A device for slightly increasing the water head and accelerating the flow velocity of the runoff section of a water conveyance main canal

Abstract

The present invention discloses a device for increasing the flow velocity by slightly raising the water head at the runoff section of a water conveyance main canal, which relates to the field of water conservancy and water service. It includes a water conveyance main canal, a full-section flow channel pump group, an artificial water cushion pond, a pump group power control cabinet, and a water cushion pond height regulator; there is a screw axial flow pump group in the full-section flow channel pump group; the pump group power control cabinet is connected to the screw axial flow pump group, and the water cushion pond height regulator is connected to the water cushion pond height regulator. The present invention sets up a flow control and lifting system at different positions of the main canal that can increase the flow velocity and raise the water head in local sections, so that the water conveyance main canal no longer flows passively by gravity, but becomes a water power flow that can be controlled and adjusted within the whole range, enabling the dynamic allocation and maximum utilization of water resources, and having remarkable social and economic benefits.

Description

Technical Field

[0001] The present invention relates to the field of water conservancy and water services, and more specifically, it is a device for slightly increasing the water head and accelerating the flow velocity of the runoff section of a water conveyance main canal. Background Art

[0002] Water conveyance main canals, especially artificial water conveyance main canals, generally adopt the gravity flow method. Therefore, under the gravity flow method, the water flow velocity in the canal is relatively slow. The too slow flow velocity not only limits the water conveyance volume, but also easily causes the water quality to be polluted by non-point sources and atmospheric deposition, resulting in poor water quality. These phenomena have become common problems in water conveyance main canals using the gravity flow method.

[0003] Therefore, it is necessary to develop a device for slightly increasing the water head and accelerating the flow velocity of the runoff section of a water conveyance main canal. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the above background art, and provide a device for slightly increasing the water head and accelerating the flow velocity of the runoff section of a water conveyance main canal.

[0005] To achieve the above purpose, the technical solution of the present invention is: a device for slightly increasing the water head and accelerating the flow velocity of the runoff section of a water conveyance main canal, including a water conveyance main canal, a full-section flow channel pump group, an artificial water cushion pond, a pump group power control cabinet, and a water cushion pond height regulator;

[0006] The full-section flow channel pump group is located in the water conveyance main canal, and there is a screw axial flow pump group in the full-section flow channel pump group;

[0007] The artificial water cushion pond is located at the bottom of the water conveyance main canal flow channel;

[0008] The pump group power control cabinet and the water cushion pond height regulator are located on the access road of the water conveyance main canal. The pump group power control cabinet is connected to the screw axial flow pump group through a pump group power cable, and the water cushion pond height regulator is connected to the water cushion pond height regulator through a water cushion pond hydraulic power cable.

[0009] In the above technical solution, it further includes a gate slot; the gate slot is connected to the top of the full-section flow channel pump group, and there is a gantry above the gate slot.

[0010] In the above technical solution, the gate slot is connected to the top of the full-section pump group through a plurality of pump group lifting mechanisms.

[0011] In the above technical solution, the pump group power control cabinet is provided with a screw axial flow pump group axis angle control and adjustment device, and the screw axial flow pump group axis angle control and adjustment device is used to adjust and control the axis angle of the screw axial flow pump group, and the angle adjustment range is 0-30°.

[0012] In the above technical solution, there is a mechanical linkage structure for adjusting the inclination angle of the pump group on the pump group lifting mechanism, so that the inclination angle of the pump group lifting mechanism is consistent with the inclination angle of the screw axial flow pump group.

[0013] In the above technical solution, the overall structure of the full cross-section pump group of the flow channel is mesh-shaped.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1) The present invention provides a flow control and lifting system that can increase the flow velocity and improve the water head of local sections at different positions in the main canal, so that the main water conveyance canal no longer flows passively by gravity, but becomes a water power flow that can be controlled and adjusted throughout the range, enabling the dynamic allocation and maximum utilization of water resources, and having significant social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the present invention.

[0017] Figure 2 It is a schematic principle diagram of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] The implementation of the present invention will be described in detail below with reference to the drawings, but they do not constitute a limitation to the present invention, and are only for illustration purposes. At the same time, the advantages of the present invention will become clearer and easier to understand through the description.

[0019] Referring to the drawings, it can be seen that a device for slightly lifting the water head and increasing the flow velocity of the runoff cross-section of a main water conveyance canal includes a main water conveyance canal 1, a full cross-section pump group 2 of the flow channel, an artificial water cushion pond 4, a pump group power control cabinet 5, and a water cushion pond height regulator 6;

[0020] The full cross-section pump group 2 of the flow channel is located in the main water conveyance canal 1, and there is a screw axial flow pump group 21 inside the full cross-section pump group 2 of the flow channel;

[0021] The artificial water cushion pond 4 is located at the bottom of the flow channel of the main water conveyance canal 1;

[0022] The pump group power control cabinet 5 and the water cushion pond height regulator 6 are located on the access road 11 of the main water conveyance canal 1. The pump group power control cabinet 5 is connected to the screw axial flow pump group 21 through a pump group power cable 51, and the water cushion pond height regulator 6 is connected to the water cushion pond height regulator 6 through a water cushion pond hydraulic power cable 61.

[0023] It further includes a gate slot 3; the gate slot 3 is connected to the top of the full cross-section pump group 2 of the flow channel, and there is a gantry above the gate slot 3. By lifting the full cross-section pump group 2 of the flow channel with the gantry, stepless adjustment within the range of the flow velocity from 0 (fully closed) to 150%-200% (the original flow velocity of the cross-section) can be achieved.

[0024] The gate slot 3 is connected to the top of the full-section pump unit 2 through multiple pump unit lifting mechanisms 7.

[0025] On the pump unit power control cabinet 5, there is an axial line angle control and adjustment device 52 for the screw axial flow pump unit. The axial line angle control and adjustment device 52 is used to adjust and control the axial line angle of the screw axial flow pump unit, and the angle adjustment range is 0 - 30°.

[0026] On the pump unit lifting mechanism 7, there is a mechanical linkage structure 71 for adjusting the inclination angle of the pump unit, so that the inclination angle of the pump unit lifting mechanism 7 is consistent with the inclination angle of the screw axial flow pump unit 21.

[0027] The overall structure of the full-section flow channel pump unit 2 is mesh-shaped.

[0028] In actual use, the water conveyance main canal 1 is an open water conveyance open channel. The channel is generally an artificial concrete-lined flow channel without covering on the top. On both sides of the lined channel, there are access roads 11 for operation inspection and transportation and maintenance equipment. The access roads 11 are made of concrete or asphalt pavement. Generally, buffer protection forest belts are also provided on both sides of the access roads 11 for closed management and ensuring water quality safety.

[0029] The full-section flow channel pump unit 2 is made of precast concrete or steel structure. The overall structure is mesh-shaped and can be equipped with a screw axial flow pump unit 21. The upper part of the full-section flow channel pump unit 2 is a platform structure, which can be used as a maintenance access channel or as a support platform for solar photovoltaic panels, with multiple functions.

[0030] The screw axial flow pump unit 21 is arranged in the full-section flow channel pump unit 2 along the water flow direction, and is actively driven. The power and speed of the pump unit are adjustable and controllable.

[0031] The artificial water cushion pond 4 is the bottom foundation of the unequal-height channel for head lifting. It can be a fixed structure with an overall steel plate arc surface, or a structure with combined guide vanes and hydraulically adjustable front and rear height differences. The artificial water cushion pond 4 is located at the bottom of the water conveyance main canal 1 flow channel, forming a height difference change at the bottom of the water conveyance main canal 1.

[0032] The pump unit power control cabinet 5 is used to control the power of the screw axial flow pump unit 21.

[0033] The pump unit power cable 51 is used to provide power to the screw axial flow pump unit 21, and can be an underwater cable or other water-resistant and waterproof cables.

[0034] The axial line angle control and adjustment device 52 for the screw axial flow pump unit is used to adjust and control the axial line angle of the screw axial flow pump unit 21, and generally the angle adjustment range is 0 - 30°.

[0035] The water cushion pond height regulator 6 is used to control and adjust the height of the artificial water cushion pond 4, and can adopt a hydraulic method (this device is not available for fixed water cushion ponds).

[0036] The pump group inclination angle adjustment mechanical linkage structure 71 is used to maintain the consistency of the inclination angle of the screw axial flow pump group 21 to reduce water resistance.

[0037] The hydraulic power cable 61 of the plunge pool is used to supply power to the hydraulic system of the artificial plunge pool 4, and it can be an underwater cable or other water-resistant and waterproof cables.

[0038] The gate slots 3 are arranged on both sides of the full-section pump group 2 in the flow channel. The full-section pump group 2 as a whole can move, be lifted out, and be lifted into along the gate slots 3.

[0039] The pump group lifting mechanism 7 is arranged above the full-section pump group 2 in the flow channel. The whole or local units can be lifted by using the pump group lifting mechanism 7, so that the flow velocity can be adjusted within the range of 0 - 200%.

[0040] In the present invention, the full-section pump group 2, the gate slots 3 and the pump group lifting mechanism 7 are arranged in the flow channel section of the water conveyance main canal 1. A plurality of tubular screw axial flow pumps are arranged in the full-section pump group 2, and the inclination angle of the screw axial flow pump can be adjusted. The bottom elevations of the gate slots 3 and the pump group lifting mechanism 7 along the water flow direction are arranged at the same or similar inclination angles as those of the screw axial flow pump to form a bottom elevation difference (about 0.5m - 1.0m) at the inlet and outlet.

[0041] By using an external power source and through the full-section and densely arranged screw axial flow pumps, the water heads (mainly for lifting) and flow velocities (mainly for accelerating) on both sides can be made different, so that the flow velocity of the flow channel section can be adjusted and the water conveyance volume of the flow channel can be adjusted. In addition, the rotational speed of the screw axial flow pump is adjustable, the number of working groups and the number of pumps are adjustable, the elevation difference with the artificial plunge pool 4 is adjustable, and the elevation difference between the screw axial flow pump and the artificial plunge pool 4 can be adjusted in a coordinated manner. The coordinated manner can be mechanical linkage or electrical linkage.

[0042] Other parts not described belong to the prior art.

Claims

1. A device for slightly increasing the water head and accelerating the flow velocity of the runoff section of a water conveyance main canal, characterized in that: It includes a water conveyance main canal (1), a full cross-section pump group of the flow channel (2), an artificial water cushion pool (4), a pump group power control cabinet (5), and a water cushion pool height regulator (6); The full cross-section pump group of the flow channel (2) is located in the water conveyance main canal (1), and there is a screw axial flow pump group (21) inside the full cross-section pump group of the flow channel (2); The artificial water cushion pool (4) is located at the bottom of the flow channel of the water conveyance main canal (1); The pump group power control cabinet (5) and the water cushion pool height regulator (6) are located on the access road (11) of the water conveyance main canal (1). The pump group power control cabinet (5) is connected to the screw axial flow pump group (21) through a pump group power cable (51), and the water cushion pool height regulator (6) is connected to the artificial water cushion pool (4) through a water cushion pool hydraulic power cable (61); It further includes a gate slot (3); the gate slot (3) is connected to the top of the full cross-section pump group of the flow channel (2), and there is a gantry above the gate slot (3); The gate slot (3) is connected to the top of the full cross-section pump group (2) through a plurality of pump group lifting mechanisms (7); There is a screw axial flow pump group axis angle control and adjustment device (52) on the pump group power control cabinet (5). The screw axial flow pump group axis angle control and adjustment device (52) is used to adjust and control the axis angle of the screw axial flow pump group, and the angle adjustment range is 0 - 30°; Among them, the artificial water cushion pool (4) is the foundation of the bottom of the unequal-height channel and is used for head lift.

2. The device for increasing the flow velocity by slightly raising the water head at the runoff section of the main water conveyance canal according to claim 1, wherein: There is a pump group inclination angle adjustment mechanical linkage structure (71) on the pump group lifting mechanism (7), so that the inclination angle of the pump group lifting mechanism (7) is consistent with the inclination angle of the screw axial flow pump group (21).

3. The device for increasing the flow velocity by slightly raising the water head at the runoff section of the main water conveyance canal according to claim 2, wherein: The overall structure of the full cross-section pump group of the flow channel (2) is mesh-shaped.

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