JPH0633266Y2 - solenoid valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a solenoid valve.

[Prior Art] As a method for inexpensively manufacturing a solenoid valve, a ball valve is fixed to the tip of a movable iron core, and the movable iron core and the ball valve are integrally assembled inside a housing to simplify the manufacturing process. There is something.

As the above-mentioned solenoid valve, for example, the actual opening of Sho 57-165866
Some are disclosed in the issue. As shown in FIG. 7, this solenoid valve constantly urges the movable iron core 41 in the housing 40 by the push spring 42 to bring the ball valve 43 fixed to one end surface of the movable iron core 41 into contact with the valve seat 49. By doing so, the port A is closed and the port B and the port C are communicated with each other through the flow passage 44 formed in the outer peripheral surface of the movable iron core 41. Then, by exciting the solenoid 45, the movable iron core 41 is moved toward the suction element 46 side against the force of the pushing spring 42, and the ball valve 48 of the movable iron core 41 is moved.
Thus, the port B is closed, the communication between the port B and the port C is cut off, and the port A and the port B are connected to switch the direction of the fluid.

[Problems to be Solved by the Invention] However, in the above configuration, the ball valves 43 facing each other are provided.
If one of the valve seat 49 and the valve seat 49 is vertically displaced from the set position due to a manufacturing error that is apt to occur in metal working, the ball valve 43 and the valve seat 49 are eccentric. Then, the communication between port B and port C is cut off, and port A
When switching the communication between the port C and the port C, the ball valve 43 does not come into contact with the valve seat 49 in a precisely aligned state, the port B is not completely closed, and fluid may leak.

In order to avoid the above-mentioned inconvenience, it is necessary that the centers of the ball valve 43 and the valve seat 49 and the centers of the solenoid 45 and the movable iron core 41 be exactly aligned with each other to generate a uniform magnetic field during excitation. Accurate alignment of the valve 43 and the valve seat 49 is required. Therefore, this solenoid valve requires extremely high processing accuracy and is complicated to manufacture.

The present invention has been made in order to solve the above-mentioned problems, and an object thereof is to provide a solenoid valve that is easy to manufacture without requiring high processing accuracy in manufacturing.

[Means for Solving the Problem] In order to solve the above-mentioned object, the present invention provides an end face of a movable iron core that moves in a valve chamber by excitation / demagnetization of a solenoid,
A solenoid valve in which a spherical seat portion for selectively opening and closing a valve seat according to the movement of the movable iron core, and communicating and blocking at least two ports in correspondence with the opening / closing operation is fixed, The movable core is formed to have a smaller diameter toward both ends in the length direction, and the outer peripheral surface near the center in the length direction is a surface that contacts the valve chamber, and the movable core contacts the valve chamber. The main point is that the valve seat can be swung in this state.

[Operation] When the movable core moves due to the demagnetization of the solenoid, the sealing surface of the seat portion is brought into contact with the valve seat. When there is eccentricity between the seat part and the valve seat, the movable iron core, which receives the force of the seat part trying to move along the valve seat, contacts the valve chamber and swings against the valve seat to move inside the valve chamber. The posture is changed and the seat and the valve seat are aligned.

[Embodiment] A first embodiment of the present invention will be described in detail below with reference to FIGS.

A pair of left and right fixing members 2 and 3 are tightly fitted in the housing 1 having a rectangular cross section, and the small-diameter boss portions 4 and 5 of these fixing members 2 and 3 are formed in the through holes 6 formed on both end surfaces of the housing 1.
7 protrudes to the outside. The housing 1
A cylindrical holding member 8 is arranged inside the fixing members 2 and 3, and a solenoid 10 is arranged in an annular space 9 inside the holding member 8.

The right and left fixing member 2 is provided with a columnar portion 11 protruding into the holding member 8, and a recess 12 is formed on the right end surface thereof. Then, the port B is provided outside the left fixing member 2.
A fluid passage 14 that communicates with the recess 12 and extends through the entire fixing member 2. A restriction is applied to the fluid passage 14 in the vicinity of the recess 12, and a curved contact surface 15 is formed on the peripheral edge of the opening in the recess 12. The contact surface 15 functions as a valve seat for contacting and separating a spherical body 25, which will be described later, and the contacting and separating of the spherical body 25 selectively opens and closes.

Further, the right side fixing member 3 includes the columnar portion 1 of the left side fixing member 2.
A pair of communication grooves 18 and 19 facing each other with an interval equal to the outer diameter of 1 is formed, and these communication grooves 18 and 19 extend to the outside of the solenoid valve and communicate with the port C. Also,
A recess 20 is formed on the inner end surface of the right fixing member 3, and a fluid passage 21 extending from the port A through the entire right fixing member 3 communicates with the recess 20. The fluid passage 21
A stop is applied near the recess 20, and a curved contact surface 22 is formed on the peripheral edge of the opening in the recess 20. Note that, like the contact surface 15, this contact surface 22 also functions as a valve seat with which the spherical body 26 contacts and separates.

In the holding member 8, a movable iron core 23 is arranged in a valve chamber 37 formed between the left and right fixed members 2 and 3, and the outer peripheral surface of the movable iron core 23 has a radiused shape with a larger diameter toward the center in the length direction. A heart-promoting surface 24 is formed. Then, as shown in FIG. 3, passage grooves 29, 30 extending in the entire length direction are formed on the centering promoting surface 24 at positions facing each other in the radial direction.
Is engraved. Further, protrusions 31 and 32 are formed on the left and right end surfaces of the movable iron core 23, respectively.
Spherical bodies 25 and 26 as seat portions are fixedly mounted on the end faces of 32, respectively, and the contact surfaces 1 of these spherical bodies 25 and 26 are fixed.
The surfaces facing 5, 22 are seat surfaces 27, 28, respectively.

The left end surface of the movable iron core 23 and the columnar portion 1 of the left side fixing member 2
1, the gaps 33, 34 between the right end surface of the movable iron core 23 and the left end surface of the right fixing member 3 are the centering promoting surface 24.
Through the passage grooves 29, 30 of the. Further, a push spring 36 is stretched between the spring receiving portion 35 having a step shape at the inner end portion of the columnar portion 11 of the left fixing member 2 and the left end surface of the movable iron core 23. And the solenoid 10
As shown in FIG. 1, the movable iron core 32 is urged to the right by the pressing spring 36 when the power is de-energized, that is, the seat surface 28 of the spherical body 26 contacts the contact surface 22 of the right fixing member 3.
The fluid passage 21 is closed by being engaged with. Therefore, the fluid that has flowed into the gap 33 from the port B through the fluid passage 14 of the left fixing member 2 moves into the movable iron core 23.
Through the passage grooves 29, 30 and the gap 34,
It flows through 19 and flows out to port C.

When the solenoid 10 is energized, that is, when it is excited, the movable iron core 23 is held to the left and the spherical body 25 engages with the contact surface 15 of the left fixing member 2, as shown in FIG. By being combined, the fluid passage 14 is closed. Therefore, the fluid that has flowed into the gap 34 from the port A through the fluid passage 21 of the right side fixing member 3 has the communication grooves 18, 1.
It flows in 9 and flows out to port C.

Now, the operation of the solenoid valve configured as described above will be described below.

Now, when the solenoid 10 is demagnetized from the state shown in FIG. 2 to switch the solenoid valve that communicates the ports A and C as shown in FIG. 1, the movable iron core 23
Is moved by the urging force of the push spring 36, and the seat surface 28 of the spherical body 26 engages with the contact surface 22 of the right side fixing member 3. When the centers of the spherical body 26 and the contact surface 22 do not coincide with each other, for example, as shown in FIG.
When any one of the positions 26 is displaced (the position of the contact surface 22 is low in the drawing), the urging force of the push spring 36 is received and the contact surface 22 is attempted to move in the centering direction. The force of the spherical body 26 causes the movable iron core 23 to move the centering promoting surface 2
Based on the shape of No. 4, the housing 1 is slightly rotated to change its posture as shown by a chain double-dashed line, the eccentricity of both 22 and 26 is eliminated, and the port A is reliably closed. This allows
The solenoid valve can be surely switched to a state in which the port B and the port C communicate with each other.

The left fixing member 2 when the solenoid 10 is excited
Even when there is eccentricity between the contact surface 15 and the spherical body 25 of the right side fixing member 3, alignment is performed by the same method as described above.

In the solenoid valve described above, even if the spherical bodies 25, 26 fixed to one end of the movable iron core 23 and the contact surfaces 15, 22 are slightly eccentric, the solenoid valve is automatically aligned. Align these centers when manufacturing the solenoid 10
Since it is not necessary to align the centers of the movable iron core 23 and the movable iron core 23, manufacturing becomes very simple.

Next, a second embodiment of the present invention will be described with reference to FIGS.

In this embodiment, the structure of the solenoid valve is a two-way valve instead of the three-way valve in the first embodiment. That is, in FIG. 5, the fixed iron core 38 is arranged in the housing 1 instead of the left fixed member, the port B is omitted, and the communication between the port A and the port C is cut off. In this configuration, since the port B is omitted, it is not necessary to form the passage grooves 29 and 30 on the peripheral surface of the movable iron core 23, and the manufacturing is further simplified.

Further, in FIG. 6, only the fluid passage 21 is directly formed in the right fixing member 3 so that the port A and the port B are communicated with each other.

In these two-way valves as well, the movable iron core 23 is formed in the same manner as in the first embodiment, and the spherical body 25 (26) and the contact surface 15 (2
The alignment with (2) is performed by the alignment promoting surface 24.

[Effect] As described in detail above, according to the present invention, the excellent effect that the manufacturing is simple without exhibiting high processing accuracy in manufacturing is exhibited.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is a sectional view showing changes in FIG. 1, FIG. 3 is a side view showing a movable iron core, and FIG. 4 is a spherical valve. FIG. 5 and FIG. 6 are sectional views showing a second embodiment of the present invention, respectively, and FIG. 7 is a sectional view showing a conventional example. It is a figure. Solenoid 10, contact surfaces 15 and 22 as valve seats, movable iron core 23, spherical bodies 25 and 26 as seat portions, centering promoting surface 24, valve chamber 37, ports A, B and C.

Claims (1)

[Scope of utility model registration request] 1. A spherical surface for selectively opening and closing a valve seat according to the movement of the movable iron core on the end surface of the movable iron core that moves in the valve chamber by the demagnetization of a solenoid so as to connect and disconnect at least two ports. A solenoid valve having a seat portion fixed thereto, wherein the movable iron core is formed to have a smaller diameter toward both end portions in the length direction, and the outer peripheral surface near the center in the length direction is a surface contacting the valve chamber. A solenoid valve which is formed on the movable core and is capable of swinging with respect to the valve seat in a state where the movable core is in contact with the valve chamber.