CN111076279A - Control method for updating multi-split air conditioning system and multi-split air conditioning system updating method - Google Patents
Control method for updating multi-split air conditioning system and multi-split air conditioning system updating method Download PDFInfo
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- CN111076279A CN111076279A CN202010018929.2A CN202010018929A CN111076279A CN 111076279 A CN111076279 A CN 111076279A CN 202010018929 A CN202010018929 A CN 202010018929A CN 111076279 A CN111076279 A CN 111076279A
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- indoor unit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/26—Refrigerant piping
- F24F1/32—Refrigerant piping for connecting the separate outdoor units to indoor units
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
- F24F11/88—Electrical aspects, e.g. circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a control method for updating a multi-split air conditioning system and the multi-split air conditioning system updated by using the method. The control method comprises the following steps: detecting the pressure value of the refrigerant entering the indoor unit; and controlling the opening degree of the electronic expansion valve on the bypass pipeline according to the detected pressure value, thereby coordinately controlling the pressure value of the refrigerant flowing into the indoor pipeline when the outdoor unit operates. The invention can effectively prevent the damage of the high-pressure refrigerant of the external machine to the pipeline of the internal machine caused by the inconsistent pipeline design pressure due to different refrigerants after the external machine is replaced by the system.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method for updating a multi-split air conditioning system and the multi-split air conditioning system using the same.
Background
Many older air conditioning systems use refrigerant R22, which is an urgent replacement for refrigerant R410A due to environmental and safety requirements. In addition, the outdoor unit is in a bad working state, some service lives of the outdoor unit are expired, the indoor unit is in a good state, and only the outdoor unit can be replaced so as not to damage indoor decoration. Because the design pressure of the R22 refrigerant system pipeline is 3.3MPa, and the design pressure of the R410A refrigerant system pipeline is 4.3MPa, when the outer machine of the original R22 refrigerant unit is replaced by the outer machine of R410A, the pressure of the refrigerant flowing into the inner machine from the outer machine cannot be higher than the pressure value designed by the original system. For example, in the maximum heating condition, even if the frequency of the compressor of the unit is reduced to the minimum, the pressure of the refrigerant entering the internal unit can still be more than 3.3 MPa. Therefore, a new control method is required for updating the air conditioning system of the external unit to ensure that the pressure of the refrigerant entering the internal unit is below a design value which meets the pressure of the pipeline of the internal unit.
Disclosure of Invention
The invention provides a control method for updating a multi-split air conditioning system and the multi-split air conditioning system updated by using the control method, and aims to solve the problem of pressure matching between an outer unit and an inner unit after the outer unit is replaced.
The technical scheme adopted by the invention is that a control method for a new multi-split air conditioning system is provided, and the control method comprises the following steps:
detecting the pressure value of the refrigerant entering the indoor unit;
and controlling the opening degree of the electronic expansion valve on the bypass pipeline according to the detected pressure value, thereby controlling the pressure of the refrigerant entering the indoor unit.
In one embodiment, the control method includes the following steps:
when the pressure value of the refrigerant entering the indoor unit is less than AXMPa, closing the electronic expansion valve on the bypass pipeline;
when the pressure value of the refrigerant entering the indoor unit is greater than AXMPa and less than XMPa, the pressure value of the refrigerant entering the indoor unit is stabilized below XMPa by controlling the opening degree of the electronic expansion valve on the bypass;
when the pressure value of the refrigerant entering the indoor unit is greater than XMPa, the electronic expansion valve on the bypass is fully opened, and the compressor is stopped for protection;
a is a coefficient, and X is a limiting value of the pressure of the indoor unit pipeline system.
Controlling the pressure value of the refrigerant entering the indoor unit by controlling the opening degree of a first electronic expansion valve on a first bypass pipeline under the refrigeration working condition; and in the heating condition, the pressure value of the refrigerant entering the indoor unit is controlled by controlling the opening degree of a second electronic expansion valve on a second bypass pipeline.
And detecting the pressure value of the refrigerant entering the indoor unit every 3 seconds after the compressor is stopped, closing the electronic expansion valve on the bypass pipeline when the pressure value is less than or equal to BXMPa, starting the compressor, and normally starting the system. Wherein B is a coefficient.
The invention also provides an updated multi-split air conditioning system, which comprises an indoor unit and an outdoor unit, wherein the outdoor unit is communicated with the indoor unit through an inlet and outlet pipeline, a first bypass communicated with a compressor suction pipeline is respectively led out from a throttling device in the outdoor unit on a pipeline on one side of a refrigeration working condition outlet, and a first electronic expansion valve is arranged on the first bypass; and a second bypass communicated with the outlet pipeline of the indoor unit, and provided with a second electronic expansion valve.
And pressure sensors are respectively arranged on inlet and outlet pipelines connected with the outdoor unit and the indoor unit.
The updated multi-split air conditioning system realizes the pressure matching of the indoor unit and the outdoor unit by using the control method.
The invention has the following beneficial effects:
the technical scheme provided by the invention well solves the problem that the pipelines of the indoor unit are damaged by high-pressure refrigerant due to different design pressures of the pipelines of the indoor unit and the outdoor unit caused by different refrigerants after the outdoor unit is replaced.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
fig. 2 is a flow chart of the control method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and examples. It should be understood that the following specific examples are only for illustrating the present invention and are not to be construed as limiting the present invention.
In order to solve the problem of mismatching of pipeline pressure caused by replacement of a refrigerant and/or an outdoor unit, the invention provides a solution, wherein a pressure sensor is arranged on a pipeline for the refrigerant to enter an indoor unit and used for detecting the pressure value of the refrigerant entering the indoor unit under an operation mode (cooling/heating) of the outdoor unit; according to the range of the detected pressure value, the opening degree of the electronic expansion valve on the bypass pipeline is controlled, and the bypass refrigerant quantity is controlled, so that the pressure of the refrigerant entering the indoor unit is controlled, and the purpose of protecting the system pipeline of the indoor unit is achieved.
As shown in fig. 1, the multi-split air conditioning system includes an indoor unit and an outdoor unit, which are communicated with each other through an inlet/outlet duct and a control valve. The outdoor unit comprises a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a throttling device 4, a subcooler 5 and a vapor-liquid separator 6.
In the technical scheme provided by the invention, a first bypass 7 communicated with a suction pipeline of a compressor is respectively led out from an outdoor unit on a pipeline at one side of a refrigerating working condition outlet of a throttling device, and a first electronic expansion valve 8 is arranged on the first bypass; a second bypass 9 communicated with an outlet pipeline of the indoor unit is led out from an outlet pipeline of the subcooler, and a second electronic expansion valve 10 is arranged on the second bypass. Pressure sensors P1 and P2 are respectively arranged on the inlet and outlet pipelines of the indoor unit.
As shown in fig. 2, the control method proposed by the present invention includes:
when the air conditioner is operated, detecting the pressure value of the refrigerant entering the indoor unit pipeline through a pressure sensor arranged on the indoor unit inlet and outlet pipeline;
when the pressure value of the refrigerant entering the indoor unit is less than a multiple of the limiting value X of the indoor unit, for example 0.9 time (0.9 XMPa), closing the electronic expansion valve on the bypass pipeline;
when the pressure value of the refrigerant entering the indoor unit is greater than 0.9XMPa and less than XMPa, the pressure value of the refrigerant entering the indoor unit is stabilized below XMPa by controlling the opening degree of the electronic expansion valve on the bypass;
when the pressure value of the refrigerant entering the indoor unit is greater than XMPa, the electronic expansion valve on the bypass is fully opened, and the compressor is stopped for protection.
Under the refrigeration mode, the flow of the refrigerant in the first bypass pipeline is controlled by controlling the opening degree of the first electronic expansion valve, so that the purpose of controlling the pressure of the refrigerant in the indoor unit pipeline is achieved.
In the heating mode, the flow of the refrigerant in the second bypass pipeline is controlled by controlling the opening degree of the second electronic expansion valve, so that the aim of controlling the pressure of the refrigerant in the indoor unit pipeline is fulfilled.
The design pressure of an inner machine pipeline system is limited to XMPa, the design pressure of an outer machine pipeline system is YMPa, and Y is larger than X.
When the air conditioning system is in cooling operation, the second electronic expansion valve 10 is closed and not operated, the pressure sensor P1 detects the pressure of the liquid refrigerant entering the indoor unit, and the first electronic expansion valve is controlled according to the range of the detected pressure value.
1. When the detected pressure value P is less than or equal to 0.9XMPa, the first electronic expansion valve 1 on the first bypass pipeline is closed;
2. when the detected pressure value is greater than 0.9XMPa and less than XMPa, XMPa is greater than P and greater than 0.9XMPa, the first electronic expansion valve on the first bypass pipeline sets different opening degrees according to the pressure value, and the pressure of the liquid refrigerant entering the indoor unit is stabilized below XMPa;
3. and when the detected pressure value P is larger than XMPa, fully opening the first electronic expansion valve on the first bypass pipeline, and stopping the compressor for protection.
Detecting a pressure sensor P1 every 3min after the compressor is stopped,
(1) when the pressure value X is smaller than or equal to a multiple B of the limit value, for example, P is smaller than or equal to 0.8XMPa, the first electromagnetic valve on the first bypass pipeline is closed, the compressor is started, and the system is normally started;
(2) when the pressure value P is more than 0.8XMPa, the detection is continued after every 3min until the pressure value P is less than or equal to 0.8 XMPa.
When the air conditioning system is operated for heating, the first electronic expansion valve 8 is closed and does not act. The pressure sensor P2 detects the pressure of the refrigerant entering the indoor unit pipe, and controls the second electronic expansion valve according to the range in which the detected pressure value is located.
1. When the detected pressure value P is less than or equal to 0.9XMPa, closing a second electronic expansion valve on the second bypass pipeline;
2. when the detected pressure value is greater than 0.9XMPa and less than XMPa, XMPa is greater than P and greater than 0.9XMPa, the second electronic expansion valve on the second bypass pipeline sets different opening degrees according to the pressure value, and the pressure of the refrigerant entering the indoor unit is stabilized below XMPa;
3. and when the detected pressure value P is larger than XMPa, fully opening a second electronic expansion valve on the second bypass pipeline, and stopping the compressor for protection. After every 3min, the pressure sensor P2 is detected, and the following operations are carried out according to the magnitude of the pressure value:
(1) when the pressure value P is less than or equal to 0.8XMPa, closing a second electronic expansion valve on a second bypass pipeline, starting the compressor, and starting the system normally;
(2) when the pressure value P is more than 0.8XMPa, the detection is continued after every 3min until the pressure value P is less than or equal to 0.8 XMPa.
The following description will be given taking refrigerants R22 and R410A as examples. For an air conditioning system with refrigerant R22, the design pressure limit X for the piping is 3.3 MPa. When the outdoor unit replacement refrigerant is R410A, the pipeline design pressure limit Y is 4.3 MPa.
When the system is in refrigerating operation, the second electronic expansion valve is closed and does not act, and the pressure sensor P1 detects the pressure of the refrigerant at the inlet of the liquid pipe: when the detected pressure value P is less than or equal to 3.0MPa (0.9 times of the integer), closing the first electronic expansion valve 8; when the detected pressure value is more than 3.0MPa and less than 3.3MPa, the pressure of the refrigerant liquid pipe flowing into the indoor unit is stabilized below 3.3MPa when the detected pressure value is more than 3.3MPa and more than P is more than 3.3MPa, and the first electronic expansion valve sets different opening degrees according to the pressure value; when the detected pressure value P is larger than 3.3MPa, the first electronic expansion valve is fully opened, and the compressor is stopped for protection. Then detecting the outlet pressure by a pressure sensor P1 every 3min, and starting the compressor when P is less than or equal to 2.6 MPa; when P is more than 2.6MPa, the detection is continued every 3min until the pressure value P is less than or equal to 2.6 MPa.
When the system is operated in heating, the first electronic expansion valve is closed, the pressure sensor P2 detects the pressure of the refrigerant entering the indoor unit, and when the detected pressure value P is less than or equal to 3.0MPa, the second electronic expansion valve 10 is closed; when the detected pressure value is more than 3.0MPa and less than 3.3MPa, the pressure of 3.3MPa is more than P and more than 3.0MPa, the second electronic expansion valve sets different opening degrees according to the pressure value, and the pressure of the refrigerant gas entering the internal machine is stabilized below 3.3 MPa; when the detected pressure value P is larger than 3.3MPa, the second electronic expansion valve is fully opened, and the compressor is stopped for protection. Then detecting the pressure of the refrigerant entering the indoor unit by a pressure sensor P2 every 3min, and normally starting the compressor when the pressure P is less than or equal to 2.6 MPa; when P is more than 2.6MPa, the detection is continued every 3min until P is less than or equal to 2.6 MPa.
The control method provided by the invention can effectively prevent the pipeline of the internal machine from being damaged by the high-pressure refrigerant of the external machine due to inconsistent pipeline design pressure caused by different refrigerants after the external machine is replaced by the system.
The foregoing is considered as illustrative only of the embodiments of the invention. It should be understood that any modifications, equivalents and changes made within the spirit and framework of the inventive concept are intended to be included within the scope of the present invention.
Claims (10)
1. A control method for updating a multi-split air conditioning system is characterized by comprising the following steps:
detecting the pressure value of the refrigerant entering the indoor unit;
and controlling the opening degree of the electronic expansion valve on the bypass pipeline according to the detected pressure value, thereby coordinately controlling the refrigerant pressure of the indoor unit and the outdoor unit.
2. The control method according to claim 1, characterized by comprising the steps of:
when the pressure value of the refrigerant entering the indoor unit is less than AXMPa, closing the electronic expansion valve on the bypass pipeline;
when the pressure value of the refrigerant entering the indoor unit is greater than AXMPa and less than XMPa, the pressure value of the refrigerant entering the indoor unit is stabilized below XMPa by controlling the opening degree of the electronic expansion valve on the bypass pipeline;
when the pressure value of the refrigerant entering the indoor unit is greater than XMPa, the electronic expansion valve on the bypass pipeline is fully opened, and the compressor is stopped for protection;
a is a coefficient, and X is a limiting value of the pressure of the indoor unit pipeline system.
3. The control method according to claim 2, wherein the a value is a coefficient smaller than 1.
4. The control method as claimed in claim 2, wherein the pressure value of the refrigerant entering the indoor unit is controlled by controlling the opening degree of the first electronic expansion valve on the first bypass line in the cooling condition; and in the heating condition, the pressure value of the refrigerant entering the indoor unit is controlled by controlling the opening degree of a second electronic expansion valve on a second bypass pipeline.
5. The control method as claimed in claim 2, wherein a pressure value of the refrigerant entering the indoor unit is detected every 3 seconds after the compressor is stopped, and when the pressure value is less than or equal to BXMPa, the electronic expansion valve on the bypass line is closed, the compressor is started, and the system is normally started.
6. The control method according to claim 5, wherein the B value is a coefficient smaller than the coefficient A.
7. A kind of renewal multi-online air conditioning system, including indoor set and outdoor unit, the outdoor unit communicates with indoor set through the business turn over pipeline, characterized by that, the said outdoor unit draws a first bypass communicated with compressor suction pipe separately on the pipeline of one side of outlet of refrigeration working condition of the throttling set, there is a first electronic expansion valve on it; and a second bypass communicated with the outlet pipeline of the indoor unit, and provided with a second electronic expansion valve.
8. The multi-split air conditioning system as claimed in claim 7, wherein pressure sensors are respectively provided to the inlet and outlet pipes connected to the outdoor unit and the indoor unit.
9. The multi-split air conditioning system as claimed in claim 7, wherein a subcooler is provided between the first bypass and the second bypass outlet.
10. The multi-split air conditioning system as claimed in claim 7, wherein a vapor-liquid separator is provided at a front end of the suction duct of the compressor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010018929.2A CN111076279A (en) | 2020-01-08 | 2020-01-08 | Control method for updating multi-split air conditioning system and multi-split air conditioning system updating method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010018929.2A CN111076279A (en) | 2020-01-08 | 2020-01-08 | Control method for updating multi-split air conditioning system and multi-split air conditioning system updating method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111692639A (en) * | 2020-06-29 | 2020-09-22 | 广东积微科技有限公司 | Multi-connected heat recovery air conditioning system and control method thereof |
| CN113639411A (en) * | 2021-07-15 | 2021-11-12 | 青岛海尔空调器有限总公司 | Method for controlling external self-cleaning of outdoor heat exchanger |
| CN114151935A (en) * | 2021-12-07 | 2022-03-08 | 青岛海信日立空调系统有限公司 | Air conditioning system |
| CN115342489A (en) * | 2022-08-30 | 2022-11-15 | 宁波奥克斯电气股份有限公司 | Air conditioner frequency control method and device and air conditioner |
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| CN111692639A (en) * | 2020-06-29 | 2020-09-22 | 广东积微科技有限公司 | Multi-connected heat recovery air conditioning system and control method thereof |
| CN113639411A (en) * | 2021-07-15 | 2021-11-12 | 青岛海尔空调器有限总公司 | Method for controlling external self-cleaning of outdoor heat exchanger |
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| CN115342489A (en) * | 2022-08-30 | 2022-11-15 | 宁波奥克斯电气股份有限公司 | Air conditioner frequency control method and device and air conditioner |
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Application publication date: 20200428 |