Connecting structure of impeller and rotor shaft in water pump
By designing the external threaded column, connecting sleeve, inverted part and shoulder structure in the water pump, a simple and stable connection between the impeller and the rotor shaft is achieved, solving the problem of cumbersome connection operation in the existing technology, and improving assembly efficiency and connection stability.
Patent Information
- Application Number
- CN202420929071.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-04-30
AI Technical Summary
The connection structure of the impeller and rotor shaft in existing water pumps is complicated to operate, and the assembly steps are numerous and complex.
A connection structure including external threaded columns, connecting sleeves, inverted portions and shoulder surfaces is designed. The stable connection between the impeller and the rotor shaft is achieved by screwing into the wheel hub. The anti-falling effect is strengthened by using the inverted portions and the stopper head, and the anti-falling effect is strengthened through Injection molding forms the overall structure of the connecting sleeve and the hub to enhance the bonding strength.
The assembly steps are simplified, the stability and convenience of connection are improved, the machining accuracy and machining difficulty of parts are reduced, and the axial limit strength of the impeller and rotor shaft is enhanced.
Smart Images
Figure CN222141617U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of water pumps and relates to a connection structure, in particular to a connection structure between an impeller and a rotor shaft in a water pump. Background Art
[0002] A water pump is a machine used to transport liquid or increase the pressure of liquid, generally comprising a motor, a pump casing and an impeller arranged in the pump casing, wherein the motor rotor shaft extends into the pump casing and is fixedly connected to the impeller.
[0003] At present, the connection method between the rotor shaft and the impeller is such as a vertical long-axis pump impeller fixing structure disclosed in the Chinese Patent Library (application number: 201711409232.2), which includes a pump shaft, an impeller body, an impeller retaining ring and a connecting plate that are connected to each other to form an integral body; the pump shaft includes a first section shaft and a second section shaft; the impeller body includes a front cover plate, an impeller hub, impeller blades and a rear cover plate; it also includes an annular groove for placing an impeller retaining ring at the adjacent position of the first section shaft and the second section shaft, and the impeller retaining ring is placed in the annular groove; the impeller hub extends backward from the rear cover plate and then stops at the annular groove, and the impeller hub and the impeller retaining ring are close together to achieve circumferential positioning of the impeller body; the impeller hub has a fixing blind hole with an opening facing the rear of the impeller body; the connecting plate has a fixing hole, and the impeller hub has a matching hole that matches the fixing hole, and the connecting plate and the impeller hub are connected by screws to achieve axial positioning of the impeller body.
[0004] In the above-mentioned fixing structure, the pump shaft and the impeller body are fixedly connected by using an impeller clamping ring and a connecting plate, and the entire operation process is relatively complex and complicated. Utility Model Content
[0005] The utility model aims to solve the above problems in the prior art and proposes a connection structure between an impeller and a rotor shaft in a water pump which is easy to connect.
[0006] The purpose of the utility model can be achieved through the following technical solutions: a connection structure between an impeller and a rotor shaft in a water pump, the impeller is a plastic part and includes a columnar hub, characterized in that the connection structure includes an external threaded column formed on the front end surface of the rotor shaft, and the external threaded column and the rotor shaft are coaxially arranged; a center hole is axially opened at the rear end of the hub, a connecting sleeve made of metal material is fixed in the center hole, and the external threaded column is screwed into the connecting sleeve; a circle of undercut parts is integrally formed on the rear end surface of the hub, the undercut parts are strip-shaped and the length extends along the axial direction of the rotor shaft; the outer wall of the rotor shaft has a shaft shoulder surface that is annular and coaxial with the rotor shaft, and the rear end of the undercut part is buckled on the shaft shoulder surface.
[0007] During assembly, the wheel hub is screwed in, and the undercut part made of plastic material will move backward with the wheel hub and eventually be undercut on the shoulder surface of the shaft to limit the forward movement of the wheel hub and prevent the impeller from loosening and falling off. In other words, during actual assembly, only the wheel hub needs to be screwed in to complete the stable connection between the impeller and the rotor shaft, which effectively simplifies the assembly steps and has the advantages of convenient and easy assembly.
[0008] In the connection structure between the impeller and the rotor shaft in the above-mentioned water pump, the above-mentioned undercut portion is composed of a straight strip-shaped support body and a stopper formed on the rear end side wall of the support body. The front end of the support body is connected to the hub, and the stopper is tightly pressed against the shaft shoulder surface, which has the advantages of simple structure and stable connection.
[0009] In the connection structure between the impeller and the rotor shaft in the above-mentioned water pump, the cross-sections of the support body and the stopper are both in the shape of an arc coaxial with the rotor shaft, so as to increase the contact area between the stopper and the shaft shoulder surface and enhance the anti-falling effect of the impeller.
[0010] In the connection structure between the impeller and the rotor shaft in the above-mentioned water pump, there is a gap between the front end surface of the rotor shaft and the connecting sleeve, which can reduce the processing accuracy of each component and the processing difficulty while preventing the impeller from falling off.
[0011] In the connection structure between the impeller and the rotor shaft in the above-mentioned water pump, the connection sleeve and the hub are formed into a whole by injection molding, so as to effectively enhance the connection strength between the two.
[0012] In the connection structure between the impeller and the rotor shaft of the above-mentioned water pump, an annular groove is coaxially opened on the outer wall of the connecting sleeve, and the hub extends into the annular groove to form a retaining ring whose shape and size match the annular groove, thereby strengthening the axial limiting strength formed between the hub and the connecting sleeve and making the connection between the two more stable.
[0013] In the connection structure between the impeller and the rotor shaft in the above-mentioned water pump, there are at least two annular grooves distributed along the axial direction of the connecting sleeve, and the annular grooves and retaining rings are the same in number and have one-to-one corresponding positions, so as to further enhance the bonding strength between the hub and the connecting sleeve.
[0014] In the connection structure between the impeller and the rotor shaft in the above-mentioned water pump, the axial cross section of the annular groove is in the shape of a U.
[0015] Compared with the prior art, the connection structure between the impeller and the rotor shaft in the water pump has the following advantages:
[0016] 1. During the actual assembly, the impeller and the rotor shaft can be stably connected by simply screwing in the hub, which effectively simplifies the assembly steps and has the advantages of convenient and easy assembly.
[0017] 2. With the cooperation of the retaining ring and the annular groove, the axial limiting strength formed between the wheel hub and the connecting sleeve can be effectively strengthened, making the connection between the two more stable. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 is a schematic diagram of this connection structure.
[0019] Figure 2 yes Figure 1 A magnified schematic diagram of center A.
[0020] In the figure, 1, impeller; 1a, hub; 1b, center hole; 1c, undercut portion; 1c1, support body; 1c2, stopper head; 1d, stopper ring; 2, rotor shaft; 2a, external threaded column; 2b, shaft shoulder surface; 3, connecting sleeve. DETAILED DESCRIPTION
[0021] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
[0022] like Figure 1 As shown, the impeller 1 is arranged on the front side of the rotor shaft 2. The impeller 1 is a plastic part. The impeller 1 includes a cylindrical hub 1a, and the hub 1a and the rotor shaft 2 are coaxially arranged.
[0023] like Figure 1 and Figure 2 As shown, the connection structure between the impeller and the rotor shaft in the water pump includes an external threaded column 2a formed on the front end surface of the rotor shaft 2. The external threaded column 2a and the rotor shaft 2 are an integrated structure and the two are coaxially arranged. A center hole 1b is axially opened at the rear end of the hub 1a, and a connecting sleeve 3 made of metal material is fixed in the center hole 1b, and the connecting sleeve 3 is coaxially arranged with the hub 1a. The external threaded column 2a is screwed into the connecting sleeve 3, and a circle of undercuts 1c is integrally formed on the rear end surface of the hub 1a. The undercuts 1c are strip-shaped and the length extends along the axial direction of the rotor shaft 2. The outer wall of the rotor shaft 2 has a shaft shoulder surface 2b that is annular and coaxial with the rotor shaft 2, and the rear end of the undercut 1c is buckled on the shaft shoulder surface 2b.
[0024] During assembly, the wheel hub 1a is screwed in, and the undercut portion 1c made of plastic material will move backward with the wheel hub 1a and eventually be undercut on the shaft shoulder surface 2b to limit the forward movement of the wheel hub 1a and prevent the impeller 1 from loosening and falling off. That is to say, during actual assembly, it is only necessary to screw in the wheel hub 1a to complete the stable connection between the impeller 1 and the rotor shaft 2, thereby effectively simplifying the assembly steps and having the advantages of convenient and easy assembly.
[0025] in,
[0026] The metal material can be stainless steel material or aluminum alloy material.
[0027] Preferably, the number of the倒扣 parts 1c is two, and the structure of the倒扣 part 1c is as follows: The倒扣 part 1c is composed of a straight strip-shaped support body 1c1 and a stop head 1c2 formed on the rear side wall of the support body 1c1. The front end of the support body 1c1 is connected to the hub 1a, and the stop head 1c2 is tightly pressed against the shoulder surface 2b. Further explanation, the cross-sections of both the support body 1c1 and the stop head 1c2 are circular arcs coaxial with the rotor shaft 2, so as to increase the contact area between the stop head 1c2 and the shoulder surface 2b and strengthen the anti-detachment effect of the impeller 1.
[0028] The connection mode between the connecting sleeve 3 and the hub 1a is as follows: As Figure 2 shown, the connecting sleeve 3 and the hub 1a are formed into an integral body by injection molding to effectively strengthen the bonding strength between the two. Further explanation, an annular groove is coaxially opened on the outer side wall of the connecting sleeve 3, and the hub 1a extends into the annular groove to form a retaining ring 1d whose shape and size are both matched with the annular groove, strengthening the axial limiting strength formed between the hub 1a and the connecting sleeve 3 and making the connection between the two more stable. Preferably, the axial cross-section of the annular groove is in a U shape; there are at least two annular grooves and they are distributed along the axial direction of the connecting sleeve 3, and the number of the annular grooves and the retaining ring 1d is the same and their positions correspond one by one to further strengthen the bonding strength between the hub 1a and the connecting sleeve 3.
[0029] In the actual product, there is a gap between the front end face of the rotor shaft 2 and the connecting sleeve 3, which can reduce the machining accuracy of each component and the machining difficulty on the premise of achieving the anti-detachment effect of the impeller 1.
[0030] The specific embodiments described in this article are only examples to illustrate the spirit of the present invention. Those skilled in the technical field to which the present invention belongs can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.
Claims
1. A connection structure between an impeller and a rotor shaft in a water pump, wherein the impeller (1) is a plastic part and comprises a cylindrical hub (1a), characterized in that: The connection structure comprises an external thread column (2a) formed on the front end surface of a rotor shaft (2), and the external thread column (2a) and the rotor shaft (2) are coaxially arranged; a center hole (1b) is axially opened at the rear end of the hub (1a), a connecting sleeve (3) made of a metal material is fixed in the center hole (1b), and the external thread column (2a) is screwed into the connecting sleeve (3); a circle of undercut portions (1c) are integrally formed on the rear end surface of the hub (1a), the undercut portions (1c) are strip-shaped and extend along the axial direction of the rotor shaft (2); the outer wall of the rotor shaft (2) has a shaft shoulder surface (2b) that is annular and coaxial with the rotor shaft (2), and the rear end of the undercut portion (1c) is buckled on the shaft shoulder surface (2b).
2. The connection structure between the impeller and the rotor shaft in the water pump according to claim 1, characterized in that: The above-mentioned undercut portion (1c) is composed of a straight strip-shaped support body (1c1) and a stopper (1c2) formed on the rear end side wall of the support body (1c1); the front end of the support body (1c1) is connected to the wheel hub (1a), and the stopper (1c2) is tightly pressed against the shaft shoulder surface (2b).
3. The connection structure between the impeller and the rotor shaft in the water pump according to claim 2, characterized in that: The cross sections of the support body (1c1) and the stopper head (1c2) are both in the shape of an arc coaxial with the rotor shaft (2).
4. The connection structure between the impeller and the rotor shaft in a water pump according to claim 1, 2 or 3, characterized in that: There is a gap between the front end surface of the rotor shaft (2) and the connecting sleeve (3).
5. The connection structure between the impeller and the rotor shaft in the water pump according to claim 1, characterized in that: The connecting sleeve (3) and the wheel hub (1a) are formed into a whole by injection molding.
6. The connection structure between the impeller and the rotor shaft in the water pump according to claim 5, characterized in that: An annular groove is coaxially formed on the outer side wall of the connecting sleeve (3), and the wheel hub (1a) extends into the annular groove to form a retaining ring (1d) having a shape and size matching the annular groove.
7. The connection structure between the impeller and the rotor shaft in the water pump according to claim 6, characterized in that: There are at least two annular grooves distributed along the axial direction of the connecting sleeve (3), and the annular grooves and the retaining ring (1d) are the same in number and have one-to-one corresponding positions.
8. The connection structure between the impeller and the rotor shaft in a water pump according to claim 6 or 7, characterized in that: The axial cross section of the annular groove is in the shape of a U-shape.