Gas pipe elbow assembly and gas pipe

Abstract

The invention provides a gas pipe elbow assembly and a gas pipe, relates to the field of gas pipes, and aims to solve the problems of inconvenient connection and poor sealing effect between a copper elbow and a stainless steel corrugated pipe as well as between the copper elbow and a connecting nut in the prior art through screw-thread fit between a welding head and the elbow, screw-thread fit between a connecting pipe and the elbow and filling of a sealant. The problem that a copper elbow and a stainless steel corrugated pipe are inconvenient to weld is solved, the connecting strength and the sealing performance are improved, the problem that the sealing effect between the copper elbow and a connecting nut is poor is solved through matching of a stepped hole and a protruding part between the connecting pipe and the nut, the sealing effect is enhanced, and the risk of leakage is reduced. The connector is suitable for a high-temperature working environment, the corrosion problem of the connector position is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The invention relates to the field of gas pipes, and in particular to a gas pipe elbow assembly and a gas pipe. Background Art

[0002] When installing the gas hose, it needs to be installed from the bottom to the stove. The direct head of the hose is not convenient to install with the stove. The use of a direct head installation connection will form installation stress. After the gas stove is used for a long time, the hose near the direct head is prone to local interference and breakage.

[0003] A Chinese patent (publication number CN207261861U) discloses a metal bellows with an elbow, which adopts the arrangement of a stainless steel bellows and a stainless steel elbow to avoid extreme bending of the root of the bellows, and arranges a second gasket and an anti-drop clamp to enhance the sealing effect at the interface of the bellows. The elbow and the second connecting pipe, and the elbow and the bellows are welded. For the elbow made of copper and the second connecting pipe, the connection strength and sealing can be ensured by welding. In order to withstand the high temperature working environment at the gas pipe joint and reduce the rust problem at the joint, the elbow is often made of copper. It is inconvenient to weld the copper elbow and the stainless steel bellows, and the copper elbow and the connecting nut. Conventional plug-in matching methods are used, and the sealing failure and leakage are prone to occur over time. Summary of the invention

[0004] The purpose of the present invention is to provide a gas pipe elbow assembly and a gas pipe in view of the defects of the prior art. The problem of inconvenient welding between the copper elbow and the stainless steel bellows is solved by the thread matching of the welding head and the elbow, the thread matching of the connecting pipe and the elbow, and the filling of the sealant, and the connection strength and sealing are improved. The matching of the stepped hole and the raised part between the connecting pipe and the nut solves the problem of poor sealing effect between the copper elbow and the connecting nut, enhances the sealing effect, and reduces the risk of leakage. It is suitable for high temperature working environment, reduces the rust problem at the joint position, and prolongs the service life.

[0005] The first object of the present invention is to provide a gas pipe elbow assembly, which adopts the following scheme:

[0006] It includes an elbow and a nut, a channel is formed inside the elbow, and threaded holes are formed at the openings at both ends of the elbow respectively. The opening thread at one end of the elbow is matched with a welding head, and the opening thread at the other end is matched with a connecting pipe. The thread matching position is filled with sealant, and the internal passage of the welding head is connected to the connecting pipe through the elbow; a stepped hole is formed in the nut, and the end of the connecting pipe away from the elbow is inserted into the stepped hole and extends radially to form a protrusion, which abuts against the stepped annular surface of the stepped hole.

[0007] Furthermore, the welding head and the connecting pipe are respectively provided with external threads, and the external threads cooperate with the threaded holes formed by the opening of the elbow end.

[0008] Furthermore, the threaded hole on the elbow forms a stepped hole structure with the channel, the threaded hole has a diameter larger than the channel diameter, and an annular table is formed at one end of the threaded hole close to the channel.

[0009] Furthermore, a gasket is filled between the end face of one end of the welding head with the external thread and the annular table surface inside the threaded hole, and a gasket is filled between the end face of one end of the connecting pipe with the external thread and the annular table surface inside the threaded hole.

[0010] Furthermore, the axes corresponding to the openings at both ends of the elbow are perpendicular to each other.

[0011] Furthermore, the protrusion is an annular protrusion distributed circumferentially around the connecting pipe, and one end of the connecting pipe passes through the small diameter section of the stepped hole and then extends into the large diameter section of the stepped hole.

[0012] Furthermore, the connecting pipe is clearance-matched with the small diameter section of the stepped hole, the inner wall of the large diameter section of the stepped hole is provided with an internal thread, and the end of the annular protrusion away from the elbow is abutted with a sealing ring.

[0013] The second object of the present invention is to provide a gas pipe with a gas pipe elbow assembly, using the gas pipe elbow assembly as described in the first object.

[0014] Furthermore, it also includes a bellows, and a welding head is welded to one end of the bellows, so that the bellows is connected to the welding head, the elbow and the connecting pipe in sequence.

[0015] Furthermore, a straight joint is installed at one end of the bellows away from the welding joint.

[0016] Compared with the prior art, the present invention has the following advantages and positive effects:

[0017] Aiming at the inconvenient connection and poor sealing effect between copper elbow and stainless steel bellows, copper elbow and connecting nut, the problem of inconvenient welding between copper elbow and stainless steel bellows is solved by matching the thread of welding head and elbow, matching the thread of connecting pipe and elbow and filling with sealant, which improves the connection strength and sealing performance. The matching of stepped hole and raised part between connecting pipe and nut solves the problem of poor sealing effect between copper elbow and connecting nut, enhances the sealing effect and reduces the risk of leakage. It is suitable for high temperature working environment, reduces the rust problem at the joint position and prolongs the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0019] Figure 1 It is a schematic diagram of the gas pipe elbow assembly installed on the gas pipe in Examples 1 and 2 of the present invention.

[0020] Figure 2 It is a cross-sectional schematic diagram of the gas pipe elbow assembly in Examples 1 and 2 of the present invention.

[0021] Figure 3 It is a schematic diagram of the structure of the gas pipe elbow assembly in Examples 1 and 2 of the present invention.

[0022] Among them, 1. nut; 2. connecting pipe; 3. butt end; 4. gasket; 5. sealant; 6. elbow; 7. welding head; 8. bellows; 9. straight head. DETAILED DESCRIPTION

[0023] Example 1

[0024] In a typical embodiment of the present invention, Figure 1-Figure 3 As shown, a gas pipe elbow assembly is provided.

[0025] The connection between the copper elbow 6 and the stainless steel bellows 8 and between the copper elbow 6 and the connecting nut 1 adopts conventional plug-in matching, which may cause leakage due to sealing failure. Especially in a working environment with a high temperature at the gas pipe joint, the rust problem at the joint will be more obvious, affecting the connection strength and sealing. Based on this, this embodiment provides a new type of gas pipe elbow assembly to improve the stability and sealing of the connection.

[0026] like Figure 1As shown, the gas pipe elbow assembly includes an elbow 6 and a nut 1, and docking elements are connected to the two ends of the elbow 6 respectively to achieve the connection between the elbow 6 and the nut 1 and the connection between the elbow 6 and the bellows 8. The elbow 6 is a two-way bend with a channel formed inside. The openings at both ends of the elbow 6 are respectively provided with threads to form threaded holes. The end of the elbow 6 serves as a docking end 3 to facilitate the cooperation with the docking element. In this embodiment, one docking end 3 of the elbow 6 is threadedly cooperated with a welding head 7, which can be connected to the bellows 8 through the welding head 7, and the other docking end 3 of the elbow 6 is threadedly cooperated with a connecting pipe 2, which can establish the connection between the elbow 6 and the nut 1. The threaded cooperation position is filled with sealant 5, and the internal passage of the welding head 7 is connected to the connecting pipe 2 through the elbow 6. A stepped hole is formed in the nut 1, and one end of the connecting pipe 2 away from the elbow 6 penetrates into the stepped hole and extends radially to form a protrusion, which abuts against the stepped annular surface of the stepped hole, so that a certain range of movable space can be formed between the connecting pipe 2 and the elbow 6, and a stable abutment effect can be maintained, which is convenient for connecting to the external gas stove joint position to form a crimping seal.

[0027] Specifically, Figure 2 As shown, a channel is formed inside the elbow 6 for the circulation of gas. The openings at both ends of the elbow 6 form threaded holes respectively, which are convenient for connection with other components. The opening thread at one end of the elbow 6 is matched with a welding head 7 for connection with a stainless steel bellows 8 or other components that need to be welded. Through welding, the connection strength and sealing can be ensured. The opening thread at the other end of the elbow 6 is matched with a connecting pipe 2 for connection with the nut 1. This makes the connection between the elbow 6 and the connecting pipe 2 more stable, and also facilitates installation and disassembly.

[0028] The threaded mating position is filled with sealant 5 to enhance the sealing effect and prevent gas leakage. A stepped hole is formed in the nut 1 to accommodate the connecting pipe 2. The design of the stepped hole allows the connecting pipe 2 to be firmly positioned therein. The end of the connecting pipe 2 away from the elbow 6 is inserted into the stepped hole and extends radially to form a raised portion, which abuts against the stepped annular surface of the stepped hole. This not only increases the stability of the connection, but also enhances the sealing effect through the close contact between the raised portion and the stepped annular surface.

[0029] Through the threaded matching and welding of the welding head 7 and the elbow 6, the problem of inconvenient welding between the copper elbow 6 and the stainless steel bellows 8 is solved, and the connection strength and sealing are improved. Through the threaded matching of the connecting pipe 2 and the elbow 6 and the filling of the sealant 5, as well as the matching of the stepped hole and the raised part between the connecting pipe 2 and the nut 1, the problem of poor sealing effect between the copper elbow 6 and the connecting nut 1 is solved, the sealing effect is enhanced, and the risk of leakage is reduced. It is suitable for high-temperature working environments, reduces the rust problem at the joint position, and prolongs the service life.

[0030] like Figure 1 and Figure 2 As shown, the welding head 7 and the connecting pipe 2 are respectively provided with external threads, which cooperate with the threaded hole formed by the opening at the end of the elbow 6. It is ensured that the welding head 7 and the connecting pipe 2 can be firmly connected to the elbow 6 and are not easy to loosen.

[0031] The threaded hole on the elbow 6 forms a stepped hole structure with the channel, and the threaded hole diameter is larger than the channel diameter. This allows the threaded hole to accommodate the external threads of the welding head 7 and the connecting pipe 2, and provides additional space for filling sealing materials such as the gasket 4. The threaded hole forms an annular table near one end of the channel, which provides a planar support for the placement of the gasket 4, ensuring the stability and sealing effect of the gasket 4.

[0032] A gasket 4 is filled between the end face of the welding head 7 with the external thread and the annular table surface in the threaded hole. Similarly, a gasket 4 is also filled between the end face of the connecting pipe 2 with the external thread and the annular table surface in the threaded hole. The filling of the gasket 4 enhances the sealing of the connection and prevents gas leakage.

[0033] Gasket 4 enhances the sealing of the connection in the gas pipe elbow assembly and effectively prevents gas leakage. When installing gasket 4:

[0034] First, it is necessary to ensure that the welding head 7, the connecting pipe 2, the threaded hole of the elbow 6 and other components have been cleaned and are free of oil, impurities, etc., so as to ensure that the gasket 4 can fit tightly and achieve the best sealing effect.

[0035] According to the specific application scenario and the material, pressure and other parameters of the gas pipeline, select the appropriate gasket 4 material and specification. Common gasket 4 materials include rubber, metal, graphite, etc. Each material has its own unique performance and application range.

[0036] The selected gasket 4 is placed between the end face of the welding head 7 or the connecting pipe 2 with the external thread and the annular table surface in the threaded hole. The gasket 4 should be flat and free of distortion to ensure that it can be evenly stressed and achieve the best sealing effect.

[0037] After the gasket 4 is placed, the welding head 7, the connecting pipe 2 and the elbow 6 are tightly connected together through threaded connection. During the tightening process, it is necessary to control the tightening force to avoid excessive tightening that causes damage to the gasket 4 or deformation of the connecting parts.

[0038] In addition, the selection of gasket 4 needs to be comprehensively considered according to the specific application scenario and the material, pressure and other parameters of the gas pipeline. Select the appropriate material of gasket 4 according to the material of the gas pipeline and the working environment temperature. For example, for high temperature environment, you can choose a high temperature resistant gasket 4 material; for corrosive environment, you can choose a corrosion resistant gasket 4 material. According to the working pressure of the gas pipeline, select the appropriate gasket 4 pressure level. The pressure level of gasket 4 should be higher than or equal to the working pressure of the gas pipeline to ensure that it can withstand the pressure in the pipeline without leakage. The sealing performance of gasket 4 is one of the key indicators of selection. Choose a gasket 4 with good sealing performance to ensure that it can effectively prevent gas leakage. The size of gasket 4 should match the size of the threaded hole of the connecting component to ensure that it can be correctly placed in the threaded hole and achieve the best sealing effect.

[0039] After the gasket 4 is installed, the flow process of the gas in the pipeline is as follows:

[0040] Gas entry: Gas enters from the upstream end of the pipeline and passes through the connection between the welding joint 7 or the connecting pipe 2 and the elbow 6.

[0041] Sealing function: The gasket 4 plays a sealing role at the connection part. It fits tightly between the connection parts to prevent the gas from leaking out from the connection gap.

[0042] Gas transmission: After the gasket 4 is sealed, the gas continues to be transmitted along the pipeline to the downstream end. During the transmission process, the gas will maintain a certain pressure and flow rate to meet the use requirements of the gas equipment.

[0043] In order to ensure the safe transmission of gas, some safety monitoring equipment (such as pressure gauges, flow meters, etc.) are usually set up to monitor the gas pressure and flow rate in the pipeline in real time. Once an abnormal situation is found, measures can be taken immediately to avoid accidents.

[0044] The axes corresponding to the openings at both ends of the elbow 6 are perpendicular to each other, so that the elbow 6 can change the flow direction of the gas, which is suitable for occasions where the direction of the pipeline needs to be changed.

[0045] like Figure 2 As shown, the raised portion is an annular raised portion distributed circumferentially around the connection pipe 2, so that the raised portion can be in close contact with the stepped annular surface of the stepped hole. When the nut 1 is matched with the external gas stove, the abutment effect of the raised portion and the stepped annular surface can be used to achieve compression, thereby ensuring the sealing effect between the connection pipe 2 and the gas stove joint. One end of the connection pipe 2 passes through the small diameter section of the stepped hole and then extends into the large diameter section of the stepped hole, so that the connection pipe 2 can be firmly positioned in the stepped hole and is convenient for connection with the nut 1.

[0046] The clearance fit between the connecting pipe 2 and the small diameter section of the stepped hole allows the connecting pipe 2 to easily pass through the small diameter section and be positioned in the large diameter section. The clearance fit allows the connecting pipe 2 and the stepped hole to be movably adjusted, and as the nut 1 is tightened, it is ensured that the connecting pipe 2 can be stably connected to the external gas stove connector.

[0047] The inner wall of the large diameter section of the stepped hole is provided with an internal thread for connecting with the nut 1. The end of the annular protrusion away from the elbow 6 is abutted with a sealing ring, which is located between the annular protrusion of the connecting pipe 2 and the external gas stove joint. The nut 1 is tightened to achieve an extrusion effect, which further enhances the sealing of the connection and prevents gas leakage.

[0048] The external thread design of the welding head 7 and the connecting pipe 2, as well as the stepped hole structure of the elbow 6, solves the problem of stability and sealing between the connecting parts. The filling of the gasket 4 further enhances the sealing effect of the connection to prevent gas leakage. Figure 3 As shown, the axial relationship of the openings at both ends of the elbow 6 realizes the change of the gas flow direction, which is suitable for the needs of different occasions. The annular design of the raised part and the matching of the connecting pipe 2 and the stepped hole, as well as the use of the sealing ring, further improve the stability and sealing of the connection.

[0049] Example 2

[0050] In another typical embodiment of the present invention, Figure 1-Figure 3 As shown, a gas pipe with a gas pipe elbow assembly is provided, using the gas pipe elbow assembly as in Example 1.

[0051] A gas pipe with a gas pipe elbow assembly comprises a bellows 8, a straight joint 9 and a gas pipe elbow assembly as in Example 1. The gas pipe elbow assembly comprises components such as a welding joint 7, an elbow 6 and a connecting pipe 2 to achieve a stable and sealed connection. The bellows 8 is a tubular structure with a corrugated shape, one end of which is welded to the welding joint 7. The design of the bellows 8 makes it have certain flexibility and elasticity, and can adapt to certain bending and vibration, thereby enhancing the adaptability and durability of the entire gas pipe. A straight joint 9 is installed at one end of the bellows 8 away from the welding joint 7. The straight joint 9 is a component used to connect pipes, which allows the bellows 8 to be directly connected to other pipes or equipment, thereby achieving smooth transmission of gas.

[0052] By adopting the gas pipe elbow assembly as in Example 1, the stability and sealing problems between the connecting parts are solved. The welding head 7, elbow 6 and connecting pipe 2 in the gas pipe elbow assembly are connected stably and sealed through a specific connection method (such as threaded connection, gasket 4 sealing, etc.), reducing the risk of leakage. In addition, the introduction of the bellows 8 enhances the adaptability and durability of the entire gas pipe. The bellows 8 has a certain flexibility and elasticity, and can adapt to certain bending and vibration, thereby reducing the risk of leakage or damage caused by pipeline deformation or vibration.

[0053] The installation of the direct connector 9 enables the bellows 8 to be directly connected to other pipelines or equipment, thus achieving connection flexibility and meeting gas transmission requirements in different occasions.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gas pipe elbow assembly, characterized in that: It includes an elbow and a nut, a channel is formed inside the elbow, and threaded holes are formed at the openings at both ends of the elbow respectively. The opening thread at one end of the elbow is matched with a welding head, and the opening thread at the other end is matched with a connecting pipe. The thread matching position is filled with sealant, and the internal passage of the welding head is connected to the connecting pipe through the elbow; a stepped hole is formed in the nut, and the end of the connecting pipe away from the elbow is inserted into the stepped hole and extends radially to form a protrusion, which abuts against the stepped annular surface of the stepped hole.

2. The gas pipe elbow assembly according to claim 1, characterized in that: The welding head and the connecting pipe are respectively provided with external threads, which are matched with the threaded holes formed by the opening of the elbow end.

3. The gas pipe elbow assembly according to claim 2, characterized in that: The threaded hole on the elbow forms a stepped hole structure with the channel, the threaded hole has a diameter larger than the channel diameter, and an annular table is formed at one end of the threaded hole close to the channel.

4. The gas pipe elbow assembly according to claim 3, characterized in that: A gasket is filled between the end face of one end of the welding head with external threads and the annular table surface inside the threaded hole, and a gasket is filled between the end face of one end of the connecting pipe with external threads and the annular table surface inside the threaded hole.

5. The gas pipe elbow assembly according to claim 1, characterized in that: The axes corresponding to the openings at both ends of the elbow are perpendicular to each other.

6. The gas pipe elbow assembly according to claim 1, characterized in that: The protrusion is an annular protrusion distributed circumferentially around the connecting pipe. One end of the connecting pipe passes through the small diameter section of the stepped hole and then extends into the large diameter section of the stepped hole.

7. The gas pipe elbow assembly according to claim 6, characterized in that: The connecting pipe is clearance-matched with the small diameter section of the stepped hole, the inner wall of the large diameter section of the stepped hole is provided with an internal thread, and the end of the annular protrusion away from the elbow is abutted with a sealing ring.

8. A gas pipe with a gas pipe elbow assembly, characterized in that: Utilize the gas pipe elbow assembly as described in any one of claims 1-7.

9. The gas pipe with a gas pipe elbow assembly according to claim 8, characterized in that: It also includes a bellows, a welding head is welded to one end of the bellows, so that the bellows is connected with the welding head, the elbow and the connecting pipe in sequence.

10. The gas pipe with a gas pipe elbow assembly according to claim 9, characterized in that: A straight joint is installed at one end of the bellows away from the welding joint.

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