Heat exchanger for new-generation environment-friendly air conditioner

Abstract

A new-generation environment-friendly air conditioner heat exchanger comprises a heat exchange tube and fins, and the fins are arranged in the length direction of the heat exchange tube. The fins are provided with through holes and supporting wings, the heat exchange tubes penetrate through the through holes in the fins and are in interference fit with the through holes, the supporting wings are arranged on the front faces of the fins, and the supporting wing of the rear fin abuts against the back face of the front supporting wing. The outer diameter of each heat exchange pipe ranges from 3.8 mm to 4.3 mm, the heat exchange pipes are parallel to one another, a refrigerant flow path is formed after the heat exchange pipes are communicated, the refrigerant flow path is filled with refrigerants, and the weight ratio of the heat exchange pipes to the refrigerants ranges from 1.48 mm to 2.75. The pipe diameter of the heat exchange pipe of the heat exchanger is reduced, and due to the arrangement of the heat exchange pipe and the fins, compared with an existing air conditioner heat exchanger (the diameter of the heat exchange pipe is 5 mm) under the same power, the heat exchanger saves materials by more than 25.6%, and meanwhile the heat exchange energy efficiency ratio is increased by 0.15-0.42.

Description

Technical Field

[0001] The invention relates to a heat exchanger for air conditioning, in particular to a new generation of tube-fin heat exchanger for environmentally friendly air conditioning. Background Art

[0002] Heat exchangers are important components of refrigerators, air conditioners and other equipment, and are the most important factor affecting the energy efficiency and volume of the entire product. At present, the tube-fin heat exchangers used in air conditioners at home and abroad are mainly φ7mm in diameter. Some experts and companies have also developed φ5mm tube-fin heat exchangers and carried out trial production. Taking the φ5mm heat exchanger as an example, the weight of the heat exchanger of a single air conditioner is 3.5KG. Calculated based on the air conditioner production from January to November 2021, the copper consumption of the φ5mm heat exchanger is 69,104 tons. Affected by the epidemic, copper prices have been fluctuating and rising since March 2020, reaching a high of US$9,614.5 / ton, a 10-year high, and currently remain at a high of around US$9,000 / ton. Therefore, designing heat exchangers with lower cost and better heat exchange is an important issue facing the current refrigeration industry. Summary of the invention

[0004] The tube-fin heat exchanger includes a heat exchange tube and fins, and the fins are arranged along the length of the heat exchange tube; the fins have through holes and support wings, the heat exchange tube passes through the through holes on the fins and has an interference fit with the through holes, the support wings are arranged on the front of the fins, and the support wings of the rear fins are against the back of the front support wings. The tube-fin heat exchanger uses the cross-flow heat exchange between the cold and hot fluid walls, the refrigerant flows inside the tube, and the air flows outside the tube. The phase change heat transfer inside the tube is the main body, and the convection heat transfer outside the tube is the outside.

[0005] The object of the present invention is to provide a small-diameter tube-fin heat exchanger which can save copper and maintain heat exchange performance.

[0006] The new generation of environmentally friendly air conditioning heat exchanger includes heat exchange tubes and fins, and the fins are arranged along the length direction of the heat exchange tubes; the fins are provided with through holes and support wings, the heat exchange tubes pass through the through holes on the fins and are interference fit with the through holes, the support wings are arranged on the front of the fins, and the support wings of the rear fins are against the back of the support wings of the front fins; the outer diameter of the heat exchange tube is 3.8mm~4.3mm, there are multiple heat exchange tubes, the heat exchange tubes are parallel to each other, and the heat exchange tubes are connected to form a refrigerant flow path, and the refrigerant fills the refrigerant flow path. The weight ratio of the heat exchange tube and the refrigerant is: 1.48~2.75. The heat exchange tube diameter of the heat exchanger is reduced, and the configuration of the heat exchange tube and the fins makes the heat exchanger save more than 25.6% of materials compared with the existing air conditioning heat exchanger (heat exchange tube diameter 5mm) at the same power, and the heat exchange energy efficiency ratio is improved by 0.15~0.42.

[0007] Preferably, the weight ratio of the heat exchange tube to the refrigerant is 2.1-2.15. The heat exchange tube is made of copper tube or copper alloy tube, and the copper consumption of a single heat exchanger is saved as low as about 787g.

[0008] Furthermore, each through hole of the fin passes through the heat exchange tube, and the heat exchanger includes a plurality of heat exchange tubes, each of which includes two straight tube sections arranged in parallel and a curved tube section located between the straight tube sections, and the curved tube sections of all the heat exchange tubes are located on the same side of the heat exchanger, and the straight tube sections of the heat exchange tubes pass through the through holes of the fins, and there are gaps between adjacent fins, and the fins passing through the heat exchange tubes form a fin assembly; the weight ratio of the heat exchange tube to the fin assembly is: 0.56~1.03. The diameter of the heat exchange tube of the heat exchanger is reduced, and the configuration of the heat exchange tube and the fin makes the heat exchanger save about 42% of fin material compared with the existing air-conditioning heat exchanger (heat exchange tube diameter 5mm) at the same power.

[0009] Preferably, the weight ratio of the heat exchange tube to the fin assembly is 0.79-0.8. The fins are made of aluminum fins, and the minimum aluminum saving for a single heat exchanger is about 750g.

[0010] Furthermore, each fin has three dimensions: length, width and height. Among these three dimensions, the smallest dimension is used as thickness, the largest dimension is used as length, and the remaining third dimension is used as width. The projected area of ​​the fin is calculated by multiplying the length by the width. The ratio of the sum of the projected areas of all fins in the fin assembly to the weight of the refrigerant is: 0.065~0.071kg / m 3 Compared with the existing heat exchanger, the heat exchange efficiency ratio of this heat exchanger is improved by 0.15~0.42, and the heat exchanger capacity is increased by about 255w.

[0011] Furthermore, the hole wall of the through hole of the fin has an extension section extending outward, the extension section is cylindrical, the other end of the extension section has an outwardly expanded bell mouth, and the ratio of the height of the extension section to the width of the bell mouth is 10 to 16. Preferably, the ratio of the height of the extension section to the width of the bell mouth is 13.

[0012] In this way, the bell mouth can resist the previous (or next) fin when expanding the tube, so that the extension section of the current fin does not insert into the through hole of the previous (or next) fin. At the same time, the setting of the extension section and the bell mouth maintains the gap between two adjacent fins, thereby meeting the requirement of the ratio of the cumulative gap width between the fins to the total width of the fin assembly, improving the heat exchange performance and anti-clogging performance of the heat exchanger. The direction from the first fin to the last fin is the width direction of the heat exchanger. After the single fin forms the fin assembly, the fin is perpendicular to the width direction of the heat exchanger.

[0013] Furthermore, the straight tube sections of all the heat exchange tubes are parallel to each other, the center lines of the heat exchange tubes in the same row are located on the same plane, and there is at least one row of heat exchange tubes.

[0014] Furthermore, the curved pipe section is exposed from the fin assembly, and the two ends of the straight pipe section are also exposed from the fin assembly. Preferably, the ratio of the exposed width of the curved pipe section to the exposed width of the straight pipe section is 0.9 to 1.1. Optimally, the ratio of the exposed width of the curved pipe section to the exposed width of the straight pipe section is 1. Furthermore, all heat exchange tubes pass through the corresponding through holes on the fins, and the fins and heat exchange tubes are interference fit. Multiple heat exchange tubes arranged in parallel and with the central axis in the same plane are regarded as a group. The heat exchanger has at least one group of heat exchange tubes; the heat exchange tubes in the same group are arranged at equal intervals along the length of the fins. For a single cooling machine, one group of heat exchange tubes can complete the work. For a cooling and heating machine, two or more groups of heat exchange tubes may be required.

[0015] Furthermore, the heat exchanger has two straight plate portions and a transition portion connecting the two straight plate portions, and the transition portion is arc-shaped.

[0016] The advantages of the present invention are: based on the change of the size (inner diameter or outer diameter) of the heat exchange tube, compared with the Haier 5mm original machine test, under the same power, the COP coefficient is increased by 0.15, the volume is reduced by 10%, the weight is reduced by 25%, and the refrigerant is charged 21% less. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the present invention.

[0018] Figure 2 It is a perspective view of the present invention. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In some embodiments, a new generation of environmentally friendly air conditioning heat exchanger includes a heat exchange tube 1 and fins 2, wherein the fins 2 are arranged along the length direction of the heat exchange tube 1; the fins 2 are provided with through holes and support wings, the heat exchange tube 1 passes through the through holes on the fins 2 and is interference fit with the through holes, the support wings are arranged on the front of the fins 2, and the support wings of the rear fin 2 are against the back of the support wings of the front fin; the inner diameter of the heat exchange tube 1 is 3mm~4mm, there are multiple heat exchange tubes 1, the heat exchange tubes 1 are parallel to each other, and the heat exchange tubes 1 are connected to form a refrigerant flow path, the volume of the refrigerant flow path is used as the refrigerant filling volume, and the ratio of the refrigerant filling volume to the number of fins 2 is 2~3L / piece. The heat exchange tube 1 of the heat exchanger has a reduced diameter, and the configuration of the heat exchange tube 1 and the fin 2 enables the heat exchanger to save 21% of the refrigerant filling amount while maintaining the heat exchange efficiency compared with the existing air conditioning heat exchanger at the same power. A single heat exchanger saves at least about 100g of refrigerant.

[0021] In some embodiments, each through hole of the fin 2 passes through the heat exchange tube 1, and the area of ​​the fin 2 excluding the through hole is the effective heat exchange area, and the ratio of the effective heat exchange area to the total area of ​​the fin 2 is 0.957~0.973. The refrigerant transfers heat by phase change in the heat exchange tube 1. The setting of the fin 2 greatly increases the heat transfer area and reduces the convection heat transfer thermal resistance on both sides. The heat exchange effect at the through hole through which the heat exchange tube 1 passes can be basically ignored, and the area of ​​the fin 2 excluding the through hole is used as the effective heat exchange area. By setting the effective heat exchange area, the heat exchange efficiency is improved.

[0022] In some embodiments, a new generation of environmentally friendly air conditioning heat exchanger includes a heat exchange tube 1 and a fin 2, wherein the fin 2 is arranged along the length direction of the heat exchange tube 1; the fin 2 has a through hole and a support wing, the heat exchange tube 1 passes through the through hole on the fin 2 and is interference fit with the through hole, the support wing is arranged on the front of the fin 2, and the support wing of the rear fin 2 is against the back of the front support wing; the outer diameter of the heat exchange tube 1 is 3.8mm~4.3mm, there are multiple heat exchange tubes 1, the heat exchange tubes 1 are parallel to each other, and the heat exchange tubes 1 are connected to form a refrigerant flow path, and the refrigerant fills the refrigerant flow path. The weight ratio of the heat exchange tube 1 and the refrigerant is: 1.48~2.75. The heat exchange tube 1 of the heat exchanger has a reduced diameter, and the configuration of the heat exchange tube 1 and the fin 2 makes the heat exchanger save more than 25.6% of materials compared with the existing air conditioning heat exchanger (heat exchange tube 1 diameter 5mm) at the same power, and the heat exchange energy efficiency ratio is improved by 0.15~0.42.

[0023] In some embodiments, the weight ratio of the heat exchange tube 1 to the refrigerant is 2.1-2.15. The heat exchange tube 1 is made of copper tube or copper alloy tube, and the minimum copper saving of a single heat exchanger is about 787g.

[0024] In some embodiments, each through hole of the fin 2 passes through the heat exchange tube 1, and the heat exchanger includes a plurality of heat exchange tubes 1. Each heat exchange tube 1 includes two parallel straight tube sections and a curved tube section located between the straight tube sections. The curved tube sections of all heat exchange tubes 1 are located on the same side of the heat exchanger. The straight tube sections of the heat exchange tubes 1 pass through the through holes of the fins 2. There are gaps between adjacent fins 2. The fins 2 passing through the heat exchange tubes 1 form a fin 2 assembly. The weight ratio of the heat exchange tube 1 to the fin 2 assembly is: 0.56~1.03. The diameter of the heat exchange tube 1 of the heat exchanger is reduced. The configuration of the heat exchange tube 1 and the fin 2 enables the heat exchanger to save about 42% of the material of the fin 2 compared with the existing air-conditioning heat exchanger (heat exchange tube 1 diameter 5mm) at the same power.

[0025] In some embodiments, the weight ratio of the heat exchange tube 1 to the fin 2 assembly is 0.79-0.8. The fin 2 is made of aluminum fin 2, and the minimum aluminum saving of a single heat exchanger is about 750g.

[0026] In some embodiments, each fin 2 has three dimensions: length, width and height. Among these three dimensions, the smallest dimension is used as thickness, the largest dimension is used as length, and the remaining third dimension is used as width. The projected area of ​​the fin 2 is calculated by multiplying the length by the width. The ratio of the sum of the projected areas of all fins 2 in the fin 2 assembly to the weight of the refrigerant is: 0.065~0.071kg / m 3 Compared with the existing heat exchanger, the heat exchange efficiency ratio of this heat exchanger is improved by 0.15~0.42, and the heat exchanger capacity is increased by about 255w.

[0027] In some embodiments, the heat exchanger includes a plurality of heat exchange tubes 1, each heat exchange tube 1 includes two parallel straight tube sections and a curved tube section between the straight tube sections, the curved tube sections of all heat exchange tubes 1 are located on the same side of the heat exchanger, the straight tube sections of the heat exchange tubes 1 pass through the through holes of the fins 2, there are gaps between adjacent fins 2, and the fins 2 passing through the heat exchange tubes 1 form a fin 2 assembly. In this way, the heat exchanger has a higher ability to prevent dust accumulation and blockage, the air flows horizontally outside the tube for heat exchange, the turbulence of the air is enhanced, and blockage can be effectively prevented.

[0028] In some embodiments, the fins 2 are punched on a metal substrate, and the ratio of the wall thickness of the heat exchange tube 1 to the thickness of the metal substrate is 2.1 to 4.5. Preferably, the ratio of the wall thickness of the heat exchange tube 1 to the thickness of the metal substrate is 3. In this way, when the heat exchange tube 1 is expanded, the heat exchange tube 1 and the fins 2 can be well changed from a clearance fit to an interference fit, so that the connection between the heat exchange tube 1 and the fins 2 is reliable.

[0029] In some embodiments, the hole wall of the through hole of the fin 2 has an extension section extending outward, the extension section is cylindrical, the other end of the extension section has an outwardly expanded bell mouth, and the ratio of the height of the extension section to the width of the bell mouth is 10 to 16. Preferably, the ratio of the height of the extension section to the width of the bell mouth is 13.

[0030] In this way, the bell mouth can resist the previous (or next) fin 2 during tube expansion, so that the extension section of the current fin 2 does not insert into the through hole of the previous (or next) fin 2. At the same time, the setting of the extension section and the bell mouth maintains the gap between two adjacent fins 2, thereby meeting the requirement of the ratio of the cumulative gap width between the fins 2 to the total width of the fin 2 assembly, and improving the heat exchange performance and anti-clogging performance of the heat exchanger. The direction from the first fin 2 to the last fin 2 is the width direction of the heat exchanger. After the single fin 2 forms the fin 2 assembly, the fin 2 is perpendicular to the width direction of the heat exchanger.

[0031] In some embodiments, the straight tube sections of all heat exchange tubes 1 are parallel to each other, the center lines of the heat exchange tubes 1 in the same row are located on the same plane, and there is at least one row of heat exchange tubes 1 .

[0032] In some embodiments, the curved pipe section is exposed from the fin 2 assembly, and both ends of the straight pipe section are also exposed from the fin 2 assembly. Preferably, the ratio of the exposed width of the curved pipe section to the exposed width of the straight pipe section is 0.9 to 1.1. Optimally, the ratio of the exposed width of the curved pipe section to the exposed width of the straight pipe section is 1.

[0033] In some embodiments, all heat exchange tubes 1 pass through corresponding through holes on fins 2, fins 2 and heat exchange tubes 1 are interference fit, multiple heat exchange tubes 1 arranged in parallel and with their central axis in the same plane are regarded as a group, and the heat exchanger has at least one group of heat exchange tubes 1; the heat exchange tubes 1 in the same group are arranged at equal intervals along the length of fins 2. For a single cooling machine, one group of heat exchange tubes 1 can complete the work. For a cooling and heating machine, two or more groups of heat exchange tubes 1 may be required.

[0034] In some embodiments, the heat exchanger has two straight plate portions and a transition portion connecting the two straight plate portions, and the transition portion is arc-shaped.

[0035] The contents described in the embodiments of this specification are merely an enumeration of the implementation forms of the inventive concept. The protection scope of the present invention should not be regarded as limited to the specific forms described in the embodiments. The protection scope of the present invention also extends to equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.

Claims

1. A new generation of environmentally friendly air conditioning heat exchanger, comprising a heat exchange tube and a fin, wherein the fin is arranged along the length direction of the heat exchange tube; the fin is provided with a through hole and a supporting wing, the heat exchange tube passes through the through hole on the fin and is interference fit with the through hole, the supporting wing is arranged on the front side of the fin, and the supporting wing of the rear fin abuts against the back side of the supporting wing of the front fin; the characteristics are: the outer diameter of the heat exchange tube is 3.8mm~4.3mm, there are multiple heat exchange tubes, the heat exchange tubes are parallel to each other, a refrigerant flow path is formed after the heat exchange tubes are connected, the refrigerant fills the refrigerant flow path, and the weight ratio of the heat exchange tube to the refrigerant is: 1.48~2.

75.

2. The new generation environmentally friendly air conditioning heat exchanger as claimed in claim 1, characterized in that: The weight ratio of heat exchange tubes to refrigerant is 2.1~2.

15.

3. The new generation environmentally friendly air conditioning heat exchanger according to claim 1, characterized in that: Each through hole of the fin passes through the heat exchange tube. The heat exchanger includes a plurality of heat exchange tubes. Each heat exchange tube includes two parallel straight tube sections and a curved tube section located between the straight tube sections. The curved tube sections of all heat exchange tubes are located on the same side of the heat exchanger. The straight tube sections of the heat exchange tubes pass through the through holes of the fins. There are gaps between adjacent fins. The fins passing through the heat exchange tubes form a fin assembly. The weight ratio of the heat exchange tube to the fin assembly is: 0.56~1.

03.

4. The new generation environmentally friendly air conditioning heat exchanger according to any one of claims 1 to 3, characterized in that: The weight ratio of the heat exchange tube to the fin assembly is: 0.79~0.8; the fins are made of aluminum fins, and a single heat exchanger saves a minimum of 750g of aluminum.

5. The new generation environmentally friendly air conditioning heat exchanger as claimed in claim 1, characterized in that: Each fin has three dimensions: length, width and height. The smallest dimension is used as thickness, the largest dimension is used as length, and the remaining third dimension is used as width. The projected area of ​​the fin is calculated by multiplying the length by the width. The ratio of the sum of the projected areas of all fins in the fin assembly to the weight of the refrigerant is: 0.065~0.071kg / m 3 .

6. The new generation environmentally friendly air conditioning heat exchanger as claimed in claim 5, characterized in that: The hole wall of the through hole of the fin has an extension section extending outward, the extension section is cylindrical, the other end of the extension section has an outwardly expanded bell mouth, and the ratio of the height of the extension section to the width of the bell mouth is 10 to 16. Preferably, the ratio of the height of the extension section to the width of the bell mouth is 13.

7. The new generation environmentally friendly air conditioning heat exchanger as claimed in claim 6, characterized in that: The straight tube sections of all heat exchange tubes are parallel to each other, the center lines of the heat exchange tubes in the same row are located on the same plane, and there is at least one row of heat exchange tubes.

8. The new generation environmentally friendly air conditioning heat exchanger as claimed in claim 7, characterized in that: All heat exchange tubes pass through corresponding through holes on the fins respectively. The fins and heat exchange tubes are interference fit. Multiple heat exchange tubes arranged in parallel and with their central axes located in the same plane are regarded as a group. The heat exchanger has at least one group of heat exchange tubes. The heat exchange tubes in the same group are arranged at equal intervals along the length of the fins.

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