JPS6216544Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pneumatically operated valve that opens and closes a passage of air supplied to a pneumatically operated device.

The purpose of this invention is to apply for a patent application relating to the applicant's earlier application.
- To provide an air operated valve according to the invention of No. 182875 (Utility Model Application Publication No. 55-98869) which ensures the return of its interlock ball and has high operational stability and reliability. There is a particular thing.

In other words, Utility Application No. 182875 (1982)
The configuration of the air operated valve according to the invention of Publication No. 98869),
The action is as shown in FIGS. 1A and 1B. 1 in the diagram
is a spool valve installed in the main air passage 3 of the housing 2, and the piston 1a on the upper end side is configured to slide on the inner surface of the cylinder portion 4a of the air chamber 4, and is subjected to the action of a pressing spring 16. There is. Further, the lower end side of the spool valve 1 is connected to a piston 6 that slides within an air chamber 5 for self-holding of the spool valve. Therefore, the spool valve 1 has two pistons 1 above and below it.
It moves up and down due to the air pressure difference and spring action acting on a and 6. The upper chamber of the piston 6 is a sheathing air chamber 7, which is communicated with a front chamber 10 of a shearing piston 9 through a shearing air passage 8. The valve portion 1b of the spool valve 1 comes into contact with and separates from a valve seat 11 formed at the end of the main air passage 3 that communicates with the air inlet 12. The other side of the main air passage 3 is communicated with an air outlet 13. Further, the main air passage 3 and the spool valve self-holding air chamber 5 are communicated through a passage 14.

Next, reference numeral 15 in the figure is an auxiliary valve for opening and closing the air chamber 4 on the upper end side of the spool valve 1 to release it to the atmosphere, and its back chamber is communicated with the air hole 17.
A pressure spring 18 is installed between the auxiliary valve 15 and the piston 1a. The air chamber 4 and the air inlet 12 are communicated through an orifice 19. In addition, 20 in the figure is the valve shaft portion 15 of the auxiliary valve 15.
It is a ball that intervenes between and connects the input rod 21 and the input rod 21 located above it, and the piston rod 9a of the cylindrical piston 9 is in contact with the piston rod 9a on the right side, and the return spring 22 is in contact with the left side. The ball 20 is supported by these. The return spring 22 is installed in a ball chamber 23 that allows the ball 20 to be displaced. The input rod 21 is installed so that it can be raised and lowered, and the movable iron core 2 of the valve driving electromagnet 24 located directly above it
It is adapted to be pushed downward by the output rod 24b of 4a. Electromagnet 24 is installed in integral relationship with housing 2. 24c in the diagram
is the movable core return spring.

When the electromagnet 24 is energized in the air-operated valve in the closed state shown in FIG. 1A, the movable core 24 descends,
The auxiliary valve 15 connected via the input rod 21 and ball 20 is pushed down and opened. As a result, the air chamber 4 is reduced to atmospheric pressure, and the upward air pressure acting on the valve portion 1b of the spool valve 1 and its piston 1a overcomes the downward force exerted by the pressure springs 16 and 18, causing the spool valve 1 to rise. Then open the main air passage 3 as shown in Figure 1B. As a result, the high-pressure air to be supplied to the pneumatic operating equipment is transferred to the air inlet 1.
2 into the valve, through the main air passage 3 and out to the air outlet 13. At the same time, a portion of the high-pressure air flows from the passage 14 into the spool valve self-holding air chamber 5 and pushes the spool valve 1 upward via the piston 6. Therefore, even if the electromagnet 24 is demagnetized and high-pressure air flows into the closed air chamber 4 through the orifice 19 and the air pressure increases, the spool valve 1 is self-maintained in the open state.

Next, in order to close the air-operated valve, deflation air is supplied to the front chamber 10 of the deflation piston 9 through the nozzle 25. As a result, the piston rod 9a of the shedding piston 9 pushed by the pressure of the shedding air pushes the ball 20 to the left as shown in FIG. It intervenes between the rods 21 and becomes interlocked. At the same time, the cooling air flows into the cooling air chamber 7 and lowers the piston 6. As a result, the spool valve 1 is pushed down by the pressure springs 16 and 18 and is again in the closed state as shown in FIG. 1A. After that, when the interlock is released or the supply of cutoff air is stopped, the ball 20 moves the cutoff piston 9 back to the right by the return spring 22 and connects the input rod 21 and the valve stem 15a. By intervening in between, the state shown in FIG. 1B is restored.

The configuration of the conventional pneumatically operated valve is as described above, but the drawback is that when the interlock is released, the input rod 21 is forced to move against the piston rod 9 due to its weight.
a, and the return spring 22
In order to push the ball 20 back to the right by the input rod 21, use the rightward displacement of the ball 20.
must be pushed up, resulting in unstable vertical position of the ball 21 or sliding of the input rod 21.
The return of the ball 20 is often not carried out smoothly due to the warping effect, and as a result, the subsequent opening operation of the air operated valve is not carried out smoothly.

The present invention has been made to solve the above-mentioned drawbacks.

The features of the present invention, in the air-operated valve having the above structure, include a return spring that maintains the input rod in the raised position, and a movable iron core that is installed between the output rod and the input rod of the electromagnet that pushes the input rod. The point is that the structure has a spring.

Next, an example of the present invention will be described.

2A and 2B show a pneumatically operated valve according to an embodiment of the present invention. Most of the configuration of this air operated valve is
Since the configuration is the same as that of the pneumatically operated valve shown in FIGS. A and B, the same reference numerals are given and the explanation thereof will be omitted. and,
The air-operated valves shown in FIGS. 2A and 2B are different from those shown in FIGS. 1A and 1B in that the input rod 21' is connected to the valve stem 15a of the auxiliary valve 15 via a ball 20 and is movable up and down. has a spring receiving flange 2 on its upper end.
1a, and a coil-shaped return spring 26 is wound between the spring receiving flange 21a and the housing 2 to maintain the raised position of the input rod 21', and also to push the input rod 21' downward. A coiled movable core return spring 24c is wound between the output rod 24b of the movable core 24a of the electromagnet 24' installed directly above the electromagnet 24' and the upper end surface of the input rod 21'.

The upper end of the output rod 24b has a spring receiving flange 24b' whose upper limit position (the position shown in FIG. 2B) is defined by the frame of the electromagnet 24'.

When the weight of the input rod 21' is about 10g, the strength of the return spring 26 and the movable core return spring 24c is set to a load of 0.5Kg to 2Kg, and the input rod 2
1' is reliably raised by the action of the return spring 26, and maintains an unbalanced force with the movable core return spring 24c. It is designed to stop at a position that does not interfere with the movement.

According to the above structure, when in the interlock state shown in FIG. 2B, the input rod 21' is always pushed up to a certain raised position by the return spring 26 and maintained at that position. Therefore, when the cutting air is stopped to release the interlock, the ball 20 is pushed back to the right by the action of the return spring 22 that overcomes the force of the cutting piston 9.
At that time, the input rod 21' does not hinder the movement of the ball 20, and the ball 20 returns reliably. Therefore, the electromagnet 24' continues to operate and its output rod 2
4b pushes the input rod 21' downward,
As shown in FIG. 2A, the input rod 21' is concentrically connected to the auxiliary valve 15 via the ball 20, so that the opening operation is performed smoothly.

In addition, FIG. 3 shows the ball 20 and its return spring 2.
An example of an air-operated valve in which a ball holder 27 is interposed between 2 and 2 is shown. With this configuration, the ball 20 and the return spring 22 do not come into direct contact with each other, which has the effect of increasing the stability of the movement of the ball 20.

Since the present invention is constructed as described above, it has the effect of providing a pneumatically operated valve with high stability and reliability in the return operation of the interlock ball, and with good precision and performance. .

Furthermore, compared to the case where the movable core return spring is directly wound around the movable core, the actual height of the electromagnet can be reduced, and the air-operated valve can be made smaller.

[Brief explanation of drawings]

Figures 1A and B are cross-sectional views showing the operating state of a conventional air-operated valve, Figures 2 A and B are cross-sectional views showing the operating state of an air-operated valve according to an embodiment of this invention, and Figure 3 is a pneumatically operated valve. FIG. 4 is a cross-sectional view showing a portion of a different configuration of the valve. 3... Main air passage, 16, 18... Pressing spring,
19... Piston, 6... Piston, 1... Spool valve, 4... Air chamber, 15... Auxiliary valve, 5...
Spool valve self-holding air chamber, 7...Shrinking air chamber, 21, 21'...Input rod, 9...Shrinking piston, 22...Ball return spring, 26...
...Input rod return spring, 24, 24'...Electromagnet, 24b...Output rod, 24c...Movable core return spring.

Claims (1)

[Scope of utility model registration request] It comprises a spool valve 1 which is interposed in the main air passage 3 and moves due to the air pressure difference and spring action acting on both ends of the spool valve 1, and an auxiliary valve which opens and closes the air chamber 4 at one end of the spool valve 1. A piston 6 is interposed at the other end of the spool valve 1 to form a spool valve self-retaining air chamber 5 and a spool air chamber 7 communicating with the spool air passage 8, and the main air passage 3 and the spool valve self-holding air chamber 5 are connected to each other, and an input rod 21 for operating the auxiliary valve is connected to the valve shaft 15a at the end of the auxiliary valve 15 by holding a movable ball 20 therebetween. . Therefore, the ball 20 is moved between the valve shaft portion 15a of the auxiliary valve 15 and the input rods 21, 2 against the pressure of the return spring 22 applied to the ball 20.
1', and the shaft 9a of the piston 9 is inserted between the valve shaft 15a of the auxiliary valve 15 and the input rods 21, 21'.
In addition, a return spring 26 is provided to maintain the raised position of the input rods 21, 21' when the ball 20 is pushed out, and the output rod 24b and the input rod 21 of the electromagnets 24, 24' that push the input rods 21, 21' are provided. , 21', the movable core return spring 2
An air operated valve characterized by having 4c installed.