An over-molded cavity product with a mold gating system

Abstract

The application provides a mold gating system for super multi-cavity products, which comprises primary distribution channels, secondary distribution channels and main channels. The main channels are connected with the primary distribution channels. The vertical channels are arranged in groups, and each group has more than one vertical channel. The vertical channels and the horizontal channels are combined into multiple rows of gating assemblies. Each row of the gating assemblies has multiple groups of vertical channels. In each row of the gating assemblies, the horizontal channels are distributed and connected between every two adjacent groups of vertical channels. The secondary distribution channels are distributed between every two adjacent rows of the gating assemblies and connected with the horizontal channels in the two rows of the gating assemblies respectively. The channel walls of the secondary distribution channels have narrowing parts for reducing the cross-sectional area of a part of the secondary distribution channels. The super multi-cavity products can be rapidly poured, and the pressure loss is significantly reduced. The narrowing parts in each secondary distribution channel prevent backflow, reduce shear and make the temperature and pressure of the whole molten glue more uniform.

Description

TECHNICAL FIELD

[0001] The present application relates to the injection molding technical field, and in particular, relates to a mold gating system for super multi-cavity products. BACKGROUND

[0002] In the polymer injection molding process, the melt glue is rapidly injected into the flow channel by the injection pressure, and then is poured into the mold cavity. The existing gating system usually requires that the pressure loss is as small as possible, so that the injection pressure can be uniformly transmitted to each part of the mold cavity, and thus a plastic product with clear shape and excellent quality can be obtained. Therefore, the length-diameter ratio of each gate is designed to be as small as possible.

[0003] However, for super multi-cavity products with more than 500 cavities, there are too many mold cavities that need to be poured. In order to improve the injection efficiency, the sub-flow channels extending from the main flow channel need to have sufficient length, so the length-diameter ratio of the sub-flow channels is large, and the pressure loss at the connection of each flow channel is also large, so a larger injection pressure is required. Moreover, during the polymer injection molding process, the melt glue is prone to backflow in the flow channel. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the present application provides a mold gating system for super multi-cavity products, which is suitable for the gating of super multi-cavity products with more than 500 cavities. The specific technical solutions are as follows:

[0005] A mold gating system for super multi-cavity products, comprising: a main flow channel, a first sub-flow channel, a second sub-flow channel, a plurality of horizontal flow channels, and a plurality of vertical flow channels, the main flow channel is connected to a plurality of first sub-flow channels, a plurality of vertical flow channels are arranged in multiple groups, each group has more than one vertical flow channel;

[0006] The multiple groups of vertical flow channels and the plurality of horizontal flow channels are combined into multiple rows of gating assemblies, each row of gating assembly has multiple groups of vertical flow channels, in each row of gating assembly, the horizontal flow channels are distributed and connected between each adjacent two groups of vertical flow channels, the second sub-flow channels are distributed between each two adjacent rows of gating assemblies and are connected to the horizontal flow channels on each adjacent two rows of gating assemblies, and the first sub-flow channel is connected to one of the second sub-flow channels, so that the main flow channel sequentially delivers the material to each group of vertical flow channels through the first sub-flow channel, the second sub-flow channel, and the horizontal flow channel.

[0007] Each second sub-flow channel has a narrowing portion on the flow channel wall for reducing the cross-sectional area of a part of the second sub-flow channel.

[0008] In a specific embodiment, the inner surface shape of the narrowing portion is a smooth transition surface.

[0009] In one specific embodiment, the narrowing section is located in the middle of the secondary branch.

[0010] In one specific embodiment, the secondary branch connected with the primary branch is set as a proximal secondary branch, the secondary branch far from the proximal secondary branch is set as a distal secondary branch, the ratio of the minimum cross-sectional area of the secondary branch at the narrowing section to the cross-sectional area of the non-narrowed part of the secondary branch is set as the narrowing degree, and the narrowing degrees of the narrowing sections from the proximal secondary branch to the distal secondary branch are the same or different.

[0011] In one specific embodiment, the narrowing degrees of the narrowing sections from the proximal secondary branch to the distal secondary branch gradually increase.

[0012] In one specific embodiment, the narrowing degrees of the narrowing sections from the proximal secondary branch to the distal secondary branch gradually increase in a linear gradient manner.

[0013] In one specific embodiment, the narrowing degree of the narrowing section of the secondary branch between the proximal secondary branch and the distal secondary branch is

[0014] Si = (S1 + Sk) * i / k

[0015] wherein S1 is the narrowing degree of the narrowing section of the proximal secondary branch, Sk is the narrowing degree of the narrowing section of the distal secondary branch, Sk > S1, i is the number of the i-th secondary branch counted from the proximal secondary branch, k is the total number of the secondary branches from the proximal secondary branch to the distal secondary branch, k > i, and Si is the narrowing degree of the narrowing section of the i-th secondary branch.

[0016] In one specific embodiment, the narrowing degree of the narrowing section of the proximal secondary branch is greater than 2 / 5, and the narrowing degree of the narrowing section of the distal secondary branch is less than 4 / 5.

[0017] In one specific embodiment, the group of vertical flow channels includes one vertical flow channel.

[0018] In one specific embodiment, the group of vertical flow channels includes two or more vertical flow channels combined into a bundle.

[0019] In one specific embodiment, in at least one row of pouring assembly, the cross flow channel connected with the secondary flow channel is set as a proximal cross flow channel, and the cross flow channel away from the proximal cross flow channel is a distal cross flow channel, and from the proximal cross flow channel to the distal cross flow channel, each cross flow channel has a wave-shaped flow channel wall recessed inward, two sides of the wave-shaped flow channel wall are respectively oppositely inclined to the corresponding connected vertical flow channel, and the inner surface shape of the wave-shaped flow channel wall is a smooth transition surface.

[0020] The present application has at least the following beneficial effects:

[0021] In the mold pouring system for super multi-mold cavity products in the present application, the flow channel includes a primary flow channel and a secondary flow channel, a main flow channel connects multiple primary flow channels, multiple vertical flow channels are arranged in multiple groups, each group has more than one vertical flow channel, the multiple groups of vertical flow channels and the multiple cross flow channels are combined into multiple rows of pouring assemblies, each row of pouring assembly has multiple groups of vertical flow channels, in each row of pouring assembly, the cross flow channel is distributed and connected between each adjacent two groups of vertical flow channels, the secondary flow channel is distributed between each two adjacent rows of pouring assemblies and connected to the cross flow channels on each adjacent two rows of pouring assemblies, and the primary flow channel is connected to one of the secondary flow channels, so as to realize the material delivery from the main flow channel to each group of vertical flow channels through the primary flow channel, the secondary flow channel and the cross flow channel. Compared with the prior art, the present application can realize the rapid pouring of super multi-mold cavities, shorten the total length of the intermediate flow channels such as the flow channel and the cross flow channel, and significantly reduce the pressure loss.

[0022] Furthermore, each secondary flow channel has a narrowing part on the flow channel wall for reducing the cross-sectional area of a part of the secondary flow channel. Since the cross-sectional area of the narrowing part is smaller than that of the non-narrowing part of the secondary flow channel, the molten glue backflow encounters a large resistance at the narrowing part, thereby effectively preventing the molten glue backflow, eliminating the defects of insufficient molten glue filling and welding marks, and significantly improving the yield rate and production efficiency. Moreover, each secondary flow channel has a narrowing part to achieve the effect of preventing backflow, which is better.

[0023] Further, the inner surface shape of the narrowing part is a smooth transition surface, which can reduce the shear.

[0024] Further, the gradually changing narrowing part can effectively prevent both the distal backflow and the proximal backflow, and the structure can also make the pressure of the proximal and distal flow channels more uniform, thereby making the temperature and pressure of the molten glue more uniform as a whole.

[0025] Furthermore, the narrowing part can reduce the cost of the flow channel material, and facilitate the regulation of backflow caused by different materials or processes through different degrees of gradual change and narrowing.

[0026] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are referred to as follows. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is an overall schematic diagram of the mold casting system for multi-cavity products in Example 1;

[0029] Figure 2 yes Figure 1 A schematic diagram of the left-center region;

[0030] Figure 3 yes Figure 2 A magnified view of a portion of the area at point D;

[0031] Figure 4 yes Figure 2 Enlarged view of a region at point E in the middle

[0032] Figure 5 This is a schematic diagram showing the connection between the crossflow channel and the vertical flow channel in Example 3;

[0033] Figure 6 yes Figure 5 A magnified view of a portion of area A in the middle;

[0034] Figure 7 yes Figure 5 A magnified view of a portion of the area at point B in the middle;

[0035] Figure 8 yes Figure 5 A magnified view of the area at point C.

[0036] Explanation of key component symbols:

[0037] 1-Mainstream Road;

[0038] 2- Primary distribution channel;

[0039] 3-Secondary diversion channel;

[0040] 4-Crossflow channel;

[0041] 5-Vertical flow channel;

[0042] 6-Proximal crossflow channel;

[0043] 7- The distal crossflow channel;

[0044] 8-Crossflow channel at the middle end;

[0045] 9-constriction;

[0046] 10-wavy channel wall. DETAILED DESCRIPTION

[0047] The application will be further described below in conjunction with specific embodiments. The accompanying drawings are only intended to illustrate the application and should not be understood as a limitation to the patent. In order to better illustrate the embodiments of the application, some components in the drawings are omitted, enlarged or reduced, and do not represent the actual size of the product. It is understandable for those skilled in the art that some well-known structures and their descriptions in the drawings can be omitted.

[0048] The same or similar reference numerals in the drawings of the embodiments of the application correspond to the same or similar components; in the description of the application, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "left", "right" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the position relationship in the drawings are only for illustrative purposes, and should not be understood as a limitation to the patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0049] The expressions used in various embodiments of the application, such as "first", "second", etc., can modify various constituent elements in various embodiments, but can not limit the corresponding constituent elements. For example, the above expressions do not limit the order and / or importance of the elements. The above expressions are only for the purpose of distinguishing one element from other elements. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, without departing from the scope of various embodiments of the application, a first element can be referred to as a second element, and similarly, a second element can be referred to as a first element.

[0050] It should be noted that in the present application, unless otherwise explicitly specified and defined, the terms "mounting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] Embodiment 1

[0052] As Figure 1 , Figure 2As shown, this embodiment provides a mold gating system for multi-cavity products, including: a main runner 1, primary runners 2, secondary runners 3, multiple cross runners 4, and multiple vertical runners 5. The main runner 1 connects to the multiple primary runners 2. For example, the main runner 1 connects to two primary runners 2, with one primary runner 2 located on the left side of the main runner 1 and the other primary runner 2 located on the right side of the main runner 1. The multiple vertical runners 5 are configured in multiple groups, with each group having more than one vertical runner 5. Multiple sets of vertical flow channels 5 and multiple sets of cross flow channels 4 are combined to form multiple rows of casting components. Each row of casting components has multiple sets of vertical flow channels 5. In each row of casting components, cross flow channels 4 are distributed and connected between each pair of adjacent sets of vertical flow channels 5. Secondary diversion channels 3 are distributed between each pair of adjacent rows of casting components and are respectively connected to the cross flow channels 4 on each pair of adjacent rows of casting components. Primary diversion channel 2 is connected to one of the secondary diversion channels 3, so that the main flow channel 1 conveys the material to each set of vertical flow channels 5 in sequence through the primary diversion channel 2, the secondary diversion channel 3, and the cross flow channel 4.

[0053] Compared with existing technologies, this method can achieve multi-cavity casting while reducing the total length of intermediate channels such as runners and cross runners, thereby reducing pressure loss caused by excessive length of intermediate channels and reducing pressure and temperature changes caused by shearing at multiple joints.

[0054] In this embodiment, a set of vertical flow channels 5 includes four vertical flow channels 5 bundled together. This is a preferred arrangement of the vertical flow channels 5. In other embodiments, a set of vertical flow channels 5 may also include two or more vertical flow channels 5 bundled together. In another embodiment, a set of vertical flow channels 5 may also include one vertical flow channel 5.

[0055] Each secondary flow channel 3 has a narrowing section 9 on its flow channel wall to reduce the cross-sectional area of ​​a portion of the secondary flow channel 3. The secondary flow channel 3 connected to the primary flow channel 2 is designated as the proximal secondary flow channel 3, and the secondary flow channel 3 farther from the proximal secondary flow channel 3 is designated as the distal secondary flow channel 3.

[0056] In this embodiment, since the cross-sectional area of ​​the narrowing section 9 is smaller than that of the non-narrowing section 9 in the secondary distribution channel 3, the molten adhesive backflow encounters significant resistance at the narrowing section 9, thus effectively preventing molten adhesive backflow, eliminating defects such as insufficient molten adhesive filling and weld line defects, and significantly improving yield and production efficiency. Moreover, each secondary distribution channel 3 has a narrowing section 9 to prevent backflow, meaning that both the near-end and far-end secondary distribution channels 3 have the function of preventing molten adhesive backflow, resulting in a better overall effect and facilitating more uniform pressure throughout the channel.

[0057] In the embodiment, the inner surface shape of the narrowing portion 9 is a smooth transition surface. Because the inner surface shape of the narrowing portion 9 is a smooth transition surface, the shear received by the molten glue can be reduced.

[0058] As shown in Figure 2 , the narrowing portion 9 is located in the middle of the secondary flow channel 3.

[0059] The narrowing degree of the narrowing portion 9 is set as the ratio of the minimum cross-sectional area of the secondary flow channel 3 at the narrowing portion 9 to the cross-sectional area of the secondary flow channel 3 at the non-narrowing portion 9. In the embodiment, the narrowing degrees of the narrowing portions 9 of the secondary flow channels 3 from the proximal end to the distal end are different.

[0060] Specifically, as shown in Figure 2 , Figure 3 and Figure 4 , the narrowing degrees of the narrowing portions 9 of the secondary flow channels 3 from the proximal end to the distal end gradually increase.

[0061] Preferably, the narrowing degrees of the narrowing portions 9 of the secondary flow channels 3 from the proximal end to the distal end gradually increase in a linearly gradual manner. In this way, the gradually narrowing portion 9 can effectively prevent both the distal reflux and the proximal reflux, and the linearly gradual change from the distal end to the proximal end can make the flow channel pressure of the glue inlet section and the distal pouring section more uniform.

[0062] In a preferred embodiment, the narrowing degree of the narrowing portion 9 of the secondary flow channel 3 between the proximal end and the distal end is

[0063] Si = (S1 + Sk) * i / k

[0064] wherein S1 is the narrowing degree of the narrowing portion 9 of the proximal end of the secondary flow channel 3, Sk is the narrowing degree of the narrowing portion 9 of the distal end of the secondary flow channel 3, Sk ≥ S1, i is the number of the i-th secondary flow channel 3 counted from the proximal end of the secondary flow channel 3, k is the total number of the secondary flow channels 3 from the proximal end of the secondary flow channel 3 to the distal end of the secondary flow channel 3, k ≥ i, and Si is the narrowing degree of the narrowing portion 9 of the i-th secondary flow channel 3. Based on the linearly gradual formula, the temperature and pressure of the molten glue in the plurality of flow channels can be made more uniform.

[0065] In a preferred embodiment, the narrowing degree of the narrowing portion 9 of the proximal end of the secondary flow channel 3 is greater than 2 / 5, and the narrowing degree of the narrowing portion 9 of the distal end of the secondary flow channel 3 is less than 4 / 5.

[0066] Embodiment 2

[0067] The main difference between the embodiment and embodiment 1 is that:

[0068] In this embodiment, the narrowing degree of each narrowing portion is the same from the proximal secondary branch to the distal secondary branch (not shown in the figure).

[0069] The other features in this embodiment are the same as those in Embodiment 1, and will not be described again.

[0070] Embodiment 3

[0071] The main difference between this embodiment and Embodiment 1 is that:

[0072] In this embodiment, as shown in Figures 5-8 , the cross-flow channels connected with the secondary branches in at least one row of pouring assemblies are set as proximal cross-flow channels 6, the cross-flow channels away from the proximal cross-flow channels 6 are distal cross-flow channels 7, and correspondingly, the cross-flow channels between the proximal cross-flow channels 6 and the distal cross-flow channels 7 are intermediate cross-flow channels 8. From the proximal cross-flow channels 6 to the distal cross-flow channels 7, each cross-flow channel has a wave-shaped flow channel wall 10 that is concave inward, the two sides of the wave-shaped flow channel wall 10 are respectively oppositely inclined to the corresponding connected vertical flow channels 5, and the inner surface shape of the wave-shaped flow channel wall 10 is a smooth transition surface.

[0073] Therefore, the angle between the cross-flow channel and the vertical flow channel 5 is controlled by the structure of the wave-shaped flow channel wall 10 of the cross-flow channel, thereby reducing the shear received by the molten glue, and the size of the shear can be controlled by the inclination angle, thereby facilitating the regulation of the backflow generated by different materials or processes, and making the temperature and pressure of the molten glue as a whole more uniform. Moreover, the inner surface shape of the wave-shaped flow channel wall 10 is a smooth transition surface, which can further reduce the shear.

[0074] Preferably, the two sides of the wave-shaped flow channel wall 10 are substantially symmetrical, so that the inclination angles between the two adjacent groups of vertical flow channels 5 and the wave-shaped flow channel wall 10 are substantially the same. Specifically, between the two adjacent groups of vertical flow channels 5, the inclination angle of one side of the wave-shaped flow channel wall 10 to one group of vertical flow channels 5 and the inclination angle of the other side of the wave-shaped flow channel wall 10 to the other group of vertical flow channels 5.

[0075] As shown in Figures 3-6 , from the proximal cross-flow channels 6 to the distal cross-flow channels 7, the concave degree of each wave-shaped flow channel wall 10 gradually decreases, so that the inclination angles of the two sides of the wave-shaped flow channel wall 10 to the corresponding connected vertical flow channels 5 gradually decrease. Therefore, the molten glue in the cross-flow channel is subjected to greater shear at the distal end and smaller shear at the proximal end, thereby making the temperature and pressure of the molten glue as a whole more uniform.

[0076] Specifically, the inclination angles of the two sides of the wave-shaped flow channel wall 10 between the proximal cross-flow channels 6 and the distal cross-flow channels 7 to the corresponding vertical flow channels 5 are

[0077] Ai = (A1 + Ak) * i / k

[0078] Wherein, A1 is the angle between the two sides of the wave-shaped flow channel wall 10 at the proximal end and the connected vertical flow channel 5, Ak is the angle between the two sides of the wave-shaped flow channel wall 10 at the distal end and the connected vertical flow channel 5, A1≥Ak, i is the number of the i-th horizontal flow channel counted from the proximal horizontal flow channel 6, k is the total number of the horizontal flow channels from the proximal horizontal flow channel 6 to the distal horizontal flow channel 7, k≥i, and Ai is the angle between the two sides of the i-th wave-shaped flow channel wall 10 and the connected vertical flow channel 5. Based on the angle relationship formula, the temperature and pressure of the whole melt glue can be made more uniform.

[0079] In this embodiment, the angle between the two sides of the wave-shaped flow channel wall 10 at the proximal end and the connected vertical flow channel 5 is less than 150°, and the angle between the two sides of the wave-shaped flow channel wall 10 at the distal end and the connected vertical flow channel 5 is greater than 90°.

[0080] In this embodiment, the length of the inwardly recessed area of the wave-shaped flow channel wall 10 is equal to the distance between the two adjacent groups of vertical flow channels 5.

[0081] The other features in this embodiment are the same as those in Embodiment 1 and will not be described again.

[0082] As can be understood by those skilled in the art, the modules or processes in the drawings are not necessarily essential for implementing the present application.

[0083] As can be understood by those skilled in the art, the modules in the device in the implementation scenario can be distributed in the device in the implementation scenario according to the description of the implementation scenario, or can be changed to be located in one or more devices different from the implementation scenario. The modules in the above implementation scenario can be combined into one module, or can be further split into multiple sub-modules.

[0084] The above-mentioned serial numbers of the present application are only for description, and do not represent the advantages and disadvantages of the implementation scenario.

[0085] The above disclosure is only a few specific implementation scenarios of the present application, but the present application is not limited thereto, and any changes that can be thought of by those skilled in the art should fall within the protection scope of the present application.

Claims

1. A mold gating system for an over-molded pod product, characterized by, The application relates to a casting assembly. The casting assembly comprises a main flow channel, a primary branch flow channel, a secondary branch flow channel, a plurality of horizontal flow channels and a plurality of vertical flow channels, the main flow channel is connected with the plurality of primary branch flow channels, the plurality of vertical flow channels are arranged in groups, and each group comprises one or more vertical flow channels; The plurality of groups of vertical flow channels and the plurality of horizontal flow channels are combined into a plurality of rows of casting assemblies, each row of casting assemblies comprises a plurality of groups of vertical flow channels, in each row of casting assemblies, the horizontal flow channels are distributed and connected between every two adjacent groups of vertical flow channels, the secondary branch flow channels are distributed between every two adjacent rows of casting assemblies and are connected with the horizontal flow channels in the two adjacent rows of casting assemblies respectively, and the primary branch flow channels are connected with one of the secondary branch flow channels so that the main flow channel sequentially passes through the primary branch flow channel, the secondary branch flow channel and the horizontal flow channel to deliver materials to the groups of vertical flow channels; Each secondary branch flow channel is provided with a narrowing part on a flow channel wall of the secondary branch flow channel, the narrowing part is used for reducing the cross-sectional area of a part of the secondary branch flow channel; The secondary branch flow channel connected with the primary branch flow channel is a proximal secondary branch flow channel, the secondary branch flow channels away from the proximal secondary branch flow channel are distal secondary branch flow channels, the ratio of the minimum cross-sectional area of the secondary branch flow channel at the narrowing part to the cross-sectional area of the non-narrowing part of the secondary branch flow channel is set as a narrowing degree, the narrowing degrees of the narrowing parts are different from the proximal secondary branch flow channel to the distal secondary branch flow channel; The narrowing degrees of the narrowing parts gradually increase in a linear gradient mode from the proximal secondary branch flow channel to the distal secondary branch flow channel; The narrowing degree of the narrowing part of the secondary branch flow channel between the proximal secondary branch flow channel and the distal secondary branch flow channel is ， wherein S1 is the narrowing degree of the narrowing part of the proximal secondary branch flow channel, Sk is the narrowing degree of the narrowing part of the distal secondary branch flow channel, Sk>=S1, i is the number of i secondary branch flow channels counted from the proximal secondary branch flow channel, k is the total number of secondary branch flow channels from the proximal secondary branch flow channel to the distal secondary branch flow channel, k>=i, and Si is the narrowing degree of the narrowing part of the i-th secondary branch flow channel; The narrowing degree of the narrowing part of the proximal secondary branch flow channel is greater than 2 / 5, and the narrowing degree of the narrowing part of the distal secondary branch flow channel is less than 4 / 5; The inner surface shape of the narrowing part is a smooth transition surface.

2. The over-molded pod product mold gating system of claim 1, wherein, The narrowing part is located in the middle of the secondary branch flow channel.

3. The over-molded pod product mold casting system of claim 1, wherein, One group of vertical flow channels comprises one vertical flow channel.

4. The over-molded pod product mold casting system of claim 1, wherein, One group of vertical flow channels comprises two or more vertical flow channels combined into a bundle.

5. The over-molded pod product mold casting system of claim 1, wherein, In at least one row of casting assemblies, the horizontal flow channels connected with the secondary branch flow channels are proximal horizontal flow channels, the horizontal flow channels away from the proximal horizontal flow channels are distal horizontal flow channels, each horizontal flow channel has a wave-shaped flow channel wall which is concave inward, the two sides of the wave-shaped flow channel wall are respectively oppositely inclined to the corresponding connected vertical flow channels, and the inner surface shape of the wave-shaped flow channel wall is a smooth transition surface.

Images