CN104736948B

CN104736948B - Air-conditioning device

Info

Publication number: CN104736948B
Application number: CN201280076442.3A
Authority: CN
Inventors: 本田雅裕; 松本圭弘
Original assignee: Daikin Europe NV; Daikin Industries Ltd
Current assignee: Daikin Europe NV; Daikin Industries Ltd
Priority date: 2012-10-18
Filing date: 2012-10-18
Publication date: 2017-03-01
Anticipated expiration: 2032-10-18
Also published as: WO2014061134A1; EP2863153B1; JPWO2014061134A1; ES2671937T3; CN104736948A; EP2863153A1; JP5955401B2; EP2863153A4

Abstract

Air-conditioning device (1) includes refrigerant loop (10), this refrigerant loop (10) has compressor (21), outdoor heat converter (23), indoor heat converter (42a, 42b) and heat-storage heat exchanger (28), this heat-storage heat exchanger (28) carries out heat exchange between cold-producing medium and heat-storing material, above-mentioned this air-conditioning device (1) carries out accumulation of heat operating, and can carry out accumulation of heat in defrosting operating using operating and heating operation simultaneously.In air-conditioning device (1), it is provided with indoor expansion valve (41a, indoor unit (4a 41b), 4b) there is indoor control unit (48a, 48b), in the case of only carrying out heating operation, above-mentioned indoor control unit (48a, 48b) determine indoor expansion valve (41a, aperture 41b), the outdoor unit (2) being provided with outdoor expansion valve (24) has outside control unit (38), in the case of only carrying out heating operation, above-mentioned outside control unit (38) determines the aperture of outdoor expansion valve (24), in the case of carrying out heating operation in accumulation of heat using the defrosting operating operating, above-mentioned outside control unit (38) determines indoor expansion valve (41a, aperture 41b) and the aperture of outdoor expansion valve (24).

Description

Air-conditioning device

Technical field

The present invention relates to a kind of air-conditioning device, more particularly to this air-conditioning device as follows, this air-conditioning device includes freezing Agent loop, this refrigerant loop has the heat-storage heat exchanger making to carry out heat exchange between cold-producing medium and heat-storing material, this air-conditioning Device carries out accumulation of heat operating, and can carry out accumulation of heat in defrosting operating using operating and heating operation, wherein above-mentioned accumulation of heat simultaneously Operating refers to carry out the fortune of accumulation of heat by making heat-storage heat exchanger to heat-storing material as the radiator function of cold-producing medium Turn, above-mentioned accumulation of heat is referred to by making heat-storage heat exchanger as the vaporizer function of cold-producing medium from accumulation of heat material by the use of operating The operating radiated in material.

Background technology

There is a kind of air-conditioning device always, such as shown in patent documentation 1 (2005 No. 337657 publications of Japanese Patent Laid-Open), This air-conditioning device includes refrigerant loop, this refrigerant loop have compressor, outdoor heat converter, indoor heat converter and Carry out the heat-storage heat exchanger of heat exchange between cold-producing medium and heat-storing material, this air-conditioning device carries out accumulation of heat operating, and can remove Carry out accumulation of heat using operating and heating operation during frost operating simultaneously.Here, accumulation of heat operating refers to make by making heat-storage heat exchanger Carry out the operating of accumulation of heat for the radiator function of cold-producing medium to heat-storing material.Defrosting operating is by making outdoor heat exchange Device carries out the operating of the defrosting of outdoor heat converter as the radiator function of cold-producing medium.Accumulation of heat is to pass through using operating Make the operating that heat-storage heat exchanger is radiated from heat-storing material as the vaporizer function of cold-producing medium.Heating operation is Make indoor heat converter as the operating of the radiator function of cold-producing medium.

Content of the invention

Above-mentioned existing air-conditioning device has indoor unit and outdoor unit, and wherein, above-mentioned indoor unit is provided with Indoor Thermal Exchanger and for the indoor expansion valve that is changed of flow to the cold-producing medium of flowing in heat exchanger indoors, above-mentioned outdoor Unit is provided with outdoor heat converter and is used for the room that the flow of the cold-producing medium of flowing in outdoor heat converter is changed Outer expansion valve.And, (that is, carrying out without accumulation of heat using operating and defrosting operating when carrying out common heating operation During heating operation), the degree of subcooling of the cold-producing medium in the exit based on indoor heat converter is carried out to the aperture of indoor expansion valve Control (being controlled by the degree of subcooling that indoor expansion valve is carried out), therefore ensure that the heating capacity of indoor heat converter.Here, by setting The indoor control unit of unit disposed within determines the aperture of the indoor expansion valve in the control of this degree of subcooling.

In with accumulation of heat using the defrosting operating operating, in this air-conditioning device, carry out the situation of heating operation simultaneously Under, when the defrosting ability of outdoor heat converter has more than needed, with carry out identical during common heating operation, as long as by indoor The aperture that control unit carries out indoor expansion valve controls it is ensured that the heating capacity of indoor heat converter.

But, outdoor heat converter defrosting ability do not exist more than needed in the case of, in order to limit indoor heat converter Heating capacity, need to make the aperture of indoor expansion valve control from carry out different during common heating operation.Here, when indoor swollen When the aperture of swollen valve is excessive with respect to the aperture of outdoor expansion valve, the restriction to the heating capacity of indoor heat converter is insufficient, And the defrosting ability of outdoor heat converter is insufficient, therefore defrosting operating is in the incomplete state of defrosting of outdoor heat converter Lower end.On the contrary, when the aperture of indoor expansion valve is too small with respect to the aperture of outdoor expansion valve although outdoor heat converter Defrosting ability fully, but excessively limits to the heating capacity of indoor heat converter, therefore, no longer can fully obtain using with Accumulation of heat carries out this advantage of heating operation using the defrosting operating of operating.

The technical problem to be solved of the present invention is, provides a kind of air-conditioning device, and this air-conditioning device includes cold-producing medium and returns Road, this refrigerant loop has the heat-storage heat exchanger carrying out heat exchange between cold-producing medium and heat-storing material, this air-conditioning device Carry out accumulation of heat operating, and accumulation of heat can be carried out in defrosting operating using operating and heating operation simultaneously, can suitably determine Carry out the indoor expansion valve in the case of heating operation and outdoor expansion valve with the defrosting operating using operating for the accumulation of heat simultaneously Aperture.

The air-conditioning device of the first technical scheme includes refrigerant loop, and this refrigerant loop has compressor, outdoor heat is handed over Parallel operation, indoor heat converter and heat-storage heat exchanger, this heat-storage heat exchanger carries out heat friendship between cold-producing medium and heat-storing material Change, above-mentioned air-conditioning device is by accumulation of heat operating, and accumulation of heat can be carried out in defrosting operating using operating and heating operation simultaneously Air-conditioning device.Here, accumulation of heat operating refer to by make heat-storage heat exchanger as the radiator function of cold-producing medium to Heat-storing material carries out the operating of accumulation of heat.Defrosting operating refers to play work(by making outdoor heat converter as the radiator of cold-producing medium Can and carry out the operating of the defrosting of outdoor heat converter.Accumulation of heat refers to be used as cold-producing medium by making heat-storage heat exchanger by the use of operating Vaporizer function and the operating radiated from heat-storing material.Heating operation is to instigate indoor heat converter as system The operating of the radiator function of cryogen.In addition, refrigerant loop also has：Indoor expansion valve, this indoor expansion valve is used for The flow of the cold-producing medium of flowing in heat exchanger indoors is changed；And outdoor expansion valve, this outdoor expansion valve is used for The flow of the cold-producing medium of flowing in outdoor heat converter is changed.Here, indoor heat converter and indoor expansion valve set In indoor unit, outdoor heat converter and outdoor expansion valve are located at outdoor unit.And, in this air-conditioning device, indoor unit There is indoor control unit, in the case of only carrying out heating operation, indoor control unit determines the aperture of indoor expansion valve, room Outer unit has outside control unit, and in the case of only carrying out heating operation, outside control unit determines outdoor expansion valve Aperture, in the case of carrying out heating operation in accumulation of heat using the above-mentioned defrosting operating operating, outside control unit is true Determine the aperture of indoor expansion valve and the aperture of outdoor expansion valve.

Here, in the case of only carrying out heating operation, indoor control unit determines the aperture of indoor expansion valve, and room Outside control unit determines the aperture of outdoor expansion valve, but carries out heating operation in accumulation of heat using the defrosting operating operating In the case of, outside control unit not only determines the aperture of outdoor expansion valve, and also determines that the aperture of indoor expansion valve.Therefore, In the case of carrying out heating operation in the defrosting operating using operating for the accumulation of heat, outside control unit is it is contemplated that outdoor The balance of the defrosting ability of heat exchanger and the heating capacity of indoor heat converter, with the comprehensive aperture determining outdoor expansion valve and The aperture of indoor expansion valve.

Thus, here, with accumulation of heat using operating defrosting operating in carry out heating operation in the case of, can be suitable Ground determines the aperture of indoor expansion valve and outdoor expansion valve.

The air-conditioning device of the second technical scheme on the basis of the air-conditioning device of the first technical scheme, when with accumulation of heat profit In the case of carrying out heating operation in the defrosting operating of operating, start to play from defrosting operating and through the first defrosting time be Only, the condensation temperature based on the cold-producing medium in refrigerant loop and the indoor temperature of air adjustment object space of indoor unit Dependency relation, determines the aperture of indoor expansion valve.

In the case of carrying out heating operation in accumulation of heat using the defrosting operating operating, need to reliably ensure that interior The heating capacity of heat exchanger, and it needs to be determined that the aperture of indoor expansion valve.But, determine indoor swollen in outside control unit In the case of the aperture of swollen valve, it is difficult to the pressure in view of the cold-producing medium in the refrigerant pipe being connected outdoor unit with indoor unit The impact of power loss etc..

So, here, as described above, starting to play till the first defrosting time from defrosting operating, based on refrigeration The dependency relation of the indoor temperature of air adjustment object space of the condensation temperature of the cold-producing medium in agent loop and indoor unit, really Determine the aperture of indoor expansion valve.For example in the case that condensation temperature is less than the threshold temperature obtaining according to indoor temperature, outdoor control Portion processed is judged to not guarantee the heating capacity of indoor heat converter, thus increasing the aperture of indoor expansion valve and guaranteeing that Indoor Thermal is handed over The heating capacity of parallel operation.And, here, as described above, starting to play till the first defrosting time from defrosting operating In scope, the aperture carrying out this indoor expansion valve determines, at the initial stage of defrosting operating, preferentially guarantees the system of indoor heat converter Heat energy power, and carry out defrosting operating.

Thus, here, outdoor control unit is by suitably determining room based on the dependency relation of condensation temperature and indoor temperature The aperture of interior expansion valve, can preferentially guarantee the heating capacity of indoor heat converter, and can carry out defrosting operating.

The air-conditioning device of the 3rd technical scheme, on the basis of the air-conditioning device of the second technical scheme, is being opened from defrosting operating After having begun to have passed through the first defrosting time, to reduce the heating capacity of indoor heat converter, and increase outdoor heat converter The mode of defrosting ability changes the aperture of indoor expansion valve and outdoor expansion valve.

In the case of carrying out heating operation in accumulation of heat using the defrosting operating operating, in order to reliably terminate outdoor The defrosting of heat exchanger, needs to increase the defrosting ability of outdoor heat converter.

So, here, as described above, after have passed through the first defrosting time from defrosting operating starting, to reduce interior The mode of the heating capacity of heat exchanger and the defrosting ability increasing outdoor heat converter changes indoor expansion valve and outdoor is swollen The aperture of swollen valve.For example after have passed through the first defrosting time from defrosting operating starting, outdoor control unit reduces indoor expansion The aperture of valve, and increase the aperture of outdoor expansion valve, to reduce the heating capacity of indoor heat converter, and increase outdoor heat The defrosting ability of exchanger, thus transfer to, from the operating preferentially being heated, the operating preferentially being defrosted.

Thus, here, outdoor control unit passes through suitably to determine the aperture of indoor expansion valve and outdoor expansion valve, can be from excellent The operating preferentially being defrosted is transferred in the operating first being heated, reliably to terminate the defrosting of outdoor heat converter.

The air-conditioning device of the 4th technical scheme on the basis of the air-conditioning device of the 3rd technical scheme, based on supplying outdoor unit The outdoor temperature of the space outerpace of configuration determines the first defrosting time.

Constitute the equipment of refrigerant loop and from the scattering losses of the heat-storing material time generation impact required on defrosting, Time needed for therefore defrosting is in the lower and longer tendency of outdoor temperature.Thus, it is desirable that also based on outdoor temperature, Determine time, i.e. the first defrosting time heating preferential operating into enforcement.

So, here, as described above, the first defrosting time is determined based on outdoor temperature.For example outdoor temperature is lower, then get over Needing to shorten and make to heat the time of preferential operating, extending the time making the preferential operating of defrosting, it is thus determined that being：Outdoor temperature Lower, then the first defrosting time is shorter.

Thus, here, by the first defrosting time heating preferential operating into enforcement is determined based on outdoor temperature, can Extend into and exercise the preferential operating of defrosting, reliably to terminate the defrosting of outdoor heat converter.

The sky of the air-conditioning device of the 5th technical scheme arbitrary technical scheme in the second technical scheme to the 4th technical scheme On the basis of adjusting device, in defrosting operating, based on the degree of superheat of the cold-producing medium discharged from compressor, judge indoor expansion valve Aperture whether become too much.

In the case of carrying out heating operation in accumulation of heat using the defrosting operating operating, when the aperture of indoor expansion valve When becoming too much, the cold-producing medium in the exit of indoor heat converter easily becomes gas-liquid two-phase state.So, by interior The outlet side (hydraulic fluid side) of heat exchanger and as cold-producing medium vaporizer function heat-storage heat exchanger entrance side (liquid Side) in the refrigerant pipe that connects, the cold-producing medium of easy gassy state.Here, in refrigerant loop, when not by room The outlet side (hydraulic fluid side) of inside heat exchanger and as cold-producing medium vaporizer function heat-storage heat exchanger entrance side It may occur however that liquid refrigerant returns to via heat-storage heat exchanger in the case that the part that (hydraulic fluid side) connects is provided with receptor So-called liquid backflow in compressor.And, when there is liquid backflow, the degree of superheat of the cold-producing medium discharged from compressor The tendency reducing occurs.

So, here, the degree of superheat based on the cold-producing medium discharged from compressor for the outdoor control unit, judge because of indoor expansion The aperture of valve becomes too much and so that liquid is flowed back and occur.For example the degree of superheat in the cold-producing medium discharged from compressor is less than threshold mistake In the case of temperature, outdoor control unit judges to there occurs that liquid flows back.And, reduce the aperture of indoor expansion valve as needed.

Thus, here, indoor expansion valve can suitably be judged with accumulation of heat using in the defrosting operating operating Whether aperture becomes too much, carries out heating operation.

Brief description

Fig. 1 is the summary construction diagram of the air-conditioning device of one embodiment of the present invention.

Fig. 2 is the summary construction diagram of heat-storage heat exchanger.

Fig. 3 is the control block diagram of air-conditioning device.

Fig. 4 is the figure of the flowing of the cold-producing medium in the refrigerant loop representing in cooling operation.

Fig. 5 is the figure of the flowing of the cold-producing medium in the refrigerant loop representing in heating operation.

Fig. 6 is the flowing of the cold-producing medium in the refrigerant loop representing in accumulation of heat operating (accumulation of heat operating during heating operation) Figure.

Fig. 7 is the cold-producing medium in the refrigerant loop representing in defrosting operating (with accumulation of heat using the defrosting operating operating) Flowing figure.

Fig. 8 is indoor expansion valve and outdoor expansion valve in defrosting operating (with accumulation of heat using the defrosting operating operating) The flow chart that aperture determines.

Fig. 9 is indoor expansion valve and the outdoor expansion representing in defrosting operating (with accumulation of heat using the defrosting operating operating) The figure of the timeliness change of the aperture of valve.

Figure 10 is indoor expansion valve and room in the defrosting operating (with accumulation of heat using the defrosting operating operating) of variation 2 The flow chart that the aperture of outer expansion valve determines.

Specific embodiment

Hereinafter, based on accompanying drawing, the embodiment of the air-conditioning device to the present invention illustrates.In addition, the air-conditioning dress of the present invention The specific structure of the embodiment put is not limited to embodiment disclosed below and its variation, can be in the master without departing from invention Changed in the range of purport.

(1) basic structure of air-conditioning device

Fig. 1 is the summary construction diagram of the air-conditioning device 1 of one embodiment of the present invention.Air-conditioning device 1 is by being steamed The kind of refrigeration cycle of vapour compression operates and is used for the device carrying out air adjustment within doors to building etc..Mainly pass through outdoor Unit 2 is connected and constitutes air-conditioning device 1 with multiple stage (here is two) indoor unit 4a, 4b.Here, outdoor unit 2 and multiple stage Indoor unit 4a, 4b linked together via liquid refrigerant communicating pipe 6 and gas refrigerant communicating pipe 7.That is, by making room Outer unit 2 and multiple stage indoor unit 4a, 4b link together via cold-producing medium communicating pipe 6,7, to constitute the steam of air-conditioning device 1 The refrigerant loop 10 of compression.

＜ indoor unit ＞

Indoor unit 4a, 4b are disposed in the interior.Indoor unit 4a, 4b are via cold-producing medium communicating pipe 6,7 with outdoor unit 2 even Connect, and constitute a part for refrigerant loop 10.

Next, the structure of explanation indoor unit 4a, 4b.In addition, indoor unit 4b have same with indoor unit 4a Structure, therefore in the structure of this explanation indoor unit 4a, with regard to the structure of indoor unit 4b, marks footmark b to replace respectively Represent the footmark a of each several part of indoor unit 4a, omit the explanation to each several part.

Indoor unit 4a mainly has the indoor refrigerant loop 10a of the part constituting refrigerant loop 10 (in room It is indoor refrigerant loop 10b in interior unit 4b).Indoor refrigerant loop 10a mainly has indoor expansion valve 41a and room Inside heat exchanger 42a.

Indoor expansion valve 41a is to make the cold-producing medium decompression of flowing in side refrigerant loop 10a indoors thus to indoors The valve that in heat exchanger 42a, the flow of the cold-producing medium of flowing is changed.Indoor expansion valve 41a is and indoor heat converter 42a Hydraulic fluid side connect electric expansion valve.

Indoor heat converter 42a is for example made up of the fin tube type heat exchanger of cross-fin formula.Heat exchanger indoors It is provided with the indoor fan 43a for being transported to room air in indoor heat converter 42a near 42a.By using indoor wind Fan 43a conveys room air to indoor heat converter 42a, makes between cold-producing medium and room air indoors in heat exchanger 42a Carry out heat exchange.Drive indoor fan 43a rotation using indoor fan motor 44a.Thus, indoor heat converter 42a conduct The vaporizer function of the radiator of cold-producing medium and cold-producing medium.

In addition, being provided with various sensors in unit 4a indoors.The hydraulic fluid side of heat exchanger 42a is provided with indoors The hydraulic fluid side temperature sensor 45a that temperature Trla of liquid condition or the cold-producing medium of gas-liquid two-phase state is detected.In room The gas side of inside heat exchanger 42a is provided with the gas side temperature biography that temperature Trga of the cold-producing medium to gaseous state is detected Sensor 46a.The suction inlet side of the room air of unit 4a is provided with indoor temperature transmitter 47a indoors, and this indoor temperature passes The temperature (that is, indoor temperature Tra) of the room air of the air adjustment object space to indoor unit 4a for the sensor 47a is examined Survey.In addition, indoor unit 4a has the indoor control unit that the action to each several part constituting indoor unit 4a is controlled 48a.And, indoor control unit 48a has microcomputer and storage in order to indoor unit 4a is controlled and is arranged Device etc., energy and the exchange for being controlled signal etc. between the individually remote controllers 49a of operation indoor unit 4a, and The exchange of signal etc. can be controlled and outdoor unit 2 between.In addition, remote controllers 49a is user carrying out and operation of air conditioner Related various settings and the equipment of operating/halt instruction.

＜ outdoor unit ＞

Outdoor unit 2 is arranged without.Outdoor unit 2 is connected with indoor unit 4a, 4b via cold-producing medium communicating pipe 6,7, And constitute a part for refrigerant loop 10.

Next, the structure of explanation outdoor unit 2.

Outdoor unit 2 mainly has the outside refrigerant loop 10c of the part constituting refrigerant loop 10.This outdoor Side refrigerant loop 10c mainly have compressor 21, the first switching mechanism 22, outdoor heat converter 23, outdoor expansion valve 24, Two switching mechanisms 27, heat-storage heat exchanger 28 and accumulation of heat expansion valve 29.

Compressor 21 is the compression electromechanics containing compressing member (not shown) in housing and driving compressing member rotation The hermetic type compressor of motivation 20.By DC-to-AC converter (not shown) to air compressor motor 20 supply electric power, compression is dynamo-electric Motivation 20 is changed by the frequency (that is, rotating speed) making DC-to-AC converter, can change running capacity.

First switching mechanism 22 is the four-way switching valve of the flow direction for switching cold-producing medium.Make outdoor heat converter In the case that 23 as the radiator function of cold-producing medium, the first switching mechanism 22 enters to be about to discharge side and the room of compressor 21 The gas side of outer heat-exchanger 23 connects and by the gas side of heat-storage heat exchanger 28 and cutting that the suction side of compressor 21 is connected Change (outdoor radiating switching state, with reference to the solid line of first switching mechanism 22 of Fig. 1).Here, making the first switching mechanism 22 cut When changing outdoor radiating switching state into, heat-storage heat exchanger 28 can be made as the vaporizer function of cold-producing medium.In addition, making In the case that outdoor heat converter 23 is as the vaporizer function of cold-producing medium, the first switching mechanism 22 enters to be about to compressor 21 Suction side be connected with the gas side of outdoor heat converter 23 and the row by the gas side of heat-storage heat exchanger 28 and compressor 21 Go out the switching (outdoor evaporation switching state, with reference to the dotted line of first switching mechanism 22 of Fig. 1) of side connection.Here, making second When switching mechanism 22 switches to outdoor evaporation switching state, heat-storage heat exchanger 28 can be made to play work(as the radiator of cold-producing medium Energy.In addition, the first switching mechanism 22 may not be four-way switching valve, but be configured to by three-way valve and electromagnetic valve etc. combination with Play the component of identical function.

Outdoor heat converter 23 is for example made up of the fin tube type heat exchanger of cross-fin formula.In outdoor heat converter 23 Vicinity be provided with the outdoor fan 25 for being transported to outdoor air in outdoor heat converter 23.By with outdoor fan 25 Outdoor air is conveyed to outdoor heat converter 23, makes between cold-producing medium and outdoor air, to carry out heat friendship in outdoor heat converter 23 Change.Outdoor fan 25 is driven to rotate using outdoor fan motor 26.Thus, outdoor heat converter 23 is as the radiating of cold-producing medium The vaporizer function of device and cold-producing medium.

Outdoor expansion valve 24 is the cold-producing medium flowing in outdoor heat converter 23 making in the refrigerant loop 10c of outside Decompression is thus the valve that is changed of flow to the cold-producing medium flowing outdoor heat converter 23 in.Outdoor expansion valve 24 be with The electric expansion valve that the hydraulic fluid side of outdoor heat converter 23 connects.

Second switching mechanism 27 is the four-way switching valve of the flow direction for switching cold-producing medium.Make indoor heat converter In the case that 42a, 42b are as the vaporizer function of cold-producing medium, the second switching mechanism 27 enters to be about to the suction of compressor 21 (indoor evaporation switching state, with reference to the reality of second switching mechanism 27 of Fig. 1 for the switching that side was connected with gas refrigerant communicating pipe 7 Line).In addition, make indoor heat converter 42a, 42b as the radiator function of cold-producing medium in the case of, the second switching machine Structure 27 enters to be about to switching (indoor radiating switching state, the reference that the discharge side of compressor 21 is connected with gas refrigerant communicating pipe 7 The dotted line of second switching mechanism 27 of Fig. 1).Here, one of four ports of the second switching mechanism 27 (Fig. 1 by paper Right side port) with via capillary tube 271 all the time and compressor 21 suction side be connected port (Fig. 1 by paper on the upside of Port) connect, thus actually becoming the port being not used.In addition, the second switching mechanism 27 may not be four-way switching Valve, but be configured to combine three-way valve and electromagnetic valve etc. to play the component of identical function.

Heat-storage heat exchanger 28 is the heat exchanger making to carry out heat exchange between cold-producing medium and heat-storing material, by being used as The radiator function of cold-producing medium and carry out the accumulation of heat to heat-storing material, and by the vaporizer function as cold-producing medium And radiated from heat-storing material (accumulation of heat utilization) when, using this heat-storage heat exchanger 28.Heat-storage heat exchanger 28 mainly has There are the heat storage tank 281 containing heat-storing material and the heat transfer tube group 282 being configured to impregnated in heat-storing material.Here, as Fig. 2 institute Show, heat storage tank 281 is the casing of approximately parallelepiped body shape, internally contains heat-storing material.As heat-storing material, here uses Carry out the material of accumulation of heat by phase transformation.Specifically, using the Polyethylene Glycol of the phase change temperature with 30 DEG C～40 DEG C about, Sulphuric acid sodium hydrate and paraffin etc., carrying out phase transformation (melting) when heat-storage heat exchanger 28 is used as the radiator of cold-producing medium Accumulation of heat, and carry out phase transformation (solidification) and utilize accumulation of heat when heat-storage heat exchanger 28 being used as the vaporizer of cold-producing medium.As Fig. 2 institute Show, heat transfer tube group 282 has by being arranged on collector 283 and diverter 284 and the multiple heat-transfer pipes at the gateway of cold-producing medium The structure that 285 branch ground connect.Here, multiple heat-transfer pipes 285 are respectively provided with the shape turned back along the vertical direction, above-mentioned by making The two ends of multiple heat-transfer pipes 285 are connected to constitute heat pipe group 282 with collector 283 and diverter 284.And, accumulation of heat heat exchange The gas side (that is, one end of heat transfer tube group 282) of device 28 is connected with the first switching mechanism 22, the hydraulic fluid side of heat-storage heat exchanger 28 (that is, the other end of heat transfer tube group 282) (here is outside refrigerant loop with refrigerant loop 10 via accumulation of heat expansion valve 29 Outdoor expansion valve 24 10c) is connected with the part between liquid refrigerant communicating pipe 6.Here, Fig. 2 is heat-storage heat exchanger 28 Summary construction diagram.

Accumulation of heat expansion valve 29 is the cold-producing medium flowing in heat-storage heat exchanger 28 making in the refrigerant loop 10c of outside Decompression is thus the valve that is changed of flow to the cold-producing medium flowing heat-storage heat exchanger 28 in.Accumulation of heat expansion valve 29 be with The electric expansion valve that the hydraulic fluid side of heat-storage heat exchanger 28 connects.

In addition, being provided with various sensors in outdoor unit 2.It is provided with to compressor 21 in outdoor unit 2 The discharge pressure that suction pressure sensor 31 that suction pressure Ps is detected, discharge pressure Pd to compressor 21 are detected Inlet temperature sensor 33 and the row to compressor 21 that sensor 32, inlet temperature Ts to compressor 21 are detected Go out the discharge temperature sensor 34 that temperature Td is detected.Outdoor heat converter 23 is provided with the refrigeration to gas-liquid two-phase state The outdoor heat exchange temperature sensor 35 that temperature Tol1 of agent is detected.It is right to be provided with the hydraulic fluid side of outdoor heat converter 23 The hydraulic fluid side temperature sensor 36 that temperature Tol2 of the cold-producing medium of liquid condition or gas-liquid two-phase state is detected.Outdoor single The suction inlet side of the outdoor air of unit 2 is provided with outdoor temperature sensor 37, and this outdoor temperature sensor 37 is to for outdoor unit 2 Temperature (that is, the outdoor temperature of the outdoor air of space outerpace that (that is, outdoor heat converter 23 and heat-storage heat exchanger 28) configures Ta) detected.In addition, outdoor unit 2 has the outside control that the action to each several part constituting outdoor unit 2 is controlled Portion 38 processed.And, outside control unit 38 have to the microcomputer arranging to control outdoor unit 2, memorizer and DC-to-AC converter that air compressor motor 25 is controlled etc., can with indoor control unit 48a, 48b of indoor unit 4a, 4b it Between be controlled the exchange of signal etc..

＜ cold-producing medium communicating pipe ＞

Cold-producing medium communicating pipe 6,7 is to arrange the refrigerant pipe constructed at the scene during air-conditioning device 1, according to outdoor unit 2 and indoor unit 4a, 4b setting condition using having various length and the cold-producing medium communicating pipe of caliber.

＜ control unit ＞

As shown in figure 1, for the remote controllers 49a of individually operated indoor unit 4a, 4b, 49b, indoor unit 4a, 4b Indoor control unit 48a, 48b and the outside control unit 38 of outdoor unit 2 constitute operate overall to air-conditioning device 1 The control unit 8 controlling.As shown in figure 3, control unit 8 with can receive various sensors 31～37,45a, 45b, 46a, 46b, 47a, The mode of the detection signal of 47b etc. is connected with various sensors 31～37,45a, 45b, 46a, 46b, 47a, 47b.And, control Portion 8 be configured to by detection signal based on above-mentioned various sensors etc. to various equipment and valve 20,22,24,26,41a, 41b, 44a, 44b are controlled, and can carry out operation of air conditioner (cooling operation and heating operation).Here, Fig. 3 is the control of air-conditioning device 1 Block diagram processed.

As described above, air-conditioning device 1 has by making multiple stage (here is two) indoor unit 4a, 4b and outdoor unit 2 The refrigerant loop 10 connecting and constituting.And, in air-conditioning device 1, carry out following such operating control using control unit 8 System.

(2) basic actss of air-conditioning device

Next, using Fig. 4 to Fig. 7 to the cooling operation of air-conditioning device 1, heating operation, accumulation of heat operating and defrosting operating Basic actss illustrate.Here, Fig. 4 is the figure of the flowing of the cold-producing medium in the refrigerant loop representing in cooling operation. Fig. 5 is the figure of the flowing of the cold-producing medium in the refrigerant loop representing in heating operation.Fig. 6 is to represent that accumulation of heat operating (heats fortune When turning accumulation of heat operating) in refrigerant loop in the flowing of cold-producing medium figure.Fig. 7 is to represent defrosting operating (with accumulation of heat Using operating defrosting operating) in refrigerant loop in cold-producing medium flowing figure.

＜ cooling operation ＞

When sending the instruction of cooling operation from remote controllers 49a, 49b, the first switching mechanism 22 is made to switch to outdoor Radiating switching state (state indicated by the solid line of first switching mechanism 22 of Fig. 4), and so that the second switching mechanism 27 is switched Become indoor evaporation switching state (state indicated by the solid line of second switching mechanism 27 of Fig. 4), and make accumulation of heat expansion valve 29 It is in the state (that is, not using the state of heat-storage heat exchanger 28) of closing, make compressor 21, outdoor fan 25 and indoor fan 43a, 43b start.

So, the gas refrigerant of the low pressure in refrigerant loop 10 is inhaled in compressor 21 and is compressed and become The gas refrigerant of high pressure.The gas refrigerant of this high pressure is transported to outdoor heat converter 23 via the first switching mechanism 22 Interior.The gas refrigerant being transported to high pressure in outdoor heat converter 23 is in the room of the radiator function as cold-producing medium In outer heat-exchanger 23, carrying out heat exchange with the outdoor air being supplied by outdoor fan 25 and be cooled, thus condensing, becoming The liquid refrigerant of high pressure.The liquid refrigerant of this high pressure is via outdoor expansion valve 24 and liquid refrigerant communicating pipe 6 from outdoor Unit 2 is transported in indoor unit 4a, 4b.

The liquid refrigerant of the high pressure being transported in indoor unit 4a, 4b is formed by indoor expansion valve 41a, 41b decompression Cold-producing medium for the gas-liquid two-phase state of low pressure.The cold-producing medium of the gas-liquid two-phase state of this low pressure is transported to indoor heat converter In 42a, 42b.The cold-producing medium being transported to the gas-liquid two-phase state of low pressure in indoor heat converter 42a, 42b is as refrigeration In indoor heat converter 42a, 42b of the vaporizer function of agent, with the room air being come by indoor fan 43a, 43b supply Carrying out heat exchange and be heated, thus evaporating, becoming the gas refrigerant of low pressure.The gas refrigerant of this low pressure is via liquid system Cryogen communicating pipe 6 is transported in outdoor unit 2 from indoor unit 4a, 4b.

It is transported to the gas refrigerant of low pressure in outdoor unit 2 via the second switching mechanism 27 again by compressor 21 Suck.

＜ heating operation ＞

When sending the instruction of heating operation from remote controllers 49a, 49b, the first switching mechanism 22 is made to switch to outdoor Evaporation switching state (state being represented by dashed line of first switching mechanism 22 of Fig. 5), and so that the second switching mechanism 27 is switched Become indoor radiating switching state (state being represented by dashed line of second switching mechanism 27 of Fig. 5), and make accumulation of heat expansion valve 29 It is in the state (that is, not using the state of heat-storage heat exchanger 28) of closing, make compressor 21, outdoor fan 25 and indoor fan 43a, 43b start.

So, the gas refrigerant of the low pressure in refrigerant loop 10 is inhaled in compressor 21 and is compressed and become The gas refrigerant of high pressure.The gas refrigerant of this high pressure is via the second switching mechanism 27 and gas refrigerant communicating pipe 7 from room Outer unit 2 is transported in indoor unit 4a, 4b.

The gas refrigerant of the high pressure being transported in indoor unit 4a, 4b is transported to indoor heat converter 42a, 42b Interior.The gas refrigerant of the high pressure being transported in indoor heat converter 42a, 42b plays work(in the radiator as cold-producing medium Can indoor heat converter 42a, 42b in, carry out heat exchange and cold with by the room air that indoor fan 43a, 43b supply comes But, thus condensing, become the liquid refrigerant of high pressure.The liquid refrigerant of this high pressure is reduced pressure by indoor expansion valve 41a, 41b.Quilt The cold-producing medium that indoor expansion valve 41a, 41b have reduced pressure is transported to room via liquid refrigerant communicating pipe 6 from indoor unit 4a, 4b In outer unit 2.

The cold-producing medium being transported in outdoor unit 2 is transported in outdoor expansion valve 24, is reduced pressure by outdoor expansion valve 24 And become the cold-producing medium of the gas-liquid two-phase state of low pressure.The cold-producing medium of the gas-liquid two-phase state of this low pressure is transported to outdoor heat and hands over In parallel operation 23.The cold-producing medium being transported to the gas-liquid two-phase state of low pressure in outdoor heat converter 23 is in the steaming as cold-producing medium Send out in the outdoor heat converter 23 of device function, carry out heat exchange with the outdoor air being supplied by outdoor fan 25 and added Heat, thus evaporating, becomes the gas refrigerant of low pressure.The gas refrigerant of this low pressure is pressed again via the first switching mechanism 22 Contracting machine 21 sucks.

＜ accumulation of heat operating (accumulation of heat operating during heating operation) ＞

In heating operation, carry out accumulation of heat operating, this accumulation of heat operating refers to be used as refrigeration by making heat-storage heat exchanger 28 The radiator function of agent and carry out the operating of accumulation of heat to heat-storing material.That is, entering to exercise outdoor heat converter 23 as system The vaporizer function of cryogen, and make indoor heat converter 42a, 42b heating as the radiator function of cold-producing medium During operating, carry out accumulation of heat operating (accumulation of heat operating during heating operation), this accumulation of heat operating refers to by making heat-storage heat exchanger 28 Carry out the operating of accumulation of heat as the radiator function of cold-producing medium to heat-storing material.By making switching mechanism 22,27 cut Change into heating operation identical switching state on the basis of open accumulation of heat expansion valve 29, to carry out accumulation of heat during this heating operation Operating (with reference to Fig. 6).

So, the gas refrigerant of the low pressure in refrigerant loop 10 is inhaled in compressor 21 and is compressed and become The gas refrigerant of high pressure.Identical with during heating operation, a part for the gas refrigerant of this high pressure is via the second switching mechanism 27 and be transported in indoor unit 4a, 4b from outdoor unit 2 gas refrigerant communicating pipe 7.This be transported to indoor unit 4a, The gas refrigerant of the high pressure in 4b in indoor heat converter 42a, 42b of the radiator function as cold-producing medium, with Being carried out heat exchange and be cooled by the room air that indoor fan 43a, 43b supply comes, thus condensing, becoming the liquid system of high pressure Cryogen.The liquid refrigerant of this high pressure is reduced pressure by indoor expansion valve 41a, 41b.The system having been reduced pressure by indoor expansion valve 41a, 41b Cryogen was transported in outdoor unit 2 from indoor unit 4a, 4b via liquid refrigerant communicating pipe 6.

In addition, the remainder of the gas refrigerant of the high pressure discharged from compressor 21 is defeated via the first switching mechanism 22 Deliver in heat-storage heat exchanger 28.The gas refrigerant being transported to high pressure in heat-storage heat exchanger 28 is as cold-producing medium In the heat-storage heat exchanger 28 of radiator function, carrying out heat exchange with heat-storing material and be cooled, thus condensing, becoming high The liquid refrigerant of pressure.The liquid refrigerant of this high pressure is reduced pressure by accumulation of heat expansion valve 29.Here, the accumulation of heat of heat-storage heat exchanger 28 Material is heated by the heat exchange with cold-producing medium, thus undergoing phase transition (melting), carries out accumulation of heat.

The cold-producing medium having been reduced pressure by accumulation of heat expansion valve 29 and the refrigeration being transported to from indoor unit 4a, 4b in outdoor unit 2 Agent is collaborated and is transported in outdoor expansion valve 24, and is reduced pressure by outdoor expansion valve 24 and become the gas-liquid two-phase state of low pressure Cold-producing medium.The cold-producing medium of the gas-liquid two-phase state of this low pressure is transported in outdoor heat converter 23.It is transported to outdoor heat to hand over The cold-producing medium of the gas-liquid two-phase state of the low pressure in parallel operation 23 is in the outdoor heat exchange of the vaporizer function as cold-producing medium In device 23, carrying out heat exchange with the outdoor air being supplied by outdoor fan 25 and be heated, thus evaporating, becoming the gas of low pressure Cryogen.The gas refrigerant of this low pressure is sucked by compressor 21 again via the first switching mechanism 22.So, heating fortune In accumulation of heat operating when turning, heat-storage heat exchanger 28 is as the radiator of the cold-producing medium in parallel with indoor heat converter 42a, 42b Function.That is, refrigerant loop 10 is configured in the accumulation of heat operating in heating operation, the height that can will discharge from compressor 21 The gas refrigerant of pressure is transported in indoor heat converter 42a, 42b and heat-storage heat exchanger 28 in parallel.

＜ defrosting operating (with accumulation of heat using the defrosting operating operating) ＞

In heating operation, carry out carrying out as the radiator function of cold-producing medium by making outdoor heat converter 23 The defrosting operating of the defrosting of outdoor heat converter.And, in defrosting operating, carry out accumulation of heat using operating, this accumulation of heat is using fortune Turn and refer to be radiated from heat-storing material as the vaporizer function of cold-producing medium by making heat-storage heat exchanger 28 Operating.That is, enter to exercise outdoor heat converter 23 as the radiator function of cold-producing medium, and make heat-storage heat exchanger 28 conduct Using operating, (accumulation of heat during defrosting operating is utilized using operating and with accumulation of heat for the accumulation of heat of the vaporizer function of cold-producing medium The defrosting operating of operating).And, here, playing work(by making indoor heat converter 42a, 42b as the radiator of cold-producing medium Can, also carry out heating operation simultaneously.That is, here, in defrosting operating, carry out simultaneously accumulation of heat using operating and heating operation (or Carry out heating operation in accumulation of heat using the defrosting operating operating) simultaneously.First switching mechanism 22 is being switched to outdoor Radiating switching state, and on the basis of the second switching mechanism 27 is switched to indoor radiating switching state, open accumulation of heat expansion valve 29, thus the accumulation of heat carrying out during this defrosting operating utilizes operating (or with accumulation of heat using the defrosting operating operating) (with reference to Fig. 7). In addition, in defrosting operating, making outdoor fan 25 stop.

So, the gas refrigerant of the low pressure in refrigerant loop 10 is inhaled in compressor 21 and compresses and become high The gas refrigerant of pressure.Identical with during heating operation, a part for the gas refrigerant of this high pressure is via the second switching mechanism 27 And gas refrigerant communicating pipe 7 is transported in indoor unit 4a, 4b from outdoor unit 2.This is transported to indoor unit 4a, 4b The gas refrigerant of interior high pressure in indoor heat converter 42a, 42b of the radiator function as cold-producing medium, with by The room air that indoor fan 43a, 43b supply comes carries out heat exchange and is cooled, thus condensing, becomes the liquid refrigerating of high pressure Agent.The liquid refrigerant of this high pressure is reduced pressure by indoor expansion valve 41a, 41b.The refrigeration having been reduced pressure by indoor expansion valve 41a, 41b Agent was transported in outdoor unit 2 from indoor unit 4a, 4b via liquid refrigerant communicating pipe 6.

In addition, the remainder of the gas refrigerant of the high pressure discharged from compressor 21 is defeated via the first switching mechanism 22 Deliver in outdoor heat converter 23.The gas refrigerant being transported to high pressure in outdoor heat converter 23 is as cold-producing medium In the outdoor heat converter 23 of radiator function, carry out heat exchange and quilt with the frost being attached to outdoor heat converter 23 and ice Cooling.The cold-producing medium of this high pressure is reduced pressure by outdoor expansion valve 24.Here, be attached to the frost of outdoor heat converter 23 and ice by with The heat exchange of cold-producing medium and be heated, thus melting, outdoor heat converter 23 is defrosted.

The cold-producing medium of the high pressure having been reduced pressure by outdoor expansion valve 24 be transported in outdoor unit 2 from indoor unit 4a, 4b Cold-producing medium collaborate and be transported in accumulation of heat expansion valve 29, reduced pressure by accumulation of heat expansion valve 29 and become the gas-liquid two-phase shape of low pressure The cold-producing medium of state.The cold-producing medium of the gas-liquid two-phase state of this low pressure is transported in heat-storage heat exchanger 28.It is transported to accumulation of heat The cold-producing medium of the gas-liquid two-phase state of the low pressure in heat exchanger 28 is in the accumulation of heat warm of the vaporizer function as cold-producing medium In exchanger 28, carrying out heat exchange with heat-storing material and be heated, thus evaporating, becoming the gas refrigerant of low pressure.This low pressure Gas refrigerant sucked by compressor 21 again via the first switching mechanism 22.Here, the accumulation of heat material of heat-storage heat exchanger 28 Material is cooled by the heat exchange with cold-producing medium, thus undergoing phase transition (solidification) and utilizing accumulation of heat.So, when with accumulation of heat In the case of carrying out heating operation in the defrosting operating (or accumulation of heat during defrosting operating is using operating) of operating, indoor simultaneously Heat exchanger 42a, 42b are as the radiator function of the cold-producing medium in parallel with outdoor heat converter 23.That is, refrigerant loop 10 are configured to：When carrying out in accumulation of heat using the defrosting operating (or accumulation of heat during defrosting operating is using operating) of operating simultaneously In the case of heating operation, the gas refrigerant of the high pressure discharged from compressor 21 can be transported to by refrigerant loop 10 in parallel In outdoor heat converter 23 and indoor heat converter 42a, 42b.

The control ＞ of ＜ cooling operation, heating operation and accumulation of heat operating

- during cooling operation-

In above-mentioned cooling operation, in order that the cold-producing medium in exit of each indoor heat converter 42a, 42b is overheated Degree SHra, SHrb reach target superheat degree SHras, SHrbs, and control unit 8 determines that the aperture of each indoor expansion valve 41a, 41b is gone forward side by side Row controls (below this control being referred to as " being controlled by the degree of superheat that indoor expansion valve is carried out ").Here, passing according to by suction pressure Suction pressure Ps and the indoor heat converter 42a being detected by gas side temperature sensor 46a, 46b that sensor 31 detects The cold-producing medium of gas side temperature Trga, Trgb, calculate degree of superheat SHra, SHrb.More specifically, first, pressure will be sucked Power Ps is converted into the saturation temperature of cold-producing medium, obtains the quantity of state of equal value with the evaporating pressure Pe in refrigerant loop 10, steams Send out temperature Te (although i.e., evaporating pressure Pe and evaporating temperature Te term difference itself, actual referring to identical quantity of state).? This, evaporating pressure Pe refers in cooling operation, represents in the outlet from indoor expansion valve 41a, 41b via indoor heat converter The pressure of the cold-producing medium of low pressure of flowing in the range of till the suction side of 42a, 42b arrival compressor 21.And, by from each Deduct evaporating temperature Te in temperature Trga, Trgb of the cold-producing medium of the gas side of indoor heat converter 42a, 42b, obtain the degree of superheat SHra、SHrb.

In addition, in cooling operation, using control unit 8 indoor control unit 48a, 48b come to including indoor expansion valve 41a, 41b are controlled in each equipment of interior indoor unit 4a, 4b.In addition, using control unit 8 outside control unit 38 Each equipment of the outdoor unit 2 including outdoor expansion valve 24 is controlled.

- during heating operation-

In above-mentioned heating operation, in order that the cold-producing medium in exit of each indoor heat converter 42a, 42b is supercool But degree SCra, SCrb reaches target degree of subcooling SCras, SCrbs, and control unit 8 determines the aperture of each indoor expansion valve 41a, 41b And it is controlled (below this control being referred to as " being controlled by the degree of subcooling that indoor expansion valve is carried out ").Here, according to by discharging Discharge pressure Pd and the indoor heat exchange being detected by hydraulic fluid side temperature sensor 45a, 45b that pressure transducer 32 detects Temperature Trla, Trlb of the cold-producing medium of the hydraulic fluid side of device 42a, to calculate degree of subcooling SCra, SCrb.More specifically, first, Discharge pressure Pd is converted into the saturation temperature of cold-producing medium, obtains the state of equal value with the condensing pressure Pc in refrigerant loop 10 Amount, i.e. condensation temperature Tc (although i.e., condensing pressure Pc and condensation temperature Tc term difference itself, actual refer to identical state Amount).Here, condensing pressure Pc refers in heating operation, represents in the discharge side from compressor 21 via indoor heat converter The pressure of the cold-producing medium of high pressure of flowing in the range of till 42a, 42b arrival indoor expansion valve 41a, 41b.And, by from Deduct temperature Trla, Trlb of the cold-producing medium of hydraulic fluid side of each indoor heat converter 42a, 42b in condensation temperature Tc, obtain supercool But SCra, SCrb are spent.

In addition, in heating operation, using control unit 8 indoor control unit 48a, 48b come to including indoor expansion valve 41a, 41b are controlled in each equipment of interior indoor unit 4a, 4b.In addition, the outside control unit 38 using control unit 8 is right Each equipment of the outdoor unit 2 including outdoor expansion valve 24 is controlled.

- during accumulation of heat operating-

In above-mentioned accumulation of heat operates, in the case that the accumulation of heat of the heat-storing material to heat-storage heat exchanger 28 finishes, Control unit 8 makes accumulation of heat operating terminate and be transferred to heating operation.And, have passed through the interval of regulation after accumulation of heat operation start In the case of time Δ tbet, it is transferred to defrosting operating.That is, Δ interval time tbet refers to the interval time between defrosting operating.And And, substantially the accumulation of heat operating when carrying out heating operation in a period of Δ tbet interval time and accumulation of heat operating terminate after system Heat run, every time through interval time Δ tbet all carry out defrosting operating.

As described above, in air-conditioning device 1, carrying out cooling operation and heating operation with allowing hand over.And, by system Carry out accumulation of heat operating during heat run, heating operation can be proceeded, while carrying out the accumulation of heat to heat-storing material, by Carry out accumulation of heat during defrosting operating using operating, defrosting operating can be carried out using the accumulation of heat of heat-storing material.

(3) control during defrosting operating

In the defrosting operating carrying out utilizing operating with above-mentioned accumulation of heat, deposit in the defrosting ability of outdoor heat converter 23 In the case of more than needed, (that is, carrying out without accumulation of heat using operating and defrosting operating with when carrying out common heating operation During heating operation) identical, as long as the aperture that indoor control unit 48a, 48b carry out indoor expansion valve 41a, 41b controls that (here is Controlled by the degree of subcooling that indoor expansion valve 41a, 41b are carried out) it is ensured that the heating capacity of indoor heat converter 42a, 42b. But, outdoor heat converter 23 defrosting ability do not exist more than needed in the case of, in order to limit indoor heat converter 42a, 42b Heating capacity, need to make the aperture of indoor expansion valve 41a, 41b to control different from during common heating operation.Here, working as room When the aperture of interior expansion valve 41a, 41b is excessive with respect to the aperture of outdoor expansion valve 24, indoor heat converter 42a, 42b heat The restriction of ability becomes insufficient, and the defrosting ability of outdoor heat converter 23 becomes insufficient, and therefore defrosting operating is in room Terminate in the state of the defrosting of outer heat-exchanger 23 is incomplete.On the contrary, when the aperture of indoor expansion valve 41a, 41b is with respect to outdoor Although the defrosting ability of outdoor heat converter 23 is abundant when the aperture of expansion valve 24 is too small, but to indoor heat converter 41a, 41b Heating capacity excessively limit, therefore no longer can fully obtain using with accumulation of heat using operating defrosting operating heated This advantage of operating.

So, here, in the case of only carrying out heating operation, indoor control unit 48a, 48b determine indoor expansion valve The aperture of 41a, 41b, and outside control unit 38 determines the aperture of outdoor expansion valve 24, but utilizing operating with accumulation of heat In the case of carrying out heating operation in defrosting operating, outside control unit 38 not only determines the aperture of outdoor expansion valve 24, and Also determine that the aperture of indoor expansion valve 41a, 41b.

Therefore, in the case of carrying out heating operation in accumulation of heat using the defrosting operating operating, outside control unit 38 it is contemplated that the balance of the heating capacity of the defrosting ability of outdoor heat converter 24 and indoor heat converter 42a, 42b, with The comprehensive determination aperture of outdoor expansion valve 24 and the aperture of indoor expansion valve 41a, 41b.

Thus, here, first with accumulation of heat using operating defrosting operating in carry out heating operation in the case of, can Suitably determine the aperture of indoor expansion valve 41a, 41b and outdoor expansion valve 24.

In addition, in the case of carrying out heating operation in accumulation of heat using the defrosting operating operating, needing reliably true Protect the heating capacity of indoor heat converter 42a, 42b, and it needs to be determined that the aperture of indoor expansion valve 41a, 41b.But, in room In the case that outside control unit 38 determines the aperture of indoor expansion valve 41a, 41b, it is difficult in view of will be single to outdoor unit 2 and interior System in the refrigerant pipe (here, mainly liquid refrigerant communicating pipe 6 and gas refrigerant communicating pipe 7) that first 4a, 4b connect The impact of the pressure loss of cryogen etc..And, carry out the situation of heating operation in accumulation of heat using the defrosting operating operating Under, in order to reliably terminate the defrosting of outdoor heat converter 23 it is also desirable to increase the defrosting ability of outdoor heat converter 23.

So, here, starting to play till the first defrosting time taj from defrosting operating, based on refrigerant loop 10 In the air adjustment object space of condensation temperature Tc of cold-producing medium and indoor unit 4a, 4b indoor temperature Tra, Trb (general name For Tr) dependency relation, determine the aperture of indoor expansion valve 41a, 41b.In addition, have passed through first starting from defrosting operating After defrosting time taj, to reduce the heating capacity of indoor heat converter 42a, 42b and to increase the defrosting of outdoor heat converter 24 The mode of ability changes indoor expansion valve 41a, 41b and the aperture of outdoor expansion valve 24.

Specifically, here, according to step ST1 shown in the flow chart of Fig. 8～ST5, is determined using outside control unit 38 Indoor expansion valve 41a, 41b and the aperture of outdoor expansion valve 24.

First, the accumulation of heat operating in heating operation and accumulation of heat operating terminate after heating operation terminate and proceed by and remove During frost operating (with accumulation of heat using the defrosting operating operating), in step ST1, the aperture of indoor expansion valve 41a, 41b is set Surely become initial stage aperture MVrd1 during defrosting operating, and the aperture of outdoor expansion valve 24 is set to initial stage during defrosting operating Aperture MVod1.Here, utilizing outside control unit 38 to determine aperture and the outdoor of indoor expansion valve 41a, 41b as described above The aperture of expansion valve 24.

And, in the case that defrosting operating meets and heats/defrost and preferentially start condition, the process via step ST2 turns Move on to the process of step ST3～ST5, proceed by the aperture to indoor expansion valve 41a, 41b and the aperture of outdoor expansion valve 24 The control being determined, heats preferential operating or makes the preferential operating of defrosting to enter to exercise.Here, heat/defrost preferentially opening Beginning condition is for by changing the aperture of indoor expansion valve 41a, 41b and the aperture of outdoor expansion valve 24, determining whether to be in Allow the state heating preferential operating into enforcement and making the preferential operating of defrosting.And, here, from the beginning of defrosting operating Play time tdef1 and condensation temperature Tc that have passed through regulation within the second defrosting time tah and from defrosting operating starts The threshold temperature Trdef being less than the regulation obtaining according to indoor temperature Tr is (after so that indoor temperature Tr is added with the temperature of regulation The value obtaining) in the case of, meet and heat/defrost the condition that preferentially starts.Here, the second defrosting time tah is from defrosting operating Start the time heating preferential operating or making the preferential operating of defrosting into enforcement.In addition, time tdef1 is from defrosting operating Start to play and translate into the waiting time making to heat preferential operating or making till the preferential operating of defrosting, be than the second defrosting when Between tah short a lot of time.

Then, in the case that the defrosting operating transferring to step ST3 from step ST2 meets and heats priority condition, transfer To the process of step ST4, carry out the control that the aperture of the aperture to indoor expansion valve 41a, 41b and outdoor expansion valve 24 is determined System, heats preferential operating to enter to exercise.Here, heating priority condition is not guarantee indoor heat exchange for determining whether to be in The condition of the state of the heating capacity of device 42a, 42b.And, here, in the first defrosting time taj starting from defrosting operating Have passed through within (time shorter than the second defrosting time tah) and from the transfer to step ST3 regulation time tdef2 and Condensation temperature Tc is less than the threshold temperature Trdef being obtained according to indoor temperature Tr (under the conditions of preferentially starting with above-mentioned heating/defrost Threshold temperature Trdef identical) in the case of, meet heat priority condition.Here, time tdef2 is for maintaining step ST3 The waiting time of aperture hold mode.And, in the case that when carrying out the process of step ST3, satisfaction heats priority condition, Transfer to the process of step ST4, increase the aperture (increasing aperture Δ MVrd2 at this) of indoor expansion valve 41a, 41b, and subtract The aperture (reducing aperture Δ MVod2 at this) of little outdoor expansion valve 24, returns to the process of step ST3.Here, as described above It is made whether that satisfaction heats the judgement of priority condition (comprising the judgement being carried out by threshold temperature Trdef) using outside control unit 38 And the determination of the aperture of the aperture of indoor expansion valve 41a, 41b and outdoor expansion valve 24.That is, here, from the beginning of defrosting operating Rise till have passed through the first defrosting time taj (initial stage of defrosting operating), related to indoor temperature Tr based on condensation temperature Tc Relation, suitably determines the aperture of indoor expansion valve 41a, 41b.By this step ST3 being repeated, heating priority condition Judgement and the process of step ST4, as shown in figure 9, can start to play till the first defrosting time taj from defrosting operating (that is, at the initial stage of defrosting operating), the aperture of increase indoor expansion valve 41a, 41b, and reduce the aperture of outdoor expansion valve 24, Preferentially guarantee the heating capacity of indoor heat converter 42a, 42b, and carry out defrosting operating.

Then, in the case that the defrosting operating transferring to step ST3 from step ST2 meets defrosting priority condition, transfer To the process of step ST5, carry out the control that the aperture of the aperture to indoor expansion valve 41a, 41b and outdoor expansion valve 24 is determined System, to enter to exercise the preferential operating of defrosting.Here, defrosting priority condition is not guarantee outdoor heat exchange for determining whether to be in The condition of the state of the ability of the defrosting of device 23.And, here, starting from defrosting operating through first defrosting during taj, And from the transfer to step ST3 through regulation time tdef3 and outdoor heat converter 23 outlet cold-producing medium temperature Degree, i.e. outdoor heat hand over defrosting operating medium temperature Tdefm that outlet temperature Tol2 is less than regulation (for whether judging defrosting operating The temperature of below the defrosting operating end temp Tdefe finishing) in the case of, meet defrosting priority condition.Here, the time Tdef3 is the waiting time of the aperture hold mode for maintaining step ST3.And, when full when carrying out the process of step ST3 In the case of foot defrosting priority condition, transfer to the process of step ST5, reduce indoor expansion valve 41a, 41b aperture (here, Only reduce aperture Δ MVrd3), and increase the aperture (here, only increasing aperture Δ MVod3) of outdoor expansion valve 24, return to step The process of rapid ST3.Here, as described above using outside control unit 38 be made whether meet defrosting priority condition judgement and The determination of the aperture of the aperture of indoor expansion valve 41a, 41b and outdoor expansion valve 24.That is, here, starting from defrosting operating After have passed through the first defrosting time taj (that is, make heat preferential defrosting operating terminate after), outlet temperature is handed over based on outdoor heat Tol2 suitably determines the aperture of indoor expansion valve 41a, 41b.By this step ST3 is repeated, defrost priority condition Judgement and the process of step ST5, as shown in figure 9, after have passed through the first defrosting time taj from defrosting operating starting, subtract The aperture of little indoor expansion valve 41a, 41b, and increase the aperture of outdoor expansion valve 24, reduce indoor heat converter 42a, 42b Heating capacity, and increase the defrosting ability of outdoor heat converter 23, so as to make from making to heat preferential operating to translate into Defrost preferential operating.

Then, the defrosting operating transferring to step ST3 from step ST2 (also comprises to make to heat preferential operating and makes defrosting Preferential operating) have passed through tah during the second defrosting from defrosting operating starting in the case of, return to the process of step ST1, Make the aperture of indoor expansion valve 41a, 41b return into initial stage aperture MVrd1 during defrosting operating, and make outdoor expansion valve 24 Aperture returns into initial stage aperture MVod1 during defrosting operating.Therefore, with the indoor expansion being carried out by the process of step ST4, ST5 The change of the aperture of the aperture of valve 41a, 41b and outdoor expansion valve 24 is compared, and can strongly reduce indoor expansion valve 41a, 41b Aperture, and the aperture of outdoor expansion valve 24 can be increased dramatically, therefore, it is possible to promote further to make the preferential operating of defrosting, Zhi Daoyin Reach more than the defrosting operating end temp Tdefe or the defrosting operating end time tdefe through regulation of regulation and terminate Such that it is able to reliably terminate the defrosting of outdoor heat converter 23 till defrosting operating.

(4) variation 1

In the above-described embodiment, constitute refrigerant loop 10 equipment and from heat-storing material scattering losses to removing Time needed for frost produces impact, and the required time of therefore defrosting is in the lower and longer tendency of outdoor temperature Ta.Therefore, manage Think, determine time, i.e. the first defrosting time taj heating preferential operating into enforcement also based on outdoor temperature Ta.

So, here, the first defrosting time taj is determined based on outdoor temperature Ta.

Specifically, first, the second defrosting time tah is defined as that outdoor temperature Ta shown in following formulas 1 Function.

Tah=Ta+tah0 ... (formula 1)

Here, tah is the reference value of the second defrosting time tah.Using formula 1, outdoor temperature Ta is lower, during the second defrosting Between tah shorter.Thus, the time of the preferential operating of the defrosting making to be carried out by above-mentioned step ST3, ST5 of defrosting operating shortens, It is set to the aperture (=MVrd1) of indoor expansion valve 41a, 41b in above-mentioned step ST1 and the aperture of outdoor expansion valve 24 The time of the operating (from playing till defrosting operating terminates through the second defrosting time tah) of (=MVod1) is elongated.

And, determine the first defrosting time taj using the second defrosting time tah and formula 2 being determined by formula 1.

Taj=tah tah1 ... (formula 2)

Here, tah1 is equivalent to the time of the preferential operating that defrosts being carried out into enforcement by above-mentioned step ST3, ST5.Adopt With formula 1,2, outdoor temperature Ta is lower, and the first defrosting time taj is shorter.Thus, the making by above-mentioned step of defrosting operating What ST3, ST4 were carried out heats the time shortening of preferential operating.

Thus, here, by determining the first defrosting time heating preferential operating into enforcement based on outdoor temperature Ta Taj, can extend into and exercise the preferential operating of defrosting, reliably terminate the defrosting of outdoor heat converter 23.

In addition, here, the first defrosting time taj is not only determined based on outdoor temperature Ta, and when also determining that the second defrosting Between tah but it is also possible to the first defrosting time taj is only determined based on outdoor temperature Ta.

(5) variation 2

In above-mentioned embodiment and variation 1, carry out heating fortune in accumulation of heat using the defrosting operating operating Turn.And, in this case, when the aperture of indoor expansion valve 41a, 41b becomes too much, indoor heat converter 42a, 42b The cold-producing medium in exit easily become gas-liquid two-phase state.So, by the outlet side of indoor heat converter 42a, 42b The system that (hydraulic fluid side) and the entrance side (hydraulic fluid side) as the heat-storage heat exchanger 28 of the vaporizer function of cold-producing medium connect In refrigerant tube (here is liquid refrigerant communicating pipe 6 etc.), the cold-producing medium of easy gassy state.Here, in such as cold-producing medium Loop 10 does not play work(in the outlet side (hydraulic fluid side) using indoor heat converter 42a, 42b with as the vaporizer of cold-producing medium like that Can the part setting receptor that connects of entrance side (hydraulic fluid side) of heat-storage heat exchanger 28 in the case of it may occur however that liquid system Cryogen returns to the so-called liquid backflow in compressor 21 via heat-storage heat exchanger 28.And, when there is liquid backflow, from The tendency reducing in degree of superheat SHd of the cold-producing medium discharged in compressor 21.

So, here, degree of superheat SHd based on the cold-producing medium discharged from compressor 21 for the outdoor control unit 38, judge because The aperture of indoor expansion valve 41a, 41b becomes too much and so that liquid is flowed back and occur.Here, examining according to by discharge pressure sensor 32 Discharge pressure Pd measured and discharge temperature Td being detected by discharge temperature sensor 34, calculate and discharge from compressor 21 Cold-producing medium the degree of superheat.More specifically, first discharge pressure Pd is converted into the saturation temperature of cold-producing medium and obtains condensation Temperature Tc.And, obtain degree of superheat SHd by deducting condensation temperature Tc from discharge temperature Td.

Specifically, here as shown in Figure 10, in the control in above-mentioned defrosting operating, is less than threshold in degree of superheat SHd In the case of the degree of superheat, outdoor control unit 24 judges to there occurs that liquid flows back.And, as needed reduce indoor expansion valve 41a, The aperture of 41b.

First, for transferring to the condition of step ST2, that is, heating/defrost and preferentially start condition from step ST1, enter The condition more than first threshold degree of superheat SHd1 that one step is regulation plus degree of superheat SHd, is used as transferring to from step ST1 The condition of step ST2.Thus, when carrying out the process of step ST1, i.e. the aperture of indoor expansion valve 41a, 41b is being set to Initial stage aperture MVrd1, and the aperture of outdoor expansion valve 24 is set in the state of initial stage aperture MVod1, it is prevented from shifting Become too much to the aperture that may make indoor expansion valve 41a, 41b and heat preferential operating (process of step ST3, ST4).

In addition, when carrying out the process of step ST1, starting from defrosting operating through regulation time tdef4 (from removing The waiting time transferred to till next process is played in white operation start), and degree of superheat SHd is less than the 3rd threshold mistake of regulation In the case of temperature SHd3, judge to there occurs that liquid flows back in compressor 21, transfer to the process of step ST6.Here, the 3rd Threshold degree of superheat SHd3 is set to the value less than first threshold degree of superheat SHd1.And, in step ST6, indoor expansion valve 41a, 41b Aperture be set to liquid backflow eliminate aperture MVrd4 (less than the aperture of initial stage aperture MVrd1), the aperture of outdoor expansion valve 24 It is set to that liquid backflow eliminates aperture MVod4 (here is and initial stage aperture MVod1 identical aperture).Thus, by compressor 21 In liquid backflow eliminate.And, by compressor 21 liquid backflow eliminate and degree of superheat SHd reached regulation the 3rd In the case of more than threshold degree of superheat SHd3, carry out the process of step ST1 again, i.e. be returned as indoor expansion valve 41a, 41b Aperture is set to initial stage aperture MVrd1 and the aperture of outdoor expansion valve 24 is set to the state of initial stage aperture MVod1.

Additionally, when carrying out the process of step ST2～ST5, become less than the second threshold degree of superheat of regulation in degree of superheat SHd In the case of SHd2, judge liquid backflow in compressor 21, even if without the second defrosting from defrosting operating starts Time tah, the process of interrupt step ST2～ST5, carry out the process of step ST1, i.e. be returned as indoor expansion valve 41a, 41b Aperture be set to initial stage aperture MVrd1 and the aperture of outdoor expansion valve 24 be set to the state of initial stage aperture MVod1.By This, the liquid backflow in compressor 21 is eliminated.

Thus, here, indoor expansion valve can suitably be judged with accumulation of heat using in the defrosting operating operating Whether the aperture of 41a, 41b becomes too much, carries out heating operation.

Industrial applicibility

The present invention can be widely used in a kind of air-conditioning device, and this air-conditioning device includes refrigerant loop, this refrigeration Agent loop has the heat-storage heat exchanger carrying out heat exchange between cold-producing medium and heat-storing material, and this air-conditioning device carries out accumulation of heat fortune Turn, and accumulation of heat can be carried out in defrosting operating using operating and heating operation simultaneously, wherein above-mentioned accumulation of heat operating refers to by making Heat-storage heat exchanger carries out the operating of accumulation of heat as the radiator function of cold-producing medium to heat-storing material, and above-mentioned accumulation of heat utilizes Operating refers to be radiated from heat-storing material as the vaporizer function of cold-producing medium by making heat-storage heat exchanger Operating.

(symbol description)

1 ... air-conditioning device；

2 ... outdoor units；

4a, 4b ... indoor unit；

10 ... refrigerant loops；

21 ... compressors；

23 ... outdoor heat converters；

24 ... outdoor expansion valves；

28 ... heat-storage heat exchangers；

38 ... outside control units；

41a, 41b ... indoor expansion valve；

42a, 42b ... indoor heat converter；

48a, 48b ... indoor control unit.

Prior art literature

Patent documentation

Patent documentation 1：2005 No. 337657 publications of Japanese Unexamined Patent Publication

Claims

1. a kind of air-conditioning device (1), including refrigerant loop (10), this refrigerant loop (10) has compressor (21), outdoor Heat exchanger (23), indoor heat converter (42a, 42b) and heat-storage heat exchanger (28), this heat-storage heat exchanger (28) is in refrigeration Carry out heat exchange between agent and heat-storing material,

Described this air-conditioning device (1) carries out accumulation of heat operating, and can carry out in defrosting operating simultaneously accumulation of heat using operating and heat Operating, wherein, described accumulation of heat operating refers to play work(by making described heat-storage heat exchanger as the radiator of described cold-producing medium Can and carry out the operating of accumulation of heat to described heat-storing material, described defrosting operating refers to be used as institute by making described outdoor heat converter State the radiator function of cold-producing medium and carry out the operating of the defrosting of described outdoor heat converter, described accumulation of heat using operating is Refer to carry out from described heat-storing material as the vaporizer function of described cold-producing medium by making described heat-storage heat exchanger The operating of radiating, described heating operation is the radiator function instigating described indoor heat converter as described cold-producing medium Operating,

Described air-conditioning device is characterised by,

Described refrigerant loop also has：

Indoor expansion valve (41a, 41b), this indoor expansion valve (41a, 41b) is used for flowing in described indoor heat converter The flow of described cold-producing medium is changed；And

Outdoor expansion valve (24), this outdoor expansion valve (24) is used for the described cold-producing medium to flowing in described outdoor heat converter Flow be changed,

Described indoor heat converter and described indoor expansion valve located at indoor unit (4a, 4b),

Described indoor unit has indoor control unit (48a, 48b), in the case of only carrying out described heating operation, described room Inner side control unit (48a, 48b) determines the aperture of described indoor expansion valve,

Described outdoor heat converter and described outdoor expansion valve located at outdoor unit (2),

Described outdoor unit has outside control unit (38), in the case of only carrying out described heating operation, described outside Control unit (38) determines the aperture of described outdoor expansion valve, when with described accumulation of heat using operating described defrosting operating in enter In the case of the described heating operation of row, described outside control unit (38) determines the aperture of described indoor expansion valve and described outdoor The aperture of expansion valve,

In the case of carrying out described heating operation in described accumulation of heat using the described defrosting operating operating, remove from described White operation start is played till the first defrosting time, if the condensation temperature of the described cold-producing medium in described refrigerant circuit (10) (Tc) it is less than the threshold temperature that the indoor temperature (Tr) of the air adjustment object space according to described indoor unit (4a, 4b) obtains (Trdef) it is determined that the aperture of described indoor expansion valve (41a, 41b),

Have passed through described first defrosting time from described defrosting operating starting after, the described indoor expansion valve of change (41a, 41b) and described outdoor expansion valve (24) aperture so that described indoor heat converter (42a, 42b) heating capacity reduce, and The defrosting ability of described outdoor heat converter (23) is made to improve.

2. air-conditioning device (1) as claimed in claim 1 it is characterised in that

Based on the outdoor temperature of the space outerpace configuring for described outdoor unit (2), determine described first defrosting time.

3. a kind of air-conditioning device (1), including refrigerant loop (10), this refrigerant loop (10) has compressor (21), outdoor Heat exchanger (23), indoor heat converter (42a, 42b) and heat-storage heat exchanger (28), this heat-storage heat exchanger (28) is in refrigeration Carry out heat exchange between agent and heat-storing material,

Described air-conditioning device is characterised by,

Described refrigerant loop also has：

In described defrosting operating, based on the degree of superheat of the described cold-producing medium discharged from described compressor (21), judge described Whether the aperture of indoor expansion valve (41a, 41b) becomes too much.

4. air-conditioning device (1) as claimed in claim 3 it is characterised in that