CN211291149U - Double-side reinforced pitted-surface corrugated condenser pipe - Google Patents

Abstract

The utility model discloses a pitted surface ripple condenser pipe is reinforceed to two sides, it includes the heat exchange tube, and the heat exchange tube comprises the smooth section at both ends and pitted surface ripple section even as an organic whole, its characterized in that: the outer surface of the corrugated section with the rough surface is densely provided with micro bulges, and the geometrical shapes of the top surfaces of the micro bulges are square or rectangular; four adjacent micro-bulges are arranged in a square or rectangular shape; the surface of pitted surface ripple section is equipped with the spiral channel, and the spiral channel is continuous and carry through the pitted surface ripple section of whole heat exchange tube, and the surface is outside protruding between the adjacent channel, forms the curved surface, and the curved surface edge is connected with the channel, the utility model provides high heat transfer surface's hydrophobicity makes heat transfer surface's condensate film obtain quick attenuate, has improved condensation heat transfer performance greatly, can destroy the viscidity bottom of the boundary layer of intraductal cooling water, strengthens the heat transfer in the pipe, and the inside and outside two side heat exchanges have all obtained the reinforcement.

Description

Double-side reinforced pitted-surface corrugated condenser pipe

The technical field is as follows:

the utility model relates to a condenser pipe for the heat exchanger of central air conditioning system especially relates to two sides and strengthens rough surface ripple condenser pipe, belongs to and strengthens heat transfer technical field.

Background art:

according to the principle of heat transfer, a crucial factor influencing the condensation heat exchange performance is the hydrophobic performance of the heat exchange surface, and the static contact angle is an important index reflecting the hydrophobic performance of the surface. The contact angle is less than 90 degrees, and the surface is hydrophilic; the contact angle is larger than 90 degrees, and the surface is hydrophobic; the contact angle is more than 150 degrees, and the super-hydrophobic surface is formed. The larger the contact angle, the more excellent the hydrophobic property and the better the condensation effect. On the hydrophobic surface, part of gas can be retained in the coarse structure of the hydrophobic surface to form an air bag, and a liquid-vapor-solid composite interface is formed on the contact surface together with the condensate, so that the contact area of the condensate and the solid wall surface is reduced, the liquid flow speed on the surface is accelerated, the liquid can be rapidly separated from the surface of the heat exchange tube, the thickness of a liquid film is greatly reduced, the surface condensation heat exchange coefficient can be improved, and therefore, the effort of improving the hydrophobicity of the heat exchange surface is an important way for improving the condensation heat exchange efficiency. Engineering, the superhydrophobic surface can be obtained by spraying special materials on the surface to reduce the surface energy, or constructing a proper rough structure on the surface to realize the superhydrophobic performance of the heat exchange surface. According to the Wenzel theory, the hydrophobic property of a rough surface is greatly influenced, the contact angle of the rough surface is absolutely larger than that of a smooth surface, namely, the hydrophobicity is better than that of the smooth surface, and the Wenzel formula is as follows:

wherein r-roughness factor, i.e. the ratio of the actual area of the surface to the projected area, in practice, r is always greater than 1; -contact angle of rough surface;

-contact angle of a smooth surface;

currently, the preparation of industrial rough surfaces can be obtained by spraying on heat exchange surfaces, chinese patent CN 101782344A, which proposes to spray a mixed slurry of metal powder and binder onto heat exchange surfaces, then to sinter at 800-1000 ℃ to form rough surfaces of porous media. The disadvantage of this approach is that although the diameter of the metal powder is controllable, the size and shape of the pores in the porous dielectric thin layer cannot be controlled, so that the surface contains roughness structures of various dimensions, which greatly affects the performance. In addition, a rough surface with regularly arranged tiny protrusions can be manufactured in a machining mode, Chinese patent CN209069081U proposes that a plurality of groups of micro spiral grooves are arranged on the outer wall of a pipe body, the spiral grooves are divided into two groups, two groups of spiral grooves are staggered, the included angle of the two groups of spiral grooves is 30-90 degrees, the surface is divided into a plurality of diamond-shaped small blocks by four adjacent spiral grooves, the diamond-shaped small blocks are protruded and form a prismoid shape through extrusion on the grooves, and the densely arranged prismoids form a rough surface. The advantage of this method is that the pitted surface structure of the heat exchange surface can be accurately controlled, and the size of the contact angle is further influenced. However, the inner surface of the heat exchange tube shown in the patent is a smooth surface, and the heat exchange enhancement of the inner surface cannot be carried out, namely, the heat transfer enhancement at the two sides cannot be carried out, so that the performance of the heat exchange tube is influenced to be further improved.

The utility model has the following contents:

the present invention is directed to overcome the above-mentioned deficiencies of the prior art and to provide a double-sided reinforced pitted-surface corrugated condenser tube.

The utility model provides a technical scheme as follows: two sides are reinforceed pitted surface ripple condenser pipe, it includes the heat exchange tube, and the heat exchange tube constitutes its characterized in that as an organic whole by the smooth section at both ends and pitted surface ripple section: the outer surface of the corrugated section with the rough surface is densely provided with micro bulges, and the geometrical shapes of the top surfaces of the micro bulges are square or rectangular; four adjacent micro-bulges are arranged in a square or rectangular shape; the outer surface of the corrugated section with the rough surface is provided with a spiral channel, the spiral channel is continuous and penetrates through the corrugated section with the rough surface of the whole heat exchange tube, the surface between the adjacent channels is outwards protruded to form a curved surface, and the edge of the curved surface is connected with the channel.

Furthermore, the height of the micro-protrusions is 0.05-0.4 mm, the width is 0.1-0.3 mm, the length is 0.1-0.6 mm, and the arrangement density is 80-400/c m²。

Furthermore, the height of the micro-bumps is 0.3mm, the width is 0.15mm, the length is 0.6mm, and the arrangement density is 150 pieces/cm²。

Furthermore, the section of the spiral channel is a semicircular spiral channel, the depth is 0.3-0.8 mm, and the width of an upper opening is 0.6-2 mm; the distance between the channels is 4-20 mm, and an included angle between the channels and the axis is 40-85 degrees; the curvature radius R of the curved surface formed by the outward bulge of the surface between the adjacent channels is 0.6-1.5 times of the diameter of the heat exchange tube.

Further, the depth of the spiral channel is 0.5mm, and the width of the upper opening is 1.5 mm; the channel interval is 9mm, and the axis contained angle is 82 degrees.

Furthermore, the spiral ribs are formed on the inner surface of the pitted surface corrugated section corresponding to the spiral channel, and the height of the spiral ribs is 0.3-0.8 mm.

Furthermore, the height of the spiral rib formed on the inner surface of the pitted-surface corrugated section corresponding to the spiral channel is 0.5 mm.

Furthermore, the bottom wall thickness of the heat exchange tube is 0.4-1.5 mm.

The utility model has the advantages that:

the utility model discloses because miniature protrusion is arranged densely on the surface, compare greatly increased heat transfer area with smooth pipe, improved heat exchange efficiency. More importantly, according to the Wenzel theory, the contact angle between solid and liquid can be increased by forming the rough surface by the numerous micro-protrusions, so that the rough surface reaches the degree of hydrophobic surface and even super-hydrophobic, and further the condensation heat exchange effect is improved. Compare with the irregular rough surface of methods such as spraying manufacturing, the utility model discloses a machining produces miniature arch, and arranges into neat square or rectangle with miniature arch, forms regular rough surface. The advantages are that: the geometric dimension of the tiny bulges can be artificially regulated and controlled, and further the effect of optimizing the performance is achieved. According to the theoretical analysis of the interface physics and the corresponding experimental results, the method comprises the following steps: even if the roughness of the surface is the same, the contact angle and the droplet flow state under the surface topography of different roughness units will differ. Multiple tests prove that: compare with the rough surface of other appearances, the utility model discloses a regular rough surface under square/rectangle protruding appearance can obtain better coefficient of heat transfer. Additionally, the utility model discloses the surface still is equipped with the spiral channel, and its effect is many-sided: the outer surface of the heat exchange tube bulges outwards under the extrusion action of the adjacent channels to form a curved surface, condensed liquid is easy to drain to the channels on two sides along the curved surface, the thickness of a surface liquid film is reduced as soon as possible, and the condensation heat exchange coefficient is improved. On the other hand, the heat transfer coefficient of heat exchange tube is by outside of tubes heat transfer coefficient and intraductal heat transfer coefficient combined action decision, the utility model discloses during the spiral channel of processing surface, not only can accelerate the flowing back, it is corresponding, can also cause the heliciform protrusion of internal surface, form the spiral rib, when highly being greater than the thickness of the viscidity bottom of intraductal flow boundary layer of rib, can improve intraductal heat transfer coefficient. The heat exchange coefficient inside and outside the pipe is strengthened at the same time, and the improvement of the total heat transfer coefficient is ensured. The utility model discloses can improve the condensation heat transfer coefficient of heat exchange tube by a wide margin, can reach about 2 times of smooth pipe.

Description of the drawings:

fig. 1 is a schematic structural view of the present invention;

fig. 2 is a partially enlarged view of fig. 1.

The specific implementation mode is as follows: the following detailed description of embodiments of the invention refers to the accompanying drawings in which:

as shown in figures 1 and 2, the double-side strengthened pitted-surface corrugated condenser pipe is processed by using a stainless steel pipe 19 x 0.6 (materials such as copper, titanium, carbon steel and the like can also be used for processing), and comprises a heat exchange pipe 1, wherein the heat exchange pipe 1 is formed by integrally connecting a smooth section 2 and a pitted-surface corrugated section 3 at two endsThe outer surface of the pitted-surface corrugated section 3 is densely provided with micro protrusions 4, the top surfaces of the micro protrusions 4 are in a square or rectangular shape, the height of the micro protrusions 4 is 0.05-0.4 mm (preferably 0.3 mm), the width is 0.1-0.3 mm (preferably 0.15 mm), and the length is 0.1-0.6 mm (preferably 0.6 mm); the arrangement density is 80-400 pieces/cm²(preferably 150/cm)²). The plurality of micro-protrusions 4 are regularly arranged in rows (parallel axes) and columns (vertical axes), i.e. four adjacent micro-protrusions 4 are arranged in a square or rectangle. The outer surface of the corrugated section 3 with the rough surface is provided with a spiral channel 5, the spiral channel 5 is continuous and penetrates through the corrugated section 3 with the rough surface of the whole heat exchange tube, the section of the spiral channel 5 is a semicircular spiral channel, the depth is 0.3-0.8 mm (preferably 0.5 mm), and the width of an upper opening is 0.6-2 mm (preferably 1.5 mm); the channel interval is 4 ~ 20mm (9 mm is preferred), and is 40 ~ 85 degrees (82 degrees are preferred) with the axis contained angle. The surfaces between the adjacent spiral channels 5 are outwards convex to form a curved surface, the curvature radius R is 0.6-1.5 times of the diameter of the heat exchange tube 1, and the curvature radius R is preferably 18 mm; and the curved edge is connected with the spiral groove 5. The wall thickness of the bottom of the heat exchange tube is 0.4-1.5 mm, and the wall thickness of the heat exchange tube is thin, corresponding to the spiral channel 5 on the outer surface of the pitted-surface corrugated section 3, the inner surface of the pitted-surface corrugated section 3 is provided with corresponding spiral protrusions to form spiral ribs, and the height of the ribs is 0.3-0.8 mm (preferably 0.5 mm). By using the double-side strengthened pitted-surface corrugated condensation pipe processed by the method, the comprehensive heat transfer coefficient of the condensation heat exchange test under the R134a refrigerant reaches 2 times of that of a light pipe.

It should be understood that parts of the specification not set forth in detail are well within the prior art. The above description of the preferred embodiments is in great detail, but should not be construed as limiting the scope of the invention.

Claims (8)

1. Two sides are reinforceed pitted surface ripple condenser pipe, it includes heat exchange tube (1), and heat exchange tube (1) is even as an organic whole by smooth section (2) and pitted surface ripple section (3) at both ends and is constituted its characterized in that: the outer surface of the corrugated section (3) with the rough surface is densely provided with micro-bulges (4), and the top surfaces of the micro-bulges (4) are in a square or rectangular geometric shape; four adjacent micro-bulges (4) are arranged in a square or rectangular shape; the outer surface of the corrugated section (3) is provided with a spiral channel (5), the spiral channel (5) is continuous and penetrates through the corrugated section (3) of the whole heat exchange tube, the surface between the adjacent channels is outwards protruded to form a curved surface, and the edge of the curved surface is connected with the channels.

2. The double-sided reinforced pitted-surface corrugated condenser pipe of claim 1, wherein: the height of the micro-protrusions (4) is 0.05-0.4 mm, the width is 0.1-0.3 mm, the length is 0.1-0.6 mm, and the arrangement density is 80-400/c m²。

3. The double-sided reinforced pitted-surface corrugated condenser tube of claim 2, wherein: the height of the micro-protrusions (4) is 0.3mm, the width is 0.15mm, the length is 0.6mm, and the arrangement density is 150/cm²。

4. The double-sided reinforced pitted-surface corrugated condenser pipe of claim 1, wherein: the section of the spiral channel (5) is a semicircular spiral channel, the depth is 0.3-0.8 mm, and the width of an upper opening is 0.6-2 mm; the distance between the channels is 4-20 mm, and an included angle between the channels and the axis is 40-85 degrees; the curvature radius R of the curved surface formed by the outward bulge of the surface between the adjacent channels is 0.6-1.5 times of the diameter of the heat exchange tube (1).

5. The double-sided reinforced pitted-surface corrugated condenser pipe of claim 4, wherein: the depth of the spiral channel (5) is 0.5mm, and the width of the upper opening is 1.5 mm; the channel interval is 9mm, and the axis contained angle is 82 degrees.

6. The double-sided reinforced pitted-surface corrugated condenser pipe of claim 1, wherein: the height of a spiral rib formed on the inner surface of the hemp surface corrugated section (3) corresponding to the spiral channel (5) is 0.3-0.8 mm.

7. The double-sided reinforced pitted-surface corrugated condenser pipe of claim 6, wherein: the height of the spiral rib formed on the inner surface of the hemp surface corrugated section (3) corresponding to the spiral channel (5) is 0.5 mm.

8. The double-sided reinforced pitted-surface corrugated condenser tube of claim 1, wherein: the bottom wall thickness of the heat exchange tube (1) is 0.4-1.5 mm.

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