Cantilevered Centrifugal Pump Shaft Cooling Channel
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Solution Overview
Problem
Current methods for cooling or heating high-temperature centrifugal pumps are inadequate as they primarily focus on stationary components and only partially cool or heat the rotating parts, leading to inefficient temperature control and potential operational issues due to incomplete heat transfer and limited fluid flow.
Innovation Solution
A cooling or heating fluid circulation system for cantilevered centrifugal pumps that includes a heat exchange fluid channel system allowing the fluid to rotate with and flow along the axial direction of the pump shaft, utilizing a series of sealing glands and rings to create channels for efficient heat exchange, connected to an external heat exchanger for continuous temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling fluid is introduced into the pump chamber and bearing box for cooling stationary components, then the stationary components are cooled, but the rotating parts (pump shaft) cannot be directly cooled and the cooling effect is insufficient
Solution Approach 1:
The cooling system is segmented into separate cooling channels: one for stationary components (pump chamber, bearing box) and one for rotating parts (pump shaft). The pump shaft cooling channel is independently formed, allowing direct cooling of the rotating part without interfering with the stationary component cooling system.
Solution Approach 2:
A cooling fluid circulation system acts as an intermediary, introducing cooled fluid directly into the pump shaft through a dedicated channel. This mediator enables direct heat transfer from the cooling fluid to the rotating part, solving the problem of indirect and insufficient cooling.
2Device complexity
If cooling fluid contacts only the surface of rotating parts, then the fluid flow path is simple, but the axial length of fluid contacting the rotating parts is short and the convection effect is poor
Solution Approach 1:
The cooling channel is nested within the pump shaft structure itself, forming a hollow cylindrical passage inside the rotating part. This allows cooling fluid to flow axially through the entire length of the pump shaft, maximizing the contact area and convection effect without complicating the external structure.
Solution Approach 2:
The cooling fluid flow is transitioned from radial/surface contact to axial flow through the pump shaft. By introducing the cooling channel in the axial direction within the pump shaft, the fluid can flow along the entire axial length of the rotating part, significantly increasing the heat exchange area and convection effect.
3Device complexity
If cooling channels are formed only on the sealing gland, then the structure is simple, but the pump shaft cannot be cooled and the flow area is small
Solution Approach 1:
The cooling system is divided into separate functional zones: sealing gland cooling channels and pump shaft cooling channel. The pump shaft cooling channel is independently formed as a hollow cylindrical passage within the shaft itself, allowing direct cooling of the rotating part without affecting the sealing gland structure.
Solution Approach 2:
The cooling function is extracted from the sealing gland structure and transferred to the pump shaft structure itself. By forming the cooling channel directly within the pump shaft, the cooling capability is separated from the stationary components and applied directly to the rotating part that needs it most.
4Device complexity
If cooling fluid is used to cool the surface of rotating parts, then the method is simple, but the fluid cannot be axially displaced and the convection effect is poor
Solution Approach 1:
The cooling fluid flow is made dynamic by introducing axial flow through the pump shaft. The fluid enters one end of the pump shaft and flows axially along the entire length of the rotating part, creating continuous convection and significantly improving heat transfer effectiveness compared to static surface contact.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This system effectively controls the temperature of the rotating parts by ensuring direct and efficient heat transfer, overcoming previous limitations and enabling precise temperature management, thus enhancing the operational safety and efficiency of high-temperature centrifugal pumps.
Implementation Method 1
the heat exchange fluid therein is capable of rotating simultaneously with the rotating parts of the cantilevered centrifugal pump and flowing along the axial direction of rotating parts
Implementation Method 2
connected with an external heat exchanger via an external channel
Data Source
AI summary
A cooling or heating fluid circulation system of a cantilevered centrifugal pump, comprises a pump shaft, one end of which is connected with a vane wheel, a shaft sleeve sleeved on the periphery of the pump shaft, a left sealing gland and a right sealing gland, which are sleeved on the periphery of the shaft sleeve, are connected in sequence from one side of the vane wheel along the axial direction of the shaft sleeve; the gap between the left sealing gland and the said shaft sleeve is arranged with an inside rotating sealing ring fixed with the shaft sleeve and an inside stationary sealing ring fixed with the left sealing gland, an outside rotating sealing ring fixed with the shaft sleeve and an outside stationary sealing ring fixed with the right sealing gland are arranged in the gap between the right sealing gland and the shaft sleeve and away from the left sealing gland; a flow-restricted ring is arranged between the inner peripheral surface of the right sealing gland and the shaft sleeve; and a heat exchange fluid circulation channel, which is formed among the gap between the right sealing gland and the shaft sleeve, the shaft sleeve and the pump shaft, is connected with an external heat exchanger via an external channel. The present invention is capable of directly cooling or heating the rotating parts which are most in need of cooling or heating, thus the temperature of the rotating parts can be kept in a certain range.