JPH0293392A - Dust radiation monitor apparatus - Google Patents

Abstract

PURPOSE:To certainly judge the clogging of filter paper by particles or the closure of sampling piping by comparing one of or both of the measured values of a flowmeter and a pressure gauge with a preset value. CONSTITUTION:When a suction pump 10 is driven by the pump control part of a dust radiation monitor apparatus, air containing dust passes through the filter paper 4 of a dust collection part 2 from a sampling gas inlet (a) and further passes through a flow control valve 8 and a flowmeter 9 to be discharged from a sampling gas outlet (b) by the suction pump 10. The pump control part 21 takes in the measured flow rate from the flowmeter 9 continuously or at a cycle faster than a filter paper replacing cycle to compare the same with the set flow rate of a flow rate setting part 22. When the measured flow rate is smaller than the set flow rate, an abnormal signal is sent out to set unused filter paper 4 to the dust collection part 2 and, thereafter, a cause is judged while the state of the measured flow rate is observed. By this method, the clopping of filter paper can be certainly judged from the closure of sampling piping.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an improvement of a dust radiation monitoring device having a dust sampler dust collection control function. (Prior Art) A conventional device of this type has a configuration as shown in FIG. That is, a dust collection section 2 is provided at a predetermined location of the sampling pipe 1, and unused filter paper 4 from the filter paper supply section 3 is set in the dust collection section 2 and wound up on the filter paper winding section 5. There is. In this state, when air containing particles enters from the sampling gas population a, the particles in the air are collected by the filter paper 4 when passing through the collection mal. After that, when a preset time in the time setting section 6 has elapsed, a drive signal is output from the dust collection control section 7 to rotate the filter paper winding section 5, so that the filter paper 4 in the dust collection section 2 is replaced with unused filter paper. can be eaten by. On the other hand, the air that has passed through the filter paper 4 in the dust collecting section 2 passes through a flow rate control valve 8, a flow meter 9, and a suction pump 10, and is released from the sampling gas outlet. In the figure, 11 is a pressure gauge, 12 is a pressure setting part for setting a desired pressure, and 13 is a suction pump 10 for 3.1 seconds while comparing the detected pressure from the pressure gauge 11 and the set pressure of the pressure setting part 12. 14 is a pressure regulating valve, and 15 is a filter. By the way, in the dust radiation monitor device as described above,
If the filter paper 4 is clogged with particles collected during the particle collection time, or if the inside of the sampling pipe 1 connecting the inlet a and the outlet a is blocked, the measured value of the flow meter 9 will drop or the pressure will drop. The indicated value of the total 11 indicates an abnormality, but if this state is left untreated, the measurement error of the radioactivity concentration of particles will increase or the suction pump 10 will be operated under an overload. Therefore, as a means to prevent the above-mentioned problems, the /l11 fixed value of the flow meter 9 or pressure gauge 11 is compared with a predetermined set value, and when the measured value exceeds the set value, an alarm is generated, or It is configured to stop the suction pump 1o. (Problem to be solved by the invention) However, the dust radiation monitor device '11i as described above
', an alarm is generated or the suction pump 1o is stopped based on an abnormality in the fixed value of A11, but the cause of the alarm generation or the stoppage of the suction pump 1o may be due to clogging of the filter paper or the sampling piping 1 including the valve etc. It is difficult to determine whether this is due to occlusion. The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a dust radiation monitoring device that can reliably determine whether a filter paper is clogged with particles or a sampling pipe or the like is blocked. [Structure of the Invention] (Means for Achieving the Object) In order to achieve the above object, the dust radiation monitoring device according to the present invention is a collection system in which unused filter paper is automatically loaded into a predetermined location of a sampling pipe at predetermined intervals. In a dust radiation monitoring device provided with a suction pump that sucks in and releases air containing particles into a dust part and the sampling pipe,
At least a flow meter or a pressure gauge installed in the sampling pipe located on the outlet side of the dust collecting section, and comparing the measured value of one or both of the flow meter and the pressure gauge with a predetermined set value. and a pump control unit that outputs an abnormal signal when the measured value is determined to be abnormal, and a pump control unit that sets the unused filter paper in the dust collection unit regardless of the predetermined cycle when receiving the abnormal signal from the pump control unit. A dust collection control unit,
After the unused filter paper is set by the dust collection control section, the pump control section determines whether the filter paper is clogged or the piping is blocked from the state of the measured value. In addition, another invention provides a new bypass pipe for bypassing the dust collecting section, and line valves and bypass pipes provided individually in the sampling pipe and the bypass pipe located on the inlet side of the dust collecting section. When the pump control unit determines that the valve is abnormal, the valve is opened and closed via the dust collection control unit, and then the bomb control unit determines whether the filter paper is clogged or the piping is blocked based on the state of the measured value. It is. (Function) Therefore, by taking the above measures, the pump control unit compares the measured value of the flow meter or pressure gauge with a predetermined set value, and sets the measured value to be determined to be abnormal. When the value is exceeded, an abnormal signal is sent to the dust collection control unit. Here, when the dust collection control section receives an abnormal signal, it is originally supposed to set unused filter paper in the dust collection section at predetermined intervals, but it ignores this period and sets unused filter paper in the dust collection section. do. After setting the filter paper, the pump controller
The state of the J1 constant value is observed, and when it returns to a normal state, it is determined that the filter paper is clogged, and when it does not return to a normal state, it is determined that the sampling pipe is blocked. Further, in another invention, the dust collection control section receives an abnormal signal from the pump control section, opens a bypass valve and closes a line valve, and passes air containing particles through the bypass pipe to a flowmeter or a pressure sensor. . A device that supplies power to a force meter and similarly observes the state of the measured value in the pump control unit, and when it returns to a normal state, it is determined that the filter paper is clogged, and when it does not return to a normal state, it is determined that the sampling piping is blocked. It is. (Example) Hereinafter, an example of the apparatus of the present invention will be described with reference to FIG. In this figure, parts that are the same as those in FIG. 4 are given the same reference numerals, and a detailed explanation thereof will be omitted. Particularly different parts will be explained below. That is, this device introduces the detected flow rate of the flow meter 9 that measures the flow rate in the sampling pipe 1 into the pump control section 21 . This pump control section 2
1 compares the detected flow rate and the set flow rate of the flow rate setting section 22,
When the detected flow rate is smaller than the set flow rate, an abnormality signal is sent to the dust collection control section 23. When this dust collection control section 23 receives an abnormal signal from the pump control section 21, the time setting section 6
Regardless of whether or not the set time has elapsed, the dust collecting section 2 is closed, the filter paper winding section 5 is driven, and the unused filter paper 4 is set into the dust collecting section 2. Next, the operation of the apparatus configured as above will be explained. First, when the pump control unit 21 drives the suction pump 10 , air containing particles passes from the sampling gas population a through the filter paper 4 of the dust collection unit 2 , passes through the flow rate control valve 8 and the flow meter 9 , and is then pumped through the suction pump 10 . The sampling gas is released from the outlet. During such a dust collecting operation, the pump control unit 21 controls the flow meter 9 to
-1 constant flow rate is taken in, and this measured flow rate and the flow rate setting section 22
Compare with the set flow rate. As a result of this comparison, M1
When the constant flow rate becomes smaller than the set flow rate, an abnormality signal is sent from the pump control section 21 to the dust collection control section 23. Here, when the dust collection control section 23 receives an abnormal signal, the time setting section 6
Even before the filter paper replacement cycle has elapsed, a drive signal is output to rotate the filter paper winding part 5 and set the unused filter paper 4 in the dust collection part 2. As a result, a new filter paper 4 is set in the dust collection section 2, so if the filter paper white body before replacement is clogged, the measured flow rate from the flowmeter 9 will increase after replacing it with a new filter paper. Become. Therefore, after sending out the abnormality signal, the pump control unit 21 determines the state of the flow rate measured by the flow meter 9, and resets the abnormality signal when the M1 constant flow rate increases. If the measured flow rate does not increase after a predetermined period of time has passed after replacing the filter paper, the pump control unit 21 determines that the sampling pipe or the like is blocked, and stops the suction pump 10. Therefore, according to the configuration of the embodiment described below, the pump control unit 2 compares the measured flow rate with the set flow rate, and when the M1 constant flow rate is smaller than the set flow rate, sends an abnormal signal and performs dust collection. After setting an unused filter paper 4 in section 2, the cause is determined while checking the measured flow rate, so it is possible to reliably determine whether the filter paper is clogged or the sampling pipe is blocked. Since the suction pump 10 is immediately stopped in the event of blockage, dust sampling can be performed efficiently, and appropriate repairs can be made promptly based on the identification of the cause. In the above embodiment, the ul constant flow rate of the Etm meter 9 was determined, but this flow is compared with the set pressure of the pressure setting section 24 using the constant pressure 711j of the pressure gauge 11 instead of the meter 9. Good too. In addition, as shown in FIG. 3, a bypass pipe 31 that bypasses the dust collection section 2 is provided in the sampling pipe 1, and line valves 32 and bypass pipes are installed on the inlet side of the collection section 2 and the bypass pipe 31 individually. This configuration includes a valve 33. With this configuration, the pump control unit 21 compares the measured flow rate of the flow meter 9 and the set flow rate of the flow rate setting unit 22, and when it is determined that the measured flow rate is smaller than the set flow rate, the dust collection control unit An abnormal signal is sent to 23. When this dust collection control section 23 receives an abnormal signal, it opens the bypass valve 33 and closes the line valve 32, and then controls the filter paper winding section 5 to leave the dust collection section 2 unused. Set filter paper 4. As a result, the air that has entered the sampling pipe 1 flows through the flow meter 9 via the bypass pipe 31, so that if the filter paper is clogged, the IIJ1 constant flow rate of the flow meter 9 will increase. Here, if the measured flow rate does not increase, it is determined that a pipe or the like is blocked. Also, after replacing the unused filter paper, if the line valve 32 is opened and the bypass valve 33 is closed,
Air flows again through the original route, but if the flow m measured by the flowmeter 9 increases at this time as well, it is determined that the filter paper is clogged. The reason for providing the bypass pipe 31 is not only to determine whether the filter paper is clogged or the sampling pipe is clogged as described above, but also to suction air from multiple points using one suction pump 10. Therefore, if the sampling pipe 1 is closed and no flow is allowed to flow during maintenance of the dust collecting section 2, there is a risk that the flow in other systems may cause abnormal conditions, so the bypass pipe 31 is provided from this point of view as well. This is effective. In addition, the present invention can be implemented with various modifications without departing from the gist thereof. [Effects of the Invention] As described above in detail, the present invention provides various effects as described below. In claim 1, it is possible to reliably determine whether the filter paper is clogged, or the sampling piping, etc. is blocked, and if the filter paper is clogged, the suction pump can be replaced with an unused filter paper without stopping. This allows the abnormality to be repaired quickly and improves the efficiency of sampling work. Next, in claim 2, in addition to providing the same effects as in claim 1, there is an advantage that, for example, when a suction pump sucks air from multiple systems, it does not affect other systems.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the dust radiation monitoring device according to the present invention, FIGS. 2 and 3 are block diagrams showing other embodiments of the device of the present invention, and FIG. FIG. 2 is a configuration diagram of a radiation monitoring device. ]...Sampling pipe, 2...Dust collection section, 4...
Filter paper, 5... Filter paper winding section, 6... Time setting section, 9.
... Flow meter, 10... Suction pump, 11... Pressure gauge, 21... Pump control section, 22... Flow rate setting section, 2
3... Dust collection control section, 24... Pressure setting section, 31...
- Bypass pipe, 32... line valve, 33... bypass valve. Applicant's agent Patent attorney Takehiko Suzue b

Claims (2)

[Claims] (1) In a dust radiation monitoring device that is equipped with a dust collecting section in which unused filter paper is automatically loaded at a predetermined period in a predetermined part of the sampling pipe, and a suction pump that sucks and releases air containing particles into the sampling pipe. , at least a flow meter or a pressure gauge installed in the sampling pipe located on the outlet side of the dust collecting section, and a measured value of one or both of the flow meter and the pressure gauge and a predetermined set value. a pump control unit that outputs an abnormal signal when the measured value is judged to be abnormal after comparison; and a pump control unit that sets the unused filter paper in the dust collection unit regardless of the predetermined cycle when receiving the abnormal signal from the pump control unit. a dust collection control unit,
A dust radiation monitor characterized by comprising a determining means for determining whether the filter paper is clogged or the piping is blocked based on the state of the measured value in the pump controller after the unused filter paper is set by the dust collection controller. Device. (2) In a dust radiation monitoring device that is equipped with a dust collection section in which unused filter paper is automatically loaded at a predetermined period at a predetermined point in the sampling pipe, and a suction pump that sucks and releases air containing particles into the sampling pipe. , a bypass pipe that bypasses the dust collection section, a line valve and a bypass valve that are individually provided in the sampling pipe and the bypass pipe located on the inlet side of the dust collection section, respectively;
At least a flow meter or a pressure gauge installed in the sampling pipe located on the outlet side of the dust collecting section, and comparing the measured value of one or both of the flow meter and the pressure gauge with a predetermined set value. and a pump control unit that outputs an abnormal signal when the measured value is determined to be abnormal, and a normally closed bypass valve that opens the normally closed bypass valve regardless of the predetermined cycle when receiving the abnormal signal from the pump control unit. a dust collection control unit that sets a line valve to close, and a determination unit that determines whether the filter paper is clogged or the piping is blocked from the state of the measured value in the pump control unit after the dust collection control unit controls the valve. A dust radiation monitor device comprising: