A ejection sprinkler and fire protection system

Abstract

The present invention provides a ejection nozzle and fire prevention system, which relates to the field of fire fighting equipment, including a nozzle sleeve, a cover, a piston and a temperature sensing component; the upper end of the nozzle sleeve is used to connect a water pipe, and the lower end is connected to the cover, the piston is arranged in the nozzle sleeve and can slide in the nozzle sleeve, the piston is provided with a water hole connected to the upper end of the nozzle sleeve, the temperature sensing component is connected to the lower end of the piston and supported on the cover, and the temperature sensing component blocks the water hole; after the cover is separated from the nozzle sleeve under fire, the piston can drive the temperature sensing component to slide downward and extend out of the nozzle sleeve, and the temperature sensing component can release the blocking of the water hole under fire, so that water leaks out from the water hole. The present invention can increase the water distribution space of the nozzle, adapt to fire places of different danger levels, and the structure used for water distribution will not jump during the water spraying process, thereby improving the water distribution performance, and can also improve the fire response speed and shorten the fire response time.

Description

Technical Field

[0001] The invention relates to the field of fire-fighting equipment, and in particular to a ejection nozzle and a fire-fighting system. Background Art

[0002] At present, traditional ejection sprinkler heads are installed in the suspended ceiling. When in the quasi-working state, the bottom cover is flush with the ceiling height. After a fire occurs, the soluble alloy welding points welded to the bottom cover melt, the bottom cover falls off, and the connecting rod and the splashback plate move down to 10 mm below the suspended ceiling. When the smoke temperature on the roof continues to rise, the temperature-sensitive glass parts in the inner cover burst, and the ball seat falls under the pressure of weight and water. The water in the pipe is sprayed out through the nozzle outlet, and then distributed through the splashback plate to spray onto the surface of the burning object.

[0003] The inventors have found that traditional ejection sprinkler heads have the following problems: 1. The connecting rod and the water distribution plate are moved down to 10 mm below the ceiling, which is close to the ceiling and the inner cover, and the water distribution is affected by the space; 2. In order to ensure that the connecting rod slides down smoothly, the gap between the connecting rod and the frame of the traditional ejection sprinkler head is large, and the water distribution plate will jump during the water spraying process, affecting the water distribution performance; 3. Traditional ejection sprinkler heads are only suitable for fire-hazardous places with a clearance height of less than 8 meters, light hazard level and medium hazard level 1; 4. When the permeable alloy welding points of the bottom cover are melted and the bottom cover falls off, the temperature-sensitive glass parts are still in the inner cover, affecting the response time of the temperature-sensitive glass parts. Summary of the invention

[0004] The purpose of the present invention is to provide a ejection sprinkler and a fire protection system, which can increase the water distribution space of the sprinkler and adapt to fire sites of different danger levels. In the process of spraying water, the structure used for water distribution will not jump, thereby improving the water distribution performance, and can also increase the fire response speed and shorten the fire response time.

[0005] The embodiment of the present invention is achieved as follows:

[0006] In a first aspect, the present invention provides a ejection nozzle, comprising a nozzle sleeve, a cover, a piston and a temperature sensing component; the upper end of the nozzle sleeve is used to connect a water pipe, and the lower end is connected to the cover, the piston is arranged in the nozzle sleeve and can slide in the nozzle sleeve, the piston is provided with a water hole connected to the upper end of the nozzle sleeve, the temperature sensing component is connected to the lower end of the piston and supported on the cover, and the temperature sensing component blocks the water hole;

[0007] After the cover is separated from the nozzle sleeve under fire, the piston can drive the temperature sensing component to slide downward and extend out of the nozzle sleeve. The temperature sensing component can release the blockage of the water hole under fire to allow water to spray out from the water hole.

[0008] In an optional embodiment, the temperature sensing component includes a water separation plate and a connecting rod, one end of the connecting rod is fixedly connected to the piston, and the other end of the connecting rod is fixedly connected to the water separation plate;

[0009] The temperature sensing component also includes a glass piece and a plug seat, one end of the glass piece is connected to the water distribution plate, and the other end is connected to the plug seat, and the plug seat is arranged in the water hole. When the glass piece moves in response to the fire, the plug seat can fall off from the water hole to release the blockage of the water hole.

[0010] In an optional embodiment, the ejection nozzle further includes an elastic member, and the elastic member causes the piston to have a tendency to move downward;

[0011] One end of the elastic member is connected to the upper part of the nozzle sleeve, and the other end is connected to the upper end of the piston. The elastic member is in a compressed state to provide a downward thrust to the piston, so that the piston has a tendency to move downward; or, one end of the elastic member is connected to the lower part of the nozzle sleeve, and the other end is connected to the lower end of the piston. The elastic member is in a stretched state to provide a downward pulling force to the piston, so that the piston has a tendency to move downward.

[0012] In an optional embodiment, a protrusion is provided on the inner wall of the bottom of the nozzle sleeve, and the protrusion is used to prevent the piston from falling out of the nozzle sleeve.

[0013] In an optional embodiment, the sealing cover is spot-welded to the lower end of the nozzle sleeve by means of a fusible alloy.

[0014] In an optional embodiment, the ejection nozzle also includes a water collecting ball seat, which includes a water collecting hole, the aperture of which gradually decreases from top to bottom, the water collecting ball seat is arranged at the bottom of the piston and the water collecting hole is communicated with the water through hole, and the temperature sensing component indirectly blocks the water through hole by blocking the water collecting hole.

[0015] In an optional embodiment, the ejection nozzle further includes an O-ring, an O-groove with its center in the axial direction of the piston is provided on the outer peripheral wall of the piston, and the O-ring is arranged in the O-groove.

[0016] In an optional embodiment, the ejection nozzle further includes a threaded joint, which is disposed on the nozzle sleeve and is used for connecting a water pipe.

[0017] In an optional embodiment, the ejection nozzle further comprises a bottom cover located below the sealing cover, wherein the bottom cover is used to seal the lower end of the nozzle sleeve and can fall off from the nozzle sleeve in case of fire.

[0018] In a second aspect, the present invention provides a fire protection system, comprising a ejection nozzle as described in any one of the aforementioned embodiments.

[0019] The beneficial effects of the embodiments of the present invention are:

[0020] The present invention provides a ejection nozzle, comprising a nozzle sleeve, a cover, a piston and a temperature sensing component; the upper end of the nozzle sleeve is used to connect a water pipe, and the lower end is covered by a cover, the piston is arranged in the nozzle sleeve and can slide in the nozzle sleeve, the piston is provided with a water hole connected to the upper end of the nozzle sleeve, the temperature sensing component is connected to the lower end of the piston and supported on the cover, and the temperature sensing component blocks the water hole; after the cover is separated from the nozzle sleeve under fire, the piston can drive the temperature sensing component to slide downward and extend out of the nozzle sleeve, and the temperature sensing component can release the blockage of the water hole under fire to allow water to leak out of the water hole. In the present invention, when a fire occurs, the temperature sensing component extends from the inside of the nozzle sleeve to respond to the fire. Compared with the glass component in the prior art that responds to the fire inside the outer cover, the fire response speed is improved and the fire response time is shortened. In addition, the temperature sensing component also has a water distribution function, and the temperature sensing component is connected to the piston, so it will not jump during the water distribution process, thereby improving the water distribution performance. In addition, the existing ejection nozzle has a water distribution plate that moves down to a short distance below the ceiling, so the water distribution is affected by the space, and is only suitable for fire places with a net space height of less than 8 meters and a low hazard level. The temperature sensing component in the present invention can be extended from the nozzle sleeve and moved down to a long distance below the ceiling, so the water distribution is not affected by the space, and is suitable for fire places with a large space height range and a high hazard level. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A static schematic diagram of an ejection nozzle provided in an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the ejection nozzle provided by an embodiment of the present invention;

[0024] Figure 3 A schematic diagram of water spraying by an ejection nozzle provided in an embodiment of the present invention.

[0025] icon:

[0026] 100-nozzle sleeve; 110-protrusion; 200-sealing cap; 300-piston; 310-water hole; 400-temperature sensing component; 410-water distribution plate; 420-connecting rod; 430-glass component; 440-plug seat; 500-water collecting ball seat; 510-water collecting hole; 600-O-ring; 700-threaded joint; 800-spring; 900-positioning ring; 1000-bottom cover. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] This embodiment provides a ejection nozzle for an automatic sprinkler fire extinguishing system in a fire protection system. The fire protection system also includes an automatic fire alarm system, an emergency lighting system, a fire hydrant system, a smoke exhaust system, a fireproof rolling shutter door system, a fire accident broadcasting system, and an intercom system.

[0034] like Figure 1 , 2 As shown, the ejection nozzle provided in this embodiment includes a nozzle sleeve 100, a cover 200, a piston 300 and a temperature sensing component 400; the upper end of the nozzle sleeve 100 is used to connect the water pipe, and the lower end is connected to the cover 200. In the quasi-working state, the temperature sensing component 400 is enclosed in the nozzle sleeve 100 by the cover 200, the piston 300 is arranged in the nozzle sleeve 100 and can slide in the nozzle sleeve 100, and a water hole 310 connected to the upper end of the nozzle sleeve 100 is arranged at the center of the piston 300. The water hole 310 passes through the piston 300 up and down in the axial direction. The temperature sensing component 400 is connected to the lower end of the piston 300 and is supported on the cover 200. 00, in the quasi-working state, the temperature sensing component 400 blocks the water hole 310; after the cover 200 is separated from the sprinkler sleeve 100 under fire, the piston 300 can drive the temperature sensing component 400 to slide downward and make the temperature sensing component 400 extend out of the sprinkler sleeve 100, and the temperature sensing component 400 can release the blockage of the water hole 310 under fire to allow water to flow out of the water hole 310. After the cover 200 is separated from the sprinkler sleeve 100 under fire, the piston 300 slides downward, the temperature sensing component 400 slides out from the bottom of the sprinkler sleeve 100 and releases the blockage of the water hole 310 under fire, and then disperses the water coming out of the water hole 310, thereby achieving fire extinguishing. In detail, the pressure borne by the cover 200 is substantially equal to the force connecting the cover 200 and the nozzle sleeve, so that when no fire occurs, the support force of the cover 200 to the piston 300 and the temperature sensing component 400 can just maintain the balance of the internal components of the ejection nozzle.

[0035] It can be understood that in this embodiment, when a fire occurs, the cover 200 is separated from the bottom of the nozzle sleeve. After losing the supporting force of the cover 200, the temperature sensing component 400 extends from the inside of the nozzle sleeve 100, so that the temperature sensing component 400 can be located outside the nozzle sleeve 100 to respond to the fire. Compared with the temperature sensing glass part 430 in the related art that responds to the fire inside the cover body, the sensitivity of the temperature sensing component 400 to temperature is improved, thereby improving the response speed of the temperature sensing component 400 to the fire and shortening the response time of the fire.

[0036] Furthermore, the temperature sensing component 400 also includes a water diversion tray 410, a connecting rod 420, a glass piece 430 and a plug seat 440. The water diversion tray 410 is located below the water outlet direction of the water hole 310 and is connected to the piston 300 through the connecting rod 420. One end of the glass piece 430 is connected to the water diversion tray 410, and the other end is connected to the plug seat 440. The plug seat 440 is arranged at the water outlet of the water hole 310 to prevent water from flowing out in a quasi-working state. When the glass piece 430 is actuated under fire, the plug seat 440 can fall off from the water hole 310 to release the blockage of the water hole 310. In detail, the water diversion plate 410 is circular in shape and is provided with gaps in multiple radial directions so that water can be dispersed in all directions when passing through the water diversion plate 410. In addition, four connecting rods 420 are provided in the present embodiment, and the four connecting rods 420 are all arc-shaped. One end of the connecting rod 420 is fixedly connected to the water diversion plate 410, preferably connected to the center of the water diversion plate 410, and the other end is fixedly connected to the piston 300, preferably connected to the edge of the lower end of the piston 300. Since the connecting rod 420 is arc-shaped, the water coming out of the water through hole 310 can avoid hitting the connecting rod 420 as much as possible.

[0037] It is understandable that when a fire occurs, the cover 200 is separated from the nozzle sleeve 100, and the temperature sensing component 400 is pushed out of the nozzle sleeve 100 by the piston 300, and the glass component 430 senses the external fire. When the temperature rises to a certain level, the glass component 430 moves, and the plug seat 440 slides down from the water hole 310, and water sprays out from the water hole 310 and hits the water distribution plate 410. The water distribution plate 410 disperses the water to all directions to extinguish the fire. Specifically, since the connecting rod 420 is fixedly connected to the water distribution plate 410 and the piston 300, When water is sprayed onto the water distribution plate 410, the water distribution plate will not jump due to the impact of water pressure, thereby improving the water distribution performance. In addition, since the water distribution plate 410 of the existing ejection sprinkler is moved down to a relatively close distance below the suspended ceiling, the water distribution is affected by the space, and is only suitable for fire places with a net space height of less than 8 meters and a low hazard level. The water distribution plate 410 in the present invention can be moved down to a relatively long distance below the suspended ceiling after extending from the sprinkler sleeve 100, so the water distribution is not affected by the space, and is suitable for fire places with a large space height range and a high hazard level.

[0038] Furthermore, a protrusion 110 is provided on the inner wall at the bottom of the nozzle sleeve 100, and the protrusion 110 is used to prevent the piston 300 from falling out of the nozzle sleeve 100. It is understandable that when water is sprayed downward from the water hole 310, it will exert downward pressure on the piston 300, and the piston 300 will continue to fall downward. The protrusion 110 can make the piston 300 stop after it drops to a certain position. It is worth noting that the distance the piston 300 drops is related to the position where the temperature sensing component 400 extends out of the nozzle sleeve 100. In other embodiments, the protrusion 110 can be set at different positions or the protrusion 110 can be set as a movable structure to control the position where the temperature sensing component 400 extends out, so as to meet the fire extinguishing requirements of different space heights.

[0039] Specifically, the cover 200 and the lower end of the nozzle sleeve 100 are spot welded by a fusible alloy. It is understandable that the fusible alloy will melt when a fire occurs, thereby separating the cover 200 and the nozzle sleeve 100. The fusible alloy used in this embodiment is an alloy based on bismuth elements, and the melting point is 47°C, 70°C, 92°C, 120°C, etc. The fusible alloy with the corresponding melting point can be selected according to actual conditions or needs.

[0040] In the present embodiment, the ejection nozzle also includes a water-collecting ball seat 500, which is arranged at the lower part of the piston 300. Preferably, the upper part of the water-collecting ball seat 500 is sleeved on the side wall of the lower part of the water hole 310, and the outer wall of the water-collecting ball seat 500 is tightly fitted with the side wall of the water hole 310. The water-collecting ball seat 500 has a water-collecting hole 510, and the aperture of the water-collecting hole 510 gradually decreases from top to bottom, and the water-collecting hole 510 is communicated with the water hole 310. The temperature sensing component 400 indirectly blocks the water hole 310 by blocking the water-collecting hole 510. In detail, the plug seat 440 in the temperature sensing component 400 is indirectly blocked by being arranged in the water-collecting hole 510. In detail, an internal thread is provided on the lower side wall of the water through hole 310, and an external thread is provided on the upper outer wall of the water collecting ball seat 500, so that the water collecting ball seat 500 is threadedly connected to the piston 300, and water enters the water through hole 310 and then flows out of the water collecting hole 510. Since the water collecting hole 510 is an inverted cone, the diameter gradually decreases from top to bottom. Therefore, after passing through the water collecting hole 510, water will form high-pressure water, and the spraying speed will be accelerated. After reaching the water distribution plate 410, the dispersion area is larger, and the fire extinguishing effect is better. It can be understood that the connecting rod 420 of the temperature sensing component 400 can also be indirectly fixedly connected to the piston 300 through the water collecting ball seat 500.

[0041] Furthermore, the ejection nozzle further includes an O-ring 600, and an O-groove with its center in the axial direction of the piston 300 is provided on the outer peripheral wall of the piston 300, and the O-ring 600 is disposed in the O-groove. In detail, in this embodiment, two circles of O-grooves are provided, which are respectively located in the upper half and the lower half of the piston 300. It can be understood that the function of the O-ring 600 is to seal the gap between the piston 300 and the nozzle sleeve 100.

[0042] In this embodiment, the ejection nozzle further includes a threaded joint 700, which is arranged on the top surface of the nozzle sleeve 100 and is used to connect the water pipe. In detail, the threaded joint 700 and the nozzle sleeve 100 are connected by threads.

[0043] Furthermore, the ejection nozzle further includes an elastic member, which makes the piston 300 have a tendency to move downward; one end of the elastic member is connected to the upper part of the nozzle sleeve, and the other end is connected to the upper end of the piston 300, and the elastic member is in a compressed state to provide a downward thrust to the piston 300, so that the piston 300 has a tendency to move downward; or one end of the elastic member is connected to the lower part of the nozzle sleeve, and the other end is connected to the lower end of the piston 300, and the elastic member is in a stretched state to provide a downward pulling force to the piston 300, so that the piston 300 has a tendency to move downward. The elastic member can be a spring, a tension spring, or other components that can be stretched or compressed and have an automatic reset function.

[0044] Specifically, in this embodiment, the elastic member is a spring 800, and the ejection nozzle further includes a positioning ring 900, which is arranged inside the nozzle sleeve 100 and above the piston 300, and the spring 800 is arranged between the positioning ring 900 and the piston 300 and is in a compressed state. It can be understood that the purpose of arranging the compression spring 800 in the nozzle sleeve 100 is to increase the thrust of the piston 300, and quickly push the temperature sensing component 400 out of the nozzle sleeve 100, and of course, to prevent the gravity of the piston 300 and the temperature sensing component 400 and the water pressure from being insufficient to push the temperature sensing component 400 out of the nozzle sleeve 100, and then get stuck.

[0045] It is understandable that the positioning ring 900 is only for more convenient installation of the spring, and it is also possible to have no positioning ring, for example, directly connecting the upper end of the spring 800 to the nozzle sleeve 100.

[0046] In addition, the concealed ejection sprinkler also includes a bottom cover 1000 located below the cover 200. The bottom cover 1000 is used to cover the lower end of the sprinkler sleeve 100 and can fall off from the sprinkler sleeve 100 in a fire situation and be used to be flush with the external ceiling. It can be understood that the bottom cover 1000 is flush with the ceiling, making the ceiling decoration more beautiful.

[0047] This embodiment also provides a working principle of the ejection nozzle, which is as follows:

[0048] When the ejection nozzle is in the quasi-working state, the spring 800 is in a compressed state, the water collecting ball seat 500 and above is filled with pressurized water, and the temperature sensing component 400 is inside the nozzle sleeve 100. In the ejection nozzle, the inner cavity is filled with the water pressure of the pressurized water, plus the elastic force of the spring 800 when it is in a compressed state, plus the gravity of the spring 800, the piston 300 and the temperature sensing component 400, which is equal to the friction between the piston 300 and the nozzle sleeve 100 plus the support provided by the sealing cover 200 and the sleeve end face due to the fixation of the four easy-to-use alloy welding points. At this time, the static force is in a state of equilibrium, and the parts spring 800, piston 300, and nozzle are all in a static state. The static position is as follows: Figure 1 Position shown.

[0049] When a fire occurs, the temperature below the ceiling rises, and after the fusible alloy welding points at the four points on the end surface of the cover 200 and the nozzle sleeve 100 melt, the cover 200 and the bottom cover 1000 fall off, and the elastic force + water pressure + the gravity of the piston 300 and the temperature sensing component 400 itself is greater than the friction between the piston 300 and the inner wall of the nozzle sleeve 100. Under the action of the force, the piston 300 will move down to the protrusion 110 set in the sleeve, and the temperature sensing component 400 will be ejected from the inside of the nozzle sleeve 100 to the bottom of the ceiling. At this time, the state is as follows: Figure 2 shown.

[0050] At this time, the temperature sensing component 400 is completely under the ceiling. As the temperature under the ceiling rises, the glass piece 430 moves, the water collecting ball seat 500 and the glass piece 430 fall off, and the water in the pipe network is sprayed out through the water collecting hole 510, and then distributed to the surface of the burning object indoors through the water distribution plate 410 to extinguish the fire. At this time, the state of the sprinkler head is as follows: Figure 3 shown.

[0051] The present embodiment provides a ejection nozzle having the following advantages:

[0052] In the present embodiment, when a fire occurs, the temperature sensing component 400 extends from the inside of the nozzle sleeve 100 to respond to the fire. Compared with the glass component 430 in the related art responding to the fire inside the outer cover, the sensitivity of the glass component 430 is improved, the fire response speed is improved, and the fire response time is shortened. In addition, the temperature sensing component 400 also has a water distribution function, and the two ends of the connecting rod 420 of the temperature sensing component 400 are respectively fixedly connected to the water distribution plate 410 and the piston 300 of the temperature sensing component 400. Therefore, the water distribution plate will not jump during the water distribution process, thereby improving the water distribution performance; the existing ejection sprinkler has a relatively close distance from the water distribution plate 410 to the bottom of the ceiling, so the water distribution is affected by the space, and is only suitable for fire places with a net space height of less than 8 meters and a low hazard level. The temperature sensing component 400 in the present invention can be extended from the nozzle sleeve 100 and can be moved down to a relatively long distance below the ceiling. Therefore, the water distribution is not affected by the space, and is suitable for fire places with a large space height range and a high hazard level.

[0053] This embodiment also provides a fire protection system having the ejection nozzle in any of the above embodiments.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A ejection nozzle, characterized in that: It comprises a nozzle sleeve, a sealing cover, a piston and a temperature sensing component; the upper end of the nozzle sleeve is used to connect a water pipe, and the lower end is connected to the sealing cover; the piston is arranged in the nozzle sleeve and can slide in the nozzle sleeve; the piston is provided with a water through hole connected to the upper end of the nozzle sleeve; the temperature sensing component is connected to the lower end of the piston and supported on the sealing cover; the temperature sensing component blocks the water through hole; After the cover is separated from the nozzle sleeve under fire, the piston can drive the temperature sensing component to slide downward and extend out of the nozzle sleeve. The temperature sensing component can release the blockage of the water hole under fire to allow water to spray out from the water hole.

2. The ejection nozzle according to claim 1, characterized in that: The temperature sensing component includes a water distribution plate and a connecting rod, one end of the connecting rod is fixedly connected to the piston, and the other end is fixedly connected to the water distribution plate; The temperature sensing component also includes a glass piece and a plug seat, one end of the glass piece is connected to the water distribution plate, and the other end is connected to the plug seat, and the plug seat is arranged in the water hole. When the glass piece moves in response to the fire, the plug seat can fall off from the water hole to release the blockage of the water hole.

3. The ejection nozzle according to claim 1, characterized in that: The ejection nozzle also includes an elastic member, which enables the piston to have a tendency to move downward; One end of the elastic member is connected to the upper part of the nozzle sleeve, and the other end is connected to the upper end of the piston. The elastic member is in a compressed state to provide a downward thrust to the piston, so that the piston has a tendency to move downward; or, one end of the elastic member is connected to the lower part of the nozzle sleeve, and the other end is connected to the lower end of the piston. The elastic member is in a stretched state to provide a downward pulling force to the piston, so that the piston has a tendency to move downward.

4. The ejection nozzle according to claim 1, characterized in that: A protrusion is arranged on the inner wall of the bottom of the nozzle sleeve, and the protrusion is used to prevent the piston from falling out of the nozzle sleeve.

5. The ejection nozzle according to claim 1, characterized in that: The sealing cover is spot-welded to the lower end of the nozzle sleeve by means of fusible alloy.

6. The ejection nozzle according to claim 1, characterized in that: The ejection nozzle also includes a water-collecting ball seat, which includes a water-collecting hole. The aperture of the water-collecting hole gradually decreases from top to bottom. The water-collecting ball seat is arranged at the bottom of the piston and the water-collecting hole is communicated with the water-through hole. The temperature sensing component indirectly blocks the water-through hole by blocking the water-collecting hole.

7. The ejection nozzle according to claim 1, characterized in that: The ejection nozzle also includes an O-ring. An O-groove with its center in the axial direction of the piston is arranged on the outer peripheral wall of the piston, and the O-ring is arranged in the O-groove.

8. The ejection nozzle according to claim 1, characterized in that: The ejection nozzle also includes a threaded joint, which is arranged on the nozzle sleeve and is used for connecting a water pipe.

9. The ejection nozzle according to claim 1, characterized in that: The ejection nozzle also includes a bottom cover located below the sealing cover, and the bottom cover is used to seal the lower end of the nozzle sleeve and can fall off from the nozzle sleeve in a fire situation.

10. A fire protection system, characterized in that: A ejection nozzle comprising any one of claims 1 to 9.

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