Main shaft protection structure of special-purpose direct-connection centrifugal pump

Abstract

The invention relates to the technical field of centrifugal pump protection, in particular to a special-purpose direct-connection centrifugal pump main shaft protection structure which comprises a pump body, an impeller is arranged in the pump body, and a hub used for connection is fixedly installed on the side face of the impeller. A mounting cavity is formed in the output end of the motor, a motor shaft is fixedly mounted in the mounting cavity, and the end of the motor shaft is connected with the hub in an inserted mode; the sealing assembly is arranged at the joint of the motor shaft and the hub, and the sealing assembly can seal the end part of the motor shaft; the water retaining piece is detachably mounted on the outer side of the end part of the hub; the possibility that a medium makes contact with the motor shaft can be reduced, and then the possibility that the surface of the motor shaft rusts to affect later maintenance and disassembly is reduced.

Description

Technical Field

[0001] This invention relates to the field of centrifugal pump protection technology, specifically to a special-purpose direct-drive centrifugal pump spindle protection structure. Background Technology

[0002] Centrifugal pumps transport liquids using the centrifugal force generated by the rotation of the impeller. During operation, the high-speed rotation of the impeller drives the liquid to rotate, forcing it into the pump body at high speed. Ultimately, the liquid is delivered to the pump outlet at a higher pressure. Conventional direct-drive centrifugal pumps, because the motor is coaxial with the pump, require consideration of the motor's magnetic properties while meeting the pump unit's operational requirements. Therefore, ferrite-containing carbon steel is necessary to meet the motor's performance needs.

[0003] However, carbon steel is prone to rust when pumping media. Long-term use of rust not only affects the strength of the shaft itself, but also makes later maintenance and disassembly difficult, resulting in complicated replacement of the motor shaft. Summary of the Invention

[0004] To address the aforementioned shortcomings in the existing technology, this invention provides a special-purpose direct-drive centrifugal pump main shaft protection structure, which solves the problem that the existing centrifugal pump main shaft is made of carbon steel, which is prone to rust when in contact with the pumped medium. Long-term use of rust not only affects the strength of the shaft itself, but also makes subsequent maintenance and disassembly difficult, leading to complicated motor shaft replacement.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A special-purpose direct-drive centrifugal pump main shaft protection structure includes a pump body, an impeller disposed within the pump body, and a hub for connection fixedly mounted on the side of the impeller; a motor, the output end of which has a mounting cavity, and a motor shaft fixedly mounted within the mounting cavity, the end of which is inserted into the hub; a sealing assembly disposed at the connection between the motor shaft and the hub, the sealing assembly being capable of sealing the end of the motor shaft; and a water baffle detachably mounted on the outer side of the hub end.

[0006] In this way, after the motor is connected to the pump body, the medium flows through the pump body inlet to the connection between the motor shaft and the hub. The sealing component is set at the connection between the motor shaft and the hub to seal the end of the motor shaft and prevent the medium from contacting the motor shaft. The water baffle is detachably installed on the outside of the hub end to prevent the medium flowing into the installation cavity from contacting the motor shaft. With this structure, the possibility of the medium contacting the motor shaft can be reduced, thereby reducing the possibility of rust on the surface of the motor shaft affecting the later maintenance and disassembly.

[0007] Furthermore, the sealing assembly includes an inner nut disposed at the connection between the motor shaft and the hub. A conical outer nut is engaged with the surface of the inner nut. The outer surface of the inner nut is a smooth surface, and the inner surface of the outer nut is a textured surface. Thus, the outer nut and the inner nut cooperate to lock and seal the end of the motor shaft, reducing the possibility of the medium contacting the motor shaft.

[0008] Furthermore, the outer surface of the inner nut and the inner surface of the outer nut have different tapers, and a gap is reserved at the connection between the inner nut and the outer nut for rework.

[0009] In this way, the inner nut has a larger taper angle and the outer nut has a smaller taper angle. When the inner and outer nuts come into contact, they will form a sealing narrow band with extremely high specific pressure. This will lock and seal the end of the motor shaft. Because the inner and outer nuts have different tapers, a certain gap will be reserved at the connection. When the outer nut is disassembled and reassembled, the outer nut is aligned with the inner nut and squeezed and clamped. This structure can extend the service life of the inner and outer nuts.

[0010] Furthermore, the inner nut has a groove on the outer side of one end of the connection between the motor shaft and the hub, and a sealing ring is provided in the groove, thereby improving the sealing performance of the connection between the inner nut and the hub.

[0011] Furthermore, a mechanical seal is provided in the mounting cavity, and the hub extends along the motor shaft to the side of the mechanical seal away from the impeller. The mechanical seal is installed on the outer surface of the hub, thereby preventing the medium from entering from the connection between the hub and the motor shaft and reducing the possibility of the medium contacting the motor shaft.

[0012] Furthermore, the water-blocking component includes a water-blocking ring that is detachably installed on the end face of the hub. The water-blocking ring is generally annular, so that the water-blocking ring is subjected to uniform force, which can reduce the possibility of the medium flowing into the mounting cavity contacting the motor shaft after the mechanical seal fails.

[0013] Furthermore, slots are evenly distributed on the surface of the wheel hub, and protrusions are evenly fixedly installed on the inner edge of the water-blocking ring. The protrusions can be inserted into the slots, thereby allowing the water-blocking ring to be detachably installed on the end of the wheel hub, facilitating the replacement of the water-blocking ring.

[0014] Furthermore, a liquid collection tank is provided below the mechanical seal, which can collect the medium flowing into the mounting cavity and reduce the possibility of the medium coming into contact with the motor shaft. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of an embodiment of a special-purpose direct-drive centrifugal pump spindle protection structure according to the present invention; Figure 2This is a cross-sectional view of the connection between the motor shaft and the hub in an embodiment of a special-purpose direct-drive centrifugal pump main shaft protection structure of the present invention; Figure 3 This is a cross-sectional view of the inner and outer nuts in an embodiment of a special-purpose direct-drive centrifugal pump spindle protection structure according to the present invention. Figure 4 This is a right-side view of the water baffle ring in an embodiment of a special-purpose direct-drive centrifugal pump spindle protection structure according to the present invention. Figure 5 This is a right-side view of the hub in an embodiment of a special-purpose direct-drive centrifugal pump main shaft protection structure of the present invention; Reference numerals in the accompanying drawings: Pump body 1, impeller 101, hub 102, slot 103; Motor 2, mounting cavity 201, motor shaft 202, mechanical seal 203, liquid collection tank 204; Sealing assembly 3, inner nut 301, outer nut 302, groove 303, sealing ring 304; Water-blocking component 4, water-blocking ring 401, protrusion 402. Detailed Implementation

[0016] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0018] Example: like Figures 1-5 As shown, a special purpose direct-drive centrifugal pump main shaft protection structure of the present invention includes a pump body 1 and a motor 2. An impeller 101 is provided inside the pump body 1, and a hub 102 for connection is fixedly installed on the side of the impeller 101. An installation cavity 201 is provided at the output end of the motor 2, and a motor shaft 202 is fixedly installed inside the installation cavity 201. The end of the motor shaft 202 is inserted into the hub 102. A sealing component 3 is provided at the connection between the motor shaft 202 and the hub 102. A water baffle 4 is detachably installed on the outer side of the end of the hub 102.

[0019] The sealing assembly 3 includes an inner nut 301 located at the connection between the motor shaft 202 and the hub 102. A conical outer nut 302 is snapped onto the surface of the inner nut 301. The outer surface of the inner nut 301 is a smooth surface, and the inner surface of the outer nut 302 is a textured surface. A groove 303 is opened on the outer side of one end of the inner nut 301 located at the connection between the motor shaft 202 and the hub 102. A sealing ring 304 is provided in the groove 303.

[0020] The outer surface of the inner nut 301 has a different taper than the inner surface of the outer nut 302. A gap is reserved at the connection between the inner nut 301 and the outer nut 302 for rework. Specifically, the inner nut 301 uses a larger taper angle, while the outer nut 302 uses a smaller taper angle. The taper difference between the outer surface of the inner nut 301 and the inner surface of the outer nut 302 is 5-10°. After the inner nut 301 and the outer nut 302 come into contact, they will form a sealing narrow band with extremely high specific pressure. This band, in conjunction with locking and sealing the end of the motor shaft 202, will leave a certain gap at the connection after the inner nut 301 and the outer nut 302 are connected. When the outer nut 302 is disassembled and reassembled, it can be aligned with the inner nut 301 and squeezed and clamped. Under the premise that the hardness of the inner nut 301 is not affected, the inner nut 301 and the outer nut 302 can continue to be used, thus extending the service life of the sealing assembly 3.

[0021] A mechanical seal 203 is provided in the mounting cavity 201. The hub 102 extends along the motor shaft 202 to the side of the mechanical seal 203 away from the impeller 101. The mechanical seal 203 is installed on the outer surface of the hub 102. A liquid collection groove 204 is provided below the mechanical seal 203. Specifically, after the hub 102 extends along the motor shaft 202, it can prevent the medium from entering from the connection between the hub 102 and the motor shaft 202 before the hub 102 extends, reducing the possibility of the medium contacting the motor shaft 202. The mechanical seal 203 further blocks the medium. After the mechanical seal 203 fails due to accidental damage, the water-blocking component 4 can prevent the medium from contacting the motor shaft 202. The blocked medium flows down along the inner wall of the mounting cavity 201 and enters the liquid collection tank 204.

[0022] The water-blocking component 4 includes a water-blocking ring 401 that is detachably installed on the end face of the wheel hub 102. The water-blocking ring 401 is generally annular. The surface of the wheel hub 102 has slots 103 evenly distributed. The inner edge of the water-blocking ring 401 has protrusions 402 that are evenly fixedly installed. The protrusions 402 can be inserted into the slots 103. Specifically, the slots 103 are concave grooves. After aligning the protrusions 402 on the inner edge of the water-blocking ring 401 with the slots 103, the water-blocking ring 401 is fitted onto the outside of the wheel hub 102. After rotating the water-blocking ring 401, the water-blocking ring 401 is pushed to move, and the water-blocking ring 401 is engaged with the wheel hub 102.

[0023] The above are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, and are capable of using conventional experimental methods prior to that date. They can improve and implement the present invention based on the guidance provided in this application and their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention. These modifications and improvements should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the invention or the practicality of the patent.

Claims

1. A special-purpose direct-drive centrifugal pump spindle protection structure, characterized in that, include: Pump body (1), an impeller (101) is provided inside the pump body (1), and a hub (102) for connection is fixedly installed on the side of the impeller (101). The motor (2) has an output end with a mounting cavity (201) and a motor shaft (202) is fixedly installed in the mounting cavity (201). The end of the motor shaft (202) is inserted into the hub (102). A sealing assembly (3) is disposed at the connection between the motor shaft (202) and the hub (102), and the sealing assembly (3) is capable of sealing the end of the motor shaft (202); Water-blocking component (4) is detachably installed on the outer side of the end of the hub (102).

2. The special-purpose direct-drive centrifugal pump spindle protection structure as described in claim 1, characterized in that: The sealing assembly (3) includes an inner nut (301) disposed at the connection between the motor shaft (202) and the hub (102). A conical outer nut (302) is snapped onto the surface of the inner nut (301). The outer surface of the inner nut (301) is a smooth surface, and the inner surface of the outer nut (302) is a patterned surface.

3. The special-purpose direct-drive centrifugal pump spindle protection structure as described in claim 2, characterized in that: The outer surface of the inner nut (301) has a different taper than the inner surface of the outer nut (302), and a gap is reserved at the connection between the inner nut (301) and the outer nut (302) for rework.

4. The special-purpose direct-drive centrifugal pump spindle protection structure as described in claim 3, characterized in that: The inner nut (301) is located at the end of the motor shaft (202) and the hub (102) with a groove (303) on the outside. A sealing ring (304) is provided in the groove (303).

5. The special-purpose direct-drive centrifugal pump spindle protection structure as described in claim 1, characterized in that: A mechanical seal (203) is provided in the mounting cavity (201). The hub (102) extends along the motor shaft (202) to the side of the mechanical seal (203) away from the impeller (101). The mechanical seal (203) is installed on the outer surface of the hub (102).

6. The special-purpose direct-drive centrifugal pump spindle protection structure as described in claim 5, characterized in that: The water-blocking component (4) includes a water-blocking ring (401) that is detachably installed on the end face of the hub (102), and the water-blocking ring (401) is generally annular.

7. A special-purpose direct-drive centrifugal pump spindle protection structure as described in claim 6, characterized in that: The surface of the hub (102) has slots (103) evenly distributed, and the inner edge of the water baffle (401) has protrusions (402) evenly fixedly installed, and the protrusions (402) can be inserted into the slots (103).

8. A special-purpose direct-drive centrifugal pump spindle protection structure as described in claim 5, characterized in that: A liquid collection tank (204) is provided below the mechanical seal (203).

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