Low-boiling point radiator

Abstract

A low-boiling point radiator having an evaporator, a condensing fin group, and a heat pipe is provided. The evaporator defines a cavity. The condensing fin group is opposite to the evaporator and defines a convergence chamber and a shunt chamber. The heat pipe is connected between the evaporator and the condensing fin group along a longitudinal direction and defines an evaporation channel and a suction channel not communicated to the evaporation channel. A cross-section of the evaporation channel and a cross-section of the suction channel are both non-circle. The evaporation channel is communicated to the cavity and the shunt chamber along the longitudinal direction. The suction channel is communicated to the convergence chamber and the cavity along the longitudinal direction. A working fluid may generate a circulation loop without interfering with each other during evaporation and condensation and increase a flow and a flow rate through the heat pipe.

Description

BACKGROUNDTechnical Field

[0001] The present disclosure relates to the field of heat dissipation, particularly to a low-boiling point radiator.Description Of Related Art

[0002] With the vigorous development of electronic technology, various electronic devices have gradually developed towards high performance, thinner, and lighter to meet the diverse needs of users. However, while various electronic components are improving performance and becoming thinner, electronic components will also significantly increase the heat generated during operation. Therefore, electronic devices need to greatly improve the heat dissipation performance within a limited space to ensure stability and service life during use. The common method is to dissipate heat from a heat source of electronic components through a vapor chamber, a heat sink, a heat pipe, or a combination thereof.

[0003] However, the heat dissipation performance of the vapor chamber and the heat sink is mainly limited by their area and volume such that the heat dissipation performance that may be improved is limited. Besides, the heat pipe is generally a circular tube such that the diameter of the circular tube also has a certain upper limit and this restricts the improvement of the heat dissipation performance. On the other hand, the vapor chamber and the heat pipe achieve the cooling effect by the two-phase change of a working fluid hermetically filled therein when it is heated and cooled. However, since the gas and liquid of the working fluid are in the same chamber or space inside the vapor chamber or the heat pipe, the working fluid may interfere with each other during evaporation and condensation to affect the heat dissipation performance.

[0004] In view of the above, the inventor seeks to overcome the aforementioned drawbacks associated with the current technology and aims to provide an effective solution through extensive researches along with utilization of academic principles and knowledge.SUMMARY

[0005] The primary objective of the present disclosure is to make a working fluid generate a circulation loop without interfering with each other during evaporation and condensation and effectively increase a flow and a flow rate thereof through the heat pipe, so as to enhance a heat dissipation efficiency of the low-boiling point radiator.

[0006] To accomplish the aforementioned objective, the present disclosure provides a low-boiling point radiator having an evaporator, a condensing fin group, and a heat pipe. The evaporator defines a cavity. The condensing fin group is opposite to the evaporator and defines a convergence chamber and a shunt chamber. The heat pipe is connected between the evaporator and the condensing fin group along a longitudinal direction, the heat pipe defines an evaporation channel and a suction channel not communicated to the evaporation channel, the evaporation channel communicated to the cavity and the shunt chamber along the longitudinal direction, the suction channel communicated to the convergence chamber and the cavity along the longitudinal direction, wherein a cross-section of the evaporation channel and a cross-section of the suction channel are both non-circle.

[0007] Another aspect of the present disclosure provides that the heat pipe is connected at a center of the condensing fin group or near the center of the condensing fin group.

[0008] Another aspect of the present disclosure provides that a plurality of ribs is arranged in the evaporation channel and extended along the longitudinal direction.

[0009] Another aspect of the present disclosure provides that each of the ribs is arranged on an inner wall of the evaporation channel away from the suction channel.

[0010] Another aspect of the present disclosure provides that a plurality of capillary structures is arranged on at least one inner wall of the suction channel and extended along the longitudinal direction.

[0011] Another aspect of the present disclosure provides that the evaporator includes a bottom plate, a shell, and a plurality of dissipation baffles, the shell is arranged on the bottom plate to form the cavity between the bottom plate and the shell, the dissipation baffles are parallel to each other and arranged in the cavity perpendicularly to the longitudinal direction, each of the dissipation baffles defines an evaporation notch and a suction notch, each of the evaporation notches is arranged along the longitudinal direction and communicated to the evaporation channel, each of the suction notches is arranged along the longitudinal direction and communicated to the suction channel.

[0012] Another aspect of the present disclosure provides that the shell defines a transitional chamber, an installation opening, a convergence opening, and a shunt opening, an end of the heat pipe connected to the evaporator is arranged in the transitional chamber through the installation opening, the evaporation channel is communicated to each of the evaporation notches through the convergence opening, the suction channel is communicated to each of the suction notches through the shunt opening.

[0013] Another aspect of the present disclosure provides that the condensing fin group includes a main body, a plurality of first baffles, and a plurality of second baffles, the first baffles are parallel to each other and arranged on a side of the main body perpendicularly to the longitudinal direction, the second baffles are parallel to each other and arranged on another side of the main body perpendicularly to the longitudinal direction, each of the first baffles defines a first notch, each of the first notches is arranged in the shunt chamber along the longitudinal direction to be communicated to the evaporation channel, each of the second baffles defines a second notch, each of the second notches is arranged in the convergence chamber along the longitudinal direction to be communicated to the suction channel.

[0014] Another aspect of the present disclosure provides that the main body defines a pair of connecting chambers, each of the connecting chambers is respectively located on two sides of each of the first baffles and each of the second baffles, each of the first baffles forms a plurality of first dissipation channels with the main body, each of the first notches is communicated to each of the connecting chambers through each of the first dissipation channels, each of the second baffles forms a plurality of second dissipation channels with the main body, each of the connecting chambers is communicated to each of the second notches through each of the second dissipation channels.

[0015] Another aspect of the present disclosure provides that the condensing fin group further includes a plurality of first dissipation fins and a plurality of second dissipation fins, each of the first dissipation fins is arranged in the main body and located between each of the first baffles and each of the second baffles, each of the second dissipation fins is arranged on a side of each of the second baffles away from each of the first baffles.

[0016] In the low-boiling point radiator of the present disclosure, the heat pipe is connected between the evaporator and the condensing fin group along the longitudinal direction, the evaporation channel and the suction channel of the heat pipe are not communicated, and the cross-section of the evaporation channel and the cross-section of the suction channel are both non-circles. Therefore, the working fluid may generate the circulation loop without interfering with each other during evaporation and condensation and effectively increase the flow and the flow rate thereof through the heat pipe, so as to enhance the heat dissipation efficiency of the low-boiling point radiator.BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG. 1 is a perspective appearance view of the present disclosure;

[0018] FIG. 2 is an exploded view of the present disclosure;

[0019] FIG. 3 is an exploded view of the evaporator of the present disclosure;

[0020] FIG. 4 is another exploded view of the evaporator of the present disclosure;

[0021] FIG. 5 is a partial exploded view of the condensing fin group of the present disclosure;

[0022] FIG. 6 is another partial exploded view of the condensing fin group of the present disclosure;

[0023] FIG. 7 is a cross-sectional side view of the present disclosure;

[0024] FIG. 8 is a cross-sectional view of the heat pipe facing to the evaporator of the present disclosure;

[0025] FIG. 9 is a cross-sectional view of the heat pipe facing to the condensing fin group of the present disclosure;

[0026] FIG. 10 is a cross-sectional top view of the present disclosure in using status; and

[0027] FIG. 11 is another cross-sectional top view of the present disclosure in using status.DETAILED DESCRIPTION

[0028] It is to be understood that the terms for indicating positions and the location relation, for example “front”, “rear”, “left”, “right”, “front end”, “rear end”, “distal end”, “longitudinal direction”, “lateral direction”, “vertical direction”, “top” and “bottom”, are based on the positions and the location relation disclosed in the drawings, and only used for disclosing the present disclosure and not used for indicating or implying the specified location of the device or the components or the specified structure and operation in certain location, thus the present disclosure is not intended to be limiting.

[0029] For example, the terms of “first”, “second”, “third”, “forth” and “fifth” are used for illustrating each unit, component, area, layer and / or part. The component, the unit, the area, the layer and / or the part are not limited by the terms. These terms are only used for separating the element, the assembly, the area, the layer, or the part. Unless being clearly indicated according to the whole specification, the terms for example “the first”, “the second”, “the third”, “the fourth” and “the fifth” are not used for implying the order or sequence.

[0030] As used herein and not otherwise defined, the terms "substantially" and "approximately" are used to describe and describe small changes. When used in connection with an event or situation, the terms may include the precise moment at which the event or situation occurs, as well as the event or situation occurring to a close approximation. For example, when combined with a numerical value, the terms may include a range of variation equal to or less than ±5% of the numerical value, such as equal to or less than ±4%, equal to or less than ±3%, equal to or less than ±2%, equal to or less than ±1%, equal to or less than ±0.5%, equal to or less than ±0.1%, or equal to or less than ±0.05%.

[0031] The technical contents of the present disclosure will become apparent with the detailed description of embodiments and the accompanied drawings as follows. However, it shall be noted that the accompanied drawings are for illustrative purposes only such that they shall not be used to restrict the scope of the present disclosure.

[0032] The present disclosure provides a low-boiling point radiator, an interior of which is hermetically filled with a working fluid with low-boiling point (such as water, methanol, ethanol or acetone). The low-boiling point radiator is used to be attached on a heat source H and may form a circulating flow through the working fluid filled therein to dissipate heat from the heat source H, as shown in FIGS. 7, 10, and 11. Please refer to FIGS. 1, and 2 first, the low-boiling point radiator of the present disclosure includes an evaporator 10, a condensing fin group 20, and a heat pipe 30.

[0033] The evaporator 10 defines a cavity 101. The condensing fin group 20 is configured to be opposite to the evaporator 10. The condensing fin group 20 defines a convergence chamber 201 and a shunt chamber 202. In the embodiment, the shunt chamber 202 is located on the convergence chamber 201, but the present disclosure is not limited to this embodiment. For example, the shunt chamber 202 may also be located at left side of right side of the convergence chamber 201. The heat pipe 30 is connected between the evaporator 10 and the condensing fin group 20 along a longitudinal direction D. In detail, the heat pipe 30 is fixed between the evaporator 10 and the condensing fin group 20 by welding and forms a seal, but the present disclosure is not limited to this embodiment. The heat pipe 30 defines an evaporation channel 31 and a suction channel 32 not communicated to the evaporation channel 31. A cross-section of the evaporation channel 31 and a cross-section of the suction channel 32 are both non-circle. In the embodiment, the cross-section of the evaporation channel 31 and the cross-section of the suction channel 32 both are rectangle, but the present disclosure is not limited to this embodiment. For example, the cross-section of the evaporation channel 31 or the cross-section of the suction channel 32 may also be triangle, rhombus, parallelogram, ellipse, semicircle, pentagon, polygon or irregular shape...etc. The evaporation channel 31 is communicated to the cavity 101 and the shunt chamber 202 along the longitudinal direction D. The suction channel 32 is communicated to the convergence chamber 201 and the cavity 101 along the longitudinal direction D. In other words, the evaporation channel 31 in the embodiment is located on the suction channel 32, but the present disclosure is not limited to this embodiment.

[0034] Therefore, the evaporator 10, the condensing fin group 20, and the heat pipe 30 form a closed inner-circulation loop through the cavity 101, the evaporation channel 31, the shunt chamber 202, the convergence chamber 201, and the suction channel 32. The working fluid in the cavity 101 of the evaporator 10 may evaporate into a gaseous state when heated, then the gaseous working fluid may pass the evaporation channel 31 to enter the condensing fin group 20 from the shunt chamber 202 to cool and condense into a liquid state, and the liquid working fluid may enter the suction channel 32 from the convergence chamber 201 to return to the cavity 101 of the evaporator 10 to form the circulation loop. In addition, since the heat pipe 30 is connected between the evaporator 10 and the condensing fin group 20 along the longitudinal direction D, and the evaporation channel 31 and the suction channel 32 of the heat pipe 30 are not communicated and the cross-sections thereof are both non-circle, the working fluid in gaseous state and liquid state may not interfere with each other during evaporation and condensation, and this effectively increases a flow and a flow rate of the working fluid through the heat pipe 30, so as to enhance the heat dissipation efficiency of the low-boiling point radiator of the present disclosure.

[0035] Details are provided as follows. Please refer to FIGS. 3, 4, 7, and 8, the evaporator 10 mainly includes a bottom plate 11, a shell 12, and a plurality of dissipation baffles 13. The shell 12 is arranged on the bottom plate 11 to form the cavity 101 between the bottom plate 11 and the shell 12. The shell 12 has an infusion tube (not labelled in figures) to inject the working fluid into the cavity 101 and then cut off to seal. In the embodiment, the shell 12 is fixed to the bottom plate 11 by welding, but the present disclosure is not limited to this embodiment. The dissipation baffles 13 are parallel to each other, and each of the dissipation baffles 13 is arranged in the cavity 101 perpendicularly to the longitudinal direction D. Each of the dissipation baffles 13 defines at least one evaporation notch 131 and at least one suction notch 132. In detail, each of the evaporation notches 131 is correspondingly located on each of the suction notches 132. In the embodiment, a number of the evaporation notches 131 and a number of the suction notches 132 in each of the dissipation baffles 13 both are four, and each of the suction notches 132 is arranged in a straight line and correspondingly located under each of the evaporation notches 131. Therefore, the structural strength of each of the dissipation baffles 13 may be strengthened to reduce the size of each of the suction notches 132, so as to prevent each of the dissipation baffles 13 from deforming at each of the suction notches 132 due to thermal expansion. However, the number of the evaporation notches 131 and the number of the suction notches 132 in each of the dissipation baffles 13 may be modified according to different needs. For the convenience of description, only one evaporation notch 131 and one suction notch 132 in each of the dissipation baffles 13 are used in the following description.

[0036] Each of the evaporation notches 131 of each of the dissipation baffles 13 is arranged along the longitudinal direction D and communicated to the evaporation channel 31. Each of the suction notches 132 of each of the dissipation baffles 13 is arranged along the longitudinal direction D and communicated to the suction channel 32. The shell 12 defines a transitional chamber 121, an installation opening 122, a convergence opening 123, and a shunt opening 124. The installation opening 122, the convergence opening 123, and the shunt opening 124 are respectively located on different sides of the transitional chamber 121. In detail, the transitional chamber 121 is located on a front side of the shell 12 and is concaved toward an interior of the shell 12. The installation opening 122 is located at an outer side of the transitional chamber 121, and the convergence opening 123 and the shunt opening 124 are located at an inner side of the transitional chamber 121 and respectively communicated to the cavity 101. An end of the heat pipe 30 connected to the evaporator 10 is arranged in the transitional chamber 121 through the installation opening 122. Therefore, the evaporation channel 31 is communicated to each of the evaporation notches 131 through the convergence opening 123, and the suction channel 32 is communicated to each of the suction notches 132 through the shunt opening 124. In the embodiment, the evaporator 10 further includes a separation baffle 14. The separation baffle 14 is arranged in the cavity 101 and abuts against between the transitional chamber 121 and each of the dissipation baffles 13, so as to separate the flow path in the cavity 101. This may effectively ensure that the working fluid will not be mixed into the suction channel 32, the shunt opening 124, and each of the suction notches 132 when passing from each of the evaporation notches 131 through the convergence opening 123 to the evaporation channel 31, and at the same time effectively ensure that the working fluid will not be mixed into the evaporation channel 31, the convergence opening 123, and each of the evaporation notches 131 when passing from the suction channel 32 through the shunt opening 124 to each of the suction notches 132.

[0037] Please refer to FIGS. 5, 6,7, and 9, the condensing fin group 20 includes a main body 21, a plurality of first baffles 22, and a plurality of second baffles 23. The first baffles 22 are parallel to each other, and each of the first baffles 22 is arranged on a side of the main body 21 perpendicularly to the longitudinal direction D. The second baffles 23 are parallel to each other, and each of the second baffles 23 is arranged on another side of the main body 21 perpendicularly to the longitudinal direction D. Each of the first baffles 22 defines at least one first notch 221. Each of the first notches 221 of each of the first baffles 22 is arranged in the shunt chamber 202 along the longitudinal direction D to be communicated to the evaporation channel 31. Each of the second baffles 23 defines at least one second notch 231. Each of the second notches 231 of each of the second baffles 23 is arranged in the convergence chamber 201 along the longitudinal direction D to be communicated to the suction channel 32.

[0038] In the embodiment, the main body 21 is a rectangle block, but the present disclosure is not limited to this embodiment. Two opposite sides (up side and bottom side) of the main body 21 respectively form an accommodating groove (not labelled in figures) for arranging each of the first baffles 22 and each of the second baffles 23. The main body 21 defines a pair of connecting chambers 203. In detail, each of the connecting chambers 203 is respectively located on two sides (left side and right side) of each of the first baffles 22 and each of the second baffles 23. The condensing fin group 20 further includes an upper cover 24 and a case 25. The upper cover 24 and the case 25 are respectively arranged on two opposite sides (up side and bottom side) of the main body 21 to cover each of the first baffles 22 and each of the second baffles 23. Each of the first baffles 22 forms a plurality of first dissipation channels 222 with the main body 21 and the upper cover 24. Each of the first notches 221 is communicated to each of the connecting chambers 203 respectively located on left side and right side thereof through each of the first dissipation channels 222. Each of the second baffles 23 forms a plurality of second dissipation channels 232 with the main body 21 and the case 25. Each of the connecting chambers 203 is communicated to each of the second notches 231 located in the middle through each of the second dissipation channels 232.

[0039] The condensing fin group 20 further includes a plurality of first dissipation fins 26 and a plurality of second dissipation fins 27. Each of the first dissipation fins 26 is arranged in the main body 21 and located between each of the first baffles 22 and each of the second baffles 23, such that each of the first dissipation fins 26 is used to preliminary dissipate heat to the gaseous working fluid flowing through each of the first dissipation channels 222. Each of the second dissipation fins 27 is arranged on a side of each of the second baffles 23 away from each of the first baffles 22. In detail, each of the second dissipation fins 27 is arranged in the case 25, and each of the second dissipation fins 27 is used to secondary dissipate heat to the gaseous working fluid flowing through each of the second dissipation channels 232. Therefore, the gaseous working fluid that enters the shunt chamber 202 from the evaporation channel 31 may be preliminary dissipated heat by each of the first dissipation channels 222 and then enter each of the connecting chambers 203 on both sides. In addition, the gaseous working fluid may be secondary dissipated heat by each of the second dissipation channels 232 and then enter the convergence chamber 201 to cool and condense to liquid state, and then the liquid working fluid may leave the condensing fin group 20 from the suction channel 32.

[0040] Please refer to FIGS. 1, 2, 10, and 11. In the embodiment, the heat pipe 30 is substantially connected at a center of the condensing fin group 20 or near the center of the condensing fin group 20 such that the heat pipe 30 and the condensing fin group 20 may be T-shaped structure. Therefore, when the working fluid enters the shunt chamber 202 of the condensing fin group 20 from the evaporation channel 31, the working fluid may shunt and spread to both sides through each of the first dissipation channels 222 from the center or near the center of the condensing fin group 20, so as to achieve good effects of uniform flow and heat dissipation. However, the present disclosure is not limited to this arrangement.

[0041] In the embodiment, the heat pipe 30 is a hollow column in one-piece form, the evaporation channel 31 and the suction channel 32 are therefore parallel up and down and in one-piece form, but the heat pipe 30 may also be two-part form and the evaporation channel 31 and the suction channel 32 are integrally formed by assembling in another embodiment. In addition, a plurality of ribs 33 is arranged in the evaporation channel 31 of the heat pipe 30. Each of the ribs 33 is extended along the longitudinal direction D. In the embodiment, each of the ribs 33 is arranged on an inner wall of the evaporation channel 31 away from the suction channel 32 (that is a top of the evaporation channel 31) to strengthen a structural strength of the top of the evaporation channel 31 of the heat pipe 30, so as to prevent the heat pipe 30 from deforming due to thermal expansion. In addition, a plurality of capillary structures 34 is arranged in the suction channel32 of the heat pipe 30. In the embodiment, a formation of each of the capillary structures 34 may be groove type, woven mesh type, fiber type, or sintered metal powder type, the present disclosure is not limited to specific form. Each of the capillary structures 34 is arranged along the longitudinal direction D, and each of the capillary structures 34 is arranged on at least one inner wall of the suction channel 32 to enhance a suction force of the working fluid, so as to ensure that the working fluid may flow back to the evaporator 10 from the condensing fin group 20. In the embodiment, each of the capillary structures 34 is arranged on all of the inner walls (four inner walls) of the suction channel 32 to achieve the best suction effect, but the present disclosure is not limited to this embodiment. The location and number of each of the capillary structures 34 may be modified according to different needs and the cross-sectional shape of the suction channel 32.

[0042] In the low-boiling point radiator of the present disclosure, the heat pipe 30 is connected between the evaporator 10 and the condensing fin group 20 along the longitudinal direction D, the evaporation channel 31 and the suction channel 32 of the heat pipe 30 are not communicated, and the cross-section of the evaporation channel 31 and the cross-section of the suction channel 32 are both non-circle. Therefore, the working fluid may generate the circulation loop without interfering with each other during evaporation and condensation and effectively increase the flow and the flow rate thereof through the heat pipe 30, so as to enhance the heat dissipation efficiency of the low-boiling point radiator.

[0043] It shall be understood that the present disclosure may have other types of embodiments, and a person with ordinary skills in the art of the technical field of the present disclosure may make various changes and modifications corresponding to the present disclosure without deviating the principle and substance of the present disclosure; however, such corresponding changes and modification shall be considered to be within the claimed scope of the present disclosure.

Claims

1. A low-boiling point radiator, comprising:an evaporator, comprising a cavity;a condensing fin group, opposite to the evaporator and comprising a convergence chamber and a shunt chamber; anda heat pipe, connected between the evaporator and the condensing fin group along a longitudinal direction, the heat pipe comprising an evaporation channel and a suction channel not communicated to the evaporation channel, the evaporation channel communicated to the cavity and the shunt chamber along the longitudinal direction, the suction channel communicated to the convergence chamber and the cavity along the longitudinal direction, wherein a cross-section of the evaporation channel and a cross-section of the suction channel are both non-circle.

2. The low-boiling point radiator according to claim 1, wherein the heat pipe is connected at a center of the condensing fin group or near the center of the condensing fin group.

3. The low-boiling point radiator according to claim 1, wherein a plurality of ribs is arranged in the evaporation channel and extended along the longitudinal direction.

4. The low-boiling point radiator according to claim 3, wherein each of the ribs is arranged on an inner wall of the evaporation channel away from the suction channel.

5. The low-boiling point radiator according to claim 1, wherein a plurality of capillary structures is arranged on at least one inner wall of the suction channel and extended along the longitudinal direction.

6. The low-boiling point radiator according to claim 1, wherein the evaporator comprises a bottom plate, a shell, and a plurality of dissipation baffles, the shell is arranged on the bottom plate to form the cavity between the bottom plate and the shell, the dissipation baffles are parallel to each other and arranged in the cavity perpendicularly to the longitudinal direction, each of the dissipation baffles comprises an evaporation notch and a suction notch, each of the evaporation notches is arranged along the longitudinal direction and communicated to the evaporation channel, each of the suction notches is arranged along the longitudinal direction and communicated to the suction channel.

7. The low-boiling point radiator according to claim 6, wherein the shell comprises a transitional chamber, an installation opening, a convergence opening, and a shunt opening, an end of the heat pipe connected to the evaporator is arranged in the transitional chamber through the installation opening, the evaporation channel is communicated to each of the evaporation notches through the convergence opening, the suction channel is communicated to each of the suction notches through the shunt opening.

8. The low-boiling point radiator according to claim 1, wherein the condensing fin group comprises a main body, a plurality of first baffles, and a plurality of second baffles, the first baffles are parallel to each other and arranged on a side of the main body perpendicularly to the longitudinal direction, the second baffles are parallel to each other and arranged on another side of the main body perpendicularly to the longitudinal direction, each of the first baffles comprises a first notch, each of the first notches is arranged in the shunt chamber along the longitudinal direction to be communicated to the evaporation channel, each of the second baffles comprises a second notch, each of the second notches is arranged in the convergence chamber along the longitudinal direction to be communicated to the suction channel.

9. The low-boiling point radiator according to claim 8, wherein the main body comprises a pair of connecting chambers, each of the connecting chambers is respectively located on two sides of each of the first baffles and each of the second baffles, each of the first baffles forms a plurality of first dissipation channels with the main body, each of the first notches is communicated to each of the connecting chambers through each of the first dissipation channels, each of the second baffles forms a plurality of second dissipation channels with the main body, each of the connecting chambers is communicated to each of the second notches through each of the second dissipation channels.

10. The low-boiling point radiator according to claim 8, wherein the condensing fin group further comprises a plurality of first dissipation fins and a plurality of second dissipation fins, each of the first dissipation fins is arranged in the main body and located between each of the first baffles and each of the second baffles, each of the second dissipation fins is arranged on a side of each of the second baffles away from each of the first baffles.

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