CN103306986B - Multistage pump - Google Patents
Multistage pump Download PDFInfo
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- CN103306986B CN103306986B CN201310071431.2A CN201310071431A CN103306986B CN 103306986 B CN103306986 B CN 103306986B CN 201310071431 A CN201310071431 A CN 201310071431A CN 103306986 B CN103306986 B CN 103306986B
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- middle housing
- fixed mechanism
- housing cover
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- multistage
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- 230000007246 mechanism Effects 0.000 claims abstract description 43
- 239000007788 liquid Substances 0.000 claims description 27
- 238000004519 manufacturing process Methods 0.000 abstract description 4
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- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
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- 238000009792 diffusion process Methods 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000010298 pulverizing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- 229910001220 stainless steel Inorganic materials 0.000 description 1
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- 239000000126 substance Substances 0.000 description 1
Abstract
The present invention provides a kind of multistage pump, and it can reduce middle housing and reduce manufacturing cost it is not necessary to be used for the run through bolt of connection secured to one another for middle housing, can easily decompose middle housing further.The multistage pump of the present invention has：Multi-stage impeller (2)；The multistage middle housing (3A～3D) of storage impeller (2)；The middle housing cover (20) of storage middle housing (3A～3D)；Surround the outside housing (8) of middle housing (3A～3D) and middle housing cover (20)；With the fixed mechanism (23,31) being fixed on middle housing cover (20) on middle housing (3A～3D).
Description
Technical field
The present invention relates to the multistage pump of transfer liquid, the high-pressure multi-stage pump of liquid more particularly, to can be transferred with high pressure.
Background technology
As the pump that can transfer liquid with the high pressure of several MPa～tens of MPa, there is high-pressure multi-stage pump.High-pressure multi-stage
Pump is used in various uses, for example, is used in transfer dangerous liquid with high pressure.In such pump, in order to bear liquid
High pressure and make liquid will not drain to outside, employ the outside of housing arrange further housing double Shell construction.
Fig. 1 is the sectional view representing existing high-pressure multi-stage pump.As shown in figure 1, high-pressure multi-stage pump has being fixed on axle 1
Multiple impellers 2.It is configured with multiple middle housings 3 in the way of surrounding impeller 2.It is configured with the inside of each middle housing 3 and lead
Leaf 5 will be such that it is able to the impeller 2 to next stage will be guided by the liquid that impellers 2 at different levels have boosted.Middle housing 3 (axle vertically
1 bearing of trend) overlapping, these middle housings 3 are interfixed by multiple run through bolts 50.And, to surround these
The mode of middle housing 3 is also configured with outside housing 8.Suction inlet 9 and the outlet 10 of liquid are provided with outer side body 8.By
These middle housings 3 and outside housing 8 constitute double Shell construction.
The end of axle 1 is linked with driving machine (such as motor) (not shown), so that impeller 2 is rotated by this driving machine.Work as leaf
During wheel 2 rotation, liquid is sucked from suction inlet 9 and is guided to impeller 2, is boosted successively by each impeller 2.Middle housing 3
Space and outside housing 8 between is filled with the liquid after boosting, and liquid is discharged from outlet 10.So, middle housing 3 has
Play the role of by boosting way in liquid and boosting after liquid separation open, outside housing 8 have prevent boost after liquid to
The effect of External leakage.
Fig. 2 is the schematic sectional view of the part representing the high-pressure multi-stage pump shown in Fig. 1.As shown in Fig. 2 series and impeller
2 series identical middle housing 3A～3D overlaps.Alignment pin 7 is installed between each middle housing and stator 5, by this
Alignment pin 7 is fixing the relative position of middle housing 3A～3D and stator 5.The end face of piece housing 3A and outer shell in the first stage
It is configured with pad 14 between body 8.It is adjacent to final stage middle housing 3D and be configured with diffuser ring 12, in the inside of this diffuser ring 12,
It is formed with bubbler (diffuser) 13 in the way of surrounding impeller 2.Middle housing 3A～3D and diffuser ring 12 are by many
Individual run through bolt 50 (illustrate only a run through bolt 50 in fig. 2) and be mutually fastenedly connected.
But, in the construction shown in Fig. 2, due to having to be formed run through bolt 50 on middle housing 3A～3D
Screwed hole and through hole, so have the shortcomings that middle housing 3A～3D itself becomes big and pump overall weight increases and stage casing
The shortcoming that the fee of material of housing 3A～3D uprises.
Therefore, as shown in figure 3, proposing to have to will pass through bolt 50 and configure the construction outside middle housing.In this configuration,
Piece housing 3A and diffuser ring 12 are provided with flange 3a, 12a in the first stage, be respectively formed with and run through spiral shell on this flange 3a, 12a
The screwed hole of bolt and through hole.Therefore, it is possible to reduce other middle housings 3B～3D, pump weight saving, and then middle housing
The fee of material of 3B～3D also can mitigate.But, because run through bolt 50 is located at middle housing 3B～between 3D and outside housing 8
Space in, so there is following situation：Lead to run through spiral shell due to the flowing of the liquid after filling boosting within this space
Bolt 50 is corroded, or leads to run through bolt 50 to sustain damage due to fluid oscillation.
Fig. 4 is that other that represent middle housing are fastenedly connected the figure of construction, employs shrink fit in this configuration.In heat
In press-fit, make the side in adjacent two middle housing be heated to high temperature in stove and be allowed to expand, so that this fitting portion
15a becomes big.In this condition, promptly the fitting portion 15b of the opposing party's middle housing of low temperature is inserted into the stage casing shell of expansion
In the fitting portion 15a of body.With the temperature drop of the middle housing after heating, the fitting portion 15a in outside is close to the embedding of inner side
Conjunction portion 15b, two thus adjacent middle housings are fastenedly connected.Only needed by such shrink fit be repeated
Series just can constitute multistage middle housing 3A～3D.Constructed by this shrink fit, can reduce middle housing 3A～3D's
Diameter, and also can reduce the diameter of outside housing 8.
But, for shrink fit, need the stove for implementing shrink fit, and expend expense to heat middle housing
With and the time.Therefore, the overall manufacturing cost of pump rises.And, in the case that pump breaks down, in order to unload stage casing shell
Body is it is necessary to use the burners such as pulverizing jet (burner).According to the setting scene of pump, there is the situation (example not allowed using fire
As chemical plant etc.), it is impossible to use burner in such setting scene.Therefore, it is impossible to send out in this setting spot repair
Give birth to the pump of fault it is necessary to pump is carried to factory.
Prior art literature
Patent documentation 1：Japanese Unexamined Patent Publication 2004-360653 publication
Patent documentation 2：Japanese Unexamined Patent Publication 9-88864 publication
Content of the invention
The present invention researches and develops to solve above-mentioned existing problem points, its object is to provide a kind of multistage pump, should
Multistage pump can reduce middle housing and reduce manufacturing cost it is not necessary to by the run through bolt of connection secured to one another for middle housing,
Middle housing can also be made easily to decompose.
To achieve these goals, a mode of the present invention is that a kind of multistage pump is it is characterised in that have：Multistage leaf
Wheel；Receive the multistage middle housing of described impeller；Receive the middle housing cover of described middle housing；Surround described middle housing and
The outside housing of described middle housing cover；With the fixed mechanism being fixed on described middle housing cover on described middle housing.
The optimal way of the present invention is characterised by, described middle housing cover is drum.
The optimal way of the present invention is characterised by, described fixed mechanism has：Fixing described middle housing cover with described
1st fixed mechanism of the relative position of middle housing；The fixing machine with the 2nd of fixing described middle housing the relative position of each other the
Structure.
The optimal way of the present invention is characterised by, described 1st fixed mechanism fixes described middle housing cover and the first order
The relative position of middle housing, described 2nd fixed mechanism makes described middle housing by pushing final stage middle housing vertically
Connection secured to one another.
The optimal way of the present invention is characterised by, described 1st fixed mechanism has：It is formed at described first order stage casing shell
The 1st screwed hole on body；The 1st screw element screwing togather with the 1st screwed hole；Be formed on described middle housing cover and for described
The through hole that 1st screw element passes through.
The optimal way of the present invention is characterised by, described 1st fixed mechanism has：It is formed at described first order stage casing shell
On body and there is the 1st screwed hole of taper chimeric surface；Have the taper surface chimeric with described taper chimeric surface and with described 1st spiral shell
The 1st screw element that pit screws togather；With the through hole being formed on described middle housing cover and pass through for described 1st screw element.
The optimal way of the present invention is characterised by, described 1st fixed mechanism has：It is formed at described first order stage casing shell
Jut on body；With the holding section being formed on described middle housing cover and having the shape for the engaging of described jut.
The optimal way of the present invention is characterised by, described 2nd fixed mechanism has：It is formed on described middle housing cover
The 2nd screwed hole push part adjacent with described final stage middle housing and screw togather with described 2nd screwed hole and will be described
Push part is pressed to the 2nd screw element on described final stage middle housing.
The optimal way of the present invention is characterised by, has been internally formed bubbler in described push part.
The optimal way of the present invention is characterised by, described 1st fixed mechanism is fixed in described middle housing cover and final stage
The relative position of piece housing, described 2nd fixed component makes described middle housing by pushing first order middle housing vertically
Connection secured to one another.
Brief description
Fig. 1 is the sectional view representing existing high-pressure multi-stage pump.
Fig. 2 is the schematic sectional view of the part representing the high-pressure multi-stage pump shown in Fig. 1.
Fig. 3 is the schematic sectional view of the other examples representing existing high-pressure multi-stage pump.
Fig. 4 is the schematic sectional view of the still other example representing existing high-pressure multi-stage pump.
Fig. 5 is the schematic sectional view of a part for an embodiment for the multistage pump representing the present invention.
Fig. 6 is the schematic diagram for middle housing and the assembling of middle housing cover are described.
(a) of Fig. 7 be represent from end on observation to middle housing cover figure, (b) of Fig. 7 is the section view of middle housing cover
Figure.
Fig. 8 is to be denoted as the sectional view that the 1st screw element employs the example of tapered thread part with taper surface.
(a) of Fig. 9 is the figure of the 1st screw element representing and having taper surface and the 1st screwed hole with taper chimeric surface, figure
9 (b) is to represent that the 1st screw element is screwed on the state in the 1st screwed hole.
Figure 10 is the schematic sectional view of a part for the high-pressure multi-stage pump of the other modes representing the present invention.
(a) of Figure 11 be represent from end on observation to middle housing cover figure, (b) of Figure 11 is cuing open of middle housing cover
View.
(a) of Figure 12 is the top view of the holding section representing middle housing cover, and (b) of Figure 12 is to represent to be fastened on holding section
On jut top view.
The explanation of reference
1 axle
2 impellers
3A～3D middle housing
5 stators
7 alignment pins
8 outside housings
9 suction inlets
10 outlets
12 diffuser rings (pressing component)
13 bubblers
14 pads
15 fitting portions
20 middle housing covers
21 flange parts
23 the 1st fixed mechanisms
24th, 24 ' the 1st screw element
25 through holes
26th, 26 ' the 1st screwed hole
27 juts
28 holding sections (incised notch portion)
31 the 2nd fixed mechanisms
32 the 2nd screw elements
33 the 2nd screwed holes
50 run through bolts
Specific embodiment
Hereinafter, with reference to the accompanying drawings of embodiments of the present invention.
Fig. 5 is the schematic sectional view of a part for the multistage pump representing an embodiment of the invention.Due to axle 1, leaf
Wheel 2, the structure of stator 5 are identical with the structure shown in Fig. 1 to Fig. 4, so omitting its repeat specification.
As shown in figure 5, it is series is overlapping with impeller 2 series identical middle housing 3A, 3B, 3C, 3D, in each middle housing
Alignment pin 7 is installed and stator 5 between, fixes the relative position of middle housing 3A～3D and stator 5 by this alignment pin 7.
It is adjacent to final stage middle housing 3D and be provided with diffuser ring 12.In the inside of this diffuser ring 12, shape in the way of surrounding impeller 2
Become to have bubbler 13.
In the present embodiment, it is not provided with the run through bolt for being fastenedly connected middle housing 3A～3D, replace
It is provided with middle housing cover 20.This middle housing cover 20 is fixed on stage casing by the 1st fixed mechanism 23 and the 2nd fixed mechanism 31
On housing 3A～3D.Middle housing cover 20 has drum, and middle housing 3A～3D is incorporated in middle housing cover 20.With
Surround middle housing 3A～3D and the mode of middle housing cover 20 is provided with outside housing 8.
The end of axle 1 is linked with driving machine (such as motor) (not shown), so that impeller 2 is rotated by this driving machine.Work as leaf
During wheel 2 rotation, liquid is sucked from suction inlet 9 and is directed to impeller 2, is boosted successively by each impeller 2.Middle housing
Space between cover 20 and outside housing 8 is filled with the liquid after boosting, and liquid is discharged from outlet 10.
It is configured with the pad 14 of ring-type in the first stage between the end face of piece housing 3A and outside housing 8.By impeller 2
Diffuser ring 12 and middle housing 3A～3D are pressed to suction side, by this first order middle housing 3A's by the liquid rotating and boosting
End face presses against pad 14 on the housing 8 of outside.So, it is clipped in the pad between first order middle housing 3A and outside housing 8
14 are flowed into the sealing gasket of suction side region as the liquid preventing after boosting and play a role.
Fig. 6 is the schematic diagram of the assembling for middle housing cover 20 is described, (a) of Fig. 7 be from end on observation to stage casing
The figure of case cover 20, (b) of Fig. 7 is the sectional view of middle housing cover 20.The outer peripheral face of piece housing 3A is formed with the first stage
Multiple 1st screwed holes 26 screwing togather for the 1st screw element 24.The perisporium of middle housing cover 20 is formed with for the 1st screw element 24
The multiple through holes 25 passing through.The flange part 21 extending inside its perisporium is to radial direction is formed with middle housing cover 20,
Multiple 2nd screwed holes 33 are formed with these flange parts 21.Multiple through holes 25 are located at the one end of middle housing cover 20, flange
Portion 21 and multiple 2nd screwed hole 33 are positioned at the other end of middle housing cover 20.
As shown in fig. 6, on the middle housing 3A～3D along axle 1 overlap, being coated with the middle housing cover 20 of cylindrical shape.?
Under this state, so that the 1st screw element 24 is inserted in the 1st screwed hole 26 by through hole 25, make the 1st screw element 24 and the 1st screw thread
Hole 26 screws togather until the head of the 1st screw element 24 is located in through hole 25.Thus, middle housing cover 20 and first order middle housing 3A
Relative position fixed.So, the 1st screw element 24, the 1st screwed hole 26 and through hole 25 constitute for fixing middle housing
1st fixed mechanism 23 of the relative position of cover 20 and middle housing 3A.
And, diffuser ring 12 is arranged on the side of final stage middle housing 3D, in this condition, so that the 2nd screw element 32 is led to
Cross the through hole 12a of diffuser ring 12 and be inserted in the 2nd screwed hole 33, and fasten these the 2nd screw elements 32, thus, by diffusion
Ring 12 pushes final stage middle housing 3D vertically.Thus, middle housing 3A～3D mutually tightens together.2nd screw element 32, expansion
The through hole 12a of scattered ring 12 and the 2nd screwed hole 33 are axially extending along axle 1.Therefore, by fastening the 2nd screw element 32, diffuser ring
12 can push final stage middle housing 3D as push part to first order middle housing 3A.Its result is, middle housing 3A
～3D mutually tightens together.That is, clamp between piece housing 3A and diffuser ring 12 in the first stage other middle housings 3B, 3C,
3D.So, the 2nd screw element 32, diffuser ring 12 and the 2nd screwed hole 33 constitute the relative position for fixing middle housing 3A～3D
The 2nd fixed mechanism 31 put.
As shown in figure 8, can also be using the screw element (tapered thread part) 24 ' with taper surface as the 1st screw element.Ginseng
(b) of (a) according to Fig. 9 and Fig. 9 illustrates to the 1st screw element 24 '.As shown in (a) of Fig. 9 and (b) of Fig. 9, the 1st screw thread
Part 24 ' has the taper surface 24c ' between its head 24a ' and external thread part 24b '.1st screwed hole 26 ' has at an upper portion thereof
There is taper chimeric surface (spot-facing) 26a ', under this taper chimeric surface 26a ', be formed with internal thread part 26b '.Taper chimeric surface
26a ' has shape corresponding with the shape of taper surface 24c '.
As shown in (b) of Fig. 9, after the 1st screw element 24 ' is screwed into 1 screwed hole 26 ', taper surface 24c ' is chimeric with taper
Face 26a ' is fitted together to.So, taper surface 24c ' is integrally crimped on taper chimeric surface 26a ', in more reliably fixing
Piece housing cover 20 and the relative position of first order middle housing 3A.It is additionally, since and can be fitted together to by taper surface 24c ' and taper
Face 26a ' bearing along the middle housing 3A～3D of axle 1 overlap and the weight of diffuser ring 12, so being also advantageous that in terms of intensity
's.
The liquid being boosted by the impeller 2 of rotation is not only contacted with the outer peripheral face of middle housing cover 20, also with its inner circumferential
Face contacts, and therefore, is nearly free from the stress being caused by highly pressurised liquid on middle housing cover 20.Therefore, there is no need to make stage casing
Case cover 20 has the big intensity as pressure-proof components, but can be formed relatively thin by middle housing cover 20.And, in pump fortune
In turning, push the back side of diffuser ring 12 to suction side because the liquid after boosting is full of the posterior region of diffuser ring 12, so
Middle housing 3A～3D is mutually tightened together by the pressure of liquid.It is therefore not necessary to by the 2nd screw element 32 come to stage casing
Housing 3A～3D carries out strong fastening.In addition, the liquid after can also being provided for making boosting on middle housing cover 20 is isobaric
Through hole.
Middle housing cover 20 and diffuser ring 12 are by corrosion resistances such as 13Cr alloy, rustless steel, Ni class alloy, two phase stainless steels
High metal or metal alloy is made.Middle housing cover 20 can also be formed according to the use environment of pump with carbon steel.And,
In addition to metal, it is possible to use pottery, or the composites such as carbon fiber can also be used.
According to present embodiment, the run through bolt as not needing illustrated by Fig. 2 and Fig. 3, it is possible to reducing
The size of middle housing 3A～3D.Therefore, it is possible to realize the reduction of the overall lightweight of pump and production cost.Further, since not
Using run through bolt, so the problem that run through bolt is corroded will not be produced.It is additionally, since only dismounting the 1st screw element 24 or 24 '
And the 2nd screw element 32 just can easily decompose middle housing 3A～3D, it is possible to pump setting scene carry out pump point
Solution and repairing.Therefore, it is possible to reduce the maintenance cost of pump.
Figure 10 is the schematic sectional view of a part for the high-pressure multi-stage pump of the other embodiment representing the present invention.Real at this
Apply in mode, be not provided with the screw element for fixing middle housing cover 20 and first order middle housing, replace, the 1st
The outer peripheral face of middle housing 3A is provided with multiple juts 27, and is provided with multiple holding sections (incised notch portion) on middle housing cover 20
28, these holding sections 28 have the shape for the engaging of above-mentioned jut 27.In this embodiment, by jut 27 and holding section
28 the 1st fixed mechanisms 23 constituting fixing middle housing cover 20 and the relative position of middle housing 3A.2nd fixed mechanism 31 with
The 2nd fixed mechanism 31 in above-mentioned embodiment is identical.
(a) of Figure 11 represent be from end on observation to middle housing cover 20 figure, (b) of Figure 11 is middle housing cover 20
Sectional view.(a) of Figure 12 is the top view of the holding section 28 representing middle housing cover 20, and (b) of Figure 12 is to represent to be sticked in
The top view of the jut 27 in holding section 28.Holding section 28 is formed in the incised notch of the L font of the edge of middle housing cover 20
Portion.The 1st incised notch portion 28a that this holding section 28 is substantially axially extended by the edge from middle housing cover 20 and cutting from the 1st
Scarce portion 28a the 2nd incised notch portion 28b circumferentially is constituted.As shown in (b) of Figure 12, jut 27 can be sticked in the 2nd incised notch
Portion 28b.
Middle housing cover 20 is linked with middle housing 3A as follows.So that middle housing cover 20 is axially moveable, will dash forward
Play portion 27 to import to holding section 28 from the 1st incised notch portion 28a.Further, make middle housing cover 20 overall centered on its axle center
Rotation, thus as shown in (b) of Figure 12, jut 27 is imported in the 2nd incised notch portion 28b.Thus, jut 27 and holding section
28 engagings.Then, by the 2nd screw element 32, diffuser ring 12 is fixed on final stage middle housing 3D.When fastening the 2nd screw element 32
When, diffuser ring 12 pushes final stage middle housing 3D vertically, and thus, middle housing 3A～3D mutually tightens together.In Figure 10
In shown embodiment, due to not using screw element as the 1st fixed mechanism 21, it is possible to realizing subtracting of amount of parts
Less and decompose repair simplification.
In embodiment shown in Fig. 5 to Figure 12, by the 1st fixed mechanism 23 fix first order middle housing 3A with
The relative position of middle housing cover 20, fixes the relative position of middle housing 3A～3D by the 2nd fixed mechanism 31, but conduct
Other embodiment it is also possible to exchange the position of the 1st fixed mechanism 23 and the 2nd fixed mechanism 31, by the 1st fixed mechanism 23
Fixing final stage middle housing 3D and the relative position of middle housing cover 20, push the first order vertically by the 2nd fixed mechanism 31
Middle housing 3A is fixing the relative position of middle housing 3A～3D.
Embodiment shown in Fig. 5 and Figure 10 is the multistage pump with 4 grades of impellers, but the invention is not restricted to these embodiment party
Formula, the present invention can be applied to the multistage pump with multi-stage impeller.Especially, the present invention can be highly suitable for moving with high pressure
The high-pressure multi-stage pump of liquor charging body.
The record of above-mentioned embodiment can implement this to have the personnel of the usual knowledge of the technical field of the invention
For the purpose of invention.The various modifications example of above-mentioned embodiment be to those skilled in the art certain it is also envisioned that this
The technological thought of invention also can be applied to other embodiment.Therefore, the present invention is not limited to described embodiment,
Can be explained in the maximum magnitude according to technological thought as defined in the claims.
Claims (11)
1. a kind of multistage pump is it is characterised in that have：
It is fixed on the multi-stage impeller of axle；
Along described axle bearing of trend is overlapping, multistage middle housing that is receiving described impeller；
It is respectively arranged at the multiple stators in described multistage middle housing；
Receive the middle housing cover of described middle housing；
Surround described middle housing and the outside housing of described middle housing cover；With
Described middle housing cover is fixed on the fixed mechanism on described middle housing,
Suction inlet and the outlet of liquid are provided with the housing of described outside.
2. multistage pump as claimed in claim 1 it is characterised in that
Described middle housing cover is drum.
3. multistage pump as claimed in claim 1 it is characterised in that
Described fixed mechanism has：1st fixed mechanism of the relative position of fixing described middle housing cover and described middle housing；
The 2nd fixed mechanism with fixing described middle housing the relative position of each other.
4. multistage pump as claimed in claim 3 it is characterised in that
Described 1st fixed mechanism fixes the relative position of described middle housing cover and first order middle housing, the described 2nd fixing machine
Structure makes the connection secured to one another of described middle housing by pushing final stage middle housing vertically.
5. multistage pump as claimed in claim 4 it is characterised in that
Described 1st fixed mechanism has：It is formed at the 1st screwed hole on described first order middle housing；With described 1st screwed hole
The 1st screw element screwing togather；With the through hole being formed on described middle housing cover and pass through for described 1st screw element.
6. multistage pump as claimed in claim 4 it is characterised in that
Described 1st fixed mechanism has：It is formed on described first order middle housing and has the 1st screw thread of taper chimeric surface
Hole；There is the taper surface chimeric with described taper chimeric surface and the 1st screw element screwing togather with described 1st screwed hole；Be formed at
The through hole passing through on described middle housing cover and for described 1st screw element.
7. multistage pump as claimed in claim 4 it is characterised in that
Described 1st fixed mechanism has：It is formed at the jut on described first order middle housing；Be formed at described stage casing shell
On body cover and have for described jut engaging shape holding section.
8. the multistage pump as any one of claim 4 to claim 7 it is characterised in that
Described 2nd fixed mechanism has：It is formed at the 2nd screwed hole on described middle housing cover and described final stage middle housing
Adjacent push part and screw togather with described 2nd screwed hole and described push part is pressed to described final stage middle housing
On the 2nd screw element.
9. multistage pump as claimed in claim 8 it is characterised in that
It has been internally formed bubbler in described push part.
10. multistage pump as claimed in claim 3 it is characterised in that
Described 1st fixed mechanism fixes the relative position of described middle housing cover and final stage middle housing, described 2nd fixed mechanism
Make the connection secured to one another of described middle housing by pushing first order middle housing vertically.
A kind of 11. multistage pumps are it is characterised in that have：
It is fixed on the multi-stage impeller of axle；
Along described axle bearing of trend is overlapping, multistage middle housing that is receiving described impeller；
It is respectively arranged at the multiple stators in described multistage middle housing；
Receive the middle housing cover of described middle housing；
Surround described middle housing and the outside housing of described middle housing cover；With
Described middle housing cover is fixed on the fixed mechanism on described middle housing,
Suction inlet and the outlet of liquid are provided with the housing of described outside,
Described fixed mechanism has：1st fixed mechanism of the relative position of fixing described middle housing cover and described middle housing；
With the 2nd fixed mechanism of fixing described middle housing the relative position of each other,
Described 2nd fixed mechanism has：The 2nd screwed hole being formed on described middle housing cover is adjacent with final stage middle housing
The push part that connects and screw togather with described 2nd screwed hole and described push part is pressed on described final stage middle housing
2nd screw element.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012047600 | 2012-03-05 | ||
| JP2012-047600 | 2012-03-05 | ||
| JP2013-027680 | 2013-02-15 | ||
| JP2013027680A JP6196783B2 (en) | 2012-03-05 | 2013-02-15 | Multistage pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103306986A CN103306986A (en) | 2013-09-18 |
| CN103306986B true CN103306986B (en) | 2017-03-01 |
Family
ID=49132577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310071431.2A Active CN103306986B (en) | 2012-03-05 | 2013-03-05 | Multistage pump |
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| Country | Link |
|---|---|
| CN (1) | CN103306986B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN103306986A (en) | 2013-09-18 |
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