CN114264052A - Refrigeration control method and air conditioner - Google Patents
Refrigeration control method and air conditioner Download PDFInfo
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- CN114264052A CN114264052A CN202111602244.3A CN202111602244A CN114264052A CN 114264052 A CN114264052 A CN 114264052A CN 202111602244 A CN202111602244 A CN 202111602244A CN 114264052 A CN114264052 A CN 114264052A
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- air conditioner
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses a refrigeration control method and an air conditioner, comprising the following steps: when the refrigeration mode is operated, judging whether the outdoor environment temperature is less than or equal to the preset environment temperature or not and whether the indoor return air temperature is greater than or equal to the preset indoor return air temperature or not; if yes, the corresponding parts of the air conditioner are controlled to adjust the flow of the refrigerant or change the heat exchange quantity of the outdoor side according to the comparison result of the suction superheat degree and the suction superheat degree set value and the comparison result of the exhaust superheat degree and the exhaust superheat degree set value. According to the invention, the flow of the refrigerant or the heat exchange quantity of the outdoor side of the corresponding part of the air conditioner is controlled by the current values of the suction superheat degree and the exhaust superheat degree, so that when the fixed-frequency air conditioner operates in a refrigeration mode in a low-temperature environment, the flow of the refrigerant and the heat exchange quantity of the outdoor side can be controlled according to the actual temperature of the refrigerant, the phenomenon of liquid impact generated in the compressor due to insufficient heat exchange is avoided, the use requirement of a user is met, and the operation reliability and stability of a unit are improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a refrigeration control method and an air conditioner.
Background
Under the condition of refrigerating operation of the air conditioner in a transition season, due to the change of the ambient temperature, the outdoor ambient temperature is reduced for some special industries, but a client still needs to continue refrigerating and maintain the stability of the indoor ambient temperature, most of the air conditioning equipment is a variable frequency compressor, and a control system is complex. The fixed-frequency compressor has fixed frequency, operates in a transition season, and needs to operate at full load, so that the system has poor operation stability and reliability, and the requirements of customers cannot be met.
Disclosure of Invention
The invention provides a refrigeration control method and an air conditioner, aiming at solving the technical problem that the system stability is poor when a fixed-frequency compressor performs low-temperature refrigeration in the prior art.
The technical scheme adopted by the invention is as follows:
the invention provides a refrigeration control method, which comprises the following steps:
when the refrigeration mode is operated, judging whether the outdoor environment temperature is less than or equal to the preset environment temperature or not and whether the indoor return air temperature is greater than or equal to the preset indoor return air temperature or not;
if yes, the corresponding parts of the air conditioner are controlled to adjust the flow of the refrigerant or change the heat exchange quantity of the outdoor side according to the comparison result of the suction superheat degree and the suction superheat degree set value and the comparison result of the exhaust superheat degree and the exhaust superheat degree set value.
And when the suction superheat degree is continuously less than the suction superheat degree set value within the preset time and the exhaust superheat degree is continuously greater than or equal to the exhaust superheat degree set value, controlling the electronic expansion valve to reduce the preset steps.
And when the suction superheat degree is continuously smaller than the suction superheat degree set value and the exhaust superheat degree is continuously smaller than the exhaust superheat degree set value within the preset time, controlling the electronic expansion valve to reduce the preset steps and controlling the outdoor fan to reduce the preset rotating speed.
And when the suction superheat degree is continuously greater than or equal to the suction superheat degree set value within the preset time and the exhaust superheat degree is continuously less than the exhaust superheat degree set value, controlling the outdoor fan to reduce the preset rotating speed.
And when the suction superheat degree is continuously greater than or equal to the suction superheat degree set value within the preset time and the exhaust superheat degree is continuously greater than or equal to the exhaust superheat degree set value, controlling corresponding parts of the air conditioner to maintain the current state.
And further, after the corresponding parts of the control air conditioner are operated, maintaining the current operation state for a second preset time, and returning to the step of judging whether the outdoor environment temperature is less than or equal to the preset environment temperature and whether the indoor return air temperature is greater than or equal to the preset indoor return air temperature.
Preferably, the preset ambient temperature is-8 to-12 degrees.
Preferably, the value of the preset indoor return air temperature is 18-24 degrees.
The invention also provides an air conditioner which uses the refrigeration control method to adjust the flow of the refrigerant or change the heat exchange quantity of the outdoor side to improve the stability.
Specifically, the air conditioner is a fixed-frequency air conditioner.
Compared with the prior art, the invention controls the corresponding parts of the air conditioner to adjust the flow of the refrigerant or change the heat exchange quantity of the outdoor side by the current values of the suction superheat degree and the exhaust superheat degree, so that when the fixed-frequency air conditioner operates in a refrigeration mode in a low-temperature environment, the flow of the refrigerant and the heat exchange quantity of the outdoor side can be controlled according to the actual temperature of the refrigerant, the phenomenon of liquid impact generated in the compressor due to insufficient heat exchange is avoided, the use requirement of a user is met, and the operation reliability and the stability of the unit are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a flow chart in an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and 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 principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
As shown in fig. 1, the present invention provides a refrigeration control method for an air conditioner, specifically a fixed-frequency air conditioner, including the steps of: when the air conditioner runs in a refrigeration mode, judging whether the outdoor environment temperature Tw is less than or equal to the preset environment temperature or not and whether the indoor return air temperature Tn is greater than or equal to the preset indoor return air temperature or not; if so, controlling corresponding parts of the air conditioner to adjust the flow of the refrigerant or change the heat exchange quantity of the outdoor side according to the comparison result of the air suction superheat degree delta T and the air suction superheat degree set value and the comparison result of the exhaust superheat degree delta TL and the exhaust superheat degree set value, and if not, normally operating the air conditioner. When the fixed-frequency air conditioner operates in a refrigeration mode in a low-temperature environment, the flow of the refrigerant and the heat exchange quantity of the outdoor side can be controlled according to the temperature of the refrigerant, the phenomenon of liquid impact caused by insufficient heat exchange in the compressor is avoided, the use requirement is met, and the operation reliability and stability of the unit are improved.
Note that the intake superheat Δ T is a difference obtained by subtracting a saturation temperature corresponding to the low pressure from an intake temperature (on the intake side of the compressor) in the current operation, and the exhaust superheat Δ TL is a difference obtained by subtracting a saturation temperature corresponding to the high pressure from an exhaust temperature (on the exhaust side of the compressor).
In the above steps, the following four comparison results are specifically included according to the intake superheat and the intake superheat set value, and the exhaust superheat set value.
The first method comprises the following steps: when the suction superheat degree is less than the suction superheat degree set value within n minutes of continuous preset time, and the exhaust superheat degree is greater than or equal to the exhaust superheat degree set value; in the preset time n minutes (the preset can be set according to the actual condition), the suction superheat degree is continuously less than the suction superheat degree set value, and the exhaust superheat degree is continuously greater than or equal to the exhaust superheat degree set value, so that the judgment error caused by sudden abnormality of parameters is avoided. The controller of the air conditioner controls the electronic expansion valve to reduce the preset step number b, wherein the range of the preset step number b is more than or equal to 5 and less than or equal to 10, so that the flow of the refrigerant is reduced, and the system abnormity caused by too small suction superheat degree is avoided.
And the second method comprises the following steps: when the suction superheat degree is smaller than the suction superheat degree set value within n minutes of continuous preset time, and the exhaust superheat degree is smaller than the exhaust superheat degree set value; in the preset time n minutes (the preset can be set according to the actual condition), the air suction superheat degree is continuously smaller than the air suction superheat degree set value, and the exhaust superheat degree is continuously smaller than the exhaust superheat degree set value, so that the judgment error caused by unstable parameters is avoided. Controlling the electronic expansion valve to reduce the preset steps and the refrigerant flow, and simultaneously controlling the outdoor fan to reduce the preset rotating speed r, wherein the range of the preset rotating speed r is as follows: r is more than or equal to 100 and less than or equal to 200, and the unit is min/r. The heat exchange amount of the outdoor side in a low-temperature environment is reduced, the supercooling degree of the unit is not too large, and the phenomenon that the evaporation temperature is too low and the heat exchange is insufficient is avoided, so that the suction temperature is too low and the liquid impact phenomenon is generated to damage the compressor.
And the third is that: when the suction superheat degree is larger than or equal to the suction superheat degree set value within the continuous preset time n and the exhaust superheat degree is smaller than or equal to the exhaust superheat degree set value, namely within the preset time n minutes (the preset can be set according to actual conditions), the suction superheat degree is continuously larger than or equal to the suction superheat degree set value and the exhaust superheat degree is continuously smaller than or equal to the exhaust superheat degree set value, so that judgment errors caused by sudden abnormity of parameters are avoided. And controlling the outdoor fan to reduce the rotating speed. The heat exchange quantity of the outdoor side in the low-temperature environment can be reduced, and the air suction temperature is improved.
Fourthly, when the suction superheat degree is larger than or equal to the suction superheat degree set value within n minutes of continuous preset time, and the exhaust superheat degree is larger than or equal to the exhaust superheat degree set value, namely within n minutes of the preset time (the preset can be set according to actual conditions), the suction superheat degree is continuously larger than or equal to the suction superheat degree set value, and the exhaust superheat degree is continuously larger than or equal to the exhaust superheat degree set value, so that judgment errors caused by sudden abnormity of parameters are avoided. The components controlling the air conditioner maintain the current state. The air conditioner is in a normal operation state at this time.
And after the corresponding parts of the air conditioner are operated and controlled, namely the four conditions are carried out, continuously operating for a second preset time N, returning to the step of judging whether the outdoor environment temperature is less than or equal to the preset environment temperature and whether the indoor return air temperature is greater than or equal to the preset indoor return air temperature, and carrying out circulation control to ensure that the air conditioning unit is always in a stable operation state.
Specifically, the preset ambient temperature is-8 to-12 degrees, the preset indoor return air temperature is 18 to 24 degrees, for example, the preset ambient temperature is-10 degrees, and the preset indoor return air temperature is 20 degrees. The second preset time N may be a duration of one to two minutes, and the preset time N may be set within one minute. The specific time length or temperature is only for facilitating understanding of the invention and does not limit the protection scope of the invention, and the specific value can be set according to the actual requirement.
The invention also provides an air conditioner, namely a fixed-frequency air conditioner, and the control method is used for ensuring the stable operation of the air conditioner during low-temperature refrigeration.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A refrigeration control method, characterized by comprising the steps of:
when the refrigeration mode is operated, judging whether the outdoor environment temperature is less than or equal to the preset environment temperature or not and whether the indoor return air temperature is greater than or equal to the preset indoor return air temperature or not;
if yes, the corresponding parts of the air conditioner are controlled to adjust the flow of the refrigerant or change the heat exchange quantity of the outdoor side according to the comparison result of the suction superheat degree and the suction superheat degree set value and the comparison result of the exhaust superheat degree and the exhaust superheat degree set value.
2. A refrigeration control method as recited in claim 1, wherein when said suction superheat continues to be less than said suction superheat setpoint for a predetermined period of time, and said discharge superheat continues to be greater than or equal to said discharge superheat setpoint, said electronic expansion valve is controlled to decrease by a predetermined number of steps.
3. A refrigeration control method as recited in claim 1, wherein when said suction superheat is continuously less than said suction superheat setting for a predetermined period of time and said discharge superheat is continuously less than said discharge superheat setting, said electronic expansion valve is controlled to decrease a predetermined number of steps and said outdoor fan is controlled to decrease a predetermined rotational speed.
4. The refrigeration control method as set forth in claim 1, wherein when said suction superheat is continuously equal to or greater than said suction superheat setting value for a predetermined time and said discharge superheat is continuously less than said discharge superheat setting value, the outdoor fan is controlled to be lowered to a predetermined rotational speed.
5. A refrigeration control method as recited in claim 1, wherein when said suction superheat is continuously greater than or equal to said suction superheat setting value for a predetermined time and said discharge superheat is continuously greater than or equal to said discharge superheat setting value, the corresponding component of the air conditioner is controlled to maintain the current state.
6. The refrigeration control method as claimed in claim 1, wherein after the corresponding components of the air conditioner are operated, the current operation state is maintained for a second preset time, and the step of determining whether the outdoor ambient temperature is less than or equal to the preset ambient temperature and the indoor return air temperature is greater than or equal to the preset indoor return air temperature is returned.
7. The refrigeration control method as recited in claim 1 wherein said predetermined ambient temperature is between-8 and-12 degrees.
8. The refrigeration control method as set forth in claim 1, wherein said preset indoor return air temperature is 18 to 24 degrees.
9. An air conditioner, characterized in that, the stability is improved by adjusting the flow rate of the refrigerant or changing the heat exchange amount of the outdoor side by using the refrigeration control method as claimed in any one of claims 1 to 8.
10. The air conditioner according to claim 9, wherein the air conditioner is a constant frequency air conditioner.
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| CN202111602244.3A CN114264052B (en) | 2021-12-24 | 2021-12-24 | Refrigeration control method and air conditioner |
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| CN202111602244.3A CN114264052B (en) | 2021-12-24 | 2021-12-24 | Refrigeration control method and air conditioner |
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| CN114264052A true CN114264052A (en) | 2022-04-01 |
| CN114264052B CN114264052B (en) | 2023-03-17 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1645017A (en) * | 2003-10-17 | 2005-07-27 | Lg电子株式会社 | Apparatus and method for controlling the super-heating degree in a heat pump system |
| JP2016217615A (en) * | 2015-05-20 | 2016-12-22 | パナソニックＩｐマネジメント株式会社 | Refrigeration cycle device |
| CN106765913A (en) * | 2016-12-02 | 2017-05-31 | 青岛海尔空调器有限总公司 | Fixed frequency air conditioner not halt control method |
| CN110410944A (en) * | 2019-07-23 | 2019-11-05 | 宁波奥克斯电气股份有限公司 | A kind of compress control method of air conditioner, control device and air conditioner |
| CN110513818A (en) * | 2019-08-29 | 2019-11-29 | Tcl空调器(中山)有限公司 | A kind of air conditioner refrigerating or heat-production control method, air-conditioning and storage medium |
| CN113465113A (en) * | 2021-05-21 | 2021-10-01 | 宁波奥克斯电气股份有限公司 | Control method and device for low-temperature refrigeration of air conditioner and air conditioner |
-
2021
- 2021-12-24 CN CN202111602244.3A patent/CN114264052B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1645017A (en) * | 2003-10-17 | 2005-07-27 | Lg电子株式会社 | Apparatus and method for controlling the super-heating degree in a heat pump system |
| JP2016217615A (en) * | 2015-05-20 | 2016-12-22 | パナソニックＩｐマネジメント株式会社 | Refrigeration cycle device |
| CN106765913A (en) * | 2016-12-02 | 2017-05-31 | 青岛海尔空调器有限总公司 | Fixed frequency air conditioner not halt control method |
| CN110410944A (en) * | 2019-07-23 | 2019-11-05 | 宁波奥克斯电气股份有限公司 | A kind of compress control method of air conditioner, control device and air conditioner |
| CN110513818A (en) * | 2019-08-29 | 2019-11-29 | Tcl空调器(中山)有限公司 | A kind of air conditioner refrigerating or heat-production control method, air-conditioning and storage medium |
| CN113465113A (en) * | 2021-05-21 | 2021-10-01 | 宁波奥克斯电气股份有限公司 | Control method and device for low-temperature refrigeration of air conditioner and air conditioner |
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| CN114264052B (en) | 2023-03-17 |
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