CN111174336B - Air conditioner external unit, air conditioner and air conditioner control method - Google Patents
Air conditioner external unit, air conditioner and air conditioner control method Download PDFInfo
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- CN111174336B CN111174336B CN202010023773.7A CN202010023773A CN111174336B CN 111174336 B CN111174336 B CN 111174336B CN 202010023773 A CN202010023773 A CN 202010023773A CN 111174336 B CN111174336 B CN 111174336B
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000003507 refrigerant Substances 0.000 claims abstract description 118
- 239000007788 liquid Substances 0.000 claims abstract description 53
- 238000001514 detection method Methods 0.000 claims abstract description 42
- 238000010438 heat treatment Methods 0.000 claims description 30
- 238000005057 refrigeration Methods 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 8
- 238000004064 recycling Methods 0.000 claims description 5
- 238000004590 computer program Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims 1
- 238000000926 separation method Methods 0.000 abstract description 11
- 239000003921 oil Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- UUDAMDVQRQNNHZ-UHFFFAOYSA-N (S)-AMPA Chemical compound CC=1ONC(=O)C=1CC(N)C(O)=O UUDAMDVQRQNNHZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000010726 refrigerant oil Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
Classifications
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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
- F24F1/20—Electric components for separate outdoor units
- F24F1/22—Arrangement or mounting thereof
-
- 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
-
- 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
-
- 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
- F24F11/89—Arrangement or mounting of control or safety devices
-
- 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)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioner external unit, an air conditioner and an air conditioner control method. Wherein, this air conditioner outer unit includes: the first interface and the second interface are used for being connected with an air conditioner indoor unit; and one end of the pressure detection device is connected to the first interface, and the other end of the pressure detection device is connected to the second interface and is used for detecting the pressure of the refrigerant flowing out of the air conditioner and bypassing the refrigerant when the air conditioner operates. The pressure detection device is arranged between the first interface and the second interface of the external machine, the pressure of the refrigerant flowing out of the external machine is detected, the pressure of the piping is accurately fed back, measures are taken to control the operation pressure within the piping pressure-bearing range, the operation pressure of a new refrigerant is prevented from exceeding the original piping pressure-bearing range when the air conditioner is updated but the piping is not replaced, and the operation safety and stability of the unit are improved; when the air conditioner is in liquid operation, the pressure detection device can bypass the low-temperature liquid refrigerant to the compressor, and the refrigerant enters the compressor after gas-liquid separation to cool the compressor, so that the high-temperature burning out caused by the fluorine-deficiency operation of the compressor is avoided.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner external unit, an air conditioner and an air conditioner control method.
Background
Commercial multi-split air conditioner development has been put into practice for more than ten years with the last generation of R22 (refrigerant, also called refrigerant) multi-split air conditioner, and many problems have been highlighted. There is a great demand for updating the R22 multi-split system in the market at present.
Because the multi-split system is complex in piping, if the piping system is replaced, the built-in structure of a proprietor needs to be destroyed, and the engineering quantity is large and the cost is high. If the piping system is reserved, only the unit is replaced, the pressure of R410A (novel refrigerant) is higher than the pressure of R22 during operation, the original piping meets the pressure-bearing requirement of R22 refrigerant during operation, and after the piping system is replaced by the R410A refrigerant system, the pressure-bearing capacity of the original piping cannot meet the normal R410A refrigerant system. Therefore, for updating the multi-split air conditioner, the refrigerant pressure in the original piping must be controlled within the operating pressure range of the R22 refrigerant system so as to meet the requirement of not replacing the connecting pipe.
At present, most of medium-high pressure sensors in the multi-split air conditioner are arranged at the outlet of the compressor, the distance from the medium-high pressure sensors to the connecting pipe is long, the pressure of the original piping cannot be fed back accurately, and the updated piping pressure of the multi-split air conditioner cannot be monitored effectively, so that the performance of the unit is difficult to normally exert when refrigerating/heating is performed.
Aiming at the problem that the operation is affected due to the fact that the operation pressure of a new refrigerant exceeds the pressure-bearing range of an original piping when an air conditioner is updated in the prior art, no effective solution is proposed at present.
Disclosure of Invention
The embodiment of the invention provides an air conditioner external unit, an air conditioner and an air conditioner control method, which are used for solving the problem that the operation is influenced by the fact that the operation pressure of a new refrigerant exceeds the pressure-bearing range of an original piping when the air conditioner is updated in the prior art.
To solve the above technical problem, an embodiment of the present invention provides an air conditioner external unit, including a first interface and a second interface for connecting with an air conditioner internal unit, and further including: and one end of the pressure detection device is connected to the first interface, and the other end of the pressure detection device is connected to the second interface and is used for detecting the pressure of the refrigerant flowing out of the air conditioner external unit and bypassing the refrigerant when the air conditioner is in operation.
Optionally, the pressure detecting device includes: a valve and a pressure sensor connected to the valve; and the pressure sensor is used for detecting the pressure of the refrigerant flowing out of the air conditioner external unit in different operation modes according to the opening and closing conditions of the valve.
Optionally, the pressure detection device is specifically configured to bypass the refrigerant through the valve in an open state when the air conditioner is in operation.
Optionally, the valve includes: a first valve, one end of which is connected to the first interface, and the other end of which is connected to the pressure sensor, for being opened in a cooling mode and closed in a heating mode; and one end of the second valve is connected to the second interface, and the other end of the second valve is connected to the pressure sensor and is used for being closed in a refrigerating mode and opened in a heating mode.
Optionally, the first valve is: a one-way valve, solenoid valve or electronic expansion valve; and/or, the second valve is: a one-way valve, a solenoid valve or an electronic expansion valve.
Optionally, the air conditioner external unit further includes: and the first pressure switch is arranged at the first interface and is used for being disconnected when the refrigerant pressure is detected to reach a first preset pressure.
Optionally, the air conditioner external unit further includes: and the second pressure switch is arranged at the second interface and is used for being disconnected when the refrigerant pressure is detected to reach a second preset pressure.
The embodiment of the invention also provides an air conditioner, which comprises: the embodiment of the invention discloses an air conditioner outdoor unit.
The embodiment of the invention also provides an air conditioner control method which is applied to the air conditioner external unit, and comprises the following steps: determining a current operation mode of the air conditioner; detecting pressure data of a refrigerant flowing out of an air conditioner external unit according to the current operation mode; and controlling the operation of the air conditioner according to the current operation mode and the pressure data.
Optionally, detecting pressure data of the refrigerant flowing out of the air conditioner external unit according to the current operation mode includes: if the current operation mode is a refrigeration mode, opening a first valve, closing a second valve, and detecting the pressure of the refrigerant flowing out of a first interface of an air conditioner external unit through a pressure sensor; if the current operation mode is a heating mode, the first valve is closed, the second valve is opened, and the pressure of the refrigerant flowing out of the second interface of the air conditioner external unit is detected through the pressure sensor.
Optionally, controlling the operation of the air conditioner according to the current operation mode and the pressure data includes: if the current operation mode is a refrigeration mode, controlling the air conditioner to normally operate when the pressure data is smaller than a first threshold value; when the pressure data is larger than or equal to the first threshold value and smaller than the second threshold value, controlling the air conditioner to run in a frequency limiting mode; when the pressure data is larger than or equal to the second threshold value and smaller than a third threshold value, controlling the air conditioner to perform frequency-reducing operation; and when the pressure data is greater than or equal to the third threshold value, controlling the air conditioner to stop.
Optionally, controlling the operation of the air conditioner according to the current operation mode and the pressure data includes: if the current operation mode is a heating mode, controlling the air conditioner to normally operate when the pressure data is smaller than a fourth threshold value; when the pressure data is larger than or equal to the fourth threshold value and smaller than the fifth threshold value, controlling the air conditioner to run in a frequency limiting mode; when the pressure data is larger than or equal to the fifth threshold value and smaller than the sixth threshold value, controlling the air conditioner to perform frequency-reducing operation; and when the pressure data is greater than or equal to the sixth threshold value, controlling the air conditioner to stop.
Optionally, after determining the current operation mode of the air conditioner, the method further includes: in the refrigeration mode, if the first pressure switch is turned off, the air conditioner is controlled to stop; and in the heating mode, if the second pressure switch is turned off, controlling the air conditioner to stop.
The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, which when being executed by a processor, implements the method according to the embodiment of the invention.
By applying the technical scheme of the invention, the pressure detection device is arranged between the first interface and the second interface of the air conditioner external unit and is used for detecting the pressure of the refrigerant flowing out of the air conditioner external unit, so that the pressure of the piping can be accurately fed back, and further, proper control measures are adopted to control the operation pressure within the pressure bearing range of the piping, thereby avoiding the problem that the operation of the unit is affected by the operation pressure of the new refrigerant exceeding the pressure bearing range of the original piping under the condition that the air conditioner is updated but the piping is not replaced, and improving the safety and stability of the operation of the unit. Meanwhile, when the air conditioner is in liquid-carrying operation to clean and recycle old refrigerating oil, the pressure detection device can be utilized to bypass the low-temperature liquid refrigerant to the compressor, and the liquid refrigerant enters the compressor after being subjected to gas-liquid separation, so that the compressor is cooled, and the phenomenon that the compressor is burnt out due to fluorine-lack operation caused by a large amount of refrigerant accumulation in the refrigerating oil recycling device during liquid-carrying operation is avoided.
Drawings
Fig. 1 is a schematic structural diagram of an external air conditioner according to a first embodiment of the present invention;
fig. 2 is another schematic structural diagram of an external air conditioner according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an air conditioner according to a second embodiment of the present invention;
fig. 4 is a flowchart of an air conditioner control method according to a third embodiment of the present invention;
reference numerals illustrate:
1 first interface, 2 second interface, 3 other devices, 4 pressure detection device, 41 valve, 411 first valve, 412 second valve, 42 pressure sensor, 51 first pressure switch, 52 second pressure switch, 31 compressor, 32 four-way valve, 33 outdoor heat exchanger, 34 heating electronic expansion valve, 35 subcooler (plate heat exchanger), 36 supercooling electronic expansion valve, 37 gas-liquid separator, 38 low pressure sensor, A outdoor unit, B indoor unit.
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 further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The embodiment provides an air conditioner external unit, which is suitable for the condition that only a unit is replaced and the air conditioner of an original distribution pipe system is maintained for updating, for example, multi-split air conditioner updating. The pressure of the piping (namely the pressure of the refrigerant in the pipeline) can be accurately fed back, so that the unit is controlled based on the pressure, and the influence on the operation of the unit caused by the fact that the operation pressure of the new refrigerant exceeds the original piping pressure-bearing range is avoided.
Fig. 1 is a schematic structural diagram of an external air conditioner according to a first embodiment of the present invention, and as shown in fig. 1, the external air conditioner includes: the first interface 1, the second interface 2, other devices 3 (i.e. common devices arranged in the external machine, such as a compressor, an outdoor heat exchanger, a four-way valve, etc.), and a pressure detection device 4. The first interface 1 and the second interface 2 are used for being connected with an air conditioner indoor unit. The pipeline where the first connector 1 and the second connector 2 are positioned is the connecting pipe of the internal machine and the external machine.
One end of the pressure detection device 4 is connected to the first interface 1 of the air conditioner external unit, and the other end is connected to the second interface 2 of the air conditioner external unit, for detecting the pressure of the refrigerant flowing out from the air conditioner external unit, and bypassing the refrigerant when the air conditioner is in operation.
The first interface and the second interface are respectively positioned on the liquid pipe and the air pipe, and the first interface is positioned on the liquid pipe, the second interface is positioned on the air pipe, and in a refrigeration mode, refrigerant discharged by the compressor enters the outdoor heat exchanger to be condensed and then enters the liquid pipe, flows into the air conditioner through the first interface, enters the indoor heat exchanger to be evaporated, and then enters the air pipe through the second interface to return to the compressor. In the heating mode, the refrigerant discharged by the compressor enters the air pipe, flows into the air conditioner through the second interface, enters the indoor heat exchanger to be condensed, enters the liquid pipe through the first interface, then enters the outdoor heat exchanger to be evaporated, and then returns to the compressor.
Specifically, the pressure detection device can be used for bypassing the refrigerant on the liquid pipe or the air pipe when the air conditioner is in operation. For example, when the air conditioner is operated with liquid, the liquid refrigerant is bypassed to the gas-liquid separator, and the gaseous refrigerant obtained by the gas-liquid separation is sent to the compressor. The liquid carrying operation refers to the situation that liquid refrigerant exists at the suction end of the compressor in the operation process of the air conditioning unit. When the air conditioner is in liquid-carrying operation to clean and recycle the old refrigerating oil, the pressure detection device is utilized to bypass the low-temperature liquid refrigerant to the compressor, the liquid refrigerant enters the compressor after being subjected to gas-liquid separation, and the compressor is cooled, so that the phenomenon that the compressor is burnt out due to the fact that a large amount of refrigerant is accumulated in the refrigerating oil recycling device during liquid-carrying operation and is in fluorine-lack operation is avoided.
According to the embodiment, the pressure detection device is arranged between the first interface and the second interface of the air conditioner external unit and used for detecting the pressure of the refrigerant flowing out of the air conditioner external unit, the pressure of the piping can be accurately fed back, and then proper control measures are adopted to control the operation pressure within the piping pressure bearing range, so that the problem that the operation of a unit is affected due to the fact that the operation pressure of a new refrigerant exceeds the original piping pressure bearing range under the condition that the air conditioner is updated but the piping is not replaced is avoided, and the safety and stability of the operation of the unit are improved. Meanwhile, when the air conditioner is in liquid-carrying operation to clean and recycle old refrigerating oil, the pressure detection device is utilized to bypass the low-temperature liquid refrigerant to the compressor, the liquid refrigerant enters the compressor after being subjected to gas-liquid separation, and the compressor is cooled, so that the phenomenon that the compressor is burnt out due to fluorine-lack operation caused by a large amount of refrigerant accumulation in the refrigerating oil recycling device during liquid-carrying operation is avoided.
Specifically, the pressure detection device 4 includes: a valve 41 and a pressure sensor 42 connected to the valve 41. The pressure sensor 42 is used for detecting the pressure of the refrigerant flowing out of the air conditioner external unit in different operation modes according to the opening and closing condition of the valve 41. The valve is opened and closed to allow the refrigerant to flow to the pressure sensor for pressure detection.
In one embodiment, the valve 41 comprises: a first valve 411 having one end connected to the first port 1 and the other end connected to the pressure sensor 42 for being opened in the cooling mode and closed in the heating mode; a second valve 412, connected at one end to the second port 2 and at the other end to the pressure sensor 42, is adapted to be closed in the cooling mode and to be opened in the heating mode.
Through the cooperation of first valve and second valve for refrigerant gets into pressure detection device through first valve under the refrigeration mode and can't flow out through the second valve, and, refrigerant gets into pressure detection device through the second valve under the heating mode and can't flow out through first valve, thereby pressure sensor detects the pressure of the refrigerant that flows out from first interface under the refrigeration mode, and detects the pressure of the refrigerant that flows out from the second interface under the heating mode, has realized the detection of corresponding pressure.
Specifically, the first valve may be: the check valve, the electromagnetic valve or the electronic expansion valve, and the second valve can also be: a one-way valve, a solenoid valve or an electronic expansion valve. If the check valve is used, attention is paid to the conduction direction of the check valve, for example, if the first valve is a check valve, the conduction direction is the direction from the first interface to the second interface, otherwise, the pressure detection cannot be realized, and similarly, if the second valve is a check valve, the conduction direction is the direction from the second interface to the first interface.
As shown in fig. 2, the air conditioner outdoor unit may further include: the first pressure switch 51 is installed at the first interface 1, and is configured to be turned off when the refrigerant pressure is detected to reach a first preset pressure. The first preset pressure is an action threshold of the first pressure switch, namely, when the pressure value detected by the first pressure switch reaches the first preset pressure, the first pressure switch is turned off. The first preset pressure may be specifically set according to the pressure bearing capacity of the original piping, for example, the maximum pressure bearing capacity of the original piping is 3.2MPa, and then the first preset pressure may be set to 3.2MPa. Specifically, the first pressure switch 51 may be installed at the first interface of the internal machine and the external machine, or may be installed at a position near the first interface of the internal machine and the external machine.
The air conditioner external unit may further include: the second pressure switch 52 is installed at the second interface 2, and is configured to be turned off when the refrigerant pressure is detected to reach a second preset pressure. The second preset pressure is an action threshold of the second pressure switch, namely, when the pressure value detected by the second pressure switch reaches the second preset pressure, the second pressure switch is turned off. The second preset pressure may be specifically set according to the pressure bearing capacity of the original piping, for example, the maximum pressure bearing capacity of the original piping is 3.2MPa, and the second preset pressure may be set to 3.2MPa. Specifically, the second pressure switch 52 may be installed at the second interface of the internal machine and the external machine, or may be installed at a position near the second interface of the internal machine and the external machine.
Through setting up first pressure switch and second pressure switch, when arbitrary pressure switch disconnection, the unit stop operation gets into the shutdown protection, and pressure switch and above-mentioned pressure based on pressure detection device detects the control that carries out to the unit like this, has realized dual protection.
The pressure detection device is specifically used for bypassing the refrigerant through the valve in the opening state when the air conditioner is in operation, for example, bypassing the liquid refrigerant to the gas-liquid separator through the valve in the opening state when the air conditioner is in liquid operation, and conveying the gaseous refrigerant obtained by gas-liquid separation to the compressor. Specifically, when the air conditioner is in liquid-carrying operation, the first valve and the second valve are both opened, so that the refrigerant can flow through the whole pipeline of the pressure detection device, thereby bypassing the low-temperature liquid refrigerant to the gas-liquid separator, and conveying the low-temperature gaseous refrigerant obtained by gas-liquid separation to the compressor to cool the compressor.
When the unit is replaced, the refrigerant oil and impurities in the R22 system remaining in the piping need to be cleaned and recovered, so as not to affect the operation of the new R410 system. Generally, a recovery device can be arranged between an air pipe and a compressor of the unit, and the recovery of the frozen oil is realized through the operation of the unit with liquid. In the process of recovering the refrigerating oil, a unit runs with liquid, a large amount of refrigerant can be accumulated in a recovery device, and the compressor runs lack of fluorine to cause high-temperature burning out. The pipeline where the pressure detection device is located can be actually communicated with a liquid pipe and an air pipe of the unit, through reasonable arrangement of valves (for example, the first valve and the second valve are opened simultaneously), low-temperature refrigerants generated in an external machine can be conveyed to the compressor by utilizing the pipeline during refrigeration in the refrigeration process, and the refrigerant enters the compressor after gas-liquid separation to cool the compressor, so that high-temperature burning out caused by fluorine deficiency operation of the compressor is avoided. In addition, a throttling device, such as a capillary tube, can be arranged on the pipeline where the pressure detection device is positioned, and the throttling device can throttle and depressurize when the refrigerating oil is recovered, so as to control the flow of the refrigerant.
Example two
On the basis of the first embodiment, the present embodiment provides an air conditioner, including: the air conditioner outdoor unit according to the first embodiment.
The air conditioner may further include: and the controller is used for controlling the air conditioner to operate according to the current operation mode and the pressure data detected by the pressure detection device in the air conditioner external unit, and controlling the pressure detection device to bypass the refrigerant when the air conditioner operates.
According to the embodiment, the pressure detection device arranged between the first interface and the second interface of the air conditioner external unit is used for detecting the pressure of the refrigerant flowing out of the air conditioner external unit, the pressure of the piping can be accurately fed back, and then proper control measures are adopted to control the operation pressure within the pressure bearing range of the piping, so that the problem that the operation of a unit is affected due to the fact that the operation pressure of a new refrigerant exceeds the pressure bearing range of the original piping under the condition that the air conditioner is updated but the piping is not replaced is avoided, and the safety and stability of the operation of the unit are improved. Meanwhile, when the air conditioner is in liquid-carrying operation to clean and recycle old refrigerating oil, the pressure detection device is utilized to bypass the low-temperature liquid refrigerant to the compressor, the liquid refrigerant enters the compressor after being subjected to gas-liquid separation, and the compressor is cooled, so that the phenomenon that the compressor is burnt out due to fluorine-lack operation caused by a large amount of refrigerant accumulation in the refrigerating oil recycling device during liquid-carrying operation is avoided.
Referring to fig. 3, the first valve 411 is taken as a one-way valve, and the second valve 412 is taken as a solenoid valve, however, it should be noted that this embodiment is only for better illustrating the present application, and is not meant to be unduly limiting.
In the refrigeration mode, the flow direction of the relevant refrigerant for pressure detection is as follows: 31- & gt 32- & gt 33- & gt 34- & gt 35- & gt 411- & gt 42, the second valve 412 is closed, and the refrigerant cannot flow into the air pipe, so that the pressure sensor 42 can detect the pressure of the refrigerant flowing out of the outdoor unit, namely the pressure of the refrigerant in the liquid pipe.
In the heating mode, the refrigerant flow direction related to the pressure detection is as follows: 31- & gt 32- & gt 412- & gt 42, the first valve 411 is closed, and the refrigerant cannot flow to the liquid pipe, so that the pressure sensor 42 can detect the pressure of the refrigerant in the air pipe.
As can be seen, the pressure sensor 42 serves as a medium pressure sensor for detecting the refrigerant pressure of the outdoor unit during cooling; the device is used as a high-pressure sensor in heating to detect the pressure of the refrigerant at the high-pressure side. The low pressure sensor 38 detects the evaporation pressure of the refrigerant in both the cooling mode and the heating mode.
The first pressure switch 51 is located in the liquid pipe, the second pressure switch 52 is located in the air pipe, and the second pressure switch is specifically located at the refrigerant outlet position of the external machine. The operation threshold of the pressure switch is set according to the pressure bearing capacity of the original piping. When the pressure of the refrigerant passing through the first pressure switch or the second pressure switch reaches the corresponding switch action threshold, the unit stops running, the double protection effect is achieved, and the unit is safer to run.
In addition, in fig. 3, when the air conditioner is in operation with liquid, the first valve 411 and the second valve 412 are opened, so that the refrigerant can circulate in the pipeline of the pressure detection device 4, and the low-temperature liquid refrigerant is bypassed to the gas-liquid separator for gas-liquid separation and then enters the compressor for cooling.
Example III
The present embodiment provides an air conditioner control method, which can be applied to the air conditioner outdoor unit described in the first embodiment or the air conditioner described in the second embodiment.
Fig. 4 is a flowchart of an air conditioner control method according to a third embodiment of the present invention, as shown in fig. 4, the method includes:
s401, determining a current operation mode of the air conditioner.
S402, detecting pressure data of a refrigerant flowing out of the air conditioner according to a current operation mode.
S403, controlling the operation of the air conditioner according to the current operation mode and the pressure data.
According to the embodiment, the pressure data of the refrigerant flowing out of the air conditioner external unit is detected according to the current operation mode, then the operation of the unit is controlled by combining the current operation mode and the pressure data, and the operation pressure of the refrigerant can be controlled within the pressure bearing range of the piping, so that the problem that the operation of the unit is affected by the fact that the operation pressure of the new refrigerant exceeds the pressure bearing range of the original piping under the condition that the air conditioner is updated but the piping is not replaced is avoided, and the safety and stability of the operation of the unit are improved.
In one embodiment, detecting pressure data of a refrigerant flowing out of an air conditioner external unit according to a current operation mode includes: if the current operation mode is a refrigeration mode, opening a first valve, closing a second valve, and detecting the pressure of the refrigerant flowing out of a first interface of the air conditioner through a pressure sensor; if the current operation mode is a heating mode, the first valve is closed, the second valve is opened, and the pressure of the refrigerant flowing out of the second interface of the air conditioner external unit is detected through the pressure sensor.
In the present embodiment, during cooling, the pressure sensor serves as a medium pressure sensor to detect the refrigerant pressure of the outdoor unit; when heating, the pressure sensor serves as a high-pressure sensor to detect the pressure of the refrigerant at the high pressure side. The pressure detection of the refrigerant output by the external machine under different modes is realized by utilizing the opening and closing conditions of the valve, the pressure of the piping can be accurately fed back, and the control based on the pressure is guaranteed.
In one embodiment, controlling operation of the air conditioner according to a current operation mode and pressure data includes:
if the current operation mode is a refrigeration mode, controlling the air conditioner to normally operate when the pressure data is smaller than a first threshold value; when the pressure data is larger than or equal to the first threshold value and smaller than the second threshold value, controlling the air conditioner to run in a frequency limiting mode; when the pressure data is larger than or equal to the second threshold value and smaller than the third threshold value, controlling the air conditioner to run in a frequency-reducing mode; when the pressure data is greater than or equal to a third threshold value, controlling the air conditioner to stop;
if the current operation mode is a heating mode, controlling the air conditioner to normally operate when the pressure data is smaller than a fourth threshold value; when the pressure data is larger than or equal to the fourth threshold value and smaller than the fifth threshold value, controlling the air conditioner to run in a frequency limiting mode; when the pressure data is larger than or equal to a fifth threshold value and smaller than a sixth threshold value, controlling the air conditioner to perform frequency-reducing operation; and when the pressure data is greater than or equal to a sixth threshold value, controlling the air conditioner to stop.
The first threshold value, the second threshold value and the third threshold value are sequentially increased, and the fourth threshold value, the fifth threshold value and the sixth threshold value are sequentially increased. The first to sixth thresholds may be set according to the maximum bearing pressure of the original pipe, and there is no necessary magnitude relation between the thresholds in different modes. How the condition equal to the threshold value controls the air conditioner may be set according to actual requirements, which is only an example. Normal operation means that the compressor frequency can be changed according to the requirements, i.e. output according to normal capacity; the frequency limiting operation means that the frequency of the compressor is limited, even if the demand increases, the compressor is maintained to operate within a certain frequency range, the frequency is not allowed to be increased, namely the capacity output is limited, so that the current pressure is prevented from continuously increasing; down-running refers to reducing the compressor frequency, i.e., the capacity output, such that the current larger pressure drops. Under the refrigerating mode or the heating mode, a plurality of thresholds are set for hierarchical control, so that the advanced control can be realized, the running state of the air conditioner can be timely changed, and the piping pressure is prevented from exceeding the bearing range.
In addition, if a pressure switch is provided, after determining the current operation mode of the air conditioner, the method further comprises: in the refrigeration mode, if the first pressure switch is turned off, the air conditioner is controlled to stop; and in the heating mode, if the second pressure switch is turned off, controlling the air conditioner to stop. The pressure switch is arranged, and the pressure detection and control are combined, so that the unit can safely and reliably operate, and double protection is provided.
The air conditioning control method will be described below with reference to the air conditioner shown in fig. 3.
During refrigeration operation, the high-temperature and high-pressure refrigerant discharged by the compressor 31 enters the liquid pipe through the four-way valve 32 and the outdoor heat exchanger 33, flows into the first valve 411, the second valve 412 is closed, the pressure sensor 42 is used as a medium pressure sensor, and the pressure value of the refrigerant entering the connecting pipe from the outdoor unit is detected and used for adjusting the operation of the unit. Specifically, when the pressure is smaller than zMPa, the unit outputs according to the normal capacity; when the pressure is epsilon [ z, y), limiting the capacity output of the unit; when the pressure is epsilon [ y, x), the unit can reduce the capacity and output; when the pressure e x is such that, ++ infinity in the time-course of which the first and second contact surfaces, and the machine set is protected and stopped. Or the first pressure switch 51 is operated to protect the machine from being stopped.
During heating, the high-temperature and high-pressure refrigerant discharged by the compressor 31 enters the air pipe through the four-way valve 32, the second valve 412 is opened, the refrigerant cannot be led to the liquid pipe because the first valve 411 is a one-way valve, and the pressure sensor 42 is used as a high-pressure sensor to collect the refrigerant pressure at the high-pressure side. The data collected by the pressure sensor 42 will be used as a basis for the operation of the unit. Specifically, when the pressure is smaller than aMPa, the unit outputs according to the normal capacity; when the pressure is E [ a, b), the unit limits the capacity output; when the pressure is E [ b, c), the unit is reduced in capacity and output; when the pressure is epsilon [ c, ++ infinity), the protection is stopped. Or the second pressure switch 52 is actuated to protect against shutdown.
Therefore, the running state of the unit is adjusted in real time according to the pressure data detected by the pressure sensor in the refrigerating mode and the heating mode, so that the system can run safely and reliably, and the pressure switch is utilized to provide the effect of double protection.
In addition, when the air conditioner is in liquid carrying operation, the first valve and the second valve can be opened, the bypass function of the pressure detection device is realized, the liquid refrigerant is bypassed to the gas-liquid separator by the pressure detection device, and the gaseous refrigerant obtained by gas-liquid separation is conveyed to the compressor to cool the compressor, so that the phenomenon that the compressor is burnt out due to the fact that a large amount of refrigerant is accumulated in the refrigeration oil recovery device during liquid carrying operation and is in fluorine-deficiency operation is avoided.
Example IV
The present embodiment provides an air conditioner control device, which may be used to implement the air conditioner control method described in the third embodiment. The apparatus may be implemented in software and/or hardware, and may be generally integrated into an air conditioner controller. The device comprises:
and the determining module is used for determining the current operation mode of the air conditioner.
And the detection module is used for detecting pressure data of the refrigerant flowing out of the air conditioner according to the current operation mode.
And the first control module is used for controlling the operation of the air conditioner according to the current operation mode and the pressure data.
Optionally, the detection module is specifically configured to: if the current operation mode is a refrigeration mode, opening a first valve, closing a second valve, and detecting the pressure of the refrigerant flowing out of a first interface of the air conditioner through a pressure sensor; if the current operation mode is a heating mode, the first valve is closed, the second valve is opened, and the pressure of the refrigerant flowing out of the second interface of the air conditioner external unit is detected through the pressure sensor.
Optionally, the first control module is specifically configured to: if the current operation mode is a refrigeration mode, controlling the air conditioner to normally operate when the pressure data is smaller than a first threshold value; when the pressure data is larger than or equal to the first threshold value and smaller than the second threshold value, controlling the air conditioner to run in a frequency limiting mode; when the pressure data is larger than or equal to the second threshold value and smaller than the third threshold value, controlling the air conditioner to run in a frequency-reducing mode; and when the pressure data is greater than or equal to a third threshold value, controlling the air conditioner to stop.
Optionally, the first control module is further configured to: if the current operation mode is a heating mode, controlling the air conditioner to normally operate when the pressure data is smaller than a fourth threshold value; when the pressure data is larger than or equal to the fourth threshold value and smaller than the fifth threshold value, controlling the air conditioner to run in a frequency limiting mode; when the pressure data is larger than or equal to a fifth threshold value and smaller than a sixth threshold value, controlling the air conditioner to perform frequency-reducing operation; and when the pressure data is greater than or equal to a sixth threshold value, controlling the air conditioner to stop.
Optionally, the device further comprises a second control module, configured to control the air conditioner to stop in a refrigeration mode after determining the current operation mode of the air conditioner, if the first pressure switch is turned off; and in the heating mode, if the second pressure switch is turned off, controlling the air conditioner to stop.
The device can execute the method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. Technical details not described in detail in this embodiment may be referred to the method provided in the embodiment of the present invention.
Example five
The present embodiment provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method as described in the third embodiment above.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (12)
1. An air conditioner external unit, includes first interface and the second interface that is used for being connected with the air conditioner internal unit, its characterized in that, air conditioner external unit still includes:
the pressure detection device is connected with the first interface at one end and the second interface at the other end, and is used for detecting the pressure of the refrigerant flowing out of the air conditioner external unit and bypassing the refrigerant when the air conditioner is in liquid carrying operation for cleaning and recycling the old refrigerating oil;
the pressure detection device includes: a valve and a pressure sensor connected to the valve;
the pressure sensor is used for detecting the pressure of the refrigerant flowing out of the air conditioner external unit in different operation modes according to the opening and closing conditions of the valve;
the valve comprises:
a first valve, one end of which is connected to the first interface, and the other end of which is connected to the pressure sensor, for being opened in a cooling mode and closed in a heating mode;
and one end of the second valve is connected to the second interface, and the other end of the second valve is connected to the pressure sensor and is used for being closed in a refrigerating mode and opened in a heating mode.
2. The outdoor unit of claim 1, wherein the pressure detecting device is specifically configured to bypass refrigerant through the valve in an open state when the air conditioner is in operation.
3. The outdoor unit of claim 1, wherein the first valve is: a one-way valve, solenoid valve or electronic expansion valve; and/or, the second valve is: a one-way valve, a solenoid valve or an electronic expansion valve.
4. The outdoor unit of claim 1, further comprising: and the first pressure switch is arranged at the first interface and is used for being disconnected when the refrigerant pressure is detected to reach a first preset pressure.
5. The outdoor unit of claim 1, further comprising: and the second pressure switch is arranged at the second interface and is used for being disconnected when the refrigerant pressure is detected to reach a second preset pressure.
6. An air conditioner, comprising: an air conditioner external unit according to any one of claims 1 to 5.
7. An air conditioner control method, characterized by being applied to the air conditioner outdoor unit according to any one of claims 1 to 5, comprising:
determining a current operation mode of the air conditioner;
detecting pressure data of a refrigerant flowing out of an air conditioner external unit according to the current operation mode;
and controlling the operation of the air conditioner according to the current operation mode and the pressure data.
8. The method of claim 7, wherein detecting pressure data of the refrigerant flowing from the air conditioner outdoor unit according to the current operation mode, comprises:
if the current operation mode is a refrigeration mode, opening a first valve, closing a second valve, and detecting the pressure of the refrigerant flowing out of a first interface of an air conditioner external unit through a pressure sensor;
if the current operation mode is a heating mode, the first valve is closed, the second valve is opened, and the pressure of the refrigerant flowing out of the second interface of the air conditioner external unit is detected through the pressure sensor.
9. The method of claim 7, wherein controlling operation of the air conditioner according to the current operation mode and the pressure data comprises:
if the current operation mode is a refrigeration mode, controlling the air conditioner to normally operate when the pressure data is smaller than a first threshold value;
when the pressure data is larger than or equal to the first threshold value and smaller than the second threshold value, controlling the air conditioner to run in a frequency limiting mode;
when the pressure data is larger than or equal to the second threshold value and smaller than a third threshold value, controlling the air conditioner to perform frequency-reducing operation;
and when the pressure data is greater than or equal to the third threshold value, controlling the air conditioner to stop.
10. The method of claim 7, wherein controlling operation of the air conditioner according to the current operation mode and the pressure data comprises:
if the current operation mode is a heating mode, controlling the air conditioner to normally operate when the pressure data is smaller than a fourth threshold value;
when the pressure data is larger than or equal to the fourth threshold value and smaller than a fifth threshold value, controlling the air conditioner to perform frequency limiting operation;
when the pressure data is larger than or equal to the fifth threshold value and smaller than the sixth threshold value, controlling the air conditioner to perform frequency-reducing operation;
and when the pressure data is greater than or equal to the sixth threshold value, controlling the air conditioner to stop.
11. The method of claim 7, further comprising, after determining the current operating mode of the air conditioner:
in the refrigeration mode, if the first pressure switch is turned off, the air conditioner is controlled to stop;
and in the heating mode, if the second pressure switch is turned off, controlling the air conditioner to stop.
12. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method according to any one of claims 7 to 11.
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| CN112146227B (en) * | 2020-08-31 | 2022-04-12 | 珠海格力电器股份有限公司 | Pressure detection switch, air conditioner control method and device, air conditioner and storage medium |
| CN112665098A (en) * | 2020-12-09 | 2021-04-16 | 珠海格力电器股份有限公司 | Air conditioner pipeline pressure control method, controller and air conditioner |
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