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Pump-stopping water hammer protection method and pump-stopping water hammer protection device for centrifugal pump

A pump stop water hammer and protection device technology, which is applied to the components of the pumping device for elastic fluid, pump elements, variable capacity pump components, etc., can solve the problem of increasing investment in water pump units or motors, prolonging the start-up time of motors, Improve the cost of the water transfer system and other issues to achieve the effect of increasing equipment investment, prolonging the time to start reverse, and reducing energy consumption for water transfer

Active Publication Date: 2014-03-12
SHANDONG SURVEY & DESIGN INST OF WATER CONSERVANCY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are obvious deficiencies in the existing protection schemes: 1) Increase the investment of the water pump unit or the motor; 2) After adding the inertial flywheel, the starting time of the motor will be prolonged, and in severe cases, it will cause difficulty in starting; 3) After adding the inertial flywheel, it will also increase the Water transfer energy consumption increases the cost of the water diversion system

Method used

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  • Pump-stopping water hammer protection method and pump-stopping water hammer protection device for centrifugal pump
  • Pump-stopping water hammer protection method and pump-stopping water hammer protection device for centrifugal pump
  • Pump-stopping water hammer protection method and pump-stopping water hammer protection device for centrifugal pump

Examples

Experimental program
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Effect test

Embodiment 1

[0023] A water hammer protection method for a centrifugal pump when the pump is stopped, which is to set the water pump main shaft and / or the motor main shaft of the water pump unit in the form of shaft output at both ends, and connect an electromagnetic clutch to the outer shaft end of the water pump main shaft and / or the motor main shaft, And the inertial flywheel is connected to the rear end of the electromagnetic clutch. When the water pump unit is working, the electromagnetic clutch is separated. When the water pump unit is powered off and the pump is stopped, the electromagnetic clutch absorbs and applies an inertial moment to the water pump unit and / or the motor through the inertial flywheel. To increase the moment of inertia to achieve water hammer protection.

[0024] The electromagnetic clutch is a normally closed electromagnetic clutch.

Embodiment 2

[0026] as attached image 3 As shown, a water hammer protection device for centrifugal pumps, including a water pump 4 and a motor 1 connected to the water pump 4, the water pump 4 is a horizontal centrifugal pump, which adopts a shaft structure at both ends, and the inner side of the water pump 3 The coupling 2 is connected with the motor 1, and the outer shaft 5 of the water pump is connected with an electromagnetic clutch 6, and the rear end of the electromagnetic clutch 6 is connected with an inertial flywheel 7. A protective cover 8 is provided outside the inertial flywheel 7 . Both the water pump 4 and the motor 1 are arranged on the frame 9 .

[0027] The electromagnetic clutch 6 is a normally-closed electromagnetic clutch, which pulls in when it is powered off, and separates when it is powered on. It can be controlled by the 24V or 90V DC power supply of the pumping station. The inertia flywheel 7 can adopt a spoke type or a disc type. In order to facilitate the con...

Embodiment 3

[0031] as attached Figure 4 As shown, a centrifugal pump water hammer protection device includes a water pump 4 and a motor 1 connected to the water pump 4 , and the water pump 4 and the motor 1 are both arranged on a frame 9 . The motor 1 adopts a shaft structure at both ends. The inner shaft 10 of the motor is connected to the water pump 4 through the coupling 2. The outer shaft 11 of the motor is connected to the electromagnetic clutch 6, and the rear end of the electromagnetic clutch 6 is connected to an inertial flywheel 7. A protective cover 8 is provided outside the inertial flywheel 7 .

[0032] Described electromagnetic clutch 6 is a normally closed type, flange type electromagnetic clutch, and the electromagnetic clutch pulls in when power off, and separates when power is turned on, and it can be controlled by the 24V or 90V DC power supply of the pumping station. The inertia flywheel 7 can adopt a spoke type or a disc type, which is connected with the electromagne...

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Abstract

The invention discloses a pump-stopping water hammer protection method and a pump-stopping water hammer protection device for a centrifugal pump. According to the pump-stopping water hammer protection method for the centrifugal pump, a water pump spindle of a water pump unit and/or a motor spindle are designed into a structure mode of two-end shaft extension, the outer-side shaft extension end of the water pump spindle and/or the motor spindle are connected with an electromagnetic clutch, and the rear end of the electromagnetic clutch is connected with an inertia fly wheel. When the water pump unit works, the electromagnetic clutch is separated. When the water pump unit is in power failure to stop a pump, the electromagnetic clutch is combined and applies inertia moment to the water pump unit and/or a motor to increase rotational inertia through the inertia fly wheel, and thus the water hammer protection is realized. When the centrifugal pump stops, the device can immediately apply the inertia moment to increase the rotational inertia, and therefore the time when the water pump unit starts to inversely rotate is prolonged, the speed of inverse rotation of the water pump is reduced within rated rotation speed, the water hammer pressure in a pipeline is reduced, and the purpose of pump-stopping water hammer protection is achieved. Moreover, the motor load is not increased, energy consumption is not increased, the engineering investment can be effectively reduced, and the water delivery cost is reduced.

Description

technical field [0001] The invention relates to a water hammer protection method for a centrifugal pump when the pump is stopped, in particular to a water hammer protection method for a long-distance high-lift water delivery pipeline in a hilly area when the pump is stopped. The invention also relates to a device for water hammer protection of water pumps in pumping stations of water pipelines in hilly areas. Background technique [0002] Water hammer accidents are a common phenomenon in long-distance high-lift pipeline water transmission projects in hilly areas, especially in projects with large pipeline height fluctuations and complex terrain. There are also various examples of accidents. In the pumping station system, the water pump suddenly stops due to power failure or other reasons. Water hammer accidents will cause disasters of varying degrees, ranging from rupture of water pipes (i.e. pipe bursts), resulting in interruption of water supply, affecting normal producti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B53/00
Inventor 杜培文祝凤山许志刚岳永起郭绍春张婷刘天政王金华
Owner SHANDONG SURVEY & DESIGN INST OF WATER CONSERVANCY
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