CN107906807B - Refrigerant charging control method and system and air conditioner - Google Patents
Refrigerant charging control method and system and air conditioner Download PDFInfo
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- CN107906807B CN107906807B CN201711054149.8A CN201711054149A CN107906807B CN 107906807 B CN107906807 B CN 107906807B CN 201711054149 A CN201711054149 A CN 201711054149A CN 107906807 B CN107906807 B CN 107906807B
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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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- 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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Abstract
The invention provides a control method and a control system for refrigerant charging and an air conditioner, wherein the control method for refrigerant charging comprises the following steps: acquiring a system pressure parameter; when the system pressure parameter is lower than the preset pressure parameter, controlling a refrigerant filling valve to perform first-stage filling; acquiring the temperature change rate of the tube temperature of the heat exchanger; and controlling a refrigerant filling valve to enter a second stage for filling according to the temperature change rate of the heat exchanger tube temperature. According to the control method for refrigerant charging, manual judgment and operation are not needed, when the amount of refrigerant in the refrigerant tank is low, the refrigerant charging valve can be controlled to perform first-stage charging, namely rapid charging, according to system pressure parameters without starting an air conditioning system, rapidity of refrigerant charging is guaranteed, meanwhile, second-stage charging, namely accurate charging, is controlled to be started according to the temperature change rate of the heat exchanger tube temperature, accuracy of refrigerant charging is guaranteed, and the problems of time waste, low accuracy and damage to the service life of the system caused by manual judgment and operation are solved.
Description
Technical Field
The invention relates to the technical field of refrigerant charging, in particular to a control method and a control system for refrigerant charging and an air conditioner.
Background
In the related art, the intelligent and convenient installation technology of the heat pump air conditioning system is increasingly urgent. The simple and fast installation technology can save the installation time on one hand, and can avoid human errors on the other hand. For an air conditioning system requiring the addition of refrigerant to the piping, taking a multi-split air conditioning unit as an example, the rapid and intelligent addition of refrigerant to the piping is a technical point to be solved urgently. The existing processing mode is usually manual weighing and adding, the problems of long time consumption, easy error and the like become a big problem in engineering installation, and meanwhile, under the condition of partial installation, an operator directly starts the machine to fill refrigerant under the condition of insufficient refrigerant of a system, so that the system is damaged, and the service life of the system is influenced.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, a first aspect of the invention proposes a method for controlling the filling of a refrigerant.
A second aspect of the present invention is to provide a control system for refrigerant charging.
A third aspect of the present invention is to provide an air conditioner.
In view of the above, according to a first aspect of the present invention, there is provided a method for controlling refrigerant charging, which is used for an air conditioner, the air conditioner includes an outdoor unit of the air conditioner, a refrigerant tank, a refrigerant charging valve and a heat exchanger tube temperature sensor, the refrigerant charging valve is connected to the refrigerant tank to control refrigerant charging into the refrigerant tank, and the method for controlling refrigerant charging includes: acquiring a system pressure parameter; when the system pressure parameter is lower than the preset pressure parameter, controlling a refrigerant filling valve to perform first-stage filling; acquiring the temperature change rate of the tube temperature of the heat exchanger; and controlling a refrigerant filling valve to enter a second stage for filling according to the temperature change rate of the heat exchanger tube temperature.
The control method for refrigerant charging provided by the invention comprises the steps of obtaining a system pressure parameter, when the system pressure parameter is lower than a preset pressure parameter, indicating that the amount of refrigerant in a refrigerant tank is less and the refrigerant needs to be charged, and controlling a refrigerant charging valve to be opened for first-stage charging; the temperature change rate of obtaining heat exchanger tube temperature in real time, fill the filling valve and get into the second stage according to the temperature change rate control refrigerant and fill, wherein, the first stage is filled and is filled for filling fast, makes the refrigerant volume in the refrigerant jar can promote fast, judges system pressure parameter simultaneously, has ensured that the system can not fill the refrigerant for the operation of opening the machine under low pressure state, and the second stage is filled and is filled for the accurate filling, the filling of the refrigerant volume in the accurate control refrigerant jar. According to the invention, the refrigerant automatic filling process of the air-conditioning system is divided into a first filling stage and a second filling stage, manual judgment and operation are not needed, when the amount of the refrigerant in the refrigerant tank is low, the refrigerant filling valve can be controlled according to the pressure parameter of the system to perform first-stage filling, namely rapid filling, without starting the air-conditioning system, so that the rapidity of refrigerant filling is ensured, meanwhile, the second-stage filling, namely accurate filling, is controlled to be started according to the temperature change rate of the heat exchanger tube temperature, the accuracy of refrigerant filling is ensured, and the problems of time waste, low accuracy and easy damage to the service life of the system caused by manual judgment and operation are solved.
The method for controlling the refrigerant charging according to the present invention may further include the following technical features:
in the above technical solution, preferably, the temperature change rate of the heat exchanger tube temperature is obtained; according to the temperature change rate of the temperature of the heat exchanger tube, the step of controlling the refrigerant filling valve to enter the second stage for filling is specifically as follows: acquiring the tube temperature of the heat exchanger at a preset frequency; calculating the temperature change rate of the tube temperature of the heat exchanger; judging whether the temperature change rate is smaller than a preset temperature change rate or not; when the temperature change rate is smaller than the preset temperature change rate, controlling a refrigerant filling valve to enter a second stage for filling; and when the temperature change rate is greater than or equal to the preset temperature change rate, returning to continuously obtain the temperature of the heat exchanger tube at the preset frequency.
In the technical scheme, the temperature of a heat exchanger tube is obtained at a preset frequency, the temperature change rate is calculated, whether the temperature change rate is smaller than the preset temperature change rate or not is further judged, when the temperature change rate is smaller than the preset temperature change rate, the filling process of a first stage is close to saturation, and a refrigerant filling valve is controlled to enter a second filling stage for accurate filling; when the temperature change rate is more than or equal to the preset temperature change rate, the filling process in the first stage is not close to saturation, the temperature of the heat exchanger tube needs to be continuously and quickly filled, the temperature of the heat exchanger tube is continuously obtained at the preset frequency, so that the system enters the second filling stage when the refrigerant amount in the refrigerant tank reaches a certain amount, and the filling rapidity of the first filling stage is ensured.
In any of the above technical solutions, preferably, after the step of controlling the refrigerant charging valve to enter the second stage charging according to the temperature change rate of the heat exchanger tube temperature, the method further includes: acquiring exhaust temperature and exhaust pressure; and when the difference between the exhaust temperature and the saturation temperature corresponding to the exhaust pressure is in a preset interval, controlling the refrigerant filling valve to close to finish the second-stage filling.
In the technical scheme, after the system enters the second stage, when the difference between the exhaust temperature and the saturation temperature corresponding to the exhaust pressure is in a preset interval, the fact that the refrigerant does not need to be refilled in the refrigerant tank is described, the refrigerant filling valve is controlled to be closed, the filling in the second stage is stopped, the accuracy of the filling in the second stage is guaranteed, and the excessive filling is prevented.
In any one of the above technical solutions, preferably, before the step of controlling the refrigerant charging valve to perform the first-stage charging, the method further includes: the air conditioner is pumped to a vacuum state.
In the technical scheme, the air conditioner is pumped to a vacuum state, the exhaust pressure and the exhaust temperature of the air conditioner are prevented from being too high, and the performance of the air conditioner is not influenced.
In any of the above technical solutions, preferably, the temperature change rate of the heat exchanger tube temperature is a ratio of a difference between the current heat exchanger tube temperature and the previously detected heat exchanger tube temperature to a preset frequency.
In the technical scheme, the temperature change rate of the heat exchanger tube temperature is calculated, and the refrigerant filling valve is further controlled to be closed to enter the second filling stage according to the temperature change rate, so that the automatic filling process is ensured.
In a second aspect of the present invention, a refrigerant charging control system is provided for an air conditioner, the air conditioner includes an air conditioner outdoor unit, a refrigerant tank, a refrigerant charging valve, and a heat exchanger tube temperature sensor, the refrigerant charging control system includes: the first acquisition unit is used for acquiring a system pressure parameter; the first control unit is used for controlling the refrigerant filling valve to perform first-stage filling when the system pressure parameter is lower than a preset pressure parameter; the second acquiring unit is used for acquiring the temperature change rate of the heat exchanger tube temperature; and the second control unit is used for controlling the refrigerant filling valve to enter the second stage for filling according to the temperature change rate of the heat exchanger tube temperature.
The control system for refrigerant charging provided by the invention obtains the system pressure parameter, when the system pressure parameter is lower than the preset pressure parameter, the quantity of the refrigerant in the refrigerant tank is less, the refrigerant needs to be charged, and at this time, the refrigerant charging valve is controlled to be opened for first-stage charging; the temperature change rate of obtaining heat exchanger tube temperature in real time, fill the filling valve and get into the second stage according to the temperature change rate control refrigerant and fill, wherein, the first stage is filled and is filled for filling fast, makes the refrigerant volume in the refrigerant jar can promote fast, judges system pressure parameter simultaneously, has ensured that the system can not fill the refrigerant for the operation of opening the machine under low pressure state, and the second stage is filled and is filled for the accurate filling, the filling of the refrigerant volume in the accurate control refrigerant jar. According to the invention, the refrigerant automatic filling process of the air-conditioning system is divided into a first filling stage and a second filling stage, manual judgment and operation are not needed, when the amount of the refrigerant in the refrigerant tank is low, the refrigerant filling valve can be controlled according to the pressure parameter of the system to perform first-stage filling, namely rapid filling, without starting the air-conditioning system, so that the rapidity of refrigerant filling is ensured, meanwhile, the second-stage filling, namely accurate filling, is controlled to be started according to the temperature change rate of the heat exchanger tube temperature, the accuracy of refrigerant filling is ensured, and the problems of time waste, low accuracy and easy damage to the service life of the system caused by manual judgment and operation are solved.
The control system for refrigerant charging according to the present invention may further include the following technical features:
in the foregoing technical solution, preferably, the second obtaining unit specifically includes: the third acquiring unit is used for acquiring the temperature of the heat exchanger tube at a preset frequency; the calculating unit is used for calculating the temperature change rate of the heat exchanger tube temperature; the second control unit specifically includes: the judging unit is used for judging whether the temperature change rate is smaller than a preset temperature change rate or not; the third control unit is used for controlling the refrigerant charging valve to perform second-stage charging when the temperature change rate is smaller than the preset temperature change rate; and when the temperature change rate is larger than or equal to the preset temperature change rate, returning to continuously obtain the temperature of the heat exchanger tube at the preset frequency.
In the technical scheme, the temperature of a heat exchanger tube is obtained at a preset frequency, the temperature change rate is calculated, whether the temperature change rate is smaller than the preset temperature change rate or not is further judged, when the temperature change rate is smaller than the preset temperature change rate, the filling process of a first stage is close to saturation, and a refrigerant filling valve is controlled to enter a second filling stage for accurate filling; when the temperature change rate is more than or equal to the preset temperature change rate, the filling process in the first stage is not close to saturation, the temperature of the heat exchanger tube needs to be continuously and quickly filled, the temperature of the heat exchanger tube is continuously obtained at the preset frequency, so that the system enters the second filling stage when the refrigerant amount in the refrigerant tank reaches a certain amount, and the filling rapidity of the first filling stage is ensured.
In any one of the above technical solutions, preferably, the second control unit further includes: the fourth acquiring unit is used for acquiring the exhaust temperature and the exhaust pressure when the temperature change rate is smaller than the preset temperature change rate; and the fourth control unit is used for controlling the refrigerant filling valve to be closed when the difference between the exhaust temperature and the saturation temperature corresponding to the exhaust pressure is in a preset interval.
In the technical scheme, after the system enters the second stage, when the difference between the exhaust temperature and the saturation temperature corresponding to the exhaust pressure is in a preset interval, the fact that the refrigerant does not need to be refilled in the refrigerant tank is described, the refrigerant filling valve is controlled to be closed, the filling in the second stage is stopped, the accuracy of the filling in the second stage is guaranteed, and the excessive filling is prevented.
In any of the above technical solutions, preferably, before the step of controlling the refrigerant charging valve to perform the first-stage charging, the air conditioner is pumped to a vacuum state.
In the technical scheme, the air conditioner is pumped to a vacuum state, the exhaust pressure and the exhaust temperature of the air conditioner are prevented from being too high, and the performance of the air conditioner is not influenced.
In any of the above technical solutions, preferably, the temperature change rate of the heat exchanger tube temperature is a ratio of a difference between the current heat exchanger tube temperature and the previously detected heat exchanger tube temperature to a preset frequency.
In the technical scheme, the temperature change rate of the heat exchanger tube temperature is calculated, and the refrigerant filling valve is further controlled to be closed to enter the second filling stage according to the temperature change rate, so that the automatic filling process is ensured.
In a third aspect of the present invention, an air conditioner is provided, including the refrigerant charging control system in any of the above technical solutions.
The air conditioner according to the present invention includes the above-mentioned refrigerant charging control system, and thus has all the advantages of the refrigerant charging control system, which are not described herein again.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 shows a flow chart of a method for controlling refrigerant charge according to an embodiment of the invention;
fig. 2 is a flow chart illustrating a method for controlling refrigerant charging according to another embodiment of the present invention;
fig. 3 is a flow chart illustrating a method for controlling refrigerant charging according to another embodiment of the present invention;
FIG. 4a shows a schematic block diagram of a control system for refrigerant charge of an embodiment of the present invention;
FIG. 4b shows a schematic block diagram of a control system for refrigerant charging according to another embodiment of the present invention;
fig. 4c shows a schematic block diagram of a control system for refrigerant charging according to yet another embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
In an embodiment of the first aspect of the present invention, a method for controlling refrigerant charging is provided, where the method is used for an air conditioner, the air conditioner includes an air conditioner outdoor unit, a refrigerant tank, a refrigerant charging valve and a heat exchanger tube temperature sensor, and the refrigerant charging valve is connected to the refrigerant tank to control refrigerant charging into the refrigerant tank, and fig. 1 shows a flowchart of a method for controlling refrigerant charging according to an embodiment of the present invention. The control method for refrigerant charging comprises the following steps:
102, acquiring a system pressure parameter;
104, controlling a refrigerant filling valve to perform first-stage filling when the system pressure parameter is lower than a preset pressure parameter;
and step 108, controlling a refrigerant filling valve to enter a second stage for filling according to the temperature change rate of the heat exchanger tube temperature.
The control method for refrigerant charging provided by the invention comprises the steps of obtaining a system pressure parameter, when the system pressure parameter is lower than a preset pressure parameter, indicating that the amount of refrigerant in a refrigerant tank is less and the refrigerant needs to be charged, and controlling a refrigerant charging valve to be opened for first-stage charging; the temperature change rate of obtaining heat exchanger tube temperature in real time, fill the filling valve and get into the second stage according to the temperature change rate control refrigerant and fill, wherein, the first stage is filled and is filled for filling fast, makes the refrigerant volume in the refrigerant jar can promote fast, judges system pressure parameter simultaneously, has ensured that the system can not fill the refrigerant for the operation of opening the machine under low pressure state, and the second stage is filled and is filled for the accurate filling, the filling of the refrigerant volume in the accurate control refrigerant jar. According to the invention, the refrigerant automatic filling process of the air-conditioning system is divided into a first filling stage and a second filling stage, manual judgment and operation are not needed, when the amount of the refrigerant in the refrigerant tank is low, the refrigerant filling valve can be controlled according to the pressure parameter of the system to perform first-stage filling, namely rapid filling, without starting the air-conditioning system, so that the rapidity of refrigerant filling is ensured, meanwhile, the second-stage filling, namely accurate filling, is controlled to be started according to the temperature change rate of the heat exchanger tube temperature, the accuracy of refrigerant filling is ensured, and the problems of time waste, low accuracy and easy damage to the service life of the system caused by manual judgment and operation are solved.
Fig. 2 shows a flow chart of a method for controlling refrigerant charging according to another embodiment of the present invention. The control method for refrigerant charging comprises the following steps:
and 212, controlling the refrigerant filling valve to enter the second stage for filling when the temperature change rate is smaller than the preset temperature change rate.
In the embodiment, the temperature of the heat exchanger tube is acquired at a preset frequency, the temperature change rate is calculated, whether the temperature change rate is smaller than the preset temperature change rate is further judged, and when the temperature change rate is smaller than the preset temperature change rate, the filling process of the first stage is close to saturation, and the refrigerant filling valve is controlled to enter the second filling stage for accurate filling; when the temperature change rate is more than or equal to the preset temperature change rate, the filling process in the first stage is not close to saturation, the temperature of the heat exchanger tube needs to be continuously and quickly filled, the temperature of the heat exchanger tube is continuously obtained at the preset frequency, so that the system enters the second filling stage when the refrigerant amount in the refrigerant tank reaches a certain amount, and the filling rapidity of the first filling stage is ensured.
Fig. 3 shows a flow chart of a method for controlling refrigerant charging according to yet another embodiment of the present invention. The control method for refrigerant charging comprises the following steps:
and step 316, controlling the refrigerant filling valve to close to finish the second-stage filling when the difference between the exhaust temperature and the saturation temperature corresponding to the exhaust pressure is in a preset interval.
In this embodiment, after the system enters the second stage, when the difference between the exhaust temperature and the saturation temperature corresponding to the exhaust pressure is in the preset interval, it indicates that the refrigerant tank does not need to be refilled with the refrigerant, and then the refrigerant filling valve is controlled to be closed, and the second-stage filling is stopped, so that the accuracy of the second-stage filling is ensured, and the excessive filling is prevented.
In an embodiment of the present invention, preferably, before the step of controlling the refrigerant charging valve to perform the first-stage charging, the method further includes: the air conditioner is pumped to a vacuum state.
In the embodiment, the air conditioner is pumped to a vacuum state, the exhaust pressure and the exhaust temperature of the air conditioner are prevented from being too high, and the performance of the air conditioner is not affected.
In one embodiment of the present invention, preferably, the rate of temperature change of the heat exchanger tube temperature is a ratio of a difference between the current heat exchanger tube temperature and the previously detected heat exchanger tube temperature to a preset frequency.
In this embodiment, the temperature change rate of the heat exchanger tube temperature is calculated, and the refrigerant charging valve is further controlled to be closed to enter the second charging stage according to the temperature change rate, so that the automatic charging process is ensured.
In an embodiment of a second aspect of the present invention, a refrigerant charging control system is provided, where the refrigerant charging control system is used for an air conditioner, the air conditioner includes an air conditioner outdoor unit, a refrigerant tank, a refrigerant charging valve, and a heat exchanger tube temperature sensor, and fig. 4a shows a schematic block diagram of the refrigerant charging control system according to an embodiment of the present invention. The control system 400 for refrigerant charging includes:
a first obtaining unit 402, configured to obtain a system pressure parameter;
the first control unit 404 is configured to control the refrigerant charging valve to perform first-stage charging when the system pressure parameter is lower than a preset pressure parameter;
a second obtaining unit 406, configured to obtain a temperature change rate of a heat exchanger tube temperature;
and the second control unit 408 is configured to control the refrigerant filling valve to enter the second stage for filling according to the temperature change rate of the heat exchanger tube temperature.
The control system for refrigerant charging provided by the invention obtains the system pressure parameter, when the system pressure parameter is lower than the preset pressure parameter, the quantity of the refrigerant in the refrigerant tank is less, the refrigerant needs to be charged, and at this time, the refrigerant charging valve is controlled to be opened for first-stage charging; the temperature change rate of obtaining heat exchanger tube temperature in real time, fill the filling valve and get into the second stage according to the temperature change rate control refrigerant and fill, wherein, the first stage is filled and is filled for filling fast, makes the refrigerant volume in the refrigerant jar can promote fast, judges system pressure parameter simultaneously, has ensured that the system can not fill the refrigerant for the operation of opening the machine under low pressure state, and the second stage is filled and is filled for the accurate filling, the filling of the refrigerant volume in the accurate control refrigerant jar. According to the invention, the refrigerant automatic filling process of the air-conditioning system is divided into a first filling stage and a second filling stage, manual judgment and operation are not needed, when the amount of the refrigerant in the refrigerant tank is low, the refrigerant filling valve can be controlled according to the pressure parameter of the system to perform first-stage filling, namely rapid filling, without starting the air-conditioning system, so that the rapidity of refrigerant filling is ensured, meanwhile, the second-stage filling, namely accurate filling, is controlled to be started according to the temperature change rate of the heat exchanger tube temperature, the accuracy of refrigerant filling is ensured, and the problems of time waste, low accuracy and easy damage to the service life of the system caused by manual judgment and operation are solved.
Fig. 4b shows a schematic block diagram of a control system for refrigerant charging according to another embodiment of the present invention. The control system 400 for refrigerant charging includes:
a first obtaining unit 402, configured to obtain a system pressure parameter;
the first control unit 404 is configured to control the refrigerant charging valve to perform first-stage charging when the system pressure parameter is lower than a preset pressure parameter;
a second obtaining unit 406, configured to obtain a temperature change rate of a heat exchanger tube temperature;
the second obtaining unit 406 specifically includes:
a third obtaining unit 4062, configured to obtain a tube temperature of the heat exchanger at a preset frequency;
the calculating unit 4064 is used for calculating the temperature change rate of the heat exchanger tube temperature;
the second control unit 408 is configured to control the refrigerant filling valve to enter a second stage for filling according to a temperature change rate of a heat exchanger tube temperature;
the second control unit 408 specifically includes:
a judging unit 4082, configured to judge whether the temperature change rate is smaller than a preset temperature change rate;
the third control unit 4084 is configured to control the refrigerant charging valve to perform second-stage charging when the temperature change rate is smaller than the preset temperature change rate; and
and when the temperature change rate is greater than or equal to the preset temperature change rate, returning to continuously obtain the temperature of the heat exchanger tube at the preset frequency.
In the embodiment, the temperature of the heat exchanger tube is acquired at a preset frequency, the temperature change rate is calculated, whether the temperature change rate is smaller than the preset temperature change rate is further judged, and when the temperature change rate is smaller than the preset temperature change rate, the filling process of the first stage is close to saturation, and the refrigerant filling valve is controlled to enter the second filling stage for accurate filling; when the temperature change rate is more than or equal to the preset temperature change rate, the filling process in the first stage is not close to saturation, the temperature of the heat exchanger tube needs to be continuously and quickly filled, the temperature of the heat exchanger tube is continuously obtained at the preset frequency, so that the system enters the second filling stage when the refrigerant amount in the refrigerant tank reaches a certain amount, and the filling rapidity of the first filling stage is ensured.
Fig. 4c shows a schematic block diagram of a control system for refrigerant charging according to yet another embodiment of the present invention. The control system 400 for refrigerant charging includes:
a first obtaining unit 402, configured to obtain a system pressure parameter;
the first control unit 404 is configured to control the refrigerant charging valve to perform first-stage charging when the system pressure parameter is lower than a preset pressure parameter;
a second obtaining unit 406, configured to obtain a temperature change rate of a heat exchanger tube temperature;
the second obtaining unit 406 specifically includes:
a third obtaining unit 4062, configured to obtain a tube temperature of the heat exchanger at a preset frequency;
the calculating unit 4064 is used for calculating the temperature change rate of the heat exchanger tube temperature;
the second control unit 408 is configured to control the refrigerant filling valve to enter a second stage for filling according to a temperature change rate of a heat exchanger tube temperature;
the second control unit 408 specifically includes:
a judging unit 4082, configured to judge whether the temperature change rate is smaller than a preset temperature change rate;
the third control unit 4084 is configured to control the refrigerant charging valve to perform second-stage charging when the temperature change rate is smaller than the preset temperature change rate; and
when the temperature change rate is larger than or equal to the preset temperature change rate, returning to continuously obtain the temperature of the heat exchanger tube at the preset frequency;
a fourth obtaining unit 4086, configured to obtain the exhaust temperature and the exhaust pressure when the temperature change rate is smaller than a preset temperature change rate;
and a fourth control unit 4088, configured to control the refrigerant filling valve to close when a difference between the exhaust temperature and a saturation temperature corresponding to the exhaust pressure is within a preset interval.
In this embodiment, after the system enters the second stage, when the difference between the exhaust temperature and the saturation temperature corresponding to the exhaust pressure is in the preset interval, it indicates that the refrigerant tank does not need to be refilled with the refrigerant, and then the refrigerant filling valve is controlled to be closed, and the second-stage filling is stopped, so that the accuracy of the second-stage filling is ensured, and the excessive filling is prevented.
In one embodiment of the present invention, preferably, the air conditioner is pumped to a vacuum state before the step of controlling the refrigerant charging valve to perform the first-stage charging.
In the embodiment, the air conditioner is pumped to a vacuum state, the exhaust pressure and the exhaust temperature of the air conditioner are prevented from being too high, and the performance of the air conditioner is not affected.
In one embodiment of the present invention, preferably, the rate of temperature change of the heat exchanger tube temperature is a ratio of a difference between the current heat exchanger tube temperature and the previously detected heat exchanger tube temperature to a preset frequency.
In this embodiment, the temperature change rate of the heat exchanger tube temperature is calculated, and the refrigerant charging valve is further controlled to be closed to enter the second charging stage according to the temperature change rate, so that the automatic charging process is ensured.
In an embodiment of the third aspect of the present invention, an air conditioner is provided, including any one of the above refrigerant charging control systems.
The air conditioner according to the present invention includes the above-mentioned refrigerant charging control system, and thus has all the advantages of the refrigerant charging control system, which are not described herein again.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. The control method for refrigerant charging is used for an air conditioner, the air conditioner comprises an air conditioner outdoor unit, a refrigerant tank, a refrigerant charging valve and a heat exchanger tube temperature sensor, the refrigerant charging valve is connected with the refrigerant tank to control refrigerant charging into the refrigerant tank, and the control method for refrigerant charging comprises the following steps:
acquiring a system pressure parameter;
when the system pressure parameter is lower than a preset pressure parameter, controlling the refrigerant filling valve to perform first-stage filling, wherein the first-stage filling is rapid filling;
acquiring the temperature change rate of the heat exchanger tube temperature;
controlling the refrigerant filling valve to enter a second stage for filling according to the temperature change rate of the heat exchanger tube temperature, wherein the second stage filling is accurate filling;
wherein the temperature change rate of the heat exchanger tube temperature is obtained; controlling the refrigerant filling valve to enter a second stage filling step according to the temperature change rate of the temperature of the heat exchanger tube, and specifically comprising the following steps of:
acquiring the tube temperature of the heat exchanger at a preset frequency;
calculating the temperature change rate of the heat exchanger tube temperature;
judging whether the temperature change rate is smaller than a preset temperature change rate or not;
and when the temperature change rate is smaller than the preset temperature change rate, controlling the refrigerant filling valve to enter the second stage for filling.
2. The method of controlling refrigerant charge according to claim 1, wherein the obtaining of the temperature change rate of the heat exchanger tube temperature; controlling the refrigerant filling valve to enter a second stage filling step according to the temperature change rate of the temperature of the heat exchanger tube, and specifically further comprising the following steps:
and when the temperature change rate is larger than or equal to the preset temperature change rate, returning to continuously obtain the temperature of the heat exchanger tube at the preset frequency.
3. The method for controlling refrigerant charging according to claim 2, wherein after the step of controlling the refrigerant charging valve to enter the second stage charging according to the temperature change rate of the heat exchanger tube temperature, the method further comprises:
acquiring exhaust temperature and exhaust pressure;
and when the difference between the exhaust temperature and the saturation temperature corresponding to the exhaust pressure is in a preset interval, controlling the refrigerant filling valve to be closed to finish the second-stage filling.
4. The method as claimed in any one of claims 1 to 3, wherein the step of controlling the refrigerant charging valve to perform the first-stage charging further comprises:
and pumping the air conditioner to a vacuum state.
5. The method as claimed in any one of claims 1 to 3, wherein the step of controlling the refrigerant charge is further performed,
the temperature change rate of the heat exchanger tube temperature is the ratio of the difference between the current heat exchanger tube temperature and the heat exchanger tube temperature detected at the previous time to the preset frequency.
6. The utility model provides a control system that refrigerant filled fills for the air conditioner, the air conditioner includes air condensing units, refrigerant jar, refrigerant fill valve and heat exchanger temperature sensor, its characterized in that, the control system that the refrigerant filled includes:
the first acquisition unit is used for acquiring a system pressure parameter;
the first control unit is used for controlling the refrigerant charging valve to perform first-stage charging when the system pressure parameter is lower than a preset pressure parameter, wherein the first-stage charging is rapid charging;
the second acquiring unit is used for acquiring the temperature change rate of the heat exchanger tube temperature;
the second control unit is used for controlling the refrigerant filling valve to enter a second stage filling according to the temperature change rate of the heat exchanger tube temperature, and the second stage filling is accurate filling;
the second obtaining unit specifically includes:
the third acquiring unit is used for acquiring the temperature of the heat exchanger tube at a preset frequency;
the calculating unit is used for calculating the temperature change rate of the heat exchanger tube temperature;
the second control unit specifically includes:
the judging unit is used for judging whether the temperature change rate is smaller than a preset temperature change rate or not;
and the third control unit is used for controlling the refrigerant charging valve to perform the second-stage charging when the temperature change rate is smaller than the preset temperature change rate.
7. The system as claimed in claim 6, wherein the control unit is configured to control the refrigerant charge,
and the third control unit is also used for returning to continuously acquire the temperature of the heat exchanger tube at a preset frequency when the temperature change rate is greater than or equal to the preset temperature change rate.
8. The system as claimed in claim 7, wherein the second control unit further comprises:
a fourth obtaining unit configured to obtain an exhaust temperature and an exhaust pressure when the temperature change rate is smaller than the preset temperature change rate;
and the fourth control unit is used for controlling the refrigerant filling valve to be closed when the difference between the exhaust temperature and the saturation temperature corresponding to the exhaust pressure is in a preset interval.
9. The system as claimed in any one of claims 6 to 8, wherein the control system is configured to control the refrigerant charge,
before the step of controlling the refrigerant charging valve to perform first-stage charging, the air conditioner is pumped to a vacuum state.
10. The system as claimed in any one of claims 6 to 8, wherein the control system is configured to control the refrigerant charge,
the temperature change rate of the heat exchanger tube temperature is the ratio of the difference between the current heat exchanger tube temperature and the heat exchanger tube temperature detected at the previous time to the preset frequency.
11. An air conditioner, comprising:
a system for controlling refrigerant charge as claimed in any one of claims 6 to 10.
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| CN201711054149.8A CN107906807B (en) | 2017-10-31 | 2017-10-31 | Refrigerant charging control method and system and air conditioner |
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| DE19506143C2 (en) * | 1995-02-22 | 1998-01-15 | Danfoss As | Method for controlling the superheating temperature of the refrigerant in an evaporator device of a refrigeration or heat pump system and device for carrying out the method |
| CN102288251B (en) * | 2010-06-17 | 2012-10-24 | 北汽福田汽车股份有限公司 | Vehicle air conditioner refrigerant filling volume calibration method and system |
| US9874384B2 (en) * | 2016-01-13 | 2018-01-23 | Bergstrom, Inc. | Refrigeration system with superheating, sub-cooling and refrigerant charge level control |
| CN106016867A (en) * | 2016-04-28 | 2016-10-12 | 广东美的暖通设备有限公司 | Coolant charging method and system and air conditioner |
| CN107062542B (en) * | 2017-04-07 | 2019-08-30 | 广东美的暖通设备有限公司 | Air-conditioning system and its control method of outdoor fan, device |
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