JPH02207191A - Flow automatic adjusting device for crushing pump - Google Patents

Abstract

PURPOSE:To invariably feed a fixed quantity of liquid by providing centrifugal pump blades behind crushing blades and adjusting the gap between the front edge of radial blade plates of the blades and the wall plate opposite to it based on the output of a detecting device detecting the change of the water quantity. CONSTITUTION:A crushing pump 5 connected via a suction pipe to an input tank inputted with the waste via a sewage pipe or the like stores centrifugal pump blades 21 fixed to a rotary shaft 19 in the spiral pump chamber 25 of a main body case 17, and crushing blades 39 are fixed at the front end of the rotary shaft 10. The centrifugal pump blades 21 have radial blade plates 47 on the front face of a disk 45 integral with the rotary shaft 19. A circular wall plate 48 is longitudinally movably provided to face the front edge of the blade plates 47. A motor 71 is driven, and the wall plate 48 is moved via a worm screw 65, a worm wheel 53, and a ring 59 formed with a screw section 57 on the outer periphery to keep the gap size detected by a gap detecting device 75 at the proper value in response to the change of the water quantity.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an automatic flow rate adjustment device for a crushing pump used in sewage treatment facilities and the like.

(Prior art and problems to be solved) Conventionally, in sewage treatment facilities, etc., fluctuations in the water level and concentration of the input tank occur depending on the installation location and the season, and the capacity of the crushing pump fluctuates. The crushing pump or the filter for filtration separation was clogged with the crushed materials, making retention management difficult and unfavorable from a sanitary standpoint.

(Means and effects for solving the problem) The present invention provides a centrifugal pump blade behind the crushing blade, and the gap between the leading edge of the radial blade plate of the centrifugal pump blade and the facing wall plate is A control device is installed to adjust the gap according to the signal from the detection device that detects changes in water level or flow rate. The flow rate is maintained constant by adjusting the gap to a predetermined value.

(Embodiment) Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

A crushing pump 5 is connected via a suction pipe 3 to a charging tank 1 into which waste is introduced by a transport vehicle such as a vacuum car or a sewer pipe, etc., and a filtration pump 5 is connected through a discharge pipe 9 equipped with a flow rate detection device 7 to perform filtration and separation. is sent to a drum screen (not shown) or the like. The crushing pump 5 is driven by a motor 3 via a coupling 11. A water level detection device 15 is provided on the side wall of the charging tank 1 to detect the water level.

The crushing pump 5 is constructed as follows.

That is, in the main body case 17, a centrifugal pump blade 21 fixed to the rotating shaft 19 is housed in a spiral pump chamber 25 communicating with the discharge port 23. The rotating shaft 19 is connected to the shaft sealing part 2
It is rotatably supported by a bearing (not shown) provided in a bearing case 29 that penetrates through one side of the main body case 17 via a shaft 7 and is fixed to the outside. The main body case 17 is fixed to a pedestal 33 by legs 31 projecting downward. On the front of the main body case 17 is an intake case equipped with an intake port 35.
The suction port 35 is connected to the pump chamber 25, and the suction port 37 is fixed.
In the middle, a crushing blade 39 is fixed to the front end of the rotating shaft 19, and a crushing lattice 41 is attached to the suction case 37 in close proximity to the rear surface of the crushing blade 39.
Fixed. A crushing blade portion 43 is provided obliquely close to the upper front surface of the crushing blade 39. The centrifugal pump blade 21 has vane plates 45 radially fixed to the front surface of a disc 45 fixed to the rotating shaft 19.1, and facing the front edge of the vane plate 47, an annular wall plate 48 is arranged inside the main body case 17. It is provided so as to be movable in the front and back direction, and the gap size between it and the blade plate 47 changes. A worm gear case 49 is formed at the inner end of the suction case 37, and an annular worm foil 53 is formed between the suction case 37 and the cover plate 51.
is rotatably held and fixed to the main body case 17 via a cover plate 51.

An annular body 59 is provided on the outer periphery of which is formed a threaded portion 57 that is screwed into the internal thread 55 provided on the inner diameter portion of the worm foil 53.
It is fixed to the front end of a plurality of bolts 61 that slidably pass through the cover plate 51. The rear end of the pole 61 is screwed onto the wall plate 48. The worm wheel 53 is engaged with a worm screw 65 fixed to a worm shaft 63. Worm shaft 63
is driven by an electric motor 71 via a joint 67 and a transmission 69. Water level detection device 15. The signal from the flow rate detection device 7 is sent to the control device 73, which rotates the electric motor 71 in forward and reverse directions, and adjusts the gap size detected by the gap detection device 75 to a predetermined gap size calculated based on an appropriate water level or flow rate.

In the above configuration, when the rotary shaft 19 is driven by the electric motor 13, the water in the charging tank 1 is sucked into the suction port 35 by the rotating centrifugal pump blade 21, and is sent out from the discharge port 23 through the discharge pipe 9.

Solids mixed into the water are removed by rotating crushing blades 39.
Crushing blade part 43. It is crushed between it and the crushing grid 41. When the discharge amount changes due to changes in the water level in the charging tank 1, etc., the flow rate detection device 7. In response to the signal from the water level detection device 15, the control device 73 calculates and compares the signal, drives the electric motor 71, and adjusts the gap size to a predetermined gap size. That is, the worm screw 65 is rotated by the drive of the electric motor 71 that rotates in the forward and reverse directions.
When the worm wheel 53 is rotated, the annular body 59 screwed into the female thread 55 moves along with the wall plate 48 in the axial direction of the bolt 61, adjusting the gap between the front edge of the vane plate 47 and the centrifugal pump blade 21. The discharge flow rate is adjusted by.

〔Effect of the invention〕

According to the present invention, it is possible to continuously and automatically manage the flow rate at a constant level with high precision in response to fluctuations in the water level of the charging tank.

In addition, if the structure according to claim (2) is adopted, the structure can be made simple and compact when the movement of the wall plate is operated by an electric motor.

Moreover, by adopting the configuration described in claim (3), the discharge amount can be made constant in response to changes in the water level.

Further, with the configuration described in claim (4), the discharge amount can be made constant depending on the cause of the problem.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of one embodiment of equipment equipped with the device of the present invention, FIGS. 2 and 3 are front and side views of one embodiment of the present invention, and FIG. 4 is a main part of the equipment. The side sectional view and FIG. 5 are control system diagrams. 7...Flow rate detection device 15...Water level detection device 2
1...Centrifugal pump blade 39...Crushing blade 47...
- Wing plate 48... Wall plate 53... Worm foil 57... Threaded portion 59... Ring body
65...Worm screw 71...Electric motor
73...Control device agent Patent attorney Miyoshi Miyoshi
Hidekazu Figure 1 Figure 2 Figure 3

Claims (4)

[Claims] (1) A detection device in which a centrifugal pump blade 21 is provided behind the crushing blade 39, and the gap between the leading edge of the radial vane plate 47 of the centrifugal pump blade 21 and the facing wall plate 48 detects a change in water amount. 7. An automatic flow rate adjustment device for a crushing pump, characterized in that it is operated in conjunction with items 7 and 15 and is adjustable. (2) A threaded portion 57 is provided on the outer periphery of an annular body 59 that is integrally movable in the front and back direction with the wall plate 48, and a worm screw that engages with the outer periphery of a worm wheel 53 that is threaded onto the outer periphery of the annular body 59. 65. The automatic flow rate adjustment device for a fracturing pump according to claim 1, wherein the pulverizing pump 65 is driven by an electric motor 71. (3) The automatic flow rate of the crushing pump according to claim (1) or (2), further comprising a control device 73 that controls the rotation of the electric motor 71 in response to a signal from a detection device 15 that detects the water level of the charging tank 1. Adjustment device. (4) The automatic flow rate adjustment device for a fracturing pump according to claim (1) or (2), further comprising a control device 73 that controls the rotation of the electric motor 71 in response to a signal from the detection device 7 that detects the discharge flow rate. .