JPH074040Y2 - Gas monitoring device for starting fire extinguishing equipment - Google Patents

Description

[Detailed Description of the Invention] ○ Industrial field of application The present invention is applied to a gas container for starting fire extinguishing equipment at all times.
When the mass of the starting gas is monitored and a certain amount is reduced,
The present invention relates to a monitoring device that detects this and issues a warning signal.

-Prior art Carbon dioxide is generally used as a starting gas in fire extinguishing equipment that uses carbon dioxide, halogen compounds or powder fire extinguishing agents.

The above-mentioned starting gas usually stores the necessary minimum amount, but in the normal case, if it leaks from the starting gas container and is reduced to less than the minimum amount necessary for starting, In case of fire, it does not serve as fire extinguishing equipment at all.

Therefore, a device for constantly monitoring the decrease amount of the starting gas is required.

In recent years, highly reliable equipment and systems have been required for fire extinguishing equipment, and the equipment and systems are always kept in a normal state. There is a need for fully automatically controlled equipment that does not rely on force. However, the present situation is that the monitoring device for the amount of gas for starting fire extinguishing equipment has not been put into practical use.

○ Problems to be solved by the present invention The reason why the starting gas amount monitoring device for fire extinguishing equipment has not been put into practical use is because of the following problems.

Carbon dioxide, a halide, etc. are generally used as a starting gas for a fixed fire extinguishing facility, and are filled in a container as liquefied gas. However, in the case of a liquefied gas, as long as the liquid exists inside the container, that is, even if the liquid is reduced in volume by leakage, the internal pressure does not change if the temperature is constant. On the contrary, even if the amount is not reduced, the pressure changes if the ambient temperature changes. Therefore, unlike the compressed gas such as nitrogen, the leakage of the starting gas cannot be detected by monitoring the internal pressure. Therefore, although it is to monitor the mass, there are two possible methods for monitoring the mass, one is a method of suspending the object through a load sensor, and the other is a method of suspending the object by the load sensor. It is a method to put on.

Examples of the former method are Japanese Patent Application No. 63-26697 “calibrator for extinguishant storage container” and Japanese Patent Application No. 1-111417 “monitoring device for fire extinguishing equipment”. These are designed for large capacity (eg 701) fire extinguishing agent storage containers, and have a large suspension mechanism, and for small capacity (eg 21) starting gas containers, the entire monitoring device becomes large. , Not suitable.

In the latter method, that is, there is a method in which the starting gas container is placed on a load sensor, for example, an electronic platform scale, the gas container outlet and the fixed pipe are connected, and the mass is constantly monitored. Has the following problems.

The starting gas is usually filled with 1 kg, and in order to accurately detect this mass with an accuracy of at least 1/100 (1000 g × 1/100 = 10 g in this example), at least the platform scale and the sensor must have at least
An accuracy of 1/500 (2g in this example) is required. However, compared to the flavor mass, the mass ratio of the starting gas is extremely small (about 1/10 in this example), so the accuracy of the sensor is 1/50.
00 is required. Due to technological advances in recent years, electronic platform scales with a high precision of 1/5000 to 1/6000 are commercially available. In this case, the measured object is an earthquake, mechanical vibrations such as a pump, or ventilation flow. Also, it is a necessary condition that the human body is completely stationary without being affected by an external force such as an inadvertent vibration or shock by a human being, but it is extremely difficult to satisfy the necessary condition.

Also, in fixed-type fire extinguishing equipment, it is unstable to simply place the starting gas container on the plate of the platform scale, and it is easily affected by external force.In addition, it is also affected by the connection with external fixed piping. There is a problem that cannot be ignored.

○ Means for Solving the Problems The present invention is to set the starter gas container still in the container guide on the stand of the electronic platform scale mounted in the housing, and use the rocking stop metal fitting of the starter gas container for the starter gas. It is attached to the housing with a slight gap between the circumference of the container and the starting gas pipe outside the housing and the starting gas container valve outlet is connected by a flexible pipe to the starting gas container. Control that eliminates the change in the signal of the electronic platform scale due to vibration and monitors the mass of the starting gas by reading the mass of the starting gas multiple times at regular time intervals and comparing each of them. A panel is installed to monitor the mass of the starting gas with high accuracy even when an external force is temporarily applied.

[Examples] Hereinafter, the present invention will be described based on examples shown in the drawings.

With reference to FIGS. 1 to 3, the electronic platform scale 4 is fixed to the inner floor of the steel casing 1 with machine screws 17. Electronic platform scale 4
Is, for example, a weighing device of 20 kg, an accuracy of 1/5000, and an output of 4 to 20 mA. A cylindrical container guide 6 having an inner diameter slightly larger than the outer diameter of the starting gas container 3 is welded to the center of the plate 5 of the electronic platform scale 4. The starting gas container 3 is inserted inside the container guide 6 and stands upright on the electronic platform scale 4.

On the other hand, brackets 15 and 15 are welded to the inside of the casing 1 in two steps, and each bracket 15 has an inner diameter that is slightly larger than the inner diameter of the container guide 6 and is used to prevent the starting gas container 3 from shaking. The container band 7 is fixed with machine screws 18 and nuts 18 '.

An opener 9 is attached to the container valve 11 of the starting gas container 3, and the electric wire of the opener 9 and the electric wire 8 of the electronic platform scale 4 are connected to the terminal block 14.

A flexible pipe 12 having a sufficient length is connected between the outlet of the container valve 11 and the external pipe connecting nipple 13 fixed to the housing 1. The door 2 is normally closed by a handle 16 and a clasp 19.

In the present invention, since the starting gas container 3 is supported as described above, when the starting gas container 3 is in a stationary state, the container bands 7 and 7 and the brackets 15 and 15 are the starting gas containers. 3, the flexible tube 12 is loosened with a sufficient margin, so that no external force acts on the starting gas container 3. Further, since the starting gas container 3 is housed in the steel casing 1, it is not affected by the ventilation flow or careless contact of a person.

When vibration or artificial impact is applied to the entire device due to an earthquake or the like, the starting gas container 3 temporarily tilts slightly and comes into contact with the container bands 7 and 7, the brackets 15 and 15,
It affects the mass of the starting gas container 3 detected by the electronic platform scale 4. However, in the present invention, the gap between the bracket 15, 15 and the container band 7, 7 and the outer surface of the starting gas container 3 is small, and even if it is tilted, the angle is small, and when the external force is removed, the stand still upright as before. Return to the state. Also,
In the returned state, even if the starting gas container 3 horizontally moves by the gap with the container guide 6 (that is, even if one side of the starting gas container 3 comes into contact with the container guide 6), In the invention, since the gap between the brackets 15 and 15, the container band 7 and the outer surface of the starting gas container 3 is slightly larger than the gap between the container guide 6 and the starting gas container 3, the starting gas is The container 3 is a bracket 15.1
5, Do not touch the container band 7 ・ 7.

Next, another feature of the present invention will be described with reference to FIGS.

FIG. 4 shows the monitoring panel A, which has a warning lamp 20 for reducing the weight, a digital display 21 for displaying the container number of the starting gas container 3 and the starting gas amount, an alarm buzzer 22, an initial setting switch 23. A display switch 24, a step switch 5, a print switch 26, and a printer 27 are provided.

FIG. 5 is a system configuration block diagram, in which n start-up gas container units B1, B2 ... B _n-1 and B _n are provided on the monitoring panel with wires C1 and C2, respectively.
… Cn _-1 and Cn are connected. FIG. 6 is a flow chart of the starting gas amount monitoring controlled by the microcomputer control unit (not shown) built in the monitoring board A.

This flow is started when the initial setting switch 23 is turned on.

The control block D1 is an initial value storage circuit, and the starting gas container 3
After confirming that the
When 23 is turned on, the mass of each of the n starting gas containers 3 at that time is stored as an initial value (hereinafter Wio, i is 1 to n) in a storage device (not shown) in the monitoring panel A. The determination of the weight reduction and the calculation of the weight reduction value in this flow are all performed by comparison with the initial value Wio.

The control block D2 is a starting gas container mass reading circuit and an erroneous signal canceling circuit. First, the mass (Wio, i is 1 to n) of each of the n starting gas containers 3 is sequentially read to _{1 to n} , and temporarily stored as W1o, W2o, ... Wn-1o, Wno. To do. By the way, when an external force such as an earthquake is applied to the starting gas container unit immediately before or during the reading flow, the mass Wio of the starting gas container detected by the electronic platform scale temporarily changes as described above. However, it may not show a true value. If this value is sent as it is to the following flow, there is a possibility that a false alarm will be issued. Therefore, in the present invention, as described above, the mass of each of the n starting gas containers 3 is
After reading the Wio, the temporary external force is removed, and after a time (for example, 30 seconds) when the starting gas container 3 is expected to return to the original stationary state, each of the n starting gas containers 3 is restarted. The mass (Wi, i is 1 to n) of 1 to n in order,
W1, W2 ... W _n-1 and W _n . Here, the first reading W10 of the mass of the first starting gas container 3 and the second reading W1 are compared, and when W10 = W1 is established, the detected mass W10 or W1 is the true value. When W10 ≠ W1, it is assumed that either or both of the detected masses W10 and W1 are not true values. This comparison is performed for n starting gas containers 3, and if any one of the masses of the n starting gas containers 3 is considered not to be a true value, the flow of this control block D2 is changed. Repeat,
When it is considered that the masses of the n starting gas containers 3 are all true values, the process proceeds to the following flow.

The control block D3 is a weight reduction value and remaining starting gas amount calculation circuit, and the weight reduction value (hereinafter, ΔWi, i is 1 to n) is ΔWi = W0i−Wi
Since the starting gas is initially filled with 1 kg, the remaining starting gas amount (hereinafter Wsi, i is 1 to n) is Wsi = 1.
-Calculated by ΔWi. In this flow, for the first starting gas container 3, ΔW1 = W01−W1 and Wsi = 1−
ΔW1 is calculated, and sequentially calculated up to the nth number and stored, and the flow proceeds to the following flow.

The control block D4 is an abnormality determination and alarm output circuit, and in this example, 5% (0.05 kg) of 1 kg of starting gas initially filled.
When the amount is reduced more than that, it is determined to be abnormal and an alarm is set. In this flow, first, when ΔW1 ≧ 0.05 is satisfied for the first starting gas container 3, the alarm lamp 20 corresponding to the corresponding starting gas container 3 is turned on, the alarm buzzer 22 is sounded, and the alarm is transferred to the outside. After outputting the signal, the determination is performed for the second starting gas container 3. ΔW1 <
When the value is 0.05, the alarm process is not performed and the second starting gas container 3 is processed. After that, the process is repeated up to the nth, and the process proceeds to the following flow.

The control block D5 is a digital display and printer output circuit.When the display switch 24 is turned on, the digital display 21 displays the container number of the first starting gas container and the remaining starting gas amount Wsi. [For example, 01-0.98]. Thereafter, every time the step switch 25 is turned on, the container numbers of the starting gas container numbers 2 to n and the remaining starting gas amount corresponding to each are sequentially displayed. Next, if the print switch 26 is turned on, the recording paper on which the container numbers of all the starting gas containers and the remaining starting gas amounts corresponding to each are printed by the printer 27 is output.

The control block D5 is a monitoring cycle setting circuit, which is a timer circuit for periodically executing the flow from the control blocks D2 to D6. Even if the leakage of the starting gas from the starting gas container 3 does not occur suddenly,
It is sufficient to monitor at time intervals. Therefore, in this embodiment, the cycle is set to 12 hours, and D2 ~
The flow of D5 will be repeated.

○ Effect of the invention The invention eliminates a change in the signal of the electronic platform scale, that is, an erroneous signal due to an external force such as vibration to the starting gas container, and eliminates the mass of the starting gas multiple times at regular time intervals. Since a control panel (monitoring panel) that monitors whether or not the amount of starting gas has been reduced is provided by reading each of the above, the amount of starting gas can be measured not only in the static value state but also when external force is temporarily applied. Can be monitored with high accuracy and a highly reliable starting gas monitoring device can be provided.

[Brief description of drawings]

The drawings show a starting gas monitoring device according to an embodiment of the present invention,
1 is a perspective view, FIG. 2 is a plan view, and FIG. 3 is a longitudinal sectional view. FIG. 4 is a front view of the control panel. FIG. 5 is a system configuration block diagram. FIG. 6 is a flow chart showing the operation of the microcomputer controller of the control panel. 3 ... Startup gas container 4 ... Electronic platform scale 6 ... Container guide 7 ... Container band 12 ... Flexible tube

Claims (1)

[Scope of utility model registration request] 1. A starting gas container used for carbon dioxide extinguishing equipment, halogen compound extinguishing equipment or powder extinguishing equipment is placed on a stand of an electronic platform scale, and the mass of the starting gas container is detected by the electronic platform scale. In the starting gas amount monitoring device for fire extinguishing equipment that monitors the reduction of the starting gas, the starting gas container is left stationary in the container guide on the table of the electronic platform scale installed in the housing. The container shake-preventing metal fitting is attached to the housing with a slight gap between the surroundings of the starting gas container, and a flexible pipe is provided between the starting gas pipe outside the housing and the starting gas container valve outlet. Connect to eliminate the change in the signal of the electronic platform scale due to the vibration of the starting gas container due to the vibration of the starting gas container, and read the mass of the starting gas multiple times at regular intervals. You By installing a control panel to monitor whether or not the starting gas is reduced, the mass of the starting gas can be monitored with high accuracy even when external force is temporarily applied. Gas amount monitoring device.