An oil-free air compressor with high cooling performance

Abstract

The invention discloses an oil-free air compressor with high cooling performance, which belongs to the technical field of oil-free air compressors, and comprises an air compressor body, a cooling box is installed on the top of the air compressor body, an air outlet shroud is installed on the surface of the cooling box, a connecting mounting seat is installed at the connection between the cooling box and the air compressor body, an air-cooled mounting shaft is installed inside the air outlet shroud near the cooling box, a first air-cooled mounting seat is sleeved on the surface of the air-cooled mounting shaft, and a heat dissipation air-cooled device is installed on the surface of the first air-cooled mounting seat; by designing the inner wall of the cooling structure as a continuous structure with a composite curvature of an exponential contraction section, a sinusoidal disturbance section, and a parabolic derivation section, the fluid disturbance and heat exchange surface area are significantly enhanced, and the overall heat exchange capacity per unit time is improved; a spiral micro-groove disturbance structure is introduced on the surface of the sinusoidal disturbance section to form a micro-scale eddy field, which further excites boundary layer disturbance and suppresses local hot spot accumulation, thereby achieving balanced temperature difference distribution.

Description

Technical Field

[0001] The present invention relates to the technical field of oil-free air compressors, and more particularly to an oil-free air compressor with high cooling performance. Background Art

[0002] Air compressors are common compressed gas devices in industrial production and are widely used in new energy vehicles, CNC machining, precision spraying, stainless steel grinding and automated manufacturing.

[0003] As high-end manufacturing continues to increase its cleanliness requirements for oil-free compression systems, oil-free air compressors are widely used in precision industries such as automobiles, medical treatment, food, electroplating, and optics due to their ability to produce no oil mist pollution. However, existing oil-free air compressors generally have the following cooling performance issues:

[0004] First, traditional models typically use a flow channel structure with a constant cross-section and evenly distributed heat sink fins. This fails to precisely optimize airflow disturbances, boundary layer characteristics, or fluid heat transfer efficiency. This results in the heat transfer capacity per unit time of the heat sink being easily limited during use.

[0005] Secondly, existing fin structures are mostly attached at fixed angles and cannot be arranged in an orderly manner in accordance with the geometric changes or thermal resistance distribution characteristics of the air compressor housing wall. This can easily cause conduction lag in high-heat areas, leading to localized uneven heat dissipation problems.

[0006] Moreover, under high heat flux density working conditions, the thermal resistance of the air compressor is statically distributed along the structural direction and cannot adapt to dynamic temperature gradient changes, which easily leads to problems such as heat accumulation, rapid temperature rise, and poor heat dissipation. Summary of the Invention

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] An oil-free air compressor with high cooling performance, comprising:

[0009] An air compressor body, a cooling box is installed on the top of the air compressor body, an air outlet guide cover is installed on the surface of the cooling box, a connecting mounting seat is installed at the connection between the cooling box and the air compressor body, an air cooling mounting shaft is installed inside the air outlet guide cover near the cooling box, a first air cooling mounting seat is sleeved on the surface of the air cooling mounting shaft, and a heat dissipation air cooling device is installed on the surface of the first air cooling mounting seat;

[0010] A heat dissipation wall is installed inside the cooling box, and heat dissipation fins are installed on the surface of the heat dissipation wall;

[0011] The ventilation wall is designed in a wave-like manner and is installed inside the air-cooling mounting shaft. A second air-cooling mounting seat is installed on the surface of the air-cooling mounting shaft, and a third air-cooling mounting seat is installed below the second air-cooling mounting seat. The third air-cooling mounting seat and the second air-cooling mounting seat are connected to the surface of the air-cooling mounting shaft in the same manner. A bottom air outlet block is installed at the bottom of the air-cooling mounting shaft.

[0012] Furthermore, the cross-sectional shape of the heat dissipation wall is a curved surface designed with a turbulent function, and the heat dissipation wall is It is a continuously differentiable piecewise composite curvature structure, whose radius function is piecewise spliced ​​by three structure functions, including:

[0013] The exponential contraction section has a cross-sectional radius that satisfies a functional relationship along the axial height, which is used to guide the gas to accelerate into the middle section, as shown in the following formula:

[0014] ; (#1)

[0015] The sinusoidal disturbance section, whose cross-sectional radius satisfies the functional relationship along the axial height, is used to stimulate airflow disturbance and destroy the boundary layer to enhance heat transfer, as shown in the following formula:

[0016] ; (#2)

[0017] The parabolic lead-out section has a cross-sectional radius that satisfies a functional relationship along the axial height, and is used to achieve flow field rectification and stable lead-out, as shown in the following formula:

[0018] ; (#3)

[0019] The first-order derivatives of the three functions are continuous at the corresponding splicing points to form an overall smooth surface structure;

[0020] The heat exchange performance index per unit time of the cooling box is calculated by the following integral formula:

[0021] (#4).

[0022] Furthermore, the inner wall surface corresponding to the sinusoidal disturbance section of the heat dissipation wall is provided with a plurality of spirally arranged micro-grooves, the pitch of each groove is 10 to 20 mm, the depth is 0.3 to 1 mm, and the disturbance function parameters satisfy , which is used to enhance boundary layer disturbance and improve the heat transfer capacity between gas and curved surface.

[0023] Furthermore, the three segments of the radius function At the splicing point 、 Not only is the function value continuous, but its first-order derivative also satisfies:

[0024] (#6);

[0025] It is used to ensure that the changes in structural curvature are smooth and continuous during physical processing and airflow guidance, and to ensure stable transition characteristics during heat field conduction.

[0026] Furthermore, the thermal resistance function Function of local wall thickness of the structure and thermal conductivity of the inner wall material Satisfies the following relationship:

[0027] ; (#7)

[0028] in In the axial direction The structural wall thickness variation function is defined as:

[0029] ; (#8)

[0030] The minimum thermal resistance control zone is constructed in the sinusoidal disturbance section to increase the heat flux per unit time.

[0031] Furthermore, the heat dissipation fins are arranged and installed along the axial direction of the heat dissipation wall, the roots of the heat dissipation fins are in contact with the outer wall of the heat dissipation wall, and the installation angle of the heat dissipation fins is Satisfies the following functional relationship:

[0032] ; (#9)

[0033] in, Axial position The angle function between the heat sink fin and the tangent direction of the outer wall of the cooling box is used to establish the alignment relationship between the heat sink fin and the local tangent of the outer wall of the heat sink; thereby achieving heat along the thermal resistance function The shortest conduction path of the smallest section is derived to improve the overall heat release efficiency of the structure and the heat exchange balance of the outer wall.

[0034] Furthermore, the layout density of the heat sink fins is With the thermal resistance function Satisfies the following functional relationship:

[0035] ; (#10)

[0036] in, Axial position The density of heat sink fins at is the minimum layout density lower limit, is the density response coefficient, is the maximum thermal resistance in the structure, In response to the enhancement coefficient, a reinforced structural layout mechanism is formed to concentrate the fin density in the thermal resistance area.

[0037] In summary, the present invention has the following beneficial effects:

[0038] By designing the inner wall of the cooling structure into a continuous structure with compound curvature, including an exponential contraction section, a sinusoidal disturbance section, and a parabolic lead-out section, the fluid disturbance and heat transfer surface area are significantly enhanced, thereby improving the overall heat transfer capacity per unit time.

[0039] A spiral micro-groove disturbance structure is introduced on the surface of the sinusoidal disturbance section to form a micro-scale eddy field, which further stimulates boundary layer disturbances and suppresses local hot spot accumulation, achieving a balanced temperature difference distribution.

[0040] By ensuring the continuity of the first-order derivatives of the three-segment structure functions at the joints, the problems of sudden flow field changes and eddy current backflow are effectively avoided. At the same time, through CAD drive and CNC path continuity processing, the structural stability of the product can be improved.

[0041] By introducing the structural wall thickness function and the inner wall thermal conductivity into the thermal resistance function model, the thermal resistance distribution along the axial direction can be controlled and designed. The minimum thermal resistance zone can be constructed in the sinusoidal disturbance section, thereby enhancing the thermal conductivity of the high heat flux density area. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] Figure 1 This is a schematic structural diagram of the air compressor body of the present invention;

[0044] Figure 2 This is a schematic diagram of the internal cross-sectional structure of the cooling box of the present invention;

[0045] Figure 3 It is a schematic diagram of the segmented structure of the heat dissipation wall of the present invention;

[0046] Figure 4 This is a schematic diagram of the micro-groove spoiler structure installed on the surface of the heat dissipation wall of the present invention.

[0047] In the picture:

[0048] 1. Air compressor body; 2. Cooling box; 3. Air outlet guide cover; 4. Air cooling mounting shaft; 5. Heat dissipation fins; 6. Heat dissipation wall; 7. Connecting mounting seat; 8. First air cooling mounting seat; 9. Heat dissipation air cooling; 10. Second air cooling mounting seat; 11. Third air cooling mounting seat; 12. Bottom air outlet block; 13. Ventilation wall. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0050] Example:

[0051] The following is combined with Figure 1-4 The present invention is described in further detail.

[0052] See also Figure 1-4 The present invention provides a technical solution: an oil-free air compressor with high cooling performance, such as Figure 1-4 Shown, including:

[0053] An air compressor body 1 is provided with a cooling box 2 installed on the top of the air compressor body 1, an air outlet shroud 3 is installed on the surface of the cooling box 2, a connecting mounting seat 7 is installed at the connection between the cooling box 2 and the air compressor body 1, an air cooling mounting shaft 4 is installed inside the air outlet shroud 3 near the cooling box 2, a first air cooling mounting seat 8 is sleeved on the surface of the air cooling mounting shaft 4, and a heat dissipation air cooling 9 is installed on the surface of the first air cooling mounting seat 8;

[0054] The heat dissipation wall 6 is installed inside the cooling box 2. The heat dissipation fins 5 are installed on the surface of the heat dissipation wall 6. The heat dissipation fins 5 are installed obliquely.

[0055] The ventilation wall 13 is a wave-shaped design installed inside the air-cooling mounting shaft 4. The second air-cooling mounting seat 10 is installed on the surface of the air-cooling mounting shaft 4. The third air-cooling mounting seat 11 is installed below the second air-cooling mounting seat 10. The third air-cooling mounting seat 11 and the second air-cooling mounting seat 10 are connected to the surface of the air-cooling mounting shaft 4 in the same way. A bottom air outlet block 12 is installed at the bottom of the air-cooling mounting shaft 4.

[0056] In this embodiment, when the device is actually used, the heat dissipation air cooling 9 is carried by the air cooling installation shaft 4, so that the heat dissipation air cooling 9 can be fixed by the movable installation of the first air cooling installation seat 8 and the air cooling installation shaft 4 when in use, so that when the heat dissipation air cooling 9 is connected to the power, the heat dissipation air cooling 9 is started, thereby enabling the interior of the cooling box 2 to use the air cooling effect through the heat dissipation air cooling 9, and the setting of the bottom air outlet block 12 is used to pass through the ventilation wall 1 when the external air duct is passed through the top of the air cooling installation shaft 4. 3 and the air-cooling mounting shaft 4 itself are hollow, and the air-cooling mounting shaft 4 is used to dissipate cold air from the bottom air outlet block 12 to the inside of the air compressor body 1 to achieve another purpose of use, and the cooling box 2 is installed on the surface of the air compressor body 1 as a whole through the connecting mounting seat 7. Therefore, the connecting mounting seat 7 is also made of soft material to ensure the detachable connection between the cooling box 2 and the air compressor body 1. If one-piece casting is required during the casting process, the connecting mounting seat 7 can be used as a reinforcement of the cooling box 2 and directly connected to the air compressor body 1.

[0057] like Figure 1-4 As shown, the cross-sectional shape of the heat dissipation wall 6 is a curved surface designed with a turbulent function. It is a continuously differentiable piecewise composite curvature structure, whose radius function is piecewise spliced ​​by three structure functions, including:

[0058] The exponential contraction section has a cross-sectional radius that satisfies a functional relationship along the axial height, which is used to guide the gas to accelerate into the middle section, as shown in the following formula:

[0059] ; (#1)

[0060] in, The axial height of the heat dissipation wall 6 is The inner wall radius function at the position is an overall curvature expression formed by segmenting three functions. is the initial radius at the entrance of the heat dissipation structure, which is used to define the starting size of the exponential contraction section; The airflow guide attenuation coefficient controls the contraction rate of the inner wall during the exponential contraction of the lower section. This data can be reversed by the radius before and after contraction and the length of the contraction section. The specific process is: given the starting radius , end radius , contraction length , substitute into the formula Calculated, or modeled by fluid simulation tools, according to different Select the optimal pressure drop trend, velocity field distribution, inlet reflow length or area under The inlet compression section can quickly compress the airflow without causing flow separation, thus determining its design value; is the height coordinate of the inner wall in the axial direction, which is the independent variable of all functions; is the height of the splicing position between the first structural segment, the exponential contraction segment and the middle segment, and also the sinusoidal perturbation segment;

[0061] The sinusoidal disturbance section, whose cross-sectional radius satisfies the functional relationship along the axial height, is used to stimulate airflow disturbance and destroy the boundary layer to enhance heat transfer, as shown in the following formula:

[0062] ; (#2)

[0063] in, is the average radius of the middle sinusoidal perturbation segment, which is used as a reference for the center position of the sinusoidal function perturbation; is the amplitude of the sinusoidal disturbance, which determines the degree of fluctuation of the disturbance structure on the wall shape; is the wave number of the sinusoidal perturbation function, which controls the frequency of the perturbation curvature in the axial direction; is the phase of the sine function, indicating the displacement of the starting position of the disturbance; is the splicing height position between the sinusoidal perturbation section and the parabolic lead-out section;

[0064] The parabolic lead-out section has a cross-sectional radius that satisfies a functional relationship along the axial height, and is used to achieve flow field rectification and stable lead-out, as shown in the following formula:

[0065] ; (#3)

[0066] in, 、 、 are the quadratic function coefficients of the parabola derived segment, where Controls the rate of change of curvature, Controls the linear offset, Indicates the starting radius offset of the curvature segment. is the heat exchange performance evaluation value of the heat dissipation wall 6 in the axial range per unit time. In order to ensure that the inner wall curvature has good continuity at the joint of the structural segments, the parameter It can be obtained by constructing the output radius value at the end of the sinusoidal perturbation segment, forming the starting condition of the derived segment structure based on the sine function output, thereby improving the stability of the flow field derivation; It represents the total structural height of the heat dissipation wall 6 in the axial direction, that is, the entire inner wall range from the starting point to the outlet end;

[0067] The first-order derivatives of the three functions are continuous at the corresponding splicing points to form an overall smooth surface structure;

[0068] The heat transfer performance index per unit time of the heat dissipation wall 6 is calculated by the following integral formula:

[0069] ; (#4)

[0070] in, For the The modulation intensity parameter of each disturbance type represents the weight factor of the corresponding disturbance contribution to heat transfer enhancement, which is obtained through experiments and is specifically:

[0071] Prepare a control experiment group, apply different disturbance flow structures on the same thermal structure and classify them;

[0072] At the same time, the air velocity, temperature difference and materials are kept consistent, and only the turbulence structure is different;

[0073] Measure the local heat flux or heat transfer coefficient and perform normalization to construct:

[0074] ;or ;

[0075] So, that is the first The contribution ratio of the spoiler-like structure to the total spoiler structure;

[0076] For the The frequency parameter of the disturbance-like structure in the axial direction is used to describe the periodic changes of the airflow disturbance; For the The starting point of the phase of the quasi-disturbance corresponds to the initial position of the axial arrangement of the disturbance structure;

[0077] For the The modulation coefficient of the nonlinear coupling of the quasi-disturbance to the local airflow controls the influence range of the turbulence on the heat dissipation enhancement, which affects the length through the disturbance Inversely, by defining The length of the axial effect of the turbulent structure that can significantly affect the thermal enhancement is , then take Here we give an example to illustrate that if a certain type of spoiler structure is It is only valid within 20mm. If a certain type of guide groove type spoiler can affect the entire structure length of 100mm, then , The larger the value, the more localized the impact but the stronger the effect; the smaller the value, the wider the impact but the flatter the distribution;

[0078] is the pressure drop exponential attenuation factor of the air in the flow direction inside the structure, which is used to reflect the exponential weakening of the heat transfer capacity due to the axial pressure change. This value is fitted according to the pressure distribution. Specifically, at the structure inlet The pressure is , a certain The pressure at ,but , the measured pressure value is substituted into the actual pressure value, and the actual pressure ;

[0079] is the slope derivative of the structure's inner wall at different heights, describing the effect of local curvature on surface area gain and fluid shear rate; is the heat flux function per unit area at the axial position, which can be obtained by the actual heat flux sensor; For unit area at location The local thermal resistance function at , characterizes the heat transfer difficulty of the heat exchange interface under turbulence and structural deformation; is the total height of the heat dissipation wall 6 in the axial direction, which determines the integral range and the total design length of the structural segment;

[0080] In this embodiment: Wherein, in the above formula is a piecewise continuous function composed of formulas (#1), (#2) and (#3), specifically:

[0081] ; (#5)

[0082] Among them, among them, The inner wall along the axial direction The radius function in the direction is a continuous function composed of three structural segment functions in intervals: In the entrance section hour, is an exponential shrinkage function when In the middle sinusoidal disturbance segment hour, is the sinusoidal perturbation function when In the export segment hour, Deriving functions for parabolas , the first-order derivative of the above splicing function is continuous in its domain, as Main integral function The structural input item in is used to represent the effect of wall curvature changes on heat transfer performance;

[0083] The detailed formula of this embodiment is demonstrated below, so that the improvement of the heat dissipation efficiency of the heat dissipation wall 6 can be intuitively felt:

[0084] In this embodiment, the structural parameters are set as:

[0085] entrance radius mm, contraction index coefficient m , average radius of the sinusoidal disturbance segment mm, amplitude mm, wave number ,Phase , splicing point mm, mm, derived segment coefficient , calculated connection value mm, total length of the structure mm, the thermal performance index per unit time is calculated by numerical integration W, compared with the traditional straight wall structure ( W), the design of the heat dissipation wall 6 in this embodiment improves the heat exchange efficiency by about 37.796;

[0086] like Figure 1-4 As shown, the inner wall surface corresponding to the sinusoidal disturbance section of the heat dissipation wall 6 is provided with a plurality of spirally arranged micro-grooves, each groove having a pitch of 10 to 20 mm and a depth of 0.3 to 1 mm, and the disturbance function parameters satisfy , used to enhance boundary layer disturbance and improve heat transfer between gas and curved surface;

[0087] In this embodiment, the micro-groove spoiler structure can be formed on the inner wall of aluminum alloy or stainless steel by laser etching or CNC processing, or can be generated in one piece by CAD modeling during the 3D printing additive manufacturing stage;

[0088] The micro-groove turbulence structure can break the laminar flow characteristics of the near-wall airflow and induce a micro-scale vortex structure. It can superimpose a secondary disturbance mechanism on the main disturbance of the sinusoidal disturbance, thereby effectively improving the energy exchange efficiency of the boundary layer and significantly enhancing the heat transfer flux density between the near-wall gas and the curved surface.

[0089] Furthermore, the micro-groove turbulence structure can also reduce heat accumulation in local hot spots. The airflow sweeping effect formed by the spiral disturbance can also make the temperature distribution on the inner wall more uniform, thereby reducing the peak temperature difference in the hot zone, thereby improving the thermal field stability and heat exchange uniformity of the entire heat dissipation wall 6 during the heat dissipation process.

[0090] We further limit this to the axial interval corresponding to the sinusoidal disturbance segment. mm The inner wall surface of the 20 mm (1.5 mm) is provided with a plurality of micro-grooves distributed in a spiral shape along the axial direction, wherein the pitch of each groove is set to 15 mm, the depth is 0.5 mm, and the width is 1 mm, and is evenly distributed in three circles with the axial direction as the center;

[0091] The perturbation function is set to =2mm, wave number , thus satisfying , used to stimulate stable turbulence and suppress turbulent separation. The thermal performance simulation results show that compared with the structure with only a sinusoidal perturbation surface, the average improvement of the heat transfer capacity per unit area can reach about 15% through the setting of the micro-groove turbulence structure in this embodiment. The structure can be processed and formed by laser etching or 3D printing integrated manufacturing methods.

[0092] like Figure 1-4 As shown, the three-segment radius function At the splicing point 、 Not only is the function value continuous, but its first-order derivative also satisfies:

[0093] (#6).

[0094] It is used to ensure that the change of structural curvature has smooth continuity during physical processing and airflow guidance, and to ensure stable transition characteristics during heat field conduction;

[0095] In this embodiment, for the three-segment radius function The definitions of are as follows:

[0096] Exponential contraction segment:

[0097] ;

[0098] Sinusoidal disturbance segment:

[0099] ;

[0100] Parabolic lead-out section:

[0101] ;

[0102] To ensure the continuity of the derivative, Settings:

[0103] ;

[0104] exist Settings:

[0105] ;

[0106] By setting the continuity of the derivative of the above function, the curvature of the structure forms a geometrically continuous and tangentially consistent flow channel at the splicing point, effectively avoiding the local flow velocity disorder, flow field backflow or thermal stress concentration problems caused by structural mutations. At the same time, the continuity of the derivative facilitates the smooth tool path control in the CNC manufacturing process, thereby improving the processing accuracy and the balance of structural heat conduction, thereby ensuring the thermal performance calculation formula. No discontinuous jumps occur.

[0107] like Figure 1-4 As shown, the thermal resistance function Function of local wall thickness of the structure and thermal conductivity of the inner wall material Satisfies the following relationship:

[0108] ; (#7)

[0109] in In the axial direction The structural wall thickness variation function is defined as:

[0110] ; (#8)

[0111] in, is the average wall thickness of the sinusoidal disturbance section; is the fluctuation modulation amplitude, that is, the maximum deviation;

[0112] By constructing the minimum thermal resistance control area in the sinusoidal disturbance section, the heat flux per unit time is increased;

[0113] In this embodiment, in order to construct a local thermal resistance control area of ​​the structure and improve the heat flux efficiency per unit area in the sinusoidal disturbance section, the thermal resistance function It is no longer a fixed constant, but is defined as a function that varies with the axial direction;

[0114] The structural thermal resistance control area is limited to the axial range corresponding to the sinusoidal disturbance section [30mm, 70mm]. In this area, the wall thickness function Defined as: Its maximum value of 4mm occurs at z=30mm and z=70mm, and its minimum value of 2mm occurs at the center z=50mm. The wall thickness of the lead-in and lead-out structural areas outside this range is a constant value or a linear transition section, and is not involved in the thermal resistance function modeling process.

[0115] To ensure the physical continuity of thermal conductivity and wall thickness between the thermal resistance control section and its front and rear inlet and outlet sections, a 5mm long transition zone can be set near z=30mm and z=70mm, and a linear wall thickness gradient structure can be adopted to ensure its manufacturing feasibility and heat transfer stability.

[0116] This forms a thermal resistance control distribution with minimum thermal resistance in the middle and slow-release heat conduction at both ends, which is beneficial to improving the heat flux density in the middle sinusoidal disturbance section and enhancing the local heat exchange capacity.

[0117] In the above, by introducing the wall thickness function based on cosine control , so that the thermal resistance function It becomes a distributed parameter driven by both structural shape and material properties, thereby constructing a dynamic heat path structure with strong heat exchange in the center and slow-release conduction at the ends, thus having high engineering feasibility in structural manufacturing, thermal control and performance adjustment.

[0118] like Figure 1-4 As shown, the heat dissipation fins 5 are arranged and installed along the axial direction of the heat dissipation wall 6, the roots of the heat dissipation fins 5 are in contact with the outer wall of the heat dissipation wall 6, and the installation angle of the heat dissipation fins 5 is Satisfies the following functional relationship:

[0119] ; (#9)

[0120] in, Axial position The angle function between the heat sink fin 5 and the tangent direction of the outer wall of the cooling box 2 is used to construct the alignment relationship between the heat sink fin 5 and the local tangent of the outer wall of the heat sink 6; thereby achieving heat along the thermal resistance function The shortest conduction path of the smallest section is derived to improve the overall heat release efficiency of the structure and the heat transfer balance of the outer wall;

[0121] In this embodiment, wherein:

[0122] , the unit is radian. If converted to angle unit, the value range is (-90°, 90°), which represents the direction in which the outer wall of the structure tilts outward at this point;

[0123] The optimal normal deflection angle at which the fins should be installed is used to fit the tangent direction of the structure's outer surface to ensure the shortest path for heat flux conduction;

[0124] If the outer wall of a certain area changes dramatically, When it approaches the extreme value, the fin inclination angle is the largest, and the structure should be strengthened;

[0125] In the middle of the sinusoidal disturbance segment, Usually it is the positive and negative alternating change area, which is the angle modulation sensitive area;

[0126] We substitute a set of structural parameters for calculation, where , , , , , , , , assuming the heat dissipation wall 6 height is 100mm, it can be seen that in the middle area ( ) at an angle , is the mounting angle area where the outer wall of the heat dissipation wall 6 is closest to being smooth and most conducive to heat release, and and In the region, the angles are 7.8° and -3.5°, corresponding to the area where the curvature of the structural wall changes dramatically;

[0127] It should be noted that the actual manufacturing method of the heat dissipation fin 5 is: A CAD three-dimensional modeling system is introduced, and the normal mounting angle of each heat sink fin 5 is defined by a function-driven method. Then, the angle positioning of the fin on the mounting base is realized by CNC or a matching contour surface is directly generated during 3D printing to ensure that each fin is tangent to the tangent direction of its corresponding structural position.

[0128] To enhance the heat flux responsiveness, the thermal resistance function Minimum segment and The density of fins in the smallest area can be increased to 1.5 times that of other sections to match the conduction path with high heat flux in this section, and the angle function can be used to adjust the heat flux. The continuity of the fins controls the angle transition between them, forming a "thermal funnel" structure, so that the heat conduction path can be quickly connected from the internal heat flow high point to the strongest heat generation section of the heat sink fins;

[0129] It is necessary to explain each character in the formula:

[0130] The axial position of the heat sink fins The best installation angle at is the current structural axial position, in mm, and is the axial distance of the structural heat dissipation wall 6 along the main flow direction; is the initial outer contour radius of the exponential contraction segment; It represents the shrinkage rate of the airflow channel, which is the attenuation coefficient of the exponential shrinkage function; is the radius amplitude of the sinusoidal disturbance segment; is the initial phase of the sinusoidal disturbance segment, which determines the disturbance position offset; is the quadratic coefficient of the parabola derived segment; is a linear coefficient, and the two together with the constant term determine the contour morphology of the end of the structure; is the center of symmetry of the parabola.

[0131] like Figure 1-4 As shown, the layout density of the heat sink fins 5 is and thermal resistance function Satisfies the following functional relationship:

[0132] ; (#10)

[0133] in, Axial position The heat dissipation fin 5 layout density at is the minimum layout density lower limit, is the density response coefficient, is the maximum thermal resistance in the structure, and γ is the response enhancement coefficient, which is used to form an enhanced structural layout mechanism in which the fin density is concentrated in the thermal resistance extreme area;

[0134] In this embodiment, The calculation method is:

[0135]

[0136] in, At the point of minimum thermal resistance The maximum deployment density when Obtained through experiments or simulation adjustments;

[0137] The preferred range of (#10)γ in this formula is 1.5–2.5, which is used to enhance the density adjustment sensitivity of the section with the minimum thermal resistance, so that the fins form a high-density structure in this area to respond to the maximum heat flux release demand.

[0138] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0139] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. An oil-free air compressor with high cooling performance, characterized in that: include: An air compressor body (1), wherein a cooling box (2) is installed on the top of the air compressor body (1), an air outlet guide cover (3) is installed on the surface of the cooling box (2), a connecting mounting seat (7) is installed at the connection between the cooling box (2) and the air compressor body (1), an air cooling mounting shaft (4) is installed inside the air outlet guide cover (3) close to the cooling box (2), a first air cooling mounting seat (8) is sleeved on the surface of the air cooling mounting shaft (4), and a heat dissipation air cooling (9) is installed on the surface of the first air cooling mounting seat (8); A heat dissipation wall (6), the heat dissipation wall (6) being installed inside the cooling box (2), and heat dissipation fins (5) being installed on the surface of the heat dissipation wall (6); A ventilation wall (13), the ventilation wall (13) is designed in a wave-like manner and is installed inside the air-cooling mounting shaft (4); a second air-cooling mounting seat (10) is installed on the surface of the air-cooling mounting shaft (4); a third air-cooling mounting seat (11) is installed below the second air-cooling mounting seat (10); the third air-cooling mounting seat (11) and the second air-cooling mounting seat (10) are connected to the surface of the air-cooling mounting shaft (4) in the same manner; and a bottom air outlet block (12) is installed at the bottom of the air-cooling mounting shaft (4); The cross-sectional shape of the heat dissipation wall (6) is a curved surface designed with a flow disturbance function, and the heat dissipation wall (6) is axially It is a continuously differentiable piecewise composite curvature structure, whose radius function is composed of three structure functions, including: exponential contraction segment, sinusoidal perturbation segment, and parabolic derivation segment. The heat exchange performance index per unit time of the cooling box (2) is calculated by the following integral formula: 。 2. The oil-free air compressor with high cooling performance according to claim 1, characterized in that: The inner wall surface corresponding to the sinusoidal disturbance section of the heat dissipation wall (6) is provided with a plurality of micro-groove disturbance structures arranged in a spiral shape, which are used to strengthen the boundary layer disturbance and improve the heat exchange capacity between the gas and the curved surface.

3. The oil-free air compressor with high cooling performance according to claim 2, characterized in that: The radius function described in the three sections At the splicing point 、 Not only is the function value continuous, but its first-order derivative also satisfies: ； It is used to ensure that the changes in structural curvature are smooth and continuous during physical processing and airflow guidance, and to ensure stable transition characteristics during heat field conduction.

4. The oil-free air compressor with high cooling performance according to claim 3, characterized in that: Thermal resistance function Function of local wall thickness of the structure and thermal conductivity of the inner wall material Satisfies the following relationship: ； in In the axial direction The structural wall thickness variation function is defined as: ； The minimum thermal resistance control zone is constructed in the sinusoidal disturbance section to increase the heat flux per unit time.

5. The oil-free air compressor with high cooling performance according to claim 4, characterized in that: The heat dissipation fins (5) are arranged and installed along the axial direction of the heat dissipation wall (6), the roots of the heat dissipation fins (5) are in contact with the outer wall of the heat dissipation wall (6), and the installation angle of the heat dissipation fins (5) is Satisfies the following functional relationship: ； in, Axial position A function of the angle between the heat dissipation fin (5) and the tangent direction of the outer wall of the cooling box (2).

6. The oil-free air compressor with high cooling performance according to claim 5, characterized in that: The layout density of the heat dissipation fins (5) With the thermal resistance function Satisfies the following functional relationship: ； in, Axial position The heat dissipation fins (5) are arranged at a density of is the minimum layout density lower limit, is the density response coefficient, is the maximum thermal resistance in the structure, In response to the enhancement coefficient, a reinforced structural layout mechanism is formed to concentrate the fin density in the thermal resistance area.

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