A mold with a hot spot air-cooled heat dissipation structure

Abstract

The present application provides a mold with a hot spot air-cooling heat dissipation structure, which relates to the technical field of die-casting molds and includes a mold, a cooling runner plate, a first intake pipe, a first exhaust pipe, and a hot spot heat dissipation component; the mold is provided with a molding cavity and a receiving cavity, the molding cavity is used for molding products, the cooling runner plate is attached to and connected to the inner wall of the receiving cavity, and the heat of the product in the molding cavity is transferred to the cooling runner plate; the cooling runner plate is provided with a cooling cavity, and both the first intake pipe and the first exhaust pipe are communicated with the cooling cavity of the cooling runner plate; the hot spot heat dissipation component includes a hot spot heat dissipation cylinder, the hot spot heat dissipation cylinder is communicated with the cooling cavity of the cooling runner plate, and a plurality of hot spot heat dissipation components are provided, and the plurality of hot spot heat dissipation components are located in the hot spot area of the mold. The present application can cool the hot spot area of the mold and improve the processing quality of products.

Description

Technical Field

[0001] This application relates to the technical field of die-casting molds, and particularly relates to a mold with a hot spot air-cooling structure. Background Art

[0002] A die-casting mold is a mold used in die-casting processes. Die-casting is a metal casting process in which molten metal is injected into the cavity of a mold under high pressure, causing it to quickly cool and solidify into a casting. Die-casting molds usually need to withstand high pressure and high temperature, so they are usually made of high-strength steel and are designed to be able to withstand the thermal stress caused by high-pressure injection and rapid cooling. Die-casting molds are characterized by high production efficiency, good surface quality of castings, high dimensional accuracy, and are suitable for producing small or medium-sized castings with complex shapes.

[0003] In related technologies, a die-casting mold generally includes a fixed mold and a movable mold. When the fixed mold and the movable mold are closed, a complete forming cavity is formed, and then the molten metal is pushed into the interior of the forming cavity. After cooling, the molten metal solidifies into a shape. To accelerate the forming speed, a cooling device, such as a water-cooling device or an air-cooling device, is generally installed on the die-casting mold, and the die-casting mold is cooled through the cooling device, thereby improving the processing efficiency.

[0004] During the casting process, due to the nodes or local areas where the metal inside the casting solidifies slowly, hot spots are likely to form, resulting in shrinkage porosity in the hot spot area of the casting and affecting the product quality. When the cooling device in related technologies cools the forming cavity, it is difficult to cool the hot spot area specifically, and it is easy to cause uneven cooling in different areas of the forming cavity, affecting the processing quality of the final product. Summary of the Invention

[0005] In order to cool the hot spot area of the mold, improve the uneven cooling in different areas of the forming cavity, and enhance the processing quality of the product, this application provides a mold with a hot spot air-cooling structure.

[0006] This application provides a mold with a hot spot air-cooling structure, adopting the following technical solution:

[0007] A mold with a hot spot air-cooling structure includes a mold, a cooling runner plate, a first air inlet pipe, a first air outlet pipe, and a hot spot heat dissipation assembly; the mold is provided with a forming cavity and a receiving cavity, the forming cavity is used for forming a product, the cooling runner plate is attached to and connected with the inner wall of the receiving cavity, and the heat of the product in the forming cavity is transferred to the cooling runner plate; the cooling runner plate is provided with a cooling cavity, and both the first air inlet pipe and the first air outlet pipe are communicated with the cooling cavity of the cooling runner plate;

[0008] The hot spot heat dissipation component includes a hot spot heat dissipation cylinder, which is communicated with the cooling cavity of the cooling channel plate. A plurality of hot spot heat dissipation components are provided, and the plurality of hot spot heat dissipation components are located in the hot spot area of the mold.

[0009] By adopting the above technical solution, gas enters the cooling cavity of the cooling channel plate from the first intake pipe. The heat of the product in the molding cavity is transferred to the cooling channel plate, and the gas takes away the heat and is discharged from the first outlet pipe. The hot spot heat dissipation cylinder is located in the hot spot area of the mold, and the gas in the cooling cavity enters the hot spot heat dissipation cylinder, thereby performing targeted heat dissipation on the hot spot area, reducing the shrinkage porosity phenomenon caused by the too high temperature in the hot spot area, and improving the quality of the product.

[0010] Optionally, a plurality of cooling channel plates are provided, and the cooling channel plates are respectively arranged on the top side and the peripheral side of the accommodating cavity. The cooling channel plate on the top side of the accommodating cavity is communicated with the cooling channel plate on the peripheral side of the accommodating cavity. The first intake pipe is communicated with the cooling channel plate on the top side of the accommodating cavity, and the first outlet pipe is communicated with the cooling channel plate on the peripheral side of the accommodating cavity.

[0011] By adopting the above technical solution, the cooling channel plates are arranged on the top side and the peripheral side of the accommodating cavity, and the first intake pipe is communicated with the cooling channel plate on the top side of the accommodating cavity, ensuring that the cooling gas first reaches the top of the mold and then flows to the surrounding, so that the cooling gas can cool the top side and the peripheral side of the accommodating cavity.

[0012] Optionally, the hot spot heat dissipation cylinder is connected with a support plate. A plurality of support plates are provided, and the plurality of support plates enclose an inner cavity, and the hot spot heat dissipation cylinder is communicated with the inner cavity;

[0013] The support plate and the cooling channel plate are arranged at intervals, and a hot spot throttle channel is formed between the support plate and the cooling channel plate. The hot spot throttle channel is respectively communicated with a second intake pipe and a second outlet pipe, and the second outlet pipe is communicated with the inner cavity.

[0014] By adopting the above technical solution, the gas in the cooling cavity enters the hot spot heat dissipation cylinder, thereby bringing the heat in the hot spot area into the hot spot heat dissipation cylinder. The hot spot heat dissipation cylinder dissipates a part of the heat into the hot spot throttle channel, and the hot spot heat dissipation cylinder dissipates another part of the heat into the inner cavity. Gas enters the hot spot throttle channel from the second intake pipe, and after taking away the heat dissipated by the hot spot heat dissipation cylinder, it is discharged from the second outlet pipe, thereby being able to improve the heat dissipation capacity of the hot spot area, reduce the shrinkage porosity phenomenon of the product, and improve the product quality.

[0015] Optionally, heat dissipation fins are connected to the outside of the hot spot heat dissipation cylinder, and the heat dissipation fins are located in the hot spot throttle channel.

[0016] By adopting the above technical solution, the setting of the heat sink increases the heat exchange area between the hot spot heat dissipation cylinder and the gas in the hot throttle channel, improves the heat exchange efficiency, effectively reduces the temperature of the hot spot area, and reduces the occurrence of shrinkage porosity in the hot spot area of the product.

[0017] Optionally, a spiral blade is connected inside the hot spot heat dissipation cylinder, and the air flow flows along the spiral blade when passing through the hot spot heat dissipation cylinder.

[0018] By adopting the above technical solution, the air flow flows along the spiral blade when passing through the hot spot heat dissipation cylinder, which can increase the contact area and time between the gas and the hot spot heat dissipation cylinder, thereby improving the heat transfer efficiency.

[0019] Optionally, the cooling flow channel plate includes a heat conducting plate and a flow channel cavity plate. The heat conducting plate is attached to the inner wall of the accommodating cavity, the flow channel cavity plate is connected to the heat conducting plate, and the cooling cavity is located inside the flow channel cavity plate.

[0020] By adopting the above technical solution, the heat conducting plate is attached to the inner wall of the accommodating cavity, effectively transferring the heat to the flow channel cavity plate, and the gas can flow in the cooling cavity, thereby taking away the heat.

[0021] Optionally, the hot spot heat dissipation cylinder is communicated with an air inlet port and an air outlet port, the flow channel cavity plate is communicated with a plurality of connecting nozzles, and the air inlet port is threadedly connected and communicated with the connecting nozzles; the air outlet port passes through the support plate, and a connecting nut is threadedly connected to the air outlet port, and the connecting nut abuts against the support plate.

[0022] By adopting the above technical solution, by screwing the hot spot heat dissipation cylinder, the air inlet port can be threadedly connected and communicated with the connecting nozzles, and then by screwing the connecting nut, the support plate can be installed with the hot spot heat dissipation cylinder, making the installation operation more convenient and improving the installation efficiency.

[0023] Optionally, the number of the connecting nozzles is more than the number of the hot spot heat dissipation cylinders. A part of the connecting nozzles is communicated with the hot spot heat dissipation cylinders, and the support plate is provided with connecting bolts, and the connecting bolts are threadedly connected to the other part of the connecting nozzles and block the connecting nozzles.

[0024] By adopting the above technical solution, in the hot spot area, the connecting nozzles are communicated with the hot spot heat dissipation cylinders, so as to perform targeted cooling on the hot spot area. In the non-hot spot area, the connecting bolts are used to block the connecting nozzles, reducing the leakage of the gas in the cooling cavity into the hot throttle channel, and also improving the connection strength and connection stability between the support plate and the flow channel cavity plate.

[0025] Optionally, a connecting angle steel is connected between adjacent support plates, and the connecting angle steel seals the joint between adjacent support plates.

[0026] By adopting the above technical solution, the connecting angle steel seals the joint between adjacent support plates, reducing the gas leakage between the hot throttle channel and the inner cavity, ensuring the airflow stability and cooling effect in the hot throttle channel, and also improving the connection strength between adjacent support plates.

[0027] Optionally, the cooling channel plate further includes a heat dissipation net, which is disposed in the cooling cavity and connected to the inner wall of the channel cavity plate.

[0028] By adopting the above technical solution, the heat dissipation net is disposed in the cooling cavity and connected to the inner wall of the channel cavity plate, increasing the heat exchange area, improving the heat exchange efficiency, and being beneficial to dissipating the heat of the product in the molding cavity.

[0029] In summary, the present application includes at least one of the following beneficial effects:

[0030] 1. The heat of the product in the molding cavity is transferred to the cooling cavity of the channel cavity plate through the heat conduction plate. The gas enters the cooling cavity of the channel cavity plate from the first intake pipe and can take away the heat, and then the gas is discharged from the first outlet pipe, ensuring that the heat in the molding cavity is effectively dissipated and improving the cooling efficiency;

[0031] 2. After the gas enters the cooling cavity from the first intake pipe, it enters the hot section heat dissipation cylinder through the communicating nozzle and the intake pipe opening. The heat dissipation fins dissipate the heat into the hot throttle channel, and the spiral blades guide the airflow to flow along the spiral path, ensuring that the heat is taken away efficiently; by arranging a plurality of hot section heat dissipation cylinders in the hot section area of the mold, precise cooling of the hot section area is achieved, effectively reducing problems such as casting shrinkage porosity and cracks caused by uneven cooling, and improving the quality and performance of the product;

[0032] 3. The gas enters the hot throttle channel from the second intake pipe, and the gas takes away the heat of the hot section heat dissipation component, and then the gas enters the inner cavity through the second outlet pipe, improving the heat dissipation ability of the hot section heat dissipation component. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is the overall structural schematic diagram of the mold with the hot section air-cooled heat dissipation structure in the embodiment of the present application;

[0034] Figure 2 is the exploded structural schematic diagram of the hot section air-cooled heat dissipation structure and the mold in the embodiment of the present application;

[0035] Figure 3 is the sectional structural schematic diagram of the hot section air-cooled heat dissipation structure in the embodiment of the present application;

[0036] Figure 4 is the exploded structural schematic diagram of a part of the hot section air-cooled heat dissipation structure in the embodiment of the present application;

[0037] Figure 5 is Figure 3 an enlarged structural schematic diagram of part A in

[0038] Figure 6 a sectional structural schematic diagram of the hot spot heat dissipation component of the embodiment of the present application.

[0039] Explanation of reference numerals: 1, mold; 11, accommodation cavity; 2, cooling runner plate; 21, heat conduction plate; 22, runner cavity plate; 23, connecting air nozzle; 24, heat dissipation net; 3, first intake pipe; 4, first exhaust pipe; 5, second intake pipe; 6, second exhaust pipe; 7, hot spot heat dissipation component; 71, hot spot heat dissipation cylinder; 72, intake pipe opening; 73, exhaust pipe opening; 74, heat dissipation fin; 75, spiral blade; 76, connecting nut; 8, support plate; 81, hot spot runner; 82, inner cavity; 9, connecting bolt; 100, connecting angle steel. Detailed implementation manners

[0040] The following Figures 1 to 6 is a further detailed description of the present application.

[0041] The embodiment of the present application provides a mold with a hot spot air-cooled heat dissipation structure.

[0042] Referring to Figure 1 and Figure 2 , the mold with a hot spot air-cooled heat dissipation structure includes a mold 1 and a hot spot air-cooled heat dissipation structure. The mold 1 in this embodiment is described by taking the fixed mold as an example. In other implementation manners of this embodiment, the mold 1 can also be a moving mold. The top side and the peripheral side of the mold 1 are provided with a molding cavity for molding products. An accommodation cavity 11 is opened inside the mold 1, and the hot spot air-cooled heat dissipation structure is located in the accommodation cavity 11 to dissipate heat from the mold 1.

[0043] Referring to Figure 3 and Figure 4 , the hot spot air-cooled heat dissipation structure includes a cooling runner plate 2, a first intake pipe 3 and a first exhaust pipe 4. The cooling runner plate 2 includes a heat conduction plate 21, a runner cavity plate 22, a connecting air nozzle 23 and a heat dissipation net 24. The cooling runner plate 2 is located in the accommodation cavity 11. The heat conduction plate 21 is attached to and fixedly connected to the inner wall of the accommodation cavity 11. The runner cavity plate 22 is fixedly connected to the heat conduction plate 21. A cooling cavity is opened inside the runner cavity plate 22. The heat dissipation net 24 is located in the cooling cavity and is fixedly connected to the inner wall of the cooling cavity. The heat conduction plate 21 is made of a material with high heat conduction, which is beneficial to transferring the heat of the product in the molding cavity to the cooling cavity of the runner cavity plate 22.

[0044] Referring to Figure 2 and Figure 3, in this embodiment, a plurality of cooling channel plates 2 are provided. The cooling channel plates 2 are respectively located on the top side and the peripheral side of the accommodating cavity 11, so as to absorb the heat on the top side and the peripheral side of the accommodating cavity 11. The first intake pipe 3 is communicated with the cooling cavity of the cooling channel plate 2 on the top side of the accommodating cavity 11. The first intake pipe 3 is externally connected to a gas source. The cooling cavity of the cooling channel plate 2 on the top side of the accommodating cavity 11 is communicated with the cooling cavity of the cooling channel plate 2 on the peripheral side of the accommodating cavity 11. The cooling cavity of the cooling channel plate 2 on the peripheral side of the accommodating cavity 11 is communicated with the first exhaust pipe 4.

[0045] Reference Figure 3 and Figure 4 , the hot spot air-cooled heat dissipation structure further includes a support plate 8. The support plate 8 is arranged in the accommodating cavity 11. The support plate 8 is arranged at an interval from the flow channel cavity plate 22. A plurality of support plates 8 are provided. The support plates 8 are respectively located on the top side and the peripheral side of the accommodating cavity 11. The plurality of support plates 8 surround to form an inner cavity 82. A heat throttling channel 81 is formed between the support plate 8 and the flow channel cavity plate 22. A connecting angle steel 100 is arranged at the joint of adjacent support plates 8. The connecting angle steel 100 is fixedly connected to the adjacent support plates 8, so as to improve the sealing performance of the adjacent support plates 8 at the joint. The heat throttling channel 81 is communicated with a second intake pipe 5 and a second exhaust pipe 6. The second intake pipe 5 is externally connected to a gas source. The second exhaust pipe 6 is connected to the support plate 8 on the top side of the accommodating cavity 11. The second exhaust pipe 6 is communicated with the inner cavity 82. The bottom side of the inner cavity 82 is communicated with the outside. The gas enters the heat throttling channel 81 from the second intake pipe 5, and then the gas enters the inner cavity 82 from the second exhaust pipe 6, and finally is discharged to the outside.

[0046] Reference Figure 5 and Figure 6, the hot spot air-cooled heat dissipation structure further includes a hot spot heat dissipation component 7. The hot spot heat dissipation component 7 is arranged between the runner cavity plate 22 and the support plate 8. The hot spot heat dissipation component 7 includes a hot spot heat dissipation cylinder 71, an air inlet port 72, an air outlet port 73, heat dissipation fins 74, a spiral blade 75, and a connecting nut 76. The air inlet port 72 and the air outlet port 73 are respectively communicated with both ends of the hot spot heat dissipation cylinder 71. The communicating nozzle 23 is communicated with the runner cavity plate 22. The air inlet port 72 is threadedly connected to and communicated with the communicating nozzle 23. The air outlet port 73 passes through the support plate 8, and the air outlet port 73 is communicated with the inner cavity 82. The connecting nut 76 is threadedly connected to the air outlet port 73, and the connecting nut 76 and the hot spot heat dissipation cylinder 71 clamp the support plate 8, thereby fixing the position of the support plate 8. The heat dissipation fins 74 are fixedly connected to the outer wall of the hot spot heat dissipation cylinder 71. The spiral blade 75 is located inside the hot spot heat dissipation cylinder 71, and the spiral blade 75 is fixedly connected to the inner wall of the hot spot heat dissipation cylinder 71. The gas in the cooling cavity of the runner cavity plate 22 enters the hot spot heat dissipation cylinder 71 through the communicating nozzle 23 and the air inlet port 72. The gas flows along the spiral blade 75 inside the hot spot heat dissipation cylinder 71. The heat dissipation fins 74 can dissipate a part of the heat into the hot spot runner 81, and then the gas flows into the inner cavity 82 through the air outlet port 73. The gas entering from the second air inlet pipe 5 flows through the hot spot channel, thereby taking away the heat dissipated by the heat dissipation fins 74.

[0047] Reference Figure 4 and Figure 5 , a plurality of communicating nozzles 23 are arranged in an array on the runner cavity plate 22. The hot spot heat dissipation component 7 is located in the hot spot area, that is, the communicating nozzles 23 located in the hot spot area pass the gas in the cooling cavity of the runner cavity plate 22 into the inner cavity 82 through the hot spot heat dissipation component 7, so that the hot spot heat dissipation component 7 can perform targeted cooling on the hot spot area. For the communicating nozzles 23 in the non-hot spot area, the support plate 8 is provided with connecting bolts 9. The connecting bolts 9 are threadedly connected to the communicating nozzles 23 in the non-hot spot area, and the connecting bolts 9 block the communicating nozzles 23 in the non-hot spot area. The connecting bolts 9 can improve the connection strength between the support plate 8 and the runner cavity plate 22.

[0048] Reference Figure 2 and Figure 5 , for the present application, different molds 1 have different forming cavities, so the hot spot areas of different molds 1 are also different. Calculate the hot spot area of the mold 1 in advance, and then install the hot spot heat dissipation component 7 in the hot spot area and the connecting bolts 9 in the non-hot spot area, so that targeted heat dissipation can be performed on the hot spot area, making a set of hot spot air-cooled heat dissipation structure of the present application adaptable to different molds 1. That is to say, the hot spot air-cooled heat dissipation structure of the present application can be mass-produced, and then the positions of the hot spot heat dissipation component 7 and the connecting bolts 9 can be adjusted adaptively according to the hot spot area of the mold 1, thereby improving the versatility of the hot spot air-cooled heat dissipation structure of the present application.

[0049] The implementation principle of a mold with a hot spot air-cooled heat dissipation structure in an embodiment of the present application is as follows: The heat of the product in the molding cavity is transferred to the runner cavity plate 22 through the heat conduction plate 21. Gas enters the cooling cavity of the runner cavity plate 22 from the first intake pipe 3, takes away the heat in the cooling cavity, and is discharged from the first outlet pipe 4. In the hot spot area, the gas in the cooling cavity of the runner cavity plate 22 enters the hot spot heat dissipation cylinder 71 through the communication nozzle 23 and the intake pipe orifice 72. The heat dissipation fins 74 dissipate the heat into the hot spot channel. The gas in the hot spot heat dissipation cylinder 71 enters the inner cavity 82 through the outlet pipe orifice 73. Gas enters the hot spot channel from the second intake pipe 5, takes away the heat, and flows into the inner cavity 82 from the second outlet pipe 6, and finally is discharged to the outside.

[0050] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A mold with a heat-sink air-cooling structure, characterized in that: The invention comprises a mold (1), a cooling flow channel plate (2), a first air inlet pipe (3), a first air outlet pipe (4) and a heat dissipation component (7); the mold (1) is provided with a molding cavity and a receiving cavity (11), the molding cavity is used to mold a product, the cooling flow channel plate (2) is attached to and connected to the inner wall of the receiving cavity (11), and the heat of the product in the molding cavity is transferred to the cooling flow channel plate (2); the cooling flow channel plate (2) is provided with a cooling cavity, and the first air inlet pipe (3) and the first air outlet pipe (4) are both connected to the cooling cavity of the cooling flow channel plate (2); The heat node heat dissipation component (7) comprises a heat node heat dissipation cylinder (71), the heat node heat dissipation cylinder (71) is in communication with the cooling cavity of the cooling channel plate (2), a plurality of the heat node heat dissipation components (7) are provided, and the plurality of heat node heat dissipation components (7) are located in the heat node area of ​​the mold (1); A plurality of cooling channel plates (2) are provided, and the cooling channel plates (2) are respectively provided on the top side and the peripheral side of the accommodating cavity (11); the cooling channel plate (2) on the top side of the accommodating cavity (11) is communicated with the cooling channel plate (2) on the peripheral side of the accommodating cavity (11); the first air inlet pipe (3) is communicated with the cooling channel plate (2) on the top side of the accommodating cavity (11); and the first air outlet pipe (4) is communicated with the cooling channel plate (2) on the peripheral side of the accommodating cavity (11); The heat-node heat dissipation cylinder (71) is connected to a support plate (8), a plurality of the support plates (8) are provided, and the plurality of the support plates (8) are combined to form an inner cavity (82), and the heat-node heat dissipation cylinder (71) is in communication with the inner cavity (82); The support plate (8) and the cooling channel plate (2) are arranged at intervals, and a thermal throttling channel (81) is formed between the support plate (8) and the cooling channel plate (2), and the thermal throttling channel (81) is respectively connected to a second air inlet pipe (5) and a second air outlet pipe (6), and the second air outlet pipe (6) is connected to the inner cavity (82).

2. The mold with a heat-sink air-cooling structure according to claim 1, characterized in that: A heat sink (74) is connected to the outside of the heat node heat dissipation cylinder (71), and the heat sink (74) is located in the heat node flow channel (81).

3. The mold with a heat-sink air-cooling structure according to claim 1, characterized in that: The heat-node heat-dissipating cylinder (71) is connected to a spiral blade (75), and the airflow flows along the spiral blade (75) when passing through the heat-node heat-dissipating cylinder (71).

4. The mold with a heat-sink air-cooling structure according to claim 1, characterized in that: The cooling channel plate (2) comprises a heat conducting plate (21) and a channel cavity plate (22); the heat conducting plate (21) is in contact with the inner wall of the accommodating cavity (11); the channel cavity plate (22) is connected to the heat conducting plate (21); and the cooling cavity is located in the channel cavity plate (22).

5. The mold with a heat-sink air-cooling structure according to claim 4, characterized in that: The heat dissipation tube (71) of the heat node is connected to an air inlet pipe opening (72) and an air outlet pipe opening (73); the flow channel cavity plate (22) is connected to a plurality of connecting air nozzles (23); the air inlet pipe opening (72) is threadedly connected and connected to the connecting air nozzles (23); the air outlet pipe opening (73) passes through the support plate (8); the air outlet pipe opening (73) is threadedly connected to a connecting nut (76); the connecting nut (76) is pressed against the support plate (8).

6. The mold with a heat-sink air-cooling structure according to claim 5, characterized in that: The number of the communicating air nozzles (23) is greater than the number of the heat-sink heat-dissipating cylinders (71); a portion of the communicating air nozzles (23) are in communication with the heat-sink heat-dissipating cylinders (71); the support plate (8) is provided with connecting bolts (9); the connecting bolts (9) are threadedly connected to another portion of the communicating air nozzles (23) and seal the communicating air nozzles (23).

7. The mold with a heat-sink air-cooling structure according to claim 1, characterized in that: A connecting angle steel (100) is connected between adjacent support plates (8), and the connecting angle steel (100) seals the joints between adjacent support plates (8).

8. The mold with a heat-sink air-cooling structure according to claim 4, characterized in that: The cooling channel plate (2) further comprises a heat dissipation net (24), wherein the heat dissipation net (24) is arranged in the cooling cavity, and the heat dissipation net (24) is connected to the inner wall of the channel cavity plate (22).

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