CN118391746A - Air conditioner outdoor unit and air conditioner - Google Patents
Air conditioner outdoor unit and air conditioner Download PDFInfo
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- CN118391746A CN118391746A CN202310178423.1A CN202310178423A CN118391746A CN 118391746 A CN118391746 A CN 118391746A CN 202310178423 A CN202310178423 A CN 202310178423A CN 118391746 A CN118391746 A CN 118391746A
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- 241000521257 Hydrops Species 0.000 claims abstract description 123
- 206010030113 Oedema Diseases 0.000 claims abstract description 123
- 238000009833 condensation Methods 0.000 claims abstract description 46
- 230000005494 condensation Effects 0.000 claims abstract description 46
- 230000001276 controlling effect Effects 0.000 claims abstract description 13
- 230000001105 regulatory effect Effects 0.000 claims abstract description 9
- 238000012545 processing Methods 0.000 claims abstract description 6
- 239000003507 refrigerant Substances 0.000 claims description 27
- 239000007788 liquid Substances 0.000 claims description 14
- 238000009825 accumulation Methods 0.000 claims description 10
- 230000010354 integration Effects 0.000 claims description 9
- 238000004781 supercooling Methods 0.000 claims description 9
- 230000004069 differentiation Effects 0.000 claims description 8
- 238000004378 air conditioning Methods 0.000 description 14
- 238000005057 refrigeration Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 238000012356 Product development Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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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Abstract
The invention discloses an air conditioner outdoor unit and an air conditioner, wherein the air conditioner outdoor unit comprises: a housing; a condenser disposed in the housing; a condensing fan; a first pressure sensor for detecting a condensing inlet pressure of the condenser; a second pressure sensor for detecting a condensation outlet pressure of the condenser; a first temperature sensor for detecting a condensation outlet temperature of the condenser; a second temperature sensor for detecting an outdoor temperature; a processing unit configured to: when the preset control conditions are met, the hydrops coefficient is circularly obtained; acquiring a hydrops coefficient deviation based on the acquired hydrops coefficient and a preset coefficient range; taking the deviation of the hydrops coefficient as input, and adopting a PID, PI or PD controller to control and output the rotating speed regulating value of the condensing fan; and updating the rotating speed of the condensing fan according to the rotating speed regulating value, and controlling the condensing fan to operate at the updated rotating speed. The invention can realize the control of the rotation speed of the condensing fan under the maximum energy efficiency point of the system.
Description
Technical Field
The present invention relates to air conditioners, and more particularly, to an air conditioner and an outdoor unit of the air conditioner.
Background
An air conditioner is generally composed of a compressor, an evaporator, a throttle device, a condenser, and a control system. In the refrigeration industry, we would reduce energy consumption, increase energy efficiency by optimizing the matching of the refrigeration system, mining the compressor potential, increasing the efficiency of the condenser, and improving the control logic. The condenser is used as one of the core components of the refrigeration system, and the control mode of the condensing fan, such as the rotating speed, determines the condensing pressure of the system and further determines the energy efficiency of the system, so that the rotating speed control of the condensing fan can influence whether the system can normally and efficiently operate.
In the existing speed control of the condensing fan, for example, in patent CN102466304B, the condensing pressure collected by the pressure sensor, the temperature collected by the temperature sensor or the default parameter value may be used to control the speed of the condensing fan.
In the prior patent CN109210672a, the outdoor temperature is detected in real time through a temperature sensor, then different target high-voltage values of the system are determined, and the rotating speed of the outdoor fan is controlled based on the target high-voltage values, so that the method can realize the operation of the optimal energy efficiency point of the outdoor fan according to the control logic preset by the system, but the scheme has two problems: (1) The setting of the system pressure point depends on the accuracy degree of the test in the development process, and the control deviation can cause the energy efficiency of the system to be reduced; (2) The full-working-condition test wastes a lot of testing time, and affects the product development speed.
The above information disclosed in this background section is only for enhancement of understanding of the background section of the application and therefore it may not form the prior art that is already known to those of ordinary skill in the art.
Disclosure of Invention
Aiming at the problems pointed out in the background art, the invention provides an air conditioner outdoor unit, which is used for controlling the rotating speed of a condensing fan by introducing a hydrops coefficient related to the outdoor temperature and the heat exchange capacity of a condenser so as to realize the operation under the maximum energy efficiency point of the system.
In order to achieve the aim of the invention, the invention is realized by adopting the following technical scheme:
In some embodiments of the present application, there is provided an air conditioner outdoor unit for connecting an air conditioner indoor unit of an air conditioner, including:
A housing;
A condenser disposed in the housing;
a condensing fan disposed in the housing and for driving the air flow to exchange heat with the condenser;
a first pressure sensor for detecting a condensing inlet pressure of the condenser;
a second pressure sensor for detecting a condensation outlet pressure of the condenser;
A first temperature sensor for detecting a condensation outlet temperature of the condenser;
A second temperature sensor for detecting an outdoor temperature;
a processing unit configured to:
When the preset control conditions are met, the hydrops coefficient is circularly obtained;
Acquiring a hydrops coefficient deviation based on the acquired hydrops coefficient and a preset coefficient range;
Taking the deviation of the hydrops coefficient as input, and adopting a PID (proportion integration differentiation), PI (proportion integration differentiation) or PD (potential difference) controller to control and output a rotating speed regulating value of the condensing fan;
Updating the rotating speed of the condensing fan according to the rotating speed adjusting value, and controlling the condensing fan to operate at the updated rotating speed;
wherein the liquid accumulation coefficient is calculated based on the detected condensing inlet pressure, condensing outlet temperature, and outdoor temperature.
The liquid accumulation coefficient is related to the outdoor temperature and the heat exchange capacity of the condenser, and the liquid accumulation coefficient can be used for accurately expressing the heat exchange state of the condensing fan when the energy efficiency of the system is optimal, so that the optimal control of the rotating speed of the condensing fan is realized under the conditions of different outdoor temperatures and different refrigerant filling amounts.
Meanwhile, the condensing fan adopts the hydrops coefficient to control the rotating speed, so that the test under the full working condition can be avoided, the system matching test can be realized quickly, and the product development and debugging time can be reduced.
In some embodiments of the present application, a way of calculating the hydrops coefficient is proposed, which considers the outdoor environment and the heat exchange capacity of the condenser, and thus calculates the hydrops coefficient based on the detected condensing inlet pressure, condensing outlet temperature and outdoor temperature, specifically:
acquiring a condensing temperature based on the detected condensing inlet pressure;
determining a condensation outlet subcooling degree of the condenser based on the condensation outlet pressure and a refrigerant outlet temperature;
calculating a temperature difference between the condensing temperature and the outdoor temperature;
And calculating the quotient between the condensation outlet supercooling degree and the temperature difference as the hydrops coefficient.
In some embodiments of the present application, in order to realize optimal control of the condensation fan by using the effusion coefficient, after the outdoor unit of the air conditioner is started to meet the preset control condition, the effusion coefficient is calculated to meet the preset control condition, which specifically includes:
And in the initial time period of opening the air conditioner outdoor unit, controlling and adjusting the rotating speed of the condensing fan based on the condensing inlet pressure and the preset pressure range.
In some embodiments of the present application, the speed of the condensing fan may be adjusted for the condensing inlet pressure during a period of time when the air conditioner outdoor unit is initially started, and the speed of the condensing fan may be controlled and adjusted based on the condensing inlet pressure and a preset pressure range, specifically:
when the pressure of the condensing inlet reaches below a first preset pressure threshold, operating at a preset minimum rotation speed of the condensing fan;
when the pressure of the condensing inlet reaches below a second preset pressure threshold and reaches above a first preset pressure threshold, the rotating speed of the condensing fan is linearly regulated forward according to the pressure of the condensing inlet;
when the pressure of the condensing inlet reaches above a second preset pressure threshold, the rotating speed of the condensing fan operates according to a preset maximum rotating speed;
wherein the first preset pressure threshold is less than a second preset pressure threshold.
In some embodiments of the present application, based on the deviation of the hydrops coefficient, the rotation speed is adjusted by using a PI, PD or PID controller, so that the deviation of the hydrops coefficient needs to be obtained, and when the rotation speed adjustment value of the condensing fan is obtained, a hydrops coefficient set point and a hydrops coefficient dead zone point are preset;
and acquiring the hydrops coefficient deviation according to the hydrops coefficient set point, the hydrops coefficient dead zone point and the acquired hydrops coefficient.
In some embodiments of the present application, the hydrops coefficient bias is calculated according to the range to which the hydrops coefficient belongs after the hydrops coefficient is acquired in real time.
According to the hydrops coefficient set point, the hydrops coefficient dead zone point and the obtained hydrops coefficient, obtaining the hydrops coefficient deviation specifically comprises:
when the acquired hydrops coefficient reaches more than the sum of the hydrops coefficient set point and the hydrops coefficient dead zone point, the hydrops coefficient deviation is the acquired hydrops coefficient minus the sum;
When the acquired hydrops coefficient reaches below the difference between the hydrops coefficient set point and the hydrops coefficient dead zone point, the hydrops coefficient deviation is the acquired hydrops coefficient minus the difference;
and when the obtained hydrops coefficient is below the summation and above the difference, the hydrops coefficient deviation is zero.
After the hydrops coefficient deviation is obtained, the rotation speed regulating value can be obtained by using the controller.
In some embodiments of the present application, there is also provided an air conditioner including:
The air conditioner indoor unit and the air conditioner outdoor unit are connected through a refrigerant connecting pipeline, and the air conditioner outdoor unit comprises:
A housing;
A condenser disposed in the housing;
a condensing fan disposed in the housing and for driving the air flow to exchange heat with the condenser;
a first pressure sensor for detecting a condensing inlet pressure of the condenser;
a second pressure sensor for detecting a condensation outlet pressure of the condenser;
A first temperature sensor for detecting a condensation outlet temperature of the condenser;
A second temperature sensor for detecting an outdoor temperature;
a processing unit configured to:
When the preset control conditions are met, the hydrops coefficient is circularly obtained;
Acquiring a hydrops coefficient deviation based on the acquired hydrops coefficient and a preset coefficient range;
Taking the deviation of the hydrops coefficient as input, and adopting a PID (proportion integration differentiation), PI (proportion integration differentiation) or PD (potential difference) controller to control and output a rotating speed regulating value of the condensing fan;
Updating the rotating speed of the condensing fan according to the rotating speed adjusting value, and controlling the condensing fan to operate at the updated rotating speed;
wherein the liquid accumulation coefficient is calculated based on the detected condensing inlet pressure, condensing outlet temperature, and outdoor temperature.
The application relates to an air conditioner, wherein the hydrops coefficient of an air conditioner outdoor unit is related to the outdoor temperature and the heat exchange capacity of a condenser, the heat exchange state of a condensing fan when the energy efficiency of a system is optimal can be accurately expressed by utilizing the hydrops coefficient, and the optimal control of the rotating speed of the condensing fan is realized under the conditions of different outdoor temperatures and different refrigerant filling amounts.
In some embodiments of the application, the hydrops coefficient is calculated based on the detected condensing inlet pressure, condensing outlet temperature and outdoor temperature, in particular:
acquiring a condensing temperature based on the detected condensing inlet pressure;
determining a condensation outlet subcooling degree of the condenser based on the condensation outlet pressure and a refrigerant outlet temperature;
calculating a temperature difference between the condensing temperature and the outdoor temperature;
And calculating the quotient between the condensation outlet supercooling degree and the temperature difference as the hydrops coefficient.
In some embodiments of the present application, the preset control conditions are satisfied, specifically:
And in the initial time period of opening the air conditioner outdoor unit, controlling and adjusting the rotating speed of the condensing fan based on the condensing inlet pressure and the preset pressure range.
In some embodiments of the present application, a hydrops coefficient set point and a hydrops coefficient dead zone point are preset when obtaining the rotational speed adjustment value of the condensing fan;
and acquiring the hydrops coefficient deviation according to the hydrops coefficient set point, the hydrops coefficient dead zone point and the acquired hydrops coefficient.
Other features and advantages of the present invention will become apparent upon review of the detailed description of the invention in conjunction with the drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
Fig. 1 is a structural view of an outdoor unit of an air conditioner according to an embodiment;
fig. 2 is an exploded view of an air conditioner outdoor unit according to an embodiment;
Fig. 3 is a left side view of an air conditioner according to an embodiment;
fig. 4 is a right side view of an air conditioner according to an embodiment;
FIG. 5 is a schematic view showing the detection of the detection parameters related to the condenser in the outdoor unit of the air conditioner according to the embodiment;
fig. 6 is a flow chart of rotational speed control of a condensing fan in an outdoor unit of an air conditioner according to an embodiment;
fig. 7 is a schematic diagram of controlling the rotational speed of a condensing fan when an outdoor unit of an air conditioner is initially started according to an embodiment;
Fig. 8 is a flow chart illustrating a control of the rotational speed of a condensing fan when an outdoor unit of an air conditioner is initially started according to an embodiment;
FIG. 9 is a flow chart of acquiring a bias of a liquid accumulation system in an outdoor unit of an air conditioner according to an embodiment;
fig. 10 is a functional block diagram of an air conditioner according to an embodiment.
Reference numerals:
100-an air conditioner outdoor unit; 110-a condenser; 120-condensing fans; 130-a housing; 140-refrigeration circuit; 200-an air conditioner indoor unit; 210-a compressor; 220-a throttle device; 230-an evaporator; 240-an internal circulation fan; 300-a first pressure sensor; 400-a second pressure sensor; 500-a first temperature sensor; 600-second temperature sensor.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
The air conditioner performs a refrigerating cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and refrigerating or heating an indoor space.
The low-temperature low-pressure refrigerant enters the compressor, the compressor compresses the refrigerant gas into a high-temperature high-pressure state, and the compressed refrigerant gas is discharged. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state formed by condensation in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator may achieve a cooling effect by exchanging heat with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner may adjust the temperature of the indoor space throughout the cycle.
An outdoor unit of an air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, an indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater of a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler of a cooling mode.
As described above, the operation principle of the air conditioner is that the air conditioner is a single cooling system outdoor unit, that is, only cooling is performed, and thus, the outdoor heat exchanger in the air conditioner outdoor unit is used as a condenser and the indoor heat exchanger in the air conditioner indoor unit is used as an evaporator.
Referring to fig. 1 to 4, there are shown structural diagrams of an outdoor unit of an air conditioner.
Fig. 1 shows an external view of an air conditioner outdoor unit, which has a housing 130, the housing 130 forms an external shape of the air conditioner outdoor unit, and a heat dissipation structure (e.g., a heat dissipation hole) is formed on the housing 130, so that heat exchange with external air is facilitated when the condenser 110 dissipates heat.
Fig. 2 shows an internal configuration of the air-conditioning outdoor unit 100, including a condenser 110, a condensing fan 120, and a refrigeration circuit 140.
In some embodiments of the present application, the compressor 210 is disposed in the air conditioning indoor unit 100, but the compressor may be disposed in the air conditioning outdoor unit 200 as in the conventional air conditioner.
The refrigeration circuit 140 is represented by a refrigerant refrigeration cycle pipe.
And referring to fig. 2, two condensing fans 120 are disposed in parallel up and down in the air conditioner outdoor unit 100.
The condensing fan 120 is used for driving the external airflow to exchange heat with the condenser 110, so as to help the condenser 110 to discharge heat outwards.
In some embodiments of the present application, the rotational speed of the condensing fan 120 is controlled by obtaining the effusion coefficient, so that the air conditioning system can operate under the optimal energy efficiency while ensuring the sufficient heat exchange of the condenser 110.
In order to calculate the hydrops coefficient, it is necessary to acquire the condensation inlet pressure P An inlet of the condenser 110, the condensation outlet pressure P An outlet of the condenser 110, the condensation outlet temperature T Out of of the condenser 110, and the outdoor temperature T Outdoor unit .
Referring to fig. 5, a schematic diagram of the detection for detecting the above detection parameters is shown.
A first pressure sensor 300 is provided at the inlet of the condenser 110 for detecting the condensing inlet pressure P An inlet .
A second pressure sensor 400 is provided at the outlet of the condenser 110 for detecting the condensing outlet pressure P An outlet .
A first temperature sensor 500 is provided at the outlet of the condenser 110 for detecting a condensation outlet temperature T Out of .
A second temperature sensor 600 is provided in a space near the condenser 110 for detecting an outdoor temperature T Outdoor unit .
Since the condenser 110 is located in the housing 130 of the outdoor unit 100 and the housing 130 has a heat dissipation structure, the temperature detected by the second temperature sensor 600 can be understood as an outdoor environment temperature.
In order to ensure the capacity and energy efficiency of the air conditioning system, the condenser 110 in the air conditioning outdoor unit 100 needs to ensure a certain outlet supercooling degree, but in some embodiments of the present application, since the air conditioning outdoor unit 100 is located in a machine room, the machine room has a wide outdoor operation range, and therefore, the single outlet supercooling degree index cannot accurately reflect the optimal energy efficiency point of the system.
Therefore, the heat exchange temperature difference of the air conditioner outdoor unit 100 is considered, and the heat exchange state of the air conditioner outdoor unit 100 is accurately expressed in the calculation of the heat exchange capacity.
The heat exchange state of the air conditioner outdoor unit 100 is represented by the heat exchange state of the condenser 110, which is inseparable from the rotational speed control of the condensing fan 120.
Therefore, the condensation fan 120 is subjected to rotation speed control based on the hydrops coefficient control, so that the heat exchange state under the optimal energy efficiency of the system is realized.
Referring to fig. 6, a flowchart of controlling the rotational speed of the condensing fan 120 based on the effusion coefficient is given.
S1: and judging whether the preset control condition is met, if so, proceeding to S2, otherwise, returning to S2.
The preset control conditions are set to give a node suitable for acquiring the detection parameters.
The preset control condition may be a set period of time after the initial start-up of the air conditioning outdoor unit 100, or may consider that, for example, the parameter of the condensing inlet pressure reaches within a preset range (i.e., the condensing inlet pressure is substantially stable), or the like.
When the preset control condition is satisfied, the air conditioner outdoor unit 100 may be considered to be in a stable operation state, and at this time, the rotational speed of the condensing fan 120 is controlled based on the effusion coefficient.
In some embodiments of the present application, the preset control condition selects to adjust the rotation speed of the condensing fan 120 based on the condensing inlet pressure during a period of time from when the air-conditioning outdoor unit 100 is initially started.
For example, the period of time is noted as T.
Referring to fig. 5 and as described above, a first pressure sensor 300 may be employed to obtain the condensing inlet pressure P An inlet .
The adjustment of the rotational speed of the condensing fan 120 during this period of time T requires the following parameters: a preset minimum rotational speed and a preset maximum rotational speed of the condensing fan 120.
When the condensing inlet pressure P An inlet reaches below the first preset pressure threshold, the condensing fan 120 is operated at a preset minimum rotational speed.
The condensing fan 120 is positively linearly adjusted according to the condensing inlet pressure when the condensing inlet pressure P An inlet reaches above a first preset pressure threshold and below a second preset pressure threshold.
When the condensing inlet pressure P An inlet reaches above the first preset pressure threshold and below the second preset pressure threshold, the rotational speed of the condensing fan 120 may be obtained based on the actual pressure correspondence of the condensing inlet pressure P An inlet , and a linear relationship between the condensing inlet pressure P An inlet and the rotational speed of the condensing fan 120 may be fitted.
The linear relationship may be obtained in advance before controlling the rotational speed of the condensing fan 120 based on the hydrops coefficient.
When the condensing inlet pressure P An inlet reaches above the second preset pressure threshold, the condensing fan 120 is operated at a preset maximum rotational speed.
The first preset pressure threshold is less than the second preset pressure threshold.
In some embodiments of the present application, the first preset pressure threshold is denoted as P1 and the second preset pressure threshold is denoted as P2.
Referring to fig. 7 and 8, when P An inlet is less than (or equal to) P1, the condensing fan 120 is operated at a preset minimum rotation speed.
When P1 is greater than (or equal to or greater than) P An inlet and less than (or equal to or less than) P2, the condensing fan 120 linearly adjusts the rotational speed of the condensing fan 120 in a forward direction based on the size of P An inlet .
Based on the known linear relationship between the condensing inlet pressure P An inlet and the rotational speed of the condensing fan 120, the preset minimum rotational speed corresponds to the condensing inlet pressure P1, the preset maximum rotational speed corresponds to the condensing inlet pressure P2, and the rotational speed of the condensing fan 120 corresponding to the current condensing inlet pressure P An inlet is calculated by interpolation.
When P An inlet is greater than (or equal to) P2, the condensing fan 120 is operated at a preset maximum rotational speed.
S2: the cycle takes the condensing inlet pressure P An inlet , the condensing outlet pressure P An outlet , the condensing outlet temperature T Out of , and the outdoor temperature T Outdoor unit .
After the initial rotation speed control of the condensation fan 120 is completed in the period T, the process goes to S2, and the rotation speed adjustment based on the hydrops coefficient is realized.
Throughout the operation period after the air-conditioning outdoor unit 100, it is necessary to cyclically acquire the condensation inlet pressure P An inlet , the condensation outlet pressure P An outlet , the condensation outlet temperature T Out of , and the outdoor temperature T Outdoor unit , and cyclically calculate the hydrops coefficient based on the above-described detection parameters.
S3: and calculating the hydrops coefficient.
In some embodiments of the present application, the hydrops coefficient takes into account the outdoor temperature and the heat exchange temperature difference, and therefore, the hydrops coefficient is obtained in the following manner.
First, the condensing temperature T Condensation is based on the obtained condensing inlet pressure P An inlet .
The different condensing inlet pressures P An inlet correspond to different condensing temperatures T Condensation , which can be known from a look-up table, which is well known to those skilled in the art.
Next, the condensation outlet supercooling degree Tsc of the condenser 110 is determined based on the condensation outlet pressure P An outlet and the condensation outlet temperature T Out of .
The supercooling degree of a condenser refers to the difference between the saturation temperature corresponding to a certain pressure at the outlet of the condenser and the actual temperature of the refrigerant.
In some embodiments of the present application, the condensation outlet subcooling degree Tsc is the difference between the corresponding saturation temperature of the condensation outlet pressure P An outlet and the condensation outlet temperature T Out of .
Further, a temperature difference Δt between the condensation temperature T Condensation and the outdoor temperature T Outdoor unit is calculated.
The temperature difference Δt reflects the heat exchange capacity of the condenser 110.
Finally, the condensate outlet supercooling degree Tsc and the temperature difference DeltaT are used as the quotient to obtain the effusion coefficient X (T).
I.e., X (T) =tsc/. DELTA.T.
Wherein t represents time, and X (t) represents the hydrops coefficient calculated in the current cycle.
In some embodiments of the application, the cycle period time_c may be chosen to be, for example, 10s, i.e., the hydrops coefficient X (t) is calculated every 10 s.
S4: based on the hydrops coefficient deviation, a PID, PD or PI controller is used to control and output the rotational speed adjustment value of the condensing fan 120.
Referring to FIG. 9, in some embodiments of the application, the hydrops coefficient bias e (t) is calculated based on a preset hydrops coefficient set point X_set and a hydrops coefficient dead zone point X_ deadzone.
In general, the hydrops coefficient dead point x_ deadzone is small, for example, 0.05.
When the acquired hydrops coefficient X (t) reaches or exceeds the sum of the hydrops coefficient set point x_set and the hydrops coefficient dead zone point x_ deadzone, the hydrops coefficient deviation e (t) is the sum of the acquired hydrops coefficient X (t) minus x_set and x_ deadzone.
For example, at X (t) > x_set+x_ deadzone, e (t) =x (t) - (x_set+x_ deadzone).
When the acquired hydrops coefficient X (t) reaches a difference between the hydrops coefficient set point x_set and the hydrops coefficient dead point x_ deadzone or less, the hydrops coefficient deviation e (t) is the difference between the acquired hydrops coefficient X (t) minus x_set and x_ deadzone.
For example, in X (t) < x_set-x_ deadzone, e (t) =x (t) - (x_set-x_ deadzone).
When the obtained hydrops coefficient X (t) is equal to or smaller than the sum of x_set and x_ deadzone and equal to or larger than the difference between x_set and x_ deadzone, the hydrops coefficient deviation e (t) is zero.
For example, at x_set-x_ deadzone +.x (t) +x_ deadzone, e (t) =0.
In some embodiments of the present application, a PID controller is used to control the rotational speed adjustment value r (t) of the output condensing fan 120.
When the PID controller is employed, it is necessary to determine in advance the proportional coefficient ratio_s, the integral Time constant time_i, and the differential Time constant time_d of the PID controller.
In some embodiments of the present application, the Ratio coefficient ratio_s is set to 2, the integration Time constant time_i is set to 60 seconds, and the differential Time constant time_d is set to 0 seconds.
The PID controller can be expressed by the following control formula.
r(t)=Ratio_s*[e(t)-e(t-1)]+Ratio_s*(Time_c/Time_i)*e(t)+Ratio_s*(Time_d/Time_c)*[e(t)-2e(t-1)+e(t-2)].
Wherein e (t) represents the hydrops coefficient deviation in the current cycle, e (t-1) represents the hydrops coefficient deviation in the previous cycle, and e (t-2) represents the hydrops coefficient deviation in the previous cycle.
Similarly, a PD or PI controller may be used to effect speed regulation of the condensing fan 120 as well.
S5: the rotational speed of the condensing fan 120 is updated.
The rotation speed of the condensing fan 120 is updated with the rotation speed adjustment value R (t) and the rotation speed R (t) of the current condensing fan 120, that is, the updated rotation speed of the condensing fan 120 is R (t) +r (t).
S6: the condensing fan 120 is controlled to operate at the updated rotational speed of the condensing fan 120.
The above-mentioned process is performed by a processing unit (not shown) in the air conditioner outdoor unit 100, and after the updated rotation speed R (t) +r (t) is obtained by calculation, the updated rotation speed R (t) +r (t) is sent to a control unit (not shown) in the air conditioner outdoor unit 100, so as to control the condensation fan 120 to operate at the rotation speed R (t) +r (t).
After the cycle period time_c elapses, the operation returns to S2, thereby cycling.
As described above, the air conditioning outdoor unit 100 can control the rotational speed of the condensing fan 120 by using the liquid accumulation coefficient, and can perform optimal control of the condensing fan 120 under different environmental temperatures and different refrigerant charges by taking into consideration both the outdoor temperature and the heat exchange capacity of the air conditioning outdoor unit 100 and by taking into consideration the maximum energy efficiency of the air conditioning system.
The present application also proposes an air conditioner, referring to fig. 10, which includes an air conditioner indoor unit 200 and an air conditioner outdoor unit, the air conditioner outdoor unit being the air conditioner outdoor unit 100 as described above.
The air conditioning indoor unit 200 includes a compressor 210, an evaporator 230, a throttle device 220, and an inner circulation fan 240.
The inner circulation fan 240 drives the indoor air flow to exchange heat with the evaporator 230.
The air conditioner of the application is a single refrigeration air conditioner, and the refrigeration working principle is as follows: the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 210 is condensed into a high-temperature and high-pressure liquid refrigerant in the condenser 110 (the condenser 110 releases heat and the heat is released to the atmosphere by the condensing fan 120), the high-temperature and high-pressure liquid refrigerant flows into the throttling device 220, the liquid refrigerant flowing out of the throttling device 220 flows into the evaporator 230 (the liquid refrigerant in the evaporator 230 rapidly evaporates and absorbs heat, the air blown out by the internal circulation fan 240 is cooled by the coil of the evaporator 230 and then becomes cold air to be blown into the room), and the low-temperature and low-pressure gaseous refrigerant flowing out of the evaporator 230 flows back to the suction end of the compressor 210, so that the refrigerating effect is achieved by circulation.
In the description of the above embodiments, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (10)
1. An air conditioner outdoor unit for connecting an air conditioner indoor unit of an air conditioner, the air conditioner outdoor unit comprising:
A housing;
A condenser disposed in the housing;
a condensing fan disposed in the housing and for driving the air flow to exchange heat with the condenser;
a first pressure sensor for detecting a condensing inlet pressure of the condenser;
a second pressure sensor for detecting a condensation outlet pressure of the condenser;
A first temperature sensor for detecting a condensation outlet temperature of the condenser;
A second temperature sensor for detecting an outdoor temperature;
a processing unit configured to:
When the preset control conditions are met, the hydrops coefficient is circularly obtained;
Acquiring a hydrops coefficient deviation based on the acquired hydrops coefficient and a preset coefficient range;
Taking the deviation of the hydrops coefficient as input, and adopting a PID (proportion integration differentiation), PI (proportion integration differentiation) or PD (potential difference) controller to control and output a rotating speed regulating value of the condensing fan;
Updating the rotating speed of the condensing fan according to the rotating speed adjusting value, and controlling the condensing fan to operate at the updated rotating speed;
wherein the liquid accumulation coefficient is calculated based on the detected condensing inlet pressure, condensing outlet temperature, and outdoor temperature.
2. The outdoor unit of claim 1, wherein the liquid accumulation coefficient is calculated based on the detected condensing inlet pressure, condensing outlet temperature, and outdoor temperature, specifically:
acquiring a condensing temperature based on the detected condensing inlet pressure;
determining a condensation outlet subcooling degree of the condenser based on the condensation outlet pressure and a refrigerant outlet temperature;
calculating a temperature difference between the condensing temperature and the outdoor temperature;
And calculating the quotient between the condensation outlet supercooling degree and the temperature difference as the hydrops coefficient.
3. The outdoor unit of claim 1, wherein the preset control conditions are satisfied, specifically:
And in the initial time period of opening the air conditioner outdoor unit, controlling and adjusting the rotating speed of the condensing fan based on the condensing inlet pressure and the preset pressure range.
4. The outdoor unit of claim 3, wherein the rotational speed of the condensing fan is controlled and adjusted based on the condensing inlet pressure and a preset pressure range, specifically:
when the pressure of the condensing inlet reaches below a first preset pressure threshold, operating at a preset minimum rotation speed of the condensing fan;
when the pressure of the condensing inlet reaches below a second preset pressure threshold and reaches above a first preset pressure threshold, the rotating speed of the condensing fan is linearly regulated forward according to the pressure of the condensing inlet;
when the pressure of the condensing inlet reaches above a second preset pressure threshold, the rotating speed of the condensing fan operates according to a preset maximum rotating speed;
wherein the first preset pressure threshold is less than a second preset pressure threshold.
5. The outdoor unit of claim 2, wherein a hydrops coefficient set point and a hydrops coefficient dead zone point are preset when the rotational speed adjustment value of the condensing fan is obtained;
and acquiring the hydrops coefficient deviation according to the hydrops coefficient set point, the hydrops coefficient dead zone point and the acquired hydrops coefficient.
6. The outdoor unit of claim 5, wherein the hydrops coefficient bias is obtained based on the hydrops coefficient set point and the hydrops coefficient dead zone point, and the obtained hydrops coefficient, specifically:
when the acquired hydrops coefficient reaches more than the sum of the hydrops coefficient set point and the hydrops coefficient dead zone point, the hydrops coefficient deviation is the acquired hydrops coefficient minus the sum;
When the acquired hydrops coefficient reaches below the difference between the hydrops coefficient set point and the hydrops coefficient dead zone point, the hydrops coefficient deviation is the acquired hydrops coefficient minus the difference;
and when the obtained hydrops coefficient is below the summation and above the difference, the hydrops coefficient deviation is zero.
7. An air conditioner, comprising:
The air conditioner indoor unit and the air conditioner outdoor unit are connected through a refrigerant connecting pipeline, and the air conditioner outdoor unit comprises:
A housing;
A condenser disposed in the housing;
a condensing fan disposed in the housing and for driving the air flow to exchange heat with the condenser;
a first pressure sensor for detecting a condensing inlet pressure of the condenser;
a second pressure sensor for detecting a condensation outlet pressure of the condenser;
A first temperature sensor for detecting a condensation outlet temperature of the condenser;
A second temperature sensor for detecting an outdoor temperature;
a processing unit configured to:
When the preset control conditions are met, the hydrops coefficient is circularly obtained;
Acquiring a hydrops coefficient deviation based on the acquired hydrops coefficient and a preset coefficient range;
Taking the deviation of the hydrops coefficient as input, and adopting a PID (proportion integration differentiation), PI (proportion integration differentiation) or PD (potential difference) controller to control and output a rotating speed regulating value of the condensing fan;
Updating the rotating speed of the condensing fan according to the rotating speed adjusting value, and controlling the condensing fan to operate at the updated rotating speed;
wherein the liquid accumulation coefficient is calculated based on the detected condensing inlet pressure, condensing outlet temperature, and outdoor temperature.
8. The air conditioner according to claim 7, wherein the liquid accumulation coefficient is calculated based on the detected condensing inlet pressure, condensing outlet temperature and outdoor temperature, in particular:
acquiring a condensing temperature based on the detected condensing inlet pressure;
determining a condensation outlet subcooling degree of the condenser based on the condensation outlet pressure and a refrigerant outlet temperature;
calculating a temperature difference between the condensing temperature and the outdoor temperature;
And calculating the quotient between the condensation outlet supercooling degree and the temperature difference as the hydrops coefficient.
9. The air conditioner according to claim 7, wherein the preset control condition is satisfied, specifically:
And in the initial time period of opening the air conditioner outdoor unit, controlling and adjusting the rotating speed of the condensing fan based on the condensing inlet pressure and the preset pressure range.
10. The air conditioner of claim 8, wherein a hydrops coefficient set point and a hydrops coefficient dead zone point are preset when obtaining the rotational speed adjustment value of the condensing fan;
and acquiring the hydrops coefficient deviation according to the hydrops coefficient set point, the hydrops coefficient dead zone point and the acquired hydrops coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310178423.1A CN118391746A (en) | 2023-02-27 | 2023-02-27 | Air conditioner outdoor unit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310178423.1A CN118391746A (en) | 2023-02-27 | 2023-02-27 | Air conditioner outdoor unit and air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118391746A true CN118391746A (en) | 2024-07-26 |
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ID=92004827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310178423.1A Pending CN118391746A (en) | 2023-02-27 | 2023-02-27 | Air conditioner outdoor unit and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118391746A (en) |
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2023
- 2023-02-27 CN CN202310178423.1A patent/CN118391746A/en active Pending
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