High speed solenoid valve

Abstract

The invention discloses a high-speed solenoid valve, comprising: the tail of the valve core is pressed against the return spring through a spring seat, the spring seat is provided with a throttling hole, the throttling hole divides the low-pressure chamber into a front chamber and a rear chamber, the fluid acts on the valve core from the front to the rear through the front chamber, and the fluid acts on the valve core from the rear to the front through the rear chamber, the magnetic gap and the annular flow gap. The cone angles of the valve core sealing cone surface and the valve seat sealing cone surface of the invention are different, and a sealing belt is formed when the two are in contact, and the sealing belt makes the areas of the fluid pressure on the front and rear ends of the valve core completely equal, so that the opening force of the valve core is not affected by the size of the fluid pressure. At the same time, since the throttling hole is set on the spring seat, the force on the valve core is unbalanced at the moment of opening and closing the valve core, and this unbalanced force is more conducive to accelerating the opening and closing of the valve core, thereby improving the response ability of the valve, and is particularly suitable for high-speed control of large-flow liquid or large-flow gas.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic valves, and in particular to an electromagnetic valve capable of high-speed response. Background Art

[0002] For high-speed solenoid valves, the unbalanced force generated by the fluid pressure increases with the increase of the valve core size and will seriously affect the movement of the valve core. Therefore, the valve core diameter of the known high-speed solenoid valve cannot be too large, that is, the flow rate is very small.

[0003] In order to improve the response speed of the valve under the condition of large flow, Chinese invention patent CN103256267A discloses a hydraulic high-speed digital valve, including a valve body and a valve core slidably installed in the valve body, one end of the valve core is provided with a sealing surface and cooperates with the sealing surface in the valve body to form a sealing interface, and the two sides of the sealing interface are respectively provided with an oil inlet channel and an oil outlet, the oil inlet channel is located between the valve body and the valve core and surrounds the valve core, so that the combined force of the hydraulic oil inlet on the valve core in the closed state of the digital valve is zero, and the oil outlet is located at one end of the valve body. The oil outlet pressure is transmitted to the pressure balance chamber through the channel, and the combined axial force on the valve core is zero. Therefore, the design of the valve core size is no longer limited by the hydraulic pressure, and a large-flow digital valve can be realized, and rapid response can be achieved under the action of electromagnetic force and spring force.

[0004] The digital valve still has the following aspects to be improved: 1) the electromagnet and the electromagnetic coil are both located at the end of the valve body, and the electromagnetic efficiency is low; 2) the valve body and the valve core are sealed by face contact, which is difficult to process. As the contact surface wears unevenly, it is easy to have problems with poor closure; and the face contact sealing surface causes the area of ​​the hydraulic oil in the oil outlet acting on the valve core in the closing direction when the valve is closed to be larger than the area in the opening direction. The resultant force of the hydraulic oil on the valve core in the moving direction is not zero, which will generate a force to close the valve core, restricting the movement of the valve core or even preventing it from opening. Therefore, this structure can only be used in hydraulic controls with low outlet pressure, and its use is limited.

[0005] In a hydraulic high-speed digital valve with a solenoid valve in the middle, the above technical problems are solved to a certain extent, which includes a valve body and a valve core slidably installed in the valve body, the rear end of the valve core is provided with a cylindrical movable armature, and a fixed armature is installed in the valve body behind the movable armature, and the valve body includes a front valve body, a rear valve body, and a spacer sleeve arranged between the front valve body and the rear valve body, the front valve body and the rear valve body are made of magnetic conductive materials, and the spacer sleeve is made of magnetic isolation material; the interface between the fixed armature and the movable armature is located in the covering area of ​​the spacer sleeve; and an annular coil assembly is sleeved on the outer side of the valve body. The electromagnetic coil is located in the middle section of the valve body, and the overall structure is more compact; the position of the fixed armature can be easily adjusted, so as to fine-tune the gap between the fixed and movable armatures; the conical surface with different inclination angles at the junction of the valve core and the valve body ensures that the valve core is balanced in force while improving the sealing effect, which can avoid leakage caused by uneven wear of the sealing surface.

[0006] Chinese invention patent CN104913099A also discloses a similar structure.

[0007] However, as the practice progressed, the following problems were discovered: 1) There is a clearance fit between the valve core guide surface and the valve sleeve, and fluid leakage may occur through the clearance; 2) There is still room for improvement in the response speed of the valve core. Summary of the invention

[0008] In view of the above shortcomings of the prior art, the present invention provides a high-speed solenoid valve to increase the response speed of the valve core.

[0009] In order to solve the above technical problems, a high-speed solenoid valve of the present invention comprises: a valve body, wherein the valve body comprises a front valve body and a rear valve body, the rear valve body is connected to a rear valve body end cover, and the rear valve body end cover is fixedly connected to the front valve body; the front valve body is provided with a fluid inlet and a fluid outlet, and a valve seat portion and a valve core mounting hole are provided in the front valve body; a valve core, wherein the valve core and the valve core mounting hole are slidably matched, the head of the valve core is provided with a valve core sealing cone surface, the valve seat portion is provided with a valve seat sealing cone surface, the cone angles of the valve core sealing cone surface and the valve seat sealing cone surface are different, and a sealing belt is formed when the two are abutted, the valve core is provided with an axial through hole, the axial through hole is communicated with the fluid outlet, and the sealing belt divides the valve body into a high-pressure area communicated with the fluid inlet and a low-pressure chamber communicated with the fluid outlet; a moving armature, a static armature and an electromagnetic coil, the moving armature is fixed to the tail of the valve core, and the static armature is fixed to the tail of the valve core. The rear valve body is fixed, a spring sleeve is sleeved in the inner hole of the static armature, a return spring is arranged in the spring sleeve, a magnetic isolation ring is arranged in the inner hole of the electromagnetic coil, and the rear valve body, the rear valve body end cover and the magnetic isolation ring surround the electromagnetic coil; the movable armature extends into the inner hole of the magnetic isolation ring through the central hole of the rear valve body end cover, and the static armature extends into the inner hole of the magnetic isolation ring from the other end, and the two end faces are opposite, leaving a magnetic gap in the middle, and an annular flow gap is provided between the movable armature and the inner hole of the rear valve body end cover and the inner hole of the magnetic isolation ring; the tail of the valve core is pressed against the return spring through a spring seat, and a throttling hole is opened on the spring seat, and the throttling hole divides the low-pressure chamber into a front chamber and a rear chamber, and the fluid applies pressure to the valve core from front to rear through the front chamber, and the fluid applies pressure to the valve core from rear to front through the rear chamber, the magnetic gap and the annular flow gap.

[0010] Preferably, a shaft sealing device is provided between the guide surface of the valve core and the valve body.

[0011] Preferably, the shaft sealing device is a sealing ring.

[0012] After adopting the above technical scheme, the technical effect of the present invention is that the head of the valve core is provided with a valve core sealing cone surface, and the valve seat is provided with a valve seat sealing cone surface. The cone angles of the valve core sealing cone surface and the valve seat sealing cone surface are different, and a sealing belt is formed when the two are in contact with each other. This sealing belt makes the areas of fluid pressure on the front and rear ends of the valve core completely equal, so that the opening force of the valve core is not affected by the magnitude of the fluid pressure. At the same time, since a throttling hole is provided on the spring seat, the force on the valve core is unbalanced at the moment of opening and closing the valve core. This unbalanced force is more conducive to accelerating the opening and closing of the valve core, thereby improving the response ability of the valve, which is particularly suitable for high-speed control of liquid or gas.

[0013] In addition, a shaft sealing device is provided between the guide surface of the valve core and the valve body to prevent fluid leakage between the guide surface of the valve core and the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 2 is a structural cross-sectional view of a high-speed solenoid valve embodiment 1 of the present invention;

[0015] Figure 2 yes Figure 1 A partial enlarged view of position II in the middle;

[0016] Figure 3 yes Figure 1 A partial enlarged view of point I in the middle;

[0017] Figure 4 It is a structural cross-sectional view of a high-speed solenoid valve embodiment 2 of the present invention;

[0018] Figure 5 is with Figure 4 A partial enlarged view of the part III in the middle;

[0019] In the figure, 1-front valve body, 2-valve core, 3-rear valve body end cover, 4-rear valve body, 5-electromagnetic coil, 6-magnetic isolation ring, 7-static armature, 8-spring sleeve, 9-return spring, 10-spring seat, 101-throttle hole, 11-moving armature, 12-fluid outlet, 13-fluid inlet, 14-sealing ring, 1a-valve seat sealing cone surface, 2a-valve core sealing cone surface, 1b-valve seat sealing cone surface, 2b-valve core sealing cone surface, t-magnetic gap, A-front cavity, B-rear cavity. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0021] For the convenience of description, the side where the electromagnetic coil is provided is defined as "rear", and the opposite side is defined as "front".

[0022] Example 1

[0023] like Figure 1 As shown, a high-speed solenoid valve, a valve body of a digital valve comprises a front valve body 1 and a rear valve body 4 , the rear valve body 4 is connected to a rear valve body end cover 3 , and the rear valve body end cover 3 is fixedly connected to the front valve body 1 .

[0024] The front valve body 1 is provided with a fluid inlet 13 and a fluid outlet 12 . The fluid outlet 12 is located at the end of the front valve body 1 , and the fluid inlet 13 is located at the peripheral wall of the front valve body 1 .

[0025] A valve seat and a valve core mounting hole are provided in the front valve body 1. The valve core 2 is slidably matched with the valve core mounting hole, and a sealing ring 14 is provided between the guide surface of the valve core 2 and the valve body 1. The sealing ring 14 is a shaft sealing device to prevent fluid leakage between the guide surface of the valve core and the valve body.

[0026] like Figure 3 As shown, the head of the valve core 2 is provided with a valve core sealing cone 2a, and the valve seat is provided with a valve seat sealing cone 1a. The cone angles of the valve core sealing cone 2a and the valve seat sealing cone 1a are different, and a sealing band is formed when the two are in contact. The valve core 2 is provided with an axial through hole, which is connected to the fluid outlet 12. The sealing band separates the valve body into a high-pressure area connected to the fluid inlet 13 and a low-pressure chamber connected to the fluid outlet 12. The function of this sealing band is to make the areas of the fluid pressure at the front and rear ends of the valve core 2 completely equal, so that the opening force of the valve core 2 is not affected by the pressure of the controlled fluid.

[0027] like Figure 1 and Figure 2 As shown together, the moving armature 11 is fixed to the tail of the valve core 2, the static armature 7 is fixed to the rear valve body 4, the inner hole of the static armature 7 is sleeved with a spring sleeve 8, a return spring 9 is arranged in the spring sleeve 8, and a magnetic isolation ring 6 is arranged in the inner hole of the electromagnetic coil 5, the magnetic isolation ring 6 is made of magnetic isolation metal material, and the rear valve body 4, the rear valve body end cover 3 and the magnetic isolation ring 6 surround the electromagnetic coil 5.

[0028] The moving armature 11 extends into the inner hole of the magnetic isolation ring 6 through the center hole of the rear valve body end cover 3, and the static armature 7 extends into the inner hole of the magnetic isolation ring 6 from the other end. The two end faces are opposite to each other, and a magnetic gap t is left in the middle. One function of the magnetic gap t is to provide a travel space for the valve core 2, and the other function is a channel for the fluid, which will be mentioned in the following description.

[0029] The tail of the valve core 2 is pressed against the return spring 9 through the spring seat 10. The spring seat 10 is provided with a throttle hole 101. The throttle hole 101 separates the low-pressure chamber into a front chamber A and a rear chamber B. The throttle hole 101 is different from a general through-flow hole. Its function is to produce a throttling effect on the fluid flowing through. At the moment of valve opening and closing, the fluid pressures of the front chamber A and the rear chamber B are different, thereby generating a pressure difference on the valve core and accelerating the opening and closing of the valve. There is an annular flow gap between the movable armature 11 and the inner hole of the rear valve body end cover 3 and the inner hole of the magnetic isolation ring 6. The fluid exerts pressure on the valve core 2 from front to back through the front chamber A, and the fluid exerts pressure on the valve core 2 from back to front through the rear chamber B, the magnetic gap t and the annular flow gap.

[0030] In order to facilitate the description of the working principle of the present invention, the fluid pressure of the front chamber is set to PA, the fluid pressure of the rear chamber B is set to PB, and the fluid pressure of the high-pressure area is set to P1.

[0031] In the power-off state of the valve, the valve core 2 is in the closed state under the action of the return spring 9. At this time: PA = PB, P1 > PA, P1 > PB. Since the areas of the fluid pressures at both ends of the valve core 2 are exactly equal, the resultant force of the fluid pressure on the valve core is 0.

[0032] When the valve is powered on, under the action of the electromagnetic force, the valve core 2 moves backward. At the moment when the valve core 2 is opened, the fluid jets from the high-pressure area to the front chamber A of the low-pressure chamber, and the pressure PA increases. Due to the function of the throttle hole 101, at this time, the pressure PB in the rear chamber B changes little, PA > PB, and the fluid pressure at the front end of the valve core 2 is greater than the fluid pressure at the rear end. Under the combined action of the fluid pressure and the electromagnetic force, the valve core 2 is pushed to move backward rapidly, greatly increasing the opening speed. After the valve is fully opened, the fluid pressure is conducted from the front chamber A to the rear chamber B through the throttle hole 101. At this time: PA = PB.

[0033] When the valve is powered off, under the action of the spring force, the valve core 2 starts to move in the direction of the front end. At the moment of movement, the pressure PA in the front chamber A starts to decrease. Due to the function of the throttle hole 101, the pressure PB in the rear chamber B changes little. At this time, PA < PB, and the fluid pressure at the rear end of the valve core 2 is greater than the front end. Under the combined action of the fluid pressure and the spring force, the valve core closes rapidly. After the valve is fully closed, the pressures in the front chamber A and the rear chamber B are balanced, PA = PB.

[0034] Embodiment 2

[0035] As Figure 4 shown, the structure of this embodiment is basically the same as that of Embodiment 1, except for the sealing structure between the valve core and the valve seat. In this embodiment, as Figure 5 shown, the apex of the valve seat sealing cone surface 1a abuts against the valve core sealing cone surface 2a, while Figure 3 in

[0036] it is the apex of the valve core sealing cone surface 2a that abuts against the valve seat sealing cone surface 1a. The structure of this embodiment is usually designed as a valve in the normally open state, and the structure of Embodiment 2 is usually designed as a valve in the normally closed state. The present invention is not limited to the above embodiments. All kinds of improvements made based on the concept, principle, structure and method of the present invention will fall within the protection scope of the present invention.

Claims

1. A high-speed solenoid valve, comprising: A valve body, the valve body comprising a front valve body and a rear valve body, the rear valve body being connected to a rear valve body end cover, the rear valve body end cover being fixedly connected to the front valve body; the front valve body being provided with a fluid inlet and a fluid outlet, the front valve body being provided with a valve seat portion and a valve core mounting hole; A valve core, wherein the valve core is slidably matched with the valve core mounting hole, the head of the valve core is provided with a valve core sealing cone surface, the valve seat portion is provided with a valve seat sealing cone surface, the valve core sealing cone surface and the valve seat sealing cone surface have different cone angles, and a sealing belt is formed when the two are in contact with each other, the valve core is provided with an axial through hole, the axial through hole is communicated with the fluid outlet, and the sealing belt separates the valve body into a high-pressure area communicated with the fluid inlet and a low-pressure chamber communicated with the fluid outlet; A moving armature, a stationary armature and an electromagnetic coil, wherein the moving armature is fixed to the tail of the valve core, the stationary armature is fixed to the rear valve body, a spring sleeve is sleeved in the inner hole of the stationary armature, a return spring is arranged in the spring sleeve, a magnetic isolation ring is arranged in the inner hole of the electromagnetic coil, the rear valve body, the rear valve body end cover and the magnetic isolation ring surround the electromagnetic coil; the moving armature extends into the inner hole of the magnetic isolation ring through the central hole of the rear valve body end cover, and the stationary armature extends into the inner hole of the magnetic isolation ring from the other end, the two end faces are opposite, and a magnetic gap is left in the middle, and an annular flow gap is provided between the moving armature and the inner hole of the rear valve body end cover and the inner hole of the magnetic isolation ring; it is characterized in that, The tail of the valve core is pressed against the return spring through a spring seat, the spring seat is provided with an outer spherical surface and a throttling hole is opened in the axial direction, the axial through hole forms an inner tapered hole at the tail of the valve core, the inner tapered hole cooperates with the outer spherical surface, the throttling hole divides the low-pressure chamber into a front chamber and a rear chamber, the fluid acts on the valve core from front to rear through the front chamber, and the fluid acts on the valve core from rear to front through the rear chamber, the magnetic gap and the annular flow gap; A shaft sealing device is arranged between the guide surface of the valve core and the valve body.

2. The high-speed solenoid valve according to claim 1, characterized in that: The shaft sealing device is a sealing ring.

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