JPS6033386Y2 - Water sampling device - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is particularly applicable to water sampling devices used for collecting sample water from rivers, sewage, etc. for water quality testing, for example.
This invention relates to a water sampling device that is capable of pumping water to a high level by utilizing the pressure difference caused by reduced pressure.

[Conventional technology]

In order to be able to pump water at a high height above atmospheric pressure by utilizing the pressure difference caused by decompression, one end of the water pumping hose is placed in the water at the water sampling point, and the other end of the water pumping hose is connected to a closed measuring chamber. Another closed type water pump is installed in the upper and lower middle position of the pump, and water is first pumped from the water sampling point by reducing the pressure in the pumping cell, and then the pumping cell is opened to the atmosphere, and the pressure in the measuring cell is reduced. A water sampling device configured to pump water from a pumping cell to a measuring cell is already known from Japanese Patent Publication No. 38-1728.

[Problem that the invention attempts to solve]

When a water sampling device such as the one described above is installed permanently for a long period of time to periodically collect sample water from highly polluted rivers or sewage, a pumping hose, especially one located below the pumping chamber and one end underwater in the sewage, etc. Dirt may accumulate on the inner surface of the lower pumping hose, making it impossible to collect water.

The present invention uses a compressor as a pressure reducing means for the pumping chamber and measuring chamber, and the discharge side of the compressor is used for cleaning the air of the pumping hose, thereby preventing the accumulation of dirt on the inner surface of the pumping hose. The purpose of this project is to provide a water sampling device with a

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention has a closed measuring chamber equipped with a tube with a pinch valve at the bottom for supplying sample water to the water sampler, and a water pumping hose with one end located underwater at the water sampling point. The other end of the pumping hose is connected to the upper and lower intermediate positions of the pumping hose, and a closed pumping tank equipped with a tube with a pinch valve for draining excess water is installed at the bottom, so that the first pumping hose on the lower side connects to the second pumping hose on the upper side. A flow path switching device is installed in a position higher than the pumping hose so that the pumping water is opened inward, and a flow path switching device is installed to connect the discharge side and suction side of the compressor to a position higher than the water level of the measuring chamber and pumping chamber when the water is full. A full water sensor is provided in each of the measuring cell and the water pumping cell to detect that the water has been pumped up to the water level, and the flow path switching device and the pinch valve are connected based on the detection results of these full water sensors. A controller is provided to control the water from the sampling point to the pumping tank by reducing the pressure in the pumping tank, and based on the detection result of the full water sensor of the pumping tank, the pumping tank is released to the atmosphere and the pressure in the measuring tank is reduced. The water is pumped from the pumping tank to the weighing tank, and based on the detection result of the full water sensor in the weighing tank, the pumping to the weighing tank is stopped, the pinch valve is opened to drain excess water, and the sample water in the weighing tank is first pumped into the weighing tank. The first water pumping hose is configured to be backwashed with air by supplying water to a water sampler and pressurizing the water pumping tank with the pinch valve closed.

[Effect]

According to the above configuration, each time water is sampled, the pumping hose, especially the first pumping hose located between the pumping point and the water sampling point, which is the part of the hose that is most likely to become dirty, is cleaned with air discharged from the compressor. Ru.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 shows an outline of a water sampling device according to the present invention.

Reference numeral 7 is a closed type metering device equipped with a tube 13 with a pinch valve 9 for supplying sample water to the water sampler 10 at the bottom.

A is a pumping hose consisting of a first pumping hose 1 and a second pumping hose 8, one end of which (the lower end of the first pumping hose 1) is located underwater at a water sampling point 12 such as a river or sewage,
The other end (the upper end γ of the second pumping hose 8 is connected to the measuring box 7).

2 is a closed type water pump equipped with a tube 14 at the bottom with a pinch valve 9' for draining excess water.

The pumping basin 2 is located at a vertically intermediate position of the pumping hose A, that is, between the first pumping hose 1 and the second pumping hose 8, at a position where the first pumping hose 2 is higher than the second pumping hose 8. It is installed in the pumping tank 2 in an open state.

4 is a compressor.

The water level when the measuring cell 7 and pumping cell 2 are full (
the pumping completion water level) and the compressor 4.
The discharge side and the suction side are connected to each other by an air tube 15 equipped with a flow path switching device 5.

The measuring cell 7 and the water pumping cell 2 are each provided with full-water sensors 11 and 6 that detect when the water has been pumped to the above-mentioned water level.

3 is a controller that controls the flow path switching device 5 and the pinch valves 9, 9' based on the detection results of the full water sensors 11, 6.

The full water sensors 11 and 6 may be of any type as long as they close or open electrical contacts and issue a signal when the water level rises to a predetermined position.
For example, a well-known float switch or the like may be used.

As shown in FIG. 2, the flow path switching device 5 includes six three-way air valves AV1. AV2. AV3, AV4. A
V5. It is composed of AV6.

In the figure, NO is a normally open port that cuts off communication with port C by energization;
NC is a normally closed port that communicates with port C when energized.

Broken lines indicate control wiring. Further, as shown in FIG. 1, the part of the second pumping hose 8 inserted into the measuring box 7 is provided with an opening 8a for measuring, that is, defining the amount of sample water to be supplied to the water sampler 10. There is.

FIG. 3 shows the compressor 4, air valve AVl,
AV2. AV3. AV4. AV5. AV6,
It is a time chart showing the operation of pinch valves 9 and 9'.

Next, the operation of the water sampling device having the above configuration will be explained based on FIGS. 2 to 4A.

■ Standby compressor 4, air valve AVI, AV2゜AV3
．． AV4. AV5. Power to AV6 and pinch valve 9°9' is cut off.

The pinch valves 9°9' are open, and the measuring chamber 7 and pumping chamber 2 are at atmospheric pressure.

■ When the primary pumping compressor 4, air valves AVI and AV2, and pinch valves 9 and 9' are energized, the air inside the pumping chamber 2 moves from air valve AV 4 to AV3 as shown by the arrow in Figure 4 A.
Air sucked into the compressor 4 through →AV l→ and discharged from the compressor 4, air valve AV5
→ AV2 and is discharged into the atmosphere from the port NC of air valve AV2.

When the air valve AV 2 is energized, the port NO of the air valve AV is closed, the air valve AV3 is not energized, the port NC of the air valve AV 3 is closed, and the pinch valves 9 and 9' are closed. Because there are
The weighing chamber 7 and the water pumping chamber 2 are depressurized.

Therefore, as shown by the dashed arrow in Figure 4A, the water sampling point 1
2 of water passes through the first pumping hose 1 and is pumped to the pumping tank 2.

■ When the water level in the secondary pumping tank 2 rises to a predetermined position, the full water sensor 6 detects this, and based on the detection signal, the air valve AV3. AV4 is energized.

Since the mouth NC of the air valve AV4 is opened, the pumping tank 2 is opened to the atmosphere.

As shown in Figure 4, the air in the measuring chamber 7 is sucked into the compressor 4 via air valves AV 5 → AV 3 → AV 1, and the air discharged from the compressor 4 flows from air valves AV 6 → AV 2. , air valve A
It is discharged into the atmosphere from the port NC of V2.

Therefore, as shown by the broken line arrow at the entrance of Figure 4, the pumping tank 2
of water is pumped to the metering chamber 7 through the second pumping hose 8.

■ When the water level in the measuring box 7 rises to a predetermined position, the full water sensor 11 detects this, and based on the detection signal, the air valves AVl, AV2. AV3. AV4 pinch valve 9
’ is cut off.

As a result, as shown in Figure 4, the atmosphere is removed from the air valve A.
The air sucked into the compressor 4 from the port No. 1 and discharged from the compressor 4 is passed through the air valve AV6→
It is fed into the weighing box 7 via AV2→AV5, and the weighing box 7 is pressurized.

The surplus water in the measuring chamber 7 flows out to the pumping chamber 2 through the second pumping hose 8 as shown by the dashed arrow, but the water level in the measuring chamber 7 falls to the position of the opening 8a of the second pumping hose 8. Since air flows out from this opening 8a, further outflow of water is prevented, and a predetermined amount of sample water remains in the measuring chamber 7.

On the other hand, the excess water that has flowed into the pumping tank 2 is transferred to the pinch valve 9
' is open, the water is discharged from the tube 14 to the sampling point.

■ When the power to the pinch valve 9 is cut off by the command signal from the injection controller 3, the measuring chamber 7
The sample water inside is injected from the tube 13 into the water sampler 10.

■ Second pumping hose cleaning Following the above injection or after waiting for I, the compressor 4, air valves AVl, AV2. AV5, pinch valve 9,9'
When energized, the air valve AV
5 opens, the weighing chamber 7 is opened to the atmosphere, and the air inside the water pumping chamber 2 flows through the air valve A4 → AV3 → AVl.
It is sucked into compressor 4 through
The air discharged from the air valve flows from the air valve AV6 to the air valve AV2, and is discharged into the atmosphere from the mouth NC of the air valve AV2.

Since the pinch valve 9' is closed, the air in the metering chamber 7 is sucked into the pumping chamber 2 through the second pumping hose 8 and
The pumping hose 8 is cleaned.

■Following the step of first pumping hose cleaning (■), air valves AVl, AV2. When AV5 is de-energized and air valve AV6 is energized, the atmosphere is sucked into the compressor 4 from the port No. of the air valve AVl, and the air discharged from the compressor 4 is pinched, as shown in FIG. Valve AV 5 → AV3 → AV4
The water is then sent to pumping tank 2.

Since the pinch valves 9 and 9' are closed, the port NO of the air valve AV6 is closed, and the port NC of the air valve AV3 is closed, the pumping chamber 2 is pressurized and the air inside the pumping chamber 2 flows through the first pumping hose. 1 and is discharged into the water at the water sampling point 12, and the first pumping hose 1 is cleaned.

Note that the water that can be pumped is not limited to water in the narrow sense, but any liquid may be used.

Furthermore, as already mentioned, the order of water pumping and washing can be set arbitrarily.

Furthermore, in the above embodiment, six three-way air valves AV
1. AV2. AV3. AV4. AV5. AV6i: Therefore, the flow path switching device 5 was constructed, but as shown in FIGS. 5 and 6, four three-way air valves AV1', AV2',
It is also possible to configure the flow path switching device 5 by AV3' and AV4', and the number of air valves used in the present invention does not matter.

[Effect of idea]

The present invention has the above-mentioned configuration, and uses a compressor as a means to sequentially reduce the pressure in the pumping tank and the measuring tank.The air discharged by the compressor can be used for backwashing of pumping hoses, especially when one end is connected to sewage water, etc. The first pumping hose, which is located underwater at the water sampling point and is the most likely to get dirty, is cleaned, which prevents dirt from accumulating on the inner surface of the first pumping hose, and allows for regular cleaning of extremely contaminated sample water over a long period of time. This has the effect of making it possible to reliably collect material samples.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, FIG. 1 is a schematic configuration diagram of a water sampling device according to the present invention, and FIG. 2 is a configuration diagram of the water sampling device illustrating the configuration of a flow path switching device in the water sampling device. , 3rd
The figure is an operation time chart, FIGS. 4A to 4A are operation diagrams, and FIGS. 5 and 6 are main part configuration diagrams and operation time charts showing another embodiment of the present invention. A... Pumping hose, 1... First pumping hose, 8... Second pumping hose, 2...
Pumping water, 3...Controller, 4...
・Compressor, 5...Flow path switching device, 6
, 11...Full water sensor, 7...Weighing, 9. 9'...Pinch valve, 10...
...Water sampler, 12...Water sampling point, 13,1
4...Tube.

Claims (1)

[Scope of utility model registration request] Connect the other end of a water pumping hose, one end of which is located underwater at the water sampling point, to a closed measuring chamber equipped with a tube with a pinch valve at the bottom for supplying sample water to the water sampling device, At the bottom position, there is a closed water pumping tank with a tube with a pinch valve at the bottom for draining excess water.
The first pumping hose on the lower side pumps water at a higher position than the second pumping hose on the upper side and is installed in a state where it opens inward, and the water level is higher than the water level when the measuring chamber and the pumping chamber are full and the compressor discharges. The side and the suction side are connected by an air tube equipped with a flow path switching device, and a full water sensor is installed in each of the measuring cell and the water pumping cell to detect that the water has been pumped to the water level, and the detection results of these full water sensors are A controller is provided to control the flow path switching device and the pinch valve based on the above, and water is pumped from the water sampling point to the pumping tank by reducing the pressure in the pumping tank, and the water is pumped up based on the detection result of the full water sensor of the pumping tank. At the same time as venting to the atmosphere, water is pumped from the pumping tank to the weighing tank by reducing the pressure in the weighing tank, stopping the water pumping to the weighing tank based on the detection result of the full water sensor of the weighing tank, and opening the pinch valve to remove excess water. At the same time, the first sample water is supplied to the water sampler, and the pinch valve is closed and the water pumping chamber is pressurized.
A water sampling device characterized by being configured to backwash a pumping hose with air.