CN219452499U - Impeller for improving passing performance of impurity pump by adopting semi-open structure - Google Patents
Impeller for improving passing performance of impurity pump by adopting semi-open structure Download PDFInfo
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- CN219452499U CN219452499U CN202320652370.8U CN202320652370U CN219452499U CN 219452499 U CN219452499 U CN 219452499U CN 202320652370 U CN202320652370 U CN 202320652370U CN 219452499 U CN219452499 U CN 219452499U
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Abstract
The utility model relates to an impeller for improving the passing performance of an impurity pump by adopting a semi-open structure, which comprises the following components: impeller back cover plate, blade inlet edge, blade rim side; the impeller back cover plate, the blade inlet edge and the blade rim side are cast integrally, the front edge of the blade inlet edge is swept back by 80-110 degrees, and the connecting line from the intersection of the blade inlet edge and the blade rim side to the center of the impeller is used as a reference to be rounded to two sides, so that the impeller is in smooth transition. According to the impeller adopting the semi-open structure to improve the passing performance of the impurity pump, the effective overflow area of the impeller inlet is increased through the design of the forward sweep of the inlet edge, the passing capacity of larger particles is realized, the winding resistance of the impeller inlet is improved, and the blocking resistance and the reliability of the semi-open structure impeller are improved to a great extent.
Description
Technical Field
The utility model relates to an impeller, in particular to an impeller which can increase the effective overflow area of an inlet part of the impeller and is convenient for improving the passing performance of an impurity pump by adopting a semi-open structure of large particles and long fiber substances.
Background
The semi-open impeller is a non-blocking pump impeller structure with only a back cover plate and blades, and is mainly used for conveying sewage and dirt or medium containing non-corrosive solid suspended matters such as fibers, paper scraps, particles and the like. The design method of the traditional semi-open impeller is basically the same as that of a common closed impeller, the flow area of an impeller inlet is not increased, long fiber substances are easy to wind and block a flow passage at the impeller inlet with low flow velocity, so that the pump cannot work normally, and even a motor is burnt. Therefore, the blocking resistance and reliability are important quality factors of the impurity pump to be ensured.
The semi-open impeller and the front cover plate are divided into two parts, and the clearance between the two parts is generally 0.25-0.75mm. Typically the inlet edges of the semi-open impeller are on the same axial plane, and there are also non-axial planes but typically differ only by 5 ° -10 °. The impeller inlet edge 4 (figure 1) of the similar product has narrow space and small flow area, so that the size of the passing particles is limited, and long fiber materials are easy to wind at the impeller inlet. Therefore, the semi-open impeller has poor non-clogging performance, and cannot deliver large particles and long fiber materials.
Disclosure of Invention
In view of the above problems, a main object of the present utility model is to provide an impeller which can increase the effective flow area at the inlet of the impeller, and facilitate improvement of the passage performance of an impurity pump by using a semi-open structure of large particles and long fiber materials.
The utility model solves the technical problems by the following scheme: an impeller for improving the passing performance of an impurity pump by adopting a semi-open structure, the impeller for improving the passing performance of the impurity pump by adopting the semi-open structure comprises: impeller back cover plate, blade inlet edge, blade rim side; the impeller back cover plate, the blade inlet edge and the blade rim side are cast integrally, the front edge of the blade inlet edge is swept back by 80-110 degrees, and the connecting line from the intersection of the blade inlet edge and the blade rim side to the center of the impeller is used as a reference to be rounded to two sides, so that the impeller is in smooth transition.
In a specific embodiment of the present utility model, the rounded range θ is 20 ° to 40 °.
In the specific embodiment of the present utility model, the rounded range θ is 30 °.
In a specific embodiment of the utility model, the leading edge of the inlet edge of the blade is swept back 100 °.
In a specific embodiment of the present utility model, the streamline length range of the blade inlet edge is the streamline length range of the blade rim side: 1/3-1/2.
The utility model has the positive progress effects that: according to the impeller adopting the semi-open structure to improve the passing performance of the impurity pump, the effective overflow area of the impeller inlet is increased through the design of the forward sweep of the inlet edge, the passing capacity of larger particles is realized, the winding resistance of the impeller inlet is improved, and the blocking resistance and the reliability of the semi-open structure impeller are improved to a great extent.
Drawings
Fig. 1 is a schematic structural diagram of a conventional similar product.
Fig. 2 is a schematic view of the overall structure of the present utility model (showing the rounding range).
Fig. 3 is a schematic view of the overall structure of the present utility model (after being rounded on the basis of fig. 2).
Fig. 4 is a graph showing a change in a vane passage area using a conventional impeller.
Fig. 5 is a graph of the variation of the vane passage area of an impeller using the present utility model.
The following are names corresponding to the reference numerals in the present utility model:
the impeller comprises an impeller rear cover plate 1, a blade inlet edge 2, a blade rim side 3 and an impeller inlet edge 4 of similar products.
Detailed Description
The following description of the preferred embodiments of the present utility model is given with reference to the accompanying drawings, so as to explain the technical scheme of the present utility model in detail.
Fig. 2 is a schematic diagram of the overall structure of the present utility model (showing the rounding range), and fig. 3 is a schematic diagram of the overall structure of the present utility model (after rounding on the basis of fig. 2), as shown in fig. 2-3: the impeller for improving the passing performance of the impurity pump by adopting the semi-open structure provided by the utility model comprises the following components: the impeller rear cover plate, the blade inlet edge 2 and the blade rim side 3; the impeller back cover plate, the blade inlet edge 2 and the blade rim side 3 are cast integrally, the front edge of the blade inlet edge 2 is swept back by 80-110 degrees, preferably 100 degrees, and the line from the intersection of the blade inlet edge and the blade rim side to the center of the impeller is used as a reference to be rounded to two sides so as to realize smooth transition, and the rounding range takes an angle theta of 20-40 degrees, preferably 30 degrees; in a specific implementation process, the values of the parameters can be changed according to actual requirements.
In a specific implementation of the utility model, the streamline length range of the impeller inlet edge is the streamline length range of the blade rim side: 1/3-1/2; in a specific implementation process, the values of the parameters can be changed according to actual requirements.
The front edge of the inlet edge of the impeller is swept back by 80-110 degrees, so that the effective overflow area of the inlet part of the impeller is greatly increased, the rounding range of the intersection of the inlet edge and the rim side of the blade is 20-40 degrees, the inlet edge is smoothly transited, the overflow area is further increased, the passing performance of impurities is improved, large particles and long fiber substances are conveniently passed, and the high passing performance of the impurities such as large particles and long fibers is further improved.
The following is an application of a specific embodiment example:
taking the specific rotation speed n s Design of two sets of impellers for vane runner effective flow area contrast for test pump=181, parameters are as follows: design flow q=1200m 3 and/H, the lift H=26m, and the rotating speed n=990 r/min. The model No. 1 adopts a conventional design method, the model No. 2 adopts a design method that the front edge is swept back by 80 degrees and is rounded to a range of 30 degrees, the change curves of the blade channel areas of the model No. 1 and the model No. 2 are shown in the following figures 4-5, and the change curve of the blade channel area of the model No. 4 is a graph of the change curve of the blade channel area of a conventional impellerFIG. 5 is a graph showing the change of the area of a vane passage of an impeller according to the present utility model, wherein the area of the vane passage from the inlet position of the impeller to 70% of the center line of the flow passage is greater than that of model 1 in model 2, and the difference is 3670mm higher than that in model 1 2 About 1.23 times, if the impurity particles are taken in the form of spheres, the diameter of the large particles can be increased from 72.5mm to 101.4mm. Although the flow area of model No. 1 is gradually larger than that of model No. 2 after 70% of the center line of the flow channel, the flow velocity near the outlet of the impeller is very high, and large particles and long fiber substances screened out from the inlet of the impeller are not blocked in the flow channel under the action of high-speed centrifugal force. The design of the sweepback of the front edge of the inlet edge substantially increases the effective overflow area of the impeller inlet, realizes the passing capability of larger particles, improves the winding resistance of the impeller inlet, and greatly improves the blocking resistance and reliability of the semi-open structure impeller.
The foregoing has shown and described the basic principles and main features of the present utility model and the advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the foregoing embodiments, which have been described in the foregoing embodiments and description merely illustrates the principles of the utility model, and that various changes and modifications may be effected therein without departing from the spirit and scope of the utility model as defined in the appended claims and their equivalents.
Claims (5)
1. An impeller for improving the passing performance of an impurity pump by adopting a semi-open structure is characterized in that: the impeller for improving the passing performance of the impurity pump by adopting the semi-open structure comprises: impeller back cover plate, blade inlet edge, blade rim side; the impeller back cover plate, the blade inlet edge and the blade rim side are cast integrally, the front edge of the blade inlet edge is swept back by 80-110 degrees, and the connecting line from the intersection of the blade inlet edge and the blade rim side to the center of the impeller is used as a reference to be rounded to two sides, so that the impeller is in smooth transition.
2. The impeller for improving the passage performance of an impurity pump using a semi-open structure according to claim 1, wherein: the rounding range θ is 20 ° to 40 °.
3. The impeller for improving the passage performance of an impurity pump using a semi-open structure according to claim 2, wherein: the rounding range θ is 30 °.
4. The impeller for improving the passage performance of an impurity pump using a semi-open structure according to claim 1, wherein: the leading edge of the inlet edge of the vane is swept back 100 deg..
5. The impeller for improving the passage performance of an impurity pump using a semi-open structure according to claim 1, wherein: the streamline length range of the blade inlet edge is the streamline length range of the blade rim side: 1/3-1/2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320652370.8U CN219452499U (en) | 2023-03-29 | 2023-03-29 | Impeller for improving passing performance of impurity pump by adopting semi-open structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320652370.8U CN219452499U (en) | 2023-03-29 | 2023-03-29 | Impeller for improving passing performance of impurity pump by adopting semi-open structure |
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| Publication Number | Publication Date |
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| CN219452499U true CN219452499U (en) | 2023-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320652370.8U Active CN219452499U (en) | 2023-03-29 | 2023-03-29 | Impeller for improving passing performance of impurity pump by adopting semi-open structure |
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| CN (1) | CN219452499U (en) |
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2023
- 2023-03-29 CN CN202320652370.8U patent/CN219452499U/en active Active
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