CN113374679B - Compressor protection method - Google Patents

Compressor protection method Download PDF

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Publication number
CN113374679B
CN113374679B CN202110836444.9A CN202110836444A CN113374679B CN 113374679 B CN113374679 B CN 113374679B CN 202110836444 A CN202110836444 A CN 202110836444A CN 113374679 B CN113374679 B CN 113374679B
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compressor
voltage
power
running
temperature
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CN113374679A (en
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张龙飞
刘运中
张天富
陈曦
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Changhong Huayi Compressor Co ltd
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Changhong Huayi Compressor Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/10—Other safety measures

Abstract

The invention relates to the field of protection of compressors of refrigeration appliances, in particular to a compressor protection method, which realizes accurate protection of the compressors and greatly reduces the risk of misjudgment. The technical scheme comprises the following steps: detecting and judging the power frequency and the power voltage of the compressor before the compressor is started, detecting and judging the shell temperature of the compressor after the conditions are met, starting the compressor if the conditions are met, acquiring the current and the voltage when the compressor is started, calculating the equivalent impedance when the compressor is locked, acquiring the voltage, the current and the shell temperature of the compressor in the normal running process in real time after the compressor is started, calculating the equivalent impedance when the compressor runs according to the voltage and the current acquired in the normal running process of the compressor in real time, monitoring the equivalent impedance in real time when the compressor runs, and cutting off a corresponding switch of the compressor if the equivalent impedance in the running is reduced at a rate greater than a threshold value and the difference value between the equivalent impedance in the running and the equivalent impedance in the locked-up process is smaller than the threshold value difference value. The invention is suitable for compressor protection.

Description

Compressor protection method
Technical Field
The invention relates to the field of protection of compressors of refrigeration appliances, in particular to a method for protecting a compressor.
Background
The traditional constant-frequency refrigerator compressor adopts a current type starter or a PTC starter as a starting device, and a thermal protector as a protection device to provide protection capability for the compressor; however, the traditional mechanical starter and protector have the defects of high parameter dispersion, poor compatibility, high operation power consumption and the like due to the limitation of the characteristics of the traditional mechanical starter and protector.
In the prior art, for example, CN112228327A discloses "an intelligent control system and method for electronic start controller", based on the original starting device, a protection switch (e.g., a relay) is used to replace a thermal protector, and a starting switch (e.g., a relay) is used to replace a heavy hammer or a PTC, and the protection state is identified by a method of sampling current, voltage, and shell temperature.
However, the protection method module adopts a fixed threshold method when the voltage protection is judged, which is not beneficial to fully exerting the load capacity of the motor; the current and voltage judgment adopts a method of comparing the current and voltage with reference current and voltage, the protection judgment depends on the initial current value, and the risk of misjudgment is caused; because the temperature of the shell of the compressor is not uniformly distributed, the protection of the shell temperature is also greatly limited.
Disclosure of Invention
The invention aims to provide a compressor protection method, which realizes accurate protection of a compressor and greatly reduces the risk of misjudgment.
The invention adopts the following technical scheme to realize the aim, and the compressor protection method comprises the following steps:
step 1, detecting the power frequency and the power voltage of a compressor before the compressor is started;
step 2, judging the power frequency and the power voltage, if the power frequency is greater than a first threshold frequency or the power frequency is less than a second threshold frequency, and the power voltage is greater than a first threshold voltage or the power voltage is less than a second threshold voltage, prohibiting the compressor from starting, otherwise, entering step 3, wherein the first threshold frequency is greater than the second threshold frequency, and the first threshold voltage is greater than the second threshold voltage;
step 3, detecting and judging the temperature of the shell of the compressor, if the temperature of the shell of the compressor is greater than the first threshold value, forbidding the start of the compressor, and otherwise, entering the step 4;
step 4, starting the compressor;
step 5, collecting the current and voltage when the compressor is started, and calculating the equivalent impedance when the compressor is locked;
step 6, acquiring voltage, current and compressor shell temperature in the normal operation process of the compressor in real time after the compressor is started;
step 7, calculating the equivalent impedance of the compressor during operation according to the voltage and current acquired in real time during the normal operation of the compressor;
step 8, monitoring the equivalent impedance in real time during running, and entering step 10 if the equivalent impedance in running is reduced at a rate greater than a threshold value and the difference value between the equivalent impedance in running and the equivalent impedance in locked rotor is smaller than a threshold value difference value, or entering step 9;
step 9, monitoring the temperature of the shell of the compressor in real time during operation, and entering step 10 if the temperature of the shell of the compressor is higher than a second threshold shell temperature which is not lower than the first threshold shell temperature;
and step 10, cutting off a corresponding switch of the compressor, and carrying out corresponding fault prompt.
Further, the compressor protection method further includes: and 11, setting corresponding reset time according to different fault types, and entering the step 1 after the corresponding reset time.
Further, in step 6, after the compressor is started, the method further includes:
collecting the running current and voltage of the compressor in a set time period, calculating the first running power P1 of the compressor according to the running current and voltage, simultaneously collecting the first evaporation temperature and the first return air temperature of the compressor, and determining the first suction density R1 of the compressor according to the first evaporation temperature, the first return air temperature and a refrigerant state equation;
collecting the running current and voltage of the compressor at a set time point, calculating second running power P2 of the compressor according to the running current and voltage, simultaneously collecting a second evaporation temperature and a second return air temperature of the compressor, and determining a second suction air density R2 of the compressor according to the second evaporation temperature, the second return air temperature and a refrigerant state equation;
comparing the first operation power P1 and the first air suction density R1 in the set time with the second operation power P2 and the second air suction density R2 at the set time, if P2/R2 is more than m (P1/R1), entering step 10, and m is more than 0.
Further, in step 7, the method further includes:
calculating the running power P of the compressor according to the voltage and current acquired in real time in the normal running process of the compressor, recording the values of all the running power P in the previous n times of running, and calculating the reference power of the previous n times of running of the compressor by a weighted average method
Figure SMS_1
The reference power is compared when the compressor is operated n +1 times>
Figure SMS_2
And the current real-time power->
Figure SMS_3
If is greater than or equal to>
Figure SMS_4
＞m/>
Figure SMS_5
Then step 10 is entered, n is an integer greater than or equal to 1.
Further, in step 7, the method further includes: according to
Figure SMS_6
And/or>
Figure SMS_7
The health degree of the compressor is evaluated according to the ratio, and corresponding risk early warning prompt is carried out according to the corresponding ratio.
The invention detects and judges the power frequency and the voltage before the compressor is started, the compressor can be started according with the condition, when the compressor is started, because the current and the voltage are equivalent to the condition of locked rotor just after the compressor is powered on, the current and the voltage when the compressor is started are collected to calculate the equivalent impedance when the compressor is locked rotor, the equivalent impedance when the locked rotor is increased is compared with the equivalent impedance in operation, and the equivalent impedance of the compressor in the operation process is also judged abnormally; meanwhile, different modes are adopted to sample the compressor power and the suction density respectively, the front data and the rear data are compared, and the historical operating power data and the current operating power are compared and analyzed, so that the compressor is accurately protected, and the misjudgment risk is greatly reduced.
Drawings
FIG. 1 is a flow chart of a method of compressor protection according to the present invention.
Detailed Description
The invention relates to a compressor protection method, which comprises the following steps:
step 1, detecting the power supply frequency and the power supply voltage of a compressor before the compressor is started;
step 2, judging the power frequency and the power voltage, if the power frequency is greater than a first threshold frequency or the power frequency is less than a second threshold frequency, and the power voltage is greater than a first threshold voltage or the power voltage is less than a second threshold voltage, prohibiting the compressor from starting, otherwise, entering step 3, wherein the first threshold frequency is greater than the second threshold frequency, and the first threshold voltage is greater than the second threshold voltage;
step 3, detecting and judging the temperature of the shell of the compressor, if the temperature of the shell of the compressor is greater than the first threshold value, forbidding the start of the compressor, and otherwise, entering the step 4;
step 4, starting the compressor;
step 5, collecting the current and voltage when the compressor is started, and calculating the equivalent impedance when the compressor is locked;
step 6, acquiring voltage, current and compressor shell temperature in the normal operation process of the compressor in real time after the compressor is started;
step 7, calculating the equivalent impedance of the compressor during operation according to the voltage and the current acquired in real time in the normal operation process of the compressor;
step 8, monitoring the equivalent impedance in real time during running, and entering step 10 if the equivalent impedance in running is reduced at a rate greater than a threshold value and the difference value between the equivalent impedance in running and the equivalent impedance in locked rotor is smaller than a threshold value difference value, or entering step 9;
step 9, monitoring the shell temperature of the compressor in real time during operation, and entering step 10 if the shell temperature of the compressor is higher than a second threshold shell temperature which is not lower than the first threshold shell temperature;
and step 10, cutting off a corresponding switch of the compressor, and carrying out corresponding fault prompt.
The compressor protection method further includes: and 11, setting corresponding reset time according to different fault types, and entering the step 1 after the corresponding reset time.
In step 6, after the compressor is started, the method further comprises the following steps:
collecting the running current and voltage of the compressor in a set time period, calculating the first running power P1 of the compressor according to the running current and voltage, simultaneously collecting the first evaporation temperature and the first return air temperature of the compressor, and determining the first suction density R1 of the compressor according to the first evaporation temperature, the first return air temperature and a refrigerant state equation;
collecting the running current and voltage of the compressor at a set time point, calculating second running power P2 of the compressor according to the running current and voltage, simultaneously collecting a second evaporation temperature and a second return air temperature of the compressor, and determining a second suction air density R2 of the compressor according to the second evaporation temperature, the second return air temperature and a refrigerant state equation;
comparing the first operating power P1 and the first air suction density R1 in the set time with the second operating power P2 and the second air suction density R2 at the set time, if P2/R2 is more than m (P1/R1), entering step 10, wherein m is more than 0, and m can be adjusted according to the actual situation.
In step 7, the method further comprises:
calculating the running power P of the compressor according to the voltage and current acquired in real time in the normal running process of the compressor, recording the values of all the running power P in the previous n times of running, and calculating the reference power of the previous n times of running of the compressor by a weighted average method
Figure SMS_8
The reference power is compared when the compressor is operated n +1 times>
Figure SMS_9
And the current real-time power->
Figure SMS_10
In the size, if>
Figure SMS_11
＞m/>
Figure SMS_12
Then, go to step 10, n is an integer greater than or equal to 1.
In step 7, the method further comprises: according to
Figure SMS_13
And/or>
Figure SMS_14
The health degree of the compressor is evaluated according to the ratio, and corresponding risk early warning prompt is carried out according to the corresponding ratio.
FIG. 1 is a flow chart of an embodiment of the compressor protection method of the present invention, comprising:
step 101, detecting and judging the power frequency and the power voltage of a compressor before the compressor is started; the judgment standard is as follows: if the power frequency is greater than the first threshold frequency or less than the second threshold frequency, and the power voltage is greater than the first threshold voltage or less than the second threshold voltage, prohibiting the compressor from starting, otherwise, entering step 102; for example, if the power supply voltage is higher than 264V or lower than 90V, and the frequency is abnormal compared with the power supply frequency, the starting is forbidden;
step 102, detecting and judging the temperature of a shell of the compressor; the judgment standard is as follows: if the shell temperature of the compressor is greater than the first threshold shell temperature, the compressor is prohibited from being started, otherwise, the condition is met, and the step 103 is executed; for example, if the temperature of the shell is higher than 50 ℃, the abnormal type is marked as that the temperature of the shell is too high, and starting is forbidden;
103, starting a compressor, collecting current and voltage when the compressor is started, and calculating equivalent impedance when the compressor is locked;
step 104, acquiring voltage, current and compressor shell temperature in the normal operation process of the compressor in real time after the compressor is started;
105, calculating the equivalent impedance of the compressor during operation according to the voltage and the current acquired in real time in the normal operation process of the compressor;
step 106, monitoring the equivalent impedance in real time during operation, and continuously detecting the temperature of the shell if the equivalent impedance meets the conditions; when monitoring, if the equivalent impedance in operation is reduced at a rate larger than a threshold value and the difference value between the equivalent impedance in operation and the equivalent impedance in locked-rotor state is smaller than a threshold value difference value, switching off a corresponding switch of the compressor; and when the temperature of the shell is continuously detected to exceed the set value, the corresponding switch of the compressor is switched off.
In conclusion, the invention realizes the precise protection of the compressor and greatly reduces the risk of misjudgment.

Claims (5)

1. A method of protecting a compressor, comprising:
step 1, detecting the power frequency and the power voltage of a compressor before the compressor is started;
step 2, judging the power frequency and the power voltage, if the power frequency is greater than a first threshold frequency or the power frequency is less than a second threshold frequency, and the power voltage is greater than a first threshold voltage or the power voltage is less than a second threshold voltage, prohibiting the compressor from starting, otherwise, entering step 3, wherein the first threshold frequency is greater than the second threshold frequency, and the first threshold voltage is greater than the second threshold voltage;
step 3, detecting and judging the temperature of the shell of the compressor, if the temperature of the shell of the compressor is greater than the first threshold value, forbidding the start of the compressor, and otherwise, entering the step 4;
step 4, starting the compressor;
step 5, collecting the current and voltage when the compressor is started, and calculating the equivalent impedance when the compressor is locked;
step 6, acquiring voltage, current and the temperature of a shell of the compressor in the normal operation process of the compressor in real time after the compressor is started;
step 7, calculating the equivalent impedance of the compressor during operation according to the voltage and current acquired in real time during the normal operation of the compressor;
step 8, monitoring the equivalent impedance in real time during running, and entering step 10 if the equivalent impedance in running is reduced at a rate greater than a threshold value and the difference value between the equivalent impedance in running and the equivalent impedance in locked rotor is smaller than a threshold value difference value, or entering step 9;
step 9, monitoring the temperature of the shell of the compressor in real time during operation, and entering step 10 if the temperature of the shell of the compressor is higher than a second threshold shell temperature which is not lower than the first threshold shell temperature;
and step 10, cutting off a corresponding switch of the compressor, and carrying out corresponding fault prompt.
2. The compressor protection method of claim 1, further comprising: and 11, setting corresponding reset time according to different fault types, and entering the step 1 after the corresponding reset time.
3. The method for protecting a compressor according to claim 2, wherein the step 6 further comprises, after the compressor is started:
collecting the running current and voltage of the compressor in a set time period, calculating the first running power P1 of the compressor according to the running current and voltage, simultaneously collecting the first evaporation temperature and the first return air temperature of the compressor, and determining the first air absorption density R1 of the compressor according to the first evaporation temperature, the first return air temperature and a refrigerant state equation;
collecting the running current and voltage of the compressor at a set time point, calculating second running power P2 of the compressor according to the running current and voltage, simultaneously collecting a second evaporation temperature and a second return air temperature of the compressor, and determining a second suction air density R2 of the compressor according to the second evaporation temperature, the second return air temperature and a refrigerant state equation;
comparing the first operation power P1 and the first air suction density R1 in the set time with the second operation power P2 and the second air suction density R2 at the set time, if P2/R2 is more than m (P1/R1), entering step 10, and m is more than 0.
4. The method for protecting a compressor according to claim 3, wherein the step 7 further comprises:
calculating the running power P of the compressor according to the voltage and current acquired in real time in the normal running process of the compressor, recording the values of all the running power P in the previous n times of running, calculating the reference power P ' of the previous n times of running of the compressor by a weighted average method, comparing the reference power P ' with the current real-time power P ' when the compressor runs for the (n + 1) th time, and entering the step 10 if P ' > mp ', wherein n is an integer greater than or equal to 1.
5. The compressor protection method according to claim 4, wherein in step 7, further comprising: and evaluating the health degree of the compressor according to the ratio of p 'to p' and carrying out corresponding risk early warning prompt according to the corresponding ratio.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5570257A (en) * 1994-01-03 1996-10-29 Texas Instruments Incorporated Phase sequence wiring protection apparatus
CN110489884B (en) * 2017-05-11 2020-12-25 珠海格力电器股份有限公司 Air conditioner compressor simulation method and system
CN110173421A (en) * 2019-04-22 2019-08-27 广东美博制冷设备有限公司 A kind of method and device for overload protection of compressor
CN112165279A (en) * 2020-09-23 2021-01-01 长虹华意压缩机股份有限公司 Control system and method for constant-frequency compressor of refrigeration appliance
CN112228327A (en) * 2020-10-12 2021-01-15 长虹华意压缩机股份有限公司 Intelligent control system and method for electronic starting controller

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