CN216112469U - Gas pressure regulating equipment and noise reduction device - Google Patents
Gas pressure regulating equipment and noise reduction device Download PDFInfo
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- CN216112469U CN216112469U CN202121465846.4U CN202121465846U CN216112469U CN 216112469 U CN216112469 U CN 216112469U CN 202121465846 U CN202121465846 U CN 202121465846U CN 216112469 U CN216112469 U CN 216112469U
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- foamed aluminum
- aluminum sheet
- pressure regulating
- gas pressure
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 43
- 230000009467 reduction Effects 0.000 title claims abstract description 27
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 111
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 111
- 239000011148 porous material Substances 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 45
- 239000006260 foam Substances 0.000 description 33
- 238000001228 spectrum Methods 0.000 description 12
- 230000008859 change Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 239000002737 fuel gas Substances 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000011946 reduction process Methods 0.000 description 4
- 229920000742 Cotton Polymers 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000030279 gene silencing Effects 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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Abstract
The utility model relates to the technical field of gas equipment, and discloses gas pressure regulating equipment and a noise reduction device, which comprise a foamed aluminum sheet arranged in a valve cylinder and a valve cover used for covering the valve cylinder, wherein the foamed aluminum sheet is connected with the valve cover, the porosity of the foamed aluminum sheet is set to be 60-85%, and the pore diameter of the foamed aluminum sheet is set to be 0.2-1.5 mm. The gas pressure regulating equipment and the noise reduction device are easy to process, reduce the noise of the valve port, have low noise reduction cost, simple manufacture and wide applicability.
Description
Technical Field
The utility model relates to the technical field of gas equipment, in particular to gas pressure regulating equipment and a noise reduction device.
Background
The gas pressure regulating device plays a role in reducing high-pressure airflow to low-pressure airflow in the gas transmission and distribution process, and has a function similar to that of a power transformer. However, in the process of reducing the pressure of the air flow, the air flow changes rapidly, so that the air flow can violently impact the inner wall of the pressure regulating device to generate low-frequency noise. The noise is easy to cause discomfort, and can cause the operation noise of the pressure regulating equipment to exceed the national allowable environmental protection standard, thereby causing complaints of residents. Along with the development of users, the consumption of natural gas is gradually increased, the early low-load operation of some pressure regulating devices is changed into high-load operation, and the problem of noise of the pressure regulating devices is increasingly prominent. Therefore, how to effectively solve the problem and reduce the customer complaints becomes an urgent need of each gas enterprise at present.
At present, the noise reduction measures for the pressure regulating equipment mainly comprise the following two modes: firstly, sound insulation materials are laid on a shell of the equipment to block noise transmission, and the sound insulation materials generally adopt common sound absorption cotton; and secondly, replacing the pressure regulating equipment with larger flow.
SUMMERY OF THE UTILITY MODEL
The first object of the present invention is: the utility model provides an easy processing and noise reduction device who reduces valve port noise.
The second object of the present invention is: the gas pressure regulating device is small in valve port noise and low in noise reduction cost.
In order to achieve the purpose, the utility model provides a noise reduction device of gas pressure regulating equipment, which comprises an aluminum foam sheet arranged in a valve cylinder and a valve cover used for covering the valve cylinder, wherein the aluminum foam sheet is connected with the valve cover, the porosity of the aluminum foam sheet is set to be 60-85%, and the pore diameter of the aluminum foam sheet is set to be 0.2-1.5 mm.
Preferably, the foamed aluminum sheet comprises a first side edge and a second side edge, the first side edge and the second side edge are connected to form an annular foamed aluminum body, and a gas collecting cavity is formed in the inner wall of the annular foamed aluminum body.
Preferably, the thickness of the foamed aluminum sheet is set to be 3mm-5 mm.
The gas pressure regulating device comprises a valve, wherein the valve is provided with a valve cylinder, a valve port is formed in one end of the valve cylinder, a valve cover is arranged on the valve port cover, one side, facing the valve port, of the valve cover is connected with a foamed aluminum sheet, and the foamed aluminum sheet is arranged in the valve cylinder and provided with one end of the valve port.
Preferably, the pore diameter of the foamed aluminum sheet is set to be 0.2-1.5 mm.
Preferably, the porosity of the foamed aluminum sheet is set to be 60-85%.
Preferably, the foamed aluminum sheet comprises a first side edge and a second side edge, the first side edge and the second side edge are connected to form an annular foamed aluminum body, and a gas collecting cavity is formed in the inner wall of the annular foamed aluminum body.
Preferably, the valve is provided with an air inlet pipe communicated with the valve cylinder and an air outlet pipe communicated with the valve cylinder, the air inlet pipe and the air outlet pipe are respectively positioned on two sides of the valve cylinder, the air inlet pipe is positioned above the valve cylinder, the air inlet pipe is communicated with the gas collecting cavity, and the air outlet pipe is positioned on one side of the annular foamed aluminum body.
Compared with the prior art, the noise reduction device of the gas pressure regulating equipment has the beneficial effects that: when the gas delivered from the gas inlet pipe passes through the foamed aluminum sheet arranged at the valve port, the pores with the porosity of 0.2-1.5mm on the 60-85% foamed aluminum sheet carry out small-pore injection on the airflow so as to change the movement direction of the original airflow. The gas is conveyed outwards from the valve cylinder through the foamed aluminum sheet, the frequency spectrum of the jet noise can be shifted from the low frequency to a plurality of frequency bands, and audible components in the frequency spectrum are obviously reduced, so that the interference to people is reduced, and the purpose of eliminating the noise is further achieved.
Compared with the prior art, the gas pressure regulating device provided by the embodiment of the utility model has the beneficial effects that: the noise source of the gas pressure regulating equipment is mainly generated at the valve, and the airflow can violently impact the inner wall of the valve port to generate low-frequency noise due to the rapid change of the flow speed in the pressure reduction process of the airflow. According to the reason and the characteristic that the noise produced, with the foam aluminum sheet through the one end of placing the valve barrel in and being equipped with the valve port in, when the gas that is carried over by the admission line is through the foam aluminum sheet of installing in valve port department, thereby the aperture on the foam aluminum sheet carries out the aperture with the air current and spouts the change former air current direction of motion, utilize gas to carry out outside through the foam aluminum sheet in the valve barrel, the frequency spectrum of jet noise can be followed the low frequency and moved to a plurality of frequency channels and shifted, make the audible sound composition in the frequency spectrum obviously reduce, thereby reduce the interference to the people, and then reach the mesh of noise elimination.
Drawings
Fig. 1 is a schematic view of the overall structure of the embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an aluminum foam sheet according to an embodiment of the present invention.
FIG. 3 is a schematic structural view of an annular aluminum foam body according to an embodiment of the present invention.
In the figure:
10. a valve; 11. an air inlet pipe; 12. an air outlet pipe; 13. welding seams;
20. foamed aluminum sheet; 21. a gas collection chamber; 22. an annular foamed aluminum body; 23. a small hole;
30. a valve barrel;
40. and a valve cover.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. used herein are used to indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the terms "connected," "fixed," and the like are used in a broad sense, and for example, the terms "connected," "connected," and "fixed" may be fixed, detachable, or integrated; the connection can be mechanical connection or welding connection; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1 to 3, the noise reduction device of a gas pressure regulating apparatus according to a preferred embodiment of the present invention includes an aluminum foam sheet 20 disposed in a valve cylinder 30 and a valve cover 40 for covering the valve cylinder 30, the aluminum foam sheet 20 is connected to the valve cover 40, the porosity of the aluminum foam sheet 20 is set to 60-85%, and the pore diameter of the aluminum foam sheet 20 is set to 0.2-1.5 mm.
According to the noise reduction device of the gas pressure regulating equipment, theoretical analysis and equipment verification show that the noise source of the gas pressure regulating equipment is mainly generated at the valve port. The reason is that the air flow can violently impact the inner wall of the valve port to generate low-frequency noise due to the rapid change of the flow speed in the pressure reduction process of the air flow. According to the reason and the characteristic of noise generation, the foamed aluminum sheet 20 is arranged at the valve port, when the fuel gas conveyed from the air inlet pipe 11 passes through the foamed aluminum sheet 20 arranged at the valve port, the small holes 23 with the diameter of 0.2-1.5mm on the foamed aluminum sheet 20 spray the airflow through the small holes 23, so that the moving direction of the original airflow is changed. By utilizing the gas to be conveyed from the valve cylinder 30 to the outside through the foamed aluminum sheet 20, the frequency spectrum of the jet noise can be shifted from low frequency to a plurality of frequency bands, so that the audible sound component in the frequency spectrum is obviously reduced, the interference to people is reduced, and the purpose of eliminating the noise is further achieved. The foamed aluminum sheet 20 can be cut according to the size of the valve port of the pressure regulating device, and simultaneously, the gas pressure regulating deviceThe sizes of the valve ports are not uniform, and a shaped product is difficult to produce so as to meet the general requirements. The foamed aluminum sheet 20 has the characteristic of easy processing, can be automatically adjusted in size and specification according to the size of a valve port of field equipment, and is light in weight and convenient to carry.
| Pore size range (mm) | Pressure loss (pa) | Noise reduction effect (dB) |
| Less than 0.2 | Greater than 100 | 15-25 |
| 0.2-1.5 | 50-100 | 10-15 |
| Greater than 1.5 | Less than 50 | Less than 10 |
Table 1 is a table of pore size experimental data.
As shown in Table 1, the small holes 23 of 0.2-1.5mm in the foamed aluminum sheet 20 can not only ensure that the pressure loss is not greatly reduced, but also effectively reduce the noise. The porosity exceeds 80%, and the pressure loss for fluid circulation is too large, so that the transmission and distribution performance is influenced; less than 60%, the noise reduction effect is not significant, and thus the porosity of the foamed aluminum sheet 20 is 60-80% in an optimal proportion. The valve cover 40 is used for supporting the foamed aluminum sheet 20, and meanwhile, the foamed aluminum sheet 20 is convenient to mount, so that the foamed aluminum sheet 20 is prevented from deforming when being mounted, and the noise reduction effect is prevented from being influenced. The noise reduction device can avoid the situation that the whole pressure regulating equipment is additionally provided with silencing cotton or the pressure regulating equipment is replaced, reduces the workload and has good economic benefit.
Further, as shown in fig. 2, 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 an inner wall of the annular aluminum foam body 22 forms the gas collection chamber 21. The circular smooth surface in annular foam aluminum body 22 outside, the lateral surface of annular foam aluminum body 22 supports and pastes in the inner wall of valve barrel 30 near the valve port, makes the air current in the gas pipeline concentrate and gets into in the gas collection chamber 21 and realize the amortization through aperture 23 on the foam aluminum sheet 20, avoids producing the noise regeneration between foam aluminum sheet 20 and the valve barrel 30 wall, and noise reduction effect is good.
Further, as shown in fig. 2 to 3, the aluminum foam sheet 20 has an excessively small thickness, and has insufficient support strength and low tensile strength due to the impact of natural gas on the aluminum foam sheet 20 in the valve cylinder 30. The foamed aluminum sheet 20 has too large thickness to be bent manually, and the foamed aluminum sheet 20 cannot be put into the valve opening of the equipment. The thickness of the foamed aluminum sheet 20 is set to be 3mm-5mm, so that the requirements of supporting strength and tensile strength are met, and meanwhile, the foamed aluminum sheet is conveniently placed into the valve cylinder 30 after being manually processed.
As shown in fig. 1 to 3, a gas pressure regulating device comprises a valve 10, wherein the valve 10 is provided with a valve cylinder 30, one end of the valve cylinder 30 is provided with a valve port, the valve port cover is provided with a valve cover 40, one side of the valve cover 40 facing the valve port is connected with a foamed aluminum sheet 20, and the foamed aluminum sheet 20 is arranged in one end of the valve cylinder 30 provided with the valve port.
According to the gas pressure regulating device, theoretical analysis and device verification show that the noise source of the gas pressure regulating device is mainly generated at the valve 10, and the gas flow can violently impact the inner wall of the valve port to generate low-frequency noise due to the rapid change of the flow speed in the pressure reduction process of the gas flow. According to the reason and the characteristic of noise generation, the foamed aluminum sheet 20 is arranged at one end of the valve cylinder 30, which is provided with a valve port, through the built-in foamed aluminum sheet 20, when the fuel gas conveyed from the air inlet pipe 11 passes through the foamed aluminum sheet 20 arranged at the valve port, the small holes 23 on the foamed aluminum sheet 20 inject the airflow to change the moving direction of the original airflow, the gas is conveyed outwards from the valve cylinder 30 through the foamed aluminum sheet 20, the frequency spectrum of the air injection noise can be shifted from low frequency to multiple frequency bands, audible sound components in the frequency spectrum are obviously reduced, the interference to people is reduced, and the purpose of eliminating the noise is further achieved. The foamed aluminum sheet 20 can be cut according to the size of the valve port of the pressure regulating device, and meanwhile, because the size of the valve port of the gas pressure regulating device is not uniform, a shaped product is difficult to produce so as to meet the general requirement. The foamed aluminum sheet 20 has the characteristic of easy processing, can be automatically adjusted in size and specification according to the size of a valve port of field equipment, and is light in weight and convenient to carry. The valve cover 40 is used for supporting the foamed aluminum sheet 20, and meanwhile, the foamed aluminum sheet 20 is convenient to mount, so that the foamed aluminum sheet 20 is prevented from deforming when being mounted, and the noise reduction effect is prevented from being influenced. The noise reduction device can avoid the situation that the whole pressure regulating equipment is additionally provided with silencing cotton or the pressure regulating equipment is replaced, reduces the workload and has good economic benefit.
When the noise reducer of the utility model is not installed on the valve cylinder 30, the decibel value of sound at 1 meter of the diameter range of the valve cylinder 30 is 67.81-70.10, and when the noise reducer of the utility model is installed, the decibel value of sound at 1 meter of the diameter range of the valve cylinder 30 is 51.33-54.43. As can be seen from the data comparison, the noise is obviously reduced after the noise reduction device is installed.
Further, as shown in fig. 1 to 3, the aperture of the foamed aluminum sheet 20 is set to be 0.2-1.5mm, and the small holes 23 of 0.2-1.5mm on the foamed aluminum sheet 20 can not only ensure that the pressure loss is not greatly reduced, but also can effectively reduce noise.
Further, as shown in fig. 1 to 3, the porosity of the foamed aluminum sheet 20 is set at 60% to 85%. The porosity exceeds 80%, and the pressure loss for fluid circulation is too large, so that the transmission and distribution performance is influenced; less than 60%, the noise reduction effect is not obvious, so the porosity of the foamed aluminum sheet 20 of 60-80% is the best proportion for noise reduction in the valve cylinder 30 installed in the gas equipment.
Further, as shown in fig. 2, 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 an inner wall of the annular aluminum foam body 22 forms the gas collection chamber 21. The circular shape smooth surface in annular foam aluminum body 22 outside, the lateral surface of annular foam aluminum body 22 supports and pastes in the valve port inner wall, makes the air current in the gas pipeline concentrate and gets into in the gas collection chamber 21 and realize the amortization through aperture 23 on the foam aluminum sheet 20, avoids producing the noise regeneration between foam aluminum sheet 20 and the valve port, and noise reduction effect is good. Specifically, the outer contour of the annular aluminum foam body 22 abuts against the inner wall of the valve cylinder 30, so that the annular aluminum foam body 22 fills the valve cylinder 30, and a better sound attenuation effect is achieved. The first and second sides of the aluminum foam sheet 20 are welded to form a weld 13.
Further, as shown in fig. 1, the valve 10 is provided with an air inlet pipe 11 communicated with the valve cylinder 30 and an air outlet pipe 12 communicated with the valve cylinder 30, the air inlet pipe 11 and the air outlet pipe 12 are respectively located at two sides of the valve cylinder 30, the air inlet pipe 11 is located above the valve cylinder 30, the air inlet pipe 11 is communicated with the gas collecting cavity 21, and the air outlet pipe 12 is located at one side of the annular foamed aluminum body 22.
In summary, the embodiment of the present invention provides a noise reduction device for a gas pressure regulating device, when gas delivered from an air inlet pipe 11 passes through a foamed aluminum sheet 20 installed at a valve port, small holes 23 of 0.2-1.5mm on the foamed aluminum sheet 20 inject air flow through the small holes 23, so as to change the moving direction of the original air flow. By utilizing the gas to be conveyed from the valve cylinder 30 to the outside through the foamed aluminum sheet 20, the frequency spectrum of the jet noise can be shifted from low frequency to a plurality of frequency bands, so that the audible sound component in the frequency spectrum is obviously reduced, the interference to people is reduced, and the purpose of eliminating the noise is further achieved. The small holes 23 with the diameter of 0.2-1.5mm and the porosity on the foamed aluminum sheet 20 are set to be 60-80 percent, so that the pressure loss is not greatly reduced, and the noise can be effectively reduced.
The embodiment of the utility model provides a fuel gas pressure regulating device, wherein a noise source of the fuel gas pressure regulating device is mainly generated at a valve 10, and the airflow can violently impact the inner wall of a valve port to generate low-frequency noise due to the rapid change of the flow speed in the pressure reduction process of the airflow. According to the reason and the characteristic of noise generation, the foamed aluminum sheet 20 is arranged at one end of the valve cylinder 30, which is provided with a valve port, through the built-in foamed aluminum sheet 20, when the fuel gas conveyed from the air inlet pipe 11 passes through the foamed aluminum sheet 20 arranged at the valve port, the small holes 23 on the foamed aluminum sheet 20 inject the airflow to change the moving direction of the original airflow, the gas is conveyed outwards from the valve cylinder 30 through the foamed aluminum sheet 20, the frequency spectrum of the air injection noise can be shifted from low frequency to multiple frequency bands, audible sound components in the frequency spectrum are obviously reduced, the interference to people is reduced, and the purpose of eliminating the noise is further achieved.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (8)
1. The utility model provides a device of making an uproar falls in gas pressure regulating equipment which characterized in that: the valve comprises a foamed aluminum sheet arranged in a valve barrel and a valve cover used for covering the valve barrel, wherein the foamed aluminum sheet is connected with the valve cover, the porosity of the foamed aluminum sheet is set to be 60-85%, and the aperture of the foamed aluminum sheet is set to be 0.2-1.5 mm.
2. The noise reduction device of a gas pressure regulating apparatus according to claim 1, characterized in that: the foamed aluminum sheet includes first side and second side, first side with the second side is connected and is formed annular foamed aluminum body, the inner wall of annular foamed aluminum body forms gas collection chamber.
3. The noise reduction device of a gas pressure regulating apparatus according to claim 1, characterized in that: the thickness of the foamed aluminum sheet is set to be 3mm-5 mm.
4. A gas pressure regulating device, its characterized in that: the valve comprises a valve, wherein the valve is provided with a valve cylinder, one end of the valve cylinder is provided with a valve port, the valve port cover is provided with a valve cover, one side of the valve cover, facing the valve port, is connected with a foamed aluminum sheet, and the foamed aluminum sheet is arranged in the end, provided with the valve port, of the valve cylinder.
5. The gas pressure regulating device according to claim 4, characterized in that: the aperture of the foamed aluminum sheet is set to be 0.2-1.5 mm.
6. The gas pressure regulating device according to claim 4, characterized in that: the porosity of the foamed aluminum sheet is set to be 60-85%.
7. The gas pressure regulating device according to claim 4, characterized in that: the foamed aluminum sheet includes first side and second side, first side with the second side is connected and is formed annular foamed aluminum body, the inner wall of annular foamed aluminum body forms gas collection chamber.
8. The gas pressure regulating device according to claim 7, characterized in that: the valve is provided with an air inlet pipe communicated with the valve cylinder and an air outlet pipe communicated with the valve cylinder, the air inlet pipe and the air outlet pipe are respectively positioned at two sides of the valve cylinder, the air inlet pipe is positioned above the valve cylinder, the air inlet pipe is communicated with the gas collecting cavity, and the air outlet pipe is positioned at one side of the annular foamed aluminum body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121465846.4U CN216112469U (en) | 2021-06-29 | 2021-06-29 | Gas pressure regulating equipment and noise reduction device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121465846.4U CN216112469U (en) | 2021-06-29 | 2021-06-29 | Gas pressure regulating equipment and noise reduction device |
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| Publication Number | Publication Date |
|---|---|
| CN216112469U true CN216112469U (en) | 2022-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121465846.4U Active CN216112469U (en) | 2021-06-29 | 2021-06-29 | Gas pressure regulating equipment and noise reduction device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113374927A (en) * | 2021-06-29 | 2021-09-10 | 广州燃气集团有限公司 | Gas pressure regulating equipment, noise reduction device and noise reduction method |
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2021
- 2021-06-29 CN CN202121465846.4U patent/CN216112469U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113374927A (en) * | 2021-06-29 | 2021-09-10 | 广州燃气集团有限公司 | Gas pressure regulating equipment, noise reduction device and noise reduction method |
| CN113374927B (en) * | 2021-06-29 | 2025-06-10 | 广州燃气集团有限公司 | Gas pressure regulating equipment, noise reduction device and noise reduction method |
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