JPH0517756Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application This invention relates to a thermal fire detector, and more specifically, to a thermal fire detector equipped with means for connecting and disengaging the main body and the base.

Conventional technology There are two types of thermal fire detectors: constant temperature type and differential type. Both types of detectors have a thermally responsive body in the main body, and a contact point corresponding to the thermally responsive body in the base. The contact point is controlled by the displacement of the heat-responsive body caused by the fire, and fire detection is performed.

By the way, when assembling the above sensor,
The main body and the base are fixed together with an adhesive, but with this method of fixing, if an abnormality occurs after assembly, it is difficult to separate the two and repair or replace the parts.

Therefore, conventionally, the two are fixed with a screw, and when repair or replacement of parts is required, the screw is removed to separate the two.

Problems that the invention aims to solve In the conventional example, the main body and base are fixed using multiple screws, so each screw must be tightened and removed one by one each time the assembly or separation is performed. .

Therefore, these operations become troublesome and require a lot of time.

In particular, when it becomes necessary to repair or replace parts, extra effort is required in addition to the work, which impairs work efficiency.

Furthermore, if the screws become loose due to vibration or the like, the distance between the thermally responsive body and the contact points may change, and the fire detector may not operate correctly.

In view of the above-mentioned circumstances, the purpose of this invention is to easily engage and disengage the main body and the base, and to prevent the two from disengaging in the engaged state. Another purpose is to set and maintain a predetermined distance between the thermally responsive body and the contact point.

Means for Solving the Problems This invention consists of a main body having a thermally responsive body, a base having a contact point corresponding to the thermally responsive body,
A thermal fire detector in which a predetermined distance is provided between the thermally responsive body and the contact point; is provided with a plurality of protrusions at intervals in the circumferential direction; a guide groove having a circumferential portion into which the protrusions are inserted and rotationally engaged is formed on the outer circumferential surface of the lower periphery of the base; The groove end of the circumferential part forms an engagement positioning part for maintaining a predetermined distance between the thermally responsive body and the contact point, and as the lower side of the circumferential part of the guide groove approaches the groove end. The groove end is provided with a through hole through which a fixing means is inserted into the circumferential portion, and the fixing means inserted into the through hole allows the protrusion to move upwardly toward the groove end. This is a thermal fire detector characterized by: being fixed to a

Function: After fitting the protrusion on the upper periphery of the main body into the groove on the lower periphery of the base, when the main body is rotated clockwise while fixing the base, the protrusion will fit into the lower side which is inclined within the circumference of the guide groove. It moves while rising along the groove, and stops moving when it hits the edge of the groove.

In this engaged state, the protruding rod is inserted into the through hole and brought into contact with the protrusion at the end of the groove, thereby preventing the main body from rotating in the opposite direction.

Next, when the protruding rod is pulled out from the through hole and the main body is rotated in the opposite direction, the protrusion comes out of the groove and the main body separates from the base.

Embodiment An embodiment of this invention will be described with reference to the accompanying drawings, where the same reference numerals have the same names and functions.

The differential fire detector F is composed of a main body 1 and a base 6.

As shown in FIG. 1, a main body 1 is provided with a thermally responsive body, such as a diaphragm 2, in the center thereof, and a leak hole 3 is formed near the diaphragm 2 for releasing expanded air.

There are three hemispherical protrusions 5 on the upper peripheral edge 4 of the main body 1.
They are arranged at equal intervals.

As shown in FIG. 2, contacts 7 and 8 are fixed to the center of the base 6 with screws 9 and 10, and a ring-shaped groove 11 is sandwiched between the outer periphery 12 at the periphery of the base 6. and a lower peripheral edge 13 are formed.

Three guide grooves 14 to 16 are arranged at equal intervals on the outer peripheral surface of the lower peripheral edge 13.

As shown in FIGS. 3 and 4, these grooves 14 to 16 have a vertical portion a, a circumferential portion b, and a groove end c, and the circumferential portion b has an inclined lower side. .

In addition, the groove 16 has a protruding rod 1 as shown in FIG.
There is a through hole 18 for inserting the hole 1.
8 communicates with the circumferential portion b.

The protruding rod 17 consists of a protruding part 19 and a knob part 20, as shown in FIG.
It constitutes a fixing means for fixing to.

Next, the operation of this embodiment will be explained. The protrusion 5 of the main body 1 is fitted into the vertical portion a of the guide grooves 14 to 16 of the base 6.

When the main body 1 is rotated clockwise while the base 6 is fixed, the protrusion 5 moves within the guide grooves 14 to 16 while being guided by the circumferential portion b and comes into contact with the groove end c.

At this time, since the lower side of the circumference is formed to be inclined, as the main body 1 is rotated, the upper edge of the main body 1 comes into contact with the base 6 and is tightened.

The protrusion 5 then comes into close contact with the groove end c, resulting in the state 5A in FIG. 4. This groove end c serves as an engagement positioning portion for maintaining a predetermined distance between the thermally responsive body 2 and the contact 7.

At this time, there is a predetermined distance between the diaphragm 2 of the main body 1 and the contact point 7 of the base 6, and the upper edge of the main body 1 comes into contact with the base 6. Therefore, the main body 1 and the base 6 are integrated while contacting each other over a wide area, so there is no risk of wobbling or the like.

Next, the grip portion 20 of the protruding rod 17 is pinched, and the protruding portion 19 is inserted into the through hole 18 to be in the state 19A in FIG. 4 to prevent the protrusion 5 from returning.

FIGS. 6 and 7 are longitudinal sectional views showing this engaged state.

In FIG. 6, the contact point 7 and the contact point 8 are separated by a distance l
However, if a fire occurs, the heat-responsive body 2
is displaced to the contact point 7 side, presses the contact point 7, and the contact point 7 and the contact point 8 come into contact with each other, thereby notifying the fire.

22 is a fitting for attaching to a ceiling or the like.

Next, the case of disengaging the protrusion from the groove will be described.
The protrusion 19 is pulled out from the through hole 18, the main body 1 is turned in the opposite direction, and then moved in the vertical direction to remove the protrusion 5 from the vertical part a.

Although a differential fire detector is illustrated as an example, this invention can also be applied to a constant temperature fire detector.

In this case, a bimetal or the like is used as the thermally responsive body.

Further, in the case of a differential type, a bellows may be used in place of the diaphragm in the above embodiment.

Effects of the invention Since this invention is constructed as described above, it has the following remarkable effects.

Since the protrusion of the main body and the guide groove of the base are formed to be attached and detached by rotation, it is extremely easy to connect and separate the base and the main body.

Since the groove end of the circumferential portion serves as an engagement positioning portion for maintaining a predetermined distance between the thermally responsive body and the contact, the groove end is fixed by the fixing means inserted into the through hole. When the protrusion is fixed,
Since the predetermined interval is always maintained, the sensor does not malfunction unlike the conventional example.

Since the lower side of the circumference of the guide groove is sloped upward as it approaches the groove end,
As the main body is rotated, the upper edge of the main body comes into contact with the base and is tightened. Therefore, since the main body and the base are integrated while contacting each other over a wide area, there is no risk of wobbling or the like.

[Brief explanation of the drawing]

Figures 1 to 7 are views showing an embodiment of this invention. Figure 1 is a plan view of the main body, Figure 2 is a bottom view of the base, and Figures 3 and 4 are views of the grooves. FIG. 5 is an enlarged plan view, FIG. 5 is a perspective view of the protruding rod, FIG. 6 is a vertical cross-sectional view in an engaged state, and FIG. 7 is a vertical cross-sectional view of a portion different from FIG. 6. 1... Main body, 2... Thermal response body, 5... Protrusion, 6
... Base, 7, 8 ... Contact, 14, 15, 16...
...Groove, 17...Protruding rod.

Claims (1)

[Scope of utility model registration request] A thermal fire detector consisting of a main body having a thermally responsive body and a base having a contact point corresponding to the thermally responsive body, the thermal fire detector having a predetermined distance between the thermally responsive body and the contact point; It has an upper peripheral edge whose upper edge abuts the base, and the inner peripheral surface of the upper peripheral edge is provided with a plurality of protrusions at intervals in the circumferential direction; the outer peripheral surface of the lower peripheral edge of the base A guide groove is formed with a circumferential portion into which the protrusion is inserted and rotationally engaged, and a groove end of the circumferential portion is an engagement groove for maintaining a predetermined distance between the thermally responsive body and the contact point. The lower side of the circumferential portion of the guide groove is inclined to rise as it approaches the groove end, and the fixing means is inserted into the circumferential portion at the groove end. A thermal fire detector characterized in that a through hole is provided, and the protrusion is fixed to the groove end by the fixing means inserted into the through hole.