Y-shaped flow channel for transformer radiator and corresponding radiator
By adopting a Y-shaped flow channel structure in the transformer heat sink and optimizing the flow channel design, the problem of uneven fluid flow caused by straight flow channels is solved, and a more efficient heat dissipation effect is achieved.
Patent Information
- Application Number
- CN202423173572.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-12-23
AI Technical Summary
The straight flow channels of existing transformer heat sinks result in uneven fluid flow and low heat dissipation efficiency, which cannot meet the heat dissipation requirements of high-capacity transformers.
The Y-shaped flow channel structure is adopted, which is formed by combining several sets of identical sub-unit flow channels. Each set includes straight flow channels and angled flow channels. The flow channel design is optimized to improve the convective heat transfer effect between the fluid and the inner wall.
With the heat sink area remaining constant, the Y-shaped flow channel significantly improves the heat dissipation effect, enhances the convective heat transfer performance between the fluid and the inner wall, and strengthens the heat dissipation efficiency.
Smart Images
Figure CN223566397U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of radiator flow channel structure, concretely to a Y type flow channel for transformer radiator, and the utility model also provides a radiator using the flow channel. BACKGROUND
[0002] To ensure the thermal life of the transformer, the temperature of the winding and the core cannot exceed the limit value specified in the standard. When the capacity of the transformer gradually increases, relying only on the heat dissipation of the transformer oil tank wall is not enough, and the heat dissipation surface of the transformer needs to be increased.
[0003] At present, the oil-immersed transformer using non-strong oil circulation cooling is a sheet type radiator, which is formed by pressing a thin steel plate into a grooved oil channel, and then two steel plates are butt welded into a sheet of cooling fin. The cooling fins are evenly arranged and welded at a certain interval to form a radiator.
[0004] The flow channel in the existing technology is linear due to the constraints of production cycle and processing cost. The biggest disadvantage of this structure is that the heat of the fluid flowing through the unit area of the cooling fin is less, and the heat dissipation efficiency of a single cooling fin is not high. The flow channel of the sheet type radiator is generally linear. Because the linear type is the simplest pattern in the production process of the flow channel, the production cycle of the radiator is relatively shortened. However, the linear flow channel has poor shunt performance, which leads to the fact that the transformer oil cannot maintain good flow uniformity, and there is still optimization space in the structure. INVENTION CONTENTS
[0005] In view of the above problems, the utility model provides a Y type flow channel for transformer radiator, which can make the transformer oil fully convect with the inner wall during the flow process, and improve the heat dissipation effect.
[0006] A Y type flow channel for transformer radiator, characterized in that: it is formed by a plurality of groups of same sub-unit flow channels, each group of sub-unit flow channels is a Y type flow channel, and each group of sub-unit flow channels comprises a straight flow channel and a pair of angle converging inclined flow channels;
[0007] The pair of angle converging inclined flow channels comprises a first inclined flow channel and a second inclined flow channel, the lengths of the first inclined flow channel and the second inclined flow channel are the same, the first inclined flow channel and the second inclined flow channel form a flow channel included angle α, and the first inclined flow channel and the second inclined flow channel form a converging point.
[0008] The length of the straight flow channel is L, one end of the length direction of the straight flow channel is the confluence point of the sub-unit flow channel, the other end of the length direction of the straight flow channel is the confluence point of the adjacent sub-unit flow channel in the length direction, the first inclined flow channel and the second inclined flow channel are symmetrically arranged relative to the extension line of the straight flow channel, the interval between the two end points of the first inclined flow channel and the second inclined flow channel is the horizontal width H of the entire sub-unit flow channel, the end point of the first inclined flow channel and the end point of the second inclined flow channel of the adjacent sub-unit flow channel on one side of the width direction confluence to form a confluence point, and the end point of the second inclined flow channel and the end point of the first inclined flow channel of the other sub-unit flow channel on the other side of the width direction confluence to form a confluence point.
[0009] It is further characterized in that:
[0010] The longitudinal section shape of the straight flow channel, the first inclined flow channel and the second inclined flow channel in each group of sub-unit flow channels is the same, so that the flow channel width D of the straight flow channel, the first inclined flow channel and the second inclined flow channel in each group of sub-unit flow channels is equal;
[0011] Preferably, the flow channel included angle α is 120°;
[0012] The length L of the straight flow channel is 17-47 mm;
[0013] The horizontal width H of the sub-unit flow channel is 30-40 mm;
[0014] The flow channel width D is 4-40 mm;
[0015] More preferably, the length L of the straight flow channel is greater than the horizontal width H of the sub-unit flow channel;
[0016] When the flow channel included angle α is 120°, the length L of the straight flow channel is 17-47 mm, the horizontal width H of the sub-unit flow channel is 30-40 mm, and the flow channel width D is 4-40 mm, the thermal efficiency of the sub-unit flow channel corresponding to the Y-type flow channel is 0.782.
[0017] A transformer radiator characterized in that: the inside adopts the Y-type flow channel for the transformer radiator, and the sub-unit flow channels are arranged in the heat dissipation surface area of the radiator.
[0018] After the structure of the utility model is adopted, under the conditions that the radiator area is equal, the transformer operating state is unchanged, and the outdoor environment working condition is the same, compared with the sheet type radiator with straight flow channels, the Y-type flow channel can make the transformer oil fully convect and exchange heat with the inner wall in the flowing process, and improve the heat dissipation effect. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1A subunit flow channel combination structure diagram of the Y-shaped flow channel of the utility model is shown in the figure.
[0020] Figure 2 A three-dimensional simulation diagram of the subunit flow channel of the Y-shaped flow channel is shown in the figure.
[0021] Figure 3 A trend diagram of the thermal efficiency and the pressure drop coefficient obtained by simulation with L is shown in the figure.
[0022] Figure 4 A trend diagram of the thermal efficiency and the pressure drop coefficient obtained by simulation with the flow channel width D is shown in the figure.
[0023] Figure 5 A double-target optimization response cloud map is shown in the figure.
[0024] The names corresponding to the serial numbers in the figure are as follows:
[0025] Unit flow channel 10, straight flow channel 1, first inclined flow channel 2, second inclined flow channel 3, and flow convergence point 4. DETAILED DESCRIPTION
[0026] A Y-shaped flow channel for a transformer radiator is shown in the figure. Figure 1 : It is formed by combining several groups of the same subunit flow channel 10, each group of the subunit flow channel 10 is a Y-shaped flow channel, and each group of the subunit flow channel 10 includes a straight flow channel 1 and a pair of angle converging inclined flow channels.
[0027] The pair of angle converging inclined flow channels includes a first inclined flow channel 2 and a second inclined flow channel 3, the lengths of the first inclined flow channel 2 and the second inclined flow channel 3 are the same, the first inclined flow channel 2 and the second inclined flow channel 3 form a flow channel included angle α, and the first inclined flow channel 2 and the second inclined flow channel 3 form a flow convergence point 4.
[0028] The length of the straight flow channel 1 is L, one end of the length direction of the straight flow channel 1 is the flow convergence point 4 of the subunit flow channel 10, the other end of the length direction of the straight flow channel 1 is the flow convergence point 4 of the adjacent subunit flow channel 10 in the length direction, the first inclined flow channel 2 and the second inclined flow channel 3 are symmetrically arranged relative to the extension line of the straight flow channel 1, the distance between the two end points of the first inclined flow channel 2 and the second inclined flow channel 3 is the horizontal width H of the entire subunit flow channel 10, the end point of the first inclined flow channel 2 and the end point of the second inclined flow channel 3 of the adjacent subunit flow channel 10 on one side of the width direction converge to form the flow convergence point 4, and the end point of the second inclined flow channel 3 and the end point of the first inclined flow channel 2 of the other subunit flow channel 10 on the other side of the width direction converge to form the flow convergence point 4.
[0029] In the embodiment, the longitudinal section shape of the straight flow channel 1, the first inclined flow channel 2 and the second inclined flow channel 3 in each group of sub-unit flow channels is the same, so that the flow channel width D of the straight flow channel 1, the first inclined flow channel 2 and the second inclined flow channel 3 in each group of sub-unit flow channels is equal.
[0030] The heat dissipation effect of the Y-shaped flow channel with different parameters is evaluated by the heat efficiency and pressure drop coefficient of the heat sink, which is carried out by three-dimensional simulation as shown in Figure 2 Under the steady state condition, the useful energy gain of the heat sink is:
[0031] Q=A·F·[U L (T p -T a )]
[0032] In the formula, Q is the temperature variable of the transformer oil, W; A is the area of the heat sink structure unit, m 2 ; F is the efficiency factor; U L is the heat loss coefficient; T p is the average temperature of the heat sink, K; T a is the temperature of the transformer oil in the flow channel, K. The efficiency factor can be expressed as:
[0033]
[0034] In the formula, h i is the convective heat transfer coefficient in the flow channel, and the heat efficiency η representing the heat dissipation performance of the heat sink is:
[0035]
[0036] The pressure loss coefficient P' can be expressed as:
[0037]
[0038] In the formula, P loss and P' are the pressure loss and pressure equalization of the heat collector, respectively, and P in and P out are the inlet pressure and outlet pressure of the heat collector, respectively.
[0039] Under the condition that other conditions remain unchanged, Figure 3 the change trend of the heat efficiency and the pressure drop coefficient with the length of the heat transfer unit is shown. It can be seen that the pressure drop coefficient is negatively correlated with the length L of the straight flow channel, and the heat efficiency increases first and then decreases. The value of L needs to have a certain range, and cannot be too large or too small, otherwise the significance of the next bifurcation of the flow channel will be lost. Within the set range of L value, the fluid must ensure a certain speed to carry out the next flow distribution (not to lose too much pressure), so L must have an optimal value to make the heat transfer efficiency highest, in other words, the heat efficiency increases first and then decreases with L. Figure 3(a) and (b) show that when L is 47mm, the thermal efficiency reaches the peak value of 0.741 and 0.774, and then starts to decrease with a faster trend, while Figure 3 (c) shows that the maximum value of thermal efficiency 0.742 appears when L is 37mm.
[0040] As shown in Figure 4 the influence of the change of the flow channel width on the thermal efficiency and the pressure drop coefficient.
[0041] Figure 4 (a) shows that the thermal efficiency is generally positively correlated with the flow channel width, but when the linear flow channel length L is too small, the flow channel is too wide, which reduces the thermal efficiency, for example, when L is 17mm and 27mm, with the increase of the flow channel width, the thermal efficiency first increases and then decreases, which is because the too small L value leads to the reduction of the heat transfer area; Figure 4 (b) shows that the pressure drop coefficient is negatively correlated with the flow channel width, the wider the flow channel, the smaller the velocity attenuation of the fluid. Therefore, the optimal values of the thermal efficiency and the pressure drop coefficient appear in the wider flow channel.
[0042] Using response surface analysis to analyze various results, it is obtained that when the flow channel angle a is 120°, the flow channel width D is 11mm, the linear flow channel length L is 40mm, and the width H is 35mm, the thermal efficiency of the Y-type flow channel unit is 0.782, and the pressure drop coefficient is 0.121, so the unit structure is the best regulation and control scheme simulated, and the response surface cloud chart of the thermal efficiency and the pressure drop coefficient after optimization is shown in Figure 5 .
[0043] A transformer radiator: the inside adopts the Y-type flow channel for the transformer radiator, and the sub-unit flow channels are arranged on the heat dissipation surface of the radiator.
[0044] Under the conditions that the radiator area is equal, the transformer operating state is unchanged, and the outdoor environmental conditions are the same, compared with the sheet type radiator with the linear flow channel, the Y-type flow channel can make the transformer oil fully convect with the inner wall in the flowing process, and improve the heat dissipation effect.
[0045] It is obvious for those skilled in the art that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims instead of the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any figure reference in the claims should not be regarded as limiting the involved claims.
[0046] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature described. The specification can include implicit combinations of explicitly mentioned features and / or explicit combinations of implicitely mentioned features. Each embodiment depends on the explicit combinations of features and / or the implicit combinations of features made specifically within that embodiment, and each such embodiment can be combined with every other such embodiment to create further embodiments.
Claims
1. A Y-shaped flow channel for a transformer radiator, characterized by: It is combined by several groups of same sub-unit flow channels, each group of sub-unit flow channels is Y-shaped flow channel, and each group of sub-unit flow channels comprises a straight flow channel and a pair of angle converging oblique flow channels; The pair of angle converging oblique flow channels comprises a first oblique flow channel and a second oblique flow channel, the first oblique flow channel and the second oblique flow channel have the same length, the first oblique flow channel and the second oblique flow channel form a flow channel included angle α, and the first oblique flow channel and the second oblique flow channel form a converging point; The length of the straight flow channel is L, one end of the length direction of the straight flow channel is the converging point of the sub-unit flow channel, the other end of the length direction of the straight flow channel is the converging point of the adjacent sub-unit flow channel in the length direction, the first oblique flow channel and the second oblique flow channel are symmetrically arranged relative to the extension line of the straight flow channel, the distance between the two end points of the first oblique flow channel and the second oblique flow channel is the horizontal width H of the whole sub-unit flow channel, the end point of the first oblique flow channel and the end point of the second oblique flow channel of the adjacent sub-unit flow channel on one side in the width direction converge to form a converging point, and the end point of the second oblique flow channel and the end point of the first oblique flow channel of the other sub-unit flow channel on the other side in the width direction converge to form a converging point.
2. A Y-shaped flow channel for a transformer radiator according to claim 1, characterized in that: The longitudinal section shapes of the straight flow channel, the first oblique flow channel and the second oblique flow channel in each group of sub-unit flow channels are the same, so that the flow channel widths D of the straight flow channel, the first oblique flow channel and the second oblique flow channel in each group of sub-unit flow channels are equal.
3. A Y-shaped flow channel for a transformer radiator according to claim 2, characterized in that: The flow channel included angle α is 120°.
4. A Y-shaped flow channel for a transformer radiator according to claim 2, characterized in that: The length L of the straight flow channel is 17mm-47mm.
5. A Y-shaped flow channel for a transformer radiator according to claim 2, characterized in that: The horizontal width H of the sub-unit flow channel is 30-40mm.
6. A Y-shaped flow channel for a transformer radiator according to claim 2, characterized in that: The flow channel width D is 4-40mm.
7. A Y-shaped flow channel for a transformer radiator according to claim 2, characterized in that: The length L of the straight flow channel is greater than the horizontal width H of the sub-unit flow channel.
8. A Y-shaped flow channel for a transformer radiator according to claim 2, characterized in that: When the flow channel included angle α is 120°, the length L of the straight flow channel is 17mm-47mm, the horizontal width H of the sub-unit flow channel is 30-40mm, and the flow channel width D is 4-40mm, the thermal efficiency of the sub-unit flow channel corresponding to the Y-shaped flow channel is 0.
782.
9. A transformer radiator, characterized by: The inside of the transformer radiator adopts the Y-shaped flow channel of any one of claims 1-8, and the sub-unit flow channels are arranged in the heat dissipation surface area of the radiator.