CN212378342U - Infrared defrosting heat exchanger and heat pump air conditioner adopting same - Google Patents
Infrared defrosting heat exchanger and heat pump air conditioner adopting same Download PDFInfo
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- CN212378342U CN212378342U CN202021346645.8U CN202021346645U CN212378342U CN 212378342 U CN212378342 U CN 212378342U CN 202021346645 U CN202021346645 U CN 202021346645U CN 212378342 U CN212378342 U CN 212378342U
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Abstract
The utility model provides an infrared defrosting heat exchanger and adopt heat pump air conditioner of this heat exchanger related to refrigeration technology field, this heat exchanger include the copper pipe, be used for right infrared radiation board, the return line of copper pipe heating and be used for driving working medium circulation pump that working medium circulated flow between copper pipe and return line. During defrosting, the infrared defrosting heat exchanger is provided with an independent working medium circulation path, and the functions of other structures in a system to which the infrared defrosting heat exchanger is applied are not influenced. The infrared radiation plate generates far infrared heat effect, which directly acts on the copper pipe, and the copper pipe is transferred to the working medium in a heat conduction mode. The working medium driven by the working medium circulating pump circulates between the copper pipe and the reflux path and heats the copper pipe integrally to form a complete defrosting process from inside to outside. The process avoids the problem that the refrigeration compressor is damaged due to the liquid-phase refrigerant suction and the liquid impact phenomenon, and simultaneously avoids the indoor temperature drop phenomenon caused by the prior heat pump air conditioner adopting reverse cycle defrosting during defrosting.
Description
Technical Field
The utility model belongs to the technical field of the refrigeration technique and specifically relates to indicate an infrared defrosting heat exchanger and adopt heat pump air conditioner of this heat exchanger.
Background
The heat pump air conditioner belongs to an air source heat pump, and is widely applied to the field of heating ventilation air conditioners due to the advantages of energy conservation, environmental protection, high energy utilization rate, dual functions of refrigeration and heating and the like. However, the air source heat pump is prone to frost formation of the outdoor heat exchanger (defining an evaporator under heating conditions), wherein the frost formation process of the outdoor heat exchanger of the air source heat pump is extremely complex, and involves numerous influence factors such as air inlet temperature, humidity, air flow, types and intervals of fins of the heat exchanger, surface characteristics of the fins, a frost layer structure and the like. The frosting of the outdoor heat exchanger can cause the problems of heat transfer resistance increase, air flow reduction, heat exchange capacity reduction and the like of the heat exchanger, so that the outdoor heat exchanger needs to be switched into a defrosting mode when the surface of the outdoor heat exchanger is frosted to a certain degree. At present, the defrosting modes commonly used by the air source heat pump include an electric heating method, a reverse circulation method and the like, however, in practical engineering application, defrosting is not thorough when the defrosting modes are adopted, when a unit restarts a heating mode, the outdoor heat exchanger can enable the frosting condition of the air source heat pump to be more serious, and even frost ice extrusion can be formed on the outdoor heat exchanger to cause the outdoor heat exchanger to be damaged. In addition, with the increase of frost layers among fins of the outdoor heat exchanger, the evaporation temperature of the outdoor heat exchanger is reduced, so that the phase change of the refrigerant from a liquid phase to a gas phase cannot be finished, and the refrigeration compressor sucks the liquid-phase refrigerant, so that the input current is increased, and even the refrigeration compressor is damaged by the liquid impact phenomenon. Therefore, defrosting of the outdoor heat exchanger becomes a key technology for normal operation of the air source heat pump.
The reverse circulation defrosting method has the characteristics of simplicity and easiness in operation, but is easy to generate liquid impact phenomenon. When the existing air source heat pump unit operates in a reverse cycle defrosting mode, an outdoor heat exchanger (defined as a condenser) of the existing air source heat pump unit is recovered to a refrigeration air-conditioning mode for circulation, and an indoor heat exchanger (defined as an evaporator) of the existing air source heat pump unit is recovered to a refrigeration air-conditioning mode for circulation. During the defrosting, in order to avoid the situation that the indoor air is directly blown with cold air, the indoor fan is usually closed, the convection heat exchange coefficient of the air side of the indoor heat exchanger is reduced, and the heat acquired by the indoor heat exchanger from the indoor space is little. When the temperature of the indoor heat exchanger is reduced to a low degree, and the refrigerant can not absorb heat from the indoor heat exchanger any more, the evaporation temperature and the evaporation pressure are obviously reduced, and the liquid impact phenomenon is generated when the refrigeration compressor sucks the liquid-phase refrigerant, so that the refrigeration compressor is damaged. It can be seen that the energy of the reverse circulation defrosting process of the existing air source heat pump unit mainly comes from the heat stored in the indoor heat exchanger and the work input by the refrigeration compressor, and in this case, the supply of defrosting heat is insufficient, the defrosting time is prolonged, and a series of operation problems are caused. On the other hand, in the defrosting process, no heat is supplied to the indoor space, so that the indoor temperature is reduced, and the indoor heating comfort effect is influenced.
Except that the reverse circulation defrosting, the defrosting mode that current air source heat pump set is commonly used still has hot-blast defrosting, electric defrosting and hot water defrosting etc. and the three all has the reliable advantage of defrosting, nevertheless: 1) the hot air defrosting needs to be provided with an air heater, so that the system is more complicated and the cost is remarkably increased; 2) the electric heating defrosting needs to add an electric heating device on a heat exchange fin structure of the outdoor heat exchanger, so that the air flow passing performance of the outdoor heat exchanger is influenced, and the normal operation of the refrigeration air conditioner is further influenced; 3) the hot water defrosting needs a hot water source, and the problem of inconvenient operation exists.
In summary, the existing methods for defrosting the outdoor heat exchanger of the air source heat pump have defects.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the existing reverse circulation defrosting method has incomplete defrosting and is easy to generate liquid impact phenomenon to cause damage to a refrigeration compressor; during defrosting, the indoor temperature is lowered due to no heat supply to the indoor heat exchanger.
In order to solve the technical problem, the utility model discloses a technical scheme be:
an infrared defrosting heat exchanger comprises a copper pipe, an infrared radiation plate used for heating the copper pipe, a return pipeline and a working medium circulating pump used for driving working media to circularly flow between the copper pipe and the return pipeline.
Further, the device also comprises a first three-way connecting pipe, a second three-way connecting pipe, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve and a fourth electromagnetic valve; one interface of the first three-way connecting pipe is connected with one end of the copper pipe, one interface of the first three-way connecting pipe is connected with the first electromagnetic valve, and the other interface of the first three-way connecting pipe is connected with the second electromagnetic valve; one interface of the second three-way connecting pipe is connected with the other end of the copper pipe, one interface of the second three-way connecting pipe is connected with the third electromagnetic valve, and the other interface of the second three-way connecting pipe is connected with the fourth electromagnetic valve; the second electromagnetic valve is positioned between the first three-way connecting pipe and the return pipeline, and the third electromagnetic valve is positioned between the second three-way connecting pipe and the return pipeline; the working medium circulating pump is positioned on the return pipeline.
Further, the surface of the copper pipe is provided with an infrared absorption layer.
Further, the copper pipe is composed of at least three straight pipe parts and at least two U-shaped bent parts, and the straight pipe parts and the U-shaped bent parts are alternately connected; all the straight pipe parts are parallel to each other, and the centers of the straight pipe parts are positioned on the same vertical surface; the two infrared radiation plates are perpendicular to the straight pipe part and are positioned beside the U-shaped bent part; the copper pipe is positioned between the two infrared radiation plates; the infrared absorption layer is located at the U-shaped bending part.
Further, the infrared radiation plate is positioned between the heat insulation layer and the copper pipe; the heat insulating layer is perpendicular to the straight pipe portion.
The straight tube part sequentially penetrates through each fin in the fin group; the fins are parallel to the infrared radiation plates, and the blowing direction of the first fan is perpendicular to the straight tube portions.
Furthermore, the infrared radiation plate is composed of a first insulating layer, an infrared radiation generation layer and a second insulating layer which are sequentially stacked, and the first insulating layer is hermetically connected with the edge of the second insulating layer.
Further, the infrared radiation generation layer is made of one or more materials of conductive carbon black, micro-nano graphite powder, carbon nano fibers, carbon nano tubes and graphene; the first insulating layer and the second insulating layer are both made of one or more materials of polyethylene terephthalate, ethylene-vinyl acetate copolymer, polydiallyl diglycol carbonate, a silicone rubber layer and polyimide resin; the infrared absorption layer is made of graphene and/or carbon nano tube mixed acrylic resin paint, and the weight percentage content of the acrylic resin paint is 95-99%; the heat insulation layer is an aluminum foil composite aluminum silicate heat insulation layer.
A heat pump air conditioner comprises an indoor heat exchanger, a liquid-vapor separator, a refrigeration compressor, a four-way reversing valve, a second fan for accelerating the heat dissipation of the indoor heat exchanger and the infrared defrosting heat exchanger; the main valve interface of the four-way reversing valve is connected with the refrigeration compressor, and the other three interfaces are respectively connected with the indoor heat exchanger, the liquid-vapor separator and the infrared defrosting heat exchanger; the refrigerating compressor is also connected with the liquid-vapor separator, and the indoor heat exchanger and the infrared defrosting heat exchanger are also connected with each other.
The system further comprises two groups of pressure reducing throttling assemblies which are connected in parallel and have opposite pressure reducing directions, wherein the pressure reducing throttling assemblies are positioned between the indoor heat exchanger and the infrared defrosting heat exchanger; the pressure reducing and throttling assembly is composed of a fifth electromagnetic valve, a thermal expansion valve and a sixth electromagnetic valve which are sequentially connected.
The beneficial effects of the utility model reside in that: during defrosting, the infrared defrosting heat exchanger is provided with an independent working medium circulation path, and the functions of other structures in a system to which the infrared defrosting heat exchanger is applied are not influenced. The infrared radiation plate generates far infrared heat effect and directly acts on the copper pipe, and the copper pipe is transferred to a working medium (refrigerant) in a heat conduction mode. And the working medium driven by the working medium circulating pump circulates between the copper pipe and the reflux path and heats the copper pipe and the fin group integrally to form a defrosting process from inside to outside. The process can ensure thorough defrosting, and the (liquid phase) working medium absorbs heat and turns into a low-pressure gas state, so that the problem that a refrigeration compressor sucks liquid phase refrigerant and is damaged due to liquid impact is avoided, and meanwhile, the phenomenon that the second fan beside the indoor heat exchanger blows out cold air due to stopping supplying heat to the indoor heat exchanger in the conventional reverse circulation defrosting is also avoided.
Drawings
The following detailed description of the specific structure of the present invention with reference to the accompanying drawings
Fig. 1 is a front view of an infrared defrosting heat exchanger of the present invention;
fig. 2 is a side view of an infrared defrosting heat exchanger according to the present invention;
fig. 3 is a schematic view of an internal structure of an infrared defrosting heat exchanger according to the present invention;
fig. 4 is a schematic diagram of an internal structure of an infrared defrosting heat exchanger of the present invention;
FIG. 5 is a schematic view of the heat pump air conditioner using the infrared defrosting heat exchanger according to the present invention;
FIG. 6 is a schematic diagram of the heat pump operation of the heat pump air conditioner using the infrared defrosting heat exchanger of the present invention;
FIG. 7 is a schematic view of the defrosting operation of the heat pump air conditioner using the infrared defrosting heat exchanger of the present invention;
wherein, 1-refrigeration compressor, 2-liquid-vapor separator, 3-four-way reversing valve, 4-indoor heat exchanger, 5-second fan; 61-a fifth electromagnetic valve, 62-a thermostatic expansion valve, 63-a sixth electromagnetic valve; 70-a hood, 71-an infrared radiation plate, 72-a straight pipe part, 73-a U-shaped bent part, 74-a heat insulation layer, 75-a fin, 76-a first fan, 77-a first electromagnetic valve, 78-a second electromagnetic valve, 79-a working medium circulating pump, 80-a third electromagnetic valve and 81-a fourth electromagnetic valve.
Detailed Description
The utility model discloses the most crucial design lies in: far infrared radiation directly acts on the copper pipe to form a defrosting process from inside to outside, so that thorough defrosting is ensured; and an independent working medium circulation path is adopted, so that the defrosting process is ensured not to interfere with other functional structures of the air conditioner.
In order to further explain the feasibility of the inventive concept, the detailed embodiments of the technical contents, the structural features, the objects and the effects according to the invention are described in detail with reference to the accompanying drawings.
Example 1
Referring to fig. 1 to 7, an infrared defrosting heat exchanger includes a copper pipe, an infrared radiation plate 71 for heating the copper pipe, a return line, and a working medium circulating pump 79 for driving a working medium to circularly flow between the copper pipe and the return line.
During defrosting, the infrared defrosting heat exchanger is provided with an independent working medium circulation path, and the functions of other structures in a system to which the infrared defrosting heat exchanger is applied are not influenced. The infrared radiation plate 71 generates a far infrared thermal effect, which directly acts on the copper pipe, and the copper pipe is transferred to the working medium (refrigerant) in a heat conduction manner. The working medium driven by the working medium circulating pump 79 circulates between the copper pipe and the return path and heats the copper pipe as a whole to form a defrosting process from inside to outside. The process can ensure thorough defrosting, avoid the problem that the refrigeration compressor 1 is damaged due to the liquid-phase refrigerant suction and the liquid impact phenomenon, and avoid the phenomenon that the temperature of the indoor space is reduced when the existing heat pump air conditioner adopting reverse circulation defrosting defrosts.
Preferably, the working fluid circulation pump 79 is a diaphragm pump. Diaphragm pumps are a more particular form of positive displacement pump. It relies on the back and forth movement of a diaphragm to vary the volume of the working chamber to draw and expel fluid. The working part of the diaphragm pump mainly comprises a crank connecting rod mechanism, a plunger, a hydraulic cylinder, a diaphragm, a pump body, a suction valve, a discharge valve and the like. When the diaphragm pump works, the crank-link mechanism drives the plunger to do reciprocating motion under the driving of the motor, and the motion of the plunger is transmitted to the diaphragm through working liquid (generally oil) in the hydraulic cylinder, so that the diaphragm is driven to move back and forth. The diaphragm sheet of the diaphragm pump needs to have good flexibility and good corrosion resistance, and is usually made of polytetrafluoroethylene, rubber and other materials. The diaphragm pump has good sealing performance and can easily achieve leakage-free operation. In the technical scheme, the diaphragm pump is applied to refrigeration working medium circulation, and the diaphragm pump has no dynamic sealing structure, so that the risk of leakage of the refrigeration working medium due to the dynamic sealing structure is avoided, and the heat pump air conditioner applying the infrared defrosting heat exchanger has reliable operation performance in defrosting, refrigerating and heating.
On the basis of the above mechanism, the infrared defrosting heat exchanger further comprises a first three-way connecting pipe, a second three-way connecting pipe, a first electromagnetic valve 77, a second electromagnetic valve 78, a third electromagnetic valve 80 and a fourth electromagnetic valve 81; one interface of the first three-way connecting pipe is connected with one end of the copper pipe, one interface is connected with the first electromagnetic valve 77, and the other interface is connected with the second electromagnetic valve 78; one interface of the second three-way connecting pipe is connected with the other end of the copper pipe, one interface is connected with the third electromagnetic valve 80, and the other interface is connected with the fourth electromagnetic valve 81; the second solenoid valve 78 is located between the first three-way connection pipe and the return line, and the third solenoid valve 80 is located between the second three-way connection pipe and the return line; the working medium circulation pump 79 is located on the return line, i.e. the working medium circulation pump 79 is located between the second solenoid valve 78 and the third solenoid valve 80.
During defrosting, the first solenoid valve 77 and the fourth solenoid valve 81 are closed, the second solenoid valve 78 and the third solenoid valve 80 are opened, and the return pipeline is connected with the copper pipe to form a circulation path and is isolated from the external structure of the infrared defrosting heat exchanger.
On the basis of the mechanism, the surface of the copper pipe is provided with an infrared absorption layer. The infrared absorption layer absorbs the far infrared radiation emitted from the infrared radiation plate 71 and transfers the absorbed far infrared radiation to the copper pipe. The copper pipe has good heat-conducting property, so that heat can be quickly transferred to the working medium.
On the basis of the mechanism, the copper pipe is composed of at least three straight pipe parts 72 and at least two U-shaped bent parts 73, and the straight pipe parts 72 and the U-shaped bent parts 73 are alternately connected; all the straight tube parts 72 are parallel to each other and have centers on the same vertical plane; the two infrared radiation plates 71 are perpendicular to the straight pipe part 72 and are positioned beside the U-shaped bent part 73; the copper pipe is positioned between the two infrared radiation plates 71; the infrared absorption layer is located at the U-shaped bent portion 73. The copper pipe is repeatedly bent, and the heat dissipation area is increased. The infrared absorption layer is arranged at the U-shaped bent part 73, the heat dissipation function of the infrared defrosting heat exchanger is not affected, and meanwhile, due to the circulating path formed by the return pipeline and the copper pipe, the whole temperature rise and defrosting of the infrared defrosting heat exchanger can be realized after the working medium flows.
On the basis of the above mechanism, the infrared defrosting heat exchanger further comprises a heat insulation layer 74, and the infrared radiation plate 71 is located between the heat insulation layer 74 and the copper pipe; the insulation layer 74 is perpendicular to the straight tube portion 72. The infrared defrosting heat exchanger is also provided with a hood 70, and the copper pipe, the infrared radiation plate 71, the heat insulation layer 74 and the like are all arranged in the hood 70. Since only one side of the infrared radiation plate 71 faces the copper tube to radiate far infrared energy, and the other side of the infrared radiation plate is in a convection heat conduction phenomenon with the hood 70, the heat insulation layer 74 is arranged to prevent the infrared radiation plate 71 from radiating to the hood 70, and heat loss is reduced.
On the basis of the mechanism, the infrared defrosting heat exchanger further comprises a fin group for heat dissipation and a first fan 76, wherein the straight pipe part 72 sequentially penetrates through each fin 75 in the fin group; the fins 75 are parallel to the infrared radiation plates 71, and the blowing direction of the first fan 76 is perpendicular to the straight tube portions 72, i.e., the air flow passes through the gaps between one fin 75 and the other fin 75. When the infrared defrosting heat exchanger carries out heat exchange, the first fan 76 and the fins 75 accelerate the heat conduction rate; when defrosting is performed, the first fan 76 can blow off a part of the frost which is melted and still hung on the fins 75 and the copper tube, and the frost can be thoroughly defrosted without providing energy for all frost hung on the infrared defrosting heat exchanger, so that the effect of saving energy is achieved.
On the basis of the above mechanism, the infrared radiation plate 71 is composed of a first insulating layer, an infrared radiation generation layer, and a second insulating layer, which are sequentially stacked, and the first insulating layer is hermetically connected to the edge of the second insulating layer. When the power is on, the infrared radiation generation layer generates far infrared radiation.
On the basis of the mechanism, the infrared radiation generation layer is made of one or more materials of conductive carbon black, micro-nano graphite powder, carbon nano fibers, carbon nano tubes and graphene, and has the effect of radiating far infrared energy. Preferably, the infrared radiation generation layer contains graphene. The first insulating layer and the second insulating layer are both made of one or more materials of polyethylene glycol terephthalate, ethylene-vinyl acetate copolymer, polydiallyl diglycol carbonate, a silicone rubber layer and polyimide resin, and the infrared radiation generation layer is prevented from being oxidized and the electric leakage is prevented. The infrared absorption layer is made of graphene and/or carbon nano tube mixed acrylic resin paint, and the weight percentage content of the acrylic resin paint is 95-99%. Preferably, the infrared absorption layer is composed of acrylic resin paint and carbon nanotubes, and the ratio of the acrylic resin paint to the carbon nanotubes is 97: 3. The heat insulation layer 74 is an aluminum foil composite aluminum silicate heat insulation layer, belongs to a mature industrial product, and only needs an aluminum foil composite aluminum silicate heat insulation felt product manufactured by a professional manufacturer. The graphene and carbon nanotube film has strong absorption effect on infrared spectrum, and the absorption coefficient reaches 98%. The acrylic resin paint is widely used in the fields of automobiles, aviation, medical instruments, furniture and the like, and has excellent color, color retention, light retention, heat resistance, chemical resistance and other properties.
Example 2
Referring to fig. 5 to 7, a heat pump air conditioner includes an indoor heat exchanger 4, a liquid-vapor separator 2, a refrigeration compressor 1, a four-way reversing valve 3, a second fan 5 for accelerating heat dissipation of the indoor heat exchanger 4, and the infrared defrosting heat exchanger; the main valve interface of the four-way reversing valve 3 is connected with the refrigeration compressor 1, and the other three interfaces are respectively connected with the indoor heat exchanger 4, the liquid-vapor separator 2 and the infrared defrosting heat exchanger; the refrigeration compressor 1 is also connected with the liquid-vapor separator 2, and the indoor heat exchanger 4 is also connected with the infrared defrosting heat exchanger.
On the basis of the mechanism, the heat pump air conditioner also comprises two groups of pressure reducing throttling components which are connected in parallel and have opposite pressure reducing directions, and the pressure reducing throttling components are positioned between the indoor heat exchanger 4 and the infrared defrosting heat exchanger; the pressure reducing and throttling assembly is composed of a fifth electromagnetic valve 61, a thermal expansion valve 62 and a sixth electromagnetic valve 63 which are connected in sequence.
The other end of the first electromagnetic valve 77, which is connected with the first three-way connecting pipe, is connected with the four-way reversing valve 3, and the other end of the fourth electromagnetic valve 81, which is connected with the second three-way connecting pipe, is connected with the fifth electromagnetic valve 61 in one group of pressure reducing throttling components and the sixth electromagnetic valve 63 in the other group of pressure reducing throttling components through a third three-way connecting pipe respectively.
The refrigeration compressor 1 is used for compressing a refrigerant (working medium) from low pressure to high pressure in a vapor compression refrigeration system and enabling the refrigerant to continuously flow circularly, so that the system continuously discharges internal heat to an environment with the temperature higher than the temperature of the system. Many types of compressors have been commercially produced, and the refrigeration compressor 1 may be classified into a displacement compressor and a screw compressor according to the operating principle. (1) The displacement compressor realizes the processes of steam suction, compression, steam exhaust and the like by changing the volume of a working cavity. The positive displacement compressor includes two main series of reciprocating compressor and rotary compressor. (2) The screw compressor is a rotary positive displacement compressor, which uses the change of the tooth space volume and position of the screw to complete the processes of vapor suction, compression and exhaust.
The heat pump thermostatic expansion valve 62 realizes pressure drop from condensation pressure to evaporation pressure in the refrigeration system and controls the flow of the refrigerant; the refrigeration equipment realizes the automatic regulation of the refrigeration system by controlling the degree of superheat through a thermostatic expansion valve 62. The main functions of the thermostatic expansion valve 62 include a throttling function, i.e., the liquid refrigerant at high temperature and high pressure is throttled by an orifice of the expansion valve and then turns into a mist-like liquid refrigerant at low temperature and low pressure, which is a specific condition for evaporating the refrigerant in the refrigeration system. The refrigerating system controls the flow of the refrigerant, the liquid refrigerant entering the evaporator is evaporated into a gaseous state from the liquid state after passing through the evaporator, the heat is absorbed, and the temperature of the environment is reduced. The expansion valve controls the flow of the refrigerant, ensures that the outlet of the evaporator is completely gaseous refrigerant, and if the flow is overlarge, the outlet contains liquid refrigerant, and if the refrigerant enters the compressor, the phenomenon of liquid impact is generated; if the flow of the refrigerant is too small, the evaporation is finished in advance, and the refrigeration is insufficient. The thermal expansion valve 62 is a key component of a refrigeration system, belongs to a mature industrial product, and is selected according to the technical standard of the thermal expansion valve 62 for refrigeration of JB/T3548 and 2013.
The four-way reversing valve 3 is a special valve for changing the flow direction of the refrigerant and converting the functions of the winter/summer two-season air conditioning system by changing the flow channel of the refrigerant. In summer, the refrigerant liquid is evaporated and absorbs heat in the indoor heat exchanger 4 (the evaporator in this case) to become gas, and releases heat in the outdoor heat exchanger (the condenser in this case) for indoor cooling; in winter, the refrigerant liquid evaporates in the outdoor heat exchanger (in this case, the evaporator) to absorb external heat, and releases heat in the indoor heat exchanger 4 (in this case, the condenser) to supply heat indoors. The four-way reversing valve 3 belongs to a mature industrial product and is selected according to the technical quality standard of the four-way reversing valve 3 of GB/T25126-2010.
The heat pump air conditioner applying the infrared defrosting heat exchanger has three working condition modes, including a refrigeration air conditioner working condition mode, a heating heat pump working condition mode and a defrosting working condition mode.
(1) The working condition modes of the refrigeration air conditioner are shown in fig. 5:
when the refrigeration compressor 1 works, high-temperature and high-pressure refrigeration working medium steam is output, enters the four-way reversing valve 3, passes through the four-way reversing valve 3 and enters the infrared defrosting heat exchanger through the first electromagnetic valve 77 (gas stop valve). In the infrared defrosting heat exchanger, a fan works to enable the heat-conducting fin group to radiate heat under the action of forced convection, and high-pressure refrigeration working medium steam is condensed to high-pressure liquid through a copper pipe. The high-pressure liquid passes through the fifth solenoid valve 61 (electromagnetic shut-off valve) into the thermostatic expansion valve 62 after exiting from the fourth solenoid valve 81 (condensate conduit valve). After decompression and throttling by the thermostatic expansion valve 62, the refrigerant liquid enters the indoor heat exchanger 4 through a sixth electromagnetic valve 63 (low-pressure open-close valve). The decompressed and throttled refrigerating liquid exchanges heat with the forced convection air of the second fan 5 in the indoor heat exchanger 4, the indoor air is cooled, and meanwhile, the refrigerating liquid is changed from a liquid state to a low-pressure gaseous state. The low-pressure gaseous refrigerant flows into the liquid-vapor separator 2 via the four-way selector valve 3. The liquid-vapor separator 2 separates the refrigerant that has not sufficiently changed from a liquid phase to a low-pressure gaseous phase. And the low-pressure gaseous refrigerant is sucked by the refrigeration compressor 1, then compressed and enters the infrared defrosting heat exchanger again through the four-way reversing valve 3 and the first electromagnetic valve 77. The working condition mode of the refrigeration air conditioner is circulated repeatedly according to the flow, so that the purpose of room air conditioning is achieved.
Under the working condition of the refrigeration air conditioner, the decompression and throttling assembly of the other group is in a closed state, namely, a fifth electromagnetic valve 61 (a heating medium stop valve) and a sixth electromagnetic valve 63 (a low-pressure stop valve) in the decompression and throttling assembly are closed, and the thermal expansion valve 62 stops working. Meanwhile, the second solenoid valve 78 (thermal fluid on-off valve) and the third solenoid valve 80 (thermal fluid solenoid valve) in the infrared defrosting heat exchanger are also in a closed state.
(2) Heating heat pump operating mode, please refer to fig. 6:
when the refrigeration compressor 1 works, high-temperature and high-pressure refrigeration working medium steam is output and enters the indoor heat exchanger 4 after passing through the four-way reversing valve 3. Under the action of forced convection of the second fan 5, high-temperature and high-pressure refrigeration working medium steam exchanges heat with the convective air in the indoor heat exchanger 4, and the indoor air is heated; at the same time, the high-pressure refrigerant vapor is condensed to a high-pressure liquid in the indoor heat exchanger 4. The high-pressure liquid enters the thermostatic expansion valve 62 through the fifth electromagnetic valve 61 (heat medium stop valve), and is decompressed and throttled into a low-pressure condensate fluid by the decompression and throttling action of the thermostatic expansion valve 62. The low-pressure condensate fluid sequentially passes through a sixth solenoid valve 63 (a low-pressure solenoid valve) and a fourth solenoid valve 81 and enters a copper pipe of the infrared defrosting heat exchanger for circulation. In the infrared defrosting heat exchanger, a fan works to enable the heat-conducting fin group to absorb heat in air under the action of forced convection, and low-pressure condensate liquid is changed into low-pressure gaseous state. The low-pressure gas flows into the liquid-vapor separator 2 sequentially through the first solenoid valve 77 (gas shutoff valve) and the four-way selector valve 3. The liquid-vapor separator 2 separates the liquid refrigerant that is not sufficiently changed from the liquid phase to the low-pressure gaseous refrigerant, which is sucked and recompressed by the refrigerant compressor 1. The working condition mode of the heating heat pump is that the circulation is repeated according to the flow, so that the purpose of heating the room is achieved.
Under the working condition of the heating heat pump, the pressure reducing and throttling assembly of the other group is in a closed state, namely, the fifth electromagnetic valve 61 (heating medium stop valve) and the sixth electromagnetic valve 63 (low-pressure stop valve) in the pressure reducing and throttling assembly are closed, and the thermal expansion valve 62 stops working. In the infrared defrosting heat exchanger, the second solenoid valve 78 (thermal fluid on-off valve) and the third solenoid valve 80 (thermal fluid solenoid valve) are also in a closed state.
Under the working condition of a heating heat pump, the opened decompression throttling component is the decompression throttling component closed under the working condition of a refrigeration air conditioner, and under the working condition of the refrigeration air conditioner, the opened decompression throttling component is the decompression throttling component closed under the working condition of the heating heat pump.
(3) Defrosting mode, please refer to fig. 7:
under the working condition of the heating heat pump, when the frosting phenomenon is formed on the infrared defrosting heat exchanger, the defrosting working condition mode needs to be started. At this time, the heat transfer resistance of the infrared defrosting heat exchanger is increased, the air flow is reduced, and the heat exchange capacity is reduced.
The first solenoid valve 77, the second solenoid valve 78, the refrigeration compressor 1 and the second fan 5 are closed. And the second electromagnetic valve 78, the third electromagnetic valve 80, the working medium circulating pump 79 and the infrared radiation plate 71 are opened, and after the U-shaped bent part 73 of the copper pipe is heated by the infrared radiation plate 71, the refrigerant in the pipe is conducted to rise the temperature. Under the action of the circulating pump of the working medium circulating pump 79, all the refrigerants in the copper pipe are heated. Due to the heat conduction effect of the fins and the copper pipe, temperature rise from inside to outside is formed, and frosting on the outer portion of the infrared defrosting heat exchanger begins to melt from the inside. And finally, peeling from the surfaces of the copper pipe and the fin under the blowing action of the fan, so as to achieve the purpose of thorough defrosting.
After defrosting is finished, the second electromagnetic valve 78, the working medium circulating pump 79, the third electromagnetic valve 80 and the infrared radiation plate 71 are closed; the operation of the heating heat pump working condition mode can be recovered by opening the first electromagnetic valve 77, the fourth electromagnetic valve 81, the refrigeration compressor 1 and the second fan 5. During defrosting, because the infrared defrosting heat exchanger is provided with an independent working medium circulation path, and the connection between the infrared defrosting heat exchanger and the refrigerating compressor 1 and the indoor heat exchanger 4 in the heat pump air conditioner is cut off, when the infrared defrosting heat exchanger is defrosting, the indoor heat exchanger 4 can not blow out cold air, and the refrigerating compressor 1 can not generate liquid impact phenomenon because of sucking a liquid refrigerator, namely, the defrosting process can not influence heating and heating, and the refrigerating compressor 1 is in a shutdown protection state. After the second fan 5 is turned off, the indoor temperature can be prevented from being lowered.
To sum up, the utility model provides a pair of infrared defrosting heat exchanger is applied to the heat pump air conditioner in, when changing over to the defrosting operating mode from heating heat pump operating mode, because infrared defrosting heat exchanger self has independent working medium circulation path to do not influence the function of other structures in the heat pump air conditioner system. The infrared radiation plate generates far infrared heat effect and directly acts on the copper pipe, and the copper pipe is transferred to a working medium (refrigerant) in a heat conduction mode. And the working medium driven by the working medium circulating pump circulates between the copper pipe and the reflux path and heats the copper pipe and the fin group integrally to form a defrosting process from inside to outside. Because the defrosting process takes place from inside to outside, the first fan can blow away the frost which is melted by heat but is completely melted, and the total heat required by defrosting is reduced. The process can ensure thorough defrosting, the heat absorbed by the working medium is converted into a low-pressure gas state, the problem that a refrigeration compressor sucks liquid-phase refrigerant and is damaged due to liquid impact is avoided, and meanwhile, the phenomenon that the second fan beside the indoor heat exchanger blows out cold air due to stopping supplying heat to the indoor heat exchanger in the conventional reverse circulation defrosting is also avoided.
The first … … and the second … … are only used for name differentiation and do not represent how different the importance and position of the two are.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. The infrared defrosting heat exchanger comprises a copper pipe, and is characterized by further comprising an infrared radiation plate for heating the copper pipe, a return pipeline and a working medium circulating pump for driving working media to circularly flow between the copper pipe and the return pipeline.
2. The infrared defrosting heat exchanger of claim 1 further comprising a first three-way connection, a second three-way connection, a first solenoid valve, a second solenoid valve, a third solenoid valve and a fourth solenoid valve; one interface of the first three-way connecting pipe is connected with one end of the copper pipe, one interface of the first three-way connecting pipe is connected with the first electromagnetic valve, and the other interface of the first three-way connecting pipe is connected with the second electromagnetic valve; one interface of the second three-way connecting pipe is connected with the other end of the copper pipe, one interface of the second three-way connecting pipe is connected with the third electromagnetic valve, and the other interface of the second three-way connecting pipe is connected with the fourth electromagnetic valve; the second electromagnetic valve is positioned between the first three-way connecting pipe and the return pipeline, and the third electromagnetic valve is positioned between the second three-way connecting pipe and the return pipeline; the working medium circulating pump is positioned on the return pipeline.
3. The infrared defrosting heat exchanger of any one of claims 1 or 2 wherein the surface of the copper tube is provided with an infrared absorbing layer.
4. The infrared defrosting heat exchanger of claim 3 wherein the copper tube is comprised of at least three straight tube portions and at least two U-shaped bent portions, and the straight tube portions and the U-shaped bent portions are alternately connected; all the straight pipe parts are parallel to each other, and the centers of the straight pipe parts are positioned on the same vertical surface; the two infrared radiation plates are perpendicular to the straight pipe part and are positioned beside the U-shaped bent part; the copper pipe is positioned between the two infrared radiation plates; the infrared absorption layer is located at the U-shaped bending part.
5. The infrared defrosting heat exchanger of claim 4 further comprising a thermal insulating layer, the infrared radiation plate being located between the thermal insulating layer and the copper tube; the heat insulating layer is perpendicular to the straight pipe portion.
6. The infrared defrosting heat exchanger of claim 5 further comprising a fin group for heat dissipation and a first fan, the straight tube portion sequentially penetrating each fin in the fin group; the fins are parallel to the infrared radiation plates, and the blowing direction of the first fan is perpendicular to the straight tube portions.
7. The infrared defrosting heat exchanger of claim 6, wherein the infrared radiation plate is composed of a first insulating layer, an infrared radiation generating layer and a second insulating layer which are sequentially laminated, and the first insulating layer is hermetically connected with an edge of the second insulating layer.
8. The infrared defrosting heat exchanger of claim 7, wherein the infrared radiation generating layer is made of one or more materials selected from conductive carbon black, micro-nano graphite powder, carbon nanofiber, carbon nanotube and graphene; the first insulating layer and the second insulating layer are both made of one or more materials of polyethylene terephthalate, ethylene-vinyl acetate copolymer, polydiallyl diglycol carbonate, a silicone rubber layer and polyimide resin; the infrared absorption layer is made of graphene and/or carbon nano tube mixed acrylic resin paint; the heat insulation layer is an aluminum foil composite aluminum silicate heat insulation layer.
9. A heat pump air conditioner is characterized by comprising an indoor heat exchanger, a liquid-vapor separator, a refrigeration compressor, a four-way reversing valve, a second fan for accelerating the heat dissipation of the indoor heat exchanger and the infrared defrosting heat exchanger as claimed in any one of claims 1 to 7; the main valve interface of the four-way reversing valve is connected with the refrigeration compressor, and the other three interfaces are respectively connected with the indoor heat exchanger, the liquid-vapor separator and the infrared defrosting heat exchanger; the refrigerating compressor is also connected with the liquid-vapor separator, and the indoor heat exchanger and the infrared defrosting heat exchanger are also connected with each other.
10. The heat pump air conditioner according to claim 9, further comprising two sets of decompression throttle packs connected in parallel and having decompression directions opposite to each other, the decompression throttle packs being located between the indoor heat exchanger and the infrared defrosting heat exchanger; the pressure reducing and throttling assembly is composed of a fifth electromagnetic valve, a thermal expansion valve and a sixth electromagnetic valve which are sequentially connected.
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| CN202021346645.8U CN212378342U (en) | 2020-07-09 | 2020-07-09 | Infrared defrosting heat exchanger and heat pump air conditioner adopting same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114857806A (en) * | 2022-05-05 | 2022-08-05 | 山东和同信息科技股份有限公司 | Multi-energy complementary air source heat pump system with defrosting function |
| CN114953914A (en) * | 2022-06-20 | 2022-08-30 | 一汽解放汽车有限公司 | Vehicle air conditioning system, vehicle air conditioning control method and vehicle |
-
2020
- 2020-07-09 CN CN202021346645.8U patent/CN212378342U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114857806A (en) * | 2022-05-05 | 2022-08-05 | 山东和同信息科技股份有限公司 | Multi-energy complementary air source heat pump system with defrosting function |
| CN114857806B (en) * | 2022-05-05 | 2023-07-14 | 山东和同信息科技股份有限公司 | Multifunctional complementary air source heat pump system with defrosting function |
| CN114953914A (en) * | 2022-06-20 | 2022-08-30 | 一汽解放汽车有限公司 | Vehicle air conditioning system, vehicle air conditioning control method and vehicle |
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