Machine tool liquid cooling heat dissipation device based on Tesla valve principle and interpolation turbulent flow

Abstract

The invention discloses a machine tool liquid cooling heat dissipation device based on a Tesla valve principle and interpolation turbulent flow. The machine tool liquid cooling heat dissipation device comprises a base plate, interpolation turbulent flow units and a cover plate. An inlet groove, an outlet groove and a plurality of parallel main flow channels are formed in the base plate, and the main flow channels are located between the inlet groove and the outlet groove and communicate with the inlet groove and the outlet groove; a working medium circulating inlet and a working medium circulating outlet are respectively formed in the inlet groove and the outlet groove; a plurality of pairs of auxiliary flow channels are arranged in each main flow channel, mounting grooves are symmetrically formed in each pair of auxiliary flow channels, and interpolation type turbulent flow units are detachably mounted in the mounting grooves; each main runner and an auxiliary runner arranged in the main runner jointly form a Tesla valve structure; the cover plate is fixed to the base plate and carries a heat source, heat of the heat source is distributed on the cover plate, sealed Tesla valve structures are formed between the base plate and the cover plate to provide circulation channels for heat exchange working media, and cooling liquid in the Tesla valve structures circularly flows to achieve cooling.

Description

Technical Field

[0001] The invention belongs to the technical field of heat dissipation devices, and in particular relates to a machine tool liquid cooling heat dissipation device based on the Tesla valve principle and an interpolated turbulent flow. Background Art

[0002] With the continuous development of the precision machine tool industry, the requirements for machine tool accuracy are getting higher and higher. The heat generated by external heat sources, spindles, and machine tool feed systems causes thermal deformation of the machine tool structure through conduction, convection, and radiation, which in turn causes changes in the relative posture between the tool and the workpiece. Active thermal control, as a method of thermal management for machine tools, minimizes the impact of heat from the heat source on the machine tool structure by reasonably actively controlling the heat source. As an important carrier of the circulating cooling system of CNC machine tools, the flow state and heat exchange performance of the liquid-cooled temperature control board will be directly related to the processing accuracy of the final parts.

[0003] The Tesla valve has the effect of enhancing heat exchange mainly due to the mixing and collision of the fluid inside it. For example, Chinese patent document CN 115397195A discloses a Tesla valve microchannel radiator, which adopts parallel arrangement of rectangular cross-section flow channels, and arranges reverse and forward Tesla valve structures at the inlet and outlet respectively, thereby improving the uniformity of temperature distribution on the heat source surface of the radiator;

[0004] For example, Chinese patent document CN 221634279 U discloses a radiator based on a Tesla valve structure. By arranging cooling fins arranged according to the Tesla valve structure on a temperature control unit, the flow rate of the airflow flowing into the radiator is increased, the contact area between the airflow and the cooling fins is increased, and sufficient heat exchange is carried out between the airflow and the cooling fins, thereby achieving the effect of enhancing the heat dissipation performance.

[0005] Although the existing temperature control plate design improves the heat exchange capacity to a certain extent, it still has the following problems: 1. Due to the existence of the temperature boundary layer, the cooling medium can only absorb a small amount of heat from the heat exchange surface in the temperature control plate. 2. The existing temperature control plate enhanced heat exchange structure is relatively complex and the processing and manufacturing cost is high. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a machine tool liquid cooling device based on the Tesla valve principle and interpolated turbulence.

[0007] The objective of the present invention is achieved through the following technical solutions:

[0008] A machine tool liquid cooling device based on the Tesla valve principle and an interpolated spoiler comprises a base plate, an interpolated spoiler unit and a cover plate; the base plate is provided with an inlet slot, an outlet slot and a plurality of parallel main channels, the main channels are located between the inlet slot and the outlet slot and are connected to the inlet slot and the outlet slot; the inlet slot and the outlet slot are respectively provided with a working fluid circulation inlet and a working fluid circulation outlet;

[0009] A plurality of pairs of auxiliary flow channels are provided in each main flow channel, and mounting grooves are symmetrically provided on each pair of auxiliary flow channels, and the internal plug-in spoiler unit is detachably installed in the mounting groove;

[0010] Each main flow channel and the auxiliary flow channel arranged in the main flow channel together form a Tesla valve structure;

[0011] The cover plate is fixed on the base plate and carries a heat source. The heat of the heat source is distributed on the cover plate. A sealed Tesla valve structure is formed between the base plate and the cover plate to provide a circulation channel for the heat exchange medium. Cooling is achieved by circulating the coolant in each Tesla valve structure.

[0012] Furthermore, the substrate and cover plate are both rectangular structures, the inlet groove and the outlet groove are symmetrically arranged at both ends of the substrate in the length direction, and the cross-section of the inlet groove and the outlet groove is a polygonal structure; the main channel is perpendicular to the length direction of the inlet groove and the outlet groove.

[0013] Furthermore, the inclination angle formed between the central axis of the auxiliary flow channel and the central axis of the main flow channel is 30° to 40°.

[0014] Furthermore, the main channels are arranged in a staggered manner to save space.

[0015] Furthermore, each pair of auxiliary flow channels in each main flow channel is symmetrically arranged or offset, and the axis of symmetry in the symmetrical arrangement is the central axis of the corresponding main flow channel.

[0016] Furthermore, the depths of the inlet groove, the outlet groove, the main flow channel and the auxiliary flow channel are all the same.

[0017] Furthermore, the plug-in spoiler unit is composed of a fixing device and a spoiler device, the fixing device includes two mounting plates that match the shape of the mounting groove, the spoiler device is fixed between the mounting plates, the spoiler device is a columnar structure, the cross-section of the columnar structure is regular or irregular, and the spoiler device is used to disturb the heat exchange medium and enhance the heat exchange effect.

[0018] Furthermore, the width of the main flow channel and the auxiliary flow channel are both 3-7 mm, and the depth is 12-18 mm.

[0019] Furthermore, the flow direction of the heat exchange medium in the main channel is a unidirectional flow from the inlet groove direction to the outlet groove direction.

[0020] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0021] 1. Significantly improve heat dissipation performance: The liquid cooling device of the machine tool effectively increases the turbulence effect of the cooling medium through the design of the Tesla valve structure, and significantly strengthens the mixing and impact of the fluid. Compared with the traditional design, it can more efficiently destroy the temperature boundary layer, so that the heat exchange medium is in full contact with the heat source surface, thereby improving the heat exchange efficiency.

[0022] In addition, the embodiment adopts a Tesla-like 4-stage series structure, and increases the residence time of the heat exchange medium in the flow channel by designing a 60% offset layout of the auxiliary flow channel. Combined with the design of the water droplet-shaped cross-section spoiler unit, compared with the heat sink with a traditional curved flow channel structure, the average temperature of the heat load cover plate is reduced by 7.9K, and the Nusselt number (Nu) is increased to 1.51 times, and the heat dissipation performance is significantly enhanced.

[0023] 2. Improve temperature uniformity: The present invention uses the Tesla valve principle to optimize the fluid flow path, making the temperature distribution in the flow channel of the heat dissipation device more uniform, effectively avoiding local overheating, improving the stability of thermal management, and helping to maintain the machining accuracy of machine tools.

[0024] 3. Modular design facilitates maintenance: Through the design of the plug-in spoiler unit, the heat dissipation device realizes modular disassembly and assembly of the spoiler device in the flow channel, which is convenient for later maintenance, replacement and cleaning, extending the service life of the equipment while reducing operating costs.

[0025] 4. Reduce processing and manufacturing difficulty and cost: Compared with the traditional complex enhanced heat exchange structure, the heat dissipation device adopts regular geometric flow channels and detachable component design, which greatly simplifies the manufacturing process, reduces processing accuracy requirements and manufacturing costs, and is suitable for large-scale industrial applications.

[0026] 5. Compact layout saves space: The staggered layout design of the main channel and the auxiliary channel makes the overall structure more compact, reduces the space occupied by the equipment without sacrificing the heat exchange performance, and facilitates the integration of the machine tool cooling device.

[0027] 6 Flexible applicability: The optimized design of flow channel width and depth takes into account the balance between flow resistance and heat exchange efficiency, can adapt to the flow characteristics of different cooling media, and has a wide range of applicability; and the base plate and spoiler unit design can be flexibly replaced according to the heat dissipation requirements of different parts of the machine tool structure. For example, the optimized design of different inclination angles and flow channel arrangements meets the heat dissipation power requirements of specific parts, and has strong adaptability.

[0028] 7. Energy saving and economy: The heat dissipation device of the present invention can reduce the overall flow resistance of the heat exchange medium and further enhance the heat exchange effect, thereby improving energy utilization and making it more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of a heat dissipation device according to a first embodiment of the present invention;

[0030] Figure 2 , Figure 3 , Figure 4 They are schematic diagrams of the structures of the substrate, the internal spoiler unit and the cover plate in the first embodiment;

[0031] Figure 5 A schematic diagram of the structure of a liquid cooling heat sink using a curved channel type;

[0032] Figure 6 A schematic diagram of the structure of a heat sink using a Tesla valve without an internal spoiler unit;

[0033] Figure 7 A schematic diagram of the structure of a heat dissipation device according to a second embodiment of the present invention;

[0034] Figure 8 , Fig. 9 They are respectively the flow direction of the heat transfer medium and the schematic diagram of the enhanced heat transfer principle.

[0035] Reference numerals: 1-working fluid circulation inlet, 2-inlet groove, 3-installation groove, 4-auxiliary flow channel, 5-main flow channel, 6-outlet groove, 7-working fluid circulation outlet, 8-fixing device, 9-disturbing device, 10-heat load surface, 11-combination surface DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] Embodiment 1

[0038] See Figure 1 The machine tool liquid cooling device based on the Tesla valve principle and the plug-in spoiler of this embodiment includes a substrate, a cover plate and an plug-in spoiler unit as main components; the substrate and the cover plate are both rectangular parallelepiped structures, wherein the substrate and the plug-in spoiler unit are machined and formed by aluminum alloy materials, and the cover plate material is made of copper. The plug-in spoiler unit is fixed with the mounting groove 3 on the side wall of the main flow channel of the substrate through its own rectangular cross-section fixing device 8, and the cover plate is fixed on the substrate, forming a sealed flow channel structure between the substrate and the cover plate for the heat exchange medium to circulate.

[0039] See Figure 2An inlet groove 2, an outlet groove 6 and four parallel main channels 5 are provided on the substrate, the main channels 5 are located between the inlet groove 2 and the outlet groove 6 and are connected with the inlet groove 2 and the outlet groove 6; a working fluid circulation inlet 1 and a working fluid circulation outlet 7 are respectively provided in the inlet groove 2 and the outlet groove 6; in this embodiment, 5 pairs of auxiliary channels are provided in each main channel, and each pair of auxiliary channels is symmetrically provided with mounting grooves 3, and a plug-in spoiler unit is detachably installed in the mounting groove; each main channel and the auxiliary channels arranged in the main channel together form a Tesla valve structure.

[0040] The inlet groove 2 and the outlet groove 6 are symmetrically arranged at both ends of the substrate in the length direction, and the cross-sections of the inlet groove 2 and the outlet groove 6 are polygonal structures; the main channel 5 is perpendicular to the length direction of the inlet groove 2 and the outlet groove 2. The depths of the inlet groove 2, the outlet groove 6, the main channel 5 and the auxiliary channel 4 are the same.

[0041] In this embodiment, the length of the substrate is 210 mm, the width is 122 mm, and the height is 20 mm. The inclination angle formed between the central axis of the auxiliary flow channel 4 and the central axis of the main flow channel 5 is 35°. The width of the main flow channel 5 and the auxiliary flow channel 6 are both 5 mm, and the depth is 15 mm. A total of four main flow channels 5 are arranged on the substrate, and the main flow channels are staggered with each other to save space. The flow direction of the heat exchange medium in the main flow channel is a unidirectional flow from the inlet groove direction to the outlet groove direction.

[0042] See Figure 3 The plug-in spoiler unit is composed of a fixing device 8 and a spoiler device 9. The fixing device 8 includes two mounting plates that match the shape of the mounting groove 3. The spoiler device 9 is fixed between the mounting plates. The spoiler device 9 is a columnar structure with a polygonal, circular or irregular cross-sectional shape. The cross-sectional direction is perpendicular to the main flow direction of the heat exchange medium, which is used to disturb the heat exchange medium and enhance the heat exchange effect.

[0043] In this embodiment, the spoiler is a cylinder with a cross-section of 6 mm in diameter and 5 mm in height, and the mounting plate is a cuboid with a cross-section of 6 mm in length, 8 mm in width and 1 mm in height.

[0044] See Figure 4 The lower surface of the cover plate is a bonding surface 11, and the upper surface is a heat-carrying surface 10. The bonding surface 11 is fixed to the upper surface of the substrate, so that a sealed Tesla valve flow channel structure is formed between the cover plate and the substrate to provide a circulation channel for the heat exchange medium. The heat-carrying surface 10 is loaded with a heat source generated by the heat generated when the precision machine tool is working. The heat generated by the heat source is distributed on the surface, and the heat is absorbed by the heat exchange medium circulating between the liquid cooling plates.

[0045] In this embodiment, the length and width of the cover plate are equal to those of the base plate, the height is 5 mm, and the heat flux density of the heat source applied to the heat load surface 10 of the cover plate is 2 W / cm 2,The heat exchange medium used in this implementation is spindle oil, with a flow rate of 5L / min and a temperature of 20℃. ,The cooling is achieved by circulating the heat exchange medium in the flow channel of the ,substrate.

[0046] The results of thermal-fluid-solid coupling simulation are shown in Table 1. Compared with the simulation results under the same boundary conditions, Figure 5 The comparative example 1 using the conventional curved channel heat dissipation structure shown in FIG. Figure 6 In the comparative example 2 using a Tesla-like valve structure without an inserted spoiler unit, the average temperature of the heat load surface of the cover plate of the heat dissipation device of the example 1 is reduced by 8.6K and 3.1K respectively, and the ratio of the average Nusselt number Nu of the temperature control system is 1.58 and 1.11 respectively, reflecting the better heat exchange capacity of the example 1.

[0047] Embodiment 2

[0048] See Figure 7 The main structure of the heat dissipation device in this embodiment is basically similar to that of the first embodiment, and the difference lies in the structure of the substrate and the spoiler unit used in this example. In this embodiment, four pairs of auxiliary flow channels 5 are provided in each main flow channel 5 in the substrate, and each pair of auxiliary flow channels 5 is offset, and the inclination angle formed between the central axis of the auxiliary flow channel 4 and the central axis of the main flow channel 5 is 30°, and the main flow channels are still arranged in a staggered manner. The spoiler device of the inserted spoiler unit in this embodiment adopts a teardrop-shaped cross-section structure, forms a certain inclination angle with the flow direction of the main flow channel fluid, and is arranged in the main flow channel.

[0049] By replacing the structures of the substrate and the spoiler unit similar to the present embodiment, it is possible to match different heat dissipation power requirements at different positions of the machine tool heat dissipation system.

[0050] The results of thermal-fluid-solid coupling simulation are shown in Table 1. Compared with the simulation results under the same boundary conditions, Figure 5 The comparative example using the conventional curved channel heat dissipation structure shown in FIG. Figure 6 In the comparative example 2 using a Tesla-like valve structure without an inserted spoiler unit, the average temperatures of the heat load surfaces of the cover plate of the heat dissipation device of the second example were reduced by 7.9K and 2.44K, respectively, and the ratios of the average Nusselt numbers Nu of the temperature control system were 1.51 and 1.06, respectively.

[0051] In this embodiment, the inserted water droplet-shaped spoiler unit destroys the fluid thermal boundary layer and increases the fluid turbulence intensity, effectively improving the low-temperature gradient fluid distribution in the central area of ​​the flow channel and guiding it to the high-temperature gradient boundary area. This design significantly enhances the heat convection heat transfer capacity and achieves uniform and efficient heat exchange in the flow channel.

[0052] Table 1 Thermal-fluid-solid coupling simulation results

[0053]

[0054] Compared with the traditional single-channel heat sink, the present invention has a stronger heat exchange capacity. Figure 8 , Fig. 9 As shown, taking Example 1 as an example, the principle of enhanced heat exchange is as follows: 1. When the heat exchange medium passes through the flow channel structure of the Tesla valve-like structure on the substrate, the resistance of the main flow channel is increased due to the existence of the auxiliary flow channel reflux, which extends the heat exchange time of the fluid in the flow channel and increases the heat exchange amount; 2. Due to the existence of the plug-in heat exchange unit, the thermal boundary layer of the fluid is destroyed, the turbulent intensity of the flow field is increased, and at the same time, the fluid in the low temperature gradient area in the central area of ​​the flow channel flow field is guided to the high temperature gradient at the boundary, thereby enhancing the influence of thermal convection.

[0055] Compared with the traditional single-channel heat sink, another advantage of the present invention is that the base plate and the plug-in spoiler unit can be replaced according to the different needs of heat dissipation capacity at different positions on the machine tool structure, and the cross-section of the spoiler unit can be optimized by structural optimization, topological optimization and other methods to obtain stronger enhanced heat exchange capacity under lower flow resistance. It has a wide range of applications, the required structure is relatively simple, and the processing and manufacturing cost is low.

[0056] The present invention is not limited to the embodiments described above. The above description of the specific embodiments is intended to describe and illustrate the technical solution of the present invention. The above specific embodiments are merely illustrative and not restrictive. Without departing from the scope of the present invention and the scope of protection of the claims, a person of ordinary skill in the art can also make many forms of specific changes under the guidance of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A machine tool liquid cooling device based on the Tesla valve principle and interpolated turbulence, characterized in that: It comprises a base plate, an insert-type spoiler unit and a cover plate; the base plate is provided with an inlet slot, an outlet slot and a plurality of parallel main channels, the main channels are located between the inlet slot and the outlet slot and are connected with the inlet slot and the outlet slot; the inlet slot and the outlet slot are respectively provided with a working medium circulation inlet and a working medium circulation outlet; A plurality of pairs of auxiliary flow channels are provided in each main flow channel, and mounting grooves are symmetrically provided on each pair of auxiliary flow channels, and the internal plug-in spoiler unit is detachably installed in the mounting groove; Each main flow channel and the auxiliary flow channel arranged in the main flow channel together form a Tesla valve structure; The cover plate is fixed on the base plate and carries a heat source. The heat of the heat source is distributed on the cover plate. A sealed Tesla valve structure is formed between the base plate and the cover plate to provide a circulation channel for the heat exchange medium. Cooling is achieved by circulating the coolant in each Tesla valve structure.

2. According to claim 1, a machine tool liquid cooling device based on the Tesla valve principle and the interpolated turbulent flow is characterized in that: The base plate and the cover plate are both rectangular structures, the inlet groove and the outlet groove are symmetrically arranged at both ends of the base plate in the length direction, and the cross-section of the inlet groove and the outlet groove is a polygonal structure; the main channel is perpendicular to the length direction of the inlet groove and the outlet groove.

3. According to claim 1, a machine tool liquid cooling and heat dissipation device based on the Tesla valve principle and the interpolated turbulence is characterized in that: The inclination angle formed between the central axis of the auxiliary flow channel and the central axis of the main flow channel is 30° to 40°.

4. According to claim 1, a machine tool liquid cooling device based on the Tesla valve principle and the interpolated turbulent flow is characterized in that: The main channels are staggered to save space.

5. According to claim 1, a machine tool liquid cooling and heat dissipation device based on the Tesla valve principle and the interpolated turbulence, characterized in that: Each pair of auxiliary flow channels in each main flow channel is arranged symmetrically or offset, and the axis of symmetry in the symmetrical arrangement is the central axis of the corresponding main flow channel.

6. According to claim 1, a machine tool liquid cooling device based on the Tesla valve principle and the interpolated turbulent flow is characterized in that: The depths of the inlet groove, outlet groove, main channel and auxiliary channel are all the same.

7. According to claim 1, a machine tool liquid cooling device based on the Tesla valve principle and the interpolated turbulent flow is characterized in that: The plug-in spoiler unit consists of a fixing device and a spoiler device. The fixing device includes two mounting plates that match the shape of the mounting groove. The spoiler device is fixed between the mounting plates. The spoiler device is a columnar structure. The cross-section of the columnar structure is regular or irregular. The spoiler device is used to disturb the heat exchange medium and enhance the heat exchange effect.

8. A machine tool liquid cooling device based on the Tesla valve principle and interpolated turbulence according to claim 1 or 6, characterized in that: The width of the main flow channel and the auxiliary flow channel are both 3-7 mm, and the depth is 12-18 mm.

9. According to claim 1, a machine tool liquid cooling and heat dissipation device based on the Tesla valve principle and the interpolated turbulence, characterized in that: The flow direction of the heat exchange medium in the main channel is a unidirectional flow from the inlet groove direction to the outlet groove direction.

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