JP3129854U - Sprinkler head seal structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a fluororesin seal member interposed between a nozzle outlet end of a sprinkler head and a valve body at a low cost, and to prevent a misalignment between a water passage and a seal member of the sprinkler head. Providing a seal structure.
SOLUTION: A structure in which a valve body 3 closes a nozzle 7 in a state where a fluororesin sheet F having a nozzle outlet end shape and coated with an adhesive on one surface is attached to the nozzle outlet end; After attaching a fluororesin sheet coated with adhesive on one side to the valve seat 8 formed at the nozzle outlet end of the sprinkler head body 1, the sheet is cut into the nozzle outlet end shape and then the valve seat 8 and the valve The body 3 was brought into close contact.
[Selection] Figure 1

Description

The present invention relates to a seal structure of a sprinkler head for fire fighting.

As a conventional sprinkler head seal structure, there is one using a fluororesin seal member (see, for example, Patent Document 1).

The sprinkler head has a nozzle outlet end of the main body and a valve body in close contact with each other via a fluororesin seal member, and has a fluororesin layer formed on the valve body side. Is a cap that covers the upper surface of the valve body or a ring that contacts the sealing surface of the water outlet formed in the main body.

By using a fluororesin seal member, the seal member has corrosion resistance and weather resistance, and because it is deformed according to the shape of the water discharge port end surface due to the elasticity of the fluororesin, processing accuracy of the main body seal surface is required. It has the advantage that the processing and handling are simple, and since the sealing surface is flat, the sealing area is wide and the sealing performance is not impaired even if corrosion occurs in part of the end of the outlet. .

Japanese Utility Model Publication No. 5-23227

However, when the surface of the valve body of the sprinkler head is coated with a fluororesin, it must be formed through a drying process at a predetermined temperature and time after applying or spraying the fluororesin liquid, which takes time and effort. Work, and also the coating thickness must be controlled.

Further, when a fluororesin seal member formed in a cap shape or a ring shape is used, there is a possibility of causing leakage if the seal member is used in a state where the core is displaced when it is put on the upper surface of the valve body.

In view of the above problems, an object of the present invention is to provide a sprinkler head sealing structure that can be manufactured at low cost and does not cause misalignment between the water passage and the sealing member of the sprinkler head.

In order to achieve the above object, the invention according to claim 1 is a sprinkler head in which a fluororesin sheet is interposed between a nozzle outlet end of the sprinkler head and a valve body that always closes the nozzle. This is a sprinkler head seal structure in which a valve body closes a nozzle in a state where a fluororesin sheet having a nozzle outlet end shape and having an adhesive applied on one surface is stuck to the nozzle outlet end.

In the sprinkler head in which a fluororesin sheet is interposed between the nozzle outlet end of the sprinkler head and the valve element that always closes the nozzle, an adhesive is applied to one surface. The sprinkler head seal structure according to claim 1, wherein the fluororesin sheet is attached to the nozzle outlet end of the sprinkler head main body, and then cut into a nozzle outlet end shape, and then the nozzle outlet end and the valve body are brought into close contact with each other. .

The invention described in claim 3 is the sprinkler head, wherein the nozzle outlet end has a chamfered corner on the inside and outside of the nozzle, and an intermediate flat portion is in close contact with the valve body. It is a seal structure of the described sprinkler head.

The invention described in claim 4 is the sprinkler head, wherein the nozzle outlet end has a convex shape projecting toward the valve body, and the tip flat surface of the convex part is in close contact with the valve body. Sprinkler head seal structure.

The invention according to claim 5 is the sprinkler head seal according to claim 1, wherein the nozzle outlet end has a cross-sectional shape in which a groove is formed in the end face and the end face is in close contact with the valve body. Construction.

The invention according to claim 6 is the sprinkler head sealing structure according to claim 1, wherein the inner diameter of the cut fluororesin sheet in the sprinkler head is larger than the inner diameter of the nozzle outlet end.

In the sprinkler head according to the seventh aspect of the present invention, in the sprinkler head, the load for bringing the valve body into close contact with the nozzle outlet end includes a set screw disposed on the same axis as the valve body and a screw portion provided on the support member. The sprinkler head seal structure according to claim 1, wherein the seal structure is applied from the valve body toward the nozzle side by tightening.

The invention according to claim 8 is the sprinkler head, wherein the load for bringing the valve body into close contact with the nozzle outlet end connects the main body and the frame to which the thermal decomposition portion holding the valve body is locked. The sprinkler head seal structure according to claim 1, wherein the seal structure is applied by tightening a screw.

The invention according to claim 9 is the sprinkler head seal structure according to claim 1, wherein the thickness of the fluororesin sheet is 0.1 mm or less in the sprinkler head.

By sticking a fluororesin sheet with a nozzle outlet end shape to the nozzle outlet end of the main body, it is possible to prevent misalignment of the fluororesin sheet without shifting the position when the nozzle is closed by the valve body It is. Alternatively, the sealing member can be installed at the nozzle outlet end without being misaligned by attaching a fluororesin sheet to the nozzle outlet end of the main body and cutting the sheet. Since one surface of the fluororesin sheet is coated with an adhesive and is adhered to the nozzle outlet end, the sealing member is prevented from peeling off after cutting.

The cross-sectional shape of the nozzle outlet end is chamfered at the inner and outer corners of the nozzle, and the flat part in the middle is used as a sealing surface by being in close contact with the valve body. Specifications of various sprinkler heads Even when the nozzle diameter is different, the diameter of the sealing surface can be made the same by adjusting the size of the chamfered portion, and the cutter can be shared.

In addition, the fluororesin sheet is cut so that the inner diameter of the cut fluororesin sheet is larger than the inner diameter of the nozzle so as not to protrude inside the nozzle, so that the fluororesin sheet does not affect the water discharge amount of the sprinkler head. .

As the fluororesin sheet, one having an adhesive applied on one side is used. The fluororesin sheet may be installed by pasting the nozzle outlet end shape (for example, ring shape) on the nozzle outlet end in advance, for example, a rectangular fluororesin that can cover the nozzle outlet end After sticking the adhesive surface of the sheet to the nozzle outlet end of the main body, it may be cut into a ring shape in accordance with the nozzle outlet end shape.

When the fluororesin sheet is applied, the valve seat surface that contacts the valve body is preferably horizontal in order to prevent the fluororesin sheet from wrinkling. In addition, cutting is performed so that the fluororesin sheet does not protrude inside the nozzle.

The load that presses the valve body against the nozzle outlet end to which the fluororesin sheet is attached is a screw part provided on the set screw and the support member arranged on the same axis as the valve body, like a frame yoke type sprinkler head It is good also as a structure where a load is applied to a valve body by tightening, a frame with which a thermal decomposition part holding a valve body is locked like a flash type or a multi type sprinkler head, It is also possible to adopt a structure that is applied by tightening a screw that connects the two.

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view of a sprinkler head using the seat structure of the present invention, and FIG. 2 is an enlarged sectional view of a valve seat portion of the sprinkler head of FIG.

The sprinkler head of the embodiment shown in FIGS. 1 and 2 includes a main body 1, a frame 2, a valve body 3, a deflector 4, a thermal decomposition portion 5, and the like.

The main body 1 has a nozzle 7 formed in the center, and an outlet end on the lower end side is a valve seat 8. According to the cross-sectional shape of the valve seat 8 shown in FIG. 2, the surface in contact with the valve body 3 is a horizontal portion 8A, and both ends of the horizontal portion 8A are chamfered. The end 8B opposite to the nozzle 7 of the horizontal portion 8A has a gentle chamfering angle compared to the end 8C on the nozzle 7 side.

The fluororesin sheet F to be affixed to the valve seat 8 is cut into a ring shape after being affixed. After being cut into a ring shape, the fluororesin sheet F is adhered so as to cover the horizontal portion 8A and the end 8B portion, and the nozzle 7 The surface of the end 8C is not covered. This is because if the fluororesin sheet F protrudes inside the nozzle 7, the fire-extinguishing water passing through the nozzle 7 is affected, and the prescribed water discharge amount may not be obtained.

A male screw 9 for connecting to a water supply pipe filled with fire extinguishing water is screwed on the outer periphery of the main body 1, and a flange 10 is formed on the lower end.

The frame 2 has a cylindrical shape, and the upper end is screwed into the flange 10 of the main body 1. A step portion 12 is formed on the inner peripheral side at the lower end.

The valve body 3 is pressed to the nozzle 7 side by the thermal decomposition portion 5 during normal times, and is in close contact with the valve seat 8 of the main body 1 through the fluororesin sheet F to close the nozzle 7.

The deflector 4 is fixedly installed below the valve body 3. The deflector 4 is dish-shaped and has a large number of blades around it. A ring 14 is placed on the blades and is connected to the ring 14 via a plurality of pins 15.

The deflector 4 is slidable along the pin 15, and the deflector 4 is accommodated in the frame 2 and is in a position close to the ring 14 in normal times. When the sprinkler head is operated, the deflector 4 falls along the pin 15 and is suspended by a ring 14 that is locked to the step portion 12 of the frame 2.

The thermal decomposition portion 5 is locked to the step portion 12 of the frame 2 and holds the valve body 3 via the guide post 16. Since the detailed structure of the thermal decomposition portion 5 is already known and described in Japanese Patent Laid-Open No. 7-284545, description thereof is omitted.

A plurality of thin plate-shaped heat collectors 18 are provided at the lower end of the thermal decomposition portion 5. The heat collector 18 has a function of absorbing the heat of the fire and transmitting it to the thermal decomposition portion 5 to promote the operation of the thermal decomposition portion 5.

Next, the procedure for attaching the fluororesin sheet to the valve seat will be described.

The fluororesin sheet that is affixed to the valve seat 8 of the main body 1 is coated with an adhesive only on one surface, and the adhesive surface is affixed to the valve seat 8 before assembling the sprinkler head to match the shape of the valve seat 8. And cut into rings. First, the adhesive surface to which the adhesive of the fluororesin sheet is applied is attached to the valve seat 8. Subsequently, the cutter is pressed against the valve seat 8, the fluororesin sheet is cut into a ring shape, and the excess sheet is removed. Thus, a ring-shaped fluororesin sheet is attached to the valve seat 8.

In addition to the embodiment described above, the cross-sectional shape of the valve seat 8 of the main body 1 is a convex shape protruding toward the valve body 3 as shown in FIG. The groove may be formed in the valve seat 8 as shown in FIG. The number of grooves is not limited to one, and a plurality of grooves can be provided.

Further, as shown in FIG. 4C, a portion protruding toward the valve body 3 is formed on the inner surface side of the nozzle 7, and as shown in FIG. 5D, the outer surface side of the nozzle 7 faces the valve body 3 side. A protruding portion may be formed. The cross-sectional shape from the contact surface with the valve body 3 to the inner surface and the outer surface of the nozzle 7 may be formed in a step shape, or may be formed in a slope or a curved surface.

The above-mentioned sprinkler head seal structure can also be used for applications other than the sprinkler head. In the embodiments, the compression-type thermal decomposition partial structure that is widely used has been described. However, a structure other than this, for example, a link in which two metal plates are joined with a low melting point alloy is used as the thermal decomposition partial structure. Using a glass bulb in which alcohol or the like is enclosed in a glass container, a structure using a ball described in JP-A-8-187301, a ring described in Japanese Utility Model Laid-Open No. 2-109661 It is also possible to apply to a sprinkler head or the like having a structure using Further, it can be used for a frame yoke type sprinkler head or a multi-type sprinkler head having a different form from the above embodiment.

Cross section of a sprinkler head using the seat structure of the present invention 1 is an enlarged sectional view of the valve seat portion of the sprinkler head of FIG. Another embodiment of the sectional shape of the valve seat

Explanation of symbols

1 Body
2 frames
3 Disc
4 Deflector
5 Thermal decomposition part
7 Nozzles
8 Valve seat
10 Flange
12 steps
F Fluororesin sheet

Claims (9)

In the sprinkler head in which a fluororesin sheet is interposed between the nozzle outlet end of the sprinkler head and the valve element that always closes the nozzle, the nozzle outlet end shape is formed, and adhesive is applied to one surface. A sprinkler head sealing structure, characterized in that a valve body closes the nozzle in a state where a fluororesin sheet is stuck to the nozzle outlet end. In a sprinkler head in which a fluororesin sheet is interposed between the nozzle outlet end of the sprinkler head and the valve element that always closes the nozzle, the sprinkler head body is coated with a fluororesin sheet coated on one side. 2. The sprinkler head sealing structure according to claim 1, wherein the nozzle outlet end and the valve body are brought into close contact with each other after being attached to the nozzle outlet end and then cut into a nozzle outlet end shape. 3. The sprinkler head according to claim 1, wherein the nozzle outlet end has a chamfered corner on the inside and outside of the nozzle, and an intermediate flat portion is in close contact with the valve body. Head seal structure. The sprinkler head according to claim 1, wherein a cross-sectional shape of a nozzle outlet end of the sprinkler head is a convex shape protruding toward the valve body, and a tip flat surface of the convex portion is in close contact with the valve body. Seal structure. 3. The sprinkler head sealing structure according to claim 1, wherein a cross-sectional shape of the nozzle outlet end of the sprinkler head has a groove formed on an end surface thereof, and the end surface is in close contact with the valve body. 3. The sprinkler head sealing structure according to claim 1, wherein an inner diameter of the cut fluororesin sheet in the sprinkler head is larger than an inner diameter of a nozzle outlet end. In the sprinkler head, the load for bringing the valve body into close contact with the nozzle outlet end is determined by tightening a set screw arranged on the same axis as the valve body and a screw portion provided on the support member from the valve body to the nozzle side. The sprinkler head seal structure according to claim 1, wherein the seal structure is applied toward the surface. In the sprinkler head, the load for bringing the valve body into close contact with the nozzle outlet end is applied by tightening a screw that connects the main body to the frame on which the thermal decomposition portion holding the valve body is locked. The sprinkler head seal structure according to claim 1, wherein the sprinkler head seal structure is provided. The sprinkler head sealing structure according to claim 1 or 2, wherein the thickness of the fluororesin sheet is 0.1 mm or less in the sprinkler head.

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