US 11,873,821 B2
Pump
Kimihiko Mitsuda, Tokyo (JP); and Shuhei Sasaki, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Appl. No. 17/432,708
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
PCT Filed Feb. 26, 2020, PCT No. PCT/JP2020/007589
§ 371(c)(1), (2) Date Aug. 20, 2021,
PCT Pub. No. WO2020/175508, PCT Pub. Date Sep. 3, 2020.
Claims priority of application No. 2019-033115 (JP), filed on Feb. 26, 2019.
Prior Publication US 2022/0170476 A1, Jun. 2, 2022
Int. Cl. F04D 13/10 (2006.01); F04B 47/06 (2006.01); F04D 1/08 (2006.01); F04D 13/06 (2006.01); F04D 29/42 (2006.01); F04D 29/58 (2006.01); H02K 5/128 (2006.01); F04D 1/06 (2006.01); H02K 5/132 (2006.01); F04D 29/08 (2006.01)
CPC F04D 13/10 (2013.01) [F04B 47/06 (2013.01); F04D 1/06 (2013.01); F04D 1/08 (2013.01); F04D 13/06 (2013.01); F04D 13/0646 (2013.01); F04D 29/426 (2013.01); F04D 29/588 (2013.01); H02K 5/128 (2013.01); H02K 5/132 (2013.01); F04D 29/086 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A pump comprising:
an inner element having a plurality of pump bodies that pump an underground liquid, a pump shaft that extends in a vertical direction and on which the plurality of pump bodies are disposed in the vertical direction, a motor shaft that is connected to one end of the pump shaft and extends in the vertical direction, a magnetic part that is provided on an outer peripheral surface of the motor shaft, and a pump stator that has a tubular shape for accommodating the plurality of pump bodies and extends in the same direction as the pump shaft;
a production pipe having a tubular shape extending in the vertical direction; accommodating the inner element inside the production pipe and supporting the inner element; and
a motor stator disposed at a lower portion of the production pipe and constituting an electric motor together with the magnetic part,
a cylindrical gap is formed between the production pipe and the pump stator,
the pump stator has a tubular pump casing that surrounds the plurality of pump bodies,
a penetrating portion is provided in the pump casing,
the penetrating portion is a hole that penetrates the pump casing in a radial direction from an inside of the pump casing to an outside of the pump casing, and
the penetrating portion is formed in a portion of the pump casing that faces a pump body, which is located in an intermediate stage of the plurality of pump bodies, in the radial direction.