CN105783313B - Single cold type air conditioner and its control method - Google Patents

Abstract

The invention discloses a kind of single cold type air conditioner and its control methods.Single cold type air conditioner includes: duplex cylinder compressor, outdoor heat exchanger, indoor heat exchanger, gas-liquid separator, refrigerant radiator, the air entry of first cylinder is connected to the first liquid storage device, and the value range of the delivery space ratio of the second cylinder and the first cylinder is 1%~10%；Gas-liquid separator includes gas vent, first interface and second interface, gas vent is connected with the second cylinder, it is in series with the adjustable first throttle element of aperture between first interface and outdoor heat exchanger, adjustable second restricting element of aperture is in series between second interface and indoor heat exchanger.Refrigerant radiator tandem is between gas vent and the air entry of second cylinder.Single cold type air conditioner of the invention, effectively improves energy efficiency of air conditioner.

Description

Single-cooling type air conditioner and control method thereof

Technical Field

The invention relates to the field of refrigeration, in particular to a single-cooling type air conditioner and a control method thereof.

Background

The existing air conditioner refrigeration system does not carry out optimal cycle design on a gas refrigerant after throttling and before entering an evaporator, so that the gas refrigerant influences the heat exchange performance of the evaporator, and the compression power consumption of a compressor is increased, thereby influencing the energy efficiency level of the air conditioner. The enhanced vapor injection and two-stage compression technology can improve the heating capacity level of the air conditioning system at low temperature and ultralow temperature, but the energy efficiency improvement is very limited under the refrigeration working condition frequently used by the air conditioner.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

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

The invention also provides a control method of the single-cooling type air conditioner.

The single cooling type air conditioner according to an embodiment of the present invention includes: the double-cylinder compressor comprises a shell, a first cylinder, a second cylinder and a first liquid storage device, wherein an exhaust port is formed in the shell, the first cylinder and the second cylinder are respectively arranged in the shell, the first liquid storage device is arranged outside the shell, an air suction port of the first cylinder is communicated with the first liquid storage device, and the value range of the exhaust volume ratio of the second cylinder to the first cylinder is 1-10%; the first end of the outdoor heat exchanger is connected with the air exhaust port, and the first end of the indoor heat exchanger is connected with the first liquid storage device; the gas-liquid separator comprises a gas outlet, a first interface and a second interface, the gas outlet is connected with a gas suction port of the second cylinder, the first interface is connected with the second end of the outdoor heat exchanger, the second interface is connected with the second end of the indoor heat exchanger, a first throttling element with adjustable opening degree is connected between the first interface and the outdoor heat exchanger in series, and a second throttling element with adjustable opening degree is connected between the second interface and the indoor heat exchanger in series; and the refrigerant radiator is used for radiating the electric control element and is connected in series between the gas outlet and the air suction port of the second cylinder.

According to the single-cooling type air conditioner provided by the embodiment of the invention, the double-cylinder compressor is arranged, so that the energy efficiency of the air conditioner can be effectively improved, the energy conservation and emission reduction can be effectively promoted, meanwhile, the gas-liquid separator is arranged, the heat exchange efficiency can be improved, the compression power consumption of the compressor can be reduced, the capacity and the energy efficiency of the air conditioner can be further improved, and the electric control element can be effectively cooled by arranging the refrigerant radiator.

In some embodiments of the invention, the first throttling element is an electronic expansion valve and the second throttling element is an electronic expansion valve.

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

In some embodiments of the present invention, the single cooling type air conditioner further includes a first control valve and a second control valve, the first control valve is connected in series with the refrigerant radiator, and the first control valve and the refrigerant radiator connected in series are connected in parallel with the second control valve.

In some embodiments of the present invention, the two-cylinder compressor further comprises a second accumulator disposed outside the housing, the second accumulator being connected in series between the gas outlet and the suction port of the second cylinder.

Preferably, the volume of the first reservoir is greater than the volume of the second reservoir.

According to the control method of the single-cooling type air conditioner provided by the embodiment of the invention, the single-cooling type air conditioner is the single-cooling type air conditioner provided by the embodiment of the invention, and the control method comprises the following steps: firstly, adjusting the opening degree of a first throttling element to a set opening degree according to a detection result of a first detection object, and then adjusting the opening degree of a second throttling element to a set opening degree according to a detection result of a second detection object, wherein the set opening degree of the first throttling element is smaller than the set opening degree of the second throttling element, and the detection result of the first detection object is different from the detection result of the second detection object; the first detection object comprises at least one of outdoor environment temperature, operating frequency of the double-cylinder compressor, exhaust temperature of an exhaust port, exhaust pressure of the exhaust port, intermediate pressure of a refrigerant discharged from the gas outlet and intermediate temperature of the refrigerant discharged from the gas outlet; the second detection object comprises at least one of outdoor environment temperature, operating frequency of the double-cylinder compressor, exhaust temperature of the exhaust port, exhaust pressure of the exhaust port, intermediate pressure of the refrigerant discharged from the gas outlet and intermediate temperature of the refrigerant discharged from the gas outlet.

According to the control method of the single-cooling type air conditioner, disclosed by the embodiment of the invention, the opening degree of the first throttling element is adjusted firstly, and then the opening degree of the second throttling element is adjusted, so that the energy efficiency of the system is optimized.

In some embodiments of the present invention, the first detection object and the second detection object are both an outdoor ambient temperature T4 and an operating frequency F, set opening degrees of the first throttling element and the second throttling element are calculated according to the detected outdoor ambient temperature T4 and the operating frequency F, and then the opening degrees of the corresponding first throttling element and the second throttling element are adjusted according to the set opening degrees.

In some embodiments of the present invention, the first detection object is an outdoor ambient temperature T4 and an operating frequency F, a set opening degree of a first throttling element is firstly calculated according to the outdoor ambient temperature T4 and the operating frequency F, and then the opening degree of the first throttling element is adjusted according to the set opening degree; the second detection object is outdoor environment temperature T4, operation frequency F and exhaust pressure; or the second detection object is the outdoor environment temperature T4, the operation frequency F and the exhaust temperature, firstly, the set exhaust pressure or the set exhaust temperature is obtained through calculation according to the outdoor environment temperature T4 and the operation frequency F, and then the opening degree of the second throttling element is adjusted according to the actually detected exhaust pressure or the actually detected exhaust temperature so that the detected exhaust pressure or the detected exhaust temperature reaches the set exhaust pressure or the set exhaust temperature.

In some embodiments of the present invention, a plurality of outdoor temperature intervals are preset, each of the outdoor temperature intervals corresponds to a different opening degree of the throttling element, the first detection object is an outdoor environment temperature T4, and the opening degree of the first throttling element is adjusted according to an opening degree value corresponding to an outdoor temperature interval where an actually detected outdoor environment temperature T4 is located; the second detection object is outdoor environment temperature T4, operation frequency F and exhaust pressure; or the second detection object is the outdoor environment temperature T4, the operation frequency F and the exhaust temperature, firstly, the set exhaust pressure or the set exhaust temperature is obtained through calculation according to the outdoor environment temperature T4 and the operation frequency F, and then the opening degree of the second throttling element is adjusted according to the actually detected exhaust pressure or the actually detected exhaust temperature so that the detected exhaust pressure or the detected exhaust temperature reaches the set exhaust pressure or the set exhaust temperature.

In some embodiments of the present invention, an intermediate temperature or an intermediate pressure is preset, the first detection object is the intermediate pressure or the intermediate temperature, and the opening degree of the first throttling element is adjusted according to the actually detected intermediate pressure or the intermediate temperature so that the detected intermediate pressure or the intermediate temperature reaches the preset intermediate pressure or the preset intermediate temperature; the second detection object is outdoor environment temperature T4, operation frequency F and exhaust pressure; or the second detection object is the outdoor environment temperature T4, the operation frequency F and the exhaust temperature, firstly, the set exhaust pressure or the set exhaust temperature is obtained through calculation according to the outdoor environment temperature T4 and the operation frequency F, and then the opening degree of the second throttling element is adjusted according to the actually detected exhaust pressure or the actually detected exhaust temperature so that the detected exhaust pressure or the detected exhaust temperature reaches the set exhaust pressure or the set exhaust temperature.

In some embodiments of the present invention, an intermediate temperature or an intermediate pressure is preset, the first detection object is the intermediate pressure or the intermediate temperature, and the opening degree of the first throttling element is adjusted according to the actually detected intermediate pressure or the intermediate temperature so that the detected intermediate pressure or the intermediate temperature reaches the preset intermediate pressure or the preset intermediate temperature; the second detection object is the outdoor environment temperature T4 and the operation frequency F, firstly, the set opening degree of the second throttling element is obtained through calculation according to the outdoor environment temperature T4 and the operation frequency F, and then the opening degree of the second throttling element is adjusted according to the set opening degree.

In some embodiments of the present invention, a plurality of outdoor temperature intervals are preset, each of the outdoor temperature intervals corresponds to a different opening degree of the throttling element, the first detection object is an outdoor environment temperature T4, and the opening degree of the first throttling element is adjusted according to an opening degree value corresponding to an outdoor temperature interval where an actually detected outdoor environment temperature T4 is located; the second detection object is the outdoor environment temperature T4 and the operation frequency F, firstly, the set opening degree of the second throttling element is obtained through calculation according to the outdoor environment temperature T4 and the operation frequency F, and then the opening degree of the second throttling element is adjusted according to the set opening degree.

Drawings

Fig. 1 is a schematic view of a single cooling type air conditioner according to an embodiment of the present invention;

fig. 2 is a schematic view of a single cooling type air conditioner according to another embodiment of the present invention;

fig. 3 is a schematic view of a single cooling type air conditioner provided with a second accumulator according to an embodiment of the present invention;

fig. 4 is a schematic view of a single cooling type air conditioner provided with a second accumulator according to another embodiment of the present invention;

FIG. 5 is a schematic view of a dual cylinder compressor according to an embodiment of the present invention;

fig. 6 is a flowchart illustrating a control method for cooling a single cooling type air conditioner according to an embodiment of the present invention.

Reference numerals:

a single-cooling type air conditioner 100,

The double-cylinder compressor comprises a double-cylinder compressor 1, a shell 10, a first air cylinder 11, a second air cylinder 12, a first liquid storage device 13, a second liquid storage device 14, an exhaust port 15,

An outdoor heat exchanger 3, an indoor heat exchanger 4,

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

A first throttling element 6, a second throttling element 7,

A first control valve 8, a refrigerant radiator 9,

A second control valve 20.

Detailed Description

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

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

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

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The single cooling type air conditioner 100 according to the embodiment of the present invention, in which the single cooling type air conditioner 100 has a cooling mode, is described in detail with reference to fig. 1 to 5.

As shown in fig. 1 to 5, a single cooling type air conditioner 100 according to an embodiment of the present invention includes: the double-cylinder compressor comprises a double-cylinder compressor 1, an outdoor heat exchanger 3, an indoor heat exchanger 4, a gas-liquid separator 5, a first throttling element 6, a second throttling element 7 and a refrigerant radiator 9. The double-cylinder compressor 1 comprises a shell 10, a first cylinder 11, a second cylinder 12 and a first liquid storage device 13, wherein an exhaust port 15 is formed in the shell 10, the first cylinder 11 and the second cylinder 12 are respectively arranged in the shell 10, the first liquid storage device 13 is arranged outside the shell 10, and an air suction port of the first cylinder 11 is communicated with the first liquid storage device 13. That is, the first cylinder 11 and the second cylinder 12 perform independent compression processes, 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 discharged from the discharge port 15, respectively.

The value of the ratio of the exhaust volumes of the second cylinder 12 and the first cylinder 11 ranges from 1% to 10%. Further, the range of the ratio of the exhaust volumes of the second cylinder 12 and the first cylinder 11 is 1% to 9%, and preferably, the range of the ratio of the exhaust volumes of the second cylinder 12 and the first cylinder 11 is 4% to 9%. For example, the ratio of the exhaust volumes of the second cylinder 12 and the first cylinder 11 may be 4%, 5%, 8%, or 8.5%.

A first end of the outdoor heat exchanger 3 is connected to the discharge port 15, and a first end of the indoor heat exchanger 4 is connected to the first accumulator 13. The gas-liquid separator 5 comprises a gas outlet m, a first interface f and a second interface g, the gas outlet m is connected with a gas suction port of the second cylinder 12, the first interface f is connected with the second end of the outdoor heat exchanger 3, the second interface g is connected with the second end of the indoor heat exchanger 4, a first throttling element 6 with adjustable opening degree is connected between the first interface f and the outdoor heat exchanger 3 in series, and a second throttling element 7 with adjustable opening degree is connected between the second interface g and the indoor heat exchanger 4 in series. Alternatively, the first throttling element 6 is an electronic expansion valve, and the second throttling element 7 is an electronic expansion valve, but it is understood that both the first throttling element 6 and the second throttling element 7 can be other adjustable opening components, such as a thermal expansion valve.

The refrigerant radiator 9 is used for radiating heat of the electric control element, and the refrigerant radiator 9 is connected in series between the gas outlet m and the suction port of the second cylinder 12. It is to be understood that the structure of the refrigerant radiator 9 may be various as long as the refrigerant can flow, and for example, the refrigerant radiator 9 may include a metal pipe extending in a meandering manner.

When the single-cooling type air conditioner 100 is used for refrigeration, high-temperature and high-pressure refrigerants discharged from an exhaust port 15 of the double-cylinder compressor 1 are discharged into the outdoor heat exchanger 3 for condensation and heat dissipation, liquid refrigerants discharged from the outdoor heat exchanger 3 are subjected to primary throttling and pressure reduction through the first throttling element 6 and then are discharged into the gas-liquid separator 5 through the first interface f for gas-liquid separation, separated intermediate-pressure gaseous refrigerants are discharged into the refrigerant radiator 9 through the gas outlet m for heat exchange with the electric control element, the purpose of heat dissipation of the electric control element is achieved, and refrigerants discharged from the refrigerant radiator 9 are discharged into the second air cylinder 12 for compression.

The intermediate pressure liquid refrigerant discharged from the second port g of the gas-liquid separator 5 is subjected to secondary throttling and pressure reduction by the second throttling element 7, and then discharged into the indoor heat exchanger 4 for heat exchange so as to reduce the indoor environment temperature, the refrigerant discharged from the indoor heat exchanger 4 is discharged into the first reservoir 13, and the refrigerant discharged from the first reservoir 13 is discharged into the first cylinder 11 for compression.

From this analysis, when the single-cooling air conditioner 100 operates, the refrigerants in different pressure states enter the first cylinder 11 and the second cylinder 12 respectively, the first cylinder 11 and the second cylinder 12 independently complete the compression process, the compressed refrigerant discharged from the first cylinder 11 and the compressed refrigerant discharged from the second cylinder 12 are discharged into the shell 10 to be mixed and then discharged from the exhaust port 15, and meanwhile, as the value range of the exhaust volume ratio of the second cylinder 12 to the first cylinder 11 is 1% -10%, the refrigerant with a small flow rate and a high pressure state is discharged into the second cylinder 12 with a small exhaust volume to be compressed, the energy efficiency can be improved, and energy conservation and emission reduction can be achieved.

Meanwhile, the gas-liquid separator 5 is arranged between the outdoor heat exchanger 3 and the indoor heat exchanger 4, so that the gas-liquid separator 5 separates out a part of gaseous refrigerant and then discharges the part of gaseous refrigerant back to the second cylinder 12 for compression, the gas content in the refrigerant flowing into the indoor heat exchanger 4 during refrigeration is reduced, the influence of the gaseous refrigerant on the heat exchange performance of the indoor heat exchanger 4 serving as an evaporator is reduced, the heat exchange efficiency can be improved, and the compression power consumption of the compressor is reduced.

According to the single-cooling type air conditioner 100 provided by the embodiment of the invention, the double-cylinder compressor 1 is arranged, so that the energy efficiency of the air conditioner can be effectively improved, the energy conservation and emission reduction can be effectively promoted, meanwhile, the gas-liquid separator 5 is arranged, the heat exchange efficiency can be improved, the compression power consumption of the compressor can be reduced, the capacity and the energy efficiency of the air conditioner can be further improved, and the refrigerant radiator 9 is arranged, so that the electric control element can be effectively cooled.

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

In some embodiments of the present invention, as shown in fig. 3 and 4, the two-cylinder compressor 1 further includes a second accumulator 14 disposed outside the housing 10, the second accumulator 14 being connected in series between the gas outlet m and the suction port of the second cylinder 12. Therefore, the second liquid storage device 14 is arranged, the refrigerant discharged from the gas outlet m of 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, so that the liquid impact phenomenon of the double-cylinder compressor 1 is avoided, and the service life of the double-cylinder compressor 1 is prolonged.

In a further embodiment of the invention, the volume of the first reservoir 13 is larger than the volume of the second reservoir 14. Thus, the volume of the second accumulator 14 can be made small while ensuring the compression amount of the second cylinder 12, thereby reducing the cost. Preferably, the volume of the second reservoir 14 is no more than one-half of the volume of the first reservoir 13.

As shown in fig. 2 and 4, in some embodiments of the present invention, the single cooling type air conditioner 100 further includes a first control valve 8 and a second control valve 20, the first control valve 8 is connected in series with the refrigerant radiator 9, and the first control valve 8 and the refrigerant radiator 9 connected in series are connected in parallel with the second control valve 20. Specifically, the first control valve 8 and the second control valve 9 may be solenoid valves, respectively.

When the refrigerant radiator 9 is required to radiate heat to the electric control element, the first control valve 8 is opened and the second control valve 20 is closed, and gaseous refrigerant discharged from the gas outlet m of the gas-liquid separator 5 is discharged into the refrigerant radiator 9 through the first control valve 8 to exchange heat with the electric control element. When the refrigerant radiator 9 is not needed to dissipate heat of the electric control element, the first control valve 8 is closed and the second control valve 20 is opened, and the gaseous refrigerant discharged from the gas outlet m of the gas-liquid separator 5 is directly discharged into the second cylinder 12 through the second control valve 20 to be compressed, so that whether the refrigerant radiator 9 is adopted to dissipate heat of the electric control element can be selected according to needs, and the automation degree of the single-cooling type air conditioner 100 is improved.

Meanwhile, when the liquid refrigerant in the gas-liquid separator 5 exceeds the safe liquid level, the liquid refrigerant can be prevented from entering the second cylinder 12 by closing the first control valve 8 and the second control valve 20, so that liquid impact of the double-cylinder compressor 1 can be avoided, and the service life of the double-cylinder compressor 1 is prolonged. Further, a liquid level sensor may be provided in the gas-liquid separator 5, and the first control valve 8 and the second control valve 20 may be controlled to be closed by the detection result of the liquid level sensor.

The inventor compares the energy efficiency of the single-cooling type air conditioner according to the above-described embodiment of the present invention (the rated cooling capacity is set to 3.5kw, and the exhaust volume ratio of the second cylinder to the first cylinder is set to 7.6%) under different operating conditions with the energy efficiency of the conventional single-cooling type air conditioner under the same operating condition, and obtains the following data:

test conditions	Energy efficiency of prior art solutions	Energy efficiency of the technical scheme of the invention	Increasing the ratio
				Rated refrigeration	3.93	4.26	8.40％
Intermediate refrigeration	5.88	6.18	5.10％
				APF	4.61	4.92	6.72％

Therefore, compared with the existing single-cooling type compressor, the single-cooling type air conditioner provided by the embodiment of the invention has the advantages that the energy efficiency of each working condition and the annual energy efficiency APF are obviously improved.

Meanwhile, the inventor compares the single-cooling type air conditioner of the embodiment of the invention with different rated refrigerating capacity and different exhaust volume ratio with the single-cooling type air conditioner under the same working condition, and finds that the energy efficiency is improved, for example, the inventor finds that the single-cooling type air conditioner of the embodiment of the invention (the rated refrigerating capacity is set to be 2.6kw, and the exhaust volume ratio of the second cylinder to the first cylinder is set to be 9.2%) has the energy efficiency improved by 7.3% compared with the single-cooling type air conditioner under the same working condition.

A control method of a single cooling type air conditioner according to an embodiment of the present invention, which is the above-described embodiment of the present invention, will be described in detail with reference to fig. 1 to 6.

The control method according to the embodiment of the invention comprises the following steps: the opening degree of the first throttling element is adjusted according to the detection result of the first detection object, then the opening degree of the second throttling element is adjusted according to the detection result of the second detection object, the set opening degree of the first throttling element is smaller than the set opening degree of the second throttling element, and the detection result of the first detection object is different from the detection result of the second detection object. It should be noted that the detection result of the first detection object being different from the detection result of the second detection object means that the first throttling element and the second throttling element cannot be simultaneously subjected to adjustment control using the same state parameter, in other words, the correlation parameter required for adjusting the first throttling element is different from the correlation parameter required for adjusting the second throttling element.

The first detection object comprises at least one of outdoor environment temperature, operating frequency of the double-cylinder compressor, exhaust temperature of the exhaust port, exhaust pressure of the exhaust port, intermediate pressure of a refrigerant discharged from the gas outlet and intermediate temperature of the refrigerant discharged from the gas outlet. The second detection object comprises at least one of outdoor environment temperature, operation frequency of the double-cylinder compressor, exhaust temperature of the exhaust port, exhaust pressure of the exhaust port, intermediate pressure of the refrigerant discharged from the gas outlet and intermediate temperature of the refrigerant discharged from the gas outlet.

That is, as shown in fig. 6, when the single cooling type air conditioner is operated, the parameters required for controlling the first throttling element and the second throttling element are acquired, processed and controlled, then according to the obtained parameters, the opening degree of the first throttling element is firstly adjusted to the set opening degree, then the opening degree of the second throttling element is adjusted to the set opening degree, and when the first throttling element and the second throttling element are both adjusted to the set opening degree, the opening degree of the first throttling element is smaller than the opening degree of the second throttling element. It will of course be appreciated that the steps of acquiring a parameter required to control the first restriction element and acquiring a parameter required to control the second restriction element may be performed simultaneously or sequentially.

After the opening degree of the first throttling element and the opening degree of the second throttling element both meet the condition, the first detection object and the second detection object can be detected again after the operation is performed for n seconds, then the opening degrees of the first throttling element and the second throttling element are adjusted according to the detection result, and the steps are repeated. Of course, the repetition condition is not limited to this, and for example, the first detection object and the second detection object may be newly detected after receiving an operation instruction from a user, and then the opening degrees of the first throttling element and the second throttling element may be adjusted according to the detection result. In other words, in cooling, after the opening degrees of the first throttling element and the second throttling element both satisfy the condition, the judgment can be re-detected for the parameters related to the opening degrees of the first throttling element and the second throttling element after the operation for n seconds or after the operation signal of the user is received, and then the opening degrees of the first throttling element and the second throttling element are adjusted according to the judgment result, and the steps are repeated.

According to the control method of the single-cooling type air conditioner, disclosed by the embodiment of the invention, the opening degree of the first throttling element is adjusted firstly, and then the opening degree of the second throttling element is adjusted, so that the energy efficiency of the system is optimized.

The following describes a control method according to several embodiments of the present invention.

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, the set opening degrees of the first throttling element and the second throttling element are calculated according to the detected outdoor ambient temperature T4 and the operating frequency F, and then the opening degrees of the corresponding first throttling element and the second throttling element are adjusted according to the set opening degrees.

It can be understood that the calculation formula is preset in the electric control element of the single-cooling type air conditioner, and the calculation formula can be specifically limited according to the actual situation.

Specifically, during cooling, the relationship among the opening LA _ cool _1 of the first throttling element, the outdoor ambient temperature T4 and the operating frequency F is as follows: LA _ cool _1 ═ a₁·F+b₁T₄+c₁When the calculated opening LA _ cool _1 is larger than the collected actual opening of the first throttling element, increasing the opening of the first throttling element to the calculated opening; otherwise, it is turned down.

The relationship between the opening LA _ cool _2 of the second throttling element and the outdoor ambient temperature T4 and the operating frequency F is: LA _ cool _2 ═ a₂·F+b₂T₄+c₂When the calculated opening LA _ cool _2 is larger than the collected actual opening of the second throttling element, increasing the opening of the second throttling element to the calculated opening; otherwise, it is turned down. Wherein, a is more than or equal to 0₁≤20，0≤b₁≤20，-50≤c₁≤100；0≤a₂≤30，0≤b₂≤30，-50≤c₂≤1The 50 control coefficients a, b and c can be all 0, and when any one coefficient is zero, the parameter corresponding to the coefficient is proved to have no influence on the opening degree of the throttling element.

For example, in the case of refrigeration, the outdoor ambient temperature is detected to be 35 ℃, the compressor operating frequency is 58Hz, and the setting a₁＝1,b₁＝1.6,c₁＝6；a₂＝1.5,b₂＝1.6,c₂17. Firstly, the system calculates that the opening degree of a first throttling element is 120 according to the collected frequency and a T4 value, and adjusts the opening degree of the first throttling element to 120; the opening of the second throttling element is then calculated to be 160 and adjusted to 160. After the opening degrees of the two throttling elements are maintained for 200s, the running frequency and the T4 value of the compressor are detected again; or the first throttling element and the second throttling element are readjusted according to the adjustment of the air conditioner by the user, the running frequency of the compressor and the T4 value are detected.

According to the adjustment mode, the energy efficiency of the whole air conditioner is 6.5% higher than that of the air conditioner with the same specification in the market at present.

Example 2:

in the embodiment, the first detection object is the outdoor environment temperature T4 and the operation frequency F, firstly, the set opening degree of the first throttling element is calculated according to the outdoor environment temperature T4 and the operation frequency F, and then the opening degree of the first throttling element is adjusted according to the set opening degree;

the second detection object is the outdoor ambient temperature T4, the operating frequency F and the discharge pressure; or the second detection object is the outdoor environment temperature T4, the operation frequency F and the exhaust temperature, the set exhaust pressure or the set exhaust temperature is firstly calculated according to the outdoor environment temperature T4 and the operation frequency F, and then the opening degree of the second throttling element is adjusted according to the actually detected exhaust pressure or the actually detected exhaust temperature so that the detected exhaust pressure or the detected exhaust temperature reaches the set exhaust pressure or the set exhaust temperature.

In particular, the amount of the solvent to be used,during cooling, the relation among the opening LA _ cool _1 of the first throttling element, the outdoor environment temperature T4 and the operating frequency F is as follows: LA _ cool _1 ═ a₁·F+b₁T₄+c₁When the calculated opening LA _ cool _1 is larger than the collected actual opening of the first throttling element, increasing the opening of the first throttling element to the calculated opening; otherwise, it is turned down.

When the second detection object includes the discharge air temperature, the relation between the discharge air temperature TP and the outdoor ambient temperature T4 and the operating frequency F is: TP _ cool ═ a₂·F+b₂T₄+c₂When the second detection object includes the discharge pressure, the relation between the discharge pressure pdet, the outdoor ambient temperature T4 and the operating frequency F is: p line _ cool ═ a₃·F+b₃T₄+c₃When the collected exhaust temperature or exhaust pressure is higher than the calculated set exhaust temperature or set exhaust pressure, the opening degree of the second throttling element is increased; otherwise, it is turned down. Wherein 0 is more than or equal to a₁≤20，0≤b₁≤20，-50≤c₁≤100，0≤a₂≤30，0≤b₂≤30，-50≤c₂≤150，0≤a₃≤30，0≤b₃≤30，-50≤c₃Less than or equal to 150. The control coefficients a, b and c can be all 0, and when any one coefficient is zero, the parameter corresponding to the coefficient is proved to have no influence on the opening degree of the throttling element.

For example, in the case of refrigeration, the outdoor ambient temperature is detected to be 35 ℃, the compressor operating frequency is 58Hz, and the setting a₁＝1,b₁＝1.6,c₁＝6；a₂＝0.5,b₂＝0.4,c₂＝31；a₃＝0.25,b₃＝0.2,c₂3.9. Firstly, the system calculates that the opening degree of a first throttling element is 120 according to the collected frequency and a T4 value, the opening degree of the first throttling element is adjusted to 120, then the system calculates that the exhaust temperature TP _ cool corresponding to a second throttling element is 74 ℃ or the exhaust pressure P _ cool is 2.54MPa according to the collected frequency and a T4 value, at the moment, the opening degree of the second throttling element is adjusted according to the detected exhaust temperature TP or the detected exhaust pressure P, and when the detected exhaust temperature TP or the detected exhaust pressure P is detectedWhen the exhaust temperature is higher than 74 ℃ (or the detected exhaust pressure P is higher than 2.54Mpa), the opening degree of the second throttling element is gradually increased (4 steps of actions can be adjusted every time). After the opening degrees of the two throttling elements are maintained for 200s, the operation frequency of the compressor and the value of T4 are detected again, or the operation frequency of the compressor and the value of T4 are detected according to the adjustment of the air conditioner by a user, and the first throttling element and the second throttling element are adjusted again.

According to the adjustment mode, the energy efficiency of the whole air conditioner is 6.5% higher than that of the air conditioner with the same specification in the market at present.

Example 3:

in the embodiment, a plurality of outdoor temperature intervals are preset, each outdoor temperature interval corresponds to different opening degrees of the throttling element, the first detection object is an outdoor environment temperature T4, and the opening degree of the first throttling element is adjusted according to the opening degree value corresponding to the outdoor temperature interval where the outdoor environment temperature T4 is actually detected;

the second detection object is the outdoor ambient temperature T4, the operating frequency F and the discharge pressure; or the second detection object is the outdoor environment temperature T4, the operation frequency F and the exhaust temperature, the set exhaust pressure or the set exhaust temperature is firstly calculated according to the outdoor environment temperature T4 and the operation frequency F, and then the opening degree of the second throttling element is adjusted according to the actually detected exhaust pressure or the exhaust temperature so that the detected exhaust pressure or the exhaust temperature reaches the set exhaust pressure or the set exhaust temperature.

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

T4	opening degree
		10≤T4＜20	100
20≤T4＜30	110
		30≤T4＜40	120
40≤T4＜50	150
		50≤T4＜60	180

When the second detection object includes the discharge air temperature, the relation between the discharge air temperature TP and the outdoor ambient temperature T4 and the operating frequency F is: TP _ cool ═ a₁·F+b₁T₄+c₁When the second detection object includes the discharge pressure, the relation between the discharge pressure pdet, the outdoor ambient temperature T4 and the operating frequency F is: p line _ cool ═ a₂·F+b₂T₄+c₂When the collected exhaust temperature or exhaust pressure is higher than the calculated set exhaust temperature or set exhaust pressure, the opening degree of the second throttling element is increased; otherwise, it is turned down. Wherein 0 is more than or equal to a₁≤20，0≤b₁≤20，-50≤c₁≤100，0≤a₂≤30，0≤b₂≤30，-50≤c₂Less than or equal to 150. The control coefficients a, b and c can be all 0, and when any one coefficient is zero, the parameter corresponding to the coefficient is proved to have no influence on the opening degree of the throttling element.

For example, the outdoor environment temperature is detected to be 35 ℃ during refrigeration, the running frequency of the compressor is 58Hz,setting a₁＝0.5,b₁＝0.4,c₁＝31；a₂＝0.25,b₂＝0.2,c₂3.9. Firstly, the system obtains that the opening degree of a first throttling element is 120 according to the collected outdoor environment temperature T4, and adjusts the opening degree of the first throttling element to 120; then the system calculates the exhaust temperature TP _ cool corresponding to the second throttling element to be 74 ℃ or the exhaust pressure Prow _ cool to be 2.54MPa according to the frequency and the value T4, and then the opening degree of the second throttling element is adjusted according to the detected exhaust temperature TP or the detected exhaust pressure P, for example, when the detected exhaust temperature is higher than 74 ℃ (or the detected exhaust pressure Prow is higher than 2.54MPa), the opening degree of the second throttling element is gradually increased (4 steps of actions can be adjusted each time). After the opening degrees of the two throttling elements are maintained for 200s, the operation frequency of the compressor and the value of T4 are detected again, or the operation frequency of the compressor and the value of T4 are detected according to the adjustment of the air conditioner by a user, and the first throttling element and the second throttling element are adjusted again.

According to the adjustment mode, the energy efficiency of the whole air conditioner is 6.5% higher than that of the air conditioner with the same specification in the market at present.

Example 4:

in this embodiment, an intermediate temperature or an intermediate pressure is preset, the first detection object is the intermediate pressure or the intermediate temperature, and the opening degree of the first throttling element is adjusted according to the actually detected intermediate pressure or the intermediate temperature so that the detected intermediate pressure or the intermediate temperature reaches the preset intermediate pressure or the preset intermediate temperature.

The second detection object is the outdoor ambient temperature T4, the operating frequency F and the discharge pressure; or the second detection object is the outdoor environment temperature T4, the operation frequency F and the exhaust temperature, the set exhaust pressure or the set exhaust temperature is firstly calculated according to the outdoor environment temperature T4 and the operation frequency F, and then the opening degree of the second throttling element is adjusted according to the actually detected exhaust pressure or the exhaust temperature so that the detected exhaust pressure or the detected exhaust temperature reaches the set exhaust pressure or the set exhaust temperature.

Specifically, during refrigeration, the preset intermediate temperature can be 20-35 ℃, and the preset intermediate pressure can be 0.8-2.0 MPa. When the intermediate pressure or the intermediate temperature is detected to be lower than the set value, the opening degree of the first throttling element is increased, and the opening degree of the first throttling element is decreased.

When the second detection object includes the discharge air temperature, the relation between the discharge air temperature TP and the outdoor ambient temperature T4 and the operating frequency F is: TP _ cool ═ a₁·F+b₁T₄+c₁When the second detection object includes the discharge pressure, the relation between the discharge pressure pdet, the outdoor ambient temperature T4 and the operating frequency F is: p line _ cool ═ a₂·F+b₂T₄+c₂When the collected exhaust temperature or exhaust pressure is higher than the calculated set exhaust temperature or set exhaust pressure, the opening degree of the second throttling element is increased; otherwise, it is turned down. Wherein 0 is more than or equal to a₁≤20，0≤b₁≤20，-50≤c₁≤100，0≤a₂≤30，0≤b₂≤30，-50≤c₂Less than or equal to 150. The control coefficients a, b and c can be all 0, and when any one coefficient is zero, the parameter corresponding to the coefficient is proved to have no influence on the opening degree of the throttling element.

For example, in the case of cooling, the intermediate temperature is set to 26 ℃ or the intermediate pressure is set to 1.65MPa, the outdoor ambient temperature is detected to be 35 ℃, the compressor operating frequency is 58Hz, and a is set₁＝0.5,b₁＝0.4,c₁＝31；a₂＝0.25,b₂＝0.2,c₂3.9. Firstly, the system adjusts the opening degree of the first throttling element according to the acquired intermediate temperature or intermediate pressure value. When the collected intermediate temperature is higher than 26 ℃ or the collected intermediate pressure is higher than 1.65MPa, the opening degree of the first throttling element is gradually reduced (4 steps of actions can be regulated at each time). Otherwise, the opening degree is reduced. Then the system calculates the exhaust temperature TP _ cool corresponding to the second throttling element to be 74 ℃ or the exhaust pressure Prow _ cool to be 2.54MPa according to the frequency and the value T4, and then the system calculates the exhaust temperature TP _ cool corresponding to the second throttling element to be 74 ℃ or the exhaust pressure Prow _ cool according to the detected exhaust temperature TP or the exhaust pressureAnd P, adjusting the opening degree of the second throttling element, and gradually increasing the opening degree of the second throttling element (4 steps of actions can be adjusted every time) when the exhaust temperature is detected to be higher than 74 ℃ (or the detected pressure P is higher than 2.54 Mpa). After the opening degrees of the two throttling elements are maintained for 200s, the operation frequency of the compressor and the value of T4 are detected again, or the operation frequency of the compressor and the value of T4 are detected according to the adjustment of the air conditioner by a user, and the first throttling element and the second throttling element are adjusted again.

According to the adjustment mode, the energy efficiency of the whole air conditioner is 6.5% higher than that of the air conditioner with the same specification in the market at present.

Example 5:

in this embodiment, an intermediate temperature or an intermediate pressure is preset, the first detection object is the intermediate pressure or the intermediate temperature, and the opening degree of the first throttling element is adjusted according to the actually detected intermediate pressure or the intermediate temperature so that the detected intermediate pressure or the detected intermediate temperature reaches the preset intermediate pressure or the preset intermediate temperature;

the second detection object is the outdoor environment temperature T4 and the operation frequency F, firstly, the set opening degree of the second throttling element is obtained through calculation according to the outdoor environment temperature T4 and the operation frequency F, and then the opening degree of the second throttling element is adjusted according to the set opening degree.

Specifically, the preset intermediate temperature range during refrigeration can be 20-35 ℃, and the preset intermediate pressure range can be 0.8-1.5 MPa. When the intermediate pressure or the temperature is detected to be lower than the set value, the opening degree of the first throttling element is opened, and the opening degree is closed.

The relationship between the opening LA _ cool _2 of the second throttling element and the outdoor ambient temperature T4 and the operating frequency F is: LA _ cool _2 ═ a₂·F+b₂T₄+c₂When the calculated opening LA _ cool _2 is larger than the collected actual opening of the second throttling element, increasing the opening of the second throttling element to the calculated opening; otherwise, it is turned down. Wherein,0≤a₂≤30，0≤b₂≤30，-50≤c₂and (4) less than or equal to 150, wherein the control coefficients a, b and c can be 0, and when any one coefficient is zero, the parameter corresponding to the coefficient is proved to have no influence on the opening degree of the throttling element.

For example, in the case of cooling, the intermediate temperature is set to 26 ℃ or the intermediate pressure is set to 1.65MPa, the outdoor ambient temperature is detected to be 35 ℃, the compressor operating frequency is 58Hz, and a is set₂＝1.5,b₂＝1.6,c₂17. Firstly, the system adjusts the opening degree of the first throttling element according to the acquired intermediate temperature or intermediate pressure value. When the collected intermediate temperature is higher than 26 ℃ or the collected intermediate pressure is higher than 1.65MPa, the opening degree of the first throttling element is gradually reduced (4 steps of actions can be regulated at each time). Otherwise, the opening degree is reduced. The system then calculates the set opening of the second throttling element to be 160 based on the sensed outdoor ambient temperature and the compressor operating frequency, and then adjusts the opening of the second throttling element to 160. After the opening degrees of the two throttling elements are maintained for 200s, the operation frequency of the compressor and the value of T4 are detected again, or the operation frequency of the compressor and the value of T4 are detected according to the adjustment of the air conditioner by a user, and the first throttling element and the second throttling element are adjusted again.

According to the adjustment mode, the energy efficiency of the whole air conditioner is 6.5% higher than that of the air conditioner with the same specification in the market at present.

Example 6:

in this embodiment, a plurality of outdoor temperature zones are preset, each outdoor temperature zone corresponds to a different opening degree of the throttling element, the first detection object is the outdoor environment temperature T4, and the opening degree of the first throttling element is adjusted according to the opening degree value corresponding to the outdoor temperature zone where the actually detected outdoor environment temperature T4 is located.

The second detection object is the outdoor environment temperature T4 and the operation frequency F, firstly, the set opening degree of the second throttling element is obtained through calculation according to the outdoor environment temperature T4 and the operation frequency F, and then the opening degree of the second throttling element is adjusted according to the set opening degree.

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

the relationship between the opening LA _ cool _2 of the second throttling element and the outdoor ambient temperature T4 and the operating frequency F is: LA _ cool _2 ═ a₂·F+b₂T₄+c₂When the calculated opening LA _ cool _2 is larger than the collected actual opening of the second throttling element, increasing the opening of the second throttling element to the calculated opening; otherwise, it is turned down. Wherein, a is more than or equal to 0₂≤30，0≤b₂≤30，-50≤c₂And (4) less than or equal to 150, wherein the control coefficients a, b and c can be 0, and when any one coefficient is zero, the parameter corresponding to the coefficient is proved to have no influence on the opening degree of the throttling element.

For example, in the cooling process, the outdoor environment temperature is detected to be 35 ℃, the compressor operation frequency is 58Hz, and the setting a₂＝1.5,b₂＝1.6,c₂17. Firstly, the system acquires the outdoor environment temperature T4, finds that the opening degree of the first throttling element should be 120, and adjusts the opening degree of the first throttling element to 120. The system then calculates the set opening of the second throttling element to be 160 based on the sensed outdoor ambient temperature and the compressor operating frequency, and then adjusts the opening of the second throttling element to 160. After the opening degrees of the two throttling elements are maintained for 200s, the operation frequency of the compressor and the value of T4 are detected again, or the operation frequency of the compressor and the value of T4 are detected according to the adjustment of the air conditioner by a user, and the first throttling element and the second throttling element are adjusted again.

According to the adjustment mode, the energy efficiency of the whole air conditioner is 6.5% higher than that of the air conditioner with the same specification in the market at present.

It is to be understood that the six embodiments described above are only specific example illustrations, the control method of the embodiment of the invention is not limited to the six embodiments described above, and for example, the adjustment manners of the opening degrees of the first throttling element and the second throttling element in the six embodiments may be randomly combined; or the compressor operating frequency in the above embodiment may also be obtained from the actually detected outdoor environment temperature, for example, a plurality of outdoor environment temperature intervals are preset, and the plurality of outdoor environment temperature intervals correspond to different compressor operating frequencies.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (13)

1. A single cooling type air conditioner, comprising:

the double-cylinder compressor comprises a shell, a first cylinder, a second cylinder and a first liquid storage device, wherein an exhaust port is formed in the shell, the first cylinder and the second cylinder are respectively arranged in the shell, the first liquid storage device is arranged outside the shell, an air suction port of the first cylinder is communicated with the first liquid storage device, and the value range of the exhaust volume ratio of the second cylinder to the first cylinder is 1-9%;

the first end of the outdoor heat exchanger is connected with the air exhaust port, and the first end of the indoor heat exchanger is connected with the first liquid storage device;

the gas-liquid separator comprises a gas outlet, a first interface and a second interface, the gas outlet is connected with a gas suction port of the second cylinder, the first interface is connected with the second end of the outdoor heat exchanger, the second interface is connected with the second end of the indoor heat exchanger, a first throttling element with adjustable opening degree is connected between the first interface and the outdoor heat exchanger in series, and a second throttling element with adjustable opening degree is connected between the second interface and the indoor heat exchanger in series;

the refrigerant radiator is used for radiating the electric control element and is connected in series between the gas outlet and the air suction port of the second cylinder; the electronic control element is configured to adjust an opening degree of the first throttle element to a set opening degree first according to a detection result of a first detection object, and then adjust an opening degree of the second throttle element to a set opening degree according to a detection result of a second detection object, the set opening degree of the first throttle element being smaller than the set opening degree of the second throttle element, the detection result of the first detection object being different from the detection result of the second detection object;

the first detection object comprises at least one of outdoor environment temperature, operating frequency of the double-cylinder compressor, exhaust temperature of an exhaust port, exhaust pressure of the exhaust port, intermediate pressure of a refrigerant discharged from the gas outlet and intermediate temperature of the refrigerant discharged from the gas outlet;

the second detection object comprises at least one of outdoor environment temperature, operating frequency of the double-cylinder compressor, exhaust temperature of the exhaust port, exhaust pressure of the exhaust port, intermediate pressure of the refrigerant discharged from the gas outlet and intermediate temperature of the refrigerant discharged from the gas outlet.

2. A single cold type air conditioner according to claim 1, wherein said first throttling element is an electronic expansion valve and said second throttling element is an electronic expansion valve.

3. The single cooling type air conditioner according to claim 1, wherein the volume of said gas-liquid separator is in a range of 100mL to 500 mL.

4. The single-cooling type air conditioner according to claim 1, further comprising a first control valve and a second control valve, wherein the first control valve is connected in series with the refrigerant radiator, and the first control valve and the refrigerant radiator connected in series are connected in parallel with the second control valve.

5. The single cold type air conditioner according to any one of claims 1 to 4, wherein said twin cylinder compressor further comprises a second accumulator provided outside said housing, said second accumulator being connected in series between said gas outlet and a suction port of said second cylinder.

6. The cooling-only type air conditioner according to claim 5, wherein a volume of said first accumulator is larger than a volume of said second accumulator.

7. A control method of a single cooling type air conditioner according to any one of claims 1 to 6, characterized by comprising the steps of: firstly, adjusting the opening degree of a first throttling element to a set opening degree according to a detection result of a first detection object, and then adjusting the opening degree of a second throttling element to a set opening degree according to a detection result of a second detection object, wherein the set opening degree of the first throttling element is smaller than the set opening degree of the second throttling element, and the detection result of the first detection object is different from the detection result of the second detection object;

the first detection object comprises at least one of outdoor environment temperature, operating frequency of the double-cylinder compressor, exhaust temperature of an exhaust port, exhaust pressure of the exhaust port, intermediate pressure of a refrigerant discharged from the gas outlet and intermediate temperature of the refrigerant discharged from the gas outlet;

the second detection object comprises at least one of outdoor environment temperature, operating frequency of the double-cylinder compressor, exhaust temperature of the exhaust port, exhaust pressure of the exhaust port, intermediate pressure of the refrigerant discharged from the gas outlet and intermediate temperature of the refrigerant discharged from the gas outlet.

8. The control method of a single cooling type air conditioner according to claim 7, wherein the first and second detection objects are outdoor ambient temperature T4 and operating frequency F, set opening degrees of the first and second throttling elements are calculated according to the detected outdoor ambient temperature T4 and operating frequency F, and then the opening degrees of the corresponding first and second throttling elements are adjusted according to the set opening degrees.

9. The control method of a single cooling type air conditioner according to claim 7, wherein the first detection object is an outdoor ambient temperature T4 and an operating frequency F, a set opening degree of a first throttling element is first calculated according to the outdoor ambient temperature T4 and the operating frequency F, and then the opening degree of the first throttling element is adjusted according to the set opening degree;

the second detection object is outdoor environment temperature T4, operation frequency F and exhaust pressure; or the second detection object is the outdoor environment temperature T4, the operation frequency F and the exhaust temperature, firstly, the set exhaust pressure or the set exhaust temperature is obtained through calculation according to the outdoor environment temperature T4 and the operation frequency F, and then the opening degree of the second throttling element is adjusted according to the actually detected exhaust pressure or the actually detected exhaust temperature so that the detected exhaust pressure or the detected exhaust temperature reaches the set exhaust pressure or the set exhaust temperature.

10. The control method of a single cooling type air conditioner according to claim 7, wherein a plurality of outdoor temperature sections are preset, each of the outdoor temperature sections corresponding to a different opening degree of the throttling element,

the first detection object is outdoor environment temperature T4, and the opening degree of the first throttling element is adjusted according to the actually detected opening degree value corresponding to the outdoor temperature interval where the outdoor environment temperature T4 is located;

the second detection object is outdoor environment temperature T4, operation frequency F and exhaust pressure; or the second detection object is the outdoor environment temperature T4, the operation frequency F and the exhaust temperature, firstly, the set exhaust pressure or the set exhaust temperature is obtained through calculation according to the outdoor environment temperature T4 and the operation frequency F, and then the opening degree of the second throttling element is adjusted according to the actually detected exhaust pressure or the actually detected exhaust temperature so that the detected exhaust pressure or the detected exhaust temperature reaches the set exhaust pressure or the set exhaust temperature.

11. The control method of a single cooling type air conditioner according to claim 7, wherein an intermediate temperature or a preset intermediate pressure is preset, the first detection object is the intermediate pressure or the intermediate temperature, and the opening degree of the first throttling element is adjusted according to the actually detected intermediate pressure or the intermediate temperature so that the detected intermediate pressure or the intermediate temperature reaches the preset intermediate pressure or the preset intermediate temperature;

the second detection object is outdoor environment temperature T4, operation frequency F and exhaust pressure; or the second detection object is the outdoor environment temperature T4, the operation frequency F and the exhaust temperature, firstly, the set exhaust pressure or the set exhaust temperature is obtained through calculation according to the outdoor environment temperature T4 and the operation frequency F, and then the opening degree of the second throttling element is adjusted according to the actually detected exhaust pressure or the actually detected exhaust temperature so that the detected exhaust pressure or the detected exhaust temperature reaches the set exhaust pressure or the set exhaust temperature.

12. The control method of a single cooling type air conditioner according to claim 7, wherein an intermediate temperature or a preset intermediate pressure is preset, the first detection object is the intermediate pressure or the intermediate temperature, and the opening degree of the first throttling element is adjusted according to the actually detected intermediate pressure or the intermediate temperature so that the detected intermediate pressure or the intermediate temperature reaches the preset intermediate pressure or the preset intermediate temperature;

the second detection object is the outdoor environment temperature T4 and the operation frequency F, firstly, the set opening degree of the second throttling element is obtained through calculation according to the outdoor environment temperature T4 and the operation frequency F, and then the opening degree of the second throttling element is adjusted according to the set opening degree.

13. The control method of a single cooling type air conditioner according to claim 7, wherein a plurality of outdoor temperature sections are preset, each of the outdoor temperature sections corresponding to a different opening degree of the throttling element,

the first detection object is outdoor environment temperature T4, and the opening degree of the first throttling element is adjusted according to the actually detected opening degree value corresponding to the outdoor temperature interval where the outdoor environment temperature T4 is located;

the second detection object is the outdoor environment temperature T4 and the operation frequency F, firstly, the set opening degree of the second throttling element is obtained through calculation according to the outdoor environment temperature T4 and the operation frequency F, and then the opening degree of the second throttling element is adjusted according to the set opening degree.