CN217215956U

CN217215956U - Control system for preventing foam pump from evacuating

Info

Publication number: CN217215956U
Application number: CN202220245555.2U
Authority: CN
Inventors: 司传煜; 岳德兵; 王来发; 张乃湛; 王绍武
Original assignee: Shandong Hengxin Gaoke Energy Co ltd
Current assignee: Shandong Hengxin Gaoke Energy Co ltd
Priority date: 2022-01-30
Filing date: 2022-01-30
Publication date: 2022-08-16
Anticipated expiration: 2032-01-30

Abstract

The utility model relates to a control system for preventing a foam pump from being pumped out, which belongs to the technical field of foam pump control in the auxiliary salt workshop section of a chemical production branch plant; the foam pump motor control device comprises a foam pump motor, a stop button, a start button and an anti-emptying control device, wherein the power supply end of the foam pump motor is connected with a power supply through a contactor and a relay, the power supply end of the foam pump motor is also connected with a current transformer, the current transformer is connected with the anti-emptying control device, the anti-emptying control device is connected with the stop button and the start button, and the anti-emptying control device is also connected with a normally open contact of the relay, a coil and a normally closed contact of the contactor; the foam pump motor state monitoring device is used for monitoring the state of a foam pump motor under the conditions that PLC control is not available, liquid in a volume has large foam, the liquid in the volume must be emptied, and a liquid level meter cannot accurately observe, and is high in novel practicability; when the method is adopted to control the foam pump motor, the time and the labor are saved, the operation is convenient, and the design cost is low.

Description

Control system for preventing foam pump from pumping out

Technical Field

The utility model relates to a control system that prevents foam pump to manage to find time belongs to the vice salt workshop section foam pump control technical field of chemical industry branch factory.

Background

And the ammonia water reflux pump and the foam pump on site in the secondary salt working section of the chemical product plant are used for transferring materials in the state of sealing the storage tank. The accurate liquid level in jar can't be looked over to operating personnel's accuracy, can not remain liquid in the jar, guarantees the evacuation of jar interior material. The operator judges that the material is emptied by the pressure drop of the outlet pressure gauge of the foam pump or the running sound of the pump. The disadvantages of this mode of operation: (1) the material foaminess is stronger, and the real liquid level in the tank cannot be judged; (2) the lower opening of the storage tank is provided with an end socket, so that the liquid level condition cannot be accurately judged; (3) the residual materials in the storage tank are hung on the wall, so that the materials are difficult to clean; (4) the difficulty of controlling the material transfer of the pump through a foam pump outlet pressure gauge is high; (5) the material transfer of the pump is controlled by the sound of the foam pump, so that the mechanical seal of the foam pump is damaged; (6) the control requirement of operators on the foam pump is high, and the operation difficulty is high; (7) the occupied time is long when the operators transfer the materials; (8) the maintenance cost of the foam pump is high.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the control system for preventing the foam pump from being pumped out is automatically controlled without manpower, so as to solve the problems in the background art.

Prevent control system that foam pump managed to find time, including foam pump motor, stop button, start button and prevent control device that evacuates, the power supply end of foam pump motor passes through contactor and relay connection power, the power supply end of foam pump motor still is connected with current transformer, and current transformer connects and prevents control device that evacuates, prevent that control device that evacuates connects stop button and start button, prevent that control device that evacuates still connects the normally closed contact of normally open contact, coil and the contactor of relay.

The current of the power supply end of the foam pump motor is detected through the current transformer, when the foam pump motor is about to pump out materials in a tank, the current of the current transformer starts to fluctuate and reduce, when the current is reduced to a current set value, the current delay time installed in the evacuation-proof control device starts to count down, and when the delay time reaches the time set value, the evacuation-proof control device disconnects the contactor and stops the foam pump motor. Whether the foam pump motor is evacuated or not is judged through the evacuation prevention control device, and the foam pump evacuation prevention function is realized through automatic control without manpower.

Preferably, the input end of the anti-pumping-out control device is connected with a current transformer, and the output end of the anti-pumping-out control device is connected with a coil of the relay and a normally closed contact of the contactor.

The anti-pumping-out control device detects the current of the power supply end of the foam pump motor through the current transformer, judges that the foam pump motor is pumped out, controls the normally closed contact of the contactor to be disconnected, stops the foam pump motor through the contactor, cuts off the power of the coil of the relay, and enables the normally open contact of the relay to be normally opened and the relay to be disconnected.

Preferably, the stop button is connected to the power line L3 through a fuse.

The fuse prevents that the electric current is too big, prevents that evacuation controlling means is invalid.

Preferably, the contactor and the relay are connected to a power source through a circuit breaker.

The circuit breaker is used for leakage circuit breaking and protecting the safety of a site.

Preferably, the power supply is a three-phase alternating current power supply.

The foam pump motor is powered using a three-phase ac power supply.

Preferably, the anti-pumping-out control device adopts an under-current controller.

The under-current controller has mature product, low price and good control effect.

Compared with the prior art, the utility model discloses following beneficial effect has:

the control system for preventing the foam pump from being pumped out is used for monitoring the state of the foam pump motor under the conditions that the PLC is not available, the liquid foam in the volume is large, the liquid in the volume must be emptied and the liquid level meter cannot accurately observe, and has strong practicability; when the method is adopted to control the foam pump motor, the time and the labor are saved, the operation is convenient, and the design cost is low.

Drawings

FIG. 1 is a schematic view of the mounting structure of a control system for preventing evacuation of a foam pump according to the present invention;

fig. 2 is an electrical schematic diagram of a control system for preventing pump out of a foam pump according to the present invention.

Wherein: 1. a circuit breaker; 2. a relay; 2-1, normally open contact; 2-2, a coil; 3. a contactor; 3-1, normally closed contacts; 4. a current transformer; 5. a foam pump motor; 6. an anti-evacuation control device; 7. a stop button; 8. a start button; 9. and a fuse.

Detailed Description

The invention will be further described with reference to the accompanying drawings:

example 1

As shown in fig. 1-2, prevent control system that foam pump was managed to find time, including foam pump motor 5, stop button 7, start button 8 and prevent evacuation controlling means 6, the power supply end of foam pump motor 5 passes through contactor 3 and relay 2 and connects the power, the power supply end of foam pump motor 5 still is connected with current transformer 4, and current transformer 4 connects and prevents evacuation controlling means 6, prevent evacuation controlling means 6 and connect stop button 7 and start button 8, prevent evacuation controlling means 6 still connects normally open contact 2-1 of relay 2, coil 2-2 and the normally closed contact 3-1 of contactor 3.

The current of the power supply end of the foam pump motor 5 is detected through the current transformer 4, when the foam pump motor 5 needs to pump out materials in a tank, the current of the current transformer 4 starts to fluctuate and reduce, when the current is reduced to a current set value, the current delay time installed in the anti-pumping control device 6 starts to count down, and when the delay time reaches a time set value, the anti-pumping control device 6 disconnects the contactor 3 and stops the foam pump motor 5. Whether the foam pump motor 5 is evacuated or not is judged through the evacuation prevention control device 6, and the evacuation prevention function of the foam pump is realized under the automatic control and without manual work.

Here, the stop button 7 is used to reset the anti-evacuation control device 6, and the start button 8 is used to start the anti-evacuation control device 6.

As shown in fig. 2, the input end of the anti-pumping-out control device 6 is connected with the current transformer 4, and the output end of the anti-pumping-out control device 6 is connected with the coil 2-2 of the relay 2 and the normally closed contact 3-1 of the contactor 3.

The anti-emptying control device 6 detects the current of the power supply end of the foam pump motor 5 through the current transformer 4, and judges that the foam pump motor 5 is emptied, the anti-emptying control device 6 controls the normally closed contact 3-1 of the contactor 3 to be disconnected, the foam pump motor 5 is stopped through the contactor 3, the coil 2-2 of the relay 2 is powered off, the normally open contact 2-1 of the relay 2 is normally opened again, and the relay 2 is also disconnected.

To protect the anti-evacuation control device 6, the stop button 7 is connected to a power line L3 through a fuse 9.

The fuse 9 prevents the current from being too large and the evacuation control device 6 from failing.

In order to protect the field safety, the contactor 3 and the relay 2 are connected to a power source through the circuit breaker 1.

The circuit breaker 1 is used for leakage circuit breaking and protecting the safety of a site.

The power supply adopts a three-phase alternating current power supply, the foam pump motor 5 is used for driving the foam pump to work, and the foam pump can adopt a centrifugal pump.

The foam pump motor 5 is powered using a three-phase ac power supply.

Specifically, the evacuation-proof control device 6 is an under-current controller.

Prevent the control system that the foam pump managed to find time, the theory of operation as follows:

according to the principle of conveying materials by the foam pump, when the foam pump is emptied, the flow is minimum, the shaft power of the foam pump motor 5 is minimum, so that the running current of the foam pump is reduced, and the emptying of the tank materials is judged by monitoring the running current of the foam pump motor 5 and stopping the pump in a delayed manner.

Prevent the control system that the foam pump managed to find time, the working process is as follows:

when starting the pump, check whether the valve state of the foam pump motor 5 is normal. Pressing stop button 7 first resets anti-empty control 6, and pressing start button 8 within 3 seconds starts foam pump motor 5. The foam pump motor 5 was observed to run properly.

In operation, when the foam pump motor 5 is about to evacuate the materials in the tank, the current detected by the current transformer 4 starts to fluctuate and decreases to a set value, the current delay time starts to count down, and when the delay time reaches the set value, the anti-evacuation control device 6 disconnects the contactor 3 and stops the foam pump motor 5. And judging whether the foam pump is evacuated or not, and realizing the function of preventing the evacuation of the foam pump.

To sum up, the control system for preventing the foam pump from being pumped out is used for monitoring the state of the foam pump motor 5 under the conditions that the PLC is not available, the liquid in the volume has large foam, the liquid in the volume must be pumped out, and the liquid level meter cannot accurately observe, and has strong novel practicability; when the method is adopted to control the foam pump motor 5, the time and the labor are saved, the operation is convenient, and the design cost is low.

Claims

1. The utility model provides a control system that prevents foam pump to find time, characterized in that, includes foam pump motor (5), stop button (7), start button (8) and prevents evacuation controlling means (6), the power supply end of foam pump motor (5) passes through contactor (3) and relay (2) and connects the power, the power supply end of foam pump motor (5) still is connected with current transformer (4), and current transformer (4) connect and prevent evacuation controlling means (6), prevent evacuation controlling means (6) and connect stop button (7) and start button (8), prevent evacuation controlling means (6) still connect normally open contact (2-1) of relay (2), coil (2-2) and normally closed contact (3-1) of contactor (3).

2. A control system for preventing foam pump evacuation as claimed in claim 1, characterized in that the input of the evacuation prevention control device (6) is connected to a current transformer (4), and the output of the evacuation prevention control device (6) is connected to the coil (2-2) of the relay (2) and the normally closed contact (3-1) of the contactor (3).

3. A control system to prevent evacuation of the foam pump according to claim 1 or 2, characterized in that the stop button (7) is connected to a power line L3 through a fuse (9).

4. A control system to prevent foam pump evacuation as claimed in claim 3 wherein the contactor (3) and relay (2) are connected to a power supply via a circuit breaker (1).

5. A control system for preventing evacuation of a foam pump according to claim 3, wherein the power supply is a three-phase ac power supply.

6. A control system for preventing evacuation of a foam pump according to claim 3, characterised in that the evacuation prevention control means (6) employs an under current control.