CN114183405A - Inlet silencer of axial flow pump - Google Patents
Inlet silencer of axial flow pump Download PDFInfo
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- CN114183405A CN114183405A CN202111405177.6A CN202111405177A CN114183405A CN 114183405 A CN114183405 A CN 114183405A CN 202111405177 A CN202111405177 A CN 202111405177A CN 114183405 A CN114183405 A CN 114183405A
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- silencer
- section
- blade
- inlet
- flow pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
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- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses an inlet silencer of an axial flow pump, which comprises an inlet horn section, an impeller section, a guide vane section, an outlet bend section, an inlet pipe and a silencer, wherein the inlet pipe is connected with the upstream end of the inlet horn section; the silencer blade is formed by connecting an inlet section, an arc transition section and an outlet section in sequence, wherein the inlet section of the silencer blade is a straight plate and is vertical to the incoming flow direction, the arc transition section of the silencer blade is two curved surfaces, the arc transition section is bent in an S shape, and the outlet section is a straight plate and is parallel to the outlet liquid flow. The inlet silencer can effectively inhibit the noise generated in the impeller from being transmitted to the water area by the axial flow pump, and greatly reduces the influence of the noise on the fishes.
Description
Technical Field
The invention relates to the technical field of hydraulic fluid machinery design, in particular to an inlet silencer of an axial flow pump.
Background
The large low-lift axial-flow pump is widely applied to the fields of agricultural irrigation, water transfer engineering and the like, in the operation process of the axial-flow pump, the inlet of the axial-flow pump continuously releases noise to a water area, the damage of inner ear hair cells of fishes possibly caused by the influence of the noise generates temporary (temporary threshold shift) or permanent (permanent threshold shift) hearing loss, the viscera of the fishes are broken even caused to die in serious conditions, the damage to the fishes not only influences the water body environment, but also provides great challenge for the protection of endangered aquatic animals. Therefore, the adverse effect of the noise generated by the operation of the axial flow pump on aquatic animals is a technical problem which needs to be solved at present.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides an inlet silencer of an axial flow pump, which effectively reduces the intensity of noise released by the traditional axial flow pump to a water area, reduces the damage of the noise to fishes, improves the ecological environment of the water area and is beneficial to the protection of biodiversity.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides an import muffler of axial-flow pump, its includes import horn section, impeller section, stator section, export bend section, import pipe, muffler, and import horn section, impeller section, stator section, export bend section connect gradually along fluid direction, and the upper reaches end of import horn section is connected with the import pipe, is provided with muffler, its characterized in that in the import pipe: the silencer comprises a silencer blade which is a single blade or a plurality of blades.
Furthermore, the silencer blade is formed by sequentially connecting an inlet section, an arc transition section and an outlet section, the inlet section of the silencer blade is a straight plate and is vertical to the incoming flow direction, the arc transition section of the silencer blade is two curved surfaces, the arc transition section is bent in an S shape, and the outlet section is a straight plate and is parallel to the outlet liquid flow.
Further, in a certain circumferential section development figure of the silencer blade, the blade section is centrosymmetric about an origin O, the silencer blade is an equal-thickness blade, and the slope angle a of the arc transition section at the origin O is 30-60 degrees.
Further, the transverse length of the silencer blade in a certain circumferential section development is L, the axial length of the circumferential section development is H, and for a single-blade silencer, L/H is 0.42-0.62; for multi-vane mufflers, L/H is 0.72-0.92.
Further, the muffler includes a plurality of muffler blades, wheel hub, and a plurality of muffler blades evenly set up in wheel hub's periphery, and wheel hub's upper reaches end is equipped with first water conservancy diversion portion, and first water conservancy diversion portion is convex water conservancy diversion portion, and wheel hub's low reaches end is equipped with second water conservancy diversion portion, and second water conservancy diversion portion includes toper portion and arc portion, and the arc portion is located the low reaches end of toper portion, and the outer peripheral face of second water conservancy diversion portion sets up in a plurality of recesses, and a plurality of recesses are even or inhomogeneous distributes in the outer peripheral face of second water conservancy diversion portion, and the recess is circular recess.
Furthermore, a plurality of communicating holes are formed in the radial inner edge or the radial root of the silencer blade, and the communicating holes are respectively communicated with two side surfaces of the silencer blade; the plurality of communication holes are distributed along the length direction of the silencer blade, and the communication holes are generally rectangular or semicircular.
Further, the outer diameter Dh of the hub is 1/5-1/3 of the silencer blade outer diameter Ds.
Further, for a multi-vane muffler, the number of muffler vanes is 3-4.
Has the advantages that:
according to the inlet silencer of the axial flow pump, the silencer blade is formed by sequentially connecting the inlet section, the arc-shaped transition section and the outlet section, so that the overall performance of the axial flow pump can be ensured, and a good silencing effect can be ensured. The invention can effectively reduce the noise of the transitional water flow area between the silencer blade and the inlet horn section through the design of the second flow guide part and the plurality of grooves, and the plurality of grooves have certain noise reflection or diffusion inhibiting effect on the noise. The invention can balance or reduce the pressure fluctuation on two side surfaces of the blade through the design of the plurality of communicating holes, thereby reducing the noise generated by the pressure fluctuation.
The inlet silencer of the axial flow pump can effectively inhibit the noise generated in the impeller from being transmitted to the water area by the axial flow pump, greatly reduces the influence of the noise on fishes, and has important significance for protecting aquatic organisms and ecological environment.
Drawings
FIG. 1 is a schematic view of a single vane configuration of an inlet silencer of an axial flow pump of the present invention;
FIG. 2 is a schematic view of a multi-vane configuration of the inlet silencer of the axial flow pump of the present invention;
FIG. 3 is a schematic expanded circumferential cross-sectional view of a single-vane muffler vane of the present invention;
FIG. 4 is an expanded view of a circumferential cross-section of a vane of the multi-vane muffler of the present invention;
FIG. 5 is a schematic view of another embodiment of a multiple vane silencer for an axial flow pump according to the present invention;
FIG. 6 is a schematic view of a single vane silencer for an axial flow pump according to the present invention;
FIG. 7 is a schematic view of a three-dimensional model of a single-vane silencer for an axial flow pump according to the present invention;
FIG. 8 is a schematic view of a three-dimensional model of a multi-vane silencer of an axial flow pump according to the present invention.
In the figure: the structure comprises an inlet trumpet section 1, an impeller section 2, a guide vane section 3, an outlet elbow section 4, an inlet pipe 5, a silencer 6, a blade 61, a hub 62, a first flow guide part 63, a second flow guide part 64, a groove 65, a communication hole 66, an inlet section 611, an arc transition section 612 and an outlet section 613.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. 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. 1-8, an inlet silencer of an axial flow pump includes an inlet horn section 1, an impeller section 2, a guide vane section 3, an outlet elbow section 4, an inlet pipe 5, and a silencer 6, wherein the inlet horn section 1, the impeller section 2, the guide vane section 3, and the outlet elbow section 4 are sequentially connected in a fluid direction, the upstream end of the inlet horn section 1 is connected with the inlet pipe 5, the inlet pipe 5 is internally provided with the silencer 6, the silencer 6 includes silencer blades 61, and the silencer blades 61 are single blades or multiple blades.
As shown in fig. 3-4, the single-vane inlet silencer is formed by connecting an inlet section 611, an arc-shaped transition section 612, and an outlet section 613 in sequence. The inlet section 611 of the silencer blade 61 is a straight plate and is perpendicular to the incoming flow direction, and mainly functions to guide the liquid flow into the silencer; the curved transition section 612 of the silencer vane 61 is a two-section curved surface, which mainly plays a role in reflecting noise and increasing the on-way loss of the noise, and finally reduces the noise at the inlet of the axial flow pump.
Next, each parameter of the single-blade silencer blade 61 will be described with reference to a developed view of a circumferential section of the blade 61, in which the blade section is symmetrical about the center of the origin O and the silencer blade 61 is an equal-thickness blade. The blade inlet section 611 is a straight plate and is parallel to the inlet flow, which is to introduce the flow into the blade; the arcuate transition section 612 is bent in an S-shape to better prevent noise generated in the impeller from diffusing through the silencer. In addition, the slope of the arc transition section at the original point O is not too small, the too small slope can better reflect noise generated in the impeller and has a better noise reduction effect, but the too small slope has a bad influence on the performance of the axial flow pump, and the too small slope causes the liquid flow to generate flow separation at the arc transition section to form a vortex and finally reduces the efficiency of the axial flow pump; the slope of the arc-shaped transition section 612 at the origin O should not be too large, and the too large slope will have a small influence on the performance of the axial flow pump, but the sound attenuation effect will be sharply reduced. Therefore, the slope angle a of the transition section at the origin is optimal at 30-60 degrees, so that the overall performance of the axial-flow pump can be ensured, and a good silencing effect can be ensured. The blade outlet section 613 is a straight plate and is parallel to the outlet flow, which is to better introduce the flow to the impeller inlet; the outlet section 613 is a straight plate, which mainly introduces the liquid flow in the silencer vertically to the inlet of the impeller, and in addition, the straight plate also has the function of eliminating the prerotation of the inlet of the impeller, so that the overall performance of the axial flow pump can be improved, namely the lift and efficiency of the axial flow pump are improved to a certain extent, and the tendency of a saddle area of the axial flow pump is effectively relieved.
In addition, in order to ensure the noise reduction effect in each direction of the circumference, the transverse length of the expanded view of the circumferential section of the silencer blade 61 is L, so that the single-blade silencer can reflect the noise generated in the impeller in the circumferential direction; the axial length of the blade circumferential section development is H, H is not too large, the size of the silencer can be increased due to the too large axial size, so that the overall size of the axial flow pump is increased, and the production cost of the axial flow pump is further increased. For a single-vane silencer, preferably, L/H is 0.42 to 0.62, and preferably, L/H is 0.5 to 0.55.
Next, each parameter of the vane will be described with reference to a developed view of a circumferential section of the multi-vane silencer vane 61, in which the vane section is symmetrical about the center of the origin O and the vane is a vane having an equal thickness. The inlet section 612 of the silencer vane 61 is a straight plate and is parallel to the inlet flow, which is to introduce the flow into the vane. The arcuate transition section 612 is bent in an S-shape to better prevent noise generated in the impeller from passing through the silencer. In addition, the slope of the arc-shaped transition section at the original point O is not too small, the too small slope can better reflect noise generated in the impeller and has a better noise reduction effect, but the too small slope has adverse effect on the performance of the axial flow pump, and the too small slope causes the liquid flow to generate flow separation at the transition section to form a vortex and finally reduces the efficiency of the axial flow pump; the slope of the transition section at the original point is not too large, and the too large slope has less influence on the performance of the axial flow pump, but the silencing effect is reduced sharply. Therefore, the slope angle a of the arc transition section at the original point O is the best at 30-60 degrees, so that the integral performance of the axial-flow pump can be ensured, and a good silencing effect can be ensured. The blade outlet section 613 is a straight plate and is parallel to the outlet flow, which is to better introduce the flow to the impeller inlet; the outlet section 613 is a straight plate, which mainly introduces the liquid flow in the silencer vertically to the inlet of the impeller, and in addition, the straight plate also has the function of eliminating the prerotation of the inlet of the impeller, so that the overall performance of the axial flow pump can be improved, namely the lift and efficiency of the axial flow pump are improved to a certain extent, and the tendency of a saddle area of the axial flow pump is effectively relieved.
In addition, in order to ensure the noise reduction effect in each direction of the circumference, the transverse length of the developed view of the circumferential section of the blade is L1(L), and the product of L1 and the number Z of the blades is equal to the circumference of the section, so that the multi-blade silencer can reflect the noise generated in the impeller in the circumferential direction and further has better noise reduction effect. The axial length H1(H) of the expanded view of the circumferential section of the silencer vane 61 is not too large, and the too large axial dimension increases the size of the silencer, thereby increasing the overall size of the axial flow pump and further increasing the production cost of the axial flow pump. For multi-vane mufflers, L/H is preferably 0.72 to 0.92, and preferably 0.75 to 0.85.
The larger the number of blades of the multi-blade silencer, the smaller the size of the silencer, but the greater the energy loss when the fluid passes through the silencer, so in order to ensure both good efficiency and good silencing effect of the axial flow pump, the optimal number of blades of the silencer blade 61 is 3-4.
As shown in fig. 5, in a preferred embodiment, the muffler 6 includes a plurality of muffler blades 61 and a hub 62, the muffler blades 61 are uniformly disposed on the periphery of the hub 62, the upstream end of the hub 62 is provided with a first flow guiding portion 63, the first flow guiding portion 63 is an arc-shaped flow guiding portion, the downstream end of the hub 62 is provided with a second flow guiding portion 64, the second flow guiding portion 64 includes a tapered portion and an arc-shaped portion, the arc-shaped portion is located at the downstream end of the tapered portion, the outer circumferential surface of the second flow guiding portion 64 is disposed in a plurality of grooves 65, the grooves 65 are uniformly or non-uniformly distributed on the outer circumferential surface of the second flow guiding portion 64, and the grooves 65 are circular grooves.
According to the invention, through the design of the second flow guide part 64 and the plurality of grooves 65, the noise of the transitional water flow area between the silencer blade 61 and the inlet horn section 1 can be effectively reduced, and the plurality of grooves 65 have a certain noise reflection or diffusion inhibiting effect on the noise.
Further, a plurality of communication holes 66 are formed in the radial inner edge or radial root of the silencer blade 61, and the plurality of communication holes 66 are respectively communicated with two side surfaces of the silencer blade 61; a plurality of communication holes 66 are distributed along the length direction of the silencer vane 61, and the communication holes 66 are substantially rectangular or semicircular. The present invention can balance or reduce the pressure fluctuation on both sides of the vane 61 by the design of the plurality of communication holes 66, thereby reducing the noise generated by the pressure fluctuation.
Further, in order to ensure the structural strength of the silencer blade 61, the outer diameter Dh of the hub 62 is 1/5-1/3 of the outer diameter Ds of the silencer blade 61, an excessively large hub diameter will cause blockage of the inlet fluid flow, and an excessively small hub diameter will greatly reduce the structural strength of the silencer blade.
According to the inlet silencer of the axial flow pump, the silencer blade 61 is formed by sequentially connecting the inlet section 611, the arc-shaped transition section 612 and the outlet section 613, so that the overall performance of the axial flow pump can be ensured, and a good silencing effect can be ensured. According to the invention, through the design of the second flow guide part 64 and the plurality of grooves 65, the noise of the transitional water flow area between the silencer blade 61 and the inlet horn section 1 can be effectively reduced, and the plurality of grooves 65 have a certain noise reflection or diffusion inhibiting effect on the noise. The present invention can balance or reduce the pressure fluctuation on both sides of the vane 61 by the design of the plurality of communication holes 66, thereby reducing the noise generated by the pressure fluctuation.
The inlet silencer of the axial flow pump can effectively inhibit the noise generated in the impeller from being transmitted to the water area by the axial flow pump, greatly reduces the influence of the noise on fishes, and has important significance for protecting aquatic organisms and ecological environment.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (8)
1. The utility model provides an import muffler of axial-flow pump, it includes import horn section (1), impeller section (2), stator section (3), export bend section (4), import pipe (5), muffler (6), import horn section (1), impeller section (2), stator section (3), export bend section (4) connect gradually along the fluid direction, the upper reaches end of import horn section (1) is connected with import pipe (5), is provided with muffler (6) in import pipe (5), its characterized in that: the silencer (6) comprises a silencer blade (61), and the silencer blade (61) is a single blade or multiple blades.
2. The intake silencer of an axial flow pump according to claim 1, wherein the silencer blade (61) is formed by connecting an intake section (611), an arc-shaped transition section (612) and an outlet section (613) in sequence, the intake section (611) is a straight plate and is perpendicular to the incoming flow direction, the arc-shaped transition section (612) is a two-section curved surface, the arc-shaped transition section (612) is bent in an "S" shape, and the outlet section (613) is a straight plate and is parallel to the outlet flow.
3. The intake silencer of an axial flow pump according to claim 2, wherein the silencer blade (61) has a blade cross section which is centrosymmetric about an origin O and is a uniform-thickness blade in a circumferential cross-sectional development view, and the slope angle a of the curved transition section (612) at the origin O is 30-60 °.
4. An inlet silencer for an axial flow pump according to claim 3, characterized in that the silencer blade (61) has a circumferential cross-sectional development with a transverse length L and a circumferential cross-sectional development with an axial length H, and in the case of a single-blade silencer, L/H is 0.42-0.62; for multi-vane mufflers, L/H is 0.72-0.92.
5. The inlet silencer of the axial flow pump according to any one of claims 2 or 4, wherein the silencer (6) includes a plurality of silencer blades (61) and a hub (62), the plurality of silencer blades (61) are uniformly disposed on the periphery of the hub, a first flow guide portion (63) is disposed at an upstream end of the hub, the first flow guide portion (63) is an arc-shaped flow guide portion, a second flow guide portion (64) is disposed at a downstream end of the hub (62), the second flow guide portion (64) includes a tapered portion and an arc-shaped portion, the arc-shaped portion is disposed at a downstream end of the tapered portion, an outer peripheral surface of the second flow guide portion (64) is disposed in the plurality of grooves (65), the plurality of grooves (65) are uniformly or non-uniformly distributed on an outer peripheral surface of the second flow guide portion (64), and the grooves (65) are circular grooves.
6. An inlet silencer of an axial flow pump according to claim 5, wherein a plurality of communication holes (66) are formed in a radial inner edge or a radial root of the silencer blade (61), and the plurality of communication holes (66) are respectively communicated with two side surfaces of the silencer blade (61); the communication holes (66) are distributed along the length direction of the silencer blade (61), and the communication holes (66) are rectangular or semicircular.
7. An inlet silencer for an axial flow pump according to claim 6, wherein the outer diameter Dh of said hub (62) is 1/5-1/3 of the outer diameter Ds of the silencer blade (61).
8. An inlet silencer for an axial flow pump according to claim 7, characterized in that the number of silencer vanes (61) is 3-4 for a multi-vane silencer.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111405177.6A CN114183405B (en) | 2021-11-24 | 2021-11-24 | Inlet silencer of axial flow pump |
| PCT/CN2022/130221 WO2023093507A1 (en) | 2021-11-24 | 2022-11-07 | Inlet silencer of axial-flow pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111405177.6A CN114183405B (en) | 2021-11-24 | 2021-11-24 | Inlet silencer of axial flow pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114183405A true CN114183405A (en) | 2022-03-15 |
| CN114183405B CN114183405B (en) | 2023-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111405177.6A Active CN114183405B (en) | 2021-11-24 | 2021-11-24 | Inlet silencer of axial flow pump |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN114183405B (en) |
| WO (1) | WO2023093507A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023093507A1 (en) * | 2021-11-24 | 2023-06-01 | 江苏大学 | Inlet silencer of axial-flow pump |
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| CN101210564A (en) * | 2006-12-25 | 2008-07-02 | 上海东方泵业(集团)有限公司 | Vertical axial flow pump equipped with direct connection type water cooling motor |
| CN201696356U (en) * | 2010-04-26 | 2011-01-05 | 浙江志江风机有限公司 | Built-in cone-shaped muffler device |
| WO2018182290A1 (en) * | 2017-03-28 | 2018-10-04 | 주식회사 이엔테크 | Generator silencer |
| CN108860539A (en) * | 2018-07-23 | 2018-11-23 | 山东韩德节能设备有限公司 | A kind of axial-flow pump formula propeller |
| CN110043477A (en) * | 2019-05-23 | 2019-07-23 | 高邮环流泵业有限公司 | Axial-flow pump |
| CN209469590U (en) * | 2018-12-25 | 2019-10-08 | 德能泵业（天津）有限公司 | A kind of horizontal submersible axial flow pump |
| CN110454408A (en) * | 2019-09-18 | 2019-11-15 | 安徽奥利威泵阀机械有限公司 | A kind of canned motor pump with noise reduction function |
| CN212407100U (en) * | 2020-08-12 | 2021-01-26 | 张家港市众兴成特种装备有限公司 | Low-noise axial-flow fan |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183405B (en) * | 2021-11-24 | 2023-05-05 | 江苏大学 | Inlet silencer of axial flow pump |
-
2021
- 2021-11-24 CN CN202111405177.6A patent/CN114183405B/en active Active
-
2022
- 2022-11-07 WO PCT/CN2022/130221 patent/WO2023093507A1/en unknown
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101210564A (en) * | 2006-12-25 | 2008-07-02 | 上海东方泵业(集团)有限公司 | Vertical axial flow pump equipped with direct connection type water cooling motor |
| CN201696356U (en) * | 2010-04-26 | 2011-01-05 | 浙江志江风机有限公司 | Built-in cone-shaped muffler device |
| WO2018182290A1 (en) * | 2017-03-28 | 2018-10-04 | 주식회사 이엔테크 | Generator silencer |
| CN108860539A (en) * | 2018-07-23 | 2018-11-23 | 山东韩德节能设备有限公司 | A kind of axial-flow pump formula propeller |
| CN209469590U (en) * | 2018-12-25 | 2019-10-08 | 德能泵业（天津）有限公司 | A kind of horizontal submersible axial flow pump |
| CN110043477A (en) * | 2019-05-23 | 2019-07-23 | 高邮环流泵业有限公司 | Axial-flow pump |
| CN110454408A (en) * | 2019-09-18 | 2019-11-15 | 安徽奥利威泵阀机械有限公司 | A kind of canned motor pump with noise reduction function |
| CN212407100U (en) * | 2020-08-12 | 2021-01-26 | 张家港市众兴成特种装备有限公司 | Low-noise axial-flow fan |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023093507A1 (en) * | 2021-11-24 | 2023-06-01 | 江苏大学 | Inlet silencer of axial-flow pump |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023093507A1 (en) | 2023-06-01 |
| CN114183405B (en) | 2023-05-05 |
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