CN108387130A - A kind of composite fin heat exchanger based on bionic principle - Google Patents

Abstract

The invention discloses a composite fin heat exchanger based on the principle of bionics, which comprises several bionic airfoil fins, the bionic airfoil fins include an advection part, and one end of the advection part extends out of the plate and extends outward along the thickness direction of the plate The telescopic part is formed, and the end of the telescopic part is drawn inward along the plate thickness direction to form a semi-elliptic windward part; a number of small holes are penetrated on the bionic airfoil fins, and the small holes on adjacent bionic airfoil fins are interlaced. The thickness of the fins of the bionic airfoil of the invention gradually decreases along the airflow direction, the airflow channel is widened, the frictional resistance of the airflow is reduced, and the noise above 1000HZ can be effectively suppressed. In addition, by setting staggered small holes on the fins of the bionic airfoil, each small hole forms a sound-absorbing cavity, which can reduce noise below 1000HZ, and has a wide frequency range of noise reduction and good comfort. In addition, when the airflow passes through the small hole, due to the small diameter of the small hole, the speed of the airflow flowing to the small hole increases, forming a jet heat exchange and improving the heat transfer effect of the heat exchanger.

Description

A Composite Fin Heat Exchanger Based on Bionic Principle

technical field

The invention relates to a fin heat exchanger, in particular to a composite fin heat exchanger based on the bionic principle.

Background technique

With the improvement of the quality of life, in addition to energy-saving requirements, people's requirements for the mute performance of air conditioners and other white goods are constantly increasing. As an important indicator of air conditioning comfort, the noise of indoor fan coil units has attracted more and more attention from users. The finned heat exchangers of existing air-conditioning products generally only consider the heat exchange and energy-saving performance requirements, and the emphasis on noise reduction and noise reduction is mainly concentrated on the motor. In fact, since most fan coil units are concealed, the noise generated by the motor inside the fan coil unit is mainly transmitted to the room through the air supply port. On the other hand, the flow noise of fresh air and fin heat exchangers is also an important noise source.

On the website of the State Intellectual Property Office of the People's Republic of China, 2 patents related to the present invention were found, and the specific information is as follows:

(1) Name: Central air-conditioning fan coil noise reduction device

Application number: CN201320726763.5

Inventor: Shi Xianhu

Abstract: A central air-conditioning fan coil unit noise reduction device, which relates to the field of noise treatment technology. It includes an air inlet and an air outlet that communicate with the fan coil unit, and the air inlet and the air outlet are equipped with a folded muffler, and a plurality of "Piece" type mufflers are arranged inside the folded muffler. The utility model not only does not affect the air output volume of the air conditioner, but also reduces its noise.

(2) Name: A low-noise axial flow fan composite bionic airfoil blade

Application number: CN201710455803.X

Inventors: Zhang Chengchun; Wang Jing; Bao Yangchun; Zhang Xiumei; Yue Yongli; Ren Luquan

Abstract: A compound bionic airfoil blade of a low-noise axial flow fan belongs to the technical field of fluid mechanical blade design and flow control. The airfoil used in the design of the composite bionic airfoil blade proposed by the present invention is a modified airfoil of NACA 6405 airfoil. Multiple bionic units are connected in space. The blade has periodic concave leading edge, tine structure trailing edge and ridge structure surface features. The pressure surface and suction surface of the blade are both spatial curved surfaces composed of multi-segment curved surfaces. Two The middle part of the section where the ridge line is located is a bionic unit, and the width and thickness of the middle part of the ridge line are both smaller than the positions of the two ridge lines of the bionic unit. The invention can effectively control the spatio-temporal evolution process of laminar flow boundary layer or turbulent flow boundary layer, has low sensitivity to Reynolds number, and can make the axial flow fan have good aerodynamic performance and acoustic performance under all working conditions .

As can be seen from the above-mentioned patents, the existing air-conditioning products have the following deficiencies in noise reduction and noise reduction:

(1) Only considering the reduction of fan noise, or by changing the macroscopic shape of the tuyere to achieve noise reduction, there is a lack of muting solutions for fin heat exchangers from a microscopic point of view;

(2) The noise reduction structure design is relatively simple, and there is no consideration on how to reduce the friction noise between the fresh air at the air supply port and the fins, and the overall noise reduction effect is limited.

(3) Quietness and energy saving are the two core qualities of air conditioners. The current heat exchanger products do not give enough consideration to how to balance quietness and energy saving.

Contents of the invention

The purpose of the present invention is to provide a composite fin heat exchanger based on the bionic principle, through optimizing the design of the microstructure of the fins, at the same time, noise reduction and quietness of the heat exchanger can be realized and heat exchange can be enhanced.

In order to achieve the purpose of the above invention, the technical solution of the present invention is: a composite fin heat exchanger based on the principle of bionics, including a number of plate-shaped fins arranged in parallel, the fins are bionic airfoil fins, bionic airfoil fins The fins include advection parts arranged in parallel, and the advection parts are in the shape of a flat plate; one end of the advection part extends outward along the thickness direction of the plate to form a telescopic part, and the end of the telescopic part is drawn inward along the thickness direction of the plate to form a semi-ellipse windward part;

The bionic airfoil fins are penetrated with several small holes, the small holes are arranged along the plate thickness direction, and the small holes on the adjacent bionic airfoil fins are interlaced.

As a preference of this solution, the telescoping portion is an isosceles trapezoid.

As a preference of this solution, the side wall of the bionic airfoil fin is provided with a rectangular grid, the small holes are set at the node positions of the rectangular grid, and the small holes are located in the corresponding rectangular grid of the adjacent bionic airfoil fin. The center position of the grid.

As a preference of this solution, the bionic airfoil fins are made of aluminum, copper metal material or plastic.

As a preference of this solution, the ratio of the windward long semi-axis to the short semi-axis is 4:1.

As a preference of this solution, the pitch of the advective portion is 2-5 mm.

As a preference of this solution, the diameter of the small hole is 0.2-0.5mm.

The beneficial effects of the present invention are:

(1) The thickness of the bionic airfoil fins of the present invention decreases gradually along the airflow direction, the airflow passages widen, the friction between the airflow and the fins decreases, and the noise above 1000HZ can be effectively suppressed; in addition, by setting The staggered small holes make each small hole form a sound-absorbing cavity, which can reduce the noise below 1000HZ, with a wide frequency range of noise reduction and good comfort.

(2) When using the present invention, when the airflow flows from one side of the bionic airfoil fin to the other side through the small hole under the influence of the pressure difference, the airflow velocity flowing to the small hole increases due to the small hole diameter, forming a jet flow heat, improve the heat transfer effect of the heat exchanger, energy saving and environmental protection.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic diagram of a rectangular grid of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

As shown in Figure 1, a composite fin heat exchanger based on the bionic principle includes several plate-like fins arranged in parallel, the fins are bionic airfoil fins 10, and the bionic airfoil fins 10 include parallel arranged The advection portion 11, the pitch of the advection portion 11 is 2-5mm; the advection portion 11 is a flat plate, one end of the advection portion 11 extends out of the plate, and extends outward along the thickness direction to form a telescopic portion 12, and the end of the telescopic portion 12 is along the thickness of the plate. The direction is gathered inwardly to form a semi-elliptic windward part 13; the ratio of the major semi-axis to the minor semi-axis of the windward part 13 is 4:1.

The bionic airfoil fin 10 is penetrated with several small holes 14 arranged along the plate thickness direction, and the small holes 14 on adjacent bionic airfoil fins 10 are interlaced with each other; the diameter of the small holes is 0.2-0.5mm.

The telescopic part 12 is an isosceles trapezoid.

The side wall of the bionic airfoil fin 10 is provided with a rectangular grid 15, the small hole 14 is arranged at the node position of the rectangular grid 15, and the small hole 14 is located at the corresponding rectangular grid of the adjacent bionic airfoil fin 10 15 central location.

The bionic airfoil fin 10 is made of aluminum, copper metal material or plastic.

The thickness of the bionic airfoil fin 10 of the present invention gradually decreases along the airflow direction, and the airflow channel is widened, so that the gas can flow close to the wall surface of the fin, reduce the frictional resistance between the airflow and the fin, and effectively suppress the noise above 1000 Hz. In addition, by setting staggered small holes on the fins of the bionic airfoil, each small hole forms a sound-absorbing cavity, which can reduce noise below 1000HZ, and has a wide frequency range of noise reduction and good comfort.

When using the present invention, when the airflow flows from one side of the bionic airfoil fin to the other side through the small hole under the influence of the pressure difference, the airflow velocity flowing to the small hole increases due to the small hole diameter, forming a jet heat exchange and improving Heat transfer effect of heat exchanger, energy saving and environmental protection.

The described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of the present invention.

Claims (7)

1. A composite fin heat exchanger based on the bionic principle, comprising several plate-shaped fins arranged in parallel, characterized in that the fins are bionic airfoil fins, and the bionic airfoil fins include parallel advection The advection part is flat plate shape; one end of the advection part extends out of the plate, and stretches outward along the thickness direction to form a telescopic part, and the end of the telescopic part is retracted inward along the thickness direction to form a semi-elliptical windward part; The bionic airfoil fins are penetrated with several small holes, the small holes are arranged along the plate thickness direction, and the small holes on the adjacent bionic airfoil fins are interlaced. 2 . The composite fin heat exchanger based on the bionic principle according to claim 1 , wherein the expansion and contraction part is an isosceles trapezoid. 3 . 3. A composite fin heat exchanger based on the bionic principle as claimed in claim 1, wherein the side wall of the bionic airfoil fin is provided with a rectangular grid, and the small holes are arranged on the rectangular grid Node position, and the small hole is located at the center of the corresponding rectangular grid of the adjacent bionic airfoil fin. 4. A composite fin heat exchanger based on bionic principles as claimed in claim 1, wherein the bionic airfoil fins are made of aluminum, copper metal or plastic. 5 . The composite fin heat exchanger based on the bionic principle according to claim 1 , wherein the ratio of the windward long semi-axis to the short semi-axis is 4:1. 6 . The biomimetic composite fin heat exchanger according to claim 1 , wherein the pitch of the advective portion is 2-5 mm. 7 . 7 . The composite fin heat exchanger based on the bionic principle according to claim 1 , wherein the diameter of the small holes is 0.2-0.5 mm.