CN112739168A

CN112739168A - Narrow tube flow-collecting radiator

Info

Publication number: CN112739168A
Application number: CN202011596308.9A
Authority: CN
Inventors: 李文彬; 黄圣晖; 徐道春
Original assignee: Beijing Forestry University
Current assignee: Beijing Forestry University
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-04-30

Abstract

The invention provides a narrow tube type flow collecting radiator with a contraction-expansion structure, and belongs to the technical field of radiating devices. The radiator comprises base plate and a plurality of fin, and the base plate is flat cube, and base plate one side has the fin of equidistance evenly distributed, and fin thickness is 2mm ~ 4mm, 4 ~ 9 rows of narrow tubes of equipartition on the fin, and the distance between the narrow tube center line is 3mm, pipe diameter phi 1 mm. The two sides of the narrow tube are provided with a contraction-expansion angle of 15-45 degrees, so that the function of accelerating the air in the narrow tube can be realized. The radiator increases the contact area with air, improves the flow velocity of the air flowing through the narrow tube, enhances the convective heat transfer between the radiator and the air, and has the advantages of small thermal resistance, strong heat dissipation capability, light weight and the like.

Description

Narrow tube flow-collecting radiator

Technical Field

The invention relates to a radiator, in particular to a narrow-tube radiator with a contraction-expansion structure, and belongs to the technical field of radiating devices.

Background

With the continuous development of scientific technology, more and more electronic devices are developing towards miniaturization and light weight. The radiator can timely transfer heat generated by the electronic device to the surrounding environment so as to maintain high-performance operation of the electronic equipment. At present, fin radiators with the thickness of 1.3 mm-1.7 mm are mainly used in the market. The fin radiator mainly depends on the contact of the surface of the fin and air to carry out convective heat transfer, however, the thin fin has small disturbance on the air flow, and the heat cannot be fully radiated. From this, the radiator of a novel fin structure promotes heat dispersion urgently needed.

Disclosure of Invention

In view of the above, the present invention provides a narrow tube type heat collector with a contraction-expansion structure, which can effectively utilize the air flow and enhance the heat dissipation of the heat collector. The heat sink comprises a base plate and a plurality of fin parts.

The base plate (2) is shaped as a flat cube, and the length and width dimensions can be designed according to the size of the electronic device to be used. The thickness of the substrate can be designed in the range of 2mm to 5mm depending on the size of the length and width.

The fins (3) are uniformly arranged on one side of the base plate at equal intervals, the fin spacing is designed within the range of 2 mm-3 mm, and the number of the fins is determined according to the length of the base plate and the fin spacing. The thickness of each fin can be designed within the range of 2 mm-4 mm, and the height of each fin can be designed within the range of 10 mm-30 mm. Small-sized narrow tubes with the diameter phi of 1mm are longitudinally and uniformly distributed on the fins, the distance between the center lines of the narrow tubes is 3mm, and the number of the narrow tubes is designed within the range of 4-9 according to the height of the fins. The inclination angle of the two sides of the narrow pipe is 15-45 degrees.

In addition, the heat sink material in the above invention uses aluminum or copper.

In addition, the fins and the base plate of the radiator in the invention can be integrally formed, or the fins and the base plate can be fixed on the base plate in a welding and plugging mode after being respectively processed.

Has the advantages that:

(1) the invention can improve the heat dissipation capability of the radiator and enhance the heat dissipation capability. Convection heat transfer mainly occurs between the radiator and air, and the convection heat transfer formula is as follows:

Q＝hS(t_w-t_f)

where Q is the amount of heat exchange between the heat sink and the air, h is the convective heat transfer coefficient, S is the surface area of the heat sink in contact with the air, and t_w、t_fRespectively the temperature of the radiator surface and the temperature of the air. Therefore, the narrow tubes on the fins can increase the contact surface area of the radiator and air, and increase the heat transferred by the radiator, thereby improving the heat dissipation capacity.

(2) The invention can increase the air flow rate flowing through the radiator and improve the heat dissipation capability. The narrow tube structure can increase the flow velocity of air flowing through the tube, and according to the prior research, the narrow tube structure can increase the flow velocity of air flowing through the tube: h ≧ v. Therefore, the average flow velocity of the air in the radiator narrow tube is increased, and the heat exchange amount between the air and the air in the tube is increased. Compared with a single contraction structure, the contraction-expansion structure has the advantages that although the narrow tube effect is slightly reduced, the front side and the back side of the radiator do not need to be distinguished in use, and the usability of the radiator can be improved. Compared with the radiator without the narrow pipe structure, the radiator with the contraction-expansion structure can improve the heat dissipation amount by 5-10%.

(3) The invention can reduce the mass of the radiator. After the radiator fins are subjected to material removal, the overall quality of the radiator can be reduced, and the radiator fins are easier to install on small-sized electronic equipment.

Drawings

Figure 1 is a front view of a narrow tube collector heat sink of the present invention.

Fig. 2 is a sectional view a-a of fig. 1.

Figure 3 is an isometric view of a narrow tube collector heat sink of the present invention.

Description of reference numerals: 1-narrow tube radiator 2-base plate 3-narrow tube fin 4-small narrow tube 5-narrow tube two-side conical open pore

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, in the embodiments of the present invention, many technical details are set forth in order to provide the reader with a better understanding of the present application, and the technical solution claimed in the claims of the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.

A first embodiment of the invention relates to a slot collector heat sink, as shown in figures 1, 2 and 3, and essentially comprises a base plate (2) and a plurality of slot fins (3). The fins are uniformly arranged on one side of the base plate at equal intervals, and the fins and the base plate can be integrally formed or fixed on the base plate in a welding and plugging mode after being respectively processed.

As shown in fig. 1, the substrate 2 is a flat cube, and the length and width dimensions are generally designed according to the size of the desired electronic device. The thickness of the substrate is generally designed to be 3mm, but may be increased or decreased as appropriate depending on the size of the length and width. The surface of the cube is flat and free of obvious defects and scratches, and the smooth surface facilitates heat transfer between the electronic device and the narrow tube heat sink and also facilitates fixing the whole heat sink to the electronic device.

As shown in fig. 2, the fins (3) of the narrow tube are equally distributed on one side of the base plate. The thickness of each fin is generally designed to be 2mm, but may be increased to 4mm as appropriate depending on the number of fins and the pitch. The distance between the fins should be rounded according to the length of the base plate and the thickness of the fins so as to ensure the uniform and equidistant arrangement of the fins. The fins are provided with narrow tubes for air to flow through, the diameter of each narrow tube is phi 1mm, and the distance between the center lines is set to be 3 mm. Tapered grooves are arranged on two sides of the narrow pipe to process a contraction-expansion structure, and the contraction structure is an inclination angle of 15-45 degrees. As the air flows through the slots in the fins, it enters the slots via the constriction, and the flow rate of the air is increased due to the progressively decreasing cross-sectional area within the tube. The expansion structure reduces the narrow tube effect at the narrow tube outlet, but the average flow velocity of the air in the narrow tube is enhanced, and the contraction-expansion structure can ensure that the front side and the back side do not need to be distinguished when the narrow tube radiator is used, thereby enhancing the usability of the radiator.

The working principle is as follows: the narrow tube radiator is fixed on the electronic equipment, heat emitted by the electronic equipment is transferred into the narrow tube radiator through heat conduction, when air is blown to the surface of the narrow tube radiator at a certain initial speed, the air outside the narrow tube sweeps over the surfaces of the fins, the fins and the air perform heat convection, and the heat of the radiator is transferred to the environment. The air speed that flows through in the narrow pipe accelerates through the narrow pipe structure, and the air carries out stronger convection heat transfer in the narrow pipe, therefore more heat transfer in the fin is in the air, in transmitting to the surrounding environment to the heat-sinking capability of whole radiator has been promoted.

In summary, the above are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The heat radiator is characterized by comprising a base plate (2) and a plurality of fins (3), wherein the fins (3) are uniformly arranged on one side of the base plate (2) at equal intervals, and narrow tubes of contraction-expansion structures are uniformly distributed on the fins (3).

2. The heat sink of claim 1, wherein said narrow tube fins have a thickness of 2mm to 4mm, are equally spaced and have a fin pitch of 2mm to 3 mm.

3. A heat sink having a constriction-expansion structure as claimed in claim 1, wherein the constriction-expansion structure has a throat diameter of 1mm on the fin, the constriction-expansion structure has an inclination angle of 15 ° to 45 ° on both sides of the throat, and the pitch of the centerlines of the uniformly distributed throats on the fin is 3 mm.

4. The heat sink as claimed in claim 1, wherein the fin and the base plate are made of aluminum or copper, and the fin and the base plate are integrally formed; or after the fins and the base plate are respectively processed, the fins are fixed on the base plate in a welding and plugging mode.