CN110906500B - Refrigeration control method and device of air conditioner and air conditioner - Google Patents
Refrigeration control method and device of air conditioner and air conditioner Download PDFInfo
- Publication number
- CN110906500B CN110906500B CN201911266961.6A CN201911266961A CN110906500B CN 110906500 B CN110906500 B CN 110906500B CN 201911266961 A CN201911266961 A CN 201911266961A CN 110906500 B CN110906500 B CN 110906500B
- Authority
- CN
- China
- Prior art keywords
- temperature
- compressor
- air conditioner
- air
- electromagnetic valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- 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
- F24F11/62—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
- F24F11/65—Electronic processing for selecting an operating mode
-
- 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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
-
- 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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
-
- 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
- F24F11/88—Electrical aspects, e.g. circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
Landscapes
- 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)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a refrigeration control method and device of an air conditioner and the air conditioner, wherein the air conditioner comprises a bypass loop and an electromagnetic valve arranged on the bypass loop, and the method comprises the following steps: when the air conditioner operates in a normal refrigeration mode or a dehumidification mode, acquiring the outdoor environment temperature, the air inlet temperature of a compressor and the coil temperature of an evaporator; the refrigeration control method of the air conditioner judges the running condition of the air conditioner by acquiring the outdoor environment temperature, the air inlet temperature of the compressor and the coil temperature of the evaporator, controls the opening of the electromagnetic valve according to the outdoor environment temperature, the air inlet temperature of the compressor and the coil temperature of the evaporator to conduct the bypass circuit, improves the return air temperature, ensures the reliability of the compressor, further widens the lower limit temperature of the refrigeration of the air conditioner, and meets the low-temperature refrigeration requirement of a special place.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a refrigeration control method and device of an air conditioner and the air conditioner.
Background
The application range of the existing variable frequency air conditioner is wider and wider at present, in the prior art, the air conditioner is still required to have a certain refrigeration effect under the condition of low outdoor temperature aiming at special closed places with large heat productivity such as machine rooms, forging shops, communication base stations and bars, the lower limit of low-temperature refrigeration of the existing variable frequency air conditioner is generally 5 ℃, and liquid return and poor oil return can be caused due to too low return pressure when the lower limit of the low-temperature refrigeration temperature of the existing variable frequency air conditioner is lower than the lower limit of the refrigeration temperature, so that the reliability of the compressor is influenced.
Disclosure of Invention
In view of the above, the present invention is directed to a method and an apparatus for controlling cooling of an air conditioner, and an air conditioner, which are intended to solve at least one of the above problems to some extent.
In order to solve the above problems, the present invention provides a refrigeration control method for an air conditioner, the air conditioner includes a bypass circuit and an electromagnetic valve disposed in the bypass circuit, a first end of the bypass circuit is connected between the compressor and the condenser, and a second end of the bypass circuit is connected between the throttling device and the evaporator; the method comprises the following steps: when the air conditioner operates in a normal refrigeration mode or a dehumidification mode, acquiring the outdoor environment temperature, the air inlet temperature of a compressor and the coil temperature of an evaporator; and controlling the electromagnetic valve according to the outdoor environment temperature, the air inlet temperature and the coil pipe temperature so as to realize the conduction of the bypass loop.
Compared with the prior art, the refrigeration control method of the air conditioner has the following advantages:
according to the refrigeration control method of the air conditioner, the running condition of the air conditioner is judged by acquiring the outdoor environment temperature, the air inlet temperature of the compressor and the coil temperature of the evaporator, the electromagnetic valve is controlled to be opened according to the outdoor environment temperature, the air inlet temperature of the compressor and the coil temperature of the evaporator so as to conduct the bypass loop, the return air temperature is increased, the return air pressure is increased, the reliability of the compressor is ensured, the lower limit temperature of the refrigeration of the air conditioner is widened, and the low-temperature refrigeration requirement of a special place is met.
Optionally, the controlling the electromagnetic valve according to the outdoor environment temperature, the intake air temperature and the coil pipe temperature specifically includes: judging whether the outdoor environment temperature, the air inlet temperature and the coil temperature meet a first preset condition or not; and when the outdoor environment temperature, the air inlet temperature and the coil pipe temperature meet a first preset condition, controlling the electromagnetic valve to be opened to conduct the bypass loop.
The first preset condition is the operation logic set by the air conditioner when the air conditioner leaves the factory, and when the air conditioner synthesizes the outdoor environment temperature condition and the acquired air inlet temperature of the compressor and the coil temperature of the evaporator, the air conditioner controls the electromagnetic valve to open and conduct the bypass loop to preheat the air conditioner.
Optionally, the first preset condition is: the air inlet temperature of the compressor is smaller than a first preset threshold, the difference value between the air inlet temperature of the compressor and the temperature of a coil of the evaporator is smaller than or equal to a second preset threshold, and the outdoor environment temperature is smaller than or equal to a third preset value.
Under refrigeration mode or dehumidification mode, the back is opened to the solenoid valve, has the high temperature refrigerant of a part compressor gas vent exhaust directly to mix with the refrigerant after the throttle, has reduced the refrigeration ability, can reduce refrigeration effect under the conventional operating mode, so need low temperature refrigeration operating mode down the time the inlet air temperature lower just open the solenoid valve very much.
Optionally, after the step of controlling the solenoid valve according to the outdoor environment temperature, the intake air temperature and the coil temperature to achieve the conduction of the bypass circuit, the method further includes the following steps: acquiring the inlet pressure of the compressor and the exhaust pressure of the compressor; and controlling the electromagnetic valve according to the inlet pressure of the compressor and the exhaust pressure of the compressor to realize the disconnection of the bypass circuit.
After the air conditioner is preheated for a period of time, as part of high-temperature refrigerant is directly mixed into the return air refrigerant, the pressure of the return air refrigerant is gradually increased, so that the compression ratio of the compressor is gradually reduced, when the compression ratio of the compressor is lower than the lowest compression ratio, the compressor is unstable in operation, in order to maintain the stable operation of the compressor, the air inlet pressure and the air exhaust pressure of the compressor need to be acquired at the moment, and the corresponding action control is carried out on the electromagnetic valve according to the acquired result.
Optionally, the controlling the electromagnetic valve according to the intake pressure and the exhaust pressure specifically includes: judging whether the air inlet pressure of the compressor and the exhaust pressure of the compressor meet a second preset condition or not; and when the air inlet pressure of the compressor and the exhaust pressure of the compressor meet the second preset condition, controlling the electromagnetic valve to be closed to disconnect the bypass loop.
The second preset condition is the operation logic set by the air conditioner when leaving the factory, and in order to ensure the stable operation of the compressor, when the air inlet pressure of the compressor 1 and the exhaust pressure of the compressor meet the second preset condition, the air conditioner closes the electromagnetic valve and stops preheating.
Optionally, the second preset condition is: the ratio of the discharge pressure of the compressor to the intake pressure of the compressor is less than the minimum compression ratio of the compressor.
After the electromagnetic valve is opened, as part of high-temperature refrigerant is directly mixed into the return air refrigerant, the pressure of the return air refrigerant is gradually increased, the compression ratio of the compressor is gradually reduced, when the compression ratio of the compressor is lower than the lowest compression ratio, the compressor is unstable in operation, in order to maintain the stable operation of the compressor, when the compression ratio of the compressor is lower than the minimum compression ratio of the specification of the compressor, the electromagnetic valve is closed, and the bypass loop is disconnected, so that the normal operation of the compressor is ensured.
Optionally, the minimum compression ratio of the compressor and the operating frequency of the compressor satisfy the following relation: when 12 is less than or equal to b is less than or equal to 30, a is (2/25) b-2/5; when 30 is less than or equal to b, a is 2; wherein a is the minimum compression ratio of the compressor, and b is the operating frequency of the compressor.
According to the operating frequency of the different compressors, the minimum compression ratio of the air conditioner to be logically judged according to the compressors is different, so that the inverter air conditioner can be accurately controlled, and the user experience is improved.
A refrigeration control apparatus of an air conditioner, comprising: the system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the outdoor environment temperature, the air inlet temperature of a compressor and the coil temperature of an evaporator; and the control unit is used for controlling the electromagnetic valve to be opened according to the outdoor environment temperature, the air inlet temperature of the compressor and the coil temperature of the evaporator so as to conduct the bypass loop.
The control unit carries out corresponding control action on the electromagnetic valve according to the result obtained by the obtaining unit, so that the air conditioner can run stably under various environmental conditions, and the user experience is improved.
An air conditioner includes a computer readable storage medium storing a computer program and a processor, wherein the computer program is read by the processor and executed to implement the cooling control method of the air conditioner.
Compared with the prior art, the air conditioner and the refrigeration control device of the air conditioner have the same advantages, and are not described again.
Optionally, the system further comprises a compressor, a condenser, a throttling device and an evaporator which are connected end to end through pipelines in sequence to form a loop; a bypass circuit, a first end of which is connected to a line between the compressor and the condenser, and a second end of which is connected to a line between the throttling device and the evaporator; and the electromagnetic valve is arranged on the bypass loop and used for controlling the on-off of the bypass loop.
The refrigerant discharged by the compressor can preheat the air conditioner so that the air conditioner can be normally started, normal refrigerant circulation of the air conditioner is not affected, and the air conditioner is preheated and the refrigerant circulates in the air conditioner synchronously, so that the air conditioner can adapt to lower environmental temperature and work reliably.
Drawings
Fig. 1 is a schematic flow chart illustrating an embodiment of a refrigeration control method of an air conditioner according to the present invention;
fig. 2 is a schematic structural diagram of an embodiment of an air conditioner according to the present invention.
Description of reference numerals:
1. the system comprises a compressor, 2, a condenser, 3, a throttling device, 4, an evaporator, 5, a bypass circuit, 6, an electromagnetic valve, 7, a four-way valve, 71, a first interface, 72, a second interface, 73, a third interface, 74, a fourth interface, 8, a low-pressure stop valve, 9, a high-pressure stop valve, 10 and a gas-liquid separator.
Detailed Description
The application range of the existing variable frequency air conditioner is wider and wider at present, in the prior art, the air conditioner is still required to have a certain refrigeration effect under the condition of low outdoor temperature aiming at special closed places with large heat productivity such as machine rooms, forging shops, communication base stations and bars, the lower limit of low-temperature refrigeration of the existing variable frequency air conditioner is generally 5 ℃, and liquid return and poor oil return can be caused due to too low return pressure when the lower limit of the low-temperature refrigeration temperature of the existing variable frequency air conditioner is lower than the lower limit of the refrigeration temperature, so that the reliability of the compressor is influenced.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1, an embodiment of the present invention provides a refrigeration control method for an air conditioner, where the air conditioner includes a bypass circuit 5, a first end of the bypass circuit 5 is connected to a pipeline between the compressor 1 and the condenser 2, and a second end of the bypass circuit 5 is connected to a pipeline between the throttling device 3 and the evaporator 4; and the electromagnetic valve 6, the said electromagnetic valve 6 is set in said bypass circuit 5, the said electromagnetic valve 6 is used for controlling the make-and-break of the said bypass circuit 5, including the following step:
s10, when the air conditioner operates in a normal refrigeration mode or a dehumidification mode, acquiring the outdoor environment temperature, the air inlet temperature of the compressor 1 and the coil temperature of the evaporator 4;
it should be noted that, the opening and closing control of the electromagnetic valve is only performed in the cooling mode or the dehumidification mode, and in the heating mode, if the electromagnetic valve is opened, the high-temperature refrigerant of the compressor is mixed with the condensed medium-temperature refrigerant, which affects the refrigerant circulation in the cooling system, so that the electromagnetic valve can only be opened in the cooling mode or the dehumidification mode, the operation condition of the air conditioner is judged by obtaining the outdoor environment temperature, the inlet air temperature of the compressor and the coil temperature of the evaporator, and data support is provided for the next action of the air conditioner.
And S20, controlling the electromagnetic valve 6 according to the outdoor environment temperature, the air inlet temperature and the coil pipe temperature to realize the conduction of the bypass circuit 5.
The air conditioner synthesizes the outdoor environment temperature condition, the acquired air inlet temperature of the compressor and the coil temperature of the evaporator, performs logical operation, and controls the electromagnetic valve to open and conduct the bypass loop to preheat the air conditioner according to the outdoor environment temperature condition, the acquired air inlet temperature of the compressor and the coil temperature of the evaporator.
The control solenoid valve 6 according to the outdoor environment temperature, the inlet air temperature and the coil pipe temperature specifically includes: judging whether the outdoor environment temperature, the air inlet temperature and the coil temperature meet a first preset condition or not; when the outdoor environment temperature, the intake air temperature and the coil temperature meet a first preset condition, the control electromagnetic valve 6 is opened to conduct the bypass loop 5.
The first preset condition is the operation logic set by the air conditioner when the air conditioner leaves the factory, and when the air conditioner synthesizes the outdoor environment temperature condition and the acquired air inlet temperature of the compressor and the coil temperature of the evaporator, the air conditioner controls the electromagnetic valve to open and conduct the bypass loop to preheat the air conditioner.
The first preset condition is as follows: the air inlet temperature of the compressor 1 is smaller than a first preset threshold, the difference value between the air inlet temperature of the compressor 1 and the temperature of the coil of the evaporator 4 is smaller than or equal to a second preset threshold, and the outdoor environment temperature is smaller than or equal to a third preset value.
In the refrigeration mode or the dehumidification mode, after the electromagnetic valve is opened, a part of high-temperature refrigerant discharged from the exhaust port of the compressor is directly mixed with the throttled refrigerant, so that the refrigeration capacity is reduced, the refrigeration effect is reduced under the conventional working condition, and the electromagnetic valve is opened when the air inlet temperature is low under the low-temperature refrigeration working condition; in this embodiment, the first preset threshold is [ -1,1] ° c, and the threshold is a range value obtained by low-temperature refrigeration capacity non-attenuation experimental simulation when the external ambient temperature is-15 ℃, and different refrigeration capacity models have differences.
The second preset threshold value is [ -1,2] ° C, the threshold value is the lowest external environment temperature of low-temperature refrigeration operation of-15 ℃, the continuous operation is carried out for 6 hours, the oil return and liquid return experiment is just obtained from a simulation value without problems, different refrigerating capacity machine types have some differences, and the threshold value is set for protecting the reliability of the compressor.
The third preset value is 5 ℃, the low-temperature refrigerating capacity can be influenced after the electromagnetic valve is opened, and the conventional machine type can meet the working condition of more than 5 ℃.
Meanwhile, the condition is met, so that the lower limit of the low-temperature refrigeration operation can be widened under the condition that the reliability of the compressor is ensured and the performance under the conventional state is not influenced.
The invention reasonably controls the electromagnetic valve by integrating the outdoor environment temperature condition, the acquired inlet air temperature of the compressor and the acquired coil temperature of the evaporator, thereby meeting the low-temperature refrigeration requirements of customers to the maximum extent and ensuring the refrigeration effect under different scenes.
After the step of controlling the electromagnetic valve 6 according to the outdoor environment temperature, the intake air temperature of the compressor 1 and the coil temperature of the evaporator 4 to realize the conduction of the bypass circuit 5, the method further comprises the following steps: acquiring the air inlet pressure of the compressor 1 and the exhaust pressure of the compressor 1; the solenoid valve 6 is controlled according to the intake pressure of the compressor 1 and the discharge pressure of the compressor 1 to achieve disconnection of the bypass circuit 5.
After the air conditioner is preheated for a period of time, as part of high-temperature refrigerant is directly mixed into the return air refrigerant, the pressure of the return air refrigerant is gradually increased, so that the compression ratio of the compressor is gradually reduced, when the compression ratio of the compressor is lower than the lowest compression ratio, the compressor is unstable in operation, in order to maintain the stable operation of the compressor, the air inlet pressure and the air exhaust pressure of the compressor need to be acquired at the moment, and the corresponding action control is carried out on the electromagnetic valve according to the acquired result.
Controlling the solenoid valve 6 according to the intake pressure of the compressor 1 and the discharge pressure of the compressor 1 specifically includes: judging whether the air inlet pressure of the compressor 1 and the exhaust pressure of the compressor 1 meet a second preset condition or not; when the inlet pressure of the compressor 1 and the exhaust pressure of the compressor 1 meet a second preset condition, the electromagnetic valve 6 is controlled to be closed to disconnect the bypass circuit 5.
The second preset condition is an operation logic set by the air conditioner when the air conditioner leaves the factory, and in order to ensure the stable operation of the compressor, when the air inlet pressure of the compressor 1 and the exhaust pressure of the compressor 1 accord with the second preset condition, the air conditioner closes the electromagnetic valve and stops preheating.
In addition, the compression ratio of the compressor is controlled according to the specification requirement of the compressor, the compressor is unstable in operation in order to meet the low-temperature refrigeration operable limit to the maximum extent, the compression ratio is lower than the lowest compression ratio, the operation reliability of the compressor can be ensured, the return air pressure reaches the maximum value of the specification requirement when the electromagnetic valve is closed through the compression ratio control, the return air pressure is gradually reduced to the minimum value when the electromagnetic valve is opened, the maximum period is basically achieved, frequent switching of the electromagnetic valve is avoided, and the air conditioner is more stable in operation.
The second preset condition is as follows: the ratio of the discharge pressure of the compressor 1 to the intake pressure of the compressor 1 is smaller than the minimum compression ratio of the compressor 1.
After the electromagnetic valve is opened, as part of high-temperature refrigerant is directly mixed into the return air refrigerant, the pressure of the return air refrigerant is gradually increased, the compression ratio of the compressor is gradually reduced, when the compression ratio of the compressor is lower than the lowest compression ratio, the compressor is unstable in operation, in order to maintain the stable operation of the compressor, when the compression ratio of the compressor is lower than the minimum compression ratio of the specification of the compressor, the electromagnetic valve is closed, and the bypass loop is disconnected, so that the normal operation of the compressor is ensured.
The minimum compression ratio of the compressor and the operating frequency of the compressor satisfy the following relation: when 12 is less than or equal to b is less than or equal to 30, a is (2/25) b-2/5; when 30 is less than or equal to b, a is 2; where a is the minimum compression ratio of the compressor and b is the operating frequency of the compressor in rps.
When the operating frequency of the compressor is [12,30] rps, the minimum compression ratio of the compressor is [1.2,2] and is linearly related, and the relation is satisfied: a is (2/25) b-2/5, specifically, when the operating frequency of the compressor is 12rps, the minimum compression ratio of the compressor is 1.2, when the operating frequency of the compressor is 30rps, the minimum compression ratio of the compressor is 2, when the operating frequency of the compressor is [30,120] rps, the minimum compression ratio of the compressor is 2, and according to the operating frequencies of different compressors, the minimum compression ratio judged by the air conditioner logic at this time according to the compressor is also different, so that the inverter air conditioner is controlled more accurately, and user experience is improved.
Another embodiment of the present invention provides a refrigeration control apparatus of an air conditioner, including: an acquisition unit for acquiring an outdoor ambient temperature, an intake air temperature of the compressor 1, and a coil temperature of the evaporator 4; and the control unit is used for controlling the electromagnetic valve 6 to be opened to conduct the bypass loop 5 according to the outdoor environment temperature, the air inlet temperature of the compressor 1 and the coil temperature of the evaporator 4, and carrying out corresponding control action on the electromagnetic valve according to the result obtained by the obtaining unit, so that the air conditioner is ensured to run stably under various environment conditions, and the user experience is improved.
The acquisition unit includes: the first temperature sensor is arranged on the shell of the condenser 2 and used for acquiring the outdoor environment temperature; the second temperature sensor is arranged on the coil of the evaporator 4 and used for acquiring the temperature of the coil of the evaporator 4; the third temperature sensor is arranged at an air inlet of the compressor 1 and used for acquiring the air inlet temperature of the compressor 1; the first pressure sensor is arranged at the exhaust port of the compressor 1 and used for acquiring the exhaust pressure of the compressor 1; and the second pressure sensor is arranged at the air inlet of the compressor 1 and used for acquiring the air inlet pressure of the compressor 1, and each sensor can acquire the temperature information and the pressure information of the air-conditioning part timely and accurately, so that the controller can further perform on-off control on the electromagnetic valve according to the pressure condition of the thermometer of each air-conditioning part.
Another embodiment of the present invention provides an air conditioner, including a computer readable storage medium storing a computer program and a processor, wherein the computer program is read and executed by the processor to implement the cooling control method of the air conditioner.
As shown in fig. 2, an air conditioner further includes: the system comprises a compressor 1, a condenser 2, a throttling device 3 and an evaporator 4 which are sequentially connected end to end through pipelines to form a loop; a bypass circuit 5, a first end of the bypass circuit 5 is connected to a pipeline between the compressor 1 and the condenser 2, and a second end of the bypass circuit 5 is connected to a pipeline between the throttling device 3 and the evaporator 4; the electromagnetic valve 6, the electromagnetic valve 6 is arranged on the bypass circuit 5, the control unit is electrically connected with the acquisition unit and the electromagnetic valve 6, the electromagnetic valve 6 is used for controlling the on-off of the bypass circuit 5, and as can be understood, when the electromagnetic valve is closed, the bypass circuit is in an open circuit, the air conditioner operates by a normal refrigerant circulation route, namely, the high-temperature refrigerant discharged by the compressor sequentially passes through the condenser, the throttling device and the evaporator and then returns to the compressor to complete a circulation route, when the electromagnetic valve is opened, the bypass loop is a passage, the compressor, the bypass loop and the evaporator form a new working loop, that is, while the refrigerant discharged from the compressor 1 is condensed by the condenser 2 to release heat, a part of the refrigerant discharged from the compressor 1 flows through the bypass circuit 5 and the evaporator 4 in this order, and then flows back into the compressor 1 to be compressed. Therefore, the air conditioner can be preheated by the refrigerant discharged by the compressor 1, so that the air conditioner can be normally started, the normal refrigerant circulation of the air conditioner is not influenced, the air conditioner preheating and the refrigerant circulation in the air conditioner are synchronously carried out, and the air conditioner can adapt to lower environmental temperature and work reliably.
According to the air conditioner, the bypass loop is additionally arranged in the air conditioner, the electromagnetic valve is arranged on the bypass loop, the return air temperature in a low-temperature refrigeration state is improved by controlling the on-off of the electromagnetic valve under the condition that the outside environment temperature is low, the return air pressure is further improved, the reliability of the compressor is guaranteed, the lower limit temperature of air-conditioning refrigeration is further widened, the lower limit temperature can be increased to about-15 ℃, the low-temperature refrigeration requirement of a special place is met, in addition, the bypass loop and the electromagnetic valve are only additionally arranged in the air conditioner, the equipment is simple and independent, the operation is easy, and the product experience and the product added value are improved.
The air conditioner further comprises a four-way valve 7, wherein a first interface 71 of the four-way valve 7 is connected with an outlet of the evaporator 4, a second interface 72 of the four-way valve 7 is connected with an air inlet of the compressor 1, a third interface 73 of the four-way valve 7 is connected with an inlet of the condenser 2, a fourth interface 74 of the four-way valve 7 is connected with an air outlet of the compressor 1, and different circulation routes of refrigerants in a refrigerating mode and a heating mode of the air conditioner are controlled by controlling the communication condition of the four interfaces of the four-way valve 7.
The four-way valve 7 controls the air conditioner to run in a cooling mode or a heating mode through direction change switching, and the air conditioner changes the flow direction of a refrigerant in a system pipeline through the four-way valve to realize the interconversion between cooling and heating.
When the air conditioner operates in the cooling mode, the fourth interface 74 of the four-way valve 7 is communicated with the third interface 73 of the four-way valve 7, and the first interface 71 of the four-way valve 7 is communicated with the second interface 72 of the four-way valve 7, so that the route circulation of a refrigerant of the air conditioner in the cooling mode is realized.
When the air conditioner operates in the heating mode, the first interface 71 of the four-way valve 7 is communicated with the fourth interface 74 of the four-way valve 7, and the third interface 73 of the four-way valve 7 is communicated with the second interface 72 of the four-way valve 7, so that the refrigerant is circulated in a route in the heating mode of the air conditioner.
When the air conditioner operates in a cooling mode, a refrigerant is changed into high-temperature and high-pressure gas under the action of the compressor 7, the high-temperature and high-pressure gas enters the condenser through the fourth interface 74 and the third interface 73 of the four-way valve 7, is condensed to release heat, is cooled into medium-temperature and high-pressure liquid, flows out of the condenser, is changed into low-temperature and low-pressure liquid through the throttling device, enters the evaporator, is changed into medium-temperature and low-pressure gas through evaporation and heat absorption in the evaporator, and then enters the compressor 1 through the first interface 71, the second interface 72 and the gas-liquid separator of the four-way valve 7 in sequence, so that the circulation is realized, and the indoor cooling function is completed.
When the air conditioner operates in a heating mode, a refrigerant is changed into high-temperature and high-pressure gas under the action of the compressor 7, the high-temperature and high-pressure gas flows through the fourth interface 74 and the first interface 71 of the four-way valve 7 to enter the evaporator, the heat is condensed to heat indoor air, the high-temperature and high-pressure gas is cooled into medium-temperature and high-pressure liquid, the medium-temperature and high-pressure liquid flows out of the evaporator, the low-temperature and low-pressure liquid is changed into low-temperature and low-pressure liquid through the throttling device to enter the condenser, the medium-temperature and low-pressure gas is changed into medium-temperature and low-pressure gas through evaporation and heat absorption in the condenser, and the medium-temperature and low-pressure gas sequentially passes through the third interface 73 and the second interface 72 of the four-way valve 7 and the gas-liquid separator to enter the compressor 1, so that the indoor heating function is completed through circulation.
During the operation of the air conditioner, the refrigerant can not be completely vaporized; in other embodiments, an accumulator can be arranged in front of an air inlet of the compressor, since the unvaporized liquid refrigerant is heavier than gas and directly falls on the bottom of the accumulator cylinder, the vaporized refrigerant enters the compressor from an outlet of the accumulator, and liquid impact caused by the liquid refrigerant sucked by the compressor is prevented. According to the actual use needs, the air conditioning system with large capacity needs to be provided with a liquid storage device, the air conditioning system with the refrigerating capacity smaller than 30KW does not need to be provided with the liquid storage device, and the volume of a gas-liquid separator of the air conditioning system without the liquid storage device needs to be designed slightly larger.
The air conditioner further comprises a low-pressure stop valve 8, one end of the low-pressure stop valve 8 is connected with an outlet of the evaporator 4, the other end of the low-pressure stop valve 8 is connected with the first interface 71 of the four-way valve 7, the low-pressure stop valve protects the air conditioner at low pressure, when the pressure in a pipeline of the air conditioner is too low, the low-pressure stop valve is timely disconnected, and the refrigerant of the air conditioner stops circulating.
The air conditioner further comprises a high-pressure stop valve 9, one end of the high-pressure stop valve 9 is connected with an inlet of the evaporator 4, the other end of the high-pressure stop valve 9 is connected with an outlet of the throttling device 3, the high-pressure stop valve protects the air conditioner at high pressure, when the pressure in the pipeline of the air conditioner is too high, the high-pressure stop valve is timely disconnected, and the refrigerant of the air conditioner stops circulating.
The air conditioner further comprises a gas-liquid separator 10, wherein the air inlet of the gas-liquid separator 10 is connected with the second interface 72 of the four-way valve 7, the air outlet of the gas-liquid separator 10 is connected with the air inlet of the compressor 1, and the gas-liquid separator 10 can prevent the air inlet of the compressor 1 from sucking liquid refrigerant to generate liquid impact to damage the compressor 1, so that the compressor 1 is further protected.
The outside of the evaporator is provided with a fan, the fan blows cold air or hot air around the evaporator to the indoor space, forced convection is carried out, the indoor temperature is reduced or increased, and the purpose of quickly adjusting the air temperature is achieved.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A refrigeration control method of an air conditioner is characterized by comprising a bypass loop (5) and an electromagnetic valve (6) arranged in the bypass loop (5), wherein a first end of the bypass loop (5) is connected between a compressor (1) and a condenser (2), and a second end of the bypass loop (5) is connected between a throttling device (3) and an evaporator (4); the method comprises the following steps:
when the air conditioner runs in a normal refrigeration mode or a dehumidification mode, acquiring the outdoor environment temperature, the air inlet temperature of the compressor (1) and the coil temperature of the evaporator (4);
controlling the electromagnetic valve (6) according to the outdoor environment temperature, the air inlet temperature and the coil pipe temperature to realize the conduction of the bypass loop (5);
the control according to outdoor ambient temperature, inlet air temperature and coil pipe temperature solenoid valve (6) specifically include:
judging whether the outdoor environment temperature, the air inlet temperature and the coil temperature meet a first preset condition or not; when the outdoor environment temperature, the air inlet temperature and the coil temperature meet the first preset condition, controlling the electromagnetic valve (6) to be opened to conduct the bypass loop (5);
the first preset condition is as follows: the inlet air temperature is less than a first preset threshold, the difference between the inlet air temperature and the coil pipe temperature is less than or equal to a second preset threshold, and the outdoor environment temperature is less than or equal to a third preset threshold.
2. A refrigeration control method of an air conditioner according to claim 1, characterized by further comprising, after said step of controlling said solenoid valve (6) to effect conduction of said bypass circuit (5) according to said outdoor ambient temperature, said intake air temperature and said coil temperature, the steps of:
acquiring the air inlet pressure and the exhaust pressure of a compressor (1);
-controlling the solenoid valve (6) in dependence of the intake pressure and the exhaust pressure to effect disconnection of the bypass circuit (5).
3. A cooling control method of an air conditioner according to claim 2, wherein said controlling the solenoid valve (6) according to the intake pressure and the exhaust pressure specifically comprises:
judging whether the air inlet pressure and the exhaust pressure meet a second preset condition or not;
when the intake pressure and the exhaust pressure meet the second preset condition, controlling the electromagnetic valve (6) to be closed to disconnect the bypass circuit (5).
4. A refrigeration control method of an air conditioner according to claim 3, wherein the second preset condition is:
the ratio of the discharge pressure to the intake pressure is less than the minimum compression ratio of the compressor (1).
5. A refrigeration control method of an air conditioner according to claim 4, wherein the minimum compression ratio and the operation frequency of the compressor satisfy the following relation:
when 12 is less than or equal to b is less than or equal to 30, a is (2/25) b-2/5;
when 30 is less than or equal to b, a is 2;
wherein a is the minimum compression ratio of the compressor, and b is the operating frequency of the compressor.
6. A refrigeration control apparatus of an air conditioner, comprising: an acquisition unit for acquiring an outdoor ambient temperature, an intake air temperature of the compressor (1) and a coil temperature of the evaporator (4); the control unit is specifically used for judging whether the outdoor environment temperature, the air inlet temperature and the coil temperature meet a first preset condition or not; when the outdoor environment temperature, the air inlet temperature and the coil pipe temperature meet the first preset condition, controlling an electromagnetic valve (6) to be opened to conduct a bypass loop (5); the first preset condition is as follows: the inlet air temperature is less than a first preset threshold, the difference between the inlet air temperature and the coil pipe temperature is less than or equal to a second preset threshold, and the outdoor environment temperature is less than or equal to a third preset threshold.
7. An air conditioner comprising a computer-readable storage medium storing a computer program and a processor, wherein the computer program is read by the processor and executed to implement the cooling control method of the air conditioner according to any one of claims 1 to 5.
8. The air conditioner according to claim 7, further comprising:
a compressor (1), a condenser (2), a throttling device (3) and an evaporator (4) which are connected in sequence to form a loop;
a bypass circuit (5), a first end of the bypass circuit (5) being connected between the compressor (1) and the condenser (2), a second end of the bypass circuit (5) being connected between the throttling device (3) and the evaporator (4);
the electromagnetic valve (6) is arranged on the bypass loop (5), and the electromagnetic valve (6) is used for controlling the on-off of the bypass loop (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911266961.6A CN110906500B (en) | 2019-12-11 | 2019-12-11 | Refrigeration control method and device of air conditioner and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911266961.6A CN110906500B (en) | 2019-12-11 | 2019-12-11 | Refrigeration control method and device of air conditioner and air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110906500A CN110906500A (en) | 2020-03-24 |
| CN110906500B true CN110906500B (en) | 2021-07-30 |
Family
ID=69824696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911266961.6A Active CN110906500B (en) | 2019-12-11 | 2019-12-11 | Refrigeration control method and device of air conditioner and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110906500B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111442577A (en) * | 2020-04-09 | 2020-07-24 | 宁波奥克斯电气股份有限公司 | Air conditioner, low-temperature refrigeration control method thereof and computer readable storage medium |
| CN111811112B (en) * | 2020-07-13 | 2021-11-16 | 南京天加环境科技有限公司 | Intelligent oil return multi-split air conditioner system |
| CN112432340B (en) * | 2020-11-26 | 2021-11-26 | 珠海格力电器股份有限公司 | Control method and control device of air conditioner, processor and air conditioning system |
| CN113137714B (en) * | 2021-03-15 | 2022-07-22 | 珠海格力电器股份有限公司 | Air conditioner, oil return control method and device for compressor of air conditioner and storage medium |
| CN113375273B (en) * | 2021-06-24 | 2022-04-19 | 宁波奥克斯电气股份有限公司 | Compressor frequency control method and device and air conditioner |
| CN113606738B (en) * | 2021-08-18 | 2022-10-28 | 宁波奥克斯电气股份有限公司 | Air conditioner control method, air conditioner and computer readable storage medium |
| CN113834202B (en) * | 2021-09-06 | 2023-04-25 | 美的集团武汉暖通设备有限公司 | Air conditioner control method, air conditioner and storage medium |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6273471B2 (en) * | 2014-01-07 | 2018-02-07 | オリオン機械株式会社 | Temperature control device |
| KR102435203B1 (en) * | 2015-10-20 | 2022-08-24 | 삼성전자주식회사 | Air conditioner and control method thereof |
| JP2017146061A (en) * | 2016-02-19 | 2017-08-24 | 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． | Air conditioner |
| CN208254012U (en) * | 2018-05-18 | 2018-12-18 | 珠海格力电器股份有限公司 | A kind of heat pump system |
| CN109458701A (en) * | 2018-11-29 | 2019-03-12 | 合肥天鹅制冷科技有限公司 | A kind of air-conditioning with defrosting function |
-
2019
- 2019-12-11 CN CN201911266961.6A patent/CN110906500B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110906500A (en) | 2020-03-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110906500B (en) | Refrigeration control method and device of air conditioner and air conditioner | |
| CN111023401B (en) | Dehumidification control method of air conditioner and air conditioner | |
| US9719708B2 (en) | Air-conditioning apparatus with simultaneous heating and cooling operation | |
| CN110553440B (en) | Multi-split system, liquid impact prevention control method and device and readable storage medium | |
| US10955160B2 (en) | Air conditioner including a plurality of utilization units connected in parallel to a heat source unit | |
| CN109869941B (en) | Heat pump system, air suction superheat degree and vapor-liquid separator accumulated liquid evaporation control method | |
| CN113432264A (en) | Refrigerant circulation system, method for controlling air conditioner to dehumidify and air conditioner | |
| CN106895623A (en) | Air-conditioner and its delivery temperature control method | |
| CN113432261A (en) | Refrigerant circulation system, method for controlling air conditioner to dehumidify and air conditioner | |
| CN208765303U (en) | Air-conditioning system | |
| CN106949657B (en) | Air conditioning system with supercooling device and control method thereof | |
| CN111271831B (en) | Air conditioning system, and operation control method and device of air conditioning system | |
| CN111271832B (en) | Air conditioning system, and operation control method and device of air conditioning system | |
| CN109163469B (en) | Air conditioning system and control method thereof | |
| CN111043723A (en) | Air conditioner and control method thereof | |
| US20220128275A1 (en) | Refrigeration apparatus | |
| CN115143658A (en) | Double-working-condition water chilling unit and control method thereof | |
| CN113091236B (en) | Air conditioner liquid impact protection method and device and air conditioner | |
| KR101769821B1 (en) | Air conditioner and Controlling method for the same | |
| KR100885566B1 (en) | Controlling method for air conditioner | |
| CN109237645B (en) | Air conditioning system and control method thereof | |
| CN110220258B (en) | Air conditioning system, and operation control method and device of air conditioning system | |
| CN106322558B (en) | Multi-split air conditioner system, outdoor unit of multi-split air conditioner system, and defrosting control method and device | |
| JP6865111B2 (en) | Heat pump device | |
| CN117346250B (en) | Double-working-condition air conditioning unit and control method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |