CN103759456B - A kind of air-conditioning or the heat-exchange system of heat pump and Defrost method thereof - Google Patents

A kind of air-conditioning or the heat-exchange system of heat pump and Defrost method thereof Download PDF

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Publication number
CN103759456B
CN103759456B CN201410041118.9A CN201410041118A CN103759456B CN 103759456 B CN103759456 B CN 103759456B CN 201410041118 A CN201410041118 A CN 201410041118A CN 103759456 B CN103759456 B CN 103759456B
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heat exchanger
outdoor heat
outdoor
indoor
exchange
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CN201410041118.9A
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CN103759456A (en
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平武臣
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平武臣
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Abstract

The invention discloses the heat-exchange system of a kind of air-conditioning or heat pump, including compressor, indoor heat exchanger, first throttle element, outdoor heat exchanger, described first throttle element arranges near outdoor heat exchanger, is provided with blower fan at described outdoor heat exchanger;Described outdoor heat exchanger includes the first outdoor heat exchanger and the second outdoor heat exchanger that can switch between evaporator mode and condenser modes, described first outdoor heat exchanger, one end of the second outdoor heat exchanger connect compressor or indoor heat exchanger by controllable electromagnetic valve respectively, first outdoor heat exchanger, the other end of the second outdoor heat exchanger are connected by control valve or connect indoor heat exchanger, when first outdoor heat exchanger and the second outdoor heat exchanger are connected, first throttle element is connected between the two.The invention also discloses a kind of Defrost method based on above-mentioned heat-exchange system.The heat-exchange system of the present invention keeps to indoor heating during defrosting, it is ensured that indoor comfortableness.

Description

A kind of air-conditioning or the heat-exchange system of heat pump and Defrost method thereof

Technical field

The present invention relates to heat-exchange system, be specifically related to a kind of air-conditioning or the heat-exchange system of heat pump and Defrost method thereof.

Background technology

Heat pump air conditioner is widely used in the family in the present age, the course of normal operation of heat pump air conditioner is, compressor discharges high-temperature high-pressure refrigerant (one of heat transferring medium) steam to indoor heat exchanger, utilize the condensation heat of refrigerant vapour to indoor heating, cold-producing medium from indoor heat exchanger out after, outdoor heat exchanger is reached, from outdoor heat exchanger heat absorption evaporation through expansion valve.But, in the winter time, heat pump air conditioner is when heating, easily there is frost in outdoor heat exchanger surface, affects heating performance of air conditioner, can cause the air-conditioner cannot be properly functioning time serious, therefore, when carrying out defrosting operation after outdoor heat exchanger frosting to a certain extent.

The most most common maximally effective Defrost method is hot gas cycle, during hot gas cycle defrosting, use cross valve commutation that by original evaporator operation pattern, outdoor heat exchanger is converted to condenser working pattern temporarily, indoor heat exchanger is evaporator operation pattern by original condenser working patten transformation simultaneously, the high-temperature high-pressure refrigerant steam condensation heat release utilizing compressor to discharge to outdoor heat exchanger defrosts, after defrosting terminates, again press heating mode and run.It is however a drawback of the method that suspend during Chu Shuan to indoor heating, the most also it is used for defrosting with indoor absorption heat, has a strong impact on the comfort level of indoor;Additionally, under clammy weather environment, the situation that easy appearance defrosts repeatedly, system is forced between defrosting and heating mode switchover operation repeatedly, is substantially reduced indoor comfort and declines, and have impact on the service life of system.

The application principle of heat pump water heater is identical with above-mentioned heat pump air conditioner with shortcoming.

The method that mode of operation carries out defrosting is carried out above by cross valve switching, defrosting start and at the end of, system wants inverted running, the liquid refrigerant gathered in former condenser pours into compressor in a large number owing to pressure is reduced to pressure of inspiration(Pi) suddenly, it is easily caused liquid hit phenomenon, thus affects the service life of compressor and system.

Additionally, existing heat pump air conditioner or heat pump water heater exist the situation being provided with multiple outdoor heat exchanger, but multiple outdoor heat exchanger therein is usually set up in parallel, and there is impact each other, reduces the effect heating and defrosting.

In addition to the Defrost method of above-mentioned hot gas cycle, also disclose now other Defrost technologies many, but, major part structure therein is complicated, relatively costly, and is difficult to.

Summary of the invention

In order to overcome the deficiencies in the prior art, it is an object of the invention to provide a kind of air-conditioning or the heat-exchange system of heat pump and Defrost method thereof, can be in the case of not affecting indoor heating, it is achieved the defrosting operation of outdoor heat exchanger.

The technical solution adopted for the present invention to solve the technical problems is:

A kind of air-conditioning or the heat-exchange system of heat pump, including compressor, indoor heat exchanger, first throttle element, outdoor heat exchanger;

Described first throttle element is arranged near outdoor heat exchanger;

It is provided with blower fan at described outdoor heat exchanger;

Described outdoor heat exchanger includes the first outdoor heat exchanger and the second outdoor heat exchanger that can switch between evaporator mode and condenser modes;

Described first outdoor heat exchanger, one end of the second outdoor heat exchanger connect compressor or indoor heat exchanger by controllable electromagnetic valve respectively, and the first outdoor heat exchanger, the other end of the second outdoor heat exchanger are connected by control valve or connect indoor heat exchanger;

When first outdoor heat exchanger and the second outdoor heat exchanger are connected, first throttle element is connected between the two.

As the further improvement of technique scheme, described indoor heat exchanger two ends are parallel with fault control valve.Preferably, fault control valve be located proximate to outdoor heat exchanger, it is substantially shorter the closed circuit of cold-producing medium, when wanting quickly defrosting, changeable fault control valve makes indoor heat exchanger two terminal shortcircuit, so that the heat as the outdoor heat exchanger offer of vaporizer is completely used for defrosting, accelerate the progress of defrosting.

Further improvement as technique scheme, the cross valve for changing the refrigerant flow direction that compressor is discharged it is provided with at described compressor, changed the flow direction of cold-producing medium, simultaneously switching indoor heat exchanger and the mode of operation of outdoor heat exchanger by cross valve, the function of indoor refrigeration can be realized.

Further, being additionally provided with second section fluid element between described indoor heat exchanger and outdoor heat exchanger, described second section fluid element is arranged near indoor heat exchanger.In heat-exchange system, restricting element is arranged near the heat exchanger of evaporator mode, and cold-producing medium is by being directly entered the heat exchanger of evaporator mode after restricting element, it is thus achieved that effect best.

As the further improvement of technique scheme, described restricting element is capillary tube or expansion valve.Further, before restricting element, it is preferably provided with device for drying and filtering, improves cold-producing medium further by the expansion effect after restricting element.

As the further improvement of technique scheme, described first outdoor heat exchanger and the second outdoor heat exchanger are made up of least one set heat exchanger tube.

As the further improvement of technique scheme, described first outdoor heat exchanger and the second outdoor heat exchanger are set up in parallel, or arrange on the same line according to its long side direction, or arrange in V-shape.

A kind of Defrost method based on above-mentioned heat-exchange system, it is characterized in that, when the first outdoor heat exchanger needs defrosting, first outdoor heat exchanger is condenser modes, second outdoor heat exchanger is evaporator mode, controllable electromagnetic Vavle switching makes the first outdoor heat exchanger be directly connected to indoor heat exchanger, and the first outdoor heat exchanger, first throttle element and the second outdoor heat exchanger are sequentially connected in series, the high-temperature high-pressure refrigerant discharged from compressor first passes through indoor heat exchanger, it is then passed through handed over the first outdoor heat exchanger heat release defrosting for condenser modes, after first throttle element, enter back into the second outdoor heat exchanger heat absorption evaporation being in evaporator mode, the refrigerant vapour being evaporated enters compressor and forms a circulation;

When the second outdoor heat exchanger needs defrosting, second outdoor heat exchanger is condenser modes, first outdoor heat exchanger is evaporator mode, controllable electromagnetic Vavle switching makes the second outdoor heat exchanger be directly connected to indoor heat exchanger, and the second outdoor heat exchanger, first throttle element and the first outdoor heat exchanger are sequentially connected in series, the high-temperature high-pressure refrigerant discharged from compressor first passes through indoor heat exchanger, it is then passed through handed over the second outdoor heat exchanger heat release defrosting for condenser modes, after first throttle element, enter back into the first outdoor heat exchanger heat absorption evaporation being in evaporator mode, the refrigerant vapour being evaporated enters compressor and forms a circulation.

The invention has the beneficial effects as follows:

Contrast prior art, the heat-exchange system of the present invention is provided with the first outdoor heat exchanger and the second outdoor heat exchanger, when heating mode of operation, first outdoor heat exchanger and the second outdoor heat exchanger are arranged in parallel, and be all vaporizer, indoor heat exchanger is condenser, and outdoor heat exchanger absorbs external heat and is supplied to indoor heat exchanger;When defrosting mode of operation, the first outdoor heat exchanger is condenser, and the second outdoor heat exchanger is vaporizer, the first outdoor heat exchanger heat release defrosting, and the second outdoor heat exchanger normally works, and keeps indoor heating, and provides heat for the first outdoor heat exchanger defrosting;After first outdoor heat exchanger completes defrosting, switching working mode, the first outdoor heat exchanger is vaporizer, and the second outdoor heat exchanger is condenser, and the second outdoor heat exchanger carries out defrosting operation;After two outdoor heat exchanger defrostings, system again switches to and heats mode of operation.The heat-exchange system of the present invention keeps to indoor heating during defrosting, it is ensured that indoor comfortableness.

Accompanying drawing explanation

The present invention is further described with embodiment below in conjunction with the accompanying drawings.

Fig. 1 is the structural representation of the first embodiment of the present invention;

Fig. 2 is the flow graph of first embodiment of the present invention cold-producing medium in a heating mode;

Fig. 3 to Fig. 5 is the flow graph of first embodiment of the present invention cold-producing medium in defrost mode;

Fig. 6 is the structural representation of the second embodiment of the present invention;

Fig. 7 is the heat-exchange system refrigerant flow direction figure in cooling mode of the second embodiment;

Fig. 8 is the structural representation of the third embodiment of the present invention;

Fig. 9 is the structural representation of the fourth embodiment of the present invention;

Figure 10 is the structural representation of the fifth embodiment of the present invention;

Figure 11 is the structural representation of the sixth embodiment of the present invention;

Figure 12 is the structural representation of the heat-exchange system of indoor defrosting.

Detailed description of the invention

Embodiment one:

With reference to Fig. 1, a kind of air-conditioning of present invention offer or the heat-exchange system of heat pump, including compressor 1, indoor heat exchanger the 2, first expansion valve 5 and outdoor heat exchanger, outdoor heat exchanger includes the first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 that can switch between evaporator mode and condenser modes, being provided with blower fan (being not drawn in accompanying drawing) at outdoor heat exchanger, the first expansion valve 5 is arranged near outdoor heat exchanger.Wherein, the upper end of first outdoor heat exchanger the 3, second outdoor heat exchanger 4 connects compressor 1 or indoor heat exchanger 2 by first reversal valve the 6, second reversal valve 7 respectively, the lower end of first outdoor heat exchanger the 3, second outdoor heat exchanger 4 is connected by control valve or connects indoor heat exchanger 2, control valve can be being applied in combination of one or more in the valves such as one way stop peturn valve, electromagnetic valve, reversal valve, when the first outdoor heat exchanger 3 is connected with the second outdoor heat exchanger 4, the first expansion valve 5 is connected between the two.

Fig. 2 show the heat-exchange system of first embodiment refrigerant flow direction figure in a heating mode, when heating mode of operation, first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 are all vaporizer, indoor heat exchanger 2 is condenser, the cold-producing medium of High Temperature High Pressure is after compressor 1 is discharged, heat release is condensed through indoor heat exchanger 2, then by the first expansion valve 5, the first outdoor heat exchanger 3 and the heat absorption evaporation of the second outdoor heat exchanger 4 is respectively enterd from the lower end of the first outdoor heat exchanger 3 and the second outdoor heat exchanger 4, at this moment the first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 are in parallel, improve the efficiency of heat absorption, refrigerant vapour after evaporation is discharged from the upper end of the first outdoor heat exchanger 3 and the second outdoor heat exchanger 4, compressor 1 is entered back into after confluxing, complete a circulation.

With reference to Fig. 3, Fig. 4, Fig. 3 show the first outdoor heat exchanger 3 and is in defrosting mode of operation, first outdoor heat exchanger 3 switches to condenser modes, second outdoor heat exchanger 4 is evaporator mode, first reversal valve 6 switching makes the first outdoor heat exchanger 3 be directly connected to indoor heat exchanger 2, and the first outdoor heat exchanger 3, first expansion valve 5 and the second outdoor heat exchanger 4 are sequentially connected in series, the cold-producing medium of High Temperature High Pressure is after compressor 1 is discharged, heat release is condensed through indoor heat exchanger 2, it is then passed through the first outdoor heat exchanger 3 heat release defrosting, after the first expansion valve 5, enter back into the second outdoor heat exchanger 4 heat absorption evaporation, the refrigerant vapour being evaporated enters compressor 1 and forms a circulation;Fig. 4 show the second outdoor heat exchanger 4 and is in defrosting mode of operation, after first outdoor heat exchanger 3 completes defrosting, switching working mode, first outdoor heat exchanger 3 is vaporizer, second outdoor heat exchanger 4 is condenser, second reversal valve 7 switching makes the second outdoor heat exchanger 4 be directly connected to indoor heat exchanger 2, and the second outdoor heat exchanger 4, first expansion valve 5 and the first outdoor heat exchanger 3 are sequentially connected in series, the cold-producing medium of High Temperature High Pressure is after compressor 1 is discharged, heat release is condensed through indoor heat exchanger 2, it is then passed through the second outdoor heat exchanger 4 heat release defrosting, after the first expansion valve 5, enter back into the first outdoor heat exchanger 3 heat absorption evaporation, the refrigerant vapour being evaporated enters compressor 1 and forms a circulation.

Further, fault control valve 8 can also be parallel with at the two ends of indoor heat exchanger 2.When wanting quickly defrosting, changeable fault control valve 8 makes 2 liang of terminal shortcircuits of indoor heat exchanger, so that the heat as the outdoor heat exchanger offer of vaporizer is completely used for defrosting, accelerates the progress of defrosting, as it is shown in figure 5, the flow graph of cold-producing medium when being then the first outdoor heat exchanger 3 quickly defrosting.

Further, before the first expansion valve 5, it is preferably provided with device for drying and filtering 15.

Embodiment two:

With reference to Fig. 6, the second embodiment that the present invention provides, it is with the difference of first embodiment, installing cross valve 9 at compressor 1 additional, and arrange the second expansion valve 10 between indoor heat exchanger 2 and outdoor heat exchanger, the second expansion valve 10 is arranged near indoor heat exchanger 2, it is preferably provided with device for drying and filtering 15 before second expansion valve 10, it addition, set up some relevant control valves, to change the flow direction of cold-producing medium.Cross valve 910, for changing the flow direction of the cold-producing medium that compressor 1 is discharged, can make cold-producing medium first flow through outdoor heat exchanger heat release after compressor 1 is discharged, then through the second expansion valve 10, arrive indoor heat exchanger 2 to absorb heat, finally it is back in compressor 1, completes kind of refrigeration cycle, as shown in Figure 7.

Embodiment three:

With reference to Fig. 8, Fig. 8 show a kind of heat-exchange system improved further on the basis of the second embodiment, its first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 form by organizing heat exchanger tube respectively, and arrange in V-shape, blower fan 11 is arranged on the opening part of V word just to the first outdoor heat exchanger 3 and the second outdoor heat exchanger 4, outdoor heat exchanger good effect of heat exchange in the present embodiment, is suitable for large-scale heating or refrigeration plant use, such as central air-conditioning.

Embodiment four:

With reference to Fig. 9, Fig. 9 show the another kind of heat-exchange system improved further on the basis of the second embodiment, its first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 arrange on the same line according to its long side direction, and both will not interact when defrosting, and defrosting effect is more preferable.When arranging a blower fan 11, one end that first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 are adjacent to each other is just arranged by blower fan 11, and middle wind-force is maximum, good effect of heat exchange, the wind-force of surrounding is minimum, easily frosting, under heating mode, can make cold-producing medium enter outdoor heat exchanger from centre position, improve the effect of heat exchange, during defrosting, cold-producing medium can be made to enter outdoor heat exchanger from periphery, the effect of defrosting is more preferable.

In addition, two Fans also can be set on the basis of the present embodiment, two Fans are respectively just to the first outdoor heat exchanger 3 and the second outdoor heat exchanger 4, and the separately regulation and control of two Fans, as when the first outdoor heat exchanger 3 defrosts, just the blower fan of the first outdoor heat exchanger 3 can be quit work, and another Fans keeps running.Separately regulation and control are not on the premise of affecting heat transfer effect, can reach the effect of energy-conserving and environment-protective.

Embodiment five:

With reference to Figure 10, Figure 10 show the another kind of heat-exchange system improved further on the basis of the second embodiment, wherein, first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 are set up in parallel, but in the same time, the cold-producing medium flow direction in the first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 is contrary, improves heat exchange and the effect of defrosting.

Embodiment six:

With reference to Figure 11, Figure 11 show the sixth embodiment of the present invention, in above-mentioned five embodiments, heating or under refrigeration mode, the first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 are to be arranged in parallel, and the sixth embodiment of the present invention, first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 are always maintained at being connected in series, such as Figure 11, connect between the first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 and have the 3rd expansion valve 12, the 3rd expansion valve 12 two ends to be provided with short valve I 13.Present embodiment discloses the structure that a kind of multiple outdoor heat exchanger is connected in series, achieving defrosting equally does not affect the effect of indoor heating.

The heat-exchange system of the present invention is provided with the first outdoor heat exchanger 3 and the second outdoor heat exchanger 4, when heating mode of operation, first outdoor heat exchanger 3 and the second outdoor heat exchanger 4 are all vaporizer, and indoor heat exchanger 2 is condenser, and outdoor heat exchanger absorbs external heat and is supplied to indoor heat exchanger 2;When defrosting mode of operation, the first outdoor heat exchanger 3 is condenser, and the second outdoor heat exchanger 4 is vaporizer, the first outdoor heat exchanger 3 heat release defrosting, and the second outdoor heat exchanger 4 normally works, and keeps indoor heating, and provides heat for the first outdoor heat exchanger 3 defrosting;After first outdoor heat exchanger 3 completes defrosting, switching working mode, the first outdoor heat exchanger 3 is vaporizer, and the second outdoor heat exchanger 4 is condenser, and the second outdoor heat exchanger 4 carries out defrosting operation;After two outdoor heat exchanger defrostings, system again switches to and heats mode of operation.The heat-exchange system of the present invention keeps to indoor heating during defrosting, it is ensured that indoor comfortableness.

Additionally, as shown in figure 12, in the environment of some is special, this heat-exchange system can be used in turn.When for indoor refrigeration, two indoor heat exchangers, two indoor heat exchanger composition defrosting loops can be set, when heat exchanger frosting due to long-time refrigeration, defrosting mode can be started, make indoor heat exchanger be automatically converted to condenser and defrost.

The foregoing is only the preferred embodiments of the present invention, as long as realizing within the technical scheme of the object of the invention broadly falls into protection scope of the present invention with essentially identical means.

Claims (6)

1. air-conditioning or a heat-exchange system for heat pump, including compressor, indoor heat exchanger, first throttle element, outdoor heat exchanger;
Described first throttle element is arranged near outdoor heat exchanger;
It is provided with blower fan at described outdoor heat exchanger;
It is characterized in that, described indoor heat exchanger two ends are parallel with fault control valve;
Described outdoor heat exchanger includes the first outdoor heat exchanger and the second outdoor heat exchanger that can switch between evaporator mode and condenser modes;
Described first outdoor heat exchanger, one end of the second outdoor heat exchanger connect compressor or indoor heat exchanger by controllable electromagnetic valve respectively, and the first outdoor heat exchanger, the other end of the second outdoor heat exchanger are connected by control valve or connect indoor heat exchanger;
When the first outdoor heat exchanger and the second outdoor heat exchanger are connected, first throttle element is connected between the two;
Described first outdoor heat exchanger and the second outdoor heat exchanger are made up of least one set heat exchanger tube;
Described first outdoor heat exchanger and the second outdoor heat exchanger arrange on the same line according to its long side direction, one end that first outdoor heat exchanger and the second outdoor heat exchanger are adjacent to each other is just arranged by blower fan, under heating mode, cold-producing medium is made to enter outdoor heat exchanger from centre position, during defrosting, cold-producing medium is made to enter outdoor heat exchanger from straight line two ends.
A kind of air-conditioning the most according to claim 1 or the heat-exchange system of heat pump, it is characterised in that: it is provided with the cross valve for changing the refrigerant flow direction that compressor is discharged at described compressor.
A kind of air-conditioning the most according to claim 2 or the heat-exchange system of heat pump, it is characterised in that: being additionally provided with second section fluid element between described indoor heat exchanger and outdoor heat exchanger, described second section fluid element is arranged near indoor heat exchanger.
4. according to a kind of air-conditioning described in claim 1 or 3 or the heat-exchange system of heat pump, it is characterised in that: described restricting element is capillary tube or expansion valve.
A kind of air-conditioning the most according to claim 4 or the heat-exchange system of heat pump, it is characterised in that: it is provided with device for drying and filtering before described restricting element.
6. a Defrost method based on the arbitrary described heat-exchange system of claims 1 to 3, it is characterized in that, when the first outdoor heat exchanger needs defrosting, first outdoor heat exchanger is condenser modes, second outdoor heat exchanger is evaporator mode, controllable electromagnetic Vavle switching makes the first outdoor heat exchanger be directly connected to indoor heat exchanger, and the first outdoor heat exchanger, first throttle element and the second outdoor heat exchanger are sequentially connected in series, the high-temperature high-pressure refrigerant discharged from compressor first passes through indoor heat exchanger, it is then passed through handed over the first outdoor heat exchanger heat release defrosting for condenser modes, after first throttle element, enter back into the second outdoor heat exchanger heat absorption evaporation being in evaporator mode, the refrigerant vapour being evaporated enters compressor and forms a circulation;
When the second outdoor heat exchanger needs defrosting, second outdoor heat exchanger is condenser modes, first outdoor heat exchanger is evaporator mode, controllable electromagnetic Vavle switching makes the second outdoor heat exchanger be directly connected to indoor heat exchanger, and the second outdoor heat exchanger, first throttle element and the first outdoor heat exchanger are sequentially connected in series, the high-temperature high-pressure refrigerant discharged from compressor first passes through indoor heat exchanger, it is then passed through handed over the second outdoor heat exchanger heat release defrosting for condenser modes, after first throttle element, enter back into the first outdoor heat exchanger heat absorption evaporation being in evaporator mode, the refrigerant vapour being evaporated enters compressor and forms a circulation.
CN201410041118.9A 2014-01-27 2014-01-27 A kind of air-conditioning or the heat-exchange system of heat pump and Defrost method thereof CN103759456B (en)

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CN103954082B (en) * 2014-05-12 2017-01-25 珠海格力电器股份有限公司 Air-conditioning system
CN104848578B (en) * 2015-04-29 2017-12-12 广东美的制冷设备有限公司 The control method of air conditioner and air conditioner
CN105627432A (en) * 2015-12-25 2016-06-01 珠海格力电器股份有限公司 Air conditioning system and defrosting control method thereof
CN107917561A (en) * 2016-10-11 2018-04-17 青岛海尔新能源电器有限公司 The defroster and Teat pump boiler of a kind of Teat pump boiler
CN106907877B (en) * 2017-03-10 2019-05-07 南京理工大学 A kind of double evaporators alternately defrosting net for air-source heat pump units and its Defrost method
CN107906777A (en) * 2017-10-24 2018-04-13 青岛海尔空调电子有限公司 Heat pump unit

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CN200955881Y (en) * 2006-01-05 2007-10-03 南京天加空调设备有限公司 Continuous defrosting and heating air source heat pump
CN101469926B (en) * 2007-12-29 2012-09-05 苏州三星电子有限公司 Improved air conditioner defrosting system and its control method
CN101368777A (en) * 2008-10-14 2009-02-18 天津商业大学 Liquid coolant defrosting and refrigeration system
CN202141264U (en) * 2011-06-07 2012-02-08 杭州凯利不锈钢厨房设备有限公司 Energy storage and conversion device
CN203785310U (en) * 2014-01-27 2014-08-20 平武臣 Heat exchanging system of air conditioner or heat pump

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Effective date of registration: 20201106

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Address before: 529000 Guangdong province Jiangmen Jianghai district two building in Hungnam Longview two 401

Patentee before: Ping Wuchen