JP2667780B2 - Pilot operated solenoid valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pilot type solenoid valve.

[0002]

2. Description of the Related Art Conventionally, as this type of pilot type solenoid valve, a single solenoid type solenoid valve using one solenoid in a pilot valve portion and a double solenoid type solenoid valve using two solenoids are known. ing.

That is, as shown in FIG. 3, the single solenoid type pilot type solenoid valve has a port connecting portion 5
0, a main valve switching section 51 and a pilot valve section 52 are sequentially connected. A spool 53 is accommodated in the housing of the main valve switching portion 51 so as to be switchable between two positions, and chambers R1 and R2 are formed at positions corresponding to both ends of the spool 53. In the chambers R1 and R2, a pair of pistons 54 and 55 are slidably arranged so as to press both ends of the spool 53.

The pilot valve section 52 houses a three-way solenoid valve 56. The solenoid valve 56 includes a solenoid part 57 and a valve part 58, and a valve 59 incorporated in the valve part 58 is driven based on the electromagnetic operation force of the solenoid part 57, thereby switching the flow direction of the fluid. It is designed to be used.

[0005] In such a single solenoid type pilot solenoid valve, when the solenoid 57 is not energized, the fluid supplied from the pressure supply passage 60 flows from one pilot pressure passage 61 and the other pilot pressure passage 62. A pilot pressure is supplied to each of the chambers R1 and R2. Therefore, the same pilot pressure is supplied to both the pistons 54 and 55. At this time, the spool 53
3, the diameter of the left piston 55 is made smaller than the diameter of the right piston 54, and the pressure receiving area of the pilot pressure is changed.

Further, when the solenoid 57 is energized, the pilot pressure applied to the right piston 54 is eliminated and the pilot pressure is applied only to the left piston 55, but the pressure receiving area of the left piston 55 is reduced. The operation of the spool 53 to the right may be uncertain. Therefore, a pressing spring 63 that constantly urges the spool 53 to the right is interposed in the left piston 55.

Next, a double solenoid type solenoid valve will be described. As shown in FIG. 4, this solenoid valve also has a structure in which a port connecting portion 50, a main valve switching portion 51, and a pilot valve portion 52 are sequentially connected. Has become.

The pilot valve portion 52 accommodates a double solenoid four-way valve provided with two three-way type solenoid valves 64 and 65. Each of the solenoid valves 64 and 65 has valve portions 66 and 67 and solenoid portions 68 and 69, respectively, and valves 70 and 71 incorporated in the valve portions 66 and 67 are based on the electromagnetic operating force of the solenoid portions 68 and 69. When driven, the flow direction of the fluid is switched. When one solenoid 68 is energized, the other solenoid 69 is de-energized, and when one solenoid 68 is de-energized, the other solenoid 69 is energized. .

In such a double solenoid type pilot solenoid valve, when the right solenoid 68 is not energized, the fluid supplied from the pressure supply passage 60 is supplied from one pilot pressure passage 60 to the chamber R1 as pilot pressure. To be done. On the contrary, since the air in the chamber R2 communicating with the other pilot pressure passage 61 is exhausted, both chambers R1,
The spool 53 is located on the left side in FIG. 4 based on the differential pressure of R2.

When the right solenoid portion 68 is energized, the air in the chamber R1 connected to the pilot pressure passage 60 is exhausted, and the pilot pressure is supplied only to the chamber R2 via the pilot pressure passage 61. Both rooms R1 and R2
The spool 53 is switched to the right position in FIG.

[0011]

However, in the above-mentioned conventional single solenoid type pilot type solenoid valve,
As described above, the pistons 54, 5 at both ends of the spool 53
In order to generate a differential pressure at 5, the pressure receiving area between the right-side piston 54 and the left-side piston 55 is greatly changed, and the pressing spring 63 is incorporated. Therefore, the main valve switching unit 51 and the pilot type solenoid valve as a whole are adversely affected in size reduction.

When the specifications are changed between the single solenoid type shown in FIG. 3 and the double solenoid type shown in FIG.
It is necessary to make a change such as detachment of the housing and change of the diameter of the chamber R2 in the housing. Therefore, it has been a hindrance to the commonization of parts between the single solenoid type and the double solenoid type.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to reduce the size of the main valve switching portion in a single solenoid type pilot solenoid valve, and to provide a double solenoid type solenoid valve and components. It is to try to standardize.

[0014]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a main valve switching section in which a spool for switching a flow path is movably disposed, and a switching operation is performed on the spool. A pilot valve portion, a pressure supply passage for supplying pilot pressure to a chamber formed at both ends of the spool, and a pilot-type solenoid valve including a pilot pressure exhaust passage for exhausting the pilot pressure, wherein the pilot valve portion is The solenoid portion is operated based on the electromagnetic operation force of the solenoid portion, and the pressure supply passage and one chamber of the spool are communicated with each other; A first valve for switching between one of two chambers and a second position for communicating the pilot pressure exhaust passage, and a first valve operated in conjunction with the operation of the first valve; When it moves to the first position, the other chamber of the spool communicates with the pilot pressure exhaust passage, and when the first valve moves to the second position, the other chamber communicates with the pressure supply air passage. The gist of the present invention is that it is constituted by a second valve to be operated.

[0015]

When the first valve is moved to the first position for communicating the pressure supply passage with one of the chambers of the spool based on the electromagnetic operation force of the solenoid portion, the second valve is used. Interlocks with the first valve to connect the other chamber of the spool to the pilot pressure exhaust passage.

On the contrary, when the pressure supply passage and one of the chambers of the spool are shut off and moved to the second position where the one chamber communicates with the pilot pressure exhaust passage based on the electromagnetic operating force of the solenoid portion, The second valve works in conjunction with the first valve to establish communication between the other chamber and the pressure supply air passage.

Therefore, when the pilot pressure is supplied to one of the two chambers due to the energization / de-energization of the solenoid portion, the other is communicated with the pilot pressure exhaust passage and the pilot pressure is not supplied. Therefore, in the main valve switching portion, it is not necessary to change the pressure receiving area of the piston at both ends of the spool or to incorporate a spring.

[0018]

【Example】

[First Embodiment] A first embodiment of the present invention will now be described with reference to FIG.

As shown in FIG. 1, the pilot type solenoid valve 1 has a structure in which a port connection part 2, a main valve switching part 3, and a pilot valve part 4 are laminated in this order from below. The three modules of the main valve switching section 3 and the pilot valve section 4 are respectively connected so as to be disassembled.

The port connection portion 2 has an air supply passage 5 formed at the center thereof, a pair of cylinder ports 6 on the left and right sides thereof, and a pair of exhaust passages 7 on the left and right sides thereof. The air supplied from the air supply passage 5 can supply air to the cylinder port 6 and supply air to the pilot valve portion 6.

A spool hole 9 extending in the left-right direction is formed in the housing 8 of the main valve switching portion 3, and the air supply passage 5, the cylinder port 6, and the exhaust passage 7 are connected to the spool hole 9. . A spool 10 is accommodated in the spool hole 9 so as to be switchable between two positions, and chambers R1 and R2 are formed at positions corresponding to both left and right ends of the spool 10. A pair of pistons 1 are provided in the chambers R1 and R2.
1, 12 are slidably arranged so as to press both ends of the spool 10. Both pistons 1
The diameters 1 and 12, that is, the pressure receiving areas are formed to be equal.

The main valve switching section 3 includes a pilot valve section 4
Pressure passages 13, 14 for communicating pilot pressure to the chambers R 1, R 2 by making the chambers communicate with the chambers R 1, R 2, and a pressure supply passage 15 for supplying a pressure that becomes pilot pressure from the air supply passage 5 to the pilot valve portion 4. Are formed respectively.

The pilot valve section 4 includes a solenoid section 1
6 and the valve unit 17. The solenoid unit 16 includes an electromagnetic coil 18, a core 19, and a plunger 20,
The plunger 20 is provided with a spring 21 for urging the plunger 20 to the left in the drawing. A first valve hole 22 is formed in the valve portion 17, and a first valve 23 is formed in the first valve hole 22.
Are arranged. The first valve 23 is urged leftward by a spring 24. A valve guide 25 is interposed between the first valve 23 and the plunger 20, and the first valve 23 and the plunger 20 are always in contact with the valve guide 25 by the urging force of the springs 21 and 24.

A diaphragm 26 is fixed to the left end of the valve portion 17, and a rod 27 is fixed to the right side surface of the diaphragm 26. A second valve hole 28 is formed on the left side of the first valve hole 22 of the valve portion 17, and a second valve 29 is arranged in the second valve hole 28. And this second valve 29
Is fixed to the tip of the rod 27. A return spring 30 is interposed in the diaphragm 26.

The valve section 17 is formed with a bypass passage 31 for communicating the first valve hole 22 with the diaphragm 26. A wiring electric circuit portion 32 accommodating an electric circuit and wiring (not shown) for controlling the operation of the solenoid is attached to the upper portion of the pilot valve portion 4.

When the electromagnetic coil 18 is not energized, the plunger 20 is retracted, and the pressure supply passage 15 and the pilot pressure passage 13 communicate with each other to supply pilot pressure to the piston 11 of the chamber R1. Further, the pressure supply passage 15 and the bypass passage 31 are communicated with each other, the diaphragm 26 is deformed, and the rod 27 projects rightward. Since the exhaust passage 7 on the left side and the chamber R2 are communicated with each other through the space around the rod 27, the second valve hole 28, and the pilot pressure passage 14,
The air in the chamber R2 is exhausted. As a result, the spool 10
Is moved to the left (state of FIG. 1).

Conversely, when the electromagnetic coil 18 is energized, the plunger 20 protrudes, the right exhaust passage 7 and the pilot pressure passage 13 communicate with each other, and the air acting on the piston 11 of the chamber R1 is exhausted. The pilot pressure applied to the chamber R1 disappears. Further, the exhaust passage 7 on the right side and the bypass passage 31 are communicated with each other, and the diaphragm 26 returns to a flat plate shape based on the biasing force of the return spring 30. Further, since the pressure supply passage 15 and the chamber R2 communicate with each other through the second valve hole 28 and the pilot pressure passage 14, the pilot pressure is supplied to the chamber R2. As a result, the spool 10 is moved to the right.

As described above, according to the present embodiment, when the pilot pressure is supplied to one of the two chambers R1 and R2 due to the energization / de-energization of the electromagnetic coil 18, the other is set to the exhaust passage 7 The pilot pressure is not supplied.

As a result, as in the conventional structure shown in FIG.
In the main valve switching section, it is not necessary to change the pressure receiving areas of the pistons at both ends of the spool and to incorporate a spring. Therefore, it is possible to reduce the size of the main valve switching section, and hence the overall solenoid valve.

As shown in FIGS. 1 and 4, the specifications of the single solenoid type and the double solenoid type can be changed without changing the configuration of the port connecting portion 2 and the main valve switching portion 3. be able to. Therefore, it is possible to promote the common use of the components, facilitate the specification change, and reduce the cost.

[Second Embodiment] Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, the same components as those of the first embodiment and the components having the same functions are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 2, the pilot type solenoid valve 41 of this embodiment includes a port connecting portion 42, a main valve switching portion 43,
It is composed of a manifold block 44 and a pilot valve section 4, and the manifold block 4 is provided on both sides of the main valve switching section 43.
4 and the port connecting portion 42 are arranged to face each other. The four modules of the port connection part 42, the main valve switching part 43, the manifold block 44, and the pilot valve part 4 are connected so as to be disassembled, respectively.

The port connecting portion 42 has a first and a second.
The joints 45 and 46 that form the cylinder port are vertically embedded in parallel, and the joints 45 and 46 are communicated with the main valve switching portion 43.

Inside the manifold block 44, the pilot valve portion 4 and the chambers R1 and R2 are communicated with each other, and the chamber R
Pilot pressure passage 1 for supplying pilot pressure to R1 and R2
3 and 14, a pressure supply passage 15 for supplying a pilot pressure to the pilot valve portion 4, and a pilot pressure exhaust passage 47 for exhausting pilot pressure are formed. In addition, the manifold block 44 has a spool hole 9
An exhaust passage 48 and a pneumatic supply passage 49 communicating with the air passage are respectively formed by drilling.

The second embodiment constructed as described above is different from the first embodiment in that the passages 15, 47 for supplying and exhausting the pilot pressure and the joints 45, 4 constituting the cylinder ports.
The only difference is that the passages 48 and 49 for supplying and exhausting air to the 6 side are provided from different ports, and that the manifold block 44 is interposed. Therefore, in the second embodiment, basically, the same operation and effect as in the first embodiment can be obtained.

It should be noted that the present invention is not limited to only the above-mentioned embodiments, but can be carried out as follows without departing from the spirit of the present invention. (1) In the second embodiment, the pilot pressure exhaust passage 47
And the exhaust passage 48 may communicate with each other.

(2) Each of the modules 2, 3, 4, 4
The connection structure of 2, 43, 44 can employ any connection structure such as screwing or fastening with a fixing band. Further, the port connecting portions 2 and 42, the main valve switching portions 3 and 43, and the manifold block 44 may be fixed, respectively, and only the pilot valve portion 4 may be removable.

[0038]

As described in detail above, according to the present invention,
In the single solenoid type pilot type solenoid valve, the main valve switching portion can be reduced in size, and moreover, an excellent effect can be achieved in that the components can be shared with the double solenoid type solenoid valve.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a solenoid valve embodying the present invention.

FIG. 2 is a sectional view showing a second embodiment of the solenoid valve embodying the present invention.

FIG. 3 is a sectional view of a conventional single solenoid type solenoid valve.

FIG. 4 is a cross-sectional view of a conventional double solenoid type solenoid valve.

[Explanation of symbols]

3, 43 ... main valve switching section, 4 ... pilot valve section, 10 ... spool, 15 ... pressure supply passage, 7, 47 ... pilot pressure exhaust passage, 16 ... solenoid section, 23 ... first valve (first
Valves), 29: second valve (second valve), R1, R2: chamber.

Claims (1)

(57) [Claims] 1. A spool (10) for switching a flow path.
Are movably disposed, a main valve switching portion (3, 43), a pilot valve portion (4) for causing the spool (10) to perform a switching operation, and a chamber () formed at both ends of the spool (10). A pilot supply solenoid valve provided with a pressure supply passage (15) for supplying a pilot pressure to R1, R2) and a pilot pressure exhaust passage (7, 47) for exhausting the pilot pressure; A first position which is operated based on the electromagnetic operation force of the solenoid part (16) and which connects the pressure supply passage (15) and one chamber (R1) of the spool (10). And a second position for shutting off the pressure supply passage (15) and one chamber (R1) of the spool (10) and for communicating the one chamber (R1) with the pilot pressure exhaust passage (7, 47). Between the two positions A first valve (23) that moves in the opposite direction, and is operated in conjunction with the operation of the first valve (23). When the first valve (23) moves to the first position, the spool (10) The other chamber (R2) communicates with the pilot pressure exhaust passage (7, 47), and when the first valve (23) moves to the second position, the other chamber (R2) communicates with the pressure supply passage. And (15) a second valve (29) for communicating with the pilot solenoid valve.