JP3017667B2 - Dust collection device for radiation monitoring car - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust collecting device mounted on a radiation monitoring car for measuring environmental radiation.

[0002]

2. Description of the Related Art A radiation monitoring car is a mobile measuring car equipped with a dust collecting device for measuring the concentration of radioactive substances contained in the air. According to this radiation monitoring car, it is possible to move to each point around a radioactive material handling facility such as a nuclear power plant or a nuclear fuel facility and collect dust for a certain period of time. Dust collection is generally performed by adsorption on filter paper.After collecting the dust, the filter paper is removed from the device and set on a radiation detection device, or radiation is detected simultaneously with collection by a radiation detector placed opposite to the filter paper. , The concentration of the radioactive substance is measured.

FIG. 2 shows a schematic configuration of a dust collecting device mounted on a conventional radiation monitoring car. In FIG. 2, air sucked from an air inlet 10 passes through a filter paper 14 in a sampling head 12, and at that time, dust containing a radioactive substance adheres to the filter paper. The sampling head 12 is provided, for example, above a radiation monitoring car. The flow meter 16 includes a valve for adjusting the flow rate, and measures the air flow rate.
8 measures the degree of vacuum at the front stage of the air pump 20. The air pump 20 functions as an intake drive source and obtains its electric power from the generator 22. The air via the air pump is discharged from the exhaust port 24 to the outside.

[0004]

In the above-mentioned conventional apparatus, the generator 22 and the pump 20 are very heavy and large. Therefore, there is a problem that the weight of the radiation monitoring car is increased and a large installation space is required.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to reduce the weight of a dust collecting device in a radiation monitoring car and to reduce the size of the dust collecting device.

[0006]

To achieve the above object, the present invention relates to an apparatus for collecting dust for detecting a radioactive substance, which is mounted on a radiation monitoring car. And a sampling unit for collecting dust in the air, wherein the engine is used as an intake drive source for collecting dust.

[0007] According to the above configuration, the engine of the radiation monitoring car can be used as an air suction drive source of the dust collecting device, so that it is not necessary to separately provide an air pump and a generator as in the related art. In other words, the present invention is not limited to using an engine that originally assumes intake air as a drive source of a vehicle, but also uses an engine as an air suction source for collecting dust.

In the conventional air pump, the suction flow rate periodically fluctuates (pulsates) due to its structure. On the other hand, in the present invention, the suction flow rate fluctuates due to the use of the engine. Periodic fluctuation of the flow rate can be suppressed.

In a preferred embodiment of the present invention, a filter paper for adsorbing dust is incorporated in the sampling section, and a radiation detector facing the filter paper is incorporated as necessary.

In a preferred embodiment of the present invention, the apparatus includes a flow rate adjusting means for adjusting a flow rate of the air flowing through the sampling section.

In a preferred embodiment of the present invention, an auxiliary air intake path is formed in parallel with the sampling section, and air passing through the sampling section and air from the auxiliary air intake path are introduced into the engine. You. Then, a flow rate adjusting means for adjusting each flow rate of the sampling section and the auxiliary air intake path is provided. In that case, the flow rate adjusting means adjusts the flow rate according to the number of revolutions of the engine.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a preferred embodiment of the present invention, and FIG. 1 is an overall configuration diagram thereof. The dust collecting apparatus according to the present invention is mounted on a radiation monitoring car, and uses an engine 30 of the radiation monitoring car as an intake driving source for air collection.

In FIG. 1, an engine 30 of a radiation monitoring car is, for example, a multi-cylinder gasoline engine or a diesel engine, and includes an air filter 32 and a carburetor 3 provided on the intake side thereof.
A sampling unit, which is a main component of the dust collection device, is disposed at a stage preceding the intake air intake side 4 (intake side). That is, this sampling unit is used by using a mechanism including an existing engine as it is and setting it on the intake side of the air filter 32. Of course, the air filter 32 can be removed as needed. The device 34 such as a carburetor includes a fuel injection device, for example. This depends on the type of engine.

In a sampling unit provided before the air filter 32, air is taken in from the intake port 10, and the air is supplied to the sampling head 1 as in the conventional case.
2 and dust is adsorbed on the filter paper 14. The air that has passed through the filter paper 14 is introduced into the air filter 32 via a flow meter 36 with a flow rate adjusting function.

On the other hand, in front of the air filter 32, an auxiliary air intake path 37 is formed in parallel with the suction path passing through the sampling head 12, that is, air is taken in from the intake port 37A of the auxiliary air intake path 37. The air is filtered through the air filter 32 through the flow rate adjusting valve 38.
Has been introduced. The auxiliary air intake passage 37 is provided for supplementarily introducing air when the amount of air flowing through the sampling head 12 is insufficient for intake, and a necessary and sufficient flow from the sampling head 12 is supplied to the air filter 32. In such a case, it is not necessary to provide such an auxiliary air intake passage 37.

The flow meter 36 with a flow rate adjusting function includes a valve which is electrically controlled in the inside thereof, and the flow rate passing therethrough is adjusted by a signal 100 output from the flow rate adjusting unit 40. Of course, the flow rate detected by the flow meter 36 is sent to the flow rate adjusting unit 40. The flow control unit 40 controls the valve 38 described above, and the signal 1
01 is output. The vacuum gauge 18 is connected between the flow meter 36 having a flow rate adjusting function and the air filter 32, and an output signal thereof is sent to the flow rate adjusting unit 40. The flow rate adjustment unit 40 receives a rotation speed signal 102 indicating the rotation speed of the engine 30, and the flow adjustment unit 40 of the present embodiment adjusts the flow rate according to the engine rotation speed. Of course, when dust collection is always performed in the steady idling state of the engine, it is not always necessary to adjust the flow rate according to such a rotational speed. That is, normally, dust collection is performed with the radiation monitoring car stopped at a certain point, and in such a case, it is not necessary to control the flow rate according to the rotation speed.
However, the rotation speed of the engine 30 fluctuates depending on whether the air conditioner in the radiation monitoring car is operating, and the air flow required by the engine 30 may fluctuate. The part 40 includes a flow meter 36 with a flow rate adjusting function and a valve 38
Is adjusted appropriately to secure an appropriate flow rate.

According to the configuration shown in FIG. 1, it is not necessary to provide an extremely large and heavy generator or air pump as in the prior art, and the dust can be collected using the existing engine 30 as it is. As a result, there is an advantage that the weight of the radiation monitoring car can be reduced and the shape of the dust collecting device can be reduced.

The intake port 10 and the intake port 37 shown in FIG.
A is formed on the upper part of the radiation monitoring car, for example.
On the other hand, a conventional muffler is used as it is as the exhaust port 30A.

In the embodiment shown in FIG. 1, only the filter paper 14 is arranged in the sampling head 12, but a radiation detector opposed to the filter paper 14 is built in the sampling head 12, and the filter paper 14 is not removed. It is also possible to measure the concentration of radioactive substances. As the radiation detector in that case, for example, a scintillator detector or a semiconductor detector can be used.

[0021]

As described above, according to the present invention, the weight of the dust collecting device in the radiation monitoring car can be reduced, and the size of the dust collecting device can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a dust collection device according to the present invention.

FIG. 2 is a diagram illustrating an entire configuration of a conventional dust collection device.

[Explanation of symbols]

12 sampling head, 14 filter paper, 30 engine, 36 flow meter with flow control function, 37 auxiliary air intake path, 40 flow control unit.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-51377 (JP, A) JP-A-4-29086 (JP, A) JP-A-51-16084 (JP, A) 140434 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G01T 1/167 G01T 7/04

Claims (7)

(57) [Claims] 1. An apparatus mounted on a radiation monitoring car and collecting dust for detecting radioactive substances, comprising: a sampling unit disposed on an intake side of an engine of the radiation monitoring car and collecting dust in air. A dust collection device for a radiation monitoring car, wherein the engine is used as an intake drive source for dust collection. 2. The dust collection device for a radiation monitoring car according to claim 1, wherein the sampling unit includes a filter paper for adsorbing dust. 3. The dust collection device for a radiation monitoring car according to claim 2, wherein the sampling unit includes a radiation detector facing the filter paper. 4. The dust collection device for a radiation monitoring car according to claim 1, further comprising a flow rate adjusting means for adjusting a flow rate of the air flowing through the sampling unit. 5. The apparatus according to claim 1, wherein an auxiliary air intake path is formed in parallel with the sampling section, and air passing through the sampling section and air from the auxiliary air intake path are introduced into the engine. A dust collection device for a radiation monitoring car, characterized in that: 6. The dust collecting apparatus for a radiation monitoring car according to claim 5, further comprising a flow rate adjusting means for adjusting respective flow rates of the sampling section and the auxiliary air intake path. 7. A dust collecting apparatus for a radiation monitoring car according to claim 1, wherein said flow rate adjusting means adjusts a flow rate according to a rotation speed of said engine.