Concealed fire sprinkler

Abstract

We provide concealed fire sprinklers. [Solution] The concealed fire sprinkler is equipped with a sprinkler head 100, which is housed in a concealed unit 200. The sprinkler head 100 has a main body 10 with two vertical arms 11, and an opening 12 is formed between the two vertical arms 11 for the installation of a heat-sensitive unit 20. Vertical guide holes 15 are installed inside each vertical arm 11, and two guide rods 40 are inserted into their respective vertical guide holes 15, with their lower ends connected to a deflector 50. When the heat-sensitive unit 20 is activated by the environment of the fire site, the water-stopping seat 30 falls off and fire-fighting water is released. The deflector 50 is guided by the guide rods 40 and exposed downward from the concealed unit 200, dispersing the fire-fighting water. The structural design integrates the vertical guide holes 15 and guide rods 40 within the vertical arms 11, effectively reducing the radial dimensions of the sprinkler head 100, achieving miniaturization, and improving the utilization efficiency of the assembly space of the concealed unit 200.

Description

Technical Field

[0001] The present invention relates to fire sprinkler technology, and in particular, to a concealed fire sprinkler having a lifting guide mechanism with a reduced radial dimension effect, integrating a guide structure into a sprinkler head portion, so that a deflector can be moved downward from a concealed position and exposed outside the ceiling.

Background Art

[0002] Conventional exposed fire sprinklers are mainly applied to the ceilings of buildings. For example, as shown in Patent Document 1 and Patent Document 2, they are composed of a sprinkler body, a glass heat-sensitive tube, a water stop seat, and a deflector. A water discharge hole is formed in the sprinkler body, and two support arms are provided on its periphery to support the glass heat-sensitive tube arranged in the middle. The upper end of the glass heat-sensitive tube abuts against the water stop seat, and the water discharge hole is closed by the water stop seat. When the environmental temperature reaches a predetermined value, the glass heat-sensitive tube ruptures, whereby the water stop seat detaches, water flows out downward from the water discharge hole, and is further dispersed by the deflector to sprinkle water over a wide area, thereby achieving a fire extinguishing effect at the fire scene. However, since the above-mentioned conventional sprinkler has an exposed structure, the sprinkler body and the deflector are directly exposed below the ceiling, which not only damages the aesthetics of the room but also has the problem of being difficult to meet the requirements of modern interior design.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the aforementioned prior art, the deflector is designed to automatically descend, the sprinkler body is installed inside a sleeve, and a protective cover is welded to the lower end of the sleeve, covering the deflector at the lower end of the sprinkler body. During installation, the sleeve is inserted into the ceiling, and the protective cover is positioned to cover the underside of the ceiling flat. When the temperature rises during a fire, the welded part of the protective cover melts and falls off, the deflector automatically descends and is exposed below the ceiling, and water spraying downwards begins. However, there are various design forms of conventional deflector descent structures, and generally the sprinkler structure becomes more complex and the width or diameter increases, which is disadvantageous for miniaturizing the sprinkler, and consequently the sleeve also becomes larger. [Means for solving the problem]

[0005] The main objective of this invention is to provide a concealed fire-fighting sprinkler that, through the structural arrangement of the sprinkler body's vertical arms, vertical guide holes, both guide rods, and deflector, provides an automatic lowering function to the deflector, reduces the overall width or diameter of the sprinkler, and realizes a structure suitable for installation inside a concealed sleeve and protective cover.

[0006] A secondary objective of this invention is to provide a concealed fire sprinkler that enables rapid assembly and adjustment of the sprinkler head by improving the structure of the concealed unit.

[0007] A preferred technical configuration of the concealed fire sprinkler according to the present invention is a sprinkler head comprising a body, a heat-sensing unit, a water-stopping base, two guide rods, and a deflector, wherein the body comprises two vertical arms positioned on each side, an opening formed between the two vertical arms, and a threaded connecting pipe extending upward from the upper end of the body, with a water discharge hole provided inside the threaded connecting pipe and communicating vertically with the opening, and vertical guide holes provided inside each of the vertical arms. The vertical guide hole is formed to extend from the upper end to the lower end of the vertical arm, the heat-sensing unit is installed in the opening, its upper end supporting the water-stopping seat, the water-stopping seat closing the water-discharge hole, when the heat-sensing unit is heated and activated, the supporting force on the water-stopping seat is released, the water-stopping seat detaches from the water-discharge hole, the two guide rods are inserted into their respective vertical guide holes, the lower ends of each guide rod protrude from the vertical arm and are connected to the deflector, thereby the deflector automatically descends relative to the main body by the guidance of the two guide rods and the action of gravity.

[0008] To achieve the aforementioned secondary objectives, the present invention further comprises a concealment unit, the concealment unit comprising a sleeve and a protective cover, the sleeve being a cylindrical metal sleeve, the protective cover being a metal cap, the upper surface of the protective cover being spot-welded to the lower end of the sleeve using a low-melting-point welding material, the body of the sprinkler head being installed inside the sleeve, and the protective cover covering the deflector below the sprinkler head. [Effects of the Invention]

[0009] According to this invention, by providing each vertical guide hole inside the vertical arms, the radial dimension of the entire body can be reduced, and it can be easily installed inside a small-diameter sleeve, thereby improving concealment and aesthetics. At the same time, by inserting the two guide rods into the vertical guide holes, it is possible to ensure that the deflector automatically and smoothly descends vertically relative to the main body after the heat-sensing unit is activated, preventing tilting during operation and ensuring the reliability of the watering range. Furthermore, by locking or screwing the locking projection on the outer wall of the vertical arm and the locking groove on the inner wall of the sleeve together, the installation procedure can be simplified, and the height can be adjusted according to the construction conditions. [Brief explanation of the drawing]

[0010] [Figure 1] This is a three-dimensional schematic diagram of a sprinkler head according to the present invention. [Figure 2] Figure 1 is a schematic diagram of the front view. [Figure 3] Figure 2 shows a cross-sectional view and a schematic diagram of the operation. [Figure 4] This is a three-dimensional schematic diagram showing how the sprinkler head according to the present invention is attached to a concealed unit. [Figure 5] This is a schematic diagram of the disassembled sprinkler head and concealed unit according to the present invention. [Figure 6] This is a schematic cross-sectional view showing how the sprinkler head according to the present invention is attached to a concealed unit. [Figure 7] This is a schematic diagram illustrating the operation of the deflector according to the present invention, showing how it is exposed downwards from within the concealed unit. [Modes for carrying out the invention]

[0011] As shown in Figures 1, 2, and 3, the concealed fire sprinkler body according to the present invention is composed of a sprinkler head 100, which has a body 10, a heat-sensing unit 20, a water-stopping seat 30, two guide rods 40, and a deflector 50.

[0012] The main body 10 is the primary structure of the sprinkler head, formed by precision casting of a copper alloy, and comprises two vertical arms 11 positioned on both sides and extending downward, an opening 12 formed between the two vertical arms 11, and a threaded connecting pipe 13 extending upward from the upper end of the main body 10. A water discharge hole 14 is installed inside the threaded connecting pipe 13, and the water discharge hole 14 communicates vertically with the opening 12, guiding the fire-fighting water flowing into the water discharge hole 14 to the opening 12. A vertical guide hole 15 is installed inside each vertical arm 11, and the vertical guide hole 15 extends and penetrates from the upper end to the lower end of the vertical arm 11. More specifically, the vertical guide hole 15 has an upper large-diameter hole portion 151, a lower small-diameter hole portion 152, and a locking portion 153 formed at the bottom end of the large-diameter hole portion 151, and is configured for inserting a guide rod 40.

[0013] The heat-sensitive unit 20 is installed inside the opening 12, and its upper end supports the water-stopping seat 30, which in turn closes the water discharge hole 14. When the heat-sensitive unit 20 is heated and activated, the supporting force on the water-stopping seat 30 is released, and the water-stopping seat 30 detaches from the water discharge hole 14. This allows fire-fighting water to flow down into the opening 12. More specifically, the heat-sensitive unit 20 is a known glass heat-sensitive tube with a liquid such as alcohol sealed inside. When the temperature of the heat-sensitive unit 20 reaches 57°C to 93°C, it bursts, losing its supporting force on the water-stopping seat 30, which then detaches from the water discharge hole 14.

[0014] Two guide rods 40 are inserted into corresponding vertical guide holes 15, and the lower ends of each guide rod 40 protrude from the vertical arm 11 and are connected to the deflector 50. The deflector 50 is a circular plate with multiple teeth 51 and tooth grooves 52 formed around its circumference. As a result, when the protective cover 70 covering the deflector 50 falls off (see Figures 6 and 7), the deflector 50 automatically descends relative to the main body 10 by the guidance of the two guide rods 40 and gravity, and sprays the fire-fighting water flowing down from the water discharge hole 14 into the surrounding area. Each guide rod 40 has a head 41 at its upper end, and the guide rod 40 is inserted into a small-diameter hole 152, with the head 41 located in a large-diameter hole 151. As a result, the guide rod 40 can descend to a position where the head 41 abuts against the locking portion 153.

[0015] As shown in Figures 1 and 3, the main body 10 is further equipped with a screw seat 16 connected between the lower ends of both vertical arms 11 in order to position and adjust the heat-sensing unit 20 (glass heat-sensing tube). An adjustment screw 17 is screwed into the screw seat 16, and the upper end of the adjustment screw 17 abuts against the lower end of the heat-sensing unit 20, thereby forming a structure in which the upper end of the heat-sensing unit 20 supports the water-stopping seat 30.

[0016] As shown in Figures 4, 5, and 6, the concealed fire sprinkler according to the present invention further includes a concealment unit 200, the concealment unit having a sleeve 60 and a protective cover 70. The sleeve 60 is a cylindrical sleeve made of metal, and the protective cover 70 is a metal cap. The upper surface of the protective cover 70 is spot-welded to the lower end of the sleeve 60, and a low-melting-point welding material that melts at 57°C to 93°C is used for spot welding. The body 10 of the sprinkler head 100 is installed inside the sleeve 60, and the protective cover 70 covers the deflector 50 below the sprinkler head 100. When installing, the sleeve 60 is inserted into the ceiling, and the ceiling is covered with the protective cover 70, thereby concealing the sprinkler head 100 inside the ceiling.

[0017] As shown in FIGS. 5 and 6, a plurality of locking concave grooves 62 are provided on the inner wall of the sleeve 60, and a plurality of locking ridges 18 are provided on the outer wall of the vertical side arm 11 of the main body 10 of the sprinkler head 100. Thus, the outer wall of the vertical side arm 11 can be locked to the inner wall of the sleeve 60. In a preferred embodiment, the locking concave groove 62 is a spiral groove, and the locking ridge 18 is a spiral ridge, thereby enabling the outer wall of the vertical side arm 11 to be screwed to the inner wall of the sleeve 60 and facilitating the height adjustment of the sprinkler head 100 assembled in the sleeve 60.

[0018] As shown in FIG. 7, when the concealed fire sprinkler according to the present invention is in use, when the temperature at the fire site reaches a predetermined temperature, the welding part or the bonding part between the sleeve 60 and the protective cover 70 melts, and the protective cover 70 falls off from the ceiling. Thereby, the deflector 50 hidden inside automatically descends with respect to the main body 10 under the guidance of the two guide rods 40, and the deflector 50 is exposed to the ceiling. Thus, fire extinguishing water can be sprayed around to extinguish the fire.

[0019] The above-described embodiments of the present invention do not limit the present invention. Therefore, the scope protected by the present invention is based on the scope of claims for utility model registration described below.

Explanation of Reference Numerals

[0020] 100: Sprinkler head 200: Concealed unit 10: Main body 11: Vertical side arm 12: Opening 13: Threaded connecting pipe 14: Drain hole 15: Vertical guide hole 151: Large-diameter hole portion 152: Small-diameter hole portion 153: Locking portion 16: Threaded seat 17: Adjusting screw 18: Locking ridge 20: Heat-sensitive unit 30: Water-stop seat 40: Guide rod 41:Head 50: Deflector 51: Tooth piece 52: Tooth groove 60: Sleeves 62: Locking groove 70: Protective cover

Claims

1. A concealed fire sprinkler system comprising a sprinkler head, the sprinkler head having a body, a heat-sensing unit, a water-stopping base, two guide rods, and a deflector, The main body has two vertical arms positioned on each side, an opening formed between the two vertical arms, and a threaded connecting pipe extending upward from the upper end of the main body. A water discharge hole is provided inside the threaded connecting pipe, and the water discharge hole communicates vertically with the opening. A vertical guide hole is provided inside each of the vertical arms, and the vertical guide hole extends through the vertical arm from its upper end to its lower end. The heat-sensing unit is installed in the opening, and its upper end supports the water-stopping seat, which closes the water discharge hole, and when the heat-sensing unit is heated and activated, the supporting force on the water-stopping seat is released, and the water-stopping seat detaches from the water discharge hole. The two guide rods are each inserted into corresponding vertical guide holes, and the lower ends of each guide rod protrude from the vertical arm and are connected to the deflector, thereby causing the deflector to automatically descend relative to the main body by the guidance of the two guide rods and the action of gravity.

2. The concealed fire sprinkler according to claim 1, wherein the vertical guide hole has an upper large-diameter hole portion, a lower small-diameter hole portion, and a locking portion formed at the bottom end of the large-diameter hole portion, the upper end of the guide rod has a head, the guide rod is inserted through the small-diameter hole portion, and the head is located inside the large-diameter hole portion, thereby allowing the guide rod to descend until the head abuts the locking portion.

3. The concealed fire sprinkler according to claim 2, characterized in that a plurality of locking protrusions are provided on the outer wall of the vertical arm, thereby locking the main body into the concealed unit.

4. The concealed fire sprinkler according to claim 1, characterized in that the main body has a screw seat connected between the lower ends of the two vertical arms, the screw seat is screwed onto an adjustment screw, and the upper end of the adjustment screw abuts against the lower end of the heat sensing unit.

5. The concealed fire sprinkler according to claim 4, characterized in that the heat-sensing unit is a glass heat-sensing tube.

6. The concealed fire sprinkler according to claim 1 further comprises a concealed unit, the concealed unit comprising a sleeve and a protective cover, the sleeve being a cylindrical metal sleeve, the protective cover being a metal cap, the upper surface of the protective cover being spot-welded to the lower end of the sleeve, a low-melting-point welding material being used for the spot welding, the body of the sprinkler head being installed inside the sleeve, and the protective cover covering the deflector below the sprinkler head.

7. The concealed fire sprinkler according to claim 6, characterized in that a plurality of locking grooves are provided on the inner wall of the sleeve, and a plurality of locking protrusions are provided on the outer wall of the vertical arm of the main body, thereby enabling the outer wall of the vertical arm to be locked to the inner wall of the sleeve.

8. The concealed fire sprinkler according to claim 7, characterized in that the locking groove is a helical groove and the locking projection is a helical projection, thereby enabling the outer wall of the vertical arm to be screwed into the inner wall of the sleeve.

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