JP2820234B2 - Crushing pump - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crushing pump for cutting and crushing solid matter mixed in a liquid at a sewage treatment plant or the like and performing pumping. It is related. 2. Description of the Related Art In general, a crushing pump of this type is provided with a crushing impeller which is fixed to a rotary shaft penetrating a shaft sealing portion of the pump case in a flow path in the pump case. A crushing grid is provided in the vicinity of one side of the car, and solids are crushed between respective edges of the corresponding crushing impeller and the grid holes of the crushing grid. The discharge is performed by rotation of a discharge impeller provided behind the flow path through the hole. In this type of crushing pump, since a large amount of sand or crushed dust is contained in water, the water enters between the oil seal of the shaft sealing portion and the outer periphery of the rotating shaft to accelerate the abrasion of the rotating shaft and the like. Conventionally, a hydraulic chamber is connected to the inside of the oil seal to prevent leakage, and clean pressure water such as tap water is injected into the hydraulic chamber, and hydraulic pressure is applied through a gap between the discharge impeller and the pump case. The sewage that is about to enter the chamber is pushed back by clean pressure water in the opposite direction to prevent the sewage from entering, thereby preventing wear of the oil seal and the rotating shaft. [0004] Therefore, installation of a crushing pump requires facilities such as water supply, which is troublesome and expensive, and the amount of pressurized water is reduced. With a conventional crushing pump, the volume is 5 liters or more per minute, which is problematic in terms of cost and waste of resources. According to the present invention, a wear-resistant oil seal is provided inside a shaft seal portion of a crushing pump, and a felt-made filler is provided outside the wear-resistant oil seal. An oil supply chamber that can be supplied with oil from the outside is provided next to the oil supply chamber, an oil seal is provided at an outer end of the oil supply chamber, and the outer circumference of the rotary shaft facing the oil-resistant oil seal provided inside the shaft sealing portion is worn. It is covered with a material having a property. With the rotation of the rotating shaft, almost all of the sewage is sealed by a wear-resistant oil seal. This oil seal is lubricated by lubricating oil in the oil supply chamber which gradually leaks out through a felt-made filler. Has been prevented from abrasion,
Further, since the facing rotating shaft is protected by the wear-resistant material, the wastewater can be sealed for a long time. Even if sewage slightly passes through the wear-resistant oil seal, the oil seal at the outer end prevents the release to the atmosphere. An embodiment of the present invention will be described below in detail with reference to the drawings. In the figure, the crushing pump 1 is configured as follows. That is, the pump case 2 is formed such that the suction case 5 is fixed to one side of the main body case 3 via the intermediate case 7. That is, the intermediate case 7 is fixed to the pump case 3 by the bolts 9, and the suction case 5 is appropriately attached to the intermediate case 7 on the crushing grid 11, and on the outer periphery of the crushing impeller 13 rotating facing the crushing grid 11 at an appropriate gap. It is fixed by a bolt 17 via an outer ring 15 provided with a gap. A discharge port 19 is provided in an upper direction of the main body case 3 orthogonal to the suction case 5, and sewage sucked from the suction case 5 is discharged from the suction path 21 to the outside through the discharge path 23 through the inside of the main body case 3. Is done. Suction path 21
Inside, the crushing impeller 13 is fixed to the rotating shaft 25 by a key 27 and a bolt 29, and in the main body case 3, the discharge impeller 31 is locked to the key 33 and the bolt 29 is Has been fixed by. An annular adjusting body 35 facing the discharge impeller 31 with an appropriate gap is provided on one axial side surface of the main body case 3 so as to be movable in the axial direction. Sealed by seals 37 and 39. An annular threaded body 41 is fitted on the outer periphery of the outer ring 15 between the intermediate case 7 and the suction case 5 so as to be reciprocally movable in the axial direction, and penetrates through the intermediate case 7 slidably in the axial direction. 43 is integrally fixed to the adjustment body 35. On the outer periphery of the screw body 41, an annular handle 4 screwed with a screw portion 45 is provided.
7 is rotatably screwed, and the adjusting body 35 is reciprocated in the axial direction by rotating the handle 47. A shaft seal portion 48 provided at the center of the outer surface of the main body case 3 has a wear-resistant oil seal 4
9. An oil seal 51 with a normal rubber lip is mounted on the outside, and a felt filler 53 is mounted in the middle.
A grease nipple 55 communicates with the grease nipple 55 to provide an oil supply chamber 87 filled with grease or other oil and fat from the outside, thereby preventing foreign matter from entering and preventing rotation of the rotating shaft 25. Cylindrical sleeve 5 on the outer periphery of
7 is fitted, and a wear-resistant material 59 such as ceramic is thermally sprayed on a portion of the outer periphery of the sleeve 57 which is easily worn. The rotating shaft 25 is supported by bearings 61 and 65 that are integrally fixed to the main body case 3 via bearings 63 and 65, and a power transmission flange 67 is fixed to an end. A blade portion is formed at the front edge of the crushing impeller 13, and crushes a large solid material corresponding to the cutting blade 69 provided near the suction side.
The cutting blade 69 projects obliquely and slidably into the suction case 5, and its rotation is locked by a bolt 73 that locks into a groove 71 in the axial direction. Screws 79 having different pitches are provided on bolts 77 screwed to the end surfaces of the cutting blades 69 by screws 75, and the lid 81 to be screwed is fixed to the suction case 5 by bolts 83. Cap nut 85 screwed into the screw 79
Are provided as lock nuts. The wear-resistant oil seal 49 is provided on the built-in ring 91a from the inside, and the filler 53 and the oil supply chamber 87 are provided on the built-in ring 91b from the outside. The seal 51 is provided on the built-in ring 89a from the outside, and the grease nipple 55 is attached to the outer ring 89a for supplying grease.
The ring 1a, the ring 91b and the ring 89a are engaged in the shaft sealing portion 48 of the main body case 3 (see FIG. 3). In the above embodiment, when the driving device is operated, the rotating shaft 25 rotates via the flange 67, and the liquid is discharged from the suction passage 21 of the suction case 5 by the rotation of the crushing impeller 13 and the discharge impeller 31. It is sucked, passed through the inside of the main body case 3 and discharged from the discharge passage 23 to the outside. The solid matter mixed into the liquid is crushed between the cutting blade 69 and the leading edge of the crushing impeller 13, and the solid matter having passed through the crushing impeller 13 is formed between the rear edge of the crushing impeller 13 and the crushing lattice 11. The particles are further finely crushed between them, and are discharged outside through the discharge path 23 by the discharge impeller 31 through the crushing grid 11.
For example, if the water level of the sewage treatment tank is high and the flow rate of the pump is excessive, the crushing capacity of the pump is insufficient, and solids that are not sufficiently crushed are discharged from the discharge impeller 31 and the inner wall surface of the main body case 3 (in this embodiment, the adjusting body 35). In this case, if the steering wheel 47 is rotated to move the adjustment body 35 to the left in FIGS. 1 and 2 to widen the gap, The clogged solids are removed as the discharge impeller 31 rotates. If the flow rate of the pump is expected to be excessive,
If the gap between the adjusting body 35 and the discharge impeller 31 is widened by operating the 7, the normal operation can be maintained without the solid matter clogging. The sewage is almost completely sealed by a wear-resistant oil seal 49. The oil seal 49 is lubricated by oil and fat in an oil supply chamber 87 which gradually leaks out through the filler 53 to prevent wear. . Furthermore, the facing rotating shaft is protected by a sleeve coated with a wear-resistant material. The grease in the oil supply chamber 87 is grease nipple 55
, The wastewater is sealed for a long period of time. Even if a small amount of sewage leaks from the abrasion-resistant oil seal 49, the outer end oil seal 51
As a result, the outflow to the open air portion is prevented. FIG. 5 shows another embodiment, in which an oil seal 51 of a shaft sealing portion 48, an oil supply chamber 87, and a filler 53.
Ring body provided with oil seal ring body 91 provided with oil seal 49
Are separately provided, and are engaged in the shaft sealing portion 48 of the body case 3 formed integrally. According to the present invention, the infiltration of wastewater into the shaft seal portion can be prevented, the wear of the oil seal and the rotating shaft is reduced by lubrication, and the outflow of wastewater from the shaft seal portion is prevented. It is not necessary to inject clean water to prevent infiltration of sewage, so that no water supply system is required for installation, and it is possible to easily and inexpensively achieve equipment on the shaft seal and its maintenance and maintenance for a long period of time. Things.

[Brief description of the drawings] FIG. 1 is a side sectional view of one embodiment of the present invention. FIG. 2 is an enlarged side sectional view of a main part of the present invention. FIG. 3 is an enlarged side sectional view of a main part of the present invention. FIG. 4 is an enlarged side sectional view of a main part of the present invention. FIG. 5 is an enlarged side view of a main part of another embodiment. [Explanation of symbols] 2 pump case 11 crushed lattice 13 Crushing impeller 25 rotation axis 31 Discharge Impeller 48 Shaft seal 49 Abrasion resistant oil seal 51 Oil seal 53 filler 57 sleeve 87 Refueling room

Continuation of front page       (56) References JP-A-59-63398 (JP, A)                 JP-A-60-91067 (JP, A)                 Shokai Sho 56-71984 (JP, U)                 60-19721 (JP, U)                 Actual opening 58-158859 (JP, U)                 Shokai Sho 59-194596 (JP, U)                 Shokai Sho 61-77475 (JP, U)                 Actual opening 58-174962 (JP, U)                 Japanese Utility Model Showa 58-174963 (JP, U)                 Showa 60-182567 (JP, U)                 60-173699 (JP, U)                 Jikken Sho 53-33068 (JP, Y1)                 Jikken 33-12402 (JP, Y1)

Claims (1)

(57) [Claims] In the flow path in the pump case 2, the pump case 2
A crushing impeller 13 fixed to the rotating shaft 25 penetrating the shaft sealing portion 48, and a crushing lattice 11 close to one side of the crushing impeller 13; In the crushing pump for sewage treatment provided with a discharge impeller 31 at the same time, a friction-resistant oil seal 49 is provided inside the shaft sealing portion 48, and a felt-made filler is provided outside the friction-resistant oil seal 49. An oil supply chamber 87 capable of supplying oil from the outside via 53 is provided adjacently, an oil seal 51 is provided at an outer end portion of the oil supply chamber 87, and faces a wear-resistant oil seal 49 provided inside the shaft sealing portion. A crushing pump wherein the outer periphery of the rotary shaft 25 is coated with a wear-resistant material.