CN114396523B - Active and passive composite muffler for liquid filling pipeline - Google Patents
Active and passive composite muffler for liquid filling pipeline Download PDFInfo
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- CN114396523B CN114396523B CN202210176737.3A CN202210176737A CN114396523B CN 114396523 B CN114396523 B CN 114396523B CN 202210176737 A CN202210176737 A CN 202210176737A CN 114396523 B CN114396523 B CN 114396523B
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- pipeline
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- cavity
- muffler
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- 239000007788 liquid Substances 0.000 title claims abstract description 55
- 239000002131 composite material Substances 0.000 title claims abstract description 26
- 230000030279 gene silencing Effects 0.000 claims abstract description 36
- 239000000919 ceramic Substances 0.000 claims abstract description 33
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000001228 spectrum Methods 0.000 abstract description 19
- 230000008030 elimination Effects 0.000 description 11
- 238000003379 elimination reaction Methods 0.000 description 11
- 230000010349 pulsation Effects 0.000 description 9
- 238000013016 damping Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000033001 locomotion Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000001743 silencing effect Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003584 silencer Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/033—Noise absorbers
- F16L55/0333—Noise absorbers by means of an active system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/027—Throttle passages
- F16L55/02754—Throttle passages using a central core throttling the passage
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Exhaust Silencers (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses an active and passive composite muffler for a liquid filling pipeline, and belongs to the technical field of mufflers. The muffler includes a housing assembly, a first muffler assembly, and a second muffler assembly. The shell assembly comprises a shell, a first pipeline and a second pipeline, wherein an expansion cavity and at least one silencing cavity are formed in the shell, and the first end of the silencing cavity is communicated with the second pipeline. The first silencing assembly comprises a third pipeline which is inserted into the expansion cavity, and a plurality of small holes communicated with the expansion cavity are formed in the circumferential direction of the third pipeline. The second silencing component comprises a controller and a control unit, the control unit comprises a valve core and piezoelectric ceramics, the controller is electrically connected with the piezoelectric ceramics, the valve core is movably inserted in the silencing cavity, the piezoelectric ceramics are located in the silencing cavity, and the piezoelectric ceramics are in transmission fit with the valve core. The active and passive composite muffler for the liquid filling pipeline provided by the embodiment of the invention meets the control requirements of low-frequency line spectrum noise and medium-high frequency broadband noise in the liquid filling pipeline.
Description
Technical Field
The invention belongs to the technical field of silencers, and particularly relates to an active and passive composite silencer for a liquid filling pipeline.
Background
The pipeline system has very important application in various industrial fields, particularly in the field of ship industry, and a liquid filling pipeline is commonly existing in various ships and plays an important role.
The liquid in the liquid filled line may transmit pulsation noise during the flow. The actual measurement result shows that most pipeline pulsation noise contains low-frequency line spectrum noise components and medium-high frequency broadband noise components, the control difficulty is high, and the pipeline pulsation noise is a weak link for noise control of water vehicles, operation platforms and the like.
However, the existing muffler is difficult to simultaneously meet the control requirements of low-frequency line spectrum noise and medium-high frequency broadband noise in a liquid filling pipeline.
Disclosure of Invention
Aiming at the defects or improvement demands of the prior art, the invention provides the active and passive composite muffler for the liquid filling pipeline, which aims to realize the combination of passive noise elimination and active noise elimination, thereby meeting the control requirements of the liquid filling pipeline on low-frequency line spectrum noise and medium-high frequency broadband noise and achieving the final noise elimination effect.
The invention provides an active and passive composite muffler for a liquid filling pipeline, which comprises a shell assembly, a first silencing assembly and a second silencing assembly;
the shell assembly comprises a shell, a first pipeline and a second pipeline, wherein an expansion cavity and at least one silencing cavity are formed in the shell, the first pipeline and the second pipeline are coaxially arranged, the first pipeline and the second pipeline are respectively inserted into two ends of the shell, and the first end of the silencing cavity is communicated with the second pipeline;
The first silencing assembly comprises a third pipeline, the third pipeline is inserted into the expansion cavity, the outer diameter of the third pipeline is smaller than the inner diameter of the expansion cavity, two ends of the third pipeline are respectively and coaxially communicated with the first pipeline and the second pipeline, and a plurality of small holes communicated with the expansion cavity are formed in the circumferential direction of the third pipeline;
The second silencing component comprises a controller and a control unit, the control unit comprises a valve core and piezoelectric ceramics, the controller is electrically connected with the piezoelectric ceramics, the valve core is movably inserted into the silencing cavity, the piezoelectric ceramics are located in the silencing cavity, and the piezoelectric ceramics are in transmission fit with the valve core so as to push the valve core to move.
Optionally, the control unit further comprises a push rod, the push rod is slidably inserted into the sound-absorbing cavity, and two ends of the push rod are respectively in transmission connection with the piezoelectric ceramics and the valve core.
Optionally, the shell includes first shell, second shell and the third shell that arranges in proper order, first shell the second shell with third shell detachably connects, expansion chamber and noise elimination chamber are located in the second shell, first pipeline cartridge is in the first shell, just the first end of first pipeline stretches out first shell, third pipeline cartridge is in the second shell, the second pipeline cartridge is in the third shell, just the first end of second pipeline stretches out the third shell.
Optionally, the second end of the first pipe and the peripheral wall of the second end of the second pipe are each externally threaded.
Optionally, a fastening bolt is inserted on the first shell, a first end of the fastening bolt is in threaded fit with a second end of the sound-absorbing cavity, and the piezoelectric ceramic abuts against the first end of the fastening bolt.
Optionally, a plurality of connecting bolts are inserted on the third housing to connect the third housing and the second housing.
Optionally, the control unit further comprises a noise sensor and a computer, the noise sensor is located in the first pipeline, and the noise sensor, the computer and the controller are electrically connected in sequence.
Optionally, the number of the control units and the number of the silencing cavities are multiple, and the control units and the silencing cavities are in one-to-one correspondence.
Optionally, the diameter of the small holes is 1-2mm, and the distance between two adjacent small holes is 2-5mm.
Optionally, sealing rings are respectively arranged between the first pipeline and the third pipeline and between the second pipeline and the third pipeline.
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
When the active and passive composite muffler for the liquid filling pipeline provided by the embodiment of the invention is used for silencing the liquid filling pipeline, the right end of the first pipeline and the left end of the second pipeline are respectively communicated with the liquid filling pipeline in advance, so that the muffler is arranged at any position in the liquid filling pipeline. The liquid in the liquid filling pipeline flows in from the first pipeline and flows out through the third pipeline and the second pipeline in sequence. On the one hand, when the liquid passes through the third pipeline, the liquid flows into the expansion cavity through the small hole, the flowing state of the liquid is changed, and the silencing of the medium-high frequency band broadband noise can be realized according to the Helmholtz resonance principle and the viscous loss principle of the fluid medium in the micropore (the process is regarded as passive silencing). In the second aspect, according to low-frequency line spectrum noise in the liquid filling pipeline, the controller controls the piezoelectric ceramics to generate corresponding deformation, so that the valve core is pushed to move. Because the silencing cavity is communicated with the second pipeline, pulsation noise can be generated in the motion process of the valve core, and thus the pulsation noise can be counteracted with low-frequency line spectrum noise in the liquid filling pipeline (namely, counter noise is provided to counteract the original low-frequency line spectrum noise in the liquid filling pipeline), and the silencing effect of the low-frequency line spectrum noise is achieved (the process is regarded as active silencing).
That is, the active-passive composite muffler for the liquid filling pipeline provided by the embodiment of the invention can realize the integration of passive noise elimination and active noise elimination, thereby meeting the control requirements of low-frequency line spectrum noise and medium-high frequency broadband noise in the liquid filling pipeline and achieving the final noise elimination effect.
Drawings
FIG. 1 is a schematic view of a structure of a passive and active composite muffler for a charging line according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a passive and active composite muffler for a charge line according to an embodiment of the present invention;
Fig. 3 is an exploded schematic view of a passive and active composite muffler for a liquid filled line according to an embodiment of the present invention.
The symbols in the drawings are as follows:
1. A housing assembly; 11. a housing; 111. expanding the cavity; 112. an acoustic cavity; 113. a first housing; 1131. a fastening bolt; 114. a second housing; 115. a third housing; 1151. a connecting bolt; 1152. a communication hole; 12. a first pipe; 13. a second pipe; 2. a first muffler assembly; 21. a third conduit; 211. a small hole; 3. a second muffler assembly; 31. a control unit; 311. a valve core; 312. piezoelectric ceramics; 313. a push rod; 4. and (3) sealing rings.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Fig. 1 is a schematic structural view of a passive and active composite muffler for a liquid filling pipe according to an embodiment of the present invention, fig. 2 is a cross-sectional view of a passive and active composite muffler for a liquid filling pipe according to an embodiment of the present invention, and fig. 3 is an exploded schematic view of a passive and active composite muffler for a liquid filling pipe according to an embodiment of the present invention, and the muffler includes a housing assembly 1, a first muffler assembly 2, and a second muffler assembly 3, as shown in fig. 1, 2, and 3.
The housing assembly 1 comprises a housing 11, a first pipe 12 and a second pipe 13, wherein an expansion cavity 111 and at least one silencing cavity 112 are formed in the housing 11, the first pipe 12 and the second pipe 13 are coaxially arranged, the first pipe 12 and the second pipe 13 are respectively inserted into two ends of the housing 11 and extend out of the housing 11, and a first end of the silencing cavity 112 is communicated with the second pipe 13.
The first muffler assembly 2 includes a third pipe 21, the third pipe 21 is inserted in the expansion chamber 111, the outer diameter of the third pipe 21 is smaller than the inner diameter of the expansion chamber 111, two ends of the third pipe 21 are respectively and coaxially communicated with the first pipe 12 and the second pipe 13, and a plurality of small holes 211 communicated with the expansion chamber 111 are formed in the circumferential direction of the third pipe 21.
The second muffler assembly 3 includes a controller (not shown) and a control unit 31, the control unit 31 includes a valve core 311 and a piezoelectric ceramic 312, the controller is electrically connected with the piezoelectric ceramic 312, the valve core 311 is movably inserted in the muffler cavity 112, the piezoelectric ceramic 312 is located in the muffler cavity 112, and the piezoelectric ceramic 312 and the valve core 311 are in transmission fit to push the valve core 311 to move.
For the active-passive composite muffler for the liquid filling pipeline, when the liquid filling pipeline is muffled, the right end of the first pipeline 12 and the left end of the second pipeline 13 are respectively communicated with the liquid filling pipeline in advance, so that the muffler is arranged at any position in the liquid filling pipeline. The liquid in the charging line flows in from the first conduit 12 and out through the third conduit 21 and the second conduit 13 in sequence. On the other hand, when the liquid passes through the third pipe 21, the liquid flows into the expansion chamber 111 through the small hole 211, the flowing state of the liquid changes, and the silencing of the medium-high frequency band broadband noise can be realized according to the helmholtz resonance principle and the viscous loss principle of the fluid medium in the micropores (the process is regarded as passive silencing). In the second aspect, according to the low-frequency line spectrum noise in the liquid filling pipeline, the controller controls the piezoelectric ceramic 312 to generate corresponding deformation, so as to push the valve core 311 to move. Because the silencing cavity 112 is communicated with the second pipeline 13, pulsation noise is generated in the motion process of the valve core 311, so that the pulsation noise can be counteracted with the low-frequency line spectrum noise in the liquid filling pipeline (namely, anti-noise is provided to counteract the original low-frequency line spectrum noise in the liquid filling pipeline), and the silencing effect of the low-frequency line spectrum noise is achieved (the process is regarded as active silencing).
That is, the active-passive composite muffler for the liquid filling pipeline provided by the embodiment of the invention can realize the integration of passive noise elimination and active noise elimination, thereby meeting the control requirements of low-frequency line spectrum noise and medium-high frequency broadband noise in the liquid filling pipeline and achieving the final noise elimination effect.
It should be noted that, the piezoelectric ceramic 312 is disposed in the sound-damping cavity 112, so that not only can the liquid in the liquid-filled pipeline be prevented from corroding the piezoelectric ceramic 312, but also the valve core 311 can be directly acted, and on the basis of the communication between the sound-damping cavity 112 and the second pipeline 13, the valve core 311 directly generates motion to efficiently generate corresponding anti-noise, so that the manner (low efficiency) that the piezoelectric ceramic 312 is used for acting on the walls of the first pipeline 12, the second pipeline 13 or the third pipeline 21 to generate poor deformation to form the anti-noise is avoided.
With continued reference to fig. 2, the control unit 31 further includes a push rod 313, the push rod 313 is slidably inserted in the sound-damping cavity 112, and two ends of the push rod 313 are respectively in driving connection with the piezoelectric ceramics 312 and the valve core 311.
In the above embodiment, the push rod 313 plays a role of connecting the piezoelectric ceramic 312 and the valve element 311 in a driving manner, so that the movement of the valve element 311 is more stable.
Illustratively, the right and left ends of the push rod 313 divide the sound-damping chamber 112, and the middle of the push rod 313 is exposed, so that friction generated between the push rod 313 and the housing 11 during movement can be reduced.
In the present embodiment, the housing 11 includes a first housing 113, a second housing 114, and a third housing 115, which are arranged in this order, the first housing 113, the second housing 114, and the third housing 115 are detachably connected, the expansion chamber 111 and the sound damping chamber 112 are located in the second housing 114, the first pipe 12 is inserted in the first housing 113, and the first end of the first pipe 12 protrudes from the first housing 113, the third pipe 21 is inserted in the second housing 114, the second pipe 13 is inserted in the third housing 115, and the first end of the second pipe 13 protrudes from the third housing 115.
In the above embodiment, the housing 11 is provided as the first housing 113, the second housing 114, and the third housing 115, which facilitates the assembly between the first pipe 12, the second pipe 13, and the third pipe 21, and which facilitates maintenance.
The first pipe 12, the second pipe 13 and the third pipe 21 have the same inner diameter, for example, 25mm, and are fitted into a liquid charging pipe having an inner diameter of 25 mm. The outer diameters of the first, second and third housings 113, 114 and 115 may be 100mm.
Illustratively, the second end of the first conduit 12 and the peripheral wall of the second end of the second conduit 13 are both externally threaded to facilitate installation of the entire muffler in a charging line.
In one implementation of the present invention, the first housing 113 is inserted with a fastening bolt 1131, a first end of the fastening bolt 1131 is in threaded engagement with a second end of the sound attenuation chamber 112, and the piezoelectric ceramic 312 abuts against the first end of the fastening bolt 1131.
In the above embodiment, on the one hand, the fastening bolt 1131 plays a role in connecting the first housing 113 and the second housing 114, and on the other hand, plays a role in limiting the piezoelectric ceramic 312, so that the piezoelectric ceramic 312 deforms in a direction away from the fastening bolt 1131, and further the valve core 311 is driven to move conveniently.
Illustratively, a plurality of connection bolts 1151 are inserted into the third housing 115 to connect the third housing 115 and the second housing 114, thereby detachably connecting the third housing 115 and the second housing 114.
Illustratively, the third housing 115 has a communication hole 1152, and two ends of the communication hole 1152 are respectively communicated with the sound-damping chamber 112 and the second pipe 13.
In the present embodiment, the control unit 31 further includes a noise sensor and a computer, the noise sensor being located in the first pipe 12, and the noise sensor, the computer and the controller being electrically connected in this order.
Illustratively, the noise sensor collects the low-frequency line spectrum noise in the first pipeline 12, inputs the low-frequency line spectrum noise to the computer, calculates the low-frequency line spectrum noise through the adaptive filtering algorithm, and outputs a signal to the controller to control the piezoelectric ceramic 312 to generate corresponding deformation. The piezoelectric ceramic 312 drives the valve core 311 to move through the push rod 313, so that pulsation noise is generated in the second pipeline 13, and the pulsation noise can be offset with low-frequency line spectrum noise in the liquid filling pipeline. In addition, a noise sensor can be also arranged in the second pipeline 13, the noise after control is transmitted to a computer, and the self-adaptive filtering algorithm adjusts the output signal, so that the output signal is regulated and controlled again, errors are eliminated, and the optimal noise elimination effect of low-frequency line spectrum noise is achieved.
In this embodiment, the number of the control units 31 and the silencing cavities 112 is plural, and the control units 31 and the silencing cavities 112 are in one-to-one correspondence, so as to achieve a better silencing effect. In addition, different control units 31 can respectively receive different control signals to perform independent work, and the damage of a single control unit 31 has no influence on the overall performance of the muffler.
Illustratively, the control unit 31 and the sound-damping chamber 112 are each 4 and are arranged at intervals along the circumferential direction of the second housing 114.
Illustratively, the apertures 211 may be 1-2mm in diameter, and the spacing between two adjacent apertures 211 may be 2-5mm (the distribution may be triangular or rectangular).
It should be noted that the diameter of the small holes 211 and the distance between the small holes 211 can be adjusted according to the actual pipe diameter and flow rate of the liquid filling pipe
Illustratively, the sealing rings 4 are sandwiched between the first pipe 12 and the third pipe 21 and between the second pipe 13 and the third pipe 21, so as to prevent leakage at the joint.
For example, the housing 11 may be made of metal, rubber, or other materials, and the second housing 114 may be filled with sound absorbing material to further attenuate sound.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (9)
1. An active-passive composite muffler for a liquid filling pipeline, which is characterized by comprising a shell assembly (1), a first muffler assembly (2) and a second muffler assembly (3);
The shell assembly (1) comprises a shell (11), a first pipeline (12) and a second pipeline (13), wherein an expansion cavity (111) and at least one silencing cavity (112) are formed in the shell (11), the first pipeline (12) and the second pipeline (13) are coaxially arranged, the first pipeline (12) and the second pipeline (13) are respectively inserted into two ends of the shell (11), and the first end of the silencing cavity (112) is communicated with the second pipeline (13);
The first silencing assembly (2) comprises a third pipeline (21), the third pipeline (21) is inserted into the expansion cavity (111), the outer diameter of the third pipeline (21) is smaller than the inner diameter of the expansion cavity (111), two ends of the third pipeline (21) are respectively and coaxially communicated with the first pipeline (12) and the second pipeline (13), and a plurality of small holes (211) communicated with the expansion cavity (111) are formed in the circumferential direction of the third pipeline (21);
the second silencing assembly (3) comprises a controller and a control unit (31), the control unit (31) comprises a valve core (311) and piezoelectric ceramics (312), the controller is electrically connected with the piezoelectric ceramics (312), the valve core (311) is movably inserted into the silencing cavity (112), the piezoelectric ceramics (312) are positioned in the silencing cavity (112), and the piezoelectric ceramics (312) are in transmission fit with the valve core (311) so as to push the valve core (311) to move;
The shell (11) comprises a first shell (113), a second shell (114) and a third shell (115) which are sequentially arranged, the first shell (113), the second shell (114) and the third shell (115) are detachably connected, the expansion cavity (111) and the silencing cavity (112) are located in the second shell (114), the first pipeline (12) is inserted into the first shell (113), the first end of the first pipeline (12) extends out of the first shell (113), the third pipeline (21) is inserted into the second shell (114), the second pipeline (13) is inserted into the third shell (115), and the first end of the second pipeline (13) extends out of the third shell (115).
2. The active-passive composite muffler for a liquid filling pipe according to claim 1, wherein the control unit (31) further comprises a push rod (313), the push rod (313) is slidably inserted into the muffling cavity (112), and two ends of the push rod (313) are respectively in transmission connection with the piezoelectric ceramic (312) and the valve core (311).
3. An active and passive composite muffler for a charge pipe according to claim 1, wherein the second end of the first pipe (12) and the peripheral wall of the second end of the second pipe (13) are externally threaded.
4. The active-passive composite muffler for a liquid filled pipe according to claim 1, wherein a fastening bolt (1131) is inserted on the first housing (113), a first end of the fastening bolt (1131) is in threaded engagement with a second end of the muffling cavity (112), and the piezoelectric ceramic (312) abuts against the first end of the fastening bolt (1131).
5. The active and passive composite muffler for a charge pipe according to claim 1, wherein a plurality of connection bolts (1151) are inserted on the third housing (115) to connect the third housing (115) and the second housing (114).
6. An active and passive composite muffler for a liquid filled pipe according to any one of claims 1-5, wherein the control unit (31) further comprises a noise sensor and a computer, the noise sensor being located in the first conduit (12), and the noise sensor, the computer and the controller being electrically connected in sequence.
7. The active-passive composite muffler for a liquid filling pipe according to any one of claims 1 to 5, wherein the number of the control units (31) and the number of the muffling chambers (112) are plural, and the plurality of the control units (31) and the plurality of the muffling chambers (112) are in one-to-one correspondence.
8. An active and passive composite muffler for a liquid filled pipe according to any one of claims 1 to 5, wherein the diameter of the small hole (211) is 1 to 2mm, and the distance between two adjacent small holes (211) is 2 to 5mm.
9. An active and passive composite muffler for a charging line according to any of claims 1-5, characterized in that sealing rings (4) are sandwiched between the first pipe (12) and the third pipe (21) and between the second pipe (13) and the third pipe (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210176737.3A CN114396523B (en) | 2022-02-24 | 2022-02-24 | Active and passive composite muffler for liquid filling pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210176737.3A CN114396523B (en) | 2022-02-24 | 2022-02-24 | Active and passive composite muffler for liquid filling pipeline |
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| Publication Number | Publication Date |
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| CN114396523A CN114396523A (en) | 2022-04-26 |
| CN114396523B true CN114396523B (en) | 2024-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210176737.3A Active CN114396523B (en) | 2022-02-24 | 2022-02-24 | Active and passive composite muffler for liquid filling pipeline |
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