JPH0644473A - Fire sensor - Google Patents

Abstract

PURPOSE:To provide a fire sensor capable of easily and remotely performing a performance test by magnetizing the electrode component of a fixed contact point, drawing a movable contact point and closing the contact point. CONSTITUTION:A coil 12 for magnetizing the electrode component at the time of applying a test voltage is provided on the electrode component 10 of the contact point 5 opposed to the movable contanct point 4. At the time of performing the test, the electrode component 10 is magnetized and the movable contact point 4 is closed. The material of a spring component 9 on which the electrode component 10 and the movable contact point 4 are provided is paramagnteic material.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a fire detector having a remote test function.

[0002]

2. Description of the Related Art Conventionally, constant temperature type and differential type heat sensors have
The thing which sends out a fire signal by the substantially short circuit by the contact of the movable contact which displaces at the time of heat sensitivity, and the fixed contact which opposes the movable contact is used. For example, when a differential type sensor receives heat of a rapid temperature rise due to a fire, air in an air chamber equipped with a leak valve expands to press a diaphragm to close a contact point and give a fire alarm. The operation test of such a sensor is performed by actually applying heat with a heating tester or directly injecting a small amount of air into the air chamber.

[0003]

However, all of the above-mentioned test methods have a drawback that they need to be operated at the place where the sensor is attached, which requires time and labor.

[0004]

DISCLOSURE OF THE INVENTION In view of the above points, the present invention is directed to a fire detection system in which an operation test can be remotely performed more easily by magnetizing an electrode member and attracting a movable contact. To provide a container.

Therefore, according to the present invention, the electrode member of the contact facing the movable contact is provided with magnetizing means for magnetizing the electrode member when a test voltage is applied, and the electrode member is magnetized to operate the movable contact when the magnetizing means operates. It is characterized by being closed.

[0006]

The contact can be easily closed by magnetizing the electrode member facing the movable contact and pulling the spring member of the movable contact. In this test method, since heat or the like is not actually applied to the sensor, it does not cause stains or deformation and cause deterioration.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fire detector according to the present invention will be described below with reference to the drawings.

First, referring to FIG. 1, a differential type heat sensor will be described. The main body P of the sensor is composed of an air chamber 1 and a base 2, a diaphragm 3 is provided in the center of the air chamber 1 inside the sensor main body P, and the vicinity thereof is expanded by a change in temperature environment (not shown). A leak hole is provided to allow air to escape. Then, in the event of a fire, due to a rapid temperature rise, the air in the air chamber 1 expands and pushes up the diaphragm 3, bringing the movable contact 4 into contact with the fixed contact 5 and sending out a fire signal.

In the air chamber 1, an inner frame 6 which constitutes an upper frame body and an outer frame 7 which constitutes a lower frame body are combined by caulking, and they are fitted and engaged with a peripheral wall 8 of a base 2. ing. A diaphragm 3 sealed with solder or the like is provided in the center portion of the inner frame 6 of the air chamber 1, and the spring plate 9
Is in contact with the central portion of the diaphragm 3.

The spring plate 9 is made of paramagnetic material such as iron, the movable contact 4 is provided on the spring plate 9, and the fixed contact 5 is arranged above the movable contact 4 with a predetermined gap. Fixed contact 5
Like the spring plate 9, the contact plate 10 provided with is formed of paramagnetic material such as iron, is in contact with the tip of the adjusting screw 11, is positioned, and the sensitivity is adjusted by the adjusting screw 11. A magnetizing coil 12 is provided on the contact plate 10 and is arranged so as not to interfere with the contact plate 10.

The spring plate 9 provided with the movable contact 4 and the contact plate 10 provided with the fixed contact 5 are fixed to the base 2 by screws 13.
The electric wire of the magnetizing coil 12 (not shown) is also fixed by the screw 13 and the blade fitting 14 is provided.

FIG. 2 is a diagram simply showing a system system utilizing the present invention, and in addition to the heat detector P, a fire receiver RE for issuing a fire alarm and a tester TS for performing a test operation are shown. . The operation of this embodiment will be described with reference to this figure.

The heat detector P normally monitors fires and closes the contacts 4 and 5 by heat to short-circuit the signal lines C and L. The fire receiver RE detects it and performs a fire alarm operation.

The tester TS includes a test power source B and a test switch S, and is connected to the magnetizing coil 12 in the sensor P. Therefore, when the sensor P is to be tested, when the test switch S is turned on, the current necessary for magnetizing the contact plate 10 is supplied from the test power source B, and the coil 1
2 magnetizes the iron contact plate 10. The magnetized contact plate 10 attracts the iron spring plate 9 facing its tip. Then, the movable contact 4 is brought into contact with the fixed contact 5 as in the case of a fire. The receiver RE detects it through the signal lines C and L, and performs a fire alarm operation. From the result, it can be confirmed that the fire operation based on the detector P can be normally performed.

Next, as another embodiment, the constant temperature type heat sensor of FIG. 3 will be described. The body L of the sensor is composed of a base 20 and a thermosensitive element 21, and a bimetal 23 is provided in a housing portion 22 inside the thermosensitive element 21. And
In the event of a fire, the bimetal 23 reverses at a predetermined temperature, and the movable contact 24 pushed up by the displacement of the bimetal 23 contacts the fixed contact 25 to send out a fire signal.

The thermosensitive element 21 has an element case 27 fixed to an element base 26 having a housing portion 22 by caulking or bonding. A bimetal 23 is provided in the central portion of the element case 27, and an iron spring plate 28 provided with the movable contact 4 is in contact with the central portion of the bimetal 23.

The movable contact 4 is provided on the spring plate 28, and the fixed contact 25 is arranged above the movable contact 4 with a predetermined gap. A magnetizing coil 30 is provided on the iron electrode rod 29 provided with the fixed contact 25.

An electrode rod 31 provided with a movable contact 24 via a spring plate 28 and an electrode rod 29 provided with a fixed contact 25.
Is fixed to the printed circuit board 32, and the magnetizing coil 3
0 is fixed to the printed circuit board 32 by the engagement piece 33. The printed circuit board 32 is provided with a connecting means for connecting to a signal line by connecting a lead wire or a blade fitting. The electric wire 34 of the magnetizing coil 30 penetrates the hole of the printed board 32 and is drawn to the outside. Therefore, when the heat sensor L is a waterproof type, it can be embedded with a filler like the lead wire for the signal line or can have a similar waterproof structure.

This constant temperature type heat sensor L is also a differential type heat sensor P.
The system can be configured in the same manner as the above, and the description thereof is the same as the above and will be omitted.

In both of the above-mentioned embodiments, the fire detection element is related to heat, but it may be one that detects smoke, flame or odor. For example, the piston is operated and the movable contact is operated by detecting smoke. The present invention can be fully utilized if it is one.

Further, the material of the electrode member (contact plate 10 and electrode rod 29) of the contact facing the movable contact of each of the above embodiments and the spring member (spring plates 9 and 28) provided with the movable contact are easily magnetized. It may be made of a paramagnetic substance such as iron, but may be made of a normal spring material and a paramagnetic substance attached thereto. Furthermore, the contacts do not necessarily have to be the movable contacts and the fixed contacts, and may be contacts such as a contact that both are displaced.

[0022]

As described above, the fire detector of the present invention is a simple method that can close the contact without requiring the operation of the fire detecting element such as heating, and can be easily operated remotely. There is an effect.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a fire detector according to the present invention.

FIG. 2 is a system diagram of the system using the sensor of FIG.

FIG. 3 is a vertical sectional view showing another embodiment according to the present invention.

[Explanation of symbols]

 4, 24 movable contact 5, 25 fixed contact 9, 28 spring plate (spring member) 10 contact plate (electrode member) 12, 30 magnetizing coil 29 electrode rod (electrode member)

Claims (1)

[Claims] 1. In a fire detector in which signal lines are substantially short-circuited by a movable contact that is displaced based on the operation of a fire detection element, an electrode member facing the movable contact is provided with the electrode member when a test voltage is applied. A magnetizing means for magnetizing is provided,
When the magnetizing means is in operation, the electrode member is magnetized, and a spring member provided with the movable contact is attracted to the fire detector.