JP2000274550A - Multiple valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability of a sheet packing on a multiple valve device. SOLUTION: It is devised to prevent mass of a plunger from having influence upon a valve body return spring by interposing a plunger return spring 23 to return a plunger 10a of a solenoid between a presser member and a valve chest on a multiple valve device furnished with a plural number of valve bodies 2, 3 provided in the valve chest 1 free to advance and retreat in directions in parallel with each other, the presser member 4 to interlock these valve bodies, one solenoid 10 to drive each of the valve bodies through the presser member and a valve body return spring 11 to return the valve bodies in a direction of the solenoid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiple valve device, and more particularly to an improvement in the durability of a valve seat.
The present invention relates to a multiple valve device that improves the smoothness and reliability of operation.

[0002]

2. Description of the Related Art Conventionally, among multiple valve devices having a plurality of valve elements, there is a type in which a plurality of valve elements are synchronously driven by one solenoid. For example, as shown in FIG. 3, a plurality of valve bodies 102 and 103 provided in a valve box 101 so as to be able to advance and retreat in parallel directions as a solenoid direct acting single acting balance type poppet 5 port solenoid valve, and these valves Body 10
There is a multiple valve device that includes a plate-shaped interlocking member 104 that interlocks the two and three and a single solenoid 105 that drives each of the valve bodies 102 and 103 and the interlocking member 104 (US Pat. No. 4,494,572). Reference).

[0003] Each valve element 102, 103 is screwed into an interlocking member 104, and each valve element 102, 103 is returned to a return spring 109.1.
By urging the solenoid 105 toward the solenoid 105 side, the interlocking member 104 is attached to the plunger 106 of the solenoid 105.
Is being received. When the solenoid 105 is energized, the interlocking member 104 and each of the valve bodies 102 and 103 are moved to the opposite side of the solenoid 105, and the pressure fluid supply chamber 107 in the valve box 101 is communicated with the port A connected to the load circuit. The other port B connected to the load circuit communicates with the exhaust chamber 108 in the valve box 101.

When the energization of the solenoid 105 is stopped, each of the valve bodies 102 and 103 returns to a return spring 109 or 110.
The port B is connected to the pressure fluid supply chamber 107 in the valve box 101, and the port A is connected to the exhaust chamber 108. FIG. 4 shows a solenoid direct acting single acting balance type poppet 5-port solenoid valve (JP-A-8-135833).

[0005] Valve bodies 202 and 203 provided in a valve box 201 so as to be able to advance and retreat in directions parallel to each other, and these valve bodies 202
An interlocking member 204 for interlocking 203 and each valve body 202
A single solenoid 211 for driving the actuator 203 via an interlocking member 204, and supported by the valve bodies 202, 203 so as to be able to advance and retreat within a predetermined range in the advance and retreat directions of the valve bodies 202, 203, A contact member 205 that is independently abutted against the interlocking member 204; and a spring 206 that is received by the valve bodies 202 and 203 and presses the abutment member 205 supported by the valve bodies 202 and 203 against the interlocking member 204. And

[0006]

In the conventional solenoid direct acting single acting balanced type poppet 5-port solenoid valve shown in FIG. 3, the load of each of the valve bodies 102 and 103 is such that the corresponding ports A and B supply pressure. Each valve element 102 differs depending on whether it is connected to the chamber 107 or the exhaust chamber 108.
The force acting on the interlocking member 104 from 103 becomes unbalanced.

If such an unbalanced load acts on the interlocking member 104 or the center point between the axes of the valve bodies 102 and 103 deviates from the axis of the plunger 106 of the solenoid 105, the A difference occurs in the operation of the valve bodies 102 and 103, and the interlocking member 104 is tilted, and each of the valve bodies 102 and 103 and the interlocking member 10 that are guided and advanced by the valve box 101.
4 move while prying each other, and the smoothness of operation of each of the valve bodies 102 and 103 is impaired. In addition, if there is a difference between the operations of the respective valve elements 102 and 103, the sealing performance of the valves may be reduced and reliability may be impaired.

Further, in order to ensure the tightness of the valve,
Solenoid 1 for strokes of valve bodies 102 and 103
05 do the plunger 106 have the same stroke,
Although it is necessary to make the stroke larger than that, it is actually difficult to accurately adjust the stroke of the plunger 106 to the strokes of the valve bodies 102 and 103.
The stroke of the plunger 106 is set to be slightly larger than the stroke of 103.

Therefore, the amount of movement of the plunger 106 during energization is limited by the strokes of the valve bodies 102 and 103, and the plunger 106 of the solenoid 105 and the yoke 11
There is a gap between the two. Here, when a DC solenoid is used as the solenoid 105, there is no particular problem. However, when an AC solenoid is used as the solenoid 105, a growl occurs and the coil may be burned out.

Therefore, such a plurality of valve elements 102
· 103 is connected to one solenoid 1 via the interlocking member 104
The AC solenoid cannot be used in the multiple valve device that is driven synchronously at 05, and its appearance can hardly be seen in the actual market. Also, the conventional solenoid direct acting single acting balanced type poppet 5-port solenoid valve shown in FIG. 4 is not always sufficient to enhance the smoothness and reliability of operation.

Further, in the conventional solenoid direct acting single-acting balanced poppet 5-port solenoid valve shown in FIGS. 3 and 4, the opening and closing of the valves 102, 103, 202 and 203 are controlled by the electromagnetic force of the solenoids 105 and 211. Valve body return spring 109
-It depends on 110, 209 and 210. The spring force required for the valve element return spring is as follows: (1) Valve element mass (+) (2) Friction resistance of valve element packing (+) (3) Sealing force (Seal surface pressure) (+) (4) ) The sum of the plunger mass of the solenoid.

When the compressed air is supplied to the compressed air supply port P, only the sealing force (seal surface pressure) acts on the packing seal surface F, but it moves during storage (when no pressure is supplied). When the possible plunger is horizontal or downward, a spring force corresponding to the mass of the plunger is applied to the packing seal surface F, and the sheet packing is deformed or scratched for a long time.

[0013] Further, since the overtravel spring is mounted for each valve element, the axial dimensions of the valve element are difficult to be uniform, and imbalance in spring force occurs. Further, since the overtravel spring is mounted for each valve element, the number of parts is increased and the cost is increased.

[0014]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a plunger return spring separately from a valve element return spring so that the plunger mass does not affect the valve element return spring. In order not to deform the seat packing or to scratch the seat packing,
A plurality of valve elements provided in the valve box so as to be able to advance and retreat in directions parallel to each other, a push member for interlocking these valve elements, one solenoid for driving each valve element via the push member, and a valve element. In a multiple valve device including a valve body return spring for returning to the solenoid, a plunger return spring for returning the plunger of the solenoid is interposed between the pushing member and the valve box, and the mass of the plunger is applied to the valve body return spring. A multi-valve system was used to avoid any influence.

Further, in order to enhance the smoothness and reliability of the operation of the plurality of valve bodies, the present invention supports the plunger and supports the valve bodies so as to be able to advance and retreat within a predetermined range in the advance and retreat direction of the valve bodies, and engages with the pushing member. And a single overtravel spring that biases the bumper against the plunger,
A multiple valve device in which a plurality of valve elements are actuated by push members.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A multiple valve device according to an embodiment of the present invention will be specifically described below with reference to the drawings. A multiple valve device according to one embodiment of the present invention shown in the cross-sectional view of FIG. 1 is one in which the present invention is applied to a solenoid direct acting single acting pressure balanced poppet 5-port solenoid valve. In the figure, two valve bodies 2 and 3 provided to be able to move up and down in the vertical direction are provided.

An exhaust port R1 and a compressed air supply port P communicating with the left valve chamber 1a are vertically opened on the left side of the valve box 1, and open on the right side with the right valve chamber 1b. The exhaust port R2 and the compressed air supply port P are vertically opened. In addition, an output port A for connecting one output circuit of the load circuit to the left valve chamber 1a and another output circuit of the load circuit for the right valve chamber 1b are provided on the front of the valve box 1 as shown by a broken line. And an output port B that communicates with the left and right ports are opened side by side.

A push member 4 is arranged above the valve bodies 2 and 3 so as to be vertically movable therein. A bumper 21 is fitted inside the shaft of the pressing member 4 so as to be able to move up and down, and a pin 5 is provided on the bumper 21 so as to be orthogonal to the shaft. A floating hole 6 having a diameter larger than that of the pin 5 is formed in the pressing member 4, and the pin 5 is inserted into the floating hole 6 to limit the range of the bumper 21 with respect to the pressing member 4. An overtravel spring 22 is inserted between the upper part of the pushing member 4 and the bumper 21, and the overtravel spring 22 urges the bumper 21 upward to support the plunger 10 a of the solenoid 10. Conventionally, the overtravel spring is
Although a plurality of overtravel springs caused the unbalance force, a single overtravel spring is used here to eliminate the unbalance force of the spring force, and at the same time, a plurality of overtravel springs is reduced to one to reduce cost. .

A plunger return spring 23 is interposed between the lower surface of the pressing member 4 and the valve box 1 so that the valve body return spring 11 described below can be downsized. The spring force required for the valve element return spring is as described above. Among them, the mass of the plunger mass of the solenoid occupies a large weight. A plunger return spring 23 is interposed between the lower surface of the pressing member 4 and the valve box 1 so that the mass of the plunger 10a does not affect the valve element return spring 11. Thereby, no extra force is applied to the seat packing, and the durability of the seat packing is improved.

A solenoid 10 is mounted on the upper side of the valve box 1, and a lower end surface of a plunger 10 a of the solenoid 10 is received by an upper end of the bumper 21. A valve element return spring 11 for urging the valve elements 2 and 3 upward is provided below each of the valve elements 2 and 3 in the valve box 1. In this multiple valve device, when the solenoid 10 is in a non-energized (OFF) state (the state on the right side in the cross-sectional view of FIG. 1), the valve body return spring 1
1, the valve bodies 2 and 3 are moved upward, and the valve body 2 shuts off the left valve chamber 1a from the compressed air supply port P and connects the left valve chamber 1a to the exhaust port R1. Port A is communicated with exhaust port R1. The valve body 3 shuts off the right valve chamber 1b from the exhaust port R2 and connects the right valve chamber 1b to the compressed air supply port P, thereby connecting the output port B to the compressed air supply port P.

When the solenoid 10 is energized (ON) (FIG. 1)
When the plunger 10a descends, the bumper 21 also descends. As a result, the plunger 10a comes into contact with the yoke 10b, and the bumper 21 further moves the overtravel spring 22 and the pin 5 through the floating hole 6. , The pin 5 comes in contact with the pressing member 4 to lower the pressing member 4, and each valve body 2
Is moved downward. Thereby, the valve body 2 connects the left valve chamber 1a to the compressed air supply port P and shuts off the left valve chamber 1a from the exhaust port R1, so that the output port A is connected to the compressed air supply port P.

Further, the valve element 3 connects the right valve chamber 1b to the exhaust port R2 and disconnects the right valve chamber 1b from the compressed air supply port P, thereby connecting the output port B to the exhaust port R2. . FIG. 2 shows the solenoid direct acting single acting pressure balanced poppet 5-port solenoid valve as indicated by JIS symbols.

When the solenoid 10 is energized, the plunger 10a descends, the bumper 21 moves downward against the biasing force of the overtravel spring 22, and the pin 5 also moves downward. , The push member 4 also moves downward, and abuts against the upper end surfaces of the valve bodies 2.3 to move the valve bodies 2.3 downward. Thereby, the valve body 2 connects the left valve chamber 1a to the compressed air supply port P and shuts off the left valve chamber 1a from the exhaust port R1, so that the output port A is connected to the compressed air supply port P.

The valve body 3 connects the right valve chamber 1b to the exhaust port R2 and shuts off the right valve chamber 1b from the compressed air supply port P, thereby connecting the output port B to the exhaust port R2. . When the compressed air is being supplied to the compressed air supply port P, the loads acting on the respective valve elements 2 and 3 are different. Therefore, the pressing member 4 urged by one overtravel spring 22 is used. The pressing member 4 moves up and down smoothly.

As a result, the plunger 10a can be lowered until the plunger 10a comes into close contact with the yoke 10b of the solenoid 10, so that there is no danger of groaning or burning of the coil even when an alternating current is supplied to the solenoid 10. In addition,
In each of the above embodiments, the floating hole 6 is formed of a circular hole, but may be formed of a vertically long slot.

The floating hole 6 may be formed in the dam bar 21 instead of being provided in the pushing member 4, and the pin 5 may be supported by the pushing member 4. Further, in each of the above embodiments, the case where the present invention is applied to a five-way valve is taken as an example. However, the present invention relates to a multiple valve device other than a five-way valve, for example, a two-way three-way valve such as a two-way valve.
The present invention can be widely applied to a multiple valve device that synchronously drives at least one valve element with one solenoid.

[0027]

According to the present invention, as described above, a plurality of valve elements provided in a valve box so as to be able to advance and retreat in directions parallel to each other, a pushing member for interlocking these valve elements, In a multiple valve device including one solenoid driven through a member and a valve body returning spring for returning a valve body to the solenoid, a plunger for returning a solenoid plunger between a pushing member and a valve box. Since it is a multiple valve device in which a return spring is interposed to prevent the mass of the plunger from affecting the valve body return spring, the valve body return springs of a plurality of valve bodies having a valve switching function and the solenoid plunger are returned. By providing independent plunger return springs, the seat packing is not deformed and the seat packing is not scratched, improving the durability of the valve seat It was.

Further, according to the present invention, there is provided a bumper which abuts against a plunger and is supported so as to be able to advance and retreat within a predetermined range in the advance and retreat direction of a valve body and engages with a pushing member. With two overtravel springs,
Since it is a multiple valve device in which a plurality of valve elements are actuated by push members, the smoothness and reliability of operation are improved, and one overtravel spring is used to eliminate unbalance force of spring force. One or more overtravel springs
It can be a book and cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention when power is not supplied and when power is supplied.

FIG. 2 is a diagram of a solenoid direct acting single acting pressure poppet 5 port solenoid valve according to the present invention, which is represented by a JIS symbol.

FIG. 3 is a sectional view of a conventional example.

FIG. 4 is a sectional view of another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Valve box 1a / 1b ... Valve chamber 2.3 ... Valve body 4 ... Push member 5 ... Pin 6 ... Floating hole 10 ... Solenoid 10a ... Plunger 10b ... Yoke 11 ... Valve body return spring 21 ... Bumper 22 ... Over travel spring 23… Plunger return spring

Claims (2)

[Claims] 1. A plurality of valve bodies provided in a valve box so as to be able to advance and retreat in directions parallel to each other, a push member for interlocking these valve bodies, and one solenoid for driving each valve body via the push member. And a valve body return spring for returning the valve body to the solenoid, wherein a plunger return spring for returning the plunger of the solenoid is interposed between the pressing member and the valve box, and the valve body return spring is provided. Multiple valve device that prevents the mass of the plunger from affecting. 2. A bumper which abuts against the plunger and is movably supported within a predetermined range in the advancing and retreating direction of the valve body and engages with the pressing member, and one overtravel spring for urging the bumper to abut on the plunger. 2. The multiple valve device according to claim 1, further comprising: a plurality of valve elements that are operated by a pressing member.