Large-flow CNG (compressed natural gas) pressure regulating device

Abstract

The invention discloses a high-flow CNG (compressed natural gas) pressure regulating device, which relates to the technical field of natural gas pressure regulation, and comprises two pressure regulating pipes which are coaxially arranged, each pressure regulating pipe is provided with a valve, and the opposite ends of the two pressure regulating pipes are jointly provided with a first pressure regulating piece for regulating air pressure; the two pressure adjusting pipes are each provided with an externally-connected movable piece capable of rotating and fixing the position after rotation, the two externally-connected movable pieces are each detachably connected with an externally-connected pipe, the two externally-connected pipes are jointly detachably connected with a temporary pressure adjusting piece used for adjusting air pressure, and each externally-connected pipe is provided with a supporting piece. The external movable part is arranged on the pressure regulating pipe to install the temporary pressure regulating part, so that normal gas supply can be guaranteed when the first pressure regulating part breaks down, the external movable part, the external pipe and the temporary pressure regulating part can be detached and can be applied to different first pressure regulating parts for use, the size of the whole device is reduced, and the cost is reduced. And the equipment cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of natural gas pressure regulation, and in particular to a large-flow CNG pressure regulating device. Background Art

[0002] CNG refers to gaseous natural gas compressed to a pressure greater than or equal to 10MPa and not greater than 25MPa. It is natural gas that is pressurized and stored in a container in a gaseous state. It is widely used in the fields of automobile fuel, etc. For example, in a gas supply station in a city, the compressed natural gas transported by a CNG skid truck enters the pressure regulating skid station through the gas unloading column and high-pressure gas unloading pipeline in the gas supply station. The compressed natural gas with a large flow rate is adjusted in pressure by the pressure regulating device and then input into the gas-using equipment. The pressure regulating device is generally also called a pressure reducing device. For example, the pressure regulating device model ERJ-10000 / 25C has a flow rate of 10000Nm 3 / h, the working pressure at the equipment inlet reaches 20Mpa, which can be reduced to 3Mpa after the second-stage pressure regulation, and can be reduced to 0.5-0.8Mpa after the third-stage pressure regulation. The pressure regulating device specifically includes pressure reducing valve, safety valve, heating device and natural gas filter.

[0003] The utility model patent with the existing patent announcement number CN205938519U discloses a CNG pressure regulating device, which has two groups of pressure regulating devices. The two groups of pressure regulating devices can perform gas pressure regulation separately to improve work efficiency. When a fault occurs, just close the control valve of one of the pressure regulating devices and let the other pressure regulating device work alone. It is possible to use the elimination method to determine which pressure regulating device has a fault. The pressure regulating device can be closed for repair, while the other group of pressure regulating devices can continue to work without affecting the work progress.

[0004] However, the patent still has the following problems: it adds a group of pressure regulating devices to the traditional pressure regulating device, that is, the number of pressure regulating devices is twice the original one, and generally the traditional gas supply station has multiple pressure regulating skid-mounted stations, which makes the cost twice the original one, and increases the space occupied by the equipment, requiring a larger land area for deployment, further increasing the land cost. Summary of the invention

[0005] The purpose of the present invention is to provide a large flow CNG pressure regulating device, which solves the technical problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions: A large-flow CNG pressure regulating device comprises two coaxially arranged pressure regulating pipes, one of which is connected to a heat exchanger, each of which is provided with a valve, a first pressure regulating part for regulating air pressure is commonly provided at opposite ends of the two pressure regulating pipes, an external movable part which can rotate and fix the position after rotation is provided on the two pressure regulating pipes, and the two valves are located between the two external movable parts, both of the external movable parts are detachably connected to an external pipe, a temporary pressure regulating part for regulating air pressure is commonly detachably connected to the two external pipes, each of the external pipes is provided with a support part, and the support part is used to support the temporary pressure regulating part for regulating air pressure.

[0007] As a preferred solution of the present invention, the external movable part includes a rotating sleeve rotatably connected to the pressure-regulating tube, and the rotating sleeve is sealingly connected to the outer wall of the pressure-regulating tube, the rotating sleeve is connected to a connecting tube, a sealing connector is provided on the connecting tube, and the external tube is detachably connected to the connecting tube via the sealing connector, a fixing component is provided on the rotating sleeve, and the fixing component is used to limit the rotation of the rotating sleeve, and an air outlet is opened on the pressure-regulating tube.

[0008] As a preferred solution of the present invention, the sealing connector comprises an annular bottom plate fixedly connected to the outer wall of the connecting pipe and coaxial with the connecting pipe, an annular seat is coaxially arranged on the annular bottom plate, two slides are slidably connected to the top of the annular seat, and semi-annular sealing plates for sealing the contact position between the end of the connecting pipe and the external pipe are fixedly connected to the opposite ends of the two slides, and the inner diameter of each of the semi-annular sealing plates is the same as the outer diameter of the connecting pipe, and a first externally threaded pipe for threaded connection with the external pipe is arranged on the top of the connecting pipe, and the maximum outer diameter of the first externally threaded pipe is smaller than the outer diameter of the external pipe; The outer diameter of the connecting pipe is the same as the outer diameter of the external pipe. When the two semi-ring sealing plates are attached to the outer wall of the connecting pipe and contact each other, the two semi-ring sealing plates are fixed by bolts.

[0009] As a preferred solution of the present invention, the fixing assembly includes an extension plate fixedly arranged on the outside of the rotating sleeve, a fixing rod is slidably inserted on the extension plate, a magnetic block is provided at the end of the fixing rod, two slots matching the magnetic blocks are provided on the outer wall of the rotating sleeve, and the magnetic blocks are attracted to the inner bottom of the slots through magnetic force, and when the magnetic blocks are respectively inserted into the two slots, the rotating sleeve is respectively in the position of closing the air outlet and opening the air outlet.

[0010] As a preferred solution of the present invention, the outer wall of the voltage regulating tube is rotatably connected to two limit plates, and the limit plates are used to limit the magnetic block from escaping from the slot.

[0011] As a preferred solution of the present invention, the temporary pressure regulating component includes two coaxial joint pipes respectively arranged on two external pipes, and the axis of the joint pipe is perpendicular to the axis of the external pipe. Each of the joint pipes is sealed with a sealed telescopic sleeve, and the two sealed telescopic sleeves are jointly provided with a second pressure regulating component with the same structure as the first pressure regulating component.

[0012] As a preferred solution of the present invention, the sealed telescopic sleeve includes a first pipe and a second pipe slidably sleeved inside the first pipe, and the second pressure regulating member is installed on the two second pipes, each end of the first pipe is rotatably connected to a rotating tube, and each of the rotating tubes is sealed and connected to the corresponding first pipe, each end of the rotating tube is provided with a second externally threaded tube for threaded connection with a joint pipe, and each end of the rotating tube and the end of the joint pipe are provided with a sealing gasket.

[0013] As a preferred solution of the present invention, the support member includes a movable sleeve rotatably sleeved on the external tube, the movable sleeve is fixedly connected to a threaded rod, the threaded rod is threadedly connected to a support sleeve rod, and one end of the support sleeve rod is fixedly connected to a base plate.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention installs a temporary pressure regulating part by arranging an external movable part on the pressure regulating pipe, so that normal gas supply can be guaranteed when a first pressure regulating part fails, and the external movable part, the external pipe and the temporary pressure regulating part can all be disassembled and can be used on different first pressure regulating parts, thereby reducing the volume of the entire device and reducing the equipment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0016] Figure 1 The present invention provides a structural schematic diagram of a large flow CNG pressure regulating device; Figure 2 A partial structural schematic diagram of an external movable part is provided for the present invention; Figure 3 A partial structural schematic diagram of a temporary pressure regulating component is provided for the present invention; Figure 4 The present invention provides Figure 1 A schematic diagram of the structure enlargement of part A shown in FIG. Figure 5The present invention provides Figure 1 The enlarged schematic diagram of the structure of part B shown in FIG. Figure 6 The present invention provides Figure 2 An enlarged schematic diagram of the structure of part C is shown in FIG.

[0017] The numbers in the figure represent the following: 1. Pressure regulating pipe; 2. First pressure regulating part; 3. External movable part; 4. External pipe; 5. Temporary pressure regulating part; 6. Support part; 301, rotating sleeve; 302, connecting pipe; 303, sealing connector; 304, fixing assembly; 305, air outlet; 306, annular bottom plate; 307, annular seat; 308, slide plate; 309, semi-ring sealing plate; 310, first externally threaded pipe; 311, extension plate; 312, fixing rod; 313, magnetic block; 314, slot; 315, limit plate; 501, joint pipe; 502, sealing telescopic sleeve; 503, second pressure regulating member; 504, first pipeline; 505, second pipeline; 506, rotating pipe; 507, second externally threaded pipe; 601, movable sleeve; 602, threaded rod; 603, supporting sleeve rod; 604, bottom plate. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] The following first describes the concepts involved in the present application in conjunction with the accompanying drawings. It should be noted that the following description of each concept is only to make the content of the present application easier to understand, and does not limit the scope of protection of the present application; at the same time, the embodiments and features in the embodiments of the present application can be combined with each other in the absence of conflict. The present application will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments.

[0020] like Figures 1 to 6As shown, the present invention provides a large-flow CNG pressure regulating device, including two coaxially arranged pressure regulating pipes 1, one of which is connected to a heat exchanger, each of which is provided with a valve, and the two pressure regulating pipes 1 are commonly provided with a first pressure regulating part 2 for regulating air pressure at opposite ends, and the two pressure regulating pipes 1 are each provided with an external movable part 3 that can rotate and fix the position after rotation, and the two valves are located between the two external movable parts 3, the two external movable parts 3 are both detachably connected with an external pipe 4, and the two external pipes 4 are commonly detachably connected with a temporary pressure regulating part 5 for regulating air pressure, and each of the external pipes 4 is provided with a support part 6, and the support part 6 is used to support the temporary pressure regulating part 5 for regulating air pressure.

[0021] When the present application is used, compressed natural gas enters the heat exchanger (the heat exchanger is not shown in the attached drawing, and the heat exchanger is the prior art) from the pressure regulating pipe 1 at one end of the first pressure regulating component 2 for heating, and the heated natural gas then enters the first pressure regulating component 2 for decompression, and is then output through another pressure regulating pipe 1. The output natural gas is metered and input into an external gas consumption system, and then decompressed again through a matching self-use gas system, and then input into the corresponding equipment. At this time, both valves are open to ensure the normal flow of natural gas.

[0022] In this embodiment, the first pressure regulating component 2 is a pressure regulator or a corresponding pressure reducing valve used in an existing gas supply station to adjust the natural gas pressure. This is the existing technology and its technical principle will not be elaborated in detail.

[0023] When the first pressure regulating component 2 fails after long-term use, the paths of the two pressure regulating pipes 1 leading to the first pressure regulating component 2 are respectively cut off by two valve bodies, and then the external pipe 4 is installed through the external movable part 3, and the temporary pressure regulating component 5 is installed on the external pipe 4, so that the whole device can operate normally and supply gas, and the first pressure regulating component 2 can be inspected and repaired, thereby ensuring the normal and continuous operation of the whole device, and the external pipe 4 and the temporary pressure regulating component 5 can be disassembled and can be used on other CNG pressure regulating devices, thereby avoiding the excessive size of the whole device, thereby reducing equipment and construction costs.

[0024] The support member 6 is used to support the external pipe 4 so that the temporary pressure regulating member 5 can operate stably.

[0025] The external movable part 3 includes a rotating sleeve 301 rotatably sleeved on the pressure regulating tube 1, and the rotating sleeve 301 is sealingly sleeved with the outer wall of the pressure regulating tube 1, the rotating sleeve 301 is connected with a connecting tube 302, the connecting tube 302 is provided with a sealing connector 303, and the external tube 4 is detachably connected to the connecting tube 302 through the sealing connector 303, the rotating sleeve 301 is provided with a fixing component 304, and the fixing component 304 is used to limit the rotation of the rotating sleeve 301, and the pressure regulating tube 1 is provided with an air outlet 305.

[0026] By rotating the rotating sleeve 301, the connecting pipe 302 is aligned with the gas outlet 305. At this time, when the valve is closed, the natural gas enters the connecting pipe 302 through the gas outlet 305, and then enters the external pipe 4 through the sealing connector 303, and finally enters the external pipe 4 at the other end after pressure regulation by the temporary pressure regulating component 5, and then enters the pressure regulating pipe 1 through the connecting pipe 302 and is output to the corresponding equipment.

[0027] In this embodiment, the end of the external pipe 4 away from the connecting pipe 302 is closed.

[0028] The fixing assembly 304 is used to fix the rotating sleeve 301 after the rotating sleeve 301 rotates.

[0029] When closing the air outlet 305, rotate the rotating sleeve 301 so that the connecting pipe 302 is offset from the air outlet 305. At this time, the inner wall of the rotating sleeve 301 closes the air outlet 305. Then, after fixing the rotating sleeve 301 by the fixing assembly 304, the external pipe 4 and the temporary pressure regulating component 5 can be removed.

[0030] The sealing connector 303 includes an annular base plate 306 fixedly connected to the outer wall of the connecting tube 302 and coaxial with the connecting tube 302, an annular seat 307 is coaxially arranged on the annular base plate 306, and two slides 308 are slidably connected to the top of the annular seat 307, and the opposite ends of the two slides 308 are fixedly connected with semi-annular sealing plates 309 for sealing the contact position between the end of the connecting tube 302 and the external tube 4, and the inner diameter of each semi-annular sealing plate 309 is the same as the outer diameter of the connecting tube 302, and a first externally threaded tube 310 for threaded connection with the external tube 4 is arranged on the top of the connecting tube 302, and the maximum outer diameter of the first externally threaded tube 310 is smaller than the outer diameter of the external tube 4.

[0031] The outer diameter of the connecting pipe 302 is the same as the outer diameter of the external pipe 4. When the two semi-ring sealing plates 309 are attached to the outer wall of the connecting pipe 302 and contact each other, the two semi-ring sealing plates 309 are fixed by bolts.

[0032] The external pipe 4 is threadedly connected to the first external threaded pipe 310 until the end of the external pipe 4 abuts against the end of the connecting pipe 302, and then the two slide plates 308 are slid until the two semi-ring sealing plates 309 are in contact to form a complete ring, and the two semi-ring sealing plates 309 are in contact with the outer wall of the connecting pipe 302, and at the same time, the two semi-ring sealing plates 309 are in contact with the outer wall of the external pipe 4, and finally the two semi-ring sealing plates 309 are fixed by bolts to form a whole, so that the contacting ends of the connecting pipe 302 and the external pipe 4 are located inside the semi-ring sealing plates 309, so that the contacting ends of the connecting pipe 302 and the external pipe 4 are sealed by the two semi-ring sealing plates 309, thereby avoiding leakage of natural gas.

[0033] Furthermore, rubber sealing rings are provided at the contacting ends of the connecting pipe 302 and the external pipe 4 to further improve the sealing effect.

[0034] The fixing assembly 304 includes an extension plate 311 fixedly arranged on the outside of the rotating sleeve 301, a fixing rod 312 is slidably inserted on the extension plate 311, a magnetic block 313 is provided at the end of the fixing rod 312, and two slots 314 adapted to the magnetic blocks 313 are provided on the outer wall of the rotating sleeve 301, and the magnetic blocks 313 are attracted to the inner bottom of the slots 314 through magnetic force. When the magnetic blocks 313 are respectively connected with the two slots 314, the rotating sleeve 301 is respectively in the position of closing the air outlet 305 and opening the air outlet 305.

[0035] When rotating the rotating sleeve 301, pull the fixing rod 312 to slide on the extension plate 311, so that the magnetic block 313 is disengaged from the slot 314. At this time, the rotating sleeve 301 can be rotated. After the magnetic block 313 is aligned with another slot 314, the fixing rod 312 is pushed and inserted into the corresponding slot 314, so that the magnetic block 313 and the inner bottom of the slot 314 are attracted to each other, thereby fixing the magnetic block 313 in the slot 314 and limiting the rotation of the rotating sleeve 301. At this time, the connecting pipe 302 is connected to the air outlet 305 or the rotating sleeve 301 closes the air outlet 305.

[0036] The outer wall of the voltage regulating tube 1 is rotatably connected to two limit plates 315 , and the limit plates 315 are used to limit the magnetic block 313 from being separated from the slot 314 .

[0037] By rotating the limiting plate 315 to the notch of the slot 314 , the magnetic block 313 can be restricted from being separated from the slot 314 .

[0038] The temporary pressure regulating component 5 includes two coaxial joint pipes 501 respectively arranged on two external tubes 4, and the axis of the joint pipe 501 is perpendicular to the axis of the external tube 4. Each joint pipe 501 is sealed and connected with a sealed telescopic sleeve 502, and the two sealed telescopic sleeves 502 are jointly provided with a second pressure regulating component 503 with the same structure as the first pressure regulating component 2.

[0039] The sealed telescopic sleeve 502 includes a first pipe 504 and a second pipe 505 slidably sleeved inside the first pipe 504, and the second pressure regulating member 503 is installed on the two second pipes 505, each end of the first pipe 504 is rotatably connected with a rotating tube 506, and each rotating tube 506 is sealed and connected to the corresponding first pipe 504, and each end of the rotating tube 506 is provided with a second externally threaded tube 507 for threaded connection with the joint pipe 501, and the ends of each rotating tube 506 and the ends of the joint pipe 501 are provided with sealing gaskets.

[0040] The natural gas enters the joint pipe 501 through the external pipe 4, then enters the second pressure regulating component 503 to adjust the pressure, and then is output to the pressure regulating pipe 1 through the joint pipe 501 and the external pipe 4 at the other end, and then output to the inside of the corresponding equipment.

[0041] During installation, the rotating tube 506 is rotated so that the second externally threaded tube 507 is threadedly connected to the joint tube 501 until the end of the rotating tube 506 abuts against the end of the joint tube 501, and the contact position between the rotating tube 506 and the joint tube 501 is sealed by a sealing gasket to prevent natural gas leakage.

[0042] The first pipe 504 and the second pipe 505 are slidably connected to each other, so that the space between the two second pipes 505 can be adjusted to facilitate the installation of the second pressure regulating member 503.

[0043] In this embodiment, the second pressure regulating member 503 is the same as the first pressure regulating member 2 .

[0044] The support member 6 includes a movable sleeve 601 rotatably sleeved on the external pipe 4 , a threaded rod 602 is fixedly connected to the movable sleeve 601 , a support sleeve rod 603 is threadedly connected to the threaded rod 602 , and one end of the support sleeve rod 603 is fixedly connected to a bottom plate 604 .

[0045] The movable sleeve 601 is rotated to rotate the threaded rod 602 and the support sleeve rod 603 to corresponding positions, and then the support sleeve rod 603 is rotated until the bottom plate 604 contacts the ground, thereby stably supporting the external pipe 4 and ensuring the stability of the temporary pressure regulating member 5 when in use.

[0046] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any form. Any technical personnel in this field may make slight changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as technologies or embodiments that are essentially the same as the present invention.

[0047] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the invention to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A large flow CNG pressure regulating device, comprising two coaxially arranged pressure regulating pipes (1), wherein one of the pressure regulating pipes (1) is connected to a heat exchanger, and each of the pressure regulating pipes (1) is provided with a valve, characterized in that: A first pressure regulating member (2) for regulating air pressure is commonly provided at opposite ends of the two pressure regulating pipes (1); an external movable member (3) capable of rotating and fixing the position after rotation is commonly provided on the two pressure regulating pipes (1); the two valves are located between the two external movable members (3); an external pipe (4) is detachably connected to the two external movable members (3); a temporary pressure regulating member (5) for regulating air pressure is commonly detachably connected to the two external pipes (4); a support member (6) is commonly provided on each of the external pipes (4); and the support member (6) is used to support the temporary pressure regulating member (5) for regulating air pressure.

2. A large flow CNG pressure regulating device according to claim 1, characterized in that: The external movable part (3) comprises a rotating sleeve (301) rotatably sleeved on the pressure regulating pipe (1), and the rotating sleeve (301) is sealingly sleeved with the outer wall of the pressure regulating pipe (1), the rotating sleeve (301) is connected to a connecting pipe (302), the connecting pipe (302) is provided with a sealing connecting piece (303), and the external pipe (4) is detachably connected to the connecting pipe (302) via the sealing connecting piece (303), the rotating sleeve (301) is provided with a fixing component (304), and the fixing component (304) is used to limit the rotation of the rotating sleeve (301), and the pressure regulating pipe (1) is provided with an air outlet (305).

3. A large flow CNG pressure regulating device according to claim 2, characterized in that: The sealing connection piece (303) comprises an annular bottom plate (306) fixedly connected to the outer wall of the connecting pipe (302) and coaxial with the connecting pipe (302); an annular seat (307) is coaxially arranged on the annular bottom plate (306); two slide plates (308) are slidably connected to the top of the annular seat (307); semi-annular sealing plates (309) for sealing the contact position between the end of the connecting pipe (302) and the external pipe (4) are fixedly connected to the opposite ends of the two slide plates (308); the inner diameter of each semi-annular sealing plate (309) is the same as the outer diameter of the connecting pipe (302); a first externally threaded pipe (310) for threaded connection with the external pipe (4) is arranged on the top of the connecting pipe (302); and the maximum outer diameter of the first externally threaded pipe (310) is smaller than the outer diameter of the external pipe (4); The outer diameter of the connecting pipe (302) is the same as the outer diameter of the external pipe (4), and when the two semi-ring sealing plates (309) are attached to the outer wall of the connecting pipe (302) and contact each other, the two semi-ring sealing plates (309) are fixed by bolts.

4. A large flow CNG pressure regulating device according to claim 2, characterized in that: The fixing assembly (304) comprises an extension plate (311) fixedly arranged on the outside of the rotating sleeve (301), a fixing rod (312) being slidably inserted on the extension plate (311), a magnetic block (313) being provided at the end of the fixing rod (312), two slots (314) matching the magnetic blocks (313) being provided on the outer wall of the rotating sleeve (301), and the magnetic blocks (313) being attracted to the inner bottom of the slots (314) by magnetic force, and when the magnetic blocks (313) are respectively inserted into the two slots (314), the rotating sleeve (301) is respectively in the position of closing the air outlet (305) and opening the air outlet (305).

5. A large flow CNG pressure regulating device according to claim 4, characterized in that: The outer wall of the voltage regulating tube (1) is rotatably connected to two limit plates (315), and the limit plates (315) are used to limit the magnetic block (313) from escaping from the slot (314).

6. A large flow CNG pressure regulating device according to claim 1, characterized in that: The temporary pressure regulating component (5) comprises two coaxial joint pipes (501) respectively arranged on two external pipes (4), wherein the axis of the joint pipe (501) is perpendicular to the axis of the external pipe (4), each of the joint pipes (501) is sealedly connected to a sealed telescopic sleeve (502), and the two sealed telescopic sleeves (502) are jointly provided with a second pressure regulating component (503) having the same structure as the first pressure regulating component (2).

7. A large flow CNG pressure regulating device according to claim 6, characterized in that: The sealed telescopic sleeve (502) comprises a first pipe (504) and a second pipe (505) slidably sleeved inside the first pipe (504), and the second pressure regulating member (503) is installed on the two second pipes (505), the end of each of the first pipes (504) is rotatably connected to a rotating tube (506), and each of the rotating tubes (506) is sealedly connected to the corresponding first pipe (504), the end of each of the rotating tubes (506) is provided with a second externally threaded tube (507) for threaded connection with the joint pipe (501), and the end of each of the rotating tubes (506) and the end of the joint pipe (501) are provided with a sealing gasket.

8. A large flow CNG pressure regulating device according to claim 1, characterized in that: The support member (6) comprises a movable sleeve (601) rotatably sleeved on the external pipe (4); a threaded rod (602) is fixedly connected to the movable sleeve (601); a support sleeve rod (603) is threadedly connected to the threaded rod (602); and one end of the support sleeve rod (603) is fixedly connected to a bottom plate (604).

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