A pressure reducing valve structure

Abstract

A pressure reducing valve structure includes: a valve body, provided with a valve cavity, the valve cavity is provided with an air inlet and an air outlet; an outer valve core is arranged inside the valve cavity and can move in the up and down directions, the upper part of the outer valve core is provided with a first outer core segment and the lower part is provided with a second outer core segment, a first outer cavity is formed between the inner peripheral wall and the upper side wall of the valve cavity and the first outer core segment, and the air inlet is connected to the first outer cavity; the inner peripheral wall of the valve cavity is provided with a pressure platform located below the second outer core segment, a second outer cavity is formed between the inner peripheral wall of the valve cavity, the pressure platform and the second outer core segment, the outer valve core is provided with an air inlet connected to the first outer cavity, a diversion hole connected to the air inlet and the second outer cavity, a pressure reducing cavity with one end connected to the air inlet and the other end extending to the bottom of the outer valve core; an external elastic member is arranged between the valve cavity and the outer valve core. The above scheme not only realizes the effective pressure reduction of gas, but also because of the good gas fluidity, the outer valve core can quickly achieve dynamic balance, is not easily disturbed, and has good reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure reducing valves, and in particular to a pressure reducing valve structure. Background Art

[0002] A pressure reducing valve is a valve used to reduce the input pressure of a gas to a desired output pressure, relying on the flow of the gas medium itself to maintain a stable output pressure. A pressure reducing valve generally consists of a valve body, a valve core, and a spring. The valve body is equipped with a valve cavity, a high-pressure inlet, and a low-pressure outlet. The valve core is located within the valve cavity and engages with the high-pressure inlet under the thrust of the spring. The smaller the distance between the valve core and the high-pressure inlet, the less high-pressure gas can flow into the valve cavity, and the lower the pressure output from the low-pressure outlet, resulting in a more pronounced pressure-reducing effect. Conversely, the larger the distance between the valve core and the high-pressure inlet, the more high-pressure gas can flow into the valve cavity, and the higher the pressure output from the low-pressure outlet, resulting in a less pronounced pressure-reducing effect. It can be seen that this type of pressure reducing valve achieves its output pressure regulation function by controlling the degree of opening and closing between the valve core and the high-pressure inlet.

[0003] In the existing solution, when the forward thrust of the high-pressure gas from the high-pressure inlet on the valve core equals the total reverse thrust of the spring on the valve core and the gas in the valve cavity on the valve core, the valve core reaches a temporary stable state. At this time, the distance between the valve core and the high-pressure inlet remains unchanged, and the low-pressure outlet outputs a stable air pressure. However, this existing solution mainly relies on the spring to offset the thrust of the high-pressure gas from the high-pressure inlet on the valve core. Once the air pressure at the high-pressure inlet fluctuates, the spring itself is prone to oscillation and instability, which will cause the valve core to oscillate, and then cause the air pressure inside the valve cavity to fluctuate violently, which has an adverse effect on the output air pressure of the low-pressure outlet.

[0004] In addition, some existing pressure reducing valves are designed with multiple overflow holes in the valve body. Under normal operating conditions, the overflow holes are closed by the valve core, and the gas flowing into the high-pressure air inlet is normally reduced in pressure through the valve cavity and flows to the low-pressure air outlet. However, when the gas pressure at the high-pressure air inlet is too high, the valve core will be pushed by the gas at the high-pressure air inlet and move, causing the overflow holes to open. The interior of the valve cavity is connected to the outside world through the overflow holes, thereby improving the pressure reduction effect of the gas in the valve cavity. This type of pressure reducing valve will also cause the air pressure inside the valve cavity to fluctuate violently when the valve core just opens the overflow hole, which will adversely affect the output air pressure of the low-pressure air outlet. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem in the prior art that the air pressure inside the valve cavity of the pressure reducing valve is easily disturbed, resulting in unstable output air pressure.

[0006] To solve the above problems, the present invention provides a pressure reducing valve structure, comprising:

[0007] The valve body is provided with a valve cavity, wherein the top of the valve cavity is provided with an air inlet and the bottom is provided with an air outlet;

[0008] The cam is secured to the bottom of the valve body and has a camming feature which allows the camming engine to move in a controlled manner without over-running the valve body and out of the way when the vent is inflated.

[0009] an external elastic member, disposed between the valve cavity and the outer valve core and used for providing a downward elastic thrust to the outer valve core;

[0010] When the sum of the downward gas thrust exerted on the outer valve core and the elastic thrust of the outer elastic member is equal to the upward gas thrust exerted on the outer valve core, the outer valve core reaches a stable state.

[0011] When the throttle is turned off, the throttle body is in a reverse direction and the throttle body is turned off. When the throttle body is turned off, the throttle body is turned off, and the throttle body is turned off. When the throttle body is turned off, the throttle body is turned off, and the throttle body is turned off. When the throttle body is turned off, the throttle body is turned off, and the throttle body is turned off. When the throttle body is turned off, the throttle body is turned off, and the throttle body is turned off. When the throttle body is turned off, the throttle body is turned off, and the throttle body is turned off. When the air pressure flowing into the first outer cavity from the air inlet increases, the downward air thrust acting on the outer valve core will increase, causing the outer valve core to move downward. At this time, the air pressure in the second outer cavity increases due to compression, causing the outer valve core to quickly regain a state of force equilibrium; when the air pressure flowing into the first outer cavity from the air inlet decreases, the downward air thrust acting on the outer valve core will decrease, causing the outer valve core to move upward. At this time, the air pressure in the second outer cavity decreases due to expansion, causing the outer valve core to quickly regain a state of force equilibrium.

[0012] Compared with the prior art, the above scheme enables the gas in the first outer chamber to enter the second outer chamber through the diversion hole set in the outer valve core, thereby relying on the upward gas thrust of the gas in the second outer chamber on the outer valve core to resist the downward gas thrust of the high-pressure gas at the air inlet on the outer valve core, replacing the prior art scheme of relying solely on the spring to offset the downward thrust of the high-pressure gas, thereby avoiding the problem of valve core oscillation caused by spring oscillation, which in turn makes the air pressure at the air outlet unstable. At the same time, the outer valve core of the above-mentioned scheme also relies on the downward elastic thrust provided by the outer elastic member in the process of offsetting the upper and lower air thrusts. Specifically, when the air pressure at the air inlet suddenly increases, the outer valve core, which was originally in a stable state, will move downward. Due to the gas fluidity factor, the air pressure in the decompression chamber and the air pressure in the second outer chamber will increase accordingly. At the same time, it is precisely because of the downward movement of the outer valve core that the downward elastic thrust applied by the outer elastic member to the outer valve core is reduced, so that the impact of the sudden increase in the air pressure at the air inlet on the air pressure in the second outer chamber is weakened, effectively reducing the degree of disturbance of the outer valve core, thereby ensuring the stability of the gas pressure output from the decompression chamber. In other words, compared with the prior art, the external elastic member of this scheme compensates for the downward air thrust fluctuations on the outer valve core by applying a downward elastic thrust to the outer valve core. Under the same conditions, the air pressure in the second outer chamber only needs a smaller change and a shorter time to offset the impact of the increase in the downward air thrust on the outer valve core caused by the sudden increase in the air pressure at the air inlet, so that the outer valve core can return to a steady state faster. On the contrary, when the air pressure at the air inlet suddenly drops, the outer valve core, which was originally in a stable state, will be moved upward. In view of the gas fluidity factor, the air pressure in the decompression chamber and the air pressure in the second outer chamber will decrease as the air pressure in the first outer chamber decreases. At the same time, it is precisely because the valve core moves upward that the downward elastic thrust applied by the outer elastic member to the outer valve core increases, so that the impact of the sudden drop in air pressure at the air inlet on the outer valve core is weakened, effectively reducing the degree of disturbance of the outer valve core, thereby ensuring the stability of the gas pressure output by the decompression chamber; similarly, because the outer elastic member applies a downward elastic thrust to the outer valve core, it compensates for the downward air thrust fluctuations on the outer valve core. Under the same conditions, the air pressure in the second outer chamber only needs a smaller change and a shorter time to offset the impact of the reduction in downward air thrust on the outer valve core caused by the sudden drop in air pressure at the air inlet, so that the outer valve core can reach a steady state again more quickly.

[0013] Preferably, the outer peripheral wall of the outer valve core is provided with an annular accommodating groove, the outer elastic member is a spring and is sleeved in the accommodating groove, the upper end of the outer elastic member is connected to the valve cavity and the lower end abuts against the groove wall of the accommodating groove, and the side wall of the valve body is provided with an external air vent connecting the accommodating groove and the outside of the valve body, thereby ensuring a compact structure on the one hand, and on the other hand connecting the area between the valve cavity and the accommodating groove with the outside world through the external air vent, and ensuring that the air pressure in the area between the valve cavity and the accommodating groove is always stable when the outer valve core moves up and down.

[0014] Preferably, a gap is left between the upper part of the outer peripheral wall of the first outer core segment and the inner peripheral wall of the valve cavity, and the lower part of the outer peripheral wall of the first outer core segment protrudes to form a ring-shaped first external connecting platform. The outer peripheral wall of the first external connecting platform slides to fit into the inner peripheral wall of the valve cavity, and the first external connecting platform and the valve cavity are sealed with each other. The first outer cavity is formed by the inner peripheral wall, upper side wall, upper part of the first outer core segment and the first external connecting platform of the valve cavity, so as to ensure that when the first outer cavity is inflated, the first external connecting platform will be subjected to a downward thrust, thereby causing the outer valve core to have a downward movement tendency.

[0015] Preferably, the upper part of the outer peripheral wall of the second outer core segment protrudes to form an annular second external connecting platform, the outer peripheral wall of the second external connecting platform slides to fit into the inner peripheral wall of the valve cavity, and a gap is left between the lower part of the outer peripheral wall of the second outer core segment and the inner peripheral wall of the valve cavity. The second outer cavity is formed by the inner peripheral wall of the valve cavity, the pressure platform, the lower part of the second outer core segment and the second external connecting platform, so as to ensure that when the second outer cavity is inflated, the second external connecting platform will be subjected to an upward thrust, thereby causing the outer valve core to have a tendency to move upward.

[0016] Preferably, the air inlet includes a vertical hole section and at least two transverse hole sections, and the transverse hole sections are all connected from the upper outer peripheral wall of the first outer core section to the first outer cavity, and the transverse hole sections are centrally symmetrically distributed relative to the vertical hole sections. The upper end of the vertical hole section is connected to all the transverse hole sections and the lower end is connected to the decompression cavity, so that the high-pressure gas in the first outer cavity is initially decompressed through the transverse hole section and the vertical hole section before flowing to the decompression cavity and the diversion hole, thereby avoiding excessive pressure changes in the decompression cavity and the diversion hole.

[0017] Preferably, there are at least two diversion holes and they are centrally symmetrically distributed relative to the vertical hole section. The upper end of the diversion hole is connected to the vertical hole section and the lower end is connected from the outer peripheral wall of the second outer core section to the second outer cavity, thereby ensuring that the gas can flow into the second outer cavity more evenly through the diversion holes, and the more diversion holes there are, the faster the gas in the first outer cavity can flow into the second outer cavity.

[0018] Preferably, the bottom of the outer valve core is sealed and connected with a cover, and the cover is provided with a gas nozzle arranged vertically, the upper end of the gas nozzle is communicated with the decompression chamber and the lower end is staggered with the air outlet, so that the distance between the lower end of the gas nozzle and the bottom surface of the valve chamber determines the gas flow rate that can flow from the decompression chamber to the air outlet, the structure is simple, and the control is stable.

[0019] Preferably, the above scheme also includes an inner valve core and an inner elastic member, the inner valve core is vertically arranged inside the decompression chamber and can move in the up and down directions, the top of the inner valve core is provided with an inner plug for matching the vertical hole section, a first inner cavity is formed between the upper part of the inner valve core and the inner circumferential wall and the upper side wall of the decompression chamber, the vertical hole section is connected to the first inner cavity, and when the first inner cavity is inflated, the inner valve core is subjected to a downward gas thrust; a second inner cavity is formed between the lower part of the inner valve core, the inner circumferential wall of the decompression chamber and the cover The inner valve core is provided with an inner air hole connected to the first inner cavity, and an air guide hole connected to the inner air hole and the second inner cavity. The inner diameter of the air nozzle is smaller than that of the second inner cavity. When the second inner cavity is inflated, the inner valve core is subjected to an upward air thrust. The inner elastic member is arranged between the decompression chamber and the inner valve core and is used to provide a downward elastic thrust to the inner valve core. When the sum of the downward air thrust applied to the inner valve core and the elastic thrust of the inner elastic member equals the upward air thrust applied to the inner valve core, the inner valve core reaches a stable state. The configuration of the inner valve core realizes a two-stage decompression function.

[0020] Preferably, the upper part of the inner peripheral wall of the decompression chamber is provided with a first cavity section with a reduced inner diameter, and the upper part of the outer peripheral wall of the inner valve core protrudes to form an annular first internal connecting platform, the first internal connecting platform slides into the first cavity section and the first internal connecting platform and the first cavity section are sealed with each other, and the first inner cavity is formed by the upper side wall, the inner peripheral wall, the upper part of the inner valve core, and the first internal connecting platform of the decompression chamber, so as to ensure that when the first inner cavity is inflated, the first internal connecting platform will be subjected to a downward gas thrust, thereby causing the inner valve core to have a tendency to move downward.

[0021] Preferably, the lower part of the inner circumferential wall of the decompression chamber is provided with a second cavity section with an enlarged inner diameter, and the lower part of the outer circumferential wall of the inner valve core protrudes to form an annular second internal connecting platform, the second internal connecting platform slides into the second cavity section and the second internal connecting platform and the second cavity section are sealed with each other, and the second inner cavity is formed by the inner circumferential wall of the decompression chamber, the lower part of the inner valve core, the second internal connecting platform and the sealing cover, so as to ensure that when the second inner cavity is inflated, the second internal connecting platform will be subjected to an upward gas thrust, thereby causing the inner valve core to have a tendency to move upward.

[0022] Preferably, the decompression chamber also includes a third chamber section located between the first chamber section and the second chamber section, the inner diameter of the third chamber section is between the first chamber section and the second chamber section, the inner elastic member is a spring and is sleeved on the outside of the inner valve core and is located in the third chamber section, the upper end of the inner elastic member is connected to the third chamber section and the lower end abuts against the upper side of the second inner connecting platform, the inner circumferential wall of the second chamber section is provided with an internal air vent that passes through the accommodating groove, thereby ensuring a compact structure on the one hand, and on the other hand, the area between the third chamber section and the inner valve core is connected to the accommodating groove through the internal air vent, and when the inner valve core moves up and down, the air pressure in the area between the third chamber section and the inner valve core is always stable; in addition, since the internal air vent is located between the first chamber section and the second chamber section, it is beneficial to the pressure balance between the upper and lower parts of the inner valve core.

[0023] Preferably, the air inlet is vertically penetrated to the top of the valve cavity and the aperture gradually increases from top to bottom. The outer plug is a conical structure with a diameter gradually increasing from top to bottom. The air outlet is horizontally penetrated to the inner circumferential wall of the bottom of the valve cavity. On the one hand, it ensures that the high-pressure gas at the air inlet can flow into the first outer cavity more evenly and stably. On the other hand, the axes of the air inlet and the air outlet are arranged perpendicular to each other, which is conducive to pressure reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of a pressure reducing valve of the present invention;

[0025] Figure 2 Schematic top view of a pressure reducing valve of the present invention;

[0026] Figure 3 For the Figure 2 Schematic diagram of the cross section along the AA section line a;

[0027] Figure 4 For the Figure 2 Sectional view of section line AA in the middle; b;

[0028] Figure 5 For the Figure 3 Schematic cross-sectional view of the middle BB section line;

[0029] Figure 6 For the Figure 3 Schematic cross-sectional view of the CC section line;

[0030] Figure 7 For the Figure 3 Schematic cross-sectional view of the DD section line.

[0031] Description of reference numerals:

[0032] 1. Valve body; 11. Valve cavity; 11a. First outer cavity; 11b. Second outer cavity; 12. Air inlet; 13. Air outlet; 14. External vent; 15. Pressure platform; 2. External valve core; 201. First outer core segment; 202. Second outer core segment; 203. First external connection platform; 204. Second external connection platform; 21. External plug; 22. Sealing cover; 221. Air nozzle; 23. Air inlet; 231. Horizontal hole segment; 232. Vertical Hole section; 24, decompression chamber; 241, first chamber section; 241a, first inner chamber; 242, second chamber section; 242a, second inner chamber; 243, third chamber section; 25, diverter hole; 26, receiving groove; 27, inner air vent; 3, external elastic member; 4, internal valve core; 401, first internal connecting platform; 402, second internal connecting platform; 41, internal plug; 42, inner air hole; 43, air guide hole; 5, internal elastic member; 6, sealing ring. Specific embodiments

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. It should also be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, inside, and outside) are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] See also Figure 1-Figure 7 , an embodiment of the present invention provides a pressure reducing valve structure, comprising:

[0035] The valve body 1 is provided with a valve cavity 11, the top of the valve cavity 11 is provided with an air inlet 12 and the bottom is provided with an air outlet 13;

[0036] The outer valve core 2 is vertically arranged inside the valve cavity 11 and can move in the up and down directions. The top of the outer valve core 2 is provided with an outer plug 21 for matching the air inlet 12. The upper part of the outer valve core 2 is provided with a first outer core segment 201 and the lower part is provided with a second outer core segment 202. The inner peripheral wall, the upper side wall and the first outer core segment 201 of the valve cavity 11 form a first outer cavity 11a. The air inlet 12 is connected to the first outer cavity 11a. When the first outer cavity 11a is inflated, the outer valve core 2 is subjected to a downward gas thrust. The inner peripheral wall is raised to form a pressure platform 15 located below the second outer core segment 202. A second outer chamber 11b is formed between the inner peripheral wall of the valve cavity 11, the pressure platform 15 and the second outer core segment 202. The outer valve core 2 is provided with an air inlet 23 connected to the first outer chamber 11a, a diverter hole 25 connected to the air inlet 23 and the second outer chamber 11b, and a decompression chamber 24 with one end connected to the air inlet 23 and the other end extending to the bottom of the outer valve core 2. When the second outer chamber 11b is inflated, the outer valve core 2 is subjected to an upward gas thrust.

[0037] The outer elastic member 3 is provided between the valve chamber 11 and the outer valve core 2 and is used to provide a downward elastic thrust to the outer valve core 2;

[0038] When the sum of the downward gas thrust exerted on the outer valve core 2 and the elastic thrust of the outer elastic member 3 is equal to the upward gas thrust exerted on the outer valve core 2 , the outer valve core 2 reaches a stable state.

[0039] In the idle state, the outer valve core 2 is in a stationary state in the valve cavity 11. When the high-pressure gas enters the first outer cavity 11a from the air inlet 12, the outer valve core 2 will be subjected to the downward gas thrust of the high-pressure gas in the first outer cavity 11a. At this time, part of the gas in the first outer cavity 11a will flow from the air inlet 23 to the decompression cavity 24 and then flow to the air outlet 13 after the decompression is achieved. The other part of the gas will flow from the air inlet 23 through the diverter hole 25 to the second outer cavity 11b, so that the air pressure in the second outer cavity 11b continues to rise. The outer valve core 2 will be subjected to the downward gas thrust of the high-pressure gas in the first outer cavity 11a. The upward gas thrust exerted by the internal gas; when the sum of the downward gas thrust exerted on the outer valve core 2 and the elastic thrust of the external elastic member 3 is equal to the upward gas thrust exerted on the outer valve core 2, the outer valve core 2 reaches a stable state of force balance, at this time the distance between the outer plug 21 and the air inlet 12 remains stable, and the air outlet 13 outputs stable low-pressure gas; it should be noted here that the upward gas thrust exerted on the outer valve core 2 not only includes the upward gas thrust exerted on the outer valve core 2 by the second outer chamber 11b, but also includes the upward gas thrust exerted on the decompression chamber 24 and the bottom surface of the outer valve core 2. When the air pressure flowing into the first outer chamber 11a through the air inlet 12 increases, the downward air thrust acting on the outer valve core 2 will increase, causing the outer valve core 2 to move downward. At this time, the air pressure in the second outer chamber 11b increases due to compression, causing the outer valve core 2 to quickly regain a state of force equilibrium; when the air pressure flowing into the first outer chamber 11a through the air inlet 12 decreases, the downward air thrust acting on the outer valve core 2 will decrease, causing the outer valve core 2 to move upward. At this time, the air pressure in the second outer chamber 11b decreases due to expansion, causing the outer valve core 2 to quickly regain a state of force equilibrium.

[0040] Compared with the prior art, the above scheme enables the gas in the first outer chamber 11a to enter the second outer chamber 11b through the diversion hole 25 set in the outer valve core 2, thereby relying on the upward gas thrust of the gas in the second outer chamber 11b on the outer valve core 2 to resist the downward gas thrust of the high-pressure gas at the air inlet 12 on the outer valve core 2, replacing the prior art scheme of relying solely on the spring to offset the downward thrust of the high-pressure gas, thereby avoiding the problem of valve core oscillation caused by spring oscillation, which in turn causes unstable air pressure at the air outlet 13. At the same time, the outer valve core 2 of the above-mentioned scheme also uses the downward elastic thrust provided by the outer elastic member 3 in the process of offsetting the upper and lower air thrusts. Specifically, when the air pressure at the air inlet 12 suddenly increases, the outer valve core 2, which was originally in a stable state, will move downward. In view of the gas fluidity factor, the air pressure in the decompression chamber 24 and the air pressure in the second outer chamber 11b will increase accordingly. At the same time, it is precisely because of the downward movement of the outer valve core 2 that the downward elastic thrust applied by the outer elastic member 3 to the outer valve core 2 is reduced, so that the influence of the sudden increase in the air pressure at the air inlet 12 on the air pressure in the second outer chamber 11b is reduced. The outer valve core 2 is weak, which effectively reduces the degree of disturbance of the outer valve core 2, thereby ensuring the stability of the gas pressure output by the decompression chamber 24; in other words, compared with the prior art, the outer elastic member 3 of this scheme compensates for the downward gas thrust fluctuations received by the outer valve core 2 by applying a downward elastic thrust to the outer valve core 2. Under the same conditions, the air pressure in the second outer chamber 11b only needs a smaller change and a shorter time to offset the effect of the increase in the downward gas thrust received by the outer valve core 2 caused by the sudden increase in the air pressure at the air inlet 12, so that the outer valve core 2 can regain a steady state more quickly. On the contrary, when the air pressure at the air inlet 12 suddenly drops, the outer valve core 2, which was originally in a stable state, will be moved upward. In view of the gas fluidity factor, the air pressure in the decompression chamber 24 and the air pressure in the second outer chamber 11b decrease as the air pressure in the first outer chamber 11a decreases. At the same time, it is precisely because the valve core moves upward that the downward elastic thrust applied by the outer elastic member 3 to the outer valve core 2 increases, so that the impact of the sudden drop in air pressure at the air inlet 12 on the outer valve core 2 is weakened, effectively reducing the degree of disturbance of the outer valve core 2, thereby ensuring the stability of the gas pressure output by the decompression chamber 24; similarly, because the outer elastic member 3 compensates for the downward air thrust fluctuations on the outer valve core 2 by applying a downward elastic thrust to the outer valve core 2, under the same conditions, the air pressure in the second outer chamber 11b only needs a smaller change and a shorter time to offset the impact of the reduction in downward air thrust on the outer valve core 2 caused by the sudden drop in air pressure at the air inlet 12, so that the outer valve core 2 can return to a steady state more quickly.

[0041] It should be understood that the cross-sectional shape of the valve cavity 11 or the outer valve core 2 can be designed as needed, such as circular or polygonal. In this embodiment, the valve cavity 11 is a cavity with a circular cross-section, while the outer valve core 2 is a cylindrical structure, so that the outer valve core 2 is more stable when moving up and down in the valve cavity 11.

[0042] In this embodiment, a gap is left between the upper portion of the outer peripheral wall of the first outer core segment 201 and the inner peripheral wall of the valve cavity 11. The lower portion of the outer peripheral wall of the first outer core segment 201 protrudes to form an annular first external connection platform 203. The outer peripheral wall of the first external connection platform 203 slides into the inner peripheral wall of the valve cavity 11, and the first external connection platform 203 and the valve cavity 11 are sealed. The first outer cavity 11a is enclosed by the inner peripheral wall and upper side wall of the valve cavity 11, the upper portion of the first outer core segment 201, and the first external connection platform 203. This ensures that when the first outer cavity 11a is inflated, the first external connection platform 203 will be subjected to a downward air thrust, thereby causing the outer valve core 2 to move downward. Furthermore, a sealing ring 6 is provided on the upper side of the first external connection platform 203, and the sealing ring 6 abuts the inner peripheral wall of the valve cavity 11, thereby ensuring a good seal between the first external connection platform 203 and the valve cavity 11.

[0043] The upper portion of the outer wall of the second outer core segment 202 is raised to form an annular second external platform 204. The outer wall of the second external platform 204 slides against the inner wall of the valve cavity 11, and the second external platform 204 and the valve cavity 11 are sealed. A gap is left between the lower portion of the outer wall of the second outer core segment 202 and the inner wall of the valve cavity 11. The second outer cavity 11b is enclosed by the inner wall of the valve cavity 11, the pressure platform 15, the lower portion of the second outer core segment 202, and the second external platform 204. This ensures that when the second outer cavity 11b is inflated, the second external platform 204 will be subjected to an upward gas thrust, thereby causing the outer valve core 2 to have an upward movement trend. Furthermore, a sealing ring 6 is provided on the lower side of the second external platform 204, and the sealing ring 6 abuts against the inner wall of the valve cavity 11, thereby ensuring a good seal between the second external platform 204 and the valve cavity 11.

[0044] In this embodiment, an annular receiving groove 26 is provided on the outer peripheral wall of the central portion of the outer valve core 2. The receiving groove 26 is located between the first outer core segment 201 and the second outer core segment 202. The outer elastic member 3 is a spring, sleeved onto the outer side of the outer valve core 2 and positioned within the receiving groove 26. The upper end of the outer elastic member 3 is connected to the valve cavity 11, and the lower end abuts the wall of the receiving groove 26. The sidewall of the valve body 1 is provided with an external vent 14 connecting the receiving groove 26 with the outer side of the valve body 1. This ensures a compact structure while also connecting the area between the valve cavity 11 and the receiving groove 26 to the outside world through the external vent 14. This ensures that the air pressure in the area between the valve cavity 11 and the receiving groove 26 remains stable as the outer valve core 2 moves up and down. It should be understood that the receiving groove 26 can also be located on the upper or lower portion of the outer peripheral wall of the outer valve core 2, as long as it can accommodate the outer elastic member 3. The outer elastic member 3 can also take other forms, such as a disc spring or a tower spring, as long as it can exert a downward elastic force on the outer valve core 2.

[0045] The air inlet 23 preferably includes a vertical hole section 232 and at least two transverse hole sections 231. In this embodiment, there are four transverse hole sections 231, all arranged along the radial direction of the outer valve core 2. The angle between adjacent transverse hole sections 231 is 90°, and the transverse hole sections 231 are centrally symmetrically distributed relative to the vertical hole sections 232. The transverse hole sections 231 are connected to the first outer chamber 11a from the side of the first outer core section 201. The upper end of the vertical hole section 232 is connected to all the transverse hole sections 231, and the decompression chamber 24 is connected to the lower end of the vertical hole section 232. As a result, the high-pressure gas in the first outer chamber 11a is initially decompressed through the transverse hole sections 231 and the vertical hole sections 232 before flowing to the decompression chamber 24 and the diverter hole 25, thereby preventing excessive pressure changes in the decompression chamber 24 and the diverter hole 25.

[0046] There are at least two diverter holes 25, which are centrally symmetrically distributed relative to the vertical hole section 232. In this embodiment, there are six diverter holes 25, and the angle between adjacent diverter holes 25 is 90 degrees. The upper ends of the diverter holes 25 are connected to the middle of the vertical hole section 232, and the lower ends are connected from the outer peripheral wall of the second outer core section 202 to the second outer cavity 11b, thereby ensuring that gas can flow more evenly into the second outer cavity 11b through the diverter holes 25. The more diverter holes 25 there are, the faster the gas in the first outer cavity 11a can flow into the second outer cavity 11b.

[0047] In this embodiment, the bottom of the outer valve core 2 is sealed with a cover 22. The cover 22 is provided with a vertically arranged gas nozzle 221. The gas nozzle 221 is tubular, with the upper end of the gas nozzle 221 communicating with the decompression chamber 24 and the lower end being staggered with the gas outlet 13. The staggered arrangement of the lower end of the gas nozzle 221 and the gas outlet 13 means that the two are not directly connected. That is, when the lower end of the gas nozzle 221 abuts the lower side wall of the valve chamber 11, the decompression chamber 24 and the gas outlet 13 are blocked from each other. Only when the lower end of the gas nozzle 221 is separated from the lower side wall of the valve chamber 11 do the decompression chamber 24 and the gas outlet 13 communicate with each other. As a result, the distance between the lower end of the gas nozzle 221 and the bottom surface of the valve chamber 11 determines the gas flow rate that can flow from the decompression chamber 24 to the gas outlet 13. The structure is simple and the control is stable.

[0048] As a further expansion of the above embodiment, the above scheme also includes an inner valve core 4 and an inner elastic member 5. The inner valve core 4 is vertically arranged inside the decompression chamber 24 and can move in the up and down directions. The top of the inner valve core 4 is provided with an inner plug 41 arranged toward the vertical hole section 232. The distance between the inner plug 41 and the lower end of the vertical hole section 232 corresponds to the amount of gas that can flow into the decompression chamber 24 from the vertical hole section 232; a first inner cavity 241a is formed between the upper part of the inner valve core 4 and the inner circumferential wall and the upper side wall of the decompression chamber 24, and the vertical hole section 232 is connected to the first inner cavity 241a. When the first inner cavity 241a is inflated, the inner valve core 4 is subjected to a downward gas thrust. A second inner cavity 242a is formed between the lower portion of the inner valve core 4, the inner circumferential wall of the decompression chamber 24, and the cover 22. The inner valve core 4 is provided with an inner air hole 42 connected to the first inner cavity 241a, and an air guide hole 43 connecting the inner air hole 42 and the second inner cavity 242a. The inner diameter of the air nozzle 221 is smaller than that of the second inner cavity 242a. When the second inner cavity 242a is inflated, the inner valve core 4 is subjected to an upward air thrust. An internal elastic member 5 is disposed between the decompression chamber 24 and the inner valve core 4 and is used to provide a downward elastic thrust to the inner valve core 4. When the sum of the downward air thrust exerted on the inner valve core 4 and the elastic thrust of the internal elastic member 5 equals the upward air thrust exerted on the inner valve core 4, the inner valve core 4 reaches a stable state. Under normal operating conditions, gas flows downward from the vertical hole section 232 and enters the first inner cavity 241a, then flows into the second inner cavity 242a through the inner air hole 42 and the guide hole in sequence, and finally flows out from the gas nozzle 221 of the cover 22. Since the inner core of the gas nozzle 221 is smaller than the inner diameter of the second inner cavity 242a, the internal air pressure of the second inner cavity 242a will increase and exert an upward air thrust on the inner valve core 4. When the upward thrust of the gas in the second inner cavity 242a on the inner valve core 4 is equal to the sum of the downward thrust of the gas in the inner elastic member 5 on the inner valve core 4 and the gas in the first inner cavity 241a on the inner valve core 4, the inner valve core 4 can reach a stable state. At this time, the distance between the inner plug 41 and the vertical hole section 232 remains stable, and the gas can flow stably from the vertical hole section 232 to the gas nozzle 221 of the cover 22. The provision of the inner valve core 4 realizes a two-stage decompression function for the gas in the decompression chamber 24.

[0049] In this embodiment, the inner peripheral wall of the decompression chamber 24 includes a first chamber section 241 located at the upper portion and a second chamber section 242 located at the lower portion. The inner diameter of the second chamber section 242 is larger than that of the first chamber section 241 . The inner valve core 4 is preferably in the shape of a circular shaft, and the upper part of the outer peripheral wall of the inner valve core 4 protrudes to form an annular first internal connecting platform 401. The first internal connecting platform 401 slides into the first cavity section 241 and the first internal connecting platform 401 and the first cavity section 241 are sealed with each other. The first inner cavity 241a is formed by the upper side wall, the inner peripheral wall, the upper part of the inner valve core 4 and the first internal connecting platform 401 of the decompression cavity 24, thereby ensuring that when the first inner cavity 241a is inflated, the first internal connecting platform 401 will be subjected to a downward gas thrust, thereby causing the inner valve core 4 to have a tendency to move downward; further, a sealing ring 6 is provided on the upper side of the first internal connecting platform 401 and the sealing ring 6 abuts against the inner peripheral wall of the first cavity section 241, thereby improving the sealing between the first internal connecting platform 401 and the first cavity section 241. The lower part of the outer peripheral wall of the inner valve core 4 protrudes to form an annular second internal connecting platform 402, and the second internal connecting platform 402 slides to fit into the second cavity section 242 and the second internal connecting platform 402 and the second cavity section 242 are sealed with each other. The second inner cavity 242a is formed by the inner peripheral wall of the decompression cavity 24, the lower part of the inner valve core 4, the second internal connecting platform 402 and the cover 22, thereby ensuring that when the second inner cavity 242a is inflated, the second internal connecting platform 402 will be subjected to an upward gas thrust, thereby causing the inner valve core 4 to have an upward movement tendency; further, a sealing ring 6 is provided on the side of the second internal connecting platform 402 and the sealing ring 6 abuts against the inner peripheral wall of the second cavity section 242, thereby improving the sealing between the second internal connecting platform 402 and the second cavity section 242.

[0050] Furthermore, the decompression chamber 24 also includes a third chamber section 243 located between the first chamber section 241 and the second chamber section 242. The inner diameter of the third chamber section 243 is between the first chamber section 241 and the second chamber section 242. The inner elastic member 5 is a spring. The inner elastic member 5 is sleeved on the outer side of the middle part of the inner valve core 4 and is located in the third chamber section 243. The upper end of the inner elastic member 5 is connected to the third chamber section 243 and the lower end abuts against the upper side of the second inner connecting platform 402. The hole wall of the third chamber section 243 is provided with an internal air vent 27 connected to the accommodating groove 26, thereby ensuring a compact structure on the one hand. On the other hand, the area between the third chamber section 243 and the inner valve core 4 is connected to the accommodating groove 26 through the internal air vent 27. When the inner valve core 4 moves up and down, the air pressure in the area between the third chamber section 243 and the inner valve core 4 is always stable. In addition, since the internal air vent 27 is located between the first chamber section 241 and the second chamber section 242, it is beneficial to the pressure balance between the upper and lower parts of the inner valve core 4.

[0051] In this embodiment, the air inlet 12 penetrates vertically to the top of the valve cavity 11 and the aperture gradually increases from top to bottom. The outer plug 21 is a conical structure with a diameter gradually increasing from top to bottom. The air outlet 13 penetrates horizontally to the inner peripheral wall of the bottom of the valve cavity 11. On the one hand, it ensures that the high-pressure gas at the air inlet 12 can flow into the first outer cavity 11a more evenly and stably. On the other hand, the axes of the air inlet 12 and the air outlet 13 are arranged perpendicular to each other, which is conducive to decompression.

[0052] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. For those skilled in the art, various changes and modifications can be made without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the invention.

Claims

1. A pressure reducing valve structure, characterized in that: include: A valve body (1) is provided with a valve cavity (11), wherein the top of the valve cavity (11) is provided with an air inlet (12) and the bottom is provided with an air outlet (13); The outer valve core (2) is vertically arranged inside the valve cavity (11) and can move in the up and down directions. The top of the outer valve core (2) is provided with an outer plug (21) for matching the air inlet (12). The upper part of the outer valve core (2) is provided with a first outer core segment (201) and the lower part is provided with a second outer core segment (202). A first outer cavity (11a) is formed between the inner peripheral wall and the upper side wall of the valve cavity (11) and the first outer core segment (201). The air inlet (12) is connected to the first outer cavity (11a). When the first outer cavity (11a) is inflated, the outer valve core (2) is subjected to a downward air thrust. The valve cavity ( The inner peripheral wall of the valve cavity (11) is convexly formed with a pressure platform (15) located below the second outer core segment (202); a second outer cavity (11b) is formed between the inner peripheral wall of the valve cavity (11), the pressure platform (15) and the second outer core segment (202); an air inlet (23) connected to the first outer cavity (11a), a diversion hole (25) connected to the air inlet (23) and the second outer cavity (11b), and a decompression cavity (24) connected at one end to the air inlet (23) and extending to the bottom of the outer valve core (2) at the other end; when the second outer cavity (11b) is inflated, the outer valve core (2) is subjected to an upward air thrust; An external elastic member (3) is disposed between the valve cavity (11) and the external valve core (2) and is used to provide a downward elastic thrust to the external valve core (2); When the sum of the downward gas thrust exerted on the outer valve core (2) and the elastic thrust of the outer elastic member (3) is equal to the upward gas thrust exerted on the outer valve core (2), the outer valve core (2) reaches a stable state.

2. A pressure reducing valve structure according to claim 1, characterized in that: The outer peripheral wall of the outer valve core (2) is provided with an annular receiving groove (26), the outer elastic member (3) is a spring and is sleeved in the receiving groove (26), the upper end of the outer elastic member (3) is connected to the valve cavity (11) and the lower end abuts against the groove wall of the receiving groove (26), and the side wall of the valve body (1) is provided with an external air vent (14) connecting the receiving groove (26) and the outside of the valve body (1).

3. A pressure reducing valve structure according to claim 1, characterized in that: A gap is left between the upper portion of the outer peripheral wall of the first outer core segment (201) and the inner peripheral wall of the valve cavity (11); the lower portion of the outer peripheral wall of the first outer core segment (201) is raised to form an annular first external connecting platform (203); the outer peripheral wall of the first external connecting platform (203) is slidably fitted to the inner peripheral wall of the valve cavity (11), and the first external connecting platform (203) and the valve cavity (11) are sealed with each other; the first outer cavity (11a) is formed by the inner peripheral wall and upper side wall of the valve cavity (11), the upper portion of the first outer core segment (201), and the first external connecting platform (203).

4. A pressure reducing valve structure according to claim 1, characterized in that: The upper portion of the outer peripheral wall of the second outer core segment (202) is raised to form an annular second external connecting platform (204), and the outer peripheral wall of the second external connecting platform (204) is slidably fitted to the inner peripheral wall of the valve cavity (11). A gap is left between the lower portion of the outer peripheral wall of the second outer core segment (202) and the inner peripheral wall of the valve cavity (11), and the second outer cavity (11b) is formed by enclosing the inner peripheral wall of the valve cavity (11), the pressure platform (15), the lower portion of the second outer core segment (202), and the second external connecting platform (204).

5. A pressure reducing valve structure according to claim 2, 3 or 4, characterized in that: The air inlet hole (23) comprises a vertical hole section (232) and at least two transverse hole sections (231), wherein the transverse hole sections (231) are all connected to the first outer cavity (11a) from the upper peripheral wall of the first outer core section (201), and the transverse hole sections (231) are centrally symmetrically distributed relative to the vertical hole sections (232). The upper end of the vertical hole section (232) is connected to all the transverse hole sections (231), and the lower end is connected to the decompression cavity (24).

6. A pressure reducing valve structure according to claim 5, characterized in that: There are at least two diversion holes (25) distributed in a centrally symmetrical manner relative to the vertical hole section (232); the upper ends of the diversion holes (25) are connected to the vertical hole section (232) and the lower ends are connected from the outer peripheral wall of the second outer core section (202) to the second outer cavity (11b).

7. A pressure reducing valve structure according to claim 5, characterized in that: The bottom of the outer valve core (2) is sealed with a cover (22), and the cover (22) is provided with a gas nozzle (221) arranged vertically, the upper end of the gas nozzle (221) is connected to the decompression chamber (24) and the lower end is staggered relative to the gas outlet (13).

8. A pressure reducing valve structure according to claim 7, characterized in that: It also includes an inner valve core (4) and an inner elastic member (5), wherein the inner valve core (4) is vertically arranged inside the decompression chamber (24) and can move in the up and down directions, and the top of the inner valve core (4) is provided with an inner plug (41) for matching the vertical hole section (232), and a first inner cavity (241a) is formed between the upper part of the inner valve core (4) and the inner peripheral wall and the upper side wall of the decompression chamber (24), and the vertical hole section (232) is connected to the first inner cavity (241a). When the first inner cavity (241a) is inflated, the inner valve core (4) is subjected to a downward gas thrust; the lower part of the inner valve core (4) and the decompression chamber (24) are connected to the inner peripheral wall and the upper side wall of the decompression chamber (24). A second inner cavity (242a) is formed between the inner peripheral wall of the valve (24) and the cover (22); an inner air hole (42) connected to the first inner cavity (241a) and an air guide hole (43) connecting the inner air hole (42) and the second inner cavity (242a) are provided in the inner valve core (4); the inner diameter of the air nozzle (221) is smaller than the inner diameter of the second inner cavity (242a); when the second inner cavity (242a) is inflated, the inner valve core (4) is subjected to an upward air thrust; the inner elastic member (5) is arranged between the decompression chamber (24) and the inner valve core (4) and is used to provide a downward elastic thrust to the inner valve core (4); When the sum of the downward gas thrust exerted on the inner valve core (4) and the elastic thrust of the inner elastic member (5) is equal to the upward gas thrust exerted on the inner valve core (4), the inner valve core (4) reaches a stable state.

9. A pressure reducing valve structure according to claim 8, characterized in that: The upper portion of the inner peripheral wall of the decompression chamber (24) is provided with a first chamber section (241) with a reduced inner diameter. The upper portion of the outer peripheral wall of the inner valve core (4) is raised to form an annular first internal connecting platform (401). The first internal connecting platform (401) is slidably fitted to the first chamber section (241), and the first internal connecting platform (401) and the first chamber section (241) are sealed with each other. The first inner chamber (241a) is formed by enclosing the upper side wall and inner peripheral wall of the decompression chamber (24), the upper portion of the inner valve core (4), and the first internal connecting platform (401).

10. A pressure reducing valve structure according to claim 9, characterized in that: A second cavity section (242) with an enlarged inner diameter is provided at the lower portion of the inner peripheral wall of the decompression cavity (24); a lower portion of the outer peripheral wall of the inner valve core (4) is raised to form an annular second internal connecting platform (402); the second internal connecting platform (402) is slidably fitted to the second cavity section (242); and the second internal connecting platform (402) and the second cavity section (242) are sealed with each other; the second inner cavity (242a) is formed by enclosing the inner peripheral wall of the decompression cavity (24), the lower portion of the inner valve core (4), the second internal connecting platform (402) and the cover (22).

11. A pressure reducing valve structure according to claim 10, characterized in that: The decompression chamber (24) further includes a third chamber section (243) located between the first chamber section (241) and the second chamber section (242), the inner diameter of the third chamber section (243) being between the inner diameter of the first chamber section (241) and the second chamber section (242), the inner elastic member (5) being a spring and being sleeved on the outer side of the inner valve core (4) and located in the third chamber section (243), the upper end of the inner elastic member (5) being connected to the third chamber section (243) and the lower end being in contact with the upper side of the second inner connecting platform (402), and the inner peripheral wall of the second chamber section (242) being provided with an inner air vent (27) which passes through the accommodating groove (26).

12. The pressure reducing valve structure according to claim 1, characterized in that: The air inlet (12) vertically penetrates to the top of the valve cavity (11) and the aperture gradually increases from top to bottom. The outer plug (21) is a conical structure with a diameter gradually increasing from top to bottom. The air outlet (13) horizontally penetrates to the inner peripheral wall of the bottom of the valve cavity (11).

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