Pressure tank for coordinating and improving water inflow and outflow conditions of a bidirectional pumping station

Abstract

The application provides a pressure water tank for coordinating and improving water inflow and outflow states of a bidirectional pump station, and relates to the technical field of hydraulic engineering. The pressure water tank can also be used as a reverse water diversion forebay. A short pier is combined with a cylinder to form a porous continuous frame structure in the pressure water tank. A central diffusion angle β of the pressure water tank is reasonably determined as 25-30°, and the underwater volume of the forebay is not less than 80 times of the design flow. The longitudinal slopes of the top plate and the bottom plate of the tank body are appropriately slowed down, and are not steeper than 1:4. The pressure water tank not only solves the problem of flow state disorder of water outflow and water inflow of the reverse forebay, and guarantees safe, efficient and stable operation of the unit, but also reduces the structural span and the engineering quantity, is economic and safe, guarantees good flow states in the pressure water tank under the conditions of drainage and reverse water diversion, and ensures safe, efficient and stable operation of the unit.

Description

Technical Field

[0001] This invention relates to the field of water conservancy engineering technology, specifically to a pressure water tank that coordinates and improves the inlet and outlet flow patterns of a bidirectional pumping station. Background Technology

[0002] Pressure tanks are mostly used in dike-type drainage pumping stations. They are located between the pump house outlet channel and the water conveyance culvert. As a collection tank for the pumping unit, they mainly play the role of energy dissipation and flow stabilization, so that floodwater can be smoothly and evenly transported to the discharge area of ​​the outlet channel through the water conveyance culvert.

[0003] Common pressure tanks have continuous partition walls. For pumping stations with only pumping functions, pressure tanks with continuous partition walls can solve the problem of turbulent outflow. However, for bidirectional dike-type pumping stations with both pumping and reverse water diversion functions, the pressure tank also serves as the forebay for reverse water diversion. Currently, pressure tanks with continuous partition walls are still commonly used in engineering. Although they can ensure a good outflow under flood drainage conditions, under reverse water diversion conditions, the partition walls can obstruct water flow, making it impossible to guarantee a balanced distribution of water in the inlet channels of each unit. This leads to uneven flow velocity, turbulent water flow, and may even generate vortices. Once the vortex enters the pump, it will cause strong vibration of the pump unit, seriously affecting the performance of the unit and the safe operation of the pumping station.

[0004] While pressure tanks without partition walls can solve the problem of turbulent flow in reverse water intake, the drainage water flow is laterally mixed and collided at the end of the channel, which can easily form an undesirable flow pattern, cause unit vibration, reduce pump operating efficiency, and result in a large structural span, high internal forces, safety issues, large engineering workload, and uneconomical operation. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a pressure water tank that coordinates and improves the inlet and outlet flow patterns of a bidirectional pumping station, solving the problem that the pressure water tank cannot guarantee good flow patterns for both forward and reverse water intake.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A pressure water tank for coordinating and improving the inlet and outlet flow patterns of a bidirectional pumping station, the pressure water tank comprising: a tank body, short partitions, and a cylinder;

[0010] The enclosure includes: a constant-width section and a gradually changing section; the constant-width section is connected to the pump house, and the gradually changing section is connected to the water conveyance culvert.

[0011] The short partition is installed sequentially at the end of the flow channel partition wall of the pump room, and the short partition is rigidly fixed to the top and bottom plates of the same width section.

[0012] The cylinders are arranged at equal intervals along the streamline direction of the short partitions, and the cylinders are rigidly connected to the top and bottom plates of the transition section.

[0013] The center diffusion angle β of the enclosure is 25° to 30°.

[0014] The top plate of the box is provided with a longitudinal slope, and the longitudinal slope ratio of the top plate to m1 is not steeper than 1:4;

[0015] The bottom plate of the box is provided with a longitudinal slope, and the longitudinal slope ratio of the bottom plate to m2 is not steeper than 1:4.

[0016] Preferably, the lengths D and L of the equal-width section and the gradually changing section in the direction of water flow are determined based on the central diffusion angle β and in conjunction with the requirement that the underwater volume of the forebay, which also serves as a reverse water intake pool, is not less than 80 times the design water intake flow rate under the minimum water intake condition. The specific formula is as follows:

[0017]

[0018]

[0019] V≥80Q;

[0020] Where Q is the design flow rate for reverse water diversion, in m³ / s. 3 / s;

[0021] V represents the underwater volume of the pressure tank under the lowest reverse priming condition, in cubic meters (m³). 3 ;

[0022] β is the center contraction angle of the pressure tank, which is 25° to 30°;

[0023] B1 is the starting width of the transition section, in meters (m).

[0024] B2 is the width at the end of the transition section, in meters (m).

[0025] L is the length of the transition segment, in meters (m).

[0026] D represents the length of the equal-width section, in meters, and must be no less than 4.0 meters.

[0027] h1 is the water depth under the diaphragm in the equal-width section, in meters;

[0028] h2 is the initial water depth of the transition section, in meters;

[0029] h3 is the water depth at the end of the transition section, in meters;

[0030] h4 represents the height difference between the culvert sill and the pressure water tank sill, in meters (m).

[0031] Preferably, the pump room has a partition plate connected sequentially to the end of the double-layer flow channel partition plate. The length of the partition plate is the same as that of the short partition block, and the thickness of the partition plate is determined according to the structural strength calculation and is not less than 0.5 meters.

[0032] Preferably, the length of the short partition is the same as the length D of the equal-width section, the thickness of the short partition is 0.6 to 1.1 meters, and the planar shape of the short partition is set as a gradually streamlined shape with rounded corners at the ends.

[0033] Preferably, the diameter of the cylinder is not less than 0.8 meters, and the center-to-center distance between adjacent cylinders flowing upstream is 3 times the cylinder diameter.

[0034] Preferably, a vent pipe is installed in the top plate of the box near the pump house side. The bottom end of the vent pipe is connected to the inside of the box, and the top end of the vent pipe is connected to the outside space of the box. The top end of the vent pipe is located in a remote place, separate from the pump station building, and the elevation of the top end of the vent pipe is 2 meters higher than the flood control level on the outer river side. The vent pipe is a stainless steel pipe with a diameter of not less than 0.15 meters, and the number of vent pipes is determined according to the required effective ventilation area.

[0035] Preferably, the top of the box is provided with an entrance well, the top of the entrance well is 0.3 to 0.5 meters above the ground, and the planar dimensions are not less than 0.8 meters * 1.8 meters; the top of the entrance well is provided with a cover plate.

[0036] Preferably, channel steel is fixed around the manhole, and the channel steel is fixed to the cover plate by bolts and nuts, with a rubber waterstop ring installed between the channel steel and the cover plate.

[0037] Preferably, the cover plate is provided with a DN50 automatic exhaust valve and a Z45T-10 gate valve.

[0038] Preferably, the box body, short piers, columns and partitions are all made of reinforced concrete with a concrete strength grade of not less than C25.

[0039] (III) Beneficial Effects

[0040] This invention provides a pressure water tank that coordinates and improves the inlet and outlet flow patterns of a bidirectional pumping station. Compared with the prior art, it has the following advantages:

[0041] In this invention, the pressure tank can also serve as a reverse water diversion forebay. A porous, continuous frame structure is formed within the tank by combining short partitions and cylinders. The short partitions are connected to the ends of the flow channel partitions in the pump house, effectively dividing the water body and ensuring good flow patterns during both drainage and reverse water diversion, avoiding eddies and flow deviations. The cylinders are evenly spaced along the streamline direction of the short partitions in the transition section, minimizing the water-blocking area and maximizing water flow exchange within the tank while meeting structural strength requirements, thus ensuring optimal flow during reverse water diversion. The balanced distribution of water in the inlet channel of the unit ensures efficient and safe operation of the pumps. The center diffusion angle β of the tank is 25° to 30°, which ensures that the water flow does not detach from the tank sidewalls, resulting in smooth water flow without backflow and economical engineering. At the same time, it meets the requirement that the underwater volume of the forebay used for reverse water intake should not be less than 80 times the design flow rate. The longitudinal slope of the top and bottom plates of the tank is appropriately reduced, with neither being steeper than 1:4, ensuring good flow in the pressure tank under both flood drainage and reverse water intake conditions, thus ensuring the safe, efficient and stable operation of the unit. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a horizontal cross-sectional view of the pressure water tank in an embodiment of the present invention;

[0044] Figure 2 This is a longitudinal sectional view of the pressure water tank in an embodiment of the present invention;

[0045] Figure 3 This is a longitudinal cross-sectional view of the entry well in an embodiment of the present invention;

[0046] The reference numerals in the figure are set as follows: box body 10, equal width section 11, gradual change section 12, vent pipe 13, short partition 20, cylinder 21, partition 22, pump house 30, water conveyance culvert 40, manhole 50, cover plate 51, channel steel 52, DN50 automatic air vent valve 53, Z45T-10 gate valve 54. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] This application provides a pressure water tank that coordinates and improves the inlet and outlet flow patterns of a bidirectional pumping station, thus solving the problem that the pressure water tank cannot guarantee good flow patterns for both forward and reverse water intake.

[0049] The technical solution in this application is to solve the above-mentioned technical problems, and the general idea is as follows:

[0050] In this embodiment of the invention, the pressure tank can also serve as a reverse water diversion forebay. A porous, continuous frame structure is formed within the tank by combining short partitions and cylinders. The short partitions are connected to the ends of the flow channel partitions in the pump house, effectively dividing the water body while ensuring good flow patterns during both drainage and reverse water diversion, avoiding eddies and flow deviations. The cylinders are evenly spaced along the streamline direction of the short partitions in the transition section, minimizing the water-blocking area and maximizing water flow exchange within the tank while meeting structural strength requirements, thus ensuring reverse water diversion. The water in the inlet channels of each unit is evenly distributed to ensure the efficient and safe operation of the pumps. The center diffusion angle β of the tank is 25° to 30°, which ensures that the water flow does not detach from the tank sidewalls, the water flow is smooth and there is no backflow, and the project is economical. At the same time, it meets the requirement that the underwater volume of the forebay used for reverse water intake should not be less than 80 times the design flow rate. The longitudinal slope of the top and bottom plates of the tank is appropriately slowed down, and neither is steeper than 1:4, which ensures that the flow state in the pressure tank is good under the conditions of flood drainage and reverse water intake, and ensures that the unit can operate safely, efficiently and stably.

[0051] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0052] Example:

[0053] like Figure 1 , Figure 2 As shown, the present invention provides a pressure water tank for coordinating and improving the inlet and outlet flow patterns of a bidirectional pumping station. The pressure water tank includes: a tank body 10, short partitions 20, and a cylinder 21.

[0054] The box body 10 includes: a constant width section 11 and a gradient section 12; the constant width section 11 is connected to the pump house 30, and the gradient section 12 is connected to the water conveyance culvert 40.

[0055] The short partition 20 is sequentially installed at the end of the flow channel partition wall of the pump room 30, and the short partition 20 is rigidly fixed to the top and bottom plates of the equal width section 11.

[0056] The cylinders 21 are arranged at equal intervals along the streamline direction of the short partition 20, and the cylinders 21 are rigidly connected to the top and bottom plates of the transition section 12.

[0057] The center diffusion angle β of the box 10 is 25° to 30°;

[0058] The top plate of the box 10 is provided with a longitudinal slope, and the longitudinal slope ratio of the top plate to m1 is not steeper than 1:4;

[0059] The bottom plate of the box 10 is provided with a longitudinal slope, and the longitudinal slope ratio of the bottom plate to m2 is not steeper than 1:4.

[0060] The pressure tank can also serve as a reverse water intake forebay. By combining short partitions 20 and cylinders 21 within the tank body 10, with the short partitions 20 connected sequentially to the end of the flow channel partition wall in the pump house 30, the water body can be effectively divided. This ensures good flow during both drainage and reverse water intake, avoiding eddies and flow deviations. The cylinders 21 are evenly spaced along the streamline direction of the short partitions 20 in the transition section 12, minimizing the water-blocking area and maximizing water flow exchange within the tank while meeting structural strength requirements. This ensures that each pump can operate smoothly during reverse water intake. The balanced distribution of water in the unit's inlet channel ensures efficient and safe operation of the pumps. The center diffusion angle β of the tank 10 is 25° to 30°, ensuring that the water flow does not detach from the tank sidewalls, resulting in smooth water flow without backflow and economical engineering. At the same time, it meets the requirement that the underwater volume of the forebay used for reverse water intake should not be less than 80 times the design flow rate. The longitudinal slope of the top and bottom plates of the tank 10 is appropriately reduced, with neither slope exceeding 1:4, ensuring good flow in the pressure tank under both flood drainage and reverse water intake conditions, thus ensuring the safe, efficient, and stable operation of the unit.

[0061] The lengths D and L of the equal-width section 11 and the gradually changing section 12 in the direction of water flow are determined based on the central diffusion angle β and the requirement that the underwater volume of the forebay, which also serves as a reverse water intake pool, should not be less than 80 times the design water intake flow rate under the minimum water intake condition. The specific formula is as follows:

[0062]

[0063]

[0064] V≥80Q;

[0065] Where Q is the design flow rate for reverse water diversion, in m³ / s. 3 / s;

[0066] V represents the underwater volume of the pressure tank under the lowest reverse priming condition, in cubic meters (m³). 3 ;

[0067] β is the center contraction angle of the pressure tank, which is 25° to 30°;

[0068] B1 is the starting width of the transition section, in meters (m).

[0069] B2 is the width at the end of the transition section, in meters (m).

[0070] L is the length of the transition segment, in meters (m).

[0071] D represents the length of the equal-width section, in meters, and must be no less than 4.0 meters.

[0072] h1 is the water depth under the diaphragm in the equal-width section, in meters;

[0073] h2 is the initial water depth of the transition section, in meters;

[0074] h3 is the water depth at the end of the transition section, in meters;

[0075] h4 represents the height difference between the culvert sill and the pressure water tank sill, in meters (m).

[0076] like Figure 2 As shown, a baffle 22 is sequentially installed at the end of the double-layer flow channel baffle of the pump room 30. The baffle 22 has the same length as the short baffle 20. It not only guides the flow and eliminates vortices, but also improves the structural stress of the box 10 and enhances the structural stability. The thickness of the baffle 22 is determined according to the structural strength calculation and is not less than 0.5 meters.

[0077] like Figure 1 As shown, the length of the tank 10 in the direction of water flow is determined according to the central diffusion angle β and the underwater volume requirement of the forebay that also serves as a reverse water intake pool. The length D of the equal width section 11 is 4.2 meters, and the length L of the transition section 12 is 18.5 meters. The central diffusion angle β of the tank 10 is 30°, and the longitudinal slope ratios m1 and m2 of the top plate are both 1:4, which ensures that the water flow does not detach from the sidewalls of the tank 10, and the water flow is smooth without backflow. Under the lowest reverse water intake condition, the underwater volume of the tank 10 is 105 times the design water intake flow rate, which meets the requirement that the underwater volume of the forebay that also serves as a reverse water intake pool should not be less than 80 times the design flow rate, thus ensuring the safe, efficient and stable operation of the unit.

[0078] like Figure 1 As shown, the length of the short partition 20 is the same as the length D of the equal width section 11. The thickness of the short partition 20 is 0.6 to 1.1 meters. The planar shape of the short partition 20 is set as a gradually streamlined shape with rounded corners at the ends.

[0079] like Figure 1 As shown, the diameter of the cylinder 21 is not less than 0.8 meters, and the center distance between adjacent cylinders 21 flowing upstream is 3 times the diameter of the cylinder 21.

[0080] like Figure 2As shown, a vent pipe 13 is installed in the top plate of the box body 10 near the pump house. The bottom end of the vent pipe 13 is connected to the interior of the box body 10, and the top end of the vent pipe 13 is connected to the external space of the box body 10. The top end of the vent pipe 13 is located in a remote place, separate from the pump station building, and the elevation of the top end of the vent pipe 13 is 2 meters higher than the flood control level on the outer river side. The vent pipe 13 is a stainless steel pipe with a diameter of not less than 0.15 meters. The number of vent pipes 13 is determined according to the required effective ventilation area to ensure sufficient safe and reliable ventilation area, ensure effective exchange between the airflow inside the box body 10 and the outside air, avoid water flow turbulence, and eliminate structural cavitation damage.

[0081] like Figure 2 As shown, the top of the box body 10 is provided with an access well 50. The top elevation of the access well 50 is 0.3 to 0.5 meters above the ground, and the planar dimensions are not less than 0.8 meters * 1.8 meters. The top of the access well 50 is provided with a cover plate 51, which is a Q235 steel plate with a thickness of not less than 14 mm.

[0082] The 50-meter manhole is used for hoisting equipment, pressure water tank maintenance, and dredging.

[0083] like Figure 3 As shown, channel steel 52 is fixed around the manhole 50. The channel steel 52 is fixed to the cover plate 51 by bolts and nuts. A rubber waterstop ring is set between the channel steel 52 and the cover plate 51 to ensure the flood protection safety of the box body 10. The channel steel 52 is 10 mm thick and the rubber waterstop ring is 10 mm thick. The cover plate 51 is equipped with a DN50 automatic air vent valve 53 and a Z45T-10 gate valve 54 to eliminate the damage of cavitation to the concrete structure, improve the water flow pattern, and improve the unit operating efficiency.

[0084] The box body 10, short partition 20, column 21 and partition 22 are all made of reinforced concrete with a concrete strength grade of not less than C25.

[0085] The pressure tank is designed to drain water with a flow rate of 35.3 m³ / h. 3 / s, designed reverse water diversion flow rate 15.0m³ / s. 3 The pumping station, with a capacity of 4 vertical axial flow pumps per second, employs an "X"-shaped bidirectional box-type flow channel. Drainage and water diversion functions are achieved through control of the inlet and outlet gates of the flow channel. The project mainly consists of an intake channel, a debris interception and maintenance gate, a drainage forebay, a pump house, a pressure tank, a water conveyance culvert, and a flood control gate. The pressure tank serves as the drainage collection tank for the unit and also functions as a reverse water diversion forebay. The project utilizes a multi-hole continuous frame structure formed by combining reinforced concrete short piers and columns within the pressure tank. The design rationally determines the central diffusion angle of the pressure tank and meets the underwater volume requirements of the forebay. The longitudinal slope of the top and bottom slabs is appropriately reduced, effectively resolving the problem of turbulent flow patterns when the pressure tank discharges water and also serves as the forebay in a bidirectional pumping station. After the pumping station was completed and put into operation, no abnormal vibrations were observed in the unit's operation, the pump performance was highly efficient, and no significant deformation or cracks were found in the pressure tank structure.

[0086] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0087] 1. In this embodiment of the invention, the pressure tank can also serve as a reverse water diversion forebay. A porous continuous frame structure is formed within the tank by combining short partitions and cylinders. The short partitions are connected to the ends of the flow channel partitions in the pump house, effectively dividing the water body and ensuring good flow during both drainage and reverse water diversion, avoiding eddies and flow deviations. The cylinders are arranged at equal intervals along the streamline direction of the short partitions in the transition section, minimizing the water-blocking area and maximizing water flow exchange within the tank while meeting structural strength requirements, thus ensuring the reverse water diversion... The water distribution in the inlet channels of each unit is balanced to ensure the efficient and safe operation of the pumps. The diffusion angle β at the center of the tank is 25° to 30°, which ensures that the water flow does not detach from the tank sidewalls, the water flow is smooth and there is no backflow, and the project is economical. At the same time, it meets the requirement that the underwater volume of the forebay used for reverse water intake should not be less than 80 times the design flow rate. The longitudinal slope of the top and bottom plates of the tank is appropriately slowed down, and neither is steeper than 1:4, which ensures that the flow state in the pressure tank is good under the conditions of flood drainage and reverse water intake, and ensures that the unit can operate safely, efficiently and stably.

[0088] 2. In this embodiment of the invention, the short piers and columns are rigidly fixed to the top and bottom plates of the box body, forming a reinforced concrete pier-type multi-hole continuous frame structure for the pressure water tank, which reduces the structural span, reduces the amount of engineering work, saves engineering investment, and is economical and safe.

[0089] 3. In this embodiment of the invention, a vent pipe is installed in the top plate near the pump room side of the tank to enable effective and smooth exchange between the airflow inside the pressure tank and the outside air, eliminate structural cavitation damage, and ensure the structural stability of the pressure tank and the safe operation of the pump station.

[0090] 4. In this embodiment of the invention, an access well is provided at the top of the box, which is beneficial for hoisting equipment, inspection, dredging and management and maintenance.

[0091] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0092] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pressure water tank for coordinating and improving the inlet and outlet flow patterns of a bidirectional pumping station, characterized in that, The pressure tank includes: a tank body (10), short partitions (20) and a cylinder (21); The box body (10) includes: a constant width section (11) and a gradual change section (12); the constant width section (11) is connected to the pump house (30), and the gradual change section (12) is connected to the water conveyance culvert (40); The short partition (20) is installed sequentially at the end of the flow channel partition wall of the pump room (30), and the short partition (20) is rigidly fixed to the top and bottom plates of the equal width section (11); The cylinders (21) are arranged at equal intervals along the streamline direction of the short partition (20), and the cylinders (21) are rigidly connected to the top and bottom plates of the transition section (12). The center diffusion angle β of the box (10) is 25°~30°; The top plate of the box (10) is provided with a longitudinal slope, and the longitudinal slope of the top plate is not steeper than 1:4 than m1; The bottom plate of the box (10) is provided with a longitudinal slope, and the longitudinal slope ratio of the bottom plate to m2 is not steeper than 1:4; The lengths D and L of the equal-width section (11) and the gradually changing section (12) in the direction of water flow are determined based on the central diffusion angle β and the requirement that the underwater volume of the forebay, which also serves as a reverse water intake pool, should not be less than 80 times the design water intake flow rate under the minimum water intake condition. The specific formula is as follows: Where Q is the design flow rate for reverse water diversion, in m³ / s. 3 / s V represents the underwater volume of the pressure tank under the lowest reverse priming condition, in cubic meters (m³). 3 ; β is the diffusion angle at the center of the pressure tank, which is 25°~30°; B1 is the starting width of the transition section, in meters (m). B2 is the width at the end of the transition section, in meters (m). L is the length of the transition segment, in meters (m). D represents the length of the equal-width section, in meters, and must be no less than 4.0 meters. h1 is the water depth under the diaphragm in the equal-width section, in meters; h2 is the initial water depth of the transition section, in meters; h3 is the water depth at the end of the transition section, in meters; h4 represents the height difference between the culvert sill and the pressure water tank sill, in meters (m).

2. The pressure water tank for coordinating and improving the inlet and outlet flow patterns of a bidirectional pumping station as described in claim 1, characterized in that, The pump room (30) has a partition (22) connected to the end of the double-layer flow channel partition. The partition (22) is the same length as the short partition (20). The thickness of the partition (22) is determined according to the structural strength calculation and is not less than 0.5 meters.

3. The pressure tank for coordinating and improving the inlet and outlet flow patterns of a bidirectional pumping station as described in claim 1, characterized in that, The length of the short partition (20) is the same as the length D of the equal width section (11). The thickness of the short partition (20) is 0.6~1.1 meters. The planar shape of the short partition (20) is set as a gradually streamlined shape with rounded corners at the ends.

4. The pressure tank for coordinating and improving the inlet and outlet flow patterns of a bidirectional pumping station as described in claim 1, characterized in that, The diameter of the cylinder (21) is not less than 0.8 meters, and the center distance between adjacent cylinders (21) flowing upstream is 3 times the diameter of the cylinder (21).

5. The pressure water tank for coordinating and improving the inlet and outlet flow patterns of a bidirectional pumping station as described in claim 1, characterized in that, A vent pipe (13) is installed in the top plate of the box (10) near the pump house. The bottom end of the vent pipe (13) is connected to the inside of the box (10), and the top end of the vent pipe (13) is connected to the outside space of the box (10). The top end of the vent pipe (13) is located in a remote place, separate from the pump station building, and the elevation of the top end of the vent pipe (13) is 2 meters higher than the flood control level on the outer river side. The vent pipe (13) is a stainless steel pipe with a diameter of not less than 0.15 meters. The number of vent pipes (13) is determined according to the required effective ventilation area.

6. The pressure tank for coordinating and improving the inlet and outlet flow patterns of a bidirectional pumping station as described in any one of claims 1 to 5, characterized in that, The top of the box (10) is provided with an entrance well (50), the top elevation of the entrance well (50) is 0.3~0.5 meters higher than the ground, and the planar dimensions are not less than 0.8 meters * 1.8 meters; the top of the entrance well (50) is provided with a cover plate (51).

7. The pressure tank for coordinating and improving the inlet and outlet flow patterns of a bidirectional pumping station as described in claim 6, characterized in that, The manhole (50) is fixed with channel steel (52) around its perimeter. The channel steel (52) is fixed to the cover plate (51) by bolts and nuts. A rubber waterstop ring is provided between the channel steel (52) and the cover plate (51).

8. The pressure tank for coordinating and improving the inlet and outlet flow patterns of a bidirectional pumping station as described in claim 6, characterized in that, The cover plate (51) is equipped with a DN50 automatic exhaust valve (53) and a Z45T-10 gate valve (54).

9. The pressure tank for coordinating and improving the inlet and outlet flow patterns of a bidirectional pumping station as described in claim 2, characterized in that, The box body (10), short pier (20), column (21) and partition (22) are all made of reinforced concrete with a concrete strength grade of not less than C25.

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