JP2011145107A - Method and inspection set of detecting air leaking point of air tube of differential distribution type heat sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow detection of an air leaking point of an air tube when an air leak is recognized in the air tube by performing an operation test of a differential distribution type heat sensor of an air tube type. <P>SOLUTION: An inspection set comprises: a gas feeder (1) feeding a reactive gas to the air tube of the heat sensor; a gas detector (2) detecting the reactive gas; and an air injection pump (3) replacing the reactive gas in the air tube with air. The gas feeder (1) is equipped with: a gas cylinder (17); a gas injection tube (10) into which the reactive gas is injected; a going path tube (12) and a return path tube (13) connected to the gas injection tube (10) and including valves (120, 130), respectively; a tube connector (14) connecting an air tube going path part (461) disconnected from the heat sensor to the going path tube (12) and connecting an air tube return path part (462) to the return path tube (13); and a pressure gauge (15) measuring a gas pressure of the return path tube (13). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method and a test set for detecting an air leak location of an air pipe of a differential distributed heat sensor. More specifically, when an air tube type differential distributed heat sensor is subjected to an operation test and the air enclosed in the air tube is leaking, a method and an inspection capable of detecting the leak location are detected. Regarding the set.

  A differential distributed heat detector (hereinafter sometimes referred to simply as a “heat detector”) detects the occurrence of a fire and emits a signal or sound when the rate of increase in ambient temperature exceeds a certain level. Etc. to inform the surroundings. The heat detector is roughly classified into an air tube type, a thermocouple type, and a thermal semiconductor type, and among these, an air tube type that is less likely to break down and has stable performance is often used.

  The air pipes of heat detectors are stretched over several tens of meters, for example, on the ceilings of various factories, workshops, gymnasiums, cultural properties, etc. There was a case that a hole was opened due to deterioration or damage of the construction work. In this case, since the air enclosed in the air pipe leaks from the hole, the heat sensor does not operate normally.

  Therefore, in order to maintain the performance of the heat sensor, it is obliged to periodically test the operation of the heat sensor. As an example of an apparatus for performing an operation test of an air tube type heat sensor, there is a test apparatus described in Patent Document 1.

  In this test apparatus, the connection part is connected to the connection part on the heat sensor side, the adjustment screw is screwed into the adjustment chamber at a predetermined speed by an electric driver, and air is injected from the pressure injection part into the air pipe through the injection port. The air pressure of the air pipe is detected by the pressure sensor via the pressure measuring unit, and the control unit controls the speed of the electric driver so that the air pressure detected by the pressure sensor becomes a predetermined rate of increase, and the specified time If a fire occurrence signal is output from the fire detector of the heat detector when it has passed, the operation of the heat detector is judged normal, and the differential distribution type heat detector can be easily tested. It can be done.

JP 2003-77074 A

However, the test apparatus described in Patent Document 1 has the following problems.
That is, if the test apparatus is used, it is possible to detect whether or not air is leaking from the air pipe, but even if it is found that air is leaking, the location cannot be specified. Usually, the work of identifying where air is leaking from an air pipe stretched at a high place over several tens of meters or more is a difficult work that requires a lot of labor, including the installation of a scaffold. Therefore, if the air test reveals that air in the air pipe is leaking, the work to identify and repair the air leaking part (the air leaking part) is not performed, and the entire air pipe is replaced. Is the actual situation.

(Object of the present invention)
The present invention provides a method and an inspection set capable of detecting an air leak location when an air pipe is leaked by performing an operation test of an air pipe type differential distributed heat sensor. The purpose is to do.

Means taken by the present invention to solve the above-mentioned problems are as follows.
(1) The present invention
Inject the reaction gas into the air pipe of the differential distributed heat sensor,
A gas detector is used to check whether there is a reaction of the reaction gas in the gas detector along the installed air pipe,
Identify the location where the reaction of the reaction gas has occurred in the gas detector as the leak location,
This is a method for detecting a leak location of an air pipe of a differential distributed heat sensor.

(2) The present invention
A gas feeder for feeding the reaction gas to the air pipe of the heat detector;
A gas detector for detecting the reaction gas;
Consists of
The gas feeder is
Reactive gas supply means;
A gas feed pipe for sending the reaction gas supplied from the reaction gas supply means to the air pipe of the differential distributed heat detector;
A pressure gauge for measuring the gas pressure in the air pipe;
With
It is a test set for detecting a leak point of an air pipe of a differential distributed heat sensor.

(3) The present invention
A gas feeder for feeding the reaction gas to the air pipe of the heat detector;
A gas detector for detecting the reaction gas;
Consists of
The gas feeder is
Reactive gas supply means;
A gas injection pipe into which the reaction gas is injected from the reaction gas supply means;
Connected to the gas injection pipe, each of the forward pipe and the return pipe each having a valve;
A pipe connecting means for connecting an air pipe forward path part disconnected from the heat sensor to the forward pipe, and connecting an air pipe return path part disconnected from the heat sensor to the return pipe;
A pressure gauge for measuring the gas pressure in the return pipe;
With
It is a test set for detecting a leak point of an air pipe of a differential distributed heat sensor.

(4) The present invention
It is equipped with an air injection pump that injects air into the air pipe and replaces the reaction gas in the air pipe with air.
It is a test | inspection set which detects the leak location of the air pipe of the differential type | mold distributed heat sensor of said (2) or (3).

  As the “reactive gas” in the claims and specification, it is preferable to employ a gas that can be reliably detected by a gas detector, has no toxicity, and has a low environmental load. For example, alternative fluorocarbons (hydrochlorofluorocarbons (HCFCs) or hydrofluorocarbons (HFCs) typified by HFC-134a), which are greenhouse gases but are less likely to destroy the ozone layer, It is not limited to this.

(Function)
The operation of the test set according to the present invention will be described. Here, the constituent elements used in the description are assigned in correspondence with the reference numerals given to the respective parts in the embodiments described later. These reference numerals are the same as the reference numerals described in the claims of the claims. Similarly, it is only for the purpose of facilitating the understanding of the contents, and the meaning of each component is not limited to each of the above parts.

When an air pipe differential heat detector (4) is tested and air leakage is found in the air pipe (46), the differential heat detector (4) The forward path part (461) and the return path part (462) of the air pipe (46) are removed from the connection point of the gas feeder (1).
Next, the air pipe forward path part (461) is connected to the forward pipe (12) of the gas feeder (1) via the pipe connecting means (14), and the air pipe return path part (462) is connected to the return pipe (13). Connect to. The return pipe (13) side is opened to the atmosphere by opening a valve or the like.

  The reactive gas is supplied to the gas injection pipe (10) at a predetermined gas pressure by the reactive gas supply means (17). Since the return pipe (13) side is open to the atmosphere, the reaction gas passes through the forward pipe (12), which is a gas feed pipe, and enters the air pipe (46) from the air pipe forward section (461). (46) Push out the air inside and replace it with air. When the air in the air pipe (46) is replaced with the reaction gas, the return pipe (13) side is closed to prevent the gas from being discharged into the atmosphere. The gas pressure at the end of the return pipe (13) is substantially measured by the pressure gauge (15) as the gas pressure inside the air pipe (46).

In this manner, the reaction gas is supplied to the air pipe (46) at a predetermined gas pressure, so that the reaction gas is leaked from the air leakage portion (460) of the air pipe (46).
Then, the gas detector (2) is moved along the air pipe (46) installed on the ceiling or the like of the building, and it is inspected whether or not there is a reaction of the reaction gas in the gas detector (2). Then, the part where the reaction of the reactive gas has been observed visually, and the leaking part (460) is identified and repaired.

  After repairing the leaking part (460), the reaction gas is again supplied to the air pipe (46) with a predetermined gas pressure to increase the pressure, and whether or not there is any pressure reduction is confirmed on the display of the pressure gauge (15). If there is no pressure reduction, it is judged that there is no leakage, the exhaust valve (18) at one end of the gas injection pipe (10) is opened and exhausted, the residual pressure in the air pipe (46) is released, and the inspection is completed. To do.

  Remove the air pipe forward path part (461) and the air pipe return path part (462) from the pipe connecting means (14), and one side of the air pipe forward path part (461) and the air pipe return path part (462) is opened to the outside as it is. The air injection pump (3) is connected to the other side. Then, air is sent into the air pipe (46), the reaction gas is discharged from the air pipe (46) and replaced with air, and then the air pipe forward path part (461) and the air pipe return path part (462) are restored to the original state. Connect to the connection point of the differential distributed heat sensor (4).

  The present invention relates to a method and an inspection set for performing an operation test of an air tube type differential distributed heat sensor, and in the case where air leak is recognized in the air tube, the leak location can be easily detected. Can be provided.

An embodiment of the inspection set concerning the present invention is shown, (a) is a gas feeder, and (b) is an explanatory view of a gas detector. Explanatory drawing which shows the outline of an air tube | pipe type differential distribution type heat sensor. Explanatory drawing which shows the outline at the time of performing the operation test of a differential distribution type heat sensor of an air pipe type. Explanatory drawing of the state which has detected the leak location using the test | inspection set, when there is a leak in an air pipe by an operation test. Explanatory drawing of the state which discharged | emitted the reaction gas which remained in the air pipe after the repair of the air pipe, and replaced with air.

  The present invention will be described in detail based on the embodiments shown in the drawings.

First, the configuration and structure of the inspection set A will be described with reference to FIG.
In the inspection set A, when the operation test of the air tube type differential distributed heat sensor is performed, the air enclosed in the air tube leaks from the hole opened due to deterioration or corrosion of the air tube. In this case, the leak location can be detected.

The inspection set A includes a gas feeder 1 (shown in FIG. 1A), a gas detector 2 and an air injection pump 3 (all shown in FIG. 1B).
The gas feeder 1 includes a gas injection pipe 10 made of metal (made of brass in the present embodiment). An exhaust valve 18 is provided on one end side (left side in FIG. 1A) of the gas injection pipe 10, and a connection port 100 is provided on the other end side. A valve 11 is attached near the end of the gas injection pipe 10 on the connection port 100 side. Note that a gas pipe 16 is connected to the connection port 100 as described later.

  A return pipe 13 is connected to an end of the gas injection pipe 10 on the exhaust valve 18 side, and a forward pipe 12 is connected between the return pipe 13 and the valve 11. A valve 130 is attached to the base of the return pipe 13, and a valve 120 is attached to the base of the forward pipe 12. The forward pipe 12 and the backward pipe 13 are made of a synthetic resin having flexibility, and their tips are connected to a pipe connector 14 that is a pipe connecting means. On the opposite side of the pipe connector 14 to the side where the forward pipe 12 and the backward pipe 13 are connected, terminal receptacles 141 and 142 for connecting an air pipe forward path part 461 and an air pipe return path part 462 described later are provided. .

  A blocking portion 101 is provided between the connecting portions of the forward pipe 12 and the backward pipe 13 of the gas injection pipe 10 so that ventilation cannot be performed. A pressure gauge 15 is attached to a portion of the gas injection pipe 10 that communicates with the valve 130. Thereby, the pressure gauge 15 can measure the gas pressure at the end of the return pipe 13. The pressure gauge 15 measures the gas pressure inside the air pipe 46 substantially connected to the return pipe 13 and is a gas pressurization analyzer.

  One end of a synthetic resin gas pipe 16 is connected to the connection port 100 of the gas injection pipe 10. The other end of the gas pipe 16 is connected to a gas cylinder 17 which is a reaction gas supply means. In the present embodiment, a gas cylinder 17 filled with HFC-134a gas, which is an alternative chlorofluorocarbon, is used as the reaction gas. The HFC-134a gas supplied from the gas cylinder 17 is sent to the forward pipe 12 by opening the valve 11 and the valve 120 of the gas injection pipe 10.

The gas detector 2 is a detector that can detect the HFC-134a gas with high sensitivity, and includes a gas sensor 20 at the tip. The gas detector 2 is fixed to the tip of the long handle 21 so that detection can be performed along an air pipe 46 that is usually stretched around a high place such as a ceiling.
In addition, the air injection pump 3 identifies the leak location of the air pipe 46 with the gas feeder 1, repairs the leak location, and then injects air into the air tube 46 to replace the HFC-134a gas. It is a pump for. In addition, the capacity | capacitance of the air injection pump 3 is suitably set, for example so that replacement may be completed by several injections.

(Function)
With reference to FIG. 1 thru | or FIG. 5, the detection method of the leak location using the test | inspection set A which concerns on this Embodiment, and the effect | action of the test | inspection set A are demonstrated.
First, with reference to FIG.2 and FIG.3, the outline of the structure and operation test of the air pipe type differential distributed heat sensor 4 used as the object of the detection work of a leak location are demonstrated.

  The differential distributed heat sensor 4 includes a cock stand 40, and a switching cock 41 is housed in the cock stand 40 so as to be freely rotatable. The cock stand 40 includes an outward passage passage hole 42 for connecting an air passage forward portion 461 of an air pipe 46 stretched around a ceiling of a building, a return passage passage hole 43 and a test hole 44 for connecting an air tube return passage 462. Is formed. The air tube 46 is a copper thin tube, and its outer surface is covered with a synthetic resin coating.

A control channel 410 having a predetermined shape is formed in the switching cock 41. The forward flow path hole 42 is connected to the control flow path 410 of the switching cock 41. The return flow path hole 43 is connected to the diaphragm 45 via the communication pipe 430 on the one hand, and connected to the control flow path 410 of the switching cock 41 on the other hand. The leak hole 47 connected to the return flow path hole 43 is for canceling expansion / contraction caused by daily temperature change of the air in the air pipe 46.
The test hole 44 is connected to the control flow channel 410 of the switching cock 41 when performing an operation test of the differential distributed heat sensor 4, and an injection pipe (not shown) for injecting test air into the air pipe 46 is provided. To connect.

  In the differential distributed heat sensor 4, the state shown in FIG. 2 is a monitoring state in which the occurrence of a fire is monitored. In the flow path from the air pipe 46 to the diaphragm 45, the leak hole 47 is provided. Except sealed. In this state, when a fire occurs and the air in the air pipe 46 rapidly expands, the adjusted exhaust from the leak hole 47 cannot keep up, the diaphragm 45 is deformed by the pressure of the internal air, and the electrical contact 450 comes into contact. Then, power is supplied, and thereby a notification operation is performed.

  Further, the state shown in FIG. 3 is the one when an operation test of the differential distributed heat sensor 4 is performed. That is, the switching cock 41 is rotated in the direction of the arrow by a handle or the like (not shown), and the forward passage hole 42 and the test hole 44 communicate with each other via the control passage 410 of the switching cock 41. The return flow path hole 43 is not connected to the control flow path 410 of the switching cock 41 and is connected only to the diaphragm 45.

  In this state, an injection tube is connected to the test hole 44, and a predetermined amount of test air is injected into the air tube 46. If there is no leakage in the flow path including the air pipe 46, the diaphragm 45 is deformed by the pressure of the air inside, and the electrical contact 450 is contacted and energized, whereby a notification operation is performed. However, if there is air leakage in the flow path including the air pipe 46, the air pressure inside the diaphragm 45 does not rise sufficiently. For this reason, since the diaphragm 45 is not deformed and the electrical contact 450 is not in contact, the notification operation is not performed.

  As described above, when the test air is not normally operated even when the test air is injected into the air tube 46, first, leakage due to a hole due to aging of the air tube 46 or the like is suspected. The operation of detecting this air leakage location is performed using the inspection set A. The usage method and operation of the test set A are as follows.

Please refer to FIG. 1, FIG. 4, and FIG.
(1) The air pipe forward path part 461 and the air pipe return path part 462 of the air pipe 46 are removed from the forward path channel hole 42 and the return path channel hole 43, and the air pipe forward path part 461 is removed from the pipe connector 14 of the gas feeder 1. The terminal receiver 141 is connected, and the air pipe return path 462 is connected to the terminal receiver 142 (see FIG. 4).

(2) The valve (reference number omitted) of the gas cylinder 17 is opened, the valves 11, 120, 130 and the exhaust valve 18 of the gas injection pipe 10 are opened, and the reaction gas (HFC-134a) is sent to the forward pipe 12. The reaction gas passes through the forward pipe 12 and enters the air pipe 46 from the air pipe forward part 461, and pushes out the air inside the air pipe 46 to be replaced with air. When the air in the air pipe 46 is replaced with the reaction gas, the exhaust valve 18 is closed. The gas pressure at the end of the return pipe 13 (substantially the gas pressure inside the air pipe 46) is measured by the pressure gauge 15. In the present embodiment, the gas pressure is increased to 0.3 MPa, and the reaction gas is leaked from the leaking portion 460 of the air pipe 46.

(3) The gas detector 2 is moved along the air pipe 46 laid on the ceiling or the like of the building, and it is inspected whether or not the gas detector 2 has a reaction of the reactive gas. This inspection is performed over the entire length of the air pipe 46. Then, the place where the reaction of the reactive gas is visually observed, the leaking place 460 is specified, and repaired with a sleeve 463 such as a metal tube.

(4) After repairing the leaking portion 460 of the air pipe 46, supply the reaction gas to the air pipe 46 again and pressurize to 0.3 MPa, and check the pressure gauge 15 for the presence of reduced pressure. To do. If there is no pressure reduction, it is determined that there is no leakage, the exhaust valve 18 of the gas injection pipe 10 is opened and exhausted, the residual pressure in the air pipe 46 is released, and the inspection ends.

(5) The air pipe forward path part 461 and the air pipe return path part 462 are removed from the terminal receivers 141 and 142 of the pipe connector 14, the air pipe forward path part 461 is connected to the forward path channel hole 42, and the air pipe return path part 462 is left as it is. Keep open to the open air. Then, the air injection pump 3 is connected to the test hole 44 through a tube, air is sent into the air pipe 46, the reaction gas is discharged from the air pipe return path 462 to the outside air, and the gas inside the air pipe 46 is exchanged with air. Replace. Note that this replacement work can be performed by sending air by other means instead of the air injection pump 3.

(6) Finally, the air pipe return path 462 is connected to the return path hole 43, the switching cock 41 is rotated and returned to its original position, the air injection pump 3 is removed from the test hole 44, and the monitoring shown in FIG. State.

  As described above, according to the inspection set A according to the present embodiment, when there is a leak in the air tube 46 of the differential distributed heat sensor 4, the leak location 460 can be easily detected. Therefore, the differential distributed heat sensor 4 can be normally operated by repairing the leak point 460. Therefore, it is not always necessary to replace the entire air pipe 46 as in the prior art, which is extremely useful for reducing the work time, labor, and cost for maintenance.

  Note that the terms and expressions used in this specification are merely explanatory and are not limiting at all, and terms and expressions equivalent to the features described in this specification and parts thereof. There is no intention to exclude. It goes without saying that various modifications are possible within the scope of the technical idea of the present invention.

A Inspection set 1 Gas feeder 10 Gas injection pipe 100 Connection port 101 Blocking portion 11 Valve 12 Outward pipe 120 Valve 13 Return pipe 130 Valve 14 Pipe connection 141 Terminal receiver 142 Terminal receiver 15 Pressure gauge 16 Gas pipe 17 Gas cylinder 18 Exhaust Valve 2 Gas detector 20 Gas sensor 21 Handle 3 Air injection pump 4 Differential distribution type heat detector 40 Cock stand 41 Switching cock 410 Control flow path 42 Forward flow path hole 43 Return flow path hole 430 Communication pipe 44 Test hole 45 Diaphragm 450 Electrical contact 46 Air pipe 460 Leak location 461 Air pipe forward path 462 Air pipe return path 463 Sleeve 47 Leak hole

Claims (4)

Inject reaction gas into the air pipe (46) of the differential distributed heat sensor,
Using the gas detector (2), check whether the gas detector (2) has a reaction of the reactive gas along the installed air pipe (46),
Identify the location where the reaction of the reaction gas has occurred in the gas detector (2) as the leak location,
A method of detecting a leak location of an air pipe of a differential distributed heat sensor. A gas feeder (1) for feeding the reaction gas to the air pipe (46) of the heat detector;
A gas detector (2) for detecting the reaction gas;
Consists of
The gas feeder (1)
Reactive gas supply means (17);
A gas supply pipe (12) for sending the reaction gas supplied from the reaction gas supply means (17) to the air pipe (46) of the differential distributed heat detector;
A pressure gauge (15) for measuring the gas pressure of the air pipe (46);
With
An inspection set that detects the leak location of the air pipe of a differential distributed heat sensor. A gas feeder (1) for feeding the reaction gas to the air pipe (46) of the heat detector;
A gas detector (2) for detecting the reaction gas;
Consists of
The gas feeder (1)
Reactive gas supply means (17);
A gas injection pipe (10) into which reaction gas is injected from the reaction gas supply means (17);
An outward pipe (12) and a return pipe (13) each having a valve (120, 130) connected to the gas injection pipe (10);
The air pipe forward path part (461) disconnected from the heat sensor is connected to the forward path pipe (12), and the air pipe return path part (462) disconnected from the heat sensor is connected to the return pipe (13). A pipe connecting means (14) for
A pressure gauge (15) for measuring the gas pressure in the return pipe (13);
With
An inspection set that detects the leak location of the air pipe of a differential distributed heat sensor. An air injection pump (3) for injecting air into the air pipe (46) and replacing the reaction gas in the air pipe (46) with air;
The test | inspection set which detects the leak location of the air pipe of the differential type | mold distributed heat sensor as described in any one of Claim 2 or 3.

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