CN112855612B - Large centrifugal pump with lining not easy to tear - Google Patents
Large centrifugal pump with lining not easy to tear Download PDFInfo
- Publication number
- CN112855612B CN112855612B CN202110033013.9A CN202110033013A CN112855612B CN 112855612 B CN112855612 B CN 112855612B CN 202110033013 A CN202110033013 A CN 202110033013A CN 112855612 B CN112855612 B CN 112855612B
- Authority
- CN
- China
- Prior art keywords
- lining
- pump
- centrifugal pump
- metal casing
- flange limit
- 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.)
- Active
Links
- 239000002184 metal Substances 0.000 claims abstract description 48
- 210000001503 joint Anatomy 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 2
- 239000004033 plastic Substances 0.000 abstract description 23
- 229920003023 plastic Polymers 0.000 abstract description 23
- 238000005336 cracking Methods 0.000 abstract description 4
- 230000008602 contraction Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 description 3
- 238000003754 machining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
- F04D29/4266—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps made of sheet metal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal 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
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
-
- 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
- F04D29/02—Selection of particular materials
- F04D29/026—Selection of particular materials 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
- 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
- F04D29/4286—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps inside lining, e.g. rubber
Abstract
The invention discloses a large centrifugal pump with a lining not easy to tear, which comprises a pump shell, a pump cover, an impeller, a main shaft and a motor, wherein the pump shell comprises a metal shell and a lining plastic layer positioned in the metal shell, the upper end of the metal shell is provided with an outwards turned lower flange edge, the top end of the lining plastic layer extends out of the upper end of the metal shell and is provided with an outwards turned upper flange edge corresponding to the outwards turned lower flange edge, a shrinkage joint is formed between the outwards turned upper flange edge and the outwards turned lower flange edge at a distance, and the outwards turned lower flange edge is provided with a connecting hole corresponding to the pump cover. The problem of cracking of the volute lining of the large-sized centrifugal pump is solved, and the product quality of the large-sized plastic-lined centrifugal pump is effectively improved.
Description
Technical Field
The invention relates to an improvement of a plastic-lined centrifugal pump structure, in particular to a pump shell of a plastic-lined centrifugal pump.
Background
The liner layer of the pump casing of large plastic-lined centrifugal pumps often causes shrinkage cracking of the liner layer of the pump volute due to the different linear expansion coefficients of the metal casing and the plastic liner. The reason of fracture is mainly that the shrinkage ratio of metal and lining is inconsistent, and the shrinkage of lining is greater than the shrinkage of metal casing, and produces local stress, makes pump lining shrink tearing, and in prior art, as shown in fig. 2, the shrinkage stress that the plastics lining 1.2 of pump oral area produced, all concentrate in the turn-ups 1.2.1 department of lining plastic layer exit flange, the plastic layer of turn-ups portion is limited by metal casing 1.1, when lining is because of the low inward shrink of temperature, the lining can not be to the displacement in the pump spiral case, and the axial stress of lining plastic layer towards the pump exit direction is very big, at 0~100 ℃ difference in temperature, the shrinkage ratio of plastics reaches about 1.2%. Taking a pump shell with a suction inlet diameter of 400mm as an example, the inner contraction of the outlet of the pump shell lining layer is 4-6 mm, but the flanging of the lining plastic layer is fixed by the metal shell due to the shape structure, and the contraction stress of the lining layer is concentrated on the lining plastic layer at the position of the outlet flange 1.1.1. In the cold and hot shock process, stress generated by shrinkage cannot be released, so that local lining tearing can occur, and especially local shrinkage tearing is more likely to occur in a position where the pump use temperature exceeds 70 ℃.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the large-sized plastic-lined centrifugal pump with the plastic-lined layer in the pump shell not being cracked, and the quality stability of the large-sized plastic-lined centrifugal pump is improved.
In order to achieve the purpose of the invention, the following technical scheme is provided: the utility model provides a large-scale centrifugal pump that inside lining is difficult for tearing, includes pump case, pump cover, impeller, main shaft and motor, its characterized in that pump case includes metal casing and the lining that is located metal casing mould the layer, and metal casing upper end is equipped with the outer flange limit that turns down, and the lining is moulded the layer top and is stretched out metal casing upper end to correspond the outer flange limit that turns down and be equipped with the flange limit that turns up, have the interval to form the shrinkage joint between the flange limit that turns up and the outer flange limit that turns down, the connecting hole has been seted up corresponding pump cover on the outer flange limit that turns down.
Preferably, a first annular gasket is arranged in the shrinkage joint.
Preferably, the annular gasket I is formed by splicing a plurality of plates.
Preferably, the first annular gasket is a rigid gasket. After the shrinkage of the plastic lining layer is finished and the stress is eliminated, a rigid gasket is arranged in the shrinkage joint to support the fastening force and further play a role in static sealing.
Preferably, the annular gasket No. one is a solid resin.
In order to achieve the purpose of the invention, another technical scheme is provided: the utility model provides a large-scale centrifugal pump that inside lining is difficult for tearing, includes pump case, pump cover, impeller, main shaft and motor, its characterized in that pump case includes metal casing and is located the lining of metal casing and mould the layer, and metal casing upper end is equipped with the outer flange limit that turns down, and lining mould layer top and stretch out metal casing upper end to correspond the outer flange limit that turns down and be equipped with the flange limit that turns up, turn up the flange limit and turn up to have the interval between the flange limit down outward and form shrink chamber, shrink intracavity is equipped with the metal ring cover, is equipped with No. two connecting holes on the metal ring cover.
Preferably, the cross section of the metal ring sleeve is U-shaped with an opening facing the outer side of the metal shell, the metal ring sleeve comprises an upper flange end face, a lower flange end face and a ring body, the ring body is embedded in the shrinkage cavity, the second connecting hole is positioned on the upper flange end face, and the lower flange end face is in butt joint with the turned-out lower flange edge.
The invention has the beneficial effects that: the lining outlet of the lining plastic centrifugal pump is modified in local structure, so that the long-standing problem in the production and manufacture of the domestic large-scale centrifugal pump volute is solved: the problem of cracking of the volute lining of the large-sized centrifugal pump is solved, and the product quality of the large-sized plastic-lined centrifugal pump is effectively improved. By arranging the shrinkage joint, the shrinkage stress structure of the lining layer of the pump shell of the centrifugal pump is eliminated, and further, the cracking of the lining of the centrifugal pump caused by thermal expansion and cold contraction is prevented, so that the structure that the lining layer of the volute of the plastic-lined centrifugal pump extends outwards and is fixedly held by half is also covered in the scope of the invention.
Drawings
Fig. 1 is a schematic diagram of a prior art pump outlet liner.
Fig. 2 is a schematic structural diagram of a plastic lined large centrifugal pump.
Fig. 3 is an enlarged schematic view of part a of fig. 2.
Fig. 4 is a schematic diagram of example 2.
Fig. 5 is a schematic view of the rigid liner of fig. 4.
Fig. 6 is a schematic view of a structure of a mold provided with an inner convex ring.
Fig. 7 is a schematic structural diagram of embodiment 3 of the present invention.
Detailed Description
Example 1: as shown in fig. 1, a large centrifugal pump with a lining not easy to tear comprises a pump shell 1, a pump cover 2, an impeller 3, a main shaft 4, a shaft seal 5, a bearing bracket 6, a motor 7 and a bottom plate 8 in the prior art.
As shown in FIG. 3, the size of the pump shell is larger than 300mm, the pump shell comprises a metal shell 1.1 and a plastic lining layer 1.2 positioned in the metal shell 1.1, an outwards turned lower flange edge 1.1.1 is arranged at the upper end of the metal shell 1.1, the top end of the plastic lining layer 1.2 extends out of the upper end of the metal shell 1.1, an outwards turned upper flange edge 1.2.1 is arranged corresponding to the outwards turned lower flange edge 1.1.1, a shrinkage joint 1.3 is formed between the outwards turned upper flange edge 1.2.1 and the outwards turned lower flange edge 1.1.1 at intervals, and a connecting hole is formed in the outwards turned lower flange edge 1.1.1 corresponding to the pump cover 2. As shown in fig. 6, the method is carried out by providing a mold collar portion M1 for forming an anti-shrinkage joint or cavity on a mold when a pump casing lining mold is manufactured, and forming an annular shrinkage joint 1.3 at a pump casing lining body 1.2 after compression molding and demolding.
Example 2: as shown in fig. 4 and 5, referring to example 1, after the stress at the turned-up flange edge 1.2.1 of the lining plastic layer 1.2 is relieved, a first annular gasket 1.4 is provided in the shrinkage joint 1.3 for the purpose of tight sealing of the sealing surface. The first annular gasket is formed by splicing a plurality of plates 1.4. The first annular gaskets 1 and 4 are rigid gaskets, and the materials are also rigid resins.
Example 3: as shown in fig. 7, the pump casing comprises a metal casing 1.1 and a plastic lining layer 1.2 positioned in the metal casing 1.1, wherein an outwards turned lower flange edge 1.1.1 is arranged at the upper end of the metal casing 1.1, the top end of the plastic lining layer 1.2 extends out of the upper end of the metal casing 1.1, an outwards turned upper flange edge 1.2.1 is arranged corresponding to the outwards turned lower flange edge 1.1.1, a contraction cavity 1.3 is formed between the outwards turned upper flange edge 1.2.1 and the outwards turned lower flange edge 1.1.1, a metal ring sleeve 1.5 is arranged in the contraction cavity 1.3, and a second connecting hole is formed in the metal ring sleeve 1.5. The cross section of the metal ring sleeve 1.5 is U-shaped with an opening facing the outer side of the metal shell 1.1, the metal ring sleeve 1.5 comprises an upper flange end face 1.5.1, a lower flange end face 1.5.2 and a ring body 1.5.3, the ring body 1.5.3 is embedded in the shrinkage cavity 1.5, the second connecting hole is positioned on the upper flange end face 1.5.1, and the lower flange end face 1.5.2 is in butt joint with the turned-out lower flange edge 1.1.1.
The plastic-lined layer in the above embodiments refers to a commonly used polyethylene plastic, ultra-high molecular weight polyethylene plastic (UHMWPE), polypropylene plastic or other modified plastic, preferably ultra-high molecular weight polyethylene plastic.
After the processing of each part is finished, the main shaft, the bearing bracket, the bearing, the pump shell, the shaft seal, the impeller, the pump cover, the base and the motor can be installed together according to the installation flow of the conventional centrifugal pump, and the plastic lining anti-corrosion centrifugal pump with the pump lining layer not being cracked can be obtained after debugging and painting.
The shrinkage joint 1.3 on the pump liner layer in example 1 can also be obtained by machining, in particular by molding the liner layer without directly pressing the shrinkage joint, but by machining.
Claims (7)
1. The utility model provides a large-scale centrifugal pump that inside lining is difficult for tearing, includes pump case, pump cover, impeller, main shaft and motor, its characterized in that pump case includes metal casing and the lining that is located metal casing mould the layer, and metal casing upper end is equipped with the outer flange limit that turns down, and the lining is moulded the layer top and is stretched out metal casing upper end to correspond the outer flange limit that turns down and be equipped with the flange limit that turns up, have the interval to form the shrinkage joint between the flange limit that turns up and the outer flange limit that turns down, the connecting hole has been seted up corresponding pump cover on the outer flange limit that turns down.
2. A large centrifugal pump with a lining less prone to tearing according to claim 1, characterized in that a number one annular liner is arranged in the shrinkage joint.
3. The large centrifugal pump with a lining less prone to tearing according to claim 1, wherein the annular gasket No. one is formed by multi-piece splicing.
4. A large centrifugal pump with a liner that is not easily torn according to claim 1, wherein the annular liner No. 1 is a rigid liner.
5. A large centrifugal pump with a liner that is not easily torn according to claim 1, wherein the annular liner No. one is a solid resin.
6. The utility model provides a large-scale centrifugal pump that inside lining is difficult for tearing, includes pump case, pump cover, impeller, main shaft and motor, its characterized in that pump case includes metal casing and is located the lining of metal casing and mould the layer, and metal casing upper end is equipped with the outer flange limit that turns down, and lining mould layer top and stretch out metal casing upper end to correspond the outer flange limit that turns down and be equipped with the flange limit that turns up, turn up the flange limit and turn up to have the interval between the flange limit down outward and form shrink chamber, shrink intracavity is equipped with the metal ring cover, is equipped with No. two connecting holes on the metal ring cover.
7. The large centrifugal pump with the lining not easy to tear according to claim 6, wherein the section of the metal ring sleeve is U-shaped with an opening facing the outer side of the metal shell, the metal ring sleeve comprises an upper flange end face, a lower flange end face and a ring body, the ring body is embedded in the shrinkage cavity, the second connecting hole is positioned on the upper flange end face, and the lower flange end face is in butt joint with the turned-out lower flange edge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110033013.9A CN112855612B (en) | 2021-01-12 | 2021-01-12 | Large centrifugal pump with lining not easy to tear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110033013.9A CN112855612B (en) | 2021-01-12 | 2021-01-12 | Large centrifugal pump with lining not easy to tear |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112855612A CN112855612A (en) | 2021-05-28 |
| CN112855612B true CN112855612B (en) | 2024-03-22 |
Family
ID=76002556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110033013.9A Active CN112855612B (en) | 2021-01-12 | 2021-01-12 | Large centrifugal pump with lining not easy to tear |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112855612B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU4476072A (en) * | 1972-07-20 | 1974-01-24 | Speck-Pompeo Daniel Speck & Sohne | Centrifugal pump of synthetic material |
| CN1427777A (en) * | 2000-05-08 | 2003-07-02 | 株式会社Hics | Writing implement |
| CN109083263A (en) * | 2018-08-31 | 2018-12-25 | 侯明明 | A kind of multifunctional vacuum sewer dredger |
-
2021
- 2021-01-12 CN CN202110033013.9A patent/CN112855612B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU4476072A (en) * | 1972-07-20 | 1974-01-24 | Speck-Pompeo Daniel Speck & Sohne | Centrifugal pump of synthetic material |
| CN1427777A (en) * | 2000-05-08 | 2003-07-02 | 株式会社Hics | Writing implement |
| CN109083263A (en) * | 2018-08-31 | 2018-12-25 | 侯明明 | A kind of multifunctional vacuum sewer dredger |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112855612A (en) | 2021-05-28 |
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| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |