Pressure reducing valve element based on 3D printing and high-pressure hydrogen regulating valve with pressure reducing valve element

Abstract

The invention discloses a pressure reducing valve element based on 3D printing and a high-pressure hydrogen regulating valve with the pressure reducing valve element. The pressure reducing valve element comprises a valve element inner shell, a valve element outer shell and a plurality of fluid labyrinth type valve element bodies which are connected together, and the multiple fluid labyrinth type valve element bodies are located between the valve element inner shell and the valve element outer shell and are sequentially arranged from inside to outside; a volume cavity and a first ring cavity which are communicated with each other are formed between the fluid labyrinth type valve core body and the valve core shell; each fluid labyrinth type valve core body is communicated with the volume cavity; the valve element inner shell is provided with a gas inlet. The valve element shell is provided with a gas outlet communicating with the first annular cavity. The multiple fluid labyrinth type valve element bodies communicate with the valve element inner shell through multiple flow channels which are arranged up and down correspondingly. According to the invention, the complex path and the stability of fluid flow are greatly enhanced, a dual pressure reduction mechanism of throttling and hedging effects is realized, the pressure reduction effect is obviously improved, the outlet pressure is stabilized, and the high-precision pressure stabilization target is achieved.

Description

Technical Field

[0001] This invention relates to the field of high-pressure hydrogen pressure reducing valve technology, specifically to a pressure reducing valve core based on 3D printing and a high-pressure hydrogen regulating valve having the same. Background Technology

[0002] Ultra-high pressure differential (>100MPa) hydrogen energy regulating valves are key control components in the core links of the hydrogen energy industry chain, such as hydrogen energy storage and transportation, ultra-high pressure hydrogen refueling stations, and hydrogen energy heavy equipment. Their pressure control accuracy, flow channel adaptability, and compatibility with hydrogen medium directly determine the safety, stability, and process reliability of ultra-high pressure hydrogen energy systems.

[0003] However, the existing hydrogen regulating valves tend to have simplified flow channel designs, resulting in low internal space utilization efficiency. They are difficult to adapt to the complex flow field characteristics under ultra-high pressure differential hydrogen conditions and cannot alleviate the local impact problem of hydrogen medium under high pressure differential through flow channel optimization. They generally suffer from technical bottlenecks such as fluid excitation, instability in small flow rate regulation, and insufficient flow capacity in large flow rates. This not only seriously affects the pressure control accuracy, sealing reliability, and hydrogen embrittlement resistance of the regulating valves, but also restricts their engineering application under the harsh conditions of ultra-high pressure differential hydrogen energy, becoming a key obstacle to the localization and high-end development of ultra-high pressure hydrogen energy equipment.

[0004] Therefore, providing a pressure reducing valve core based on 3D printing and a high-pressure hydrogen regulating valve having the same is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a pressure reducing valve core based on 3D printing and a high-pressure hydrogen regulating valve having the same, so as to achieve stable pressure reduction under ultra-high pressure differential.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A pressure-reducing valve core based on 3D printing includes a valve core inner shell, a valve core outer shell, and multiple fluid labyrinth valve core bodies connected together. The multiple fluid labyrinth valve core bodies are located between the valve core inner shell and the valve core outer shell and are arranged sequentially from the inside to the outside to form a connected volumetric cavity and a first annular cavity between the fluid labyrinth valve core bodies and the valve core outer shell. Each fluid labyrinth valve core body communicates with the volumetric cavity. The valve core inner shell has a gas inlet; the valve core outer shell has a gas outlet communicating with the first annular cavity; and the multiple fluid labyrinth valve core bodies are connected to the valve core inner shell through multiple vertically arranged flow channels.

[0008] Furthermore, each of the fluid labyrinth valve cores has a second annular cavity, multiple evenly distributed flow channels, and multiple oblique flow channels on its surface. The second annular cavity has an inlet hole. The valve core inner shell is connected to the inlet hole through the flow channels. Each flow channel includes a vertical straight channel and multiple arc flow channels. One end of the vertical straight channel is the valve core inlet, and the other end is the valve core outlet. The valve core inlet is connected to the second annular cavity. The valve core outlet is connected to the volumetric cavity. The multiple arc flow channels are staggered on both sides of the vertical straight channel. The adjacent arc flow channels of two adjacent flow channels are connected through the oblique flow channels.

[0009] A high-pressure hydrogen regulating valve includes a valve body, an upper valve cover, a valve stem, packing, a packing pressure plate, a pressure disc spring, and a pressure-reducing valve core as described above. The valve body has an inlet and an outlet; the inlet communicates with the gas inlet; the outlet communicates with the gas outlet; the upper valve cover is fixed to the top of the valve body by a first double-ended stud and a first nut; the valve stem extends through the upper valve cover into the inner shell of the valve core; the packing is filled between the valve stem and the upper valve cover; the packing pressure plate is fixed above the upper valve cover by a second double-ended stud and a second nut; the pressure disc spring is sleeved on the valve stem and located between the packing pressure plate and the packing; the pressure-reducing valve core is installed inside the valve body via a valve seat.

[0010] Therefore, the present invention provides a pressure reducing valve core based on 3D printing and a high-pressure hydrogen regulating valve having the same. Compared with the prior art, the present invention has the following beneficial effects: 1) The fluid labyrinth valve core structure greatly enhances the complexity and stability of fluid flow. When high-pressure hydrogen flows through these intricate channels, it is forced to continuously change its flow direction and flow cross-section, realizing a dual pressure reduction mechanism of throttling and counteracting effects, significantly improving the pressure reduction effect, stabilizing the outlet pressure, and achieving a high-precision pressure stabilization target. 2) The use of metal 3D printing to achieve integrated molding of the three-dimensional complex flow channel of the pressure reducing valve core can maximize the utilization of the internal space of the valve body and accurately adapt to the complex flow field characteristics of ultra-high pressure differential hydrogen medium. It can alleviate the problem of local fluid impact and vibration from the structural root, significantly improve the pressure control accuracy, flow regulation stability and flow capacity of the regulating valve, and enhance the resistance to hydrogen embrittlement and sealing reliability. It provides core support for the localization and high-end engineering application of ultra-high pressure differential hydrogen energy regulating valves. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0012] Figure 1 The attached figure is a cross-sectional view of the high-pressure hydrogen regulating valve provided by the present invention; Figure 2 The attached figure is a cross-sectional view of the fluid removal labyrinth valve core body of the pressure reducing valve core provided by the present invention; Figure 3 The attached figure is a schematic diagram of the structure of the fluid labyrinth valve core provided by the present invention; Figure 4 The attached figure is a cross-sectional view of the fluid labyrinth valve core, valve core inner shell, and flow channel mating relationship provided by the present invention. Figure 5 The attached figure is a cross-sectional view of the fit between the valve stem and the valve core inner shell provided by the present invention. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] like Figure 1-5 As shown, this invention discloses a pressure-reducing valve core based on 3D printing, comprising a valve core inner shell 1, a valve core outer shell 2, and multiple fluid labyrinth valve core bodies 3 connected together. The multiple fluid labyrinth valve core bodies 3 are all located between the valve core inner shell 1 and the valve core outer shell 2 and are arranged sequentially from the inside to the outside, forming a connected volumetric cavity 4 and a first annular cavity 5 between the fluid labyrinth valve core bodies 3 and the valve core outer shell 2. Each fluid labyrinth valve core body 3 is connected to the volumetric cavity 4. The valve core inner shell 1 has a gas inlet 11; the valve core outer shell 2 has a gas outlet 21 connected to the first annular cavity 5; the multiple fluid labyrinth valve core bodies 3 and the valve core inner shell 1 are respectively connected through multiple vertically arranged flow channels 6. This invention greatly enhances the complexity and stability of fluid flow, realizes a dual pressure-reducing mechanism of throttling and counter-pressure effects, significantly improves the pressure-reducing effect, stabilizes the outlet pressure, and achieves a high-precision pressure stabilization target.

[0015] Specifically, each fluid labyrinth valve core 3 has a second annular cavity 31, multiple evenly distributed flow channels, and multiple oblique flow channels 32 on its surface. The second annular cavity 31 has an inlet hole 311. The valve core inner shell 1 is connected to the inlet hole 311 through a flow channel 6. Each flow channel includes a vertical straight channel 33 and multiple arc flow channels 34. One end of the vertical straight channel 33 is the valve core inlet 331, and the other end of the vertical straight channel 33 is the valve core outlet 332. The valve core inlet 331 is connected to the second annular cavity 31. The valve core outlet 332 is connected to the volume chamber 4. Multiple arc flow channels 34 are staggered on both sides of the vertical straight channel 33. Multiple adjacent arc flow channels 34 of two adjacent flow channels are connected through oblique flow channels 32.

[0016] This invention also discloses a high-pressure hydrogen regulating valve, comprising a valve body 7, an upper valve cover 8, a valve stem 9, packing 10, a packing pressure plate 101, a clamping disc spring 102, and a pressure reducing valve core as described above. The valve body 7 has an inlet 71 and an outlet 72; the inlet 71 is connected to a gas inlet 21; the outlet 72 is connected to a gas outlet 21; the upper valve cover 8 is fixed to the top of the valve body 7 by a first double-ended stud and a first nut; the valve stem 9 extends through the upper valve cover 8 into the inner shell 1 of the valve core; the packing 10 is filled between the valve stem 9 and the upper valve cover 8; the packing pressure plate 101 is fixed above the upper valve cover 8 by a second double-ended stud and a second nut; the clamping disc spring 102 is sleeved on the valve stem 9 and located between the packing pressure plate 101 and the packing 10; the pressure reducing valve core is installed inside the valve body 7 through a valve seat 103.

[0017] Working principle of the invention: When valve stem 9 moves upward, the bottommost flow channel 6 is opened, and the fluid labyrinth valve core 3, which is connected to the bottommost flow channel 6, begins to work. High-pressure hydrogen gas is injected into the flow channel of valve body 7 through inlet 71, enters the pressure reducing valve core through the middle hole of valve seat 103, and then undergoes the following multi-stage pressure reduction process: gas enters through gas inlet 21, flows through the bottommost flow channel 6 into the corresponding inlet hole 311 of fluid labyrinth valve core 3, enters the second annular cavity 31 for buffering, hydrogen gas enters the vertical straight channel 33 through valve core inlet 331, flows along the vertical straight channel 33 and multiple arc flow channels 34, achieves pressure attenuation through gap throttling and multi-directional flow channel counterflow, and then enters the volume chamber 4 and the first annular cavity 5 through valve core outlet 332 in sequence, flows out through gas outlet 21, and finally flows downstream through outlet 72.

[0018] As the valve stem 9 continues to move upward, the second-lowest flow channel 6 and the bottom-most flow channel 6 open simultaneously, and the corresponding two fluid labyrinth valve cores 3 are put into operation.

[0019] Other operating states: Valve stem 9 continues to move upward, each flow channel 6 opens one by one, and each layer of fluid labyrinth valve core 3 is put into operation step by step.

[0020] The core pressure reduction mechanism of the entire flow process in this invention includes: abrupt cross-sectional effect: the step-like reduction of the flow cross-section leads to a surge in flow velocity, which intensifies the kinetic energy conversion and reduces pressure; viscous dissipation effect: the high viscosity of hydrogen and the continuous friction between the complex flow channel wall further enhance energy dissipation; and counter-current energy dissipation design: the multi-stage flow channel geometry enables active suppression of pressure fluctuations and balanced energy distribution.

[0021] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0022] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pressure reducing valve core based on 3D printing, characterized in that, The device includes a valve core inner shell, a valve core outer shell, and multiple fluid labyrinth valve core bodies connected together. Each of the multiple fluid labyrinth valve core bodies is located between the valve core inner shell and the valve core outer shell and is arranged sequentially from the inside to the outside, forming a connected volumetric cavity and a first annular cavity between the fluid labyrinth valve core bodies and the valve core outer shell. Each fluid labyrinth valve core body communicates with the volumetric cavity. The valve core inner shell has a gas inlet; the valve core outer shell has a gas outlet communicating with the first annular cavity; and the multiple fluid labyrinth valve core bodies are connected to the valve core inner shell through multiple vertically arranged flow channels.

2. The pressure reducing valve core based on 3D printing according to claim 1, characterized in that, Each of the fluid labyrinth valve cores has a second annular cavity, multiple evenly distributed flow channels, and multiple oblique flow channels on its surface. The second annular cavity has an inlet hole. The valve core inner shell is connected to the inlet hole through the flow channels. Each flow channel includes a vertical straight channel and multiple arc flow channels. One end of the vertical straight channel is the valve core inlet, and the other end is the valve core outlet. The valve core inlet is connected to the second annular cavity. The valve core outlet is connected to the volumetric cavity. The multiple arc flow channels are staggered on both sides of the vertical straight channel. The adjacent arc flow channels of two adjacent flow channels are connected through the oblique flow channels.

3. A high-pressure hydrogen regulating valve, characterized in that, The valve includes a valve body, an upper valve cover, a valve stem, packing, a packing pressure plate, a pressure disc spring, and a pressure-reducing valve core as described in claim 1 or 2. The valve body has an inlet and an outlet; the inlet is connected to the gas inlet; the outlet is connected to the gas outlet; the upper valve cover is fixed to the top of the valve body by a first double-ended stud and a first nut; the valve stem extends through the upper valve cover into the inner shell of the valve core; the packing is filled between the valve stem and the upper valve cover; the packing pressure plate is fixed above the upper valve cover by a second double-ended stud and a second nut; the pressure disc spring is sleeved on the valve stem and located between the packing pressure plate and the packing; the pressure-reducing valve core is installed inside the valve body via a valve seat.

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