JPS6223835B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pneumatic detector that has a simple structure and is easy to assemble.

Conventionally, this type of pneumatic detector was
A detector shown in Japanese Patent No.-54364 is known. When the detection nozzle 2 installed close to the flapper 1 is located at a remote position from the air source 4 as shown in FIG. It is intended to take out pressure, and by providing the outlet 5 between double orifices 6 with different hole diameters, extremely sensitive detection is possible. Further, if such a configuration is adopted, even when the nozzle back pressure becomes negative pressure, it has excellent features such as being able to detect a negative range based on the principle of spraying.

However, since the double orifice 6 is provided on the inner wall of the pipe, it is troublesome to manufacture, difficult to achieve dimensional accuracy of the orifice diameter, and manufacturing costs are high.

The present invention has been made in view of the above-mentioned points, and consists of two orifices having different hole diameters.
The present invention provides a pneumatic detector which is easy to manufacture and assemble and can reduce manufacturing costs due to its extremely simple structure of stacking two thin plates with a gasket interposed therebetween.

The present invention will be explained in detail below based on embodiments shown in the drawings.

FIG. 2 is a longitudinal sectional view showing an embodiment of the pneumatic detector according to the present invention, and FIG. 3 is an exploded perspective view of the same detector. In these figures, reference numerals 10 and 11 are hexagonal first and second thin plates each having a thickness of approximately 0.2 mm, each having an orifice 1 in its center.
2 and 13 are provided. The orifice 12 of the first thin plate 10 is connected to a detection nozzle,
The hole diameter is set to, for example, 0.6 mmφ. on the other hand,
The orifice 13 of the second thin plate 11 is connected to an air source, and has a hole diameter set to, for example, 0.25 mmφ. Furthermore, pressure outlet ports 14 are provided at appropriate locations on the first thin plate 10 so as to penetrate therethrough. The first and second thin plates 10 and 11 are
0 and 11, with a gasket 16 having a long hole 15 formed in the center interposed therebetween, and after aligning the centers of the orifices 12 and 13, they are integrally connected by a mounting bolt (not shown). Detector 20 is configured. The inside of the detector 20, that is, the space surrounded by the first and second thin plates 10, 11 and the gasket 16 forms a sealed cavity 21. Note that 17, 18, and 19 are bolt insertion holes.

In FIG. 4, the above-mentioned detector 20 is interposed between a pair of air pipe extraction plates 22 and 23 to form a thin single device. In this case, orifice 1
One end of a pipe 24 is connected to the air pipe outlet plate 22 on the second side, and the other end is connected to the detection nozzle 2. Further, a connection plug 25 is connected to the air pipe outlet plate 22 in correspondence with the pressure outlet 14.
On the other hand, air at a predetermined pressure is supplied to the orifice 13 from an air source (not shown).

In such a configuration, the air source pressure should be 1.4
When set at Kg/ ^cm2 , a vacuum pressure of -105 mmHg was obtained. Also, the orifice diameter of the first thin plate 10 is
When the diameter was set to 0.8 mmφ and the other conditions were the same as above, −30 mmHg was obtained.

The detector 20 according to the present invention can be easily installed not only as a single device as shown in FIG. 4, but also in a known pneumatic device, and as shown in FIG. It is also possible to connect and incorporate it into a pilot valve.

In addition, to roughly explain the configuration of FIG. 5,
Reference numeral 30 denotes a main body constituting the amplifier A. Air from an air source is guided to the orifice 13 through a passage 31 provided in the main body 30, and the air that has passed through the orifice 13 is further guided to the orifice 12. and is guided to a detection nozzle (not shown). Two chambers 33 and 34 are provided within the main body 30 and are partitioned by a partition wall 32, and the lower chamber 33 is constantly supplied with air from the air source. The partition wall 32 has a through hole 3
5 is provided, and a valve 36 is provided passing through this through hole 35. The valve 36 is always urged upward in the figure by a spring 37, so that it normally closes the through hole 35 and at the same time closes the upper chamber 34.
The passage 39 of the member 38 provided therein is closed.
The member 38 is supported by two diaphragms, and the passage 39 passes between these diaphragms and communicates with the outside via an exhaust hole 40 provided in the main body 30. The pressure outlet 14 of the detector 20 (in this case provided in the second thin plate 11) communicates with the upper chamber 34, in particular with the uppermost compartment separated by the diaphragm. Therefore, for example, the nozzle back pressure increases,
When the valve 36 is moved in the opening direction by the member 38 being pushed down, supply air Psup corresponding to the nozzle back pressure is taken out from the chamber 34 as an output Pout.

As explained above, since the pneumatic detector according to the present invention is composed of two thin plates and a gasket, it has an extremely simple structure, and is easy to manufacture and assemble. In addition, the orifice can be easily processed and high accuracy can be achieved. It is possible to reduce manufacturing costs. In addition, it is easy to combine with other members and a highly accurate detector can be obtained, so the effects are very large.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of a conventional pneumatic detector, Fig. 2 is a longitudinal sectional view showing an embodiment of the pneumatic detector according to the present invention, and Fig. 3 is an exploded perspective view of the same detector. , FIG. 4 is a longitudinal sectional view of a single device incorporating a detector, and FIG. 5 is a longitudinal sectional view of a pneumatic amplifier incorporating a detector according to the present invention. 10...first thin plate, 11...second thin plate, 1
2, 13... Orifice, 14... Pressure outlet,
16... Gasket, 20... Detector, 21...
Sealed vacancy.

Claims (1)

[Claims] 1. A first thin plate having an orifice with a large hole diameter and a second thin plate having an orifice with a small hole diameter are superimposed with a gasket interposed therebetween so that the centers of the two orifices coincide, and
A pneumatic detector characterized in that a space surrounded by a thin plate and a gasket is a sealed chamber, and a pressure outlet communicating with the sealed chamber is provided in the first or second thin plate.