (25) is the inner diameter D4 minus the movement clearance of the check cavity (6), and the value is approximate to D4 because the movement clearance is smaller; the outer diameter of the guide pipe (17) is the bore diameter D2 of the sliding hole (11) to reduce the sliding clearance, the sliding clearance is extremely small, the value is approximate to D2, and the following mathematical relationship is provided:

D5≥D4＞D3＞D2＞D1，

D6＞D3，

D42-D22≥D12。

8. the high pressure resistant multifunctional electromagnetic valve and the control method thereof according to claim 2, characterized in that the flaring (21) of the flow guide pipe (17) is opposite to the central hole of the spacer (7), the inflow chamber (4) is communicated with the inside of the flow guide pipe (17), and the fluid pressure is P1; the check cavity (6) is communicated with the inside of the draft tube (17) through a pressure relief hole (23), and the water pressure of the check cavity is P1; the valve core sliding head (25) generates a force F1 in the direction of the outflow cavity (5) and a force F2 in the direction of the inflow cavity (4) under the action of fluid pressure P1; the bottom sealing (22) of the draft tube (17) generates a force F3 in the direction of the outflow cavity (5) under the action of fluid pressure P1, and the special screw (16) generates a force F4 in the direction of the inflow cavity (4) under the action of fluid pressure P2 of the outflow cavity (5); the acting force of the pressure spring (14) is F5, and the electromagnetic force is F6;

after the coil (27) is powered off, F6 is 0, the valve core sliding head (25) tightly abuts against the sealing gasket (20) and the spacer (7) under the action of F5, F1 is 0, and the resultant force of the valve core assembly (2) in the direction of the inflow cavity (4) can be simplified as follows:

F-off-F5 + F4+ F2-F3-F5 + pi P2 × D32/4+ pi P1 × (D42-D22-D12)/4 ≧ F5+ pi P2 × D32/4

F6 is as follows when the coil (27) is electrified initially:

F6≥F5+πP2×D32/4+πP1×(D42-D22-D12)/4

the valve core sliding head (25) leaves the sealing gasket (20), and after the sealing ring (15) leaves the end wall (13), the resultant force of the valve core assembly (2) in the direction of the inflow cavity (4) can be simplified as follows:

f is F6-F5.

Technical Field

The invention belongs to the field of automatic control, and relates to a high-pressure-resistant multifunctional electromagnetic valve and a control method thereof.

Background

At present, the electromagnetic valve for liquid mainly has a direct-acting type and a pilot-operated type. A direct-acting solenoid valve, taking a normally closed type as an example, is a normally open type, as opposed to a normally closed type: when the valve is electrified, the electromagnetic coil generates electromagnetic attraction to lift the valve core, so that the closing member is separated from the valve seat to seal the valve and open; when the power is cut off, the electromagnetic force disappears, and the closing element is pressed on the valve seat by the spring force to close the valve. The solenoid is bulky, high in energy consumption, and its reliability is directly affected by the fluid pressure, since it needs to overcome the spring force.

When the pilot-operated solenoid valve is electrified, the pilot-operated valve is driven by electromagnetic force to open the pilot valve, the pressure in the upper cavity of the main valve is rapidly reduced, differential pressure is formed in the upper cavity and the lower cavity of the main valve, the closing member of the main valve is pushed to move upwards by medium pressure, and the valve is opened; when the power is cut off, the spring force closes the pilot valve, and the pressure of the inlet medium quickly enters the upper cavity of the main valve through the pilot hole to form differential pressure in the upper cavity, so that the main valve is closed. It can be seen that the pilot-operated solenoid valve is not only susceptible to the pressure of the medium, but also has a complex construction.

In addition, the existing electromagnetic valve has the problems of single function, complex structure, larger volume, leakage hidden danger and the like.

Disclosure of Invention

In order to solve the problems of the prior art, the invention provides a high-pressure-resistant multifunctional electromagnetic valve and a control method thereof, and the specific technical scheme is as follows:

a high pressure resistant multifunctional electromagnetic valve and its control method, the said electromagnetic valve is made up of valve block, valve core assembly and electromagnetic coil assembly, the three are concentric structure; the valve core assembly is positioned inside the valve body, and the electromagnetic coil assembly is positioned outside the valve body; the valve body adopts an integral sealing structure, and other parts do not have installation and assembly holes communicated with the outside except for threads/flanges connected with an external pipeline at two ends;

one end of the interior of the valve body is an inflow cavity, the other end of the interior of the valve body is an outflow cavity, the middle part of the interior of the valve body is a non-return cavity, a spacer is arranged in the inflow cavity, a baffle is arranged in the outflow cavity, through holes are formed in the centers of the spacer and the baffle, and the spacer and the baffle are fixed and sealed with the valve body through threads; a coil step for mounting an electromagnetic coil assembly is arranged on the outer side of the check cavity; the outflow cavity and the check cavity are separated by a concave cavity wall, and the inflow cavity and the check cavity are separated by the spacer; the concave cavity wall center is provided with a high-precision sliding hole, the outer side of the cavity wall is provided with an iron core groove, and the end face of the cavity wall, facing one side of the outflow cavity, is a high-precision end wall.

The valve core assembly comprises a pressure spring, a sealing ring, a special screw, a flow guide pipe, a movable iron core, a sheath and a sealing gasket, wherein one end of the flow guide pipe is an expansion opening with a curled edge, and the other end of the flow guide pipe is provided with a back cover with a central hole and internal threads; the wall of the flow guide pipe is provided with a pressure relief hole and a plurality of outflow holes; the movable iron core is of a circular tube structure, is sleeved outside the flow guide tube and is fixed by the flow guide tube and the flaring thereof; the sheath is wrapped on the surface of the movable iron core and is fixedly connected with the outer wall of the flow guide pipe and the flaring thereof into a whole to tightly seal the movable iron core, and the flow guide pipe, the movable iron core and the sheath form an integral valve core sliding head; the special screw is a large flat-head inner hexagonal screw with a step at the head, the thread of the special screw is matched with the inner thread of the central hole of the back cover, the step at the head of the special screw is matched with the inner diameter of the pressure spring, and the shoulder part of the nut of the special screw is matched with the sealing ring; one end of the pressure spring clamps a nut head step of the special screw, and the other end of the pressure spring is embedded into a concave step arranged in the center of the inner side of the separation blade; the sealing ring is sleeved outside the back cover and is fixed between the special screw and the cavity wall; the sealing gasket is arranged on the surface of the spacer facing the non-return cavity.

The electromagnetic coil assembly consists of a static iron core, a coil, a lead, an end cover and a shell; the static iron cores are in two groups of semicircular shapes and are clamped and fixed at the positions of the iron core grooves, and the end covers are clamped and fixed at the internal corners of the coil steps; the coil is an electromagnetic coil and is sleeved on a coil step between the static iron core and the end cover; the lead is electrically connected with the coil and passes through the wire passing hole arranged on the end cover to be connected with an external circuit; the shell is sleeved outside the static iron core, the coil and the end cover and is fixed with the static iron core and the end cover; the static iron core, the end cover and the surface of the shell are all provided with anticorrosive decorative films, and the decorative films are provided with nameplates, fluid directions and power supply marks.

The blocking piece is a pressure adjusting mechanism of a pressure spring, a sealing ring and a valve core sliding head; the diameter of the nut of the special screw is larger than the aperture of the sliding hole, and the special screw is matched with the sealing ring to form a check valve mechanism; the inflow cavity is connected with the water inlet pipe through a thread/flange, and the outflow cavity is connected with the water outlet pipe through a thread/flange.

The guide pipe is provided with a high-precision outer wall and is inserted into the high-precision sliding hole, and the gap between the guide pipe and the high-precision sliding hole allows the guide pipe to slide freely in the axial direction and fluid to pass through the guide pipe difficultly; the pressure relief hole is arranged close to the movable iron core and is communicated with the inner part of the flow guide pipe and the check cavity; when the valve core sliding head is tightly abutted to the spacer and the sealing gasket, the outflow hole is safely shielded by the inner wall of the sliding hole, the sealing ring is tightly attached to the end wall under the action of the pressure spring, fluid in the flow guide pipe cannot flow into the outflow cavity, and fluid in the outflow cavity cannot flow into the flow guide pipe.

The movable iron core, the static iron core, the shell and the end cover are made of materials with high magnetic conductivity, and the flow guide pipe, the pressure spring, the valve body, the baffle plate, the spacer and the sheath are made of corrosion-resistant materials.

The aperture of the central holes of the spacer and the baffle and the inner diameter of the flow guide pipe are both D1, the aperture of the sliding hole is D2, the diameter of the special screw and nut is D3, the inner diameter of the check cavity is D4, the inner diameter of the inflow cavity is D5, and the aperture of the outflow cavity is D6; the diameter of the valve core sliding head is the inner diameter D4 minus the movement clearance of the check cavity, and the value is approximate to D4 because the movement clearance is smaller; the outer diameter of the draft tube is the aperture D2 of the sliding hole to reduce the sliding clearance, and the sliding clearance is extremely small, the value is approximate to D2, and the following mathematical relationship is provided: d5 is more than or equal to D4, more than D3, more than D2, more than D1, more than D6, more than D3, and D42-D22 is more than or equal to D12.

The flaring of the flow guide pipe is over against the central hole of the spacer, the inflow cavity is communicated with the interior of the flow guide pipe, and the fluid pressure is P1; the check cavity is communicated with the interior of the flow guide pipe through a pressure relief hole, and the water pressure of the check cavity is P1; the valve core sliding head generates a force F1 in the direction of the outflow cavity and a force F2 in the direction of the inflow cavity under the action of fluid pressure P1; the bottom sealing of the draft tube generates a force F3 towards the direction of the outflow cavity under the action of fluid pressure P1, and the special screw generates a force F4 towards the direction of the inflow cavity under the action of fluid pressure P2 of the outflow cavity; the acting force of the pressure spring is F5, and the electromagnetic force is F6;

after the coil is powered off, F6 is 0, the valve core sliding head tightly abuts against the sealing gasket and the spacer under the action of F5, F1 is 0, and the resultant force of the valve core assembly in the direction of the inflow cavity can be simplified as follows:

F-off-F5 + F4+ F2-F3-F5 + pi P2 × D32/4+ pi P1 × (D42-D22-D12)/4 ≧ F5+ pi P2 × D32/4

F6 is the following when the coil is electrified initially:

F6≥F5+πP2×D32/4+πP1×(D42-D22-D12)/4

the valve core sliding head leaves the sealing gasket, and after the sealing ring leaves the end wall, the resultant force of the valve core assembly in the direction of the inflow cavity can be simplified as follows:

f is F6-F5.

Compared with the prior art, the invention has the advantages of good pressure resistance, strong applicability, high reliability, simple structure, electric energy saving and high control precision;

firstly, in order to solve the leakage problem, the valve body of the high-pressure-resistant multifunctional electromagnetic valve provided by the invention adopts an integral sealing structure, and except that two ends of the valve body are provided with threads and flanges connected with an external pipeline, other parts are not provided with installation and assembly gaps communicated with the outside;

secondly, in order to solve the problem of energy consumption, the spring pressure of the high-pressure-resistant multifunctional electromagnetic valve provided by the invention is small due to the fact that the strong correlation between the spring pressure and the fluid pressure is not large, and the electromagnetic force for overcoming the spring pressure is small, so that the energy consumption is saved;

thirdly, in order to solve the problem of high pressure resistance, the higher the pressure of fluid flowing into the cavity is, the better the sealing performance of the valve core is, and meanwhile, the higher the pressure of fluid flowing out of the cavity is, the better the non-return function of the valve core is, so that the valve can be suitable for controlling high-pressure fluid, medium-pressure fluid and low-pressure fluid;

fourthly, in order to solve the problem of single function, the high-pressure resistant multifunctional electromagnetic valve provided by the invention has the function of a check valve;

fifthly, the high-pressure-resistant multifunctional electromagnetic valve provided by the invention adopts a concentric circle structure, and has the advantages of simple structure, compact structure, small volume, water and electricity isolation, convenience in production and the like;

sixth, the invention provides a high-pressure-resistant multifunctional electromagnetic valve and a control method thereof, which relate to the technical fields of magnetics, hydromechanics, automatic control and the like, and can improve the control precision through algorithm optimization.

Drawings

FIG. 1 is a longitudinal cross-sectional view of the valve body;

FIG. 2 is a schematic view of a valve core assembly;

FIG. 3 is a schematic view of the solenoid assembly;

fig. 4 is a longitudinal sectional view of the present invention.

In the figure: the electromagnetic valve comprises a valve body 1, a valve core assembly 2, an electromagnetic coil assembly 3, an inflow cavity 4, an outflow cavity 5, a non-return cavity 6, a spacer 7, a baffle 8, a coil step 9, a cavity wall 10, a sliding hole 11, an iron core groove 12, an end wall 13, a compression spring 14, a sealing ring 15, a special screw 16, a flow guide pipe 17, a movable iron core 18, a protective sleeve 19, a sealing gasket 20, a flared opening 21, a back cover 22, a pressure relief hole 23, an outflow hole 24, a valve core sliding head 25, a static iron core 26, a coil 27, a lead 28, an end cover 29 and a shell 30.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 4, the present invention provides a technical solution: a high pressure resistant multifunctional electromagnetic valve and its control method, the said electromagnetic valve is made up of valve block 1, valve core assembly 2 and electromagnetic coil assembly 3, the three are concentric structure; the valve core assembly 2 is positioned inside the valve body 1, and the electromagnetic coil assembly 3 is positioned outside the valve body 1; the valve body 1 adopts an integral sealing structure, and except that two ends of the valve body are provided with threads/flanges connected with an external pipeline, other parts are not provided with installation and assembly holes communicated with the outside, so that the hidden danger of leakage is eliminated, and the valve body is suitable for high, medium and low pressure fluid;

one end of the interior of the valve body 1 is an inflow cavity 4, the other end of the interior of the valve body is an outflow cavity 5, the middle part of the interior of the valve body is a non-return cavity 6, a spacer 7 is arranged in the inflow cavity 4, a baffle 8 is arranged in the outflow cavity, and through holes are formed in the centers of the spacer 7 and the baffle 8 and are fixed and sealed with the valve body 1 through threads; a coil step 9 for mounting the electromagnetic coil assembly 3 is arranged on the outer side of the check cavity 6; the outflow cavity 5 is separated from the check cavity 6 by a concave cavity wall 10, and the inflow cavity 4 is separated from the check cavity 6 by the septum 7; the center of the concave cavity wall 10 is provided with a high-precision sliding hole 11, the outer side of the cavity wall 10 is provided with an iron core groove 12, and the end surface of the cavity wall 10 facing to the outflow cavity 5 is a high-precision end wall 13.

The valve core assembly 2 comprises a pressure spring 14, a sealing ring 15, a special screw 16, a guide pipe 17, a movable iron core 18, a sheath 19 and a sealing gasket 20, wherein one end of the guide pipe 17 is a flaring 21 with a curled edge, and the other end of the guide pipe is provided with a back cover 22 with a central hole and internal threads; the wall of the draft tube 17 is provided with a pressure relief hole 23 and a plurality of outflow holes 24; the movable iron core 18 is of a circular tube structure, is sleeved outside the flow guide tube 17 and is fixed by the flow guide tube 17 and the flaring 21 thereof; the sheath 19 is wrapped on the surface of the movable iron core 18 and is fixedly connected with the outer wall of the flow guide pipe 17 and the flaring 21 thereof into a whole, the movable iron core 18 is tightly sealed, and the flow guide pipe 17, the movable iron core 18 and the sheath 19 form an integrated valve core sliding head 25;

the special screw 16 is a large flat-head inner hexagonal screw with a step at the head, the thread of the special screw is matched with the inner thread of the central hole of the back cover 22, the step at the head of the special screw is matched with the inner diameter of the pressure spring 14, and the shoulder part of the nut of the special screw is matched with the sealing ring 15;

one end of the pressure spring 14 clamps a step of the head of the special screw 16, and the other end of the pressure spring is embedded into a concave step arranged at the center of the inner side of the baffle plate 8; the sealing ring 15 is sleeved outside the back cover 22 and fixed between the special screw 16 and the cavity wall 10; the sealing gasket 20 is arranged on the surface of the baffle 7 facing the non-return cavity 6.

The electromagnetic coil component 3 consists of a static iron core 26, a coil 27, a lead 28, an end cover 29 and a shell 30; the static iron core 26 is in two groups of semicircular shapes and is clamped and fixed at the position of the iron core groove 12, and the end cover 29 is clamped and fixed at the internal corner of the coil step 9; the coil 27 is an electromagnetic coil and is sleeved on the coil step 9 between the static iron core 26 and the end cover 29; the lead 28 is electrically connected with the coil 27 and connected with an external circuit through a wire passing hole arranged on the end cover 29; the shell 30 is sleeved outside the static iron core 26, the coil 27 and the end cover 29 and is fixed with the static iron core 26 and the end cover 29; the surfaces of the static iron core 26, the end cover 29 and the shell 30 are all provided with anti-corrosion decorative films, and the decorative films are provided with nameplates, fluid directions and power supply marks.

The baffle sheet 8 is a pressure adjusting mechanism of a pressure spring 14, a sealing ring 15 and a valve core sliding head 25; the nut diameter of the special screw 16 is larger than the aperture of the sliding hole 11, and the special screw is matched with the sealing ring 15 to form a check valve mechanism; the inflow chamber 4 is connected with the water inlet pipe through a thread/flange, and the outflow chamber 5 is connected with the water outlet pipe through a thread/flange.

The draft tube 17 has a high-precision outer wall and is inserted into the high-precision sliding hole 11, and the clearance between the draft tube 17 and the high-precision sliding hole allows the draft tube 17 to freely slide axially and fluid to hardly pass through; the pressure relief hole 23 is arranged close to the movable iron core 18 and communicates the inside of the draft tube 17 with the check cavity 6; when the valve core sliding head 25 abuts against the spacer 7 and the sealing gasket 20 tightly, the outflow hole 24 is safely shielded by the inner wall of the sliding hole 11, the sealing ring 15 is tightly attached to the end wall 13 under the action of the pressure spring 14, fluid in the flow guide pipe 17 cannot flow into the outflow cavity 5, and fluid in the outflow cavity 5 cannot flow into the flow guide pipe 17.

The movable iron core 18, the static iron core 26, the shell 30 and the end cover 29 are made of materials with high magnetic conductivity, and the draft tube 17, the pressure spring 14, the valve body 1, the baffle plate 8, the spacer 7 and the sheath 19 are made of corrosion-resistant materials.

The aperture of the central holes of the spacer 7 and the baffle 8 and the inner diameter of the guide pipe 17 are both D1, the aperture of the sliding hole 11 is D2, the diameter of the special screw 16 and the nut is D3, the inner diameter of the check cavity 6 is D4, the inner diameter of the inflow cavity 4 is D5, and the aperture of the outflow cavity 5 is D6; the diameter of the valve core sliding head 25 is the inner diameter D4 of the check cavity 6 minus the movement clearance, and the value is approximate to D4 because the movement clearance is smaller; the outer diameter of the draft tube 17 is the bore diameter D2 of the sliding hole 11 to reduce the sliding clearance, and the sliding clearance is extremely small, and the value is approximately D2, and the following mathematical relationship is provided:

D5≥D4＞D3＞D2＞D1，

D6＞D3，

D42-D22≥D12。

the flaring 21 of the draft tube 17 is over against the central hole of the spacer 7, the inflow cavity 4 is communicated with the inside of the draft tube 17, and the fluid pressure is P1; the check cavity 6 is communicated with the interior of the draft tube 17 through a pressure relief hole 23, and the water pressure of the check cavity is P1; the valve core sliding head 25 generates a force F1 in the direction of the outflow cavity 5 and a force F2 in the direction of the inflow cavity 4 under the action of the fluid pressure P1; the bottom seal 22 of the draft tube 17 generates a force F3 in the direction of the outflow chamber 5 under the action of fluid pressure P1, and the special screw 16 generates a force F4 in the direction of the inflow chamber 4 under the action of fluid pressure P2 of the outflow chamber 5; the acting force of the pressure spring 14 is F5, and the electromagnetic force is F6;

after the coil 27 is powered off, F6 is 0, the spool sliding head 25 abuts against the gasket 20 and the spacer 7 under the action of F5, F1 is 0, and the resultant force of the spool assembly 2 in the direction of the inflow cavity 4 can be simplified as follows:

F-off-F5 + F4+ F2-F3-F5 + pi P2 × D32/4+ pi P1 × (D42-D22-D12)/4

D42-D22≥D12

Therefore:

f is not less than F5+ pi P2 xD 32/4

F5＞0-πP2×D32/4

It can be seen that:

firstly, the closing performance of the valve closing state is independent of the pressure P1 of the inflow chamber 4, so the solenoid valve of the invention can be applied to high, medium and low pressure fluid;

secondly, the closing performance of the valve closing state is positively correlated with the pressure P2 of the outflow cavity 5, so that the electromagnetic valve of the invention has the function of a check valve;

third, a lower spring pressure F5 is sufficient for valve closure.

Further, when the coil 27 is initially energized, the electromagnetic force F6 should be:

F6≥F5+πP2×D32/4+πP1×(D42-D22-D12)/4

after the spool sliding head 25 leaves the gasket 20 and the sealing ring 15 leaves the end wall 13, the resultant force of the spool assembly 2 in the direction of the inflow cavity 4 can be simplified as follows:

f is opened as F1-F2+ F3-F4-F5+ F6 ≈ F6-F5

The spring pressure F5 is smaller, so the electromagnetic force F6 is also smaller, and the energy-saving performance of the valve is outstanding.

The following is a more detailed description with reference to examples.

Example 1

The utility model provides a take low pressure solenoid valve for water of check valve (be not more than 0.1Mpa), the main part adopts ABS to mould plastics and makes, moves iron core 18 and adopts the silicon steel sheet to make, and quiet iron core 26, shell 30 and end cover 29 adopt pure iron to make, and honeycomb duct 17, pressure spring 14, separation blade 8, spacer 7 and sheath 19 are 304 stainless steel, and sheath 19 seals through laser welding with honeycomb duct 17. The sizes of the relevant parts are as follows: d1-8.0 mm, D2-10.0 mm, D3-14.0 mm, D4-16.0 mm, D5-18.0 mm, and D6-15.0 mm. The inflow cavity 4 is connected with a water inlet pipe through 4 internal threads, and the outflow cavity 5 is connected with a water outlet pipe through 4 external threads.

Example 2

The utility model provides a take solenoid valve (be not more than 0.6Mpa) for medium pressure water of check valve, movable iron core 18 adopts the silicon steel sheet to make, and quiet iron core 26, shell 30 and end cover 29 adopt pure iron to make, and valve body 1, honeycomb duct 17, pressure spring 14, separation blade 8, spacer 7, special screw 16 and sheath 19 are 304 stainless steel, and sheath 19 seals through laser welding with honeycomb duct 17. The sizes of the relevant parts are as follows: d1-8.0 mm, D2-10.0 mm, D3-14.0 mm, D4-16.0 mm, D5-18.0 mm, and D6-15.0 mm. The inflow cavity 4 is connected with a water inlet pipe through 4 internal threads, and the outflow cavity 5 is connected with a water outlet pipe through 4 external threads.

Example 3

The utility model provides a take solenoid valve (being not more than 10.0Mpa) for high-pressure hydraulic oil of check valve, move iron core 18 and adopt the silicon steel sheet to make, quiet iron core 26, shell 30 and end cover 29 adopt pure iron to make, and valve body 1, honeycomb duct 17, pressure spring 14, separation blade 8, spacer 7, special screw 16 and sheath 19 are 304 stainless steel, and sheath 19 seals through laser welding with honeycomb duct 17. The sizes of the relevant parts are as follows: d1-8.0 mm, D2-10.0 mm, D3-14.0 mm, D4-15.0 mm, D5-16.0 mm, and D6-15.0 mm. The inflow cavity 4 is connected with a water inlet pipe through 4 internal threads, and the outflow cavity 5 is connected with a water outlet pipe through 4 external threads.

Finally, it is to be noted that: the above examples are merely illustrative of the technical solutions of the present invention, and not limitative thereof; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.