CN115922581A - Phase-change heat storage composite superhard abrasive grinding wheel - Google Patents
Phase-change heat storage composite superhard abrasive grinding wheel Download PDFInfo
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Abstract
The invention provides a phase-change heat-storage composite superhard abrasive grinding wheel which comprises a grinding wheel base body and abrasive materials arranged on the periphery of the grinding wheel base body, wherein an annular tube cavity is arranged in the area close to the outer end of the grinding wheel base body, heat dissipation fins are arranged in the annular tube cavity, the inner ends and two side ends of the heat dissipation fins are in contact with the grinding wheel base body, the outer ends of the heat dissipation fins extend towards the outer wall surface of the annular tube cavity but are not in contact with the outer wall surface of the annular tube cavity, a layer of foam metal is arranged on the outer wall surface of the annular tube cavity, and working media are injected into the annular tube cavity. The phase-change heat storage composite superhard abrasive grinding wheel has the advantages of high heat transfer coefficient, large heat capacity, good structural strength and capability of effectively regulating and controlling the temperature of a grinding arc area.
Description
Technical Field
The invention relates to the technical field of grinding wheels, in particular to a phase-change heat storage composite superhard abrasive grinding wheel.
Background
During efficient grinding, high grinding temperature is easy to occur and heat damage such as surface residual stress, deteriorated layers, microcracks and the like is caused on the surface of a workpiece. In order to cool down a workpiece in time, increasing the usage amount of grinding fluid and the jet flow speed are the main methods for inhibiting grinding burn and improving the grinding efficiency at present. However, the negative problems of production cost, environmental pollution, and human health caused by the use of a large amount of grinding fluid have not been ignored.
In recent years, people begin to improve the thermal property of a grinding wheel tool, and try to enhance the heat exchange effect of the grinding wheel on an arc area in the grinding process by improving the heat conduction property and the heat capacity of the grinding wheel tool, so that grinding heat can enter the grinding wheel more and is dredged out through the grinding wheel, and finally the temperature of the grinding arc area is reduced and the use of grinding fluid is reduced.
In one of the current research directions, a heat pipe is added in a base body of the grinding wheel, the heat conduction capability of the grinding wheel is improved through the phase change heat transfer effect of the heat pipe, and meanwhile, a heat storage material is added in the heat pipe, so that the heat capacity in the heat pipe is improved.
For example, in the patent of patent application No. CN201610865211.0, entitled phase change heat storage grinding wheel for green dry grinding and its manufacturing method, a heat pipe is added in the grinding wheel, working medium is filled in the heat pipe, and an annular heat storage element is also added in the heat pipe, but the invention has the limitations that: the heat transfer distance in the heat pipe is long, the contact area of the vaporized working medium is small when the vaporized working medium is condensed on the surface of the heat storage element, and when the gas-liquid phase change heat transfer process is not smooth, the condensation heat exchange between the heat storage element and the vaporized working medium is insufficient, so that the heat transfer speed and the heat storage of the heat storage element are influenced; in addition, the structural strength of the grinding wheel is influenced due to the large space of the heat pipe. Colloquially, the practical problems encountered in applications are: when the grinding wheel is used for grinding, the working medium can be vaporized, but the motion path of the vaporized working medium is long, and meanwhile, the condensation area provided by the heat storage element is small, so that condensation and heat dissipation are insufficient, and heat transfer resistance can be increased, so that the heat transfer capacity of the grinding wheel and the dispersion of the heat of a grinding arc area are influenced.
In the patent with patent application number of CN201811635039.5 and the invention name of a novel high-heat-conduction phase-change heat-storage superhard abrasive grinding wheel and a preparation method thereof, the structure in a heat pipe is improved, a large amount of foam metal is filled in the heat pipe, and working medium is injected into an annular pipe cavity, so that the heat is transferred quickly and gradually to the inner end of the grinding wheel by utilizing the characteristics of large specific surface area and good trafficability of the foam metal.
In summary, they share the problems of: the heat conduction and heat capacity properties of the grinding wheel are greatly influenced by grinding conditions, the structural form of the grinding wheel, the phase-change heat transfer state of the working medium and other factors, and the grinding wheel cannot simultaneously give consideration to the improvement of two important thermal properties of heat conduction and heat capacity and ensure the stability in the grinding process.
Based on the above problems, it can be found that the heat capacity property of the grinding wheel is considered on the premise of improving the heat conductivity of the grinding wheel, which is the core and basic requirement for improving the thermal property of the grinding wheel, and is also the key for strengthening heat exchange of a grinding arc area by using the grinding wheel, reducing the grinding temperature and effectively regulating and controlling the grinding temperature.
In order to solve the above problems, people always seek an ideal technical solution.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a phase-change heat-storage composite superhard abrasive grinding wheel which is strong in heat transfer capacity, large in heat storage capacity, good in structural strength and capable of effectively controlling the temperature of a grinding arc area.
The basic design concept of the invention patent is as follows: firstly, the invention is based on the boiling/condensing heat transfer principle, has the characteristics of small heat exchange area, high heat transfer coefficient and small required heat transfer temperature difference, and has wide application and important position in the field of heat transfer enhancement at present. Secondly, for the convective heat transfer by gas/liquid two-phase conversion in a closed container, because the heat capacity of the phase-change heat transfer part is very small, once the container is accumulated with heat due to insufficient heat dissipation, the air pressure and the temperature in the container are easily and rapidly increased, the heat transfer performance is further influenced, and the temperature of the heat input end is difficult to be effectively controlled.
Based on the principle, the periphery of the grinding wheel base body is provided with a circle of sealed annular tube cavity, a thin layer of foam metal is laid on the outer wall surface of the annular tube cavity, and a proper amount of working medium with low boiling point is injected into the annular tube cavity, so that a boiling heat transfer basic structure is formed. In the grinding process, after grinding heat is transmitted into the grinding wheel, the micro-pore structure of the foam metal is utilized, the bubble nucleation process of the liquid working medium can be effectively promoted, and the working medium and the outer wall surface of the annular tube cavity can quickly enter a nucleation boiling state under the condition of keeping a small temperature difference; meanwhile, the radiating fins are filled in the annular tube cavity, the tail ends and two side end faces of the radiating fins are in contact with the grinding wheel base body, the outer ends of the radiating fins are close to foam metal, when the vaporized working medium moves towards the inner hole direction of the grinding wheel under the action of the driving force of air pressure difference, the radiating fins can be rapidly in contact with the radiating fins due to the fact that the distance between the radiating fins and the foam is close, meanwhile, the large surface area of the radiating fins can be used for ensuring that the vaporized working medium can be rapidly and fully condensed and radiated, then, the radiating fins further transmit the transmitted heat to the grinding wheel base body on the one hand, and carry out final radiation by means of convective heat transfer between the grinding wheel end faces and the surrounding environment, on the other hand, when the outward conduction of the heat of the grinding wheel is insufficient, the radiating fins can also temporarily store the heat through self temperature rise, and therefore the rapid change of the temperature of each position point in the heat transfer process is avoided. In addition, because the grinding wheel for constructing the annular tube cavity has more thin-wall structures, the radiating fins also play a role in supporting a reinforcing structure, and therefore the strength of the grinding wheel is improved and guaranteed.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a compound superhard abrasive material emery wheel of phase transition heat-retaining, includes grinding wheel base body and the abrasive material of locating grinding wheel base body periphery, grinding wheel base body's nearly outer end region is provided with annular tube chamber, install radiating fin in the annular tube chamber, radiating fin's the inner and both sides end contact grinding wheel base body, radiating fin's outer end extends but contactless to the outer wall of annular tube chamber, the outer wall of annular tube chamber sets up one deck foamed metal, working medium is injected into in the annular tube chamber.
Basically, the distance between the outer end of the radiating fin and the outer wall surface of the annular tube cavity is 10mm-30mm, and the thickness of the foam metal is 0.2mm-1.5mm.
Basically, the aperture of the foam metal is 20PPi-80PPi, and the through hole rate of the foam metal is higher than 95%.
Basically, the boiling point of the phase-change working medium is between 10 ℃ and 50 ℃.
Basically, the radiating fin comprises an annular main body and a circle of fins circumferentially arrayed outside the annular main body, and the radiating fin is of an integral structure.
Basically, the connection area of the radiating fin and the annular tube cavity is coated with high-heat-conductivity structural adhesive and is connected through heating, heat preservation and curing.
Basically, one side wall of the annular tube cavity is an annular end cover assembled on the grinding wheel base body, a liquid injection hole communicated with the annular tube cavity is formed in the grinding wheel base body, a sealing plug used for plugging the liquid injection hole is arranged in the grinding wheel base body, a through hole is formed in the heat dissipation fin corresponding to the liquid injection hole, and the diameter of the through hole is 2mm-3mm.
Basically, the foam metal is adhered to the outer wall surface of the annular tube cavity through structural adhesive.
Basically, the outer wall surface of the annular tube cavity is a smooth wall surface or an irregular wall surface, and when the distance between the outer end of the radiating fin and the outer wall surface of the annular tube cavity is calculated, the distance is changed by taking the outer wall surface of the position corresponding to the radiating fin as a reference, especially in the irregular wall surface.
Compared with the prior art, the invention has prominent substantive features and remarkable progress, and particularly has the following advantages:
1. design radiating fin in the annular tube chamber of emery wheel, radiating fin occupies most space and the surface area of annular tube chamber is big, based on unique fin structure, can enough realize being close to with annular tube chamber outer wall, can satisfy annular tube chamber's space needs again, after the working medium enters into the nuclear boiling heat transfer state, the vaporization working medium can be fast and abundant with radiating fin contact, thereby guarantee the condensation heat dissipation, because radiating fin itself has great heat capacity and high heat conductivity, it can also be very fast absorb and transmit the heat to the emery wheel base member, make the heat can be evacuated to the external environment through the emery wheel base member, so radiating fin can act as the effective cold junction of working medium boiling heat transfer, make the rapid condensation of vaporization working medium and flow back to the internal face of annular tube chamber excircle once more, this structure use can not be because of vaporization working medium condensation is not enough/not fully increase heat transfer thermal resistance, thereby influence emery wheel holistic heat transfer ability.
2. The outer wall surface of the annular tube cavity is provided with a layer of foam metal, the foam metal is not used for heat transfer, but the characteristic that the micropore structure of the foam metal is beneficial to bubble nucleation is utilized, so that the working medium can rapidly enter a nucleate boiling state, the characteristic of low boiling point of the working medium is combined, and under the condition of ensuring sufficient condensation heat dissipation, the liquid working medium and the outer wall surface of the annular tube cavity can enter a heat transfer cycle of vaporization nucleation, boiling, heat transfer, condensation, heat dissipation and condensation working medium backflow only by maintaining a small temperature difference, thereby improving and ensuring the heat transfer speed, and integrally improving the heat transfer capacity of the grinding wheel.
Drawings
Fig. 1 is a schematic view of the overall structure of the phase-change heat storage composite superabrasive grinding wheel of the present invention.
Fig. 2 is a partial structural sectional view of the phase change heat storage composite superabrasive grinding wheel of the present invention.
Fig. 3 is a partial cross-sectional view of a phase change heat storage composite superabrasive wheel of the present invention.
FIG. 4 is a schematic diagram of the heat transfer/storage operation of the phase-change heat storage composite superabrasive grinding wheel.
Fig. 5 is a schematic diagram of the convective heat transfer of the phase change heat storage composite superabrasive grinding wheel.
In the figure: 1. a grinding wheel base body; 2. an abrasive; 3. an annular lumen; 4. a heat dissipating fin; 5. a metal foam; 6. an annular end cap; 7. a liquid injection hole; 8. sealing the plug; 9. a through hole; 10. an outer wall surface; 11. working medium; 12. the vortex cooling gun.
Detailed Description
The technical solution of the present invention is further described in detail by the following embodiments.
As shown in fig. 1, fig. 2, fig. 3 and fig. 4, the phase-change heat storage composite superhard abrasive grinding wheel comprises a grinding wheel base body 1 and abrasive materials 2 arranged on the periphery of the grinding wheel base body, wherein an annular tube cavity 3 is arranged in a region close to the outer end of the grinding wheel base body 1, heat dissipation fins 4 are arranged in the annular tube cavity 3, the inner ends and two side ends of the heat dissipation fins 4 are in contact with the grinding wheel base body 1, the outer ends of the heat dissipation fins 4 extend towards the outer wall surface 10 of the annular tube cavity 3 but are not in contact with the outer wall surface, and the distance is 10mm-30mm.
The outer wall surface 10 of the annular tube cavity 3 is bonded with a layer of foam metal 5 through structural adhesive, the thickness of the foam metal 5 is 0.2mm-1.5mm, the aperture of the foam metal 5 is 20PPi-80PPi, the through hole rate of the foam metal 5 is higher than 95%, a working medium 11 is injected into the annular tube cavity 3, the boiling point of the working medium 11 is 10-50 ℃, and isopentane is adopted in the embodiment.
The main function of the foam metal 5 in this embodiment is only to improve the boiling efficiency of the working medium, and the advantage that the micro-pore structure of the foam metal is beneficial to bubble nucleation is utilized, so that the working medium and the wall surface of the tube cavity can enter a nucleate boiling state only by maintaining a small temperature difference, and the working medium is not used for heat storage or heat conduction, and in this embodiment, when the temperature of the working medium reaches 28 degrees, the working medium can enter the boiling state.
Radiating fin 4 includes annular main part 41 and circumference array at the outer round fin 42 of annular main part, radiating fin 4 structure as an organic whole, aluminum alloy, copper product or steel can be chooseed for use to the material, radiating fin 4 scribbles high heat conduction structural adhesive and realizes connecting through heating heat preservation solidification with the junction area of annular tube chamber 3.
The main functions of the radiating fins are four: the first is used as the cold end of the phase-change convection heat transfer of the working medium and is used for condensing the vaporized working medium; secondly, the heat storage and heat transfer element absorbs the heat transferred by the phase change working medium, gradually transfers the heat to the outside through the grinding wheel base body by connecting the heat storage and heat transfer element with the grinding wheel base body 1, and can temporarily store the heat by utilizing the characteristic of high heat capacity of the heat storage and heat transfer element when the temperature is not smoothly transferred; thirdly, the space in front of the radiating fins is used for providing space for phase change heat transfer, and meanwhile, the large surface area characteristic is adopted, so that the vaporized phase change working medium can be fully contacted with the radiating fins to realize rapid condensation, and meanwhile, the radiating fins are as close to the outer wall surface 10 as possible, so that the path of boiling heat transfer can be shortened; and fourthly, the thin-wall structure at the annular tube cavity of the grinding wheel is effectively supported through the radiating fins, so that structural strength is provided for the grinding wheel.
Specifically, one side wall of the annular tube cavity 3 is an annular end cover 6 assembled on a grinding wheel base body, a liquid injection hole 7 communicated with the annular tube cavity is formed in the grinding wheel base body 1, a sealing plug 8 used for plugging the liquid injection hole 7 is arranged in the grinding wheel base body 1, a through hole 9 is formed in the radiating fin 4 corresponding to the liquid injection hole 7, and the diameter of the through hole 9 is 2mm-3mm.
The working principle is as follows:
after the processing begins, the emery wheel rotates at a high speed, and a small amount of working medium that pours into this moment forms a thin layer liquid film at the excircle wall of annular tube chamber under the centrifugal force effect, and liquid film thickness is a little higher than about 2mm of foam metal's thickness, and the heat of grinding arc district gets into annular tube chamber 3 of emery wheel from the abrasive material layer simultaneously, and the excircle wall of annular tube chamber 3 can be regarded as the boiling heat transfer surface in the pond approximately.
Because the micro-pore structure of the foam metal is beneficial to the nucleation of bubbles, the working medium and the outer wall surface of the annular tube cavity can enter a nucleate boiling state only by maintaining a small temperature difference, and in the embodiment, the boiling temperature is about 28 degrees approximately.
As shown in fig. 4, the vaporized working medium rapidly moves toward the inner hole of the grinding wheel under the action of the driving force of the air pressure difference, because the outer ends of the heat dissipation fins are close to the foam metal, the vaporized working medium can rapidly contact with the heat dissipation fins, meanwhile, the vaporized working medium is rapidly and sufficiently condensed and dissipated by utilizing the large surface area of the heat dissipation fins, and the condensed working medium returns to the outer wall surface of the annular tube cavity again under the action of the centrifugal force to prepare for the next boiling heat transfer.
Meanwhile, the heat dissipation fins have large heat capacity and high heat conductivity, the heat dissipation fins further transfer absorbed heat to the grinding wheel matrix through two sides and the tail end, and finally the heat is led out through the heat convection of the grinding wheel matrix and the external environment, in practical application, as shown in fig. 5, eddy current cooling guns 12 are respectively installed on two sides of the annular tube cavity outside the grinding wheel and used for enhancing the heat convection; in addition, when the heat is not sufficiently conducted to the outside, the heat can be temporarily stored by utilizing the characteristic that the heat radiating fins have large heat capacity.
Through the process, the heat conduction efficiency and the heat capacity of the grinding wheel are improved, and the thermal property of the grinding wheel is finally improved.
The importance of the improvement of the heat conduction efficiency and the heat capacity property and the theoretical basis of the improvement are explained in a mode of mathematical demonstration.
When the grinding wheel is used for grinding, the grinding material layer on the outer circular surface can be regarded as an input end of heat, and the grinding arc area can be regarded as a heat source. By combining the structure of the phase-change heat storage composite grinding wheel, the total heat transfer coefficient of the grinding wheel can be approximately a heat transfer process from outside to inside of the cylinder wall of the composite structure under the condition of neglecting the thermal contact resistance between the grinding surface of the grinding wheel and the surface of a workpiece.
Therefore, if the lumen part of the grinding wheel is used as the main part for heat transfer, the whole heat transfer process mainly comprises two modes of heat transfer and phase change heat transfer, and the total heat transfer coefficient can be expressed as follows:
in the formula: λ S is the heat conductivity coefficient of the grinding wheel base material, h1 is the boiling heat exchange coefficient on the outer wall surface of the annular tube cavity, h0 is the condensation heat exchange coefficient of the vaporized working medium on the surface of the heat dissipation fin and the wall surface of the tube cavity, D is the diameter of the grinding wheel, D1 is the diameter of the outer circular surface of the tube cavity of the grinding wheel, S is the surface area of the heat dissipation fin, and R' is the thermal resistance of the phase change heat transfer space part in the tube cavity.
Compared with the traditional grinding wheel with a pure carbon steel base body, the heat transfer process is only heat conduction, and if the pipe cavity parts with the same size are compared, the heat transfer coefficient of the traditional grinding wheel can be expressed as follows:
in the formula: d2 is the diameter of the inner circular surface of the circular pipe cavity of the grinding wheel.
Assuming that the length (radial direction) of an annular tube cavity and the length (radial direction) of a radiating fin inside the composite grinding wheel are 35mm, and the wall thickness of the outer circular surface of the grinding wheel is 1.0mm, compared with a traditional single-layer superhard abrasive grinding wheel, the thermal resistance of the wall thickness heat transfer part of the outer circular surface of the grinding wheel in the formula (1) and the thermal resistance of the phase change heat transfer part inside the tube cavity are small values, so that the thermal resistance can be ignored. In addition, the surface area S of the radiating fin on the unit width is much larger than the surface area of the boiling heat exchange of the working medium, and the heat exchange coefficient h0 during the condensation of the vaporized working medium is slightly higher than the boiling heat exchange coefficient h1 due to the rough surface condition, so the heat resistance of the condensation heat dissipation in the tube cavity is small and can be ignored. In conclusion, under a certain grinding wheel structure, the total heat transfer coefficient of the phase change heat storage composite grinding wheel mainly depends on the boiling heat exchange coefficient h1 on the outer circle wall surface of the tube cavity. In practice, the heat conductivity coefficient of the composite grinding wheel can be improved by 2-3 times compared with that of a carbon steel grinding wheel with the same specification.
When the phase-change heat storage composite grinding wheel conducts heat of a grinding arc area, the grinding arc area and the grinding wheel form a heat transfer system. According to the heat transfer principle and the law of conservation of energy, after grinding heat enters the grinding wheel quickly, the grinding wheel needs to maintain the stability of a system of the grinding wheel through heat dissipation, and if the entering heat cannot be dissipated timely, the residual heat can only be stored in the grinding wheel, and meanwhile, the heat transfer system is heated continuously. At the moment, the heat capacity of the grinding wheel plays a key role in controlling the temperature rise rate of the heat transfer system. For the internal pipe cavity part of the grinding wheel heat transfer main body, the heat capacity is formed by combining various substances, including liquid working media, vapor working media and fin materials, and the equivalent heat capacity can be expressed as follows:
m 0 ＝ρ c V c +ρ l V l +ρ v V v (3)
in the formula: q is the heat accumulated in the pipe cavity of the grinding wheel, delta T is the temperature rise caused by each substance in the pipe cavity, m0 is the total mass of each substance in the pipe cavity, rhoc, rhol and rhov respectively correspond to the density of the radiating fin, the liquid working medium and the gas working medium, and Vc, vl and Vv respectively correspond to the volume of the radiating fin, the liquid working medium and the gas working medium.
Because the density of the gas working medium is small, the injection amount of the liquid working medium is also small, and the heat capacities of the two parts can be ignored. Therefore, the heat capacity inside the grinding wheel lumen depends mainly on the properties and quality of the heat-radiating fins. Because the radiating fins are contacted with the grinding wheel base body, and a heat transfer effect exists between the radiating fins and the grinding wheel base body, the grinding wheel base body actually participates in heat storage, and for the form of compounding the radiating fins and the steel base body, the heat capacity of the compound grinding wheel is close to that of the traditional pure carbon steel base body.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (9)
1. The utility model provides a compound superabrasive grinding wheel of phase transition heat-retaining which characterized in that: the grinding wheel comprises a grinding wheel base body and abrasive materials arranged on the periphery of the grinding wheel base body, an annular tube cavity is arranged in the area close to the outer end of the grinding wheel base body, heat dissipation fins are installed in the annular tube cavity, the inner ends and the two side ends of the heat dissipation fins are in contact with the grinding wheel base body, the outer ends of the heat dissipation fins extend to the outer wall surface of the annular tube cavity but are not in contact with the outer wall surface of the annular tube cavity, a layer of foam metal is arranged on the outer wall surface of the annular tube cavity, and working media are injected into the annular tube cavity.
2. The phase change heat storage composite superabrasive grinding wheel of claim 1, wherein: the distance between the outer ends of the radiating fins and the outer wall surface of the annular tube cavity is 10mm-30mm, and the thickness of the foam metal is 0.2mm-1.5mm.
3. The phase change heat storage composite superabrasive wheel of claim 1 or 2, wherein: the aperture of the foam metal is 20-80 PPi, and the through hole rate of the foam metal is higher than 95%.
4. The phase change heat storage composite superabrasive grinding wheel of claim 3, wherein: the boiling point of the phase change working medium is between 10 ℃ and 50 ℃.
5. Is characterized in that: the radiating fins comprise an annular main body and a circle of fins of which the circumference is arrayed outside the annular main body, and the radiating fins are of an integrated structure.
6. The phase change heat storage composite superabrasive wheel of claim 5, wherein: and the connection areas of the radiating fins and the two sides of the annular tube cavity are coated with high-heat-conductivity structural adhesive and are connected through heating, heat preservation and solidification.
7. The phase change heat storage composite superabrasive wheel of claim 1 or 2 or 4 or 6, wherein: one side wall of the annular tube cavity is an annular end cover assembled on the grinding wheel base body, a liquid injection hole communicated with the annular tube cavity is formed in the grinding wheel base body, a sealing plug used for plugging the liquid injection hole is arranged in the grinding wheel base body, a through hole is formed in the heat dissipation fin corresponding to the liquid injection hole, and the diameter of the through hole is 2mm-3mm.
8. The phase change heat storage composite superabrasive wheel of claim 3, wherein: the foam metal is bonded on the outer wall surface of the annular tube cavity through structural adhesive.
9. The phase change heat storage composite superabrasive wheel of claim 8, wherein: the outer wall surface of the annular tube cavity is a smooth wall surface or a special-shaped wall surface.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117134539A (en) * | 2023-09-11 | 2023-11-28 | 贝德凯利电气(苏州)有限公司 | Water-cooling heat dissipation structure of high-voltage direct-current fan |
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2022
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117134539A (en) * | 2023-09-11 | 2023-11-28 | 贝德凯利电气(苏州)有限公司 | Water-cooling heat dissipation structure of high-voltage direct-current fan |
| CN117134539B (en) * | 2023-09-11 | 2024-03-19 | 贝德凯利电气(苏州)有限公司 | Water-cooling heat dissipation structure of high-voltage direct-current fan |
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