Abstract
The article presents the concept of a new circulation pump for low power heating or cooling system, dedicated to systems where it is necessary to ensure a slight liquid flow during periods of operation at a significantly low efficiency of the systems. The assumption for the construction of the new pump was the possibility of its installation in the pipeline axis. The proposed prototype design includes the application of a patented solution to relieve the axial force acting in a flow system [1,2]. Additionally, a new permanent magnet DC motor designed and manufactured for this pump was used. The design of the pump takes into account the requirement of maximum silence, which results from its intended use in close proximity to human habitation. The design of the pump has been tested numerically. The results of numerical tests are presented. The pump was made in the rapid prototyping technique in a 3D printer. The pump was built into a dedicated test stand with measuring instruments verified in terms of the quality of measurements. A series of measurements was made on the basis of which the flow characteristics of the pump were determined. During the research, risks for the operation of the new structure were identified, which will be taken care of in a further stage of the research, and the structure, after removing the defects, will be directed to production [3].
Highlights
The heating / cooling medium circulation pumps for individual applications available on the market, especially in district heating, constitute a wide range of products
The course of construction works, numerical tests, execution and laboratory tests presented in the article confirmed in practice the achievement of the assumed useful lifting height met at the desired volumetric flow rates
The multitude of innovative solutions used in one structure is the reason for the need to improve the presented pump
Summary
The heating / cooling medium circulation pumps for individual applications available on the market, especially in district heating, constitute a wide range of products. Dominating devices with an electric drive motor operating directly in the pumped medium. The motor is rarely separated from the pump flow system due to the significant cost of the gland packing, maintenance-free, for the entire structure [4]. An important gap in the series of types, indicated by a domestic producer of complete heating systems, is a pump with a low head and low flow, which protects the circulation systems against damage during periods of its shutdown. The presented construction and research results are a pump that fulfills the assumptions of operation in systems that are periodically shut down
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