WO2017185517A1

WO2017185517A1 - Cooling and heating air conditioner, cooling-only air conditioner, and control method for air conditioner

Info

Publication number: WO2017185517A1
Application number: PCT/CN2016/087936
Authority: WO
Inventors: 刘湍顺; 李金波; 戚文端; 杨亚新; 陈明瑜; 任超; 孙兴
Original assignee: 广东美的制冷设备有限公司; 美的集团股份有限公司
Priority date: 2016-04-29
Filing date: 2016-06-30
Publication date: 2017-11-02

Abstract

A cooling and heating air conditioner (100), cooling-only air conditioner (100), and control method for an air conditioner. The cooling and heating air conditioner (100) comprises: a two-cylinder compressor (1), a reversing assembly (2), an outdoor heat exchanger (3), an indoor heat exchanger (4), and a vapor-liquid separator (5). The two-cylinder compressor (1) comprises a first cylinder (11), a second cylinder (12), a first liquid storage (13), and a second liquid storage (14). An air suction port of the first cylinder (11) is in communication with the first liquid storage (13), and an air suction port of the second cylinder (12) is in communication with the second liquid storage (14). An air discharge volume ratio of the second cylinder (12) to the first cylinder (11) has a value within the range of 1-10%.

Description

Cooling and heating type air conditioner, single cold type air conditioner and air conditioner control method

Technical field

The invention relates to the field of refrigeration, and in particular to a control method for a cold and warm air conditioner, a single cold air conditioner and an air conditioner.

Background technique

At present, the air conditioning refrigeration system does not optimize the circulation design of the gaseous refrigerant before the throttle and enters the evaporator, which causes the gaseous refrigerant to affect the heat exchange performance of the evaporator and increase the compression power consumption of the compressor, thereby affecting the energy efficiency level of the air conditioner. . Jet boosting and two-stage compression technology can improve the heating capacity of air conditioning systems at low and ultra-low temperatures, but for the cooling conditions often used in air conditioners, energy efficiency is very limited.

Summary of the invention

The present invention aims to solve at least one of the technical problems in the related art to some extent.

To this end, the present invention proposes a cold and warm type air conditioner, which can effectively improve the energy efficiency of the air conditioner and effectively promote energy saving and emission reduction.

The invention also provides a single-cooling type air conditioner, which can effectively improve the energy efficiency of the air conditioner and effectively promote energy saving and emission reduction.

The invention further proposes a control method for an air conditioner.

A cold and warm type air conditioner according to an embodiment of the present invention includes: a two-cylinder compressor including a casing, a first cylinder, a second cylinder, a first accumulator, and a second accumulator, An exhaust port is disposed on the housing, the first cylinder and the second cylinder are respectively disposed in the housing, and the first accumulator and the second accumulator are disposed outside the housing. An intake port of the first cylinder is in communication with the first accumulator, and an intake port of the second cylinder is in communication with the second accumulator, the second cylinder and the first cylinder The exhaust volume ratio value ranges from 1% to 10%; the reversing assembly includes a first valve port to a fourth valve port, the first valve port and the second valve port and the third valve port One of the ports is in communication, the fourth valve port is in communication with the other of the second valve port and the third valve port, the first valve port is connected to the exhaust port, the fourth valve a port connected to the first accumulator; an outdoor heat exchanger and an indoor heat exchanger, the first end of the outdoor heat exchanger being connected to the second valve port, the chamber a first end of the heat exchanger is connected to the third valve port; a gas-liquid separator comprising a gas outlet, a first interface and a second interface, the gas outlet and the second liquid storage Connected to the second end of the outdoor heat exchanger, the second interface is connected to the second end of the indoor heat exchanger, the first interface and the outdoor heat exchange A first throttle element is connected in series between the two ends, and a second throttle element is connected in series between the second interface and the indoor heat exchanger.

According to the cold and warm type air conditioner of the embodiment of the present invention, the air conditioner can be effectively improved by providing the above two-cylinder compressor Energy efficiency, effectively promote energy saving and emission reduction, and at the same time, by setting up a gas-liquid separator, heat exchange efficiency can be improved, compressor compression power consumption can be reduced, air conditioner capacity and energy efficiency can be further improved, and double cylinder can be extended by setting a second liquid storage device. The service life of the compressor.

In some embodiments of the invention, a solenoid valve is connected in series between the gas outlet and the second reservoir.

In some embodiments of the invention, the volume of the gas-liquid separator ranges from 100 mL to 500 mL.

In some embodiments of the invention, the volume of the first reservoir is greater than the volume of the second reservoir.

A single-cooling type air conditioner according to an embodiment of the present invention includes: a two-cylinder compressor including a casing, a first cylinder, a second cylinder, a first accumulator, and a second accumulator, An exhaust port is disposed on the housing, the first cylinder and the second cylinder are respectively disposed in the housing, and the first accumulator and the second accumulator are disposed outside the housing The intake port of the first cylinder is in communication with the first accumulator, and the intake port of the second cylinder is in communication with the second accumulator, the second cylinder and the first cylinder The exhaust volume ratio ranges from 1% to 10%; the outdoor heat exchanger and the indoor heat exchanger, the first end of the outdoor heat exchanger is connected to the exhaust port, and the indoor heat exchanger a first end connected to the first accumulator; a gas-liquid separator comprising a gas outlet, a first interface and a second interface, the gas outlet being connected to the second reservoir The first interface is connected to the second end of the outdoor heat exchanger, and the second interface is connected to the second end of the indoor heat exchanger. The first throttle element connected in series between the first interface and the outdoor heat exchanger, a second throttle element connected in series between said second interface and the indoor heat exchanger.

According to the single-cooling type air conditioner of the embodiment of the present invention, by providing the above-mentioned two-cylinder compressor, the energy efficiency of the air conditioner can be effectively improved, energy saving and emission reduction can be effectively promoted, and the heat exchange efficiency can be improved and the compressor can be reduced by providing the gas-liquid separator. Compressed power consumption, further improve the capacity and energy efficiency of the air conditioner, and by setting the second accumulator, the service life of the two-cylinder compressor can be extended.

According to the control method of the air conditioner according to the embodiment of the present invention, the air conditioner is the cold and warm type air conditioner according to the above embodiment of the present invention, or the single cold type air conditioner according to the above embodiment of the present invention, when the air conditioner is operated, The first throttling element and the throttling element located upstream of the second throttling element are primary throttling elements, and throttling elements located downstream of the first throttling element and the second throttling element The second throttle element; when the opening degrees of the first throttle element and the second throttle element are both adjustable, the control method includes the following steps: first adjusting according to the detection result of the first detection object Opening the first-order throttling element to a set opening degree, and then adjusting the opening degree of the secondary throttling element to a set opening degree according to a detection result of the second detecting object, the primary throttling element The set opening degree is smaller than the set opening degree of the secondary throttle element, and the detection result of the first detection object is different from the detection result of the second detection object; when the first throttle element and the One of the second throttle elements is open When the degree of opening is fixed and the other adjustable, said control The method includes the following steps: adjusting the opening degree of the throttle element with adjustable opening degree to the set opening degree according to the detection result of the first detection object during the cooling operation; when the air conditioner is a cold and warm type air conditioner, The thermal operation further adjusts the opening degree of the throttle element adjustable in opening degree to the set opening degree according to the detection result of the second detecting object; when the opening degree of the first throttle element and the second throttle element When both are fixed, the control method includes the steps of: adjusting an operating frequency of the two-cylinder compressor to meet a condition according to the detected compressor operating parameter and/or an outdoor ambient temperature, wherein the compressor operating parameter includes an operating current At least one of an exhaust pressure and an exhaust temperature; wherein the first detection object includes an outdoor ambient temperature, an operating frequency of the two-cylinder compressor, an exhaust temperature of the exhaust port, an exhaust pressure of the exhaust port, and a slave At least one of an intermediate pressure of the refrigerant discharged from the gas outlet, an intermediate temperature of the refrigerant discharged from the gas outlet, a gas-liquid separator temperature, and a gas-liquid separator pressure; the second detection target The outdoor ambient temperature, the operating frequency of the two-cylinder compressor, the exhaust temperature of the exhaust port, the exhaust pressure of the exhaust port, the intermediate pressure of the refrigerant discharged from the gas outlet, and the refrigerant discharged from the gas outlet At least one of an intermediate temperature, a gas-liquid separator temperature, and a gas-liquid separator pressure.

The control method of the air conditioner according to the embodiment of the present invention makes the energy efficiency of the system optimal.

In some embodiments of the present invention, the first detection object and/or the second detection object are an outdoor ambient temperature T4 and an operating frequency F, and are calculated according to the detected outdoor ambient temperature T4 and the operating frequency F. The corresponding throttle element with adjustable opening degree sets the opening degree, and then adjusts the opening degree of the corresponding throttle element according to the set opening degree.

In some embodiments of the present invention, the first detection object and/or the second detection object are an outdoor ambient temperature T4, an operating frequency F, and an exhaust pressure; or an outdoor ambient temperature T4, an operating frequency F, and a row The gas temperature is first calculated according to the outdoor ambient temperature T4 and the operating frequency F to obtain a set exhaust pressure or set an exhaust temperature, and then adjust the corresponding opening according to the actually detected exhaust pressure or exhaust temperature. The opening of the throttle element is adjusted such that the detected exhaust pressure or exhaust temperature reaches a set exhaust pressure or sets an exhaust temperature.

In some embodiments of the present invention, a plurality of outdoor temperature intervals are preset, each of the outdoor temperature intervals corresponding to an opening degree of a different throttling element, and the first detecting object and/or the second detecting object is an outdoor ambient temperature T4 And adjusting the opening degree of the throttle element with adjustable opening degree according to the opening degree value corresponding to the outdoor temperature range in which the actually detected outdoor environmental temperature T4 is located.

In some embodiments of the present invention, the intermediate temperature or the preset intermediate pressure is preset, and the first detection object and/or the second detection object is an intermediate pressure or an intermediate temperature, and is adjusted according to the actually detected intermediate pressure or intermediate temperature. The opening of the throttle element, which is adjustable in opening degree, is such that the detected intermediate pressure or intermediate temperature reaches a preset intermediate pressure or a preset intermediate temperature.

In some embodiments of the present invention, a plurality of outdoor temperature intervals are preset, each of the outdoor temperature intervals corresponding to a different set temperature of the gas-liquid separator, the first detection object and/or the first The second detection object is the outdoor ambient temperature T4 and the temperature of the gas-liquid separator. First, according to the actually detected outdoor ambient temperature T4, the set temperature of the gas-liquid separator corresponding to the outdoor temperature interval is obtained, and then the corresponding opening is adjusted. Adjustable throttle element opening to the real The temperature of the gas-liquid separator detected satisfies the set temperature.

In some embodiments of the present invention, when the opening degrees of the first throttle element and the second throttle element are both fixed, a plurality of different exhaust temperature intervals are preset, the plurality of exhaust temperatures The adjustment command of the operating frequency corresponding to the interval is different, and the exhaust gas temperature is detected and the operating frequency is adjusted according to an adjustment command corresponding to the exhaust gas temperature range in which the detected exhaust gas temperature is located.

In some embodiments of the present invention, when the opening degrees of the first throttle element and the second throttle element are both fixed, a plurality of outdoor temperature intervals, a heating shutdown protection current, and a cooling shutdown protection current are preset. The plurality of outdoor temperature intervals correspond to different frequency limiting protection currents, first detecting the outdoor ambient temperature, and then obtaining a corresponding frequency limiting protection current according to the detected outdoor temperature interval in which the outdoor ambient temperature is located, and adjusting the operating frequency to The actually detected operating current reaches the corresponding frequency limiting protection current, wherein the operating current detected when cooling is greater than the cooling shutdown protection current is directly stopped; the operating current detected when heating If it is greater than the heating shutdown protection current, it will stop directly.

In some embodiments of the present invention, when the opening degrees of the first throttle element and the second throttle element are both fixed, a plurality of different exhaust pressure intervals are preset, the plurality of exhaust pressures The adjustment command of the operating frequency corresponding to the interval is different, the exhaust pressure is detected, and the operating frequency is adjusted according to an adjustment command corresponding to the exhaust pressure range in which the detected exhaust pressure is located.

DRAWINGS

1 to 2 are schematic views of a cold and warm type air conditioner according to various embodiments of the present invention;

3 to 4 are schematic views of a single-cooling type air conditioner according to various embodiments of the present invention;

Figure 5 is a schematic illustration of a two-cylinder compressor in accordance with an embodiment of the present invention;

6 is a flow chart of a control method for cooling a cold-air type air conditioner/single-cool type air conditioner according to an embodiment of the present invention, wherein opening degrees of the first throttle element and the second throttle element are both adjustable;

7 is a flow chart of a control method for heating and heating of a cold and warm air conditioner according to an embodiment of the present invention, wherein opening degrees of the first throttle element and the second throttle element are both adjustable;

8 is a flow chart of a control method for cooling a cold air type air conditioner/single cold type air conditioner according to an embodiment of the present invention, wherein a first throttle element opening degree is fixed, and a second throttle element opening degree is adjustable;

9 is a flow chart of a control method for heating and heating of a cold and warm air conditioner according to an embodiment of the present invention, wherein a first throttle element has a fixed opening degree, and a second throttle element has an adjustable opening degree;

10 is a flow chart of a control method for cooling a cold-air type air conditioner/single-cool type air conditioner according to an embodiment of the present invention, wherein a first throttle element opening degree is adjustable, and a second throttle element opening degree is fixed;

11 is a flow chart showing a control method of a heating and cooling type air conditioner during heating according to an embodiment of the present invention, wherein the first throttle The opening of the component is adjustable, and the opening of the second throttle element is fixed;

12 is a flowchart of a control method of a cold and warm air conditioner according to an embodiment of the present invention, in which opening degrees of the first throttle element and the second throttle element are fixed;

Fig. 13 is a flowchart of a control method of a single-cooling type air conditioner in which opening degrees of the first throttle element and the second throttle element are fixed, according to an embodiment of the present invention.

Reference mark:

Cooling and heating air conditioner (single cold air conditioner) 100,

a two-cylinder compressor 1, a casing 10, a first cylinder 11, a second cylinder 12, a first accumulator 13, a second accumulator 14, an exhaust port 15,

Reversing assembly 2, first valve port D, second valve port C, third valve port E, fourth valve port S,

Outdoor heat exchanger 3, indoor heat exchanger 4,

Gas-liquid separator 5, gas outlet m, first interface f, second interface g,

a first throttle element 6, a second throttle element 7,

Solenoid valve 20.

detailed description

Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " After, "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship of the "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplified description, and does not indicate or imply the indicated device or component. It must be constructed and operated in a particular orientation, and is not to be construed as limiting the invention.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" or "second" may include at least one of the features, either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical connections, electrical connections or communication with each other; can be directly connected, or indirectly through intermediate media The connection may be internal to the two elements or the interaction of the two elements, unless explicitly defined otherwise. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

A cooling and heating type air conditioner 100 according to an embodiment of the present invention will be described in detail below with reference to Figs. 1 to 2 and Fig. 5, wherein the cooling and heating type air conditioner 100 has a cooling mode and a heating mode.

As shown in FIG. 1 and FIG. 2, the air-conditioning type air conditioner 100 according to the embodiment of the present invention includes: a two-cylinder compressor 1, a reversing unit 2, an outdoor heat exchanger 3, and an indoor heat exchanger 4, and a gas. The liquid separator 5, the first throttle element 6 and the second throttle element 7. The two-cylinder compressor 1 includes a casing 10, a first cylinder 11, a second cylinder 12, a first accumulator 13 and a second accumulator 14, and the casing 10 is provided with an exhaust port 15, a first cylinder 11 And the second cylinder 12 is respectively disposed in the casing 10, and the first accumulator 13 and the second accumulator 14 are disposed outside the casing 10, and the intake port of the first cylinder 11 is in communication with the first accumulator 13, The intake port of the second cylinder 12 is in communication with the second accumulator 14. That is, the first cylinder 11 and the second cylinder 12 perform an independent compression process, and the gas refrigerant separated from the first accumulator 13 is discharged into the first cylinder 11 for compression, and is separated from the second accumulator 14. The gas refrigerant is discharged into the second cylinder 12 for compression, and the compressed refrigerant discharged from the first cylinder 11 and the compressed refrigerant discharged from the second cylinder 12 are discharged into the casing 10 and then from the exhaust port. 15 discharge.

The ratio of the exhaust volume ratio of the second cylinder 12 and the first cylinder 11 ranges from 1% to 10%. Further, the ratio of the exhaust volume ratio of the second cylinder 12 and the first cylinder 11 ranges from 1% to 9%. Preferably, the ratio of the exhaust volume ratio of the second cylinder 12 and the first cylinder 11 ranges from 4% to 9%. For example, the exhaust volume ratio of the second cylinder 12 and the first cylinder 11 may be a parameter such as 4%, 5%, 8%, or 8.5%.

The reversing assembly 2 includes a first valve port D to a fourth valve port S, the first valve port D is in communication with one of the second valve port C and the third valve port E, and the fourth valve port S and the second valve port C communicates with the other of the third valve ports E, the first valve port D is connected to the exhaust port 15, and the fourth valve port S is connected to the first accumulator 13. The first end of the outdoor heat exchanger 3 is connected to the second valve port C, and the first end of the indoor heat exchanger 4 is connected to the third valve port E. Specifically, when the cold and warm air conditioner 100 is cooled, the first valve port D is in communication with the second valve port C and the third valve port E is in communication with the fourth valve port S. When the cold and warm air conditioner 100 is heated, the first The valve port D communicates with the third valve port E and the second valve port C communicates with the fourth valve port S. Preferably, the reversing assembly 2 is a four-way valve.

The gas-liquid separator 5 includes a gas outlet m, a first interface f and a second interface g, the gas outlet m is connected to the second reservoir 14, the first interface f is connected to the second end of the outdoor heat exchanger 3, and the second The interface g is connected to the second end of the indoor heat exchanger 4, the first throttle element 6 is connected in series between the first interface f and the outdoor heat exchanger 3, and the second interface g and the indoor heat exchanger 4 are connected in series. Two throttle elements 7. In some examples of the invention, the opening degrees of the first throttle element 6 and the second throttle element 7 are both adjustable, optionally, the first throttle element 6 is an electronic expansion valve, and the second throttle element 7 is The electronic expansion valve, of course, can be understood that the first throttle element 6 and the second throttle element 7 can also be other adjustable opening elements such as thermal expansion valves.

In other examples of the invention, the opening of the first throttle element 6 is adjustable and the opening of the second throttle element 7 is fixed, optionally the first throttle element 6 is an electronic expansion valve, the second section The flow element 7 is a capillary or a throttle valve. It will of course be understood that the first throttle element 6 can also be other open-width adjustable elements such as a thermal expansion valve.

In still other examples of the invention, the opening of the first throttle element 6 is fixed and the opening of the second throttle element 7 is fixed, optionally the first throttle element 6 is a capillary or a throttle valve, and second The throttle element 7 is an electronic expansion valve, although it will of course be understood that the second throttle element 7 can also be other adjustable opening elements such as a thermal expansion valve.

In still other examples of the present invention, the opening degrees of the first throttle element 6 and the second throttle element 7 are both fixed. Alternatively, both the first throttle element 6 and the second throttle element 7 may be capillary tubes or Throttle valve.

When the cold-air type air conditioner 100 is cooled, the high-temperature high-pressure refrigerant discharged from the exhaust port 15 of the two-cylinder compressor 1 is discharged into the outdoor heat exchanger 3 through the first valve port D and the second valve port C to perform condensation heat dissipation. The high-pressure liquid refrigerant discharged from the outdoor heat exchanger 3 is discharged from the first port f to the gas-liquid separator 5 through the first-stage throttling and depressurization of the first throttling element 6, and the gas-liquid separation is performed, and the separated intermediate pressure is performed. The gaseous refrigerant is discharged from the gas outlet m into the second accumulator 14 for further gas-liquid separation, and then the gaseous refrigerant is discharged from the second accumulator 14 into the second cylinder 12 for compression.

The intermediate pressure liquid refrigerant discharged from the second port g of the gas-liquid separator 5 is depressurized by the secondary throttling of the second throttling element 7 and then discharged into the indoor heat exchanger 4 for heat exchange to reduce the indoor ambient temperature. The refrigerant discharged from the indoor heat exchanger 4 is discharged into the first accumulator 13 through the third port E and the fourth port S, and the refrigerant discharged from the first accumulator 13 is discharged into the first cylinder 11 Compress.

When the cold and warm air conditioner 100 is heated, the high temperature and high pressure refrigerant discharged from the exhaust port 15 of the twin cylinder compressor 1 is discharged into the indoor heat exchanger 4 through the first valve port D and the third valve port E for condensation heat dissipation. In order to increase the indoor ambient temperature, the high-pressure liquid refrigerant discharged from the indoor heat exchanger 4 is depressurized by the first throttling element 7 and then discharged from the second port g into the gas-liquid separator 5 for gas-liquid separation. The separated, separated intermediate pressure gaseous refrigerant is discharged from the gas outlet m into the second accumulator 14 for further gas-liquid separation, and then the gaseous refrigerant is discharged from the second accumulator 14 into the second cylinder 12 for compression.

The intermediate pressure liquid refrigerant discharged from the first port f of the gas-liquid separator 5 is depressurized by the secondary throttling of the first throttling element 6 and discharged into the outdoor heat exchanger 3 for heat exchange from the outdoor heat exchanger. The discharged refrigerant is discharged into the first accumulator 13 through the second port C and the fourth port S, and the refrigerant discharged from the first accumulator 13 is discharged into the first cylinder 11 for compression.

It can be seen that, when the cold and warm air conditioner 100 is in operation, the refrigerants of different pressure states enter the first cylinder 11 and the second cylinder 12, respectively, and the first cylinder 11 and the second cylinder 12 independently complete the compression process from the first cylinder. The discharged compressed refrigerant 11 and the compressed refrigerant discharged from the second cylinder 12 are discharged into the casing 10 and discharged from the exhaust port 15, while the exhaust volume ratio of the second cylinder 12 and the first cylinder 11 is exceeded. The value ranges from 1% to 10%, and the refrigerant having a small flow rate and a high pressure state is discharged into the second cylinder 12 having a small exhaust volume for compression, thereby improving energy. Efficiency, energy saving and emission reduction.

At the same time, by providing the gas-liquid separator 5 between the outdoor heat exchanger 3 and the indoor heat exchanger 4, the gas-liquid separator 5 separates a part of the gaseous refrigerant and then discharges it back into the second cylinder 12 for compression. The gas content in the refrigerant flowing into the indoor heat exchanger 4 during cooling is reduced, and the gas content flowing into the refrigerant of the outdoor heat exchanger 3 during heating is reduced, and the gaseous refrigerant is reduced to the indoor heat exchanger as the evaporator. 4 or the influence of the heat exchange performance of the outdoor heat exchanger 3, thereby improving the heat exchange efficiency and reducing the compression power consumption of the compressor.

Further, since the second accumulator 14 is provided, the refrigerant discharged from the gas-liquid separator 5 can be further subjected to gas-liquid separation, and the liquid refrigerant can be further prevented from returning to the second cylinder 12, thereby preventing the twin-cylinder compressor 1 from occurring. The liquid hammer phenomenon improves the service life of the twin-cylinder compressor 1.

According to the cold and warm air conditioner 100 of the embodiment of the present invention, by providing the above-described two-cylinder compressor 1, the energy efficiency of the air conditioner can be effectively improved, energy saving and emission reduction can be effectively promoted, and the heat exchange efficiency can be improved and the heat exchange efficiency can be reduced by providing the gas-liquid separator 5. The compression power consumption of the compressor further improves the capacity and energy efficiency of the air conditioner, and the life of the two-cylinder compressor can be extended by providing the second accumulator 14.

As shown in FIG. 2, in some embodiments of the present invention, a solenoid valve 20 is connected in series between the gas outlet m and the second accumulator 14, whereby when the liquid refrigerant in the gas-liquid separator 5 exceeds a safe level By closing the solenoid valve 20, liquid refrigerant can be prevented from entering the second cylinder 12, thereby avoiding liquid hammering of the twin-cylinder compressor 1 and prolonging the service life of the twin-cylinder compressor 1. Further, a liquid level sensor may be provided on the gas-liquid separator 5, and the opening and closing state of the electromagnetic valve 20 may be controlled by the detection result of the liquid level sensor.

In some embodiments of the invention, the volume of the gas-liquid separator 5 ranges from 100 mL to 500 mL.

In some embodiments of the invention, the volume of the first reservoir 13 is greater than the volume of the second reservoir 14. Thereby, the cost can be reduced by making the volume of the second accumulator 14 small while ensuring the amount of compression of the second cylinder 12. Preferably, the volume of the second reservoir 14 is no more than one-half the volume of the first reservoir 13.

The inventors have the energy efficiency of the cold and warm type air conditioner according to the above embodiment of the present invention (setting the rated cooling capacity to be 3.5 kw and setting the exhaust volume ratio of the second cylinder and the first cylinder to 7.6%) under different working conditions. Comparing with the energy efficiency of the existing cold and warm air conditioner under the same working conditions, the following data are obtained:

测试工况Test condition	现有技术方案能效Prior art solutions	本发明技术方案能效Energy efficiency of the technical solution of the present invention	提升比例Promotion ratio
额定制冷Rated cooling	3.933.93	4.264.26	8.40％8.40%
中间制冷Intermediate refrigeration	5.885.88	6.186.18	5.10％5.10%
额定制热Rated heating	3.643.64	3.913.91	7.42％7.42%
中间制热Intermediate heating	5.555.55	5.895.89	6.13％6.13%
低温制热Low temperature heating	2.572.57	2.732.73	6.23％6.23%
APFAPF	4.614.61	4.924.92	6.72％6.72%

It can be seen that the air-conditioning type air conditioner according to the embodiment of the present invention has a significant improvement in energy efficiency and annual energy efficiency APF compared with the existing air-cooling type compressor.

At the same time, the inventors compared the cold and warm air conditioners of the embodiments of the present invention with different rated cooling capacities and different exhaust volume ratios with the existing cold and warm air conditioners under the same working conditions, and found that the energy efficiency is improved, for example, the inventors passed The test found that the cold and warm air conditioner according to the embodiment of the present invention (sets the rated cooling capacity to 2.6 kW, and sets the exhaust volume ratio of the second cylinder and the first cylinder to 9.2%) and the existing cold and warm under the same working condition. Compared with the type of air conditioner, the energy efficiency increased by 7.3%.

A single-cooling type air conditioner 100 according to an embodiment of the present invention will be described in detail below with reference to FIGS. 3 to 5, in which the single-cooling type air conditioner 100 has a cooling mode.

As shown in FIG. 3 to FIG. 5, a single-cooling type air conditioner 100 according to an embodiment of the present invention includes: a two-cylinder compressor 1, an outdoor heat exchanger 3, an indoor heat exchanger 4, a gas-liquid separator 5, and a first The throttle element 6 and the second throttle element 7. The two-cylinder compressor 1 includes a casing 10, a first cylinder 11, a second cylinder 12, a first accumulator 13 and a second accumulator 14, and the casing 10 is provided with an exhaust port 15, a first cylinder 11 And the second cylinder 12 is respectively disposed in the casing 10, and the first accumulator 13 and the second accumulator 14 are disposed outside the casing 10, and the intake port of the first cylinder 11 is in communication with the first accumulator 13, The intake port of the second cylinder 12 is in communication with the second accumulator 14. That is, the first cylinder 11 and the second cylinder 12 perform an independent compression process, and the gas refrigerant separated from the first accumulator 13 is discharged into the first cylinder 11 for compression, and is separated from the second accumulator 14. The gas refrigerant is discharged into the second cylinder 12 for compression, and the compressed refrigerant discharged from the first cylinder 11 and the compressed refrigerant discharged from the second cylinder 12 are discharged into the casing 10 and then from the exhaust port. 15 discharge.

The first end of the outdoor heat exchanger 3 is connected to the exhaust port 15, and the first end of the indoor heat exchanger 4 is connected to the first accumulator 13. The gas-liquid separator 5 includes a gas outlet m, a first interface f and a second interface g, the gas outlet m is connected to the second reservoir 14, the first interface f is connected to the second end of the outdoor heat exchanger 3, and the second The interface g is connected to the second end of the indoor heat exchanger 4, the first throttle element 6 is connected in series between the first interface f and the outdoor heat exchanger 3, and the second interface g and the indoor heat exchanger 4 are connected in series. Two throttle elements 7. In some examples of the invention, the opening degrees of the first throttle element 6 and the second throttle element 7 are both adjustable, optionally, the first throttle element 6 is an electronic expansion valve, and the second throttle element 7 is The electronic expansion valve, of course, can be understood that the first throttle element 6 and the second throttle element 7 can also be other adjustable opening elements such as thermal expansion valves.

In other examples of the invention, the opening of the first throttle element 6 is adjustable and the opening of the second throttle element 7 is fixed, optionally the first throttle element 6 is an electronic expansion valve, the second section The flow element 7 is a capillary or a throttle valve, of course It is understood that the first throttle element 6 can also be other adjustable opening elements such as a thermal expansion valve.

When the single-cooling type air conditioner 100 is cooled, the high-temperature high-pressure refrigerant discharged from the exhaust port 15 of the two-cylinder compressor 1 is discharged into the outdoor heat exchanger 3 to perform condensation heat dissipation, and the high-pressure liquid refrigerant discharged from the outdoor heat exchanger 3 is discharged. After the first throttling element 6 is throttled down by the first throttling element 6, it is discharged from the first interface f into the gas-liquid separator 5 for gas-liquid separation, and the separated intermediate pressure gaseous refrigerant is discharged from the gas outlet m to the second. Further gas-liquid separation is performed in the accumulator 14, and then the gaseous refrigerant is discharged from the second accumulator 14 into the second cylinder 12 for compression.

The intermediate pressure liquid refrigerant discharged from the second port g of the gas-liquid separator 5 is depressurized by the secondary throttling of the second throttling element 7 and then discharged into the indoor heat exchanger 4 for heat exchange to reduce the indoor ambient temperature. The refrigerant discharged from the indoor heat exchanger 4 is discharged into the first accumulator 13, and the refrigerant discharged from the first accumulator 13 is discharged into the first cylinder 11 to be compressed.

It can be seen that, when the single-cooling type air conditioner 100 is in operation, the refrigerants of different pressure states enter the first cylinder 11 and the second cylinder 12, respectively, and the first cylinder 11 and the second cylinder 12 independently complete the compression process, from the first The compressed refrigerant discharged from the cylinder 11 and the compressed refrigerant discharged from the second cylinder 12 are discharged into the casing 10 and discharged from the exhaust port 15 while being exhausted by the second cylinder 12 and the first cylinder 11 The ratio of the ratio is from 1% to 10%, and the refrigerant having a small flow rate and a high pressure state is discharged into the second cylinder 12 having a small exhaust volume for compression, thereby improving energy efficiency, energy saving and emission reduction.

At the same time, by providing the gas-liquid separator 5 between the outdoor heat exchanger 3 and the indoor heat exchanger 4, the gas-liquid separator 5 separates a part of the gaseous refrigerant and then discharges it back into the second cylinder 12 for compression. The gas content in the refrigerant flowing into the indoor heat exchanger 4 during cooling is reduced, and the influence of the gaseous refrigerant on the heat exchange performance of the indoor heat exchanger 4 as an evaporator is reduced, thereby improving heat exchange efficiency and reducing compressor compression. Power consumption.

According to the single-cooling type air conditioner 100 according to the embodiment of the present invention, by providing the above-described two-cylinder compressor 1, the energy efficiency of the air conditioner can be effectively improved, energy saving and emission reduction can be effectively promoted, and the heat exchange efficiency can be improved by providing the gas-liquid separator 5. The compression power consumption of the compressor is reduced, the capacity and energy efficiency of the air conditioner are further improved, and the service life of the two-cylinder compressor can be extended by providing the second liquid storage device 14.

As shown in FIG. 4, in some embodiments of the present invention, electromagnetic is connected in series between the gas outlet m and the second accumulator 14. The valve 20, thereby preventing the liquid refrigerant from entering the second cylinder 12 by closing the solenoid valve 20 when the liquid refrigerant in the gas-liquid separator 5 exceeds the safe liquid level, thereby preventing the liquidostatic operation of the twin-cylinder compressor 1 from occurring. Extend the service life of the twin-cylinder compressor 1. Further, a liquid level sensor may be provided on the gas-liquid separator 5, and the opening and closing state of the electromagnetic valve 20 may be controlled by the detection result of the liquid level sensor.

The inventors will use a single-cooling type air conditioner according to the above embodiment of the present invention (set the rated cooling capacity to be 3.5 kw, and set the exhaust volume ratio of the second cylinder and the first cylinder to 7.6%) under different operating conditions. The energy efficiency is compared with the energy efficiency of the existing single-cooled air conditioner under the same working conditions, and the following data are obtained:

测试工况Test condition	现有技术方案能效Prior art solutions	本发明技术方案能效Energy efficiency of the technical solution of the present invention	提升比例Promotion ratio
额定制冷Rated cooling	3.933.93	4.264.26	8.40％8.40%
中间制冷Intermediate refrigeration	5.885.88	6.186.18	5.10％5.10%
APFAPF	4.614.61	4.924.92	6.72％6.72%

It can be seen that the single-cooling type air conditioner according to the embodiment of the present invention has a significant improvement in energy efficiency and annual energy efficiency APF compared with the existing single-cooling type compressor.

At the same time, the inventors compared the single-cooling type air conditioner of the embodiment of the present invention with different rated cooling capacity and different exhaust volume ratios with the existing single-cooling type air conditioner under the same working condition, and found that the energy efficiency is improved, for example, the invention A person has found through experiments that the single-cooling type air conditioner of the embodiment of the present invention (sets the rated cooling capacity to 2.6 kW, and sets the exhaust volume ratio of the second cylinder and the first cylinder to 9.2%) to the same working condition as the existing one. Compared with the single-cooled air conditioner, the energy efficiency increased by 7.3%.

A control method of an air conditioner according to an embodiment of the present invention, in which the air conditioner is a cold and warm type air conditioner according to the above embodiment of the present invention, will be described in detail with reference to FIGS. 1 to 2, 6, and 7. The opening of the first throttle element and the second throttle element are both adjustable.

When the air conditioner is in operation, the throttling element located upstream of the first throttling element and the second throttling element is a primary throttling element, and the throttling element located downstream of the first throttling element and the second throttling element is two The throttling element, in other words, during cooling, the first throttling element is a primary throttling element and the second throttling element is a secondary throttling element. During heating, the second throttle element is a primary throttling element and the first throttling element is a secondary throttling element.

The control method according to the embodiment of the present invention includes the following steps: first, adjusting the opening degree of the primary throttling element according to the detection result of the first detection object, and then adjusting the opening of the secondary throttling element according to the detection result of the second detection object. Degree, the setting opening degree of the primary throttling element is smaller than the set opening degree of the secondary throttling element, the detection result of the first detection object and the second The detection result of the detection object is different. It should be noted that the difference between the detection result of the first detection object and the detection result of the second detection object means that the primary throttle element and the secondary throttle element cannot simultaneously use the same state parameter for adjustment control, in other words, for The required relevant parameters for adjusting the primary throttling element are different from the relevant parameters required for adjusting the secondary throttling element.

The first detection object includes an outdoor ambient temperature, an operating frequency of the two-cylinder compressor, an exhaust temperature of the exhaust port, an exhaust pressure of the exhaust port, an intermediate pressure of the refrigerant discharged from the gas outlet, and a refrigerant discharged from the gas outlet. At least one of the intermediate temperatures. The second detection object includes an outdoor ambient temperature, an operating frequency of the two-cylinder compressor, an exhaust temperature of the exhaust port, an exhaust pressure of the exhaust port, an intermediate pressure of the refrigerant discharged from the gas outlet, and a refrigerant discharged from the gas outlet. At least one of the intermediate temperatures.

That is to say, as shown in FIG. 6 and FIG. 7, whether the cooling or the heating is performed, the parameters required for controlling the primary throttle element and the secondary throttle element are collected and processed during the operation of the air conditioner, and then according to the obtained parameters. The opening of the first-stage throttling element is first adjusted until the opening degree is set, and then the opening degree of the two-stage throttling element is adjusted until the opening degree is set, when the primary throttling element and the secondary throttling element are adjusted to When the opening degree is set, the opening degree of the primary throttling element is smaller than the opening degree of the secondary throttling element. It can of course be understood that the steps of collecting and processing the parameters required for controlling the primary throttling element and the steps of collecting and processing the parameters required for controlling the secondary throttling element may be performed simultaneously or sequentially.

After the opening of the primary throttling element and the opening of the secondary throttling element satisfy the condition, the first detection object and the second detection object may be re-detected after n seconds of operation, and then the first stage is adjusted according to the detection result. The opening of the flow element and the secondary throttle element is repeated as such. Of course, the repetition condition is not limited thereto. For example, after receiving the operation instruction of the user, the first detection object and the second detection object may be re-detected, and then the opening degrees of the primary throttle element and the secondary throttle element are adjusted according to the detection result. In other words, in the case of cooling or heating, after the opening of the primary throttle element and the secondary throttle element satisfy the condition, the first throttle element can be operated after n seconds of operation or after receiving the user's operation signal. The relevant parameters of the opening degree of the second throttle element are re-detected, and then the opening degrees of the first throttle element and the second throttle element are adjusted according to the determination result, and thus repeated.

According to the control method of the air conditioner according to the embodiment of the present invention, the energy efficiency of the system is optimized by first adjusting the opening degree of the primary throttling element and then adjusting the opening degree of the secondary throttling element.

A control method according to several embodiments of the present invention is described below, in which the opening degrees of the first throttle element and the second throttle element are both adjustable.

Example 1:

In this embodiment, the first detection object and the second detection object are both the outdoor ambient temperature T4 and the operating frequency F, and the primary throttling element and the secondary throttling are calculated according to the detected outdoor ambient temperature T4 and the operating frequency F. The component is set to the opening degree, and then the opening degree of the corresponding primary throttling element and the secondary throttling element is adjusted according to the set opening degree.

It can be understood that the calculation formula is pre-set in the electronic control component of the air conditioner, and the calculation formula can be based on the actual situation. Specifically limited.

Specifically, when cooling, the relationship between the opening degree LA_cool_1 of the first throttle element and the outdoor ambient temperature T4 and the operating frequency F is: LA_cool_1=a ₁ ·F+b ₁ T ₄ +c ₁ , when calculating When the degree LA_cool_1 is greater than the actual opening degree of the collected first throttling element, the opening degree of the first throttling element is increased to the calculated opening degree; otherwise, the closing is small.

The relationship between the opening degree LA_cool_2 of the second throttle element and the outdoor ambient temperature T4 and the operating frequency F is: LA_cool_2=a ₂ ·F+b ₂ T ₄ +c ₂ , when the calculated opening degree LA_cool_2 is larger than the collected When the actual opening degree of the two throttling elements is increased, the opening degree of the second throttling element is increased to the calculated opening degree; otherwise, the closing is small. _{_{Wherein, 0≤a 1 ≤20,0≤b 1 ≤20, -50≤c}} 1 ≤100; 0≤a 2 ≤30,0≤b 2 ≤30, -50≤c 2 ≤150 control coefficients a, b Both c and c can be 0. When any one of the coefficients is zero, it is proved that the parameter corresponding to the coefficient has no influence on the opening of the throttle element.

When heating, the relationship between the opening degree LA_heat_1 of the second throttle element and the outdoor ambient temperature T4 and the operating frequency F is: LA_heat_1=x ₁ ·F+y ₁ T ₄ +z ₁ , when the calculated opening degree LA_heat_1 When the actual opening degree of the collected second throttle element is greater than the calculated opening degree of the second throttle element;

The relationship between the opening degree LA_heat_2 of the first throttle element and the outdoor ambient temperature T4 and the operating frequency F is: LA_heat_2=x ₂ ·F+y ₂ T ₄ +z ₂ , when the calculated opening degree LA_heat_2 is larger than the collected When the actual opening of the flow element is increased, the opening of the first throttle element is increased to the calculated opening degree; otherwise, the opening is small. _{_{Wherein, 0≤x 1 ≤15,0≤y 1 ≤15, -50≤z}} 1 ≤100; 0≤x 2 ≤25,0≤y 2 ≤25, -50≤z 2 ≤150 control coefficients x, y Both z and z can be 0. When any one of the coefficients is zero, it is proved that the parameter corresponding to the coefficient has no influence on the opening of the throttle element.

For example, during cooling, the outdoor ambient temperature is detected to be 35 ° C, the compressor operating frequency is 58 Hz, a ₁ =1 is set, b ₁ = 1.6, c ₁ = 6; a ₂ = 1.5, b ₂ = 1.6, c ₂ =17. Firstly, according to the collected frequency and the T4 value, the system calculates that the opening degree of the first throttle element should be 120, adjusts the opening degree of the first throttle element to 120; and then calculates the opening degree of the second throttle element to be 160. , adjust the opening of the second throttle element to 160. After maintaining the opening of the two throttling elements for 200s, the compressor operating frequency and the T4 value are re-detected; or the compressor operating frequency and the T4 value are detected according to the adjustment of the air conditioner by the user, for the first throttling element and the second throttling The component is re-adjusted.

According to this adjustment method, the energy efficiency of the air conditioner is 6.5% higher than that of the air conditioner of the same specification on the market.

During heating, the outdoor ambient temperature was detected to be 7 ° C, the compressor operating frequency was 72 Hz, and x ₁ = 2.0, y ₁ = 3.0, z ₁ = 22.0; x ₂ =1, y ₂ = 3.0, z ₂ =7.0. Firstly, according to the collected frequency and the T4 value, the system calculates that the opening degree of the second throttle element should be 187, adjusts the opening degree of the second throttle element to 187; and then calculates the opening degree of the first throttle element to be 100. , adjust the opening of the first throttle element to 100. After maintaining the opening degree of the two throttling elements for 200s, the compressor operating frequency and the T4 value are re-detected, or the compressor operating frequency and the T4 value are detected according to the user's adjustment of the air conditioner, and the first throttling element and the second throttling are performed. The component is re-adjusted.

Example 2:

In this embodiment, the first detection object is the outdoor ambient temperature T4 and the operating frequency F. First, the set opening degree of the primary throttle element is calculated according to the outdoor ambient temperature T4 and the operating frequency F, and then adjusted according to the set opening degree. The opening of the primary throttling element;

The second detection object is the outdoor ambient temperature T4, the operating frequency F and the exhaust pressure; or the second detection object is the outdoor ambient temperature T4, the operating frequency F and the exhaust temperature, first calculated according to the outdoor ambient temperature T4 and the operating frequency F. The exhaust pressure is set or the exhaust temperature is set, and then the opening of the secondary throttle element is adjusted according to the actually detected exhaust pressure or exhaust temperature so that the detected exhaust pressure or exhaust temperature reaches the set exhaust Pressure or set the exhaust temperature.

When the second detection object includes the exhaust gas temperature, the relationship between the exhaust gas temperature TP and the outdoor ambient temperature T4 and the operating frequency F is: TP_cool=a ₂ ·F+b ₂ T ₄ +c ₂ , when the second detection When the object includes the exhaust pressure, the relationship between the exhaust pressure P row and the outdoor ambient temperature T4 and the operating frequency F is: P row _cool = a ₃ · F + b ₃ T ₄ + c ₃ , when collected When the exhaust gas temperature or the exhaust gas pressure is greater than the calculated set exhaust gas temperature or the exhaust gas pressure is set, the opening degree of the second throttle element is opened; Wherein _{_{_{0≤a 1 ≤20,0≤b 1 ≤20, -50≤c 1}}} ≤100,0≤a 2 ≤30,0≤b 2 ≤30, -50≤c 2 ≤150,0≤a 3 ≤ 30,0≤b _₃ ≤30, -50≤c ₃ ≤150. The control coefficients a, b, and c can both be 0. When any one of the coefficients is zero, it is proved that the parameter corresponding to the coefficient has no influence on the opening of the throttle element.

When heating, the relationship between the opening degree LA_heat_1 of the second throttle element and the outdoor ambient temperature T4 and the operating frequency F is: LA_heat_1=x ₁ ·F+y ₁ T ₄ +z ₁ , when the calculated opening degree LA_heat_1 When the actual opening degree of the second throttle element is greater than the acquired opening degree, the opening degree of the second throttle element is increased to calculate the opening degree;

When the second detection object includes the exhaust gas temperature, the relationship between the exhaust gas temperature TP and the outdoor ambient temperature T4 and the operating frequency F is: TP_heat=x ₂ ·F+y ₂ T ₄ +z ₂ , when the second detection When the object includes the exhaust pressure, the relationship between the discharge pressure P row and the outdoor ambient temperature T4 and the operating frequency F is: P row _heat=x ₃ ·F+y ₃ T ₄ +z ₃ , when collected When the exhaust gas temperature or the exhaust gas pressure is greater than the calculated set exhaust gas temperature or the exhaust gas pressure is set, the opening degree of the first throttling element is opened; otherwise, the opening is small. Wherein _{_{_{0≤x 1 ≤15,0≤y 1 ≤15, -50≤z 1}}} ≤100,0≤x 2 ≤25,0≤y 2 ≤25, -50≤z 2 ≤150,0≤x 3 ≤ 25,0≤y _₃ ≤25, -50≤z ₃ ≤150. The control coefficients x, y, and z can both be 0. When any one of the coefficients is zero, it is proved that the parameter corresponding to the coefficient has no influence on the opening of the throttle element.

For example, during cooling, the outdoor ambient temperature is detected to be 35 ° C, the compressor operating frequency is 58 Hz, a ₁ =1 is set, b ₁ = 1.6, c ₁ = 6; a ₂ = 0.5, b ₂ = 0.4, c ₂ =31; a ₃ = 0.25, b ₃ = 0.2, c ₂ = 3.9. Firstly, according to the collected frequency and T4 value, the system calculates that the opening degree of the first throttling element should be 120, adjusts the opening degree of the first throttling element to 120, and then the system calculates according to the adopted frequency and the T4 value. The second throttle element corresponds to an exhaust gas temperature TP_cool of 74 ° C or an exhaust pressure P row _cool of 2.54 MPa, at which time the second throttle element is adjusted according to the detected exhaust gas temperature TP or the exhaust pressure P row. Degree, when the detected exhaust gas temperature is greater than 74 ° C (or the detected exhaust pressure P row is greater than 2.54 MPa), gradually increase the opening of the second throttle element (can be adjusted 4 steps per adjustment). After maintaining the opening degree of the two throttling elements for 200s, the compressor operating frequency and the T4 value are re-detected, or the compressor operating frequency and the T4 value are detected according to the user's adjustment of the air conditioner, and the first throttling element and the second throttling are performed. The component is re-adjusted.

When heating, when the outdoor ambient temperature is 7 °C, the compressor operating frequency is 72 Hz, setting x ₁ =2.0, y ₁ =3.0, z ₁ =22.0; x ₂ =0.5, y ₂ =0.4, z ₂ =30; x ₃ = 0.25, y ₃ = 0.2, z ₃ = 5. Firstly, according to the collected frequency and T4 value, the system calculates that the opening degree of the second throttling element should be 187, adjusts the opening degree of the second throttling element to 187, and then the system calculates according to the adopted frequency and the T4 value. The exhaust gas temperature TP_heat corresponding to the first throttle element is 68.8 ° C, and the exhaust pressure P row _heat is 2.44 MPa. At this time, the opening degree of the first throttle element is adjusted according to the detected exhaust gas temperature TP or the exhaust pressure P, when the detected exhaust gas temperature is greater than 68.8 ° C (or the detected exhaust pressure P row is greater than 2.44 Mpa) , gradually increase the opening degree of the first throttle element (can be adjusted by 4 steps each time), and gradually reduce the opening degree of the first throttle element. After maintaining the opening degree of the two throttling elements for 200s, the compressor operating frequency and the T4 value are re-detected, or the compressor operating frequency and the T4 value are detected according to the user's adjustment of the air conditioner, and the first throttling element and the second throttling are performed. The component is re-adjusted.

Example 3:

In this embodiment, a plurality of outdoor temperature intervals are preset, each outdoor temperature interval corresponds to an opening degree of a different throttling element, and the first detection object is an outdoor ambient temperature T4, according to the actually detected outdoor ambient temperature T4. Outdoor temperature The opening value corresponding to the degree interval adjusts the opening degree of the primary throttling element;

The second detection object is the outdoor ambient temperature T4, the operating frequency F and the exhaust pressure; or the second detection object is the outdoor ambient temperature T4, the operating frequency F and the exhaust temperature, first calculated according to the outdoor ambient temperature T4 and the operating frequency F. Setting the exhaust pressure or setting the exhaust temperature, and then adjusting the opening degree of the secondary throttle element according to the actual detected exhaust pressure or exhaust temperature so that the exhaust pressure or the exhaust temperature is detected to reach the set exhaust pressure or Set the exhaust temperature.

Specifically, when cooling, the specific conditions of the opening of the first throttle element corresponding to different outdoor temperature intervals are as follows:

T4 T4		开度Opening degree
10≤T4＜2010≤T4<20	100100
20≤T4＜3020≤T4<30	110110
30≤T4＜4030≤T4<40	120120
40≤T4＜5040≤T4<50	150150
50≤T4＜6050≤T4<60	180180

When the second detection object includes the exhaust gas temperature, the relationship between the exhaust gas temperature TP and the outdoor ambient temperature T4 and the operating frequency F is: TP_cool=a ₁ ·F+b ₁ T ₄ +c ₁ , when the second detection When the object includes the exhaust pressure, the relationship between the exhaust pressure P row and the outdoor ambient temperature T4 and the operating frequency F is: P row _cool = a ₂ · F + b ₂ T ₄ + c ₂ , when collected When the exhaust gas temperature or the exhaust gas pressure is greater than the calculated set exhaust gas temperature or the exhaust gas pressure is set, the opening degree of the second throttle element is opened; Wherein _{_{_{0≤a 1 ≤20,0≤b 1 ≤20, -50≤c 1}}} ≤100,0≤a 2 ≤30,0≤b 2 ≤30, -50≤c 2 ≤150. The control coefficients a, b, and c can both be 0. When any one of the coefficients is zero, it is proved that the parameter corresponding to the coefficient has no influence on the opening of the throttle element.

When heating, the specific conditions of the opening of the second throttle element corresponding to different outdoor temperature intervals are as follows:

T4 T4		开度Opening degree
10≤T4＜2010≤T4<20	160160
5≤T4＜105≤T4<10	180180
-5≤T4＜5-5≤T4<5	200200
-10≤T4＜-5-10≤T4<-5	250250
-15≤T4＜-10-15≤T4<-10	300300

When the second detection object includes the exhaust gas temperature, the relationship between the exhaust gas temperature TP and the outdoor ambient temperature T4 and the operating frequency F is: TP_heat=x ₁ ·F+y ₁ T ₄ +z ₁ , when the second detection When the object includes the exhaust pressure, the relationship between the discharge pressure P row and the outdoor ambient temperature T4 and the operating frequency F is: P row _heat=x ₂ ·F+y ₂ T ₄ +z ₂ , when collected When the exhaust gas temperature or the exhaust gas pressure is greater than the calculated set exhaust gas temperature or the exhaust gas pressure is set, the opening degree of the first throttling element is opened; otherwise, the opening is small. Wherein _{_{_{0≤x 1 ≤25,0≤y 1 ≤25, -50≤z 1}}} ≤150,0≤x 2 ≤25,0≤y 2 ≤25, -50≤z 2 ≤150. The control coefficients x, y, and z can both be 0. When any one of the coefficients is zero, it is proved that the parameter corresponding to the coefficient has no influence on the opening of the throttle element.

For example, when cooling, the outdoor ambient temperature is 35 ° C, the compressor operating frequency is 58 Hz, a ₁ = 0.5, b ₁ = 0.4, c ₁ = 31, a ₂ = 0.25, b ₂ = 0.2, c ₂ = 3.9. . Firstly, according to the collected outdoor ambient temperature T4, the system firstly calculates that the opening of the first throttling element should be 120, and adjusts the opening degree of the first throttling element to 120; then the system calculates the second throttling according to the frequency and the T4 value. The exhaust gas temperature TP_cool corresponding to the component is 74 ° C or the exhaust pressure P row _cool is 2.54 MPa, at which time the opening degree of the second throttle element is adjusted according to the detected exhaust gas temperature TP or the exhaust pressure P, for example, when detecting When the exhaust gas temperature is greater than 74 ° C (or the detected exhaust pressure P row is greater than 2.54 MPa), the opening of the second throttle element is gradually increased (4 steps can be adjusted each time). After maintaining the opening degree of the two throttling elements for 200s, the compressor operating frequency and the T4 value are re-detected, or the compressor operating frequency and the T4 value are detected according to the user's adjustment of the air conditioner, and the first throttling element and the second throttling are performed. The component is re-adjusted.

When heating, the outdoor ambient temperature is detected to be 7 ° C, the compressor operating frequency is 72 Hz, set x ₁ = 0.5, y ₁ = 0.4, z ₁ = 30; x ₂ = 0.25, y ₂ = 2, z ₂ = 5. Firstly, according to the collected outdoor ambient temperature T4, the system determines that the opening of the second throttling element should be 180, and adjusts the opening degree of the second throttling element to 180; then the system calculates according to the adopted frequency and the T4 value. The exhaust gas temperature TP_heat corresponding to the first throttle element is 68.8 ° C, and the exhaust pressure P row _heat is 3.7 MPa. At this time, the opening degree of the first throttle element is adjusted according to the detected exhaust gas temperature TP or the exhaust pressure P, when the detected exhaust gas temperature is greater than 68.8 ° C (or the detected exhaust pressure P row is greater than 3.7 Mpa) , gradually increase the opening degree of the first throttle element (can be adjusted by 4 steps each time), and gradually reduce the opening degree of the first throttle element. After maintaining the opening degree of the two throttling elements for 200s, the compressor operating frequency and the T4 value are re-detected, or the compressor operating frequency and the T4 value are detected according to the user's adjustment of the air conditioner, and the first throttling element and the second throttling are performed. The component is re-adjusted.

Example 4:

In this embodiment, the intermediate temperature or the intermediate pressure is preset, and the first detection object is an intermediate pressure or an intermediate temperature, and the opening degree of the primary throttle element is adjusted according to the actually detected intermediate pressure or intermediate temperature to make the detected intermediate The pressure or intermediate temperature reaches a preset intermediate pressure or a preset intermediate temperature.

The second detection object is the outdoor ambient temperature T4, the operating frequency F and the exhaust pressure; or the second detection object is the outdoor ambient temperature T4, the operating frequency F and the exhaust temperature, first calculated according to the outdoor ambient temperature T4 and the operating frequency F. Set the exhaust pressure or set the exhaust temperature, and then adjust the secondary section according to the actual detected exhaust pressure or exhaust temperature. The opening of the flow element is such that the detected exhaust pressure or exhaust temperature reaches a set exhaust pressure or sets an exhaust temperature.

Specifically, during cooling, the preset intermediate temperature may range from 20 ° C to 35 ° C, and the preset intermediate pressure may range from 0.8 MPa to 2.0 MPa. When the intermediate pressure is detected or the intermediate temperature is lower than the set value, the opening degree of the first throttling element is opened, and vice versa.

When heating, the preset intermediate temperature may range from 20 ° C to 30 ° C, and the preset intermediate pressure may range from 1.0 MPa to 2.5 MPa. When the intermediate pressure is detected or the intermediate temperature is higher than the set value, the opening degree of the second throttle element is opened, and vice versa.

For example, when cooling, set the intermediate temperature to 26 ° C or set the intermediate pressure to 1.65 MPa, detect the outdoor ambient temperature is 35 ° C, the compressor operating frequency is 58 Hz, set a ₁ = 0.5, b ₁ = 0.4, c ₁ = 31; a ₂ = 0.25, b ₂ = 0.2, and c ₂ = 3.9. First, the system adjusts the opening of the first throttle element based on the collected intermediate temperature or intermediate pressure value. When the collected intermediate temperature is greater than 26 ° C or the collected intermediate pressure is greater than 1.65 MPa, the opening of the first throttling element is gradually reduced (4 steps can be adjusted each time). On the contrary, adjust the opening degree. Then, based on the frequency and the T4 value, the system calculates that the exhaust gas temperature TP_cool corresponding to the second throttle element is 74 ° C or the exhaust pressure P row _cool is 2.54 MPa, according to the detected exhaust gas temperature TP or exhaust pressure. P adjusts the opening degree of the second throttle element, and when detecting that the exhaust gas temperature is greater than 74 ° C (or the detected pressure P row is greater than 2.54 MPa), gradually increase the opening degree of the second throttle element (can be pressed each time Adjust the 4-step action). After maintaining the opening degree of the two throttling elements for 200s, the compressor operating frequency and the T4 value are re-detected, or the compressor operating frequency and the T4 value are detected according to the user's adjustment of the air conditioner, and the first throttling element and the second throttling are performed. The component is re-adjusted.

When heating, the intermediate temperature is set to 26 ° C, the intermediate pressure is 1.6 MPa, the outdoor ambient temperature is detected to be 7 ° C, the compressor operating frequency is 72 Hz, the setting x ₁ = 0.5, y ₁ = 0.4, z ₁ = 30; x ₂ = 0.25, y ₂ = 2, z ₂ = 5. First, the system adjusts the opening of the second throttle element according to the collected intermediate temperature or intermediate pressure value. When the collected intermediate temperature is greater than 26 ° C or the collected intermediate pressure is greater than 1.6 MPa, the opening of the second throttle element is gradually increased (4 steps can be adjusted each time). On the contrary, adjust the opening degree. Then, based on the detected frequency and the T4 value, the system calculates that the exhaust gas temperature TP_heat corresponding to the first throttle element is 68.8 ° C, and the exhaust pressure P row _heat is 3.7 MPa. At this time, the opening degree of the first throttle element is adjusted according to the detected exhaust gas temperature TP or the exhaust pressure P, when the detected exhaust gas temperature is greater than 68.8 ° C (or the detected exhaust pressure P row is greater than 3.7 Mpa) , gradually increase the opening degree of the first throttle element (can be adjusted by 4 steps each time), and gradually reduce the opening degree of the first throttle element. After maintaining the opening degree of the two throttling elements for 200s, the compressor operating frequency and the T4 value are re-detected, or the compressor operating frequency and the T4 value are detected according to the user's adjustment of the air conditioner, and the first throttling element and the second throttling are performed. The component is re-adjusted.

Example 5:

In this embodiment, the intermediate temperature or the intermediate pressure is preset, and the first detection object is an intermediate pressure or an intermediate temperature, and the opening degree of the primary throttle element is adjusted according to the actually detected intermediate pressure or intermediate temperature to make the detected intermediate The pressure or the intermediate temperature reaches a preset intermediate pressure or a preset intermediate temperature;

The second detection object is an outdoor ambient temperature T4 and an operating frequency F. First, the set opening degree of the secondary throttle element is calculated according to the outdoor ambient temperature T4 and the operating frequency F, and then the secondary throttle element is adjusted according to the set opening degree. Opening degree.

Specifically, the preset intermediate temperature range during cooling may be 20° C.-35° C., and the preset intermediate pressure may range from 0.8 MPa to 1.5 MPa. When the intermediate pressure is detected or the temperature is lower than the set value, the opening degree of the first throttling element is opened, and vice versa.

The relationship between the opening degree LA_cool_2 of the second throttle element and the outdoor ambient temperature T4 and the operating frequency F is: LA_cool_2=a ₂ ·F+b ₂ T ₄ +c ₂ , when the calculated opening degree LA_cool_2 is larger than the collected When the actual opening degree of the two throttling elements is increased, the opening degree of the second throttling element is increased to the calculated opening degree; otherwise, the closing is small. _{_{Wherein, 0≤a 2 ≤30,0≤b 2 ≤30, -50≤c}} 2 ≤150, control coefficients a, b, c may be 0, when any one zero coefficient, this coefficient corresponding to demonstrate The parameters have no effect on the opening of the throttle element.

When heating, the preset intermediate temperature may range from 20 ° C to 30 ° C, and the preset intermediate pressure may range from 1.0 MPa to 2.5 MPa. When the intermediate pressure is detected or the temperature is higher than the set value, the opening degree of the second throttle element is opened, and vice versa.

The relationship between the opening degree LA_heat_2 of the first throttle element and the outdoor ambient temperature T4 and the operating frequency F is: LA_heat_2=x ₂ ·F+y ₂ T ₄ +z ₂ , when the calculated opening degree LA_heat_2 is larger than the collected When the actual opening degree of the flow element is increased, the opening degree of the first throttle element is increased to the calculated opening degree; otherwise, the opening is small. Wherein, 0≤x ₂ ≤25, 0≤y ₂ ≤25, -50≤z ₂ ≤150, the control coefficients x, y, z can both be 0, and when any one of the coefficients is zero, the corresponding coefficient is proved The parameters have no effect on the opening of the throttle element.

For example, when cooling, set the intermediate temperature to 26 ° C or set the intermediate pressure to 1.65 MPa, detect the outdoor ambient temperature is 35 ° C, the compressor operating frequency is 58 Hz, set a ₂ = 1.5, b ₂ = 1.6, c ₂ = 17. First, the system adjusts the opening of the first throttle element based on the collected intermediate temperature or intermediate pressure value. When the collected intermediate temperature is greater than 26 ° C or the collected intermediate pressure is greater than 1.65 MPa, the opening of the first throttling element is gradually reduced (4 steps can be adjusted each time). On the contrary, adjust the opening degree. Then, the system calculates the set opening degree of the second throttle element to 160 according to the detected outdoor ambient temperature and the compressor running frequency, and then adjusts the opening degree of the second throttle element to 160. After maintaining the opening degree of the two throttling elements for 200s, the compressor operating frequency and the T4 value are re-detected, or the compressor operating frequency and the T4 value are detected according to the user's adjustment of the air conditioner, and the first throttling element and the second throttling are performed. The component is re-adjusted.

When heating, the intermediate temperature was set to 26 ° C, the intermediate pressure was 1.6 MPa, the outdoor ambient temperature was detected to be 7 ° C, the compressor operating frequency was 72 Hz, and x ₂ =1, y ₂ = 3.0, and z ₂ = 7.0 were set. First, the system adjusts the opening of the second throttle element according to the collected intermediate temperature or intermediate pressure value. When the detected intermediate temperature is greater than 26 ° C or the detected intermediate pressure is greater than 1.6 MPa, the opening of the second throttle element is gradually increased (4 steps can be adjusted each time). On the contrary, adjust the opening degree. Then, the opening degree of the first throttle element is calculated to be 100, and the opening degree of the first throttle element is adjusted to 100. After maintaining the opening degree of the two throttling elements for 200s, the compressor operating frequency and the T4 value are re-detected, or the compressor operating frequency and the T4 value are detected according to the user's adjustment of the air conditioner, and the first throttling element and the second throttling are performed. The component is re-adjusted.

Example 6

In this embodiment, a plurality of outdoor temperature intervals are preset, each outdoor temperature interval corresponds to an opening degree of a different throttling element, and the first detection object is an outdoor ambient temperature T4, according to the actually detected outdoor ambient temperature T4. Outdoor temperature The opening value corresponding to the degree interval adjusts the opening degree of the primary throttle element.

The relationship between the opening degree LA_heat_2 of the first throttle element and the outdoor ambient temperature T4 and the operating frequency F is: LA_heat_2=x ₂ ·F+y ₂ T ₄ +z ₂ , when the calculated opening degree LA_heat_2 is larger than the collected When the actual opening of the flow element is increased, the opening of the first throttle element is increased to the calculated opening degree; otherwise, the opening is small. Wherein, 0≤x ₂ ≤25, 0≤y ₂ ≤25, -50≤z ₂ ≤150, the control coefficients x, y, z can both be 0, and when any one of the coefficients is zero, the corresponding coefficient is proved The parameters have no effect on the opening of the throttle element.

For example, during cooling, the outdoor ambient temperature is detected to be 35 ° C, the compressor operating frequency is 58 Hz, a ₂ = 1.5, b ₂ = 1.6, and c ₂ = 17. First, firstly, according to the collected outdoor ambient temperature T4, the system firstly calculates that the opening degree of the first throttle element should be 120, and adjusts the opening degree of the first throttle element to 120. Then, the system calculates the set opening degree of the second throttle element to 160 according to the detected outdoor ambient temperature and the compressor running frequency, and then adjusts the opening degree of the second throttle element to 160. After maintaining the opening degree of the two throttling elements for 200s, the compressor operating frequency and the T4 value are re-detected, or the compressor operating frequency and the T4 value are detected according to the user's adjustment of the air conditioner, and the first throttling element and the second throttling are performed. The component is re-adjusted.

When heating, the outdoor ambient temperature was detected to be 7 ° C, the compressor operating frequency was 72 Hz, and x ₂ =1, y ₂ = 3.0, and z ₂ = 7.0 were set. Firstly, according to the collected outdoor ambient temperature T4, the system should obtain that the opening degree of the second throttle element should be 180, and adjust the opening degree of the second throttle element to 180; then calculate the opening degree of the first throttle element as 100. Adjust the opening of the first throttle element to 100. After maintaining the opening degree of the two throttling elements for 200s, the compressor operating frequency and the T4 value are re-detected, or the compressor operating frequency and the T4 value are detected according to the user's adjustment of the air conditioner, and the first throttling element and the second throttling are performed. The component is re-adjusted.

It is to be understood that the above six embodiments are only specific examples. The control method of the embodiment of the present invention is not limited to the above six types, for example, the first-stage throttling element and the two-stage throttling element in the six examples. The adjustment mode of the opening degree is randomly combined; or the operating frequency of the compressor in the above embodiment may also be obtained from the actually detected outdoor environmental temperature, for example, a preset plurality of outdoor environmental temperature intervals, and a plurality of outdoor environmental temperature intervals corresponding to Different compressor operating frequencies.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a control method of an air conditioner according to an embodiment of the present invention will be described in detail with reference to Figs. 1 to 2, Fig. 8, and Fig. 9, wherein the air conditioner is a cold and warm type air conditioner according to the above embodiment of the present invention. The opening of the first throttling element is fixed, and the opening of the second throttling element is adjustable.

A method of controlling an air conditioner according to an embodiment of the present invention includes the step of adjusting an opening degree of a second throttle element to a set opening degree according to a detection result of the first detection object during a cooling operation. During the heating operation, the opening degree of the second throttle element is adjusted to the set opening degree according to the detection result of the second detection object. That is to say, during cooling and heating, the parameters required to control the second throttle element are collected and processed, and then the opening degree of the second throttle element is controlled according to the obtained parameters until the condition is satisfied.

The first detection object includes an outdoor ambient temperature, an operating frequency of the two-cylinder compressor, an exhaust temperature of the exhaust port, an exhaust pressure of the exhaust port, an intermediate pressure of the refrigerant discharged from the gas outlet, and a refrigerant discharged from the gas outlet. At least one of an intermediate temperature, a gas-liquid separator temperature, and a gas-liquid separator pressure.

The second detection object includes an outdoor ambient temperature, an operating frequency of the two-cylinder compressor, an exhaust pressure of the exhaust port, an exhaust temperature of the exhaust port, an intermediate pressure of the refrigerant discharged from the gas outlet, and a refrigerant discharged from the gas outlet. At least one of an intermediate temperature, a gas-liquid separator temperature, and a gas-liquid separator pressure. It can be understood that the first detection object and the second inspection The objects to be measured may be the same or different. It should be noted that the intermediate pressure and the intermediate temperature can be obtained by detecting the refrigerant in the line connecting the gas outlet and the second accumulator.

After the opening degree of the second throttle element satisfies the condition, the first detection object or the second detection object may be re-detected after n seconds of operation, and then the opening degree of the second throttle element is adjusted according to the detection result, and thus repeated. Of course, the repetition condition is not limited thereto. For example, after receiving the operation instruction of the user, the first detection object or the second detection object may be re-detected, and then the opening degree of the second throttle element is adjusted according to the detection result. In other words, in the cooling or heating, after the opening of the second throttle element satisfies the condition, the relevant parameter of the opening degree of the second throttle element can be re-run after n seconds of operation or after receiving the operation signal of the user. The judgment is detected, and then the opening degree of the second throttle element is adjusted according to the determination result, and thus repeated.

According to the control method of the air conditioner according to the embodiment of the invention, the opening degree of the second throttle element can be well controlled to reach the preset opening degree, thereby achieving the best energy saving effect.

The control method according to the embodiment of the present invention is described in detail below by taking six specific embodiments as an example. The opening of the first throttling element is fixed, and the opening degree of the second throttling element is adjustable.

Example 7

In this embodiment, the first detection object and/or the second detection object are the outdoor ambient temperature T4 and the exhaust gas temperature, and the operating frequency F is first obtained according to the detected outdoor ambient temperature T4, and according to the detected outdoor ambient temperature T4. The set exhaust temperature is calculated with the operating frequency F, and then the opening of the second throttle element is adjusted such that the detected exhaust temperature reaches the set exhaust temperature. It can be understood that the calculation formula is pre-set in the electronic control component of the air conditioner, and the calculation formula can be specifically limited according to the actual situation.

Specifically, when the first detection object is the outdoor ambient temperature T4 and the exhaust temperature, the outdoor ambient temperature T4 is detected when the cooling is turned on, the operating frequency F of the compressor is determined according to T4, and the exhaust temperature TP is determined according to T4 and F, Where TP=a1*F+b1+c1*T4, the range of values of a1, b1, and c1 may correspond to the outdoor ambient temperature T4, for example, when 20°C≥T4: a1 takes -10-10; b1 takes -100 -100; c1 takes -10-10; when 20 °C <T4 ≤ 30 °C: a1 takes -8--8; b1 takes -80--80; c1 takes -8-8; when 30 °C <T4 ≤ At 40 ° C: a1 take -9--9; b1 take -90--90; c1 take -6-6; when 40 ° C <T4 ≤ 50 ° C: a1 take -8--8; b1 take -90- -90; c1 takes -5-5; when 50 °C < T4: a1 takes -10--10; b1 takes -100--100; c1 takes -5-5. It is of course understood that the values of a1, b1, and c1 are not limited thereto, and may be, for example, independent of the outdoor ambient temperature T4, but are preset in the system.

It should be noted that when one of a1 and b1 or a value of 0 at the same time, it can be considered that the above formula is independent of the parameter, for example, when a1=0, it is considered to be independent of the frequency F.

The operating opening of the second throttle element is then adjusted according to TP. The second throttle element is adjusted to be in position and stable operation. After n seconds, it is re-detected whether there is a change in the outdoor temperature T4 or whether the user has an operation, and then the opening degree of the second throttle element is adjusted according to the relevant change.

For example, in the startup and cooling operation, the T4 temperature is detected to be 35 ° C. The corresponding compressor operating frequency under the T4 should be 90 HZ, and the exhaust temperature coefficient a1 of the corresponding temperature interval is 0.6, b1 is 20, and c1 is 0.2. The exhaust gas temperature is TP=0.6*90+20+0.2*35=81, and the second throttle element opening is adjusted according to the set exhaust temperature Tp=81°C: the TP detected at the initial opening has reached 90 degrees. Then, the second throttle element is opened to reach the second throttle element opening corresponding to the set exhaust temperature Tp=81° C. that is, the detected exhaust temperature reaches the set exhaust temperature. The second throttling element reaches stable operation after reaching the target opening degree. After n seconds, the T4 was detected to be unchanged and continued to operate stably.

When the second detection object is the outdoor ambient temperature T4 and the exhaust temperature, the outdoor ambient temperature T4 is detected during the heating startup, the operating frequency F of the compressor is determined according to T4, and the exhaust temperature TP is determined according to T4 and F, wherein TP =a2*F+b2+c2*T4; the range of values of a2, b2, and c2 can correspond to the outdoor ambient temperature T4, for example, when 5°C<T4≤15°C: a2 takes -8--8; b2 takes - 80--80; c2 takes -8-8; when 15 °C < T4: a2 takes -9--9; b2 takes -90--90; c2 takes -6-6. It is of course understood that the values of a2, b2, and c2 are not limited thereto, and may be, for example, independent of the outdoor ambient temperature T4, but are preset in the system. It should be noted that when one of a2 and b2 or a value of 0 at the same time, it can be considered that the above formula is independent of the parameter, for example, when a2=0, it is considered to be independent of the frequency F.

The operating opening of the second throttle element is then adjusted according to TP. The second throttle element is adjusted to be in position and stable operation. After n seconds, it is re-detected whether there is a change in the outdoor temperature T4 or whether the user has an operation, and then the second throttle element opening degree is adjusted according to the relevant change.

For example, when the open mechanism is hot running, the T4 temperature is detected to be 7 ° C. The corresponding compressor operating frequency under the T4 should be 75 HZ, and the exhaust temperature coefficient a2 of the corresponding temperature range is 0.4, b2 is 10, and c2 is 5. Exhaust temperature Tp=0.4*75+10+5*7=75, according to the set exhaust temperature Tp=75°C, adjust the opening of the second throttling element: the Tp detected at the initial opening has reached 70°C, Then, the small expansion valve is closed, and the second throttle element opening corresponding to the set exhaust gas temperature Tp=75° C. is reached, that is, the detected exhaust gas temperature reaches the set exhaust gas temperature. The second throttling element reaches stable operation after reaching the target opening degree. After n seconds, the T4 was detected to be unchanged and continued to operate stably.

It should be noted that when the outdoor air temperature T4 is lower than 5 ° C, the air conditioner is prone to frost formation and the exhaust gas temperature is constantly changing. In this case, the air temperature cannot be adjusted according to the exhaust gas temperature.

In this embodiment, the operating frequency of the compressor is determined by the outdoor ambient temperature, for example, a predetermined plurality of outdoor ambient temperature intervals, and the plurality of outdoor ambient temperature intervals respectively correspond to the plurality of compressor operating frequencies, and the detected outdoor ambient temperature is queried. In the outdoor ambient temperature range, the corresponding compressor operating frequency can be obtained. It will of course be understood that the operating frequency of the compressor can also be detected by means of a detection device provided on the compressor.

Example 8

In this embodiment, the first detection object and/or the second detection object are the outdoor ambient temperature T4 and the exhaust pressure, and the operating frequency F is first obtained according to the detected outdoor ambient temperature T4, and according to the detected outdoor ambient temperature T4. The set exhaust pressure is calculated with the operating frequency F, and then the opening of the second throttle element is adjusted such that the detected exhaust pressure reaches the set exhaust pressure.

Specifically, when the first detection object is the outdoor ambient temperature T4 and the exhaust pressure, the outdoor ambient temperature T4 is detected when the cooling is turned on, the operating frequency F of the compressor is determined according to T4, and the exhaust pressure Pp is determined according to T4 and F; Where Pp=a3*F+b3+c3*T4; the range of values of a3, b3, and c3 may correspond to the outdoor ambient temperature T4, for example, when 20 ° C ≥ T4: a3 takes -5 - 5; b3 takes -8 --8; c3 takes -1 -1; when 20 ° C < T4 ≤ 30 ° C: a3 takes -5 - 5; b3 takes -10--10; c3 takes -2 - 2; when 30 ° C < T4 ≤ 40 °C: a3 take -5--5; b3 take -12--12; c3 take -3-3; when 40 °C <T4 ≤ 50 °C: a3 take -6--6; b3 take -15-- 15; c3 takes -4 - 4; when 50 ° C < T4: a3 takes -7--7; b3 takes -20--20; c3 takes -5-5. It is of course understood that the values of a3, b3, and c3 are not limited thereto, and may be, for example, independent of the outdoor ambient temperature T4, but are preset in the system. It should be noted that when one of a3 and b3 or a value of 0 at the same time, it can be considered that the above formula is independent of the parameter, for example, when a3=0, it is considered to be independent of the frequency F.

The operating opening of the second throttle element is then adjusted according to Pp. The second throttle element is adjusted to be in position and stable operation. After n seconds, it is re-detected whether there is a change in the outdoor temperature T4 or whether the user has an operation, and then the second throttle element opening degree is adjusted according to the relevant change.

For example, the startup cooling operation detects that the T4 temperature is 35 °C, and the corresponding compressor operating frequency under the T4 should be 80HZ, and the exhaust pressure coefficient a3 of the corresponding temperature interval is 0.02, b3 is 0.7, and c3 is 0.02, and the exhaust is calculated. The pressure Pp=0.02*80+0.7+0.02*35=3.0, and the opening degree of the second throttle element is adjusted according to the set exhaust pressure Pp=3.0 MPa: when the exhaust pressure Pp is detected to be 2.5 MPa at the initial opening degree, The second throttle element is closed, and the second throttle element opening corresponding to the set exhaust pressure Pp=3.0 MPa is reached, that is, the detected exhaust pressure reaches the set exhaust pressure. The second throttling element reaches stable operation after reaching the target opening degree. After n seconds, the T4 was detected to be unchanged and continued to operate stably.

When the second detection object is the outdoor ambient temperature T4 and the exhaust pressure, the outdoor ambient temperature T4 is detected when the heating is turned on, the operating frequency F of the compressor is determined according to T4, and the exhaust pressure Pp is determined according to T4 and F; wherein Pp =a4*F+b4+c4*T4; the range of values of a4, b4, and c4 can correspond to the outdoor ambient temperature T4, for example, when -15 °C ≥ T4: a4 takes -10--10; b4 takes -8- -8; c4 takes -5-5; when -15 °C <T4 ≤ -5 °C: a4 takes -12-12; b4 takes -10--10; c4 takes -6-6; when -5 °C <T4 ≤ 5 ° C: a4 take -15--15; b4 take -12--12; c4 take -7-7; when 5 ° C <T4 ≤ 15 ° C: a4 take -18--18; b4 take -15 --15; c4 take -8-8; when 15 ° C < T4: a4 take -20--20; b4 take -18--18; c4 take -9-9. It is of course understood that the values of a4, b4, and c4 are not limited thereto, and may be, for example, independent of the outdoor ambient temperature T4, but are preset in the system. It should be noted that when one of a4 and b4 or a value of 0 at the same time, it can be considered that the above formula has nothing to do with the parameter, for example, when a4=0, it is considered Independent of frequency F.

Example 9

In this embodiment, the first detection object and/or the second detection object is the outdoor ambient temperature T4, and the operating frequency F is first obtained according to the detected outdoor ambient temperature T4, and according to the detected outdoor ambient temperature T4 and the operating frequency F. The set opening degree of the second throttle element is calculated, and then the opening degree of the second throttle element is adjusted to the set opening degree.

Specifically, when the first detection object is the outdoor ambient temperature T4, the outdoor ambient temperature T4 is detected at the start of cooling; the compressor operating frequency F is determined according to T4, and the set opening degree Lr of the second throttle element is determined according to T4 and F; The opening degree Lr=a5*F+b5+c5*T4 is set; wherein the range of values of a5, b5, and c5 can correspond to the outdoor ambient temperature T4, for example, preset different outdoor ambient temperature ranges corresponding to different a5, b5 The range of values of c5, and then the values of a5, b5, and c5 can be limited according to actual conditions.

Comparing the difference between the set opening degree Lr of the second throttle element and the initial opening degree of the second throttle element, if it is consistent, there is no adjustment, and if it is inconsistent, it is adjusted to the set opening degree Lr. The second throttle element is adjusted to be in position and stable operation. After n seconds, it is re-detected whether there is a change in the outdoor temperature T4 or whether the user has an operation, and then the second throttle element opening degree is adjusted according to the relevant change.

When the second detection object is the outdoor ambient temperature T4, the outdoor ambient temperature T4 is detected at the start of heating; the compressor operating frequency F is determined according to T4, and the set opening degree Lr of the second throttle element is determined according to T4 and F; The opening degree Lr=a6*F+b6+c6*T4; wherein the range of values of a6, b6, and c6 may correspond to the outdoor ambient temperature T4, for example, when -15 ° C ≥ T4: a6 takes -20--20; B6 takes -200--200; c6 takes -10-10; when -15 °C <T4 ≤ -5 °C: a6 takes -18--18; b6 takes -180--180; c6 takes -9-9; When -5 ° C < T4 ≤ 5 ° C: a6 take -15--15; b6 take -150--150; c6 take -8-8. It is of course understood that the values of a6, b6, and c6 are not limited thereto, and may be, for example, independent of the outdoor ambient temperature T4, but are preset in the system. It should be noted that when one of a6 and b6 or a value of 0 at the same time, it can be considered that the above formula is independent of the parameter, for example, when a6=0, it is considered to be independent of the frequency F.

For example, if the T4 temperature is -7 °C, the corresponding compressor operating frequency should be 90HZ, and the expansion valve opening coefficient a6 of the corresponding temperature range is 1.2, b6 is 80, and c6 is 3. The expansion valve opening degree Lr=1.2*90+80+3*(-7)=167, according to the set opening degree Lr=167 steps, the second throttle element opening degree is adjusted: the initial opening degree of the second throttle element Lr For 200 steps, the second throttle element is turned off, and the set opening degree Lr=167 steps is reached. The second throttle element runs stably after reaching the set opening degree. After n seconds, the T4 was detected to be unchanged and continued to operate stably.

Example 10:

In this embodiment, a plurality of outdoor temperature intervals are preset, each outdoor temperature interval corresponds to a temperature of a different gas-liquid separator, and the first detection object and/or the second detection object is an outdoor ambient temperature T4 and a gas-liquid separator. The temperature firstly obtains the set temperature of the gas-liquid separator corresponding to the outdoor temperature range according to the actually detected outdoor ambient temperature T4, and then adjusts the opening degree of the second throttle element until the actually detected temperature of the gas-liquid separator Meet the set temperature.

Specifically, when the first detection object is the outdoor ambient temperature T4 and the temperature of the gas-liquid separator, the outdoor ambient temperature T4 and the temperature Ts of the gas-liquid separator are detected during the cooling start-up operation, and the corresponding outdoor is inquired according to the detected outdoor ambient temperature T4. The set temperature of the gas-liquid separator corresponding to the temperature interval, for example, the corresponding relationship between the outdoor temperature interval and the set temperature of the gas-liquid separator can be as follows: when 20 ° C ≥ T4: Ts takes 0-30; when 0 ° C < T4 ≤30°C: Ts takes 0-40; when 30°C<T4≤40°C: Ts takes 0-50; when 40°C<T4≤50°C: Ts takes 0-60; when 50°C<T4: Ts Take 0-65. It is to be understood that the above numerical values are only illustrative and are not intended to limit the invention.

The opening of the second throttle element is then adjusted such that the detected temperature Ts of the gas-liquid separator satisfies the set temperature.

For example, the startup cooling operation detects that the T4 temperature is 35 ° C. The temperature Ts of the corresponding gas-liquid separator under the T4 interval should be 26 ° C. The temperature Ts of the gas-liquid separator is detected to be 20 ° C under the initial opening degree. The small second throttle element reaches the second throttle element opening corresponding to the set temperature Ts=26° C., that is, the detected temperature Ts of the gas-liquid separator reaches the set temperature. The second throttling element reaches stable operation after reaching the target opening degree. After n seconds, the T4 was detected to be unchanged and continued to operate stably.

When the second detection object is the outdoor ambient temperature T4 and the temperature of the gas-liquid separator, the outdoor ambient temperature T4 and the temperature Ts of the gas-liquid separator are detected during the heating start operation, and the corresponding outdoor temperature interval is inquired according to the detected outdoor ambient temperature T4. The corresponding set temperature of the gas-liquid separator, for example, the outdoor temperature interval and the set temperature of the gas-liquid separator can be as follows: when -15 ° C ≥ T4: Ts takes -50 - 30; when -15 ° C < When T4≤-5°C: Ts takes -45-40; -5 ° C < T4 ≤ 5 ° C: Ts take -40 - 50; when 5 ° C < T4 ≤ 15 ° C: Ts take -35 - 60; when 15 ° C < T4: Ts take -30 - 65. It is to be understood that the above numerical values are only illustrative and are not intended to limit the invention.

For example, if the temperature of the T4 is 6 °C, the temperature Ts of the corresponding gas-liquid separator should be 20 °C under the T4 interval, and the Ts detected under the initial opening has reached 25 °C. The flow element reaches the second throttle element opening corresponding to the set temperature Ts=20° C. that is, the detected temperature Ts of the gas-liquid separator reaches the set temperature. The second throttling element reaches stable operation after reaching the target opening degree. After n seconds, the T4 was detected to be unchanged and continued to operate stably.

Example 11

In this embodiment, the first detection object and/or the second detection object are the outdoor ambient temperature T4 and the intermediate pressure; firstly, the operating frequency F is obtained according to the detected outdoor ambient temperature T4, and according to the detected outdoor ambient temperature T4 and The operating frequency F is calculated to obtain a set intermediate pressure, and then the opening of the second throttle element is adjusted such that the detected intermediate pressure reaches the set intermediate pressure.

Specifically, the relationship between the intermediate pressure Ps and the outdoor ambient temperature T4 and the operating frequency F may be Ps=a7*F+b7+c7*T4, wherein the range of values of a7, b7, and c7 may be compared with the outdoor environment. The temperature T4 corresponds to, for example, preset different outdoor ambient temperature intervals corresponding to different values of a7, b7, and c7, and then the values of a7, b7, and c7 can be limited according to actual conditions. It can be understood that the values of a7, b7, and c7 during cooling and the values of a7, b7, and c7 during heating may be the same or different.

For example, when heating, the temperature of T4 is detected to be 7 °C. The corresponding operating frequency of the compressor under T4 should be 75HZ. The pressure coefficient a7 of the corresponding temperature interval is 0.01, b7 is 0.6, and c7 is 0.1. Calculate the set intermediate pressure. Ps=0.01*75+0.6+0.1*7=2.05, adjust the opening of the second throttle element according to the set intermediate pressure Ps=2.05MPa: the initial pressure Ps has reached 1.8MPa under the initial opening degree, then open the first The second throttle element reaches the second throttle element opening corresponding to the set intermediate pressure Ps=2.05 MPa, that is, the opening degree of the second throttle element is adjusted such that the detected intermediate pressure reaches the set intermediate pressure, The second throttling element reaches stable operation after reaching the target opening degree. After n seconds, the T4 was detected to be unchanged and continued to operate stably.

Example 12

In this embodiment, a plurality of outdoor temperature intervals are preset, each outdoor temperature interval corresponds to a different gas-liquid separator pressure, and the first detection object and/or the second detection object is an outdoor ambient temperature T4 and a gas-liquid separator. The pressure firstly obtains the set pressure of the gas-liquid separator corresponding to the outdoor temperature range according to the actually detected outdoor ambient temperature T4, and then adjusts the opening degree of the second throttle element until the actually detected pressure of the gas-liquid separator Meet the set pressure.

Specifically, when the first detection object is the outdoor ambient temperature T4 and the pressure of the gas-liquid separator, the outdoor ambient temperature T4 and the pressure Ps of the gas-liquid separator are detected during the cooling start-up operation, and the corresponding outdoor is inquired according to the detected outdoor ambient temperature T4. The set pressure of the gas-liquid separator corresponding to the temperature interval, for example, the corresponding relationship between the outdoor temperature interval and the set pressure of the gas-liquid separator can be as follows: when 20 ° C ≥ T4: Ps takes 0.1-8; when 20 ° C < T4 When ≤30°C: Ps is 0.1-10; when 30°C<T4≤40°C: Ps is 0.1-15; when 40°C<T4≤50°C: Ps is 0.1-20; when 50°C<T4: Ps takes 0.1-25. It is to be understood that the above numerical values are only illustrative and are not intended to limit the invention.

Then, the opening degree of the second throttle element is adjusted so that the detected pressure Ps of the gas-liquid separator satisfies the set pressure.

For example, the startup cooling operation detects that the T4 temperature is 50 °C. The set pressure Ps of the corresponding gas-liquid separator under the T4 interval should be 2.0 MPa, and the pressure Ps of the gas-liquid separator detected at the initial opening degree has reached 2.2. MPa, the second throttle element is opened, and the second throttle element opening corresponding to the set pressure Ps=2.2 MPa is reached, that is, the detected pressure Ps of the gas-liquid separator satisfies the set pressure. The second throttling element reaches stable operation after reaching the target opening degree. After n seconds, the T4 was detected to be unchanged and continued to operate stably.

When the second detection object is the outdoor ambient temperature T4 and the pressure of the gas-liquid separator, the outdoor ambient temperature T4 and the pressure Ps of the gas-liquid separator are detected during the heating start operation, and the corresponding outdoor temperature interval is inquired according to the detected outdoor ambient temperature T4. The corresponding set pressure of the gas-liquid separator, for example, the corresponding relationship between the outdoor temperature interval and the set pressure of the gas-liquid separator can be as follows: when -15 ° C ≥ T4: Ps takes 0.1-10; when -15 ° C < T4 ≤-5°C: Ps is 0.1-12; when -5°C<T4≤5°C: Ps is 0.1-15; when 5°C<T4≤15°C: Ps is 0.1-20; when 15°C<T4 Time: Ps takes 0.1-25. It is to be understood that the above numerical values are only illustrative and are not intended to limit the invention.

For example, if the temperature of the T4 is -8 °C, the set pressure Ps of the corresponding gas-liquid separator should be 1.2 MPa. The pressure Ps of the gas-liquid separator is detected at the initial opening. 1.3MPa, the second throttle element is closed, and the second throttle element opening corresponding to the set pressure Ps=1.2MPa is reached, that is, the detected pressure Ps of the gas-liquid separator satisfies the set pressure. The second throttling element reaches stable operation after reaching the target opening degree. After n seconds, the T4 was detected to be unchanged and continued to operate stably.

It is to be understood that the above six specific embodiments are merely illustrative examples. The control method of the embodiment of the present invention is not limited to the above six types, for example, the opening degree of the second throttle element during cooling in the above six examples may be used. Adjustment method and The adjustment method of the opening degree of the second throttle element during heating is randomly combined. At the same time, it can be understood that the set parameters such as the set exhaust pressure, the set exhaust temperature, the set opening degree, and the set intermediate pressure calculated in the above embodiment may also be obtained by other methods, for example, may be set. Different outdoor temperature intervals, multiple outdoor temperature intervals correspond to unused setting parameters, and corresponding setting parameters can be obtained according to the outdoor temperature range in which the actually detected outdoor ambient temperature is located. It can also be understood that the above parameters obtained through the outdoor ambient temperature review can also be obtained by a preset calculation formula.

A control method of an air conditioner according to an embodiment of the present invention, wherein the air conditioner is a cold and warm type air conditioner according to the above embodiment of the present invention, a first throttle element opening degree, will be described in detail below with reference to FIGS. 1 , 2, 10 and 11. Adjustable, the second throttle element has a fixed opening.

A method of controlling an air conditioner according to an embodiment of the present invention includes the step of adjusting an opening degree of the first throttle element to a set opening degree according to a detection result of the first detection object during a cooling operation. During the heating operation, the opening degree of the first throttle element is adjusted to the set opening degree according to the detection result of the second detection object. That is to say, in the cooling and heating, the parameters required for controlling the first throttle element are collected and processed, and then the opening degree of the first throttle element is controlled according to the obtained parameters until the condition is satisfied.

The first detection object includes an outdoor ambient temperature, an operating frequency exhaust temperature of the two-cylinder compressor, an exhaust pressure of the exhaust port, an intermediate pressure of the refrigerant discharged from the gas outlet, an intermediate temperature of the refrigerant discharged from the gas outlet, and a gas. At least one of a liquid separator temperature and a gas-liquid separator pressure.

The second detection object includes an outdoor ambient temperature, an operating frequency of the two-cylinder compressor, an exhaust pressure of the exhaust port, an exhaust temperature of the exhaust port, an intermediate pressure of the refrigerant discharged from the gas outlet, and a refrigerant discharged from the gas outlet. At least one of an intermediate temperature, a gas-liquid separator temperature, and a gas-liquid separator pressure. It can be understood that the first detection object and the second detection object may be the same or different. It should be noted that the intermediate pressure and the intermediate temperature can be obtained by detecting the refrigerant in the line connecting the gas outlet and the second accumulator.

After the opening degree of the first throttle element satisfies the condition, the first detection object or the second detection object may be re-detected after n seconds of operation, and then the opening degree of the first throttle element is adjusted according to the detection result, and thus repeated. Of course, the repetition condition is not limited thereto. For example, after receiving the operation instruction of the user, the first detection object or the second detection object may be re-detected, and then the opening degree of the first throttle element is adjusted according to the detection result. In other words, in the cooling or heating, after the opening of the first throttle element satisfies the condition, the relevant parameter of the opening degree of the first throttle element can be re-run after n seconds of operation or after receiving the operation signal of the user. The judgment is detected, and then the opening degree of the first throttle element is adjusted according to the determination result, and thus repeated.

According to the control method of the air conditioner according to the embodiment of the invention, the opening degree of the first throttle element can be well controlled to reach the preset opening degree, thereby achieving the best energy saving effect.

The control method according to the embodiment of the present invention is described in detail below by taking six specific embodiments as an example. The opening degree of the first throttling element is adjustable, and the opening degree of the second throttling element is fixed.

Example 13

In this embodiment, the first detection object and/or the second detection object are the outdoor ambient temperature T4 and the exhaust gas temperature, and the operating frequency F is first obtained according to the detected outdoor ambient temperature T4, and according to the detected outdoor ambient temperature T4. The set exhaust temperature is calculated with the operating frequency F, and then the opening of the first throttle element is adjusted such that the detected exhaust temperature reaches the set exhaust temperature. It can be understood that the calculation formula is pre-set in the electronic control component of the air conditioner, and the calculation formula can be specifically limited according to the actual situation.

The operating opening of the first throttle element is then adjusted according to TP. The first throttling element is in stable operation after being adjusted in place. After n seconds, it is re-detected whether there is a change in the outdoor temperature T4 or whether the user has an operation, and then the opening degree of the first throttle element is adjusted according to the relevant change.

For example, in the startup and cooling operation, the T4 temperature is detected to be 35 ° C. The corresponding compressor operating frequency under the T4 should be 90 HZ, and the exhaust temperature coefficient a1 of the corresponding temperature interval is 0.6, b1 is 20, and c1 is 0.2. The exhaust gas temperature is TP=0.6*90+20+0.2*35=81, and the opening degree of the first throttle element is adjusted according to the set exhaust gas temperature Tp=81°C: the TP detected at the initial opening degree has reached 90 degrees. Then, the first throttle element is opened to reach the first throttle element opening corresponding to the set exhaust temperature Tp=81° C. that is, the detected exhaust temperature reaches the set exhaust temperature. The first throttling element reaches stable operation after reaching the target opening degree. After n seconds, the T4 was detected to be unchanged and continued to operate stably.

When the second detection object is the outdoor ambient temperature T4 and the exhaust temperature, the outdoor ambient temperature T4 is detected during the heating startup, the operating frequency F of the compressor is determined according to T4, and the exhaust temperature TP is determined according to T4 and F, wherein TP =a2*F+b2+c2*T4; the range of values of a2, b2, and c2 can correspond to the outdoor ambient temperature T4, for example, when 5°C<T4≤15°C: a2 takes -8--8; b2 takes - 80--80; c2 takes -8-8; when 15 °C < T4: a2 takes -9--9; b2 takes -90--90; c2 takes -6-6. It is of course understood that the values of a2, b2, and c2 are not limited thereto, and may be, for example, independent of the outdoor ambient temperature T4, but are preset in the system. It should be noted that when one or both of a2 and b2 When the value is 0, it can be considered that the above formula is independent of the parameter. For example, when a2=0, it is considered to be independent of the frequency F.

The operating opening of the first throttle element is then adjusted according to TP. The first throttling element is in stable operation after being adjusted in place. After n seconds, it is re-detected whether there is a change in the outdoor temperature T4 or whether the user has an operation, and then the first throttle element opening degree is adjusted according to the relevant change.

For example, when the open mechanism is hot running, the T4 temperature is detected to be 7 ° C. The corresponding compressor operating frequency under the T4 should be 75 HZ, and the exhaust temperature coefficient a2 of the corresponding temperature range is 0.4, b2 is 10, and c2 is 5. Exhaust temperature Tp=0.4*75+10+5*7=75, according to the set exhaust temperature Tp=75°C, adjust the opening of the first throttling element: the Tp detected at the initial opening has reached 70°C, Then, the small expansion valve is closed, and the opening degree of the first throttle element corresponding to the set exhaust gas temperature Tp=75° C. is reached, that is, the detected exhaust gas temperature reaches the set exhaust gas temperature. The first throttling element reaches stable operation after reaching the target opening degree. After n seconds, the T4 was detected to be unchanged and continued to operate stably.

Example 14

In this embodiment, the first detection object and/or the second detection object are the outdoor ambient temperature T4 and the exhaust pressure, and the operating frequency F is first obtained according to the detected outdoor ambient temperature T4, and according to the detected outdoor ambient temperature T4. The set exhaust pressure is calculated with the operating frequency F, and then the opening of the first throttle element is adjusted such that the detected exhaust pressure reaches the set exhaust pressure.

Specifically, when the first detection object is the outdoor ambient temperature T4 and the exhaust pressure, the outdoor ambient temperature T4 is detected when the cooling is turned on, the operating frequency F of the compressor is determined according to T4, and the exhaust pressure Pp is determined according to T4 and F; Where Pp=a3*F+b3+c3*T4; the range of values of a3, b3, and c3 may correspond to the outdoor ambient temperature T4, for example, when 20 ° C ≥ T4: a3 takes -5 - 5; b3 takes -8 --8; c3 takes -1 -1; when 20 ° C < T4 ≤ 30 ° C: a3 takes -5 - 5; b3 takes -10--10; c3 takes -2 - 2; when 30 ° C < T4 ≤ 40 °C: a3 take -5--5; b3 take -12--12; c3 take -3-3; when 40 °C <T4 ≤ 50 °C: a3 take -6--6; b3 take -15-- 15; c3 takes -4 - 4; when 50 ° C < T4: a3 takes -7--7; b3 takes -20--20; c3 takes -5-5. It is of course understood that the values of a3, b3, and c3 are not limited thereto, and may be, for example, independent of the outdoor ambient temperature T4, but are preset in the system. It should be noted that when one of a3 and b3 or a value of 0 at the same time, it can be considered that the above formula is independent of the parameter, for example, when a3=0, it is considered to be the frequency F. Nothing.

The operating opening of the first throttle element is then adjusted according to Pp. The first throttling element is in stable operation after being adjusted in place. After n seconds, it is re-detected whether there is a change in the outdoor temperature T4 or whether the user has an operation, and then the first throttle element opening degree is adjusted according to the relevant change.

For example, the startup cooling operation detects that the T4 temperature is 35 °C, and the corresponding compressor operating frequency under the T4 should be 80HZ, and the exhaust pressure coefficient a3 of the corresponding temperature interval is 0.02, b3 is 0.7, and c3 is 0.02, and the exhaust is calculated. The pressure Pp=0.02*80+0.7+0.02*35=3.0, and the first throttle element opening degree is adjusted according to the set exhaust pressure Pp=3.0 MPa: when the exhaust pressure Pp has reached 2.5 MPa when the initial opening degree is detected, The first throttle element is closed, and the first throttle element opening corresponding to the set exhaust pressure Pp=3.0 MPa is reached, that is, the detected exhaust pressure reaches the set exhaust pressure. After the first throttling element reaches the target opening degree, it runs stably. After n seconds, it detects that T4 has not changed and continues to operate stably.

When the second detection object is the outdoor ambient temperature T4 and the exhaust pressure, the outdoor ambient temperature T4 is detected when the heating is turned on, the operating frequency F of the compressor is determined according to T4, and the exhaust pressure Pp is determined according to T4 and F; wherein Pp =a4*F+b4+c4*T4; the range of values of a4, b4, and c4 can correspond to the outdoor ambient temperature T4, for example, when -15 °C ≥ T4: a4 takes -10--10; b4 takes -8- -8; c4 takes -5-5; when -15 °C <T4 ≤ -5 °C: a4 takes -12-12; b4 takes -10--10; c4 takes -6-6; when -5 °C <T4 ≤ 5 ° C: a4 take -15--15; b4 take -12--12; c4 take -7-7; when 5 ° C <T4 ≤ 15 ° C: a4 take -18--18; b4 take -15 --15; c4 take -8-8; when 15 ° C < T4: a4 take -20--20; b4 take -18--18; c4 take -9-9. It is of course understood that the values of a4, b4, and c4 are not limited thereto, and may be, for example, independent of the outdoor ambient temperature T4, but are preset in the system. It should be noted that when one of a4 and b4 or a value of 0 at the same time, it can be considered that the above formula is independent of the parameter, for example, when a4=0, it is considered to be independent of the frequency F.

For example, if the temperature of the T4 is 7°C, the corresponding operating frequency of the compressor should be 75HZ, and the corresponding temperature range is 0.02, b4 is 0.9, c4 is 0.02, and the exhaust pressure Pp= is calculated. 0.02*80+0.9+0.02*35=3.2, according to the set exhaust pressure Pp=3.2MPa, adjust the opening degree of the first throttle element: the exhaust pressure Ps detected at the initial opening degree has reached 3.0MPa, then The first throttle element is closed, and the first throttle element opening corresponding to the set exhaust pressure Ps=3.2 MPa is reached, that is, the detected exhaust pressure reaches the set exhaust pressure. Stable operation after reaching the target opening. After n seconds, the T4 was detected to be unchanged and continued to operate stably.

In this embodiment, the operating frequency of the compressor is determined by the outdoor ambient temperature, for example, a predetermined plurality of outdoor ambient temperature intervals, and the plurality of outdoor ambient temperature intervals respectively correspond to the plurality of compressor operating frequencies, and the detected outdoor environment is queried. The outdoor operating temperature range in which the temperature is located can be used to obtain the corresponding compressor operating frequency. It will of course be understood that the operating frequency of the compressor can also be detected by means of a detection device provided on the compressor.

Example 15

In this embodiment, the first detection object and/or the second detection object is the outdoor ambient temperature T4, and the operating frequency F is first obtained according to the detected outdoor ambient temperature T4, and according to the detected outdoor ambient temperature T4 and the operating frequency F. The set opening degree of the first throttle element is calculated, and then the opening degree of the first throttle element is adjusted to the set opening degree.

Specifically, when the first detection object is the outdoor ambient temperature T4, the outdoor ambient temperature T4 is detected at the start of cooling; the compressor operating frequency F is determined according to T4, and the set opening degree Lr of the first throttle element is determined according to T4 and F; The opening degree Lr=a5*F+b5+c5*T4 is set; wherein the range of values of a5, b5, and c5 can correspond to the outdoor ambient temperature T4, for example, preset different outdoor ambient temperature ranges corresponding to different a5, b5 The range of values of c5, and then the values of a5, b5, and c5 can be limited according to actual conditions.

Comparing the difference between the set opening degree Lr of the first throttle element and the initial opening degree of the first throttle element, if it is consistent, no adjustment is needed, and if it is inconsistent, it is adjusted to the set opening degree Lr. The first throttling element is in stable operation after being adjusted in place. After n seconds, it is re-detected whether there is a change in the outdoor temperature T4 or whether the user has an operation, and then the first throttle element opening degree is adjusted according to the relevant change.

When the second detection object is the outdoor ambient temperature T4, the outdoor ambient temperature T4 is detected at the start of heating; the compressor operating frequency F is determined according to T4, and the set opening degree Lr of the first throttle element is determined according to T4 and F; The opening degree Lr=a6*F+b6+c6*T4; wherein the range of values of a6, b6, and c6 may correspond to the outdoor ambient temperature T4, for example, when -15 ° C ≥ T4: a6 takes -20--20; B6 takes -200--200; c6 takes -10-10; when -15 °C <T4 ≤ -5 °C: a6 takes -18--18; b6 takes -180--180; c6 takes -9-9; When -5 ° C < T4 ≤ 5 ° C: a6 take -15--15; b6 take -150--150; c6 take -8-8. It is of course understood that the values of a6, b6, and c6 are not limited thereto, and may be, for example, independent of the outdoor ambient temperature T4, but are preset in the system. It should be noted that when one of a6 and b6 or a value of 0 at the same time, it can be considered that the above formula is independent of the parameter, for example, when a6=0, it is considered to be independent of the frequency F.

For example, if the T4 temperature is -7 °C, the corresponding compressor operating frequency should be 90HZ, and the expansion valve opening coefficient a6 of the corresponding temperature range is 1.2, b6 is 80, and c6 is 3. The expansion valve opening degree Lr=1.2*90+80+3*(-7)=167, according to the set opening degree Lr=167 steps, the first throttle element opening degree is adjusted: the first throttle element initial opening degree Lr For 200 steps, the first throttle element is turned off, and the set opening degree Lr=167 steps is reached. The first throttling element reaches stable operation after reaching the set opening degree. After n seconds, the T4 was detected to be unchanged and continued to operate stably.

In this embodiment, the operating frequency of the compressor is determined by the outdoor ambient temperature, such as a predetermined plurality of outdoor environments. In the temperature interval, a plurality of outdoor ambient temperature intervals respectively correspond to a plurality of compressor operating frequencies, and the outdoor ambient temperature range in which the detected outdoor ambient temperature is located is queried to obtain a corresponding compressor operating frequency. It will of course be understood that the operating frequency of the compressor can also be detected by means of a detection device provided on the compressor.

Example 16:

In this embodiment, a plurality of outdoor temperature intervals are preset, each outdoor temperature interval corresponds to a temperature of a different gas-liquid separator, and the first detection object and/or the second detection object is an outdoor ambient temperature T4 and a gas-liquid separator. The temperature firstly obtains the set temperature of the gas-liquid separator corresponding to the outdoor temperature range according to the actually detected outdoor ambient temperature T4, and then adjusts the opening degree of the first throttle element until the actually detected temperature of the gas-liquid separator Meet the set temperature.

Then, the opening degree of the first throttle element is adjusted such that the detected temperature Ts of the gas-liquid separator satisfies the set temperature.

For example, the startup cooling operation detects that the T4 temperature is 35 ° C. The temperature Ts of the corresponding gas-liquid separator under the T4 interval should be 26 ° C. When the temperature Ts of the gas-liquid separator is detected to be 20 ° C under the initial opening degree, the temperature is turned on. The large first throttle element reaches the first throttle element opening corresponding to the set temperature Ts=26° C., that is, the detected temperature Ts of the gas-liquid separator reaches the set temperature. The first throttling element reaches stable operation after reaching the target opening degree. After n seconds, the T4 was detected to be unchanged and continued to operate stably.

When the second detection object is the outdoor ambient temperature T4 and the temperature of the gas-liquid separator, the outdoor ambient temperature T4 and the temperature Ts of the gas-liquid separator are detected during the heating start operation, and the corresponding outdoor temperature interval is inquired according to the detected outdoor ambient temperature T4. The corresponding set temperature of the gas-liquid separator, for example, the outdoor temperature interval and the set temperature of the gas-liquid separator can be as follows: when -15 ° C ≥ T4: Ts takes -50 - 30; when -15 ° C < When T4≤-5°C: Ts is -45-40; when -5°C<T4≤5°C: Ts is -40-50; when 5°C<T4≤15°C: Ts is -35-60; When 15 ° C < T4: Ts takes -30-65. It is to be understood that the above numerical values are only illustrative and are not intended to limit the invention.

For example, if the temperature of the T4 is 6 °C, the temperature Ts of the corresponding gas-liquid separator should be 20 °C under the T4 interval, and the Ts detected at the initial opening has reached 25 °C. Flow element, reaching the set temperature Ts=20°C corresponds to the first throttle element opening degree, that is, the detected temperature Ts of the gas-liquid separator reaches the set temperature. The first throttling element reaches stable operation after reaching the target opening degree. After n seconds, the T4 was detected to be unchanged and continued to operate stably.

Example 17

In this embodiment, the first detection object and/or the second detection object are the outdoor ambient temperature T4 and the intermediate pressure; firstly, the operating frequency F is obtained according to the detected outdoor ambient temperature T4, and according to the detected outdoor ambient temperature T4 and The operating frequency F is calculated to obtain a set intermediate pressure, and then the opening of the first throttle element is adjusted such that the detected intermediate pressure reaches the set intermediate pressure.

For example, when heating, the temperature of T4 is detected to be 7 °C. The corresponding operating frequency of the compressor under T4 should be 75HZ. The pressure coefficient a7 of the corresponding temperature interval is 0.01, b7 is 0.6, and c7 is 0.1. Calculate the set intermediate pressure. Ps=0.01*75+0.6+0.1*7=2.05, adjust the opening of the first throttling element according to the set intermediate pressure Ps=2.05MPa: the initial pressure Ps has reached 1.8MPa under the initial opening degree, then open the first a throttle element that reaches a first throttle element opening corresponding to a set intermediate pressure Ps=2.05 MPa, that is, adjusts an opening degree of the first throttle element such that the detected intermediate pressure reaches a set intermediate pressure, The first throttling element reaches stable operation after reaching the target opening degree. After n seconds, the T4 was detected to be unchanged and continued to operate stably.

Example 18

In this embodiment, a plurality of outdoor temperature intervals are preset, each outdoor temperature interval corresponds to a different gas-liquid separator pressure, and the first detection object and/or the second detection object is an outdoor ambient temperature T4 and a gas-liquid separator. The pressure firstly obtains the set pressure of the gas-liquid separator corresponding to the outdoor temperature range according to the actually detected outdoor ambient temperature T4, and then adjusts the opening degree of the first throttle element until the actually detected pressure of the gas-liquid separator Meet the set pressure.

Specifically, when the first detection object is the outdoor ambient temperature T4 and the pressure of the gas-liquid separator, the outdoor ambient temperature T4 and the pressure Ps of the gas-liquid separator are detected during the cooling start-up operation, and the corresponding outdoor temperature T4 is queried according to the detected outdoor ambient temperature T4. The set pressure of the gas-liquid separator corresponding to the outdoor temperature interval, for example, the corresponding relationship between the outdoor temperature interval and the set pressure of the gas-liquid separator can be as follows: when 20 ° C ≥ T4: Ps takes 0.1-8; when 20 ° C < When T4≤30°C: Ps is 0.1-10; when 30°C<T4≤40°C: Ps is 0.1-15; when 40°C<T4≤50°C: Ps is 0.1-20; when 50°C<T4 :Ps takes 0.1-25. It is to be understood that the above numerical values are only illustrative and are not intended to limit the invention.

Then, the opening degree of the first throttle element is adjusted so that the detected pressure Ps of the gas-liquid separator satisfies the set pressure.

For example, the startup cooling operation detects that the T4 temperature is 50 °C. The set pressure Ps of the corresponding gas-liquid separator under the T4 interval should be 2.0 MPa, and the pressure Ps of the gas-liquid separator detected at the initial opening degree has reached 2.2. MPa, the first throttle element is closed, and the first throttle element opening corresponding to the set pressure Ps=2.2 MPa is reached, that is, the detected pressure Ps of the gas-liquid separator satisfies the set pressure. The first throttling element reaches stable operation after reaching the target opening degree. After n seconds, the T4 was detected to be unchanged and continued to operate stably.

For example, if the temperature of the T4 is -8 °C, the set pressure Ps of the corresponding gas-liquid separator should be 1.2 MPa. The pressure Ps of the gas-liquid separator is detected at the initial opening. 1.3MPa, the first throttle element is opened, and the first throttle element opening corresponding to the set pressure Ps=1.2MPa is reached, that is, the detected pressure Ps of the gas-liquid separator satisfies the set pressure. The first throttling element reaches stable operation after reaching the target opening degree. After n seconds, the T4 was detected to be unchanged and continued to operate stably.

It is to be understood that the above six specific embodiments are merely illustrative examples. The control method of the embodiment of the present invention is not limited to the above six types, for example, the opening degree of the first throttle element during cooling in the above six examples may be used. The adjustment mode and the adjustment method of the opening degree of the first throttle element during heating are randomly combined. At the same time, it can be understood that the set parameters such as the set exhaust pressure, the set exhaust temperature, the set opening degree, and the set intermediate pressure calculated in the above embodiment may also be obtained by other methods, for example, may be set. Different outdoor temperature intervals, multiple outdoor temperature intervals correspond to unused setting parameters, and corresponding setting parameters can be obtained according to the outdoor temperature range in which the actually detected outdoor ambient temperature is located. It can also be understood that the above parameters obtained through the outdoor ambient temperature review can also be obtained by a preset calculation formula.

A control method of an air conditioner according to an embodiment of the present invention, wherein the air conditioner is a cold and warm type air conditioner according to the above embodiment of the present invention, a first throttle element and a second throttle, will be described in detail below with reference to FIGS. 1 to 2 and 12. The opening of the component is fixed.

A method for controlling an air conditioner according to an embodiment of the present invention includes the steps of: adjusting a running frequency of a two-cylinder compressor to meet a condition according to a detected compressor operating parameter and/or an outdoor ambient temperature during a cooling or heating operation, wherein the compression The machine operating parameters include at least one of an operating current, an exhaust pressure, and an exhaust temperature. In other words, during the cooling or heating operation, the operating frequency of the two-cylinder compressor is adjusted according to the detection result of the detection object, wherein the detection object includes the outdoor ambient temperature, the exhaust temperature of the exhaust port, the exhaust pressure of the exhaust port, and the double cylinder. At least one of the operating currents of the compressor.

When the operating frequency of the two-cylinder compressor is adjusted to meet the conditions, the compressor operating parameters and/or the outdoor ambient temperature may be re-detected after n seconds of operation, and then the operating frequency of the compressor is adjusted according to the re-detected detection result, thus repeating . Of course, the repetition condition is not limited thereto. For example, after receiving the operation instruction of the user, the compressor operation parameter and/or the outdoor environment temperature may be re-detected, and then the operating frequency of the compressor may be adjusted according to the re-detected detection result. In other words, during cooling or heating, after the operating frequency of the compressor meets the conditions, the compressor operating parameters and/or the outdoor ambient temperature may be re-detected after n seconds of operation or after receiving the user's operating signal, and then according to the detection. As a result, the operating frequency is adjusted and repeated.

In a specific example of the present invention, during operation of the air conditioner, if a user shutdown command is detected or the indoor ambient temperature reaches a set temperature, the compressor stops operating.

According to the control method of the air conditioner according to the embodiment of the present invention, by adjusting the operating frequency of the compressor according to the detection result during the operation, the system can be operated within a suitable parameter range, and the reliability of the operation of the air conditioner can be improved.

In some embodiments of the present invention, a plurality of different exhaust gas temperature intervals are first preset, and the plurality of exhaust gas temperature ranges have different adjustment commands corresponding to the operating frequency, and then the exhaust gas temperature is detected and according to the detected exhaust gas temperature. The adjustment command corresponding to the exhaust temperature range adjusts the operating frequency. The adjustment command may include instructions of down-converting, up-converting, maintaining frequency, shutting down, and releasing the frequency limit. Therefore, by detecting the exhaust gas temperature and adjusting the operating frequency of the compressor, the operating state of the system can be directly reacted to ensure that the system operates within a suitable parameter range, thereby further improving the reliability of the operation of the air conditioner. It should be noted that the release of the frequency limit means that the operating frequency of the compressor is not limited, and it is not necessary to adjust the operating frequency of the compressor.

For example, the air conditioner is turned on and off, and the exhaust temperature TP is detected during operation. The following adjustment commands are set: 115 °C ≤ TP, shutdown; 110 ° C ≤ TP < 115 ° C, down frequency to TP < 110 ° C; 105 ° C ≤ TP<110°C, frequency hold; TP<105°C, release frequency limit. Then, according to the actually detected exhaust gas temperature TP, a corresponding adjustment command is executed, and after the adjustment is completed, the TP is detected again. If the adjustment is satisfied, the determination is ended. After n seconds of operation, the exhaust gas temperature TP is detected again, and the determination is repeated. While running for n seconds, if the user shutdown command is detected or the set temperature is reached, the operation ends.

In some embodiments of the present invention, a plurality of outdoor temperature intervals, a heating shutdown protection current, and a cooling shutdown protection current are preset, and the plurality of outdoor temperature intervals correspond to different frequency limiting protection currents. First detect the outdoor ambient temperature, then according to The detected outdoor temperature range in which the outdoor ambient temperature is located is subjected to a corresponding frequency-limiting protection current, and the operating frequency is adjusted so that the actually detected operating current reaches a corresponding frequency-limiting protection current, wherein the operating current detected during cooling is greater than the cooling shutdown. When the current is protected, it will stop directly; when the running current detected during heating is greater than the heating shutdown protection current, it will stop directly.

Specifically, the correspondence between the plurality of outdoor temperature intervals and the corresponding frequency limiting protection current during cooling can be as follows: when T4>50.5° C., the frequency limiting protection current is CL5; when 49.5° C≥T4>45.5° C., the limit is The frequency protection current is CL4; when 44.5°C≥T4>41°C, the frequency limiting protection current is CL3; when 40°C≥T4>33°C, the frequency limiting protection current is CL2; when 32≥T4°C, the frequency limiting protection current is CL1. The specific values of the CL5, CL4, CL3, CL2, and CL1 and the cooling shutdown protection current may be specifically limited according to actual conditions, and are not limited herein.

For example, when the outdoor ambient temperature T4 detected during the cooling operation is within the outdoor temperature range of 40 ° C ≥ T4 > 33 ° C, it means that the operating current is not allowed to exceed the frequency limiting protection current CL2. If it is exceeded, the frequency will be reduced to lower than the operating current. The frequency limiting protection current is CL2.

The corresponding relationship between multiple outdoor temperature intervals and the corresponding frequency limiting protection current during heating can be as follows: when T4>15°C, the frequency limiting protection current is HL5; when 14°C>T4≥10°C, the frequency limiting protection The current is HL4; when 9°C>T4≥6°C, the current limiting protection current is HL3; when 5°C>T4≥-19°C, the frequency limiting protection current is HL2; when -20°C>T4, the frequency limiting protection current is HL1. The specific values of HL5, HL4, HL3, HL2, HL1 and the heating shutdown protection current can be specifically limited according to the actual situation, and are not limited herein.

For example, when the outdoor ambient temperature T4 detected during heating operation is located in the outdoor temperature range of 9 °C>T4≥6 °C, it means that the operating current is not allowed to exceed the frequency limiting protection current HL3. If it exceeds, the frequency will be reduced to lower than the running current. Frequency limiting protection current HL3.

In some embodiments of the present invention, a plurality of outdoor temperature intervals may be preset, and the plurality of outdoor temperature intervals correspond to different set operating frequencies, and the set operating frequency corresponding to the outdoor temperature range in which the actually detected outdoor ambient temperature is located Adjust the operating frequency of the compressor.

In some embodiments of the present invention, a plurality of different exhaust pressure intervals are first preset, and the adjustment commands of the operating frequencies corresponding to the plurality of exhaust pressure intervals are different, and then the exhaust pressure is detected and according to the detected exhaust pressure. The adjustment command corresponding to the exhaust pressure range adjusts the operating frequency. The adjustment command may include instructions of down-converting, up-converting, maintaining frequency, shutting down, and releasing the frequency limit. Therefore, by detecting the exhaust pressure to adjust the operating frequency of the compressor, the operating state of the system can be directly reacted to ensure that the system operates within a suitable parameter range, thereby further improving the reliability of the operation of the air conditioner.

It should be noted that when the air conditioner is a single-cooling type air conditioner, the control method of the single-cooling type air conditioner is the same as that of the cooling and cooling type air conditioner, and will not be described in detail herein.

In the present invention, the first feature "on" or "under" the second feature may be a direct contact of the first and second features, or the first and second features may be indirectly through an intermediate medium, unless otherwise explicitly stated and defined. contact. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined and combined.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims

A cold and warm type air conditioner, comprising:

a two-cylinder compressor comprising a casing, a first cylinder, a second cylinder, a first accumulator and a second accumulator, wherein the casing is provided with an exhaust port, the first a cylinder and the second cylinder are respectively disposed in the casing, the first accumulator and the second accumulator are disposed outside the casing, and an intake port of the first cylinder and the first a reservoir is connected, an intake port of the second cylinder is in communication with the second accumulator, and an exhaust volume ratio of the second cylinder and the first cylinder is in a range of 1% to 10 %;

a reversing assembly comprising a first valve port to a fourth valve port, the first valve port being in communication with one of a second valve port and a third valve port, the fourth valve port being a second valve port is in communication with the other of the third valve port, the first valve port is connected to the exhaust port, and the fourth valve port is connected to the first reservoir;

An outdoor heat exchanger and an indoor heat exchanger, wherein the first end of the outdoor heat exchanger is connected to the second valve port, and the first end of the indoor heat exchanger is connected to the third valve port;

a gas-liquid separator comprising a gas outlet, a first interface and a second interface, the gas outlet being connected to the second reservoir, the first interface and the outdoor heat exchanger The second end is connected to the second end of the indoor heat exchanger, and the first throttle element is connected in series between the first interface and the outdoor heat exchanger, and the second interface A second throttle element is connected in series with the indoor heat exchanger.
The air-conditioning type air conditioner according to claim 1, wherein a solenoid valve is connected in series between the gas outlet and the second accumulator.
The cold and warm type air conditioner according to claim 1 or 2, wherein the volume of the gas-liquid separator ranges from 100 mL to 500 mL.
The air-conditioning type air conditioner according to any one of claims 1 to 3, wherein a volume of the first accumulator is larger than a volume of the second accumulator.
A single-cooling type air conditioner, comprising:

a two-cylinder compressor comprising a casing, a first cylinder, a second cylinder, a first accumulator and a second accumulator, wherein the casing is provided with an exhaust port, the first a cylinder and the second cylinder are respectively disposed in the casing, the first accumulator and the second accumulator are disposed outside the casing, and an intake port of the first cylinder and the first a reservoir is connected, an intake port of the second cylinder is in communication with the second accumulator, and an exhaust volume ratio of the second cylinder and the first cylinder is in a range of 1% to 10 %;

An outdoor heat exchanger and an indoor heat exchanger, wherein the first end of the outdoor heat exchanger is connected to the exhaust port, and the first end of the indoor heat exchanger is connected to the first liquid accumulator;

a gas-liquid separator comprising a gas outlet, a first interface and a second interface, the gas outlet being connected to the second reservoir, the first interface and the outdoor heat exchanger The second end is connected, the second interface is The second end of the indoor heat exchanger is connected, a first throttling element is connected in series between the first interface and the outdoor heat exchanger, and a second connection between the second interface and the indoor heat exchanger is Two throttling components.
The single-cooling type air conditioner according to claim 5, wherein a solenoid valve is connected in series between the gas outlet and the second accumulator.
The single-cooling type air conditioner according to claim 5 or 6, wherein the volume of the gas-liquid separator ranges from 100 mL to 500 mL.
The single-cooling type air conditioner according to any one of claims 5 to 7, characterized in that the volume of the first accumulator is larger than the volume of the second accumulator.
A method of controlling an air conditioner, the air conditioner according to any one of claims 1 to 4, or the single-cooling type air conditioner according to any one of claims 5-8 The first throttling element and the throttling element located upstream of the second throttling element are first-stage throttling elements, the first throttling element and the The throttling element located downstream of the second throttling element is a secondary throttling element;

When the opening degrees of the first throttle element and the second throttle element are both adjustable, the control method includes the following steps: first adjusting the primary throttle element according to the detection result of the first detection object The opening degree is set to the opening degree, and then the opening degree of the secondary throttle element is adjusted to the set opening degree according to the detection result of the second detection object, and the setting opening degree of the first-stage throttling element is smaller than Setting the opening degree of the secondary throttle element, the detection result of the first detection object is different from the detection result of the second detection object;

When one of the first throttle element and the second throttle element is adjustable and the other opening is fixed, the control method includes the following steps: according to the first detection object during the cooling operation The detection result adjusts the opening degree of the throttle element with adjustable opening degree to the set opening degree; when the air conditioner is a cold and warm type air conditioner, the opening degree is also adjusted according to the detection result of the second detection object during the heating operation Adjustable opening of the throttling element to a set opening degree;

When the opening degrees of the first throttle element and the second throttle element are both fixed, the control method includes the steps of: adjusting the two cylinders according to the detected compressor operating parameters and/or the outdoor ambient temperature The operating frequency of the compressor meets a condition, wherein the compressor operating parameter includes at least one of an operating current, an exhaust pressure, and an exhaust temperature;

The first detection object includes an outdoor ambient temperature, an operating frequency of the two-cylinder compressor, an exhaust temperature of the exhaust port, an exhaust pressure of the exhaust port, an intermediate pressure of the refrigerant discharged from the gas outlet, and a At least one of an intermediate temperature of the refrigerant discharged from the gas outlet, a gas-liquid separator temperature, and a gas-liquid separator pressure;

The second detection object includes an outdoor ambient temperature, an operating frequency of the two-cylinder compressor, an exhaust temperature of the exhaust port, an exhaust pressure of the exhaust port, an intermediate pressure of the refrigerant discharged from the gas outlet, and the At least one of an intermediate temperature of the refrigerant discharged from the gas outlet, a gas-liquid separator temperature, and a gas-liquid separator pressure.
The control method of an air conditioner according to claim 9, wherein the first detection object and/or the second detection object are an outdoor ambient temperature T4 and an operation frequency F, according to the detected outdoor environment Temperature T4 And the running frequency F is calculated to obtain a corresponding opening degree adjustable throttle element setting opening degree, and then the opening degree of the corresponding throttle element is adjusted according to the set opening degree.
The control method of an air conditioner according to claim 9, wherein the first detection object and/or the second detection object are an outdoor ambient temperature T4, an operation frequency F, and an exhaust pressure; or an outdoor environment The temperature T4, the operating frequency F, and the exhaust gas temperature are first calculated according to the outdoor ambient temperature T4 and the operating frequency F to obtain a set exhaust pressure or set an exhaust temperature, and then according to the actually detected exhaust pressure or exhaust The gas temperature adjusts the opening of the corresponding opening-adjustable throttle element such that the detected exhaust pressure or exhaust temperature reaches a set exhaust pressure or sets the exhaust temperature.
The control method of an air conditioner according to claim 9, wherein a plurality of outdoor temperature intervals are preset, each of the outdoor temperature intervals corresponding to an opening of a different throttling element,

The first detection object and/or the second detection object is an outdoor ambient temperature T4, and the opening degree of the throttle element with adjustable opening degree is adjusted according to the opening degree value corresponding to the outdoor temperature interval in which the actually detected outdoor environmental temperature T4 is located. .
The control method of the air conditioner according to claim 9, wherein the intermediate temperature or the preset intermediate pressure is preset, and the first detection object and/or the second detection object is an intermediate pressure or an intermediate temperature, according to actual detection. The intermediate pressure or the intermediate temperature is adjusted to adjust the opening degree of the corresponding opening-adjustable throttle element such that the detected intermediate pressure or intermediate temperature reaches a preset intermediate pressure or a preset intermediate temperature.
The air conditioner control method according to claim 9, wherein a plurality of outdoor temperature intervals are preset, each of the outdoor temperature intervals corresponding to a different set temperature of the gas-liquid separator, the first The detection object and/or the second detection object are the outdoor ambient temperature T4 and the temperature of the gas-liquid separator, and firstly, according to the actually detected outdoor ambient temperature T4, the gas-liquid separator corresponding to the outdoor temperature interval is obtained. The temperature is set, and then the opening of the corresponding opening-adjustable throttle element is adjusted until the actually detected temperature of the gas-liquid separator satisfies the set temperature.
The control method of an air conditioner according to claim 9, wherein when the opening degrees of the first throttle element and the second throttle element are both fixed, a plurality of different exhaust temperature intervals are preset The plurality of exhaust gas temperature ranges have different adjustment commands of the operating frequency, and the exhaust gas temperature is detected, and the operating frequency is adjusted according to an adjustment command corresponding to the exhaust gas temperature range in which the detected exhaust gas temperature is located.
The control method of an air conditioner according to claim 9, wherein when the opening degrees of the first throttle element and the second throttle element are both fixed, a plurality of outdoor temperature intervals and heating are preset The shutdown protection current and the refrigeration shutdown protection current, the plurality of outdoor temperature intervals correspond to different frequency limiting protection currents, first detecting the outdoor ambient temperature, and then obtaining the corresponding frequency limiting protection current according to the detected outdoor temperature interval in which the outdoor ambient temperature is located Adjusting the operating frequency to cause the actually detected operating current to reach the corresponding frequency limiting protection current, wherein the operating current detected when cooling is greater than the cooling shutdown protection current is directly stopped; when heating When the running current detected at the time is greater than the heating shutdown protection current, the device is directly stopped.
The control method of an air conditioner according to claim 9, wherein when the opening degrees of the first throttle element and the second throttle element are both fixed, a plurality of different exhaust pressure intervals are preset The adjustment command of the operating frequency corresponding to the plurality of exhaust pressure intervals is different, detecting the exhaust pressure and adjusting the operating frequency according to an adjustment command corresponding to the exhaust pressure range in which the detected exhaust pressure is located.