CN105737423A

CN105737423A - Cooling-heating air conditioner and control method thereof

Info

Publication number: CN105737423A
Application number: CN201610285225.5A
Authority: CN
Inventors: 刘湍顺; 李金波; 戚文端; 杨亚新; 陈明瑜; 任超; 孙兴
Original assignee: Midea Group Co Ltd; Guangdong Midea Refrigeration Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2016-04-29
Filing date: 2016-04-29
Publication date: 2016-07-06
Anticipated expiration: 2036-04-29
Also published as: CN105737423B

Abstract

The invention discloses a cooling-heating air conditioner and a control method thereof. The cooling-heating air conditioner comprises a two-cylinder compressor, a reversing assembly, an outdoor heat exchanger, an indoor heat exchanger, a gas-liquid separator and a refrigerant radiator, wherein the gas suction port of a first cylinder is communicated with a first reservoir; a displacement volume ratio of the second cylinder to the first cylinder is 1-10 percent; the reversing assembly comprises first to fourth valve ports; the fourth valve port is connected with the first reservoir; the gas-liquid separator comprises a gas outlet, a first interface and a second interface; the gas outlet is connected with the second cylinder; a first throttling element with an adjustable aperture is connected in series between the first interface and the outdoor heat exchanger; a second throttling element with an adjustable aperture is connected in series between the second interface and the indoor heat exchanger; the refrigerant radiator is connected in series between the gas outlet and the gas suction port of the second cylinder. By adopting the cooling-heating air conditioner, the energy efficiency of the air conditioner is increased efficiently.

Description

Heating and air conditioner and control method thereof

Technical field

The present invention relates to refrigerating field, especially relate to a kind of heating and air conditioner and control method thereof.

Background technology

Gaseous refrigerant after throttling and before entering vaporizer is not optimized cyclic design by current air-conditioning refrigeration system, causes that gaseous refrigerant affects evaporator heat exchange performance, and increases compressor compresses power consumption, thus having influence on energy efficiency of air conditioner level.Air injection enthalpy-increasing and Two-stage Compression technology can improve air conditioning system heating capacity level under low temperature and ultralow temperature, but for the commonly used cooling condition of air-conditioning, efficiency promotes very limited.

Summary of the invention

It is contemplated that one of technical problem solved at least to a certain extent in correlation technique.

For this, the present invention proposes a kind of heating and air conditioner, it is possible to is effectively improved energy efficiency of air conditioner, effectively facilitates energy-saving and emission-reduction.

The present invention also proposes the control method of a kind of above-mentioned heating and air conditioner.

Heating and air conditioner according to embodiments of the present invention, including: duplex cylinder compressor, described duplex cylinder compressor includes housing, the first cylinder, the second cylinder and the first reservoir, described housing is provided with air vent, described first cylinder and described second cylinder are respectively provided in described housing, described first reservoir is located at outside described housing, the air entry of described first cylinder connects with described first reservoir, and the span of the delivery space ratio of described second cylinder and described first cylinder is 1%～10%；Commutation assembly, described commutation assembly includes the first valve port to the 4th valve port, one of them connection in described first valve port and the second valve port and the 3rd valve port, described 4th valve port connects with another in described second valve port and described 3rd valve port, described first valve port is connected with described air vent, and described 4th valve port is connected with described first reservoir；Outdoor heat exchanger and indoor heat exchanger, the first end of described outdoor heat exchanger is connected with described second valve port, and the first end of described indoor heat exchanger is connected with described 3rd valve port；Gas-liquid separator, described gas-liquid separator includes gas outlet, first interface and the second interface, described gas outlet is connected with the air entry of described second cylinder, described first interface is connected with the second end of described outdoor heat exchanger, described second interface is connected with the second end of described indoor heat exchanger, it is in series with the adjustable first throttle element of aperture between described first interface and described outdoor heat exchanger, between described second interface and described indoor heat exchanger, is in series with the adjustable second section fluid element of aperture；For the coolant radiator that electric control element is dispelled the heat, described coolant radiator tandem is between the air entry of described gas outlet and described second cylinder.

Heating and air conditioner according to embodiments of the present invention, by arranging above-mentioned duplex cylinder compressor, energy efficiency of air conditioner can be effectively improved, effectively facilitate energy-saving and emission-reduction, simultaneously by arranging gas-liquid separator, it is possible to improve heat exchange efficiency, reduce compressor compresses power consumption, improve air-conditioner ability and efficiency further, further through arranging coolant radiator, it is possible to electric control element is carried out effective temperature-reducing.

In some embodiments of the invention, described first throttle element is electric expansion valve, and described second section fluid element is electric expansion valve.

In some embodiments of the invention, the span of gas-liquid separator volume is 100mL-500mL.

In some embodiments of the invention, heating and air conditioner also includes the first control valve and second and controls valve, described first controls valve is connected with described coolant radiator tandem, and described first be connected in series controls valve and described coolant radiator and be connected in parallel with described second control valve.

In some embodiments of the invention, described duplex cylinder compressor also includes the second reservoir being located at outside described housing, and described second reservoir is connected between the air entry of described gas outlet and described second cylinder.

Preferably, the volume of described first reservoir is more than the volume of the second reservoir.

nullThe control method of heating and air conditioner according to embodiments of the present invention，Heating and air conditioner is heating and air conditioner according to the above embodiment of the present invention，When heating and air conditioner is run，The restricting element being positioned at upstream in described first throttle element and described second section fluid element is one-level restricting element，The restricting element being positioned at downstream in described first throttle element and described second section fluid element is two-step throttle element，Described control method comprises the steps: first to adjust the aperture of described one-level restricting element to setting aperture according to the testing result detecting object to first，Then the aperture of described two-step throttle element is adjusted to setting aperture according to the testing result detecting object to second，The setting aperture of described one-level restricting element is less than the setting aperture of described two-step throttle element，The testing result that the testing result of described first detection object detects object from described second is different；Wherein said first detection object includes at least one outdoor environment temperature, the running frequency of duplex cylinder compressor, the delivery temperature of air vent, the pressure at expulsion of air vent, the intermediate pressure of coolant discharged from described gas outlet, the medium temperature of coolant discharged from described gas outlet；Described second detection object includes at least one outdoor environment temperature, the running frequency of duplex cylinder compressor, the delivery temperature of air vent, the pressure at expulsion of air vent, the intermediate pressure of coolant discharged from described gas outlet, the medium temperature of coolant discharged from described gas outlet.

The control method of heating and air conditioner according to embodiments of the present invention, then regulates the aperture of two-step throttle element again, so that the efficiency of system reaches optimum by first regulating the aperture of one-level restricting element.

In some embodiments of the invention, described first detection object and described second detection object are outdoor environment temperature T4 and running frequency F, the setting aperture obtaining one-level restricting element and two-step throttle element is calculated, then according to the aperture setting one-level restricting element corresponding to aperture adjustment and two-step throttle element according to the described outdoor environment temperature T4 detected and running frequency F.

In some embodiments of the invention, described first detection object is outdoor environment temperature T4 and running frequency F, first the setting aperture obtaining one-level restricting element is calculated according to described outdoor environment temperature T4 and described running frequency F, then according to the aperture setting the aperture described one-level restricting element of adjustment；Described second detection object is outdoor environment temperature T4, running frequency F and pressure at expulsion；Or described second detection object is outdoor environment temperature T4, running frequency F and delivery temperature, first calculate according to described outdoor environment temperature T4 and described running frequency F and obtain setting pressure at expulsion or setting delivery temperature, then according to actually detected to pressure at expulsion or delivery temperature adjusts the aperture of two-step throttle element so that the pressure at expulsion or the delivery temperature that detect reach set pressure at expulsion or set delivery temperature.

In some embodiments of the invention, preset multiple outdoor temperatures interval, the aperture of the restricting element that each described outdoor temperature interval is corresponding different, first detection object is outdoor environment temperature T4, adjusts the aperture of one-level restricting element according to the opening value that the outdoor temperature interval at the actually detected outdoor environment temperature T4 place arrived is corresponding；Described second detection object is outdoor environment temperature T4, running frequency F and pressure at expulsion；Or described second detection object is outdoor environment temperature T4, running frequency F and delivery temperature, first calculate according to described outdoor environment temperature T4 and described running frequency F and obtain setting pressure at expulsion or setting delivery temperature, then according to actually detected to pressure at expulsion or delivery temperature adjusts the aperture of two-step throttle element so that the pressure at expulsion or the delivery temperature that detect reach set pressure at expulsion or set delivery temperature.

In some embodiments of the invention, preset medium temperature or default intermediate pressure, described first detection object is intermediate pressure or medium temperature, according to actually detected to intermediate pressure or medium temperature adjusts the aperture of one-level restricting element so that the intermediate pressure that detects or medium temperature reach to preset intermediate pressure or default medium temperature；Described second detection object is outdoor environment temperature T4, running frequency F and pressure at expulsion；Or described second detection object is outdoor environment temperature T4, running frequency F and delivery temperature, first calculate according to described outdoor environment temperature T4 and described running frequency F and obtain setting pressure at expulsion or setting delivery temperature, then according to actually detected to pressure at expulsion or delivery temperature adjusts the aperture of two-step throttle element so that the pressure at expulsion or the delivery temperature that detect reach set pressure at expulsion or set delivery temperature.

In some embodiments of the invention, preset medium temperature or default intermediate pressure, described first detection object is intermediate pressure or medium temperature, according to actually detected to intermediate pressure or medium temperature adjusts the aperture of one-level restricting element so that the intermediate pressure that detects or medium temperature reach to preset intermediate pressure or default medium temperature；Described second detection object is outdoor environment temperature T4 and running frequency F, first calculates the setting aperture obtaining two-step throttle element according to described outdoor environment temperature T4 and described running frequency F, then according to the aperture setting the aperture described two-step throttle element of adjustment.

In some embodiments of the invention, preset multiple outdoor temperatures interval, the aperture of the restricting element that each described outdoor temperature interval is corresponding different, first detection object is outdoor environment temperature T4, adjusts the aperture of one-level restricting element according to the opening value that the outdoor temperature interval at the actually detected outdoor environment temperature T4 place arrived is corresponding；Described second detection object is outdoor environment temperature T4 and running frequency F, first calculates the setting aperture obtaining two-step throttle element according to described outdoor environment temperature T4 and described running frequency F, then according to the aperture setting the aperture described two-step throttle element of adjustment.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of the heating and air conditioner according to first embodiment of the invention；

Fig. 2 is the schematic diagram of the heating and air conditioner according to second embodiment of the invention；

Fig. 3 is the schematic diagram of the heating and air conditioner according to third embodiment of the invention；

Fig. 4 is the schematic diagram of the heating and air conditioner according to four embodiment of the invention；

Fig. 5 is the schematic diagram of duplex cylinder compressor according to embodiments of the present invention；

Fig. 6 is the flow chart of control method during heating and air conditioner refrigeration according to embodiments of the present invention；

Fig. 7 is the flow chart of control method when heating of the heating and air conditioner according to embodiments of the present invention.

Accompanying drawing labelling:

Heating and air conditioner 100,

Duplex cylinder compressor 1, housing the 10, first cylinder the 11, second cylinder the 12, first reservoir the 13, second reservoir 14, air vent 15,

Commutation assembly the 2, first valve port D, the second valve port C, the 3rd valve port E, the 4th valve port S,

Outdoor heat exchanger 3, indoor heat exchanger 4,

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

First throttle element 6, second section fluid element 7,

First control valve 8, coolant radiator 9,

Second controls valve 20.

Detailed description of the invention

Being described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings.The embodiment described below with reference to accompanying drawing is illustrative of, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.

In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axially ", " radially ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than the device of instruction or hint indication or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not considered as limiting the invention.

Additionally, term " first ", " second " are only for descriptive purposes, and it is not intended that indicate or imply relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or implicitly include at least one this feature.In describing the invention, " multiple " are meant that at least two, for instance two, three etc., unless otherwise expressly limited specifically.

In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, for instance, it is possible to it is fixing connection, it is also possible to be removably connect, or integral；Can be mechanically connected, it is also possible to be electrical connection or each other can communication；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, it is possible to be connection or the interaction relationship of two elements of two element internals, unless otherwise clear and definite restriction.For the ordinary skill in the art, it is possible to understand above-mentioned term concrete meaning in the present invention as the case may be.

Heating and air conditioner 100 according to embodiments of the present invention being described in detail below with reference to Fig. 1-Fig. 5, wherein heating and air conditioner 100 has refrigeration mode and heating mode.

As Figure 1-Figure 5, heating and air conditioner 100 according to embodiments of the present invention, including: duplex cylinder compressor 1, commutation assembly 2, outdoor heat exchanger 3 and indoor heat exchanger 4, gas-liquid separator 5, first throttle element 6, second section fluid element 7 and coolant radiator 9.Wherein duplex cylinder compressor 1 includes housing the 10, first cylinder the 11, second cylinder 12 and the first reservoir 13, housing 10 is provided with air vent 15, first cylinder 11 and the second cylinder 12 are respectively provided in housing 10, first reservoir 13 is located at outside housing 10, and air entry and first reservoir 13 of the first cylinder 11 connect.It is to say, the first cylinder 11 and the second cylinder 12 carry out independent compression process, coolant after the compression that the first cylinder 11 is discharged and the coolant after the compression discharged from the second cylinder 12 are drained into respectively in housing 10 and then discharge from air vent 15.

The span of the delivery space ratio of the second cylinder 12 and the first cylinder 11 is 1%～10%.Further, the span of the delivery space ratio of the second cylinder 12 and the first cylinder 11 is 1%～9%, it is preferable that the span of the delivery space ratio of the second cylinder 12 and the first cylinder 11 is 4%～9%.The such as delivery space ratio of the second cylinder 12 and the first cylinder 11 can be the parameter such as 4%, 5%, 8% or 8.5%.

Commutation assembly 2 includes the first valve port D to the 4th valve port S, one of them connection in first valve port D and the second valve port C and the 3rd valve port E, another connection in 4th valve port S and the second valve port C and described 3rd valve port E, first valve port D is connected with air vent 15, and the 4th valve port S and the first reservoir 13 are connected.First end of outdoor heat exchanger 3 and the second valve port C are connected, and the first end of indoor heat exchanger 4 and the 3rd valve port E are connected.Specifically, when heating and air conditioner 100 is freezed, the first valve port D and the second valve port C connection and the 3rd valve port E and the four valve port S connect, and when heating and air conditioner 100 heats, the first valve port D and the three valve port E connection and the second valve port C and the four valve port S connect.Preferably, commutation assembly 2 is cross valve.

Gas-liquid separator 5 includes gas outlet m, first interface f and the second interface g, the air entry of gas outlet m and the second cylinder 12 is connected, first interface f is connected with the second end of outdoor heat exchanger 3, second interface g is connected with the second end of indoor heat exchanger 4, it is in series with the adjustable first throttle element 6 of aperture between first interface f and outdoor heat exchanger 3, between the second interface g and indoor heat exchanger 4, is in series with the adjustable second section fluid element 7 of aperture.Alternatively, first throttle element 6 is electric expansion valve, and second section fluid element 7 is electric expansion valve, it is of course possible to be understood by, and first throttle element 6 and second section fluid element 7 all can also is that other apertures adjustable element such as heating power expansion valve.

Coolant radiator 9 is for dispelling the heat to electric control element, and coolant radiator 9 is connected between the air entry of gas outlet m and the second cylinder 12.As long as it is understood that the structure of coolant radiator 9 can be varied coolant that can circulate, for instance coolant radiator 9 can include the metal tube extended that wriggles.

When heating and air conditioner 100 is freezed, the High Temperature High Pressure coolant discharged from the air vent 15 of duplex cylinder compressor 1 is drained into outdoor heat exchanger 3 by the first valve port D and the second valve port C and carries out condensation heat radiation, the liquid refrigerants that heat exchanger 3 is discharged outdoor is drained into gas-liquid separator 5 from first interface f after the one-level reducing pressure by regulating flow of first throttle element 6 and carries out gas-liquid separation, the intermediate pressure gaseous coolant separated enters in coolant radiator 9 from gas outlet m to carry out heat exchange with electric control element, thus realizing the purpose that electric control element is dispelled the heat, it is drained in the second cylinder 12 from the coolant of coolant radiator 9 discharge and is compressed.

It is drained into after the two-step throttle blood pressure lowering of second section fluid element 7 in indoor heat exchanger 4 from the second interface g of gas-liquid separator 5 intermediate pressure liquid coolant discharged and carries out heat exchange to reduce indoor environment temperature, the coolant that heat exchanger 4 is discharged indoor is drained in the first reservoir 13 by the 3rd valve port E and the four valve port S, is drained in the first cylinder 11 from the coolant of the first reservoir 13 discharge and is compressed.

When heating and air conditioner 100 heats, the High Temperature High Pressure coolant discharged from the air vent 15 of duplex cylinder compressor 1 is drained into indoor heat exchanger 4 by the first valve port D and the three valve port E and carries out condensation heat radiation to raise indoor environment temperature, the high-pressure liquid coolant that heat exchanger 4 is discharged indoor is drained into gas-liquid separator 5 from the second interface g after the one-level reducing pressure by regulating flow of second section fluid element 7 and carries out gas-liquid separation, the intermediate pressure gaseous coolant separated enters in coolant radiator 9 from gas outlet m to carry out heat exchange with electric control element, thus realizing the purpose that electric control element is dispelled the heat, it is drained in the second cylinder 12 from the coolant of coolant radiator 9 discharge and is compressed.

It is drained into after the two-step throttle blood pressure lowering of first throttle element 6 in outdoor heat exchanger 3 from the first interface f of the gas-liquid separator 5 intermediate pressure liquid coolant discharged and carries out heat exchange, the coolant that heat exchanger 3 is discharged outdoor is drained in the first reservoir 13 by the second valve port C and the four valve port S, is drained in the first cylinder 11 from the coolant of the first reservoir 13 discharge and is compressed.

Thus analyze known, when heating and air conditioner 100 is run, the coolant of different pressures state has respectively entered in the first cylinder 11 and the second cylinder 12, first cylinder 11 and the second cylinder 12 complete independently compression process, coolant after the compression that the first cylinder 11 is discharged and the coolant after the compression discharged from the second cylinder 12 are discharged in housing 10 and discharge from air vent 15 after mixing, simultaneously because the span of the delivery space ratio of the second cylinder 12 and the first cylinder 11 is 1%～10%, the coolant that flow is less and pressure state is higher is drained in the second cylinder 12 that delivery space is less and is compressed, such that it is able to raising efficiency, energy-saving and emission-reduction.

Simultaneously by being provided with gas-liquid separator 5 between outdoor heat exchanger 3 and indoor heat exchanger 4, it is compressed thus gas-liquid separator 5 is expelled back into after being separated by a part of gaseous coolant in the second cylinder 12, gas content in being flowed into the gas content in the coolant of indoor heat exchanger 4 when thus reducing refrigeration and reducing the coolant being flowed into outdoor heat exchanger 3 when heating, decrease the gaseous coolant impact on the heat exchange property as the indoor heat exchanger 4 of vaporizer or outdoor heat exchanger 3, such that it is able to raising heat exchange efficiency, reduce compressor compresses power consumption.

Heating and air conditioner 100 according to embodiments of the present invention, by arranging above-mentioned duplex cylinder compressor 1, energy efficiency of air conditioner can be effectively improved, effectively facilitate energy-saving and emission-reduction, simultaneously by arranging gas-liquid separator 5, it is possible to improve heat exchange efficiency, reduce compressor compresses power consumption, improve air-conditioner ability and efficiency further, again owing to arranging coolant radiator 9, it is possible to electric control element is carried out effective temperature-reducing.

In some embodiments of the invention, the span of the volume of gas-liquid separator 5 is 100mL-500mL.

In some embodiments of the invention, as shown in Figure 3 and Figure 4, duplex cylinder compressor 1 also includes the second reservoir 14 being located at outside housing 10, and the second reservoir 14 is connected between the air entry of gas outlet m and the second cylinder 12.Thereby through being provided with the second reservoir 14, further gas-liquid separation can be carried out to from the gas outlet m of gas-liquid separator 5 coolant discharged, liquid coolant can be avoided further to return in the second cylinder 12, thus avoiding duplex cylinder compressor 1 that liquid hit phenomenon occurs, improve the service life of duplex cylinder compressor 1.

In further embodiment of the present invention, the volume of the first reservoir 13 is more than the volume of the second reservoir 14.Thus under ensureing the premise of decrement of the second cylinder 12, less by the volume making the second reservoir 14, it is possible to reduce cost.Preferably, the volume of the second reservoir 14 is not more than 1/2nd of the first reservoir 13 volume.

As shown in Figure 2 and Figure 4, in some embodiments of the invention, heating and air conditioner 100 also includes the first control valve 8 and second and controls valve 20, and first controls valve 8 is connected in series with coolant radiator 9, and first be connected in series controls valve 8 and coolant radiator 9 and the second control valve 20 is connected in parallel.Specifically, first control valve 8 and second control valve 9 can respectively electromagnetic valve.

When needs utilize coolant radiator 9 that electric control element is dispelled the heat, open the first control valve 8 and close the second control valve 20, from the gas outlet m of gas-liquid separator 5 gaseous coolant discharged by the first control valve 8 be drained in coolant radiator 9 with electric control element heat exchange.When utilizing coolant radiator 9 that electric control element is dispelled the heat, close the first control valve 8 and open the second control valve 20, it is directly discharged in the second cylinder 12 from the gas outlet m of gas-liquid separator 5 gaseous coolant discharged is compressed by the second control valve 20, such that it is able to choose whether as required to adopt coolant radiator 9 that electric control element is dispelled the heat, improve the automaticity of heating and air conditioner 100.

When liquid coolant in gas-liquid separator 5 is beyond safety levels simultaneously, liquid refrigerants can be avoided to enter in the second cylinder 12 by closing the first control valve 8 and the second control valve 20, such that it is able to avoid duplex cylinder compressor 1 that liquid hammer occurs, extend the service life of duplex cylinder compressor 1.It is possible to further arranging liquid level sensor on gas-liquid separator 5, control the first control valve 8 by the testing result of liquid level sensor and the second control valve 20 cuts out.

Heating and air conditioner according to the above embodiment of the present invention (is set specified refrigerating capacity as 3.5kw by inventor, it being 7.6% by the delivery space ratio set of the second cylinder and the first cylinder) efficiency under different operating modes compares with existing heating and air conditioner efficiency at the same conditions, obtains following data:

Measurement condition	Prior art efficiency	Technical solution of the present invention efficiency	Lifting ratio
				Specified refrigeration	3.93	4.26	8.40%
Middle refrigeration	5.88	6.18	5.10%
				Specified heat	3.64	3.91	7.42%
Centre heats	5.55	5.89	6.13%
				Low-temperature heating	2.57	2.73	6.23%
APF	4.61	4.92	6.72%

It follows that heating and air conditioner according to embodiments of the present invention is all obviously improved relative to existing cold-warm type compressor, each operating mode efficiency and annual efficiency APF.

The heating and air conditioner of different specified refrigerating capacitys with the embodiment of the present invention of different delivery space ratios is compared by inventor with the heating and air conditioner under existing identical operating mode simultaneously, find that efficiency all has lifting, through overtesting, such as inventor finds that the heating and air conditioner of the embodiment of the present invention (sets specified refrigerating capacity as 2.6kw, it is 9.2% by the delivery space ratio set of the second cylinder and the first cylinder) compared with the heating and air conditioner under existing identical operating mode, efficiency improves 7.3%.

Below with reference to the control method of Fig. 1-Fig. 7 detailed description heating and air conditioner according to embodiments of the present invention, wherein heating and air conditioner is heating and air conditioner according to the above embodiment of the present invention.When heating and air conditioner is run, the restricting element being positioned at upstream in first throttle element and second section fluid element is one-level restricting element, the restricting element being positioned at downstream in first throttle element and second section fluid element is two-step throttle element, in other words, when refrigeration, first throttle element is one-level restricting element, and second section fluid element is two-step throttle element.When heating, second section fluid element is one-level restricting element, and first throttle element is two-step throttle element.

Control method according to embodiments of the present invention comprises the steps: first to adjust the aperture of one-level restricting element according to the testing result detecting object to first, then the aperture of two-step throttle element is adjusted according to the testing result detecting object to second, the setting aperture of one-level restricting element is less than the setting aperture of two-step throttle element, and the testing result that the testing result of the first detection object detects object from second is different.Need illustrate be, the testing result of the first detection object is different with the testing result of the second detection object refers to one-level restricting element and two-step throttle element can not adopt same state parameter to be adjusted control simultaneously, in other words, different with the required relevant parameter for regulating two-step throttle element for regulating the required relevant parameter of one-level restricting element.

Wherein the first detection object includes at least one medium temperature of outdoor environment temperature, the running frequency of duplex cylinder compressor, the delivery temperature of air vent, the pressure at expulsion of air vent, the intermediate pressure from the coolant of gas outlet's discharge, the coolant from gas outlet's discharge.Second detection object includes at least one medium temperature of outdoor environment temperature, the running frequency of duplex cylinder compressor, the delivery temperature of air vent, the pressure at expulsion of air vent, the intermediate pressure from the coolant of gas outlet's discharge, the coolant from gas outlet's discharge.

That is, as shown in Figure 6 and Figure 7, no matter freeze or heat, when heating and air conditioner is run, equal acquisition process controls the parameter needed for one-level restricting element and two-step throttle element, then the parameter that basis obtains is all first regulate the aperture of one-level restricting element until setting aperture, then the aperture of two-step throttle element is regulated again until setting aperture, when one-level restricting element and two-step throttle element all regulate to when setting aperture, the aperture of one-level restricting element is less than the aperture of two-step throttle element.Of course, it should be understood that the step of the parameter needed for acquisition process control one-level restricting element and the parameter needed for acquisition process control two-step throttle element can carry out successively carrying out simultaneously.

After the aperture of one-level restricting element and the aperture of two-step throttle element are satisfied by condition, can after running the n second, again detection the first detection object and the second detection object, then adjust the aperture of one-level restricting element and two-step throttle element, so repeat according to testing result.Certain repeat condition is not limited to this, for instance can after receiving the operational order of user, and detection the first detection object and the second detection object, then adjust the aperture of one-level restricting element and two-step throttle element according to testing result again.In other words, when freezing or heating, after the aperture of one-level restricting element and two-step throttle element is satisfied by condition, the n second can run or after receiving the operation signal of user, the relevant parameter of first throttle element and the aperture of second section fluid element is detected judgement again, then adjust the aperture of first throttle element and second section fluid element according to result of determination, so repeat.

Control method according to the several specific embodiment of the present invention is described below.

Embodiment 1:

In this embodiment, first detection object and the second detection object are outdoor environment temperature T4 and running frequency F, the setting aperture obtaining one-level restricting element and two-step throttle element is calculated, then according to the aperture setting one-level restricting element corresponding to aperture adjustment and two-step throttle element according to the outdoor environment temperature T4 detected and running frequency F.

It is understood that computing formula is located in the electric control element of heating and air conditioner in advance, computing formula specifically can limit according to practical situation.

Specifically, during refrigeration, the relational expression between aperture LA_cool_1 and outdoor environment temperature T4 and the running frequency F of first throttle element is: LA_cool_1=a₁·F+b₁T₄+c₁, when the aperture LA_cool_1 calculated is more than the actual aperture of the first throttle element gathered, the aperture of first throttle element is increased to calculating aperture；Otherwise turn down.

Relational expression between aperture LA_cool_2 and outdoor environment temperature T4 and the running frequency F of second section fluid element is: LA_cool_2=a₂·F+b₂T₄+c₂, when the aperture LA_cool_2 calculated is more than the actual aperture of the second section fluid element gathered, the aperture of second section fluid element is increased to calculating aperture；Otherwise turn down.Wherein, 0≤a₁≤ 20,0≤b₁≤ 20 ,-50≤c₁≤100；0≤a₂≤ 30,0≤b₂≤ 30 ,-50≤c₂≤ 150 control coefrficient a, b, c can be all 0, when any of coefficient is zero, it was demonstrated that parameter corresponding to this coefficient on restricting element aperture without impact.

When heating, the relational expression between aperture LA_heat_1 and outdoor environment temperature T4 and the running frequency F of second section fluid element is: LA_heat_1=x₁·F+y₁T₄+z₁, when the aperture LA_heat_1 calculated is more than the actual aperture of the second section fluid element gathered, the aperture of second section fluid element is increased to calculating aperture；Otherwise turn down.

Relational expression between aperture LA_heat_2 and outdoor environment temperature T4 and the running frequency F of first throttle element is: LA_heat_2=x₂·F+y₂T₄+z₂, when the aperture LA_heat_2 calculated is more than the actual aperture of the first throttle element gathered, the aperture of first throttle element is increased to calculating aperture；Otherwise turn down.Wherein, 0≤x₁≤ 15,0≤y₁≤ 15 ,-50≤z₁≤100；0≤x₂≤ 25,0≤y₂≤ 25 ,-50≤z₂≤ 150 control coefrficient x, y, z can be all 0, when any of coefficient is zero, it was demonstrated that parameter corresponding to this coefficient on restricting element aperture without impact.

Such as when refrigeration, detecting that outdoor environment temperature is 35 DEG C, compressor operating frequency is 58Hz, sets a₁=1, b₁=1.6, c₁=6；a₂=1.5, b₂=1.6, c₂=17.First system is according to the frequency collected and T4 value, and the aperture calculating first throttle element should be 120, adjusts the aperture of first throttle element to 120；Then the aperture calculating second section fluid element is 160, adjusts the aperture of second section fluid element to 160.After maintaining the aperture 200s of two restricting elements, detection compressor operating frequency and T4 value again；Or according to user's adjustment to air-conditioning, detection compressor operating frequency and T4 value, first throttle element and second section fluid element are readjusted.

According to this adjustment mode, air conditioner Energy Efficiency Ratio equivalent specifications air-conditioner in the market, efficiency is high by 6.5%.

When heating, detecting that outdoor environment temperature is 7 DEG C, compressor operating frequency is 72Hz, sets x₁=2.0, y₁=3.0, z₁=22.0；x₂=1, y₂=3.0, z₂=7.0.First system is according to the frequency collected and T4 value, and the aperture calculating second section fluid element should be 187, adjusts the aperture of second section fluid element to 187；Then the aperture calculating first throttle element is 100, adjusts the aperture of first throttle element to 100.After maintaining the aperture 200s of two restricting elements, detection compressor operating frequency and T4 value again, or according to user's adjustment to air-conditioning, detect compressor operating frequency and T4 value, first throttle element and second section fluid element are readjusted.

Embodiment 2:

In this embodiment, the first detection object is outdoor environment temperature T4 and running frequency F, first calculates the setting aperture obtaining one-level restricting element according to outdoor environment temperature T4 and running frequency F, then according to the aperture setting aperture adjustment one-level restricting element；

Second detection object is outdoor environment temperature T4, running frequency F and pressure at expulsion；Or the second detection object is outdoor environment temperature T4, running frequency F and delivery temperature, first calculate according to outdoor environment temperature T4 and running frequency F and obtain setting pressure at expulsion or setting delivery temperature, then according to actually detected to pressure at expulsion or delivery temperature adjusts the aperture of two-step throttle element so that the pressure at expulsion or the delivery temperature that detect reach set pressure at expulsion or set delivery temperature.

When the second detection object includes delivery temperature, the relational expression between delivery temperature TP and outdoor environment temperature T4 and running frequency F is: TP_cool=a₂·F+b₂T₄+c₂, when the second detection object includes pressure at expulsion, the relational expression between pressure at expulsion P row and outdoor environment temperature T4 and running frequency F is: P row _ cool=a₃·F+b₃T₄+c₃, when the delivery temperature collected or pressure at expulsion are more than the setting delivery temperature calculated or setting pressure at expulsion, open the aperture of big second section fluid element；Otherwise turn down.Wherein 0≤a₁≤ 20,0≤b₁≤ 20 ,-50≤c₁≤ 100,0≤a₂≤ 30,0≤b₂≤ 30 ,-50≤c₂≤ 150,0≤a₃≤ 30,0≤b₃≤ 30 ,-50≤c₃≤150.Control coefrficient a, b, c can be all 0, when any of coefficient is zero, it was demonstrated that parameter corresponding to this coefficient on restricting element aperture without impact.

When heating, the relational expression between aperture LA_heat_1 and outdoor environment temperature T4 and the running frequency F of second section fluid element is: LA_heat_1=x₁·F+y₁T₄+z₁, when the aperture LA_heat_1 calculated is more than the actual aperture of the second section fluid element gathered, the aperture of second section fluid element is increased and calculates aperture；Otherwise turn down.

When the second detection object includes delivery temperature, the relational expression between delivery temperature TP and outdoor environment temperature T4 and running frequency F is: TP_heat=x₂·F+y₂T₄+z₂, when the second detection object includes pressure at expulsion, the relational expression between pressure at expulsion P row and outdoor environment temperature T4 and running frequency F is: P row _ heat=x₃·F+y₃T₄+z₃, when the delivery temperature collected or pressure at expulsion are more than the setting delivery temperature calculated or setting pressure at expulsion, open the aperture of big first throttle element；Otherwise turn down.Wherein 0≤x₁≤ 15,0≤y₁≤ 15 ,-50≤z₁≤ 100,0≤x₂≤ 25,0≤y₂≤ 25 ,-50≤z₂≤ 150,0≤x₃≤ 25,0≤y₃≤ 25 ,-50≤z₃≤150.Control coefrficient x, y, z can be all 0, when any of coefficient is zero, it was demonstrated that parameter corresponding to this coefficient on restricting element aperture without impact.

Such as when refrigeration, detecting that outdoor environment temperature is 35 DEG C, compressor operating frequency is 58Hz, sets a₁=1, b₁=1.6, c₁=6；a₂=0.5, b₂=0.4, c₂=31；a₃=0.25, b₃=0.2, c₂=3.9.First system is according to the frequency collected and T4 value, the aperture calculating first throttle element should be 120, adjust the aperture of first throttle element to 120, then system is according to the frequency used and T4 value, calculate delivery temperature TP_cool corresponding to second section fluid element and be 74 DEG C or pressure at expulsion P row _ cool is 2.54MPa, at this moment the aperture of whole second section fluid element is teased and ridicule according to the delivery temperature TP detected or pressure at expulsion P, when the delivery temperature detected is more than 74 DEG C (or the pressure at expulsion P detected arranges more than 2.54Mpa), progressively strengthen the aperture (can by regulating 4 step actions every time) of second section fluid element.After maintaining the aperture 200s of two restricting elements, detection compressor operating frequency and T4 value again, or according to user's adjustment to air-conditioning, detect compressor operating frequency and T4 value, first throttle element and second section fluid element are readjusted.

When heating, detecting when outdoor environment temperature is 7 DEG C, compressor operating frequency is 72Hz, sets x₁=2.0, y₁=3.0, z₁=22.0；x₂=0.5, y₂=0.4, z₂=30；x₃=0.25, y₃=0.2, z₃=5.First system is according to the frequency collected and T4 value, the aperture calculating second section fluid element should be 187, adjust the aperture of second section fluid element to 187, then system is according to the frequency used and T4 value, calculating delivery temperature TP_heat corresponding to first throttle element is 68.8 DEG C, and pressure at expulsion P row _ heat is 2.44MPa.At this moment the aperture of first throttle element is adjusted according to the delivery temperature TP detected or pressure at expulsion P, when the delivery temperature detected is more than 68.8 DEG C (or the pressure at expulsion P detected arranges more than 2.44Mpa), progressively strengthen the aperture (can by regulating 4 step actions every time) of first throttle element, otherwise be gradually reduced the aperture of first throttle element.After maintaining the aperture 200s of two restricting elements, detection compressor operating frequency and T4 value again, or according to user's adjustment to air-conditioning, detect compressor operating frequency and T4 value, first throttle element and second section fluid element are readjusted.

Embodiment 3:

In this embodiment, preset multiple outdoor temperatures interval, the aperture of the restricting element that each outdoor temperature interval is corresponding different, first detection object is outdoor environment temperature T4, adjusts the aperture of one-level restricting element according to the opening value that the outdoor temperature interval at the actually detected outdoor environment temperature T4 place arrived is corresponding；

Second detection object is outdoor environment temperature T4, running frequency F and pressure at expulsion；Or the second detection object is outdoor environment temperature T4, running frequency F and delivery temperature, first calculating according to outdoor environment temperature T4 and running frequency F and obtain setting pressure at expulsion or setting delivery temperature, then adjusting the aperture of two-step throttle element to pressure at expulsion or delivery temperature so that detecting that pressure at expulsion or delivery temperature reach set pressure at expulsion or set delivery temperature according to actually detected.

Specifically, during refrigeration, the concrete condition such as following table of the aperture of the first throttle element that different outdoor temperature intervals is corresponding:

T4	Aperture
		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 delivery temperature, the relational expression between delivery temperature TP and outdoor environment temperature T4 and running frequency F is: TP_cool=a₁·F+b₁T₄+c₁, when the second detection object includes pressure at expulsion, the relational expression between pressure at expulsion P row and outdoor environment temperature T4 and running frequency F is: P row _ cool=a₂·F+b₂T₄+c₂, when the delivery temperature collected or pressure at expulsion are more than the setting delivery temperature calculated or setting pressure at expulsion, open the aperture of big second section fluid element；Otherwise turn down.Wherein 0≤a₁≤ 20,0≤b₁≤ 20 ,-50≤c₁≤ 100,0≤a₂≤ 30,0≤b₂≤ 30 ,-50≤c₂≤150.Control coefrficient a, b, c can be all 0, when any of coefficient is zero, it was demonstrated that parameter corresponding to this coefficient on restricting element aperture without impact.

When heating, the concrete condition such as following table of the aperture of the second section fluid element that different outdoor temperature intervals is corresponding:

When the second detection object includes delivery temperature, the relational expression between delivery temperature TP and outdoor environment temperature T4 and running frequency F is: TP_heat=x₁·F+y₁T₄+z₁, when the second detection object includes pressure at expulsion, the relational expression between pressure at expulsion P row and outdoor environment temperature T4 and running frequency F is: P row _ heat=x₂·F+y₂T₄+z₂, when the delivery temperature collected or pressure at expulsion are more than the setting delivery temperature calculated or setting pressure at expulsion, open the aperture of big first throttle element；Otherwise turn down.Wherein 0≤x₁≤ 25,0≤y₁≤ 25 ,-50≤z₁≤ 150,0≤x₂≤ 25,0≤y₂≤ 25 ,-50≤z₂≤150.Control coefrficient x, y, z can be all 0, when any of coefficient is zero, it was demonstrated that parameter corresponding to this coefficient on restricting element aperture without impact.

Such as, detecting outdoor environment temperature during refrigeration is 35 DEG C, and compressor operating frequency is 58Hz, sets a₁=0.5, b₁=0.4, c₁=31；a₂=0.25, b₂=0.2, c₂=3.9.First system is according to collecting outdoor environment temperature T4, show that the aperture of first throttle element should be 120, adjusts the aperture of first throttle element to 120；Then system is according to frequency and T4 value, calculate delivery temperature TP_cool corresponding to second section fluid element and be 74 DEG C or pressure at expulsion P row _ cool is 2.54MPa, at this moment the aperture of second section fluid element is adjusted according to the delivery temperature TP detected or pressure at expulsion P, such as when the delivery temperature detected is more than 74 DEG C (or the pressure at expulsion P detected arranges more than 2.54Mpa), progressively strengthen the aperture (can by regulating 4 step actions every time) of second section fluid element.After maintaining the aperture 200s of two restricting elements, detection compressor operating frequency and T4 value again, or according to user's adjustment to air-conditioning, detect compressor operating frequency and T4 value, first throttle element and second section fluid element are readjusted.

When heating, detecting that outdoor environment temperature is 7 DEG C, compressor operating frequency is 72Hz, sets x₁=0.5, y₁=0.4, z₁=30；x₂=0.25, y₂=2, z₂=5.First system is according to the outdoor environment temperature T4 collected, and show that the aperture of second section fluid element should be 180, adjusts the aperture of second section fluid element to 180；Then system is according to the frequency used and T4 value, and calculating delivery temperature TP_heat corresponding to first throttle element is 68.8 DEG C, and pressure at expulsion P row _ heat is 3.7MPa.At this moment the aperture of first throttle element is adjusted according to the delivery temperature TP detected or pressure at expulsion P, when the delivery temperature detected is more than 68.8 DEG C (or the pressure at expulsion P detected arranges more than 3.7Mpa), progressively strengthen the aperture (can by regulating 4 step actions every time) of first throttle element, otherwise be gradually reduced the aperture of first throttle element.After maintaining the aperture 200s of two restricting elements, detection compressor operating frequency and T4 value again, or according to user's adjustment to air-conditioning, detect compressor operating frequency and T4 value, first throttle element and second section fluid element are readjusted.

Embodiment 4:

In this embodiment, preset medium temperature or intermediate pressure, first detection object is intermediate pressure or medium temperature, according to actually detected to intermediate pressure or medium temperature adjusts the aperture of one-level restricting element so that the intermediate pressure that detects or medium temperature reach to preset intermediate pressure or default medium temperature.

Second detection object is outdoor environment temperature T4, running frequency F and pressure at expulsion；Or the second detection object is outdoor environment temperature T4, running frequency F and delivery temperature, first calculate according to outdoor environment temperature T4 and running frequency F and obtain setting pressure at expulsion or setting delivery temperature, then adjust the aperture of two-step throttle element to pressure at expulsion or delivery temperature so that the pressure at expulsion or the delivery temperature that detect reach set pressure at expulsion or set delivery temperature according to actually detected.

Specifically, during refrigeration, the interval of default medium temperature can be 20 DEG C-35 DEG C, and the interval of the intermediate pressure preset can be 0.8MPa-2.0MPa.When intermediate pressure or medium temperature being detected lower than setting value, open the aperture of big first throttle element, otherwise turn down.

When heating, the interval of default medium temperature can be 20 DEG C-30 DEG C, and the interval of the intermediate pressure preset can be 1.0MPa-2.5MPa.When intermediate pressure or medium temperature being detected higher than setting value, open the aperture of big second section fluid element, otherwise turn down.

Such as, when freezing, setting medium temperature as 26 DEG C or setting intermediate pressure 1.65MPa, detect that outdoor environment temperature is 35 DEG C, compressor operating frequency is 58Hz, sets a₁=0.5, b₁=0.4, c₁=31；a₂=0.25, b₂=0.2, c₂=3.9.First, system adjusts the aperture of first throttle element according to the medium temperature collected or intermediate pressure value.When the medium temperature collected more than 26 DEG C or the intermediate pressure collected more than 1.65MPa time, progressively turn down the aperture (can by regulate 4 step actions) of first throttle element every time.Otherwise the aperture of turning down.Then system is according to frequency and T4 value, calculate delivery temperature TP_cool corresponding to second section fluid element and be 74 DEG C or pressure at expulsion P row _ cool is 2.54MPa, at this moment the aperture of second section fluid element is adjusted according to the delivery temperature TP detected or pressure at expulsion P, when delivery temperature being detected more than 74 DEG C (or the pressure P row detected is more than 2.54Mpa), progressively strengthen the aperture (can by regulating 4 step actions every time) of second section fluid element.After maintaining the aperture 200s of two restricting elements, detection compressor operating frequency and T4 value again, or according to user's adjustment to air-conditioning, detect compressor operating frequency and T4 value, first throttle element and second section fluid element are readjusted.

When heating, set medium temperature as 26 DEG C, intermediate pressure 1.6MPa, detect that outdoor environment temperature is 7 DEG C, compressor operating frequency is 72Hz, sets x₁=0.5, y₁=0.4, z₁=30；x₂=0.25, y₂=2, z₂=5.First system adjusts the aperture of second section fluid element according to the medium temperature collected or intermediate pressure value.When the medium temperature collected more than 26 DEG C or the intermediate pressure collected more than 1.6MPa time, progressively strengthen the aperture (can by regulate 4 step actions) of second section fluid element every time.Otherwise the aperture of turning down.Then system is according to the frequency detected and T4 value, and calculating delivery temperature TP_heat corresponding to first throttle element is 68.8 DEG C, and pressure at expulsion P row _ heat is 3.7MPa.At this moment the aperture of first throttle element is adjusted according to the delivery temperature TP detected or pressure at expulsion P, when the delivery temperature detected is more than 68.8 DEG C (or the pressure at expulsion P detected arranges more than 3.7Mpa), progressively strengthen the aperture (can by regulating 4 step actions every time) of first throttle element, otherwise be gradually reduced the aperture of first throttle element.After maintaining the aperture 200s of two restricting elements, detection compressor operating frequency and T4 value again, or according to user's adjustment to air-conditioning, detect compressor operating frequency and T4 value, first throttle element and second section fluid element are readjusted.

Embodiment 5:

In this embodiment, preset medium temperature or intermediate pressure, first detection object is intermediate pressure or medium temperature, according to actually detected to intermediate pressure or medium temperature adjusts the aperture of one-level restricting element so that the intermediate pressure that detects or medium temperature reach to preset intermediate pressure or default medium temperature；

Second detection object is outdoor environment temperature T4 and running frequency F, first calculates the setting aperture obtaining two-step throttle element according to outdoor environment temperature T4 and running frequency F, then according to the aperture setting aperture adjustment two-step throttle element.

Specifically, the interval of the medium temperature preset during refrigeration can be 20 DEG C-35 DEG C, and the interval of the intermediate pressure preset can be 0.8MPa-1.5MPa.When intermediate pressure or temperature being detected lower than setting value, open the aperture of big first throttle element, otherwise turn down.

Relational expression between aperture LA_cool_2 and outdoor environment temperature T4 and the running frequency F of second section fluid element is: LA_cool_2=a₂·F+b₂T₄+c₂, when the aperture LA_cool_2 calculated is more than the actual aperture of the second section fluid element gathered, the aperture of second section fluid element is increased to calculating aperture；Otherwise turn down.Wherein, 0≤a₂≤ 30,0≤b₂≤ 30 ,-50≤c₂≤ 150, control coefrficient a, b, c can be all 0, when any of coefficient is zero, it was demonstrated that parameter corresponding to this coefficient on restricting element aperture without impact.

When heating, the interval of default medium temperature can be 20 DEG C-30 DEG C, and the interval of the intermediate pressure preset can be 1.0MPa-2.5MPa.When intermediate pressure or temperature being detected higher than setting value, open the aperture of big second section fluid element, otherwise turn down.

Relational expression between aperture LA_heat_2 and outdoor environment temperature T4 and the running frequency F of first throttle element is: LA_heat_2=x₂·F+y₂T₄+z₂, when the aperture LA_heat_2 calculated is more than the actual aperture of first throttle element gathered, by first throttle element aperture increase to calculating aperture；Otherwise turn down.Wherein, 0≤x₂≤ 25,0≤y₂≤ 25 ,-50≤z₂≤ 150, control coefrficient x, y, z can be all 0, when any of coefficient is zero, it was demonstrated that parameter corresponding to this coefficient on restricting element aperture without impact.

Such as, when freezing, setting medium temperature as 26 DEG C or setting intermediate pressure 1.65MPa, detect that outdoor environment temperature is 35 DEG C, compressor operating frequency is 58Hz, sets a₂=1.5, b₂=1.6, c₂=17.First, system adjusts the aperture of first throttle element according to the medium temperature collected or intermediate pressure value.When the medium temperature collected more than 26 DEG C or the intermediate pressure collected more than 1.65MPa time, progressively turn down the aperture (can by regulate 4 step actions) of first throttle element every time.Otherwise the aperture of turning down.Then system is according to detecting that what outdoor environment temperature and compressor operating cymometer calculated second section fluid element sets aperture as 160, then adjusts the aperture of second section fluid element to 160.After maintaining the aperture 200s of two restricting elements, detection compressor operating frequency and T4 value again, or according to user's adjustment to air-conditioning, detect compressor operating frequency and T4 value, first throttle element and second section fluid element are readjusted.

When heating, set medium temperature as 26 DEG C, intermediate pressure 1.6MPa, detect that outdoor environment temperature is 7 DEG C, compressor operating frequency is 72Hz, sets x₂=1, y₂=3.0, z₂=7.0.First system adjusts the aperture of second section fluid element according to the medium temperature collected or intermediate pressure value.When the medium temperature detected more than 26 DEG C or the intermediate pressure detected more than 1.6MPa time, progressively strengthen the aperture (can by regulate 4 step actions) of second section fluid element every time.Otherwise the aperture of turning down.Then the aperture calculating first throttle element is 100, adjusts the aperture of first throttle element to 100.After maintaining the aperture 200s of two restricting elements, detection compressor operating frequency and T4 value again, or according to user's adjustment to air-conditioning, detect compressor operating frequency and T4 value, first throttle element and second section fluid element are readjusted.

Embodiment 6:

In this embodiment, preset multiple outdoor temperatures interval, the aperture of the restricting element that each outdoor temperature interval is corresponding different, first detection object is outdoor environment temperature T4, adjusts the aperture of one-level restricting element according to the opening value that the outdoor temperature interval at the actually detected outdoor environment temperature T4 place arrived is corresponding.

T4	Aperture
		10≤T4 < 20	160
5≤T4 < 10	180
		-5≤T4 < 5	200
-10≤T4 <-5	250
		-15≤T4 <-10	300

Relational expression between aperture LA_heat_2 and outdoor environment temperature T4 and the running frequency F of first throttle element is: LA_heat_2=x₂·F+y₂T₄+z₂, when the aperture LA_heat_2 calculated is more than the actual aperture of the first throttle element gathered, the aperture of first throttle element is increased to calculating aperture；Otherwise turn down.Wherein, 0≤x₂≤ 25,0≤y₂≤ 25 ,-50≤z₂≤ 150, control coefrficient x, y, z can be all 0, when any of coefficient is zero, it was demonstrated that parameter corresponding to this coefficient on restricting element aperture without impact.

Such as, during refrigeration, detecting that outdoor environment temperature is 35 DEG C, compressor operating frequency is 58Hz, sets a₂=1.5, b₂=1.6, c₂=17.First, first system is according to collecting outdoor environment temperature T4, show that the aperture of first throttle element should be 120, adjusts the aperture of first throttle element to 120.Then system is according to detecting that what outdoor environment temperature and compressor operating cymometer calculated second section fluid element sets aperture as 160, then adjusts the aperture of second section fluid element to 160.After maintaining the aperture 200s of two restricting elements, detection compressor operating frequency and T4 value again, or according to user's adjustment to air-conditioning, detect compressor operating frequency and T4 value, first throttle element and second section fluid element are readjusted.

When heating, detecting that outdoor environment temperature is 7 DEG C, compressor operating frequency is 72Hz, sets x₂=1, y₂=3.0, z₂=7.0.First system is according to the outdoor environment temperature T4 collected, and show that the aperture of second section fluid element should be 180, adjusts the aperture of second section fluid element to 180；Then the aperture calculating first throttle element is 100, adjusts the aperture of first throttle element to 100.After maintaining the aperture 200s of two restricting elements, detection compressor operating frequency and T4 value again, or according to user's adjustment to air-conditioning, detect compressor operating frequency and T4 value, first throttle element and second section fluid element are readjusted.

It is understandable that, what above-mentioned six embodiments were merely given as specifically illustrates, the control method of the embodiment of the present invention is not limited to above-mentioned six kinds, for instance the regulative mode of the one-level restricting element in six kinds of examples and the aperture of two-step throttle element can be carried out random combine；Or the compressor operating frequency in above-described embodiment can also by actually detected to outdoor environment temperature draw, for instance preset multiple outdoor environment temperatures interval, the compressor operating frequency that multiple outdoor environment temperature intervals are corresponding different.

In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary mediate contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or be merely representative of fisrt feature level height higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be fisrt feature immediately below second feature or obliquely downward, or be merely representative of fisrt feature level height less than second feature.

In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means in conjunction with this embodiment or example describe are contained at least one embodiment or the example of the present invention.In this manual, the schematic representation of above-mentioned term is necessarily directed to identical embodiment or example.And, the specific features of description, structure, material or feature can combine in one or more embodiments in office or example in an appropriate manner.Additionally, when not conflicting, the feature of the different embodiments described in this specification or example and different embodiment or example can be carried out combining and combining by those skilled in the art.

Although above it has been shown and described that embodiments of the invention, it is understandable that, above-described embodiment is illustrative of, it is impossible to be interpreted as limitation of the present invention, and above-described embodiment can be changed, revises, replace and modification by those of ordinary skill in the art within the scope of the invention.

Claims

1. a heating and air conditioner, it is characterised in that including:

Duplex cylinder compressor, described duplex cylinder compressor includes housing, the first cylinder, the second cylinder and the first reservoir, described housing is provided with air vent, described first cylinder and described second cylinder are respectively provided in described housing, described first reservoir is located at outside described housing, the air entry of described first cylinder connects with described first reservoir, and the span of the delivery space ratio of described second cylinder and described first cylinder is 1%～10%；

Commutation assembly, described commutation assembly includes the first valve port to the 4th valve port, one of them connection in described first valve port and the second valve port and the 3rd valve port, described 4th valve port connects with another in described second valve port and described 3rd valve port, described first valve port is connected with described air vent, and described 4th valve port is connected with described first reservoir；

Outdoor heat exchanger and indoor heat exchanger, the first end of described outdoor heat exchanger is connected with described second valve port, and the first end of described indoor heat exchanger is connected with described 3rd valve port；

Gas-liquid separator, described gas-liquid separator includes gas outlet, first interface and the second interface, described gas outlet is connected with the air entry of described second cylinder, described first interface is connected with the second end of described outdoor heat exchanger, described second interface is connected with the second end of described indoor heat exchanger, it is in series with the adjustable first throttle element of aperture between described first interface and described outdoor heat exchanger, between described second interface and described indoor heat exchanger, is in series with the adjustable second section fluid element of aperture；

For the coolant radiator that electric control element is dispelled the heat, described coolant radiator tandem is between the air entry of described gas outlet and described second cylinder.

2. heating and air conditioner according to claim 1, it is characterised in that described first throttle element is electric expansion valve, described second section fluid element is electric expansion valve.

3. heating and air conditioner according to claim 1, it is characterised in that the span of the volume of described gas-liquid separator is 100mL-500mL.

4. heating and air conditioner according to claim 1, it is characterized in that, also including the first control valve and second and control valve, described first controls valve is connected with described coolant radiator tandem, and described first be connected in series controls valve and described coolant radiator and be connected in parallel with described second control valve.

5. the heating and air conditioner according to any one of claim 1-4, it is characterized in that, described duplex cylinder compressor also includes the second reservoir being located at outside described housing, and described second reservoir is connected between the air entry of described gas outlet and described second cylinder.

6. heating and air conditioner according to claim 5, it is characterised in that the volume of described first reservoir is more than the volume of described second reservoir.

7. the control method of a heating and air conditioner as claimed in one of claims 1-6, it is characterized in that, when heating and air conditioner is run, the restricting element being positioned at upstream in described first throttle element and described second section fluid element is one-level restricting element, and described first throttle element and the restricting element being positioned at downstream in described second section fluid element are two-step throttle element；

Described control method comprises the steps: first to adjust the aperture of described one-level restricting element to setting aperture according to the testing result detecting object to first, then the aperture of described two-step throttle element is adjusted to setting aperture according to the testing result detecting object to second, the setting aperture of described one-level restricting element is less than the setting aperture of described two-step throttle element, and the testing result that the testing result of described first detection object detects object from described second is different；

Wherein said first detection object includes at least one outdoor environment temperature, the running frequency of duplex cylinder compressor, the delivery temperature of air vent, the pressure at expulsion of air vent, the intermediate pressure of coolant discharged from described gas outlet, the medium temperature of coolant discharged from described gas outlet；

Described second detection object includes at least one outdoor environment temperature, the running frequency of duplex cylinder compressor, the delivery temperature of air vent, the pressure at expulsion of air vent, the intermediate pressure of coolant discharged from described gas outlet, the medium temperature of coolant discharged from described gas outlet.

8. the control method of heating and air conditioner according to claim 7, it is characterized in that, described first detection object and described second detection object are outdoor environment temperature T4 and running frequency F, the setting aperture obtaining one-level restricting element and two-step throttle element is calculated, then according to the aperture setting one-level restricting element corresponding to aperture adjustment and two-step throttle element according to the described outdoor environment temperature T4 detected and running frequency F.

9. the control method of heating and air conditioner according to claim 7, it is characterized in that, described first detection object is outdoor environment temperature T4 and running frequency F, first the setting aperture obtaining one-level restricting element is calculated according to described outdoor environment temperature T4 and described running frequency F, then according to the aperture setting the aperture described one-level restricting element of adjustment；

Described second detection object is outdoor environment temperature T4, running frequency F and pressure at expulsion；Or described second detection object is outdoor environment temperature T4, running frequency F and delivery temperature, first calculate according to described outdoor environment temperature T4 and described running frequency F and obtain setting pressure at expulsion or setting delivery temperature, then according to actually detected to pressure at expulsion or delivery temperature adjusts the aperture of two-step throttle element so that the pressure at expulsion or the delivery temperature that detect reach set pressure at expulsion or set delivery temperature.

10. the control method of heating and air conditioner according to claim 7, it is characterised in that preset multiple outdoor temperatures interval, the aperture of the restricting element that each described outdoor temperature interval is corresponding different,

First detection object is outdoor environment temperature T4, adjusts the aperture of one-level restricting element according to the opening value that the outdoor temperature interval at the actually detected outdoor environment temperature T4 place arrived is corresponding；

11. the control method of heating and air conditioner according to claim 7, it is characterized in that, preset medium temperature or default intermediate pressure, described first detection object is intermediate pressure or medium temperature, according to actually detected to intermediate pressure or medium temperature adjusts the aperture of one-level restricting element so that the intermediate pressure that detects or medium temperature reach to preset intermediate pressure or default medium temperature；

12. the control method of heating and air conditioner according to claim 7, it is characterized in that, preset medium temperature or default intermediate pressure, described first detection object is intermediate pressure or medium temperature, according to actually detected to intermediate pressure or medium temperature adjusts the aperture of one-level restricting element so that the intermediate pressure that detects or medium temperature reach to preset intermediate pressure or default medium temperature；

Described second detection object is outdoor environment temperature T4 and running frequency F, first calculates the setting aperture obtaining two-step throttle element according to described outdoor environment temperature T4 and described running frequency F, then according to the aperture setting the aperture described two-step throttle element of adjustment.

13. the control method of heating and air conditioner according to claim 7, it is characterised in that preset multiple outdoor temperatures interval, the aperture of the restricting element that each described outdoor temperature interval is corresponding different,