CN107763889B - Multi-split air conditioning system and control method thereof - Google Patents
Multi-split air conditioning system and control method thereof Download PDFInfo
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- CN107763889B CN107763889B CN201711163343.XA CN201711163343A CN107763889B CN 107763889 B CN107763889 B CN 107763889B CN 201711163343 A CN201711163343 A CN 201711163343A CN 107763889 B CN107763889 B CN 107763889B
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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
- F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2501—Bypass valves
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- Air Conditioning Control Device (AREA)
Abstract
The invention provides a multi-split air conditioning system and a control method thereof, and relates to the technical field of multi-split air conditioners. In the multi-split air conditioning system, two ends of a compressor are respectively connected to an A port and a C port of a four-way reversing valve. One end of the bypass valve is connected to a pipeline between the oil separator and the four-way reversing valve, and the other end of the bypass valve is connected to a pipeline between the gas separator and the four-way reversing valve. One end of the outdoor heat exchanger is connected to the port B of the four-way reversing valve, and the other end of the outdoor heat exchanger is connected to the port D of the four-way reversing valve through the outdoor electronic expansion valve and the indoor unit in sequence. The indoor unit comprises a plurality of indoor heat exchangers connected in parallel, and each indoor heat exchanger is connected with an indoor electronic expansion valve. After the indoor heat exchanger is shut down from a heating mode, the bypass valve is opened, so that the system pressure can be balanced, and the noise is weakened; by adjusting the opening of the indoor electronic expansion valve, abnormal noise after the indoor heat exchanger is stopped in heating can be further avoided.
Description
Technical Field
The invention relates to the technical field of multi-split air conditioners, in particular to a multi-split air conditioner system and a control method thereof.
Background
At present, the throttle control of indoor units in a frequency conversion multi-split air conditioning system is realized by electronic expansion valves. Generally, after the indoor unit is shut down from a heating mode to various incapability requirements such as warm shutdown, protection shutdown, shutdown and the like, an electronic expansion valve of the indoor unit maintains a certain small opening degree so as to adjust the refrigerant balance of the whole system operation.
However, in this method, since refrigerant flows through the indoor unit, the indoor unit is likely to generate abnormal noise under the influence of the system pressure difference, the state of the flowing refrigerant, and the opening of the electronic expansion valve, and particularly, the noise is large during the load conversion process, which affects the comfort experience of the user.
Therefore, it is an urgent technical problem to design a multi-split air conditioning system and a control method thereof, which can prevent or reduce the noise generated by the indoor unit from the heating mode to the warm shutdown.
Disclosure of Invention
In view of the above, the present invention is directed to a multi-split air conditioning system and a control method thereof, so as to prevent or reduce noise generated by an indoor unit from a heating mode to a shutdown state.
In order to achieve the above object, a first technical solution of the present invention is realized as follows:
a multi-split air conditioning system comprises a compressor, an oil separator, a gas separator, an outdoor heat exchanger, an outdoor electronic expansion valve, an indoor unit, a four-way reversing valve and a bypass valve;
one end of the compressor is connected to the port A of the four-way reversing valve through the oil separator, and the other end of the compressor is connected to the port C of the four-way reversing valve through the gas separator;
one end of the bypass valve is connected to a pipeline between the oil separator and the four-way reversing valve, and the other end of the bypass valve is connected to a pipeline between the gas separator and the four-way reversing valve;
one end of the outdoor heat exchanger is connected to a port B of the four-way reversing valve, and the other end of the outdoor heat exchanger is connected to a port D of the four-way reversing valve through the outdoor electronic expansion valve and the indoor unit in sequence;
the indoor unit comprises a plurality of indoor heat exchangers connected in parallel, and each indoor heat exchanger is connected with an indoor electronic expansion valve.
Furthermore, the multi-split air conditioning system further comprises a first stop valve and a second stop valve, wherein the first stop valve is arranged on a pipeline between the outdoor electronic expansion valve and the indoor unit, and the second stop valve is arranged on a pipeline between the indoor unit and the four-way reversing valve.
Furthermore, the multi-split air conditioning system further comprises a high-pressure switch and a low-pressure switch, the high-pressure switch is arranged on a pipeline between the compressor and the oil separator, and the low-pressure switch is arranged on a pipeline between the compressor and the air separator.
Furthermore, the multi-split air conditioning system further comprises a one-way valve, the one-way valve is arranged on a pipeline between the oil separator and the four-way reversing valve, and the one-way valve allows fluid to flow from the oil separator to the four-way reversing valve.
In order to achieve the above object, a second technical solution of the present invention is realized as follows:
a control method of a multi-split air conditioning system, which is used for controlling the multi-split air conditioning system according to the first technical aspect after an indoor heat exchanger enters a shutdown state from a heating mode, includes:
controlling the indoor electronic expansion valve connected with the indoor heat exchanger after the indoor electronic expansion valve enters the shutdown from the heating mode to be closed;
opening the bypass valve;
judging the running state of a system refrigerant;
if the refrigerant exceeds the overload capacity, controlling the closed indoor electronic expansion valve to be closed continuously;
and if the refrigerant is less than the preset amount, the opening degree of the indoor electronic expansion valve is increased and does not exceed the maximum allowable amount EXvb.
Further, said opening said bypass valve comprises: the bypass valve is opened and maintained for a first preset period of time t 1.
Further, the determining the operating state of the system refrigerant includes:
detecting a high pressure value Pc, a low pressure value Ps, a suction temperature Ti and an opening EXV of the outdoor electronic expansion valve of the system;
converting the high pressure value Pc into a first saturation temperature Tc, and converting the low pressure value Ps into a second saturation temperature Ts;
calculating an intake air superheat Tsh which is equal to a difference between the second saturation temperature Ts and the intake air temperature Ti;
if the opening EXV of the outdoor electronic expansion valve is smaller than or equal to the minimum preset opening and the suction superheat Tsh is smaller than or equal to a first preset superheat delta T1, judging that the refrigerant exceeds the overload amount;
and if the opening EXV of the outdoor electronic expansion valve is larger than the maximum preset opening and the suction superheat Tsh is larger than a second preset superheat delta T2, judging that the refrigerant is less than the preset amount.
Further, the determining the operating state of the system refrigerant includes:
detecting a high pressure value Pc, a low pressure value Ps, a suction temperature Ti and an opening EXV of the outdoor electronic expansion valve of the system;
converting the high pressure value Pc into a first saturation temperature Tc, and converting the low pressure value Ps into a second saturation temperature Ts;
calculating an intake air superheat Tsh which is equal to a difference between the second saturation temperature Ts and the intake air temperature Ti;
if the first saturation temperature Tc is greater than or equal to the preset temperature, judging that the refrigerant exceeds the overload amount;
and if the opening EXV of the outdoor electronic expansion valve is larger than the maximum preset opening and the suction superheat Tsh is larger than a second preset superheat delta T2, judging that the refrigerant is less than the preset amount.
Further, between opening the bypass valve and judging the state of system refrigerant operation, the method further includes:
and the outdoor heat exchanger is continuously operated for a second preset time period t 2.
Further, the increasing the opening degree of the indoor electronic expansion valve includes:
adjusting the opening degree of most or all of the closed indoor electronic expansion valves, and/or adjusting the opening degree of most or all of the unclosed indoor electronic expansion valves.
Compared with the prior art, the multi-split air conditioning system and the control method thereof have the following advantages:
1. according to the multi-split air conditioning system and the control method thereof, after the indoor heat exchanger is shut down from a heating mode, the shut down is any one of the shut down load conversion states such as warm shut down, protection shut down and shut down, and by opening the bypass valve, the system pressure can be balanced and the noise can be weakened.
2. If the refrigerant exceeds the overload capacity, controlling the closed indoor electronic expansion valve to be closed continuously, and reducing the refrigerant; if the refrigerant is less than the preset amount, the opening degree of the indoor electronic expansion valve is increased, the refrigerant can be increased, the balance of the operation of the refrigerant of the whole system is kept, abnormal noise generated after the heating stop of the indoor heat exchanger can be effectively avoided, and the comfort experience of a user is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural view of a multi-split air conditioning system according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a control method of a multi-split air conditioning system according to an embodiment of the present invention;
FIG. 3 is a first flowchart illustrating a method for determining the operation status of a system refrigerant;
fig. 4 is a second flowchart for determining the operation state of the system refrigerant.
Icon: 100-a multi-split air conditioning system; 1-a compressor; 2-an oil separator; 3-a bypass valve; 4-a gas separator; a 5-four-way reversing valve; 6-outdoor heat exchanger; 7-outdoor electronic expansion valve; 8-a first stop valve; 9-indoor electronic expansion valve; 10-indoor heat exchanger; 11-a second stop valve; 12-a high voltage switch; 13-a low voltage switch; 14-one-way valve.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, the embodiment provides a multi-split air conditioning system 100, and the multi-split air conditioning system 100 includes a compressor 1, an oil separator 2, a gas separator 4, an outdoor heat exchanger 6, an outdoor electronic expansion valve 7, an indoor unit, a four-way reversing valve 5, a bypass valve 3, a first stop valve 8, a second stop valve 11, a high-pressure switch 12, a low-pressure switch 13, and a check valve 14.
One end of the compressor 1 is connected to the port A of the four-way reversing valve 5 through the oil separator 2, and the other end of the compressor 1 is connected to the port C of the four-way reversing valve 5 through the gas separator 4.
One end of the bypass valve 3 is connected to a pipeline between the oil separator 2 and the four-way reversing valve 5, and the other end of the bypass valve 3 is connected to a pipeline between the gas separator 4 and the four-way reversing valve 5.
One end of the outdoor heat exchanger 6 is connected to the port B of the four-way reversing valve 5, and the other end of the outdoor unit is connected to the port D of the four-way reversing valve 5 through the outdoor electronic expansion valve 7 and the indoor unit in sequence.
The indoor unit comprises a plurality of indoor heat exchangers 10 connected in parallel, and each indoor heat exchanger 10 is connected with an indoor electronic expansion valve 9. In this embodiment, the number of the indoor heat exchangers 10 is four.
The first stop valve 8 is arranged on a pipeline between the outdoor electronic expansion valve 7 and the indoor unit, and the second stop valve 11 is arranged on a pipeline between the indoor unit and the four-way reversing valve 5.
The high-pressure switch 12 is provided on a pipeline between the compressor 1 and the oil separator 2, and the low-pressure switch 13 is provided on a pipeline between the compressor 1 and the gas separator 4.
A check valve 14 is provided on the line between the oil separator 2 and the four-way selector valve 5, the check valve 14 allowing fluid to flow from the oil separator 2 to the four-way selector valve 5.
Cooling mode of the multi-split air conditioning system 100: the port A of the four-way reversing valve 5 is communicated with the port B, and the port C is communicated with the port D. The secondary refrigerant output by the compressor 1 passes through the oil separator 2, then flows to the outdoor heat exchanger 6 through the four-way reversing valve 5 to release heat, then passes through the indoor unit to absorb heat, and then sequentially passes through the four-way reversing valve 5 and the gas separator 4 to flow back to the compressor 1.
Heating mode of the multi-split air conditioning system 100: the port A of the four-way reversing valve 5 is communicated with the port D, and the port B is communicated with the port C. The secondary refrigerant output by the compressor 1 passes through the oil separator 2, then flows to the indoor unit through the four-way reversing valve 5 to release heat, then passes through the outdoor heat exchanger 6 to absorb heat, and then sequentially passes through the four-way reversing valve 5 and the gas separator 4 to flow back to the compressor 1.
The embodiment also provides a control method of the multi-split air conditioning system 100, which is used for keeping the balance of the refrigerant operation of the whole system after the indoor heat exchanger 10 is shut down from the heating mode, effectively avoiding abnormal noise after the indoor heat exchanger 10 is heated and shut down, and improving the comfort experience of a user, wherein the shut down is any one of the shut down load conversion states such as warm shut down, protection shut down, shutdown and the like.
The method comprises the following steps:
s1: the closing of the indoor electronic expansion valve 9 connected to the indoor heat exchanger 10 after the shutdown from the heating mode is controlled.
S2: the bypass valve 3 is opened.
Referring to fig. 1, after the bypass valve 3 is opened, the coolant output by the compressor 1 passes through the oil separator 2, and then the coolant flows directly to the bypass valve 3, then to the gas separator 4, and then flows back to the compressor 1 under the action of pressure, thereby exerting the effect of balancing pressure on the system.
Specifically, the bypass valve 3 is opened and maintained for a first preset time period t1, and after the outdoor heat exchanger 6 is continuously operated for a second preset time period t2, the process proceeds to S3. The first preset time period t1 and the second preset time period t2 can be flexibly set according to actual working conditions.
S3: and judging the running state of the system refrigerant.
The first mode of judging the running state of the system refrigerant comprises two modes:
s31: the high pressure value Pc, the low pressure value Ps, the suction temperature Ti of the system and the opening EXV of the outdoor electronic expansion valve 7 are detected.
S32: the high pressure value Pc is converted into a first saturation temperature Tc, and the low pressure value Ps is converted into a second saturation temperature Ts.
S33: and calculating the suction superheat Tsh which is equal to the difference between the second saturation temperature Ts and the suction temperature Ti.
S341: if the opening EXV of the outdoor electronic expansion valve 7 is less than or equal to the minimum preset opening and the suction superheat Tsh is less than or equal to the first preset superheat Δ T1, it is determined that the refrigerant exceeds the overload amount.
S35: if the opening EXV of the outdoor electronic expansion valve 7 is greater than the maximum preset opening and the suction superheat Tsh is greater than the second preset superheat Δ T2, it is determined that the refrigerant is less than the preset amount.
In other embodiments, the sequence of the steps for determining the system refrigerant operation state may be adjusted, for example, S31 and S32 may be combined into one step, or S32 and S33 may be combined into one step. The sequence of S341 and S35 is not limited, and may be performed simultaneously.
The second way of judging the running state of the system refrigerant is as follows:
s31: the high pressure value Pc, the low pressure value Ps, the suction temperature Ti of the system and the opening EXV of the outdoor electronic expansion valve 7 are detected.
S32: the high pressure value Pc is converted into a first saturation temperature Tc, and the low pressure value Ps is converted into a second saturation temperature Ts.
S33: and calculating the suction superheat Tsh which is equal to the difference between the second saturation temperature Ts and the suction temperature Ti.
S342: and if the first saturation temperature Tc is greater than or equal to the preset temperature, judging that the refrigerant exceeds the overload amount.
S35: if the opening EXV of the outdoor electronic expansion valve 7 is greater than the maximum preset opening and the suction superheat Tsh is greater than the second preset superheat Δ T2, it is determined that the refrigerant is less than the preset amount.
In other embodiments, the sequence of the steps for determining the system refrigerant operation state may be adjusted, for example, S31 and S32 may be combined into one step, or S32 and S33 may be combined into one step. The sequence of S342 and S35 is not limited, and may be performed simultaneously. The sequence of S342 and S33 is not limited, and may be performed simultaneously.
S4: and if the refrigerant exceeds the overload amount, controlling the closed indoor electronic expansion valve 9 to be continuously closed.
On the premise that the bypass valve 3 balances the system pressure, the closed indoor electronic expansion valve 9 is continuously closed to prevent the refrigerant inside the indoor electronic expansion valve from flowing, the corresponding indoor heat exchanger 10 does not work, and the noise can be reduced.
S5: if the refrigerant is less than the preset amount, the opening degree of the indoor electronic expansion valve 9 is increased and does not exceed the maximum allowable amount EXVb.
Specifically, the opening degrees of most or all of the closed indoor electronic expansion valves 9 may be adjusted, or the opening degrees of most or all of the unopened indoor electronic expansion valves 9 may be adjusted. In short, the opening of the indoor electronic expansion valve 9 is adjusted to be larger, so that the refrigerant is in a liquid state as much as possible, and a gas-liquid mixed state is avoided, thereby reducing noise.
Further, S1 and S2 may be combined into one step. The sequence of S4 and S5 is not limited, and may be performed simultaneously.
The multi-split air conditioning system 100 and the control method thereof provided by the embodiment have the following advantages:
1. according to the multi-split air conditioning system 100 and the control method thereof, after the indoor heat exchanger 10 is shut down from a heating mode, the bypass valve 3 is opened, so that the system pressure can be balanced, and the noise can be reduced.
2. If the refrigerant exceeds the overload amount, controlling the closed indoor electronic expansion valve 9 to be closed continuously, so that the refrigerant can be reduced; if the amount of the refrigerant is less than the preset amount, the opening degree of the indoor electronic expansion valve 9 is increased, the refrigerant can be increased, so that the balance of the operation of the refrigerant of the whole system is kept, the abnormal noise generated after the heating stop of the indoor heat exchanger 10 can be effectively avoided, and the comfort experience of a user is improved.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The control method of the multi-split air conditioning system (100) is characterized in that the method is used for controlling the multi-split air conditioning system (100), and the multi-split air conditioning system (100) comprises a compressor (1), an oil separator (2), a gas separator (4), an outdoor heat exchanger (6), an outdoor electronic expansion valve (7), an indoor unit, a four-way reversing valve (5) and a bypass valve (3);
one end of the compressor (1) is connected to an A port of the four-way reversing valve (5) through the oil separator (2), and the other end of the compressor (1) is connected to a C port of the four-way reversing valve (5) through the gas separator (4);
one end of the bypass valve (3) is connected to a pipeline between the oil separator (2) and the four-way reversing valve (5), and the other end of the bypass valve (3) is connected to a pipeline between the gas separator (4) and the four-way reversing valve (5);
one end of the outdoor heat exchanger (6) is connected to a port B of the four-way reversing valve (5), and the other end of the outdoor heat exchanger (6) is connected to a port D of the four-way reversing valve (5) through the outdoor electronic expansion valve (7) and the indoor unit in sequence;
the indoor unit comprises a plurality of indoor heat exchangers (10) connected in parallel, and each indoor heat exchanger (10) is connected with an indoor electronic expansion valve (9);
the method is used after the indoor heat exchanger (10) enters shutdown from a heating mode, and comprises the following steps:
controlling the indoor electronic expansion valve (9) connected with the indoor heat exchanger (10) after the shutdown from the heating mode to be closed;
opening the bypass valve (3);
judging the running state of a system refrigerant;
if the refrigerant exceeds the overload capacity, controlling the closed indoor electronic expansion valve (9) to be closed continuously;
and if the refrigerant is less than the preset amount, the opening degree of the indoor electronic expansion valve (9) is increased and does not exceed the maximum allowable amount EXvb.
2. Method according to claim 1, characterized in that said opening of said bypass valve (3) comprises: opening the bypass valve (3) and maintaining for a first preset time period t 1.
3. The method of claim 2, wherein the determining the state of the system refrigerant operation comprises:
detecting a high pressure value Pc, a low pressure value Ps, a suction temperature Ti and an opening EXV of the outdoor electronic expansion valve (7) of the system;
converting the high pressure value Pc into a first saturation temperature Tc, and converting the low pressure value Ps into a second saturation temperature Ts;
calculating an intake air superheat Tsh which is equal to a difference between the second saturation temperature Ts and the intake air temperature Ti;
if the opening EXV of the outdoor electronic expansion valve (7) is smaller than or equal to the minimum preset opening and the suction superheat Tsh is smaller than or equal to a first preset superheat delta T1, judging that the refrigerant exceeds the overload amount;
and if the opening EXV of the outdoor electronic expansion valve (7) is larger than the maximum preset opening and the suction superheat Tsh is larger than a second preset superheat delta T2, judging that the refrigerant is less than the preset amount.
4. The method of claim 2, wherein the determining the state of the system refrigerant operation comprises:
detecting a high pressure value Pc, a low pressure value Ps, a suction temperature Ti and an opening EXV of the outdoor electronic expansion valve (7) of the system;
converting the high pressure value Pc into a first saturation temperature Tc, and converting the low pressure value Ps into a second saturation temperature Ts;
calculating an intake air superheat Tsh which is equal to a difference between the second saturation temperature Ts and the intake air temperature Ti;
if the first saturation temperature Tc is greater than or equal to the preset temperature, judging that the refrigerant exceeds the overload amount;
and if the opening EXV of the outdoor electronic expansion valve (7) is larger than the maximum preset opening and the suction superheat Tsh is larger than a second preset superheat delta T2, judging that the refrigerant is less than the preset amount.
5. The method of claim 2, wherein between said opening of said bypass valve (3) and said determining a state of system coolant operation, further comprises:
and the outdoor heat exchanger (6) continuously operates for a second preset time period t 2.
6. The method according to claim 1, wherein said increasing the opening degree of the indoor electronic expansion valve (9) comprises:
adjusting the opening degree of most or all of the closed indoor electronic expansion valves (9), and/or adjusting the opening degree of most or all of the unclosed indoor electronic expansion valves (9).
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| CN114992800B (en) * | 2022-05-07 | 2024-02-23 | 青岛海尔空调电子有限公司 | Self-cleaning control method for shutdown stage of air conditioning system and air conditioning system |
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| CN102734865A (en) * | 2011-04-12 | 2012-10-17 | 珠海格力电器股份有限公司 | Multi-split air conditioning system and control method thereof |
| CN103791588A (en) * | 2014-01-21 | 2014-05-14 | 宁波奥克斯电气有限公司 | Control method for solving problem of shortage of refrigerants of multi-link air conditioning unit |
| CN105299836A (en) * | 2015-11-09 | 2016-02-03 | 南京天加空调设备有限公司 | Control method for multi-split air conditioning system |
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