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No-setting pump no-liquid idling preventing protector

An anti-idling and protector technology, applied in pump control, mechanical equipment, machine/engine, etc., can solve the problems of reducing product specifications and varieties, false protection, no protection, etc.

Active Publication Date: 2011-07-06
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to address the above defects, to provide a non-setting pump type aneroid anti-idling protector, which can greatly reduce product specifications and varieties, each specification can be used arbitrarily within a wide range, and solve the problem of setting scales. Inaccurate protection or non-protection caused by accidental or other reasons

Method used

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  • No-setting pump no-liquid idling preventing protector
  • No-setting pump no-liquid idling preventing protector
  • No-setting pump no-liquid idling preventing protector

Examples

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Embodiment Construction

[0012] specific implementation plan

[0013]Three-phase non-setting pump aneroid anti-idling protector, the working current of the pump motor detected by the three-phase current transformer is respectively taken from the signal resistor to amplify and rectify the synthesized, through the pump aneroid anti-idling self-determined benchmark The memory module controls the pump motor through the control circuit to realize no-load protection. Specifically, one end of the current transformer L1, current transformer L2, and current transformer L3 is connected to the common terminal, and the other end of the current transformer L1 is connected to the signal resistor R01 and The positive input terminal of the operational amplifier U1A, the other end of the current transformer L2 is connected to the signal resistor R02 and the positive input terminal of the operational amplifier U1B, the other end of the current transformer L3 is connected to the signal resistor R03 and the positive input...

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Abstract

The invention relates to a no-setting pump no-liquid idling preventing protector. The protector is characterized in that a self-defining reference memory protection module begins to automatically memorize a certain numerical value of a working current as a reference serving as a no-load current set value when a pump motor is started up and runs normally; and when a phenomenon of no-liquid idling occurs and the working current is enabled to drop to a value lower than the automatically memorized no-load current set value, the protector can perform a protection function and automatically stop the motor, so that the specifications and the varieties of products can be reduced, the protector of each specification can be used freely within a large range, and the problems of false protection or no protection caused by inaccurate calibration setting or other reasons can be solved.

Description

technical field [0001] The invention relates to a motor protector for pumps, in particular to an aneroid anti-idling protector for pumps without setting. Background technique [0002] The existing special protectors for motors, pumps, etc. are set in advance according to the rated current of the load or the actual working current. When the working current exceeds or falls below the set value, it will start to protect. There are improper use or Inaccurate setting will result in false protection or non-protection, and some protectors adopt fixed value protection. There are many product specifications and large errors, and false protection or non-protection also occurs, especially when the pump is dry and the motor is idling very quickly. Quickly damage the pump blades. Contents of the invention [0003] The purpose of the present invention is to address the above defects, to provide a non-setting pump type aneroid anti-idling protector, which can greatly reduce product spec...

Claims

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Application Information

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IPC IPC(8): F04B49/10
Inventor 介国安
Owner STATE GRID CORP OF CHINA
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