Inline concave-convex groove heat exchanger expansion head assembly

Abstract

The utility model belongs to the technical field of heat exchanger expansion head assemblies, and particularly relates to an in-line concave-convex groove heat exchanger 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, and the concave-convex grooves are parallel to the axial direction of the expansion head. According to the in-line concave-convex groove heat exchanger expansion head assembly provided by the utility model, when the expansion head assembly with the structure is used for expanding a pipe, the inner wall of the copper pipe can be in a concave-convex shape, the internal heat exchange area can be effectively increased, and the heat exchange coefficient can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchanger expansion head components, in particular to an in-line concave-convex groove heat exchanger 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 an expansion head assembly of an in-line concave-convex groove heat exchanger, which can solve the problems pointed out in the background technology.

[0006] A straight-line concave-convex groove heat exchanger expansion head assembly comprises an expansion rod, an expansion head and an expansion head fixing cap. The contact surface between the expansion head and the inner wall of the tube is provided with a plurality of concave-convex grooves, and the concave-convex grooves are arranged parallel to the axial direction of the expansion head.

[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] Beneficial effect: The utility model provides an expansion head assembly for an in-line concave-convex groove heat exchanger. When the expansion head assembly of this structure is used for tube expansion, a concave-convex shape can appear on the inner wall of the copper tube, which can effectively increase its internal heat exchange area and improve its heat exchange coefficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the structure of the utility model.

[0010] Figure 2 This is a main schematic diagram of the utility model.

[0011] Figure 3 This is a top view of the utility model.

[0012] Description of reference numerals:

[0013] Reference numerals in the figure: expansion rod 1; expansion head 2; expansion head fixing cap 3; concave-convex groove 4. DETAILED DESCRIPTION

[0014] 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.

[0015] Example: Figure 1-3 As shown, an embodiment of the utility model provides an in-line concave-convex groove heat exchanger expansion head assembly, including an expansion rod 1, an expansion head 2 and an expansion head fixing cap 3. A plurality of concave-convex grooves 4 are provided on the contact surface between the expansion head 2 and the inner wall of the tube. The inner wall of the tube is the inner wall of the copper tube. The concave-convex groove 4 is arranged parallel to the axial direction of the expansion head 2. Here, it means that the groove direction (length direction) of the concave-convex groove 4 is arranged parallel to the axial direction of the expansion head 2. Specifically, a circle of continuous concave-convex grooves 4 is provided on the contact surface between the expansion head 2 and the inner wall of the tube, that is, a circle of continuous concave-convex grooves 4 is provided on the circumference of the contact surface of the expansion head. The continuous concave-convex grooves 4 can form a wave shape, a tooth shape, or the like.

[0016] 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. An expansion head assembly for an in-line concave-convex groove heat exchanger, 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 expansion head (2) and the inner wall of the tube, and the concave-convex grooves (4) are arranged parallel to the axial direction of the expansion head (2).

2. The in-line concave-convex groove heat exchanger 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.

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