Outer box structure of single-cylinder single-circuit underground gas pressure regulating box

Abstract

The present application relates to an outer box structure of a single-cylinder single-circuit underground gas pressure regulating box, comprising a main cylinder, a partition and an outer shell. The interior of the main cylinder is hollow and the upper part is open. The partition is fixedly arranged in the main cylinder. A connecting hole is horizontally opened on the partition, dividing the main cylinder into a high-pressure chamber and a low-pressure chamber that are connected. The high-pressure chamber is connected to the inlet pipeline, and the low-pressure chamber is connected to the outlet pipeline. The outer shell is covered and arranged on the outside of the main cylinder. The upper part of the main cylinder is sealed with the upper top plate of the outer shell or a pressure-bearing connecting pipe is provided above the main cylinder, and the upper end of the pressure-bearing connecting pipe is sealed with the upper top plate of the outer shell. By using the upper top plate or the pressure-bearing connecting pipe as a pressure-bearing part, the mounting structure of the integrated pressure regulating core is fixed to the corresponding position of the upper top plate, and the pressure regulating core body extends into the high-pressure chamber. Under the premise of ensuring a reasonable layout, the structure is simple and easy to be processed by practitioners in this field.

Description

Technical Field

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

[0002] With the development of the economy and society, gas has been widely used, and with it, gas pressure regulating boxes, essential components of gas transmission and distribution systems. Traditional above-ground pressure regulating boxes utilize pipe flange connections, occupying significant space above ground and requiring high safety clearances. The design and site selection for these boxes must meet both safety clearance requirements and be within the building boundary. In today's urban construction landscape, where land is at a premium, areas meeting these requirements are rare, making site selection challenging. Consequently, underground gas pressure regulating boxes, which require less safety clearances, have emerged.

[0003] In the actual use of underground pressure regulating boxes, integrated gas underground pressure regulating boxes that can bear weight, are waterproof and sealed, take up little space, have an integrated design, and are easy to maintain and repair are increasingly recognized by users and relevant management units, representing the development direction of underground pressure regulating boxes.

[0004] The outer shell of the underground pressure regulating box is connected to the inlet and outlet valves, providing space for the gas flow path and the installation of the integrated pressure regulating device. It is in contact with the gas inside and the soil outside. It has the ability to withstand the gas pressure, the surrounding soil pressure and the load caused by pedestrians and vehicles stepping on and crushing the equipment. It is an important component required to ensure the safe operation of the underground pressure regulating box.

[0005] 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

[0006] In view of this, the present application proposes an outer box structure of a single-cylinder single-circuit underground gas pressure regulating box, including a main cylinder, a partition and an upper top plate; the interior of the main cylinder is hollow and the upper part is open; the partition is fixedly arranged in the main cylinder, and a connecting hole is horizontally opened on the partition, dividing the main cylinder into a connected high-pressure chamber and a low-pressure chamber; the high-pressure chamber is connected to the inlet pipeline, and the interior is suitable for placing a pressure regulating core; the low-pressure chamber is connected to the outlet pipeline; the upper top plate cover is arranged above the main cylinder, and the upper part of the main cylinder is sealed and connected to the upper top plate.

[0007] In one possible implementation, a pressure regulating core mounting hole is opened 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, 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.

[0008] In one possible implementation, a pressure regulating core mounting hole is provided on the upper top plate. When the upper part of the main cylinder is sealed and connected to the upper top plate of the outer shell box, the upper part of the main cylinder is welded and fixed to the position of the pressure regulating core mounting hole, and the thickness of the upper top plate is greater than the thickness of the main cylinder.

[0009] In one possible implementation, the partition includes a support plate and a connecting plate; the support plate is horizontally placed at a preset height above the bottom of the main cylinder, the connecting hole is opened on the support plate, the longitudinal projection area of ​​the support plate is larger than the open area of ​​the main cylinder, part of the edge of the support plate is welded and fixed to the inner wall of the main cylinder, the rest of the support plate is welded and fixed to the lower outer edge of the connecting plate, and the top outer edge of the connecting plate is welded and fixed to the inner wall of the main cylinder.

[0010] In a possible implementation, it also includes an outer shell box, which is matched with the upper top plate to cover the outside of the main cylinder, and the outer shell box includes side plates and a lower bottom plate; the lower bottom plate is arranged below the main cylinder, and the side plates are arranged around the outside of the main cylinder, and the top is sealed with the upper top plate.

[0011] 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 main cylinder.

[0012] In one possible implementation, the main cylinder body has a hollow cylindrical structure, and the connecting plate includes a baffle and a crescent plate; the crescent plate is horizontally placed in the main cylinder body, and the convex arc side is welded and fixed to the inner wall of the main cylinder body; the baffle is vertically placed in the main cylinder body, and the upper edge matches the concave arc side of the crescent plate and is welded and fixed, and the lower edge of the baffle is welded and fixed to the support plate.

[0013] In one possible implementation, the outlet pipeline is upwardly connected to a relief pipeline, a relief hole is opened on the upper top plate, two relief holes are provided, and the relief pipeline passes through the relief holes to be connected to the outside of the outer shell box; the outlet pipeline is upwardly connected to a pressure taking pipeline, a pressure taking hole is opened on the upper top plate, two pressure taking holes are provided, and the pressure taking pipeline passes through the pressure taking holes to be connected to the outside of the outer shell box.

[0014] In one possible implementation, the communicating hole is located on the support plate at the center of the main cylinder, and the communicating hole extends toward the top of the main cylinder and is provided with a positioning ring; it also includes a noise reduction tube; the noise reduction tube is arranged in the low-pressure chamber, below the communicating hole, and the noise reduction tube has a cylindrical structure with a plurality of circular holes on the side wall, and the noise reduction tube is coaxially arranged with the communicating hole.

[0015] In a possible implementation, it further includes a pad; a plurality of fixing holes are provided around the outer side of the pressure-regulating core mounting hole, and the pad is additionally provided at the position where the fixing holes are provided on the upper top plate; the same fixing holes are provided on the pad, and do not interfere with the pressure-regulating core; the thickness of the upper top plate is between [15mm, 25mm]; the thickness of the side wall of the main cylinder is approximately half of the wall thickness of the pressure-bearing connecting pipe, and the two are made of the same material.

[0016] The beneficial effects of the present application are as follows: a single main cylinder is divided into a high-pressure chamber and a low-pressure chamber that are interconnected by a partition, and the high-pressure chamber is connected to the inlet pipeline, and the low-pressure chamber is connected to the outlet pipeline, and the outer shell is enclosed in the main cylinder. The upper part of the main cylinder can be directly and hermetically connected to the upper top plate of the outer shell, that is, the upper top plate is used as a pressure-bearing part, and the mounting structure of the integrated pressure regulating core is fixed to the corresponding position of the upper top plate, and the pressure regulating core body extends into the high-pressure chamber. Under the premise of ensuring a reasonable layout, the structure is simple and easy to be processed by personnel in this field; and the partition can be flexibly set to change the internal structure of the high-pressure chamber and the low-pressure chamber in the main cylinder.

[0017] 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

[0018] 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.

[0019] Figure 1 A front cross-sectional view showing the outer box structure of a single-tube single-circuit underground gas pressure regulating box according to an embodiment of the present application;

[0020] Figure 2 A top view showing the outer box structure of a single-tube single-circuit underground gas pressure regulating box according to an embodiment of the present application;

[0021] Figure 3 A side sectional view showing the outer box structure of a single-tube single-circuit underground gas pressure regulating box according to an embodiment of the present application;

[0022] Figure 4A top cross-sectional view showing the outer box structure of a single-tube single-circuit underground gas pressure regulating box according to an embodiment of the present application;

[0023] Figure 5 A front cross-sectional view showing the outer box structure of a single-cylinder single-circuit underground gas pressure regulating box according to another embodiment of the present application. DETAILED DESCRIPTION

[0024] 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.

[0025] 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 indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 a limitation on the present application.

[0026] 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 defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0027] 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.

[0028] 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.

[0029] Figure 1 A front cross-sectional view showing the outer box structure of a single-tube single-circuit underground gas pressure regulating box according to an embodiment of the present application; Figure 2 A top view showing the outer box structure of a single-tube single-circuit underground gas pressure regulating box according to an embodiment of the present application; Figure 3 A side sectional view showing the outer box structure of a single-tube single-circuit underground gas pressure regulating box according to an embodiment of the present application; Figure 4 A top cross-sectional view showing the outer box structure of a single-tube single-circuit underground gas pressure regulating box according to an embodiment of the present application; Figure 5 A front cross-sectional view showing the outer box structure of a single-cylinder single-circuit underground gas pressure regulating box according to another embodiment of the present application.

[0030] like Figure 1-Figure 5 As shown, the outer box structure of the single-cylinder single-channel underground gas pressure regulating box includes: a main cylinder 7, a partition and an upper top plate 8. The interior of the main cylinder 7 is hollow and the upper part is open. The partition is fixedly arranged in the main cylinder 7. A connecting hole is horizontally opened on the partition, which divides the main cylinder 7 into a connected high-pressure chamber 9 and a low-pressure chamber 13. The high-pressure chamber 9 is connected to the inlet pipeline 6, and the interior is suitable for placing a pressure regulating core. The low-pressure chamber 13 is connected to the outlet pipeline 12. The upper top plate 8 is covered on the top of the main cylinder 7, and the upper part of the main cylinder 7 is sealed with the upper top plate 8.

[0031] In this embodiment, the interior of a single main cylinder 7 is divided into a high-pressure chamber 9 and a low-pressure chamber 13 that are interconnected by a partition, and the high-pressure chamber 9 is connected to the inlet pipe 6, and the low-pressure chamber 13 is connected to the outlet pipe 12, and the upper top plate 8 is covered on the main cylinder 7. The upper part of the main cylinder 7 can be directly and hermetically connected to the upper top plate 8, that is, the upper top plate 8 is used as a pressure-bearing part, and the mounting structure of the integrated pressure regulating core is fixed to the corresponding position of the upper top plate 8, and the main body of the pressure regulating core extends into the high-pressure chamber 9. Under the premise of ensuring a reasonable layout, the structure is simple and easy to process by personnel in this field; and the partition can be flexibly set to change the internal structure of the high-pressure chamber 9 and the low-pressure chamber 13 in the main cylinder 7.

[0032] It should be noted that in actual processing and production, the main cylinder 7, the partition and the pressure-bearing connecting pipe 25 can all 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.

[0033] It should also be emphasized 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.

[0034] Furthermore, the specific structure of the outer shell box can be a variety of structures, usually in a regular shape, and the outer shell box provided on the outer cover of the pressure regulating pipeline can effectively protect the overall structure of the pressure regulating pipeline from being corroded as little as possible by external soil, etc., reasonably extending the service life of the device itself, and also avoiding direct contact between the pressure-bearing main cylinder 7 and other components and the external environment, so that the safety of the equipment is sufficiently guaranteed.

[0035] In one specific embodiment, an integrated pressure regulating core mounting hole 14 is opened on the upper top plate 8, and a pressure-bearing connecting pipe 25 is provided above the main cylinder 7. The upper end of the pressure-bearing connecting pipe 25 is sealedly connected to the upper top plate 8, and the upper end of the pressure-bearing connecting pipe 25 is welded and fixed to the position of the integrated pressure regulating core mounting hole 14, and the lower end matches the opening of the main cylinder 7 and is welded and fixed to the upper side wall of the main cylinder 7.

[0036] Not only that, a pressure-bearing connecting pipe 25 can be added to the upper opening of the main cylinder 7, and the pressure-bearing connecting pipe 25 can be used as a connecting part to be fixedly connected to 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 the main weight of the integrated pressure-regulating core required for installation can be borne by the pressure-bearing connecting pipe 25 with a larger thickness. According to this arrangement, the weld between the upper top plate 8 and the main cylinder 7 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.

[0037] In one specific embodiment, an integrated pressure regulating core mounting hole 14 is opened on the upper top plate 8. When the upper part of the main cylinder 7 is sealedly connected to the upper top plate 8 of the outer shell box, the upper part of the main cylinder 7 is welded and fixed to the position of the integrated pressure regulating core mounting hole 14, and the thickness of the upper top plate 8 is greater than the thickness of the main cylinder 7.

[0038] In one specific embodiment, the partition includes a support plate 3 and a connecting plate. The support plate 3 is horizontally placed at a preset height above the bottom of the main cylinder 7. The connecting hole is opened on the support plate 3. The longitudinal projection area of ​​the support plate 3 is larger than the open area of ​​the main cylinder 7. Part of the edge of the support plate 3 is welded and fixed to the inner wall of the main cylinder 7, and the remaining part of the support plate 3 is welded and fixed to the lower outer edge of the connecting plate. The top outer edge of the connecting plate is welded and fixed to the inner wall of the main cylinder 7.

[0039] In one specific embodiment, the axial height of the pressure-bearing connecting pipe 25 is greater than the thickness of the upper plate 8, and the side wall thickness of the pressure-bearing connecting pipe 25 is greater than the side wall thickness of the main cylinder 7. 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.

[0040] In this embodiment, commonly used steel plates and steel pipes are welded together to form a single unit. This significantly reduces the number of welds and the overall welding effort compared to traditional pipe flange and fitting welding methods. The entire unit is a single welded component. Except for a few internal flanges and threaded connections to components such as the integrated pressure regulator and relief valve, all other connections are welded. This significantly reduces potential leak points compared to traditional pipe flange connections.

[0041] In one specific embodiment, it also includes an outer shell box, which cooperates with the upper top plate 8 to cover the outside of the main cylinder 7, and the outer shell box includes side panels 26 and a lower bottom plate 27; the lower bottom plate 27 is arranged below the main cylinder 7, and the side panels 26 are arranged around the outside of the main cylinder 7, and the top is sealed with the upper top plate 8.

[0042] In one specific embodiment, the main cylinder 7 has a hollow cylindrical structure, and the connecting plate includes a baffle 11 and a crescent plate 10. The crescent plate 10 is placed horizontally in the main cylinder 7, and the convex arc side is welded and fixed to the inner wall of the main cylinder 7. The baffle 11 is placed vertically in the main cylinder 7, and the upper edge matches the concave arc side of the crescent plate 10 and is welded and fixed. The lower edge of the baffle 11 is welded and fixed to the support plate 3.

[0043] In one specific embodiment, the thickness of the top plate 8 is between [15 mm, 25 mm]; the thickness of the side wall of the main cylinder 7 is about half the thickness of the pressure-bearing connecting pipe 25, and the two are made of the same material.

[0044] 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 8 is also conducive to reasonably reducing the procurement cycle.

[0045] In one specific embodiment, the outlet pipe 12 is upwardly connected to a relief pipe 22, a relief hole 19 is opened on the upper top plate 8, two relief holes 19 are provided, and the relief pipe 22 is connected to the outside of the outer shell box through the relief hole 19, and the outlet pipe 12 is upwardly connected to a pressure taking pipe, a pressure taking hole 20 is opened on the upper top plate 8, two pressure taking holes 20 are provided, and the pressure taking pipe is connected to the outside of the outer shell box through the pressure taking holes 20.

[0046] In one specific embodiment, the position of the communicating hole on the support plate 3 is located at the center of the main cylinder 7, and the communicating hole extends toward the top of the main cylinder 7, and is provided with a positioning ring 4, and also includes a noise reduction tube 2; the noise reduction tube 2 is arranged in the low-pressure chamber, below the communicating hole, and the noise reduction tube 2 is a cylindrical structure with multiple circular holes on the side wall, and the noise reduction tube 2 is coaxially arranged with the communicating hole.

[0047] In this embodiment, a connecting hole is defined at the point where the high-pressure chamber 9 connects to the low-pressure chamber 13. This hole extends a distance toward the top of the main cylinder 7, forming a mounting platform for mounting a positioning ring 4 to facilitate positioning of the integrated pressure-regulating core during installation. A noise reduction tube 2 is provided at the inner bottom of the low-pressure chamber, coaxially arranged with the connecting hole, directly below the connecting hole.

[0048] In one specific embodiment, a pad is also included. A plurality of fixing holes are arranged around the outer ring of the integrated pressure regulating core mounting hole 14. Pads are added at the positions where the fixing holes are opened on the upper top plate 8. The pads are provided with the same fixing holes and do not interfere with the pressure regulating core.

[0049] In this embodiment, compared to the technical solution of directly welding the main cylinder 7 to the upper top plate 8, the fixing holes for installing the pressure-regulating core are machined in 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 thickening plates at the fixing holes. This reduces material usage and thus costs.

[0050] In one specific embodiment, the outer box structure of the single-cylinder single-circuit underground gas pressure regulating box of the present application is mainly composed of an upper top plate 8, a cylinder 7, a support plate 3, a lower bottom plate 27, an inlet pipeline 6, an outlet pipeline 12 and other components.

[0051] An instrument box mounting hole 15 is processed on the upper top plate 8, and an underground pressure regulating box instrument box can be installed on it; an integrated pressure regulating core mounting hole 14 is processed, and a fixed integrated pressure regulating core can be installed on it; an upper sealing surface 16 is processed, and a rubber ring can be installed to achieve a seal between the integrated pressure regulating core and the upper top plate 8.

[0052] The cylinder 7 is made of steel pipe, and the inlet pipe 6 is welded to the opening of the tube body; one side of the tube body is welded to the upper top plate 8, and one side is welded to the lower bottom plate 27; the support plate 3, 10 crescent plate, 11 baffle, and 23 baffle strip are welded inside, and the cylinder 7 is divided into a high-pressure chamber 9 and a low-pressure chamber 13 by these four parts.

[0053] The high-pressure chamber 9 accommodates the main part of the integrated pressure-regulating core, wherein a positioning ring 4 is welded on the support plate 3, which facilitates positioning and alignment when installing the integrated pressure-regulating core; a lower sealing surface 17 is processed in the internal area of ​​the positioning ring 4, and a rubber pad is installed to achieve sealing between the integrated pressure-regulating core and the support plate 3.

[0054] A tool mounting hole 18 is processed on the positioning ring 4, and a pressure test tool can be installed to close the outlet hole on the support plate 3. The corresponding pressure test tool can be installed on the integrated pressure regulating core mounting hole 14. After the inlet and outlet valves are welded to the inlet pipeline 6 and the outlet pipeline 12, the high-pressure chamber 9 and the low-pressure chamber 13 can be subjected to pressure strength tests respectively.

[0055] Welding the noise reduction pipe 2 on the lower bottom plate 27 just below the outlet hole on the support plate 3 can effectively reduce the noise caused by the turbulent flow at the outlet of the integrated pressure regulating core.

[0056] Welded to the outlet pipe 12 are an outer pressure-taking tube 21, an inner pressure-taking tube 24, and a discharge connecting tube 22. The outer pressure-taking tube 21 is connected to the pressure-taking hole 20 on the upper top plate 8, while the discharge connecting tube 22 is connected to the discharge hole 19 on the upper top plate 8. The outer pressure-taking tube 21 communicates with the inner pressure tube 24, accurately transmitting the gas pressure value after the outlet pipe 12 has stabilized through the long straight pipe section to the pressure-taking hole 20.

[0057] The pressure taking hole 20 is connected to the pressure taking hole of the corresponding equipment of the integrated pressure regulating core, and the relief hole 19 is connected to the relief valve.

[0058] Holes are opened on the body of the cylinder 7 to weld the inlet pipeline 6 and the outlet pipeline 12, and stiffeners 5 are welded at the upper and lower positions where the inlet and outlet pipes are connected to the main cylinder 7 to reduce the tension of the pipeline network on the welds between the main cylinder 7 and the inlet pipeline 6 and the outlet pipeline 12 after the equipment and the pipeline network are welded, thereby improving the safety factor.

[0059] The cylinder 7 is connected to the top plate 8 at the top and the bottom plate 27 at the bottom. It is made of thick-walled steel pipe. In addition to being able to withstand the internal gas pressure, it can also withstand the extrusion of the external soil and the load on it from the top.

[0060] 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 single-tube single-circuit underground gas pressure regulating box, characterized in that: It includes a main cylinder, a partition and an upper top plate; The main cylinder is hollow inside and open at the top; The partition is fixedly arranged in the main cylinder, and a communication hole is transversely opened on the partition to divide the main cylinder into a high-pressure chamber and a low-pressure chamber that are connected; The high-pressure chamber is connected to the inlet pipeline, and the interior is suitable for placing a pressure regulating core; The low-pressure chamber is connected to the outlet pipeline; The upper top plate cover is arranged above the main cylinder, and the upper part of the main cylinder is sealed and connected to the upper top plate; 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. A pressure regulating core mounting hole is provided on the upper top plate. When the upper part of the main cylinder is sealed with the upper top plate, the upper part of the main cylinder is welded and fixed to the position of the pressure regulating core mounting hole, and the thickness of the upper top plate is greater than the thickness of the main cylinder.

2. The outer box structure of the single-tube single-circuit underground gas pressure regulating box according to claim 1 is characterized in that: The partition comprises a supporting plate and a connecting plate; The support plate is placed horizontally at a preset height above the bottom of the main cylinder, the communicating hole is opened on the support plate, the longitudinal projection area of ​​the support plate is larger than the open area of ​​the main cylinder, part of the edge of the support plate is welded and fixed to the inner wall of the main cylinder, the rest of the support plate is welded and fixed to the lower outer edge of the connecting plate, and the top outer edge of the connecting plate is welded and fixed to the inner wall of the main cylinder.

3. The outer box structure of the single-tube single-circuit underground gas pressure regulating box according to claim 1 is characterized in that: It also includes an outer shell box, which cooperates with the upper top plate to cover the outside of the main cylinder, and the outer shell box includes side plates and a lower bottom plate; The lower base plate is arranged below the main cylinder, the side plates are arranged outside the main cylinder, and the top is sealed and connected to the upper plate.

4. The outer box structure of the single-tube 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 main cylinder.

5. The outer box structure of the single-tube single-circuit underground gas pressure regulating box according to claim 2 is characterized in that: The main cylinder is a hollow cylindrical structure, and the connecting plate includes a baffle and a crescent plate; The crescent plate is placed horizontally in the main cylinder, and the convex arc side is welded and fixed to the inner wall of the main cylinder; The baffle is vertically arranged in the main cylinder, the upper edge of which matches the concave arc side of the crescent plate and is fixed by welding, and the lower edge of the baffle is fixed by welding to the support plate.

6. The outer box structure of the single-tube single-circuit underground gas pressure regulating box according to claim 3 is characterized in that: The outlet pipe is upwardly connected to a vent pipe, and a vent hole is provided on the top plate, two vent holes are provided, and the vent pipe passes through the vent holes and is connected to the outside of the outer casing; The outlet pipeline is upwardly connected to a pressure-taking pipeline. A pressure-taking hole is provided on the upper top plate. Two pressure-taking holes are provided. The pressure-taking pipeline passes through the pressure-taking holes and is connected to the outside of the outer casing.

7. The outer box structure of the single-tube single-circuit underground gas pressure regulating box according to claim 2 is characterized in that: The communication hole on the support plate is located at the center of the main cylinder, and the communication hole extends toward the top of the main cylinder and is provided with a positioning ring; Also included are noise reduction tubes; The noise reduction pipe is arranged in the low-pressure chamber and below the communicating hole. The noise reduction pipe is cylindrical in structure and has a plurality of circular holes on its side wall. The noise reduction pipe is coaxially arranged with the communicating hole.

8. The outer box structure of the single-tube single-circuit underground gas pressure regulating box according to claim 1 is characterized in that: Also includes backing plates; A plurality of fixing holes are arranged around the outer side of the mounting hole of the pressure regulating core, and the pads are added at the positions where the fixing holes are opened on the top plate; The same fixing holes are provided on the backing plate and do not interfere with the voltage regulating core; The thickness of the top plate is between [15mm, 25mm]; The thickness of the side wall of the main cylinder is half of the wall thickness of the pressure-bearing connecting pipe, and the two are made of the same material.

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