CN216449925U

CN216449925U - Variable-frequency operation controller for carbonate continuous production equipment

Info

Publication number: CN216449925U
Application number: CN202123279780.2U
Authority: CN
Inventors: 王磊; 韩忠祥; 高伟杰; 左冬
Original assignee: Shida Shenghua Quanzhou Co ltd
Current assignee: Shida Shenghua Quanzhou Co ltd
Priority date: 2021-12-24
Filing date: 2021-12-24
Publication date: 2022-05-06
Anticipated expiration: 2031-12-24

Abstract

The utility model relates to the technical field of frequency conversion control, in particular to a frequency conversion operation controller for continuous production equipment of carbonic ester, which comprises a control circuit, a protection circuit and a frequency converter VVF, wherein the control circuit comprises a control loop power supply L11 and a control loop zero line N, a field operation column stop button SB1, a field operation column start button SB2, an intermediate relay KA2 and a parallel delay coil RT are connected between the control loop power supply L11 and the control loop zero line N in series, a starting and stopping signal contact of the frequency converter VVF is connected with a normally open auxiliary contact KA22 of an intermediate relay KA2 in parallel, and the protection circuit comprises a low-voltage fuse FU connected on the control loop power supply L11 in series and a tripping loop which is connected with the frequency converter VVF in parallel to protect a fault output contact of the frequency converter VVF and is connected with the fault relay KA4 in series. The process time from instant power failure of the equipment to restarting is within 1S, so that the restarting time of the equipment is greatly shortened, and the production continuity of the continuous production equipment of the carbonic ester is ensured.

Description

Variable-frequency operation controller for carbonate continuous production equipment

Technical Field

The utility model relates to the technical field of frequency conversion control, in particular to a frequency conversion operation controller for carbonate continuous production equipment.

Background

The continuous production equipment of the carbonic ester must keep continuous power supply in the production process, otherwise, the continuous production process and production devices with fine production process can be greatly influenced.

It is common for large and medium-sized refinery and chemical enterprises to have abnormal power failure or short-term power failure (commonly referred to as "power blackout") due to a fault or abnormality of an external power grid or an internal power supply network. At present, a frequency conversion control pump of an oil refinery enterprise is started and stopped mainly by the pull-in and the disconnection control of an alternating current intermediate relay, a control power supply of the alternating current intermediate relay is taken from any phase of a primary loop three-phase power supply, when the alternating current intermediate relay control power supply is subjected to power dazzling, the alternating current intermediate relay is subjected to voltage loss tripping so as to stop the frequency conversion control pump, an operator is required to restart the frequency conversion control pump on site, and power supply interruption or abnormity often causes equipment shutdown or idling, process flow interruption or waste generation, sometimes even causes serious consequences such as scrapping of production equipment.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the technical problems and provides a variable-frequency operation controller for a carbonate continuous production device.

In order to realize the purpose, the technical scheme adopted by the utility model is as follows: the utility model provides a frequency conversion operation controller for carbonic ester continuous production equipment, includes control circuit, protection circuit and converter VVF, control circuit includes control loop power L11 and control loop zero line N, and it has field operation post stop button SB1, field operation post start button SB2, auxiliary relay KA2 and parallelly connected delay coil RT to establish ties between control loop power L11 and the control loop zero line N, converter VVF's the parallelly connected auxiliary contact KA22 that intermediate relay KA2 was opened in start-stop signal contact, protection circuit include the low-voltage fuse FU of establishing ties on control loop power L11 and with converter VVF parallelly connected protection converter VVF's fault output contact and with the trip circuit of fault relay KA4 series connection.

Further, the low-voltage fuse FU is connected in series with the normally-open auxiliary contact KA41 of the fault relay KA4, and is connected in series with the field operating column stop button SB1, the field operating column start button SB2 and the intermediate relay KA 2.

Further, the on-site operation column starting button SB2 is connected with the normally open auxiliary contact KA21 of the intermediate relay KA2 in parallel, and is connected with the time delay disconnection auxiliary contact RT1 of the time delay coil RT in parallel, and the time delay coil RT is connected with two ends of the intermediate relay KA2 in parallel.

Further, a control end of the frequency converter VVF is connected with an operation expansion relay KA1 in series and is connected with the control circuit in parallel.

Further, the normally closed auxiliary contact KA11 of the operation expansion relay KA1 is connected with a green indicator lamp HG in series.

Further, a normally open auxiliary contact KA12 of the operation development relay KA1 is connected with a red indicator light HR in series.

Further, the tripping circuit comprises a normally closed auxiliary contact KA42 of a fault relay KA4 and a fault yellow indicator lamp HY connected in series with the normally closed auxiliary contact KA 42.

Furthermore, the type of the delay coil RT is Siemens 3RT1926-2FL21 delay coil.

From the above description of the present invention, it can be seen that the variable frequency operation controller for a continuous production facility of carbonic ester provided by the present invention has the following advantages compared with the prior art:

1. the frequency converter VVF is serially connected on the control circuit and can be used for adjusting the rotating speed of the motor and reducing the extra loss of the motor, and a fault output contact and a control end of the frequency converter VVF are connected with a tripping loop for protecting the frequency converter VVF in parallel, so that the frequency converter VVF is tripped and protected when the frequency converter VVF breaks down;

2. the control circuit comprises a low-voltage fuse FU which is used for fusing the control circuit when the secondary circuit is short-circuited so as to protect the control circuit;

3. when the voltage of a control power supply grid of the intermediate relay KA2 is instantaneously reduced, the coil of the intermediate relay KA2 loses voltage and is released, after the voltage in 1.5S returns to be normal, the intermediate relay KA2 can be normally operated again by means of the delay disconnection auxiliary RT1 of the delay coil RT, and due to the fact that the low-voltage time is generally within a millisecond level, even if the intermediate relay KA2 is instantaneously tripped, the equipment cannot be immediately stopped under the action of inertia, the process time from the instant power loss of the equipment to the restart of the equipment is within a 1S range, an operator does not need to start the equipment on site, the restart time of the equipment is greatly shortened, and the production continuity of the carbonate continuous production device is guaranteed.

Drawings

FIG. 1 is a circuit diagram of a variable frequency operation controller for a continuous production facility of carbonic acid ester according to the present invention.

Detailed Description

The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of this invention, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

As shown in FIG. 1, a frequency conversion operation controller for a carbonate continuous production device, comprises a control circuit, a protection circuit and a frequency converter VVF, wherein the control circuit comprises a control loop power supply L11 and a control loop zero line N, a field operation column stop button SB1, a field operation column start button SB2, an intermediate relay KA2 and a parallel delay coil RT are connected in series between the control loop power supply L11 and the control loop zero line N, a normally open auxiliary contact KA22 of a start-stop signal contact parallel intermediate relay KA2 of the frequency converter VVF is connected in parallel, and the protection circuit comprises a low-voltage fuse FU connected in series on the control loop power supply L11 and a tripping loop connected with a fault output contact of the frequency converter VVF in parallel protection and connected with the fault relay KA4 in series. The frequency converter VVF is arranged to adjust the rotating speed of the motor, extra loss of the motor is reduced, normal work of a control circuit is guaranteed, a tripping loop plays a role in protecting the frequency converter VVF, the frequency converter VVF is tripped and protected when the frequency converter VVF breaks down, a low-voltage fuse FU is connected in series in the control circuit, the control circuit is fused when a secondary loop is short-circuited to play a role in protecting the control circuit, the control circuit is used for releasing equipment power failure when a coil RT is subjected to voltage failure when the intermediate relay KA2 controls the power voltage to reduce time delay instantly, and the intermediate relay KA2 is powered on again to attract the equipment again after the voltage returns to be normal, so that the equipment is started again to run, and the production continuity of the device is guaranteed.

The low-voltage fuse FU is connected in series with normally open auxiliary contact KA41 of fault relay KA4 to be connected in series with field operation post stop button SB1, field operation post start button SB2 and auxiliary relay KA2, the normally open auxiliary contact KA21 of the parallelly connected auxiliary relay KA2 of field operation post start button SB2, and the time delay disconnection auxiliary contact RT1 of parallelly connected time delay coil RT, time delay coil RT is parallelly connected at the both ends of auxiliary relay KA 2.

Converter VVF's control end is connected in series has operation expansion relay KA1, and with control circuit is parallelly connected, the tripping operation return circuit includes fault relay KA 4's normally closed auxiliary contact KA42 and the trouble yellow indicator HY of establishing ties with normally closed auxiliary contact KA42, and when converter VVF breaks down, normally closed auxiliary contact KA42 is closed, and yellow indicator HY lights, plays tripping operation guard action to the converter, the normally closed auxiliary contact KA11 and the green indicator HG of operation expansion relay KA1 are established ties, the normally open auxiliary contact KA12 and the red indicator HR series connection of operation expansion relay KA 1.

When the utility model is used, when a motor needs to be started on site, a site operation column starting button SB2 is pressed, an intermediate relay KA2 is powered on and attracted, a normally closed auxiliary contact KA11 and a normally open auxiliary contact KA12 of a corresponding operation expansion relay KA1 act correspondingly, a green indicator lamp HG is turned off, a red indicator lamp HR is turned on, and a normally open auxiliary contact KA21 is attracted, so that a delay coil RT is powered on and attracted all the time when the site operation column starting button SB2 is reset, a delay coil RT is powered on while the intermediate relay KA2 is powered on, meanwhile, a delay disconnection auxiliary contact RT1 of the delay coil RT is closed, equipment is started, the site operation column stopping button SB1 is pressed and the delay time exceeding the delay coil RT is kept when the equipment is stopped, the stop button equipment is released after the delay disconnection auxiliary contact RT1 of the delay coil RT is disconnected, and the equipment is normally stopped, when the voltage of a power grid drops suddenly, the voltage 2 is released in 1S, and the normal time of the delay coil RT is recovered At the moment, the time delay opening auxiliary contact RT1 of the time delay coil RT is kept closed, so that the intermediate relay KA2 is immediately electrified and sucked, and the equipment operates again.

As can be seen from the above description of the present invention, compared with the prior art, in the frequency conversion operation controller for a continuous production facility of carbonate provided by the present invention, the frequency converter VVF is serially connected to the control circuit, and can be used to adjust the rotation speed of the motor and reduce the extra loss of the motor, and the fault output contact and the control end of the frequency converter VVF are connected in parallel with a trip circuit for protecting the frequency converter VVF, so as to perform a trip protection function on the frequency converter VVF when the frequency converter VVF is in fault; the control circuit comprises a low-voltage fuse FU which is used for fusing the control circuit when the secondary circuit is short-circuited so as to protect the control circuit; when the voltage of a control power supply grid of the intermediate relay KA2 is instantaneously reduced, the coil of the intermediate relay KA2 loses voltage and is released, after the voltage in 1.5S returns to be normal, the intermediate relay KA2 can be normally operated again by means of the delay disconnection auxiliary RT1 of the delay coil RT, and due to the fact that the low-voltage time is generally within a millisecond level, even if the intermediate relay KA2 is instantaneously tripped, the equipment cannot be immediately stopped under the action of inertia, the process time from the instant power loss of the equipment to the restart of the equipment is within a 1S range, an operator does not need to start the equipment on site, the restart time of the equipment is greatly shortened, and the production continuity of the carbonate continuous production device is guaranteed.

The above description is only a few specific embodiments of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by the design concept should fall within the scope of the present invention.

Claims

1. A variable frequency operation controller for a carbonate continuous production device is characterized in that: including control circuit, protection circuit and converter VVF, control circuit includes control circuit power L11 and control circuit zero line N, and it has field operation post stop button SB1, field operation post start button SB2, auxiliary relay KA2 and parallelly connected delay coil RT to establish ties between control circuit power L11 and the control circuit zero line N, converter VVF's the parallelly connected auxiliary contact KA22 of auxiliary relay KA2 of start-stop signal contact, protection circuit including establish ties on control circuit power L11 low-voltage fuse FU and with converter VVF's the parallelly connected protection converter VVF's fault output contact and with the trip circuit of fault relay KA4 series connection.

2. The variable frequency operation controller for a carbonate continuous production apparatus according to claim 1, characterized in that: the low-voltage fuse FU is connected in series with a normally open auxiliary contact KA41 of a fault relay KA4, and is connected in series with a field operating column stop button SB1, a field operating column start button SB2 and an intermediate relay KA 2.

3. The variable-frequency operation controller for a carbonate continuous production apparatus according to claim 1 or 2, characterized in that: the on-site operation post start button SB2 is parallelly connected auxiliary contact KA21 that normally opens of auxiliary relay KA2 to parallelly connected time delay coil RT's time delay disconnection auxiliary contact RT1, time delay coil RT is parallelly connected at auxiliary relay KA2 both ends.

4. The variable frequency operation controller for a carbonate continuous production apparatus according to claim 1, characterized in that: and a control end of the frequency converter VVF is connected with an operation expansion relay KA1 in series and is connected with the control circuit in parallel.

5. The variable-frequency operation controller for a carbonate continuous production apparatus according to claim 4, characterized in that: the normally closed auxiliary contact KA11 of the operation expansion relay KA1 is connected with a green indicator light HG in series.

6. The variable-frequency operation controller for a carbonate continuous production apparatus according to claim 4, characterized in that: and a normally open auxiliary contact KA12 of the operation expansion relay KA1 is connected with a red indicator light HR in series.

7. The variable frequency operation controller for a carbonate continuous production apparatus according to claim 1, characterized in that: the trip circuit includes a normally closed auxiliary contact KA42 of a fault relay KA4 and a fault yellow indicator light HY in series with the normally closed auxiliary contact KA 42.

8. The variable frequency operation controller for a carbonate continuous production apparatus according to claim 1, characterized in that: the type of the delay coil RT is Siemens 3RT1926-2FL21 delay coil.