KR102098387B1 - A solenoid valve - Google Patents

Abstract

The present invention relates to a solenoid valve, and more particularly, to a solenoid valve capable of improving airtightness and operational stability of the valve unit.
The present invention capable of achieving the above object is a housing, a solenoid driving unit disposed inside the housing; A valve unit movably disposed in the housing and operatively provided by the solenoid driving unit; It includes a sealing member disposed on the outer peripheral surface of the valve unit and blocking the inner space formed by the inside of the valve unit and the housing from the other outer space regardless of the position of the valve unit. A plunger movably provided inside the housing; It includes a valve head coupled to the plunger, the valve head is provided with a coupling hole in which the plunger is inserted and coupled, and the coupling hole is provided with at least one recess and a protrusion adjacent to the recess and protruding toward the outer circumferential surface of the plunger. It provides a solenoid valve, characterized in that.

Description

Solenoid valve {A solenoid valve}

The present invention relates to a solenoid valve, and more particularly, to a solenoid valve capable of improving airtightness and operational stability of the valve unit.

The solenoid valve includes a solenoid driving unit that generates electromagnetic force, and a valve unit that performs opening and closing operations by the solenoid driving unit.

Such a solenoid valve appears in Korea Patent Registration 10-1011641.

When such a solenoid valve is installed on the turbocharging compressor side, it serves as a bypass valve.

That is, the compressor of the turbocharger is disposed on an intake manifold for introducing fresh air, and an air control valve (throttle valve) is provided on the intake manifold to adjust the inflow amount of fresh air.

In accordance with the opening and closing operation of the air regulating valve, the pressure inside the pipe connected to the turbocharger compressor changes. Typically, when the turbocharger compressor operates, the solenoid valve closes the bypass flow passage.

During operation of the turbocharger compressor, the bypass valve is opened to communicate the inflow and discharge flow paths because the turbocharger may be shocked when the air inflow is reduced or stopped due to the closing of the air control valve.

However, when the bypass flow path is opened and closed, when the surface shape of the valve seat surface is poor and not uniform during the processing or manufacturing process, the position or arrangement in the closed state of the valve head becomes oblique and leak occurs. Therefore, there is a problem in that airtightness is compromised, and in this case, stability is also a problem.

An object of the present invention is to provide a solenoid valve capable of improving airtightness and operational stability in a closed state.

The present invention for achieving this object, the housing, and a solenoid driving unit disposed inside the housing; A valve unit movably disposed in the housing and operatively provided by the solenoid driving unit; It includes a sealing member disposed on the outer peripheral surface of the valve unit and blocking the inner space formed by the inside of the valve unit and the housing from the other outer space regardless of the position of the valve unit. A plunger movably provided inside the housing; It includes a valve head coupled to the plunger, the valve head is provided with a coupling hole in which the plunger is inserted and coupled, and the coupling hole is provided with at least one recess and a protrusion adjacent to the recess and protruding toward the outer circumferential surface of the plunger. It provides a solenoid valve, characterized in that.

The recess and the protrusion are provided in plural, and are characterized in that they are alternately arranged, and the ends of the plurality of protrusions are provided in contact with the outer circumferential surface of the plunger.

The protrusion is deformable by an external force, but when the external force is released, the shape is made of a material that is restored to its original shape, and when the valve head is relatively twisted or obliquely disposed with respect to the plunger, it contacts the plunger. It is characterized in that a portion of the protruding portion is deformed in the lateral direction, and at least a portion of the deformed region is provided to move in the recess direction.

Among the protrusions, an interface facing the outer circumferential surface of the plunger is provided in a curved or arc shape corresponding to the contour shape of the outer circumferential surface of the plunger, and both sides of the protrusion protrude and extend in the recess direction.

Further comprising a washer coupling the plunger and the valve head, the outer diameter of the washer is formed larger than the distance from the center of the coupling hole to the outermost part of the recess, when the washer is installed on the plunger, the recess and the protrusion are formed by the washer. It is characterized by being shielded.

According to the present invention, when there is a problem in the structure or surface of the valve seat, it is possible to intentionally change the relative position or arrangement of the valve head plunger, thereby maintaining airtightness between the valve seat and the valve head in all areas. Thus, it is possible to maintain operational stability.

Particularly, when the protrusion around the coupling hole is deformed under pressure by the plunger, the amount of deformation occurs in the radial and horizontal directions and does not deform up and down, while structural stability is promoted and relative arrangement between the plunger and the valve head. Can actively respond to structures and locations.

That is, it provides a buffer structure or a buffer space in which the protrusions and recesses provided at the rim of the coupling hole can cope with the above-described bad conditions. Therefore, even when the surface environment of the valve seat is poor, the airtightness and operational stability can be maintained by changing the position or arrangement of the plunger of the valve head.

In addition, the present invention can improve the opening and closing response performance of the valve by smoothing the operation of the valve unit and increasing the moving speed by canceling the pressure gradient of air as well as the magnetic force during the opening and closing operation of the bypass.

In addition, since the support portion is provided in an axial form, the external air is guided directly inside the solenoid drive, and the plunger movable space inside the solenoid drive and the valve head machining space inside the housing communicate with each other, so that the movement of air and the inside of the valve Air dispersion can be achieved quickly.

In addition, it is possible to maintain the guide performance of the valve unit while implementing weight reduction by providing a support in the form of a hollow shaft or tube fixed inside the housing.

1 is a side cross-sectional view of a solenoid valve according to the present invention.
2 is a side sectional view of a valve unit according to the present invention.
3 is a plan view and a bottom view of the valve head according to the present invention.
4 and 5 show an exploded perspective view of the valve unit according to the present invention seen from above and below.
Figure 6 is a side cross-sectional view showing a state in which the solenoid valve according to the present invention opens the bypass flow path.
7 is a side cross-sectional view showing a state in which the solenoid valve according to the present invention closes the bypass flow path.
8 shows a state in which the shape of the protrusion and the recess is deformed by contact between the plunger and the protrusion when the position of the valve head is twisted or oblique in the present invention.

The present invention can be applied to various changes and can have various embodiments, and specific embodiments will be illustrated and described in the drawings.

However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms.

The terms are used only for the purpose of distinguishing one component from other components.

For example, the second component may be referred to as a first component without departing from the scope of the present invention, and similarly, the first component may also be referred to as a second component.

The term and / or includes a combination of a plurality of related described items or any one of a plurality of related described items.

When an element is said to be "connected" or "connected" to another component, it is understood that other components may be directly connected to or connected to the other component, but other components may exist in the middle. It should be.

On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that no other component exists in the middle.

The terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention.

Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, the terms "include" or "have" are intended to indicate the presence of features, numbers, steps, actions, components, parts or combinations thereof described herein, one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

 Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings, but the same or corresponding components are assigned the same reference numbers regardless of reference numerals, and overlapping descriptions thereof will be omitted.

As shown in FIG. 1, the solenoid valve 1 according to the present invention includes a housing 10 mounted on a block (see FIG. 6, B) having a bypass passage (see FIG. 6, BP) of a turbocharger. , A solenoid drive unit 100 accommodated inside the housing 10, and a valve unit 200 that opens and closes the bypass flow path BP by reciprocating motion by the solenoid drive unit 100.

The solenoid driving unit 100 moves the valve unit 200 by generating an electromagnetic force according to a signal and a current input by an external connector.

The structure of the solenoid driving unit 100 is as follows.

It includes a core 110 located inside the housing 10, a bobbin 120 surrounding the core 110, and a coil portion 122 provided to surround the bobbin 120.

And inside the core 110, the support part 300 is provided to be fixed in the form of an axial or rod. The support part 300 movably supports and moves the valve unit 200 that moves according to the operation of the solenoid driving part 100, and reciprocates. It serves as a guide to exercise.

The core 110 includes an inner diameter portion 113 to which the support portion 300 is inserted and fixed, and a plunger 202, which is a component of the valve unit 200, is selectively inserted and defines a movable space of the plunger 202. It includes a first inner space portion 111, and a second inner space portion 112 disposed between the first inner space portion 111 and the inner diameter portion 113.

A spring 130 is partially inserted into and supported by the second inner space part 112. The spring 130 serves to provide elastic force to the valve unit 300, and when the solenoid driving unit power supply is stopped, the valve unit 300 ) To close the bypass flow path (BP).

The inner diameter of the first inner space 111 is formed larger than the second inner space 112, and the inner diameter is slightly larger than the outer diameter of the plunger 202 so that the plunger 202 can move smoothly. Gives

A portion extending from the body of the core 110 is formed around the first inner space portion 111 to form the first inner space portion 111, where magnetic force is concentrated.

A plate portion 133 is disposed under the bobbin 120 to fix them so that they can be stably positioned in the housing 10, and a through hole 133a is formed at the center thereof so that the plunger 202 can move. To form.

An extension portion 133b is formed at the rim of the through hole 133a to be spaced apart from the plunger 202 and to face the plunger 202 while facing the outer circumferential surface of the plunger 202.

As will be described later, the space between the solenoid drive unit 100 and the space between the solenoid drive unit 100 and the valve unit 200 (or the space between the solenoid drive unit 100) through the space between the extension portion 133b of the plate 133 and the plunger 202 The valve head movable space) 140 may be in communication.

The valve unit 200 includes a plunger 202 movable by the magnetic force of the solenoid drive unit 100, a bush 204 between the plunger 202 and the support 300, and one end of the plunger 202 It is provided with a valve head 210 that is fixedly coupled.

The valve head 210 is coupled to the plunger 202 by the washer 220.

The plunger 202 has a large diameter portion 202a having a large diameter and a small diameter portion 202b provided in a stepped shape at a lower end of the large diameter portion 202a and smaller in diameter than the large diameter portion 202a and inserted into the valve head 210. It includes.

The washer 220 is mounted on the small diameter portion 202b, and the upper plate of the valve head 210 is positioned between the washer 220 and the lower end of the large diameter portion 202a, that is, the stepped region. The valve head 210 is prevented from being detached from the plunger 202 by the washer 220 and can be moved like the plunger 202.

And, the bush 204 is located inside the large-diameter portion 202a and is positioned between the large-diameter portion 202a and the support portion 300 to guide vertical movement of the plunger 202 relative to the support portion 300.

The spring 130 is disposed between one end of the bush 204 and the second inner space 112 of the core 110 to provide elastic force to push the valve unit 200 outward.

The valve head 210 is provided in a cap shape and provides an open space. The side wall of the valve head 210 forms a shape surrounding the space. The valve head 210 is surrounded by a flange portion 11 of the housing and a cover 20 coupled to the housing 10.

A coupling hole (refer to FIG. 3, 210e) in which the small diameter portion 202b of the plunger 202 is inserted and coupled to the upper surface of the valve head 210 is provided, and the protrusion portion 210f around the edge of the coupling hole 210e And the recess portion 210g are alternately formed to surround the small diameter portion 202b.

In addition, the end of the protruding portion 210f has a shape that extends and protrudes toward the small diameter portion 202b. The reason for placing the protruding portion 210f and the recessed portion 210g in this way is that the position of the valve head 210 is relative to the plunger 210 when the surface of the valve seat that the lower surface of the valve head 210 touches is uneven. This is to ensure that the position of the valve head 210 and the plunger 202 is tolerated while being twisted or at an angle, while ensuring close contact with the valve seat. This will be explained in detail later.

On the other hand, the valve head 210 is moved according to the reciprocating motion of the plunger 202, in this case, the sealing between the valve head 210 and the cover 20 must be maintained.

That is, the valve head 210 must move freely while being sealed, and for this purpose, the sealing adopts a so-called lip seal structure.

The lip seal type sealing member 400 includes a first sealing portion 401 that is in close contact with the inner surface of the cover 20, a second sealing portion 402 that is in close contact with the outer circumferential surface of the valve head 210, and a first sealing portion ( 401) and the second sealing portion 402, and includes a third sealing portion 403 that is in close contact with the inlet rim extension of the cover 20.

By adopting the sealing member 400, the valve head 210 may reciprocate, but the space between the cover 20 and the valve head 210 may be sealed.

The cover 20 is fitted and fixed to the mounting groove 10a provided on one surface (lower surface or upper surface) of the housing 10.

Looking at the specific configuration of the cover 20, the first sealing portion 401 is supported while being in contact with the flange portion 11, the side wall portion 20a provided in the vertical direction and one end of the side wall portion 20a It includes a first extension portion (20b) extending in the direction of the valve unit 200 in the inner direction from the bottom (lower end).

The side wall portion 20a and the first extension portion 20b are formed to be bent in a 'b' shape.

The upper surface of the first extension portion 20b and its upper space form a seating portion or a seating area, which is an area 20c in which the third sealing part 403 is seated.

Therefore, the space surrounded by the side wall portion 20a, the first extension portion 20b, the outer circumferential surface of the valve unit 200, and the flange portion 11 forms a space in which the sealing member 400 is located.

The cover 20 includes a second extension portion 20d extending radially outward from the other end (upper portion) of the side wall portion 20a, and a mounting groove 10a direction of the housing in the second extension portion 20d. It further includes a fixing portion (20e) that is extended by being fitted into the mounting groove (10a).

Under the above configuration, the end portion of the first sealing portion 401 contacts the lower end portion of the flange portion 11 and at the same time contacts the inner peripheral surface of the side wall portion 20a of the cover 20.

Then, the second sealing portion 402 is in contact with the outer peripheral surface of the valve unit 200, the third sealing portion 403 is in contact with the bottom surface of the seating portion can be stably maintained its position.

On the other hand, when the housing 10 and the cover 20 are coupled, the part to be joined must also be sealed, and for this purpose, the auxiliary sealing members 410 and 420 in the form of an O-ring are inside the coupling structure. Is placed on.

The support part 300 is disposed along the center of the solenoid driving part 100 and the center of the valve unit 200, and is located over the area where the two components are arranged.

The support part 300 is provided in the form of a tube or a hollow shaft in which at least a portion of the empty space is formed therein, and a communication flow path 302 is formed therein.

In addition, a first opening 311 in communication with the inner space of the valve head 210 is provided at one end of the support 300.

The support 300 has a second opening 312 is formed, the second opening 312 may be provided in a form that penetrates the surface of the outer peripheral surface of the support. Also, the third opening 313 may be formed at the other end of the support 300.

Here, a plurality of second openings 312 may be formed on the outer circumferential surface of the support, and the arrangement heights may be different from each other. That is, as shown in FIG. 1, the height of one second opening 312 is formed higher (or lower) than the height of the other second opening 312, which minimizes smooth air flow and foreign matter movement ( Or prevent).

The communication passage 302 serves to communicate the first opening 311 and the second opening 312 (and / or the third opening 313), whereby the space around the valve unit 200 (in detail) Is the air pressure of the space formed by the valve head 210, and the inner space of the housing 10 (in detail, the inner space of the solenoid drive unit 100, the valve unit formed between the solenoid drive unit 100 and the valve unit 200) The pressure of the first inner space 111, which is the movable space, the movable space of the valve head 140, and the space between the solenoid driving unit 200 and the inner surface of the housing 10) may be balanced.

The reason for such a pressure equilibrium will be described later.

The position of the second opening 312 is important for smooth air communication.

To this end, when the second opening 312 is formed on the surface of the outer circumferential surface of the support part 300, the position thereof is at least one of the first inner space part 111 or the second inner space part 112 of the core 110. It is preferably formed in the region or both.

However, when the second inner space 112 is not affected by the movement of the plunger 202, air movement may be smoother.

The valve head movable space 140 is formed by a flange 11 formed at the inlet of the housing 10, a surface of the valve head 210, and a space surrounded by the plate 133 and the plunger 202.

The valve head movable space 140 communicates with the first inner space 111, which are communicated through a space between the extension portion 133b of the plate 133 and the plunger 202.

Therefore, when the air outside the valve unit 200 enters the first opening 311 and the communication passage 302, the pressure is balanced by entering the first internal space 111 and the valve unit operation space 140. Is done.

Meanwhile, the third opening 313 may be formed at the other end of the support 300 (the upper end of the support in the drawing).

In this case, a space is formed between the inner surface of the housing 10 and the core 110, and between the inner surface of the housing 10 and the yoke 125, between the inner surface of the housing 10 and the plate 133. It is also possible to communicate between the third opening 313 and the valve head movable space 140.

2 is a side cross-sectional view of a valve unit composed of a valve head 210, a plunger 202, and a washer 220.

A small diameter portion 202b of the plunger 202 is inserted into the upper portion of the valve head 210, and an upper surface portion 210b on which a lower surface (stepped surface) of the large diameter portion 202b is placed is provided.

A coupling hole 210e in which a small diameter portion 202b of the plunger 202 is inserted and coupled is provided at the center of the upper surface portion 210b, and a protrusion 210f and a recess portion 210g are provided inside the coupling hole 210e. ) Is prepared.

Then, the protruding portion 210f and the recessed portion 210g become a shape surrounding the small diameter portion 202b. In addition, a stepped portion of the lower surface of the large-diameter portion 202a of the plunger 202 may be seated on the upper edge of the coupling hole 210e.

The upper surface portion 210b is provided with an area that is inclined downward in the outer direction, and an outer end area 210c is provided in the form of a groove or recessed recess at the outer end.

By forming the weight loss region 210c, cost reduction can be achieved, and the strength can be kept constant by maintaining the thickness of the upper surface of the valve head 210 within a certain range.

A locking jaw 210a is provided on the outer circumferential surface of the extension wall portion 210d.

The locking jaw 210a is formed in a stepped shape in a state of being descended by a predetermined distance from the uppermost end of the extending wall portion 210d, and the location of the locking jaw 210a is the lower end of the flange portion (FIGS. 1 and 11). It is lower and is provided lower than the upper end portion of the first sealing portion (FIGS. 1 and 401).

The locking jaw 210a is disposed higher than the upper end portion of the second sealing portion (FIGS. 1 and 402) because the upper end portion of the second sealing portion (FIGS. 1 and 402) must be brought into contact with it.

Here, the coupling hole (FIG. 3, 210a) is covered with the upper portion by the large diameter portion 202a of the plunger 202, and the lower portion is covered by the washer 220, so that the projecting portion 210f in the upper assembly structure state or The recessed portion 210g is not visible and is shielded.

That is, the outer diameter of the washer 220 and the plunger 202 large diameter portion 202a is formed larger than the distance from the center of the coupling hole 210e to the outermost of the recess 210g, so that the washer 220 is the plunger 202 ), The recess 210g and the protrusion 210f are shielded by the washer 220 and the plunger 202.

Therefore, the radial length or width of the recess portion 210g is formed smaller than the difference between the inner diameter portion and the outer diameter portion of the washer 220, that is, the thickness of the left and right sides of the flesh, and further, the large diameter portion 202a of the plunger 202. ) Is preferably formed smaller than the thickness of the right and left of the flesh.

This is provided in the form of covering the top and bottom in order to limit the deformation of the protrusion 210f and the recess portion 210g in the horizontal direction only and in the vertical direction.

And, the lower end of the small diameter portion 202b of the plunger 202 is lowered downward than the washer 220, thereby assembling stability of the washer 220. Meanwhile, a chamfer is preferably formed on the upper edge of the inner diameter portion of the washer 220 for ease of assembly.

3 (a) is a plan view of the valve head 210 as viewed from above. 3 (b) is a bottom view looking down while the plunger 202 and the washer 220 are coupled to the valve head 210.

In addition, FIGS. 4 and 5 show an exploded perspective view of the valve head 210, the plunger 202, and the washer 220 as viewed from above and below.

3 to 5, the recess 210g and the protrusion 210f are provided in plural, and are alternately arranged, and ends of the plurality of protrusions 210f are plungers 202 ) Is preferably in contact with the outer circumferential surface of the small-diameter portion (202a) or finely spaced.

Although the quantity of the protrusions 210f and the recesses 210g is shown as five, the quantity is not limited to this, and the quantity may be changed as many as convenience.

On the other hand, the shape of the protrusion 210f is deformable by an external force, but when the external force is released, the shape is made of a material that is restored to its original shape, which is preferably the same plastic resin material as the material of the valve head 210.

Therefore, when the valve head 210 is disposed relatively twisted or obliquely with respect to the plunger 202, a part of the protrusion 210f contacting the plunger 202 is deformed in the lateral direction, and at least a part of the deformed region is It is provided to move in the direction of the set (210g).

In addition, a boundary surface facing the outer peripheral surface of the small diameter portion 202b of the plunger 202 among the protrusions 210f is provided in a curved or arc shape corresponding to the contour shape of the outer peripheral surface of the small diameter portion 202b of the plunger 202.

And, the inner end portions of both sides of the protruding portion protrude and extend in the recess direction 210g, so that the width of the protruding portion 210f becomes the maximum at the inner end portion.

In addition, the width of the recess 210g increases from the inner end to the outer end, and then decreases again. That is, both sides of the recess 210g are again recessed in a curved shape.

Therefore, it is preferable that the overall contour of the coupling hole 210e has a gear or petal shape.

This is easy when the shape of the protrusion 210f temporarily changes due to strong contact between the plunger 202 and the protrusion 210f, while the inner end of the protrusion 210f stably supports the outer circumferential surface of the plunger 202. This is to make it possible to change in the lateral direction.

 FIG. 6 is a case where the solenoid valve 1 is in an open operation, and FIG. 7 is a case where the solenoid valve 1 is in a closed operation.

When the bypass flow path BP is closed according to the closing operation of the solenoid valve 1, supercharging is performed by the turbocharger, and when the throttle valve (not shown) is closed, a back pressure is generated in the turbocharger suction area side. And, if the compressor operates unreasonably by this, the compressor may be damaged.

Therefore, in order to quickly relieve the back pressure, it is necessary to quickly communicate the suction side BP1 and the discharge side BP2, and for this purpose, the solenoid valve 1 opens the bypass flow path BP.

The operation for this is shown in FIG. 6.

6, when power is applied to the solenoid valve 1, a current flows through the coil 122, thereby generating a magnetic field.

Accordingly, the plunger 202 moves to the core 110 portion, and the valve head 210 also moves toward the inside of the housing 10 according to the movement of the plunger 202.

Although the spring 130 supports the valve unit 210 in the pushing direction, the magnetic force overcomes this, so that the valve unit 210 can move in the above direction.

In this case, if the pressure is P3, P3 is smaller than the pressure P1 of the suction side BP1 when the bypass flow path is described later, but is greater than the pressure P2 of the discharge side BP2.

This is because the pressure of the pressure P2 of the discharge side BP2 and the pressure P1 of the suction side BP1 mix, and the pressure rises rather than P2.

In this case, in a state where the pressure of the entire bypass flow path BP is changed to P3, air in the bypass flow path BP flows into the housing 10 through the communication flow path 302.

Thereby, the air pressure around the valve unit 200 (in particular, the inside of the bypass flow path and the space around the valve head) and the pressure inside the housing 10 are balanced.

Subsequently, as the magnetic force disappears, the valve unit 200 moves back away from the core 110 by the restoring force of the spring 130 to block the bypass flow path BP.

On the other hand, despite the movement of the valve unit 200, the space between the cover 20 and the valve unit 200, the sealing member 400 is installed by the sealing role of the sealing member 400 having a lip seal structure Air does not flow through.

In particular, since the second sealing portion 402 is in close contact with the outer circumferential surface of the valve head 210, the sealing function can be performed.

Through this, air communication between the inside and outside of the solenoid valve 1 is prevented through the areas other than the communication passage 302 and the first, second, and third openings 311, 312, and 313 of the support part 300, thereby preventing the air pressure gradient mentioned above. It is possible to prevent the movement of the valve unit 200 according to the obstacle.

As shown in FIG. 7, when the voltage is not applied to the solenoid valve 1, the spring 130 pushes the valve unit 200, whereby the valve unit 200 is as far as possible from the solenoid driving unit 100 State.

The valve head 210 performs a downward movement while sliding relative to the second sealing portion 402, and ultimately the locking jaw 210a provided in the valve head 210 is at the upper end of the second sealing portion 402. At the same time, the uppermost end (lowest end) of the valve head 210 is in close contact with the seat portion S formed on the bypass flow path.

When the compressor (not shown) of the turbocharger is operated, the suction side BP1 connected to the air inflow portion from the intake flow path becomes high pressure P1, and the air from the intake flow path is connected to the portion discharged after passing through the compressor. The discharge side BP2 becomes the low pressure P2.

The air of the input side BP1 is inside the housing 10 by the first opening 311, the communication passage 302, and the second opening 312 (and / or the third opening 313) formed on the support 300. Flows into

Accordingly, the first inner space 111 of the core 110 serving as a movable region of the plunger 202, the second inner space 112 thereon, and between the plate 133 and the valve head 210 The pressure in all areas inside the housing 10 such as the valve head movable space 140 becomes equal to the pressure P1 of the suction side BP1.

Further, when separate spaces are formed on the inner surface of the core 110 and the housing 10, the inner surface of the yoke 125 and the housing 10, and the inner surfaces of the plate 133 and the housing 10, the pressures of the parts are also It becomes equal to the pressure P1 of the suction side BP1.

Thereby, a pressure equilibrium state in which the pressure inside the solenoid valve 1 and the pressure on the suction side BP1 are the same is achieved.

If there is no communication flow path 302 as in the present invention, as shown in FIG. 6, in the state where the valve unit 200 is opened, the inside of the housing 100 will be at a pressure similar to or equal to atmospheric pressure, and the bypass flow path ( The pressure P3 inside BP is formed higher than the pressure inside the housing 100.

In this state, when the power applied to the solenoid driving unit 100 is also cut off, the spring 130 increases by the restoring force of the compressed spring 130, and the valve unit 200 is pushed to try to be spaced apart from the core 110.

However, there is a problem in that the pressure inside the housing is lower than the pressure of the bypass flow path BP, and thus a resistance occurs, which causes a failure in the valve unit 200 to move, or a lower closing speed.

To solve this, a spring (strong spring) having a relatively large spring stiffness coefficient (aka K value) can be used, but in this case, when opening the valve unit 200, such spring acts as a resistance.

Therefore, if there is no communication passage 302, the first opening 311, the second opening 312, and the third opening 313, the above dilemma is encountered.

However, the present invention by providing a communication flow path 302, the first opening 311, the second opening 312, the third coupling hole 313, the opening of the valve unit 200, the housing 100 inside And the pressure between the inside of the bypass valve BP may be the same.

Therefore, even when the application of power to the solenoid driving unit 100 is stopped, the resistance of the air pressure is not received, and the spring is expanded by the restoring force to push the valve unit 200 to quickly perform the closing operation of the valve unit 200. You can.

Therefore, it is possible to use a spring having an elastic modulus relatively smaller than the spring modulus to be used when there is no communication flow path.

In addition, when a spring having a relatively small elastic modulus is used, even when power is applied to the solenoid driving unit 100 as shown in FIG. 7, the resistance is relatively small, so that the valve unit 200 can be quickly opened.

On the other hand, it has been mainly described that the communication flow path 300 is installed on the support part 300, the communication flow path 300 is the housing 100 to communicate the space around the valve unit 200 and the interior space of the housing 100 It may be located in or located inside the housing 100, or may be formed in a fixed structure (cover or plate, core, yoke, etc.) coupled to the housing.

Figure 8 (a) is a valve head 210, the plane between the valve head 210 and the plunger 202 when the valve head 210 is slightly twisted or oblique with respect to the plunger 202 such that the planar view of the valve seat surface is not uniform due to foreign matter or the like. This is a change in position.

And, Figure 8 (b), in such a case, when the small diameter portion (202a) is biased to one side of the coupling hole (210e), showing that a portion of the projection portion 210f and a portion of the recess portion (210g) is deformed will be.

The valve head 210 is disposed obliquely compared to the plunger 202 vertically arranged in a strange state (indicated by a solid line), not in a normal state (indicated by a dotted line), in which the valve seat surface is flat and uniform, and free of foreign matter.

In the case of the prior art, in such an environment, the valve head is fixed to the plunger and is not positioned obliquely, so it is upright, so that the rest of the valve head apart from the valve seat facing the protruding valve seat is spaced apart from the valve seat. As a result, airtightness is impaired and operation problems occur.

However, the present invention intentionally enables a relative position change or an arrangement state change, thereby maintaining airtightness between the valve seat and the valve head in all areas, thereby maintaining operational stability.

Here, 202b means the relative position of the plunger small diameter portion 202b with respect to the valve head 210 in the normal case, and 202b 'means the relative position of the plunger small diameter portion with respect to the valve head 210 in the abnormal case.

In this case, the center of the plunger 202 and the center of the coupling hole 210e are inconsistent, and the plunger 202 is pushed toward one side of the coupling hole 210e, so that the protrusion 210f of the biased portion is biased. Is transformed.

Here, 210f and 210g denote the contours of the projections and recesses in the normal state before being subjected to pressure, and 210f 'and 210g' denote the deformed projections and the recesses around them under pressure.

When the protrusion is deformed, since the amount of deformation occurs in the radial and horizontal directions and does not deform up and down, it is possible to actively respond to the relative arrangement structure and position between the plunger and the valve head, while achieving structural stability.

That is, it provides a buffer structure or a buffer space in which the protrusions and recesses provided at the rim of the coupling hole can cope with the above-described bad conditions. Therefore, even when the surface environment of the valve seat is bad, the position or arrangement of the plunger 202 of the valve head 210 changes, so that airtightness and operational stability can be maintained.

As described above, the present invention has been described with reference to embodiments shown in the drawings, but this is only for explaining the invention, and those skilled in the art to which the present invention pertains have various modifications from the detailed description of the invention. Or it will be understood that equivalent embodiments are possible.

Therefore, the true scope of the present invention should be determined by the technical spirit of the claims.

100: solenoid drive 110: core
111: first internal space 140: valve head movable space
200: valve unit 202: plunger
210: valve head 210a: locking jaw
210b: upper surface portion 210e: coupling hole
210g: recess 210f: protrusion
300: support

Claims (5)

Housing,
A solenoid driving unit disposed inside the housing;
A valve unit movably disposed in the housing and operatively provided by the solenoid driving unit;
It is disposed on the outer peripheral surface of the valve unit and includes a sealing member that blocks the inner space formed by the inside of the valve unit and the housing from the other outer space regardless of the position of the valve unit,
The valve unit includes a plunger movably provided inside the housing according to whether the solenoid driving unit is operated; It includes a valve head coupled to the plunger,
The valve head is provided with a coupling hole through which the plunger is inserted and coupled,
The engaging hole is provided with at least one recess and a protrusion adjacent to the recess and projecting in the direction of the outer circumferential surface of the plunger,
The recess and the protrusion are provided in a plurality, characterized in that they are alternately arranged, the ends of the plurality of protrusions are provided to contact the outer peripheral surface of the plunger,
The protrusion is deformable in shape by external force, but when the external force is released, the shape is made of a material that is restored to its original shape.
When the valve head is relatively twisted or obliquely disposed with respect to the plunger, a portion of the protrusion contacting the plunger is deformed in the lateral direction, and at least a portion of the deformed region is provided to move in the recess direction,
The boundary surface facing the outer peripheral surface of the plunger among the protrusions is provided in a curved or arc shape corresponding to the contour shape of the outer peripheral surface of the plunger,
Both sides of the protrusion protrude and extend in the recess direction,
The plunger has a large-diameter portion and a small-diameter portion, and the small-diameter portion is inserted into the coupling hole of the valve head, and the lower surface of the large-diameter portion is placed on the upper surface of the valve head, and is disposed to cover the protrusions and recesses,
Further comprising a washer installed at the end of the small diameter portion of the plunger to engage the plunger and the valve head,
The outer diameter of the washer and the outer diameter of the plunger large diameter portion are formed larger than the distance from the center of the coupling hole to the outermost part of the recess, and when the washer is installed on the plunger, the recess and protrusion are shielded by the large diameter portion of the washer and plunger. Solenoid valve. delete delete delete delete

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