Injection molding device and fiber winding engine heat insulation shell

Abstract

The invention provides an injection molding device and a fiber-wound engine heat insulation shell. The injection molding device comprises a first limiting part, a second limiting part and an injection mold. The second side of the first limiting piece is provided with a first inserting plate. A second inserting plate is arranged on the first side of the second limiting piece, and the second inserting plate can be clamped with the outer side wall of the second end of the fiber winding engine heat insulation shell; an injection molding runner is formed in the injection mold, one end of the injection mold is provided with a protruding structure, and the outer wall of the injection mold and the inner wall of the fiber-wound engine heat insulation shell form a containing cavity used for containing an injection molding medium to form a heat insulation lining. According to the injection molding device, through the design of coaxial positioning, convenient clamping assembly, effective injection molding plugging, stable injection molding cavity forming and the like, the stability and accuracy of the injection molding process are remarkably improved, a powerful guarantee is provided for forming a high-quality heat insulation lining, meanwhile, the production process is greatly simplified, and the labor and equipment cost is reduced.

Description

Technical Field

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

[0002] The fiber-wound engine casing insulation layer is a kind of insulation material located between the inner wall of the engine casing and the propellant grain. The insulation layer consists of three parts: the front and rear head insulation layers and the casing barrel insulation layer. The existing technical solution is to first lay rubber on the core mold, then wind and cure it; or to preform some rubber, combine them together by assembly, and then wind and cure them.

[0003] The defects of the prior art are as follows: 1. The current technical solution requires that the rubber part be molded on the mold first, and then the winding is performed 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 the rubber at the front and rear sections are molded, 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 repairs are required 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, an embodiment of the present invention provides an injection molding device and a fiber-wound engine insulation casing to eliminate or improve one or more defects existing 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 stopper is a barrel-shaped structure, the first side of the first stopper is a plane structure, the second side of the first stopper has a first plug-in board, the first plug-in board can be engaged with the first end outer side wall of the fiber-wound engine insulation shell, and when the first stopper is engaged with the fiber-wound engine insulation shell, the first stopper is coaxial with the fiber-wound engine insulation shell;

[0007] The second stopper is a barrel-shaped structure, a first side of the second stopper has a second plug-in plate, a second side of the second stopper is a plane structure, the second plug-in plate can be snap-fitted with the second end outer side wall of the fiber-wound engine insulation shell, and when the second stopper is snap-fitted with the fiber-wound engine insulation shell, the second stopper is coaxial with the fiber-wound engine insulation shell;

[0008] The injection mold has an injection runner inside, and one end of the injection mold has a protrusion structure, which is used to seal the through hole at the first end of the fiber-wound engine insulation shell. When the injection mold is inserted into the fiber-wound engine insulation shell, the outer wall of the injection mold and the inner wall of the fiber-wound engine insulation shell form a accommodating cavity for accommodating injection medium to form an insulating lining.

[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 connected to 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 near the protruding structure;

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

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

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

[0013] In one embodiment, 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.

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

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

[0016] The present invention also provides a fiber-wound engine heat-insulating casing, which is made by the injection molding device, and the fiber-wound engine heat-insulating casing comprises an outer casing and a heat-insulating liner;

[0017] The outer wall of the first end of the outer shell has a first plugging slot, and the first plugging slot is adapted to the first plugging board; the outer wall of the second end of the outer shell has a second plugging slot, and the second plugging slot is adapted to the second plugging board; the first end of the outer shell has a through hole, and the through hole is adapted to the protruding structure;

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

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

[0020] In one embodiment, the outer shell is formed by winding a composite material.

[0021] The injection molding device and the fiber-wound engine insulation shell in the embodiment of the present invention have the following technical effects: the injection molding device provided in the embodiment of the present invention significantly improves the stability and accuracy of the injection molding process through designs such as coaxial positioning, convenient snap-on assembly, effective injection molding sealing, and stable injection molding cavity formation, thereby providing a strong guarantee for the formation of high-quality insulation linings, while greatly simplifying the production process and reducing labor and equipment costs.

[0022] Additional advantages, purposes, and features of the present invention will be described in part in the following description, and will become apparent to those skilled in the art after studying the following, or may be learned from the practice of the present invention. The purposes and other advantages of the present invention may be achieved and obtained by the structures specifically indicated in the specification and the accompanying drawings.

[0023] Those skilled in the art will appreciate that the objectives and advantages that can be achieved with the present invention are not limited to the above specific description, and the above and other objectives that can be achieved by the present invention will be more clearly understood from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of this application, and do not constitute a limitation of the present invention. The components in the drawings are not drawn to scale, but are only for the purpose of illustrating the principles of the present invention. In order to facilitate the illustration and description of some parts of the present invention, the corresponding parts in the drawings may be enlarged, that is, they may become larger relative to other components in the exemplary device actually manufactured according to the present invention.

[0025] Figure 1 It is a schematic structural diagram of an injection molding device and a fiber-wound engine insulation casing in one embodiment of the present invention.

[0026] Figure 2 For the present invention Figure 1A partial enlarged view of point A in the middle.

[0027] Figure numerals: 1. first limit member; 2. second limit 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 purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0029] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the solutions according to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0030] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, elements, steps or components, but does not exclude the presence or addition of one or more other features, elements, steps or components.

[0031] It should also be noted that, unless otherwise specified, the term “connection” herein may refer not only to a direct connection but also to an indirect connection with an intermediate.

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

[0033] Reference Figure 1 and Figure 2The embodiment of the present invention provides an injection molding device, including a first limiter 1, a second limiter 2 and an injection mold 3; the first limiter 1 is a barrel-shaped structure, the first side of the first limiter 1 is a plane structure, the second side of the first limiter 1 has a first plug-in board 4, the first plug-in board 4 can be clamped with the first end outer side wall of the fiber-wound engine insulation shell, and when the first limiter 1 is clamped with the fiber-wound engine insulation shell, the first limiter 1 is coaxial with the fiber-wound engine insulation shell; the second limiter 2 is a barrel-shaped structure, the first side of the second limiter 2 has a second plug-in board 5, and the second side of the second limiter 2 is a plane structure, The second plug-in board 5 can be engaged with the outer wall of the second end of the fiber-wound engine insulation shell. When the second limit member 2 is engaged with 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 protrusion structure 6. The protrusion 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 the injection medium to form an insulating lining 12.

[0034] In the above embodiment, the first limiter 1 and the second limiter 2 are both designed with a barrel-shaped structure, and are respectively connected to the outer side walls of the two ends of the fiber-wound engine insulation shell through the first plug-in board 4 and the second plug-in board 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 medium from leaking during the injection molding process. This design ensures that the injection 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 cavity together. This cavity provides an ideal molding space for the injection medium, which helps to obtain an insulation lining 12 with uniform structure and excellent performance.

[0035] Compared with the traditional solution, the advantages of the injection molding device of this embodiment are as follows:

[0036] 1. The traditional solution for laying rubber requires the rubber in the front and rear end head areas to be molded in advance; while this solution can mold the rubber inside the shell in one go;

[0037] 2. The traditional solution for laying rubber requires laying the barrel section and grinding the barrel section after assembling the front and rear heads. However, this solution does not require grinding of the rubber;

[0038] 3. The traditional solution is to lay rubber, and 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 solution uses an injection molding machine to provide pressure, and the molding pressure can be adjusted in a wide range, which can greatly avoid the problem of interface debonding;

[0039] 4. In the traditional solution, the composite material is partially cured and the rubber is vulcanized at the same time. If the curing and vulcanization temperatures of the material do not match, the material properties will be greatly affected. In this solution, curing and vulcanization occur separately, and there is no problem of temperature mismatch.

[0040] In some embodiments, the injection channel includes 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 the inside of the injection mold 3 close to the protruding structure 6; one end of the branch flow channel is connected to the main flow channel 7, and the other end of the branch flow channel is connected to the side wall of the injection mold 3.

[0041] In the above embodiment, 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 part close to the protruding structure 6. At the same time, the provision of the branch flow channel enables the injection medium to be diverted from the main flow channel 7 to the vicinity of the side wall of the injection mold 3, thereby achieving uniform distribution of the injection medium inside the injection mold 3. This design helps to form a uniformly structured, defect-free thermal insulation lining, and improves 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 multiple groups of branch flow channels are provided, 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 the accommodation medium to quickly and evenly fill the accommodation cavity, and help form a lining 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 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. Such an arrangement can improve the uniformity of the lining forming 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 stopper 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 stopper 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 The embodiment of the present invention also 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, and the first plug-in groove 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, and the second plug-in groove 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 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 first end and the second end outer wall of the outer shell 11 are respectively designed with the first plug-in slot and the second plug-in slot adapted to 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 on the inner 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 give full play to its thermal insulation performance, effectively isolate the heat generated by the engine, and protect 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 material shell on the mold, cure and demould;

[0053] 2. Install the injection mold inside the composite material 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 improve demoulding through taper design, inflation design, demoulding tooling design, etc., and demoulding is more flexible;

[0056] 5. Carry out injection molding of the next product.

[0057] The injection molding device and the fiber-wound engine insulation housing in the above embodiments 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 rubber part of the fiber-wound engine insulation shell are simple and small in number, saving costs;

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

[0061] 4. The injection molding device and the fiber-wound engine insulation shell 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 when being cured at high temperature. Separate curing avoids this problem.

[0064] It should be clear that the present invention is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between 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 features of other embodiments or replace features of other embodiments.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope 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 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) is provided with a second plug-in board (5), the second side of the second limiting member (2) is a plane structure, the second plug-in board (5) can be snap-fitted with the second end outer side wall of the fiber-wound engine insulation shell, and when the second limiting member (2) is snap-fitted 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 containing cavity for containing an injection medium to form an insulation lining (12).

2. The injection molding device according to claim 1, characterized in that: The injection flow channel comprises a main flow channel (7) and a branch flow channel; one end of the main flow channel (7) is connected to an 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 of 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 arranged 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 the 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 casing, made by the injection molding device according to any one of claims 1 to 7, characterized in that: The fiber-wound engine heat-insulating casing comprises an outer casing (11) and a heat-insulating liner (12); The outer wall at the first end of the outer shell (11) has a first plugging slot, which is compatible with the first plugging board (4); the outer wall at the second end of the outer shell (11) has a second plugging slot, which is compatible with the second plugging board (5); the first end of the outer shell (11) has a through hole, which is compatible with 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 fiber-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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