JP3349569B2 - Sampling fire detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sampling type fire detecting device, and more particularly to a fire detecting device which measures the suction effect of a sampling pipe without smoke and is satisfactory in performance.

[0002]

2. Description of the Related Art A sampling tube (not shown) having at least one suction port, a fire detecting smoke detector and gas suction means (both not shown) provided at the base end of the sampling tube are provided. In a conventional sampling type fire detection device, a smoke tube or the like (not shown) is applied to the suction port of the terminal to know the suction effect of the sampling tube, and smoke is sucked from the suction port through a sampling tube having a length of several tens of meters. The response time from the terminal was measured with a smoke detector.

[0003]

However, a smoke tube or the like cannot generate smoke of a certain concentration.
There was a problem that it was not possible to compare the smoke density between the suction port and the smoke detector installation location. In addition, there is a problem that smoke cannot be emitted in an environment where fine particles such as dust and smoke cannot be used, such as in a clean room of a semiconductor factory, so that an appropriate device for knowing the suction effect of the sampling tube cannot be obtained. .

Accordingly, the present invention has been made in order to solve the above-mentioned problems, and has as its object to provide a sampling type fire detection device capable of measuring the suction effect of a sampling tube without smoking.

[0005]

In order to achieve this object, a sampling type fire detection device according to the present invention contains a gas and is attached to a suction port of a sampling pipe. A valve for releasing gas stored in the sampling pipe, and gas detection means provided on the base end side of the sampling pipe and detecting gas released from the gas cylinder into the sampling pipe via the valve and the suction port. And the sampling tube
It measures the suction effect . Further, the sampling type fire detection device of the present invention further includes a time measurement unit that starts counting at the same time as the valve is opened, and stops the counting when the gas detection unit detects the gas. It is provided. Further, the sampling type fire detection device according to the present invention includes a storage unit for storing a first output value of the gas detection unit, the storage unit storing a first output value of the gas detection unit, the storage unit indicating a concentration of the gas stored in the gas cylinder. Calculating means for calculating a dilution coefficient of the gas from a second output value of the gas detecting means, which represents a concentration of the gas, and the first output value stored in the storage means. Things.

[0006]

In the present invention, the time measuring means starts counting at the same time as the valve of the gas cylinder attached to the suction port of the sampling pipe is opened, and stops the counting when the gas detecting means detects gas. By doing so, the response time is measured.

[0007]

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic configuration diagram showing one embodiment of a sampling type fire detection device according to the present invention. In the figure, reference numeral 1 denotes a sampling tube which has at least one suction port 1a and has a smoke detector for detecting fire, such as an ultra-high-sensitivity smoke sensor 2, a gas detecting means such as a hydrogen sensor 3, in its base end 1b. And a gas suction means 4 such as a pump and a fan. Note that the smoke sensor 2, the hydrogen sensor 3, the fan 4, and the like may be provided in a housing, and the base end 1b of the sampling tube 1 may be connected to the housing.

Reference numeral 5 denotes a gas cylinder, for example, a hydrogen cylinder.
A valve that can be automatically opened and closed, such as a valve, for example, an electromagnetic valve 6, an electric valve, or a valve that can be manually opened and closed, is connected to the discharge port. The hydrogen cylinder 5 to which the solenoid valve 6 is connected is attached to one suction port 1 a of the sampling pipe 1 via a cover 7. In the test to measure the dilution coefficient described below,
If the gas from the hydrogen cylinder 5 suddenly flows into the sampling pipe 1, accurate measurement cannot be performed. For this reason, it is desirable to prevent the gas from flowing in abruptly by, for example, gradually opening the solenoid valve 6, but the cover 7 may be provided in this way. That is, when the solenoid valve 6 is opened, the gas from the hydrogen cylinder 5 is once diffused into the cover 7,
Since the gas is sucked into the sampling tube 1, a rapid inflow of gas can be prevented. In the test for measuring the response time, it is not particularly necessary to provide the cover 7.

Reference numeral 8 denotes a control device, which includes signal lines L1 and L
2 and L3, they are electrically connected to the smoke sensor 2, the hydrogen sensor 3, and the solenoid valve 6, respectively. This control device 8
A microprocessor MPU which controls the entire sampling type fire detection device and serves as a calculation means, a read-only memory ROM in which a program for operating the MPU is stored, a storage means in which signals and data are stored, for example, random access An interface I / F connected to the smoke sensor 2 by a memory RAM and a signal line L1
1. Interface I / F2 connected to hydrogen sensor 3 by signal line L2, interface I / F3 connected to solenoid valve 6 by signal line L3, interface I connected to a test switch, for example, test switch SW1 for response time measurement. / F4, an interface I / F5 connected to the dilution coefficient measurement test switch SW2, a timer T, and a display unit D.

The sampling type fire detection device of the present invention is configured as described above, and its operation will be described in detail with reference to the flowchart of FIG. First, as described above, after attaching the hydrogen cylinder 5 to which the solenoid valve 6 is connected to one suction port 1a of the sampling pipe 1, the test switch of the control device 8, for example, SW1 is closed. The closing signal of SW1 is taken into the MPU via the I / F4. Therefore, in step S1, it is determined whether there is a switch input, and
If there is, in step S2, it is determined which test switch has received the switch input. As a result, if the MPU is found to be SW1, the MPU issues a command in step S3 to start time measuring means, for example, a timer T, and issues a command via the I / F 3 and the signal line L3 to switch the solenoid valve 6 on. Let open. When the solenoid valve 6 is opened in this manner, the predetermined concentration, for example, 100
0 ppm of hydrogen gas (or a volatile solvent from a container not shown) is injected into the sampling tube 1 and is sucked by the fan 4 toward the base end 1b.
To reach. In step S4, the hydrogen sensor 3 sends the first output value O1, especially the rising value, representing the concentration of the hydrogen gas contained in the hydrogen cylinder 5 to the MPU via the signal line L2 and the I / F2. The first output value O1 is stored in the RAM, and the timer T is set in step S5.
Is stopped and the solenoid valve 6 is closed. The response time of the timer T is displayed on the display unit D in step S6.

Next, when the test switch SW2 is closed, the signal for closing the switch SW2 is taken into the MPU via the I / F 5, so that the program is executed from step S2 to step S7.
Then, the MPU issues a command to open the solenoid valve 6 for a predetermined time, for example, several seconds to several tens of seconds, and the second output value O2 from the hydrogen sensor 3 representing the gas concentration after the predetermined time becomes constant. Then, in step S9, the dilution coefficient of the hydrogen gas is calculated. The calculation of the dilution coefficient can be obtained from the first output value O1 stored in the RAM and the second output value O2 just obtained, for example, by the formula O2 / O1. Instead of the first output value O1, a value representing the concentration of the gas stored in the hydrogen cylinder 5 is previously set in the RO.
M, and this stored value may be used. After that, the obtained dilution coefficient is displayed on the display unit D in step S6, so that the suction effect of the sampling tube 1 can be known. In the embodiment, the case where the terminal suction port 1a is tested has been described. However, the test may be similarly performed by attaching the cover 7 to another suction port.

[0012]

According to the present invention, as described above, the suction effect of the sampling tube can be measured without smoking, and the gas suction means can be measured by using the measurement result. By changing the performance of the pump, the diameter of the sampling pipe, the number of suction ports, and the like, it is possible to obtain a fire detection device that is satisfactory in performance.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the embodiment of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sampling tube 1a Suction port 1b Base end 2 Smoke sensor 3 Hydrogen sensor 4 Fan 5 Hydrogen cylinder 6 Solenoid valve 8 Control unit MPU Microprocessor RAM Random access memory ROM Read only memory T Timer

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) G08B 17/00-17/12 G08B 23/00-31/00

Claims (3)

(57) [Claims] 1. A sampling type fire detection device comprising: a sampling pipe having at least one suction port; a fire detection smoke detector and gas suction means provided at a base end of the sampling pipe; A gas cylinder to be housed and attached to the suction port; a valve connected to the gas cylinder to release the gas stored therein; provided on the base end side, from the gas cylinder via the valve and the suction port And a gas detecting means for detecting gas released into the sampling pipe, and measuring a suction effect of the sampling pipe . 2. The apparatus according to claim 1, further comprising a time measuring means for starting counting at the same time as the valve is opened, and for stopping the counting when the gas detecting means detects the gas. The sampling type fire detection device according to claim 1. 3. A storage unit for storing a first output value of the gas detection unit, the storage unit storing a first output value of the gas detection unit, the storage unit storing the first output value of the gas detection unit, and the gas concentration after a predetermined time after the valve is opened.
A calculating means for calculating a dilution coefficient of the gas from a second output value of the gas detecting means and the first output value stored in the storage means. Item 4. The sampling type fire detection device according to Item 1.