A portable small flow constant pressure test water supply device

Abstract

The present invention discloses a portable small flow constant pressure test water supply device, comprising: a portable water storage device, a micro pressure regulating device and a pressure stabilizing device; the portable water storage device is connected to one end of the micro pressure regulating device through a water supply pipeline; it is used to transport water to the micro pressure regulating device under the action of water pressure; the other end of the micro pressure regulating device is connected to one end of the pressure stabilizing device through a water outlet pipeline; it is used to provide and adjust the water pressure to obtain a constant pressure head of a small flow, and transport the constant pressure head of a small flow to the pressure stabilizing device through the water outlet pipeline; the pressure stabilizing device is used to adjust the pulsating water pressure, and output the adjusted constant pressure head of a small flow or send it to a permeameter through a connecting pipeline. The water supply device provided by the present invention is small in size and movable, and is easy to install. It can be connected to a permeameter or an in-situ permeability sample under inconvenient water supply conditions in a laboratory or in the field, and can realize a permeability test of weakly permeable soil or rock samples under low pressure.

Description

Technical Field

[0001] The invention relates to the technical field of geotechnical engineering testing instruments, in particular to a portable small-flow constant-pressure testing water supply device. Background Art

[0002] The permeability and permeability deformation characteristics of weak interlayers of soil or rock are one of the important physical and mechanical properties of soil, and are one of the basic parameters required for seepage control of water conservancy and hydropower engineering hubs, seepage stability analysis of foundations and slopes, seepage stability evaluation of building foundation pits, seepage flow calculation, regional groundwater resource management and evaluation, etc. In the process of permeability deformation test of weak permeability soil or weak interlayers of rock, the permeability gradient applied to the sample gradually increases from low to high within a certain pressure range, and the outflow is relatively small before the permeability damage occurs; if similar tests are conducted in the field, especially in tunnels, the constant pressure water supply system is a problem.

[0003] One of the existing methods for obtaining a constant water head is to use an overflow water tank to supply water, which is mainly composed of an overflow water tank, an inlet pipe, an outlet pipe, an overflow pipe and a lifting system. Water flows continuously into the water tank from the inlet pipe and overflows through the overflow pipe, so that the water head in the outlet pipe is maintained at the height of the water tank. By adjusting the height of the overflow water tank, the various levels of water head required for the test are obtained. The main disadvantage of this method is that since the bucket needs to be lifted up and down, the inlet pipe, outlet pipe and overflow pipe must use hoses. During the test, the three hoses are entangled on the ground, occupying a large area. When multiple sets of such water supply systems are arranged in the laboratory, the laboratory environment is seriously affected. In addition, the inlet pipe needs to be connected to a stable water source.

[0004] Another method of the prior art is the solenoid valve controlled water supply system, whose main working principle is to control the upper and lower limits of the water level in the water supply cylinder through a water level measuring needle, and its fluctuation range is less than 1mm. When the water level in the cylinder is lower than the lower limit of the water level, the solenoid valve opens and water enters the cylinder; when the water level in the cylinder is higher than the upper limit of the water level, the solenoid valve closes and stops supplying water to the cylinder, thereby achieving a constant water head. The advantages of the solenoid valve controlled water supply system mainly lie in overcoming the problem of water pipes occupying space and being entangled with each other in the overflow bucket water supply system, making the laboratory more beautiful. However, there are also some shortcomings: the system needs to be fixed indoors and needs to be connected to a stable water source externally; the water flow generates impact force when the solenoid valve is closed and opened, causing water pressure pulsation, and its water level stability is not as good as the overflow water tank water supply system; when there are too many impurities in the water, it is also easy to cause the solenoid valve to fail to open and close, and it is also necessary to be equipped with a more complex distribution cabinet.

[0005] In addition, there is a method of using a variable frequency constant pressure water pump to obtain a stable water head. The principle is mainly to adjust the speed of the water pump through the frequency converter, thereby realizing the automatic pressure adjustment function. When the water inlet pressure is lower than the set pressure, the frequency of the frequency converter increases, the speed of the water pump increases, and the water supply pressure increases; when the water inlet pressure is higher than the set pressure, the frequency of the frequency converter decreases, the speed of the water pump slows down, and the water supply pressure decreases, so that the water supply pressure is stabilized at the set pressure. The main shortcoming of the variable frequency constant pressure water pump water supply is that the head stability accuracy is insufficient. When the required flow rate is extremely small, the system will think that water supply is not needed at this time. In order to save electricity and extend the service life of the pump, the water pump will stop running; moreover, if the required flow rate is very small and the pump speed is extremely low, it will also cause the water supply pressure to be unstable, which will have a serious impact on the test results.

[0006] Another type of telescopic overflow constant pressure water supply device has the characteristics of high-precision, large-flow constant pressure water supply, but the disadvantage of this device is that the device needs to be fixed on an indoor base and connected to a stable external water source, and cannot be used outdoors. In summary, the main problems with the existing constant pressure water supply equipment are:

[0007] 1. Conventional overflow water tanks occupy a large area and seriously affect the laboratory environment.

[0008] 2. The test head accuracy of solenoid valves and variable frequency constant pressure water pumps is poor, and it is difficult to adapt to small flow constant pressure water supply tests.

[0009] 3. When using a conventional overflow water tank, solenoid valve, variable frequency constant pressure water pump, or telescopic overflow constant pressure test water supply system, it is necessary to connect to an external stable water source, the equipment is fixed to the base, and is not portable.

[0010] 4. The test head accuracy of solenoid valves and variable frequency constant pressure water pumps is poor, and water pressure fluctuations have a great impact on the test. Summary of the invention

[0011] The present invention provides a portable small-flow constant-pressure test water supply device, which solves the above-mentioned technical problems.

[0012] The present invention provides a portable small flow constant pressure test water supply device, comprising: a portable water storage device, a micro pressure regulating device and a pressure stabilizing device;

[0013] The portable water storage device is connected to one end of the micro pressure regulating device through a water supply pipeline; the portable water storage device is used to transport water to the micro pressure regulating device through the water supply pipeline under the water pressure provided by the micro pressure regulating device;

[0014] The other end of the micro pressure regulating device is connected to one end of the pressure stabilizing device through a water outlet pipeline; the micro pressure regulating device is used to provide water pressure and adjust the water pressure to obtain a small flow constant pressure head, and transport the small flow constant pressure head to the pressure stabilizing device through the water outlet pipeline;

[0015] The pressure stabilizing device is used to regulate the pulsating water pressure in the water outlet pipeline; output the regulated small flow constant pressure water head or transport the regulated small flow constant pressure water head to the permeameter through the connecting pipeline.

[0016] Optionally, the micro pressure regulating device is also used to perform stepless regulation of the water pressure.

[0017] Optionally, the micro pressure regulating device comprises: a micro booster pump and a return water regulating valve;

[0018] One end of the micro booster pump is connected to the portable water storage device through a water supply pipeline, and the other end is connected to the pressure stabilizing device through a water outlet pipeline; the micro booster pump is used to provide water pressure;

[0019] The return water regulating valve is installed on the return water pipeline; one end of the return water pipeline is connected to the water inlet pipeline, and the other end is connected to the water outlet pipeline; the return water regulating valve is used to adjust the water pressure provided by the micro booster pump to obtain a small flow constant pressure water head, so that the micro booster pump can transport the small flow constant pressure water head to the pressure stabilizing device through the water outlet pipeline.

[0020] Optionally, the pressure stabilizing device includes a pressure stabilizing container, a pressure gauge, an exhaust pipe and an exhaust valve;

[0021] One end of the pressure-stabilizing container is connected to the micro pressure-regulating device through a water outlet pipeline; the other end is connected to the permeameter through a connecting pipeline;

[0022] A pressure gauge is installed on the pressure-stabilizing container, and an exhaust pipe and an exhaust valve are arranged on the top.

[0023] Optionally, a micro booster pump and a return water regulating valve; the pressure stabilizing device includes a pressure stabilizing container, a pressure gauge, an exhaust pipe and an exhaust valve;

[0024] One end of the micro booster pump is connected to the portable water storage device through a water supply pipeline, and the other end is connected to the pressure stabilizing container through a water outlet pipeline;

[0025] The return water regulating valve is installed on the return water pipeline; one end of the return water pipeline is connected to the water inlet pipeline, and the other end is connected to the water outlet pipeline; the return water regulating valve is used to adjust the water pressure provided by the micro booster pump to obtain a small flow constant pressure water head, so that the micro booster pump delivers the small flow constant pressure water head to the pressure stabilizing container through the water outlet pipeline;

[0026] One end of the pressure-stabilizing container is connected to the micro-boosting pump through a water outlet pipeline; the other end is connected to the permeameter through a connecting pipeline; a pressure gauge is installed on the pressure-stabilizing container, and an exhaust pipe and an exhaust valve are arranged on the top; the pressure-stabilizing container is used to adjust the pulsating water pressure in the water outlet pipeline.

[0027] Optionally, the return water regulating valve is also used to perform stepless regulation on the water pressure provided by the micro booster pump.

[0028] Optionally, the pressure-stabilizing container is a cylindrical organic glass barrel.

[0029] Optionally, the portable water storage device is a plastic bucket.

[0030] Optionally, a valve is provided on the connecting pipeline connecting the pressure stabilizing device and the permeameter; a water valve is provided on the water outlet pipeline connecting the micro pressure regulating device and the pressure stabilizing device.

[0031] Beneficial effects of the invention: Compared with the prior art, the invention has obvious advantages. Due to its small footprint, compactness, and easy installation, the whole device is portable and can be connected to a permeameter or an in-situ permeability sample. It can realize permeability tests of weakly permeable soil or rock samples under low pressure, making it possible to conduct permeability tests in field tunnels where water supply is difficult, and multiple sets of water supply devices can be arranged simultaneously in the laboratory or in the field, so that multiple groups of tests can be carried out at the same time, greatly improving work efficiency; and the water pressure can be arbitrarily adjusted within a certain range to realize small-flow constant-pressure water supply, and the test reliability is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a portable small flow constant pressure test water supply device provided in Example 1 of the present invention;

[0033] Figure 2 It is a structural schematic diagram of a portable small flow constant pressure test water supply device provided in Example 2 of the present invention;

[0034] Figure 2 In the figure: 1-micro booster pump; 2-water outlet pipe; 3-water return pipe; 4-water return regulating valve; 5-portable water supply bucket; 6-water supply pipe; 7-water valve; 8-pressure stabilizing container; 9-pressure gauge; 10-exhaust pipe; 11-exhaust valve; 12-connecting pipe; 13-valve; 14-permeameter connecting pipe. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0036] Example 1

[0037] This embodiment provides a portable small flow constant pressure test water supply device, such as Figure 1 Shown are: portable water storage device, micro pressure regulating device and pressure stabilizing device;

[0038] The portable water storage device is connected to one end of the micro pressure regulating device through a water supply pipeline; the portable water storage device is used to transport water to the micro pressure regulating device through the water supply pipeline under the water pressure provided by the micro pressure regulating device;

[0039] The other end of the micro pressure regulating device is connected to one end of the pressure stabilizing device through a water outlet pipeline; the micro pressure regulating device is used to provide water pressure and adjust the water pressure to obtain a small flow constant pressure water head, and transmit the small flow constant pressure water head to the pressure stabilizing device through the water outlet pipeline;

[0040] The pressure stabilizing device is used to regulate the pulsating water pressure in the water outlet pipeline; output the regulated small flow constant pressure water head or transmit the regulated small flow constant pressure water head to the permeameter through the connecting pipeline.

[0041] In this embodiment, the micro pressure regulating device can also be used to perform stepless regulation of the water pressure.

[0042] In this embodiment, the micro pressure regulating device may include: a micro booster pump and a return water regulating valve;

[0043] One end of the micro booster pump is connected to the portable water storage device through a water supply pipeline, and the other end is connected to the pressure stabilizing device through a water outlet pipeline; the micro booster pump is used to provide water pressure;

[0044] The return water regulating valve is installed on the return water pipeline; one end of the return water pipeline is connected to the water inlet pipeline, and the other end is connected to the water outlet pipeline; the return water regulating valve is used to adjust the water pressure provided by the micro booster pump to obtain a small flow constant pressure head, so that the micro booster pump can deliver the small flow constant pressure head to the pressure stabilizing device through the water outlet pipeline.

[0045] In this embodiment, the pressure stabilizing device may include a pressure stabilizing container, a pressure gauge, an exhaust pipe and an exhaust valve;

[0046] One end of the pressure-stabilizing container is connected to the micro pressure-regulating device through a water outlet pipeline; a pressure gauge is installed on the pressure-stabilizing container, and an exhaust pipe and an exhaust valve are arranged on the top.

[0047] The pressure-stabilizing container is used to regulate the pulsating water pressure in the water outlet pipeline and output the regulated small flow constant pressure water head. In this embodiment, the other end of the pressure-stabilizing container can also be connected to the permeameter through a connecting pipeline; accordingly, the regulated small flow constant pressure water head is delivered to the permeameter through the connecting pipeline.

[0048] In this embodiment, the micro pressure regulating device may include: a micro booster pump and a return water regulating valve; the pressure stabilizing device includes a pressure stabilizing container, a pressure gauge, an exhaust pipe and an exhaust valve;

[0049] One end of the micro booster pump is connected to the portable water storage device through a water supply pipeline, and the other end is connected to the pressure stabilizing container through a water outlet pipeline;

[0050] The return water regulating valve is installed on the return water pipeline; one end of the return water pipeline is connected to the water inlet pipeline, and the other end is connected to the water outlet pipeline; the return water regulating valve is used to adjust the water pressure provided by the micro booster pump to obtain a small flow constant pressure water head, so that the micro booster pump can deliver the small flow constant pressure water head to the pressure stabilizing container through the water outlet pipeline;

[0051] One end of the pressure-stabilizing container is connected to a micro-boosting pump through a water outlet pipeline; the other end is connected to an infiltration instrument through a connecting pipeline; a pressure gauge is installed on the pressure-stabilizing container, and an exhaust pipe and an exhaust valve are provided on the top; the pressure-stabilizing container is used to adjust the pulsating water pressure in the water outlet pipeline.

[0052] In this embodiment, the return water regulating valve can also be used to perform stepless regulation on the water pressure provided by the micro booster pump.

[0053] In this embodiment, preferably, the pressure-stabilizing container is a cylindrical organic glass barrel.

[0054] In this embodiment, preferably, the portable water storage device is a plastic barrel.

[0055] In this embodiment, a valve may be provided on the connecting pipeline connecting the pressure stabilizing device and the permeameter; a water valve may be provided on the water outlet pipeline connecting the micro pressure regulating device and the pressure stabilizing device.

[0056] The present embodiment provides a portable small-flow constant-pressure test water supply device, which occupies a small area, is compact, and easy to install. The whole set of equipment is portable and is not affected by the site and water source. The water supply flow and water pressure can be adjusted arbitrarily. It can be connected to a permeameter or an in-situ permeability sample, and can realize permeability tests of weakly permeable soil or rock samples under low-pressure conditions, making it possible to conduct permeability tests in field tunnels where water supply is difficult; and multiple sets of water supply devices can be arranged at the same time in the laboratory or in the field, so that multiple groups of tests can be carried out at the same time, greatly improving work efficiency; it can also realize stepless pressure regulation between water supply pressures, and the water pressure stability accuracy is less than 1mm, which can meet the requirements of small-flow constant-pressure water supply within a certain pressure range.

[0057] Example 2

[0058] This embodiment provides a portable small flow constant pressure test water supply device, such as Figure 2 Shown are: portable water storage device, micro pressure regulating device and pressure stabilizing device;

[0059] The portable water storage device includes: a portable water supply bucket 5; the micro pressure regulating device includes: a micro booster pump 1 and a return water regulating valve 4; the pressure stabilizing device includes a pressure stabilizing container 8, a pressure gauge 9, an exhaust pipe 10 and an exhaust valve 11;

[0060] One end of the micro booster pump 1 is connected to a portable water supply bucket 5 via a water supply pipeline 6, and the other end is connected to a pressure stabilizing container 8 via a water outlet pipeline 2;

[0061] The return water regulating valve 4 is installed on the return water pipeline 2; one end of the return water pipeline 2 is connected to the water inlet pipeline 6, and the other end is connected to the water outlet pipeline 2; the return water regulating valve 4 is used to adjust the water pressure provided by the micro booster pump 1 to obtain a small flow constant pressure water head, so that the micro booster pump can deliver the small flow constant pressure water head to the pressure stabilizing container 8 through the water outlet pipeline 2;

[0062] One end of the pressure-stabilizing container 8 is connected to the micro-boosting pump 1 through the outlet pipe 2; the other end is connected to the permeameter connecting pipe 14 through the connecting pipe 12; a pressure gauge 9 is installed on the pressure-stabilizing container 8, and an exhaust pipe 10 and an exhaust valve 11 are arranged on the top; the pressure-stabilizing container 8 is used to adjust the pulsating water pressure in the outlet pipe 2;

[0063] A valve 13 may also be provided on the connecting pipe 12 connecting the pressure-stabilizing container 8 and the permeameter connecting pipe; a water valve 7 may also be provided on the water outlet pipe 2 connecting the micro-boosting pump 1 and the pressure-stabilizing container 8 .

[0064] As described above, in the portable small flow constant pressure test water supply device, when the return water regulating valve 4 is completely closed, the water supply system provides the highest water pressure.

[0065] As described above, the portable small flow constant pressure test water supply device, the micro booster pump 1 has a maximum head of 10m, and can provide a constant water pressure within the range of 0-8m under the regulation of the return water regulating valve 4.

[0066] As described above, the portable small flow constant pressure test water supply device, the pressure stabilizing container 8 is made of transparent organic glass.

[0067] As described above, the portable small flow constant pressure test water supply device, the portable water supply barrel 5 is connected to the micro booster pump 1 through the water supply pipeline 6, the portable water supply barrel 5 can provide different volumes according to the test water consumption requirements, and the portable water supply barrel 5 can specifically be: a portable water supply plastic barrel.

[0068] The micro booster pump 1 is the core component of the device, with a maximum head of 10m, and can provide a constant water pressure within the range of 0-8m under the regulation of the return water regulating valve;

[0069] The return water regulating valve 4 is a key component of the device. When it is fully closed, the water supply system provides the highest water pressure. The valve opening is finely adjusted according to the test pressure, and the water pressure can be adjusted steplessly with an accuracy of 1mm.

[0070] The pressure stabilizing container 9 is also a key component of the device, and its function is to regulate the pulsating water pressure in the water outlet pipeline 2;

[0071] Its working principle is: close the return water regulating valve 4, start the micro booster pump 1, water will flow into the water outlet pipe 2 through the water supply pipe 6, enter the pressure stabilizing container 8 through the water valve 7, open the exhaust valve 11 to discharge the gas in the pressure stabilizing container, then close the exhaust valve 11, open the valve 13 to pass water for penetration test. Then adjust the return water regulating valve 4 according to the test water pressure to achieve fine adjustment of the system water pressure. Generally, before the penetration damage occurs, the water pressure in each level of adjustment test is always kept constant.

[0072] After the test, turn off micro booster pump 1, and then close other valves in sequence.

[0073] The embodiment of the present invention makes full use of the principle of pressure regulation by adjusting the amount of water in the pipeline backflow, and can provide a water supply device with a head pressure accurate to 1mm and a maximum water level of 8m. Different pressure outputs can be achieved through slight adjustments of the return water regulating valve 4. Compared with the prior art, it has obvious advantages. Due to its small footprint, it does not require an external stable water source, is compact, and easy to install. The whole device is portable and can be connected to a permeameter or an in-situ permeability sample. It can realize the permeability test of weakly permeable soil or rock samples under low pressure conditions, making it possible to conduct permeability tests in field tunnels where water supply is difficult; and multiple water supply devices can be arranged at the same time in the laboratory or in the field, so that multiple groups of tests can be carried out at the same time, greatly improving work efficiency; constant pressure test water supply is not affected by the water source, and the water supply flow and water pressure can be adjusted arbitrarily within a certain range, realizing small flow constant pressure water supply, and greatly improving the reliability of the test; the water pressure stability accuracy is less than 1mm, which improves the test accuracy.

[0074] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A portable small flow constant pressure test water supply device, characterized in that: include: Portable water storage devices, micro pressure regulating devices and pressure stabilizing devices; The portable water storage device is connected to one end of the micro pressure regulating device through a water supply pipeline; the portable water storage device is used to transport water to the micro pressure regulating device through the water supply pipeline under the water pressure provided by the micro pressure regulating device; The other end of the micro pressure regulating device is connected to one end of the pressure stabilizing device through a water outlet pipeline; the micro pressure regulating device is used to provide water pressure and adjust the water pressure to obtain a small flow constant pressure head, and transport the small flow constant pressure head to the pressure stabilizing device through the water outlet pipeline; The pressure stabilizing device is used to regulate the pulsating water pressure in the water outlet pipeline; output the regulated small flow constant pressure water head or transport the regulated small flow constant pressure water head to the permeameter through the connecting pipeline; The micro pressure regulating device comprises: a micro booster pump and a return water regulating valve; One end of the micro booster pump is connected to the portable water storage device through a water supply pipeline, and the other end is connected to the pressure stabilizing device through a water outlet pipeline; the micro booster pump is used to provide water pressure; The return water regulating valve is installed on the return water pipeline; one end of the return water pipeline is connected to the water inlet pipeline, and the other end is connected to the water outlet pipeline; the return water regulating valve is used to adjust the water pressure provided by the micro booster pump to obtain a small flow constant pressure water head, so that the micro booster pump delivers the small flow constant pressure water head to the pressure stabilizing device through the water outlet pipeline; The pressure stabilizing device comprises a pressure stabilizing container, a pressure gauge, an exhaust pipe and an exhaust valve; One end of the pressure-stabilizing container is connected to the micro pressure-regulating device through a water outlet pipeline; the other end is connected to the permeameter through a connecting pipeline; The pressure-stabilizing container is provided with a pressure gauge, and an exhaust pipe and an exhaust valve are provided on the top; The micro pressure regulating device is also used to perform stepless regulation of water pressure; The pressure-stabilizing container is specifically a cylindrical organic glass barrel.

2. The portable small flow constant pressure test water supply device according to claim 1 is characterized in that: The portable water storage device is a plastic bucket.

3. The portable small flow constant pressure test water supply device according to claim 1 is characterized in that: A valve is arranged on the connecting pipeline connecting the pressure stabilizing device and the permeameter; a water valve is arranged on the water outlet pipeline connecting the micro pressure regulating device and the pressure stabilizing device.

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