GIS piping system pipe fittings and GIS piping system

Abstract

The present invention relates to the field of GIS, and in particular to a piping joint for a GIS piping system and a GIS piping system. The piping joint for a GIS piping system includes a piping flange and a piping. The flange pipe of the piping flange is provided with a step surface, and one end of the piping flange is an insertion end for inserting the piping; one end of the piping is inserted into the piping flange, and the end face of the end is matched with the step surface; at least one of the step surface and the end face is provided with a slope, and the slope forms an opening toward the center of the piping flange at the junction of the end face and the step surface. The present invention enlarges the places where the piping joints would originally form fine gaps. Compared with the fine gaps in the prior art, it is more unfavorable for impurities to stay. Even if some impurities fall on the above-mentioned matching places, they are easier to be observed and found, and cannot be hidden, and can be cleaned up in time. In summary, the present invention solves the problem that foreign matter is easily mixed in the existing piping system joints.

Description

Technical Field

[0001] The invention relates to the field of GIS, and in particular to a piping joint for a GIS piping system and a piping system for a GIS. Background Art

[0002] The structure of GIS (Gas insulated metal-enclosed switchgear) piping system is as follows: Figure 1 As shown, it is composed of a ball valve 1, a pipe 2 and a density meter 3. The GIS pipeline system joints mainly include density meter joints and valve pipe joints.

[0003] The piping 2 used for GIS is mainly divided into copper piping and stainless steel piping according to the piping material. The stainless steel piping is welded by a stainless steel pipe and a piping flange. Specifically, a step surface is set on the inner wall of the flange pipe of the piping flange, and the stainless steel pipe is inserted into the piping flange. The end face is fitted with the step surface on the inner wall of the piping flange, and then the stainless steel pipe is welded to the piping flange at the end of the flange pipe. Under ideal conditions, the end face of the stainless steel pipe is fitted with the step surface on the inner wall of the piping flange to position and prevent the inclusion of foreign matter. However, in actual operation, there is often a problem of a gap between the end face of the stainless steel pipe and the step surface, or the phenomenon of foreign matter being included, resulting in foreign matter entering the GIS air chamber when the GIS is inflated, causing hidden dangers.

[0004] In addition, GIS valves are mainly divided into two categories: bellows combination valves and ball valves. A ball valve is a valve whose ball is driven by a valve stem and rotates around the axis of the ball valve. It is mainly used to cut off, distribute and change the flow direction of fluids in GIS pipelines. The fluid used by GIS ball valves is SF 6 Gas is mainly used to fill and discharge the GIS air chamber and carry the density meter. The joints of the GIS ball valve include the density meter joint for the density meter and the filling and discharging (SF 6 In the prior art, the head of the density meter is directly installed on the density meter joint through threads. When installed in place, the direction of the dial is certain. This leads to the problem that the dial of the ratio meter does not face the observer in some occasions after installation, which brings inconvenience to the reading of the density meter. Summary of the invention

[0005] The object of the present invention is to provide a pipe system pipe joint for GIS to solve the problem that foreign matter is easily mixed in the existing pipe system joint.

[0006] At the same time, the present invention also aims to provide a GIS piping system using the above-mentioned connector to reduce the risk of foreign matter entering the air chamber when the GIS is inflated.

[0007] In order to achieve the above-mentioned purpose, the GIS piping system pipe fitting of the present invention adopts the following technical scheme: The GIS piping system pipe fitting comprises:

[0008] A piping flange, wherein a step surface is provided inside the flange pipe of the piping flange, and one end of the piping flange is an insertion end for inserting the piping;

[0009] A pipe has one end inserted into the pipe flange, and the end face of the end is engaged with the step face; at least one of the step face and the end face is provided with a slope, and the slope forms an opening toward the center of the pipe flange at the junction of the end face and the step face.

[0010] Beneficial effect: The GIS piping system piping joint of the present invention sets at least one of the step surface in the piping flange and the end surface of one end of the piping inserted into the piping flange as a slope surface, and the slope surface forms an opening toward the center of the piping flange at the junction of the end surface and the step surface, thereby reducing the contact area between the two and the probability of impurities being included on the one hand, and enlarging the place where small gaps would have been formed on the other hand. Compared with the small gaps in the prior art, it is more unfavorable for impurities to stay. Even if some impurities fall on the above-mentioned matching place, they are easier to be observed and found, cannot be hidden, and can be cleaned up in time. In summary, the present invention solves the problem that foreign matter is easily included in the existing piping system joints.

[0011] Furthermore, the contact between the end face and the step surface is a line contact, which minimizes the contact area between the end face and the step surface, thereby further avoiding the inclusion of impurities between the two.

[0012] Furthermore, the opening is a V-shaped opening. The V-shaped opening forms a symmetrical structure of the opening, that is, the lower side also forms a slope surface, which is conducive to the slipping of impurities.

[0013] Furthermore, the step surface is located at an end of the pipe flange away from the insertion end. The step surface is located at an end of the pipe flange away from the insertion end, which is more conducive to observation.

[0014] Furthermore, the distance between the step surface and an end of the pipe flange away from the insertion end is 1-5 mm.

[0015] Furthermore, the distance between the step surface and an end of the pipe flange away from the insertion end is 2 mm.

[0016] Furthermore, the pipe is a stainless steel pipe.

[0017] The GIS piping system adopts the following technical solutions: The GIS piping system includes:

[0018] A ball valve, wherein the ball valve is provided with a pipe joint and a density meter joint, wherein the pipe joint comprises:

[0019] A piping flange, wherein a step surface is provided inside the flange pipe of the piping flange, and one end of the piping flange is an insertion end for inserting the piping;

[0020] A pipe has one end inserted into the pipe flange, and the end face of the end is engaged with the step face; at least one of the step face and the end face is provided with a slope, and the slope forms an opening toward the center of the pipe flange at the junction of the end face and the step face.

[0021] The pipe fitting of the GIS pipe system of the present invention sets at least one of the step surface in the pipe flange and the end surface of one end of the pipe inserted into the pipe flange as a slope surface, and the slope surface forms an opening toward the center of the pipe flange at the junction of the end surface and the step surface, thereby reducing the contact area between the two and the probability of impurities being mixed, and on the other hand, enlarging the place where a small gap would have been formed, which is more unfavorable for impurities to stay than the small gap in the prior art. Even if some impurities fall on the above-mentioned matching place, they are easier to be observed and found, cannot be hidden, and can be cleaned up in time. The problem of foreign matter being easily mixed in the existing pipe system joints is solved, thereby reducing the risk of foreign matter entering the air chamber when the GIS is inflated.

[0022] Furthermore, the contact between the end surface and the step surface is line contact.

[0023] Furthermore, the opening is a V-shaped opening.

[0024] Furthermore, the step surface is located at an end of the pipe flange away from the insertion end.

[0025] Furthermore, the distance between the step surface and an end of the pipe flange away from the insertion end is 1-5 mm.

[0026] Furthermore, the distance between the step surface and an end of the pipe flange away from the insertion end is 2 mm.

[0027] Furthermore, the pipe is a stainless steel pipe.

[0028] Furthermore, the density meter joint includes an adapter and a threaded cap, the outer contour of the adapter is a stepped shaft shape, the end face of the large diameter section forms a sealing surface for crimping and sealing with the head of the density meter, the threaded cap can be rotatably sleeved on the small diameter section of the adapter, and cooperate with the large diameter section of the adapter to prevent disengagement, and the screw hole of the threaded cap is used to cooperate with the head thread of the density meter. The density meter joint using the threaded cap combined with the adapter can be locked and sealed by tightening the threaded cap after the direction of the density meter head is determined, thereby realizing 360° installation of the density meter head.

[0029] Furthermore, a top screw is arranged on the wall of the threaded cap, and the top screw can further prevent the cap from loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the GIS piping system;

[0031] Figure 2 It is a structural schematic diagram of a pipe fitting for a GIS pipe system of the present invention;

[0032] Figure 3 It is a structural schematic diagram of a ball valve in a GIS piping system of the present invention;

[0033] Figure 4 It is a structural diagram of the density meter joint.

[0034] In the figure: 1. ball valve; 2. piping; 3. density meter; 4. valve body; 5. density meter joint; 6. piping joint; 7. threaded cap; 8. adapter; 9. ball valve support; 10. top screw; 11. stainless steel pipe; 111. end face; 12. piping flange; 121. flange pipe; 122. flange plate; 1211. step surface. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0037] It should be noted that the relational terms such as "first" and "second" that may appear in the specific embodiments of the present invention are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variants thereof that may appear are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements that are inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "includes a ..." that may appear do not exclude the existence of other identical elements in the process, method, article or device that includes the elements.

[0038] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" that may appear should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the description of the present invention, unless otherwise clearly specified and limited, the term "provided with" that may appear should be understood in a broad sense. For example, the object "provided with" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or an inseparable connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The present invention is further described in detail below in conjunction with embodiments.

[0041] The embodiments of the GIS piping system pipe joint of the present invention are as follows:

[0042] like Figure 2 As shown, the GIS piping system joint includes a pipe flange 12 and a pipe.

[0043] The pipe flange 12 includes a flange pipe 121 and a flange plate 122. The end of the flange pipe 121 away from the flange plate 122 constitutes an insertion end for inserting the pipe. A step surface 1211 is provided on the inner wall of the flange pipe 121. The step surface 1211 is located at the end of the flange pipe 121 away from the insertion end, that is, the end close to the flange plate 122. In actual production, when designing the distance between the step surface 1211 and the outer side surface of the flange plate 122 (the side surface away from the flange pipe), the principle is that the human eye can observe the step surface from this end. According to the general diameter of the flange pipe in the pipe joint of the GIS pipeline system, the distance can be specifically set to 1-5 mm. In this embodiment, it is specifically 2 mm.

[0044] The step surface 1211 adopts a slope design, and the diameter of the edge on one side close to the insertion end of the flange pipe 121 is larger than the diameter of the other side. Figure 2 From an azimuthal perspective, that is, the inner diameter of the upper end is greater than the inner diameter of the lower end. In this embodiment, the slope surface is an inverted cone surface as a whole. During welding, a slope can be formed to prevent impurities (debris, etc.) from falling on and staying.

[0045] The pipe is a stainless steel pipe 11, one end of which is inserted into the flange pipe 121 from the insertion end of the flange pipe 121. For ease of description, the end of the pipe inserted into the flange pipe 121 is referred to as the plug-in end. In this embodiment, the end face 111 of the plug-in end also adopts a slope structure, which makes the plug-in end of the pipe form an expanded opening. The slope here is also a conical surface. In this embodiment, the end face of the plug-in end is a conical surface as a whole.

[0046] After the insertion end of the stainless steel pipe 11 is inserted into the pipe flange 12, the plug-in end and the step surface 1211 are stopped and matched, and a line contact is formed between the two, thereby reducing the contact area and avoiding the inclusion of foreign matter at the contact point between the two. In addition, the shape of the step surface 1211 and the shape of the end surface 111 of the plug-in end form a V-shaped opening at the adjacent part of the two (such as Figure 2 As shown at A in the figure, the opening is equivalent to enlarging the gap here in the prior art, thereby preventing the hiding of impurities. That is, in the prior art, the art hopes to eliminate the gap as much as possible through the contact between the plane of the plug-in end and the plane of the step surface, thereby preventing the hiding of impurities. In the present invention, the problem of impurity hiding is solved by enlarging the gap and leaving no place for impurities to hide. Since the opening is still located at the end of the pipe flange 12, before and after welding, it is also possible to check whether there are impurities by visual observation, etc., completely eliminating the problem of impurity hiding.

[0047] In the above embodiment, the end face 111 of the plug-in end of the stainless steel pipe 11 and the step surface on the inner wall of the pipe flange 12 are both set as sloped surfaces as a whole. In other embodiments, one of the two can be set as a sloped surface. In this case, it is also possible to facilitate the exposure of impurities; or both can be set as partial slopes. In this case, the contact area between the two is also reduced, reducing the risk of inclusion of foreign matter; the slope can also be a curved surface, etc., which will not be elaborated here.

[0048] The embodiments of the GIS pipeline system of the present invention are as follows:

[0049] like Figure 2-4 As shown, the GIS piping system includes a ball valve, which includes a valve body 4 and is provided with a pipe joint 6 and a density meter joint 5.

[0050] The structure of the pipe joint 6 is as follows Figure 2 As shown, the structure is the same as that of the above-mentioned embodiment of the GIS piping system pipe fitting of the present invention, and will not be described in detail here.

[0051] The structure of the density meter connector 5 is as follows Figure 3-4 As shown, it includes an adapter 8 and a threaded hood 7. The adapter 8 is fixedly mounted on a ball valve support 9 provided on a valve body 4. The outer contour is in the shape of a stepped shaft. The end face of its large diameter section forms a sealing surface for crimping and sealing with the head of a density meter. A sealing ring groove is provided on the sealing surface for installing an interface sealing ring. The threaded hood 7 can be rotatably sleeved on the small diameter section of the adapter and can be anti-detachedly matched with the large diameter section of the adapter 8. The screw hole of the threaded hood 7 is used to match with the head thread of the density meter. A top screw 10 is also provided on the wall of the threaded hood.

[0052] When installing the head of the density meter, first adjust the head of the density meter to the required direction, maintain its direction through tooling or manual work, and then screw the threaded hood. The threaded hood and the density meter are fixed on the adapter, so that the head of the density meter can be installed 360° at will.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. Pipeline system for GIS, including: The ball valve is equipped with a pipe joint and a density meter joint. The pipe joint includes a pipe flange and a pipe. The flange pipe of the pipe flange is provided with a step surface. One end of the pipe flange is an insertion end for inserting the pipe. One end of the pipe is inserted into the pipe flange, and the end face of the end is matched with the step surface for stopping. The invention is characterized in that both the step surface and the end surface are provided with a slope surface, which can form a slope during welding to prevent impurities from falling on and staying there, and the slope surface is an arc surface, which forms a V-shaped opening toward the center of the pipe flange at the junction of the end surface and the step surface; The density meter joint includes an adapter and a threaded hood. The outer contour of the adapter is a stepped shaft shape, and the end face of its large diameter section forms a sealing surface for crimping and sealing with the head of the density meter. The threaded hood can be rotatably sleeved on the small diameter section of the adapter and cooperate with the large diameter section of the adapter to prevent it from falling off. The screw hole of the threaded hood is used to cooperate with the head thread of the density meter, and a top screw is provided on the wall of the threaded hood.

2. The GIS pipeline system according to claim 1, characterized in that: The contact between the end surface and the step surface is line contact.

3. The GIS pipeline system according to claim 1 or 2, characterized in that: The step surface is located at an end of the pipe flange that is away from the insertion end.

4. The GIS pipeline system according to claim 3, characterized in that: The distance between the step surface and the end of the pipe flange away from the insertion end is 1-5 mm.

5. The GIS pipeline system according to claim 4, characterized in that: The distance between the step surface and the end of the pipe flange away from the insertion end is 2 mm.

6. The GIS pipeline system according to claim 1 or 2, characterized in that: The pipes are stainless steel pipes.

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