A high pressure air duct

Abstract

This utility model discloses a high-pressure air duct and belongs to the field of fluid equipment technology. The high-pressure air duct of this utility model includes a cylinder connected to a compressor housing and a connecting plate for connecting to a pipeline. The cylinder is a hollow column with a cavity running through its upper and lower parts for fluid passage. One end of the cylinder has a first fixing part that connects to the connecting plate. The connecting plate has a through hole running through its upper and lower parts for fluid passage, and a second fixing part that mates with the first fixing part is disposed within the through hole. The first and second fixing parts are connected by a connecting structure. After the cylinder is fixed to the connecting plate, a flange is machined on the connecting plate corresponding to the pipeline specifications. The shape and dimensions of the cylinder are adapted to the specifications and dimensions of the compressor. The air duct of the compressor in a compressed air energy storage system can use the high-pressure air duct provided by this utility model, which has the advantage of high material utilization.

Description

Technical Field

[0001] This utility model relates to the field of fluid equipment technology, and in particular to a high-pressure air duct. Background Technology

[0002] High-pressure ducts are commonly used at the inlet and outlet of fluid equipment. In this field, medium-pressure and high-pressure ducts are generally referred to collectively as high-pressure ducts to distinguish them from low-pressure ducts. Taking compressors as an example, the inlet and outlet ducts of compressors can withstand inlet and outlet pressures of tens of megapascals or higher; therefore, the high-pressure ducts used at the inlet and outlet of compressors have relatively thick walls.

[0003] The manufacture of high-pressure ventilation ducts has always been a technical challenge in this field. Because high-pressure ventilation ducts are used at high pressure levels, high-strength materials are commonly used, and a one-piece molding method is employed to ensure their strength. In this field, high-pressure ventilation ducts are typically made of steel, and common one-piece molding methods include casting and forging.

[0004] In the process of developing this utility model, the inventors discovered at least the following problems in the prior art: cast high-pressure air ducts are prone to defects and their performance is inferior to that of forged air ducts. However, forged high-pressure air ducts suffer from low material utilization, typically below 50%, resulting in significant waste and keeping the manufacturing cost of high-pressure air ducts consistently high. Summary of the Invention

[0005] The purpose of this invention is to provide a high-pressure air duct with high material utilization.

[0006] To achieve this objective, a high-pressure air duct is provided, comprising a cylinder connected to a compressor housing and a connecting plate for connecting to a pipeline; the cylinder is a hollow column with a cavity extending through the top and bottom of the cylinder for fluid passage, and a first fixing part connected to the connecting plate at one end of the cylinder; the connecting plate has a through hole extending through the top and bottom of the plate for fluid passage, and a second fixing part is provided in the through hole to cooperate with and connect the first fixing part, the first fixing part and the second fixing part being connected by a connecting structure; the first fixing part of the cylinder has a bevel for welding the cylinder and the connecting plate together, thereby fixing the cylinder and the connecting plate together.

[0007] Furthermore, a first bevel is provided on the end face of the cylinder between the first fixing part of the cylinder and the outer wall of the cylinder, and a first weld is formed between the cylinder and the connecting plate at the first bevel, so that the cylinder and the connecting plate are fixedly connected.

[0008] Furthermore, the first bevel, viewed from the cross-section, comprises a horizontal section, a sloping section, and an arc section connected in sequence, resulting in a shallow first weld depth and free from defects.

[0009] Furthermore, viewed from the end face of the cylinder, the first bevel is an annular bevel, arranged in a ring around the end face of the cylinder, and the first bevel is arranged side by side with the first fixing part.

[0010] Furthermore, a second bevel is provided at the end of the first fixing part of the cylinder that is away from the cylinder. The second bevel is used to form a weld at the bottom end of the first fixing part of the cylinder and the bottom end of the second fixing part of the connecting plate.

[0011] Furthermore, a third bevel is provided at the bottom end of the second fixing part of the connecting plate away from the plate surface. The third bevel is used to form a weld at the bottom end of the first fixing part of the cylinder and the bottom end of the second fixing part of the connecting plate.

[0012] Furthermore, a second bevel is provided at the end of the first fixing part of the cylinder that is away from the cylinder, and a third bevel is provided at the bottom end of the second fixing part of the connecting plate that is away from the plate surface. The openings of the second bevel and the third bevel are arranged opposite to each other to form a V-shaped opening with a V-shaped cross section. The V-shaped opening is used to form a second weld to fix the cylinder and the connecting plate together.

[0013] Furthermore, the connection structure adopts a threaded connection structure.

[0014] Furthermore, the outer side wall of the first fixing part of the cylinder is provided with external threads, and the inner side wall of the second fixing part of the connecting disc is provided with internal threads. The first fixing part and the second fixing part are connected by threads.

[0015] Furthermore, both the cylinder and the connecting disc are forgings.

[0016] One of the above technical solutions has the following advantages or beneficial effects: In this embodiment of the high-pressure air duct, the high-pressure air duct is disassembled into two independent forgings: a cylinder body and a connecting disc. Since both the cylinder body and the connecting disc are regularly shaped hollow cylinders, the material utilization rate of both parts is high during forging, resulting in less material waste and lower manufacturing costs compared to directly forging a high-pressure air duct. A bevel is provided on the first fixing part of the cylinder body for welding the cylinder body and the connecting disc together, thus fixing the cylinder body and the connecting disc together and ensuring the connection strength. Therefore, the high-pressure air duct of this embodiment has the advantage of high material utilization.

[0017] Furthermore, a threaded connection is used at the joint between the cylinder and the connecting plate, which increases the connection area and strength of the two forgings.

[0018] Furthermore, two welds are processed at the connection between the cylinder and the connecting plate. The first weld is located at the connection between the cylinder and the connecting plate, and the second weld is a groove cut from both sides of the thread, which reduces the weld depth and ensures better welding quality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the high-pressure air duct in an embodiment; Figure 2 This is a structural schematic diagram of the cylindrical forging; Figure 3 This is a structural schematic diagram of the connecting disc forging; Figure 4 This is a structural diagram of the cylinder before welding after machining; Figure 5 yes Figure 4 A magnified view of a section at point A in the middle; Figure 6 This is a schematic diagram of the structure of the connecting disc before welding after processing.

[0020] In the diagram: 100 - cylinder; 110 - first fixing part; 111 - external thread; 112 - second bevel; 120 - first bevel; 121 - horizontal section; 122 - inclined section; 123 - arc section; 130 - cavity; 200 - connecting plate; 210 - second fixing part; 211 - internal thread; 212 - third bevel; 220 - through hole; 310 - first weld; 320 - second weld. Detailed Implementation

[0021] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0022] Example

[0023] like Figures 1-6 As shown, the high-pressure air duct provided in this embodiment is used to connect between the air inlet pipe and the air inlet of the compressor housing, or to connect between the air outlet pipe and the air outlet of the compressor housing. The high-pressure air duct includes a cylinder 100 fixedly connected to the compressor housing and a connecting plate 200 for connecting to the pipe.

[0024] like Figures 1-6The cylinder 100 is a hollow cylinder, and a cavity 130 is provided inside the cylinder 100 to allow fluid to pass through. The connecting plate 200 is also a hollow cylinder, and a through hole 220 is provided inside the connecting plate to allow fluid to pass through. Optionally, the shape and size of the cylinder 100 are determined according to the compressor and design requirements. In some compressors, the shape of the air duct is a hollow cone, and the air duct can also be a hollow cylinder with a curved section.

[0025] Both the cylinder 100 and the connecting disc 200 are forged from metal billets. Forged parts are known in the industry as forgings. Forgings have a dense internal structure and complete flow lines, resulting in high strength and good toughness, making them suitable for applications requiring heavy loads, impacts, and fatigue resistance. Since both the cylinder 100 and the connecting disc 200 are regularly shaped hollow cylinders, the material utilization rate of both parts is high during forging, with less material waste and lower manufacturing costs compared to directly forging high-pressure air ducts. Of course, the cylinder 100 and the connecting disc 200 can also be manufactured using other methods, such as machining with a machining center. This product is used in situations where integral molding results in lower material utilization compared to splitting the cylinder and connecting disc into separate parts, offering a significant advantage in improving material utilization.

[0026] like Figures 1-6 The cylindrical body 100 is fixedly connected to the connecting plate 200. One end of the cylindrical body 100 has a first fixing part 110 that connects to the connecting plate 200. A second fixing part 210, which mates with the first fixing part 110, is provided within the through hole 220 of the connecting plate 200. The first fixing part 110 protrudes from the end of the cylindrical body 100, and the second fixing part 210 is a recess on the connecting plate 200. The width of the first fixing part 110 of the cylindrical body 100 is smaller than the width of the cylindrical body 100, and the inner width of the second fixing part 210 of the plate is larger than the inner width of the through hole 220 of the connecting plate 200.

[0027] After the cylinder 100 and the connecting plate 200 are fixedly connected by the first fixing part 110 and the second fixing part 210, the cavity 130 of the cylinder 100 and the through hole 220 of the connecting plate 200 are connected. The height of the first fixing part 110 and the depth of the second fixing part 210 are matched, and the width of the height of the first fixing part 110 and the inner diameter of the hole of the second fixing part 210 are matched.

[0028] like Figures 1-6A first bevel 120 is provided on the end face of the cylinder 100 between the first fixing part 110 and the outer wall of the cylinder 100. Viewed from the end face of the cylinder, the first bevel 120 is an annular bevel, arranged circumferentially around the end face of the cylinder 100, and is arranged side-by-side with the first fixing part 110. After the cylinder 100 and connecting plate 200 are assembled, the first bevel 120 and the connecting plate 200, and the upper surface of the second fixing part 210, have welding areas for filling with welding rods, forming a first weld 310 between the cylinder and the connecting plate at the first bevel. Because the high-pressure air duct of this embodiment has a thick wall of cylinder 100, if the weld depth is too large, the welding quality will be difficult to guarantee. Therefore, the first bevel 120 in this embodiment is used to ensure root penetration and reduce the possibility of defects at the welding position between the cylinder 100 and the connecting plate 200.

[0029] like Figures 4-5 Optionally, the first bevel 120, in cross-section, includes a horizontal segment 121, a sloping segment 122, and an arc segment 123 connected in sequence. Numerous experiments have shown that the above-mentioned bevel shape can not only ensure root penetration and reduce the occurrence of defects at the welding position of the cylinder 100 and the connecting plate 200, but also reduce the amount of processing during welding, ensure complete penetration, and improve the welding quality between the cylinder 100 and the connecting plate 200.

[0030] The side wall of the first fixing part 110 of the cylinder 100 and the side wall of the second fixing part 210 of the connecting plate 200 are connected by a connecting structure. The connecting structure is used to fix the relative displacement of the first fixing part 110 and the second fixing part 210 in at least one direction. Preferably, as follows... Figures 4-6 The first fixing part 110 of the cylinder 100 and the second fixing part 210 of the connecting plate 200 are connected by threads. Optionally, the outer side wall of the first fixing part 110 of the cylinder 100 is provided with external threads 111, and the inner side wall of the second fixing part 210 of the connecting plate 200 is provided with internal threads 211, and the first fixing part 110 and the second fixing part 210 are connected by threads. Because the high-pressure air duct of this embodiment has the characteristic of a large wall thickness of the cylinder 100, if the cylinder 100 and the connecting plate 200 are connected by welding alone, the connection strength between the two forgings will be insufficient, causing the air duct to be unable to withstand high-pressure loads for a long time.

[0031] Optionally, the connection structure can be a spline structure, a wedge block, etc. That is, the side wall of the first fixing part 110 of the cylinder 100 and the side wall of the second fixing part 210 of the connecting disk 200 are connected by a spline, or the side wall of the first fixing part 110 of the cylinder 100 and the side wall of the second fixing part 210 of the connecting disk 200 are connected by a wedge block.

[0032] like Figures 4-6A second bevel 112 is provided at the end of the first fixing part 110 of the cylinder 100 away from the cylinder 100. The second bevel 112 is an annular bevel and extends from the outer wall of the first fixing part 110 away from the second fixing part 210. The second bevel is used to form a weld at the bottom end of the first fixing part of the cylinder and the bottom end of the second fixing part of the connecting plate. The bottom end of the first fixing part of the cylinder is the end of the first fixing part near the second fixing part of the connecting plate, and the bottom end of the second fixing part of the connecting plate is the end of the second fixing part near the through hole. After the first fixing part 110 of the cylinder 100 is connected to the second fixing part 210 of the connecting plate 200, the bottom end of the cylinder 100 at the second fixing part 210 is welded to the connecting plate 200 at the second bevel. Optionally, the projected length of the slope of the second bevel 112 on the end face is less than the wall thickness of the first fixing part 110. Optionally, the second bevel 112 is a V-shaped bevel.

[0033] like Figures 4-6 Optionally, a third bevel 212 is provided at the end of the second fixing part of the connecting plate away from the plate surface. This end, as seen in the figure, is the bottom end of the second fixing part 210 of the connecting plate 200, and also the junction of the second fixing part 210 and the through hole 220. The third bevel 212 is used to form a weld at the bottom end of the first fixing part of the cylinder and the bottom end of the second fixing part of the connecting plate 200. The third bevel 212 is an annular bevel, extending obliquely upwards from the junction of the bottom end of the second fixing part 210 and the through hole 220 towards the plate surface of the connecting plate 200. Optionally, the inner circle of the third bevel 212 connects to the through hole 220, and a horizontal annular surface is provided between the outer circle of the third bevel 212 and the inner wall of the second fixing part 210. Optionally, the third bevel 112 is a V-shaped bevel.

[0034] like Figures 4-6 Preferably, a second bevel is provided at the end of the first fixing part of the cylinder away from the cylinder body, and a third bevel is provided at the bottom end of the second fixing part of the connecting plate away from the plate surface, that is, a second bevel 112 and a third bevel 212 are provided simultaneously. The openings of the second bevel and the third bevel are arranged opposite to each other to form a V-shaped opening with a V-shaped cross-section. The V-shaped opening is used to form a second weld to fix the cylinder body and the connecting plate. That is, the first fixing part and the second fixing part together surround the welding area for filling the welding rod through the V-shaped opening.

[0035] The manufacturing process of the high-pressure air duct in this embodiment is as follows: like Figure 2 and Figure 3Two independent hollow cylindrical forgings are machined: a cylinder 100 and a connecting disc 200. A first fixing part 110 is machined at one end of the cylinder 100, and a second fixing part 210 is machined on one side of the connecting disc 200. An external thread 111 is machined on the side wall of the first fixing part 110, and a corresponding internal thread 211 is connected to the inner wall of the second fixing part 210. A first bevel 120 is machined on the cylinder 100 at the root of the first fixing part 110, and a second bevel 112 and a third bevel 212 are machined at the bottom ends of the first fixing part 110 and the second fixing part 210, respectively.

[0036] like Figure 4 and Figure 6 After the cylinder 100 and connecting plate 200 are respectively processed, the cylinder 100 and connecting plate 200 are welded together as one piece through the first fixing part 110 and the second fixing part 210. Welding is performed at the first bevel 120 using welding equipment. Then welding is performed at the second bevel 112 and the third bevel 212 using welding equipment. Figure 1 A schematic diagram of the completed high-pressure ventilation duct is shown. The welding equipment described above can utilize existing equipment and welding processes such as shielded metal arc welding, tungsten inert gas welding, and submerged arc welding.

[0037] In this embodiment, when the high-pressure air duct is used, the end of the duct body 100 away from the connecting plate 200 is welded to the inlet / outlet of the compressor, and the side of the connecting plate 200 away from the duct body 100 is connected to an external air inlet or outlet pipe. Optionally, the connecting plate is a flange. Depending on the flange type of the air inlet or outlet pipe, corresponding connection holes are machined on the connecting plate 200 for fixed connection with the flange of the air inlet or outlet pipe.

[0038] In this embodiment, the high-pressure air duct is disassembled into two independent forgings: a cylinder body 100 and a connecting disc 200. Since both the cylinder body 100 and the connecting disc 200 are regular hollow cylinders, the material utilization rate of both parts is high during forging, with less material waste and lower manufacturing cost than directly forging a high-pressure air duct.

[0039] A threaded connection is used at the junction of the cylinder 100 and the connecting disc 200, which increases the connection area and strength of the two forgings. Furthermore, two welds are machined at the junction of the cylinder 100 and the connecting disc 200. The first weld 310 is located at the junction of the cylinder 100 and the connecting disc 200, and the second weld 320 is a groove cut from both sides of the thread, reducing the weld depth and ensuring better welding quality.

[0040] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A high pressure air duct, characterized in that, Includes a cylinder that connects to the compressor housing and a connecting plate for connecting to pipes; The cylinder is a hollow column with a cavity running through the top and bottom of the cylinder for fluid to pass through. One end of the cylinder is provided with a first fixing part that connects to a connecting plate. The connecting plate is provided with a through hole running through the top and bottom of the plate for fluid to pass through. A second fixing part is provided in the through hole that cooperates with and connects to the first fixing part. The first fixing part and the second fixing part are connected by a connecting structure. The first fixing part of the cylinder is provided with a bevel for welding the cylinder and the connecting plate together, so that the cylinder and the connecting plate are fixedly connected.

2. The high pressure air duct of claim 1, wherein, A first bevel is provided on the end face of the cylinder between the first fixing part of the cylinder and the outer wall of the cylinder. The cylinder and the connecting plate form a first weld at the first bevel so that the cylinder and the connecting plate are fixedly connected.

3. The high pressure air duct of claim 2, wherein, The first bevel, viewed from the cross-section, consists of a horizontal section, a sloping section, and an arc section connected in sequence, resulting in a shallow first weld depth and free from defects.

4. The high pressure air duct of claim 2, wherein, Viewed from the end face of the cylinder, the first bevel is an annular bevel, which is arranged in a ring around the end face of the cylinder, and the first bevel is arranged side by side with the first fixing part.

5. The high pressure air duct of claim 1, wherein, A second bevel is provided at the end of the first fixed part of the cylinder that is away from the cylinder. The second bevel is used to form a weld at the bottom end of the first fixed part of the cylinder and the bottom end of the second fixed part of the connecting plate.

6. The high pressure air duct of claim 1, wherein, A third bevel is provided at the bottom end of the second fixing part of the connecting plate away from the plate surface. The third bevel is used to form a weld at the bottom end of the first fixing part of the cylinder and the bottom end of the second fixing part of the connecting plate.

7. The high pressure air duct of claim 1, wherein, A second bevel is provided at the end of the first fixing part of the cylinder that is away from the cylinder body, and a third bevel is provided at the bottom end of the second fixing part of the connecting plate that is away from the plate surface. The openings of the second bevel and the third bevel are arranged opposite to each other to form a V-shaped opening with a V-shaped cross section. The V-shaped opening is used to form a second weld to fix the cylinder body and the connecting plate together.

8. The high pressure air duct of claim 1, wherein, The connection structure adopts a threaded connection structure.

9. The high pressure air duct of claim 1, wherein, The outer side wall of the first fixing part of the cylinder is provided with external threads, and the inner side wall of the second fixing part of the connecting plate is provided with internal threads. The first fixing part and the second fixing part are connected by threads.

10. A high pressure duct according to any one of claims 1-9, characterized in that Both the cylinder and the connecting disc are forgings.

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