CN112324711A - Volute with performance adjusting function and volute pump - Google Patents

Volute with performance adjusting function and volute pump Download PDF

Info

Publication number
CN112324711A
CN112324711A CN202011215557.9A CN202011215557A CN112324711A CN 112324711 A CN112324711 A CN 112324711A CN 202011215557 A CN202011215557 A CN 202011215557A CN 112324711 A CN112324711 A CN 112324711A
Authority
CN
China
Prior art keywords
volute
tongue
wall
pump
base circle
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.)
Pending
Application number
CN202011215557.9A
Other languages
Chinese (zh)
Inventor
董志强
沙玉俊
闵思明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KSB Shanghai Pump Co Ltd
Original Assignee
KSB Shanghai Pump Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by KSB Shanghai Pump Co Ltd filed Critical KSB Shanghai Pump Co Ltd
Priority to CN202011215557.9A priority Critical patent/CN112324711A/en
Publication of CN112324711A publication Critical patent/CN112324711A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0027—Varying behaviour or the very pump
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention discloses a volute casing with performance adjusting function and a volute casing pump, wherein the volute casing comprises: the outer wall of the outer wall is provided with a groove; an inner wall of the volute having a selectable base circle diameter; the impeller is arranged in the volute, and the base circle diameter of the inner wall is larger than the outer diameter of an outlet of the impeller, so that an annular gap is formed between the inner wall and the impeller; the movable partition tongue is arranged on the volute along an adjustable mounting angle and a helical angle; the tail part of the movable partition tongue is fixed at the groove, the head part of the partition tongue extends into the volute, and the base circle diameter is tangent to the head part of the movable partition tongue. The volute provided by the invention is provided with the partition tongue which can be rapidly detached, replaced and installed, the performance adjustment of the volute pump is realized by replacing the partition tongues with different design parameters, the operation area of the volute pump is expanded, and the operation stability of the volute pump is improved.

Description

Volute with performance adjusting function and volute pump
Technical Field
The present invention relates to a volute and a volute pump, and more particularly, to a volute and a volute pump having a performance adjusting function.
Background
The volute pump has the advantages of simple structure, superior performance, convenience in installation and maintenance and the like, and is widely applied to the fields of power generation, water supply, petrifaction and the like, wherein the volute is used as one of the most important flow passage components in the volute pump, the flow velocity of liquid is mainly reduced, the conversion from kinetic energy to pressure energy is realized, and the vortex loss of the liquid in the volute is reduced to the greatest extent.
However, when the operating condition of the pump deviates from the design condition by a certain interval, the flow velocity of the liquid at the outlet of the impeller and the flow velocity of the liquid in the volute are different and impact each other, so that the uniformity of the pressure in the impeller is damaged, the radial force and the hydraulic loss on the impeller are greatly increased, a series of problems such as unit vibration and performance reduction are caused, and finally the pump cannot operate.
A common volute structure is shown in CN205639047U, which has an outer wall, an inner wall and a partition. As shown in the drawing of CN205639047U, the partition is disposed inside the volute and is not adjustable. However, in practical engineering, the volute pump is often required to have a performance adjusting function so as to meet complex and variable operation conditions of a pipeline system.
In order to increase the stable operation range of the volute casing pump, the operating speed of the pump is usually regulated and controlled by adopting a scheme of matching a frequency converter with a variable frequency motor, so that the purpose of regulating the performance of the volute casing pump is realized.
Disclosure of Invention
In view of the above problems in the prior art, an object of the present invention is to provide a volute and a volute pump having a performance adjusting function.
In order to achieve the purpose, the invention adopts the following technical scheme:
a volute having performance tuning functionality, comprising: the outer wall of the volute is provided with a groove; an inner wall of the volute having a selectable base circle diameter; the movable partition tongue is arranged on the volute along an adjustable mounting angle and a helical angle; the tail part of the movable partition tongue is fixed at the groove, the head part of the partition tongue extends into the volute, and the base circle diameter is tangent to the head part of the movable partition tongue.
Further, the base circle diameter is 270-.
Furthermore, the setting angle of the movable separation tongue is 0-21 degrees.
Further, the spiral angle of the movable separation tongue is 0-27 degrees.
Further, a portion of the outer wall surface is a flat surface, and the groove is provided at the flat surface.
Furthermore, the groove is rectangular, a through hole is formed from the groove to the inner part of the volute, and the through hole is in an arc shape in the axial direction.
Furthermore, the whole of the baffle tongue is arc-shaped, and the shapes of the upper surface and the lower surface of the baffle tongue are consistent with the shape of the through hole in the volute.
To achieve the above object, the present invention includes a volute pump, which employs the volute of the present invention.
Further, the volute comprises an impeller, the impeller is arranged in the volute, the base circle diameter of the inner wall of the volute is larger than the outer diameter of an outlet of the impeller, and an annular gap is formed between the inner wall and the impeller.
In the technical scheme, the volute provided by the invention is provided with the partition tongue which can be rapidly detached, replaced and installed, the performance adjustment of the volute pump is realized by replacing the partition tongues with different design parameters, the operation interval of the volute pump is expanded, and the operation stability of the volute pump is improved.
Drawings
FIG. 1a is a schematic view of the volute of the present invention divided into several sections;
FIG. 1b is a second hydraulic schematic diagram of the volute of the present invention divided into several sections;
FIG. 2 is a schematic view of the volute parameters of the present invention;
FIGS. 3a-3c are schematic views of the movable partition tongue of the volute of the present invention;
fig. 4 is a graph illustrating the flow-head performance of the present invention;
FIG. 5 is a graph illustrating the flow-efficiency performance of the present invention;
fig. 6 and 7 are schematic views of the volute and the volute pump according to the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the embodiment.
Referring to fig. 1a, 1b and 2, the invention discloses a volute structure, wherein the integral outer wall of the volute 1 is in a circular arc shape, and the shape of the volute is similar to that of a shell of a snail, so that the volute is named as a 'volute'. The main structure of the volute 1 comprises an outer wall, an inner wall and a movable baffle tongue2. The outer wall of the volute 1 is fluted and the inner wall of the volute has an optional base diameter D3. Adjustable setting angle of movable partition tongue 2 edge
Figure RE-GDA0002809364150000021
Helix angle alpha0The movable partition tongue 2 is arranged in the volute, the tail part of the movable partition tongue 2 is fixed at the groove, the head part of the movable partition tongue 2 extends into the volute, and the base circle diameter is tangent to the head part of the movable partition tongue 2.
As shown in fig. 1, the spiral casing 1 has a water inlet and a water outlet, and the spiral casing 1 is divided into a plurality of sections, i to viii, based on the center point of the water inlet in fig. 1. The volute 1 has a partition tongue which is located between the sections i and viii. Fig. 1a, 1b and 2 show only one fixed position of the partition, but the partition 2 of the invention is movable, as will be described in more detail in the other subsequent figures.
As a preferred embodiment of the invention, as shown in FIG. 1a, FIG. 1b and FIG. 2, the cross section of the volute 1 near the tongue is a section I, and then a section II, a section III, a section IV, a section V, a section VI, a section VII and a section VIII are sequentially arranged along the counterclockwise direction. The 8 sections equally divide the volute into 8 parts, and the included angle of each part is 45 degrees. Each volute section is from the partition tongue to the outlet, the section between the partition tongues gradually changes, the smoothness of the whole wall surface of the volute can be guaranteed, each section molded line is composed of two straight lines and a circular arc, the shape is similar to a triangle, on one hand, the flow state of liquid in the volute is facilitated, on the other hand, the installation of the movable partition tongue 2 is facilitated due to the straight line area, the minimum clearance between the movable partition tongue 2 and the inner wall of the volute 1 is guaranteed, and the hydraulic loss caused by the overlarge clearance is effectively avoided.
With continued reference to fig. 1a and 1b, in the present embodiment, the diameter of the water outlet of the volute 1 is 150mm, and the diameters from the section I to the section viii are 138mm, 146mm, 153mm, 160mm, 168mm, 175mm and 178mm, respectively. It will be appreciated by those skilled in the art that the above dimensions are only one of many embodiments of the present invention, and that other sectional division and selection of volute dimensions may be made consistent with the spirit of the present invention.
As shown in fig. 2, the base circleDiameter D3, tongue spacer setting angle
Figure RE-GDA0002809364150000031
Angular angle alpha of partition tongue0Are three main parameters of volute design, the values of which are closely related to volute pump performance.
The volute pump also comprises an impeller, the impeller is arranged in the volute, and the base circle diameter of the inner wall of the volute is larger than the outer diameter of the outlet of the impeller, so that an annular gap is formed between the inner wall and the impeller. Specifically, the base circle diameter D3 is tangent to the tongue partition head, and its value is greater than the impeller exit external diameter, makes the annular clearance form between the two, and this clearance value size is very crucial to volute pump performance, and the clearance value undersize easily causes unit noise and vibration because of liquid stream jam, and the clearance value is too big, and its inside forms the liquid stream ring reinforcing, and the energy consumption increases, and unit efficiency descends.
Mounting angle of separation tongue
Figure RE-GDA0002809364150000032
The spiral line part in the volute is separated from the diffusion pipe part for forming an included angle between the radial plane of the head part of the movable partition tongue 2 and the VIII section, and the partition tongue is arranged at an angle
Figure RE-GDA0002809364150000033
The value of (d) is directly related to the smoothness of the connection of the helical line region with the diffusion section region.
Angular angle alpha of partition tongue0The included angle between the tangent line of the spiral line and the tangent line of the base circle and the helical angle alpha of the isolating tongue0The value of the pressure difference can effectively control the impact of the liquid on the movable partition tongue 2, so that the flow state of the liquid in the volute is more consistent with the flow rule.
Therefore, the invention mainly changes the base circle diameter D3 and the baffle mounting angle in the volute by replacing the movable baffle 2
Figure RE-GDA0002809364150000034
Angular angle alpha of partition tongue0Three main design parameters are adjusted, and the purpose of adjusting the performance of the volute casing pump is further achieved. Meanwhile, under different operating conditions, the base circle diameter D3 and the mounting angle of the isolating tongue
Figure RE-GDA0002809364150000035
Angular angle alpha of partition tongue0The optimal value and the optimal matching relationship among the three are changed, and the invention can realize D3,
Figure RE-GDA0002809364150000036
α0Optimizing and increasing the width of the high-efficiency area of the volute casing pump.
As a preferred embodiment of the invention, the selection range of the base circle diameter D3 is 270-290mm, and the partition tongue placing angle
Figure RE-GDA0002809364150000041
Is selected within the range of 0-21 DEG, and the angle alpha of the spiral angle of the isolating tongue0Is selected in the range of 0-27. It will be appreciated by those skilled in the art that the above parameter selections are only a few of the many embodiments of the present invention, other base diameters D3, and alternative tongue spacing angles
Figure RE-GDA0002809364150000042
And the angle alpha of the pitch angle of the partition tongue0The selection of the parameter ranges can also achieve the technical objects and technical effects of the present invention.
The invention uses the existing volute pump of a certain model as a contrast, the outer diameter of the impeller of the volute pump is 265mm, the rotating speed is 1450r/min, the original volute is cast integrally, the base circle diameter of the volute is 280mm, and the installation angle of the isolating tongue is set
Figure RE-GDA0002809364150000043
Is 7 degrees, and the angle alpha of the spiral angle of the isolating tongue0Is 8 deg..
As shown in fig. 3a-3c, the present invention designs the movable partition tongue 2 with different parameters to match with the outer wall 1 of the volute to replace the original volute. The scheme of the movable partition tongue 2 comprises 16 schemes, the diameter of a base circle matched with the scheme A, B, C, D is 270mm, the diameter of a base circle matched with the scheme E, F, G, H is 280mm, the diameter of a base circle matched with the scheme I, J, K, O is 290mm, and a partition tongue mounting angle
Figure RE-GDA0002809364150000044
Angular angle alpha of partition tongue0As shown in fig. 3a-3 c.
Scheme A:
the base circle diameter D3 is 270mm, and the mounting angle of the isolating tongue
Figure RE-GDA0002809364150000045
Is 0 DEG, and the angle alpha of the spiral angle of the isolating tongue0Is 7 deg..
Scheme B:
the base circle diameter D3 is 270mm, and the mounting angle of the isolating tongue
Figure RE-GDA0002809364150000046
Is 7 degrees, and the angle alpha of the spiral angle of the isolating tongue0Is 14 deg..
Scheme C:
the base circle diameter D3 is 270mm, and the mounting angle of the isolating tongue
Figure RE-GDA0002809364150000047
Is 14 degrees, and the angle alpha of the spiral angle of the isolating tongue0Is 21 deg..
Scheme D:
the base circle diameter D3 is 270mm, and the mounting angle of the isolating tongue
Figure RE-GDA0002809364150000048
Is 21 degrees, and the angle alpha of the spiral angle of the isolating tongue0Is 27 deg..
Scheme E:
the base circle diameter D3 is 280mm, and the mounting angle of the isolating tongue
Figure RE-GDA0002809364150000049
Is 0 DEG, and the angle alpha of the spiral angle of the isolating tongue0Is 1 deg..
Scheme F:
the base circle diameter D3 is 280mm, and the mounting angle of the isolating tongue
Figure RE-GDA00028093641500000410
Is 7 degrees, and the angle alpha of the spiral angle of the isolating tongue0Is 8 deg..
Scheme G:
the base circle diameter D3 is 280mm, and the mounting angle of the isolating tongue
Figure RE-GDA00028093641500000411
Is 14 degrees, and the angle alpha of the spiral angle of the isolating tongue0Is 12 deg..
Scheme H:
the base circle diameter D3 is 280mm, and the mounting angle of the isolating tongue
Figure RE-GDA00028093641500000412
Is 21 degrees, and the angle alpha of the spiral angle of the isolating tongue0Is 14 deg..
Scheme I:
the base circle diameter D3 is 290mm, and the mounting angle of the isolating tongue is
Figure RE-GDA00028093641500000413
Is 0 DEG, and the angle alpha of the spiral angle of the isolating tongue0Is 0 deg..
Scheme J:
the base circle diameter D3 is 290mm, and the mounting angle of the isolating tongue is
Figure RE-GDA00028093641500000414
Is 7 degrees, and the angle alpha of the spiral angle of the isolating tongue0Is 2 deg..
Scheme K:
the base circle diameter D3 is 290mm, and the mounting angle of the isolating tongue is
Figure RE-GDA0002809364150000051
Is 14 degrees, and the angle alpha of the spiral angle of the isolating tongue0Is 4 deg..
Scheme O:
the base circle diameter D3 is 290mm, and the mounting angle of the isolating tongue is
Figure RE-GDA0002809364150000052
Is 21 degrees, and the angle alpha of the spiral angle of the isolating tongue0Is 7 deg..
From the above list, it can be seen that the solution F is consistent with the parameters of the original volute and the partition tongue thereof, but it is obvious that the technical solution of the present invention can provide the base circle diameter D3 and the partition tongue mounting angle under various parameters
Figure RE-GDA0002809364150000053
Angular angle alpha of partition tongue0Selection of (2). Therefore, compared with the non-adjustable partition tongue in the prior art, the volute and the volute pump thereof can realize the parameter adjustment of the movable partition tongue in the same volute and volute pump.
On the other hand, those skilled in the art will understand that the base diameter D3, the tongue spacing angle, and the like are described above
Figure RE-GDA0002809364150000054
Angular angle alpha of partition tongue0The parameter combination mode of the invention is only a plurality of choices among a plurality of embodiments of the invention, other base circle diameter D3 and the setting angle of the movable baffle 2
Figure RE-GDA0002809364150000055
And the movable isolation tongue 2 helix angle alpha0The technical purpose and the technical effect of the invention can be realized by selecting the parameter combination mode.
Referring to the flow-head performance curve of fig. 4 and the flow-efficiency performance curve of fig. 5, wherein the cross-hatched area is the above scheme a-O performance curve distribution interval. As can be seen from fig. 4 and 5: compared with the original volute, the invention increases the operation interval of the volute pump by replacing the movable partition tongues 2 with different parameters, and the maximum adjustment range of the lift can reach 11% under the same operation condition. On the other hand, the width of the high-efficiency area of the volute and the volute pump is also enlarged, and the high-efficiency area is enlarged by 15% by taking the efficiency value of 85% as a reference.
Referring to fig. 6 and 7, as a preferred embodiment of the present invention, the outer wall 1 of the volute of the present invention has a plane from the second section to the diffuser section, the plane being tangential to the second section, and a rectangular groove being formed on the plane.
As shown in fig. 6 and 7, threaded holes are processed around the groove, the movable partition tongue 2 is positioned through a spigot of the rectangular groove and fixed on the outer wall 1 of the volute through a screw 4, and the sealing performance between the movable partition tongue and the volute is ensured through a sealing gasket 5. The through hole is processed from the groove of the volute to the inside of the volute, and the through hole is in an arc shape in the axial direction, so that the installation and the disassembly of the movable partition tongue 2 are facilitated, and the later maintenance and the overhaul are facilitated.
With continued reference to fig. 6 and 7, the movable partition tongue 2 is arc-shaped as a whole, and the shapes of the upper surface and the lower surface of the partition tongue are consistent with the shape of the through hole in the volute, that is, the upper surface and the lower surface of the partition tongue are provided with the inclined planes consistent with the inside of the volute, so that the gap between the movable partition tongue 2 and the inner wall of the volute can be ensured to be minimized.
In summary, the volute and the volute pump of the invention have the following advantages:
1. the invention has simple structure, low cost and better economy;
2. the volute can be directly disassembled, replaced and installed without disassembling the pump and the pipeline, and has better operability and maintainability;
3. compared with the conventional volute, the volute provided by the invention has the advantages that the volute adjusts the performance of the pump by installing the partition tongues with various design parameters, and the operation interval and the operation stability of the volute pump are greatly increased.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.

Claims (9)

1. A spiral casing having a performance adjusting function, comprising:
the outer wall of the volute is provided with a groove;
an inner wall of the volute having a selectable base circle diameter;
the movable partition tongue is arranged on the volute along an adjustable mounting angle and a spiral angle;
the tail part of the movable partition tongue is fixed at the groove, the head part of the partition tongue extends into the volute, and the base circle diameter is tangent to the head part of the movable partition tongue.
2. The spiral casing with performance adjusting function as claimed in claim 1, wherein:
the diameter of the base circle is 270-290 mm.
3. The spiral casing with performance adjusting function as claimed in claim 1, wherein:
the setting angle of the movable isolating tongue is 0-21 degrees.
4. The spiral casing with performance adjusting function as claimed in claim 1, wherein:
the spiral angle of the movable partition tongue is 0-27 degrees.
5. The spiral casing with performance adjusting function as claimed in claim 1, wherein:
a portion of the outer wall surface is a plane, the groove being disposed at the plane.
6. The spiral casing with performance adjusting function as claimed in claim 5, wherein:
the groove is rectangular, a through hole is formed from the groove to the inner part of the volute, and the through hole is arc-shaped in the axial direction.
7. The spiral casing with performance adjusting function as claimed in claim 5, wherein:
the whole of the partition tongue is arc-shaped, and the shapes of the upper surface and the lower surface of the partition tongue are consistent with the shape of the through hole in the volute.
8. A volute pump, wherein the volute pump comprises a volute according to any of claims 1-7.
9. The volute pump having performance tuning capability of claim 8, further comprising:
the impeller is arranged in the volute, and the base circle diameter of the inner wall of the volute is larger than the outer diameter of an outlet of the impeller, so that an annular gap is formed between the inner wall and the impeller.
CN202011215557.9A 2020-11-04 2020-11-04 Volute with performance adjusting function and volute pump Pending CN112324711A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011215557.9A CN112324711A (en) 2020-11-04 2020-11-04 Volute with performance adjusting function and volute pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011215557.9A CN112324711A (en) 2020-11-04 2020-11-04 Volute with performance adjusting function and volute pump

Publications (1)

Publication Number Publication Date
CN112324711A true CN112324711A (en) 2021-02-05

Family

ID=74323604

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011215557.9A Pending CN112324711A (en) 2020-11-04 2020-11-04 Volute with performance adjusting function and volute pump

Country Status (1)

Country Link
CN (1) CN112324711A (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1209509A (en) * 1997-08-27 1999-03-03 赵廷舫 Method for increasing pumping-effciency and reducing specific gravity
CN2316496Y (en) * 1997-08-31 1999-04-28 赵廷舫 Changeable isolation tongue type pump body core
CN201996504U (en) * 2011-01-18 2011-10-05 德昌电机(深圳)有限公司 Washing device
CN105673571A (en) * 2016-02-26 2016-06-15 江苏大学 Hydraulic design method of efficient large-overflowing rotational flow pump quasi-circular water-compressing chamber
CN107503985A (en) * 2017-09-21 2017-12-22 上海上涵自动化科技有限公司 Receded disk impeller machinery
CN108612675A (en) * 2018-05-02 2018-10-02 上海上涵自动化科技有限公司 A kind of adjustable volute casing device
CN110966245A (en) * 2019-12-18 2020-04-07 珠海格力电器股份有限公司 Pump body structure for reducing hydraulic excitation and centrifugal pump
CN211116804U (en) * 2019-11-19 2020-07-28 浙江理工大学 Centrifugal pump volute with changeable flow channel shape
CN111765124A (en) * 2020-06-23 2020-10-13 西安航空学院 But angle of adjustment's spiral case spacer tongue subassembly and fuel centrifugal pump

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1209509A (en) * 1997-08-27 1999-03-03 赵廷舫 Method for increasing pumping-effciency and reducing specific gravity
CN2316496Y (en) * 1997-08-31 1999-04-28 赵廷舫 Changeable isolation tongue type pump body core
CN201996504U (en) * 2011-01-18 2011-10-05 德昌电机(深圳)有限公司 Washing device
CN105673571A (en) * 2016-02-26 2016-06-15 江苏大学 Hydraulic design method of efficient large-overflowing rotational flow pump quasi-circular water-compressing chamber
CN107503985A (en) * 2017-09-21 2017-12-22 上海上涵自动化科技有限公司 Receded disk impeller machinery
CN108612675A (en) * 2018-05-02 2018-10-02 上海上涵自动化科技有限公司 A kind of adjustable volute casing device
CN211116804U (en) * 2019-11-19 2020-07-28 浙江理工大学 Centrifugal pump volute with changeable flow channel shape
CN110966245A (en) * 2019-12-18 2020-04-07 珠海格力电器股份有限公司 Pump body structure for reducing hydraulic excitation and centrifugal pump
CN111765124A (en) * 2020-06-23 2020-10-13 西安航空学院 But angle of adjustment's spiral case spacer tongue subassembly and fuel centrifugal pump

Similar Documents

Publication Publication Date Title
US3788765A (en) Low specific speed compressor
US6736594B2 (en) Axial-flow type hydraulic machine
US8240976B1 (en) Methods and apparatus for centrifugal pumps utilizing head curve
RU2491444C1 (en) Direct-connection mixed-flow slow-speed small-sized hydraulic turbine used in hydrodynamic power-saving quenching tower
CN105485022B (en) Sectional multi-stage centrifugal pump
US5248224A (en) Orificed shroud for axial flow fan
GB1045219A (en) Centrifugal gas or liquid pump
US20130034425A1 (en) Method for adapting the air flow of a turbine engine having a centrifugal compressor and diffuser for implementing same
US20160238019A1 (en) Gas pipeline centrifugal compressor and gas pipeline
US20210262488A1 (en) Ventilator and deflector plate for a ventilator
US20120308372A1 (en) Centrifugal compressor having an asymmetric self-recirculating casing treatment
WO2011036459A1 (en) Diffuser
KR20140136382A (en) Pull-out type vertical pump
JP2008175124A (en) Centrifugal compressor
JP2014109193A (en) Centrifugal fluid machine
CN114352573B (en) Compact centrifugal fan
JP2011111958A (en) Water turbine stay vane and water turbine
CN112324711A (en) Volute with performance adjusting function and volute pump
JP2012184758A (en) Rotary machine
US9534601B2 (en) Pump
US20070009352A1 (en) Method and device for reducing pressure fluctuations in an induction pipe of a water turbine or water pump or water-pump turbine
JP2017048703A (en) Centrifugal Pump
JP2001271779A (en) Horizontal shaft pump with helical blade
CN111692131A (en) Compressor and inlet guide vane device thereof
CN218493883U (en) Centrifugal compressor and diffuser based on half-height blades thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20210205

RJ01 Rejection of invention patent application after publication