Evaporation heat exchange tube

Abstract

The utility model relates to an evaporation heat exchange tube which comprises a tube body, a plurality of radial counter bores distributed in an array mode are formed in the peripheral wall of the tube body, the opening direction of the radial counter bores faces the radial direction of the tube body, and an internal thread groove is formed in the inner surface of the tube body. The radial counter bores are formed in the surface of the evaporation heat exchange pipe and used for containing cooling liquid, a vaporization cavity is formed synchronously, and the heat exchange efficiency in the pipe is improved; meanwhile, the internal thread grooves are formed in the inner surface of the pipe body, so that the turbulence degree of fluid in the pipe is enhanced, the heat exchange area in the pipe is increased, the heat exchange coefficient in the pipe is improved, and the heat exchange process is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of evaporative heat exchange in air-conditioning and refrigeration systems, in particular to an evaporative heat exchange tube. Background Art

[0002] With the rapid development of the economy and society, my country has rapidly become a major energy consumer in the world. The annual increase in energy production and consumption has brought tremendous pressure to my country's energy security and environmental capacity, and posed a major challenge to the sustainable development of my country's economy and society.

[0003] As is well known in the industry, many fields, including refrigeration, air-conditioning, and energy and power engineering, involve the evaporation of liquids from the outer surface of tube bundles, particularly in refrigeration and air-conditioning system refrigeration units. In recent years, with the continuous advancement of air-conditioning equipment manufacturing technology, the requirements for high efficiency, energy conservation, and environmental protection have become increasingly stringent. The evaporators of some large central air conditioning heat exchanger units all utilize flooded copper evaporator tubes. Due to the excellent plasticity of copper, mechanical extrusion or welding is often used to form three-dimensional fins and grooves on the outer surface of the copper tubes to increase the heat transfer area and improve the heat transfer coefficient. However, welding creates contact thermal resistance between the tube body and the fin roots, making it less popular in the industry. However, mechanical extrusion methods limit the number of fins that can be produced, resulting in a limited number of vaporization cores. This restricts the heat transfer performance of the evaporator tubes, necessitating in-depth research and efforts to address this issue. Utility Model Content

[0004] The utility model aims to provide an evaporation heat exchange tube, which solves the problem of how to improve the heat exchange efficiency.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] The utility model provides an evaporative heat exchange tube, characterized in that it includes a tube body, a plurality of radial countersunk holes distributed in an array are opened on the outer peripheral wall of the tube body, and the opening direction of the radial countersunk holes is arranged radially toward the tube body, and an internal thread groove is opened on the inner surface of the tube body.

[0007] Furthermore, the radial counterbore includes a first cylindrical portion at the upper end, a second cylindrical portion at the bottom end, and a frustum portion connected between the first cylindrical portion and the second cylindrical portion.

[0008] Furthermore, the diameter of the first cylindrical portion is smaller than the diameter of the second cylindrical portion.

[0009] Furthermore, an inverted conical groove is provided at the bottom of the radial countersunk hole.

[0010] Furthermore, the internal thread groove extends in a spiral state on the inner surface of the tube body around the axis of the tube body along the length direction of the tube body.

[0011] Furthermore, the groove spirally passes through the channel around at least one side outer wall of the root of the inner fin.

[0012] Furthermore, the grooves are spirally arranged around at least one side outer wall of the inner fin root and are spaced apart in the channel.

[0013] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0014] The utility model provides an evaporative heat exchange tube, which is used to accommodate coolant by opening a plurality of radial countersunk holes on the surface of the evaporative heat exchange tube, thereby forming a vaporization cavity and improving the heat exchange efficiency in the tube; at the same time, an internal thread groove is opened on the inner surface of the tube body, thereby enhancing the turbulence of the fluid in the tube, increasing the heat exchange area in the tube, improving the heat exchange coefficient in the tube, and strengthening the heat exchange process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of an evaporation heat exchange tube provided by the utility model;

[0017] Figure 2 This is a cross-sectional schematic diagram of an evaporation heat exchange tube provided by the utility model;

[0018] Figure 3 This is a top view of an evaporation heat exchange tube provided by the utility model.

[0019] The description of the accompanying drawings is as follows:

[0020] 1. Tube body; 2. Radial countersunk hole; 201. First cylindrical portion; 202. Second cylindrical portion; 203. Cone portion; 3. Internal thread groove; 4. Inverted conical groove. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0022] like Figure 1 The three-dimensional schematic diagram of an evaporation heat exchange tube is a sectioned portion of the tube. It includes a tube body 1, a radial countersunk hole 2 provided on the outer wall of the tube body 1, and an internally threaded groove 3 provided on the inner surface of the tube body 1. The radial countersunk hole 2 and the internally threaded groove 3 are integrally formed with the tube body 1.

[0023] See Figure 3 The radial countersunk holes 2 are distributed in an array on the outer peripheral wall of the tube body 1, and the opening direction thereof is set toward the radial direction of the tube body 1 and the opening has a certain depth. Figure 2 The radial counterbore 2 includes a first cylindrical portion 201 disposed at the upper end of the hole, a second cylindrical portion 202 disposed at the lower end of the hole, and a frustum portion 203 connected between the first cylindrical portion 201 and the second cylindrical portion 202. In a preferred embodiment of the present invention, the diameter of the first cylindrical portion 201 is set smaller than the diameter of the second cylindrical portion 202, thereby forming a structure with a small opening diameter and a large inner cavity. In turn, the cavity below the opening has an inclined surface directed outward from the tube body 1, which facilitates the coolant entering the cavity to overflow the cavity after absorbing heat and vaporizing into bubbles.

[0024] At the same time, in an embodiment of the present invention, an inverted conical groove 4 is also provided at the bottom of the radial countersunk hole 2, which can further increase the vaporization core of the aforementioned radial countersunk hole 2 and increase the heat exchange area outside the tube, which is conducive to exerting its heat transfer performance more effectively and improving the heat transfer coefficient outside the tube.

[0025] In an embodiment of the present invention, the internally threaded groove 3 provided on the inner surface of the tube body 1 extends in a spiral pattern along the length of the tube body 1 and around the axis of the tube body 1. The groove is configured as an internal thread, and the fluid in the tube forms turbulent flow along the spiral direction while also swirling along the groove wall, thereby generating turbulent flow. During turbulent flow, the fluid generates shear forces on the inner surface of the tube body 1, causing the boundary layer to be disturbed, increasing the effective heat transfer area of ​​the heat transfer interface, reducing the thermal resistance on the heat transfer surface, and thereby improving heat exchange efficiency.

[0026] In summary, the evaporative heat exchange tube in this example has several radial countersunk holes 2 formed in the tube body 1, which serve as vaporization cavities. These radial countersunk holes 2 are designed with a small aperture and a large inner cavity, thereby allowing vaporized bubbles of coolant to be more easily directed out of the aforementioned cavity. Furthermore, an inverted conical groove 4 is provided at the bottom of the aforementioned radial countersunk hole 2, thereby increasing the vaporization core on the outer surface of the tube body 1 and maximizing the heat exchange area outside the tube, thereby improving heat exchange efficiency. Furthermore, the internally threaded groove 3 on the inner surface of the tube body 1 promotes convection and mixing of the fluid, creating a turbulent flow within the tube and effectively improving heat exchange efficiency.

[0027] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. An evaporating heat exchange tube, characterized in that: The invention comprises a tube body (1), wherein a plurality of radial countersunk holes (2) distributed in an array are formed on the outer peripheral wall of the tube body (1), and the opening direction of the radial countersunk holes (2) is arranged radially toward the tube body (1); and an internal thread groove (3) is formed on the inner surface of the tube body (1).

2. The evaporation heat exchange tube according to claim 1, characterized in that: The radial countersunk hole (2) comprises a first cylindrical portion (201) at an upper end, a second cylindrical portion (202) at a lower end, and a frustum portion (203) connected between the first cylindrical portion (201) and the second cylindrical portion (202).

3. The evaporation heat exchange tube according to claim 2, characterized in that: The diameter of the first cylindrical portion (201) is smaller than the diameter of the second cylindrical portion (202).

4. An evaporation heat exchange tube according to claim 1 or 2, characterized in that: An inverted cone-shaped groove (4) is provided at the bottom of the radial countersunk hole (2).

5. The evaporation heat exchange tube according to claim 1, characterized in that: The internal thread groove (3) extends in a spiral state around the axis of the tube body (1) on the inner surface of the tube body (1) along the length direction of the tube body (1).

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