Three-layer telescopic hose

Abstract

The utility model belongs to the field of hoses for conveying fluid materials, and discloses a three-layer telescopic hose which comprises a hollow inner pipe, an outer pipe which is coaxial with the inner pipe and is sleeved on the periphery of the inner pipe, and a middle pipe which is arranged between the inner pipe and the outer pipe and is coaxial with the inner pipe, the inner pipe is made of elastic materials, the inner pipe extends in the length direction of the inner pipe along with increase of pressure of fluid injected into the hollow structure of the inner pipe, and the inner pipe gradually recovers to the initial state along with reduction of the pressure. When no pressurized fluid is present within the hose, the hose automatically retracts to a retracted state and when pressurized fluid is introduced into the hose, the hose automatically expands to an extended state. The flexible hose is relatively easy to store and manipulate due to its relatively short length and its relatively light weight in the retracted state, and the flexible hose can be located at any position where fluid is required in the extended state.

Description

Technical Field

[0001] The utility model relates to the field of hoses for transporting fluid materials, in particular to a three-layer telescopic hose. Background Art

[0002] Hoses are used for connection and are used in places far from the water source. One end of the hose is connected to the water source, and the other end is extended to the place where the water is needed to provide water. Existing hoses are fixed in length, take up a lot of space, and are not conducive to storage. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a three-layer telescopic hose.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a three-layer telescopic hose, comprising a hollow inner tube, an outer tube coaxial with the inner tube and sleeved on the outer circumference of the inner tube, and an intermediate tube coaxial with the inner tube and arranged between the inner tube and the outer tube;

[0005] The inner tube is formed of an elastic material. As the pressure of the fluid injected into the hollow structure increases, the inner tube stretches along its length. As the pressure decreases, the inner tube gradually returns to its original state.

[0006] The intermediate tube is made of elastic or non-elastic material;

[0007] The outer tube is a bendable outer tube made of non-elastic material;

[0008] The intermediate tube is arranged around the outer circumference and length of the inner tube, and the outer tube is arranged around the circumference and length of the intermediate tube; when pressurized fluid is injected into the hose, the inner tube is longitudinally extended along its length direction and expanded along its radial direction, thereby increasing the length of the inner tube to an expanded state; when the fluid pressure is reduced, the inner tube contracts to a shortened state.

[0009] According to the present invention, further, when there is fluid pressure, the interiors of the intermediate tube and the outer tube are made of a material that does not stretch longitudinally and transversely.

[0010] According to the present invention, further, the middle tube is made of nylon, polyester or polypropylene; and the outer tube is made of polyvinyl chloride.

[0011] According to the present invention, further, the elastic material used to prepare the inner tube has an elongation of up to 6:1 and can be expanded to 6 times its original length.

[0012] According to the present invention, further, the inner tube and the intermediate and outer tubes are made of materials that will not kink or tangle themselves when the inner tube and the intermediate and outer tubes are in their expanded states.

[0013] According to the present invention, further, a mark is formed on the outer tube.

[0014] According to the present invention, further, the mark can be identified when the hose is in an expanded state, but cannot be identified when the hose is in a shortened state.

[0015] According to the present invention, further, the injected pressurized fluid is gas or semi-solid substance.

[0016] According to the present invention, further, the hose is a garden hose.

[0017] According to the present invention, further, the hose is a fire hose.

[0018] Compared with the existing technology, the beneficial effects of the present invention are:

[0019] The hose is composed of three layers of material: an inner tube made of an elastic material, an intermediate tube made of an elastic or inelastic material, and an outer tube made of an inelastic material. The intermediate tube is disposed around the circumference and length of the inner tube, while the outer tube is disposed around the circumference and length of the intermediate tube. The intermediate tube and the outer tube are attached and connected to the inner tube only at two ends and remain separate, unattached, unbonded, and unconnected from the inner tube along the entire length of the hose between the first and second ends. When no pressurized fluid is present within the hose, the hose automatically collapses to a collapsed state. When pressurized fluid is introduced into the hose, the hose automatically expands to an extended state. In the collapsed state, the hose is relatively easy to store and maneuver due to its relatively short length and light weight. In the extended state, the hose can be positioned anywhere fluid is needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an axonometric diagram of the three-layer telescopic hose of the present invention;

[0021] Figure 2 This is a schematic cross-sectional view of the three-layer telescopic hose of the present invention. DETAILED DESCRIPTION

[0022] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0023] like Figure 1 and 2The figure shows a three-layer telescopic hose comprising a hollow inner tube 100, an outer tube 200 coaxial with and fitted around the inner tube 100, and an intermediate tube 300 coaxial with the inner tube 100 and disposed between the inner and outer tubes 100 and 200. The inner tube 100 is formed of an elastic material. As the fluid pressure within the inner tube 100 increases, the inner tube 100 expands along its length. As the pressure decreases, the inner tube 100 gradually returns to its original state. The intermediate tube 300 is made of an elastic or non-elastic material, while the outer tube 200 is a non-elastic, bendable, elongated outer tube. This hose can be used in various applications, including garden hoses and fire hoses used by firefighters.

[0024] In this embodiment of the present application, a first connector (not shown) is fixedly connected to one end of the inner tube 100, the intermediate tube 300, and the outer tube 200 on the same side, and a second connector (not shown) is fixedly connected to the opposite end. The first connector connects the hose to a source of pressurized fluid, and the second connector connects the hose to a fluid flow restrictor. The source of pressurized fluid can be a faucet in a house, and the hose can be easily connected and disconnected from it. The fluid flow restrictor thereby increases the fluid pressure within the hollow structure of the inner tube 100. This increased fluid pressure causes the inner tube to extend along its length, thereby increasing the overall length of the hose to an expanded state. When the fluid pressure between the first and second connectors decreases, the hose as a whole contracts to a shortened length. The intermediate tube 300 and the outer tube 200 are made of a material that does not stretch longitudinally or laterally when force is applied to the interior of the intermediate and outer tubes. Preferably, the elastic material of inner tube 100 has an elongation ratio of up to 6:1 and can expand to six times its extended or unextended length. Intermediate tube 300 is made of a material selected from nylon, polyester, or polypropylene. Outer tube 200 is made of polyvinyl chloride. It should be noted that the first and second connectors can optionally utilize restrictor sleeves, which are conventional structures and will not be further described here.

[0025] In the embodiment of the present application, the inner tube 100 , the middle tube 300 and the outer tube 200 are made of materials that will not kink or tangle themselves when the inner tube 100 , the middle tube 300 and the outer tube 200 are in their expanded states.

[0026] In the embodiment of the present application, a mark is provided on the outer circumferential surface of the outer tube 200. The mark is identifiable when the hose is in an expanded state, i.e., a stretched state, and is not identifiable when the hose is in a contracted state, i.e., a shortened state.

[0027] In the embodiment of the present application, gas can be injected into the hose as a pressurized fluid, or a semi-solid substance can be injected into the hose.

[0028] Working principle: fluid is introduced into the hose, and the first connector is fixed to the first ends of the inner tube, the intermediate tube and the outer tube; the second connector is fixed to the second ends of the inner tube, the intermediate tube and the outer tube; the inner tube, the intermediate tube and the outer tube are fixed together only at the first end and the second end, and the inner tube, the intermediate tube and the outer tube are not fixed together between the first end and the second end; the first connector is connected to the source of pressurized fluid; the second connector is connected to the fluid flow restrictor; the fluid pressure between the first connector and the second connector in the hose is increased, and the increase in fluid pressure causes the inner tube to automatically expand longitudinally along the length of the inner tube and automatically expand laterally along the width of the inner tube, thereby increasing the length and width of the hose to an expanded state; when the fluid pressure drops, the fluid pressure difference between the first connector and the second connector is reduced to elimination, and the hose automatically contracts to its original length and diameter; thus, when there is no fluid pressure difference between the first connector and the second connector, the inner tube automatically moves relative to the intermediate tube and the outer tube.

[0029] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and improvements are possible without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed for the present invention is defined by the appended claims and their equivalents.

Claims

1. A three-layer telescopic hose, characterized by: The invention comprises a hollow inner tube, an outer tube coaxial with the inner tube and sleeved on the outer circumference of the inner tube, and an intermediate tube coaxial with the inner tube and arranged between the inner tube and the outer tube; The inner tube is formed of an elastic material. As the pressure of the fluid injected into the hollow structure increases, the inner tube stretches along its length. As the pressure decreases, the inner tube gradually returns to its original state. The intermediate tube is made of elastic or non-elastic material; The outer tube is a bendable outer tube made of non-elastic material; The intermediate tube is arranged around the outer circumference and length of the inner tube, and the outer tube is arranged around the circumference and length of the intermediate tube; when pressurized fluid is injected into the hose, the inner tube is longitudinally extended along its length direction and expanded along its radial direction, thereby increasing the length of the inner tube to an expanded state; when the fluid pressure is reduced, the inner tube contracts to a shortened state.

2. The three-layer telescopic hose according to claim 1, characterized in that: When the intermediate tube and the outer tube are under fluid pressure, the interiors of the intermediate tube and the outer tube are made of a material that does not stretch longitudinally or transversely.

3. The three-layer telescopic hose according to claim 2, characterized in that: The middle tube is made of nylon, polyester or polypropylene; the outer tube is made of polyvinyl chloride.

4. The three-layer telescopic hose according to claim 1, characterized in that: The elastic material from which the inner tube is made has an elongation ratio of up to 6:1 and can expand to 6 times its original length.

5. The three-layer telescopic hose according to claim 1, characterized in that: The inner tube and the intermediate and outer tubes are made of a material that will not kink and twist around itself when the inner tube and the intermediate and outer tubes are in their expanded states.

6. The three-layer telescopic hose according to claim 1, characterized in that: Markings are formed on the outer tube.

7. The three-layer telescopic hose according to claim 6, characterized in that: The marking is identifiable when the hose is in the expanded state, but is not identifiable when the hose is in the shortened state.

8. The three-layer telescopic hose according to claim 1, characterized in that: The injected pressurized fluid is a gas or a semi-solid substance.

9. The three-layer telescopic hose according to claim 1, characterized in that: The hose is a garden hose.

10. The three-layer telescopic hose according to claim 1, characterized in that: The hose is a fire hose.

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