Automatic extension type vortex breaker when pump generates electricity in reverse and method

Abstract

The application relates to an automatic extension type vortex eliminator and method when a pump reversely generates electricity, which comprises a water guide cone, a cavity body arranged in the water guide cone, a vortex rod through hole arranged at the front end of the water guide cone, a water inlet and outlet arranged at the rear end of the water guide cone, and the vortex rod through hole and the water inlet and outlet being communicated with the cavity body; a first plastic filling block fixed in the cavity body is arranged in the cavity body of the water guide cone; a through hole is arranged on the first plastic filling block and corresponds to the vortex rod through hole; a spring and a vortex rod are further arranged, and the vortex rod is formed by a rod body and a rod cap; the outer diameter of the rod body is smaller than the inner diameter of the vortex rod through hole, and the outer diameter of the rod cap is larger than the inner diameter of the vortex rod through hole; the rod body and the rod cap of the vortex rod are arranged in the through hole of the first plastic filling block, the rod body is inserted into the vortex rod through hole and can move up and down along the vortex rod through hole, one end of the spring is fixed to the inner wall of the top of the cavity body in the water guide cone, and the other end of the spring is fixed to the rod cap of the vortex rod. Through the application, the vortex band at the front end of the water guide cone in the reverse power generation condition can be inhibited.

Description

Technical Field

[0001] This invention relates to an automatic extension type vortex suppression device and method when a pump generates electricity in reverse, belonging to the technical fields of water conservancy engineering and municipal engineering. Background Technology

[0002] Pumps, as a common type of water conveying machinery, are traditionally used mainly for agricultural irrigation and water resource allocation. However, due to practical engineering needs, many pumping stations require the discharge of excess water from upstream to downstream. In such cases, pumps can be used for reverse power generation. This involves the water flow driving the impeller to rotate, which in turn uses the torque of the shaft to drive a generator to produce electricity. This method can effectively conserve and utilize water resources and generate certain economic benefits.

[0003] When the pump is used for reverse power generation, although it has the function of generating electricity, the pump device is mainly designed for forward operation. When generating electricity in reverse, the pump device may have hydraulic instability. A common and unavoidable phenomenon in actual engineering and model tests is the vortex band at the impeller inlet throat. This phenomenon will affect the pressure pulsation pattern at this location, which will have a certain impact on the vibration and noise of the unit and threaten the safe operation of the unit.

[0004] Currently, most patents related to vortex suppression measures in the draft tube mostly involve adding fixed vortex suppression structures, such as guide plates or vortex suppression blades installed on the spillway cone. Utility model patent 202121586302.3 proposes a vortex suppression device for a mixed-flow turbine, which can effectively prevent the generation of vortices in the draft tube and reduce the energy within them. Invention patent CN201410034139.8 proposes a vortex suppression device within the turbine runner body, which can effectively eliminate draft tube vortices, reduce pressure pulsation, shorten the turbine's service life, and improve turbine efficiency. Current patents on vortex suppression measures are only designed for single operating conditions and do not address vortex suppression measures that accommodate both reverse pumping and forward operation.

[0005] Therefore, in order to improve the hydraulic performance of the pump in reverse power generation mode and ensure its safe operation without affecting its forward operation, this invention proposes an automatic extended vortex suppression device and method for pump reverse power generation. This design method can effectively alleviate the generation of vortex bands under reverse power generation mode without affecting the hydraulic performance during forward operation. Summary of the Invention

[0006] The purpose of this invention is to solve the technical problems in the background art by proposing an automatic extension type vortex suppression device and method when the pump generates electricity in reverse. This device and method can effectively suppress the generation of vortex bands at the front end of the guide cone during reverse power generation, while not affecting the hydraulic performance during forward operation.

[0007] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: an automatic extension anti-vortex device when a pump generates electricity in reverse, comprising a water guide cone, characterized in that the water guide cone is provided with a cavity, the front end of the water guide cone has an anti-vortex rod perforation, and the rear end has an inlet and outlet, the anti-vortex rod perforation and the inlet and outlet are both connected to the cavity. The cavity of the water guide cone contains a first plastic filling block fixed inside the cavity; the first plastic filling block has a through hole, which corresponds to the through hole of the anti-vortex rod. It also includes a spring and a vortex-eliminating rod. The vortex-eliminating rod is formed by fixing a rod body and a rod cap. The outer diameter of the rod body is smaller than the inner diameter of the vortex-eliminating rod through hole, and the outer diameter of the rod cap is larger than the inner diameter of the vortex-eliminating rod through hole. The rod body and rod cap of the vortex-eliminating rod are placed in the through hole of the first plastic filling block, and the rod body is inserted into the vortex-eliminating rod through hole and can move up and down along the vortex-eliminating rod through hole. The rod cap is always located in the through hole of the first plastic filling block. One end of the spring is fixed to the top inner wall of the cavity inside the water guide cone, and the other end is fixed to the cap of the vortex suppressor.

[0008] The inner wall of the hollow cavity of the water guide cone is provided with several protrusions, which extend into the first plastic filler block and serve to fix the position of the first plastic filler block.

[0009] During installation, the pump includes guide vanes and an impeller. The rear end of the guide cone is fixed to the impeller, and the guide cone rotates with the rotation of the impeller. The guide vane is located at one end of the guide cone opposite to the impeller, and the guide vane is not connected to the impeller.

[0010] The number of inlets and outlets is four, and the four inlets and outlets are evenly arranged around the water guide cone near the impeller.

[0011] A second plastic filler block is provided between the first plastic filler block and the cavity wall of the water guide cone to fix the first plastic filler block.

[0012] When the spring is reset, the end of the rod on the anti-vortex rod is flush with the front end of the water guide cone, and the end of the rod is located inside the through hole of the anti-vortex rod.

[0013] A method for eliminating vortices using an automatically extending vortex-eliminating device when a pump generates electricity in reverse includes the following steps: Step S1: When the pump is running in the forward direction, the impeller rotates, and water is drawn in sequentially through the guide cone, impeller, and guide vanes. When the anti-vortex rod extends out of the anti-vortex rod perforation, the anti-vortex rod is subjected to the upward impact force of the water flow. At the same time, under the pulling force of the spring return on the anti-vortex rod, the anti-vortex rod will move along the anti-vortex rod perforation into the through hole of the first plastic filling block in the guide cone until the anti-vortex rod retracts into the guide cone, and the end of the lowest point of the anti-vortex rod is flush with the front end of the guide cone. Step S2: When the pump runs in reverse, the impeller rotates in the opposite direction, and the water flows out through the guide vanes, impeller, and guide cone. A portion of the water flows into the interior of the guide cone from the inlet and outlet, and continuously exerts a huge impact force on the anti-vortex bar, causing the anti-vortex bar to move downward to the front end of the guide cone. At this time, the bar on the anti-vortex bar extends out from the anti-vortex bar perforation on the guide cone, and the extended bar inhibits the generation of vortex bands at the front end of the guide cone.

[0014] In step S1, the water flows upward and impacts the vortex suppressor. When some water flows into the guide cone through the perforation of the vortex suppressor, the water flowing into the guide cone is discharged from the guide cone through the inlet and outlet.

[0015] In step S2, when the water flows into the guide cone from the inlet and outlet, the water flowing into the guide cone is discharged from the guide cone through the perforation of the anti-vortex rod.

[0016] This invention features a reasonable structure and is easy to use. Addressing the hydraulic instability, unit vibration, and noise caused by vortices at the front end of the guide cone during reverse power generation, this invention adds an automatically extending anti-vortex bar inside the guide cone. When the pump is running in the forward direction, the anti-vortex bar is inside the guide cone, and the outer surface of the guide cone remains unchanged. When the pump is running in reverse, the anti-vortex bar is pushed out from the front end of the guide cone by the impact force of the water flow, thereby interfering with the generation of vortices there and improving the hydraulic performance under reverse power generation conditions.

[0017] In this invention, the water guide cone is composed of three main parts: a spring, a vortex-eliminating rod, and plastic filler blocks (including a first plastic filler block and a second plastic filler block). The vortex-eliminating rod is connected by a spring, and the vortex-eliminating rod coincides with the central axis. The plastic filler blocks are placed around the vortex-eliminating rod to fix its position and restrict its movement on the central axis.

[0018] A hole is made at the front end of the guide cone (the anti-vortex rod is perforated). When running in the forward direction, the end of the anti-vortex rod acts as the front end of the guide cone. When generating electricity in the reverse direction, the anti-vortex rod extends out from this hole. Four water inlets (i.e., inlet and outlet) are evenly made around the guide cone near the impeller, leading to the connection between the anti-vortex rod and the spring. The channel is smooth and straight. When generating electricity in the reverse direction, the water flow impacts the anti-vortex rod along this channel.

[0019] This invention primarily involves installing a vortex-suppressing rod inside the guide cone. During reverse power generation, water flows through openings (inlet and outlet) around the guide cone and impacts the vortex-suppressing rod, which extends from the front end of the guide cone. This suppresses the evolution of vortex bands at the front of the guide cone. During forward operation, the vortex-suppressing rod is fixed inside the guide cone by the tension of a spring and the impact force of the water flow, ensuring it does not affect the forward operation of the pump. This device and method can suppress the generation of vortex bands at the front of the guide cone during reverse power generation, avoiding abnormal pressure pulsations and hydraulic instability caused by vortex bands, and even preventing unit vibration and noise. Simultaneously, it does not affect the hydraulic performance of the pump during forward operation.

[0020] With the construction and implementation of low-lift pumping stations, many pumping stations have added reverse power generation mode. Inevitably, vortex bands will exist at the front end of the guide cone. Therefore, this invention can be applied and implemented, and can achieve significant economic and social benefits. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the water guide cone device for the pump during forward operation of the present invention; Figure 2 This is a schematic diagram of the water guide cone device for the reverse power generation operation of the pump in this invention; In the diagram: 1 guide vane, 2 impeller, 3 guide cone, 4 spring, 5 anti-vortex rod, 5-1 rod body, 5-2 rod cap, 6 first plastic filler block, 7 second plastic filler block, 8 inlet and outlet, 9 protruding point, 10 anti-vortex rod perforation. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and description.

[0023] An automatic extension anti-vortex device for pump reverse power generation includes a water guide cone 3, a cavity is provided inside the water guide cone 3, the front end of the water guide cone 3 has an anti-vortex rod through hole 10, and the rear end has an inlet and outlet 8, both of which are in communication with the cavity; a first plastic filling block 6 is placed and fixed inside the cavity of the water guide cone 3; the first plastic filling block 6 has a through hole, which corresponds to the anti-vortex rod through hole 10.

[0024] It is also set in spring 4 and vortex suppressor 5. Vortex suppressor 5 is formed by fixing rod body 5-1 and rod cap 5-2. The outer diameter of rod body 5-1 is smaller than the inner diameter of vortex suppressor through hole 10, and the outer diameter of rod cap 5-2 is larger than the inner diameter of vortex suppressor through hole 10. The rod body 5-1 and rod cap 5-2 of vortex suppressor 5 are placed in the through hole of first plastic filler block 6, and the rod body 5-1 is inserted into vortex suppressor through hole 10 and can move up and down along vortex suppressor through hole 10. The rod cap 5-2 is always located in the through hole of first plastic filler block 6. One end of spring 4 is fixed to the top inner wall of the cavity of water guide cone 3, and the other end is fixed to rod cap 5-2 of vortex suppressor 5.

[0025] Furthermore, several protrusions 9 are provided on the inner wall of the cavity of the water guide cone 3. The protrusions 9 extend into the first plastic filler block 6 and serve to fix the position of the first plastic filler block 6.

[0026] During installation, the pump includes guide vane 1, impeller 2, and guide cone 3. The rear end of the guide cone 3 is fixed to the impeller 2, and the guide cone 3 rotates with the impeller 2. The guide vane 1 is located at one end of the impeller 2 away from the guide cone 3, and the guide vane 1 is not connected to the impeller 2.

[0027] In this embodiment, there are four inlet and outlet ports 8, which are evenly arranged around the water guide cone 3 near the impeller 2.

[0028] A second plastic filler block 7 is provided between the first plastic filler block 6 and the cavity wall of the water guide cone 3 to fix the first plastic filler block 6.

[0029] When the spring 4 is in its reset state, the end of the rod 5-1 on the anti-vortex rod 5 is flush with the front end of the water guide cone 3, and the end of the rod 5-1 is located inside the anti-vortex rod through hole 10.

[0030] A method for eliminating vortices using an automatically extending vortex-eliminating device when a pump generates electricity in reverse includes the following steps: Step S1: When the pump is running in the forward direction, the impeller 2 rotates, and water is drawn in sequentially through the guide cone 3, impeller 2, and guide vane 1. When the anti-vortex rod 5 extends out of the anti-vortex rod perforation 10, the anti-vortex rod 5 is subjected to the upward impact force of the water flow. At the same time, under the tension of the spring 4 on the anti-vortex rod 5, the anti-vortex rod 5 will move along the anti-vortex rod perforation 10 into the through hole of the first plastic filling block 6 in the guide cone 3 until the anti-vortex rod 5 retracts into the guide cone 3, and the lowest point of the anti-vortex rod 5 is flush with the front end of the guide cone 3. The water flow impacts the anti-vortex rod 5 upward. When some water flows into the guide cone 3 through the anti-vortex rod perforation 10, the water flowing into the guide cone 3 is discharged from the guide cone 3 through the inlet and outlet 8.

[0031] In step S2, when the pump runs in reverse, the impeller 2 rotates in the opposite direction, and the water flows out through the guide vane 1, impeller 2, and guide cone 3. A portion of the water flows into the guide cone 3 from the inlet / outlet 8 and continuously exerts a huge impact force on the anti-vortex rod 5, causing the anti-vortex rod 5 to move downward to the front end of the guide cone 3. At this time, the rod body 5-1 on the anti-vortex rod 5 extends out from the anti-vortex rod perforation 10 on the guide cone 3, and the extended rod body 5-1 inhibits the generation of vortex bands at the front end of the guide cone 3. When the water flows into the guide cone 3 from the inlet / outlet 8, the water flowing into the guide cone 3 is discharged from the guide cone 3 through the anti-vortex rod perforation 10.

Claims

1. An automatic vortex suppressor device that extends when a pump generates electricity in reverse, comprising a guide cone (3), characterized in that, The water guide cone (3) has a cavity inside. The front end of the water guide cone (3) has a vortex-suppressing rod perforation (10), and the rear end has an inlet and outlet (8). The vortex-suppressing rod perforation (10) and the inlet and outlet (8) are both connected to the cavity. The cavity of the water guide cone (3) contains a first plastic filling block (6) fixed inside the cavity; the first plastic filling block (6) has a through hole, which corresponds to the through hole (10) of the vortex suppressor. It is also provided with a spring (4) and a vortex-eliminating rod (5). The vortex-eliminating rod (5) is formed by fixing a rod body (5-1) and a rod cap (5-2). The outer diameter of the rod body (5-1) is smaller than the inner diameter of the vortex-eliminating rod through hole (10), and the outer diameter of the rod cap (5-2) is larger than the inner diameter of the vortex-eliminating rod through hole (10). The rod body (5-1) and the rod cap (5-2) of the vortex-eliminating rod (5) are placed in the through hole of the first plastic filling block (6), and the rod body (5-1) is inserted into the vortex-eliminating rod through hole (10) and can move up and down along the vortex-eliminating rod through hole (10). The rod cap (5-2) is always located in the through hole of the first plastic filling block (6). One end of the spring (4) is fixed to the top inner wall of the cavity of the water guide cone (3), and the other end is fixed to the rod cap (5-2) of the vortex suppressor (5); The inner wall of the hollow cavity of the water guide cone (3) is provided with several protrusions (9), which extend into the first plastic filler block (6) and serve to fix the position of the first plastic filler block (6). And / or a second plastic filler block (7) is provided between the first plastic filler block (6) and the cavity wall of the inner cavity of the water guide cone (3) for fixing the first plastic filler block (6); During installation, the pump includes guide vanes (1) and impeller (2). The rear end of the guide cone (3) is fixed to the impeller (2), and the guide cone (3) rotates with the impeller (2). The guide vane (1) is located at one end of the impeller (2) away from the guide cone (3), and the guide vane (1) is not connected to the impeller (2); The number of inlet and outlet ports (8) is 4, and the 4 inlet and outlet ports (8) are evenly arranged around the water guide cone (3) near the impeller (2).

2. The automatic extension type vortex suppressor device for reverse power generation of a pump according to claim 1, characterized in that, When the spring (4) is reset, the end of the rod (5-1) on the anti-vortex rod (5) is flush with the front end of the water guide cone (3), and the end of the rod (5-1) is located inside the anti-vortex rod through hole (10).

3. A method for eliminating vortices using an automatic extension-type vortex suppressor device during reverse power generation as described in any one of claims 1-2, characterized in that, Includes the following steps: Step S1: When the pump is running in the forward direction, the impeller (2) rotates and water is drawn in sequentially through the guide cone (3), impeller (2), and guide vane (1). When the anti-vortex rod (5) extends out of the anti-vortex rod through hole (10), the anti-vortex rod (5) is subjected to the upward impact force of the water flow. At the same time, under the pulling force of the spring (4) on the anti-vortex rod (5) after the spring (4) is reset, the anti-vortex rod (5) will move along the anti-vortex rod through hole (10) into the through hole of the first plastic filling block (6) in the guide cone (3) until the anti-vortex rod (5) retracts into the guide cone (3) and the end of the lowest point of the anti-vortex rod (5) is flush with the front end of the guide cone (3). In step S2, when the pump is running in reverse, the impeller (2) rotates in reverse, and the water flows out through the guide vane (1), impeller (2), and guide cone (3); a portion of the water flows into the interior of the guide cone (3) from the inlet and outlet (8) and continuously exerts a huge impact force on the anti-vortex rod (5), causing the anti-vortex rod (5) to move downward to the front end of the guide cone (3). At this time, the rod (5-1) on the anti-vortex rod (5) extends out from the anti-vortex rod perforation (10) on the guide cone (3), and the extended rod (5-1) inhibits the generation of vortex bands at the front end of the guide cone (3). In step S1, the water flows upward and impacts the vortex suppressor (5). When some water flows into the guide cone (3) through the perforation (10) of the vortex suppressor, the water flowing into the guide cone (3) is discharged from the guide cone (3) through the inlet and outlet (8). In step S2, when the water flows into the guide cone (3) from the inlet / outlet (8), the water flowing into the guide cone (3) is discharged from the guide cone (3) through the vortex suppressor rod perforation (10).

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