KR102423971B1 - smoke control system for fire fighting - Google Patents

Abstract

The present invention relates to a firefighting smoke control device during a fire, which can prevent an accident of loss of lives due to smoke, comprising: a door fixture in which a support groove is formed; a fixed case on which a support leg is mounted; an air curtain for discharging air into a moving passage; a water injection means including a water supply unit; and a smoke suction means including a suction driving unit.

Description

Smoke control system for fire fighting

The present invention relates to a smoke control device for fire fighting, and more particularly, to a smoke control device for fire fighting that can block a passage between a fire area and a bathroom from being sucked into a bathroom when a fire occurs.

In the event of a fire in a building, toxic gas is generated along with the spread of the fire, causing damage to property as well as many lives. In particular, in the case of toxic gas, it is the first cause of human casualties, and in order to reduce human casualties, it is very important to prevent the spread of such toxic gases.

The specific gravity of toxic gas is lighter than air and floats in the air. In public buildings, etc. being built recently, a gas diffusion barrier is installed to block the spread of toxic gas by using the above properties. In addition, a firewall or the like may be installed to prevent further damage as the flame spreads to adjacent areas.

However, in the case of a gas diffusion barrier, it is installed to protrude only a certain length downward from the ceiling for quick evacuation of residents. There was a problem that the quick evacuation of residents who could not evacuate was prevented due to the weak installation of emergency exits for the purpose of evacuation.

And in the case of an apartment building, since it is a building used for residential purposes, it is difficult to install facilities such as a gas diffusion barrier inside the building. Republic of Korea Patent Registration No. 10-1503407 (announced date: Mar. 17, 2015), "fire blocking device for evacuation of residents of apartment buildings" is disclosed.

However, this prior art has an advantage in that it secures an independent space in the fire area to ensure the safety of the occupants. There was a problem in that it was difficult to secure the safety of the evacuated occupants because soot (toxic gas) was introduced through the joint of the rolled fire barrier plate.

Republic of Korea Patent Publication No. 10-1596913 Republic of Korea Patent Publication No. 10-1503407

The present invention has been proposed in view of the above circumstances, and by mounting a fixed case provided with an air curtain, a water spraying means, and a smoke suction means between the bathroom and the inside, it is possible to block the passage between the fire zone and the bathroom in case of a fire. An object of the present invention is to provide a smoke control system for firefighting in the event of a fire.

Another object of the present invention is to provide a smoke control device for fire fighting that can block smoke generated in case of a fire through an air curtain, water spray means, smoke suction means, etc. mounted on the fixed case.

In the case of fire according to an embodiment of the present invention, a fire extinguishing device for fire fighting includes a passage formed on a wall dividing a bathroom and an interior and an open door mounted on the passage and opening or blocking the passage through a sliding operation, the entrance of the bathroom opening door a door fixture mounted along the periphery, a moving passage is formed therein, and a support groove is formed around the moving passage; After a part is inserted into the support groove of the door fixture, it is fixed through a fastener, a movement passage is formed inside, a suction mounting space is formed in a vertical direction on one side, and an upper mounting space and the upper mounting space are formed at the upper part. An upper mounting part is formed in which a partition protrusion for dividing the front, center and rear mounting spaces, an upper cover for opening or blocking the upper mounting space, and an upper partition wall having a plurality of communication holes communicating the moving passage and the upper mounting space are formed. and a fixing case having a leg support groove formed at an interval on the bottom surface, one end fixed to the ground and the other end mounted with a support leg inserted into the leg support groove; an air curtain disposed in a front mounting space of the upper mounting unit constituting the fixed case and discharging air to the communication path through a communication hole formed in the upper partition wall; A water spray pipe mounted in the central mounting space of the upper mounting part and spraying water into the moving passage through a communication hole formed in the upper partition wall, a spray nozzle mounted at intervals in the water spray pipe, the Water spray means comprising a water connection pipe for supplying water to the water spray pipe, a water supply part mounted in the middle of the water connection pipe and supplying or blocking water to the water spray pipe; A vertical suction pipe and a horizontal suction pipe respectively disposed in the suction mounting space and the rear mounting space of the fixed case, the suction pipe mounted at intervals between the vertical suction pipe and the horizontal suction pipe, the vertical suction pipe and the horizontal suction pipe connection part A pipe connector mounted on the, one end is coupled to the pipe connector and the other end is coupled to an external pipe that communicates with the outside. It includes a; smoke suction means composed of a suction driving unit that is transmitted to the external pipe.

The smoke control device for fire fighting according to the present invention is equipped with a fixed case provided with an air curtain, a water spray means, and a smoke suction means between the bathroom and the inside, so that in case of a fire, it is possible to block the passage between the fire zone and the bathroom as well as to block the fire. It has the effect of preventing human accidents due to the smoke generated when it occurs.

In addition, the smoke control device for firefighting according to the present invention has an effect of blocking multiple smoke generated during a fire through an air curtain, a water spraying means, a smoke suction means, etc. mounted on the fixed case.

1 is a perspective view showing an embodiment of a smoke control device for fire fighting in case of a fire according to the present invention.
2 is an exploded perspective view showing the configuration of a smoke control device for fire fighting in accordance with the present invention.
Figure 3 is a side cross-sectional view showing a smoke control device for fire fighting in accordance with the present invention.
4 is a block diagram showing the fire extinguishing means constituting the smoke control system for fire fighting in accordance with the present invention.
5 is a block diagram showing a smoke exhaust means constituting the smoke control system for fire fighting in accordance with the present invention.
6 to 8 are views showing another embodiment of the smoke control device for fire fighting in the event of a fire according to the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is defined by the description of the claims. Meanwhile, the terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural, unless specifically stated otherwise in the phrase. As used herein, “comprises” or “comprising” refers to the presence or absence of one or more other components, steps, operations and/or elements other than the stated elements, steps, acts and/or elements. addition is not excluded.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings, in which Fig. 1 is a perspective view showing an embodiment of a fire extinguishing apparatus for fire fighting according to the present invention, and Fig. 2 is a fire extinguishing ventilation system according to the present invention. It is an exploded perspective view showing the configuration of the device, FIG. 3 is a side cross-sectional view showing the smoke control device for fire fighting according to the present invention, and FIG. 4 is a configuration diagram showing fire extinguishing means constituting the smoke control device for fire fighting according to the present invention, 5 is a block diagram showing a smoke exhaust means constituting a smoke control device for fire fighting in case of a fire according to the present invention.

The smoke control device 10 for fire fighting according to the present invention is mounted on the passage S formed on the wall B that divides the bathroom and the interior and is mounted on the passage S and opens or blocks the passage S through a sliding operation. It is mounted on the open door (1).

That is, the smoke control device 10 for fire fighting is mounted along the periphery of the entrance of the bathroom open door, and blocks the fire from being transmitted to the inside of the bathroom together with the open door 1 in case of fire.

And the fire extinguishing device 10 for firefighting includes a door fastener 20 , a fixing case 30 , an air curtain 40 , a water spraying means 50 , and a smoke suction means 60 .

Here, the operation of the smoke control device 10 for firefighting in the event of a fire operates when an external signal is received according to the detection of a fire or when a known fire detection sensor installed in the house is operated, and the detection of the external signal and the fire detection sensor are and purpose, and a separate description thereof will be omitted.

The door fixture 20 is mounted along the perimeter of the entrance of the bathroom opening door.

And the door fastener 20 is formed in a hollow rectangular shape, a moving passage 21 is formed therein, and a support groove 22 is formed around the moving passage 21 .

That is, after the door fastener 20 is formed in a rectangular frame shape, it is arranged around the entrance of the bathroom opening, and then is fixed through a known mortar, bracket, fastener, or the like.

The fixing case 30 is coupled to the door fastener 20 .

That is, the fixing case 30 is disposed in the bathroom and is coupled to the door fastener 20 and accommodates the air curtain 40 , the water spraying means 50 , and the smoke suction means 60 .

And the fixing case 30 is fixed through a fastener after a part is inserted into the support groove 22 of the door fastener 20, a moving passage 31 is formed therein, and one side is sucked in the vertical direction. The mounting space 32 is formed, the upper mounting part 33 is formed on the upper part, the leg support grooves 34 are formed at intervals on the bottom surface, one end is fixed to the ground and the other end is in the leg support groove 34 . A support leg 35 to be inserted is mounted.

That is, the fixed case 30 is provided with a suction mounting space 32 in which the smoke suction means 50 is mounted on one side while the moving passage 31 is formed therein, and the air curtain 40 and water spraying on the upper part. The upper mounting part 33 to which the means 50 and the smoke suction means 60 are mounted is formed, and the leg support groove 34 and the support leg 35 for supporting the fixed case 30 are mounted at the lower part.

Here, the upper mounting portion 33 has an upper mounting space 33a formed therein, and a partition protrusion 33b for dividing the upper mounting space 33a into front, center and rear mounting spaces (as, bs, cs). ), an upper cover 33c for opening or blocking the upper mounting space 33a, and an upper partition wall 33d having a plurality of communication holes 33e for communicating the moving passage 31 and the upper mounting space 33a. ) is composed of

That is, the upper mounting part 33 divides the upper mounting space 33a through the partitioning protrusion 33b and then mounts the air curtain 40 in the front mounting space as, and water in the central mounting space bs. The injection means 50 is mounted, and the smoke suction means 60 is mounted in the rear mounting space cs.

In addition, the communication hole 33e formed in the upper partition wall 33d is formed in the partition wall 33d corresponding to the front, center, and rear mounting spaces as, bs, and cs, respectively.

In addition, a control unit C is mounted on the upper cover 33c so that an evacuee can directly operate the smoke control device 10 for firefighting when the fire is not in operation, and the control unit C operates the air curtain through a known controller (40), the water spraying means 50, the smoke suction means (60) to control the separate description will be omitted.

The air curtain 40 is mounted on the fixed case 30 .

That is, the air curtain 40 is mounted on the upper mounting part 33 constituting the fixed case 30 .

Specifically, the air curtain 40 is mounted in the front mounting space (as) of the upper mounting space (33a) constituting the upper mounting part (33), the communication hole (33e) formed in the upper partition wall (33d) By supplying the internal air of the air curtain 40 of the moving passage 31 through the air to block the internal air and the bathroom through the air.

Here, the air curtain 40 is configured by selecting a known air curtain according to the environment and purpose, and a separate description will be omitted.

The water spraying means 50 is mounted on the fixed case 30 .

That is, the water spraying means 50 is mounted on the upper mounting part 33 constituting the fixed case 30 .

Specifically, the water spraying means 50 is mounted in the central mounting space (bs) of the upper mounting space (33a) constituting the upper mounting (33).

And the water spraying means 50 is a water spraying pipe 51 for spraying water into the inside of the moving passage 31 through the communication hole 33e formed in the upper partition wall 33d, the water spraying pipe A spray nozzle 52 mounted at intervals to 51, a water connection pipe 53 for supplying water to the water jet pipe 51, and a water jet pipe installed in the middle of the water connection pipe 53 It is composed of a water supply unit 54 for supplying or blocking the 51 .

That is, in the water spraying means 50 , when a fire signal is received, the water supply unit 54 operates to supply external water to the water spraying pipe 51 , and the water spraying pipe 51 is connected to the spray nozzle 52 . Water is sprayed from the upper part of the moving passage 31 to the lower direction through the .

At this time, the water supply unit 54 is composed of a pump 54a for supplying external water (such as water accommodated in a water storage tank or an external water supply pipe) and a valve 54b mounted on the water connection pipe 53 , , when the pump 54a is operated, external water is supplied to the water injection pipe 51 through the opening of the valve 54b.

The smoke suction means 60 is mounted on the fixed case 30 and the wall (B).

That is, the smoke suction means 60 is mounted on the suction mounting space 32 and the upper mounting part 33 constituting the fixed case 30 .

Specifically, the air curtain 40 is mounted in the rear mounting space cs of the suction mounting space 32 and the upper mounting space 33a constituting the upper mounting part 33 .

In a more supplementary explanation, the smoke suction means 60 sucks the smoke moving to the bathroom through the moving passage 31 of the fixed case 30 through the upper part and the side of the fixed case 30 and discharges it to the outside. that made it possible

In addition, the smoke suction means 60 includes a vertical suction pipe 61 and a horizontal suction pipe 63 that are respectively disposed in the suction mounting space 32 and the rear mounting space cs of the fixed case 30, and the vertical suction Inhalers (62, 64) mounted at intervals between the pipe (61) and the horizontal suction pipe (63), the pipe connector (65) mounted on the connection portion of the vertical suction pipe (61) and the horizontal suction pipe (63), A suction connection pipe 66 having one end coupled to the pipe connector 65 and the other end coupled to an external pipe P communicating with the outside, is mounted in the middle of the suction connection pipe 66 and the vertical and horizontal suction pipes It is composed of a smoke suction means (60) composed of a suction driving unit (67) for transferring the smoke sucked through the (61, 63) to the external pipe (P).

That is, the smoke suction means 60 operates the suction driving unit 67 when a fire signal is received, and the inhalers 62 and 64 mounted on the vertical suction pipe 61 and the horizontal suction pipe 63 move through the passage ( 31), the smoke sucked into the vertical suction pipe 61 and the horizontal suction pipe 63 is transferred to the external pipe P through the pipe connector 65 and the suction connection pipe 66 will do

At this time, the suction driving unit 67 is a drive pump 67a that sucks smoke through the vertical suction pipe 61 and the horizontal suction pipe 63 and the suction connection pipe 66 to prevent the smoke from flowing backward. Consists of a one-way valve (67b), the air sucked through the vertical suction pipe (61) and the horizontal suction pipe (63) is delivered to the external pipe (P).

Next, the smoke control device 10 for fire fighting according to the present invention may be configured as shown in FIGS. 6 to 8 .

First, in the case of a fire in the case of a fire in FIG. 6, the smoke control device 10 for firefighting shown in FIG. 6 is equipped with a bottom plate 70 on the lower bottom surface 36 of the fixed case 30 to prevent water from being delivered to the inside in case of a fire, It is designed to be used as acupressure on the soles of the feet in normal times.

To this end, a bottom plate support groove 37 is formed at an interval on the lower bottom surface 36 of the fixed case 30 , and the upper surface 71 is formed in an inclined manner on the upper portion of the lower bottom surface 36 . A bottom plate 70 having a support projection 73 coupled to the bottom plate support groove 37 is detachably mounted at a lower portion of the bottom plate 70 with an anti-slip protrusion 72 therebetween.

Next, the fire extinguishing device 10 for fire fighting of FIG. 7 can open or block the moving passage 31 of the fixed case 30 between the central mounting space bs and the rear mounting space cs. It shows an example in which the internal blocking means 80 is mounted so that it is possible.

That is, in the case of the fire, the smoke control device 10 for firefighting is configured to block the moving passage 31 of the fixed case 30 through the internal blocking means 80 .

In addition, the internal blocking means 80 is disposed in the upper mounting space 33a of the upper mounting part 33, and a non-combustible case 81 in which a non-combustible curtain 82 formed of a non-combustible material is wound, the non-combustible cut ( It consists of an operation handle 83 mounted on the lower part of the 82 and mounted with a magnet 84 at the end thereof, and a metal plate 84 mounted on the lower bottom surface 36 positioned on the same line of the non-combustible case 81 . .

That is, the internal blocking means 80 is configured such as a blind installed on the window side to block or open the moving passage 31 of the fixed case 30 .

Next, the fire extinguishing device 10 for fire fighting of FIG. 8 shows an example in which a detachable door 90 for blocking or opening the moving passage 31 is mounted at the end of the fixed case 30 .

And the detachable door 90 is composed of a metal plate 91 mounted in a vertical direction on both sides of the fixed case 30, a plurality of folding members, folded when operating in one direction, and unfolded when operating in the other direction. The door 92 is mounted on the last folding member constituting the door 92 and is composed of a magnet 93 coupled to or separated from the metal plate 91 .

That is, the moving passage 31 of the fixed case 30 can be opened or separated through the detachable door 90 .

An embodiment of the smoke control device for fire fighting in case of a fire configured as described above is as follows.

First, after forming the passage (S) formed on the wall (B) dividing the bathroom and the interior, the opening door (1) mounted on the passage (S) to open or block the passage (S) through a sliding operation install

And the door fixture 20 is formed in a hollow rectangular shape along the periphery of the entrance of the bathroom open door, a moving passage 21 is formed therein, and a support groove 22 is formed around the moving passage 21. ) is installed.

Next, after a part is inserted into the support groove 22 as the door fastener 20, it is fixed through a fastener, a moving passage 31 is formed inside, and a suction mounting space 32 in the vertical direction on one side. is formed, and the upper mounting space (33a) and the upper mounting space (33a) are divided into front, center and rear mounting spaces (as, bs, cs) with a partition protrusion (33b) and the upper mounting space ( The upper mounting part ( 33) is formed, the leg support grooves 34 are formed at intervals on the bottom surface, one end fixed to the ground and the other end fixed case 30 in which the support legs 35 inserted into the leg support grooves 34 are mounted. ) is installed.

And after separating the upper cover (33c) constituting the fixed case (30) to the front mounting space (as) of the upper mounting portion (33) through the communication hole (33e) formed in the upper partition wall (33d) An air curtain 40 for discharging air to form a barrier film is mounted in the passage 31 .

Next, a water spray pipe for spraying water into the inside of the moving passage 31 through the communication hole 33e formed in the upper partition wall 33d into the central mounting space bs of the upper mounting portion 33 . (51), a spray nozzle 52 mounted at intervals to the water spray pipe 51, a water connection pipe 53 for supplying water to the water spray pipe 51, and the water connection pipe 53 The water spray means 50 is mounted on the way and is composed of a water supply part 54 for supplying or blocking water to the spray pipe 51 is mounted.

And the vertical suction pipe 61 and the horizontal suction pipe 63 respectively disposed in the suction mounting space 32 and the rear mounting space cs of the fixed case 30 constituting the fixed case 30, the vertical Suction pipe (61) and the horizontal suction pipe (63) installed at a distance from the suction pipe (62, 64), the vertical suction pipe (61) and the pipe connector (65) mounted on the horizontal suction pipe (63) , a suction connection pipe 66 having one end coupled to the pipe connector 65 and the other end coupled to an external pipe P communicating with the outside, mounted in the middle of the suction connection pipe 66 and the vertical and horizontal suction When the smoke suction means 60 composed of a suction driving unit 67 for delivering smoke sucked through the pipes 61 and 63 to the external pipe P is mounted and the upper cover 33c is coupled, in case of a fire The installation work of the fire extinguishing device 10 is completed.

Here, it is revealed that the order of assembling the smoke control device for firefighting in case of fire may be different from the above.

In such a state, the fire extinguishing device 10 for fire fighting is usually disposed between the interior and the bathroom, and serves as a passage through which the user travels between the interior and the bathroom.

And when a fire occurs, the fire extinguishing device 10 receives an external signal and receives the air curtain 40, the water spraying means 50, and the smoke suction means 60 mounted on the fixed case 30. will make it work

That is, in the case of a fire, the smoke control device 10 for firefighting primarily blocks the smoke transmitted from the inside to the bathroom through the moving passages 21 and 31 through the air curtain 40, and through the water spraying means 50 Secondary blocking, and finally blocking through the smoke suction means (60).

As described above, the smoke control device for fire fighting according to the present invention can block the transmission of flames to the bathroom in addition to smoke through the air curtain, water spray means, and smoke suction means.

The above description is merely illustrative of the technical idea of the present invention, and various modifications and variations are possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains.

Accordingly, the embodiments expressed in the present invention are not intended to limit the technical spirit of the present invention, but to illustrate, and the scope of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas equivalent to or within the equivalent range should be construed as being included in the scope of the present invention.

1: open door
10: Smoke control system for firefighting in case of fire
20: door fixture 21: moving passage
22: support groove
30: fixed case 31: moving passage
32: suction mounting space 33: upper mounting part
33a: upper mounting space 33b: partition projection
33c: upper cover 33d: upper partition wall
33e: through hole 34: leg support groove
35: support leg
40 : air curtain
50: water injection means 51: water injection pipe
52: injection nozzle 53: water connection pipe
54: water supply
60: smoke suction means 61: vertical suction pipe
62: suction 63: horizontal suction pipe
64: inhaler 65: pipe connector
66: suction connection pipe 67: suction drive unit
70: bottom plate 71: upper surface
72: non-slip projection 73: support projection
80: internal blocking means 81: non-combustible case
82: non-combustible curtain 83: operation handle
84: metal plate
90: detachable door 91: metal plate
92: door 93: magnet

Claims (4)

In the passage (S) formed on the wall (B) dividing the bathroom and the interior and the opening door (1) mounted on the passage (S) to open or block the passage (S) through a sliding operation,
It is mounted along the periphery of the entrance of the bathroom open door, the movement passage 21 is formed inside, the door fixture 20 in which the support groove 22 is formed around the movement passage 21;
After a part is inserted into the support groove 22 of the door fixture 20, it is fixed through the fastener, a moving passage 31 is formed inside, and a suction mounting space 32 is formed in a vertical direction on one side. , the upper mounting space (33a) and the upper mounting space (33a) in the front, center, rear mounting space (as, bs, cs) for dividing the partition projection (33b) and the upper mounting space (33a) An upper mounting part 33 in which an upper partition wall 33d having a plurality of communication holes 33e communicating between the opening or blocking upper cover 33c and the moving passage 31 and the upper mounting space 33a is formed is formed. a fixed case 30 in which a support leg 35 is formed, the bottom surface has a leg support groove 34 formed at an interval, one end is fixed to the ground and the other end is inserted into the leg support groove 34;
It is disposed in the front mounting space (as) of the upper mounting part (33) constituting the fixed case (30) and discharges air to the communication passage (31) through the communication hole (33e) formed in the upper partition wall (33d) air curtain (40);
A water spray pipe disposed in the central mounting space bs of the upper mounting part 33 and injecting water into the moving passage 31 through the communication hole 33e formed in the upper partition wall 33d. (51), a spray nozzle 52 mounted at intervals to the water spray pipe 51, a water connection pipe 53 for supplying water to the water spray pipe 51, and the water connection pipe 53 Water spray means 50 mounted on the way and composed of a water supply unit 54 for supplying or blocking water to the water spray pipe 51;
A vertical suction pipe 61 and a horizontal suction pipe 63 respectively disposed in the suction mounting space 32 and the rear mounting space cs of the fixed case 30, the vertical suction pipe 61 and the horizontal suction pipe ( Inhalers 62 and 64 mounted at intervals to 63), a pipe connector 65 mounted on a connection part of the vertical suction pipe 61 and the horizontal suction pipe 63, and one end of the pipe connector 65 A suction connection pipe 66 coupled to an external pipe P that is coupled and the other end communicates with the outside, is mounted in the middle of the suction connection pipe 66 and is sucked through the vertical and horizontal suction pipes 61 and 63 A smoke control device for fire fighting including a; smoke suction means (60) comprising a suction driving unit (67) for delivering smoke to an external pipe (P).
The method according to claim 1,
A bottom plate support groove 37 is formed at intervals on the lower bottom surface 36 of the fixed case 30,
An anti-skid protrusion 72 is formed on the upper surface of the lower bottom surface 36 while the upper surface 71 is inclined at intervals, and a support protrusion 73 coupled to the bottom plate support groove 37 is provided at the lower portion. A smoke control device for firefighting, characterized in that the formed bottom plate 70 is detachably mounted.
The method according to claim 1,
An internal blocking means 80 is mounted to open or block the movement passage 31 of the fixed case 30 between the central mounting space bs and the rear mounting space cs,
The internal blocking means 80,
a non-combustible case 81 disposed in the upper mounting space 33a of the upper mounting part 33 and having a non-combustible curtain 82 formed of a non-combustible material wound therein;
an operation handle 83 mounted on a lower portion of the non-combustible curtain 82 and having a magnet 84 mounted at an end thereof; and
and a metal plate (84) mounted on the lower bottom surface (36) positioned on the same line of the non-combustible case (81).
4. The method according to any one of claims 1 to 3,
A detachable door 90 for blocking or opening the moving passage 31 is mounted at the end of the fixed case 30,
The detachable door 90 is,
a metal plate 91 mounted in a vertical direction on both sides of the fixed case 30;
Consisting of a plurality of folding members, the door is folded when operating in one direction, and unfolds when operating in the other direction (92); and
and a magnet (93) mounted on the last folding member constituting the door (92) and coupled or separated from the metal plate (91).

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