CN105004116A - Outdoor unit of air conditioner and refrigerant filling control method of air conditioner - Google Patents
Outdoor unit of air conditioner and refrigerant filling control method of air conditioner Download PDFInfo
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- CN105004116A CN105004116A CN201510402416.0A CN201510402416A CN105004116A CN 105004116 A CN105004116 A CN 105004116A CN 201510402416 A CN201510402416 A CN 201510402416A CN 105004116 A CN105004116 A CN 105004116A
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- air conditioner
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- 239000003507 refrigerant Substances 0.000 title claims abstract description 315
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004781 supercooling Methods 0.000 claims description 23
- 238000004378 air conditioning Methods 0.000 claims description 19
- 238000005057 refrigeration Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 abstract description 12
- 238000012423 maintenance Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 7
- 238000013507 mapping Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/26—Refrigerant piping
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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
- F24F11/89—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B45/00—Arrangements for charging or discharging refrigerant
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an outdoor unit of an air conditioner. The outdoor unit of the air conditioner comprises a compressor, an outdoor heat exchanger, a low-pressure tank and a controller, and further comprises a refrigerant filling pipeline, wherein one end of the refrigerant filling pipeline is connected with an inlet of the low-pressure tank, and the other end is used for connecting with a refrigerant storage tank; a filling switch is arranged on the refrigerant filling pipeline; and the controller controls the opening of the filling switch under the refrigerating operation of the compressor, and controls the closing of the filling switch when determining sufficient refrigerant of a refrigerant circulating system of the air conditioner. The invention further discloses a refrigerant filling control method of the air conditioner. The outdoor unit of the air conditioner and the refrigerant filling control method of the air conditioner enable the adding quantity of refrigerant to be accurate in the installation completion or the maintenance of the air conditioner, and guarantee the reliability and the use effect of the air conditioner.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to an air conditioner outdoor unit and a refrigerant filling control method of an air conditioner.
Background
The air conditioner generally needs to add a part of refrigerant to the whole air conditioning system according to actual conditions after installation, or needs to add refrigerant to the whole system after the system refrigerant is discharged due to maintenance. At present, most manufacturers calculate the addition amount of a pipe according to the pipe length after the specified pipe diameter corresponds to the addition amount of a unit refrigerant, and add the addition amount of the outdoor unit with the refrigerant and the additional addition amount. However, for many projects, due to the reasons of lost drawings, irregular installation or difference in installation and design, the amount of refrigerant actually added by the air conditioner is inconsistent with the amount of refrigerant actually required, which seriously affects the use effect and service life of the air conditioning system.
Disclosure of Invention
The invention mainly aims to provide an air conditioner outdoor unit and a refrigerant filling control method of an air conditioner, and aims to solve the technical problem that the service effect and the service life of an air conditioning system are seriously influenced because the quantity of additional refrigerants cannot be ensured to be consistent with the actually required refrigerants in the prior art.
In order to achieve the purpose, the invention provides an air conditioner outdoor unit, which comprises a compressor, an outdoor heat exchanger, a low-pressure tank and a controller, wherein the air conditioner outdoor unit further comprises a refrigerant filling pipeline, one end of the refrigerant filling pipeline is connected with an inlet of the low-pressure tank, and the other end of the refrigerant filling pipeline is used for being connected with a refrigerant storage tank; a filling switch is arranged on the refrigerant filling pipeline; the controller controls the filling switch to be opened under the refrigeration operation of the compressor, and controls the filling switch to be closed when the refrigerant of the air conditioner refrigerant circulating system is sufficient.
Preferably, the controller determines whether the refrigerant in the air-conditioning refrigerant circulation system is sufficient according to a comparison result between the refrigerant pressure at the air outlet of the compressor and a preset maximum pressure corresponding to the outdoor environment temperature.
Preferably, the controller determines whether the refrigerant of the air conditioner refrigerant circulation system is sufficient according to the degree of supercooling of the outlet of the outdoor heat exchanger when the pressure of the refrigerant at the air outlet of the compressor is less than a preset maximum pressure corresponding to the outdoor environment temperature.
Preferably, after the refrigerant charging pipeline is connected with the refrigerant storage tank, if the refrigerant equilibrium pressure of the air-conditioning refrigerant circulation system is less than the preset minimum starting pressure corresponding to the outdoor environment temperature, the controller controls the charging switch to be turned on until the refrigerant equilibrium pressure of the air-conditioning refrigerant circulation system is greater than or equal to the preset minimum starting pressure corresponding to the outdoor environment temperature, and controls the compressor to be turned on and perform refrigeration operation.
Preferably, the charge switch comprises a solenoid valve and a pressure relief valve, and the solenoid valve and the pressure relief valve are arranged in parallel.
Preferably, the charge switch comprises an electronic expansion valve.
Preferably, a filter screen is further arranged on the refrigerant filling pipeline, and the filter screen is arranged at the other end of the refrigerant filling pipeline.
Preferably, the other end of the refrigerant filling line is further used for connecting a stop valve when the refrigerant storage tank is not connected.
In addition, in order to achieve the purpose, the invention also provides a refrigerant filling control method of the air conditioner, which is applied to the air conditioner of the air conditioner outdoor unit, and a refrigerant filling pipeline in the air conditioner outdoor unit is communicated with the refrigerant storage tank; the refrigerant filling control method comprises the following steps:
s1, controlling the compressor to operate for a first preset time;
s2, judging whether the refrigerant of the air conditioner outdoor unit is sufficient;
s3, stopping filling the refrigerant when the refrigerant of the air-conditioning refrigerant circulating system is sufficient;
s4, when the refrigerant of the air-conditioning refrigerant circulation system is insufficient, the charge switch is controlled to be opened for a first preset time, and the process goes to step S2.
Preferably, the step S2 includes:
determining whether the refrigerant of the air conditioner refrigerant circulating system is sufficient or not according to the comparison result of the refrigerant pressure of the air outlet of the compressor and the preset highest pressure corresponding to the outdoor environment temperature; or,
and when the pressure of the refrigerant at the air outlet of the compressor is lower than the preset highest pressure corresponding to the outdoor environment temperature, judging whether the refrigerant of the air-conditioning refrigerant circulating system is sufficient according to the degree of supercooling of the outlet of the outdoor heat exchanger.
Preferably, the step S1 is preceded by:
after the refrigerant filling pipeline is connected with the refrigerant storage tank, if the refrigerant balance pressure of the air-conditioning refrigerant circulating system is smaller than the preset minimum starting pressure corresponding to the outdoor environment temperature, the filling switch is controlled to be opened until the refrigerant balance pressure of the air-conditioning refrigerant circulating system is larger than or equal to the preset minimum starting pressure corresponding to the outdoor environment temperature.
According to the embodiment of the invention, the refrigerant filling pipeline is arranged at the inlet of the low-pressure tank of the outdoor unit of the air conditioner, so that the refrigerant filling is easier, and the filled refrigerant can quickly flow back to the compressor; meanwhile, the controller is utilized to determine the actual demand of the refrigerant, and the filling switch on the refrigerant filling pipeline is controlled according to the actual demand, so that the refrigerant is accurately filled, the refrigerant adding amount of the air conditioner is accurate after the air conditioner is installed or maintained, the reliability and the using effect of the air conditioner are ensured, the refrigerant calculation process of installation and maintenance is reduced, and the workload of installation and maintenance is reduced.
Drawings
Fig. 1 is a schematic structural view of an outdoor unit of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of an outdoor unit of an air conditioner according to another embodiment of the present invention;
fig. 3 is a schematic structural view of a refrigerant circulating system composed of an outdoor unit and an indoor unit of an air conditioner according to the present invention during refrigerant charging;
fig. 4 is a schematic flow chart illustrating a refrigerant filling control method according to an embodiment of the present invention;
fig. 5 is a schematic flow chart illustrating a refrigerant filling control method according to another embodiment of the present invention;
fig. 6 is a diagram illustrating an exemplary control process of the refrigerant charging control method according to the present invention;
fig. 7 is a diagram illustrating another example of a control process of the refrigerant filling control method according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a new air conditioner outdoor unit, which is characterized in that a refrigerant filling pipeline is added on the structure of the existing air conditioner outdoor unit, and meanwhile, the amount of refrigerant required to be filled by the air conditioner outdoor unit is accurately obtained by utilizing a controller in the air conditioner outdoor unit, so that the filling of the refrigerant is controlled. Therefore, the invention not only ensures the accurate addition amount of the refrigerant when the air conditioner is installed or maintained, ensures the reliability and the use effect of the air conditioner, but also reduces the calculation process of the refrigerant for installation and maintenance and reduces the workload for installation and maintenance.
As shown in fig. 1, a structure of an outdoor unit of an air conditioner according to the present invention is proposed. The outdoor unit of an air conditioner includes a compressor 101, an outdoor heat exchanger 102, a low-pressure tank 103, a four-way valve 104, and a throttle member 105. The air outlet of the compressor 101 is connected to a first port of a four-way valve 104, a second port of the four-way valve 104 is connected to one end of an outdoor heat exchanger 102, and the other end of the outdoor heat exchanger 102 is connected to a second stop valve 20b through a throttle member 105. A third port of the four-way valve 104 is connected to the third stop valve 20c, a fourth port of the four-way valve is connected to an inlet of the low-pressure tank 103, and an outlet of the low-pressure tank 103 is connected to a return port of the compressor 101.
The inlet of the low-pressure tank 103 is also connected to one end of a refrigerant charging line 106, and the other end of the refrigerant charging line 106 is used for connecting the refrigerant storage tank during refrigerant charging. The refrigerant storage tank is used for storing the refrigerant and filling the refrigerant into the air conditioner when necessary. The refrigerant filling line 106 is provided with a filling switch 107. The charge switch 107 is an electrically controlled switch that is turned on or off in response to a control signal. When the outdoor unit is not filled with refrigerant, the other end of the refrigerant filling line 106 is connected to the first stop valve 20 a.
The outdoor unit of the air conditioner further includes a controller 108, and the controller 108 controls the compressor to perform cooling operation when refrigerant charging is required, and controls the charging switch 107 to be turned on, and controls the charging switch 107 to be turned off when it is determined that the refrigerant in the refrigerant circulation system of the air conditioner is sufficient. The refrigerant of the refrigerant circulation system of the air conditioner may include a refrigerant in a circulation line, and a refrigerant remaining in the compressor 101, the outdoor heat exchanger 102, the indoor heat exchanger, the low pressure tank 103, and the like.
Further, the charge switch 107 includes a solenoid valve 1071 and a pressure relief valve 1072, and the solenoid valve 1071 and the pressure relief valve 1072 are disposed in parallel. The solenoid valve 1071 is connected to the controller 108 so that the solenoid valve 1071 is opened or closed by receiving a control signal from the controller 108 to automatically fill the refrigerant. The pressure relief valve 1072 is opened when the pressure reaches a predetermined value, to press the refrigerant in the refrigerant line 106 into the low-pressure tank 103. Therefore, in order to prevent the refrigerant stored in the refrigerant filling line 106 between the solenoid valve 1071 and the first shut-off valve 20a from having a high volume expansion pressure under high temperature conditions and thus breaking the pipe during operation of the air conditioner, the pressure relief valve 1072 is provided. It is to be understood that the pressure relief valve 1072 may be replaced with another member having the same function, such as a capillary tube, which is not exemplified here.
In another embodiment, as shown in fig. 2, the charge switch 107 may be an electronic expansion valve 1073. The electronic expansion valve 1073 receives the control signal from the controller 108 to open or close, or even adjust the opening degree, so as to realize the automatic filling of the refrigerant. Meanwhile, the electronic expansion valve 1073 is in an open state and at the maximum opening degree during the operation of the air conditioner, or the opening degree is adjusted according to the control of the controller 108, so as to prevent the refrigerant accumulated in the pipe between the electronic expansion valve 1073 and the first stop valve 20a in the refrigerant filling pipe 106 from having a volume expansion pressure too high under high temperature conditions and causing the pipe rupture during the operation of the air conditioner.
Further, a filter screen 109 is further disposed on the refrigerant filling pipeline, and the filter screen 109 is disposed at the other end of the refrigerant filling pipeline 106. The filter screen 109 is used for filtering impurities in the filled refrigerant, so as to ensure that the refrigerant of the refrigerant circulating system of the air conditioner has higher purity.
The process of refrigerant charging when the outdoor unit of the air conditioner is installed and maintained will be described in detail below.
As shown in fig. 3, when the outdoor unit is mounted, the second stop valve 20b and the third stop valve 20c of the outdoor unit are removed, the outdoor heat exchanger 102 is connected to one end of the indoor heat exchanger via the throttle member 105, and the other end of the indoor heat exchanger is connected to the third port of the four-way valve 104. When the refrigerant is required to be filled, the first stop valve 20a is firstly taken down, and the outlet of the refrigerant storage tank is communicated with the refrigerant filling pipeline. The controller 108 controls the compressor to perform cooling operation firstly, then controls the filling switch 107 to be opened so as to fill the refrigerant into the air conditioner, and when the refrigerant in the refrigerant circulating system of the air conditioner is sufficient, the control filling switch 107 is closed, so that the automatic filling of the refrigerant is realized, and the accurate refrigerant demand is ensured.
Similarly, when the air conditioner is maintained, if the refrigerant is required to be filled, the first stop valve 20a is first removed, and the outlet of the refrigerant storage tank is communicated with the refrigerant filling pipeline 106. The controller 108 controls the compressor 101 to run in a refrigerating mode, then controls the filling switch 107 to be opened so as to fill the air conditioner with the refrigerant, and when the refrigerant in the refrigerant circulating system of the air conditioner is determined to be sufficient, the control filling switch 107 is closed, automatic filling of the refrigerant is achieved, and accurate refrigerant demand is guaranteed.
Because the controller 108 performs refrigerant filling in the air conditioner operation refrigeration mode, the controller controls the filling switch 107 to be opened, and in the process of filling the refrigerant, the controller can control the filling switch 107 to be opened for a period of time and then closed, and can determine whether the refrigerant is sufficient after the refrigerant is continued for a period of time, so as to determine whether to continue to fill the refrigerant or stop filling the refrigerant. Because the refrigerant is filled into the refrigerant circulating system, whether the refrigerant is sufficient can be accurately judged after the refrigerant is operated for a period of time. In the embodiment of the invention, after the charging switch 107 is controlled to be opened for 1 minute, the charging switch is closed for 1 minute, and whether the refrigerant is sufficient is judged. If the charge switch 107 is an electronic expansion valve 1073, the electronic expansion valve 1073 is controlled to be opened and the opening degree is 400P, and after the opening degree is maintained for 1 minute, the electronic expansion valve is closed for 1 minute, and whether the refrigerant is sufficient or not is judged. In the case where the charge switch 107 is the electronic expansion valve 1073, the opening degree of the electronic expansion valve 1073 is not limited to 400P, and may be changed from large to small depending on the number of charge cycles.
Therefore, the refrigerant filling pipeline is arranged at the inlet of the low-pressure tank of the air conditioner outdoor unit, so that the refrigerant filling is easier, and the filled refrigerant can quickly flow back to the compressor; meanwhile, the controller is utilized to determine the actual demand of the refrigerant, and the filling switch on the refrigerant filling pipeline is controlled according to the actual demand, so that the refrigerant is accurately filled, the refrigerant adding amount of the air conditioner is accurate after the air conditioner is installed or maintained, the reliability and the using effect of the air conditioner are ensured, the refrigerant calculation process of installation and maintenance is reduced, and the workload of installation and maintenance is reduced.
In one embodiment, the controller 108 determines whether the refrigerant in the refrigerant cycle system of the air conditioner is sufficient: and determining whether the refrigerant in the outdoor unit of the air conditioner is sufficient or not according to the comparison result of the refrigerant pressure of the air outlet of the compressor and the preset highest pressure corresponding to the outdoor environment temperature.
And a pressure sensor is arranged at the air outlet of the compressor to detect the pressure value of the refrigerant at the air outlet of the compressor. Meanwhile, in the embodiment, a mapping relation between the outdoor environment temperature and the highest pressure and the lowest starting pressure is preset. Since the highest pressure and the lowest starting pressure after the air conditioner is started are both related to the outdoor environment temperature, in this embodiment, the empirical values of the highest pressure and the lowest starting pressure corresponding to different outdoor environment temperatures are obtained through multiple tests, so that the mapping relationship between the outdoor environment temperature and the highest pressure and the lowest starting pressure is formed.
After the pressure value of the refrigerant at the air outlet of the compressor is detected, the outdoor environment temperature is obtained, then the preset highest pressure value corresponding to the outdoor environment temperature in the mapping relation is inquired, the preset highest pressure value is compared with the detected pressure value of the refrigerant, and whether the refrigerant of the outdoor unit of the air conditioner is sufficient or not is determined according to the comparison result. Specifically, assuming that the detected refrigerant pressure value is Pc, the preset maximum pressure value corresponding to the outdoor ambient temperature is Ps 2. When Pc is larger than or equal to Ps2, the filled refrigerant is determined to be sufficient; when Pc < Ps2, it is determined that the refrigerant is not enough to be filled, and the filling needs to be continued.
In another embodiment, since there is a possibility that the judgment will be made by mistake according to the pressure value, in order to accurately determine whether the refrigerant is sufficient, the method further includes: and when the pressure of the refrigerant at the air outlet of the compressor is lower than the preset highest pressure corresponding to the outdoor environment temperature, judging whether the refrigerant in the outdoor unit of the air conditioner is sufficient or not according to the supercooling degree of the outlet of the outdoor heat exchanger.
Specifically, when Pc < Ps2, the outlet supercooling degree of the outdoor heat exchanger is obtained, so as to continuously judge whether the refrigerant in the refrigerant circulation system of the air conditioner is sufficient according to the outlet supercooling degree. The outlet supercooling degree is characterized in that a temperature sensor is arranged on the outdoor heat exchanger to detect the temperature of condensed water when the outdoor heat exchanger operates in a refrigeration mode, whether the temperature is lower than the saturation temperature under the equal pressure or not is judged, and if yes, the difference value between the temperature and the saturation temperature under the equal pressure is calculated, namely the supercooling degree. And comparing the supercooling degree obtained by calculation with a preset threshold value, and determining whether the refrigerant is sufficient according to a comparison result. Assuming that the preset threshold value is 3 ℃, the degree of supercooling obtained by calculation is Tg. When Tg is more than or equal to 3 ℃, determining that the filled refrigerant is sufficient; when Tg is less than 3 ℃, the refrigerant is determined to be insufficient to be filled, and the filling is required to be continued.
According to the embodiment of the invention, whether the refrigerant of the refrigerant circulating system of the air conditioner is sufficient is judged by combining the refrigerant pressure of the air outlet of the compressor and the outlet supercooling degree of the outdoor heat exchanger, so that the demand of the refrigerant can be more accurate.
Furthermore, after the refrigerant storage tank is communicated with the refrigerant filling pipeline, the air conditioner can be triggered to enter a refrigerant filling mode through a function key of the remote controller. Or when the refrigerant filling pipeline is detected to be communicated with the refrigerant storage tank, a corresponding signal is sent to the controller 108. The controller 108 receives the signal and controls the air conditioner to enter the refrigerant charging mode. That is, the compressor 101 is controlled to perform a cooling operation, and the charging switch 107 is controlled to be turned on, so as to realize automatic charging of the refrigerant. When the refrigerant balance pressure is smaller than the preset minimum starting pressure corresponding to the outdoor environment temperature, the charging switch 107 is controlled to be opened until the refrigerant balance pressure in the air conditioner outdoor unit is larger than or equal to the preset minimum starting pressure corresponding to the outdoor environment temperature; when the refrigerant balance pressure is greater than or equal to the preset minimum starting pressure corresponding to the outdoor environment temperature, the compressor 101 is controlled to be started and to perform refrigeration operation.
Correspondingly, the invention provides a refrigerant filling control method, which is applied to a refrigerant circulating system comprising the air conditioner outdoor unit, and a filling pipeline of the air conditioner outdoor unit is communicated with a refrigerant storage tank. As shown in fig. 4, the refrigerant charge control method includes the following steps:
step S110, controlling a compressor to run for a first preset time in a refrigerating mode;
in this embodiment, the controller 108 controls the compressor 101 to start and perform the cooling operation after receiving the command to enter the refrigerant charging mode. Since the refrigerant circulation system is stable after the compressor 101 performs the refrigeration operation for a period of time, the refrigeration operation of the compressor 101 is controlled for a first preset time, so that whether the refrigerant in the refrigerant circulation system is sufficient is determined after the refrigerant circulation system performs the refrigeration operation stably. In this embodiment, the first predetermined time is 15 minutes.
Step S120, judging whether the refrigerant of the refrigerant circulating system is sufficient; if yes, the step S130 is carried out, otherwise, the step S130 is carried out;
whether the refrigerant in the refrigerant circulation system is sufficient or not can be judged according to the refrigerant pressure at the air outlet of the compressor 101 and the outlet supercooling degree of the outdoor heat exchanger.
Step S130, starting a filling switch, closing the filling switch after maintaining the second preset time, and turning to step S120;
when the refrigerant in the refrigerant circulation system is judged to be insufficient, the filling switch 107 is turned on, and the filling switch 107 is turned off after the second preset time is maintained. The second preset time may be 1 minute. Because the refrigerant is filled into the refrigerant circulating system, whether the refrigerant is sufficient can be accurately judged after the refrigerant is operated for a period of time. Therefore, after the charging switch 107 is turned off, the third predetermined time is maintained, and the process proceeds to step S120. In this embodiment, the third preset time may be 1 minute.
And step S140, stopping filling the refrigerant.
When the refrigerant of the refrigerant circulating system is sufficient, the sufficient refrigerant is stopped, the connection between the refrigerant filling pipeline 106 and the refrigerant storage tank is disconnected, and the hollow end of the refrigerant filling pipeline 106 is connected with the first stop valve 20 a.
Therefore, the refrigerant filling pipeline is arranged at the inlet of the low-pressure tank of the air conditioner outdoor unit, so that the refrigerant filling is easier, and the filled refrigerant can quickly flow back to the compressor; meanwhile, the controller is utilized to determine the actual demand of the refrigerant, and the filling switch on the refrigerant filling pipeline is controlled according to the actual demand, so that the refrigerant is accurately filled, the refrigerant adding amount of the air conditioner is accurate after the air conditioner is installed or maintained, the reliability and the using effect of the air conditioner are ensured, the refrigerant calculation process of installation and maintenance is reduced, and the workload of installation and maintenance is reduced.
Further, the step S120 includes:
and determining whether the refrigerant in the outdoor unit of the air conditioner is sufficient or not according to the comparison result of the refrigerant pressure of the air outlet of the compressor and the preset highest pressure corresponding to the outdoor environment temperature.
And a pressure sensor is arranged at the air outlet of the compressor to detect the pressure value of the refrigerant at the air outlet of the compressor. Meanwhile, in the embodiment, a mapping relation between the outdoor environment temperature and the highest pressure and the lowest starting pressure is preset. Since the highest pressure and the lowest starting pressure after the air conditioner is started are both related to the outdoor environment temperature, in this embodiment, the empirical values of the highest pressure and the lowest starting pressure corresponding to different outdoor environment temperatures are obtained through multiple tests, so that the mapping relationship between the outdoor environment temperature and the highest pressure and the lowest starting pressure is formed.
After the pressure value of the refrigerant at the air outlet of the compressor is detected, the outdoor environment temperature is obtained, then the preset highest pressure value corresponding to the outdoor environment temperature in the mapping relation is inquired, the preset highest pressure value is compared with the detected pressure value of the refrigerant, and whether the refrigerant of the outdoor unit of the air conditioner is sufficient or not is determined according to the comparison result. Specifically, assuming that the detected refrigerant pressure value is Pc, the preset maximum pressure value corresponding to the outdoor ambient temperature is Ps 2. When Pc is larger than or equal to Ps2, the filled refrigerant is determined to be sufficient; when Pc < Ps2, it is determined that the refrigerant is not enough to be filled, and the filling needs to be continued.
In another embodiment, since it is determined that there is a possibility of an erroneous determination according to the pressure value, in order to accurately determine whether the refrigerant is sufficient, the step S120 may further include:
and when the pressure of the refrigerant at the air outlet of the compressor is lower than the preset highest pressure corresponding to the outdoor environment temperature, judging whether the refrigerant in the outdoor unit of the air conditioner is sufficient or not according to the supercooling degree of the outlet of the outdoor heat exchanger.
Specifically, when Pc < Ps2, the outlet supercooling degree of the outdoor heat exchanger is obtained, so as to continuously judge whether the refrigerant in the refrigerant circulation system of the air conditioner is sufficient according to the outlet supercooling degree. The outlet supercooling degree is characterized in that a temperature sensor is arranged on the outdoor heat exchanger to detect the temperature of condensed water when the outdoor heat exchanger operates in a refrigeration mode, whether the temperature is lower than the saturation temperature under the equal pressure or not is judged, and if yes, the difference value between the temperature and the saturation temperature under the equal pressure is calculated, namely the supercooling degree. And comparing the supercooling degree obtained by calculation with a preset threshold value, and determining whether the refrigerant is sufficient according to a comparison result. Assuming that the preset threshold value is 3 ℃, the degree of supercooling obtained by calculation is Tg. When Tg is more than or equal to 3 ℃, determining that the filled refrigerant is sufficient; when Tg is less than 3 ℃, the refrigerant is determined to be insufficient to be filled, and the filling is required to be continued.
According to the embodiment of the invention, whether the refrigerant of the refrigerant circulating system of the air conditioner is sufficient is judged by combining the refrigerant pressure of the air outlet of the compressor and the outlet supercooling degree of the outdoor heat exchanger, so that the demand of the refrigerant can be more accurate.
Further, as shown in fig. 5, before the step S110, the method further includes:
and S100, after the refrigerant filling pipeline is connected with the refrigerant storage tank, if the refrigerant balance pressure in the air conditioner outdoor unit is less than the preset minimum starting pressure corresponding to the outdoor environment temperature, controlling the filling switch to be opened until the refrigerant balance pressure in the air conditioner outdoor unit is greater than or equal to the preset minimum starting pressure corresponding to the outdoor environment temperature.
After the refrigerant storage tank is communicated with the refrigerant filling pipeline, the air conditioner can be triggered to enter a refrigerant filling mode through a function key of the remote controller. Or when the refrigerant filling pipeline is detected to be communicated with the refrigerant storage tank, a corresponding signal is sent to the controller 108. The controller 108 receives the signal and controls the air conditioner to enter the refrigerant charging mode. That is, the compressor 101 is controlled to perform a cooling operation, and the charging switch 107 is controlled to be turned on, so as to realize automatic charging of the refrigerant. When the refrigerant balance pressure is smaller than the preset minimum starting pressure corresponding to the outdoor environment temperature, the charging switch 107 is controlled to be opened until the refrigerant balance pressure in the air conditioner outdoor unit is larger than or equal to the preset minimum starting pressure corresponding to the outdoor environment temperature; when the refrigerant balance pressure is greater than or equal to the preset minimum starting pressure corresponding to the outdoor environment temperature, the compressor 101 is controlled to be started and to perform refrigeration operation.
The above-described refrigerant filling control method will be further explained with two refrigerant filling examples.
Example 1
As shown in fig. 6, the refrigerant charge control method may include the following steps:
step S101, detecting the refrigerant balance pressure P1 of a refrigerant circulating system;
step S102, acquiring a preset lowest starting pressure Ps1 corresponding to the outdoor environment temperature;
step S103, judging whether the pressure P1 is greater than or equal to the pressure Ps 1; if yes, the step S105 is executed, otherwise, the step S104 is executed;
step S104, controlling the electromagnetic valve 1071 to be opened;
step S105, controlling the electromagnetic valve 1071 to be closed, and controlling the compressor 101 to start refrigeration operation for 15 minutes;
step S106, judging whether the running high pressure Pc of the refrigerant circulating system is greater than or equal to the preset highest pressure Ps2 corresponding to the outdoor environment temperature; if yes, the step S109 is executed, otherwise, the step S107 is executed;
step S107, judging whether the supercooling degree of the outlet of the outdoor heat exchanger 102 is greater than or equal to 3 ℃, if so, turning to step S109, otherwise, turning to step S108;
step S108, after the electromagnetic valve 1071 is controlled to be opened for 1 minute, the electromagnetic valve is closed for 1 minute, and then the step S106 is carried out;
and step S109, stopping filling the refrigerant.
It is understood that the above control parameters are only examples of the example, and do not limit the above parameter values, and can be flexibly adjusted according to specific situations.
Example two
As shown in fig. 7, the refrigerant charge control method may include the following steps:
step S201, detecting the refrigerant balance pressure P1 of a refrigerant circulating system;
step S202, acquiring preset lowest starting pressure Ps1 corresponding to the outdoor environment temperature;
step S203, judging whether P1 is greater than or equal to Ps 1; if yes, go to step S205, otherwise go to step S204;
step S204, controlling the electronic expansion valve 1073 to be opened, wherein the opening degree is 400P;
step S205, controlling the electronic expansion valve 1073 to be closed, and controlling the compressor 101 to start refrigeration operation for 15 minutes;
step S206, judging whether the running high pressure Pc of the refrigerant circulating system is greater than or equal to the preset highest pressure Ps2 corresponding to the outdoor environment temperature; if yes, go to step S209, otherwise go to step S207;
step S207, judging whether the supercooling degree of the outlet of the outdoor heat exchanger 102 is greater than or equal to 3 ℃, if so, turning to step S209, otherwise, turning to step S208;
step S208, controlling the electronic expansion valve 1073 to be opened for 1 minute, controlling the opening degree to be 400P, then closing for 1 minute, and then turning to step S206;
step S209 stops refrigerant charging.
It is understood that the above control parameters are only examples of the example, and do not limit the above parameter values, and can be flexibly adjusted according to specific situations. The opening degree of the electronic expansion valve 1073 when opened is not limited to a fixed value, and may be controlled to change from large to small according to the number of filling cycles.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (11)
1. An outdoor unit of an air conditioner comprises a compressor, an outdoor heat exchanger, a low-pressure tank and a controller, and is characterized by further comprising a refrigerant filling pipeline, wherein one end of the refrigerant filling pipeline is connected with an inlet of the low-pressure tank, and the other end of the refrigerant filling pipeline is used for being connected with a refrigerant storage tank; a filling switch is arranged on the refrigerant filling pipeline; the controller controls the filling switch to be opened under the refrigeration operation of the compressor, and controls the filling switch to be closed when the refrigerant of the air conditioner refrigerant circulating system is sufficient.
2. The outdoor unit of claim 1, wherein the controller determines whether the refrigerant in the refrigerant circulation system of the air conditioner is sufficient based on a comparison result between a pressure of the refrigerant at the outlet of the compressor and a preset maximum pressure corresponding to an outdoor ambient temperature.
3. The outdoor unit of claim 2, wherein the controller determines whether the refrigerant of the air-conditioning refrigerant circulation system is sufficient according to the degree of supercooling of the outlet of the outdoor heat exchanger when the pressure of the refrigerant at the outlet of the compressor is less than a preset maximum pressure corresponding to the outdoor ambient temperature.
4. The outdoor unit of any one of claims 1 to 3, wherein the controller controls the charge switch to be turned on when a refrigerant equilibrium pressure of the air-conditioning refrigerant circulation system is lower than a preset minimum startup pressure corresponding to the outdoor ambient temperature after the refrigerant charge line is connected to the refrigerant storage tank, until the refrigerant equilibrium pressure of the air-conditioning refrigerant circulation system is higher than or equal to the preset minimum startup pressure corresponding to the outdoor ambient temperature, and controls the compressor to be turned on and perform a cooling operation.
5. The outdoor unit of claim 1, wherein the charge switch comprises a solenoid valve and a pressure relief valve, and the solenoid valve and the pressure relief valve are disposed in parallel.
6. The outdoor unit of claim 1, wherein the charge switch comprises an electronic expansion valve.
7. The outdoor unit of claim 1, wherein a filter screen is further provided on the refrigerant filling line, and the filter screen is disposed at the other end of the refrigerant filling line.
8. The outdoor unit of claim 1, wherein the other end of the refrigerant filling line is further used to connect a stop valve when the refrigerant storage tank is not connected.
9. The refrigerant filling control method of the air conditioner is characterized by being applied to the air conditioner comprising the air conditioner outdoor unit of claim 1, wherein a refrigerant filling pipeline in the air conditioner outdoor unit is communicated with a refrigerant storage tank; the refrigerant filling control method comprises the following steps:
s1, controlling the compressor to operate for a first preset time;
s2, judging whether the refrigerant of the air conditioner outdoor unit is sufficient;
s3, stopping filling the refrigerant when the refrigerant of the air-conditioning refrigerant circulating system is sufficient;
s4, when the refrigerant of the air-conditioning refrigerant circulation system is insufficient, the charge switch is controlled to be opened for a first preset time, and the process goes to step S2.
10. The refrigerant charge control method of an air conditioner as claimed in claim 9, wherein the step S2 includes:
determining whether the refrigerant of the air conditioner refrigerant circulating system is sufficient or not according to the comparison result of the refrigerant pressure of the air outlet of the compressor and the preset highest pressure corresponding to the outdoor environment temperature; or,
and when the pressure of the refrigerant at the air outlet of the compressor is lower than the preset highest pressure corresponding to the outdoor environment temperature, judging whether the refrigerant of the air-conditioning refrigerant circulating system is sufficient according to the degree of supercooling of the outlet of the outdoor heat exchanger.
11. The refrigerant charge control method of an air conditioner as claimed in claim 9, wherein the step S1 is preceded by the steps of:
after the refrigerant filling pipeline is connected with the refrigerant storage tank, if the refrigerant balance pressure of the air-conditioning refrigerant circulating system is smaller than the preset minimum starting pressure corresponding to the outdoor environment temperature, the filling switch is controlled to be opened until the refrigerant balance pressure of the air-conditioning refrigerant circulating system is larger than or equal to the preset minimum starting pressure corresponding to the outdoor environment temperature.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004360952A (en) * | 2003-06-03 | 2004-12-24 | Sanyo Electric Co Ltd | Heat pump device |
| CN203298539U (en) * | 2013-04-25 | 2013-11-20 | 广东美的电器股份有限公司 | Air conditioner auxiliary device and air-conditioning system |
| CN104534752A (en) * | 2015-01-26 | 2015-04-22 | 珠海格力电器股份有限公司 | Refrigerant filling system and method and air conditioning unit |
| CN104676944A (en) * | 2013-11-28 | 2015-06-03 | 合肥美的暖通设备有限公司 | Air conditioning system and cold media adjusting method thereof |
-
2015
- 2015-07-09 CN CN201510402416.0A patent/CN105004116B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004360952A (en) * | 2003-06-03 | 2004-12-24 | Sanyo Electric Co Ltd | Heat pump device |
| CN203298539U (en) * | 2013-04-25 | 2013-11-20 | 广东美的电器股份有限公司 | Air conditioner auxiliary device and air-conditioning system |
| CN104676944A (en) * | 2013-11-28 | 2015-06-03 | 合肥美的暖通设备有限公司 | Air conditioning system and cold media adjusting method thereof |
| CN104534752A (en) * | 2015-01-26 | 2015-04-22 | 珠海格力电器股份有限公司 | Refrigerant filling system and method and air conditioning unit |
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