CN102287978B - An air source heat pump composite heat source defrosting system - Google Patents

Abstract

The invention provides a composite heat-source defrosting system for an air-source heat pump, which is characterized in that: the defrosting system comprises an outdoor heat exchanger, i.e. a defrosting-type composite heat-source heat exchanger of an air-source heat-pump system, an auxiliary defrosting heat-source supplying device, an auxiliary heat-source circulating pump, a pipeline, a valve and the like, wherein the defrosting-type composite heat-source heat exchanger is divided into a combined form and an integrated form. A low-temperature air heat-source side is synchronously defrosted with high efficiency while the uninterrupted heat supply of the air-source heat pump is realized under the condition of a winter low-temperature outdoor environment by a defrosting method by utilizing the two concrete structural forms of the defrosting-type composite heat-source heat exchanger and the temperature difference between an auxiliary high-temperature defrosting heat source and an outdoor low-temperature air heat source.

Description

An air source heat pump composite heat source defrosting system

technical field

The invention relates to an air conditioner defrosting technology, in particular to an air source heat pump composite heat source defrosting system.

Background technique

At present, the air-source heat pump air-conditioning system often has frosting phenomenon during low-temperature heating in winter, which seriously affects the heating effect. However, the existing defrosting technologies have low defrosting efficiency, high energy consumption, or cannot realize the synchronization of heating and defrosting This makes it difficult for the air source heat pump air conditioning system to operate reliably during low temperature heating in winter.

Contents of the invention

The object of the present invention is to provide an air source heat pump compound heat source defrosting system for the deficiencies in the prior art shown. With a certain temperature difference, the air source heat pump can realize the synchronous and efficient defrosting of the low temperature air heat source side while providing uninterrupted heat under the low temperature outdoor environment in winter.

The purpose of the present invention can be achieved through the following technical measures:

The air source heat pump composite heat source defrosting system of the present invention includes an outdoor defrosting type composite heat source heat exchanger of the air source heat pump system, a defrosting auxiliary heat source supply device, an auxiliary heat source circulation pump, and corresponding pipelines and valves; the defrosting type The inlet of the defrosting auxiliary heat source medium channel of the composite heat source heat exchanger is connected to the outlet of the defrosting auxiliary heat source supply device, and the outlet of the defrosting auxiliary heat source medium channel is connected to the inlet of the defrosting auxiliary heat source supply device through the control valve and the auxiliary heat source circulation pump. Connection; the heat pump working fluid inlet of the defrosting type composite heat source heat exchanger is connected to the indoor heat exchanger outlet through a throttling device, and the heat pump working fluid outlet of the defrosting type composite heat source heat exchanger is connected to the compressor inlet through a function control valve , the outlet of the compressor is connected to the inlet of the indoor heat exchanger through a function control valve; the defrosting type compound heat source heat exchanger is a combined type or an integrated type, and has three types: heat pump working medium, defrosting auxiliary heat source and low-temperature air heat source media channel.

The combined defrosting type composite heat source heat exchanger of the present invention is composed of a low-temperature air-defrosting auxiliary heat source two-medium heat exchanger and a low-temperature air-heat pump working fluid two-medium heat exchanger; low-temperature air-defrosting auxiliary heat source The two-medium heat exchanger is placed on the air inlet side of the low-temperature air-heat pump working medium two-medium heat exchanger; the low-temperature air-defrosting auxiliary heat source two-medium heat exchanger and the low-temperature air-heat pump working medium two-medium heat exchanger are both It can be any structural form of tube-fin, stacked or parallel flow heat exchangers.

The tube-fin two-medium heat exchanger is composed of copper or aluminum round tubes covered with aluminum fins. The inside of the round tube forms an auxiliary heat source for defrosting or a heat pump medium channel. The outer surface of the round tube and the fins form a low temperature Air heat source medium channel.

The stacked two-medium heat exchanger is formed by stacking multiple units, and each unit is stacked with two flat or corrugated aluminum plates of the same size and shape to form an auxiliary heat source for defrosting or a heat pump medium channel. Serpentine heat dissipation aluminum strips form low-temperature air heat source medium channels between every two defrosting auxiliary heat sources or heat pump working medium channels.

The parallel-flow two-medium heat exchanger is composed of two cylindrical headers, a plurality of parallel aluminum inner rib flat tubes installed between the two cylindrical headers, and a wave shape installed between the aluminum inner rib flat tubes. Composed of heat dissipation fins and connecting pipes; the aluminum inner rib flat tube is equipped with multiple fins on the inner wall of the flat tube to form a plurality of microchannels; the inside of the cylindrical collector tube and the inner microchannel of the aluminum inner rib flat tube The auxiliary heat source for defrosting or the medium channel of the heat pump, the outer surface of the aluminum ribbed flat tube and the corrugated fins constitute the low-temperature air heat source medium channel.

The integrated defrosting composite heat source heat exchanger is any structural form of fin-round tube-in-tube heat exchanger, laminated sheet-tube-in-tube heat exchanger or parallel-flow flat tube-in-tube heat exchanger.

The fin-round tube casing type defrosting type composite heat source heat exchanger of the present invention (see ZL200720091299.1 for its specific structure) is set together by two round tubes with different diameters, that is, the small diameter inner tube wears Installed in the lumen of the large-diameter outer tube, the outer wall of the large-diameter outer tube is covered with fins, and the lumen of the small-diameter inner tube forms the defrosting auxiliary heat source medium channel, and the outer surface of the large-diameter outer tube The low-temperature air heat source medium channel is formed with the fins, and the annular space between the inner tube and the outer tube forms a heat pump working fluid channel.

The laminated tube-in-tube defrosting composite heat source heat exchanger is formed by stacking a plurality of tube-in-tube units with serpentine heat-dissipating aluminum strips, and each unit is welded by two flat or corrugated aluminum plates The large and small pieces of tubes with the same shape are set together. The small piece of tube forms the auxiliary heat source medium channel for defrosting, the heat pump working medium channel is formed between the large and small piece tubes, and the outer surface of the large piece of tube and the serpentine heat dissipation aluminum belt form the low temperature air heat source medium channel.

The parallel-flow flat-tube casing-type defrosting composite heat source heat exchanger consists of two cylindrical collecting sleeves, multiple sets of parallel-flow flat-tube casings installed in parallel between the two cylindrical collecting casings, It is composed of corrugated heat dissipation fins and connecting pipes between parallel flow flat pipe casings; the cylindrical collector casing is set together by two round pipes with different diameters, that is, the inner pipe with small diameter is worn on the large pipe. In the lumen of the outer tube, the lumen of the inner tube with a small diameter forms the auxiliary heat source medium channel for defrosting, and the annular space between the inner tube and the outer tube forms the heat pump working medium channel; the parallel-flow flat tube casing is composed of two Two aluminum flat tubes with the same shape and different cross-sectional areas are set together, and the inner flat tube with a small cross-sectional area is worn in the lumen of the outer flat tube with a large cross-sectional area; wherein the inner flat tube is equipped with A plurality of fins form a plurality of microchannels and form channels for defrosting auxiliary heat source medium; the annular space between the inner and outer flat tubes is provided with a plurality of fins to form a plurality of microchannels and form heat pump working fluid channels; The outer surface of the tube and the corrugated heat dissipation fins form a low-temperature air heat source medium channel.

The defrosting auxiliary heat source supply device of the present invention is any one of an underground water device, a solar water heating device, an automobile engine or a cooling liquid device for a power motor.

The beneficial effects of the present invention are as follows:

The invention utilizes the set temperature difference between the high-temperature defrosting auxiliary heat source and the outdoor low-temperature air heat source to realize synchronous and efficient defrosting of the low-temperature air heat source side while the air-source heat pump is providing uninterrupted heat under low-temperature outdoor environmental conditions in winter. The implementation of the present invention can effectively solve the outstanding problems of high energy consumption during heating and defrosting of the current air-conditioning system and inability to simultaneously supply heat and defrost.

Description of drawings

Figure 1 is a schematic diagram of the present invention.

Figure 2 is a structural diagram of a combined tube-fin type two-medium heat exchanger.

Fig. 3 is a structural diagram of a combined stacked two-medium heat exchanger.

FIG. 4 is a cross-sectional view of FIG. 3 .

Fig. 5 is a structural diagram of a combined parallel-flow two-medium heat exchanger.

FIG. 6 is a cross-sectional view of FIG. 5 .

FIG. 7 is a top view of FIG. 5 .

Fig. 8 is a structural diagram of a composite fin-round tube casing type defrosting type composite heat source heat exchanger.

Fig. 9 is a structural diagram of a composite laminated sheet-tube-in-tube defrosting type composite heat source heat exchanger.

FIG. 10 is a cross-sectional view of FIG. 9 .

Fig. 11 is a structural diagram of a composite parallel-flow flat tube-in-tube defrosting type composite heat source heat exchanger.

FIG. 12 is a cross-sectional view of FIG. 11 .

FIG. 13 is a top view of FIG. 11 .

In the figure: 1 is the defrosting type composite heat source heat exchanger, 2 is the defrosting auxiliary heat source supply device, 3 is the auxiliary heat source circulation pump, 4 is the auxiliary heat source control valve, 5 is the function control valve, 6 is the compressor, 7 is Indoor heat exchanger, 8 is a throttling device, 10 is a fin, 11 is a serpentine heat dissipation aluminum strip, 12 is a cylindrical collector, 13 is a spacer, 14 is an inner tube, 15 is an annular space, and 16 is an outer tube. Tube, 17 is a small-diameter cylindrical collector, and 18 is a large-diameter cylindrical collector

Detailed ways

The present invention will be further described below in conjunction with examples (accompanying drawings), but does not limit the present invention.

As shown in Figure 1, the air source heat pump composite heat source defrosting system of the present invention includes an outdoor heat exchanger composed of a defrosting type composite heat source heat exchanger 1, and the defrosting auxiliary of the defrosting type composite heat source heat exchanger 1 The inlet of the heat source medium channel is connected to the outlet of the defrosting auxiliary heat source supply device 2, and the outlet of the defrosting auxiliary heat source medium channel is connected to the inlet of the defrosting auxiliary heat source supply device 2 through the control valve 4 and the auxiliary heat source circulating pump 3; The heat pump working medium inlet of the frost-type composite heat source heat exchanger 1 is connected to the outlet of the indoor heat exchanger 7 through the throttling device 8, and the heat pump working medium outlet of the defrost-type composite heat source heat exchanger 1 is connected to the compressor 6 through the function control valve 5 The inlet and the outlet of the compressor 6 are connected to the inlet of the indoor heat exchanger 7 through the function control valve; Air heat source Three media channels.

The combined defrosting type composite heat source heat exchanger 1 of the present invention is composed of a low-temperature air-defrosting auxiliary heat source two-medium heat exchanger and a low-temperature air-heat pump working fluid two-medium heat exchanger; The heat source two-medium heat exchanger is placed on the side of the air inlet of the low-temperature air-heat pump working fluid two-medium heat exchanger.

The low-temperature air-defrosting auxiliary heat source two-medium heat exchanger and the low-temperature air-heat pump working fluid two-medium heat exchanger are any one of tube-fin, stacked or parallel flow heat exchangers.

As shown in Figure 2, the tube-fin two-medium heat exchanger is composed of copper or aluminum circular tubes covered with aluminum fins 10, and the inside of the circular tube forms an auxiliary heat source for defrosting or a channel for the heat pump working medium. The outer surface and the fins form a low-temperature air heat source medium channel.

As shown in Figures 3 and 4, the laminated two-medium heat exchanger is formed by stacking multiple units, and each unit is composed of two aluminum plates of the same size and shape (in any form of plane or corrugated surface) Stacked together to form defrosting auxiliary heat sources or heat pump working medium channels, between every two defrosting auxiliary heat sources or heat pump working medium channels is formed by a serpentine heat dissipation aluminum belt 11 to form a low-temperature air heat source medium channel.

As shown in Figures 5, 6, and 7, the parallel-flow two-medium heat exchanger is composed of two cylindrical headers 12 and a plurality of parallel aluminum ribbed flat tubes installed between the two cylindrical headers. 1. The corrugated cooling fins installed between the aluminum inner rib flat tubes and connecting pipes; The inner microchannel of the aluminum inner rib flat tube constitutes the auxiliary heat source for defrosting or the medium channel of the heat pump, and the outer surface of the aluminum inner rib flat tube and the corrugated heat dissipation fins form the low temperature air heat source medium channel.

As shown in Figure 8, the integrated defrosting type composite heat source heat exchanger 1 is a fin-round tube casing type, laminated sheet tube casing type or parallel flow flat tube casing type defrosting type composite heat source heat exchange The fin-round tube casing type defrosting type composite heat source heat exchanger is set together by two round tubes with different diameters, that is, the inner tube with a small diameter is installed in the lumen of the outer tube with a large diameter Among them, the outer wall of the large-diameter outer tube is covered with fins, and the lumen of the small-diameter inner tube forms the auxiliary heat source medium channel for defrosting, and the outer surface of the large-diameter outer tube and the fins form the low-temperature air heat source medium channel. The annular space between the inner tube and the outer tube constitutes a heat pump working medium channel.

As shown in Figures 9 and 10, the laminated tube-in-tube defrosting type compound heat source heat exchanger is formed by stacking a plurality of tube-in-tube units with serpentine heat-dissipating aluminum strips, and each unit consists of two A flat or corrugated aluminum plate is welded together with the same shape and size of the tubes. The small tubes form a defrosting auxiliary heat source medium channel, and the heat pump working fluid channel is formed between the large and small tubes. The belt constitutes a low-temperature air heat source medium channel.

As shown in Figures 11, 12, and 13, the parallel-flow flat tube casing type defrosting type composite heat source heat exchanger consists of two cylindrical collector sleeves and multiple sets of heat exchangers installed between the two cylindrical collector sleeves. It is composed of parallel flow flat tube sleeves arranged in parallel, corrugated heat dissipation fins and connecting pipes between parallel flow flat tube sleeves; the cylindrical collector sleeve is set together by two circular tubes with different diameters, namely The small-diameter inner tube is installed in the lumen of the large-diameter outer tube, and the lumen of the small-diameter inner tube forms the auxiliary heat source medium channel for defrosting, and the annular space between the inner tube and the outer tube forms the heat pump working fluid channel; The parallel flow flat tube casing is made of two aluminum flat tubes with the same shape and different cross-sectional areas, and the inner flat tube with a small cross-sectional area is inserted into the lumen of the outer flat tube with a large cross-sectional area wherein the inner flat tube is equipped with a plurality of ribs, forming a plurality of microchannels, and forming a defrosting auxiliary heat source medium channel; the annular space between the inner and outer flat tubes is provided with a plurality of ribs, forming a plurality of microchannels , and form a heat pump working medium channel; the outer surface of the outer flat tube and the corrugated heat dissipation fins form a low-temperature air heat source medium channel.

The defrosting auxiliary heat source supply device 2 of the present invention is any one of an underground water device, a solar water heating device, an automobile engine or a cooling liquid device for a power motor.

The working principle of the present invention is as follows:

When the air conditioning system is in the defrosting mode, the defrosting auxiliary heat source supply device 2 and the auxiliary heat source circulation pump 3 are started. The refrigerant is compressed into high-temperature and high-pressure refrigerant vapor by the compressor, and the vapor enters the indoor heat exchanger through the function control valve to dissipate heat and then becomes a high-temperature and high-pressure liquid refrigerant, thereby increasing the air temperature. After the high-temperature and high-pressure liquid refrigerant passes through the throttling device, its state changes rapidly and becomes a low-temperature and low-pressure liquid refrigerant. The low-temperature and low-pressure liquid refrigerant evaporates in the defrosting composite heat source heat exchanger 1, and the low-temperature and low-pressure liquid refrigerant becomes a low-temperature and low-pressure gaseous refrigerant. The low-temperature and low-pressure gaseous refrigerant returns to the compressor after passing through the functional control valve. The specific method is: for the combined defrosting type composite heat source heat exchanger, since the low-temperature air-defrosting auxiliary heat source two-medium heat exchanger is placed on the air inlet side of the low-temperature air-heat pump working medium two-medium heat exchanger, the low-temperature air - The defrosting auxiliary heat source two-medium heat exchanger directly heats the air, and when the hot air flows to the low-temperature air-heat pump working medium two-medium heat exchanger, it can defrost; for the compound defrosting type compound heat source heat exchanger, when When the high-temperature defrosting auxiliary heat source flows through the defrosting type composite heat source heat exchanger 1, the temperature of the higher-temperature high-temperature defrosting auxiliary heat source heat pump working medium is higher than that of the low-temperature air, so that the heat pump working medium heats the low-temperature air to thereby To achieve the purpose of defrosting.

Claims (6)

1. An air source heat pump composite heat source defrosting system, characterized in that: the defrosting system includes an outdoor defrosting type composite heat source heat exchanger (1) of the air source heat pump system, a defrosting auxiliary heat source supply device (2), Auxiliary heat source circulation pump (3) and corresponding pipes and valves; the inlet of the defrosting auxiliary heat source medium channel of the defrosting type composite heat source heat exchanger (1) is connected with the outlet of the defrosting auxiliary heat source supply device (2), The outlet of the defrosting auxiliary heat source medium channel is connected to the inlet of the defrosting auxiliary heat source supply device (2) through the control valve and the auxiliary heat source circulation pump (3); the heat pump working fluid of the defrosting type composite heat source heat exchanger (1) The inlet is connected to the outlet of the indoor heat exchanger through a throttling device, the outlet of the heat pump working fluid of the defrosting type composite heat source heat exchanger (1) is connected to the inlet of the compressor through a function control valve, and the outlet of the compressor is connected to the indoor heat exchanger through a function control valve Inlet; the defrosting type composite heat source heat exchanger (1) is a combined type or an integrated type, with three medium channels of heat pump working fluid, defrosting auxiliary heat source and low-temperature air heat source; the defrosting type composite heat source The heat exchanger (1) is any structural form of fin-round tube-in-tube heat exchanger, laminated tube-in-tube heat exchanger or parallel flow flat tube-in-tube heat exchanger; the fin-round tube in-tube heat exchanger The type defrosting type composite heat source heat exchanger consists of two round tubes with different diameters, that is, the inner tube with a small diameter is installed in the lumen of the outer tube with a large diameter, and the outer wall of the outer tube with a large diameter is covered with Fins, and the cavity of the small-diameter inner tube forms the defrosting auxiliary heat source medium channel, the outer surface of the large-diameter outer tube and the fins form the low-temperature air heat source medium channel, and the annular space between the inner tube and the outer tube Heat pump working fluid channel; the laminated tube-in-tube defrosting type composite heat source heat exchanger is formed by stacking a plurality of tube-in-tube units with serpentine heat-dissipating aluminum strips, and each unit consists of two planes or The corrugated aluminum plates are welded together with tubes of the same size and size. The small tubes form an auxiliary heat source medium channel for defrosting, and the heat pump working fluid channels are formed between the large and small tubes. The air heat source medium channel; the parallel flow flat tube casing type defrosting type composite heat source heat exchanger is composed of two cylindrical collector sleeves and multiple sets of parallel flow parallel flow tubes installed between the two cylindrical collector sleeves. The flat tube casing, the corrugated heat dissipation fin between the parallel flow flat tube casing and the connecting pipe; the cylindrical collector casing is set together by two round tubes with different diameters, that is, the inner tube It is installed in the lumen of the large-diameter outer tube, and the lumen of the small-diameter inner tube forms the auxiliary heat source medium channel for defrosting, and the annular space between the inner tube and the outer tube forms the heat pump working medium channel; the parallel flow flat The tube sleeve is made of two aluminum flat tubes with the same shape and different cross-sectional areas. The inner flat tube with a small cross-sectional area is installed in the lumen of the outer flat tube with a large cross-sectional area; There are multiple fins inside the flat tubes, forming multiple micro-channels, and forming auxiliary heat source medium channels for defrosting; the annular space between the inner and outer flat tubes is equipped with multiple fins, forming multiple micro-channels, and forming heat pump working Quality channel; the outer surface of the outer flat tube and the corrugated heat dissipation fins form a low-temperature air heat source medium channel. 2. The air source heat pump compound heat source defrosting system according to claim 1, characterized in that: the defrosting type compound heat source heat exchanger (1) consists of a low-temperature air-defrosting auxiliary heat source two-medium heat exchanger and a low-temperature The air-heat pump working medium two-medium heat exchanger is combined; the low-temperature air-defrosting auxiliary heat source two-medium heat exchanger is placed on the side of the air inlet of the low-temperature air-heat pump working medium two-medium heat exchanger; the low-temperature air-melting The frost auxiliary heat source two-medium heat exchanger and the low-temperature air-heat pump working fluid two-medium heat exchanger can be any structural form of tube-fin, stacked or parallel flow heat exchangers. 3. The air source heat pump compound heat source defrosting system according to claim 2, characterized in that: the tube-fin two-medium heat exchanger is composed of copper or aluminum round tubes covered with aluminum fins, and the round tubes The interior forms a defrosting auxiliary heat source or heat pump medium channel, and the outer surface of the circular tube and the fins form a low-temperature air heat source medium channel. 4. The air source heat pump compound heat source defrosting system according to claim 2, characterized in that: the stacked two-medium heat exchanger is formed by stacking a plurality of units, and each unit consists of two pieces of the same size and shape The flat or corrugated aluminum plates are stacked together to form the defrosting auxiliary heat source or heat pump working medium channel, and the serpentine heat dissipation aluminum belt forms the low-temperature air heat source medium channel between every two defrosting auxiliary heat source or heat pump working medium channels. 5. The air source heat pump compound heat source defrosting system according to claim 2, characterized in that: the parallel flow two-medium heat exchanger is composed of two cylindrical headers, two cylindrical headers It consists of a plurality of parallel aluminum inner rib flat tubes installed, corrugated heat dissipation fins installed between the aluminum inner rib flat tubes and connecting pipes; the aluminum inner rib flat tube is equipped with multiple ribs on the inner wall of the flat tube, forming Multiple micro-channels; the inside of the cylindrical header and the micro-channels inside the aluminum inner-finned flat tube constitute the auxiliary heat source for defrosting or the medium channel of the heat pump, and the outer surface of the aluminum inner-ribbed flat tube and the corrugated heat dissipation fins constitute a low-temperature air heat source media channel. 6. The air source heat pump compound heat source defrosting system according to claim 1, characterized in that: the defrosting auxiliary heat source supply device (2) is an underground water device, a solar water heating device, an automobile engine or a power motor coolant device any of the.

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