CN110425774A - A kind of compound hole evaporating heat-exchanging pipe - Google Patents

Abstract

A composite cavity evaporation heat exchange tube, including a tube body and a spiral outer fin integrally structured with the tube body, one side of the outer fin is provided with a secondary lateral fin, and the top of the outer fin is processed to form an inclined shape, and The direction of inclination is consistent with the extension direction of the secondary lateral fins, forming F-shaped outer fins, and the gaps between the outer fins form a connected composite spiral channel, and the spiral channel is also processed on the F-shaped outer fins. The staggered and connected fin grooves and the spiral channel are divided into multiple composite hole structures, and internal thread ribs are protruded on the inner surface of the tube. Advantages: The composite annular channel formed by the gap between the F-shaped outer fins provides a large number of vaporization cores, and is conducive to the rapid growth and overflow of bubbles. At the same time, the composite hole structure is conducive to the flow of refrigerant into the hole during the evaporation heat exchange process, ensuring The timely replenishment of refrigerant and the effective discharge of steam make the boiling process continue continuously, thereby achieving the effect of enhancing boiling heat transfer.

Description

A Composite Hole Evaporation Heat Exchange Tube

technical field

The invention belongs to the technical field of evaporative heat exchange tubes in air conditioning and refrigeration systems, and in particular relates to a compound hole evaporative heat exchange tube.

Background technique

The evaporative heat exchanger is an essential component in the central air-conditioning system, and the evaporator tube is the core component of the evaporative heat exchanger, and its heat transfer performance determines the performance of the evaporative heat exchanger. For the heat exchange tube manufacturing industry, improving the energy efficiency of refrigeration and air conditioning equipment is mainly achieved by improving the heat exchange efficiency of the heat exchange tube. The evaporator tubes used in refrigeration and air-conditioning systems have relatively large boiling heat transfer resistance and forced convection heat transfer heat transfer resistance when the refrigerant boils outside the tube. Therefore, by optimizing the fin structure outside the tube and enhancing the boiling heat transfer outside the tube, the heat transfer efficiency of the evaporation tube can be effectively improved.

In the prior art, the shape of the outer fins is usually processed into a T shape. Traditional T-shaped fins are easy to process, so they are widely used. For example, the "evaporator heat transfer tube" disclosed in Chinese patent 10135786.7 and the "heat exchange tube for evaporator" disclosed in Chinese patent 20297489.5 are all T-shaped fins, and the gap between the fins forms a hole structure, making it a The vaporization core required by the refrigerant to form bubbles, so as to achieve the effect of boiling heat exchange. However, the processing process of T-shaped fins is to use blades to flatten the vertical outer fins from the top. During the pressing process, the vertical fins subjected to pressure may be bent and deformed, resulting in irregular shapes of T-shaped fins and a cavity structure. The size is not uniform, which affects the heat transfer performance of the evaporator tube.

In view of the above prior art, the applicant has made a beneficial design, and the technical solution to be introduced below is produced under this background.

Contents of the invention

The object of the present invention is to provide a compound hole evaporation heat exchange tube aiming at the defects of the prior art.

The object of the present invention is achieved in this way, a compound hole evaporation heat exchange tube, including a tube body and a spiral outer fin formed by extending the material on the tube body, which is integral with the tube body, the outer fin One side of the sheet is provided with a secondary lateral fin, and the top of the outer fin is formed into an inclined shape by blade processing to form an F-shaped outer fin, and the gap between the F-shaped outer fins forms a composite spiral channel connected to each other. The F-shaped outer fins are also processed with fin grooves that are both staggered and connected with the spiral passages, and the F-shaped outer fins on the circumference are penetrated and divided, so that the spiral passages are divided by fin grooves to form multiple composites. Hole structure, the internal surface of the tube is protrudingly provided with internal thread ribs which are integrated with the tube body.

In a further preferred structure, the secondary lateral fins are located on any side of the outer fins.

In a further preferred structure, the inclined direction of the fins is consistent with the extension direction of the secondary lateral fins, forming an F-shaped outer fin.

In a further preferred structure, the pitch P of the fins is 0.4-1.5 mm.

In a further preferred structure, the inclination angle α of the fins is 60-90°.

In a further preferred structure, the included angle β between the secondary lateral fin and the fin is 60° to 90°.

In a further preferred structure, the height H of the F-shaped outer fins is 0.4-1.0 mm.

In a further preferred structure, the height h of the secondary lateral fins is 0.2-0.6 mm.

In a further preferred structure, the cross-sectional profile of the fin groove includes a rectangle, an inverted trapezoid and an inverted triangle.

In a further preferred structure, the angle γ between the fin groove and the axis is 1-60°, the groove depth is 0.3-1.0 mm, and the number of fin grooves in the circumferential direction is 60-180.

In a further preferred structure, the height of the internal thread rib is 0.3-0.6 mm, the number of internal thread ribs in the circumferential direction is 20-60, and the helix angle is 10-70°.

The invention makes the vertical outer fins with secondary lateral fins form an F-shaped structure through the lateral tilting of the blades on the vertical outer fins, and the lateral tilting of the blades on the vertical fins effectively avoids the processing process. The bending deformation of the middle fins makes the hole structure formed between the fins uniform and consistent, ensuring the stability of the evaporation heat transfer process. In addition, the secondary lateral fin structure on the outer fin makes the single cavity structure between the fins into a composite cavity structure, which further increases the vaporization core when the refrigerant evaporates, and the composite cavity structure is conducive to the rapid growth of bubbles formed by evaporation. Large and rapid overflow, so that the boiling process continues to achieve the effect of strengthening the boiling heat transfer of the evaporation tube.

Description of drawings

Fig. 1 is the structural representation of the first embodiment of the present invention;

Fig. 2 is another perspective schematic view of the first embodiment of the present invention;

Fig. 3 is a sectional view of the first embodiment of the present invention;

Fig. 4 is the top view of the first embodiment of the present invention;

5 is a schematic structural view of a second embodiment of the present invention;

Fig. 6 is another perspective schematic view of the second embodiment of the present invention;

Fig. 7 is the sectional view of the second embodiment of the present invention;

Fig. 8 is a top view of the second embodiment of the present invention.

In the figure: 1—pipe body, 2—F type outer fin (21—outer fin, 22—secondary lateral outer fin), 3—spiral channel, 4—fin groove, 5—internal thread rib.

Detailed ways

The technical practice and beneficial effects of the present invention will be further clarified below in conjunction with the accompanying drawings and specific embodiments, but the description of the embodiments is not a limitation to the solution of the present invention, and any formal and non-essential modifications made according to the concept of the present invention All equivalent changes should be regarded as the scope of the technical solution of the present invention.

Example 1:

Referring to Fig. 1 and Fig. 2, it shows a schematic structural view of a first embodiment of a composite cavity evaporation heat exchange tube of the present invention. In this preferred embodiment, the heat exchange tube includes a tube body 1 with an inner cavity, so The outer surface of the tube body 1 is provided with an outer fin 21 that is integrally structured with the tube body 1 and is distributed in a spiral shape, and a secondary lateral fin 22 is arranged on one side of the outer fin 21. The structure formed by this structure The composite fins make the single cavity structure between the fins a composite cavity structure, which further increases the vaporization core when the refrigerant evaporates; Consistent with the extension direction of the secondary lateral fins 22, it is inclined to the left, thereby forming F-shaped outer fins 2, the pitch P of the fins 21 is 0.55mm, and the inclination angle α is 75°. The lateral fins 22 and the fins The included angle β of the sheet 21 is 70°, the height h of the secondary lateral fin 22 is 0.4 mm, and the height H of the outer fin 2 is 0.7 mm. The F-shaped outer fin formed by this structure effectively avoids the processing process. The middle fins are bent and deformed, so that the cavity structure formed between the fins is uniform, ensuring the stability of the evaporation heat transfer process; as shown in Figure 4, the gaps between the F-shaped outer fins 2 form an interconnected compound The spiral channel 3 is also processed with fin grooves 4 interlaced and connected with the spiral channel 3 on the F-shaped outer fin 2, which penetrates and divides the F-shaped outer fin 2 on the circumference, so that the spiral channel 3 is covered by fins. The groove 4 is divided to form multiple composite cavity structures. The angle γ between the fin groove 4 and the axis is 40°, the groove depth is 0.5 mm, and the number of circumferential fin grooves is 130. The cross-sectional profile of the fin groove 4 is an inverted trapezoid. The composite hole structure formed by the structure is conducive to the rapid growth and overflow of the bubbles formed by evaporation, so that the boiling process continues to achieve the effect of strengthening the boiling heat transfer of the evaporation tube; Internally threaded ribs 5 with an integrated structure, the height of the internally threaded ribs 5 is 0.41 mm, the number of internally threaded ribs in the circumferential direction is 38, and the helix angle is 60°.

Example 2:

Referring to Fig. 5 and Fig. 6, it shows a schematic structural view of the second embodiment of a composite hole evaporation heat exchange tube according to the present invention. In this preferred embodiment, its basic structure and principle are the same as those of the first embodiment, but different It is: as shown in Fig. 7 and Fig. 8, the inclination direction of the fins 21 of the heat exchange tube is consistent with the extension direction of the secondary lateral fins 22 and inclines to the right; the inclination angle α of the fins 21 is 89° °; the angle β between the secondary lateral fin 22 and the fin 21 is 89°.

To sum up, the technical solution provided by the present invention makes up for the deficiencies and deficiencies in the prior art, completes the task of the invention, and realizes the technical effect described by the applicant in the technical effect column above, which is an ultimate technical solution.

Claims (11)

1. A compound cavity evaporation heat exchange tube, characterized in that: it includes a tube body (1) with an inner cavity, and the outer surface of the tube body (1) is provided with spirally distributed holes integrated with the tube body (1). The outer fin (21) of the structure is provided with a secondary lateral fin (22) on one side of the outer fin (21), and the top of the outer fin (21) is formed into an inclined shape by blade processing, forming an F type outer fins (2), the gaps between the F-type outer fins (2) form a composite spiral channel (3) connected to each other, and the F-type outer fins (2) are also processed with the The above-mentioned spiral channel (3) is staggered and connected fin grooves (4), and the F-shaped outer fins (2) on the circumference are penetrated and divided, so that the spiral channel (3) is divided by the fin grooves (4) to form multiple A compound hole structure, the inner surface of the pipe body (1) is protruded with an internal thread rib (5) integral with the pipe body (1). 2. The composite cavity evaporative heat exchange tube according to claim 1, characterized in that: the secondary lateral fins (22) are located on any side of the outer fins (21). 3. The composite hole evaporation heat exchange tube according to claim 1, characterized in that: the inclined direction of the fins (21) is consistent with the extension direction of the secondary lateral fins (22), forming an F-shaped Outer fins (2). 4. The composite cavity evaporation heat exchange tube according to claim 1, characterized in that: the pitch P of the fins (21) is 0.4-1.5 mm. 5 . The composite cavity evaporation heat exchange tube according to claim 1 , characterized in that: the inclination angle α of the fins ( 21 ) is 60-90°. 6 . The composite cavity evaporation heat exchange tube according to claim 2 , characterized in that: the included angle β between the secondary lateral fin ( 22 ) and the fin ( 21 ) is 60° to 90°. 7. The composite cavity evaporation heat exchange tube according to claim 3, characterized in that: the height H of the F-shaped outer fins (2) is 0.4-1.0 mm. 8. The composite cavity evaporation heat exchange tube according to claim 2, characterized in that: the height h of the secondary lateral fins (22) is 0.2-0.6 mm. 9. The composite cavity evaporative heat exchange tube according to claim 1, characterized in that: the cross-sectional profile of the fin groove (4) includes rectangle, inverted trapezoid and inverted triangle. 10. The composite hole evaporation heat exchange tube according to claim 1, characterized in that: the angle γ between the fin groove (4) and the axis is 1-60°, the groove depth is 0.3-1.0 mm, and the circumferential The number of fin slots is 60-180. 11. A composite cavity evaporation heat exchange tube according to claim 1, characterized in that: the height of the internal thread rib (5) is 0.3-0.6mm, and the number of circumferential internal thread ribs is 20-60, The helix angle is 10-70°.