CN103635754A

CN103635754A - Air conditioner

Info

Publication number: CN103635754A
Application number: CN201280032321.9A
Authority: CN
Inventors: 道明伸夫; 栗原利行; 森本康介
Original assignee: Daikin Industries Ltd
Current assignee: Daikin Industries Ltd
Priority date: 2011-06-28
Filing date: 2012-05-31
Publication date: 2014-03-12
Also published as: EP2741021A4; WO2013001976A1; KR20140026630A; JP2013011364A; EP2741021A1; US20140116078A1

Abstract

An air conditioner (1) is provided with a flow path mechanism (26) used for defrosting. The air conditioner (1) performs a heating-defrost operation whereby the refrigerant transmitted from an indoor heat exchanger (41) to an outdoor heat exchanger (23) is evaporated while a given heat exchange path is defrosted by means of the defrosting flow path mechanism (26). In the heating-defrost operation, first, by means of the defrosting flow path mechanism (26), the refrigerant transmitted from the indoor heat exchanger (41) to the outdoor heat exchanger (23) is circulated in a given heat exchange path from the gas-side end toward the liquid-side end of the given heat exchange path, without being introduced into a refrigerant flow divider (64). Next, the refrigerant that has passed through the given heat exchange path is passed through the refrigerant flow divider (64) and is circulated from the liquid-side end to the gas-side end in another heat exchange path other than the given heat exchange path.

Description

Aircondition

Technical field

The present invention relates to aircondition, relate in particular to the aircondition that can heat running.

Background technology

At present, have a kind of aircondition, it forms by connecting successively compressor, indoor heat converter, outdoor heat converter, and can make the running that heats that cold-producing medium circulates successively in compressor, indoor heat converter, outdoor heat converter, compressor.In this aircondition, on outdoor heat converter, produce frost in the situation that, utilizing four-way switching valve etc. to carry out carrying out so that the mode that cold-producing medium circulates successively in compressor, outdoor heat converter, indoor heat converter, compressor is switched the reverse cycle defrosting running of the defrosting of outdoor heat converter.Therefore,, in this aircondition, in reverse cycle defrosting running, make to heat running and stop, thereby diminish indoor comfortableness.

For improve this heat operating in defrosting running stop such situation, propose the aircondition shown in patent documentation 1 (Japanese Patent Laid-Open 2000-274780 communique) and patent documentation 2 (Japanese Patent Laid-Open 2001-059994 communique), usingd the Defrost mode that turns round and carry out the defrosting of outdoor heat converter as continuing to heat.

In the aircondition of patent documentation 1, at the liquid side of a plurality of heat exchange paths of outdoor heat converter, magnetic valve is set respectively.In addition,, in this aircondition, the in the situation that of producing frost on outdoor heat converter, carry out making the mobile running that stop of cold-producing medium in this heat exchange paths by closing the magnetic valve of the heat exchange paths of selecting arbitrarily.According to this running, in this aircondition, can utilize the heat of outdoor air to carry out the defrosting of any heat exchange paths, and can continue to heat running by making cold-producing medium evaporate in other heat exchange paths.

In the aircondition of patent documentation 2, bypass is set, this bypass is used for a part for the cold-producing medium of discharging from compressor to be delivered to the liquid side of a plurality of heat exchange paths of outdoor heat converter, and is not delivered to indoor heat converter.In addition, in this aircondition, the in the situation that of producing frost on outdoor heat converter, carry out following running: via bypass, a part for the cold-producing medium of discharging from compressor is delivered to any heat exchange paths of outdoor heat converter, and is not delivered to indoor heat converter.According to this running, in this aircondition, can utilize the heat of the cold-producing medium that is delivered to any heat exchange paths via bypass to carry out the defrosting of any heat exchange paths, and by making cold-producing medium evaporate and continue to heat running in other heat exchangers.

Summary of the invention

Yet, in the Defrost mode of above-mentioned patent documentation 1, if being 0 ℃, the temperature of outdoor air can not melt with next frost (ice), therefore, the extraneous gas temperature that heats more greatly load at needs is under the meteorological condition below 0 ℃, and existence can not be to outdoor heat converter such problem that defrosts.In addition, utilize with white temperature between the less outdoor air of temperature difference frost is melted, therefore, defrost very time-consuming, consequently, the time that only heats running, the such problem of heating capacity that can not improve integration have been shortened in existence.

In addition, in the Defrost mode of above-mentioned patent documentation 2, will be delivered to indoor heat converter and the defrosting for outdoor heat converter for the part of the cold-producing medium that heats, therefore, have the very low such problem of heating capacity in defrosting.

Technical problem of the present invention is, in heating the aircondition of running, to reduce hardly heating capacity, just can carry out the defrosting of outdoor heat converter.

The aircondition of the first technical scheme is by connecting compressor, indoor heat converter, outdoor heat converter to form successively, wherein, above-mentioned compressor is compressed cold-producing medium, above-mentioned indoor heat converter dispels the heat to the cold-producing medium after compressed in compressor, and above-mentioned outdoor heat converter evaporates the cold-producing medium after heat radiation in indoor heat converter by carrying out heat exchange with outdoor air.This aircondition can make the running that heats that cold-producing medium circulates successively in compressor, indoor heat converter, outdoor heat converter, compressor.Outdoor heat converter has a plurality of heat exchange paths that connect side by side each other.The liquid side of a plurality of heat exchange paths utilizes coolant flow divider to be tied together, and this coolant flow divider is for being branched off into the cold-producing medium that is delivered to outdoor heat converter from indoor heat converter the liquid side of a plurality of heat exchanger passages.In addition, in this aircondition, take said structure as prerequisite, also be provided with defrosting stream mechanism, this defrosting stream mechanism for being delivered to the cold-producing medium that is delivered to outdoor heat converter from indoor heat converter the gas side of any heat exchange paths of selecting from a plurality of heat exchange paths not flowing into coolant flow divider.In addition, in this aircondition, utilize defrosting stream mechanism to carry out following heating and defrosting running: any heat exchange paths to be defrosted, Yi Bian make to be delivered to from indoor heat converter the cold-producing medium evaporation of outdoor heat converter on one side.First this heating and defrosting running utilizes defrosting stream mechanism to make the cold-producing medium that is delivered to outdoor heat converter from indoor heat converter not flow into coolant flow divider, and is flow through in any heat exchange paths towards liquid side by the gas side of any heat exchange paths.Then the cold-producing medium that, makes to flow through any heat exchange paths flows through in other heat exchange paths from the liquid side vigor side end of other heat exchange paths except any heat exchange paths via coolant flow divider.

In this aircondition, by used successively the heating and defrosting of defrosting stream mechanism to turn round to a plurality of heat exchange paths, can carry out the defrosting of outdoor heat converter integral body.In addition, in this heating and defrosting running, whole flows of the cold-producing medium after compressed in compressor can be delivered to indoor heat converter for heating, then, the heat that utilization is delivered to the cold-producing medium of outdoor heat converter from indoor heat converter defrosts.By this, reduce hardly heating capacity, just can obtain higher defrosting ability, in addition, externally gas temperature is under 0 ℃ of following meteorological condition, also can carry out the defrosting of outdoor heat converter.

The aircondition of the second technical scheme is on the basis of the aircondition of the first technical scheme, outdoor heat converter also has supercooling path, and the cold-producing medium that is delivered to outdoor heat converter from indoor heat converter flow through this supercooling path before flowing into coolant flow divider.In addition, defrosting stream mechanism is configured to: can, by the cold-producing medium that is delivered to outdoor heat converter from indoor heat converter after flowing through supercooling path, be delivered to the gas side of any heat exchange paths of selecting from a plurality of heat exchange paths.

In this aircondition, also can in heating and defrosting running, make cold-producing medium flow through supercooling path, therefore, can prevent freezing again of drain water that the defrosting because of heat exchange paths produces, and can carry out rapidly draining from the bottom of outdoor heat converter.

The aircondition of the 3rd technical scheme is on the basis of the aircondition of the first technical scheme, outdoor heat converter also has supercooling path, and the cold-producing medium that is delivered to outdoor heat converter from indoor heat converter flow through this supercooling path before flowing into coolant flow divider.In addition, defrosting stream mechanism is configured to: the cold-producing medium that is delivered to outdoor heat converter from indoor heat converter can be delivered to not flowing through supercooling path to the gas side of any heat exchange paths of selecting from a plurality of heat exchange paths.

In this aircondition, in heating and defrosting running, need not make cold-producing medium flow through supercooling path, just can carry out the defrosting of heat exchange paths, therefore, can be by the heat of cold-producing medium only for the defrosting of heat exchange paths.

Accompanying drawing explanation

Fig. 1 is the schematic configuration diagram of the aircondition of first embodiment of the invention.

Fig. 2 is the top view (diagram after top board is removed) of outdoor unit.

Fig. 3 schematically illustrates the outdoor heat converter of the first embodiment and near the figure of structure thereof.

Fig. 4 is the control block diagram of aircondition.

Fig. 5 means the mobile figure that heats the cold-producing medium in aircondition while turning round of the first embodiment.

Fig. 6 is the flow chart of heating and defrosting running.

Fig. 7 means the figure of cold-producing medium in the aircondition of the first embodiment flow (the carrying out the situation of the defrosting of the first heat exchange paths) when heating and defrosting turns round.

Fig. 8 is the pressure-enthalpy line chart of kind of refrigeration cycle that illustrates heating and defrosting when running of the first embodiment.

Fig. 9 is the pressure-enthalpy line chart of kind of refrigeration cycle that illustrates defrosting when running of existing (patent documentation 2).

Figure 10 is the flow chart that the heating and defrosting of the variation 1 of the first embodiment turns round.

Figure 11 is the schematic configuration diagram of aircondition of the variation 2 of the first embodiment, and it means cold-producing medium in the aircondition mobile figure when heating running.

Figure 12 means the figure of cold-producing medium in the aircondition of variation 2 of the first embodiment flow (the carrying out the situation of the defrosting of the first heat exchange paths) when heating and defrosting turns round.

Figure 13 is the schematic configuration diagram of aircondition of the variation 3 of the first embodiment, and it means cold-producing medium in the aircondition mobile figure when heating running.

Figure 14 means the figure of cold-producing medium in the aircondition of variation 3 of the first embodiment flow (the carrying out the situation of the defrosting of the first heat exchange paths) when heating and defrosting turns round.

Figure 15 is the schematic configuration diagram of aircondition of the variation 4 of the first embodiment, and it means cold-producing medium in the aircondition mobile figure when heating running.

Figure 16 means the figure of cold-producing medium in the aircondition of variation 4 of the first embodiment flow (the carrying out the situation of the defrosting of the first heat exchange paths) when heating and defrosting turns round.

Figure 17 is the schematic configuration diagram of aircondition of the variation 5 of the first embodiment, and it means cold-producing medium in the aircondition mobile figure when heating running.

Figure 18 means the figure of cold-producing medium in the aircondition of variation 5 of the first embodiment flow (the carrying out the situation of the defrosting of the first heat exchange paths) when heating and defrosting turns round.

Figure 19 is the schematic configuration diagram of aircondition of the variation 6 of the first embodiment, and it means cold-producing medium in the aircondition mobile figure when heating running.

Figure 20 means the figure of cold-producing medium in the aircondition of variation 6 of the first embodiment flow (the carrying out the situation of the defrosting of the first heat exchange paths) when heating and defrosting turns round.

Figure 21 is the schematic configuration diagram of the aircondition of second embodiment of the invention.

Figure 22 schematically illustrates the outdoor heat converter of the second embodiment and near the figure of structure thereof.

Figure 23 means the mobile figure that heats the cold-producing medium in aircondition while turning round of the second embodiment.

Figure 24 means the figure of cold-producing medium in the aircondition of the second embodiment flow (the carrying out the situation of the defrosting of the first heat exchange paths) when heating and defrosting turns round.

Figure 25 is the pressure-enthalpy line chart of kind of refrigeration cycle that illustrates heating and defrosting when running of the second embodiment.

Figure 26 is the schematic configuration diagram of aircondition of the variation 2 of the second embodiment, and it means cold-producing medium in the aircondition mobile figure when heating running.

Figure 27 means the figure of cold-producing medium in the aircondition of variation 2 of the second embodiment flow (the carrying out the situation of the defrosting of the first heat exchange paths) when heating and defrosting turns round.

Figure 28 is the schematic configuration diagram of aircondition of the variation 3 of the second embodiment, and it means cold-producing medium in the aircondition mobile figure when heating running.

Figure 29 means the figure of cold-producing medium in the aircondition of variation 3 of the second embodiment flow (the carrying out the situation of the defrosting of the first heat exchange paths) when heating and defrosting turns round.

Figure 30 is the schematic configuration diagram of aircondition of the variation 4 of the second embodiment, and it means cold-producing medium in the aircondition mobile figure when heating running.

Figure 31 means the figure of cold-producing medium in the aircondition of variation 4 of the second embodiment flow (the carrying out the situation of the defrosting of the first heat exchange paths) when heating and defrosting turns round.

Figure 32 is the schematic configuration diagram of aircondition of the variation 5 of the second embodiment, and it means cold-producing medium in the aircondition mobile figure when heating running.

Figure 33 means the figure of cold-producing medium in the aircondition of variation 5 of the 3rd embodiment flow (the carrying out the situation of the defrosting of the first heat exchange paths) when heating and defrosting turns round.

Figure 34 is the schematic configuration diagram of aircondition of the variation 6 of the second embodiment, and it means cold-producing medium in the aircondition mobile figure when heating running.

Figure 35 means the figure of cold-producing medium in the aircondition of variation 6 of the second embodiment flow (the carrying out the situation of the defrosting of the first heat exchange paths) when heating and defrosting turns round.

Figure 36 is the schematic configuration diagram of the aircondition of other embodiments of the present invention.

Figure 37 is the schematic configuration diagram of the aircondition of other embodiments of the present invention.

The specific embodiment

Below, with reference to the accompanying drawings the embodiment of aircondition of the present invention is described.

< the first embodiment >

(overall structure)

Fig. 1 is the schematic configuration diagram of the aircondition 1 of first embodiment of the invention.Aircondition 1 can heat running,, has adopted split type aircondition herein.Aircondition 1 mainly has: outdoor unit 2; Indoor unit 4; And the liquid refrigerant communicating pipe 5 that outdoor unit 2 is connected with indoor unit 4 and gas refrigerant communicating pipe 6.In addition, outdoor unit 2 and indoor unit 4 are configured for carrying out the refrigerant loop 10 of the kind of refrigeration cycle of steam compression type via linking together liquid refrigerant communicating pipe 5 and gas refrigerant communicating pipe 6.

(indoor unit)

Indoor unit 4 is arranged at indoor, has formed a part for refrigerant loop 10.Indoor unit 4 mainly has indoor heat converter 41.

Indoor heat converter 41 is that the evaporimeter as cold-producing medium works with cooling room air when cooling operation, and when heating running, as the radiator of cold-producing medium, works to heat the heat exchanger of room air.As indoor heat converter 41, adopted the finned fin-tube heat exchanger of intersection being formed by heat pipe and a plurality of fin herein.The hydraulic fluid side of indoor heat converter 41 was connected with liquid refrigerant communicating pipe 5, and gas side was connected with gas refrigerant communicating pipe 6.

In addition, indoor unit 4 has

indoor control part

49, and 49 pairs of actions that form the each several part of indoor unit 4 of this indoor control part are controlled.In addition, indoor control part 41 has microcomputer for indoor unit 4 is controlled, memory etc., thereby can between the outdoor control part 29 (aftermentioned) of itself and outdoor unit 2, carry out the exchange of control signal etc.

(outdoor unit)

Outdoor unit 2 is arranged at outdoor, has formed a part for refrigerant loop 10.Outdoor unit 2 mainly has: compressor 21; Four-way switching valve 22; Outdoor heat converter 23; Expansion valve 24; Outdoor fan 25; And defrosting stream mechanism 26.As shown in Figure 2, as outdoor unit 2, adopted the demarcation strip 58 that roughly inside of the unit housings 51 of cuboid box shape is extended in vertical to be divided into the structure (so-called dry linear structure) of supply fan room S1 and Machine Room S2 herein.Herein, Fig. 2 is the top view (diagram after top board is removed) of outdoor unit 2.In addition, outdoor unit 2 mainly contains various device 21～26 etc. in the unit housings 51 of essentially rectangular case shape.

Unit housings 51 mainly has base plate 52, top board, left ahead board 54, right front board 56, right plate 57 and demarcation strip 58.Base plate 52 is horizontal long roughly OBL tabular components of the bottom surface portions of Component units housing 51.Base plate 52 is also as working for receiving the drain pan of the drain water flowing down from outdoor heat converter 23.Top board is not shown in Figure 2, but it is the horizontal long roughly OBL tabular component that forms the summit portion of outdoor unit 2.Left ahead board 54 is tabular components of left front surface portion and the left surface part of main composition unit housings 51.On left ahead board 54, be formed with and utilize outdoor fan 25 by the suction inlet 55a in air intake unit housings 51.In addition, on left ahead board 54, be provided with blow-off outlet 54a, this blow-off outlet 54a for by the Air blowing being absorbed from rear side and the left surface side of unit housings 51 by outdoor fan 25 to outside.Right front board 56 is the right front surface portion of main composition unit housings 51 and the anterior tabular component of right flank.Right plate 57 is the rear portion of right flank and tabular components of right back portion of main composition unit housings 51.In addition, between the rearward end of the left ahead board on left and right directions 54 and the rear side end of right plate 57, be formed with and utilize outdoor fan 32 by the suction inlet 55b in air intake unit housings 51.Demarcation strip 58 is the tabular components that extend along vertical that are disposed on base plate 52, and it is configured to the inner space of unit housings 51 to be divided into two spaces (, supply fan room S1 and Machine Room S2), left and right.

Compressor 21 is for sucking the low-pressure refrigerant gas of kind of refrigeration cycle and this low-pressure refrigerant gas being compressed, after the high-pressure gas refrigerant in making kind of refrigeration cycle, and the compressor that the gas refrigerant of this high pressure is discharged., adopt the compressing member (not shown) rotary, vortex isometric(al) formula being contained in housing (not shown) to be contained in equally the closed-type compressor that the air compressor motor 21a in housing drives herein, using as compressor 21.The suction side of compressor 21 and discharge side are connected with four-way switching valve 22.In addition, compressor 21 is disposed in the S2 of Machine Room.

Four-way switching valve 22 is for switch the valve of the flow direction of cold-producing medium when switching cooling operation and heating running.Four-way switching valve 22 can link together the gas side of the discharge side of compressor 21 and outdoor heat converter 23 when cooling operation, and by the suction side of gas refrigerant communicating pipe 6 and compressor 21 link together (with reference to the solid line of the four-way switching valve 22 in Fig. 1).In addition, four-way switching valve 22 can link together the discharge side of compressor 21 and gas refrigerant communicating pipe 6 when heating running, and the suction side of the gas side of outdoor heat converter 23 and compressor 21 is linked together (with reference to the dotted line of the four-way switching valve 22 in Fig. 1).The suction side of four-way switching valve 22 and gas refrigerant communicating pipe 6, compressor 21 and the gas side of discharging side, outdoor heat converter 23 are connected.In addition, though not shown in Figure 2, four-way switching valve 22 is disposed in the S2 of Machine Room.

Outdoor heat converter 23 is the heat exchangers that work as the radiator of cold-producing medium when cooling operation and work as the evaporimeter of cold-producing medium when heating running.As outdoor heat converter 23, adopted the finned fin-tube heat exchanger of intersection being formed by heat pipe and a plurality of fin herein.The hydraulic fluid side of outdoor heat converter 23 is connected with expansion valve 24 via liquid refrigerant pipe 27, and gas side is connected with four-way switching valve 22 via gas refrigerant pipe 28.

More specifically, outdoor heat converter 23 has: a plurality of fins 61; And a plurality of heat pipes 62 (with reference to Fig. 2) of installing under the state that these fins 61 are run through in thickness of slab direction.As shown in Figure 3, in this outdoor heat converter 23, heat pipe 61 is divided into a plurality of (being three herein) system along the vertical direction, and formation makes these systems separate the first heat exchange paths 31, the second heat exchange paths 32 and the 3rd heat exchange paths 33.Herein, Fig. 3 is the figure that schematically illustrates outdoor heat converter 23 and near structure thereof.In addition, the liquid side of the first heat exchange paths 31～three heat exchange paths 33 is connected with coolant flow divider 64 via the first capillary 63a～the three capillary 63c respectively.Coolant flow divider 64 is the pipe components at the first capillary 63a～the three capillary 63c interflow of making to be connected with the liquid side of the first heat exchange paths 31～three heat exchange paths 33, and this coolant flow divider 64 is connected with liquid refrigerant pipe 27.The gas side of the first heat exchange paths 31～three heat exchange paths 33 is connected with collector 66 via the first collector communicating pipe 65a～three collector communicating pipe 65c respectively.Collector 66 is the pipe components at the first collector communicating pipe 65a～three collector communicating pipe 65c interflow of making to be connected with the gas side of the first heat exchange paths 31～three heat exchange paths 33, and this collector 66 is connected with gas refrigerant pipe 28.Like this, a plurality of (being three the herein) heat exchange paths 31～33 that forms outdoor heat converter 23 links together each other side by side via coolant flow divider 64 and collector 66.In addition, when cooling operation, all heat exchange paths 31～33 work as the radiator of cold-producing medium, and when heating running, all heat exchange paths 31～33 work as the evaporimeter of cold-producing medium.In addition, outdoor heat converter 23 (that is, heat exchange paths 31～33) is the L word shape from the left surface of unit housings 51 along the back side.In addition, although not shown in Fig. 2, go out, pipe component 63a～63c, 64, the 65a～65c, 66 that connect are disposed in ,Ji Machine Room, the space S2 of right-hand member side of outdoor heat converter 23 between heat exchange paths 31～33.

Expansion valve 24 is following electric expansion valves: when cooling operation, high pressure liquid refrigerant after heat radiation in outdoor heat converter 23 can be delivered to before indoor heat converter 41, this high pressure liquid refrigerant is reduced pressure, when heating running, can, the high pressure liquid refrigerant after heat radiation in indoor heat converter 41 is delivered to before outdoor heat converter 23, this high pressure liquid refrigerant be reduced pressure.Expansion valve 24 is located at liquid refrigerant pipe 27, and its one end was connected with liquid refrigerant communicating pipe 5, and the other end is connected with outdoor heat converter 23.In addition, though not shown in Fig. 2, go out, expansion valve 24 is disposed in the S2 of Machine Room.

Outdoor fan 25 is for outdoor air is sucked in outdoor unit 2, and is expelled to the pressure fan outside unit after outdoor air is supplied to outdoor heat converter 23., adopt the propeller fan being driven by outdoor fan motor 25a herein, using as outdoor fan 25.In addition, outdoor fan 25 is disposed at the front side of the outdoor heat converter 23 in supply fan room S1.When drive chamber's external fan 23, via the back side of unit housings 51 and suction inlet 55a, the 55b of left surface, air intake is inner, and after flowing through outdoor heat converter 23, the outside blow out air from the blow-off outlet 54a of the front surface of unit housings 51 towards unit housings 51.By this, outdoor heat converter 23 is the heat exchangers that carry out the heat radiation of cold-producing medium using outdoor air as cooling source or make cold-producing medium evaporation using outdoor air as heating source.

Defrosting stream mechanism 26 is for making the cold-producing medium that is delivered to outdoor heat converter 23 from indoor heat converter 41 not flow into coolant flow divider 64, but is delivered to the mechanism of the gas side of the heat exchange paths of selecting arbitrarily in a plurality of heat exchange paths 31～33.This defrosting stream mechanism 26 is set as for carrying out the running of aftermentioned heating and defrosting.This heating and defrosting running is on one side any heat exchange paths in the heat exchange paths 31～33 of formation outdoor heat converter 23 to be defrosted, Yi Bian make to be delivered to from outdoor heat converter 41 running of the cold-producing medium evaporation of outdoor heat converter 23.Defrosting stream mechanism 26 mainly has: heat exchange paths supply pipe 71; Many (being three herein) heat exchange paths branched pipe 72a～72c; Many (being three herein) branched pipe side heat exchange paths selector valve 73a～73c; Many (being three herein) header sides heat exchange paths selector valve 74a～74c; And isocon side selector valve 75.In addition, although not shown in Fig. 2, go out, defrosting stream mechanism 26 (that is, refrigerant pipe and valve 71,72a～72c, 73a～73c, 74a～74c, 75) is disposed in the S2 of Machine Room.

Heat exchange paths supply pipe 71 is that the cold-producing medium that makes to be delivered to outdoor heat converter 23 from indoor heat converter 41 is before flowing into coolant flow divider 64, from the refrigerant pipe of liquid refrigerant Guan27 branch.One end of heat exchange paths supply pipe 71 and being connected with the part between coolant flow divider 64 at expansion valve 24 in liquid refrigerant pipe 27, the other end is connected with heat exchange paths branched pipe 72a～72c.

The first heat exchange paths branched pipe 72a～three heat exchange paths branched pipe 72c is for being supplied to the refrigerant pipe of the gas side of the first heat exchange paths 31～three heat exchange paths 33 at the mobile cold-producing medium of heat exchange paths supply pipe 71.One end of the first heat exchange paths branched pipe 72a～three heat exchange paths branched pipe 72c is connected with heat exchange paths supply pipe 71 respectively, and the other end is connected with the first collector communicating pipe 65a～three collector communicating pipe 65c respectively.

The first branched pipe side heat exchange paths selector valve 73a～three branched pipe side heat exchange paths selector valve 73c is for together with the first header sides heat exchange paths selector valve 74a～three header sides heat exchange paths selector valve 74c, to the magnetic valve that the gas side that is delivered to which heat exchange paths in heat exchange paths 31～33 at the mobile cold-producing medium of heat exchange paths supply pipe 71 is selected.The first branched pipe side heat exchange paths selector valve 73a～three branched pipe side heat exchange paths selector valve 73c is located at respectively the first heat exchange paths branched pipe 72a～three heat exchange paths branched pipe 72c.In addition,, when cooling operation and while heating running, the first branched pipe side heat exchange paths selector valve 73a～three branched pipe side heat exchange paths selector valve 73c is all closed.In addition, when heating and defrosting turns round, open the corresponding branched pipe side heat exchange paths selector valve of the heat exchange paths with defrosting in the first branched pipe side heat exchange paths selector valve 73a～three branched pipe side heat exchange paths selector valve 73c, and close the branched pipe side heat exchange paths selector valve corresponding with heat exchange paths in addition.

First header sides heat exchange paths selector valve 74a～three minute header sides heat exchange paths selector valve 74c is for together with the first branched pipe side heat exchange paths selector valve 73a～three branched pipe side heat exchange paths selector valve 73c, to the magnetic valve that the gas side that is delivered to which heat exchange paths in heat exchange paths 31～33 at the mobile cold-producing medium of heat exchange paths supply pipe 71 is selected.The first header sides heat exchange paths selector valve 74a～three header sides heat exchange paths selector valve 74c is located at respectively the position of other end connection in the first collector communicating pipe 65a～three collector communicating pipe 65c and the first heat exchange paths branched pipe 72a～three heat exchange paths branched pipe 72c and the part between collector 66.In addition,, when cooling operation and while heating running, the first header sides heat exchange paths selector valve 74a～three header sides heat exchange paths selector valve 74c is all opened.In addition, when heating and defrosting turns round, close the corresponding header sides heat exchange paths selector valve of the heat exchange paths with defrosting in the first header sides heat exchange paths selector valve 74a～three header sides heat exchange paths selector valve 74c, and open the header sides heat exchange paths selector valve corresponding with heat exchange paths in addition.

Isocon side selector valve 75 be for to the cold-producing medium that whether makes to be delivered to outdoor heat converter 23 from indoor heat converter 41 before flowing into current divider 64, the magnetic valve selected from liquid refrigerant Guan27 branch.Isocon side selector valve 75 is located at the position that branches out heat exchange paths supply pipe 71 in liquid refrigerant pipe 27 and the part between coolant flow divider 64.In addition,, when cooling operation and while heating running, open isocon side selector valve 75.In addition, when heating and defrosting turns round, close isocon side selector valve 75.

In addition, in outdoor unit 2, be provided with the outdoor heat exchange temperature sensor 67 that the saturation temperature Tsat of cold-producing medium mobile in outdoor heat converter 23 is detected.Herein, outdoor heat exchange temperature sensor 67 be located at outdoor heat converter 23 the first heat exchange paths 31 liquid side near.

In addition, outdoor unit 2 has the outdoor control part 29 of controlling forming the action of the each several part of outdoor unit 2.In addition, outdoor control part 29 has microcomputer for outdoor unit 2 is controlled, memory etc., thereby can between the indoor control part 49 of itself and indoor unit 4, carry out the exchange of control signal etc.

In addition by outdoor control part 29 and indoor control part 49, formed, the control part 8 (with reference to Fig. 1 and Fig. 4) of the running control etc. of carrying out aircondition 1.At this, Fig. 4 is the control block diagram of aircondition 1.

(action)

Then, to thering is the action of the aircondition 1 of said structure, describe.In order to carry out the control of the required various device of following action, various processing etc., utilize control part 8 to carry out.

As the running of aircondition 1, the heating and defrosting that exists the defrosting that heats running and carry out outdoor heat converter 23 carry out the cooling operation of indoor refrigeration, only to carry out indoor heating to carry out indoor heating on one side turns round.Action while below, using Fig. 5～Fig. 8 to turn round describes each.Herein, Fig. 5 means the mobile figure of aircondition 1 inner refrigerant while heating running.Fig. 6 is the flow chart of heating and defrosting running.The figure of the flow of refrigerant (carrying out the situation of the defrosting of the first heat exchange paths 31) in the aircondition 1 when Fig. 7 means heating and defrosting running.Fig. 8 is pressure-enthalpy line chart of the kind of refrigeration cycle while illustrating heating and defrosting running.

-cooling operation-

Cooling operation is to make the cold-producing medium running of circulation in compressor 21, outdoor heat converter 23, indoor heat converter 41, compressor 21 successively.In this cooling operation, outdoor heat converter 23 works as the radiator of cold-producing medium, and indoor heat converter 41 works as the evaporimeter of cold-producing medium, by this, to room air, carries out cooling.

In cooling operation, switch four-way switching valve 22, using and form that outdoor heat converter 23 works as the radiator of cold-producing medium and state (being the state representing with solid line of the four-way switching valve 22 of Fig. 1) that indoor heat converter 41 works as the evaporimeter of cold-producing medium.In addition, the first branched pipe side heat exchange paths selector valve 73a～three branched pipe side heat exchange paths selector valve 73c is closed, the first header sides heat exchange paths selector valve 74a～three header sides heat exchange paths selector valve 74c is opened, the state of isocon side selector valve 75 in being opened.That is, in the heat exchange paths supply pipe 71 and the first heat exchange paths branched pipe 72a～three heat exchange paths branched pipe 72c of defrosting stream mechanism 26, in the immobilising state of cold-producing medium.

In the refrigerant loop 10 of this state, the low pressure refrigerant in kind of refrigeration cycle is inhaled into compressor 21, and is discharged from after the high pressure in being compressed to kind of refrigeration cycle.High-pressure refrigerant from compressor 21 is discharged is transported to outdoor heat converter 23 via four-way switching valve 22.The high-pressure refrigerant of then, discharging from compressor 21 is transported to the gas side of the heat exchange paths 31～33 of outdoor heat converter 23 via four-way switching valve 22, gas refrigerant pipe 28, collector 66, collector communicating pipe 65a～65c and header sides heat exchange paths selector valve 74a～74c.Subsequently, the high-pressure refrigerant that is transported to the gas side of heat exchange paths 31～33 carries out heat exchange and dispels the heat with the outdoor air being come by outdoor fan 25 supplies in heat exchange paths 31～33.Then, in heat exchange paths 31～33, the high-pressure refrigerant after heat radiation is delivered to expansion valve 24 from the liquid side of heat exchange paths 31～33 via capillary 63a～63c, coolant flow divider 64, liquid refrigerant pipe 27 and isocon side selector valve 75.The cold-producing medium that is transported to expansion valve 24 is depressurized to the low pressure in kind of refrigeration cycle.In expansion valve 24, post-decompression low pressure refrigerant is transported to indoor heat converter 41 via hydraulic fluid side communicating pipe 5.The low pressure refrigerant that is transported to indoor heat converter 41 carries out heat exchange with room air and evaporates in indoor heat converter 41.Low pressure refrigerant in indoor heat converter 41 after evaporation is sucked compressor 21 again via gas refrigerant communicating pipe 6 and four-way switching valve 22.

-heat running-

Heating running is to make the cold-producing medium running of circulation in compressor 21, indoor heat converter 41, outdoor heat converter 23, compressor 21 successively.At this, heat in running, indoor heat converter 41 works as the radiator of cold-producing medium, and outdoor heat converter 23 works as the evaporimeter of cold-producing medium, by this, room air is heated.

In heating running, switch four-way switching valve 22, using and form that indoor heat converter 41 works as the radiator of cold-producing medium and state (being the state dotting of the four-way switching valve 22 of Fig. 1 and Fig. 5) that outdoor heat converter 23 works as the evaporimeter of cold-producing medium.In addition, the first branched pipe side heat exchange paths selector valve 73a～three branched pipe side heat exchange paths selector valve 73c is closed, the first header sides heat exchange paths selector valve 74a～three header sides heat exchange paths selector valve 74c is opened, the state of isocon side selector valve 75 in being opened.That is, in the heat exchange paths supply pipe 71 and the first heat exchange paths branched pipe 72a～three heat exchange paths branched pipe 72c of defrosting stream mechanism 26, in the immobilising state of cold-producing medium.

In the refrigerant loop 10 of this state, the low pressure refrigerant in kind of refrigeration cycle is inhaled into compressor 21, and is discharged from after the high pressure in being compressed to kind of refrigeration cycle.High-pressure refrigerant from compressor 21 is discharged is transported to indoor heat converter 41 via four-way switching valve 22 and via gas refrigerant communicating pipe 6.The high-pressure refrigerant that is transported to indoor heat converter 41 carries out heat exchange with room air and dispels the heat in indoor heat converter 41.High-pressure refrigerant in indoor heat converter 41 after heat radiation is transported to expansion valve 24 via liquid refrigerant communicating pipe 5, and is depressurized to the low pressure in kind of refrigeration cycle.In expansion valve 24, post-decompression low pressure refrigerant is transported to outdoor heat converter 23.Then, in expansion valve 24, post-decompression low pressure refrigerant is transported to the liquid side of the heat exchange paths 31～33 of outdoor heat converter 23 via liquid refrigerant pipe 27, isocon side selector valve 75, coolant flow divider 64 and capillary 63a～63c.Subsequently, the low pressure refrigerant that is transported to the liquid side of heat exchange paths 31～33 carries out heat exchange and evaporates with the outdoor air being come by outdoor fan 25 supplies in heat exchange paths 31～33.Then, in heat exchange paths 31～33, the low pressure refrigerant after evaporation is sucked compressor 21 from the gas side of heat exchange paths 31～33 again via collector communicating pipe 65a～65c, header sides heat exchange paths selector valve 74a～74c, collector 66, gas refrigerant pipe 28 and four-way switching valve 22.

-heating and defrosting running-

Heating and defrosting running is to make in the same manner the cold-producing medium running of circulation in compressor 21, indoor heat converter 41, outdoor heat converter 23, compressor 21 successively when heating running on one side, Yi Bian the running that utilizes 26 pairs of outdoor heat converters 23 of defrosting stream mechanism to defrost.In this heating and defrosting running, indoor heat converter 41 works as the radiator of cold-producing medium, and any one heat exchange paths in the first heat exchange paths 31～three heat exchange paths 33 of outdoor heat converter 23 works as the radiator of cold-producing medium, and remaining heat exchange paths 31～33 works as the evaporimeter of cold-producing medium.By this, Yi Bian carry out successively the defrosting of the first heat exchange paths 31～33 of outdoor heat converter 23, Yi Bian room air is heated.

The switching state of the four-way switching valve 22 in heating and defrosting running with heat while turning round identical.That is the state (that is, the state dotting of the four-way switching valve 22 of Fig. 1 and Fig. 7) that, four-way switching valve 22 works as the radiator of cold-producing medium in indoor heat converter 41 and outdoor heat converter 23 works as the evaporimeter of cold-producing medium.In addition, in order to carry out successively the defrosting of the first heat exchange paths 31～three heat exchange paths 33 of outdoor heat converter 23, selector valve 73a～73c, 74a～74c, 75 be switched to from cooling operation and heat when running different open closed condition.That is, in heating and defrosting running, in the heat exchange paths supply pipe 71 and the first heat exchange paths branched pipe 72a～three heat exchange paths branched pipe 72c of defrosting stream mechanism 26, the state in flow of refrigerant.Below, also comprise that action when interiorly heating and defrosting is turned round from the beginning of heating and defrosting running to the step till finishing is elaborated.

First, in step S1, because heating running, frosting degree in outdoor heat converter 23 is increased, thereby judge whether needing to defrost.Can consider according to heating the duration of running, the temperature of outdoor heat converter 23 is carried out the judgement whether this defrosting is necessary, but herein, according to being judged by the detected saturation temperature Tsat of outdoor heat exchange temperature sensor 67.Particularly, at saturation temperature Tsat, in the situation that set point of temperature Tm is following, is judged to be and need to carries out the defrosting of outdoor heat converter 23.In addition, in step S1, in the situation that be judged to be, need to carry out the defrosting of outdoor heat converter 23, transfer to the processing of step S2.

Then,, in step S2～S7, carry out successively the defrosting of the first heat exchange paths 31～three heat exchange paths 33 of outdoor heat converter 23.In addition, substantially also can at random select the defrosting of the first heat exchange paths 31～three heat exchange paths 33, but when considering the drain water producing because of defrosting to be expelled to base plate 52 mobile of unit housings 51, from the top of outdoor heat converter 23, towards bottom, be comparatively desirable.Therefore,, according to the order of the first heat exchange paths 31, the second heat exchange paths 32, the 3rd heat exchange paths 33, defrost herein.

The defrosting of the first heat exchange paths 31 (step S2) is that selector valve 73a～73c, the 74a～74c by switching

defrosting stream mechanism

26,75 the closed condition of opening are carried out.Particularly, switch to following state: open the first branched pipe side heat exchange paths selector valve 73a, close the second branched pipe side heat exchange

paths selector valve

73b, 73c, close the first header sides heat exchange paths selector valve 74a, open the second header sides heat exchange paths selector valve 74b, the 3rd header sides heat exchange paths selector valve 74c, close isocon side selector valve 75.In addition,, heat running until before the beginning of the defrosting of the first heat exchange paths 31 herein, therefore, carry out following switching action: open the first branched pipe side heat exchange paths selector valve 73a, close the first header sides heat exchange paths selector valve 74a, close isocon side selector valve 75.By this, heat exchange paths supply pipe 71 and the mobile state of the first heat exchange paths branched pipe 72a towards defrosting stream mechanism 26 in cold-producing medium.

In the refrigerant loop 10 of this state, the cold-producing medium of the low pressure in kind of refrigeration cycle (with reference to the some A of Fig. 7 and Fig. 8) is inhaled into compressor 21, and is discharged from (with reference to the some B of Fig. 7 and Fig. 8) after the high pressure in being compressed to kind of refrigeration cycle.High-pressure refrigerant from compressor 21 is discharged is transported to indoor heat converter 41 via four-way switching valve 22 and via gas refrigerant communicating pipe 6.The high-pressure refrigerant that is delivered to indoor heat converter 41 carries out heat exchange and dispel the heat (with reference to the some C of Fig. 7 and Fig. 8) with room air in indoor heat converter 41.Hereto, with to heat when running identical.High-pressure refrigerant in indoor heat converter 41 after heat radiation is transported to expansion valve 24 via liquid refrigerant communicating pipe 5, and is depressurized as the high pressure in kind of refrigeration cycle and the pressure between low pressure (pressing hereinafter referred to as centre) (with reference to the some D of Fig. 7 and Fig. 8).In the middle of post-decompression in expansion valve 24, compression refrigerant is transported to outdoor heat converter 23.Then, the middle compression refrigerant after being depressurized in expansion valve 24 is delivered to heat exchange paths supply pipe 71 from liquid refrigerant pipe 27.In addition the middle compression refrigerant that, is delivered to heat exchange paths supply pipe 71 is via the first heat exchange paths branched pipe 72a, the first branched pipe side heat exchange paths selector valve 73a and the first collector communicating pipe 65a and be transported to the gas side of the first heat exchange paths 31 of outdoor heat converter 23.Like this, the cold-producing medium that is delivered to outdoor heat converter 23 from indoor heat converter 41 does not flow into coolant flow divider 64, but is all transported to the gas side of the first heat exchange paths 31.In addition, the middle compression refrigerant that is delivered to the gas side of the first heat exchange paths 31 flows through in the first heat exchange paths 31 towards liquid side from the gas side of the first heat exchange paths 31, so that be attached to the frost of the first heat exchange paths 31 of outdoor heat converter 23, melts (with reference to the some E of Fig. 7 and Fig. 8).By this, carry out the defrosting of the first heat exchange paths 31 of outdoor heat converter 23.Then, the middle compression refrigerant that flows through the first heat exchange paths 31 is transported to coolant flow divider 64 from the liquid side of the first heat exchange paths 31 via the first capillary 63a.Now, in the first capillary 63a, during with cooling operation, heat when running and compare and have middle the compression refrigerant that flow is larger mobile, therefore, during with cooling operation, the situation that heats when running flow of refrigerant compares, it is large that the pressure loss becomes, and is depressurized to the middle pressure (with reference to the some F of Fig. 7 and Fig. 8) of pressing between (being the pressure at the some E place of Fig. 7 and Fig. 8) and low pressure in kind of refrigeration cycle.In addition, owing to closing isocon side selector valve 75, therefore, the low pressure refrigerant that is delivered to coolant flow divider 64 flows through in coolant flow divider 64 in the mode of turning back and branches to the second capillary 63b and three capillary 63c, and is transported to the liquid side of the second heat exchange paths 32 and the 3rd heat exchange paths 33.Now, cold-producing medium flows through the second capillary 63b and three capillary 63c and is depressurized to the low pressure (with reference to the some G of Fig. 7 and Fig. 8) in kind of refrigeration cycle.In addition, the low pressure refrigerant that is transported to the liquid side of the second heat exchange paths 32 and the 3rd heat exchange paths 33 flows through in the second heat exchange paths 32 and the 3rd heat exchange paths 33 from the liquid side vigor side end of the second heat exchange paths 32 and the 3rd heat exchange paths 33, and carries out heat exchange and evaporate (with reference to the some A of Fig. 7 and Fig. 8) with the outdoor air being come by outdoor fan 25 supplies.Then, in the second heat exchange paths 32, the 3rd heat exchange paths 33, the low pressure refrigerant after evaporation is inhaled into compressor 21 via the second collector communicating pipe 65b, the 3rd collector communicating pipe 65c, the second header sides heat exchange paths selector valve 74b, the 3rd header sides heat exchange paths selector valve 74c, collector 66, gas refrigerant pipe 28 and four-way switching valve 22 again from the gas side of the second heat exchange paths 32, the 3rd heat exchange paths 33.Like this, continue indoor heating, and start the defrosting of the first heat exchange paths 31.Then, carry out the defrosting of the first heat exchange paths 31 until the defrosting of the first heat exchange paths 31 finishes (step S3)., carry out the defrosting of the first heat exchange paths 31 herein, until the defrosting time t1 of the first heat exchange paths 31 is through predefined stipulated time (, can be considered as the time that the defrosting of the first heat exchange paths 31 finishes).

The defrosting of the second heat exchange paths 32 (step S4) is by selector valve 73a～73c, the 74a～74c of switching

defrosting stream mechanism

26,75 the closed condition of opening, to be undertaken in the same manner with the first heat exchange paths 31.Particularly, switch to following state: open the second branched pipe side heat exchange paths selector valve 73b, close the first, the 3rd branched pipe side heat exchange

paths selector valve

73a, 73c, close the second header sides heat exchange paths selector valve 74b, open the first, the 3rd header sides heat exchange

paths selector valve

74a, 74c, close isocon side selector valve 75.In addition, herein, carry out the defrosting of the first heat exchange paths 31 until before the defrosting of the second heat exchange paths 32 starts, therefore, carry out following switching action, open the second branched pipe side heat exchange paths selector valve 73b, close the first branched pipe side heat exchange paths selector valve 73a, open the first header sides heat exchange paths selector valve 74a, and close the second header sides heat exchange paths selector valve 74b.By this, heat exchange paths supply pipe 71 and the mobile state of the second heat exchange paths branched pipe 72b towards defrosting stream mechanism 26 in cold-producing medium.

In the refrigerant loop 10 of this state, identical during the defrosting of the low pressure refrigerant in kind of refrigeration cycle and the first heat exchange paths 31, in compressor 21, be compressed into the high pressure in kind of refrigeration cycle, in indoor heat converter 41, carry out heat exchange with room air and dispel the heat, and in expansion valve 24, be depressurized in kind of refrigeration cycle in the middle of press and be transported to outdoor heat converter 23.Then, the middle compression refrigerant after being depressurized in expansion valve 24 is delivered to heat exchange paths supply pipe 71 from liquid refrigerant pipe 27.In addition the middle compression refrigerant that, is delivered to heat exchange paths supply pipe 71 is via the second heat exchange paths branched pipe 72b, the second branched pipe side heat exchange paths selector valve 73b and the second collector communicating pipe 65b and be transported to the gas side of the second heat exchange paths 32 of outdoor heat converter 23.Like this, the cold-producing medium that is delivered to outdoor heat converter 23 from indoor heat converter 41 does not flow into coolant flow divider 64, but is all transported to the gas side of the second heat exchange paths 32.In addition, the middle compression refrigerant that is delivered to the gas side of the second heat exchange paths 32 flows through in the second heat exchange paths 32 towards liquid side from the gas side of the second heat exchange paths 32, so that be attached to the frost of the second heat exchange paths 32 of outdoor heat converter 23, melts.By this, carry out the defrosting of the second heat exchange paths 32 of outdoor heat converter 23.Then, the middle compression refrigerant that flows through the second heat exchange paths 32 is transported to coolant flow divider 64 from the liquid side of the second heat exchange paths 32 via the second capillary 63b.Now, in the second capillary 63b, during with cooling operation, heat when running and compare and have middle the compression refrigerant that flow is larger mobile, therefore, during with cooling operation, the situation that heats when running flow of refrigerant compares, it is large that the pressure loss becomes, be depressurized in kind of refrigeration cycle in the middle of press and low pressure between pressure.In addition, owing to closing isocon side selector valve 75, therefore, the low pressure refrigerant that is delivered to coolant flow divider 64 flows through in coolant flow divider 64 in the mode of turning back and branches to the first capillary 63a and three capillary 63c, and is transported to the liquid side of the first heat exchange paths 31 and the 3rd heat exchange paths 33.Now, cold-producing medium flows through the first capillary 63a and three capillary 63c and is depressurized to the low pressure in kind of refrigeration cycle.In addition, the low pressure refrigerant that is transported to the liquid side of the first heat exchange paths 31 and the 3rd heat exchange paths 33 flows through in the first heat exchange paths 31 and the 3rd heat exchange paths 33 from the liquid side vigor side end of the first heat exchange paths 31 and the 3rd heat exchange paths 33, and carries out heat exchange and evaporate with the outdoor air being come by outdoor fan 25 supplies.Then, in the first heat exchange paths 31, the 3rd heat exchange paths 33, the low pressure refrigerant after evaporation is inhaled into compressor 21 via the first, the 3rd collector communicating pipe 65a, 65c, first, the 3rd header sides heat exchange paths selector valve 74a, 74c, collector 66, gas refrigerant pipe 28 and four-way switching valve 22 again from the gas side of the first heat exchange paths 31, the 3rd heat exchange paths 33.Like this, continue indoor heating, and start the defrosting of the second heat exchange paths 32.Then, carry out the defrosting of the second heat exchange paths 32 until the defrosting of the second heat exchange paths 32 finishes (step S5)., carry out the defrosting of the second heat exchange paths 32 herein, until the defrosting time t2 of the second heat exchange paths 32 is through predefined stipulated time (, can be considered as the time that the defrosting of the second heat exchange paths 32 finishes).In addition, the second heat exchange paths 32 is different with the above-below direction position of other heat exchange paths 31,33, and therefore, the time that can be considered as defrosting end is also different.Therefore, comparatively it is desirable to, make stipulated time of defrosting of the second heat exchange paths 32 different from the stipulated time of the defrosting of other heat exchange paths 31,33.Herein, heat exchange paths 31～33 is different with respect to the position relationship of outdoor fan 25, and the air quantity that flows through the outdoor air of heat exchange paths 31～33 can produce deviation, and therefore, the larger heat exchange paths of air quantity is in the many tendencies of white quantitative change.Therefore, can consider to make stipulated time of defrosting of stipulated time of defrosting of the heat exchange paths that air quantity is larger heat exchange paths less than air quantity long.

The defrosting of the 3rd heat exchange paths 33 (step S6) is by selector valve 73a～73c, the 74a～74c of switching

defrosting stream mechanism

26,75 the closed condition of opening, to be undertaken in the same manner with the first heat exchange paths 31, the second heat exchange paths 32.Particularly, switch to following state: open the 3rd branched pipe side heat exchange paths selector valve 73c, close first, second branched pipe side heat exchange

paths selector valve

73a, 73b, close the 3rd header sides heat exchange paths selector valve 74c, open first, second header sides heat exchange

paths selector valve

74a, 74b, close isocon side selector valve 75.In addition, herein, carry out the defrosting of the second heat exchange paths 32 until before the defrosting of the 3rd heat exchange paths 33 starts, therefore, carry out following switching action, open the 3rd branched pipe side heat exchange paths selector valve 73c, close the second branched pipe side heat exchange paths selector valve 73b, open the second header sides heat exchange paths selector valve 74b, and close the 3rd header sides heat exchange paths selector valve 74c.By this, heat exchange paths supply pipe 71 and the mobile state of the 3rd heat exchange paths branched pipe 72c towards defrosting stream mechanism 26 in cold-producing medium.

In the refrigerant loop 10 of this state, identical during the defrosting of the low pressure refrigerant in kind of refrigeration cycle and first, second heat exchange paths 31,32, in compressor 21, be compressed into the high pressure in kind of refrigeration cycle, in indoor heat converter 41, carry out heat exchange with room air and dispel the heat, and in expansion valve 24, be depressurized in kind of refrigeration cycle in the middle of press and be transported to outdoor heat converter 23.Then, the middle compression refrigerant after being depressurized in expansion valve 24 is delivered to heat exchange paths supply pipe 71 from liquid refrigerant pipe 27.In addition the middle compression refrigerant that, is delivered to heat exchange paths supply pipe 71 is via the 3rd heat exchange paths branched pipe 72c, the 3rd branched pipe side heat exchange paths selector valve 73c and the 3rd collector communicating pipe 65c and be transported to the gas side of the 3rd heat exchange paths 33 of outdoor heat converter 23.Like this, the cold-producing medium that is delivered to outdoor heat converter 23 from indoor heat converter 41 does not flow into coolant flow divider 64, but is all transported to the gas side of the 3rd heat exchange paths 33.In addition, the middle compression refrigerant that is delivered to the gas side of the 3rd heat exchange paths 33 flows through in the 3rd heat exchange paths 33 towards liquid side from the gas side of the 3rd heat exchange paths 33, so that be attached to the frost of the 3rd heat exchange paths 33 of outdoor heat converter 23, melts.By this, carry out the defrosting of the 3rd heat exchange paths 33 of outdoor heat converter 23.Then, the middle compression refrigerant that flows through the 3rd heat exchange paths 33 is transported to coolant flow divider 64 from the liquid side of the 3rd heat exchange paths 33 via three capillary 63c.Now, in three capillary 63c, during with cooling operation, heat when running and compare and have middle the compression refrigerant that flow is larger mobile, therefore, during with cooling operation, the situation that heats when running flow of refrigerant compares, it is large that the pressure loss becomes, be depressurized in kind of refrigeration cycle in the middle of press and low pressure between pressure.In addition, owing to closing isocon side selector valve 75, therefore, the low pressure refrigerant that is delivered to coolant flow divider 64 flows through in coolant flow divider 64 in the mode of turning back and branches to the first capillary 63a and the second capillary 63b, and is transported to the liquid side of the first heat exchange paths 31 and the 3rd heat exchange paths 32.Now, cold-producing medium flows through the first capillary 63a and the second capillary 63b and is depressurized to the low pressure in kind of refrigeration cycle.In addition, the low pressure refrigerant that is transported to the liquid side of the first heat exchange paths 31 and the second heat exchange paths 32 flows through in the first heat exchange paths 31 and the second heat exchange paths 32 from the liquid side vigor side end of the first heat exchange paths 31 and the second heat exchange paths 32, and carries out heat exchange and evaporate with the outdoor air being come by outdoor fan 25 supplies.Then, in the first heat exchange paths 31, the second heat exchange paths 32, the low pressure refrigerant after evaporation is inhaled into compressor 21 via first, second collector communicating pipe 65a, 65b, first, second header sides heat exchange paths selector valve 74a, 74b, collector 66, gas refrigerant pipe 28 and four-way switching valve 22 again from the gas side of the first heat exchange paths 31, the second heat exchange paths 32.Like this, continue indoor heating, and start the defrosting of the 3rd heat exchange paths 33.Then, carry out the defrosting of the 3rd heat exchange paths 33 until the defrosting of the second heat exchange paths 33 finishes (step S7)., carry out the defrosting of the 3rd heat exchange paths 33 herein, until the defrosting time t3 of the 3rd heat exchange paths 33 is through predefined stipulated time (, can be considered as the time that the defrosting of the 3rd heat exchange paths 33 finishes).In addition, considered that heat exchange paths 31～33 is with respect to position relationship of outdoor fan 25 etc., it is also comparatively desirable making stipulated time of defrosting of the 3rd heat exchange paths 33 different with the stipulated time of the defrosting of other heat exchange paths 31,32.

In addition, in the processing by above-mentioned steps S2～S7, make after the defrosting of all heat exchange paths 31～33 of outdoor heat converter 23 finishes, to return back to and heat running (step S8).

As mentioned above, carry out following heating and defrosting running: utilize defrosting stream mechanism 26, on one side any heat exchange paths in heat exchange paths 31～33 is defrosted, make to be delivered to from indoor heat converter 41 the cold-producing medium evaporation of outdoor heat converter 23 on one side.In addition, by successively a plurality of heat exchange paths 31～33 being carried out to this heating and defrosting running, Yi Bian continue indoor heating, Yi Bian outdoor heat converter 23 integral body are defrosted.

(feature)

In the aircondition 1 of present embodiment, there is following characteristics.

As mentioned above, aircondition 1 is by connecting compressor 21, indoor heat converter 41, outdoor heat converter 23 to form successively, wherein, 21 pairs of cold-producing mediums of above-mentioned compressor compress, cold-producing medium after 41 pairs of above-mentioned indoor heat converters are compressed in compressor 21 dispels the heat, and above-mentioned outdoor heat converter 23 evaporates the cold-producing medium after heat radiation in indoor heat converter 41 by carrying out heat exchange with outdoor air.Aircondition 1 can make cold-producing medium successively in compressor 21, indoor heat converter 41, outdoor heat converter 23, compressor 21 circulation heat running.Outdoor heat converter 23 has a plurality of (being three the herein) heat exchange paths 31～33 connecting side by side each other.The liquid side utilization of a plurality of heat exchange paths 31～33 for the cold-producing medium that is delivered to outdoor heat converter 23 from indoor heat converter 41 is branched to a plurality of heat exchange paths 31～33 liquid side coolant flow divider 64 and connect side by side.

In addition, the said structure of take in aircondition 1 is also provided with defrosting stream mechanism 26 as prerequisite, this defrosting stream mechanism 26 is for making the cold-producing medium that is delivered to outdoor heat converter 23 from indoor heat converter 41 not flow into coolant flow divider 64, but is delivered to the gas side of the heat exchange paths of selecting arbitrarily in a plurality of heat exchange paths 31～33.In addition, in aircondition 1, carry out following heating and defrosting running: utilize defrosting stream mechanism 26 any heat exchange paths to be defrosted, Yi Bian make to be delivered to from indoor heat converter 41 the cold-producing medium evaporation of outdoor heat converter 23 on one side.First this heating and defrosting running utilizes defrosting stream mechanism 26 to make the cold-producing medium that is delivered to outdoor heat converter 23 from indoor heat converter 41 not flow into coolant flow divider 64, but is flow through in any heat exchange paths towards liquid side by the gas side of any heat exchange paths.Then the cold-producing medium that, makes to flow through any heat exchange paths flows through in other heat exchange paths from the liquid side vigor side end of other heat exchange paths except any heat exchange paths via coolant flow divider 64.Then, in aircondition 1, by utilizing successively defrosting stream mechanism 26 to carry out heating and defrosting running for a plurality of heat exchange paths 31～33, can carry out the defrosting of outdoor heat converter 23 integral body.

On the other hand, in the Defrost mode of patent documentation 1, each liquid side by a plurality of heat exchange paths at outdoor heat converter arranges magnetic valve, and close the magnetic valve of the heat exchange paths of selecting arbitrarily, stop cold-producing medium flowing in this heat exchange paths, and utilize the heat of outdoor air to carry out the defrosting of any heat exchange paths.In addition, in the Defrost mode of patent documentation 2, by be provided for by a part for the cold-producing medium of discharging from compressor be delivered to outdoor heat converter a plurality of heat exchange paths liquid side and be not delivered to the bypass of indoor heat converter, and via this bypass, a part for the cold-producing medium of discharging from compressor is delivered to any heat exchange paths of outdoor heat converter and is not delivered to indoor heat converter, thereby utilize the heat of cold-producing medium to carry out the defrosting (with reference to Fig. 9) of any heat exchange paths.Herein, Fig. 9 is the pressure-enthalpy line chart of kind of refrigeration cycle that illustrates defrosting when running of existing (patent documentation 2).

On the other hand, in the heating and defrosting running of aircondition 1, as mentioned above, by whole flows of the cold-producing medium after compressed in compressor 21 be delivered to indoor heat converter 41 for heating (with reference to Fig. 7 and Fig. 8 from a B to the stroke of putting till C), then, utilize the heat that is delivered to the cold-producing medium of outdoor heat converter 23 from indoor heat converter 41 defrost (with reference to Fig. 7 and Fig. 8 from a D to the stroke of putting till E).

Therefore, in aircondition 1, different from the Defrost mode of patent documentation 2, whole flows of the cold-producing medium after compressed in compressor 21 are supplied to indoor heating, therefore, can reduce heating capacity hardly.And in aircondition 1, different from the Defrost mode of patent documentation 1,2, the defrosting by whole flows of the cold-producing medium after compressed in compressor 21 for any heat exchange paths of outdoor heat converter 23, therefore, can obtain higher defrosting ability.By this, compared with the Defrost mode of patent documentation 1,2, can within the shorter time, finish defrosting, and extend the time heating, thereby can improve the heating capacity of integration.In addition, in aircondition 1, different from the Defrost mode of patent documentation 1, by the heat of cold-producing medium, for defrosting, therefore, externally gas temperature is under 0 ℃ of following meteorological condition, also can carry out the defrosting of outdoor heat converter 23.

In addition, in aircondition 1, from forming the heat exchange paths (being the first heat exchange paths 31) on the top of outdoor heat converter 23 herein, towards the heat exchange paths (being the 3rd heat exchange paths 33) that forms bottom herein, defrost.Therefore, the drain water producing because of defrosting successfully can be expelled to the base plate 52 of unit housings 51.

In addition, in aircondition 1, by the position of the having considered heat exchange paths stipulated times different and that set, to forming the heat exchange paths 31～33 of outdoor heat converter 23, defrost.Herein, consider because of the air quantity difference of heat exchange paths 31～33 with respect to the different outdoor airs that flow through heat exchange paths 31～33 that produce in the position of outdoor fan 25, make stipulated time of defrosting of stipulated time of defrosting of the heat exchange paths that air quantity is large heat exchange paths less than air quantity long.Therefore, can extend the stipulated time that makes greatly the defrosting of the many heat exchange paths of white quantitative change because of air quantity, and the stipulated time that makes the defrosting of the heat exchange paths that white quantitative change is few because air quantity is few can be shortened, by this, can be to have considered that the rational stipulated time of determining after the position difference of heat exchange paths defrosts rightly.

(variation 1)

In the heating and defrosting running of above-mentioned embodiment, as shown in the step S3 of Fig. 6, S5, S7, carry out the defrosting of each heat exchange paths 31～33 until defrosting time t1～t3 passes through the predefined stipulated time, but be not limited thereto.

Example as shown in figure 10, form the defrosting of the first heat exchange paths 31 defrosting at first in a plurality of (being three herein) heat exchange paths 31～33 of outdoor heat converter 23, until rise to set point of temperature above (step S11) by the detected saturation temperature Tsat of outdoor heat exchange temperature sensor 67.Herein, this set point of temperature is set to and can be considered as the temperature that the defrosting of the first heat exchange paths 31 finishes.In addition, also can measure defrosting time t1 now, according to this defrosting time t1, set the stipulated time (step S12) of the defrosting of second, third

heat exchange paths

32,33, and by the stipulated time of this setting, carry out the defrosting (step S5, S7) of second and third heat exchange paths 32,33.Now, both can be set as to the defrosting time t1 identical with the first heat exchange paths 31 stipulated time of second and third

heat exchange paths

32,33, in addition, set after also can further considering the position difference of heat exchange paths.In addition, Figure 10 is the flow chart of the heating and defrosting running of this variation.

Like this, in the heating and defrosting running of this variation, and only with the time, judge that the above-mentioned heating and defrosting running that the defrosting of each heat exchange paths finishes is different.Particularly, in the heating and defrosting running of this variation, according to the variations in temperature of the heat exchange paths defrosting at first, detect the end of defrosting, and according to the stipulated time that the time of now defrosting required by reality obtains, determine the end of the defrosting of other heat exchange paths.

Therefore, in the heating and defrosting running of this variation, according to outdoor heat converter 23 white state, by the required time of the defrosting of each each heat exchange paths of heating and defrosting running setting.Therefore, in the heating and defrosting running of this variation, and carry out the defrosting of each heat exchange paths until reach the situation of predefined stipulated time and compare, can set rightly by each heating and defrosting running the stipulated time of the defrosting of each heat exchange paths.

(variation 2)

In the aircondition 1 of above-mentioned embodiment and variation 1, defrosting stream mechanism 26 consists of heat exchange paths supply pipe 71, heat exchange paths branched pipe 72a～72c, branched pipe side heat exchange selector valve 73a～73c, header sides heat exchange selector valve 74a～74c and isocon side selector valve 75, but is not limited thereto.

Example as shown in FIG. 11 and 12, also can be used the transfer valve 77 of the integrated rear formation of branched pipe side heat exchange paths selector valve 73a～73c.Herein, transfer valve 77 is to have that to select be cold-producing medium mobile in heat exchange paths supply pipe 71 to be delivered to arbitrary heat exchange paths branched pipe in heat exchange paths branched pipe 72a～72c or towards the equal transfer valve of the function of refrigerant conveying not of arbitrary heat exchange paths branched pipe 72a～72c.Used revolving switch valve to using as transfer valve 77 herein.This transfer valve 77 is connected with heat exchange paths supply pipe 71 and heat exchange paths branched pipe 72a～72c.In addition, in the structure of this variation, in the control block diagram of Fig. 2, transfer valve 77 is connected with control part 8, to replace branched pipe side heat exchange paths selector valve 73a～73c.In addition, Figure 11 is the schematic configuration diagram of the aircondition 1 of this variation, and it means cold-producing medium in the aircondition 1 mobile figure when heating running.Figure 12 means the figure of cold-producing medium in the aircondition 1 of this variation flow (the carrying out the situation of the defrosting of the first heat exchange paths 31) when heating and defrosting turns round.

Even if in this structure, as shown in figure 11, by with towards arbitrary heat exchange paths branched pipe 72a～72c all not the mode of refrigerant conveying make transfer valve 77 action, also can carry out the heat running identical with above-mentioned embodiment.In addition, also can with heat under the operating state of identical transfer valve 77 of when running, carry out the cooling operation identical with above-mentioned embodiment.In addition, as shown in figure 12, by making transfer valve 77 actions cold-producing medium mobile in heat exchange paths supply pipe 71 is delivered to the mode of the arbitrary heat exchange paths branched pipe in heat exchange paths branched pipe 72a～72c, can carry out the heating and defrosting running identical with above-mentioned embodiment or variation 1.

In addition, in the structure of this variation, compare with the structure of above-mentioned embodiment and variation 1, can reduce the part number that forms defrosting stream mechanism 26.

(variation 3)

Example as shown in FIG. 13 and 14, also can be used the transfer valve 78 of heat exchange paths supply pipe 71, branched pipe side heat exchange paths selector valve 73a～73c and the 75 integrated rear formation of isocon side selector valve.Herein, transfer valve 78 is the transfer valves with following functions: selection makes flow of refrigerant mobile in liquid refrigerant pipe 27 be delivered to the arbitrary heat exchange paths branched pipe in heat exchange paths branched pipe 72a～72c to cold-producing medium isocon 64 or by this cold-producing medium, in the situation that be delivered to the arbitrary heat exchange paths branched pipe in heat exchange paths branched pipe 72a～72c, select cold-producing medium is delivered to which the heat exchange paths branched pipe in heat exchange paths branched pipe 72a～72c.Used revolving switch valve to using as transfer valve 78 herein.This transfer valve 78 is connected with liquid refrigerant pipe 27, heat exchange isocon 64 and heat exchange paths branched pipe 72a～72c.In addition, in the structure of this variation, in the control block diagram of Fig. 2, transfer valve 78 is connected with control part 8, to replace branched pipe side heat exchange paths selector valve 73a～73c and isocon side selector valve 75.In addition, Figure 13 is the schematic configuration diagram of the aircondition 1 of this variation, and it means cold-producing medium in the aircondition 1 mobile figure when heating running.Figure 14 means the figure of cold-producing medium in the aircondition 1 of this variation flow (the carrying out the situation of the defrosting of the first heat exchange paths 31) when heating and defrosting turns round.

Even if in this structure, as shown in figure 13, by so that in liquid refrigerant pipe 27 mobile flow of refrigerant to the mode of cold-producing medium isocon 64 make transfer valve 78 actions, also can carry out the heat running identical with above-mentioned embodiment.In addition, also can with heat under the operating state of identical transfer valve 78 of when running, carry out the cooling operation identical with above-mentioned embodiment.In addition, as shown in figure 14, by so that in liquid refrigerant pipe 27 mobile cold-producing medium do not flow to the mode that cold-producing medium isocon 64 is delivered to the arbitrary heat exchange paths branched pipe in heat exchange paths branched pipe 72a～72c and make transfer valve 78 actions, can carry out the heating and defrosting running identical with above-mentioned embodiment or variation 1.

In addition, in the structure of this variation, compare with the structure of above-mentioned embodiment and variation 1 and the structure of variation 2, can reduce the part number that forms defrosting stream mechanism 26.

(variation 4)

For example, shown in Figure 15 and Figure 16, also can use the transfer valve 79 of heat exchange paths branched pipe 72a～72c, branched pipe side heat exchange paths selector valve 73a～73c, header sides heat exchange paths selector valve 74a～74c and collector 66 integrated rear formation.Herein, transfer valve 79 is the transfer valves with following functions: select cold-producing medium mobile in heat exchange paths supply pipe 71 to be delivered to which in collector communicating pipe 65a～65c collector communicating pipe, and selecting is by except being transferred collector being connected with gas refrigerant pipe 28 collector communicating pipe communicating pipe of cold-producing medium mobile in heat exchange paths supply pipe 71, still towards the equal refrigerant conveying not of arbitrary collector communicating pipe 65a～65c.Used revolving switch valve to using as transfer valve 79 herein.This transfer valve 79 is connected with heat exchange paths supply pipe 71, collector communicating pipe 65a～65c and gas refrigerant pipe 28.In addition, in the structure of this variation, in the control block diagram of Fig. 2, transfer valve 79 is connected with control part 8, to replace branched pipe side heat exchange paths selector valve 73a～73c and header sides heat exchange selector valve 74a～74c.In addition, Figure 15 is the schematic configuration diagram of the aircondition 1 of this variation, and it means cold-producing medium in the aircondition 1 mobile figure when heating running.Figure 16 means the figure of cold-producing medium in the aircondition 1 of this variation flow (the carrying out the situation of the defrosting of the first heat exchange paths 31) when heating and defrosting turns round.

Even if in this structure, as shown in figure 15, by with towards arbitrary collector communicating pipe 65a～65c all not the mode of refrigerant conveying make transfer valve 79 action, also can carry out the heat running identical with above-mentioned embodiment.In addition, also can with heat under the operating state of identical transfer valve 79 of when running, carry out the cooling operation identical with above-mentioned embodiment.In addition, as shown in figure 16, by to select that cold-producing medium mobile in heat exchange paths supply pipe 71 is delivered to which in collector communicating pipe 65a～65c collector communicating pipe, and make collector except being transferred cold-producing medium mobile in heat exchange paths supply pipe 71 mode being connected with gas refrigerant pipe 28 collector communicating pipe communicating pipe make transfer valve 79 actions, can carry out the heating and defrosting running identical with above-mentioned embodiment or variation 1.

In addition, in the structure of this variation, compare with the structure of above-mentioned embodiment and variation 1 and the structure of

variation

2,3, can reduce the part number that forms defrosting stream mechanism 26.

(variation 5)

Example as shown in FIG. 17 and 18, also can be used the transfer valve 80 of heat exchange paths supply pipe 71, heat exchange paths branched pipe 72a～72c, branched pipe side heat exchange paths selector valve 73a～73c, header sides heat exchange paths selector valve 74a～74c, isocon side selector valve 75 and collector 66 integrated rear formation.Herein, transfer valve 80 is the transfer valves with following functions: selection is to make flow of refrigerant mobile in liquid refrigerant pipe 27 to cold-producing medium isocon 64, or this cold-producing medium is delivered to the arbitrary collector communicating pipe in collector communicating pipe 65a～65c, and makes except being transferred collector being connected with gas refrigerant pipe 28 collector communicating pipe communicating pipe of cold-producing medium mobile in liquid refrigerant pipe 27.Used revolving switch valve to using as transfer valve 80 herein.This transfer valve 80 is connected with liquid refrigerant pipe 27, cold-producing medium isocon 64, collector communicating pipe 65a～65c and gas refrigerant pipe 28.In addition, in the structure of this variation, in the control block diagram of Fig. 2, transfer valve 80 is connected with control part 8, to replace branched pipe side heat exchange paths selector valve 73a～73c, header sides heat exchange selector valve 74a～74c and isocon side selector valve 75.In addition, Figure 17 is the schematic configuration diagram of the aircondition 1 of this variation, and it means cold-producing medium in the aircondition 1 mobile figure when heating running.Figure 18 means the figure of cold-producing medium in the aircondition 1 of this variation flow (the carrying out the situation of the defrosting of the first heat exchange paths 31) when heating and defrosting turns round.

Even if in this structure, as shown in figure 17, by so that in liquid refrigerant pipe 27 mobile flow of refrigerant to the mode of cold-producing medium isocon 64 make transfer valve 80 actions, also can carry out the heat running identical with above-mentioned embodiment.In addition, also can with heat under the operating state of identical transfer valve 80 of when running, carry out the cooling operation identical with above-mentioned embodiment.In addition, as shown in figure 18, by to select that cold-producing medium mobile in liquid refrigerant pipe 27 is delivered to which in collector communicating pipe 65a～65c collector communicating pipe, and make collector except being transferred cold-producing medium mobile in liquid refrigerant pipe 27 mode being connected with gas refrigerant pipe 28 collector communicating pipe communicating pipe make transfer valve 80 actions, can carry out the heating and defrosting running identical with above-mentioned embodiment or variation 1.

In addition, in the structure of this variation, compare with the structure of above-mentioned embodiment and variation 1 and the structure of variation 2～4, can reduce the part number that forms defrosting stream mechanism 26.

(variation 6)

Example as shown in FIG. 19 and 20, also can be used the transfer valve 81a～81c of branched pipe side heat exchange paths selector valve 73a～73c and the integrated rear formation of header sides heat exchange paths selector valve 74a～74c.Herein, transfer valve 81a～81c is the transfer valve with following functions: selection is that cold-producing medium mobile in heat exchange paths supply pipe 71 is carried towards liquid side from the gas side of heat exchange paths 31～33, or the cold-producing medium flowing through from liquid side vigor side end in heat exchange paths 31～33 via cold-producing medium isocon 64 is delivered to collector 66.As transfer valve 81a～81c, use triple valve herein.These transfer valves 81a～81c is connected with heat exchange paths branched pipe 72a～72c and collector communicating pipe 65a～65c.In addition, in the structure of this variation, in the control block diagram of Fig. 2, transfer valve 81a～81c is connected with control part 8, to replace branched pipe side heat exchange paths selector valve 73a～73c and header sides heat exchange selector valve 74a～74c.In addition, Figure 19 is the schematic configuration diagram of the aircondition 1 of this variation, and it means cold-producing medium in the aircondition 1 mobile figure when heating running.Figure 20 means the figure of cold-producing medium in the aircondition 1 of this variation flow (the carrying out the situation of the defrosting of the first heat exchange paths 31) when heating and defrosting turns round.

Even if in this structure, as shown in figure 19, by the cold-producing medium flowing through from liquid side vigor side end via cold-producing medium isocon 64 is delivered to the mode of collector 66 in heat exchange paths 31～33, transfer valve 81a～81c being moved, also can carry out the heat running identical with above-mentioned embodiment.In addition, also can with heat under the operating state of identical transfer valve 81a～81c of when running, carry out the cooling operation identical with above-mentioned embodiment.In addition, as shown in figure 20, by the mode so that cold-producing medium mobile in heat exchange paths supply pipe 71 is carried towards liquid side from the gas side of heat exchange paths 31～33, the arbitrary transfer valve transfer valve 81a～81c is moved, and other transfer valves are moved the cold-producing medium flowing through from liquid side vigor side end via cold-producing medium isocon 64 is delivered to the mode of collector 66 in heat exchange paths 31～33, can carry out the heating and defrosting running identical with above-mentioned embodiment or variation 1.

< the second embodiment >

In above-mentioned the first embodiment and variation thereof, the structure of heating and defrosting running of the present invention is applicable to have the outdoor heat converter 23 of a plurality of heat exchange paths 31～33 that connect side by side each other, but is not limited thereto., also the structure of heating and defrosting running of the present invention can be applicable to not only have a plurality of heat exchange paths 31～33 herein, also have for cold-producing medium at the outdoor heat converter 123 that flows into the supercooling path 34 flowing through before coolant flow divider 64.

Figure 21 is the schematic configuration diagram of the aircondition 101 of second embodiment of the invention.Aircondition 101 mainly has: outdoor unit 102; Indoor unit 4; And the liquid refrigerant communicating pipe 5 that outdoor unit 102 is connected with indoor unit 4 and gas refrigerant communicating pipe 6.In addition, outdoor unit 102 and indoor unit 4 are configured for carrying out the refrigerant loop 110 of the kind of refrigeration cycle of steam compression type via linking together liquid refrigerant communicating pipe 5 and gas refrigerant communicating pipe 6.

(indoor unit)

Indoor unit 4 is arranged at indoor, has formed a part for refrigerant loop 110.Indoor unit 4 mainly has indoor heat converter 41.In addition, the structure of indoor unit 4 is identical with the structure of the indoor unit 4 of the first embodiment, and therefore, description thereof is omitted herein.

(outdoor unit)

Outdoor unit 102 is arranged at outdoor, has formed a part for refrigerant loop 110.Outdoor unit 102 mainly has: compressor 21; Four-way switching valve 22; Outdoor heat converter 123; Expansion valve 24; Outdoor fan 25; And defrosting stream mechanism 126.In addition, except the structure of outdoor heat converter 123 and defrosting stream mechanism 126, the structure of outdoor unit 102 is identical with the structure of the outdoor unit 2 of the first embodiment, therefore, herein, the structure of outdoor heat converter portion 123 and defrosting stream mechanism 126 is elaborated.

Outdoor heat converter 123 is the heat exchangers that work as the radiator of cold-producing medium when cooling operation and work as the evaporimeter of cold-producing medium when heating running.As outdoor heat converter 123, adopted the finned fin-tube heat exchanger of intersection being formed by heat pipe and a plurality of fin herein.The hydraulic fluid side of outdoor heat converter 123 is connected with expansion valve 24 via liquid refrigerant pipe 27, and gas side is connected with four-way switching valve 22 via gas refrigerant pipe 28.

More specifically, outdoor heat converter 123 is identical with the outdoor heat converter 23 of the first embodiment, and it has: a plurality of fins 61; And a plurality of heat pipes 62 (with reference to Fig. 2) of installing under the state that these fins 61 are run through in thickness of slab direction.As shown in figure 22, in this outdoor heat converter 123, heat pipe 61 is divided into a plurality of (being four herein) system along the vertical direction, and formation makes these systems separate the first heat exchange paths 31, the second heat exchange paths 32, the 3rd heat exchange paths 33 and the shared supercooling path 34 of the first heat exchange paths 31～three heat exchange paths 33.Herein, Figure 22 is the figure that schematically illustrates outdoor heat converter 123 and near structure thereof.In addition, the liquid side of the first heat exchange paths 31～three heat exchange paths 33 is connected with coolant flow divider 64 via the first capillary 63a～the three capillary 63c respectively.Coolant flow divider 64 is the pipe components at the first capillary 63a～the three capillary 63c interflow of making to be connected with the liquid side of the first heat exchange paths 31～three heat exchange paths 33, and this coolant flow divider 64 was connected with supercooling path-heat exchange paths communicating pipe 35.The gas side of the first heat exchange paths 31～three heat exchange paths 33 is connected with collector 66 via the first collector communicating pipe 65a～three collector communicating pipe 65c respectively.Collector 66 is the pipe components at the first collector communicating pipe 65a～three collector communicating pipe 65c interflow of making to be connected with the gas side of the first heat exchange paths 31～three heat exchange paths 33, and this collector 66 is connected with gas refrigerant pipe 28.Supercooling path 34 is jointly connected with the liquid side of the first heat exchange paths 31～three heat exchange paths 33.The liquid side of supercooling path 34 is connected with liquid refrigerant pipe 27.The gas side of supercooling path 34 was connected with supercooling path-heat exchange paths communicating pipe 35.Like this, a plurality of (being three the herein) heat exchange paths 31～33 that forms outdoor heat converter 123 links together each other side by side via coolant flow divider 64 and collector 66.In addition, the supercooling path 34 that forms outdoor heat converter 123 was connected with the liquid side of heat exchange paths 31～33 via coolant flow divider 64 and supercooling path-heat exchange paths communicating pipe 35.In addition, when cooling operation, all heat exchange paths 31～33 work as the radiator of cold-producing medium, and supercooling path 34 works as the subcooler of the cold-producing medium after dispelling the heat in heat exchange paths 31～33.In addition, when heating running, supercooling path 34 works as the radiator of the cold-producing medium under the middle pressure condition flowing through after expansion valve 24, with prevent outdoor heat converter 123 foot frost, all heat exchange paths 31～33 work as the evaporimeter of cold-producing medium.

Defrosting stream mechanism 126 is for making the cold-producing medium that is delivered to outdoor heat converter 123 from indoor heat converter 41 not flow into coolant flow divider 64 after flowing through supercooling path 34, but is delivered to the mechanism of the gas side of the heat exchange paths of selecting arbitrarily in a plurality of heat exchange paths 31～33.This defrosting stream mechanism 126 is set as for carrying out the running of aftermentioned heating and defrosting.This heating and defrosting running is on one side any heat exchange paths in the heat exchange paths 31～33 of formation outdoor heat converter 123 to be defrosted, Yi Bian make to be delivered to from outdoor heat converter 41 running of the cold-producing medium evaporation of outdoor heat converter 23.Defrosting stream mechanism 126 mainly has: heat exchange paths supply pipe 71; Many (being three herein) heat exchange paths branched pipe 72a～72c; Many (being three herein) branched pipe side heat exchange paths selector valve 73a～73c; Many (being three herein) header sides heat exchange paths selector valve 74a～74c; And isocon side selector valve 75.

Heat exchange paths supply pipe 71 be for by the cold-producing medium that is delivered to outdoor heat converter 23 from indoor heat converter 41 after flowing through supercooling path 34 and before flowing into coolant flow divider 64, from the refrigerant pipe of supercooling path-heat exchange paths communicating pipes 35 branch.One end of heat exchange paths supply pipe 71 is connected with the part between coolant flow divider 64 with the gas side at supercooling path 34 in supercooling path-heat exchange paths communicating pipe 35, and the other end is connected with heat exchange paths branched pipe 72a～72c.

Whether isocon side selector valve 75 is for selecting the cold-producing medium that is delivered to outdoor heat converter 23 from indoor heat converter 41 after flowing through supercooling path 34 and before flowing into coolant flow divider 64, from the magnetic valve of supercooling path-heat exchange paths communicating pipes 35 branch.Isocon side selector valve 75 is located at positions in supercooling path-heat exchange paths communicating pipe 35 and heat exchange paths supply pipe 71 branches and the part between coolant flow divider 64.In addition,, when cooling operation and while heating running, open isocon side selector valve 75.In addition, when heating and defrosting turns round, close isocon side selector valve 75.

(action)

Then, to thering is the action of the aircondition 101 of said structure, describe.In addition, in order to carry out the control of the required various device of following action, various processing etc., carry out with the identical control part 8 that utilizes of aircondition 1 of the first embodiment.

As the running of aircondition 101, the heating and defrosting that exists the defrosting that heats running and carry out outdoor heat converter 23 carry out the cooling operation of indoor refrigeration, only to carry out indoor heating to carry out indoor heating on one side turns round.Below, use Figure 23, Fig. 6, Figure 24 and Figure 25, action when each is turned round describes.Herein, Figure 23 means the mobile figure of aircondition 101 inner refrigerants while heating running.The figure of the flow of refrigerant (carrying out the situation of the defrosting of the first heat exchange paths 31) in the aircondition 101 when Figure 24 means heating and defrosting running.Figure 25 is pressure-enthalpy line chart of the kind of refrigeration cycle while illustrating heating and defrosting running.

-cooling operation-

Cooling operation is to make the cold-producing medium running of circulation in compressor 21, outdoor heat converter 123, indoor heat converter 41, compressor 21 successively.In this cooling operation, outdoor heat converter 123 works as the radiator of cold-producing medium, and indoor heat converter 41 works as the evaporimeter of cold-producing medium, by this, to room air, carries out cooling.

In cooling operation, switch four-way switching valve 22, using and form that outdoor heat converter 123 works as the radiator of cold-producing medium and state (being the state representing with solid line of the four-way switching valve 22 of Figure 21) that indoor heat converter 41 works as the evaporimeter of cold-producing medium.In addition, the first branched pipe side heat exchange paths selector valve 73a～three branched pipe side heat exchange paths selector valve 73c is closed, the first header sides heat exchange paths selector valve 74a～three header sides heat exchange paths selector valve 74c is opened, the state of isocon side selector valve 75 in being opened.That is, in the heat exchange paths supply pipe 71 and the first heat exchange paths branched pipe 72a～three heat exchange paths branched pipe 72c of defrosting stream mechanism 126, in the immobilising state of cold-producing medium.

In the refrigerant loop 110 of this state, the low pressure refrigerant in kind of refrigeration cycle is inhaled into compressor 21, and is discharged from after the high pressure in being compressed to kind of refrigeration cycle.High-pressure refrigerant from compressor 21 is discharged is transported to outdoor heat converter 123 via four-way switching valve 22.The high-pressure refrigerant of then, discharging from compressor 21 is transported to the gas side of the heat exchange paths 31～33 of outdoor heat converter 123 via four-way switching valve 22, gas refrigerant pipe 28, collector 66, collector communicating pipe 65a～65c and header sides heat exchange paths selector valve 74a～74c.Subsequently, the high-pressure refrigerant that is transported to the gas side of heat exchange paths 31～33 carries out heat exchange and dispels the heat with the outdoor air being come by outdoor fan 25 supplies in heat exchange paths 31～33.Then, in heat exchange paths 31～33, the high-pressure refrigerant after heat radiation is delivered to the gas side of the supercooling path 34 of outdoor heat converter 123 from the liquid side of heat exchange paths 31～33 via capillary 63a～63c, coolant flow divider 64, supercooling path-heat exchange paths communicating pipe 35 and isocon side selector valve 75.Subsequently, the high-pressure refrigerant that is transported to the gas side of supercooling path 34 carries out heat exchange and further heat radiation with the outdoor air being come by outdoor fan 25 supplies in supercooling path 34.Then, in supercooling path 34, the high-pressure refrigerant after supercooling is transported to expansion valve 24 via liquid refrigerant pipe 27.The cold-producing medium that is transported to expansion valve 24 is depressurized to the low pressure in kind of refrigeration cycle.In expansion valve 24, post-decompression low pressure refrigerant is transported to indoor heat converter 41 via hydraulic fluid side communicating pipe 5.The low pressure refrigerant that is transported to indoor heat converter 41 carries out heat exchange with room air and evaporates in indoor heat converter 41.Low pressure refrigerant in indoor heat converter 41 after evaporation is sucked compressor 21 again via gas refrigerant communicating pipe 6 and four-way switching valve 22.

-heat running-

Heating running is to make the cold-producing medium running of circulation in compressor 21, indoor heat converter 41, outdoor heat converter 123, compressor 21 successively.At this, heat in running, indoor heat converter 41 works as the radiator of cold-producing medium, and outdoor heat converter 123 works as the evaporimeter of cold-producing medium, by this, room air is heated.

In heating running, switch four-way switching valve 22, using and form that indoor heat converter 41 works as the radiator of cold-producing medium and state (being the state dotting of the four-way switching valve 22 of Figure 21 and Figure 23) that outdoor heat converter 123 works as the evaporimeter of cold-producing medium.In addition, the first branched pipe side heat exchange paths selector valve 73a～three branched pipe side heat exchange paths selector valve 73c is closed, the first header sides heat exchange paths selector valve 74a～three header sides heat exchange paths selector valve 74c is opened, the state of isocon side selector valve 75 in being opened.That is, in the heat exchange paths supply pipe 71 and the first heat exchange paths branched pipe 72a～three heat exchange paths branched pipe 72c of defrosting stream mechanism 126, in the immobilising state of cold-producing medium.

In the refrigerant loop 110 of this state, the low pressure refrigerant in kind of refrigeration cycle is inhaled into compressor 21, and is discharged from after the high pressure in being compressed to kind of refrigeration cycle.High-pressure refrigerant from compressor 21 is discharged is transported to indoor heat converter 41 via four-way switching valve 22 and via gas refrigerant communicating pipe 6.The high-pressure refrigerant that is transported to indoor heat converter 41 carries out heat exchange with room air and dispels the heat in indoor heat converter 41.High-pressure refrigerant in indoor heat converter 41 after heat radiation is transported to expansion valve 24 via liquid refrigerant communicating pipe 5, and is depressurized to middle pressure the in kind of refrigeration cycle.In the middle of post-decompression in expansion valve 24, compression refrigerant is transported to outdoor heat converter 123.Then, the middle compression refrigerant after being depressurized in expansion valve 24 is transported to the liquid side of the supercooling path 34 of outdoor heat converter 123 via liquid refrigerant pipe 27.Subsequently, the middle compression refrigerant of liquid side that is delivered to supercooling path 34 in supercooling path 34 with by outdoor fan 25, supply with the outdoor air coming and carry out heat exchange and dispel the heat, by this, prevent outdoor heat converter 123 foot frost.Then, in supercooling path 34, the low pressure refrigerant after heat radiation is delivered to the liquid side of the heat exchange paths 31～33 of outdoor heat converter 23 from the gas side of supercooling path 34 via supercooling path-heat exchange paths communicating pipe 35, isocon side selector valve 75, coolant flow divider 64 and capillary 63a～63c.Subsequently, the low pressure refrigerant that is transported to the liquid side of heat exchange paths 31～33 carries out heat exchange and evaporates with the outdoor air being come by outdoor fan 25 supplies in heat exchange paths 31～33.Then, in heat exchange paths 31～33, the low pressure refrigerant after evaporation is sucked compressor 21 from the gas side of heat exchange paths 31～33 again via collector communicating pipe 65a～65c, header sides heat exchange paths selector valve 74a～74c, collector 66, gas refrigerant pipe 28 and four-way switching valve 22.

-heating and defrosting running-

Heating and defrosting running is to make in the same manner the cold-producing medium running of circulation in compressor 21, indoor heat converter 41, outdoor heat converter 123, compressor 21 successively when heating running on one side, Yi Bian the running that utilizes 126 pairs of outdoor heat converters 123 of defrosting stream mechanism to defrost.In this heating and defrosting running, indoor heat converter 41 works as the radiator of cold-producing medium, and any one heat exchange paths in the first heat exchange paths 31～three heat exchange paths 33 of outdoor heat converter 123 works as the radiator of cold-producing medium, and remaining heat exchange paths 31～33 works as the evaporimeter of cold-producing medium.By this, Yi Bian carry out the defrosting of the first heat exchange paths 31～33 of outdoor heat converter 123, Yi Bian room air is heated.

The switching state of the four-way switching valve 22 in heating and defrosting running with heat while turning round identical.; the state (that is, the state dotting of the four-way switching valve 22 of Figure 21 and Figure 24) that four-way switching valve 22 works as the radiator of cold-producing medium in indoor heat converter 41 and outdoor heat converter 123 works as the evaporimeter of cold-producing medium.In addition, in order to carry out successively the defrosting of the first heat exchange paths 31～three heat exchange paths 33 of outdoor heat converter 123, when selector valve 73a～73c, 74a～74c, 75 are switched to from cooling operation and heat when running different open closed condition.That is, in heating and defrosting running, in the heat exchange paths supply pipe 71 of defrosting stream mechanism 126 and the first heat exchange paths branched pipe 72a～three heat exchange paths branched pipe 72c, the state in flow of refrigerant.Below, also comprise that action when interiorly heating and defrosting is turned round from the beginning of heating and defrosting running to the step till finishing is elaborated.

First, in step S1, because heating running, frosting degree in outdoor heat converter 123 is increased, thereby judge whether needing to defrost.In addition, the judgement whether this defrosting is necessary is identical with the step S1 of the heating and defrosting running of the first embodiment, and therefore, description thereof is omitted herein.

Then,, in step S2～S7, carry out successively the defrosting of the first heat exchange paths 31～three heat exchange paths 33 of outdoor heat converter 123.In addition, substantially also can at random select the defrosting of the first heat exchange paths 31～three heat exchange paths 33, but when considering the drain water producing because of defrosting to be expelled to base plate 52 mobile of unit housings 51, from the top of outdoor heat converter 123, towards bottom, be comparatively desirable.Therefore,, according to the order of the first heat exchange paths 31, the second heat exchange paths 32, the 3rd heat exchange paths 33, defrost herein.

defrosting stream mechanism

126,75 the closed condition of opening are carried out.Particularly, switch to following state: open the first branched pipe side heat exchange paths selector valve 73a, close the second branched pipe side heat exchange

paths selector valve

73b, 73c, close the first header sides heat exchange paths selector valve 74a, open the second header sides heat exchange paths selector valve 74b, the 3rd header sides heat exchange paths selector valve 74c, close isocon side selector valve 75.In addition,, heat running until before the beginning of the defrosting of the first heat exchange paths 31 herein, therefore, carry out following switching action: open the first branched pipe side heat exchange paths selector valve 73a, close the first header sides heat exchange paths selector valve 74a, close isocon side selector valve 75.By this, heat exchange paths supply pipe 71 and the mobile state of the first heat exchange paths branched pipe 72a towards defrosting stream mechanism 126 in cold-producing medium.

In the refrigerant loop 110 of this state, the cold-producing medium of the low pressure in kind of refrigeration cycle (with reference to the some A of Figure 24 and Figure 25) is inhaled into compressor 21, and is discharged from (with reference to the some B of Figure 24 and Figure 25) after the high pressure in being compressed to kind of refrigeration cycle.High-pressure refrigerant from compressor 21 is discharged is transported to indoor heat converter 41 via four-way switching valve 22 and via gas refrigerant communicating pipe 6.The high-pressure refrigerant that is delivered to indoor heat converter 41 carries out heat exchange and dispel the heat (with reference to the some C of Figure 24 and Figure 25) with room air in indoor heat converter 41.Hereto, with to heat when running identical.High-pressure refrigerant in indoor heat converter 41 after heat radiation is transported to expansion valve 24 via liquid refrigerant communicating pipe 5, and is depressurized as the high pressure in kind of refrigeration cycle and the pressure between low pressure (pressing hereinafter referred to as centre) (with reference to the some D of Figure 24 and Figure 25).In the middle of post-decompression in expansion valve 24, compression refrigerant is transported to outdoor heat converter 123.Then, the middle compression refrigerant after being depressurized in expansion valve 24 is transported to the liquid side of the supercooling path 34 of outdoor heat converter 123 from liquid refrigerant pipe 27.Then, be delivered to the distolateral middle compression refrigerant of the liquid of supercooling path 34 heats the drain water melting because of the defrosting of the first heat exchange paths 31 and run underneath to the foot of outdoor heat converter 123 in supercooling path 34, the temperature that by this, can prevent the base plate 52 because working as drain pan is freezed (with reference to the some D ' of Figure 24 and Figure 25) again compared with the low drain water that makes.By this, prevent drain water freezing again in the supercooling path 34 of outdoor heat converter 123.Then, the middle compression refrigerant that flows through supercooling path 34 is transported to heat exchange paths supply pipe 71 from the gas side of supercooling path 34 via supercooling path-heat exchange paths communicating pipe 35.In addition the middle compression refrigerant that, is delivered to heat exchange paths supply pipe 71 is via the first heat exchange paths branched pipe 72a, the first branched pipe side heat exchange paths selector valve 73a and the first collector communicating pipe 65a and be transported to the gas side of the first heat exchange paths 31 of outdoor heat converter 123.Like this, the cold-producing medium that is delivered to outdoor heat converter 123 from indoor heat converter 41 does not flow into coolant flow divider 64, but is all transported to the gas side of the first heat exchange paths 31.In addition, the middle compression refrigerant that is delivered to the gas side of the first heat exchange paths 31 flows through in the first heat exchange paths 31 towards liquid side from the gas side of the first heat exchange paths 31, so that be attached to the frost of the first heat exchange paths 31 of outdoor heat converter 123, melts (with reference to the some E of Figure 24 and Figure 25).By this, carry out the defrosting of the first heat exchange paths 31 of outdoor heat converter 23.Then, the middle compression refrigerant that flows through the first heat exchange paths 31 is transported to coolant flow divider 64 from the liquid side of the first heat exchange paths 31 via the first capillary 63a.Now, in the first capillary 63a, during with cooling operation, heat when running and compare and have middle the compression refrigerant that flow is larger mobile, therefore, during with cooling operation, the situation that heats when running flow of refrigerant compares, it is large that the pressure loss becomes, and is depressurized to the middle pressure (with reference to the some F of Figure 24 and Figure 25) of pressing between (being the pressure of the some E of Figure 24 and Figure 25) and low pressure in kind of refrigeration cycle.In addition, owing to closing isocon side selector valve 75, therefore, the low pressure refrigerant that is delivered to coolant flow divider 64 flows through in coolant flow divider 64 in the mode of turning back and branches to the second capillary 63b and three capillary 63c, and is transported to the liquid side of the second heat exchange paths 32 and the 3rd heat exchange paths 33.Now, cold-producing medium flows through the second capillary 63b and three capillary 63c and is depressurized to the low pressure (with reference to the some G of Figure 24 and Figure 25) in kind of refrigeration cycle.In addition, the low pressure refrigerant that is transported to the liquid side of the second heat exchange paths 32 and the 3rd heat exchange paths 33 flows through in the second heat exchange paths 32 and the 3rd heat exchange paths 33 from the liquid side vigor side end of the second heat exchange paths 32 and the 3rd heat exchange paths 33, and carries out heat exchange and evaporate (with reference to the some A of Figure 24 and Figure 25) with the outdoor air being come by outdoor fan 25 supplies.Then, in the second heat exchange paths 32, the 3rd heat exchange paths 33, the low pressure refrigerant after evaporation is inhaled into compressor 21 via second, third collector communicating pipe 65b, 65c, the second header sides heat exchange paths selector valve 74b, the 3rd header sides heat exchange paths selector valve 74c, collector 66, gas refrigerant pipe 28 and four-way switching valve 22 again from the gas side of the second heat exchange paths 32, the 3rd heat exchange paths 33.Like this, continue indoor heating, and start the defrosting of the first heat exchange paths 31.Then, carry out the defrosting of the first heat exchange paths 31 until the defrosting of the first heat exchange paths 31 finishes (step S3).

defrosting stream mechanism

126,75 the closed condition of opening, to be undertaken in the same manner with the first heat exchange paths 31.Particularly, switch to following state: open the second branched pipe side heat exchange paths selector valve 73b, close the first, the 3rd branched pipe side heat exchange

paths selector valve

74a, 74c, close isocon side selector valve 75.In addition, herein, carry out the defrosting of the first heat exchange paths 31 until before the defrosting of the second heat exchange paths 32 starts, therefore, carry out following switching action, open the second branched pipe side heat exchange paths selector valve 73b, close the first branched pipe side heat exchange paths selector valve 73a, open the first header sides heat exchange paths selector valve 74a, and close the second header sides heat exchange paths selector valve 74b.By this, heat exchange paths supply pipe 71 and the mobile state of the second heat exchange paths branched pipe 72b towards defrosting stream mechanism 126 in cold-producing medium.

In the refrigerant loop 110 of this state, identical during the defrosting of the low pressure refrigerant in kind of refrigeration cycle and the first heat exchange paths 31, in compressor 21, be compressed into the high pressure in kind of refrigeration cycle, in indoor heat converter 41, carry out heat exchange with room air and dispel the heat, and in expansion valve 24, be depressurized in kind of refrigeration cycle in the middle of press and be transported to outdoor heat converter 123.Then, the middle compression refrigerant after being depressurized in expansion valve 24 is transported to the liquid side of the supercooling path 34 of outdoor heat converter 123 from liquid refrigerant pipe 27.Then, be delivered to the distolateral middle compression refrigerant of the liquid of supercooling path 34 heats the drain water melting because of the defrosting of the second heat exchange paths 32 and run underneath to the foot of outdoor heat converter 123 in supercooling path 34, the temperature that by this, can prevent the base plate 52 because working as drain pan is freezed compared with the low drain water that makes again.By this, prevent drain water freezing again in the supercooling path 34 of outdoor heat converter 123.Then, the middle compression refrigerant that flows through supercooling path 34 is transported to heat exchange paths supply pipe 71 from the gas side of supercooling path 34 via supercooling path-heat exchange paths communicating pipe 35.In addition the middle compression refrigerant that, is delivered to heat exchange paths supply pipe 71 is via the second heat exchange paths branched pipe 72b, the second branched pipe side heat exchange paths selector valve 73b and the second collector communicating pipe 65b and be transported to the gas side of the second heat exchange paths 32 of outdoor heat converter 123.Like this, the cold-producing medium that is delivered to outdoor heat converter 123 from indoor heat converter 41 does not flow into coolant flow divider 64, but is all transported to the gas side of the second heat exchange paths 32.In addition, the middle compression refrigerant that is delivered to the gas side of the second heat exchange paths 32 flows through in the second heat exchange paths 32 towards liquid side from the gas side of the second heat exchange paths 32, so that be attached to the frost of the second heat exchange paths 32 of outdoor heat converter 123, melts.By this, carry out the defrosting of the second heat exchange paths 32 of outdoor heat converter 123.Then, the middle compression refrigerant that flows through the second heat exchange paths 32 is transported to coolant flow divider 64 from the liquid side of the second heat exchange paths 32 via the second capillary 63b.Now, in the second capillary 63b, during with cooling operation, heat when running and compare and have middle the compression refrigerant that flow is larger mobile, therefore, during with cooling operation, the situation that heats when running flow of refrigerant compares, it is large that the pressure loss becomes, be depressurized in kind of refrigeration cycle in the middle of press and low pressure between pressure.In addition, owing to closing isocon side selector valve 75, therefore, the low pressure refrigerant that is delivered to coolant flow divider 64 flows through in coolant flow divider 64 in the mode of turning back and branches to the first capillary 63a and three capillary 63c, and is transported to the liquid side of the first heat exchange paths 31 and the 3rd heat exchange paths 33.Now, cold-producing medium flows through the first capillary 63a and three capillary 63c and is depressurized to the low pressure in kind of refrigeration cycle.In addition, the low pressure refrigerant that is transported to the liquid side of the first heat exchange paths 31 and the 3rd heat exchange paths 33 flows through in the first heat exchange paths 31 and the 3rd heat exchange paths 33 from the liquid side vigor side end of the first heat exchange paths 31 and the 3rd heat exchange paths 33, and carries out heat exchange and evaporate with the outdoor air being come by outdoor fan 25 supplies.Then, in the first heat exchange paths 31, the 3rd heat exchange paths 33, the low pressure refrigerant after evaporation is inhaled into compressor 21 via the first, the 3rd collector communicating pipe 65a, 65c, first, the 3rd header sides heat exchange paths selector valve 74a, 74c, collector 66, gas refrigerant pipe 28 and four-way switching valve 22 again from the gas side of the first heat exchange paths 31, the 3rd heat exchange paths 33.Like this, continue indoor heating, and start the defrosting of the second heat exchange paths 32.Then, carry out the defrosting of the second heat exchange paths 32 until the defrosting of the second heat exchange paths 32 finishes (step S5).

defrosting stream mechanism

126,75 the closed condition of opening, to be undertaken in the same manner with the first heat exchange paths 31, the second heat exchange paths 32.Particularly, switch to following state: open the 3rd branched pipe side heat exchange paths selector valve 73c, close first, second branched pipe side heat exchange

paths selector valve

74a, 74b, close isocon side selector valve 75.In addition, herein, carry out the defrosting of the second heat exchange paths 32 until before the defrosting of the 3rd heat exchange paths 33 starts, therefore, carry out following switching action, open the 3rd branched pipe side heat exchange paths selector valve 73c, close the second branched pipe side heat exchange paths selector valve 73b, open the second header sides heat exchange paths selector valve 74b, and close the 3rd header sides heat exchange paths selector valve 74c.By this, heat exchange paths supply pipe 71 and the mobile state of the 3rd heat exchange paths branched pipe 72c towards defrosting stream mechanism 126 in cold-producing medium.

In the refrigerant loop 110 of this state, identical during the defrosting of the low pressure refrigerant in kind of refrigeration cycle and first, second heat exchange paths 31,32, in compressor 21, be compressed into the high pressure in kind of refrigeration cycle, in indoor heat converter 41, carry out heat exchange with room air and dispel the heat, and in expansion valve 24, be depressurized in kind of refrigeration cycle in the middle of press and be transported to outdoor heat converter 123.Then, the middle compression refrigerant after being depressurized in expansion valve 24 is transported to the liquid side of the supercooling path 34 of outdoor heat converter 123 from liquid refrigerant pipe 27.Then, be delivered to the distolateral middle compression refrigerant of the liquid of supercooling path 34 heats the drain water melting because of the defrosting of the second heat exchange paths 33 and run underneath to the foot of outdoor heat converter 123 in supercooling path 34, the temperature that by this, can prevent the base plate 52 because working as drain pan is freezed compared with the low drain water that makes again.By this, prevent drain water freezing again in the supercooling path 34 of outdoor heat converter 123.Then, the middle compression refrigerant that flows through supercooling path 34 is transported to heat exchange paths supply pipe 71 from the gas side of supercooling path 34 via supercooling path-heat exchange paths communicating pipe 35.In addition the middle compression refrigerant that, is delivered to heat exchange paths supply pipe 71 is via the 3rd heat exchange paths branched pipe 72c, the 3rd branched pipe side heat exchange paths selector valve 73c and the 3rd collector communicating pipe 65c and be transported to the gas side of the 3rd heat exchange paths 33 of outdoor heat converter 23.Like this, the cold-producing medium that is delivered to outdoor heat converter 23 from indoor heat converter 41 does not flow into coolant flow divider 64, but is all transported to the gas side of the 3rd heat exchange paths 33.In addition, the middle compression refrigerant that is delivered to the gas side of the 3rd heat exchange paths 33 flows through in the 3rd heat exchange paths 33 towards liquid side from the gas side of the 3rd heat exchange paths 33, so that be attached to the frost of the 3rd heat exchange paths 33 of outdoor heat converter 123, melts.By this, carry out the defrosting of the 3rd heat exchange paths 33 of outdoor heat converter 123.Then, the middle compression refrigerant that flows through the 3rd heat exchange paths 33 is transported to coolant flow divider 64 from the liquid side of the 3rd heat exchange paths 33 via three capillary 63c.Now, in three capillary 63c, during with cooling operation, heat when running and compare and have middle the compression refrigerant that flow is larger mobile, therefore, during with cooling operation, the situation that heats when running flow of refrigerant compares, it is large that the pressure loss becomes, be depressurized in kind of refrigeration cycle in the middle of press and low pressure between pressure.In addition, owing to closing isocon side selector valve 75, therefore, the low pressure refrigerant that is delivered to coolant flow divider 64 flows through in coolant flow divider 64 in the mode of turning back and branches to the first capillary 63a and the second capillary 63b, and is transported to the liquid side of the first heat exchange paths 31 and the 3rd heat exchange paths 32.Now, cold-producing medium flows through the first capillary 63a and the second capillary 63b and is depressurized to the low pressure in kind of refrigeration cycle.In addition, the low pressure refrigerant that is transported to the liquid side of the first heat exchange paths 31 and the second heat exchange paths 32 flows through in the first heat exchange paths 31 and the second heat exchange paths 32 from the liquid side vigor side end of the first heat exchange paths 31 and the second heat exchange paths 32, and carries out heat exchange and evaporate with the outdoor air being come by outdoor fan 25 supplies.Then, in the first heat exchange paths 31, the second heat exchange paths 32, the low pressure refrigerant after evaporation is inhaled into compressor 21 via first, second collector communicating pipe 65a, 65b, first, second header sides heat exchange paths selector valve 74a, 74b, collector 66, gas refrigerant pipe 28 and four-way switching valve 22 again from the gas side of the first heat exchange paths 31, the second heat exchange paths 32.Like this, continue indoor heating, and start the defrosting of the 3rd heat exchange paths 33.Then, carry out the defrosting of the 3rd heat exchange paths 33 until the defrosting of the second heat exchange paths 33 finishes (step S7).

In addition, in the processing by above-mentioned steps S2～S7, make after the defrosting of all heat exchange paths 31～33 of outdoor heat converter 123 finishes, to return back to and heat running (step S8).

As mentioned above, carry out following heating and defrosting running: utilize defrosting stream mechanism 126, on one side any heat exchange paths in heat exchange paths 31～33 is defrosted, make to be delivered to from indoor heat converter 41 the cold-producing medium evaporation of outdoor heat converter 23 on one side.In addition, by successively a plurality of heat exchange paths 31～33 being carried out to this heating and defrosting running, Yi Bian continue indoor heating, Yi Bian outdoor heat converter 123 integral body are defrosted.And, also can in this heating and defrosting running, make cold-producing medium flow through supercooling path 34, therefore, the drain water melting because of the defrosting of heat exchange paths 31～33 and run underneath to the foot of outdoor heat converter 123 is heated, the temperature that by this, can prevent the base plate 52 because working as drain pan is freezed compared with the low drain water that makes again.

(feature)

In the aircondition 101 of present embodiment, identical with the aircondition 1 of the first embodiment, whole flows of the cold-producing medium after compressed in compressor 21 can be delivered to indoor heat converter 41 for heating (with reference to Figure 24 and Figure 25 from a B to the stroke of putting till C), then, utilize the heat that is delivered to the cold-producing medium of outdoor heat converter 23 from indoor heat converter 41 defrost (with reference to Figure 24 and Figure 25 from a D to the stroke of putting till E).Therefore, in the heating and defrosting running of aircondition 101, make hardly heating capacity reduce, just can carry out the defrosting of outdoor heat converter 123.

And, in aircondition 101, also can in heating and defrosting running, make cold-producing medium flow through supercooling path 34, therefore, can prevent freezing again of drain water that the defrosting because of heat exchange paths 31～33 produces, and can carry out rapidly draining from the bottom of outdoor heat converter 123.

(variation 1)

In the heating and defrosting running of above-mentioned embodiment, also can carry out the heating and defrosting running identical with the variation 1 (with reference to Figure 10) of the first embodiment.

(variation 2)

In the aircondition 101 of above-mentioned embodiment and variation 1, defrosting stream mechanism 126 consists of heat exchange paths supply pipe 71, heat exchange paths branched pipe 72a～72c, branched pipe side heat exchange selector valve 73a～73c, header sides heat exchange selector valve 74a～74c and isocon side selector valve 75, but is not limited thereto.

For example, shown in Figure 26 and Figure 27, also can use the transfer valve 82 of heat exchange paths branched pipe 72a～72c, branched pipe side heat exchange paths selector valve 73a～73c, header sides heat exchange paths selector valve 74a～74c and collector 66 integrated rear formation.Herein, transfer valve 82 is the transfer valves with following functions: select cold-producing medium mobile in heat exchange paths supply pipe 71 to be delivered to which in collector communicating pipe 65a～65c collector communicating pipe, and selecting is by except being transferred collector being connected with gas refrigerant pipe 28 collector communicating pipe communicating pipe of cold-producing medium mobile in heat exchange paths supply pipe 71, still towards the equal refrigerant conveying not of arbitrary collector communicating pipe 65a～65c.Used revolving switch valve to using as transfer valve 82 herein.This transfer valve 82 is connected with heat exchange paths supply pipe 71, collector communicating pipe 65a～65c and gas refrigerant pipe 28.In addition, in the structure of this variation, in the control block diagram of Fig. 2, transfer valve 82 is connected with control part 8, to replace branched pipe side heat exchange paths selector valve 73a～73c and header sides heat exchange selector valve 74a～74c.In addition, Figure 26 is the schematic configuration diagram of the aircondition 101 of this variation, and it means cold-producing medium in the aircondition 101 mobile figure when heating running.Figure 27 means the figure of cold-producing medium in the aircondition 101 of this variation flow (the carrying out the situation of the defrosting of the first heat exchange paths 31) when heating and defrosting turns round.

Even if in this structure, as shown in figure 26, by with towards arbitrary collector communicating pipe 65a～65c all not the mode of refrigerant conveying make transfer valve 82 action, also can carry out the heat running identical with above-mentioned embodiment.In addition, also can with heat under the operating state of identical transfer valve 82 of when running, carry out the cooling operation identical with above-mentioned embodiment.In addition, as shown in figure 27, by to select that cold-producing medium mobile in heat exchange paths supply pipe 71 is delivered to which in collector communicating pipe 65a～65c collector communicating pipe, and make collector except being transferred cold-producing medium mobile in heat exchange paths supply pipe 71 mode being connected with gas refrigerant pipe 28 collector communicating pipe communicating pipe make transfer valve 82 actions, can carry out the heating and defrosting running identical with above-mentioned embodiment or variation 1.

In addition, in the structure of this variation, compare with the structure of above-mentioned embodiment and variation 1, can reduce the part number that forms defrosting stream mechanism 126.

(variation 3)

Example as shown in FIG. 28 and 29, also can be used the transfer valve 83 of heat exchange paths supply pipe 71, heat exchange paths branched pipe 72a～72c, branched pipe side heat exchange paths selector valve 73a～73c, header sides heat exchange paths selector valve 74a～74c, isocon side selector valve 75 and collector 66 integrated rear formation.Herein, transfer valve 83 is the transfer valves with following functions: selection is to make flow of refrigerant mobile in supercooling path-heat exchange paths communicating pipe 35 to cold-producing medium isocon 64, or this cold-producing medium is delivered to the arbitrary collector communicating pipe in collector communicating pipe 65a～65c, and makes except being transferred collector being connected with gas refrigerant pipe 28 collector communicating pipe communicating pipe of cold-producing medium mobile in supercooling path-heat exchange paths communicating pipe 35.Used revolving switch valve to using as transfer valve 83 herein.This transfer valve 83 is connected with supercooling path-heat exchange paths communicating pipe 35, cold-producing medium isocon 64, collector communicating pipe 65a～65c and gas refrigerant pipe 28.In addition, in the structure of this variation, in the control block diagram of Fig. 2, transfer valve 83 is connected with control part 8, to replace branched pipe side heat exchange paths selector valve 73a～73c, header sides heat exchange selector valve 74a～74c and isocon side selector valve 75.In addition, Figure 28 is the schematic configuration diagram of the aircondition 101 of this variation, and it means cold-producing medium in the aircondition 101 mobile figure when heating running.Figure 29 means the figure of cold-producing medium in the aircondition 101 of this variation flow (the carrying out the situation of the defrosting of the first heat exchange paths 31) when heating and defrosting turns round.

Even if in this structure, as shown in figure 28, by so that in supercooling path-heat exchange paths communicating pipe 35 mobile flow of refrigerant to the mode of cold-producing medium isocon 64 make transfer valve 83 actions, also can carry out the heat running identical with above-mentioned embodiment.In addition, also can with heat under the operating state of identical transfer valve 83 of when running, carry out the cooling operation identical with above-mentioned embodiment.In addition, as shown in figure 29, by to select that mobile cold-producing medium in supercooling path-heat exchange paths communicating pipe 35 is delivered to which in collector communicating pipe 65a～65c collector communicating pipe, and make collector except being transferred cold-producing medium mobile in liquid refrigerant pipe 27 mode being connected with gas refrigerant pipe 28 collector communicating pipe communicating pipe make transfer valve 83 actions, can carry out the heating and defrosting running identical with above-mentioned embodiment or variation 1.

In addition, in the structure of this variation, compare with the structure of above-mentioned embodiment and variation 1 and the structure of variation 2, can reduce the part number that forms defrosting stream mechanism 126.

(variation 4)

In the aircondition 101 of above-mentioned embodiment and variation 1, defrosting stream mechanism 126 is configured to and can makes the cold-producing medium that is delivered to outdoor heat converter 123 from indoor heat converter 41 after flowing through supercooling path 34, not flow into coolant flow divider 64, but is delivered to the gas side of the heat exchange paths of selecting arbitrarily in a plurality of heat exchange paths 31～33.Yet, in heating and defrosting running, in the situation that without making the cold-producing medium that is delivered to outdoor heat converter 123 from indoor heat converter 41 flow through supercooling path 34, also can form defrosting stream mechanism 126 can obtain with the turn round mode of identical flow of refrigerant of the heating and defrosting of the first embodiment.

For example, shown in Figure 30 and Figure 31, in the aircondition 101 of above-mentioned embodiment, also can make heat exchange paths supply pipe 71 from the position branch between the expansion valve 24 of liquid refrigerant pipe 27 and the liquid side of supercooling path 34, at heat exchange paths supply pipe 71, magnetic valve 76 is set.In addition,, in the structure of this variation, in the control block diagram of Fig. 2, transfer valve 76 is connected with control part 8 together with branched pipe side heat exchange paths selector valve 73a～73c, header sides heat exchange selector valve 74a～74c and isocon side selector valve 75.In addition, Figure 30 is the schematic configuration diagram of the aircondition 101 of this variation, and it means cold-producing medium in the aircondition 101 mobile figure when heating running.Figure 31 means the figure of cold-producing medium in the aircondition 101 of this variation flow (the carrying out the situation of the defrosting of the first heat exchange paths 31) when heating and defrosting turns round.

In such structure, as shown in figure 30, can carry out the heat running identical with above-mentioned embodiment by opening isocon side selector valve 75 and shut electromagnetic valve 76.In addition, also can with heat when running identical isocon side selector valve 75 and the operating state of magnetic valve 76 under carry out the cooling operation identical with above-mentioned embodiment.In addition, as shown in figure 31, by closing isocon side selector valve 75 and opening magnetic valve 76, do not make cold-producing medium flow through supercooling path 34, just can carry out the heating and defrosting running identical with the first embodiment.By this, can be by the heat of cold-producing medium only for the defrosting of heat exchange paths.

(variation 5)

In the aircondition 101 of above-mentioned variation 2, defrosting stream mechanism 126 is configured to and can makes the cold-producing medium that is delivered to outdoor heat converter 123 from indoor heat converter 41 after flowing through supercooling path 34, not flow into coolant flow divider 64, but is delivered to the gas side of the heat exchange paths of selecting arbitrarily in a plurality of heat exchange paths 31～33.Yet, in heating and defrosting running, in the situation that without making the cold-producing medium that is delivered to outdoor heat converter 123 from indoor heat converter 41 flow through supercooling path 34, also can form defrosting stream mechanism 126 can obtain with the turn round mode of identical flow of refrigerant of the heating and defrosting of the first embodiment.

For example, shown in Figure 32 and Figure 33, in the aircondition 101 of above-mentioned variation 2, also can make heat exchange paths supply pipe 71 from the position branch between the expansion valve 24 of liquid refrigerant pipe 27 and the liquid side of supercooling path 34.In addition, in the structure of this variation, identical with above-mentioned variation 2, in the control block diagram of Fig. 2, transfer valve 82 is connected with control part 8, to replace branched pipe side heat exchange paths selector valve 73a～73c and header sides heat exchange selector valve 74a～74c.In addition, Figure 32 is the schematic configuration diagram of the aircondition 101 of this variation, and it means cold-producing medium in the aircondition 101 mobile figure when heating running.Figure 33 means the figure of cold-producing medium in the aircondition 101 of this variation flow (the carrying out the situation of the defrosting of the first heat exchange paths 31) when heating and defrosting turns round.

Even if in this structure, shown in figure 32, by with towards arbitrary collector communicating pipe 65a～65c all not the mode of refrigerant conveying make transfer valve 82 action, also can carry out the heat running identical with above-mentioned embodiment.In addition, also can with heat under the operating state of identical transfer valve 82 of when running, carry out the cooling operation identical with above-mentioned embodiment.In addition, as shown in figure 33, by cold-producing medium mobile in heat exchange paths supply pipe 71 being delivered to which in collector communicating pipe 65a～65c collector communicating pipe isocon side selector valve 75 cuts out and select, and make collector except being transferred cold-producing medium mobile in heat exchange paths supply pipe 71 mode being connected with gas refrigerant pipe 28 collector communicating pipe communicating pipe make transfer valve 82 actions, can in the situation that not making cold-producing medium flow through supercooling path 34, carry out the heating and defrosting running identical with above-mentioned the first embodiment.

(variation 6)

In the aircondition 101 of above-mentioned variation 3, defrosting stream mechanism 126 is configured to and can makes the cold-producing medium that is delivered to outdoor heat converter 123 from indoor heat converter 41 after flowing through supercooling path 34, not flow into coolant flow divider 64, but is delivered to the gas side of the heat exchange paths of selecting arbitrarily in a plurality of heat exchange paths 31～33.Yet, in heating and defrosting running, in the situation that without making the cold-producing medium that is delivered to outdoor heat converter 123 from indoor heat converter 41 flow through supercooling path 34, also can form defrosting stream mechanism 126 can obtain with the turn round mode of identical flow of refrigerant of the heating and defrosting of the first embodiment.

Example as shown in FIG. 34 and 35, in the aircondition 101 of above-mentioned variation 3, also can make liquid refrigerant pipe 27 and transfer valve 83 be connected to replace supercooling path-heat exchange paths communicating pipe 35.In addition, in the structure of this variation, identical with above-mentioned variation 3, in the control block diagram of Fig. 2, transfer valve 83 is connected with control part 8, to replace branched pipe side heat exchange paths selector valve 73a～73c, header sides heat exchange selector valve 74a～74c and isocon side selector valve 75.In addition, Figure 34 is the schematic configuration diagram of the aircondition 101 of this variation, and it means cold-producing medium in the aircondition 101 mobile figure when heating running.Figure 35 means the figure of cold-producing medium in the aircondition 101 of this variation flow (the carrying out the situation of the defrosting of the first heat exchange paths 31) when heating and defrosting turns round.

Even if in this structure, as shown in figure 34, by so that in liquid refrigerant pipe 27 mobile flow of refrigerant to the mode of supercooling path-heat exchange paths communicating pipe 35 make transfer valve 83 actions, also can carry out the heat running identical with above-mentioned embodiment.In addition, also can with heat under the operating state of identical transfer valve 83 of when running, carry out the cooling operation identical with above-mentioned embodiment.In addition, as shown in figure 35, by to select that cold-producing medium mobile in liquid refrigerant pipe 27 is delivered to which in collector communicating pipe 65a～65c collector communicating pipe, and make collector except being transferred cold-producing medium mobile in liquid refrigerant pipe 27 mode being connected with gas refrigerant pipe 28 collector communicating pipe communicating pipe make transfer valve 83 actions, can in the situation that not making cold-producing medium flow through supercooling path 34, carry out the heating and defrosting running identical with the first embodiment.

Other embodiment of < >

Above, with reference to the accompanying drawings embodiments of the present invention and variation thereof are illustrated, but concrete structure is not limited to these embodiments and variation thereof, can in the scope of main points that does not depart from invention, changes.

(A)

In above-mentioned embodiment and variation thereof, in having the structure of the first embodiment of branched pipe side heat exchange paths selector valve 73a～73c (with reference to Fig. 1 etc.) and the second embodiment (with reference to Figure 21 etc.), defrosting stream mechanism 26,126 forms the structure with heat exchange paths supply pipe 71 and heat exchange paths branched pipe 72a～72c.

Yet, as shown in figure 36, also can adopt the structure with collector 68, to replace heat exchange paths supply pipe 71 and heat exchange paths branched pipe 72a～72c.In this structure, liquid refrigerant pipe 27 is directly connected with collector 68, one end of branched pipe side heat exchange paths selector valve 73a～73c is directly connected with collector 68, and the other end of branched pipe side heat exchange paths selector valve 73a～73c is directly connected with collector communicating pipe 65a～65c.In addition, in Figure 36, in the structure of the first embodiment, illustrate the example that adopts the defrosting stream mechanism 26 with collector 68, but in the structure of the second embodiment, as shown in figure 37, as long as adopt collector 68 and supercooling path-heat exchange paths communicating pipe 35 direct-connected defrosting stream mechanism 126.

In this structure, also can carry out the heating and defrosting running identical with above-mentioned embodiment and variation thereof.In addition, in said structure, adopted the structure of the defrosting stream mechanism 26,126 with branched pipe side heat exchange paths selector valve 73a～73c, and omitted heat exchange paths communicating pipe 71 and heat exchange paths branched pipe 72a～72c, thereby can simplify the structure of defrosting stream mechanism 26,126.

(B)

In above-mentioned embodiment and variation thereof, adopted a structure that indoor unit is connected with an outdoor unit, but be not limited thereto.For example, also can adopt the structure that structure that a plurality of indoor units are connected with outdoor unit, indoor unit be connected with a plurality of outdoor units, the structure that a plurality of indoor unit is connected with a plurality of outdoor units.

In addition, in above-mentioned embodiment and variation thereof, adopted the aircondition that can switch refrigeration and heat by four-way switching valve, but be not limited thereto.For example, can be also to heat special-purpose structure (, there is no four-way switching valve and use all the time indoor heat converter as the structure of radiator).

(C)

In above-mentioned embodiment and variation thereof, adopted along the outdoor unit that laterally blows out the type of outdoor air, but be not limited thereto.For example, also can by outdoor fan is set above outdoor heat converter towards above blow out the outdoor unit of the other types such as outdoor unit of the type of outdoor air.

(D)

In above-mentioned embodiment and variation thereof, as outdoor heat converter, adopted and intersected finned fin-tube heat exchanger, but be not limited thereto.For example, can be also as used the heat exchanger of the other types such as stacked heat exchanger of corrugated fin.In addition, the quantity that forms the heat exchange paths of outdoor heat converter is not limited to three, can be also more than four.

Industrial utilizability

The present invention can be widely used in heating in the aircondition of running.

Symbol description

1,101 airconditions

21 compressors

23,123 outdoor heat converters

26,126 defrosting stream mechanisms

31～33 heat exchange paths

34 supercooling paths

41 indoor heat converters

64 coolant flow dividers

Prior art document

Patent documentation

Patent documentation 1: Japanese Patent Laid-Open 2000-274780 communique

Patent documentation 2: Japanese Patent Laid-Open 2001-059994 communique

Claims

1. an aircondition (1,101), by connecting successively compressor (21), indoor heat converter (41) and outdoor heat converter (23,123), form, wherein, described compressor compresses cold-producing medium, described indoor heat converter dispels the heat to the cold-producing medium after compressed in described compressor, described outdoor heat converter evaporates this cold-producing medium by making in described indoor heat converter cold-producing medium after heat radiation and outdoor air carry out heat exchange

Described aircondition can make the running that heats that cold-producing medium circulates successively in described compressor, described indoor heat converter, described outdoor heat converter, described compressor,

It is characterized in that,

Described outdoor heat converter has a plurality of heat exchange paths (31～33) that connect side by side each other,

The liquid side of a plurality of described heat exchange paths utilizes coolant flow divider (64) to be tied together, this coolant flow divider is for being branched off into the cold-producing medium that is delivered to described outdoor heat converter from described indoor heat converter the liquid side of a plurality of described heat exchanger passages

In described aircondition, be also provided with defrosting stream mechanism (26,126), this defrosting stream mechanism for being delivered to the cold-producing medium that is delivered to described outdoor heat converter from described indoor heat converter the gas side of any heat exchange paths of selecting from a plurality of described heat exchange paths not flowing into described coolant flow divider

Described aircondition carries out heating and defrosting running, in this heating and defrosting running, utilize described defrosting stream mechanism, make the cold-producing medium gas side from described any heat exchange paths not flowing into described coolant flow divider that is delivered to described outdoor heat converter from described indoor heat converter towards liquid side, flow through the inside of described any heat exchange paths, then, make the cold-producing medium that flows through described any heat exchange paths via described coolant flow divider, from the liquid side of other heat exchange paths except described any heat exchange paths, towards gas side, flow through the inside of described other heat exchange paths, thereby carry out the defrosting of described any heat exchange paths, and the cold-producing medium that is delivered to described outdoor heat converter from described indoor heat converter is evaporated.

2. aircondition as claimed in claim 1 (101), is characterized in that,

Described outdoor heat converter (123) also has supercooling path (34), the cold-producing medium that is delivered to described outdoor heat converter from described indoor heat converter (41) flows through this supercooling path before at the described coolant flow divider of inflow (64)

Described defrosting stream mechanism (126) is configured to: can, by the cold-producing medium that is delivered to described outdoor heat converter from described indoor heat converter after flowing through described supercooling path, be delivered to the gas side of any heat exchange paths of selecting from a plurality of described heat exchange paths (31～33).

3. aircondition as claimed in claim 1 (101), is characterized in that,

Described defrosting stream mechanism (126) is configured to: the cold-producing medium that is delivered to described outdoor heat converter from described indoor heat converter can be delivered to not flowing through described supercooling path to the gas side of any heat exchange paths of selecting from a plurality of described heat exchange paths (31～33).