JPS6214462Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a switching display mechanism for a pneumatic four-way switching valve.

Conventionally, in order to detect whether pressurized air is being applied to the output port of a pneumatic four-way switching valve used in pneumatic control equipment, etc., it is necessary to remove a part of the piping and check for the presence or absence of pressurized air. Judgment was made by observing or by the movement of the actuator.

However, attaching and detaching the piping takes a very long time and is dangerous if the air pressure is high. Also,
Judging by the operation of the actuator is
This is extremely difficult when this is located far away or is shielded, or when a large number of pneumatic four-way switching valves and actuators are connected.

Therefore, an object of the present invention is to solve the above-mentioned difficulties by incorporating a mechanism in the pneumatic four-way switching valve itself to indicate whether or not pressurized air is being applied to its output port. To provide a switching display mechanism for a pneumatic four-way switching valve, which is compact, and allows the switching state of the pneumatic four-way switching valve to be easily and reliably checked without the need for any additional equipment, and also allows for easy repair, inspection, and adjustment of control equipment. It is in.

In order to achieve this purpose, the present invention uses a flow path switching mechanism built into a four-way pneumatic switching valve to communicate with the output port through a guide hole when the pressurized air inlet is communicated with one of the output ports. The tip of the piston fitted in one of the cylindrical holes protrudes from the outer surface of the base of the pneumatic four-way switching valve by a predetermined constant dimension, and the tip of the other piston is recessed into the inside of the base, and the tip of the piston is fitted into one of the cylindrical holes. The protrusion or retraction of the tip indicates the switching state of the pneumatic four-way switching valve.

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

FIG. 1 is a partial longitudinal sectional view of an embodiment of a pneumatic four-way switching valve incorporating a switching display mechanism according to the present invention.

In the pneumatic four-way switching valve of this embodiment, a hole 2 is provided in the axial direction of a columnar base 1, and a spool 4 fitted with O-rings 3, 3, etc. is slidably fitted into this hole 2. A flow path switching mechanism is constructed by the following. Further, the base 1 is provided with a pressurized air inlet 5, an air outlet 6, 7, and two output ports 8, 9, and an electromagnetic device 10 is attached to one end of the base 1 so that the movable The spool 4 is connected to the spool 4.

That is, in the state shown in FIG. 1, the output port 9 is communicated with the pressurized air inlet 5, and the output port 8 is communicated with the discharge port 6. Further, when the spool 4 is moved upward from the position shown in FIG. 1 by the electromagnetic device 10, the output port 8 is communicated with the pressurized air inlet 5,
Output port 9 is connected to discharge port 7 .

In this embodiment, cylindrical holes 11 and 12 communicating with each of the output ports 8 and 9 are formed inside the base 1 itself of such a four-way switching valve for pneumatic pressure, and the holes 11 and 12 are connected to each other. Each of a pair of pistons 13 is slidably fitted and built in, and the tips 14 of the pistons 13 are alternately protruded from the openings of the holes 11 or 12 to the outer surface of the base 1 in the circumferential direction. By immersing it inside, it displays the switching status of the pneumatic four-way switching valve.

Figure 2 is an enlarged view of the hole 11.
A spring 16 for pressing the piston 13 toward the base end 15 is provided inside the piston 13.
A gasket 17 such as an O-ring for sealing the circumferential surface of the piston is fitted into a groove in the base 1 to face the step between the piston 13 and its tip 14, and the piston in the holes 11 and 12 is proximal end 15 of 13
The portions facing each other can be alternately communicated with the output ports 8 or 9 through the respective guide holes 18 as described above.

As described above, the configuration of the present embodiment is a pneumatic pump equipped with a flow path switching mechanism such as the spool 4 for connecting the output port 8 or 9 to the pressurized air inlet 5 or the air outlet ports 6, 7. In the four-way switching valve for
A cylindrical hole 11 or 12 communicating with the output ports 8 and 9 of the base 1, respectively, is formed in the base 1 itself, and a piston 13 is slidably fitted therein, and the tip 14 of the piston 13 is inserted. A spring 16 that faces toward the outer surface of the base 1 and presses the piston 13 toward its base end, and an O that seals the circumferential surface of the piston.
A gasket 17 like a ring is provided, and the portion of the cylindrical hole 11 or 12 facing the base end of the piston 13 is connected to the base by the guide hole 18 according to the respective outputs of the output ports 8 and 9. One side protrudes from the outer surface of the stand 1 and the other side is recessed to display the switching state of the pneumatic four-way switching valve.

Next, the operation of this embodiment will be explained.

In the above-mentioned pneumatic four-way switching valve, in the state shown in FIG. 1, the output port 8 is communicated with the discharge port 6, and the output port 9 is communicated with the pressurized air inlet 5. For this reason, high pressure air is not applied to the hole 11.
The piston 13 in the hole 11 is pushed toward its proximal end by the force of the spring 16, and its tip 14 is completely recessed into the interior of the base 1.

On the other hand, since the pressure of pressurized air is applied to the hole 12 from the output port 9 through the guide hole 18, the spring 1
The piston 13 moves toward its tip against the elastic force of the base 1, and the tip 14 protrudes from the outer surface of the base 1 by a predetermined constant dimension.

Further, as described above, when the electromagnetic device 10 moves the spool 4 upward from the position shown in FIG. , the output port 9 is communicated with the discharge port 7. Therefore, the tip 14 of the piston 13 fitted in the hole 11 protrudes from the outer surface of the base 1 as shown by the chain line in FIG. The tip 14 moves toward the tip and completely immerses into the base 1.

Therefore, in this embodiment, it is possible to visually clearly confirm whether or not the tip of the piston 13 protrudes from the outer surface of the base 1, so that the switching state of the pneumatic four-way switching valve can be easily and reliably confirmed. .

In addition, FIG. 3 shows another embodiment of the above-mentioned holes 11 and 12, in which the packing 17 is fitted into the groove of the piston 13 to make sliding contact with the inner surface of the hole 11, etc., and the guide hole 18 is inserted into the piston 13. It is provided on the base 1 on the inner end side in the axial direction.

Further, although the above embodiments have been described with respect to a spool valve, it goes without saying that the present invention can be applied to any type of pneumatic four-way switching valve, such as a poppet type or a diaphragm type.

As explained above, in the switching display mechanism of the pneumatic four-way switching valve of the present invention, when one of the output ports is communicated with the pressurized air inlet, the tip of the piston corresponding to that output port is The piston protrudes from the outer surface of the base by a predetermined constant dimension to indicate this, and at that time the other piston is completely recessed into the base, thereby making it possible to easily and easily change the switching state of the pneumatic four-way switching valve. Not only can this be confirmed reliably, but also the display can be effectively utilized when adjusting or repairing the control equipment.

In addition, by using two pistons as a set, and having each piston alternately protrude or retract into the outer surface of the base depending on the switching state of the pneumatic four-way switching valve, one piston can be moved only by a certain dimension. When the piston is protruding, the other piston is completely retracted, so that the switching operation can be clearly indicated.

Furthermore, since a switching display section such as a piston for switching display is built into the base, the pneumatic four-way switching valve can be further downsized.

Moreover, in the pneumatic four-way switching valve of the present invention, a gasket is provided as an airtight sealing means between a part of the outer periphery of one set of pistons and the inner surface of the cylindrical hole. It is possible to reliably prevent pressure air from leaking from the

[Brief explanation of the drawing]

Fig. 1 is a partial vertical sectional view of an embodiment of a pneumatic four-way switching valve incorporating a switching display mechanism according to the present invention, Fig. 2 is a partial sectional view enlarging a part of Fig. 1, and Fig. 3 is FIG. 3 is an enlarged partial cross-sectional view of a portion corresponding to FIG. 2 in another embodiment of the present invention; 1... Base, 2... Hole, 3... O-ring, 4...
... Spool, 5... Pressurized air inlet, 6, 7...
... Air discharge port, 8, 9 ... Output port, 10 ... Electromagnetic device, 11, 12 ... Hole, 13 ... Piston, 14 ... Piston tip, 15 ... Piston base end, 16 ... Spring, 17... Patsukin, 18
...Guiding hole.

Claims (1)

[Scope of utility model registration request] A four-way switching valve for pneumatic pressure that has a built-in flow path switching mechanism that alternately switches each of the output ports 8 and 9 to communicate with the pressurized air inlet 5 or the air outlet ports 6 and 7, Cylindrical holes 11 and 12 are formed in the base 1 of the four-way switching valve, and a pair of pistons 13 and 13 are slidably housed in the cylindrical holes 11 and 12, respectively. ，
The tips 14, 14 of the pistons 13 are alternately made to protrude by a predetermined constant dimension or completely retract from the outer surface of the base 1, and the pistons 13, 13 are pressed in the direction of their base ends 15, 15. a spring 16;
A part of the outer periphery of the pistons 13, 13 and the cylindrical hole 1
A gasket 17 is provided to airtightly seal between the inner surfaces of the pistons 1 and 12, and the ends of the cylindrical holes 11 and 12 opposite to the proximal ends 15 and 15 of the pistons 13 and 13 are connected by guide holes 18 and 18. The output port 8
or 9 respectively, and when the pressurized air inlet 5 is communicated with either the output port 8 or 9 by the flow path switching mechanism, the pressurized air is communicated with the output port 8 or 9 through the guide hole 18. The tip 14 of the piston 13 fitted into one of the cylindrical holes 11 or 12 protrudes from the outer surface of the base 1 by a predetermined constant dimension, and the tip 14 of the other piston 13 is completely immersed inside the base 1. The switching state of the pneumatic four-way switching valve is indicated by alternately protruding and retracting the tips 14, 14 of the pistons 13, 13 by a predetermined constant dimension or completely retracting. A switching display mechanism for pneumatic four-way switching valves.