JP2007252745A - Sprinkler head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To acquire a sprinkler head achieving an increase in strength of a thermosensitive plate of the undermost layer which is easily affected by outer force. <P>SOLUTION: In the sprinkler head SP having a plurality of thermosensitive plates 38a, 38b at the lower end of a main body 1 of the head, the thermosensitive plate 38b provided at the undermost layer is formed into a waveform on the cross section, is thick, and has a strength greater than the thermosensitive plate 38a provided above the thermosensitive plate 38b. The thermosensitive plates are protruded on the peripheral surface of a cylinder housing a thermosensor and are the horizontal thermosensitive plates mutually facing through a thermal air flow space. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

    The present invention relates to a sprinkler head provided in a fire extinguishing facility, and more particularly to a sprinkler head having a plurality of heat sensitive plates.

    A conventional sprinkler head has a structure in which solder, which is a heat sensitive portion, is provided at the lowermost end of the head in order to increase sensitivity. The solder is accommodated in a cylinder, and two heat sensitive plates are provided on the outer peripheral surface of the cylinder at intervals in the vertical direction. The heat sensitive plate functions to efficiently transfer the heat around the sprinkler head to the solder and promote the heating of the solder. The heat sensitive plate is formed from a very thin metal plate (for example, a thickness of 0.3 mm) in consideration of heat receiving efficiency (for example, refer to Patent Document 1).

Utility Model Registration No. 2529259

    As described above, the conventional heat sensitive plate is composed of a thin metal plate and is provided at the lowermost end of the head, so it deforms when an excessive force is applied during installation of the sprinkler head. End up. Such deformation of the heat sensitive plate lowers the sensitivity of the head, so that the specification sensitivity cannot be maintained. In other words, in the conventional example, when the lowermost (lowermost layer) thermal plate is deformed so as to be bent upward, there is no gap (thermal air space) between the two thermal plates, and the horizontal plate that enters from the gap is removed. Since the hot air current does not hit the solder, the sensitivity of the head decreases. Similarly, even if the two thermal plates are deformed so that the distance between them is increased, the sensitivity of the head decreases.

    It is an object of the present invention to obtain a sprinkler head that is easily affected by external force and has an enhanced strength of the lowermost thermal plate.

    The present invention relates to a sprinkler head having a plurality of heat-sensitive plates at the lower end of the head body; the heat-sensitive plate provided in the lowermost layer has higher strength than the heat-sensitive plate provided thereon. To do.

    The heat sensitive plate provided in the lowermost layer portion of the present invention is characterized by being formed in a cross-sectional waveform. The heat sensitive plate provided in the lowermost layer portion of the present invention is characterized in that the plate thickness is larger than that of the heat sensitive plate provided thereon. The heat sensitive plate of the present invention is characterized in that it is a horizontal heat sensitive plate that protrudes from the outer peripheral surface of a cylinder containing a heat sensitive body and faces each other via a thermal airflow space.

    Since the heat sensitive plate provided in the lowermost layer portion of the present invention has a higher strength than the heat sensitive plate provided thereon, an external force may be applied by an operator's hand when the head is attached. It will not be deformed even if it touches the heat sensitive plate. Therefore, since the space | interval (thermal airflow space) between thermal plates can be maintained at the set magnitude | size, the sensitivity of a head does not fall. In particular, when the heat sensitive plate provided in the lowermost layer is formed in a corrugated cross section, it is possible to increase the strength without reducing the heat receiving effect as compared with the case where the plate thickness is increased.

In order to achieve the above-mentioned object, the present inventor has the function of the heat-sensitive plate and the function of the protective plate as the heat-sensitive plate in the lowermost layer among the plurality of heat-sensitive plates arranged in a hierarchy. We thought that it should be done and repeated experimental research. As a result, it was found that the heat-sensitive plate in the lowermost layer portion should have a higher strength than the heat-sensitive plate provided thereon.
As a specific method, the lowermost layer thermal plate is made thicker than the other thermal plates, or the lowermost layer thermal plate is formed in a cross-sectional wave shape.

A first embodiment of the present invention will be described with reference to FIG.
The main body 1 of the sprinkler head SP is provided with a water outlet 3, and a flange 5 is provided below the water outlet 3. A cylindrical frame 7 is screwed to the flange 5, and a slit 9 for adjusting the load is provided in the frame 7. The tubular frame 7 is provided with a thermal decomposition portion S.

    13 is a deflector, 15 is a valve body for closing the water discharge port 3, 17 is an arm guide base plate, 19 is a pair of guide pieces provided on both sides in the longitudinal direction of the base plate 17, and 21 is a first arm 23 and a second guide piece. The balancer is supported by the arm 25, and the convex portion of the valve body 15 is in contact with the central concave portion of the balancer 21. Reference numeral 27 denotes a link presser plate, 29 denotes a bowl-shaped heat receiving plate, and 30 denotes an arm support plate.

    The heat receiving plate 29 is sandwiched between the first cylinder 31 and the second cylinder 33. The first cylinder 31 stores a heat sensitive body, for example, solder 35 that melts at 72 ° C., and a piston 37 is overlaid on the upper surface of the solder 35. The piston 37 is pressed by a piston rod 39. The front end portion of the piston rod 39 is formed in a truncated cone shape, and the rear end portion thereof is screwed to the presser plate 27. The upper portion of the first cylinder 31 is an enlarged diameter portion, and the fitting portion of the second cylinder 33 is inserted into the enlarged diameter portion.

    On the outer peripheral surface of the cylinder 31, two upper and lower horizontal heat sensitive plates 38a and 38b are provided with an interval W (thermal airflow space) in the axial direction, for example, 1.5 mm to 3 mm. The heat-sensitive plates 38a and 38b have the same diameter, for example, 19 mm. The plate thickness of the heat-sensitive plates 38a and 38b is t = 0. 3 mm for the upper heat-sensitive plate 38a and t1 = 0. It is. The lower layer heat sensitive plate 38b is formed to a thickness that can function as a heat collecting plate and a protective plate, and the value is appropriately selected within a range of 0.35 mm to 1.0 mm, for example.

    Since the upper thermal plate 38a is protected by the lower thermal plate 38b, the plate thickness can be made as thin as possible to increase the sensitivity. The heat sensitive plates 38a and 38b may be molded by a press manufacturing method, but are manufactured as a single piece by cutting.

Next, the operation of this embodiment will be described.
When an impact is applied to the heat sensitive plate, the external force is applied to the heat sensitive plate 38b in the lowermost layer portion. However, the heat sensitive plate 38b in the lower layer portion is thick, so that it is difficult to deform. Therefore, the distance between the opposing heat sensitive plates 38a, 38b (thermal airflow space) does not change, so that the specification sensitivity can be maintained.

    In this sprinkler head SP, when a fire occurs, the solder 35 is melted by fire heat. Then, the piston 37 slides, the first arm 23 and the second arm 25 of the thermal decomposition part S are removed, and the balancer 21 supporting the valve body 15 is removed, and the thermal plates 38a and 38b and the valve body 15 are removed. Etc. fall, the water outlet 3 opens and water discharge is started.

A second embodiment of the present invention will be described with reference to FIG. 2. The same reference numerals as those in FIG. 1 have the same names and functions.
The difference between this embodiment and the first embodiment is that three heat sensitive plates are provided and the plate thicknesses are different. The plate thickness t2 of the heat sensitive plates 38a and 38c is 0.2 mm, and the plate thickness t1 of the heat sensitive plate 38b in the lowermost layer is 0.5 mm. It should be noted that the plate thickness of the heat sensitive plates 38a and 38c in the upper layer portion is not necessarily the same.

A third embodiment of the present invention will be described with reference to FIG. 3. The same reference numerals as those in FIG. 1 have the same names and functions. The difference between this example and Example 1 is that the heat-sensitive plate 38b in the lowermost layer portion is formed with an annular unevenness continuously in a cross-sectional waveform. Thickness t3 of the heat sensitive plates 38b is the same as the thickness t of the heat sensitive plates 38a of the upper layer, for example, t ³ = 0.3 mm.
Thus, when making a heat sensitive board into a cross-sectional waveform, intensity | strength can be raised, without reducing a heat receiving effect compared with the case where plate | board thickness is enlarged.

    In this embodiment, instead of increasing the plate thickness, only the heat-sensitive plate in the lowermost layer is subjected to a plating process such as nickel chrome plating so that the thickness of the heat-sensitive plate is increased by the thickness of the plating. Also good.

    Further, the heat-sensitive plate in the lowermost layer portion may be subjected to a surface treatment such as sand blasting so that it has a satin finish to increase the strength. In such a case, as in Example 3, the strength can be increased without increasing the plate thickness, so that the heat receiving effect does not decrease.

    Moreover, you may make it form the heat-sensitive board of a lowermost layer part with the material which has intensity | strength higher than the heat-sensitive board provided on it. In addition, although the outer diameter of the upper and lower heat sensitive plates was described using the same diameter, the outer diameter of the heat sensitive portion in the lowermost layer portion is made larger than the outer diameter of the heat sensitive plate provided thereon. Anyway.

It is a longitudinal cross-sectional view which shows Example 1 of this invention. It is a longitudinal cross-sectional view which shows Example 2 of this invention. It is a longitudinal cross-sectional view which shows Example 3 of this invention.

Explanation of symbols

1 Head body 38a Thermal plate 38b Thermal plate in the lowermost layer SP Sprinkler head

Claims (4)

In a sprinkler head having a plurality of heat sensitive plates at the lower end of the head body;
The sprinkler head, wherein the heat sensitive plate provided in the lowermost layer portion has higher strength than the heat sensitive plate provided thereon.     The sprinkler head according to claim 1, wherein the heat sensitive plate provided in the lowermost layer portion is formed in a corrugated cross section.     2. The sprinkler head according to claim 1, wherein the heat sensitive plate provided in the lowermost layer has a larger thickness than the heat sensitive plate provided thereon.     The said thermal plate is a horizontal thermal plate which protrudes from the outer peripheral surface of the cylinder which accommodated the thermal body, and opposes each other via a thermal airflow space, The Claim 1, 2, or 3 characterized by the above-mentioned. Sprinkler head.

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