CN206770286U - A kind of choma fixed connection structure of centrifugal multistage pump multiple centrifugal pump - Google Patents
A kind of choma fixed connection structure of centrifugal multistage pump multiple centrifugal pump Download PDFInfo
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- CN206770286U CN206770286U CN201720360043.XU CN201720360043U CN206770286U CN 206770286 U CN206770286 U CN 206770286U CN 201720360043 U CN201720360043 U CN 201720360043U CN 206770286 U CN206770286 U CN 206770286U
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- choma
- pump housing
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Abstract
It the utility model is related to pump housing the Hydraulic Design technical field, the choma fixed connection structure of particularly a kind of centrifugal multistage pump multiple centrifugal pump.Choma under choma and the pump housing on the pump housing of utility model, it is characterised in that the junction of choma and choma under the pump housing opens up connecting hole on the pump housing, connection shaft shoulder screw in connecting hole.Using shaft shoulder screw, positioned using the shaft shoulder screw first half, lower half connection.This solution solves the problem of insufficient space, gap is opened up on choma on the pump housing, is easily installed tool operation.The junction of choma and choma under the pump housing opens up connecting hole on the pump housing, and open circles pin is connected in connecting hole, is provided with screw thread on the inside of open circles pin, screw thread is connected with fillister head screw, and fillister head screw one end is connected through open circles pin with choma under the pump housing.Further reduce gap.
Description
Technical field
Pump housing the Hydraulic Design technical field is the utility model is related to, particularly a kind of choma of centrifugal multistage pump multiple centrifugal pump is fixedly connected
Structure.
Background technology
Multistage middle open formula centrifugal pump body choma is very important part, and the number of parts is big, for the ease of pump
Installation, maintenance, the replacing of body choma, are generally designed to middle open type structure by pump housing choma（Figure one）.This middle open type pump housing mouth
For ring to internal diameter d, outer diameter D required precision is very high, and especially internal diameter d requires cylindricity within 0.02mm, if not reaching this requirement,
Pump can produce eccentric wear in operation process middle pump body choma and rotor, influence the normal operation of pump, substantially reduce the life-span of pump.Cause
This this middle open type pump housing choma difficulty of processing is very big, be mainly manifested in choma on the pump housing, under the pump housing choma close it is processed when it is easily wrong
Position, it is difficult to ensure the cylindricity and axiality of middle open type pump housing choma.
Existing processing technology thinking has following several：
Scheme one, middle open type pump housing choma only use mode connects for screw；Such a scheme is simple, but two halves are easy in process
Dislocation, is unable to reach precision prescribed.
Scheme two, using common cylinder finger setting and use mode connects for screw；Such a scheme meets processing technology requirement, both can be with
Ensure that positioning can ensure to connect again, but pump housing choma axial dimension is limited, and space is small, it is difficult to while accommodate straight pin and spiral shell
Nail.
Using existing above two design, the middle open type pump housing choma internal diameter d cylindricities being processed into are much larger than
0.02mm, apparent inconsistent phenomenon in secondary assembling process be present, the product processed is unqualified.
Utility model content
To overcome drawbacks described above, the utility model technical issues that need to address are to provide one kind and do not change original space knot
Structure makes pump housing choma two halves realize reliably positioning and connect that the choma for improving the centrifugal multistage pump multiple centrifugal pump of processing and assembly reliability is consolidated
Determine attachment structure and its quick method for dismounting.
To solve described technical problem the technical solution of the utility model：
A kind of choma fixed connection structure of centrifugal multistage pump multiple centrifugal pump, including choma, the pump housing under choma and the pump housing on the pump housing
The junction of upper choma and choma under the pump housing opens up connecting hole, and shaft shoulder screw is connected in connecting hole.
On the pump housing gap is opened up on choma.
The junction of choma and choma under the pump housing opens up connecting hole on the pump housing, and open circles pin is connected in connecting hole,
Screw thread is provided with the inside of open circles pin, screw thread is connected with fillister head screw, and fillister head screw one end passes through open circles pin and pump
Choma connects under body.
Plain washer is provided between the open circles pin and fillister head screw.
One section of internal thread is provided with the inside of the open circles pin, another section is through hole.
The nut of the fillister head screw opens up interior hexagonal hole.
Open circles pin, fillister head screw and the plain washer are coaxially laid, and open circles pin is matched somebody with somebody with connecting hole for transition
Close.
Choma sets locating piece with symmetrically opening up location dimples on choma under the pump housing in location dimples on the pump housing.
The beneficial effects of the utility model are：
1st, choma under choma and the pump housing on the pump housing of the present utility model, it is characterised in that on the pump housing choma with the pump housing
The junction of choma opens up connecting hole, and shaft shoulder screw is connected in connecting hole.Using shaft shoulder screw, determined using the shaft shoulder screw first half
Position, lower half connection.This solution solves the problem of insufficient space, gap is opened up on choma on the pump housing, is easily installed work
Tool operation.
2nd, the junction of choma and choma under the pump housing opens up connecting hole on the pump housing, and hollow cylinder is connected in connecting hole
Pin, open circles pin inner side are provided with screw thread, and screw thread is connected with fillister head screw, and fillister head screw one end passes through open circles pin
It is connected with choma under the pump housing.Gap is further reduced, while prevents moving between part, locating effect is lifted, passes through hollow cylinder
The dual position of pin and connecting hole limits erection ＆ lift precision.Plain cushion is provided between the open circles pin and fillister head screw
Circle, bonding strength is lifted, is easy to the later stage to dismantle.
3rd, one section of internal thread is provided with the inside of the open circles pin, another section is through hole.Fillister head screw upper end with it is hollow
Internal thread is fixed on the inside of straight pin, and fillister head screw lower end is fixed with connecting hole, is reduced difficulty of processing and is fixed with time-division multiple spot, point
Dissipate stress and lifting connection precision and intensity, the nut of fillister head screw open up interior hexagonal hole.Reserve bigger operating space.It is described
Choma sets locating piece with symmetrically opening up location dimples on choma under the pump housing in location dimples on the pump housing.Locking mechanism is set up, is had
Effect prevents operational vibration from causing eccentric wear.
Brief description of the drawings
Fig. 1 is prior art construction schematic diagram；
Fig. 2 is the utility model structure diagram I；
Fig. 3 is the utility model structure diagram II；
Fig. 4 is the utility model partial enlarged drawing and force analysis；
Fig. 5 is the utility model assembling schematic diagram；
Fig. 6 is the utility model open circles pin sectional view.
Embodiment
The utility model is described further below in conjunction with the accompanying drawings.
A kind of choma fixed connection structure of centrifugal multistage pump multiple centrifugal pump, including choma, the pump housing under choma and the pump housing on the pump housing
The junction of upper choma 1 and choma 2 under the pump housing opens up connecting hole, and shaft shoulder screw 3 is connected in connecting hole.Choma 1 on the pump housing
On open up gap.
The junction of choma 1 and choma 2 under the pump housing opens up connecting hole on the pump housing, and open circles pin is connected in connecting hole
4, the inner side of open circles pin 4 is provided with screw thread, and screw thread is connected with fillister head screw 5, and the one end of fillister head screw 5 passes through hollow cylinder
Pin 4 is connected with choma under the pump housing 2.Plain washer 6 is provided between the open circles pin 4 and fillister head screw 5.The hollow cylinder
The inner side of pin 4 is provided with one section of internal thread, and another section is through hole.The nut of the fillister head screw 5 opens up interior hexagonal hole.It is described hollow
Straight pin 4, fillister head screw 5 and plain washer 6 are coaxially laid, and open circles pin 4 and connecting hole are interference fits.On the pump housing
Choma 1 sets locating piece 7 with symmetrically opening up location dimples on choma 2 under the pump housing in location dimples.
A kind of quick method for dismounting of choma fixed connection structure of centrifugal multistage pump multiple centrifugal pump, comprises the following steps：
A, choma splices
Choma 1 is buckled on the pump housing and is stitched together with choma under the pump housing 2 on the pump housing；
B, it is fixedly connected
Choma 1 tightens screw with being connected shaft shoulder screw 3 or open circles pin 4 in the connecting hole of choma under the pump housing 2 on the pump housing
Complete installation；
C, dismantling connection
Screw is unclamped, removes choma 1 and shaft shoulder screw 3 or open circles pin in the connecting hole of choma 2 under the pump housing on the pump housing
4, separate choma 1 on the pump housing and complete to dismantle with choma 2 under the pump housing.
D, position sealed
Placement positioning block 7 realizes that positioning is sealed in location dimples in step A progress.
Such as figure three, figure four show the part in the utility model, and open circles pin is design specialized part, is the utility model
Core part.
Pump housing choma（On）With pump housing choma（Under）Pin hole processing is matched, first has to ensure that pin-and-hole on two semi-rings is absolute
Axiality, otherwise open circles pin can not install；Secondly, pin-and-hole dimension D 2 is critical size, and processing request is shown in Table one；Pump housing mouth
Ring（Under）Pin-and-hole depth dimensionsD2≤H1≤D2；
The middle open type pump housing choma dowel hole requirement on machining accuracy of table one
| Size | Accuracy class | Roughness | Cylindricity |
| D2 | 5 ~ 9 grades | Ra≤3.2µm | By 5 ~ 9 class precisions |
Open circles pin is core part of the present utility model, as shown in figure 6, open circles pin external cylindrical surface dimension D 1
For critical size, processing request is shown in Table two；Length dimension L can design according to size H2, should be noted during design ensure size h=1 ~
2mm, i.e. L=H1+H2-h.One section of chamfering of hollow cylinder pin head part Excircle machining, chamfer dimesion θ=15 ° ~ 20 °, L2=2 ~ 3mm
, corner angle rounding and polish at chamfering, this is for the ease of assembling, plays guiding function.Spiral shell is processed at open circles pin afterbody endoporus
Line, size M is depending on open circles pin outer diameter D 1, ordinary circumstance M-D1 >=4mm；
The open circles pin requirement on machining accuracy of table two
| Size | Accuracy class | Roughness | Cylindricity |
| D1 | 5 ~ 9 grades | Ra≤0.8µm | By 5 ~ 9 class precisions |
Pin connection strength check need to be carried out when designing open circles pin：
Calculate the shear stress of pin：, then it is qualified.
In formula：The shearing force that F-pin is born, N；
The diameter of d-pin, mm；
The quantity of Z-pin；
The shear stress allowable of-pin.
The selection of hexagon socket head fillister head screw and plain washer mainly has claimed below：The selection of screw needs and hollow cylinder
Pin coordinates, and screw specification size is than the small No.1s of open circles pin dimension of inner screw thread M, if example open circles pin afterbody dimension of inner screw thread
M is M12, then from the screw that specification is M10；The selection of plain washer need to match somebody with somebody with open circles pin and hexagon socket cap head screw
Close, guarantee plain washer outside dimension >=（D1 + 2）.
Hexagon socket cap head screw need to be attached strength check:
Screw is by axial load：, then it is qualified.
Allowable stress
Full payload
Pretightning force
Residual pre-tightening forces
In formula：- axial load, N；
Axial full payload, N suffered by-screw；
- residual pre-tightening forces, N；
d1- screw path, mm；
K-residual pre-tightening forces coefficient, it is that general connection is used in the utility model, K takes 0.2 ~ 0.6；
λ-relative rigidity, is chosen according to gasket material, and metallic gasket is used in the utility model, and λ takes 0.2 ~ 0.3；
- screw yield strength, Mpa, is determined by mechanical performance grade；
- safety coefficient, it is dead load in the utility model,Take 3 ~ 5.
Specific assembling refers to figure five, first with open circles pin by pump housing choma（On）、（Under）Positioning, this process pay attention to needing
Open circles pin is installed in place, next plain washer is installed successively and use the connection of interior hexagonal cylindrical head can be to pump housing choma
Finished.
Example explanation：
Open circles pin size：D1=16m6, L=33, M=M12, θ=15 °, L2=3mm；
Middle open type pump housing choma junction pin-and-hole size：D2=16H7, H1=10, H2=25；
Middle open type pump housing choma junction screwed hole size：M10, deep 15；
From hexagon socket cap head screw M10 × 50（GB/T70.1-2000）, packing ring 10（GB/T96.1-2002）.
Claims (6)
1. a kind of choma fixed connection structure of centrifugal multistage pump multiple centrifugal pump, including choma under choma and the pump housing on the pump housing, it is characterised in that
Choma on the pump housing（1）With choma under the pump housing（2）Junction open up connecting hole, connection shaft shoulder screw in connecting hole（3）；
Choma on the pump housing（1）On open up gap；
Choma on the pump housing（1）With choma under the pump housing（2）Junction open up connecting hole, connection open circles pin in connecting hole
（4）, open circles pin（4）Inner side is provided with screw thread, screw thread and fillister head screw（5）Connection, fillister head screw（5）One end passes through
Open circles pin（4）With choma under the pump housing（2）Connection.
2. the choma fixed connection structure of a kind of centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterised in that described hollow
Straight pin（4）And fillister head screw（5）Between be provided with plain washer（6）.
3. the choma fixed connection structure of a kind of centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterised in that described hollow
Straight pin（4）Inner side is provided with one section of internal thread, and another section is through hole.
A kind of 4. choma fixed connection structure of centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterised in that the cylinder
Head screw（5）Nut open up interior hexagonal hole.
5. the choma fixed connection structure of a kind of centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterised in that described hollow
Straight pin（4）, fillister head screw（5）And plain washer（6）It is coaxial to lay, open circles pin（4）It is interference fits with connecting hole.
A kind of 6. choma fixed connection structure of centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterised in that the pump housing
Upper choma（1）With choma under the pump housing（2）On symmetrically open up location dimples, locating piece is set in location dimples（7）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720360043.XU CN206770286U (en) | 2017-04-07 | 2017-04-07 | A kind of choma fixed connection structure of centrifugal multistage pump multiple centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720360043.XU CN206770286U (en) | 2017-04-07 | 2017-04-07 | A kind of choma fixed connection structure of centrifugal multistage pump multiple centrifugal pump |
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| Publication Number | Publication Date |
|---|---|
| CN206770286U true CN206770286U (en) | 2017-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720360043.XU Active CN206770286U (en) | 2017-04-07 | 2017-04-07 | A kind of choma fixed connection structure of centrifugal multistage pump multiple centrifugal pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111963487A (en) * | 2020-09-01 | 2020-11-20 | 赣州市闻誉科技有限公司 | Anti-loosening bolt structure on centrifugal pump body |
-
2017
- 2017-04-07 CN CN201720360043.XU patent/CN206770286U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111963487A (en) * | 2020-09-01 | 2020-11-20 | 赣州市闻誉科技有限公司 | Anti-loosening bolt structure on centrifugal pump body |
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