Gas insulation connecting pipe

Abstract

The utility model discloses a fuel gas insulation connecting pipe which comprises a corrugated pipe body, a first connecting sleeve is fixed at the front end of the corrugated pipe body and communicated with the corrugated pipe body, an end connector is arranged at the front end of the first connecting sleeve, and a center penetrating through hole formed in the middle of the end connector is communicated with the first connecting sleeve. The front end of the first connecting sleeve and the outer side wall of the rear end of the end connector are fixed in the same insulating rubber sleeve, and a gap is formed between the front end of the first connecting sleeve and the rear end of the end connector. The first connecting sleeve and the end connector are in insulation connection in an injection molding mode, the number of machining steps is small, the effect is good, efficiency is high, the nut is arranged on the end connector in a sleeving mode and does not make contact with the insulation rubber sleeve, and the insulation effect of the insulation rubber sleeve is guaranteed.

Description

Technical field:

[0001] The utility model relates to the technical field of gas pipes, and more specifically to a gas insulating connecting pipe. Background technology:

[0002] The gas pipe is a special pipeline for transporting combustible gas. It is a metal gas pipe hose that replaces the traditional clip-on rubber hose. It can solve the defects of rubber hoses such as easy falling off, easy aging, easy insect bites, and short service life.

[0003] At present, gas pipes usually use metal bellows, which can also be bent arbitrarily like rubber hoses to adapt to the use environment. Therefore, metal gas pipes have gradually replaced rubber hoses. However, since the bellows are made of metal, they are conductive. During the home decoration process, some gas appliances are not fully grounded and the joints are energized. After the nut on the ordinary stove pipe is connected to the external thread of the water heater, the connection position is a metal connection, which causes the bellows to be conductive, which is prone to flash explosion problems and has a great safety hazard.

[0004] Therefore, an insulated gas pipe for a stove with Chinese patent application number 202320636712.7 is provided, in which an insulating flange is provided between the bellows and the joint, which can block the circuit loop between the bellows and the joint, and at the same time, in combination with a gasket, can block the circuit loop between the bellows and the mounting carrier, thereby eliminating the problem of conductivity of the bellows, and further eliminating the problem of flash explosion caused by conductivity, and the use is safe and reliable; a coating layer is provided, which can protect the bellows, extend the service life, and at the same time insulate the bellows, further improve the safety of use, and completely eliminate the conductivity problem; however, the structures such as the insulating flange and gasket provided therein increase the number of parts and components at its end, increase the number of processes, and increase the manufacturing cost. At the same time, the insulating flange must be installed first, and then the neck of the bellows must be deformed and flattened to achieve connection, and then the gasket must be installed, which is very troublesome and has high processing cost. Moreover, the lower part of the nut is inserted into the insulating flange, and when it rotates, it is easy to produce friction with the outer wall of the insulating flange, which is easy to damage and rupture the insulating flange, affecting the insulation effect of the insulating flange. Utility model content:

[0005] The purpose of the utility model is to provide a gas insulating connecting pipe to address the deficiencies of the prior art. It adopts injection molding to achieve insulating connection between the first connecting sleeve and the end connecting head. It has fewer processing steps, good effect and high efficiency. Moreover, the nut is sleeved on the end connecting head and does not contact with the insulating rubber sleeve, thereby ensuring the insulating effect of the insulating rubber sleeve.

[0006] The technical solutions of the utility model are as follows:

[0007] A gas insulating connecting pipe comprises a bellows main body, a first connecting sleeve is fixed to the front end of the bellows main body, the first connecting sleeve is communicated with the bellows main body, an end connecting head is arranged at the front end of the first connecting sleeve, and a central through hole formed in the middle of the end connecting head is communicated with the first connecting sleeve;

[0008] The front end of the first connecting sleeve and the rear end outer side wall of the end connecting head are fixed in the same insulating rubber sleeve, and there is a distance between the front end of the first connecting sleeve and the rear end of the end connecting head.

[0009] By injection molding, the insulating rubber sleeve realizes split connection between the first connecting sleeve and the end connecting head, and the processing is convenient and simple, and the connection is firm.

[0010] The rear end of the first connecting sleeve is welded and fixed on the front end surface of the bellows body.

[0011] The outer wall of the bellows body is coated with an insulating coating layer, the inner wall of the rear end of the steel sleeve is pressed against the outer side of the insulating coating layer at the front end of the bellows body, the rear of the first connecting sleeve and the end connector are in the steel sleeve, and the inner wall of the steel sleeve is pressed against the outer wall of the insulating rubber sleeve. The insulating coating layer can protect the bellows body and achieve insulation, thereby improving safety.

[0012] The front end outer wall of the first connecting sleeve is formed with an outer tooth portion, the rear outer wall of the end connector is formed with an outer tooth portion, and the insulating rubber sleeve is fixed to the outer side of the outer tooth portion by injection molding. The outer tooth portion increases the connection area and friction force, and is firmly fixed.

[0013] The front end of the end connector extends out of the front end of the insulating rubber sleeve, and an external thread for connection is formed on the outer side wall of the front end of the end connector.

[0014] The front end of the end connector extends out of the front end of the insulating rubber sleeve, and a connecting nut is movably connected to the front end of the end connector.

[0015] The beneficial effects of the utility model are:

[0016] The first connection sleeve and the end connection head are insulated by injection molding, which has fewer processing steps, good effect and high efficiency. Moreover, the nut is sleeved on the end connection head and does not contact the insulating rubber sleeve, thereby ensuring the insulating effect of the insulating rubber sleeve. Description of the drawings:

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 Another structural schematic diagram of the utility model;

[0019] Figure 3 for Figure 1 Schematic diagram of the local structure after the rubber clamping sleeve and the external connecting nut are installed. Specific implementation method:

[0020] Example: See Figures 1 to 2 As shown, a gas insulating connecting pipe includes a bellows body 10, and a first connecting sleeve 20 is fixed to the front end of the bellows body 10. In this embodiment, the rear end of the first connecting sleeve 20 is welded and fixed to the front end surface of the bellows body 10 by welding, and the first connecting sleeve 20 is communicated with the bellows body 10; wherein, the outer wall of the bellows body 10 is coated with an insulating coating layer 1 to ensure insulation protection of the bellows body 10.

[0021] The front end of the first connecting sleeve 20 is provided with an end connector 30, and a central through hole formed in the middle of the end connector 30 communicates with the first connecting sleeve 20;

[0022] The front end of the first connecting sleeve 20 and the rear end outer wall of the end connecting head 30 are fixed in the same insulating rubber sleeve 40 , and there is a distance between the front end of the first connecting sleeve 20 and the rear end of the end connecting head 30 .

[0023] Furthermore, the inner side wall of the rear end of the steel sleeve 50 is pressed against the outer side of the insulating coating 1 at the front end of the corrugated tube body 10 to achieve fixation (the two can be further fixed by coating an adhesive), the rear of the first connecting sleeve 20 and the end connecting head 30 are in the steel sleeve 50, and the inner side wall of the steel sleeve 50 is pressed against the outer side wall of the insulating rubber sleeve 40.

[0024] The steel sleeve 50 is a stepped sleeve with a stepped through hole formed in the middle thereof, a large-diameter hole section at the front end and a small-diameter hole section at the rear end, the inner side wall of the small-diameter hole section is pressed against the outer side wall of the front end of the insulating coating layer 1 and fixed, the inner side wall of the large-diameter hole section is pressed against the outer side wall of the insulating rubber sleeve 40 and fixed, and the rear end face of the insulating rubber sleeve 40 is pressed against the rear end face of the large-diameter hole section and fixed.

[0025] An external tooth portion is formed on the front outer wall of the first connecting sleeve 20, and an external tooth portion is formed on the rear outer wall of the end connecting head 30. The insulating rubber sleeve 40 is fixed to the outside of the external tooth portion by injection molding. The external tooth portion increases the connection area with the insulating rubber sleeve 40, thereby improving friction and fixing firmness.

[0026] During the manufacturing of this embodiment, the inner side wall of the rear end of the steel sleeve 50 is first pressed against the outer side of the insulating coating 1 at the front end of the corrugated pipe body 10 to achieve clamping fixation (it uses multiple mold pressing blocks to press against the outer side wall of the steel sleeve 50, and all the mold blocks are brought together to press the inner side wall of the rear end of the steel sleeve 50 against the outer side of the insulating coating 1 at the front end of the corrugated pipe body 10 to achieve clamping fixation. This structure is a conventional structure and will not be described in detail here). At this time, the first connecting sleeve 20 is in the steel sleeve 50, and then it is installed at the injection mold. At the same time , insert the rear part of the end connector 30 into the front part of the steel sleeve 50 and place it in the injection mold, then, perform injection molding, and inject the insulating rubber material into the gap between the steel sleeve 50 and the first connecting sleeve 20 and the end connector 30 to form the insulating rubber sleeve 40, so that the outer teeth formed on the front outer wall of the first connecting sleeve 20 and the outer teeth on the outer wall of the rear part of the end connector 30 are fixed on the inner wall of the insulating rubber sleeve 40, and the inner wall of the large diameter hole section of the steel sleeve 50 is fixed on the outer wall of the insulating rubber sleeve 40, so as to achieve a fixed connection.

[0027] It is easy to process and install, and can be completed by only one injection molding.

[0028] Furthermore, the front end of the end connector 30 extends out of the front end of the insulating rubber sleeve 40, and an external thread for connection is formed on the outer side wall of the front end of the end connector 30, such as Figure 1 As shown, a radially extending reinforcing rotating portion is formed on the outer side wall of the portion of the end connector 30 extending out of the front end of the insulating rubber sleeve 40. The reinforcing rotating portion is generally hexagonal, which can be conveniently clamped by a tool, such as a wrench, so that the reinforcing rotating portion does not rotate, thereby facilitating the rotation and disassembly of the externally threaded connector and other parts of the front end of the end connector 30.

[0029] like Figure 3 As shown, in Figure 1 On the basis of, an external connecting nut member 70 is screwed on the outer side wall of the front end of the end connecting head 30, and a rubber clamping sleeve 80 is inserted in the external connecting nut member 70, and the outer side wall of the rubber clamping sleeve 80 is close to the inner side wall of the external connecting nut member 70, and a radially extending edge 71 is formed on the inner side wall of the front end of the external connecting nut member 70, and the front end of the rubber clamping sleeve 80 is pressed against the radially extending edge 71, and the rear end of the rubber clamping sleeve 80 is pressed against the front end of the end connecting head 30, and the middle through-hole extending front and rear of the rubber clamping sleeve 80 is communicated with the end connecting head 30.

[0030] The front and rear faces of the rubber clamping sleeve 80 are both tapered walls protruding outward, and the middle of the tapered wall at the rear end of the rubber clamping sleeve 80 extends into the front end of the end connector 30. The tapered wall at the rear end of the rubber clamping sleeve 80 presses against the inner tapered wall formed on the inner side wall of the front end of the end connector 30 to achieve pressing, and the tapered wall at the front end of the rubber clamping sleeve 80 presses against the rear end of the inner side wall of the radially extending edge 71 to achieve compression and fixation. This structure allows the subsequent connecting pipeline to insert and clamp the connecting end into the middle through hole of the rubber clamping sleeve 80 to achieve connection.

[0031] like Figure 2 As shown, the front end of the end connector 30 extends out of the front end of the insulating rubber sleeve 40 , and a connecting nut 60 is movably connected to the front end of the end connector 30 .

[0032] An extension edge 31 extending radially outward is formed on the outer wall of the front end of the end connector 30, and the rear part of the connecting nut 60 is inserted into the front end of the end connector 30. An inner radial extension edge 51 is formed on the inner wall of the rear end of the connecting nut 60. The inner radial extension edge 51 is located behind the extension edge 31, and the inner diameter of the inner radial extension edge 51 is smaller than the outer diameter of the extension edge 31.

[0033] The nut 50 is sleeved on the end connector 30 and does not contact the insulating rubber sleeve 40 , thereby ensuring the insulating effect of the insulating rubber sleeve 40 .

[0034] Meanwhile, the end connector 30 in this embodiment is of a straight line type, and it may also be of a right-angle elbow shape, so that it can be connected and installed according to different installation requirements, and its insulation effect is good.

[0035] The drawings in this embodiment only show the structure at the front end of the bellows body 10. The structure at the rear end may be the same as that at the front end, or the front end may be Figure 1 The structure of the back end is Figure 2 The structure can be manufactured according to the different needs of users, thereby meeting different usage needs.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A gas insulating connecting pipe, comprising a bellows body (10), characterized in that: A first connecting sleeve (20) is fixed to the front end of the bellows body (10), the first connecting sleeve (20) is in communication with the bellows body (10), an end connecting head (30) is provided at the front end of the first connecting sleeve (20), and a central through hole formed in the middle of the end connecting head (30) is in communication with the first connecting sleeve (20); The front end of the first connection sleeve (20) and the rear end outer wall of the end connection head (30) are fixed in the same insulating rubber sleeve (40), and there is a distance between the front end of the first connection sleeve (20) and the rear end of the end connection head (30).

2. A gas insulating connecting pipe according to claim 1, characterized in that: The rear end of the first connecting sleeve (20) is welded and fixed to the front end surface of the bellows body (10).

3. A gas insulating connecting pipe according to claim 1, characterized in that: The outer wall of the bellows body (10) is coated with an insulating coating layer (1), the inner wall of the rear end of the steel sleeve (50) is pressed against the outer side of the insulating coating layer (1) at the front end of the bellows body (10), the rear parts of the first connecting sleeve (20) and the end connecting head (30) are located in the steel sleeve (50), and the inner wall of the steel sleeve (50) is pressed against the outer wall of the insulating rubber sleeve (40).

4. A gas insulating connecting pipe according to claim 3, characterized in that: The steel sleeve (50) is a stepped sleeve having a stepped through hole formed in the middle thereof, the front end of which is a large-diameter hole section and the rear end of which is a small-diameter hole section, the inner side wall of the small-diameter hole section is pressed against the outer side wall of the front end of the insulating coating layer (1), the inner side wall of the large-diameter hole section is pressed against the outer side wall of the insulating rubber sleeve (40), and the rear end surface of the insulating rubber sleeve (40) is pressed against the rear end surface of the large-diameter hole section.

5. The gas insulating connecting pipe according to claim 1, characterized in that: An external tooth portion is formed on the front outer wall of the first connecting sleeve (20), an external tooth portion is formed on the rear outer wall of the end connecting head (30), and the insulating rubber sleeve (40) is fixed on the outer side of the external tooth portion by injection molding.

6. The gas insulating connecting pipe according to claim 1, characterized in that: The front end of the end connector (30) extends out of the front end of the insulating rubber sleeve (40), and an external thread for connection is formed on the outer side wall of the front end of the end connector (30).

7. A gas insulating connecting pipe according to claim 6, characterized in that: An external connection nut (70) is screwed onto the outer side wall of the front end of the end connection head (30), a rubber clamping sleeve (80) is inserted into the external connection nut (70), a radially extending edge (71) is formed on the inner side wall of the front end of the external connection nut (70), the front end of the rubber clamping sleeve (80) is pressed against the radially extending edge (71), the rear end of the rubber clamping sleeve (80) is pressed against the front end of the end connection head (30), and the middle through hole extending forward and backward of the rubber clamping sleeve (80) is communicated with the end connection head (30).

8. The gas insulating connecting pipe according to claim 1, characterized in that: The front end of the end connector (30) extends out of the front end of the insulating rubber sleeve (40), and a connecting nut (60) is movably connected to the front end of the end connector (30).

9. A gas insulating connecting pipe according to claim 8, characterized in that: An extension edge (31) extending radially outward is formed on the front end outer wall of the end connector (30); the rear portion of the connecting nut (60) is inserted into the front end of the end connector (30); an inner radial extension edge (51) is formed on the rear end inner wall of the connecting nut (60); the inner radial extension edge (51) is located behind the extension edge (31); and the inner diameter of the inner radial extension edge (51) is smaller than the outer diameter of the extension edge (31).

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