Rolling Diaphragm Pump With Integrated Nut Guide for Compact Axial Layout
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional rolling diaphragm pumps are elongated in the axial direction due to the separate provision of a restriction mechanism for the screw shaft and a guide mechanism, necessitating additional components that increase the pump's length.
Innovation Solution
The rolling diaphragm pump integrates a guide shaft through an eccentric insertion portion of the nut portion, restricting the nut's rotation while guiding its reciprocation, eliminating the need for a separate restriction mechanism, and incorporates a bushing to reduce wear and a transmission mechanism to align the motor orthogonally, allowing for compact axial design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate restriction mechanism is provided for the screw shaft, then the rotation of the screw shaft can be restricted, but the pump becomes long in the axial direction
Solution Approach 1:
The guide mechanism and restriction mechanism are merged into a single integrated guide mechanism. The guide grooves formed on the outer peripheral surface of the screw shaft serve dual functions: guiding the reciprocation of the nut and restricting the rotation of the screw shaft relative to the nut. This eliminates the need for a separate restriction mechanism and reduces the axial length of the pump.
Solution Approach 2:
The guide mechanism is designed to perform multiple functions simultaneously. The guide grooves not only guide the reciprocating motion of the nut along the screw shaft but also restrict the rotational movement of the screw shaft. This multi-functionality reduces the number of components and shortens the axial length of the pump.
2Reliability
If a separate restriction mechanism is provided for the screw shaft, then the rotation can be controlled, but the device complexity increases
Solution Approach 1:
The guide mechanism and restriction mechanism are combined into a single integrated structure. The guide grooves on the screw shaft serve both to guide the nut's reciprocation and to restrict the screw shaft's rotation, eliminating the need for additional separate mechanisms and reducing overall device complexity.
Solution Approach 2:
The guide mechanism performs multiple functions: it guides the reciprocating motion of the nut and simultaneously restricts the rotation of the screw shaft. This multi-functional design reduces the number of components and simplifies the overall mechanism.
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
The pump achieves a compact axial configuration, reduces wear, and enables energy savings through motor downsizing by decelerating the rotation, thus optimizing space and efficiency.
Implementation Method 1
a screw shaft (output shaft) that reciprocates together with the shaft, and a nut (screw nut) that is rotationally driven relative to the screw shaft by the motor. When the nut is rotationally driven by the motor, the screw shaft reciprocates in the axial direction relative to the nut.
Implementation Method 2
a rolling diaphragm becoming deformed to change the volume of a pump chamber, whereby the chemical solution is sucked into the pump chamber and discharged from the pump chamber to the outside
Implementation Method 3
the rotation of the nut portion is restricted by the guide shaft, which is inserted through the insertion portion of the nut portion and fixed to the housing. Accordingly, the nut portion reciprocates in the axial direction relative to the screw shaft.
Implementation Method 4
a bushing provided in the insertion portion of the nut portion and slidable in the axial direction relative to the guide shaft. by the bushing sliding in the axial direction relative to the guide shaft, the nut portion can be caused to reciprocate, so that wear of the nut portion against the guide shaft can be suppressed.
Data Source
AI summary
A rolling diaphragm pump includes a housing, a rolling diaphragm, a piston, a motor, and a ball screw. Rotational motion of the motor is converted into linear motion by the ball screw to cause the piston to reciprocate, and a volume of a pump chamber is changed by deformation of the rolling diaphragm, thereby sucking and discharging a transport fluid. The ball screw includes a screw shaft placed coaxially with an axis and rotationally driven about the axis relative to the housing by the motor, and a nut portion screwed to the screw shaft so as to be reciprocatable in an axial direction and having an insertion hole formed over an entirety thereof in the axial direction at a position eccentric to the axis. A guide shaft configured to guide reciprocation in the axial direction of the nut portion is inserted through the insertion hole of the nut portion and fixed to the housing.