CN113309182A - Blade energy dissipation type stable liquid level adjustable water tank for pipeline transient flow - Google Patents
Blade energy dissipation type stable liquid level adjustable water tank for pipeline transient flow Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 281
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- 230000021715 photosynthesis, light harvesting Effects 0.000 title claims abstract description 49
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- 239000012530 fluid Substances 0.000 claims description 10
- 230000007246 mechanism Effects 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 5
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B5/00—Use of pumping plants or installations; Layouts thereof
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B11/00—Arrangements or adaptations of tanks for water supply
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B11/00—Arrangements or adaptations of tanks for water supply
- E03B11/02—Arrangements or adaptations of tanks for water supply for domestic or like local water supply
- E03B11/06—Arrangements or adaptations of tanks for water supply for domestic or like local water supply with air regulators
- E03B11/08—Air regulators
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
- E03B7/071—Arrangement of safety devices in domestic pipe systems, e.g. devices for automatic shut-off
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
- E03B7/075—Arrangement of devices for control of pressure or flow rate
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
- E03B7/078—Combined units with different devices; Arrangement of different devices with respect to each other
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
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Abstract
The invention relates to a blade energy dissipation type stable liquid level adjustable water tank for pipeline transient flow, which comprises a circulating water tank, an overflow water tank and a water collecting pipe, wherein the top of the circulating water tank is connected with the bottom of the overflow water tank; the overflow water tank comprises an outer tank body and an inner tank body arranged in the outer tank body, the lower end of the outer tank body and the lower end of the inner tank body are sealed through a bottom surface, the lower end of the inner tank body is in butt joint with the upper end of the circulating water tank, and the upper end of the inner tank body is lower than the upper end of the outer tank body; the water collecting pipe is arranged below the bottom of the overflow water tank, is arranged around the circumference of the circulating water tank and forms a loop, and is communicated with the bottom surface between the outer tank body and the inner tank body through a plurality of connecting pipes; the water collecting pipe is connected with an overflow pipe. The invention can realize high liquid level overflow, and has stable liquid level and small disturbance.
Description
Technical Field
The invention relates to the technical field of hydraulic engineering, in particular to a pressurized pipeline water supply device, and more particularly relates to a blade energy dissipation type stable liquid level adjustable water tank for pipeline transient flow.
Background
In modern hydraulic pipeline systems such as large-scale water delivery and water transfer, heat supply pipe networks and the like, safe and reliable fluid delivery is required. The pressure water pipeline is an important component of the key infrastructures, transient cavitation flow accompanied with rapid change of flow rate and pressure can be generated in the pipeline due to misoperation such as sudden pump stopping, valve closing and the like, and pressure fluctuation of low pressure which is dozens of times or dozens of times of normal working pressure of the pipeline and generated in the transient cavitation flow process can generate great influence on safe and stable operation of a pipeline system and pipeline elements. In the transient cavitation process of the pipeline, complex details and mechanisms such as cavitation phase change, gas-liquid two-phase mass transport, pressure fluctuation and the like are accompanied, so that the knowledge is not sufficient at present, and further deep research is needed.
By using the test method, the transient characteristics of the transient cavitation flow, the evolution of the cavitation flow field and other complex phenomena are researched, and the correction of the existing water hammer calculation model is of great significance. However, due to the particularity of the water hammer test, stable pressure boundary conditions must be provided upstream and downstream thereof to generate a stable flow state. Moreover, in order to generate different flow speed working conditions in the pipe, the boundary conditions of the upstream pressure and the downstream pressure need to be changed, which means that the liquid level of the water tank needs to be changed. The existing overflow water tank has unstable flow, strong disturbance or insufficient liquid level height, can not adjust the liquid level of the water tank according to the requirement, and has great defects.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a blade energy dissipation type stable liquid level adjustable water tank for pipeline transient flow, which can realize high liquid level overflow, stable liquid level and small disturbance.
In order to achieve the purpose, the invention adopts the following technical scheme:
the blade energy dissipation type stable liquid level adjustable water tank for pipeline transient flow comprises a circulating water tank, an overflow water tank and a water collecting pipe, wherein the top of the circulating water tank is connected with the bottom of the overflow water tank; the overflow water tank comprises an outer tank body and an inner tank body arranged in the outer tank body, the lower end of the outer tank body and the lower end of the inner tank body are sealed through a bottom surface, the lower end of the inner tank body is in butt joint with the upper end of the circulating water tank, and the upper end of the inner tank body is lower than the upper end of the outer tank body; the water collecting pipe is arranged below the bottom of the overflow water tank, is arranged around the circumference of the circulating water tank and forms a loop, and is communicated with the bottom surface between the outer tank body and the inner tank body through a plurality of connecting pipes; the water collecting pipe is connected with an overflow pipe.
The blade energy dissipation type stable liquid level adjustable water tank for pipeline transient flow preferably further comprises a variable frequency water supply pump, a water storage tank and a water inlet pipe assembly, wherein a water inlet of the variable frequency water supply pump is connected with the water storage tank through a water pumping pipe, a water outlet of the variable frequency water supply pump is connected with one end of the water inlet pipe assembly, and the other end of the water inlet pipe assembly penetrates through the side wall of the circulating water tank and extends into the overflow water tank; the overflow pipe is communicated with the water storage tank.
The blade energy dissipation type stable liquid level adjustable water tank for pipeline transient flow is characterized in that preferably, the water inlet pipe assembly comprises an inverted L-shaped water outlet pipe, a horizontal water inlet pipe and a vertical water outlet pipe, a first flange is arranged at the first end of the water outlet pipe, and the water outlet pipe is connected with a water outlet of the variable-frequency water supply pump through the first flange; a second flange is arranged at the second end of the pump-out water pipe, a third flange is arranged at the first end of the horizontal water inlet pipe, an intermediate flange is arranged between the second flange and the third flange, and the second end of the pump-out water pipe is connected with the first end of the horizontal water inlet pipe through the second flange, the intermediate flange and the third flange; the second end of the horizontal water inlet pipe is connected with the first end of the vertical water outlet pipe through a 90-degree elbow, and the 90-degree elbow and the horizontal water inlet pipe are fixed through a hoop; and the second end of the vertical water outlet pipe extends into the inner box body of the overflow water tank.
The blade energy dissipation type stable liquid level adjustable water tank for pipeline transient flow preferably further comprises a first fixing frame, the first fixing frame is arranged at an opening at the upper end of the circulating water tank, and the end part of the first fixing frame is connected with the outer edge of the upper end of the circulating water tank; the first fixing frame is used for fixing the vertical water outlet pipe.
The blade energy dissipation type stable liquid level adjustable water tank for pipeline transient flow preferably further comprises a second fixing frame and an energy dissipation water baffle, wherein the second fixing frame is fixedly arranged at an opening at the upper end of the outer tank body of the overflow water tank; the energy dissipation water baffle is rotatably hung on the second fixing frame through a hanging mechanism and is positioned above the water outlet of the vertical water outlet pipe.
The blade energy dissipation type stable liquid level adjustable water tank for pipeline transient flow preferably comprises a main shaft and a flange bearing, wherein a boss is arranged at the central position of the upper end of the energy dissipation water baffle, the flange bearing is fixedly arranged on the boss, and the lower end of the main shaft is connected with an inner ring of the flange bearing through interference fit.
The blade energy dissipation type stable liquid level adjustable water tank for pipeline transient flow preferably comprises an umbrella-shaped rear cover plate and backward-bent cylindrical blades, wherein the backward-bent cylindrical blades are circumferentially arranged on the umbrella-shaped rear cover plate around the center of the umbrella-shaped rear cover plate.
The blade energy dissipation type stable liquid level adjustable water tank for the pipeline transient flow is preferably designed by the following steps:
1) calculating the pressure energy H which can be consumed by the energy dissipation water baffle impeller through a formula (1):
in the formula, R2The exit radius, R, of the backward-curved cylindrical blade1Is the inlet radius of the backward-curved cylindrical blade, and omega is the angular velocity; c is a gap-related coefficient, and c takes the following values:
wherein, delta is a gap between the backward bent cylindrical blade and the umbrella-shaped back cover plate;
determining the diameter D of the inlet and the outlet of the energy dissipation water baffle impeller according to the formula (1) and the required lift of the overflow water tank1，D2Selecting backward-bent cylindrical blades, wherein the number of the backward-bent cylindrical blades ranges from 4 to 10;
2) calculating the axial thrust of water according to a fluid mechanics momentum equation (2), determining the shaft diameter according to the rotation torque and the allowable stress of the material, and checking the strength of the main shaft:
∑Fy＝ρqv(v2y-v1y) (2)
in the formula, FyIs the axial thrust borne by the main shaft, rho is the fluid density, qvIs the flow rate, v2yAnd v1yRespectively the inlet and outlet flow velocity of the impeller of the energy dissipation water baffle.
The blade energy dissipation type stable liquid level adjustable water tank for pipeline transient flow preferably further comprises a non-contact liquid level meter and a PLC (programmable logic controller), wherein the non-contact liquid level meters are arranged on the second fixing frame, and the PLC is respectively and electrically connected with the variable-frequency water supply pump and the non-contact liquid level meter.
The blade energy dissipation type stable liquid level adjustable water tank for pipeline transient flow is characterized in that preferably, the lower end of the circulating water tank is a gradually reduced flow channel and forms a water outlet, and the water outlet is connected with a water outlet pipeline.
Due to the adoption of the technical scheme, the invention has the following advantages:
(1) the variable-frequency water supply pump, the circulating water tank and the overflow water tank are matched for use, so that high liquid level overflow can be ensured on the basis of larger overflow amount, and stable flow is provided for a pipeline;
(2) the semi-open impeller energy dissipation water baffle formed by the backward bent cylindrical blades and the umbrella-shaped back cover plate has the advantages of sufficient energy dissipation, stable flow, small flow state disturbance and little influence on overflow and outflow flow states;
(3) the inlet of the water supply pipe is connected by a flange, the horizontal water supply pipe and the vertical water supply pipe are connected by a 90-degree elbow, and the vertical water supply pipe is fixed by a first fixing frame of a cross structure in the circulating water tank, so that the bearing is strong, the fixing is stable, the occupied space is small, and the influence on the flow is small;
(4) and a liquid level automatic regulating system consisting of a non-contact liquid level meter, a PLC (programmable logic controller) and a variable-frequency water supply pump is used for regulating the liquid level in the circulating water tank in real time.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is a schematic view showing a connection structure of a pump outlet pipe and a horizontal inlet pipe in FIG. 1;
figure 4 is a schematic structural view of the energy-dissipating water baffle of figure 1;
FIG. 5 is a side view of FIG. 4;
fig. 6 is a schematic structural view of a flange bearing.
The reference numerals in the figures are as follows:
1-variable frequency water supply pump; 2-pumping out a water pipe; 3-horizontal water inlet pipe; 4, clamping a hoop; 5-90 degree elbow; 6-vertical water outlet pipe; 7-a first fixing frame; 8-energy dissipation water baffle; 9-flange bearing; 10-a main shaft; 11-a second mount; 12-a non-contact level gauge; 13-an overflow water tank; 14-a water collecting pipe; 15-overflow pipe; 16-a water storage tank; 17-a water pumping pipe; 18-a PLC controller; 19-a circulating water tank; 20-a water outlet pipeline; 21-a first flange; 22-a second flange; 23-a third flange; 24-an intermediate flange; 25-a boss; 26- "umbrella" back shroud; 27-backward bending the cylindrical blade; 28-inner bearing ring; 29-rolling elements; 30-a bearing outer ring; 31-flange body.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.
As shown in fig. 1 and 2, the blade energy dissipation type stable liquid level adjustable water tank for pipeline transient flow provided by the invention comprises a circulating water tank 19, an overflow water tank 13 and a water collecting pipe 14, wherein the top of the circulating water tank 19 is connected with the bottom of the overflow water tank 13, the top of the circulating water tank 19 is turned outwards to form an outer edge, the overflow water tank 13 comprises an outer tank body and an inner tank body arranged in the outer tank body, the lower end of the outer tank body and the lower end of the inner tank body are sealed by a bottom surface, and the outer edge of the circulating water tank 19 and the bottom surface of the lower end of the outer tank body are fixedly connected by bolts; the lower end of the inner box body is butted with the upper end of the circulating water tank, and the upper end of the inner box body is lower than the upper end of the outer box body; the water collecting pipe 14 is arranged below the bottom of the overflow water tank 13, the water collecting pipe 14 is circumferentially arranged around the circulating water tank 19 to form a loop, and the water collecting pipe 14 is communicated with the bottom surface between the outer tank body and the inner tank body through a plurality of connecting pipes; an overflow pipe 15 is connected to the water collection pipe 14.
In the above embodiment, preferably, the present invention further comprises a variable frequency water supply pump 1, a water storage tank 16 and a water inlet pipe assembly, wherein a water inlet of the variable frequency water supply pump 1 is connected with the water storage tank 16 through a water pumping pipe 17, a water outlet of the variable frequency water supply pump 1 is connected with one end of the water inlet pipe assembly, and the other end of the water inlet pipe assembly passes through the side wall of the circulation water tank 19 and extends into the overflow water tank 13; the overflow pipe 15 communicates with the storage tank 16.
In the above embodiment, preferably, as shown in fig. 2 and 3, the water inlet pipe assembly comprises an inverted L-shaped water outlet pipe 2, a horizontal water inlet pipe 3 and a vertical water outlet pipe 6, a first flange 21 is provided at a first end of the water outlet pipe 2, and the water outlet pipe 2 is connected with the water outlet of the variable frequency water supply pump 1 through the first flange 21; a second flange 22 is arranged at the second end of the water outlet pipe 2, a third flange 23 is arranged at the first end of the horizontal water inlet pipe 3, an intermediate flange 24 is arranged between the second flange 22 and the third flange 23, and the second end of the water outlet pipe 2 is connected with the first end of the horizontal water inlet pipe 3 through the second flange 22, the intermediate flange 24 and the third flange 23; specifically, the second flange 22, the intermediate flange 24 and the third flange 23 are connected by bolts and nuts; the second end of the horizontal water inlet pipe 3 is connected with the first end of the vertical water outlet pipe 6 through a 90-degree elbow 5, and the 90-degree elbow and the horizontal water inlet pipe 3 are fixed through a hoop 4; the second end of the vertical outlet pipe 6 extends into the inner box body of the overflow water tank 13, so that fluid vertically enters the overflow water tank, the side wall of the overflow water tank 13 is prevented from being directly impacted, and the influence on the flow state in the overflow water tank 13 is reduced.
In the above embodiment, preferably, the present invention further includes a first fixing frame 7, the first fixing frame 7 is a cross structure, the first fixing frame 7 is disposed at the opening at the upper end of the circulating water tank 19, and the end of the first fixing frame 7 is connected to the outer edge of the upper end of the circulating water tank 19; the first fixing frame 7 is used for fixing the vertical water outlet pipe 6.
In the above embodiment, preferably, as shown in fig. 2, 4 and 5, the present invention further includes a second fixing frame 11 and an energy dissipation water baffle 8, the second fixing frame 11 is fixedly disposed at an opening at an upper end of the outer tank of the overflow water tank 13, and the second fixing frame 11 is of a cross structure; the energy dissipation water baffle 8 is rotatably hung on the second fixing frame 11 through a hanging mechanism and is positioned above the water outlet of the vertical water outlet pipe 6. The distance between the lowest point of the energy dissipation water baffle 8 and the outlet of the vertical water outlet pipe 6 is about 5 times of pipe diameter, the area is about 2 times of the cross section of the vertical water supply pipe 6, on one hand, a good energy dissipation effect is generated, on the other hand, the phenomenon that the distance is too close to generate overlarge impact on the water baffle and generate a jet effect to influence the flow state is avoided; the pressure water flow flowing out of the vertical water supply pipe 6 impacts the semi-open impeller energy dissipation water baffle 8 in the vertical direction, fluid pressure energy and kinetic energy are converted into mechanical energy of the water baffle, energy dissipation is carried out, and the water baffle rotates around the main shaft 10.
In the above embodiment, preferably, the hanging mechanism includes a main shaft 10 and a flange bearing 9, a boss 25 is provided at the central position of the upper end of the energy dissipation water baffle 8, the flange bearing 9 is fixedly provided on the boss 25, and the lower end of the main shaft 10 is connected with the inner ring of the flange bearing 9 through interference fit.
As shown in fig. 6, the flange bearing 9 includes a bearing inner ring 28, a rolling body 29, a bearing outer ring 30, and a flange body 31, a lower end of the bearing outer ring 30 is fixed to an upper end surface of the flange body 31, and the bearing inner ring 28 and the bearing outer ring 30 are rotatably connected by the rolling body 29.
In the above embodiment, preferably, the energy dissipater baffle comprises an "umbrella" back cover plate 26 and a plurality of backward curved cylindrical blades 27 circumferentially arranged around the centre of the "umbrella" back cover plate 26 on the "umbrella" back cover plate 26.
In the above embodiment, preferably, the present invention further includes a non-contact liquid level meter 12, and a plurality of non-contact liquid level meters 12 are disposed on the second fixing frame 11.
In the above embodiment, preferably, the present invention further comprises a PLC controller 18, and the PLC controller 18 is electrically connected to the variable frequency water supply pump 1 and the non-contact level gauge 12, respectively.
In the above embodiment, preferably, the lower end of the circulation water tank 19 is a tapered flow channel and forms a water outlet with a contraction ratio of 6.67, the water outlet is connected with the water outlet pipe 20, the water flow under the condition of the contraction ratio is uniformly distributed, the turbulence degree is small, and the outflow of the water outlet pipe 20 is accelerated.
The working process of the invention is as follows: since the highest position of the inner tank of the overflow water tank 13 is lower than the outer tank, when the liquid level in the inner tank exceeds the highest liquid level, the fluid will enter the space between the inner tank and the outer tank, so as to reach an overflow state, and after the overflow water enters the space between the inner tank and the outer tank, the overflow water flows into the water collecting pipe 14 through the connecting pipe from the overflow hole on the bottom surface between the inner tank and the outer tank, and is guided out through the overflow pipe 15 and recovered.
Wherein, 4 non-contact level gauges 12 are fixed in the circumferencial direction and on the second mount that the distance equals from the water tank center, average 4 non-contact level gauges 12's data at the same moment and get real-time circulation water tank internal liquid level, and with liquid level signal transmission to PLC controller 18, PLC controller 18 is programmable controller, PLC controller 18 receives the liquid level signal, and compare with the value of settlement, and output pulse signal adjusts frequency conversion water supply pump 1 rotational speed, use circulation water tank liquid level as input signal through the above, use frequency conversion water supply pump 1 rotational speed as output signal, carry out PID (proportion-integral-differential) closed loop control to the water tank liquid level.
It should be noted that: the energy dissipation water baffle is designed by the following steps:
1) calculate the pressure energy H that energy dissipation breakwater impeller (the structure that several back bending cylindrical blade enclose promptly) can consume through formula (1):
in the formula, R2Is the radius of the outlet of the backward-bent cylindrical blade, R1The radius of the inlet of the backward-bent cylindrical blade, and omega is the angular velocity; c is a gap-related coefficient, and c takes the following values:
in the formula, delta is a gap between the backward bent cylindrical blade and the umbrella-shaped back cover plate;
determining the diameter D of the inlet and the outlet of the energy dissipation water baffle impeller according to the formula (1) and the required lift of the overflow water tank (the height of the maximum liquid level of the overflow water tank)1，D2Selecting backward-bent cylindrical blades, wherein the number of the backward-bent cylindrical blades ranges from 4 to 10.
2) And (3) calculating the axial thrust of water according to a fluid mechanics momentum equation formula (2), determining the shaft diameter according to the rotation torque and the allowable stress of the material, and checking the strength of the main shaft.
∑Fy＝ρqv(v2y-v1y) (2)
In the formula, FyIs the axial thrust borne by the main shaft, rho is the fluid density, qvIs the flow rate, v2yAnd v1yInlet and outlet flow velocities of impeller of energy dissipation water baffle plate。
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A blade energy dissipation type stable liquid level adjustable water tank for pipeline transient flow is characterized by comprising a circulating water tank, an overflow water tank and a water collecting pipe, wherein the top of the circulating water tank is connected with the bottom of the overflow water tank;
the overflow water tank comprises an outer tank body and an inner tank body arranged in the outer tank body, the lower end of the outer tank body and the lower end of the inner tank body are sealed through a bottom surface, the lower end of the inner tank body is in butt joint with the upper end of the circulating water tank, and the upper end of the inner tank body is lower than the upper end of the outer tank body;
the water collecting pipe is arranged below the bottom of the overflow water tank, is arranged around the circumference of the circulating water tank and forms a loop, and is communicated with the bottom surface between the outer tank body and the inner tank body through a plurality of connecting pipes; the water collecting pipe is connected with an overflow pipe.
2. The blade energy dissipation type stable liquid level adjustable water tank for pipeline transient flow as claimed in claim 1, further comprising a variable frequency water supply pump, a water storage tank and a water inlet pipe assembly, wherein a water inlet of the variable frequency water supply pump is connected with the water storage tank through a water pumping pipe, a water outlet of the variable frequency water supply pump is connected with one end of the water inlet pipe assembly, and the other end of the water inlet pipe assembly penetrates through a side wall of the circulating water tank and extends into the overflow water tank;
the overflow pipe is communicated with the water storage tank.
3. The blade energy dissipation type stable liquid level adjustable water tank for pipeline transient flow as claimed in claim 2, wherein the water inlet pipe assembly comprises an inverted L-shaped water outlet pipe, a horizontal water inlet pipe and a vertical water outlet pipe, a first flange is arranged at a first end of the water outlet pipe, and the water outlet pipe is connected with a water outlet of the variable frequency water supply pump through the first flange;
a second flange is arranged at the second end of the pump-out water pipe, a third flange is arranged at the first end of the horizontal water inlet pipe, an intermediate flange is arranged between the second flange and the third flange, and the second end of the pump-out water pipe is connected with the first end of the horizontal water inlet pipe through the second flange, the intermediate flange and the third flange;
the second end of the horizontal water inlet pipe is connected with the first end of the vertical water outlet pipe through a 90-degree elbow, and the 90-degree elbow and the horizontal water inlet pipe are fixed through a hoop;
and the second end of the vertical water outlet pipe extends into the inner box body of the overflow water tank.
4. The blade energy dissipation type stable liquid level adjustable water tank for the pipeline transient flow as claimed in claim 3, further comprising a first fixing frame, wherein the first fixing frame is arranged at the opening at the upper end of the circulating water tank, and the end part of the first fixing frame is connected with the outer edge of the upper end of the circulating water tank; the first fixing frame is used for fixing the vertical water outlet pipe.
5. The blade energy dissipation type stable liquid level adjustable water tank for the pipeline transient flow as claimed in claim 4, further comprising a second fixing frame and an energy dissipation water baffle, wherein the second fixing frame is fixedly arranged at the opening at the upper end of the outer tank body of the overflow water tank; the energy dissipation water baffle is rotatably hung on the second fixing frame through a hanging mechanism and is positioned above the water outlet of the vertical water outlet pipe.
6. The blade energy dissipation type stable liquid level adjustable water tank for pipeline transient flow as claimed in claim 5, wherein the hanging mechanism comprises a main shaft and a flange bearing, a boss is arranged at the central position of the upper end of the energy dissipation water baffle, the flange bearing is fixedly arranged on the boss, and the lower end of the main shaft is connected with the inner ring of the flange bearing through interference fit.
7. The blade energy-dissipating stable liquid level adjustable water tank for pipeline transient flow as claimed in claim 6, wherein the energy-dissipating water baffle comprises an "umbrella-shaped" back cover plate and backward-bent cylindrical blades, and a plurality of the backward-bent cylindrical blades are circumferentially arranged around the center of the "umbrella-shaped" back cover plate on the "umbrella-shaped" back cover plate.
8. The blade energy-dissipating stable liquid level adjustable water tank for pipeline transient flow as claimed in claim 7, wherein the energy-dissipating water baffle is designed by the steps of:
1) calculating the pressure energy H which can be consumed by the energy dissipation water baffle impeller through a formula (1):
in the formula, R2The exit radius, R, of the backward-curved cylindrical blade1Is the inlet radius of the backward-curved cylindrical blade, and omega is the angular velocity; c is a gap-related coefficient, and c takes the following values:
wherein, delta is a gap between the backward bent cylindrical blade and the umbrella-shaped back cover plate;
determining the diameter D of the inlet and the outlet of the energy dissipation water baffle impeller according to the formula (1) and the required lift of the overflow water tank1，D2Selecting backward-bent cylindrical blades, and counting the number of the backward-bent cylindrical bladesThe number of the particles is 4-10;
2) calculating the axial thrust of water according to a fluid mechanics momentum equation (2), determining the shaft diameter according to the rotation torque and the allowable stress of the material, and checking the strength of the main shaft:
∑Fy＝ρqv(v2y-v1y) (2)
in the formula, FyIs the axial thrust borne by the main shaft, rho is the fluid density, qvIs the flow rate, v2yAnd v1yRespectively the inlet and outlet flow velocity of the impeller of the energy dissipation water baffle.
9. The blade energy dissipation type stable liquid level adjustable water tank for pipeline transient flow as claimed in claim 5, further comprising a non-contact type liquid level meter and a PLC controller, wherein a plurality of said non-contact type liquid level meters are arranged on said second fixing frame, and said PLC controller is electrically connected with said variable frequency water supply pump and said non-contact type liquid level meter respectively.
10. The blade energy dissipation type stable liquid level adjustable water tank for pipeline transient flow as claimed in claim 1, wherein the lower end of the circulating water tank is a tapered flow passage and forms a water outlet, and the water outlet is connected with a water outlet pipeline.
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