JPH1047525A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve which can well reduce a contact resistance value between an earthing connection metal fixture and a valve main unit. SOLUTION: In an electromagnetic device 6 removably mounted in a valve main unit 1 so as to come into contact with a side surface of the valve main unit 1 to operate a valve element 3, connection metal fixtures 14A, 14B electrically connected to an electromagnetic coil 12 and an earthing metal fixture 15 are protrusively provided upward, the connection metal fixture 15 is provided to be electrically connected to a case 19 as a magnetic path constitutional member constituting a magnetic path of attracting force attracting a movable core 10 to a fixed core 7, the case 19, by mounting it in the valve main unit 1 of the electromagnetic device 6, directly comes into contact with the valve main unit 1, and, so as to make electric connection, an end part is exposed in a contact surface 6D of the electromagnetic device 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic valve operated by an electromagnetic device in which a valve body provided inside a valve body is attached to the valve body.

[0002]

2. Description of the Related Art Conventionally, there is a solenoid valve of this type shown in FIGS. This valve has a valve body 3 movably housed inside a metal valve body 1 having a rectangular parallelepiped shape, and an electromagnetic device 40 is provided so as to be detachably attached to a side surface of the valve body 1. The device 40 includes two connection fittings 14A electrically connected to the electromagnetic coil 12 via the lead wire 13,
14B and a connection fitting 15 for ground are protruded upward, an external power supply is electrically connected to the connection fittings 14A and 14B. Move rightward, and move this pin
1, the valve body 3 is transmitted to the valve body 3 to operate it. The grounding fitting 15 is connected to the electromagnetic device 40.
And is provided to be electrically connected to the valve body 1 via the valve.

[0003]

However, in such a conventional solenoid valve, a metal case 41 (as a magnetic path constituting member for covering the outer periphery of the electromagnetic coil 12) is provided between the grounding fitting 15 and the valve body 1. It is electrically connected to the connection fitting 15 by the lead wire 20.), and a disk-shaped metal yoke 1 as a magnetic path constituting member abutting on an axial end of the case 41.
8, a cylindrical portion of a magnetic cover member 9 in which a movable core 10 is movably housed by inserting a yoke 18 therein, a non-magnetic cylindrical member 8, and an electromagnetic device which is welded and fixed to the cylindrical member 8. 41 is electrically connected to the valve body 1 via a fixed iron core 7 which is screwed to the valve body 1 so as to be detachably attached to the valve body 1. The case 41, the yoke 18, the electromagnetic coil 12, the respective fittings 14A, 14B,
Since the coil block 40C is integrally formed by molding the resin block 15 with resin, the resin may enter between the case 41 and the yoke 18, or the fixed iron core 7, the cylindrical member 8, the lid member 9
The coil block 40C is externally fitted to the plunger block 40A configured by welding and fixing, so that a small gap is formed between the yoke 18 of the coil block 40C and the cylindrical portion of the lid member 9 of the plunger block 40A and the cylindrical member 8. And the contact resistance between the grounding fitting 15 and the valve body 1 was high and could not be satisfied.

An object of the present invention is to provide an electromagnetic valve capable of favorably reducing the contact resistance between a grounding fitting and a valve body.

[0005]

According to a first aspect of the present invention, there is provided a solenoid valve having a metal valve body accommodating a valve body therein, and a detachably attached to the valve body so as to abut against a side surface of the valve body. An electromagnetic device that operates a valve body by operating the electromagnetic device.The electromagnetic device has a connection fitting for electrically connecting to the electromagnetic coil and a connection fitting for ground protruding upward, and the connection fitting, the electromagnetic coil, and the electromagnetic coil are energized. A magnetic path constituting member for forming a magnetic path of an attractive force for adsorbing the movable iron core to the fixed iron core is molded and integrally molded with a resin, and a grounding fitting is provided in electrical connection with the magnetic path constituting member. The path component has an end exposed at a contact surface of the electromagnetic device with the valve body so as to directly contact with and electrically connect with the valve body when the electromagnetic device is mounted on the valve body.

According to a second aspect of the present invention, there is provided an electromagnetic valve in which a metal valve body accommodating a valve body therein and an electromagnetic valve which is detachably attached to the valve body so as to abut on a side surface of the valve body to operate the valve body. The electromagnetic device is provided with a connecting member electrically connected to the electromagnetic coil and a connecting member for ground protruding upward, and a connecting member for ground is provided by electrically connecting a connecting member. A metal path component constituting a magnetic path of an attractive force for attracting the movable iron core to the fixed iron core by energizing the bracket, the electromagnetic coil, and the electromagnetic coil is molded and integrally formed with resin, and the connection member is provided in the electromagnetic device. An end of the electromagnetic device is exposed at a contact surface to the valve body so that the electromagnetic device is brought into direct contact with and electrically connected to the valve body when attached to the valve body.

In the configuration of claim 1 of the present invention,
When the electromagnetic device is mounted on the valve body, the magnetic path component that is electrically connected to the grounding fitting directly contacts the valve body. In the configuration of the second aspect, when the electromagnetic device is attached to the valve body, the connection member that is electrically connected to the grounding fitting directly contacts the valve body. For this reason, in both of the solenoid valves according to the claims, the grounding fitting can be electrically connected to the valve body directly from the magnetic path constituting member or the connecting member, and thus the contact resistance value between the grounding fitting and the valve body. Can be favorably reduced.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention, and the same parts as those in the conventional example shown in FIGS. 5 and 6 are denoted by the same reference numerals. Reference numeral 1 denotes a metal valve body which is provided in a rectangular parallelepiped shape, has a supply passage P, two load passages A and B, and a discharge passage R with a gap in the axial direction therein, and each passage P,
A receiving hole 2 is provided so as to intersect with A, B, and R, and the receiving hole 2 is provided to open on both opposite side surfaces of the valve body 1. Reference numeral 3 denotes a valve body which is slidably fitted into the receiving hole 2 of the valve body 1 and provided.
Switching between the respective flow paths P, A, B, and R is controlled by operation in the axial direction. Reference numeral 4 denotes a lid member, which is detachably attached to one side surface of the valve body 1 by screwing so as to close one opening of the receiving hole 2.

Reference numeral 6 denotes an electromagnetic device, which is provided with a receiving hole 2 on the other side opposite to the one side on which the cover member 4 of the valve body 1 is mounted.
A cylindrical plunger block 6A detachably attached by screwing so as to close the other opening of the plunger block, and a nut member 6B which is fitted to the plunger block 6A and screwed to the outer end of the plunger block 6A. And a coil block 6C to which the contact surface 6D abuts and is fixed to the other side surface of the valve body 1 by tightening.

The plunger block 6A is provided with a non-magnetic cylindrical member 8 fixedly welded to a cylindrical fixed magnetic core 7 and a magnetic lid member 9 having a cylindrical portion at an end of the cylindrical member 8. A magnetic movable core 10 adsorbed to the fixed core 7 is inserted and movably inserted in the axial direction inside the cylindrical portions of the tubular member 8 and the lid member 9 so as to be movable in the axial direction.
The movement of 0 is transmitted to the valve body 3 via the pin member 11 to operate and provide the valve body 3.

The coil block 6C has connecting fittings 14A and 14B electrically connected to the electromagnetic coil 12 by the lead wire 13 and a connecting fitting 15 for ground protruding upward.
The connection fittings 14A, 14B, 15, the electromagnetic coil 12, a resin coil bobbin 17 around which the electromagnetic coil 12 is wound, and a magnetic path of an attractive force for attracting the movable core 10 to the fixed iron core 7 by energizing the electromagnetic coil 12. A metal yoke 18 and a case 19 as magnetic path constituting members are molded and integrally formed with resin. The yoke 18 is provided at the axial end of the coil bobbin 16 with a hole through which a cylindrical portion of the lid member 9 is inserted by stacking a plurality of disk-shaped plate members.
The case 19 is formed in a cylindrical shape that covers the outer periphery of the coil bobbin 17, and its axial end abuts on the yoke 18 so as to pass through the lead wire 13 that electrically connects the electromagnetic coil 12 and the connection fittings 14A and 14B. A part of the direction is cut out.

Further, a case 19 is provided by being electrically connected to a grounding fitting 15 by a lead wire 20 which is molded and integrally molded with a resin, and an end opposite to an axial end contacting the yoke 18 is provided. The end exposed on the contact surface 6D when the electromagnetic device 6 is mounted on the valve main body 1 is directly in contact with the valve main body 1 and electrically connected thereto. It is preferable to apply rust preventive oil to the end of the case 19 exposed on the contact surface 6D. 21A and 21B are springs for urging the valve body 3 to the neutral position, 22 is a sealing member exposed between the contact surface 6D and interposed between the plunger block 6A and the coil block 6C, and 23 is fitted around the plunger block 6A. The seal members 22 and 23 are provided between the coil block 6C and the nut member 6B to prevent liquid such as water droplets from entering the electromagnetic device 6 from the outside. 24
Is a push button member for manual operation provided on the lid member 9 of the plunger block 6A.

Next, the operation of the above configuration will be described. To operate the solenoid valve, the connection fittings 14A and 14B are connected to an external power supply, and the connection fitting 15 for grounding is connected to the ground of the external power supply. 1 shows a state in which the electromagnetic coil 12 is not energized, the valve element 3 is held at the neutral position by the springs 21A and 21B, and the supply path P is switched to the load path A to control the load path. B is switched to the discharge channel R.

When the electromagnetic coil 12 is energized from the state shown in FIG. 1, the movable core 10 is attracted to the fixed core 7 and moves rightward in FIG. 1, and this movement is transmitted to the valve body 3 via the pin member 11. The valve body 3 operates to the right in FIG. 1 against the force of the spring 21A to control the switching of the supply flow path P to the load flow path B and to control the switching of the load flow path A to the discharge flow path R.

When the electromagnetic coil 12 is de-energized while the valve element 3 is moving to the right in FIG.
Is released, and the valve element 3 returns to the state shown in FIG. 1 by the force of the spring 21A.

With this operation, the electromagnetic device 6 for operating the valve body 3 is attached to the valve main body 1 so as to be connected to the grounding fitting 15.
And the case 19 electrically connected by the lead wire 20 directly contacts the valve body 1. For this reason, since the grounding fitting 15 can be electrically connected to the valve body 1 directly from the case 19,
The contact resistance value between the grounding fitting 15 and the valve body 1 can be reduced favorably. Further, by reducing the contact resistance value, it is possible to reduce the danger to the operator even if the electromagnetic device 6 leaks during handling of the solenoid valve. Furthermore, the configuration may be such that the end of the case 19 is exposed to the abutting surface 6D, and the number of components can be increased as compared with the conventional solenoid valve, so that the configuration can be prevented from becoming complicated.

FIGS. 3 and 4 show another embodiment of the present invention. The same portions as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Only different portions will be described. An electromagnetic device 26 removably attached to the valve body 1 comprises a plunger block 26 removably attached to the other side of the valve body 1.
A and a coil block 26C which is fitted to the outside of the plunger block 26A and is fixed by abutment surface 26D in contact with the other side surface of valve body 1 by fastening nut member 26B.

The plunger block 26A is provided with a non-magnetic cylindrical member 28 fixedly welded to a fixed magnetic core 27 having a cylindrical shape, and a magnetic lid member 29 having a cylindrical portion at the end of the cylindrical member 28. A magnetic movable core 30 attracted to the fixed core 27 is inserted into the cylindrical portions of the tubular member 28 and the lid member 29 so as to be movable in the axial direction. Is transmitted to the valve element 3 via the pin member 31 to operate the valve element 3. The electromagnetic device 26 is for alternating current, and has a hollow coil 32 provided on the attracting surface of the fixed iron core 27 on which the movable iron core 30 is attracted.

The coil block 26C has connecting metal fittings 35A and 35B electrically connected to the electromagnetic coil 33 by lead wires 34 and a connecting metal fitting 36 for ground protruding upward, and the connecting metal fitting 36 for earthing has a metal connecting member. 37 are provided in an electrically connected manner, and the lead wire 34, each of the fittings 35A, 35B, 36,
The electromagnetic coil 33, the connecting member 37, the coil bobbin 38 around which the electromagnetic coil 33 is wound, and a metal as a magnetic path constituting member that forms a magnetic path of an attractive force for attracting the movable iron core 30 to the fixed iron core 27 by energizing the electromagnetic coil 33. Yoke 39 made of resin is molded and integrally formed. The yoke 39 is formed by laminating a plurality of substantially quadrangular plate members to form a coil bobbin 38.
And the plunger block 26
A is provided so as to be freely inserted. The connecting member 37 is provided by soldering to the lower end of the grounding fitting 36, one end in the axial direction is bent downward, and the bent end is exposed in close contact with the contact surface 26D. The end exposed on the contact surface 26 when the electromagnetic device 26 is attached to the valve body 1 directly contacts the valve body 1 to be electrically connected.

The operation is similar to that of the first embodiment.
A and 35B are connected to an external power supply, and a grounding fitting 36 is connected to the ground of the external power supply. Then, the energization of the electromagnetic coil 33 causes the movable iron core 30 to be attracted to the fixed iron core 27 and to move rightward in FIG.
Switching between A, B and R is controlled.

With this operation, the electromagnetic device 26 for operating the valve body 3 is attached to the valve body 1 and is connected to the grounding fitting 3.
The connection member 37 electrically connected to the valve body 6 directly contacts the valve body 1. For this reason, the connection metal fitting 36 for the ground is
Since the electrical connection can be made directly to the valve body 1 from the valve 7, the contact resistance value between the grounding fitting 36 and the valve body 1 can be reduced favorably. Further, similarly to the embodiment, the danger to the worker can be reduced even if the electromagnetic device 26 leaks by reducing the contact resistance value.

In each embodiment of the present invention, the valve body 1
Although one electromagnetic device 6, 26 is mounted in contact with the side surface of the valve body, two electromagnetic devices may be mounted opposite to both side surfaces of the valve body. In another embodiment, the connection member 3
7 is exposed in close contact with the contact surface 26D. However, the end bent below the connection member may be separated from the contact surface and exposed to be elastically deformable. The good thing is, of course.

Now, for a solenoid valve (6 pieces) corresponding to the embodiment shown in FIGS. 1 and 2, a current of 10 A (ampere) is passed from the grounding fitting 15 to the valve body 1,
When the voltage drop between the grounding fitting 15 and the valve body 1 was measured, the lowest solenoid valve was 0.01236 V (volt) and the highest solenoid valve was 0.01896 V.
When the contact resistance value between the grounding fitting 15 and the valve body 1 is calculated from this result, the lowest value is 0.01236.
/ 10 = 0.001236Ω (ohms), the highest being 0.01896 / 10 = 0.001896Ω,
When a current of 10 A flows from the grounding fitting to the valve body, the contact resistance between the grounding fitting and the valve body is 0.
The standard value of 1Ω or less could be satisfied.

Similarly, for a solenoid valve (25 pieces) corresponding to the other embodiments shown in FIGS. 3 and 4, a current of 10 A flows from the grounding fitting 36 to the valve body 1 to connect to the ground. When the voltage drop between the metal fitting 36 and the valve body 1 was measured, the lowest voltage was 0.008 V and the highest voltage was 0.014 V. From this result, when the contact resistance value between the ground connection fitting 36 and the valve body 1 is calculated, the lowest one is 0.008 / 10 = 0.0008Ω, and the highest one is 0.014 / 10 = 0.0014Ω. The above-mentioned standard values could be satisfied.

Similarly, for a solenoid valve corresponding to the conventional example shown in FIGS. 5 and 6, a grounding fitting 15 and a valve body 1 are provided.
When the contact resistance value between them was determined, the above-mentioned standard value could not be satisfied.

When measuring the solenoid valve according to one embodiment and the solenoid valve according to another embodiment, the tightening torque of the nut members 6B and 26B is set to 3.9 to 4.9 N.
・ By managing in the range of m (Newton meter),
It was found that the contact resistance could be stabilized.

[0027]

As described above, according to the present invention, in the solenoid valve according to the first and second aspects, the earthing connection metal can be electrically connected to the valve body directly from the magnetic path constituting member or the connecting member. The contact resistance value between the connection fitting and the valve body can be satisfactorily reduced, and the standard value can be satisfied. Further, by reducing the contact resistance value, it is possible to reduce the danger to the operator even if the electromagnetic device leaks while handling the solenoid valve.

Further, in the solenoid valve of the first aspect, the end of the magnetic path constituting member may be exposed to the contact surface of the electromagnetic device, and the number of parts is not increased as compared with the conventional solenoid valve. Thus, complication of the configuration can be satisfactorily prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a solenoid valve according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a longitudinal sectional view of a solenoid valve according to another embodiment of the present invention.

FIG. 4 is a sectional view taken along line BB in FIG. 3;

FIG. 5 is a longitudinal sectional view of a solenoid valve showing a conventional example.

FIG. 6 is a sectional view taken along line CC of FIG. 5;

[Description of Signs] 1 valve body 3 valve body 6, 26 electromagnetic device 7, 27 fixed iron core 6D, 26D contact surface 10, 30 movable iron core 12, 33 electromagnetic coil 14A, 14B, 15, 35A, 35B, 36 connection fitting 18, 39 yoke (magnetic path component) 19 case (magnetic path component) 37 connecting member

Claims (2)

[Claims] 1. An electromagnetic device comprising: a metal valve body accommodating a valve body therein; and an electromagnetic device detachably attached to the valve body so as to abut on a side surface of the valve body to operate the valve body. A connecting metal for electrical connection to the electromagnetic coil and a connecting metal for ground protrude upward to form a magnetic path of attractive force that attracts the movable core to the fixed core by energizing each connecting metal, electromagnetic coil, and electromagnetic coil. The magnetic path component to be formed is molded integrally with resin and provided as an integral part, the grounding fitting is provided electrically connected to the magnetic path component, and the magnetic path component is directly attached to the valve body of the electromagnetic device. An electromagnetic valve having an end exposed at a contact surface of the electromagnetic device with the valve body so as to be in electrical contact with the valve body. 2. An electromagnetic device comprising: a metal valve body accommodating a valve body therein; and an electromagnetic device detachably attached to the valve body so as to abut on a side surface of the valve body to operate the valve body. A connection fitting electrically connected to the electromagnetic coil and a connection fitting for ground are protruded upward, and a connection member is provided on the connection fitting for ground by electrically connecting the connection fitting, each connection fitting, the electromagnetic coil, and the electromagnetic coil. A magnetic path constituting member that forms a magnetic path of an attraction force that attracts the movable core to the fixed core by energizing the resin is molded and integrally molded with a resin, and the connecting member is directly attached to the electromagnetic device by attaching it to the valve body. An electromagnetic valve having an end exposed at a contact surface of the electromagnetic device with the valve body so as to be in electrical contact with the valve body.