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Automatic vacuum breaking shutoff control circuit of roots vacuum unit

A technology for controlling circuits and vacuum units, which is applied in the direction of motor generator control, multiple AC motor control, control systems, etc., can solve problems such as unit damage, and achieve the effects of improved safety performance and simple operation

Pending Publication Date: 2018-05-25
ZHEJIANG JIANFENG PHARM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a Roots vacuum unit automatic breakage shutdown control circuit to overcome the problem of unit damage caused by misoperation in the prior art

Method used

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  • Automatic vacuum breaking shutoff control circuit of roots vacuum unit
  • Automatic vacuum breaking shutoff control circuit of roots vacuum unit

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Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0019] Such as figure 2 Shown is a Roots vacuum pump automatic breakage stop control circuit according to an embodiment of the present invention, including a water ring pump start and stop control circuit for controlling the start and stop of the water ring pump. It specifically includes the start button SB1, one end of which is connected to the phase line L1 of the three-phase electricity, one end of the normally closed auxiliary contact of the first contactor KM1, the other end is connected to the other end of the normally closed auxiliary contact of the first contactor, and the fourth relay KA4...

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Abstract

The invention discloses an automatic vacuum breaking shutoff control circuit of a roots vacuum unit. The automatic vacuum breaking shutoff control circuit comprises a water ring pump start / stop control circuit for controlling the start and stop of a water ring pump, a roots vacuum pump start / stop control circuit connected to the water ring pump start / stop control circuit and a solenoid valve control circuit. The roots vacuum pump start / stop control circuit includes a first electrical contact vacuum meter, a second electrical contact vacuum meter and a solenoid valve, a roots vacuum pump is started when vacuum degree reaches the upper limit of the first electrical contact vacuum meter and is stopped when the vacuum degree reaches the lower limit of the first electrical contact vacuum meter,and the second electrical contact vacuum meter and the solenoid valve are respectively installed on a vacuum pipeline. The solenoid valve control circuit includes a stop button, the electromagnetic valve is actuated and starts to break vacuum when the stop button is pressed, the solenoid valve is turned off and the water ring pump is stopped when the vacuum degree reaches the lower limit of the second electrical contact vacuum meter. According to the automatic vacuum breaking shutoff control circuit, the automatic vacuum breaking shutoff of a vacuum system can be achieved by only one manual operation, the damage of the unit caused by misoperation of directly pressing the stop button without vacuum breaking is effectively prevented, operation is simple, and safety performance is greatly improved.

Description

technical field [0001] The invention relates to the technical field of vacuum equipment, in particular to a control circuit for automatic breaking and stopping of a Roots vacuum unit. Background technique [0002] Roots vacuum pump refers to a variable displacement vacuum pump that is equipped with two leaf-shaped rotors that rotate synchronously in opposite directions. Roots vacuum pumps are widely used in petroleum, chemical, metallurgy, textile, pharmaceutical and other industries. [0003] Such as figure 1 Shown is the control circuit of the existing Roots vacuum unit, including the start and stop control circuit of the water ring pump, including the start knob SB1, the stop button SB2, the first contactor KM1 and the first thermal relay FR1, which are used to control the start and stop of the water ring pump. Stop; the Roots vacuum pump start-stop control circuit connected to the water ring pump start-stop control circuit includes a start knob SA1, a first electric co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P1/54H02P3/00H02P5/74
CPCH02P1/54H02P3/00H02P5/74
Inventor 吴广军沈泉郑昆武童小军
Owner ZHEJIANG JIANFENG PHARM CO LTD
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