JPH08101101A - Device for automatic sampling of liquid/gas sample from pipe - Google Patents

Abstract

PURPOSE: To automatically sample both liquid sample and gas sample in a pipe such as a sewer pipe. CONSTITUTION: An outer cylinder 21 is fixed to a hole 12 opened in the upper part of a sewer pipe 11, and therein an inner cylinder 23 capable of ascending and descending is installed, which is positioned above the pipe 11 in the highest position and whose tip 28 is positioned below the pipe 11 in the lowest position. A sampling chamber equipped internally with a liquid sample tray is installed in the upper part of the outer cylinder 21. Liquid sensors 29, 30 are furnished in the tip end part of the inner cylinder 23, and the upper part is connected with the bottom of the tray through a tube 24 and a pump.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus capable of automatically collecting both a liquid sample flowing through a sewer pipe, a drainage pipe of a factory, etc. and a gas sample existing above it.

[0002]

2. Description of the Related Art From the viewpoint of environmental protection, various regulations have been tightened for domestic wastewater and factory wastewater, and periodical analysis of wastewater flowing through these is required. However, in the past, the interval between such periodic analyzes was relatively long, about one week. Therefore, a sampling bottle could be pulled down from a vertical hole with a manhole and pumped up. Wastewater was sampled manually after entering the facility.

[0003]

The regulations on wastewater will become more and more strict in the future, and in the future, it may be necessary to perform sampling several times a day or continuously. In such a case, it is practically impossible for humans to sample many sewer pipes and drain pipes. In addition, some effluents generate gas when they come into contact with other effluent components, so the sewage pipes may be filled with offensive odorous gases and toxic gases, and human sampling Can be dangerous. Further, in this case, if the generated gas is flammable, an accident may occur, so it is necessary to analyze not only the wastewater but also the gas.

The present invention has been made to solve such a problem, and an object of the present invention is to automatically sample both a liquid sample and a gas sample in a pipe such as a sewer pipe. To provide a device that can.

[0005]

SUMMARY OF THE INVENTION An automatic liquid / gas sampler for pipes according to the present invention, which is made to solve the above-mentioned problems, automatically detects a liquid sample flowing in a lower part of a pipe and a gas sample existing above the liquid sample. It is a device that collects electricity, and a) is an outer cylinder fixed in a hole provided in the upper part of the pipe wall, and b) can be raised and lowered in the outer cylinder, and the tip is the upper part of the pipe in the most raised state. The inner cylinder, which is located above the inner cylinder and whose tip is located near the inner wall of the lower part of the pipe in the most lowered state, c) the liquid sensor provided at the tip of the inner cylinder, and d) the inner cylinder that raises and lowers the inner cylinder. An elevating mechanism, e) a sampling chamber provided at the upper end of the outer cylinder and having a sample dish inside for receiving a liquid sample, and f) a pump provided in a path connecting the inner cylinder and the sample dish. It is characterized by having.

[0006]

[Function] Normally, the inner cylinder is placed in the most raised position.
When collecting a gas sample in a pipe, lower the inner cylinder by the inner cylinder elevating mechanism and stop the inner cylinder at the position where the tip is below the upper part of the tube and the liquid sensor at the tip detects liquid. Then, the pump introduces the gas sample in the upper part of the tube into the sampling chamber. After that, the gas sample in the sampling chamber can be analyzed by introducing the gas sample in the sampling chamber to a gas analyzer with an appropriate connecting pipe or an autosampler.

When collecting the liquid sample in the tube, the inner cylinder is lowered to the position where the liquid sensor at the tip detects the liquid by the inner cylinder lifting mechanism, the inner cylinder is stopped there, and the liquid sample is pumped to the sample dish. Suction. After that, similarly, the liquid sample in the sample dish can be analyzed by introducing the liquid sample in the sample dish to the liquid analyzer by using a suitable connecting pipe or an autosampler.

In particular, after the analysis of the liquid sample is completed, there is a problem that the sample adheres to the path connecting the inner cylinder and the sample dish and mixes into the sample to be analyzed next time (carry over). Therefore, in the automatic sample collecting apparatus according to the present invention, after the liquid sample is collected, a cleaning liquid such as water is put in the sample dish, and the cleaning liquid is discharged from the tip through the inner cylinder by the pump, thereby providing a path between them. Can be washed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The automatic liquid / gas sampling device 20 of this embodiment is shown in FIG.
As shown in, in order to automatically collect both these samples in order to analyze the wastewater flowing in the sewer pipe 11 and the gas present in the upper part of the sewer pipe 11 which is buried in the underground 66. Used for. FIG. 1 shows the details of the lower part where the sampling device 20 is attached to the sewer pipe 11, and FIG. 2 shows the details of the upper part near the ground.

As shown in FIG. 1, the lower part of the sampling device 20 has a double structure of an outer cylinder 21 and an inner cylinder 23, and the outer cylinder 21 is fixed to a hole 12 provided in the upper part of the sewer pipe 11. To be done. A rubber film 31 having appropriate cuts 31a is provided at the tip of the outer cylinder 21 (FIG. 3A), and a motor housing 32 is provided at the side. In this embodiment, another outer cylinder 22 is fixed to the upper part of the outer cylinder 21, and the large diameter portion 41 and the like shown in FIG. 2 are provided on this upper part, but of course both outer cylinders 21 and 22 may be integrated. Good.

A filter 28 is fixed to the tip of the inner cylinder 23, and two ring electrodes 29 and 30 are fixed immediately above the filter 28 with a short interval. Both ring electrodes 29, 30
Functions as the liquid sensor of the present invention. A rack 26 is fixed to the side surface of the inner cylinder 23, and the rack 26 is meshed with a pinion 27 that is rotatably driven by a lift motor 33 in a motor housing 32. A tube 24 made of Teflon (trademark) or vinyl is fixed to the upper part of the inner cylinder 23, and the tube 24 is a pump 43 described later.
And the sample pan 45. A control circuit 34 including a motor driver circuit and a water sensor circuit is also provided in the motor housing portion 32. The control circuit 34 is connected to both ring electrodes 29, 30 and the lifting motor 33, and is externally connected. Power is supplied from the power line 36 from the optical fiber cable 35 for control signal / data transmission.
Receives a control signal or the like from an external controller (not shown). Since the ring electrodes 29, 30 move up and down together with the inner cylinder 23, the control circuit 34 and both ring electrodes 29, 3
The electric wire connecting 0 and 0 is made expandable by winding it in a coil shape as shown in FIG.

As shown in FIG. 2, a large diameter portion 41 is provided in the upper portion of the outer cylinder 22, and a sampling chamber 44 is provided in the upper portion thereof.
Is provided. In the large-diameter portion 41, the tube 24 is wound in a coil shape so as to follow up and down of the inner cylinder 23 connected to the lower portion. A pump (P) 43 is provided above the coiled tube 24,
After that, the tip of the tube 24 is connected to the bottom of a liquid sample dish 45 provided in the sampling chamber 44. The pump 43 may be of various types other than a squeezing roller type which is a roller from the outside of the tube 24.

A drain pipe 46 extends downward from the floor of the sampling chamber 44 in order to discharge the overflowing liquid sample from the liquid sample pan 45. Sampling room 44
A septum (rubber film) 51 is stretched over the upper part of the gas sampling pipe 48, the liquid sampling pipe 49, and the cleaning liquid pipe 50 (FIG. 3).
(B)).

As shown in FIG. 6A, the gas sampling tube 48 is connected to a gas analyzer 64 via a gas sampler 63.
Connected to the liquid sampling pipe 49 and the cleaning liquid pipe 50.
Is connected to a liquid analyzer 62 via a liquid sampler 61. When the large-diameter portion 41, the samplers 61 and 63, and the analyzers 62 and 64 are arranged on the ground, it is desirable to provide a protective cover 65. In addition, as shown in FIG. 7, these may be buried underground. In this case, it is desirable to provide a strong lid 70 on top of these to protect them from loads from the ground.

Automatic liquid / gas sampling device 2 of this embodiment
The procedure of sampling gas and wastewater in the sewer pipe 11 according to No. 0 will be described with reference to the flowcharts of FIGS. 4 and 5.
First, the elevating motor 33 is activated to start lowering the inner cylinder 23 (step S1). Then, after a predetermined time has elapsed (step S2), the lift motor 33 is stopped (step S3). For a predetermined time here, the filter 28 portion at the tip of the inner cylinder 23 is at a predetermined standby position (step S which will be described later).
21 (see S22) from the bottom of the outer cylinder 21 through the rubber film 31 to reach the upper portion 14 of the sewer pipe 11 in advance. At this position, the pump 43 is driven for a predetermined time to suck the gas existing in the upper portion 14 of the sewer pipe 11 from the tip of the inner cylinder 23 (step S4). When a predetermined time sufficient to fill the sampling chamber 44 with gas has passed (step S5), the pump 43 is stopped (step S6), and the gas in the sampling chamber 44 is sucked by the gas sampling pipe 48 for analysis. (Step S
7). After the analysis is completed, air is supplied from the gas sampler 63 to the sampling chamber 44 through the gas sampling pipe 48, and the sampling gas is discharged (step S).
8).

Next, the waste water is analyzed. Step S1
Similarly to the above, the elevating motor 33 is activated to further lower the inner cylinder 23 (step S9), and when the tip of the inner cylinder 23 is immersed in the drainage 13 and conduction is generated between both ring electrodes 29, 30 ( (Step S10) The lifting motor 33 is stopped (step S11). Then, the pump 43 is driven to suck the drainage 13 (step S12). The drainage 13 is the liquid sample dish 4
When a predetermined time required to satisfy 5 is elapsed (step S13), the pump 43 is stopped (step S14), and the waste water of the liquid sample dish 45 is supplied to the liquid analyzer 62 by the liquid sampling tube 49 for analysis. (Step S1
5). This completes the analysis of gas and wastewater.

Finally, the inside of the tube 24 and the inner cylinder 23 is cleaned. First, the lifting cylinder 33 drives the inner cylinder 2
3 is raised (step S16), and both ring electrodes 29,
When there is no continuity between 30 (step S17), the lifting motor 33 is stopped (step S18). At this point, the tip of the inner cylinder 23 is present in the upper portion 14 of the sewer pipe 11. At this position, the drainage 13 in the liquid sample pan 45 is discharged from the tip of the inner cylinder 23 by the pump 43, and the cleaning liquid is supplied from the liquid sampler 61 through the cleaning liquid pipe 50 to the liquid sample pan 45. Inner cylinder 2
The inside of 3 is washed (step S19). After the cleaning is completed, the elevating motor 33 is activated to further raise the inner cylinder 23 (step S20), and when the tip of the inner cylinder 23 reaches a predetermined standby position on the rubber film 31 (step S21).
The lifting motor 33 is stopped (step S22). Inner cylinder 2
The fact that the tip of 3 has reached the standby position means that the lifting motor 33
The detection may be performed using a counter incorporated in the driver circuit (inside the control circuit 34), or a sensor may be provided at the lower end of the outer cylinder 21 to perform detection.

[0018]

With the automatic liquid / gas sampling device according to the present invention, not only the liquid sample in the tube but also the gas sample can be automatically sucked into the upper sampling chamber. Therefore, not only water pollution but also gas accident can be monitored. Since it is not necessary for humans to intervene in sampling, frequent sampling can be easily performed.

[Brief description of drawings]

FIG. 1 is a detailed cross-sectional view of a lower portion of an automatic liquid / gas sampling device for sewer pipes according to an embodiment of the present invention.

FIG. 2 is a detailed cross-sectional view of the upper portion of the automatic sampling device according to the embodiment.

FIG. 3 is a bottom view (a) of the lower end of the outer cylinder and a plan view (b) of the upper part of the sampling chamber.

FIG. 4 is a first half part of a flow chart of a movement when the automatic sampling device of the embodiment collects gas and drainage in a sewer pipe.

FIG. 5 is the latter half of the above flowchart.

FIG. 6 is a cross-sectional view when the upper part of the automatic sampling device according to the embodiment is arranged so as to appear on the ground.

FIG. 7 is a cross-sectional view of a case where the automatic sampling device according to the embodiment is arranged so as to be entirely buried underground.

[Explanation of symbols]

11 ... Sewer pipe 12 ... Hole in the upper part of the sewer pipe 20 ... Automatic liquid / gas sampling device 21, 22 ... Outer cylinder 23 ... Inner cylinder 24 ... Tube 28 ... Filter 29, 30 ... Ring electrode (liquid sensor) 31 ... Rubber film 33 ... Lifting motor 34 ... Control circuit 35 ... Optical fiber cable 36 ... Power line 43 ... Pump 44 ... Sampling chamber 45 ... Liquid sample dish 46 ... Drain pipe 48 ... Gas sampling pipe 49 ... Liquid sampling pipe 50 ... Wash liquid pipe 61 ... Liquid sampler 62 ... Liquid analyzer 63 ... Gas sampler 64 ... Gas analyzer 65 ... Protective cover 70 ... Lid

Claims (1)

[Claims] 1. A device for automatically collecting a liquid sample flowing downward in a pipe and a gas sample existing above the pipe, comprising: a) an outer cylinder fixed to a hole provided in an upper portion of a pipe wall, b) An inner cylinder that can be moved up and down in the outer cylinder, with the tip located above the upper part of the pipe in the most raised state, and the tip located near the inner wall of the lower part of the pipe in the most lowered state, c ) A liquid sensor provided at the tip of the inner cylinder, d) an inner cylinder elevating mechanism that elevates and lowers the inner cylinder, and e) a sampling chamber that is provided at the upper end of the outer cylinder and has a sample dish inside for receiving a liquid sample F) An automatic liquid / gas sampling device for pipes, comprising: a pump provided in a path connecting the inner cylinder and the sample dish.