JP2556101Y2 - Fire detector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire detector in which a heat detecting section is sealed.

[0002]

2. Description of the Related Art A heat sensitive element such as a bimetal is provided between a tip of a support column of a heat sensitive element of a fire detector and a heat sensitive plate. If this heat sensitive element comes into contact with moisture, outside air, etc., the sensitivity of the fire detector will be reduced. Therefore, conventionally, a space between the tip edge of the support column and the heat-sensitive plate (hereinafter referred to as a seal space).
Then, the space between the two is sealed by filling the resin from the horizontal direction.

[0003]

In the conventional fire detector, since the resin is filled in the horizontal direction to seal the sealing space, the filling operation is difficult. Therefore, work efficiency is not good. In addition, since the resin is horizontally injected into the sealing space toward the center of the support base, it is difficult to uniformly fill the sealing space with a small amount of filler. Therefore, a large amount of filler is injected into the seal space to prevent leakage of the seal.

[0004] In view of the above circumstances, it is an object of the present invention to improve the efficiency of the sealing operation and to completely seal with a small amount of filler.

[0005] In this invention, in a fire detector in which a metal cover portion of a heat-sensitive plate is provided hermetically at the tip of a support column of a heat-sensitive element, a cylindrical portion fitted to the support column is provided on the inner surface of the metal cover portion. A fire groove, wherein a top end of the cylindrical portion is directed upward, and a seal groove that opens upward is provided between the distal end of the cylindrical portion and the outer peripheral surface of the support column. .
In addition, this invention involves fitting a tubular portion of a metal cover to the tip of the support column of the thermal element, fitting a leg of a heat-sensitive plate to the tubular portion of the metallic cover, and removing the tubular portion of the metallic cover. A top end of the metal cover, and a seal groove that opens upward between a front end of the cylindrical portion of the metal cover and an outer peripheral surface of the support column.

[0006]

The cylindrical portion of the metal cover is fitted to the support column of the heat-sensitive element, and a seal groove is formed between the tip of the cover and the outer peripheral surface of the support column. Inject resin and fill the seal groove.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the accompanying drawings, wherein the same reference numerals have the same names and functions. A support column 4 for holding a heat-sensitive element such as a bimetal 8 is adhered to the center of the housing 1 of the fire detector. The tip end surface of the support column 4 is formed to have a concave cross section. The cylindrical portion 5a of the metal cover 5 is fitted to the distal end of the support column 4 to cover the distal end surface, thereby forming the heat-sensitive chamber 30.

In the heat-sensitive chamber 30, a bimetal 8, which contacts the inner surface of the metal cover 5, a movable contact spring 9, a fixed contact 10 facing the spring 9, and legs 11 of the heat-sensitive element as lead wires. Is housed. Between the distal end portion 5b of the cylindrical body portion 5a of the metal cover 5 and the outer peripheral surface 4b of the support column 4,
A seal groove 31 that opens upward is formed.

The heat-sensitive plate 6 is attached to the cylindrical body 5a of the metal cover 5.
Then, for example, a photocurable resin 7 is injected into the seal groove 31. Since this seal groove 31 is opened upward, it is easy to inject, and a small amount of resin 7 is used.
Can be reliably sealed. A printed circuit board 12 on which an electric circuit is mounted, and a back cover 15 forming a wire connection portion
Are prepared, and the ends of the terminal fittings (not shown) fitted to the back cover 15 are soldered to predetermined positions on the printed circuit board 12 to integrate them. Then, the printed circuit board 12 integrated with the back cover 15 is opposed to a predetermined position on the sensor housing 1 from which the legs 11 of the heat-sensitive element protrude, and a metal fitting 13 provided on the printed circuit board 12 is attached to the legs. The back cover 15 is fixed so as to sandwich the portion 11, and the printed circuit board 12 is sandwiched by screws 16. Protector 2
The protector 2 is attached to the sensor housing 1 by inserting and engaging the engaging portion of the above into the through hole of the sensor housing 1 or the like.

In the drawings, reference numeral 14 denotes the printed circuit board 1.
The LED is inserted in the second hole.

The embodiment of the present invention is not limited to the above. For example, instead of separately forming a metal cover having a cylindrical body portion and a heat-sensitive plate having a leg portion, and fitting them together, It may be configured as shown in FIG. That is, a cylindrical portion 6d is formed at the center of the inner surface of the heat sensitive plate 6, and the cylindrical portion 6d is fitted to the tip 4a of the support column 4 of the thermal element. Then, a seal groove 31 that opens upward is formed between the distal end portion 6b of the cylindrical body portion 6d and the outer peripheral surface 4b of the support column 4. The photocurable resin 7 is injected into the seal groove 31 from above in the same manner as in the above embodiment.

[0012]

According to the present invention, the seal groove is opened upward. As a result, the filler can be evenly injected into the seal groove from above, so that the sealing operation is easier than in the conventional example. Further, even if the amount of the filler used is smaller than that of the conventional example, the seal can be completely sealed. Accordingly, since the filler hardens in a shorter time than in the conventional example, the work efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and is an enlarged view of a main part of FIG. 2;

FIG. 2 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 3 is a plan view showing an embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing another embodiment of the present invention, and is an enlarged view of a main part corresponding to FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Fire detector housing 4 ... Support column of thermal element 5 ... Metal cover 6 ... Thermal plate 7 ... Resin 8 ... Bimetal 31 ... Seal groove

Claims (3)

(57) [Scope of request for utility model registration] 1. A fire detector in which a metal cover portion of a heat-sensitive plate is hermetically provided at a tip of a support column of a heat-sensitive element; a tubular portion fitted to the support column is erected on an inner surface of the metal cover portion. and upwards the tip of the tube body portion, the fire detector, characterized in that a seal groove opening upward between the tip and the outer peripheral surface of the support column of the cylindrical body portion. 2. A tubular body of a metal cover is fitted to a tip of a support column of the heat-sensitive element, and a leg of a heat-sensitive plate is fitted to a tubular body of the metal cover. A fire sensor, wherein a tip of a tip part is directed upward, and a seal groove which opens upward is provided between a tip part of a cylindrical body part of the metal cover and an outer peripheral surface of the support column. 3. A supporting column adhered to a central portion of the housing and holding the heat-sensitive element; a cylindrical portion of a metal cover fitted to a tip of the supporting column; An upwardly-opening seal groove provided between a distal end portion of the cylindrical portion of the metal cover and an outer peripheral surface of the support column; a sealing resin injected into the seal groove; A leg portion of the thermosensitive element protruding into the body; a printed circuit board having a metal sandwiching the leg portion; a back cover fixed to an inner surface of the housing and fixing the printed circuit board to the housing. A fire detector comprising: