Water cooling screen structure capable of improving crystal pulling rate

Abstract

The invention provides a water-cooling screen structure capable of improving the crystal pulling rate. The water-cooling screen structure comprises an inner conical barrel, an outer conical barrel, an upper bottom plate and a lower bottom plate, an annular cavity is formed between the inner conical barrel and the outer conical barrel, and the upper bottom plate and the lower bottom plate are of annular structures and are fixedly connected to the upper end and the lower end of the inner conical barrel and the upper end and the lower end of the outer conical barrel correspondingly, so that the annular cavity forms a closed cavity; a plurality of arc-shaped grooves and heat absorbing plates are uniformly arranged on the surface of the inner conical barrel; annular heat dissipation plates are evenly arranged on the surface, located on one side of the annular cavity, of the inner conical barrel. By means of the arc-shaped groove and the heat absorption plate arranged on the surface of the inner conical barrel, the heat absorption area of the surface of the inner conical barrel is increased, so that the heat absorption efficiency is improved, meanwhile, the heat dissipation plate arranged in the annular cavity increases the contact area of the heat dissipation surface and cooling water, and the heat dissipation efficiency is improved. Therefore, the heat dissipation efficiency is improved, the heat exchange performance of the water cooling screen is improved, and the crystal growth rate is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of single crystal production equipment, and specifically belongs to a water-cooled screen structure that can improve the crystal pulling rate. Background Art

[0002] The water-cooled screen is a commonly used speed-up device in the process of making single crystal rods in a single crystal furnace. The inner and outer surfaces of the conventional water-cooled screen are smooth and flat, and the effect of improving the pulling speed of single crystal rods of different sizes is limited. It is mainly restricted by the inner and outer surface areas of the water-cooled screen and the size of the water flow. The size of the outer surface area of the water-cooled screen represents its heat absorption capacity. The inner surface is in contact with the cooling water, and the contact area with the cooling water determines the heat dissipation capacity. Therefore, the heat transfer performance of the existing water-cooled screen is limited, and its heat transfer performance cannot be improved, making it difficult to improve the crystal pulling efficiency. Summary of the Invention

[0003] In order to overcome the problems in the background art, the present invention provides a water-cooled screen structure that can improve the crystal pulling rate, so as to solve the technical problems in the background art that the inner and outer surface areas of the current water-cooled screen are limited, its heat transfer performance is restricted, and its heat transfer performance cannot be improved, thus making it difficult to improve the crystal pulling efficiency.

[0004] To achieve the above object, the invention is realized through the following technical solutions: A water-cooled screen structure that can improve the crystal pulling rate, comprising an inner conical barrel 1, an outer conical barrel 2, an upper bottom plate 3, and a lower bottom plate 4; a circular chamber 5 is formed between the inner conical barrel 1 and the outer conical barrel 2, the upper bottom plate 3 and the lower bottom plate 4 are of circular structures and are respectively fixedly connected to the upper and lower ends of the inner conical barrel 1 and the outer conical barrel 2, so that the circular chamber 5 forms a closed cavity; a plurality of arc-shaped grooves 11 and heat absorption plates 12 are uniformly arranged on the surface of the inner conical barrel 1; a circular heat dissipation plate 13 is uniformly arranged on the surface of the inner conical barrel 1 on one side of the circular chamber 5; a water inlet pipe 6 and a water outlet pipe 7 are connected to the upper bottom plate 3, the water outlet pipe 7 is communicated with the top of the circular chamber 5, and the water inlet pipe 6 is communicated with the bottom of the circular chamber 5 through a connecting pipe 61.

[0005] Preferably, circular flow guiding plates 51 are uniformly arranged up and down in the circular chamber 5, and a plurality of independent circulation paths 52 are formed between the circular flow guiding plates 51; the heat dissipation plates 13 are uniformly distributed in each circulation path 52; through holes 53 for communicating between adjacent two circulation paths 52 are opened on the circular flow guiding plates 51; inclined partition plates 54 for facilitating the cooling water to flow in one direction are arranged in the circulation paths 52, the inclined partition plates 54 are arranged between the upper and lower through holes 53, and the upper and lower through holes 53 are respectively arranged on both sides of the inclined partition plates 54, and the water inlet pipe 6 is communicated with the lowermost circulation path 52, and the water outlet pipe 7 is communicated with the uppermost circulation path 52.

[0006] Preferably, an arc-shaped elastic metal sheet 8 for adjusting the water flow rate is installed in the circulation path 52. Both ends of the elastic metal sheet 8 are fixedly connected with guide shafts 81. Both ends of the guide shafts 81 are respectively slidably clamped in chutes 82 opened at the top and bottom of the circulation path 52. The chutes 82 are arranged along the edge of the outer side inner wall of the circulation path 52, so that the guide shafts 81 are close to the inner wall of the outer conical barrel 2. A bolt 9 for pushing the elastic metal sheet 8 to move is threadedly installed on the wall of the outer conical barrel 2.

[0007] Preferably, two elastic metal sheets 8 are arranged in one circulation path 52. The length of one elastic metal sheet 8 occupies a central angle of 135 - 165 degrees of the circulation path 52.

[0008] Preferably, the end of the bolt 9 is rotatably connected to the elastic metal sheet 8. The bolt 9 passes through a connection hole provided on the elastic metal sheet 8. Two limit pieces 91 are respectively arranged on both sides of the elastic metal sheet 8 on the bolt 9. Rotating the bolt 9 makes the limit pieces 91 on both sides push or pull the elastic metal sheet 8 to move.

[0009] Preferably, between the guide shafts 81 at both ends of the elastic metal sheet 8 installed in the circulation path 52 of the conical part and the inner wall of the outer conical barrel 2, there is a triangular stopper 10 fixedly connected to the inner wall of the outer conical barrel 2. The guide shafts 81 move along the vertical arc surface of the triangular stopper 10. A relatively airtight space is formed among the triangular stopper 10, the elastic metal sheet 8, and the inner wall of the outer conical barrel 2.

[0010] A method for adjusting the water flow rate in the circulation path 52 of the above-mentioned water-cooled screen. By rotating the bolt 9 to push the elastic metal sheet 8 to move, the guide shafts 81 at both ends of the elastic metal sheet 8 move along the chutes 82, so that the guide shafts 81 keep close to the inner wall of the outer conical barrel 2, and the middle part of the elastic metal sheet 8 is far from the inner wall of the outer conical barrel 2 and close to the inner wall of the inner conical barrel 1, so that a relatively airtight space is formed between the elastic metal sheet 8 and the inner wall of the outer conical barrel 2. During the movement of the elastic metal sheet 8, the cooling water flows along the gap between the elastic metal sheet 8 and the annular guide plate 51. Since the elastic metal sheet 8 is close to the inner wall of the inner conical barrel 1, the cross-sectional area of the circulation path 52 is reduced. From the pipe diameter flow velocity formula, Q = vA Q - Flow rate v - Flow velocity A - Cross-sectional area it can be known that when the flow rate is constant, the smaller the cross-sectional area, the larger the flow velocity. The movement of the elastic metal sheet 8 reduces the cross-sectional area of the water flow in the circulation path 52, so the flow velocity becomes larger, increasing the heat dissipation performance.

[0011] The beneficial effects of the present invention are as follows: By means of the arc-shaped grooves and heat-absorbing plates provided on the surface of the inner conical barrel, the heat-absorbing area of the surface of the inner conical barrel is increased, thereby improving the heat-absorbing efficiency. At the same time, the heat-dissipating plates provided in the annular chamber increase the contact area between the heat-dissipating surface and the cooling water, thereby improving the heat-dissipating efficiency, increasing the heat exchange performance of the water-cooled screen, further increasing the crystal growth rate, significantly improving the single output of the crystal rod per unit time, and effectively reducing the enterprise cost.

[0012] Also, the elastic metal sheets provided in the circulation path change the cross-sectional area of the water flow in different circulation paths, thereby changing the water flow velocity in each circulation path, so that the heat exchange performance at different positions of the water-cooled screen can be controlled, the heat exchange performance at different heights of the crystal rod can be adjusted according to the crystal pulling situation, and the quality of crystal rod stretching can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a three-dimensional structural schematic diagram of the present invention.

[0014] Figure 2 is a cross-sectional structural schematic diagram of the present invention.

[0015] Figure 3 is a cross-sectional three-dimensional structural schematic diagram of the annular chamber.

[0016] Figure 4 is a cross-sectional three-dimensional structural schematic diagram in which the circulation paths are interconnected.

[0017] Figure 5 is a mounting structural schematic diagram of the elastic metal sheet.

[0018] Figure 6 is an end connection structural schematic diagram of the elastic metal sheet.

[0019] Figure 7 is a connection structural schematic diagram of the bolt and the elastic metal sheet. DETAILED DESCRIPTION OF THE INVENTION

[0020] In order to make the objectives, technical solutions and beneficial effects of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the drawings to facilitate the understanding of those skilled in the art.

[0021] Such as Figure 1-7As shown in the figure, the present invention provides a water-cooled screen structure that can improve the crystal pulling rate, which includes an inner conical barrel 1, an outer conical barrel 2, an upper bottom plate 3, and a lower bottom plate 4. An annular chamber 5 is formed between the inner conical barrel 1 and the outer conical barrel 2. The upper bottom plate 3 and the lower bottom plate 4 are annular structures and are respectively fixedly connected to the upper and lower ends of the inner conical barrel 1 and the outer conical barrel 2, so that the annular chamber 5 forms a closed cavity. A plurality of arc-shaped grooves 11 and heat absorption plates 12 are uniformly arranged on the surface of the inner conical barrel 1. An annular heat dissipation plate 13 is uniformly arranged on the surface of the inner conical barrel 1 on one side of the annular chamber 5. A water inlet pipe 6 and a water outlet pipe 7 are connected to the upper bottom plate 3. The water outlet pipe 7 is communicated with the top of the annular chamber 5, and the water inlet pipe 6 is communicated with the bottom of the annular chamber 5 through a connecting pipe 61. When the water-cooled screen structure cools the crystal rod, cooling water is introduced from the water inlet pipe 6, enters the bottom of the annular chamber 5, and then flows upward along the annular chamber 5 and flows out from the water outlet pipe 7. The surface of the inner conical barrel 1 absorbs the heat of the crystal rod. The arc-shaped grooves 11 and heat absorption plates 12 arranged on the surface of the inner conical barrel 1 increase the heat absorption area of the surface of the inner conical barrel 1, thereby improving the heat absorption efficiency. The heat is transferred to the inner wall of the annular chamber 5. The heat dissipation plates 13 arranged in the annular chamber 5 increase the contact area between the heat dissipation surface and the cooling water, thereby improving the heat dissipation efficiency. The heat is carried away with the cooling water, thereby increasing the heat exchange performance of the water-cooled screen, and further improving the crystal growth rate. The single output of the crystal rod can be significantly improved per unit time, and the enterprise cost can be effectively reduced.

[0022] As Figure 1-3 shown, annular flow guiding plates 51 distributed up and down are uniformly arranged in the annular chamber 5. Multiple independent circulation paths 52 are formed between the annular flow guiding plates 51. The heat dissipation plates 13 are uniformly distributed in each circulation path 52. Through holes 53 for communicating between adjacent two circulation paths 52 are formed on the annular flow guiding plates 51. Inclined partition plates 54 for facilitating the cooling water to flow in one direction are arranged in the circulation paths 52. The inclined partition plates 54 are arranged between the upper and lower through holes 53. The upper and lower through holes 53 are respectively arranged on both sides of the inclined partition plates 54. The water inlet pipe 6 is communicated with the lowermost circulation path 52, and the water outlet pipe 7 is communicated with the uppermost circulation path 52. The cooling water enters the lowermost circulation path 52, is blocked by the inclined partition plate 54 after flowing in the circulation path 52 for one circle, and flows upward along the inclined partition plate 54 and flows into the upper circulation path 52 through the through hole 53. After flowing in this layer of circulation path 52 for one circle, it also flows upward along the inclined partition plate 54 and flows into the next layer of circulation path 52 through the through hole 53, so that the cooling water flows upward in sequence, realizing the circulating flow of the cooling water in the annular chamber 5, enabling the cooling water to circulate through each part of the water-cooled screen, making the cooling effect of the water-cooled screen on the crystal rod uniform and balanced, and improving the quality and efficiency of crystal rod stretching.

[0023] As Figure 5-7As shown, an arc-shaped elastic metal sheet 8 for adjusting the water flow rate is installed in the circulation path 52. (Only the elastic metal sheet 8 installed in one circulation path 52 is shown in the figure. The installation of the elastic metal sheet 8 in other circulation paths 52 is the same.) Both ends of the elastic metal sheet 8 are fixedly connected with guide shafts 81. Both ends of the guide shafts 81 are respectively slidably clamped in the chutes 82 opened at the top and bottom of the circulation path 52. The chutes 82 are arranged along the outer wall edge of the circulation path 52, so that the guide shafts 81 are close to the inner wall of the outer conical barrel 2. A bolt 9 for pushing the elastic metal sheet 8 to move is threadedly installed on the wall of the outer conical barrel 2. When it is necessary to adjust the water flow rate in different circulation paths 52, by turning the bolt 9, the bolt 9 pushes the elastic metal sheet 8 to move, and the guide shafts 81 at both ends move outwards in the chutes 82, so that the guide shafts 81 remain close to the inner wall of the outer conical barrel 2, and the middle part of the elastic metal sheet 8 moves away from the inner wall of the outer conical barrel 2 and approaches the inner wall of the inner conical barrel 1, so that a relatively airtight space is formed between the elastic metal sheet 8 and the inner wall of the outer conical barrel 2. During the movement of the elastic metal sheet 8, the cooling water flows along the gap between the elastic metal sheet 8 and the annular guide plate 51. Since the elastic metal sheet 8 is close to the inner wall of the inner conical barrel 1, the cross-sectional area of the circulation path 52 is reduced. Multiple bolts 9 can be set to push the elastic metal sheet 8 from different positions, so as to reduce the distance between the elastic metal sheet 8 and the wall of the inner conical barrel 1. When the cooling water flows in the circulation path 52, since a relatively airtight space is formed between the elastic metal sheet 8 and the inner wall of the outer conical barrel 2, the cooling water flows along the path between the inner wall of the inner conical barrel 1 and the elastic metal sheet 8. According to the pipe diameter flow rate formula, Q = vA Q - Flow rate v - Flow velocity A - Cross-sectional area it can be known that when the flow rate is constant, the smaller the cross-sectional area, the greater the flow velocity. The movement of the elastic metal sheet 8 reduces the cross-sectional area of the water flow in the circulation path 52, so that the flow velocity becomes larger, thereby changing the water flow velocity in each circulation path 52, and thus the heat exchange performance at different positions of the water-cooled screen can be controlled, and the heat exchange performance at different heights of the crystal bar can be adjusted according to the crystal pulling situation, improving the quality of crystal bar stretching. When adjusting the water flow rate in the water-cooled screen, it is necessary to adjust it in advance and then install the water-cooled screen in the single crystal furnace.

[0024] As Figure 5-7 shown, two elastic metal sheets 8 are arranged in one circulation path 52, and the central angle occupied by the length of one elastic metal sheet 8 in the circulation path 52 is 135 - 165 degrees. Arranging two elastic metal sheets 8 is convenient for adjustment. The length of the elastic metal sheet 8 is convenient to change the cross-sectional area of the circulation path 52 as long as possible, improve its effect of adjusting the flow rate, and improve the heat exchange efficiency of the water-cooled screen.

[0025] As Figure 5-7As shown, the end of the bolt 9 is rotatably connected to the elastic metal sheet 8. The bolt 9 passes through the connection hole provided on the elastic metal sheet 8, and two limiting sheets 91 are provided on the bolt 9, which are respectively located on both sides of the elastic metal sheet 8. Rotating the bolt 9 causes the limiting sheets 91 on both sides to push or pull the elastic metal sheet 8 to move.

[0026] As Figure 5-7 shown, between the guide shafts 81 at both ends of the elastic metal sheet 8 installed in the circulation passage 52 of the conical part and the inner wall of the outer conical barrel 2, there are triangular stoppers 10 fixedly connected to the inner wall of the outer conical barrel 2. The guide shafts 81 move along the vertical arc surface of the triangular stoppers 10. A relatively sealed space is formed among the triangular stoppers 10, the elastic metal sheet 8, and the inner wall of the outer conical barrel 2. The water flow is made to flow along the circulation passage between the inner wall of the inner conical barrel 1 and the elastic metal sheet 8, so that the water between the elastic metal sheet 8 and the outer conical barrel 2 wall is in a relatively static state.

[0027] A method for adjusting the water flow velocity in the circulation passage 52 of the above-mentioned water-cooled screen. By rotating the bolt 9 to push the elastic metal sheet 8 to move, the guide shafts 81 at both ends of the elastic metal sheet 8 move along the sliding groove 82, so that the guide shafts 81 keep close to the inner wall of the outer conical barrel 2, and the middle part of the elastic metal sheet 8 is far from the inner wall of the outer conical barrel 2 and close to the inner wall of the inner conical barrel 1, forming a relatively sealed space between the elastic metal sheet 8 and the inner wall of the outer conical barrel 2. During the movement of the elastic metal sheet 8, the cooling water flows along the gap between the elastic metal sheet 8 and the annular guide plate 51. Since the elastic metal sheet 8 is close to the inner wall of the inner conical barrel 1, the cross-sectional area of the circulation passage 52 is reduced. According to the pipe diameter flow velocity formula, Q = vA Q - Flow rate v - Flow velocity A - Cross-sectional area it can be known that when the flow rate is constant, the smaller the cross-sectional area, the greater the flow velocity. The movement of the elastic metal sheet 8 reduces the cross-sectional area of the water flow in the circulation passage, so the flow velocity becomes larger, increasing the heat dissipation performance.

[0028] Working process: When the water-cooled screen structure cools the crystal bar, cooling water is introduced from the water inlet pipe 6 and enters the bottom of the annular chamber 5. The cooling water enters the bottommost layer of the circulation path 52, flows in a circle in the circulation path 52, is blocked by the inclined partition 54, and then flows upward along the inclined partition 54 through the through hole 53 into the circulation path 52 of the upper layer. After flowing in a circle in the circulation path 52 of this layer, it also flows upward along the inclined partition 54 through the through hole 53 into the circulation path 52 of the next layer, so that the cooling water flows upward in sequence, realizing the circulating flow of the cooling water in the annular chamber 5, enabling the cooling water to circulate through each part of the water-cooled screen, and then flowing out from the water outlet pipe 7. The surface of the inner conical barrel 1 absorbs the heat of the crystal bar. The arc-shaped grooves 11 and heat-absorbing plates 12 provided on the surface of the inner conical barrel 1 increase the heat-absorbing area of the surface of the inner conical barrel 1, thereby improving the heat-absorbing efficiency. The heat is transferred to the inner wall of the annular chamber 5. The heat-dissipating plate 13 provided in the annular chamber 5 increases the contact area between the heat-dissipating surface and the cooling water, thereby improving the heat-dissipating efficiency. The heat is carried away with the cooling water, thus increasing the heat exchange performance of the water-cooled screen, further improving the crystal growth rate, significantly increasing the single output of the crystal bar per unit time, and effectively reducing the enterprise cost.

[0029] When it is necessary to adjust the water flow rate in different circulation paths 52, by turning the bolt 9, the bolt 9 is pushed to move the elastic metal sheet 8. The guiding shafts 81 at both ends move outward in the sliding grooves 82, so that the guiding shafts 81 keep close to the inner wall of the outer conical barrel 2. The middle part of the elastic metal sheet 8 moves away from the inner wall of the outer conical barrel 2 and approaches the inner wall of the inner conical barrel 1, forming a relatively sealed space between the elastic metal sheet 8 and the inner wall of the outer conical barrel 2. During the movement of the elastic metal sheet 8, the cooling water flows along the gap between the elastic metal sheet 8 and the annular flow guide plate 51. Since the elastic metal sheet 8 is close to the inner wall of the inner conical barrel 1, the cross-sectional area of the circulation path 52 is reduced, so the flow rate becomes larger, thereby changing the water flow rate in each circulation path 52, and thus the heat exchange performance at different positions of the water-cooled screen can be controlled, and the heat exchange performance at different heights of the crystal bar can be adjusted according to the crystal pulling situation, improving the quality of crystal bar stretching.

[0030] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A water-cooling shield structure capable of increasing the crystal pulling rate, characterized in that: The invention comprises an inner cone barrel (1), an outer cone barrel (2), an upper bottom plate (3), and a lower bottom plate (4); an annular chamber (5) is formed between the inner cone barrel (1) and the outer cone barrel (2); the upper bottom plate (3) and the lower bottom plate (4) are annular structures and are respectively fixedly connected to the upper and lower ends of the inner cone barrel (1) and the outer cone barrel (2), so that the annular chamber (5) forms a closed cavity; a plurality of arc-shaped grooves (11) and heat absorbing plates (12) are evenly arranged on the surface of the inner cone barrel (1); an annular heat dissipation plate (13) is evenly arranged on the surface of the inner cone barrel (1) located on one side of the annular chamber (5); a water inlet pipe (6) and a water outlet pipe (7) are connected to the upper bottom plate (3); the water outlet pipe (7) is connected to the top of the annular chamber (5), and the water inlet pipe (6) is connected to the bottom of the annular chamber (5) through a connecting pipe (61).

2. The water-cooling shield structure capable of increasing the crystal pulling rate according to claim 1, characterized in that: The annular chamber (5) is evenly provided with annular guide plates (51) distributed up and down, and a plurality of mutually independent circulation passages (52) are formed between the annular guide plates (51); the heat sink (13) is evenly distributed in each circulation passage (52); the annular guide plates (51) are provided with through holes (53) for connecting two adjacent circulation passages (52); the circulation passage (52) is provided with an inclined baffle (54) for facilitating the flow of cooling water in one direction, the inclined baffle (54) being arranged between the upper and lower through holes (53), and the upper and lower through holes (53) being arranged on both sides of the inclined baffle (54), respectively; the water inlet pipe (6) is connected to the circulation passage (52) of the lowest layer, and the water outlet pipe (7) is connected to the circulation passage (52) of the highest layer.

3. The water-cooling shield structure capable of increasing the crystal pulling rate according to claim 2, characterized in that: An arc-shaped elastic metal sheet (8) for adjusting the water flow speed is installed in the circulation passage (52), and guide shafts (81) are fixedly connected to both ends of the elastic metal sheet (8). Both ends of the guide shaft (81) are slidably clamped in slide grooves (82) provided at the top and bottom of the circulation passage (52), respectively. The slide grooves (82) are arranged along the outer inner wall edge of the circulation passage (52), so that the guide shaft (81) is close to the inner wall of the outer cone barrel (2); and bolts (9) for pushing the elastic metal sheet (8) to move are threadedly installed on the wall of the outer cone barrel (2).

4. The water-cooling shield structure capable of increasing the crystal pulling rate according to claim 3, characterized in that: Two elastic metal sheets (8) are arranged in a circulation passage (52), and the length of one elastic metal sheet (8) accounts for an angle of 135-165 degrees to the center of the circulation passage (52).

5. A water-cooling shield structure capable of increasing the crystal pulling rate according to claim 3 or 4, characterized in that: The end of the bolt (9) is rotatably connected to the elastic metal sheet (8), and the bolt (9) passes through a connection hole provided on the elastic metal sheet (8). The bolt (9) is provided with two limit plates (91) respectively located on both sides of the elastic metal sheet (8); when the bolt (9) is rotated, the limit plates (91) on both sides push or pull the elastic metal sheet (8) to move.

6. The water-cooling shield structure capable of increasing the crystal pulling rate according to claim 5, characterized in that: A triangular stopper (10) fixedly connected to the inner wall of the outer conical barrel (2) is provided between the guide shafts (81) at both ends of the elastic metal sheet (8) installed in the circulation passage (52) of the conical portion and the inner wall of the outer conical barrel (2); the guide shaft (81) moves along the vertical arc surface of the triangular stopper (10); and a relatively closed space is formed between the triangular stopper (10), the elastic metal sheet (8) and the inner wall of the outer conical barrel (2).

7. A method for regulating water flow velocity in a circulation passage (52) of a water-cooled shield structure according to claim 3, 4 or 6, characterized in that: The elastic metal sheet (8) is pushed to move by rotating the bolt (9), and the guide shafts (81) at both ends of the elastic metal sheet (8) move along the slide grooves (82), so that the guide shafts (81) are kept close to the inner wall of the outer cone barrel (2), and the middle of the elastic metal sheet (8) is away from the inner wall of the outer cone barrel (2) and close to the inner wall of the inner cone barrel (1), so that a relatively closed space is formed between the elastic metal sheet (8) and the inner wall of the outer cone barrel (2); during the movement of the elastic metal sheet (8), the cooling water flows along the gap between the elastic metal sheet (8) and the annular guide plate (51). Since the elastic metal sheet (8) is close to the inner wall of the inner cone barrel (1), the cross-sectional area of ​​the circulation passage (52) is reduced. According to the pipe diameter flow rate formula: Q = vA (Where Q is flow rate, v is flow velocity, and A is cross-sectional area) It can be seen that when the flow rate is constant, the smaller the cross-sectional area, the greater the flow rate; the movement of the elastic metal sheet (8) reduces the cross-sectional area of ​​the water flowing in the circulation passage (52), thereby increasing the flow rate and improving the heat dissipation performance.

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