JPS6032997A - Vertical shaft pump for (continuously water sucking) operation - Google Patents

Abstract

PURPOSE:To provide possibility of continuous operation by a simple construction by putting inside an impeller in communication with outside the pump casing, and by eliminating occurrence of any air choke phenomenon entirely. CONSTITUTION:A certain size of gap b is reserved between the outside surface of the boss part 11 of an impeller 5 and the inside surface of through hole 12 formed in a back face cover 10. A communicative hole e' for a void 15 to outside the pump casing is located at least above said back face cover 10. If an air choke state is near to be in effect in the low water level operating condition, the air which is going to stagnate in the impeller 5 is released always to outside the pump casing via a small hole a, gap b, communicative hole e, void 15, and communicative hole e', so that there is no risk of incurring the air choke state.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water-operating state axial pump that pumps water at a low water level, that is, pumps water while simultaneously sucking air.

Conventional vertical shaft submersible type pumps (chamber shaft type pumps in which the motor is installed on a mount on the top of the pit and the pump part is located at the bottom of the pit) and submersible pumps (general type pumps in which the electric motor and pump part are integrated) When the water level drops and the vertical shaft type pump enters river water operation, the air sucked in with the water stays inside the impeller and suction cover, causing an air blockage phenomenon and making it impossible to pump water. The only way to resolve this situation is to temporarily stop the pump or wait for the water level to rise; therefore, continuous operation at a low water level was impossible. However, since continuous operation is often required at low water levels, a flexible structure to automatically release the air-occlusion soft wire has been considered, but this has problems such as the structure being complex and cost high. Not only is there
+B] It was impossible to achieve such an effect.

Therefore, the present invention aims to provide a construction of a water-operating state shaft type pump that is capable of continuous river water operation with an extremely simple structure. a small hole penetrated through the impeller, an annular gap formed between the inner circumferential surface of the through hole of the back cover facing the upper surface of the upper substrate of the impeller and the outer circumferential surface of the boss portion of the impeller; The water-operating shaft type pump is characterized in that the inside of the impeller and the outside of the pump casing are communicated through communication holes communicating with the outside air above the back cover.

Embodiments of the present invention will be described in detail below with reference to drawing)C.

FIG. 1 shows an embodiment of the present invention in a chamber-shaft submerged pump, in which +11 is an outer cylinder, (2) is an upper casing, (31 is a lower casing, (4) is a rotating shaft, and The outer cylinder (11) is provided so as to pass through the upper casing (2) and the lower casing (3), and an impeller (5) with a back blade is attached to the lower end of the rotating shaft (4) that protrudes into the lower casing f31. (6) is a suction cover connected to the lower end fil1 opening of the lower casing (3), (7) is a suction port opened in the same suction cover (6),
(8) is a discharge port opened on the inner peripheral wall side of the lower case (3), and (9) is a pumping pipe. Further, (1+1 is a rear cover, which is provided on the surface facing the upper surface of the upper substrate (5') of the impeller (5), and
) and the through hole (I
A required gap (b) is provided between the inner circumferential surface and the inner peripheral surface. 0 is a seal cover provided above the rear cover 00, and the space between the seal cover 63 and the rotating shaft (4) is sealed with a required shaft sealing device 04, and the seal cover (13 and A necessary empty space 0c4 is formed between the back cover q.Also, (3) is a small hole penetrated near the boss part all in the upper substrate (51) of the impeller (51).
C) is a communication hole that communicates the gap (b) with the vacant room QS;
(C) is a communication hole that communicates the empty chamber 05 with the outside of the pump casing, and the communication hole (e+) is opened at least above the back cover 01.

Since this embodiment has the above configuration, even if an air blockage condition is about to occur in the low water level operation state as shown in FIG. 1, the air trapped inside the impeller (5) will be removed.
Small hole (a), gap (b), communication hole (C), empty room a! Since the air is always discharged outside the pump casing via the communication hole (C) and the air flow hole (C), air blockage will not occur.

FIG. 2 shows an embodiment of the present invention in a submersible pump, and its structure 1 functions and effects are almost the same as those of the previous embodiment. Note that ae in the figure indicates an electric motor.

As explained in detail above, according to the present invention, the air blockage phenomenon can be completely and automatically eliminated with an extremely simple configuration of communicating the inside of the impeller with the outside of the pump casing, and therefore the air can be divided into multiple branches. Even during suction hydraulic operation, air clogging does not occur, and water can be pumped at a low water level at all times. The ability to continuously pump water at this low water level is especially effective when pumping water containing solids.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing an embodiment of a chamber shaft submersible pump, and FIG. 2 is a longitudinal sectional view showing an embodiment of a submersible pump. In the figure, (a): Small hole (b): Gap (C) Two-way connection (C) Two-way connection (2): Upper casing (3): Lower casing (4)
) Two rotating shafts (5) Two impellers (5) Two upper substrates 0θ: Rear cover αD: Boss part 0: Through hole α9: Vacant patent applicant Tora Inoue Osamu Oshiro Noriharu Ariyoshi

Claims (1)

[Claims] 1. A small hole penetrated near the boss in the upper board of the impeller,
An annular gap formed between the inner surface of the through hole of the back cover facing the upper surface of the upper substrate of the impeller and the outer circumferential surface of the boss part of the impeller, and an area communicating with the annular gap and above the back cover that is air-filled. through the respective communication holes that communicate with the
A vertical shaft type pump for water operation, characterized by communicating the inside of the impeller with the outside of the pump casing.