A ventilation connecting shaft for curing composite gas cylinder

Abstract

The present invention relates to a ventilation connecting shaft for curing composite gas cylinders, wherein the connecting shaft is a hollow tubular structure, a plurality of air holes are arranged on the side wall of the connecting shaft, and threads are arranged at both ends of the connecting shaft. The present invention processes the connecting shaft that plays a connecting and rotating role for the gas cylinder during curing into a porous hollow shaft, so that the air in the rotary curing furnace can enter the interior of the gas cylinder and rise and fall the temperature synchronously with the air outside the gas cylinder. The problem of temperature gradient in the thickness direction of the gas cylinder when the gas cylinder is heated and lowered is solved, especially the problem of high energy consumption and low efficiency caused by the need to cure the thick composite layer of the high-pressure gas cylinder in batches, while improving the uniformity of heating inside and outside the composite layer of the gas cylinder, which can effectively reduce the quality problems of the gas cylinder.

Description

Technical Field

[0001] The invention belongs to the field of composite material gas cylinder preparation, and in particular relates to a ventilation connecting shaft for curing a composite material gas cylinder and a preparation and use method thereof. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention, and should not necessarily be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] Composite gas cylinders are a new type of gas cylinder developed in modern times. They have the advantages of light weight, high pressure resistance, corrosion resistance, good fatigue resistance, and strong designability. Their application fields are becoming more and more extensive. Composite gas cylinders are generally made by winding continuous fiber reinforced resin-based composite materials on the surface of metal linings or plastic linings and then curing them. In order to control the resin content of the composite material layer and ensure the uniformity of the resin content and the surface quality of the gas cylinder, the curing method is generally to connect the gas cylinder mouth to a solid connecting shaft and fix it on a rotatable chuck or equivalent tooling for rotational curing. However, when preparing high-pressure composite gas cylinders, it is necessary to increase the thickness of the composite material layer to improve the strength of the gas cylinder. In order to ensure the uniformity and degree of curing of the composite material layer, either a method of multiple winding and curing is adopted, which will reduce work efficiency and increase energy consumption; or a method of extending the heating and cooling time and the insulation time is adopted. This not only has low work efficiency and high energy consumption, but also causes the composite material layer to be "burnt on the outside and tender on the inside", resulting in inconsistent curing degrees inside and outside the composite material layer, generating thermal stress, which at the least reduces the strength of the gas cylinder, and at the worst, due to the large temperature difference between the inside and outside of the gas cylinder during heating and cooling, the composite material layer cracks or debonds from the inner liner, causing the gas cylinder to be scrapped. Summary of the invention

[0004] In order to overcome the above problems, the present invention provides a ventilation connecting shaft for composite material gas cylinder curing and a preparation and use method. The present invention processes the connecting shaft that connects and rotates the gas cylinder during curing into a porous hollow shaft, so that the air in the rotary curing furnace can enter the gas cylinder and rise and fall in temperature synchronously with the air outside the gas cylinder.

[0005] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0006] A first aspect of the present invention provides a ventilation connecting shaft for curing a composite gas cylinder, wherein the connecting shaft is a hollow tubular structure, a plurality of air holes are arranged on the side wall of the connecting shaft, and threads are arranged at both ends of the connecting shaft.

[0007] The second aspect of the present invention provides a composite material gas cylinder curing device, comprising: any of the above-mentioned connecting shafts, the gas cylinder mouth is connected to the connecting shaft and fixed on a rotatable chuck or equivalent tooling.

[0008] The connecting shaft that connects and rotates the gas cylinder during curing is processed into a porous hollow shaft, so that the air in the rotary curing furnace can enter the gas cylinder and rise and fall in temperature synchronously with the air outside the gas cylinder.

[0009] The third aspect of the present invention provides a composite material gas cylinder molding method, comprising:

[0010] Connect any of the above-mentioned connecting shafts to the gas cylinder and place it in a rotary curing furnace. The opening of the connecting shaft faces the direction of the airflow, so that the blast airflow can enter the gas cylinder through the connecting shaft, so that the inside and outside of the gas cylinder are heated and cooled simultaneously. When the gas cylinder is rotating and curing, the airflow in the furnace can enter the inner liner of the gas cylinder, so that the inside and outside of the gas cylinder are heated and cooled synchronously. This solves the problem of temperature gradient in the thickness direction of the gas cylinder when the gas cylinder is heated and cooled, especially the high energy consumption and low efficiency caused by the need to cure the thick composite layer of the high-pressure gas cylinder in batches. At the same time, it improves the uniformity of heating inside and outside the composite layer of the gas cylinder, which can effectively reduce the quality problems of the gas cylinder.

[0011] The beneficial effects of the present invention are:

[0012] (1) The ventilating connecting shaft for curing composite gas cylinders described in the present invention can allow the airflow in the furnace to enter the inner liner of the gas cylinder when the gas cylinder is rotating and curing, so that the temperature inside and outside the gas cylinder rises and falls synchronously. This solves the problem of temperature gradient in the thickness direction of the gas cylinder when the gas cylinder is heated and cooled, especially the problem of high energy consumption and low efficiency caused by the need to cure the thick composite layer of the high-pressure gas cylinder in batches. At the same time, it improves the uniformity of heating inside and outside the composite layer of the gas cylinder, which can effectively reduce the quality problems of the gas cylinder.

[0013] (2) The device of the present application has a simple structure, is easy to operate, has low cost, is highly practical, and is easy to mass produce. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0015] Figure 1 This is a schematic diagram of a ventilated connecting shaft; 1: air holes on the connecting shaft surface; 2: connecting threads of the connecting shaft; 3: axial through hole of the connecting shaft;

[0016] Figure 2 This is the assembly diagram of the S-type gas cylinder (double-mouth);

[0017] Figure 3 This is the assembly drawing of T-type gas cylinder (single port). DETAILED DESCRIPTION

[0018] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used in the present application have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0019] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0020] As introduced in the background technology, the curing efficiency of composite gas cylinders is currently low and the curing uniformity of the composite material layer is poor. Therefore, the present invention proposes a ventilation connecting shaft for curing composite gas cylinders, which is processed into a through-hole tubular shape, and on the premise of ensuring that the connecting shaft can support the weight of the gas cylinder, as many holes as possible are punched on the surface of the connecting shaft to communicate with the axial hole inside the connecting shaft. When in use, try to make the opening of the connecting shaft face the blast direction in the furnace so that the airflow can enter the connecting shaft and then enter the inner liner of the gas cylinder.

[0021] In some embodiments, the ventilating connecting shaft is more suitable for metal liner gas cylinders, especially S-type composite gas cylinders, that is, gas cylinders with openings at both ends;

[0022] In some embodiments, the diameter of the connecting shaft should be no less than the diameter of the mouth of the composite gas cylinder, and the thread at one end of the connecting shaft matches the thread of the mouth of the gas cylinder.

[0023] like Figure 1 As shown, the present invention processes a commonly used solid connecting shaft or hollow connecting shaft into a ventilating shaft with an axial through hole and surface openings, specifically including a connecting shaft surface air hole 1, a connecting shaft connecting thread 2, and a connecting shaft axial through hole 3.

[0024] The axial through hole of the connecting shaft is one or more combinations of equal diameter holes, variable diameter holes or holes with polygonal cross sections;

[0025] The shape of the pores on the surface of the connecting shaft is one or more combinations of cylindrical holes, conical holes, drum-shaped holes, polygonal holes, spline holes and other special-shaped holes, and the number and size of the pores on the surface are not limited.

[0026] The connecting shaft connecting thread is a preferred structural form of the present invention, including but not limited to "inner support" and "outer clamp" forms that can play an equivalent connection role with the gas cylinder.

[0027] A ventilation connecting shaft for curing a composite material gas cylinder. The connecting shaft is a hollow tubular structure. A plurality of air holes are arranged on the side wall of the connecting shaft. Threads are arranged at both ends of the connecting shaft.

[0028] In the present application, the connecting shaft that connects and rotates the gas cylinder during curing is processed into a porous hollow shaft, so that the inside and outside of the gas cylinder are heated simultaneously, thereby improving the curing efficiency and the curing uniformity of the composite material layer.

[0029] The present application does not impose any special limitation on the specific structure of the connecting shaft. Therefore, in some embodiments, the cross-section of the connecting shaft is a hole of equal diameter, a hole of variable diameter, or a hole of polygonal cross-section to meet the requirements of different working conditions.

[0030] The present application does not make any special limitation on the specific structure of the connecting shaft. Therefore, in some embodiments, the air hole is one or more combinations of cylindrical holes, conical holes, drum-shaped holes, polygonal holes, spline holes or other special-shaped holes to adapt to the use requirements of different working conditions and facilitate processing.

[0031] In some embodiments, on the connecting shaft, the inner diameter of the hollow tube of the threaded section is smaller than the inner diameter of the hollow tube of the non-threaded section, so that the threaded section can be screwed into the gas cylinder to facilitate fitting and sealing with the mouth of the gas cylinder.

[0032] In some embodiments, the centerline direction of the air hole is 42° to 48° with the axial direction of the connecting shaft, which increases the flow rate and flow velocity of air entering the gas cylinder, allowing it to flow fully in the T-shaped composite gas cylinder, ensuring that all parts of the gas cylinder can be heated and cooled synchronously with the air outside the gas cylinder.

[0033] In some embodiments, the diameter of the air holes is 10-15 mm, and the distance between the centers of the air holes is 30-40 mm. With as few holes as possible, the air intake efficiency is improved, the processing is facilitated, and the connecting shaft has good mechanical strength.

[0034] The present invention also provides a composite material gas cylinder curing device, comprising: any of the above-mentioned connecting shafts, the gas cylinder mouth is connected to the connecting shaft and fixed on a rotatable chuck or equivalent tooling.

[0035] The connecting shaft that connects and rotates the gas cylinder during curing is processed into a porous hollow shaft, so that the air in the rotary curing furnace can enter the gas cylinder and rise and fall in temperature synchronously with the air outside the gas cylinder.

[0036] The present invention will be further described in detail below in conjunction with specific embodiments. It should be noted that the specific embodiments are intended to explain the present invention rather than to limit it.

[0037] Embodiment 1:

[0038] like Figure 2As shown in the figure, the wrapped gas cylinder is an S-shaped gas cylinder with a volume of 60L, and the diameter of the bottle mouth at both ends is 60mm, and the length of the bottle mouth is 35mm. The connecting shaft is made of a stainless steel rod with a length of 40cm and a diameter of 80mm. The diameter of the axial through hole 3 at the connection of the thread 2 is 35mm, and the diameter of the axial through hole 3 in other parts is 50mm. The diameter of the surface pores 1 is 15mm, and the spacing between the centers of the pores 1 is 40mm. The connecting shaft thread 2 matches the gas cylinder mouth thread, and the total length of the thread 2 is equal to the length of the bottle mouth thread. When in use, connect the connecting shaft to the gas cylinder and put it into a rotary curing furnace to ensure that at least one end of the connecting shaft faces the blast wind direction, that is, the blast airflow can enter the gas cylinder through the connecting shaft, so as to achieve the purpose of simultaneously raising and lowering the temperature inside and outside.

[0039] Embodiment 2:

[0040] like Figure 3 As shown in the figure, the wrapped gas cylinder is a T-shaped gas cylinder with a capacity of 20L, a bottle mouth diameter of 32mm, and a bottle mouth length of 35mm. The connecting shaft is made of a stainless steel pipe with a length of 30cm and a diameter of 40mm. The diameter of the axial through hole 3 at the connection of the thread 2 is 20mm, and the diameter of the axial through hole 3 in other parts is 30mm. The diameter of the surface pores 1 is 10mm, and the spacing between the centers of the pores 1 is 30mm. The centerline direction of the surface pores 1 is 45° to the axial direction of the connecting shaft (the threaded end to the non-threaded end of the connecting shaft is the positive direction). The thread 2 of the open connecting shaft matches the thread of the gas bottle mouth, and the total length of the thread 2 is equal to the length of the thread of the bottle mouth. When in use, connect the connecting shaft to the gas cylinder and put it into the rotary curing furnace. The opening of the connecting shaft should face the direction of the airflow as much as possible, that is, the blast airflow can enter the gas cylinder through the connecting shaft, so as to achieve the purpose of simultaneously raising and lowering the temperature inside and outside.

[0041] Example 3

[0042] A ventilation connecting shaft for curing a composite gas cylinder, the connecting shaft is a hollow tubular structure, a plurality of air holes 1 are arranged on the side wall of the connecting shaft, and threads 2 are arranged at both ends of the connecting shaft.

[0043] In the present application, the connecting shaft that connects and rotates the gas cylinder during curing is processed into a porous hollow shaft, so that the inside and outside of the gas cylinder are heated simultaneously, thereby improving the curing efficiency and the curing uniformity of the composite material layer.

[0044] Example 4

[0045] A ventilation connecting shaft for curing a composite gas cylinder, the connecting shaft is a hollow tubular structure, a plurality of air holes 1 are arranged on the side wall of the connecting shaft, and threads 2 are arranged at both ends of the connecting shaft.

[0046] The cross section 3 of the connecting shaft is a hole with a constant diameter, a hole with a variable diameter, or a hole with a polygonal cross section to meet the requirements of different working conditions.

[0047] Example 5

[0048] A ventilation connecting shaft for curing a composite gas cylinder, the connecting shaft is a hollow tubular structure, a plurality of air holes 1 are arranged on the side wall of the connecting shaft, and threads 2 are arranged at both ends of the connecting shaft.

[0049] The air hole 1 is one or more combinations of cylindrical holes, conical holes, drum-shaped holes, polygonal holes, spline holes or other special-shaped holes to meet the use requirements of different working conditions and facilitate processing.

[0050] Example 6

[0051] A ventilation connecting shaft for curing a composite gas cylinder, the connecting shaft is a hollow tubular structure, a plurality of air holes 1 are arranged on the side wall of the connecting shaft, and threads 2 are arranged at both ends of the connecting shaft.

[0052] On the connecting shaft, the inner diameter of the hollow tube of the threaded section is smaller than the inner diameter of the hollow tube of the non-threaded section, so that the threaded section 2 can be screwed into the gas cylinder to facilitate fitting and sealing with the gas cylinder mouth.

[0053] Example 7

[0054] A ventilation connecting shaft for curing a composite gas cylinder, the connecting shaft is a hollow tubular structure, a plurality of air holes 1 are arranged on the side wall of the connecting shaft, and threads 2 are arranged at both ends of the connecting shaft.

[0055] The centerline direction of the air hole 1 is 42° to 48° with the axial direction of the connecting shaft, which increases the flow rate and flow velocity of air entering the gas cylinder, allowing it to flow fully in the T-shaped composite gas cylinder, ensuring that all parts of the gas cylinder can be heated and cooled synchronously with the air outside the gas cylinder.

[0056] Example 8

[0057] A ventilation connecting shaft for curing a composite gas cylinder, the connecting shaft is a hollow tubular structure, a plurality of air holes 1 are arranged on the side wall of the connecting shaft, and threads 2 are arranged at both ends of the connecting shaft.

[0058] The diameter of the air holes 1 is 10-15 mm, and the distance between the centers of the air holes 1 is 30-40 mm. With as few holes as possible, the air intake efficiency is improved, the processing is convenient, and the connecting shaft has good mechanical strength.

[0059] Example 9

[0060] A device for curing composite gas cylinders, comprising: a connecting shaft as described in any one of Examples 3-8, the mouth of the gas cylinder is connected to the connecting shaft and fixed to a rotatable chuck or equivalent tooling.

[0061] The connecting shaft that connects and rotates the gas cylinder during curing is processed into a porous hollow shaft, so that the air in the rotary curing furnace can enter the gas cylinder and rise and fall in temperature synchronously with the air outside the gas cylinder.

[0062] Example 10

[0063] A composite material gas cylinder molding method, comprising:

[0064] Connect the connecting shaft described in any one of Examples 3-8 to the gas cylinder, and place it in a rotary curing furnace. The opening of the connecting shaft faces the direction of the airflow, so that the blast airflow can enter the gas cylinder through the connecting shaft, so that the inside and outside of the gas cylinder are heated and cooled simultaneously. When the gas cylinder is rotating and curing, the airflow in the furnace can enter the inner liner of the gas cylinder, so that the inside and outside of the gas cylinder are heated and cooled synchronously. The problem of temperature gradient in the thickness direction of the gas cylinder when the gas cylinder is heated and cooled is solved, especially the problem of high energy consumption and low efficiency caused by the need to cure the thick composite layer of the high-pressure gas cylinder in batches. At the same time, the uniformity of heating inside and outside the composite layer of the gas cylinder is improved, which can effectively reduce the quality problems of the gas cylinder.

[0065] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to perform equivalent replacements on parts thereof. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention. Although the above describes the specific implementation modes of the present invention in conjunction with the accompanying drawings, it is not intended to limit the protection scope of the present invention. Those skilled in the art should understand that, based on the technical solution of the present invention, various modifications or deformations that can be made by those skilled in the art without creative labor are still within the protection scope of the present invention.

Claims

1. A ventilating connecting shaft for curing composite gas cylinders, characterized in that: The connecting shaft is a hollow tubular structure, a plurality of air holes are arranged on the side wall of the connecting shaft, and threads are arranged at both ends of the connecting shaft; The centerline direction of the air hole is 42°~48° with the axial direction of the connecting shaft; The diameter of the pores is 10-15 mm, and the distance between the centers of the pores is 30-40 mm.

2. The ventilating connecting shaft for curing composite gas cylinders according to claim 1, characterized in that: The cross section of the connecting shaft is a hole of equal diameter, a hole of variable diameter or a hole of polygonal cross section.

3. The ventilating connecting shaft for curing composite gas cylinders according to claim 1, characterized in that: The air hole is one or a combination of a cylindrical hole, a conical hole, a drum-shaped hole, a polygonal hole, and a spline hole.

4. The ventilating connecting shaft for curing composite gas cylinders according to claim 1, characterized in that: On the connecting shaft, the inner diameter of the hollow tube in the threaded section is smaller than the inner diameter of the hollow tube in the non-threaded section.

5. The ventilating connecting shaft for curing composite gas cylinders according to claim 1, characterized in that: The connection between the thread and the gas cylinder is an "inner support" or "outer clamp" type.

6. The ventilating connecting shaft for curing composite gas cylinders according to claim 1, characterized in that: The connecting shaft is connected to the mouth of the gas cylinder and is fixed on a rotatable chuck.

7. The ventilating connecting shaft for curing composite gas cylinders according to claim 6, characterized in that: The gas cylinder is an S-shaped composite material gas cylinder or a T-shaped composite material gas cylinder.

8. The ventilating connecting shaft for curing composite gas cylinders according to claim 6, characterized in that: The preparation method of the composite gas cylinder is as follows: the connecting shaft is connected to the gas cylinder, and the connection is placed in a rotary curing furnace, with the opening of the connecting shaft facing the direction of the airflow, so that the blast airflow can enter the gas cylinder through the connecting shaft, so that the temperature inside and outside the gas cylinder is increased and decreased simultaneously.

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