1. Field of the Invention
This invention relates generally to systems and methods for gathering liquid samples using a submersible pump placed into a pre-established well for analysis and/or groundwater removal and groundwater remediation and circulation of fluids, and more particularly to a device and system for these purposes with includes a centrifugal pump which is sized to fit into a well of 1.5 inches, or less, such as a well having an inner diameter of one inch, or less, and capable of sending a water sample upwards of 30 feet for collection and/or analysis.
2. Description of Related Art
The taking of groundwater samples from a pre-established well for the purpose of groundwater sampling and/or removal is well known. These samples are typically taken by a submersible pump device which is descended into the well as supported and controlled by electrical power conduits and a flexible fluid conduit for conveying groundwater up to the ground surface by the pump device for removal or analysis.
A number of prior art devices are known to applicant which are disclosed in the following U.S. patents:
U.S. Pat. No. 5,238,060 to Niehaus discloses a fluid sampling apparatus for withdrawing samples of groundwater or other fluids. The pump includes a packer associated therewith which minimizes the amount of liquid which must be pumped to purge the well prior to obtaining an acceptable sample.
A method and apparatus for gathering liquid samples using a submersible pump is further disclosed by Peterson in U.S. Pat. No. 6,158,509. The submersible pump is operated by means of a surface valving system and solenoid systems mounted on the submersible pump. U.S. Pat. No. 5,708,220 to Burge teaches a liquid sampling device comprising a submersible liquid sampling device and a ground level sample receiving and control facility.
Dickinson, et al., in U.S. Pat. Re. 34,754 discloses a fluid sampling apparatus for withdrawing samples of groundwater or other fluids from a well or other monitoring site, said apparatus comprising a pump means, conduit means and a wellhead assembly. U.S. Pat. No. 5,220,829 to Manke, et al. teaches a down hole formation test pump including a progressive cavity pump and Learned discloses methods, apparatus and a low-flow groundwater sampling system in U.S. Pat. No. 6,758,273.
My previous U.S. Pat. No. 7,252,141 discloses a pump having a replaceable motor. Each of the disclosures of these patents is herein incorporated by reference.
The present invention provides such a groundwater sampling device and system for withdrawing groundwater from a pre-established well having an inner diameter (ID) not exceeding 1.5 inches, typically not exceeding an ID of 1.0 inches which device is readily insertable and removable from such a small well and can lift a sample at least 30 feet, and up to or exceeding 200 feet, for collection and/or analysis, The pump must obviously be smaller than the ID of the well to assure insertion and removal, Thus, I have found that a pump of an outer dimension (OD) of about 1.4 inches is sufficiently small enough to use with a 1.5 inch ID well, and a pump of an OD of less than about 0.8 inches, e.g. preferably an OD not greater than 0.75 inch is sufficiently small to use with an 1.0 inch ID well.
Heretofore, only peristaltic pumps were capable of obtaining a sample from small wells but they were limited by lifting the sample not more than 25 feet. The inventive pump is the first centrifugal pump capable of being inserted into the well having an ID of not more than 1.5 inches and lifting a sample at least 30 feet, and no one has heretofore lifted a sample from a 1.0 inch well more than 30 feet with a pump small enough to fit with the ID of a 1.0 inch well.
This invention is directed to a groundwater sampling and pumping device and system for withdrawing groundwater from a well. The device includes a hollow outer housing having water inlet ports formed near a bottom thereof and an integral hollow conduit sized to be positioned as part of the outer housing and defining a water flow passage therethrough. An electric motor in the inner housing is connected to a water impeller operably positioned to draw groundwater into the water passage. The water passing upwardly through the integral hollow conduit can be carried directly to the surface through a flexible pipe or tube or into another stage of the pump for further increasing the pressure of the water.
It is therefore an object of this invention to provide a groundwater sampling device for withdrawing groundwater from a pre-established well of small ID which is readily insertable and removable from the well and can lift a sample a minimum of 30 feet,
It is still another object of this invention is to provide a high quality and high lifting capacity groundwater sampling device and system for withdrawing groundwater from a pre-established well of small ID and which includes an integral water passage for water flow around the motor for heightened cooling and increased motor longevity.
Yet another object of this invention is to provide a groundwater sampling device for pumping groundwater from a pre-existing well of small ID which is capable of lifting a water sample at least 30 feet from a single stage pump, but which can be combined into a multi-stage pump having a greater lifting capacity in a small ID well.
In accordance with these and other objects, which will become apparent hereinafter, the instant invention will now be described with reference to the accompanying drawings.
Referring now to the drawings, and firstly to
The device 12 is described in more detail hereinbelow and is positionable within the well formed into the ground below grade level. The depth to which the device 12 descends is controlled primarily by the feeding of the electrical conduit 14. An optional system voltage/current controller/booster 16 as will be further discussed below includes a connection to the electrical conduit 14. Electrical contacts 34, which are attachable to the terminals of a low voltage D.C. electrical power source, such as a 12 volt battery, provide the power input into the electric motor 48 and/or controller 16. By the adjustment of a variable voltage adjuster, which can be monitored by a liquid crystal display, voltage output from the controller 16 into the motor contained within the device 12 can thereby be provided. Controller 16 can be used to adjust the voltage applied to the DC voltage driven electric motor 48 (
The controller 16 inputs direct current from the 12-volt battery and produces an output voltage to run the device 12 within the specified parameters. In one embodiment, the controller 16 boosts the voltage to a fixed 39 volts and then, using a buck converter, puts out a selected fixed voltage to the pump to operate the device 12 at the selected parameters. Consideration is given to the effective wire loss to maximize water output or pressure head that can be pumped. In some circumstances known as a low flow sampling, the motor 48 will be able to pump at very low voltages near 0 volts. In such circumstances it is preferred to employ as controller 16 a low flow sampling controller.
Still referring to
Referring now to
In
The upper end of the motor 48 includes two electrical contacts 56 and 58 which receive electrical D.C. current and voltage either directly from a power source or optionally from the controller 16 through the electrical conduit 14 as will be described in more detail hereinbelow. The preferred motor operating parameters are from 12.6 to 17.4 VDC, more preferably 12.6 and 16.4 VDC, but as stated above the motor is designed to operate between 0 and about 39 volts D.C.
Note that the flow of water through water passage 88 cools the motor 48 for increasing motor life and efficiency.
Although, I have described my invention with regard to use in a well not exceeding 1.5 inch ID, preferably not exceeding 1.0 inch ID that is only illustrative of the invention and my invention could be used in a well having smaller than 1.0 inch ID provided the maximum exterior dimensions of device 12 are reduced to fit with such wells.
Referring now to
Although I have illustrated three stages at 12′, 12″ and 12″′, it should be understood that fewer or more stages can be provided to achieve the desired pressure (and have the required lifting height) of a groundwater liquid to 200 feet, or more.
In this embodiment the groundwater entering the first stage from the well is pumped through water passage 88 and then into a second stage 12″ where another impeller further acts upon the groundwater, thereby increasing its pressure and delivering it to a third stage 12′, where the process is repeated. The device 12 may be provided with sufficient stages to lift the groundwater sample to the desired height. In a particularly preferred embodiment of the pump fitting within a well of one inch ID, 24 stages have been employed.
While the instant invention has been shown and described herein in what are conceived to be the most practical embodiments, it is recognized that departures may be made therefrom within the scope of the invention, which invention is therefore not to be limited to the details disclosed herein, but is to be afforded the full scope of the claims so as to embrace any and all equivalents thereof.
This application is a non-provisional claiming domestic benefit of provisional application No. 60/992,248 filed Dec. 4, 2007 and provisional application No. 61/051,527 filed May 8,2008, the entire disclosures of which are herein incorporated by reference,
Number | Date | Country | |
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60992248 | Dec 2007 | US | |
61051527 | May 2008 | US |
Number | Date | Country | |
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Parent | 12328421 | Dec 2008 | US |
Child | 13563588 | US |