SU900158A1 - Device for liquid batch - Google Patents

Description

(54) DEVICE FOR PORTABLE SAMPLING

LIQUIDS

one

The invention relates to a technique for studying the chemical and physical properties of substances, specifically to devices for sampling liquids in separate portions (doses), for example, water from open reservoirs and drains, or for sampling wastewater from sewer manholes and is intended for use in the quality of wastewater discharged into water bodies, and natural waters of rivers and reservoirs.

A device for sampling a liquid is known, which contains a spillway tray, a distributor, collecting tanks with metering devices and shut-off valves 1.

However, this device does not ensure the reliability of the sampled fluid (although sampling is carried out in a clean vessel once), the main lines are used repeatedly without preparation.

The closest to the invention is with a device for batch sampling of liquid from reservoirs, including a container with a suction pipe, sampling vessels with drain pipes connecting the vessels to the container, and control box 2. The disadvantage of the device is that after filling all The vessels are out of service at 5 research institutes, i.e. it must be manually reloaded and the sampling vessels must be replaced with empty and clean ones.

In addition, the hydraulic line of motion of the liquid under study is able to accumulate harmful substances on its surfaces, which significantly reduce the reliability of the samples taken, which makes it doubtful that, in some cases, the sample’s representativeness of the hydraulic circuit will n15 saschena harmful substances.

The purpose of the invention is to increase the representativeness of the sample and automate the process.

This goal is achieved by the fact that, in

20 a device for batch sampling of liquid from reservoirs, including a con-tanker with a suction pipe, sample vessels with drain pipes connecting the vessels to the container, and a control unit; the container is sealed, equipped with drain pipes, controlled by a valve and a vacuum pump , the device is equipped with an apparatus for supplying washing solution, flushing and drain tank with drain pipe connected to the reservoir and equipped with controllable valves, each of the sampling vessels is installed above the drain pipe, sleep It is equipped with an air drainage tube, the inlet end is fixed on the container above the liquid level, and the flushing tube connected to the flushing and drain tank, while the drain tubes are made with a knee-shaped protrusion directed upwards and connected to the drain nozzles of the container.

Moreover, each sampling vessel is provided with a stopper for fastening the tubes.

In addition, each flushing tube is provided with an elastic tip that is installed with the possibility of mixing along the bottom of the sampling vessel.

While the drain pipes are located at the bottom of the container.

Such a constructive implementation ensures the rise of water from free-flow drains, filling a portion of water only with a previously prepared empty sampling vessel with a minimum number of controllable valves, the formation of air plugs in the elbows of the drain pipes, as the liquid entering the container closes the entrance to the drain pipe, thereby locking the air in it, in case the sampling vessel is filled with liquid. Upon further filling of the container with the test liquid, the air tube squeezes somewhat and isolates the liquids in the container and in the filled vessels, i.e., the system forms in the filled tubes of the filled vessels: a cylinder with air — a water piston. Therefore, a new fluid sample is taken only in an empty sampling vessel with liquid-free drain and drainage tubes.

Thus, the air plugs replaced the control valves that were to be installed at the inlets of the test liquid in the sampling vessels. Under the conditions of exposure to aggressive liquid, chemically inert air traps work more reliably than control valves with metallic and chemically unstable parts that break under the conditions of exposure to corrosive media, contaminated with products of such interaction, and selected samples of the liquid under study.

Each sampling vessel is equipped with a removable stopper, which ensures a relatively simple discharge of the sample from the sampling vessel and, if necessary, the replacement of this vessel with a clean one.

The execution of the flushing tube with an elastic tip eliminates the delay of solid particles at the bottom of the vessel and ensures that the sample of the test liquid is expelled from the vessel, followed by the removal of the cleaning solution and emptying the vessel.

The drawing shows a schematic diagram of the device.

The device contains a sealed container 1, which is intake

tube 2 is connected to a non-pressure reservoir, for example, tray 3 of waste water, connected to container 1 vacuum pump 4, connected via drain pipes 5 to container 1 sampling vessels 6, each of which is additionally connected to container 1 by an air-drain pipe 7, and washing the tube 8 is connected to a hermetic flush-drain tank 9. The container 1 is provided with a controllable valve 10 for communicating the internal cavity of the container 1 with the atmosphere of air.

The intake end of the intake pipe 2 is installed in the tray 3 below the minimum water level in it so that, with any fluctuations in the water level in the latter, the intake pipe is in the water, excluding the air being drawn through it.

The nozzle 11 of the input of the air-drainage tube 7 in the container 1 is installed at the last above the maximum level

0 liquid (MU) in the container 1. The drain pipes 5 are made with a knee-shaped protrusion and are set vertically with the knee up so that the lower points of the cross sections of these tubes 5, taken in the middle of the knee, are located above the points of the cross sections of the drain nipples 12 of the container 1 (distance h).

Each sampling vessel 6 has a removable plug 13 installed in it with a seal, in which the drain is fixed

0 tube 5, air drainage tube 7 and flushing tube 8, provided with an elastic tip,. located at the bottom of the sampling vessel 6 with the ability to move under the influence of a pressure (jet) jet of cleaning solution.

 Each flushing tube 8 is equipped with a controllable valve 14 mounted above the flushing and drainage tank 9 containing a nozzle 15 of the inlet, which by means of the controlled valve 16 is connected to

0 by means of an apparatus 17 for supplying a washing solution, and a discharge pipe 18, which is connected via controllable valve 19 to the tray 3 of waste water. The drive of the vacuum pump 4, controlled air valves 10, 14, 16 and 19 are electrically connected to the unit

5 20 controls, to which the control of the detergent solution supply apparatus 17 is connected. Each of the sampling vessels 6 is set so that the maximum

the liquid level in it is located below the bottom of the container 1, but each sampling vessel 6 is installed above the nozzle 18 of the flushing flushing tank 9. The drain nozzles 12 of the input of the drain pipes 5 are installed on the container 1 so that their lower cross-section point is located at the bottom of the bottom container 1.

As the apparatus 17 for supplying the washing solution, a container with the washing solution and a pump for supplying the washing solution to the flushing and drainage tank 9 can be used. The drive of the pump for supplying the washing solution is electrically connected to the control unit 20.

As the washing solution, heated tap water is used with the addition of a solvent, which is chosen, based on the chemical composition of the controlled liquid.

If the device works with an aggressive liquid, all parts in contact with the controlled aggressive liquid are made of glass, chemically resistant plastics and rubber. The required number of sampling vessels in the device is determined by the number of samples taken over a set period of time, the time needed to preserve the sample and their shift, for example, with hourly sampling and saving it within 24 hours from the moment the sample is taken, 24 sample vessels are required. The capacity of the sampling vessel 6 is determined by the need and sufficiency of the amount of the monitored liquid for the corresponding analysis. Thus, when controlling most natural and waste waters, 500-600 ml is sufficient for analysis.

Each of the sampling vessels b is marked, for example, digital, which determines the time of sampling of water in accordance with a given program of control unit 20. The controlled air valve 10 is normally open, and all other control valves 14, 16 and 19 are normally closed.

The device works as follows.

The control unit 20 sets the mode of operation of the device, i.e., the frequency of sampling for, for example, a day with the number of sampling vessels 6 present.

On command of the control unit 20, the controlled air valve is closed, n 10, and a vacuum pump 4 is turned on, which creates a partial decrease in pressure in container 1, sufficient to lift water due to atmospheric pressure from tray 3 through the intake pipe 2 to container 1. Water entering into the container 1, fills it and through the drain nozzle 12 enters the drain pipe 5 and further into the sampling vessel 6, if it is empty. In filled

The sampling vessel 6 which has not been previously controlled by the water will not arrive at the sample because a stopper is formed in the upper part of the knee of the drain pipe 5, which prevents water from entering the sampling vessel.

vessel.

When the sampling vessel is filled with water, the air displaced by it leaves the latter through the air-drainage tube 7 into container 1. Water enters container 1 until the water level in it exceeds the level of the upper cross section of the knee of tube 5, taking that in the middle. This moment is determined by the predetermined program to control unit 20. Upon reaching this level

5, the sampling vessel b is filled with fully controllable water and at this moment the drive of the vacuum pump 4 is turned off by the control unit 20, at the command of which the controllable air valve 10 opens, connecting the cavity

0 container 1 with the atmosphere.

In container 1, air flows through the open controlled air valve 10, pressure is equalized and the water in container 1 is drawn through the intake pipes. ke 2 goes to tray 3. This leaves water and from the knee part of the knee of the drain pipe 5 adjacent to the drain nozzle 12 to the lowest point of the cross section of this knee, i.e. the whole

0 a sampling vessel b and fixed in a removable cork 13 is the vertical part of the spring tube 5 and the lower part of the air drainage tube 7.

If it is necessary to drain the sample, a removable plug 13 is removed from the sampling vessel at the beginning, with the drain 5, the air-drainage 7 and the flushing 8 tubes fixed in it, then the sampling vessel is emptied and reinstalled. removable plug 13 with tubes 5, 7 and 8. If the water sample for analysis was not drained, it is stored in the sampling vessel b until it is emptied in automatic mode in accordance with a predetermined program specified by the unit

5 20 controls

At the command of the control unit 20, the normally-closed control valve 14 of that sampling vessel is opened, which, according to the program set by the control unit 20, must be prepared at the time in question to prepare a new portion of the water sample. Meanwhile, the normally-open controlled air valve 10 remains open. Then, the control valve 16 is opened and

5, a command from the controlled unit 20 from the apparatus 17 for supplying the washing solution is supplied with the washing solution into the flushing and drainage tank 9, from where through the open controlled valve 14 through the flushing tube 8 enters the working part of the sampling vessel 6. The incoming washing solution is squeezing out the sampling solution the vessel 6 there is a portion of water that is displaced through the drain tube 5 and partially through the drainage tube 7 into the container 1, from which water is discharged through the suction tube 2 into the tray 3. Since the tip of the wash tube 8 is inserted into the pipe The collection vessel 6 is made of elastic material and is placed on the bottom of the sampling vessel 6 freely, under the action of a jet of washing solution escaping under pressure, it moves along the bottom of the sampling vessel 6, which contributes to the distribution of the washing solution throughout the vessel and its uniform washing.

If, when rinsing the sampling vessel 6, to close the controlled air valve 10 and to turn on the vacuum pump 4, the container 1 with the washing solution will be filled much more completely and the rinsing will be better. To improve the rinsing of the container 1 with the washing solution, the controlled air valve 10 is opened and closed several times.

After a set, but sufficient for thorough washing of the sampling vessel 6, the command of the controllable unit 20 closes the controllable valve 16, and opens the normally closed controllable valve 19 through which the liquid, i.e. the washing solution, is in the drain tank 9 begins to drain into the tray 3 of the waste water. Since the sampling vessel 6 is located above the drain pipe 18, a siphon is formed, including a tray 3, a tube connected to the discharge pipe 18 with a controllable valve 19, a flushing and drainage tank 9, a washing tube 8 attached to it, and a sampling valve vessel 6. In this siphon, the end of the flushing tube 8 located in the sampling vessel 6 is located significantly higher than the end of the tube extending into the tray 3 from the control valve 19.

Therefore, when the controlled valve 19 is opened, i.e., with the beginning of the displacement of the liquid from the drain tank 9, the specified siphon takes effect and the liquid (washing solution) is withdrawn by this siphon from the sampling vessel 6 of the flushing pipe 8 through the flushing drain tank 9, pipe 18 drain in tray 3 waste water. After the time required for the complete emptying of the sampling vessel 6, the control valves 14 and 19 control the control unit 20, while the flushing and draining tank 9, the flushing tube 8, the sampling vessel 6 and the container 1 remain filled only with air, and the sampling vessel 6 is prepared to receive another portion of the water sample. That is, this operation finishes the preparation of the automatic sampling vessel 6.

Next, at the command of the control unit 20

At the time set by the program for taking the next portion of the water sample, the normally open controlled valve 10 is closed, the vacuum pump 4 is turned off and then the container 1 and the flushed before it is filled through the intake tube 2

sampling vessel 6.

The economic effect of the device is determined by the fact that it is mainly intended for use in the field of water protection for sampling wastewater discharged into watercourses (rivers, lakes, reservoirs), with the aim of timely establishing the fact of an emergency discharge or unacceptable discharge for timely measures to reduce the possible adverse effects and at the same time accurately establishing the fact of the dumping and identifying the person responsible for the dumping. The positive effect from the use of the invention is manifested in the ecological positive effect, since it contributes to the solution of the problem of environmental protection, in particular, protection of water resources.

The device frees security officers from day-to-day sampling of wastewater, reduces the cost of organizing the workplace, eliminates the need to have a room for storing samples and an appropriate instrument for sampling. In addition, the device may be included in an automatic water quality control system.

Claims (1)

1. A device for batch sampling of fluid from reservoirs, including a container with a suction pipe, sampling vessels with drain pipes connecting the vessels to the container, and a control unit, characterized in that, in order to increase the representativeness of the sample and automate the process, the container is sealed , is equipped with a drain nozzle, controlled valve and vacuum pump, the device is equipped with an apparatus for supplying washing solution, flushing tank with drain nozzle / connected to the reservoir and equipped with In addition, each of the sampling vessels is installed above the discharge nozzle, equipped with an air-drainage tube, the inlet end of which is fixed to the container above the liquid level, and a flushing tube connected to the flushing and drainage tank, while the drainage tubes are made with a knee-shaped protrusion.