JP2001050417A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the accurate adjustment of coil depth by a core, and secure the core extraction strength in relation to a bonnet. SOLUTION: This solenoid valve 1 is provided with a plunger 12 provided freely to be reciprocated in the center hole 11a of a solenoid coil 11, a valve element 16 to be integrally moved with the plunger 12, a first and a second cores 13, 14 arranged in both ends of the solenoid coil 11, a bonnet 15 for housing them, and a body B having a valve seat 5 to be opened and closed by the valve element 16. The first core 13 is fixed to an inside upper end of the bonnet 15, and a skirt part of the bonnet 15 is caulked to a peripheral groove 14a of the second core 14. With this structure, the second core 14 is fixed to the bonnet 15, and a distance from the first core 13 to the second core 14, namely, a coil depth H is adjusted to the predetermined value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small electromagnetic valve used for controlling the flow of a small amount of liquid such as a chemical solution.

[0002]

2. Description of the Related Art Heretofore, small electromagnetic valves for controlling the flow of a small amount of chemicals and the like have been used in medical equipment, physical and chemical equipment, and the like. As such a small solenoid valve, for example, there is a solenoid valve 100 as shown in FIG. This solenoid valve 100
Is composed of an actuator part A in which an electromagnetic coil 101 is incorporated, and a body B in which a flow path 111 is formed. In the body B, an input port 102 and an output port 103 communicating with the flow path 111 are respectively opened to the outside. I have.

In the actuator section A, a first core 10 is provided at both ends of a center hole 101a of the electromagnetic coil 101.
Fifth, the second core 106 is disposed. First
The core 105 covers the upper end surface of the electromagnetic coil 101 in the figure, and its protruding portion 105a is inserted into the center hole 101a. The second core 106 covers a lower end surface of the electromagnetic coil 101 in the drawing, and a guide hole 106a provided in a central portion thereof.
, A plunger 104 is provided so as to be able to reciprocate.

The plunger 104 is vertically slidably guided in a guide hole 106a, and is urged downward by a spring 107. Further, at the lower end of the plunger 104, a diaphragm 108 constituting a valve body is fixed via a projecting portion 108a provided at the center thereof, and moves up and down together with the plunger 104. The outer edge of the diaphragm 108 is formed by the body B and the second core 10.
6 and fixed between them.

Accordingly, when the electromagnetic coil 101 is demagnetized and the plunger 104 is urged downward by the spring 107, the diaphragm 108 comes into contact with the valve seat 109 provided on the body B, and the flow path 111 is closed. . Also,
When the electromagnetic coil 101 is excited and the plunger 104 moves upward against the spring 107, the diaphragm 108 is separated from the valve seat 109 and the flow path 111 is opened.

[0006] The electromagnetic coil 101, the first core 105, the second core 106, the plunger 104 and the like are housed in a bottomed cylindrical bonnet 110. The inner periphery of the skirt of the bonnet 110 is bonded to the outer periphery of the second core 106 with the adhesive 1.
12 and fixed. The actuator section A is screwed to the body B. Here, the distance between the lower end surface 105b of the first core 105 and the bottom surface 106b of the second core 106 is defined as a coil depth H. This coil depth H corresponds to the distance between the first core 105 and the second core 106, and the plunger 1
This determines the magnitude of the magnetic force acting on the plunger 104 and the distance over which the plunger 104 can move. Therefore, the coil depth H affects the movement of the diaphragm 108 as the valve body, and affects the opening degree and the responsiveness of the solenoid valve 100.

[0007]

However, in the conventional solenoid valve 100, since the method of fixing the second core 106 and the bonnet 110 is based on the adhesive 112, the second solenoid valve 100 is deteriorated by the adhesive 112. Of the core 106 may be reduced. In addition, the second core 106 moves immediately after bonding, or a slight displacement occurs in the second core 106 due to an external force during use.
There is a possibility that the adjustment accuracy of the coil depth H may be deteriorated.

[0008] On the other hand, for example, a method in which the open end of the bonnet 110 is rounded toward the bottom surface 106b of the second core 106 may be considered. But in this case,
Although the removal strength of the second core 106 increases, there is a possibility that adjustment of the coil depth H becomes difficult. This is because it is difficult to obtain an accurate caulking amount of the opening end of the bonnet 110.

Alternatively, a method is also conceivable in which a male screw and a female screw are provided on the inner periphery of the skirt portion of the bonnet 110 and the outer periphery of the second core 106, respectively, and they are tightened and fixed to each other. However, in this case, although the pull-out strength of the second core 106 is increased, there is a problem that the processing of the male screw and the female screw is troublesome and the manufacturing process is complicated. In particular, in order to obtain a precise coil depth H, high precision is required for thread processing.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to easily adjust the coil depth with a core with high accuracy and to relatively easily remove the core from the bonnet. An object of the present invention is to provide a solenoid valve which can ensure the above.

[0011]

According to one aspect of the present invention, there is provided an electromagnetic coil, a first core disposed at one end of a center hole of the electromagnetic coil, and an electromagnetic coil. A plunger reciprocated toward the end face of the first core at the other end of the center hole, and a guide hole arranged at the other end of the center hole of the electromagnetic coil and guiding movement of the plunger. A second core, a valve body provided on the plunger, a body including a valve seat opened and closed by the valve body, an electromagnetic coil, a bonnet for accommodating the first core and the plunger, and the bonnet includes an electromagnetic coil. , The first core and the plunger are accommodated, and the second core is fixed inside the opening of the bonnet, so that the coil depth between the first core and the second core is set to a predetermined value. To the solenoid valve There, the second to the opening inside the hood
Is fitted, and the bonnet is caulked in a circumferential groove formed on the outer periphery of the second core.

According to the configuration of the present invention, the plunger is guided by the guide hole of the second core and reciprocates toward the end face of the first core, so that the distance between the first core and the second core is increased. That is, the moving distance of the plunger is determined by the coil depth. Further, since the valve seat of the body is opened and closed by the valve element provided on the plunger, the moving distance of the plunger affects the opening degree and the responsiveness as the electromagnetic valve. Here, since the first core is housed in the hood, the first core can be accurately positioned on the bonnet. Therefore, the coil depth is determined by the positional relationship between the second core and the bonnet. According to the present invention, the second core is fitted inside the opening of the bonnet and the bonnet is merely caulked in the circumferential groove of the core, so that the second core is mechanically and accurately positioned with respect to the bonnet. In addition, the setting of the depth of the circumferential groove and the setting of the swaging strength facilitates the management of the swaging amount.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying a solenoid valve of the present invention will be described below in detail with reference to the drawings. FIG.
1 shows a cross-sectional view of a solenoid valve 1 according to the present embodiment.

The internal structure of the solenoid valve 1 is the same as that of the conventional one, and comprises an actuator part A in which an electromagnetic coil 11 is incorporated and a body B in which a flow path 4 is formed.
The body B is provided with an input port 2 and an output port 3 communicating with the flow path 4, and a valve seat 5 is provided in the flow path 4.

The actuator section A includes a plunger 12 provided so as to be able to reciprocate in a center hole 11a of the electromagnetic coil 11, and a first core 13 and a second core 14 arranged at both upper and lower ends of the electromagnetic coil 11. And a hood 15 covering them. The first core 13 is a disc portion 13a.
And a protruding portion 13b protruding downward from the center thereof. The disk portion 13a covers the upper end of the electromagnetic coil 11 in the drawing, and the protruding portion 13b is inserted and arranged in the center hole 11a. The second core 14 has a substantially annular shape having a center hole 14a,
The lower end of the electromagnetic coil 11 in the figure is covered. This center hole 14a
, The vertical movement of the plunger 12 is guided. The plunger 12 has a substantially cylindrical shape, a diaphragm 16 as a valve body of the present invention is fixed to a lower end thereof, and a compression spring 17 is interposed between the plunger 12 and the first core 13 above the plunger 12. The diaphragm 16 opens and closes the valve seat 5 by moving up and down together with the plunger 12.

Further, a peripheral groove 14b is provided on the outer peripheral surface of the second core 14, and a part of the bonnet 15 is caulked to the peripheral groove 14b. Also, the second core 14
A wave washer 18 is sandwiched between the magnetic coil 11 and the electromagnetic coil 11. Here, the lower end surface 13 of the first core 13
The distance between c and the bottom surface 14c of the second core 14 is defined as a coil depth H. The distance that the plunger 12 can move in the actuator section A is determined by the coil depth H.

Next, the operation of the solenoid valve 1 will be described. FIG. 1 shows the solenoid valve 1 in a closed state, and the electromagnetic coil 11 is demagnetized. The plunger 12 is pushed down by a compression spring 17 so that the diaphragm 16 closes the valve seat 5 and the flow path 4 is blocked.

Here, when the electromagnetic coil 11 is excited,
The plunger 12 is pulled up against the compression spring 17 by the magnetic force generated by the electromagnetic coil 11, the first core 13 and the second core 14, and thus the center of the diaphragm 16 is pulled up. Therefore, the valve seat 5 is opened, and the ports 2 and 3 communicate with each other through the flow path 4.

Next, an assembly process of the solenoid valve 1 will be described. Here, the description of the process of assembling the body B and the process of attaching the actuator portion A to the body B will be omitted, and only the process of assembling the actuator portion A will be described. FIGS. 2 to 6 are cross-sectional views of each process related to the assembly of the actuator section A.

First, in the first step shown in FIG. 2, the second core 14 is set on the work table 26. Here, the work base 26 is a jig made of tool steel, and has a disk-shaped base part 26a and a column-shaped protrusion part 26 provided at the center thereof.
b. The outer diameter of the protrusion 26b matches the inner diameter of the center hole 14a of the second core 14, and the length matches the coil depth H.

Next, in a second step shown in FIG. 3, a wave washer 18, a coil assembly 21 and a bonnet assembly 20 are sequentially stacked on a work table 26 on which the second core 14 is set. At this time, the lead wire (not shown) of the coil assembly 21 is connected to the notch 23 of the bonnet assembly 20.
Set to go outside from FIG. 4 shows a state in which these are superimposed. As shown in FIG. 4, the presence of the wave washer 18 allows the protrusion 13 of the first core 13 to be formed.
b and a predetermined gap 2 between the protrusion 26b of the work table 26
8 are formed.

Here, the bonnet assembly 20 and the coil assembly 21 used in the second step have been assembled in advance before the second step. The bonnet assembly 20
The first core 13 is fixed in the bonnet 15, and an adhesive 22 is applied to the upper surface of the first core 13, and the front end protruding portion 13 d of the first core 13 is inserted into a hole 15 a at the upper center of the bonnet 15. Insert and glue. Furthermore, after caulking the front end protruding portion 13d to the bonnet 15, the surface is painted. A part of the hem of the bonnet 15 includes a coil assembly 21.
Notches 23 for passing lead wires (not shown) are provided. The coil assembly 21 forms the coil 24 by winding a coil winding 24a around a coil bobbin 24b, and forms a mold 25 by covering the coil 24 with a PBT resin.

Next, in a third step shown in FIG. 5, the hood of the bonnet 15 is fitted to the outer periphery of the second core 14 by pressing the bonnet assembly 20 against the work table 26 by the holding jig 29. At the same time, the wave washer 18 is deformed to bring the door portion 13b of the first core 13 and the door portion 26b of the work table 26 into contact with each other. By doing so, the distance between the lower end surface 13c of the first core 13 and the bottom surface 14c of the second core 14 is made equal to the protrusion 26b of the work table 26, and the coil depth H is determined by this distance. To do it.

Thereafter, in a fourth step shown in FIG. 6, the outer periphery of the skirt of the bonnet 15 is compressed by the caulking ring 30 while the bonnet 15 is pressed from above by the pressing jig 29. Thereby, a part of the outer periphery of the skirt portion of the bonnet 15 is swaged against the circumferential groove 14b of the second core 14. This caulking strength corresponds to the bonnet 1 of the second core 14.
5 corresponds to a size such that the pulling force with respect to No. 5 is 1157 N (118 kgf) or more.

FIG. 7 is an enlarged view of the swaged portion. The caulking ring 30 is provided with a caulking projection 30 a at a position corresponding to the circumferential groove 14 b of the second core 14. This projection 3
By pressing Oa against the second core 14, a part of the skirt of the bonnet 15 is caulked so as to penetrate the peripheral groove 14b along the outer periphery of the second core 14. Thus, the actuator section A is assembled.

As described above, in the solenoid valve 1 of this embodiment, the plunger 12 guided by the guide hole 14a of the second core 14 reciprocates toward the lower end surface 13c of the first core 13. It is supposed to. Therefore, the first
The movement distance of the plunger 12 is determined by the distance between the core 13 and the second core 14, that is, the coil depth H. Further, since the valve seat 5 is opened and closed by the diaphragm 16 fixed to the lower end of the plunger 12, the moving distance of the plunger 12 affects the opening degree and the responsiveness of the solenoid valve 1. Here, since the first core 13 is accommodated in the bonnet 15 and fixed to the upper end inside the bonnet 15, the first core 13 is connected to the bonnet 15.
Will be accurately positioned. Therefore, the coil depth H is ultimately determined by the positional relationship between the second core 14 and the bonnet 15.

In this embodiment, in order to position the second coil 14 on the bonnet 15, the second core 14 is fitted inside the opening of the skirt of the bonnet 15, and
It is only necessary to caulk a part of the skirt of the bonnet 15 in the peripheral groove 14b of No. 4. Therefore, the second core 14 is
5 is accurately positioned mechanically. For this reason,
Sufficient removal strength of the second core 14 from the bonnet 15 can be relatively easily secured. In addition, by appropriately setting the depth of the circumferential groove 14b and the caulking strength of the bonnet 15, the amount of caulking of the bonnet 15 can be easily controlled. For this reason, it becomes possible to easily adjust the coil depth H with the second core 14 with high accuracy.

That is, in each of the above-mentioned conventional solenoid valves, the second core is fixed to the bonnet by an adhesive, R caulking, or screw tightening. However, it was difficult to achieve both the securing of the detachment strength of the second core and the simplification of securing the adjustment accuracy of the coil depth H. In contrast,
According to the solenoid valve 1 of the present embodiment, by employing the caulking method, it is possible to relatively easily ensure a sufficient removal strength of the second core 14 with respect to the bonnet 15, and furthermore, the coil depth The height H can be easily adjusted with high accuracy. From this, the advantage of the solenoid valve 1 of the present embodiment over the conventional solenoid valve is apparent.

In this embodiment, in the assembly process of the solenoid valve 1, the first core 13, the coil assembly 21, and the second core 14 are set inside the bonnet 15, and the bonnet 15 is Is pressed against the work table 26. Accordingly, the coil depth H can be accurately determined only by mechanically matching the distance from the lower end surface 13c of the first core 13 to the bottom surface 14c of the second core 14 with the length of the projecting portion 26b of the work table 26. Can be obtained. further,
With the coil depth H exactly adjusted, bonnet 15
Is caulked in the circumferential groove 14b of the second core 14, so that the coil depth H does not shift during or after the caulking step.

It should be noted that the present invention is not limited to the above-described embodiment, and can be carried out as follows without departing from the spirit of the invention.

In the above embodiment, as shown in FIG. 8A, the peripheral groove 14b formed on the outer periphery of the second core 14 has a rectangular cross section, but as shown in FIG. Section V
The peripheral groove 31 may have a shape.

[0032]

As described above, according to the first aspect of the present invention, the second core is fitted inside the opening of the bonnet,
A bonnet is swaged in the circumferential groove of the second core. For this reason, it is possible to easily adjust the coil depth with high accuracy by the core, and it is possible to relatively easily secure the core withdrawal strength with respect to the bonnet.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an electromagnetic valve according to an embodiment.

FIG. 2 is a cross-sectional view showing a process of assembling an actuator unit.

FIG. 3 is a sectional view showing an assembling process.

FIG. 4 is a sectional view showing an assembling process.

FIG. 5 is a sectional view showing an assembling process.

FIG. 6 is a sectional view showing an assembling step.

FIG. 7 is an enlarged sectional view showing a swaged portion.

8A is a cross-sectional view illustrating a peripheral groove according to an embodiment, and FIG. 8B is a cross-sectional view illustrating a peripheral groove according to another embodiment.

FIG. 9 is a sectional view showing a conventional solenoid valve.

[Explanation of symbols]

 Reference Signs List 1 electromagnetic valve 5 valve seat 11 electromagnetic coil 11a center hole 12 plunger 13 first core 14 second core 14a guide hole 14b circumferential groove 15 bonnet 16 diaphragm (valve body) B body H coil depth

Claims (1)

[Claims] 1. An electromagnetic coil, a first core disposed at one end of a center hole of the electromagnetic coil, and a reciprocating movement toward the end surface of the first core at the other end of the center hole of the electromagnetic coil. A plunger to be moved, and disposed at the other end of the center hole of the electromagnetic coil;
A second core having a guide hole for guiding the movement of the plunger; a valve element provided in the plunger; a body including a valve seat opened and closed by the valve element; the electromagnetic coil; the first core And a bonnet for accommodating the plunger. The bonnet accommodates the electromagnetic coil, the first core and the plunger, and the second hood is provided inside an opening of the bonnet.
An electromagnetic valve in which the coil depth between the first core and the second core is set to a predetermined value by fixing the core of the second core, wherein the second core is provided inside an opening of the bonnet. Mating,
An electromagnetic valve, wherein the bonnet is caulked in a circumferential groove formed on the outer periphery of the second core.