JP2001133301A - Air current detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reliable air current detector manufacturable at a low cost in a simple structure. SOLUTION: This detector comprises a casing 1 having a passage provided with a gas inflow pipe connection port 11 and an outflow pipe connection port 12 and formed of a conduit part 13 for carrying a gas vertically upward in use, auxiliary conduits 14 and 14' connected to the vertical conduit from upstream, and an auxiliary conduit 15 continued to the downstream of the vertical conduit, a cylinder 10 housed in the vertical conduit 13 of the casing 1 and having a plurality of gas outflow ports; and a float 2 having a permanent magnet 23 in the inner part and housed movably between the closing position of the cylinder 10 housed in the vertical conduit and the opening position thereof upper than the closing position; and a magnetic sensor 3 mounted on the outer wall bottom surface of the casing and capable of detecting the rise and fall of the float 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air flow detector capable of detecting the presence or absence of a small air flow in a pipe and having less pressure damage.

[0002]

2. Description of the Related Art Conventionally, there have been provided various detectors capable of detecting a minute airflow caused by a gas leak or the like. However, all of these detectors are complicated and expensive in structure, pressure loss of an airflow and a flange valve. There was a problem that reliability was inferior, such as an operation failure due to the inclination.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an airflow detector which can reduce pressure loss and eliminate a malfunction of a float, improve reliability, and can be manufactured at low cost.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is to provide a pipe section having a gas inlet pipe connection port and a gas outlet pipe connection port, in which gas flows vertically and upward in use.
A housing having a flow path composed of an auxiliary pipe continuous from the upstream side of the vertical pipe and an auxiliary pipe continuous from the downstream side, and a plurality of airflow outflow holes accommodated in the vertical pipe in the housing. And a cylindrical float having a permanent magnet therein, capable of closing an outlet opening of the cylindrical body, wherein the float is in contact with the cylindrical body, and an opening position above the closed position. And a magnetic sensor attached to the outer surface of the housing and capable of detecting the elevation of the float.

It is recommended that the main part of the float be container-shaped, and a reed switch can be suitably used as the magnetic sensor.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of an airflow detector according to the present invention in a state where there is no airflow.
3 is a cross-sectional view showing a state in which there is an airflow, FIG. 3 is a cross-sectional view of a housing, FIG. 4 is an enlarged cross-sectional view of a float, and FIG. As shown in FIG. 1, the airflow detector according to the present invention is roughly divided into a housing 1, a cylindrical body 10, a float 2,
And a lead switch 3.

As shown in FIG. 3, the housing 1 is provided with a connection port 11 for a gas inflow pipe and a connection port 12 for a gas outflow pipe. Road 1
3 and the associated conduits 14, 14 ', 15 are formed. When using this airflow detector, it is installed so that the vertical pipe is vertical. In the illustrated embodiment, the float 2 is formed to move up and down inside the cylindrical body 10 housed in the vertical pipe 13.

As shown in FIGS. 1 and 4, the float 2 includes a cylindrical main body 2 and a permanent magnet 23 housed therein. The outer diameter of the float is set to be slightly smaller than the cylindrical body 10 housed in the vertical conduit, so that the float 2 can freely move up and down inside the cylindrical body. Therefore, when the float 2 is at the lowered position (closed position) as shown in FIG.
At the same time the storage unit lands, close the side opening of the cylinder,
On the other hand, when the float 2 is at the ascending position (opening position) as shown in FIG. 2, the float 2 is separated from the outlet of the cylindrical body. The main body is formed in a cylindrical shape as shown.

The magnetic sensor 3 is mounted on the outer surface of the housing 1 and is turned on / off by the magnetic force of the permanent magnet 23 housed in the float 2 so as to be able to detect the elevation of the float 2. .

Next, the operation of the airflow detector will be described. When gas is not flowing from the gas inlet pipe connection port 11, the float 2 descends by its own weight and the side surface of the float 2 Is closed, and at this time, the reed switch 3 is turned ON by the magnetic force of the permanent magnet 23 in the float 2. On the other hand, inflow pipe connection □ 1
When the gas flows from 1 through the attachment pipes 14 and 14 ', the float 2 is lifted by the gas pressure to be in a state as shown in FIG. 2, the side surface of the float 2 is separated from the opening of the cylindrical body 10, and the gas flowing in Open the cylinder as indicated by the arrow.
From the outlet through the vertical pipe line 13 to the attachment pipe portion 15 and out of the outlet pipe connection port 12. At this time, the reed switch 3
Turns off because the float 2 rises and the permanent magnet 23 moves away from the reed switch 3. Therefore, in the case where the reed switch 3 is in the OFF state even though the gas is not used on the gas consuming side,
This indicates that an airflow is generated in the pipe due to gas leakage or the like. Therefore, if an alarm is issued in such a case, the presence or absence of gas leakage or the like can be easily detected.

The airflow detector is used, for example, for monitoring a kitchen gas appliance in a dwelling for the elderly, and by monitoring whether or not the kitchen gas appliance is properly used in a timely manner, the safety of the resident can be checked. And so on. The main body of the float 2 is formed in a cylindrical shape as shown in the figure, so that the float 2 can move from the opening position in FIG.
When returning to the closed position, the inner wall surface of the cylindrical body 10 in the vertical pipe 13 can be returned without resistance, so that the float 2 can be reliably moved up and down, and the responsiveness and reliability with respect to the presence or absence of airflow can be improved. Is improved.

[0012]

Since the present invention is configured as described above, according to the present invention, it is possible to provide an airflow detector which has a simple structure, is more reliable, and can be manufactured at low cost.

It should be noted that the present invention is not limited to the above-described embodiment, and is not limited to the detection of gas leakage in the application.
A variety of uses are possible, and the invention therefore encompasses all modifications within the scope thereof that would be readily apparent to one skilled in the art from the foregoing description.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an airflow detector according to the present invention in a state where there is no airflow.

FIG. 2 is a cross-sectional view showing a state in which there is an airflow.

FIG. 3 is a sectional view of a housing.

FIG. 4 is an enlarged sectional view of a float.

FIG. 5 is an enlarged sectional view of a cylindrical body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Float 3 Reed switch 10 Cylindrical body 13 Vertical pipeline 23 Permanent magnet

Claims (3)

[Claims] 1. A pipe section (13) in which a gas inflow pipe connection port (11) and an outflow pipe connection port (12) are provided. A housing (1) having a flow path consisting of an auxiliary pipe (14, 14 ') continuous from the upstream side to the road and an auxiliary pipe (15) continuous downstream of the vertical pipe; Vertical pipeline (1
3) A cylindrical body (1) having a plurality of airflow outflow holes housed therein.
0) and a cylindrical float (2) capable of closing a side opening of the cylindrical body, having a permanent magnet (23) therein, and the float being provided in the cylindrical body with an outlet hole of the cylindrical body. A float (2) housed movably between a closing position in contact with the opening and an opening position above the closing position, and a magnetic sensor attached to the outer surface of the housing and capable of detecting the elevation of the float (3) An airflow detector comprising: 2. The airflow detector according to claim 1, wherein the housing has a plurality of airflow outflow holes on a side surface thereof. 3. An airflow detector according to claim 1, wherein said magnetic sensor is a reed switch.