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hunan neptune pump

How to solve the axial endplay of horizontal multistage cent

Source:未知|Popularity:0|release date:2020-03-21 15:11:32
Working principle of horizontal multistage centrifugal pump is as below:
The multistage centrifugal pump is to string two or more single-stage impellers with the same function on the same shaft, and then the fluid is forced out to the outlet of the pump through the flow passage, so as to obtain a higher outlet pressure head. Such a structure of series connection and superposition of energy forms a multistage centrifugal pump.

First of all, the multistage pump itself has (axial displacement is allowed, and the displacement is generally the size value given in the design.) When the horizontal multistage centrifugal pump starts, it is necessary to open the pump balance device (balance plate, balance ring and other main parts) to avoid the wear of balance plate and balance ring. Then when the pump runs smoothly, a dynamic balance (a fixed value) is achieved between the balance plate, balance ring and impeller. Because the actual operating conditions of each pump are changed according to the user's own conditions. However, when the small particles enter the middle of the seal ring and guide vane sleeve, the impeller of the pump will be subject to open wear. When the wear amount reaches a certain value, the gap between the impeller and the seal ring, between the impeller hub and the guide vane sleeve will increase, resulting in a large fluctuation of the pressure difference between the front and rear cover plates of the impeller. In this way, the rotor parts of the pump move back and forth in the axial direction. The larger the displacement is, the more serious the wear of the seal ring and guide vane sleeve is. The direct embodiment is that the pump starts to vibrate and the bearing heats up. But there is a point that all users need to understand: horizontal multistage centrifugal pump has axial displacement and the axial displacement is generally 3 ~ 6mm. Therefore, when the key parts of the pump start to heat, vibrate and make abnormal noise, the following methods can be used.
The general solution to these situations is as follows:
1. A filter is added at the inlet of the pump to block the large particle filtration at the other end of the inlet.
2. When the single axial movement is too large, it is recommended to replace the worn sealing parts.
3. It is suggested that the user should set up an on-line monitoring device to monitor the displacement of the pump in axial and horizontal directions.
4. It is suggested to break through the material and technology of wear-resistant parts to solve substantive problems.
5. In the design, it is considered to design an alarm device with wear to remind users at all times and monitor online at all times.