CN221097019U - Proportional solenoid valve - Google Patents

Abstract

The utility model relates to the technical field of hydraulic transmission, in particular to a proportional electromagnetic valve. The proportional electromagnetic valve comprises a main valve and a pilot valve, wherein the main valve comprises a main valve core and a main valve body, a movable cavity is arranged on the main valve body along the axial direction, a liquid inlet is arranged on the side wall of the main valve body, a liquid outlet is arranged at one axial end of the main valve body, the liquid inlet and the liquid outlet are both communicated with the movable cavity, and the main valve core can enable the liquid inlet and the liquid outlet to be switched between a communicated state or a disconnected state; a liquid inlet flow channel and a liquid outlet flow channel are arranged in the main valve core, a first damping hole capable of communicating the liquid inlet with the liquid inlet flow channel is arranged on the side wall of the main valve core, a second damping hole is arranged at one end of the main valve core, which is far away from the liquid outlet, the liquid outlet flow channel is communicated with the second damping hole and the liquid outlet, and the second damping hole can be communicated with the liquid inlet flow channel through an oil liquid buffer cavity; the pilot valve is arranged at one end of the main valve close to the second damping hole, can control the opening of the second damping hole through a pilot valve core which is arranged along the axial movement, and can push the main valve core to disconnect the liquid inlet from the liquid outlet.

Description

Proportional solenoid valve

Technical Field

The utility model relates to the technical field of hydraulic transmission, in particular to a proportional electromagnetic valve.

Background

With the development of high-altitude operation equipment, the requirements on the safety and the comfort of the equipment are continuously improved, and the proportional control valve is increasingly applied to the high-altitude operation equipment. Specifically, in a load lifting hydraulic system, a proportional directional valve is generally used to lower a load, and the lowering speed is generally regulated by an opening of the proportional directional valve, but in the case of a large load change, the lowering speed is slow, and the system is unstable. The proportional reversing valves are all in the form of slide valves, the defects of the proportional direction flow control valves of the traditional slide valve structure are more and more obvious, and the slide valve sealing type structure of the proportional reversing valves is inevitably large in internal leakage and cannot be suitable for occasions requiring pressure maintaining. When the traditional slide valve structure is closed or the load is stopped, the load can be changed and cannot be kept at a certain position, and the pressure of the containing cavity cannot be well maintained under the condition of pressure maintaining.

In the prior art, taking CN107883052B as an example, a leak-free pressure compensation proportional flow valve is disclosed, so that a pressure compensation valve core is additionally arranged on the basis of using a main valve core and a pilot valve core, and the pressure compensation valve core is used for controlling the connection and disconnection of a liquid inlet and a liquid outlet. The proportional flow valve additionally provided with the pressure compensation valve core can realize leakage-free sealing of the liquid inlet and the liquid outlet, but has the advantages of more required parts, complex structure, complex assembly steps, high assembly difficulty and higher production cost.

Accordingly, there is a need for an inventive proportional solenoid valve to solve the above-described problems.

Disclosure of utility model

The utility model aims to provide a proportional electromagnetic valve so as to realize leak-free sealing of a liquid inlet and a liquid outlet, and the proportional electromagnetic valve is simple in structure, convenient to assemble and low in assembly difficulty and production cost.

To achieve the purpose, the utility model adopts the following technical scheme:

a proportional solenoid valve including a main valve and a pilot valve;

The main valve comprises a main valve core and a main valve body which are coaxially arranged, a movable cavity is axially arranged in the main valve body, a liquid inlet is formed in the side wall of the main valve body, a liquid outlet is axially formed in one axial end of the main valve body, the liquid inlet and the liquid outlet are both communicated with the movable cavity, and the main valve core is positioned in the movable cavity and can axially reciprocate so that the liquid inlet and the liquid outlet are switched between a communicating state and a disconnecting state;

A liquid inlet flow channel and a liquid outlet flow channel are axially arranged in the main valve core, a first damping hole capable of communicating the liquid inlet with the liquid inlet flow channel is formed in the side wall of the main valve core, a second damping hole is formed in one end, far away from the liquid outlet, of the main valve core, the liquid outlet flow channel is communicated with the second damping hole and the liquid outlet, and the second damping hole can be communicated with the liquid inlet flow channel through an oil liquid buffer cavity;

The pilot valve is arranged at one end of the main valve, which is close to the second damping hole, and can control the opening of the second damping hole through a pilot valve core which is movably arranged along the axial direction, and can push the main valve core to disconnect the liquid inlet from the liquid outlet.

As a preferable scheme, one end of the main valve body, which is far away from the liquid outlet, is provided with an avoidance hole;

the pilot valve core can penetrate through the avoidance hole and then extend into the second damping hole and abut against the main valve core.

Preferably, the pilot valve further comprises:

The pilot valve body is coaxially connected with the main valve, an accommodating channel is axially arranged in the pilot valve body, and the pilot valve core is movably arranged in the accommodating channel; and

And the electromagnetic assembly is used for driving the pilot valve core to move towards the direction close to the second damping hole.

Preferably, the pilot valve body includes:

The magnetic conduction sleeve is provided with openings at two axial ends, an accommodating channel is formed in the magnetic conduction sleeve, the magnetic conduction sleeve is made of copper materials by welding, and a welding basin for keeping the magnetic flux flowing through the electromagnetic assembly consistent is annularly arranged on the periphery of the magnetic conduction sleeve; and

The tail luer seal assembly is arranged at one end of the magnetic conduction sleeve, which is far away from the main valve, and is used for sealing an opening at one end of the magnetic conduction sleeve, which is far away from the main valve.

Preferably, the electromagnetic assembly includes:

The coil is sleeved on the periphery of the pilot valve body;

The armature and the push rod are fixed with the armature, the armature and the push rod are arranged in the accommodating channel, the push rod is close to the pilot valve core, and electromagnetic force generated by the coil can drive the armature and the push rod to push the pilot valve core to move towards the direction close to the second damping hole.

Preferably, the pilot valve further comprises:

The pilot valve core limiting seat is sleeved on the periphery of the pilot valve core, a guide cavity is formed between the pilot valve core limiting seat and the pilot valve core, and the pilot valve core limiting seat can be abutted with the armature to limit the armature to move towards the limit position close to the second damping hole;

And the return spring is sleeved on the periphery of the pilot valve core and is positioned in the guide cavity, and the return spring is used for driving the pilot valve core to move in a direction away from the second damping hole.

As a preferable scheme, the inner cavity surface of the main valve body, which is far away from one end of the liquid outlet, is provided with a containing groove, and when the main valve core is abutted to the inner cavity surface of the main valve body, which is far away from one end of the liquid outlet, the oil liquid buffer cavity is a space in the containing groove.

As a preferable scheme, a first blocking surface is arranged at one end of the main valve core, which is close to the liquid outlet, and the first blocking surface can gradually block the liquid outlet when the main valve core moves towards the direction, which is close to the liquid outlet;

The pilot valve core is provided with a second blocking surface at one end close to the second damping hole, and the second blocking surface can gradually block the second damping hole when the pilot valve core moves towards the direction close to the second damping hole.

Preferably, the proportional solenoid valve further includes:

The main valve body is formed with first cooperation portion along the axial one end that is away from the liquid outlet, the pilot valve is close to the one end of main valve body is provided with the second cooperation portion, first cooperation portion with the second cooperation portion is connected fixedly, first sealing member presss from both sides and establishes first cooperation portion with between the second cooperation portion.

As the preferred scheme, be provided with the throttle limit on the liquid outlet, the main valve core be close to liquid outlet one end terminal surface indent form with the arc throttling groove that the liquid outlet runner is switched on, arc throttling groove is provided with a plurality of, a plurality of arc throttling groove is followed main valve core circumference equidistant interval sets up, the throttle limit with arc throttling groove cooperatees, arc throttling groove is configured to guarantee the medium follow the flow of liquid outlet discharge with main valve core for the proportionality characteristic between the liquid outlet travel distance.

The utility model has the beneficial effects that:

According to the proportional electromagnetic valve provided by the utility model, the movable cavity is formed in the main valve body along the axial direction, the liquid inlet is formed in the side wall of the main valve body, the liquid outlet is formed in one axial end of the main valve body along the axial direction, the liquid inlet and the liquid outlet are communicated with the movable cavity, the main valve core is utilized to reciprocate in the axial direction in the movable cavity to realize the switching between the communicated and disconnected states of the liquid inlet and the liquid outlet, the liquid inlet channel and the liquid outlet channel which are formed in the axial direction are formed in the main valve core, the first damping hole for communicating the liquid inlet and the liquid outlet is formed in the side wall of the main valve core, and the second damping hole is formed in one end of the main valve core which is far away from the liquid outlet, so that the liquid outlet channel is communicated with the liquid inlet channel through the liquid buffer cavity, the opening degree of the second damping hole is controlled by utilizing the pilot valve core, and the main valve core is pushed to disconnect the liquid inlet and the liquid outlet, the effect of controlling the communication and disconnection of the liquid inlet is realized, and the sealing effect is good.

Drawings

FIG. 1 is a schematic cross-sectional view of a proportional solenoid valve provided in an embodiment of the present utility model;

FIG. 2 is a hydraulic symbol of a proportional solenoid valve provided by an embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view of a main valve provided in an embodiment of the present utility model;

FIG. 4 is a schematic cross-sectional view of a pilot valve provided by an embodiment of the present utility model;

FIG. 5 is a schematic cross-sectional view of a main spool provided by an embodiment of the present utility model;

fig. 6 is a schematic cross-sectional view of a magnetic conductive sleeve according to an embodiment of the present utility model;

FIG. 7 is an enlarged schematic view of a portion of FIG. 1 at A;

fig. 8 is a partially enlarged schematic view at B in fig. 1.

In the figure:

1000. a proportional solenoid valve;

100. A main valve; 110. a main spool; 111. a first damping hole; 112. a second damping hole; 113. arc-shaped throttling grooves; 120. a main valve sleeve; 121. a liquid inlet; 122. a liquid outlet; 130. a main valve seat; 131. avoidance holes;

200. A pilot valve; 210. a pilot spool; 211. a first pilot valve core; 212. a second pilot valve core; 220. an armature; 230. a return spring; 240. a coil; 250. a magnetic conduction sleeve; 251. welding a basin opening; 260. a permanent magnet; 270. a tail end; 280. a pilot valve core limit seat; 281. a limiting bushing; 2811. a first limit bushing portion; 2812. a second limit bushing portion; 28111. a first hole; 28112. a second hole; 290. a push rod;

300. A first seal;

400. A second seal;

500. A third seal;

600. A fourth seal;

700. And a fifth seal.

Detailed Description

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the utility model more clear, the technical scheme of the utility model is further described below by a specific embodiment in combination with the attached drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

In the prior art, in order to improve the sealing effect of the proportional solenoid valve, CN107883052B is taken as an example, which discloses a leak-free pressure compensation proportional flow valve, so that a pressure compensation valve core is additionally arranged on the basis of using a main valve core and a pilot valve core, and the pressure compensation valve core is used for controlling the connection and disconnection of a liquid inlet and a liquid outlet. The proportional flow valve additionally provided with the pressure compensation valve core can realize leakage-free sealing of the liquid inlet and the liquid outlet, but has the advantages of more required parts, complex structure, complex assembly steps, high assembly difficulty and higher production cost.

In order to solve the above-described problems, the present embodiment provides a proportional solenoid valve 1000, as shown in fig. 1 to 6. The proportional solenoid valve 1000 comprises a main valve 100 and a pilot valve 200, wherein the main valve 100 comprises a main valve core 110 and a main valve body which are coaxially arranged, a movable cavity is axially arranged in the main valve body, a liquid inlet 121 is formed in the side wall of the main valve body, a liquid outlet 122 is axially formed in one axial end of the main valve body, the liquid inlet 121 and the liquid outlet 122 are both communicated with the movable cavity, and the main valve core 110 is positioned in the movable cavity and can axially reciprocate so that the liquid inlet 121 and the liquid outlet 122 are switched between a communicating state or a disconnecting state; a liquid inlet flow channel and a liquid outlet flow channel are axially arranged in the main valve core 110, a first damping hole 111 capable of communicating the liquid inlet 121 with the liquid inlet flow channel is arranged on the side wall of the main valve core 110, a second damping hole 112 is arranged at one end, far away from the liquid outlet 122, of the main valve core 110, the liquid outlet flow channel is communicated with the second damping hole 112 and the liquid outlet 122, and the second damping hole 112 can be communicated with the liquid inlet flow channel through an oil liquid buffer cavity; the pilot valve 200 is disposed at one end of the main valve 100 near the second damping hole 112, and the pilot valve 200 can control the opening of the second damping hole 112 through a pilot valve core 210 movably disposed along the axial direction, and can push the main valve core 110 to disconnect the liquid inlet 121 from the liquid outlet 122.

According to the proportional solenoid valve 1000, the movable cavity is formed in the main valve body along the axial direction, the liquid inlet 121 is formed in the side wall of the main valve body, the liquid outlet 122 is formed in one axial end of the main valve body along the axial direction, the liquid inlet 121 and the liquid outlet 122 are guaranteed to be communicated with the movable cavity, the main valve core 110 is utilized to reciprocate in the movable cavity along the axial direction to realize the switching between the state of connection and disconnection of the liquid inlet 121 and the liquid outlet 122, the liquid inlet 121 and the liquid outlet 122 are controlled to be connected and disconnected through the opening of the liquid inlet 121 and the liquid outlet 122, the first damping hole 111 for conducting the liquid inlet 121 and the liquid inlet is formed in the side wall of the main valve core 110, and the second damping hole 112 is formed in one end of the main valve core 110 far away from the liquid outlet 122, which enables the liquid outlet 112 to be conducted with the liquid outlet 122, and guarantees that the second damping hole 112 can be communicated with the liquid inlet channel through the liquid buffer cavity, and the opening of the valve core 210 of the pilot valve 200 is utilized to control the opening of the second damping hole 112, and the main valve core 110 is pushed to disconnect the liquid inlet 121 and the liquid outlet 122.

Specifically, the aperture of the second damping hole 112 is larger than the aperture of the first damping hole 111, when the pilot valve 210 is not started and the pilot valve 210 does not block the second damping hole 112, the medium in the movable cavity enters the oil liquid buffer cavity along the first damping hole 111 and the liquid inlet pipeline, and as the aperture of the second damping hole 112 is larger than the aperture of the first damping hole 111, the medium in the buffer cavity flows back to the movable cavity along the second damping hole 112 and the liquid outlet runner, so that no pressure or extremely low pressure exists in the oil liquid buffer cavity, the pressure in the oil liquid buffer cavity is lower than the pressure in the movable cavity, and the medium drives the main valve core 110 to move towards a direction away from the liquid outlet 122, thereby realizing the effect that the medium pushes the main valve core 110 to be communicated with the liquid inlet 121 and the liquid outlet 122 when the pilot valve 200 is closed.

When the pilot valve 200 is started and the control signal of the pilot valve 200 is gradually increased, the pilot valve 210 gradually moves towards the direction close to the second damping hole 112, so that the pilot valve 210 gradually blocks the second damping hole 112, at this time, the medium entering the oil buffer cavity along the first damping hole 111 and the liquid inlet channel cannot flow back to the movable cavity along the second damping hole 112 and the liquid outlet channel, the pressure in the oil buffer cavity gradually increases, meanwhile, the pilot valve 210 still moves towards the direction close to the second damping hole 112 after completely blocking the second damping hole 112, and further pushes the main valve 110 to move towards the direction close to the liquid outlet 122 until the main valve 110 completely blocks the liquid outlet 122, no leakage or extremely low leakage between the liquid inlet 121 and the liquid outlet 122 is ensured, the actual requirement is met, the inverse proportion of the conduction degree between the liquid inlet 121 and the liquid outlet 122 is reduced along with the increase of the control signal of the pilot valve 200 and the inverse proportion is increased along with the decrease of the control signal of the pilot valve 200, and the proportion characteristic of the proportion solenoid valve 1000 is ensured.

In addition, the control mode of increasing the control signal of the pilot valve 200 to realize the blocking of the liquid inlet 121 and the liquid outlet 122 only needs to ensure the stability of the input signal of the pilot valve 200, thereby effectively improving the sealing effect of the liquid inlet 121 and the liquid outlet 122.

In addition, the proportional solenoid valve 1000 further includes a first sealing member 300, wherein a first matching portion is formed at an end of the main valve body, which is far away from the liquid outlet 122, in an axial direction, a second matching portion is disposed at an end of the pilot valve 200, which is close to the main valve body, the first matching portion is fixedly connected to the second matching portion, and the first sealing member 300 is sandwiched between the first matching portion and the second matching portion. By sandwiching the first seal 300 between the first mating portion of the main valve body and the second mating portion of the pilot valve 200, the connection tightness between the main valve body and the pilot valve 200 is ensured. In this embodiment, the first sealing member 300 is an O-shaped rubber ring, which has good elasticity, toughness, wear resistance and long service life. In other embodiments, the first sealing member 300 may be other sealing structures, which is not specifically limited in this embodiment.

Further, the main valve body includes a main valve sleeve 120 and a main valve seat 130, wherein a movable cavity is axially provided in the main valve sleeve 120, the main valve seat 130 is plugged at one end of the main valve sleeve 120 far away from the liquid outlet 122, a first matching portion is provided on the main valve seat 130, and the main valve seat 130 is connected with the pilot valve 200 in a sealing manner.

In addition, the proportional solenoid valve 1000 further includes a second sealing member 400, wherein the second sealing member 400 is sleeved on the outer circumference of the main valve housing 120, and the second sealing member 400 is used for sealing the main valve housing 120 and an external abutting member. In this embodiment, the second sealing member 400 is an O-shaped rubber ring, which has good elasticity, toughness, wear resistance and long service life. In other embodiments, the second sealing member 400 may be other sealing structures, which is not specifically limited in this embodiment.

In order to ensure the existence of the oil buffer cavity when the main valve 110 is abutted against the main valve seat 130, as shown in fig. 1, 3 and 7, the inner cavity surface of the main valve seat 130, which is close to the main valve 110, is provided with a containing groove, and when the main valve 110 is abutted against the main valve seat 130, the oil buffer cavity is a space in the containing groove. When the main valve core 110 is abutted against the main valve seat 130, the medium enters the accommodating groove along the first damping hole 111 and the liquid inlet channel, and flows back into the movable cavity along the second damping hole 112 and the liquid outlet channel, so as to ensure the conduction between the second damping hole 112 and the liquid inlet channel.

Specifically, as shown in fig. 5 and 7, one end of main valve element 110 near liquid outlet 122 is provided with a first blocking surface, which can gradually block liquid outlet 122 when main valve element 110 moves in a direction near liquid outlet 122; the end of the pilot valve core 210, which is close to the second damping hole 112, is provided with a second blocking surface, and the second blocking surface can gradually block the second damping hole 112 when the pilot valve core 210 moves towards the direction close to the second damping hole 112. It should be noted that, the first sealing surface and the second sealing surface are both conical surfaces, and when the first sealing surface with the conical surface moves in the direction of the main valve core 110 approaching to the liquid outlet 122, the first sealing surface with the conical surface gradually extends into the liquid outlet 122 and gradually seals the liquid outlet 122; when the second sealing surface with the conical surface is in the direction of the pilot valve core 210 approaching to the liquid outlet 122, the second sealing surface with the conical surface gradually extends into the second damping hole 112, and the gradual sealing of the liquid outlet 122 and the second damping hole 112 is realized by utilizing the conical structural characteristics.

Further, as shown in fig. 5, a throttling edge is disposed on the liquid outlet 122, an end surface of the main valve element 110 near the liquid outlet 122 is concaved inwards to form an arc throttling groove 113 communicated with the liquid outlet channel, the arc throttling groove 113 may be provided with a plurality of arc throttling grooves 113, the plurality of arc throttling grooves 113 are disposed at equal intervals along the circumferential direction of the main valve element 110, the throttling edge is matched with the arc throttling groove 113, and the arc throttling groove 113 is configured to ensure the proportionality characteristic between the flow rate of the medium discharged along the liquid outlet 122 and the moving distance of the main valve element 110 relative to the liquid outlet 122. Through be close to liquid outlet 122 terminal surface indent at main valve core 110 and form arc throttling groove 113 to guarantee to set up a plurality of arc throttling grooves 113 at main valve core 110 circumference equidistant interval, make arc throttling groove 113 cooperate with the throttle of liquid outlet 122, when main valve core 110 and liquid outlet 122 between the gap less, the medium is less along liquid outlet 122 exhaust flow, arc throttling groove 113 also can guarantee the medium along liquid outlet 122 exhaust flow and main valve core 110 for the proportional characteristic between the liquid outlet 122 travel distance, and then guarantee the control precision of proportional solenoid valve 1000.

Further, as shown in fig. 7, the main valve seat 130 is provided with a relief hole 131, and the pilot valve element 210 can pass through the relief hole 131 and then extend into the second damping hole 112 to abut against the main valve element 110. By arranging the avoidance hole 131 at one end of the main valve body far away from the liquid outlet 122, the pilot valve core 210 can penetrate through the avoidance hole 131 and then extend into the second damping hole 112, interference between the pilot valve core 210 and the main valve body is avoided, and normal butt joint between the pilot valve core 210 and the second damping hole 112 is ensured.

In this embodiment, the pilot valve 200 further includes a pilot valve body and an electromagnetic assembly, where the pilot valve body is coaxially connected with the main valve 100, a receiving channel is axially disposed in the pilot valve body, the pilot valve core 210 is movably disposed in the receiving channel, and the electromagnetic assembly is used to drive the pilot valve core 210 to move in a direction approaching the second damping hole 112. The pilot valve 200 drives the pilot valve core 210 positioned in the pilot valve body accommodating channel to move towards the direction close to the second damping hole 112 through the electromagnetic assembly, so that sealing butt joint of the pilot valve core 210 and the second damping hole 112 and movement of the main valve core 110 towards the position close to the liquid outlet 122 are realized, the structure is simple, and the driving effect is good.

Further, as shown in fig. 4, the pilot valve body includes a magnetic conductive sleeve 250 and a tail end sealing assembly, wherein both axial ends of the magnetic conductive sleeve 250 are open, a containing channel is formed in the magnetic conductive sleeve 250, the magnetic conductive sleeve 250 is made of copper material by welding, and a welding basin 251 for maintaining the consistency of magnetic flux flowing through the electromagnetic assembly is annularly arranged on the periphery of the magnetic conductive sleeve 250; the tail end sealing assembly is arranged at one end of the magnetic conduction sleeve 250 far away from the main valve 100, and is used for sealing an opening at one end of the magnetic conduction sleeve 250 far away from the main valve 100. The end, far away from the main valve 100, of the magnetic conduction sleeve 250 is plugged through the tail luer sealing assembly, and a welding basin 251 for keeping the magnetic flux flowing through the electromagnetic assembly consistent is annularly arranged on the periphery of the magnetic conduction sleeve 250, so that the moving distance of the pilot valve 210 and the electrified current of the electromagnetic assembly are in a certain proportional relation when the pilot valve 210 moves in the accommodating channel, and the proportional characteristic of the proportional electromagnetic valve 1000 is guaranteed.

Specifically, the welding basin 251 does not penetrate through the wall of the magnetic sleeve 250, so that the linear flatness of the force-displacement curve of the electromagnet is improved, the hysteresis of the electromagnet is reduced, and the moving distance of the pilot valve 210 and the power-on current of the electromagnetic assembly are ensured to be in a certain proportional relation when the pilot valve 210 moves in the accommodating channel, so that the proportional characteristic of the proportional electromagnetic valve 1000 is ensured.

It should be noted that the luer seal assembly includes a luer 270 and a third seal 500, wherein the luer 270 is used for sealing one end of the magnetic sleeve 250 away from the main valve 100, and the third seal 500 is sandwiched between the luer 270 and the magnetic sleeve 250. The third sealing member 500 is an O-shaped rubber ring, and the O-shaped rubber ring has good elasticity, toughness and wear resistance, and long service life, and in other embodiments, the third sealing member 500 may also be other sealing structures, and the embodiment is not limited specifically.

Specifically, the electromagnetic assembly includes a coil 240, an armature 220, and a pushrod 290 fixed to the armature 220, wherein the coil 240 is sleeved on the outer periphery of the magnetic sleeve 250, the armature 220 and the pushrod 290 are both disposed in the accommodating channel, the pushrod 290 is close to the pilot valve core 210, and electromagnetic force generated by the coil 240 can drive the armature 220 and the pushrod 290 to push the pilot valve core 210 to move towards a direction close to the second damping hole 112.

Further, the electromagnetic assembly further includes a permanent magnet 260, the permanent magnet 260 is sleeved on the outer circumference of the magnetic conductive sleeve 250, and the permanent magnet 260 is positioned at one end of the coil 240 away from the main valve 100, and the permanent magnet 260 is used for providing stable electromagnetic force.

In addition, in order to further improve the sealing effect between the battery assembly and the pilot valve body, a fourth sealing member 600 is further interposed between the magnetic sleeve 250 and the permanent magnet 260, and a fifth sealing member 700 is further interposed between the coil 240 and the magnetic sleeve 250. The fourth sealing element 600 and the fifth sealing element 700 are all O-shaped rubber rings, and the O-shaped rubber rings have good elasticity, toughness and wear resistance and long service life. In other embodiments, the fourth seal 600 and the fifth seal 700 may also adopt other sealing structures, and the embodiment is not limited in particular.

In this embodiment, the pilot valve 200 further includes a pilot valve core limiting seat 280 and a return spring 230, where the pilot valve core limiting seat 280 is sleeved on the outer periphery of the pilot valve core 210, a guiding cavity is formed between the pilot valve core limiting seat 280 and the pilot valve core 210, the pilot valve core limiting seat 280 can abut against the armature 220 to limit the armature 220 to move towards the limit position close to the second damping hole 112, the return spring 230 is sleeved on the outer periphery of the pilot valve core 210 and is located in the guiding cavity, and the return spring 230 is used to drive the pilot valve core 210 to move towards the direction far away from the second damping hole 112. The pilot valve core limiting seat 280 is arranged to limit the armature 220 to move towards the limit position close to the second damping hole 112, so that the problem of overextension of the armature 220 is avoided, and the return spring 230 is arranged to drive the pilot valve core to move towards the direction far away from the second damping hole 112, so that automatic return of the pilot valve core 210 after the coil 240 is powered off is realized.

Further, as shown in fig. 7 and 8, the pilot valve core 210 includes a first pilot valve core 211 and a second pilot valve core 212 that are connected, wherein a limiting bushing 281 is disposed in a guiding cavity of the pilot valve core limiting seat 280, the limiting bushing 281 includes a first limiting bushing portion 2811 and a second limiting bushing portion 2812 that are connected, a diameter of the first pilot valve core 211 is smaller than a diameter of the second pilot valve core 212, a first hole 28111 and a second hole 28112 that are coaxial and are communicated are formed in the first limiting bushing portion 2811, a diameter of the first hole 28111 is adapted to the first pilot valve core 211, a diameter of the second hole 28112 is smaller than a diameter of the second limiting bushing portion 2812 that is adapted to the second pilot valve core 212, one end of the return spring 230 is abutted to a radial end face of the second limiting bushing portion 2812 that is close to the second damping hole 112, and the other end of the return spring 230 is abutted to a radial end face of the main valve seat 130 that is close to the pilot valve 200.

When the pilot valve core 210 moves towards the direction approaching the second damping hole 112, the second pilot valve core 212 is abutted against the hole bottom of the second hole 28112, so that the abutment and fixation of the pilot valve core 210 and the limiting bushing 281 are realized, along with the continuous increase of the energizing current of the coil 240, the electromagnetic force exerted by the coil 240 on the armature 220 is continuously increased, the elastic restoring force of the restoring spring 230 is smaller than the electromagnetic force generated by the coil 240, and the armature 220 pushes the pilot valve core 210 and the limiting bushing 281 to integrally compress the restoring spring 230 to move towards the direction approaching the second damping hole 112.

When the energizing current of the coil 240 is reduced or stopped, the elastic restoring force of the restoring spring 230 is greater than the electromagnetic force generated by the coil 240, and the restoring spring 230 drives the limit bushing 281 and the pilot spool 210, which is abutted and fixed with the limit bushing 281, to move in a direction away from the second damping hole 112.

In addition, the outer periphery of the first pilot valve core 211 is further sleeved with an auxiliary spring, and the auxiliary spring is in a relaxed state, when the pilot valve core 210 moves to a preset position in a direction approaching the second damping hole 112, one end of the auxiliary spring can be abutted against a radial end face of the first limiting bushing portion 2811 approaching the second damping hole 112, the other end of the auxiliary spring can be abutted against a radial end face of the main valve seat 130 approaching one end of the pilot valve 200, and the auxiliary spring can provide an additional elastic restoring force, so that the proportional characteristic of the proportional solenoid valve 1000 is further ensured.

To facilitate understanding of the proportional solenoid valve 1000 provided in this embodiment, a specific operation of the proportional solenoid valve 1000 will now be described with reference to fig. 1 to 8:

1) The coil 240 is not electrified, medium enters the movable cavity along the liquid inlet 121 and is discharged along the liquid outlet 122, meanwhile, the medium sequentially passes through the first damping hole 111 and the liquid inlet pipeline to enter the oil liquid buffer cavity, the medium in the oil liquid buffer cavity flows back to the movable cavity along the second damping hole 112 and the liquid outlet pipeline, meanwhile, most of the medium directly flows out along the liquid outlet 122 from the movable cavity due to larger resistance when flowing through the first damping hole 111 and the liquid inlet pipeline, and because the first sealing surface which is a conical surface is arranged at one end of the main valve core 110, which is close to the liquid outlet 122, when most of the medium is discharged from the movable cavity along the liquid outlet 122, the medium can also exert acting force on the first sealing surface which is a conical surface and drives the main valve core 110 to move in the direction away from the liquid outlet 122, so that the communication between the liquid inlet 121 and the liquid outlet 122 is further ensured;

2) The coil 240 is electrified, the electrified current of the coil 240 is continuously increased, the armature 220 moves towards the direction approaching the second damping hole 112 under the action of electromagnetic force generated by electrifying the coil 240, and the pilot valve core 210 extends into the avoidance hole 131 of the main valve seat 130 and is in butt joint with the second damping hole 112;

3) The second blocking surface of the pilot valve core 210 gradually extends into the second damping hole 112 until the second damping hole 112 is completely blocked, and after the medium enters the oil liquid buffer cavity along the first damping hole 111 and the liquid inlet pipeline, the medium cannot flow back into the movable cavity along the second damping hole 112 and the liquid outlet management;

4) The main valve core 110 moves towards the direction close to the liquid outlet 122 under the common drive of the medium in the oil buffer cavity and the pilot valve core 210;

5) The first blocking surface on main valve element 110 gradually extends into liquid outlet 122 until liquid outlet 122 is completely blocked;

6) When the coil 240 is powered off, the return spring 230 drives the pilot valve core 210 to move towards a direction away from the second damping hole 112, the second blocking surface of the pilot valve core 210 does not block the second damping hole 112 any more, and the medium in the oil buffer cavity can flow back into the movable cavity along the second damping hole 112 and the liquid outlet pipeline again;

7) Main spool 110 moves again in a direction away from outlet port 122.

In this embodiment, the medium is oil, and in other embodiments, the medium may be other liquid, which is not limited in particular.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. A proportional solenoid valve, characterized in that,

Comprises a main valve (100) and a pilot valve (200);

The main valve (100) comprises a main valve core (110) and a main valve body which are coaxially arranged, a movable cavity is axially arranged in the main valve body, a liquid inlet (121) is formed in the side wall of the main valve body, a liquid outlet (122) is axially formed in one axial end of the main valve body, the liquid inlet (121) and the liquid outlet (122) are both communicated with the movable cavity, and the main valve core (110) is positioned in the movable cavity and can axially reciprocate so that the liquid inlet (121) and the liquid outlet (122) can be switched between a communicating state and a disconnecting state;

A liquid inlet flow channel and a liquid outlet flow channel are axially arranged in the main valve core (110), a first damping hole (111) capable of communicating the liquid inlet (121) with the liquid inlet flow channel is formed in the side wall of the main valve core (110), a second damping hole (112) is formed in one end, far away from the liquid outlet (122), of the main valve core (110), the liquid outlet flow channel is communicated with the second damping hole (112) and the liquid outlet (122), and the second damping hole (112) can be communicated with the liquid inlet flow channel through an oil liquid buffer cavity;

the pilot valve (200) is arranged at one end of the main valve (100) close to the second damping hole (112), the pilot valve (200) can control the opening of the second damping hole (112) through a pilot valve core (210) which is arranged along the axial movement, and the main valve core (110) can be pushed to disconnect the liquid inlet (121) and the liquid outlet (122).

2. The proportional solenoid valve according to claim 1, characterized in that an end of the main valve body remote from the liquid outlet (122) is provided with a relief hole (131);

The pilot valve core (210) can penetrate through the avoidance hole (131) and then extend into the second damping hole (112) to be abutted against the main valve core (110).

3. The proportional solenoid valve of claim 2, wherein the pilot valve (200) further comprises:

The pilot valve body is coaxially connected with the main valve (100), an accommodating channel is axially arranged in the pilot valve body, and the pilot valve core (210) is movably arranged in the accommodating channel; and

And the electromagnetic assembly is used for driving the pilot valve core (210) to move towards the direction approaching the second damping hole (112).

4. A proportional solenoid valve according to claim 3, wherein said pilot valve body comprises:

the magnetic conduction sleeve (250), the axial both ends of magnetic conduction sleeve (250) all open, form the accommodation channel in magnetic conduction sleeve (250), magnetic conduction sleeve (250) adopt copper material to weld and make, the periphery annular of magnetic conduction sleeve (250) is provided with and is used for maintaining the unanimous welding basin mouth (251) of magnetic flux that flows through electromagnetic assembly; and

The tail luer seal assembly is arranged at one end of the magnetic conduction sleeve (250) far away from the main valve (100), and is used for sealing an opening at one end of the magnetic conduction sleeve (250) far away from the main valve (100).

5. A proportioning solenoid valve according to claim 3 wherein said solenoid assembly comprises:

a coil (240) which is sleeved on the outer periphery of the pilot valve body;

The armature (220) and the push rod (290) are fixed with the armature (220), the armature (220) and the push rod (290) are arranged in the accommodating channel, the push rod (290) is close to the pilot valve core (210), and electromagnetic force generated by the coil (240) can drive the armature (220) and the push rod (290) to push the pilot valve core (210) to move towards the direction close to the second damping hole (112).

6. The proportional solenoid valve of claim 5, wherein said pilot valve (200) further comprises:

The pilot valve core limiting seat (280) is sleeved on the periphery of the pilot valve core (210), a guide cavity is formed between the pilot valve core limiting seat (280) and the pilot valve core (210), and the pilot valve core limiting seat (280) can be abutted with the armature (220) to limit the armature (220) to move towards the limit position close to the second damping hole (112);

And the return spring (230) is sleeved on the periphery of the pilot valve core (210) and is positioned in the guide cavity, and the return spring (230) is used for driving the pilot valve core (210) to move in a direction away from the second damping hole (112).

7. The proportioning solenoid valve of any one of claims 1-6 wherein a receiving groove is provided in an inner cavity surface of the main valve body at an end remote from the liquid outlet (122), and the oil buffer cavity is a space in the receiving groove when the main valve core (110) is abutted against an inner cavity surface of the main valve body at an end remote from the liquid outlet (122).

8. The proportional solenoid valve according to any one of claims 1 to 6, characterized in that one end of the main spool (110) near the liquid outlet (122) is provided with a first blocking surface capable of gradually blocking the liquid outlet (122) when the main spool (110) moves in a direction near the liquid outlet (122);

And a second blocking surface is arranged at one end of the pilot valve core (210) close to the second damping hole (112), and the second blocking surface can gradually block the second damping hole (112) when the pilot valve core (210) moves towards the direction close to the second damping hole (112).

9. The proportional solenoid valve of any one of claims 1-6, further comprising:

The main valve body is formed with first cooperation portion along the axial one end that is away from liquid outlet (122), the one end that is close to main valve body of pilot valve (200) is provided with the second cooperation portion, first cooperation portion with the second cooperation portion is connected fixedly, first sealing member (300) presss from both sides and establishes first cooperation portion with between the second cooperation portion.

10. The proportional solenoid valve of any one of claims 1-6, wherein a throttling edge is disposed on the liquid outlet (122), the main valve element (110) is recessed near an end surface of the liquid outlet (122) to form an arc throttling groove (113) communicated with the liquid outlet channel, the arc throttling groove (113) is provided with a plurality of arc throttling grooves (113) at equal intervals along the circumferential direction of the main valve element (110), the throttling edge is matched with the arc throttling groove (113), and the arc throttling groove (113) is configured to ensure the proportional characteristic between the flow rate of medium discharged along the liquid outlet (122) and the moving distance of the main valve element (110) relative to the liquid outlet (122).