Outer box structure of composite cylindrical single-circuit underground gas pressure regulating box

Abstract

The present application relates to the outer box structure of a composite cylindrical single-circuit underground gas pressure regulating box, comprising a main cylinder, a secondary cylinder, an upper top plate, a lower bottom plate, and a support plate. A second air outlet is formed on one side of the lower end of the main cylinder, and a pipeline inlet is formed on the side wall. The upper top plate and the lower bottom plate are connected to the upper and lower sides of the main cylinder wall. The support plate is arranged above the second air outlet, its edge being sealed to the inner wall of the main cylinder, and a first air outlet is formed on the support plate. The upper and lower ends of the secondary cylinder wall are sealed to the upper top plate and the lower bottom plate, respectively. One side is sealed to the side of the main cylinder where the second air outlet is formed, surrounding the second air outlet, and the other side is provided with a pipeline outlet. By arranging the high-pressure chamber and the low-pressure chamber in an upper-lower structure within the main cylinder, it is only necessary to seal the support plate within the main cylinder and then seal the secondary cylinder to the main cylinder. The simple structure, reasonable layout, and easy processing can effectively reduce the difficulty of installation and processing, and the structure of the secondary cylinder can be flexibly configured.

Description

Technical Field

[0001] The present application relates to the field of gas pressure regulating equipment, and in particular to an outer box structure of a composite cylindrical single-circuit underground gas pressure regulating box. Background Art

[0002] With the development of the economy and society, gas has been widely used, and as a result, gas pressure regulating boxes, essential for gas transmission and distribution systems, have also been widely used. Aboveground pressure regulating boxes occupy a large amount of space above ground and require high safety distances. In today's urban construction land, where every inch is valuable, site selection is difficult. Therefore, underground gas pressure regulating boxes with low safety distance requirements have come into being.

[0003] A high-pressure chamber and a low-pressure chamber are generally provided in an underground gas pressure regulating box. The different settings of the high-pressure chamber and the low-pressure chamber will affect the structure and processing of the outer shell of the underground gas pressure regulating box, so it is necessary to reasonably arrange the high-pressure chamber and the low-pressure chamber. Summary of the Invention

[0004] In view of this, the present application proposes a method with reasonable layout and convenient processing and assembly.

[0005] According to one aspect of the present application, an outer box structure of a composite cylindrical single-circuit underground gas pressure regulating box is provided, comprising:

[0006] Main cylinder, auxiliary cylinder, upper top plate, lower bottom plate and support plate;

[0007] The main cylinder is hollow in structure, with a second gas outlet opening on one side of the lower end and a pipeline inlet on the side wall, suitable for connecting to a gas input pipeline;

[0008] The upper top plate cover is arranged above the main cylinder and is sealed to the upper part of the cylinder wall of the main cylinder;

[0009] The lower base plate is arranged below the main cylinder and is sealed to the lower side of the main cylinder wall;

[0010] The support plate is arranged above the second air outlet, the edge of which is sealed with the inner wall of the main cylinder, and the support plate is provided with a first air outlet;

[0011] The auxiliary cylinder body has a hollow structure, and the upper and lower ends of the auxiliary cylinder body wall are sealedly connected to the upper top plate and the lower bottom plate respectively. One side end is sealedly connected to the side of the second air outlet opened in the main cylinder body, surrounding the second air outlet, and the other side end is provided with a pipeline outlet, which is suitable for connecting to the gas output pipeline.

[0012] In one possible implementation, a pressure-bearing connecting pipe is provided above the main cylinder, and the upper plate is connected to the main cylinder through the pressure-bearing connecting pipe; wherein, the upper end of the pressure-bearing connecting pipe is sealed with the upper plate, a pressure-regulating core mounting hole is provided on the upper plate, the upper end of the pressure-bearing connecting pipe is welded and fixed to the position of the pressure-regulating core mounting hole, and the lower end matches the opening of the main cylinder, and is welded and fixed to the upper side wall of the main cylinder.

[0013] In a possible implementation, the axial height of the pressure-bearing connecting pipe is greater than the thickness of the upper top plate; and the side wall thickness of the pressure-bearing connecting pipe is greater than the side wall thickness of the upper top plate.

[0014] In a possible implementation, the cross section of the main cylinder is circular; the cross section of the auxiliary cylinder is circular;

[0015] The diameter of the main cylinder is greater than the diameter of the secondary cylinder.

[0016] In a possible implementation, the second air outlet and the first air outlet are both circular holes;

[0017] A notch is provided at the second air outlet.

[0018] In a possible implementation, the support plate is circular, and the first air outlet is provided at the center of the support plate.

[0019] In a possible implementation, it further includes an inlet connector and an outlet connector;

[0020] The inlet joint is arranged at the pipeline inlet and is connected to the main cylinder; the outlet joint is arranged at the pipeline outlet and is connected to the auxiliary cylinder.

[0021] In a possible implementation, the device further includes a positioning ring; the positioning ring is hollow and communicates with the first air outlet;

[0022] One end of the positioning ring is fixedly connected to the support plate;

[0023] A tooling installation hole and a first groove are formed on the end of the positioning ring that is not fixedly connected to the support plate.

[0024] In a possible implementation, a rib plate is further included; the rib plate is arranged at the connection position between the inlet joint and the main cylinder and at the connection position between the outlet joint and the auxiliary cylinder.

[0025] In a possible implementation, it further includes a pressure-taking inner tube and a pressure-taking outer tube; a pressure-taking hole is opened on the upper top plate;

[0026] One end of the pressure-taking inner tube is arranged in the outlet joint, and the other end passes through the outlet joint and is fixedly connected to the pressure-taking outer tube; the end of the pressure-taking outer tube not connected to the pressure-taking inner tube is connected to the pressure-taking hole.

[0027] In a possible implementation, it also includes a diffusion connecting pipe and a noise reduction pipe;

[0028] A relief hole is provided on the upper top plate; one end of the relief connecting pipe is connected to the auxiliary cylinder, and the other end is connected to the relief hole, suitable for installing a relief valve;

[0029] The noise reduction pipe is fixedly connected to the lower base plate, and the connection position is located directly below the first air outlet on the support plate.

[0030] In a possible implementation, the upper top plate is provided with an integrated voltage regulating core fixing hole, an integrated voltage regulating core mounting hole, and an instrument box mounting hole;

[0031] The integrated pressure regulating core fixing hole is suitable for fixing a matching integrated pressure regulating core; a second groove is formed on the integrated pressure regulating core fixing hole;

[0032] The integrated pressure regulating core mounting holes are arranged at equal intervals around the pressure regulating core fixing hole;

[0033] The instrument box mounting holes are opened at equal intervals on the edge of the upper top plate.

[0034] By arranging the high-pressure and low-pressure chambers in an upper-lower arrangement within the main cylinder, the outer casing structure of the composite cylinder-type single-circuit underground gas pressure regulating tank of the present application embodiment requires only a sealing connection of the support plate within the main cylinder, followed by a sealing connection of the secondary cylinder to the main cylinder. This simple structure, rational layout, and easy processing effectively reduce the difficulty of installation and processing, and allows for flexible configuration of the secondary cylinder structure.

[0035] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the application and, together with the description, serve to explain the principles of the application.

[0037] Figure 1 A front cross-sectional view showing the outer box structure of a composite cylindrical single-circuit underground gas pressure regulating box according to an embodiment of the present application;

[0038] Figure 2 A top view showing the outer box structure of a composite cylindrical single-circuit underground gas pressure regulating box according to an embodiment of the present application;

[0039] Figure 3 A right side view showing the outer box structure of a composite cylindrical single-circuit underground gas pressure regulating box according to an embodiment of the present application;

[0040] Figure 4 A side sectional view showing the outer box structure of a composite cylindrical single-circuit underground gas pressure regulating box according to an embodiment of the present application;

[0041] Figure 5 A front cross-sectional view showing the outer box structure of a composite cylindrical single-circuit underground gas pressure regulating box according to another embodiment of the present application. DETAILED DESCRIPTION

[0042] Various exemplary embodiments, features, and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

[0043] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0045] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0046] In addition, numerous specific details are provided in the detailed description below to better illustrate the present application. Those skilled in the art will appreciate that the present application can be practiced without certain specific details. In some instances, methods, means, components, and circuits well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present application.

[0047] Figures 1 to 5 The present invention shows a front sectional view of the outer box structure of a composite cylinder-type single-circuit underground gas pressure regulating box according to one embodiment of the present application, a top view of the outer box structure of a composite cylinder-type single-circuit underground gas pressure regulating box, a right view of the outer box structure of a composite cylinder-type single-circuit underground gas pressure regulating box, a side sectional view of the outer box structure of a composite cylinder-type single-circuit underground gas pressure regulating box, and a front sectional view of the outer box structure of a composite cylinder-type single-circuit underground gas pressure regulating box according to another embodiment. Figures 1 to 5 As shown, the outer box structure of a composite cylindrical single-circuit underground gas pressure regulating box includes: a main cylinder 6, a secondary cylinder 9, an upper top plate 7, a lower bottom plate 1, and a support plate 3. The main cylinder 6 is hollow in structure, with a second air outlet opening on one side of the lower end and a pipeline inlet on the side wall, suitable for connecting to the gas input pipeline. The upper top plate 7 is installed above the main cylinder 6 and is sealed to the upper wall of the main cylinder 6. The lower bottom plate 1 is installed below the main cylinder 6 and is sealed to the lower wall of the main cylinder 6. The support plate 3 is installed above the second air outlet, with its edge sealed to the inner wall of the main cylinder 6, and a first air outlet 23 is opened on the support plate 3. The secondary cylinder 9 is hollow in structure, with the upper and lower ends of the secondary cylinder 9 being sealed to the upper top plate 7 and the lower bottom plate 1 respectively. The side end is sealed to the side of the main cylinder 6 where the second air outlet is located, surrounding the second air outlet. The other side end is provided with a pipeline outlet, suitable for connecting to the gas output pipeline.

[0048] Therefore, the outer box structure of a composite cylindrical single-circuit underground gas pressure regulating box in the embodiment of the present application is as follows: Figure 1 、 Figure 3 and Figure 4During processing, first open a second air outlet at the lower end of the main cylinder 6, then place the support plate 3 above the second air outlet in the main cylinder 6, and seal the support plate 3 and the inner wall of the main cylinder 6. Then, cover the upper top plate 7 on the top of the main cylinder 6 and seal it with the top of the main cylinder 6, and set the lower bottom plate 1 below the main cylinder 6 and seal it with the bottom of the main cylinder 6. Fix the upper top plate 7, the lower bottom plate 1 and the main cylinder 6 to form a chamber, and divide the chamber into two parts through the support plate 3. The upper end is a high-pressure chamber 8, which is suitable for placing an integrated pressure regulating core for pressure regulation, and the lower end is a low-pressure chamber 12, which is suitable for conveying pressure-regulated gas. The two chambers are connected through the first air outlet 23 on the support plate 3. The auxiliary cylinder body 9 is a hollow structure. The upper and lower ends of the auxiliary cylinder body 9 are sealed to the upper top plate 7 and the lower bottom plate 1, and the side end is sealed to the side of the main cylinder body 6 where the second air outlet is opened, so that the chamber formed by the auxiliary cylinder body 9, the upper top plate 7 and the lower bottom plate 1 is connected to the low-pressure chamber 12 through the second air outlet. When in use, the gas enters the high-pressure chamber 8 from the pipeline inlet, enters the low-pressure chamber 12 through the first air outlet 23 after being pressure-regulated by the integrated pressure regulating core, and then enters the auxiliary cylinder body 9 through the second air outlet, and is finally output through the pipeline outlet. By arranging the high-pressure chamber 8 and the low-pressure chamber 12 in the main cylinder body 6 in an upper and lower structure, it is only necessary to seal the support plate 3 in the main cylinder body 6, and then seal the auxiliary cylinder body 9 to the main cylinder body 6. The structure is simple, the layout is reasonable, and the processing is convenient, which can effectively reduce the difficulty of installation and processing, and the structure of the auxiliary cylinder body 9 can be flexibly set.

[0049] It should be noted that in actual processing and production, both the main cylinder 6 and the auxiliary cylinder 9 can be supported by thick-walled steel pipes. In addition to withstanding the internal gas pressure, they can also withstand the extrusion of the external soil and the load of the upper integrated pressure regulating core and other devices.

[0050] It should also be noted that the sealing connection methods used in the embodiments of the present application can be achieved using existing technologies, such as through welding, which will not be described in detail here.

[0051] In one possible implementation, see Figure 3 and Figure 4 The main cylinder 6 and the auxiliary cylinder 9 have circular cross-sections, meaning that the main body of the underground gas pressure regulating box in this embodiment of the application is a composite cylindrical outer shell consisting of two cylinders. Using cylindrical shapes for the main cylinder 6 and the auxiliary cylinder 9 makes it easier to place the integrated pressure regulating core and occupies less space than cylinders of other shapes.

[0052] It should be noted that the cross-sectional shapes of the main cylinder 6 and the auxiliary cylinder 9 are not limited to circular, and may also be other shapes, such as square, etc., as long as they can meet the requirements, which will not be elaborated here.

[0053] Furthermore, the diameter of the main cylinder 6 is larger than that of the auxiliary cylinder 9. The main cylinder 6 primarily houses the high-pressure chamber 8 and the low-pressure chamber 12, as well as the integrated pressure-regulating core. The auxiliary cylinder 9 primarily surrounds the second gas outlet and provides a connection between the low-pressure chamber 12 and the gas output pipeline. Therefore, designing the diameter of the auxiliary cylinder 9 to be smaller than that of the main cylinder 6 effectively reduces space usage and material costs.

[0054] In one possible implementation, see Figure 1 and Figure 4 The second air outlet and the first air outlet 23 are both circular holes. A notch 24 is provided at the second air outlet. Specifically, the notch 24 is located at the connection between the main cylinder 6 and the lower base plate 1. Compared with the second air outlet, the notch 24 is more convenient to process and saves more materials, effectively reducing costs.

[0055] It should be noted that the shape of the outlet can be rectangular, circular, etc., and can be flexibly changed according to actual conditions.

[0056] In one possible implementation, a pressure-bearing connecting pipe 26 is provided above the main cylinder 6, and the upper top plate 7 is connected to the main cylinder 6 through the pressure-bearing connecting pipe 26; wherein, the upper end of the pressure-bearing connecting pipe 6 is sealedly connected to the upper top plate 7, and an integrated pressure regulating core integrated pressure regulating core mounting hole 1425 is opened on the upper top plate 7, the upper end of the pressure-bearing connecting pipe 6 is welded and fixed to the integrated pressure regulating core integrated pressure regulating core mounting hole 142525, and the lower end matches the opening of the main cylinder 6, and is welded and fixed to the upper side wall of the main cylinder 6.

[0057] Not only that, a pressure-bearing connecting pipe 26 can be added to the upper opening of the main cylinder 6, and the pressure-bearing connecting pipe 26 can be used as a connecting part to be fixedly connected to the upper top plate 7 of the outer shell box. In this way, the upper top plate 8 of the outer shell box does not need to bear more gravity from the installation of the integrated pressure-regulating core, and can bear the main weight of the integrated pressure-regulating core required for installation through the pressure-bearing connecting pipe 26 with a larger thickness. According to this arrangement, the weld between the upper top plate 7 and the main cylinder 6 can be only a structural weld to ensure that it can be fixedly connected without being a pressure-bearing weld. The welding requirements are low and it is easy for technical personnel in this field to operate.

[0058] In one specific embodiment, the thickness of the top plate 7 is between [15 mm, 25 mm]; the thickness of the side wall of the main cylinder 6 is about half the thickness of the pressure-bearing connecting pipe 26, and the two are made of the same material.

[0059] In this embodiment, the pressure-bearing plate is difficult to purchase, and the non-pressure-bearing plate can be made of ordinary steel plates, which are easy to purchase. Therefore, the use of non-pressure-bearing steel plates for the upper top plate 7 is also conducive to reasonably reducing the procurement cycle.

[0060] It also includes a pad, and a plurality of integrated pressure regulating core mounting holes 14 are arranged on the outer ring of the integrated pressure regulating core mounting hole 1425. Pads are added at the positions where the integrated pressure regulating core mounting holes 14 are opened on the upper top plate 7. The same integrated pressure regulating core mounting holes 14 are opened on the pads, and do not interfere with the pressure regulating core.

[0061] In this embodiment, compared to the technical solution of directly welding the main cylinder 6 to the upper top plate 7, the integrated pressure-regulating core mounting hole 14 for installing the pressure-regulating core is machined into the pressure-bearing top plate, resulting in a thicker pressure-bearing top plate. By using a non-pressure-bearing top plate, the overall thickness can be reduced, requiring only welding a thickening plate at the location of the integrated pressure-regulating core mounting hole 14, thus reducing material usage and costs.

[0062] In a possible implementation, the axial height of the pressure-bearing connecting pipe 26 is greater than the thickness of the upper top plate 7 ; and the side wall thickness of the pressure-bearing connecting pipe 26 is greater than the side wall thickness of the upper top plate 7 .

[0063] In one embodiment, the axial height of the pressure-bearing connecting pipe 26 is greater than the thickness of the upper plate 7, and the side wall thickness of the pressure-bearing connecting pipe 26 is greater than the side wall thickness of the main cylinder 6. The entire structure is a single component, which is machined after welding, with high positioning accuracy, does not require welding with other components, and can be modularized and mass-produced.

[0064] The system utilizes common steel plates and steel pipes welded together into a single unit, significantly reducing the number of welds and overall welding effort compared to traditional pipe flange and fitting welding methods. The system is a single welded component, with only a few flanges and threaded connections used internally with components like the integrated pressure regulator and relief valve. This significantly reduces potential leak points compared to traditional pipe flange connections.

[0065] In one possible implementation, see Figure 1 and Figure 4 The support plate 3 is circular, and the first gas outlet 23 is located at the center of the support plate 3. This location allows for more uniform flow of gas from the high-pressure chamber 8 into the low-pressure chamber 12, facilitating easier machining of the support plate 3. It also serves as a positioning mechanism during installation of the integrated pressure regulating core.

[0066] In one possible implementation, see Figure 1 and Figure 2, further comprising an inlet connector 5 and an outlet connector 10. The inlet connector 5 is disposed at the pipeline inlet and communicates with the main cylinder 6. The outlet connector 10 is disposed at the pipeline outlet and communicates with the auxiliary cylinder 9. Specifically, the inlet connector 5 is connected to the main cylinder 6 by welding, and the outlet connector 10 is connected to the auxiliary cylinder 9 by welding. The outlet connector 10 and the inlet connector 5 both use the same pipe fittings and are at the same vertical distance from the lower base plate 1, providing good transmission performance.

[0067] In one possible implementation, see Figure 1 , also includes a positioning ring 4, which has a hollow structure and is connected to the first air outlet 23. One end of the positioning ring 4 is fixedly connected to the support plate 3, and the end of the positioning ring 4 that is not fixedly connected to the support plate 3 is provided with a tooling mounting hole 17 and a first groove 16. By providing the positioning ring 4, it is convenient to position and align the integrated pressure regulating core when installing it. By providing the tooling mounting hole 17, a pressure test tool can be installed to close the first air outlet 23 provided on the support plate 3, and in conjunction with the inlet valve installed on the inlet connector 5 and the outlet valve on the outlet connector 10, the pressure strength test of the high-pressure chamber 8 and the low-pressure chamber 12 can be performed respectively. By providing the first groove 16 and using the bottom of the first groove 16 as the lower sealing surface, a rubber pad can be installed to achieve sealing between the integrated pressure regulating core and the support plate 3.

[0068] In one possible implementation, see Figure 1 , further comprising ribs 11, which are provided at the connection points between the inlet connector 5 and the main cylinder 6, and at the connection points between the outlet connector 10 and the auxiliary cylinder 9. Specifically, both connections are welded. The provision of ribs 11 reduces the tensile force exerted by the welds between the outer casing and the external gas pipeline on the welds between the main cylinder 6 and the inlet connector 5, and between the auxiliary cylinder 9 and the outlet connector 10, thereby improving the safety factor.

[0069] In one possible implementation, see Figure 1 、 Figure 3 and Figure 4 , further comprising an inner pressure-taking tube 22 and an outer pressure-taking tube 20, with a pressure-taking hole 19 being provided on the upper top plate 7. Specifically, one end of the inner pressure-taking tube 22 is disposed within the outlet connector 10, and the other end passes through the outlet connector 10 and is fixedly connected to the outer pressure-taking tube 20. The end of the outer pressure-taking tube 20 not connected to the inner pressure-taking tube 22 communicates with the pressure-taking hole 19.

[0070] In one possible implementation, see Figure 1 、 Figure 3 and Figure 4, also includes a discharge connecting pipe 21 and a noise reduction pipe 2. A discharge hole 18 is provided on the upper top plate 7. One end of the discharge connecting pipe 21 connects to the auxiliary cylinder 9, and the other end connects to the discharge hole 18, suitable for installing a discharge valve. The discharge connecting pipe 21, in conjunction with the discharge valve, allows gas to be discharged when pressure exceeds a specified value, improving the safety of the outer casing.

[0071] The noise reduction pipe 2 is fixedly connected to the lower base plate 1, and the connection position is located directly below the first air outlet 23 on the support plate 3. By providing the noise reduction pipe 2, the noise caused by the turbulent flow at the outlet of the integrated pressure regulating core can be effectively reduced.

[0072] In one possible implementation, see Figure 2 , the upper top plate 7 is provided with an integrated voltage regulating core fixing hole 25, an integrated voltage regulating core mounting hole 14 and an instrument box mounting hole 13. The integrated voltage regulating core fixing hole 25 is suitable for fixing a matching integrated voltage regulating core.

[0073] Furthermore, a second groove 15 is provided on the integrated pressure regulating core fixing hole 25. Specifically, the bottom of the second groove 15 serves as an upper sealing surface, and a rubber ring can be installed with the integrated pressure regulating core to achieve sealing between the integrated pressure regulating core and the upper top plate 7.

[0074] Furthermore, the integrated voltage regulating core mounting holes 14 are evenly spaced around the integrated voltage regulating core fixing hole 25. Specifically, the number of the integrated voltage regulating core mounting holes 14 is 4-8, and they are evenly spaced around the integrated voltage regulating core fixing hole 25.

[0075] The instrument box mounting holes 13 are opened at equal intervals on the edge of the upper top plate 7 and are suitable for mounting the instrument box. Specifically, there are 20 instrument box mounting holes 13 .

[0076] It should be noted that although Figures 1 to 4 The above describes the outer box structure of a composite cylindrical single-circuit underground gas pressure regulating box as an example, but those skilled in the art will understand that the present application should not be limited to this. In fact, users can flexibly customize the structure based on their personal preferences and / or actual application scenarios, as long as the design is reasonable.

[0077] The embodiments of the present application have been described above. The above description is illustrative and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. An outer box structure of a composite cylindrical single-circuit underground gas pressure regulating box, characterized in that: include: Main cylinder, auxiliary cylinder, upper top plate, lower bottom plate and support plate; The main cylinder is hollow in structure, with a second gas outlet opening on one side of the lower end and a pipeline inlet on the side wall, suitable for connecting to a gas input pipeline; The upper top plate cover is arranged above the main cylinder and is sealed to the upper part of the cylinder wall of the main cylinder; The lower base plate is arranged below the main cylinder and is sealed to the lower side of the main cylinder wall; The support plate is arranged above the second air outlet, the edge of which is sealed with the inner wall of the main cylinder, and the support plate is provided with a first air outlet; The auxiliary cylinder has a hollow structure, and the upper and lower ends of the auxiliary cylinder wall are sealedly connected to the upper top plate and the lower bottom plate respectively. One side is sealedly connected to the side of the main cylinder where the second gas outlet is located, surrounding the second gas outlet, and the other side is provided with a pipeline outlet suitable for connecting to the gas output pipeline. A pressure-bearing connecting pipe is provided above the main cylinder, and the upper plate is connected to the main cylinder through the pressure-bearing connecting pipe; The upper end of the pressure-bearing connecting pipe is sealed and connected to the upper top plate. A pressure-regulating core mounting hole is provided on the upper top plate. The upper end of the pressure-bearing connecting pipe is welded and fixed to the position of the pressure-regulating core mounting hole. The lower end matches the opening of the main cylinder and is welded and fixed to the upper side wall of the main cylinder. The cross section of the main cylinder is circular; the cross section of the auxiliary cylinder is circular; The diameter of the main cylinder is greater than the diameter of the auxiliary cylinder; The second air outlet and the first air outlet are both circular holes; A notch is provided at the second air outlet; The support plate is circular, and the first air outlet is opened at the center of the support plate.

2. The outer box structure of the composite cylindrical single-circuit underground gas pressure regulating box according to claim 1 is characterized in that: The axial height of the pressure-bearing connecting pipe is greater than the thickness of the upper top plate; The side wall thickness of the pressure-bearing connecting pipe is greater than the side wall thickness of the upper top plate.

3. The outer box structure of a composite cylindrical single-circuit underground gas pressure regulating box according to claim 1 is characterized in that: Also included are an inlet connector and an outlet connector; The inlet joint is arranged at the pipeline inlet and is connected to the main cylinder; the outlet joint is arranged at the pipeline outlet and is connected to the auxiliary cylinder.

4. The outer box structure of a composite cylindrical single-circuit underground gas pressure regulating box according to claim 1 is characterized in that: It also includes a positioning ring; the positioning ring is a hollow structure, connected to the first air outlet; One end of the positioning ring is fixedly connected to the support plate; A tooling installation hole and a first groove are formed on the end of the positioning ring that is not fixedly connected to the support plate.

5. The outer box structure of the composite cylindrical single-circuit underground gas pressure regulating box according to claim 3 is characterized in that: It also includes a rib plate; the rib plate is arranged at the connection position between the inlet joint and the main cylinder body and at the connection position between the outlet joint and the auxiliary cylinder body.

6. The outer box structure of the composite cylindrical single-circuit underground gas pressure regulating box according to claim 3 is characterized in that: It also includes a pressure taking inner tube and a pressure taking outer tube; a pressure taking hole is opened on the top plate; One end of the pressure-taking inner tube is arranged in the outlet joint, and the other end passes through the outlet joint and is fixedly connected to the pressure-taking outer tube; the end of the pressure-taking outer tube not connected to the pressure-taking inner tube is connected to the pressure-taking hole.

7. The outer box structure of a composite cylindrical single-circuit underground gas pressure regulating box according to claim 1 is characterized in that: It also includes venting connecting pipes and noise reduction pipes; A relief hole is provided on the upper top plate; one end of the relief connecting pipe is connected to the auxiliary cylinder, and the other end is connected to the relief hole, suitable for installing a relief valve; The noise reduction pipe is fixedly connected to the lower base plate, and the connection position is located directly below the first air outlet on the support plate.

8. The outer box structure of a composite cylindrical single-circuit underground gas pressure regulating box according to any one of claims 1 to 7, characterized in that: The upper top plate is provided with an integrated voltage regulating core fixing hole, an integrated voltage regulating core mounting hole and an instrument box mounting hole; The integrated pressure regulating core fixing hole is suitable for fixing a matching integrated pressure regulating core; a second groove is formed on the integrated pressure regulating core fixing hole; The integrated pressure regulating core mounting holes are arranged at equal intervals around the pressure regulating core fixing hole; The instrument box mounting holes are opened at equal intervals on the edge of the upper top plate.

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