CN104006694A - Hexagonal and ditrigonal mixed channel contact-heat-resistance-free heat transfer element - Google Patents

Abstract

The invention designs a hexagonal and double triangular mixed channel non-contact thermal resistance heat transfer element applied to various heat exchangers, which belongs to the technical field of heat exchange. It is composed of corrugated fins and rectangular heat transfer flat tubes. Hexagonal and double triangular pipes are evenly distributed on the heat transfer flat tubes. The bearing capacity has been greatly improved. The non-contact thermal resistance heat transfer element of the hexagonal and double triangular mixed channels enhances the strength of the heat transfer element and improves its ability to work under harsh conditions. The corrugated cooling fins and heat transfer flat tubes are integrally formed without Welding; no contact thermal resistance, high heat transfer efficiency; simple manufacturing process, compact structure, small size, strong vibration resistance, so it can be widely used in heat exchangers of air conditioners, refrigeration equipment, vehicles and other products.

Description

Hexagonal and double triangular mixed channel non-contact thermal resistance heat transfer element

technical field

The invention relates to a hexagonal and double triangular mixed channel non-contact thermal resistance heat transfer element applied to various heat exchangers, belonging to the category of thermodynamic mechanical devices.

Background technique

The heat transfer elements used on the heat exchangers of existing air conditioners, vehicles, and refrigeration equipment are generally composed of copper tubes (or aluminum tubes) and aluminum fins. It is a split structure, the manufacturing process is complicated, the manufacturing cost is increased, the performance is poor, and the contact thermal resistance is increased, the strength is weak, and the anti-vibration ability is poor. It is generally composed of copper tubes, aluminum tubes or microchannel tubes and aluminum fins, and the heat transfer tubes and fins of the heat transfer elements used at this stage are split structures, so that the contact heat between the fins and the heat transfer tubes The resistance is relatively large; the anti-vibration ability is poor, and the working environment of the heat exchanger in construction machinery is harsh, which often leads to local loosening or even fracture at the connection between the cooling fin and the heat transfer tube after a period of time, so It will also increase the contact thermal resistance, resulting in a significant decline in its heat transfer performance; at the same time, due to the lack of copper resources in China, the price of copper used to manufacture heat transfer tubes has risen in recent years, greatly increasing the production cost of heat exchangers. At the same time, the channel strength of the heat transfer flat tube in the existing heat transfer element is weak, and its service life is low when working under severe conditions, and in severe cases, production and life will be affected. And anti-collision force, bearing capacity are also poor. In order to avoid the above defects, the present invention designs a non-contact thermal resistance heat transfer element with hexagonal and double triangular mixed channels. At the same time, the load-bearing capacity, pressure resistance and anti-collision force have all been greatly improved. The non-contact thermal resistance heat transfer element of the hexagonal and double triangular mixed channels enhances the strength of the heat transfer element and improves the ability of the heat transfer element to work under relatively harsh conditions. It also reduces the production cost. The heat transfer element is an aluminum integral structure, and there is no contact thermal resistance between the heat dissipation fins and the heat transfer tube, which improves the heat transfer performance; the structure is compact, the heat transfer efficiency is high, and the heat transfer of the heat exchanger The improved thermal performance also enables simple processing and saves material.

Contents of the invention

The non-contact thermal resistance heat transfer element of the hexagonal and double triangular mixed channel of the present invention is composed of heat dissipation fins and heat transfer tubes. The heat dissipation fins and heat transfer tubes are aluminum integral structures, which are integrally processed and formed. Corrugated, the crest is a sharp angle with an angle of α; the trough is a round valley with a radius of R, the wave height is H, and the wavelength is S. The corrugated fins are located on the upper and lower sides of the heat transfer tube, perpendicular to the heat transfer tube, the distance between the fins is S _f , the thickness of the fins is δ, and the height is H _p ; the section thickness of the heat transfer tube is W ₁ , A rectangular flat tube with a width of L _1. There are multiple double triangular and hexagonal tubes evenly arranged in the heat transfer tube along the axial direction. The bottom of the double triangle has a side length of W ₂ and a height of L ₂ . The side length of the shape is L3, and the distance between each rectangular channel is _L4 .

Compared with the heat transfer elements of existing heat exchangers, the hexagonal and double triangular mixed channel non-contact thermal resistance heat transfer elements designed by the present invention have the following advantages:

(1) The heat transfer performance is significantly improved. The non-contact thermal resistance heat transfer element of the hexagonal and double triangular mixed channels of the present invention, the hexagonal and double triangular heat transfer channels, the heat dissipation ratio has been greatly improved, and the heat transfer coefficient has been improved. The tube adopts integral type, which eliminates the contact heat resistance, so the heat transfer performance is good. Compared with the existing heat transfer element, the heat transfer coefficient K of the isosceles triangular non-contact heat transfer element can be increased by 25-40%.

(2) Under the condition of transferring the same amount of heat, the volume and weight of the hybrid heat transfer element can be reduced by 20-39%, saving a lot of materials and reducing production costs.

(3) Radiating fins and heat transfer tubes are integrated, no welding is required, and no pickling process is required, which simplifies the manufacturing process and does not pollute the environment.

(4) Due to the non-contact thermal resistance heat transfer element with hexagonal and double triangular mixed channels, the impact resistance, pressure resistance, and load bearing capacity of the element have been greatly improved, and the process performance is good.

Concrete structure of the present invention is provided by accompanying drawing 1,2,3.

Description of drawings

Accompanying drawing 1 is the front view of the non-contact thermal resistance heat transfer element of the hexagonal and double triangular mixing channels;

Accompanying drawing 2 is the top view and detailed enlarged view of the non-contact thermal resistance heat transfer element of the hexagonal and double triangular mixing channels;

Accompanying drawing 3 is the left side view of the non-contact thermal resistance heat transfer element of the hexagonal and double triangular mixing channels.

Detailed ways

As shown in Figures 1, 2 and 3, the hexagonal and double triangular mixed channel non-contact thermal resistance heat transfer element of the present invention is composed of cooling fins 1 and heat transfer flat tubes 2, and the cooling fins 1 and heat transfer flat tubes 2 are In one piece, the heat dissipation fins 1 are located on the upper and lower sides of the heat transfer flat tube 2, the heat dissipation fins 1 on the upper and lower sides are corrugated, the heat dissipation fins 1 are perpendicular to the heat transfer flat tube 2, and the heat dissipation fins 1 The spacing is S _f , the thickness of heat dissipation fin 1 is δ, the height is H _p , the wavelength of corrugated heat dissipation fin 1 is _S , and the wave height is _H. In the flat tube 1, several double-triangular and hexagonal passages that _are not connected to each other are evenly arranged along the axial direction. The number of passages is 3 (see Figure ₁ ). The side length of the shape is L ₃ , and the distance between the channels 3 is L ₄ . When the heat transfer element is working, high-temperature fluid (such as water or oil) flows in from one end of each double triangle and hexagonal channel in the heat transfer flat tube 2, and then flows out from the other end of each double triangle and hexagonal channel, The air with a lower temperature sweeps across the heat dissipation fins 1 outside the heat transfer flat tubes 2 , thereby realizing heat exchange between the hot fluid in the heat transfer flat tubes 2 and the cold air flowing through the heat dissipation fins 1 .

Claims (3)

1. the contactless thermal resistance heat transfer element in hexagon and double triangle hybrid channel, comprises heat transfer flat tube and ripple radiating fin, and wherein, heat transfer flat tube and ripple radiating fin are aluminium matter monolithic construction, one machine-shaping.

2. the contactless thermal resistance heat transfer element in hexagon according to claim 1 and double triangle hybrid channel, is characterized in that: described radiating fin is totally corrugated, and the spacing between radiating fin is S _f, radiating fin thickness is δ, is highly H _p, the wavelength of radiating fin is S, wave height is H; Corrugated fin is positioned at the upper and lower both sides of heat-transfer pipe.

3. the contactless thermal resistance heat transfer element in hexagon according to claim 1 and 2 and double triangle hybrid channel, is characterized in that: on heat transfer flat tube, double triangle passage and hexagonal channel are uniformly distributed, the section thickness of double triangle passage is W ₂, be highly L ₂, hexagonal length of side is L ₃, the spacing between each passage is L ₄.