Corrosion-resistant vertical coaxial centrifugal pump

Abstract

The utility model relates to the field of vertical centrifugal pumps, and discloses a corrosion-resistant vertical coaxial centrifugal pump which comprises a motor shaft and a pump shaft, the pump shaft comprises a coaxial section and a connecting section, the coaxial section is in a sleeve shape and is connected to the end of the motor shaft in a sleeved mode, an impeller is connected to the connecting section, a through hole is formed in the connecting section, and a locking piece is axially arranged at the end of the connecting section in a penetrating mode. And the locking piece is connected with the motor shaft and axially presses the impeller. Compared with a conventional vertical centrifugal pump, the vertical centrifugal pump has the advantages that the motor shaft is not affected by the types of pumped media and large potential difference existing in pump material selection, and the reliability of pump operation is guaranteed. Meanwhile, due to the structure that the pump shaft is sleeved on the motor shaft, the short shaft extension distance is guaranteed, and the operation reliability of a pump set is further guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of vertical centrifugal pumps, in particular to a corrosion-resistant vertical coaxial centrifugal pump. Background Art

[0002] Vertical centrifugal pumps generally use couplings to connect the motor shaft and pump shaft, or the motor shaft and pump shaft are coaxial. When the pumping medium is seawater, other corrosive media, or there is a tendency for electrochemical corrosion, the conventional coaxial form is that the impeller and the motor share a shaft. In the process of pumping corrosive media, such pumps are prone to corrosion and strength reduction due to the poor corrosion resistance of the motor shaft material, which makes it impossible to ensure the reliability of operation, and even break and become unusable. Utility Model Content

[0003] The utility model is intended to provide a corrosion-resistant vertical coaxial centrifugal pump to solve the problem in the prior art that the motor shaft and the pump shaft of the vertical centrifugal pump share a common shaft and it is difficult to ensure the operating reliability when pumping corrosive media.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a corrosion-resistant vertical coaxial centrifugal pump, comprising a motor shaft and a pump shaft, the pump shaft comprising a coaxial section and a connecting section, the coaxial section is sleeve-shaped and sleeved on the end of the motor shaft, an impeller is connected to the connecting section, a through hole is provided inside the connecting section, a locking piece is axially penetrated at the end of the connecting section, the locking piece is connected to the motor shaft and axially presses the impeller.

[0005] Preferably, as an improvement, the coaxial section and the motor shaft are key-connected.

[0006] Preferably, as an improvement, the connecting section and the impeller are key-connected.

[0007] Preferably, as an improvement, the locking member is a bolt with a hemispherical head, a threaded hole is provided at the end of the motor shaft, and a plurality of slots are provided at the head of the locking member.

[0008] Preferably, as an improvement, an annular sealing gasket is provided between the locking member head and the impeller.

[0009] Preferably, as an improvement, a sealing ring is provided between the locking member and the inner wall of the through hole.

[0010] Preferably, as an improvement, a shaft shoulder is provided between the coaxial section and the connecting section, and the impeller end face abuts against the shaft shoulder.

[0011] Preferably, as an improvement, a mechanical seal is provided between the coaxial section and the pump body of the centrifugal pump.

[0012] The principle and advantages of this scheme are: in actual application, in order to solve the problems of medium corrosion and electrochemical corrosion, the coaxial structure is still used, but the pump shaft sleeve is on the motor shaft, connected and fixed by locking bolts, and the connection is strengthened by key connection. Sealing pads and sealing rings are designed between the locking bolts and the impeller and pump shaft for annular sealing to prevent the pumped corrosive medium from corroding the motor shaft through the connection gap. The advantage over conventional vertical centrifugal pumps is that the motor shaft will not be affected by the large potential difference between the type of pumped medium and the material selection of the pump, ensuring the reliability of the pump operation. At the same time, the structure of the pump shaft sleeve on the motor shaft ensures a shorter shaft extension distance, and the reliability of the pump unit operation will be further guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a partial longitudinal sectional view of the pump body in the embodiment of the utility model. DETAILED DESCRIPTION

[0014] The following is further described in detail through specific implementation methods:

[0015] The figure marks in the drawings of the specification include: motor shaft 1, threaded hole 2, pump body 3, locking bolt 4, pump shaft 5, connecting section 51, coaxial section 52, impeller 6, sealing gasket 7, slot 8, O-ring 9, mechanical seal 10.

[0016] The embodiment is basically as shown in the attached Figure 1 As shown: A corrosion-resistant vertical coaxial centrifugal pump includes a pump body 3, a motor, a motor shaft 1 and a pump shaft 5. The motor shaft 1 extends into the pump body 3, and an axial threaded hole 2 is processed at the end of the motor shaft 1. The pump shaft 5 includes a coaxial section 52 and a connecting section 51. A shaft shoulder is provided between the coaxial section 52 and the connecting section 51. The coaxial section 52 is sleeved on the end of the motor shaft 1 in a sleeve shape. A mechanical seal 10 is provided between the coaxial section 52 and the pump body 3 of the centrifugal pump. The coaxial section 52 and the motor shaft 1 are keyed. An impeller 6 is keyed to the connecting section 51, and the end face of the impeller 6 abuts against the shaft shoulder. A through hole is provided inside the connecting section 51, and a locking bolt 4 is axially penetrated at the end of the connecting section 51. The head of the locking bolt 4 is hemispherical and has multiple slots 8 processed on the head. The locking bolt 4 is connected to the threaded hole 2 at the end of the motor shaft 1. After connection, the head of the locking bolt 4 presses the impeller 6 axially. Two annular sealing gaskets 7 are arranged side by side between the head of the locking bolt 4 and the end face of the impeller 6. A stepped hole is processed at the end of the through hole near the head of the locking bolt 4, and a step is arranged at the locking bolt 4 corresponding to the step hole, and an OO-type sealing ring 9 is arranged between the step and the inner wall of the step hole.

[0017] The specific implementation process is as follows: In actual application, in order to solve the problems of medium corrosion and electrochemical corrosion, the coaxial structure is still adopted. The pump shaft 5 is sleeved on the motor shaft 1, and the connection is strengthened and installed through a key connection, and the locking bolt 4 is used to connect and fix. The pump shaft 5 and the pump body 3 are sealed by a mechanical seal 10. The impeller 6 and the pump shaft 5 are guided and radially connected through a key connection, and the impeller 6 is axially fixed through a shaft shoulder and a locking bolt 4. A sealing gasket 7 and a sealing ring are designed between the locking bolt 4 and the impeller 6 and the pump shaft 5 for annular sealing to prevent the pumped corrosive medium from corroding the motor shaft 1 through the connection gap. The advantage over the conventional vertical centrifugal pump is that the motor shaft 1 will not be affected by the large potential difference between the type of pumped medium and the material selection of the pump, ensuring the reliability of the pump operation. At the same time, the structure of the pump shaft 5 sleeved on the motor shaft 1 ensures a shorter shaft extension distance, and the reliability of the pump group operation will be further guaranteed.

[0018] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A corrosion-resistant vertical coaxial centrifugal pump, comprising a motor shaft and a pump shaft, characterized in that: The pump shaft includes a coaxial section and a connecting section. The coaxial section is sleeve-shaped and sleeved on the end of the motor shaft. The connecting section is connected to an impeller. A through hole is provided inside the connecting section. A locking piece passing through the through hole is axially penetrated at the end of the connecting section. The locking piece is connected to the motor shaft and axially presses the impeller. A mechanical seal is provided between the coaxial section and the pump body of the centrifugal pump.

2. A corrosion-resistant vertical coaxial centrifugal pump according to claim 1, characterized in that: The coaxial section and the motor shaft are key-connected.

3. A corrosion-resistant vertical coaxial centrifugal pump according to claim 2, characterized in that: The connecting section and the impeller are key connected.

4. The corrosion-resistant vertical coaxial centrifugal pump according to claim 1, characterized in that: The locking piece is a bolt with a hemispherical head, a threaded hole is arranged at the end of the motor shaft, and a plurality of slots are arranged at the head of the locking piece.

5. The corrosion-resistant vertical coaxial centrifugal pump according to claim 4, characterized in that: An annular sealing gasket is arranged between the locking piece head and the impeller.

6. The corrosion-resistant vertical coaxial centrifugal pump according to claim 5, characterized in that: A sealing ring is arranged between the locking piece and the inner wall of the through hole.

7. The corrosion-resistant vertical coaxial centrifugal pump according to claim 1, characterized in that: A shaft shoulder is arranged between the coaxial section and the connecting section, and the end face of the impeller abuts against the shaft shoulder.

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