Anti-reverse centrifugal pump and conveying system

Abstract

The utility model belongs to the technical field of centrifugal pumps, and particularly provides an anti-reverse centrifugal pump which comprises a pump body, a pump shaft and a bearing support, and one end of the pump shaft extends out of a bearing cavity and is rotationally connected with a coupler. A first one-way bearing is arranged in the bearing support and can limit reverse rotation of the pump shaft. A second one-way bearing is arranged in the coupling, so that the coupling can only drive the pump shaft to rotate forwards; when the rotation direction of the coupler is opposite to the forward rotation direction of the pump shaft, the coupler and the second one-way bearing idle.

Description

Technical Field

[0001] This utility model belongs to the field of centrifugal pump technology, specifically providing an anti-reverse centrifugal pump and conveying system. Background Technology

[0002] A centrifugal pump generally consists of a pump body, a pump shaft, and a bearing support. The pump shaft is supported by bearings within the bearing support, and an impeller is installed on the portion of the pump shaft within the pump chamber. As the pump shaft drives the impeller to rotate forward, the impeller draws in fluid through the inlet and discharges the fluid under pressure through the outlet of the pump body.

[0003] The above-mentioned centrifugal pump will have the following two problems when in use: (1) When the centrifugal pump stops, the liquid in the pipeline is likely to flow back to the pump chamber through the outlet of the pump body. The liquid flowing back to the pump chamber will impact the impeller and cause it to reverse. Especially when the outlet of the centrifugal pump is facing upward, the impeller will be subjected to greater reverse impact. (2) The pump shaft of the centrifugal pump is generally coaxially fixed with the drive shaft of the motor through a coupling. When the motor wiring is incorrect, the motor will drive the coupling, pump shaft and impeller to reverse at high speed.

[0004] However, when the pump shaft and impeller reverse due to the above two reasons, it is easy to cause wear on the connection structure between the pump shaft and impeller, which in turn affects the service life of the centrifugal pump. Utility Model Content

[0005] The purpose of this invention is to provide a centrifugal pump that prevents reverse rotation, thereby solving at least one of the aforementioned technical problems.

[0006] To address the aforementioned problems in the prior art, one or more embodiments of this utility model provide an anti-reverse centrifugal pump, comprising a pump body, a pump shaft, and a bearing support. A pump chamber is formed within the pump body, and a bearing chamber is formed within the bearing support. The pump shaft passes through both the pump chamber and the bearing chamber, with one end extending out of the bearing chamber and rotatably connected to a coupling. The pump shaft can rotate forward to allow the centrifugal pump to transport liquid. A first one-way bearing is provided within the bearing support, capable of locking the pump shaft in one direction to restrict reverse rotation. A second one-way bearing is provided within the coupling, capable of locking both the pump shaft and the coupling in one direction, ensuring that the coupling can only drive the pump shaft to rotate forward. When the rotation direction of the coupling is opposite to the forward rotation direction of the pump shaft, the coupling and the second one-way bearing rotate freely relative to the pump shaft.

[0007] One or more embodiments of this utility model also provide a conveying system, including the above-mentioned anti-reverse centrifugal pump, and further including an inlet pipe and an outlet pipe, the inlet pipe being connected to the water inlet of the pump body, the outlet pipe being connected to the water outlet of the pump body, and the coupling being coaxially fixed with the drive shaft of the motor.

[0008] The beneficial effects of one or more of the above technical solutions:

[0009] This solution utilizes a first one-way bearing and a second one-way bearing to avoid impeller and pump shaft reversal caused by liquid backflow and reversed motor wiring, thus preventing problems such as loosening of internal connecting parts, abnormal noise, and even wear of the centrifugal pump caused by pump shaft reversal. Attached Figure Description

[0010] The following description refers to the accompanying drawings, in which:

[0011] Figure 1 This is a schematic diagram of the overall assembly structure of the centrifugal pump in this embodiment of the present invention;

[0012] Figure 2 This is a partial structural assembly diagram of the pump shaft, the first one-way bearing, and the second one-way bearing according to an embodiment of this utility model.

[0013] List of reference numerals in the attached drawings: 1. Impeller; 2. Screw; 3. Inlet; 4. Pump body; 5. Outlet; 6. Pump shaft; 7. Rear bearing; 8. Bearing bracket; 81. Gland; 9. Coupling; 10. Second one-way bearing; 11. First one-way bearing; 12. Bearing chamber; 13. Spacer; 14. Nut. Detailed Implementation

[0014] Those skilled in the art should understand that the embodiments described below are merely preferred embodiments of this application, and these preferred embodiments are only used to explain the technical principles of this application and are not intended to limit the scope of protection of this application.

[0015] It should be noted that in the description of this application, terms such as "center," "upper," "lower," "top," "bottom," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0016] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can also refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0017] In this application, the forward rotation direction of the pump shaft and impeller is defined as the direction in which the impeller can pressurize and transport liquid, and the direction opposite to the forward rotation direction is the reverse rotation direction. The one-way bearing itself is an existing structure, and its detailed structure will not be described in this embodiment. The front and rear bearings in this application are distinguished by their distance from the impeller; the one closer to the impeller is the front bearing, and the one farther from the impeller is the rear bearing. Here, "front and rear" does not mean that the front and rear bearings have the same or different structures.

[0018] like Figures 1-2 As shown, this embodiment provides an anti-reverse centrifugal pump, including a pump body 4, a pump shaft 6, and a bearing bracket. A pump chamber is formed within the pump body 4, and a bearing chamber 12 is formed within the bearing bracket. The pump shaft 6 passes through the pump chamber and the bearing chamber 12, with one end extending out of the bearing chamber 12 and rotatably connected to a coupling 9. The pump shaft 6 can rotate forward to allow the centrifugal pump to transport liquid. A first one-way bearing 11 is provided within the bearing bracket, which can unidirectionally lock the pump shaft 6 to restrict reverse rotation. A second one-way bearing 10 is provided within the coupling 9, which can unidirectionally lock the pump shaft 6 and the coupling 9, so that the coupling 9 can only drive the pump shaft 6 to rotate forward. When the rotation direction of the coupling 9 is opposite to the forward rotation direction of the pump shaft 6, the coupling 9 and the second one-way bearing 10 rotate freely relative to the pump shaft 6.

[0019] Specifically, the first one-way bearing 11 and the second one-way bearing 10 are sleeved on the outside of the pump shaft 6. The first one-way bearing 11 is located between the outer circular surface of the pump shaft 6 and the inner wall surface of the bearing bracket 8. The second one-way bearing 10 is located between the outer circular surface of the pump shaft 6 and the inner wall surface of the coupling 9.

[0020] Specifically, the pump body 4 has an inlet 3 and an outlet 5 that connect to the pump chamber. The inlet 3 is used to introduce liquid into the pump chamber, and the outlet 5 is used to discharge pressurized liquid from the pump chamber. See also... Figure 1 The inlet 3 is located at one end of the pump body 4 along the axis of the pump shaft 6, and the liquid inlet direction of the inlet 3 is parallel to the axial direction of the pump shaft 6. The outlet 5 faces the outer periphery of the blades, and the liquid outlet direction of the outlet 5 is perpendicular to the axial direction of the pump shaft 6.

[0021] See Figure 1 In this embodiment, one end of the pump shaft 6, located inside the pump chamber, is fixedly connected to the impeller 1 by screws, and the other end is connected to the coupling 9. In this embodiment, the bearing chamber 12 is equipped with a front bearing and a rear bearing 7 sleeved on the outside of the pump shaft 6 to support the pump shaft 6 during rotation. Specifically, the bearing bracket 8 includes a body and a cover 81. The front bearing and the rear bearing 7 are installed in the body, and the first one-way bearing is installed inside the cover 81. The cover 81 and the body are detachably fixed by threaded connections.

[0022] In this embodiment, the first one-way bearing 11 and / or the second one-way bearing 10 are used in pairs. The pump body 4 and the bearing bracket 8 are detachably fixed. See also Figure 2 Two first one-way bearings 11 are paired and housed in the bearing bracket 8, and two second one-way bearings 10 are paired and housed in the coupling 9. Specifically, the bearing bracket 8 is detachably fixed to the pump body 4 by screws.

[0023] In this embodiment, a spacer 13 is also included. The spacer 13 is sleeved on the outer ring surface of the pump shaft 6, and the two ends of the spacer 13 along the axial direction abut against the end faces of the first one-way bearing 11 and the second one-way bearing 10, respectively.

[0024] In this embodiment, the coupling 9 has an installation cavity at one end facing the pump body 4. The installation cavity is fitted with a second one-way bearing 10. An end cover is detachably fixed at the port of the installation cavity. The end cover is rotatably installed on the outer ring surface of the spacer 13.

[0025] In this embodiment, a limiting nut 14 is installed at one end of the pump shaft 6 located outside the pump chamber, and the nut 14 abuts against the end of the second bearing away from the pump body 4. In this embodiment, the end of the first one-way bearing 11 facing the pump chamber abuts against the shoulder of the pump shaft 6.

[0026] This embodiment also provides a conveying system, including the above-mentioned anti-reverse centrifugal pump, and further including an inlet pipe and an outlet pipe. The inlet pipe is connected to the water inlet 3 of the pump body 4, and the outlet pipe is connected to the water outlet 5 of the pump body 4. The coupling 9 is coaxially fixed with the drive shaft of the motor.

[0027] Working principle: When the water flow reverses and causes the pump shaft 6 and impeller 1 in the centrifugal pump to be passively reversed, the first one-way bearing 11 will lock the entire rotor assembly formed by the pump shaft 6 and impeller 1 to prevent the centrifugal pump from being passively reversed.

[0028] When the motor rotates in the same direction as the centrifugal pump (i.e., when the motor drives the centrifugal pump to rotate forward), the second one-way bearing 10 locks, and the motor's power is transmitted to the impeller 1 through the coupling 9, the second one-way bearing 10, and the pump shaft 6, enabling the centrifugal pump to operate normally. When the motor rotates in the opposite direction to the centrifugal pump (i.e., when the motor drives the centrifugal pump to rotate in reverse), the power is transmitted to the second one-way bearing 10 through the coupling 9. The second one-way bearing 10 cannot lock and rotates freely, preventing the power from being transmitted to the pump shaft 6, thus preventing the pump shaft 6, impeller 1, and other components from rotating in reverse.

[0029] The technical solutions of this application have been described in conjunction with the preferred embodiments above. However, it will be readily understood by those skilled in the art that the scope of protection of this application is not limited to the above preferred embodiments. Without departing from the technical principles of this application, those skilled in the art can disassemble and combine the technical solutions in the above preferred embodiments, and can also make equivalent changes or substitutions to the relevant technical features. Any changes, equivalent substitutions, improvements, etc., made within the technical concept and / or technical principles of this application will fall within the scope of protection of this application.

Claims

1. A centrifugal pump with anti-reverse rotation, comprising a pump body, a pump shaft, and a bearing support, wherein a pump chamber is formed within the pump body, a bearing chamber is formed within the bearing support, the pump shaft passes through the pump chamber and the bearing chamber, one end of the pump shaft extends out of the bearing chamber and is rotatably connected to a coupling, and the pump shaft is capable of forward rotation to enable the centrifugal pump to transport liquid, characterized in that: The bearing bracket is equipped with a first one-way bearing, which can lock the pump shaft in one direction to limit the pump shaft from rotating in reverse; the coupling is equipped with a second one-way bearing, which can lock the pump shaft and the coupling in one direction, so that the coupling can only drive the pump shaft to rotate forward; when the rotation direction of the coupling is opposite to the forward rotation direction of the pump shaft, the coupling and the second one-way bearing rotate freely relative to the pump shaft.

2. The anti-reverse centrifugal pump according to claim 1, characterized in that, The bearing chamber is equipped with a front bearing and a rear bearing that are sleeved on the outside of the pump shaft to provide support when the pump shaft rotates.

3. The anti-reverse centrifugal pump according to claim 1, characterized in that, The pump body has an inlet and an outlet on its side wall, and the pump chamber has an impeller fixed to the pump shaft.

4. The anti-reverse centrifugal pump according to claim 1, characterized in that, The first one-way bearing and / or the second one-way bearing are used in pairs.

5. The anti-reverse centrifugal pump according to claim 1, characterized in that, The pump body and bearing bracket are detachable and can be fixed.

6. A conveying system, characterized in that, The centrifugal pump including any one of claims 1-5 further includes an inlet pipe and an outlet pipe, wherein the inlet pipe is connected to the water inlet of the pump body, the outlet pipe is connected to the water outlet of the pump body, and the coupling is coaxially fixed with the drive shaft of the motor.

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