CN110864475A - Control method and device for air conditioner return air superheat degree, air conditioner and storage medium - Google Patents
Control method and device for air conditioner return air superheat degree, air conditioner and storage medium Download PDFInfo
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- CN110864475A CN110864475A CN201911215791.9A CN201911215791A CN110864475A CN 110864475 A CN110864475 A CN 110864475A CN 201911215791 A CN201911215791 A CN 201911215791A CN 110864475 A CN110864475 A CN 110864475A
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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
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
Abstract
The invention provides a method and a device for controlling the return air superheat degree of an air conditioner, the air conditioner and a storage medium, belonging to the technical field of air conditioners, and the method for controlling the return air superheat degree of the air conditioner comprises the following steps: when the air conditioner is started, controlling an auxiliary electronic expansion valve to be in a closed state and setting the opening degree of the auxiliary electronic expansion valve to be the maximum value; when the air conditioner operates stably, acquiring the return air temperature and the return air pressure of the current compressor; calculating the current evaporation temperature according to the return air pressure; and controlling the opening degree of the auxiliary electronic expansion valve according to the return air temperature and the evaporation temperature.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method and a device for controlling the superheat degree of return air of an air conditioner, the air conditioner and a storage medium.
Background
In the prior art, in order to avoid liquid entrainment in return air and liquid impact on a compressor, the return air of an air conditioner is usually designed to have a certain superheat degree; however, once the throttle capillary of the constant-frequency air conditioner is determined, the corresponding degree of superheat of the return air is no longer controllable, and the problem of overlarge degree of superheat of the return air can occur due to different ambient temperatures when the air conditioner is in normal operation.
The superheat degree of the return air is too high, the refrigerant is completely evaporated in the evaporator too early, the latter half section of the evaporator absorbs the environmental heat by sensible heat, and the heat exchange effect is poor; and because the air suction temperature rises, the air suction ratio volume increases, the refrigerant mass flow rate decreases, the refrigerating capacity decreases, and meanwhile, the exhaust temperature rises, so that the probability of exhaust protection of the compressor is increased, the adaptability of the air conditioner environment is poor, in addition, the pressure ratio of the compressor rises, the input power of the compressor is increased, and the energy efficiency ratio also decreases. Therefore, how to solve the problem of excessive return air superheat in the constant-frequency air conditioner is a problem to be solved urgently at present.
Disclosure of Invention
The invention solves the problems that the prior fixed-frequency air conditioner has poor heat exchange effect, reduced refrigerating capacity, poor environmental adaptability of the air conditioner and low energy efficiency ratio of the compressor caused by overlarge return air superheat degree.
In order to solve the above problems, the present invention provides a method for controlling the superheat degree of return air of an air conditioner, comprising: when the air conditioner is started, the auxiliary electronic expansion valve is in a closed state and the opening degree of the auxiliary electronic expansion valve is set to be the maximum value; when the air conditioner operates stably, acquiring the return air temperature and the return air pressure of the current compressor; calculating the current evaporation temperature according to the return air pressure; and controlling the opening degree of the auxiliary electronic expansion valve according to the return air temperature and the evaporation temperature.
Therefore, when the air conditioner is started, in order to ensure that the auxiliary electronic expansion valve is completely closed, the opening degree of the auxiliary electronic expansion valve needs to be set to be the maximum value; after the air conditioner operates stably, acquiring the return air temperature and the return air pressure of the compressor; the current evaporation temperature is calculated according to the return air temperature and the return air pressure of the return air pipeline, and the opening degree of the auxiliary electronic valve is finally controlled, so that the return air superheat degree of the return air pipeline of the compressor is controlled in an ideal state, and the comfort degree of a user using an air conditioner is guaranteed.
Further, controlling the opening degree of the auxiliary electronic expansion valve according to the return air temperature and the evaporation temperature includes:
when the difference value between the return air temperature and the evaporation temperature is smaller than A, controlling the auxiliary electronic expansion valve to keep an original opening state;
and when the difference value between the return air temperature and the evaporation temperature is more than or equal to A, controlling the auxiliary electronic expansion valve to increase by M steps in the original opening state.
Therefore, the difference value of the return air temperature and the evaporation temperature is judged firstly, the auxiliary electronic expansion valve is controlled through the judgment of the magnitude value of the difference value, when the difference value of the return air temperature and the evaporation temperature is smaller than A, the superheat degree of the return air on a return air pipeline of the compressor is in a reasonable state, and the original opening state of the auxiliary electronic expansion valve can be maintained; if the difference between the return air temperature and the evaporation temperature is more than or equal to 1, the superheat degree of the return air on the return air pipeline of the compressor is overlarge, and therefore, the superheat degree of the return air is reduced by controlling the opening degree of the auxiliary electronic expansion valve.
Further, controlling the opening degree of the auxiliary electronic expansion valve according to the return air temperature and the evaporation temperature, further comprising: and when the auxiliary electronic expansion valve keeps the original opening state, acquiring the return air temperature and the return air pressure of the current compressor again, and continuously controlling the opening of the auxiliary electronic expansion valve according to the re-acquired return air temperature and evaporation temperature.
Therefore, the air conditioner is in a continuous running state, so that a compressor in the air conditioner is also in a continuous working state, the return pressure and the return temperature on a return air pipeline of the compressor also need to be continuously obtained in real time, and the return air superheat degree on the return air pipeline is prevented from being overlarge.
Further, controlling the opening degree of the auxiliary electronic expansion valve according to the return air temperature and the evaporation temperature, further comprising: when the opening degree of the auxiliary electronic expansion valve is increased by M steps for a first preset time, continuously acquiring the return air temperature and the return air pressure of the current compressor;
when the difference value between the return air temperature and the evaporation temperature which are continuously obtained is larger than or equal to A, the auxiliary electronic expansion valve continuously increases by M steps in the original opening state; until the difference between the return air temperature and the evaporation temperature obtained continuously is less than A.
Therefore, the degree of superheat of the return air on the return air pipeline of the compressor is large, the opening degree of the auxiliary electronic expansion valve is set, although the opening degree is set, the reduction of the degree of superheat on the return air pipeline of the compressor is not necessarily guaranteed, if the difference between the obtained return air temperature and the evaporation temperature is still larger than or equal to 1, the degree of superheat of the return air on the return air pipeline of the compressor is still too large, the opening degree of the electronic expansion valve is continuously controlled, the opening degree of the electronic expansion valve is not adjusted until the difference between the return air temperature Ti and the evaporation pressure is smaller than 1, and the step that the difference between the return air temperature Ti and the evaporation temperature is smaller than 1 is continuously executed. Thereby ensuring that the superheat degree on the air return pipeline is in a reasonable state and ensuring that the air conditioner operation environment is in a reasonable state.
Further, when the auxiliary electronic expansion valve maintains the original opening state, re-acquiring the return air temperature and the return air pressure of the current compressor, and continuing to control the opening of the auxiliary electronic expansion valve according to the re-acquired return air temperature and the re-acquired evaporation temperature, the method includes:
when the difference value between the re-acquired return air temperature and the evaporation temperature is greater than or equal to B, controlling the auxiliary electronic expansion valve to keep the opening state at the moment, and continuously acquiring the return air temperature and the return air pressure of the compressor;
and when the difference value between the return air temperature and the evaporation temperature is less than B, closing the auxiliary electronic expansion valve by N steps.
Therefore, the return air superheat degree of the compressor is smaller than B, and in this case, the compressor still has a liquid impact phenomenon, which affects the reliability of the compressor. Therefore, whether the difference value between the return air temperature and the evaporation temperature is smaller than B needs to be further judged, if the difference value between the return air temperature and the evaporation temperature is larger than or equal to 0, the return air superheat degree of the compressor is proved to be in a reasonable state, the opening degree of the electronic expansion valve is continuously kept in an original state, and if the difference value between the return air temperature and the evaporation temperature is smaller than 0, the possibility of liquid impact of the compressor is proved, so that the opening degree of the auxiliary electronic expansion valve is controlled, a certain number of steps are closed, and the reliability of the compressor is guaranteed.
Further, after the auxiliary electronic expansion valve is closed for N steps and after a second preset time, the return air temperature and the return air pressure of the compressor are obtained again, and the opening degree of the auxiliary electronic expansion valve is controlled continuously according to the obtained return air temperature and evaporation temperature; until the difference between the return air temperature and the evaporation temperature is less than A and greater than or equal to B.
Therefore, after the auxiliary electronic expansion valve is closed for N steps, in order to prevent the auxiliary electronic expansion valve from being excessively closed, whether the difference value between the return air temperature and the evaporation temperature is less than 1 needs to be judged again, after the conditions are met, whether the difference value between the return air temperature and the evaporation temperature is more than or equal to 0 is judged again, and the difference value between the return air temperature and the evaporation temperature is more than or equal to 0 and less than 1 just by continuously judging and correcting until the opening and closing degree of the auxiliary electronic expansion valve is just larger than or equal to 0, so that the compressor reaches an ideal return air state.
Compared with the prior art, the control method for the return air superheat degree of the air conditioner has the advantages that the control method can effectively control the return air superheat degree of the compressor, so that the output of refrigerating capacity can be guaranteed, the adaptability of the air conditioner environment can be improved, and the energy efficiency of the compressor can be improved.
In order to solve the technical problem, the invention also provides a control device of the air conditioner, which comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the current return air pressure and the return air temperature;
the calculation unit is used for calculating the evaporation temperature according to the return air pressure;
the calculation unit is also used for calculating the opening value of the auxiliary electronic expansion valve according to the return air pressure and the evaporation temperature;
and the control unit is used for controlling the opening and closing of the auxiliary electronic expansion valve according to the return air pressure and the evaporation temperature.
Therefore, the opening of the auxiliary electronic valve is controlled through the control device, so that the return air superheat degree on the return air pipeline of the compressor is controlled in an ideal state, and the comfort degree of the user using the air conditioner is guaranteed.
Compared with the prior art, the advantages of the control device of the air conditioner are the same as the advantages of the control method of the return air superheat degree of the air conditioner relative to the prior art, and the description is omitted.
In order to solve the technical problem, the present invention further provides an air conditioner, including a computer readable storage medium storing a computer program and a processor, where the computer program is read and executed by the processor to implement the method for controlling the superheat degree of return air of the air conditioner. Therefore, the air conditioner can control the control device to reasonably control the superheat degree of returned air of the compressor, achieve an ideal state and improve the stability of the whole air conditioner.
Further, including compressor, evaporimeter and condenser, still include low pressure sensor and temperature sensor, low pressure sensor with temperature sensor all sets up on the compressor return air pipeline.
From this, through low pressure sensor and the temperature sensor who sets up in addition on the return air pipeline, return air temperature and return air pressure on the acquisition return air pipeline that can accurate try on to, calculate evaporating pressure through the return air pressure, and control opening and shutting of supplementary electronic expansion valve through return air temperature and evaporating pressure, effectual return air superheat degree reasonable control with the compressor is in the within range, and the guarantee user uses.
Furthermore, a throttling capillary tube is further arranged on a pipeline between the evaporator and the condenser, and the auxiliary electronic expansion valve is connected with the throttling capillary tube in parallel.
Therefore, the bypass pipeline is connected in parallel at the throttling capillary tube and is controlled by the auxiliary electronic expansion valve, the throttling capillary tube is not completely replaced by the auxiliary electronic expansion valve, the stability of the system is improved, and the problem that the failure of the auxiliary electronic expansion valve causes the system to be incapable of running and influences the use of a user is avoided.
The other advantages of the air conditioner of the invention relative to the prior art are the same as the advantages of the control method of the return air superheat degree of the air conditioner relative to the prior art, and are not repeated herein.
In order to solve the technical problem, the present invention further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is read and executed by a processor, the method for controlling the superheat degree of returned air of the air conditioner is implemented.
The advantages of the computer-readable storage medium of the present invention over the prior art are the same as the advantages of the defrosting control method of the air conditioner over the prior art, and are not described herein again.
Drawings
FIG. 1 is a first flowchart of a method for controlling the degree of superheat of returned air in an embodiment of the present invention;
FIG. 2 is a second flowchart of the method for controlling the degree of superheat of the returned air according to the embodiment of the present invention;
fig. 3 is a schematic structural diagram of an air conditioner in an embodiment of the present invention.
Description of reference numerals:
1-compressor, 2-condenser, 3-evaporator, 4-throttle capillary tube, 5-auxiliary electronic expansion valve, 11-auxiliary temperature sensor, 12-low pressure temperature sensor.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the description of the present invention, it is to be understood that the description of the term "some specific embodiments" means that a particular feature, structure, material, or characteristic described in connection with the embodiments or examples is included in at least one embodiment or example of the present invention. Throughout this specification, the schematic representations of the terms used above do not necessarily refer to the same implementation or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
As shown in fig. 1 and 2, an embodiment of the present invention provides a method for controlling a superheat degree of return air of an air conditioner, including:
s1, when the air conditioner is started, controlling the auxiliary electronic expansion valve to be in a closed state and setting the opening of the auxiliary electronic expansion valve to be the maximum value;
after the air conditioner is started to operate, in order to ensure that an auxiliary electronic expansion valve of a bypass pipeline at the throttle capillary is in a closed state, the auxiliary electronic expansion valve is operated for 600pls in the valve closing direction, and the opening degree of the electronic expansion valve is 0; in this embodiment, the auxiliary electronic expansion valve is a fully-closed flow-free valve, the maximum opening of the electronic expansion valve is 500pls, and the auxiliary electronic expansion valve is operated for 600pls in the valve closing direction before starting up each time to ensure that the auxiliary electronic expansion valve is in a closed state, and the opening of the electronic expansion valve is 0; in order to ensure that the electronic expansion valve is fully closed, the electronic expansion valve opening is therefore set to 600 pls.
S2, when the air conditioner is stable in operation, acquiring the return air temperature Ti and the return air pressure Pi of the current compressor;
starting to acquire the return air temperature Ti and the return air pressure Pi of the current compressor after the air conditioner is started for one hour; because the system operation is still unstable in one hour after the fixed-frequency air conditioner is started, especially in the first ten minutes after the air conditioner is started, the return air superheat degree is large, at the moment, the control of the auxiliary electronic expansion valve has no substantial significance, and the time for the system to be stably adjusted is increased.
S3, calculating the current evaporation temperature Te according to the return air pressure Pi; and calculating the current evaporation temperature Te through the return air pressure Pi acquired in real time. Since the calculation method for calculating the evaporating temperature Te through the return air pressure Pi is a common calculation method, the evaporating temperature Te can be calculated through any conventional calculation method in the embodiment.
And S4, controlling the opening degree of the auxiliary electronic expansion valve according to the return air temperature Ti and the evaporation temperature Te.
The evaporating temperature Te is determined by the corresponding relation between the pressure and the temperature of the refrigerant through the air return pressure Pi, the z evaporating temperature Te needs to be repeatedly compared and calibrated with the air return temperature Ti until the difference value between the air return temperature Ti and the evaporating temperature Te is less than 1 when the value is less than or equal to 0, the air return temperature Te is in a dynamic balance range, and an ideal air return state is achieved.
In order to control the return air superheat degree of the fixed-frequency air conditioner, so as to improve the energy consumption, the refrigerating capacity and the environmental adaptability of the air conditioner, the embodiment adopts a return air control mode to control the return air superheat degree, so that the capacity, the energy efficiency and the environmental adaptability of the fixed-frequency air conditioner are improved.
Some embodiments of the present invention control the opening degree of the auxiliary electronic expansion valve according to the return air temperature Ti and the evaporation temperature Te, including:
s41, when the difference between the return air temperature Ti and the evaporation temperature Te is less than A, the auxiliary electronic expansion valve keeps the original opening state; and after the auxiliary electronic expansion valve keeps the original opening state, continuously acquiring the return air temperature Ti and the return air pressure Pi of the current compressor, and continuously controlling the opening of the auxiliary electronic expansion valve according to the return air temperature Ti and the evaporation temperature Te. Preferably, the value of A is 1, and when the value of A is 1, the return air superheat degree of the compressor can be controlled within a reasonable range; the superheat degree of the return air is too large, the refrigerant is evaporated completely in the evaporator too early, and the maximum heat exchange effect of the evaporator is not exerted. The return air superheat degree is too small, and the compressor liquid impact phenomenon influences the running reliability of the compressor.
Because the air conditioner is in a continuous running state, a compressor in the air conditioner is also in a continuous working state, so that the return air pressure Pi and the return air temperature Ti on the return air pipeline of the compressor also need to be continuously obtained in real time, and the return air superheat degree on the return air pipeline is prevented from being overlarge.
And S42, when the difference value between the continuously acquired return air temperature Ti and the evaporation temperature Te is larger than or equal to A, increasing the auxiliary electronic expansion valve by M steps in the original opening state. After the auxiliary electronic expansion valve is opened for M steps for a first preset time, the range of M is as follows: 2-4, preferably, M is 2. The range of the first preset time is 50-70s, preferably, the first preset time is 60s, after the auxiliary electronic expansion valve is opened for 2 steps, after 60s, the air conditioner is enough to adapt to the current opening, the return air temperature Ti and the return air pressure Pi of the current compressor are continuously obtained, and whether the superheat degree of the compressor is in a reasonable range or not can be obtained; and when the difference value between the return air temperature Ti and the evaporation temperature Te is more than or equal to 1, the auxiliary electronic expansion valve continues to increase by M steps in the original opening state until the difference value between the return air temperature Ti and the evaporation temperature Te is less than 1.
Because the degree of superheat of the return air in the return air pipe of the compressor is large, the opening degree of the auxiliary electronic expansion valve is set, and although the opening degree of the auxiliary electronic expansion valve is set, the reduction of the degree of superheat of the return air pipe of the compressor is not necessarily guaranteed, if the difference between the obtained return air temperature Ti and the evaporation temperature Te is still larger than or equal to 1, the obtained return air degree of superheat of the return air pipe of the compressor is still too large, the opening degree of the electronic expansion valve is continuously controlled, the opening degree of the electronic expansion valve is not adjusted until the difference between the return air temperature Ti and the evaporation pressure is smaller than 1, and the step that the difference between the return air temperature Ti and the evaporation temperature Te is smaller than 1 is continuously executed. Thereby ensuring that the superheat degree on the air return pipeline is in a reasonable state and ensuring that the air conditioner operation environment is in a reasonable state.
Therefore, the difference value of the return air temperature Ti and the evaporation temperature Te is judged firstly, the auxiliary electronic expansion valve is controlled through the judgment of the magnitude value of the difference value, when the difference value of the return air temperature Ti and the evaporation temperature Te is less than 1, the superheat degree of the return air on a return air pipeline of the compressor is in a reasonable state, and the original opening state of the auxiliary electronic expansion valve can be kept; if the difference between the return air temperature Ti and the evaporation temperature Te is more than or equal to 1, the superheat degree of the return air on the return air pipeline of the compressor is overlarge, and the superheat degree of the return air is reduced by controlling the opening degree of the auxiliary electronic expansion valve.
In some embodiments of the present invention, after the auxiliary electronic expansion valve maintains the original opening state, the method continues to obtain the return air temperature Ti and the return air pressure Pi of the current compressor, and continues to control the opening of the auxiliary electronic expansion valve according to the return air temperature Ti and the evaporation temperature Te, including:
s411, when the difference value between the continuously acquired return air temperature Ti and the evaporating temperature Te is larger than or equal to B, the auxiliary electronic expansion valve keeps the opening state at the moment, and the return air temperature Ti and the return air pressure Pi of the compressor are continuously acquired; and (4) indicating that the return air superheat degree reaches an ideal state, maintaining the state of the auxiliary electronic expansion valve, and continuously monitoring state parameters such as return air temperature Ti, return air pressure Pi and the like. Preferably, the value of B is 0, and when the value of B is 0, the superheat degree of return air of the compressor can be controlled within a reasonable range; the superheat degree of the return air is too large, the refrigerant is evaporated completely in the evaporator too early, and the maximum heat exchange effect of the evaporator is not exerted. The return air superheat degree is too small, and the compressor liquid impact phenomenon influences the running reliability of the compressor.
And S412, when the difference value between the return air temperature Ti and the evaporation temperature Te is less than 0, closing the electronic expansion valve in the auxiliary N step. After the auxiliary electronic expansion valve is closed by N steps, the range of N is as follows: 2-4, preferably N is 2. After the second preset time, continuously acquiring the return air temperature Ti and the return air pressure Pi of the compressor; the range of the second preset time is 50-70s, preferably 60s, after the auxiliary electronic expansion valve is closed for 2 steps, after 60s, the air conditioner is enough to adapt to the current opening degree, the return air temperature Ti and the return air pressure Pi of the current compressor are continuously obtained, and whether the superheat degree of the compressor is in a reasonable range can be obtained; and controlling the opening degree of the auxiliary electronic expansion valve according to the return air temperature Ti and the return air pressure Pi until the difference value of the return air temperature Ti and the evaporation temperature Te is less than A and greater than or equal to B.
In the case where the degree of superheat of the returned air in the compressor is less than 0, the compressor still suffers from liquid slugging, which affects the reliability of the compressor. Therefore, whether the difference value between the return air temperature Ti and the evaporation temperature Te is less than 0 needs to be further judged, if the difference value between the return air temperature Ti and the evaporation temperature Te is greater than or equal to 0, the return air superheat degree of the compressor is proved to be in a reasonable state, the opening degree of the electronic expansion valve is continuously kept in an original state, and if the difference value between the return air temperature Ti and the evaporation temperature Te is less than 0, the possibility of liquid impact of the compressor is proved, so that the opening degree of the auxiliary electronic expansion valve is controlled, a certain number of steps are closed, and the reliability of the compressor is guaranteed.
After the auxiliary electronic expansion valve is closed for N steps, in order to prevent the auxiliary electronic expansion valve from being excessively closed, whether the difference value between the return air temperature Ti and the evaporation temperature Te is less than 1 needs to be judged again, after the conditions are met, whether the difference value between the return air temperature Ti and the evaporation temperature Te is more than or equal to 0 needs to be judged again, and the difference value between the return air temperature Ti and the evaporation temperature Te is more than or equal to 0 and less than 1 just by continuous judgment and correction until the opening and closing degree of the auxiliary electronic expansion valve is just enabled to be more than or equal to 0, so that the compressor achieves an ideal. In addition, the embodiment has the advantages that the adjusting amplitude of the auxiliary electronic expansion valve is small through the continuous correction and adjustment of the control system, and the superheat degree of return air is controlled to be 0-1 ℃.
Another embodiment of the present invention provides a control apparatus of an air conditioner, including:
an acquisition unit for acquiring a current return air pressure Pi and a return air temperature Ti;
the calculation unit is used for calculating the evaporation temperature Te according to the return air pressure Pi;
the calculating unit is also used for calculating the opening value of the auxiliary electronic expansion valve according to the return air pressure Pi and the evaporation temperature Te;
and the control unit is used for controlling the opening and closing of the auxiliary electronic expansion valve according to the air return pressure Pi and the evaporation temperature Te.
Compared with the prior art, the advantages of the control device of the air conditioner are the same as the advantages of the control method of the return air superheat degree of the air conditioner relative to the prior art, and the description is omitted.
As shown in fig. 3, another embodiment of the present invention further provides an air conditioner, which includes a computer readable storage medium storing a computer program and a processor, wherein the computer program is read by the processor and executed to implement the method for controlling the superheat degree of return air of the air conditioner. Therefore, the air conditioner can control the control device to reasonably control the superheat degree of returned air of the compressor, achieve an ideal state and improve the stability of the whole air conditioner.
Preferably, the air conditioner comprises a compressor 1, an evaporator 3 and a condenser 2, and further comprises a low pressure sensor 12 and a temperature sensor 11, wherein the low pressure sensor 12 and the temperature sensor 11 are both arranged on a return air pipeline of the compressor 1. Through low pressure sensor 12 and the temperature sensor 11 that set up in addition on the return air pipeline, return air temperature Ti and return air pressure Pi on the acquisition return air pipeline that can accurate try to, calculate evaporating pressure through return air pressure Pi to control opening and shutting of supplementary electronic expansion valve through return air temperature Ti and evaporating pressure, effectual return air superheat degree reasonable control with the compressor is in the scope, and the guarantee user uses.
A throttle capillary tube 4 is also arranged on a pipeline between the evaporator 3 and the condenser 2, and an auxiliary electronic expansion valve 5 is connected with the throttle capillary tube 4 in parallel. The auxiliary electronic expansion valve 5 consists of a coil and a valve body, and the coil sends pulses to drive a valve needle in the valve body to open and close.
In the embodiment, a bypass pipeline is connected in parallel at the throttling capillary tube 4 and is controlled by the auxiliary electronic expansion valve 5, the throttling capillary tube 4 is not completely replaced by the auxiliary electronic expansion valve, the stability of the system is improved, and the problem that the failure of the auxiliary electronic expansion valve causes the system to be incapable of running and affects the use of a user is prevented; and the return air temperature Ti is controlled within the range of 0-1 ℃ by controlling the auxiliary electronic expansion valve, so that the capacity, the energy efficiency and the environmental adaptability of the air conditioner are improved.
Other advantages of the air conditioner of the invention relative to the prior art are the same as the advantages of the air conditioner return air superheat degree relative to the prior art, and are not described herein again.
The invention also provides a computer readable storage medium, which stores a computer program, and when the computer program is read and executed by a processor, the control method for the return air superheat degree of the air conditioner is realized.
The advantages of the computer readable storage medium in this embodiment over the prior art are the same as the advantages of the control method for the superheat degree of the returned air of the air conditioner over the prior art, and are not described herein again.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (11)
1. A control method for the superheat degree of return air of an air conditioner is characterized by comprising the following steps:
when the air conditioner is started, controlling an auxiliary electronic expansion valve (5) to be in a closed state and setting the opening degree of the auxiliary electronic expansion valve (5) to be the maximum value;
when the air conditioner operates stably, acquiring the return air temperature and the return air pressure of the current compressor (1);
calculating the current evaporation temperature according to the return air pressure;
and controlling the opening degree (5) of the auxiliary electronic expansion valve according to the return air temperature and the evaporation temperature.
2. The method for controlling the degree of superheat of return air of an air conditioner as claimed in claim 1, wherein controlling the opening degree of said auxiliary electronic expansion valve (5) based on said return air temperature and said evaporation temperature comprises:
when the difference value between the return air temperature and the evaporation temperature is smaller than A, controlling the auxiliary electronic expansion valve (5) to keep an original opening state;
and when the difference value between the return air temperature and the evaporation temperature is greater than or equal to A, controlling the auxiliary electronic expansion valve (5) to increase by M steps in the original opening state.
3. The method for controlling the degree of superheat of return air of an air conditioner as claimed in claim 2, wherein the opening degree of said auxiliary electronic expansion valve (5) is controlled based on said return air temperature and said evaporation temperature, further comprising:
and when the auxiliary electronic expansion valve (5) keeps the original opening state, acquiring the return air temperature and the return air pressure of the current compressor again, and continuously controlling the opening of the auxiliary electronic expansion valve (5) according to the re-acquired return air temperature and evaporation temperature.
4. The method for controlling the degree of superheat of return air of an air conditioner as claimed in claim 2, wherein the opening degree of said auxiliary electronic expansion valve (5) is controlled based on said return air temperature and said evaporation temperature, further comprising:
when the opening degree of the auxiliary electronic expansion valve is increased by M steps for a first preset time, continuously acquiring the return air temperature and the return air pressure of the current compressor;
and when the difference value between the return air temperature and the evaporation temperature which are continuously acquired is greater than or equal to A, controlling the auxiliary electronic expansion valve to continuously increase by M steps in the original opening state until the difference value between the return air temperature and the evaporation temperature which are continuously acquired is less than A.
5. The method for controlling the degree of superheat of return air of an air conditioner as claimed in claim 3 or 4, wherein reacquiring the current return air temperature and return air pressure of the compressor while the auxiliary electronic expansion valve is maintained in the original opening state, and continuing to control the opening degree of the auxiliary electronic expansion valve based on the reacquired return air temperature and evaporation temperature comprises:
when the difference value between the re-acquired return air temperature and the evaporation temperature is greater than or equal to B, controlling the auxiliary electronic expansion valve to keep the opening at the moment, and continuously acquiring the return air temperature and the return air pressure of the compressor;
and when the difference value between the return air temperature and the evaporation temperature is less than B, controlling the auxiliary electronic expansion valve to close N steps.
6. The method for controlling the degree of superheat of return air of an air conditioner as claimed in claim 5, wherein after the auxiliary electronic expansion valve is turned off by N steps, after a second predetermined time, the return air temperature and the return air pressure of the compressor are acquired again, and the opening degree of the auxiliary electronic expansion valve is continuously controlled based on the acquired return air temperature and evaporation temperature; until the difference between the return air temperature and the evaporation temperature is less than A and greater than or equal to B.
7. A control apparatus of an air conditioner, comprising:
the acquisition unit is used for acquiring the current return air pressure and the return air temperature;
the calculation unit is used for calculating the evaporation temperature according to the return air pressure;
the calculation unit is also used for calculating the opening value of the auxiliary electronic expansion valve (5) according to the return air pressure and the evaporation temperature;
and the control unit is used for controlling the opening and closing of the auxiliary electronic expansion valve (5) according to the return air pressure and the evaporation temperature.
8. An air conditioner comprising a computer-readable storage medium storing a computer program and a processor, wherein the computer program is read by the processor and executed to implement the method for controlling the degree of superheat of return air of the air conditioner according to any one of claims 1 to 6.
9. Air conditioner according to claim 8, comprising a compressor (1), an evaporator (3) and a condenser (2), characterized in that it further comprises a low pressure sensor (12) and an auxiliary temperature sensor (11), said low pressure sensor (12) and said auxiliary temperature sensor (12) being arranged on the return line of said compressor (1).
10. The air conditioner according to claim 9, characterized in that a throttle capillary tube (4) is further provided in the piping between the evaporator (3) and the condenser (2), and the auxiliary electronic expansion valve (5) is connected in parallel with the throttle capillary tube (4).
11. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the method for controlling the degree of superheat of return air of an air conditioner according to any one of claims 1 to 6.
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