Composite pressure-bearing cylinder connecting structure

Abstract

The utility model discloses a composite pressure-bearing cylinder connecting structure, which relates to the technical field of new materials and comprises a composite cylinder, a metal part is hermetically mounted at the top end of a main body of the composite cylinder, and a pin bolt is fastened and connected between the surface of the metal part and the surface of the main body of the composite cylinder. The composite pressure-bearing cylinder has the beneficial effects that through simulation analysis, the strength, rigidity and sealing performance of the composite pressure-bearing cylinder are greatly improved, the bearing capacity is very considerable, the composite pressure-bearing cylinder is formed by winding in a wet method, bubbles are extruded out by controlling tension, and fiber abrasion and initial defects can be reduced by applying the resin glue solution; the fiber yarn arrangement parallelism is good; the production automation degree is high, the requirement for operators is low, the efficiency is high, the fiber volume content is high, the material utilization rate is high, and the quality consistency is good.

Description

Technical Field

[0001] This utility model relates to the field of new materials technology, and in particular to a composite pressure-bearing cylinder connection structure. Background Technology

[0002] Currently, carbon fiber wound composite materials are used to manufacture pressure-bearing cylinders in diving equipment. By using different orthogonal winding layup methods, the hydrostatic pressure resistance is improved, which not only increases the structural strength but also reduces the structural weight and enhances durability. The development and application of this technology demonstrates the potential and advantages of composite materials in pressure-bearing structures.

[0003] However, relying solely on adhesive bonding to connect the composite cylinder to the metal components may not meet the required sealing performance. Under certain pressure, the composite cylinder and metal components may detach, severely impacting the reliability of the pressure-bearing cylinder. Therefore, further research is needed to address issues such as sealing performance, fatigue life, and initial defects to achieve wider application. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A composite pressure-bearing cylinder connection structure includes a composite cylinder body, a metal component is sealed and installed at the top end of the composite cylinder body, and a pin bolt is fastened between the surface of the metal component and the surface of the composite cylinder body.

[0007] As a preferred embodiment of the composite pressure-bearing cylinder connection structure of this utility model, the composite cylinder body is a cylindrical structure with an insertion groove at its top.

[0008] As a preferred embodiment of the composite pressure-bearing cylinder connection structure of this utility model, the insertion groove is a circular structure, and the metal part is tightly inserted into the insertion groove.

[0009] As a preferred embodiment of the composite pressure-bearing cylinder connection structure of this utility model, the inner surface of the insertion groove is provided with a first mounting hole, which is evenly distributed circumferentially and arranged in two rows, one above the other.

[0010] As a preferred embodiment of the composite pressure-bearing cylinder connection structure of this utility model, the metal part is a cylindrical structure with a flange structure at its top end, and is pressed against the top end of the composite cylinder body.

[0011] As a preferred embodiment of the composite pressure-bearing cylinder connection structure of this utility model, the surface of the metal part is provided with a second mounting hole, which is a sealed fine thread hole structure.

[0012] In a preferred embodiment of the composite pressure-bearing cylinder connection structure of this utility model, the second mounting hole is aligned with the first mounting hole, and the pin bolt passes through the first mounting hole and is threaded into the second mounting hole.

[0013] As a preferred embodiment of the composite pressure-bearing cylinder connection structure of this utility model, wherein: the inner end of the pin bolt is fixed with a sealing cone, and the sealing cone is a conical structure.

[0014] As a preferred embodiment of the composite pressure-bearing cylinder connection structure of this utility model, a sealing ring is sleeved on the surface of the pin bolt. The sealing ring adopts an O-ring rubber ring structure and tightly abuts against the inside of the first mounting hole.

[0015] As a preferred embodiment of the composite pressure-bearing cylinder connection structure of this utility model, the outer end of the pin bolt is provided with a protruding tip and has a screwing groove, which is an internal hexagonal structure.

[0016] The beneficial effects of this utility model are as follows: Through simulation analysis, this structure greatly improves the strength, rigidity, and sealing performance of the composite pressure cylinder, and has a very considerable load-bearing capacity. Moreover, the wet winding molding process allows excess resin to squeeze out air bubbles by controlling the tension, which also reduces fiber wear and initial defects. The fiber yarns have good parallelism. The production process is highly automated, requires fewer operators, is highly efficient, has a high fiber volume content, high material utilization, and good quality consistency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0018] Figure 1 This is an overall structural diagram of the composite pressure-bearing cylinder connection structure.

[0019] Figure 2 This is a cross-sectional view of the insertion part of the composite pressure-bearing cylinder connection structure.

[0020] Figure 3 This is a structural diagram of the insertion groove at the top of the composite cylinder, which is part of the composite pressure-bearing cylinder connection structure.

[0021] Figure 4 This is a structural diagram of the metal components of a composite pressure-bearing cylinder connection structure.

[0022] Figure 5 This is a structural diagram of the pin and bolt portion of the composite pressure-bearing cylinder connection structure.

[0023] The following are the labels in the diagram: 101, composite cylinder; 102, metal part; 103, pin bolt; 104, sealing ring; 105, insertion groove; 106, first mounting hole; 107, second mounting hole; 108, turning groove; 109, sealing cone. Detailed Implementation

[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0025] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0027] Example 1:

[0028] Reference Figures 1-5 This is the first embodiment of the present utility model. This embodiment provides a composite pressure-bearing cylinder connection structure, including a composite cylinder 101. A metal part 102 is sealed and installed at the top of the main body of the composite cylinder 101. A pin bolt 103 is fastened between the surface of the metal part 102 and the surface of the main body of the composite cylinder 101.

[0029] The metal part 102 is used to seal and reinforce the main body of the composite cylinder 101; the pin bolt 103 is used to fasten and connect the metal part 102 to the main body of the composite cylinder 101.

[0030] Example 2:

[0031] Reference Figures 1-5 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0032] Specifically, the main body of the composite cylinder 101 is a cylindrical structure with a slot 105 at its top.

[0033] By setting the insertion slot 105 for installing the metal part 102, an efficient and reliable connection between the composite cylinder 101 and the metal part 102 is achieved.

[0034] Specifically, the insertion slot 105 has a circular structure, and the metal part 102 is tightly inserted into the insertion slot 105.

[0035] The metal part 102 is connected to the main body of the composite cylinder 101 by inserting a groove 105. The groove 105 is a circular structure, and its inner diameter, depth and tolerance must match the insertion end of the metal part 102 to ensure installation accuracy and tightness. The groove 105 transmits axial tensile and compressive forces, torque and lateral shear force through the contact surface between the groove wall and the metal part 102. The groove wall adopts a rounded transition design to avoid stress concentration and ensure that the load is evenly transmitted to the composite cylinder 101.

[0036] Specifically, the inner surface of the insertion slot 105 has a first mounting hole 106, which is evenly distributed around the circumference and arranged in two rows, one above the other.

[0037] By setting the first mounting hole 106 for mounting the pin bolt 103, the first mounting hole 106 serves as a key connection structure between the insertion groove 105 and the metal part 102. The first mounting hole 106 is evenly distributed along the circumference of the inner surface of the insertion groove 105, ensuring that the pin bolt 103 is subjected to uniform force and avoiding local stress concentration. The double-row staggered arrangement forms a spatial three-dimensional constraint, which significantly improves the torsional stiffness, not only improving the structural performance but also significantly enhancing the engineering applicability of the composite structure.

[0038] Specifically, the metal part 102 has a cylindrical structure with a flange at the top, which is pressed against the top of the composite cylinder body 101.

[0039] The metal part 102 is inserted into the top of the composite cylinder 101 for reinforcement. As a key reinforcing component of the composite cylinder 101, the cylindrical structure and flange design of the metal part 102 effectively reinforce the composite cylinder 101. The main body of the metal part 102 is cylindrical, and its outer diameter matches the inner diameter of the composite cylinder 101. After the metal part 102 is inserted into the top of the composite cylinder 101, its cylindrical structure significantly improves the local bending stiffness.

[0040] Specifically, the surface of the metal part 102 has a second mounting hole 107, which is a sealed fine thread hole structure.

[0041] By providing a second mounting hole 107 for mounting the pin bolt 103, the second mounting hole 107 adopts a fine thread, which has a smaller pitch than a coarse thread, enabling more precise axial positioning and higher connection rigidity, ensuring the fit with the pin bolt 103, avoiding loosening under dynamic loads, not only improving structural performance, but also significantly enhancing the engineering applicability of the metal part 102.

[0042] Specifically, the second mounting hole 107 is aligned with the first mounting hole 106, and the pin bolt 103 passes through the first mounting hole 106 and is threaded into the second mounting hole 107.

[0043] The pin bolt 103 is fastened to the metal part 102 and the composite cylinder 101 body through the first mounting hole 106 and the second mounting hole 107. The first mounting hole 106 and the second mounting hole 107 adopt a "circumferentially distributed + double-row staggered" layout to ensure that the pin bolt 103 is not eccentrically stressed after insertion. The second mounting hole 107 adopts fine thread to achieve precise engagement. An O-ring sealing groove is set at the bottom of the second mounting hole 107, which is used in conjunction with a fluororubber O-ring. The threaded part is coated with thread sealant to form a double seal. A spring washer is set between the bolt head and the composite cylinder 101 to provide anti-loosening compensation.

[0044] Example 3:

[0045] Reference Figures 1-5 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0046] Specifically, a sealing cone 109 is fixed to the inner end of the pin bolt 103, and the sealing cone 109 has a conical structure.

[0047] By setting a sealing cone 109, the pin bolt 103 is stabilized. As a key auxiliary structure of the pin bolt 103, the sealing cone 109's conical design achieves enhanced stability and sealing protection for the bolt connection.

[0048] Specifically, a sealing ring 104 is fitted onto the surface of the pin bolt 103. The sealing ring 104 adopts an O-ring structure and fits tightly against the inside of the first mounting hole 106.

[0049] By setting a sealing ring 104, the connection between the metal part 102 and the main body of the composite cylinder 101 is strengthened and sealed.

[0050] Specifically, the outer end of the pin bolt 103 has a protruding tip and a screwing groove 108, which is an internal hexagonal structure.

[0051] The screwing groove 108 is provided for screwing the mounting pin bolt 103.

[0052] In use, the carbon fiber yarn bundle is impregnated with resin and wound onto the mold mandrel. The inner wall of the composite cylinder 101 is first wound and cured before machining. The metal part 102 is then fitted onto the composite cylinder 101. Before fitting, acetone is used to clean the mating surfaces of the composite cylinder 101 and the metal part 102. Adhesive is applied to the mating area, and sealant is applied to the R-corner area.

[0053] After the metal part 102 is fitted onto the main body of the composite cylinder 101, the machined pin bolt 103 is installed in the first mounting hole 106 and the second mounting hole 107. Using an Allen wrench, the pin bolt 103 is screwed into the metal part 102 from the inner wall of the composite cylinder 101. Before screwing in, the pin bolt 103 needs to be fitted with an FPM O-ring rubber seal 104, and PTFE tape needs to be wrapped around the threads. Finally, the circumferential wrapping is applied to the outer area of ​​the metal part 102 to form an integral seal with the composite cylinder 101 for reinforcement. During the circumferential wrapping reinforcement, the carbon fiber yarn bundle hangs on the protruding tip at the tail of the pin bolt 103, which can increase the connection strength and rigidity between the composite cylinder 101 and the metal part 102.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A composite pressure-bearing cylinder connection structure, comprising a composite cylinder body (101), characterized in that: A metal part (102) is sealed at the top of the main body of the composite cylinder (101), and a pin bolt (103) is fastened between the surface of the metal part (102) and the surface of the main body of the composite cylinder (101).

2. The composite pressure-bearing cylinder connection structure as described in claim 1, characterized in that: The composite cylindrical body (101) has a cylindrical structure with a slot (105) at its top.

3. The composite pressure-bearing cylinder connection structure as described in claim 2, characterized in that: The insertion slot (105) has a circular structure, and the metal part (102) is tightly inserted into the insertion slot (105).

4. The composite pressure-bearing cylinder connection structure as described in claim 3, characterized in that: The inner surface of the insertion slot (105) has a first mounting hole (106), which is evenly distributed around the circumference and arranged in two rows, one above the other.

5. The composite pressure-bearing cylinder connection structure as described in claim 4, characterized in that: The metal part (102) has a cylindrical structure with a flange at its top and is pressed against the top of the composite cylindrical body (101).

6. The composite pressure-bearing cylinder connection structure as described in claim 4, characterized in that: The surface of the metal part (102) has a second mounting hole (107), which is a sealed fine thread hole structure.

7. The composite pressure-bearing cylinder connection structure as described in claim 6, characterized in that: The second mounting hole (107) is aligned with the first mounting hole (106), and the pin bolt (103) passes through the first mounting hole (106) and is threaded into the second mounting hole (107).

8. The composite pressure-bearing cylinder connection structure as described in claim 1, characterized in that: The inner end of the pin bolt (103) is fixed with a sealing cone (109), which is a conical structure.

9. The composite pressure-bearing cylinder connection structure as described in claim 4, characterized in that: A sealing ring (104) is fitted onto the surface of the pin bolt (103). The sealing ring (104) adopts an O-ring structure and is tightly abutted against the inside of the first mounting hole (106).

10. The composite pressure-bearing cylinder connection structure as described in claim 1, characterized in that: The outer end of the pin bolt (103) is provided with a protruding tip and has a screwing groove (108), which is an internal hexagonal structure.

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