Piston Pump Inlet Valve Insert Layout for Lower Dead Space
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Solution Overview
Problem
Piston pumps for high-pressure cleaning devices face challenges in manufacturing costs due to the use of stainless steel inlet valves and have reduced suction characteristics due to increased dead space caused by the arrangement of the guide member and inlet valve stem, while plastic pump housings lack sufficient compressive strength.
Innovation Solution
The piston pump design incorporates a plastic insert part with an annular inlet valve seat and guide member upstream of the inlet valve seat, combined with metal housing parts, reducing manufacturing costs and minimizing dead space for improved suction characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stainless steel insert parts are used for inlet valves, then manufacturing precision and durability are improved, but manufacturing costs increase
Solution Approach 1:
The inlet valve assembly is segmented into two functional parts: the insert part (valve seat and guide member) made of stainless steel for durability, and the valve plate made of plastic for cost-effectiveness. This segmentation allows each component to be optimized for its specific function while balancing overall manufacturing cost.
Solution Approach 2:
The inlet valve assembly uses composite construction by combining stainless steel (for the insert part requiring durability) with plastic (for the valve plate). This composite approach allows the system to achieve the reliability of metal components while reducing overall manufacturing costs through the use of cheaper plastic materials for non-critical components.
2Ease of manufacture
If the guide member and inlet valve stem are arranged downstream of the inlet valve seat, then manufacturing is simplified, but dead space increases and suction characteristics deteriorate
Solution Approach 1:
Instead of arranging the guide member and inlet valve stem downstream of the inlet valve seat (conventional arrangement), the invention inverts this arrangement by positioning the guide member upstream of the inlet valve seat. This inversion reduces the dead space volume in the pump chamber and improves suction characteristics while remaining manufacturable.
3Ease of manufacture
If plastic material is used for pump housing, then manufacturing cost is reduced, but compressive strength is insufficient
Solution Approach 1:
Different parts of the pump housing have different material qualities: the pump housing body is made of plastic for cost-effectiveness, while the insert parts (inlet valve seat and guide member) are made of stainless steel for local durability and compressive strength where required. This local quality differentiation allows cost reduction in non-critical areas while maintaining strength where needed.
Data Source
AI summary
A piston pump for a high pressure cleaning device is provided, having a pump housing, which includes a first housing part and a second housing part. The first housing part forms a suction conduit and a pressure conduit, and the second housing part forms a plurality of pump chambers each in flow connection with the suction conduit by an inlet channel and with the pressure conduit by way of an outlet channel. The first insert part includes an inlet valve seat and a guide member arranged offset from said inlet valve seat. The inlet closing body includes an inlet valve stem that adjoins the inlet valve plate and is displaceably mounted on the guide member. The first insert part includes an annular inlet valve seat body that points toward the pump chamber and forms the inlet valve seat, wherein the guide member is arranged upstream of the inlet valve seat.