CN110940040A - Refrigerant detection and filling method and air conditioning system - Google Patents
Refrigerant detection and filling method and air conditioning system Download PDFInfo
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- CN110940040A CN110940040A CN201911294501.4A CN201911294501A CN110940040A CN 110940040 A CN110940040 A CN 110940040A CN 201911294501 A CN201911294501 A CN 201911294501A CN 110940040 A CN110940040 A CN 110940040A
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
Abstract
The invention relates to the technical field of air conditioners, and particularly provides a refrigerant detection and filling method and an air conditioning system. The refrigerant detection and filling method comprises the following steps: the air conditioning system automatically detects whether the refrigerant is missing; and if the refrigerant is missing, the air conditioning system automatically fills the refrigerant into a refrigeration cycle system of the air conditioning system, the air conditioning system stably operates for a preset time after the refrigerant with preset mass is filled, and then whether the refrigerant is missing or not is continuously and automatically detected. The refrigerant detection and filling method and the air conditioning system can automatically fill a proper amount of refrigerant under the condition of refrigerant deficiency until the refrigerant is replenished, ensure the refrigeration effect of the air conditioning system, and do not need professional maintenance personnel to maintain on the door.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a refrigerant detection and filling method and an air conditioning system.
Background
Refrigerant leakage often occurs after the air conditioning and refrigeration system is operated for a period of time. After the refrigerant leaks, the refrigerant of the air-conditioning refrigeration system is insufficient, so that the air-conditioning refrigeration effect is poor.
In the prior art, the refrigerant deficiency is mainly identified by two methods: firstly, whether the refrigerant is lost or not is presumed by means of subjective perception of the refrigeration effect of the air conditioner by people; and secondly, detecting whether the refrigerant is leaked or not by adopting a complex monitoring method. No matter which method is adopted, after the refrigerant is judged to be lost, professional air conditioner maintenance personnel are required to get on the door for maintenance, and the refrigerant is added manually, so that the method is not beneficial to users and increases the maintenance cost.
Disclosure of Invention
To solve at least one aspect of the above technical problems to some extent, the present invention provides a refrigerant detecting and filling method and an air conditioning system.
The air conditioning system automatically detects whether the refrigerant is missing;
and if the refrigerant is missing, the air conditioning system automatically fills the refrigerant into a refrigeration cycle system of the air conditioning system, the air conditioning system stably operates for a preset time after the refrigerant with preset mass is filled, and then whether the refrigerant is missing or not is continuously and automatically detected.
Compared with the prior art, the method can automatically fill the refrigerant into the refrigeration cycle system after detecting the lack of the refrigerant of the air conditioning system. After each refrigerant with preset mass is filled, the air conditioner is stably operated for preset time, and then the refrigerant is detected and refilled until the air conditioning system is detected to be free from the lack of the refrigerant, so that the proper amount of the filled refrigerant is ensured, and the excessive or insufficient amount of the filled refrigerant is avoided. Meanwhile, the trouble and cost of professional personnel for door-to-door maintenance are saved.
Optionally, the detecting whether the air conditioning system is lack of refrigerant specifically includes:
acquiring an indoor air inlet and outlet temperature difference;
and comparing the air inlet and outlet temperature difference with a preset range, and if the air inlet and outlet temperature difference is not within the preset range, judging that the refrigerant of the air conditioning system is absent.
Compared with the prior art, the method for judging whether the refrigerant is lacked or not is judged by comparing the temperature difference of the inlet air and the outlet air with the preset range, and the judging method is effective and simpler.
Optionally, obtaining the indoor air inlet and outlet temperature difference specifically includes:
acquiring the temperature of an air inlet and the temperature of an air outlet of the air conditioning system;
and calculating the temperature difference of the inlet air and the outlet air according to the temperature of the air inlet and the temperature of the air outlet.
The air inlet and outlet temperature difference is obtained by calculation according to the air inlet temperature and the air outlet temperature, and the operation is simple. For example, the inlet temperature and the outlet temperature may be provided by temperature sensors at the inlet and outlet of the air conditioning system.
Optionally, the preset range is determined according to an operation mode of the air conditioning system and an indoor ambient temperature.
Optionally, the preset range is determined according to the operation mode of the air conditioning system and the indoor ambient temperature, and specifically includes:
when the air conditioning system is in a refrigeration mode, the preset range is determined according to a first preset table and the indoor environment temperature;
and when the air conditioning system is in a heating mode, the preset range is determined according to a second preset table and the indoor environment temperature.
Optionally, the preset quality and the preset time are both determined according to an operation mode of the air conditioning system and an indoor ambient temperature.
Optionally, the preset quality and the preset time are determined according to the operation mode of the air conditioning system and the indoor ambient temperature, and specifically include:
when the air conditioning system is in a cooling mode, the preset quality and the preset time are determined according to a third preset table and the indoor environment temperature;
and when the air conditioning system is in a heating mode, the preset quality and the preset time are determined according to a fourth preset table and the indoor environment temperature.
The preset range, the preset quality and the preset time of the invention can be determined by the operation mode and the indoor environment temperature, and the operation mode and the indoor environment temperature of the air conditioning system belong to conventional parameters, so the air conditioning system can adjust the preset range, the preset quality and the preset time in time according to the parameters, thereby ensuring the accuracy of refrigerant loss detection and the accuracy of refrigerant filling quality.
Another object of the present invention is to provide an air conditioning system, comprising:
the detection unit is used for detecting whether the air conditioning system is lack of refrigerant;
and the control execution unit is used for filling the refrigerant into a refrigeration cycle system of the air conditioning system if the refrigerant is absent, and enabling the air conditioning system to stably operate for a preset time after the refrigerant with preset mass is filled.
Optionally, the control execution unit includes:
a refrigeration cycle system and a refrigerant adding device;
the refrigerant adding device is arranged between an evaporator and a compressor of the refrigeration cycle system and used for adding a refrigerant to the refrigeration cycle system.
The refrigerant adding device is arranged between the evaporator and the compressor, and the refrigerant is added at the position due to the low-pressure outlet between the evaporator and the compressor, so that the stability of the system can be ensured, and the safety risk caused by high-pressure impact in the refrigerant adding process can be avoided as much as possible.
Optionally, at least a first branch and a second branch in parallel are arranged between the evaporator and the compressor;
the refrigerant adding device comprises a first control valve, a second control valve and a refrigerant tank, the first control valve and the second control valve are all arranged on the first branch path, and the first control valve and the second control valve are respectively arranged on two sides of the refrigerant tank.
The refrigerant adding device is arranged on the parallel branch between the evaporator and the compressor, so that the refrigeration cycle system can be ensured to normally operate when the refrigerant is not added.
Optionally, the first control valve and the second control valve are both time-delayed when opened and closed. The first control valve and the second control valve are not instantaneously actuated whether being opened or closed, namely, the opening and the closing of the first control valve and the second control valve have enough time delay duration, so that the instable operation of the system caused by instantaneous valve opening and closing is prevented.
Optionally, the detection unit includes: the air conditioner comprises an air inlet temperature sensor and an air outlet temperature sensor, wherein the air inlet temperature sensor is arranged at an air inlet of the air conditioning system, and the air outlet temperature sensor is arranged at an air outlet of the air conditioning system. Temperature sensors are arranged at the air inlet and the air outlet of the air conditioning system and are respectively used for collecting the air inlet temperature and the air outlet temperature.
Drawings
FIG. 1 is a schematic flow diagram of a refrigerant detection and charging method according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating the process of detecting whether the air conditioning system is out of refrigerant according to the embodiment of the present invention;
fig. 3 is a schematic view of a refrigeration cycle system of an air conditioning system according to an embodiment of the present invention.
Description of reference numerals:
1-a compressor; 2-a condenser; 3-a throttling element; 4-an evaporator; 5-a refrigerant tank; 61-a first control valve; 62-second control valve.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The refrigerant detection and filling method provided by the invention is mainly used for automatic detection and automatic filling of the refrigerant of the air conditioning system. Air conditioning systems generally include a circulating refrigeration system including at least a compressor, a condenser, and an evaporator. The compressor, the condenser and the evaporator are sequentially connected in a closed loop manner to form a circulation loop.
The indoor environment is used for cooling, namely an air conditioning system is operated in a refrigerating mode, low-pressure steam of a refrigerant in a circulating refrigerating system is sucked by a compressor and compressed into high-pressure high-temperature steam, and then the high-pressure high-temperature steam is discharged to a condenser, outdoor air sucked by an axial flow fan flows through the condenser to take away heat emitted by the refrigerant, so that the high-pressure refrigerant steam is condensed into high-pressure liquid, the high-pressure liquid enters an evaporator, the pressure and the temperature are sharply reduced, the high-pressure liquid is evaporated under corresponding low pressure to absorb ambient heat, meanwhile, indoor air continuously enters the evaporator through a cross flow fan to exchange heat, and the air which is cooled after heat release is sent to the indoor, so that the indoor air continuously circulates and flows. The heat flow of the indoor environment heating process is opposite to the above process, but the principle is consistent, and the detailed description is omitted here.
However, if the refrigerant of the refrigeration cycle is lost due to leakage or the like, the cooling or heating effect is deteriorated. At present, whether the refrigerant is lost or not is presumed mainly by means of subjective perception of the refrigeration/heating effect of the air conditioner by people, and after the refrigerant is judged to be lost, professional air conditioner maintenance personnel are required to get on the door for maintenance, and the refrigerant is added manually, so that the use of users is not facilitated, and the maintenance cost is increased.
The air conditioning system can automatically judge whether the refrigeration cycle system is lack of the refrigerant or not by detecting the collectable parameters; and a refrigerant adding device is arranged between a compressor and an evaporator of the refrigeration cycle system, and when the refrigerant is detected to be missing, the refrigerant can be automatically supplemented to the refrigeration cycle system.
Specifically, as shown in fig. 1, the present embodiment provides a refrigerant detecting and filling method, including:
detecting whether the air conditioning system is lack of refrigerant;
and if the refrigerant is absent, filling the refrigerant into a refrigeration cycle system of the air-conditioning system, after the refrigerant with preset mass is filled, enabling the air-conditioning system to stably operate for preset time, and then continuously detecting whether the refrigerant of the air-conditioning system is absent. And if the refrigerant is not deficient, the air-conditioning system continues to operate according to the original operation state, and the detection of whether the refrigerant is deficient or not is continuously carried out.
The refrigerant detection and filling method can be implemented by adopting the following air conditioning system. The air conditioning system can comprise a circulating refrigeration system and a refrigerant adding device, wherein the circulating refrigeration system consists of a compressor, a condenser, an evaporator and the like. The compressor, the condenser and the evaporator are sequentially connected in a closed loop mode to form a circulation loop, and the refrigerant adding device is arranged between the compressor and the evaporator in parallel. When the refrigerant is detected to be absent, the refrigerant can be automatically supplemented to the refrigeration cycle system through the refrigerant adding device. The refrigerant adding device comprises a control valve and a refrigerant tank, when the control valve is opened, the refrigerant stored in the refrigerant tank is filled into the refrigeration cycle system, and when the control valve is closed, the refrigerant tank cannot add the refrigerant to the refrigeration cycle system. The opening and closing of the control valve are both performed slowly, preventing the system from being unstable.
The embodiment is a circulation process, after a refrigerant loss is detected, firstly, a refrigerant with a preset quality C is filled into a refrigeration cycle system of an air conditioning system, then the air conditioning system is enabled to stably operate for a preset time tp, then, whether the air conditioning system is in the refrigerant loss is detected again, if the refrigerant loss is still detected, the refrigerant with the preset quality C is continuously filled, the air conditioning system is enabled to stably operate for the preset time tp again, the circulation is carried out until the refrigerant loss of the air conditioning system is detected, the filling of the refrigerant is stopped, and the air conditioning system recovers the original operation state.
In the embodiment, whether the air-conditioning system is lack of the refrigerant can be automatically monitored in real time, and the refrigerant can be supplemented in time, so that the continuous and effective operation of the air-conditioning system is ensured, and the user experience is improved; professional personnel do not need to visit the door for maintenance, and the cost is saved on the basis of reducing the failure rate. In addition, in the process of automatically filling the refrigerant into the refrigeration cycle system, after the refrigerant with preset quality is filled, the air conditioner is stably operated for preset time, and then the refrigerant is detected and refilled, so that the proper amount of the filled refrigerant can be ensured, and the refrigerant is not too much or too little.
As shown in fig. 2, preferably, the step of detecting whether the air conditioning system is lack of refrigerant includes:
acquiring an indoor air inlet and outlet temperature difference;
and comparing the air inlet and outlet temperature difference with a preset range, and if the air inlet and outlet temperature difference is not in the preset range, judging that the refrigerant of the air-conditioning system is lost. And if the temperature difference of the inlet air and the outlet air is within the preset range, judging that the refrigerant of the air-conditioning system is not lost.
For convenience and clarity of description, the temperature difference between the inlet air and the outlet air is represented by a symbol delta T, and the preset range is (A-B) to (A + B). And when the delta T is more than or equal to (A-B) and less than or equal to (A + B), the temperature difference delta T of the inlet air and the outlet air is considered to be in a preset range, otherwise, the temperature difference delta T of the inlet air and the outlet air is considered not to be in the preset range.
Optionally, obtaining the indoor air inlet and outlet temperature difference specifically includes:
and acquiring the temperature of an air inlet and the temperature of an air outlet of the air conditioning system.
And calculating the temperature difference of the inlet air and the outlet air according to the temperature of the air inlet and the temperature of the air outlet.
In this embodiment, the air inlet and outlet temperature difference is a difference between the temperature of the air inlet and the temperature of the air outlet of the indoor unit of the air conditioning system. Because the air conditioning system can work in a cooling mode and a heating mode respectively, the temperature difference between the inlet air and the outlet air is as follows: the difference value is obtained by subtracting the lower temperature from the higher temperature in the air inlet temperature and the air outlet temperature. For example, in the cooling mode, the temperature of the air inlet is 27 ℃, the temperature of the air outlet is 12 ℃, and the temperature difference between the inlet air and the outlet air is 27-12 ℃ and 15 ℃; in the heating mode, the temperature of the air inlet is 20 ℃, the temperature of the air outlet is 40 ℃, and the temperature difference between the inlet air and the outlet air is 40-20 ℃ to 20 ℃.
Compared with a complex calculation detection method in the prior art, the method for judging whether the refrigerant is lacked or not is simpler by comparing the temperature difference of the inlet air and the outlet air with the preset range. Under the condition that the working condition (the working condition refers to that the air conditioning system is in a cooling mode or a heating mode), namely under the condition that the refrigerating capacity, the air speed and the like are fixed, the temperature difference of the inlet air and the outlet air of the indoor unit of the air conditioning system is determined, because the refrigerating capacity is calculated by multiplying the enthalpy difference of the inlet air and the outlet air by the air quantity. However, due to different use environments, air humidity and the like are different, and the temperature difference between inlet air and outlet air has a fluctuation range. However, in general, the enthalpy difference can be obtained by judging the temperature difference of the inlet air and the outlet air, so as to calculate the refrigerating capacity, and if the refrigerating capacity is less than the working condition set value, the refrigerant is lost.
Alternatively, the preset range is determined according to an operation mode of the air conditioning system and an indoor ambient temperature. The operation mode refers to a cooling mode or a heating mode, and under different operation modes and different indoor environment temperatures, the preset ranges (A +/-B) are different, namely the values of A and B are different.
Preferably, the preset range is determined according to an operation mode of the air conditioning system and an indoor ambient temperature, and specifically includes:
when the air conditioning system is in a refrigeration mode, a preset range is determined according to a first preset table and the indoor environment temperature; and when the air conditioning system is in a heating mode, determining the preset range according to a second preset table and the indoor environment temperature.
Wherein, the first preset table is as shown in the following table 1:
for example, when the air conditioning system is operated in the cooling mode, if the ambient temperature is 35 ℃, a may be set to 17, and B may be set to 2, and when the difference between the inlet and outlet air temperatures is detected to be in the range of 15 ℃ ((a-B)) to 19 ℃ (a + B), it is determined that the refrigerant of the air conditioning system is not missing, and conversely, it may be determined that the refrigerant is missing.
The second preset table is shown in table 2 below:
for example, when the air conditioning system operates in the heating mode, if the ambient temperature is 8 ℃, a may be set to 22, and B may be set to 2, and it may be determined that the refrigerant of the air conditioning system is not missing when the temperature difference between the inlet and outlet air is in the range of 20 ℃ ((a-B)) to 24 ℃ (a + B), and it may be determined that the refrigerant is missing otherwise.
Preferably, the preset quality and the preset time are determined according to an operation mode of the air conditioning system and an indoor ambient temperature. The operation mode of the air conditioning system herein refers to a cooling mode or a heating mode. When the air conditioning system operates in different operation modes and the indoor environment temperature is different, the preset quality C of the refrigerant filled each time and the preset time tp for the air conditioning system to stably operate after the refrigerant is filled are different in value. For clarity, the subsequent preset masses C are all in g (grams) and the preset times tp are all in min (minutes).
Further, the preset quality and the preset time are determined according to the operation mode of the air conditioning system and the indoor environment temperature, and specifically include:
when the air conditioning system is in a cooling mode, the preset quality and the preset time are determined according to a third preset table and the indoor environment temperature;
and when the air conditioning system is in a heating mode, the preset quality and the preset time are determined according to a fourth preset table and the indoor environment temperature.
In the third preset table, specific values of C and tp along with the change of the indoor environment temperature when the air-conditioning system operates in the refrigeration mode are given; in the fourth preset table, specific values of C and tp along with the change of the indoor environment temperature are given under the heating mode of the air conditioning system.
The third preset table is shown in table 3 below:
the fourth preset table is shown in table 4 below:
for example, when the air conditioning system is in a cooling mode and the indoor environment temperature is 25 ℃, after detecting that the refrigerant of the air conditioning system is missing, 50g of the refrigerant can be filled into a cooling circulation system of the air conditioning system, then the air conditioning system is stably operated for 10 minutes, then the step of detecting whether the refrigerant of the air conditioning system is missing is executed, if the refrigerant is still missing, the refrigerant is continuously filled by the method, if the refrigerant is not missing, the refrigerant filling is stopped, and the air conditioning system is continuously operated after recovering the original state.
In the above embodiments, the air conditioning system is in a normal working condition, that is, when the heating ambient temperature is-15 to 24 ℃ and the cooling ambient temperature is 16 to 45 ℃, the implementation effect is better.
Another embodiment of the present invention provides an air conditioning system including:
the detection unit is used for detecting whether the air conditioning system is lack of refrigerant;
and the control execution unit is used for filling the refrigerant into a refrigeration cycle system of the air conditioning system if the refrigerant is absent, and enabling the air conditioning system to stably operate for a preset time after the refrigerant with preset mass is filled.
The control execution unit comprises a main control unit, a refrigeration circulation system and a refrigerant adding device. The main control unit is used for controlling the refrigerant adding device to fill refrigerant into a refrigeration cycle system of the air conditioning system, and after the refrigerant with preset mass is filled, the air conditioning system stably operates for preset time.
Optionally, the detection unit comprises: air inlet temperature sensor and air outlet temperature sensor. The air inlet temperature sensor is fixedly arranged at the position of an air inlet of the air conditioning system. The air outlet temperature sensor is fixedly arranged at the air outlet of the air conditioning system. The air inlet temperature sensor is used for collecting air inlet temperature, and the air outlet temperature sensor is used for collecting air outlet temperature.
As shown in fig. 3, preferably, the refrigeration cycle system includes a compressor 1, a condenser 2, a throttling element 3, and an evaporator 4, which are sequentially connected in a closed loop. The refrigerant adding device is arranged between the evaporator 4 and the compressor 1 of the refrigeration cycle system, and a control valve is arranged between the refrigerant adding device and the refrigeration cycle system and used for controlling whether the refrigerant adding device adds the refrigerant to the refrigeration cycle system or not.
Illustratively, the refrigerant adding device includes a refrigerant tank 5 and a control valve, and the control valve is disposed between the refrigerant tank and a refrigeration cycle system of the air conditioning system. When the main control unit controls the control valve to be opened, the refrigerant in the refrigerant tank flows into the refrigeration cycle system; when the main control unit controls the control valve to close, the refrigerant tank stops filling the refrigerant into the refrigeration cycle system.
According to the invention, the refrigerant adding device is arranged between the evaporator 4 and the compressor 1, and the low-pressure outlet is arranged between the evaporator 4 and the compressor 1, so that the refrigerant is added at the position, the system stability can be ensured, and the safety risk caused by high-pressure impact in the refrigerant adding process can be avoided as much as possible.
Preferably, at least a first branch and a second branch are arranged between the evaporator 4 and the compressor 1 in parallel, the refrigerant adding device is arranged on the first branch, the control valves comprise a first control valve 61 and a second control valve 62, and the first control valve 61 and the second control valve 62 are both arranged on the first branch and are respectively arranged on two sides of the refrigerant tank 5.
The first branch may not be assembled on the type of air conditioner that does not require the refrigerant detection and charging functions. On the air conditioner type needing to be provided with refrigerant detection and filling, the first branch can be conveniently connected to the second branch in parallel. The structure provides great convenience for the transformation and maintenance of the air conditioner. And, set up the refrigerant adding device on the parallel branch between compressor 1 and the evaporator 4, guarantee when not filling the refrigerant, the refrigerating cycle system operates as usual.
The above embodiments are merely exemplary illustrations of the refrigerant adding device, and actually, the specific structure of the refrigerant adding device may be changed variously, for example, the refrigerant tank 5 may be communicated with the first branch line through a control valve; or the refrigerant adding device is directly communicated with the pipeline of the second branch circuit through a control valve. The refrigerant charge is now added directly to the second branch.
Preferably, the opening and closing of the first control valve 61 and the second control valve 62 of the refrigerant adding device are delayed. That is, the valve opening and closing of the first control valve 61 and the second control valve 62 are not instantaneous, and are slow opening or closing processes, and the slow opening and closing processes require a certain time period, which is a time delay period. Therefore, the opening degree of the passage of the valve is gradually changed, and unstable system operation caused by instantaneous valve opening and closing can be avoided. In the case where the refrigerant tank 5 is communicated with the refrigeration cycle system only through one control valve, the valve opening and closing of the control valve is still delayed, and will not be described herein again.
In the above embodiment, the refrigerant tank 5 is configured to automatically fill the refrigerant into the refrigeration cycle. However, when the refrigerant in the refrigerant tank 5 is insufficient, the air conditioning system will give an alarm, and at this time, the refrigerant needs to be added to the refrigerant tank 5. For example, the refrigerant in the refrigerant tank 5 may be reduced to 10% to be set as an alarm threshold, and an alarm may be issued when the refrigerant is less than 10% of the refrigerant tank capacity. The amount of refrigerant in the refrigerant tank 5 can be obtained by a detection method such as liquid level detection.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (12)
1. A method of refrigerant detection and filling, comprising:
the air conditioning system automatically detects whether the refrigerant is missing;
and if the refrigerant is missing, the air conditioning system automatically fills the refrigerant into a refrigeration cycle system of the air conditioning system, the air conditioning system stably operates for a preset time after the refrigerant with preset mass is filled, and then whether the refrigerant is missing or not is continuously and automatically detected.
2. The refrigerant detecting and filling method according to claim 1, wherein the air conditioning system automatically detects whether the refrigerant is missing, specifically comprising:
acquiring an indoor air inlet and outlet temperature difference;
and comparing the air inlet and outlet temperature difference with a preset range, and if the air inlet and outlet temperature difference is not within the preset range, judging that the refrigerant of the air conditioning system is absent.
3. The refrigerant detecting and filling method according to claim 2, wherein the obtaining of the indoor air inlet and outlet temperature difference specifically comprises:
acquiring the temperature of an air inlet and the temperature of an air outlet of the air conditioning system;
and calculating the temperature difference of the inlet air and the outlet air according to the temperature of the air inlet and the temperature of the air outlet.
4. The refrigerant detection and charging method as set forth in claim 2, wherein said preset range is determined according to an operation mode of said air conditioning system and an indoor ambient temperature.
5. The refrigerant detecting and filling method according to claim 4, wherein the predetermined range is determined according to an operation mode of the air conditioning system and an indoor ambient temperature, and specifically comprises:
when the air conditioning system is in a refrigeration mode, the preset range is determined according to a first preset table and the indoor environment temperature;
and when the air conditioning system is in a heating mode, the preset range is determined according to a second preset table and the indoor environment temperature.
6. The refrigerant detection and charging method as recited in any one of claims 1 to 5, wherein said preset mass and said preset time are determined according to an operation mode of said air conditioning system and an indoor ambient temperature.
7. The refrigerant detecting and filling method according to claim 6, wherein the predetermined quality and the predetermined time are determined according to an operation mode of the air conditioning system and an indoor ambient temperature, and specifically comprises:
when the air conditioning system is in a cooling mode, the preset quality and the preset time are determined according to a third preset table and the indoor environment temperature;
and when the air conditioning system is in a heating mode, the preset quality and the preset time are determined according to a fourth preset table and the indoor environment temperature.
8. An air conditioning system, comprising:
the detection unit is used for automatically detecting whether the refrigerant is lost or not by the air conditioning system;
and the control execution unit is used for automatically filling the refrigerant into a refrigeration cycle system of the air conditioning system by the air conditioning system if the refrigerant is missing, stably operating the air conditioning system for a preset time after the refrigerant with preset mass is filled, and then continuously and automatically detecting whether the refrigerant is missing.
9. The air conditioning system as claimed in claim 8, wherein the control performing unit comprises: a refrigeration cycle system and a refrigerant adding device;
the refrigerant adding device is arranged between an evaporator (4) and a compressor (1) of the refrigeration cycle system and used for adding a refrigerant to the refrigeration cycle system.
10. An air conditioning system according to claim 9, wherein at least a first branch and a second branch are provided in parallel between said evaporator and said compressor;
the refrigerant adding device comprises a first control valve (61), a second control valve (62) and a refrigerant tank (5), wherein the refrigerant tank (5), the first control valve (61) and the second control valve (62) are arranged on the first branch, and the first control valve (61) and the second control valve (62) are respectively arranged on two sides of the refrigerant tank (5).
11. Air conditioning system according to claim 9, characterized in that the first control valve (61) and the second control valve (62) are open and closed with a time delay.
12. The air conditioning system as claimed in claim 8, wherein the detection unit comprises: the air conditioner comprises an air inlet temperature sensor and an air outlet temperature sensor, wherein the air inlet temperature sensor is arranged at an air inlet of the air conditioning system, and the air outlet temperature sensor is arranged at an air outlet of the air conditioning system.
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| CN110940040B (en) | 2021-12-10 |
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