CN109059375B - Self-adaptive current value control method of compressor - Google Patents
Self-adaptive current value control method of compressor Download PDFInfo
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- CN109059375B CN109059375B CN201810851227.5A CN201810851227A CN109059375B CN 109059375 B CN109059375 B CN 109059375B CN 201810851227 A CN201810851227 A CN 201810851227A CN 109059375 B CN109059375 B CN 109059375B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention relates to a self-adaptive current value control method of a compressor, which comprises a current protection control unit, a temperature sensor and a current detection unit, wherein the current protection control unit is used for controlling the current value of a compressor; entering normal operation after compressor start-up: a) the current detection unit detects an initial working current value I1 of the compressor, and the current protection control unit sets the protection current of the compressor to be I1+ M1; b) and when the current protection control unit determines that the working environment temperature value changes, the current detection unit detects the working current value of the compressor once, and when N working current value records are accumulated, the current protection control unit calculates an average value of the N records, wherein the average value is called as an average working current value I2, and the current protection control unit modifies the protection current of the compressor into I2+ M2. The invention can realize the automatic adjustment of the protection current of the compressor according to the change of the working environment temperature, accurately perform overcurrent protection on the compressor and simplify the type of the protector product.
Description
Technical Field
The invention relates to the technical field of compressor protection, in particular to a self-adaptive current value control method of a compressor.
Background
The compressor is an important component of cold chain equipment, the working environment temperature of the compressor has a great influence on the cold chain equipment, the working current of the compressor can also change due to the change of the working environment temperature, in order to protect the compressor, most of the existing methods are to add a protector on the compressor, and the method for controlling the protection current of the compressor by the protector is as follows: setting a protection current for the compressor, and when the working current of the compressor is greater than the protection current, automatically stopping the compressor to avoid burning out; however, the power of the compressors used by the cold chains with different sizes is different, so that a protector is designed for each type of compressor, thereby causing various protector products, increasing the production cost of manufacturers and being not beneficial to the development of the manufacturers. Therefore, it is necessary to design a self-adaptive current value control method for a compressor to solve the problem of various protector products.
Disclosure of Invention
The invention aims to provide a self-adaptive current value control method of a compressor, which can automatically adjust the protection current of the compressor according to the change of the temperature of a working environment, reduce the influence of seasonal changes on the compressor, accurately perform over-current protection on the compressor, simplify the type of a protector product, reduce the design cost of a manufacturer on the protector and facilitate the development of enterprises.
The technical scheme of the invention is realized as follows: the self-adaptive current value control method of the compressor is characterized by comprising a current protection control unit, a temperature sensor and a current detection unit, wherein the temperature sensor and the current detection unit are respectively connected with the current protection control unit, the current protection control unit is connected with the compressor, the temperature sensor is used for detecting the working environment temperature of the compressor, and the current detection unit is used for detecting the working current of the compressor; entering normal operation after compressor start-up:
a) the current detection unit detects an initial working current value I1 of the compressor and transmits the initial working current value I1 to the current protection control unit, and then the current protection control unit sets the protection current of the compressor to be I1+ M1;
b) the temperature sensor constantly monitors the working environment temperature value of the compressor and transmits the detected working environment temperature value to the current protection control unit, the current protection control unit compares the detected working environment temperature value, and once the working environment temperature value changes, the current detection unit detects the working current value of the primary compressor and stores the working current value to the current protection control unit; for each N operating current value records accumulated, the current protection control unit calculates an average value, called the average operating current value I2, for the N records, after which the current protection control unit modifies the protection current of the compressor to I2+ M2.
Further, the M1 is 1.5A-M1-3A.
Still further, the M2 is 1.5A-3A, M2.
Still further, N is more than or equal to 5.
The invention has the beneficial effects that: according to the invention, by adopting the current protection control unit, the temperature sensor and the current detection unit, when the compressor enters a normal working period, the current detection unit can detect an initial working current value I1 of the compressor and transmits I1 to the current protection control unit, and at the moment, the current protection control unit sets the protection current of the compressor to be I1+ M1; after that, except that the current protection control unit calculates that the first average working current value I2 is I1+ M1 as the protection current, the protection current in other periods during the operation of the compressor is based on the average working current value in the previous period, and M2 amperes is added on the basis of the average working current value in the previous period to be used as overcurrent protection, so that the protection current of the compressor is automatically adjusted according to the change of the working environment temperature, the influence of seasonal changes on the compressor is reduced, the overcurrent protection is accurately performed on the compressor, the type of a protector product is simplified, the design cost of a manufacturer on the protector is reduced, and the development of enterprises is facilitated.
Drawings
Fig. 1 is a schematic diagram of a hardware device connection structure according to the present invention.
Detailed Description
As shown in fig. 1, the adaptive current value control method for a compressor of this embodiment includes a current protection control unit, a temperature sensor, and a current detection unit, where the temperature sensor and the current detection unit are respectively connected to the current protection control unit, the current protection control unit is connected to the compressor, the temperature sensor is used to detect a working environment temperature of the compressor, and the current detection unit is used to detect a working current of the compressor; entering normal operation after compressor start-up:
a) the current detection unit detects that the initial operating current value I1 of the compressor is 1, and transmits the initial operating current value I1 is 1 to the current protection control unit, and then the current protection control unit sets the protection current of the compressor as I1+2 is 1+2 is 3, and M1 of the embodiment is 2, and 2A is added on the basis of the initial operating current value, so that the compressor obtains overcurrent protection, and the protection current performs current protection on the period of the first 9 operating current values measured in b). As is known, when a compressor is started, a starting current far exceeding a rated current value of the compressor is generated, and the starting time of the compressor is short and can be generally finished within 1s, so that in the implementation of the embodiment, after receiving a starting signal 1s of the compressor, a current protection control unit gives a signal to a current detection unit, so that the current detection unit performs first current detection on the compressor, and the current value detected at this time is an initial working current value;
b) the temperature sensor constantly monitors the working environment temperature value of the compressor, the detected working environment temperature value is transmitted to the current protection control unit, the current protection control unit compares the detected working environment temperature value, once the working environment temperature value changes, the current detection unit detects the working current value of the primary compressor and stores the working current value to the current protection control unit, and the working current refers to the current entering the running state after the compressor is started; every time 10 records of the working current value are accumulated, N is 10 in the embodiment, the current protection control unit calculates an average value, which is called as an average working current value I2, for the 10 records, and the current protection control unit modifies the protection current of the compressor to I2+2, and M2 is 2 in the embodiment. The design ensures that the protection current in a certain period of time during the working period of the compressor is based on the average current in the previous period of time, and 2A is added on the basis of the average working current value in the previous period of time to be used as overcurrent protection, so that the compressor can automatically adjust the protection current of the compressor according to the change of the working environment temperature, the influence of seasonal changes on the compressor is reduced, the compressor is accurately subjected to overcurrent protection, the type of a protector product can be simplified, the design cost of a manufacturer on the protector is reduced, and the development of enterprises is facilitated.
This is shown in the following table: in summer, the average value of 10 operating current values recorded by the current protection control unit in a certain period is 1.12, that is, the protection current value after the certain period until the operating current values in the current protection control unit are accumulated to 10 records again is 1.12+2 which is 3.12; in winter, the average value of 10 recorded working current values of the current protection control unit in a certain period is 0.6, namely, the protection current value of 0.6+ 2-2.6 is obtained before the working current values in the current protection control unit are accumulated to 10 records again after the period.
The table of the operating environment temperature value and the operating current value of the compressor of the present embodiment is as follows:
Claims (4)
1. an adaptive current value control method of a compressor, characterized in that: the temperature sensor and the current detection unit are respectively connected with the current protection control unit, the current protection control unit is connected with the compressor, the temperature sensor is used for detecting the working environment temperature of the compressor, and the current detection unit is used for detecting the working current of the compressor; entering normal operation after compressor start-up:
a) the current detection unit detects an initial working current value I1 of the compressor and transmits the initial working current value I1 to the current protection control unit, and then the current protection control unit sets the protection current of the compressor to be I1+ M1;
b) the temperature sensor constantly monitors the working environment temperature value of the compressor and transmits the detected working environment temperature value to the current protection control unit, the current protection control unit compares the detected working environment temperature value, and once the working environment temperature value changes, the current detection unit detects the working current value of the primary compressor and stores the working current value to the current protection control unit; for each N operating current value records accumulated, the current protection control unit calculates an average value, called the average operating current value I2, for the N records, after which the current protection control unit modifies the protection current of the compressor to I2+ M2.
2. The adaptive current value control method of a compressor according to claim 1, wherein: the M1 is more than or equal to 1.5A and less than or equal to M1 and less than or equal to 3A.
3. The adaptive current value control method of a compressor according to claim 1, wherein: the M2 is more than or equal to 1.5A and less than or equal to M2 and less than or equal to 3A.
4. The adaptive current value control method of a compressor according to claim 1, wherein: n is more than or equal to 5.
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| CN201810851227.5A CN109059375B (en) | 2018-07-30 | 2018-07-30 | Self-adaptive current value control method of compressor |
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| CN201810851227.5A CN109059375B (en) | 2018-07-30 | 2018-07-30 | Self-adaptive current value control method of compressor |
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| CN109059375B true CN109059375B (en) | 2020-12-01 |
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