JP2586962Y2 - Water sensor - Google Patents

Description

[Detailed description of the invention]

[0001]

Industrial Applicability The present invention relates to water discharge, particularly in the case of sprinkler fire extinguishing equipment,
The present invention relates to a sensor that, when a water leak occurs, detects it quickly and issues an alarm.

[0002]

2. Description of the Related Art In a sprinkler fire extinguishing system, when a fire occurs, a sprinkler head mounted on a ceiling surface operates at an abnormally high temperature of the fire and automatically extinguishes water to extinguish the fire. .

A sprinkler fire extinguishing system is excellent in that a sprinkler head extinguishes a fire automatically. However, since water continues to be released even after the fire is extinguished, the water is transmitted downstairs where no fire has occurred. Or water flowing into an adjacent room, causing a computer, facsimile, office machine such as a copy, furnishing furniture, or important documents to be placed there, causing a water damage accident. .

[0004] Further, since today's buildings use many new building materials made of chemical materials, a large amount of toxic smoke is generated in the early stage of a fire even if the fire is extinguished by a sprinkler head. This toxic smoke is dangerous because the fire can be fatal despite its small scale.

For this reason, when a fire has hitherto occurred and water has been sprayed from the sprinkler head, the occurrence of the fire is notified, and after the fire has been extinguished, the discharge of water is stopped immediately to reduce water damage as much as possible. In order to protect themselves from the toxic gas generated from refugees, warnings for evacuation guidance were issued. As means for detecting water sprinkling from the sprinkler head, a water sensor is installed near the sprinkler head, and an alarm is issued when the water released from the sprinkler head wets this water sensor. It is.

[0006] A conventional water sensor is disclosed in
No. 3,699, and JP-A-3-41974, a pair of metal electrodes are installed separately from each other, and when water straddles and adheres between the electrodes, the electrodes are in an energized state. And issued an alarm.

[0007]

However, the sprinkler head may cause water to flow out even if a fire does not occur. For example, when a person holding a long object passes under the ceiling to which the sprinkler head is attached, the tip of the long object hits the sprinkler head and deforms the sprinkler head frame or disassembled portion. The sprinkler head may not drain the water immediately, but after a while the valve that shuts off the water may loosen and allow the water to flow out little by little.

In such a case, in the conventional water sensor installed near the sprinkler head, the distance between the pair of electrodes is large, so that if there is no momentum in the water, water droplets will only adhere to one of the electrodes. It does not wet over the electrodes. Therefore, the conventional water sensor can detect water only when the sprinkler head operates and releases a large amount of water in the event of a fire, but cannot detect small amounts of water like water leakage. It lasted for a long time, causing water damage. An object of the present invention is to provide a water sensor with excellent sensitivity, which can detect even a small amount of water adhered to even a single drop of water.

[0009]

Means for Solving the Problems The present inventor has found that when water hits an object, it flows downward along the object and that water has surface tension and adheres over a small gap. The present invention was completed by focusing on the fact that there is.

In the present invention, the metal internal electrode is rod-shaped, and the upper portion of the internal electrode is covered with an insulator, and a metal external electrode is provided below the insulator on the outside of the insulator.
Are also set to protrude, and external electrodes
A water sensing sensor characterized by being mounted vertically with its protruding part downward .

In the present invention, the cross section of the metal internal electrode may be a square, a polygon, a circle, or the like, as long as the internal electrode is a rod.
If the cross section is a round bar, the directionality is lost, so that water scattered from any direction can be adhered in the same state. The metal external electrode installed outside the insulator may be of any shape.However, when a round bar is used for the internal electrode, the cylindrical shape has a constant separation distance from the internal electrode, and the cross-linking state of water is reduced. It is appropriate because it can be performed well.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway perspective view of the water sensor of the present invention, FIG. 2 is a front cross-sectional view illustrating the operation state of the water sensor of the present invention, and FIG. 3 is attached to the sprinkler head of the present invention. It is a figure explaining the state which detects outflow of water.

The water sensor 1 includes an internal electrode 2, an insulator 3, and an external electrode 4. The internal electrode has a long rod shape, and an insulator 3 is provided around the internal electrode in a state where a lower portion of the internal electrode is projected. An external electrode 4 is provided outside the insulator. The distance between the internal electrode 2 and the external electrode 4 is such that even a drop of water can be crosslinked by its surface tension. Conductive wires 5 and 6 are connected to the internal electrode and the external electrode, respectively. These wires are connected to a control panel (not shown), and an alarm is issued from the control panel when the water sensing device detects the outflow of water.

The water detecting sensor of the present invention is installed near the sprinkler head and has a primary purpose of detecting flowing water from the sprinkler head. When the sealing plate 7 is incorporated into the sealing plate 7 as shown in FIG. 3, the water detection sensor can be attached when the sealing plate is attached after the sprinkler head 8 is attached, thereby facilitating construction.

Next, the operation of the water sensor of the present invention will be described. When a fire occurs and the sprinkler head operates, the water discharged from the sprinkler head impinges on the water sensor 1 mounted near the sprinkler head 8 as shown in FIG. A large amount of water hits the water sensor due to the vigorous flow of water from the sprinkler head that was activated in a fire, and the outer and inner electrodes were wet with a large amount of water, completely bridging between these electrodes. I will be.

Therefore, in the event of a fire, it is extremely easy to detect the water discharge from the sprinkler head, and an alarm for the fire is issued. People who learned of the fire from this warning,
Start evacuation immediately to avoid accidents due to smoke, and if the fire is extinguished by watering the sprinkler head, stop the water source pump to prevent water damage caused by overspraying be able to.

Even when a small amount of water flows out of the sprinkler head due to an external impact instead of a fire, the water sensor of the present invention can sufficiently detect the water.
If even a small amount of water, for example, a drop of water, adheres to the external electrode on the water sensor of the present invention, when it hangs down and moves to the internal electrode, it is bridged between the external electrode and the internal electrode, and the external electrode and the internal electrode are electrically connected. To Therefore, the water sensor according to the present invention can detect even a small amount of water flowing out of the sprinkler head due to an external impact, so that water loss due to long-time water flowing out is eliminated.

Although the present invention has been described in connection with the detection of running water by being mounted near the sprinkler head, the present invention is applicable to any place where it is necessary to detect running water and issue an alarm. Needless to say.

[0019]

As described above, the water sensing sensor of the present invention has a structure in which the lower portion of the rod-shaped internal electrode is elongated, and the external electrode is provided above the outside of the rod through an insulator, so that a small amount of water adheres. Even in this case, water can always be bridged between the external electrode and the internal electrode to make it conductive. Therefore, the water detecting sensor of the present invention has an excellent effect that even if the sprinkler head receives an external impact, it is immediately notified of it and does not cause water damage.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a water sensor of the present invention.

FIG. 2 is a front sectional view illustrating an operation state of the water sensor according to the present invention;

FIG. 3 is a view illustrating a state in which the water detection sensor of the present invention is attached to a sprinkler head to detect outflow of water.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water sensor 2 Internal electrode 3 Insulator 4 External electrode 5 and 6 conductor 7 Sealing plate 8 Sprinkler head

Claims (3)

(57) [Scope of request for utility model registration] An internal electrode made of metal has a rod shape, an upper portion of which is covered with an insulator, and an external electrode made of metal has a lower portion protruding below the insulator outside the insulator.
And the external electrodes protrude.
A water sensor that is mounted vertically with its part down . 2. The water sensor according to claim 1, wherein the internal electrode is a round bar. 3. The water sensor according to claim 1, wherein the external electrode has a cylindrical shape.