A two end supported centrifugal pump easy to hand priming

Abstract

The utility model relates to an easy to manual turning of two end support formula centrifugal pump, including pump body and pump shaft. Among them, the pump shaft rotation sets up on the pump body, rotates around its own axis. The both ends of pump shaft are drive end and non - drive end respectively. The pump body is provided with first support part and second support part respectively on the both sides of pump shaft axial. Drive end passes through first support part. Non - drive end passes through second support part. Pump shaft divides into body section and extension section, and body section and extension section are coaxial and fixedly connected. Drive end is located in body section, and non - drive end is located in extension section. The part of extension section that passes out second support part is opened with prying hole along the radial of pump shaft, and prying hole can supply prying tool to insert. The utility model discloses through the extension of existing pump shaft, and the prying hole is opened on the extension section of pump shaft, so that the staff can pry directly to pump shaft to turn the rotor, avoids the damage of shaft coupling, and can avoid the invalid turning caused by the angle of pump shaft not changing before and after turning.

Description

Technical Field

[0001] This utility model relates to the technical field of centrifugal pumps, and in particular to a two-end supported centrifugal pump that is easy to manually rotate. Background Technology

[0002] The problem of inconvenient rotation of a two-end-supported centrifugal pump when it is stopped. The rotor of a two-end-supported centrifugal pump is typically supported by bearings at both ends. Except for the packing or mechanical seal at the shaft seal, the middle part is suspended. Therefore, when the pump is not started for a long time, the rotor's own weight will cause it to bend axially under gravity, leading to a significant increase in rotor imbalance. This can ultimately result in shaft breakage or bearing damage when the pump is started. Therefore, it is necessary to periodically rotate the pump to change the rotor's orientation and prevent it from bending continuously in one direction.

[0003] In the existing technology, there are two methods for rotating the pump when it is a large-volume centrifugal pump with two-end supports:

[0004] 1. Remove one pin from the pin of the pin coupling or one bolt from the bolt of the diaphragm coupling, then insert a pry bar into the hole and pry it open. Since couplings are usually made of cast iron, which is relatively brittle, the prying force is amplified through the lever principle. Although the rotor can be pried open, the coupling may be damaged. Furthermore, couplings are precision-installed parts, and such prying will affect their rotational stability.

[0005] 2. Briefly start the motor to drive the rotor. Before turning the pump, ensure that the pump is full of water or that there is external cooling water connected to the shaft seal. Otherwise, the packing or mechanical seal at the shaft seal will dry-rub and easily burn out. Moreover, the rotor position cannot be controlled after the motor stops, and the rotor may return to the same position as before turning, making the turning ineffective. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a centrifugal pump with two-end support that is easy to manually rotate.

[0007] The technical solution provided by this utility model is as follows:

[0008] A centrifugal pump with two-end support that is easy to manually rotate includes a pump body and a pump shaft; wherein, the pump shaft is rotatably mounted on the pump body and rotates about its own axis; the two ends of the pump shaft are respectively a driving end and a non-driving end; the pump body is provided with a first support and a second support on both sides of the pump shaft along its axial direction; the driving end passes through the first support; the non-driving end passes through the second support; the pump shaft is divided into a main body section and an extension section, the main body section and the extension section are coaxial and fixedly connected; the driving end is located in the main body section, and the non-driving end is located in the extension section; the portion of the extension section that extends out of the second support section has a pry hole along the radial direction of the pump shaft, the pry hole allowing a prying tool to be inserted.

[0009] Optionally, the pry hole is a circular through hole.

[0010] Optionally, the diameter of the pry hole is less than 40% of the pump shaft diameter.

[0011] Optionally, a skeleton seal is provided between the extension section and the second support portion; the skeleton seal closes the gap between the extension section and the second support portion.

[0012] Optionally, a protective cover is also included; the protective cover is detachably fastened to the side of the second support portion opposite to the first support portion and accommodates the non-driving end therein.

[0013] Optionally, a sealing gasket is provided between the protective cover and the second support portion; the sealing gasket seals the gap between the protective cover and the second support portion.

[0014] Optionally, the sealing gasket may comprise a kraft paper sheet.

[0015] As described above, the easily manually operated, two-end supported centrifugal pump of this invention has at least the following beneficial effects:

[0016] This utility model discloses a two-end supported centrifugal pump that is easy to manually rotate. By extending the existing pump shaft and creating pry holes in the extended section, operators can directly pry the pump shaft to rotate the rotor without disassembling the pins of the pin coupling or the bolts of the diaphragm coupling, thus avoiding damage to the couplings. Furthermore, the change in the orientation of the pry hole openings before and after rotation indicates whether the pump shaft angle has changed, preventing ineffective rotation due to a unchanged pump shaft angle. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an existing centrifugal pump with two supports.

[0018] Figure 2This is a schematic diagram of the dual-end supported centrifugal pump of this utility model, which is easy to manually rotate.

[0019] Figure 3 It is a schematic diagram of the specific structure of the pry hole, skeleton seal, protective cover, and sealing gasket.

[0020] Reference numerals: 1. Pump body; 2. Pump shaft; 21. Drive end; 22. Non-drive end; 23. Main body section; 24. Extension section; 3. First support part; 4. Second support part; 5. Pry hole; 6. Skeleton seal; 7. Protective cover; 71. Folded edge; 8. Sealing gasket; 9. Bearing rear cover. Detailed Implementation

[0021] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of this utility model is for describing specific implementation schemes and not for limiting the scope of protection of this utility model. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0022] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of implementation of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.

[0023] Figure 1The structure of an existing two-end supported centrifugal pump is shown, comprising a pump body 1 and a pump shaft 2. The pump shaft 2 is rotatably mounted on the pump body 1 and rotates along its own axis. One end of the pump shaft 2 is used to connect to a drive component and is referred to as the drive end 21, while the other end is referred to as the non-drive end 22. The pump body 1 forms a first support portion 3 and a second support portion 4 on both axial sides of the pump shaft 2. The drive end 21 of the pump shaft 2 passes through the first support portion 3 and is supported by it, while the non-drive end 22 passes through the second support portion 4 and is supported by it. Both the first support portion 3 and the second support portion 4 are equipped with bearing housings to support the rotation of the pump shaft 2.

[0024] Please refer to Figure 2 , Figure 3 Based on existing two-end supported centrifugal pumps, this invention proposes a two-end supported centrifugal pump that is easy to manually rotate, comprising a pump body 1 and a pump shaft 2. The pump shaft 2 is rotatably mounted on the pump body 1 and rotates around its own axis. The two ends of the pump shaft 2 are a driving end 21 and a non-driving end 22, respectively. The pump body 1 has a first support portion 3 and a second support portion 4 on both sides of the pump shaft 2 along its axial direction. The driving end 21 passes through the first support portion 3. The non-driving end 22 passes through the second support portion 4. The pump shaft 2 is divided into a main body section 23 and an extension section 24, which are coaxial and fixedly connected. The driving end 21 is located in the main body section 23, and the non-driving end 22 is located in the extension section 24. The portion of the extension section 24 that extends out of the second support portion 4 has a pry hole 5 along the radial direction of the pump shaft 2, allowing a prying tool to be inserted.

[0025] The main body section 23 and the extension section 24 of the pump shaft 2 can be integrally formed, that is, when manufacturing the pump shaft 2, the length of the pump shaft 2 is extended based on the existing pump shaft 2. Alternatively, the main body section 23 and the extension section 24 can be welded together, that is, the existing pump shaft 2 is used as the main body section 23, and the extension section 24 is welded to the main body section 23, which can also extend the length of the pump shaft 2.

[0026] The shape of the pry hole 5 can be circular, square, or other shapes, and can be a blind hole or a through hole. The shape and type of the pry hole 5 can be adapted to the different prying tools used to pry the pump shaft 2. In a preferred embodiment of this invention, the pry hole 5 is a circular through hole, and the axis of the pry hole 5 is in the same plane as the axis of the pump shaft 2 and perpendicular to each other. This is more conducive to applying force evenly to the pump shaft 2 and avoiding damage to the pump shaft 2. The prying tool can be a rigid metal rod.

[0027] On the other hand, if the diameter of the pry hole 5 is too large, it will easily reduce the strength of the pump shaft 2 and make the pump shaft 2 easily damaged when it is pried. Therefore, in a preferred embodiment of the present invention, the diameter of the pry hole 5 is less than 40% of the diameter of the pump shaft 2.

[0028] Please continue to refer to Figure 2 ,Figure 3 Since the non-drive end 22 of the pump shaft 2 needs to pass through the second support 4, a hole needs to be made in the bearing rear cover 9 of the existing second support 4 to allow the pump shaft 2 to pass through. After the hole is made, external liquids such as equipment leakage oil and rainwater may enter the bearing housing of the second support 4 through the gap between the hole and the pump shaft 2. Therefore, a skeleton seal 6 is provided between the extension section 24 and the second support 4. The skeleton seal 6 seals the gap between the extension section 24 and the second support 4.

[0029] Furthermore, the non-drive end 22 of the pump shaft 2, after passing through the second support portion 4, must not be exposed and needs to be protected to avoid damage caused by bumps or other impacts. In a preferred embodiment of this utility model, the two-end supported centrifugal pump, which is easy to manually rotate, also includes a protective cover 7. The protective cover 7 is detachably fastened to the side of the second support portion 4 opposite to the first support portion 3 and accommodates the non-drive end 22 within it.

[0030] The protective cover 7 is a hollow cylinder with an opening on one side along the axis. The opening side of the protective cover 7 is fastened to the side of the second support 4 opposite to the first support 3. The edge of the protective cover 7 extends outward to form a folded edge 71, and the folded edge 71 is fixed to the second support 4 by bolts.

[0031] To improve the sealing performance of the protective cover 7, a sealing gasket 8 is provided between the protective cover 7 and the second support part 4. The sealing gasket 8 seals the gap between the protective cover 7 and the second support part 4. Specifically, the gap between the protective cover 7 and the second support part 4 exists between the folded edge 71 and the second support part 4, therefore the sealing gasket 8 is annular, and is placed between this side and the second support part 4 when installing the protective cover 7. In a preferred embodiment of this utility model, the sealing gasket 8 is made of blue paper. The sealing gasket 8 can also be made of rubber gaskets or other suitable sealing components.

[0032] During rotation, remove the protective cover 7, insert a pry tool into the pry hole 5, and then rotate the pump shaft 2 to drive the rotor to rotate. Rotating 2-5 times completes the rotation. Before starting the pump, reinstall the protective cover 7.

[0033] This utility model discloses a two-end supported centrifugal pump that is easy to manually rotate. By extending the existing pump shaft 2 and opening pry holes 5 on the extended section 24 of the pump shaft 2, operators can directly pry the pump shaft 2 to rotate the rotor without having to disassemble the pins of the pin coupling or the bolts of the diaphragm coupling, thus avoiding damage to the couplings. At the same time, the change in the opening direction of the pry holes 5 before and after rotation can determine whether the angle of the pump shaft 2 has changed, thus avoiding ineffective rotation caused by the angle of the pump shaft 2 not changing before and after rotation.

[0034] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A two-end supported centrifugal pump that is easy to manually rotate, characterized in that, Includes pump body (1) and pump shaft (2); wherein, The pump shaft (2) is rotatably mounted on the pump body (1) and rotates around its own axis; the two ends of the pump shaft (2) are the driving end (21) and the non-driving end (22), respectively; The pump body (1) is provided with a first support part (3) and a second support part (4) on both sides of the pump shaft (2) in the axial direction; the driving end (21) passes through the first support part (3); the non-driving end (22) passes through the second support part (4); The pump shaft (2) is divided into a main body section (23) and an extension section (24), the main body section (23) and the extension section (24) are coaxial and fixedly connected; the driving end (21) is located in the main body section (23), and the non-driving end (22) is located in the extension section (24); The portion of the extension section (24) that extends out of the second support part (4) has a pry hole (5) along the radial direction of the pump shaft (2), and the pry hole (5) allows a prying tool to be inserted.

2. The easily manually operated, two-end supported centrifugal pump according to claim 1, characterized in that: The pry hole (5) is a circular through hole.

3. The easily manually operated, two-end supported centrifugal pump according to claim 2, characterized in that: The diameter of the pry hole (5) is less than 40% of the diameter of the pump shaft (2).

4. The easily manually operated, two-end supported centrifugal pump according to claim 1, characterized in that: A skeleton seal (6) is provided between the extension section (24) and the second support part (4); the skeleton seal (6) closes the gap between the extension section (24) and the second support part (4).

5. The easily manually operated, two-end supported centrifugal pump according to claim 1, characterized in that: It also includes a protective cover (7); The protective cover (7) is detachably fastened to the side of the second support (4) opposite to the first support (3) and accommodates the non-driving end (22).

6. The easily manually operated, two-end supported centrifugal pump according to claim 5, characterized in that: A sealing gasket (8) is provided between the protective cover (7) and the second support part (4); the sealing gasket (8) seals the gap between the protective cover (7) and the second support part (4).

7. The easily manually operated, two-end supported centrifugal pump according to claim 6, characterized in that: The sealing gasket (8) comprises blue shell paper.

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