JP7049174B2 - Shielding plate for fire detector - Google Patents

Description

The present invention relates to a shield plate for a fire detector that prevents dust and the like from entering a fire detector fixed to an installation surface such as a ceiling surface of a building.

The fire detector is fixed to the installation surface of the building such as the ceiling. Examples of the fire detector include a fire detector that detects smoke, a fire detector that has a heat detector that detects heat from a fire, a fire detector that detects gas, or a fire detector that combines these functions. Etc. are known.

The fire detector is mounted and fixed to a mounting base that is fixed to the installation surface. The mounting base is fixed to the installation surface by screwing or the like, and an engaged metal fitting or the like for fixing the fire detector is provided on the surface opposite to the surface in contact with the installation surface. The fire detector has an engaging metal fitting that engages with the engaged metal fitting of the mounting base on the surface on the installation surface side. As described above, as a structure in which the fire detector is fixed to the mounting base fixed to the installation surface, for example, there is one as mentioned in Patent Document 1.

Japanese Unexamined Patent Publication No. 2006-288459

In a fire detector, an airflow or hot airflow containing smoke generated by a fire is allowed to flow into the housing of the fire detector, and when the smoke concentration or temperature above a certain level continues for a certain period of time or longer, it is determined that a fire has occurred. .. When a strong wind blows on the fire detector, the airflow flowing into the housing of the fire detector may blow through as it is, and the fire may not be detected with high sensitivity. For this reason, it is necessary to protect the fire detectors installed in places where strong winds blow. In addition to the need for windbreaks, it is also necessary to avoid intrusion of dust and the like into the housing and the adhesion of dirt due to these. For example, a fire detector that detects smoke has a light emitting unit and a light receiving unit inside the housing, and the light from the light emitting unit is diffusely reflected by the smoke taken into the housing and diffusely reflected by the light receiving unit. Smoke is detected by receiving light. If dirt adheres to the light emitting portion or the light receiving portion, the sensitivity for detecting smoke decreases. Therefore, the fire detector is provided with a function for detecting dirt adhesion. The fire detector will notify the occurrence of a failure when the adhesion of dirt is detected.

Depending on where it is installed, such as near an air conditioner or in an outdoor corridor, the fire detector may be continuously exposed to wind from a certain direction. Not only when a strong wind blows as described above, but also when a light wind is continuously exposed, dirt such as dust easily adheres to the fire detector, and there is a high possibility that a failure will occur due to the dirt adhesion. Become.

If it is known in advance that a strong wind blows from a certain direction, a shielding plate may be provided in the vicinity of the fire detector when the fire detector is installed. However, it is difficult to predict in advance which of the many fire detectors installed in the building will be affected by dirt due to a breeze, and it is also difficult to predict the direction of the wind. For this reason, it is conceivable that a shielding surface will be retrofitted after a certain amount of time has passed since the fire detector was installed, depending on the state of dirt adhesion.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a fire detector shielding plate capable of retrofitting a shielding surface in the vicinity of a fire detector installed on an installation surface.

In order to solve the above problems, the fire detector shielding plate according to the invention of claim 1 is a fire detector shielding plate having a shielding surface portion arranged around the fire detector fixed to the installation surface.
It has a base portion along the installation surface and the shielding surface portion rising from the base portion.
The base has a fixing portion that is sandwiched and fixed between the fire detector and the installation surface.
The base portion has a through-hole portion through which a wiring portion extending from the fire detector side to the installation surface is inserted, and the through-hole portion opens the through-hole portion in a direction parallel to the installation surface. It is characterized by having a notch .
Further, the fire detector shielding plate according to the invention of claim 2 is a fire detector shielding plate having a shielding surface portion arranged around the fire detector fixed to the installation surface.
It has a base portion along the installation surface and the shielding surface portion rising from the base portion.
The base has a fixing portion that is sandwiched and fixed between the fire detector and the installation surface.
The base portion has a through hole portion through which a wiring portion extending from the fire detector side to the installation surface is inserted, and the through hole portion is configured to be continuous to one edge of the base portion. ing.

According to the inventions according to claims 1 and 2 , since the base can be sandwiched between the fire detector and the installation surface and fixed, a shield plate for the fire detector is attached to the fire detector already installed on the installation surface. Can be easily installed with the attachment. By installing a shield plate for the fire detector and facing the shield surface to the side of the fire detector, dust etc. can enter the inside of the fire detector or adhere to the housing of the fire detector due to the wind. It can be suppressed, and the decrease in sensitivity of fire detection due to the influence of dust and the like can be suppressed. Further, the shielding surface portion can reduce the flow velocity of the wind blown to the fire detector so that smoke, hot air flow, etc. generated at the time of a fire can stay in the fire detector. Further, the fire detector shielding plate can be inserted along the direction parallel to the installation surface without removing the wiring portion from the fire detector, and the installation can be facilitated.

Further, in the shield plate for a fire detector according to the invention of claim 3 , the fixing portion is provided on the installation surface and is sandwiched between the mounting base on which the fire detector is fixed and the installation surface. It is configured as a feature.

According to the third aspect of the present invention, the mounting base to which the fire detector is mounted is temporarily removed from the installation surface, and a fire detector shielding plate is inserted between the mounting base and the installation surface to shield the fire detector. The board can be easily fixed.

Further, in the shield plate for a fire detector according to the invention of claim 4 , the fixing portion is sandwiched between the mounting base provided on the installation surface and to which the fire detector is fixed and the fire detector. It is configured as a feature.

According to the invention of claim 4 , by removing the fire detector from the mounting base, it is possible to mount the fire detector shielding plate, and it is possible to eliminate the need to remove the mounting base from the mounting surface.

Furthermore, the fire detector shielding plate according to the invention of claim 5 is a fire detector shielding plate having a shielding surface portion arranged around the fire detector fixed to the installation surface.
It has a base portion along the installation surface and the shielding surface portion rising from the base portion.
The base has a fixing portion that is sandwiched and fixed between the fire detector and the installation surface.
The fixed portion is abutted and sandwiched between the fire detector and the installation surface.
The base portion has an installation surface side fixing portion fixed to the installation surface, a sensor side fixing portion for fixing the fire detector, and a fixing portion of a wiring portion connected to the fire detector. It is configured as a feature.

According to the invention of claim 5 , even when the fire detector is directly fixed to the installation surface, the fire detector shielding plate can be sandwiched between the fire detector and the installation surface and fixed. In addition, since the function of the mounting base for fixing the fire detector to the installation surface is integrated into the shield plate for the fire detector, the shield plate for the fire detector can be mounted on the installation surface instead of the mounting base to shield the fire detector. The fire detector can be fixed to the installation surface while the surface portion is installed so as to face the fire detector. As a result, the number of parts can be reduced and the environmental load can be reduced.

Further, in the shielding plate for a fire detector according to the invention of claim 6 , the shielding surface portion has an outer shape larger than the outer shape of an image obtained by projecting the fire detector onto the shielding surface portion at least when the shielding surface portion is fixed to the installation surface. It is configured to have.

According to the invention of claim 6 , since the shielding surface portion can completely hide the fire detector in the direction facing the fire detector, it is possible to effectively suppress the intrusion of dust into the fire detector. can.

According to the fire detector shielding plate according to the present invention, the fire detector shielding plate can be easily installed afterwards, and the shielding surface portion can be arranged in the vicinity of the fire detector, so that the airflow toward the fire detector can be arranged. It is possible to reduce the flow velocity and suppress the occurrence of failures due to dirt adhering to the fire detector. In addition, by making it possible for smoke and hot airflow generated during a fire to stay in the fire detector, the airflow will not blow through the fire detector in a short time due to strong wind, and the fire detector will reliably detect the fire. It can be carried out. Further, even after installation, the orientation of the shielding surface portion can be easily changed by changing the mounting angle of the fire detection shielding plate.

It is a front view in the installed state of the shield plate for a fire detector, the fire detector, and the mounting base in this embodiment. It is a perspective view of a mounting base. It is sectional drawing of the fire detector, and is the explanatory view which omitted the internal structure other than a housing, a terminal board, and an engaging metal fitting. It is a perspective view of the shielding plate for a fire detector. It is a bottom view of the shielding plate for a fire detector. It is an exploded side view at the time of attaching the shield plate for a fire detector. It is a bottom view of the shield plate for a fire detector which concerns on the 1st modification. It is a bottom view of the shield plate for a fire detector which concerns on the 2nd modification. It is a front view in the installation state of the shield plate for a fire detector, the fire detector, and the mounting base in the second embodiment. It is a front view in the installation state of the shield plate for a fire detector and the fire detector in the third embodiment.

Embodiments of the present invention will be described in detail with reference to the drawings. The fire detector 10 of the present embodiment is fixed to an installation surface 100 such as the ceiling of a building and detects smoke generated by a fire. FIG. 1 shows a front view of the fire detector shielding plate 12, the fire detector 10, and the mounting base 11 in the present embodiment in an installed state. As shown in this figure, the fire detector 10 of the present embodiment is fixed to the installation surface 100 via the mounting base 11, and there is a fire between the mounting base 11 and the installation surface 100. The sensor shielding plate 12 is sandwiched and fixed.

FIG. 2 shows a perspective view of the mounting base 11. As shown in this figure, the mounting base 11 has a flat and substantially cylindrical main body portion 30. A wiring hole 32 for inserting a wiring portion 23 extending toward the installation surface 100 is provided on the bottom surface portion 31 facing downward when the main body portion 30 is attached. Further, the bottom surface portion 31 is provided with an engaged metal fitting 33 for rotationally engaging the fire detector 10 and a fixing hole portion 34 for inserting a screw for fixing the mounting base 11 to the installation surface 100. Has been done. Two engaged metal fittings 33 and two fixing holes 34 are provided in the circumferential direction of the bottom surface portion 31, respectively. The engaged metal fitting 33 is electrically connected to the wiring portion 23.

FIG. 3 is a cross-sectional view of the fire detector 10 and shows an explanatory view in which the internal structure other than the housing 20, the terminal board 21, and the engaging metal fitting 22 is omitted. The fire detector 10 has a housing 20, and the housing 20 has a terminal board 21 as a surface facing the installation surface 100. The housing 20 has a smoke inlet 20a, and a smoke detection unit and the like are arranged inside the housing 20, but they are omitted in FIG.

The terminal board 21 is provided with an engaging metal fitting 22 that engages with the engaged metal fitting 33 of the mounting base 11. Two engaging metal fittings 22 are provided in the circumferential direction of the terminal board 21 corresponding to the engaged metal fittings 33. The fire detector 10 is electrically connected to the mounting base 11 by engaging the engaging metal fitting 22 with the engaged metal fitting 33 of the mounting base 11.

The main body 30 of the mounting base 11 and the housing 20 of the fire detector 10 are made of a resin material such as plastic. However, these may be made of other materials.

FIG. 4 shows a perspective view of the fire detector shielding plate 12, and FIG. 5 shows a bottom view of the fire detector shielding plate 12. The fire detector shielding plate 12 has a flat base portion 40 along the installation surface 100 and a shielding surface portion 41 rising from the base portion 40. The base portion 40 has a rectangular shape, and the shielding surface portion 41 rises from two opposing sides of the base portion 40, respectively. The shielding surface portion 41 has an outer shape larger than the outer shape of the image projected on the shielding surface portion 41 when the fire detector 10 is fixed to the installation surface 100 at least. As a result, the shielding surface portion 41 completely hides the fire detector 10 in the facing direction, and the wind toward the fire detector 10 can be blocked by the shielding surface portion 41.

A substantially circular through-hole portion 43 is formed in the central portion of the base portion 40. The base 40 is formed with a notch 43a that makes the space portion of the through hole 43 continuous up to the edge of the base 40. Due to the notch 43a, the through hole 43 is open in the direction parallel to the installation surface 100.

The top surface of the mounting base 11 can be brought into contact with the bottom surface side of the base 40 as shown in FIG. The mounting base 11 is shown by the alternate long and short dash line in FIG. The through-hole portion 43 of the base portion 40 is smaller than the diameter of the mounting base 11, and the periphery of the through-hole portion 43 is a fixing portion 42 that abuts and is sandwiched between the mounting base 11 and the installation surface 100.

A wiring portion 23 extending from the fire detector 10 to the installation surface 100 can be passed through the through hole portion 43 of the base portion 40. Further, the cutout portion 43a of the base portion 40 can be inserted with the wiring portion 23 when the fire detector shielding plate 12 is moved in the direction parallel to the installation surface 100 when the fire detector shielding plate 12 is installed. can.

As shown in FIG. 1, the shielding surface portion 41 of the fire detector shielding plate 12 is higher than the fire detector 10 and is spaced apart from the side of the fire detector 10. By arranging the shielding surface portion 41 in this way, it is possible to prevent the airflow R toward the smoke inlet 20a of the fire detector 10 from directly blowing onto the fire detector 10. Dust contained in the airflow R can be prevented from facing the fire detector 10 by falling downward by the shielding surface portion 41 or adhering to the shielding surface portion 41. As a result, it is possible to reduce the adhesion of dirt due to the intrusion of airflow into the inside of the housing 20, and it is possible to suppress the occurrence of a failure of the fire detector 10 due to the adhesion of dirt. On the other hand, the airflow R wraps around the shielding surface portion 41, and at least a part of the airflow R can go in the direction of the fire detector 10. Therefore, when a fire occurs, the airflow R including smoke is not completely blocked, and the fire detection performance can be maintained. In order to allow the shielding surface portion 41 to wrap around the airflow R, the shielding surface portion 41 has an outer shape larger than the outer shape of the image projected on the shielding surface portion 41 when the fire detector 10 is fixed to the installation surface 100, as described above. Therefore, it is desirable to have the minimum area possible. When the fire detector 10 is installed semi-outdoorly outside the building, such as in a passageway, the wind direction is often in a certain direction along the building. Since the shielding surface portion 41 of the present embodiment is arranged so as to face each other with the fire detector 10 interposed therebetween, it does not obstruct the airflow from a direction other than the direction in which the wind blows. For example, if a shielding surface portion is provided so as to surround the fire detector 10, the sensitivity to airflow from a direction other than the direction in which the wind blows is greatly reduced. However, according to the shielding surface portion 41 of the present embodiment. The normal fire detection performance can be maintained.

Further, the shielding surface portion 41 can prevent a strong wind from blowing toward the fire detector 10. When an airflow having a large flow velocity is blown onto the shielding surface portion 41, the flow velocity of the airflow becomes small, and the airflow can be retained at the position of the fire detector 10 for the time required for fire detection.

FIG. 6 shows an exploded side view when the shield plate 12 for a fire detector is attached. The fire detector shielding plate 12 is provided for the existing fire detector 10 that is continuously exposed to the airflow R from one direction. When mounting the fire detector shielding plate 12, the fire detector 10 is removed from the mounting base 11 in advance, and the mounting base 11 is further removed from the mounting surface 100. At this time, it is not necessary to remove the wiring portion 23 extending from the fire detector 10 to the installation surface 100.

The fire detector shielding plate 12 can be inserted between the mounting base 11 and the installation surface 100 along a direction parallel to the installation surface 100. At this time, the wiring portion 23 can be arranged in the through hole portion 43 via the notch portion 43a of the base portion 40. Since the notch 43a and the through hole 43 are formed in the base 40, the fire detector shielding plate 12 can be attached from the side without removing the wiring portion 23. The mounting angle of the fire detector shielding plate 12 is adjusted so that the shielding surface portion 41 faces the air flow R.

After arranging the wiring portion 23 in the through hole portion 43 and adjusting the mounting angle, the mounting base 11 is fixed to the mounting surface 100. As a result, the fixing portion 42 of the base 40 comes into contact with the mounting base 11 and the installation surface 100 and is sandwiched, and the fire detector shielding plate 12 is fixed. Further, the fire detector 10 can be fixed to the mounting base 11 so as to be in the state shown in FIG. Further, even after the fire detector shielding plate 12 is installed, the orientation of the shielding surface portion 41 can be easily reset according to the wind direction of the installation location by the same procedure as at the time of installation. In this way, the fire detector shielding plate 12 can easily set or change the orientation of the shielding surface portion 41.

FIG. 7 shows a first modification of the shield plate for a fire detector. As shown in this figure, the fire detector shielding plate 13 according to the first modification is similar to the fire detector shielding plate 12 shown in FIGS. 4 and 5 in that it has a base portion 40 and a shielding surface portion 41. be. In the fire detector shielding plate 13 of FIG. 7, the through-hole portion 44 has a width of diameter and is continuous up to the edge of the base portion 40. As described above, as long as the fixing portion 42 with which the mounting base 11 abuts is secured and the wiring portion 23 can be inserted, the shape of the through hole portion can be arbitrarily set.

A second modification of the fire detector shielding plate is shown in FIG. As shown in this figure, the fire detector shielding plate 13 according to the second modification is similar to the fire detector shielding plate 12 shown in FIGS. 4 and 5 in that it has a base portion 40 and a shielding surface portion 41. be. The fire detector shielding plate 13 of FIG. 8 has a semicircular through hole portion 45, and the base portion 40 has a width substantially half the width of the shielding surface portion 41. Even in this case, the fixing portion 42 with which the mounting base 11 abuts is secured in the base portion 40 for half a circumference. Even if the base portion 40 has such a shape, it can be sandwiched and fixed between the mounting base 11 and the mounting surface 100, and the wiring portion 23 from the mounting base 11 is passed through the hole portion 45. Can be inserted.

Next, a second embodiment of the present invention will be described. FIG. 9 shows a front view of the fire detector shielding plate 15, the fire detector 10, and the mounting base 11 in the second embodiment in an installed state. As shown in this figure, in the fire detector shielding plate 15 of the present embodiment, the fixing portion 42 of the base 40 is in contact with the fire detector 10 and the mounting base 11 and is sandwiched and fixed. In this case, the base 40 is a fixing portion on the mounting base side that can be locked to the engaged metal fitting 33 of the mounting base 11, and a fixing portion on the fire detector side that can be locked to the engaging metal fitting 22 of the fire detector 10. And have. In this way, the fire detector shielding plate 15 sandwiched and fixed between the fire detector 10 and the installation surface 100 may be sandwiched between the fire detector 10 and the mounting base 11. .. Thereby, by removing the fire detector 10 from the mounting base 11, the fire detector shielding plate 15 can be mounted, and the mounting base 11 does not need to be removed from the mounting surface 100.

Next, a third embodiment of the present invention will be described. FIG. 10 shows a front view of the fire detector shielding plate 16 and the fire detector 10 in the installed state according to the third embodiment. As shown in this figure, in the present embodiment, the fire detector 10 is directly fixed to the installation surface 100, and in the fire detector shielding plate 16, the fixed portion 42 of the base 40 is the fire detector 10. And the installation surface 100, and are sandwiched and fixed. In this case, the base 40 has a fixing portion on the fire detector side that can be locked to the engagement fitting 22 of the fire detector 10, and a fixing portion on the installation surface side that can be fixed to the installation surface 100. There is. In this way, even when the fire detector 10 is directly fixed to the installation surface 100 without going through the mounting base 11, the fire detector shielding plate 16 is fixed between the fire detector 10 and the installation surface 100. The shielding surface portion 41 can be arranged on the side of the fire detector 10. Further, the fire detector shielding plate 16 may be integrated with the mounting base 11. In this case, the base 40 of the fire detector shielding plate 16 has a fixed portion on the installation surface side fixed to the installation surface 100, a fixed portion on the sensor side for fixing the fire detector 10, and a fire detector. A fixed portion of the wiring portion 23 electrically connected to the 10 is provided. Thereby, by mounting the fire detector shielding plate 16 on the installation surface 100 instead of the mounting base 11, the fire detector 10 can be fixed to the installation surface 100 while installing the shielding surface portion 41.

Although the embodiment of the present invention has been described above, the application of the present invention is not limited to the present embodiment and may be variously applied within the scope of the technical idea thereof. The fire detector 10 in the above-described embodiment detects smoke, but other than this, such as a fire detector that detects heat, a fire detector that detects gas, or a fire detector that combines these. A fire detector shielding plate 12 can also be attached to a type of fire detector. Further, although the above-mentioned fire detector detects the occurrence of a fire, the fire detector shielding plate 12 can also be attached to an alarm device having a notification unit that generates voice or light when a fire occurs.

10 Fire detector 11 Mounting base 12 Fire detector shield plate 20 Housing 20a Smoke inflow inlet 21 Terminal board 22 Engagement bracket 23 Wiring part 30 Main body part 31 Bottom part 32 Wiring hole part 33 Engagement metal fittings 34 Fixing hole Part 40 Base 41 Shielding surface 42 Fixed part 43 Through hole 43a Notch 44 Through hole 100 Installation surface 101 Insertion hole

Claims (6)

A shield plate for a fire detector having a shielding surface portion arranged around the fire detector fixed to the installation surface.
It has a base portion along the installation surface and the shielding surface portion rising from the base portion.
The base has a fixing portion that is sandwiched and fixed between the fire detector and the installation surface.
The base portion has a through-hole portion through which a wiring portion extending from the fire detector side to the installation surface is inserted, and the through-hole portion opens the through-hole portion in a direction parallel to the installation surface. A shield plate for a fire detector, which is characterized by having a notch . A shield plate for a fire detector having a shielding surface portion arranged around the fire detector fixed to the installation surface.
It has a base portion along the installation surface and the shielding surface portion rising from the base portion.
The base has a fixing portion that is sandwiched and fixed between the fire detector and the installation surface.
The base portion has a through hole portion through which a wiring portion extending from the fire detector side to the installation surface is inserted, and the through hole portion is continuous to one edge of the base portion. Shielding plate for detectors. The shield plate for a fire detector according to claim 1 or 2 , wherein the fixing portion is provided on the installation surface and is sandwiched between the mounting base on which the fire detector is fixed and the installation surface. .. The shield for a fire detector according to claim 1 or 2 , wherein the fixing portion abuts and is sandwiched between a mounting base provided on the installation surface and to which the fire detector is fixed and the fire detector. Board. A shield plate for a fire detector having a shielding surface portion arranged around the fire detector fixed to the installation surface.
It has a base portion along the installation surface and the shielding surface portion rising from the base portion.
The base has a fixing portion that is sandwiched and fixed between the fire detector and the installation surface.
The fixed portion is abutted and sandwiched between the fire detector and the installation surface.
The base portion has an installation surface side fixing portion fixed to the installation surface, a sensor side fixing portion for fixing the fire detector, and a fixing portion of a wiring portion connected to the fire detector. A shielding plate for a fire detector that is characterized by this. Any one of claims 1 to 5 , wherein the shielding surface portion has at least an outer shape larger than the outer shape of the image projected on the shielding surface portion when the fire detector is fixed to the installation surface. Shielding plate for fire detectors described in.

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