Double stroke solenoid valve

Abstract

Disclose a kind of double-stroke electromagnetic valve, double-stroke electromagnetic valve includes electromagnetic valve shell, electromagnetic valve coil, electromagnetic valve upper fixed iron, electromagnetic valve lower fixed iron, electromagnetic valve spring, electromagnetic valve moving iron, electromagnetic valve spool, electromagnetic valve small valve hole sealant, electromagnetic valve sliding sleeve, electromagnetic valve small valve seat, electromagnetic valve big valve hole sealant and electromagnetic valve big valve seat, when electromagnetic valve is not energized, there is gap between electromagnetic valve moving iron and electromagnetic valve upper fixed iron, which constitutes the total stroke of electromagnetic valve moving iron, the bottom surface of electromagnetic valve sliding sleeve upturned edge is set with a gap between electromagnetic valve spool shaft shoulder top surface, which constitutes the first section opening stroke of electromagnetic valve, the big valve hole inlet end face opens the opening with the width of the second section opening stroke gap, plus the flow capacity of small valve hole, so that double-stroke electromagnetic valve has larger flow capacity when fully open, the working stroke of electromagnetic valve is set to double-stroke movement mechanism, to realize the reliable work of double-stroke electromagnetic valve under high working pressure.

Description

Technical Field

[0001] The invention belongs to the technical field of solenoid valves, in particular to a double-stroke solenoid valve. Background Art

[0002] With the increasing requirements for automobile emissions and the need for energy diversification, the application of clean fuels in automobiles is showing strong development potential. Among them, since hydrogen fuel emissions are water, it achieves true zero emissions, which has led to the development of the application of hydrogen fuel in hydrogen engine vehicles or hydrogen fuel cell vehicles. Hydrogen fuel is stored in high-pressure gas tanks in automobiles. The high-pressure gas tanks are connected to the hydrogen-using device with a pipeline. A control solenoid valve is set on the pipeline to control the opening and closing of the gas line. The stroke of the solenoid valve moving iron determines the size of the control valve opening and thus determines the size of the control valve flow rate. The hydrogen pressure required by the hydrogen-using device is relatively low, which makes the control valve The pressure difference between the inlet and outlet of the solenoid valve is large, and a large driving force is required to open the two-stroke solenoid valve. According to the well-known theory, the driving electromagnetic force of the solenoid valve is approximately proportional to the inverse of the square of the solenoid valve moving iron stroke. If the control valve has a large flow rate, the solenoid valve moving iron stroke needs to be large enough. If the solenoid valve moving iron stroke is large, the corresponding solenoid valve driving electromagnetic force is weak. Using a conventional single-stroke solenoid valve requires a larger coil size to obtain sufficient magnetic potential to ensure the reliable opening of the control valve. The limited installation space on the car limits the external boundary size of the control valve, which restricts the application of conventional single-stroke solenoid valves.

[0003] The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention proposes a double-stroke solenoid valve, which has double stroke, large flow, high working pressure and is suitable for occasions with limited space and compact structure.

[0005] The purpose of the present invention is achieved through the following technical solutions: a two-stroke solenoid valve comprising:

[0006] The solenoid valve coil has a convex ring at its lower end.

[0007] The lower iron of the solenoid valve is arranged at the lower part of the solenoid valve coil. The lower iron of the solenoid valve includes an axial through hole, a lower countersunk hole at the bottom end of the axial through hole, and an upper ring groove and a lower ring groove surrounding the axial through hole. The convex ring extends into the upper ring groove.

[0008] The upper fixed iron of the solenoid valve is arranged on the upper part of the solenoid valve coil. The solenoid valve coil, the upper fixed iron of the solenoid valve and the lower fixed iron of the solenoid valve constitute an integral structure. The bottom end of the upper fixed iron of the solenoid valve is provided with a recess.

[0009] The electromagnetic valve moving iron is installed in the axial through hole, and the electromagnetic valve moving iron has an axial hole.

[0010] The solenoid valve core is tightly fixed in the axial center hole, and the solenoid valve core includes a shaft shoulder that protrudes outward perpendicular to the axial direction.

[0011] The solenoid valve spring is installed between the fixed iron and the movable iron of the solenoid valve. One end of the solenoid valve spring is connected to the solenoid valve core, and the other end is connected to the recess. When the solenoid valve coil is not energized, the elastic force of the solenoid valve spring pushes the movable iron of the solenoid valve away from the fixed iron of the solenoid valve to form the initial gap δ of the total stroke of the movable iron of the solenoid valve. The lower end of the solenoid valve core is cured with the solenoid valve small valve hole sealant.

[0012] The solenoid valve sleeve is sleeved on the solenoid valve core. The solenoid valve sleeve includes an upper flange, a lower flange, a lower end stop and a radial hole of the sleeve connecting the inner and outer air cavities of the sleeve. The upper flange is clamped on the top of the shaft shoulder and a gap δ1 is set between the bottom surface of the upper flange and the top surface of the shaft shoulder to form the first opening stroke of the solenoid valve.

[0013] The solenoid valve small valve seat is installed in the lower end stop and the lower flange rivets it on the solenoid valve sleeve. The solenoid valve small valve seat includes an axial small valve hole Φ1 with a first diameter and a pit provided at the lower end. The solenoid valve large valve hole sealant is provided in the pit. The lower end flange of the solenoid valve small valve seat rivets the solenoid valve large valve hole sealant on the solenoid valve small valve seat.

[0014] The large valve seat of the solenoid valve includes an axial large valve hole Φ2 with a second diameter, an inner convex ring and a stop distributed along the inner wall of the large valve hole Φ2, a flow hole connecting the inner and outer air cavities of the large valve seat of the solenoid valve, and a radial hole and an outlet hole below the large valve seat of the solenoid valve. The stop is sleeved on the outer circle of the lower end of the lower fixed iron of the solenoid valve, and the inner convex ring is clamped in the lower ring groove to fix the large valve seat of the solenoid valve and the lower fixed iron of the solenoid valve into one body to form a solenoid valve structure. The second diameter is larger than the first diameter. The intake air enters the inner cavity of the large valve seat of the solenoid valve from the flow hole, and then enters the air cavity around the small valve hole Φ1 through the radial hole of the sliding sleeve from the lower end countersunk hole.

[0015] In the described two-stroke solenoid valve, when the solenoid valve coil is not energized, the sealing force acting on the sealant of the large valve hole of the solenoid valve is the force of the pressure difference above and below acting on the large valve hole Φ2 cross section plus the spring force of the solenoid valve spring, and the sealing force acting on the sealant of the small valve hole of the solenoid valve is the force of the pressure difference above and below acting on the small valve hole Φ1 cross section plus the spring force of the solenoid valve spring. The cross section of the small valve hole Φ1 is smaller than the cross section of the large valve hole Φ2.

[0016] In the described two-stroke solenoid valve, the solenoid valve coil starts to be energized. When there is an initial gap δ between the solenoid valve moving iron and the fixed iron on the solenoid valve, the electromagnetic driving force acting on the solenoid valve moving iron is less than the sealing force acting on the sealant of the large valve hole of the solenoid valve but greater than the sealing force acting on the sealant of the small valve hole of the solenoid valve. The electromagnetic driving force causes the solenoid valve moving iron to move upward, and the solenoid valve moving iron drives the solenoid valve core and the solenoid valve small valve hole sealant to move upward until the top surface of the shaft shoulder abuts against the bottom surface of the upper flange. The solenoid valve moving iron drives the solenoid valve core and the solenoid valve small valve hole sealant to move upward by the gap δ1 of the first opening stroke. The inlet end face of the small valve hole Φ1 opens an opening with a width of the gap δ1. The air inlet channel of the small valve hole Φ1 is formed by the flow hole, the inner cavity of the large valve seat of the solenoid valve, the lower end countersunk hole, the radial hole of the sliding sleeve, the air cavity around the top of the small valve hole Φ1 to the air path of the small valve hole Φ1. The high-pressure gas in the air cavity around the top of the small valve hole Φ1 flows from the small valve hole Φ1 into the outlet hole, thereby reducing the pressure difference on both sides of the inlet and outlet of the sealant of the large valve hole of the solenoid valve. In addition, the force area of ​​the sealant of the large valve hole of the solenoid valve acted on by the pressure difference on both sides of the inlet and outlet of the sealant is reduced due to the opening of the small valve hole Φ1, and the cross-sectional area of ​​the small valve hole Φ1 is reduced.

[0017] In the described two-stroke solenoid valve, after the solenoid valve moving iron attracts the gap δ1 of the first opening stroke, the electromagnetic driving force it receives at the beginning of the second opening stroke increases, and the solenoid valve moving iron drives the solenoid valve spool and the solenoid valve small valve hole sealant to move the gap δ1 of the first opening stroke, so that the pressure difference acting on the inlet and outlet sides of the solenoid valve large valve hole sealant is reduced, and the force area of ​​the pressure difference acting on the solenoid valve large valve hole sealant is reduced, and the driving electromagnetic force received by the solenoid valve moving iron at the beginning of the second opening stroke increases, so that the driving force acting on the solenoid valve moving iron is greater than that acting on the solenoid valve. The sealing force on the large valve hole sealant of the magnetic valve causes the solenoid valve moving iron to drive the solenoid valve spool, the small valve hole sealant of the solenoid valve, the solenoid valve sleeve, the small valve seat of the solenoid valve and the large valve hole sealant of the solenoid valve to move upward until the top surface of the solenoid valve moving iron abuts against the bottom surface of the fixed iron on the solenoid valve. The solenoid valve moving iron drives the solenoid valve spool, the small valve hole sealant of the solenoid valve, the solenoid valve sleeve, the small valve seat of the solenoid valve and the large valve hole sealant to move upward by the gap δ-δ1 of the second opening stroke, and the inlet end face of the large valve hole Φ2 opens an opening with a width of the gap δ-δ1 of the second opening stroke.

[0018] In the described two-stroke solenoid valve, after the solenoid valve coil is powered off, the electromagnetic force acting on the solenoid valve moving iron disappears, and the pressure difference force acting on the upper and lower sides of the solenoid valve large valve hole sealant and the solenoid valve small valve hole sealant and the spring force causes the solenoid valve moving iron, the solenoid valve sleeve, the solenoid valve small valve hole sealant, the solenoid valve small valve seat and the solenoid valve large valve hole sealant to return to their positions and close the two-stroke solenoid valve.

[0019] In the two-stroke solenoid valve, the solenoid valve core further includes a hollow axial hole and a radial hole passing through the hollow axial hole.

[0020] In the double-stroke solenoid valve, the central axes of the small valve hole Φ1 and the large valve hole Φ2 are coaxial.

[0021] In the described double-stroke solenoid valve, the described solenoid valve large valve seat also includes a central annular groove of the solenoid valve large valve seat, and a high and low pressure cavity isolation sealing ring is provided in the central annular groove of the solenoid valve large valve seat to isolate and seal the high and low pressure cavities between the inlet and outlet.

[0022] In the described two-stroke solenoid valve, the overall structure also includes a solenoid valve housing, the solenoid valve coil is installed in the solenoid valve housing, the upper and lower parts of the solenoid valve coil are respectively provided with a solenoid valve upper iron and a solenoid valve lower iron, and are riveted into an overall structure with the flange of the solenoid valve housing.

[0023] In the double-stroke solenoid valve, a middle ring groove is provided between the upper ring groove and the lower ring groove, and a sealing ring is installed in the middle ring groove for sealing.

[0024] Compared with the prior art, the present invention has the following advantages: in the double-stroke solenoid valve described in the present invention, when the solenoid valve coil starts to be energized and there is an initial gap δ between the solenoid valve moving iron and the fixed iron on the solenoid valve, the electromagnetic driving force acting on the solenoid valve moving iron is less than the sealing force acting on the sealant of the large valve hole of the solenoid valve but greater than the sealing force acting on the sealant of the small valve hole of the solenoid valve, the electromagnetic driving force causes the solenoid valve moving iron to move upward, and the solenoid valve moving iron drives the solenoid valve spool and the solenoid valve small valve hole sealant to move upward until the top surface of the shaft shoulder abuts against the bottom surface of the upper flange, and the solenoid valve moving iron moves upward. The iron drives the solenoid valve core and the solenoid valve small valve hole sealant to move upward the gap δ1 of the first opening stroke, so that the inlet end face of the small valve hole Φ1 opens an opening with a width of the gap δ1. After the solenoid valve moving iron attracts the gap δ1 of the first opening stroke, the electromagnetic driving force it receives at the beginning of the second opening stroke increases. The solenoid valve moving iron drives the solenoid valve core and the solenoid valve small valve hole sealant to move the gap δ1 of the first opening stroke, so that the pressure difference on the inlet and outlet sides of the solenoid valve large valve hole sealant is reduced, and the pressure difference acts on the force on the solenoid valve large valve hole sealant. The area is reduced and the driving electromagnetic force applied to the solenoid valve moving iron at the beginning of the second opening stroke is increased, so that the driving force acting on the solenoid valve moving iron is greater than the sealing force acting on the solenoid valve large valve hole sealant, so that the solenoid valve moving iron drives the solenoid valve spool, the solenoid valve small valve hole sealant, the solenoid valve sleeve, the solenoid valve small valve seat and the solenoid valve large valve hole sealant to move upward until the top surface of the solenoid valve moving iron abuts against the bottom surface of the solenoid valve upper fixed iron, and the solenoid valve moving iron drives the solenoid valve spool, the solenoid valve small valve hole sealant, the solenoid valve sleeve, the solenoid valve small valve seat and the solenoid valve large valve hole sealant The gap δ-δ1 of the second opening stroke is moved upward, and the inlet end face of the large valve hole Φ2 opens an opening with a width of the gap δ-δ1 of the second opening stroke. The large valve hole Φ2 has a larger diameter, so that the inlet end face of the large valve hole opens an opening with a width of δ-δ1 of the second opening stroke to obtain a larger flow capacity. Combined with the flow capacity of the small valve hole Φ1, the two-stroke solenoid valve has a large flow capacity when fully open. The working stroke of the solenoid valve is set to a two-stroke motion mechanism, which realizes the reliable operation of the two-stroke solenoid valve with large flow rate under high working pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Various other advantages and benefits of the present invention will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are intended only to illustrate preferred embodiments and are not to be construed as limiting the present invention. It should be understood that the drawings described below are merely examples of the present invention, and that those skilled in the art will be able to derive other drawings from these drawings without inventive effort. Throughout the drawings, identical reference numerals are used to denote identical components.

[0026] In the attached figure:

[0027] Figure 1 2. It is a structural diagram of a double-stroke solenoid valve according to an embodiment of the present invention;

[0028] Figure 2 2 is a schematic structural diagram of a double-stroke solenoid valve in an open state of a small valve hole according to an embodiment of the present invention;

[0029] Figure 3 2. It is a structural schematic diagram of a double-stroke solenoid valve in a fully open state according to an embodiment of the present invention;

[0030] Figure 4 Schematic diagram of a solenoid valve lower fixing iron of a double-stroke solenoid valve according to an embodiment of the present invention;

[0031] Figure 5 Schematic diagram of a large solenoid valve seat of a double-stroke solenoid valve according to an embodiment of the present invention;

[0032] Figure 6 Schematic diagram of a solenoid valve sleeve of a double-stroke solenoid valve according to an embodiment of the present invention.

[0033] The present invention will be further explained below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0034] The following will refer to the attached Figures 1 to 6 Specific embodiments of the present invention will now be described in greater detail. Although specific embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention may be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to facilitate a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0035] It should be noted that certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. This specification and claims do not use the difference in nouns as a way to distinguish components, but use the difference in the functions of the components as the criterion for distinction. As mentioned throughout the specification and claims, "including" or "comprising" is an open term, so it should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of the present invention, but the description is based on the general principles of the specification and is not intended to limit the scope of the invention. The scope of protection of the present invention shall be as defined in the attached claims.

[0036] To facilitate understanding of the embodiments of the present invention, further explanation will be given below using specific embodiments as examples in conjunction with the accompanying drawings, and the accompanying drawings do not constitute a limitation on the embodiments of the present invention.

[0037] For better understanding, Figures 1 to 6 As shown, the double-stroke solenoid valve includes: a solenoid valve housing 1, a solenoid valve coil 2, a solenoid valve upper fixed iron 3, a solenoid valve lower fixed iron 4, a solenoid valve spring 5, a solenoid valve moving iron 6, a solenoid valve spool 7, a solenoid valve small valve hole sealant 8, a solenoid valve sleeve 9, a solenoid valve small valve seat 10, a solenoid valve large valve hole sealant 11 and a solenoid valve large valve seat 12, the solenoid valve coil 2 is installed in the solenoid valve housing 1, and the upper and lower parts of the solenoid valve coil 2 are respectively provided with a solenoid valve upper fixed iron 3 and a solenoid valve lower fixed iron 4 and are riveted into a whole with the flanging of the solenoid valve housing 1, the lower end of the solenoid valve coil 2 is provided with a convex ring 2-1, and the solenoid valve lower fixed iron 4 is provided with an upper ring groove 4-1, a middle ring groove 4-2, a lower ring groove 4-3, and a lower end countersunk groove. Hole 4-4 and axial through hole 4-5, the lower end convex ring 2-1 of the solenoid valve coil 2 extends into the upper ring groove 4-1 of the lower fixed iron 4 of the solenoid valve and a sealing ring is provided between the lower end convex ring 2-1 of the solenoid valve coil 2 and the upper ring groove 4-1 of the lower fixed iron 4 of the solenoid valve for sealing, the middle ring groove 4-2 of the lower fixed iron 4 of the solenoid valve is used to install the sealing ring, the solenoid valve moving iron 6 is installed in the axial through hole 4-5 of the lower fixed iron 4 of the solenoid valve, a solenoid valve spring 5 is installed between the solenoid valve upper fixed iron 3 and the solenoid valve moving iron 6, the solenoid valve spool 7 is tightly fixed in the axial hole of the solenoid valve moving iron 6, and the elastic force of the solenoid valve spring 5 pushes the solenoid valve moving iron 6 away from the solenoid valve upper fixed iron 3 when the coil is not energized, thereby forming a gap δ of the total stroke of the solenoid valve moving iron 6.

[0038] The solenoid valve core 7 is provided with a shaft shoulder 7-1, and the solenoid valve core 7 is provided with a radial hole that penetrates the hollow axial hole of the solenoid valve core 7 so that the upper and lower areas of the solenoid valve moving iron 6 are connected to reduce the movement resistance of the solenoid valve moving iron 6. The lower end head of the solenoid valve core 7 is solidified with a solenoid valve small valve hole sealant 8, and the solenoid valve sleeve 9 is sleeved on the solenoid valve core 7. The solenoid valve sleeve 9 is provided with an upper flange 9-1, a lower flange 9-2, a lower end stop 9-3 and a sleeve radial hole 9-4 connecting the inner and outer air cavities of the sleeve 9. The upper flange of the solenoid valve sleeve 9 9-1 is stuck on the top of the solenoid valve core 7 shaft shoulder 7-1, and a gap δ1 constituting the first section of the opening stroke of the solenoid valve is provided between the bottom surface of the upper flange 9-1 of the solenoid valve sleeve 9 and the top surface of the shaft shoulder 7-1 of the solenoid valve core 7. The solenoid valve small valve seat 10 is installed in the lower end stop 9-3 of the solenoid valve sleeve 9. The lower flange 9-2 of the solenoid valve sleeve 9 rivets the solenoid valve small valve seat 10 to the solenoid valve sleeve 9. A small valve hole Φ1 is provided on the solenoid valve small valve seat 10, and a solenoid valve large valve hole sealant 11 is provided in the pit at the lower end of the solenoid valve small valve seat 10. The lower end flange of the solenoid valve small valve seat 10 rivets the solenoid valve large valve hole sealant 11 on the solenoid valve small valve seat 10. The solenoid valve large valve seat 12 is provided with a large valve hole Φ2, a stopper 12-1, an inner convex ring 12-2, a flow hole 12-3 connecting the inner and outer air cavities of the solenoid valve large valve seat 12, a radial hole 12-4 below the solenoid valve large valve seat 12, a flow hole 12-5 of the solenoid valve large valve seat 12 and a ring groove 12-6 in the middle of the solenoid valve large valve seat 12. The stopper 12-1 of the solenoid valve large valve seat 12 is sleeved on the outer circle of the lower end of the solenoid valve lower fixed iron 4. The inner convex ring 12-2 formed by external riveting on the large valve seat 12 of the solenoid valve is stuck in the lower ring groove 4-3 of the lower fixed iron 4 of the solenoid valve, so that the large valve seat 12 of the solenoid valve is fixed to the lower fixed iron 4 of the solenoid valve as a whole. The middle ring groove 12-6 of the large valve seat 12 of the solenoid valve is used to install the sealing ring that isolates the high and low pressure chambers. The intake air enters the inner cavity of the large valve seat 12 of the solenoid valve from the flow hole 12-3 on the large valve seat 12 of the solenoid valve, and then enters the air cavity around the small valve hole Φ1 through the lower end countersunk hole 4-4 of the lower fixed iron 4 of the solenoid valve through the radial hole 9-4 on the solenoid valve sleeve 9.

[0039] When the solenoid valve is not energized, the sealing force acting on the large valve hole sealant 11 of the solenoid valve is the force of the pressure difference between the upper and lower parts of the valve hole sealant acting on the large valve hole Φ2 cross section plus the spring force. The sealing force acting on the small valve hole sealant 8 of the solenoid valve is the force of the pressure difference between the upper and lower parts of the valve hole sealant acting on the small valve hole Φ1 cross section plus the spring force. The cross section of the small valve hole Φ1 is much smaller than the cross section of the large valve hole Φ2. When the solenoid valve starts to be energized, the electromagnetic driving force acting on the solenoid valve moving iron 6 when there is an initial gap δ between the solenoid valve moving iron 6 and the fixed iron 3 on the solenoid valve is less than the sealing force acting on the large valve hole sealant 11 of the solenoid valve and greater than the sealing force acting on the small valve hole sealant of the solenoid valve. The sealing force on the glue 8 and the electromagnetic driving force make the solenoid valve moving iron 6 move upward, and the solenoid valve moving iron 6 drives the solenoid valve core 7 and the solenoid valve small valve hole sealing glue 8 to move upward until the top surface of the solenoid valve core 7 shaft shoulder 7-1 abuts against the bottom surface of the flange 9-1 on the solenoid valve sleeve 9. The solenoid valve moving iron 6 drives the solenoid valve core 7 and the solenoid valve small valve hole sealing glue 8 to move upward the first opening stroke δ1, so that the inlet end face of the small valve hole Φ1 opens an opening with a width of δ1, which is connected to the inner and outer air cavities of the solenoid valve large valve seat 12 by the flow hole 12-3 on the solenoid valve large valve seat 12, the inner cavity of the solenoid valve large valve seat 12, and the lower end countersunk hole of the solenoid valve lower fixed iron 4. 4-4, the sleeve radial hole 9-4 on the solenoid valve sleeve 9 that connects the inner and outer air cavities of the sleeve 9, and the air path from the air cavity around the small valve hole Φ1 above to the small valve hole Φ1 constitutes the air inlet channel of the small valve hole Φ1. The high-pressure gas in the air cavity around the small valve hole Φ1 above flows from the small valve hole Φ1 into the outlet hole 12-5 of the large valve seat 12 of the solenoid valve, thereby reducing the pressure difference on both sides of the inlet and outlet of the solenoid valve large valve hole sealant 11. In addition, the pressure difference on both sides of the inlet and outlet of the solenoid valve large valve hole sealant 11 acts on the force area of ​​the solenoid valve large valve hole sealant 11 due to the pressure difference on both sides of the inlet and outlet of the solenoid valve large valve hole sealant 11. Due to the opening of the small valve hole Φ1, the cross-sectional area of ​​the small valve hole Φ1 is further reduced, and the force acting on the large valve hole of the solenoid valve is further reduced. The sealing force on the sealant 11. In addition, according to the well-known theory, the driving electromagnetic force of the solenoid valve is approximately proportional to the inverse of the square of the solenoid valve movable iron stroke. Assuming that the first opening stroke δ1 of the solenoid valve movable iron 6 is half of the total stroke δ, that is, the second opening stroke "δ-δ1" of the solenoid valve movable iron 6 is also half of the total stroke δ, then the driving electromagnetic force of the solenoid valve movable iron 6 at the beginning of the second opening stroke is approximately four times the driving electromagnetic force of the solenoid valve movable iron 6 at the beginning of the total stroke δ. The inverse of the square of one-half, the electromagnetic driving force received by the solenoid valve movable iron 6 after it attracts the first opening stroke δ1, that is, at the beginning of the second opening stroke, increases significantly.After the solenoid valve moving iron 6 drives the solenoid valve core 7 and the solenoid valve small valve hole sealant 8 to move the first opening stroke δ1, the pressure difference on the inlet and outlet sides of the solenoid valve large valve hole sealant 11 is reduced, and the force area of ​​the pressure difference acting on the solenoid valve large valve hole sealant 11 is reduced, and the driving electromagnetic force applied to the solenoid valve moving iron 6 at the beginning of the second opening stroke is significantly increased. As a result of the combined effect, the driving force acting on the solenoid valve moving iron 6 is greater than the sealing force acting on the solenoid valve large valve hole sealant 11, so that the solenoid valve moving iron 6 drives the solenoid valve core 7, the solenoid valve small valve hole sealant 8, the solenoid valve sleeve 9, the solenoid valve small valve seat 10 and the solenoid valve large valve hole sealant 11 to move upward until the top surface of the solenoid valve moving iron 6 abuts against the bottom surface of the solenoid valve upper fixed iron 3, and the solenoid valve moving iron 6 drives the solenoid valve core 7, the solenoid valve small valve hole sealant 8, the solenoid valve sleeve 9, the solenoid valve small valve seat 10 and the solenoid valve large valve hole sealant 11 to move upward for the second section. The opening stroke "δ-δ1" creates an opening at the inlet end face of the large valve hole Φ2 with a width equal to the second opening stroke "δ-δ1". The larger diameter of the large valve hole Φ2 allows the inlet end face of the large valve hole to open with an opening width equal to the second opening stroke "δ-δ1", thereby achieving a greater flow capacity. Combined with the flow capacity of the small valve hole Φ1, the two-stroke solenoid valve has a large flow capacity when fully open. After the solenoid valve is de-energized, the electromagnetic force acting on the solenoid valve movable iron 6 disappears. The pressure differential force acting on the upper and lower sides of the solenoid valve large valve hole sealant 11 and the solenoid valve small valve hole sealant 8, as well as the spring force, causes the solenoid valve movable iron 6, the solenoid valve sleeve 9, the solenoid valve small valve hole sealant 8, the solenoid valve small valve seat 10, and the solenoid valve large valve hole sealant 11 to return to their seats, closing the two-stroke solenoid valve. This sets the solenoid valve's operating stroke into a two-stroke motion mechanism, enabling the two-stroke solenoid valve to reliably operate with high flow rates under high operating pressures.

[0040] In one embodiment, Figure 1As shown, the double-stroke solenoid valve includes a solenoid valve housing 1, a solenoid valve coil 2, a solenoid valve upper fixed iron 3, a solenoid valve lower fixed iron 4, a solenoid valve spring 5, a solenoid valve moving iron 6, a solenoid valve spool 7, a solenoid valve small valve hole sealant 8, a solenoid valve sleeve 9, a solenoid valve small valve seat 10, a solenoid valve large valve hole sealant 11 and a solenoid valve large valve seat 12. The solenoid valve coil 2 is installed in the solenoid valve housing 1. The upper and lower parts of the solenoid valve coil 2 are respectively provided with a solenoid valve upper fixed iron 3 and a solenoid valve lower fixed iron 4 and are riveted into a whole by the flanging of the solenoid valve housing 1. The lower end of the solenoid valve coil 2 is provided with a convex ring 2-1, and the solenoid valve lower fixed iron 4 is provided with an upper ring groove 4-1, a middle ring groove 4-2, a lower ring groove 4-3, a lower end countersunk hole 4-4 and an axial through hole 4-5. The solenoid valve coil 2 The lower end convex ring 2-1 extends into the upper ring groove 4-1 of the lower fixed iron 4 of the solenoid valve and a sealing ring is provided between the lower end convex ring 2-1 of the solenoid valve coil 2 and the upper ring groove 4-1 of the lower fixed iron 4 of the solenoid valve for sealing. The middle ring groove 4-2 of the lower fixed iron 4 of the solenoid valve is used to install the sealing ring. The solenoid valve moving iron 6 is installed in the axial through hole 4-5 of the lower fixed iron 4 of the solenoid valve. A solenoid valve spring 5 is installed between the upper fixed iron 3 of the solenoid valve and the solenoid valve moving iron 6. The solenoid valve core 7 is tightly fixed in the axial hole of the solenoid valve moving iron 6. The elastic force of the solenoid valve spring 5 pushes the solenoid valve moving iron 6 away from the upper fixed iron 3 of the solenoid valve when the coil is not energized, thereby forming a gap δ of the total stroke of the solenoid valve moving iron 6. A shaft shoulder 7-1 is provided on the solenoid valve core 7, and a radial hole is provided on the solenoid valve core 7 to connect with the solenoid valve The hollow axial hole of the core 7 is penetrated so that the upper and lower areas of the solenoid valve moving iron 6 are connected to reduce the movement resistance of the solenoid valve moving iron 6. The lower end head of the solenoid valve core 7 is solidified with the solenoid valve small valve hole sealant 8. The solenoid valve sleeve 9 is sleeved on the solenoid valve core 7. The solenoid valve sleeve 9 is provided with an upper flange 9-1, a lower flange 9-2, a lower end stop 9-3 and a sleeve radial hole 9-4 connecting the inner and outer air cavities of the sleeve 9. The upper flange 9-1 of the solenoid valve sleeve 9 is stuck above the shaft shoulder 7-1 of the solenoid valve core 7. A gap δ1 constituting the first section of the opening stroke of the solenoid valve is provided between the bottom surface of the upper flange 9-1 of the solenoid valve sleeve 9 and the top surface of the shaft shoulder 7-1 of the solenoid valve core 7. The solenoid valve small valve seat 10 is installed in the lower end stop 9-3 of the solenoid valve sleeve 9. The solenoid valve sleeve 9 The lower flange 9-2 rivets the small valve seat 10 of the solenoid valve to the solenoid valve sleeve 9, and the small valve seat 10 of the solenoid valve is provided with a small valve hole Φ1. The small valve seat 10 of the solenoid valve is provided with a large valve hole sealant 11 of the solenoid valve in the pit at the lower end of the small valve seat 10 of the solenoid valve. The lower end flange of the small valve seat 10 of the solenoid valve rivets the large valve hole sealant 11 of the solenoid valve to the small valve seat 10 of the solenoid valve. The large valve seat 12 of the solenoid valve is provided with a large valve hole Φ2, a stop 12-1, an inner convex ring 12-2, a flow hole 12-3 connecting the inner and outer air cavities of the large valve seat 12 of the solenoid valve, a radial hole 12-4 below the large valve seat 12 of the solenoid valve, an outflow hole 12-5 of the large valve seat 12 of the solenoid valve and an annular groove 12-6 in the middle of the large valve seat 12 of the solenoid valve, and the stop 12-1 of the large valve seat 12 of the solenoid valve is sleeved on the outer circle of the lower end of the lower fixed iron 4 of the solenoid valve.The inner convex ring 12-2 formed by external riveting on the large valve seat 12 of the solenoid valve is stuck in the lower ring groove 4-3 of the lower fixed iron 4 of the solenoid valve, so that the large valve seat 12 of the solenoid valve is fixed to the lower fixed iron 4 of the solenoid valve as a whole. The middle ring groove 12-6 of the large valve seat 12 of the solenoid valve is used to install the sealing ring for isolating the high and low pressure chambers. The intake air enters the inner cavity of the large valve seat 12 of the solenoid valve from the flow hole 12-3 on the large valve seat 12 of the solenoid valve, and then enters the air cavity around the small valve hole Φ1 through the lower end countersunk hole 4-4 of the solenoid valve lower fixed iron 4 through the radial hole 9-4 on the solenoid valve sleeve 9. When the solenoid valve is not energized, the sealing force acting on the large valve hole sealant 11 of the solenoid valve is the force of the pressure difference between the upper and lower sides of the valve hole sealant acting on the cross section of the large valve hole Φ2 plus the spring force, which acts on the small valve hole of the solenoid valve. The sealing force on the sealant 8 is the force of the pressure difference between the upper and lower parts of the valve hole sealant acting on the cross section of the small valve hole Φ1 plus the spring force. The cross section of the small valve hole Φ1 is much smaller than the cross section of the large valve hole Φ2. When the solenoid valve starts to be energized, the electromagnetic driving force acting on the solenoid valve moving iron 6 when there is an initial gap δ between the solenoid valve moving iron 6 and the fixed iron 3 on the solenoid valve is smaller than the sealing force acting on the sealant 11 of the large valve hole of the solenoid valve and greater than the sealing force acting on the sealant 8 of the small valve hole of the solenoid valve. The electromagnetic driving force causes the solenoid valve moving iron 6 to move upward, and the solenoid valve moving iron 6 drives the solenoid valve core 7 and the solenoid valve small valve hole sealant 8 to move upward until the top surface of the solenoid valve core 7 shaft shoulder 7-1 abuts against the bottom surface of the flange 9-1 on the solenoid valve sleeve 9, and the solenoid valve moving iron 6 drives the solenoid valve core 7 and the solenoid valve small valve hole sealant 8 to move upward until the top surface of the solenoid valve core 7 shaft shoulder 7-1 abuts against the bottom surface of the flange 9-1 on the solenoid valve sleeve 9. The valve core 7 and the solenoid valve small valve hole sealant 8 move upwards for the first opening stroke δ1, so that the inlet end face of the small valve hole Φ1 opens an opening with a width of δ1. The flow hole 12-3 on the solenoid valve large valve seat 12 connecting the inner and outer air cavities of the solenoid valve large valve seat 12, the inner cavity of the solenoid valve large valve seat 12, the lower end countersunk hole 4-4 of the solenoid valve lower fixed iron 4, the sleeve radial hole 9-4 on the solenoid valve sleeve 9 connecting the inner and outer air cavities of the sleeve 9, and the air path from the air cavity around the small valve hole Φ1 to the small valve hole Φ1 constitute the air inlet channel of the small valve hole Φ1. The high-pressure gas in the air cavity around the small valve hole Φ1 flows from the small valve hole Φ1 into the outlet hole 12-5 of the solenoid valve large valve seat 12, thereby reducing the pressure difference between the inlet and outlet sides of the solenoid valve large valve hole sealant 11. In addition, the pressure difference on both sides of the inlet and outlet of the solenoid valve large valve hole sealant 11 acts on the force area of ​​the solenoid valve large valve hole sealant 11. The cross-sectional area of ​​the small valve hole Φ1 is reduced due to the opening of the small valve hole Φ1, and the sealing force acting on the solenoid valve large valve hole sealant 11 is further reduced. In addition, it can be known from the well-known theory that the driving electromagnetic force of the solenoid valve is approximately proportional to the inverse of the square of the solenoid valve moving iron stroke. Assuming that the first opening stroke δ1 of the solenoid valve moving iron 6 is half of the total stroke δ, that is, the second opening stroke "δ-δ1" of the solenoid valve moving iron 6 is also half of the total stroke δ, then the driving electromagnetic force of the solenoid valve moving iron 6 at the beginning of the second opening stroke is approximately the inverse of the square of one-half of four times the driving electromagnetic force of the solenoid valve moving iron 6 at the initial stage of the total stroke δ.After the electromagnetic valve moving iron 6 is attracted by the first section of the opening stroke δ1, that is, at the beginning of the second section of the opening stroke, the electromagnetic driving force it receives increases significantly. After the electromagnetic valve moving iron 6 drives the electromagnetic valve core 7 and the electromagnetic valve small valve hole sealant 8 to move the first section of the opening stroke δ1, the pressure difference acting on the inlet and outlet sides of the electromagnetic valve large valve hole sealant 11 is reduced, and the force area acting on the electromagnetic valve large valve hole sealant 11 by the pressure difference is reduced, and the driving electromagnetic force received by the electromagnetic valve moving iron 6 at the beginning of the second section of the opening stroke is significantly increased. As a result of the cooperative effect, the driving force acting on the solenoid valve moving iron 6 is greater than the sealing force acting on the solenoid valve large valve hole sealant 11, so that the solenoid valve moving iron 6 drives the solenoid valve spool 7, the solenoid valve small valve hole sealant 8, the solenoid valve sleeve 9, the solenoid valve small valve seat 10 and the solenoid valve large valve hole sealant 11 to move upward until the top surface of the solenoid valve moving iron 6 abuts against the bottom surface of the solenoid valve upper fixed iron 3, and ... The seat 10 and the solenoid valve large valve hole sealant 11 move upwards for the second opening stroke "δ-δ1" so that the inlet end face of the large valve hole Φ2 opens an opening with a width of the second opening stroke "δ-δ1". The large valve hole Φ2 has a larger diameter so that the inlet end face of the large valve hole opens an opening with a width of the second opening stroke "δ-δ1" to obtain a larger flow capacity. Combined with the flow capacity of the small valve hole Φ1, the two-stroke solenoid valve has a larger flow capacity when fully opened. After the solenoid valve is powered off, it acts on The electromagnetic force on the solenoid valve movable iron 6 disappears. The pressure differential force acting on the upper and lower sides of the solenoid valve large valve hole sealant 11 and the solenoid valve small valve hole sealant 8, as well as the spring force, causes the solenoid valve movable iron 6, solenoid valve sleeve 9, solenoid valve small valve hole sealant 8, solenoid valve small valve seat 10, and solenoid valve large valve hole sealant 11 to return to their seats, closing the two-stroke solenoid valve. This sets the solenoid valve's operating stroke into a two-stroke motion mechanism, ensuring reliable operation of the two-stroke solenoid valve at high flow rates under high operating pressure.

[0041] In one embodiment, Figure 2As shown, in the double-stroke solenoid valve with the small valve hole open, when the solenoid valve starts to be energized, the electromagnetic driving force acting on the solenoid valve moving iron 6 when there is an initial gap δ between the solenoid valve moving iron 6 and the fixed iron 3 on the solenoid valve is less than the sealing force acting on the solenoid valve large valve hole sealant 11 but greater than the sealing force acting on the solenoid valve small valve hole sealant 8, the electromagnetic driving force causes the solenoid valve moving iron 6 to move upward, and the solenoid valve moving iron 6 drives the solenoid valve spool 7 and the solenoid valve small valve hole sealant 8 to move upward until the top surface of the solenoid valve spool 7 shaft shoulder 7-1 abuts against the solenoid valve sliding sleeve 9. As the valve seat 12 reaches the bottom surface of the edge 9-1, the solenoid valve moving iron 6 drives the solenoid valve core 7 and the solenoid valve small valve hole sealant 8 to move upward for the first opening stroke δ1, so that the inlet end face of the small valve hole Φ1 opens an opening with a width of δ1. The air path structure is composed of the flow hole 12-3 on the solenoid valve large valve seat 12 that connects the inner and outer air cavities of the solenoid valve large valve seat 12, the inner cavity of the solenoid valve large valve seat 12, the lower end countersunk hole 4-4 of the solenoid valve lower fixed iron 4, the radial hole 9-4 on the solenoid valve sleeve 9 that connects the inner and outer air cavities of the sleeve 9, and the air cavity around the small valve hole Φ1 above the small valve hole Φ1 to the small valve hole Φ1. The air inlet passage of the small valve hole Φ1 is formed, and the high-pressure gas in the air cavity around the small valve hole Φ1 flows from the small valve hole Φ1 into the outlet hole 12-5 of the large valve seat 12 of the solenoid valve, thereby reducing the pressure difference on both sides of the inlet and outlet air of the large valve hole sealant 11 of the solenoid valve, and the pressure difference on both sides of the inlet and outlet air of the large valve hole sealant 11 of the solenoid valve acts on the force area of ​​the large valve hole sealant 11 of the solenoid valve because the small valve hole Φ1 is opened, and the cross-sectional area of ​​the small valve hole Φ1 is reduced, which further reduces the sealing force acting on the large valve hole sealant 11 of the solenoid valve. In addition, it can be known from the known theory that the solenoid valve The driving electromagnetic force is approximately proportional to the inverse of the square of the solenoid valve moving iron stroke. Assuming that the first opening stroke δ1 of the solenoid valve moving iron 6 is half of the total stroke δ, that is, the second opening stroke "δ-δ1" of the solenoid valve moving iron 6 is also half of the total stroke δ, then the driving electromagnetic force of the solenoid valve moving iron 6 at the beginning of the second opening stroke is approximately four times the inverse of the square of one-half of the driving electromagnetic force at the initial stage of the total stroke δ of the solenoid valve moving iron 6. After the solenoid valve moving iron 6 is attracted by the first opening stroke δ1, that is, at the beginning of the second opening stroke, the electromagnetic driving force it is subjected to increases significantly.

[0042] In one embodiment, Figure 3As shown, in the double-stroke solenoid valve in the fully open state, the solenoid valve moving iron 6 drives the solenoid valve core 7 and the solenoid valve small valve hole sealant 8 to move the first opening stroke δ1, so that the pressure difference acting on the inlet and outlet sides of the solenoid valve large valve hole sealant 11 is reduced, and the force area of ​​the pressure difference acting on the solenoid valve large valve hole sealant 11 is reduced, and the driving electromagnetic force applied to the solenoid valve moving iron 6 at the beginning of the second opening stroke is significantly increased. As a result, the driving force acting on the solenoid valve moving iron 6 is greater than the sealing force acting on the solenoid valve large valve hole sealant 11, so that the solenoid valve moving iron 6 drives the solenoid valve core 7, the solenoid valve small valve hole sealant 8, the solenoid valve sleeve 9, the solenoid valve small valve seat 10 and the solenoid valve large valve hole sealant 11 to move upward until the top surface of the solenoid valve moving iron 6 abuts against the bottom surface of the solenoid valve upper fixed iron 3, and the solenoid valve moving iron 6 drives the solenoid valve core 7, the solenoid valve small valve hole sealant 8, the solenoid valve sleeve 9, the solenoid valve small valve seat 10 and the solenoid valve large valve hole sealant 1 1 moves upward by the second opening stroke "δ-δ1" to open an opening with a width of the second opening stroke "δ-δ1" on the inlet end face of the large valve hole Φ2. The larger diameter of the large valve hole Φ2 enables the inlet end face of the large valve hole to open an opening with a width of the second opening stroke "δ-δ1" to obtain a larger flow capacity. Combined with the flow capacity of the small valve hole Φ1, the two-stroke solenoid valve has a large flow capacity when fully open. After the solenoid valve is powered off, the electromagnetic force acting on the solenoid valve moving iron 6 disappears. The pressure difference force acting on the upper and lower sides of the solenoid valve large valve hole sealant 11 and the solenoid valve small valve hole sealant 8 and the spring force cause the solenoid valve moving iron 6, the solenoid valve sleeve 9, the solenoid valve small valve hole sealant 8, the solenoid valve small valve seat 10 and the solenoid valve large valve hole sealant 11 to return to their original positions and seat the two-stroke solenoid valve. In this way, the working stroke of the solenoid valve is set to a two-stroke motion mechanism, thereby realizing the reliable operation of the two-stroke solenoid valve with large flow under high working pressure.

[0043] In one embodiment, a two-stroke solenoid valve includes a solenoid valve housing 1, a solenoid valve coil 2, a solenoid valve upper fixed iron 3, a solenoid valve lower fixed iron 4, a solenoid valve spring 5, a solenoid valve moving iron 6, a solenoid valve core 7, a solenoid valve small valve hole sealant 8, a solenoid valve sleeve 9, a solenoid valve small valve seat 10, a solenoid valve large valve hole sealant 11 and a solenoid valve large valve seat 12, and is characterized in that: the solenoid valve core 7 is tightly fixed in the axial hole of the solenoid valve moving iron 6, the solenoid valve sleeve 9 is sleeved on the solenoid valve core 7, the solenoid valve small valve seat 10 is installed in the lower end stop 9-3 of the solenoid valve sleeve 9, and the lower flange 9-2 of the solenoid valve sleeve 9 rivets the solenoid valve small valve seat 10 to the solenoid valve sleeve 9. The stop 12-1 of the solenoid valve's large valve seat 12 fits over the outer diameter of the lower end of the solenoid valve's lower fixed iron 4. The internally convex ring 12-2, formed by external riveting, on the solenoid valve's large valve seat 12 is locked into the lower annular groove 4-3 of the solenoid valve's lower fixed iron 4, securing the large valve seat 12 and the solenoid valve's lower fixed iron 4 as a single unit. The solenoid valve core 7 is provided with a shoulder 7-1. A radial hole in the solenoid valve core 7 penetrates the core's axial hole, connecting the areas above and below the solenoid valve's movable iron 6. The lower end of the solenoid valve core 7 is cured with a sealant 8 for the small valve hole. The upper flange 9-1 of the solenoid valve sleeve 9 fits over the shoulder 7-1 of the solenoid valve core 7. A gap is defined between the bottom surface of the flange 9-1 of the solenoid valve sleeve 9 and the top surface of the shoulder 7-1 of the solenoid valve core 7, which constitutes the first stage of the solenoid valve's opening stroke. The air inlet passage for the small valve hole is formed by the flow hole 12-3 on the solenoid valve large valve seat 12, which connects the inner and outer air cavities of the large valve seat 12; the inner cavity of the large valve seat 12; the lower countersunk holes 4-4 of the solenoid valve lower set iron 4; the radial holes 9-4 on the solenoid valve sleeve 9, which connect the inner and outer air cavities of the sleeve 9; and the air path from the surrounding air cavity above the small valve hole to the small valve hole. The lower end of the solenoid valve core 7 is cured with solenoid valve small valve hole sealant 8. The lower end recess of the solenoid valve small valve seat 10 contains solenoid valve large valve hole sealant 11. The lower end flange of the solenoid valve small valve seat 10 rivets the solenoid valve large valve hole sealant 11 to the solenoid valve small valve seat 10.

[0044] In one embodiment, Figure 4 As shown in the structure of the lower fixed iron of the solenoid valve, the lower fixed iron of the solenoid valve is provided with an upper ring groove 4-1, a middle ring groove 4-2, a lower ring groove 4-3, a lower end countersunk hole 4-4 and an axial through hole 4-5.

[0045] In one embodiment, Figure 5As shown in the figure, in the structure of the solenoid valve large valve seat, the solenoid valve large valve seat 12 is provided with a stop 12-1, an inner convex ring 12-2, a flow hole 12-3 connecting the inner and outer air cavities of the solenoid valve large valve seat 12, a radial hole 12-4 below the solenoid valve large valve seat, a flow hole 12-5 and a ring groove 12-6 in the middle of the solenoid valve large valve seat 12.

[0046] In one embodiment, Figure 6 As shown in the structure of the solenoid valve sleeve, the solenoid valve sleeve 9 is provided with an upper flange 9-1, a lower flange 9-2, a lower end stop 9-3 and a sleeve radial hole 9-4 communicating with the inner and outer air cavities of the sleeve 9.

[0047] Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments and application fields. The above-mentioned specific embodiments are merely illustrative and instructive, and are not restrictive. A person skilled in the art, guided by this specification and without departing from the scope of protection of the claims of the present invention, may also devise various forms, all of which fall within the scope of protection of the present invention.

Claims

1. A two-stroke solenoid valve, characterized in that: It includes, The solenoid valve coil has a convex ring at its lower end; The lower fixing iron of the solenoid valve is provided at the lower part of the solenoid valve coil, and the lower fixing iron of the solenoid valve includes an axial through hole, a lower end countersunk hole located at the bottom end of the axial through hole, and an upper ring groove and a lower ring groove surrounding the axial through hole, and the convex ring extends into the upper ring groove; The solenoid valve upper fixed iron is arranged on the upper part of the solenoid valve coil. The solenoid valve coil, the solenoid valve upper fixed iron and the solenoid valve lower fixed iron form an integral structure. The bottom end of the solenoid valve upper fixed iron is provided with a recess; The electromagnetic valve moving iron is installed in the axial through hole, and the electromagnetic valve moving iron has an axial hole; A solenoid valve core is tightly fitted and fixed in the axial center hole, and the solenoid valve core includes a shaft shoulder that protrudes outward perpendicularly to the axial direction; The solenoid valve spring is installed between the fixed iron and the movable iron of the solenoid valve. One end of the solenoid valve spring is connected to the solenoid valve spool, and the other end is connected to the recess. When the solenoid valve coil is not energized, the elastic force of the solenoid valve spring pushes the movable iron of the solenoid valve away from the fixed iron of the solenoid valve to form an initial gap δ of the total stroke of the movable iron of the solenoid valve. The lower end of the solenoid valve spool is cured with a sealant for the small valve hole of the solenoid valve; The solenoid valve sleeve is sleeved on the solenoid valve core, and includes an upper flange, a lower flange, a lower end stop, and a radial hole in the sleeve that connects the inner and outer air cavities of the sleeve. The upper flange is clamped on the upper part of the shaft shoulder, and a gap δ1 is provided between the bottom surface of the upper flange and the top surface of the shaft shoulder to constitute the first opening stroke of the solenoid valve; The solenoid valve small valve seat is installed in the lower end stop and the lower flange is riveted to the solenoid valve sleeve. The solenoid valve small valve seat includes an axial small valve hole with a first diameter and a pit provided at the lower end. The solenoid valve large valve hole sealant is provided in the pit. The lower end flange of the solenoid valve small valve seat rivets the solenoid valve large valve hole sealant to the solenoid valve small valve seat; The large valve seat of the solenoid valve comprises an axial large valve hole with a second diameter, an inner convex ring and a stopper distributed along the inner wall of the large valve hole, a flow hole connecting the inner and outer air cavities of the large valve seat of the solenoid valve, a radial hole and an outflow hole below the large valve seat of the solenoid valve, the stopper is sleeved on the outer circle of the lower end of the lower fixed iron of the solenoid valve, the inner convex ring is clamped in the lower ring groove so that the large valve seat of the solenoid valve and the lower fixed iron of the solenoid valve are fixed into one body to form a solenoid valve structure, the second diameter is larger than the first diameter, the intake air enters the inner cavity of the large valve seat of the solenoid valve from the flow hole, and then enters the air cavity around the small valve hole through the radial hole of the sliding sleeve from the countersunk hole at the lower end; Wherein, the solenoid valve core further includes a hollow axial hole and a radial hole passing through the hollow axial hole; the central axes of the small valve hole and the large valve hole are coaxial.

2. The two-stroke solenoid valve according to claim 1, characterized in that: When the solenoid valve coil is not energized, the sealing force acting on the sealant of the large valve hole of the solenoid valve is the force of the pressure difference above and below acting on the large valve hole cross section plus the spring force of the solenoid valve spring. The sealing force acting on the sealant of the small valve hole of the solenoid valve is the force of the pressure difference above and below acting on the small valve hole cross section plus the spring force of the solenoid valve spring. The cross section of the small valve hole is smaller than that of the large valve hole.

3. The dual-stroke solenoid valve according to claim 1, characterized in that: The solenoid valve coil starts to be energized. When there is an initial gap δ between the solenoid valve moving iron and the fixed iron on the solenoid valve, the electromagnetic driving force acting on the solenoid valve moving iron is less than the sealing force acting on the sealant of the large valve hole of the solenoid valve, but greater than the sealing force acting on the sealant of the small valve hole of the solenoid valve. The electromagnetic driving force causes the solenoid valve moving iron to move upward, and the solenoid valve moving iron drives the solenoid valve core and the sealant of the small valve hole of the solenoid valve to move upward until the top surface of the shaft shoulder abuts against the bottom surface of the upper flange. The solenoid valve moving iron drives the solenoid valve core and the sealant of the small valve hole of the solenoid valve to move upward by the gap of the first opening stroke. δ1 opens an opening with a width of the gap δ1 on the inlet end face of the small valve hole, and the air path from the flow hole, the inner cavity of the large valve seat of the solenoid valve, the lower end countersunk hole, the radial hole of the sliding sleeve, the air cavity around the small valve hole above the small valve hole to the small valve hole constitutes the air inlet channel of the small valve hole. The high-pressure gas in the air cavity around the small valve hole above the small valve hole flows from the small valve hole into the outlet hole, thereby reducing the pressure difference on both sides of the inlet and outlet of the sealant of the large valve hole of the solenoid valve, and the force area on the sealant of the large valve hole of the solenoid valve caused by the pressure difference on both sides of the inlet and outlet of the sealant is reduced due to the opening of the small valve hole, thereby reducing the cross-sectional area of ​​the small valve hole.

4. The dual-stroke solenoid valve according to claim 1, characterized in that: After the solenoid valve moving iron attracts the gap δ1 of the first section of the opening stroke, the electromagnetic driving force it receives at the beginning of the second section of the opening stroke increases. The solenoid valve moving iron drives the solenoid valve spool and the solenoid valve small valve hole sealant to move the gap δ1 of the first section of the opening stroke, which reduces the pressure difference on the inlet and outlet sides of the solenoid valve large valve hole sealant and reduces the force area of ​​the pressure difference acting on the solenoid valve large valve hole sealant. The driving electromagnetic force received by the solenoid valve moving iron at the beginning of the second section of the opening stroke increases, making the driving force acting on the solenoid valve moving iron greater than that acting on the solenoid valve large valve hole. The sealing force on the hole sealant causes the solenoid valve moving iron to drive the solenoid valve core, the solenoid valve small valve hole sealant, the solenoid valve sleeve, the solenoid valve small valve seat and the solenoid valve large valve hole sealant to move upward until the top surface of the solenoid valve moving iron abuts against the bottom surface of the fixed iron on the solenoid valve. The solenoid valve moving iron drives the solenoid valve core, the solenoid valve small valve hole sealant, the solenoid valve sleeve, the solenoid valve small valve seat and the solenoid valve large valve hole sealant to move upward the gap δ-δ1 of the second opening stroke, and the inlet end face of the large valve hole opens an opening with a width of the gap δ-δ1 of the second opening stroke.

5. The two-stroke solenoid valve according to claim 1, characterized in that: After the solenoid valve coil is powered off, the electromagnetic force acting on the solenoid valve moving iron disappears, and the pressure difference force acting on the upper and lower sides of the solenoid valve large valve hole sealant and the solenoid valve small valve hole sealant and the spring force causes the solenoid valve moving iron, solenoid valve sleeve, solenoid valve small valve hole sealant, solenoid valve small valve seat and solenoid valve large valve hole sealant to return to their positions and close the two-stroke solenoid valve.

6. The dual-stroke solenoid valve according to claim 1, characterized in that: The solenoid valve large valve seat also includes a central annular groove of the solenoid valve large valve seat, in which a high and low pressure cavity isolation sealing ring is provided for isolating and sealing the high and low pressure cavities between the inlet and outlet.

7. The dual-stroke solenoid valve according to claim 1, characterized in that: The overall structure also includes a solenoid valve shell, the solenoid valve coil is installed in the solenoid valve shell, the upper and lower parts of the solenoid valve coil are respectively provided with a solenoid valve upper iron and a solenoid valve lower iron, and are riveted into an overall structure with the flange of the solenoid valve shell.

8. The dual-stroke solenoid valve according to claim 1, characterized in that: A middle ring groove is provided between the upper ring groove and the lower ring groove, and a sealing ring is installed in the middle ring groove for sealing.

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