Rotary inclined concave-convex groove expansion head assembly

Abstract

The utility model belongs to the technical field of heat exchanger expansion head assemblies, and particularly relates to a rotary inclined concave-convex groove expansion head assembly which comprises an expansion rod, an expansion head and an expansion head fixing cap, a plurality of concave-convex grooves are formed in the contact face of the expansion head and the inner wall of a pipe, the concave-convex grooves and the axial direction of the expansion head are arranged in an inclined mode, and the expansion head fixing cap is fixedly connected with the expansion rod. According to the rotary inclined concave-convex groove expansion head assembly, when the expansion head assembly of the structure is used for pipe expansion, the inner wall of a copper pipe can be in a threaded concave-convex shape, the internal heat exchange area of the copper pipe can be effectively increased, meanwhile, water flow disturbance can be promoted, and the heat exchange efficiency of the copper pipe can be improved. Therefore, the heat exchange coefficient is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchanger expansion head components, in particular to a rotating oblique concave-convex groove expansion head component. Background Art

[0002] Common surface heat exchangers using water as the refrigerant are mostly constructed with copper tubes inserted through aluminum foil fins, with the copper tubes and aluminum foil fins brought into close contact via mechanical tube expansion equipment (principle: the mechanical tube expansion equipment is equipped with several corresponding expansion head assemblies, which include an expansion rod, an expansion head, and an expansion head fixing cap. During operation, the expansion head is pushed into the inner cavity of the copper tube by the expansion rod, causing the copper tube to expand outward. The outer wall of the copper tube is tightly squeezed against the perforations of the aluminum foil fins to ensure good thermal conductivity).

[0003] There are currently two ways to improve heat transfer efficiency. One is to increase the heat transfer coefficient on the outside of the tube, such as using hydrophilic aluminum foil, perforating the foil, flanging it twice, rolling the foil into corrugated sheets, and punching seams. The other is to improve the heat transfer coefficient on the inside of the tube, such as increasing the heat transfer area on the inner wall of the tube and increasing water disturbance.

[0004] At present, the heat exchanger tube expansion equipment adopts a conventional expansion head assembly, which includes an expansion rod, an expansion head and an expansion head fixing cap. The expansion head is a truncated cone structure with a through hole in the middle. The lower end of the expansion rod has an internal thread, and the flat end of the expansion head fixing cap has a straight rod, and the end of the straight rod has an external thread. The straight rod of the expansion head fixing cap passes through the middle through hole of the expansion head and is fixed in the internal thread at the lower end of the expansion rod. This type of expansion head assembly can only expand the diameter of the copper tube after tube expansion, and the heat exchange coefficient on the inside of the tube is limitedly improved. Utility Model Content

[0005] The utility model provides a rotating oblique concave-convex groove expansion head component, which can solve the problems pointed out in the background technology.

[0006] A rotating oblique concave-convex groove expanding head assembly includes an expanding rod, an expanding head and an expanding head fixing cap. A plurality of concave-convex grooves are provided on the contact surface between the expanding head and the inner wall of the tube. The concave-convex grooves are arranged obliquely with respect to the axial direction of the expanding head. Bearings are provided at both ends of the expanding head to enable the expanding head to rotate freely.

[0007] Preferably, a continuous concave-convex groove is provided on the contact surface between the expansion head and the inner wall of the tube.

[0008] Preferably, the bearing is a thrust bearing.

[0009] Beneficial effect: The utility model provides a rotating oblique concave-convex groove expansion head assembly. Using the expansion head assembly with this structure for tube expansion can make the inner wall of the copper tube appear in a threaded concave-convex shape, which can effectively increase its internal heat exchange area while promoting water flow disturbance to improve its heat exchange coefficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the structure of the utility model.

[0011] Figure 2 This is a main schematic diagram of the utility model.

[0012] Figure 3 This is a bottom view of the present invention.

[0013] Description of reference numerals:

[0014] Numbers in the figure: expansion rod 1; expansion head 2; expansion head fixing cap 3; concave and convex groove 4; bearing 5. DETAILED DESCRIPTION

[0015] A specific embodiment of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiment.

[0016] Example: Figure 1-3 As shown, the embodiment of the present invention provides a rotating oblique concave-convex groove expansion head assembly,

[0017] It includes an expansion rod 1, an expansion head 2 and an expansion head fixing cap 3. A number of concave-convex grooves 4 are provided on the contact surface between the expansion head 2 and the inner wall of the tube. The concave-convex grooves 4 are inclined to the axial direction of the expansion head 2, that is, the length direction of the slotting direction of the concave-convex groove 4 is parallel to the axial direction of the expansion head 2 and there is a certain angle. Bearings 5 ​​are provided at both ends of the expansion head 2 to enable the expansion head 2 to rotate freely, that is, bearings 5 ​​are provided at the connection and contact points between the expansion head 2 and the upper and lower ends of the expansion rod 1 and the expansion head fixing cap 3. The bearing 5 is a thrust bearing, which enables the expansion head 2 to rotate during the tube expansion process to form a threaded concave-convex groove.

[0018] Specifically, a continuous concave-convex groove 4 is provided on the contact surface between the expanding head 2 and the inner wall of the tube. The continuous concave-convex groove 4 can be formed in a wave shape or a tooth shape.

[0019] The above disclosures are only a few specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. A rotating oblique concave-convex groove expansion head assembly, comprising an expansion rod (1), an expansion head (2) and an expansion head fixing cap (3), characterized in that: A plurality of concave-convex grooves (4) are provided on the contact surface between the expanding head (2) and the inner wall of the tube. The concave-convex grooves (4) are arranged obliquely with respect to the axial direction of the expanding head (2). Bearings (5) are provided at both ends of the expanding head (2) to enable the expanding head (2) to rotate freely.

2. The rotating oblique concave-convex groove expansion head assembly according to claim 1, characterized in that: A continuous concave-convex groove (4) is provided on the contact surface between the expansion head (2) and the inner wall of the tube.

3. The rotating oblique concave-convex groove expansion head assembly according to claim 1, characterized in that: The bearing (5) is a thrust bearing.

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