KR101792336B1 - A Dust Collector Having Fire Prevention Function - Google Patents

A Dust Collector Having Fire Prevention Function Download PDF

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Publication number
KR101792336B1
KR101792336B1 KR1020150110945A KR20150110945A KR101792336B1 KR 101792336 B1 KR101792336 B1 KR 101792336B1 KR 1020150110945 A KR1020150110945 A KR 1020150110945A KR 20150110945 A KR20150110945 A KR 20150110945A KR 101792336 B1 KR101792336 B1 KR 101792336B1
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KR
South Korea
Prior art keywords
sprinkler
switch
circuit
turned
main body
Prior art date
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KR1020150110945A
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Korean (ko)
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KR20170017269A (en
Inventor
김대기
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김대기
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Priority to KR1020150110945A priority Critical patent/KR101792336B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0084—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
    • B01D46/0091—Including arrangements for environmental or personal protection
    • B01D46/0093—Including arrangements for environmental or personal protection against fire or explosion
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C37/00—Control of fire-fighting equipment
    • A62C37/08—Control of fire-fighting equipment comprising an outlet device containing a sensor, or itself being the sensor, i.e. self-contained sprinklers
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C37/00—Control of fire-fighting equipment
    • A62C37/36—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device
    • A62C37/38—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone
    • A62C37/40—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone with electric connection between sensor and actuator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/42—Auxiliary equipment or operation thereof

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  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Toxicology (AREA)
  • Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)

Abstract

The present invention relates to a dust collector for fire prevention, particularly when it is confirmed that a fire ignition has occurred in a dust collector, water is automatically sprayed to turn off the fire, and if the fire is not completely turned off, Wherein the fire extinguishing dust collecting device is constructed so that the fire extinguishing operation can be continuously performed,
A main body 600 having a rectangular parallelepiped shape and having a joint portion formed therein; A suction port 200 formed at one end of the main body for sucking in air; A cartridge filter 400 installed at one end of the main body and purifying the air sucked through the suction port; A motor fan 300 installed at one end of the lower portion of the main body for delivering the sucked air to the cartridge filter and discharging the purified air; A discharge port 500 installed at one end of the main body and discharging purified air; A sprinkler 150 installed at one end of the main body for spraying water when a fire occurs in the cartridge filter 400; A sprinkler operation signal is generated by detecting smoke and flame generated in the cartridge filter, and when the sprinkler is turned off in the state where the smoke and flame are not completely removed, the sprinkler is automatically operated And a sprinkler power source automatic return circuit unit 100 for outputting a control signal for causing the power source to be turned on.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a dust collecting apparatus,

The present invention relates to a dust collector for fire prevention, and more particularly, it relates to a dust collector for fire prevention, and more particularly to a dust collector for fire prevention which is capable of automatically igniting flames by spraying water, And a fire extinguishing dust collecting device is constructed so that the fire extinguishing dust collecting device can continuously operate the fire extinguishing device.

Soot collectors for collecting soot, fume or dust and purifying the air are installed in automobile inspection centers, automobile industry companies, car centers and the like. Of course, in addition to the above-mentioned places, there is a dust collector installed in a place where smoke, fumes or dust may be generated and cause environmental pollution.

In the conventional smoke detector, the contaminated air is sucked through the suction port, and the sucked polluted air is purified from the filter and discharged to the discharge port. The filter material is broadly classified into nonwoven fabric having a heat-resistant temperature of 200 ° C or less and ceramics or metal having a heat-resistant temperature of 200 ° C or higher.

However, in the case of a nonwoven fabric cartridge, there is a drawback that a fire occurs inside the dust collector due to a low flash point. Soot and fume are very high in temperature and often generate heat inside the dust collector. Therefore, during the operation of the smoke collector, the nonwoven fabric cartridge often ignites. Therefore, even though other dust collecting functions are excellent, they are not used in places where flames are generated, and are operated with risk of fire.

Japanese Patent Laid-Open No. 97-73692 discloses a flame-retardant filter bag produced by adding a non-woven fabric layer made by mixing hot-melt-adhered oxyphene fibers or oxyphene fibers with low melting point binder fibers on one side of a filter bag. The manufacturing process is complicated, and the material cost is increased.

In order to overcome the above disadvantages, ceramic cartridges having no possibility of ignition are used in place of the nonwoven fabric cartridges. However, ceramic cartridges are less likely to ignite as compared with nonwoven cartridges, but they have drawbacks that they are very expensive.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a nonwoven fabric which senses smoke and flame generated when a nonwoven fabric is ignited by a sensor, In this state, even if the dust collector is turned on, the ignition is ignored and the flame is turned off.

As means for achieving the above object,

The present invention relates to a body 600 having a rectangular parallelepiped shape and having a joint portion formed therein; A suction port 200 formed at one end of the main body for sucking in air; A cartridge filter 400 installed at one end of the main body and purifying the air sucked through the suction port; A motor fan 300 installed at one end of the lower portion of the main body for delivering the sucked air to the cartridge filter and discharging the purified air; A discharge port 500 installed at one end of the main body and discharging purified air; A sprinkler 150 installed at one end of the main body for spraying water when a fire occurs in the cartridge filter 400; A sprinkler operation signal is generated by detecting smoke and flame generated in the cartridge filter, and when the sprinkler is turned off in the state where the smoke and flame are not completely removed, the sprinkler is automatically operated And a sprinkler power source automatic return circuit unit 100 for outputting a control signal for causing the power source to be turned on.

The sprinkler power supply automatic return circuit unit 100 includes a power supply unit 101 installed to supply a necessary voltage by connecting a plurality of dry cells or mercury cells in series, A sensor (102) for detecting flame and smoke, which is connected to the DC power source and switches a power source when a flame or smoke is sensed; An oscillation transformer (103) which is supplied with electricity when the power switch is turned on and outputs a boosted AC current; A relay operation switching unit 108 connected to an output terminal of the oscillation transformer and turned on by an electrical supply; A relay switch 107 installed at an output terminal of the switching unit for relay operation 108 and generating a magnetic force; A first circuit connection switch (sw1) for performing a function of energizing the circuit while the iron wire is pulled by the relay switch; A sprinkler power switch sw2 for supplying power to the sprinkler operation control unit when the iron wire is pulled by the relay switch to operate the sprinkler; A circuit-operating iron piece (131) which is brought into contact with the first circuit connecting switch to turn on the power source holding switch part of the flame sensing control part; A sprinkler operating iron piece 132 designed to operate in conjunction with the circuit-operating iron piece, when the circuit-operating iron piece is turned on, to turn on the sprinkler power switch to induce the sprinkler to operate; The first circuit connection switch and the base end are connected to each other, the emitter end and the collector end are connected to the oscillation transformer and the switching unit for relay operation, and the relay piece is pulled by the operation of the relay switch to form a closed circuit, And when the sprinkler power switch is turned off in an abnormal state, the first circuit connecting switch is interlocked and turned off. As a result, the closed circuit is broken while the closed circuit is broken and the relay switching unit is turned on by turning on the relay switch. And a power supply switching unit 118 for turning on the connection switch and the sprinkler power switch.

And a spring (133) installed between the first circuit connection switch and the circuit operation iron for guiding the first circuit connection switch and the circuit operation wire to be kept in an off state at all times during non-operation; The first circuit connection switch is provided at one end of the first circuit connection switch. When the first circuit connection switch is switched by pulling the wire for circuit operation at the time of operation of the relay switch, A permanent magnet (134) for maintaining the state; The operation member is connected to the circuit-operating iron piece and the sprinkler operation-use iron piece, and when the user operates the sprinkler operation to stop the operation, the circuit-operating iron piece and the sprinkler operation iron piece are turned off to stop the operation of the sprinkler operation switch, And a manual operation switch 135 for preventing the clerk from operating.

As described above, according to the present invention, the smoke and flame generated in the ignition of the nonwoven fabric are sensed by the sensor, the flush is turned off by outputting the water prepared in advance according to the sensing result, and when the flame is not completely turned off, Even if it is turned on, it is effective to continue the operation of ignoring the flame and turning off the flame.

1 is a schematic view of a dust collector of the present invention.
2 is a sectional view of the dust collector of the present invention.
3 is a circuit configuration diagram for a power automatic recovery device installed in a dust collector of the present invention.
4 is an enlarged view of the main part of Fig.

The operation principle of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings and description. It should be understood, however, that the drawings and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention, and are not to be construed as limiting the present invention.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The terms used below are defined in consideration of the functions of the present invention, which may vary depending on the user, intention or custom of the operator. Therefore, the definition should be based on the contents throughout the present invention.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. The configuration is omitted as much as possible, and a functional configuration that should be additionally provided for the present invention is mainly described.

Those skilled in the art will readily understand the functions of the components that have been used in the prior art among the functional configurations that are not shown in the following description, The relationship between the elements and the components added for the present invention will also be clearly understood.

In order to efficiently explain the essential technical features of the present invention, the following embodiments properly modify the terms so that those skilled in the art can clearly understand the present invention, It is by no means limited.

As a result, the technical idea of the present invention is determined by the claims, and the following embodiments are merely illustrative of the technical idea of the present invention in order to efficiently explain the technical idea of the present invention to a person having ordinary skill in the art to which the present invention belongs. .

1 is a schematic view of a dust collector of the present invention.

2 is a sectional view of the dust collector of the present invention.

3 is a circuit configuration diagram for a power automatic recovery device installed in a dust collector of the present invention.

FIG. 4 is an enlarged view of the main part of FIG. 3, showing a main body 600 having a rectangular parallelepiped shape and having a joint portion formed therein; A cartridge filter 400 installed at one end of the main body and sucking air, a cartridge filter 400 installed at one end of the main body and purifying air sucked through the suction port, A motor fan 300 installed to deliver the sucked air to the cartridge filter and discharging purified air, and a discharge port 500 installed at one end of the main body to discharge the purified air.

In addition, the present invention provides a sensor unit for detecting whether a flame is present in a cartridge installed around a cartridge, and a sprinkler for spraying water toward the cartridge when a flame is sensed by the sensor unit, A spark detection control unit for outputting a control signal for operation, and a sprinkler operation control unit.

The configuration of the sprinkler power supply automatic return circuit unit 100 of the present invention is as follows.

A relay switch 107, a first circuit connection switch sw1, a second circuit connection switch sw2, a first switch SW1, a second switch SW2, A sprinkler power switch sw2, and a power supply switching unit 118. The power supply switch SW2 is connected to the power supply switch SW2.

The power source unit 101 is installed to supply a necessary voltage by connecting a plurality of dry batteries or mercury batteries in series.

The flame and smoke detection sensor 102 is connected to the DC power source, and switches the power source when a flame or smoke is detected.

When the power switch is turned on, the oscillation transformer 103 is supplied with electric power and outputs a boosted AC current.

The switching unit 108 for relay operation is connected to the output terminal of the oscillation transformer and is turned on by electrical supply.

The relay switch 107 is installed at an output terminal of the relay operation switching unit 108 and generates a magnetic force.

The first circuit connection switch sw1 performs a function of energizing the circuit by pulling the iron piece by the relay switch.

The sprinkler power switch sw2 serves to guide the sprinkler operation by supplying power to the sprinkler operation control unit while the iron wire is pulled by the relay switch.

The power supply switching unit 118 is connected to the first circuit connection switch and the base stage, the emitter stage and the collector stage are connected to the oscillation transformer and the switching unit for relay operation, and the iron wire is pulled by the operation of the relay switch, When the sprinkler power switch is turned off in an abnormal state, the first circuit connecting switch is interlocked and turned off. As a result, the closed circuit is turned off and the switching unit for relay operation is turned on The relay switch is turned on so that the first circuit connecting switch and the sprinkler power switch are turned on.

In addition, when the iron piece is operated for sprinkler operation, the sprinkler operation is continued even if the power supply is not separately maintained. In addition, the sprinkler operation is stopped only when the user lifts the iron piece with the manual switch. If the manual switch is operated without the flame or smoke disappearing, the switching part for the relay operation is automatically supplied to return the iron piece so that the control signal for the sprinkler operation is continuously outputted. Respectively.

That is, the present invention further includes a circuit-operating iron piece 131, a sparkler-operating iron piece 132, a spring 133, a permanent magnet 134, and a manual operation switch 135 .

The circuit-operating iron piece 131 is brought into contact with the first circuit connecting switch to turn on the power-source holding switch portion of the flame sensing control portion.

The sprinkler-operating iron piece 132 is designed to operate in conjunction with the circuit-operating iron piece, and when the circuit-operating iron piece is turned on, the sprinkler power switch is turned on to induce the sprinkler to operate.

The elastic spring 133 is provided between the first circuit connection switch and the circuit operation wire so that the first circuit connection switch and the circuit operation wire are always kept in an off state during non-operation.

The permanent magnet (134) is installed at one end of the first circuit connection switch. When the first circuit connection switch is switched by pulling the wire for circuit operation at the time of operation of the relay switch, the circuit for operating the circuit is attached so that, The ON state of the switching unit for power supply maintenance is maintained.

The manual operation switch 135 is connected to a circuit-operating iron piece and a sprinkler-operating iron piece. When the user operates the switch for stopping the sprinkler operation, the circuit-operating iron piece and the sprinkler- The operation of the sprinkler is stopped so that the sprinkler is no longer operated.

Hereinafter, the operation of the sprinkler power automatic return circuit unit 100 will be described.

First, when the flame and smoke detection sensor 102 is turned on, a DC power source is connected to supply power to the oscillation transformer, and a high voltage is applied to the secondary side of the oscillation transformer.

The power source induced on the secondary side becomes a DC power source of a half wave through a rectifying diode, and this half wave DC power source becomes a more stable DC power source due to the charging and discharging action of the condenser.

This DC power source is applied to the anode terminal of the thyristor through the coil of the relay switch 107, while the DC power source charges the capacitor through the resistor. The raised voltage triggers the switching unit 108 for relay operation while passing through the diode, so that the node node and the cathode node are switched so that the operation of the relay switch is performed, The circuit connecting switch (sw1) and the sprinkler power switch (sw2) are turned on, the sprinkler operation control unit is powered and the sprinkler operates.

When the first circuit connection switch sw1 is activated, a power source for directing the closed circuit to the emitter end and the collector end of the power source holding switching unit 118 while the base end of the power source holding switching unit 118 is activated, Off.

That is, the voltage between the resistor 109 and the capacitor 110 is passed through the diode 120 to flow between the emitter terminal and the collector terminal of the power supply switching unit 118, and the resistance between the resistor by the bypass and the capacitor When the voltage between the resistor and the capacitor is lowered, the trigger signal to the switching unit for relay operation 108 is stopped, so that the node unit and the tail unit are turned off and the current flows to the relay switch 107 So that the power supply is continuously stopped for switching.

Of course, at this time, since the circuit-operating iron piece 131 is attached by the permanent magnet 134 to maintain the switching operation of the first circuit connecting switch sw1 and the sprinkler power switch sw2, The supply will continue to be maintained so that the operation of the sprinkler will not stop.

That is, the operation of the relay switch 107 is required only when the initial sprinkler is operated, and thereafter, when the operation of the sprinkler is started, the operation of the relay switch is no longer required.

On the other hand, if the facility manager turns off the first circuit connecting switch and the sprinkler power switch by using the manual switch 135 in a state in which the flame and the smoke are not disappeared, there is no current flow in the closed circuit, The bias voltage flowing between the negative emitter stage and the base stage disappears and the power supply holding switch 118 is turned off.

The switching part for power supply holding is turned off and the bypass voltage between the resistor and the capacitor through the diode 120 disappears, and this voltage is charged in the capacitor 110.

This charged voltage causes a brake-over phenomenon of the die 111. The die signal causes the trigger signal to be output to the switching section for operating the auxiliary switch to move the iron piece to maintain the closed circuit, So that the sprinkler 150 can be continuously operated by maintaining the sprinkler power continuously.

That is, even if the user turns off the operation of the sprinkler by operating the manual switch 135 in the state where flame or smoke is continuously detected by the flame and smoke detection sensor unit 102, So that it is not recognized that the flame is completely turned off, so that even if the operation of the sprinkler is turned off, the flame can be completely turned off since it is reactivated again.

If no flame or smoke is detected by the flame and smoke detection sensor unit 102, the operation of the sprinkler power supply automatic return circuit unit 100 is turned off. In this case, the user operates the manual switch 135 to operate the sprinkler Can be blocked manually.

200: inlet
300: Motor fan
400: Cartridge filter
500: outlet
600:

Claims (3)

A main body 600 having a rectangular parallelepiped shape and having a joint portion formed therein; A suction port 200 formed at one end of the main body for sucking in air; A cartridge filter 400 installed at one end of the main body and purifying the air sucked through the suction port; A motor fan 300 installed at one end of the lower portion of the main body for delivering the sucked air to the cartridge filter and discharging the purified air; A discharge port 500 installed at one end of the main body and discharging purified air; A sprinkler 150 installed at one end of the main body for spraying water when a fire occurs in the cartridge filter 400; A sprinkler operation signal is generated by detecting smoke and flame generated in the cartridge filter, and when the sprinkler is turned off in the state where the smoke and flame are not completely removed, the sprinkler is automatically operated Further comprising: a sprinkler power supply automatic return circuit unit (100) for outputting a control signal to control the sprinkler power supply;

The sprinkler power supply automatic return circuit unit (100)
A power supply unit 101 installed to supply a necessary voltage by connecting a plurality of batteries or mercury batteries in series; A sensor (102) for detecting flame and smoke, which is connected to the power source and switches a power source when a flame or smoke is sensed; An oscillation transformer (103) which is supplied with electricity when the power switch is turned on by the sensor for detecting flame and smoke and outputs a boosted AC current; A relay operation switching unit 108 connected to an output terminal of the oscillation transformer and turned on by an electrical supply; A relay switch 107 installed at an output terminal of the switching unit for relay operation 108 and generating a magnetic force; A first circuit connection switch (sw1) for performing a function of energizing the circuit while the iron wire is pulled by the relay switch; A sprinkler power switch sw2 for supplying power to the sprinkler operation control unit when the iron wire is pulled by the relay switch to operate the sprinkler; A circuit-operating iron piece (131) which is brought into contact with the first circuit connecting switch to turn on the power source holding switch part of the flame sensing control part; A sprinkler operating iron piece 132 designed to operate in conjunction with the circuit-operating iron piece, when the circuit-operating iron piece is turned on, to turn on the sprinkler power switch to induce the sprinkler to operate; The first circuit connection switch and the base end are connected to each other, the emitter end and the collector end are connected to the oscillation transformer and the switching unit for relay operation, and the relay piece is pulled by the operation of the relay switch to form a closed circuit, And when the sprinkler power switch is turned off in an abnormal state, the first circuit connecting switch is interlocked and turned off. As a result, the closed circuit is broken while the closed circuit is broken and the relay switching unit is turned on by turning on the relay switch. And a power supply switching unit (118) for turning on the connection switch and the sprinkler power switch;

A torsion spring (133) installed between the first circuit connection switch and the circuit operation iron piece to guide the first circuit connection switch and the circuit operation iron piece to be kept in the off state at all times during non-operation;
The first circuit connection switch is provided at one end of the first circuit connection switch. When the first circuit connection switch is switched by pulling the wire for circuit operation at the time of operation of the relay switch, A permanent magnet (134) for maintaining the state;
The operation member is connected to the circuit-operating iron piece and the sprinkler operation-use iron piece, and when the user operates the sprinkler operation to stop the operation, the circuit-operating iron piece and the sprinkler operation iron piece are turned off to stop the operation of the sprinkler operation switch, And a manual operation switch (135) for preventing the clucker from operating. delete delete
KR1020150110945A 2015-08-06 2015-08-06 A Dust Collector Having Fire Prevention Function KR101792336B1 (en)

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KR1020150110945A KR101792336B1 (en) 2015-08-06 2015-08-06 A Dust Collector Having Fire Prevention Function

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Application Number Priority Date Filing Date Title
KR1020150110945A KR101792336B1 (en) 2015-08-06 2015-08-06 A Dust Collector Having Fire Prevention Function

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KR20170017269A KR20170017269A (en) 2017-02-15
KR101792336B1 true KR101792336B1 (en) 2017-11-01

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210106137A (en) 2020-02-20 2021-08-30 주식회사 오무전기 Fire prevention and fire extinguishing device for dust collector

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023054770A1 (en) * 2021-10-01 2023-04-06 주식회사 명진기공 Spark eliminated fume smoke remover capable of preventing fire

Citations (7)

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Publication number Priority date Publication date Assignee Title
JP2000042446A (en) 1998-07-30 2000-02-15 Nippon Air Filter Kk Control circuit of electric precipitator
JP3053338B2 (en) 1994-09-14 2000-06-19 戸田建設株式会社 Method and apparatus for transporting transferred object
KR200375942Y1 (en) 2004-09-24 2005-03-11 (주)드리맥스 Clean room filter combined with sprinkler for clean room use
JP3827483B2 (en) 1999-08-26 2006-09-27 アマノ株式会社 Dust collector with fire countermeasure function
JP2008062172A (en) 2006-09-07 2008-03-21 Matsushita Electric Ind Co Ltd Electric dust collector
JP2009279571A (en) * 2008-05-21 2009-12-03 Shinyo Industries Co Ltd Fire prevention dust collector
JP2011239930A (en) 2010-05-18 2011-12-01 Hitachi Industrial Equipment Systems Co Ltd Sprinkler fire-extinguishing pump system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3053338B2 (en) 1994-09-14 2000-06-19 戸田建設株式会社 Method and apparatus for transporting transferred object
JP2000042446A (en) 1998-07-30 2000-02-15 Nippon Air Filter Kk Control circuit of electric precipitator
JP3827483B2 (en) 1999-08-26 2006-09-27 アマノ株式会社 Dust collector with fire countermeasure function
KR200375942Y1 (en) 2004-09-24 2005-03-11 (주)드리맥스 Clean room filter combined with sprinkler for clean room use
JP2008062172A (en) 2006-09-07 2008-03-21 Matsushita Electric Ind Co Ltd Electric dust collector
JP2009279571A (en) * 2008-05-21 2009-12-03 Shinyo Industries Co Ltd Fire prevention dust collector
JP2011239930A (en) 2010-05-18 2011-12-01 Hitachi Industrial Equipment Systems Co Ltd Sprinkler fire-extinguishing pump system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210106137A (en) 2020-02-20 2021-08-30 주식회사 오무전기 Fire prevention and fire extinguishing device for dust collector

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