JPS5854705Y2 - gas detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas detector, and particularly to a detection liquid outflow prevention device.

Conventionally, one end of the primary side pipe is inserted into the liquid to generate air bubbles, and the air bubbles are collected in the space above the liquid level and fed through the secondary side pipe to prevent the generation of air bubbles. It is a common practice to confirm the presence of gas flow within a pipe by observing its presence or absence, as it is simple and reliable.

For example, Fig. 1 shows an example of a known gas detection system, in which a detection liquid B is placed in a transparent case A, and a top cover E having an inlet C and an outlet is fitted over this, and the inlet Connect the primary side pipe F to C and the secondary side pipe G to the outlet, and connect a pipe H from the suction port C to the inside of case A, and put the other end of this pipe H into the liquid. The gas supplied from the primary pipe F passes through the suction port C and the pipe H, and is released as bubbles from the tip of the pipe H, which fills the space above the liquid level. , has the effect of being sequentially fed from the outlet to the secondary pipe G, and the presence or absence of gas bubbles is used to determine whether or not there is a gas flow.

In such a gas detector, when the gas flow rate is low, small bubbles are generated, and as the flow rate increases, large bubbles are generated.

If the amount of gas flowing through the detector is excessive, for example, if the primary valve is opened with the secondary hose or valve disconnected or broken, a large amount of large air bubbles will be generated. The liquid level becomes like boiling water, and droplets of the detection liquid flow out into the secondary pipe G through the outlet port along with the airflow.

If the detection liquid leaks out in this way, the detection liquid will flow into the valves, regulators, etc. installed in the middle of the secondary pipe, or into the equipment used, leading to deterioration or reduced performance of these equipment. Not only that, gas detectors have to frequently replenish the detection liquid because the detection liquid becomes extremely low and the tip of the pipe protrudes above the liquid level, causing it to lose its detection function. There was a problem.

The present invention has been devised for the purpose of providing a gas detector free from the above-mentioned drawbacks, and the features of the present invention will be explained in detail below with reference to the drawings.

In the figure, 4 is a lid, which has a suction port 5 that opens laterally and a delivery lower.

The suction port 5 communicates with the back surface through a hole 6 provided on the bottom surface of the lid 4, and the delivery lower also communicates with the bottom surface through a hole 8 and an adjustment hole 10.

This adjustment hole 10 consists of a cylindrical fitting part 10b open toward the lower surface, and a conical taper part 10a above which the diameter gradually decreases.

Note that several grooves 9 are provided on the wall surface of the tapered portion 10a in the same direction as the direction of inclination thereof.

Reference numeral 2 denotes a support container, which is formed by spirally winding steel wire or the like into a so-called conical shape with a small diameter at the bottom. A spherical floating body 1 is inserted into this, and the upper part of the support container 2 is Adjustment hole 1
By fitting into the fitting hole 10b of No. 0, an adjusting portion is formed by these, the tapered portion 10a, and the groove 9.

A pipe 3 has a thread 3a at its upper end, and is screwed into a thread 11 provided on the inner periphery of the hole 6 of the lid 4.

In this way, the support container 2 and the lid 4 with the pipe 3 attached thereto.
A gas detector is formed by fixing the O-ring 40 and the case 20 to the support frame 30.

That is, the case 20 has a bottomed cylindrical shape with a transparent side surface 21, and has a flange 22 projecting in the circumferential direction at its upper end. Fit the lid 4 with the attached support frame 3 from below.
0 and protrudes inwardly from this support frame 30.
The lower part of the flange 22 of the case 20 is supported, and the thread 31 provided on the inner peripheral surface of the side of the support frame is screwed into the thread 13 provided on the side surface of the lid 4. Then, press the lid 4 and case 20 together to assemble the gas detector.

The detection liquid 23 is either sealed in the case 20 before assembling the detector, or inserted into the inlet (not shown) provided in the lid 4 after assembly.
Inject more.

In addition, the pipe 3, the case 20, the lid 4, and the support frame 30
can be formed into various shapes such as a rectangular cross section other than the circular cross section shown in the figure, and each member can be attached by various methods such as adhesion and welding other than screwing.

The support container 2 can be formed by winding a wire made of synthetic resin in a spiral shape, or in a net shape, in addition to being formed by winding a steel wire in a spiral shape as described above. Any material may be used as long as it has a passable portion and can hold the floating body 1.

Furthermore, the case 20 does not need to be entirely transparent as long as it has a structure that allows the detection liquid to be observed.

In the above embodiment, the tapered part 10a has a conical shape, but it is not limited to a conical shape, and can be formed in a shape other than a spherical shape, a pyramid shape, or a circular cross section.
Also, various changes can be made depending on the shape of the tapered portion.

Furthermore, the fitting part 10b can also be formed in various shapes other than a cylindrical shape depending on the various shapes in which the support container 2 is formed, such as a square or triangular cross section. For example, this can be omitted when the cover 4,000 around the adjustment hole 10 is attached by adhesive or the like.

In addition to being provided in the same direction as the inclination direction of the wall surface of the tapered portion 10a, the groove 9 can also be formed in a spiral shape.

The gas detector configured as described above exhibits the following effects.

That is, if the amount of gas flowing through the detector is moderate, the third
As shown in the figure, the gas supplied from the inlet 11 passes through the hole 6 and the pipe 3 and enters the detection liquid 23 with bubbles 24.
released as.

This bubble 24 rises in the detection liquid 23 and fills the space 25 above the liquid level, and then fills the space 25 in the support container 2, the adjustment hole 10,
It passes through the hole 8 and is supplied to the secondary side via the delivery lower.

However, if the amount of gas flowing through the detection liquid is too large, for example if the secondary hose or valve is disconnected or broken and the primary valve is opened, large bubbles will be generated and The internal pressure in the space 25 above the liquid level increases.

At that time, as shown in FIG. 4, the floating body 1 passes through the gap in the support container 2, is pushed upward by the airflow flowing through the adjustment hole 10, and comes into contact with the tapered portion 10a.

Therefore, the adjustment hole 10 is closed to prevent excessive gas from flowing and to prevent the liquid level from boiling due to the generation of large bubbles, so that the detection liquid 23 is not splashed and the detection liquid 23 can be prevented from flowing out to the secondary side.

At this time, the floating body 1 contacts the tapered part 10a and closes the adjustment hole 10, but since several grooves 9 are provided in the axial direction on the wall surface of the tapered part 10a, this part The space 25 above the liquid level and the delivery lower are communicated through the groove 9, which is not closed, and an appropriate amount of gas is delivered to the secondary side, so that the function as a detector can be maintained.

An example of the use of the above-mentioned gas detector is shown in Fig. 5. The figure shows an example in which it is used as a gas leak detector, and 51 is a cylinder filled with flammable gas such as propane. The gas is led to a main pipe 53 through a branch pipe 52 connected to the main pipe 53, passes through a regulator 54, passes through an opened main valve 55, and is led to a gas appliance 56.

At this time, the bypass valve 57, which is formed integrally with or separately from the gas detector 50, is closed.

To test for gas leaks from any of the gas appliances 56 that are not in use, first close the main valve 55 and then open the bypass valve 57.

If a gas leak occurs in any of the gas appliances 56, gas flows through the bypass 58, bubbles are generated in the gas detector 50, and the gas leak can be detected.

When no gas leak occurs, no gas flows through the bypass 58 and the gas detector 50, and therefore no bubbles are generated, confirming that there is no gas leak.

In this way, by placing the gas detector in front of the gas appliance, it is possible to inspect the presence or absence of gas leakage in the gas appliance. Inspect for leaks in gas appliances immediately after the cylinder outlet 59 and immediately before the gas appliance 6
By arranging one unit at each location, it is possible to independently test for leaks in piping and gas appliances.

In this case, in the gas detector according to the present invention, even if an excessive amount of gas tries to flow into the gas detector, for example, when a connection hose to a gas appliance is disconnected, the detection liquid will not flow out.

Furthermore, this makes it possible to omit the main valve 55 and the bypass valve 57 and to dispose the gas detector directly in the middle of the main pipe 53.

As described above, the gas detector according to the present invention can prevent an excessive amount of gas from flowing, and therefore can prevent the detection liquid 23 from flowing out to the secondary side. It does not cause deterioration or deterioration of performance of installed valves, regulators, etc. or the equipment used, and the detection liquid becomes extremely low and the tip of the pipe protrudes above the liquid level and loses its function as a detector. There is no need to replenish the detection liquid.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional gas detector, FIG. 2 is a partially cutaway perspective view showing an embodiment of the gas detector of the present invention, and FIG.
4 and 4 are sectional views showing the operating state of the gas detector of the present invention, respectively, and FIG. 5 is a block diagram showing an example of its use. 1...Floating body, 2...Support container, 3...
... Pipe, 4 ... Lid, 5 ... Intake port, 7 ... Outlet port, 9 ... Concave groove, 1
0...adjustment hole, 10 a...tapered part, 10 b...fitting part, 20...case, 23...detection liquid .

Claims (1)

[Scope of utility model registration request] a case 20 that encloses a detection liquid 23 and whose interior can be observed;
A gas detector consisting of a lid 4 attached to the lid 4, an inlet 5 and a delivery lower provided on the lid 4, and a pipe 3 attached to the intake port 5 with its lower end buried in the detection liquid 23. An adjustment hole 10 that communicates with the lower part and is open on the lower surface of the lid 4 is provided, and a groove 9 is formed on the circumferential surface of the adjustment hole 10.
1. A gas detector characterized in that a floating body 1 is inserted and a support container 2 having an air flow portion is attached to the adjustment hole 10.