CN113606185A - Closed impeller structure convenient to investment casting - Google Patents
Closed impeller structure convenient to investment casting Download PDFInfo
- Publication number
- CN113606185A CN113606185A CN202111015776.7A CN202111015776A CN113606185A CN 113606185 A CN113606185 A CN 113606185A CN 202111015776 A CN202111015776 A CN 202111015776A CN 113606185 A CN113606185 A CN 113606185A
- Authority
- CN
- China
- Prior art keywords
- opening
- cavity
- cover plate
- positioning
- investment casting
- 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
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- 238000005495 investment casting Methods 0.000 title claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 238000003466 welding Methods 0.000 claims description 12
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 7
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 238000007605 air drying Methods 0.000 abstract description 3
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 12
- 239000000919 ceramic Substances 0.000 description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2205—Conventional flow pattern
- F04D29/2222—Construction and assembly
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/20—Manufacture essentially without removing material
- F05D2230/21—Manufacture essentially without removing material by casting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/20—Manufacture essentially without removing material
- F05D2230/23—Manufacture essentially without removing material by permanently joining parts together
- F05D2230/232—Manufacture essentially without removing material by permanently joining parts together by welding
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to a closed impeller structure convenient for investment casting, which comprises a body, wherein the body comprises a top plate and a bottom plate, a cavity is formed between the top plate and the bottom plate, a liquid inlet communicated with the cavity is formed in the middle of the top plate, a plurality of blades are arranged in the cavity, the cavity is divided into a plurality of flow channels by the blades, one side of each flow channel, which is far away from the liquid inlet, is opened to form a liquid outlet, and an opening is formed in the body corresponding to each flow channel and is formed in the top plate or the bottom plate; the side of the opening far away from the chamber is fixedly connected with a cover plate, and a positioning structure is arranged between the cover plate and the opening and can limit the position of the cover plate relative to the opening. In the shell making process, the opening structure of the body part creates favorable conditions for coating and air drying in the flow channel, the wet strength of the body core can be ensured to resist the dewaxing expansion force, and the high-temperature strength can resist the impact force and the buoyancy force of molten steel.
Description
Technical Field
The invention relates to the technical field of closed impellers, in particular to a closed impeller structure convenient for investment casting.
Background
The mainstream shell making process in the investment casting industry adopts silica sol adhesive, the silica sol is water-based adhesive, and the shell can have good wet strength and high-temperature strength after being dried layer by layer thoroughly during shell making. The silica sol shell making process can not coat and hang enough layers on one hand and is not beneficial to shell drying on the other hand for a structure with narrow space, so that the strength of a shell core is low, the core is directly fractured after dewaxing when the wet strength is low, the core is fractured after pouring when the high-temperature strength is low, and the production and manufacturing can not be met.
The impeller is the important component part of pump package, and the closed impeller is sealed by upper and lower apron and has the inner chamber structure of distortion, and wherein the water outlet is little and the impeller that the performance requires is high often accomplishes through investment casting, along with closed impeller diameter grow and the design size of delivery port diminishes, its system shell degree of difficulty doubly increases, and prior art also can't ensure production after the size reaches certain limit.
At present, two conventional processes are used for manufacturing a closed impeller with a small water outlet size by investment casting: and (4) assembling the ceramic core in a split manner.
The ceramic core process is characterized in that a narrow core of the impeller is manufactured in a ceramic manufacturing mode, then the ceramic core is wrapped by an upper wax cover plate and a lower wax cover plate to complete the manufacture of the whole wax mold, and the ceramic core replaces the conventional shell manufacturing of the core. The ceramic core is restricted by the strength of the ceramic core, and the ceramic core is easy to generate fatal defects of fracture and deformation after the diameter of the closed impeller exceeds the limit, so that the ceramic core cannot be applied to the production of large-diameter (the diameter is about more than or equal to 200mm) closed impellers.
The split assembly process comprises the steps of firstly finely machining the cover plate surface and the blade surface, then matching the cover plate surface and the blade surface, and finally assembling the two bodies into a whole in a screw fixing mode.
Disclosure of Invention
Aiming at the defects in the prior art, the technical problem to be solved by the invention is to provide a closed impeller structure convenient for investment casting, which can coat enough layers in a silica sol shell making process and is beneficial to drying a shell.
In order to solve the technical problem, the invention provides a closed impeller structure convenient for investment casting, which comprises a body, wherein the body comprises a top plate and a bottom plate, a cavity is formed between the top plate and the bottom plate, a liquid inlet communicated with the cavity is formed in the middle of the top plate, a plurality of blades are arranged in the cavity, the cavity is divided into a plurality of flow channels by the blades, one side of each flow channel, far away from the liquid inlet, is opened to form a liquid outlet, and an opening is formed in the body corresponding to each flow channel and is formed in the top plate or the bottom plate; the side of the opening far away from the chamber is fixedly connected with a cover plate, and a positioning structure is arranged between the cover plate and the opening and can limit the position of the cover plate relative to the opening.
According to the closed impeller structure, the top plate or the bottom plate is provided with the opening, so that in the shell manufacturing process, the opening structure of the body part creates favorable conditions for coating and hanging and air drying in the flow channel, the wet strength of the body core can be ensured to resist the dewaxing expansion force, the high temperature strength of the body core can be ensured to resist the impact force and the buoyancy force of molten steel, a body casting with excellent quality is obtained, and then the cover plate is fixedly connected to the corresponding opening, so that the closed impeller with excellent performance can be obtained.
Preferably, the cover plate comprises a connecting part, one side of the connecting part, which is close to the chamber, is convexly provided with a positioning part, and the joint of the positioning part and the connecting part forms a first step surface; the opening sequentially comprises a positioning hole and a connecting hole along the direction far away from the cavity, the inner circumference size of the positioning hole is smaller than that of the connecting hole, and a second step surface is formed between the positioning hole and the connecting hole; the positioning hole is matched with the positioning part, the connecting part is arranged in the connecting hole in a penetrating mode, and the first step surface is attached to the second step surface; the positioning structure comprises a positioning part and a first step surface which are arranged on the cover plate, and a positioning hole and a second step surface which are arranged on the opening. By adopting the positioning structure, the cover plate and the opening can be accurately positioned.
Preferably, the connecting portion is arranged to be gradually expanded in a direction close to the cavity, the connecting hole is arranged to be gradually expanded in a direction away from the cavity, and a welding groove is formed between an outer periphery of the connecting portion and an inner periphery of the connecting hole. After the cover plate is arranged at the corresponding opening, the cover plate is welded at the welding groove through argon arc welding, so that the cover plate and the body are firmly connected.
Preferably, the openings are arranged along the path of the respective flow channel.
Preferably, the opening is arranged in a direction away from the liquid inlet.
Preferably, the side of the cover plate remote from the chamber is flush with the surface of the body.
Preferably, the depth of the welding groove is greater than or equal to 3 mm.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic structural view of a closed impeller configuration for facilitating investment casting in accordance with an embodiment of the present invention;
FIG. 2 is a top view of a closed impeller structure for facilitating investment casting in accordance with an embodiment of the present invention;
FIG. 3 is a partial structural view of an opening according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a cover plate according to an embodiment of the present invention;
fig. 5 is a schematic view of a connection structure of a cover plate and an opening according to an embodiment of the invention.
Reference numerals:
1-body; 11-a top plate; 12-a base plate; 13-a liquid inlet; 14-a blade; 15-a liquid outlet; 16-opening; 161-positioning holes; 162-a connection hole; 163-second step face; 2-cover plate; 21-a connecting part; 22-a positioning section; 23-first step surface.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, this embodiment provides a closed impeller structure convenient to investment casting, including body 1, this body 1 includes roof 11 and bottom plate 12, form the cavity between roof 11 and the bottom plate 12, the intermediate position of roof 11 is provided with the inlet 13 with the cavity intercommunication, be provided with a plurality of blades 14 in this cavity, a plurality of blades 14 separate the cavity for a plurality of runners, refer to fig. 2, 14 crisscross settings of length of blade in the cavity, and have a certain distance between short blade and the inlet 13, and long blade and short blade are the circumference equipartition along the central axis of body respectively. The side of each flow channel far away from the liquid inlet 13 is opened to form a liquid outlet 15. An opening 16 is arranged on the body 1 corresponding to each flow channel, the opening 16 is arranged on the top plate 11, the opening 16 is arranged along the path of the corresponding flow channel, and the opening 16 is arranged along the direction far away from the liquid inlet 13 in a gradually expanding manner; the side of the opening 16 remote from the chamber is fixedly connected with a cover plate 2, and a positioning structure is arranged between the cover plate 2 and the opening 16, and can define the position of the cover plate 2 relative to the opening 16.
Specifically, the cover plate 2 includes a connecting portion 21, a positioning portion 22 is convexly disposed on one side of the connecting portion 21 close to the cavity, and a first step surface 23 is formed at a connection position of the positioning portion 22 and the connecting portion 21; the opening 16 includes a positioning hole 161 and a connection hole 162 in order in a direction away from the chamber, an inner circumferential dimension of the positioning hole 161 is smaller than an inner circumferential dimension of the connection hole 162, and a second step surface 163 is formed between the positioning hole 161 and the connection hole 162. In this embodiment, the positioning hole 161 is adapted to the positioning portion 22. When the cover plate 2 is fastened at the opening 16, the positioning portion 22 is inserted into the positioning hole 161, the connecting portion 21 is inserted into the connecting hole 162, the first step surface 23 is attached to the second step surface 163, and a side of the cover plate 2 away from the cavity is flush with the surface of the body 1. That is, the positioning portion 22 and the first step surface 23 on the cover plate 2, and the positioning hole 161 and the second step surface 163 provided on the opening 16 form the above-described positioning structure.
Further, the connecting portion 21 is provided so as to be gradually expanded in a direction approaching the cavity, the connecting hole 162 is provided so as to be gradually expanded in a direction away from the cavity, and a triangular welding groove is formed between the outer periphery of the connecting portion 21 and the inner periphery of the connecting hole 162.
In the invention, the opening 16 is arranged on the top plate 11, in the shell manufacturing process, the opening structure of the body 1 part creates favorable conditions for coating and air drying in the flow channel, the wet strength of the body core can be ensured to resist the dewaxing expansion force, the high-temperature strength can resist the impact force and buoyancy force of molten steel, a body casting with excellent quality is obtained, then the cover plate 2 is arranged at the corresponding opening 16, and is welded at the welding slope through argon arc welding, so that the cover plate 2 and the body 1 are firmly connected, and the closed impeller with excellent performance can be obtained.
In practice, in order to fully guarantee the strength of the cover plate, the depth of the welding groove is greater than or equal to 3mm, the cover plate 2 and the body 1 are welded, then the residual welding materials are polished through a polishing machine, the cover plate 2 is welded on each opening 16 of the body 1, and the whole closed impeller is formed after welding and polishing. And finally, performing surface pickling passivation treatment on the welded part of the integral closed impeller after the welded part is qualified through dye penetrant inspection (the corrosion resistance of the cover plate is fully ensured).
The body of the closed gear is provided with the opening structure, so that on one hand, the impeller body is beneficial to manufacturing a shell with excellent quality, and the problem of manufacturing the shell of the closed impeller with a narrow flow passage and a large diameter is solved; on the other hand, the quick cleaning of the shell and the oxide skin in the runner of the impeller body is facilitated, and the shell cleaning efficiency of the closed impeller is greatly improved.
The opening 16 of the present embodiment is formed in the top plate 11, and the opening 16 may be formed in the bottom plate 12 in a case where the drying is performed in a horizontal plane.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not cause the essence of the corresponding technical solution to depart from the scope of the technical solution of the embodiments of the present invention, and are intended to be covered by the claims and the specification of the present invention.
Claims (7)
1. The utility model provides a closed impeller structure convenient to investment casting, includes the body, and this body includes roof and bottom plate, form the cavity between roof and the bottom plate the intermediate position of roof be provided with the inlet of cavity intercommunication is provided with a plurality of blades in this cavity, and is a plurality of the blade will the cavity is separated for a plurality of runners, the runner is kept away from open the setting in one side of inlet forms liquid outlet, its characterized in that:
an opening is formed in the position, corresponding to each flow channel, of the body, and the opening is formed in the top plate or the bottom plate;
the side of the opening far away from the chamber is fixedly connected with a cover plate, and a positioning structure is arranged between the cover plate and the opening and can limit the position of the cover plate relative to the opening.
2. The closed impeller structure for facilitating investment casting of claim 1 wherein:
the cover plate comprises a connecting part, one side of the connecting part, which is close to the cavity, is convexly provided with a positioning part, and a first step surface is formed at the connecting part of the positioning part and the connecting part;
the opening sequentially comprises a positioning hole and a connecting hole along the direction far away from the cavity, the inner circumference size of the positioning hole is smaller than that of the connecting hole, and a second step surface is formed between the positioning hole and the connecting hole;
the positioning hole is matched with the positioning part, the connecting part is arranged in the connecting hole in a penetrating mode, and the first step surface is attached to the second step surface;
the positioning structure comprises a positioning part and a first step surface which are arranged on the cover plate, and a positioning hole and a second step surface which are arranged on the opening.
3. The closed impeller structure for facilitating investment casting of claim 2 wherein:
the connecting part is arranged along the direction close to the cavity in a gradually expanding mode, the connecting hole is arranged along the direction far away from the cavity in a gradually expanding mode, and a welding groove is formed between the outer periphery of the connecting part and the inner periphery of the connecting hole.
4. The closed impeller structure for facilitating investment casting of claim 1 wherein:
the openings are arranged along the path of the respective flow channels.
5. The closed impeller structure for facilitating investment casting of claim 1 wherein:
the opening is arranged along the direction far away from the liquid inlet in a gradually expanding manner.
6. The closed impeller structure for facilitating investment casting of claim 1 wherein:
the side of the cover plate far away from the cavity is flush with the surface of the body.
7. The closed impeller structure for facilitating investment casting of claim 3 wherein:
the depth of the welding groove is greater than or equal to 3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111015776.7A CN113606185A (en) | 2021-08-31 | 2021-08-31 | Closed impeller structure convenient to investment casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111015776.7A CN113606185A (en) | 2021-08-31 | 2021-08-31 | Closed impeller structure convenient to investment casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113606185A true CN113606185A (en) | 2021-11-05 |
Family
ID=78342429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111015776.7A Pending CN113606185A (en) | 2021-08-31 | 2021-08-31 | Closed impeller structure convenient to investment casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113606185A (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU778900A1 (en) * | 1978-06-29 | 1980-11-15 | Предприятие П/Я Р-6767 | Casting pattern |
| JPH1177238A (en) * | 1997-09-03 | 1999-03-23 | Ebara Corp | Lost foam pattern for casting |
| US6019927A (en) * | 1997-03-27 | 2000-02-01 | Galliger; Nicholas | Method of casting a complex metal part |
| US20040255917A1 (en) * | 2003-06-20 | 2004-12-23 | Mokry Peter G. | Impeller and a supercharger for an internal combustion engine |
| WO2005116454A1 (en) * | 2004-05-28 | 2005-12-08 | Hmy, Ltd. | Impeller for supercharger and method of manufacturing the same |
| CN101963163A (en) * | 2010-11-12 | 2011-02-02 | 合肥大元泵业股份有限公司 | Welded impeller of canned motor pump used for central air conditioner |
| CN102927042A (en) * | 2012-11-29 | 2013-02-13 | 无锡艾比德泵业有限公司 | Impeller of centrifugal pump |
| CN103894553A (en) * | 2014-02-28 | 2014-07-02 | 浙江科尔泵业股份有限公司 | Integral impeller casting process of narrow-sprue centrifugal pump and impeller mould case |
| CN109202019A (en) * | 2018-11-16 | 2019-01-15 | 襄阳五二五泵业有限公司 | A kind of moulding process casting double shrouded wheel |
| CN110653579A (en) * | 2019-10-28 | 2020-01-07 | 襄阳五二五泵业有限公司 | Method for manufacturing closed impeller with narrow flow passage |
| CN110860652A (en) * | 2019-11-15 | 2020-03-06 | 广东阿诺诗厨卫有限公司 | Combined impeller manufacturing method and impeller |
| CN112170780A (en) * | 2020-09-23 | 2021-01-05 | 鹰普（中国）有限公司 | Machining process for casting with double-layer structure |
-
2021
- 2021-08-31 CN CN202111015776.7A patent/CN113606185A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU778900A1 (en) * | 1978-06-29 | 1980-11-15 | Предприятие П/Я Р-6767 | Casting pattern |
| US6019927A (en) * | 1997-03-27 | 2000-02-01 | Galliger; Nicholas | Method of casting a complex metal part |
| JPH1177238A (en) * | 1997-09-03 | 1999-03-23 | Ebara Corp | Lost foam pattern for casting |
| US20040255917A1 (en) * | 2003-06-20 | 2004-12-23 | Mokry Peter G. | Impeller and a supercharger for an internal combustion engine |
| WO2005116454A1 (en) * | 2004-05-28 | 2005-12-08 | Hmy, Ltd. | Impeller for supercharger and method of manufacturing the same |
| CN101963163A (en) * | 2010-11-12 | 2011-02-02 | 合肥大元泵业股份有限公司 | Welded impeller of canned motor pump used for central air conditioner |
| CN102927042A (en) * | 2012-11-29 | 2013-02-13 | 无锡艾比德泵业有限公司 | Impeller of centrifugal pump |
| CN103894553A (en) * | 2014-02-28 | 2014-07-02 | 浙江科尔泵业股份有限公司 | Integral impeller casting process of narrow-sprue centrifugal pump and impeller mould case |
| CN109202019A (en) * | 2018-11-16 | 2019-01-15 | 襄阳五二五泵业有限公司 | A kind of moulding process casting double shrouded wheel |
| CN110653579A (en) * | 2019-10-28 | 2020-01-07 | 襄阳五二五泵业有限公司 | Method for manufacturing closed impeller with narrow flow passage |
| CN110860652A (en) * | 2019-11-15 | 2020-03-06 | 广东阿诺诗厨卫有限公司 | Combined impeller manufacturing method and impeller |
| CN112170780A (en) * | 2020-09-23 | 2021-01-05 | 鹰普（中国）有限公司 | Machining process for casting with double-layer structure |
Non-Patent Citations (1)
| Title |
|---|
| 李文广 等: "《泵叶轮正反问题》", 31 March 2020, 江苏大学出版社, pages: 95 - 101 * |
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