Flame detector operation test device

Abstract

The present invention provides an operational testing device for flame detectors that can prevent damage to the lens caused by uneven temperature distribution in different locations. [Solution] An operational test device for a flame detector is provided with a light-emitting unit equipped with a lamp (31) and a lens unit having a lens (23) positioned in front of the light-emitting unit, and a main body case that houses a power supply unit and a light-emitting drive unit for the lamp, and is capable of irradiating light of a predetermined wavelength in a certain direction, wherein the lens unit (12) comprises a cylindrical lens cover (24) that holds the lens and is attached to the front of the main body case, and an annular lens retaining member (21) for fixing the lens to a predetermined part of the lens cover, and the lens is fixed by having its outer edge sandwiched between the front inner edge of the lens cover and the outer edge of the lens retaining member, and an O-ring (26) is interposed between the outer edge of the lens and the front inner edge of the lens cover.

Claims

1. A flame detector operation test device is provided, comprising a main body case that houses a power supply unit and a light-emitting unit for the lamp, and which is capable of irradiating light of a predetermined wavelength in a certain direction, with a light-emitting unit equipped with a lamp and a lens unit positioned in front of the light-emitting unit at the front, The aforementioned lens portion is A cylindrical lens cover that holds the lens and is attached to the front of the main body case, The lens is provided with an annular lens retaining member for fixing the lens to a predetermined part of the lens cover, The lens is fixed by having its outer edge sandwiched between the inner front edge of the lens cover and the outer edge of the lens retaining member. An operational test device for a flame detector, characterized in that an O-ring is interposed between the outer edge of the lens and the inner front edge of the lens cover.

2. The flame detector operation test device according to claim 1, characterized in that an annular heat-insulating spacer is interposed between the outer edge of the lens and the outer edge of the lens retaining member.

3. The flame detector operation test device according to claim 2, characterized in that the lens is fixed with a gap between the outer circumference of the lens and the inner surface of the lens cover, such that its outer diameter is set to be smaller than the inner diameter of the corresponding part of the lens cover.

4. The lamp has an opening through which it can be inserted, and is equipped with a bowl-shaped reflector that reflects the light emitted by the lamp forward. The reflector's outer edge is sandwiched between the inner front edge of the lens cover and the outer edge of the lens retaining member, together with the outer edge of the lens. The flame detector operation test device according to claim 3, characterized in that the spacer is interposed between the outer edge of the reflector and the outer edge of the lens.

5. Near the outer circumference of the lens on the inner surface of the lens cover, a right-angle step portion is formed, which has a smaller diameter at the front and a larger diameter at the rear, forming a circular shape when viewed from the front. The spacer is located at the front portion, which has a smaller diameter than the right-angle step portion. The flame detector operation test device according to claim 4, characterized in that the lens retaining member has its outer edge sandwich the outer edge of the reflector between itself and the vertical wall of the right-angle step, thereby fixing the lens with a gap between the front surface of the outer edge of the lens and the inner front edge of the lens cover.

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