JPH0726794Y2 - Combined fire detector - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention provides a differential fire detector that operates when the ambient temperature rises at a predetermined rate of rise, and a constant temperature that operates when a specific temperature is reached. The present invention relates to a composite fire detector including an operating element.

[Prior art]

Conventionally used differential fire detectors operate sensitively to sudden temperature rises, but to moderate temperature rises the rate of rise is low even when the ambient temperature rises. Does not work. Similarly, the constant temperature type fire detector that has been conventionally used operates reliably at a predetermined temperature,
It takes a long time from the occurrence of a fire until the ambient temperature reaches a predetermined temperature, and it takes time to operate. Therefore, if a compound fire detector having both functions is used to compensate for each other's drawbacks, fire detection can be performed efficiently.

As such a composite fire detector, a protrusion for accommodating the bimetal is provided on the inner surface of the heat receiving plate of the differential fire detector, the bimetal is accommodated in this protrusion, and the bimetal is moved inside the air chamber by reversing the bimetal. , A composite fire detector has been proposed which is provided with a rod that opens and closes contacts via a diaphragm.

[Problems to be solved by the device]

The combined fire detector, which has both the constant temperature operation function and the differential operation function, has a very complicated structure because both functions are combined into one detector. The air chamber that configures the differential operation function is easily deformed by objects hitting it during transportation or after installation.If a bimetal or the like that configures the constant temperature operation function is provided in the air chamber, the deformation of the air chamber causes the bimetal The displacement will not be accurately transmitted to the electrical contacts via the rod. Therefore, both the constant temperature operation function and the differential operation function may not work sufficiently.

[Means for Solving the Problems]

The present invention aims to obtain a composite type fire detector that is simply configured by incorporating a constant temperature operation unit consisting of a bimetal, a rod, and their support between the heat receiving plate that constitutes the air chamber and the mounting frame. For the purpose, in a compound fire detector having an air chamber composed of a heat receiving plate, a diaphragm and a mounting frame, and having a rod for transmitting a bimetal and its displacement to the diaphragm in the air chamber, a penetration for slidably supporting the rod. A support base having a hole is provided between the mounting frame and the heat receiving plate, and at the same time, the support base is fixed to the mounting frame or the heat receiving plate and abuts on the heat receiving plate or the mounting frame. It is what

Further, in a composite fire detector having an air chamber formed by a heat receiving plate, a diaphragm and a mounting frame, and having a rod for transmitting a bimetal and its displacement to the diaphragm in the air chamber, a through hole for slidably supporting the rod. And a support base having a heat receiving plate, the support base being fixed to the mounting frame or the heat receiving plate and being in contact with the heat receiving plate or the mounting frame, and A storage portion, which communicates with the through hole and stores the bimetal, is provided at an end of the support base on the heat receiving plate side, and the bimetal is in contact with the heat receiving plate by the rod. It is a thing.

Further, a spring weaker than the reversal force of the bimetal is provided in the through hole that slidably supports the rod of the support base, and a guide with which the spring abuts is provided on the rod. It is pressed against the bimetal side.

[Action]

A support base that supports rods and bimetals is provided in the air chamber, and the support base is fixed to the mounting frame or heat receiving plate and abuts on the mounting frame and heat receiving plate, and acts as a pillar, so it is easily dented by impact or the like. It is possible to reinforce the central portion of the heat receiving plate and determine the volume on the basis of the height of the support base when manufacturing the air chamber.

In addition, the support base comprehensively supports the rod and bimetal,
Since the rod is brought into contact with the center of the bimetal, the displacement of the bimetal can be accurately transmitted to the electrical contact via the rod.

Furthermore, since the rod is pressed by a spring that is weaker than the reversing force of the bimetal, the bimetal efficiently absorbs the heat from the heat receiving plate, and the minute displacement of the bimetal does not reach the diaphragm, which affects the volume of the air chamber. Don't give.

〔Example〕

An embodiment of the composite fire detector according to the present invention will be described below with reference to the drawings. The heat receiving plate 1 that receives the ambient temperature is formed into a bowl shape by pressing a thin metal plate, and its peripheral edge portion 1a is an engaging groove provided in the peripheral edge portion of a base 2 made of synthetic resin or the like.
It is fitted into 2a and is closely attached by caulking. A mounting frame 4 for mounting a diaphragm 3 formed by pressing a metal thin plate such as beryllium copper between the heat receiving plate 1 and the base 2.
And the mounting frame 4 has a peripheral edge portion 4a similar to that of the heat receiving plate 1.
Is caulked into the engaging groove 2a. The diaphragm 3 is arranged at the center of the mounting frame 4 by soldering. The leak resistor 5 is placed at a position off the center of the mounting frame 4.
The leak resistor 5 serves to ventilate the air in the air chamber 6 constituted by the heat receiving plate 1, the diaphragm 3 and the mounting frame 4 with the outside air at a certain passage rate. A dish-shaped bimetal 7 arranged at the center of the inside of the heat receiving plate 1 to be inverted at a predetermined temperature, and a rod 8 which is in contact with the concave surface of the bimetal 7 and which receives the movement of the center due to the inversion, are slidably and comprehensively supported. A supporting base 9 is fixed to the central portion of the mounting frame 4 with a screw 10 and the opposite side is in contact with the heat receiving plate 1. Thus, since the support base 4 is provided between the heat receiving plate 1 and the mounting frame 4 so as to be in contact with both of them, the support base 4 can always keep the distance between them constant. Support base 9
The mounting frame 4 is provided with holes 4b and 9b for communicating the space between the heat receiving plate 1 and the mounting frame 4 with the diaphragm 3 at the same position. A spring 11 is inserted between the rod 8 and the through hole 9c of the support base 9, and the spring 11 is sandwiched between a guide 8a provided on the rod 8 and a peripheral edge 9e of the through hole 9c. The pushing force of the spring 11 is weaker than the force when the bimetal 7 is reversed, and the shape is not limited to the spiral shape, and a leaf spring or the like may be used. The movable contact spring 12 is in contact with the side of the diaphragm 3 opposite to the surface pushed by the rod 8, and the movable contact spring 12 is screwed to the base 2 with a screw 13.
A movable contact 12a is provided at the tip of the movable contact spring 12, and an adjustment contact spring 14 is arranged facing the movable contact 12a.
Screw the base 2 so that the adjustment contact 14a is located just before 12a.
It is screwed by 15. The tip portion of the adjustment contact spring 14 is a contact adjustment screw screwed from the opposite side of the base 2.
It is pushed out by 16 to adjust the distance between the contacts 12a and 14a.
The screws 13 and 15 for fixing the contact springs 12 and 14 form a conductive portion, and simultaneously fix the connection fittings 17 and 18 that are provided on the opposite side of the contact portion of the base 2 and also serve as a conductive fitting. . Second
As shown in the figure, a flat portion of the mounting frame 4 is provided with a hole 4b for allowing the rod 8 to penetrate therethrough for ventilation, and further has a hole 4d for screwing the support base 9 outside thereof. A hole 4e for fitting the leak resistor 5 is provided at a position away from the center that does not overlap the diaphragm 3. As shown in FIG. 3, the support base 9 screwed to the mounting frame 4 has a hole 9c for supporting the rod 8 and a hole 9 for allowing ventilation.
b, screws 10 for screwing are installed in holes 4b, 4
It is provided at a position overlapping with d. In the present embodiment, the support base 9 is screwed, but it may be a fitting type.
Further, it may be fixed to the heat receiving plate 1 without being fixed to the mounting frame 4.

Next, the operation of this embodiment will be described. When the ambient temperature rapidly rises due to the occurrence of fire, the heat receiving plate 1 receives the heat and rapidly expands the air in the air chamber 6. The expanded air cannot sufficiently leak from the leak resistor 5, so the diaphragm 3 is pushed out. Extruded diaphragm 3
Pushes the movable contact spring 12 to close the electrical contacts 12a and 14a,
Give an alarm. This operation is effective only when the ambient temperature rises rapidly. If the ambient temperature rises slowly, even if a fire occurs, the expanded air leaks from the leak resistor 5 and the ambient temperature rises. No matter how high it is, it doesn't give an alarm. In case of such a fire, take another action. That is, the bimetal 7 supported by the support 9 is arranged in the central portion of the inside of the heat receiving plate 1 of the air chamber 6. The bimetal 7 has a dish shape, and when the temperature reaches a predetermined temperature, the peripheral portion and the top are turned upside down. Therefore, when the bimetal 7 reaches a predetermined temperature due to an increase in ambient temperature due to a fire, the bimetal 7 is reversed and pushes up the rod 8 against the force of the spring 11. The rod 8 pushes the movable contact spring 12 through the diaphragm 3 to close the electric contacts 12a and 14a, and issues an alarm.

[Advantages of the Invention] The composite fire detector according to the present invention comprises a heat receiving plate, a diaphragm, and an attachment frame to form an air chamber, and the composite fire detector has a bimetal in the air chamber and a rod for transmitting its displacement to the diaphragm. In, a support base having a through hole for slidably supporting the rod is provided between the mounting frame and the heat receiving plate, and at the same time, the support base is fixed to the mounting frame or the heat receiving plate and Since it abuts against the heat receiving plate or the mounting frame, the support table provided between the mounting frame and the heat receiving plate keeps the volume of the air chamber constant at the time of manufacturing, so that the leak resistance and the contact distance can be easily adjusted. At the same time, it is possible to prevent deformation of the air chamber.

Further, in a composite fire detector having an air chamber formed by a heat receiving plate, a diaphragm and a mounting frame, and having a rod for transmitting a bimetal and its displacement to the diaphragm in the air chamber, a through hole for slidably supporting the rod. And a support base having a heat receiving plate, the support base being fixed to the mounting frame or the heat receiving plate and being in contact with the heat receiving plate or the mounting frame, and At the end of the support base on the heat receiving plate side, a storage portion that communicates with the through hole and stores the bimetal is provided, and since the bimetal is brought into contact with the heat receiving plate by the rod, the heat receiving should be performed. Even if the plate is deformed, the positional relationship between the rod and the bimetal does not change due to the through hole of the support table, and the constant temperature operation function can be maintained.

Further, a spring weaker than the reversal force of the bimetal is provided in the through hole that slidably supports the rod of the support base, and a guide with which the spring abuts is provided on the rod. Since it is pressed to the bimetal side, a minute displacement of the bimetal is not transmitted to the diaphragm, and the movement of the rod is relaxed to prevent the diaphragm from being distorted and the volume of the air chamber is not changed. . Then, there is an effect that the bimetal is pressed against the heat receiving plate to efficiently conduct heat.

As described above, according to the present invention, it is possible to obtain a highly reliable composite fire detector.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of a composite fire detector according to the present invention, FIG. 2 is a plan view of a mounting frame, and FIG. 3 is a plan sectional view of a support base taken along line III-III. Is. 1 ... Heat receiving plate, 3 ... Diaphragm, 4 ... Mounting frame, 6
…… Air chamber, 7 …… Bimetal, 8 …… Rod, 8a ……
Guide, 9 ... Support base, 9c ... Through hole.

Claims (3)

[Scope of utility model registration request] 1. A composite fire sensor comprising a heat receiving plate, a diaphragm, and a mounting frame to form an air chamber, and a bimetal and a rod for transmitting the displacement to the diaphragm in the air chamber. A support having a through hole is provided between the mounting frame and the heat receiving plate,
At the same time, the support base is fixed to the mounting frame or the heat receiving plate and is in contact with the heat receiving plate or the mounting frame, and the composite fire detector is characterized. 2. A composite fire detector comprising a heat receiving plate, a diaphragm, and a mounting frame to form an air chamber, and a bimetal and a rod for transmitting the displacement thereof to the diaphragm in the air chamber, the rod being slidably supported. A support having a through hole is provided between the mounting frame and the heat receiving plate,
At the same time, the support base is fixed to the mounting frame or the heat receiving plate and abuts against the heat receiving plate or the mounting frame, and an end portion of the support base on the heat receiving plate side communicates with the through hole. In addition, a storage unit for storing the bimetal is provided, and the bimetal is in contact with the heat receiving plate by the rod, the composite fire detector. 3. A spring weaker than the reversal force of the bimetal is provided in a through hole that slidably supports the rod of the support base, and a guide with which the spring abuts is provided on the rod. The composite fire sensor according to claim 1 or 2, wherein the spring is pressed against the bimetal side.