JPH083793Y2 - solenoid valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a solenoid valve used for controlling a compressor or the like.

[Prior art]

Conventionally, as shown in FIGS. 5 to 8, an electromagnetic valve has an inlet nozzle 1 and an outlet nozzle 3 (FIG. 7) and a cylindrical plunger 2 (FIG. 5) provided between them, and the plunger 2 described above. The guide pipe 4 is provided on the outer periphery of the guide pipe 4, and the solenoid 5 for operating the plunger is provided on the outer periphery of the guide pipe 4. The solenoid valve opens and closes the flow state between the inlet nozzle 1 and the outlet nozzle 3 by moving the plunger 2 by the solenoid 5.

The inlet nozzle 1 is, as shown in FIG.
Having 10. The inlet channel 10 has a port A and communicates with the first gas channel chamber 11.

Further, as shown in FIG. 5, the plunger 2 has a front end main body portion having a ball 20 as an opening / closing valve head fixed on the inlet side.
21 and a spring locking portion 22 that protrudes at approximately the center
And a grooved head 29 having a cut groove 290 as a flow path
And consists of. Further, the grooved head portion 29 has a ball 24 as an opening / closing valve head fixed to a tip end portion on the outlet nozzle side.

Further, as shown in FIG. 7, the outlet nozzle 3 has a cylindrical fitting portion 31 into which the grooved head portion 29 is fitted and inserted on the inlet side.
And a locking flange portion 33 protruding outward and a rear end nozzle portion 34.

Further, the rear end nozzle portion 34 has the outlet flow passage 34 at the central portion.
It has 0 and a bypass flow passage 35 arranged side by side along the outlet flow passage 340. Then, as shown in FIG. 8, the outlet channel 340 has a port B at its tip. Also,
The bypass passage 35 has a port C at its tip.

Further, a guide pipe 4 is arranged on the outer periphery of the plunger 2 as shown in FIG. Further, between the guide pipe 4 and the plunger 2, the plunger 2
Is provided with a spring 41 that biases the outlet nozzle 340 in a direction to close the outlet passage 340 of the outlet nozzle 3.

A solenoid 5 for activating the plunger is arranged on the outer circumference of the guide pipe 4. The solenoid 5 is electrically connected to the connector 6.

Since the solenoid valve is configured as described above, it is operated as follows by exciting or demagnetizing the solenoid.

That is, first, when the solenoid is demagnetized (OFF), the plunger 2 is biased by the spring 41 in the direction of arrow X. Therefore, the inlet flow path 10 of the inlet nozzle 1
The tip portion 110 of the is open and is in a circulation state.

Therefore, the fluid proceeds from the tip end portion 110 of the inlet passage 10 to the guide passage 42 in which the spring 41 is arranged. In addition, the fluid passes through the inside of the cut groove 290 to the second groove.
It advances to the gas passage chamber 341, passes through the bypass flow path 35, and reaches the port C.

Therefore, the fluid will flow from port A to port C.

On the other hand, when the solenoid is excited (ON), the plunger 2 is magnetically attracted in the arrow Y direction. Therefore, the ball 20 blocks the tip portion 110 of the inlet channel 10. Therefore, the fluid does not enter the first gas passage chamber 11 through the port A.

At this time, the balls 24 of the plunger 2 are
Open 340. Therefore, the fluid enters from the port C and flows to the port B through the bypass flow passage 35, the second gas passage chamber 341, and the outlet flow passage 340. That is, the distribution state from the port C to the port B is formed.

[Problems to be solved]

However, the above conventional technique has the following problems.

That is, as shown in FIG. 5, the plunger 2 has a relatively small shape with the grooved head portion 29 having a diameter of, for example, 5 to 6 mm. Therefore, it is difficult to machine the cut groove 290 in the grooved head portion 29 in the axial direction. Particularly, the cut groove 290 is formed in the root portion 2 of the spring engaging portion 22.
It is difficult to form up to 21 in a continuous state, and the processing cost is high.

Further, the solenoid valve operates the plunger by the electromagnetic force as described above. In order to drive the plunger more accurately, it is necessary to secure a large magnetic flux passage so that more magnetic flux flows from the outlet nozzle to the plunger and increase the driving force of the plunger.

The present invention has been made in view of the problems of the prior art, and an object of the present invention is to provide a solenoid valve in which the flow passage can be easily processed, the driving force of the plunger is large, and which is relatively inexpensive.

[Means for solving problems]

The present invention has an inlet nozzle, an outlet nozzle, a cylindrical plunger provided between them, a guide pipe provided on the outer circumference of the plunger, and a solenoid for operating the plunger provided on the outer circumference of the guide pipe. Then, in the solenoid valve that opens and closes the flow state between the inlet nozzle and the outlet nozzle by moving the plunger by the solenoid, the plunger is a cylindrical head that is inserted into the cylindrical hole of the cylindrical fitting portion of the outlet nozzle. The cylindrical fitting portion has a side surface notch extending in the axial direction in a part of the side surface thereof, and the side surface notch is provided with a vent hole penetrating to the cylindrical hole. The electromagnetic valve is characterized in that a flow path is formed between the inlet nozzle and the outlet nozzle through the side notch and the vent hole.

What is most noticeable in the present invention is that the plunger has a cylindrical head that is inserted into the cylindrical hole of the cylindrical fitting portion of the outlet nozzle, and that the cylindrical fitting portion is provided with the side notch and the ventilation hole. A hole is bored, and a flow path is formed between the inlet nozzle and the outlet nozzle through the side surface notch and the vent hole.

The cylindrical fitting portion is made of, for example, a metallic cylindrical member, and the inner diameter of the cylindrical hole of the cylindrical fitting portion is substantially equal to the diameter of the cylindrical head portion described later. A cylinder head is inserted into the cylinder hole of the cylinder fitting portion, and the cylinder head slides in the cylinder hole of the cylinder fitting portion when the solenoid is excited or demagnetized.

The plunger is a cylindrical body having a circular cross section. Further, the outer periphery thereof does not have a cut groove unlike the conventional one.

[Action]

In the solenoid valve of the present invention, the flow passage between the inlet nozzle and the outlet nozzle is formed by the side cutout portion and the vent hole provided in the cylindrical fitting portion of the outlet nozzle.

That is, conventionally, the above-mentioned flow path formation has been performed by the cut groove in the grooved head portion of the plunger. On the other hand, in the present invention, the head portion of the plunger is a columnar body having a circular cross section without a groove, and the side surface notch portion is formed on the side surface of the cylindrical fitting portion into which the columnar body is inserted. ,
Further, a ventilation hole is provided between the side cutout portion and the cylindrical hole (FIGS. 1 and 4).

Therefore, in the past, the head of a plunger with a small diameter had to be cut, but in the present invention, a side cutout and a vent hole should be formed in a cylindrical fitting portion larger than the diameter of the plunger head. It will be good.

Therefore, the cylindrical fitting portion can be easily processed, and the solenoid valve can be processed relatively inexpensively.

Further, it is particularly important that, in the solenoid valve according to the present invention, the plunger and the cylindrical fitting portion form a fluid passage as well as a magnetic flux passage generated by a solenoid. . The magnitude of this magnetic flux passage affects the magnitude of the driving force of the plunger.

When forming the fluid passage, the tip portion of the cylindrical fitting portion forming the cylindrical hole is moved along the axial direction U
It may be possible to form two notch openings by cutting out in a letter shape. However, in this case, the cutout opening portion does not serve as a magnetic flux passage, so that the magnetic flux passage from the cylindrical fitting portion to the plunger is reduced. Therefore, the driving force of the plunger is reduced.

On the other hand, in the present invention, the U-shaped cutout opening is not provided. Therefore, a large magnetic flux path can be secured, and the driving force of the plunger is large.

〔effect〕

Therefore, according to the present invention, the processing of the flow path is easy,
It is possible to provide a relatively inexpensive solenoid valve having a large plunger driving force.

〔Example〕

First Embodiment A solenoid valve according to this embodiment will be described with reference to FIGS. 1 to 4.

That is, as shown in FIG. 4, the solenoid valve of this example includes an inlet nozzle 1, an outlet nozzle 3, a cylindrical plunger 2 provided between them, and a guide pipe 4 provided on the outer periphery of the plunger 2. , And a solenoid 5 for operating the plunger provided on the outer circumference of the guide pipe 4. Then, by moving the plunger 2 by exciting or demagnetizing the solenoid 5, the flow state between the inlet nozzle 1 and the outlet nozzle 3 is opened and closed.

As shown in FIGS. 1 and 2, the outlet nozzle 3 has a side surface notch 36 formed by cutting off a part of the side surface of the cylindrical fitting portion 31 in the axial direction. Further, the side surface notch 36 is provided with a ventilation hole 360 penetrating to the cylindrical hole 311.

A flow path is formed between the inlet nozzle 1 and the outlet nozzle 3 through the side surface notch 36 and the vent hole 360.

That is, as shown in FIGS. 1 and 2, the cylindrical fitting portion 31 is made of a cylindrical metal cylinder and has one side surface cutout 36 on its side surface. The cylindrical fitting portion 31 has a cylindrical hole 311 into which a cylinder head 23 described later is inserted, and the cylindrical hole 311
The inner diameter of is approximately equal to the diameter of the cylinder head 23.

Further, the cylindrical fitting portion 31 has an outlet flow passage 340 and a bypass flow passage 35 which communicate with the inside of the cylindrical hole 311.

The plunger 2 is, as shown in FIGS. 3 and 4,
It is composed of a cylindrical head portion 23 having a circular cross section mounted with a ball 24, a spring locking portion 22, and a front end main body portion 21 mounted with the ball 20. The column head 23 does not have a conventional cut groove on its outer circumference.

Further, as shown in FIG. 2, when the plunger 2 is fitted into the cylindrical fitting portion 31, the side surface notch 36 of the outlet nozzle 3 and the vent hole 360 are located between the inlet nozzle 1 and the outlet nozzle 3. Form a flow path. The other structure is the same as that of the conventional solenoid valve (FIG. 8).

 Next, the function and effect will be described.

That is, in the solenoid valve of this embodiment, when the solenoid 5 is demagnetized (OFF), the plunger 2 is biased in the X direction by the spring 41 as shown in FIG. Therefore, the fluid flows from port A to port C. At this time, a flow path is formed between the inlet nozzle 1 and the outlet nozzle 3 through the side surface notch 36 and the vent hole 360 provided in the cylindrical fitting portion 31 of the outlet nozzle.

On the other hand, when the solenoid 5 is excited (ON), the plunger 2 is magnetically attracted to the arrow Y. Therefore, the ball 20 blocks the tip 110 of the inlet channel 10. Therefore, the fluid does not enter the first gas passage chamber 11 from the port A.

Also, at this time, the ball 24 of the plunger is connected to the outlet nozzle 3
The outlet flow path 340 of the is open. Therefore, the fluid enters from the port C, passes through the bypass flow passage 35, and then flows into the second gas passage chamber 34.
1 and then from the outlet flow path 340 to the port B. This state is similar to the conventional solenoid valve.

By the way, the side surface notch portion 36 is formed along the axial direction of the cylindrical fitting portion 31 having a relatively large shape. Therefore, the side surface notch 36 and the vent hole 360 are easy to process.

That is, the side surface notch portion 36 can be easily formed by cutting off the side surface of the cylindrical fitting portion 31 by milling as shown in FIGS. 1 and 2. On the other hand, the vent hole 360 can also be formed relatively easily by drilling.

Therefore, the flow path can be easily processed, and can be processed at a relatively low cost.

Further, the most important thing in this example is that the side surface notch 36 is formed by cutting a part of the side surface of the cylindrical fitting portion 31. Therefore, as described above, the cylindrical fitting part
The cross-sectional area of the magnetic path (magnetic flux path) can be made wider than in the case where the tip end portion of 31 is cut into a U shape to form two notch openings.

Therefore, the magnetic flux generated by the solenoid can be effectively sent to the plunger 2, and the driving force of the plunger can be increased.

That is, in the case where the side surface notch 36 is provided, the cylindrical hole and the plunger are more provided than the two magnetic flux passages in the cylindrical fitting portion divided by the “two U-shaped notch openings” described above. The contact area with the cylinder head of is large. Therefore, the magnetic path cross-sectional area can be increased. Therefore, the driving force of the plunger is also large.

Therefore, according to this example, it is possible to inexpensively obtain a solenoid valve in which the flow passage is more easily processed, the magnetic flux passage is large, and thus the driving force of the plunger is large.

[Brief description of drawings]

1 to 4 show a solenoid valve according to an embodiment, FIG. 1 is a perspective view of an outlet nozzle, and FIG. 2 is a state in which a side cutout is formed by inserting a plunger into the outlet nozzle. K-
A sectional view taken along the line K, FIG. 3 is a perspective view of the plunger, FIG. 4 is a sectional view of the solenoid valve, FIGS. 5 to 8 show a conventional solenoid valve, FIG. 5 is a perspective view of the plunger, FIG. 6 is a sectional view taken along the line MM of FIG. 8 in which a plunger is fitted into the outlet nozzle to form a flow path, FIG. 7 is a perspective view of the outlet nozzle, and FIG. 8 is a sectional view of a solenoid valve. It is a figure. 1 …… Inlet nozzle, 2 …… Plunger, 23 …… Cylinder head, 3
...... Outlet nozzle, 31 …… Cylinder fitting part, 36 …… Side notch, 3
60 …… Ventilation hole,

Claims (1)

[Scope of utility model registration request] 1. An inlet nozzle, an outlet nozzle, a cylindrical plunger provided therebetween, a guide pipe provided on the outer circumference of the plunger, and a solenoid for operating the plunger provided on the outer circumference of the guide pipe. A solenoid valve having a solenoid valve that opens and closes a flow state between an inlet nozzle and an outlet nozzle by moving the plunger by the solenoid, wherein the plunger is a cylinder inserted into a cylindrical hole of a cylindrical fitting portion of the outlet nozzle. The cylindrical fitting portion has a side surface notch extending in the axial direction on a part of its side surface, and the side surface notch has a vent hole penetrating to the cylindrical hole. A solenoid valve having a flow path formed between the inlet nozzle and the outlet nozzle through the side notch and the vent hole.