CN111828302A - Locked rotor control and monitoring system and method for compressor locked rotor performance test bench - Google Patents

Locked rotor control and monitoring system and method for compressor locked rotor performance test bench Download PDF

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Publication number
CN111828302A
CN111828302A CN202010610777.5A CN202010610777A CN111828302A CN 111828302 A CN111828302 A CN 111828302A CN 202010610777 A CN202010610777 A CN 202010610777A CN 111828302 A CN111828302 A CN 111828302A
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compressor
locked rotor
test
data processing
current
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Inventor
郭春阳
李林
张秀妹
肖成军
钟小华
周金伟
王卫华
冯甜甜
黄玲
曾令超
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Guangdong Baiyun University
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Guangdong Baiyun University
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Priority to CN202010610777.5A priority Critical patent/CN111828302A/en
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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
    • F04B51/00—Testing machines, pumps, or pumping installations
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

The invention discloses a system and a method for controlling and monitoring locked rotor of a compressor locked rotor performance test bench, which comprises a data processing module, the data processing module is connected with the data recording module in parallel, the data processing module is connected with the display module in series through the communication module, the data processing module is connected with a control module in parallel, the control module is connected with components in series, the components are connected with an overcurrent alarm and a low-voltage alarm in parallel, the overcurrent alarm and the low-voltage alarm are connected with a feedback circuit in parallel, the other end of the feedback circuit is connected with the data processing module in series, the device can accurately judge the compressor stalling in the compressor stalling performance test bed, manually recovers a protector, finishes the test and records data, realizes the automatic operation of the stalling performance test bed, improves the detection efficiency and avoids the test failure caused by misjudgment.

Description

Locked rotor control and monitoring system and method for compressor locked rotor performance test bench
Technical Field
The invention relates to the technical field of compressors, in particular to a system and a method for controlling and monitoring locked rotor of a compressor locked rotor performance test bench.
Background
In industrial production, low-temperature environments are realized by a refrigeration system, a compressor is the core of the refrigeration cycle system, and once the compressor fails, the damage to the refrigeration system can be caused, and leaked refrigerants can cause environmental pollution. Before the compressor is put into use, performance tests such as locked rotor, durability, refrigerating capacity and the like need to be carried out on the compressor according to national standards, the locked rotor test means that when the compressor is electrified and normally operates, the rotor is locked under the influence of external factors to cause that the rotating speed is suddenly zero, the rotor is locked to enable the current of the compressor to rise instantly, and the current at the moment is the locked rotor current.
The compressor is provided with a built-in overload protector which can reset automatically and has double protection functions of overcurrent and overtemperature. Because the ammeter configured in the locked-rotor test bed is connected in series in the main loop to monitor the loop current value in real time, the phenomenon that the ammeter detects asynchronous current occurs in the test process, three ammeters have slight deviation in detection time, the time for the two ammeters to read the current is about 0.2S time interval, the deviation does not affect the detection result, but the scanning time of the alarm judgment module is less than 0.2S, the judgment of overcurrent protection is immediately made when the rise value of one ammeter is detected, and the alarm judgment module already makes a shutdown instruction after the data of the other ammeter is read. The invention provides a locked rotor control system, a detection method and a monitoring system of a locked rotor performance test bed of a compressor, which can cause test failure due to misjudgment of locked rotor conditions of the compressor and avoid the situation that the test failure is caused by misjudgment of locked rotor generated in the test process.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a system and a method for controlling and monitoring locked rotor of a compressor locked rotor performance test bench.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a compressor lock-rotor performance testboard lock-rotor control, monitoring system and method, includes data processing module, data processing module parallel connection has the data record module, data processing module has the display module through communication module serial connection, data processing module parallel connection has control module, control module serial connection has components and parts, components and parts parallel connection has overcurrent alarm and low-voltage alarm, overcurrent alarm and low-voltage alarm parallel connection have feedback circuit, feedback circuit's the other end serial connection is in data processing module.
Preferably, the components and parts include a counter, a timer, an alarm module, a protector, a three-phase compressor and a single-phase compressor.
Preferably, one end of the counter, the timer, the alarm module, the protector, the three-phase compressor and the single-phase compressor is connected to the controller in parallel, and the other end of the counter, the timer, the alarm module, the protector, the three-phase compressor and the single-phase compressor is connected to the overcurrent alarm and the low-voltage alarm in parallel.
Preferably, the parameter display of the display module includes total test time, total test times, protector action time, power type selection, test type selection, and test start selection.
Preferably, the data processing module receives a voltmeter monitoring voltage value, an ammeter monitoring current value, a compressor pressure value and a compressor temperature value, and the data processing module performs operation in the module to judge whether the compressor normally operates or has a locked rotor phenomenon, converts the judging section number value into a binary signal and sends the binary signal to the control module.
Preferably, the control module comprises a driving alarm module after receiving the alarm signal, a protector is started, and the single-phase compressor or the three-phase compressor is started to operate under the condition that all preset parameters meet the test conditions after the protector receives no alarm signal.
Preferably, the alarm module comprises a digital display ammeter and a digital display voltmeter, the ammeter is arranged in a main loop of the locked rotor test board, the current and the voltage of the whole loop are monitored, and the data are input into the data processing module in real time for processing.
Preferably, the method for blocking the compressor blocking performance test bench comprises the following steps:
s1, before the test is started, parameter setting is carried out according to national standards, the current of a main loop is smaller than a set current threshold limit in the locked rotor test process, the loop voltage is larger than a set voltage threshold lower limit, and the protector does not act and protect when the compressor runs normally;
s2, when the loop current instantly rises to be larger than the upper limit of the set current threshold at a certain moment, the situation that the compressor is locked or the current value instantly rises due to the jitter phenomenon in the loop cannot be judged, and the data processing module processes the numerical value fed back by the ammeter;
s3, the test system can automatically read, recover and recover quickly due to the instantaneous rise of current caused by jitter caused by external interference, the speed of a feedback signal of an ammeter is asynchronous with the speed of the operation of the data processing module, the data processing module immediately judges the locked rotor of the compressor after receiving the instantaneous rise of the current, at the moment, the protector does not act, but the compressor is disconnected with the control module of the main loop, and the compressor stops running;
s4, increasing a judgment condition of the locked rotor of the compressor when the current is larger than the set current threshold, comparing two values of U, V, W three currents with a preset current threshold, wherein the comparison process is carried out in a data processing unit, and when the two values are both larger than the preset high current threshold and the duration is 0.8S, judging that the locked rotor of the compressor occurs;
s5, further judging locked rotor, when the current of the compressor is increased, according to the ohm theorem P ═ UI, the loop voltage should be decreased, a low voltage threshold value is preset, and when the phase voltage corresponding to the increase of the two-phase current value is decreased, the locked rotor of the compressor is judged, the locked rotor of the compressor can be judged by the data processing unit only by meeting one condition;
s6, entering a compressor locked-rotor recovery stage, and sending an instruction to trip a compressor protector after the data processing unit judges the locked rotor of the compressor, wherein the current flowing through the compressor is zero, the voltage flowing through the compressor is zero, and the stop running speed of the compressor is zero;
s7, timing by the timing unit after the protector is tripped, wherein the recovery time is T1 during design, the preset recovery time threshold is T2, the T1 and the T2 are compared in the data processing unit, when the T1 is less than T2, the protector can recover automatically under the condition of no artificial interference, the locked rotor test can recover successfully, and the test is continued; when T1> T2, the protector can not recover by itself, the locked rotor test fails to recover, the test is terminated, and the compressor test needs to be manually recovered by manual recheck, so that the control and monitoring can be completed.
Preferably, the method for monitoring the parding locked rotor in the step S5 includes the following steps:
p1, compressor operating stage: the data processing unit acquires real-time data of a durability test and a phase failure test, wherein the real-time data comprises a loop current value, a loop voltage value, a compressor shell temperature value and a compressor pressure value P2, and when the compressor stalling performance test process is carried out, the measured data of three ammeters connected in series in the loop is AU、AV、AWWith a predetermined current threshold value of AMAX。
Taking two values of the three current values and presetting a current upper limit threshold value AMAXComparing, wherein the comparison process is carried out in the data processing unit, and when the two current values are both larger than a preset current upper limit threshold AMAXAnd the time duration is 0.8S, the occurrence of locked rotor of the compressor can be preliminarily judged.
P3, let AU>AMIs heldDuration of t1,AV>AMHas a duration of t2I.e. { t1&t2}>0.8s；
Let Aw>AMHas a duration of t3,AV>AMHas a duration of t2{ i.e. t2&t3}>0.8s；
Let AU>AMHas a duration of t1,Aw>AMHas a duration of t3{ i.e. t1&t3}>0.8s；
P4, the above three conditions for judging the compressor locked rotor only need to satisfy one of the conditions, and the data processing unit can judge the compressor locked rotor.
The system and the method for controlling and monitoring the locked rotor of the compressor locked rotor performance test board can accurately judge the locked rotor of the compressor in the compressor locked rotor performance test board, manually restore a protector, finish a test and record data, realize the automatic operation of the locked rotor performance test board, improve the detection efficiency and avoid the test failure caused by misjudgment.
Drawings
FIG. 1 is a diagram of a control system of a locked rotor performance test bench of a compressor according to the present invention;
FIG. 2 is a flow chart of the locked rotor detection method of the compressor locked rotor performance test bench of the present invention;
fig. 3 is a test type selection chart of the compressor stalling performance test bench of the invention.
In the figure: the system comprises a data processing module 1, a data recording module 11, a communication device 12, a display module 13, a control module 14, a component 15, a low-voltage alarm 16, an overcurrent alarm 17, a counter 2, a timer 21, an alarm module 22, a protector 23, a three-phase compressor 24 and a single-phase compressor 25.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The utility model provides a compressor stalling performance testboard stalling control, monitoring system and method, includes data processing module 1, 1 parallel connection of data processing module has data record module 11, data processing module 1 has display module 13 through communication module 12 serial connection, 1 parallel connection of data processing module has control module 14, 14 serial connection of control module has components and parts 15, 15 parallel connection of components and parts have overcurrent alarm 17 and low-voltage alarm 16, overcurrent alarm 17 and low-voltage alarm 16 parallel connection have feedback circuit 18, feedback circuit 18's the other end serial connection in data processing module 1.
Preferably, the components 15 include a counter 2, a timer 21, an alarm module 22, a protector 23, a three-phase compressor 24 and a single-phase compressor 25.
Preferably, one end of the counter 2, the timer 21, the alarm module 22, the protector 23, the three-phase compressor 24 and the single-phase compressor 25 is connected in parallel to the controller 14, and the other end is connected in parallel to the overcurrent alarm 17 and the low-voltage alarm 16.
Preferably, the parameter display of the display module 13 includes total test time, total test times, protector action time, power type selection, test type selection, and test start selection.
Preferably, the data processing module 11 receives a voltmeter monitoring voltage value, an ammeter monitoring current value, a compressor pressure value and a compressor temperature value, performs operation in the module to judge whether the compressor normally operates or a locked rotor phenomenon occurs, and converts the judging section number value into a binary signal to be sent to the control module.
Preferably, the control module 14 includes a driving alarm module for receiving the alarm signal, and starting the protector, and when the alarm signal is not received, the single-phase compressor or the three-phase compressor is started to operate under the condition that all preset parameters meet the test conditions.
Preferably, the alarm module 22 includes a digital display ammeter and a digital display voltmeter, the ammeter is installed in the main loop of the locked rotor test desk, monitors the current and voltage of the whole loop, and inputs the data into the data processing module for processing in real time.
Preferably, the method for blocking the compressor blocking performance test bench comprises the following steps:
s1, before the test is started, parameter setting is carried out according to national standards, the current of a main loop is smaller than a set current threshold limit in the locked rotor test process, the loop voltage is larger than a set voltage threshold lower limit, and the protector does not act and protect when the compressor runs normally;
s2, when the loop current instantly rises to be larger than the upper limit of the set current threshold at a certain moment, the situation that the compressor is locked or the current value instantly rises due to the jitter phenomenon in the loop cannot be judged, and the data processing module processes the numerical value fed back by the ammeter;
s3, the test system can automatically read, recover and recover quickly due to the instantaneous rise of current caused by jitter caused by external interference, the speed of a feedback signal of an ammeter is asynchronous with the speed of the operation of the data processing module, the data processing module immediately judges the locked rotor of the compressor after receiving the instantaneous rise of the current, at the moment, the protector does not act, but the compressor is disconnected with the control module of the main loop, and the compressor stops running;
s4, increasing a judgment condition of the locked rotor of the compressor when the current is larger than the set current threshold, comparing two values of U, V, W three currents with a preset current threshold, wherein the comparison process is carried out in a data processing unit, and when the two values are both larger than the preset high current threshold and the duration is 0.8S, judging that the locked rotor of the compressor occurs;
s5, further judging locked rotor, when the current of the compressor is increased, according to the ohm theorem P ═ UI, the loop voltage should be decreased, a low voltage threshold value is preset, and when the phase voltage corresponding to the increase of the two-phase current value is decreased, the locked rotor of the compressor is judged, the locked rotor of the compressor can be judged by the data processing unit only by meeting one condition;
s6, entering a compressor locked-rotor recovery stage, and sending an instruction to trip a compressor protector after the data processing unit judges the locked rotor of the compressor, wherein the current flowing through the compressor is zero, the voltage flowing through the compressor is zero, and the stop running speed of the compressor is zero;
s7, timing by the timing unit after the protector is tripped, wherein the recovery time is T1 during design, the preset recovery time threshold is T2, the T1 and the T2 are compared in the data processing unit, when the T1 is less than T2, the protector can recover automatically under the condition of no artificial interference, the locked rotor test can recover successfully, and the test is continued; when T1> T2, the protector can not recover by itself, the locked rotor test fails to recover, the test is terminated, and the compressor test needs to be manually recovered by manual recheck, so that the control and monitoring can be completed.
Preferably, the method for monitoring the parding locked rotor in the step S5 includes the following steps:
p1, compressor operating stage: the data processing unit acquires real-time data of a durability test and a phase failure test, wherein the real-time data comprises a loop current value, a loop voltage value, a compressor shell temperature value and a compressor pressure value P2, and when the compressor stalling performance test process is carried out, the measured data of three ammeters connected in series in the loop is AU、AV、AWWith a predetermined current threshold value of AMAX。
Taking two values of the three current values and presetting a current upper limit threshold value AMAXComparing, wherein the comparison process is carried out in the data processing unit, and when the two current values are both larger than a preset current upper limit threshold AMAXAnd the time duration is 0.8S, the occurrence of locked rotor of the compressor can be preliminarily judged.
P3, let AU>AMHas a duration of t1,AV>AMHas a duration of t2I.e. { t1&t2}>0.8s；
Let Aw>AMHas a duration of t3,AV>AMHas a duration of t2{ i.e. t2&t3}>0.8s；
Let AU>AMHas a duration of t1,Aw>AMHas a duration of t3{ i.e. t1&t3}>0.8s；
P4, the above three conditions for judging the compressor locked rotor only need to satisfy one of the conditions, and the data processing unit can judge the compressor locked rotor.
The system and the method for controlling and monitoring the locked rotor of the compressor locked rotor performance test board can accurately judge the locked rotor of the compressor in the compressor locked rotor performance test board, manually restore a protector, finish a test and record data, realize the automatic operation of the locked rotor performance test board, improve the detection efficiency and avoid the test failure caused by misjudgment.
Examples
FIG. 1 is a control system diagram of a compressor stalling performance test bed, when detecting the stalling performance of a compressor according to requirements, a display module is required to perform a preset value on test parameters,
selecting a power supply according to the model of the tested compressor: AC380V or AC220V voltages,
selecting the test type: a durability test or a phase loss test,
selecting the type of the phase-loss test: lack of U phase, lack of V phase, lack of W phase.
Setting total test time, total test times and protector protection time.
After the parameters are set, all the parameters are read by the data processing module and then processed, the data are processed into a secondary system signal and then input into the control module, and the control module is connected with the compressor protector, the alarm module, the timer, the counter and the compressor.
When the compressor stalling test is carried out the in-process according to the default parameter, if meet the low voltage warning, the overcurrent warning, alarm signal feedback to data processing module, data processing module judges the compressor stalling, with signal transmission to control module start-up warning, trigger bee calling organ and alarm lamp this moment, and send out the instruction and stop the compressor operation instruction, the protector makes the protection action, protector time beginning timing this moment, carry out the recovery of compressor stalling according to timing result and presetting protector guard time and comparing.
Fig. 2 shows a locked rotor detection method for a compressor locked rotor performance test bed, in [0047], after a compressor locked rotor test is started, a data processing module obtains data of a test system in real time, wherein the data includes a loop current value, a loop voltage value, a compressor pressure value, a compressor power value, a compressor temperature value, a test operation time, a test operation frequency, a protector protection time, and a protector stop time.
During the test, the compressor is in a normal running state, and the ammeter shows that the current is AU,AV,AWAre all less than the current threshold AMAX,When the current monitored by the ammeter is increased instantly, the judging module in the data processing module starts to operate.
AU,AV,AWTwo of the three current values are increased instantly, the judging module sends an instruction to start timing, and the timing is carried out until the two current values are increased and the duration is more than 0.8S.
At the moment, according to the fact that the input power of the compressor is unchanged when the power P is equal to UI, the current at two ends of the compressor is increased, the corresponding voltage should be reduced, the line voltage increased in 0.8S is smaller than the lower limit of the set voltage threshold, namely the current is continuously increased in 0.8S to be larger than the current threshold, and the voltage is continuously reduced to be smaller than the voltage threshold.
The system fault caused by the locked-rotor of the compressor is judged instead of the current rise caused by the system fault caused by the jitter of a test system or the burning of components, so that the condition of misjudgment is avoided.
When the judging module judges that the compressor is locked, an instruction is sent to the control module to stop the compressor from running, and meanwhile, an instruction is sent to enable the protector to act, and the protector acts and starts timing.
When the protection time T of the protector is less than the preset protector action time, the locked rotor of the compressor is successfully recovered, the test is continued, when the protection time T of the protector is greater than the preset protector action time, the locked rotor of the compressor is failed to recover, the test is stopped, and the locked rotor reason of the compressor needs to be manually retested.
FIG. three is a flow chart of selection and test of a compressor stalling performance test bench
Firstly, the external power supply is switched on, the AC380V three-phase power supply or the AC220C single-phase power supply is selected according to the tested compressor type,
selecting the test type: durability test
The durability test is divided into two types
The compressor can be operated in a specified time to perform a locked-rotor self-recovery test, and the total operation time is used as a condition for judging the end of the test.
The compressor can perform a locked-rotor self-recovery test within a predetermined number of times of the protector, and the number of times of protector operation is used as a condition for judging the end of the test.
In the durability test, the total running time T3, the protector operating time T4,
at this time AU.AV.AW<AMAXn、Uu-v.UU-W.UV-W>UminAnd starting a test on the locked rotor performance test bed. When the test run time is greater than T1, the test ends.
In the durability test, the total number of times of protector operation C1 and the protector operation time T2 are set, at this time AU.AV.AW<AMAXn、Uu-v.UU-W.UV-W>UminAnd (4) starting a test by the locked rotor performance test bed, and finishing the test when the total test running times are more than C1.
Selecting an experiment type; open phase test
The phase loss test is divided into three types:
u-phase lacking test: the U phase of the three-phase compressor is cut off from the main circuit, the locked-rotor self-recovery test can be performed when the three-phase compressor is operated within a predetermined time, and the total operation time is used as a condition for judging the end of the test.
Phase V deficiency test: the V phase of the three-phase compressor is cut off from the main circuit, and the locked-rotor self-recovery test can be performed by operating the three-phase compressor for a predetermined time.
Phase-lacking test: the W phase of the three-phase compressor is cut off from the main circuit, the locked-rotor self-recovery test can be performed when the compressor is operated within a predetermined time, and the total operation time is used as a condition for judging the end of the test.
The open-phase test is carried out by setting total running time T5 and protector action time T6,
at this time AU.AV.AW<AMAXn、Uu-v.UU-W.UV-W>UminAnd starting a test on the locked rotor performance test bed. When the test run time is greater than T5, the test ends.
The action times of the protector within the set time are recorded, the protection capability of the protector is tested, and the compressor is prevented from being burnt out due to rotation blockage.

Claims (9)

1. The utility model provides a compressor stalling performance testboard stalling control, monitoring system and method, includes data processing module (1), its characterized in that: data processing module (1) parallel connection has data record module (11), data processing module (1) has display module (13) through communication module (12) serial connection, data processing module (1) parallel connection has control module (14), control module (14) serial connection has components and parts (15), components and parts (15) parallel connection has overcurrent alarm (17) and low voltage alarm (16), overcurrent alarm (17) and low voltage alarm (16) parallel connection have feedback circuit (18), the other end serial connection of feedback circuit (18) is in data processing module (1).
2. The system and the method for controlling and monitoring the locked rotor of the compressor locked rotor performance test bench according to claim 1 are characterized in that: the components (15) comprise a counter (2), a timer (21), an alarm module (22), a protector (23), a three-phase compressor (24) and a single-phase compressor (25).
3. The system and the method for controlling and monitoring the locked rotor of the compressor locked rotor performance test bench according to the claim 2 are characterized in that: one end of the counter (2), one end of the timer (21), one end of the alarm module (22), one end of the protector (23), one end of the three-phase compressor (24) and one end of the single-phase compressor (25) are connected to the controller (14) in parallel, and the other end of the three-phase compressor is connected to the overcurrent alarm (17) and the low-voltage alarm (16) in parallel.
4. The system and the method for controlling and monitoring the locked rotor of the compressor locked rotor performance test bench according to the claim 1 are characterized in that: the parameter display of the display module (13) comprises total test time, total test times, protector action time, power supply type selection, test type selection and test start selection.
5. The system and the method for controlling and monitoring the locked rotor of the compressor locked rotor performance test bench according to the claim 1 are characterized in that: the data processing module (11) receives a voltmeter monitoring voltage value, an ammeter monitoring current value, a compressor pressure value and a compressor temperature value, operates in the module to judge whether the compressor normally operates or a locked rotor phenomenon occurs, and converts the judging section number value into a binary signal to be sent to the control module.
6. The system and the method for controlling and monitoring the locked rotor of the compressor locked rotor performance test bench according to the claim 1 are characterized in that: the control module (14) comprises a driving alarm module after receiving the alarm signal, a protector is started, and the single-phase compressor or the three-phase compressor is started to operate under the condition that all preset parameters meet the test conditions after the protector receives no alarm signal.
7. The system and the method for controlling and monitoring the locked rotor of the compressor locked rotor performance test bench according to the claim 2 are characterized in that: the alarm module (22) comprises a digital display ammeter and a digital display voltmeter, the ammeter is arranged in a main loop of the locked rotor test board, monitors the current and the voltage of the whole loop, and inputs the data into the data processing module in real time for processing.
8. The system and the method for controlling and monitoring the locked rotor of the compressor locked rotor performance test bench according to the claim 1 are characterized in that: the method for stalling the compressor stalling performance test bench comprises the following steps:
s1, before the test is started, parameter setting is carried out according to national standards, the current of a main loop is smaller than a set current threshold limit in the locked rotor test process, the loop voltage is larger than a set voltage threshold lower limit, and the protector does not act and protect when the compressor runs normally;
s2, when the loop current instantly rises to be larger than the upper limit of the set current threshold at a certain moment, the situation that the compressor is locked or the current value instantly rises due to the jitter phenomenon in the loop cannot be judged, and the data processing module processes the numerical value fed back by the ammeter;
s3, the test system can automatically read, recover and recover quickly due to the instantaneous rise of current caused by jitter caused by external interference, the speed of a feedback signal of an ammeter is asynchronous with the speed of the operation of the data processing module, the data processing module immediately judges the locked rotor of the compressor after receiving the instantaneous rise of the current, at the moment, the protector does not act, but the compressor is disconnected with the control module of the main loop, and the compressor stops running;
s4, increasing a judgment condition of the locked rotor of the compressor when the current is larger than the set current threshold, comparing two values of U, V, W three currents with a preset current threshold, wherein the comparison process is carried out in a data processing unit, and when the two values are both larger than the preset high current threshold and the duration is 0.8S, judging that the locked rotor of the compressor occurs;
s5, further judging locked rotor, when the current of the compressor is increased, according to the ohm theorem P ═ UI, the loop voltage should be decreased, a low voltage threshold value is preset, and when the phase voltage corresponding to the increase of the two-phase current value is decreased, the locked rotor of the compressor is judged, the locked rotor of the compressor can be judged by the data processing unit only by meeting one condition;
s6, entering a compressor locked-rotor recovery stage, and sending an instruction to trip a compressor protector after the data processing unit judges the locked rotor of the compressor, wherein the current flowing through the compressor is zero, the voltage flowing through the compressor is zero, and the stop running speed of the compressor is zero;
s7, timing by the timing unit after the protector is tripped, wherein the recovery time is T1 during design, the preset recovery time threshold is T2, the T1 and the T2 are compared in the data processing unit, when the T1 is less than T2, the protector can recover automatically under the condition of no artificial interference, the locked rotor test can recover successfully, and the test is continued; when T1> T2, the protector can not recover by itself, the locked rotor test fails to recover, the test is terminated, and the compressor test needs to be manually recovered by manual recheck, so that the control and monitoring can be completed.
9. The system and the method for controlling and monitoring the locked rotor of the compressor locked rotor performance test bench according to the claim 1 are characterized in that: the method for monitoring the handkerchief-butyl locked rotor in the step S5 comprises the following steps:
p1, compressor operating stage: the data processing unit acquires real-time data of a durability test and a phase failure test, and the real-time data comprises a loop current value, a loop voltage value, a compressor shell temperature value and a compressor pressure value
P2, during the test of the locked rotor performance of the compressor, the measured data of three ammeters connected in series to the loop is AU、AV、AWWith a predetermined current threshold value of AMAX。
Taking two values of the three current values and presetting a current upper limit threshold value AMAXComparing, wherein the comparison process is carried out in the data processing unit, and when the two current values are both larger than a preset current upper limit threshold AMAXAnd the time duration is 0.8S, the occurrence of locked rotor of the compressor can be preliminarily judged.
P3, let AU>AMHas a duration of t1,AV>AMHas a duration of t2I.e. { t1&t2}>0.8s；
Let Aw>AMHas a duration of t3,AV>AMHas a duration of t2{ i.e. t2&t3}>0.8s；
Let AU>AMHas a duration of t1,Aw>AMHas a duration of t3{ i.e. t1&t3}>0.8s；
P4, the above three conditions for judging the compressor locked rotor only need to satisfy one of the conditions, and the data processing unit can judge the compressor locked rotor.
CN202010610777.5A 2020-06-29 2020-06-29 Locked rotor control and monitoring system and method for compressor locked rotor performance test bench Pending CN111828302A (en)

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