CN110726487A - Method for calibrating calculated temperature of direct-current variable-frequency compressor winding - Google Patents
Method for calibrating calculated temperature of direct-current variable-frequency compressor winding Download PDFInfo
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- CN110726487A CN110726487A CN201911011558.9A CN201911011558A CN110726487A CN 110726487 A CN110726487 A CN 110726487A CN 201911011558 A CN201911011558 A CN 201911011558A CN 110726487 A CN110726487 A CN 110726487A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/005—Calibration
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Abstract
The invention relates to a calibration technology for calculating the temperature of a winding of a direct-current variable-frequency compressor, and discloses a method for calibrating the calculated temperature of the winding of the direct-current variable-frequency compressor, which solves the problem of overlarge deviation between the calculated temperature of the winding and the actual temperature of the winding caused by individual parameter deviation of the direct-current variable-frequency compressor, and obtains a calculated value of the winding temperature which is closer to the real condition. The method adopts the temperature difference value obtained by directly measuring the winding temperature and the exhaust temperature of the compressor of the air conditioner outdoor unit under the standard detection environment as the calibration temperature difference, under the same environment and the same operation condition, the winding temperature of the compressor is obtained by calculation when the outdoor units in the same batch run, the temperature difference obtained by measuring the obtained exhaust temperature is compared with the calibration temperature difference, so that the deviation value of each outdoor unit is obtained as the winding temperature correction value, and in the using process of the outdoor unit, the calculated winding temperature is corrected by using the winding temperature correction value, so that the winding temperature closer to the real condition can be obtained.
Description
Technical Field
The invention relates to a calibration technology for calculating temperature of a winding of a direct-current variable-frequency compressor, in particular to a method for calibrating the calculated temperature of the winding of the direct-current variable-frequency compressor.
Background
The accurate understanding of the winding temperature of the direct-current variable-frequency compressor has important significance for the self-checking and the control of the outdoor unit of the air conditioner, but due to the limitation of the internal working environment of the direct-current variable-frequency compressor, a temperature sensor is not arranged in the conventional direct-current variable-frequency compressor, and therefore the winding temperature of the compressor cannot be obtained through direct measurement.
In the prior art, some manufacturers propose to estimate the temperature of the compressor winding by the variation of some temperature-related characteristic parameter inside the compressor. One method for detecting the winding temperature of a motor and a device including the motor, as proposed in patent CN201610808947.4 of the present company, is to calculate the current winding temperature by estimating the winding temperature change according to the relationship between the resistance/flux change rate of the motor winding and the temperature change.
In the winding calculation scheme, for determining the resistance/magnetic flux change rate, the initial resistance/magnetic flux parameter of the winding and the actual resistance/magnetic flux parameter of the winding during the operation of the motor are utilized; the initial resistance/magnetic flux parameters are theoretical nominal values, and in the actual situation, due to the influence factors of manufacturing and materials, the individual parameters of the direct-current variable-frequency compressor cannot be avoided to generate deviation, the theoretical parameters are used for calculating the temperature of a winding of the compressor to inevitably generate certain deviation, the deviation can meet the requirement on only protecting the insulation of the winding, but the refrigerant charge quantity of a system is calibrated with higher precision, so that the larger fluctuation is caused, and the deviation of the calculated temperature of the winding caused by the parameter deviation of the compressor needs to be calibrated before each air conditioner leaves a factory.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for calibrating the calculated temperature of the winding of the direct-current variable-frequency compressor is provided, the problem that the calculated temperature of the winding is too large in deviation with the actual temperature of the winding due to individual parameter deviation of the direct-current variable-frequency compressor is solved, and the calculated value of the winding temperature which is closer to the real condition is obtained.
The scheme adopted by the invention for solving the technical problems is as follows:
a method for calibrating the calculated temperature of a winding of a direct current variable frequency compressor comprises the following steps:
a. determining standard detection environment and running state parameters of an air conditioner external unit;
b. in a standard detection environment, operating the standard air conditioner external unit under the operating state parameters of the air conditioner external unit determined in the step a;
c. detecting the winding temperature of a direct-current variable frequency compressor of a standard air conditioner external unit and the exhaust temperature at the same moment, and calculating the temperature difference delta T0 between the winding temperature and the exhaust temperature;
d. in the mass production process of the air conditioner external units, operating each air conditioner external unit under the operating state parameters of the air conditioner external units determined in the step a in a standard detection environment;
e. respectively calculating the winding temperature of a direct-current variable frequency compressor of each air conditioner external unit, detecting the exhaust temperature at the same moment, and calculating the temperature difference delta Tn between the winding temperature and the exhaust temperature;
f. respectively calculating the difference value delta n between delta Tn calculated in the step e and delta T0 calculated in the step c, and storing the delta n serving as a correction value into a control system of the corresponding air conditioner external unit;
g. in the subsequent use process of the air conditioner external unit, after the winding temperature Trn of the direct current frequency conversion compressor is calculated, the Trn is corrected based on the correction value delta n in the air conditioner external unit, and the final winding temperature Trn' is obtained as Trn-delta n.
As a further optimization, in the step a, the standard detection environment is a temperature environment of a commercial inspection room, and the running state parameters of the air conditioner external unit include a working mode, a running duration, a running frequency and a throttle opening.
The method is characterized in that the standard detection environment and the running state parameters of the air conditioner external unit are determined so as to ensure the consistency of detection of the air conditioner external unit and the standard air conditioner external unit in batch production, and therefore an accurate correction value is obtained.
As a further optimization, in the step b, the standard air conditioner external unit is an air conditioner external unit sampled from mass production air conditioner external units, and a thermocouple for detecting the winding temperature is arranged on a compressor winding of the air conditioner external unit.
Sampling is carried out from the air conditioner outdoor unit in batch production, and the thermocouple is arranged to directly detect the winding temperature, so that the accurate winding temperature can be obtained, and the difference value between the winding temperature and the exhaust temperature can be calibrated conveniently.
As a further optimization, in the step c, the winding temperature is detected by a thermocouple arranged on a compressor winding of the standard air conditioner external unit, and the exhaust temperature at the same moment is detected by a temperature sensor or a special tool carried by the standard air conditioner external unit.
The exhaust temperature is directly detected through a sensor or a tool, so that the accurate exhaust temperature can be obtained conveniently to calibrate the difference value between the winding temperature and the exhaust temperature.
As a further optimization, in step c, the temperature difference Δ T0 between the winding temperature and the exhaust temperature is an average value of the winding temperature and the exhaust temperature of the plurality of standard air conditioner external units.
The average value of the difference values of the winding temperatures of the plurality of standard air conditioner external units and the exhaust temperatures at the same moment is beneficial to improving the calibration precision of the temperature difference values.
The invention has the beneficial effects that:
based on the characteristic that the refrigerant charge of the air conditioner outdoor unit is in the most standard charge state (both the refrigerant charge is 100% and cannot be influenced by different charge amounts) in batch production and the difference between the temperature of the compressor winding and the exhaust temperature is consistent under the same operating environment and operating state, the temperature difference between the winding temperature directly measured by a thermocouple and the exhaust temperature directly measured by a temperature sensor is calibrated, the calibrated temperature difference is used as a reference, and the deviation value between the calculated value of the winding temperature of each air conditioner outdoor unit compressor in the same batch and the temperature difference of the exhaust temperature and the reference is calculated as a correction value, so that the calculated value of the winding temperature of each air conditioner outdoor unit compressor is correspondingly corrected, and the problem that the calculated temperature of the winding is excessively different from the actual winding temperature due to the deviation of individual parameters of the direct-current variable frequency compressor is solved, after correction, a winding temperature calculation value closer to a real situation can be obtained, and the outdoor unit can conveniently perform accurate self-inspection.
Detailed Description
The invention aims to provide a method for calibrating the calculated temperature of a winding of a direct-current variable-frequency compressor, which solves the problem of overlarge deviation between the calculated temperature of the winding and the actual temperature of the winding caused by individual parameter deviation of the direct-current variable-frequency compressor and obtains a calculated value of the temperature of the winding which is closer to the real condition.
For an air conditioning system, under the same charging amount and operation conditions, the temperature difference value between the winding temperature and the exhaust temperature of the compressor when the outdoor units in the same batch run is basically determined, therefore, the invention adopts the temperature difference value obtained by directly measuring the winding temperature and the exhaust temperature of the compressor of the outdoor unit of the air conditioner under the standard detection environment as the calibration temperature difference, under the same environment and under the same operation conditions (the operation time, the operation frequency and the throttle opening degree are all the same), the winding temperature of the compressor is obtained by calculation, the temperature difference obtained by measuring the obtained exhaust temperature is compared with the calibration temperature difference, so as to obtain the deviation value aiming at each outdoor unit, the deviation value is stored in the corresponding outdoor unit control system memory as the winding temperature correction value, and in the using process of the outdoor unit, the calculated winding temperature is corrected by using the winding temperature correction value, a winding temperature closer to the real case can be obtained.
In particular, the method for calibrating the calculated temperature of the winding of the direct-current variable-frequency compressor comprises the following implementation steps of:
1. determining standard detection environment and running state parameters of an air conditioner external unit;
in the process of mass production, each air conditioner outdoor unit enters a commodity inspection room for operation inspection, so that the temperature environment of the commodity inspection room is used as a standard detection environment; the running state parameters of the air conditioner external unit comprise a working mode, running time, running frequency and throttle opening.
Namely, the detection environment and the operation condition are unified, so that the consistency of the detection of the mass-produced air conditioner external unit and the standard air conditioner external unit is ensured, and an accurate correction value is obtained.
2. In a standard detection environment, operating the standard air conditioner external unit under the operating state parameters of the air conditioner external unit determined in the step 1;
the standard air conditioner external unit is an air conditioner external unit sampled from mass production air conditioner external units, has the same model and the same structure as the batch of the air conditioner external units, and is provided with a thermocouple for detecting the winding temperature on a compressor winding of the air conditioner external unit only for the requirement of temperature calibration.
3. Detecting the winding temperature of a direct-current variable frequency compressor of a standard air conditioner external unit and the exhaust temperature at the same moment, and calculating the temperature difference delta T0 between the winding temperature and the exhaust temperature;
in the step, a winding temperature TR0 is detected by a thermocouple arranged on a compressor winding of a standard air conditioner external unit, an exhaust temperature TP0 at the same moment is detected by a temperature sensor or a special tool carried by the standard air conditioner external unit, and a temperature difference delta T0 between the winding temperature and the exhaust temperature is calculated to be TR0-TP 0;
in actual operation, in order to further improve the accuracy of temperature difference calibration, thermocouples can be arranged at the same positions of windings of a plurality of air conditioner outdoor units in a sampling manner to serve as standard air conditioner outdoor units, so that the temperature difference Δ T0 between the winding temperature and the exhaust temperature of the plurality of standard air conditioner outdoor units can be obtained, and the Δ T0 is averaged to obtain the finally calibrated Δ T0.
4. In the mass production process of the air conditioner external units, operating each air conditioner external unit under the operating state parameters of the air conditioner external units determined in the step 1 in a standard detection environment;
in this step, the ambient temperature of the outer machine of air conditioner in the commodity inspection room is the same with the ambient temperature of the outer machine of standard air conditioner in step 2 to the running state is also the same, like: the same working mode, the same running time length, the same running frequency and the same throttle valve opening degree can ensure that the running conditions are consistent, thereby improving the accuracy of measurement.
5. Respectively calculating the winding temperature of a direct-current variable frequency compressor of each air conditioner external unit, detecting the exhaust temperature at the same moment, and calculating the temperature difference delta Tn between the winding temperature and the exhaust temperature;
in this step, a winding temperature TRn is calculated for each air conditioner external unit (a resistance/magnetic flux change rate calculation method in patent CN201610808947.4 may be adopted), and a temperature sensor is used to detect an exhaust temperature TPn at the same time, so as to obtain a temperature difference Δ Tn between the winding temperature and the exhaust temperature which is TRn-TPn; here, n is the number of the air conditioner external units produced in the same batch as the standard air conditioner external units.
6. Respectively calculating a difference value delta n between delta Tn calculated in the step 5 and delta T0 calculated in the step 3, and storing the delta n serving as a correction value into a control system of the corresponding air conditioner external unit;
after the temperature difference Δ Tn between the winding temperature and the discharge temperature of each air conditioner external unit is calculated in step 5, a difference Δ n from the nominal temperature difference Δ T0 may be calculated, where Δ n is Δ Tn- Δ T0;
and then storing the delta n serving as a correction value into a control system corresponding to the air conditioner external unit.
7. In the subsequent use process of the air conditioner external unit, after the winding temperature Trn of the direct current frequency conversion compressor is calculated, the Trn is corrected based on the correction value delta n in the air conditioner external unit, and the final winding temperature Trn' is obtained as Trn-delta n.
In this step, in the subsequent use process of the air conditioner external unit, the calculated winding temperature is corrected based on the stored correction value, for example: the correction value Δ n stored in an air conditioner outdoor unit is 0.5 ℃, the winding temperature is obtained by calculation (the resistance/magnetic flux change rate calculation in patent CN201610808947.4 can be adopted) to be 70 ℃, and the final winding temperature is corrected to be 69.5 ℃.
Claims (5)
1. A method for calibrating the calculated temperature of a winding of a direct current variable frequency compressor is characterized by comprising the following steps:
a. determining standard detection environment and running state parameters of an air conditioner external unit;
b. in a standard detection environment, operating the standard air conditioner external unit under the operating state parameters of the air conditioner external unit determined in the step a;
c. detecting the winding temperature of a direct-current variable frequency compressor of a standard air conditioner external unit and the exhaust temperature at the same moment, and calculating the temperature difference delta T0 between the winding temperature and the exhaust temperature;
d. in the mass production process of the air conditioner external units, operating each air conditioner external unit under the operating state parameters of the air conditioner external units determined in the step a in a standard detection environment;
e. respectively calculating the winding temperature of a direct-current variable frequency compressor of each air conditioner external unit, detecting the exhaust temperature at the same moment, and calculating the temperature difference delta Tn between the winding temperature and the exhaust temperature;
f. respectively calculating the difference value delta n between delta Tn calculated in the step e and delta T0 calculated in the step c, and storing the delta n serving as a correction value into a control system of the corresponding air conditioner external unit;
g. in the subsequent use process of the air conditioner external unit, after the winding temperature Trn of the direct current frequency conversion compressor is calculated, the Trn is corrected based on the correction value delta n in the air conditioner external unit, and the final winding temperature Trn' is obtained as Trn-delta n.
2. The method of calibrating DC inverter compressor winding calculated temperature of claim 1,
in the step a, the standard detection environment is a temperature environment of a commodity inspection room, and the running state parameters of the air conditioner external unit comprise a working mode, running time, running frequency and throttle opening.
3. The method of calibrating DC inverter compressor winding calculated temperature of claim 1,
in the step b, the standard air conditioner external unit is an air conditioner external unit sampled from mass production air conditioner external units, and a thermocouple for detecting the winding temperature is arranged on a compressor winding of the air conditioner external unit.
4. The method of calibrating DC inverter compressor winding calculated temperature of claim 1,
and c, detecting the winding temperature through a thermocouple arranged on a compressor winding of the standard air conditioner external unit, and detecting the exhaust temperature at the same moment through a temperature sensor or a special tool carried by the standard air conditioner external unit.
5. The method of calibrating DC inverter compressor winding calculated temperature of claim 1,
in step c, the temperature difference Δ T0 between the winding temperature and the exhaust temperature is an average value of the winding temperature and the exhaust temperature of the plurality of standard air conditioner external units.
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| CN201911011558.9A CN110726487B (en) | 2019-10-23 | 2019-10-23 | Method for calibrating calculated temperature of direct-current variable-frequency compressor winding |
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| CN111272312A (en) * | 2020-02-21 | 2020-06-12 | 四川长虹空调有限公司 | Method for calibrating installation position of temperature sensor of outdoor unit of air conditioner |
| CN111380626A (en) * | 2020-03-23 | 2020-07-07 | 四川长虹空调有限公司 | Air conditioner compressor winding temperature calculation calibration method |
| CN114593776A (en) * | 2022-04-11 | 2022-06-07 | 四川长虹空调有限公司 | Holographic parameter commodity inspection method and system for outdoor unit of air conditioner |
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