Newly induced wheel connection structure
By using the new inducer connection structure, the pump shaft front end is sleeved in the impeller hub and the rotational torque is transmitted through the impeller connection key and the inducer connection key. Combined with the shaft head bolts and anti-reverse washers for fastening, the problem of needing to replace the pump shaft in the existing technology is solved, and cost savings and shortened construction period are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 大连帝国屏蔽电泵有限公司
- Filing Date
- 2025-06-27
- Publication Date
- 2026-06-23
AI Technical Summary
Existing technologies require replacing the pump shaft when adding an inducer, resulting in long construction periods and high costs.
A new inducer connection structure is adopted, in which the front end of the pump shaft is sleeved in the impeller hub. Rotational torque is transmitted by the impeller connection key and the inducer connection key, and the inducer is fastened by the shaft head bolt and the anti-reverse washer, so as to achieve coaxiality and fastening and avoid replacing the pump shaft.
The installation of the inducer wheel was achieved without replacing the pump shaft, saving costs and shortening the construction period.
Smart Images
Figure CN224396750U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of electric pumps, specifically to a new inducer wheel connection structure. Background Technology
[0002] With the advancement and improvement of chemical processes, the performance requirements for supporting products are also increasing. In the field of pump products, as processes improve, the cavitation performance of pump products must also be improved. Currently, the main method to improve the cavitation performance of pump products is to add an inducer. Existing structures for adding an inducer include... Figure 1-4 As shown, the inducer is positioned by the inner diameter of its hub. The pump shaft extends beyond the impeller hub. The inducer is mounted on the pump shaft and shares a key with the impeller. The outer diameter of the pump shaft and the inner diameter of the inducer hub ensure the coaxiality of the impeller and inducer. The impeller connection key transmits rotational torque. Shaft bolts and thrust washers are used to secure the inducer, impeller, and pump shaft. However, adding an inducer requires replacing the existing pump shaft, which is time-consuming and expensive. Utility Model Content
[0003] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a new inducer connection structure.
[0004] The technical solution adopted by this utility model to achieve the above objectives is as follows:
[0005] The new inducer connection structure includes a pump shaft, an impeller, and an inducer. The front end of the pump shaft is fitted inside the impeller hub of the impeller. The outer diameter of the pump shaft is connected to the inner diameter of the impeller hub by an impeller connecting key. The rear end face of the inducer hub of the inducer is provided with a shaft platform, which is fitted inside the impeller hub. The outer diameter of the shaft platform is connected to the inner diameter of the impeller hub by an inducer connecting key. Fasteners are installed on the inducer hub, and the inducer is fastened to the front end of the pump shaft by the fasteners. The rear end face of the inducer hub is pressed against the impeller hub by the fasteners.
[0006] The fastener is a shaft head bolt. The inducer hub has an axially penetrating mounting hole. The inducer is fastened to the front end of the pump shaft by a shaft head bolt inserted into the mounting hole. The rear end face of the inducer hub is pressed against the impeller hub by the shaft head bolt.
[0007] A backlash washer is installed between the shaft head bolt and the front end of the inducer wheel hub.
[0008] The feature of this utility model is that when adding an inducer wheel, there is no need to replace the pump shaft, which saves costs and reduces the construction period. Attached Figure Description
[0009] Figure 1 It is the existing inducer wheel connection structure;
[0010] Figure 2 yes Figure 1 A magnified view of a portion at point M;
[0011] Figure 3 It is an existing inducer structure;
[0012] Figure 4 yes Figure 2 BB view;
[0013] Figure 5 This is a schematic diagram of the structure of this utility model;
[0014] Figure 6 yes Figure 5 A magnified view of N local points;
[0015] Figure 7 This is a schematic diagram of the inducer structure of this utility model;
[0016] Figure 8 yes Figure 7 AA view;
[0017] Figure 9 This is a schematic diagram of the present invention without the inducer wheel installed.
[0018] The components include: 1. Pump shaft; 2. Impeller; 21. Impeller hub; 3. Inducer wheel; 31. Inducer wheel hub; 32. Shaft base; 33. Mounting hole; 4. Impeller connecting key; 5. Inducer wheel connecting key; 6. Shaft head bolt; 7. Anti-reverse washer. Detailed Implementation
[0019] like Figure 5-8As shown, this utility model is a novel inducer connection structure, including a pump shaft 1, an impeller 2, and an inducer 3. The front end of the pump shaft 1 is sleeved inside the impeller hub 21 of the impeller 2, meaning the length of the pump shaft 1 does not exceed the impeller hub 21. The outer diameter of the pump shaft 1 and the inner diameter of the impeller hub 21 are connected by an impeller connecting key 4. The impeller 2 is coaxial with the pump shaft 1 and transmits rotational torque through the impeller connecting key 4. The inducer 3 is positioned by the outer diameter of the inducer hub 31. Specifically, the rear end face of the inducer hub 31 of the inducer 3 is provided with an integral shaft platform 32, which is sleeved inside the impeller hub 21. The outer diameter of the shaft platform 32 and the inner diameter of the impeller hub 21 are connected by an inducer connecting key 4. The guide wheel is connected by a key 31. The coaxiality of the inducer wheel 3 is ensured by the impeller hub 21. The inducer wheel 3 is connected by an inducer wheel key 5, which transmits rotational torque through the impeller 2. Fasteners, namely shaft head bolts 6, are installed on the inducer wheel hub 31. The inducer wheel hub 31 has an axially penetrating mounting hole 33. The inducer wheel 3 is fastened to the front end of the pump shaft 1 by the shaft head bolt 6 inserted in the mounting hole 33. A backlash washer 7 is installed between the shaft head bolt 6 and the front end of the inducer wheel hub 31. The rear end face of the inducer wheel hub 31 is pressed against the impeller hub 21 by the shaft head bolt 6. The inducer wheel 3 and the impeller 2 are fastened to the pump shaft 1 by the shaft head bolt 6 and the backlash washer 7.
[0020] This invention is applicable to both structures without and with an inducer; when operating without an inducer, such as Figure 9 As shown, impeller 2 is connected to pump shaft 1 via impeller connecting key 4. Impeller 2 is concentric with pump shaft 1. Torque is transmitted using impeller connecting key 4. Impeller 2 and pump shaft 1 are secured using relatively short shaft head bolts 6 and corresponding anti-reverse washers 7. When an inducer is present, pump shaft 1 does not need to be replaced. The original shaft head bolts 6 and anti-reverse washers 7 are removed. The shaft base 32 of inducer 1 is installed in impeller hub 21 and connected via inducer connecting key 5. Then, inducer 3 and impeller 2 are secured to pump shaft 1 using relatively long shaft head bolts 6 and corresponding anti-reverse washers 7. When switching between the two operating conditions, to ensure the performance, only appropriate shaft head bolts 6 and anti-reverse washers 7 need to be selected for tightening. Pump shaft 1 does not need to be replaced, saving costs and reducing construction time.
[0021] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope of the technology disclosed in the present utility model, based on the technical solution and inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A novel inducer wheel connection structure, characterized in that: The pump includes a pump shaft, an impeller, and an inducer. The front end of the pump shaft is fitted inside the impeller hub of the impeller. The outer diameter of the pump shaft is connected to the inner diameter of the impeller hub by an impeller connecting key. The rear end face of the inducer hub of the inducer is provided with a shaft platform, which is fitted inside the impeller hub. The outer diameter of the shaft platform is connected to the inner diameter of the impeller hub by an inducer connecting key. Fasteners are installed on the inducer hub, and the inducer is fastened to the front end of the pump shaft by the fasteners. The rear end face of the inducer hub is pressed against the impeller hub by the fasteners.
2. The novel inducer connection structure as described in claim 1, characterized in that: The fastener is a shaft head bolt. The inducer hub has an axially penetrating mounting hole. The inducer is fastened to the front end of the pump shaft by a shaft head bolt inserted into the mounting hole. The rear end face of the inducer hub is pressed against the impeller hub by the shaft head bolt.
3. The novel inducer connection structure as described in claim 2, characterized in that: A backlash washer is installed between the shaft head bolt and the front end of the inducer wheel hub.