Elastic containment assembly for a pump

A containment assembly (10) for a pump provided with at least one pumping group (12, 14, 16, 18) and with at least one power transmission system (20) for transmitting power to said pumping group, the containment assembly (10) comprising:

• a substantially cylindrical floating containment vessel (22) provided with a through opening at one of its two ends and a circumferential edge monolithically formed with said vessel, said floating containment vessel (22) being configured to at least partially enclose the pumping group (12, 14, 16, 18) and the respective power transmission system (20);
• and at least one fixed closure plate (24) configured to be fixed to a predetermined outer structure, said at least one fixed closure plate (24) sealably coupled with the floating containment vessel (22) at the end having the through opening and configured to hermetically enclose, in cooperation with said floating containment vessel (22), the pumping group (12, 14, 16, 18) and the respective power transmission system (20), the containment assembly (10) being characterised in that on a predetermined contact portion between the floating containment vessel (22) and the fixed closure plate (24) at least one wave spring (26) is provided, configured to keep the pumping group (12, 14, 16, 18) dynamically under compression by means of the fixed closure plate (24), said at least one wave spring (26) allowing relative axial movement between said floating containment vessel (22) and said fixed closure plate (24) to absorb possible thermal dilations of components of the pumping group (12, 14, 16, 18) or to absorb volumetric expansions of a pumped fluid, and further characterised in that the circumferential edge of said floating containment vessel (22) at said through opening is bent over said fixed closure plate (24), said at least one wave spring (26) being provided on a contact portion between said circumferential edge of said floating containment vessel (22) and said fixed closure plate (24).