A hydrogen flow restriction device

Abstract

The utility model discloses a kind of hydrogen flow limiting device, comprising: base, valve assembly and flow limiting component;The one end of the base is provided with air inlet, the other end is provided with air outlet, the air inlet is communicated to valve assembly, transition gas path is opened in the base, one end of the transition gas path is communicated with the outlet of valve assembly, the other end is communicated with the inlet of flow limiting component, the valve assembly is used to limit hydrogen into flow limiting component;The flow limiting component includes: flow limiting base and flow limiting needle;Flow limiting gas path is opened on the flow limiting base, the flow limiting gas path is communicated with transition gas path, the flow limiting needle is located at the first end of flow limiting gas path, the first end of flow limiting gas path is communicated to air outlet, and the flow limiting needle is used to control the gas flow of entering air outlet.The utility model can adjust 0-300ml / min to hydrogen micro-flow, and the precision difference of adjustment reaches 0.01ml.

Description

Technical Field

[0001] This utility model relates to the field of flow limiting equipment technology, and in particular to a hydrogen flow limiting device. Background Technology

[0002] The hydrogen flow limiting module, based on the critical flow principle, uses a sophisticated internal structure to actively limit the maximum flow rate of leaked hydrogen to a fixed value in the event of a downstream pipeline rupture. This passive safety device requires no external intervention and physically eliminates the possibility of catastrophic large-scale leaks, providing crucial active safety assurance for applications such as hydrogen refueling stations and fuel cell vehicles. It is a core link in the hydrogen energy safety chain. Current hydrogen flow limiting modules cannot achieve micro-flow regulation, and the regulation precision is poor. Summary of the Invention

[0003] According to an embodiment of the present invention, a hydrogen flow limiting device is provided, comprising: a base, a valve assembly, and a flow limiting assembly; The base has an air inlet at one end and an air outlet at the other end. The air inlet is connected to the valve assembly. A transition gas passage is provided inside the base. One end of the transition gas passage is connected to the outlet of the valve assembly and the other end is connected to the inlet of the flow limiting assembly. The valve assembly is used to restrict hydrogen from entering the flow limiting assembly. The current limiting component includes: a current limiting base and a current limiting pin; The flow-limiting base has a flow-limiting gas path, which is connected to the transition gas path. The flow-limiting needle is located at the first end of the flow-limiting gas path, which is connected to the gas outlet. The flow-limiting needle is used to control the gas flow rate entering the gas outlet.

[0004] Furthermore, the current limiting component also includes: a current limiting top cover, a current limiting diaphragm, and a current limiting spring; The current-limiting top cover is located on one side of the current-limiting base. The current-limiting diaphragm is located between the current-limiting top cover and the current-limiting base and is fixed on the current-limiting base. One end of the current-limiting spring is connected to the current-limiting base and the other end is pressed against the current-limiting diaphragm. The current-limiting diaphragm has a first chamber and a second chamber on both sides.

[0005] Furthermore, a first air hole is provided in the flow-limiting base, and a first guide hole and a second guide hole are provided on the flow-limiting top cover. One end of the first air hole is connected to the transition air passage and the other end is connected to the first guide hole. The first guide hole is connected to the first chamber, and one end of the second guide hole is connected to the first chamber and the other end is connected to the flow-limiting air passage.

[0006] Furthermore, the first end of the flow-limiting air passage is connected to the second chamber, and the second chamber is connected to the air outlet.

[0007] Furthermore, the bottom of the flow-limiting needle is provided with a stud, which is positioned at the connection between the flow-limiting air passage and the second chamber. The top of the flow-limiting needle is provided with a flow-limiting pressure cap, which is used to rotate the flow-limiting needle to control the position of the stud.

[0008] Furthermore, the valve assembly includes: a valve body, a piston, and a valve spring; The valve housing has an air inlet and an air outlet, the air inlet and the air outlet are connected, the piston is slidably disposed in the valve housing and is disposed corresponding to the air inlet, one end of the valve spring is connected to the valve housing and the other end is connected to the piston.

[0009] Furthermore, a pneumatic connector is provided on one side of the valve body, and the pneumatic connector is connected to one side of the piston.

[0010] According to an embodiment of the present invention, a hydrogen flow limiting device is provided. Hydrogen gas is introduced into a valve assembly through an inlet. By opening the valve assembly, hydrogen gas enters a transition gas path and then enters a flow limiting gas path. A flow limiting needle is used to control the flow rate of hydrogen gas from the flow limiting gas path to the outlet, thereby achieving micro-flow rate adjustment of hydrogen gas from 0-300 ml / min with an adjustment accuracy of 0.01 ml.

[0011] It should be understood that both the foregoing general description and the following detailed description are exemplary and intended to provide further illustration of the claimed technology. Attached Figure Description

[0012] Figure 1 This is a structural diagram of a hydrogen flow limiting device according to an embodiment of the present invention; Figure 2 This is a structural diagram of another hydrogen flow limiting device according to an embodiment of the present invention; Figure 3 This is a front view of a hydrogen flow limiting device according to an embodiment of the present invention; Figure 4 This is a front sectional view of a hydrogen flow limiting device according to an embodiment of the present invention; Figure 5 This is a front sectional view of another hydrogen flow limiting device according to an embodiment of the present invention; Figure 6 This is a front sectional view of another hydrogen flow limiting device according to an embodiment of the present invention; Figure 7 This is a side sectional view of a hydrogen flow limiting device according to an embodiment of the present invention; Figure 8 This is a side sectional view of another hydrogen flow limiting device according to an embodiment of the present utility model; Figure 9This is a side sectional view of another hydrogen flow limiting device according to an embodiment of the present invention; Figure 10 This is a structural diagram of a flow-limiting top cover for a hydrogen flow-limiting device according to an embodiment of the present invention.

[0013] In the attached diagram, the following labels are used: 1 is the base, 11 is the air inlet, 12 is the air outlet, 13 is the transition air passage, 2 is the valve assembly, 21 is the valve body, 22 is the piston, 23 is the valve spring, 24 is the air passage inlet, 25 is the air passage outlet, 26 is the air passage connector, 3 is the flow limiting assembly, 31 is the flow limiting base, 32 is the flow limiting top cover, 33 is the flow limiting needle, 331 is the stud, 332 is the flow limiting cap, 34 is the flow limiting spring, 35 is the flow limiting diaphragm, 36 is the first air hole, 37 is the first guide hole, 38 is the second guide hole, and 39 is the flow limiting air passage. Detailed Implementation

[0014] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, further illustrating the present invention.

[0015] First, combine Figures 1-10 This invention describes a hydrogen flow limiting device according to an embodiment of the present invention, used to limit the flow rate of hydrogen.

[0016] like Figures 1-10 As shown, a hydrogen flow limiting device according to an embodiment of the present invention includes: a base 1, a valve assembly 2, and a flow limiting assembly 3; The base 1 has an air inlet 11 at one end and an air outlet 12 at the other end. The air inlet 11 is connected to the valve assembly 2. The base 1 has a transition gas passage 13 inside. One end of the transition gas passage 13 is connected to the outlet of the valve assembly 2 and the other end is connected to the inlet of the flow limiting assembly 3. The valve assembly 2 is used to restrict hydrogen from entering the flow limiting assembly 3. The current limiting component 3 includes: a current limiting base 31 and a current limiting pin 33; The flow-limiting base 31 has a flow-limiting gas passage 39, which is connected to the transition gas passage 13. The flow-limiting needle 33 is located at the first end of the flow-limiting gas passage 39, which is connected to the gas outlet 12. The flow-limiting needle 33 is used to control the gas flow rate entering the gas outlet 12.

[0017] In this application, hydrogen gas is introduced into valve assembly 2 through inlet 11. By opening valve assembly 2, hydrogen gas enters transition gas path 13 and then enters flow-limiting gas path 39. The flow-limiting needle 33 controls the flow rate of hydrogen gas from flow-limiting gas path 39 to outlet 12, thereby achieving micro-flow rate adjustment of hydrogen gas from 0-300 ml / min with an adjustment accuracy of 0.01 ml.

[0018] like Figures 4-8 As shown, the current limiting component 3 further includes: a current limiting top cover 32, a current limiting diaphragm 35, and a current limiting spring 34; The current-limiting top cover 32 is disposed on one side of the current-limiting base 31. The current-limiting diaphragm 35 is disposed between the current-limiting top cover 32 and the current-limiting base 31 and is fixed on the current-limiting base 31. One end of the current-limiting spring 34 is connected to the current-limiting base 31, and the other end presses against the current-limiting diaphragm 35. The current-limiting diaphragm 35 has a first chamber and a second chamber on both sides. One end of the current-limiting spring 34 is connected to a top plate. By pressing the top plate against the current-limiting diaphragm 35, the current-limiting spring 34 compresses the space of the first chamber, thereby achieving a current-limiting and sealing function. The flow-limiting base 31 has a first air hole 36, and the flow-limiting top cover 32 has a first guide hole 37 and a second guide hole 38. One end of the first air hole 36 is connected to the transition air passage 13 and the other end is connected to the first guide hole 37. The first guide hole 37 is connected to the first chamber. One end of the second guide hole 38 is connected to the first chamber and the other end is connected to the flow-limiting air passage 39.

[0019] The first end of the flow-limiting air passage 39 is connected to the second chamber, and the second chamber is connected to the air outlet 12.

[0020] In this embodiment, hydrogen in the transition gas path 13 enters the first gas hole 36 and is guided to the first chamber through the first guide hole 37. The hydrogen in the first chamber is guided to the flow-limiting gas path 39 through the second guide hole 38. The flow-limiting needle 33 limits the flow of hydrogen, allowing it to enter the second chamber. The hydrogen in the second chamber is discharged through the gas outlet 12.

[0021] like Figures 6-8 As shown, the bottom of the flow limiting needle 33 is provided with a stud 331, which is provided at the connection between the flow limiting air passage 39 and the second chamber. The top of the flow limiting needle 33 is provided with a flow limiting cap 332, which is used to rotate the flow limiting needle 33 to control the position of the stud 331.

[0022] In this embodiment, the flow-limiting cap 332 can rotate the flow-limiting needle 33, thereby adjusting the height of the stud 331 and thus adjusting the flow rate of hydrogen.

[0023] like Figure 9 As shown, the valve assembly 2 includes: a valve body 21, a piston 22, and a valve spring 23; The valve housing 21 has an air inlet 24 and an air outlet 25. The air inlet 24 and the air outlet 25 are connected. The piston 22 is slidably disposed in the valve housing 21 and is disposed corresponding to the air inlet 24. One end of the valve spring 23 is connected to the valve housing 21 and the other end is connected to the piston 22.

[0024] A pneumatic connector 26 is provided on one side of the valve housing 21, and the pneumatic connector 26 is connected to one side of the piston 22.

[0025] In this embodiment, the piston 22 is pushed by the elastic force of the valve spring 23, so that the piston 22 seals the gas inlet 24. Air is introduced into the piston 22 through the gas connector 26. The air lifts the piston 22, so that the gas inlet 24 is connected to the gas outlet 25, allowing hydrogen to enter the transition gas path 13.

[0026] Above, refer to Figures 1-10 According to an embodiment of the present invention, hydrogen gas is introduced into valve assembly 2 through inlet 11. By opening valve assembly 2, hydrogen gas enters transition gas path 13 and then enters flow-limiting gas path 39. The flow-limiting needle 33 controls the flow rate of hydrogen gas from flow-limiting gas path 39 to outlet 12, thereby achieving micro-flow rate adjustment of hydrogen gas from 0-300 ml / min with an adjustment accuracy of 0.01 ml.

[0027] It should be noted that, in this specification, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0028] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A hydrogen flow limiting device, characterized in that, include: Base, valve assembly, and flow limiting assembly; The base has an air inlet at one end and an air outlet at the other end. The air inlet is connected to the valve assembly. A transition gas passage is provided inside the base. One end of the transition gas passage is connected to the outlet of the valve assembly and the other end is connected to the inlet of the flow limiting assembly. The valve assembly is used to restrict hydrogen from entering the flow limiting assembly. The current limiting component includes: a current limiting base and a current limiting pin; The flow-limiting base has a flow-limiting gas path, which is connected to the transition gas path. The flow-limiting needle is located at the first end of the flow-limiting gas path, which is connected to the gas outlet. The flow-limiting needle is used to control the gas flow rate entering the gas outlet.

2. The hydrogen flow limiting device as described in claim 1, characterized in that, The current limiting component also includes: a current limiting top cover, a current limiting diaphragm, and a current limiting spring; The current-limiting top cover is located on one side of the current-limiting base. The current-limiting diaphragm is located between the current-limiting top cover and the current-limiting base and is fixed on the current-limiting base. One end of the current-limiting spring is connected to the current-limiting base and the other end is pressed against the current-limiting diaphragm. The current-limiting diaphragm has a first chamber and a second chamber on both sides.

3. The hydrogen flow limiting device as described in claim 2, characterized in that, The flow-limiting base has a first air hole, and the flow-limiting top cover has a first guide hole and a second guide hole. One end of the first air hole is connected to the transition air passage and the other end is connected to the first guide hole. The first guide hole is connected to the first chamber, and one end of the second guide hole is connected to the first chamber and the other end is connected to the flow-limiting air passage.

4. The hydrogen flow limiting device as described in claim 2, characterized in that, The first end of the flow-limiting air passage is connected to the second chamber, and the second chamber is connected to the air outlet.

5. The hydrogen flow limiting device as described in claim 4, characterized in that, The bottom of the flow-limiting needle is provided with a stud, which is set at the connection between the flow-limiting air passage and the second chamber. The top of the flow-limiting needle is provided with a flow-limiting pressure cap, which is used to rotate the flow-limiting needle to control the position of the stud.

6. The hydrogen flow limiting device as described in claim 1, characterized in that, The valve assembly includes: a valve body, a piston, and a valve spring; The valve housing has an air inlet and an air outlet, the air inlet and the air outlet are connected, the piston is slidably disposed in the valve housing and is disposed corresponding to the air inlet, one end of the valve spring is connected to the valve housing and the other end is connected to the piston.

7. The hydrogen flow limiting device as described in claim 6, characterized in that, A pneumatic connector is provided on one side of the valve body, and the pneumatic connector is connected to one side of the piston.

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