High-pressure reducing valve

Abstract

The invention belongs to the technical field of valves, and particularly discloses a high-pressure reducing valve which comprises a front-end pressure reducing part and a rear-end pressure reducing part, during pressure reduction, pressure reducing fluid can selectively and sequentially flow through all pressure reducing grooves and pressure reducing channels in the front-end pressure reducing part or sequentially flow through part of the pressure reducing grooves and the pressure reducing channels for primary pressure reduction; the pressure reduction path of high-pressure fluid circulation is changed to adapt to the high-pressure fluid in a larger range, after the purpose of primary pressure reduction is achieved through the pressure reduction groove, the pressure of the high-pressure fluid is reduced to be within the preset range, then the rear-end pressure reduction part conducts secondary pressure reduction on the fluid with the pressure within the preset range again, the gas outlet pressure is accurately regulated and controlled, and it is guaranteed that the output pressure is stable; the pressure of fluid at the outlet of the pressure reducing valve is always kept within a reasonable range, the conditions that low-pressure gas cannot circulate and a gas supply system cannot supply gas are avoided, the high-pressure pressure reducing valve can adapt to a large pressure adjusting range, output pressure is stable and high in precision after pressure reduction, and noise is low in the whole pressure reducing process.

Description

Technical Field

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

[0002] The pressure reducing valve is a commonly used pressure regulating valve in industry. It mainly produces different degrees of throttling and pressure reducing effects by adjusting the valve core opening to reduce the outlet pressure to the target pressure. Compared with other pressure reducing devices, the pressure reducing valve has the characteristics of achieving high pressure difference pressure reduction and maintaining stable outlet pressure.

[0003] At present, the traditional high-pressure pressure reducing valve generally controls the outlet pressure through the pressure feedback chamber area and the spring. Therefore, when the preload of the spring is large and the inlet of the pressure reducing valve is low-pressure gas, the low-pressure gas cannot be effectively reduced in pressure, and even the low-pressure gas cannot flow. The gas supply system cannot supply gas, the valve locking pressure is high, and the valve pressure adjustment range is small. Especially when the pressure reducing valve is used for the pressure reducing condition of high-pressure hydrogen, due to the strong corrosiveness of high-pressure hydrogen and the large temperature change state during high-pressure pressure reduction, the flow condition of the pressure reducing process is bad, and the spring is in dynamic balance. If it is in this state for a long time, the fatigue life of the spring will be low, and the pressure reducing function will be damaged, which may cause hydrogen erosion, hydrogen embrittlement, fatigue damage, etc. in the high-pressure hydrogen pressure reducing valve, causing vehicle accidents. In addition, due to the fast flow rate and low temperature of the fluid at the pressure reducing position of the valve core, the valve core is severely affected by low temperature and wear, and it is easy to cause the dynamic seal of the valve core to be unreliable after long-term work, which will cause damage, vibration, noise and other problems of the pressure reducing valve.

[0004] Therefore, a high-pressure pressure reducing valve is urgently needed to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a high-pressure pressure reducing valve, which reduces pressure by means of multi-stage pressure reduction, has good adaptability to the fluid pressure at the inlet, has a large valve pressure adjustment range, and has stable output pressure after pressure reduction, high precision, and low noise during the entire pressure reduction process.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] The present invention provides a high-pressure pressure reducing valve, which comprises:

[0008] The front-end pressure reducing part comprises n-stage pressure reducing grooves, wherein the n-stage pressure reducing grooves are connected to each other through n-stage pressure reducing channels, the first-stage pressure reducing groove is connected to the pressure reducing valve inlet, and each-stage pressure reducing channel is connected to the pressure reducing valve inlet, and n-stage valve cores are provided in each-stage pressure reducing channel. When the n-stage valve cores are subjected to the pressure of the n-stage elastic pressure applying structures, the corresponding pressure reducing channels can be sealed, and the pressures on the n-stage valve cores are reduced sequentially;

[0009] The rear-end pressure reducing part comprises a rear-end pressure reducing inlet, a rear-end pressure reducing channel and a pressure reducing valve outlet which are connected in sequence, wherein the rear-end pressure reducing inlet is connected with the outlet of the pressure reducing channel of the last stage, and a pressure stabilizing valve core is arranged in the rear-end pressure reducing channel;

[0010] The decompression fluid selectively flows through all the decompression grooves and the decompression channels or flows through part of the decompression grooves and the decompression channels in sequence according to its own pressure to perform a primary decompression, and then flows into the rear end decompression channel to perform a secondary decompression.

[0011] As an optional technical solution, the decompression groove includes a primary decompression groove, a secondary decompression groove and a tertiary decompression groove, and the decompression channel includes a primary decompression channel, a secondary decompression channel and a tertiary decompression channel;

[0012] The two ends of the first-level pressure-reducing groove are respectively communicated with the pressure-reducing valve inlet and the first-level pressure-reducing channel, the two ends of the second-level pressure-reducing groove are respectively communicated with the first-level pressure-reducing channel and the second-level pressure-reducing channel, the two ends of the third-level pressure-reducing groove are respectively communicated with the second-level pressure-reducing channel and the third-level pressure-reducing channel, the third-level pressure-reducing channel outlet is communicated with the rear-end pressure-reducing inlet, and the first-level pressure-reducing channel, the second-level pressure-reducing channel and the third-level pressure-reducing channel are communicated with the pressure-reducing valve inlet.

[0013] As an optional technical solution, the valve core includes a primary valve core, a secondary valve core and a tertiary valve core, and the primary pressure relief channel, the secondary pressure relief channel and the tertiary pressure relief channel are respectively provided with a primary sealing surface, a secondary sealing surface and a tertiary sealing surface, and the primary valve core, the secondary valve core and the tertiary valve core can be respectively pressed against the primary sealing surface, the secondary sealing surface and the tertiary sealing surface;

[0014] The primary sealing surface is arranged upstream of the primary pressure relief groove connecting to the primary pressure relief channel, the secondary sealing surface is arranged upstream of the secondary pressure relief groove connecting to the secondary pressure relief channel, and the tertiary sealing surface is arranged upstream of the tertiary pressure relief groove connecting to the tertiary pressure relief channel.

[0015] As an optional technical solution, the primary sealing surface, the secondary sealing surface and the tertiary sealing surface are all configured as sealing inclined surfaces, and the valve core covers of the primary valve core, the secondary valve core and the tertiary valve core are all configured as trapezoidal shapes, and the two inclined surfaces of the trapezoid can be sealed and connected to the sealing inclined surfaces.

[0016] As an optional technical solution, the elastic pressure structure includes a primary elastic pressure structure, a secondary elastic pressure structure and a tertiary elastic pressure structure. The primary elastic pressure structure applies a first pressure to the primary valve core, the secondary elastic pressure structure applies a second pressure to the secondary valve core, and the tertiary elastic pressure structure applies a third pressure to the tertiary valve core. The first pressure, the second pressure and the third pressure decrease sequentially.

[0017] As an optional technical solution, the first-level elastic pressure structure is set as a first spring, the second-level elastic pressure structure is set as a second spring, and the third-level elastic pressure structure is set as a third spring, and the spring K values ​​of the first spring, the second spring and the third spring decrease successively.

[0018] As an optional technical solution, the first-level pressure reducing channel includes a first-level spring hole, the first spring is arranged in the first-level spring hole, and the two ends of the first spring are respectively abutted against the first-level valve core and the bottom wall of the first-level spring hole; the second-level pressure reducing channel includes a second-level spring hole, the second spring is arranged in the second-level spring hole, and the two ends of the second spring are respectively abutted against the second-level valve core and the bottom wall of the second-level spring hole; the third-level pressure reducing channel includes a third-level spring hole, the third spring is arranged in the third-level spring hole, and the two ends of the third spring are respectively abutted against the third-level valve core and the bottom wall of the third-level spring hole.

[0019] As an optional technical solution, the front end pressure relief portion includes a front end pressure relief shell, the pressure relief valve inlet is arranged in the front end pressure relief shell, the first level pressure relief channel, the second level pressure relief channel and the third level pressure relief channel are arranged in the front end pressure relief shell and are evenly distributed along the circumference of the front end pressure relief shell, and the first level pressure relief groove is arranged on the central axis of the front end pressure relief shell.

[0020] As an optional technical solution, the rear end decompression part includes a rear end decompression shell, the front end decompression shell and the rear end decompression shell are connected by a connector, and the decompression valve outlet is arranged at the rear end decompression shell.

[0021] As an optional technical solution, the rear end pressure reducing channel is arranged in the rear end pressure reducing shell, a sealing body is provided at the rear end pressure reducing inlet, the pressure stabilizing valve core is connected to the rear end pressure reducing spring, and the rear end pressure reducing spring applies pressure to the pressure stabilizing valve core toward the sealing body.

[0022] The beneficial effects of the present invention are:

[0023] The present invention provides a high-pressure pressure reducing valve, which includes a front-end pressure reducing part and a rear-end pressure reducing part. The pressure reducing fluid can be reduced in pressure once in the front-end pressure reducing part, and then reduced in pressure twice through the rear-end pressure reducing channel. During pressure reduction, the pressure reducing fluid can selectively flow through all the pressure reducing grooves and pressure reducing channels in the front-end pressure reducing part according to its own pressure, or flow through part of the pressure reducing grooves and pressure reducing channels in sequence to reduce pressure once, and adapt to a larger range of high-pressure fluids by changing the pressure reducing path of the high-pressure fluid circulation. After the pressure reducing purpose is achieved once through the pressure reducing groove, the high-pressure fluid is reduced in pressure to a preset range, and then the rear-end pressure reducing part again reduces the pressure of the fluid within the preset range for a second time, and accurately controls the outlet pressure, thereby ensuring that the output pressure of the fluid flowing out of the pressure reducing valve outlet is stable. Regardless of whether the fluid pressure at the inlet of the pressure reducing valve is high or low, the fluid pressure at the outlet of the pressure reducing valve is always kept within a reasonable range, avoiding the situation where the low-pressure gas cannot circulate and the air supply system cannot supply air. The pressure regulating range that the high-pressure pressure reducing valve can adapt to is large, and the output pressure after pressure reduction is stable, the precision is high, and the noise of the entire pressure reducing process is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0025] Figure 1 is a structural schematic diagram of a high-pressure pressure reducing valve provided in an embodiment of the present invention;

[0026] Figure 2 is a schematic structural diagram of a front end pressure reducing portion provided in an embodiment of the present invention;

[0027] Figure 3 is a schematic structural diagram of a front end pressure relief portion provided in an embodiment of the present invention from another perspective;

[0028] Figure 4 yes Figure 1 Sectional view of the AA section;

[0029] Figure 5 yes Figure 1 Sectional view of the middle BB section;

[0030] Figure 6 It is a schematic diagram of the structure of a primary valve core provided in an embodiment of the present invention.

[0031] In the figure:

[0032] 100, front pressure reducing part; 101, pressure reducing valve inlet; 102, front pressure reducing shell; 110, primary pressure reducing channel; 111, primary pressure reducing groove; 112, primary valve core; 1121, valve core cover; 1122, inclined surface; 113, first spring; 1131, primary spring hole; 114, sealing inclined surface; 120, secondary pressure reducing channel; 121, secondary pressure reducing groove; 122, secondary spring hole; 130, tertiary pressure reducing channel; 131, tertiary pressure reducing groove; 132, tertiary spring hole; 133, tertiary pressure reducing channel outlet;

[0033] 200, rear pressure reducing part; 201, pressure reducing valve outlet; 202, rear pressure reducing shell; 210, pressure stabilizing valve core; 220, rear pressure reducing spring; 221, spring cover; 230, sealing body;

[0034] 300, connector; 310, inlet end; 320, outlet end; 330, guide surface. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0039] like Figure 1-Figure 5 As shown, this embodiment provides a high-pressure pressure reducing valve, which includes a front-end pressure reducing portion 100 and a rear-end pressure reducing portion 200. The pressure reducing fluid can be reduced in pressure once in the front-end pressure reducing portion 100 and then reduced in pressure twice through the rear-end pressure reducing channel.

[0040] Specifically, the front-end pressure reducing part 100 includes n-stage pressure reducing grooves, which are interconnected through n-stage pressure reducing channels, and the first-stage pressure reducing groove is connected to the pressure reducing valve inlet 101, and each stage of the pressure reducing channel is also connected to the pressure reducing valve inlet 101, and each stage of the pressure reducing channel is correspondingly provided with n-stage valve cores, and the n-stage valve cores can seal the corresponding pressure reducing channels when subjected to the pressure of the n-stage elastic pressure applying structures, and the pressures subjected to the n-stage valve cores are reduced successively; thereby, the pressure reducing fluid selectively flows through all the pressure reducing grooves and pressure reducing channels or flows through part of the pressure reducing grooves and pressure reducing channels in sequence according to its own pressure to perform a primary pressure reducing, wherein the pressure reducing groove is a slender path, thereby achieving the throttling and pressure reducing functions, and achieving the purpose of primary pressure reducing through the pressure reducing groove; the rear-end pressure reducing channel includes a rear-end pressure reducing inlet, a rear-end pressure reducing channel and a pressure reducing valve outlet 201 which are connected in sequence, and the rear-end pressure reducing inlet is connected to the outlet of the final stage pressure reducing channel, and a pressure stabilizing valve core 210 is provided in the rear-end pressure reducing channel, and the pressure reducing fluid after the primary pressure reducing from the front-end pressure reducing part 100 can continue to flow into the rear-end pressure reducing channel for a secondary pressure reducing.

[0041] It should be noted that the inlet of the front-end pressure reducing part 100 can adapt to high-pressure fluid in a larger pressure range, and reduce the pressure of the high-pressure fluid to within a preset range, and then the rear-end pressure reducing part 200 again reduces the pressure of the fluid within the preset range for a second time, and accurately regulates the outlet pressure, thereby ensuring that the output pressure of the fluid flowing out of the pressure reducing valve outlet 201 is stable. Regardless of whether the fluid pressure at the pressure reducing valve inlet 101 is high or low, the fluid pressure at the pressure reducing valve outlet 201 is always maintained within a reasonable range, avoiding the situation where low-pressure gas cannot circulate, the valve locking pressure is high, and the gas supply system cannot supply gas. Therefore, the high-pressure pressure reducing valve in this embodiment can adapt to a larger pressure adjustment range, and the output pressure after pressure reduction is stable and accurate, and the entire pressure reduction process has low noise.

[0042] As an optional solution, this embodiment takes the three-level decompression groove and the three-level decompression channel as an example for explanation. Figure 4 The pressure reducing grooves include a primary pressure reducing groove 111, a secondary pressure reducing groove 121 and a tertiary pressure reducing groove 131, and the pressure reducing channels include a primary pressure reducing channel 110, a secondary pressure reducing channel 120 and a tertiary pressure reducing channel 130; the two ends of the primary pressure reducing groove 111 are respectively connected to the pressure reducing valve inlet 101 and the primary pressure reducing channel 110, the two ends of the secondary pressure reducing groove 121 are respectively connected to the primary pressure reducing channel 110 and the secondary pressure reducing channel 120, the two ends of the tertiary pressure reducing groove 131 are respectively connected to the secondary pressure reducing channel 120 and the tertiary pressure reducing channel 130, the tertiary pressure reducing channel outlet 133 is connected to the rear-end pressure reducing inlet, and the upstream ports of the primary pressure reducing channel 110, the secondary pressure reducing channel 120 and the tertiary pressure reducing channel 130 are all connected to the pressure reducing valve inlet 101. When the fluid pressure at the pressure reducing valve inlet 101 is in different ranges, different pressure reducing paths are selected to flow through.

[0043] Correspondingly, the valve core in this embodiment includes a primary valve core 112, a secondary valve core and a tertiary valve core, and the primary pressure relief channel 110, the secondary pressure relief channel 120 and the tertiary pressure relief channel 130 are provided with a primary sealing surface, a secondary sealing surface and a tertiary sealing surface respectively. The primary valve core 112, the secondary valve core and the tertiary valve core can respectively press against the primary sealing surface, the secondary sealing surface and the tertiary sealing surface; and the primary sealing surface is arranged upstream of the primary pressure relief groove 111 connecting to the primary pressure relief channel 110, the secondary sealing surface is arranged upstream of the secondary pressure relief groove 121 connecting to the secondary pressure relief channel 120, and the tertiary sealing surface is arranged upstream of the tertiary pressure relief groove 131 connecting to the tertiary pressure relief channel 130. See Figure 2 , Figure 3 and Figure 6 The primary sealing surface, the secondary sealing surface and the tertiary sealing surface are all set as the sealing bevel 114. The structures of the primary valve core 112, the secondary valve core and the tertiary valve core are the same. The valve core covers 1121 of the primary valve core 112, the secondary valve core and the tertiary valve core are all set as trapezoids, and the upper bottom length of the trapezoid is much smaller than the lower bottom length, so that the force of the corresponding valve core mainly comes from the entrance of the corresponding pressure reducing channel. Furthermore, the sealing bevel 114 and the trapezoidal bevel 1122 have the same inclination angle, so that the two trapezoidal bevels 1122 can be completely fitted with the sealing bevel 114, so that the corresponding valve core cover 1121 is sealed and connected to the sealing bevel 114.

[0044] Furthermore, the elastic pressure structure includes a first-level elastic pressure structure, a second-level elastic pressure structure and a third-level elastic pressure structure. The first-level elastic pressure structure can apply a first pressure to the first-level valve core 112, the second-level elastic pressure structure can apply a second pressure to the second-level valve core, and the third-level elastic pressure structure can apply a third pressure to the third-level valve core. The first pressure, the second pressure and the third pressure decrease successively.

[0045] Alternatively, see Figure 1 and Figure 5The first-stage elastic pressure structure can be set as the first spring 113, the second-stage elastic pressure structure can be set as the second spring, and the third-stage elastic pressure structure can be set as the third spring. The spring K values ​​of the first spring 113, the second spring and the third spring decrease in sequence. The first-stage decompression channel 110 includes a first-stage spring hole 1131, the first spring 113 is arranged in the first-stage spring hole 1131, and the two ends of the first spring 113 are respectively abutted against the first-stage valve core 112 and the bottom wall of the first-stage spring hole 1131; the second-stage decompression channel 120 includes a second-stage spring hole 122, the second spring is arranged in the second-stage spring hole 122, and the two ends of the second spring are respectively abutted against the second-stage valve core and the bottom wall of the second-stage spring hole 122; the third-stage decompression channel 130 includes a third-stage spring hole 132, the third spring is arranged in the third-stage spring hole 132, and the two ends of the third spring are respectively abutted against the third-stage valve core and the bottom wall of the third-stage spring hole 132. Therefore, different elastic forces are applied to the primary valve core 112 , the secondary valve core and the tertiary valve core by the first spring 113 , the second spring and the third spring, thereby selectively closing the primary pressure relief channel 110 and / or the secondary pressure relief channel 120 .

[0046] For example, this embodiment takes the decompression fluid as gas as an example for explanation, and the pressure at the pressure reducing valve inlet 101 is divided into four pressure ranges: high pressure, high pressure, medium pressure and low pressure. For example:

[0047] When the gas pressure is in the high pressure range (70MPa-55MPa), at this time, due to the high gas pressure at the pressure reducing valve inlet 101, the maximum elastic force that the first spring 113, the second spring and the third spring can provide for the corresponding valve core is still insufficient to resist the pressure, and the first-stage valve core 112, the second-stage valve core and the third-stage valve core cannot be separated from the corresponding sealing inclined surface 114, so that the airflow can only flow through the first-stage pressure reducing groove 111, the second-stage pressure reducing groove 121, the third-stage pressure reducing groove 131 and the third-stage pressure reducing channel 130 in sequence, and then flow out of the third-stage pressure reducing channel outlet 133, and then flow out of the front end pressure reducing part 100; in this process, the pressure reducing path passed by the airflow is the longest, and after three stages of pressure reducing process, the gas pressure drops the most;

[0048] When the gas pressure is in the high and medium pressure range (55MPa-35MPa), at this time, since the gas pressure at the pressure reducing valve inlet 101 is still relatively high, the maximum elastic force that the second spring and the third spring can provide for the corresponding valve core is still insufficient to resist the pressure, and the secondary valve core and the tertiary valve core cannot be separated from the corresponding sealing inclined surface 114, but the first spring 113 can provide a sufficiently large elastic force to resist the pressure, the primary valve core 112 is separated from the primary sealing surface and is in a dynamic equilibrium state, the primary pressure reducing channel 110 is connected, and the airflow flows through the primary pressure reducing channel 110, the secondary pressure reducing groove 121, the tertiary pressure reducing groove 131 and the tertiary pressure reducing channel 130 in sequence, and then flows out from the tertiary pressure reducing channel outlet 133, and then flows out of the front end pressure reducing part 100; in this process, the primary pressure reducing groove 111 is skipped, the pressure reducing path of the airflow is shortened, and it goes through two stages of pressure reducing process;

[0049] When the gas pressure is in the medium pressure range (35MPa-10MPa), at this time, due to the medium gas pressure at the pressure reducing valve inlet 101, the maximum elastic force that the third spring can provide for the three-stage valve core is still insufficient to resist the pressure, and the three-stage valve core still cannot separate from the corresponding sealing inclined surface 114, but the first spring 113 and the second spring can provide a sufficiently large elastic force for the first-stage valve core 112 and the second-stage valve core to resist the pressure, and the first-stage valve core 112 and the second-stage valve core are separated from the first-stage sealing surface and the second-stage sealing surface respectively and are in a dynamic equilibrium state, and the first-stage pressure reducing channel 110 and the second-stage pressure reducing channel 120 are connected, and the airflow flows through the second-stage pressure reducing channel 120, the third-stage pressure reducing groove 131 and the third-stage pressure reducing channel 130 in sequence, and then flows out from the third-stage pressure reducing channel outlet 133, and then flows out of the front end pressure reducing part 100; in this process, the first-stage pressure reducing groove 111 and the second-stage pressure reducing groove 121 are skipped, and the pressure reducing path of the airflow continues to shorten, and only a pressure reducing process is passed;

[0050] When the gas pressure is in the low pressure range (10MPa-2MPa), at this time, due to the low gas pressure at the pressure reducing valve inlet 101, the first spring 113, the second spring, and the third spring can provide sufficient elastic force for the primary valve core 112, the secondary valve core, and the tertiary valve core to resist the pressure, and the primary valve core 112, the secondary valve core, and the tertiary valve core are separated from the primary sealing surface, the secondary sealing surface, and the tertiary sealing surface respectively and are in a dynamic equilibrium state, and the primary pressure reducing channel 110, the secondary pressure reducing channel 120, and the tertiary pressure reducing channel 130 are all connected, and the airflow flows through the tertiary pressure reducing channel 130 and flows out from the tertiary pressure reducing channel outlet 133, and then flows out of the front end pressure reducing part 100; in this process, the primary pressure reducing groove 111, the secondary pressure reducing groove 121, and the tertiary pressure reducing groove 131 are skipped, and the airflow directly enters the rear end pressure reducing part 200 without undergoing the pressure reducing process;

[0051] Thereby, it is ensured that the air pressure at the entrance of the rear-end pressure reducing part 200 is maintained in the low-pressure range (10MPa-2MPa), that is, the aforementioned preset range, and then the rear-end pressure reducing part 200 performs secondary pressure stabilization and pressure reduction, which is conducive to ensuring the pressure stability of the pressure reducing valve outlet 201. And in the above-mentioned adjustment process, different pressure reducing paths can be selected for pressure reduction without human intervention, the cost of modification is low, and the high-pressure pressure reducing valve is also in a dynamic adjustment process, which is not easy to cause spring fatigue and has a long service life. In addition, because the airflow flow path of the front-end pressure reducing part 100 is longer, the influence of the low temperature of the fluid on the valve core is relatively reduced, and the vibration of the valve is also improved.

[0052] Of course, this embodiment is only described by taking the example of setting the pressure reducing grooves to three levels and the pressure reducing channels to three levels. In other embodiments, more levels of pressure reducing grooves and more levels of pressure reducing channels can also be set to further improve the accuracy of pressure regulation, which is not limited in this embodiment.

[0053] Continue to see Figure 1 and Figure 4 The front-end decompression part 100 includes a front-end decompression shell 102, a decompression valve inlet 101 is arranged at one end of the front-end decompression shell 102, the above-mentioned primary decompression channel 110, secondary decompression channel 120 and tertiary decompression channel 130 are arranged in the front-end decompression shell 102 and are evenly distributed along the circumference of the front-end decompression shell 102, and the primary decompression groove 111 is arranged on the central axis of the front-end decompression shell 102. The rear-end decompression part 200 includes a rear-end decompression shell 202, the other end of the front-end decompression shell 102 and the rear-end decompression shell 202 are connected by a connector 300, and the decompression valve outlet 201 is arranged at the rear-end decompression shell 202.

[0054] Specifically, see Figure 3 The connector 300 includes an inlet end 310, an outlet end 320 and a connecting channel, wherein the two ends of the connecting channel are connected to the inlet end 310 and the outlet end 320, wherein the inlet end 310 is connected to the outlet 133 of the three-stage decompression channel, the outlet end 320 is connected to the rear-end decompression inlet, and the rear-end decompression inlet is connected to the rear-end decompression channel, so that the fluid after the first decompression can smoothly enter the rear-end decompression channel of the rear-end decompression part 200 from the outlet 133 of the three-stage decompression channel of the front-end decompression part 100 for secondary decompression. Optionally, in some embodiments, the connecting channel can also be set as a variable diameter channel, for example, the flow area of ​​the inlet end 310 is larger than the flow area of ​​the outlet end 320, so as to play a certain convergence role and ensure that the fluid at the rear-end decompression inlet is relatively concentrated. Further, a guide surface 330 can be provided in the variable diameter channel, and the guide surface 330 can play a guiding role for the fluid, so as to achieve better convergence.

[0055] Of course, in other embodiments, the connector 300 may also use other connector structures in the prior art, as long as it can ensure that the third-level decompression channel outlet 133 and the rear-end decompression channel are connected. The specific form is not limited in this implementation and is only used as an example here.

[0056] As an alternative, continue to see Figure 1 In this embodiment, the rear-end pressure reducing passage is arranged in the rear-end pressure reducing housing 202, a sealing body 230 is arranged at the rear-end pressure reducing inlet, the pressure stabilizing valve core 210 is connected with the rear-end pressure reducing spring 220, and the rear-end pressure reducing spring 220 can apply pressure to the pressure stabilizing valve core 210 toward the sealing body 230, and the opening of the rear-end pressure reducing passage is adjusted by the cooperation of the pressure stabilizing valve core 210 and the sealing body 230. Furthermore, a spring cover plate 221 is also arranged at one end of the rear-end pressure reducing spring 220 close to the sealing body 230, one end of the spring is embedded in the side of the spring cover plate 221 away from the sealing body 230, and the other side of the spring cover plate 221 can abut against the sealing body 230. Preferably, a sealing ring can also be arranged between the sealing body 230 and the rear-end pressure reducing housing 202 to improve the sealing performance.

[0057] The decompression structure of the rear end decompression part 200 in this embodiment is only an example. In other embodiments, it can also be set to other decompression structures with pressure stabilization and decompression functions, which will not be described one by one here.

[0058] Obviously, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

[0059] Note that in the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A high pressure reducing valve, characterized in that: include: The front end pressure reducing portion (100) comprises n-stage pressure reducing grooves, wherein the n-stage pressure reducing grooves are interconnected via n-stage pressure reducing channels, wherein the first-stage pressure reducing groove is connected to the pressure reducing valve inlet (101), and each stage pressure reducing channel is connected to the pressure reducing valve inlet (101), wherein n-stage valve cores are correspondingly arranged in each stage pressure reducing channel, and when the n-stage valve cores are subjected to pressure from the n-stage elastic pressure applying structures, the pressures applied to the n-stage valve cores are reduced sequentially; A rear-end pressure reducing portion (200) comprises a rear-end pressure reducing inlet, a rear-end pressure reducing channel and a pressure reducing valve outlet (201) which are connected in sequence, wherein the rear-end pressure reducing inlet is connected to the outlet of the pressure reducing channel at the last stage, and a pressure stabilizing valve core (210) is provided in the rear-end pressure reducing channel; The decompression fluid selectively flows through all the decompression grooves and the decompression channels or flows through part of the decompression grooves and the decompression channels in sequence according to its own pressure to perform a primary decompression, and then flows into the rear end decompression channel to perform a secondary decompression.

2. The high pressure reducing valve according to claim 1, characterized in that: The decompression groove comprises a primary decompression groove (111), a secondary decompression groove (121) and a tertiary decompression groove (131); and the decompression channel comprises a primary decompression channel (110), a secondary decompression channel (120) and a tertiary decompression channel (130); The two ends of the first pressure reducing groove (111) are respectively in communication with the pressure reducing valve inlet (101) and the first pressure reducing channel (110); the two ends of the second pressure reducing groove (121) are respectively in communication with the first pressure reducing channel (110) and the second pressure reducing channel (120); the two ends of the third pressure reducing groove (131) are respectively in communication with the second pressure reducing channel (120) and the third pressure reducing channel (130); the third pressure reducing channel outlet (133) is in communication with the rear end pressure reducing inlet; the first pressure reducing channel (110), the second pressure reducing channel (120) and the third pressure reducing channel (130) are in communication with the pressure reducing valve inlet (101).

3. The high pressure reducing valve according to claim 2, characterized in that: The valve core comprises a primary valve core (112), a secondary valve core and a tertiary valve core; the primary pressure relief channel (110), the secondary pressure relief channel (120) and the tertiary pressure relief channel (130) are provided with a primary sealing surface, a secondary sealing surface and a tertiary sealing surface respectively; the primary valve core (112), the secondary valve core and the tertiary valve core can be pressed against the primary sealing surface, the secondary sealing surface and the tertiary sealing surface respectively; The primary sealing surface is arranged upstream of the primary pressure reducing groove (111) connecting to the primary pressure reducing channel (110), the secondary sealing surface is arranged upstream of the secondary pressure reducing groove (121) connecting to the secondary pressure reducing channel (120), and the tertiary sealing surface is arranged upstream of the tertiary pressure reducing groove (131) connecting to the tertiary pressure reducing channel (130).

4. The high pressure reducing valve according to claim 3, characterized in that: The primary sealing surface, the secondary sealing surface and the tertiary sealing surface are all configured as sealing inclined surfaces (114); the valve core covers (1121) of the primary valve core (112), the secondary valve core and the tertiary valve core are all configured as trapezoidal; and the two inclined surfaces (1122) of the trapezoid can be sealingly connected to the sealing inclined surfaces (114).

5. The high pressure reducing valve according to claim 3, characterized in that: The elastic pressure structure comprises a primary elastic pressure structure, a secondary elastic pressure structure and a tertiary elastic pressure structure, wherein the primary elastic pressure structure applies a first pressure to the primary valve core (112), the secondary elastic pressure structure applies a second pressure to the secondary valve core, and the tertiary elastic pressure structure applies a third pressure to the tertiary valve core, wherein the first pressure, the second pressure and the third pressure decrease in sequence.

6. The high pressure reducing valve according to claim 5, characterized in that: The first-stage elastic pressure structure is set as a first spring (113), the second-stage elastic pressure structure is set as a second spring, and the third-stage elastic pressure structure is set as a third spring. The spring K values ​​of the first spring (113), the second spring and the third spring decrease in sequence.

7. The high pressure reducing valve according to claim 6, characterized in that: The first-stage decompression channel (110) comprises a first-stage spring hole (1131), the first spring (113) is arranged in the first-stage spring hole (1131), and the two ends of the first spring (113) are respectively in contact with the first-stage valve core (112) and the bottom wall of the first-stage spring hole (1131); the second-stage decompression channel (120) comprises a second-stage spring hole (122), the second spring is arranged in the second-stage spring hole (122), and the two ends of the second spring are respectively in contact with the second-stage valve core and the bottom wall of the second-stage spring hole (122); the third-stage decompression channel (130) comprises a third-stage spring hole (132), the third spring is arranged in the third-stage spring hole (132), and the two ends of the third spring are respectively in contact with the third-stage valve core and the bottom wall of the third-stage spring hole (132).

8. The high pressure reducing valve according to any one of claims 2 to 7, characterized in that: The front end pressure reducing portion (100) comprises a front end pressure reducing shell (102), the pressure reducing valve inlet (101) is arranged in the front end pressure reducing shell (102), the primary pressure reducing channel (110), the secondary pressure reducing channel (120) and the tertiary pressure reducing channel (130) are arranged in the front end pressure reducing shell (102) and are evenly distributed along the circumference of the front end pressure reducing shell (102), and the primary pressure reducing groove (111) is arranged on the central axis of the front end pressure reducing shell (102).

9. The high pressure reducing valve according to claim 8, characterized in that: The rear end decompression part (200) comprises a rear end decompression shell (202); the front end decompression shell (102) and the rear end decompression shell (202) are connected via a connector (300); and the decompression valve outlet (201) is arranged on the rear end decompression shell (202).

10. The high pressure reducing valve according to claim 9, characterized in that: The rear end pressure reducing passage is arranged in the rear end pressure reducing shell (202), a sealing body (230) is provided at the rear end pressure reducing inlet, the pressure stabilizing valve core (210) is connected to the rear end pressure reducing spring (220), and the rear end pressure reducing spring (220) applies pressure to the pressure stabilizing valve core (210) toward the sealing body (230).

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