CN113513865B - Refrigerant automatic filling multi-split air conditioner system and control method thereof - Google Patents
Refrigerant automatic filling multi-split air conditioner system and control method thereof Download PDFInfo
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- CN113513865B CN113513865B CN202110731898.XA CN202110731898A CN113513865B CN 113513865 B CN113513865 B CN 113513865B CN 202110731898 A CN202110731898 A CN 202110731898A CN 113513865 B CN113513865 B CN 113513865B
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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
- F25B49/022—Compressor control arrangements
Abstract
The invention relates to a refrigerant automatic filling multi-split air conditioner system and a control method thereof, wherein the refrigerant automatic filling multi-split air conditioner system comprises an outdoor unit and an indoor unit, wherein a refrigerant circulation loop in the outdoor unit is communicated with a refrigerant circulation loop in the indoor unit through an air pipe stop valve and a liquid pipe stop valve; the refrigerant filling pipe is also included; one end of the refrigerant filling pipe is movably connected with the liquid pipe stop valve, and the other end of the refrigerant filling pipe can be connected with the refrigerant tank so as to fill refrigerant into the system. During filling, the opening of the electronic expansion valve of the indoor unit is timely adjusted by detecting the suction and exhaust temperature and the suction and exhaust pressure of the compressor, so that automatic and sufficient refrigerant addition is realized, the conventional procedures of calculation, weighing and the like are omitted, and the construction efficiency and quality are improved. Moreover, after the filling is finished, the refrigerant filling pipe can be removed, so that the adverse effect on the normal operation of the system is avoided.
Description
Technical Field
The invention relates to an air conditioner and a control method, in particular to a multi-split system and a control method, and specifically relates to an automatic refrigerant charging multi-split system and a control method thereof.
Background
The multi-connected air conditioning system has long pipelines and many indoor units, so after the multi-connected air conditioning system is installed on site, refrigerant is required to be additionally filled according to the length of the pipeline. The existing method provides a calculation method for manufacturers mostly, and an installer calculates according to the length and the diameter of the pipe actually installed and then adds the pipe quantitatively. This mode of operation has several problems:
firstly, the refrigerant adding amount is not accurately calculated due to the error of the pipe length and the pipe diameter.
Secondly, quantitative addition is required by using an electronic scale, which additionally increases the equipment cost.
Thirdly, when the user needs to keep on the side of the electronic scale to pay attention to the addition amount during the quantitative addition, the labor and the time are wasted.
Fourthly, a refrigerant filling device needs to be arranged in the outdoor unit, and the refrigerant filling device is not easy to detach, so that the use of a later system is influenced.
Therefore, the conventional quantitative adding method is complicated in operation and wastes a large amount of manpower and material resources, and improvement is urgently needed.
Disclosure of Invention
The invention aims to solve the problem of refrigerant addition of a multi-split air-conditioning system at present, and provides an automatic refrigerant filling multi-split air-conditioning system and a control method thereof, which can realize automatic refrigerant addition of a unit, avoid the operations of calculation, weighing, real-time observation and the like, improve the operation efficiency and enable the refrigerant addition amount to be more accurate.
The technical scheme of the invention is as follows:
a refrigerant automatic filling multi-split system comprises an outdoor unit and an indoor unit, wherein a refrigerant circulation loop in the outdoor unit is communicated with a refrigerant circulation loop in the indoor unit through a gas pipe stop valve and a liquid pipe stop valve; the refrigerant filling pipe is also included; one end of the refrigerant filling pipe is movably connected with the liquid pipe stop valve, and the other end of the refrigerant filling pipe can be connected with the refrigerant tank so as to fill refrigerant into the system.
Furthermore, a refrigerant filling check valve is arranged on the refrigerant filling pipe, and the refrigerant can be prevented from flowing back to the refrigerant tank.
Furthermore, the refrigerant filling pipe is connected with the liquid pipe stop valve through a nano-tube.
Further, the outdoor unit comprises a compressor, a four-way valve, an outdoor unit heat exchanger and a gas-liquid separator; four ports of the four-way valve are respectively connected with an exhaust port of the compressor, a first end of an outdoor unit heat exchanger, an inlet of a gas-liquid separator and a gas pipe stop valve; the air suction port of the compressor is connected with the outlet of the gas-liquid separator; the second end of the outdoor unit heat exchanger is connected with the liquid pipe stop valve; a bypass is arranged between the inlet of the gas-liquid separator and the liquid pipe stop valve; a bypass electromagnetic valve is arranged on the bypass; the indoor unit comprises a plurality of indoor unit heat exchangers connected in parallel; the first end of the heat exchanger of the indoor unit is connected to the air pipe stop valve, and the second end of the heat exchanger of the indoor unit is connected to the liquid pipe stop valve after passing through the indoor electronic expansion valve.
Furthermore, a gas suction temperature sensor and a gas suction pressure sensor are arranged on a pipeline between the four-way valve and the inlet of the gas-liquid separator; an exhaust temperature sensor and an exhaust pressure sensor are arranged on an exhaust port of the compressor; and an environment temperature sensor is arranged on the outdoor heat exchanger.
A control method of a refrigerant automatic charging multi-split air conditioner system comprises the following steps:
1) Manually closing the liquid pipe stop valve and opening the air pipe stop valve; connecting the filling pipe with a refrigerant tank, opening a valve on the refrigerant tank, and beginning to add the refrigerant;
2) Opening all the electronic expansion valves of the indoor units to 60 steps;
3) Detecting suction pressure LP through a suction pressure sensor, and detecting ambient temperature To through an ambient temperature sensor; if LP is larger than LP0, turning to step 4); otherwise, turning to the step 1); wherein LP0 is a set value and is changed according To;
4) Starting a compressor to enable the frequency of the compressor to be 60rps; meanwhile, opening an electronic expansion valve of the indoor unit to 90 steps;
5) Detecting exhaust pressure HP through an exhaust pressure sensor, and detecting ambient temperature To through an ambient temperature sensor; if HP is more than HP0, turning to step 6); otherwise, turning to the step 4); wherein HP0 is a set value and is changed according To;
6) Detecting an exhaust temperature Td by an exhaust temperature sensor; calculating an exhaust superheat degree Td _ sh = Td-Tc; wherein Tc is the saturation temperature corresponding to HP;
7) If Td _ sh is less than or equal to 25 ℃, turning to the step 8); otherwise, turning to the step 4);
8) Detecting a suction pressure LP by a suction pressure sensor; detecting an intake air temperature Ts by an intake air temperature sensor; calculating the suction superheat Ts _ sh = Ts-Te; wherein Te is the saturation temperature corresponding to LP;
9) If Ts _ sh is less than or equal to 5 ℃, turning to step 10); otherwise, turning to the step 4);
10 The compressor is stopped and the electronic expansion valve of the indoor unit is completely closed;
11 Refrigerant filling is completed and the refrigerant filling pipe is removed. Further, in the step 3), the determination process of LP0 is as follows:
LP0=12Bar when To > 38 ℃;
when the temperature is more than 28 ℃ and is less than or equal To 38 ℃, LP0=11Bar;
when the temperature is more than 18 ℃ and To is less than or equal To 28 ℃, LP0=10Bar;
when the temperature is more than 5 ℃ and is less than or equal To 18 ℃, LP0=9Bar;
LP0=8Bar when To ≦ 5 ℃.
Further, in the step 5), the HP0 is determined as follows:
HP =28Bar when To > 38 ℃;
when the temperature is more than 28 ℃ and To is less than or equal To 38 ℃, HP =24Bar;
HP =22Bar when To is more than 18 ℃ and less than or equal To 28 ℃;
HP =20Bar when To is more than 5 ℃ and less than or equal To 18 ℃;
HP =18Bar when To ≦ 5 ℃.
The invention has the beneficial effects that:
the invention has reasonable design, clear logic and convenient operation, can realize automatic refrigerant adding of the unit, avoids the prior operations of calculation, weighing, real-time observation and the like, improves the construction efficiency and ensures that the refrigerant adding amount is more accurate. Simultaneously, fill the completion back at automation, can fill the device easily to demolish with automation, avoid producing the influence to follow-up air conditioner normal operating, be favorable to promoting.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention.
Fig. 2 is a schematic view of the connection between the refrigerant filling pipe and the liquid pipe stop valve.
Fig. 3 is a control flow diagram of the present invention.
Wherein, 1-compressor; 2-exhaust check valve; 3-a four-way valve; 4-outdoor heat exchanger; 5-liquid pipe stop valve; 6-electronic expansion valve of indoor machine; 7-indoor heat exchanger; 8-air pipe stop valve; 9-a gas-liquid separator; 10-bypass electromagnetic valve; 11-exhaust gas temperature sensor; 12-an inspiratory temperature sensor; 13-ambient temperature sensor; 14-an exhaust pressure sensor; 15-an inspiratory pressure sensor; 16-refrigerant filling pipe; 17-refrigerant charging one-way valve; 18-nanon seed; 19-a linker.
Detailed Description
The invention is further described below with reference to the drawings and examples.
As shown in fig. 1 and 2, a refrigerant automatic-charging multi-split system includes an outdoor unit and an indoor unit.
The outdoor unit comprises a compressor 1, a four-way valve 3, an outdoor unit heat exchanger 4 and a gas-liquid separator 9. Wherein, four ports of the four-way valve 3 are respectively connected with an exhaust port of the compressor 1, a first end of the outdoor heat exchanger 4, an inlet of the gas-liquid separator 9 and the gas pipe stop valve 8. The air suction port of the compressor 1 is connected with the outlet of the gas-liquid separator 9. And the second end of the outdoor heat exchanger 4 is connected with the liquid pipe stop valve 5. A bypass is arranged between the inlet of the gas-liquid separator 9 and the liquid pipe stop valve 5, and a bypass electromagnetic valve 10 is arranged on the bypass and can control the bypass. An exhaust check valve 2 is further arranged on a pipeline between an exhaust port of the compressor 1 and the four-way valve 3, and exhaust backflow can be avoided.
The indoor unit comprises a plurality of indoor unit heat exchangers 7 connected in parallel. The first end of the indoor heat exchanger 7 is connected to the air pipe stop valve 8, and the second end of the indoor heat exchanger is connected to the liquid pipe stop valve 5 after passing through the indoor electronic expansion valve 6. Therefore, the refrigerant circulation loop in the outdoor unit is communicated with the refrigerant circulation loop in the indoor unit through the air pipe stop valve and the liquid pipe stop valve.
And a refrigerant charging pipe 16. This refrigerant fills one end accessible of pipe 16 and receives son 18 to be connected to on the joint 19 of liquid pipe stop valve 5, the refrigerant jar can be connected to its other end to carry out the refrigerant to the system and annotate, and can fill after filling, convenient demolish, reduce the influence to system normal operating. The nut belongs to one of hardware fittings, is widely used in the fields of air conditioners, refrigeration equipment, mechanical equipment and the like, is suitable for pipeline connection in various air conditioner refrigeration systems, and the chamfer surface after the internal thread is finished is matched with the bell mouth of the screw connection copper pipe. The nano-tubes are generally made of copper materials, and corresponding specifications can be selected to match with corresponding copper tubes. The liquid pipe stop valve of the air conditioner is generally provided with a connector with threads, so that the refrigerant filling pipe can be connected with the liquid pipe stop valve by screwing the connector. And after filling, conveniently demolish refrigerant filling pipe.
Further, a refrigerant filling check valve 17 is arranged on the refrigerant filling pipe 16, and can prevent the refrigerant from flowing back to the refrigerant tank.
And an air suction temperature sensor 12 and an air suction pressure sensor 15 are arranged on a pipeline between the four-way valve 3 and the inlet of the gas-liquid separator 9, and can detect air suction temperature and air suction pressure. An exhaust temperature sensor 11 and an exhaust pressure sensor 14 are arranged on an exhaust port of the compressor 1, and can detect exhaust temperature and exhaust pressure. The outdoor heat exchanger 4 is provided with an ambient temperature sensor 13 for detecting an outdoor ambient temperature. Each temperature sensor and each pressure sensor are electrically connected with the system controller, and can acquire and calculate corresponding temperature and pressure information in real time, thereby creating favorable conditions for realizing automatic control.
A control method for automatically filling a multi-split air conditioning system according to the refrigerant comprises the following steps:
1) Manually closing the liquid pipe stop valve and opening the air pipe stop valve; connecting the filling pipe with a refrigerant tank, opening a valve on the refrigerant tank, and beginning to add the refrigerant;
2) Opening all the electronic expansion valves of the indoor units to 60 steps;
3) Detecting the suction pressure LP through a suction pressure sensor, and detecting the ambient temperature To through an ambient temperature sensor; if LP is larger than LP0, turning to step 4); otherwise, turning to the step 1); wherein LP0 is a set value and is changed according To;
4) Starting the compressor to enable the frequency of the compressor to be 60rps; meanwhile, opening an electronic expansion valve of the indoor unit to 90 steps;
5) Detecting exhaust pressure HP through an exhaust pressure sensor, and detecting ambient temperature To through an ambient temperature sensor; if HP is more than HP0, turning to step 6); otherwise, turning to the step 4); wherein HP0 is a set value and is changed according To;
6) Detecting an exhaust temperature Td by an exhaust temperature sensor; calculating the exhaust superheat degree Td _ sh = Td-Tc; wherein Tc is the saturation temperature corresponding to HP;
7) If Td _ sh is less than or equal to 25 ℃, turning to the step 8); otherwise, turning to the step 4);
8) Detecting a suction pressure LP by a suction pressure sensor; detecting an intake air temperature Ts by an intake air temperature sensor; calculating the suction superheat Ts _ sh = Ts-Te; wherein Te is the saturation temperature corresponding to LP;
9) If Ts _ sh is less than or equal to 5 ℃, turning to the step 10); otherwise, turning to the step 4);
10 ) the compressor is stopped and the electronic expansion valve of the indoor unit is completely closed;
11 Refrigerant filling is completed and the refrigerant filling pipe is removed.
In the step 3), the determination process of LP0 is as follows:
LP0=12Bar when To > 38 ℃;
when the temperature is more than 28 ℃ and To is less than or equal To 38 ℃, LP0=11Bar;
when the temperature is more than 18 ℃ and is less than or equal To 28 ℃, LP0=10Bar;
when the temperature is more than 5 ℃ and is less than or equal To 18 ℃, LP0=9Bar;
LP0=8Bar when To ≦ 5 ℃.
In the step 5), the HP0 is determined as follows:
HP =28Bar when To > 38 ℃;
HP =24Bar when To is more than 28 ℃ and less than or equal To 38 ℃;
HP =22Bar when To is more than 18 ℃ and less than or equal To 28 ℃;
HP =20Bar when To is more than 5 ℃ and less than or equal To 18 ℃;
HP =18Bar when To ≦ 5 ℃.
According to the invention, the liquid pipe stop valve is provided with the refrigerant filling pipe, and then the refrigerant filling pipe is connected with the refrigerant tank, so that the refrigerant is added to the system, and the refrigerant filling pipe can be detached after the addition is finished. Meanwhile, the invention adjusts the opening degree of the electronic expansion valve of the indoor unit by detecting the information of the air suction and exhaust temperature, the air suction and exhaust pressure and the like in the system, realizes the automatic operation of the refrigerant filling, omits the previous programs of calculation, weighing and the like, and improves the construction efficiency and the quality. In addition, at present, in order to realize refrigerant addition, a special pipeline is often required to be arranged in the system outdoor unit, the pipeline cannot be detached, and certain influence is easily caused during system maintenance.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (6)
1. A refrigerant automatic charging multi-split system comprises an outdoor unit and an indoor unit, wherein a refrigerant circulation loop in the outdoor unit is communicated with a refrigerant circulation loop in the indoor unit through an air pipe stop valve and a liquid pipe stop valve; it is characterized in that the device also comprises a refrigerant filling pipe; one end of the refrigerant filling pipe is movably connected with the liquid pipe stop valve, and the other end of the refrigerant filling pipe can be connected with a refrigerant tank so as to fill refrigerant into the system; the outdoor unit comprises a compressor, a four-way valve, an outdoor unit heat exchanger and a gas-liquid separator; four ports of the four-way valve are respectively connected with an exhaust port of the compressor, a first end of an outdoor unit heat exchanger, an inlet of a gas-liquid separator and a gas pipe stop valve; the air suction port of the compressor is connected with the outlet of the gas-liquid separator; the second end of the outdoor unit heat exchanger is connected with the liquid pipe stop valve; a bypass is arranged between the inlet of the gas-liquid separator and the liquid pipe stop valve; a bypass electromagnetic valve is arranged on the bypass; the indoor unit comprises a plurality of indoor unit heat exchangers connected in parallel; the first end of the heat exchanger of the indoor unit is connected to the air pipe stop valve, and the second end of the heat exchanger of the indoor unit is connected to the liquid pipe stop valve after passing through an indoor electronic expansion valve;
the control method of the refrigerant automatic filling multi-split air-conditioning system comprises the following steps:
1) Manually closing the liquid pipe stop valve and opening the air pipe stop valve; connecting the filling pipe with a refrigerant tank, opening a valve on the refrigerant tank, and beginning to add the refrigerant;
2) Opening all the electronic expansion valves of the indoor units to 60 steps;
3) Detecting the suction pressure LP through a suction pressure sensor, and detecting the ambient temperature To through an ambient temperature sensor; if LP is larger than LP0, turning to step 4); otherwise, turning to the step 1); wherein LP0 is a set value and is changed according To;
4) Starting the compressor to enable the rotating speed of the compressor to be 60rps; meanwhile, opening an electronic expansion valve of the indoor unit to 90 steps;
5) Detecting exhaust pressure HP through an exhaust pressure sensor, and detecting ambient temperature To through an ambient temperature sensor; if HP is more than HP0, turning to step 6); otherwise, turning to the step 4); wherein HP0 is a set value and is changed according To;
6) Detecting an exhaust temperature Td by an exhaust temperature sensor; calculating the exhaust superheat degree Td _ sh = Td-Tc; wherein Tc is the saturation temperature corresponding to HP;
7) If Td _ sh is less than or equal to 25 ℃, turning to the step 8); otherwise, turning to the step 4);
8) The suction pressure LP is detected by a suction pressure sensor, and the suction temperature Ts is detected by a suction temperature sensor (12); calculating the suction superheat Ts _ sh = Ts-Te; wherein Te is the saturation temperature corresponding to LP;
9) If Ts _ sh is less than or equal to 5 ℃, turning to the step 10); otherwise, turning to the step 4);
10 The compressor is stopped and the electronic expansion valve of the indoor unit is completely closed;
11 Refrigerant filling is completed and the refrigerant filling pipe is removed.
2. The refrigerant automatic filling multi-split air conditioner system as claimed in claim 1, wherein the refrigerant filling pipe is provided with a refrigerant filling check valve capable of preventing refrigerant from flowing back to the refrigerant tank.
3. The refrigerant automatic charging multi-split system as claimed in claim 1, wherein the refrigerant charging pipe is connected to the liquid pipe stop valve through a nano-tube.
4. The refrigerant automatic charging multi-split air conditioner system according to claim 1, wherein a suction temperature sensor and a suction pressure sensor are provided on a pipeline between the four-way valve and an inlet of the gas-liquid separator; an exhaust temperature sensor and an exhaust pressure sensor are arranged on an exhaust port of the compressor; and an environment temperature sensor is arranged on the outdoor heat exchanger.
5. The refrigerant automatic filling multi-split system as claimed in claim 1, wherein in the step 3), the determination of LP0 is as follows:
LP0=12Bar when To > 38 ℃;
when the temperature is more than 28 ℃ and is less than or equal To 38 ℃, LP0=11Bar;
when the temperature is more than 18 ℃ and is less than or equal To 28 ℃, LP0=10Bar;
when the temperature is more than 5 ℃ and To is less than or equal To 18 ℃, LP0=9Bar;
LP0=8Bar when To ≦ 5 ℃.
6. The refrigerant automatic charging multi-split system as claimed in claim 1, wherein in the step 5), the HP0 is determined as follows:
HP =28Bar when To > 38 ℃;
HP =24Bar when To is more than 28 ℃ and less than or equal To 38 ℃;
HP =22Bar when To is more than 18 ℃ and less than or equal To 28 ℃;
HP =20Bar when To is more than 5 ℃ and less than or equal To 18 ℃;
HP =18Bar when To ≦ 5 ℃.
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| CN114017891A (en) * | 2021-11-11 | 2022-02-08 | 青岛海信日立空调系统有限公司 | Air conditioner |
| WO2023083040A1 (en) * | 2021-11-11 | 2023-05-19 | 青岛海信日立空调系统有限公司 | Air conditioner |
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| US4683724A (en) * | 1985-10-28 | 1987-08-04 | V. M. International, Inc. | Refrigeration moisture eliminating device and method |
| US6609385B1 (en) * | 2002-10-24 | 2003-08-26 | E.F. Products, Inc. | Refrigerant charging/pressure testing hose assembly |
| DE102014011611B4 (en) * | 2014-08-01 | 2018-12-20 | Dürr Somac GmbH | Device for filling air conditioning systems (MAC) with a refrigerant in the vehicle final assembly |
| CN112797680A (en) * | 2020-12-31 | 2021-05-14 | 珠海格力电器股份有限公司 | Control device, method and system for automatically filling refrigerant and air conditioning equipment |
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