JPH0356895U

JPH0356895U -

Info

Publication number: JPH0356895U
Application number: JP11584189U
Authority: JP
Priority date: 1989-10-03
Filing date: 1989-10-03
Publication date: 1991-05-31
Anticipated expiration: 2004-10-03
Also published as: JPH089438Y2

Description

[Brief explanation of drawings]

第１図は本考案の第１実施例を示す全速待機運
転ポンプの縦断面図、第２図ａは同じく第２実施
例を示す縦断面図、同図ｂは同図ａの−線に
よる要部断面図、第３図ａは同じく第３実施例を
示す縦断面図、同図ｂは同図ａの−線による
要部断面図、第４図は空気流入量の変化によるポ
ンプ性能の変動を示す線図、第５図は先願にかか
る全速待機運転ポンプの縦断面図、第６図及び第
７図は立軸ポンプの作用説明図である。１……吸込水槽、２……羽根車、３……ポンプ
、４……吸込管、５……貫通孔、６……空気管、
１５……挿入管部、２５，３５……逆流防止バツ
フル。 FIG. 1 is a vertical cross-sectional view of a full-speed standby pump showing the first embodiment of the present invention, FIG. 2 a is a longitudinal cross-sectional view of the second embodiment, and FIG. Fig. 3a is a vertical sectional view showing the third embodiment, Fig. 3b is a sectional view of the main part taken along the - line in Fig. 3a, and Fig. 4 shows fluctuations in pump performance due to changes in air inflow. FIG. 5 is a longitudinal sectional view of the full-speed standby pump according to the prior application, and FIGS. 6 and 7 are diagrams illustrating the operation of the vertical shaft pump. 1... Suction water tank, 2... Impeller, 3... Pump, 4... Suction pipe, 5... Through hole, 6... Air pipe,
15...Insertion tube part, 25, 35...Backflow prevention buttful.

Claims

[Scope of Claim for Utility Model Registration] 1. A through hole is provided in the suction pipe on the impeller inlet side, and an air pipe that opens above the highest water level and communicates with the outside air is attached to the through hole, so that the suction pipe is stable below the lowest operating water level. In a vertical shaft pump that enables full-speed standby operation by allowing air to flow in to reduce the displacement, or by causing air to accumulate at the impeller inlet below the minimum operating water level and stopping drainage, the inner wall of the suction pipe The air pipe is opened at a distance of 20 to 70% of the radius of the suction pipe toward the vertical axis, so that air can flow in even in a small water flow area where backflow occurs in the suction pipe. Full speed standby pump. 2. The full-speed standby according to claim 1, characterized in that a through hole is provided leading from the outer wall of the suction pipe to the tip of a swirl prevention baffle provided on the inner wall of the suction pipe, and an air pipe is opened at the tip of the buffle. Driving pump. 3. The full-speed standby operation according to claim 2, characterized in that one side of the upstream side of the swirl prevention buttle provided on the inner wall of the suction pipe is cut off gently to prevent dirt from getting entangled. pump. 4. An air pipe communicating with the outside air is opened on the side of the downstream side of the swirling component of the pumped water on the rib or buttle, which is a protrusion protruding from the inner wall of the suction pipe to prevent swirling. The full speed standby pump according to claim 1.