阅读说明：本技术 一种对穿涡流发生器及具有对穿涡流发生器的换热管 (To wearing vortex generator and having heat exchange tube to wearing vortex generator ) 是由 付婷 王江波 王海均 于 2021-08-31 设计创作，主要内容包括：本发明公开了一种对穿涡流发生器,包括中心杆,所述中心杆上布置有二根以上的小翼,所述小翼和中心杆存在夹角,且所有小翼和中心杆同一侧的夹角均小于90°,小翼自由端部设有凹口。本发明还公开了一种具有对穿涡流发生器的换热管。本发明中的对穿涡流发生器通过倾斜放置的翼型结构引导管道中心处的涡流引流至壁面处,靠近壁面处的凹口再产生射流,通过这两股流体进入对穿涡流发生器后侧回流区,进而提高回流区的速度,达到减小传热恶化区域和提高传热效率的目的。(The invention discloses a through vortex generator which comprises a central rod, wherein more than two winglets are arranged on the central rod, included angles exist between the winglets and the central rod, the included angles of all the winglets and the same side of the central rod are smaller than 90 degrees, and a notch is formed in the free end part of each winglet. The invention also discloses a heat exchange tube with the opposite-penetrating vortex generator. The through vortex generator guides vortex at the center of the pipeline to flow to the wall surface through the obliquely arranged wing-shaped structure, the notch close to the wall surface generates jet flow, and the two flows enter the backflow area at the rear side of the through vortex generator, so that the speed of the backflow area is increased, and the purposes of reducing a heat transfer deterioration area and improving heat transfer efficiency are achieved.)

1. The utility model provides a to wearing vortex generator which characterized in that, includes well core rod, the winglet more than two has been arranged on well core rod, winglet and core rod have the contained angle, and all winglets and core rod all are less than 90 with the contained angle of one side, and the winglet free end is equipped with the notch.

2. The generator of claim 1, wherein the winglets are triangular in configuration, the sharp corners of the winglets being located at the central rod, the sharp corners of the winglets being provided with connecting sections for connection to the central rod.

3. The through-vortex generator of claim 1 wherein the winglet and the same side of the central rod are angled equally.

4. The through-vortex generator of claim 1 wherein the connection points of the winglets and the central rod are located at the same cross-section of the central rod.

5. The through-vortex generator of claim 1 wherein the winglets are equally spaced circumferentially along the central rod.

6. The through-vortex generator of claim 1 wherein the notch is rectangular in shape.

7. A heat exchange tube with the through vortex generators as claimed in any one of claims 1 to 6, which comprises a tube body, wherein a plurality of pairs of through vortex generators are arranged in the tube body, and the central rod of each through vortex generator and the tube body are coaxially arranged; one end of the pipe body is an inlet end, the other end of the pipe body is an outlet end, an included angle between the winglet and the central rod on the side where the outlet end is located is smaller than 90 degrees, and the free end of the winglet abuts against the pipe body.

8. The heat exchange tube with through vortex generators as claimed in claim 7, wherein the distance between the through vortex generator nearest to the inlet end of the tube body and the inlet end of the tube body is 20-40 times the diameter of the tube body, and the distance between the through vortex generator nearest to the outlet end of the tube body is not less than 100 mm.

9. The heat exchange tube with through-vortex generators of claim 7, wherein the spacing between two adjacent sets of through-vortex generators is 2 times the diameter of the tube body.

10. The heat exchange tube with cross-over vortex generators of claim 7 wherein the winglet free end portion is fully flush with and connected to the body sidewall.

Technical Field

The invention relates to the field of heat exchange tubes, in particular to a through vortex generator and a heat exchange tube with the through vortex generator.

Background

Vortex generators are widely used in heat exchange equipment as a simple and effective heat exchange enhancement device. The heat exchange methods commonly used include an active method, a passive method and a mixed method. The passive method is widely used in industry because of its simple structure. The vortex generator is used as a simple reinforced heat exchange mechanism, and has the advantages of simple manufacturing process, stable performance and the like, so that the vortex generator is widely applied to a plurality of passive heat exchange devices. Meanwhile, as is well known, the vortex generator can play an important role in inducing multiple longitudinal vortexes in the liquid flowing process, so as to effectively destroy and reduce the thickness of a thermal boundary layer. Furthermore, any slight variation in the shape, position and angle of attack of the vortex generators will produce a different flow field.

Disclosure of Invention

It is an object of the present invention to provide a through vortex generator.

The invention also provides a heat exchange tube with the opposite-penetrating vortex generator.

The invention has the innovation points that the cross-flow vortex generator guides the vortex at the center of the pipeline to be drained to the wall surface through the obliquely arranged wing-shaped structure, the notch close to the wall surface generates jet flow, and the two flows enter the backflow area at the rear side of the cross-flow vortex generator, so that the speed of the backflow area is improved, and the purposes of reducing the heat transfer deterioration area and improving the heat transfer efficiency are achieved.

In order to achieve the purpose, the technical scheme of the invention is as follows: the utility model provides a to wearing vortex generator, includes well core rod, the winglet more than two has been arranged on well core rod, winglet and core rod have the contained angle, and all winglets and core rod all are less than 90 with the contained angle of one side, and the winglet free end portion is equipped with the notch.

Furthermore, the winglet is of a triangular structure, the sharp corner of the winglet is located at the central rod, and the sharp corner of the winglet is provided with a connecting section connected with the central rod. The larger the projected area of the through vortex generators and the pipe body is in the central area of the pipe body, the larger the resistance is formed, and therefore, the area of the through vortex generators in the central area of the pipe body is relatively smaller. However, in order to make the vortex in the central area of the pipe body flow to the wall surface area under the guiding action of the opposite-passing vortex generator, the opposite-passing vortex generator with a certain area is required to guide the fluid, so that the area of the opposite-passing vortex generator gradually increases from the center of the pipeline to the pipe wall, and the winglet is in an optimal triangular structure.

Further, the winglets and the central rod are angled at equal angles on the same side. The heat exchange around the tube body is more uniform.

Further, the connection points of the winglets and the central rod are located at the same section of the central rod. The heat exchange in the length direction of the pipe body is more uniform.

Further, the winglets are arranged at equal intervals in the circumferential direction of the central rod. The heat exchange around the tube body is more uniform.

Further, the notch is rectangular.

A heat exchange tube with opposite-penetrating vortex generators comprises a tube body, wherein a plurality of pairs of opposite-penetrating vortex generators are arranged in the tube body, and central rods of the opposite-penetrating vortex generators and the tube body are coaxially arranged; one end of the pipe body is an inlet end, the other end of the pipe body is an outlet end, an included angle between the winglet and the central rod on the side where the outlet end is located is smaller than 90 degrees, and the free end of the winglet abuts against the pipe body.

Further, the distance between the opposite-penetrating vortex generator nearest to the inlet end of the pipe body and the inlet end of the pipe body is 20-40 times of the diameter of the pipe body, and the distance between the opposite-penetrating vortex generator nearest to the outlet end of the pipe body is larger than or equal to 100 mm. The distance from the inlet end is such as to place the contra-vortex generator in a position where there is sufficient fluid flow and the distance from the outlet end is such as to prevent back flow of the vortex.

Further, the distance between two adjacent groups of opposite-penetrating vortex generators is 2 times of the diameter of the pipe body. The heat exchange efficiency is optimal at the moment.

Further, the winglet free end portion is in full abutment with and connected to the body side wall. The tension of the winglet can be used to fix the through vortex generator when the flow rate is low, but the winglet needs to be glued or welded to the side wall of the pipe body when the flow rate is high.

The invention has the beneficial effects that:

1. when the fluid flows through the opposite-through vortex generator, the fluid forms a vortex on the rear side of the opposite-through vortex generator due to the pressure difference between the front side and the rear side of the opposite-through vortex generator. The fluid generates a vortex in the central area of the pipe body, and the vortex continuously moves along the opposite-passing vortex generator; eddy current is generated near the wall surface, and fluid can form jet flow after flowing through the notch; the vortex generated in the central area and the jet generated by the notch impact the backflow area passing through the rear side of the vortex generator together, so that the flow resistance is reduced, the speed of the backflow area is increased, and the purposes of reducing the heat transfer deterioration area and improving the heat transfer efficiency are achieved.

Drawings

Fig. 1 is a schematic structural view of a through vortex generator in embodiment 1.

Fig. 2 is a schematic view of a winglet.

Fig. 3 is a schematic structural view of a heat exchange tube in example 2.

FIG. 4 is a graph showing the correlation between the heat transfer efficiency and the Reynolds number when L takes different values and the notch areas are different in example 3.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

Example 1: as shown in fig. 1 and 2, the through-vortex generator comprises a central rod 1.1, wherein more than two winglets 1.2 are arranged on the central rod 1.1, and the winglets 1.2 are arranged at equal intervals along the circumferential direction of the central rod 1.1. The winglet 1.2 is of a triangular structure, the sharp angle of the winglet 1.2 is positioned at the central rod 1.1, the sharp angle of the winglet 1.2 is provided with a connecting section 1.4 connected with the central rod 1.1, and the connecting point of the winglet 1.2 and the central rod 1.1 is positioned at the same section of the central rod 1. The winglets 1.2 are angled with respect to the central rod 1.1 and all winglets 1.2 are angled with respect to the same side of the central rod 1.1 by less than 90, preferably by equal angles with respect to the winglets 1.2 and the same side of the central rod 1.1. The free end of the winglet 1.2 is provided with a notch 1.3, and the notch 1.3 is rectangular.

Example 2: as shown in fig. 3 and 4, a heat exchange tube with opposite-penetrating vortex generators comprises a tube body 2, wherein a plurality of groups of opposite-penetrating vortex generators 1 are arranged in the tube body 2, the opposite-penetrating vortex generators 1 are coaxially arranged with the tube body 2, and the distance between every two adjacent groups of opposite-penetrating vortex generators 1 is 2 times the diameter of the tube body 2.2 one end of body is entrance point 2.1, one end is exit end 2.2, winglet 1.2 and exit end 2.2 place the side central rod 1.1's contained angle be less than 90, winglet 1.2's free end butt is on body 2, winglet 1.2 free end and 2 lateral walls of body laminate completely and are connected with 2 lateral walls of body. The distance between the opposite-penetrating vortex generator 1 nearest to the inlet end of the pipe body and the inlet end of the pipe body 2 is 20-40 times of the diameter of the pipe body 2, and the distance between the opposite-penetrating vortex generator 1 nearest to the outlet end of the pipe body 2 is not less than 100 mm.

Example 3: referring to example 2, the distance between the nearest penetrating vortex generator 1 and the inlet end of the pipe body 2 from the inlet end of the pipe body is 40 times of the diameter of the pipe body 2, the distance between the nearest penetrating vortex generator 1 and the outlet end of the pipe body 2 is 100mm, and the distance between two adjacent pairs of penetrating vortex generators 1 is L.

The described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.