HORIZONTAL SHAFT SUBMERGED PUMP AND SUCTION PUMP USED FOR HORIZONTAL SHAFT SUBMERGED PUMP

• Main Authors: OKADA MITSUHIRO, WATABE SEIJI, KOGA HIROSHI, WATANABE NORIAKI
• Format: Patent
• Language: English; Japanese
• Published: 16.09.2021
• Subjects: BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-POSITIVE DISPLACEMENT PUMPS; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; WEAPONS

To provide a horizontal shaft submerged pump which transits to an operation mode in which a rating operation is performed while automatically sucking air in accordance with a water level on a suction side.SOLUTION: A horizontal shaft submerged pump comprises: a second suction opening 14 which is provided at the upstream side of an impeller 3 of a horizontal shaft submerged pump 1 and opened at a position higher than an upper end of a first suction opening 8 and in which an upper end of an intake part is a threshold of an air-water mixed drain operation M2 and a drain standby operation M3; and a third suction opening 16 which is opened at a position higher than the upper end of the second suction opening 14 and in which the upper end of the intake part is a threshold of a total drain operation M1 and the air-water mixed drain operation M2. An operation time in the drain standby operation M3 can be shortened while automatically switching to the total drain operation M1, the air-water mixed drain operation M2 and the drain standby operation M3 in accordance with a preset water level, thereby preventing a sudden change of load applied to the horizontal shaft submerged pump.SELECTED DRAWING: Figure 2 【課題】 吸込側の水位に応じて自動的に空気を吸気しながら定格運転を行う運転モードに移行する横軸水中ポンプを提供する。【解決手段】 横軸水中ポンプ１の羽根車３よりも上流側に設けられ、第１吸込開口８の上端よりも高い位置に開口し、吸気部の上端が気水混合排水運転Ｍ２と排水待機運転Ｍ３の閾値である第２吸込開口１４と、第２吸込開口１４の上端よりも高い位置に開口し、吸気部の上端が全量排水運転Ｍ１と気水混合排水運転Ｍ２の閾値である第３吸込開口１６と、を有するもので、予め設定した水位に応じて全量排水運転Ｍ１、気水混合排水運転Ｍ２、排水待機運転Ｍ３に自動に切り替わりつつ、排水待機運転Ｍ３での稼働時間を短くできるもので、横軸水中ポンプにかかる負荷の急変を防止することができる。【選択図】図２