CN115127257A - Non-uniform arrangement structure and method for L-shaped finned tube heat exchanger of air source heat pump - Google Patents
Non-uniform arrangement structure and method for L-shaped finned tube heat exchanger of air source heat pump Download PDFInfo
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- CN115127257A CN115127257A CN202210760647.9A CN202210760647A CN115127257A CN 115127257 A CN115127257 A CN 115127257A CN 202210760647 A CN202210760647 A CN 202210760647A CN 115127257 A CN115127257 A CN 115127257A
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- heat exchange
- finned tube
- exchange assembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention relates to the technical field of air source heat exchange, in particular to a non-uniform arrangement structure and a non-uniform arrangement method for an L-shaped finned tube heat exchanger of an air source heat pump. The purpose is that the intake of solving traditional heat exchanger is different to lead to frosting thickness inequality, prevents simultaneously that the refrigerant from flowing inequality and frosting inhomogeneous and causing the shortcoming of heat waste at the defrosting in-process. The invention comprises a heat pump shell and the like; the finned tube heat exchange assembly is arranged inside the heat pump shell, and the heat exchange assembly is arranged on the inner bottom surface of the heat pump shell. According to the invention, the air inlet quantity passing through the finned tube heat exchange assembly is changed through the non-uniform arrangement of the finned tube heat exchange assembly, so that the frosting of the finned tube heat exchange assembly is more uniform, the heat exchange states of the finned tube heat exchange assembly in different climatic environments are changed under the matching of the state switching assembly, the frosting is more uniform on the premise of ensuring the maximum heat exchange efficiency of the finned tube heat exchange assembly, and the state switching assembly is matched with the state of the finned tube heat exchange assembly during defrosting, so that the heat waste is reduced in the defrosting process.
Description
Technical Field
The invention relates to the technical field of air source heat exchange, in particular to a non-uniform arrangement structure and a non-uniform arrangement method for an L-shaped finned tube heat exchanger of an air source heat pump.
Background
In order to realize the purposes of carbon peak reaching and carbon neutralization, low-carbon transformation has become irreversible and great potential, such as coal-to-electricity promotion, vigorous development of clean energy and the like, the specific gravity of fire coal in a heating heat source of a northern town is as high as 70-80%, energy consumed by heating still takes the coal as a main part, and the realization of the double-carbon target is challenged.
The air source heat pump is easily affected by environmental meteorological parameters in the operation process, particularly in low-temperature environment in winter, when the surface temperature of a heat exchanger is lower than the dew point temperature of outdoor vapor, condensed water is generated, if the surface temperature of the heat exchanger is lower than 0 ℃, a frost layer is formed on the surface of the heat exchanger, the frost layer can form thermal resistance on the heat exchanger, and air circulation resistance is increased, so that the working point of a fan deviates and the heat exchange is not facilitated, and therefore, the defrosting is necessary work, the reverse circulation defrosting method is a commonly adopted defrosting method, the flowing direction of a working medium is changed through a four-way reversing valve, heat is transmitted to the heat exchanger for defrosting, but the method has the problems of poor room comfort, long defrosting time, poor system operation reliability, high energy consumption and the like in defrosting, in addition, the defrosting also has the problem of uneven frosting, on one hand, the liquid in the heat exchanger is unevenly distributed, frost formation is prone to occur in places with much refrigerant; on the other hand, due to the problem of the flow field, when the fan works, the air quantity flowing through the middle part of the heat exchanger is large, the air quantity flowing through the two end parts is small, the two end parts are easy to frost due to the vortex of the flow field, so that the frosting is uneven, and the thicker frosting increases the defrosting time.
Disclosure of Invention
In order to overcome the defects that the frosting thickness is uneven due to different air intake of the traditional heat exchanger, and the heat waste caused by uneven flow and uneven frosting of the refrigerant is prevented in the defrosting process, the invention has the technical problems that: an adjustable air source heat pump L-shaped finned tube heat exchanger non-uniform arrangement structure and method are provided.
The technical scheme is as follows: a non-uniform arrangement structure of an L-shaped finned tube heat exchanger of an air source heat pump comprises a heat pump shell, wherein four through holes are formed in the circumferential direction of the heat pump shell, a sealing cover is fixedly installed on the left side face of the heat pump shell, a fixing frame is arranged inside the heat pump shell and fixedly connected with the upper surface of the heat pump shell, a fan is fixedly installed in the fixing frame and penetrates through the upper side face of the heat pump shell to be communicated with the outside, a finned tube heat exchange assembly is arranged inside the heat pump shell and used for exchanging heat between a refrigerant and outside air, a heat exchange assembly is arranged on the inner bottom face of the heat pump shell and communicated with the heat exchange assembly, the refrigerant circulates inside the heat exchange assembly, circulating water circulates inside the heat exchange assembly, a supporting block is fixedly connected to the left inside of the heat pump shell and used for exchanging heat between the circulating water inside the heat exchange assembly and the refrigerant, under the action of the finned tube heat exchange assembly, the refrigerant exchanges heat with external air, and the finned tube heat exchange assembly is matched with the heat exchange assembly to exchange heat to water flowing through the heat exchange assembly.
Furthermore, the front side face, the rear side face and the right side face of the heat pump shell are respectively provided with an air inlet mesh grid, and the air inlet mesh grids are used for protecting and preventing dust of parts in the heat pump shell.
Furthermore, a drain hole is formed in the circumferential direction of the bottom of the heat pump shell and used for draining the melted water in the heat pump shell.
Further, finned tube heat exchange assembly is including the backup pad, the backup pad is provided with six groups, every group backup pad is provided with a plurality of respectively, a plurality of backup pad slides respectively and sets up inside the heat pump shell body, adjacent two backup pads looks crisscross and sliding connection between adjacent two sets of, equal fixedly connected with a plurality of L type finned tube between every group backup pad, the equal fixed mounting and the intercommunication of both ends of the three L type finned tubes of upside have first tandem, the equal fixed mounting and the intercommunication of both ends of the two sets of L type finned tubes of front and back both sides have the second tandem, the both ends of a set of L type finned tube on right side communicate with adjacent second tandem respectively, adjacent first tandem and second tandem pass through high pressure hose intercommunication, the equal rigid coupling in upper end of the three L type finned tubes of downside is taken over has the fixed plate.
Furthermore, two adjacent L-shaped finned tubes are staggered, and the L-shaped finned tubes are cylindrical, so that the matching has higher space utilization rate.
Furthermore, the position where the two adjacent support plates do not intersect is an end heat exchange portion, the position where the two adjacent support plates intersect is a cross heat exchange portion, the distance from the upper end to the lower end of the two adjacent support plates is H, the cross heat exchange portion occupies 1/3-9/10H, and the end heat exchange portion occupies 1/20-1/3H.
Further, the absolute values of the working pressure differences between two adjacent second series pipes are the same.
Further, the heat exchange assembly is including the connecting pipe, the connecting pipe is provided with two, two connecting pipes are located heat pump housing left front and right back diagonal angle respectively, the one end of two connecting pipes respectively with adjacent second tandem pipe intercommunication, the other end of two connecting pipes communicates respectively has the cross valve, vapour and liquid separator, compressor and condenser all are provided with two and circumference symmetry, adjacent vapour and liquid separator and compressor intercommunication, adjacent compressor and condenser intercommunication, the cross valve respectively with adjacent vapour and liquid separator, compressor and condenser intercommunication, be provided with two water pipes between two condensers and the outside water tank, a water pipe is intake, another water pipe goes out water.
Further, the device comprises a state switching assembly, the state switching assembly is arranged on a fixed frame and is used for switching the state of the finned tube heat exchange assembly according to the outside temperature, the state switching assembly is fixedly connected with the finned tube heat exchange assembly and comprises four electric hydraulic push rods, the four electric hydraulic push rods are respectively and fixedly connected on the fixed frame, the telescopic ends of the two left electric hydraulic push rods are respectively and fixedly connected with a first connecting plate, the telescopic ends of the two right electric hydraulic push rods are respectively and fixedly connected with a second connecting plate, the first connecting plate and the second connecting plate are respectively and fixedly connected with adjacent fixed plates, the upper ends of the upper three groups of supporting plates are respectively and fixedly connected with a baffle, the lower ends of the lower three groups of supporting plates are respectively and fixedly connected with a baffle, the baffle penetrates through the heat pump shell and is in sliding connection with the heat pump shell, and the inner side surfaces of the baffles are respectively and fixedly connected with fixed rods, racks are respectively arranged on two sides of the fixed rod, two rack racks are fixedly connected to the upper side of each fixed plate, straight gears are rotatably connected to the front side face, the rear side face and the right side face of the fixed frame through rotating shafts respectively, and the straight gears are meshed with the adjacent fixed rods and the rack racks respectively.
Further, the method for non-uniformly arranging the L-shaped finned tube heat exchanger of the air source heat pump comprises the following steps of:
s1: under the fixing action of the state switching assembly, the non-uniform arrangement of the finned tube heat exchange assembly is completed, then the fan and the heat exchange assembly are fixedly installed in the heat pump shell, then the finned tube heat exchange assembly is communicated with the interior of the heat exchange assembly and circulates refrigerants, and finally the heat exchange assembly is communicated with an external water tank to circulate water;
s2: when an air heat source pump is started to heat circulating water in a water tank, firstly, a heat exchange assembly is started, a refrigerant starts to circulate in a finned tube heat exchange assembly and the heat exchange assembly, and meanwhile, a fan is started, the fan drives air to circumferentially enter a heat pump shell and then discharge the air outwards, the air exchanges heat with the finned tube heat exchange assembly in the process, and heat is transferred to the circulating water circulating in the heat exchange assembly through the refrigerant to heat the circulating water;
s3: when defrosting is performed, the fan is turned off, external circulating water flows reversely, the refrigerant in the finned tube heat exchange assembly flows reversely through the heat exchange assembly, frosting on the surface of the finned tube heat exchange assembly is removed through the heat of the circulating water, the flowing directions of the refrigerant in the finned tube heat exchange assembly and the circulating water in the heat exchange assembly are recovered after defrosting is completed, and the fan is restarted to operate;
s4: in order to match the climatic environment of each region, the non-uniform arrangement state of the finned tube heat exchange assembly is selected through the state switching assembly, so that the effect of uniform frosting is realized, and meanwhile, the state switching assembly is matched with the state change of the finned tube heat exchange assembly in the defrosting process, so that the influence of the air volume and the external temperature on the finned tube heat exchange assembly is reduced.
Compared with the prior art, the invention has the following advantages: the invention changes the air intake passing through the finned tube heat exchange assembly through the non-uniform arrangement of the finned tube heat exchange assembly, reduces the air quantity passing through the cross heat exchange part by changing the vortex gas flow field of the heat exchange part at the end, leads the frosting of the L-shaped finned tube to be more uniform, reduces the heat waste in the defrosting process, transfers the heat absorbed in the finned tube heat exchange assembly to the circulating water in the heat exchange assembly through the refrigerant circulating between the finned tube heat exchange assembly and the heat exchange assembly, changes the heat exchange states of the finned tube heat exchange assembly under different climatic environments under the coordination of the state switching assembly, leads the frosting to be more uniform under the premise of ensuring the maximum heat exchange efficiency of the finned tube heat exchange assembly by matching with the influences of different air humidity and wind power, and leads the state switching assembly to be matched with the state of the finned tube heat exchange assembly under the defrosting state, the heat waste of the circulating water is reduced again in the defrosting process.
Drawings
Fig. 1 is a schematic perspective view of the present invention.
Fig. 2 is a schematic left side perspective view of the present invention.
Fig. 3 is a partial perspective view of the present invention.
FIG. 4 is a schematic perspective view of the finned tube heat exchange assembly of the present invention.
Fig. 5 is an enlarged schematic perspective view of the invention at a.
FIG. 6 is a schematic partial perspective view of the finned tube heat exchange assembly of the present invention.
FIG. 7 is a side plan view of the support plate of the present invention.
Fig. 8 is a perspective view of the heat exchange assembly of the present invention.
Wherein the figures include the following reference numerals: 1-heat pump shell, 2-closing cap, 3-fixing frame, 4-air inlet grid, 5-fan, 6-finned tube heat exchange assembly, 601-supporting plate, 602-L-shaped finned tube, 603-first serial connection tube, 604-second serial connection tube, 605-fixing plate, 606-end heat exchange part, 607-cross heat exchange part, 7-state switching assembly, 701-electric hydraulic push rod, 702-first connection plate, 703-second connection plate, 704-baffle, 705-fixing rod, 706-rack frame, 707-straight gear, 8-heat exchange assembly, 801-connecting tube, 802-four-way valve, 803-gas-liquid separator, 804-compressor, 805-condenser, 806-water tube, 9-supporting block, 10-drainage holes.
Detailed Description
Although the present invention may be described with respect to a particular application or industry, those skilled in the art will recognize the broader applicability of the invention. Those of ordinary skill in the art will recognize other factors such as: terms such as above, below, upward, downward, and the like are used to describe the accompanying drawings and are not meant to limit the scope of the invention, which is defined by the appended claims. Such as: any numerical designation of first or second, and the like, is merely exemplary, and is not intended to limit the scope of the invention in any way.
Example 1
A non-uniform arrangement structure of an L-shaped finned tube heat exchanger of an air source heat pump is disclosed, as shown in figures 1-8, and comprises a heat pump shell 1, four through holes are arranged on the circumference of the heat pump shell 1, a sealing cover 2 is arranged on the left side surface of the heat pump shell 1 through bolts, a fixing frame 3 is arranged in the heat pump shell 1, the fixing frame 3 is welded with the upper surface of the heat pump shell 1, air inlet grids 4 are respectively arranged on the front side surface, the rear side surface and the right side surface of the heat pump shell 1 through bolts, the air inlet grids 4 are used for protecting and preventing dust of parts in the heat pump shell 1 so as to protect the finned tube heat exchange assembly 6 in severe weather and prevent internal parts from being damaged or blocked to reduce heat exchange efficiency, a fan 5 is fixedly arranged in the fixing frame 3, the fan 5 penetrates through the upper side surface of the heat pump shell 1 to be communicated with the outside, and the finned tube heat exchange assembly 6 is arranged in the heat pump shell 1 in a sliding manner, the finned tube heat exchange assembly 6 is used for exchanging heat between a refrigerant and outside air, a heat exchange assembly 8 is fixedly installed on the inner bottom surface of the heat pump shell 1, the finned tube heat exchange assembly 6 is communicated with the heat exchange assembly 8, the refrigerant is used for transferring and exchanging heat, circulating water flows inside the heat exchange assembly 8, the heat is stored or defrosted by using the heat of the circulating water through the circulating water, a supporting block 9 is welded at the left part inside the heat pump shell 1, the heat exchange assembly 8 is used for exchanging heat between the circulating water inside the heat exchange assembly 8 and the refrigerant, the refrigerant exchanges heat with the outside air under the action of the finned tube heat exchange assembly 6, the finned tube heat exchange assembly 6 is matched with the heat exchange assembly 8 to supply heat to water flowing through the heat exchange assembly 8, a drain hole 10 is circumferentially formed in the bottom of the heat pump shell 1, and the drain hole 10 is used for draining the melt water inside the heat pump shell 1, a large amount of water droplets generated during defrosting are prevented from remaining frozen in the heat pump casing 1.
In a normal working state, the air source heat pump absorbs heat in outside air to provide heat for circulating water so as to extract and utilize the heat of an air source, after the air source heat pump is started, a refrigerant starts to circulate in the finned tube heat exchange assembly 6 and the heat exchange assembly 8, the fan 5 is also started to enable air to pass through the circumferential through holes of the heat pump shell 1 and to be discharged from the top of the heat pump shell 1 after being exchanged with the heat of the finned tube heat exchange assembly 6, the refrigerant absorbs the heat of the air passing through the finned tube heat exchange assembly 6 after passing through the finned tube heat exchange assembly 6, the heat enables the refrigerant to be heated, the heat is transferred to the circulating water through the heat exchange assembly 8 under the action of the refrigerant, because the air source heat pump works outdoors for a long time, when the outdoor temperature is low, the heat exchange process with the air source can frost on the finned tube heat exchange assembly 6, and therefore, under the outdoor low-temperature environment, need defrost the finned tube heat exchange assembly 6 after working for a period of time, change the circulating water flow direction through heat exchange assembly 8 this moment, make heat transport finned tube heat exchange assembly 6 be used for the defrosting, the inhomogeneous setting of the inside heat transfer part of finned tube heat exchange assembly 6 adjusts the intake and through the uneven problem of the interior refrigerant of finned tube heat exchange assembly 6, avoided the inhomogeneous condition of frosting as far as possible, reduced the defrosting degree of difficulty to finned tube heat exchange assembly 6.
Example 2
On the basis of embodiment 1, as shown in fig. 4 to 6, the finned tube heat exchange assembly 6 includes support plates 601, six sets of support plates 601 are provided, each set of support plates 601 is provided with a plurality of support plates 601, the plurality of support plates 601 are slidably provided inside the heat pump housing 1, two adjacent support plates 601 between two adjacent sets are staggered and slidably connected, a plurality of L-shaped finned tubes 602 are fixedly installed between each set of support plates 601, the support plates 601 play a role of fixedly supporting the L-shaped finned tubes 602, two adjacent L-shaped finned tubes 602 are staggered, the L-shaped finned tubes 602 are cylindrical, so that the space utilization rate is higher, meanwhile, the channels for air intake are changed by staggering arrangement, on the premise of ensuring a larger contact area, two or more sets of overlapped finned tubes 602 play a role of increasing the wind resistance, the two ends of three sets of L-shaped finned tubes 602 on the upper side are fixedly installed and communicated with a first connecting tube 603, two ends of two groups of L-shaped finned tubes 602 on the front side and the rear side are fixedly installed and communicated with second serial connection tubes 604, the first serial connection tube 603 and the second serial connection tubes 604 are used for converging refrigerants circulating through the L-shaped finned tubes 602, under the condition that the internal pressures of the two groups of L-shaped finned tubes are in serial connection and are the same, the refrigerant quantity flowing through the L-shaped finned tubes 602 is the same, two ends of one group of L-shaped finned tubes 602 on the right side are respectively communicated with the adjacent second serial connection tubes 604, the adjacent first serial connection tube 603 and the second serial connection tube 604 are communicated through high-pressure hoses, and the working pressure difference between the adjacent two second serial connection tubes 604 is the same in absolute value, so that the refrigerants circulating in the L-shaped finned tubes 602 can be ensured to uniformly circulate, and the upper ends of the lower three groups of L-shaped finned tubes 602 are fixedly connected with fixing plates 605.
As shown in fig. 7, the position where two adjacent supporting plates 601 do not cross is an end heat exchanging portion 606, the position where two adjacent supporting plates 601 cross is a cross heat exchanging portion 607, and the distance from the upper end to the lower end of two adjacent supporting plates 601 is H, so that the cross heat exchanging portion 607 occupies 1/3-9/10H, and the end heat exchanging portion 606 occupies 1/20-1/3H.
Aiming at the arrangement of the finned tube heat exchange assembly 6, the air resistance is increased at the position with large air inlet quantity at the middle part of the finned tube heat exchange assembly 6 through the overlapped supporting plate 601 and the L-shaped finned tube 602 so as to realize the effect of uniform air inlet quantity, meanwhile, the pressure difference between the two adjacent second serial connection tubes 604 is matched to be the same, so that the refrigerant flow quantity passing through the second serial connection tubes 604 is the same, the frost formation on the surface of the L-shaped finned tube 602 is more uniform, the space utilization rate of the L-shaped finned tube 602 which is staggered is increased, the contact area between the L-shaped finned tube 602 with the same air inlet area and the air is larger, the higher heat exchange efficiency is realized, meanwhile, the resistance of the L-shaped finned tube 602 which is obliquely arranged to the air is relatively larger, the middle cross heat exchange part 607 has larger air resistance, so as to adjust the air inlet quantity of the heat exchange part 606 and the cross heat exchange part 607 to be uniform, the difference of frost formation between the heat exchange part 606 and the cross heat exchange part 607 at the end is reduced, meanwhile, the occurrence of air vortex of the end heat exchanging part 606 is reduced, so that the frost formation of the end heat exchanging part 606 is prevented from becoming thicker due to the air vortex.
As shown in fig. 2 and 8, the heat exchange assembly 8 includes two connecting pipes 801, two connecting pipes 801 are provided, two connecting pipes 801 are respectively located at the front left corner and the rear right corner of the lower side of the heat pump housing 1, one end of each connecting pipe 801 is respectively communicated with the adjacent second serial connection pipe 604, the other end of each connecting pipe 801 is respectively communicated with a four-way valve 802, two gas-liquid separators 803, two compressors 804 and two condensers 805 are respectively provided and are circumferentially symmetrical, the adjacent gas-liquid separators 803 are communicated with the compressors 804, the adjacent compressors 804 are communicated with the condensers 805, the four-way valves 802 are respectively communicated with the adjacent gas-liquid separators 803, the compressors 804 and the condensers 805, the four-way valves 802 are used for changing the flow passages among the gas-liquid separators 803, the condensers 805 and the connecting pipes 801 to change the flow direction of the refrigerant in the L-shaped finned tubes 602, two water tubes 806 are provided between the two condensers 805 and the external water tank, one water pipe 806 is used for water inlet, and the other water pipe 806 is used for water outlet, so that two condensers 805 are communicated with the circulation of external circulating water.
In a normal heat-taking state, refrigerant passing through the L-shaped finned tube 602 is converted into a state through the gas-liquid separator 803 and the compressor 804 by the serial connection of the heat exchange assembly 8, and heat absorbed by the refrigerant is transferred to circulating water in the condenser 805, so that the purpose of heating the circulating water is achieved, in a defrosting state, the direction of the circulating water in the condenser 805 is changed, the circulation state of the refrigerant in the L-shaped finned tube 602 is changed through the four-way valve 802, so that the refrigerant originally absorbs heat in the L-shaped finned tube 602, the refrigerant state is switched to release heat in the L-shaped finned tube 602, when the refrigerant releases heat, the heat is transferred through the L-shaped finned tube 602 to remove frost condensed at the upper part of the refrigerant, the frost thickness of frost at different positions at the upper part of the refrigerant is uniform as much as possible through the uneven arrangement of the L-shaped finned tube 602, and therefore, the frost on the L-shaped finned tube 602 is uniformly removed through a certain defrosting time in the defrosting process, excessive heat is prevented from being wasted by the circulating water, and the flow direction of the refrigerant in the L-shaped finned tube 602 is changed by the four-way valve 802 after defrosting is completed, and the flow direction of the circulating water in the reduction condenser 805 is changed.
Example 3
On the basis of the embodiment 2, as shown in fig. 2 and fig. 3, the device further comprises a state switching assembly 7, the state switching assembly 7 is fixedly installed on the fixing frame 3, the state switching assembly 7 is used for switching the state of the finned tube heat exchange assembly 6 according to the external temperature, so that the finned tube heat exchange assembly 6 is matched with the use under different environments to achieve the purpose of uniform frosting, the maximum heat exchange effect is achieved under the non-frosting state, the state switching assembly 7 is fixedly connected with the finned tube heat exchange assembly 6, the state switching assembly 7 comprises electric hydraulic push rods 701, the electric hydraulic push rods 701 are provided with four, the four electric hydraulic push rods 701 are respectively and fixedly installed on the fixing frame 3, the telescopic ends of the two left electric hydraulic push rods 701 are respectively and fixedly installed with a first connecting plate 702, the telescopic ends of the two right electric hydraulic push rods 701 are respectively and fixedly installed with a second connecting plate 703, the first connecting plate 702 and the second connecting plate 703 are fixedly connected with the adjacent fixing plates 605 through bolts respectively, the upper ends of the upper three groups of supporting plates 601 are welded with baffle plates 704, the lower ends of the lower three groups of supporting plates 601 are welded with baffle plates 704, the baffle plates 704 penetrate through the heat pump shell 1 and are connected with the heat pump shell in a sliding manner, the baffle plates 704 are used for guiding the finned tube heat exchange assembly 6 during movement, meanwhile, the isolation to external rainwater or other humid environments is achieved, the inner side surfaces of the baffles 704 are respectively welded with the fixed rods 705, racks are respectively welded on two sides of the fixed rods 705, two rack racks 706 are respectively welded on the upper side of each fixed plate 605, the front side surface, the rear side surface and the right side surface of the fixed frame 3 are respectively connected with a straight gear 707 in a rotating mode through rotating shafts, the straight gear 707 is respectively meshed with the adjacent fixed rods 705 and the rack racks 706, the adjacent fixed rod 705 and rack 706 are moved toward or away from each other by a spur gear 707.
Because the climate conditions of different regions are different, different temperature conditions and wind direction and wind speed conditions can be changed, and the climate change in four seasons is relatively large, the frost thickness of different positions on the L-shaped finned tube 602 can be changed, therefore, the height of the cross heat exchange portion 607 needs to be adjusted, the air intake through the L-shaped finned tube 602 is adjusted, and the air flow field state of the heat exchange portion 606 at the end is changed, so as to adjust the frost thickness of the L-shaped finned tube 602, when the air is dry, the electric hydraulic push rod 701 drives the fixed plate 605 to move downwards through the first connecting plate 702 and the second connecting plate 703, the fixed plate 605 drives the lower three groups of L-shaped finned tubes 602 and the rack frame 706 to move downwards, the rack frame 706 drives the adjacent fixed rod 705 to move upwards through the straight gear 707, so as to drive the upper three groups of L-shaped finned tubes 602 to move upwards through the baffle plate 704, three groups of L-shaped finned tubes 602 on the upper side and the lower side are opened in a crossed mode, the contact area between the L-shaped finned tubes 602 and air is relatively increased, so that the heat exchange effect between the L-shaped finned tubes 602 and the air is enhanced, the lower three groups of L-shaped finned tubes 602 are driven to move upwards through the electric hydraulic push rod 701 under the environment with large external wind sand or when the humidity in the air is high, the upper three groups of L-shaped finned tubes 602 move downwards, the height of the cross heat exchange portion 607 is increased, the contact area between the L-shaped finned tubes 602 and the air is reduced, and the phenomenon that the frosting is too thick due to the air eddy of the end heat exchange portion 606 is prevented.
In the defrosting process, the L-shaped finned tubes 602 on the upper side and the lower side are completely overlapped through the electric hydraulic push rod 701, so that in the heat-releasing defrosting process of the L-shaped finned tubes 602, the resistance to air is increased by the L-shaped finned tubes 602 on the upper side and the lower side, the heat dissipation speed between two adjacent groups of L-shaped finned tubes 602 is reduced, the defrosting process of the L-shaped finned tubes 602 is further accelerated, and after defrosting is finished, the L-shaped finned tubes 602 are reset to the working state through the electric hydraulic push rod 701.
Example 4
On the basis of the embodiments 1-3, the method for non-uniform arrangement of the L-shaped finned tube heat exchanger of the air source heat pump comprises the following steps:
s1: under the fixing action of the state switching assembly 7, the non-uniform arrangement of the finned tube heat exchange assembly 6 is completed, then the fan 5 and the heat exchange assembly 8 are fixedly installed in the heat pump shell 1, then the finned tube heat exchange assembly 6 and the heat exchange assembly 8 are communicated with each other and circulate refrigerant, and finally the heat exchange assembly 8 and an external water tank are communicated with circulating water;
s2: when the air heat source pump is started to heat circulating water in the water tank, the heat exchange assembly 8 is started at first, refrigerant starts to circulate in the finned tube heat exchange assembly 6 and the heat exchange assembly 8, the fan 5 is started at the same time, the fan 5 drives air to circumferentially enter the heat pump shell 1 and then to be discharged outwards, in the process, the air exchanges heat with the finned tube heat exchange assembly 6, and heat is transferred through the refrigerant to heat the circulating water circulating in the heat exchange assembly 8;
s3: when defrosting is performed, the fan 5 is turned off, external circulating water flows reversely, refrigerant in the finned tube heat exchange assembly 6 flows reversely through the heat exchange assembly 8, frosting on the surface of the finned tube heat exchange assembly 6 is removed through heat of the circulating water, the flowing directions of the refrigerant in the finned tube heat exchange assembly 6 and the circulating water in the heat exchange assembly 8 are recovered after defrosting is completed, and the fan 5 is restarted to operate;
s4: in order to match with the climate environment of each region, the non-uniform arrangement state of the finned tube heat exchange assembly 6 is selected through the state switching assembly 7, so that the effect of uniform frosting is achieved, and meanwhile, the state switching assembly 7 is matched with the state change of the finned tube heat exchange assembly 6 in the defrosting process, so that the influence of the air volume and the external temperature is reduced.
While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.
Claims (10)
1. A non-uniform arrangement structure of an L-shaped finned tube heat exchanger of an air source heat pump is characterized by comprising a heat pump shell (1), wherein four through holes are formed in the circumferential direction of the heat pump shell (1), a sealing cover (2) is fixedly arranged on the left side face of the heat pump shell (1), a fixing frame (3) is arranged in the heat pump shell (1), the fixing frame (3) is fixedly connected with the upper surface of the heat pump shell (1), a fan (5) is fixedly arranged in the fixing frame (3), the fan (5) penetrates through the upper side face of the heat pump shell (1) to be communicated with the outside, a finned tube heat exchange assembly (6) is arranged in the heat pump shell (1), the finned tube heat exchange assembly (6) is used for heat exchange between a refrigerant and outside air, a heat exchange assembly (8) is arranged on the inner bottom face of the heat pump shell (1), the finned tube heat exchange assembly (6) is communicated with the heat exchange assembly (8), and the refrigerant circulates in the finned tube heat exchange assembly (8), the circulating water circulates in the heat exchange assembly (8), the supporting block (9) is fixedly connected to the left portion in the heat pump shell (1), the heat exchange assembly (8) is used for exchanging heat between the circulating water in the heat exchange assembly and the refrigerant, the refrigerant exchanges heat with the outside air under the action of the finned tube heat exchange assembly (6), the finned tube heat exchange assembly (6) is matched with the heat exchange assembly (8), and the heat is exchanged for water flowing through the heat exchange assembly (8).
2. The non-uniform arrangement structure of the L-shaped finned tube heat exchanger of the air source heat pump as claimed in claim 1, characterized in that the front side surface, the rear side surface and the right side surface of the heat pump shell (1) are respectively provided with an air inlet mesh grid (4), and the air inlet mesh grids (4) are used for protecting and preventing dust of parts in the heat pump shell (1).
3. The non-uniform arrangement structure of the L-shaped finned tube heat exchanger of the air source heat pump as claimed in claim 1, wherein the bottom of the heat pump shell (1) is circumferentially provided with drain holes (10), and the drain holes (10) are used for draining the melted water in the heat pump shell (1).
4. The non-uniform arrangement structure of the L-shaped finned tube exchanger of the air source heat pump according to claim 1, characterized in that the finned tube heat exchange assembly (6) comprises support plates (601), six groups of the support plates (601) are arranged, a plurality of the support plates (601) are respectively arranged on each group of the support plates, a plurality of the support plates (601) are respectively arranged in the heat pump shell (1) in a sliding manner, two adjacent support plates (601) between two adjacent groups are staggered and connected in a sliding manner, a plurality of L-shaped finned tubes (602) are fixedly connected between each group of the support plates (601), two ends of the upper three groups of L-shaped finned tubes (602) are fixedly installed and communicated with a first serial connection tube (603), two ends of the two groups of L-shaped finned tubes (602) on the front side and the rear side are fixedly installed and communicated with a second serial connection tube (604), two ends of the group of L-shaped finned tubes (602) on the right side are respectively communicated with the adjacent second serial connection tubes (604), the adjacent first serial connection pipe (603) and the second serial connection pipe (604) are communicated through a high-pressure hose, and the upper ends of the three groups of L-shaped finned tubes (602) on the lower side are fixedly connected with fixing plates (605).
5. The uneven layout structure of the L-shaped finned tube heat exchanger of the air source heat pump as claimed in claim 4, wherein two adjacent L-shaped finned tubes (602) are staggered, and the L-shaped finned tubes (602) are cylindrical, so that the matching has higher space utilization rate.
6. The uneven layout structure of the L-shaped finned tube exchanger of the air source heat pump as claimed in claim 4, wherein the position where the adjacent two support plates (601) do not cross is an end heat exchanging part (606), the position where the adjacent two support plates (601) cross is a cross heat exchanging part (607), the distance from the upper end to the lower end of the adjacent two support plates (601) is H, then the cross heat exchanging part (607) occupies 1/3-9/10H, and the end heat exchanging part (606) occupies 1/20-1/3H.
7. The non-uniform arrangement structure of the L-type finned tube exchanger of the air-source heat pump as recited in claim 4, characterized in that the absolute values of the working pressure differences between two adjacent second series pipes (604) are the same.
8. The non-uniform arrangement structure of the L-shaped finned tube heat exchanger of the air source heat pump as claimed in claim 4, wherein the heat exchange assembly (8) comprises two connecting tubes (801), the two connecting tubes (801) are respectively located at the front left corner and the rear right corner of the heat pump shell (1), one end of each connecting tube (801) is respectively communicated with the adjacent second serial connecting tube (604), the other end of each connecting tube (801) is respectively communicated with a four-way valve (802), the two gas-liquid separators (803), the two compressors (804) and the two condensers (805) are respectively provided with two and are circumferentially symmetrical, the adjacent gas-liquid separators (803) are communicated with the compressors (804), the adjacent compressors (804) are communicated with the condensers (805), and the four-way valves (802) are respectively communicated with the adjacent gas-liquid separators (803), the compressors (804) and the condensers (805), two water pipes (806) are arranged between the two condensers (805) and the external water tank, one water pipe (806) is used for water inlet, and the other water pipe (806) is used for water outlet.
9. The non-uniform arrangement structure of the L-shaped finned tube heat exchanger of the air source heat pump as claimed in claim 8, characterized by further comprising a state switching assembly (7), wherein the state switching assembly (7) is arranged on the fixed frame (3), the state switching assembly (7) is used for switching the state of the finned tube heat exchange assembly (6) according to the external temperature, the state switching assembly (7) is fixedly connected with the finned tube heat exchange assembly (6), the state switching assembly (7) comprises electric hydraulic push rods (701), the electric hydraulic push rods (701) are provided with four, the four electric hydraulic push rods (701) are respectively fixedly connected with the fixed frame (3), the telescopic ends of the two left electric hydraulic push rods (701) are respectively fixedly connected with a first connecting plate (702), the telescopic ends of the two right electric hydraulic push rods (701) are respectively fixedly connected with a second connecting plate (703), first connecting plate (702) and second connecting plate (703) respectively with adjacent fixed plate (605) rigid coupling, equal rigid coupling in backup pad (601) upper end of three groups of upside has baffle (704), equal rigid coupling in backup pad (601) lower extreme of three groups of downside has baffle (704), baffle (704) pass heat pump casing (1) and rather than sliding connection, the medial surface of baffle (704) rigid coupling respectively has dead lever (705), the both sides of dead lever (705) are provided with the rack respectively, equal rigid coupling has two rack (706) on every fixed plate (605) upside, the front and back both sides face and the right flank of mount (3) are connected with straight-teeth gear (707) through the pivot rotation respectively, straight-teeth gear (707) mesh with adjacent dead lever (705) and rack (706) respectively.
10. A method of non-uniform layout of an L-finned tube heat exchanger of an air-source heat pump as claimed in any one of claims 1 to 9, comprising the steps of:
s1: under the fixing action of the state switching assembly (7), the non-uniform arrangement of the finned tube heat exchange assembly (6) is completed, then the fan (5) and the heat exchange assembly (8) are fixedly installed in the heat pump shell (1), then the finned tube heat exchange assembly (6) is communicated with the heat exchange assembly (8) and a refrigerant flows through the finned tube heat exchange assembly, and finally the heat exchange assembly (8) is communicated with an external water tank to form circulating water;
s2: when an air heat source pump is started to heat circulating water in a water tank, firstly, a heat exchange assembly (8) is started, a refrigerant starts to circulate in a finned tube heat exchange assembly (6) and the heat exchange assembly (8), and meanwhile, a fan (5) is started, the fan (5) drives air to circumferentially enter a heat pump shell (1) and then to be discharged outwards, the air exchanges heat with the finned tube heat exchange assembly (6) in the process, and heat is transferred through the refrigerant to heat the circulating water circulating in the heat exchange assembly (8);
s3: when defrosting is carried out, the fan (5) is turned off, external circulating water reversely flows, refrigerant in the finned tube heat exchange assembly (6) reversely flows through the heat exchange assembly (8), frosting on the surface of the finned tube heat exchange assembly (6) is removed through heat of the circulating water, the flowing direction of the refrigerant of the finned tube heat exchange assembly (6) and the circulating water in the heat exchange assembly (8) is recovered after defrosting is finished, and the fan (5) is restarted to work;
s4: in order to match with the climate environment of each region, the non-uniform arrangement state of the finned tube heat exchange assemblies (6) is selected through the state switching assemblies (7), so that the effect of uniform frosting is achieved, and meanwhile, the state switching assemblies (7) are matched with the state change of the finned tube heat exchange assemblies (6) in the defrosting process, and the influence of air volume and outside temperature on the finned tube heat exchange assemblies is reduced.
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| CN115127257B (en) | 2023-07-25 |
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