CN105864103B - Diffuser structure - Google Patents
Diffuser structure Download PDFInfo
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- CN105864103B CN105864103B CN201610194292.6A CN201610194292A CN105864103B CN 105864103 B CN105864103 B CN 105864103B CN 201610194292 A CN201610194292 A CN 201610194292A CN 105864103 B CN105864103 B CN 105864103B
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- diffuser
- venturi
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- tube
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Abstract
A kind of diffuser structure provided by the invention, including diffuser interconnected and venturi straight tube, the central axis of the diffuser and the venturi straight tube is overlapped with the outer circle tangent line of spiral case annular channel, and along axis, upward tube section is dull increases to the diffuser outward.Beneficial effects of the present invention are as follows: 1, making fluid that can centainly be slowed down before entering trunnion straight way, flow losses when reducing into trunnion straight way.2, the flare design of diffuser is able to achieve close to parabolical profile and increases along the linear increase of diffuser axis cross section or the cross section of upstream slower, the cross section in downstream increases very fast.3, by the control to degree of deceleration, flow separation in caused pipe when can inhibit venturi flowing velocity distribution uneven to a certain degree, or delay flow separation lower downstream of flowing velocity in managing, to reduce flow losses in diffuser.
Description
Technical field
The present invention relates to a kind of design of diffuser, especially a kind of diffuser for tangent pump.
Background technique
Diffuser is the important component on tangent pump.Tangent pump uses annular volute mostly.Fluid does work through impeller
Afterwards, make preliminary deceleration first in the annular channel of spiral case, make further to slow down subsequently into diffuser, fluid is in moderating process
Middle kinetic energy is constantly converted into pressure energy, improves static pressure.
But existing tangent pump diffuser is designed using the straight line Taper Pipe of single cone angle.Since pump is arranged
The caliber of water out is generally fixed, and in the case where pumping the limited situation of overall dimension, diffuser is had to using relatively large cone
Angle, so as to cause flow separation serious in pipe and pitot loss.Even if size allow, diffuser pipe use experience recommend compared with
Conelet angle value, since flowing velocity distribution is uneven when fluid enters venturi from annular volute, so in most cases spreading
Still local flow separation and pitot loss can be generated in pipe, and flow separation point is close at the venturi of upstream, it is fast herein
Degree loses still very important to manage interior highest.
As shown in Figure 1, spiral case 1 is tangentially stretched out by a venturi straight tube 3 in regular section stream pump, bored with straight line
Shape diffuser 3 is connected to.Wherein 4 section of venturi straight tube is circle, tangent with the annular channel outer circle of spiral case 1.Come from One Dimension Analysis
It sees, the axially varying sectional area of straight line taper diffuser 3 is nonlinear.According to the conservation of mass, fluid expands along straight line taper
The axial flowing of separate tube 3 will first carry out the maximum retarded motion of acceleration, and then acceleration constantly reduces, and leave the diffusion of straight line taper
3 brief acceleration of pipe is minimum.Due to being exactly in bulk velocity when fluid makees most acutely to slow down in straight line taper diffuser 3
For highest state, therefore it will lead to serious flow separation loss.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide a kind of working performance more preferably diffuser structures.
In order to solve the above technical problems, a kind of diffuser structure provided by the invention, including diffuser interconnected and
Venturi straight tube, the diffuser and the central axis of the venturi straight tube and the outer circle tangent line of spiral case annular channel are overlapped, described
Along axis, upward tube section is dull increases to diffuser outward.
Preferably, coupling tube is connected in one end of the venturi straight tube, the coupling tube is bonded the spiral case annular channel
Inner wall.
Preferably, the coupling tube is using the center of circle for the impeller being arranged in the spiral case annular channel as the place in center of circle circle
Heart angle is less than 90 degree.
Preferably, the shape of the diffuser is tubaeform.
Compared with prior art, beneficial effects of the present invention are as follows:
1, make fluid that can centainly be slowed down before entering trunnion straight way, flowing damage when reducing into trunnion straight way
It loses.
2, the flare design of diffuser is able to achieve the line along diffuser axis cross section close to parabolical profile
Property increase or the cross section of upstream increases slower, the cross section in downstream increases very fast.
3, caused when can inhibit venturi flowing velocity distribution uneven to a certain degree by the control to degree of deceleration
Flow separation in managing, or delay flow separation lower downstream of flowing velocity in managing, to reduce flow losses in diffuser.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature mesh of the invention
And advantage will become more apparent upon.
Fig. 1 is prior art diffuser structure sectional view；
Fig. 2 is diffuser structure sectional view of the present invention.
In figure:
1- spiral case 2- impeller 3- diffuser
4- venturi straight tube 5- coupling tube
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention
Protection scope.
As shown in Fig. 2, the central axis of venturi straight tube 4 and diffuser 3 and the outer circle of 1 annular channel of spiral case are cut in the present invention
Line is overlapped.The shape flare of diffuser 3, but diffuse up 3 section of pipe outward along axis and keep dull increase.Due to larynx
Road straight tube 4 has partial cross section except the annular channel of annular volute 1, so one venturi inlet transforms pipe 5 of setting.Coupling tube 5
Size, corner centered on 2 shaft of impeller calculates, and is no more than 90 degree.
In present invention design, venturi inlet transforms pipe 5 therein expands the space of 1 annular channel of spiral case, and part increases
The radius for having added annular channel, compared with the conventional design in Fig. 1, so that fluid can centainly be slowed down before entering venturi,
Reduce flow losses when entering venturi straight tube 4.And the flare design of diffuser 3 can be real close to parabolical profile
Now increase along the linear increase of 3 axis cross section of diffuser or the cross section of upstream it is slower, the cross section in downstream increase compared with
Fastly.As a result it is exactly to make fluid even retardation or fluid in diffuser 3 slow down at upstream relatively to ease up, slows down at downstream
Relatively acutely.In this way by the control to degree of deceleration, can inhibit to cause when venturi flowing velocity distribution is uneven to a certain degree
Pipe in flow separation, or delay flow separation lower downstream of flowing velocity in managing, to reduce flowing damage in diffuser 3
It loses.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (1)
1. a kind of diffuser structure, including diffuser interconnected and venturi straight tube, the diffuser and the venturi straight tube
Central axis be overlapped with the outer circle tangent line of spiral case annular channel, which is characterized in that the diffuser is upward outward along axis
Tube section be dull increase；Coupling tube is connected in one end of the venturi straight tube, the coupling tube is bonded the spiral case annular
The inner wall of runner；
The coupling tube is the place central angle in the center of circle less than 90 using the center of circle for the impeller being arranged in the spiral case annular channel
Degree；
The shape of the diffuser is tubaeform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610194292.6A CN105864103B (en) | 2016-03-30 | 2016-03-30 | Diffuser structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610194292.6A CN105864103B (en) | 2016-03-30 | 2016-03-30 | Diffuser structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105864103A CN105864103A (en) | 2016-08-17 |
| CN105864103B true CN105864103B (en) | 2019-06-07 |
Family
ID=56626520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610194292.6A Active CN105864103B (en) | 2016-03-30 | 2016-03-30 | Diffuser structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105864103B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106593885B (en) * | 2016-11-22 | 2019-05-24 | 北京控制工程研究所 | A kind of space super-low specific speed centrifugal pump hydraulic model |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000291580A (en) * | 1999-04-08 | 2000-10-17 | Taisan Kogyo Kk | Drain pump for air-conditioning equipment |
| CN2491636Y (en) * | 2001-07-25 | 2002-05-15 | 上海凯泉泵业（集团）有限公司 | Combined modularized tangent pump |
| CN101865160A (en) * | 2010-07-08 | 2010-10-20 | 中国航天科技集团公司第六研究院第十一研究所 | Partial emission pump with low specific speed |
| CN201705730U (en) * | 2010-01-12 | 2011-01-12 | 上海连成（集团）有限公司 | Volute type structure of tangent pump body |
| CN204082647U (en) * | 2014-09-19 | 2015-01-07 | 上海丹博泵业有限公司 | A kind of vertical constant-pressure fire-fighting pump |
-
2016
- 2016-03-30 CN CN201610194292.6A patent/CN105864103B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000291580A (en) * | 1999-04-08 | 2000-10-17 | Taisan Kogyo Kk | Drain pump for air-conditioning equipment |
| CN2491636Y (en) * | 2001-07-25 | 2002-05-15 | 上海凯泉泵业（集团）有限公司 | Combined modularized tangent pump |
| CN201705730U (en) * | 2010-01-12 | 2011-01-12 | 上海连成（集团）有限公司 | Volute type structure of tangent pump body |
| CN101865160A (en) * | 2010-07-08 | 2010-10-20 | 中国航天科技集团公司第六研究院第十一研究所 | Partial emission pump with low specific speed |
| CN204082647U (en) * | 2014-09-19 | 2015-01-07 | 上海丹博泵业有限公司 | A kind of vertical constant-pressure fire-fighting pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105864103A (en) | 2016-08-17 |
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