JP6203670B2 - Sprinkler head - Google Patents

Description

  The sprinkler head includes a valve body that closes the water outlet and a thermal decomposition unit that supports the valve body. In the thermal decomposition part, a heat sensitive body that is melted by heat at the time of a fire is installed, and the thermal decomposition part is constituted by a mechanism that decomposes by melting the heat sensitive body.

  The operating temperature of solder, which is a heat sensitive body used in the sprinkler head, is generally 72 degrees, and other than that, there is a sprinkler head using a heat sensitive body that operates at a high temperature such as 96 degrees, 139 degrees, and 183 degrees. Exists.

  In general, solder is used for the heat sensitive body. For solder, a material that is not very suitable for the environment, such as lead (Pb), indium (In), and cadmium (Cd), is used. Thus, a heat-sensitive body of a sprinkler head that does not adversely affect the environment has been proposed using an inorganic compound or an organic compound instead of solder (see Patent Document 1).

JP 2005-230025 A

  Needless to say, even if an organic compound is used in place of solder as the material of the heat sensitive body, a response equivalent to or higher than that of solder is required. Specifically, the sprinkler head needs to operate in a temperature range within ± 3% of the target temperature. Further, since the sprinkler head is installed in a building or the like for a long period of time, the stability of the material itself is also required.

  Based on such demands, the inventors have conducted an intensive study. As a result, the material is melted around 73 degrees, and diphenyl phthalate is suitable as a material for a heat-sensitive material to replace solder. It has been found that 2-naphthyl benzoate is suitable as a material for a heat-sensitive material that can replace solder.

  However, in general, the sprinkler head does not use solder that melts at 60 degrees. Therefore, the sprinkler head melts at around 60 degrees and can be a material for a heat sensitive body of the sprinkler head that has both responsiveness (sensitivity) and stability. Organic compounds have not been studied.

  An object of the present invention is to obtain a sprinkler head that uses an organic compound that melts in the vicinity of 60 degrees, does not adversely affect the environment, and has excellent responsiveness and stability as a heat sensitive body.

  The present invention provides a sprinkler head comprising: a valve body that closes a water discharge port; a thermal decomposition portion that includes a cylinder and a piston that supports the valve body; and a thermal body that is accommodated in the cylinder and pressed by the piston. The heat sensitive body is formed by compression molding a fine powder of an organic compound having a melting point in the temperature range of 50 to 60 degrees to a hardness of 1.4 kg or more, and the organic compound is 1,8-octanediol or 4-chlorobenze. It is selected from hydrol.

  In the present invention, a fine powder of 1,8-octanediol or 4-chlorobenzhydrol having a melting point in the temperature range of 50 to 60 degrees as a heat sensitive material is compression molded to a hardness of 1.4 kg or more. By using the sprinkler head, the environment is not adversely affected and the sensitivity is excellent.

It is a longitudinal section of the sprinkler head concerning a 1st embodiment of the present invention. It is a perspective view of the thermal decomposition part of a sprinkler head. It is a graph of the experimental result which confirmed stability (time-dependent change amount) of the heat sensitive body which concerns on this invention. It is a graph of the experimental result which confirmed the responsiveness (sensitivity) of 1,8-octanediol which concerns on this invention. It is a graph of the experimental result which confirmed the responsiveness (sensitivity) of 4-chloro benzhydrol concerning this invention. It is a graph of the experimental result which confirmed the responsiveness (sensitivity) of solder. 7 (a) and 7 (b) are enlarged views of the heat sensitive part of the sprinkler head according to the second embodiment of the present invention.

-1st Embodiment The 1st Embodiment of this invention aims at comprising especially the heat sensitive body of the low-temperature type sprinkler head whose operating temperature is 60 degree | times with an organic compound, The heat-sensitive body of the sprinkler head according to Embodiment 1 is obtained by compression-molding a fine powder of an organic compound having a melting point in the temperature range of 50 to 60 degrees to a hardness of 1.4 kg or more. -Octanediol or 4-chlorobenzhydrol.

  Since the characteristics of the heat sensitive body are closely related to the structure of the sprinkler head, the structure of the sprinkler head will be described first, and then the heat sensitive body will be described.

<Sprinkler head structure>
FIG. 1 is a longitudinal sectional view of the sprinkler head according to the first embodiment, and FIG. 2 is a perspective view of a thermal decomposition portion. Hereinafter, the structure of the sprinkler head will be described with reference to the drawings.

  1 is a main body, and a water outlet 5 is provided at the center. And the valve seat 7 is provided in the lower end periphery of the water discharge port 5, and the water discharge port 5 is block | closed by the valve body 20. FIG.

  A cylindrical frame 10 is provided with a female screw 11 screwed into the screw portion 4 of the main body 1 at the upper portion of the outer wall, and a locking step portion 12 is formed below the female screw 11.

  Reference numeral 30 denotes an arm guide which has a substantially U-shaped cross section and is joined to the valve body 20 integrally by caulking the lower part of the valve body 20. A plate-shaped balancer 35 applies a predetermined assembly load applied to the valve body 20 evenly to the arms 41a and 41b of the thermal decomposition unit 40 when the sprinkler head is assembled.

  Reference numeral 40 denotes a thermal decomposition unit including a pair of arms 41a and 41b, an arm support plate 46, a link presser slope 55, and the like, and supports the valve body 20. Reference numeral 61 denotes a heat sensitive plate.

  Next, the thermal decomposition unit 40 will be described in detail with reference to FIG. In FIG. 2, the arms 41 a and 41 b are formed in a substantially inverted J shape, and are provided with a first locking hole 44 and a second locking hole 45. The arm support plate 46 is formed in a substantially quadrangular shape, and includes a main body 47 having a through hole 48 in the center and locking pieces 49a and 49b. The arm supporting plate 46 is disposed between the arms 41a and 41b and is locked. , 49b are locked in the first locking holes 44 of the arms 41a, 41b.

  Reference numeral 50 denotes a metal cylinder, and a collar portion 51 is provided on the outer wall. The cylinder 50 is inserted into the through hole 48 of the arm support plate 46 and is placed on the arm support plate 46 by the collar portion 51. Reference numeral 53 denotes a heat sensitive member accommodated in the cylinder 50. A heat sensitive plate 53 is screwed into the lower portion of the cylinder 50.

  The heat sensitive body 53 has a melting point in the temperature range of 50 to 60 degrees, for example, compresses a fine powder of an organic compound mainly composed of 1,8-octanediol or 4-chlorobenzhydrol to a hardness of 1.4 kg or more. It is formed by molding. The effect using such a heat sensitive body 53 is mentioned later. The heat sensitive part 53 and the heat sensitive plate 61 constitute a heat sensitive part.

  A first piston 54 is slidably accommodated in the cylinder 50 and presses the heat sensitive body 53. There is a gap S (see FIG. 7) between the first piston 54 and the cylinder 50, and the melted heat sensitive body 53 flows out of the sprinkler head from the gap S.

  Reference numeral 55 denotes a link retainer plate, which includes a main body 56 having a screw hole 57 in the center and fitting pieces 58a and 58b projecting on both sides thereof. The fitting piece 58a is disposed between the arms 41a and 41b. , 58b are loosely fitted into the second locking holes 45 of the arms 41a, 41b.

  Reference numeral 59 denotes a second piston in which a screw portion 60 provided at one end is screwed into a screw hole 57 of the link pressing plate 55 and the other end abuts on the first piston 54.

  Returning to FIG. 1, the distal ends of the arms 41 a and 41 b of the thermal decomposition unit 40 are locked to a locking step portion 12 formed of a horizontally long opening hole in the wall surface of the frame 10, and the head portion is fixed by screwing the frame 10. The pressure is reduced by the balancer 35. At this time, the arms 41a and 41b are given a rotational force in a direction to open outward (a direction away from the cylinder 50) with the engaging portion to the engaging step portion 12 as a fulcrum, and this rotational force is applied to the arms 41a and 41b. It is regulated by the stopped arm support plate 46.

Next, the operation of the sprinkler head configured as described above will be described.
When the fire is generated and the heat sensitive plate 61 is heated, and the heat sensitive body 53 is heated by the heat and the hot air current from the surroundings, the heat sensitive body 53 is softened, so the first piston 54 crushes the heat sensitive object 53. And go down. Further, when the heat sensitive body 53 starts to melt, a part of the melted heat sensitive body 53 flows out from the gap S between the cylinder 50 and the first piston 54, and accordingly, the cylinder 50 and the cylinder 50 are fixed thereto. Then, the arm support plate 46 rises, and both arms 41a and 41b rotate outward with the locking portion of the frame 10 with the locking step portion 12 as a fulcrum. As a result, the engagement between the locking holes 44 of the arms 41a and 41b and the locking pieces 49a and 49b of the arm support plate 46 is released, and the thermal decomposition unit 40 is disassembled. Thereby, the thermal decomposition part 40 and the balancer 35 including the thermal plate 61 fall outside from the opening provided on the bottom surface of the frame 10.

  At the same time, the stopper ring 31 slides down the inner wall of the frame 10 and moves so that the deflector 32 connected by the stopper ring 31 and the guide rod is positioned below the frame 10. The arm guide 30 integrated with the valve body 20 is fitted into an opening provided at the center of the deflector 32, so that the valve body 20 is seated on the deflector 32. As a result, the water outlet 5 is opened, and the fire extinguishing water passes through the frame 10 and collides with the deflector 32 to be sprinkled.

<About heat sensitive body>
Next, the heat sensitive body 53 that is a feature of the present invention will be described.
The heat sensitive body 53 is formed by compression molding a fine powder of an organic compound having a melting point in the temperature range of 50 to 60 degrees to a hardness of 1.4 kg or more. In the first embodiment of the present invention, it is assumed that the organic compound used as the heat sensitive body 53 is 1,8-octanediol (melting point 57-61 degrees) or 4-chlorobenzhydrol (melting point 58-60 degrees). However, any organic compound having crystallinity may be used. An organic compound having crystallinity has high hardness and is suitable for the heat sensitive body 53.

  When the organic compound fine powder is compression-molded, it is preferable to screen the organic compound fine powder in advance to make the particle diameter of the fine powder uniform. As a result, when compression molding is performed, the density cannot be increased or decreased, and the hardness can be stabilized. In addition, by compressing and molding without heating, moisture does not evaporate and the melting point is difficult to change, so that a compression molded body (pellet) having a melting point as designed can be obtained.

  The heat sensitive body 53 is pressed from above by the first piston 54 and the second piston 59, and an assembly load of about 50 to 100 kgf is applied. Therefore, after a long period of time, the heat sensitive body 53 is deformed (this deformation is referred to as “creep”), but if this deformation is large, the sprinkler head will operate even if it is not a fire, The creep needs to be within a predetermined range. A creep test was performed to confirm the creep of the heat sensitive body 53 of the present embodiment, which will be described below.

  In the creep test, a constant load W of about 13 times the actual link load is applied by the experimental equipment, and after a certain time has elapsed, the height of the subsequent sample is measured, and the sample is crushed by the load. This is done by measuring the amount of change over time of the reduced height h. As a sample, a fine powder of 1,8-octanediol (melting point: 57-61 degrees) and 4-chlorobenzhydrol (melting point: 58-60 degrees), which are organic compounds according to Embodiment 1 of the present invention, has a hardness of 1.4 kg. The test was carried out for a total of three types, one type of each pellet formed by compression molding and one type of solder having a melting point of 60 degrees. As test conditions, the test temperature was 20 ° C., and the link load was 13 times the assembly load defined by the Sprinkler Head Test Detailed Regulations.

  The hardness of the pellet is expressed by a peak value of the load when the pellet is collapsed by applying a load to the compression-molded pellet and gradually increasing the load.

  The creep test results are shown in FIG. In FIG. 3, the vertical axis represents the cumulative displacement amount (mm), and the horizontal axis represents the elapsed days (days).

  As shown in the graph of FIG. 3, in the sample using solder, the cumulative amount of displacement rapidly increases to about 0.2 mm to 0.25 mm before the first day, and changes with time thereafter. The amount increases, and the cumulative displacement amount is about 0.55 mm when 10 days have passed.

  On the other hand, in the present embodiment, the cumulative displacement amount is about 0.05 mm which is 1/4 or less of the solder at the time of the first day, and the temporal change amount hardly changes after that. The accumulated displacement is about 0.07 to 0.08 mm when 10 days have passed. Moreover, after 1 day, the sign of gradual increase is much smaller than that of solder.

  In compressing and molding the fine powder of the organic compound to a predetermined hardness, it is sufficient that the cumulative displacement amount at the time of 10 days in the creep test is smaller than that of the solder, for example, 0.1 mm or less, more preferably 0. It is desirable to set the hardness so as to be 08 mm or less.

  From the above test results, creep was achieved by compressing and molding the fine powder of the organic compound (1,8-octanediol or 4-chlorobenzhydrol) of the present embodiment to a hardness of 1.4 kg for the heat sensitive body 53. It turns out that becomes 1/4 or less of solder.

  Since it is necessary to prevent the sprinkler head from operating during creep, it is necessary to determine the operating conditions of the thermal decomposition unit 40 in the sprinkler head in consideration of the amount of deformation of the creep. For this reason, the fact that the creep is large requires that the operating conditions of the thermal decomposition unit 40 have a margin, and as a result, the sensitivity deteriorates.

  On the other hand, the fact that the creep is small means that the ratio considering the deformation due to the creep is reduced, so that the sensitivity can be improved accordingly.

  That is, when the fine powder of the organic compound (1,8-octanediol or 4-chlorobenzhydrol) is compression molded to a hardness of 1.4 kg and used for the heat sensitive body 53, the creep of the heat sensitive body 53 can be reduced. A sprinkler head with sensitivity can be realized.

  Further, it is necessary to set the thickness of the heat sensitive body 53 in consideration of the amount of deformation due to creep. Accordingly, the fact that the creep is large requires that the thickness of the heat sensitive body 53 be increased accordingly. When the thickness of the heat sensitive body 53 is increased, the heat capacity is increased, and the time until the heat sensitive body 53 is melted is increased, so that the sensitivity is deteriorated.

  On the other hand, the fact that creep is small means that the heat sensitive body 53 can be made thin accordingly, so that the heat capacity is small, and in this sense, the sensitivity is also improved.

  Therefore, the thickness of the heat sensitive body 53 is set thin by compressing and molding a fine powder of an organic compound (1,8-octanediol or 4-chlorobenzhydrol) to a hardness of 1.4 kg and using it as the heat sensitive body 53. In this way, a highly sensitive sprinkler head can be realized.

  Next, regarding the sensitivity in the case of using a compression-molded fine powder of 1,8-octanediol or 4-chlorobenzhydrol as the heat-sensitive body 53, the sensitivity to the sensitivity due to the thermal characteristics specific to the material of the pellet after compression molding In order to investigate the influence, a sensitivity test was performed, and this point will be described.

  In this experiment, 1,8-octanediol and / or 4-chlorobenzhydrol was used as the heat sensitive body 53, and the hardness of the sample was 1.4 kg. In the experiment, a pellet sample of 1,8-octanediol or 4-chlorobenzhydrol was heated at 1 ° C./min while applying a compression load of 500 g under a nitrogen atmosphere, and the height of the pellet at each temperature. It looks at (change).

  The test result of the sensitivity test of 1,8-octanediol is shown in FIG. 4, and the test result of the sensitivity test of 4-chlorobenzhydrol is shown in FIG. 4 and 5, the vertical axis represents the displacement (μm), and the horizontal axis represents the temperature (° C.) of the heat sensitive body 53. 4 and 5 show a state in which the temperature is in the vicinity of 55 degrees.

  As shown in FIG. 4, 1,8-octanediol has a steep inclination angle of the graph from about 53 degrees to 55 degrees. More specifically, the slope of the graph between the slope up to around 53 degrees (broken line in FIG. 4) and the melting start point a starting to separate and the constant melting end point b where the height of 1000 μm decreases is shown by the broken line in FIG. It is leaning down more rapidly. The temperature at the melting start point a and the temperature at the constant melting end point b are within a range of about 2 degrees.

  Further, as shown in FIG. 5, 4-chlorobenzhydrol has a steep inclination angle of the graph from about 55 degrees to 57 degrees. More specifically, the slope of the graph between the slope up to around 55 degrees (dashed line in FIG. 5) and the melting start point a starting to leave and the constant melting end point b where the height of 1000 μm decreases is shown by the broken line in FIG. It is leaning down more rapidly. The temperature at the melting start point a and the temperature at the constant melting end point b are within a range of about 2 degrees.

  These mean that pellet samples of 1,8-octanediol and 4-chlorobenzhydrol are melted at once when melting starts, which means that the sensitivity as a sprinkler head is good. Thus, when the fine powder of 1,8-octanediol and 4-chlorobenzhydrol was compression molded and used for the heat sensitive body 53, it was confirmed that the sensitivity was good.

  If the hardness is too low, the thermosensitive material will melt slowly within a large temperature range, and therefore the sensitivity will be poor when used in a sprinkler head.

  In FIGS. 4 and 5, it is most ideal that the inclination angle of the graph is abrupt, that is, the inclination angle is 90 degrees so that the displacement amount drops almost vertically at a specific temperature. At least, it is desirable that the heat sensitive body used for the sprinkler head is approximately the same as or more abrupt than the inclination angle of the solder that melts at 60 degrees.

  The test result of the sensitivity test for the solder having a melting point of 60 degrees is shown in FIG. As shown in FIG. 6, the temperature of the solder is about 57 degrees to 60.5 degrees, and the inclination angle of the graph is steep. More specifically, the slope of the graph between the slope up to around 57 degrees (broken line in FIG. 6) and the melting start point a starting to separate from the constant melting end point b where the height of 1000 μm decreases is shown by the broken line in FIG. It is leaning down more rapidly. The temperature at the melting start point a and the temperature at the constant melting end point b are within the range of about 3.5 degrees.

  As described above, by using the fine powder of 1,8-octanediol or 4-chlorobenzhydrol as the heat-sensitive body 53 that is compression-molded so as to have a hardness of 1.4 kg or more, the creep is reduced and the sensitivity is reduced. Can be high. Moreover, when using for the heat sensitive body 53 which compression-molded the fine powder of 1,8-octanediol or 4-chlorobenzhydrol, it has also confirmed that the one where the hardness of the heat sensitive body 53 is higher can make a sensitivity high.

  From these facts, the heat-sensitive body 53 obtained by compression molding a fine powder of 1,8-octanediol or 4-chlorobenzhydrol is melted at a stretch and has high sensitivity, and hardness when used for the heat-sensitive body 53 of the sprinkler head. As a result, it was confirmed that a hardness of 1.4 kg or more is preferable.

  In addition, the hardness when compression molding a fine powder is preferably as high as possible, but if the hardness is too high, the mold used for compression molding may be damaged, so the upper limit of hardness is as follows: For example, the hardness is set to 1.4 to 4.0 kg. Moreover, the load at the time of compression molding of the fine powder of the organic compound is, for example, 5 to 10 kN, and the hardness when the organic compound is compression-molded with this load is 1.4 kg or more. It can also be said that the load is suitable for molding.

  In Embodiment 1, 1,8-octanediol or 4-chlorobenzhydrol is exemplified as the organic compound. However, the organic compound has a melting point in the temperature range of 50 to 60 degrees, and the organic compound When the above-mentioned fine powder is compression molded to a hardness of 1.4 kg or more, the cumulative displacement amount in the above-described creep test is smaller than that of the solder, and the inclination angle of the displacement amount curve with respect to the temperature shown in FIG. Other organic compounds may be used as long as they rapidly melt within a narrow temperature range that can be accommodated in the inside. The rapid melting means that the temperature at the melting start point a and the temperature at the constant melting end point b are within a range of 3.5 degrees equivalent to that of solder that melts at 60 degrees, for example. Moreover, since these organic compounds are organic compounds used for sprinkler heads, it is needless to say that they must be organic compounds that are sparingly soluble in water.

Embodiment 2
With reference to Fig.7 (a), the invention which concerns on Embodiment 2 of this invention is demonstrated below. The second embodiment of the present invention differs from the first embodiment in the configuration of the heat sensitive body 53, and the basic configuration of the other sprinkler heads and the operation during a fire are the same. Therefore, in the second embodiment, the heat-sensitive body 53 which is a difference from the first embodiment will be described in detail, and the members corresponding to the first embodiment will be described with the same reference numerals. Omitted.

  In the second embodiment according to the present invention, as shown in FIG. 7A, which is an enlarged view of the heat sensitive part of the sprinkler head, a covering member 52 made of flat solder is provided on the upper surface of the heat sensitive body 53. More specifically, the covering member 52 has an outer diameter substantially equal to the inner diameter of the cylinder 50, and the outer peripheral surface of the covering member 52 is in contact with the outer peripheral surface of the cylinder 50. That is, a covering member 52 is provided between the gap S formed between the cylinder 50 and the first piston 54 and the heat sensitive body 53 so as to close the gap S, and the heat sensitive body 53 made of an organic compound is exposed to the outside air. It is configured not to come into contact with.

  Solder has a property superior to that of an organic compound as a heat-sensitive body. With the above-described configuration, the excellent characteristics of solder can be combined with the characteristics of the heat-sensitive body 53 made of an organic compound. In addition, the characteristic as a heat-sensitive body in which solder is superior to an organic compound includes a property (chemical resistance) that is difficult to dissolve in an organic solvent such as alcohols, acetone, benzene, and toluene. In addition, with the above configuration, the covering member 52 seals the heat sensitive body 53 made of an organic compound in the cylinder 50, so even if it is an unstable substance that causes the organic compound to sublime, It can be used as the heat sensitive body 53.

  Further, combining the solder characteristics with the heat sensitive body 53 is not limited to the configuration in which the covering member 52 is provided between the heat sensitive body 53 and the gap S as described above. For example, as shown in FIG. 7B, the heat sensitive body 53 made of an organic compound may be entirely covered with a covering member 52 made of solder. Even in this case, as described above, the characteristics of the organic compound and the solder can be combined, and an unstable organic compound can be used as the heat sensitive body 53.

  In the embodiment according to the present invention, the thermal decomposition unit 40 is described as a sprinkler head composed of arms 41a and 41b. May be a sprinkler head having another configuration. For example, a sprinkler head of a type in which a cylinder for accommodating a heat sensitive body is provided at the upper part of the piston and the piston presses the heat sensitive body from the lower part may be used. Even in the case of this type of sprinkler head, there is a gap S through which the heat sensitive member 53 flows out between the cylinder and the piston, so that the heat sensitive member 53 may be covered as described above, or between the cylinder and the piston. A flat solder may be provided between the gap S and the heat sensitive body 53. By doing in this way, the advantageous characteristic of solder can be combined with the thermal body 53, without the thermal body 53 contacting with external air.

1 Body, 4 Screw part, 5 Water outlet, 7 Valve seat, 10 Frame, 11 Female thread, 12 Flange part, 20 Valve body, 30 Arm guide, 35 Balancer, 40 Thermal decomposition part, 41a, 41b Arm, 44 1st Locking hole, 45 second locking hole, 46 arm support plate, 47 main body, 48 through hole, 49a, 49b locking piece, 50 cylinder, 51 collar portion, 52 covering member, 53 heat sensitive body, 54 first Piston, 55 link presser plate, 56 main body, 57 screw hole, 61 heat sensitive plate, 58a, 58b fitting piece, 59 second piston, 60 threaded portion, a melting start point, b constant melting end point, S clearance.

Claims (4)

In a sprinkler head comprising a valve body that closes a water discharge port, a thermal decomposition part having a cylinder and a piston that supports the valve body, and a thermal body that is accommodated in the cylinder and pressed by the piston,
The heat sensitive body is formed by compression molding a fine powder of an organic compound having a melting point in the temperature range of 50 to 60 degrees to a hardness of 1.4 kg or more,
The sprinkler head, wherein the organic compound is selected from 1,8-octanediol or 4-chlorobenzhydrol.   A flat solder is provided between the gap formed between the piston and the cylinder and the heat sensitive body so as to block the gap and prevent the heat sensitive body from coming into contact with the outside air. The sprinkler head according to claim 1.   The sprinkler head according to claim 1, wherein the heat sensitive body is coated with solder. The sprinkler head according to any one of claims 1 to 3, wherein the organic compound has a melting start point and a constant melting end point within a range of 3.5 degrees.