JPH0727249A - Pilot type solenoid valve - Google Patents

Abstract

PURPOSE:To make a main valve switching part compact in a single solenoid type pilot solenoid valve and allow constituent parts to be used in common for a double solenoid type solenoid valve. CONSTITUTION:In the case of a pressure supply passage 15 being communicated with one chamber R1 of a spool 10 by a first valve 23, a second valve 29 communicates the other chamber R2 of the spool 10 with a pilot pressure exhaust passage 7 In the case of cutting off communication between the pressure supply passage 15 and one chamber R1 of the spool 10 and communicating one chamber 1 with the pilot pressure exhaust passage 7, the second valve 29 communicates the other chamber R2 with the pressure supply passage 15. As a result, even in a single solenoid type pilot solenoid valve, the pressure receiving areas of pistons 11, 12 at both ends of the spool 10 can be made equal, and a pressure spring for energizing the spool 10 can be dispensed with.

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, the main valve switching unit 51, and the pilot valve unit 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.

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

In such a single solenoid type pilot type solenoid valve, when the solenoid portion 57 is not energized, the fluid supplied from the pressure supply passage 60 is discharged 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 the pistons 54 and 55. At this time, the spool 53
3 is located on the left side of FIG. 3, the diameter of the left piston 55 is made smaller than the diameter of the right piston 54 to change the pilot pressure receiving area.

When the solenoid portion 57 is energized, the pilot pressure applied to the right piston 54 disappears 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 become uncertain. Therefore, the piston 55 on the left side is provided with a pressing spring 63 that constantly urges the spool 53 to the right side.

Next, a double solenoid type solenoid valve will be described. As shown in FIG. 4, also in this solenoid valve, 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. Both solenoid valves 64 and 65 include 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 operation force of the solenoid portions 68 and 69. The flow direction of the fluid can be switched by being driven by. Further, when one solenoid portion 68 is energized, the other solenoid portion 69 is de-energized, and when one solenoid portion 68 is de-energized, the other solenoid portion 69 is energized. .

In such a double solenoid type pilot type solenoid valve, the fluid supplied from the pressure supply passage 60 is supplied as pilot pressure from one pilot pressure passage 60 to the chamber R1 when the solenoid 68 on the right side is not energized. 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 of FIG. 4 based on the differential pressure of R2.

When the right solenoid 68 is energized, the air in the chamber R1 communicating with 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 side position in FIG. 4 based on the differential pressure.

[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 of the single solenoid type shown in FIG. 3 and the double solenoid type shown in FIG. 4 are changed, the piston 55 is changed and the pressing spring 63 is used.
It is necessary to change 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.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to reduce the size of a main valve switching portion in a single solenoid type pilot solenoid valve, and further, to construct a double solenoid solenoid valve and its components. It is to try to standardize.

[0014]

In order to solve the above-mentioned problems, the present invention provides a main valve switching unit in which a spool for switching a flow path is movably arranged, and a switching operation is generated in the spool. In a pilot-type solenoid valve having a pilot valve portion, a pressure supply passage for supplying pilot pressure to a chamber formed at both ends of a spool, and a pilot pressure exhaust passage for exhausting the pilot pressure, the pilot valve portion includes: The solenoid portion is actuated based on the electromagnetic operation force of the solenoid portion, and the first position for connecting the pressure supply passage and one chamber of the spool with each other and the pressure supply passage and one chamber of the spool are disconnected from each other. A first valve that is switched between two positions, one of which is a second position for communicating the pilot pressure exhaust passage, and the first valve, which is operated in conjunction with the operation of the first valve. When moving 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 is that it is composed of a second valve that allows it.

[0015]

By adopting the above means, when the first valve moves to the first position where the pressure supply passage communicates with one chamber of the spool based on the electromagnetic operation force of the solenoid portion, the second valve moves. Interlocks with the first valve to connect the other chamber of the spool to the pilot pressure exhaust passage.

On the contrary, when the solenoid valve is moved to the second position that shuts off the pressure supply passage and one chamber of the spool and connects the one chamber and the pilot pressure exhaust passage, based on the electromagnetic operation force of the solenoid, 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 connected to the pilot pressure exhaust passage and the pilot pressure is not supplied. Therefore, it is not necessary to change the pressure receiving areas of the pistons at both ends of the spool or to incorporate springs in the main valve switching portion.

[0018]

【Example】

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

As shown in FIG. 1, the pilot solenoid valve 1 has a structure in which a port connecting portion 2, a main valve switching portion 3 and a pilot valve portion 4 are laminated in this order from the bottom. The three modules of the main valve switching unit 3 and the pilot valve unit 4 are connected so as to be disassembled.

An air supply passage 5 is formed in the center of the port connecting portion 2, a pair of cylinder ports 6 are formed on both left and right sides thereof, and a pair of exhaust passages 7 are formed on both left and right sides thereof. The air supplied from the air supply passage 5 is capable of supplying air to the cylinder port 6 and supplying 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 the 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 has a pilot valve section 4
And the chambers R1 and R2 are communicated with each other, and pilot pressure passages 13 and 14 for supplying pilot pressure to the chambers R1 and R2, and a pressure supply passage 15 for supplying pressure from the air supply passage 5 to the pilot valve portion 4 as pilot pressure Are formed respectively.

The pilot valve section 4 includes a solenoid section 1
6 and the valve unit 17. The solenoid portion 16 includes an electromagnetic coil 18, a core 19 and a plunger 20,
The plunger 20 is provided with a spring 21 for biasing 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.
Is provided. The first valve 23 is biased to the left 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.

A bypass passage 31 is formed in the valve portion 17 to connect the first valve hole 22 and 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, the pressure supply passage 15 and the pilot pressure passage 13 are communicated with each other, and the pilot pressure is supplied to the piston 11 in 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 is projected 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).

On the contrary, when the electromagnetic coil 18 is energized, the plunger 20 projects, the right exhaust passage 7 and the pilot pressure passage 13 are communicated with each other, and the air applied to 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 chambers R1 and R2 by energizing / de-energizing the electromagnetic coil 18, the other is exhaust passage 7 The pilot pressure is not supplied.

As a result, as in the conventional structure shown in FIG.
Since it is not necessary to change the pressure receiving areas of the pistons at both ends of the spool or to incorporate springs in the main valve switching section, it is possible to reduce the size of the main valve switching section and thus the solenoid valve as a whole.

As shown in FIGS. 1 and 4, the specifications of the single solenoid type and the double solenoid type are changed without changing the configurations 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 in the first embodiment and components having the same functions as those in the first embodiment are designated 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 portion 42, the main valve switching portion 43, the manifold block 44, and the pilot valve portion 4 are connected in a disassembleable manner.

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 an air pressure supply passage 49, which communicate with each other, are perforated.

The second embodiment constructed as described above is different from the first embodiment in the passages 15 and 47 for supplying and exhausting pilot pressure and the joints 45 and 4 forming 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, also in the second embodiment, it is possible to obtain basically the same effect as that of the first embodiment.

The present invention is not limited to the above-mentioned both 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
As the connection structure of 2, 43, 44, any connection structure such as screwing or tightening with a fixing band can be adopted. 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 section can be downsized, and the double solenoid type solenoid valve can be shared in its constituent parts, which is an excellent effect.

[Brief description of 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 a solenoid valve embodying the present invention.

FIG. 3 is a cross-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 reference numerals] 3,43 ... Main valve switching portion, 4 ... Pilot valve portion, 10 ... Spool, 15 ... Pressure supply passage, 7, 47 ... Pilot pressure exhaust passage, 16 ... Solenoid portion, 23 ... First valve (First
Valve), 29 ... second valve (second valve), R1, R2 ... chamber.

Claims (1)

[Claims] 1. A spool (10) for switching a flow path.
Of the main valve switching section (3, 43) movably arranged, a pilot valve section (4) for causing the spool (10) to perform a switching operation, and chambers () formed at both ends of the spool (10). A pilot type solenoid valve comprising 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, wherein the pilot valve portion (4) A first position that is operated based on the electromagnetic operation force of the solenoid part (16) and connects the pressure supply passage (15) and one chamber (R1) of the spool (10). And a second position for blocking the pressure supply passage (15) from one chamber (R1) of the spool (10) and communicating the one chamber (R1) with the pilot pressure exhaust passage (7, 47). Between the two positions The first valve (23) that is moved in exchange, and the spool (10) that is operated in conjunction with the operation of the first valve (23) and moves when the first valve (23) moves to the first position. Of the other chamber (R2) and the pilot pressure exhaust passage (7, 47) are communicated with each other, and when the first valve (23) moves to the second position, the other chamber (R2) and the pressure supply passage A pilot type solenoid valve comprising a second valve (29) communicating with (15).