JPH05118462A - Solenoid valve - Google Patents

Abstract

PURPOSE:To provide a solenoid value which is far lower and smaller in volume than a conventional manifold type solenoid valve and adjustable with ease through disassembly. CONSTITUTION:The height of the whole of a solenoid valve can be reduced by developing the function of the spring seat body of a valve body spring 13 for urging the valve member for opening and closing a valve seat 21 by the bottom surface 14 of a hole opened on a subplate 37. At this time, a valve member holding member 17 for holding a valve member 41 and the valve body spring 13 is installed favourbly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve used in an industrial machine, and more specifically, a manifold type 3 valve.
One-way solenoid valve is concerned.

[0002]

2. Description of the Related Art Mounting a valve body by using a solenoid valve mounting member such as a sub plate having a plurality of ports to which tubes for transporting fluid are connected is opened.
For example, when a plurality of solenoid valves are attached, it is possible to realize a space saving in which a mounting area can be reduced in a plane, and therefore it is widely used and used in a factory or the like where a working space is desired to be secured. In these solenoid valves, three ports are drilled in the solenoid valve mounting member of the valve body, one of the ports is directly communicated with the valve chamber of the valve body, and the other two ports are installed inside the valve chamber. The two valve seats that are open toward each other communicate with each other. The two valve seats are alternately opened and closed by the valve element fixed to the movable iron core and the valve member driven by the movable iron core and the valve spring to switch the flow direction of the fluid.

However, in the conventional solenoid valve, since the valve spring for urging the valve member toward the movable iron core is supported by the spring seat body housed inside the valve body, the spring seat body is housed. The axial length of the valve body had to be increased by that amount. By the way, these solenoid valves are often used in industrial fields such as manufacturing lines, and in order to secure a working space for workers, the height of the solenoid valve is low at the same time as the area is small in plan view. Is desired. Therefore, the through hole is provided on the solenoid valve mounting member side, and the valve spring spring seat is housed in the cylindrical portion protruding from the lower surface of the valve body.
It is proposed in Japanese Utility Model Publication No. 2-27738 to insert the cylindrical portion into the through hole to reduce the height of the solenoid valve.

FIG. 7 shows the structure of a solenoid valve proposed in Japanese Utility Model Publication No. 2-27738, and the main part of the prior art will be described. The reference numerals indicating the respective constituents are basically the same as those corresponding to FIG. 1 showing the configuration of the present invention, and the description thereof is omitted. The sub-plate 37 is provided with a circular through hole 26 at the center position where the solenoid valve 1 is attached, and two other through holes 27 and 28 are provided around the circular through hole 26. These three through holes 26, 27, 28 are in communication with the respective ports of the three-way solenoid valve opened in the sub plate.

The lower surface of the solenoid valve constitutes a sub plate mounting surface 32. A cylindrical portion 44 projects toward the outside of the solenoid valve at the center of the sub-plate mounting surface 32 of the solenoid valve. Inside the cylindrical portion 44, a spring seat 45 for stopping the lower end of the valve spring 13 and receiving a spring force is attached. In this manner, the spring seat body 45 is attached to the inside of the cylindrical portion 44 protruding from the solenoid valve body, and with the solenoid valve body attached to the sub-plate 37, the cylinder portion 44 is positioned below the valve body attachment surface 33 of the sub-plate 37. Since it is located at, the height of the solenoid valve can be reduced as a whole.

[0006]

However, there has been a strong demand from consumers to further reduce the height of the solenoid valve. For example, when an air cylinder is used as an actuator in a robot hand or the like, a solenoid valve may be directly attached to the robot hand in order to improve the responsiveness of the air cylinder. In this case, the robot hand may operate in a narrow space in order to perform work, and it is required to make the entire solenoid valve as small as possible in volume. In such a case, the solenoid valve proposed in Japanese Utility Model Publication No. 2-27738 is often insufficient.

On the other hand, the conventional solenoid valve and the actual fair 2-27
In the solenoid valve proposed in Japanese Patent No. 738, the spring seat body 45 of the valve body spring 13 is fixed to the valve body, and it is extremely difficult to remove the valve body spring 13 and the like. Therefore, it is difficult to disassemble the valve body 11, the valve body spring 13 and the like for adjustment, and to replace the defective component. Therefore, if a malfunction occurs in the valve body 11 or the like, the solenoid valve 1 as a whole must be replaced, which causes a cost increase. The valve body 11 and the like are important parts that constitute the solenoid valve, and at the same time are parts that are driven violently, and often cause problems, and although it is desired to disassemble and adjust them, In the past, disassembly and adjustment were extremely difficult.

The present invention has been made to solve the above-mentioned problems, and is intended to provide a solenoid valve which is taller and smaller in volume than conventional solenoid valves, and which is easy to disassemble and adjust. The purpose is to provide.

[0009]

In order to achieve this object, the solenoid valve of the present invention is used by mounting it on a solenoid valve mounting member, which is provided at the center of the solenoid valve mounting member surface of the valve body. A valve chamber is directly communicated with one port opened in the solenoid valve mounting member, and the other two ports opened in the solenoid valve mounting member.
With two ports communicating with the valve chamber through two valve seats that open in the valve chamber, and the two valve seats are driven by a valve body fixed to the movable iron core and the movable iron core and a valve spring. A solenoid valve in which the flow direction of the fluid can be switched by alternately opening and closing with a member, and is opened at the solenoid valve mounting surface of the solenoid valve mounting member at a position corresponding to the valve chamber at the center of the valve body. The spring seat of the valve spring is provided in the recess.

Further, in the above solenoid valve, a holding member for integrally holding the valve member and the valve spring is provided on the valve body.

[0011]

In the solenoid valve of the present invention having the above means, the valve body does not have the spring seat of the valve spring, and the spring seat constituted by the solenoid valve mounting surface of the sub-plate has the spring force of the valve spring. Is receiving. Since such a structure is adopted, the height of the solenoid valve can be reduced. The valve chamber at the center of the solenoid valve mounting member surface of the valve body communicates directly with one port opened in the solenoid valve mounting member, and the other two ports opened in the solenoid valve mounting member are valves. 2 open to the room
It communicates with the said valve chamber through two valve seats. Then, the two valve seats are alternately opened and closed by a valve member driven by a movable iron core of a solenoid portion and a valve spring to switch the fluid flow direction.

Further, when the above construction is adopted, there is a concern that the valve body or the like may fall during assembly. However, in the solenoid valve of the present invention, the valve member holding member holds the valve body and the like and prevents the fall. There is.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A manifold type solenoid valve according to an embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view showing the structure of a manifold type solenoid valve. The solenoid valve 1 is composed of a solenoid portion 15 including the coil 2, a valve body 8 and a sub plate 37 which is a solenoid valve mounting member. The solenoid portion 15 and the valve body 8 are integrated by two mounting screws 16.

The solenoid portion 15 includes a coil 2 in which a copper wire is wound around an outer circumference of a hollow cylindrical coil bobbin 36 whose both ends are spread outward, and a fixed iron core fixed to the upper side of the hollow portion of the coil bobbin 36. After assembling 4, etc., resin 34 is injected and solidified. Coil bobbin 36
The movable iron core 3 is inserted under the hollow portion of the.

Two positioning projections 24 are formed on the sub-plate mounting surface 32, which constitutes the lower surface of the valve body 8, at positions other than the port through holes. And the sub plate 3
Positioning recess 2 for fitting the positioning protrusion 24 at a position corresponding to the positioning protrusion on the solenoid valve mounting surface 33 of No. 7
Two 5 are provided. These two sets of positioning protrusions 2
The valve body 8 and the sub-plate 37 can be accurately positioned by fitting the positioning recess 4 and the positioning recess 25 together. As a result, the positions of the three ports are also accurately positioned, so that fluid leakage and the like can be eliminated.

The valve body 8 has circular holes halfway open at the central positions of the upper portion and the lower portion, respectively, and the solenoid valve mounting surface 3 of the solenoid portion 15 and the sub-plate 37 is respectively provided.
An upper valve chamber 19 and a lower valve chamber 39 are formed together with the central position through hole 26 opened corresponding to the central portion of the solenoid valve mounting position of No. 3. The upper valve chamber 19 and the lower valve chamber 39 are communicated with each other through a communication hole (not shown). Upper valve chamber 1
A through hole 22 is formed at the center position of the lower surface of the plate 9, and an upper valve seat 20 is formed at the inlet of the through hole 22 in a shape protruding upward. The through hole 22 communicates with the “normally closed” port 30 of the sub plate 37 through the port through hole 28. A through hole 23 is formed at a central position on the upper surface of the lower valve chamber 39, and a lower valve seat 21 is formed at the inlet of the through hole 23 so as to project downward. The through hole 23 communicates with the “normally open” port 31 of the sub plate 37 through the port through hole 27. The central position through hole 26 communicates directly with the "common" port 29.

An upper valve body 6, which is one of the valve members, is in contact with the upper valve seat 20 of the upper valve chamber 19 when the coil 2 is not excited. The upper valve body 6 is formed of an elastic body such as rubber, and is fixedly attached to one end of the movable iron core 3 so as to be incorporated therein. The movable iron core 3 is fitted into the center hole of the coil bobbin 36 from below via the guide sleeve 35, and is vertically slidable. The lower end of the movable iron core 3 extends outward to form a spring seat 3a. The return spring 7 has a lower end in contact with the spring seat portion 3 a of the movable iron core 3 and another end in contact with the guide sleeve 35. The return valve 7 biases the upper valve element 6 in a direction in which it contacts the upper valve seat 20. The O-ring 5 is sandwiched and fixed between the valve body 8 and the guide sleeve 35 so as to surround the upper valve chamber 19.

The lower valve body 11 is in contact with the lower valve seat 21 of the lower valve chamber 39 while the coil 2 is excited. The lower valve body 11 is made of an elastic body such as rubber and is reinforced and fixed to the plastic valve body holding member 12 by the metal plate 10 and the metal plate 40. Two cylindrical valve body guides 9 are fixed to the valve body holding member 12. Lower valve body 11, valve body holding member 12, metal plates 10, 4
0 and the valve body guide 9 constitute a valve member 41.
The valve member 41 is fitted in the guide hole 38 by the valve body guide 9 so as to be vertically slidable. The end of the valve body guide 9 is
The movable core 3 is in contact with the spring seat 3a on the side opposite to the side with which the spring is in contact.

On the lower surface of the valve body holding member 12, there is formed a cylindrical portion 12a having a diameter slightly larger than the inner diameter of the valve body spring 13 which is a coil spring. The valve body spring 13 is inserted in the cylindrical portion 12a. Therefore, the valve member 41 and the valve body spring 13 are usually integrated. The other end of the valve body spring 13 has a central position through hole 26 opened in the sub plate 37.
Is in contact with the valve body spring seat 14 constituted by the lower surface of the. The valve body spring 13 connects the lower valve body 11 to the lower valve seat 21.
Is urged in the direction of abutting against.

A valve member holding member 17 having a lower end bent in a convex shape is fixed to an outer peripheral position on the upper surface of the lower valve chamber 39 where the valve member 41 is attached. When the valve body 8 and the sub-plate 37 are separated, the one in which the valve member 41 including the valve body 11 and the valve body spring 13 are integrated is about to fall. The valve member holding member 17 includes the valve member 41 and the valve body spring 1.
Although it is integrated with 3, it is prevented from falling.

Another embodiment of the valve member holding member is shown in FIGS. 3 and 4. The valve member 41 is inserted into the valve body 8 at the center position of the sub-plate attachment surface 32, and the valve body spring 13 is attached to the cylindrical portion 12 a of the valve member 41. Thereby, the valve member 41 and the valve body spring 13 are integrated. The valve member holding member 43 is made of thin wire, and is, as shown in FIG. 4, a circumferential portion that is compressed in a circular shape and inserted into the lower valve chamber 39 to be fixed so as to expand outward. 43b and a valve member holding portion 43a that holds the valve member 41 and the valve body spring 13 in FIG. The valve member holding member 43 is easily attached to and detached from the valve body 8, and is convenient when disassembling and adjusting the lower valve body 11 and the like.

Still another embodiment of the valve member holding member is shown in FIG.
And shown in FIG. The valve member 41 is inserted into the valve body 8 at the center position of the sub-plate mounting surface 32.
A valve spring 13 is attached to the cylindrical portion 12a. Thereby, the valve member 41 and the valve body spring 13 are integrated. The valve member holding member 42 is made of a leaf spring, and as shown in FIG. 5, the fixed end 42a is press-fitted and fixed to the valve body 8. The valve member holding portion 42b holds the valve member 41 and the valve body spring 13 as shown in FIG. Since the valve member holding members 17, 43, 42 are provided, the valve body 8
Since the valve member 41 and the valve body spring 13 are held by the valve body holding members 17, 43, and 42 even when they are separated from the sub-plate 37, they do not fall.

Next, the operation of the solenoid valve having the above-described structure will be described. 1 shows the state when the coil 2 is not excited, and FIG. 2 shows the state when the coil 2 is excited. First, the case of non-excitation will be described. As shown in FIG. 1, the movable iron core 3 is biased downward by a return spring 7. As will be described later, the valve body spring 13 urges the movable iron core 3 upward, but since the spring force of the return spring 7 is larger than the spring force of the valve body spring 13, the movable iron core 3 is The body 6 is pressed against the upper valve seat 20.

The movable iron core 3 also contacts the valve body guide 9 to push the valve body guide 9 downward. The valve body guide 9 is fitted in the guide hole 38 of the valve body 8 and moves in parallel downward. The valve body guide 9 constitutes the valve member 41, and therefore the valve member 41 is biased downward. On the other hand, the valve member 41 is biased upward by the valve body spring 13 whose one end abuts on the sub plate 37. However, since the spring force of the return spring 7 is larger than the spring force of the valve body spring 13, the lower valve body 11 is pushed down to a position away from the lower valve seat 21. As a result, the “common” port 29 communicates with the “normally open” port 31 through the lower valve chamber 39, the lower valve seat 21, the through hole 23, and the port through hole 27. Fluid flows to the “normally open” port 31.

Next, the case where the coil 2 is excited will be described. As shown in FIG. 2, the movable iron core 3 has a return spring 7
However, since the electromagnetic force generated by energizing the coil 2 is larger than the spring force of the return spring 7, the movable iron core 3 is attracted upward and is in contact with the fixed iron core 4. As a result, the upper valve body 6 is located away from the upper valve seat 20.

Since the movable iron core 3 does not push down the valve body guide 9, the valve body guide 9 is pushed upward by the valve body spring 13. The valve member 41 is biased upward by the valve body spring 13 whose one end abuts on the sub plate 37.
As a result, the “common” port 29 is connected to the lower valve chamber 39,
The fluid from the “common” port 29 communicates with the “normally closed” port 30 through a not-shown through hole, the upper valve seat 20, the through hole 22, and the port through hole 28.
It flows to 0.

According to such an electromagnetic valve, the valve body spring 13
Since the function of the spring seat body is also given to the side of the sub-plate 37, the height of the solenoid valve in the state of being incorporated in the sub-plate 37 can be lowered, and the solenoid valve can be downsized as a whole to secure a working space and the like. It will be easy. In this case, when the solenoid valve main body is attached to the sub plate 37, the valve member 41 and the valve body spring 13 tend to fall, which may make the attachment operation difficult. Since the valve body holding members 17, 42 and 43 are attached, the valve body and the like do not drop, and the attachment work or the like can be easily performed.

Further, according to this embodiment, since the valve member 41 and the valve body spring 13 can be easily removed,
Even if a malfunction occurs in the lower valve body 11 or the like, adjustment can be performed, and since only the lower valve body 11 and the like need to be replaced, it is not necessary to replace the entire solenoid valve and the cost can be reduced. In the present embodiment, the valve member holding member is separately provided, but the diameter of the upper end portion of the valve body guide 9 may be slightly increased so that the guide hole 3 is formed.
The friction with 8 may be increased to prevent the valve body from dropping.
Further, in the present embodiment, the spring force of the valve body spring 13 is directly received by the valve body spring seat body 14 formed by the surface of the sub plate 14, but an independent spring seat body may be attached to the sub plate 14. ..

[0029]

As is clear from the above description,
According to the solenoid valve of the present invention, at the position corresponding to the port at the center of the valve body, the spring seat body of the valve spring is provided in the recess opening in the solenoid valve mounting surface of the mounting member. The height of the solenoid valve can be reduced, and a sufficient working space can be secured even when the solenoid valve is attached. Further, the valve body and the valve body spring can be easily removed, and maintenance of the solenoid valve and the like are facilitated.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a solenoid valve according to an embodiment of the present invention in a non-excited state.

FIG. 2 is a cross-sectional view showing a configuration of a solenoid valve according to an embodiment of the present invention in an excited state.

FIG. 3 is a rear view of an electromagnetic valve showing a second embodiment of the valve body holding member.

FIG. 4 is a perspective view showing a second shape of the valve body holding member.

FIG. 5 is a rear view of a solenoid valve showing a third embodiment of the valve body holding member.

FIG. 6 is a perspective view showing a third shape of the valve body holding member.

FIG. 7 is a cross-sectional view showing the structure of a conventional solenoid valve.

[Explanation of symbols]

 1 solenoid valve 2 coil 3 movable iron core 6 upper valve body 7 return spring 8 valve body 9 valve body guide 11 valve body 13 valve body spring 14 valve body spring seat body 17 valve member holding member 20 upper valve seat 21 lower valve seat 24 positioning Protrusion 25 Positioning hole 29 "Common" port 30 "Normally closed" port 31 "Normally open" port 37 Sub-plate 41 Valve member 45 Spring seat

Claims (2)

[Claims] 1. A solenoid valve mounting member for use, wherein a valve chamber at the center of the solenoid valve mounting member surface of the valve body is directly communicated with one port opened to the solenoid valve mounting member. The other two ports opened in the solenoid valve mounting member are communicated with the valve chamber through the two valve seats opened in the valve chamber, and the two valve seats are fixed to the movable iron core. And a solenoid valve in which a valve member driven by a movable iron core and a valve spring is alternately opened and closed to switch the flow direction of the fluid, in a position corresponding to the central valve chamber of the valve body, A solenoid valve, wherein a spring seat of the valve spring is provided in a recessed portion of the solenoid valve mounting member which is open on the solenoid valve mounting surface. 2. The electromagnetic valve according to claim 1, further comprising a holding member that integrally holds the valve member and the valve spring with respect to the valve body.