A liquid-absorbing core structure with anti-vibration characteristics and a manufacturing method thereof

Abstract

The present invention relates to a wick structure with anti-vibration properties, comprising a metal substrate, a metal powder wick and a wire mesh wick provided on the metal substrate, the two ends of the metal powder wick being connected to the metal substrate and the wire mesh wick respectively, the wire mesh wick being provided with a plurality of micropores, and sealing devices being provided at the connection boundary between the metal powder wick and the metal substrate and at the connection boundary between the metal powder wick and the wire mesh wick respectively. The micropores of the wire mesh wick can prevent the working medium from overflowing during vibration, and the wire mesh structure can prevent the metal powder wick from being damaged during vibration. The wire mesh structure of the wire mesh wick has a high permeability, allowing the working medium to undergo a rapid phase change between the condensation section and the evaporation end. The wire mesh wick and the metal powder wick have a high capillary force, resulting in the phase change heat transfer element having excellent isothermal characteristics and heat transfer performance. The present invention also relates to a method for manufacturing a wick structure with anti-vibration properties.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid absorbent cores, in particular to a liquid absorbent core structure with anti-vibration characteristics and a manufacturing method thereof. Background Art

[0002] High-power electronic equipment on loading platforms such as aviation and locomotives all operate under vibration conditions and have special heat dissipation requirements. Currently, the main research area of phase change heat transfer elements is the heat transfer performance under non-vibration conditions.

[0003] The heat transfer process of the phase change heat transfer element is mainly caused by the phase change of the working medium. The comprehensive capillary performance of the liquid wick has an important influence on the heat transfer performance of the phase change heat transfer element.

[0004] Currently, the main wick structures include powder sintering structure, groove structure, powder sintering and groove composite structure, and fiber structure. The disadvantage of these wick structures is that they are prone to cause overflow of the working fluid under vibration conditions, thereby affecting the reflux rate of the working fluid and causing a decrease in the isothermal performance of the phase change heat transfer element. In addition, long-term vibration conditions can easily cause damage to the wick structure, thereby reducing the overall capillary performance and the heat transfer performance of the phase change heat transfer element. Summary of the Invention

[0005] In response to the technical problems existing in the prior art, one of the objectives of the present invention is to provide a liquid wick structure with anti-vibration characteristics, which can prevent the working medium from overflowing under vibration conditions, and the liquid wick structure is not easily damaged, thereby improving the heat transfer performance of the phase change heat transfer element.

[0006] In response to the technical problems existing in the prior art, a second object of the present invention is to provide a method for manufacturing a wick structure with anti-vibration properties. The wick structure manufactured by this method can prevent the working medium from overflowing under vibration conditions, and the wick structure is not easily damaged, thereby improving the heat transfer performance of the phase change heat transfer element.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A liquid absorbent core structure with anti-vibration characteristics includes a metal base, a metal powder liquid absorbent core and a wire mesh liquid absorbent core provided on the metal base, two ends of the metal powder liquid absorbent core are respectively connected to the metal base and the wire mesh liquid absorbent core, the wire mesh liquid absorbent core is provided with multiple micropores, and sealing devices are respectively provided at the connection boundary between the metal powder liquid absorbent core and the metal base, and at the connection boundary between the metal powder liquid absorbent core and the wire mesh liquid absorbent core.

[0009] Furthermore, the wire mesh liquid wick is a wire mesh structure formed by cross-weaving metal fibers in the same direction.

[0010] Furthermore, the thickness of the silk screen liquid wick is 0.1 to 0.15 mm.

[0011] Furthermore, the metal fiber is copper fiber or stainless steel fiber.

[0012] Furthermore, the micropores of the wire mesh wick are rectangular, diamond-shaped or triangular.

[0013] Furthermore, the metal substrate is provided with a plurality of protrusions at intervals, and the plurality of protrusions are respectively provided corresponding to the metal powder liquid wicks.

[0014] Furthermore, the longitudinal section of the protrusion gradually increases from top to bottom, and the height of the protrusion is 0.1 to 0.2 mm.

[0015] Furthermore, the metal substrate is in a plate or tube shape, and the shapes of the metal powder wick and the wire mesh wick are both adapted to the metal substrate.

[0016] Furthermore, the metal matrix is made of copper, stainless steel or alloy, the metal powder liquid wick is made of copper powder or stainless steel powder, and the thickness of the metal powder liquid wick is 0.08-0.1 mm.

[0017] A method for manufacturing a liquid-absorbing core structure with anti-vibration characteristics comprises the following steps:

[0018] Laying the metal powder wick and the wire mesh wick on the metal substrate in sequence;

[0019] Apply silver solder paste to the connection boundary between the metal powder wick and the metal substrate and the connection boundary between the metal powder wick and the silk screen wick respectively;

[0020] After compacting the metal matrix, metal powder wick and wire mesh wick with a fixture, place them in a protective atmosphere at 750-850°C and solder them along the silver solder paste track. After soldering, place them in a vacuum environment and cool them to room temperature.

[0021] The clamp is released to obtain a wick structure with anti-vibration properties.

[0022] In general, the present invention has the following advantages:

[0023] Because the wire mesh wick has multiple micropores, its smaller pore size effectively prevents the working fluid from overflowing during vibration. At the same time, the wire mesh structure of the wire mesh wick protects the metal powder wick, preventing damage during vibration. The high permeability of the wire mesh structure reduces the flow resistance of the working fluid, allowing the working fluid to quickly undergo phase change between the condensation section and the evaporation end. Furthermore, the wire mesh wick and the metal powder wick have a high capillary force, resulting in the phase change heat transfer element having excellent isothermal characteristics and heat transfer performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic cross-sectional view of a liquid-absorbing core structure with anti-vibration properties (the metal substrate is plate-shaped).

[0025] Figure 2 It is a schematic cross-sectional view of a plate-shaped metal substrate of a wick structure having anti-vibration properties.

[0026] Figure 3 Schematic diagrams of several cross sections of a wire mesh absorbent core structure with anti-vibration properties.

[0027] Figure 4 This is a schematic diagram of the assembly of a graphite abrasive tool with a liquid-absorbing core structure having anti-vibration characteristics (the metal substrate is plate-shaped).

[0028] Figure 5 It is a schematic cross-sectional view of a wick structure with anti-vibration properties (the metal matrix is tubular).

[0029] Figure 6 This is a schematic diagram of the graphite rod assembly of the wick structure with anti-vibration characteristics (the metal substrate is tubular).

[0030] Description of reference numerals:

[0031] 1-metal substrate, 11-protrusion; 2-silver solder paste; 3-metal powder wick; 4-wire mesh wick; 5-graphite upper cover; 6-graphite lower cover; 7-graphite rod. DETAILED DESCRIPTION

[0032] The present invention will be described in further detail below.

[0033] Example 1

[0034] like Figure 1 As shown, a liquid absorbent core structure with anti-vibration characteristics includes a metal base 1, a metal powder liquid absorbent core 3 and a wire mesh liquid absorbent core 4 are provided on the metal base 1, the two ends of the metal powder liquid absorbent core 3 are respectively connected to the metal base 1 and the wire mesh liquid absorbent core 4, the wire mesh liquid absorbent core 4 is provided with a plurality of micropores, and the connection boundary between the metal powder liquid absorbent core 3 and the metal base 1 and the connection boundary between the metal powder liquid absorbent core 3 and the wire mesh liquid absorbent core 4 are respectively provided with sealing devices.

[0035] During operation, the working medium flows in the space enclosed by the metal base 1, the metal powder wick 3, the wire mesh wick 4 and the sealing device. Since the wire mesh wick 4 is provided with a plurality of micropores, its smaller pore size can effectively prevent the working medium from overflowing during the vibration process. At the same time, the wire mesh structure of the wire mesh wick 4 can protect the metal powder wick 3 and prevent the metal powder wick 3 from being damaged during the vibration process. Since the wire mesh structure of the wire mesh wick 4 has a high permeability, the flow resistance of the working medium is small, and the working medium can quickly undergo phase change conversion between the condensation section and the evaporation end, and the wire mesh wick 4 and the metal powder wick 3 have a high capillary force, so that the phase change heat transfer element has excellent isothermal characteristics and heat transfer performance. The wick structure with anti-vibration characteristics of this embodiment has the advantages of low manufacturing cost and simple manufacturing, and can meet the needs of industrial production.

[0036] The wire mesh absorbent core 4 is a wire mesh structure formed by cross-weaving metal fibers in the same direction.

[0037] The metal fibers have strong toughness, and the wire mesh structure woven with the metal fibers can effectively protect the metal powder liquid absorbent core 3 and prevent the metal powder liquid absorbent core 3 from being damaged during the vibration process.

[0038] The thickness of the silk screen liquid wick 4 is 0.1 to 0.15 mm.

[0039] The metal fiber is copper fiber or stainless steel fiber.

[0040] like Figure 3 As shown in a, b, and c, the micropores of the wire mesh absorbent core 4 are rectangular, diamond-shaped, or triangular.

[0041] The metal base 1 is provided with a plurality of protrusions 11 at intervals, and the plurality of protrusions 11 are respectively provided corresponding to the metal powder liquid absorbent cores 3 .

[0042] The multiple protrusions 11 of the metal base 1 are scale-like and are formed by milling. They are a liquid-absorbing core structure, which improves the capillary properties of the metal base 1 and enhances the isothermal properties and heat transfer performance of the entire liquid-absorbing core structure with anti-vibration properties.

[0043] The longitudinal section of the protrusion 11 gradually increases from top to bottom, and the height of the protrusion 11 is 0.1 to 0.2 mm.

[0044] Specifically, if Figure 2As shown, the metal substrate 1 has a thickness of 0.2-0.3 mm, and the protrusion 11 has a longitudinal cross-section that is an inclined triangle, with the base of the triangle located on the bottom surface of the metal substrate 1 and a height of 0.1-0.2 mm. The acute angle α between the side of the protrusion 11 and the bottom surface of the metal substrate 1 is 45°-70°, preferably 65°, and the obtuse angle β between the other side of the protrusion 11 and the bottom surface of the metal substrate 1 is 135°, which has good capillary properties.

[0045] like Figure 1 、 Figure 5 As shown, the metal substrate 1 is plate-shaped or tubular, and the shapes of the metal powder wick 3 and the wire mesh wick 4 are both adapted to the metal substrate 1 .

[0046] Based on the plate-shaped or tubular metal substrate 1, liquid-absorbing core structures with anti-vibration properties in different shapes can be manufactured, which can be suitable for more application environments.

[0047] The metal substrate 1 is made of copper, stainless steel or alloy. The metal powder wick 3 is formed by solid phase sintering of copper powder or stainless steel powder with a particle size of 100-200 meshes. The thickness of the sintered metal powder wick 3 is 0.08-0.1 mm.

[0048] Example 2

[0049] A method for manufacturing a liquid-absorbing core structure with anti-vibration characteristics comprises the following steps:

[0050] Lay the metal powder wick 3 and the wire mesh wick 4 on the metal substrate 1 in sequence;

[0051] Apply silver solder paste 2 to the connection boundary between the metal powder wick 3 and the metal substrate 1 and the connection boundary between the metal powder wick 3 and the silk screen wick 4 respectively;

[0052] After compacting the metal base 1, metal powder wick 3 and wire mesh wick 4 with a clamp, place them in a protective atmosphere (such as nitrogen or hydrogen) at 750-850°C and weld them along the track of the applied silver solder paste 2. After welding, place them in a vacuum environment and cool them to room temperature. Welding in a protective atmosphere and high temperature environment can reduce oxidation reactions and obtain better welding effects. After welding, cooling in a vacuum environment can maintain the welding effect.

[0053] The clamp is released to obtain a wick structure with anti-vibration properties.

[0054] Specifically, after the metal base 1 is fixed, silver solder paste 2 is applied along the four sides of the metal base 1;

[0055] Cut the solid-phase sintered metal powder liquid absorbent core 3 into the same size as the metal substrate 1 and evenly spread it on the metal substrate 1;

[0056] Cut the wire mesh wick 4 to a size that can be distributed in the middle of the metal substrate 1, and apply silver solder paste 2 around the surface where the wire mesh wick 4 and the metal powder wick 3 are in contact;

[0057] like Figure 4 As shown, if the metal substrate 1 is plate-shaped, the center line of the graphite upper cover 5 is aligned with the center axis of the metal substrate 1, and the graphite upper cover 5 and the graphite lower cover 6 are connected by bolts; Figure 6 As shown, if the metal substrate 1 is tubular, the central axis of the cylindrical graphite rod 7 is aligned with the axis of the tubular metal substrate 1, and the cylindrical grinding rod is inserted into the tubular metal substrate 1 to compact and fix the liquid wick;

[0058] The fixed graphite grinding tool is placed in a protective atmosphere at 750-850℃ for welding. After welding, it is placed in a vacuum environment to cool to room temperature.

[0059] After completion, loosen the graphite grinder and take out the welded wick structure.

[0060] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A method for manufacturing a wick structure having anti-vibration properties, characterized in that: The liquid absorbent core structure with anti-vibration characteristics includes a metal base, a metal powder liquid absorbent core and a wire mesh liquid absorbent core are provided on the metal base, a plurality of protrusions are provided at intervals on the metal base, the plurality of protrusions are respectively arranged corresponding to the metal powder liquid absorbent cores, the longitudinal cross-section of the protrusion is an inclined triangle, the base of the triangle is located on the bottom surface of the metal base, the acute angle α between the side of the protrusion and the bottom surface of the metal base is 45° to 70°, and the obtuse angle β between the other side of the protrusion and the bottom surface of the metal base is 135°, the two ends of the metal powder liquid absorbent core are respectively connected to the metal base and the wire mesh liquid absorbent core, the wire mesh liquid absorbent core is provided with a plurality of micropores, and the connection boundary between the metal powder liquid absorbent core and the metal base and the connection boundary between the metal powder liquid absorbent core and the wire mesh liquid absorbent core are respectively provided with a sealing device; The manufacturing method comprises the following steps, Laying the metal powder wick and the wire mesh wick on the metal substrate in sequence; Apply silver solder paste to the connection boundary between the metal powder wick and the metal substrate and the connection boundary between the metal powder wick and the silk screen wick respectively; After compacting the metal matrix, metal powder wick and wire mesh wick with a fixture, place them in a protective atmosphere at 750-850°C and solder them along the silver solder paste track. After soldering, place them in a vacuum environment and cool them to room temperature. The clamp is released to obtain a wick structure with anti-vibration properties.

2. The manufacturing method according to claim 1, characterized in that: The wire mesh absorbent core is a wire mesh structure formed by cross-weaving metal fibers in the same direction.

3. The manufacturing method according to claim 2, characterized in that: The thickness of the wire mesh liquid absorbent core is 0.1 to 0.15 mm.

4. The manufacturing method according to claim 2, characterized in that: The metal fiber is copper fiber or stainless steel fiber.

5. The manufacturing method according to claim 1, characterized in that: The micropores of the wire mesh wick are rectangular, diamond or triangular.

6. The manufacturing method according to claim 1, characterized in that: The longitudinal section of the protrusion gradually increases from top to bottom, and the protrusion height is 0.1 to 0.2 mm.

7. The manufacturing method according to claim 1, characterized in that: The metal matrix is in plate or tube shape, and the shapes of the metal powder wick and the wire mesh wick are both adapted to the metal matrix.

8. The manufacturing method according to any one of claims 1 to 7, characterized in that: The metal matrix is copper, stainless steel or alloy, the metal powder liquid wick is made of copper powder or stainless steel powder, and the thickness of the metal powder liquid wick is 0.08-0.1mm.

Images