WO2003104696A1

WO2003104696A1 - Solenoid valve

Info

Publication number: WO2003104696A1
Application number: PCT/JP2003/006664
Authority: WO
Inventors: 橋本　岳
Original assignee: 株式会社コガネイ
Priority date: 2002-06-06
Filing date: 2003-05-28
Publication date: 2003-12-18
Also published as: CN1659396A; TWI223041B; JP2004011736A; JP3853700B2; CN100363671C; TW200404971A

Abstract

A main valve stem (17) is provided reciprocaingly in the axial direction in a containing hole formed in a valve casing (20) and an output port is interconnected with an air supply port or an exhaust port by being switched by means of the main valve stem (17). A movable core (36) is reciprocated in the axial direction by conducting a coil at a solenoid section (32), and a pilot valve interlocked with the movable core (36) interconnects an output passage communicating with a pneumatic chamber (29) and an air supply passage (39) communicating with the air supply port or an exhaust passage (42) by switching. The valve casing (20) is provided with a manual button (51) for operating the movable core (36) manually and a stopper (57) movable freely between an engaging position and a retreating position is provided in order to regulate pushing in of the manual button (51). When the stopper (57) is set at the engaging position, operation of the manual button (51) is prohibited.

Description

Specification

Solenoid valve technical field

The present invention relates to a solenoid valve operated by a solenoid, and is particularly useful when applied to a pilot operated type in which a main valve shaft is operated by a pilot pressure generated by a direct acting solenoid valve. Related to various solenoid valves. :

Directional control valves that control the direction of air flow control the supply and stop of air pressure to the pneumatic circuit, control the supply and discharge of air pressure, and switch the direction of air pressure supply for reciprocating cylinders, etc. It has two or more ports, and there are two-position valves with two valve switching states and three-position valves with three valve switching states. As such a directional control valve, a direct-acting 3-port solenoid valve operated by an electromagnet, that is, a movable iron core of a solenoid, that is, a pilot valve, supplies or stops supply of pipe pressure to the main valve shaft. Thus, there is a pilot-operated indirectly operated solenoid valve in which the main valve shaft is switched by this pilot pressure. This indirect-acting solenoid valve has the advantage that the main valve shaft, whose operating force is large, can be switched by the pilot pressure. A single solenoid type solenoid valve, which operates the main valve shaft with one electromagnet, and two There is a double solenoid type that operates the main valve shaft with an electromagnet. With a single solenoid type two-position valve, the main valve shaft returns to its original position when the electromagnet is de-energized. On the other hand, in the double solenoid type two-position valve, the main valve shaft maintains the original position if the power is not supplied to one of the magnets and the other is not supplied. Furthermore, in the double solenoid type three-position valve, when energization of both electromagnets is released, the main valve shaft becomes the neutral position, and when one of the electromagnets is energized, the main valve shaft operates similarly to the two-position valve.

On the other hand, since the pilot valve described above is a direct acting 3-port valve, it can be used as a single solenoid valve.

Both single solenoid type and double solenoid type are used alone In some cases, a plurality of solenoid valves are assembled and mounted on a bracket or block and used. The assembled type is called a manifold solenoid valve. The solenoid valve will not operate unless the coil of the solenoid is energized, regardless of whether it is used alone or of the manifold type. Does not work.

Therefore, in order to be able to forcibly operate the solenoid valve in a state where power is not connected to the coil, the pilot valve is forcibly activated by energizing the coil, that is, the movable iron core is forcibly operated by a manual button. It works so that it works. Conventionally, a manual button is assembled to the valve casing by protruding outside the valve casing, and when the manual button is pushed in, the movable iron core forcibly drives the pilot valve. If the manual button is pushed by mistake, the solenoid valve will be inadvertently activated. Similarly, when the pilot valve is used as a single unit and used as a direct acting 3-port solenoid valve, a manual button may be incorporated in the same manner.

An object of the present invention is to provide an electromagnetic valve that can prevent a malfunction of a manual button. Disclosure of the invention

The present invention provides a valve casing having a receiving hole communicating with an air supply port, an output port, and an exhaust port, the valve casing being provided in the receiving hole so as to be reciprocally movable in an axial direction, and providing the output port with the air supply port. A main valve shaft for switching and communicating with a port and the exhaust port, a solenoid portion provided with a movable core mounted on the valve casing and reciprocating in the axial direction by energizing a coil, and the movable core A pilot valve attached to the valve casing in conjunction with the valve and switching an output passage communicating with an air pressure chamber accommodating the piston to an air supply passage and an exhaust passage communicating with the air supply port to communicate therewith; A hand that is reciprocally mounted on the valve casing and that moves the pilot port valve to a position that allows the output passage and the air supply passage to communicate with each other by a pushing operation; A moving button, and a stopper that is mounted on the valve casing so as to be engageable with the manual button, and that controls the pushing movement of the manual button. Is a solenoid valve.

The present invention is characterized in that pistons are provided at both ends of the main valve shaft, and two pilot valves respectively operated by the solenoid portions are provided corresponding to two pneumatic chambers accommodating the respective pistons. Solenoid valve. Further, the present invention is the electromagnetic valve, wherein the main valve shaft moves to two or three positions.

According to the present invention, the pilot valve for driving the main valve shaft is operated to the position where the output flow path and the air supply flow path are communicated by operating the manual button, while the pushing movement of the manual button is regulated by the stopper. As a result, erroneous operation of the manual button is prevented by the stopper.

The present invention provides an air supply passage having an open end formed in a first valve seat, and an exhaust passage having an open end formed in a second valve seat which is opposite to the first valve seat. A valve casing formed with a passage and an output passage for guiding air flowing out of the air supply passage to an output portion; and a movable iron core attached to the valve casing and reciprocating in an axial direction by energizing a coil. A solenoid, a switching valve provided on the movable core for opening and closing the first valve seat, and disposed in the valve casing so as to face the closing valve, and driven by the movable core via an interlocking pin. And a flapper valve that opens and closes the second valve seat, and is reciprocally mounted on the valve casing, and operates the open / close valve to a position that connects the output passage and the air supply passage by a pushing operation. Manual button And a stopper attached to the knurl casing so as to be freely engageable with the manual button and for restricting the manual button from being pushed.

In the present invention, the on-off valve is operated to the position where the output flow path and the air supply flow path are communicated by operating the manual button, while the pushing movement of the manual button is regulated by the stopper. Is prevented from being erroneously operated. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a perspective view showing a solenoid valve according to an embodiment of the present invention when the present invention is applied to a manifold type, FIG. 2 is a cross-sectional view showing an enlarged part of FIG. 1, and FIG. Fig. 4 (A) is a cross-sectional view showing an enlarged part of Fig. 2. FIG. 4 (B) is a plan view showing the manual button and the stopper rotated after being pushed in, and FIG. 4 (C) is a view showing the stopper in the engaged position. FIG. 5 is a plan view showing a manual button and a stopper in a folded state, and FIG. 5 is a cross-sectional view showing a solenoid valve according to another embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The manifold type solenoid valve shown in Fig. 1 has four solenoid valves 11 attached to the manifold block 10 facing the width direction, and Fig. 2 attaches to the manifold block 10 One of the four solenoid valves shown is shown. The manifold block 10 is formed with an air supply channel 12 connected to an air pressure source and two exhaust channels 13 and 14 extending in the longitudinal direction, respectively. Although four solenoid valves 11 are mounted on the manifold block 10 in FIG. 1, any number of solenoid valves 11 can be mounted on the manifold block 10.

As shown in FIG. 2, the solenoid valve 11 has a main valve block 15 having a substantially rectangular parallelepiped shape, and a main valve shaft 17 is formed in an accommodation hole 16 formed in the main valve block 15 in the axial direction. It is housed in a freely reciprocating manner. A cover block 18 is fixed to one end of the main valve block 15, and a pilot block 19 is fixed to the other end. These main valve block 15, cover block 18 and pilot block 19 are fixed. Thus, valve casing 20 is formed.

An air supply port 21 is formed in the main valve block 15 to communicate the air supply passage 12 with the accommodation hole 16, and the two exhaust passages 13, 14 and the accommodation hole 16 communicate with each other. Two exhaust ports 22 and 23 are formed. In the main valve block 15, an output port 24 is formed at an intermediate position between the air supply port 21 and one exhaust port 22, and the air supply port 21 and the other exhaust port 23 are formed. An output port 25 is formed at an intermediate position between the two.

As described above, when the output ports 24 and 25 are formed in the main valve block 15, a joint that supplies compressed air to pneumatically operated devices such as a pneumatic cylinder is attached to the main valve block 15. Will be. However, the manifold block 10 When a plurality of solenoid valves 11 are installed, the output ports 24 and 25 are provided in the manifold block 10 so as to correspond to the respective solenoid valves 11 so as to communicate with the receiving holes 16. May be.

The main valve shaft 17 is provided with a plurality of valve elements 17a, and when the main valve shaft 1 移動 moves to the first position at the negative end, as shown in FIG. And the output port 25 are in communication, and the output port 24 and the exhaust port 22 are in communication. On the other hand, when the main valve shaft 17 moves to the second position at the other end, the port is switched, and the air supply port 21 and the output port 24 are connected. The communication state is established, and the output port 25 and the exhaust port 23 are communicated.

A piston 26 is disposed at one end of the main valve shaft 17, and a piston 27 having a larger diameter than the piston 26 is disposed at the other end. A pneumatic chamber 28 is formed by the cover work 18 and the main valve work 15 so as to slidably guide the piston 26 in the axial direction, and the piston work 19 and the main valve work 15 form a piston chamber 2. A pneumatic chamber 29 is formed to guide 7 slidably in the axial direction.

The air supply port 2 1 is connected to the pneumatic chamber by the air supply passage 3 1 formed in the main valve block 15.

If compressed air is supplied to the air supply port 21, compressed air is always supplied to the pneumatic chamber 28, and the main valve shaft 17 is in the first position. A going thrust will be added. However, if a compression coil spring is incorporated in the pneumatic chamber 28 and this is used as the spring accommodating chamber, thrust in the same direction can be applied by the compression coil spring.

The solenoid block 32 is attached to the pilot block 19, and as shown in FIG. 1, the solenoid section 32 has a bobbin 34 around which a coil 33 is wound. A fixed iron core 35 is mounted in 34, and a plunger, that is, a movable iron core 36 is mounted so as to freely move back and forth in the axial direction. As shown in FIG. 3, a rubber on-off valve 37 is attached to the tip of the movable iron core 36, and this on-off valve

Reference numeral 37 denotes a first valve seat 38 formed on the pilot block 19 so as to come into contact therewith. The valve seat 38 has an opening of an air supply passage 39 formed in the main valve block 15 and the pilot block 19 so as to communicate with the air supply port 21. It is opened and closed by the on-off valve 37. On / off valve 3 7 is provided for movable iron core 3 6 A compression coil spring 40 that applies a spring force toward the seat 38 is attached. Accordingly, when the coil 33 is energized, the movable iron core 36 moves in a stake toward the fixed iron core 35 with a spring force, and the opening of the air supply passage 39 is opened. The opening of the air supply passage 39 is closed by the spring force.

On the opposite side of the valve seat 38, a second valve seat 41 is formed in a direction opposite to the valve seat 38, and this valve seat 41 communicates with the outside of the pilot block 19. An opening of the exhaust passage 42 is provided. A cylindrical valve holder 43 is attached to the pie port protector 19 so as to cover the valve seat 41, and a flapper valve 44 is incorporated in the valve holder 43 so as to be freely opened and closed. The flapper valve 44 opens and closes the opening of the exhaust passage 42. A plurality of interlocking pins 45 are arranged between the flapper valve 44 and the movable iron core 36, and the flapper valve 44 is opened and closed by the movable iron core 36 via the interlocking pin 45.

A through hole 46 is formed in the valve holder 43, and as shown in Fig. 2, when the coil 33 is de-energized, the armature 36 is pressed against the valve seat 38 by spring force. As a result, the on-off valve 37 comes into contact with the valve seat 38, and the flapper valve 44 is separated from the valve seat 41. As a result, the pneumatic chamber 29 is communicated with the outside via the exhaust passage 42, the air in the pneumatic chamber 29 is discharged to the outside, and the main valve shaft 17 is supplied into the air ffi chamber 28. Due to the air pressure present, it will be in the first position as shown in FIG. On the other hand, when the coil 33 is energized, the on-off valve 37 is separated from the valve seat 38 and the flapper valve 44 is provided with the coil spring 47 incorporated in the valve holder 43 so that the valve seat 4 is closed. Since the spring force toward 1 is applied, the compressed air supplied from the air supply port 21 through the air supply passage 39 flows from the gap between the interlocking pin 45 and the hole through which it passes. The air flows into the pneumatic chamber 29 which is the output section through the output passage. Although the compressed air supplied to both pneumatic chambers 28 and 29 has the same pressure, the pressure receiving area of piston 27 is set to be larger than the pressure receiving area of piston 26, so that frano valve 44 opens. When the air is supplied into the air pressure chamber 29, the main valve shaft 17 is driven to the left stroke end position in FIG. 1, that is, the second position. As described above, the on-off valve 37 and the flapper valve 44 constitute a pilot valve that switches the output passage communicating with the pneumatic chamber 29 to the supply passage 39 and the exhaust passage 42 to communicate with each other. A mounting hole 48 is formed at a predetermined depth from the connection end face with the main valve pro- cess 15 in the pie mouth port work 19, and a fill filter 49 is formed in the mounting hole 48 so as to traverse the exhaust passage 42. It is cut and attached. The filter 49 is made of cloth, porous resin, etc. and has a large number of pores, allowing air from inside the pneumatic chamber 29 to be exhausted to the outside, and foreign matter such as dust from the outside. Exhaust passages 42 are prevented from entering. As shown in FIG. 3, the pilot block 19 constituting the valve casing 20 is provided with a manual button 51 which can reciprocate in a direction perpendicular to the reciprocating direction of the movable iron core 36. The manual button 51 has a large-diameter proximal end 51 a and a small-diameter distal end 5 lb. The proximal end 51 a protrudes outside the pilot block 19 and has a movable core 3 at the distal end. An inclined surface 52 contacting 6 is formed.

An operation lever 53 extending in a direction perpendicular to the base end 51a is provided on the base end 51a. By operating the operation lever 53, the operator can turn the manual button 51. Can be. In order to guide the reciprocating motion and the pivoting motion of the manual button 51 in the axial direction, an engaging groove 55 engaging with the engaging pin 54 fixed to the pilot block 19 is formed on the base of the manual button 51. The end 51a is formed. The engagement groove 55 engages with the engagement pin 54 when the manual button 51 is moved in the axial direction.The engagement groove 54 engages with the engagement bin 54 when the manual button 51 is rotated. 5b. '' A compression coil spring 56 is installed outside the small-diameter portion of the manual button 51 to apply a spring force in the direction that causes the manual button 51 to protrude outward. Under the state of engagement with 55a, unless a pushing force is applied to the manual button 51, the manual button 51 projects outward as shown in FIG. At this time, the inclined surface 52 of the manual button 51 is separated from the movable iron core 36, and the on-off valve 37 is separated from the valve seat 38. On the other hand, when the operator pushes the manual button 51, the inclined surface 52 of the manual button 51 comes into contact with the movable iron core 36 as shown in FIG. It will be piled at a spring force of 0 and will be separated from the valve seat 38.

4 (A) to 4 (C) are plan views of FIG. 3 respectively, and FIG. 4 (A) shows a state in which the manual button 51 is depressed as shown in FIG. 2 or FIG. It shows a state that it protrudes outward. As shown in Fig. 3, the manual button 51 is also depressed. When the operation lever 53 is operated to rotate the manual button 51, the engaging pin 54 engages with the circumferential groove 55b of the engaging groove 55, and the manual Even if a spring force in the protruding direction is applied to the button 51 by the coil spring 56, the manual button 51 remains pressed. FIG. 4B shows a state in which the manual button 51 is turned after being pressed.

A pilot 57 is mounted on the pilot block 19 so as to be able to reciprocate in a direction perpendicular to the direction of movement of the manual button 51 in order to restrict the pushing movement of the manual button 51. This stop horn 57 is provided with a stopper surface 59 associated with a step portion 58 provided on the manual button 51, and as shown in FIG. When moved, the stopper surface 59 and the stepped portion 58 face each other, and the movement of the manual button 51 is restricted even if the manual button 51 is pressed. This prevents the manual button 51 from being pushed by an erroneous operation.

When the stopper 57 is moved from the retracted position shown in FIGS. 4 (A) and (B) to the engagement position shown in FIG. 4 (C), the stopper 57 and the manual button 51 should not interfere with each other. Therefore, a notch 61 into which the manual button 51 enters is formed in the stopper 57. In order to slide the stopper 57 with respect to the pilot block 19 between the retracted position and the engaged position, the stopper 57 slides along a guide surface (not shown) formed in the pilot block 19. A moving sliding work 62 is provided on the stopper 57 as shown in FIG. 3, and the sliding work 62 is a slit 6 3 formed in the pilot block 19 as shown in FIG. 4 (A). Penetrates.

FIG. 5 is a sectional view showing a solenoid valve according to another embodiment of the present invention, in which the manifold block 10 shown in FIG. 1 is omitted. In FIG. 5, members common to those shown in FIGS. 2 and 3 are denoted by the same reference numerals. The solenoid valve 11 shown in FIG. 5 has a pie port block 19 provided with a solenoid section 32 on both sides of a main valve block 15 similar to that shown in FIG. 2 as shown in FIG. Installed. Therefore, this solenoid valve is a double solenoid type two-position valve in which pistons 27 of the same outer diameter are provided at both ends of the main valve shaft 17, and two solenoid valves are provided for one solenoid valve. As a result, two manual buttons 51 are provided. Although the solenoid valve 11 shown in Fig. 5 is a two-position valve, the main valve shaft 17 is set to the neutral position by spring force, and the main valve shaft 17 is If it is moved to the position at the end of the stroke, a three-position valve can be obtained. As shown in the figure, the pilot valve formed by the on-off valve 37 and the flapper valve 44 connects the output passage with the supply passage 39 and the exhaust passage 42 by the plunger of the solenoid part 32, that is, the movable iron core 36. This is a direct-acting solenoid valve that switches to and communicates with itself, and can be used as a single unit as a 3-port solenoid valve. In this case, the direct-acting solenoid valve can also be operated manually by attaching the manual button 51.

The present invention is not limited to the above-described embodiment, and can be variously modified without departing from the gist thereof. For example, Fig. 1 shows a manifold type solenoid valve in which a plurality of solenoid valves are mounted on the manifold block 10. However, the solenoid valve 11 shown in Fig. 1 may be used as a single unit. It is possible.

According to the present invention, the pilot valve can be used regardless of whether the solenoid valve of the indirect operation type having the pilot valve operated by the solenoid is used as a single unit or the manifold valve is mounted on a manifold block. Even when used as a direct acting solenoid valve, the valve can be operated by a manual button, and the manual button can be prevented from being operated due to malfunction by a stopper. Industrial applicability

An electromagnetic valve having a valve element that is operated by an electromagnet, and is used as a directional control valve for controlling the supply and stop of air pressure to a pneumatically operated device to which air pressure is supplied via a pneumatic circuit. You. This solenoid valve is used both as a single solenoid valve and as an indirectly actuated solenoid valve for operating the main valve shaft.

Claims

The scope of the claims

1. A valve casing having an accommodating hole communicating with the air supply port, the output port, and the exhaust port;

A main valve shaft that is provided in the accommodation hole so as to be reciprocally movable in the axial direction, and that switches the output port between the air supply port and the exhaust port to communicate therewith;

A solenoid portion provided with a movable iron core attached to the valve casing and reciprocating in an axial direction by energizing a coil;

A pilot mounted on the valve casing in conjunction with the movable iron core, for switching an output passage communicating with an air pressure chamber accommodating the piston to an air supply passage and an exhaust passage communicating with the air supply port and communicating therewith; A valve,

A manual button mounted on the valve casing so as to be reciprocally movable, and actuating the pilot valve to a position for communicating the output passage and the air supply passage by a pushing operation;

An electromagnetic valve, comprising: a stopper mounted on the valve casing so as to be engageable with the manual button, and a stopper for restricting a pushing movement of the manual button.

2. The solenoid valve according to claim 1, wherein pistons are provided at both ends of the main valve shaft, and two pistons respectively operated by the solenoid portions corresponding to two pneumatic chambers accommodating the respective pistons. An electromagnetic valve having a mouth valve.

3. The solenoid valve according to claim 2, wherein the main valve shaft moves to two or three positions.

4. An air supply passage having an open end formed in the first valve seat, an exhaust passage having an open end formed in the second valve seat opposite to the first valve seat, and A valve casing formed with an output passage for guiding the air flowing out of the air supply passage to an output portion; and a movable iron core attached to the valve casing and reciprocating in an axial direction by energizing a coil. Solenoid part and

An on-off valve provided on the movable iron core to open and close the first valve seat;

A flapper valve arranged in the valve casing so as to face the on-off valve, and driven by the movable core via an interlocking pin to open and close the second valve seat; A manual button that is reciprocally mounted on the knob casing and that operates the opening / closing valve to a position that allows the output passage and the air supply passage to communicate with each other by a pushing operation; and engages the manual button with the knob casing. An electromagnetic valve, which is freely mounted, and has a stopper for restricting the pushing movement of the manual button.