Pump and assembly method of the same

Abstract

To provide a pump which prevents back flow of water to improve the pump efficiency while facilitating assembly and designing. A pump includes an impeller (10) and a casing (20) for storing the impeller (10). In the pump, an annular gap (G) is formed between an outer peripheral surface (11a) of a suction port (11) and the casing (20) in the impeller (10). The outer peripheral surface (11a), which is located at the inner side of the annular gap (G) with respect to the casing (20), includes a seal member (30). The seal member (30) is stored so as to move in an axial direction on the outer peripheral surface (11a) between an open state, in which the seal member (30) is separated from the annular gap (G), and a closed state, in which the seal member (30) is moved from the open state to the annular gap (G) side to close the annular gap (G).

Description

technical field [0001] The present invention relates to a pump including an impeller and a housing for accommodating the impeller, and an assembly method thereof. Background technique [0002] In the past, in such pumps, in order not to cause trouble in operation due to contact between the rotationally driven impeller and the casing, the outer peripheral surface of the suction port of the impeller and the casing are usually formed in a non-contact manner between them. A state in which an annular gap is formed. In addition, in this case, in order to prevent water from flowing backward from the high-pressure side of the rotationally driven impeller to the low-pressure side through the annular gap, the annular gap sandwiches the sealing member without creating a gap, thereby preventing backflow and improving pump efficiency. Improvement (for example, refer to the specification of Chinese Utility Model Publication No. 200949545 (Patent Document 1)). [0003] However, in this c...

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Problems solved by technology

[0003] However, in this case, it is necessary to assemble the housing and the impeller in order to sandwich the sealing member in the annular gap, and in order to properly sandwich the sealing member in the annular gap, the dimensional accuracy of the impeller is required, and processing and assembly , more complex in design

In addition, the sealing member is attached to the gap between the outer peripheral surface of the suction port of the impeller and the casing, and strong friction occurs on the sealing member, and the wear caused by the rotational driving of the impeller is severe, and there is a problem in terms of durability.

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