CN111536022B - Control method and device for compressor anti-freezing protection and computer readable storage medium - Google Patents
Control method and device for compressor anti-freezing protection and computer readable storage medium Download PDFInfo
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- CN111536022B CN111536022B CN202010335701.6A CN202010335701A CN111536022B CN 111536022 B CN111536022 B CN 111536022B CN 202010335701 A CN202010335701 A CN 202010335701A CN 111536022 B CN111536022 B CN 111536022B
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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
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
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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
- F04B49/10—Other safety measures
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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Air Conditioning Control Device (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention provides a control method, a device and a computer readable storage medium for compressor anti-freezing protection, wherein a plurality of temperature thresholds are preset, and a plurality of temperature intervals are respectively formed according to a frequency reduction process and a frequency increase process, and the method comprises the following steps: acquiring the real-time temperature of the evaporator detected by a sensor, and comparing the acquired real-time temperature with a plurality of temperature intervals corresponding to the current frequency reduction process or frequency increase process; when the real-time temperature is in a first interval, controlling the compressor to operate according to a preset main control program; when the real-time temperature is in a second interval, controlling the compressor to operate the frequency reduction regulation only according to a frequency reduction instruction of a preset main control program; when the real-time temperature is in a third interval, controlling the compressor to perform frequency reduction regulation according to a preset frequency regulation value; when the real-time temperature is in the fourth interval, the compressor is controlled to stop, the frosting risk can be reduced, and the purpose of prolonging the service life of the machine is achieved.
Description
Technical Field
The invention relates to the technical field of heating ventilation, in particular to a control method and device for compressor anti-freezing protection and a computer readable storage medium.
Background
With the rapid development of modern cities and the rapid development of modern cities, the efficient utilization of energy has an important role in the sustainable development of cities and the reduction of carbon emission. Air conditioners and heat pumps are reasonable high-efficiency energy modes, and multiple portions of heat energy can be obtained by using only one portion of electric energy by utilizing the Carnot cycle principle. During the operation of air conditioners and heat pumps, the evaporator often becomes frosted or even frozen, in which case the overall operating efficiency of the machine is reduced, and it is also easy to cause wear of the compressor, reducing its service life.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a control method, a control device and a computer readable storage medium for compressor anti-freezing protection, which can reduce the risk of frosting and achieve the purpose of prolonging the service life of a machine.
The invention provides a control method for compressor anti-freezing protection, which presets a plurality of temperature thresholds and respectively forms a plurality of temperature intervals according to a frequency reduction process and a frequency increase process, and comprises the following steps: acquiring the real-time temperature of the evaporator detected by a sensor, and comparing the acquired real-time temperature with a plurality of temperature intervals corresponding to the current frequency reduction process or the frequency increasing process; when the real-time temperature is in a first interval, controlling the compressor to operate according to a preset main control program; when the real-time temperature is in a second interval, controlling the compressor to operate the frequency reduction regulation only according to a frequency reduction instruction of a preset main control program; when the real-time temperature is in a third interval, controlling the compressor to perform frequency reduction regulation by using a preset frequency regulation value; and when the real-time temperature is in the fourth interval, controlling the compressor to stop.
Preferably, when the real-time temperature is in the first interval, the step of controlling the compressor to operate according to a preset main control program includes: when the real-time temperature is in a recovery interval in the process of frequency reduction or frequency increase, controlling the compressor to operate according to a preset main control program; and when the real-time temperature is positioned in the up interval in the frequency reduction or frequency increase process, controlling the compressor to operate according to a preset main control program.
Preferably, when Tc is more than D in the process of frequency reduction or Tc is more than D1 in the process of frequency increase, the real-time temperature is judged to be positioned in the recovery interval; when C is more than Tc and less than or equal to D in the frequency reducing process or C1 is more than Tc and less than or equal to D1 in the frequency increasing process, the real-time temperature is judged to be in the up interval.
Preferably, when the real-time temperature is in the second interval, the step of controlling the compressor to perform the down-conversion adjustment only according to the down-conversion instruction of the preset main control program includes: and when the real-time temperature is positioned in the up forbidden interval in the frequency reducing or increasing process, controlling the compressor to only operate the frequency reducing regulation according to a frequency reducing instruction of a preset main control program.
Preferably, when B < Tc ≦ C in the down-conversion process or B1 < Tc ≦ C1 in the up-conversion process, the real-time temperature is determined to be in the up-prohibited range.
Preferably, when the real-time temperature is in the third interval, the step of controlling the compressor to perform down-conversion adjustment at the preset frequency adjustment value includes: and when the real-time temperature is in the down interval in the frequency reduction or frequency increase process, controlling the compressor to carry out frequency reduction regulation by a preset frequency regulation value.
Preferably, when A < Tc ≦ B in the down-conversion process or A1 < Tc ≦ B1 in the up-conversion process, the real-time temperature is determined to be in the down interval.
Preferably, when the real-time temperature is in the fourth interval, the step of controlling the compressor to stop includes: and when the real-time temperature is positioned in the stopping interval in the frequency reducing or increasing process, controlling the compressor to stop, wherein when Tc is less than or equal to A in the frequency reducing process or Tc is less than or equal to A1 in the frequency increasing process, judging that the real-time temperature is positioned in the stopping interval.
The present invention also provides a compressor control device comprising a control method of compressor anti-freeze protection as claimed in the preceding claims.
The invention also provides a computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to the preceding claims.
Compared with the scheme in the prior art, the invention has the advantages that: the invention provides a control method and a control device for compressor anti-freezing protection and a computer readable storage medium, which adjust the running frequency of a compressor according to the temperature of an evaporator, adjust the frequency of the compressor in stages, relieve the frosting and freezing conditions of a machine, effectively avoid the reduction of the running efficiency of the machine, reduce the use cost of the machine and prolong the service life of the machine.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a flow chart illustrating a control method for compressor anti-freeze protection according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a temperature range according to an embodiment of the invention.
FIG. 3 is a schematic flow chart illustrating a control method for compressor anti-freeze protection according to another embodiment of the present invention.
Detailed Description
The above-described scheme is further illustrated below with reference to specific examples. It should be understood that these examples are for illustrative purposes and are not intended to limit the scope of the present invention. The conditions employed in the examples may be further adjusted as determined by the particular manufacturer, and the conditions not specified are generally those used in routine experimentation.
The present application provides a control method for compressor anti-freezing protection, in which a plurality of temperature thresholds are preset, and a plurality of temperature intervals are respectively formed according to a frequency reduction process and a frequency increase process, the method includes: acquiring the real-time temperature of the evaporator detected by a sensor, and comparing the acquired real-time temperature with a plurality of temperature intervals corresponding to the current frequency reduction process or frequency increase process; when the real-time temperature is in a first interval, controlling the compressor to operate according to a preset main control program; when the real-time temperature is in a second interval, controlling the compressor to operate the frequency reduction regulation only according to a frequency reduction instruction of a preset main control program; when the real-time temperature is in a third interval, controlling the compressor to perform frequency reduction regulation by using a preset frequency regulation value; when the real-time temperature is in the fourth interval, the compressor is controlled to stop, the frosting risk can be reduced, and the purpose of prolonging the service life of the machine is achieved.
The control method of the compressor anti-freeze protection proposed by the present application is described next with reference to the accompanying drawings.
Referring to fig. 1, the present invention provides a method for controlling anti-freeze protection of a compressor, which presets a plurality of temperature thresholds, and respectively forms a plurality of temperature intervals according to a down-conversion process and an up-conversion process, wherein the method comprises the following steps:
and S10, acquiring the real-time temperature of the evaporator detected by the sensor, and comparing the acquired real-time temperature with a plurality of temperature intervals corresponding to the current frequency reduction process or the frequency increasing process. The evaporator of the compressor is provided with the temperature sensor, and the temperature sensor is used for measuring a temperature value Tc in real time. A plurality of different temperature thresholds are respectively preset in a program of the controller according to the frequency increasing process and the frequency decreasing process, a plurality of temperature intervals are formed by the plurality of temperature thresholds, and the controller judges the temperature interval to which the real-time measured temperature Tc belongs.
Referring to fig. 2, in one embodiment of the present invention, a plurality of different temperature thresholds are preset in the controller, for example, in the frequency reduction process, the temperature thresholds a, B, C, D are preset, the four temperatures are divided into 5 temperature intervals, the recovery interval is located when the temperature Tc > D, the up interval is located when the temperature C < Tc ≦ D, the up prohibition interval is located when the temperature B < Tc ≦ C, the down interval is located when the temperature a < Tc ≦ B, and the stop interval is located when the temperature Tc ≦ a. In the frequency raising process, temperature thresholds A1, B1, C1 and D1 are preset, the four temperatures are divided into 5 temperature intervals, the four temperature intervals are in a recovery interval when the temperature Tc is more than D1, are in an up interval when the temperature C1 < Tc is less than or equal to D1, are in an up prohibition interval when the temperature B1 < Tc is less than or equal to C1, are in a down interval when the temperature A1 < Tc is less than or equal to B1, and are in a stop interval when the temperature Tc is less than or equal to A1.
And S20, controlling the compressor to operate according to a preset main control program when the real-time temperature is in the first interval.
Referring to fig. 3, in one embodiment of the present invention, the step S20 specifically includes the following steps:
step S21, when the real-time temperature is in the recovery interval in the process of frequency reduction or frequency increase, controlling the compressor to operate according to a preset main control program;
and step S22, when the real-time temperature is in the up interval in the process of frequency reduction or frequency increase, controlling the compressor to operate according to a preset main control program.
And S30, when the real-time temperature is in the second interval, controlling the compressor to operate the down-conversion regulation only according to the down-conversion instruction of the preset main control program.
And S40, when the real-time temperature is in the third interval, controlling the compressor to perform down-conversion adjustment at a preset frequency adjustment value.
And S50, when the real-time temperature is in the fourth interval, controlling the compressor to stop.
In one embodiment of the present invention, during the down-conversion process, the following adjustments are performed:
when Tc is more than D, judging that the current temperature Tc is in a recovery interval, and controlling the compressor to operate according to a preset main control program in the controller;
when the C is more than Tc and less than or equal to D, judging that the real-time temperature is positioned in the up interval, and controlling the compressor to operate according to a preset main control program;
when B is more than Tc and less than or equal to C, judging that the real-time temperature is positioned in the up forbidden interval, controlling the compressor to operate according to a preset main control program, but only receiving a frequency reduction instruction to operate frequency reduction regulation in the up forbidden interval, and not performing frequency increase regulation;
and when the A is more than the Tc and less than or equal to the B, judging that the real-time temperature is positioned in a down interval, controlling the compressor to perform frequency reduction regulation by a preset frequency regulation value, and reducing the frequency of delta H every time delta T.
And when Tc is less than or equal to A, judging that the real-time temperature is in the stop interval, and controlling the compressor to stop.
In one embodiment of the present invention, during the frequency up-conversion, the following adjustment is performed:
when Tc is more than D1, judging that the current temperature Tc is in a recovery interval, and controlling the compressor to operate according to a preset main control program in the controller;
when the Tc is more than C1 and less than or equal to D1, judging that the real-time temperature is in the up interval, and controlling the compressor to operate according to a preset main control program;
when the Tc is more than B1 and less than or equal to C1, the real-time temperature is judged to be in the up forbidden interval, the compressor is controlled to operate according to a preset main control program, but only the frequency reduction instruction is received to operate the frequency reduction regulation in the up forbidden interval, and the frequency increase regulation cannot be carried out;
and when the Tc is more than A1 and less than or equal to B1, judging that the real-time temperature is in a down interval, controlling the compressor to perform frequency reduction regulation by a preset frequency regulation value, and reducing the frequency of delta H every time of delta T.
And when Tc is less than or equal to A1, judging that the real-time temperature is in the stop interval, and controlling the compressor to stop.
The control method for the compressor anti-freezing protection according to the embodiments includes detecting a real-time temperature of an evaporator through a temperature sensor, judging a temperature interval where the real-time temperature is located in a frequency reduction process or a frequency rise process, and adopting different control modes according to different temperature intervals, wherein when the temperature is in a first interval, the compressor is controlled to operate according to a preset main program, when the temperature is in a second interval, the compressor is controlled to perform frequency reduction adjustment only according to a frequency reduction instruction of the preset main program, and when the temperature is in a third interval, the compressor is controlled to perform frequency reduction adjustment according to a preset frequency adjustment value; when the real-time temperature is in the fourth interval, the compressor is controlled to stop, the running frequency of the compressor is adjusted according to the temperature of the evaporator in real time, the frequency of the compressor is adjusted in stages, the frosting and freezing conditions of the machine are relieved, the running efficiency of the machine is effectively prevented from being reduced, the use cost of the machine is reduced, and the service life of the machine is prolonged.
The invention also provides a control device of the compressor, which is used for executing the control method for the anti-freezing protection of the compressor, comprising the above embodiments.
The present invention also provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the control method for compressor anti-freeze protection described in the above embodiments.
According to the invention, the temperature sensor is arranged on the evaporator, and the compressor is subjected to staged frequency reduction control based on different temperature division temperature intervals in the frequency reduction process and the frequency increasing process according to a preset program, so that the frosting condition of the evaporator is effectively relieved under the condition of maintaining the continuous operation of the machine, the operation efficiency of the machine is improved, and the possibility of shutdown is reduced.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (8)
1. A control method for compressor anti-freezing protection is characterized in that a plurality of temperature thresholds are preset, a plurality of temperature intervals are respectively formed according to a frequency reduction process and a frequency increasing process, the running frequency of a compressor is adjusted according to the temperature of an evaporator, and the frequency of the compressor is adjusted in stages, and the method comprises the following steps:
acquiring the real-time temperature of the evaporator detected by a sensor, and comparing the acquired real-time temperature with a plurality of temperature intervals corresponding to the current frequency reduction process or the frequency increasing process;
when the real-time temperature is in the first interval, the compressor is controlled to operate according to a preset main control program, and the method specifically comprises the following steps:
when the real-time temperature is in a recovery interval in the process of frequency reduction or frequency increase, controlling the compressor to operate according to a preset main control program;
when the real-time temperature is positioned in the up interval in the process of frequency reduction or frequency increase, the compressor is controlled to operate according to a preset main control program,
when the real-time temperature is in a second interval, controlling the compressor to operate according to a preset main control program, and only receiving a frequency reduction instruction to operate the frequency reduction regulation, but not performing the frequency increase regulation;
when the real-time temperature is in a third interval, controlling the compressor to perform frequency reduction regulation by using a preset frequency regulation value;
and when the real-time temperature is in the fourth interval, controlling the compressor to stop.
2. The control method for compressor antifreeze protection as claimed in claim 1, wherein, when Tc > D during down conversion or Tc > D1 during up conversion, the real-time temperature is determined to be in the recovery interval;
when C is more than Tc and less than or equal to D in the frequency reducing process or C1 is more than Tc and less than or equal to D1 in the frequency increasing process, the real-time temperature is judged to be in the up interval.
3. The method as claimed in claim 1, wherein when the real-time temperature is in the second interval, the step of controlling the compressor to operate according to a preset main control program, and only receiving a down-conversion command to operate down-conversion adjustment, and the step of disabling up-conversion adjustment comprises:
and when the real-time temperature is positioned in the up forbidden interval in the frequency reduction or frequency increase process, controlling the compressor to only operate the frequency reduction regulation according to a frequency reduction instruction of a preset main control program.
4. The method as claimed in claim 3, wherein when B < Tc ≦ C during down-conversion or B1 < Tc ≦ C1 during up-conversion, the real-time temperature is determined to be in the up-prohibited range.
5. The method as claimed in claim 1, wherein the step of controlling the compressor to perform down-regulation at the preset frequency adjustment value when the real-time temperature is within the third interval comprises:
and when the real-time temperature is in the down interval in the process of frequency reduction or frequency increase, controlling the compressor to carry out frequency reduction adjustment by using a preset frequency adjustment value.
6. The control method of claim 5, wherein when A < Tc ≦ B in the down-conversion process or A1 < Tc ≦ B1 in the up-conversion process, it is determined that the real-time temperature is in the down interval.
7. A control apparatus of a compressor, characterized in that it comprises a control method of antifreeze protection of a compressor according to any of claims 1 to 6.
8. A computer-readable storage medium, in which a computer program is stored, which computer program, when being executed by a processor, is adapted to carry out the steps of a method for controlling compressor freeze protection according to any one of claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010335701.6A CN111536022B (en) | 2020-04-25 | 2020-04-25 | Control method and device for compressor anti-freezing protection and computer readable storage medium |
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| CN202010335701.6A CN111536022B (en) | 2020-04-25 | 2020-04-25 | Control method and device for compressor anti-freezing protection and computer readable storage medium |
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| CN111536022B true CN111536022B (en) | 2022-07-22 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112361523A (en) * | 2020-10-09 | 2021-02-12 | 浙江吉利控股集团有限公司 | Control method and device of air conditioner and computer readable storage medium |
| CN114489235A (en) * | 2022-01-18 | 2022-05-13 | 上海天数智芯半导体有限公司 | Chip frequency dynamic adjustment method and system for abnormal temperature processing |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103115417A (en) * | 2013-03-19 | 2013-05-22 | 海尔集团公司 | Refrigeration method of low temperature environment air conditioner |
| JP2017198349A (en) * | 2016-04-25 | 2017-11-02 | パナソニックＩｐマネジメント株式会社 | Air conditioning device |
| JP2017196132A (en) * | 2016-04-27 | 2017-11-02 | 東芝ライフスタイル株式会社 | Dryer |
| CN108224704A (en) * | 2017-12-25 | 2018-06-29 | 青岛海尔空调电子有限公司 | The control method of air-conditioning |
| CN109210696A (en) * | 2018-09-10 | 2019-01-15 | 青岛海尔空调器有限总公司 | A kind of control method of air-conditioning anti-freeze protection |
-
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103115417A (en) * | 2013-03-19 | 2013-05-22 | 海尔集团公司 | Refrigeration method of low temperature environment air conditioner |
| JP2017198349A (en) * | 2016-04-25 | 2017-11-02 | パナソニックＩｐマネジメント株式会社 | Air conditioning device |
| JP2017196132A (en) * | 2016-04-27 | 2017-11-02 | 東芝ライフスタイル株式会社 | Dryer |
| CN108224704A (en) * | 2017-12-25 | 2018-06-29 | 青岛海尔空调电子有限公司 | The control method of air-conditioning |
| CN109210696A (en) * | 2018-09-10 | 2019-01-15 | 青岛海尔空调器有限总公司 | A kind of control method of air-conditioning anti-freeze protection |
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