CN112212473A - Refrigeration control method of fixed-frequency air conditioner under high-temperature working condition - Google Patents

Refrigeration control method of fixed-frequency air conditioner under high-temperature working condition Download PDF

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Publication number
CN112212473A
CN112212473A CN201910620485.7A CN201910620485A CN112212473A CN 112212473 A CN112212473 A CN 112212473A CN 201910620485 A CN201910620485 A CN 201910620485A CN 112212473 A CN112212473 A CN 112212473A
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Prior art keywords
wind speed
pressure value
condenser
air conditioner
fixed
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Inventor
李延政
刘明
牛巧宁
王玉洁
王录娥
周鹏
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Qingdao Haier Jiaozhou Air Conditioner Co Ltd
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Qingdao Haier Jiaozhou Air Conditioner Co Ltd
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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
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • 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
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • 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
    • F24F11/89—Arrangement or mounting of control or safety devices
    • 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)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Fluid Mechanics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention belongs to the field of air conditioners, and particularly provides a refrigeration control method of a fixed-frequency air conditioner under a high-temperature working condition. The invention aims to solve the problem that the load condition of a fixed-frequency compressor cannot be accurately judged by the conventional temperature sensor, and further the rotating speed of an indoor fan cannot be accurately controlled, the fixed-frequency air conditioner comprises a condenser, an evaporator, the fixed-frequency compressor and the indoor fan, and the refrigeration control method of the fixed-frequency air conditioner under the high-temperature working condition comprises the following steps: detecting the pressure value P of the condenserc(ii) a Pressure value P based on condensercAnd controlling the wind speed R of the indoor fan. The load condition of the constant-frequency compressor is judged by the pressure value of the condenser, so that the external interference is less and the judgment is more accurate.

Description

Refrigeration control method of fixed-frequency air conditioner under high-temperature working condition
Technical Field
The invention belongs to the technical field of air conditioners, and particularly provides a refrigeration control method of a fixed-frequency air conditioner under a high-temperature working condition.
Background
The fixed-frequency air conditioner has low production cost and high performance-price ratio, so the fixed-frequency air conditioner also occupies a part of markets for a long time in the field of air conditioners. The frequency of the compressor of the conventional fixed-frequency air conditioner is fixed, and when the air conditioner refrigerates under a high-temperature working condition, the compressor is in a high-load state for a long time due to the fact that the output power cannot be adjusted, the temperature of the compressor is too high, the air conditioner triggers a protection shutdown mechanism, and the fixed-frequency air conditioner cannot continuously refrigerate.
In the prior art, the exhaust temperature of the compressor is usually detected to adjust the air speed of the indoor fan, the smaller the air speed of the indoor fan is, the less the heat exchange between the air conditioner and the indoor air is, so that the return air temperature of the fixed-frequency air conditioner is lower, the output power of the compressor is also reduced, the condition of protection shutdown is avoided, and the fixed-frequency compressor can continuously refrigerate.
However, the prior art generally arranges a temperature sensor at the exhaust port of the compressor, the temperature sensor is not arranged inside the fixed-frequency compressor, and the load condition of the fixed-frequency compressor cannot be intuitively displayed. Moreover, because the air conditioner outdoor unit is installed at different positions, for example, the air conditioner outdoor unit is installed towards the sun or the air conditioner outdoor unit is installed towards the shade, the direct sunlight at different angles can directly influence the detection data of the temperature sensor, so that the exhaust temperature is not accurately detected, and the load condition of the compressor is judged by mistake.
Accordingly, there is a need in the art for a new refrigeration control method for a fixed-frequency air conditioner under high-temperature conditions to solve the problem that the load condition of a fixed-frequency compressor cannot be accurately determined by the existing temperature sensor, and further the rotating speed of an indoor fan cannot be accurately controlled.
Disclosure of Invention
In order to solve the problems in the prior art, namely to solve the problem that the load condition of a fixed-frequency compressor cannot be accurately judged by an existing temperature sensor and further the rotating speed of an indoor fan cannot be accurately controlled, the invention provides a refrigeration control method of a fixed-frequency air conditioner under a high-temperature working condition, wherein the fixed-frequency air conditioner comprises a condenser, an evaporator, a fixed-frequency compressor and an indoor fan, and the refrigeration control method comprises the following steps:
detecting a pressure value P of the condenserc；
Based on the pressure value P of the condensercAnd controlling the size of the wind speed R of the indoor fan.
In the preferable technical scheme of the refrigeration control method of the fixed-frequency air conditioner under the high-temperature working condition, the pressure value P based on the condensercThe step of controlling the magnitude of the wind speed R of the indoor fan further includes:
when P is presentc≥Pc1When the fan is in operation, the indoor fan is controlled to stop operating;
wherein, Pc1A threshold value is set for the first.
In a preferable technical solution of the refrigeration control method of the fixed-frequency air conditioner under the high-temperature working condition, the control method further includes:
at Pc2＜Pc＜Pc1In time, the wind speed R of the indoor fan is controlled from the current wind speed R0Reducing to a set wind speed value R1；
Wherein, Pc2For the second setting threshold, and Pc2＜Pc1。
In a preferable technical solution of the refrigeration control method of the fixed-frequency air conditioner under the high-temperature working condition, the control method further includes:
when P is presentc≤Pc2In time, the wind speed R of the fan in the control room is maintained at the current wind speed R0。
In the preferable technical scheme of the refrigeration control method of the fixed-frequency air conditioner under the high-temperature working condition, the pressure value P of the condenser is detectedc"the control method further includes, after the step of:
detecting a pressure value P of the evaporatore；
"pressure value P based on the condensercThe step of controlling the magnitude of the wind speed R of the indoor fan further includes:
based on the pressure value P of the condensercAnd a pressure value P of the evaporatoreAnd controlling the size of the wind speed R of the indoor fan.
In the preferable technical scheme of the refrigeration control method of the fixed-frequency air conditioner under the high-temperature working condition, the pressure value P based on the condensercAnd a pressure value P of the evaporatoreThe step of controlling the magnitude of the wind speed R of the indoor fan further includes:
when P is presentc≥Pc1Or Pe≥Pe1When the fan is in operation, the indoor fan is controlled to stop operating;
wherein, Pc1Setting a threshold value for the first time; pe1A threshold value is set for the third.
In the preferable technical scheme of the refrigeration control method of the fixed-frequency air conditioner under the high-temperature working condition, the pressure value P based on the condensercAnd a pressure value P of the evaporatoreThe step of controlling the wind speed R of the indoor fan further includes:
at Pc＜Pc1And P ise＜Pe1Under the condition that P isc≤Pc2And P ise≤Pe2In time, the wind speed R of the fan in the control room is maintained at the current wind speed R0；
Otherwise, controlling the wind speed R of the indoor fan to be from the current wind speed R0Reducing to a set wind speed value R1；
Wherein, Pc2For the second setting threshold, and Pc2＜Pc1；Pe2Set a threshold for the fourth, and Pe2＜Pe1。
In the preferable technical scheme of the refrigeration control method of the fixed-frequency air conditioner under the high-temperature working condition, the pressure value P based on the condensercAnd a pressure value P of the evaporatoreThe step of controlling the magnitude of the wind speed R of the indoor fan further includes:
based on the pressure value P of the condensercPressure value P of the evaporatoreAnd PcAnd PeTotal pressure value PmAnd controlling the size of the wind speed R of the indoor fan.
In the preferable technical scheme of the refrigeration control method of the fixed-frequency air conditioner under the high-temperature working condition, the pressure value P based on the condensercPressure value P of the evaporatoreAnd PcAnd PeTotal pressure value PmThe step of controlling the magnitude of the wind speed R of the indoor fan further includes:
when P is presentc≥Pc1Or Pe≥Pe1Or Pm≥Pm1When the fan is in operation, the indoor fan is controlled to stop operating;
wherein, Pc1Setting a threshold value for the first time; pe1Setting a threshold for the third; pm1A threshold value is set for the fifth.
In the preferable technical scheme of the refrigeration control method of the fixed-frequency air conditioner under the high-temperature working condition, the pressure value P based on the condensercPressure value P of the evaporatoreAnd PcAnd PeTotal pressure value PmThe step of controlling the wind speed R of the indoor fan further includes:
at Pc＜Pc1And P ise＜Pe1And P ism＜Pm1Under the condition that P isc≤Pc2And P ise≤Pe2And P ism≤Pm2In time, the wind speed R of the fan in the control room is maintained at the current wind speed R0；
Otherwise, controlling the wind speed R of the indoor fan to be from the current wind speed R0Reducing to a set wind speed value R1；
Wherein, Pc2For the second setting threshold, and Pc2＜Pc1；Pe2Set a threshold for the fourth, and Pe2＜Pe1；Pm2Setting a threshold for the sixthValue, and Pm2＜Pm1。
The technical solution of the present invention is that, in order to more accurately determine the load condition of the fixed-frequency compressor, the fixed-frequency air conditioner of the present invention includes a condenser, an evaporator, a fixed-frequency compressor and an indoor fan, and the refrigeration control method of the fixed-frequency air conditioner under the high-temperature condition includes: detecting the pressure value P of the condenserc(ii) a Pressure value P based on condensercAnd controlling the wind speed R of the indoor fan.
Through the arrangement mode, the load condition of the fixed-frequency compressor is judged through the pressure value of the condenser, the pressure value of the condenser is directly provided by the fixed-frequency compressor, the position of the condenser is relatively closed, and the pressure value of the condenser is greatly smaller than the detection value of the temperature sensor due to external interference during detection, so that the load condition of the fixed-frequency compressor can be more accurately reflected by the pressure value of the condenser, the misjudgment is further avoided, the rotating speed of an indoor fan can be accurately controlled by the fixed-frequency air conditioner, and the fixed-frequency compressor can be ensured to continuously refrigerate.
Drawings
The refrigeration control method of the fixed-frequency air conditioner under the high-temperature working condition is described below with reference to the attached drawings. In the drawings:
FIG. 1 is a flow chart of a refrigeration control method of a fixed-frequency air conditioner under high-temperature working conditions according to the present invention;
FIG. 2 is a logic diagram of a first embodiment of the refrigeration control method of the fixed-frequency air conditioner under high temperature conditions according to the present invention;
FIG. 3 is a logic diagram of a second embodiment of the refrigeration control method of the fixed-frequency air conditioner under high temperature conditions according to the present invention;
fig. 4 is a logic diagram of a third embodiment of the refrigeration control method of the fixed-frequency air conditioner under high-temperature conditions according to the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be adjusted as needed by those skilled in the art to suit particular applications. For example, although the specification describes the case where the pressure value of the condenser is used as the load condition measure of the constant-frequency compressor, it is obvious that the invention can use the pressure value of the evaporator alone as the measure, the condenser and the evaporator are essentially the same, and they can be interchanged in the processes of cooling and heating, and are both heat exchangers, therefore, it is within the scope of the invention as long as the load condition of the constant-frequency compressor is measured according to the pressure value in the heat exchangers.
Example one
First, referring to fig. 1 and 2, a first embodiment of the present invention will be described. Fig. 1 is a flowchart of a refrigeration control method of a fixed-frequency air conditioner under a high-temperature condition according to the present invention, and fig. 2 is a logic diagram of a first embodiment of the refrigeration control method of the fixed-frequency air conditioner under a high-temperature condition according to the present invention.
As shown in fig. 1, in order to solve the problem that the load condition of the fixed-frequency compressor cannot be accurately judged by the conventional temperature sensor, and further the rotating speed of the indoor fan cannot be accurately controlled, the fixed-frequency air conditioner of the present invention comprises a condenser, an evaporator, a fixed-frequency compressor and an indoor fan, and the refrigeration control method of the fixed-frequency air conditioner under the high-temperature working condition comprises the following steps:
s100, detecting the pressure value P of the condenserc(ii) a For example, by providing a pressure value sensor in the condenser line, or providing a stress sensor on the outer surface of the condenser, the pressure value in the condenser line is indirectly detected by a slight change in stress of the outer surface.
S200, pressure value P based on condensercControlling the wind speed R of the indoor fan; for example, the pressure value sensor transmits the detected pressure value to a control unit of the air conditioner, and the control unit is based on the pressure value P of the condensercThe wind speed R of the indoor fan is controlled.
The setting mode has the advantages that: the load condition of the fixed-frequency compressor is judged by the pressure value of the condenser, and the pressure value of the condenser is directly provided by the fixed-frequency compressor, so that the pressure value of the condenser is greatly reduced by external interference in detection relative to the detection of the temperature sensor, the load condition of the fixed-frequency compressor can be more accurately reflected by the pressure value of the condenser, the misjudgment is further avoided, the rotating speed of an indoor fan can be accurately controlled by the fixed-frequency air conditioner, and the fixed-frequency compressor can be ensured to continuously refrigerate.
With further reference to fig. 2, a first embodiment of the refrigeration control method of the fixed-frequency air conditioner under high temperature condition according to the present invention will be described in detail.
As shown in FIG. 2, in one possible embodiment, the "condenser-based pressure value PcThe step of controlling the wind speed R of the indoor fan further comprises:
judgment of PcAnd Pc1And Pc2The size of (d); wherein, Pc1For the first setting of a threshold value, Pc2For the second setting threshold, and Pc2＜Pc1. Wherein, Pc1And Pc2The obtaining of (b) may be obtained based on calculation, or may be obtained based on experiment, for example, multiple times of experiment of pressure values of the constant-frequency air conditioner at a certain temperature during protection shutdown, and the average value is taken as Pc1And replacing another temperature until an experience table is obtained, and inquiring P through the experience tablec1The value of (c).
When P is presentc≥Pc1When the fan is in operation, the indoor fan is controlled to stop operating; when P is presentc≥Pc1At this time, it is shown that the pressure value of the condenser is higher than a first preset threshold value P preset under the high-temperature working conditionc1，Pc1The load condition of the fixed-frequency compressor is close to overload protection at the moment, the load of the fixed-frequency compressor needs to be reduced to the maximum capacity at the moment, the indoor fan is controlled to stop running, indoor heat exchange is reduced to the minimum, the output load of the fixed-frequency compressor is reduced to the minimum at the moment, the temperature of the fixed-frequency compressor is reduced, and protection shutdown is avoided.
When P is presentc2＜Pc＜Pc1In time, the wind speed R of the indoor fan is controlled from the current wind speed R0Reducing to a set wind speed value R1(ii) a When P is presentc2＜Pc＜Pc1When the pressure value of the condenser is higher than a second set threshold value Pc2But not higher than the first set threshold Pc1To explain that the load of the fixed-frequency compressor is slightly large, but the state close to overload protection is not yet reached, at this time, the wind speed R of the indoor fan needs to be controlled from the current wind speed R0Reducing to a set wind speed value R1The indoor heat exchange is relatively reduced, so that the load of the fixed-frequency compressor is further reduced, and the temperature of the compressor is reduced to a normal temperature and a load range under the condition of meeting the refrigeration of a user.
Further, when P isc≤Pc2In time, the wind speed R of the fan in the control room is maintained at the current wind speed R0(ii) a When P is presentc≤Pc2At this time, the load condition of the fixed-frequency air conditioner is in a normal range, the wind speed of the indoor fan does not need to be limited, and the fixed-frequency air conditioner can adapt to the load, so that the wind speed is maintained at the current wind speed R0And (4) finishing.
Example two
A second embodiment of the present invention will be described in detail with reference to fig. 1 and fig. 3, wherein fig. 3 is a logic diagram of a second embodiment of a refrigeration control method of a fixed-frequency air conditioner under high temperature conditions according to the present invention.
In a possible embodiment, as shown in fig. 1 and 3, the pressure value P of the condenser is "detectedc"after the step, the refrigeration control method further includes: detecting pressure value P of evaporatore(ii) a "condenser-based pressure value PcThe step of controlling the wind speed R of the indoor fan further comprises: pressure value P based on condensercAnd pressure value P of the evaporatoreAnd controlling the wind speed R of the indoor fan.
The setting mode has the advantages that: the pressure value P of the evaporator is increasedeAs a judgment condition, by PcAnd PeMeanwhile, the load condition of the fixed-frequency compressor can be reflected more accurately by controlling, because the refrigerant in the air conditioner flows among the compressor, the throttling element, the condenser and the evaporatorAccordingly, a delay in the flow of the refrigerant may occur between the condenser and the evaporator. By increasing the judgment of the pressure value of the evaporator, the condition that the independent judgment is not accurate enough and the erroneous judgment is possibly caused by the problem of the pressure value monitoring device is avoided.
With further reference to fig. 3, a second embodiment of the refrigeration control method of the fixed-frequency air conditioner under high temperature conditions according to the present invention will be described in detail.
As shown in FIG. 3, "condenser-based pressure value PcAnd pressure value P of the evaporatoreThe step of controlling the wind speed R of the indoor fan comprises the following steps:
judgment of PcAnd Pc1And Pc2Is of a size of, and PeAnd Pe1And Pe2The size of (2). Wherein, Pc1And Pc2And Pe1And Pe2The numerical value of (a) can be obtained in the same manner as in the first embodiment, and may be obtained based on actual experience or obtained through calculation.
When P is presentc≥Pc1Or Pe≥Pe1When the fan is stopped, the indoor fan is controlled to stop running, wherein Pc1Setting a threshold value for the first time; pe1A threshold value is set for the third.
When P is presentc≥Pc1Or Pe≥Pe1And at the moment, if one pressure value exceeds the preset threshold value, the load of the fixed-frequency compressor can be judged to be about to reach a protection shutdown state, and the indoor fan is shut down in the same control mode as the first embodiment. Compared with the judgment through a single pressure value, the judgment of the second embodiment is more accurate and more timely, so that the shutdown probability of the fixed-frequency compressor can be further reduced.
At Pc＜Pc1And P ise＜Pe1Under the condition that P isc≤Pc2And P ise≤Pe2In time, the wind speed R of the fan in the control room is maintained at the current wind speed R0(ii) a Otherwise, controlling the wind speed R of the indoor fan to be correctFront wind speed R0Reducing to a set wind speed value R1(ii) a Wherein, Pc2For the second setting threshold, and Pc2＜Pc1；Pe2Set a threshold for the fourth, and Pe2＜Pe1。
When P is presentc≤Pc2And P ise≤Pe2And when the load of the fixed-frequency compressor is in a normal range, the rotating speed of the indoor fan does not need to be changed. At Pc＜Pc1And P ise＜Pe1Under the condition that P isc≤Pc2And P ise≤Pe2If the load of the fixed-frequency compressor exceeds the normal range, the load of the fixed-frequency compressor does not reach the threshold close to shutdown protection, and the control mode is almost the same as that of the first embodiment, and the wind speed R of the indoor fan is controlled from the current wind speed R0Reducing to a set wind speed value R1Namely R is1The value of (b) can be set according to the actual conditions of the ambient temperature, the output power of the fixed-frequency compressor and the like.
EXAMPLE III
A third embodiment of the present invention is described in detail below with further reference to fig. 4. Fig. 4 is a logic diagram of a third embodiment of the refrigeration control method of the fixed-frequency air conditioner under the high-temperature working condition according to the present invention.
The third embodiment is to add P to the second embodimentcAnd PeTotal pressure value PmThe load condition of the fixed-frequency air conditioner is judged more accurately as one of the judgment conditions.
Specifically, the "condenser-based pressure value PcAnd pressure value P of the evaporatoreThe step of controlling the wind speed R of the indoor fan further comprises: pressure value P based on condensercPressure value P of evaporatoreAnd PcAnd PeTotal pressure value PmAnd controlling the wind speed R of the indoor fan.
As shown in FIG. 4, "condenser-based pressure value PcPressure value P of evaporatoreAnd PcAnd PeTotal pressure value PmThe step of controlling the wind speed R of the indoor fan comprises the following steps:
judgment of PcAnd Pc1And Pc2Size, P ofeAnd Pe1And Pe2Size and P ofmAnd Pm1And Pm2The size of (d); wherein, Pc1And Pc2，Pe1And Pe2And Pm1And Pm2The numerical value of (a) can be obtained in the same manner as in the first embodiment, and may be obtained based on actual experience or obtained through calculation.
When P is presentc≥Pc1Or Pe≥Pe1Or Pm≥Pm1When the fan is in operation, the indoor fan is controlled to stop operating; wherein, Pc1Setting a threshold value for the first time; pe1Setting a threshold for the third; pm1A threshold value is set for the fifth.
At Pc＜Pc1And P ise＜Pe1And P ism＜Pm1Under the condition that P isc≤Pc2And P ise≤Pe2And P ism≤Pm2In time, the wind speed R of the fan in the control room is maintained at the current wind speed R0(ii) a Otherwise, controlling the wind speed R of the indoor fan from the current wind speed R0Reducing to a set wind speed value R1(ii) a Wherein, Pc2For the second setting threshold, and Pc2＜Pc1；Pe2Set a threshold for the fourth, and Pe2＜Pe1；Pm2A threshold value is set for the sixth, and Pm2＜Pm1。
The control method of the third embodiment is substantially the same as that of the second embodiment, and P is further increasedcAnd PeTotal pressure value PmThe reason for the judgment condition is that the pressure sum of the two compressors can reflect the load condition of the constant-frequency compressor due to hysteresis, and the judgment condition is introduced, so that the air conditioner is less prone to shutdown protection, and the load feedback of the constant-frequency compressor is more sensitive.
To sum up, through the judgment of the pressure value of introducing the condenser, the pressure value of the evaporator and the sum of the pressure values of the condenser and the evaporator, the load condition of the fixed-frequency compressor can be fed back to the control unit of the fixed-frequency air conditioner more quickly and accurately, and then the rotating speed of the indoor fan can be controlled more accurately, so that the control unit of the fixed-frequency air conditioner is prevented from being inaccurate in judgment of the load condition of the fixed-frequency compressor, the indoor fan is controlled by mistake, and the shutdown protection condition is avoided.
It should be noted that the above-mentioned embodiments are only used for illustrating the principle of the present invention, and are not intended to limit the protection scope of the present invention, and those skilled in the art can modify the above-mentioned structure so that the present invention can be applied to more specific application scenarios without departing from the principle of the present invention.
For example, in an alternative embodiment, Pc、PeAnd PmThe three methods can be used alone or in combination of any two methods to detect the load condition of the fixed-frequency compressor, and the load condition of the fixed-frequency compressor can be judged by the pressure values of the condenser and the evaporator without departing from the principle of the invention, so that the method and the device fall into the protection scope of the invention.
Those skilled in the art will appreciate that the air conditioner described above may also include other known structures such as processors, controllers, memories, etc., wherein the memories include, but are not limited to, ram, flash, rom, prom, volatile, non-volatile, serial, parallel, or registers, etc., and the processors include, but are not limited to, CPLD/FPGA, DSP, ARM processor, MIPS processor, etc. Such well-known structures are not shown in the drawings in order to not unnecessarily obscure embodiments of the present disclosure.
Although the foregoing embodiments describe the steps in the above sequential order, those skilled in the art will understand that, in order to achieve the effect of the present embodiments, the steps may not be executed in such an order, and may be executed simultaneously (in parallel) or in an inverse order, and these simple variations are within the scope of the present invention.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims (10)

1. A refrigeration control method of a fixed-frequency air conditioner under a high-temperature working condition is characterized in that the fixed-frequency air conditioner comprises a condenser, an evaporator, a fixed-frequency compressor and an indoor fan, and the control method comprises the following steps:
detecting a pressure value P of the condenserc；
Based on the pressure value P of the condensercAnd controlling the size of the wind speed R of the indoor fan.
2. The refrigeration control method of the constant-frequency air conditioner under the high-temperature working condition according to claim 1, wherein the pressure value P based on the condenser iscThe step of controlling the magnitude of the wind speed R of the indoor fan further includes:
when P is presentc≥Pc1When the fan is in operation, the indoor fan is controlled to stop operating;
wherein, Pc1A threshold value is set for the first.
3. A refrigeration control method of a fixed-frequency air conditioner under high-temperature working condition as claimed in claim 2, wherein the control method further comprises:
at Pc2＜Pc＜Pc1In time, the wind speed R of the indoor fan is controlled from the current wind speed R0Reducing to a set wind speed value R1；
Wherein, Pc2For the second setting threshold, and Pc2＜Pc1。
4. A refrigeration control method of a fixed-frequency air conditioner under high-temperature working condition as claimed in claim 3, wherein the control method further comprises:
when P is presentc≤Pc2In time, the wind speed R of the fan in the control room is maintained at the current wind speed R0。
5. The refrigeration control method of the constant-frequency air conditioner under the high-temperature working condition according to claim 1, wherein the pressure value P of the condenser is detectedc"the control method further includes, after the step of:
detecting a pressure value P of the evaporatore；
"pressure value P based on the condensercThe step of controlling the magnitude of the wind speed R of the indoor fan further includes:
based on the pressure value P of the condensercAnd a pressure value P of the evaporatoreAnd controlling the size of the wind speed R of the indoor fan.
6. The refrigeration control method of the constant-frequency air conditioner under the high-temperature working condition according to claim 5, wherein the pressure value P based on the condenser iscAnd a pressure value P of the evaporatoreThe step of controlling the magnitude of the wind speed R of the indoor fan further includes:
when P is presentc≥Pc1Or Pe≥Pe1When the fan is in operation, the indoor fan is controlled to stop operating;
wherein, Pc1Setting a threshold value for the first time; pe1A threshold value is set for the third.
7. The refrigeration control method of the constant-frequency air conditioner under the high-temperature working condition according to claim 6, wherein the pressure value P based on the condenser iscAnd a pressure value P of the evaporatoreThe step of controlling the wind speed R of the indoor fan further includes:
at Pc＜Pc1And P ise＜Pe1Under the condition that P isc≤Pc2And P ise≤Pe2In time, the wind speed R of the fan in the control room is maintained at the current wind speed R0；
Otherwise, controlling the wind speed R of the indoor fan to be from the current wind speed R0Reducing to a set wind speed value R1；
Wherein, Pc2For the second setting threshold, and Pc2＜Pc1；Pe2Set a threshold for the fourth, and Pe2＜Pe1。
8. The refrigeration control method of the constant-frequency air conditioner under the high-temperature working condition according to claim 5, wherein the pressure value P based on the condenser iscAnd a pressure value P of the evaporatoreThe step of controlling the magnitude of the wind speed R of the indoor fan further includes:
based on the pressure value P of the condensercPressure value P of the evaporatoreAnd PcAnd PeTotal pressure value PmAnd controlling the size of the wind speed R of the indoor fan.
9. The refrigeration control method of the constant-frequency air conditioner under the high-temperature working condition according to claim 8, wherein the pressure value P based on the condenser iscPressure value P of the evaporatoreAnd PcAnd PeTotal pressure value PmThe step of controlling the magnitude of the wind speed R of the indoor fan further includes:
when P is presentc≥Pc1Or Pe≥Pe1Or Pm≥Pm1When the fan is in operation, the indoor fan is controlled to stop operating;
wherein, Pc1Setting a threshold value for the first time; pe1Setting a threshold for the third; pm1A threshold value is set for the fifth.
10. The refrigeration control method of the constant-frequency air conditioner under the high-temperature working condition according to claim 9, wherein the pressure value P based on the condenser iscPressure of the evaporatorForce value PeAnd PcAnd PeTotal pressure value PmThe step of controlling the wind speed R of the indoor fan further includes:
at Pc＜Pc1And P ise＜Pe1And P ism＜Pm1Under the condition that P isc≤Pc2And P ise≤Pe2And P ism≤Pm2In time, the wind speed R of the fan in the control room is maintained at the current wind speed R0；
Otherwise, controlling the wind speed R of the indoor fan to be from the current wind speed R0Reducing to a set wind speed value R1；
Wherein, Pc2For the second setting threshold, and Pc2＜Pc1；Pe2Set a threshold for the fourth, and Pe2＜Pe1；Pm2A threshold value is set for the sixth, and Pm2＜Pm1。
CN201910620485.7A 2019-07-10 2019-07-10 Refrigeration control method of fixed-frequency air conditioner under high-temperature working condition Pending CN112212473A (en)

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Application publication date: 20210112