JPS6037497Y2 - exhaust valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exhaust valve device, and more particularly to an exhaust valve device that releases pressurized air supplied to a pneumatic device to the atmosphere for repair or the like.

2. Description of the Related Art Generally, in various types of pneumatic equipment such as air cylinders, pressurized air is released into the atmosphere for repair or inspection purposes.

Conventionally, this is the first exhaust valve for releasing such pressurized air.
The one shown in the figure is known.

In the figure, the exhaust valve 50 is a three-port valve having a primary flow path 52, a secondary flow path 53, and an exhaust flow path 54, and a spool 55 that is slidable inside the valve body 51 is operated by a bundle 56.
When operating the primary flow path 52 and the secondary flow path 53 to communicate with each other, the exhaust flow rate 54 is closed, and in the exhaust state, the pressurized air in the secondary flow path 53 is released from the exhaust flow path 54 to the outside. , the primary flow path 52 is closed at this time.

The relationship between the pressure P in the secondary flow path 53 and the exhaust time t when the exhaust valve 50 is in the exhaust state shows a steep drooping characteristic as shown in FIG. P
2 to atmospheric pressure P in a very short time.

decreases to Therefore, the exhaust valve 50 has the advantage that the exhaust time is short, but because the exhaust energy of the released air is extremely large and the amount of exhaust is also large, movable parts such as cylinders of the equipment itself that uses air pressure move rapidly. This had the disadvantage that it could collide with other equipment or the human body, causing damage.

Furthermore, as the pressurized air is rapidly exhausted, the pressurized air itself also has the disadvantage of adversely affecting other equipment.

Although not shown, in order to overcome the drawbacks of the exhaust valve 50, a spool valve is used as the exhaust valve to restrict the exhaust of pressurized air and gradually release it to the atmosphere. Although such an exhaust valve can overcome the drawbacks of the exhaust valve 50, as shown in the pressure-exhaust time characteristics in FIG. 3, it has the disadvantage that the exhaust time becomes long, reducing the efficiency of use of equipment using pneumatic pressure. Ta.

The present invention eliminates the above-mentioned drawbacks of the conventional exhaust valve, does not adversely affect other equipment, the human body, etc. when exhausting equipment using pneumatic pressure, and shortens the exhaust time.

The object of the present invention is to provide an exhaust valve device that can be used in various ways.

Referring to the drawings, the configuration which is the gist of the present invention which is a distant relative of this object is the primary flow path 2 provided in the exhaust valve body.
A fixed valve seat 4 is provided facing the primary flow path 2 at a position that partitions between the primary flow path 3 and the secondary flow path 3, and a pressing force is always applied to the fixed valve seat 4 in the closing direction to open the valve to the primary flow path 2. A poppet-shaped main valve body 5 is disposed, and an exhaust chamber 7 communicating with the secondary flow path 3 is provided at the back side of the main valve body 5. A poppet-type exhaust valve body 12 for opening and closing an exhaust hole communicating with the atmosphere is placed in the exhaust chamber 7 at a position opposite to the tip of the connecting rod 14, and is pushed in the opening direction. Pressure is applied thereto, one end is made to face the main valve body 5 from the side of the secondary side flow path 3, the other end is made to protrude outside the exhaust valve body, and the main valve body An exhaust rod 17 is provided with a relief hole 16 that is closed by contacting the valve seat 5a on the end surface, and the exhaust rod 1 is provided at the outer end of the exhaust rod 17.
7 is provided with an exhaust operation mechanism for displacing the exhaust rod 17 in the axial direction, and the relief hole 16 at the tip of the exhaust rod 17 is closed by the pushing operation of the exhaust rod 17 by the exhaust operation mechanism, the main valve body 5 is operated in the opening direction, and the connecting rod 14 The exhaust valve body 12 is pressed in the closing direction, and the main valve body 5 is closed by the pulling operation of the exhaust rod 17 by the exhaust operation mechanism, and the connecting rod 14 is separated from the exhaust valve body 12, and the relief hole 16 is opened. This exhaust valve device has the following structure: When pressurized air is supplied to the target pneumatic equipment, the exhaust valve device transfers the displacement of the exhaust operation mechanism to the main valve body and the exhaust valve body through the exhaust rod. At the same time, when the pressurized air is exhausted, the restraining force on the main valve body and the exhaust valve body is released through the exhaust operation mechanism, and the exhaust rod is separated from the main valve body, and as a first step, the exhaust rod is released from the relief hole of the exhaust rod. The pressurized air is released to the atmosphere, and in a second step, the pressure air in the secondary flow path whose pressure has been reduced to a predetermined pressure is released from the exhaust valve body side to the atmosphere.

An embodiment of the present invention will be described below with reference to FIGS. 4 and 5.

In the figure, 1 is an exhaust valve device, and a fixed valve seat 4 is formed between a primary flow path 2 and a secondary flow path 3 provided in the exhaust valve device 1.

A poppet-type main valve body 5 is provided on the primary flow path 2 side of the fixed valve seat 4.
is disposed, and a return spring 6 disposed between the main valve body 5 and the inner bottom of the valve body 1a applies a pressing force in the direction of pressing the main valve body 5 against the fixed valve seat 4 at all times.

The main valve body 5 is slidably fitted to the upper side of the exhaust chamber 7 provided in the valve box 1a, and an O-ring 8 is fitted around its outer periphery to connect the primary flow path 2 and the exhaust chamber 7. It is airtightly sealed.

An atmospheric pressure chamber 9 opened to the atmosphere through a discharge port 9a is provided further below the exhaust chamber 7, and the exhaust chamber 7 and the atmospheric pressure chamber 9 are partitioned off by an exhaust valve seat 10.

A pressure regulating screw 11 is screwed in facing the atmospheric pressure chamber 9, and a pressure spring 13 is interposed between the pressure regulating screw 11 and a poppet-type exhaust valve body 12 that opens and closes the exhaust valve seat 10. let me,
A pressing force is always applied to the exhaust valve body 12 in the opening direction.

A radial protrusion 12a is provided on the outer periphery of the exhaust valve body 12 in a protruding manner.

Inside the exhaust chamber 7 is a connecting rod 14 whose upper side is integrally fixed to the main valve body 5 and whose lower side faces the exhaust valve body 12.
are placed.

The exhaust chamber 7 communicates with the secondary flow path 3 via a communication pipe 15.

Above the main valve body 5, the lower end faces the main valve body 5 from the secondary flow path 3 side, the upper end faces the upper opening of the valve box 1a, and a small diameter relief hole 16 is bored. The exhaust rod 17 is slidably supported by the valve box 1a.

An exhaust operation mechanism 18 is provided above the exhaust rod 17.

The exhaust operation mechanism 18 includes an operation piece 2 rotatably supported via a shaft 19 attached to the upper piece 1b of the valve box 1a.
0, and an arc-shaped cam 21 formed at the lower end of the operation piece 20 is brought into sliding contact with the exhaust rod 17.

A slide body 20a is fitted to the outer circumference of the operation piece 20 so as to be slidable in the length direction thereof.
is engaged with a retaining receiving part 22 provided on the upper side of the valve case 1a, so that the operation piece 20 is fixed to the valve case 1a.

23 is a handle fixed to the end of the operating piece 20, and 24 is an O-ring fitted to the outer periphery of the exhaust rod 17.

The exhaust rod 17 is always urged toward the cam 21 by a pressed spring 25 fitted around its outer periphery, and the lower end of the exhaust rod 17 is further connected to the primary flow from the fixed valve seat 4 as shown in FIG. It is designed to protrude toward the road 2 side.

In the figure, 5a*5b are valve seats fixed to the main valve body 5, respectively.

Next, the operation of the exhaust valve device 1 having the above-described configuration will be explained.

The primary flow path 2 and the secondary flow path 3 of the exhaust valve device 1 are communicated with each other,
When pressurized air is to be sent under pressure to the pneumatic equipment connected to the secondary flow path 3 side, the operation piece 20 of the exhaust operation mechanism 18 is arranged at approximately 90 degrees with respect to the exhaust rod 17, as shown in FIG. to operate.

In this state, the maximum diameter portion 21a of the cam 21 is located at the exhaust rod 1.
It comes into contact with the upper end of 7.

Therefore, in order to push down the main valve body 5 while resisting the elasticity of the return spring 6, the exhaust rod 17 pushes down the primary flow path 2 and the secondary flow path.
It is in communication with.

Next, a case will be described in which pressurized air previously maintained at a constant pressure P2 is exhausted from the secondary flow path 3 communicating with the equipment using pneumatic pressure.

The operation piece 20 is rotated about the shaft body 19 as a fulcrum.

As the operation piece 20 rotates, the diameter of the cam surface of the cam 21 gradually decreases, and the main valve element 5 gradually rises due to the elasticity of the return spring 6 and comes into close contact with the fixed valve seat 4, forming the primary flow path 2. The secondary flow path 3 is closed.

On the other hand, since the connecting rod 14 rises together with the main valve body 5, the connecting rod 14 separates from the main valve body 5. Therefore, the force that presses the exhaust valve body 12 against the exhaust valve seat 10 is reduced by the pressure P2 in the exhaust chamber 7. and the effective pressure receiving area S of the exhaust valve body 12 P2
×S.

That is, when the main valve body 5 closes the primary flow path 2 and the secondary flow path 3, a force P2S=F toward the exhaust valve seat side is exerted on the exhaust valve body 12, and a push-up force F by the spring 13 is applied to the exhaust valve body 12. ' acts, and the exhaust valve body 12 is closed within the range where the relationship P2S>F' is established.

On the other hand, when the operating piece 20 and the exhaust rod 17 are arranged in a substantially straight line, the minimum diameter portion 21b of the cam 21 is located above the exhaust rod 17, and the exhaust rod 17 is pushed up against the cam 21 by the push-up spring 25. raised until they touch.

At this time, the main valve body 5 is already in close contact with the fixed valve seat 4, so the lower end of the exhaust rod 17 is connected to the valve seat of the main valve body 5.
5b, and the pressurized air in the secondary flow path 3 is released to the atmosphere from the relief hole 16.

Therefore, the pressure P2 in the secondary flow path 3 gradually decreases, reaching a state of pressure P1 as shown in FIG.

At this time, the pressure in the exhaust chamber 7 also becomes Pl, and the pressing force of the pressurized air against the exhaust valve body 12 becomes P1×S.

By adjusting the elastic force F' of the push-up spring 13 in advance so that PIS<F', the exhaust valve body 12 is separated from the exhaust valve seat 10, and therefore the pressure air in the secondary flow path 3 is released. is discharged all at once to the atmosphere through the exhaust chamber 7 and the atmospheric pressure chamber 9.

In other words, as is clear from the pressure-release time characteristics shown in FIG. Once the pressure drops to P1, it is rapidly discharged from the exhaust valve seat 10 to the atmosphere, and the pressure inside the secondary flow path 3 is atmospheric pressure P.

The state is equal to .

After releasing the pressurized air in the secondary flow path 3 to the atmosphere, the operating piece 20 is rotated to the state shown in FIG. 4 to return the exhaust valve device 1 to its initial state.

At this time, the exhaust rod 17 is forcibly lowered by the cam 21, and the main valve body 5 is separated from the fixed valve seat 4, thereby allowing the primary flow path 2 and the secondary flow path 3 to communicate with each other.

At the same time, the connecting rod 14 connected to the main valve body 5 brings the exhaust valve body 12 into pressure contact with the exhaust valve seat 10, and the secondary flow path 3 and the exhaust chamber 7 are cut off from the atmosphere.

In addition, in the above explanation, the pressure P□ at which pressurized air starts to be released from the exhaust chamber to the atmosphere side is the pressure P□ at which pressure air starts to be released from the exhaust chamber to the atmosphere side.
The elastic force F' of the pressing spring 13 is adjusted by adjusting the screwing position with respect to the
It goes without saying that various values can be selected by changing .

As is clear from the above explanation, the exhaust valve device of the present invention is
When pressurized air is fed to equipment using pneumatic pressure, the main valve body is opened by the exhaust operation mechanism to connect the primary flow path and the secondary flow path, and at the same time, the relief hole and exhaust gas are opened to communicate with the atmosphere. When the exhaust valve seat of the chamber is closed and pressurized air is released from the pneumatic equipment to the atmosphere, the main valve body is brought into close contact with the fixed valve seat by operating the exhaust operation mechanism, and the relief hole of the exhaust rod is closed. is communicated with the atmosphere to release the pressurized air in the secondary flow path, and at the same time release the restraint on the exhaust valve body that partitions the exhaust chamber and the atmospheric pressure chamber, which are communicated with the secondary flow path. Therefore, when the pressure in the secondary flow path has decreased to a predetermined pressure, the exhaust valve body is opened and the pressurized air can be discharged to the atmosphere at once.

Therefore, in the high pressure state of the pressurized air in the secondary flow path, IJ
It is possible to release the pressurized air to the atmosphere from the IJ-hole, and when the pressure has decreased to a predetermined level, the pressure air can be released to the atmosphere all at once, which can improve the safety and shorten the evacuation time of equipment that uses pneumatic pressure. This provides an exhaust valve device.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of a conventional exhaust valve, Fig. 2 is a graph showing the pressure-exhaust time characteristics of the exhaust valve shown in Fig. 1, and Fig. 3 is a pressure-exhaust time characteristic of another conventional exhaust valve. Graph showing the exhaust time characteristics, FIG. 4 is a cross-sectional view showing an embodiment of the exhaust valve device of the present invention, FIG. 5 is a cross-sectional view showing the same exhaust state as above, and FIG.
The figure is a graph showing the pressure-exhaust time characteristics of the exhaust valve device. 1... Exhaust valve device, 2... Primary flow path,
3...Secondary flow path, 4...Fixed valve seat, 5
・・・・・・Main valve body, 7・Bunch・Exhaust chamber, 9・・・・・・
Atmospheric pressure chamber, 10... Exhaust valve seat, 12...
・Exhaust valve body, 14... Connection rod, 16...
... Relief hole, 17 ... Exhaust rod, 18
...Exhaust operation mechanism.

Claims (1)

[Scope of utility model registration request] A fixed valve seat 4 is provided facing the primary flow path 2 at a position that partitions the primary flow path 2 and the secondary flow path 3 provided in the exhaust valve body, and the fixed valve seat 4 is always pushed in the closing direction. A poppet-shaped main valve body 5 is provided on the primary flow path side 2 to which pressure is applied, and an exhaust chamber 7 communicating with the secondary flow path 3 is provided on the back side of the main valve body 5. A connecting rod 14 protruding from the back surface of the main valve body 5 is extended into the exhaust chamber 7, and a poppet-type exhaust hole communicating with the atmosphere is provided in the exhaust chamber 7 at a position opposite to the tip of the connecting rod 14. The exhaust valve body 12 is provided with a pressing force applied in the opening direction, one end of which faces the main valve body 5 from the secondary flow path 3 side, and the other end of which protrudes outside the exhaust valve body. A relief hole 1 that is closed by contacting the valve seat 5a of the end surface of the main valve body 5 on the side end surface of the main valve body 5.
The exhaust rod 17 is provided with an exhaust rod 17 having a diameter of 6, and an exhaust operation mechanism for displacing the exhaust rod 17 in the axial direction is provided at the outer end of the exhaust rod 17.
7, the relief hole 16 at the tip is closed, the main valve body 5 is moved in the opening direction, and the exhaust valve body 12 is pushed in the closing direction by the connecting rod 14, and the tIF% rod is closed by the exhaust operation mechanism. 17, the main valve body 5 is closed, the connecting rod 14 is separated from the exhaust valve body 12, and the relief hole 16 is opened.