Two-stage system pressure reducing valve for high-pressure gas

Abstract

The invention relates to a two-stage system pressure reducing valve for high-pressure gas, which comprises a first pressure reducing system and a second pressure reducing system, the first pressure reducing system is accommodated in a first cavity at one end of a valve body, and the second pressure reducing system is accommodated in a second cavity at the other end of the valve body; the first cavity is communicated with the second cavity through a middle internal channel; a threaded section, a pressing ring guide hole, a middle passage and a second-stage small sealing ring guide hole are sequentially formed in the middle internal channel in the direction far away from the first cavity; the radial size of the middle passage is smaller than the radial size of the pressing ring guide hole and the radial size of the second-stage small sealing ring guide hole. By means of the unique structural design, the number of the sealing rings is reduced to the maximum extent, only four sealing rings needed by sealing of the valve element of the two-stage pressure reducing system are reserved in the main body structure, no other auxiliary sealing design is needed, leakage points are reduced to the maximum extent, and the service life of the pressure reducing valve is prolonged.

Description

[Technical field]

[0001] The invention relates to the technical field of pressure reducing valves, in particular to a two-stage system pressure reducing valve for high-pressure gas. [Background technology]

[0002] In the gas pipeline system, due to the high pressure and large fluctuation of the gas source at the supply end, it is difficult to directly meet the needs of the user end. For example, in hydrogen energy vehicles, the pressure of the high-pressure hydrogen storage cylinder at the hydrogen supply end can be as high as 70MPa, while the input pressure of the fuel cell system at the user end is generally required not to exceed 2MPa, and the high-pressure gas pressure at the supply end will gradually decrease with the gas consumption at the user end. When the pressure at the supply end is significantly reduced, it is necessary to go to the hydrogen filling station to refuel to high pressure, so the pressure at the supply end is dynamically changing, and the difference between high and low pressure is large; the fuel cell engine at the user end hopes to obtain relatively low-pressure and stable gas. Therefore, a valve is needed between the gas source end and the fuel cell end of the high-pressure hydrogen storage system to convert the gas with high pressure and large fluctuations at the gas source end into relatively low-pressure and stable gas. It should be pointed out that in addition to hydrogen energy vehicles, there are similar needs in other fields.

[0003] Pressure reducing valves are mainly used to adjust high-pressure gas at the supply end with large pressure fluctuations to low-pressure gas with stable pressure required by the application end, playing the role of reducing and stabilizing pressure.

[0004] In addition to achieving the stable pressure relief function of high-pressure gas, the structural miniaturization, performance stability and air tightness of the pressure relief valve are also receiving more and more attention. Existing pressure relief valves often have complex internal structures and many parts, which makes assembly time-consuming and increases production costs. At the same time, due to the complexity of the structure, more sealing rings are often inevitably required for auxiliary sealing (generally 1 to 3 are required). Excessive use of sealing rings can easily lead to an increase in the risk of leakage. In addition, the sealing rings are not easy to disassemble and replace, which makes early assembly and later maintenance inconvenient.

[0005] Therefore, a pressure reducing valve is needed to optimize and improve the above problems. [Summary of the invention]

[0006] The object of the present invention is to overcome the deficiencies of the prior art and provide a two-stage system pressure reducing valve for high-pressure gas.

[0007] The design principle of the present application: a two-stage system pressure reducing valve for high-pressure gas, the pressure reducing valve includes an air inlet port, a valve body, a two-stage pressure reducing system, an air outlet port, etc.; the two-stage system includes a first pressure reducing system and a second pressure reducing system, and are respectively arranged in cavities at both ends of the valve body, and the cavities at both ends of the valve body are connected through an internal channel in the middle of the valve body; the air inlet port is arranged at one end of the valve body where the first pressure reducing system is located, and is connected to the valve body through its flange structure; the air outlet port is arranged at one end of the valve body where the second pressure reducing system is located, and is connected to the valve body through its flange structure; the external high-pressure gas enters the first pressure reducing system through the air inlet port to achieve initial pressure reduction, and the high-pressure gas after pressure reduction becomes the initial pressure reducing gas; then the initial pressure reducing gas enters the second pressure reducing system through the middle internal channel of the valve body, and is further reduced in pressure in the second pressure reducing system to become the target pressure gas, and is finally output to the subsequent system of the pressure reducing valve through the air outlet port to meet the requirements of the subsequent system for gas pressure and flow.

[0008] The objective of the present invention is achieved through the following technical solutions:

[0009] A two-stage system pressure reducing valve for high-pressure gas, comprising a first pressure reducing system and a second pressure reducing system, wherein the first pressure reducing system is contained in a first cavity at one end of a valve body, and the second pressure reducing system is contained in a second cavity at the other end of the valve body; the first cavity is connected to the second cavity through an intermediate internal passage; characterized in that:

[0010] The middle internal passage is provided with a threaded section, a pressure ring guide hole, a middle passage and a secondary small sealing ring guide hole in sequence in a direction away from the first cavity;

[0011] The radial dimensions of the middle passage are smaller than the radial dimensions of the guide hole of the pressure ring and the guide hole of the secondary small sealing ring.

[0012] The secondary pressure relief pad base of the second pressure relief system is embedded in the threaded section of the middle internal channel through threads;

[0013] The guide portion of the secondary pressure relief pad pressure ring of the second pressure relief system is matched with the pressure ring guide hole with a small gap and is pressed tightly against the bottom of the pressure ring guide hole;

[0014] The secondary small sealing ring of the second decompression system is arranged in the secondary small sealing ring guide hole, and one end of the secondary small sealing ring is closely attached to the bottom of the guide hole.

[0015] The air inlet port is arranged at one end of the valve body where the first cavity is located, and the air outlet port is arranged at the other end of the valve body where the second cavity is located.

[0016] The air inlet port is connected to one end of the valve body where the first pressure reducing system is located through its flange, and cooperates with the guide cylindrical surface of the first cavity with a small gap through its guide column, so that the central axis of the air inlet port is coaxial with the central axis of the first cavity; a groove is provided on the flange to reduce the weight of the air inlet port; a throttling channel is provided at the air inlet end of the air inlet port, and the throttling channel is used to reduce the impact force of the high-pressure gas on the first pressure reducing system; a protrusion is provided at the end of the throttling channel, and the protrusion cooperates with the first pressure reducing system for the initial pressure reducing of the high-pressure gas; a long ring is provided inside the guide column, and a short ring is provided at the bottom of the long ring, the outer diameter of the short ring is larger than the outer diameter of the long ring, and the inner diameters of the two are the same; the throttling channel, the protrusion, the long ring and the short ring are all coaxial with the guide column.

[0017] The first decompression system includes a first-level decompression pad, a first-level movable element, a first-level small sealing ring, a first-level small guide ring, a first-level large sealing ring, a first-level large guide ring, and a first-level elastic element; the first-level sealing ring and the first-level small guide ring are arranged in the corresponding card slots of the first-level movable element,

[0018] The first-level sealing ring is closer to the end where the first-level pressure relief pad is located relative to the first-level small guide ring; the first-level sealing ring and the first-level small guide ring are both arranged in the inner cavity of the long circular ring of the air inlet port, and can slide sealingly along the inner wall of the long circular ring with the first-level movable element.

[0019] The primary elastic element is sleeved on the outer periphery of the long circular ring and the short circular ring, and the inner wall of the elastic element and the outer wall of the short circular ring are matched with a small gap so that the axis of the elastic element is basically coaxial with the axis of the long circular ring and the short circular ring; the outer diameter of the short circular ring is larger than the outer diameter of the long circular ring, thereby avoiding contact between the inner wall of the elastic element and the outer wall of the long circular ring.

[0020] The long ring, the short ring, the first-stage pressure reducing pad, the first-stage small sealing ring and the first-stage small guide ring are nested inside the first-stage elastic element, thereby effectively reducing the size of the first-stage pressure reducing system of the pressure reducing valve.

[0021] The second decompression system includes a secondary decompression pad, a secondary decompression pad base, a secondary decompression pad pressure ring, a secondary small sealing ring, a secondary small guide ring, a secondary large guide ring, a secondary large sealing ring, a guide sleeve, a secondary movable element, and a secondary elastic element;

[0022] The secondary pressure relief pad base of the second pressure relief system is embedded in the threaded section of the middle internal channel through a thread. A torque boss with a torque transmission function is provided at one end of the secondary pressure relief pad base, and the torque boss is sunk into the small cavity of the first tail; a countersink is provided at the other end of the secondary pressure relief pad base, and a circumferentially distributed through channel is provided around the countersink; the secondary pressure relief pad is provided with a large diameter portion and a small diameter portion, and the large diameter portion is guided to sink into the countersink of the secondary pressure relief pad base, and the axial dimension of the large diameter portion of the secondary pressure relief pad is slightly larger than the depth of the countersink; the secondary pressure relief pad pressure ring is provided with a guide portion and a clamping portion, and the outer diameter of the clamping portion is smaller than the guide portion. The outer diameter of the guide part and the aperture of the pressure ring guide hole, and the inner diameter of the guide part is larger than the outer diameter of the small diameter part of the secondary pressure relief pad, and a gap is formed between the two; the end face of the clamping part of the secondary pressure relief pad pressure ring is pressed on the large diameter part of the secondary pressure relief pad, so that the secondary pressure relief pad is mechanically fixed between the secondary pressure relief pad base and the secondary pressure relief pad pressure ring, and its guide part cooperates with the small gap of the pressure ring guide hole and is pressed on the bottom of the pressure ring guide hole; the clamping part of the secondary pressure relief pad pressure ring is provided with a radial through cut, and the gap between the secondary pressure relief pad pressure ring and the secondary pressure relief pad small diameter part is connected with the through channel on the secondary pressure relief pad base through the radial through cut.

[0023] The secondary small sealing ring is arranged in the secondary small sealing ring guide hole, and one end of the secondary small sealing ring is pressed against the bottom of the guide hole; the guide cylinder of the guide sleeve is matched with the small clearance of the second cavity, so that the guide sleeve is coaxial with the center of the second cavity, and its positioning end face is pressed against the bottom face of the second cavity, and its outer raised cylinder is matched with the clearance of the secondary small sealing ring guide hole, and its outer raised cylinder end face is pressed against the other end of the secondary small sealing ring or there is a small clearance between the two; a through hole is provided in the center of the guide sleeve, and a coaxial annular groove is provided on the through hole, and the secondary small guide ring is installed in the annular groove; the guide sleeve is away from the outer An inner raised cylinder is provided in the direction of the side raised cylinder, and the outer circle of the inner raised cylinder cooperates with the small clearance inside the secondary elastic element, so that the secondary elastic element and the guide sleeve are basically coaxial, and the outer side of the secondary elastic element is prevented from contacting the inner wall of the guide sleeve; a guide angle is provided on the side of the guide sleeve through hole close to the inner raised cylinder, and the guide angle is used to guide the installation of the secondary small guide ring; the positioning ring of the air outlet port cooperates with the small clearance of the second cavity, and the flange end face of the air outlet port does not contact the end face of one end of the valve body where the second cavity is located, so as to ensure that the end face of its positioning ring can be pressed against the large end face of the guide sleeve.

[0024] The air outlet port and the guide sleeve form a third cavity, and the secondary elastic element and the secondary movable element are accommodated in the third cavity; the secondary elastic element is located between the guide sleeve and the secondary movable element, and its inner side is matched with a small gap between the outer circle of the raised cylinder on the inner side of the guide sleeve; the rod of the secondary movable element passes through the secondary small sealing ring, the guide sleeve, the secondary small guide ring, the secondary elastic element and other components in sequence, and the end face of the rod is opposite to the secondary pressure relief pad; the guide part of the secondary movable element is provided with two slots, the secondary large guide ring, and the secondary large sealing ring are arranged in the two slots, and the secondary large sealing ring is farther away from the rod.

[0025] Compared with the prior art, the present invention has the following positive effects:

[0026] The present application reduces the number of sealing rings to the greatest extent through a unique intermediate internal channel structure design. The main structure only retains the four sealing rings required for the valve core sealing of the two-stage pressure reducing system, without any other auxiliary sealing design. Therefore, the leakage points are minimized to the greatest extent and the service life of the pressure reducing valve is extended.

[0027] The present application provides a pressure reducing valve with a compact and simple structure, a small number of components, easy assembly, high pressure resistance, and stable output pressure.

Brief Description of the Drawings

[0028] Figure 1 It is a schematic diagram of the overall structure of a two-stage system pressure reducing valve for high-pressure gas of the present application;

[0029] Figure 2 It is a structural schematic diagram of the air inlet port of a pressure reducing valve component of the present application;

[0030] Figure 3 It is a structural schematic diagram of the secondary pressure relief pad base of the pressure relief valve component of the present application;

[0031] Figure 4 It is a structural schematic diagram of a guide sleeve of a pressure reducing valve component of the present application; [Specific implementation method]

[0033] The following provides a specific implementation of a two-stage system pressure reducing valve for high-pressure gas of the present invention.

[0034] Example 1

[0035] Please refer to the attached drawings, a two-stage system pressure reducing valve for high-pressure gas includes an air inlet port 1, a valve body 2, an air outlet port 3, a first pressure reducing system 5, a second pressure reducing system 6, etc.; wherein the first pressure reducing system 5 is accommodated in a first cavity 7 at one end of the valve body 2, and the second pressure reducing system 6 is accommodated in a second cavity 8 at the other end of the valve body 2, and the air inlet port 1, the valve body 2, the air outlet port 3 and the two-stage pressure reducing system are on the same axis; the first cavity 7 is connected to the second cavity 8 through an intermediate internal channel 4; the air inlet port 1 is arranged at one end of the valve body 2 where the first cavity 7 is located, and the air outlet port is arranged at one end of the valve body 2 where the second cavity 8 is located;

[0036] The air inlet port 1 is connected to one end of the valve body where the first pressure reducing system is located through its flange 1.1, and cooperates with the guide cylindrical surface 7.1 of the first cavity 7 through its guide column 1.2 with a small gap, so that the central axis of the air inlet port 1 is coaxial with the central axis of the first cavity 7; a groove 1.6 is provided on the flange 1.1, which is used to reduce the weight of the air inlet port 1; a throttling channel 1.4 is provided at the air inlet end of the air inlet port 1, and the throttling channel is used to reduce the impact force of the high-pressure gas on the first pressure reducing system; a protrusion 1.5 is provided at the end of the throttling channel (1.4, and the protrusion cooperates with the first pressure reducing system 5 to reduce the initial pressure of the high-pressure gas; a long circular ring 1.7 is provided inside the guide column 1.2, and a short circular ring 1.8 is provided at the bottom of the long circular ring 1.7, and the outer diameter of the short circular ring 1.8 is larger than the outer diameter of the long circular ring 1.7, and the inner diameters of the two are the same; the throttling channel 1.4, the protrusion 1.5, the long circular ring 1.7, and the short circular ring 1.8 are all coaxial with the guide column 1.2;

[0037] The first decompression system comprises a first-level decompression pad 9, a first-level movable element 10, a first-level small sealing ring 11, a first-level small guide ring 12, a first-level large sealing ring 15, a first-level large guide ring 14, and a first-level elastic element 13; a circular hole 10.1 is provided at one end of the first-level movable element 10 close to the inlet port protrusion 1.5, and the first-level decompression pad 9 is embedded in the circular hole 10.1 and is opposite to the inlet port protrusion 1.5; the first-level small sealing ring 11, the first-level small guide ring 12, the first-level large sealing ring 15, and the first-level large guide ring 14 are respectively provided It is placed in the corresponding annular groove of the first-level movable element; the first-level small sealing ring 11 and the first-level small guide ring 12 are both arranged in the inner cavity of the long circular ring 1.7 of the air inlet port, and can slide sealingly along the inner wall of the long circular ring 1.7, wherein the first-level small sealing ring 11 is closer to the end where the first-level pressure relief pad is located relative to the first-level small guide ring 12, and together with the protrusion 1.5, a part of the inner cavity of the long circular ring is closed to form a first pressure relief space 1.3; the external gas enters the first pressure relief space after passing through the narrow space between the protrusion 1.5 of the air inlet port and the first-level pressure relief pad 9.

[0038] The primary elastic element 13 is sleeved on the periphery of the long circular ring 1.7 and the short circular ring 1.8, and the inner wall of the elastic element 13 and the outer wall of the short circular ring 1.8 are matched with a small gap, so that the axis of the elastic element 13 is basically coaxial with the axis of the long circular ring 1.7 and the short circular ring 1.8; the outer diameter of the short circular ring 1.8 is larger than the outer diameter of the long circular ring, so as to avoid the inner wall of the elastic element 13 from contacting the outer wall of the long circular ring 1.7. The long circular ring 1.7, the short circular ring 1.8, the primary pressure relief pad 9, the primary small sealing ring 11, and the primary small guide ring 12 are nested inside the primary elastic element 13, making the primary pressure relief system structure compact, thereby effectively reducing the overall size and weight of the pressure relief valve;

[0039] A first-level large sealing ring 15 and a first-level large guiding ring 14 are arranged at one end of the first-level movable element 10 away from the first-level decompression pad 9, and the first-level large sealing ring 15 is further away from the first-level decompression pad 9; the first-level large sealing ring 15 seals the end of the first cavity 7 away from the air inlet port into a second decompression space 10.4, and can slide sealingly along the inner wall of the first cavity 7 where the second decompression space 10.4 is located; a first-level tail small cavity 10.5 and a radial channel 10.6 are arranged at the end of the first-level movable element away from the air inlet port, and the gas can enter the second decompression space 10.4 from the first decompression space 1.3 through a plurality of small horizontal holes 10.2, a large vertical hole 10.3, a first-level tail small cavity 10.5 and a radial channel 10.6 on the first-level movable element 13 in sequence;

[0040] The middle internal channel 4 of the valve body 2 is provided with a threaded section 4.1, a pressing ring guide hole 4.2, a middle passage 4.3, a secondary small sealing ring guide hole 4.4, etc. in sequence in the direction away from the first cavity 7, and the radial dimensions of the middle passage 4.3 are smaller than the radial dimensions of the pressing ring guide hole 4.2 and the secondary small sealing ring guide hole 4.4;

[0041] The second decompression system includes a secondary decompression pad 17, a secondary decompression pad base 16, a secondary decompression pad pressure ring 18, a secondary small sealing ring 19, a secondary small guide ring 20, a secondary large guide ring 25, a secondary large sealing ring 26, a guide sleeve 21, a secondary movable element 24, a secondary elastic element 22, etc., wherein the secondary small sealing ring 19 and the secondary large sealing ring 26 are lip seals;

[0042] The secondary pressure relief pad base 16 is embedded in the threaded section 4.1 of the middle internal channel 4 through a thread. A torque boss 16.1 with a torque transmission function is provided at one end of the secondary pressure relief pad base 16. The torque boss is a regular polygon and is embedded in the first-stage tail small cavity 10.5. A countersunk hole 16.3 is provided at the other end of the secondary pressure relief pad base 16. A circumferentially distributed through channel 16.2 is provided around the countersunk hole 16.3. The secondary pressure relief pad 17 is provided with a large diameter portion and a small diameter portion. The large diameter portion is sunk into the countersunk hole 16.3 of the secondary pressure relief pad base and cooperates with the small gap therewith. The axial dimension of the large diameter portion of the secondary pressure relief pad 17 is larger than the depth of the countersunk hole 16.3. The secondary pressure relief pad pressure ring 18 is provided with a guiding part and a pressing part. The outer diameter of the pressing part is smaller than the outer diameter of the guiding part and the aperture of the pressure ring guide hole 4.2, and its inner diameter is larger than the outer diameter of the small diameter part of the secondary pressure relief pad 17, and a gap 18.1 is formed between the two. The end face of the pressing part of the secondary pressure relief pad pressure ring 18 is pressed on the large diameter part of the secondary pressure relief pad 17, so that the secondary pressure relief pad 17 is mechanically fixed, and the guiding part cooperates with the small gap of the pressure ring guide hole 4.2 and is pressed on the bottom of the pressure ring guide hole 4.2. The pressing part of the secondary pressure relief pad pressure ring 18 is provided with a radial through cut, and the gap 18.1 is connected with the second pressure relief space 10.4 through the through cut and the through channel 16.2 on the secondary pressure relief pad base 16.

[0043] The secondary small sealing ring 19 is arranged in the secondary small sealing ring guide hole 4.4, and its lip end is closely attached to the bottom of the guide hole 4.4; the guide cylinder 21.1 of the guide sleeve 21 is matched with the second cavity 8 with a small gap, so that the guide sleeve 21 is coaxial with the center of the second cavity 8, and its positioning end face 21.2 is closely attached to the bottom surface of the second cavity 8, and its outer raised cylinder 21.4 is matched with the secondary small sealing ring guide hole 4.4 with a large gap, and the end face 21.3 of the outer raised cylinder 21.4 is closely attached to the non-lip end of the secondary small sealing ring 19 or separated by a small gap; the guide sleeve 21 A through hole 21.5 is provided at the center of the guide sleeve 21, and a coaxial annular groove 21.6 is provided on the through hole. The secondary small guide ring 20 is installed in the annular groove 21.6; the guide sleeve 21 is provided with an inner protruding cylinder 21.7 in the direction away from the outer protruding cylinder 21.4, and the outer circle of the inner protruding cylinder 21.7 is matched with a small gap inside the secondary elastic element 22, so that the secondary elastic element 22 is basically coaxial with the guide sleeve 21, and the outer side of the secondary elastic element 22 is prevented from contacting the inner wall of the guide sleeve; the through hole 21.5 of the guide sleeve 21 is close to the inner protruding cylinder 21. A guide angle 21.8 is provided on one side of the gas outlet port 3, and the guide angle is used to guide the installation of the secondary small guide ring 20; the positioning ring 3.1 of the gas outlet port 3 is matched with the second cavity 8 with a small gap, and its flange end face 3.3 does not contact the end face of the valve body where the second cavity 8 is located, so as to ensure that the end face of the positioning ring 3.1 can be pressed against the large end face 21.9 of the guide sleeve; the inner diameter of the gas outlet port positioning ring 3.1 is the same as the diameter of the inner wall 21.10 of the guide sleeve, and its inner cavity and the inner cavity of the guide sleeve form a third cavity 23, and the secondary elastic element 22 and the secondary movable element 24 contain The secondary movable element 24 is received in the third cavity 23; the secondary elastic element 22 is located between the guide sleeve 21 and the secondary movable element 24, and its inner side is matched with the outer circle of the inner raised cylinder 21.8 with a small gap; the rod of the secondary movable element 24 passes through the secondary small sealing ring 19, the guide sleeve 21, the secondary small guide ring 20, the secondary elastic element 22 and other components in sequence, and the end face of the rod is opposite to the secondary pressure relief pad 17, and the guide part of the secondary movable element 24 is provided with two grooves, the secondary large guide ring 25, and the secondary large sealing ring 26 are arranged in the two grooves, and the secondary large sealing ring 26 is farther away from the rod.

[0044] The secondary pressure relief pad 17, the middle passage 4.3 of the valve body, the secondary small sealing ring 19 and the rod end face of the secondary active element 24 form an area, which is called the third pressure relief space 4.5. The third pressure relief space 4.5 is connected to the gap 18.1. The secondary large sealing ring 26 and the end of the third cavity 23 close to the gas outlet port form the fourth pressure relief space 24.4. The third pressure relief space 4.5 is connected to the fourth pressure relief space 24.4 through the rod channel 24.1 of the secondary active element 24, the small cavity 24.2 of the guide part and the transverse cutout 24.3 of the end face of the guide part. The small cavity 24.2 of the guide part is connected to the pressure relief valve outlet 3.2. The gas in the second pressure relief space 10.4 can be connected to the third pressure relief space 4.5, the fourth pressure relief space 24.4 and the pressure relief valve outlet 3.2 through the above-mentioned connected channels. When the pressure reducing valve is working, due to the interaction between the two-stage pressure reducing system and the gas, corresponding throttling areas are formed in the area between the first-stage pressure reducing pad 9 and the inlet port protrusion 1.5, and in the area between the second-stage pressure reducing pad 17 and the rod end face of the second-stage active element 24. The high-pressure gas entering the pressure reducing valve passes through the throttling area between the first-stage pressure reducing pad 9 and the inlet port protrusion 1.5, becomes the primary pressure reducing gas, and enters the first pressure reducing space 1.3, the second pressure reducing space 10.4 successively, and then passes through the throttling area between the second-stage pressure reducing pad 17 and the rod end face of the second-stage active element 24, enters the third pressure reducing space 4.5, the fourth pressure reducing space 24.4 successively, and enters the subsequent system of the pressure reducing valve through the outlet 3.2. The pressure reducing valve ensures that the output pressure remains stable when the inlet pressure changes greatly through a two-stage pressure reducing structure. At the same time, the valve size is fully compressed in the structural design to achieve miniaturization of the valve. The main structure only retains the four sealing rings required for the valve core sealing of the two-stage pressure reducing system, without any other auxiliary sealing design. Therefore, the leakage points are minimized to the greatest extent and the service life of the pressure reducing valve is extended. This is also the reason why the structural design of the present application is different from the prior art and achieves better technical effects.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the concept of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A two-stage pressure reducing valve for high-pressure gas, comprising a first pressure reducing system (5) and a second pressure reducing system (6), wherein the first pressure reducing system (5) is accommodated in a first cavity (7) at one end of a valve body (2), and the second pressure reducing system is accommodated in a second cavity (8) at the other end of the valve body (2); the first cavity (7) and the second cavity (8) are connected through an intermediate internal passage (4); characterized in that: The middle internal channel (4) is provided with a threaded section (4.1), a pressure ring guide hole (4.2), a middle passage (4.3) and a secondary small sealing ring guide hole (4.4) in sequence in a direction away from the first cavity (7); The radial dimensions of the middle passage (4.3) are smaller than the radial dimensions of the pressing ring guide hole (4.2) and the secondary small sealing ring guide hole (4.4).

2. A two-stage system pressure reducing valve for high pressure gas according to claim 1, characterized in that: The secondary pressure relief pad base (16) of the second pressure relief system (6) is embedded in the threaded section (4.1) of the middle internal channel (4) through threads; The guide portion of the secondary pressure reducing pad pressure ring (18) of the second pressure reducing system (6) is matched with the pressure ring guide hole (4.2) with a small gap and is pressed tightly against the bottom of the pressure ring guide hole (4.2); The secondary small sealing ring (19) of the second decompression system (6) is arranged in the secondary small sealing ring guide hole (4.4), and one end thereof is closely attached to the bottom of the guide hole (4.4).

3. A two-stage system pressure reducing valve for high pressure gas according to claim 1, characterized in that: The air inlet port (1) is arranged at one end of the valve body (2) where the first cavity (7) is located, and the air outlet port is arranged at the other end of the valve body (2) where the second cavity (8) is located.

4. A two-stage system pressure reducing valve for high-pressure gas according to claim 1 or 3, characterized in that: The air inlet port (1) is connected to one end of the valve body where the first pressure reducing system (5) is located through its flange (1.1), and is matched with a guide cylindrical surface (7.1) of the first cavity (7) through its guide column (1.2) with a small clearance, so that the central axis of the air inlet port (1) is coaxial with the central axis of the first cavity (7); a groove (1.6) is provided on the flange (1.1) to reduce the weight of the air inlet port (1); a throttling channel (1.4) is provided at the air inlet end of the air inlet port (1), and the throttling channel is used to reduce the impact of high-pressure gas on the first pressure reducing system impact force; a protrusion (1.5) is provided at the end of the throttling channel (1.4), and the protrusion cooperates with the first decompression system (5) to reduce the initial pressure of the high-pressure gas; a long circular ring (1.7) is provided inside the guide column (1.2), and a short circular ring (1.8) is provided at the bottom of the long circular ring (1.7); the outer diameter of the short circular ring (1.8) is larger than the outer diameter of the long circular ring (1.7), and the inner diameters of the two are the same; the throttling channel (1.4), the protrusion (1.5), the long circular ring (1.7), and the short circular ring (1.8) are all coaxial with the guide column (1.2).

5. A two-stage system pressure reducing valve for high pressure gas according to claim 1, characterized in that: The first decompression system comprises a first-level decompression pad (9), a first-level movable element (10), a first-level small sealing ring (11), a first-level small guide ring (12), a first-level large sealing ring (15), a first-level large guide ring (14), and a first-level elastic element (13); the first-level sealing ring (11) and the first-level small guide ring (12) are arranged in corresponding slots of the first-level movable element (10). The first-stage sealing ring (11) is closer to the end where the first-stage pressure relief pad is located relative to the first-stage small guide ring (12); the first-stage sealing ring (11) and the first-stage small guide ring (12) are both arranged in the inner cavity of the long circular ring (1.7) of the air inlet port, and can slide sealingly along the inner wall of the long circular ring (1.7) along with the first-stage movable element (10).

6. A two-stage system pressure reducing valve for high pressure gas as claimed in claim 5, characterized in that: The primary elastic element (13) is sleeved on the periphery of the long circular ring (1.7) and the short circular ring (1.8), and the inner wall of the elastic element (13) and the outer wall of the short circular ring (1.8) are matched with a small gap, so that the axis of the elastic element (13) and the axes of the long circular ring (1.7) and the short circular ring (1.8) are basically coaxial; the outer diameter of the short circular ring (1.8) is larger than the outer diameter of the long circular ring, so as to avoid the inner wall of the elastic element (13) and the outer wall of the long circular ring (1.7) from contacting.

7. A two-stage system pressure reducing valve for high pressure gas as claimed in claim 5, characterized in that: The long circular ring (1.7), the short circular ring (1.8), the first-stage pressure reducing pad (9), the first-stage small sealing ring (11), and the first-stage small guide ring (12) are nested inside the first-stage elastic element (13), thereby effectively reducing the size of the first-stage pressure reducing system of the pressure reducing valve.

8. A two-stage system pressure reducing valve for high pressure gas according to claim 1, characterized in that: The second decompression system comprises a secondary decompression pad (17), a secondary decompression pad base (16), a secondary decompression pad pressure ring (18), a secondary small sealing ring (19), a secondary small guide ring (20), a secondary large guide ring (25), a secondary large sealing ring (26), a guide sleeve (21), a secondary movable element (24), and a secondary elastic element (22); The secondary pressure relief pad base (16) of the second pressure relief system is embedded in the threaded section (4.1) of the middle internal channel (4) through a thread, and a torque boss (16.1) having a torque transmission function is provided at one end of the secondary pressure relief pad base (16), and the torque boss (16.1) is sunk into the primary tail small cavity (10.5); a countersunk hole (16.3) is provided at the other end of the secondary pressure relief pad base (16), and a circumferentially distributed through channel (16.2) is provided around the countersunk hole (16.3); The secondary pressure relief pad (17) is provided with a large diameter portion and a small diameter portion, the large diameter portion is guided to sink into the countersunk hole (16.3) of the secondary pressure relief pad base, and the axial dimension of the large diameter portion of the secondary pressure relief pad (17) is slightly larger than the depth of the countersunk hole (16.3); The secondary pressure relief pad pressure ring (18) is provided with a guide part and a pressing part, the outer diameter of the pressing part is smaller than the outer diameter of the guide part and the hole diameter of the pressure ring guide hole (4.2), and the inner diameter thereof is larger than the outer diameter of the small diameter part of the secondary pressure relief pad (17), and a gap (18.1) is formed between the two. The end surface of the pressing part of the secondary pressure relief pad pressing ring (18) is pressed on the large diameter part of the secondary pressure relief pad (17), so that the secondary pressure relief pad (17) is mechanically fixed between the secondary pressure relief pad base (16) and the secondary pressure relief pad pressing ring (18), and the guide part thereof is matched with the guide hole (4.2) of the pressing ring with a small gap and is pressed on the bottom of the guide hole (4.2); The pressing portion of the secondary pressure reducing pad pressing ring (18) is provided with a radial through cutout which is in communication with the through channel (16.2) and the gap (18.1).

9. A two-stage system pressure reducing valve for high pressure gas according to claim 1, characterized in that: The secondary small sealing ring (19) is arranged in the secondary small sealing ring guide hole (4.4), and one end of the secondary small sealing ring is closely attached to the bottom of the guide hole (4.4); the guide cylinder (21.1) of the guide sleeve (21) is matched with the second cavity (8) with a small gap, so that the guide sleeve (21) and the center of the second cavity (8) are coaxial, the positioning end surface (21.2) of the guide sleeve is closely attached to the bottom surface of the second cavity (8), the outer protruding cylinder (21.4) of the guide sleeve is matched with the secondary small sealing ring guide hole (4.4) with a gap, and the end surface (21.3) of the outer protruding cylinder (21.4) of the guide sleeve is closely attached to the other end of the secondary small sealing ring (19) or there is a small gap between the two; A through hole (21.5) is provided at the center of the guide sleeve (21), a coaxial annular groove (21.6) is provided on the through hole, and the secondary small guide ring (20) is installed in the annular groove (21.6); The guide sleeve (21) is provided with an inner protruding cylinder (21.7) in a direction away from the outer protruding cylinder (21.4), and the outer circle of the inner protruding cylinder (21.7) is matched with a small gap inside the secondary elastic element (22), so that the secondary elastic element (22) and the guide sleeve (21) are basically coaxial, and the outer side of the secondary elastic element (22) is prevented from contacting the inner wall (21.10) of the guide sleeve; A guide angle (21.8) is provided on one side of the through hole (21.5) of the guide sleeve (21) close to the inner raised cylinder (21.7), and the guide angle is used to guide the installation of the secondary small guide ring (20); the positioning ring (3.1) of the air outlet port (3) is matched with the second cavity (8) with a small gap, and the flange end face (3.3) of the air outlet port (3) does not contact the end face of one end of the valve body where the second cavity (8) is located, so as to ensure that the end face of the positioning ring (3.1) can be pressed against the large end face (21.9) of the guide sleeve.

10. A two-stage system pressure reducing valve for high pressure gas according to claim 9, characterized in that: The air outlet port (3) and the guide sleeve (21) form a third cavity (23), and the secondary elastic element (22) and the secondary movable element (24) are accommodated in the third cavity (23); the secondary elastic element (22) is located between the guide sleeve (21) and the secondary movable element (24), and its inner side is matched with the outer circle of the raised cylinder (21.8) on the inner side of the guide sleeve with a small clearance; the rod of the secondary movable element (24) passes through the secondary small sealing ring (19), the guide sleeve (21), the secondary small guide ring (20), the secondary elastic element (22) and other components in sequence, and the end face of the rod is opposite to the secondary pressure relief pad (17); the guide part of the secondary movable element (24) is provided with two slots, the secondary large guide ring (25), and the secondary large sealing ring (26) are arranged in the two slots, and the secondary large sealing ring (26) is farther away from the rod.

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