CN214837047U

CN214837047U - Energy-saving system for frequency conversion transformation of air compressor

Info

Publication number: CN214837047U
Application number: CN202120499460.9U
Authority: CN
Inventors: 姚锋; 魏光磊
Original assignee: Change Industry Equipment Co ltd
Current assignee: Change Industry Equipment Co ltd
Priority date: 2021-03-09
Filing date: 2021-03-09
Publication date: 2021-11-23
Anticipated expiration: 2031-03-09

Abstract

The utility model discloses an economizer system for air compressor machine frequency conversion is reformed transform relates to air compressor machine converter and reforms transform the field. The utility model comprises a main loop and a control loop of the air compressor variable frequency energy-saving system; the main loop comprises an air compressor power supply, an inlet wire air switch, a frequency converter, a first contactor, a second contactor, an output reactor and an air compressor inlet wire end wiring terminal; the control loop comprises a human-computer interface, a main controller, a pressure sensor, a motor temperature sensor and a frequency converter. The utility model discloses an economizer system that air compressor machine frequency conversion was reformed transform with HMI human-computer interface, contactor, master controller, motor temperature sensor can realize human-computer interface control, be responsible for pressure auto-induction and automatic control, be responsible for the effect of temperature automatic monitoring, and it is low to have the debugging degree of difficulty, and work efficiency and security are high advantage.

Description

Energy-saving system for frequency conversion transformation of air compressor

Technical Field

The utility model belongs to air compressor machine converter reforms transform the field, especially relates to an economizer system for air compressor machine frequency conversion reforms transform.

Background

The utility model provides a PID function that the converter that present air compressor machine frequency conversion transformation mostly utilized is from taking is adjusted, pressure sensor installs on air compressor machine outlet duct trunk line, pressure sensor connects to converter analog quantity AI2 input through 4-20MA current signal, HMI human-computer interface passes through the RS485 signal and is connected with the converter, HMI main communication converter electric current, voltage, frequency, power isoparametric, write the constant pressure value through the RS485 communication simultaneously and give the inside PID of converter as the reference, thereby the converter passes through pressure sensor's feedback value and HMI given value contrast and adjusts the frequency according to inside PID control compressor owner motor meaning.

The frequency conversion transformation of the existing air compressor has the following defects: 1. the debugging difficulty is high, and operators are required to have certain professional ability due to the fact that the frequency converters in the existing market are various in types and more communication addresses need to be set for data acquisition, data giving and feedback; 2. the constant voltage effect is poor, the frequency converter is a general electric element, the PID control in the frequency converter is adopted, the control is rough, and the voltage can be regulated only within a certain range; 3. the security is poor, and after the frequency conversion transformation frequency modulation, the motor has certain temperature rise, and motor speed, converter carrier frequency, electric wire netting harmonic etc. all can influence the motor temperature rise, and current transformation mode can not detect the motor temperature. Therefore, the energy-saving system for frequency conversion transformation of the air compressor is provided to solve the problems and is of great significance.

SUMMERY OF THE UTILITY MODEL

The utility model provides an economizer system for air compressor machine frequency conversion reforms transform has solved above problem.

In order to solve the technical problem, the utility model discloses a realize through following technical scheme:

the utility model discloses an economizer system for air compressor frequency conversion transformation, which comprises a main loop and a control loop of the air compressor frequency conversion economizer system;

the main loop comprises an air compressor power supply, an inlet wire air switch, a frequency converter, a first contactor, a second contactor, an output reactor, an air compressor inlet wire end wiring terminal and a second wiring terminal;

the control loop comprises a human-computer interface, a main controller, a pressure sensor, a motor temperature sensor and a frequency converter;

the upper end of the first contactor is connected to the lower end of the inlet air switch through a power line, and the lower end of the first contactor is connected with the lower end of the output reactor through the power line, led to a connecting terminal of the inlet end of the air compressor and used for switching to a power frequency loop;

the upper end of the second contactor is connected to the output end of the output reactor through a power line, and the lower end of the second contactor is connected with the lower end of the first contactor through the power line and led to a wiring terminal of an air compressor inlet end for switching to a frequency conversion loop.

Furthermore, the input end of the output reactor is connected to the output end of the frequency converter through a power line, and the output end of the output reactor is connected to the upper end of the second contactor and used for filtering harmonic waves output by the frequency converter and protecting the motor.

Furthermore, the human-computer interface is installed on a door panel of a control cabinet of the air compressor variable-frequency energy-saving system, is connected with the main controller through a communication line and is used for displaying real-time data and operation parameter setting of the system.

Furthermore, the main controller is installed in a control cabinet of the air compressor variable-frequency energy-saving system, is in communication connection with a human-computer interface and is in communication connection with the frequency converter through RS485, and is used for PID operation and system parameter protection.

Furthermore, the pressure sensor is installed on a compressed air main pipeline at the outlet of the air compressor, is connected with the main controller through a 4-20ma signal and is used for PID feedback.

Further, motor temperature sensor adsorbs both ends around the air compressor machine motor through strong magnetism, is connected with the master controller through the signal line for motor temperature after the monitoring transformation.

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

the utility model discloses an economizer system that air compressor machine frequency conversion was reformed transform with HMI human-computer interface, contactor, master controller, motor temperature sensor can realize human-computer interface control, be responsible for pressure auto-induction and automatic control, be responsible for the effect of temperature automatic monitoring, and it is low to have the debugging degree of difficulty, and work efficiency and security are high advantage.

Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a structural diagram of a main loop of an energy-saving system for frequency conversion transformation of an air compressor of the utility model;

FIG. 2 is a structural diagram of a control loop of an energy-saving system for frequency conversion modification of an air compressor of the present invention;

FIG. 3 is a structural diagram of a frequency conversion modification control of an existing air compressor;

in the drawings, the components represented by the respective reference numerals are listed below:

QF 1-incoming line air switch, VSD-frequency converter, KM 1-first contactor, KM 2-second contactor, OCL-output reactor, XT 1-air compressor incoming line terminal, XT 2-second terminal, HM 1-human-computer interface, T3 VF-main controller and VSD-frequency converter.

Detailed Description

The technical solutions in the embodiments of 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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "upper end", "lower end", "input end", "front and rear ends", etc., indicate an orientation or positional relationship, merely for convenience of description and simplicity of description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

As shown in fig. 3, the detailed structure and the disadvantages of the frequency conversion modified structure of the existing air compressor are clearly described in the background art in this specification, and are not described herein again; to solve the problems in the background art, the following embodiments are specifically implemented;

referring to fig. 1-2, the energy saving system for frequency conversion modification of an air compressor of the present invention includes a main loop and a control loop of the frequency conversion energy saving system of the air compressor;

the main loop comprises an air compressor power supply, an inlet air switch QF1, a frequency converter VSD, a first contactor KM1, a second contactor KM2, an output reactor OCL, an air compressor inlet end wiring terminal XT1 and a second wiring terminal XT 2;

the control loop comprises a human-computer interface HM1, a master controller T3VF, a pressure sensor, a motor temperature sensor and a frequency converter VSD;

the upper end of the first contactor KM1 is connected to the lower end of the inlet air switch QF1 through a power line, the lower end of the first contactor KM1 is connected with the lower end of the output reactor OCL through the power line, and the lower end of the first contactor KM1 is led to a connecting terminal XT1 at the inlet end of the air compressor and used for being switched to a power frequency loop;

the upper end of the second contactor KM2 is connected to the output end of the output reactor OCL through a power line, and the lower end of the second contactor KM2 is connected with the lower end of the first contactor KM1 through the power line and led to an air compressor inlet end wiring terminal XT1 for switching to a frequency conversion loop.

Wherein, output reactor OCL's input is connected to the output of converter VSD through the power cord, and output reactor OCL's output is connected to the upper end of second contactor KM2 for filter converter output harmonic, the protection motor.

The human-computer interface HM1 is installed on a door panel of a control cabinet of the air compressor variable-frequency energy-saving system, is connected with the main controller T3VF through a communication line and is used for displaying real-time data of the system and setting operation parameters.

The main controller T3VF is installed in a control cabinet of the air compressor variable-frequency energy-saving system, is in communication connection with a man-machine interface HM1 and is in communication connection with the frequency converter VSD through RS485, and is used for PID operation and system parameter protection.

The pressure sensor is arranged on a compressed air main pipeline at the outlet of the air compressor, is connected with the main controller T3VF through 4-20ma signals and is used for PID feedback.

Wherein, motor temperature sensor passes through strong magnetism and adsorbs both ends around the air compressor machine motor, is connected with master controller T3VF through the signal line for motor temperature after the monitoring transformation.

The utility model discloses a theory of operation:

before the air compressor frequency converter energy-saving system runs, a working mode needs to be preset in a human-computer interface HMI, if power frequency is selected, after the system is started, the first contactor KM1 acts, after the air compressor is started, the air compressor is started according to an original star-delta switching circuit, and the air compressor motor runs in the power frequency mode. If frequency conversion is selected, the second contactor KM2 acts, after the air compressor is started, the star-delta circuit is switched, the frequency converter starts to operate, the main controller T3VF controls the output frequency of the frequency converter in an RS485 communication mode through internal PID operation according to the comparison between the real-time monitored main pressure value of the air compressor and the set constant pressure value in the system, and therefore the rotating speed of the motor is controlled, and the purpose of controlling the main pressure is achieved.

Motor temperature sensor passes through strong magnetism and adsorbs both ends around the air compressor machine motor, is connected with master controller T3VF through the signal line for motor temperature after the monitoring transformation, motor temperature surpasss the early warning value, and system alarm suggestion, motor temperature surpass the limit value, and system alarm is shut down, thereby the protection motor is not the operation of overtemperature.

The main controller T3VF is the special controller of air compressor machine, and its frequency converter communication protocol of the main stream of tens kinds of markets of integration can be called according to the demand, has shortened the debugging time, and its exclusive PID operation logic of ordering for the air compressor machine can both accurately be adjusted under the operating condition of difference, and pipeline pressure fluctuation maintains at 0.1 Bar.

The main controller T3VF reserves multi-channel analog input points and fault output points, which can be defined by itself according to the need, and the protection function is more comprehensive.

Has the advantages that:

The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An energy-saving system for frequency conversion transformation of an air compressor is characterized by comprising a main loop and a control loop of the frequency conversion energy-saving system of the air compressor;

the main loop comprises an air compressor power supply, a lead-in air switch (QF1), a frequency converter (VSD), a first contactor (KM1), a second contactor (KM2), an output reactor (OCL) and an air compressor lead-in terminal connecting terminal (XT 1);

the control loop comprises a human-computer interface (HM1), a main controller (T3VF), a pressure sensor, a motor temperature sensor and a frequency converter (VSD);

the upper end of the first contactor (KM1) is connected to the lower end of an inlet air switch (QF1) through a power line, and the lower end of the first contactor (KM1) is connected with the lower end of an output reactor (OCL) through the power line and led to a connecting terminal (XT1) of an inlet end of an air compressor for switching to a power frequency loop;

the upper end of the second contactor (KM2) is connected to the output end of the output reactor (OCL) through a power line, and the lower end of the second contactor is connected with the lower end of the first contactor (KM1) through the power line and led to a wiring terminal (XT1) of the inlet end of the air compressor for switching to a frequency conversion loop.

2. The energy-saving system for variable frequency modification of the air compressor as claimed in claim 1, wherein the input end of the output reactor (OCL) is connected to the output end of the frequency converter (VSD) through a power line, and the output end of the output reactor (OCL) is connected to the upper end of the second contactor (KM2) for filtering the output harmonic wave of the frequency converter and protecting the motor.

3. The energy-saving system for variable-frequency modification of the air compressor as claimed in claim 1, wherein the human-machine interface (HM1) is installed on a door panel of a control cabinet of the variable-frequency energy-saving system of the air compressor, is connected with the main controller (T3VF) by a communication line, and is used for displaying real-time data and operation parameter settings of the system.

4. The energy-saving system for the frequency conversion transformation of the air compressor as claimed in claim 1, wherein the main controller (T3VF) is installed in a control cabinet of the frequency conversion energy-saving system of the air compressor, is in communication connection with a human-computer interface (HM1) and is in communication connection with a frequency converter (VSD) through RS485, and is used for PID operation and system parameter protection.

5. The energy-saving system for variable frequency modification of the air compressor as claimed in claim 1, wherein the pressure sensor is installed on a main compressed air pipe at the outlet of the air compressor and is connected with a main controller (T3VF) through a 4-20ma signal for PID feedback.

6. The energy-saving system for frequency conversion modification of the air compressor as claimed in claim 1, wherein the motor temperature sensors are adsorbed at the front and rear ends of the motor of the air compressor through strong magnetism and connected with a main controller (T3VF) through a signal line for monitoring the temperature of the modified motor.