JP2012225407A - Electromagnetic switching valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic switching valve of which spool returns surely during a manual operation and prevents a negative pressure from causing a manual operation pin to be absorbed and displaced during an electromagnetical operation.SOLUTION: The electromagnetic switching valve 10 includes a valve element 11 and solenoid coil parts 12a, 12b which are mounted on both end surfaces of the valve element 11 and generate attraction forces. Plates 37a, 37b, which are fitted to sidewall surfaces in the axial direction of these coil parts 12a, 12b, are fastened to the valve element 11 by the respective mounting bolts 38a, 38b. A tool is inserted into the center parts of sidewall surfaces of tubes 23a, 23b of the solenoid coil parts 12a, 12b via holes 39a, 39b drilled in the plates 37a, 37b. By pressing and pressurizing the tubes 23a, 23b by the tool, the tubes 23a, 23b are moved to switch the solenoid coil parts 12a, 12b manually.

Description

  The present invention relates to an electromagnetic switching valve. When the manual operation pin is operated, the spool is returned reliably by a spring member, and when the electromagnetic operation is performed, the manual operation pin is sucked and displaced by negative pressure. The present invention relates to an improvement in the structure of an electromagnetic switching valve that prevents the above-described problem.

  2. Description of the Related Art Conventionally, an electromagnetic proportional solenoid 40, which is this type of electromagnetic switching valve, includes a coil assembly 41 in which a coil 43 wound around a bobbin 42 and yokes 44 and 45 constituting a coil peripheral circuit body are integrally formed as shown in FIG. A tube assembly 46 disposed in the coil assembly 41, and a cap 53 for connecting the assemblies 41 and 46 to each other. The tube assembly 46 is fixedly formed integrally with a pipe 47 that is attached to the inner peripheral surface of the bobbi 42 and formed in a cylindrical shape, and a nonmagnetic magnetic shielding member 50 on the tip end side of the pipe 47. It has an iron core 51 and a movable iron core 52 that is adsorbed to the fixed iron core 51 and slides inside the pipe 47.

  The cap 53 is formed in a lid shape so as to close the opening of the tube assembly 46, and a female screw 49 that can be screwed to a male screw 48 formed on the outer peripheral surface of the pipe 47 is formed on the inner peripheral surface of one end portion. In addition, a ring-shaped groove into which the end face of the pipe 47 is inserted is formed in the inner central portion, and a manual operation pin 54 is slidably mounted in the central portion via a spring member (not indicated) in the axial direction. (For example, refer to Patent Document 1).

Japanese Patent No. 3362307

However, in Patent Document 1, when the electromagnetic proportional solenoid 40 is manually operated, the manual operation pin 54 is pressed against the elastic force of the spring member using a tool or the like (not shown), and the electromagnetic proportional solenoid 40 is manually operated. When releasing the manual operation pin 54 from the tool or the like, the manual operation pin 54 is surely returned to the initial position by the elastic force of the spring member, and is prevented from being sucked and displaced by the negative pressure. I can't.
Further, since a space for providing the spring member is required, the length of the electromagnetic proportional solenoid 40 is extended as a whole. As a result, the electric proportional solenoid 40 becomes large, resulting in a cost increase.
The present invention has been made to solve the above-described problems, and it is an object of the present invention to provide an electromagnetic switching valve that can easily perform a manual switching operation without using a spring member and has a simplified structure. To do.

In order to achieve the above object, the present invention provides:
A valve body;
A fixed iron core engaged with at least one end surface of the valve body;
A coil portion provided around the fixed iron core and integrally formed with a mold;
A tube member slidably inserted into the inner peripheral surface of the coil portion;
A movable iron core that is slidably inserted into the inner peripheral surface of the tube member and whose shaft portion is slidably supported by the fixed iron core;
A spring member mounted on the fixed iron core and moving the movable iron core in the axial direction by an elastic force when the coil portion is not excited;
In an electromagnetic switching valve with
A plate attached to an end surface of the mold and attached to the valve body integrally with the mold and disposed in proximity to a side wall surface of the tube member;
And moving the tube member in the axial direction by pressing the side wall surface of the tube member with a push-pull member such as a tool from the opening hole formed in the plate to move the non-excited movable core. Features.
In the present invention, even when the frictional resistance between the seal member and the shoe member is large, it is only necessary to add a push-pull member, so that the cost can be reduced and the solenoid valve can be downsized.
According to the invention of claim 2, the push-pull member for pushing and pulling the tube member is fixed to the side wall surface of the tube member, and the push-pull member is moved in the axial direction, so that the tube member is moved reliably. So good.

  According to the present invention, a manual switching operation can be easily performed without using a spring member, and the structure is simplified, so that the cost can be reduced.

It is a longitudinal cross-sectional view which shows schematic structure of the electromagnetic switching valve which concerns on 1st embodiment of this invention. It is a longitudinal cross-sectional view which shows schematic structure of the electromagnetic switching valve which concerns on 2nd embodiment of this invention. It is a longitudinal cross-sectional view which shows schematic structure of the electromagnetic switching valve which concerns on 3rd embodiment of this invention. It is a longitudinal cross-sectional view which shows schematic structure of the conventional electromagnetic proportional solenoid.

An electromagnetic switching valve 10 according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a schematic structure of an electromagnetic switching valve 10 according to a first embodiment of the present invention.
As shown in FIG. 1, the electromagnetic switching valve 10 basically includes a substantially rectangular valve body 11 and solenoid coil portions 12 a and 12 b that are attached to both end faces of the valve body 11 and generate a suction force. It is configured.

In the valve body 11, a spool 15 is slidably inserted into a spool hole 14 formed in the body 13. On both end surfaces (the left side and the right side in FIG. 1) of the body 13, the concave portions 11a and 11b formed coaxially with the spool hole 14 and the convex portions 29a of the solenoid coil portions 12a and 12b, 29b is fitted, and the body 13 and the solenoid coil portions 12a, 12b are liquid-tightly sealed by the seal member 16 of the O-ring.
The body 13 has a pressure port 18 communicating with a pressure supply source (not shown) connected to the spool hole 14, and tank ports 19 a, 19 b communicating with a tank (not shown) spaced apart in the axial direction of the spool hole 14. Channels 20 and 21 that are provided orthogonally and communicate with the spool hole 14 and connect to a hydraulic actuator (not shown) between these ports 18, 19 a, and 19 b are provided orthogonally to the axial direction of the spool hole 14. The tank ports 19a and 19b communicate with each other through a communication path 22.

Since the solenoid coil portions 12a and 12b have the same configuration, only one solenoid coil 12a will be described, and the other solenoid coil portion 12b will be denoted by reference numerals and detailed description thereof will be omitted.
The solenoid coil portion 12a includes a coil portion 17a formed integrally with a mold 28a, which will be described later, and a tube (tube member) 23a having a thin cylindrical shape in the axial direction with the inner peripheral surface of the coil portion 17a as a guide. A fixed iron core 26a with one side (cylindrical side in FIG. 1) fitted into the inner peripheral surface of the tube 23a and the other side (projection 29a in FIG. 1) fitted into the valve body 11, and a large diameter portion Is inserted into the inner peripheral surface of the tube 23a so as to be slidable, and the shaft portion 25a is slidably supported by the fixed iron core 26a, and is fitted to the outer peripheral surface of the coil portion 17a. The inserted coil case 27a and a mold 28a in which the coil portion 17a and the coil case 27a are integrally formed of a resin material are provided.

A thick cylindrical fixed iron core 26a is fitted on the inner peripheral surface of the tube 23a, and a stepped hole 30a is formed on the inner peripheral surface formed on the convex portion 29a of the fixed iron core 26a. Yes. A spring member 32a is attached to the small diameter portion 31a of the stepped hole portion 30a. One side (the left side in FIG. 1) of the spring member 32a is loosely inserted into the outer peripheral portion of the shaft portion 25a of the movable iron core 24a, and one end (the left end in FIG. 1) engages with the end surface of the small diameter portion 31a. The end face of the retainer 35a, whose right side in FIG. 1 is loosely inserted into the outer peripheral portion of the guide portion 33a of the spool 15 and has the same diameter as the shaft portion 25a, and whose other end (right end in FIG. 1) is housed in the large diameter portion 34a. Is engaged.
Reference numeral 36a denotes a spacer inserted into the large-diameter portion 34a, and the lengths of the concave portion 11a and the convex portion 29a so that the concave portion 11a of the valve body 11 and the convex portion 29a of the solenoid coil portion 12a are closely engaged. It has a function to adjust.

The case where the solenoid coil part 12a is attached to the left side surface of the valve main body 11, for example, the recessed part 11a is demonstrated.
First, the spool 15 is slidably fitted into the spool hole 14 of the valve body 11, the spacer 36 a is attached to the recess 11 a of the valve body 11, and the retainer 35 a is fitted to the guide portion 33 a of the spool 15. deep.
Next, after the solenoid coil portion 12a is assembled as shown in FIG. 1, the other side of the spring member 32a guided by the shaft portion 25a of the movable iron core 24a is loosely inserted into the guide portion 33a of the spool 15, and the solenoid coil portion 12a. The convex portion 29 a is fitted into the concave portion 11 a of the valve body 11.

  In this state, a plurality of, for example, four (only two are shown in FIG. 1) mounting bolts 38a, with the rectangular plate-like plate 37a engaged with the back surface (left side in FIG. 1) of the solenoid coil portion 12a. Is loosely inserted into the plate 37a and the solenoid coil portion 12a, and the mounting bolt 38a is screwed to the valve body 11.

Since the electromagnetic switching valve 10 according to the present invention is basically configured as described above, in order to manually operate the non-excited solenoid coil portion 12a, a tool or rod (not shown) is provided in the hole 39a of the plate 37a. When the side wall surface of the tube 23a is pressed with the tool or a rod, the tube 23a starts moving in the arrow X direction with the fixed iron core 26a as a guide.
When the inner wall surface of the tube 23a hits the left end surface of the plunger 24a by the movement of the tube 23a, the end surface of the shaft portion 25a (the right end in FIG. 1) of the plunger 24a is guided by the spool 15 by the movement of the tube 23a and the plunger 24a. Since it abuts against the end surface of the portion 33b, the spool 15 moves in the arrow X direction against the elastic force of the spring member 32b. Therefore, the flow path in the valve main body 11 can be switched by manual switching of the solenoid coil portion 12a by the movement of the tube 23b and the plunger 24b constituting the solenoid coil portion 12b in the arrow X direction.

  On the other hand, in the manual switching of the solenoid coil portion 12a in the arrow Y direction, when the pressing of the tube 23a by a tool or a rod is stopped, the spool 15 is moved in the arrow Y direction by the elastic force of the spring member 32b. With this movement, the guide portion 33a hits the shaft portion 25a of the plunger 24a, and the plunger 24a moves in the arrow Y direction so that the flow path in the valve body 11 can be switched.

Similarly, in order to manually operate the solenoid coil portion 12b, a tool or a rod (not shown) is inserted into the hole 39b of the plate 37b, and when the side wall surface of the tube 23b is pressed with the tool or the rod, the tube 23b is fixed to the fixed core. 26b is used as a guide to start moving in the arrow Y direction.
When the inner wall surface of the tube 23b hits the right end surface of the plunger 24b by the movement of the tube 23b, the end surface (left end in FIG. 1) of the shaft portion 25b of the plunger 24b is guided by the spool 15 by the movement of the tube 23b and the plunger 24b. Since it abuts against the end surface of the portion 33a, the spool 15 moves in the arrow Y direction against the elastic force of the spring member 32a. For this reason, the flow path in the valve main body 11 can be switched by manual switching of the solenoid coil part 12a by the movement of the tube 23a and the plunger 24a constituting the solenoid coil part 12a in the arrow Y direction.

FIG. 2 is a schematic longitudinal sectional view showing a schematic structure of the electromagnetic switching valve 60 according to the second embodiment. FIG. 2 shows a case for solving the case where it is difficult to return to the initial position only by the elastic force of the spring member 32a. In FIG. 2, the same components as those of FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted. The same shall apply hereinafter.
In FIG. 2, instead of pressing the side wall surface of the tube 23a with a tool or a rod, the push / pull member 61a is fixed to the side wall surface of the tube 23a, and the push / pull member 61a is moved by the tool in the direction of the arrow X or Y. To position the tube 23a.

FIG. 3 is a schematic longitudinal sectional view showing a schematic structure of the electromagnetic switching valve 70 according to the third embodiment.
In FIG. 3, a push-pull member 61a having a screw mechanism (not shown) provided on the outer periphery is fixed to the side wall surface of the tube 23a, and a nut member 71a is screwed to the push-pull member 61a.
As a result, the nut member 71a is loosened and the push-pull member 61a is moved in the arrow Y direction or the arrow X direction to displace the tube 23a, and then the nut member 71a is tightened to position the tube 23a in the axial direction.
The electromagnetic switching valves 10, 60, 70 according to the first to third embodiments of the present invention have been described with respect to the case where the solenoid coil portions 12 a, 12 b are attached to both side surfaces of the valve body 11. Alternatively, an electromagnetic switching valve having either one of the solenoid coil portions 12a and 12b attached thereto may be used.

10, 60, 70 Electromagnetic switching valve 11 Valve body 12 Solenoid coil part 13 Body 14 Spool hole 15 Spool 18 Pressure port 19 Tank port 20, 21 Flow path 22 Communication path 23 Tube 24 Movable core 25 Shaft part 26 Fixed iron core 27 Coil case 28 Mold 29 Protruding part 30 Stepped hole part 31 Small diameter part 32 Spring member 33 Guide part 34 Large diameter part 35 Retainer 36 Spacer 37 Plate 38 Mounting bolt 39 Hole 61 Push-pull member 71 Nut member

Claims (2)

A valve body;
A fixed iron core engaged with at least one end surface of the valve body;
A coil portion provided around the fixed iron core and integrally formed with a mold;
A tube member slidably inserted into the inner peripheral surface of the coil portion;
A movable iron core that is slidably inserted into the inner peripheral surface of the tube member and whose shaft portion is slidably supported by the fixed iron core;
A spring member mounted on the fixed iron core and moving the movable iron core in the axial direction by an elastic force when the coil portion is not excited;
In an electromagnetic switching valve with
A plate attached to an end surface of the mold and attached to the valve body integrally with the mold and disposed in proximity to a side wall surface of the tube member;
And moving the tube member in the axial direction by pressing the side wall surface of the tube member with a push-pull member such as a tool from the opening hole formed in the plate to move the non-excited movable core. A characteristic electromagnetic switching valve. The electromagnetic switching valve according to claim 1,
An electromagnetic switching valve, wherein a push-pull member that pushes and pulls the tube member is fixed to a side wall surface of the tube member, and the push-pull member is moved in an axial direction.