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Device for preventing water hammer damage after positive displacement diaphragm pump accident and control method

A control method and diaphragm pump technology, applied in pump control, components of pumping devices for elastic fluids, pumps, etc., can solve problems affecting production organization, increasing maintenance costs of main pumps, and large damage

Pending Publication Date: 2020-11-24
YUNNAN DAHONGSHAN PIPELINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The water hammer effect (pressure oscillation trend) produced by the slurry pipeline system when the pump is stopped in an accident will greatly damage the moving and transmission components of the positive displacement diaphragm pump (especially the crankshaft at the power end, bearings, gears of the reducer, etc.), causing bearing damage over time. Mechanical failures in components such as gears, gears and connections occur from time to time, which increases the maintenance cost of the main pump and affects the production organization

Method used

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  • Device for preventing water hammer damage after positive displacement diaphragm pump accident and control method
  • Device for preventing water hammer damage after positive displacement diaphragm pump accident and control method
  • Device for preventing water hammer damage after positive displacement diaphragm pump accident and control method

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Experimental program
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Effect test

Embodiment 1

[0023] Such as Figure 1-2 As shown, three diaphragm chambers are selected for the main pump in this embodiment, and the piston chamber with the highest pressure is released in time when the three piston rods of the main pump lose power, so that the corresponding outlet one-way valve is closed in time to ensure that the counterattack zone generated by the pipeline water hammer coming pressure imbalance;

[0024] In this embodiment, a manual discharge valve is provided on the propulsive liquid side of the diaphragm chamber, and a three-way is installed on the manual discharge valve to form a total discharge channel and two branch discharge channels of the diaphragm chamber. It is characterized in that a manual discharge valve is set on the one branch discharge channel , and a high-pressure solenoid valve is set on the other branch discharge channel;

[0025] In this embodiment, a diaphragm chamber manual total discharge valve and a pressure sensor are installed on the total di...

Embodiment 2

[0030] Such as Figure 1-2 As shown, when the diaphragm pump in this embodiment is in normal operation, A1, A2, and A3 are in the normally open state; B1, B2, and B3 are in the closed state; C1, C2, and C3 are in the power-off and closed state; P1, P2, and P3 are detected in real time The pressure of three diaphragm chambers; D is with UPS control system, the port is connected with the pressure sensor to control the device in real time;

[0031] In this embodiment, A1, A2, and A3 are the total discharge valves of the three diaphragm chambers, and a manual needle valve is selected. This valve is used as the main valve for maintenance and is always in a normally open state; when the back-end valve (B or C series valve) or When the pipeline fails and needs to be repaired and replaced, close the valve to temporarily cut off the oil circuit; after the inspection is completed, manually open the valve, and the staff will observe the smoothness of the oil circuit and the pressure valu...

Embodiment 3

[0035] Such as Figure 1-3 As shown, in this embodiment, the C series high-pressure solenoid valve is monitored in real time by the pressure sensor through the control system with UPS, and is normally closed;

[0036] In this embodiment, after the accident occurs, the UPS control system receives signals to judge the fault. (1) The system judges that the power supply system is faulty, and the main power loss signal is introduced into the UPS control system by the diaphragm pump inverter system; one end of the high-voltage solenoid valve is connected to The UPS connection port with UPS control system, even if the power fails, it can be powered by the UPS power supply alone, and the high-voltage solenoid valve will not be opened normally due to the power failure;

[0037] (2) The system judges that it is a mechanical failure of the pump or a failure of the control system. The emergency shutdown signal of the diaphragm pump is pre-judged by the on-site PLC system. If it is judged ...

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Abstract

The invention discloses a device for preventing water hammer damage after a positive displacement diaphragm pump accident and a control method, and relates to the field of ore pulp pipeline conveying.The device comprises a plurality of main pump diaphragm chambers, each diaphragm chamber is independently connected with a piston rod on a main pump, a main maintenance valve is arranged on a main discharge channel on the propelling liquid side of each diaphragm chamber, and the main discharge channels are downwards communicated with an oil tank; and pressure sensors are arranged on the main discharge channels, the pressure sensors are connected with high-pressure electromagnetic valves on the main discharge channels, and the other ends of the high-pressure electromagnetic valves are connected with UPS connecting ports with UPS control systems. The device has the advantages that the outlet pressure can be effectively released in time when a main pump crankshaft loses power, it is guaranteed that the pressure of the main pump diaphragm chambers is lower than the opening pressure of outlet one-way valves, it is guaranteed that the outlet one-way valves are closed in time, the pressure is further prevented from being conducted to a main pump bearing, and protection of the main pump is achieved.

Description

technical field [0001] The invention discloses an anti-hammer damage device and a control method after a positive displacement diaphragm pump accident, and relates to the technical field of pulp pipeline transportation. Background technique [0002] Positive displacement diaphragm pumps are widely used in the field of solid-liquid two-phase flow (slurry) pipeline transportation due to their high delivery head, no direct contact between the delivery medium and the active power parts of the pump body, and high efficiency. In actual production and operation, it is inevitable that there will be Many sudden accident shutdown conditions (such as power failure of pumping stations, mechanical and control failures, etc.). As we all know, in the process of fluid pipeline transportation, sudden shutdown will produce different degrees of pump stop water hammer (related to the conveying medium, pipeline characteristics, device performance, etc.), the stop pump water hammer is very harmfu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B43/067F04B43/073F04B53/10F04B49/06F04B49/08F04B49/22F04B11/00
CPCF04B11/00F04B43/0081F04B43/067F04B43/0733F04B43/0736F04B49/065F04B49/08F04B49/225F04B53/10
Inventor 韩军刚周传奇赵增佳李剑锋李申鹏田飞飞
Owner YUNNAN DAHONGSHAN PIPELINE
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