JPH08135598A - Crushing pump - Google Patents

Abstract

PURPOSE: To wash away inside crushed objects both simply and cleanly at the time of washing by making smooth the flow passage in an impeller chamber in a casing body of a crushing pump. CONSTITUTION: In a crushing pump 21 comprising a crushing impeller 27 rotating integrally with an impeller 26 and a lattice, fixed blade 30 fixed on the side of a suction path 25 on rear of the crushing impeller 27, on the side of a suction path 25 in a casing, surface in a flow passage in a casing 22 is machined for a smooth surface finish.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crushing pump for crushing, stirring and mixing solids, powders, etc. contained in a fluid.

[0002]

2. Description of the Related Art In general, a crushing pump is used in various facilities such as wastewater treatment, general chemical industry, civil engineering industry, food industry, etc. that handle fluids containing solids or semi-solids. In order to eliminate troubles such as road blockage,
The solid material in the fluid is cut and crushed into a uniform size, and the mixture is sent under pressure as a solid-liquid mixture.

As a conventional crushing pump of this type, those shown in FIGS. 4 and 5 are known. This crushing pump comprises a pump body 1 provided on the upper part of a base, and a drive motor 5 connected to a rotary shaft 3 supported by a bearing mechanism 2 at the rear of the pump body 1 via a coupling 4. ing.

As shown in FIG. 5, the pump body 1 includes an impeller 7 which is rotated by a rotating shaft 3 inside a casing body 6, and an impeller 7 which is attached to the tip of the rotating shaft 3 on the suction passage side of the casing body 6. A small gap between the crushing impeller 8 that rotates integrally, the intermediate case 9 fixed to the suction passage side of the casing body 6 with a bolt, and the back surface of the crushing impeller 8 on the inner peripheral surface side of the intermediate case 9. Fixed to the grid-like fixed blade 10, a shroud ring 11 similarly provided between the inner peripheral surface of the intermediate case 9 and the crushing impeller 8, and the suction passage of the casing body 6 on the upstream side. Suction casing 1 provided and fixed to the intermediate case by bolts
2 and a cutting blade 13 which penetrates the upper part of the suction casing 12 and has a tip arranged at the front surface of the crushing impeller 8 with a slight gap therebetween.

In this crushing pump, the drive motor 5 is driven, and the rotational force of the drive motor 5 is transmitted to the rotary shaft 3 supported by the bearing mechanism 2 of the pump body 1 via the coupling 4, and the rotary shaft is rotated. By rotating the impeller 7 and the crushing impeller 8 at 3, the crushing impeller 8 crushes the solid matter in the fluid and the impeller 7 pressure-feeds it.

[0006]

However, in the above conventional crushing pump, in order to increase the pump head of the centrifugal pump, the flow path of the casing body 6 is formed so as to gradually expand its diameter by drawing an involute curve. Since the casing body 6 has a complicated shape,
Since it is difficult to manufacture by machining, most casing bodies will be manufactured by casting. Therefore, the impeller chamber in the casing body 6 in which the impeller 7 rotates is also usually used in a state where the casting surface is exposed, and the surface precision is inevitably rough.

However, when the crushing pump is used for equipment such as wastewater treatment, general chemical industry, and construction industry, the casting surface is exposed in the flow passage in the casing body unless the pump head performance is affected. There is no problem in using with,
In the food industry, due to food hygiene issues, the object to be treated remains in the casing body of the crushing pump and rots,
In addition, since it may mix with other types of objects to be processed and affect the quality and taste, it is necessary to clean the inside of the casing body after one process is completed to keep the inside clean. There is.

Therefore, like a conventional crushing pump,
In the case where the casting surface of the casting is exposed in the flow passage in the casing body, there is a problem that even if it is washed, the coarse casting surface is caught by the residue or the like of the object to be treated and is difficult to remove.

The present invention has been made in order to solve the above-mentioned problems, and a smooth surface is provided from the flow path of the impeller chamber in the casing body of the crushing pump so that an object to be treated inside can be easily and easily cleaned during cleaning. The purpose is to provide a crushing pump that can be washed off cleanly.

[0010]

In order to solve the above problems, the present invention provides a casing body, a crushing impeller that rotates integrally with an impeller on the suction passage side of the casing body, and a rear surface of the crushing impeller. The crushing pump having a lattice-shaped fixed blade fixed to the suction passage side, characterized in that the flow passage in the casing main body has a smooth surface finish by machining.

[0011]

According to the present invention, since the flow passage in the casing body is machined to have a smooth surface finish,
By washing with water or the like, the object to be treated remaining in the casing body can be easily and cleanly washed away.

[0012]

Next, the present invention will be described in detail with reference to the drawings. 1 to 3 show a crushing pump according to an embodiment of the present invention. In the figure, the same parts as those shown in the conventional figure are designated by the same reference numerals and the description thereof will be omitted.

The crushing pump 21 penetrates the center of the casing main body 22 having the discharge nozzle 22a formed therein, and rotates the rotary shaft 2.
3 is provided, and the central portion of the rotary shaft 23 is supported by a bearing portion 24 that is attached to the center of the casing body 22 and also serves as a mechanical seal. An impeller 26, which rotates inside the casing main body 22 and pressure-feeds the fluid from the discharge nozzle 22a, is attached via a key to the tip end side of the rotary shaft 23, that is, the suction passage 25 side in the present embodiment, and further to the tip end side thereof. Is the impeller 26 at the suction passage 25 side of the casing body 22.
A crushing impeller 27 that rotates integrally with the above is attached via the key. The end of the crushing impeller 27 on the suction path side is fixed by a fixing nut 23 a screwed onto the tip of the rotary shaft 23.

On the suction passage 25 side of the casing body 22,
The intermediate case 28 is fixed by tightening bolts 29. In this embodiment, six tightening bolts 29 are provided at equal intervals along the circumferential direction of the intermediate case 28. Intermediate case 28 is O
It is attached to the suction passage side inner peripheral surface of the casing body 22 via a ring. A grid-shaped fixed blade 30 is fitted on the inner peripheral side of the intermediate case 28.
And a rear surface of the crushing impeller 27, there is formed a small gap for cutting and crushing by sandwiching solid matter in the fluid. It is cut between the crushing impeller 27 that rotates.

The grid-shaped fixed blade 30 of this embodiment constitutes a shroud ring 30a by forming the shroud ring 30a by forming the outer peripheral portion so as to project forward so as to cover the outer peripheral end of the crushing impeller 27, and this shroud ring 30a. Inside and the crushing impeller 2
The solid material in the fluid sandwiched between the outer blade formed on the outer periphery of the outer peripheral portion 7 and the outer peripheral portion is cut and crushed. Intermediate case 28
A suction casing 31 that forms a suction passage 25 between the suction casing 31 and the casing body 22 is fixed to the front surface of the with a bolt 32. In this embodiment, four bolts 32 are arranged at equal intervals in the circumferential direction. On the flange surface of the suction casing 31 on the intermediate case 28 side, the peripheral end portion of the shroud ring 30a is formed so as to be fitted via a seal portion.

Further, on the outer peripheral side of the intermediate case 28, there is provided an adjusting handle 33 as an adjusting means for axially positioning the intermediate case 28 with respect to the casing body 22. The adjustment handle 33 is formed in an annular shape and has an inner thread formed on an inner peripheral surface thereof to be screwed with an outer thread formed on an outer peripheral surface of the intermediate case 28. A plurality of fitting recesses 33a for rotating are formed along the circumferential direction. Then, by rotating the adjusting handle 33 with a tool, the intermediate case 28 is brought into contact with and separated from the front flange surface 22b of the casing body 22, whereby the grid-shaped fixed blades 30 fixed to the intermediate case 28 and the rotary shaft 23 are fixed. The gap between the crushing impeller 27 and the attached crushing impeller 27 is adjusted.

For example, with the tightening bolt 29 loosened,
When the adjustment handle 33 is turned to the right, the direction in which the intermediate case 28 is separated from the casing body 22 by a predetermined pitch by a screw action from the contact surface of the adjustment handle 33 with the casing body 22 as a starting point, that is, the suction passage 25 side Move to. At this time, the grid-shaped fixed blades 30 fixed to the intermediate case 28 move to the back side of the crushing impeller 27 and come into contact with the crushing impeller 27, so that the adjustment handle 33 does not rotate. By tightening the intermediate case 28 and the casing main body 22 side with the tightening bolts 29 from this state, the outer screw surface of the intermediate case 28, which was in contact with one surface of the inner screw of the adjustment handle 33, is adjusted to the inside of the adjustment handle 33. By being pushed back to the other surface side of the screw, the backlash is returned.

Therefore, by utilizing this action,
It is possible to adjust the clearance of the screw processing tolerance. In the crushing pump of the present embodiment, it is preferable that the gap between the crushing impeller 27 and the grid-shaped fixed blade 30 is adjusted to be about 0.05 mm to 5 mm. Further, by using different materials for the intermediate case 28 and the adjustment handle 33, it is possible to prevent galling of the screw portion.

On the other hand, a flange 22c is formed on the back side of the casing body 22, and a drive motor 35 is directly fixed to the flange 22c with a bolt 36.
Further, in this embodiment, the impeller 26 and the crushing impeller 27 are used.
The rotary shaft 23 for rotating the drive motor 35 is formed integrally with the rotary shaft of the drive motor 35, and the other end side of the rotary shaft 23 projects outward from the rear part of the drive motor 35. Handle 3 for hand rotation during assembly
7 is attached. The rotating shaft 23 may be configured such that the casing body 22 side and the drive motor 35 side are separate bodies, and these are integrated by a coupling.

The casing body 22 of this embodiment
As shown in FIG. 3, the outer shape 22d is formed into a circle by drawing concentric circles as shown in FIG. In addition, the casing body 22
The impeller chamber 22e inside is formed into a circular shape by drawing concentric circles by machining, leaving a predetermined thick portion from the outer peripheral surface. A fitting recess 22f into which the bearing portion 24 is fitted via an O-ring is formed inside the impeller chamber 22e, and the rear portion of the bearing portion 24 is located inside the impeller chamber 22e along the rotary shaft 23 toward the drive motor 35 side. A circular opening 22g is formed to project. Further, the front flange surface 22b on the suction passage side of the casing body 22 and the fitting surface of the intermediate case 28 are similarly machined smoothly.

By forming the casing body 22 in a concentric shape in this manner, machining can be facilitated and the flow passage of the casing body 22 can have a smooth surface finish.

As described above, the crushing pump 2 of this embodiment
According to 1, the flow passage of the casing body 22 is machined to have a smooth surface finish.
It is possible to easily and cleanly wash away the object to be processed remaining in the inner flow path, and especially to prevent mixing of different kinds of object to be processed which affects the quality and taste, and the crushing pump 21 It is possible to prevent the residue and the like of the object to be treated from remaining in the flow path after use and causing it to decompose, which causes a problem in food hygiene.

In the above embodiment, the casing body 2
Although 2 is formed in a concentric circle shape, it is not limited to this, and a high lift is realized by machining by computer-controlled milling so as to expand the flow path of the impeller chamber to form a conventional involute curve. You may do it.

Further, in the crushing pump of this embodiment, the pump can be miniaturized to handle a wide variety of products with a small capacity, and handling and maintenance can be facilitated.

[0025]

According to the crushing pump of the present invention, since the flow passage in the casing body is machined to have a smooth surface finish, the object to be treated remaining in the casing body can be easily removed by washing with water or the like. It can be washed off cleanly,
The inside of the casing body can always be kept clean.

[Brief description of drawings]

FIG. 1 is a side view in which a main part of a crushing pump of the present invention is sectioned.

FIG. 2 is a front view of FIG.

FIG. 3 is a cross-sectional front view of the casing body of FIG.

FIG. 4 is a side view of a conventional crushing pump.

FIG. 5 is a sectional side view of a conventional crushing pump.

[Explanation of symbols]

 21 Crush Pump 22 Casing Main Body 25 Suction Path 26 Impeller 27 Crush Impeller 30 Lattice Fixed Blade

Claims (1)

[Claims] 1. A casing body, and a crushing impeller that rotates integrally with an impeller on the suction passage side of the casing body.
A crushing pump having a lattice-shaped fixed blade fixed to the suction passage side on the back surface of the crushing impeller, characterized in that the flow passage in the casing body is machined to have a smooth surface finish. Crush pump.