JPH09280200A - underwater pump - Google Patents

Abstract

(57) Abstract: A pump casing for accommodating an impeller and a strainer for covering the pump casing can be easily attached and detached. An impeller 31 disposed in a pump casing 35 is attached to a lower end portion of a rotor shaft 24 that passes through an axial center portion of a motor 20, and the pump casing 35 is covered by a strainer 34. . Three mounting portions 35c are provided on the outer peripheral edge of the pump casing 35, and a pin insertion hole 35d is vertically provided in each mounting portion 35c. On the bottom surface of the strainer 34, facing the pin insertion equal holes 35d,
d is provided vertically, and the strainers 34 are attached to the pump casing 35 by being supported by being inserted into the pin insertion holes 35d and being prevented from coming off by an interference fit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relatively small submersible pump used for sprinkling water such as plants in a garden at home or for draining and circulating accumulated water.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a relatively small submersible pump used at home for the purpose of watering garden plants. In this submersible pump, a motor 62 is usually covered with a plastic head cover 61. The lower end surface of the motor 62 has a bracket 63 made of aluminum or plastic.
The lower end portion of the rotor shaft 64, which is in a state of being covered by the shaft portion of the motor 62, extends through the shaft portion of the bracket 63. An impeller 66 arranged inside the pump casing 65 is attached to the lower end of the rotor shaft 64, and the pump casing 65 is covered by a strainer 67. A large number of through holes are formed on the peripheral surface of the strainer 67, and the pump casing 6
A suction port 65a is provided at the center of the bottom surface of the nozzle 5.

In the submersible pump having such a structure, when the impeller 66 is rotated by the driving of the motor 62, the impeller 66 passes through the through hole provided in the peripheral surface of the strainer 67 and the suction port 65a of the pump casing 65. The fluid is sucked into the pump casing 65. The fluid sucked into the pump casing 65 flows upward in the flow passage 61 a provided in the head cover 61 along the vertical direction. A hose coupling 68 to which an end of a hose (not shown) is attached is attached to the discharge port provided at the upper end of the flow passage 61a, and the fluid flowing upward in the flow passage 61a is It is discharged through the discharge port into the hose attached by the hose coupling 68.

[0004]

The strainer 67 that covers the pump casing 65 in which the impeller 66 is housed is usually provided with a tapping screw 69.
5 can be attached. That is, a plurality of cylindrical mounting portions 65b are provided on the outer peripheral surface of the pump casing 65 at regular intervals in the circumferential direction, and each mounting portion 65b has an outer peripheral edge portion of the strainer 67. Are attached to each other, and tapping screws 69, which are inserted from below into the through holes provided in the strainer 67, are screwed into the respective mounting portions 65b, whereby the strainer 67 is attached to the pump casing 65.

As described above, in the structure in which the strainer 67 is attached to the pump casing 65 by the plurality of tapping screws 69, the plurality of tapping screws 69 must be screwed into the respective attachment portions 65, which is troublesome. There's a problem. Further, since foreign matters such as fibrous substances are likely to be clogged in the through holes of the strainer 67, the clogged foreign matters need to be removed. In this case, the strainer 67 must be removed from the pump casing 65. To remove the strainer 67,
It is necessary to loosen and remove the plurality of tapping screws 69, respectively, and after removing the foreign matter, it is necessary to tighten the tapping screws again and attach the strainer 67 to the pump casing, which is troublesome. There's a problem.

The present invention is intended to solve such a problem, and an object thereof is to provide a submersible pump in which the pump casing and the strainer can be easily attached and detached, and the assembling work and the maintenance work can be easily carried out. It is in.

[0007]

The submersible pump of the present invention comprises:
An impeller placed inside the pump casing is attached to the lower end of the rotor shaft that passes through the shaft center of the motor.The rotation of this impeller causes the fluid flowing into the pump casing to be discharged upward. In such a submersible pump, the peripheral surface part and the bottom surface part of the pump casing are covered by the peripheral surface part and the bottom surface part of the strainer, and the bottom surface part of the pump casing and the bottom surface part of the strainer are either It is characterized by being attached by a pin provided on one side and a pin insertion hole provided on the other side so that the pin is inserted and supported in a fitted state by an interference fit.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an example of an embodiment of the submersible pump of the present invention.

This submersible pump has a frusto-conical head cover 10 having a slightly smaller diameter toward the upper side, a motor 20 disposed inside the head cover 10, and a pump casing 35 provided below the motor 20. And have.

The motor 20 has a cylindrical stator casing 21 and a stator 22 having a hollow axial center portion, which is concentrically arranged in the stator casing 21.
And The stator 22 is fixed to the inner peripheral surface of the stator casing 21. A rotor 23 is rotatably fitted in a hollow shaft center portion of the stator 22 in a concentric state. At the center of the rotor 23,
The rotor shaft 24 is inserted, and the upper end and the lower end of the rotor shaft 24 extend above and below the rotor 23, respectively.

The stator casing 21 has an upper end surface 21.
a is in a closed state, and a boss portion 21c projecting downward in a cylindrical shape is provided in the center portion thereof. The upper end of the rotor shaft 24 is inserted into the boss 21c, and the upper end of the rotor shaft 24 inserted into the boss 21c is rotatably supported by the bearing 25.

The upper end surface 21a of the stator casing 21
A condenser 21f is installed in the. Further, the upper end surface 21a of the stator casing 21 is provided with a cable insertion hole 21k through which a power feeding cable 44 for the motor 20 is inserted and a screw hole 21h for attaching a ground wire to the motor 20.

The lower end surface of the stator casing 21 is open, and the aluminum bracket 29 is butted to close it. The bracket 29 has a diameter slightly larger than that of the stator casing 21, and the outer peripheral portion thereof extends horizontally outside the stator casing 21 over the entire circumference. On the outer peripheral portion of the bracket 29, one discharge opening 29b is provided. A plastic head cover 10 covering the motor 20 is butted against the outer peripheral portion of the bracket 29, and the head cover 10 is fixed by bolts 12.

Inside the head cover 10, there is provided a flow path 13 extending linearly upward from the discharge opening 29b of the bracket 29. The flow path 13 is the head cover 1
0 is connected to the discharge port 14 provided in the upper part, and a screw groove 14a is provided on the outer peripheral surface of the discharge port 14.
A hose coupling 43 is abutted on the upper end surface of the discharge port 14 via a packing 42, and the hose coupling 43 is discharged by a nut member 41 screwed to a thread groove 14 a of the discharge port 14. It is attached to 14. The end of the hose is attached to the hose coupling 43.

An upper end surface of the head cover 10 is flat, and a handle portion 15 is provided on the flat upper end surface so as to project upward. Further, a cable mounting seat 16 is provided at a centrally symmetric position with the grip portion 15 sandwiched between the discharge port 14 on the upper end surface of the head cover 10 and in a state of protruding upward. An end portion of a cable 44 for supplying power to the condenser 21f provided on the upper end surface 21a of the stator casing 21 and the motor 20 is attached to the cable attachment seat 16.

At the upper end of the head cover 10, there is provided a partition wall 17 which projects downward from the upper end surface in a cylindrical shape. The partition wall portion 17 surrounds the condenser 21f provided on the upper end surface 21a of the stator casing 21, and is pressed against the outer peripheral edge portion of the upper end surface 21a of the stator casing 21 in a watertight state.

A cylindrical boss portion 29a protruding upward is provided at the center of the bracket 29, and the rotor shaft 24 for inserting the axial center portion of the motor 20 is inserted through the boss portion 29a. There is. Rotor shaft 24
Is rotatably supported by a bearing 26 provided in a boss portion 29a of the bracket 29, and a lower end portion thereof extends below the bracket 29.

Inside the boss portion 29a, below the bearing 26, an annular upper oil seal 27 and lower oil seal 28 are provided side by side in the vertical direction.
The rotor shaft 24, which is inserted through the boss portion 29a of the bracket 29, is inserted through the axial center portions of the annular upper oil seal 27 and the lower oil seal 28, and is water-tightly pressed against the outer peripheral surface of the rotor shaft 24. The rotor shaft 24 is axially sealed by the upper oil seal 27 and the lower oil seal 28.

An impeller 31 is attached to the lower end of the rotor shaft 24 extending downward from the bracket 29. The impeller 31 is arranged in a pump casing 35 attached to the lower side of the bracket 29.
The pump casing 35 is in a state of being abutted with the lower end portion of the head cover 10 fitted to the bracket 29 via a rubber band 36. The pump casing 35 is covered by a cylindrical strainer 34 on its peripheral surface and bottom surface except for the upper end.

FIG. 3 is a sectional view of the pump casing 35 and the strainer 34 in a disassembled state.
The pump casing 35 has a cylindrical peripheral surface portion 35a having an open top surface, and a bottom surface portion 35b that covers a lower end surface of the peripheral surface portion 35a, and the suction port 32 is provided in the bottom surface portion 35b.
Is provided. Peripheral surface portion 35 of pump casing 35
In a, the four mounting portions 3 are provided at equal intervals in the circumferential direction.
5c is provided on the outer peripheral surface. Each attachment portion 35c is provided with a pin insertion hole 35d whose bottom surface is open vertically.

The bottom surface portion 35b of the pump casing 35 is provided with a partition wall portion 35e which is spaced apart from the peripheral surface portion 35a and has an appropriate length in the circumferential direction, and the partition wall portion 35e and the peripheral surface portion 35a. A flow portion 33 is formed between the two. The pump casing 35 is integrally formed of plastic.

The strainer 34 is a pump casing 3
5 has a cylindrical peripheral surface portion 34b that covers the peripheral surface portion 35a and a bottom surface portion 34c that covers the lower end surface of the peripheral surface portion 34b, and the peripheral surface portion 34b has a large number of elongated holes 34a extending in the vertical direction ( 1) are provided at equal intervals in the circumferential direction. The peripheral surface portion 34b and the bottom surface portion 34c are integrally formed of plastic. Bottom part 3
4c is provided with four pins 34d extending vertically upward at equal intervals in the circumferential direction and at equal intervals in the circumferential direction. Each pin 34d is formed of plastic integrally with the bottom surface portion 34c, and faces each pin insertion hole 35d so as to be inserted into each pin insertion hole 35d provided in each mounting portion 35c of the pump casing 35. Are arranged.

Each pin 34 provided on the strainer 34
d has an outer diameter slightly larger than the inner diameter of each pin insertion hole 35d provided in each mounting portion 35c of the pump casing 35, and each pin 34d is inserted into each pin insertion hole 35d. , Each pin insertion hole 35d by interference fit
It is supported in a fitted state.

In the submersible pump having such a structure, when the rotor shaft 24 is rotated by the rotation of the rotor 23 of the motor 20, the impeller 32 in the pump casing 35 is rotated and the elongated holes 34 of the strainer 34 are rotated.
The fluid flows into the pump casing 35 through a and the suction port 32 provided in the bottom surface portion 35b of the pump casing 35.

The fluid flowing into the pump casing 35 becomes a vortex due to the centrifugal force generated by the rotation of the impeller 31, passes through the flow passage portion 33 of the pump casing 35, and flows into the flow passage 13 provided in the head cover 10. . Then, the fluid flowing into the flow path 13 flows upward through the flow path 13 and is discharged from the discharge port 14 provided at the upper end of the flow path 13. The outlet 14 has a hose coupling 43.
The end of the hose is connected by the
The fluid discharged from the discharge port 14 is supplied to a predetermined position by the hose and discharged from the tip of the hose.

The strainer 34 is attached to the pump casing 35.
When mounting the pump casing 35 on the pump casing 35, the pins 34d provided on the strainer 34 are attached to the pin insertion holes 3 of the pump casing 35.
You just have to press it firmly into 5d. The pins 34d inserted into the pin insertion holes 35d are supported in the pin insertion holes 35d in a fitted state in which they are prevented from coming off by interference fit. This allows the strainer 34
Is attached to the pump casing 35. Further, when the strainer 34 is removed from the pump casing 35 for maintenance or the like, if the strainer 34 is strongly pulled in the direction away from the pump casing 35,
Each pin 34d is pulled out from the pin insertion hole 35d, and the strainer 34 is removed from the pump casing 35.

It should be noted that the strainer 3 is so constructed that the strainer 34 can be easily removed from the pump casing 35.
You may form a protrusion in the suitable place of 4. In this case, since the fingers can be hooked on the protrusion formed on the strainer 34, the strainer 34 can be easily separated from the pump casing 35.

[0029]

As described above, in the submersible pump of the present invention, since the strainer and the pump casing are mounted by the interference fit between the pin and the pin insertion hole, the strainer is attached to the pump casing. It can be easily attached and removed.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an example of an embodiment of a submersible pump of the present invention.

FIG. 2 is an enlarged vertical sectional view showing the submersible pump.

FIG. 3 is a cross-sectional view showing an exploded view of a pump casing and a strainer of the submersible pump.

FIG. 4 is a partially cutaway front view showing an example of a conventional submersible pump.

[Explanation of symbols]

 10 Head Cover 12 Bolt 13 Flow Path 14 Discharge Port 15 Handle 16 Cable Mounting Seat 17 Partition 20 Motor 21 Stator Casing 22 Stator 23 Rotor 24 Rotor Shaft 25 Bearing 26 Bearing 27 Upper Oil Seal 28 Lower Oil Seal 29 Bracket 31 Impeller 32 Suction port 34 Strainer 34d Pin 35 Pump casing 35c Mounting part 35d Pin insertion hole

Claims (1)

[Claims] 1. An impeller arranged in a pump casing is attached to a lower end portion of a rotor shaft which is inserted through a shaft center portion of a motor, and a fluid flowing into the pump casing is rotated by the rotation of the impeller. , A submersible pump that discharges upward, wherein the peripheral surface portion and the bottom surface portion of the pump casing are covered by the peripheral surface portion and the bottom surface portion of the strainer, and the bottom surface portion of the pump casing and the bottom surface portion of the strainer And
A submersible pump, characterized in that it is attached by a pin provided on either one and a pin insertion hole provided on the other so that the pin is inserted and supported in a fitted state by an interference fit.