Injection molding device and fiber-wound engine insulation shell

Abstract

The application provides an injection molding device and a fiber-wound engine adiabatic shell, wherein the injection molding device comprises a first limiting piece, a second limiting piece and an injection molding mold; the second side of the first limiting piece is provided with a first plug-in plate; the first side of the second limiting piece is provided with a second plug-in plate, and the second plug-in plate can be clamped with the outer side wall of the second end of the fiber-wound engine adiabatic shell; the injection molding mold is internally provided with an injection molding flow channel, one end of the injection molding mold is provided with a protruding structure, and the outer wall of the injection molding mold and the inner wall of the fiber-wound engine adiabatic shell form a containing cavity for containing an injection molding medium to form an adiabatic inner liner. The injection molding device is designed through coaxial positioning, convenient clamping assembly, effective injection molding plugging and stable injection molding cavity formation, significantly improves the stability and accuracy of the injection molding process, provides a strong guarantee for forming a high-quality adiabatic inner liner, and greatly simplifies the production process and reduces the labor and equipment costs.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to an injection molding device and a fiber-wound engine insulation shell. Background Art

[0002] The filament-wound engine case insulation layer is a thermally insulating material located between the inner wall of the engine case and the propellant grains. It consists of three components: the front and rear head insulation layers, and the barrel insulation layer. Existing technical solutions involve first applying rubber to a core mold, then winding and curing it; or preforming rubber sections, assembling them together, then winding and curing them.

[0003] The defects of the existing technology are as follows: 1. Since the current technical solution requires molding the rubber part on the mold first, and then winding it after the rubber part is molded. When molding the rubber part, the rubber at the front and rear sections usually needs to be pre-molded, and at least two sets of molds are required in this process. 2. After molding the rubber at the front and rear sections, the rubber needs to be installed on the winding mold, and then the rubber at the middle section. During installation, if it is a large-scale winding, it is often difficult to fit due to the problem of mold installation accuracy, resulting in problems with the mold surface and then scrapping. 3. After the front and rear head positions are installed, the middle section of the rubber needs to be additionally paved, and each layer of rubber needs to be bonded with adhesive glue during the additional paving; after the glue bonding is completed, the rubber overlap position needs to be polished, and occasionally repaired after polishing. In summary, the molding of the rubber part requires the most manpower and the most molds in the entire winding molding process. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide an injection molding device and a fiber-wound engine insulation housing to eliminate or improve one or more defects in the prior art.

[0005] The present invention provides an injection molding device, comprising a first limiting member, a second limiting member and an injection mold;

[0006] The first limiting member is a barrel-shaped structure, a first side of the first limiting member is a planar structure, and a second side of the first limiting member has a first plug-in plate, the first plug-in plate being capable of being engaged with an outer side wall of a first end of a heat-insulating shell of a filament-wound engine. When the first limiting member is engaged with the heat-insulating shell of the filament-wound engine, the first limiting member is coaxial with the heat-insulating shell of the filament-wound engine.

[0007] The second limiting piece is a barrel type structure, the first side of the second limiting piece has a second plug-in plate, the second side of the second limiting piece is a plane structure, the second plug-in plate can be clamped with the second end outer wall of the fiber winding engine heat insulation shell, and the second limiting piece is coaxial with the fiber winding engine heat insulation shell in the state that the second limiting piece is clamped with the fiber winding engine heat insulation shell.

[0008] The injection mold has an injection flow channel inside, one end of the injection mold has a protruding structure, the protruding structure is used for plugging the through hole of the first end of the fiber winding engine heat insulation shell, and in the state that the injection mold is inserted into the inside of the fiber winding engine heat insulation shell, the outer wall of the injection mold and the inner wall of the fiber winding engine heat insulation shell form a containing cavity for containing an injection medium to form a heat insulation inner liner.

[0009] In one embodiment, the injection flow channel includes a main flow channel and a branch flow channel; one end of the main flow channel is in communication with the end of the injection mold away from the protruding structure, and the other end of the main flow channel extends to the inside of the injection mold close to the protruding structure.

[0010] One end of the branch flow channel is in communication with the main flow channel, and the other end of the branch flow channel is in communication with the side wall of the injection mold.

[0011] In one embodiment, the main flow channel is arranged at the axial position of the injection mold, and the branch flow channel is arranged in multiple groups, and each group of the branch flow channel is arranged along the extension direction of the main flow channel.

[0012] In one embodiment, each group of the branch flow channel includes a plurality of branch sub-flow channels, each branch sub-flow channel is arranged circumferentially along the main flow channel, and the branch sub-flow channel is arranged perpendicularly to the main flow channel.

[0013] In one embodiment, the number of groups of the branch flow channel is 3-5 groups; each group of the branch flow channel includes 2-6 branch sub-flow channels.

[0014] In one embodiment, the first side of the first limiting piece has a threaded hole.

[0015] In one embodiment, the second side of the second limiting piece has an annular groove.

[0016] The application also provides a fiber winding engine heat insulation shell made by the injection molding device, the fiber winding engine heat insulation shell includes an outer shell and a heat insulation inner liner.

[0017] The first end outer side wall of the outer shell has a first plug-in slot which is matched with the first plug-in plate; the second end outer side wall of the outer shell has a second plug-in slot which is matched with the second plug-in plate; the first end of the outer shell has a through hole which is matched with the protruding structure.

[0018] The thermal insulation lining is arranged on the inner side wall of the outer shell and is formed by an injection molding medium between the outer shell and the injection mold.

[0019] In one of the embodiments, the thermal insulation lining is a rubber lining.

[0020] In one of the embodiments, the outer shell is wound by a composite material.

[0021] The injection molding device and the fiber-wound engine thermal insulation shell have the following technical effects: the injection molding device provided by the embodiment of the present application has the coaxial positioning, the convenient clamping assembly, the effective injection molding plugging and the stable injection molding cavity formation, which significantly improves the stability and accuracy of the injection molding process, provides a strong guarantee for forming a high-quality thermal insulation lining, and greatly simplifies the production process and reduces the labor and equipment costs.

[0022] Additional advantages, objects, and features of the application will be set forth in part by the description that follows, and will become apparent to those skilled in the art upon examination of the following detailed description and drawings in which

[0023] Those skilled in the art will understand that the objects and advantages of the present application are not limited to the above specifically described, and the above and other objects that can be achieved by the present application will be more clearly understood according to the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings described herein are intended to provide further understanding of the present application, form a part of the specification, and do not constitute a limitation of the present application. The components in the drawings are not drawn to scale, but only to show the principles of the present application. In order to show and describe some parts of the present application, the corresponding parts in the drawings can be enlarged, i.e. become larger than other components in the exemplary device actually manufactured according to the present application.

[0025] Figure 1 The structure schematic diagram of the injection molding device and the fiber-wound engine thermal insulation shell in an embodiment of the present application.

[0026] Figure 2 The structure schematic diagram of the injection molding device and the fiber-wound engine thermal insulation shell in an embodiment of the present application. Figure 1An enlarged view of a portion A.

[0027] Reference numerals: 1, first limiting member; 2, second limiting member; 3, injection mold; 4, first plug-in board; 5, second plug-in board; 6, protruding structure; 7, main flow channel; 8, branch sub-flow channel; 9, threaded hole; 10, annular groove; 11, outer shell; 12, thermal insulation lining. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to embodiments and drawings. Herein, the illustrative embodiments of the present application and their descriptions are used to explain the present application, but are not intended to limit the present application.

[0029] Here, it should also be noted that, in order to avoid the present application being obscured by unnecessary details, only structures and / or processing steps closely related to the solutions according to the present application are shown in the drawings, and other details not closely related to the present application are omitted.

[0030] It should be emphasized that the term "comprises / comprising" as used herein indicates the presence of the stated features, elements, steps or components, but does not exclude one or more other features, elements, steps or components.

[0031] Here, it should also be noted that, if not specifically stated, the term "connected" as used herein can not only mean direct connection, but also indirect connection with an intermediate.

[0032] In the following, embodiments of the present application will be described with reference to the accompanying drawings. In the drawings, the same reference numerals represent the same or similar parts, or the same or similar steps.

[0033] Reference Figure 1 and Figure 2An embodiment of the present invention provides an injection molding device, including a first limiting member 1, a second limiting member 2 and an injection mold 3; the first limiting member 1 is a barrel-shaped structure, the first side of the first limiting member 1 is a planar structure, the second side of the first limiting member 1 has a first plug-in board 4, the first plug-in board 4 can be engaged with the first end outer side wall of the fiber-wound engine insulation shell, and when the first limiting member 1 is engaged with the fiber-wound engine insulation shell, the first limiting member 1 is coaxial with the fiber-wound engine insulation shell; the second limiting member 2 is a barrel-shaped structure, the first side of the second limiting member 2 has a second plug-in board 5, and the second side of the second limiting member 2 is a planar structure. The second plug-in board 5 can be connected to the outer wall of the second end of the fiber-wound engine insulation shell. When the second limit member 2 is connected to the fiber-wound engine insulation shell, the second limit member 2 is coaxial with the fiber-wound engine insulation shell; the injection mold 3 has an injection flow channel inside, and one end of the injection mold 3 has a protruding structure 6. The protruding structure 6 is used to seal the through hole of the first end of the fiber-wound engine insulation shell. When the injection mold 3 is inserted into the interior of the fiber-wound engine insulation shell, the outer wall of the injection mold 3 and the inner wall of the fiber-wound engine insulation shell form a accommodating cavity for accommodating the injection medium to form an insulating lining 12.

[0034] In the above embodiment, the first limiter 1 and the second limiter 2 both adopt a barrel-shaped structure design, and are respectively connected to the outer side walls of the fiber-wound engine insulation shell through the first plug-in plate 4 and the second plug-in plate 5. This design ensures that the first limiter 1 and the second limiter 2 can maintain a coaxial state with the insulation shell when they are connected to the insulation shell, thereby effectively avoiding quality problems that may be caused by misalignment during the injection molding process. The raised structure 6 at one end of the injection mold 3 can tightly seal the first end through-hole of the fiber-wound engine insulation shell to prevent the injection molding medium from leaking during the injection molding process. This design ensures that the injection molding medium can be completely filled in the accommodating cavity formed between the injection mold 3 and the insulation shell, providing a guarantee for the formation of a high-quality insulation lining. When the injection mold 3 is inserted into the insulation shell, its outer wall and the inner wall of the insulation shell are tightly matched to form a stable injection molding cavity. This cavity provides an ideal molding space for the injection molding medium, which helps to obtain an insulation lining 12 with uniform structure and excellent performance.

[0035] Compared with the traditional solution, the injection molding device of this embodiment has the following advantages:

[0036] 1. The traditional rubber laying method requires pre-molding the rubber in the front and rear end sections; this method, however, can mold the rubber inside the shell in one go.

[0037] 2. The traditional rubber laying method requires assembling the front and rear heads, laying the barrel sections, and grinding the barrel sections. However, this method does not require grinding the rubber.

[0038] 3. Traditional scheme of laying rubber, the interface between the composite material and the rubber is bonded by the thermal expansion of the rubber and the tension of the fiber. However, this scheme uses the injection molding machine to provide pressure, and the molding pressure can be adjusted in a large range, which can greatly avoid the problem of interface debonding;

[0039] 4. Traditional scheme of laying rubber, the partial curing of the composite material and the vulcanization of the rubber occur at the same time. If the curing and vulcanization temperatures of the material do not match, it will have a great impact on the performance of the material. However, this scheme separates the curing and vulcanization, and there is no problem of temperature mismatch.

[0040] In some embodiments, the injection flow channel includes a main flow channel 7 and a branch flow channel; one end of the main flow channel 7 is in communication with the end of the injection mold 3 away from the protruding structure 6, and the other end of the main flow channel 7 extends to the inside of the injection mold 3 near the protruding structure 6; one end of the branch flow channel is in communication with the main flow channel 7, and the other end of the branch flow channel is in communication with the side wall of the injection mold 3.

[0041] In the above embodiments, the design of the main flow channel 7 ensures that the injection medium can smoothly enter from the end of the injection mold 3 away from the protruding structure 6 and extend along the main flow channel 7 to the position near the protruding structure 6. At the same time, the setting of the branch flow channel enables the injection medium to be distributed uniformly in the injection mold 3. This design helps to form a structure that is uniform and defect-free, improving the overall performance of the product.

[0042] In some embodiments, the main flow channel 7 is arranged at the axial position of the injection mold 3, and the branch flow channel is arranged in multiple groups, and each group of branch flow channels is arranged along the extension direction of the main flow channel 7. Multiple groups of branch flow channels help to quickly and uniformly fill the accommodation cavity with the medium, and help to form an inner liner with uniform quality.

[0043] In some embodiments, each group of branch flow channels includes a plurality of branch sub-flow channels 8, each branch sub-flow channel 8 is arranged circumferentially along the main flow channel 7, and the branch sub-flow channel 8 is arranged perpendicularly to the main flow channel 7. Such an arrangement can improve the uniformity of the inner liner formation process.

[0044] In some embodiments, the number of groups of branch flow channels is 3-5 groups; each group of branch flow channels includes 2-6 branch sub-flow channels 8. The specific number can be reasonably selected according to actual conditions.

[0045] In some embodiments, the first side of the first limiting piece 1 has a threaded hole 9. The threaded hole 9 is used to connect with other injection molding or positioning devices.

[0046] In some embodiments, the second side of the second limiting piece 2 has an annular groove 10. The annular groove 10 is used to connect with other injection molding or positioning devices.

[0047] Reference Figure 1 and Figure 2 An embodiment of the present invention further provides a fiber-wound engine insulation shell, which is made by an injection molding device. The fiber-wound engine insulation shell includes an outer shell 11 and an insulation lining 12; the outer wall of the first end of the outer shell 11 has a first plug-in groove, which is adapted to the first plug-in board 4; the outer wall of the second end of the outer shell 11 has a second plug-in groove, which is adapted to the second plug-in board 5; the first end of the outer shell 11 has a through hole, which is adapted to the protrusion structure 6; the insulation lining 12 is arranged on the inner wall of the outer shell 11, and the insulation lining 12 is formed by the injection molding medium between the outer shell 11 and the injection mold 3.

[0048] In the above embodiment, the outer side walls of the first and second ends of the outer shell 11 are respectively designed with a first plug-in slot and a second plug-in slot that are compatible with the first plug-in board 4 and the second plug-in board 5. This design not only enables the injection molding device to be accurately and stably assembled with the outer shell 11, but also ensures the coaxiality between the injection mold 3 and the outer shell 11 during the injection molding process, thereby improving the molding quality and stability of the thermal insulation lining 12. The thermal insulation lining 12 is formed by the injection molding medium between the outer shell 11 and the injection mold 3 and fits tightly against the inner side wall of the outer shell 11. This design not only improves the bonding strength between the thermal insulation lining 12 and the outer shell 11, but also enables the thermal insulation lining 12 to fully exert its thermal insulation properties, effectively isolating the heat generated by the engine and protecting the safe operation of the engine and surrounding components.

[0049] In some embodiments, the insulating liner 12 is a rubber liner.

[0050] In some embodiments, the outer shell 11 is formed by winding a composite material.

[0051] The method for manufacturing a fiber-wound engine insulation housing by an injection molding device comprises the following steps:

[0052] 1. Wrap the composite shell on the mold, cure and demould;

[0053] 2. Install the injection mold inside the composite shell (positioning structures can be set at the front and back or external tooling can be used for positioning to ensure the required coaxiality and uniform wall thickness).

[0054] 3. Use the injection molding machine to inject the inside, and then wait for the rubber part to be in a stable molding state;

[0055] 4. Remove the mold from the inside of the product. This process can be improved through taper design, inflation design, demoulding tooling design, etc., making demoulding more flexible;

[0056] 5. Proceed with injection molding of the next product.

[0057] The injection molding device and the fiber-wound engine insulation housing in the above embodiment have the following advantages and technical effects:

[0058] 1. This method has high molding accuracy for rubber linings and can be flexibly adjusted during the development stage without having to make new molds, thus saving costs;

[0059] 2. The molds required for the injection molding device and the fiber-wound engine insulation shell molding rubber part are simple and few in number, saving costs;

[0060] 3. The injection molding device and the fiber-wound engine insulation shell molding rubber part require relatively less vacuum auxiliary materials, saving costs;

[0061] 4. Injection molding and fiber-wound engine insulation housings can avoid the problem of weak bonding between rubber and composite materials in traditional methods;

[0062] 5. The service life of the injection molding device and the fiber-wound engine insulation housing mold is relatively long;

[0063] 6. The molding injection molding device and the fiber-wound engine insulation shell can prevent the composite material from exceeding the temperature resistance of rubber during high-temperature curing. Separate curing avoids this problem.

[0064] It should be understood that the present invention is not limited to the specific configurations and processes described above and illustrated in the figures. For the sake of brevity, a detailed description of known methods is omitted. In the above embodiments, several specific steps are described and illustrated as examples. However, the method of the present invention is not limited to the specific steps described and illustrated. Those skilled in the art may make various changes, modifications, and additions, or change the order of the steps after understanding the spirit of the present invention.

[0065] In the present invention, features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, and / or combined with or replace features of other embodiments.

[0066] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations to the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An injection molding device, characterized in that: It comprises a first limiting member (1), a second limiting member (2) and an injection mold (3); The first limiting member (1) is a barrel-shaped structure, the first side of the first limiting member (1) is a plane structure, the second side of the first limiting member (1) has a first plug-in board (4), the first plug-in board (4) can be engaged with the first end outer side wall of the fiber-wound engine thermal insulation shell, and when the first limiting member (1) is engaged with the fiber-wound engine thermal insulation shell, the first limiting member (1) is coaxial with the fiber-wound engine thermal insulation shell; The second limiting member (2) is a barrel-shaped structure, the first side of the second limiting member (2) is provided with a second plug-in plate (5), the second side of the second limiting member (2) is a planar structure, the second plug-in plate (5) can be engaged with the second end outer side wall of the fiber-wound engine insulation shell, and when the second limiting member (2) is engaged with the fiber-wound engine insulation shell, the second limiting member (2) is coaxial with the fiber-wound engine insulation shell; The injection mold (3) has an injection flow channel inside, and one end of the injection mold (3) has a protruding structure (6), and the protruding structure (6) is used to seal the through hole at the first end of the fiber-wound engine insulation shell. When the injection mold (3) is inserted into the fiber-wound engine insulation shell, the outer wall of the injection mold (3) and the inner wall of the fiber-wound engine insulation shell form a accommodating cavity for accommodating an injection medium to form an insulation lining (12).

2. The injection molding device according to claim 1, characterized in that The injection molding flow channel comprises a main flow channel (7) and a branch flow channel; one end of the main flow channel (7) is connected to the end of the injection mold (3) away from the protruding structure (6), and the other end of the main flow channel (7) extends to a portion inside the injection mold (3) close to the protruding structure (6); One end of the branch flow channel is in communication with the main flow channel (7), and the other end of the branch flow channel is in communication with the side wall of the injection mold (3).

3. The injection molding device according to claim 2, characterized in that The main flow channel (7) is arranged at the axial position of the injection mold (3), and the branch flow channels are provided in multiple groups, and each group of branch flow channels is arranged along the extension direction of the main flow channel (7).

4. The injection molding device according to claim 3, characterized in that Each group of branch flow channels comprises a plurality of branch sub-flow channels (8), each of the branch sub-flow channels (8) is arranged along the circumference of the main flow channel (7), and the branch sub-flow channels (8) are arranged perpendicular to the main flow channel (7).

5. The injection molding device according to claim 4, characterized in that The number of groups of the branch flow channels is 3-5; each group of the branch flow channels includes 2-6 branch sub-flow channels (8).

6. The injection molding device according to claim 1, characterized in that The first side of the first limiting member (1) has a threaded hole (9).

7. The injection molding device according to claim 1, characterized in that The second side of the second limiting member (2) has an annular groove (10).

8. A fiber-wound engine insulation housing, made by the injection molding device according to any one of claims 1 to 7, characterized in that: The fiber-wound engine thermal insulation casing comprises an outer casing (11) and a thermal insulation lining (12); The outer wall of the first end of the outer shell (11) has a first plug-in slot, and the first plug-in slot is adapted to the first plug-in board (4); the outer wall of the second end of the outer shell (11) has a second plug-in slot, and the second plug-in slot is adapted to the second plug-in board (5); the first end of the outer shell (11) has a through hole, and the through hole is adapted to the protruding structure (6); The thermal insulation lining (12) is arranged on the inner side wall of the outer shell (11), and the thermal insulation lining (12) is formed by the injection medium between the outer shell (11) and the injection mold (3).

9. The fiber-wound engine insulation casing according to claim 8, characterized in that: The thermal insulation lining (12) is a rubber lining.

10. The filament wound engine insulation casing according to claim 8, characterized in that: The outer shell (11) is formed by winding a composite material.

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