A gas pressure regulating device, a noise reduction device and a noise reduction method

Abstract

The present invention relates to the technical field of gas equipment, and discloses a gas pressure regulating device, a noise reduction device and a noise reduction method, which include an aluminum foam sheet built in a valve barrel and a valve cover for covering the valve barrel. The aluminum foam sheet is connected to the valve cover. The porosity of the aluminum foam sheet is set at 60-85%, and the pore diameter of the aluminum foam sheet is set at 0.2-1.5 mm. The gas pressure regulating device, the noise reduction device and the noise reduction method of the present invention are easy to process, reduce the noise at the valve port, have low noise reduction cost, are simple to manufacture and have wide applicability.

Description

Technical Field

[0001] The present invention relates to the technical field of gas equipment, and particularly to a gas pressure regulating device and a noise reduction device. Background Art

[0002] Gas pressure regulating equipment plays a role in reducing high-pressure gas flow to low-pressure gas flow during gas transmission and distribution, and its function is similar to that of a power transformer. However, during the process of gas flow pressure reduction, due to the rapid change of gas flow, intense impact on the inner wall of the regulating equipment will occur inside the regulating equipment, generating low-frequency noise. This noise is likely to cause discomfort to people and will also lead to the operating noise of the pressure regulating equipment exceeding the national environmental protection standards, resulting in complaints from residential users. With the development of users, the consumption of natural gas has gradually increased, and some pressure regulating equipment has also shifted from early low-load operation to high-load operation, and the noise problem of pressure regulating equipment has become increasingly prominent. Therefore, how to effectively solve this problem and reduce user complaints has become an urgent need for current gas enterprises.

[0003] Currently, the noise reduction measures for pressure regulating equipment mainly include the following two methods: one is to lay sound insulation materials on the outer shell of the equipment to block the transmission of noise, and generally ordinary sound-absorbing cotton is used as the sound insulation material; the other is to replace the pressure regulating equipment with a larger flow rate. Summary of the Invention

[0004] The first object of the present invention is to provide a noise reduction device that is easy to process and can reduce the noise at the valve port.

[0005] The second object of the present invention is to provide a gas pressure regulating equipment with low noise at the valve port and low noise reduction cost.

[0006] The third object of the present invention is to provide a noise reduction method for a gas pressure regulating equipment that is simple to manufacture, has a wide applicability, and has a good noise reduction effect.

[0007] To achieve the above objects, the present invention provides a noise reduction device for a gas pressure regulating equipment, which includes an aluminum foam sheet disposed inside a valve barrel and a valve cover for covering the valve barrel. The aluminum foam sheet is connected to the valve cover. The porosity of the aluminum foam sheet is set at 60 - 85%, and the pore diameter of the aluminum foam sheet is set at 0.2 - 1.5 mm.

[0008] As a preferred solution, the aluminum foam sheet includes a first side and a second side, and the first side and the second side are connected to form an annular aluminum foam body, and the inner wall of the annular aluminum foam body forms a gas collection chamber.

[0009] As a preferred solution, the thickness of the aluminum foam sheet is set at 3 mm - 5 mm.

[0010] A gas pressure regulating device includes a valve. The valve is provided with a valve barrel. One end of the valve barrel is provided with a valve port, and the valve port is covered with a valve cover. A foam aluminum sheet is connected to the side of the valve cover facing the valve port, and the foam aluminum sheet is placed inside the end of the valve barrel where the valve port is located.

[0011] As a preferred solution, the pore diameter of the foam aluminum sheet is set at 0.2 - 1.5 mm.

[0012] As a preferred solution, the porosity of the foam aluminum sheet is set at 60% - 85%.

[0013] As a preferred solution, the foam aluminum sheet includes a first side and a second side. The first side and the second side are connected to form an annular foam aluminum body, and the inner wall of the annular foam aluminum body forms a gas collection chamber.

[0014] As a preferred solution, the valve is provided with an intake pipe communicating with the valve barrel and an outlet pipe communicating with the valve barrel. The intake pipe and the outlet pipe are respectively located on both sides of the valve barrel. The intake pipe is located above the valve barrel and is communicated with the gas collection chamber, and the outlet pipe is located on one side of the annular foam aluminum body.

[0015] A noise reduction method for a gas pressure regulating device includes the following steps:

[0016] Step 1: Produce a foam aluminum sheet through a foaming process. The porosity of the foam aluminum sheet is controlled at 60 - 85%, and the pore diameter range of the foam aluminum sheet is controlled at 0.2 - 1.5 mm.

[0017] Step 2: Cut the foam aluminum sheet according to the size of the valve barrel of the pressure regulating device valve. The two ends of the foam aluminum sheet are welded to form an annular foam aluminum body. The valve barrel is covered with a valve cover. Place the annular foam aluminum body on the top surface of the valve cover, and push the annular foam aluminum body into the valve barrel through the valve cover, so that the outer contour of the annular foam aluminum body abuts against the inner wall of the valve barrel, and the valve cover is installed on the valve barrel.

[0018] As a preferred solution, the foam aluminum sheet is composed of 42% aluminum, 35% nickel, 6% copper, and 17% fiber.

[0019] Compared with the prior art, the beneficial effect of the noise reduction device of the gas pressure regulating device in the embodiment of the present invention is that when the gas transported from the intake pipeline passes through the foam aluminum sheet installed at the valve port, the small holes with a diameter of 0.2 - 1.5 mm on the foam aluminum sheet with a porosity of 60 - 85% perform small hole injection on the air flow, thereby changing the original air flow movement direction. Utilize the gas to be transported from the valve barrel through the foam aluminum sheet. The frequency spectrum of the jet noise will shift from low frequency to multiple frequency bands, significantly reducing the audible sound component in the frequency spectrum, thereby reducing the interference to people, and further achieving the purpose of eliminating noise.

[0020] Compared with the prior art, the beneficial effects of a gas pressure regulating device according to an embodiment of the present invention are as follows: The noise source of the gas pressure regulating device mainly occurs at the valve. Since the flow velocity changes sharply during the pressure reduction process of the gas flow, the gas flow will violently impact the inner wall of the valve port inside, generating low-frequency noise. According to the cause and characteristics of the noise generation, the aluminum foam sheet is placed at one end of the valve barrel provided with the valve port. When the gas transported from the intake pipe passes through the aluminum foam sheet installed at the valve port, the small holes on the aluminum foam sheet perform small-hole injection on the gas flow, thereby changing the original gas flow movement direction. By using the gas to be transported from the valve barrel through the aluminum foam sheet to the outside, the frequency spectrum of the jet noise will shift from low frequency to multiple frequency bands, significantly reducing the audible sound component in the frequency spectrum, thereby reducing the interference to people and further achieving the purpose of eliminating noise.

[0021] Compared with the prior art, the beneficial effects of a noise reduction method for a gas pressure regulating device according to an embodiment of the present invention are as follows: The valve port sizes of gas pressure regulating devices vary widely, and it is difficult to produce a standardized product to meet general requirements. The aluminum foam sheet is easy to process. It can be adjusted in size and specifications according to the valve port size of the on-site equipment. It is light in weight and convenient to carry. After cutting the aluminum foam sheet, a ring-shaped aluminum foam body is prepared by welding. The valve cover is used to support and fix the ring-shaped aluminum foam body, so that the ring-shaped aluminum foam body can completely enter the valve barrel and closely adhere to the inner wall of the valve barrel at the valve port. When the gas transported from the intake pipe passes through the ring-shaped aluminum foam body installed at the valve port, the small holes with a diameter of 0.2 - 1.5 mm on the ring-shaped aluminum foam body perform small-hole injection on the gas flow, thereby changing the original gas flow movement direction. By using the gas to be transported from the valve barrel through the ring-shaped aluminum foam body to the outside, the frequency spectrum of the jet noise will shift from low frequency to multiple frequency bands, significantly reducing the audible sound component in the frequency spectrum, thereby reducing the interference to people and further achieving the purpose of eliminating noise. The noise reduction method of the present invention is simple to manufacture, has wide applicability, and at the same time, has good noise reduction effect. Description of the Drawings

[0022] Figure 1 is the overall structural schematic diagram of an embodiment of the present invention.

[0023] Figure 2 is the structural schematic diagram of the aluminum foam sheet of an embodiment of the present invention.

[0024] Figure 3 is the structural schematic diagram of the ring-shaped aluminum foam body of an embodiment of the present invention.

[0025] Figure 4 is the schematic diagram of the aperture data table of an embodiment of the present invention.

[0026] In the figure:

[0027] 10. Valve; 11. Intake pipe; 12. Outlet pipe; 13. Weld seam;

[0028] 20. Foamed aluminum sheet; 21. Gas collection chamber; 22. Annular foamed aluminum body; 23. Small holes;

[0029] 30. Valve barrel;

[0030] 40. Valve cover. Specific embodiments

[0031] The following will further describe in detail the specific embodiments of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0032] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. in the present invention is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0033] In the description of the present invention, it should be understood that the terms "connected", "connected", "fixed", etc. used in the present invention should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection, a welded connection; it can be directly connected, or indirectly connected through an intermediate medium. It can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] As Figures 1 to 4 shown, a noise reduction device for a gas pressure regulating device according to a preferred embodiment of an embodiment of the present invention includes a foamed aluminum sheet 20 built in a valve barrel 30 and a valve cover 40 for covering the valve barrel 30. The foamed aluminum sheet 20 is connected to the valve cover 40. The porosity of the foamed aluminum sheet 20 is set at 60 - 85%, and the pore diameter of the foamed aluminum sheet 20 is set at 0.2 - 1.5 mm.

[0035] In the noise reduction device of the gas pressure regulating equipment of the present invention, through theoretical analysis and equipment verification, it is known that the noise source of the gas pressure regulating equipment mainly generates at the valve port. Due to the sharp change in the flow velocity during the pressure reduction process of the gas flow, the gas flow will violently impact the inner wall of the valve port inside, generating low-frequency noise. According to the cause and characteristics of the noise generation, the aluminum foam sheet 20 is installed at the valve port. When the gas transported from the air inlet pipe 11 passes through the aluminum foam sheet 20 installed at the valve port, the small holes 23 with a diameter of 0.2 - 1.5 mm on the aluminum foam sheet 20 perform small hole injection on the gas flow, thereby changing the original gas flow movement direction. Utilizing the gas transported from the inside of the valve barrel 30 through the aluminum foam sheet 20 to the outside, the frequency spectrum of the jet noise will shift from low frequency to multiple frequency bands, significantly reducing the audible sound component in the frequency spectrum, thereby reducing the interference to people and further achieving the purpose of eliminating noise. The aluminum foam sheet 20 can be cut according to the size of the valve port of the pressure regulating equipment. At the same time, due to the inconsistent sizes of the valve ports of the gas pressure regulating equipment, it is difficult to produce a standardized product to meet the general requirements. The aluminum foam sheet 20 has the characteristics of easy processing, can adjust its size and specifications according to the valve port size of the on-site equipment, is light in weight and convenient to carry. As Figure 4 shown, the small holes 23 with a diameter of 0.2 - 1.5 mm on the aluminum foam sheet 20 can not only ensure that the pressure loss is not significantly reduced, but also effectively reduce noise. When the porosity exceeds 80%, the pressure loss for fluid flow is too large, affecting the transportation and distribution performance; when it is lower than 60%, the noise reduction effect is not obvious. Therefore, the porosity of 60 - 80% of the aluminum foam sheet 20 is the best ratio. The valve cover 40 supports the aluminum foam sheet 20 and is convenient for the installation of the aluminum foam sheet 20, preventing the aluminum foam sheet 20 from deforming during installation and affecting the noise reduction effect. The noise reduction device of the present invention can avoid installing sound-absorbing cotton on the entire pressure regulating equipment or replacing the pressure regulating equipment, reducing the workload and having good economic benefits.

[0036] Furthermore, as Figure 2 shown, the aluminum foam sheet 20 includes a first side and a second side. The first side and the second side are connected to form an annular aluminum foam body 22. The inner wall of the annular aluminum foam body 22 forms a gas collection cavity 21. The outer side of the annular aluminum foam body 22 is a circular smooth surface. The outer side surface of the annular aluminum foam body 22 abuts against the inner wall of the valve barrel 30 close to the valve port, enabling the gas flow in the gas pipeline to concentrate and enter the gas collection cavity 21, and achieving noise reduction through the small holes 23 on the aluminum foam sheet 20, avoiding the generation of regenerative noise between the aluminum foam sheet 20 and the wall of the valve barrel 30, and having a good noise reduction effect.

[0037] Furthermore, as Figures 2 to 3As shown in the figure, the thickness of the aluminum foam sheet 20 is too small. Due to the impact of natural gas on the aluminum foam sheet 20 inside the valve barrel 30, the support strength is insufficient and the tensile strength is low. If the thickness of the aluminum foam sheet 20 is too large, it cannot be bent manually, and the aluminum foam sheet 20 cannot be placed at the valve opening of the equipment. The thickness of the aluminum foam sheet 20 is set at 3 mm - 5 mm, which meets the requirements of support strength and tensile strength, and at the same time is convenient for manual processing and then placing it inside the equipment valve barrel 30.

[0038] As Figures 1 to 4 As shown in the figure, a gas pressure regulating device includes a valve 10. The valve 10 is provided with a valve barrel 30. One end of the valve barrel 30 is provided with a valve opening, and the valve opening is covered with a valve cover 40. One side of the valve cover 40 facing the valve opening is connected with an aluminum foam sheet 20, and the aluminum foam sheet 20 is placed inside one end of the valve barrel 30 provided with the valve opening.

[0039] For the gas pressure regulating device of the present invention, through theoretical analysis and equipment verification, it is known that the noise source of the gas pressure regulating device mainly generates at the valve 10. Since the flow velocity changes sharply during the pressure reduction process of the gas flow, the gas flow will violently impact the inner wall of the valve opening inside, generating low-frequency noise. According to the cause and characteristics of the noise generation, the aluminum foam sheet 20 is placed inside one end of the valve barrel 30 provided with the valve opening. When the gas transported by the intake pipe 11 passes through the aluminum foam sheet 20 installed at the valve opening, the small holes 23 on the aluminum foam sheet 20 perform small hole 23 injection on the gas flow, thereby changing the original gas flow movement direction. Using the gas transported from inside the valve barrel 30 through the aluminum foam sheet 20 to the outside, the frequency spectrum of the jet noise will shift from low frequency to multiple frequency bands, making the audible sound component in the frequency spectrum significantly reduced, thereby reducing the interference to people and further achieving the purpose of noise elimination. The aluminum foam sheet 20 can be cut according to the size of the valve opening of the pressure regulating device. At the same time, since the valve opening sizes of gas pressure regulating devices are not uniform, it is difficult to produce a fixed-type product to meet the general requirements. The aluminum foam sheet 20 has the characteristics of easy processing, can adjust its size and specifications according to the valve opening size of the on-site equipment, is light in weight and convenient to carry. The valve cover 40 supports the aluminum foam sheet 20 and is convenient for the installation of the aluminum foam sheet 20, preventing the aluminum foam sheet 20 from deforming during installation and affecting the noise reduction effect. The noise reduction device of the present invention can avoid installing sound-absorbing cotton on the entire pressure regulating device or replacing the pressure regulating device, reducing the workload and having good economic benefits.

[0040] When the noise reduction device of the present invention is not installed at the valve barrel 30, the sound decibel value at a distance of 1 meter from the valve barrel 30 is in the range of 67.81 - 70.10. After installing the noise reduction device of the present invention, the sound decibel value at a distance of 1 meter from the valve barrel 30 is in the range of 51.33 - 54.43. It can be seen from the data comparison that after installing the noise reduction device of the present invention, the noise is significantly reduced.

[0041] Furthermore, as Figures 1 to 3As shown, the pore diameter of the aluminum foam sheet 20 is set at 0.2 - 1.5 mm. The small holes 23 with a diameter of 0.2 - 1.5 mm on the aluminum foam sheet 20 can not only ensure that the pressure loss is not significantly reduced, but also effectively reduce noise.

[0042] Furthermore, as Figures 1 to 3 shown, the porosity of the aluminum foam sheet 20 is set at 60% - 85%. If the porosity exceeds 80%, the pressure loss for fluid flow is too large, affecting the transportation and distribution performance; if it is lower than 60%, the noise reduction effect is not obvious. Therefore, the porosity of 60 - 80% of the aluminum foam sheet 20 is the optimal ratio for noise reduction when installed in the valve barrel 30 of the gas equipment.

[0043] Furthermore, as Figure 2 shown, the aluminum foam sheet 20 includes a first side and a second side. The first side and the second side are connected to form an annular aluminum foam body 22, and the inner wall of the annular aluminum foam body 22 forms a gas collection chamber 21. The outer side of the annular aluminum foam body 22 is a smooth circular surface. The outer side of the annular aluminum foam body 22 abuts against the inner wall of the valve port, so that the airflow in the gas pipeline is concentrated and enters the gas collection chamber 21, and noise reduction is achieved through the small holes 23 on the aluminum foam sheet 20, avoiding the generation of regenerative noise between the aluminum foam sheet 20 and the valve port, and having a good noise reduction effect. Specifically, the outer contour of the annular aluminum foam body 22 abuts against the inner wall of the valve barrel 30 so that the annular aluminum foam body 22 fills the valve barrel 30 to achieve a better noise reduction effect. The first side and the second side of the aluminum foam sheet 20 are welded to form a weld seam 13.

[0044] Furthermore, as Figure 1 shown, the valve 10 is provided with an intake pipe 11 communicating with the valve barrel 30 and an outlet pipe 12 communicating with the valve barrel 30. The intake pipe 11 and the outlet pipe 12 are respectively located on both sides of the valve barrel 30. The intake pipe 11 is located above the valve barrel 30 and is communicated with the gas collection chamber 21, and the outlet pipe 12 is located on one side of the annular aluminum foam body 22.

[0045] As Figures 1 to 4 shown, a noise reduction method for a gas pressure regulating device includes the following steps:

[0046] Step 1: Fabricate the aluminum foam sheet 20 through a foaming process. The porosity of the aluminum foam sheet 20 is controlled within 60 - 85%, and the pore diameter range of the aluminum foam sheet 20 is controlled within 0.2 - 1.5 mm;

[0047] Step 2: Cut the aluminum foam sheet 20 according to the size of the valve barrel 30 of the valve 10 of the pressure regulating device. The two ends of the aluminum foam sheet 20 are welded to form an annular aluminum foam body 22. The valve barrel 30 is covered with a valve cover 40. Place the annular aluminum foam body 22 on the top surface of the valve cover 40, and push the annular aluminum foam body 22 into the valve barrel 30 through the valve cover 40 so that the outer contour of the annular aluminum foam body 22 abuts against the inner wall of the valve barrel 30, and the valve cover 40 is installed on the valve barrel 30.

[0048] Noise reduction method for the gas pressure regulating equipment of this valve 10. Since the noise source of the gas pressure regulating equipment mainly generates at the valve port. It is because during the pressure reduction process of the air flow, the sharp change in the flow velocity causes the air flow to violently impact the inner wall of the valve port inside, generating low-frequency noise. The valve port sizes of the gas pressure regulating equipment vary greatly, and it is difficult to produce a standardized product to meet general requirements. The aluminum foam sheet 20 is easy to process, and its size and specifications can be adjusted according to the valve port size of the on-site equipment. It is light in weight and convenient to carry. After cutting the aluminum foam sheet 20, a ring-shaped aluminum foam body 22 is prepared by welding. The valve cover 40 is used to support and fix the ring-shaped aluminum foam body 22, so that the ring-shaped aluminum foam body 22 can completely enter the valve barrel 30 and closely adhere to the inner wall of the valve barrel 30 at the valve port. When the gas transported by the intake pipe 11 passes through the ring-shaped aluminum foam body 22 installed at the valve port, the small holes 23 with a diameter of 0.2 - 1.5 mm on the ring-shaped aluminum foam body 22 inject the air flow through the small holes 23, thereby changing the original air flow movement direction. By using the gas to be transported from the valve barrel 30 through the ring-shaped aluminum foam body 22 outward, the frequency spectrum of the jet noise will shift from low frequency to multiple frequency bands, significantly reducing the audible sound component in the frequency spectrum, thereby reducing the interference to people and further achieving the purpose of eliminating noise. The noise reduction method of the present invention is simple to manufacture, has wide applicability, and at the same time, has good noise reduction effect.

[0049] Furthermore, the aluminum foam sheet 20 is composed of 42% aluminum, 35% nickel, 6% copper, and 17% fiber. The tensile strength of the aluminum foam sheet 20 of this material reaches 12 Mpa, the compressive strength ≥ 95 KPa, the mechanical strength reaches 2.5 Mpa, it is heat-resistant and can withstand high temperatures above 850 °C. It is suitable for the use environment of PH 3.0 - PH 10 and has good acid and alkali tolerance performance. Applying this material inside the valve barrel 30 will not cause physical or chemical effects on the working medium, is corrosion-resistant and impact-resistant, is easy to process on-site, is easy to fold and bend, is economical and practical, and has low transformation cost.

[0050] In summary, the embodiment of the present invention provides a noise reduction device for a gas pressure regulating equipment. When the gas transported by the intake pipe 11 passes through the aluminum foam sheet 20 installed at the valve port, the small holes 23 with a diameter of 0.2 - 1.5 mm on the aluminum foam sheet 20 inject the air flow through the small holes 23, thereby changing the original air flow movement direction. By using the gas to be transported from the valve barrel 30 through the aluminum foam sheet 20 outward, the frequency spectrum of the jet noise will shift from low frequency to multiple frequency bands, significantly reducing the audible sound component in the frequency spectrum, thereby reducing the interference to people and further achieving the purpose of eliminating noise. The small holes 23 with a diameter of 0.2 - 1.5 mm and the porosity on the aluminum foam sheet 20 are set at 60 - 80%, which can not only ensure that the pressure loss is not significantly reduced but also effectively reduce noise.

[0051] An embodiment of the present invention provides a gas pressure regulating device. The noise source of the gas pressure regulating device mainly generates at valve 10. Since during the pressure reduction process of the gas flow, the sharp change in the flow velocity causes the gas flow to violently impact the inner wall of the valve port inside, generating low-frequency noise. According to the causes and characteristics of the noise generation, the aluminum foam sheet 20 is placed inside one end of the valve barrel 30 provided with a valve port. When the gas transported by the intake pipe 11 passes through the aluminum foam sheet 20 installed at the valve port, the small holes 23 on the aluminum foam sheet 20 perform small hole injection on the gas flow, thereby changing the original gas flow movement direction. By using the gas to be transported from inside the valve barrel 30 through the aluminum foam sheet 20 to the outside, the frequency spectrum of the jet noise will shift from low frequency to multiple frequency bands, significantly reducing the audible sound component in the frequency spectrum, thereby reducing the interference to people and further achieving the purpose of eliminating noise.

[0052] An embodiment of the present invention provides a noise reduction method for a gas pressure regulating device. The aluminum foam sheet 20 is easy to process, can be adjusted in size and specifications according to the valve port size of the on-site equipment, is light in weight and convenient to carry. After cutting the aluminum foam sheet 20, a ring-shaped aluminum foam body 22 is prepared by welding. The valve cover 40 is used to support and fix the ring-shaped aluminum foam body 22, so that the ring-shaped aluminum foam body 22 can completely enter the valve barrel 30 and closely adhere to the inner wall of the valve barrel 30 at the valve port. It is simple to manufacture and has wide applicability. At the same time, the noise reduction effect is good.

[0053] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present invention, several improvements and substitutions can still be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A noise reduction device for a gas pressure regulating device, characterized in that: it includes an aluminum foam sheet built into the valve barrel and a valve cover for covering the valve barrel, the aluminum foam sheet is connected to the valve cover, the porosity of the aluminum foam sheet is set at 60% - 85%, and the pore diameter of the aluminum foam sheet is set at 0.2 mm - 1.5 mm; the aluminum foam sheet includes a first side and a second side, the first side and the second side are connected to form an annular aluminum foam body, the inner wall of the annular aluminum foam body forms a gas collection cavity, and the first side and the second side of the aluminum foam sheet are welded to form a weld; the thickness of the aluminum foam sheet is set at 3 mm - 5 mm.

2. A gas pressure regulating device, characterized in that: it includes a valve, the valve is provided with a valve barrel, one end of the valve barrel is provided with a valve port, the valve port is covered with a valve cover, a side of the valve cover facing the valve port is connected with an aluminum foam sheet, and the aluminum foam sheet is built into one end of the valve barrel where the valve port is provided; the pore diameter of the aluminum foam sheet is set at 0.2 mm - 1.5 mm; the porosity of the aluminum foam sheet is set at 60% - 85%; the aluminum foam sheet includes a first side and a second side, the first side and the second side are connected to form an annular aluminum foam body, the inner wall of the annular aluminum foam body forms a gas collection cavity, and the first side and the second side of the aluminum foam sheet are welded to form a weld.

3. The gas pressure regulating device according to claim 2, characterized in that: the valve is provided with an inlet pipe communicated with the valve barrel and an outlet pipe communicated with the valve barrel, the inlet pipe and the outlet pipe are respectively located on both sides of the valve barrel, the inlet pipe is located above the valve barrel, the inlet pipe is communicated with the gas collection cavity, and the outlet pipe is located on one side of the annular aluminum foam body.

4. A noise reduction method for a gas pressure regulating device, applied to the gas pressure regulating device according to claim 2, characterized in that: it includes the following steps: Step 1: Produce an aluminum foam sheet by a foaming process, control the porosity of the aluminum foam sheet at 60% - 85%, and control the pore diameter range of the aluminum foam sheet at 0.2 mm - 1.5 mm; Step 2: Cut the aluminum foam sheet according to the size of the valve barrel of the pressure regulating device valve, weld the two ends of the aluminum foam sheet to form an annular aluminum foam body, the valve barrel is covered with a valve cover, place the annular aluminum foam body on the top surface of the valve cover, and push the annular aluminum foam body into the valve barrel through the valve cover so that the outer contour of the annular aluminum foam body abuts against the inner wall of the valve barrel, and the valve cover is installed on the valve barrel.

5. The noise reduction method for a gas pressure regulating device according to claim 4, characterized in that: the aluminum foam sheet is composed of 42% aluminum, 35% nickel, 6% copper and 17% fiber.

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