JPH0319657Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a technology that is effective when applied to a solenoid valve used for switching the flow of a fluid such as air, such as a poppet type or a spool type. This invention relates to technology that is effective for use in solenoid valves.

[Conventional technology]

In poppet-type and spool-type solenoid valves, the magnetic attraction force that magnetically attracts the movable core changes depending on the distance between the movable core and the fixed core when the solenoid is demagnetized, that is, the stroke of the movable core. . Therefore, it is necessary to set the stroke of the movable core to a predetermined distance in order to ensure stability and reliability of the operation of the solenoid valve.

However, the stroke of this movable iron core is usually
Due to dimensional errors in each component such as the movable core and the fixed core, the distance is often not set at a predetermined distance.

Therefore, as a solenoid valve that solves this drawback, a fixed iron core is screwed onto the upper iron core of the solenoid part and rotatably connected, and the rotation of this fixed iron core moves the fixed iron core and connects the movable iron core and the fixed iron core. Some have a structure that allows the distance between them to be adjusted.

[Problem that the invention attempts to solve]

However, in the solenoid valve having the above-described structure, the fixed iron core and the upper iron core of the solenoid part are connected by screwing together, so the close contact area between the two is small, and as a result, the magnetic efficiency is reduced. There is a problem with that.

The present invention was developed with attention to the above-mentioned problems, and its purpose is to be able to adjust the distance between the movable core and the fixed core without reducing magnetic efficiency, and to improve the stability of operation. An object of the present invention is to provide a solenoid valve that can improve reliability.

[Means for solving problems]

In the present invention, the length of a movable member such as a movable iron core along the direction of movement is adjustable.

[Effect]

According to the above-mentioned means, by adjusting the length of the movable member, the distance between the movable member and the fixed core can be adjusted, so that the operation of the solenoid valve can be stabilized without reducing the magnetic efficiency. This makes it possible to improve performance and reliability.

[Embodiment 1] FIG. 1 is a sectional view of a solenoid valve showing an embodiment of the present invention.

In this embodiment, the present invention is applied to a poppet-type solenoid valve, which is an example of a solenoid valve.

The solenoid part 1 of this solenoid valve has a solenoid 2
A bobbin 2 into which a is inserted, an iron core 3 provided around the outer periphery of this bobbin 2, and a fixed iron core 4 which is inserted halfway into the bobbin hole 2b of the bobbin 2.
and the flange 4a of the fixed core 4 is placed in the recess at the top of the core 3.
a cover 5 that tightly fixes the
It has a movable member 8 which is a movable iron core that opens and closes.

The movable member 8 is arranged such that the movable member 8, which is a movable iron core, is moved in the axial direction, that is, in the vertical direction in FIG. It is mounted so that it can reciprocate in the direction.

The movable member 8 includes a movable core body 8a, a lock nut 8c screwed into the middle of the male threaded portion 8b of the movable core body 8a, and a distance adjustment nut 8c screwed onto the tip side of the male screwed portion 8b. It consists of a member 8d.
The movable core body 8a is located approximately in the lower half of the bobbin hole 2b of the solenoid part 1, but the male threaded part 8b, the lock nut 8c, and the distance adjustment member 8d are connected to the recessed part of the valve part 7. It is now located at 7a. Further, a valve body 8e is embedded in the lower surface of the distance adjusting member 8d by baking or adhesion.

The movable member 8 having such a structure has a male threaded portion 8b.
By rotating and moving the distance adjusting member 8d screwed into the member 8 and fixing the movement with the lock nut 8c, the length along the moving direction of the movable member 8, that is, the vertical direction in FIG. The length can be adjusted.

Through this adjustment, the solenoid valve of this embodiment has a structure in which the stroke of the movable member 8 can be arbitrarily adjusted.

The movable member 8 is biased downward in FIG. 1 by the first spring 9 in the recess 7a, so that when the solenoid section 1 is demagnetized, the valve body 8e is pressed against the bottom of the recess 7a. 1st valve hole 1
It is designed to close 0.

On the other hand, a cavity 7b is formed in the lower part of the valve part 7 and is sealed by a lid 11. A second valve body 12 is installed in this cavity 7b. The second valve body 12 is biased upward in FIG. 1 by a second spring 13 in the cavity 7b, and closes the second valve hole 14 when the solenoid part 1 is energized.

For example, two rod through holes 15a are formed approximately in the center of the valve portion 7 along its axial direction, and the upper recess 7a and the lower hollow portion 7b communicate with each other through the rod through holes 15a. has been done.
Rods 15 are loosely inserted into the rod through holes 15a, and both ends of the rods 15 are in contact with the lower surface of the distance adjusting member 8d and the upper surface of the second valve body 12, respectively.

A first port 16, a second port 17, and a third port 18 are provided on the outer surface of the valve portion 7, respectively. The first port 16 communicates with the first valve hole 10, the second port 17 communicates with the second valve hole 14, and the third port 18 communicates with the cavity 7b.

Next, the operation of this embodiment will be explained.

The distance between the movable member 8 and the fixed core 4 may vary due to dimensional errors in each part of the solenoid section 1 and valve section 7.
That is, when the stroke of the movable member 8 differs from a predetermined stroke, or when it is desired to change the stroke of the movable member 8 due to the necessity of adjusting the flow rate, first loosen the screws (not shown) and disconnect the solenoid part 1 and the valve part 7. are separated from each other, and the movable member 8, which was mounted in the space formed by the recess 7a and the lower half of the bobbin hole 2b, is released from its mounted state.
After the distance adjusting member 8d screwed into the male threaded portion 8b is rotated and moved by a predetermined distance, the lock nut 8c is rotated to fix the position of the distance adjusting member 8d.

By such an operation, the length of the movable member 8 along the movement direction, that is, the length in the vertical direction in FIG. 1, can be adjusted, and the stroke of the movable member 8 can be arbitrarily adjusted to a predetermined stroke.

Next, the operating state of the solenoid valve of this embodiment will be explained.

FIG. 1 shows a state in which the solenoid part 1 is demagnetized, and the movable member 8 is urged downward in FIG. The first valve hole 10 is closed by being pressed against the valve seat.

On the other hand, the second valve body 12 is pressed against the urging force of the second spring 13 by the rod 15, which is pressed down by the urging force of the first spring 9.
The second valve hole 14 is opened by being separated from the valve seat of the valve hole 14 .

In this state, the first port 16 is closed, and the second port 17 and third port 18 are communicated via the second valve hole 14.

On the other hand, when the solenoid part 1 is energized, the movable member 8 resists the biasing force of the first spring 9 due to the energizing action of the solenoid part 1, and moves the movable member 8 toward the first valve hole 1.
0 and comes into contact with the fixed iron core 4 to open the first valve hole 10.

Further, when the movable member 8 is separated from the valve seat of the first valve hole 10, the second valve body 12 is released from the pressure of the rod 15, and the second valve hole 14 is moved by the urging force of the second spring 13. The second valve is pressed against the valve seat of
The valve hole 14 is closed.

In this state, the second port 17 is closed, and the first port 16 and third port 18 are communicated with each other via the first valve hole 10 and the rod through hole 15a.

[Embodiment 2] FIG. 2 is a sectional view of a solenoid valve showing another embodiment of the present invention.

Since the solenoid valve of the second embodiment is of a spool type, its movable member 8 has a structure different from that of the solenoid valve of the first embodiment.
Although the valve body 8e is not provided, the main shaft 20 is mounted in the shaft hole 21 so as to be movable along its axial direction,
One end (the right end in the figure) of this main shaft 20 is joined to the movable member 8.

In addition, the movable member 8 of this solenoid valve includes Example 1
The lock nut 8c of the solenoid valve is also not provided, but instead, a set screw 8f is installed on the distance adjustment member 8.
It is screwed into the screw hole d. This set screw 8f
The distance adjusting member 8d is rotated and moved by a predetermined distance, and then rotated to fix the position of the distance adjusting member 8d.

Although the present invention has been specifically explained based on the embodiments above, the present invention is not limited to the above embodiments, and can be modified in various ways without departing from the gist thereof.

For example, the movable member 8 in the first and second embodiments is fitted into the bobbin hole 2b, but the invention is not limited to this. For example, the tip of the fixed iron core 4 extends to the open end of the bobbin hole 2b. Due to this, the movable member 8 may be located only in the recess 7a of the valve portion 7 without being inserted into the bobbin hole 2b.

[Effect of idea]

According to the present invention, the electromagnetic valve is provided with a movable member that opens and closes a valve hole by moving due to the magnetic attraction action of a solenoid part, wherein the movable member is connected to a movable core body and the movable core. By having a structure including a distance adjusting member that is screwed and rotatably connected to one end surface of the main body and adjusts the length along the movement direction of the movable member, the following effects can be obtained. can.

(1) By adjusting the length of the movable member, the distance between the movable member and the fixed core can be adjusted, so the stroke of the movable member can be arbitrarily adjusted without reducing magnetic efficiency. I can do it.

(2) Due to the effect of (1), it is possible to improve the stability and reliability of the operation of the solenoid valve.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a solenoid valve showing one embodiment of the present invention, and FIG. 2 is a sectional view of a solenoid valve showing another embodiment of the present invention. 1...Solenoid part, 2...Bobbin, 2a...
Solenoid, 2b... Bobbin hole, 3... Iron core, 4
...Fixed iron core, 4a...Flame, 5...Cover, 6
... Seal member, 7 ... Valve part, 7a ... Recessed part, 7
b...Cavity part, 8...Movable member, 8a...Movable core body, 8b...Male threaded part, 8c...Lock nut, 8d...Distance adjustment member, 8e...Valve body, 8f
... Set screw, 9 ... First spring, 10 ...
First valve hole, 11... Lid, 12... Second valve body, 13
...Second spring, 14...Second valve hole, 15...
...Rod, 15a... Through hole for rod, 16...
1st port, 17...2nd port, 18...3rd port
Port, 20...Main shaft, 21...Shaft hole.

Claims (1)

[Scope of utility model registration request] The electromagnetic valve is equipped with a movable member that opens and closes a valve hole by moving due to the magnetic attraction action of a solenoid part, and the movable member is screwed into a movable core body and one end surface of the movable core body. A solenoid valve comprising: a distance adjusting member which is rotatably connected to adjust the length of the movable member in the direction of movement thereof;