JP2022031887A - Smoke detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable smoke detection device configured to detect smoke particles contained in the air sucked in through a suction nozzle.

SOLUTION: A smoke detection device provided herein comprises a suction nozzle 10 with an air suction port, and a detection unit configured to detect smoke density based on smoke particles contained in the air sucked in through the suction nozzle 10. The suction nozzle 10 is extendable.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a portable smoke detection device that detects smoke particles contained in air sucked from a suction nozzle.

A high-sensitivity smoke detection device capable of detecting minute smoke is installed in a computer room in which a server or the like is installed or a clean room in a semiconductor manufacturing facility or the like. The high-sensitivity smoke detector sucks air from a sampling tube installed in the monitoring area, and optically detects particles floating in the sucked air using laser light, and the number of particles exceeds a predetermined number. If so, output an alarm.

In addition to such a fixed smoke detection device, a portable smoke detection device is also known. The portable smoke detection device is brought into a monitoring area and used, and has a suction nozzle for sucking air and a main body for detecting the smoke concentration in the air sucked from the suction nozzle. The operator grips the main body of the portable smoke detection device, or fixes it to the body with a shoulder strap or the like, and moves by holding the suction nozzle by hand. Then, by pointing the suction nozzles at various points, it is possible to identify the points where smoke is generated. Examples of such a smoke detection device include those listed in Patent Document 1.

Japanese Patent Application No. 2014-182803

Since the portable smoke detector is divided into a main body and a suction nozzle, it is necessary to hold the main body with one hand or fix it to the body, and in that state, suck with the other hand. The nozzle will be aimed at the detection target. The main body and the suction nozzle are connected by a flexible hose member or the like, but in this form, it is not always easy to handle the suction nozzle. In addition, it is difficult to operate the main body while pointing the suction nozzle at the detection target.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a smoke detection device having various functions.

In order to solve the above problems, the smoke detection device according to the first aspect of the present invention includes a suction nozzle having an air suction port and a suction nozzle.
It has a detection unit that detects the smoke concentration based on the smoke particles contained in the air sucked through the suction nozzle.
The suction nozzle is characterized in that it can be expanded and contracted.

Further, in the smoke detection device according to the second aspect of the present invention, the suction nozzle is formed by slidably inserting the second pipe member into the hollow first pipe member.
A protruding portion protruding in the radial direction is provided on the outer periphery of one end of the second pipe member.
When the second pipe member is slid with respect to the first pipe member so that the length of the suction nozzle is maximized, the protruding portion of the second pipe member becomes the said portion of the first pipe member. It is characterized in that it comes into contact with the inner surface on the outer peripheral side of the opening provided at the end portion on the center side of the suction nozzle.

According to the smoke detection device according to the present invention, the length of the suction nozzle can be shortened in the portable smoke detection device, and the storability can be improved.

It is a top view of the smoke detection device in this embodiment. It is a front view of the smoke detection device. It is an enlarged view of the alarm display part. It is a top view of the smoke detection device in the state that the handle part is grasped by hand. It is a block diagram which showed the structure of a smoke detection device. It is sectional drawing of the suction nozzle which was made expandable. It is a front view when the position of the center of gravity of a housing is adjusted.

Embodiments of the present invention will be described in detail with reference to the drawings. The smoke detection device of the present embodiment is portable and is used by an operator to move in the monitoring area by hand and identify the location where smoke is generated. FIG. 1 shows a plan view of the smoke detection device according to the present embodiment, and FIG. 2 shows a front view of the smoke detection device. As shown in each of these figures, the smoke detection device of the present embodiment has a housing 1 that can be held by hand.

The housing 1 is formed so as to form a substantially rectangular parallelepiped box shape. A suction nozzle 10 is provided so as to extend in one direction from one surface of the housing 1. The suction nozzle 10 has a hollow pipe portion 11 directly connected to the housing 1, and the tip thereof is an open suction port 12. The suction port 12 communicates with the inside of the housing 1, and the air sucked from the suction port 12 can be taken into the housing 1. Further, inside the pipe portion 11, an airflow sensor 13 capable of measuring the flow velocity of the sucked air is provided.

A handle portion 15, a smoke concentration display portion 16, a power supply switch 25, and a wind speed changeover switch 22a are provided on a surface of the housing 1 orthogonal to the surface on which the suction nozzle 10 is provided. The handle portion 15 is formed in a handle shape that can be grasped by an operator by hand. Further, the smoke concentration display unit 16 is a bar graph-shaped display unit, and can display the detected smoke concentration in real time. The smoke concentration display unit 16 is not limited to the bar graph shape, and may have another form such as one that displays the smoke concentration numerically or one that displays it with an indicator. Further, the smoke concentration display unit 16 may be provided with a switch for switching the range of the smoke concentration to be displayed, or a volume switch for continuously changing the range. The power switch 25 can perform an on / off operation of the power supply in the smoke detection device. The wind speed changeover switch 22a can switch the flow velocity of the air sucked by the suction nozzle 10.

A reset switch 26, an alarm display unit 27, and a fan switch 28, which is an operation unit, are provided on the surface of the housing 1 where the suction nozzle 10 is provided and the surface where the handle portion 15 and the smoke concentration display unit 16 are provided. Will be. The reset switch 26 is operated to return to the normal state when an error occurs in the smoke detection device. Further, the fan switch 28 can turn on and off the suction fan provided in the housing 1. By turning on the suction fan in the housing 1 when detecting smoke and turning off the suction fan when the operator moves, the suction fan can be operated only when necessary. As a result, battery consumption can be suppressed.

FIG. 3 shows an enlarged view of the alarm display unit 27. The alarm display unit 27 has a caution light, a warning light, and an alarm light in response to the increase in the detected smoke concentration. It also has a power light that indicates power supply, a failure representative light that indicates the occurrence of a failure, and a suction check light that indicates that the suction system is clogged.

FIG. 4 shows a plan view of the smoke detection device in a state where the handle portion 15 is gripped by hand. As shown in this figure, the housing 1 can be held by the operator holding the handle portion 15 with one hand. Since the handle portion 15 and the suction nozzle 10 are integrally provided on the housing 1, the operator grips the handle portion 15 by hand and changes the direction of the handle portion to change the direction of the handle portion 15 to cause the suction nozzle 10. You can also change the direction in which you are facing.

FIG. 5 shows a block diagram showing the configuration of the smoke detection device. As shown in this figure, the housing 1 includes a control unit 20 that controls a smoke detection device, a smoke detection unit 21 that detects smoke concentration, a suction unit 22 that sucks air, and a smoke detection device. It has a power supply unit 23 for supplying power. The operation of the smoke detection unit 21 and the suction unit 22 is controlled by the control unit 20. The power supply unit 23 is composed of a rechargeable battery.

Further, the smoke concentration display unit 16, the power switch 25, and the reset switch 26 are connected to the control unit 20. When the power switch 25 is operated from off to on, power is supplied from the power supply unit 23 to each unit, and the control unit 20, the smoke detection unit 21, the suction unit 22, and the like are put into an operating state.

Further, the control unit 20 is connected to an acoustic output unit 29 including the above-mentioned alarm display unit 27, a fan switch 28, a wind speed changeover switch 22a, an air flow sensor 13, and a speaker capable of acoustic output. A voice signal is output from the control unit 20 according to a state such as normality, caution, caution, alarm, or failure, and the sound output unit 29 sounds a buzzer or outputs a voice based on the voice signal. The wind speed changeover switch 22a can switch the suction strength by the suction unit 22 via the control unit 20. Thereby, the flow velocity of the air sucked from the suction port 12 can be changed.

Along with the switching of the wind speed changeover switch 22a, the smoke concentration range displayed by the smoke concentration display unit 16 described above may be automatically switched by the control unit 20. For example, when the wind speed changeover switch 22a is operated to increase the flow velocity of the air sucked from the suction port 12, smoke can be detected with higher sensitivity. Therefore, the smoke concentration display unit 16 Change to a finer numerical range. On the contrary, when the flow velocity of the air sucked from the suction port 12 is reduced, the smoke concentration display unit 16 is changed to a large numerical range. As a result, the range of the smoke concentration display unit 16 can be automatically set to be appropriate.

The smoke detection unit 21 takes in the air sucked through the suction nozzle 10 into the suction pipe, forms a laser beam on the air flow flowing through the suction pipe, and forms a smoke detection point of about 1 micrometer. The scattered light generated when smoke particles pass through this smoke detection point is received by a photodiode arranged parallel to the direction of the electric field component E of the laser light, a detection pulse is output and counted, and this count is used. It is possible to detect a minute smoke concentration. Information on the smoke concentration detected by the smoke detection unit 21 is sent to the control unit 20, and the control unit 20 can make the smoke concentration display unit 16 display a display according to the smoke concentration detected by the smoke detection unit 21.

The suction unit 22 has a suction fan inside, whereby air can be sucked from the suction port 12 of the suction nozzle 10. The air sucked from the suction nozzle 10 is taken into the smoke detection unit 21 as described above. Further, although not shown, a discharge port is formed on the bottom surface of the housing 1, and air is discharged from this discharge port.

The airflow sensor 13 provided in the pipe portion 11 of the suction nozzle 10 measures the flow velocity of the air in the pipe portion 11 when the air is sucked by the suction unit 22, and transmits the information to the control unit 20. .. As a result, the control unit 20 can grasp that the switching state by the wind speed changeover switch 22a and that the air is not sucked. If it is detected that the air flow velocity has not changed or that the air has not been sucked even though the wind speed changeover switch 22a has been operated, the control unit 20 causes a failure in the alarm display unit 27. At the same time as displaying, the sound of the failure occurrence is generated from the sound output unit 29.

Further, the control unit 20 can control the suction fan and adjust the range of the smoke concentration display unit 16 based on the air flow rate detected by the air flow sensor 13. The suction fan is controlled and the range of the smoke concentration display unit 16 is adjusted as follows. First, the suction fan is controlled so that the flow velocity of the air detected by the airflow sensor 13 becomes high. At this time, since the suction amount is large, it is in a high-sensitivity state where detection is possible even if the amount of smoke is small. Further, in this state, by setting the smoke concentration display unit 16 to a fine numerical range, even a small amount of smoke can be appropriately displayed on the smoke concentration display unit 16.

In the high-sensitivity state, the amount of air sucked is large and the air flow around the suction nozzle 10 is disturbed, so that it may be difficult to accurately identify the smoke generation location. Therefore, when smoke is detected in the high-sensitivity state, the control unit 20 controls the suction fan so that the flow velocity of the air detected by the airflow sensor 13 becomes small, and sets the suction fan in the low-sensitivity state. In this state, by setting the smoke concentration display unit 16 to a large numerical range, the smoke generation location can be accurately specified by the smoke concentration display unit 16.

Although the airflow sensor 13 is provided inside the pipe portion 11 in the present embodiment, the airflow sensor 13 is not limited to this, and may be provided in the air flow path in the housing 1. For example, the airflow sensor 13 can be arranged immediately before the smoke detection unit 21.

The power supply unit 23 is connected to the power supply circuit unit 24. The power supply circuit unit 24 can be connected to an AC plug that can be connected to an AC outlet, and by inputting an AC 100 volt, it can be converted into a predetermined DC voltage and output to the power supply unit 23. As a result, electric power is input to the power supply unit 23 from the power supply circuit unit 24 to charge the power supply unit 23.

Next, a method of using the smoke detection device of the present embodiment will be described. A fixed smoke detection device is installed in the monitoring area, and when a smoke concentration above a predetermined level is detected by this smoke detection device, the operator holds the smoke detection device of the present embodiment and holds the monitoring area. Work to identify the location of smoke generation. At this time, the operator holds the handle portion 15 of the housing 10 with one hand to perform the work.

The operator operates the power switch 25 from off to on to turn on the power of the smoke detection device. The worker then moves closer to the server where smoke is likely to occur, for example, if the surveillance area is a computer room. When the operator reaches a place where smoke is likely to be generated, the operator operates the fan switch 28 to operate the suction unit 22. Then, the suction port 12 is directed to various places to suck air, and the smoke detection unit 21 detects the smoke concentration. Since the smoke concentration is displayed on the smoke concentration display unit 16 at hand, the operator can grasp the smoke concentration in real time. Further, if the display state of the alarm display unit 27 of the housing 1 changes according to the smoke concentration level and smoke is generated from the place where the suction port 12 is directed, it is immediately grasped. be able to.

In the smoke detection device of the present embodiment, the suction nozzle 10 and the smoke detection unit 21 are integrally provided in the housing 1 having the handle portion 15, so that the operator can use the suction port 12 in various places with one hand. It can be turned and is easy to handle. Further, the switch or the like provided in the housing 1 can be easily operated while the suction nozzle 10 is directed to various places.

Although the embodiment of the present invention has been described above, the application of the present invention is not limited to the present embodiment and may be variously applied within the scope of the technical idea thereof. For example, in the present embodiment, the handle portion 15 is formed in the shape of a handle, but may have another shape as long as the housing 1 can be gripped by hand. Further, a plurality of handle portions may be formed, and in that case, the handle portions may be provided in a portion of the suction nozzle 10 close to the housing 1.

Further, an operation switch including a micro switch may be provided in the vicinity of the suction port 12 at the tip of the suction nozzle 10. The operation switch is connected to the control unit 20 and is switched from off to on by pressing. When the suction nozzle 10 is brought close to the detection target and the operation switch near the suction port 12 comes into contact with the detection target and is turned on, the suction unit 22 is operated to suck air into the smoke detection unit 21. As a result, the suction unit 22 can be operated only when the suction port 12 approaches the detection target, so that battery consumption can be suppressed.

Further, the suction nozzle 10 may be detachable from the housing 1. In this case, when the smoke detection device is stored, the suction nozzle 10 can be removed from the housing 1 to improve the storability.

Further, the suction nozzle may be configured to be expandable and contractible. FIG. 6 shows a cross-sectional view of the suction nozzle 30 that can be expanded and contracted. The expandable suction nozzle 30 has, for example, a first pipe member 31 and a second pipe member 32. One end face of the first pipe member 31 has a small diameter opening 31a. Further, the other end surface of the first pipe member 31 has an opening 31b that substantially matches the outer diameter of the second pipe member 32. One end of the second pipe member 32 is arranged inside the hollow of the first pipe member 31, and an opening 32a is formed on the end face. Further, a protruding portion 32b that protrudes in the radial direction is formed in a portion of the second pipe member 32 that is arranged inside the hollow of the first pipe member 31, and is substantially compatible with the inner diameter of the first pipe member 31. is doing. The outer diameter of the projecting portion 32b is larger than the opening 32a of the first pipe member 31, and therefore, when the second pipe member 32 is extended, the projecting portion 32b is formed from the opening 32a of the first pipe member 31. You can't get out and you can stop at that position. Further, as shown by the broken line in the figure, the second pipe member 32 can slide with respect to the first pipe member 31 and be housed in the hollow interior. The end portion of the second pipe member 32 on the protruding portion 32b side can be brought into contact with the end surface of the first pipe member 31 on the opening portion 31a side so as not to move any further. As a result, the second pipe member 32 can be stored in the first pipe member 31, so that the length of the suction nozzle 30 can be shortened and the storage property can be improved. Further, since the hollow inside of each pipe member is communicated with each other in the length direction by the opening, air can be reliably sucked.

By adjusting the position of the center of gravity of the suction nozzle 10 or the housing 1, the handling can be made easier. Since the suction nozzle 10 has a long shape, it is difficult to handle it if the weight on the tip side is large. Therefore, by making the wall thickness smaller toward the tip side of the suction nozzle 10 so that the center of gravity is biased toward the root side, the maneuverability of the suction nozzle 10 toward various places is improved. Can be done.

Further, the position of the center of gravity of the housing 1 can be adjusted by arranging a heavy object inside the housing 1. FIG. 7 shows a front view when the position of the center of gravity of the housing 1 is adjusted. Since a heavy object such as a battery is provided in the housing 1, by adjusting the arrangement position, the center of gravity position 1a of the housing 1 is set on the surface where the suction nozzle 10 is provided rather than the center position of the handle portion 15. Can be closer to the other side. Further, it is desirable that the position of the center of gravity 1a of the housing 1 is closer to the lower surface on the side opposite to the upper surface where the handle portion 15 of the housing 1 is provided. By holding the handle portion 15 provided on the housing 1 by hand, the housing 1 is tilted so that the suction nozzle 10 side faces upward. Since the smoke rises upward, there are many places where the suction nozzle 10 is directed. Therefore, in the smoke detection device, the housing 1 is tilted so that the suction nozzle 10 faces upward, so that the maneuverability can be improved.

The position of the center of gravity of the housing 1 does not necessarily have to be closer to the center position of the handle portion 15, and the arrangement of heavy objects may be adjusted so as to be as far back as possible. This also makes it possible to improve the maneuverability of the suction nozzle 10 when holding the housing 1. Further, in order to adjust the position of the center of gravity of the housing 1, the weight member may be arranged in the housing 1. Further, by adjusting the position of the handle portion 15 in the housing 1, the position relative to the position of the center of gravity of the housing 1 can be changed so that the suction nozzle 10 can easily face upward.

1 Housing 10 Suction nozzle 11 Pipe part 12 Suction port 15 Handle part 16 Smoke concentration display part 20 Control part 21 Smoke detection unit 22 Suction unit 23 Power supply part 24 Power supply circuit part 25 Power supply switch 26 Reset switch 27 Alarm display part 28 Fan switch

Claims (2)

A suction nozzle with an air suction port and
It has a detection unit that detects the smoke concentration based on the smoke particles contained in the air sucked through the suction nozzle.
The suction nozzle is a portable smoke detection device characterized by being expandable and contractible. The suction nozzles are formed by slidably inserting a second pipe member into each of the hollow first pipe members.
A protruding portion protruding in the radial direction is provided on the outer periphery of one end of the second pipe member.
When the second pipe member is slid with respect to the first pipe member so that the length of the suction nozzle is maximized, the protruding portion of the second pipe member becomes the said portion of the first pipe member. The smoke detection device according to claim 1, wherein the smoke detection device is in contact with the inner surface on the outer peripheral side of the opening provided at the end portion on the center side of the suction nozzle.

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