Concealed fire sprinkler

Abstract

This invention relates to a concealed fire sprinkler, comprising a sprinkler head housed within a concealed assembly. The sprinkler head includes a body with two vertical side arms, a hollow section between the side arms for housing a heat-sensing component, and each side arm has a vertical guide hole. Two guide rods pass through corresponding vertical guide holes, their lower ends connected to a return water plate. When the fire environment triggers the heat-sensing component, a water-stop seat detaches, releasing fire-fighting water. The return water plate, guided by the guide rods, protrudes downwards from the concealed assembly to disperse the fire-fighting water. This invention, through its structural design integrating the vertical guide holes and guide rods within the side arms, effectively reduces the radial dimension of the sprinkler head, achieving miniaturization and optimizing the assembly space utilization with the concealed assembly.

Description

Concealed fire sprinkler Technical Field

[0001] This invention relates to a fire sprinkler technology, particularly a lifting guide mechanism with radial dimension reduction effect, which integrates the guide structure into the sprinkler head, allowing the return plate to move downward from a concealed position and be exposed outside the ceiling, thereby achieving miniaturization of the overall components and an automated spraying configuration for a concealed fire sprinkler. Prior Technology

[0002] Existing exposed fire sprinklers are mainly used on building ceilings and consist of a sprinkler body, a glass temperature-sensing tube, a water-stop seat, and a return plate. The sprinkler body has a drain hole and two support arms around its perimeter to support the central glass temperature-sensing tube. The upper end of the glass temperature-sensing tube abuts against the water-stop seat, sealing the drain hole. When the ambient temperature reaches a predetermined value, the glass temperature-sensing tube ruptures, causing the water-stop seat to detach, and water sprays downwards from the drain hole. The water is then dispersed by the return plate to create a scattered spray effect, achieving fire extinguishing. However, this conventional sprinkler system is an exposed structure, with the sprinkler body and return plate directly exposed below the ceiling, affecting the interior aesthetics and making it difficult to meet the needs of modern interior design.

[0003] To meet the aesthetic design requirements of ceilings, another known technology modifies exposed sprinklers into concealed sprinklers, with a retractable water return plate designed to automatically descend. The sprinkler body is housed within a sleeve, with a protective cap welded to the lower end of the sleeve to conceal the retractable water return plate. During installation, the sleeve extends into the ceiling, allowing the protective cap to lie flat beneath it. When the temperature rises in a fire, the welds on the protective cap melt and detach, causing the retractable water return plate to automatically descend and expose the ceiling. Water then begins to spray downwards when the glass temperature sensor ruptures. However, conventional retractable water return plate descending structures have various designs, often resulting in a complex sprinkler structure and increased width or diameter, hindering sprinkler miniaturization and consequently leading to a larger sleeve. Therefore, improving upon the shortcomings of conventional concealed sprinklers is the challenge this invention aims to address. Summary of the Invention

[0004] The main purpose of this invention is to provide a concealed fire sprinkler, which, through the structural configuration of two vertical side arms, vertical guide holes, two guide rods and a return water plate of the sprinkler body, enables the return water plate to have an automatic lowering function, and the overall width or diameter of the sprinkler is reduced, making it suitable for installation in a concealed sleeve and protective cover.

[0005] The secondary objective of this invention is to provide a concealed fire sprinkler that, through structural improvements to concealed components, achieves the effects of quick assembly and adjustment of the sprinkler head and reduced costs.

[0006] To achieve the above objectives, this invention proposes a concealed fire sprinkler, the preferred technical solution of which includes a sprinkler head having a body, a temperature sensing component, a water-stop seat, two guide rods, and a return plate. The body has two vertical side arms located on either side, a hollow portion formed between the two vertical side arms, and a threaded connector extending upward from the upper end of the body. A drain hole is provided inside the threaded connector, vertically communicating with the hollow portion. Each vertical side arm has a vertical guide hole extending from the upper end to the lower end of the vertical side arm and forming a through-hole. The temperature sensing component is located in the hollow portion, its upper end supporting the water-stop seat, causing the water-stop seat to seal the drain hole. When the temperature sensing component is heated and activated, it releases the supporting force on the water-stop seat, causing the water-stop seat to detach from the drain hole. The two guide rods are respectively inserted into the corresponding vertical guide holes, and the lower end of each guide rod extends out of the vertical side arm and is connected to the return water plate; thereby, the return water plate can be guided by the two guide rods and gravity to automatically descend relative to the main body.

[0007] In one preferred embodiment, the aforementioned concealed fire sprinkler has a vertical guide hole comprising a large upper section, a small lower section, and a stop at the bottom of the large section; the upper end of the guide rod has a cap, the guide rod passes through the small section, and the cap is positioned within the large section, thereby allowing the guide rod to descend until the cap abuts against the stop.

[0008] In one preferred technology, the aforementioned concealed fire sprinkler has a plurality of locking protrusions on the outer wall of the vertical side arm for locking the main body in a concealed component.

[0009] In one preferred embodiment, the aforementioned concealed fire sprinkler has a screw seat connected between the lower ends of the two vertical side arms. An adjusting screw is screwed into the screw seat, and the upper end of the adjusting screw abuts against the lower end of the temperature sensing component.

[0010] In one of the preferred technologies, the temperature sensing component in the aforementioned concealed fire sprinkler is a glass temperature sensing tube.

[0011] In one preferred embodiment, the aforementioned concealed fire sprinkler further includes a concealed component, which has a sleeve and a protective cover, wherein: the sleeve is a circular sleeve made of metal; the protective cover is a metal cover, the upper part of which is spot-welded to the lower end of the sleeve, and the spot-welded solder is a low-melting-point solder; and the body of the sprinkler head is disposed inside the sleeve, such that the protective cover covers the return water plate below the sprinkler head.

[0012] In one preferred embodiment, the inner wall of the sleeve of the aforementioned concealed fire sprinkler is provided with a plurality of locking grooves, and the outer wall of the vertical side arm of the main body is provided with a plurality of locking protrusions, for locking the outer wall of the vertical side arm into the inner wall of the sleeve.

[0013] In one of the preferred technologies, in the aforementioned concealed fire sprinkler, the locking groove is a spiral groove and the locking protrusion is a spiral protrusion, which is used to enable the outer wall of the vertical side arm to be screwed into the inner wall of the sleeve.

[0014] This invention discloses a concealed fire sprinkler, the advantages of which are: by placing the vertical guide holes inside the two vertical side arms, the overall radial dimension of the main body can be reduced, allowing for easy installation in a narrow-diameter sleeve for a concealed and aesthetically pleasing design. Simultaneously, the structure of two guide rods passing through the vertical guide holes ensures that the return water plate automatically and smoothly descends vertically relative to the main body after the temperature sensing component is activated, preventing skew and ensuring the reliability of the spray range. Furthermore, the interlocking or screwing of the locking protrusions on the outer wall of the vertical side arms and the locking grooves on the inner wall of the sleeve not only simplifies the installation process but also allows for fine-tuning of the height according to construction needs. Simple Explanation of the Diagram

[0015] Figure 1 is a three-dimensional schematic diagram of the sprinkler head in this design. Figure 2 is a front view diagram of Figure 1. Figure 3 shows the cross-section and operation diagram of Figure 2. Figure 4 is a three-dimensional schematic diagram of the sprinkler head installed in the hidden component. Figure 5 is an exploded view of the sprinkler head and hidden components of this creation. Figure 6 is a cross-sectional view of the sprinkler head installed in the hidden component. Figure 7 is a schematic diagram of the action of the water return plate of this creation being exposed downwards from the hidden component. Implementation

[0016] The technical features, structure, and other functions, purposes, and effects of this invention are described in detail below with reference to the accompanying drawings and embodiments:

[0017] Referring to Figures 1, 2, and 3, this invention discloses a concealed fire sprinkler, the main body of which is a sprinkler head 100. The sprinkler head 100 has a body 10, a temperature sensing component 20, a water-stop seat 30, two guide rods 40, and a return water plate 50, wherein:

[0018] The main structure of the sprinkler head, made of precision-cast copper alloy, has two vertical side arms 11 extending downwards on both sides, a hollow portion 12 formed between the two vertical side arms 11, and a threaded connector 13 extending upwards from the upper end of the main body 10. A drain hole 14 is provided inside the threaded connector 13, vertically connected to the hollow portion 12, allowing fire-fighting water flowing into the drain hole 14 to fall into the hollow portion 12. Each vertical side arm 11 has a vertical guide hole 15 inside, extending from the upper end to the lower end of the vertical side arm 11 and forming a through-hole. More specifically, the vertical guide hole 15 has a large upper section 151, a small lower section 152, and a stop portion 153 at the bottom end of the large section 151, for providing a passage for the guide rod 40.

[0019] The temperature-sensing component 20 is installed in the hollow section 12, and its upper end supports a water-stop seat 30, which seals the drain hole 14. When the temperature-sensing component 20 is heated and activated, it releases the supporting force on the water-stop seat 30, causing the water-stop seat 30 to detach from the drain hole 14, thus allowing fire-fighting water to fall into the hollow section 12. More specifically, the temperature-sensing component 20 is a known glass temperature-sensing tube containing liquids such as alcohol. When the temperature reaches 57°C to 93°C, it ruptures, causing the water-stop seat 30 to lose its supporting force and detach from the drain hole 14.

[0020] The two guide rods 40 are respectively inserted into the corresponding vertical guide holes 15, and the lower end of each guide rod 40 extends out of the vertical side arm 11 and is connected to the return water plate 50. The return water plate 50 is a circular plate with a plurality of toothed plates 51 and toothed grooves 52 distributed around its perimeter. In this way, when the protective cover 70 blocking the return water plate 50 detaches (as shown in Figures 6 and 7), the return water plate 50 is guided by the two guide rods 40 and subjected to gravity, and automatically descends relative to the main body 10, so that the fire-fighting water falling into the return water plate 50 through the drain hole 14 can be scattered. The upper end of each guide rod 40 has a cap 41, and the guide rod 40 is inserted into the small hole section 152, with the cap 41 located within the large hole section 151, so that the guide rod 40 can descend until the cap 41 abuts against the stop part 153.

[0021] Referring again to Figures 1 and 3, in order to position and adjust the temperature sensing component 20 (glass temperature sensing tube), the structure of the main body 10 further includes a screw seat 16 connected between the lower ends of the two vertical side arms 11. An adjusting screw 17 is screwed into the screw seat 16, so that the upper end of the adjusting screw 17 abuts against the lower end of the temperature sensing component 20, thereby forming a structure that supports the water stop seat 30 at the upper end.

[0022] Referring to Figures 4, 5, and 6, the concealed fire sprinkler of this invention further includes a concealed component 200, which has a sleeve 60 and a protective cover 70. The sleeve 60 is a circular metal sleeve. The protective cover 70 is a metal cover, and its upper surface is spot-welded to the lower end of the sleeve 60. The spot-welded solder can be a low-melting-point solder with a temperature range of 57°C to 93°C. The body 10 of the sprinkler head 100 is disposed within the sleeve 60, so that the protective cover 70 covers the return water plate 50 below the sprinkler head 100. During installation, the sleeve 60 passes through the ceiling, and the protective cover 70 covers the ceiling, thereby concealing the sprinkler head 100 within the ceiling.

[0023] Referring again to Figures 5 and 6, the inner wall of the sleeve 60 is provided with a plurality of locking grooves 62, and the outer wall of the vertical side arm 11 of the body 10 of the sprinkler head 100 is provided with a plurality of locking protrusions 18, for locking the outer wall of the vertical side arm 11 into the inner wall of the sleeve 60. In a preferred embodiment, the locking groove 62 is a spiral groove, and the locking protrusion 18 is a spiral protrusion, for allowing the outer wall of the vertical side arm 11 to be screwed into the inner wall of the sleeve 60, facilitating adjustment of the height of the sprinkler head 100 assembled in the sleeve 60.

[0024] Referring to Figure 7, when the concealed fire sprinkler of this invention is in use, if the temperature at the fire scene reaches a certain level, the weld or adhesive point between the sleeve 60 and the protective cover 70 melts, causing the protective cover 70 to fall from the ceiling. The return water plate 50, hidden within, is guided by the two guide rods 40 and automatically descends relative to the main body 10, exposing the return water plate 50 to the ceiling, thus enabling the fire-fighting water to be sprayed in all directions for fire suppression.

[0025] In conclusion, this invention, a concealed fire sprinkler, is indeed practical and innovative. Its technical methods are undeniably novel, and its effectiveness and design purpose are perfectly aligned, demonstrating reasonable progress. Therefore, we hereby file a utility model patent application, and earnestly request your esteemed office to conduct a thorough examination and grant a patent. We would be most grateful for your assistance.

[0026] 100: Sprinkler head 200: Hidden Components 10:Ontology 11: Vertical side arm 12: Openwork section 13: Screw connector 14: Drain hole 15: Vertical guide hole 151: Large Hole Section 152: Small hole segment 153: Stopping part 16: Screw base 17: Adjusting screw 18: Locking bar 20: Temperature sensing component 30: Water stop 40: Guide rod 41: Hat section 50: Return water plate 51: Gear 52: Gear Alveolar 60: Sleeve 62: Locking groove 70: Protective cover

Claims

1. A concealed fire sprinkler, comprising a sprinkler head having a body, a temperature sensing component, a water-stop seat, two guide rods, and a return water plate, wherein: The main body has two vertical side arms located on both sides, a hollow section formed between the two vertical side arms, and a threaded connector extending upward from the upper end of the main body. A drain hole is provided inside the threaded connector, which vertically connects to the hollow section. Each vertical side arm has a vertical guide hole extending from the upper end to the lower end of the vertical side arm and forming a through-hole. A temperature sensing component is disposed in the hollow section, and its upper end supports the water-stop seat, causing the water-stop seat to seal the drain hole. When the temperature sensing component is heated and activated, it releases the supporting force on the water-stop seat, causing the water-stop seat to detach from the drain hole. Two guide rods are respectively inserted through the corresponding vertical guide holes, and the lower end of each guide rod extends out of the vertical side arm and connects to the return water plate. Thus, the return water plate can automatically descend relative to the main body under the guidance of the two guide rods and gravity.

2. The concealed fire sprinkler as claimed in claim 1, wherein the vertical guide hole has a large upper section, a small lower section, and a stop at the bottom of the large section; the upper end of the guide rod has a cap, the guide rod passes through the small section and the cap is located within the large section, thereby allowing the guide rod to descend until the cap abuts against the stop.

3. The concealed fire sprinkler as described in claim 2, wherein the outer wall of the vertical side arm is provided with a plurality of locking protrusions for locking the body in a concealed assembly.

4. The concealed fire sprinkler as claimed in claim 1, wherein the body has a screw seat connected between the lower ends of the two vertical side arms, the screw seat being screwed into an adjusting screw, the upper end of the adjusting screw abutting against the lower end of the temperature sensing component.

5. The concealed fire sprinkler as described in claim 4, wherein the temperature sensing component is a glass temperature sensing tube.

6. The concealed fire sprinkler as described in claim 1 further includes a concealment component having a sleeve and a protective cover, wherein: The sleeve is a circular sleeve made of metal; the protective cover is a metal cover, the top of which is spot-welded to the lower end of the sleeve, and the spot-welded solder is a low-melting-point solder; and the body of the sprinkler head is disposed inside the sleeve, so that the protective cover covers the return water plate below the sprinkler head.

7. The concealed fire sprinkler as described in claim 6, wherein the inner wall of the sleeve is provided with a plurality of locking grooves, and the outer wall of the vertical side arm of the body is provided with a plurality of locking protrusions for locking the outer wall of the vertical side arm into the inner wall of the sleeve.

8. The concealed fire sprinkler as claimed in claim 7, wherein the locking groove is a spiral groove and the locking protrusion is a spiral protrusion, for enabling the outer wall of the vertical side arm to be screwed into the inner wall of the sleeve.

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