A multi-cavity injection mold

Abstract

The present application relates to the technical field of plastic state forming, and discloses a multi-cavity injection mold, comprising a fixed mold, a movable mold, a mold core and an insert, the insert comprising a cigarette holder mold body and a mold base, the cigarette holder mold body comprising a cigarette cartridge magazine mold part and a curved suction nozzle shell mold part, a cigarette cartridge magazine water channel is formed in the cigarette cartridge magazine mold part, and a curved suction nozzle water channel is formed in the curved suction nozzle shell mold part; the curved suction nozzle water channel comprises: a curved suction nozzle water inlet water channel, which is vertically arranged at the connecting part of the cigarette cartridge magazine mold part and the curved suction nozzle shell mold part; a curved suction nozzle water outlet water channel, which is vertically arranged at the connecting part of the cigarette cartridge magazine mold part and the curved suction nozzle shell mold part; a straight water channel, which is located in the curved suction nozzle shell mold part near one side of the cigarette cartridge magazine mold part; and an elliptical water channel 1, which is located in the curved suction nozzle shell mold part. The present application achieves the goal of slowing down the flow rate of cooling water in a narrow water channel, prolonging the heat exchange time under the same amount of cooling water, reducing resource waste, and improving the cooling efficiency of the insert.

Description

Technical Field

[0001] The present application relates to the technical field of plastic state molding, and in particular to a multi-cavity injection mold. Background Art

[0002] The processing method of electronic cigarette shells is often injection molding. The materials of electronic cigarette plastic shells are mostly high-temperature materials. The temperature of high-temperature materials can easily cause problems in injection molding. During the injection molding process, the main problem is that the mold cooling effect is not ideal. Therefore, the design of the cooling water channel on the electronic cigarette insert in the injection mold is particularly important. The cooling water channel can quickly take away the heat, so that the cooling efficiency of the mold can be greatly improved, the dimensional accuracy of the product is also improved, and the yield rate will be guaranteed.

[0003] However, in the process of implementing relevant technical solutions, it was found that there were at least the following technical problems: there were "innate" problems in the design of the electronic cigarette shell inserts. The size of the electronic cigarette shell inserts was small, and the length of the water channel was easily limited in the limited space, which would cause the cooling water to flow out of the inserts quickly. The cooling water was less effective in taking away heat, and for multi-cavity injection molds, multiple cavities would be injected at the same time, and the overall mold temperature would rise. Therefore, for the electronic cigarette mold, the simultaneous injection of multiple cavities and the space limitation of the insert water channel design both affected the cooling efficiency of the mold, resulting in a longer cooling time. Summary of the Invention

[0004] The present application solves the technical problems in the prior art of simultaneous multi-cavity injection molding and space limitations in the design of insert water channels, which lead to reduced cooling efficiency, by providing a multi-cavity injection mold. It achieves the goal of slowing down the flow rate of cooling water in narrow water channels, extending the heat exchange time under the same amount of cooling water, reducing resource waste, and improving insert cooling efficiency.

[0005] The present application provides a multi-cavity injection mold, comprising a fixed mold, a movable mold, a mold core and an insert, wherein the insert is installed on the mold core, the insert comprises a plurality of cigarette holder mold bodies and a mold base for supporting the plurality of cigarette holder mold bodies, the cigarette holder mold body comprises a cigarette cartridge magazine mold part and a curved suction nozzle shell mold part, a cigarette cartridge magazine water path is formed in the cigarette cartridge magazine mold part, and a curved suction nozzle shell mold part is formed in the curved suction nozzle water path; the curved suction nozzle water path comprises: a curved suction nozzle water inlet path, which is vertically arranged at the connecting part of the cigarette cartridge magazine mold part and the curved suction nozzle shell mold part, and is connected to the upstream of the water flow in the cigarette cartridge magazine water path; a curved suction nozzle water path, which is vertically arranged at the connecting part of the cigarette cartridge magazine mold part and the curved suction nozzle shell mold part, and is connected to the upstream of the water flow in the cigarette cartridge magazine water path; a curved suction nozzle water path, which is vertically arranged at the connecting part of the cigarette cartridge magazine mold part and the curved suction nozzle shell mold part The connecting part of the surface suction mouth shell mold part is connected with the downstream of the water flow in the cigarette cartridge magazine water channel; the straight water channel is located in the curved suction mouth shell mold part close to one side of the cigarette cartridge magazine mold part, and is connected between the curved suction mouth water inlet water channel and the curved suction mouth water outlet water channel; the elliptical water channel 1 is located in the curved suction mouth shell mold part, and is located on the side of the straight water channel away from the cigarette cartridge magazine mold part, both ends of the elliptical water channel 1 are connected with the straight water channel, and the angle between the water flow direction of the water outlet end of the elliptical water channel 1 and the water flow direction of the straight water channel is an obtuse angle, and the angle between the water flow direction of the water inlet end of the elliptical water channel 1 and the water flow direction of the straight water channel is an acute angle.

[0006] Furthermore, the curved suction nozzle water channel also includes an elliptical water channel 2, and the elliptical water channel 2 and the elliptical water channel 1 are located on the same side of the straight water channel. Both ends of the elliptical water channel 2 are connected to the straight water channel, and the water flow direction of the water inlet end of the elliptical water channel 2 forms an acute angle with the water flow direction of the straight water channel, and is connected to the water outlet end of the elliptical water channel 1, and the angle between the water flow direction of the water outlet end of the elliptical water channel 2 and the water flow direction of the straight water channel is an obtuse angle.

[0007] Furthermore, the diameter of the straight waterway is larger than the diameters of the elliptical waterway 1 and the elliptical waterway 2, and the diameter of the elliptical waterway 1 is equal to the diameter of the elliptical waterway 2.

[0008] Furthermore, the water inlet end of the elliptical water channel 1 communicating with the straight water channel and the water inlet end of the elliptical water channel 2 communicating with the straight water channel are both formed with narrow throats.

[0009] Furthermore, the long axes of the elliptical water channel 1 and the elliptical water channel 2 are inclined toward the water outlet end of the straight water channel.

[0010] Furthermore, the straight water channel is inclined, and one end of the straight water channel connected to the water inlet channel of the curved suction nozzle is higher than one end of the straight water channel connected to the water outlet channel of the curved suction nozzle.

[0011] Furthermore, there are two water channels for the cigarette cartridge compartment, which are respectively close to the two side walls of the cigarette cartridge compartment mold part, and the water channels for the cigarette cartridge compartment are in an S-shaped route.

[0012] Furthermore, one end of the cigarette cartridge magazine water channel on one side is the water inlet end, and the other end is connected to the curved suction nozzle water inlet water channel in the curved suction nozzle water channel, and one end of the cigarette cartridge magazine water channel on the other side is the water outlet end, and the other end is connected to the curved suction nozzle water outlet water channel in the curved suction nozzle water channel.

[0013] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0014] 1: Since the straight water channel is inclined, the inclined straight water channel helps the cooling water to form a flushing effect in the mold part of the curved nozzle shell, reducing the possibility of blockage in the curved nozzle water channel.

[0015] 2. Because the water flow direction at the outlet of elliptical water channel 1 forms an obtuse angle with the flow direction of the straight water channel, the cooling water flowing from elliptical water channel 1 collides with the cooling water in the straight water channel when entering the straight water channel. This collision generates vortices, which restrict the flow velocity in some parts of the straight water channel and the flow velocity at the outlet of elliptical water channel 1. This prolongs the residence time of the cooling water in the straight water channel and elliptical water channel 1, improving heat exchange in the mold of the curved nozzle shell.

[0016] 3: Since the vortex formed at the outlet end of the elliptical water channel one is downstream of the narrow throat between the elliptical water channel two and the straight water channel, the increase in flow velocity caused by the narrow throat will impact the vortex formed at the outlet end of the elliptical water channel one, weakening the vortex's ability to cause blockage. Therefore, the narrow throat between the elliptical water channel two and the straight water channel can also prevent the small water channel from being blocked by the formation of vortex, and also help the cooling water in the straight water channel to enter the elliptical water channel two. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of a multi-cavity injection mold in an embodiment of the present application;

[0018] Figure 2 This is a schematic structural diagram of the insert in the embodiment of the present application;

[0019] Figure 3 This is a schematic structural diagram of a cigarette holder model in an embodiment of the present application;

[0020] Figure 4 for Figure 3 The cross-sectional diagram of the middle structure mainly illustrates the structure of the curved nozzle water channel inside the mold of the curved nozzle shell;

[0021] Figure 5 for Figure 3 A cross-sectional diagram of the middle structure, showing the connection between the curved nozzle water channel and the cartridge compartment water channel on one side;

[0022] Figure 6 for Figure 3 A cross-sectional diagram of the middle structure, mainly illustrating the connection between the curved nozzle water channel and the cartridge compartment water channel on the other side;

[0023] In the figure: 100, fixed mold; 200, movable mold; 300, mold core; 400, insert; 4, cigarette holder mold body; 5, mold base; 401, cigarette cartridge compartment mold part; 402, curved suction nozzle shell mold part; 41, cigarette cartridge compartment water channel; 42, curved suction nozzle water channel; 421, curved suction nozzle water inlet water channel; 422, curved suction nozzle water outlet water channel; 423, straight water channel; 424, elliptical water channel 1; 425, elliptical water channel 2; 426, narrow throat. DETAILED DESCRIPTION

[0024] The embodiment of the present application discloses a multi-cavity injection mold, which provides a cigarette cartridge water channel 41 and a curved suction nozzle water channel 42 in the cigarette holder mold body 4 of the mold insert 400, so that the flow rate in the curved suction nozzle water channel 42 changes, which has a flushing effect on the water channel, and a vortex is formed at the connection between the elliptical water channel 1 424 and the elliptical water channel 2 425 in the curved suction nozzle water channel 42, which prolongs the residence time of the cooling water in the elliptical water channel 1 424, and helps the heat exchange of the curved suction nozzle shell mold part 402, solves the technical problems in the prior art of simultaneous multi-cavity injection molding and space limitations of the water channel design of the insert 400, resulting in reduced cooling efficiency, and achieves the goal of slowing down the flow rate of the cooling water in the narrow water channel. Under the condition of the same amount of cooling water, the heat exchange time is extended, resource waste is reduced, and the cooling efficiency of the insert 400 is improved.

[0025] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0026] Reference Figure 1 and Figure 2A multi-cavity injection mold includes a fixed mold 100, a movable mold 200, a mold core 300, and an insert 400. The mold core 300 is located between the fixed mold 100 and the movable mold 200, and the insert 400 is fixedly installed in the mold core 300. The insert 400 includes multiple cigarette holder molds 4 and a mold base 5. The cigarette holder molds 4 can be formed by 3D printing. The cigarette holder molds 4 are printed on the mold base 5 by 3D printing. Multiple cigarette holder molds 4 can be printed on the mold base 5 at the same time to form a multi-cavity injection mold. In a specific implementation, the molds of other parts of the electronic cigarette shell can also be printed on the mold base 5. In the embodiment of the present application, the curved surface part of the cigarette holder of the electronic cigarette is relatively small, which is a representative problem for the design of the water channel in the cigarette holder mold 4. The length of the water channel is easily limited in a limited space.

[0027] Reference Figure 3 、 Figure 4 as well as Figure 5 The mouthpiece mold body 4 includes a cigarette cartridge magazine mold part 401 and a curved suction nozzle shell mold part 402. The two side surfaces of the curved suction nozzle shell mold part 402 are curved, and the two side surfaces of the cigarette cartridge magazine mold part 401 are vertical surfaces. The thickness of the curved suction nozzle shell mold part 402 is thinner than that of the cigarette cartridge magazine mold part 401. Among them, the shell molded by the cigarette cartridge magazine mold part 401 is used to place the cigarette cartridge of the electronic cigarette, and the shell molded by the curved suction nozzle shell mold part 402 is for the mouth of the person using the electronic cigarette to inhale. A cigarette cartridge water channel 41 is formed in the cigarette cartridge mold part 401, and a curved suction nozzle water channel 42 is formed in the curved suction nozzle shell mold part 402, wherein the curved suction nozzle water channel 42 is provided with one and is located in the middle position of the curved suction nozzle shell mold part 402, and the cigarette cartridge water channel 41 is provided with two, which are close to the two side walls of the cigarette cartridge mold part 401 respectively. The cigarette cartridge water channel 41 is in an S-shaped route, and the S-shaped route of the cigarette cartridge water channel 41 covers the entire side wall of the cigarette cartridge mold part 401. One end of the cartridge chamber water channel 41 on one side of the mold part 401 is connected to the cooling water source of the mold, which is used for the entry of cooling water for the cigarette holder mold body 4, and the other end is close to the curved suction nozzle shell mold part 402 and connected to the water inlet end of the curved suction nozzle water channel 42. One end of the cartridge chamber water channel 41 on the other side of the cartridge chamber mold part 401 is close to the curved suction nozzle shell mold part 402 and connected to the water outlet end of the curved suction nozzle water channel 42, and the other end is connected to the water outlet water channel of the mold, which is used to drain the cooling water in the cigarette holder mold body 4.

[0028] Reference Figure 4 、 Figure 5 as well as Figure 6The curved nozzle water channel 42 includes a curved nozzle water inlet channel 421, a curved nozzle water outlet channel 422, a straight water channel 423, an elliptical water channel 1 424, an elliptical water channel 2 425, and a narrow throat 426. The curved nozzle water inlet channel 421 is located at the connection portion between the cartridge compartment mold portion 401 and the curved nozzle shell mold portion 402, and is vertically arranged. The bottom end of the curved nozzle water inlet channel 421 is connected to the end of the cartridge compartment water channel 41 located upstream of the cartridge compartment mold portion 401, which is away from the water inlet end (refer to Figure 5 As shown); the curved nozzle water outlet water channel 422 is also located at the connection part of the cigarette cartridge magazine mold part 401 and the curved nozzle shell mold part 402, and the curved nozzle water outlet water channel 422 is vertically arranged. The curved nozzle water outlet water channel 422 and the curved nozzle water inlet water channel 421 are respectively located on both sides of the curved nozzle shell mold part 402 in the width direction, and the curved nozzle water outlet water channel 422 is connected to the end of the cigarette cartridge magazine water channel 41 in the downstream of the cigarette cartridge magazine mold part 401 away from the water outlet end (refer to Figure 6 As shown in FIG. 1 , the linear water channel 423 is located within the curved nozzle shell mold portion 402, near one side of the cartridge chamber mold portion 401. The linear water channel 423 connects the curved nozzle water inlet channel 421 and the curved nozzle water outlet channel 422. The linear water channel 423 is inclined, with the end of the linear water channel 423 connected to the curved nozzle water inlet channel 421 being higher than the end of the linear water channel 423 connected to the curved nozzle water outlet channel 422. The inclined linear water channel 423 facilitates flushing of the cooling water within the curved nozzle shell mold portion 402, reducing the possibility of blockage within the curved nozzle water channel 42. Furthermore, the diameters of the linear water channel 423, the curved nozzle water outlet channel 422, and the curved nozzle water inlet channel 421 are all consistent.

[0029] Continue to refer to Figure 4The elliptical water channel 1 424 and the elliptical water channel 2 425 are both located in the curved nozzle shell mold portion 402, and are both located on the side of the straight water channel 423 away from the cigarette cartridge chamber mold portion 401. The diameter of the straight water channel 423 is larger than the diameters of the elliptical water channel 1 424 and the elliptical water channel 2 425. Both ends of the elliptical water channel 424 are connected to the straight water channel 423, and the long axis of the elliptical water channel 424 is inclined toward the water outlet end of the straight water channel 423. The water flow direction of the water inlet end of the elliptical water channel 424 and the water flow direction of the straight water channel 423 form an acute angle. The acute angle helps the cooling water in the straight water channel 423 to enter the elliptical water channel 424. The water flow direction of the water outlet end of the elliptical water channel 424 and the water flow direction of the straight water channel 423 form an obtuse angle. The obtuse angle can make the cooling water flowing out of the elliptical water channel 424 collide with the cooling water in the straight water channel 423 when entering the straight water channel 423, and the water flow collision will generate vortex, thereby It will limit the flow rate at some positions of the straight water channel 423 and the flow rate at the water outlet end of the elliptical water channel 1 424, thereby prolonging the residence time of the cooling water in the straight water channel 423 and the elliptical water channel 1 424, which is helpful for the heat exchange of the curved suction nozzle shell mold part 402. In addition, the water inlet end of the elliptical water channel 1 424 connected to the straight water channel 423 is formed with a narrow throat 426. Therefore, the higher pressure of the cooling water fluid in the narrow throat 426 becomes lower after entering the elliptical water channel 1 424, which will make the cooling water flow faster when entering the elliptical water channel 1 424, and also play a flushing role in the elliptical water channel 1 424, reducing the possibility of cooling water being blocked in the elliptical water channel 1 424.Both ends of the elliptical water channel 425 are connected to the straight water channel 423, and the long axis of the elliptical water channel 425 is also inclined toward the water outlet end of the straight water channel 423. The water flow direction at the water inlet end of the elliptical water channel 425 and the water flow direction of the straight water channel 423 form an acute angle. The acute angle helps the cooling water in the straight water channel 423 to enter the elliptical water channel 425. The water inlet end of the elliptical water channel 425 is connected to the water outlet end of the elliptical water channel 1 424, and the water inlet end of the elliptical water channel 425 connected to the straight water channel 423 is also formed with a narrow throat 426, and the part where the water inlet end of the elliptical water channel 425 is connected to the water outlet end of the elliptical water channel 1 424 is located downstream of the narrow throat 426. Therefore, the vortex formed at the water outlet end of the elliptical water channel 1 424 is located downstream of the narrow throat 426, and the flow velocity caused by the narrow throat 426 will impact the elliptical water channel 425. The vortex formed at the outlet end of the arc water channel 1 424 weakens the clogging ability of the vortex, so the narrow throat 426 can also prevent the small water channel from being blocked by the formation of vortex, and also help the cooling water in the straight water channel 423 to enter the elliptical water channel 2 425. Furthermore, the angle between the water flow direction of the outlet end of the elliptical water channel 2 425 and the water flow direction of the straight water channel 423 is an obtuse angle. The obtuse angle state can make the cooling water flowing out of the elliptical water channel 2 425 collide with the cooling water in the straight water channel 423 when entering the straight water channel 423. The water flow collision will generate vortex, which will limit the flow rate at some positions of the straight water channel 423 and the flow rate at the outlet end of the elliptical water channel 2 425, thereby extending the cooling residence time in the straight water channel 423 and the elliptical water channel 2 425, which is helpful for heat exchange of the curved suction nozzle shell mold part 402.

[0030] This application can explain its functional principles through the following operation methods:

[0031] For multi-cavity injection molds, during the injection molding process, multiple cavities are injected at the same time, and the overall mold temperature is relatively high. However, the insert 400 in this application is an insert for an electronic cigarette mouthpiece. The space of the curved nozzle shell mold part 402 of the mouthpiece mold body 4 is limited, and the water path in the curved nozzle shell mold part 402 is relatively short. The cooling water stays in the curved nozzle shell mold part 402 for a short time, resulting in poor cooling efficiency.

[0032] During the injection molding process of the mold in the present application, the cooling system in the mold will be connected to the cigarette cartridge magazine water channel 41 on one side of the cigarette holder mold body 4, and then the cooling water in the cooling system will enter the cigarette cartridge magazine water channel 41 on one side. After the cooling water undergoes heat exchange on one side of the cigarette cartridge magazine mold part 401, it enters the curved suction nozzle water channel 42 in the curved suction nozzle shell mold part 402. The cooling water flows through the curved suction nozzle water inlet water channel 421 in the curved suction nozzle water channel 42 and enters the straight water channel 423 and the elliptical water channel 1 424. The narrow throat 426 formed at the water inlet end of the elliptical water channel 1 424 connecting with the straight water channel 423 will make the flow rate of the cooling water faster when entering the elliptical water channel 1 424, thereby flushing the elliptical water channel 1 424. The effect is to reduce the possibility of cooling water being blocked in the elliptical water channel 1 424. A vortex will be formed at the connection between the elliptical water channel 1 424 and the elliptical water channel 2 425, which will prolong the residence time of the cooling water in the elliptical water channel 1 424, and help the heat exchange of the curved suction nozzle shell mold part 402. The water inlet end of the elliptical water channel 2 425 connected to the straight water channel 423 is also formed with a narrow throat 426. The flow velocity caused by the narrow throat 426 will increase and impact the vortex formed at the water outlet end of the elliptical water channel 1 424, thereby reducing the ability of the vortex to cause blockage. Therefore, the narrow throat 426 can also prevent the small water channel from being blocked by the formation of vortex, and also help the cooling water in the straight water channel 423 to enter the elliptical water channel 2 425.

[0033] Therefore, the present application solves the technical problems in the prior art that the water channel in the curved nozzle shell mold part 402 is short, the cooling water stays in the curved nozzle shell mold part 402 for a short time, and the cooling efficiency is poor. It achieves the goal of slowing down the flow rate of the cooling water in the narrow water channel, extending the heat exchange time under the same amount of cooling water, reducing resource waste, and improving the cooling efficiency of the insert 400 as a whole.

[0034] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

[0035] The above is only a preferred specific implementation method of the embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and concept of the present application within the technical scope disclosed in the present application, and they should be covered by the scope of protection of the present application.

Claims

1. A multi-cavity injection mold, comprising a fixed mold (100), a movable mold (200), a mold core (300) and an insert (400), wherein the insert (400) is mounted on the mold core (300), and is characterized in that: The insert (400) comprises a plurality of cigarette holder mold bodies (4) and a mold base (5) for supporting the plurality of cigarette holder mold bodies (4); the cigarette holder mold body (4) comprises a cigarette cartridge chamber mold part (401) and a curved suction nozzle shell mold part (402); a cigarette cartridge chamber water channel (41) is formed in the cigarette cartridge chamber mold part (401), and a curved suction nozzle water channel (42) is formed in the curved suction nozzle shell mold part (402); The curved surface suction nozzle water channel (42) comprises: A curved nozzle water inlet channel (421) is vertically arranged at the connection portion between the cartridge compartment mold portion (401) and the curved nozzle shell mold portion (402), and is connected to the upstream of the water flow in the cartridge compartment water channel (41); A curved nozzle water outlet water channel (422) is vertically arranged at the connection portion between the cartridge compartment plastic mold portion (401) and the curved nozzle shell plastic mold portion (402), and is connected to the downstream of the water flow in the cartridge compartment water channel (41); a straight water channel (423) located on one side of the curved nozzle shell mold portion (402) close to the cigarette cartridge compartment mold portion (401), and connected between the curved nozzle water inlet channel (421) and the curved nozzle water outlet channel (422); The elliptical water channel (424) is located in the curved mouthpiece shell mold portion (402) and is located on the side of the straight water channel (423) away from the cigarette cartridge chamber mold portion (401). Both ends of the elliptical water channel (424) are connected to the straight water channel (423), and the angle between the water flow direction of the water outlet end of the elliptical water channel (424) and the water flow direction of the straight water channel (423) is an obtuse angle, and the angle between the water flow direction of the water inlet end of the elliptical water channel (424) and the water flow direction of the straight water channel (423) is an acute angle. The curved nozzle water channel (42) further includes an elliptical water channel 2 (425), wherein the elliptical water channel 2 (425) and the elliptical water channel 1 (424) are located on the same side of the straight water channel (423), and both ends of the elliptical water channel 2 (425) are connected to the straight water channel (423), and the angle between the water flow direction of the water inlet end of the elliptical water channel 2 (425) and the water flow direction of the straight water channel (423) is an acute angle, and the elliptical water channel 2 (425) is connected to the water outlet end of the elliptical water channel 1 (424), and the angle between the water flow direction of the water outlet end of the elliptical water channel 2 (425) and the water flow direction of the straight water channel (423) is an obtuse angle.

2. A multi-cavity injection mold according to claim 1, characterized in that: The diameter of the straight waterway (423) is larger than the diameters of the elliptical waterway one (424) and the elliptical waterway two (425), and the diameter of the elliptical waterway one (424) is equal to the diameter of the elliptical waterway two (425).

3. A multi-cavity injection mold according to claim 2, characterized in that: The water inlet end of the elliptical water channel 1 (424) communicating with the straight water channel (423) and the water inlet end of the elliptical water channel 2 (425) communicating with the straight water channel (423) are both formed with a narrow throat (426).

4. The multi-cavity injection mold according to claim 1, wherein: The long axes of the elliptical water channel 1 (424) and the elliptical water channel 2 (425) are inclined toward the water outlet end of the straight water channel (423).

5. The multi-cavity injection mold according to claim 4, characterized in that: The straight water channel (423) is inclined, and one end of the straight water channel (423) connected to the curved suction nozzle water inlet channel (421) is higher than one end of the straight water channel (423) connected to the curved suction nozzle water outlet channel (422).

6. The multi-cavity injection mold according to claim 1, characterized in that: Two cartridge chamber water channels (41) are provided, and the two cartridge chamber water channels (41) are respectively close to two side walls of the cartridge chamber plastic mold portion (401), and the cartridge chamber water channels (41) are in an S-shaped route.

7. The multi-cavity injection mold according to claim 1, characterized in that: One end of the cartridge compartment water channel (41) on one side is a water inlet end, and the other end is connected to the curved surface nozzle water inlet water channel (421) in the curved surface nozzle water channel (42), and one end of the cartridge compartment water channel (41) on the other side is a water outlet end, and the other end is connected to the curved surface nozzle water outlet water channel (422) in the curved surface nozzle water channel (42).

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