Multi-stage self-operated pressure reducing device

Abstract

The multistage self-operated pressure reducing device comprises a valve body and a pressure adjusting assembly, a pressure adjusting cavity, a gas inflow channel and a gas outflow channel are formed in the valve body, the pressure adjusting cavity comprises a balance cavity, an adjusting cavity and a connecting channel, and the two ends of the connecting channel communicate with the balance cavity and the adjusting cavity; the pressure adjusting assembly comprises a valve element and a pressure adjusting elastic piece, the two ends of the valve element are located in the balance cavity and the adjusting cavity respectively and communicated through a gas balance channel, the pressure adjusting elastic piece is supported at the end located in the balance cavity, and the area of the pressed end face of the pressure adjusting elastic piece is smaller than that of the pressed end face of the end located in the adjusting cavity. When the thrust generated by the air pressure in the balance cavity is larger than the supporting force of the pressure adjusting elastic piece, the first end is pushed to move towards the interior of the adjusting cavity, so that the space of the adjusting cavity is reduced, the flow speed of the air flow is reduced, and the technical problem that a traditional air pressure reducing valve cannot well reduce and stabilize the dynamic input air pressure is solved.

Description

Technical Field

[0001] The invention relates to the field of high-pressure gas pressure reducing valves, and more particularly to a multi-stage self-operated pressure reducing device. Background Art

[0002] In the prior art, a gas pressure reducing valve is a device specifically used to automatically reduce the working pressure of a pipeline. It can reduce the higher gas pressure in the pipeline before the valve to the required level of the pipeline after the valve. This type of valve is crucial in applications that require safe, precise and stable control of hydrogen pressure. If the pressure reducing valve fails to reduce the high-pressure gas to a safe level, the excessive pressure may damage downstream components or pipelines, cause leakage, and increase the risk of explosion or fire.

[0003] Traditional gas pressure reducing valves can only reduce the air pressure within a limited range, and the output air pressure fluctuates with the fluctuation of the input air pressure. They cannot effectively reduce and stabilize the pressure when facing dynamic air pressure.

[0004] Therefore, how to provide a new multi-stage self-operated pressure reducing device with adaptive air pressure regulation, wide regulation range and stable output is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] In view of this, the present invention provides a multi-stage self-operated pressure reducing device, which aims to solve the technical problem that the above-mentioned traditional gas pressure reducing valve cannot well reduce and stabilize the dynamic input gas pressure.

[0006] A pressure reducing device, comprising: a valve body and a pressure regulating assembly, wherein the valve body is provided with a sealed pressure regulating chamber, a gas inlet channel and a gas outlet channel, wherein the pressure regulating chamber comprises a balancing chamber and a regulating chamber arranged opposite to each other and a connecting channel located between the balancing chamber and the regulating chamber, wherein both ends of the connecting channel are connected to the balancing chamber and the regulating chamber;

[0007] The pressure regulating assembly includes a valve core and a pressure regulating elastic member, the valve core includes a core body and a first end head and a second end head connected at both ends of the core body, the core body is sealed and slidable in the connecting channel, the first end head is telescopically located in the regulating cavity, and a pressure reducing channel is formed between the telescopic end face thereof and the inner wall surface of the regulating cavity, and the outlet of the gas inlet channel and the inlet of the gas outlet channel are connected to the pressure reducing channel;

[0008] The second end head slides in the balancing cavity, and a through gas balancing channel is opened in the first end head, the core body and the second end head. The gas balancing channel connects the balancing cavity and the regulating cavity. The area of ​​the pressure-bearing end face of the first end head is smaller than the area of ​​the pressure-bearing end face of the second end head; the pressure regulating elastic piece is sleeved on the core body located in the balancing cavity to apply elastic force to the second end head in a direction away from the regulating cavity.

[0009] Through the above technical scheme, the present invention connects the first end and the second end of the valve core through a gas balance channel, so that the air pressure in the regulating chamber where the first end is located is the same as the air pressure in the balance chamber where the second end is located. Because the area of ​​the pressure-bearing end surface of the first end is smaller than the area of ​​the pressure-bearing end surface of the second end, the air pressure in the balance chamber generates a thrust on the second end. When the air pressure exceeds a preset value, the thrust generated by the air pressure in the balance chamber is greater than the sum of the supporting force of the pressure regulating elastic member and the thrust of the air pressure in the regulating chamber on the first end, the first end will be pushed toward the regulating chamber to reduce the width of the pressure reducing channel, resulting in an increase in flow rate and thus a reduction in air pressure. The air pressure is automatically adjusted and the output is stable.

[0010] Preferably, the pressure-bearing end surfaces of the first end and the second end and the pressure regulating elastic member are configured so that when the gas pressure in the regulating chamber exceeds a preset value, the gas pressure in the balance chamber pushes the second end to drive the first end to move to reduce the airflow section of the pressure reducing channel.

[0011] Preferably, the first end is in the shape of a frustum, a frustum groove is provided on a side of the regulating cavity opposite to the first end, and a gap between the first end and the frustum groove is a pressure relief channel.

[0012] Preferably, when the pressure regulating elastic member is in its fully compressed state, there is a minimum gap between the first end and the frustum groove.

[0013] Preferably, the second end is a disc-shaped structure, one end face of which is connected to the core body, and the other end face is a pressure end face, and the outer annular surface of the disc-shaped structure is sealingly and slidingly connected to the inner wall surface of the balance cavity.

[0014] Preferably, the pressure regulating elastic member is sleeved on the core body and its two ends abut against the inner wall surfaces opposite to the disc-shaped structure and the balancing cavity.

[0015] Preferably, the pressure regulating chambers and the pressure regulating components are in multiple groups and are evenly arranged in the circumferential direction along a plane perpendicular to the gas transmission direction.

[0016] Preferably, a diverting channel and a collecting channel are further provided in the valve body, the gas inlet channel is connected to the multiple regulating chambers through the diverting channel, and the gas outlet channel is connected to the multiple regulating chambers through the collecting channel.

[0017] A multi-stage self-operated pressure reducing device comprises a plurality of the above pressure reducing devices, wherein the plurality of pressure reducing devices are arranged in sequence along the air flow direction, and the flow dividing channels and the collecting channels of two adjacent pressure reducing devices are connected through a connecting channel.

[0018] Through the above technical solution, the present invention arranges multiple pressure reducing devices in sequence along the air flow direction, so that the air pressure can be reduced and stabilized step by step, and the pressure threshold of the gas output is lower and more stable.

[0019] Preferably, the elastic force of the pressure regulating elastic members of the multiple pressure reducing devices along the gas transmission direction is gradually reduced.

[0020] Preferably, the valve body of the pressure reducing device includes an outer valve cylinder and multiple inner valve cylinders, the outer valve cylinder is a columnar structure, the multiple outer valve cylinders are integrally formed, and an assembly cavity is opened in the axial direction. The multiple inner valve cylinders are sequentially fastened and assembled in the assembly cavity, and the pressure regulating cavity is correspondingly opened in the outer valve cylinder and the inner valve cylinder; multiple groups of pressure regulating components correspond to the pressure regulating cavity one by one.

[0021] It can be seen from the above technical solution that, compared with the prior art, the present invention discloses a multi-stage self-powered pressure reducing device, which has the following beneficial effects: the width of the pressure reducing channel is adjusted under the influence of the pressure in the pressure reducing channel, and when the pressure exceeds a preset value, the air pressure in the balancing chamber pushes the second end of the valve core toward the regulating chamber, thereby reducing the width of the pressure reducing channel and reducing the air pressure in the pressure reducing channel. When the air pressure in the pressure reducing channel is reduced to a preset value, the thrust generated by the air pressure in the balancing chamber is insufficient to counteract the thrust of the pressure regulating elastic member and the air pressure in the regulating chamber on the first end, and the width of the pressure reducing channel is increased, thereby increasing the air pressure in the pressure reducing channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A three-dimensional schematic diagram of a multi-stage self-operated pressure reducing device provided by the present invention;

[0023] Figure 2 An exploded schematic diagram of a multi-stage self-operated pressure reducing device provided by the present invention in a partial cross-sectional view;

[0024] Figure 3 for Figure 2 A partial enlarged view of point A;

[0025] Figure 4 for Figure 2 A partial enlarged view of point C;

[0026] Figure 5 A three-dimensional schematic diagram of a valve core provided by the present invention;

[0027] Figure 6 A front view of the valve core provided by the present invention;

[0028] Figure 7 for Figure 6 BB cross-sectional view;

[0029] Figure 8 An exploded schematic diagram of a valve body provided by the present invention;

[0030] Fig. 9 A partial cross-sectional view of the outer valve cylinder provided by the present invention;

[0031] Fig.10A three-dimensional schematic diagram of an inner valve cylinder 1 provided by the present invention;

[0032] Fig.11 A front view of the inner valve cylinder 1 provided by the present invention;

[0033] Fig.12 for Fig.11 DD cross-sectional view;

[0034] Fig.13 for Fig.11 EE cross-sectional view;

[0035] Fig.14 for Fig.11 FF cross-sectional view;

[0036] Fig.15 A three-dimensional schematic diagram of the inner valve cylinder 2 provided by the present invention;

[0037] Fig.16 A front view of the second inner valve cylinder provided by the present invention;

[0038] Fig.17 for Fig.16 GG cross-sectional view;

[0039] Fig.18 for Fig.16 HH cross-sectional view;

[0040] Fig.19 for Fig.16 MM cross-sectional view;

[0041] Fig. 20 A three-dimensional schematic diagram of the inner valve cylinder 4 provided by the present invention;

[0042] Fig.21 A front view of the inner valve cylinder body 4 provided by the present invention;

[0043] Fig. 22 for Fig.21 NN cross-sectional view;

[0044] Fig.23 for Fig.21 PP cross-sectional view;

[0045] Fig.24 for Fig.21 SS cross-sectional view;

[0046] Among them: 1-valve body; 2-pressure regulating assembly; 3-thrust valve cover; 12-outer valve column; 13-inner valve column; 14-valve cover; 21-valve core; 22-pressure regulating elastic member; 23-sealing ring; 111-balance chamber; 112-regulating chamber; 121-assembly chamber; 122-valve cover installation groove; 123-pressure regulating groove; 124-connecting channel; 125-mounting platform; 131-first inner valve column; 132-second inner valve column; 133-third inner valve column; 134-fourth inner valve column; 135-1-cone groove one; 135-2-cone groove two; 135-4-cone groove four; 136-1-diverter channel one; 136-2-diverter channel two; 1 36-4-diverter channel four; 137-1-collecting channel one; 137-2-collecting channel two; 137-4-collecting channel four; 138-1-connecting channel one; 138-2-connecting channel two; 138-3-connecting channel three; 138-6-connecting channel four; 139-1-connecting groove one; 139-2-connecting groove two; 139-4-connecting groove four; 211-first end; 212-second end; 213-disc-shaped structure; 214-gas balance channel; 1311-gas inlet channel; 1315-threaded column one; 1325-threaded column two; 1326-threaded hole one; 1341-gas outlet channel; 1345-threaded hole three. DETAILED DESCRIPTION

[0047] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0048] See attached Figure 1-7 The embodiment of the present invention discloses a multi-stage self-acting pressure reducing device, comprising: a valve body 1 and a pressure regulating assembly 2, wherein a closed pressure regulating chamber, a gas inlet channel 1311 and a gas outlet channel 1341 are provided in the valve body 1, the pressure regulating chamber comprises a balancing chamber 111 and a regulating chamber 112 arranged opposite to each other, and a connecting channel 124 located between the balancing chamber 111 and the regulating chamber 112, and both ends of the connecting channel 124 are connected to the balancing chamber 111 and the regulating chamber 112;

[0049] The pressure regulating assembly 2 includes a valve core and a pressure regulating elastic member 22. The valve core includes a core body 21 and a first end head and a second end head connected to both ends of the core body 21. The core body 21 is sealed and slidable in the connecting channel 124. The first end head 211 is telescopically located in the regulating chamber 112 and a pressure reducing channel is formed between its telescopic end face and the inner wall surface of the regulating chamber 112. The outlet of the gas inlet channel 1311 and the inlet of the gas outlet channel 1341 are connected to the pressure reducing channel.

[0050] The second end head 212 slides in the balancing chamber 111, and a through gas balancing channel 214 is provided in the first end head 211, the core body 21 and the second end head 212. The gas balancing channel 214 connects the balancing chamber 111 and the regulating chamber 112. The area of ​​the pressure-bearing end face of the first end head 211 is smaller than the area of ​​the pressure-bearing end face of the second end head 212. The pressure regulating elastic member 22 is sleeved on the core body 21 located in the balancing chamber 111 to apply elastic force to the second end head 212 in a direction away from the regulating chamber 112.

[0051] In some embodiments, the pressure-bearing end surfaces of the first end head 212 and the second end head 212 and the pressure regulating elastic member 22 are configured so that when the gas pressure in the regulating chamber 112 exceeds a preset value, the gas pressure in the balancing chamber 111 pushes the second end head 212 to drive the first end head 211 to move to reduce the airflow cross-section of the pressure reducing channel.

[0052] In other embodiments, the first end 211 is in a frustum shape, a frustum groove 135 is provided on a side of the regulating chamber 112 opposite to the first end 211, and a gap between the first end 211 and the frustum groove 135 is a pressure relief channel.

[0053] Specifically, the first end 211 is in the shape of a frustum, and the frustum surface thereof is in clearance with the groove wall surface and the groove bottom surface of the frustum groove 135 .

[0054] In one embodiment, when the pressure regulating elastic member 22 is in its fully compressed state, there is a minimum gap between the first end 211 and the frustum groove 135 .

[0055] In one embodiment, the second end 212 is a disc-shaped structure, one end face of which is connected to the core 21 , and the other end face is a pressure end face, and the outer annular surface of the disc-shaped structure is sealingly and slidingly connected to the inner wall surface of the balancing cavity 111 .

[0056] Specifically, it also includes a support column 213, which is coaxially arranged with the core 21, and whose first end is tightly connected to the pressure end face of the disc-shaped structure, and both ends of the gas balance channel 214 penetrate the second end of the support column 213 and the first end 211 of the core 21. Thus, the contact area between the end face of the second end 212 of the disc-shaped structure and the balance cavity 111 can be reduced by the support column 213 to avoid adhesion.

[0057] In some embodiments, the pressure regulating elastic member 22 is sleeved on the core 21 and two ends thereof abut against the inner wall surfaces of the disc-shaped structure and the balancing chamber 111 opposite to each other.

[0058] In this embodiment, there are multiple groups of pressure regulating chambers and pressure regulating components 2, and they are evenly arranged in the circumferential direction along a plane perpendicular to the gas transmission direction.

[0059] In some specific embodiments, a shunt channel 136 and a collection channel 137 are further provided in the valve body, and the gas inlet channel 1311 is connected to the multiple regulating chambers 112 through the shunt channel 136, and the gas outlet channel 1341 is connected to the multiple regulating chambers 112 through the collection channel 137. Thus, the collection channel 137 can offset the high-velocity gas flows adjusted by the multiple regulating chambers 112 during the collection process, and greatly reduce the kinetic energy and dynamic pressure of the gas flow through the offset.

[0060] See attached Figure 8-24 The embodiment of the present invention also discloses a multi-stage self-powered pressure reducing device, comprising a plurality of the above-mentioned pressure reducing devices, wherein the plurality of pressure reducing devices are arranged in sequence along the air flow direction, and the diversion channels 136 and the collecting channels 137 of two adjacent pressure reducing devices are connected through a connecting channel 138.

[0061] In some specific embodiments, the elastic force of the pressure regulating elastic members 22 of the plurality of pressure reducing devices along the gas transmission direction is gradually reduced, thereby enabling more accurate control of the gradually reduced gas pressure.

[0062] Specifically, the pressure regulating elastic member 22 is a spring.

[0063] In other specific embodiments, the valve body 1 of the pressure reducing device includes an outer valve cylinder 12 and a plurality of detachable inner valve cylinders 13, the outer valve cylinder 12 is a columnar structure, an assembly cavity 121 is provided in its axial direction, a plurality of inner valve cylinders 13 are fastened and assembled in sequence in the assembly cavity 121, and pressure regulating cavities are correspondingly provided in the outer valve cylinder 12 and the inner valve cylinder 13; a plurality of groups of pressure regulating components 2 correspond one by one to the pressure regulating cavities.

[0064] Specifically, the outer valve column 12 is a square column structure.

[0065] Specifically, the assembly cavity 121 passes through the upper and lower ends of the outer valve cylinder 12 along the center line of the outer valve cylinder 12 .

[0066] Specifically, it also includes a valve cover 14, the interior of the valve cover 14 is hollow and has an opening at one end, an outer wall surface of the outer valve cylinder 12 is provided with a valve cover mounting groove 122 in a direction perpendicular to its center line, the outer wall surface of the valve cover 14 is sealed and tightly connected with the inner wall surface of the valve cover mounting groove 122, the inner wall surface of the valve cover 14 and the bottom surface of the valve cover mounting groove 122 constitute a balancing chamber 111, and the outer annular surface of the second end head 212 of the disc-shaped structure is sealed and slidably connected with the inner wall surface of the valve cover 14.

[0067] Specifically, it also includes a sealing ring 23, the inner wall surface of the assembly cavity 121 is provided with a pressure regulating groove 123 arranged opposite to the valve cover mounting groove 122, the valve cover mounting groove 122 and the pressure regulating groove 123 are connected through a connecting channel 124, the outer ring surface of the sealing ring 23 is sealed and fastened with the side wall surface of the pressure regulating groove 123, and its inner ring surface is sealed and slidably connected with the outer wall surface of the valve core 21, and one end of the sealing ring 23 located at the opening of the pressure regulating groove 123 is provided with a V-shaped ring groove along its circumferential direction. Therefore, when the air pressure is charged, the two side walls of the V-shaped ring groove expand and open in opposite directions to maintain the dynamic seal of the valve core.

[0068] Specifically, the number of pressure regulating chambers is 16, which are divided into 4 levels and arranged in an array along the gas transmission direction, wherein the 4 pressure regulating chambers in each group are arranged in a circular array about the axis of the outer valve cylinder 12 and are respectively arranged on the four side wall surfaces of the outer valve cylinder 12.

[0069] Specifically, the assembly cavity 121 is square and arranged corresponding to the outer wall surface of the outer valve cylinder 12, and the inner valve cylinder 13 includes an inner valve cylinder 1 131, an inner valve cylinder 2 132, an inner valve cylinder 3 133 and an inner valve cylinder 4 134, which are all square. The inner valve cylinder 1 131, the inner valve cylinder 2 132, the inner valve cylinder 3 133 and the inner valve cylinder 4 134 are arranged in sequence according to the transmission direction of the gas;

[0070] Specifically, the four side wall surfaces of the inner valve cylinder 131 are all provided with a frustum groove 135-1 arranged opposite to the pressure regulating groove 123, and a connecting groove 139-1 is arranged around the frustum groove 135-1; the top of the inner valve cylinder 131 is provided with a gas inlet channel 1311, and the gas inlet channel 1311 is coaxially arranged with the inner valve cylinder 131, and one end thereof is exposed to the outside at the top of the inner valve cylinder 131, and the other end is connected to the gas outlet. A diversion channel 136-1 is respectively connected to the four connecting grooves 139-1; a threaded column 1315 is coaxially arranged and tightly connected to the bottom end of the inner valve cylinder 131, and a connecting channel 138-1 which is coaxially arranged with the inner valve cylinder 131 and has one end exposed to the outside of the end face is provided on the end face of the threaded column 1315, and the other end of the connecting channel 138-1 is connected to a collecting channel 137-1 which is respectively connected to the four connecting grooves 139-1.

[0071] More specifically, the frustum groove 135-1 of the inner valve cylinder 131 is arranged opposite to the first-stage pressure regulating chamber.

[0072] Specifically, the four side walls of the second inner valve cylinder 132 are all provided with a second cone groove 135-2 arranged opposite to the pressure regulating groove 123, and a second connecting groove 139-2 is provided around the second cone groove 135-2; the top of the second inner valve cylinder 132 is provided with a coaxially arranged threaded hole 1326, and the threaded column 1315 is spirally connected to the threaded hole 1326; the bottom surface of the threaded hole 1326 is provided with a second connecting channel 138-2, and the connecting channel 138-2 is coaxially arranged with the second inner valve cylinder 132 The inner valve cylinder 132 is coaxially arranged with one end thereof exposed at the bottom surface of the threaded hole 1326, and the other end thereof is connected with a diversion channel 136-2 respectively connected with the four connecting grooves 139-2. A threaded column 1325 is coaxially arranged and tightly connected with the bottom end of the inner valve cylinder 132. A connecting channel 138-3 is coaxially arranged and one end thereof is exposed at the end surface. The other end of the connecting channel 138-3 is connected with a collecting channel 137-2 respectively connected with the four connecting grooves 139-2.

[0073] More specifically, the second frustum groove 135-2 of the second inner valve cylinder 132 is arranged opposite to the second-stage pressure regulating chamber.

[0074] Specifically, the structure of the inner valve cylinder body 3 133 is the same as that of the inner valve cylinder body 2 132 , and the threaded cylinder body 2 1325 at the bottom end of the inner valve cylinder body 2 132 is spirally connected to the threaded hole at the top end of the inner valve cylinder body 3 133 .

[0075] More specifically, the frustum groove of the inner valve cylinder body 133 is arranged opposite to the third-stage pressure regulating chamber.

[0076] Specifically, four sidewall surfaces of the inner valve cylinder body 134 are provided with four frustum grooves 135-4 arranged opposite to the pressure regulating groove 123, and four connecting grooves 139-4 are provided around the four frustum grooves 135-4; a coaxially arranged threaded hole 1345 is provided at the top of the inner valve cylinder body 134, and a threaded column at the bottom end of the inner valve cylinder body 133 is spirally connected to the threaded hole 1345; a connecting channel 138-6 is provided on the bottom surface of the threaded hole 1345, and a connecting channel 138-6 is provided to connect the inner valve cylinder body 1345 to the pressure regulating groove 123; The connecting channel four 138-6 is coaxially arranged with the inner valve cylinder four 134, and one end thereof is exposed to the bottom surface of the threaded hole three 1345, and the other end thereof is connected to the diversion channel four 136-4 which are respectively connected to the four connecting grooves four 139-4. The bottom end of the inner valve cylinder two 132 is provided with a gas outlet channel 1341 which is coaxially arranged and one end of which is exposed to the end surface thereof, and the other end of the gas outlet channel 1341 is connected to the collecting channel four 137-4 which are respectively connected to the four connecting grooves four 139-4.

[0077] More specifically, the frustum groove of the inner valve cylinder body 134 is arranged opposite to the fourth-stage pressure regulating chamber.

[0078] Specifically, it also includes a thrust valve cover 3, the bottom end of the outer valve cylinder 12 has a mounting platform 125, one end of the thrust valve cover 3 is provided with a mounting groove, the side wall surface of the mounting groove is spirally connected to the side wall surface of the mounting platform 125, the bottom surface of the mounting groove is in contact with the bottom end of the inner valve cylinder 134, and the bottom surface of the mounting groove is provided with an exhaust hole corresponding to the gas outlet channel 1341. In this way, the bottom end of the inner valve cylinder 134 can be supported.

[0079] The specific principle and use method of a multi-stage self-operated pressure reducing device provided in this embodiment are as follows:

[0080] 1. The gas flows into the pressure reducing device through the gas inlet channel 1311, and enters the four regulating chambers 112 through the branch channel 1 136-1 respectively;

[0081] 2. Since the air pressure in the regulating chamber 112 is connected to the balancing chamber 111 through the gas balancing channel 214, and the area of ​​the pressure-bearing end surface of the first end head 211 is smaller than the area of ​​the pressure-bearing end surface of the second end head 212, the pressure on the second end head 212 in the balancing chamber 111 is greater than the pressure on the first end head 211 in the regulating chamber 112. When the air pressure in the regulating chamber 112 exceeds a preset value, the pressure on the second end head 212 compresses the spring, and the first end head 211 moves in a direction away from the balancing chamber 111, thereby reducing the gap of the decompression channel, increasing the air flow speed, and reducing the air pressure;

[0082] 3. The high-speed airflow passing through the pressure-reducing channel flows into the connecting channel 138-1 through the collecting channel 137-1. In the process of multiple channels being collected into one pipeline, the airflows collide with each other, which greatly reduces the kinetic energy and dynamic pressure of the gas.

[0083] 4. The airflow undergoes multiple stages of decompression in sequence and is discharged from the gas outlet channel 1341.

[0084] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure reducing device, characterized in that: include: A valve body (1) and a pressure regulating assembly (2), wherein the valve body (1) is provided with a sealed pressure regulating chamber, a gas inlet channel (1311) and a gas outlet channel (1341), the pressure regulating chamber comprising a balancing chamber (111) and a regulating chamber (112) arranged opposite to each other, and a connecting channel (124) located between the balancing chamber (111) and the regulating chamber (112), and the connecting channel (124) is connected at both ends to the balancing chamber (111) and the regulating chamber (112); The pressure regulating assembly (2) comprises a valve core and a pressure regulating elastic member (22); the valve core comprises a core body (21) and a first end head (211) and a second end head (212) connected to two ends of the core body (21); the core body (21) is sealed and slidable in the connecting channel (124); the first end head (211) is telescopically located in the regulating cavity (112) and a pressure reducing channel is formed between its telescopic end face and the inner wall surface of the regulating cavity (112); the outlet of the gas inlet channel (1311) and the inlet of the gas outlet channel (1341) are connected to the pressure reducing channel; The second end head (212) slides in the balancing chamber (111); a through gas balancing channel (214) is provided in the first end head (211), the core body (21) and the second end head (212); the gas balancing channel (214) connects the balancing chamber (111) and the regulating chamber (112); the area of ​​the pressure-bearing end face of the first end head (211) is smaller than the area of ​​the pressure-bearing end face of the second end head (212); the pressure regulating elastic member (22) is sleeved on the core body (21) located in the balancing chamber (111) to apply elastic force to the second end head (212) in a direction away from the regulating chamber (112).

2. A pressure reducing device according to claim 1, characterized in that: The pressure-bearing end surfaces of the first end head and the second end head (212) and the pressure regulating elastic member (22) are configured such that when the gas pressure in the regulating chamber (112) exceeds a preset value, the gas pressure in the balancing chamber (111) pushes the second end head (212) to drive the first end head (211) to move so as to reduce the airflow cross section of the pressure reducing channel.

3. A decompression device according to claim 1, characterized in that: The first end head (211) is in the shape of a frustum, and a frustum groove (135) is provided on a side of the chamber of the regulating cavity (112) opposite to the first end head (211), and a gap between the first end head (211) and the frustum groove (135) is a pressure relief channel.

4. A decompression device according to claim 3, characterized in that: When the pressure regulating elastic member (22) is in its fully compressed state, there is a minimum gap between the first end head (211) and the frustum groove (135).

5. A decompression device according to claim 1, characterized in that: The second end head (212) is a disc-shaped structure, one end face of which is connected to the core body (21), and the other end face is a pressure-bearing end face, and the outer annular surface of the disc-shaped structure is sealingly and slidably connected to the inner wall surface of the balancing chamber (111).

6. A decompression device according to claim 5, characterized in that: The pressure regulating elastic member (22) is sleeved on the core body (21) and has two ends abutting against the inner wall surfaces opposite to the disc-shaped structure and the balancing chamber (111).

7. A decompression device according to claim 5, characterized in that: The pressure regulating chambers and the pressure regulating components (2) are in multiple groups and are evenly arranged in the circumferential direction along a plane perpendicular to the gas transmission direction.

8. A pressure reducing device according to claim 7, characterized in that: The valve body is also provided with a diverter channel (136) and a collecting channel (137); the gas inlet channel (1311) is connected to the plurality of regulating chambers (112) via the diverter channel (136); and the gas outlet channel (1341) is connected to the plurality of regulating chambers (112) via the collecting channel (137).

9. A multi-stage self-operated pressure reducing device, characterized in that: It comprises a plurality of pressure reducing devices according to any one of claims 1 to 6, wherein the plurality of pressure reducing devices are arranged in sequence along the air flow direction, and the diversion channels (136) and the converging channels (137) of two adjacent pressure reducing devices are connected via a connecting channel (138).

10. A multi-stage self-operated pressure reducing device according to claim 9, characterized in that: The elastic force of the pressure regulating elastic members (22) of the plurality of pressure reducing devices along the gas transmission direction is gradually reduced.

11. A multi-stage self-operated pressure reducing device according to claim 9, characterized in that: The valve body (1) of the pressure reducing device comprises an outer valve cylinder (12) and an inner valve cylinder (13); the outer valve cylinder (12) is a columnar structure having an assembly cavity (121) in its axial direction; the inner valve cylinder (13) is a multi-section detachable and fastened assembly in the assembly cavity (121); a plurality of pressure regulating cavities are correspondingly provided in the outer valve cylinder (12) and the inner valve cylinder (13); and a plurality of groups of pressure regulating assemblies (2) correspond one to one to the pressure regulating cavities.

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