JPS61104285A - Liquid droplet sensor - Google Patents

Abstract

PURPOSE:To detect a liquid droplet under a pressure resistant air-tight state, by connecting a dripping nozzle and a conduit in an air-tight state by a transparent pipe and providing a pair of transmission type photoelectric detectors opposed in a state crossing the falling orbit of the liquid droplet at right angles. CONSTITUTION:A dripping nozzle 1 and a conduit 2 for guiding a liquid droplet of an odorant from the nozzle 1 to a gas pipe 6 are connected by a transparent pipe 3 and a pair of photoelectric detectors 4a, 4b are provided to the outer periphery of the transparent tube 3. The nozzle 1, the conduit 2, the transparent pipe 3 and the detectors 4a, 4b are received in a case 5 having an air-tight structure. The liquid droplet of the odorant blocks the light between the detectors 4a, 4b when passes through the transparent pipe 3 in a route and the detectors 4a, 4b are operated by said light blocking action to detect the liquid droplet.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION Technical Field of the Invention The present invention relates to a droplet sensor for detecting droplets.

(Conventional technology and its problems) Conventionally, most city gas has been added with an odorant consisting of an organic sulfur-based volatile liquid substance during production to intensify the odor so that gas leaks can be detected quickly. There is. The odorant has an extremely strong odor, and the amount added is extremely small. To give a specific figure for the amount added, the odorant is added at a rate of 0.003 m/0 to the gas INi by dropping the odorant into the gas pipe from a dripping nozzle).
However, since the amount of gas produced changes stepwise several times a day depending on the amount consumed, the amount of odorant added must be adjusted accordingly.

Conventionally, the amount of odorant added is adjusted by measuring the flow rate of the odorant to the dripping nozzle with a 70-meter meter, and adjusting the opening of the flow rate control valve based on the measured value. In such conventional methods, the flow rate of the odorant is extremely small, so it is difficult to accurately measure the flow rate with a flow meter, resulting in large measurement errors and difficulty in accurately controlling the flow rate. Met.

Therefore, as a means for accurately measuring the flow rate of the odorant, the applicant of the present invention has devised the following measuring means. That is, the volume of the droplets dripping from the dripping nozzle is calculated in advance, the dropping of the droplets is detected, the number of droplets per unit time is measured, and the central processing unit is used to add odor. This calculates the flow rate of the agent. When employing a measuring means such as nitrous, the detection of odorant droplets must be carried out under pressure-tight and airtight conditions. The reason for this is that city gas flows through gas pipes under pressure, and the odorant is added to it.

(Technical Problem to be Solved by the Invention) A technical problem to be solved by the present invention is to enable droplets to be detected under pressure-tight airtight conditions.

"Structure of the Invention" (Technical!!Technical means for solving the problem) The technical means taken by the present invention to solve the above problem is to make the drip nozzle and the conduit that guides the droplets from the nozzle transparent. A pair of transparent tubes are airtightly connected by a tube, and a pair of photoelectric detectors are installed on the outer periphery of the transparent tube, facing each other perpendicularly to the falling locus line of the droplet from the dripping nozzle. ) According to the above means, the droplet passes through a thread path that maintains airtightness that connects the dripping nozzle to the transparent tube and the conduit, and the droplet passes through the transparent tube when passing through the transparent tube, between the transmission type photoelectric detectors. The light source is blocked, and the detector detects the droplet by its light blocking effect.

[Effect of the Invention j] According to the configuration of the present invention as described above, droplets can be detected in a pressure-tight airtight state.

"Example" Embodiments of the present invention will be described below with reference to the drawings.

The droplet sensor of this example detects droplets of an odorant made of an organic ionic volatile liquid substance added to city gas. A dropping nozzle (1) and a pair of photoelectric detectors (4a) (4b, 1) are provided at the outer station of the nozzle transparent tube (3), and the dropping nozzle (1) and the conduit (2) are provided.

Transparent'# (3) Andhiko IE test B child (4aX4.b
) It is housed in a case (5) with a t% dense structure.

The dripping nozzle (1) is made of stainless steel so as not to be attacked by the odorant, and is inserted into the case (7) through the bar 7 unit (7 m) in an airtight manner from the upper wall thereof.

Guide! (2) is made of stainless steel like the dripping nozzle α), and its upper end is inserted into the case (5) through the half union (71) in an airtight manner through the bottom wall thereof.

The transparent tube 0) is made of pressure-resistant tempered glass so that it will not be attacked by odorants, can withstand connection with the dripping nozzle (1) and the conduit (2), and can be used under pressures higher than atmospheric pressure. The drip nozzle (1) and the guide if' (2) also have large diameters. The connection structure between the transparent tube (3), the drip nozzle (1), and the guide IF (2) is such that the lid body ( 9a
) (9b) in an airtight manner, and the lid body (9 &) (9b)
II! Connect with the connecting bolt (to) in the textbook and attach the half uni # to the upper lid (9a) (7Q)
Insert the dripping nozzle (1) through the IC in an airtight manner and into the transparent tube (3), while inserting the lower lid (9b) into the IC
The tubes (8a) and (8b), in which the conduit (2) is airtightly inserted through the half union (7a) and communicated with the transparent tube (3), are coated with Teflon to prevent them from being attacked by the odorant. It is said to be made of resin.

The charged detectors (4&) (4b) on the outer periphery of the transparent tube (3) are of a transmission type, in which the light emitted from one side to the other passes through the transparent tube (3), and is made of polycarbonate optical fiber. Consisting of shi, half union (7@)
is inserted into the case (5) through the side wall of the case (5) in an airtight manner, and is disposed so as to face perpendicularly to the falling locus line of the odorant droplets passing through the transparent tube (3), It is connected to a charging switch (not shown).

The case (5) has a removable lid (5&) bolted to the front opening of the case (5) via a Teflon resin sealing member (b). The sensor can be maintained.◎ The droplet sensor of this embodiment as described above has a droplet nozzle (1
) to the transparent tube (3) and the conduit (2) maintain airtightness, and when the droplets of odorant pass through the transparent tube (3) in the yarn path, a photoelectric detector (4a) (4b) blocks the light between the photodetectors (4a) and (4) due to its blocking effect.
) is activated to detect droplets. That is, the droplets of the odorant are detected in an airtight condition where they are isolated from the atmosphere, and a photoelectric detector (4
x) (4b) will not be attacked by odorants, and the function of the photoelectric detector (4&) (411") can be maintained well. Also, in the unlikely event that the transparent tube (3) is damaged or the conduit (3) Even if the sealing performance at the connection between the dripping nozzle (υ) and the conduit (2) is impaired, the leaked odorant will remain within the airtight case (5) and will not leak into the atmosphere. It has excellent safety.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the droplet sensor of the present invention, and FIG. 2 is a sectional view taken along the line a[)--b in FIG. 1. Also in the diagram

Claims (1)

[Claims] A dripping nozzle and a conduit that guides droplets from the nozzle are connected in an airtight manner by a transparent tube, and a pair of tubes are provided on the outer periphery of the transparent tube, facing each other perpendicularly to the line of fall of the droplet from the dripping nozzle. Droplet sensor equipped with a transmission type photoelectric detector.