WO2021172801A1

WO2021172801A1 - Automatic fire extinguishing system for small space with glass bulb hit device

Info

Publication number: WO2021172801A1
Application number: PCT/KR2021/001911
Authority: WO
Inventors: In Ji Jung; Se Hun Park
Original assignee: Yooksong Co., Ltd.
Priority date: 2020-02-27
Filing date: 2021-02-15
Publication date: 2021-09-02
Also published as: KR102154675B1

Abstract

An automatic fire extinguishing system for small space is disclosed. The automatic fire extinguishing system for small space includes an automatic fire extinguishing device for small space installed in a switch box and including a glass bulb between a hit member and a compression spring, a hit device breaking the glass bulb, and a bracket on which the hit device is installed while the bracket is supported in the automatic fire extinguishing device for small space. The hit device includes an electromagnetic valve operated by an external control such as a fire, a hit operation rod descending as the electromagnetic valve operates, a hit rod hitting the glass bulb, and a connection portion connecting a lower end of the hit operation rod to an upper end of the hit rod.

Description

AUTOMATIC FIRE EXTINGUISHING SYSTEM FOR SMALL SPACE WITH GLASS BULB HIT DEVICE

The present disclosure relates to an automatic fire extinguishing system for small space. In particular, the present disclosure relates to an automatic fire extinguishing system for small space with a glass bulb hit device.

A related art automatic fire extinguishing device for small space is disclosed in, for example, the following patent document 1 (Korean Patent Application Publication No. 10-2019-0130862) (see FIGS. 10 and 11).

An automatic fire extinguishing device 100 for small space disclosed in the patent document 1 (Korean Patent Application Publication No. 10-2019-0130862) extinguishes a fire by discharging a fire extinguishing agent by the hit when the fire occurs in a switchboard, various equipments or distribution boxes installed in an electrical room, a substation box, a refrigerator, a server rack, and an electrical panel. When a fire occurs in the small space in which the automatic fire extinguishing device 100 is installed, the heat breaks a glass bulb 150 installed between a fixture 135 and a glass bulb supporter 140 through a scattering hole 113 of a housing body 111. Hence, as a compression spring 120 compressed between an upper end inside the housing body 111 and a hit member 130 is restored, the hit member 130 on which the fixture 135 is installed moves toward a fire extinguishing container 200. In this instance, while the glass bulb supporter 140 supported by a fixing pin 160 does not move, the hit member 130 is moved by an elastic force of the compression spring 120. Due to the movement of the hit member 130, a hit pin 136 instantaneously hits and ruptures a blocking layer 210 blocking an entrance of the fire extinguishing container 200.

As the blocking layer 210 is ruptured, the fire extinguishing agent that is stored in the fire extinguishing container 200 in a compressed state is discharged through a ruptured portion of the blocking layer 210 and passes through the scattering hole 113 to thereby achieve the scattering.

However, even in the case of a glass bulb automatic fire extinguishing device, when a fire occurs, it takes a significant amount of time to receive heat, that is enough for a heat sensitive liquid to reach a predetermined temperature, from a flame. Hence, it is difficult to initially extinguish the fire. In addition, when an ignition place is far from a firefighting equipment, there is a problem that the initial extinguishment of the fire is more difficult.

An operating temperature of the glass bulb is currently 68 °C, but the glass bulb is broken only when it is substantially 180 to 210 °C . In other words, the glass bulb automatic fire extinguishing device extinguishes the fire after being burned out. That is, this is the case of mending　the　barn　after　the　horse　is　stolen.

Another related art for solving these problems, the following patent document 2 (Korean Patent Application Publication No. 10-2012-0134353) is proposed (see FIGS. 12 and 13).

A smart head automatic operation device of a fire extinguishing device disclosed in the patent document 2 (Korean Patent Application Publication No. 10-2012-0134353) is configured such that a small-sized electromagnetic valve 41 is installed on a valve body 21, an electromagnetic valve shaft 42 is installed to pass through a spring 43 installed in a vertical direction, and then a hit rod 44 is installed under the spring 43.

By connecting the electromagnetic valve 41 to a controller connected to a fire decoder, the electromagnetic valve 41 operates in response to signals of the controller at the moment of fire. When the hit rod 44 breaks and separates a glass bulb 34, a restraint of a vertical rod 31 closing an ejection hole 213 is released. The vertical rod 31 pushes a horizontal rod 32 to an inclined surface 31a, which is formed at 45 °, by an elastic restoring force of a compression spring 23 and instantaneously rises to open the ejection hole 213.

As described above, when the ejection hole 213 is opened, a compressed gas or a powdered medicine of a fire extinguishing container 1 instantaneously rises through a siphon tube 11 and is injected to the outside. Hence, the firefighting equipment can initially extinguish the fire.

However, because the firefighting equipment is configured such that an internal pressure of the fire extinguishing container 1 is supported by only a glass bulb 34, there is a high risk of malfunction of the fire extinguishing container 1 due to a defect, etc. of the glass bulb 34.

The hit rod 44 of the patent document 2 can be applied to the fire extinguishing device of the patent document 1, but the following problem may occur.

The patent document 2 is configured such that the hit rod 44 is installed inside a frame 33 and hits the glass bulb 34. Therefore, if the hit rod 44 of the patent document 2 is disposed inside the housing body 111 of the patent document 1, the glass bulb may be broken. Hence, if the compression spring 120 operates, the compression spring 120 may apply a great impact on the hit rod 44.

Accordingly, if a force of the spring applies a significant impact on the hit rod 44 that moves up and down only in the vertical direction, the hit rod 44 may be bent or broken. In this case, the force of the spring is consumed, and thus a penetration force of the spring to the blocking layer is very reduced.

When the penetration force to the blocking layer is reduced, the fire extinguishing agent is not properly discharged from the fire extinguishing container. Thus, there may occur a big problem that it is difficult to initially extinguish the fire since the fire extinguishing agent is not sufficiently discharged.

[Prior Art Document]

[Patent Document]

(Patent Document 1) Korean Patent Application Publication No. 10-2019-0130862

(Patent Document 2) Korean Patent Application Publication No. 10-2012-0134353

An object of the present disclosure is to address the above-described and other needs and/or problems.

Another object of the present disclosure is to provide an automatic fire extinguishing system for small space with a glass bulb hit device capable of forcing a hit rod to hit a glass bulb, preventing a force of a compression spring from being reduced by interference of the hit rod after the hit of the glass bulb, and discharging a fire extinguishing agent through a sufficient penetration force to a blocking layer.

The technical objects to be achieved by the present disclosure are not limited to those that have been described hereinabove merely by way of example, and other technical objects that are not mentioned can be clearly understood from the following descriptions by those skilled in the art, to which the present disclosure pertains.

In one aspect, there is provided an automatic fire extinguishing system for small space comprising an automatic fire extinguishing device for small space installed in a switch box, the automatic fire extinguishing device for small space including a glass bulb between a hit member and a compression spring; a hit device breaking the glass bulb; and a bracket on which the hit device is installed while the bracket is supported in the automatic fire extinguishing device for small space, wherein the hit device includes an electromagnetic valve operated by an external control such as a fire, a hit operation rod descending as the electromagnetic valve operates, a hit rod hitting the glass bulb, and a connection portion connecting a lower end of the hit operation rod to an upper end of the hit rod, wherein the connection portion includes an U-shaped groove portion formed at the lower end of the hit operation rod, the upper end of the hit rod being disposed in the U-shaped groove portion, a hinge pin connecting the U-shaped groove portion to the hit rod, a hit rod rotation allowing portion which allows the hit rod to rotate only in a direction colliding and pushing the hit rod when the compression spring is released, and a torsion coil spring elastically pressurizing the hit rod against the U-shaped groove portion toward a non-rotation direction of the hit rod, wherein the hit rod rotation allowing portion includes a rotation allowing chamfer portion in which an upper surface of the hit rod faces an upper surface of the U-shaped groove portion, and one surface of the rotation allowing chamfer portion is chamfered.

A position determination chamfer portion may be formed on one side of an outer circumferential surface of the U-shaped groove portion and may determine a position of a rotation direction of the hit rod. The bracket may include a first bracket plate on which one side of the electromagnetic valve is installed, and a second bracket plate formed by bending the first bracket plate and supported in the automatic fire extinguishing device for small space. The second bracket plate may face the position determination chamfer portion.

A ㄱ-shaped groove may be formed in a longitudinal direction of one side of the hit rod, and the torsion coil spring may be disposed in the ㄱ-shaped groove.

The automatic fire extinguishing device for small space may further include a fire extinguishing container containing a fire extinguishing agent, a hit nozzle into which the fire extinguishing agent is discharged, an elbow tube including an end connected to the fire extinguishing container and other end connected to the hit nozzle, and a pressure gauge installed in the elbow tube, wherein a blocking layer is installed at the other end of the elbow tube to block the fire extinguishing agent.

The present disclosure has the following effects.

An automatic fire extinguishing system for small space according to the present disclosure can quickly extinguish internal fires such as a switch box by moving a hit pin by a restoring force of a compression spring when a glass bulb is broken, passing through a blocking layer, and spraying a fire extinguishing agent. In addition, because a hit rob, that forcibly breaks the glass bulb when it reaches a preset fire detection temperature, does not reduce the restoring force of the compression spring and rotates, the automatic fire extinguishing system for small space according to the present disclosure can quickly extinguish the fire by sufficiently spraying the fire extinguishing agent while maintaining a penetration force of the blocking layer as it is.

Further, the automatic fire extinguishing system for small space according to the present disclosure can accurately hit and break the glass bulb without bending the glass bulb when the hit rob hits the glass bulb, by forming a rotation allowing chamfer portion so that the hit rod rotates in only one direction and elastically pressurizing the hit rod in the non-rotation direction using a torsion coil spring.

Further, since a position determination chamfer portion is formed on one side of an outer circumferential surface of a groove portion of a hit operation rod and is disposed to face a surface of a bracket, the position determination chamfer portion can be accurately assembled to the bracket at a rotation allowable position in only one direction of the hit rod.

Further, since a ㄱ-shaped groove is formed in a longitudinal direction of one side of the hit rod, the groove portion does not interfere with rotation of the hit rod due to the accommodation of the torsion coil spring in the ㄱ-shaped groove, and other end of the torsion coil spring can maintain a stable caught state.

Since a fire extinguishing container and a hit nozzle are connected using an elbow tube, the hit nozzle can be disposed as close as possible the position of concern for fire. Hence, fire suppression efficiency can be greatly improved even at low temperature detection.

Since a pressure gauge can be installed by using the elbow tube, a state of a fire extinguishing agent stored in the fire extinguishing container can be visually checked and managed.

Effects that could be achieved by the present disclosure are not limited to those that have been described hereinabove merely by way of example, and other effects and advantages of the present disclosure will be more clearly understood from the following description by a person skilled in the art to which the present disclosure pertains.

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the principle of the disclosure.

FIG. 1 is a front view schematically illustrating an automatic fire extinguishing system for small space according to an embodiment of the present disclosure.

FIGS. 2 to 4 are front cross-sectional views illustrating an operation state of an automatic fire extinguishing system of FIG. 1.

FIGS. 5 and 6 are prospective views of an automatic fire extinguishing device for small space of FIG. 1 and illustrate it depending on a position of a pressure gauge.

FIGS. 7 and 8 are prospective views illustrating before and after a hit operation of a hit device of FIG. 1.

FIG. 9 is an exploded prospective view separately illustrating main components of a hit device.

FIGS. 10 and 11 are cross-sectional views illustrating before and after the operation of a related art automatic fire extinguishing device for small space.

FIG. 12 is a cross-sectional view illustrating an entire configuration of a smart head automatic operation device of another related art fire extinguishing device.

FIG. 13 is a cross-sectional view illustrating an ejection hole in a smart head automatic operation device of a fire extinguishing device of FIG. 12.

Reference will now be made in detail to embodiments of the disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. In general, a suffix such as "module" and "unit" may be used to refer to elements or components. Use of such a suffix herein is merely intended to facilitate description of the present disclosure, and the suffix itself is not intended to give any special meaning or function. It will be noted that a detailed description of known arts will be omitted if it is determined that the detailed description of the known arts can obscure the embodiments of the disclosure. The accompanying drawings are used to help easily understand various technical features and it should be understood that embodiments presented herein are not limited by the accompanying drawings. As such, the present disclosure should be construed to extend to any alterations, equivalents and substitutes in addition to those which are particularly set out in the accompanying drawings.

The terms including an ordinal number such as first, second, etc. may be used to describe various components, but the components are not limited by such terms. The terms are used only for the purpose of distinguishing one component from other components.

When any component is described as "being connected" or "being coupled" to other component, this should be understood to mean that another component may exist between them, although any component may be directly connected or coupled to the other component. In contrast, when any component is described as "being directly connected" or "being directly coupled" to other component, this should be understood to mean that no component exists between them.

A singular expression can include a plural expression as long as it does not have an apparently different meaning in context.

In the present disclosure, terms "include" and "have" should be understood to be intended to designate that illustrated features, numbers, steps, operations, components, parts or combinations thereof are present and not to preclude the existence of one or more different features, numbers, steps, operations, components, parts or combinations thereof, or the possibility of the addition thereof.

In the drawings, the sizes of the components may be exaggerated or reduced for convenience of explanation. For example, the size and the thickness of each component illustrated in the drawings are arbitrarily illustrated for convenience of explanation, and thus the present disclosure is not limited thereto unless specified as such.

If any embodiment is implementable differently, a specific order of processes may be performed differently from the order described. For example, two consecutively described processes may be performed substantially at the same time, or performed in the order opposite to the described order.

In the following embodiments, when layers, areas, components, etc. are connected, the following embodiments include both the case where layers, areas, and components are directly connected, and the case where layers, areas, and components are indirectly connected with other layers, areas, and components intervening between them. For example, when layers, areas, components, etc. are electrically connected, the present disclosure includes both the case where layers, areas, and components are directly electrically connected, and the case where layers, areas, and components are indirectly electrically connected with other layers, areas, and components intervening between them.

FIG. 1 is a front view schematically illustrating an automatic fire extinguishing system for small space according to an embodiment of the present disclosure. FIGS. 2 to 4 are front cross-sectional views illustrating an operation state of an automatic fire extinguishing system of FIG. 1. FIGS. 5 and 6 are prospective views of an automatic fire extinguishing device for small space of FIG. 1 and illustrate it depending on a position of a pressure gauge. FIGS. 7 and 8 are prospective views illustrating before and after a hit operation of a hit device of FIG. 1. FIG. 9 is an exploded prospective view separately illustrating main components of a hit device.

An automatic fire extinguishing system for small space according to an embodiment of the present disclosure is an artificial intelligent fire extinguishing system that can find small embers and initially extinguish a fire when the fire occurs in a sealed box, an unrecognized space, etc.

Assuming that the temperature of a glass bulb is 68 °C, the glass bulb would be broken when the temperature of the glass bulb rises to 180 to 210 °C .

If a fire extinguishing system previously sets a predetermined fire detection temperature (e.g., 55 °C) and detects the fire detection temperature, the fire extinguishing system may send a fire warning signal (e.g., activate a visual warning light at the site to warn of a fire, and warn managers of a fire through communication using an application) to prevent a fire in advance.

When the fire extinguishing system detects a high temperature (e.g., 85 °C) after previously detecting a low temperature, the fire extinguishing system may decide that a fire occurs. The fire extinguishing system may initially extinguish the fire by forcibly breaking a glass bulb to thereby prevent a big fire. In this instance, the fire extinguishing system can send other signals (e.g., ESS power off) and thus can prevent a big fire.

This is an initial fire extinguishing system of a new paradigm that can become a leader in the era of the fourth industrial revolution.

Referring to FIG. 1, an automatic fire extinguishing system for small space according to an embodiment of the present disclosure may include an automatic fire extinguishing device 100 for small space installed in a sealed box, a hit device 400 that forcibly breaks a glass bulb 150 of the automatic fire extinguishing device 100 for small space, and a bracket 600 on which the hit device 400 is installed while the bracket 600 is supported in the automatic fire extinguishing device 100 for small space.

Referring to FIGS. 1, 2, 6 and 7, the automatic fire extinguishing device 100 for small space according to an embodiment of the present disclosure may include a hit nozzle 170 and a fire extinguishing container 200. The hit nozzle 170 may form an appearance of the automatic fire extinguishing device 100 for small space. The fire extinguishing container 200 may store a fire extinguishing agent in a compressed state. The automatic fire extinguishing device 100 for small space may further include an elbow tube 180 connecting the hit nozzle 170 and the fire extinguishing container 200.

The hit nozzle 170 may include a housing 110, a compression spring 120, a hit member 130, and the glass bulb 150. The housing 110 may include a housing body 111 including scattering holes 113 into which the fire extinguishing agent is scattered, and a connection tube 114 coupled with the housing body 111. The compression spring 120 may be installed on an upper part inside the housing body 111. The hit member 130 may be installed inside the housing body 111. The glass bulb 150 may be installed inside the hit member 130.

The hit member 130 may include a hit member body 131, a fixture 135, a hit pin 136, a glass bulb supporter 140, and a fixing pin 160. The hit member body 131 may have slot-shaped ejection holes 133. The fixture 135 and the hit pin 136 may be installed on and under the hit member body 131. The glass bulb supporter 140 may be disposed inside the hit member body 131. The fixing pin 160 may be coupled to the connection tube 114 so that the fixing pin 160 passes through the hit member body 131.

The elbow tube 180 may allow the hit nozzle 170 to be disposed as close as possible to an ignition point. In addition, a pressure gauge 190 can be installed, and thus a manager can check and manage a state of the extinguishing agent of the fire extinguishing container 200 with the naked eye.

When the elbow tube 180 is used, a blocking layer 181 may be installed at other end.

When the fire extinguishing container 200 is directly connected to the hit nozzle 170, the blocking layer 210 may be installed in the fire extinguishing container 200 in the same manner as the related art. In this case, the pressure gauge may not be installed.

Referring to FIGS. 7 to 9, the hit device 400 may include an electromagnetic valve 410, a hit operation rod 430, a hit rod 450, and a connection portion 470. The electromagnetic valve 410 may be operated by an external control such as a fire. The hit operation rod 430 may descend as the electromagnetic valve 410 operates. The hit rod 450 may hit the glass bulb 150. The connection portion 470 may connect a lower end of the hit operation rod 430 to an upper end of the hit rod 450.

The connection portion 470 may include an U-shaped groove portion 471, a hinge pin 475, a hit rod rotation allowing portion 477, and a torsion coil spring 479. The U-shaped groove portion 471 may be formed at a lower end of the hit operation rod 430, and an upper end of the hit rod 450 may be disposed in the U-shaped groove portion 471. The hinge pin 475 may connect the U-shaped groove portion 471 to the hit rod 450. The hit rod rotation allowing portion 477 may allow the hit rod 450 to rotate only in a direction colliding and pushing the hit rod 450 when the compression spring 120 is released. The torsion coil spring 479 may elastically pressurize the hit rod 450 against the U-shaped groove portion 471 toward a non-rotation direction of the hit rod.

The U-shaped groove portion 471 may be formed to be greater than a diameter of the hit operation rod 430.

The groove portion 471 may be a U-shaped groove that is opened in the left, right, and down.

The hit rod rotation allowing portion 477 may include a rotation allowing chamfer portion in which an upper surface 451 of the hit rod 450 faces an upper surface 472 of the groove portion 471, and one surface of the rotation allowing chamfer portion may be chamfered.

The hit rod rotation allowing portion 477 may be formed in a chamber shape. However, even if the hit rod rotation allowing portion 477 is implemented in a convex round shape, the hit rod rotation allowing portion 477 can have the same effect.

When the hit rod 450 is to rotate in a direction in which the upper surface 451 of the hit rod 450 faces the upper surface 472 of the groove portion 471 (toward a compressed direction of the compression spring), the hit rod 450 may be caught and fail to rotate.

The torsion coil spring 479 may elastically pressurize the hit rod 450 so that the hit rod 450 does not rotate in its rotation direction. Hence, the hit rod 450 can serve to accurately hit the glass bulb 150 without bending the glass bulb 150 while the hit rod 450 is in a straight shape.

As illustrated in FIG. 9, a ㄱ-shaped groove 453, in which the torsion coil spring 479 is disposed in a longitudinal direction of one side of the hit rod 450, may be formed.

The ㄱ-shaped groove 453 may be a space in which the torsion coil spring 479 is accommodated. The ㄱ-shaped groove 453 may prevent interference as much as possible when the hit rod 450 rotates about the groove portion 471.

As illustrated in FIG. 1, the bracket 600 may include a first bracket plate 610 and a second bracket plate 630. One side of the electromagnetic valve 410 may be installed on the first bracket plate 610. The second bracket plate 630 may be formed by bending the first bracket plate 610 twice, and may be supported by being inserted into the hit nozzle 170 of the automatic fire extinguishing device 100.

The bracket 600 may further include a third bracket plate 650 and a fourth bracket plate 670. The third bracket plate 650 may be formed by bending an end of the second bracket plate 630 by 90 °. The fourth bracket plate 670 may be formed by bending the third bracket plate 650 by 90 ° and may be parallel to the first and

second bracket plates

610 and 630.

Thus, the second and

fourth bracket plates

630 and 670 may be inserted into a front end of the hit nozzle 170 and may be fastened or released by tightening or loosening a screw 640 fastened to the third bracket plate 650.

A temperature sensor TS may be installed on the fourth bracket plate 670. The temperature sensor TS may sense a temperature inside a sealed box as close as possible and may send the sensed temperature to a controller.

A position determination chamfer portion 471a may be formed on one side of an outer circumferential surface of the groove portion 471 and may determine a position of the rotation direction of the hit rod 450.

As illustrated in FIG. 1, the position determination chamfer portion 471a and the second bracket plate 630 may be assembled by facing each other.

That is, when the electromagnetic valve 410 is fastened to the first bracket plate 610, the position determination chamfer portion 471a may be assembled by facing the second bracket plate 630.

Thus, when the compression spring 120 is restored, the hit rod 450 may reliably hold its positions only in the direction, in which the hit rod 450 rotates along the hit rod rotation allowing portion 477, to prevent misassembly.

The operation of the automatic fire extinguishing system for small space according to an embodiment of the present disclosure described above is described below with reference to FIGS. 2 and 3.

First, as illustrated in FIG. 2, before a fire occurs, a lower end of the hit rod 450 may be disposed as close as possible to the glass bulb 150 through the scattering holes 113 and the ejection holes 133.

If the fire occurs in this state, the temperature sensor TS may sense a temperature and send the sensed temperature to the controller. In this case, the hit device 400 may operates as illustrated in FIG. 3.

That is, when the electromagnetic valve 410 operates and the hit operation rod 430 descends, the hit rod 450 may hit and break the glass bulb 150.

When the glass bulb 150 is broken, the compression spring 120 in a compressed state may push the hit member 130 down by the restoring force as illustrated in FIG. 4.

That is, the glass bulb supporter 140 may not move by the fixing pin 160, and the hit member body 131, the fixture 135 and the hit pin 136 may be pushed by the elastic restoring force.

The elastic restoring force of the compression spring 120 may also allow the hit rod 450 to be pushed together. Hence, the hit rod 450 may naturally rotate about the hinge pin 475 toward the hit rod rotation allowing portion 477, and the hit pin 136 may penetrate the blocking layer 181 in a state in which the elastic restoring force is not reduced.

Some embodiments or other embodiments of the present disclosure described above are not mutually exclusive or distinct from each other. Configurations or functions of some embodiments or other embodiments of the present disclosure described above can be used together or combined with each other.

It is apparent to those skilled in the art that the present disclosure can be embodied in other specific forms without departing from the spirit and essential features of the present disclosure. Accordingly, the aforementioned detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the present disclosure should be determined by rational interpretation of the appended claims, and all modifications within an equivalent scope of the present disclosure are included in the scope of the present disclosure.

Claims

An automatic fire extinguishing system for small space comprising:

an automatic fire extinguishing device for small space installed in a switch box, the automatic fire extinguishing device for small space including a glass bulb between a hit member and a compression spring;

a hit device breaking the glass bulb; and

a bracket on which the hit device is installed while the bracket is supported in the automatic fire extinguishing device for small space,

wherein the hit device includes:

an electromagnetic valve operated by an external control such as a fire;

a hit operation rod descending as the electromagnetic valve operates;

a hit rod hitting the glass bulb; and

a connection portion connecting a lower end of the hit operation rod to an upper end of the hit rod,

wherein the connection portion includes:

an U-shaped groove portion formed at the lower end of the hit operation rod, the upper end of the hit rod being disposed in the U-shaped groove portion;

a hinge pin connecting the U-shaped groove portion to the hit rod;

a hit rod rotation allowing portion which allows the hit rod to rotate only in a direction colliding and pushing the hit rod when the compression spring is released; and

a torsion coil spring elastically pressurizing the hit rod against the U-shaped groove portion toward a non-rotation direction of the hit rod,

wherein the hit rod rotation allowing portion includes a rotation allowing chamfer portion in which an upper surface of the hit rod faces an upper surface of the U-shaped groove portion, and one surface of the rotation allowing chamfer portion is chamfered.
The automatic fire extinguishing system for small space of claim 1, wherein a position determination chamfer portion is formed on one side of an outer circumferential surface of the U-shaped groove portion and determines a position of a rotation direction of the hit rod,

wherein the bracket includes:

a first bracket plate on which one side of the electromagnetic valve is installed; and

a second bracket plate formed by bending the first bracket plate and supported in the automatic fire extinguishing device for small space,

wherein the second bracket plate faces the position determination chamfer portion.
The automatic fire extinguishing system for small space of claim 2, wherein a ㄱ-shaped groove is formed in a longitudinal direction of one side of the hit rod,

wherein the torsion coil spring is disposed in the ㄱ-shaped groove.
The automatic fire extinguishing system for small space of claim 1, wherein the automatic fire extinguishing device for small space further includes:

a fire extinguishing container containing a fire extinguishing agent;

a hit nozzle into which the fire extinguishing agent is discharged;

an elbow tube including an end connected to the fire extinguishing container and other end connected to the hit nozzle; and

a pressure gauge installed in the elbow tube,

wherein a blocking layer is installed at the other end of the elbow tube to block the fire extinguishing agent.