CN113920828A - Controllable variable-pressure unsteady flow water supply experimental device - Google Patents
Controllable variable-pressure unsteady flow water supply experimental device Download PDFInfo
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Abstract
The invention discloses a controllable variable-pressure unsteady flow water supply experimental device, and belongs to the technical field of laboratory high-speed water flow impact experiments. After the pressure automatic control device receives signals of pressure sensors distributed on the experimental water inlet pipe, the air compression machine, the high-pressure air storage tank, the air inlet valve and the exhaust valve are automatically controlled to work in a cooperative mode, so that the high-pressure air is automatically supplemented when the pressure head of the water inlet pipe is reduced, and the high-pressure air is automatically discharged when the pressure head is increased, and the controllability of the high-speed water flow pressure head in the experiment is realized. The linkage of the experiment water inlet valve, the blowdown valve and the automatic inflation device is realized through the automatic pressure control device so as to supply high-pressure high-speed water flow with controllable flow, and the requirement of a hydraulic impact experiment on the high-speed water flow is met. On the premise of meeting the high-pressure water supply requirement of the model experiment, the high-pressure high-speed unsteady flow in the preset flow change process can be provided, so that the requirements of the model experiment on high-pressure high-speed water flow in various experimental scenes are met.
Description
Technical Field
The invention relates to the technical field of laboratory high-speed water flow impact experiments, in particular to a controllable variable-pressure unsteady flow water supply experimental device.
Background
In actual field scientific research work, due to the limitation of some technical problems, effective research measures are difficult to establish on the field, and a corresponding experimental model needs to be established in a laboratory for mechanism research. With the deep development of research, the research of a hydraulic impact experiment needs to be carried out by utilizing high-pressure high-speed water flows under different pressures in model research of more and more scientific problems, and the stability of a high-pressure high-speed water flow pressure head is guaranteed by providing a stable pressure head so as to guarantee the accuracy of model experiment data. The conventional laboratory water supply device can only provide constant water flow under normal pressure or high pressure, a pressure water head is difficult to keep constant, and high-speed water flow in a preset flow change process cannot be provided.
Disclosure of Invention
The invention aims to provide a controllable variable-pressure unsteady flow water supply experimental device for solving the problem that a conventional experimental device cannot provide stable high pressure and water flow with preset flow change.
In order to achieve the purpose, the invention adopts the following technical scheme:
a controllable variable-pressure unsteady flow water supply experimental device comprises an underground water tank, a water pump, a water tank inlet valve, a water tank inlet pipe, a pressure water tank, an experimental inlet valve, an experimental inlet pipe, an experimental model, an experimental drain valve and an experimental drain pipe; the experimental water inlet valve is arranged on the experimental water inlet pipe, the experimental drain valve is arranged on the experimental drain pipe, and a water outlet at the bottom side of the pressure water tank is communicated with the experimental water inlet pipe; the upper part of the pressure water tank is connected with an air inlet pipe, the air inlet pipe is Y-shaped and forked and is respectively connected with an air inlet valve and an air outlet valve, and one end of the air inlet pipe, which is connected with the air inlet valve, is sequentially connected with a high-pressure air storage tank and an air compressor; the water pump water suction pipe is connected with the underground water tank, the water tank water inlet valve is installed on the water tank water inlet pipe, two ends of the water tank water inlet pipe are respectively connected to the water pump and the pressure water tank, and the water outlet of the experimental drain valve is connected to the underground water tank.
Preferably, the air compressor, the air inlet valve, the exhaust valve, the pressure sensor, the water pump, the water tank inlet valve and the experiment inlet valve are respectively connected with the automatic pressure control device.
Preferably, the air compressor, the air inlet valve, the exhaust valve, the pressure sensor, the water pump, the water tank inlet valve and the experiment inlet valve are respectively connected with the automatic pressure control device.
Preferably, the automatic pressure control device can automatically adjust the air compressor, the high-pressure air storage tank, the air inlet valve and the exhaust valve to work cooperatively after receiving a signal of the pressure sensor, so that the automatic high-pressure air supplement when the pressure head of the experiment water inlet pipe is reduced and the automatic high-pressure air discharge when the pressure is increased are realized, and the controllability of the high-speed water flow pressure head in the experiment is ensured.
Preferably, the gas pressure in the high-pressure gas storage tank is greater than the gas pressure in the pressure water tank.
Preferably, the high-speed water flow value in the flow change process is preset in the automatic pressure control device, the high-pressure high-speed water flow in the flow change process is provided, and the requirement of the hydraulic impact model on the high-pressure high-speed water flow is met.
Preferably, the pressure water tank is close to the top side and installs the overflow pipe with the underground water pond intercommunication, install the overflow valve on the overflow pipe, the blow off pipe is installed to the pressure water tank bottom, install the blowoff valve on the blow off pipe, pressure automatic control device blowoff valve connects.
Compared with the prior art, the invention provides a controllable variable-pressure unsteady flow water supply experimental device, which has the following beneficial effects:
the automatic pressure control device is used for automatically controlling the air compressor, the high-pressure air storage tank, the air inlet valve and the air outlet valve to jointly act to regulate high-pressure air in the pressure water tank so as to realize controllable and variable high-pressure water flow pressure head in an experiment. By utilizing the automatic pressure control device, the automatic high-pressure gas supplement when the pressure of the experimental water inlet pipe is reduced and the automatic high-pressure gas discharge when the pressure is increased are realized, so that the stability of the experimental water flow pressure is ensured. The automatic pressure control device can also automatically adjust the cooperative work of the water pump, the water inlet valve of the water tank, the experiment water inlet valve and the blow-down valve according to the preset pressure and flow change process, so that the high-pressure high-speed water flow in the preset flow change process is realized, and the automatic pressure control device plays an important role in solving the model experiment with the requirement of stabilizing the high-pressure high-speed water flow.
Drawings
FIG. 1 is a schematic view of a normal pressure laboratory water supply apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic view of an air charging device according to an embodiment of the experimental apparatus for supplying water with variable pressure and non-constant flow;
FIG. 3 is a schematic diagram of a laboratory high pressure water supply apparatus according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a laboratory high-pressure water supply device with an automatic pressure control device according to an embodiment of the experimental device for supplying water with variable pressure and non-constant flow.
Description of the figure numbers: 1. an air compressor; 2. a high pressure gas storage tank; 3. an air inlet pipe; 4. an intake valve; 5. an exhaust valve; 6. a pressure water tank; 7. an overflow pipe; 8. an overflow valve; 9. an underground water pool; 10. a water pump; 11. a water tank inlet valve; 12. a water inlet pipe of the water tank; 13. a pressure sensor; 14. an experiment water inlet valve; 15. an experimental water inlet pipe; 16. an experimental model; 17. an experimental drain valve; 18. an experimental drain pipe; 19. a blowoff valve; 20. a blow-off pipe; 21. automatic pressure control device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example 1:
the utility model provides a controllable vary voltage unsteady flow water supply experimental apparatus, includes: the underground water tank 9, the water pump 10, the water tank inlet valve 11, the water tank inlet pipe 12, the pressure water tank 6, the pressure sensor 13, the experiment inlet valve 14, the experiment inlet pipe 15, the experiment model 16, the experiment drain valve 17 and the experiment drain pipe 18 are sequentially connected; the air compressor 1 and the high-pressure air storage tank 2 are connected with the pressure water tank 6 through an air inlet pipe 3, and the automatic pressure control device 21 is respectively connected with the air compressor 1, the high-pressure air storage tank 2, an air inlet valve 4, an exhaust valve 5, a water pump 10, a water tank water inlet valve 11, an experiment water inlet valve 14, a blow-down valve 19 and a pressure sensor 13.
The embodiment is suitable for the working condition of controllable variable-pressure high-speed water flow water supply. The conventional laboratory normal pressure water supply device is designed as shown in fig. 1, and water flow is conveyed to a pressure water tank 6 from an underground water tank 9 through a water tank inlet pipe 12 by a water pump 10. The top of the pressure water tank 6 is free liquid level, so the pressure at the experimental water inlet pipe 15 is the static pressure generated by the water depth. For the working condition of controllable high-pressure constant high-speed water flow water supply, the upper part of the pressure water tank 6 can be sealed, and the pressure water tank 6 is inflated and pressurized by the inflating device. As shown in fig. 2, the inflator mainly includes an air compressor 1, a high-pressure air tank 2, an air inlet pipe 3, an air inlet valve 4, and an air outlet valve 5. When a controllable high-pressure high-speed water flow water supply experiment is carried out, the pressure water tank 6 can be inflated by the inflating device so as to improve the pressure water head of the experimental water inflow, and then a high-pressure hydraulics experiment can be carried out, wherein the high-pressure water supply device is shown in fig. 3.
Before the experiment begins, the water pump 10 is started, water of a certain depth is injected into the pressure water tank 6, a mode of counter potential water injection is adopted, and gas in the pressure water tank 6 is prevented from entering the experiment water inlet pipe 15 in the experiment process. The pressure head and flow rate required for the experiment are input to the automatic pressure control device 21. The automatic pressure control device 21 automatically opens the air compressor 1 and the intake valve 4 by a command, and fills a predetermined amount of air into the pressure tank 6. Then the blowdown valve 19 and the experiment water inlet valve 14 are opened, and the flow rate of the water flow in the experiment water inlet pipe 15 is adjusted to the flow rate required by the model experiment. When the water flow in the experiment water inlet pipe 15 reaches a stable state, the hydraulic experiment of high-pressure constant high-speed water flow can be carried out.
In the experiment process, the pressure of water flow in the experiment water inlet pipe 15 is monitored by the automatic pressure control device 21, and the corresponding valve and the air charging device are adjusted to meet the requirement of the model experiment on the stable pressure of high-speed constant water flow. The experimental device for controllable variable pressure non-constant flow water supply with the automatic pressure control device 21 is shown in fig. 4. A pressure sensor 13 is arranged on the experimental water inlet pipe 15, and an automatic pressure control device 21 is mainly used for monitoring a pressure head of high-speed water flow at the inlet of the experimental water inlet pipe 15 and cooperatively controlling the air compressor 1, the air inlet valve 4, the exhaust valve 5, the experimental water inlet valve 14, the blow-down valve 19 and the water pump 10. The specific working mode is as follows: (1) when the automatic pressure control device 21 monitors that the value of the pressure sensor 13 is lower than the experimental requirement, the air inlet valve 4 is firstly opened, and the gas in the high-pressure gas storage tank 2 enters the pressure water tank 6 under the action of pressure so as to improve the water flow pressure in the experimental water inlet pipe 15. And when the water flow pressure is restored to the range required by the experiment, the air inlet valve 4 is closed, and the automatic pressure control is completed. If the gas in the high-pressure gas storage tank 2 is not enough to lift the water flow pressure in the experiment water inlet pipe 15 to the experiment required pressure range, the automatic pressure control device 21 opens the air compressor 1 to supplement gas for the high-pressure gas storage tank 2, so that the requirement of the model experiment on high-pressure high-speed constant water flow is met. (2) When the automatic pressure control device 21 monitors that the pressure value of the pressure sensor 13 is higher than the pressure required by the experiment, the exhaust valve 5 is opened, and part of air in the pressure water tank 6 is released. When the value of the pressure sensor 13 is restored to the experimentally required pressure range, the exhaust valve 5 is closed. The working condition is suitable for a hydraulics experiment working condition with higher requirement on the stability of the constant inflow pressure water head.
Example 2:
the invention is suitable for the high-speed water flow experiment working condition with controllable pressure change. Before the start of the experiment, a pressure head and a flow rate curve required for the experiment are input to the automatic pressure control device 21. The automatic pressure control device 21 automatically opens the air compressor 1 and the intake valve 4 by a command, and fills the pressure tank 6 with gas satisfying a pressure requirement. The automatic pressure control device 21 can provide high-pressure high-speed water flow with preset variation process in three ways during the experiment process: (1) adjusting the flow in the water inlet pipe 12 of the water tank to be the final flow of the experiment before the experiment begins, opening the experiment water inlet valve 14 and closing the blow-down valve 19 through instructions in the experiment process so as to achieve the final flow required by the experiment, wherein the air inlet valve 4 does not act in the process; (2) adjusting the flow of a water inlet pipe 12 of a water tank to be initial flow of an experiment before the experiment starts, increasing the power of a water pump 10 to the power required by the maximum flow through an instruction in the experiment process, and simultaneously opening an experiment water inlet valve 14 to achieve high-pressure high-speed water flow required by the experiment; (3) before the experiment begins, the flow of the water flow in the water inlet pipe 12 of the water tank is adjusted to be larger than the final flow of the experiment, and the water inlet valve 11 and the air inlet valve 4 of the water tank are opened through instructions in the experiment process. When the automatic pressure control device 21 monitors that the value of the pressure sensor 13 is lower than the experimental requirement, the air inlet valve 4 is firstly opened, and the gas in the high-pressure gas storage tank 2 enters the pressure water tank 6 under the action of pressure so as to improve the water flow pressure in the experimental water inlet pipe 15. And when the water flow pressure is restored to the range required by the experiment, the air inlet valve 4 is closed, and the automatic pressure control is completed. If the gas in the high-pressure gas storage tank 2 is not enough to lift the water flow pressure in the experiment water inlet pipe 15 to the experiment required pressure range, the automatic pressure control device 21 opens the air compressor 1 to supplement air to the high-pressure gas storage tank 2 so as to ensure that the pressure of high-speed water flow fluctuates in a reasonable range, and the requirement of a model experiment on high-pressure high-speed non-constant water flow is met.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (7)
1. A controllable variable-pressure unsteady flow water supply experimental device comprises an underground water pool (9), a water pump (10), a water tank inlet valve (11), a water tank inlet pipe (12), a pressure water tank (6), an experiment inlet valve (14), an experiment inlet pipe (15), an experiment model (16), an experiment drain valve (17) and an experiment drain pipe (18); the method is characterized in that: the automatic experiment water inlet valve device is characterized by further comprising an automatic pressure control device (21), the experiment water inlet pipe (15) is connected to a water inlet of the experiment model (16), the experiment water outlet pipe (18) is connected to a water outlet of the experiment model (16), the experiment water inlet valve (14) is installed on the experiment water inlet pipe (15), the experiment water drain valve (17) is installed on the experiment water outlet pipe (18), a water outlet at the bottom side of the pressure water tank (6) is communicated with the experiment water inlet pipe (15), and a pressure sensor (13) is installed on the experiment water inlet pipe (15) between the experiment water inlet valve (14) and the pressure water tank (6); the top of the pressure water tank (6) is connected with an air charging device, and the air charging device comprises an air compressor (1), a high-pressure air storage tank (2), an air inlet pipe (3), an air inlet valve (4) and an air outlet valve (5); the upper part of the pressure water tank (6) is connected with an air inlet pipe (3), the air inlet pipe (3) is Y-shaped and is respectively connected with an air inlet valve (4) and an air outlet valve (5), and one end of the air inlet pipe (3) connected with the air inlet valve (4) is sequentially connected with a high-pressure air storage tank (2) and an air compressor (1); the water pump (10) is connected with the underground water tank (9), the water tank inlet valve (11) is installed on the water tank inlet pipe (12), and the two ends of the water tank inlet pipe (12) are connected to the water pump (10) and the pressure water tank (6) respectively.
2. The experimental device for the controllable variable-pressure non-constant-flow water supply according to claim 1, characterized in that: the air compressor (1), the air inlet valve (4), the exhaust valve (5), the pressure sensor (13), the water pump (10), the water tank inlet valve (11) and the experiment inlet valve (14) are respectively and electrically connected with the automatic pressure control device (21).
3. The experimental device for the controllable variable-pressure non-constant-flow water supply according to claim 2, characterized in that: the automatic pressure control device (21) can automatically adjust the cooperative work of the air compressor (1), the high-pressure air storage tank (2), the air inlet valve (4) and the air outlet valve (5) after receiving a signal of the pressure sensor (13), and automatically supplements high-pressure gas when the water flow pressure of the experiment water inlet pipe (15) is reduced and automatically discharges the high-pressure gas when the pressure is increased.
4. The experimental device for the controllable variable-pressure non-constant-flow water supply according to claim 3, characterized in that: the gas pressure in the high-pressure gas storage tank (2) is larger than that in the pressure water tank (6).
5. The experimental device for the controllable variable-pressure non-constant-flow water supply according to claim 4, wherein: the high-speed water flow value in the flow change process is preset in the automatic pressure control device (21), high-pressure high-speed water flow in the flow change process is provided, and the requirement of the hydraulic impact model on the high-pressure high-speed water flow is met.
6. The experimental device for the controllable variable-pressure non-constant-flow water supply according to claim 5, wherein: the pressure water tank (6) is close to the top side edge and is provided with an overflow pipe (7) communicated with an underground water pool (9), and the overflow pipe (7) is provided with an overflow valve (8).
7. The experimental device for the controllable variable-pressure non-constant-flow water supply according to claim 6, characterized in that: the automatic pressure control device is characterized in that a drain pipe (20) is installed at the bottom end of the pressure water tank (6), a drain valve (19) is installed on the drain pipe (20), and the automatic pressure control device (21) is electrically connected with the drain valve (19).
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