JP3608653B2 - Damper fuse and fire protection damper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a thermal fuse for a fireproof damper.
[0002]
[Prior art]
When the temperature inside the duct reaches a temperature at which the safety of disaster prevention is suspected, the damper is equipped with a damper plate that blocks the inside of the duct against the outside air and spreads the building. It plays an important role in disaster prevention, such as preventing the above, and the relevant standards stipulate its installation standards. With this fire damper, it is a thermal fuse that senses an abnormal temperature rise in the duct.
[0003]
As conventional techniques of such a thermal fuse, for example, those shown in Japanese Utility Model Laid-Open Nos. 61-133056 and 6-1712 are known. Each of these thermal fuses has a generally T-shaped overall shape, and heat detection in the duct is performed by the upper piece of the T-shape, and a bipod-shaped vertical fuse located at the approximate center of the upper piece. One part engages with the damper plate to keep its open state. One of the advantages common to these thermal fuses is that an excellent thermal sensing performance can be exhibited because the area of the upper piece portion that performs thermal sensing is large.
[0004]
[Problems to be solved by the invention]
On the other hand, these thermal fuses have a large area of the upper piece that performs heat sensing in order to enhance the heat sensing performance, so that the upper pieces are connected to the left and right ventilation passages of the damper plate in the fire-proof damper when mounted on the damper plate. The part protrudes greatly. Originally, since the fire prevention damper has a damper plate that inhibits pressure loss interposed in the air passage, the pressure loss during normal use is large accordingly. Therefore, other factors that inhibit the pressure loss should be eliminated as much as possible. However, in the conventional thermal fuse, the area of the upper piece portion is large and protrudes greatly to the left and right air passages, so this is a factor that inhibits the pressure loss. It still remained.
[0005]
Further, in the fire damper, the melting temperature of the temperature fuse to be used is regulated by related laws and the like depending on whether the indoor side terminal of the duct communicates with a fire use room such as a kitchen. Therefore, for example, when the indoor terminal of the duct leads to a fire use room such as a water heater room or a kitchen and the exhaust temperature exceeds 72 ° C., a temperature fuse having a melting temperature of about 120 ° C. is used. When it is connected to the other room, a thermal fuse having a melting temperature of about 72 ° C. is used. However, for the reasons of production efficiency and cost, when temperature fuses with different melting temperatures have the same external shape, it is customary to distinguish the difference in melting temperature with the markings attached to each temperature fuse. For this reason, when attaching a thermal fuse that is often used in a dark place, an operator may mistake the markings and attach a thermal fuse having a different melting temperature to the fireproof damper.
[0006]
The present invention has been made against the background of the prior art as described above. That is, an object of the present invention is to provide a damper fuse and a fireproof damper with a small number of protrusions of the fireproof damper to the air passage. Another object of the present invention is to make it possible to reliably distinguish between thermal fuses having different melting temperatures.
[0007]
[Means for Solving the Problems]
Therefore, in order to achieve these objects, the present invention forms two fuse fittings in a substantially L shape with respect to a damper fuse to be attached to a damper plate of a fireproof damper having two damper plates facing each other in the open state. In addition, with a holding gap that can hold the damper plate of the fire-proof damper between the hook portions that are substantially L-shaped horizontal pieces, the base portions that are substantially L-shaped vertical pieces are connected to each other by a heat sensitive material. And a fastener that has an engagement hole that engages with a hook portion of the thermal fuse and is fixed to the damper plate .
[0008]
Temperature fuse constituting the damper fuse of the present invention, two fuses metal is formed into a substantially L-shaped, narrow as possible hold the damper plate which is formed between the hook portions to each other is a crosspiece of substantially L-shaped While maintaining the basic function of the thermal fuse that keeps the damper plate open in the holding gap, the bases, which are approximately L-shaped vertical pieces, are attached to each other by heat sensitive material, and are attached to the damper plate. Thus, it is substantially the size of one fuse fitting that protrudes into the air passage inside the fireproof damper. Therefore, the ventilation performance during normal use can be improved as compared with the conventional thermal fuse. In addition, the damper fuse of the present invention includes an engagement hole that engages with a hook portion of the thermal fuse and is fixed to the damper plate. For this reason, even if the heat sensitive material melts and the damper plate closes, the fuse fitting does not scatter with the hook portion engaged with the engagement hole. Therefore, the scattered fuse fitting does not impair the complete blockage of the damper plate.
[0009]
The damper fuse of the present invention is configured such that the fastener is fixed to the plate surface on the opposite side of one damper plate facing the plate surface in the open state. According to this, since the fastener is originally attached between the opposing damper plates that do not contribute to ventilation, the fastener does not become an impediment to pressure loss. Further, the damper fuse of the present invention is configured such that the hook portion of the fuse fitting and the engagement hole of the fastener are formed in different shapes for each temperature fuse and fastener having different melting temperatures of the heat sensitive material. . According to this , for example , even if a hook part of a temperature fuse having a melting temperature of 72 ° C. is engaged with an engagement hole of a fastener corresponding to a temperature fuse having a melting temperature of 120 ° C., the shape is not suitable, so Cannot be engaged. Therefore, the misuse of the thermal fuse can be surely prevented. The “different shape” refers to a case in which the shape of the hook portion and the engagement hole is different for each temperature fuse and fastener having different melting temperatures of the heat sensitive material, or the hook portion and the engagement hole. Even if the shape itself is the same, both the case where the size of the shape is different for each temperature fuse and fastener are included. Further, the damper fuse of the present invention is configured as an engagement piece having spring elasticity formed on a hook portion of a fuse fitting to be engaged with an engagement hole of a fastener. According to this, since a force exceeding the spring elasticity of the engagement piece does not act, it cannot be removed from the engagement hole, so that the fuse fitting is not easily detached even if the damper plate is closed.
[0010]
Furthermore, the present invention includes a cylindrical main body, two damper plates that are axially supported so that the plate surfaces face each other in the cylindrical axis direction of the cylindrical main body in an open state inside the cylindrical main body , The fuse fittings are formed in a substantially L shape, and the base portions that are the L-shaped vertical pieces are provided with a holding gap that can hold the damper plate between the hook portions that are the L-shaped horizontal pieces. A thermal fuse that is superposed inside and outside with a heat-sensitive material that melts at a predetermined temperature, and an engagement hole that engages with a hook portion of the thermal fuse, and the opposite side of one damper plate that faces in the open state And a hook that is attached to the plate surface of the outer fuse, and the hook portion of the outer fuse fitting is engaged with the engagement hole of the fastener, and the hook portion of the inner fuse fitting is engaged with the opposite back side of the other damper plate. A fire damper that is in contact with the plate surface and maintains the open state of both damper plates I will provide a.
[0011]
If the thermal fuse is simply brought into contact with the damper plate, when the thermal material of the thermal fuse is melted, the fuse fittings are scattered by the closing operation of the damper plate, and the damper plate and cylinder that are about to close May be caught between the inner wall of the main body. However, according to the fire-proof damper of the present invention, the outer fuse fitting which attaches the fastener to the opposite plate surface of one of the damper plates opposed to each other and forms a thermal fuse with respect to the engagement hole of the fastener Even if the thermal material of the thermal fuse is melted and the damper plate is closed, the outer fuse fittings are still scattered in the engagement holes of the fasteners. Absent. Therefore, it is possible to prevent such a problem that the outer fuse fittings scattered by receiving the closing operation of the damper plate are sandwiched between the damper plate and the cylindrical main body and cannot completely block the air passage. it can. In addition, since the fastener is attached to the plate surface on the opposite side of one of the damper plates facing each other in the open state, that is, originally to a portion that does not contribute to ventilation, pressure loss is caused by attaching the fastener to one of the damper plates. There is no inhibition. Further, in this fireproof damper, the hook portion of the inner fuse fitting is brought into contact with the plate surface on the opposite back side of the other damper plate opposed in the open state, and the open state of the damper plate is maintained. For this reason, compared with the case where the temperature fuse which clamps both the damper plates of an open state from the board surface of an opposing back side is used, the clamping space | interval of a hook part can be shortened. Accordingly, since the fixing area of the two fuse fittings made of the heat sensitive material can be expanded as much as the holding interval can be shortened, the heat sensing performance can be improved and the biasing means such as a coil spring can be constantly biased in the closing direction. The holding force with respect to the open damper plate can also be increased.
[0012]
The fire damper according to the present invention is configured such that the hook portion of the fuse fitting and the engagement hole of the fastener are formed in different shapes for each temperature fuse and fastener having different melting temperatures of the heat sensitive material. According to this, if the melting temperature is different, the hook portion and the engagement hole do not coincide with each other in shape and cannot be physically engaged, so that it is possible to reliably prevent the use of an erroneous temperature fuse. The “different shape” has the same meaning as in the damper fuse according to the present invention.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0014]
Configuration of Thermal Fuse 1 According to the Present Embodiment ; As shown in FIGS. 1 and 2, the thermal fuse 1 according to this embodiment has two relative-shaped fuse fittings 2 and 3 superposed on the inside and outside, and the melting temperature is Celsius. It is fixedly formed by solder 4 as a “heat sensitive material” at 120 ° C. The fuse fittings 2 and 3 are formed with base portions 2a and 3a corresponding to a substantially L-shaped vertical piece portion and hook portions 2b and 3b corresponding to a substantially L-shaped horizontal piece portion.
[0015]
The base portion 2a of the inner fuse fitting 2 is formed slightly shorter as a shape corresponding to the inner side surface of the base portion 3a of the outer fuse fitting 3 so as to overlap and fit into the base portion 3a of the outer fuse fitting 3. Two contact portions 2c are formed on the hook portion 2b bent from the base portion 2a, and are in point contact with the damper plate 6 of the fireproof damper 5 which is open as shown in FIG. It comes to engage with. The fuse fitting 2 is formed with a bulging portion 2d and a side wall 2e for reinforcement from the base portion 2a to the hook portion 2b.
[0016]
An engagement piece 3c is formed in the hook portion 3b bent from the base portion 3a of the outer fuse fitting 3 by partially folding back the tip of the hook portion 3b in a “h” shape. The engagement piece 3c is provided with spring elasticity, and when engaged with the engagement hole 8a of the fastener 8 attached to the damper plate 7 (see FIG. 3), the engagement piece 3c is pressed slightly against the hole edge to be slightly compressed. It engages in the state bent in the direction, and when it is engaged, it is restored and completely engaged with the engagement hole 8a. The hook portion 3b is formed with a width w1 slightly shorter than the width w2 of the engagement hole 8a so that the hook portion 3b can be engaged with the engagement hole 8a with almost no gap. The fuse fitting 3 is formed with a bulging portion 3d and a side wall 3e for reinforcement from the base portion 3a to the hook portion 3b.
[0017]
The inner fuse fitting 2 and the outer fuse fitting 3 configured as described above are provided with solder 4 in a state in which a holding gap d is provided between the hook portions 2a and 3a so that the damper plate 6 can be held. Are fixed together.
[0018]
Structure of fireproof damper 5 ; The fireproof damper 5 to which the thermal fuse 1 having the above structure is attached is a so-called butterfly damper as shown in FIG. 4, and is uniaxially supported inside a cylindrical body 9 via a support shaft (not shown). The two semicircular damper plates 6 and 7 are provided, and these damper plates 6 and 7 are always urged in the closing direction Dc by a coil spring 10 as urging means. FIG. 4 shows the open state of the damper plates 6, 7. In this open state, a fixed portion 8 b fixed to the damper plate 7 is provided on the plate surface 7 a on the opposite side of the damper plate 7 that faces the damper plate 6. And the fastener 8 in which the engaging part 8c bent at right angle from the fixing | fixed part 8b is formed is attached. The fastener 8 and the thermal fuse 1 constitute a damper fuse according to the present invention .
[0019]
Action and Effect of Thermal Fuse 1 etc. According to the thermal fuse 1 of this example, a clamping gap that can clamp the damper plate 6 formed between the hook portions 2 b and 3 b of the two fuse fittings 2 and 3. At d, the basic function of the thermal fuse 1 for maintaining the open state of the damper plate 6 is satisfied, and the base portions 2a and 3a are overlapped and fixed by the solder 4 inside and outside, so that they are attached to the damper plates 6 and 7. Thus, only the size of the outer fuse fitting 3 protrudes into the ventilation path inside the fireproof damper 5. Therefore, the ventilation performance during normal use can be improved as compared with the conventional thermal fuse. Further, since the engagement piece 3c having spring elasticity is formed at the tip of the hook portion 3b of the outer fuse fitting 3, even if the temperature fuse 1 is pulled out from the fastener 8 from the engagement state shown in FIG. The piece 3c is not easily detached by being caught by the hole edge of the engagement hole 8a.
[0020]
Further, according to the thermal fuse 1 and the fastener 8 of this example, the width w1 of the hook portion 3b and the width w2 of the engagement hole 8a are formed in a corresponding size, and therefore, shown by a two-dot chain line in FIG. For example, even if an attempt is made to engage the hook portion 3b ′ of another thermal fuse 1 ′ having a melting temperature of 72 ° C. into the engagement hole 8a of the fastener 8, the width w3 of the hook portion 3b ′ is engaged. Since it is larger than the width w2 of the hole 8a, it cannot be physically engaged. As described above, the temperature fuse 1 having a solder melting temperature of 120 ° C. and the temperature fuse 1 having a melting temperature of 72 ° C. have the same shape, but the hook portions 3b and 3b are different depending on the difference in melting temperature. And the engagement holes 8a of the fastener 8 have shapes (widths) corresponding to the widths w1 and w3 of the hook portions 3b and 3b '. Misuse can be reliably prevented.
[0021]
In the fire damper 5 of this example, the fastener 8 is attached to the plate surface 7a on the opposite side of the damper plate 7 of the damper plates 6 and 7 that are opposed to each other in the open state, and the outer fuse fitting is attached to the engagement hole 8a. 3 is engaged with the hook portion 3b. Therefore, even if the solder 4 is melted and the damper plates 6 and 7 are closed due to the bias of the coil spring 10, the outer fuse fitting 3 remains engaged with the fastener 8 attached to the damper plate 7. Since there is no scattering, it is possible to prevent a situation in which the scattered fuse fitting 3 is sandwiched between the damper plates 6 and 7 and the inner wall of the cylindrical main body 9 and the damper plates 6 and 7 cannot be completely closed. In addition, since the fastener 8 is located between the damper plates 6 and 7 that originally do not contribute to ventilation in the opened state, the pressure loss of the fire damper 5 is inhibited by the fastener 8 attached to the damper plate 7. Nor.
[0022]
And about the said fireproof damper 5, while attaching the fastener 8 to the board surface 7a of the damper board 7, the hook part 3b of the outer fuse metal fitting 3 is engaged here, and the board surface 6a of the opposing back side of the damper board 8 is used. On the other hand, the contact portion 2c of the hook portion 2b of the inner fuse fitting 2 is engaged by point contact. Therefore, for example, as compared with the case where both of the damper plates 6 and 7 are sandwiched by the thermal fuses from the opposite back side plate surface, the sandwiching gap d between the hook portions 2b and 3b can be shortened. it can. Accordingly, since the fixing area of the fuse fittings 2 and 3 by the solder 4 can be increased as much as the holding gap d is short, the heat sensing performance can be improved and the coil spring 10 is constantly urged in the closing direction Dc. The holding force of the damper plates 6 and 7 can be increased.
[0023]
Modified example of embodiment: As a means for preventing misuse of temperature fuses having different melting temperatures of solder, in addition to the above-described embodiment, for example, as shown in FIG. The shapes of the engagement holes 13a and 14a of the portions 11 and 12 and the fasteners 13 and 14 may be made different from each other.
[0024]
【The invention's effect】
According to the damper fuse of the present invention, the two fuse fittings constituting the temperature fuse are formed in a substantially L shape, and the damper plate formed between the hook portions which are substantially L-shaped horizontal pieces can be sandwiched. While maintaining the basic function of the thermal fuse that keeps the damper plate open with a narrow gap, the bases, which are substantially L-shaped vertical pieces, are overlapped and fixed by heat sensitive materials inside and outside, so they are attached to the damper plate It is substantially only the size of one fuse fitting that protrudes into the air passage inside the fireproof damper in the heated state. Therefore, the ventilation performance during normal use can be improved as compared with the conventional thermal fuse. In addition, since it has an engagement hole that engages with the hook part of the thermal fuse and is equipped with a fastener that is fixed to the damper plate, the fuse fitting will remain in the hook part even if the heat sensitive material melts and the damper plate is closed. Does not scatter while remaining engaged with the engagement hole. Therefore, the scattered fuse fitting does not impair the complete blockage of the damper plate.
[0025]
In addition, the fastener is fixed to the opposite plate surface of one damper plate facing the plate surface in the open state, and is attached between the opposed damper plates that do not contribute to ventilation, so that the fastener inhibits pressure loss. Does not become an element. Further , the hook portion of the thermal fuse and the engagement hole of the fastener are formed in different shapes for each thermal fuse and fastener having different melting temperatures of the heat sensitive material, so that erroneous use of the thermal fuse can be reliably prevented. . And since the engagement piece which has spring elasticity was formed in the hook part of the fuse metal fitting engaged with the engagement hole of a fastener, if the force exceeding the spring elasticity of an engagement piece does not act, it will not remove from an engagement hole Therefore, it is difficult to remove the fuse fitting even when the damper plate is closed.
[0026]
According to the fireproof damper of the present invention, the fastener is attached to the opposite plate surface of one of the damper plates facing each other in the open state, and the hook portion of the outer fuse fitting is engaged with the engagement hole. Even when the heat sensitive material melts and the damper plate is closed, the outer fuse fitting remains engaged with the engagement hole of the fastener and does not scatter. Therefore, it is possible to prevent a problem that the scattered outer fuse fitting is sandwiched between the damper plate and the cylindrical main body and the air passage cannot be completely blocked. In addition, since the fastener is attached to the plate surface on the opposite side of the one damper plate facing in the open state, that is, the portion that originally does not contribute to ventilation, the pressure loss is reduced by attaching the fastener to one damper plate. Is not disturbed. Further, the hook portion of the thermal fuse and the engagement hole of the fastener are formed in different shapes for each thermal fuse and fastener having different melting temperatures of the heat sensitive material, so that erroneous use of the thermal fuse can be reliably prevented. .
[Brief description of the drawings]
FIG. 1 is an external perspective view of a thermal fuse according to an embodiment of the present invention.
2 is a cross-sectional view taken along the line SA-SA in FIG. 4 showing an engagement state between the thermal fuse and the damper plate in FIG. 1;
FIG. 3 is an external perspective view showing a mounting state between a damper plate and a fastener.
FIG. 4 is an external perspective view of a fireproof damper according to an embodiment of the present invention.
FIG. 5 is a plan view sectional view seen from the line SB-SB of FIG. 2 showing an engagement state between a thermal fuse and a fastener according to another embodiment.
[Explanation of symbols]
1,1 'Thermal fuse 2 Fuse bracket (inside)
2a Base 2b Hook 3 Fuse fitting (outside)
3a Base part 3b, 3b 'Hook part 3c Engagement piece 4 Solder (heat sensitive material)
5 Fireproof damper 6 Damper plate 7 Damper plate 8 Fastener 8a Engagement hole 9 Tubular body 11 Hook part 12 Hook part 13 Fastener 13a Engagement hole 14 Fastener 14a Engagement hole d Nipping gap

Claims (6)

In a damper fuse to be attached to a damper plate of a fireproof damper having two damper plates facing each other in the open state,
The L-shaped vertical piece is formed in a state where two fuse fittings are formed in a substantially L shape, and a holding gap is provided between the hook portions, which are the L-shaped horizontal pieces, so that the damper plate can be held. A thermal fuse in which the bases are superposed inside and outside with a heat sensitive material that melts at a predetermined temperature; and
A damper fuse comprising: an engagement hole that engages with a hook portion of a thermal fuse, and a fastener that is fixed to the damper plate. The damper fuse according to claim 1, wherein the fastener is fixed to a plate surface on the opposite side of one of the damper plates opposed to each other in the open state. The damper fuse according to claim 1 or 2, wherein the hook portion of the fuse fitting and the engagement hole of the fastener are formed in different shapes for each temperature fuse and fastener having different melting temperatures of the heat sensitive material. The damper fuse according to any one of claims 1 to 3, wherein an engagement piece having spring elasticity is formed on a hook portion of a fuse fitting to be engaged with an engagement hole of a fastener. A tubular body;
Two damper plates that are pivotally supported so that the plate surface faces along the cylinder axis direction of the cylindrical body in an open state inside the cylindrical body;
The L-shaped vertical piece is formed in a state where two fuse fittings are formed in a substantially L shape, and a holding gap is provided between the hook portions, which are the L-shaped horizontal pieces, so that the damper plate can be held. A thermal fuse in which the bases are superposed inside and outside with a heat sensitive material that melts at a predetermined temperature; and
A hook that has an engagement hole that engages with the hook portion of the thermal fuse, and that is attached to the plate surface on the opposite side of one of the damper plates facing in an open state;
Engage the hook part of the outer fuse fitting with the engagement hole of the fastener, and bring the hook part of the inner fuse fitting into contact with the plate surface on the opposite back side of the other damper plate to open both damper plates. A fire damper that maintains its state. The fireproof damper according to claim 5, wherein the hook portion of the fuse fitting and the engagement hole of the fastener are formed in different shapes for each temperature fuse and fastener having different melting temperatures of the heat sensitive material.

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