JPH0632865U - solenoid valve - Google Patents

Abstract

(57) [Abstract] [Purpose] Particularly in a double solenoid type solenoid valve in which the solenoid is provided on one side of the main valve body, a minute gap between the lower iron core of the solenoid and the bobbin for the solenoid coil is efficiently configured. Provide a solenoid valve that can A double solenoid type solenoid valve having a solenoid portion coupled to only one side of a main valve body portion, the main valve body portion having a main shaft housed so as to be displaceable along an axial direction, and this main valve It is composed of a solenoid portion or the like that generates a pressing force for displacing the main shaft of the main body portion. In this solenoid part, two sets of a first solenoid and a second solenoid are built in parallel inside thereof, and a lower iron core 2 forming a magnetic path is formed.
9 is provided with a groove portion 29b, and a flange of the bobbin of the solenoid coil is provided with a convex portion which is fitted in the groove portion 29b on the lower iron core 29. Further, the opening 29a of the lower iron core 29
The inner diameter Φ1 of is slightly larger than the inner diameter of the shaft hole of the bobbin.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a solenoid valve, and in particular, in a double solenoid type solenoid valve in which a solenoid portion is provided only on one side of a main valve body portion, a minute gap between a lower iron core and a solenoid coil bobbin in the solenoid portion can be efficiently formed. The present invention relates to a technology effectively applied to an electromagnetic valve that enables

[0002]

[Prior art]

 For example, a double solenoid type solenoid valve includes a main valve main body having a main shaft that is housed so as to be displaceable along the axial direction, and a solenoid that generates a pressing force with which the main shaft of the main valve main body is displaced. A solenoid valve of the spool type indirectly operated type is provided, in which the solenoid section is coaxially coupled to both sides of the main valve body section, respectively, and the fluid pressure flow passage can be switched by displacement of the main shaft.

Particularly, in such a double solenoid type solenoid valve, two sets of a movable iron core and a fixed iron core are provided, for example, in response to the recent demands for wiring, simplification of assembly work and miniaturization of the outer shape. Improvements have been made in terms of work surface and external shape by incorporating the solenoid parts in parallel in the solenoid part and connecting this solenoid part to one side of the main valve body part.

[0004]

[Problems to be solved by the device]

 However, in the prior art as described above, for example, a nonmagnetic ring is used to form a gap between the lower iron core and the movable iron core. In such a case, the lower iron core and the solenoid coil are used. It is necessary to secure the axial center with the bobbin for use and to construct a minute gap, which is a problem that assembly is not easy and work efficiency is poor.

Further, a method of forming the end portion of the bobbin for the solenoid coil into a thin wall in order to obtain a minute gap may be considered, but it is difficult to apply due to difficulty in processing and processing accuracy. There is a problem called.

Therefore, even in such a partial configuration of the solenoid valve, it is desired to improve the efficiency of the assembling work in the details such as the component parts by simplifying the assembling accuracy and workability.

Therefore, an object of the present invention is to effectively reduce the minute gap between the lower iron core of the solenoid and the bobbin for the solenoid coil in a double solenoid type solenoid valve in which the solenoid is provided on one side of the main valve body. It is to provide a solenoid valve that can be well constructed.

The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

[0009]

[Means for Solving the Problems]

 Of the devices disclosed in the present application, the outline of a typical one will be briefly described as follows.

That is, the solenoid valve of the present invention comprises a solenoid portion and a main valve main body portion, two sets of movable iron cores and fixed iron cores are built in parallel in the solenoid portion, and this solenoid portion is the main valve main body portion. It is a solenoid valve that is connected only to one side, and the same circular groove is provided on the outer peripheral part of the opening in which the movable core is loosely inserted in the lower core that constitutes the magnetic path of the two movable cores and the fixed core. In addition, the flange of the solenoid coil bobbin with which the lower iron core is in contact has a protrusion with the same circumference that fits in the groove of the lower iron core, and the inner diameter of the hole in the lower iron core is set to the bobbin for the solenoid coil. It is slightly larger than the inner diameter of the shaft hole.

[0011]

According to the solenoid valve described above, the same circumferential groove portion is provided on the outer peripheral portion of the opening of the lower iron core, and the same circumferential convex portion is provided on the flange of the solenoid coil bobbin. Thus, the coaxiality can be obtained by fitting and assembling the groove portion of the lower iron core and the convex portion of the bobbin. As a result, the solenoid part can be easily assembled, and the assembling work of the solenoid valve can be simplified.

Moreover, the opening of the lower iron core is formed slightly larger than the inner diameter of the shaft hole of the bobbin for the solenoid coil, so that the minute gap between the lower iron core and the movable iron core can be efficiently formed. Can be configured. This simplifies the assembly of the solenoid part and makes the solenoid valve assembly work more efficient.

[0013]

【Example】

 FIG. 1 is a cross-sectional view showing a solenoid valve according to an embodiment of the present invention, and FIGS. 2 (a), (b), and (c) are front views and cross-sections showing in detail the solenoid portion of the solenoid valve of the present embodiment. Figures and rear views, Figures 3 (a) and 3 (b) are front and sectional views showing the lower iron core of the solenoid of the solenoid valve, and Figures 4 (a) and 4 (b) are the solenoid coil bobbins. It is a front view and a sectional view.

First, the configuration of the solenoid valve according to the present embodiment will be described with reference to FIG.

The solenoid valve of this embodiment is a double solenoid type solenoid valve in which, for example, two sets of movable iron cores and fixed iron cores are built in parallel in the solenoid part, and the solenoid part is coupled only to one side of the main valve body part. A main valve body 1 having a main shaft which is a valve and is housed so as to be displaceable in the axial direction; a solenoid part 2 which generates a pressing force for displacing the main shaft of the main valve main body 1; It is composed of a pilot valve body 3 that connects the valve body 1 and the solenoid portion 2, and has a structure in which the fluid pressure flow passage can be switched by a spool type indirect operation method.

The main valve body 1 has an input port 4, a first output port 5, a second output port 6, a first discharge port 7 and a second discharge port 8 for supplying / discharging fluid pressure on an outer peripheral portion thereof. Is opened, and these ports 4 to 8 are communicated with a shaft hole 9 that penetrates the inside of the main valve body 1 along the axial direction.

A spool (main shaft) 10 is housed in the shaft hole 9 of the main valve body 1 so as to be displaceable in the axial direction thereof, and a first piston 11 and a second piston 12 are fixed to both ends thereof. The first and second pistons 11 and 12 are housed in the first fluid chamber 13 and the second fluid chamber 14 in a displaceable manner.

Then, the first or second piston 11, 12 is pressed by the fluid pressure in the first or second fluid chamber 13, 14, and in conjunction therewith, the spool 10 moves to the right or left in FIG. By displacing in the direction, the flow path of the fluid pressure from the input port 4 can be switched.

As shown in FIG. 2, the solenoid portion 2 has two sets of a first solenoid 15 and a second solenoid 16 built therein in parallel, and a solenoid cover 18 whose outer end is closed by an end cover 17. It is resin-molded and stored inside.

The first solenoid 15 and the second solenoid 16 are provided with solenoid coils 19 and 20, respectively, and the center holes of these solenoid coils 19 and 20 have columns (fixed iron cores) on the outer end side. ) 21 and 22 are inserted.

Further, plungers (movable iron cores) 23 and 24 are housed in the center holes of the respective solenoid coils 19 and 20 so as to be displaceable along the axial direction, and are formed in the joint portion with the pilot valve main body portion 3. The springs retained in the recesses of the fluid chambers 25 and 26 are urged to the valve seats of the flow passages 27 communicating with the shaft holes 9.

The magnetic paths of the first and second solenoids 15 and 16 include an outer iron core 28 provided on the outer end side of the solenoid portion 2 and a lower iron core 29 provided on the main valve body 1 side. Columns 21 and 22 are fixed to the outer iron core 28, and plungers 23 and 24 are movably inserted in the lower iron core 29.

When the first solenoid 15 is in the non-excited state, the plunger 23 maintains the state of being displaced toward the main valve body 1 by the biasing force of the spring, and is brought into contact with the valve seat of the flow passage 27. ing. On the other hand, when the first solenoid 15 is excited, the plunger 23 is displaced toward the column 21 side by the electromagnetic force generated in the column 21 and the plunger 23, and the flow passage 27 is opened. Further, the same operation is performed in the second solenoid 16.

Further, the internal circuit of the solenoid portion 2 is formed by mounting a circuit component forming a circuit on one side of the flexible printed board 30, and is housed in the circuit chamber 31 of the solenoid cover 18. Further, the other side of the flexible printed board 30 is connected to an external connection terminal 32 which is connected to the outside.

The pilot valve main body 3 is provided with a manual pin 33 rotatably along the width direction thereof. Even when the first and second solenoids 15 and 16 are in a non-excited state, the manual pin 33 rotates. The spool 10 of the main valve body 1 is displaced in the same manner as the excited state of the first or second solenoid 15 or 16 by operation.

Further, a first fluid chamber 34 or a second fluid chamber 35 corresponding to the first solenoid 15 or the second solenoid 16 is formed at the connecting portion between the pilot valve body 3 and the main valve body 1, respectively. In the first and second fluid chambers 34 and 35, elastic flappers 36 and 37 are housed, and the flappers 36 and 37 made of an elastic body contact the valve seat of a flow passage 39 that communicates with a pilot discharge port 38 formed on the outer peripheral surface. It is touched.

Further, the first fluid chamber 34 of the pilot valve body 3 and the fluid chamber 25 of the first solenoid 15 and the second fluid chamber 35 of the pilot valve body 3 and the fluid chamber 26 of the second solenoid 16 are plural. Plunger pins 40 and 41, which are communicated with each other by the flow passages and are displaced in conjunction with the displacement of the plungers 23 and 24, are inserted therein.

When the first solenoid 15 is in the excited state, the flow passage 39 communicating with the pilot discharge port 38 is closed, while when the first solenoid 15 is in the non-excited state, the plunger pin 40 causes the flapper 36 to move. Is displaced and the flow passage 39 is opened, so that the fluid pressure is discharged from the pilot discharge port 38 to the outside. Also, the same operation is performed in the second solenoid 16.

In the solenoid valve configured as described above, the detailed structure of the solenoid portion 2, which is a feature of the present invention, will be described in detail with reference to FIGS. 3 and 4.

In the solenoid portion 2 of this embodiment, the lower iron core 29 and the solenoid are not used regardless of the conventional use of a non-magnetic ring and the assembly structure by thinning the bobbin ends of the solenoid coils 19 and 20. The combination of the coils 19 and 20 with the bobbin improves the assembling workability.

That is, as shown in FIG. 3, the lower iron core 29 constituting the magnetic paths of the first solenoid 15 and the second solenoid 16 is identical to the outer peripheral portions of the two holes 29a into which the plungers 23 and 24 are loosely inserted. As shown in FIG. 4, the groove 29b of the lower iron core 29 is fitted into the collar of the bobbin 19a (20a) of the solenoid coil 19, 20 to which the lower iron core 29 is provided. Convex portions 19b (20b) having the same circumferential shape are formed.

Further, in order to configure the gap between the lower iron core 29 and the plungers 23 and 24, the inner diameter dimension φ1 of the opening 29a of the lower iron core 29 of FIG. The shaft hole 19c (20c) is formed slightly larger than the inner diameter φ2.

Thereby, in the two sets of the first and second solenoids 15 and 16 of the solenoid part 2, the groove part 29b of the lower iron core 29 and the convex part 19b (20b) of the bobbin 19a (20a) are fitted together. The solenoid section 2 can be easily assembled by combining them to obtain coaxiality.

In addition, the minute gap between the lower iron core 29 and the plungers 23, 24 can be efficiently formed by the difference in inner diameter between the opening 29a of the lower iron core 29 and the shaft hole 19c (20c) of the bobbin 19a (20a). However, the solenoid part 2 can be easily assembled.

Next, regarding the operation of this embodiment, the operation of the solenoid valve will be described.

First, when the first solenoid 15 is energized from the state of FIG. 1, that is, the state in which both the first solenoid 15 and the second solenoid 16 are not energized, the column 21 and the plunger 23 in the first solenoid 15 are excited. An electromagnetic force is generated in the column, and the plunger 23 is displaced toward the column 21 by the magnetic attraction force generated by the electromagnetic force, and the flow passage 27 is opened.

On the other hand, in the second solenoid 16, the urging force of the spring locked by the plunger 24 maintains the state in which the plunger 24 is displaced toward the main valve main body 1 side and the valve seat of the flow passage 27 is retained. The flow path 27 is closed by the contact.

In this state, when a fluid such as air is supplied to the input port 4 from a fluid pressure source (not shown), the first solenoid 15 passes through the shaft hole 9 and the flow passage 27, and A fluid flows into the opened fluid chamber 25.

Furthermore, the fluid that has flowed into the fluid chamber 25 flows into the first fluid chamber 13 of the main valve body 1 via the first fluid chamber 34 of the pilot valve body 3 and Together, the first piston 11 is pressed and the spool 10 is displaced rightward in FIG.

On the other hand, in the second solenoid 16, the plunger pin 41 is brought into contact with one end side of the plunger 24, and the flapper 37 is maintained in a state of being displaced leftward against the elastic force, and is then fed to the pilot discharge port 38. The flow passage 39 is opened. As a result, the fluid in the second fluid chamber 14 of the main valve body 1 is discharged to the outside from the pilot discharge port 38 via the second fluid chamber 35 of the pilot valve body 3.

At the same time, the fluid supplied to the input port 4 is connected to the first output port 5 from the first output port 5 via the shaft hole 9 and is a driven system (not shown) that is a driven system or the like. Is supplied to. The fluid discharged from the fluid pressure actuated device is discharged from the second output port 6 through the shaft hole 9 to the outside through the second discharge port 8.

Contrary to the above, when the first solenoid 15 is in the non-excited state and the second solenoid 16 is in the excited state, the second solenoid 15 is excited in the same manner as when the first solenoid 15 is excited. 16, an electromagnetic force is generated in the column 22 and the plunger 24, and the plunger 24 is displaced to the column 22 side by the magnetic attraction force due to this electromagnetic force, so that the spool 10 of the main valve body 1 moves to the left in FIG. Is displaced.

In this state, the fluid supplied to the input port 4 is supplied to the fluid pressure operating device from the second output port 6 via the shaft hole 9 and further discharged from this fluid pressure operating device. Is discharged from the first output port 5 through the shaft hole 9 to the outside through the first discharge port 7.

Therefore, according to the solenoid valve of the present embodiment, particularly in the detailed structure of the solenoid portion 2 which is the feature of the present invention, the lower iron core 29 which is the magnetic path of the first solenoid 15 and the second solenoid 16 is provided. The groove 29b is provided, the bobbin 19a (20a) of the solenoid coil 19, 20 is provided with a protrusion 19b (20b) on the collar, and the lower iron core 29 has an opening 29a which is a shaft hole of the bobbin 19a (20a). By being formed slightly larger than the inner diameter of 19c (20c), the coaxiality between the lower iron core 29 and the bobbin 19a (20a) is secured, and the lower iron core 29 and the plungers 23, 24 are It is possible to efficiently construct a minute gap, which makes it possible to improve the efficiency of the assembly work of the solenoid valve.

Although the invention made by the present inventor has been specifically described based on the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say.

For example, the solenoid valve of the present embodiment has a shape formed by the groove portion 29b of the lower iron core 29 and the convex portion 19b (20b) of the bobbin 19a (20a) as shown in FIGS. However, the present invention is not limited to the above-described embodiment, and the present invention is not limited to the above-described embodiments, and can be widely applied as long as the lower iron core and the bobbin are in coaxial contact with each other. Applicable.

In the above description, the invention mainly made by the present inventor is applied to a double solenoid / spool type indirect actuation type solenoid valve, which is the field of use of the invention. However, the invention is not limited to this. Instead, it can be widely applied to other solenoid valves in which two sets of plungers and columns are built in parallel in the solenoid section.

Further, it goes without saying that the present invention can also be applied to a directional control valve, a control valve, etc. having such an electromagnetic valve structure with a solenoid portion.

[0049]

[Effect of device]

 The effects obtained by the representative one of the inventions disclosed in the present application will be briefly described as follows.

(1). The same circumferential groove is provided on the outer peripheral portion of the opening in which the movable core is loosely inserted in the lower core that constitutes the magnetic path of the two sets of the movable core and the fixed core. On the collar of the solenoid coil bobbin whose side cores are in contact with each other, provide a convex part with the same circumference that fits in the groove of the lower core. By making it slightly larger than the size, the groove of the lower iron core and the convex part of the bobbin can be fitted together to obtain coaxiality, so that the solenoid part can be easily assembled. it can.

(2) According to the above (1), since the opening of the lower iron core is formed slightly larger than the shaft hole of the solenoid coil bobbin, the small gap between the lower iron core and the movable iron core can be efficiently formed. It can be well configured and the solenoid part can be easily assembled.

(3) According to the above (1) and (2), the solenoid part in which two sets of movable iron core and fixed iron core are housed in parallel is a double solenoid in which only one side is connected to the main valve main body. In the solenoid valve of the type, it is possible to obtain the solenoid valve which can improve the efficiency of the assembling work by the combined structure of the lower iron core and the bobbin for the solenoid coil.

[Brief description of drawings]

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

2A, 2B, and 2C are a front view, a cross-sectional view, and a rear view showing in detail a solenoid portion of the solenoid valve according to the present embodiment.

3 (a) and 3 (b) are a front view and a cross-sectional view showing a lower iron core in the solenoid portion of the solenoid valve according to the present embodiment.

4 (a) and 4 (b) are a front view and a cross-sectional view showing a bobbin for a solenoid coil in a solenoid portion of a solenoid valve of this embodiment.

[Explanation of symbols]

 1 Main Valve Main Body 2 Solenoid Part 3 Pilot Valve Main Body 4 Input Port 5 First Output Port 6 Second Output Port 7 First Discharge Port 8 Second Discharge Port 9 Shaft Hole 10 Spool (Spindle) 11 First Piston 12th 2 piston 13 1st fluid chamber 14 2nd fluid chamber 15 1st solenoid 16 2nd solenoid 17 end cover 18 solenoid cover 19,20 solenoid coil 19a, 20a bobbin 19b, 20b convex part 19c, 20c shaft hole 21, 22 column ( Fixed iron core) 23,24 Plunger (movable iron core) 25,26 Fluid chamber 27 Flow passage 28 Outer iron core 29 Lower iron core 29a Opening 29b Groove 30 Flexible printed circuit board 31 Circuit room 32 External connection terminal 33 Manual pin 34 First fluid chamber 35 second fluid chamber 36, 37 flapper 38 pilot Discharge port 39 Flow path 40, 41 Plunger pin

Claims (1)

[Scope of utility model registration request] 1. A solenoid part and a main valve body part are provided,
A solenoid valve in which two sets of movable iron cores and fixed iron cores are built in parallel in the solenoid part, and the solenoid parts are coupled only to one side of the main valve body part, wherein the two sets of movable iron cores and fixed iron cores are provided. The same circular groove is formed on the outer peripheral portion of the opening into which the movable iron core is loosely inserted in the lower iron core forming the magnetic path, and the lower iron core is connected to the collar of the solenoid coil bobbin. It is characterized in that a convex portion having the same circumferential shape that fits into the groove portion of the side iron core is provided, and the inner diameter of the opening of the lower iron core is slightly larger than the inner diameter of the shaft hole of the solenoid coil bobbin. solenoid valve.