Ultrahigh-pressure axial-flow type gas pressure regulator

Abstract

The ultrahigh-pressure axial-flow type gas pressure regulator comprises a left valve body, a middle valve body, a right valve body and a pressure regulating assembly, the left valve body is provided with a gas inlet channel, a valve clack and a guide sleeve are fixed to the right end of the left valve body in a sealed mode, the valve clack is provided with a vent hole, a pressure regulating gas channel is formed between the guide sleeve and the valve clack, and the middle valve body is connected with the left valve body and the right valve body in a sealed mode in a left-right corresponding mode. The pressure adjusting assembly comprises a piston and a valve cylinder, the piston is in sliding sealing fit with the middle valve body, the valve cylinder is fixed to the middle of the piston in a sealing mode, the left half portion of the valve cylinder is in sliding sealing fit with the guide sleeve, the right half portion of the valve cylinder is in sliding sealing fit with the right valve body, and the space between the piston and the left valve body is an inflation cavity. A space between the piston and the right valve body is a feedback cavity which is communicated with the air outlet channel; the left valve body, the middle valve body, the right valve body, the valve clack, the guide sleeve, the piston and the valve cylinder are all made of austenitic stainless steel. The device has the advantages of simple structure, safety, reliability and high practicability.

Description

Technical Field

[0001] The invention relates to a fuel gas pressure regulator, in particular to an ultra-high pressure axial flow fuel gas pressure regulator which can be used for compressing hydrogen. Background Art

[0002] With the development of clean energy, hydrogen energy has been vigorously promoted and applied. At present, pipeline hydrogen is not yet popular. Most of the compressed hydrogen is transported to users by compression and tank trucks. Normally, hydrogen is compressed to about 25MPa, which is an ultra-high pressure for the gas industry. For users, whether hydrogen is mixed with natural gas or used alone, most of them work in the medium and low pressure range (less than 0.4MPa). This requires the use of a pressure regulator to convert ultra-high pressure hydrogen into medium and low pressure hydrogen. The commonly used gas pressure regulators in this field are mainly radial pressure regulators, such as Figure 1 and Figure 2 The Italian Tatarini RP / 10 pressure regulator shown mainly includes a valve body consisting of a lower valve body 1', an upper shell 2', an inlet end pipe joint 3' and an outlet end pipe joint 4', and a regulating assembly consisting of a diaphragm 5', an upper tray 6', a lower tray 7', a valve stem 8' and a valve flap 9', wherein the lower valve body 1' is provided with a guide sleeve 10' cooperating with the valve stem 8', a valve seat 11' cooperating with the valve flap 9', an outlet pressure feedback channel 12' and an air charging channel, and an air charging needle valve 13' and an exhaust needle valve 14' for controlling the on-off of the air charging channel. In actual applications, the radial flow pressure regulator of this structure has the problems of complex structure, high processing difficulty, large internal resistance and high fluid noise, especially the use of a diaphragm 5' as a pressure regulating movable part, which cannot meet the durability requirements of ultra-high pressure pressure regulation due to structural strength limitations, and the existing pressure regulator is prone to hydrogen embrittlement and cannot be used for hydrogen pressure regulation. Summary of the invention

[0003] The purpose of the present invention is to provide an ultra-high pressure axial flow fuel gas pressure regulator, which has the advantages of simple structure, easy processing, safety and reliability, and strong practicality, and can meet the use requirements for regulating the pressure of ultra-high pressure hydrogen.

[0004] In order to solve the problems existing in the prior art, the present invention provides an ultra-high pressure axial flow gas pressure regulator, comprising a left valve body, a middle valve body, a right valve body and a pressure regulating assembly, wherein the left valve body is provided with an air inlet passage along the axis, an annular connecting portion is provided at the middle portion of the outer side of the left valve body, a valve disc and a guide sleeve are sealed and fixed at the right end of the left valve body, the valve disc is provided with air vents distributed along the circumferential direction, a pressure regulating air passage is formed between the guide sleeve and the valve disc, the middle valve body is cylindrical, the left end of the middle valve body is coaxially sealed and fixedly connected with the connecting portion of the left valve body, the right valve body is provided with an air outlet passage along the axis, the left end of the right valve body is coaxially sealed and fixedly connected with the right end of the middle valve body The pressure regulating assembly comprises a piston and a valve cylinder, the piston is located between the guide sleeve and the right valve body and is in sliding and sealing cooperation with the middle valve body, the valve cylinder is sealed and fixed in the middle of the piston, the left half of the valve cylinder is located in the guide sleeve and the two are in sliding and sealing cooperation, the right half of the valve cylinder is located in the right valve body and the two are in sliding and sealing cooperation, the space between the piston and the left valve body is an inflation chamber, the space between the piston and the right valve body is a feedback chamber, and the feedback chamber is connected with the air outlet channel through a feedback channel arranged in the right valve body; the left valve body, the middle valve body, the right valve body, the valve disc, the guide sleeve, the piston and the valve cylinder are all made of austenitic stainless steel.

[0005] Furthermore, the present invention provides an ultra-high pressure axial flow gas pressure regulator, wherein a vertical inflation channel connected to an air inlet channel and a transverse inflation channel connected to an inflation chamber are provided at the connection position of the left valve body, an inflation valve for controlling the on-off of the transverse inflation channel and the vertical inflation channel is provided at the connection position of the transverse inflation channel and the vertical inflation channel, and an exhaust channel connecting the inflation chamber and the atmosphere and an exhaust valve for controlling the on-off of the exhaust channel are provided on the middle valve body.

[0006] Furthermore, the present invention provides an ultra-high pressure axial flow gas pressure regulator, wherein the connecting portion is provided with a first stepped hole coaxial with the vertical inflation channel, the inflation valve is installed in the first stepped hole by means of threads, the lower end of the inflation valve is provided with a first sealing gasket extruded around the upper port of the vertical inflation channel, the middle valve body is provided with a second stepped hole coaxial with the exhaust channel, the exhaust valve is installed in the second stepped hole by means of threads, the lower end of the exhaust valve is provided with a second sealing gasket extruded around the upper port of the exhaust channel, and the first sealing gasket and the second sealing gasket are made of rubber.

[0007] Furthermore, the present invention provides an ultra-high pressure axial flow gas pressure regulator, wherein the left end of the right valve body is fixedly connected to the right end of the middle valve body by screws, the right valve body is provided with a positioning ring platform extending into the middle valve body, a first sealing ring extruded on the middle valve body is installed on the outer peripheral wall of the positioning ring platform through a first sealing groove, a second sealing groove is formed between the left end face of the positioning ring platform and the middle valve body, a second sealing ring and a sealing ring are provided in the second sealing groove, the first sealing ring and the second sealing ring are made of rubber, the sealing ring is made of polytetrafluoroethylene and is attached to the piston.

[0008] Furthermore, the present invention provides an ultra-high pressure axial flow gas pressure regulator, wherein the connecting portion of the left valve body is fixedly connected to the left end of the middle valve body by screws, and the left end of the middle valve body is provided with a third sealing ring extruded on the connecting portion and made of rubber through a third sealing groove.

[0009] Furthermore, the present invention provides an ultra-high pressure axial flow gas pressure regulator, wherein the guide sleeve is fixed to the right end of the left valve body by screws, the valve disc is clamped between the left valve body and the guide sleeve, and a first sealing member is clamped between the left valve body, the valve disc and the guide sleeve.

[0010] Furthermore, the present invention provides an ultra-high pressure axial flow gas pressure regulator, wherein a second sealing member cooperating with the valve cylinder is fixed to the right side of the valve disc by screws and a pressure plate.

[0011] Furthermore, the present invention provides an ultra-high pressure axial flow gas pressure regulator, wherein a limit ring is provided on the peripheral wall of the valve cylinder, the limit ring is clamped in a corresponding groove on the left side of the piston, and a pressure ring is provided on the left side of the limit ring and fixed to the piston by screws.

[0012] Furthermore, the present invention provides an ultra-high pressure axial flow gas pressure regulator, wherein a fourth sealing ring extruded on the valve cylinder is installed on the inner wall of the guide sleeve through a fourth sealing groove, and a fifth sealing ring extruded on the valve cylinder is installed on the inner wall of the right valve body through a fifth sealing groove.

[0013] Furthermore, the present invention provides an ultra-high pressure axial flow gas pressure regulator, wherein the left end of the left valve body is provided with an inlet end flange, an inlet end pressure gauge is installed on the inlet end flange, and the inlet port of the inlet end pressure gauge is connected with the inlet channel through the inlet pressure taking channel, and the right end of the right valve body is provided with an outlet end flange, an outlet end pressure gauge is installed on the outlet end flange, and the inlet port of the outlet end pressure gauge is connected with the outlet channel through the outlet pressure taking channel.

[0014] Compared with the prior art, the ultra-high pressure axial flow gas pressure regulator of the present invention has the following advantages: the present invention arranges a left valve body, a middle valve body, a right valve body and a pressure regulating assembly, so that the left valve body is provided with an air inlet passage along the axis, an annular connecting portion is provided in the middle of the outer side of the left valve body, and a valve flap and a guide sleeve are sealed and fixed at the right end of the left valve body, wherein the valve flap is provided with air vents distributed along the circumferential direction, and a pressure regulating air passage is formed between the guide sleeve and the valve flap, so that the middle valve body adopts a cylindrical structure, and the left end of the middle valve body is coaxially sealed and fixedly connected with the connecting portion of the left valve body, so that the right valve body is provided with an air outlet passage along the axis, and the left end of the right valve body is coaxially sealed and fixedly connected with the right end of the middle valve body The shaft seal is fixedly connected, and the pressure regulating assembly is provided with a piston and a valve cylinder. The piston is arranged between the guide sleeve and the right valve body and is slidably sealed with the middle valve body. The valve cylinder is sealed and fixed in the middle of the piston, wherein the left half of the valve cylinder is in the guide sleeve and the two are slidably sealed with each other, the right half of the valve cylinder is in the right valve body and the two are slidably sealed with each other, the space between the piston and the left valve body is an inflation chamber, the space between the piston and the right valve body is a feedback chamber, the feedback chamber is connected with the air outlet channel through a feedback channel arranged in the right valve body, and the left valve body, the middle valve body, the right valve body, the valve disc, the guide sleeve, the piston and the valve cylinder are all made of austenitic stainless steel. Thus, an ultra-high pressure axial flow gas pressure regulator with simple structure, easy processing, safety, reliability and strong practicality is formed. In practical application, the pressure regulator is set in the pressure regulating pipeline through the left valve body and the right valve body. The high pressure gas (hydrogen) enters the pressure regulator from the air inlet channel, flows through the vent hole of the valve disc, the pressure regulating gas channel and the inner cavity of the valve cylinder in turn to become low pressure gas, and flows out of the pressure regulator through the outlet channel. In this process, the pressure of the inflation chamber remains unchanged. When the pressure in the outlet channel decreases due to the increase of gas load, the pressure of the feedback chamber will decrease accordingly. At this time, the piston will move the valve cylinder to the right. The right movement of the valve cylinder will increase the pressure regulating gas channel, and correspondingly increase the pressure in the outlet channel, achieving the purpose of pressure regulation and stabilization; the working process when the pressure in the outlet channel increases due to the decrease of gas load is opposite to the above process, which will not be repeated here. The present invention provides an axial flow valve body composed of a left valve body, a middle valve body and a right valve body, which, on the one hand, simplifies the structure and reduces the difficulty of processing and manufacturing, and on the other hand, can effectively reduce noise; by providing a pressure regulating movable part composed of a piston and a valve cylinder, compared with a pressure regulator using a diaphragm as a pressure regulating movable part, the structural strength and durability are effectively improved, and the durability requirements for ultra-high pressure gas pressure regulation can be fully met; by making the left valve body, the middle valve body, the right valve body, the valve disc, the guide sleeve, the piston and the valve cylinder all made of austenitic stainless steel, hydrogen embrittlement is avoided, and the hydrogen pressure regulation requirements can be fully met.

[0015] The following is a detailed description of an ultra-high pressure axial flow gas pressure regulator of the present invention in conjunction with the specific embodiments shown in the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1The structure of the existing voltage regulator is shown in FIG. Figure 1 ;

[0017] Figure 2 The structure of the existing voltage regulator is shown in FIG. Figure 2 ;

[0018] Figure 3 It is a structural schematic diagram of an ultra-high pressure axial flow gas pressure regulator of the present invention;

[0019] Figure 4 for Figure 3 A partial enlarged view of position A in the middle;

[0020] Figure 5 It is a schematic diagram of the hard seal structure of the filling and exhaust needle valve in the existing pressure regulator;

[0021] Figure 6 Schematic diagram of the soft sealing structure of the exhaust valve in the present invention;

[0022] Figure 7 It is a schematic diagram of the sealing structure between the piston and the middle valve body in the present invention. DETAILED DESCRIPTION

[0023] First of all, it should be explained that the directional words such as up, down, left, right, front and back described in the present invention are only described according to the drawings for the convenience of understanding, and are not intended to limit the technical solution and the scope of protection of the present invention.

[0024] like Figure 3 , Figure 4 , Figure 6 and Figure 7The specific embodiment of the ultra-high pressure axial flow gas pressure regulator of the present invention is shown, comprising a left valve body 1, a middle valve body 2, a right valve body 3 and a pressure regulating assembly. The left valve body 1 is provided with an air inlet passage 11 along the axis, an annular connecting portion 12 is provided in the middle of the outer side of the left valve body 1, and a valve flap 4 and a guide sleeve 5 are sealed and fixed at the right end of the left valve body 1, wherein the valve flap 4 is provided with vent holes 41 distributed along the circumferential direction, and a pressure regulating airway 6 is formed between the guide sleeve 5 and the valve flap 4. The middle valve body 2 adopts a cylindrical structure, and the left end of the middle valve body 2 is coaxially sealed and fixedly connected with the connecting portion 12 of the left valve body 1. The right valve body 3 is provided with an air outlet passage 31 along the axis, and the left end of the right valve body 3 is coaxially sealed and fixedly connected with the right end of the middle valve body 2. The pressure regulating assembly is provided with a piston 7 and a valve cylinder 8, the piston 7 is provided between the guide sleeve 5 and the right valve body 3 and is slidably sealed with the middle valve body 2, the valve cylinder 8 is sealed and fixed in the middle of the piston 7, the left half of the valve cylinder 8 is in the guide sleeve 5 and the two are slidably sealed, and the right half of the valve cylinder 8 is in the right valve body 3 and the two are slidably sealed. Among them, the space between the piston 7 and the left valve body 1 is the inflation chamber 9, the space between the piston 7 and the right valve body 3 is the feedback chamber 10, and the feedback chamber 10 is connected with the air outlet channel 31 through the feedback channel 32 provided in the right valve body 3; the left valve body 1, the middle valve body 2, the right valve body 3, the valve disc 4, the guide sleeve 5, the piston 7 and the valve cylinder 8 are all made of austenitic stainless steel.

[0025] The above arrangement constitutes an ultra-high pressure axial flow gas pressure regulator with simple structure, easy processing, safety, reliability and strong practicality. In practical application, the pressure regulator is arranged in the pressure regulating pipeline through the left valve body 1 and the right valve body 3. The high pressure gas (hydrogen) enters the pressure regulator from the air inlet channel 11, and becomes low pressure gas after passing through the vent hole 41 of the valve disc 4, the pressure regulating gas channel 6 and the inner cavity of the valve cylinder 8 in sequence, and flows out of the pressure regulator through the outlet channel 31. In this process, the pressure of the charging chamber 9 remains unchanged. When the pressure in the outlet channel 31 decreases due to the increase of gas load, the pressure of the feedback chamber 10 will decrease accordingly. At this time, the piston 7 will move the valve cylinder 8 to the right. The rightward movement of the valve cylinder 8 will increase the pressure regulating gas channel 6, and correspondingly increase the pressure in the outlet channel 31, thereby achieving the purpose of pressure regulation and stabilization. The working process when the pressure in the outlet channel 31 increases due to the decrease of gas load is opposite to the above process, which will not be repeated here. The present invention provides an axial flow valve body composed of a left valve body 1, a middle valve body 2 and a right valve body 3, which, on the one hand, simplifies the structure and reduces the difficulty of processing and manufacturing, and on the other hand, can effectively reduce noise; by providing a pressure regulating movable part composed of a piston 7 and a valve cylinder 8, compared with a pressure regulator using a diaphragm as a pressure regulating movable part, the structural strength and durability are effectively improved, and the durability requirements for ultra-high pressure gas pressure regulation can be fully met; by making the left valve body 1, the middle valve body 2, the right valve body 3, the valve disc 4, the guide sleeve 5, the piston 7 and the valve cylinder 8 all made of austenitic stainless steel, hydrogen embrittlement is avoided, and the hydrogen pressure regulation requirements can be fully met.

[0026] As a specific embodiment, the present invention sets a vertical charging channel 13 connected to the air inlet channel 11 and a transverse charging channel 14 connected to the charging chamber 9 at the connection portion 12 of the left valve body 1, and sets a charging valve 15 for controlling the on-off of the transverse charging channel 14 and the vertical charging channel 13 at the connecting position of the transverse charging channel 14 and the vertical charging channel 13; at the same time, an exhaust channel 21 connecting the charging chamber 9 and the atmosphere, and an exhaust valve 22 for controlling the on-off of the exhaust channel 21 are also set on the middle valve body 2. This setting allows the charging chamber 9 to be filled with a certain pressure of gas through the vertical charging channel 13, the transverse charging channel 14 and the charging valve 15, and the gas in the charging chamber 9 can be discharged through the exhaust channel 21 and the exhaust valve 22 to reduce the pressure, thereby improving the convenience of operation. As an optimization solution, this specific embodiment adopts the following installation and sealing method for the inflation valve 15 and the exhaust valve 22: a first step hole coaxial with the vertical inflation channel 13 is provided on the connecting portion 12, the inflation valve 15 is installed in the first step hole by means of threads, and a first sealing gasket 151 is provided at the lower end of the inflation valve 15 and is extruded around the upper port of the vertical inflation channel 13; similarly, a second step hole coaxial with the exhaust channel 21 is provided on the middle valve body 2, the exhaust valve 22 is installed in the second step hole by means of threads, and a second sealing gasket 221 is provided at the lower end of the exhaust valve 22 and is extruded around the upper port of the exhaust channel 21, and the first sealing gasket 151 and the second sealing gasket 221 are made of rubber. This arrangement only requires tightening the inflation valve 15 to seal the vertical inflation channel 13 through the first sealing gasket 151 to cut off the passage between the transverse inflation channel 14 and the vertical inflation channel 13. On the contrary, only by loosening the inflation valve 15 and placing the first sealing gasket 151 at the upper side of the transverse inflation channel 14, the transverse inflation channel 14 can be connected to the vertical inflation channel 13 and the purpose of filling the inflation chamber 9 with fuel gas can be achieved. The working principle and operation process of the exhaust valve 22 are the same as those of the inflation valve 15 and will not be repeated here. However, it should be pointed out that in order to achieve the purpose of exhaust, an exhaust groove is provided on the peripheral wall of the second stepped hole on the upper side of the exhaust channel 21. Compared with the hard sealing structure adopted by the inflation and exhaust needle valves in the existing pressure regulator, the present invention improves the sealing reliability by adopting a soft sealing structure for the inflation valve 15 and the exhaust valve 22.

[0027] As an optimization solution, this specific embodiment allows the left end of the right valve body 3 to be fixedly connected to the right end of the middle valve body 2 by screws to improve the convenience of disassembly and assembly, and a positioning ring 33 extending into the middle valve body 2 is provided on the right valve body 3 to achieve the purpose of assembly positioning, and a first sealing ring 34 extruded on the middle valve body 2 is installed on the outer peripheral wall of the positioning ring 33 through a first sealing groove to ensure sealing reliability. At the same time, this specific embodiment forms a second sealing groove between the left end face of the positioning ring 33 and the middle valve body 2, and a second sealing ring 23 and a sealing ring 24 are provided in the second sealing groove. Among them, the first sealing ring 34 and the second sealing ring 23 are made of rubber, and the sealing ring 24 is made of polytetrafluoroethylene and is attached to the piston 7. This arrangement ensures the sealing reliability between the sealing ring 24 and the piston 7 by adopting a sealing structure in which the second sealing ring 23 and the sealing ring 24 are matched, and the sealing ring 24 is made of polytetrafluoroethylene. Since polytetrafluoroethylene has no elasticity, the present invention arranges a second sealing groove between the positioning ring platform 33 and the middle valve body 2. Compared with the existing hole sealing structure (installing the sealing ring on the peripheral wall of the piston 7), on the one hand, the assembly convenience is improved, and on the other hand, the processing difficulty is reduced, and there is no need to polish the inner wall of the middle valve body.

[0028] As a specific embodiment, the present invention makes the left valve body 1 and the middle valve body 2 adopt the following connection and fixing method: the connection part 12 of the left valve body 1 is fixedly connected to the left end of the middle valve body 2 by screws to improve the convenience of disassembly and assembly, and the third sealing ring 25 made of rubber and extruded on the connection part 12 is installed at the left end of the middle valve body 2 through the third sealing groove to ensure the sealing performance between the two. As a specific embodiment, the present invention also makes the guide sleeve 5 fixed to the right end of the left valve body 1 by screws, and the valve disc 4 is clamped between the left valve body 1 and the guide sleeve 5 to improve the convenience of disassembly and assembly, and the first sealing member 16 is clamped between the left valve body 1, the valve disc 4 and the guide sleeve 5 to ensure the sealing performance. Similarly, in this specific embodiment, the second sealing member 43 cooperating with the valve cylinder 8 is fixed on the right side of the valve disc 4 by screws and a pressure plate 42. In practical applications, the first sealing member 16 and the second sealing member 43 can adopt the structural form of a sealing ring or a sealing gasket, as long as the sealing effect can be achieved. As a specific implementation, the present invention makes the valve cylinder 8 and the piston 7 adopt the following fixing method: a limit ring 81 is set on the peripheral wall of the valve cylinder 8, and the limit ring 81 is clamped in the groove correspondingly set on the left side of the piston 7, and a pressure ring 71 fixed on the piston 7 by screws is set on the left side of the limit ring 81. This setting has the characteristics of simple structure and convenient disassembly and assembly. In order to ensure the sealing between the two, the present invention also sets a third sealing member between the valve cylinder 8 and the piston 7. The third sealing member can also adopt a sealing ring or a sealing gasket. As a specific implementation, in order to ensure the sealing between the guide sleeve 5 and the valve cylinder 8, the present invention installs a fourth sealing ring 51 squeezed on the valve cylinder 8 through the fourth sealing groove on the inner wall of the guide sleeve 5; similarly, a fifth sealing ring 35 squeezed on the valve cylinder 8 is installed on the inner wall of the right valve body 3 through the fifth sealing groove.

[0029] In practical applications, in order to facilitate installation and connection, the present invention sets an inlet flange 17 at the left end of the left valve body 1, and installs an inlet pressure gauge 18 on the inlet flange 17, and makes the inlet of the inlet pressure gauge 18 communicate with the inlet channel 11 through the inlet pressure channel 18, so that the pressure in the inlet channel 11 can be intuitively understood through the inlet pressure gauge 18. Similarly, the present invention sets an outlet flange 36 at the right end of the right valve body 3 for easy installation and connection, and installs an outlet pressure gauge 37 on the outlet flange 36, and makes the inlet of the outlet pressure gauge 37 communicate with the outlet channel 31 through the outlet pressure channel 38, so that the pressure in the outlet channel 31 can be intuitively understood through the outlet pressure gauge 37.

[0030] The above embodiments are only descriptions of the preferred implementation modes of the present invention, and are not intended to limit the protection scope of the present invention. Without departing from the design concept of the present invention, various modifications made by those skilled in the art based on the technical solution of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. An ultra-high pressure axial flow gas pressure regulator, characterized in that: The invention comprises a left valve body (1), a middle valve body (2), a right valve body (3) and a pressure regulating assembly, wherein the left valve body (1) is provided with an air inlet passage (11) along the axis, an annular connecting portion (12) is provided at the middle part of the outer side of the left valve body (1), a valve flap (4) and a guide sleeve (5) are sealed and fixed at the right end of the left valve body (1), the valve flap (4) is provided with air vents (41) distributed along the circumferential direction, a pressure regulating air passage (6) is formed between the guide sleeve (5) and the valve flap (4), the middle valve body (2) is cylindrical, the left end of the middle valve body (2) is coaxially sealed and fixedly connected with the connecting portion (12) of the left valve body (1), the right valve body (3) is provided with an air outlet passage (31) along the axis, the left end of the right valve body (3) is coaxially sealed and fixedly connected with the right end of the middle valve body (2), the pressure regulating assembly comprises a piston (7) and a valve cylinder (8), the movable The plug (7) is located between the guide sleeve (5) and the right valve body (3) and is in sliding and sealing cooperation with the middle valve body (2); the valve cylinder (8) is sealed and fixed in the middle of the piston (7); the left half of the valve cylinder (8) is located in the guide sleeve (5) and the two are in sliding and sealing cooperation; the right half of the valve cylinder (8) is located in the right valve body (3) and the two are in sliding and sealing cooperation; the space between the piston (7) and the left valve body (1) is an air charging chamber (9); the space between the piston (7) and the right valve body (3) is a feedback chamber (10); the feedback chamber (10) is connected to the air outlet channel (31) through a feedback channel (32) arranged in the right valve body (3); the left valve body (1), the middle valve body (2), the right valve body (3), the valve disc (4), the guide sleeve (5), the piston (7) and the valve cylinder (8) are all made of austenitic stainless steel.

2. The ultra-high pressure axial flow gas pressure regulator according to claim 1, characterized in that: The connecting portion (12) of the left valve body (1) is provided with a vertical inflation channel (13) communicating with the air inlet channel (11), and a transverse inflation channel (14) communicating with the inflation chamber (9); a inflation valve (15) for controlling the on-off of the transverse inflation channel (14) and the vertical inflation channel (13) is provided at the connecting portion; an exhaust channel (21) communicating with the inflation chamber (9) and the atmosphere, and an exhaust valve (22) for controlling the on-off of the exhaust channel (21) are provided on the middle valve body (2).

3. The ultra-high pressure axial flow gas pressure regulator according to claim 2, characterized in that: The connecting portion (12) is provided with a first stepped hole coaxial with the vertical inflation channel (13); the inflation valve (15) is installed in the first stepped hole by means of threads; the lower end of the inflation valve (15) is provided with a first sealing gasket (151) extruded around the upper end of the vertical inflation channel (13); the middle valve body (2) is provided with a second stepped hole coaxial with the exhaust channel (21); the exhaust valve (22) is installed in the second stepped hole by means of threads; the lower end of the exhaust valve (22) is provided with a second sealing gasket (221) extruded around the upper end of the exhaust channel (21); the first sealing gasket (151) and the second sealing gasket (221) are made of rubber.

4. The ultra-high pressure axial flow gas pressure regulator according to claim 3, characterized in that: The left end of the right valve body (3) is fixedly connected to the right end of the middle valve body (2) by means of screws. The right valve body (3) is provided with a positioning ring platform (33) extending into the middle valve body (2). A first sealing ring (34) pressed onto the middle valve body (2) is installed on the outer peripheral wall of the positioning ring platform (33) through a first sealing groove. A second sealing groove is formed between the left end surface of the positioning ring platform (33) and the middle valve body (2). A second sealing ring (23) and a sealing ring (24) are provided in the second sealing groove. The first sealing ring (34) and the second sealing ring (23) are made of rubber, and the sealing ring (24) is made of polytetrafluoroethylene and is attached to the piston (7).

5. The ultra-high pressure axial flow gas pressure regulator according to claim 4, characterized in that: The connecting portion (12) of the left valve body (1) is fixedly connected to the left end of the middle valve body (2) by means of screws, and a third sealing ring (25) made of rubber and extruded on the connecting portion (12) is installed at the left end of the middle valve body (2) through a third sealing groove.

6. The ultra-high pressure axial flow gas pressure regulator according to claim 4, characterized in that: The guide sleeve (5) is fixed to the right end of the left valve body (1) by means of screws, the valve flap (4) is clamped between the left valve body (1) and the guide sleeve (5), and a first sealing member (16) is clamped between the left valve body (1), the valve flap (4) and the guide sleeve (5).

7. The ultra-high pressure axial flow gas pressure regulator according to claim 4, characterized in that: A second sealing member (43) cooperating with the valve cylinder (8) is fixed to the right side of the valve flap (4) via screws and a pressure plate (42).

8. The ultra-high pressure axial flow gas pressure regulator according to claim 4, characterized in that: A limiting ring (81) is provided on the peripheral wall of the valve cylinder (8), and the limiting ring (81) is clamped in a corresponding groove on the left side of the piston (7). A pressure ring (71) is provided on the left side of the limiting ring (81) and is fixed to the piston (7) by screws.

9. The ultra-high pressure axial flow gas pressure regulator according to claim 4, characterized in that: A fourth sealing ring (51) pressed onto the valve cylinder (8) is installed on the inner wall of the guide sleeve (5) via a fourth sealing groove, and a fifth sealing ring (35) pressed onto the valve cylinder (8) is installed on the inner wall of the right valve body (3) via a fifth sealing groove.

10. The ultra-high pressure axial flow gas pressure regulator according to claim 4, characterized in that: The left end of the left valve body (1) is provided with an air inlet flange (17), an air inlet pressure gauge (18) is installed on the air inlet flange (17), and the air inlet of the air inlet pressure gauge (18) is connected to the air inlet channel (11) through the air inlet pressure channel (18); the right end of the right valve body (3) is provided with an air outlet flange (36), an air outlet pressure gauge (37) is installed on the air outlet flange (36), and the air inlet of the air outlet pressure gauge (37) is connected to the air outlet channel (31) through the air outlet pressure channel (38).

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