Impeller structure of a canned motor pump

Abstract

The present invention provides an impeller structure of a canned pump, including an impeller body and a driving shaft, a flow channel is arranged in the impeller body, a hub is arranged at the rear end center position of the impeller body, a central shaft hole for connecting with the driving shaft is arranged at the center position of the hub, a medium inlet is arranged at the front end of the impeller body, a medium outlet is arranged on the blades of the impeller body, the medium inlet is connected with the medium outlet through the flow channel, a plurality of annular protrusions are arranged along the axial direction of the outer periphery of the hub, an inclined surface is arranged on the upper part of the annular protrusion, and the angle between the inclined surface and the horizontal plane is 30° to 60°. When the driving shaft of the present invention drives the impeller to rotate, the annular protrusion will also rotate with the impeller, so that when the high-temperature medium comes to the gap between the hub and the pump body, the annular protrusion will generate a centrifugal force downward along the inclined surface, thereby preventing the high-temperature medium from continuing to flow upward to the sealing structure, thereby preventing the high-temperature medium from leaking to the sealing structure.

Description

Technical Field

[0001] The invention relates to the field of canned pumps, and in particular to an impeller structure of a canned pump. Background Art

[0002] The canned motor pump can be made vertical or horizontal. It consists of a canned motor, a centrifugal pump, a mechanical seal, a heat-insulating connector, a base, and other parts. When the canned motor stator is powered on, the rotor will rotate, and at the same time drive the coaxial impeller to rotate, doing work on the high-temperature corrosive medium entering the pump body 14, generating pressure to complete the liquid transportation. Figure 1 As shown, in order to prevent the high-temperature medium in the shielded pump from entering the motor and damaging the motor due to low-temperature solidification, and to prevent the high temperature of the medium from being transmitted to the motor, a sealing structure is designed between the shielded motor and the centrifugal pump to isolate the liquids on both sides. However, the high-temperature medium in the prior art is easily transported to the sealing structure 13 under the action of the impeller, resulting in the high-temperature medium contacting the sealing structure 13. After a long time, the sealing performance of the sealing structure 13 will be affected, resulting in the high-temperature medium passing through the sealing structure 13 and entering the motor, thereby damaging the motor. Summary of the invention

[0003] The object of the present invention is to provide an impeller structure of a shielded pump which can prevent a high-temperature medium from flowing into a sealing structure.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] An impeller structure of a canned pump comprises an impeller body and a drive shaft, wherein a flow channel is arranged in the impeller body, a hub is arranged at the rear end center position of the impeller body, a central axis hole for connecting with the drive shaft is arranged at the center position in the hub, a medium inlet is arranged at the front end of the impeller body, a medium outlet is arranged on the blades of the impeller body, the medium inlet is connected with the medium outlet through the flow channel, a plurality of annular protrusions are arranged on the outer periphery of the hub along the axial direction, an inclined surface is arranged on the upper part of the annular protrusion, and the angle between the inclined surface and the horizontal plane is 30° to 60°.

[0006] Furthermore, the angle between the inclined plane and the horizontal plane is 45°.

[0007] Furthermore, four annular protrusions are provided.

[0008] Furthermore, a sealing ring installation groove is provided at the lower end of the central axis hole, a sealing ring is provided in the sealing ring installation groove, and the impeller body is threadedly connected to the lower end of the driving shaft after a self-locking screw passes through the sealing ring.

[0009] Furthermore, a first keyway is provided at the lower portion of the drive shaft, a flat key is provided in the first keyway, and a second keyway for installing the flat key is provided on the inner wall of the hub.

[0010] The beneficial effects of the present invention are:

[0011] The present invention provides a plurality of annular protrusions along the axial direction on the outer periphery of the hub, and an inclined surface is provided on the upper part of the annular protrusion. When the driving shaft drives the impeller to rotate, the annular protrusion will also rotate with the impeller. In this way, when the high-temperature medium moves upward to the gap between the hub and the pump body, the annular protrusion will generate a centrifugal force downward along the inclined surface, thereby preventing the high-temperature medium from continuing to flow upward to the sealing structure, thereby preventing the high-temperature medium from leaking to the sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a cross-sectional view in the prior art;

[0013] Figure 2 It is a partial cross-sectional view of the present invention installed on a canned motor pump;

[0014] Figure 3 is a cross-sectional view of the present invention;

[0015] Figure 4 It is the front view of the present invention. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings:

[0017] like Figures 2 to 4 As shown, an impeller structure of a canned pump includes an impeller body 1 and a drive shaft 2, wherein a flow channel 3 is arranged in the impeller body 1, a hub 4 is arranged at the rear end center position of the impeller body 1, a central axis hole for connecting with the drive shaft 2 is arranged at the center position in the hub, a medium inlet 5 is arranged at the front end of the impeller body 1, a medium outlet 6 is arranged on the blades of the impeller body 1, the medium inlet 5 is connected with the medium outlet 6 through the flow channel 3, a plurality of annular protrusions 8 are arranged on the outer periphery of the hub 4 along the axial direction, an inclined surface 11 is arranged on the upper part of the annular protrusion 8, and an angle between the inclined surface 11 and the horizontal plane 12 is 30° to 60°.

[0018] The present invention provides a plurality of annular protrusions 8 along the axial direction on the outer periphery of the hub 4, and an inclined surface 11 is provided on the upper portion of the annular protrusion 8. When the driving shaft 2 drives the impeller to rotate, the annular protrusion 8 will also rotate with the impeller. In this way, when the high-temperature medium moves upward to the gap between the hub 4 and the pump body 14, the annular protrusion 8 will generate a centrifugal force downward along the inclined surface 11, thereby preventing the high-temperature medium from continuing to flow upward to the sealing structure 13, thereby preventing the high-temperature medium from leaking to the sealing structure 13.

[0019] In this embodiment, the angle between the inclined surface 11 and the horizontal surface 12 of the impeller is set to 30° to 60° to ensure that the centrifugal force generated by the annular protrusion 8 is large enough to ensure that the high-temperature medium cannot pass through the annular protrusion 8.

[0020] In this embodiment, the angle between the inclined surface 11 and the horizontal plane 12 is 45°. The angle of the inclined surface 11 in this embodiment is set to 45°, which is the best embodiment. When the angle between the inclined surface 11 and the horizontal plane 12 is 45°, the centrifugal force generated by the annular protrusion 8 is the largest, thereby effectively ensuring that the high-temperature medium cannot pass through the annular protrusion 8.

[0021] In this embodiment, there are four annular protrusions 8. By providing four annular protrusions 8, it can be ensured that the four annular protrusions 8 form four lines of defense. Even if the high-temperature medium passes through the first line of defense, the other lines of defense can still prevent the high-temperature medium from passing through.

[0022] In this embodiment, a sealing ring installation groove is further provided at the lower end of the central shaft hole, a sealing ring 9 is provided in the sealing ring installation groove, and the impeller body 1 is threadedly connected with the lower end of the driving shaft 2 after the self-locking screw 10 passes through the sealing ring 9. In this embodiment, by providing the self-locking screw 10, the screw can be prevented from falling off and entering the impeller, thereby increasing safety.

[0023] The outer surface of the self-locking screw 10 in this embodiment is electroplated with a zinc-aluminum alloy coating, which has the effects of high temperature resistance and corrosion resistance.

[0024] In this embodiment, a first keyway 15 is provided at the lower part of the drive shaft 2, a flat key 16 is provided in the first keyway 15, and a second keyway for installing the flat key is provided on the inner wall of the hub 4. In this embodiment, a flat key is added to the installation between the drive shaft and the impeller for fixing, which can prevent the impeller from falling off during high-speed operation.

[0025] The above description does not limit the technical scope of the present invention in any way. Any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An impeller structure of a canned motor pump, characterized in that: It comprises an impeller body and a driving shaft, wherein a flow channel is arranged in the impeller body, a hub is arranged at the rear end center position of the impeller body, a central axis hole for connecting with the driving shaft is arranged at the central position of the hub, a medium inlet is arranged at the front end of the impeller body, a medium outlet is arranged on the blades of the impeller body, the medium inlet is communicated with the medium outlet through the flow channel, a plurality of annular protrusions are arranged on the outer periphery of the hub along the axial direction, an inclined surface is arranged on the upper part of the annular protrusion, and the angle between the inclined surface and the horizontal plane is 45°; 4 annular protrusions are arranged; a sealing ring installation groove is also arranged at the lower end of the central axis hole, a sealing ring is arranged in the sealing ring installation groove, the impeller body is threadedly connected with the lower end of the driving shaft after a self-locking screw passes through the sealing ring; a first keyway is arranged at the lower part of the driving shaft, a flat key is arranged in the first keyway, and a second keyway for installing the flat key is arranged on the inner wall of the hub.

Images