CN201028884Y - Multi-connected air conditioning unit capable of refrigerating, heating and heating water simultaneously - Google Patents
Multi-connected air conditioning unit capable of refrigerating, heating and heating water simultaneously Download PDFInfo
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- CN201028884Y CN201028884Y CNU2007200515126U CN200720051512U CN201028884Y CN 201028884 Y CN201028884 Y CN 201028884Y CN U2007200515126 U CNU2007200515126 U CN U2007200515126U CN 200720051512 U CN200720051512 U CN 200720051512U CN 201028884 Y CN201028884 Y CN 201028884Y
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- 238000010438 heat treatment Methods 0.000 title abstract description 15
- 238000004378 air conditioning Methods 0.000 title abstract description 5
- 239000008236 heating water Substances 0.000 title abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000007788 liquid Substances 0.000 claims abstract description 42
- 239000002826 coolant Substances 0.000 claims description 29
- 238000005057 refrigeration Methods 0.000 abstract description 23
- 239000003507 refrigerant Substances 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 10
- 230000008020 evaporation Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The utility model provides a can refrigerate simultaneously, heat and system hydrothermal many air conditioning unit that ally oneself with. The multi-connected air conditioner unit comprises an outdoor unit, a refrigerant distributor and an indoor unit, wherein the outdoor unit, the refrigerant distributor and the indoor unit form a completed circulating system through connecting pipelines, the indoor unit comprises an indoor unit and a water tank, the refrigerant distributor comprises a high-pressure gas-liquid separator, an electronic expansion valve A, an electronic expansion valve B and four-way valves corresponding to the indoor unit and the water tank, and the purposes of refrigerating, heating and heating water of the unit at the same time are achieved by controlling the flow direction of each four-way valve. In addition, through accurate control of flow distribution, refrigeration and heating can be realized simultaneously when the outdoor temperature is in the range of-5 ℃ to 30 ℃, and in addition, hot water can be provided when the outdoor temperature is higher than-7 ℃, so that the maximum energy-saving effect is realized.
Description
Technical field
The utility model relates to air-conditioning technical field, particularly a kind of combined air conditioners unit that can freeze, heat and heat water simultaneously.
Background technology
The combined air conditioners unit that can freeze, heat and heat water simultaneously described in the utility model is meant that in a coolant circulating system indoor units can be selected refrigeration and heating mode arbitrarily, realizes refrigeration simultaneously, heats and heat water function.Its basic principle is that the energy efficient of outside heat exchange is transferred to the indoor, and is used, and reaches the purpose that energy reclaims.For the described combined air conditioners unit that freezes simultaneously, heats and heat water, when indoor refrigeration with heat load suitable the time, the outside stops heat exchange, energy reclaims fully, compressor is as long as output is equivalent to the ability of freezing or heating, just can both export refrigerating capacity cooling room air, can provide heating capacity to be used to heat room air again or hot water is provided, reach the effect of getting twice the result with half the effort.
Along with the progress of society and improving constantly of living standards of the people, people require also constantly to improve to the comfortableness of life, occur much needing indoor units to freeze, heat and heat the occasion of water simultaneously.For example: (1) modern building needs the occasion of cooling and heat supply simultaneously.Because there are very big-difference in the sunny side of building and the solar radiation that the back is subjected to, make the room of sunny side need refrigeration, and the room of the corresponding back need heat, and needs hot water for shower bath simultaneously; (2) transition season is to the needs of air conditioning, because the difference of human body comfort and indoor environment is different, the user of air-conditioning has the demand that needs to freeze, heat and heat water simultaneously.(3) cryogenic refrigeration.The general air-flow of modern office buildings is airtight, and because even the use of solar irradiation, indoor occupant, computer, illumination and other office equipment in winter, also has the room to need refrigeration.The patent that the unit of relevant recuperation of heat is also arranged now, in the existing technology, system connects complicated, and system's control is loaded down with trivial details, need develop a kind of system and connect the combined air conditioners unit that simply can freeze, heat and heat water simultaneously.
The utility model content
The purpose of this utility model provides a kind of combined air conditioners unit that can freeze, heat and heat water simultaneously.
The purpose of this utility model is achieved by the following technical solution:
Can freeze simultaneously, heat and heat the combined air conditioners unit of water, comprise outdoor unit, coolant distributor and indoor units, described outdoor unit, coolant distributor and indoor units are formed the complete circulatory system by connecting line, described outdoor unit comprises at least one compressor, outdoor heat exchanger, outdoor cross valve, indoor units comprises at least two indoor sets, a water tank reaches and described indoor set, the electric expansion valve that water tank connects, each indoor set, be connected in parallel between the water tank, described outdoor unit also comprises four check valves, described coolant distributor comprises high-pressure gas-liquid separator, electric expansion valve A, electric expansion valve B, with indoor set, the corresponding cross valve of water tank, first interface of described high-pressure gas-liquid separator is connected with the cold-producing medium outflow end of second check valve, the cold-producing medium of second check valve flows into end and is connected with the normally closed port of outdoor cross valve, the air inlet of the cross valve in second interface of described high-pressure gas-liquid separator and the coolant distributor is connected, the 3rd interface of described high-pressure gas-liquid separator is connected with electric expansion valve A, the other end of electric expansion valve A is connected with indoor units, the end of described electric expansion valve B is connected with indoor units, the gas outlet of the cross valve in the other end and the coolant distributor is connected, normal ported with the corresponding indoor set of cross valve or water tank connect in the described coolant distributor, connect by capillary between normally closed port and the gas outlet, the cold-producing medium outflow end of described first check valve is connected with the normally closed port of outdoor cross valve, the gas outlet that cold-producing medium flows into the cross valve in end and the coolant distributor is connected, the gas outlet that the 3rd check valve cold-producing medium flows into the cross valve in end and the coolant distributor is connected, the cold-producing medium outflow end is connected with outdoor heat exchanger, the cold-producing medium outflow end of the 4th check valve is connected with first interface of high-pressure gas-liquid separator, cold-producing medium flows into end and is connected with outdoor heat exchanger, normal ported connection of outdoor heat exchanger opposite side and outdoor cross valve.
Its second is characterised in that: also be connected to an oil eliminator between the exhaust outlet of described compressor and the air inlet of outdoor cross valve.
Its 3rd is characterised in that: the air entry of described compressor and and the outlet of outdoor cross valve between also be connected to a gas-liquid separator.
Its 4th is characterised in that: the pipeline between the air inlet of described oil eliminator and outdoor cross valve is provided with high pressure sensor.
Its 5th is characterised in that: the pipeline between the gas outlet of described gas-liquid separator and outdoor cross valve is provided with low pressure sensor.
The utility model is connected to become the thermodynamic cycle loop of a sealing by adopting coolant distributor with outdoor unit and indoor units, by controlling the flow direction of each cross valve, reaches the purpose that water is freezed, heats and heated to indoor units simultaneously.In addition,,, can realize freezing simultaneously, heating and heat water, realize maximized energy-saving effect in the scope of outdoor temperature at-5 ℃ to 30 ℃ by accurate control assignment of traffic.
In unit control, adopt the thought of optimization control, make compressor capacity accurately regulate, at any time can both be complementary and reach optimum with system requirements.The flow of two electronic expansion valve regulation cold-producing mediums in the coolant distributor has been expanded the scope and the precision of regulating.
Description of drawings:
Fig. 1 is the connection diagram of the utility model first embodiment;
The specific embodiment
First embodiment
Can freeze simultaneously as shown in Figure 1, heat and heat the combined air conditioners unit of water, comprise outdoor unit 30, coolant distributor 40 and indoor units 50, described outdoor unit 30, coolant distributor 40 and indoor units 50 are formed the complete circulatory system by connecting line, described outdoor unit 30 comprises at least one compressor 1, outdoor heat exchanger 3, outdoor cross valve 2, indoor units 50 comprises at least two indoor sets, a water tank reaches and described indoor set, the electric expansion valve that water tank connects, be connected in parallel between each indoor set, in the utility model: described outdoor unit 30 also comprises four check valves, described coolant distributor 40 comprises high-pressure gas-liquid separator 15, electric expansion valve A, electric expansion valve B, with indoor set, the corresponding cross valve of water tank, first interface of described high-pressure gas-liquid separator 15 has connected the cold-producing medium outflow end of second check valve 5, the cold-producing medium of second check valve 5 flows into end and is connected with the normally closed port of outdoor cross valve 2, the air inlet of the cross valve in second interface of described high-pressure gas-liquid separator 15 and the coolant distributor 40 is connected, the 3rd interface of described high-pressure gas-liquid separator 15 is connected with electric expansion valve A, the other end of electric expansion valve A is connected with indoor units, the end of described electric expansion valve B is connected with indoor units, the gas outlet of the cross valve in the other end and the coolant distributor 40 is connected, normal ported with the corresponding indoor set of cross valve or water tank connect in the described coolant distributor 40, connect by capillary between normally closed port and the gas outlet, the cold-producing medium outflow end of described first check valve 4 is connected with the normally closed port of outdoor cross valve 2, the gas outlet that cold-producing medium flows into the cross valve in end and the coolant distributor 40 is connected, the gas outlet that the cold-producing medium of the 3rd check valve 6 flows into the cross valve in end and the coolant distributor 40 is connected, the cold-producing medium outflow end is connected with outdoor heat exchanger 3, the 4th check valve 7 cold-producing medium outflow ends are connected with first interface of high-pressure gas-liquid separator 15, cold-producing medium flows into end and is connected with outdoor heat exchanger 3, normal ported connection of the opposite side of outdoor heat exchanger 3 and outdoor cross valve 2.
In the present embodiment, also be connected to an oil eliminator 8 between the exhaust outlet of compressor 1 and outdoor cross valve 2 air inlets, the pipeline between described oil eliminator 8 and outdoor cross valve 2 air inlets is provided with high pressure sensor 11; The air entry of compressor 1 and and the gas outlet of outdoor cross valve 2 between also be connected to a gas-liquid separator 9, the pipeline between the gas outlet of described gas-liquid separator 9 and outdoor cross valve 2 is provided with low pressure sensor 10.
Further instruction, indoor set has two in the present embodiment, one in water tank, be respectively first indoor set 16, second indoor set 18, water tank 20, they are connected with first electric expansion valve 17, second electric expansion valve 19, the 3rd electric expansion valve 21 respectively, the other end of above-mentioned electric expansion valve connects electric expansion valve A and the electric expansion valve B in the coolant distributor 40 simultaneously, and corresponding, there are first cross valve 12, second cross valve 13, the 3rd cross valve 14 to be connected with water tank with above-mentioned indoor set respectively in the coolant distributor 40.
Introduce the control method of the present utility model and the course of work below.
The described combined air conditioners unit that can freeze, heat and heat water simultaneously has 5 kinds of operational modes altogether, be respectively freeze (indoor set refrigeration, water tank do not work), heat fully (indoor set heats with water tank and heats water), main body refrigeration (cooling load is greater than heating load) fully, main body heats (heating load greater than cooling load) and recuperation of heat (cooling load equals to heat load) pattern.
When the indoor units cooling load greater than heating when load, outdoor cross valve outage; Heat when load when the indoor units cooling load is less than or equal to, outdoor cross valve powers on.
When the indoor units cooling load when heating load, electric expansion valve A opens, electric expansion valve B closes; When the indoor units cooling load when heating load, electric expansion valve A closes, electric expansion valve B opens; When the indoor units cooling load equaled to heat load, electric expansion valve A closed, and electric expansion valve B closes.
When indoor set was in refrigeration or removes wet condition, the cross valve that is attached thereto was in power-up state, and when indoor set is in when heating state, the cross valve that is attached thereto is in off-position.When water tank heated water, the cross valve that is attached thereto was in off-position, and when water tank did not heat water, the cross valve that is attached thereto was in power-up state.Wherein the state that powers on of cross valve is: the cross valve air inlet is communicated with normally closed port, cross valve gas outlet and normal ported the connection; The state of cross valve outage is: the cross valve air inlet is communicated with normally closed port with normal ported connection the, cross valve gas outlet.
Serve as theme with the indoor units operational mode below and describe the ruuning situation of unit one by one.
1, complete refrigeration mode
Under this pattern, all or part of refrigeration (dehumidifying) pattern that is in of indoor units, now with first and second indoor set refrigeration, water tank cuts out to example and makes an explanation.
Under this pattern, outdoor cross valve 2 outages, first cross valve 12 powers on, second cross valve 13 powers on, and the 3rd cross valve 14 powers on, and electric expansion valve A opens, electric expansion valve B closes, the-electric expansion valve 17, second electric expansion valve 19 are opened, and the 3rd electric expansion valve 21 is closed, and the glide path of cold-producing medium is:
Compressor 1 exhaust outlet---outdoor cross valve 2---outdoor heat exchanger 3---the 4th check valve 7---high-pressure gas-liquid separator 15---electric expansion valve A, after this cold-producing medium is divided into two-way and enters two indoor sets, and one the road flows to and is: first electric expansion valve 17---first indoor set 16---first cross valve 12---, first check valve 4; Another road flows to: second electric expansion valve 19---second indoor set 18---second cross valve 13---, first check valve 4, the two-way cold-producing medium is at last all through first check valve 4, outdoor cross valve 2, behind gas-liquid separator 9, sucked then, after overcompression, participate in circulation next time by compressor 1 air entry.
2, complete heating mode
Under this pattern, all or part of heating mode that is in of indoor units heats with first and second indoor set now, and it is that example makes an explanation that water tank heats water.
Under this pattern, outdoor cross valve 2 powers on, first cross valve 12, second cross valve 13,14 outages of the 3rd cross valve, electric expansion valve A closes, electric expansion valve B opens, first electric expansion valve 17, second electric expansion valve 19, the 3rd electric expansion valve 21 are opened, and the glide path of cold-producing medium is:
Compressor 1---outdoor cross valve 2---second check valve 5---high-pressure gas-liquid separator 15, this moment, high-temperature high-pressure refrigerant gas flowed out from second interface of high-pressure gas-liquid separator 15, be divided into three the tunnel then and enter indoor units, the first via flows to and is: first cross valve 12---first indoor set 16---first electric expansion valve 17---electric expansion valve B; The second tunnel flow direction is: second cross valve 13---second indoor set 18---second electric expansion valve 19---electric expansion valve B; Third Road flows to: the 3rd cross valve 14---water tank 20---the 3rd electric expansion valve 21---electric expansion valve B; Three road cold-producing mediums at last all through electric expansion valve B throttling, through the 3rd check valve 6 after in outdoor heat exchanger 3 evaporation, through outdoor cross valve 2, gas-liquid separator 9 after, sucked then by compressor 1 air entry, after overcompression, participate in circulating next time.
3, main body refrigeration
Under this pattern, the load of indoor units refrigeration (dehumidifying) interior machine freezes with first and second indoor set now greater than the load that heats interior machine, and water tank heats to example and makes an explanation.
Under this pattern, outdoor cross valve 2 outages, first cross valve 12 powers on, second cross valve 13 powers on, 14 outages of the 3rd cross valve, electric expansion valve A opens, and electric expansion valve B closes, first electric expansion valve 17, second electric expansion valve 19, the 3rd electric expansion valve 21 are opened, and the glide path of cold-producing medium is:
Compressor 1 exhaust outlet---outdoor cross valve 2---outdoor heat exchanger 3---the 4th check valve 7---high-pressure gas-liquid separator 15, cold-producing medium in the high-pressure gas-liquid separator 15 is in the gas-liquid mixed state at this moment, gaseous refrigerant flows out from second interface of high-pressure gas-liquid separator 15 and is used for indoor units and heats, liquid refrigerant is used for the indoor units refrigeration from the 3rd interface outflow of high-pressure gas-liquid separator 15, gaseous refrigerant flows to: the 3rd cross valve 14---water tank 20---the 3rd electric expansion valve 21, mix the indoor set that flows into refrigeration with the liquid refrigerant that participates in refrigeration after the throttling, flow back to compressor at last together; Liquid refrigerant is divided into two-way and enters two indoor set evaporations after electric expansion valve A throttling, one tunnel flow direction is: first electric expansion valve 17---first indoor set 16---first cross valve 12---, first check valve 4; Another road flows to: second electric expansion valve 19---second indoor set 18---second cross valve 13---, first check valve 4, gaseous refrigerant after the evaporation is at last all through the first check valve 4 outdoor cross valve 2 of flowing through, behind gas-liquid separator 9, sucked then, after overcompression, participate in circulation next time by compressor 1 air entry.
4, main body heats
Under this pattern, the load of machine heated with first indoor set now greater than the interior machine load of refrigeration (dehumidifying) in indoor units heated, and water tank system heats water, second indoor set refrigeration makes an explanation for example.
Under this pattern, outdoor cross valve 2 powers on, 12 outages of first cross valve, second cross valve 13 powers on, 14 outages of the 3rd cross valve, electric expansion valve A closes, and electric expansion valve B opens, first electric expansion valve 17, second electric expansion valve 19, the 3rd electric expansion valve 21 are opened, and the glide path of cold-producing medium is:
Compressor 1 exhaust outlet---outdoor cross valve 2---second check valve 5---high-pressure gas-liquid separator 15, this moment, high-temperature high-pressure refrigerant gas flowed out from second interface of high-pressure gas-liquid separator 15, being divided into two-way then enters first indoor set 16 and water tank 20, a road and flows to and be: 17 throttlings of first cross valve 12---first indoor set 16---, first electric expansion valve; Another road flows to: 21 throttlings of the 3rd cross valve 14---water tank 20---the 3rd electric expansion valve, and the two-way refrigerant mixed, a part is---second indoor set 18---second cross valve 13---the 3rd check valve 6 through 19 throttlings of second electric expansion valve; Another part cold-producing medium is through electric expansion valve B throttling---the 3rd check valve 6, last two parts cold-producing medium mix once more through outdoor heat exchanger 3---outdoor cross valve 2---gas-liquid separator 9 after compressor 1 air entry that coexists be inhaled into, after overcompression, participate in circulating next time.
5, heat recovery mode---refrigeration (dehumidifying) load equals to heat load
Under this pattern, machine load in the load of indoor set refrigeration (dehumidifying) interior machine equals to heat heats with first indoor set 16 now, second indoor set, 18 refrigeration, and it is that example makes an explanation that water tank 20 does not heat water.
Under this pattern, outdoor cross valve 2 powers on, 12 outages of first cross valve, second cross valve 13 powers on, and the 3rd cross valve 14 powers on, and electric expansion valve A closes, electric expansion valve B closes, first electric expansion valve 17, second electric expansion valve 19 are opened, and the 3rd electric expansion valve 21 is closed, and the glide path of cold-producing medium is:
Compressor 1 exhaust outlet---outdoor cross valve 2---second check valve 5---high-pressure gas-liquid separator 15, this moment, high-temperature high-pressure refrigerant gas flowed out from second interface of high-pressure gas-liquid separator 15, the flow direction of cold-producing medium is after flowing out: first cross valve 12---first indoor set 16---first electric expansion valve 17---second electric expansion valve 19---second indoor set 18---second cross valve 13---the 3rd check valve 6---outdoor heat exchanger 3---outdoor cross valve 2---gas-liquid separator 9, sucked by compressor 1 air entry at last, after overcompression, participate in circulation next time.
The applicant has introduced structure of the present utility model by above embodiment, and utilizing embodiment 1 to introduce the control method of the present utility model and the course of work of multi-joint unit under various states especially as the control object, this can not be considered to a kind of restriction of the present utility model.Because the utility model also has some more conspicuous to one skilled in the art distortion, together with the cross valve of series connection with it and the increase of throttling arrangement, but the change of essence does not take place in the total of complete machine as indoor heat exchanger, water tank number; Also have the common replacement of described throttling arrangement and increase branch road in parallel; Indoor and outdoor heat exchangers in parallel or series connection etc.Therefore, under inspiration of the present utility model, the conspicuous distortion that those skilled in the art makes all should fall within the protection domain of the present utility model.
Claims (5)
1. can freeze simultaneously, heat and heat the combined air conditioners unit of water, comprise outdoor unit, coolant distributor and indoor units, described outdoor unit, coolant distributor and indoor units are formed the complete circulatory system by connecting line, described outdoor unit comprises at least one compressor, outdoor heat exchanger, outdoor cross valve, indoor units comprises at least two indoor sets, a water tank reaches and described indoor set, the electric expansion valve that water tank connects, each indoor set, be connected in parallel between the water tank, it is characterized in that: described outdoor unit also comprises four check valves, described coolant distributor comprises high-pressure gas-liquid separator, electric expansion valve A, electric expansion valve B, with indoor set, the corresponding cross valve of water tank, first interface of described high-pressure gas-liquid separator is connected with the cold-producing medium outflow end of second check valve, the cold-producing medium of second check valve flows into end and is connected with the normally closed port of outdoor cross valve, the air inlet of the cross valve in second interface of described high-pressure gas-liquid separator and the coolant distributor is connected, the 3rd interface of described high-pressure gas-liquid separator is connected with electric expansion valve A, the other end of electric expansion valve A is connected with indoor units, the end of described electric expansion valve B is connected with indoor units, the gas outlet of the cross valve in the other end and the coolant distributor is connected, normal ported with the corresponding indoor set of cross valve or water tank connect in the described coolant distributor, connect by capillary between normally closed port and the gas outlet, the cold-producing medium outflow end of described first check valve is connected with the normally closed port of outdoor cross valve, the gas outlet that cold-producing medium flows into the cross valve in end and the coolant distributor is connected, the gas outlet that the 3rd check valve cold-producing medium flows into the cross valve in end and the coolant distributor is connected, the cold-producing medium outflow end is connected with outdoor heat exchanger, the cold-producing medium outflow end of the 4th check valve is connected with first interface of high-pressure gas-liquid separator, cold-producing medium flows into end and is connected with outdoor heat exchanger, normal ported connection of outdoor heat exchanger opposite side and outdoor cross valve.
2. the combined air conditioners unit that can freeze, heat and heat water simultaneously according to claim 1 is characterized in that: also be connected to an oil eliminator between the exhaust outlet of described compressor and the air inlet of outdoor cross valve.
3. the combined air conditioners unit that can freeze, heat and heat water simultaneously according to claim 1 is characterized in that: the air entry of described compressor and and the outlet of outdoor cross valve between also be connected to a gas-liquid separator.
4. the combined air conditioners unit that can freeze, heat and heat water simultaneously according to claim 1 and 2, it is characterized in that: the pipeline between the air inlet of described oil eliminator and outdoor cross valve is provided with high pressure sensor.
5. according to claim 1 or the 3 described combined air conditioners units that can freeze, heat and heat water simultaneously, it is characterized in that: the pipeline between the gas outlet of described gas-liquid separator and outdoor cross valve is provided with low pressure sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200515126U CN201028884Y (en) | 2007-05-12 | 2007-05-12 | Multi-connected air conditioning unit capable of refrigerating, heating and heating water simultaneously |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200515126U CN201028884Y (en) | 2007-05-12 | 2007-05-12 | Multi-connected air conditioning unit capable of refrigerating, heating and heating water simultaneously |
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| CN201028884Y true CN201028884Y (en) | 2008-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2007200515126U Expired - Lifetime CN201028884Y (en) | 2007-05-12 | 2007-05-12 | Multi-connected air conditioning unit capable of refrigerating, heating and heating water simultaneously |
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| CN101655281B (en) * | 2008-08-22 | 2012-06-27 | 珠海格力电器股份有限公司 | Heat pump hot water air conditioning unit and working method thereof |
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- 2007-05-12 CN CNU2007200515126U patent/CN201028884Y/en not_active Expired - Lifetime
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