JP4707420B2 - Sensor dust cover - Google Patents

Description

    The present invention relates to a dust-proof cover that is attached to a sensor case to prevent a detection unit of the sensor from being soiled by dust or the like.

    The present invention also relates to a viewing angle limiting adapter that is attached to a sensor case for the purpose of limiting the monitoring space at the installation location of the sensor to a predetermined range.

    Furthermore, the present invention relates to a viewing angle adapter that also serves as a dustproof cover.

    Conventionally, a dust cover is known which is attached to, for example, a smoke detector and covers the smoke inlet in a substantially sealed state to prevent intrusion of dust and the like. The dust cover is stored in the packaging box in a state of being attached to the smoke detector.

    In general, a detector is often installed during construction of a building or the like, and is installed on a ceiling or the like with a dustproof cover attached so that the detector of the detector is not contaminated with dust or the like until the construction is completed. Then, after the construction was completed, the worker removed the dust cover from the sensor using a dedicated jig. (For example, see Patent Document 1)

Conventionally, as the viewing angle limiting adapter, for example, a coated product made of a box-shaped sheet metal part (not shown) is known. Therefore, the viewing angle limiting adapter itself is heavy, expensive, and not aesthetically pleasing.
Japanese Patent No. 2889459

As an example in which an operator attaches a dustproof cover to a sensor, a packaging process at the time of manufacturing the sensor can be given. This procedure is relatively easy to install because the operator can handle both parts at hand.
On the other hand, an example in which the worker removes the dust cover from the sensor is when the sensor is started to be monitored after the completion of construction. For example, when a low ceiling such as a general building is installed with no inclination angle, it can be removed relatively easily if an operator uses a removal jig.
However, in detectors installed at high ceilings such as an atrium or at an angle of inclination, workers on the floor must remove the dust cover from the detector even if the surroundings are dark, even if a jig is used. It is very difficult to match.

    As described above, the conventional dustproof cover has a large holding force at the time of mounting, but requires a large force at the time of removal, and a dedicated jig is used for that purpose. In particular, when removing a dustproof cover from a high ceiling such as an atrium or a sensor installed at an inclination angle, it is difficult to align the dedicated jig and dustproof cover. Has hit the sensor, causing troubles in the work.

    Further, since the conventional viewing angle limiting adapter is composed of a box-shaped steel plate product, the weight of the device is heavy, expensive, and bulky and conspicuous.

    The present invention has been made to solve the above problems, and an object thereof is to provide a dustproof cover that can be easily removed even in a sensor installed at a high ceiling or at an inclined angle.

    Another object of the present invention is to provide a viewing angle limiting adapter that is low in cost, lightweight, and excellent in aesthetics.

    Furthermore, an object of the present invention is to provide a viewing angle limiting adapter that can also be used as a dustproof cover.

The dust cover of the sensor of the present invention is provided on the inner side of the main body portion surrounding the main body portion, which has a bottomed cylindrical shape that accommodates the detection portion and case of the sensor and prevents intrusion of dust and the like, at least one or more inwardly directed projections for engaging the side hole of the sensor case periphery, the sensor of the dust cover comprising a flange portion provided radially from the outer peripheral edge of the body peripheral wall, the protrusion locked to the side holes of the sensor casing periphery, the detector of the detection portion and the dust-proof cover removal wearing to cover, the said dust cover and or or or pulling down the flange portion, wherein rotating the fit was the engagement portion between the side hole the protrusion as a fulcrum, in which the protrusion is equal to or deviating from the side hole of the sensor case.

Further, sensors of the dust cover of the present invention, prior Symbol hollowed precut portion provided can hollowed in a predetermined position of the bottom surface of the body portion, the detector of the detection unit in a state where the device on the sensor casing and Turkey to limit the monitoring range in which the features.

    The dust cover of the sensor of the present invention is not used for a dust cover, even if an operator removes the dust cover from the sensor case at a high ceiling such as an atrium or an installation place with an inclination angle. Workability can be improved because accuracy of alignment with the flange portion is not required.

    In addition, since the viewing angle limiting adapter of the sensor of the present invention is a molded product of a resin material such as polypropylene or polystyrene, the shape and display can be freely manufactured. In addition, it is lightweight and has the advantage of low cost. Therefore, by mounting the pre-cut portion on the sensor after being cut out, it can be used as a viewing angle limiting adapter that limits the monitoring space of the sensor to a predetermined range with low cost, light weight and excellent aesthetics.

    Furthermore, it can be used as a dust-proof cover during construction at the installation site, and can also be used as a viewing angle limiting adapter if the operator cuts out the pre-cut part and re-attaches it to the sensor after the construction is completed.

    FIG. 1 is a cross-sectional view showing an engaging portion between a sensor case 10 and a dust cover 1 according to an embodiment of the present invention. For example, in the case of a flame sensor that detects infrared rays emitted from a flame, the sensor case 10 has a substantially frustoconical shape, and is an inclined surface formed by a monitoring range of the flame sensor around a central transmission window. An electric circuit component including a detector (not shown) is housed inside the sensor case 10. Further, a side hole 11 for locking the dust cover 1 is provided on the outer periphery of the sensor case 10.

    The dustproof cover 1 is a molded product of a resin material and has flexibility. Therefore, the inwardly protruding portion 4 having a substantially rectangular cross section inside the peripheral wall of the main body 2 of the dust cover 1 is engaged with the substantially rectangular side hole 11 slightly larger than the protruding portion 4 of the sensor case 10, thereby preventing dust. The cover 1 is easily attached to the sensor case 10 so as to cover the detection part of the flame sensor. Although FIG. 1 shows an example in which the number of protrusions 4 is two, only one may be used.

    FIG. 2 is a side view of the dust cover 1. The dust cover 1 is composed of a body portion 2 and a flange portion 3 having a bottomed cylindrical shape.

    FIG. 3 is a front view of the dustproof cover 1. A rib 5 for increasing the rigidity of the flange portion 3 of the dust cover 1 and a guide 6 that abuts against the inclined surface of the sensor case 10 for reducing rattling during mounting are formed. Further, the fan section 7 on the front side of the main body section 2 protects a confirmation lamp (not shown) provided so as to protrude from the sensor case 10 and a base for keeping the level when the dust cover 1 is faced down. Doubles as In FIG. 3, an example in which the number of ribs 5 and guides 6 is six is shown, but it can be increased or decreased as necessary.

    When the operator attaches the dust cover 1 to the sensor case 10, the protrusion 4 provided on the inner side of the peripheral wall of the dust cover 1 is engaged with the side hole 11 of the sensor case 10.

    On the other hand, when the operator removes the dust cover 1 attached to the sensor case 10 at the installation site, the dust cover 1 is engaged with the side hole 11 and the protrusion 4 when the collar portion 3 is pushed or pulled. The protruding portion 4 starts to float from the side hole 11 of the sensor case 10 and falls off from the sensor case 10 when it comes to a position where it comes off. Further, the protruding portion 4 is disposed on the upper peripheral wall of the main body portion 2 and is in a position where it can be easily detached from the side hole 11 by the rotation operation of the dustproof cover 1.

    In the case of a sensor installed at a high ceiling or at an inclined angle and cannot be directly reached, a load is applied to the flange portion 3 of the dust cover 1 using a bar (not shown) as necessary. You can take it.

    FIG. 4 is a front view of the dust cover 1 and shows an example in which a precut portion 8 is provided at a predetermined position. Note that the precut portion 8 with perforations and the like can be easily cut out by an operator. Furthermore, the shape of the pre-cut part 8 can be arbitrarily set with respect to the required monitoring range of the flame detector. Moreover, when using only as a dust-proof cover, as a matter of course, there is no need for the pre-cut portion as shown in FIG.

FIG. 5 is a configuration diagram showing a usage example in which the precut portion 8 of the dustproof cover 1 is cut out and attached to the sensor case 10 as a cutout hole 8a to form a viewing angle limiting adapter. Here, the detector case 10 is a flame detector, and when the monitoring range of the detection unit 13 such as a pyroelectric element of the flame detector is θ ₀ , when the viewing angle limiting adapter 9 is attached, the hole 8a is cut out. Thus, the monitoring range of the detector 13 of the flame detector can be limited to θ ₁ .

It is a block diagram at the time of attaching a dust-proof cover to the sensor which is one Example of this invention. It is a side view of the dustproof cover of the present invention. It is a front view of the dustproof cover of the present invention. It is a front view at the time of providing a precut part in a dustproof cover. It is a figure which shows the monitoring range at the time of mounting | wearing the sensor with the viewing angle restriction | limiting adapter of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dust-proof cover 2 Main-body part 3 Head part 4 Protrusion 5 Rib 6 Guide 7 Fan part 8 Pre-cut part 8a Hollow-out hole 9 Viewing angle restriction adapter 10 Sensor case 11 Side hole 12 Indentation part 13 Detection part θ ₀ Flame detector monitoring range θ ₁ Monitoring range of flame detector when viewing angle restriction adapter is installed

Claims (2)

A main body with a bottomed cylindrical shape that houses the detector's detector and case and prevents dust and the like from entering, and is provided inside the peripheral wall of the main body, and is locked to the side hole on the outer periphery of the sensor case In the dustproof cover of the sensor comprising at least one or more inwardly projecting protrusions and a flange provided radially from the outer peripheral edge of the main body peripheral wall, the protrusions are associated with side holes on the outer periphery of the sensor case. sealed, the sensor of the detection portion and the dust-proof cover removal wearing to cover, the said dust cover and or or or pulling down the flange portion and fitted between the side hole and the protrusion rotating the engaging portion as a fulcrum, sensors of the dust cover the protrusions is equal to or deviating from the side hole of the sensor case.
Before SL hollowed precut portion provided can hollowed in a predetermined position of the bottom surface of the body portion, the sensing of claim 1 for limiting the monitoring range of the sensing portion of the sensor while device to the sensor casing Dust-proof cover.

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