JPS6115512Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a deterioration level detection device for a filter for capturing graphite dust discharged from a graphite crucible heating device.

Deterioration of the graphite dust filter mentioned above leads to early deterioration of the detector in the downstream system, and further causes failure of equipment such as solenoid valves, making it difficult to accurately grasp the degree of deterioration of the filter. It is important not to miss the time to replace the filter.

Conventionally, a white graphite dust filter was filled in the middle of the gas exhaust pipe from the graphite crucible heating device, and a see-through window was provided on the pipe wall facing the filter to visually check the degree of deterioration of the graphite dust filter. However, due to individual differences, this may result in an uneconomical situation in which it is necessary to replace the filter even though it still has sufficient function, or a situation in which a fatal delay in filter replacement occurs. There was a drawback that it was easy to do.

The present invention was developed in view of the above-mentioned circumstances, and the purpose is to make it possible to accurately grasp the degree of deterioration of graphite dust filters without individual differences through simple improvements. shall be.

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, 1 is a graphite crucible heating device, which houses a metal sample for analysis in a graphite crucible 4 placed between upper and lower electrodes 2 and 3, and applies a voltage to both electrodes 2 and 3 to generate a large current. The metal sample is melted by flowing the metal sample, and the gas components generated in the sample are introduced into the analyzer 7 through the gas exhaust pipe 6 by the carrier gas from the flow path 5.

Next, 8 is a graphite dust filter having a light reflective property such as quartz wool filled in the middle of the gas exhaust pipe 6, and the gas exhaust pipe portion 6a filled with the filter 8 is made of glass, and the filter is placed here. A light transmitting portion A for 8 is formed.

9 is a light emitter that irradiates light to the filter 8 through the light transmission section A; 10 is a light receiver that receives reflected light from the filter 8;
is for electrically extracting the change in the amount of received light and inputting it to the filter deterioration indicating device 11.
The deterioration indicating device 11 is equipped with a meter 12 that displays the change in the amount of received light in an analog manner, and the scale of the meter 12 has a filter set in advance based on the experience of experts and the results of experiments. A limit scale a indicating the degree of deterioration requiring 8 replacements is attached.

According to the above configuration, as the graphite dust captured by the filter 8 absorbs the irradiated light from the light emitter 9, the amount of light received by the light receiver 10 is gradually attenuated. Since the attenuation status of the filter 8, that is, the deterioration status of the filter 8, is displayed sequentially on the deterioration indicating device 11, the filter 8
Based on the fact that the meter pointer has reached the limit scale a, as well as the degree of deterioration of the filter 8.
It is possible to accurately ascertain, regardless of individual differences, that it is time to replace the product.

In addition, another set of deterioration degree detection devices (which can also be used as the light emitting device 9) is provided on the upstream side, and based on the status of filter deterioration caused by this, it is possible to detect when the time for replacing the filter 8 will soon be reached. It is also good to configure it so that it can be predicted.

Further, the change in the amount of light received may be displayed digitally, or based on the change in the amount of light received when it is time to replace the filter 8, an external device such as sounding a buzzer or lighting a lamp may be used. In the present invention, these are collectively referred to as the deterioration indicating device 11.

Further, in the embodiment, the gas exhaust pipe portion 6a was made of glass to form the light transmitting portion A, but the gas exhaust pipe portion 6a
It is also possible to make the tube opaque and to form the necessary minimum tube wall portion into a light transmitting portion made of glass or synthetic resin.

As explained above, the graphite dust filter deterioration detection device according to the present invention uses a light-reflective graphite dust filter filled in the middle of the gas exhaust pipe connecting the graphite crucible heating device and the analyzer. ,
a light transmitting section formed in at least a portion of a tube wall facing the filter; a light emitter that irradiates light onto the filter through the transmitting section; a light receiver that receives reflected light from the filter; and the light receiver. The present invention is characterized in that it comprises a deterioration indicating device that indicates the deterioration state of the filter based on the attenuation of the amount of light received by the filter.

That is, the degree of deterioration of the filter is optically detected based on the change in the degree of light reflection of the filter as graphite dust is captured, and the deterioration state of the graphite dust filter can be easily detected. Therefore, it is possible to give instructions rationally and objectively. Therefore, it has become possible to reliably eliminate the uneconomic situations and delays in filter replacement due to observer's subjectivity and errors, which tend to occur during conventional visual checks.

[Brief explanation of the drawing]

The drawing is a configuration diagram showing an example of a deterioration degree detection device for a graphite dust filter according to the present invention. DESCRIPTION OF SYMBOLS 1... Graphite crucible heating device, 6... Gas discharge pipe, 7... Analyzer, 8... Filter for graphite dust, 9... Light emitter, 10... Light receiver, 11... Deterioration indicating device, A... ...Light transmitting part.

Claims (1)

[Scope of utility model registration request] A light-reflective graphite dust filter filled in the middle of a gas exhaust pipe connecting between a graphite crucible heating device and an analyzer, and a light-transmitting part formed on at least a part of the pipe wall facing the filter. , a light emitter that irradiates light onto the filter through the transmission portion, a light receiver that receives reflected light from the filter, and a deterioration that indicates the state of deterioration of the filter based on attenuation of the amount of light received by the light receiver. A graphite dust filter deterioration detection device consisting of an indicating device.