CN114234411A - Torque calculation method of compressor and air conditioner with same - Google Patents
Torque calculation method of compressor and air conditioner with same Download PDFInfo
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- CN114234411A CN114234411A CN202111575440.6A CN202111575440A CN114234411A CN 114234411 A CN114234411 A CN 114234411A CN 202111575440 A CN202111575440 A CN 202111575440A CN 114234411 A CN114234411 A CN 114234411A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
- F24F2013/247—Active noise-suppression
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Signal Processing (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a torque calculation method of a compressor and an air conditioner with the same, wherein the torque calculation method of the compressor is characterized in that: the method comprises the following steps: a detection step of detecting the discharge pressure and the suction pressure of the compressor; or detecting the condensation temperature of the condenser and the evaporation temperature of the evaporator; calculating, namely calculating or directly obtaining the discharge pressure and the suction pressure of the compressor; an acquisition step of acquiring a pneumatic load M ═ f (P) in a pump body of the compressorc,Psθ); the compressor pneumatic load M is as follows:
according to the invention, can obtainAnd the load details in the running process of the compressor can be used for carrying out accurate rotating speed compensation according to the load details, carrying out torque compensation control on the obtained load and providing reference for the torque compensation control, so that the problems of vibration, vibration noise, pipeline failure and the like of the compressor are reduced.
Description
Technical Field
The invention relates to the technical field of compressors, in particular to a torque calculation method of a compressor and an air conditioner with the same.
Background
The existing air conditioner control technology generally controls the operation of a compressor through the feedback adjustment of the rotating speed of the compressor, but because the rotating speed of the compressor is higher, the compensation amount of feedforward or feedback compensation of the rotating speed does not have a reasonable reference, so that larger compensation deviation can be generated, the rotating speed fluctuation in the operation process of the compressor is larger, and the problems of vibration noise, pipeline failure and the like are caused.
The invention provides a torque calculation method of a compressor and an air conditioner with the same, which are researched and designed by the invention because the rotating speed of the compressor in the prior art is higher, and the compensation amount of feed-forward or feed-back compensation of the rotating speed is unreasonable, so that larger compensation deviation can be generated, the rotating speed fluctuation in the operation process of the compressor is larger, and the technical problems of vibration noise, pipeline failure and the like are caused.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defect that the compensation amount of the feed-forward or feed-back compensation of the rotation speed of the compressor in the prior art is not reasonable, which results in a large compensation deviation, and the rotation speed fluctuation is large in the operation process of the compressor, thereby providing a torque calculation method of the compressor and an air conditioner having the same.
In order to solve the above problems, the present invention provides a torque calculation method of a compressor, including:
a detection step of detecting the discharge pressure and the suction pressure of the compressor; or detecting the condensation temperature of the condenser and the evaporation temperature of the evaporator;
calculating, namely calculating or directly obtaining the discharge pressure and the suction pressure of the compressor;
an acquisition step of acquiring gas in a pump body of a compressorDynamic load M ═ f (P)c,Ps,θ)；
The compressor pneumatic load M is as follows:
where r is the rotor radius, e is the rotor eccentricity, l is the pump height, θ is the pump angular position, PcIs the exhaust pressure, PsIs the suction pressure.
In some embodiments, θ is a function of rotor rotation ω and time, and θ (t) is ω (t).
In some embodiments, Pc＝F(Tc)，Ps＝F(Ts)；
M＝F(F(Tc),F(Ts),θ(t))；
Wherein T iscIs the temperature of the evaporator bulb, TsIs the condenser bulb temperature.
In some embodiments, the function of f (t) is given in the form of a polynomial, and the internal/external units may have different function compositions when using different types of refrigerants, as follows:
an outer machine: p is A0+A1*T+A2*T2+A3*T3；
An internal machine: p ═ B0+B1*T+B2*T2+B3*T3；
Wherein p is the pressure of the air suction and exhaust pipe, T is the temperature measured by the inner machine and outer machine temperature sensing packages, the coefficient Ai is the coefficient of the outer machine temperature-pressure polynomial, and Bi is the coefficient of the inner machine temperature-pressure polynomial, wherein i is 0-3.
In some embodiments, a frequency spectrum of the load is obtained by fourier analysis of the load, and the load is recombined using a plurality of sinusoidal functions according to frequency components and corresponding amplitudes and phases of the frequency components on the load frequency spectrum.
In some embodiments, the fourier analyzed load includes a real part real _ M and an imaginary part imag _ M, and the amplitude amp _ T and the phase Phai _ T at the corresponding frequency are obtained according to the real part and the imaginary part thereof, and the specific reconstruction method is as follows:
in some embodiments, the final reconstructed load M _ rebuilt is:
wherein
f is the corresponding harmonic frequency in the spectral analysis.
In some embodiments, real-time matching of load phases is achieved by matching the corresponding rotor spatial and electrical angles at load maxima.
The invention also provides an air conditioner, which comprises a compressor, wherein the compressor is subjected to torque calculation by using the torque calculation method.
In some embodiments, the compressor is a single rotor compressor.
The torque calculation method of the compressor and the air conditioner with the same have the following beneficial effects:
the invention obtains the discharge pressure and the suction pressure of the compressor by calculation or directly; an acquisition step of acquiring a pneumatic load M ═ f (P) in a pump body of the compressorc,Psθ), and the compressor aerodynamic load M is as follows:
the load details in the operation process of the compressor can be obtained, accurate rotating speed compensation can be carried out according to the load details, torque compensation control is carried out on the obtained load, and the temperature or the pressure of a refrigerant in the operation process of the air conditioner is controlled through the temperature or the pressure of the refrigerant under the condition that the structure and the components of the air conditioner are not changedThe force changes, the internal load of the compressor is obtained, and a reference is provided for torque compensation control, so that the problems of vibration, vibration noise, pipeline failure and the like of the compressor are reduced.
Drawings
FIG. 1 is a schematic view of the two-device flow path expansion and temperature sensing device of the present invention;
FIG. 2 is a graph of the load (mechanical angle versus load amplitude) during one cycle of the present invention;
FIG. 3 is a load spectrum within 160Hz of the present invention;
FIG. 4 is a graph of reconstructed load versus theoretical calculated load for the present invention.
The reference numerals are represented as:
1. a first flow path inlet/outlet; 2. a first flow path outlet/inlet; 3. a first flow path middle bit; 4. a second flow path inlet/outlet; 5. a second flow path outlet/inlet; 6. a second flow path middle bit; 7. condenser/evaporator.
Detailed Description
As shown in fig. 1 to 4, the present invention provides a torque calculation method of a compressor, which includes:
a detection step of detecting the discharge pressure and the suction pressure of the compressor; or detecting the condensation temperature of the condenser and the evaporation temperature of the evaporator;
calculating, namely calculating or directly obtaining the discharge pressure and the suction pressure of the compressor;
an acquisition step of acquiring a pneumatic load M ═ f (P) in a pump body of the compressorc,Ps,θ)；
The compressor pneumatic load M is as follows:
where r is the rotor radius, e is the rotor eccentricity, l is the pump height, θ is the pump angular position, PcIs the exhaust pressure, PsIs the suction pressure.
The invention obtains the compressor by calculation or directlyDischarge pressure and suction pressure; an acquisition step of acquiring a pneumatic load M ═ f (P) in a pump body of the compressorc,Psθ), and the compressor aerodynamic load M is as follows:
the load details in the operation process of the compressor can be obtained, accurate rotating speed compensation can be carried out according to the load details, the internal load of the compressor is obtained through the temperature or pressure change of a refrigerant in the operation process of the air conditioner under the condition that the structure and the components of the air conditioner are not changed for carrying out torque compensation control on the obtained load, reference is provided for the torque compensation control, and therefore the problems of vibration, vibration noise, pipeline failure and the like of the compressor are reduced.
The invention firstly solves the problem of driving torque input during compressor driving control after acquiring the load torque, and when the amplitude and the phase of the driving torque and the load are well matched, the vibration of the compressor can be very small, thereby reducing the vibration of a pipeline.
In some embodiments of the present invention, the substrate is,
θ is a function of rotor rotation ω and time, and θ (t) is ω (t).
In some embodiments of the present invention, the substrate is,
Pc＝F(Tc)，Ps＝F(Ts)；
M＝F(F(Tc),F(Ts),θ(t))；
the suction and exhaust pressure of the compressor is a function of the saturated steam temperature of the refrigerant, so that the suction and exhaust pressure of the compressor (formula 1) can be calculated back through the saturated steam temperature, and further, the pneumatic load in the pump body (formula 3) can be obtained through the temperature sensing bulb temperature on the evaporator/condenser by substituting the formula (1) into the formula (2).
Pc＝F(Tc)，Ps＝F(Ts) (1)；
M＝F(Pc,Ps,θ) (2)；
M＝F(F(Tc),F(Ts),θ(t)) (3)。
Wherein T iscIs the temperature of the evaporator bulb, TsIs the condenser bulb temperature.
In some embodiments of the present invention, the substrate is,
the function of f (t) is given in the form of a polynomial, and different function compositions can be found for the internal/external units using different types of refrigerants, as follows:
an outer machine: p is A0+A1*T+A2*T2+A3*T3； (5)
An internal machine: p ═ B0+B1*T+B2*T2+B3*T3； (6)
Wherein p is the pressure of the air suction and exhaust pipe, T is the temperature measured by the inner machine and outer machine temperature sensing packages, the coefficient Ai is the coefficient of the outer machine temperature-pressure polynomial, and Bi is the coefficient of the inner machine temperature-pressure polynomial, wherein i is 0-3.
The temperature of different positions of the temperature sensing bulbs on the two devices is measured, so that different pressure-temperature curves, namely different pressure-temperature functions (5) and (6), can be obtained, and the functions are brought into a load-pressure relation, so that the internal load of the pump body can be obtained.
The temperature is measured in different flow paths of the two devices, temperature and pressure functions at different flow paths are established, the most suitable temperature-sensing bulb installation position is determined, and then the temperature- > pressure- > load function at the best measurement point is written into the control board, so that real-time load is generated.
In some embodiments of the present invention, the substrate is,
and obtaining the frequency spectrum of the obtained load through Fourier analysis of the load, and recombining the load by adopting a plurality of sine functions according to the frequency components on the load frequency spectrum and the corresponding amplitude and phase thereof.
In some embodiments, the present invention can realize real-time acquisition of the compressor load by acquiring the temperature of the inner and outer thermal bulb and adding a temperature input interface in the control module (as shown in fig. 2); the mechanical angle and the electrical angle of the load are matched through the mechanical angle and the electrical angle of the load extreme point, so that the mechanical angle and the electrical angle of the load are corresponding; further, by performing fourier analysis on the real load, a spectrum (shown in fig. 3) of the real load is obtained, where the load after fourier analysis includes a real part (real _ M) and an imaginary part imag _ M, and according to the real part and the imaginary part of the load, an amplitude (amp _ T) and a phase (phase _ T) at a corresponding frequency can be obtained, and a specific reconstruction method is as follows formula (4):
the load after Fourier analysis comprises a real part real _ M and an imaginary part imag _ M, and the amplitude amp _ T and the phase Phai _ T under the corresponding frequency are obtained according to the real part imaginary part of the load, wherein the specific reconstruction method comprises the following formula:
in some embodiments of the present invention, the substrate is,
the final reconstructed load M _ rebuilt is:
wherein
f is the corresponding harmonic frequency in the spectral analysis, and the comparison of the final reconstructed load and the theoretical load is shown in fig. 4.
In the drive control of the single-rotor motor, the prior art reorganizes the load through the fourier analysis of the load, and the conventional drive square waveform includes a triangular wave, a sine wave and a square wave, but the prior art formulates the drive waveform through the fourier analysis of the load. The conventional sinusoidal waveform described above is typically obtained by PI regulatory feedback debugging, and is also not fourier analyzed.
In some embodiments, real-time matching of load phases is achieved by matching the corresponding rotor spatial and electrical angles at load maxima. The electric angle is determined according to the specific point of the driving current, the rotor of the motor has multi-phase currents, the space angle between each phase of the currents is constant, but the magnitude of each current can be regulated. When the motor runs, a rotating speed sensor is arranged on the motor, when position matching is carried out, a rotating speed target is firstly given to the motor, the current magnitude is detected, when the driving current is maximum, the position is the maximum load position, the later position can be obtained in real time by taking the maximum load position as a reference through integral of rotating speed and time, and after the position is obtained, each position has a corresponding load amplitude, so that real-time matching of load amplitude phase and driving is realized, and the moment balance of the motor is optimal.
The invention also provides an air conditioner, which comprises a compressor, wherein the compressor is subjected to torque calculation by using the torque calculation method.
The invention is characterized in that: the internal load of the compressor can be obtained only by the temperature sensing bulbs of the evaporator and the condenser without additionally increasing the structural components of the air conditioner.
And the real-time matching of the load phase is realized through the matching of the rotor space angle and the electrical angle corresponding to the maximum value of the load.
The frequency spectrum of the obtained load is obtained through Fourier analysis, and the load can be recombined by a plurality of sine functions according to the frequency components on the load frequency spectrum and the corresponding amplitude and phase thereof, so that the load is easier to apply.
In some embodiments, the compressor is a single rotor compressor.
According to the thermodynamic characteristics of the refrigerant in the refrigeration/heat cycle process, the saturated vapor pressure and the corresponding saturated vapor temperature have corresponding functional relation. The invention obtains the evaporating temperature and the condensing temperature through the temperature sensing bags on the evaporator and the condenser, then obtains the air suction and exhaust pressure according to the functional relation between the evaporating temperature and the condensing temperature and further obtains the pneumatic load according to the functional relation between the pneumatic load and the air suction and exhaust pressure. Correspondingly, in order to use the obtained load for torque compensation control, a temperature reading interface is arranged on the control board to read the temperature of the evaporator and the condenser temperature sensing bulb.
Specifically, 1. the temperature of the position where the thermal bulb is located is obtained: in order to achieve rapid heat dissipation and uniform heat distribution on the components in the flowing process of the refrigerant, the air conditioner evaporator and the condenser are generally designed into a multi-flow-path synchronous evaporation or condensation mode, and the selection of the position of the temperature sensing package influences the construction of the relationship between the suction/exhaust pressure and the evaporation/condensation temperature. The specific positions include the outlet of the evaporator and the middle position of each branch flow path of the evaporator (the position can be selected to be 1), and the inlet of the condenser and the middle position of each branch flow path of the condenser (the position can be selected to be 1).
2. The temperature data is transmitted to a controller, and the pneumatic load is calculated in the controller through a constructed load calculation formula (formula 3).
3. According to the relationship (formula 2) between the pneumatic load and the suction/exhaust pressure and the angular displacement of the rotor, the pneumatic load can be obtained. The rotor angular displacement and the position of the compressor rotor in the rotating process are in a fixed corresponding relation, and when theta is taken as a value within the range of 0-2 pi, the pneumatic load (shown in figure 2) of the compressor corresponding to different rotor angular displacements under the condition of the temperature of the evaporator/condenser temperature sensing bulb can be obtained.
4. And carrying out Fourier analysis on the generated load to obtain the frequency spectrum component of the load, and then carrying out load reconstruction.
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. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A torque calculation method of a compressor, characterized in that: the method comprises the following steps:
a detection step of detecting the discharge pressure and the suction pressure of the compressor; or detecting the condensation temperature of the condenser and the evaporation temperature of the evaporator;
calculating, namely calculating or directly obtaining the discharge pressure and the suction pressure of the compressor;
an acquisition step of acquiring a compressionPneumatic load M ═ f (P) in the pump body of the machinec,Ps,θ)；
The compressor pneumatic load M is as follows:
where r is the rotor radius, e is the rotor eccentricity, l is the pump height, θ is the pump angular position, PcIs the exhaust pressure, PsIs the suction pressure.
2. The torque calculation method according to claim 1, characterized in that:
θ is a function of rotor rotation ω and time, and θ (t) is ω (t).
3. The torque calculation method according to claim 2, characterized in that:
Pc＝F(Tc)，Ps＝F(Ts)；
M＝F(F(Tc),F(Ts),θ(t))；
wherein T iscIs the temperature of the evaporator bulb, TsIs the condenser bulb temperature.
4. The torque calculation method according to claim 3, characterized in that:
the function of f (t) is given in the form of a polynomial, and different function compositions can be found for the internal/external units using different types of refrigerants, as follows:
an outer machine: p is A0+A1*T+A2*T2+A3*T3；
An internal machine: p ═ B0+B1*T+B2*T2+B3*T3；
Wherein p is the pressure of the air suction and exhaust pipe, T is the temperature measured by the inner machine and outer machine temperature sensing packages, the coefficient Ai is the coefficient of the outer machine temperature-pressure polynomial, and Bi is the coefficient of the inner machine temperature-pressure polynomial, wherein i is 0-3.
5. The torque calculation method according to any one of claims 1 to 4, characterized in that:
and obtaining the frequency spectrum of the obtained load through Fourier analysis of the load, and recombining the load by adopting a plurality of sine functions according to the frequency components on the load frequency spectrum and the corresponding amplitude and phase thereof.
6. The torque calculation method according to claim 5, characterized in that:
the load after Fourier analysis comprises a real part real _ M and an imaginary part imag _ M, and the amplitude amp _ T and the phase Phai _ T under the corresponding frequency are obtained according to the real part imaginary part of the load, wherein the specific reconstruction method comprises the following formula:
7. the torque calculation method according to claim 6, characterized in that:
the final reconstructed load M _ rebuilt is:
wherein
f is the corresponding harmonic frequency in the spectral analysis.
8. The torque calculation method according to any one of claims 1 to 7, characterized in that:
and the real-time matching of the load phase is realized through the matching of the rotor space angle and the electrical angle corresponding to the maximum value of the load.
9. An air conditioner, includes the compressor, its characterized in that: performing a torque calculation on a compressor using the torque calculation method according to any one of claims 1 to 8.
10. The air conditioner according to claim 9, wherein:
the compressor is a single rotor compressor.
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