High-tightness hose

Abstract

The utility model provides a flexible pipe with high sealing performance, which comprises a flexible pipe body and a joint, the flexible pipe body is of a multi-layer structure, the innermost layer of the flexible pipe body is an inner-layer rubber pipe, the outer side of the inner-layer rubber pipe is provided with a coating layer, the outer side of the coating layer is provided with a coated layer, the end part of the flexible pipe body is a sealing area, and the sealing area is formed by a single layer of the inner-layer rubber pipe; the connector is directly formed on the hose body in an injection molding mode and comprises a front-end rubber head and a rear-end rubber head, the front-end rubber head is connected to the inner-layer rubber pipe in a sleeved mode, and the front-end rubber head and the inner-layer rubber pipe are fixed in a melting and sealing mode to form sealing sleeved connection. And the rear-end rubber head is sleeved on the outer side of the coated layer and is fixed with the coated layer in a melting manner. Therefore, the inner-layer rubber tube and the coating layer are organically combined together through the rubber head serving as a medium, retraction and torsion of the inner-layer rubber tube during installation can be prevented, the problem of avoiding the insertion depth is avoided, and the inner-layer rubber tube and the coating layer are fused and completely attached together, so that the problems of air leakage of an interlayer and bulging of the coating layer do not exist.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas appliance technical field especially relates to a high sealing property hose. BACKGROUND

[0002] The gas pipe is a common gas appliance, which usually has a single-layer structure and a multi-layer structure. With the improvement of people's safety awareness, the gas pipe is usually a multi-layer metal clad pipe. The pipe body of the metal clad pipe has a three-layer structure, which includes an inner rubber tube formed by an extrusion process, a cladding layer formed by a weaving process, and a coating layer also formed by an extrusion process. The three layers are separated from each other and have gaps due to different processes, different materials, and different processing times. Therefore, the three points mentioned above are directly related to the feature of the pipe body, which is to overcome the separation of the pipe body, to ensure that the inner tube does not retract, the joint does not fall off, the inner rubber tube is not exposed, and the gas tightness is guaranteed.

[0003] To meet the standards, various structural design methods have been proposed on the market,

[0004] The first design method is shown in Figure 1 , in which a stainless steel bushing 15 is inserted into the pipe body to a position greater than 25 mm, and then the rear half of the rubber sleeve is sleeved on the pressing sleeve 14. The rubber sleeve with the pressing sleeve is sleeved on one end of the pipe body, and is tightly sleeved. The pressing sleeve and the bushing are overlapped and are buckled. The design concept is to clamp the rubber sleeve and the pipe wall (the inner rubber tube 11, the cladding layer 12, and the coating layer 13) by the inner and outer steel sleeves, and to relatively rivet the rubber sleeve, the pipe wall (the inner rubber tube, the cladding layer, and the coating layer) by mechanical extrusion, to meet the requirements of the inner tube not retracting, the joint not falling off, the inner rubber tube not being exposed, and the gas tightness being guaranteed.

[0005] For this method, there are problems: 1) During installation, the inner rubber tube is rotated (twisted) together with the valve's green head due to operation problems, resulting in the hose not being able to pass gas; 2) The inner end surface of the rubber sleeve and the end surface of the hose are separated and have gaps, and the position where the inner and outer steel sleeves overlap and are buckled actually also has gaps. When the green head is inserted into the hose and fastened with a hose clamp, there is still a gap between the rubber sleeve and the coating layer. When the pressure and flow are large, gas may enter the interlayer between the coating layer and the inner rubber tube, causing the coating layer to swell and having a risk of leakage; 3) Due to the large tolerance of the extrusion-formed inner rubber tube during processing and the small size tolerance of the bushing, the bushing may occasionally shift during assembly, and sometimes it may not meet the condition of an insertion depth of 25 mm.

[0006] The second design method is shown in Figure 2As shown, the pipe body includes an inner tube 21, a cladding layer 22 and a covering layer 23, a rubber head 26 is added to one end of the pipe body, a bushing 25 is inserted into the port of the pipe body to a position greater than 25mm, then a reserved pressing sleeve 24 is sleeved at the predetermined position (coinciding with the bushing 25), and finally buckling is performed. Utility model content

[0007] The utility model provides a kind of high sealing hose, which includes hose body and connector, the hose body is multilayer structure, the innermost layer of hose body is inner tube, cladding layer is provided on the outer side of inner tube, covering layer is further provided on the outer side of cladding layer, the end portion of the hose body is sealing area, and the sealing area is composed of single layer of inner tube;The connector is directly injection molded on the hose body;The connector includes front rubber head and rear rubber head, the front rubber head is sleeved on the inner tube, and the front rubber head is melt-sealed and fixed with the inner tube to form sealed sleeve connection;The rear rubber head is sleeved on the outer side of covering layer and is melt-fixed with the covering layer.

[0008] Preferably, the length of the sealing area is 1.5 cm-2.5 cm.

[0009] Preferably, an outer steel sleeve is further provided on the rear rubber head, and the rear rubber head is provided with an annular notch, and the outer steel sleeve is sleeved on the annular notch.

[0010] Preferably, the hose body is provided with a sealing area at both ends.

[0011] The utility model has the advantages that the connector is formed by injection molding, the front rubber head and the inner tube are melt-fixed with a large area by the injection molding process, and the rear rubber head and the covering layer are melt-fixed with a large area, so that the inner tube and the covering layer are organically combined together through the medium of the rubber head, which can prevent the inner tube from retracting and twisting during installation and eliminate the problem of insertion depth, because the rubber head is melt-fixed, the inner tube and the covering layer are completely attached together, and there is no problem of air leakage in the interlayer and bulging of the covering layer. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 、 2 As shown in the prior art technical scheme;

[0013] Figure 3 As shown in the utility model technical scheme. DETAILED DESCRIPTION

[0014] As Figure 3As shown, a high sealing soft tube includes a soft tube body and a joint, the soft tube body is a multi-layer structure, the innermost layer of the soft tube body is an inner rubber tube 31, an outer layer 32 is arranged outside the inner rubber tube, the end of the soft tube body is a sealing area 36, the length of the sealing area is 1.5-2.5 cm, preferably 2.0 cm; the sealing area 36 is composed of a single layer of the inner rubber tube 31, that is, no outer layer is arranged outside the inner rubber tube at the position of the sealing area, so that the inner rubber tube is directly exposed. The sealing area needs to have a certain length space to ensure that the front rubber head 351 and the inner rubber tube 31 have sufficient contact space in this area, and the preferred interval is 1.5-2.5 cm, and the contact space of both is not enough below 1.5 cm, which affects the connection strength, and the single-layer inner rubber tube 31 area is too long above 2.5 cm, which affects the strength of the soft tube body.

[0015] The outer layer 32 here can be a woven layer or a metal layer.

[0016] The joint 35 includes a front rubber head 351 and a rear rubber head 352, the front rubber head 351 is sleeved on the inner rubber tube 31, the front rubber head 351 is in direct contact with the inner rubber tube 31 to form a sealing sleeve, and the rear rubber head 352 is sleeved on the soft tube body and in contact with the outermost layer of the soft tube body.

[0017] In the embodiment, a covering layer 33 is further arranged outside the outer layer 32 of the soft tube body, and the rear rubber head 352 is sleeved outside the covering layer 33. In the utility model, the soft tube body is a three-layer structure, wherein the inner rubber tube 31 is the main layer for gas transmission; the outer layer 32 plays a protective role, such as a stainless steel woven mesh sleeve; and the covering layer 33 is generally a plastic sheath.

[0018] Of course, those skilled in the art should understand that the composition of the soft tube body has many ways, which can be two layers or three layers or more than three layers.

[0019] An outer steel sleeve 34 is further arranged on the rear rubber head, and the outer steel sleeve 34 is sleeved on the annular notch on the rear rubber head. The outer steel sleeve plays a decorative and protective role here, so that the tail end of the rear rubber head 352 is no longer exposed outside.

[0020] In the embodiment, the front rubber head 351 is fixedly connected with the inner rubber tube 31 by melting, so that the two are tightly combined, have good sealing performance, and have large connection strength.

[0021] The rear rubber head 352 is fixedly connected with the covering layer 33 by melting.

[0022] Specifically, in the embodiment, the manufacturing method of the sealing area and the joint is as follows:

[0023] Step 1, the sealing area is stripped of the coating layer; the coating layer is removed by cutting around it with a knife, and about 2 cm of the coating layer is stripped off. The coating layer is generally a plastic protective layer, which is relatively weak, so it can be directly cut around with a knife.

[0024] Step 2, then the exposed coating layer of the sealing area is removed, exposing the inner rubber tube; the coating layer is removed by cutting around it with a laser. The coating layer is a reinforcing layer, which is generally a stainless steel wire braid layer with high strength; therefore, when removing the coating layer, the steel wire needs to be cut off, and at the same time, the cutting depth needs to be accurately controlled to prevent damage to the inner rubber tube, so in this embodiment, a laser is used for cutting around; after the laser head is fixed, the power is adjusted, and the hose body is rotated to cut off;

[0025] Step 3, the outer steel sleeve is sleeved on the hose body;

[0026] Step 4, a front rubber head is formed on the outer side of the inner rubber tube of the sealing area by injection molding, and a rear rubber head is formed on the rear side of the sealing area; the front end of the hose body is inserted into the injection molding machine, and the injection molding machine directly injection molds the front rubber head and the rear rubber head on the sealing area and a part of the area (about 2 cm) on the rear side of the sealing area;

[0027] Step 5, the reserved outer steel sleeve is sleeved on the reserved position of the joint (rear rubber head).

[0028] The utility model discloses a joint formed by injection molding, through the injection molding process, the front rubber head and the inner rubber tube are fixed by melting with a large area, and the rear rubber head and the coating layer are fixed by melting with a large area, so that the inner rubber tube and the coating layer are organically combined together through the medium of the rubber head, which can prevent the inner rubber tube from retracting and twisting during installation, and there is no need to worry about the problem of insertion depth, because it is melted and completely attached together, there is no problem of interlayer air leakage and coating layer bulging.

[0029] Through experiments, the hose of the utility model can meet the requirements of 400N tensile and air tightness.

[0030] In addition to directly forming a joint by injection molding, those skilled in the art should understand that a ready-made joint can be used, and after being sleeved, it can be heated or glued to seal and connect the front rubber head with the inner rubber tube.

[0031] As a preferred scheme, in this embodiment, the hose body is provided with a sealing area at both ends, and the front rubber head 351 is fixedly connected with the inner rubber tube 31 by melting.

Claims

1. A high sealing soft tube comprising a tube body and a connector, the tube body being a multi-layer structure, the innermost layer of the tube body being an inner rubber tube, an outer layer being arranged outside the inner rubber tube, and a covering layer being arranged outside the outer layer, characterized in that: the end of the tube body is a sealing area, the sealing area being composed of a single layer of the inner rubber tube; the connector is directly injection molded on the tube body; the connector comprises a front rubber head and a rear rubber head, the front rubber head being sleeved on the inner rubber tube, the front rubber head being fixedly connected with the inner rubber tube by fusion sealing, forming a sealing sleeve connection, and the rear rubber head being sleeved outside the covering layer and being fixedly connected with the covering layer by fusion. The length of the sealing area is 1.5 cm-2.5 cm. An outer steel sleeve is arranged on the rear rubber head, and a ring-shaped notch is arranged on the rear rubber head, the outer steel sleeve being sleeved on the ring-shaped notch. The tube body is provided with the sealing area at both ends.

2. The high containment hose of claim 1, wherein, ​ 3. The high containment hose of claim 1, wherein, ​ 4. The high containment hose of claim 1, wherein, ​

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