CN113977213A - Preparation method of heat exchanger for microtube air conditioner - Google Patents
Preparation method of heat exchanger for microtube air conditioner Download PDFInfo
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- CN113977213A CN113977213A CN202110167402.0A CN202110167402A CN113977213A CN 113977213 A CN113977213 A CN 113977213A CN 202110167402 A CN202110167402 A CN 202110167402A CN 113977213 A CN113977213 A CN 113977213A
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- 238000002360 preparation method Methods 0.000 title abstract description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 83
- 229910052802 copper Inorganic materials 0.000 claims abstract description 83
- 239000010949 copper Substances 0.000 claims abstract description 83
- 239000007788 liquid Substances 0.000 claims abstract description 36
- 238000003466 welding Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000004381 surface treatment Methods 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims abstract description 3
- 239000003973 paint Substances 0.000 claims abstract description 3
- 230000035515 penetration Effects 0.000 claims abstract description 3
- 238000005507 spraying Methods 0.000 claims abstract description 3
- 238000004519 manufacturing process Methods 0.000 claims description 16
- 238000004080 punching Methods 0.000 claims description 16
- 238000005520 cutting process Methods 0.000 claims description 12
- 239000000047 product Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000005498 polishing Methods 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- RIRXDDRGHVUXNJ-UHFFFAOYSA-N [Cu].[P] Chemical compound [Cu].[P] RIRXDDRGHVUXNJ-UHFFFAOYSA-N 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 239000011265 semifinished product Substances 0.000 claims description 3
- 238000004513 sizing Methods 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 10
- 239000000463 material Substances 0.000 abstract description 6
- 239000003507 refrigerant Substances 0.000 description 22
- 238000013461 design Methods 0.000 description 17
- 238000012546 transfer Methods 0.000 description 8
- 238000005057 refrigeration Methods 0.000 description 7
- 238000004378 air conditioning Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
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- 238000005406 washing Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
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- 239000012071 phase Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 239000007791 liquid phase Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
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- 230000003287 optical effect Effects 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/26—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass heat exchangers or the like
Abstract
The invention provides a preparation method of a heat exchanger for a microtube air conditioner, which comprises the following steps: the first step is as follows: preparing a radiating fin; secondly, preparing a copper pipe; step three, preparing an elbow; fourthly, preparing a liquid collector; fifthly, pipe penetration; sixthly, expanding the tube; step seven, welding; eighth, cleaning the surface; ninth, leak detection is carried out; tenth, drying; step ten, correcting the shape; and a twelfth step of performing surface treatment and paint spraying as required. The heat exchanger prepared by the method has compact volume, low material consumption and excellent heat exchange effect.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a preparation method of a micro-fine tube heat exchanger used for a household air conditioner outdoor unit.
Background
The heat exchangers applied to refrigeration and air-conditioning products have many types, including fin tube heat exchangers, plate heat exchangers, microchannel heat exchangers and the like, and the fin tube heat exchangers are the most widely applied heat exchanger types at present, wherein the tubes are copper tubes, and the fins are aluminum sheets. The evaporator and condenser of a household air conditioner basically adopt fin-tube heat exchangers, and the yield of the heat exchangers reaches hundreds of millions of sets every year.
The finned tube heat exchanger is one of the key parts of the air conditioner, and directly influences the performance and the cost of the air conditioner. With the increasing energy efficiency upgrading and cost competition of air conditioners, the development of high-efficiency low-cost heat exchangers is generally concerned in the industry, wherein the small-caliber finned tube heat exchanger becomes one of the research hotspots in recent years. The diameter of a copper pipe of a traditional fin pipe type heat exchanger is generally larger than 6mm and belongs to a large-scale channel, while the diameter of the copper pipe of a small-caliber heat exchanger is between a micro channel and the large-scale channel and belongs to a compact channel. The small-caliber heat exchanger has higher heat exchange coefficient and lower manufacturing cost, and is beneficial to improving the overall performance of the air conditioner. In recent years, research on the aspects of optimized design, manufacturing process, practical application and the like of small-caliber heat exchangers is greatly advanced, so that small-caliber air conditioners occupy more than 20% of the air conditioner market.
The inventor has earlier applied for the relevant patent of small pipe diameter heat exchanger, and the pipeline design scheme of adoption is for adopting 5 branch road designs, and 40 copper pipes of arranging in parallel of each branch road, and the structure is complicated, and the radiating effect is difficult to reach the optimum, and refrigeration effect is not as good as traditional idle call heat exchanger.
The related patents are as follows: 201720297795.6A heat exchanger with multi-channel parallel flow dividing
202010015725.3 flow guide pipe and fin assembling structure of fin type heat exchanger using fine flow guide pipe
Technical scheme
In order to solve the technical problems, the invention provides a heat exchanger for an air conditioner with a 4mm microtube and a brand new pipeline design, and an air conditioner outdoor unit using the heat exchanger, wherein the heat exchanger has a better heat exchange effect than a traditional heat exchanger for the air conditioner, and is compact in size and low in material consumption.
Based on the above, the invention also provides a preparation method of the heat exchanger for the air conditioner with the microtubes, wherein the prepared heat exchanger comprises a plurality of pipeline branches, radiating fins and a liquid collector, the pipeline branches of the copper pipes are connected in parallel, the inlet of each branch copper pipe is connected to one liquid collector for confluence, the outlet of each branch copper pipe is connected to the other liquid collector for confluence, the liquid collectors are connected with the pipeline of the external air conditioning system, the radiating fins are vertically pressed on the copper pipes in parallel by utilizing copper pipe mounting holes arranged on the surface, the diameter of the copper pipes is less than or equal to 4mm, and one branch pipeline comprises more than two U-shaped copper pipes and a plurality of C-shaped elbows;
the steps of the method specifically include that,
the first step is as follows: preparing a radiating fin;
secondly, preparing a copper pipe;
step three, preparing an elbow;
fourthly, preparing a liquid collector;
fifthly, pipe penetration;
sixthly, expanding the tube;
step seven, welding;
eighth, cleaning the surface;
ninth, leak detection is carried out;
tenth, drying;
step ten, correcting the shape;
and a twelfth step of performing surface treatment and paint spraying as required.
The first further comprises:
1. punching for one time, punching by a punching die, and punching a turbulence wafer on an aluminum sheet to form a semi-finished hole with the aperture of 3 mm;
2. secondary stamping, namely stamping the hole position of the finished product of the radiating fin, and expanding the hole of the semi-finished product in the first step to 4.1 mm;
3. and cutting to obtain the radiating fin.
And the second step is further to carry out straightening, sizing, cutting and blanking on the copper pipe through a coil pipe straightening and cutting machine to obtain a straight copper pipe.
And the third step is further to utilize the pipe bender to complete the manufacture of C-shaped and U-shaped elbows.
And the fourth step is that the red copper coil stock is subjected to blanking, heat treatment, punch forming, edge cutting, positioning punching, polishing correction and deburring to complete the manufacture of the liquid collector.
The fifth step is that the radiating fins are sequentially arranged and aligned according to a certain direction, and the copper pipe penetrates through a finished hole position to complete the pipe penetrating work of the fin;
and the sixth step is specifically to complete the expansion connection work of the internal thread straight pipe through a pipe expander, and the expansion is achieved by means of the elastic-plastic deformation of the copper pipe and the fins, so that the combination part of the copper pipe and the radiating fin is perfectly attached.
And the seventh step is to weld the C-shaped elbow, the U-shaped elbow and the liquid collector to the copper pipe after the expansion by using a phosphor copper welding rod to complete the whole assembly process.
Advantageous effects
By adopting the 4mm micro-fine pipe diameter heat exchanger provided by the invention, under the condition that the energy efficiency of a cooling mode is close, the scheme can save copper by 15.4% at most compared with the traditional phi 7mm or phi 9mm heat exchanger of the current household air conditioner, and the energy efficiency of a heating mode is obviously superior to that of the traditional size heat exchanger. Meanwhile, compared with the refrigerant charging amount in the heat exchanger with the traditional size at the outdoor side, the refrigerant charging amount is only about 80% -90% of the original value, and the refrigerant charging method has great advantages in cost. By optimizing the thermal resistance of the refrigerant side, the purposes of compact volume, low material consumption and excellent heat exchange effect of the heat exchanger are achieved.
Drawings
FIG. 1 is a schematic view of the overall construction of a heat exchanger according to the present invention;
FIG. 2 is a left side view of the heat exchanger of the present invention;
FIG. 3 is a right side view of the heat exchanger of the present invention;
FIG. 4 is a schematic three-dimensional structure of a single copper tube of 6 copper tubes in a heat exchanger;
FIG. 5 is a diagram of a practical product of the heat exchanger of the present invention;
FIG. 6 is a schematic diagram of a three-dimensional structure of a single-hanging copper tube with 9 branches and 8 copper tubes;
FIG. 7 is a front view of a centralized liquid diversion accumulator in the heat exchanger;
FIG. 8 is a left side view of a single tube three-dimensional configuration of the early heat exchanger;
FIG. 9 is a right side view of the single tube three dimensional configuration of the early heat exchanger;
fig. 10 is a schematic diagram of a single-pipeline three-dimensional structure of a 24-row 2-column heat exchanger of a hel 1.5 matched-frequency air conditioner external unit heat exchange structure;
fig. 11 is a schematic structural view of an external unit of an air conditioner according to the present invention.
Detailed Description
The small-pipe-diameter heat exchanger is used for replacing a heat exchanger in a traditional household air conditioner on the premise of consuming less copper materials, and considering the size problem of the traditional household air conditioner heat exchanger, the length of the small-pipe-diameter heat exchanger needs to be smaller than 600mm, the thickness of the small-pipe-diameter heat exchanger needs to be smaller than 40mm, and the height of the small-pipe-diameter heat exchanger is smaller than 500 mm.
Air side pressure drop is a problem that must be faced in considering heat exchanger applications. Air side pressure drop and tube row under the unchangeable condition of heat transfer house steward length, the row number increase can lead to the windward area to reduce air flow rate, increase air side pressure drop. In fact, the heat exchange capacity of the air side of the heat exchanger is the result of the combined action of the air quantity and the heat exchange coefficient (related to the air speed and the pressure drop).
The bottleneck in improving the performance of the small-diameter heat exchanger is mainly that the thermal resistance on the refrigerant side is difficult to effectively reduce. The following schemes are adopted for reducing the thermal resistance of the refrigerant side, 1) an internal threaded pipe is used for replacing a light pipe, the heat exchange coefficient of the refrigerant side is increased, and the side effect is that the pressure drop is possibly overlarge; 2) the number of branches is reduced, thereby increasing the refrigerant side heat transfer coefficient, with the side effect that the pressure drop may be excessive.
The heat exchange area of the refrigerant side of the small-diameter heat exchanger is less, and the heat exchange coefficient of the refrigerant side is increased by reducing the number of branches, so that the thermal resistance of the refrigerant side is reduced.
Based on the above, the invention provides a micro-fine tube heat exchanger, which comprises a plurality of tube branches, cooling fins and a liquid collector, wherein the plurality of tube branches are formed by a plurality of copper tubes, the number of the copper tube branches is preferably 8-16, more preferably 10-12, and most preferably 12, the copper tube branches are connected in parallel in a parallel manner, the inlet of each copper tube branch is connected to one liquid collector confluence, the outlet of each copper tube branch is connected to the other liquid collector confluence, the liquid collectors are connected with external air conditioning system tubes, and the cooling fins are vertically pressed on the copper tubes in parallel by using copper tube mounting holes arranged on the surface.
The branch pipeline comprises more than two U-shaped pipelines and a plurality of C-shaped elbows, and the C-shaped elbows are used for communicating the end parts of the two U-shaped copper pipes to form a passage.
Further preferably, one pipeline is composed of 2C-shaped elbows and 3U-shaped copper pipes.
Each U-shaped copper pipe is connected in parallel.
The length of each copper tube is preferably 500mm to 600mm, more preferably 530mm to 580 mm.
The copper pipe preferably adopts an internal thread pipe, compared with a smooth copper pipe, the internal thread pipe is adopted, the heat exchange area of the refrigerant flowing side is greatly improved, and due to the fact that the wall thickness of the internal thread pipe is small, under the same flow path design, the consumption of copper materials using the internal thread pipe is less. The outer diameter of the copper pipe is a micro-pipe with the diameter less than 4mm, and the wall thickness of the micro-pipe is less than 0.25mm, preferably 0.2 mm.
The height of the teeth of the internal thread tube is preferably 0.13-0.18mm, more preferably 0.16mm, the tooth crest angle is preferably 12-16 degrees, more preferably 14 degrees, the helix angle is preferably 15-20 degrees, more preferably 17 degrees, and the number of racks is preferably 30-50, more preferably 40.
The liquid collector is in a shower nozzle shape, liquid distributing holes with the aperture of 4mm are uniformly distributed on the circumference of the shower nozzle and are of equidistant liquid distributing structures, and the flow velocity and the flow of each copper pipe are equal.
The liquid collector can also be set to be in a copper tube shape, the tube diameter is preferably 6mm-8mm, round holes with the same number as that of parallel tubes are uniformly punched on the side wall of the tube, the aperture is preferably 4mm, the parallel copper tubes and the liquid collector are welded, and the length of a flow path of each tube is ensured to be consistent with the flow resistance.
The longitudinal distance between the centers of the parallel copper pipes in parallel is preferably 18mm-22mm, more preferably 20mm, and the transverse distance between the centers of the parallel copper pipes is preferably 10mm-15mm, more preferably 13 mm.
The pitch of the fins is preferably 1mm to 1.5mm, and more preferably 1.3 mm.
The radiating fin material selects an aluminum sheet with the thickness of 0.1mm, the length is preferably 480mm, and the width is preferably 39 mm.
If the turbulence wafers formed by stamping are arranged on the radiating fins, the diameter of each turbulence semicircle is 3.5mm, and the height of each turbulence is 1.3mm of the interval between the fins.
The invention also provides a preparation method of the heat exchanger, which comprises the following steps:
the first step is as follows: preparing a radiating fin:
1) punching for one time, punching by a punching die, and punching a turbulence wafer on an aluminum sheet to form a semi-finished hole with the aperture of 3 mm;
2) secondary punching, punching the hole position of the finished product of the radiating fin, expanding the hole of the semi-finished product of the first step to 4.1mm
3) And cutting for three times, and finishing blanking of the radiating fins.
The second step is that: preparing a copper pipe, and straightening, sizing, cutting and blanking the copper pipe through a coil pipe straightening cutting machine;
the third step: preparing an elbow, and finishing the manufacture of C-shaped and U-shaped elbows by using a pipe bender;
the fourth step: preparing a liquid collector, namely blanking, carrying out heat treatment on a red copper coil, carrying out punch forming, cutting edges, positioning and punching, polishing and correcting, and deburring to finish the manufacturing of the liquid collector;
the fifth step: the fins are arranged and aligned in sequence according to a certain direction, and the copper pipe penetrates through the hole site of the finished product to complete the fin tube penetrating work;
and a sixth step: expanding the pipe, namely finishing the expansion connection work of the internal thread straight pipe through a pipe expander, and achieving expansion by means of the elastic-plastic deformation of the copper pipe and the fins so that the combination part of the copper pipe and the radiating fins is perfectly attached;
the seventh step: welding, namely welding the C-shaped elbow, the U-shaped elbow and the liquid collector onto the copper pipe after the pipe expansion by using a phosphor copper welding rod to complete the whole assembly process;
eighth step: surface cleaning:
1) polishing, namely removing welding slag and welding beading by using a steel wire brush polishing machine and a fiber wheel polishing machine;
2) washing, namely washing with water to remove metal chips and attached particles;
3) degreasing, namely removing oil stains by using an ultrasonic cleaning machine;
4) descaling, acid washing, and passivating the descaling.
The ninth step: and (4) detecting leakage, namely filling 5-6Mpa compressed air into the heat exchanger, integrally placing the heat exchanger into a water pool, and keeping the pressure for a certain time (for example, 30s) until no bubble is generated, wherein no leakage point exists.
The tenth step: drying, namely removing surface moisture by using a centrifugal machine and a dryer;
the eleventh step: correcting the shape, and manually correcting by using bent and deformed fins of the forceps pair;
the twelfth step: surface treatment, painting (as required).
The present invention also provides a 1.5 p outdoor unit for an air conditioner, comprising: the heat exchanger provided above is composed of evaporator/condenser, compressor and electric control equipment, four-way valve, capillary tube, blower and casing, and the liquid collector of the heat exchanger is connected to the compressor through the four-way valve.
Embodiments of the present invention will be described in detail below with reference to examples and drawings, by which how to apply technical means to solve technical problems and achieve a technical effect can be fully understood and implemented.
Examples
As shown in fig. 1, the present invention provides a micro-fine tube heat exchanger, which includes a plurality of tube branches 1 formed by a plurality of copper tubes, a heat sink 2, and a liquid collector 5, wherein the plurality of tube branches are arranged in parallel, and the specific design manner is as follows. As shown in fig. 5, the inlets of all the branches are connected to one liquid collector confluence, the outlets of all the branches are connected to the other liquid collector confluence, the liquid collectors are connected with external air conditioning system pipelines, and the cooling fins are vertically pressed on copper pipes in parallel by using copper pipe mounting holes arranged on the surface.
The structure of the liquid collector is shown in figure 7, the liquid collector is in a shower head shape 11, liquid distribution holes 12 with the hole diameter of 4mm are uniformly distributed on the circumference of the shower head, and the liquid collector is in an equidistant liquid distribution structure, so that the flow velocity and the flow of each copper pipe are equal.
Effect test
Experimental equipment adopted
And testing the heat exchange capacity of the indoor unit and the outdoor unit by using an enthalpy difference chamber and adopting a refrigerant flow method.
And the performance of the copper threaded pipe heat exchangers with different pipeline designs is compared.
TABLE 1 basic dimensions of threaded copper tubes
The invention adopts two different pipeline designs, both of which adopt 24 rows and 3 rows, the left view of the heat exchanger based on the optimal proposal of the invention is shown in figure 2, the right view is shown in figure 3, 12 branches are adopted, each branch is 6 copper pipes, and the pipeline design is shown in figure 4 and consists of 2C-shaped elbows 3 and 3U-shaped copper pipes 4. The refrigerant flow direction is shown in fig. 4.
In comparison, the heat exchanger scheme of 9 branches and 8 copper pipes in each branch is also designed, as shown in fig. 6, except for the pipeline design, the scheme is completely the same as the optimal scheme of the application.
TABLE 2 two basic dimensional parameters of heat exchangers
TABLE 3 comparison of outside capacities of two heat exchangers for refrigeration operation
TABLE 4 comparison of the outside capacities of the two heat exchangers for heating the running room
As can be seen from the table above, 9 paths of fins are adopted, the pressure drop is large, 12 paths of fins are adopted, the pressure drop is small, the fin efficiencies of the two paths of fins are equivalent, and therefore 12 paths of designed internal threaded pipes are selected.
Performance comparison of copper light pipe and threaded pipe heat exchanger with same pipeline design
The same pipeline design with 12 paths is adopted for comparing the performance of the copper light pipe and the performance of the threaded pipe.
TABLE 5 comparison of two Heat exchanger parameters
| Copper light pipe | Threaded pipe | |
| Wall thickness (mm) | 0.5 | 0.2 |
| Pipe external diameter (mm) | 4.2 | 4.0 |
| Number of tubes discharged X tube array | 24×3 | 24×3 |
| Fin spacing (mm) | 1.3 | 1.3 |
| Tube length (mm) | 600 | 550 |
| Thickness of fin (mm) | 0.1 | 0.1 |
| Heat converter height (mm) | 504 | 480 |
| Pipe spacing (longitudinal) (mm) | 21 | 20 |
| Pipe spacing (horizontal) (mm) | 20 | 13 |
| Thickness of heat exchanger (mm) | 60 | 39 |
| Heat exchanger spreading width (mm) | 600 | 550 |
TABLE 6 comparison of outside capacities of two heat exchangers for refrigeration operation
TABLE 7 comparison of the outside capacities of the heating running chambers of the two heat exchangers
TABLE 8 analysis of thermal resistance of two heat exchangers under condensing conditions
| Name (R) | Unit of | Optical copper pipe | Internal threaded pipe |
| Refrigerant side heat transfer area | m2 | 0.434 | 0.473 |
| Gas phase heat transfer coefficient | W/m2K | 976.48 | 1181.56 |
| Coefficient of heat transfer between two phases | W/m2K | 2563.71 | 13281.25 |
| Coefficient of liquid phase heat transfer | W/m2K | 1116.37 | 1113.13 |
| Average heat transfer coefficient | W/m2K | 2161.14 | 7916.88 |
| Air side heat transfer coefficient | W/m2K | 49.69 | 73.11 |
| Air side pressure drop | Pa | 11.52 | 13.98 |
| Area of primary heat exchange | m2 | 0.529 | 1.033 |
| Area of secondary heat exchange | m2 | 24.97 | 13.86 |
| Fin efficiency | - | 0.766 | 0.823 |
| Air side thermal resistance | K/W | 0.001030 | 0.001159 |
| Thermal conductive resistance | K/W | 2.878E-06 | 2.644E-06 |
| Refrigerant side thermal resistance | K/W | 0.001065 | 0.000267 |
| Total thermal resistance | K/W | 0.002098 | 0.001429 |
As can be seen from the above table, compared to the plain copper tube, the heat exchanger using the copper tube with internal threads has greatly improved heat exchange coefficient on the refrigerant side and heat exchange area on the refrigerant side. In addition, because the wall thickness of the internal thread pipe is small, under the same flow path design, the copper consumption of the internal thread pipe is only 1.07kg, and is reduced by more than 50% compared with the copper consumption of a smooth copper pipe which is 2.13. And the fin width using internally threaded tubes can be shortened to 39mm, reducing consumption by nearly half compared to previous designs. Therefore, the heat exchanger adopting the internal thread pipe has high performance upper limit and design allowance.
Comparative example 1
As shown in fig. 10, the hail 1.5 fixed-frequency air conditioner external unit heat exchange structure 24 is in a 2-row structure, the heating exchanger is arranged by 2 branches, and each branch comprises 24 copper pipes arranged in parallel.
Comparative example 2
The applicant's early 4mm diameter piping design, which uses a 5-branch design with 40 copper pipes arranged in parallel per branch, as shown in fig. 8 and 9.
TABLE 9 comparison of three Heat exchanger dimensional parameters
TABLE 9 comparison of dimensional parameters for three heat exchangers
The refrigeration performance of the three heat exchangers was compared on the premise that the R410A charges were all 1000 g.
TABLE 10 comparison of refrigeration performance of three heat exchangers
And (4) adopting different amounts of refrigerant R410A for comparison of condensation conditions.
TABLE 11 comparison of condensing conditions for different charge heat exchangers
Note: mass flow rate: mass of refrigerant passing per unit area per unit time
High pressure/low pressure: testing at each pressure point at inlet and outlet of heat exchanger
As can be seen from tables 10 and 11, the same refrigerant and compressor conditions were compared: under the rated refrigeration working condition, the COP of the system using the heat exchanger (2.94) and the heat exchanger (2.93) of the Hello prototype is approximate, and the heat exchange quantity and the average power of the evaporator are approximate to the average power of the Hello prototype. On the premise of meeting the heat exchange quantity of the indoor unit, the air conditioning system of the heat exchanger needs lower refrigerant charge quantity.
As shown in fig. 11, the present invention also provides a 1.5 p outdoor unit for an air conditioner, including: the 12-branch heat exchanger provided above is composed of an evaporator/condenser 6, a compressor 7, an electric control device, a four-way valve 8, a capillary tube, a blower 9 and a housing 10, and the liquid collector of the heat exchanger is connected to the compressor through the four-way valve.
All of the above mentioned intellectual property rights are not intended to be restrictive to other forms of implementing the new and/or new products. Those skilled in the art will take advantage of this important information, and the foregoing will be modified to achieve similar performance. However, all modifications or alterations are based on the new products of the invention and belong to the reserved rights.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (8)
1. A method for manufacturing a heat exchanger for an air conditioner with a microtube, characterized by comprising: the prepared heat exchanger comprises a plurality of pipeline branches, a cooling fin and a liquid collector, wherein the pipeline branches are formed by a plurality of copper pipes, and one branch pipeline comprises two U-shaped copper pipes and a C-shaped elbow;
the steps of the method specifically include that,
the first step is as follows: preparing a radiating fin;
secondly, preparing a copper pipe;
step three, preparing an elbow;
fourthly, preparing a liquid collector;
fifthly, pipe penetration;
sixthly, expanding the tube;
step seven, welding;
eighth, cleaning the surface;
ninth, leak detection is carried out;
tenth, drying;
step ten, correcting the shape;
and a twelfth step of performing surface treatment and paint spraying as required.
2. A method for producing a heat exchanger for a micro-tube air conditioner according to claim 1, comprising: the first further comprises:
firstly, punching at one time, punching a turbulence wafer on an aluminum sheet through a punching die to form a semi-finished hole with the aperture of 3 mm;
secondly, secondary stamping, namely stamping the hole position of the finished product of the radiating fin, and expanding the hole of the semi-finished product in the first step to 4.1 mm;
and thirdly, cutting to obtain the radiating fin.
3. A method for producing a heat exchanger for a micro-tube air conditioner according to claim 1, comprising: and the second step is further to carry out straightening, sizing, cutting and blanking on the copper pipe through a coil pipe straightening and cutting machine to obtain a straight copper pipe.
4. A method for producing a heat exchanger for a micro-tube air conditioner according to claim 1, comprising: and the third step is further to utilize the pipe bender to complete the manufacture of C-shaped and U-shaped elbows.
5. A method for producing a heat exchanger for a micro-tube air conditioner according to claim 1, comprising: and the fourth step is that the red copper coil stock is subjected to blanking, heat treatment, punch forming, edge cutting, positioning punching, polishing correction and deburring to complete the manufacture of the liquid collector.
6. A method for producing a heat exchanger for a micro-tube air conditioner according to claim 1, comprising: and the fifth step is that the radiating fins are sequentially arranged and aligned according to a certain direction, and the copper pipe penetrates through the finished hole position to finish the pipe penetrating work of the fin.
7. A method for producing a heat exchanger for a micro-tube air conditioner according to claim 1, comprising: and the sixth step is specifically to complete the expansion connection work of the internal thread straight pipe through a pipe expander, and the expansion is achieved by means of the elastic-plastic deformation of the copper pipe and the fins, so that the combination part of the copper pipe and the radiating fin is perfectly attached.
8. A method for producing a heat exchanger for a micro-tube air conditioner according to claim 1, comprising: and the seventh step is to weld the C-shaped elbow, the U-shaped elbow and the liquid collector to the copper pipe after the expansion by using a phosphor copper welding rod to complete the whole assembly process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN113977213B (en) | 2024-03-08 |
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