CN210718220U

CN210718220U - Heat exchange tube for flooded evaporator

Info

Publication number: CN210718220U
Application number: CN201921189297.5U
Authority: CN
Inventors: 金莉雯; 张春明; 张东方; 张国锋
Original assignee: Jiangsu Cuilong Precision Copper Tube Corp
Current assignee: Jiangsu Cuilong Precision Copper Tube Corp
Priority date: 2019-07-26
Filing date: 2019-07-26
Publication date: 2020-06-09
Anticipated expiration: 2029-07-26

Abstract

A heat exchange tube for a flooded evaporator belongs to the technical field of evaporative heat exchange tubes in air conditioners and refrigeration systems. The heat exchanger comprises a pipe body and outer fins extending spirally on the outer wall of the pipe body, wherein a communicated cavity structure is formed by gaps between every two adjacent spiral outer fins; the outer fins comprise upper half outer fins and lower half outer fins which are respectively arranged on two opposite sides in the radial direction of the tube body; the cavity structure and the cavity opening formed between the outer fins of the upper half part are smaller, and the cavity structure and the cavity opening formed between the outer fins of the lower half part are larger. The advantages are that: the structure is favorable for forming bubbles, and the bubbles are easily discharged from the cavity and float, so that the boiling heat exchange process of the heat exchange tube is further strengthened, and the overall heat exchange efficiency of the heat exchange tube is effectively improved.

Description

Heat exchange tube for flooded evaporator

Technical Field

The utility model belongs to the technical field of the evaporation heat exchange tube among air conditioner, the refrigerating system, concretely relates to heat exchange tube for flooded evaporator.

Background

Studies on boiling heat transfer mechanisms have shown that boiling of liquids requires the presence of a core of vaporization. Given the degree of superheat of the heating surface, the bubble grows and nucleate boiling proceeds only when the radius of the vaporization core is greater than the minimum radius required for bubble growth. And the cavity formed by the grooves on the heated surface is most likely to be the core of vaporization. In the boiling process, after the bubbles grow and are separated from the cavities, the active cavities can intercept part of steam due to the action of the surface tension of the liquid, become a new vaporization core and grow new bubbles, so that the boiling process is continuously continued. If the cavity is too shallow or too large, when the bubble is removed from the cavity, the cavity is completely occupied by liquid, the cavity loses activity, no bubble is generated, and the boiling heat exchange is weakened. Much of the development work on enhanced boiling heat transfer surfaces since the 70's of the 20 th century has been around the formation of porous structures on heating surfaces. For full liquid evaporation, the reasonable arrangement of the cavity structure plays a crucial role in enhancing heat transfer, the cavity structure of the heat exchange tube is beneficial to generating bubbles, the bubbles can freely float and be discharged out of the surface of the liquid, a continuous boiling heat exchange process is formed, and therefore the heat exchange performance of the heat exchange tube is improved.

The heat exchange tube for the evaporator disclosed in chinese patents 95246323.7 and 10135786.7 has an outer surface with a top portion pressed with a T-shaped helical fin to form a cavity structure with a slightly smaller opening to construct a place for forming a vaporization core, thereby achieving an enhanced boiling heat exchange effect. However, the above heat exchange tube has the following problems: because the whole cavity structure of the heat exchange tube is consistent, when the heat exchange tube is in a working state, bubbles generated by the cavity structure of the upper half part of the heat exchange tube are easily floated upwards under the action of buoyancy and the liquid surface is removed to form boiling heat exchange, and because the cavity structure of the lower half part of the heat exchange tube is downward in the opening of the cavity, the bubbles generated by the cavity are influenced by the buoyancy and are not easy to discharge, so that the heat exchange effect is poor.

In view of the above-mentioned prior art, the applicant has made an advantageous design, and the technical solutions described below have been made in this context.

Disclosure of Invention

The utility model aims at providing a heat exchange tube for flooded evaporator to the defect of prior art.

The utility model aims at achieving the purpose, the heat exchange tube for the flooded evaporator comprises a tube body with an inner cavity and outer fins extending spirally on the outer wall of the tube body, wherein gaps among the outer fins form a communicated cavity structure, and fin grooves which are staggered and communicated with the cavity structure are processed on the outer fins; the outer fins comprise upper half outer fins and lower half outer fins which are respectively arranged on two opposite sides in the radial direction of the tube body; the inner surface of the pipe body is convexly provided with inner teeth which are of an integrated structure with the pipe body.

In a further preferable structure, the heat exchange tube for the flooded evaporator is horizontally arranged in the use process, and the upper half part of the outer fin is positioned right above the lower half part of the outer fin.

In a further preferable structure, the height of the outer fin is 0.5-1.2 mm.

Further preferred structure, the degree of depth of wing groove is 0.2 ~ 0.4mm, and circumference wing groove quantity is 65 ~ 175, and is 1 ~ 50 with the axis contained angle.

In a further preferred structure, the number of the cavity structures formed between the upper half part outer fins is 40-60 per inch, and the cavity opening width P1 is 0.1-0.2 mm.

In a further preferred structure, the number of the cavity structures formed between the lower half outer fins is 25-35 per inch, and the cavity opening width P2 is 0.25-0.4 mm.

Further preferred structure, the height of internal tooth is 0.25 ~ 0.45 mm, and circumference internal thread rib quantity is 20 ~ 50, and helix angle is 30 ~ 60.

The utility model has the advantages that: the outer fins of the heat exchange tube are arranged into an upper half part outer fin and a lower half part outer fin on two radial opposite sides, a cavity structure and a cavity opening formed between the upper half part outer fins are small, and a cavity structure and a cavity opening formed between the lower half part outer fins are large. The upper half part of the outer fins form a relatively dense and small cavity structure, so that on one hand, the surface area of the heat exchange outside the tube is increased as much as possible, and on the other hand, as many vaporization cores as possible are formed, thereby enhancing the boiling heat exchange outside the tube; the outer fin of the lower half part forms a relatively sparse and large cavity structure, so that an optimized vaporization core is favorably formed, bubbles are easily generated and float upwards after being discharged from a cavity opening, and the boiling process can be continuously carried out, so that the boiling heat exchange of the heat exchange tube is further strengthened, and the overall heat exchange efficiency of the heat exchange tube is effectively improved.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic structural view of the upper half outer fin of the present invention;

FIG. 3 is a schematic structural view of the outer fins on the lower half part of the present invention;

FIG. 4 is a schematic view of the surface of the upper part of the outer fin of the present invention;

FIG. 5 is a schematic view of the surface of the outer fin of the lower half of the present invention;

in the figure: the structure comprises 1-tube body, 2-external fins (21-upper half external fins, 22-lower half external fins), 3-cavity structure, 4-fin groove and 5-internal teeth.

Detailed Description

The technical practice and advantages of the present invention will be further clarified by the following description with reference to the accompanying drawings and specific examples, but the description of the embodiments is not intended to limit the technical solutions of the present invention, and any equivalent changes in form and insubstantial changes made according to the inventive concept should be considered as the technical solution of the present invention.

Fig. 1 to 5 show a specific embodiment of a heat exchange tube for a flooded evaporator of the present invention, in the present preferred embodiment, the heat exchange tube comprises a tube body 1 having an inner cavity and outer fins 2 extending in a spiral shape on the outer wall of the tube body 1, gaps between the outer fins 2 form communicating cavity structures 3, and fin grooves 4 are processed on the outer fins 2, which are both staggered and communicated with the cavity structures 3; the outer fins 2 comprise upper half outer fins 21 and lower half outer fins 22 which are respectively arranged on two opposite sides of the pipe body 1 in the radial direction; the inner surface of the pipe body 1 is convexly provided with inner teeth 5 which are of an integrated structure with the pipe body 1.

In the preferred embodiment, the heat exchange tube for the flooded evaporator should be in a horizontal arrangement state during use, and the upper half outer fin 21 is located right above the lower half outer fin 22; the height of the outer fin 2 is 0.9 mm; the depth of the fin grooves 4 is 0.3mm, the number of the circumferential fin grooves is 102, and an included angle between the circumferential fin grooves and an axis is 40 degrees; the number of the cavity structures 3 formed between the upper half part of the outer fins 21 is 50 per inch, and the opening width P1 of the cavity is 0.15mm, so that the smaller cavity structure formed by the structure increases the surface area of heat exchange outside the tube as much as possible, and forms a vaporization core as much as possible, thereby strengthening the boiling heat exchange outside the tube; the number of the cavity structures 3 formed between the outer fins 22 of the lower half part is 30 per inch, and the opening width P2 of the cavity is 0.3mm, so that a large cavity structure formed by the structure is beneficial to forming a vaporization core, is easy to generate bubbles and is discharged from the opening of the cavity to float upwards, so that the boiling process can be continuously carried out, and the boiling heat exchange of the heat exchange tube is enhanced; the height of the internal teeth 5 is 0.38 mm, the number of circumferential internal thread ribs is 34, and the spiral angle is 43 degrees.

To sum up, the technical scheme provided by the utility model makes up the shortages and deficiencies in the prior art, completes the invention task, and realizes the technical effects described in the technical effect column by the applicant, and the technical scheme is an ultimate technical scheme.

Claims

1. The utility model provides a heat exchange tube for flooded evaporator, is including body (1) that has the inner chamber and outer fin (2) with the heliciform extension on body (1) outer wall which characterized in that: gaps among the outer fins (2) form communicated cavity structures (3), and fin grooves (4) which are staggered and communicated with the cavity structures (3) are processed on the outer fins (2); the outer fins (2) comprise upper half outer fins (21) and lower half outer fins (22) which are respectively arranged on two opposite sides in the radial direction of the tube body (1); the inner surface of the pipe body (1) is convexly provided with inner teeth (5) which are integrated with the pipe body (1).

2. A heat exchange tube for a flooded evaporator as recited in claim 1, wherein: the heat exchange tube for the flooded evaporator is horizontally arranged in the using process, and the upper half part outer fin (21) is positioned right above the lower half part outer fin (22).

3. A heat exchange tube for a flooded evaporator as recited in claim 1, wherein: the height of the outer fin (2) is 0.5-1.2 mm.

4. A heat exchange tube for a flooded evaporator as recited in claim 1, wherein: the depth of the fin grooves (4) is 0.2-0.4 mm, the number of the circumferential fin grooves is 65-175, and the included angle between the circumferential fin grooves and the axis is 1-50 degrees.

5. A heat exchange tube for a flooded evaporator as recited in claim 1, wherein: the number of the cavity structures (3) formed between the upper half part of the outer fins (21) is 40-60 per inch, and the opening width P1 of the cavity is 0.1-0.2 mm.

6. A heat exchange tube for a flooded evaporator as recited in claim 1, wherein: the number of the cavity structures (3) formed between the lower half outer fins (22) is 25-35 per inch, and the opening width P2 of the cavities is 0.25-0.4 mm.

7. A heat exchange tube for a flooded evaporator as recited in claim 1, wherein: the height of internal tooth (5) is 0.25 ~ 0.45 mm, and circumference internal thread rib quantity is 20 ~ 50, and helix angle is 30 ~ 60.