CN204327086U - Based on the groundwater sampling device of pumped well - Google Patents

Abstract

The utility model discloses a groundwater sampling device based on a pressurized well, and relates to the technical field of groundwater detection devices. The utility model comprises a water-pressing well and a detachable diversion hose fixed on the connecting rod of the water-pressing well. The water outlet pipe of the water-pressing well is provided with a plug. The device is used as a sampling source after reforming the existing pressurized well, which greatly saves the huge manpower and financial resources invested in drilling the well, and is suitable for water sample collection in areas with pressurized wells.

Description

Groundwater sampling device based on pressurized well

technical field

The utility model relates to the technical field of groundwater detection devices, in particular to a groundwater sampling device based on a pressurized well.

Background technique

Most of the existing groundwater sampling technologies are designed for traditional well drilling or special groundwater monitoring wells, such as Bailer samplers, discontinuous interval samplers, air bag pumps, gas displacement samplers, tubular lift pumps, etc. During the sampling process of these equipment, the groundwater will be more or less disturbed and the quality of the sample will be affected. On the other hand, because it requires more supporting equipment, it will require more manpower and investment when used in a field environment. Financial resources are used to drill and form wells, which results in a huge waste of manpower and financial resources.

Utility model content

The technical problem to be solved by the utility model is to provide a groundwater sampling device based on a pressurized well, which is used as a sampling source after modification of an existing pressurized well. It can save groundwater samples and save the manpower and financial resources invested in drilling wells. It is suitable for water sample collection in areas with pressurized water wells.

In order to solve the above technical problems, the technical solution adopted by the utility model is: a groundwater sampling device based on a pumping well, including a pumping well and a detachable diversion hose fixed on the connecting rod of the pumping well, the pumping well There is a plug in the outlet pipe.

The detachable fixing is fixed by clamps.

The clamp is made of copper or stainless steel.

The blocking material is polytetrafluoroethylene or silica gel.

The number of diversion hoses is 1-3, and the distance from the water inlet of the diversion hose to the upper surface of the pressure well piston is less than 10mm.

The inner diameter of the diversion hose is 4-6 mm.

The beneficial effects produced by adopting the above-mentioned technical scheme are: the device is suitable for collecting water samples in areas with pressurized wells, and a diversion device is added on the pressurized well to divert the groundwater from the pressurized well to the sampling bottle. The device can not only collect the original groundwater, meet the requirements of groundwater monitoring standards, but also save the cost of drilling wells and avoid huge waste of manpower and financial resources.

Description of drawings

Fig. 1 is a structural representation of the utility model;

In the figure: 1, piston; 2, pressure well; 3, connecting rod; 4, clamp; 5, plugging; 6, diversion hose; 7, sampling bottle.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

Pressurized wells are commonly used to draw groundwater in vast rural areas, especially in mountainous and hilly areas, which provides the conditions for groundwater sample collection for groundwater pollution investigations or rural drinking water safety research in this area. In these areas, the existing pressurized wells are used for water Sample collection will save a lot of drilling costs. Even so, if the well water is directly pressed and the water sample is collected from the outlet pipe, the water sample collected in this way will be disturbed by the movement of the piston up and down after the water sample is pressed from the well, and it will be disturbed by the direct contact with the air. Oxygen exposure problems caused by exposure to water, and therefore cannot meet the water sample collection requirements for anaerobic indicators, anaerobic CO ₂ indicators, and volatile substances or gas indicators.

This utility model provides a device for sampling the existing pumping well 2, specifically, the diversion hose 6 is installed on the connecting rod 3 of the pumping well 2, and it is close to the upper surface of the piston 1, and at the outlet Plugging 5 is installed at the water pipe, and when water is pressed out from the well, it can flow into the sampling bottle 7 through the diversion hose 6, that is, groundwater flows in a sealed passage from the well to the sampling bottle, and the collected water It will neither be disturbed nor contact with the outside air, which is closer to the original groundwater quality. The utility model uses the diversion function of the diversion hose 6 to connect with the pressurized well 2, so that the process of collecting water samples by using the pressurized well 2 is simple and convenient, and can also ensure the sampling quality of groundwater to the greatest extent, making the collected samples closer to Pristine groundwater meets stringent sampling standards.

Wherein the detachable fixing of the diversion hose 6 and the connecting rod 3 is fixed by the clip 4, and the material of the clip 4 is copper or stainless steel; or copper bars or steel bars are used to bypass the diversion hose 6 and the connection Bar 3, then use buckle or snap ring to clamp the two ends of copper bar or steel bar and get final product.

The material of the plugging 5 is polytetrafluoroethylene material or silica gel material, and the purpose of blocking the outlet pipe is to ensure that a sufficient amount of groundwater is stored in the pressurized well 2 per unit time to supply the water flow in the diversion hose 6, so as to avoid Frequent and rapid water pressure will cause disturbance to the groundwater and affect the sampling effect.

In order to avoid collecting the surface water in the well that is in contact with the air, the water inlet of the diversion hose 6 should extend into the water surface. The specific position is close to the piston 1 and kept at a distance less than 10mm from the upper surface of the piston 1. 2. The groundwater on the pressure directly enters the diversion hose 6, and collects the groundwater as it is.

The inner diameter of the diversion hose 6 is 4-6mm, which should not be too thick or too thin. For collecting many bottles of water samples at the same time, 2 or 3 diversion hoses 6 can be connected at the same time.

During operation, first press up the piston 1 of the pressure well 2, put the inlet nozzle of the diversion hose 6 close to the upper surface of the piston 1 and fix it with the connecting rod 3, when the piston 1 moves up and down, the diversion hose 6 moves up and down together with the connecting rod 3, the nozzle of the diversion hose 6 is always at the same distance from the piston 1 and is submerged in the water; when the pressure water is sampled, the outlet nozzle of the pressure water well 2 is blocked by the plug 5, Since the wellbore is full of water in the water pressing process, the water flow will flow into the sampling bottle 7 placed on the ground along the diversion hose 6 under the action of siphon. And because the diversion hose 6 is submerged below the groundwater surface that is sucked up from the well all the time, as long as the pressure well 2 is airtight, what flows out in the diversion hose 6 will be the original groundwater that does not contact with the air all the time. For avoiding that the water sample held at the water outlet of the diversion hose 6 is in contact with the atmosphere, the diversion hose 6 is penetrated into the bottom of the bottle, and the underground water is drained upwards and collected from the bottom of the bottle to the bottle mouth.

In field practice, the device was used to carry out sampling tests on several pressurized wells 2, and the statistical analysis showed that the dissolved oxygen index was reduced from the previous average of 2.5mg/L to 0.12mg/L, and the lowest dropped to 0. It can be seen that the obtained groundwater is very close to the original groundwater. It should be pointed out that the premise of using this method to obtain the original groundwater is that the pressurized well 2 is used frequently and in good condition, and there are no other problems such as air leakage of the piston and the well pipe itself, otherwise the sampling effect will be significantly reduced.

The water samples collected by this device can accurately and truly measure on-site indicators closely related to groundwater oxidation-reduction conditions, such as dissolved oxygen indicators, oxidation-reduction potential indicators, etc., and can also meet the sampling requirements of other indicators that need to avoid contact with the atmosphere Requirements, greatly improving the authenticity of data such as some sensitive indicators and volatile gas indicators.

The device can simply and conveniently realize the sampling of the pressurized water well 2, the groundwater extracted from the tube well has no disturbance and no air bubbles, and the groundwater is guided into the sampling bottle 7 in a closed manner along the diversion hose 6, and then the bottom of the bottle overflows the mouth of the bottle to collect water samples , so that the collected samples are as close as possible to the original groundwater, and meet the requirements of water sample collection for anaerobic or anaerobic indicators and volatile substances or gases.

Claims (6)

1. based on a groundwater sampling device for pumped well, it is characterized in that: comprise pumped well (2) and the detachable stream guiding tube (6) be fixed on pumped well (2) connecting rod (3), in the outlet pipe of described pumped well (2), be provided with shutoff (5).

2. the groundwater sampling device based on pumped well according to claim 1, is characterized in that: described detachable being fixed as adopts clip (4) to fix.

3. the groundwater sampling device based on pumped well according to claim 2, is characterized in that: the material of described clip (4) is copper or stainless steel material.

4. the groundwater sampling device based on pumped well according to claim 1, is characterized in that: the material of described shutoff (5) is polytetrafluoroethylmaterial material or silica gel material.

5. the groundwater sampling device based on pumped well according to claim 1, is characterized in that: described stream guiding tube (6) is 1-3 root, and stream guiding tube (6) water inlet is less than 10mm to the distance of pumped well (2) piston (1) upper surface.

6. the groundwater sampling device based on pumped well according to claim 1, is characterized in that: the internal diameter of described stream guiding tube (6) is 4-6 mm.