CN114608198A - High-efficiency pump device for boiler equipment - Google Patents
High-efficiency pump device for boiler equipment Download PDFInfo
- Publication number
- CN114608198A CN114608198A CN202210185026.2A CN202210185026A CN114608198A CN 114608198 A CN114608198 A CN 114608198A CN 202210185026 A CN202210185026 A CN 202210185026A CN 114608198 A CN114608198 A CN 114608198A
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- CN
- China
- Prior art keywords
- flow guide
- volute
- flow
- boiler
- impeller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
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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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
- F04D29/428—Discharge tongues
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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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0005—Details for water heaters
- F24H9/001—Guiding means
- F24H9/0015—Guiding means in water channels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a high-efficiency pump device for boiler equipment, the boiler equipment comprises a boiler body (10), a combustor (20), a combustion chamber (30), a heat exchanger (40), a pump device and a blower device, the pump device comprises a volute (1), an impeller (2), an outlet pipe (3), a tongue (4) and a flow guide body (5), the position, close to the tongue, in the volute is provided with the flow guide body, a first flow channel (6) is formed between the flow guide body and the volute wall adjacent to the flow guide body, and a second flow channel (7) is formed between the flow guide body and the periphery of the impeller, and the high-efficiency pump device is characterized in that: the flow guide body (5) comprises a flow guide part and a rotating body (53), the flow guide part is in a wing shape, an arc-shaped groove is formed in one end of the flow guide part, the rotating body is arranged in the arc-shaped groove, and the rotating body is rotatably connected with the volute. The invention can make most of the vortex generated at the tongue part flow along the second flow channel by the design of the flow guide body (flow guide part and rotating body), thereby inhibiting the pressure pulsation at the tongue part and improving the stability maintaining performance of the pump.
Description
Technical Field
The invention relates to the technical field of industrial boiler equipment and accessories thereof, in particular to a high-efficiency pump device for boiler equipment.
Background
The boiler is an energy converter, which is a device for heating working medium water or other fluids to certain parameters by using heat energy released by fuel combustion or other heat energy. As shown in fig. 1, the conventional boiler apparatus includes a boiler body 10, a burner 20, a combustion chamber 30, a heat exchanger 40, a pump device, an air blowing device, an air exhausting device, and a valve assembly, wherein the burner 20 is disposed at one end of the boiler body 10, the combustion chamber 30 and the heat exchanger 40 are disposed in the boiler body 10, the pump device is connected to the boiler body 10 through a pipe, the air blowing device and the air exhausting device are connected to the boiler body 10 through a pipe, and the pump device is used for supplying water with a stable pressure and flow rate to the boiler body 10 and has certain requirements on the performance of the pump device.
As shown in fig. 2, a pump device/circulating water pump in the prior art includes a volute 1, an impeller 2, an outlet pipe 3, a tongue 4, and a flow guide body 5, wherein the impeller 2 is installed in a volute cavity formed by the volute 1, the outlet end of the volute 1 is provided with the outlet pipe 3, the tongue 4 is disposed on one side of the outlet pipe 3 connected to the volute 1, the flow guide body 5 is disposed in the volute 1 near the tongue 4, the flow guide body 5 is located between an inner wall of the volute 1 and an outer periphery of the impeller 2, a first flow channel is formed between the flow guide body 5 and an adjacent volute wall, and a second flow channel is formed between the flow guide body 5 and the outer periphery of the impeller 2. However, the existing pump device has the problems that the vortex generated at the tongue part is large, the vortex pulsation is large, and the pump performance needs to be further improved.
Disclosure of Invention
The present invention is directed to overcome the disadvantages of the prior art, and to provide a high efficiency pump device for a boiler plant, which is capable of flowing most of the vortex generated at the tongue along the second flow channel by the design of the guide body (guide portion, rotating body), thereby suppressing/reducing the pulsation of the vortex at the tongue, and improving the pump stability.
In order to achieve the purpose, the invention adopts the technical scheme that:
a high-efficiency pump device for boiler equipment comprises a boiler body (10), a burner (20), a combustion chamber (30), a heat exchanger (40), a pump device, a blower device, an exhaust device and a valve component, wherein the burner is arranged at one end of the boiler body, the combustion chamber and the heat exchanger are arranged in the boiler body, the pump device is connected with the boiler body through a pipeline, the blower device and the exhaust device are connected with the boiler body through a pipeline, the pump device comprises a volute (1), an impeller (2), an outlet pipe (3), a tongue part (4) and a flow guide body (5), the impeller is arranged in a volute cavity formed by the volute, the outlet end of the volute is provided with the outlet pipe, the tongue part is arranged at one side of the outlet pipe, which is connected with the volute, the flow guide body is arranged in the volute, which is close to the tongue part, the flow guide body is positioned between the inner wall of the volute and the periphery of the impeller, and a first flow channel (6) is formed between the flow guide body and the volute wall adjacent to the impeller, form second runner (7) between baffle and the impeller periphery, the centre of a circle of impeller (2) is O, crosses centre of a circle O and establishes X-Y axle coordinate system, and the Y axle is parallel with the central line of outlet pipe (3), its characterized in that: the flow guide body (5) comprises a flow guide part and a rotating body (53), the flow guide part is in a wing shape, an arc-shaped groove is formed in one end of the flow guide part, the rotating body is arranged in the arc-shaped groove, and the rotating body is rotatably connected with the volute.
Furthermore, the flow guide part is an arc-shaped flow guide part and comprises a first flow guide part (51) and a second flow guide part (52), the first flow guide part and the second flow guide part are sequentially connected, the first flow guide part is provided with the arc-shaped groove, the first flow guide part (51) is arranged in an approximately equal thickness mode, and the second flow guide part (52) is arranged in a gradually reducing mode.
Further, the rotation direction of the impeller (2) is anticlockwise, the rotation direction of the rotating body (53) is clockwise, and the radial gap width of the first flow channel (6) is smaller than that of the corresponding second flow channel (7).
Furthermore, different pressure differences are generated in the first flow passage (6) and the second flow passage (7), so that the rotating body (53) rotates clockwise; the pressure in the first flow passage is greater than the pressure in the second flow passage.
Furthermore, a connecting line of the middle point of the tongue part (4) and the circle center O is taken as a starting line, the central angle a occupied by the flow guide body (5) along the circumferential direction is 30-70 degrees, and the central angle a is basically symmetrically arranged about the Y axis.
Furthermore, the rotating body (53) comprises a rotating shaft (54) and fins (55), wherein the periphery of the rotating shaft is provided with a plurality of uniformly distributed fins which are obliquely arranged relative to the axis of the rotating shaft; the rotating body (53) is rotatably connected with the volute (1) through a bearing.
The invention relates to a high-efficiency pump device for boiler equipment, which can enable most of vortex generated at a tongue part to flow along a second flow passage through the design of a flow guide body (a flow guide part and a rotating body), thereby inhibiting the vortex pulsation at the tongue part and improving the stability of the pump.
Drawings
FIG. 1 is a schematic diagram of a prior art boiler plant configuration;
FIG. 2 is a schematic view of a prior art pump apparatus;
FIG. 3 is a schematic structural view of a high efficiency pump apparatus for a boiler plant according to the present invention;
FIG. 4 is a schematic structural view of a high efficiency pump apparatus for a boiler plant according to the present invention;
FIG. 5 is a schematic view showing a structure of a rotary body of the high-efficiency pump apparatus for a boiler plant according to the present invention.
In the figure: the boiler comprises a boiler body 10, a combustor 20, a combustion chamber 30, a heat exchanger 40, a volute 1, an impeller 2, an outlet pipe 3, a tongue 4, a flow guide body 5, a first flow guide part 51, a second flow guide part 52, a rotating body 53, a rotating shaft 54, a fin 55, a first flow channel 6 and a second flow channel 7.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1-5, a high-efficiency pump device for a boiler apparatus, the boiler apparatus includes a boiler body 10, a burner 20, a combustion chamber 30, a heat exchanger 40, a pump device, a blower device, an exhaust device, and a valve assembly, the burner 20 is disposed at one end of the boiler body 10, the combustion chamber 30 and the heat exchanger 40 are disposed in the boiler body 10, the pump device is connected to the boiler body 10 through a pipeline, the blower device and the exhaust device are connected to the boiler body 10 through a pipeline, the pump device includes a volute 1, an impeller 2, an outlet pipe 3, a tongue 4, and a flow guide body 5, the impeller 2 is mounted in a volute cavity formed by the volute 1, the outlet end of the volute 1 is provided with the outlet pipe 3, the tongue 4 is disposed at one side of the outlet pipe 3 connected to the volute 1, a flow guide body 5 is disposed in the volute 1 near the tongue 4, and the flow guide body 5 is located between the inner wall of the volute 1 and the periphery of the impeller 2, a first flow channel 6 is formed between the guide body 5 and the volute wall adjacent to the guide body, a second flow channel 7 is formed between the guide body 5 and the periphery of the impeller 2, the circle center of the impeller 2 is O, an X-Y axis coordinate system is established by passing through the circle center O, and the Y axis is parallel to the central line of the outlet pipe 3, and the spiral flow-guiding device is characterized in that: the flow guiding body 5 comprises a flow guiding part and a rotating body 53, the flow guiding part is in the shape of a wing, an arc-shaped groove is formed in one end of the flow guiding part, the rotating body 53 is arranged in the arc-shaped groove, and the rotating body 53 is rotatably connected with the volute 1.
Further, the flow guide part is an arc-shaped flow guide part, the flow guide part comprises a first flow guide part 51 and a second flow guide part 52, the first flow guide part 51 and the second flow guide part 52 are sequentially connected, the first flow guide part 51 is provided with the arc-shaped groove, the first flow guide part 51 is arranged in an approximately equal thickness mode, and the second flow guide part 52 is arranged in a gradually reducing mode.
The invention relates to a high-efficiency pump device for boiler equipment, which can enable most of vortex generated at a tongue part 4 to flow along a second flow passage 7 through the design of a flow guide body 5 (a flow guide part and a rotating body 53), thereby inhibiting/reducing the vortex pulsation at the tongue part 4 and improving the stability maintaining performance of a pump.
Further, the rotation direction of the impeller 2 is counterclockwise, the rotation direction of the rotating body 53 is clockwise, and the radial gap width of the first flow channel 6 is smaller than the radial gap width of the corresponding second flow channel 7, so that different pressure differences are generated between the first flow channel 6 and the second flow channel 7, and the rotating body 53 rotates clockwise. Specifically, the pressure in the first flow passage 6 is greater than the pressure in the second flow passage 7.
Taking a connecting line of the middle point of the tongue portion 4 and the circle center O as an initial line, the central angle/fan-shaped angle a occupied by the flow guide body 5 along the circumferential direction is 35-65 degrees, preferably 50 degrees; the central/fan angle a is arranged substantially symmetrically about the Y axis.
Further, the rotating body 53 comprises a rotating shaft 54 and fins 55, wherein a plurality of uniformly distributed fins 55 are arranged on the periphery of the rotating shaft 54, and the fins 55 are arranged obliquely relative to the axis of the rotating shaft 54; the rotating body 53 is rotationally connected with the volute 1 through a bearing, and the rotating body 53 is driven to rotate passively under the drive of pressure difference of different pressures.
The present invention provides a high efficiency pump device for a boiler plant, which is capable of further causing most of the vortex generated at the tongue portion 4 to flow along the second flow path 7 by the design of the rotating body 53, thereby suppressing the pulsation of the vortex at the tongue portion 4 and improving the stability of the pump device.
The invention relates to a high-efficiency pump device for boiler equipment, which can enable most of vortex generated at a tongue part to flow along a second flow passage through the design of a flow guide body (a flow guide part and a rotating body), thereby inhibiting/reducing vortex pulsation at the tongue part and improving the stability maintaining performance of the pump device.
The above-described embodiments are illustrative of the present invention and not restrictive, it being understood that various changes, modifications, substitutions and alterations can be made herein without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims (6)
1. A high-efficiency pump device for boiler equipment comprises a boiler body (10), a burner (20), a combustion chamber (30), a heat exchanger (40), a pump device, a blower device, an exhaust device and a valve component, wherein the burner is arranged at one end of the boiler body, the combustion chamber and the heat exchanger are arranged in the boiler body, the pump device is connected with the boiler body through a pipeline, the blower device and the exhaust device are connected with the boiler body through a pipeline, the pump device comprises a volute (1), an impeller (2), an outlet pipe (3), a tongue part (4) and a flow guide body (5), the impeller is arranged in a volute cavity formed by the volute, the outlet end of the volute is provided with the outlet pipe, the tongue part is arranged at one side of the outlet pipe, which is connected with the volute, the flow guide body is arranged in the volute, which is close to the tongue part, the flow guide body is positioned between the inner wall of the volute and the periphery of the impeller, and a first flow channel (6) is formed between the flow guide body and the volute wall adjacent to the impeller, form second runner (7) between baffle and the impeller periphery, the centre of a circle of impeller (2) is O, crosses centre of a circle O and establishes X-Y axle coordinate system, and the Y axle is parallel with the central line of outlet pipe (3), its characterized in that: the flow guide body (5) comprises a flow guide part and a rotating body (53), the flow guide part is in a wing shape, an arc-shaped groove is formed in one end of the flow guide part, the rotating body is arranged in the arc-shaped groove, and the rotating body is rotatably connected with the volute.
2. A high efficiency pump apparatus for a boiler plant according to claim 1, wherein said flow guide portion is an arc-shaped flow guide portion, and the flow guide portion comprises a first flow guide portion (51) and a second flow guide portion (52), the first flow guide portion and the second flow guide portion are connected in sequence, the first flow guide portion has the arc-shaped groove, the first flow guide portion (51) is substantially in the same thickness, and the second flow guide portion (52) is in the tapered shape.
3. A high efficiency pump arrangement for a boiler plant according to claim 2, characterized in that the direction of rotation of the impeller (2) is counter clockwise and the direction of rotation of the rotational body (53) is clockwise, the radial gap width of the first flow channel (6) being smaller than the radial gap width of the corresponding second flow channel (7).
4. A high efficiency pump apparatus for a boiler plant according to claim 3, wherein different pressure differences are generated in the first flow passage (6) and the second flow passage (7) to rotate the rotary body (53) in a clockwise direction; the pressure in the first flow passage is greater than the pressure in the second flow passage.
5. A high efficiency pump unit for a boiler plant, as claimed in claim 4, characterized in that, starting from the line connecting the midpoint of the tongue (4) and the center O, the flow conductor (5) occupies in the circumferential direction a central angle a of 30-70 °, which central angle a is arranged substantially symmetrically with respect to the Y-axis.
6. A high efficiency pump device for boiler plant according to claim 5, characterized in that said rotating body (53) comprises a rotating shaft (54), a plurality of fins (55) being arranged on the periphery of the rotating shaft, the fins being arranged obliquely with respect to the axis of the rotating shaft; the rotating body (53) is rotatably connected with the volute (1) through a bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210185026.2A CN114608198B (en) | 2022-02-28 | 2022-02-28 | Efficient pump device for boiler equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210185026.2A CN114608198B (en) | 2022-02-28 | 2022-02-28 | Efficient pump device for boiler equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114608198A true CN114608198A (en) | 2022-06-10 |
| CN114608198B CN114608198B (en) | 2023-09-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210185026.2A Active CN114608198B (en) | 2022-02-28 | 2022-02-28 | Efficient pump device for boiler equipment |
Country Status (1)
| Country | Link |
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| CN (1) | CN114608198B (en) |
Citations (19)
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| DE733286C (en) * | 1935-09-14 | 1943-03-24 | Schuechtermann & Kremer Baum A | Pit fan |
| US5419680A (en) * | 1992-11-25 | 1995-05-30 | Nippondenso Co., Ltd. | Multi-blade blower |
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| CN101668954A (en) * | 2007-05-11 | 2010-03-10 | 三菱重工业株式会社 | Centrifugal blower |
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| CN110439862A (en) * | 2018-05-04 | 2019-11-12 | 宁波方太厨具有限公司 | A kind of volute structure of centrifugal blower |
| CN211623768U (en) * | 2019-12-02 | 2020-10-02 | 浙江金盾风机股份有限公司 | High-efficient centrifugal induced fan of big air current |
| CN111878459A (en) * | 2020-07-27 | 2020-11-03 | 珠海格力电器股份有限公司 | Volute, centrifugal fan and household appliance |
| CN211975415U (en) * | 2020-03-04 | 2020-11-20 | 武汉泰康翔科技股份有限公司 | High-efficient centrifugal water pump |
| CN112360805A (en) * | 2020-10-26 | 2021-02-12 | 江苏大学 | Novel asymmetric low-noise centrifugal pump |
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2022
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE520958C (en) * | 1928-02-08 | 1931-03-16 | Westfalia Dinnendahl A G | Blower with a simple spiral housing, which can be lengthened or shortened by moving the tip of the tongue |
| DE733286C (en) * | 1935-09-14 | 1943-03-24 | Schuechtermann & Kremer Baum A | Pit fan |
| US5419680A (en) * | 1992-11-25 | 1995-05-30 | Nippondenso Co., Ltd. | Multi-blade blower |
| US5772399A (en) * | 1993-12-21 | 1998-06-30 | American Standard Inc. | Apparatus and method for efficiency and output capacity matching in a centrifugal fan |
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| EP2275687A2 (en) * | 2009-07-17 | 2011-01-19 | Behr GmbH & Co. KG | Radial ventilator housing |
| CN103306985A (en) * | 2013-06-20 | 2013-09-18 | 江苏大学 | Low-noise hydraulic design method of centrifugal pump with low specific speed |
| CN205423324U (en) * | 2015-08-28 | 2016-08-03 | 依必安-派特穆尔芬根股份有限两合公司 | Propeller cap of radial fan |
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| CN106286400A (en) * | 2016-09-23 | 2017-01-04 | 东华大学 | A kind of bionical snail tongue with high-efficient low-noise multi-wing centrifugal fan |
| CN110088482A (en) * | 2016-12-20 | 2019-08-02 | 三菱电机株式会社 | Multiple-wing fan |
| CN206320047U (en) * | 2016-12-23 | 2017-07-11 | 克奥兹泵业（深圳）有限公司 | High-efficiency centrifugal pump |
| CN108240354A (en) * | 2017-12-27 | 2018-07-03 | 宁波方太厨具有限公司 | A kind of volute tongue and the centrifugal blower for being equipped with the volute tongue |
| CN110439862A (en) * | 2018-05-04 | 2019-11-12 | 宁波方太厨具有限公司 | A kind of volute structure of centrifugal blower |
| CN211623768U (en) * | 2019-12-02 | 2020-10-02 | 浙江金盾风机股份有限公司 | High-efficient centrifugal induced fan of big air current |
| CN211975415U (en) * | 2020-03-04 | 2020-11-20 | 武汉泰康翔科技股份有限公司 | High-efficient centrifugal water pump |
| CN111878459A (en) * | 2020-07-27 | 2020-11-03 | 珠海格力电器股份有限公司 | Volute, centrifugal fan and household appliance |
| CN112360805A (en) * | 2020-10-26 | 2021-02-12 | 江苏大学 | Novel asymmetric low-noise centrifugal pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114608198B (en) | 2023-09-01 |
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