WO2019029752A1

WO2019029752A1 - Heat exchange fin and fin-type heat exchanger

Info

Publication number: WO2019029752A1
Application number: PCT/CN2018/107090
Authority: WO
Inventors: 吴红霞; 刘忠民; 陈绍楷
Original assignee: 海信家电集团股份有限公司; 海信（广东）空调有限公司
Priority date: 2017-08-10
Filing date: 2018-09-21
Publication date: 2019-02-14

Abstract

A heat exchange fin, comprising a substrate (1), the substrate (1) being provided with a plurality of heat exchange tube holes (11) and a plurality of slit pieces (12), the distance (h1) between the centre of each heat exchange tube hole (11) and a back side edge of the substrate (1) being less than the distance (h2) between the centre of the heat exchange tube hole (11) and an air inlet side edge of the substrate (1), the plurality of heat exchange tube holes (11) being arranged at intervals along the length direction of the substrate (1), the length direction of the substrate (1) being perpendicular to the direction from the air inlet side to the back side, the slit pieces (12) facing towards the back side and the air inlet side to form openings (121) for air to pass through, the plurality of slit pieces (12) being circumferentially arranged at intervals around the heat exchange tube holes (11).

Description

Heat exchange fin and fin heat exchanger

This application is required to be submitted to the China Patent Office on August 10, 2017, the application number is 201720997845.1, and the name is “a heat exchange fin and fin heat exchanger” and submitted to the China Patent Office on August 10, 2017. The priority and benefit of the Chinese patent application, which is incorporated herein by reference in its entirety by reference in its entirety in its entirety in the the the the the the the the the the

Technical field

The present disclosure relates to the field of heat exchanger technology, and more particularly to a heat exchange fin and a fin heat exchanger.

Background technique

Air conditioner is a kind of household appliance commonly used in the home, which can adjust the temperature and humidity of indoor air. The heat exchanger is an important structural unit in the air conditioner. Generally, the heat exchanger in the air conditioner can adopt a finned heat exchanger.

The finned heat exchanger comprises a plurality of fins and a plurality of heat exchange tubes, a plurality of fins are arranged in parallel, a plurality of heat exchange tube holes are formed on each of the fins, and the plurality of heat exchange tubes are respectively disposed in the plurality of heat exchange tubes Inside the heat pipe hole.

Public content

In a first aspect, the present disclosure provides a heat exchange fin, comprising a substrate, the substrate is provided with a plurality of heat exchange tube holes and a plurality of slits; a center of each of the heat exchange tube holes and the base The distance between the leeward side edges of the sheet is smaller than the distance between the center of the heat exchange tube hole and the inlet side edge of the substrate, and the plurality of heat exchange tube holes are spaced apart along the length direction of the substrate. a direction perpendicular to the windward side toward the leeward side is a length direction of the substrate; the slit sheet forms an opening through which air can pass toward the leeward side and the air inlet side, and the plurality of the slits The circumferential spacing of the heat exchange tube holes is arranged.

In a second aspect, the present disclosure further provides a finned heat exchanger comprising the heat exchange fin and the plurality of heat exchange tubes provided in the above first aspect, wherein the plurality of heat exchange fins are disposed in parallel, and the plurality of The heat exchange tubes are disposed through the plurality of heat exchange tube holes of the heat exchange fins.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present disclosure. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work.

1 is a schematic view of a heat exchange fin provided by some embodiments of the present disclosure;

Figure 2 is a schematic cross-sectional view taken along line C-C of Figure 1;

Figure 3 is a schematic cross-sectional view taken along line A-A of Figure 1;

Figure 4 is an enlarged view of a portion B of Figure 1;

Figure 5 is a front elevational view of a finned heat exchanger according to an embodiment of the present disclosure;

Figure 6 is a left side elevational view of a finned heat exchanger provided in accordance with an embodiment of the present disclosure.

Detailed ways

The technical solutions in the embodiments of the present disclosure are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present disclosure. It is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without departing from the inventive scope are the scope of the disclosure.

In the description of the present disclosure, it is to be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", The orientation or positional relationship of the "top", "bottom", "inside", "outside" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying The device or component referred to must have a particular orientation, is constructed and operated in a particular orientation, and thus is not to be construed as limiting the disclosure.

As mentioned above, the heat exchanger is an important structural unit in the air conditioner. When the heat exchanger is in operation, the airflow flows from the heat exchanger side through the heat exchanger to the other side of the heat exchanger, and the airflow passes through the adjacent The gap between the two fins is in contact with the heat exchange tube and exchanges heat with the refrigerant in the heat exchange tube. The side of the heat exchange tube that flows close to the airflow is the air inlet side, and the side that flows close to the airflow is the leeward side. When the airflow passes through the heat exchange tubes, it is blocked by the heat exchange tubes and separated by the heat exchange tubes. The separate air flows continue to flow along the surface of the heat exchange tube toward the tangential direction of the tube wall, and the flow inertia of the air flow causes no airflow through the leeward side of the heat exchange tube, so that the area where the leeward side of the heat exchange tube is located is not fully utilized, so that the heat exchange The heat exchange efficiency of the device is low.

The heat exchange fins are important components in the finned heat exchanger. Various structures on the fins (such as heat transfer tube holes and slits on the fins) can cause strong disturbance of air in the flow channel. And the flow boundary layer of air on the fins (the flow of fluids can be divided into two broad categories: one is the flow of fluid within the space defined by the solid wall, such as the flow within a pipe or channel, such flow is called The other is the flow of fluid from the outside of the object, such as wind blowing through the building, water flowing through the pier, fluid in the heat exchanger scouring the flow of the heat exchange tube, or moving the object in a stationary fluid (such as an airplane in the air Flying), etc. In the heat exchanger, due to the viscous effect of the air, the air in contact with the surface of the heat exchange tube is attached to the surface of the heat exchange tube, and the air layer attached to the surface of the heat exchange tube is called A flow boundary layer and a thermal boundary layer (also referred to as a temperature boundary layer) are thin layers of fluid formed near the flow wall of a viscous fluid (eg, air) that are characterized by heat. Ent (enthalpy), is the representation A function of the energy state of the system, generally denoted by H, is equal to the internal energy U of the system plus the product of the volume V and pressure P, i.e., H = U + PV) fracture, recombinant its value, thereby enhancing the heat transfer. The heat exchange fins and the finned heat exchangers provided by some embodiments of the present disclosure can improve the heat exchange efficiency of the heat exchanger and reduce the volume of the heat exchanger.

Referring to Figure 1, some embodiments of the present disclosure provide a heat exchange fin 10. The direction indicated by the arrow in Fig. 1 is the air inlet direction, the side of the heat exchange fin close to the arrow is the air inlet side, and the side of the heat exchange fin away from the arrow is the leeward side. The heat exchange fin 10 includes a substrate 1 having a plurality of heat exchange tube holes 11 and a plurality of slits 12, and a plurality of heat exchange tube holes 11 are spaced along the length direction of the substrate 1, vertically The direction of the arrow is the length direction of the substrate 1. A distance h1 between a center of the heat exchange tube hole 11 and an edge of the leeward side of the substrate 1 is smaller than a distance between a center of the heat exchange tube hole 11 and an edge of the air inlet side of the substrate 1. H2, the slit 12 forms an opening 121 through which air can pass, respectively, toward the leeward side and the inlet side, and a plurality of the slits 12 surround a circumferential interval of a heat exchange tube hole 11 corresponding thereto Settings.

In some embodiments of the present disclosure, two adjacent heat exchange tube holes 11 may use some of the slits 12 in common. For example, some of the slits 12 may be located around the circumference of one heat exchange tube hole 11 or around the circumference of the adjacent other heat exchange tube hole 11.

Figure 2 is a cross-sectional view taken along line CC of Figure 1, wherein the direction of the arrow in the direction of the vertical paper is the air entering the air inlet side of the heat exchange fin, and the air flowing through the opening 121 formed by the slit 12 to the leeward of the heat exchange fin side.

When the heat exchange fin provided by the embodiment of the present disclosure is applied to the fin heat exchanger, the distance h1 between the center of the heat exchange tube hole 11 and the leeward side edge of the substrate 1 is smaller than the heat exchange. The distance h2 between the center of the tube hole 11 and the edge of the air inlet side of the substrate 1 thus reduces the area of the trailing region formed by the air on the leeward side of the heat transfer tube projected onto the substrate 1. Since the heat exchange tube obstructs the flow of air, the air flows in a form of a vortex flow at a flow velocity lower than the flow velocity of the air on the air inlet side while passing through the leeward side of the heat exchange tube, and the air flows at a lower flow than the intake side. The area in which the velocity is filled with eddy currents is called the wake region. The substrate 1 is further provided with a plurality of slits 12, the openings 121 of the slits 12 are respectively directed toward the leeward side and the inlet side, and the plurality of slits 12 are circumferentially spaced around a corresponding heat exchange tube hole 11 thereof. It is provided that when the heat exchange tube is installed in the heat exchange tube hole 11 of the heat exchange fin 10, the slit 12 can break the air in the vicinity of the heat exchange tube without a separate attachment flow on the outer tube wall of the heat exchange tube, so that the air The flow direction is changed while passing through the opening 121, and more air is conducted to the leeward side of the heat exchange tube, thereby further shortening the wake region of the leeward side of the heat exchange tube and improving the heat exchange efficiency of the heat exchange fin.

In some embodiments, only one row of heat exchange tube holes is provided on each fin.

In some embodiments, the number of seams between the line between the center points of adjacent two heat exchange tube holes and the windward side edge of the fin is greater than the number of seams between the line and the leeward side edge of the fin.

As shown in FIG. 2, in some embodiments, the slit 12 is convex with respect to the surface of the substrate 1, and is combined with the surface of the substrate 1 into a trapezoid, and the slits 12 are respectively configured in a trapezoidal shape. Short hem and waist on both sides. As shown in Fig. 1, the length of the short base of the trapezoid and/or the number of slits gradually increases from the center of the heat exchange tube hole 11 to the inlet side or the leeward side. Here, "and/or" means either or both of the length of the short base of the trapezoid and the number of slits. With the above arrangement, the ventilation resistance of the heat exchange fins is small. The upper slit 12 of the substrate 1 can be opened more, and the number of slits near the air inlet side and the leeward side is increased, which helps to conduct air to the leeward side of the heat exchange tube and narrow the trailing area of the heat exchange tube. Improve the heat transfer effect of the heat exchange fins.

In some embodiments, as shown in FIGS. 3 and 1, the heat exchange fins 10 further include a bent structure 2 disposed along the edges of the air inlet side and the leeward side of the substrate 1. The bent structure 2 includes a first bent portion 21 and a second bent portion 22. The first bent portion 21 is bent and extended from a side of the air inlet side and the leeward side of the substrate 1 in a direction away from the protrusion of the slit 12, that is, in the state shown in FIG. 3, the first bend The portion 21 is located below the surface of the substrate 1, and the slit 12 is raised above the surface of the substrate 1. The second bent portion 22 extends from the edge of the first bent portion 21 in a direction toward the air inlet side or the leeward side, as shown in FIG. The bending structure 2 can increase the structural strength of the heat exchange fins and increase the heat exchange area of the heat exchange fins, thereby improving the heat exchange efficiency of the heat exchange fins.

In some embodiments, the above-described bent structure 2 is provided only on the edge of the air inlet side of the substrate 1, or the above-described bent structure 2 is provided only on the edge of the leeward side of the substrate 1.

In some embodiments, the extending direction of the second bent portion 22 is parallel to the surface of the substrate 1, or the second bent portion 22 extends from the edge of the first bent portion 21 toward the protrusion away from the slit, or The rim edge of the first bent portion 21 extends in a direction in which the slit is convex. If the second bent portion 22 extends from the edge of the first bent portion 21 toward the protrusion away from the slit, or extends from the edge of the first bent portion 21 toward the projection of the slit, the two exchanges The shape of the heat fins causes the airflow to be commutated more frequently in the heat exchanger, the wind speed loss is larger, and the air volume of the heat exchanger is smaller. Therefore, in some embodiments, a design in which the direction in which the second bent portion 22 extends is parallel to the surface of the substrate 1 is employed.

In some embodiments, the angle α between the first bent portion 21 and the second bent portion 22 may be an obtuse angle, a right angle, or an acute angle. In some embodiments, the angle between the first bent portion 21 and the second bent portion 22 is a right angle or an acute angle, and when the air passes through the bent structure 2, the air layer near the surface of the heat exchange fin is subjected to the first The resistance of the bent portion 21 is large, which reduces the flow velocity of the boundary layer air, thereby reducing the heat exchange efficiency of the heat exchange fins. Therefore, in some embodiments, the angle α between the first bent portion 21 and the second bent portion 22 is adopted as an obtuse angle, as shown in FIG. 3, the air inlet side and the leeward side of the substrate 1 The connection between the edge and the first bent portion 21 and between the first bent portion 21 and the second bent portion 22 is relatively smooth, which reduces the resistance of the bent structure 2 to the air from the air inlet side, thereby The heat exchange efficiency of the heat exchange fins is improved.

In some embodiments, the extending direction of the second bent portion 22 is parallel to the surface of the substrate 1, and the angle α between the first bent portion 21 and the second bent portion 22 is an obtuse angle.

In some embodiments, the edges of the heat exchange tube holes 11 are provided with a circular flange 13 which gradually increases in diameter in a direction away from the surface of the substrate 1. For example, the annular flange 13 is tapered or has a flare shape as shown in FIG. 3, which facilitates insertion of the heat exchange tube into the heat exchange tube hole 11 to facilitate the assembly operation of the heat exchanger.

If the spacing between adjacent heat exchange tube holes 11 on the heat exchange fins 10 is too large, in order to ensure the heat exchange efficiency of the heat exchanger using the heat exchange fins, the volume of the heat exchanger is large; The spacing between the adjacent heat exchange tubes 11 on the heat exchange fins is too small, and the heat exchanger of the heat exchange fins has a large wind resistance, which affects the heat exchange efficiency. Therefore, referring to FIG. 4, in some embodiments, the length L between the centers of the adjacent heat exchange tube holes 11 ranges from 16 to 17.5 mm, and the heat exchanger of the heat exchange fin has a small wind resistance. The volume is small, and the heat exchange efficiency of the heat exchange fins is also high.

Similarly, the width of the heat exchange fin 10 is too large, and the volume of the heat exchanger is too large; the width of the heat exchange fin 10 is too small, and the heat exchange efficiency of the heat exchanger is low, parallel to the indication in FIG. The direction of the arrow in the wind direction is the width direction of the substrate 1. Therefore, referring to FIG. 3, in some embodiments, the width W1 of the fin ranges from 16 to 22 mm, and the width W2 of the second bent portion 22 ranges from 1.2 to 2 mm to ensure heat exchange fins. The structure has high structural strength, and the heat exchange fins have high heat exchange efficiency at the bent structure 2. In some embodiments, the width of the slit 12 ranges from 1.0 to 1.5 mm.

On the basis of the above structure of the heat exchange fin 10, on the one hand, if the angle α between the first bent portion 21 and the second bent portion 22 is too large, the strength of the heat exchange fin is small; On the one hand, if the angle α between the first bent portion 21 and the second bent portion 22 is too small, the wind resistance of the heat exchanger is large. Therefore, in some embodiments, the angle α between the first bent portion 21 and the second bent portion 22 ranges from 145° to 160°.

Further, on the one hand, the height of the projection formed by the slit 12 with respect to the surface of the substrate 1 cannot be set too high, otherwise the structural strength of the fin may be affected; on the other hand, the slit 12 is opposite to the base. The height of the protrusion formed on the surface of the sheet 1 is too low, which increases the wind resistance of the heat exchanger. Thus, referring to Figure 3, in some embodiments, the height H of the projections of the seam 12 relative to the surface of the substrate 1 ranges from 0.5 to 0.8 mm.

Some embodiments of the present disclosure further include a finned heat exchanger 100 including a plurality of the above-described heat exchange fins 10 and a plurality of heat exchange tubes 20, the plurality of heat exchange fins 10 being disposed in parallel, and a plurality of heat exchange tubes 20 through one of the plurality of heat exchange tube holes 11 of the heat exchange fin 10, as shown in FIG. 6 is a left side view of the fin-type heat exchanger according to the embodiment of the present disclosure, wherein the direction indicated by the arrow in the figure is the air inlet direction, and the plurality of heat exchange tubes 20 are disposed one by one on the heat exchange fin 10 . In a plurality of heat exchange tube holes, a distance h1 between a center of the heat exchange tube hole and an edge of the leeward side of the substrate 1 is smaller than a center of the heat exchange tube hole and an edge of the air inlet side of the substrate 1. The distance between h2.

The finned heat exchanger 100 provided by some embodiments of the present disclosure can conduct more air to the leeward side of the heat exchange tube 10, shortening the wake region of the leeward side of the heat exchange tube 10, and the heat exchange efficiency of the heat exchanger is higher. . Therefore, the fin-type heat exchanger 100 of the embodiment of the present disclosure adopts a single-row heat exchange tube, which can maintain high heat exchange efficiency and reduce the volume of the air conditioner using the fin-type heat exchanger.

The above is only the specific embodiment of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the disclosure. It should be covered within the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be determined by the scope of the claims.

Claims

a heat exchange fin comprising a substrate, wherein the substrate is provided with a plurality of heat exchange tube holes and a plurality of slits;

a distance between a center of each of the heat exchange tube holes and a leeward side edge of the substrate is smaller than a distance between a center of the heat exchange tube hole and an edge of the inlet side of the substrate, and the plurality of the exchanges The heat pipe holes are spaced apart along the length direction of the substrate, and the direction perpendicular to the air inlet side toward the leeward side is the length direction of the substrate;

The slit forms an opening through which air can pass toward the leeward side and the inlet side, and a plurality of the slits are circumferentially spaced around the heat exchange tube hole.
The heat exchange fin according to claim 1, wherein said slit sheet is convex with respect to a surface of said substrate, and is combined with a surface of said substrate to form a trapezoid, said slits being respectively configured in a trapezoidal shape The short base and the waists on both sides, the length of the short bottom edge of the trapezoid and/or the number of slits gradually increase along the center of the heat exchange tube hole to the air inlet side and the leeward side.
The heat exchange fin according to claim 2, wherein the fin further comprises a bent structure disposed along an edge of the air inlet side and/or the leeward side of the substrate, the bending structure including the first a bent portion and a second bent portion;

The first bent portion is bent and extended from a side of the air inlet side and/or the leeward side of the substrate toward a direction away from the protrusion of the slit;

The second bent portion extends from the edge of the first bent portion toward the air inlet side and/or the leeward side.
The heat exchange fin according to claim 3, wherein the second bent portion extends in a direction parallel to a surface of the substrate.
The heat exchange fin according to claim 3, wherein an angle between the first bent portion and the second bent portion is an obtuse angle.
The heat exchange fin according to claim 1 or 2, wherein an annular flange is provided along a side of the heat exchange tube hole, and a diameter of the annular flange is gradually increased toward a surface away from the substrate. Big.
The heat exchange fin according to claim 1, wherein a length between adjacent centers of the heat exchange tubes is in the range of 16 to 17.5 mm.
The heat exchange fin according to claim 3 or 4, wherein the extending direction of the second bent portion is parallel to the width direction of the substrate, parallel to the direction in which the air inlet side is directed to the leeward side It is the width direction of the substrate.
The heat exchange fin according to claim 8, wherein the heat exchange fin has a width ranging from 16 to 22 mm, and the second bent portion has a width ranging from 1.2 to 2 mm.
The heat exchange fin according to claim 5, wherein an angle between the first bent portion and the second bent portion ranges from 145° to 160°.
The heat exchange fin according to claim 2, wherein a height of the trapezoid formed by bonding the slit to the surface of the substrate ranges from 0.5 to 0.8 mm.
The heat exchange fin according to claim 1, wherein only one row of said heat exchange tube holes is provided in each of said fins.
The heat exchange fin according to claim 1, wherein the number of the seams between the line between the center points of the adjacent two heat exchange tube holes and the windward side edge of the fin is larger than the line and the fin leeward The number of seams between the side edges.
A finned heat exchanger comprising a plurality of the heat exchange fins according to any one of claims 1 to 13 and a plurality of heat exchange tubes, wherein the plurality of heat exchange fins are arranged in parallel, The heat exchange tubes are disposed through the plurality of heat exchange tube holes of the heat exchange fins.