Multi-cavity relay high-efficiency anti-freezing gravity heat pipe

Abstract

The utility model discloses a multi -cavity relay high -efficient anti -frozen gravity heat pipe belongs to heat energy utilization technical field, including at least two series connection's heat transfer unit, the heat transfer unit includes the heat cavity guide tube and forms the taper end socket at the heat cavity guide tube bottom, the upper portion sealed of the heat transfer unit located the most upper end has the upper end encapsulation structure, and the taper end socket of last level heat transfer unit inserts the upper port of the heat cavity guide tube of next level heat transfer unit, and is sealed by annular weld joint welding, makes the internal cavity space of each heat transfer unit mutually isolated, the phase -change medium is filled independently in the cavity of every heat transfer unit, and the filling volume of phase -change medium is less than the volume of the taper end socket of its cavity. The multi -cavity relay high -efficient anti -frozen gravity heat pipe of the utility model example, through multi -cavity relay heat transfer mechanism, realized the full -section utilization and long -distance high -efficient transmission of heat, and simultaneously utilizes the collaborative design of filling amount and taper end socket, fundamentally solves the problem of phase -change medium frost heaving and cracking heat pipe.

Description

Technical Field

[0001] This utility model relates to the field of thermal energy utilization technology, and in particular to a multi-cavity relay high-efficiency antifreeze gravity heat pipe. Background Technology

[0002] Traditional gravity heat pipes typically consist of a single sealed tube, an evaporation section at the bottom, and a condensation section at the top, filled with a small amount of phase change medium. During operation, the evaporation section absorbs heat, causing the phase change medium to vaporize. The vapor rises to the condensation section under pressure difference, releases its latent heat of condensation, and then re-liquefies. The liquid phase change medium then flows back to the evaporation section along the tube wall under gravity, and this cycle repeats continuously.

[0003] However, this traditional single-cavity gravity heat pipe has significant limitations in practice: Limited start-up temperature range: The phase change medium is deposited at the bottom of the heat pipe due to gravity, and evaporation can only start when heat acts on the medium. If the heat in the temperature range is in the middle of a single gravity-fed heat pipe, the heat transfer through the heat pipe wall is slow and it is difficult to directly act on the medium at the bottom. This results in insufficient heat utilization across the entire temperature range, and in severe cases, it can even prevent the medium from starting and cause the heat pipe to fail.

[0004] Heat transfer distance and efficiency are limited: The effective heat transfer length of a single gravity heat pipe is limited by the circulation capacity of its internal phase change medium. When the heat transfer distance of a traditional heat pipe is too long, the pressure drop of the vapor flow increases, the resistance to condensate return increases, leading to a sharp drop in heat transfer efficiency, and even failure due to heat transfer limit.

[0005] Poor freeze resistance, prone to freezing and cracking: When using low-cost phase change media such as water with high latent heat of phase change, if the heat pipe stops working in a low-temperature environment, the phase change media will freeze into ice. In the evaporation section of a traditional flat-bottom or round-bottom structure, this expansion force has nowhere to be released and will act directly on the pipe wall, generating huge internal stress, which can easily cause the bottom of the heat pipe to crack and cause permanent damage. Utility Model Content

[0006] To address the shortcomings of the existing technology, the purpose of this invention is to provide a multi-cavity relay high-efficiency antifreeze gravity heat pipe. Through the multi-cavity relay heat transfer mechanism and the multi-temperature zone evaporation end design, it achieves full utilization of heat and efficient long-distance transmission. At the same time, by utilizing the coordinated design of the filling volume and the tapered end cap, it fundamentally solves the problem of phase change medium freezing expansion and cracking of heat pipes.

[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: A multi-cavity relay high-efficiency antifreeze gravity heat pipe is provided, including at least two heat transfer units connected in series. Each heat transfer unit includes a heat cavity conduit and a tapered end cap formed at the bottom of the heat cavity conduit. The upper part of the heat transfer unit at the uppermost end is sealed with an upper end encapsulation structure. The tapered end cap of the heat transfer unit at the upper level is inserted into the upper port of the heat cavity conduit of the heat transfer unit at the lower level and sealed by an annular weld, so that the internal cavity space of each heat transfer unit is isolated from each other. Furthermore, the upper encapsulation structure is a flat end cap, a dome end cap, or a concave spherical end cap.

[0008] Furthermore, the upper packaging structure area is provided with spiral inner ribs or axial grooves.

[0009] Furthermore, the tapered end cap is integrally formed from the bottom end of the hot cavity conduit through a tapered tip reduction process, forming an inverted cone-shaped sealed space.

[0010] Furthermore, the tapered head of the heat transfer unit is filled with a phase change medium, and the filling volume of the phase change medium is smaller than the volume of the tapered head of the heat transfer unit.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The multi-cavity relay high-efficiency antifreeze gravity heat pipe of this utility model, by welding multiple heat transfer units in series, each unit forms an independent evaporation-condensation cycle, which constitutes a "heat relay transfer" mechanism. This fundamentally solves the defects of traditional single-cavity gravity heat pipes, which suffer from a sharp decline in efficiency due to the single limitation of the evaporation end and the increase in heat transfer distance. It realizes the multi-stage evaporation utilization of heat and the efficient and stable transmission between ultra-long distances or multiple different temperature zones, which greatly expands the effective application range of heat pipes. 2. The multi-cavity relay high-efficiency antifreeze gravity heat pipe of this utility model provides a dedicated containment space and stress release channel for the volume expansion of the phase change medium when it freezes through the coordinated design of tapered end cap and charge volume control. The tapered structure converts the expansion force into an upward safe thrust, fundamentally avoiding the risk of traditional flat-bottom or round-bottom heat pipes being cracked. It is especially suitable for long-term stable operation in cold environments using high-performance phase change media such as water, and its service life is greatly improved. 3. The multi-cavity relay high-efficiency antifreeze gravity heat pipe of this utility model has spiral inner fins or axial grooves in the condensation section, which can increase the surface area of ​​the inner wall, provide more points for steam condensation, and enhance condensation heat transfer. Attached Figure Description

[0012] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the upper packaging structure.

[0013] In the figure: 1-Heat transfer unit, 2-Heat cavity conduit, 3-Tapered end cap, 4-Upper end encapsulation structure, 5-Helical inner fins, 6-Phase change medium. Detailed Implementation

[0014] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0015] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0016] like Figure 1-2 As shown, this embodiment provides a multi-cavity relay high-efficiency antifreeze gravity heat pipe, which consists of three heat transfer units 1 connected in series. In practical applications, the number of heat transfer units 1 can be increased or decreased as needed. Each heat transfer unit 1 includes a heat cavity conduit 2 and a tapered end cap 3 formed at the bottom of the heat cavity conduit 2. The uppermost heat transfer unit 1 is sealed with an upper end encapsulation structure 4. Each heat transfer unit 1 is independently filled with a phase change medium 6. The control of the filling amount is the key to achieving antifreeze properties. The filling volume of the phase change medium 6 is smaller than the volume of the tapered end cap 3 of its cavity.

[0017] Specifically, the heat chamber conduit 2 is a circular thin-walled metal tube, and its material can be copper, aluminum, or their alloys. The tapered end cap 3 is integrally formed from the bottom end of the heat chamber conduit 2 through a tapered tip reduction process, forming an inverted conical sealed space. The upper part of the heat transfer unit 1 at the uppermost end is sealed with an upper encapsulation structure 4 by welding.

[0018] The series connection is achieved by inserting the tapered end cap 3 of the upper-level heat transfer unit 1 into the upper port of the heat cavity conduit 2 of the lower-level heat transfer unit 1, and sealing it with an annular weld. This ensures reliable sealing. This isolates the internal cavity spaces of each heat transfer unit 1 from each other, forming independent phase change medium circulation units.

[0019] In this embodiment, the upper encapsulation structure 4 is a dome-shaped head. To enhance heat exchange efficiency, spiral inner ribs 5 are provided on the inner wall of the upper encapsulation structure 4.

[0020] During heat transfer, heat can be input from the bottom tapered end cap 3 of the first-stage or any other stage of the heat chamber unit, heating the phase change medium 6 at that location. The medium vaporizes and rises, releasing heat and liquefying at the top of the unit before flowing back to the bottom, completing the heat transfer within the unit's temperature range. This heat transfer continues stage by stage, ultimately releasing heat at the uppermost encapsulation structure 4 of the top-level unit. This solves the problem of single-cavity heat pipes where the bottom medium is difficult to vaporize when heat is concentrated in the middle, achieving heat utilization across the entire temperature range.

[0021] When the heat pipe is in a low-temperature environment, the phase change medium 6 freezes and solidifies, expanding in volume. Since the filling volume is less than the volume of the tapered head 3, it provides dedicated space to accommodate the expansion of the ice. At the same time, the tapered structure decomposes the expansion force, generating an upward axial thrust. This thrust effectively avoids the concentration of expansion stress on the straight wall of the heat chamber duct 2, thus fundamentally preventing the heat pipe from cracking.

[0022] Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-mentioned technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-mentioned technical features or their equivalent features without departing from the inventive concept. For example, technical solutions formed by substituting the above-mentioned features with technical features disclosed in this application (but not limited to) that have similar functions.

Claims

1. A multi-cavity relay high-efficiency antifreeze gravity heat pipe, characterized in that, It includes at least two heat transfer units (1) connected in series. Each heat transfer unit (1) includes a heat cavity conduit (2) and a tapered end cap (3) formed at the bottom of the heat cavity conduit (2). The upper part of the heat transfer unit (1) at the uppermost end is sealed with an upper end encapsulation structure (4). The tapered end cap (3) of the heat transfer unit (1) at the upper level is inserted into the upper port of the heat cavity conduit (2) of the heat transfer unit (1) at the lower level and sealed by an annular weld, so that the internal cavity space of each heat transfer unit (1) is isolated from each other. Each heat transfer unit (1) is independently filled with a phase change medium (6), and the filling volume of the phase change medium (6) is smaller than the volume of the tapered head (3) of the cavity in which it is located.

2. The multi-cavity relay high-efficiency antifreeze gravity heat pipe according to claim 1, characterized in that, The upper encapsulation structure (4) is a flat end cap, a dome end cap, or a concave spherical end cap.

3. The multi-cavity relay high-efficiency antifreeze gravity heat pipe according to claim 1, characterized in that, The upper encapsulation structure (4) has a spiral inner rib (5) or an axial groove on its inner wall.

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