A metal conduit protection cap

Abstract

The application belongs to the technical field of aviation equipment, and particularly relates to a metal conduit protection cap. The protection cap is integrally processed from elastic rubber material and comprises a main body, a cavity, a boss and a conical tail. The main body is a cylindrical structure with one end closed and the other end open, and the closed end is inwardly processed with the boss for limiting and sealing the bell mouth of the metal conduit. The cavity is formed between the outer wall of the boss and the inner wall of the main body, and is used for accommodating the bushing and the outer sleeve nut which are successively sleeved outside the bell mouth. The conical tail is a circular truncated cone shell structure, with the large-diameter end connected with the open end of the main body and the small-diameter end sleeved on the outer wall of the metal conduit below the bushing. The boss and the conical tail cooperate to complete the axial positioning and primary sealing of the protection cap on the conduit. In the natural state, the small-diameter end of the conical tail slightly smaller than the outer diameter of the metal conduit is tightly wrapped on the conduit to perform secondary sealing. The protection cap has high sealing efficiency and good effect, and can be recycled and reused.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aviation equipment, and particularly relates to a metal conduit protection cap. BACKGROUND

[0002] Metal conduits are widely applied in many systems such as aircraft hydraulic systems, fuel systems, pneumatic systems, environmental control systems and oxygen systems, and are used to transport fluid media to realize pressure transmission and drive execution. The cleanliness of the pipeline system directly affects the service life of system components and the reliable realization of system functions, therefore, the working medium of each system has strict control requirements for pollution level. According to the aviation metal conduit repair and manufacturing process, after completing the pipeline pressure test and cleaning work, the pipeline end needs to be wrapped. At present, the method of wrapping the pipeline end for protection is widely used in the whole industry, which is wrapping the pipeline end with a layer of neutral paraffin paper and a layer of kraft paper, and then using ramie thread to bundle twice. The whole protection process is low in efficiency, and the materials are used once and cannot be recycled. In the process of transferring, the wrapping thread may be loose to cause protection failure. In the process of conduit painting, there are defects such as thread marks on the paint surface of the conduit and unclear port painting lines. SUMMARY

[0003] Therefore, the purpose of the present application is to provide a metal conduit protection cap, which has good sealing effect and can be recycled and reused, thereby avoiding the waste of wrapping materials in the traditional process and improving the working efficiency of metal conduit protection.

[0004] The present application is realized by the following technical solutions:

[0005] A metal conduit protection cap, the end of the metal conduit is a flared mouth, and a bushing and an outer sleeve nut are sequentially sleeved outside the flared mouth, the protection cap is made of elastic rubber material and has an integrated structure, and includes a main body, a cavity, a boss and a conical tail;

[0006] The main body is a cylindrical structure with one end closed and one end open, and the closed end is inwardly processed with a boss for limiting and sealing the flared mouth of the metal conduit; the cavity is formed between the outer wall surface of the boss and the inner wall of the main body; the bushing and the outer sleeve nut sequentially sleeved outside the flared mouth are installed in the cavity;

[0007] The conical tail is a circular truncated cone shell structure, the large-diameter end is connected with the open end of the main body, and the small-diameter end is sleeved on the outer wall of the metal conduit below the bushing; in a natural state, the inner diameter of the small-diameter end of the conical tail is smaller than the outer diameter of the metal conduit;

[0008] When the protective cap is wrapped on the outer surface of the end of the metal conduit, the main body and the tapered tail rely on the material elasticity to press the inner wall of the bell mouth on the outer wall of the boss circular table structure, for axial positioning and primary sealing; the tapered tail small diameter end opening is wrapped on the metal conduit, for secondary sealing;

[0009] Further, the boss structure is that the upper end is a cylindrical structure, the lower end is a circular table structure with a small diameter end downward, an inverted nail structure or a hollow structure with a cylindrical upper end and a circular table structure with a small diameter end downward;

[0010] Further, in the natural state, the height of the metal conduit protective cap is 80% to 98% of the overall structure height formed after the outer bell mouth is sequentially sleeved with the bushing and the outer sleeve nut;

[0011] Further, the small diameter end of the tapered tail is connected with a skirt on the outer circumferential surface;

[0012] Further, the skirt is a circular planar structure with a 90° angle with the outer wall of the metal conduit;

[0013] Further, the outer surface of the closed end of the main body is integrally processed with an ear ring, the ear ring is a ring structure, and the label of the metal conduit is hung on the ear ring.

[0014] Beneficial effects:

[0015] (1) The metal conduit protective cap is provided, the boss in the main body of the protective cap cooperates with the tapered tail to complete the axial positioning and primary sealing of the protective cap on the metal conduit, avoids the sliding of the protective cap relative to the outer sleeve nut and the bushing from the end of the metal conduit and difficult positioning, thereby reducing the risk of foreign matter entering the protective cap, and not affecting the size positioning of the color ring identification near the conduit port; the small diameter end opening of the tapered tail is made of elastic rubber material, the diameter is slightly smaller than the outer diameter of the metal conduit, and is tightly wrapped on the metal conduit below the bushing under the elastic rubber elastic force, for secondary sealing; the two sealing methods significantly improve the protection effect on the cleanliness of the conduit.

[0016] (2) The metal conduit protective cap is provided, the height of the metal conduit protective cap is 0.2 to 2 mm smaller than the overall height of the end of the metal conduit, thereby ensuring that the metal conduit protective cap is sleeved on the end of the metal conduit, the elastic material is in a stretched state, the bushing and the outer sleeve nut fixed on the outer wall step of the bushing are pressed at the bell mouth, without using binding lines to prevent loosening, and avoiding defects such as paint line head marks on the paint surface of the metal conduit and unclear port paint lines caused by the use of binding lines for fixation during the paint spraying process.

[0017] (3) The metal conduit protective cap is provided with a skirt at the small-diameter end of the conical tail, the skirt is a circular plane structure with an angle of 90 degrees with the wall of the metal conduit, the skirt has a large area, and the skirt can be easily expanded by pulling with a hand or a tool, so that the metal conduit protective cap is conveniently installed on the end of the metal conduit.

[0018] (4) The metal conduit protective cap is provided with a ring-shaped structure ear ring on the outer surface of the closed end of the cap body, so that the ear ring is convenient for hanging a label of the metal conduit.

[0019] In summary, the metal conduit protective cap has simple use method, only needs one-time protection, the time is (2-5) seconds per cap, the dismounting time is also shortened, the protection work efficiency is significantly improved, the labor cost is saved, the work efficiency is improved, the protective cap can be recycled and reused, and the waste of wrapping materials in the traditional process is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The protective cap structure described in Example 1 is shown in the schematic view.

[0021] Figure 2 The protective cap structure described in Example 1 is shown in the schematic view.

[0022] Figure 3 The protective cap structure described in Example 1 is shown in the schematic view.

[0023] Figure 4 The protective cap structure described in Example 1 is shown in the schematic view. Figure 3 The protective cap structure described in Example 1 is shown in the schematic view.

[0024] Figure 5 The protective cap structure described in Example 1 is shown in the schematic view.

[0025] Figure 6 The protective cap structure described in Example 1 is shown in the schematic view.

[0026] Wherein, 1 is a main body, 2 is an ear ring, 3 is a cavity, 4 is a boss, 5 is a conical tail, 6 is a skirt, 7 is an outer sleeve nut, 8 is a bushing, 9 is a metal conduit, 10 is a horn mouth, and 11 is a metal conduit protective cap. DETAILED DESCRIPTION

[0027] The application will be described in detail below with reference to the drawings and examples.

[0028] Example 1

[0029] The metal conduit protective cap provided in the embodiment is shown in the schematic view. Figures 3-4As shown, the end of the metal conduit 9 is processed with a horn mouth 10 with an inner conical structure, and the horn mouth 10 is externally sequentially provided with a bushing 8 and an outer nut 7; the bushing 8 is a cylindrical structure with open ends, and a large-diameter end-up circular table surface is processed in the upper end, which is in abutment with the outer wall of the horn mouth 10, and the lower end of the bushing 8 is in abutment with the metal conduit connected to the lower end of the horn mouth 10; an annular stepped surface is processed on the outer wall of the bushing 8, and the outer nut 7 is fixedly installed on the stepped surface;

[0030] The protective cap is integrally formed of elastic rubber material, and includes a main body 1, a cavity 3, a boss 4 and a conical tail 5. Figures 1-2 As shown, the main body 1 is a cylindrical structure with one end closed and one end open, and a boss 4 is processed in the closed end, the upper end of the boss 4 is a cylindrical structure, and the lower end is a circular table structure with a small-diameter end down, which limits and seals the horn mouth; the cavity 3 is formed between the outer wall surface of the boss 4 and the inner wall of the main body; the horn mouth 10 is sequentially provided with the bushing 8 and the outer nut 7 outside, which are installed in the cavity 3.

[0031] The conical tail 5 is a circular table shell structure, the large-diameter end is connected to the open end of the main body 1, and the small-diameter end is sleeved on the outer wall of the metal conduit 9 below the bushing 8; in a natural state, the small-diameter end inner diameter of the conical tail 5 is smaller than the outer diameter of the metal conduit 9; when the protective cap is wrapped on the outer surface of the end of the metal conduit 9, the main body 1 and the conical tail 5 rely on the material elasticity to press the inner wall surface of the horn mouth 10 on the outer wall surface of the boss 4 circular table structure, for axial positioning and primary sealing, to avoid the protective cap from loosening or moving, and to protect the internal cleanliness of the metal conduit; the small-diameter end opening of the conical tail 5 is tightly wrapped on the metal conduit 9 by the elasticity of the rubber material, the lower end surface of the bushing 8 blocks and limits the further contraction of the small-diameter end opening of the conical tail, for secondary sealing, to further improve the sealing performance of the metal conduit 9;

[0032] Further, the outer circumferential surface of the small-diameter end of the conical tail is connected with a skirt 6; in this embodiment, the skirt 6 is a circular planar structure with a 90° angle with the metal conduit wall, the planar structure has a large area, and the skirt can be easily expanded by using hands or tools to pull the skirt, to facilitate the installation of the metal conduit protective cap 11 on the end of the metal conduit.

[0033] Further, the ear ring 2 is integrally processed on the outer surface of the closed end of the main body 1, and the ear ring 2 is a ring structure, which is convenient for hanging the nameplate of the metal conduit 9.

[0034] Further, the ear ring 2 is integrally processed on the outer surface of the closed end of the main body 1, and the ear ring 2 is a ring structure, which is convenient for hanging the nameplate of the metal conduit 9.

[0035] Further, in the natural state, the height of the metal conduit protection cap 11 is 80% to 98% of the height of the overall structure formed by the close-fitting of the metal conduit bell mouth 10, the bushing 8 and the sleeve nut 7, so as to ensure that the metal conduit protection cap 11 is tightly fitted, the elastic material is in a stretched state, and the bushing 8 and the sleeve nut 7 fixed on the outer wall step of the bushing are pressed at the bell mouth 10 to prevent loosening.

[0036] The specific dimensions of each part of the metal conduit protection cap 11 are selected according to the outer diameter of the metal conduit and the size of the sleeve nut.

[0037] Example 2

[0038] As shown in Figure 5 Example 2, only the structure of the boss is replaced, i.e., the structure of the boss is replaced from "cylindrical structure at the upper end and circular table structure with small-diameter end downward" to "inverted nail structure, the nail structure is composed of a cylindrical rod part and a circular table head part with small-diameter end downward, the diameter of the cylindrical rod part is smaller than the diameter of the small-diameter end of the circular table structure, so as to increase the cavity area, reduce the boss area, save the protection cap material, and reduce the cost.

[0039] Example 3

[0040] As shown in Figure 6 Example 3, only the boss structure in Example 1 is processed into a hollow structure, and an ear ring is integrally processed outside the boss area on the outer surface of the closed end of the main body; compared with the solid boss structure, the hollow structure saves the protection cap material and reduces the cost.

[0041] Example 4

[0042] This embodiment provides a use method of the protection cap on the basis of Example 1, which includes the following steps:

[0043] (1) The bell mouth 10, the bushing 8 and the sleeve nut 7 of the metal conduit 9 end head after completion of the cleaning work are sequentially and closely fitted, and then the skirt 6 is pulled to open the small-diameter end opening of the conical tail 5 and to be fitted on the sleeve nut 7, so that the outer wall surface of the lower end of the boss 4 is in close contact with the inner conical surface of the bell mouth 10;

[0044] (2) The skirt 6 is pulled, and the conical tail 5 is continuously pulled to the small-diameter end opening fitted on the outer wall of the metal conduit 9 at the lower end of the bushing 8, and the small-diameter end opening of the conical tail 5 is in close contact with the metal conduit 9 under the elastic contraction; at this time, the boss 4 is in close contact and pressed with the inner conical surface of the bell mouth 10 under the elastic force of the small-diameter end opening of the conical tail;

[0045] (3) The label of the metal conduit 9 is hung on the ear ring 2, and then the metal conduit 9 is transported and delivered to the next process.

[0046] The protection method in the traditional process needs to be bundled twice, and the bundling time is about (8-15) seconds per one. The protection cap described in the application only needs to be protected once, and the protection of the end of the metal pipe is completed only in 2-5 seconds. The disassembly time is also shortened, the protection work efficiency is improved, the labor cost is saved, and the work efficiency is improved.

[0047] To sum up, the above is only a preferred embodiment of the application, and is not used to limit the protection scope of the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A protective cap for a metal conduit, the end of the metal conduit being flared, the flared end being fitted with a bushing and an outer nut in that order, characterized in that: The protective cap is made of elastic rubber material and has an integrated structure, comprising a main body, a cavity, a boss and a conical tail; The main body is a cylindrical structure with one end closed and the other end open, and the closed end is internally provided with a boss for limiting and sealing the bell mouth of the metal pipe; the cavity is formed between the outer wall of the boss and the inner wall of the main body; the bushing and the outer nut are sequentially sleeved outside the bell mouth and are installed in the cavity; The conical tail is a circular truncated cone shell structure, with a large-diameter end connected to the open end of the main body and a small-diameter end sleeved on the outer wall of the metal pipe below the bushing; in a natural state, the small-diameter end of the conical tail has an inner diameter smaller than the outer diameter of the metal pipe; When the protective cap is wrapped around the outer surface of the end of the metal pipe, the main body and the conical tail rely on the material elasticity to press the inner wall surface of the bell mouth against the outer wall surface of the boss circular truncated cone structure for axial positioning and primary sealing; the small-diameter end of the conical tail is wrapped around the metal pipe for secondary sealing; The boss has a structure with a cylindrical upper end, a circular truncated cone structure with a small-diameter end below, an inverted nail structure or a hollow structure with a cylindrical upper end and a circular truncated cone structure with a small-diameter end below; In a natural state, the height of the metal pipe protective cap is 80% to 98% of the overall structure height formed after the bushing and the outer nut are sequentially sleeved outside the bell mouth; The small-diameter end of the conical tail is connected with a skirt.

2. The protective cap for a metal conduit according to claim 1, wherein: The skirt is a circular planar structure with a 90° angle with the outer wall of the metal pipe.

3. A protective cap for a metal conduit as claimed in claim 1 or 2, wherein: The closed end of the main body is integrally processed with an ear ring, which is a ring structure, and the label of the metal pipe is hung on the ear ring.

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