CN105783197A

CN105783197A - Control method for air conditioner

Info

Publication number: CN105783197A
Application number: CN201610251997.7A
Authority: CN
Inventors: 陈海群; 曾令华; 廖四清
Original assignee: Guangdong Meizhi Compressor Co Ltd; Anhui Meizhi Precision Manufacturing Co Ltd
Current assignee: Guangdong Midea Toshiba Compressor Corp; Guangdong Meizhi Compressor Co Ltd; Anhui Meizhi Precision Manufacturing Co Ltd
Priority date: 2016-04-20
Filing date: 2016-04-20
Publication date: 2016-07-20

Abstract

The invention discloses a control method for an air conditioner. The method comprises the following steps that firstly, the temperature T1 of an air supplementing loop and the temperature T2 of a flash evaporator are obtained, and T1 is compared with T2; and secondly, if the difference of T1 and T2 is larger than the preset value N, the air conditioner is kept to run in an original control mode, and if the difference between T1 and T2 is smaller than or equal to the preset value N, the content of a liquid refrigerant in a refrigerant discharged back into a compressor through the air supplementing loop is reduced. According to the control method for the air conditioner, the long-time compressor liquid impact phenomenon caused by discharging the liquid refrigerant in the air supplementing loop back to the compressor can be avoided to a certain degree, accordingly, compressor damage caused by long-time liquid impacts to the compressor from the refrigerant is avoided to a certain degree, and therefore the reliability of the compressor during wok is effectively improved.

Description

The control method of air-conditioner

Technical field

The present invention relates to air-conditioning technical field, especially relate to the control method of a kind of air-conditioner.

Background technology

Usually, air-conditioner makes it be returned directly to compression by arranging flash vessel to be separated by the gaseous refrigerant after throttling Machine, the pressure loss being so not only advantageous to minimizing compressor is simultaneously also beneficial to improve the heat exchange efficiency of heat exchanger.

But, the gas flow of the gaseous refrigerant that the flash vessel in correlation technique is separated is inadequate, containing liquid refrigerant, Compressor is easily caused long-time liquid hammer to cause compressor injury by this.

Summary of the invention

It is contemplated that one of technical problem solved the most to a certain extent in correlation technique.To this end, the present invention proposes one Plant the control method of air-conditioner, the cold-producing medium long-time liquid hammer to compressor can be avoided to a certain extent, thus avoid compression The damage of machine, can be effectively improved the reliability that compressor uses.

The control method of air-conditioner according to embodiments of the present invention, described air-conditioner includes the compression forming refrigerant circulation loop Machine, indoor heat exchanger, outdoor heat exchanger, throttling arrangement, QI invigorating loop and flash vessel, described flash vessel has first interface To the 3rd interface, described first interface is connected to the gas supplementing opening of described compressor, described second interface by described QI invigorating loop It is connected with the first end of described outdoor heat exchanger and the first end of described indoor heat exchanger respectively with described 3rd interface, described joint Stream device includes the first throttle element being connected between described outdoor heat exchanger and described second interface, described control method bag Include following steps: S1: obtain temperature T1 and temperature T2 of described flash vessel in described QI invigorating loop, by described T1 with described T2 compares；S2: if described T1-T2 ＞ preset value N, described air-conditioner keeps former control model to run；If described T1-T2≤ Preset value N, reduction flows back to the content of the liquid refrigerant in the cold-producing medium of described compressor by described QI invigorating loop.

The control method of air-conditioner according to embodiments of the present invention, by obtaining temperature T1 and the temperature of flash vessel in QI invigorating loop T2, and T1 with T2 is compared, as T1-T2 ＞ preset value N, air-conditioner keeps former control model to run, when During T1-T2≤preset value N, reduction flows back to the content of the liquid refrigerant in the cold-producing medium of compressor by QI invigorating loop, thus Avoid to a certain extent, because the liquid refrigerant in QI invigorating loop is expelled back into compressor, compressor causes long liquid hammer Phenomenon, avoids the damage of the compressor caused because compressor is produced cold-producing medium long liquid hammer the most to a certain extent, And then reliability when being effectively improved compressor operating.

According to some embodiments of the present invention, in described step S2, as T1-T2≤preset value N, can perform following dynamic At least one in work: adjust described throttling arrangement aperture, adjust outdoor fan rotating speed, adjust indoor fan rotating speed, End the connection in described QI invigorating loop and described gas supplementing opening.

According to some embodiments of the present invention, described compressor is single cylinder compressor, and described QI invigorating loop is in series with dropping valve, Described air-conditioner is single cold type air-conditioner.

Further, in step s 2, as T1-T2≤preset value N, the amount of restriction of described first throttle element is turned down.

Further, in step s 2, as T1-T2≤preset value N, described dropping valve, described first throttle unit are closed The aperture of part is constant.

According to some embodiments of the present invention, described compressor is single cylinder compressor, and described QI invigorating loop is in series with dropping valve, Described air-conditioner also includes the cross valve being located in refrigerant circulation loop.

Further, in step s 2, as T1-T2≤preset value N, when refrigeration mode, the aperture of described dropping valve is protected Holding amount of restriction that is constant and that turn described first throttle element down, when heating mode, the aperture of described dropping valve keeps constant and increases The amount of restriction of big described first throttle element.

Further, in step s 2, as T1-T2≤preset value N, close described when refrigeration mode and heating mode Dropping valve, the aperture of described first throttle element is constant.

Further, described throttling arrangement also includes the second throttling being connected in described 3rd interface and described indoor heat exchanger Element.

Further, in step s 2, as T1-T2≤preset value N, when refrigeration mode the aperture of described dropping valve and The aperture of described second section fluid element keeps amount of restriction that is constant and that turn described first throttle element down, described in when heating mode The aperture of dropping valve and the aperture of described second section fluid element keep amount of restriction that is constant and that tune up described first throttle element.

Further, in step s 2, as T1-T2≤preset value N, close described when refrigeration mode and heating mode Dropping valve, the aperture of described first throttle element and described second section fluid element is constant.

Further, in step s 2, as T1-T2≤preset value N, when refrigeration mode the aperture of described dropping valve and The aperture of described first throttle element keeps amount of restriction that is constant and that increase described second section fluid element, described in when heating mode The aperture of dropping valve and the aperture of described first throttle element keep amount of restriction that is constant and that turn described second section fluid element down.

According to some embodiments of the present invention, described compressor is multicylinder compressor, and described air-conditioner is single cold type air-conditioner.

According to some embodiments of the present invention, described compressor is multicylinder compressor, and described air-conditioner also includes being located at cold-producing medium Cross valve in closed circuit.

Further, in step s 2, as T1-T2≤preset value N, described first throttle unit is turned down when refrigeration mode The amount of restriction of part, increases the amount of restriction of described first throttle element when heating mode.

According to some embodiments of the present invention, in step s 2, as T1-T2≤preset value N, described in when refrigeration mode The aperture of second section fluid element keeps amount of restriction that is constant and that turn described first throttle element down, described in when heating mode second The aperture of restricting element keeps amount of restriction that is constant and that tune up described first throttle element.

According to some embodiments of the present invention, in step s 2, as T1-T2≤preset value N, described in when refrigeration mode The aperture of first throttle element keeps amount of restriction that is constant and that increase described second section fluid element, described in when heating mode first The aperture of restricting element keeps amount of restriction that is constant and that turn described second section fluid element down.

According to some embodiments of the present invention, described QI invigorating loop is provided with three-way valve, and described three-way valve includes the first valve port extremely 3rd valve port, described first valve port is connected with described first interface, and described second valve port is connected with described gas supplementing opening, and described Three valve ports are connected with the reservoir of described compressor, its in described second valve port and described first valve port and described 3rd valve port In a connection, when described T1-T2 ＞ preset value N, described three-way valve action makes the second valve port and described first valve port Connection；If described T1-T2≤preset value N, described three-way valve action makes described second valve port connect with described 3rd end valve mouth.

Accompanying drawing explanation

Fig. 1 is the structural representation of air-conditioner according to some embodiments of the invention；

Fig. 2 is the structural representation of the air-conditioner according to other embodiments of the present invention；

Fig. 3 is the structural representation of the air-conditioner according to still other embodiments of the present invention；

Fig. 4 is the structural representation of the air-conditioner according to yet other embodiments of the invention；

Fig. 5 is the structural representation of the air-conditioner according to yet other embodiments of the invention；

Fig. 6 is the structural representation of the air-conditioner according to yet other embodiments of the invention；

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

Reference:

Air-conditioner 100；

Compressor 1；Gas supplementing opening 11；Gas returning port 12；Air vent 13；

Indoor heat exchanger 2；

Cross valve 3；First port A；Second port B；3rd port C；4th port D；

Outdoor heat exchanger 4；

Throttling arrangement 5；First throttle element 51；Second section fluid element 52；

QI invigorating loop 6；Dropping valve 61；

Flash vessel 7；First interface 71；Second interface 72；3rd interface 73；

Three-way valve 8；First valve port 81；Second valve port 82；3rd valve port 83；Connecting tube 84；

Reservoir 9.

Detailed description of the invention

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

In describing the invention, it is to be understood that term " on ", D score, "left", "right", etc. instruction orientation or position Relation of putting for based on orientation shown in the drawings or position relationship, be for only for ease of the description present invention and simplifying describe rather than Instruction or hint indication device or element must have specific orientation, with specific azimuth configuration and operation, therefore can not It is interpreted as limitation of the present invention.

Below with reference to the control method of Fig. 1-Fig. 7 description air-conditioner 100 according to embodiments of the present invention, can be used for controlling Air-conditioner 100.

First, the air-conditioner 100 using control method according to embodiments of the present invention, air-conditioner are described with reference to Fig. 1-Fig. 6 100 can be used for regulating indoor temperature.It is understood that the air-conditioner 100 in the embodiment of the present invention can be single cold type Air-conditioner, naturally it is also possible to be heating and air conditioner.

As shown in figs 1 to 6, air-conditioner 100 can include forming the compressor 1 of refrigerant circulation loop, indoor heat exchanger 2, outdoor heat exchanger 4, throttling arrangement 5, QI invigorating loop 6 and flash vessel 7.Wherein, compressor 1 have air vent 13, Gas returning port 12 and gas supplementing opening 11.Cold-producing medium returns in compressor 1 from gas returning port 12 and the gas supplementing opening 11 of compressor 1, warp The cold-producing medium of the High Temperature High Pressure formed after compressor 1 compression is discharged from air vent 13.Alternatively, the gas returning port of compressor 1 12 and gas supplementing opening 11 can be same port, such as, as Figure 4-Figure 6, certainly, the gas returning port 12 of compressor 1 Can also be two different ports with gas supplementing opening 11, such as, as shown in Figure 1-Figure 3, this be not especially limited by the present invention.

Alternatively, compressor 1 can be single cylinder compressor, and the most as Figure 4-Figure 6, compressor 1 is for having a gas The compressor of cylinder.Certainly, compressor 1 can also is that multicylinder compressor.It is understood that multicylinder compressor is for having two Individual or the compressor of two or more cylinder, such as, compressor 1 as shown in Figure 1-Figure 3 is the compressor with two cylinders.

Flash vessel 7 has first interface 71 and is connected to compressor to the 3rd interface 73, first interface 71 by QI invigorating loop 6 The gas supplementing opening 11 of 1, thus, the part gaseous refrigerant in flash vessel 7 can be by QI invigorating loop 6 and through compressor 1 Gas supplementing opening 11 returns to compressor 1, and on the one hand this advantageously reduce the pressure loss of compressor 1, on the other hand after throttling It is not involved in the gaseous refrigerant of heat exchange to separate and also advantageously improve indoor heat exchanger 2 or the heat transfer effect of outdoor heat exchanger 4 (such as, when air-conditioner 100 freezes, be conducive to improving the heat transfer effect of indoor heat exchanger 2, when air-conditioner 100 heats, Be conducive to improving the heat transfer effect of outdoor heat exchanger 4).

Second interface 72 and the 3rd interface 73 respectively with the first end and the first end phase of indoor heat exchanger 2 of outdoor heat exchanger 4 Even, throttling arrangement 5 includes the first throttle element 51 being connected between outdoor heat exchanger 4 and the second interface 72, thus shape Become the closed circuit of cold-producing medium so that the circulation of cold-producing medium.It should be noted that about the refrigerant cycle of air-conditioner 100 In loop, concrete flow direction of cold-producing medium will become clear from the description below, and the most no longer describes.

Below with reference to the accompanying drawings describing the control method of air-conditioner 100 according to embodiments of the present invention, air-conditioner 100 is above-mentioned reality Execute the air-conditioner 100 described in example.

As it is shown in fig. 7, the control method of air-conditioner 100 comprises the steps:

S1: obtain temperature T1 and temperature T2 of flash vessel 7 in QI invigorating loop 6, T1 with T2 is compared.Such as, Air-conditioner 100 can include that pressure-detecting device (not shown) and temperature-detecting device (not shown) are to detect respectively The pressure P in QI invigorating loop 6 and temperature T2 of flash vessel 7, according to cold-producing medium saturation temperature and Pressure gauge, search and return with QI invigorating Temperature T1 in the QI invigorating loop 6 corresponding for pressure P on road 6, and T1 with T2 found is compared.

S2: if T1-T2 is ＞ preset value N, does not now have cold-producing medium in liquid refrigerant or QI invigorating loop 6 in QI invigorating loop 6 Contained amount of liquid refrigerant is less, and compressor 1 will not produce liquid hammer or will not be because a small amount of liquid refrigerant is to compression Machine 1 produces liquid hammer and compressor 1 is produced damage, and air-conditioner 100 keeps former control model to run；If T1-T2≤preset value N, reduction flows back to the content of the liquid refrigerant in the cold-producing medium of compressor 1 to keep away to a certain extent by QI invigorating loop 6 Exempt from, because the liquid refrigerant in QI invigorating loop 6 is persistently expelled back into compressor 1, compressor 1 causes long liquid hit phenomenon, Avoid the damage of the compressor 1 caused because compressor 1 is produced cold-producing medium long liquid hammer the most to a certain extent, And then it is effectively improved reliability when compressor 1 works.

Alternatively, preset value N meets: 0 DEG C≤N≤10 DEG C.

The control method of air-conditioner 100 according to embodiments of the present invention, by obtaining temperature T1 and the flash vessel in QI invigorating loop 6 Temperature T2 of 7, and T1 with T2 is compared, as T1-T2 ＞ preset value N, air-conditioner 100 keeps former control mould Formula is run, and as T1-T2≤preset value N, reduces the liquid refrigeration in the cold-producing medium being flow back to compressor 1 by QI invigorating loop 6 The content of agent, thus avoid to a certain extent because the liquid refrigerant in QI invigorating loop 6 is expelled back into compressor 1 and to compression Machine 1 causes long liquid hit phenomenon, avoids the most to a certain extent because cold-producing medium produces long liquid to compressor 1 The damage of the compressor 1 hit and cause, and then it is effectively improved reliability when compressor 1 works.

It is understood that as T1-T2≤preset value N, any control device can be used to reduce and to flow back to from QI invigorating loop 6 The content of the liquid refrigerant in the cold-producing medium of compressor 1.Such as according to some embodiments of the present invention, in step S2, when During T1-T2≤preset value N, at least one in following action can be performed: adjust the aperture of throttling arrangement 5, adjust outdoor The rotating speed of blower fan, adjust the rotating speed of indoor fan, the connection of cut-off QI invigorating loop 6 and gas supplementing opening 11 is returned by QI invigorating with reduction Road 6 flows back to the content of the liquid refrigerant in the cold-producing medium of compressor 1, thus avoids to a certain extent because of QI invigorating loop 6 In liquid refrigerant be expelled back into compressor 1 and compressor 1 caused long liquid hit phenomenon, the most to a certain extent Avoid the damage of the compressor 1 caused because compressor 1 is produced cold-producing medium long liquid hammer, and then be effectively improved pressure Reliability when contracting machine 1 works.

Such as, when air-conditioner 100 freezes and during T1-T2≤preset value N, reduce to reduce by the rotating speed of control room inner blower The temperature of indoor heat exchanger 2, and/or control the rotating speed reduction of outdoor fan to increase the temperature of outdoor heat exchanger 4；Work as air-conditioning Device 100 heats and during T1-T2≤preset value N, reduces to increase the temperature of indoor heat exchanger 2 by the rotating speed of control room inner blower Degree, and/or control the rotating speed reduction temperature with reduction outdoor heat exchanger 4 of outdoor fan, thus reduce by QI invigorating loop 6 Flow back to the content of liquid refrigerant in the cold-producing medium of compressor 1.

According to some embodiments of the present invention, with reference to shown in Fig. 4, compressor 1 is single cylinder compressor.Go here and there on QI invigorating loop 6 Being associated with dropping valve 61, air-conditioner 100 is single cold type air-conditioner.Wherein, by control dropping valve 61 be turned on and off can For controlling being turned on or off of QI invigorating loop 6.Alternatively, gas returning port 12 and the gas supplementing opening 11 of compressor 1 can be Same port is such as shown in Fig. 4, certainly, the gas returning port 12 of compressor 1 can also is that with gas supplementing opening 11 two different Port.

Specifically, second end (such as, the left end shown in Fig. 4) of outdoor heat exchanger 4 and the aerofluxus of compressor 1 Mouth 13 is connected, second end (such as, the left end shown in Fig. 4) of indoor heat exchanger 2 and the gas returning port of compressor 1 12 are connected, from the cold-producing medium of the High Temperature High Pressure of air vent 13 discharge of compressor 1 through outdoor heat exchanger 4, and in room External heat exchanger 4 and outdoor environment carry out heat exchange, and the cold-producing medium after heat exchange flows after first throttle element 51 reducing pressure by regulating flow Some liquid refrigerant in flash vessel 7, flash vessel 7 flows to indoor heat exchanger 2 through the 3rd interface 73, and Carrying out heat exchange in indoor heat exchanger 2 with indoor environment with to indoor refrigeration, the cold-producing medium after heat exchange is through compressor 1 Gas returning port 12 returns to compressor 1, in the running of air-conditioner 100, when T1-T2 is more than preset value N, Another part cold-producing medium of flash vessel 7 is through QI invigorating loop 6 and the dropping valve 61 being connected on QI invigorating loop 6, and warp The gas supplementing opening 11 of overcompression machine 1 returns to compressor 1.

Specifically, when air-conditioner 100 runs, in step s 2, as T1-T2≤preset value N, can be by turning down The amount of restriction of first throttle element 51 flows through the refrigerant temperature of first throttle element 51 to reduce, thus reduces and pass through QI invigorating Loop 6 flows back to the content of the liquid refrigerant in the cold-producing medium of compressor 1 to avoid to a certain extent because of in QI invigorating loop 6 Liquid refrigerant be expelled back into compressor 1 and compressor 1 caused long liquid hit phenomenon, thus keep away to a certain extent Exempt from the damage of the compressor 1 caused because compressor 1 is produced cold-producing medium long liquid hammer, and then be effectively improved compression Reliability when machine 1 works.Certainly, the invention is not restricted to this, in other embodiments, in step s 2, when T1-T2≤ During preset value N, it is also possible to by closing dropping valve 61, and make that the aperture of first throttle element 51 is constant returns with cut-off QI invigorating Road 6 and the connection of gas supplementing opening 11, thus avoid the cold-producing medium in QI invigorating loop 6 to flow to compressor 1 by gas supplementing opening 11.

In other embodiments of the present invention, with reference to shown in Fig. 5, compressor 1 is single cylinder compressor.On QI invigorating loop 6 It is in series with dropping valve 61.Thus, by control dropping valve 61 be turned on and off may be used for controlling the leading of QI invigorating loop 6 On-off is opened.Alternatively, gas returning port 12 and the gas supplementing opening 11 of compressor 1 can be same port, certainly, compressor The gas returning port 12 of 1 can also is that two different ports with gas supplementing opening 11.

With reference to shown in 5, air-conditioner 100 also includes the cross valve 3 being located in refrigerant circulation loop, thus realizes air-conditioner The refrigeration of 100 and heat-production functions.Specifically, cross valve 3 includes the first port A to the 4th port D, wherein, first One of them connection in port A and the second port B and the 3rd port C, the 4th port D and the second port B and the 3rd Another connection in port C, say, that when the first port A and the second port B connects, the 4th port D is then Connecting with the 3rd port C, when the first port A and the 3rd port C connects, the 4th port D is then with the second port B even Logical.It addition, the first port A is connected with air vent 13, the 4th port D is connected with gas returning port 12.Outdoor heat exchanger 4 Second end and the second port B are connected, and the second end of indoor heat exchanger 2 and the 3rd port C are connected, thus by cross valve 3 even It is connected in refrigerant circulation loop so that the circulation of cold-producing medium.When air-conditioner 100 freezes, the first port A and the second end Mouth B connection, the 3rd port C and the 4th port D connection, the refrigeration of the High Temperature High Pressure that the air vent 13 of compressor 1 is discharged Agent flows to outdoor heat exchanger 4 through the first port A and the second port B, and carries out with outdoor environment in outdoor heat exchanger 4 Heat exchange, the cold-producing medium after heat exchange flows to flash vessel 7 after first throttle element 51 reducing pressure by regulating flow.In flash vessel 7 Some liquid refrigerant flows to indoor heat exchanger 2 through the 3rd interface 73, and in indoor heat exchanger 2 and indoor environment Carrying out heat exchange with to indoor refrigeration, cold-producing medium is through the 3rd port C and the 4th port D subsequently, and through compressor 1 Gas returning port 12 return to compressor 1；In the running of air-conditioner 100, when T1-T2 is more than preset value N, Another part cold-producing medium of flash vessel 7 is through QI invigorating loop 6 and the dropping valve 61 being connected on QI invigorating loop 6, and warp The gas supplementing opening 11 of overcompression machine 1 returns to compressor 1.

When air-conditioner 100 heats, the first port A and the 3rd port C connection, the second port B and the 4th port D connection, Indoor are flowed to through the first port A and the 3rd port C from the cold-producing medium of the High Temperature High Pressure of air vent 13 discharge of compressor 1 Heat exchanger 2, and carry out heat exchange with indoor environment in indoor heat exchanger 2, the cold-producing medium after heat exchange flows through the 3rd interface 73 To flash vessel 7.Some refrigerant in flash vessel 7 flows out from the second interface 72, and throttles through first throttle element 51 Flowing to outdoor heat exchanger 4 after blood pressure lowering, cold-producing medium carries out heat exchange with outdoor environment in outdoor heat exchanger 4, the refrigeration after heat exchange Agent returns to compressor 1 through the second port B and the 4th port D and through the gas returning port 12 of compressor 1；At air-conditioner In the running of 100, when T1-T2 is more than preset value N, another part cold-producing medium in flash vessel 7 connects through first Mouth 71 flows to QI invigorating loop 6 and the dropping valve 61 being connected on QI invigorating loop 6, and through the gas supplementing opening 11 of compressor 1 Return to compressor 1.

Specifically, when air-conditioner 100 runs, in step s 2, as T1-T2≤preset value N, when refrigeration mode The aperture making dropping valve 61 keeps amount of restriction that is constant and that turn first throttle element 51 down, makes dropping valve 61 when heating mode Aperture keep constant and increase first throttle element 51 amount of restriction, thus reduce flow back to compressor 1 by QI invigorating loop 6 Cold-producing medium in the content of liquid refrigerant.Certainly, the invention is not restricted to this, in other embodiments, in step s 2, As T1-T2≤preset value N, first throttle can also be made by closing dropping valve 61 when refrigeration mode and heating mode The aperture of element 51 is constant with cut-off QI invigorating loop 6 and the connection of gas supplementing opening 11, thus avoids the refrigeration in QI invigorating loop 6 Agent flows to compressor 1 by gas supplementing opening 11, improves reliability when compressor 1 works.

Further, as shown in Figure 6, throttling arrangement 5 also includes be connected in the 3rd interface 73 and indoor heat exchanger 2 Two restricting elements 52.Specifically, when air-conditioner 100 freezes, the first port A and the second port B connection, the 3rd end Mouth C and the 4th port D connection, the cold-producing medium of the High Temperature High Pressure that the air vent 13 of compressor 1 is discharged is through the first port A Flow to outdoor heat exchanger 4 with the second port B, and carry out heat exchange with outdoor environment in outdoor heat exchanger 4, the system after heat exchange Cryogen flows to flash vessel 7 after first throttle element 51 reducing pressure by regulating flow.Some liquid refrigerant warp in flash vessel 7 Cross the 3rd interface 73 and flow to second section fluid element 52, after second section fluid element 52 reducing pressure by regulating flow, flow to indoor heat exchanger 2, and in indoor heat exchanger 2, carry out heat exchange with indoor environment with to indoor refrigeration, cold-producing medium is through the 3rd port subsequently C and the 4th port D, and return to compressor 1 through the gas returning port 12 of compressor 1；Operation at air-conditioner 100 During, when T1-T2 is more than preset value N, another part cold-producing medium of flash vessel 7 is through QI invigorating loop 6 and series connection Dropping valve 61 on QI invigorating loop 6, and return to compressor 1 through the gas supplementing opening 11 of compressor 1.

When air-conditioner 100 heats, the first port A and the 3rd port C connection, the second port B and the 4th port D connection, Indoor are flowed to through the first port A and the 3rd port C from the cold-producing medium of the High Temperature High Pressure of air vent 13 discharge of compressor 1 Heat exchanger 2, and carry out heat exchange with indoor environment in indoor heat exchanger 2, the cold-producing medium after heat exchange is through second section fluid element After 52 reducing pressure by regulating flows, flow to flash vessel 7 through the 3rd interface 73.Some refrigerant in flash vessel 7 is from the second interface 72 Flowing out, and flow to outdoor heat exchanger 4 after the further reducing pressure by regulating flow of first throttle element 51, cold-producing medium is at outdoor heat exchanger Carrying out heat exchange with outdoor environment in 4, the cold-producing medium after heat exchange is through the second port B and the 4th port D and through compressor 1 Gas returning port 12 return to compressor 1；In the running of air-conditioner 100, when T1-T2 is more than preset value N, dodge Another part cold-producing medium in steaming device 7 flows to QI invigorating loop 6 and the fall being connected on QI invigorating loop 6 through first interface 71 Pressure valve 61, and return to compressor 1 through the gas supplementing opening 11 of compressor 1.

Specifically, when air-conditioner 100 runs, in step s 2, as T1-T2≤preset value N, when refrigeration mode The aperture of dropping valve 61 and the aperture of second section fluid element 52 is made to keep amount of restriction that is constant and that turn first throttle element 51 down, Make the aperture of dropping valve 61 and the aperture of second section fluid element 52 keep constant and tune up first throttle element when heating mode The amount of restriction of 51, thus the content of the liquid refrigerant in reducing the cold-producing medium being flow back to compressor 1 by QI invigorating loop 6.When So, the invention is not restricted to this, in other embodiments, in step s 2, as T1-T2≤preset value N, at refrigeration mould When formula and heating mode, it is also possible to close dropping valve 61 so that first throttle element 51 and the aperture of second section fluid element 52 Constant with cut-off QI invigorating loop 6 and the connection of gas supplementing opening 11, thus avoid the cold-producing medium in QI invigorating loop 6 by gas supplementing opening 11 Flow to compressor 1.Or, in step s 2, as T1-T2≤preset value N, blood pressure lowering can also be made when refrigeration mode The aperture of valve 61 and the aperture of first throttle element 51 keep amount of restriction that is constant and that increase second section fluid element 52, are heating The aperture of dropping valve 61 and the aperture of first throttle element 51 is made to keep joint that is constant and that turn second section fluid element 52 down during pattern Flow, thus the content of the liquid refrigerant in reducing the cold-producing medium being flow back to compressor 1 by QI invigorating loop 6.

In the other embodiment of the present invention, with reference to shown in Fig. 1, compressor 1 is multicylinder compressor such as duplex cylinder compressor. Air-conditioner 100 is single cold type air-conditioner.Alternatively, gas returning port 12 and the gas supplementing opening 11 of compressor 1 can be same end Mouthful, certainly, the gas returning port 12 of compressor 1 can also is that two different ports with gas supplementing opening 11, such as, such as Fig. 1 institute Showing, the gas returning port 12 of compressor 1 is respectively provided on two different cylinders of multicylinder compressor with gas supplementing opening 11.

Specifically, second end (such as, the left end shown in Fig. 1) of outdoor heat exchanger 4 and the air vent of compressor 1 13 are connected, second end (such as, the left end shown in Fig. 1) of indoor heat exchanger 2 and the gas returning port 12 of compressor 1 It is connected, from the cold-producing medium of the High Temperature High Pressure of air vent 13 discharge of compressor 1 through outdoor heat exchanger 4, and in outdoor Heat exchanger 4 and outdoor environment carry out heat exchange, and the cold-producing medium after heat exchange flows to after first throttle element 51 reducing pressure by regulating flow Flash vessel 7, the some liquid refrigerant in flash vessel 7 flows to indoor heat exchanger 2 through the 3rd interface 73, and in room Heat exchange is carried out with indoor environment with to indoor refrigeration, the returning through compressor 1 of the cold-producing medium after heat exchange in interior heat exchanger 2 QI KOU 12 returns to compressor 1, and another part cold-producing medium of flash vessel 7 is through QI invigorating loop 6 and through compressor 1 Gas supplementing opening 11 return to compressor 1.

Specifically, when air-conditioner 100 runs, in step s 2, as T1-T2≤preset value N, can be by turning down The amount of restriction of one restricting element 51 flows through the refrigerant temperature of first throttle element 51 to reduce, thus reduces and returned by QI invigorating Road 6 flows back to the content of the liquid refrigerant in the cold-producing medium of compressor 1, improves reliability when compressor 1 works.

In the still other embodiments of the present invention, with reference to shown in Fig. 2, compressor 1 is multicylinder compressor.Alternatively, compression The gas returning port 12 of machine 1 and gas supplementing opening 11 can be same port, certainly, and the gas returning port 12 of compressor 1 and gas supplementing opening 11 Can also is that two different ports, such as, as shown in Figure 2, the gas returning port 12 of compressor 1 and gas supplementing opening 11 are respectively It is located on two different cylinders of multicylinder compressor.

Air-conditioner 100 also includes the cross valve 3 being located in refrigerant circulation loop, thus realizes refrigeration and the system of air-conditioner 100 Hot merit energy.Wherein it is desired to explanation, the concrete structure of cross valve 3 and the first port A to the 4th end of cross valve 3 D is identical be outlined above with the annexation of other structure of air-conditioner 100 for mouth, the most no longer repeats.

Specifically, when air-conditioner 100 freezes, the first port A and the second port B connection, the 3rd port C and the 4th Port D connects, and the cold-producing medium of the High Temperature High Pressure that the air vent 13 of compressor 1 is discharged is through the first port A and the second port B flows to outdoor heat exchanger 4, and carries out heat exchange with outdoor environment in outdoor heat exchanger 4, and the cold-producing medium after heat exchange is through the Flash vessel 7 is flowed to after one restricting element 51 reducing pressure by regulating flow.Some liquid refrigerant in flash vessel 7 is through the 3rd interface 73 flow to indoor heat exchanger 2, and carry out heat exchange in indoor heat exchanger 2 with indoor environment with to indoor refrigeration, subsequently Cold-producing medium is through the 3rd port C and the 4th port D, and returns to compressor 1 through the gas returning port 12 of compressor 1, Another part cold-producing medium of flash vessel 7 returns to compressor through QI invigorating loop 6 and through the gas supplementing opening 11 of compressor 1 1。

When air-conditioner 100 heats, the first port A and the 3rd port C connection, the second port B and the 4th port D connection, Indoor are flowed to through the first port A and the 3rd port C from the cold-producing medium of the High Temperature High Pressure of air vent 13 discharge of compressor 1 Heat exchanger 2, and carry out heat exchange with indoor environment in indoor heat exchanger 2, the cold-producing medium after heat exchange flows through the 3rd interface 73 Some refrigerant in flash vessel 7, flash vessel 7 flows out from the second interface 72, and throttles through first throttle element 51 Flowing to outdoor heat exchanger 4 after blood pressure lowering, cold-producing medium carries out heat exchange with outdoor environment in outdoor heat exchanger 4, the refrigeration after heat exchange Agent returns to compressor 1, flash vessel 7 through the second port B and the 4th port D and through the gas returning port 12 of compressor 1 In another part cold-producing medium flow to QI invigorating loop 6 through first interface 71, and return through the gas supplementing opening 11 of compressor 1 To compressor 1.

Specifically, when air-conditioner 100 runs, in step s 2, as T1-T2≤preset value N, when refrigeration mode The amount of restriction of first throttle element 51 can be turned down, the amount of restriction of first throttle element 51 can be increased when heating mode to reduce Flow back to the content of liquid refrigerant in the cold-producing medium of compressor 1 by QI invigorating loop 6, thus avoid to a certain extent because of Liquid refrigerant in QI invigorating loop 6 is expelled back into compressor 1 and compressor 1 causes long liquid hit phenomenon, then exists Avoid the damage of the compressor 1 caused because compressor 1 is produced cold-producing medium long liquid hammer, Jin Eryou to a certain extent Effect ground improves reliability when compressor 1 works.

Further, with reference to shown in Fig. 2, throttling arrangement 5 also includes being connected in the 3rd interface 73 and indoor heat exchanger 2 Second section fluid element 52.Specifically, when air-conditioner 100 freezes, the first port A and the second port B connection, the 3rd Port C and the 4th port D connection, the cold-producing medium of the High Temperature High Pressure that the air vent 13 of compressor 1 is discharged is through the first port A and the second port B flows to outdoor heat exchanger 4, and carries out heat exchange, after heat exchange with outdoor environment in outdoor heat exchanger 4 Cold-producing medium flows to flash vessel 7 after first throttle element 51 reducing pressure by regulating flow.Some liquid refrigerant in flash vessel 7 Flow to second section fluid element 52 through the 3rd interface 73, after second section fluid element 52 reducing pressure by regulating flow, flow to indoor heat exchange Device 2, and in indoor heat exchanger 2, carry out heat exchange with indoor environment with to indoor refrigeration, cold-producing medium is through the 3rd end subsequently Mouthful C and the 4th port D, and return to compressor 1 through the gas returning port 12 of compressor 1；Another portion of flash vessel 7 Point cold-producing medium returns to compressor 1 through QI invigorating loop 6 and through the gas supplementing opening 11 of compressor 1.

When air-conditioner 100 heats, the first port A and the 3rd port C connection, the second port B and the 4th port D connection, Indoor are flowed to through the first port A and the 3rd port C from the cold-producing medium of the High Temperature High Pressure of air vent 13 discharge of compressor 1 Heat exchanger 2, and carry out heat exchange with indoor environment in indoor heat exchanger 2, the cold-producing medium after heat exchange is through second section fluid element After the reducing pressure by regulating flow of 52, flow to flash vessel 7 through the 3rd interface 73.Some refrigerant in flash vessel 7 is from the second interface 72 flow out, and flow to outdoor heat exchanger 4 after first throttle element 51 reducing pressure by regulating flow, and cold-producing medium is in outdoor heat exchanger 4 Carrying out heat exchange with outdoor environment, the cold-producing medium after heat exchange is through the second port B and the 4th port D returning through compressor 1 QI KOU 12 returns to compressor 1；Another part cold-producing medium in flash vessel 7 flows to QI invigorating loop 6 through first interface 71 And return to compressor 1 through the gas supplementing opening 11 of compressor 1.

Specifically, when air-conditioner 100 runs, in step s 2, as T1-T2≤preset value N, when refrigeration mode The aperture that can make second section fluid element 52 keeps constant and turns the amount of restriction of first throttle element 51 down, when heating mode the The aperture of two restricting elements 52 keeps amount of restriction that is constant and that tune up first throttle element 51 to reduce by QI invigorating loop 6 row Return the content of liquid refrigerant in the cold-producing medium of compressor 1, thus avoid to a certain extent because of the liquid in QI invigorating loop 6 State cold-producing medium is expelled back into compressor 1 and compressor 1 causes long liquid hit phenomenon, avoid the most to a certain extent because of The damage of the compressor 1 that cold-producing medium produces long liquid hammer to compressor 1 and causes, and then it is effectively improved compressor 1 Reliability during work.Certainly, the invention is not restricted to this, in step s 2, as T1-T2≤preset value N, in refrigeration The aperture that can also make first throttle element 51 during pattern keeps amount of restriction that is constant and that increase second section fluid element 52, in system The aperture making first throttle element 51 during heat pattern keeps amount of restriction that is constant and that turn second section fluid element 52 down to pass through to reduce QI invigorating loop 6 flows back to the content of the liquid refrigerant in the cold-producing medium of compressor 1, it is ensured that the reliability service of compressor 1.

According to some embodiments of the present invention, with reference to shown in Fig. 3, QI invigorating loop 6 is provided with three-way valve 8, and three-way valve 8 includes First valve port 81 to the 3rd valve port 83, the first valve port 81 is connected with first interface 71, the second valve port 82 and gas supplementing opening 11 Being connected, the 3rd valve port 83 is connected with the reservoir 9 of compressor 1 (such as, as it is shown on figure 3, the 3rd valve port 83 is by even Adapter 84 is connected with the upper end of reservoir 9).Wherein, its in the second valve port 82 and the first valve port 81 and the 3rd valve port 83 In a connection, thus, when the second valve port 82 connects with the first valve port 81, the QI invigorating of first interface 71 and compressor 1 Mouth 11 connection, now from the cold-producing medium of first interface 71 discharge of flash vessel 7 through QI invigorating loop the 6, first valve port 81 and Second valve port 82 flows to the gas supplementing opening 11 of compressor 1；When the second valve port 82 connects with the 3rd valve port 83, first interface 71 are not turned on, with the gas supplementing opening 11 of compressor 1, the connection that ends QI invigorating loop 6 with gas supplementing opening 11.

The reservoir 9 of compressor 1 is connected so that the cold-producing medium in reservoir 9 passes through return-air with the gas returning port 12 of compressor 1 Mouth 12 returns to compressor 1.Herein it is understood that the gas returning port 12 of compressor 1 and gas supplementing opening 11 be two different Port.Alternatively, compressor 1 can be single cylinder compressor, and certain compressor 1 can also is that multicylinder compressor is such as schemed Duplex cylinder compressor shown in 3.The most alternatively, when compressor 1 is multicylinder compressor, the return-air of compressor 1 Mouthfuls 12 with on two different cylinders that gas supplementing opening 11 is respectively provided in multicylinder compressor.

When air-conditioner 100 runs, when T1-T2 ＞ preset value N, three-way valve 8 action so that the second valve port 82 with First valve port 81 connects so that gas supplementing opening 11 connects with first interface 71, and now the cold-producing medium in QI invigorating loop 6 can be through three First valve port 81 of logical valve 8 and the second valve port 82 also return to compressor 1 through the gas supplementing opening 11 of compressor 1；If T1-T2≤ Preset value N, the second valve port 82 is connected with the 3rd valve port 83 in three-way valve 8 action so that gas supplementing opening 11 and first interface 71 Disconnect.

Specifically, such as, when air-conditioner 100 is single cold type air-conditioner 100, the second end of outdoor heat exchanger 4 and row QI KOU 13 connects, and the second end of indoor heat exchanger 2 is connected with reservoir 9, and (such as, the second end of indoor heat exchanger 2 connects To above-mentioned connecting tube 84 to be connected with reservoir 9), the refrigerant flow direction of the High Temperature High Pressure that the air vent 13 of compressor 1 is discharged Outdoor heat exchanger 4, and in outdoor heat exchanger 4 with outdoor environment heat exchange, the cold-producing medium after heat exchange is through first throttle element Flash vessel 7 is flowed to after 51 reducing pressure by regulating flows.In the running of air-conditioner 100, as T1-T2 ＞ preset value N, threeway Valve 8 action makes the first valve port 81 connect with the second valve port 82 so that gas supplementing opening 11 and first interface 71 connect, and now dodges Part of refrigerant in steaming device 7 flows out from the 3rd interface 73, and flows to indoor heat exchanger 2, and cold-producing medium is at indoor heat exchanger Flow to reservoir 9 after 2 heat exchange, and return to compressor 1 from gas returning port 12；Another part cold-producing medium of flash vessel 7 is from One interface 71 flows out, and through QI invigorating loop 6, and through the first valve port 81 of three-way valve 8 and the second valve port 82 and pass through The gas supplementing opening 11 of compressor 1 returns to compressor 1；As T1-T2≤preset value N, three-way valve 8 action makes the 3rd valve Mouthfuls 83 connect so that gas supplementing opening 11 and first interface 71 disconnect with the second valve port 82, now the cold-producing medium in flash vessel 7 from 3rd interface 73 flows out, and flows to indoor heat exchanger 2, and cold-producing medium flows in indoor heat exchanger 2 heat exchange and from indoor heat exchanger 2 After going out, part of refrigerant flows to reservoir 9, and returns to compressor 1 from gas returning port 12, and another part cold-producing medium passes through 3rd valve port 83 of three-way valve 8 and the second valve port 82 also return to compressor 1 through the gas supplementing opening 11 of compressor 1.

Certainly, in other embodiments, air-conditioner 100 can be also heating and air conditioner 100.Such as, air-conditioner 100 includes Cross valve 3.Herein it should be noted that the concrete structure of cross valve 3 and the first port A to the 4th end of cross valve 3 D is identical be outlined above with the annexation of other structure of air-conditioner 100 for mouth.Wherein, the 4th end of cross valve 3 Mouth D is connected with gas returning port 12 by reservoir 9.When air-conditioner 100 freezes, the first port A and the second port B is even Logical, the 3rd port C and the 4th port D connection, the cold-producing medium of the High Temperature High Pressure that the air vent 13 of compressor 1 is discharged passes through First port A and the second port B flows to outdoor heat exchanger 4, and carries out heat exchange with outdoor environment in outdoor heat exchanger 4, Cold-producing medium after heat exchange flows to flash vessel 7 after first throttle element 51 reducing pressure by regulating flow.Operation at air-conditioner 100 Cheng Zhong, as T1-T2 ＞ preset value N, three-way valve 8 action makes the first valve port 81 connect so that mending with the second valve port 82 QI KOU 11 connects with first interface 71, and now the some refrigerant in flash vessel 7 flows out from the 3rd interface 73, and flows to room Interior heat exchanger 2, cold-producing medium flows to cross valve 3 through the 3rd port C after indoor heat exchanger 2 heat exchange, and cold-producing medium is from subsequently Four port D flow out and flow to reservoir 9, and return to compressor 1 from gas returning port 12, another part refrigeration of flash vessel 7 Agent is flowed out from first interface 71, and through QI invigorating loop 6, and through the first valve port 81 and the second valve port 82 of three-way valve 8 And return to compressor 1 through the gas supplementing opening 11 of compressor 1；As T1-T2≤preset value N, three-way valve 8 action makes 3rd valve port 83 connects with the second valve port 82 so that gas supplementing opening 11 and first interface 71 disconnect, now the system in flash vessel 7 Cryogen flows out from the 3rd interface 73, and flows to indoor heat exchanger 2, cold-producing medium after indoor heat exchanger 2 heat exchange through the 3rd end Mouth C flows to cross valve 3, and flows out from cross valve 3 through the 4th port D, and now part of refrigerant flows to reservoir 9, And returning to compressor 1 from gas returning port 12, another part cold-producing medium is through the 3rd valve port 83 and the second valve port of three-way valve 8 82 and return to compressor 1 through the gas supplementing opening 11 of compressor 1.

When air-conditioner 100 heats, the first port A and the 3rd port C connection, the second port B and the 4th port D connection, Indoor are flowed to through the first port A and the 3rd port C from the cold-producing medium of the High Temperature High Pressure of air vent 13 discharge of compressor 1 Heat exchanger 2, and carry out heat exchange with indoor environment in indoor heat exchanger 2, the cold-producing medium after heat exchange flows through the 3rd interface 73 To flash vessel 7.In the running of air-conditioner 100, as T1-T2 ＞ preset value N, three-way valve 8 action makes One valve port 81 connects with the second valve port 82 so that gas supplementing opening 11 and first interface 71 connect, now in flash vessel 7 Cold-producing medium is divided to flow out from the second interface 72 and flow to outdoor heat exchanger 4 after first throttle element 51 reducing pressure by regulating flow, refrigeration Agent flows to reservoir 9 through the second port B and the 4th port D after outdoor heat exchanger 4 heat exchange, and returns from gas returning port 12 To compressor 1, another part cold-producing medium of flash vessel 7 flows out from first interface 71, and through QI invigorating loop 6, and pass through First valve port 81 of three-way valve 8 and the second valve port 82 also return to compressor 1 through the gas supplementing opening 11 of compressor 1；When During T1-T2≤preset value N, three-way valve 8 action the 3rd valve port 83 is connected with the second valve port 82 so that gas supplementing opening 11 and First interface 71 disconnects, and now the cold-producing medium in flash vessel 7 flows out from the second interface 72 and throttles through first throttle element 51 Flowing to outdoor heat exchanger 4 after blood pressure lowering, cold-producing medium flows to cross valve 3 through the second port B after outdoor heat exchanger 4 heat exchange, and Flowing out from cross valve 3 through the 4th port D, now part of refrigerant flows to reservoir 9, and returns to from gas returning port 12 Compressor 1, another part cold-producing medium is through the 3rd valve port 83 of three-way valve 8 and the second valve port 82 and through compressor 1 Gas supplementing opening 11 returns to compressor 1.

Below in conjunction with Fig. 1-Fig. 6 to the structure of the air-conditioner 100 of some embodiments of the invention and the controlling party of air-conditioner 100 thereof Method is described in detail.

Embodiment 1

As shown in Figure 4, air-conditioner 100 is single cold type air-conditioner, and air-conditioner 100 includes the list forming refrigerant circulation loop Cylinder compressor 1, indoor heat exchanger 2, outdoor heat exchanger 4, first throttle element 51, QI invigorating loop 6, reservoir 9, sudden strain of a muscle Steaming device 7 and the dropping valve 61 being connected on QI invigorating loop 6.Single cylinder compressor 1 has air vent 13, gas returning port 12 and mends QI KOU 11, wherein gas returning port 12 and gas supplementing opening 11 are same port.Reservoir 9 and the gas returning port 12 of single cylinder compressor 1 It is connected.

Flash vessel 7 has first interface 71 and is connected to reservoir to the 3rd interface 73, first interface 71 by QI invigorating loop 6 9, thus, the part gaseous refrigerant in flash vessel 7 can be by QI invigorating loop 6 and through reservoir 9 and single cylinder compressor 1 Gas returning port 12 return to single cylinder compressor 1.

Second interface 72 and the 3rd interface 73 respectively with the first end and the first end phase of indoor heat exchanger 2 of outdoor heat exchanger 4 Even, first throttle element 51 is connected between outdoor heat exchanger 4 and the second interface 72.

Second end of outdoor heat exchanger 4 is connected with the air vent 13 of single cylinder compressor 1, the second end of indoor heat exchanger 2 It is connected with the gas returning port 12 of single cylinder compressor 1 by reservoir 9, discharges from the air vent 13 of single cylinder compressor 1 The cold-producing medium of High Temperature High Pressure is through outdoor heat exchanger 4, and carries out heat exchange, heat exchange with outdoor environment in outdoor heat exchanger 4 After cold-producing medium after first throttle element 51 reducing pressure by regulating flow, flow to flash vessel 7, the operative liquid system in flash vessel 7 Cryogen flows to indoor heat exchanger 2 through the 3rd interface 73, and carry out with indoor environment in indoor heat exchanger 2 heat exchange with Giving indoor refrigeration, refrigerant flow direction reservoir 9 after heat exchange the gas returning port 12 through single cylinder compressor 1 return to list Cylinder compressor 1.In the running of air-conditioner 100, obtain temperature T1 and the temperature of flash vessel 7 in QI invigorating loop 6 T2, compares T1 with T2, and when T1-T2 is more than preset value N, another part cold-producing medium of flash vessel 7 passes through QI invigorating loop 6 and the dropping valve 61 being connected on QI invigorating loop 6, and returning through reservoir 9 and single cylinder compressor 1 QI KOU 12 returns to single cylinder compressor 1；As T1-T2≤preset value N, can be by turning the joint of first throttle element 51 down Flow flows through the refrigerant temperature of first throttle element 51 to reduce, thus reduces and flow back to single cylinder compressor by QI invigorating loop 6 The content of the liquid refrigerant in the cold-producing medium of 1, or close dropping valve 61, and make the aperture of first throttle element 51 constant With the connection in cut-off QI invigorating loop 6 with reservoir 9, thus avoid the refrigerant flow direction single cylinder compressor 1 in QI invigorating loop 6, Ensure the reliability of compressor 1 work.

Embodiment 2

As it is shown in figure 5, air-conditioner 100 includes forming the single cylinder compressor 1 of refrigerant circulation loop, indoor heat exchanger 2, room External heat exchanger 4, first throttle element 51, QI invigorating loop 6, cross valve 3, reservoir 9, flash vessel 7 and be connected on QI invigorating Dropping valve 61 on loop 6.Single cylinder compressor 1 has air vent 13, gas returning port 12 and gas supplementing opening 11, wherein gas returning port 12 and gas supplementing opening 11 be same port.Reservoir 9 is connected with the gas returning port 12 of single cylinder compressor 1.

Cross valve 3 includes the first port A to the 4th port D, wherein, the first port A and the second port B and the 3rd port One of them connection in C, another connection in the 4th port D and the second port B and the 3rd port C, the first port A is connected with air vent 13, and the 4th port D is connected with gas returning port 12 by reservoir 9.Second end of outdoor heat exchanger 4 Being connected with the second port B, the second end of indoor heat exchanger 2 and the 3rd port C are connected, thus cross valve 3 is connected to system So that the circulation of cold-producing medium in refrigerant cycle loop.

When air-conditioner 100 freezes, the first port A and the second port B connection, the 3rd port C and the 4th port D connection, The cold-producing medium of the High Temperature High Pressure that the air vent 13 of single cylinder compressor 1 is discharged flows to room through the first port A and the second port B External heat exchanger 4, and carry out heat exchange with outdoor environment in outdoor heat exchanger 4, the cold-producing medium after heat exchange is through first throttle unit Flash vessel 7 is flowed to after part 51 reducing pressure by regulating flow.Some liquid refrigerant in flash vessel 7 flows to room through the 3rd interface 73 Interior heat exchanger 2, and in indoor heat exchanger 2, carry out heat exchange with indoor environment with to indoor refrigeration, cold-producing medium passes through subsequently 3rd port C and the 4th port D flows to reservoir 9, and returns to compressor 1 through the gas returning port 12 of compressor 1； In the running of air-conditioner 100, obtain temperature T1 in QI invigorating loop 6 and temperature T2 of flash vessel 7, by T1 with T2 compares, and when T1-T2 is more than preset value N, another part cold-producing medium of flash vessel 7 is through QI invigorating loop 6 Reservoir 9 is flowed to the dropping valve 61 being connected on QI invigorating loop 6, and through the gas returning port 12 of single cylinder compressor 1 Return to single cylinder compressor 1；As T1-T2≤preset value N, the aperture of dropping valve 61 keeps constant and turns first throttle down The amount of restriction of element 51, thus the liquid refrigerant in reducing the cold-producing medium being flow back to single cylinder compressor 1 by QI invigorating loop 6 Content, or can also be by closing dropping valve 61, the aperture making first throttle element 51 is constant to end QI invigorating loop 6 With the connection of gas supplementing opening 11, thus avoid the refrigerant flow direction single cylinder compressor 1 containing liquid refrigerant in QI invigorating loop 6, Improve reliability when single cylinder compressor 1 works.

When air-conditioner 100 heats, the first port A and the 3rd port C connection, the second port B and the 4th port D connection, Flow to through the first port A and the 3rd port C from the cold-producing medium of the High Temperature High Pressure of air vent 13 discharge of single cylinder compressor 1 Indoor heat exchanger 2, and carry out heat exchange with indoor environment in indoor heat exchanger 2, the cold-producing medium after heat exchange is through the 3rd interface 73 flow to flash vessel 7.Some refrigerant in flash vessel 7 flows out from the second interface 72, and through first throttle element 51 Flowing to outdoor heat exchanger 4 after reducing pressure by regulating flow, cold-producing medium carries out heat exchange, after heat exchange with outdoor environment in outdoor heat exchanger 4 Cold-producing medium flows to reservoir 9 through the second port B and the 4th port D, and returns through the gas returning port 12 of single cylinder compressor 1 To single cylinder compressor 1；In the running of air-conditioner 100, obtain temperature T1 and the temperature of flash vessel 7 in QI invigorating loop 6 Degree T2, T1 with T2 is compared, when T1-T2 be more than preset value N time, another part cold-producing medium of flash vessel 7 from First interface 71 flows out, and flows to reservoir 9 through QI invigorating loop 6 and the dropping valve 61 being connected on QI invigorating loop 6, And return to single cylinder compressor 1 through the gas returning port 12 of single cylinder compressor 1；As T1-T2≤preset value N, dropping valve The aperture of 61 keeps amount of restriction that is constant and that increase first throttle element 51, thus reduces and flow back to single cylinder by QI invigorating loop 6 The content of the liquid refrigerant in the cold-producing medium of compressor 1 or first throttle element can also be made by closing dropping valve 61 The aperture of 51 is constant with cut-off QI invigorating loop 6 and the connection of gas supplementing opening 11, thus avoids the cold-producing medium in QI invigorating loop 6 to lead to Cross gas supplementing opening 11 and flow to single cylinder compressor 1, improve reliability when single cylinder compressor 1 works.

Embodiment 3

As shown in Figure 6, compared with Example 2, the air-conditioner 100 in the present embodiment is at indoor heat exchanger 2 and the 3rd interface Being provided with second section fluid element 52 between 73, other structure of air-conditioner 100 is the most identical with embodiment 2, the most detailed Thin description.

When air-conditioner 100 freezes, the first port A and the second port B connection, the 3rd port C and the 4th port D connection, The cold-producing medium of the High Temperature High Pressure that the air vent 13 of single cylinder compressor 1 is discharged flows to room through the first port A and the second port B External heat exchanger 4, and carry out heat exchange with outdoor environment in outdoor heat exchanger 4, the cold-producing medium after heat exchange is through first throttle unit Flash vessel 7 is flowed to after part 51 reducing pressure by regulating flow.Some liquid refrigerant in flash vessel 7 flows out and warp from the 3rd interface 73 After crossing second section fluid element 52 reducing pressure by regulating flow, flow to indoor heat exchanger 2, and in indoor heat exchanger 2 and indoor environment Carrying out heat exchange with to indoor refrigeration, cold-producing medium flows to reservoir 9 through the 3rd port C and the 4th port D subsequently, and Gas returning port 12 through single cylinder compressor 1 returns to single cylinder compressor 1；In the running of air-conditioner 100, obtain Take temperature T1 and temperature T2 of flash vessel 7 in QI invigorating loop 6, T1 with T2 is compared, when T1-T2 is more than presetting During value N, another part cold-producing medium of flash vessel 7 is through QI invigorating loop 6 and the dropping valve being connected on QI invigorating loop 6 61 flow to reservoir 9, and return to single cylinder compressor 1 through the gas returning port 12 of single cylinder compressor 1；As T1-T2≤pre- If during value N, the aperture of dropping valve 61 and the aperture of second section fluid element 52 is made to keep constant and turn first throttle element 51 down Amount of restriction, thus the content of the liquid refrigerant in reducing the cold-producing medium being flow back to single cylinder compressor 1 by QI invigorating loop 6, Or dropping valve 61 can also be closed so that the aperture of first throttle element 51 and second section fluid element 52 is constant to end benefit Air circuit 6 and the connection of gas supplementing opening 11, thus avoid the refrigerant flow direction single cylinder compressor 1 in QI invigorating loop 6, improve single Reliability when cylinder compressor 1 works, or make the aperture of dropping valve 61 and the aperture of first throttle element 51 keep constant And increase the amount of restriction of second section fluid element 52 to reduce the liquid in the cold-producing medium being flow back to single cylinder compressor 1 by QI invigorating loop 6 The content of state cold-producing medium.

When air-conditioner 100 heats, the first port A and the 3rd port C connection, the second port B and the 4th port D connection, Flow to through the first port A and the 3rd port C from the cold-producing medium of the High Temperature High Pressure of air vent 13 discharge of single cylinder compressor 1 Indoor heat exchanger 2, and carry out heat exchange with indoor environment in indoor heat exchanger 2, the refrigerant flow direction after heat exchange second throttles Element 52, after second section fluid element 52 reducing pressure by regulating flow, flows to flash vessel 7 by the 3rd interface 73.In flash vessel 7 Some refrigerant flows out from the second interface 72, and flows to outdoor heat exchanger 4 after first throttle element 51 reducing pressure by regulating flow, Cold-producing medium carries out heat exchange with outdoor environment in outdoor heat exchanger 4, and the cold-producing medium after heat exchange is through the second port B and the 4th end Mouthful D flows to reservoir 9, and returns to single cylinder compressor 1 through the gas returning port 12 of single cylinder compressor 1；At air-conditioner 100 Running in, obtain temperature T1 in QI invigorating loop 6 and temperature T2 of flash vessel 7, T1 with T2 compared, When T1-T2 is more than preset value N, another part cold-producing medium of flash vessel 7 is through QI invigorating loop 6 and is connected on QI invigorating and returns Dropping valve 61 on road 6 flows to reservoir 9, and returns to single cylinder compressor through the gas returning port 12 of single cylinder compressor 1 1；As T1-T2≤preset value N, the aperture of dropping valve 61 and the aperture of second section fluid element 52 is made to keep constant and tune up The amount of restriction of first throttle element 51, thus the liquid in reducing the cold-producing medium being flow back to single cylinder compressor 1 by QI invigorating loop 6 The content of cold-producing medium, or dropping valve 61 can also be closed so that opening of first throttle element 51 and second section fluid element 52 Spend the constant connection with cut-off QI invigorating loop 6 with gas supplementing opening 11, thus avoid the refrigerant flow direction single cylinder pressure in QI invigorating loop 6 Contracting machine 1, improves reliability when single cylinder compressor 1 works, or can also make aperture and the first throttle unit of dropping valve 61 The aperture of part 51 keeps amount of restriction that is constant and that turn second section fluid element 52 down, thus reduces and flow back to list by QI invigorating loop 6 The content of the liquid refrigerant in the cold-producing medium of cylinder compressor 1.

Embodiment 4

As it is shown in figure 1, air-conditioner 100 is single cold type air-conditioner, air-conditioner 100 includes forming the double of refrigerant circulation loop Cylinder compressor 1, indoor heat exchanger 2, outdoor heat exchanger 4, first throttle element 51, QI invigorating loop 6, reservoir 9 and Flash vessel 7.Duplex cylinder compressor 1 has air vent 13, gas returning port 12 and gas supplementing opening 11, and gas returning port 12 is located at twin-tub compression On one of them cylinder of machine 1, gas supplementing opening 11 is located on another cylinder.Reservoir 9 and the gas supplementing opening of duplex cylinder compressor 1 11 are connected.

Flash vessel 7 has first interface 71 and is connected to reservoir to the 3rd interface 73, first interface 71 by QI invigorating loop 6 9, thus, the part gaseous refrigerant in flash vessel 7 can be by QI invigorating loop 6 and through reservoir 9 and duplex cylinder compressor 1 Gas supplementing opening 11 return to duplex cylinder compressor 1.

Second end of outdoor heat exchanger 4 is connected with the air vent 13 of duplex cylinder compressor 1, the second end of indoor heat exchanger 2 It is connected with the gas returning port 12 of duplex cylinder compressor 1, from the system of the High Temperature High Pressure that the air vent 13 of duplex cylinder compressor 1 is discharged Cryogen is through outdoor heat exchanger 4, and carries out heat exchange at outdoor heat exchanger 4 and outdoor environment, and the cold-producing medium after heat exchange passes through Flowing to flash vessel 7 after first throttle element 51 reducing pressure by regulating flow, the some liquid refrigerant in flash vessel 7 connects through the 3rd Mouth 73 flows to indoor heat exchanger 2, and carries out heat exchange in indoor heat exchanger 2 with indoor environment to indoor refrigeration, to change Cold-producing medium after heat returns to duplex cylinder compressor 1 through the gas returning port 12 of duplex cylinder compressor 1.Fortune at air-conditioner 100 During row, obtain temperature T1 and temperature T2 of flash vessel 7 in QI invigorating loop 6, T1 with T2 is compared, when When T1-T2 is more than preset value N, another part cold-producing medium of flash vessel 7 is through QI invigorating loop 6 and through reservoir 9 He The gas supplementing opening 11 of compressor 1 returns to duplex cylinder compressor 1；As T1-T2≤preset value N, can be by turning first segment down The amount of restriction of fluid element 51 flows through the refrigerant temperature of first throttle element 51 to reduce, thus reduces by QI invigorating loop 6 Flow back to the content of liquid refrigerant in the cold-producing medium of compressor 1, improve reliability when compressor 1 works.

Embodiment 5

As in figure 2 it is shown, air-conditioner 100 includes forming the duplex cylinder compressor 1 of refrigerant circulation loop, indoor heat exchanger 2, room External heat exchanger 4, first throttle element 51, second section fluid element 52, QI invigorating loop 6, cross valve 3, reservoir 9 and sudden strain of a muscle Steaming device 7.Duplex cylinder compressor 1 has air vent 13, gas returning port 12 and gas supplementing opening 11, and gas returning port 12 is located at duplex cylinder compressor On one of them cylinder of 1, gas supplementing opening 11 is located on another cylinder.Reservoir 9 and the gas returning port 12 of duplex cylinder compressor 1 It is connected.

Flash vessel 7 has first interface 71 and is connected to gas supplementing opening to the 3rd interface 73, first interface 71 by QI invigorating loop 6 11, thus, the part gaseous refrigerant in flash vessel 7 by QI invigorating loop 6 and can return to twin-tub pressure through gas supplementing opening 11 Contracting machine 1.

Second interface 72 and the 3rd interface 73 respectively with the first end and the first end phase of indoor heat exchanger 2 of outdoor heat exchanger 4 Even, first throttle element 51 is connected between outdoor heat exchanger 4 and the second interface 72, and second section fluid element 52 is connected on room Between interior heat exchanger 2 and the 3rd interface 73.

Cross valve 3 includes the first port A to the 4th port D, wherein, the first port A and the second port B and the 3rd port One of them connection in C, another connection in the 4th port D and the second port B and the 3rd port C, the first port A is connected with air vent 13, and the 4th port D is connected with gas returning port 12 by reservoir 9.Second end of outdoor heat exchanger 4 Being connected with the second port B, the second end of indoor heat exchanger 2 and the 3rd port C are connected.

When air-conditioner 100 freezes, the first port A and the second port B connection, the 3rd port C and the 4th port D connection, The cold-producing medium of the High Temperature High Pressure that the air vent 13 of duplex cylinder compressor 1 is discharged flows to room through the first port A and the second port B External heat exchanger 4, and carry out heat exchange with outdoor environment in outdoor heat exchanger 4, the cold-producing medium after heat exchange is through first throttle unit Flash vessel 7 is flowed to after part 51 reducing pressure by regulating flow.A part of liquid refrigerant in flash vessel 7 flows out also from the 3rd interface 73 After second section fluid element 52 reducing pressure by regulating flow, flow to indoor heat exchanger 2, and in indoor heat exchanger 2 with indoor ring Border carries out heat exchange with to indoor refrigeration, and cold-producing medium flows to reservoir 9 through the 3rd port C and the 4th port D subsequently, And return to duplex cylinder compressor 1 through the gas returning port 12 of duplex cylinder compressor 1；In the running of air-conditioner 100, Obtain temperature T1 and temperature T2 of flash vessel 7 in QI invigorating loop 6, T1 with T2 is compared, when T1-T2 is more than pre- If during value N, another part cold-producing medium in flash vessel 7 is through QI invigorating loop 6 and through the QI invigorating of duplex cylinder compressor 1 Mouth 11 returns to duplex cylinder compressor 1；As T1-T2≤preset value N, the aperture of second section fluid element 52 keep constant and Turn the amount of restriction of first throttle element 51 down, or make the aperture of first throttle element 51 keep constant and increase the second throttling The amount of restriction of element 52, thus the liquid refrigerant in reducing the cold-producing medium being flow back to duplex cylinder compressor 1 by QI invigorating loop 6 Content, improves reliability when duplex cylinder compressor 1 works.

When air-conditioner 100 heats, the first port A and the 3rd port C connection, the second port B and the 4th port D connection, Flow to through the first port A and the 3rd port C from the cold-producing medium of the High Temperature High Pressure of air vent 13 discharge of duplex cylinder compressor 1 Indoor heat exchanger 2, and carry out heat exchange with indoor environment in indoor heat exchanger 2, the refrigerant flow direction after heat exchange second throttles Element 52, after second section fluid element 52 reducing pressure by regulating flow, flows to flash vessel 7 by the 3rd interface 73.In flash vessel 7 Some refrigerant flows out from the second interface 72, and flows to outdoor heat exchanger 4 after first throttle element 51 reducing pressure by regulating flow, Cold-producing medium carries out heat exchange with outdoor environment in outdoor heat exchanger 4, and the cold-producing medium after heat exchange is through the second port B and the 4th end Mouthful D flows to reservoir 9, and returns to duplex cylinder compressor 1 through the gas returning port 12 of duplex cylinder compressor 1；At air-conditioner 100 Running in, obtain temperature T1 in QI invigorating loop 6 and temperature T2 of flash vessel 7, T1 with T2 compared, When T1-T2 is more than preset value N, another part cold-producing medium of flash vessel 7 compresses through QI invigorating loop 6 and through twin-tub The gas supplementing opening 11 of machine 1 returns to duplex cylinder compressor 1；As T1-T2≤preset value N, the aperture of second section fluid element 52 Keep amount of restriction that is constant and that tune up first throttle element 51, or make the aperture of first throttle element 51 keep constant and adjust The amount of restriction of little second section fluid element 52, thus the liquid in reducing the cold-producing medium being flow back to duplex cylinder compressor 1 by QI invigorating loop 6 The content of state cold-producing medium.

Embodiment 6

As it is shown on figure 3, compared with Example 5, the air-conditioner 100 in the present embodiment also includes being located on QI invigorating loop 6 Three-way valve 8, three-way valve 8 includes that the first valve port 81 to the 3rd valve port 83, the first valve port 81 are connected with first interface 71, the Two valve ports 82 are connected with gas supplementing opening 11, and the 3rd valve port 83 is connected with the reservoir 9 of compressor 1 by connecting tube 84.The Two valve ports 82 connect with one of them in the first valve port 81 and the 3rd valve port 83.4th port D of cross valve 3 connects To above-mentioned connecting tube 84 to connect with reservoir 9.Other structure of air-conditioner 100 is identical with embodiment 5, the most not Describe in detail again.

When air-conditioner 100 freezes, the first port A and the second port B connection, the 3rd port C and the 4th port D connection, The cold-producing medium of the High Temperature High Pressure that the air vent 13 of compressor 1 is discharged flows to outdoor change through the first port A and the second port B Hot device 4, and carry out heat exchange with outdoor environment in outdoor heat exchanger 4, the cold-producing medium after heat exchange is through first throttle element Flash vessel 7 is flowed to after 51 reducing pressure by regulating flows.In the running of air-conditioner 100, obtain QI invigorating loop 6 temperature T1 and Temperature T2 of flash vessel 7, compares T1 with T2, and as T1-T2 ＞ preset value N, three-way valve 8 action makes One valve port 81 connects with the second valve port 82 so that gas supplementing opening 11 and first interface 71 connect, now in flash vessel 7 Point cold-producing medium flows out from the 3rd interface 73, after second section fluid element 52 reducing pressure by regulating flow and flow to indoor heat exchanger 2, and refrigeration Agent flows to cross valve 3 through the 3rd port C after indoor heat exchanger 2 heat exchange, and cold-producing medium flows out also from the 4th port D subsequently Flowing to reservoir 9, and return to compressor 1 from gas returning port 12, another part cold-producing medium of flash vessel 7 is from first interface 71 Flow out, and through QI invigorating loop 6, and through the first valve port 81 of three-way valve 8 and the second valve port 82 and through compressor 1 Gas supplementing opening 11 return to compressor 1；As T1-T2≤preset value N, three-way valve 8 action makes the 3rd valve port 83 and Two valve ports 82 connect so that gas supplementing opening 11 and first interface 71 disconnect, and now the cold-producing medium in flash vessel 7 is from the 3rd interface 73 flow out, and after second section fluid element 52 reducing pressure by regulating flow and flow to indoor heat exchanger 2, cold-producing medium is in indoor heat exchanger 2 heat exchange After flow to cross valve 3 through the 3rd port C, and flow out from cross valve 3 through the 4th port D, now part of refrigerant Flowing to reservoir 9, and return to compressor 1 from gas returning port 12, another part cold-producing medium is through the 3rd valve port of three-way valve 8 83 and second valve port 82 return to compressor 1 through the gas supplementing opening 11 of compressor 1.

When air-conditioner 100 heats, the first port A and the 3rd port C connection, the second port B and the 4th port D connection, Indoor are flowed to through the first port A and the 3rd port C from the cold-producing medium of the High Temperature High Pressure of air vent 13 discharge of compressor 1 Heat exchanger 2, and carry out heat exchange with indoor environment in indoor heat exchanger 2, the cold-producing medium after heat exchange is through second section fluid element 52 After reducing pressure by regulating flow, flow to flash vessel 7 through the 3rd interface 73.In the running of air-conditioner 100, obtain QI invigorating loop Temperature T1 of 6 and temperature T2 of flash vessel 7, compare T1 with T2, as T1-T2 ＞ preset value N, and threeway Valve 8 action makes the first valve port 81 connect with the second valve port 82 so that gas supplementing opening 11 and first interface 71 connect, and now dodges Some refrigerant in steaming device 7 flows out from the second interface 72 and flows to outdoor after first throttle element 51 reducing pressure by regulating flow and changes Hot device 4, cold-producing medium flows to reservoir 9 through the second port B and the 4th port D after outdoor heat exchanger 4 heat exchange, and from Gas returning port 12 returns to compressor 1, and another part cold-producing medium of flash vessel 7 flows out from first interface 71, and through QI invigorating Loop 6, and return to through the first valve port 81 of three-way valve 8 and the second valve port 82 and through the gas supplementing opening 11 of compressor 1 Compressor 1；As T1-T2≤preset value N, three-way valve 8 action the 3rd valve port 83 is connected with the second valve port 82 so that Gas supplementing opening 11 and first interface 71 disconnect, and now the cold-producing medium in flash vessel 7 flows out and through first throttle from the second interface 72 Flowing to outdoor heat exchanger 4 after element 51 reducing pressure by regulating flow, cold-producing medium flows to through the second port B after outdoor heat exchanger 4 heat exchange Cross valve 3, and flow out from cross valve 3 through the 4th port D, now part of refrigerant flows to reservoir 9, and from returning QI KOU 12 returns to compressor 1, and another part cold-producing medium is through the 3rd valve port 83 and the second valve port 82 warp of three-way valve 8 The gas supplementing opening 11 of overcompression machine 1 returns to compressor 1.

In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " concrete example ", Or specific features, structure, material or the feature bag that the description of " some examples " etc. means to combine this embodiment or example describes It is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term necessarily It is directed to identical embodiment or example.And, the specific features of description, structure, material or feature can be arbitrary Individual or multiple embodiment or example combine in an appropriate manner.Additionally, in the case of the most conflicting, the skill of this area The feature of the different embodiments described in this specification or example and different embodiment or example can be combined by art personnel And combination.

Although above it has been shown and described that embodiments of the invention, it is to be understood that above-described embodiment is exemplary, Being not considered as limiting the invention, those of ordinary skill in the art within the scope of the invention can be to above-described embodiment It is changed, revises, replaces and modification.

Claims

1. the control method of an air-conditioner, it is characterised in that described air-conditioner includes the compression forming refrigerant circulation loop Machine, indoor heat exchanger, outdoor heat exchanger, throttling arrangement, QI invigorating loop and flash vessel, described flash vessel has first interface To the 3rd interface, described first interface is connected to the gas supplementing opening of described compressor, described second interface by described QI invigorating loop It is connected with the first end of described outdoor heat exchanger and the first end of described indoor heat exchanger respectively with described 3rd interface, described joint Stream device includes the first throttle element being connected between described outdoor heat exchanger and described second interface, described control method bag Include following steps:

S1: obtain temperature T1 and temperature T2 of described flash vessel in described QI invigorating loop, described T1 is carried out with described T2 Relatively；

S2: if described T1-T2 ＞ preset value N, described air-conditioner keeps former control model to run；If described T1-T2≤preset Value N, reduction flows back to the content of the liquid refrigerant in the cold-producing medium of described compressor by described QI invigorating loop.

The control method of air-conditioner the most according to claim 1, it is characterised in that in described step S2, when T1-T2≤ During preset value N, at least one in following action can be performed: adjust the aperture of described throttling arrangement, adjust outdoor fan Rotating speed, adjust the rotating speed of indoor fan, end the connection of described QI invigorating loop and described gas supplementing opening.

The control method of air-conditioner the most according to claim 1 and 2, it is characterised in that described compressor is single cylinder pressure Contracting machine, described QI invigorating loop is in series with dropping valve, and described air-conditioner is single cold type air-conditioner.

The control method of air-conditioner the most according to claim 3, it is characterised in that in step s 2, when T1-T2≤ During preset value N, turn the amount of restriction of described first throttle element down.

The control method of air-conditioner the most according to claim 3, it is characterised in that in step s 2, when T1-T2≤ During preset value N, closing described dropping valve, the aperture of described first throttle element is constant.

The control method of air-conditioner the most according to claim 1 and 2, it is characterised in that described compressor is single cylinder pressure Contracting machine, described QI invigorating loop is in series with dropping valve, and described air-conditioner also includes being located in chiller refrigeration agent closed circuit Cross valve.

The control method of air-conditioner the most according to claim 6, it is characterised in that in step s 2, when T1-T2≤ During preset value N, when refrigeration mode, the aperture of described dropping valve keeps amount of restriction that is constant and that turn described first throttle element down, When heating mode, the aperture of described dropping valve keeps amount of restriction that is constant and that increase described first throttle element.

The control method of air-conditioner the most according to claim 6, it is characterised in that in step s 2, when T1-T2≤ During preset value N, closing described dropping valve when refrigeration mode and heating mode, the aperture of described first throttle element is constant.

The control method of air-conditioner the most according to claim 6, it is characterised in that described throttling arrangement also includes series connection Second section fluid element in described 3rd interface and described indoor heat exchanger.

The control method of air-conditioner the most according to claim 9, it is characterised in that in step s 2, when T1-T2≤ During preset value N, when refrigeration mode, the aperture of described dropping valve and the aperture of described second section fluid element keep constant and turn down The amount of restriction of described first throttle element, the aperture of described dropping valve and the aperture of described second section fluid element when heating mode Keep amount of restriction that is constant and that tune up described first throttle element.

The control method of 11. air-conditioners according to claim 9, it is characterised in that in step s 2, when T1-T2≤ During preset value N, close described dropping valve, described first throttle element and described second section when refrigeration mode and heating mode The aperture of fluid element is constant.

The control method of 12. air-conditioners according to claim 9, it is characterised in that in step s 2, when T1-T2≤ During preset value N, when refrigeration mode, the aperture of described dropping valve and the aperture of described first throttle element keep constant and increase The amount of restriction of described second section fluid element, the aperture of described dropping valve and the aperture of described first throttle element when heating mode Keep amount of restriction that is constant and that turn described second section fluid element down.

The control method of 13. air-conditioners according to claim 1 and 2, it is characterised in that described compressor is multi-cylinder Compressor, described air-conditioner is single cold type air-conditioner.

The control method of 14. air-conditioners according to claim 13, it is characterised in that in step s 2, when T1-T2≤ During preset value N, turn the amount of restriction of described first throttle element down.

The control method of 15. air-conditioners according to claim 1 and 2, it is characterised in that described compressor is multi-cylinder Compressor, described air-conditioner also includes the cross valve being located in refrigerant circulation loop.

The control method of 16. air-conditioners according to claim 15, it is characterised in that in step s 2, when T1-T2≤ During preset value N, turn the amount of restriction of described first throttle element down when refrigeration mode, increase described first when heating mode The amount of restriction of restricting element.

The control method of 17. air-conditioners according to claim 15, it is characterised in that described throttling arrangement also includes string It is associated in the second section fluid element in described 3rd interface and described indoor heat exchanger.

The control method of 18. air-conditioners according to claim 17, it is characterised in that in step s 2, when T1-T2≤ During preset value N, when refrigeration mode, the aperture of described second section fluid element keeps constant and turns described first throttle element down Amount of restriction, when heating mode, the aperture of described second section fluid element keeps throttling that is constant and that tune up described first throttle element Amount.

The control method of 19. air-conditioners according to claim 17, it is characterised in that in step s 2, when T1-T2≤ During preset value N, when refrigeration mode, the aperture of described first throttle element keeps constant and increases described second section fluid element Amount of restriction, when heating mode, the aperture of described first throttle element keeps throttling that is constant and that turn described second section fluid element down Amount.

The control method of 20. air-conditioners according to claim 1 and 2, it is characterised in that set on described QI invigorating loop The first valve port to the 3rd valve port, described first valve port are connected with described first interface to have three-way valve, described three-way valve to include, institute Stating the second valve port to be connected with described gas supplementing opening, described 3rd valve port is connected with the reservoir of described compressor, described second valve port Connect with one of them in described first valve port and described 3rd valve port, when described T1-T2 ＞ preset value N, described three Logical valve events makes the second valve port connect with described first valve port；If described T1-T2≤preset value N, described three-way valve action makes Obtain described second valve port to connect with described 3rd end valve mouth.