JPH0740137Y2 - solenoid valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a solenoid valve used, for example, in various hydraulic / pneumatic control devices.

(Prior Art) Conventionally, as this type of solenoid valve, for example, there is one as shown in FIG. That is, 100 is a cylindrical solenoid, and the center post 101 is attached to the upper part on the inner peripheral side. The solenoid 100 is attached to a hollow inner valve casing 102, while a valve seat 103 is attached to an end of the valve casing 102 opposite to the solenoid 100. Center post 101
A valve element 104 is reciprocally mounted between the valve seat 103 and the valve seat 103 in the axial direction of the center post 101. A spring 105 that presses the valve body 104 against the valve seat 103 to close the valve is provided between the valve body 104 and the center post 101. By energizing and energizing the solenoid 100, the valve body 1
04 is sucked to the center post 101 to open the flow path, the power is cut off, and the valve body 104 is pushed back by the spring force of the spring 105 to close the flow path. The flow rate is controlled by sending a periodic electric signal to the solenoid 100 to intermittently open and close the flow path. The flow rate is proportional to the ratio (duty ratio) between the time T _{2 of} one pulse and the cycle T ₁ .

(Problems to be solved by the invention) However, in the case of such a conventional technique, the valve body 10 is opened and closed.
Since it was done by reciprocating 4
A striking sound is generated when the vehicle collides with the center post 101 and the valve seat 103. Especially when electromagnetically attracted, the valve body 104
Is generated when the center post 101 collides with the center post 101. Further, in the case of the type in which the flow path is opened and closed intermittently, the impact sound is generated intermittently and the noise level increases. There was a problem.

The present invention has been made to solve the above-mentioned problems of the prior art. The purpose of the present invention is to provide an electromagnetic valve capable of rotating a valve body to open and close a flow passage, and thus to provide a valve body and a center. It is to prevent the generation of tapping sound between posts.

(Means for Solving the Problems) In order to achieve the above object, the present invention has a center post and a solenoid surrounding the center post, and a valve is provided by exciting / de-exciting the solenoid. In a solenoid valve that moves a body to open and close a flow path, the valve body is made of a non-magnetic material with a magnetic material embedded in a part, and moves in the rotation direction and the axial direction between the center post and the valve seat. It is possible to open and close the flow path by rotating the valve body by exciting the solenoid to magnetically attract the magnetic material portion, and to phase the attraction portion of the center post and the magnetic material in the rotational direction. Is provided so as to be displaced, and biasing means for biasing the valve body to rotate in the valve closing direction and biasing the valve body against the valve seat is provided. Urging force and the solenoid It is characterized in that the valve element is held in a floating state between the center post and the valve seat by balancing the axial magnetic attraction force.

(Operation) Then, by exciting the solenoid, the magnetic body portion is magnetically attracted to rotate the valve body to open the valve. At the time of this valve opening, the urging force of the urging means for urging the valve body against the valve seat is balanced with the axial magnetic attraction force of the solenoid to move the valve body between the center post and the valve body. The valve body does not collide with the center post and the valve seat because it is held in a floating state in between.

(Example) Below, this invention is demonstrated based on the Example shown in figure. 1 to 4 showing an electromagnetic valve according to an embodiment of the present invention, reference numeral 1 denotes a cylindrical solenoid, which is mounted on an inner circumference of a housing 3 attached to one end of a valve box 2. . A magnetic center post 4 is fitted on the inner circumference of the solenoid 1, and a valve seat 5 as a valve seat is attached to the other end of the valve box 2. The valve box 2 is hollow inside, and a valve chamber S is formed inside the hollow.

A valve body 6 is rotatably interposed between the valve seat 5 and the center post 4. The valve body 6 is a flat columnar shape made of a non-magnetic material such as resin, and is arranged with its center axis O ₁ offset from the center axis O ₂ of the center post 4 by a predetermined amount. That is, a circular recess 7 into which the valve body 6 is fitted is provided on the end surface of the valve seat 5 on the valve chamber S side.
The depth of the recess 7 is substantially the same as the thickness of the valve body 6, and the inner diameter of the recess 7 is slightly larger than the outer diameter of the valve body 6 so that the valve body 6 can rotate. A seal member 10 is provided between the outer circumference of the valve body 6 and the inner circumference of the recess 7.

A magnetic body 61 is partially embedded in the valve body 6. The magnetic body 61 is a plate-shaped body extending in the diameter direction of the valve body 6, and both upper and lower end surfaces thereof are exposed at both end surfaces of the valve body 6. Further, the valve body 6 has a through hole 8 at a position offset from its center.
Has been drilled. The passage is opened by overlapping the through hole 8 and the inflow port P ₁ provided in the valve seat 5.

On the other hand, at the end of the center post 4 on the valve chamber S side, a protrusion 41 is provided as a suction part for sucking a magnetic body 61 portion whose tip extends to a position near the valve body 6. When the solenoid 1 is excited, the protrusion 41 is also excited, and the magnetic body 61 portion provided on the valve body 6 is magnetically attracted to rotate the valve body 6 to a position where the magnetic body 61 faces the protrusion 41. It will be. Thus, the position where the magnetic body 61 faces the protruding portion 41 of the center post 4 becomes the valve opening position A, and the through hole 8 of the valve body 6 is formed.
Overlaps with the inflow port P ₁ provided in the valve seat 5.

A taper spring 9 as a biasing means is contracted between the valve body 6 and the solenoid 1 and the center post 4, and the valve body 6 is constantly pressed against the valve seat 5 by its spring force. The spring force in the pressing direction balances the axial magnetic attraction force of the solenoid 1 when the valve is opened when the solenoid 1 is excited. Further, one end of the taper spring 9 is locked in a locking hole 62 provided in the valve body 6 so as to position the valve body 6 in the rotation direction. That is, when the solenoid 1 is energized and the valve body 6 is in the valve opening position A, the taper spring 9 is twisted. Therefore, when the solenoid 1 is de-energized, the valve body 6 returns to its original position due to the torsion spring force of the taper spring 9, and the through hole 8 provided in the valve body 6 is inserted into the inlet port.
It separates from P ₁ and the inlet P ₁ is blocked. The position of the valve body 6 becomes the valve closing position B.

In the solenoid valve having the above configuration, when the solenoid 1 is not energized, the valve body 6 is in the valve closing position B, and the valve body 6 is pressed against the valve seat 5 by the axial biasing force of the taper spring 9. The inflow port P ₁ provided in the valve seat 5 is closed to block the flow of fluid.

On the other hand, during energization, the spring force in the pressing direction of the taper spring 9 and the axial magnetic attraction force of the solenoid 1 are in balance, so that the center post 4 is excited by the solenoid 1 and is provided at one end thereof. The magnetic body 61 portion of the valve body 6 is magnetically attracted to the protrusion 41, and the valve body 6 floats slightly in the axial direction. Further, the valve body 6 rotates from the valve closed position B to the valve opened position A, the through hole 8 provided in the valve body 6 overlaps the inflow port P _1, and the fluid flows into the valve chamber S from the inflow port P ₁ and the discharge port P ₂ Emitted from. When the valve is opened, the valve body 6 slightly floats in the axial direction due to the magnetic attraction force, so that the sliding resistance is reduced and the valve body 6 can smoothly rotate.
Further, no special bearings or the like for holding the valve body 6 in a floating state in the axial direction are required, which facilitates manufacturing.

Since the flow path is opened and closed by rotating the valve body 6 in this manner, the valve body 6 does not collide with the center post 4 and abnormal noise is not generated. Therefore, even if the flow rate is controlled by opening and closing the flow path intermittently with a periodic electrical signal,
The valve can be operated quietly. Further, in the present embodiment, the valve body 6 is floated and rotated very slightly, so that the control response is fast and the flow rate control and the like can be accurately performed.

Although the through hole 8 is provided in the valve body 6 in this embodiment, a notch or the like may be provided. Although the valve body 6 is formed in a circular shape, it is not limited to a circular shape, and various shapes such as an elliptical shape, a half-moon shape, a quadrangular shape, a triangular shape, and a polygonal shape can be applied. In the case of a shape other than the circular shape, a rotary shaft may be provided and the rotary shaft may be rotated. The through hole 8 provided in the valve body 6 is not always necessary, and in short, as long as the valve body 6 can be rotated to open and close the flow path, for example, a triangular valve body can be rotated to flow at the corners. Block the road,
It is also possible to adopt a configuration in which the flow path is opened at the side portion.

(Effect of the Invention) The present invention has the above-described configuration and operation. Since the magnetic body portion embedded in the valve body is magnetically attracted by the solenoid to rotate the valve body to open and close the flow path, As described above, the striking sound is not generated by the reciprocating motion of the valve body between the center post and the valve seat, and it is possible to obtain the effect of preventing noise during valve operation. When the valve is opened, the urging force of the urging means that presses the valve body toward the valve seat side is balanced with the axial magnetic attraction force of the solenoid to hold the valve body in a floating state between the center post and the valve seat. Therefore, special parts such as bearings for holding the valve element in a floating state in the axial direction are not required, and the manufacturing is facilitated.

[Brief description of drawings]

1 is a schematic vertical sectional view of a solenoid valve according to an embodiment of the present invention, FIG. 2 is an enlarged perspective view of a valve body of the solenoid valve of FIG. 1, and FIG.
FIGS. 4 and 5 show the operating state of the solenoid valve of FIG. 1, and FIGS. 3 (a) and 3 (b) are an enlarged perspective view and a vertical cross-sectional view of the vicinity of the valve body when not energized, and FIG. (A) and (b)
Is an enlarged perspective view and a longitudinal sectional view of the vicinity of the valve body when energized.
The figure is a longitudinal sectional view of a conventional solenoid valve. DESCRIPTION OF SYMBOLS 1 ... Solenoid, 4 ... Center post 5 ... Valve seat (valve seat) 6 ... Valve body, 61 ... Magnetic body 7 ... Recessed portion, 8 ... Through hole 9 ... Tapered spring (biasing means), A ... Valve opening position B ... closed position, P ₁ ... inlet P ₂ ... discharge port, S ... valve chamber

Claims (1)

[Scope of utility model registration request] 1. A solenoid valve having a center post and a solenoid surrounding the center post, wherein the solenoid is energized / de-energized to move the valve body to open / close a flow path. It is made of a non-magnetic material with a magnetic material embedded in it, and is provided between the center post and the valve seat so as to be movable in the rotational direction and the axial direction. The solenoid is excited to magnetically attract the magnetic material part to the center post. By this, the valve body is rotated to control the opening and closing of the flow path, and the suction portion of the center post and the magnetic body are provided with a phase shift in the rotation direction so that the valve body is rotated in the valve closing direction. An urging means for urging and urging in the direction of pressing against the valve seat is provided, and when the valve is opened, the urging force in the pressing direction of the urging means and the axial magnetic attraction force by the solenoid are balanced. , The valve body An electromagnetic valve characterized by being held in a floating state between an input post and a valve seat.