Flame-retardant rubber tube for airplane

Abstract

The utility model provides a flame-retardant rubber tube for an airplane, which relates to the field of flame-retardant rubber tubes, and comprises an inner rubber layer, two guide rings are fixedly connected on the outer peripheral surface of a guide tube in a linear array, the guide tube and the guide rings jointly form a connecting structure, a seat body is mounted on the outer sides of the guide rings, an annular groove is formed in the seat body, the annular groove is a guide groove, and the inner rubber layer and the guide ring are arranged in a staggered manner. A positioning bolt is installed in the seat body, a connector is fixedly connected to the left end face of the seat body, and the inner rubber layer is of an annular structure, so that the problems that an existing flame-retardant rubber pipe is poor in flame-retardant effect, and when open fire is generated, a traditional air pipe cannot effectively resist fire behaviors, so that the air hose loses efficacy, then aircraft faults are caused, and potential safety hazards are increased are solved; by arranging the fireproof and flame-proof inner rubber layer, after the flame retardant property of the hose is increased under the condition that the original use condition is met, the afterflame time in a second-vertical test is less than or equal to 15S, the dripping combustion time is less than or equal to 5S, the combustion length is less than or equal to 203mm, an imported part can be replaced, and the cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of flame-retardant rubber hoses, and particularly relates to a flame-retardant rubber hose for aircraft. Background Art

[0002] A rubber hose is a hollow flexible tubular rubber product. Its tube body structure is mainly composed of an inner rubber layer, a skeleton layer and an outer rubber layer. The material of the skeleton layer can be cotton fiber, various synthetic fibers, carbon fiber or asbestos, metal wire, etc. A rubber hose without a skeleton layer is a pure rubber hose. Generally, the materials of the inner and outer rubber layers are usually natural rubber, styrene-butadiene rubber, and cis-butadiene rubber; for oil-resistant rubber hoses, nitrile rubber and chloroprene rubber are selected; for acid and alkali resistant and high temperature resistant hoses, ethylene propylene rubber, chlorosulfonated polyethylene rubber, fluorine, silicone rubber, etc. are selected. Among them, the outer rubber layer can also be replaced with materials such as synthetic fiber and stainless steel wire according to working conditions. The rubber hose is a crucial supporting product in rubber products, and it has a very close relationship with all fields of the national economy. Especially in promoting the development of industry, agriculture, mining, transportation and national defense scientific research, it plays a very important role. The uses of rubber hoses are extremely extensive. They are usually used to transport or suck various gases, liquids, viscous fluids and powdery solid materials under positive or negative pressure conditions. Summarizing the working conditions, common types of hoses include: water pipes, hot water pipes, steam pipes, hydraulic pipes, chemical pipes, air pipes, etc. The use of air pipes: mainly used in industries such as mines, construction, engineering, shipbuilding, and steel production to transport air, inert gases and water, etc. Due to the influence of its own use environment factors, the air pipe for aircraft needs to increase the flame retardant performance. Traditional air pipes refer to rubber hoses for transporting air, generally using natural rubber and styrene-butadiene rubber as the main materials. The problems are as follows: The existing flame-retardant rubber hoses using natural rubber and styrene-butadiene rubber have a low oxygen index and poor flame retardant effect. When there is an open fire, the traditional air pipe cannot effectively resist the fire, resulting in the failure of the air hose, and then causing aircraft failures, increasing safety hazards. Moreover, when in use, there is a lack of an effective quick steering adjustment structure, so that the rubber hose cannot be adjusted for steering once it is installed.

[0003] Therefore, in view of the deficiencies of the above solutions in actual production and implementation, they are modified and improved. At the same time, in the spirit of pursuing excellence and with the assistance of professional knowledge and experience, and after various ingenious ideas and tests, the present utility model is created. A flame-retardant rubber hose for aircraft is provided to solve the problems that the existing flame-retardant rubber hoses using natural rubber and styrene-butadiene rubber have a low oxygen index and poor flame retardant effect. When there is an open fire, the traditional air pipe cannot effectively resist the fire, resulting in the failure of the air hose, and then causing aircraft failures, increasing safety hazards. Summary of the Utility Model

[0004] The present utility model provides a flame-retardant rubber hose for aircraft, which solves the problems that the existing flame-retardant rubber hoses made of natural rubber and styrene-butadiene rubber have a low oxygen index and poor flame-retardant effect. When an open flame occurs, the traditional air hose cannot effectively resist the fire, resulting in the failure of the air hose, and further causing aircraft failures, increasing potential safety hazards.

[0005] The technical solution of the present utility model is realized as follows: A flame-retardant rubber hose for aircraft includes an inner rubber layer. A conduit is installed inside the inner rubber layer. A sealing strip is fixedly connected to the outer peripheral surface of the conduit, and the main body of the sealing strip is a ring structure. The sealing strip and the conduit together form a connection structure. A baffle is installed inside the longitudinal member of the conduit, and the main body of the baffle is a circular structure. The diameter of the baffle is the same as the inner wall diameter of the conduit. A knob is fixedly connected to the front end of the baffle. The knob is located at the front end of the conduit, and the knob and the baffle together form a closed structure. A guide ring is fixedly connected to the outer peripheral surface of the conduit, and the main body of the guide ring is a ring structure. There are two guide rings in total, and the two guide rings are fixedly connected to the outer peripheral surface of the conduit in a linear array. The conduit and the guide ring together form a connection structure. A seat body is installed outside the guide ring. An annular groove is opened inside the seat body, and this annular groove is a guiding groove. A positioning bolt is installed inside the seat body, and a connection head is fixedly connected to the left end surface of the seat body:

[0006] As a preferred embodiment, a fiber braided layer is coated outside the inner rubber layer, and the fiber braided layer is a circular braided structure.

[0007] As a preferred embodiment, the fiber braided layer is a cotton thread braided structure.

[0008] As a preferred embodiment, rubber rings are fixedly connected to the outside of the fiber braided layer, and there are two rubber rings in total. The two rubber rings are fixedly connected to the front and rear sides of the outer peripheral surface of the fiber braided layer in a linear array.

[0009] As a preferred embodiment, a metal wire spiral layer is fixedly connected to the inside of the rubber ring, and the metal wire spiral layer and the rubber ring together form a protective structure.

[0010] As a preferred embodiment, the wire diameter of the metal wire spiral layer is 0.5 mm to 1 mm. An outer covering layer is coated outside the rubber ring, and wear-resistant rubber strips are fixedly connected to the outside of the outer covering layer in an annular array.

[0011] After adopting the above technical solution, the beneficial effects of the present utility model are:

[0012] 1. In the present utility model, by providing an inner rubber layer with fire prevention and combustion isolation functions, under the condition of meeting the original usage requirements, after the hose is enhanced with flame retardant performance, it can meet the following standards in the 12 - second vertical test: after - flame burning time ≤ 15S, burning time of dripping objects ≤ 5S, and burning length ≤ 203mm. It can replace imported parts and reduce costs.

[0013] 2. In the present utility model, compared with the situation where using chlorosulfonated polyethylene rubber (CSM), nitrile rubber (NBR), ethylene - propylene rubber (EPDM), and chlorinated polyethylene rubber (CM) can also achieve the production of flame - retardant hoses according to the technical solutions in the fourth part, but after replacing the main material, there will be risks that other performances do not meet the requirements of flame - retardant hoses, manufacturing difficulties, and cost increase. This design can significantly reduce the usage cost.

[0014] 3. In the present utility model, by fixedly connecting a guide ring to the outer side of the conduit, when the conduit is assembled into the inside of the seat body, the guide ring fixedly connected to the outer peripheral surface of the conduit can rotate along the guide groove formed in the seat body, so that after the conduit and the rubber hose are installed, they can be quickly adjusted for steering according to the actual assembly needs, thus achieving a more practical purpose. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a front - side view structural schematic diagram of the cut - away flame - retardant hose of the present utility model;

[0017] Figure 2 It is a combined structural schematic diagram of the flame - retardant hose of the present utility model;

[0018] Figure 3 It is a left - view structural schematic diagram of the flame - retardant hose of the present utility model;

[0019] Figure 4 It is a combined structural schematic diagram of the rubber ring and the metal wire spiral layer of the flame - retardant hose of the present utility model;

[0020] Figure 5 It is a combined structural schematic diagram of the inner rubber layer and the fiber braided layer of the flame - retardant hose of the present utility model;

[0021] Figure 6 It is a structural schematic diagram of the outer covering layer and the wear - resistant rubber strip of the flame - retardant hose of the present utility model;

[0022] Figure 7 Schematic diagram of the combination structure of the baffle and the knob of the flame-retardant rubber hose of the present utility model;

[0023] In the figure, 1, inner rubber layer; 2, fiber braided layer; 3, rubber ring; 4, metal wire spiral layer; 5, outer covering layer; 6, wear-resistant rubber strip; 7, ferrule; 8, conduit; 9, sealing strip; 10, baffle; 11, knob; 12, guide ring; 13, seat body; 14, guide groove; 15, positioning bolt; 16, connecting head. Specific embodiments

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0025] Such as Figures 1-7As shown in the figure, a flame-retardant rubber hose for an aircraft includes: an inner rubber layer 1. Inside the inner rubber layer 1, a conduit 8 is installed. On the outer peripheral surface of the conduit 8, a sealing strip 9 is fixedly connected. The main body of the sealing strip 9 is of an annular structure. The sealing strip 9 and the conduit 8 together form a connection structure. Inside the inner side of the longitudinal member in the conduit 8, a baffle 10 is installed. The main body of the baffle 10 is of a circular structure. The diameter of the baffle 10 is the same as the inner wall diameter of the conduit 8. At the front end of the baffle 10, a knob 11 is fixedly connected. The knob 11 is located at the front end position of the conduit 8. The knob 11 and the baffle 10 together form a closed structure. On the outer peripheral surface of the conduit 8, a guide ring 12 is fixedly connected. The main body of the guide ring 12 is of an annular structure. There are two guide rings 12 in total. The two guide rings 12 are fixedly connected to the outer peripheral surface of the conduit 8 in a linear array. The conduit 8 and the guide ring 12 together form a connection structure. Outside the guide ring 12, a seat body 13 is installed. Inside the seat body 13, an annular groove is opened. This annular groove is a guide groove 14. Inside the seat body 13, a positioning bolt 15 is installed. On the left end face of the seat body 13, a connection head 16 is fixedly connected. The inner rubber layer 1 is made of chloroprene rubber, and its formula components are: 100 parts of chloroprene rubber; 3 - 8 parts of active magnesium oxide; 0.5 - 2 parts of stearic acid; 0.5 - 2 parts of microcrystalline wax; 2 - 6 parts of antioxidant; 5 - 10 parts of antimony trioxide; 40 - 70 parts of carbon black N550; 10 - 50 parts of light calcium carbonate; 5 - 35 parts of decabromodiphenylethane; 5 - 20 parts of dibutyl sebacate; 0.5 - 1.5 parts of accelerator NA-22; 3 - 10 parts of zinc oxide. The inner rubber layer 1 is of an annular structure. The wire diameter of the metal wire spiral layer 4 is 0.5 mm - 1 mm. The outer side of the rubber ring 3 is coated with an outer covering layer 5. On the outer side of the outer covering layer 3, wear-resistant rubber strips 6 are fixedly connected in an annular array. Its material is flame-retardant polyester fiber, and the wire diameter is 0.3 mm - 0.6 mm. A ferrule 7 is sleeved outside the outer covering layer 5.

[0026] Among them, the outer side of the inner rubber layer 1 is coated with a fiber braided layer 2. The fiber braided layer 2 is of an annular structure. The fiber braided layer 2 is a cotton thread braided structure. The wire diameter of the cotton thread used for braiding is 0.5 mm - 0.8 mm.

[0027] Among them, outside the fiber braided layer 2, a rubber ring 3 is fixedly connected. There are two rubber rings 3 in total. The two rubber rings 3 are fixedly connected to the front and back sides of the outer peripheral surface of the fiber braided layer 2 in a linear array. Inside the rubber ring 3, a metal wire spiral layer 4 is fixedly connected. The metal wire spiral layer 4 and the rubber ring 3 together form a protection structure.

[0028] When in use, by coating the outer side of the inner rubber layer 1 with a fiber braided layer 2, when it is in use, the fireproof and flame-retardant operation of the inner rubber layer 1 can also be realized by sleeving the two rubber rings 3 onto the outer side of the fiber braided layer 2 coated on the outer side of the inner rubber layer 1.

[0029] And after the rubber ring 3 and the wire spiral layer 4 are wrapped, it is only necessary to wrap the outer covering layer 5 on the outside of the rubber ring 3 and the wire spiral layer 4. And after the wrapping is completed, the wear-resistant rubber strip 6 fixedly connected to the outer peripheral surface of the outer covering layer 5 can be used to increase the wear resistance of the overall rubber tube;

[0030] And when in use, the catheter 8 can be inserted into the inner position of the inner rubber layer 1 and tightly connected by using the sealing strip 9 fixedly connected to its outer side surface. Then, the connector 16 fixedly connected to the outside of the seat body 13 is connected to an external device. And after the connection is completed, the catheter 8 can be rotated along the guide groove 14 formed in the seat body 13 by using the guide ring 12 fixedly connected to its outer side surface to achieve rapid adjustment. And after the adjustment is completed, the positioning bolt 15 is screwed into the seat body 13 to limit the rotation of the catheter 8;

[0031] And when it is necessary to close the catheter 8, the baffle 10 can be flipped by holding the knob 11, so that the baffle 10 is changed to a parallel state to realize the emergency closing operation of the catheter 8, thereby achieving the purpose of quickly obstructing the gas.

Claims

1. A flame-retardant rubber hose for aircraft, characterized in that, It includes an inner rubber layer (1). A conduit (8) is installed inside the inner rubber layer (1). A sealing strip (9) is fixedly connected to the outer peripheral surface of the conduit (8). The main body of the sealing strip (9) is an annular structure. The sealing strip (9) and the conduit (8) together form a connection structure. A baffle (10) is installed inside the longitudinal member of the conduit (8). The main body of the baffle (10) is a circular structure. The diameter of the baffle (10) is the same as the inner wall diameter of the conduit (8). A knob (11) is fixedly connected to the front end of the baffle (10). The knob (11) is located at the front end of the conduit (8). The knob (11) and the baffle (10) together form a closed structure. A guide ring (12) is fixedly connected to the outer peripheral surface of the conduit (8). The main body of the guide ring (12) is an annular structure. There are two guide rings (12) in total. The two guide rings (12) are fixedly connected to the outer peripheral surface of the conduit (8) in a linear array. The conduit (8) and the guide ring (12) together form a connection structure. A seat body (13) is installed outside the guide ring (12). An annular groove is formed inside the seat body (13). This annular groove is a guide groove (14). A positioning bolt (15) is installed inside the seat body (13). A connection head (16) is fixedly connected to the left end face of the seat body (13).

2. The flame-retardant rubber hose for aircraft according to claim 1, wherein, The outer side of the inner rubber layer (1) is coated with a fiber braided layer (2). The fiber braided layer (2) is an annular braided structure.

3. The flame-retardant rubber hose for aircraft according to claim 2, characterized in that, The fiber braided layer (2) is a cotton thread braided structure.

4. The flame-retardant rubber hose for aircraft according to claim 3, characterized in that, Two rubber rings (3) are fixedly connected to the outer side of the fiber braided layer (2). The two rubber rings (3) are fixedly connected to the front and rear sides of the outer peripheral surface of the fiber braided layer (2) in a linear array.

5. The flame-retardant rubber hose for aircraft according to claim 4, characterized in that, A metal wire spiral layer (4) is fixedly connected to the inner side of the rubber ring (3). The metal wire spiral layer (4) and the rubber ring (3) together form a protection structure.

6. The flame-retardant rubber hose for aircraft according to claim 5, wherein, The wire diameter of the metal wire spiral layer (4) is 0.5 mm to 1 mm. An outer covering layer (5) is coated on the outer side of the rubber ring (3). Wear-resistant rubber strips (6) are fixedly connected to the outer side of the outer covering layer (3) in an annular array. A ferrule (7) is sleeved on the outer side of the outer covering layer (5).

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