JP4458792B2 - Self-priming pump - Google Patents

Description

  The present invention relates to a self-priming pump.

  Conventionally, various self-priming pumps for sucking water and sending it to a predetermined place have been proposed (Patent Document 1).

  In such a self-priming pump, a first casing having an inlet for sucking water and an outlet for discharging water, a second casing, and a space between the first casing and the second casing are provided. There is a self-priming pump having a partition plate provided and an impeller disposed inside the second casing.

This self-priming pump has a structure in which an impeller is rotated by a motor to suck water from the inlet and discharge it from the outlet.
JP2003-114052

  In the above self-priming pump, a mouth portion is opened in the partition plate, and a part of the impeller is inserted into the opened mouth portion. Since the first casing, the second casing, and the partition plate are made of synthetic resin, a gap between the inner diameter of the mouth portion of the partition plate and the outer diameter of the inserted impeller is required to be about 1 mm or more in diameter. . For this reason, there is a problem that the water pumping performance and efficiency of the self-priming pump deteriorate due to water leaking from the gap.

  Therefore, the present invention provides a self-priming pump that can reduce the gap between the inner diameter of the mouth portion of the partition plate and the outer diameter of the impeller and improve the pumping performance and the pump efficiency.

The invention according to claim 1 is a first casing made of synthetic resin having an inlet and an outlet for fluid, a second casing made of synthetic resin, a mouse that partitions the first casing and the second casing and fluid flows. An impeller formed of a partition plate having an opening, a circular plate, a plurality of blades, and a ring plate provided on the opposite side of the circular plate, and disposed in a pump chamber inside the second casing; A self-priming pump that rotates the impeller by the motor, sucks fluid from the inlet, and discharges the fluid from the outlet . A stepped portion is provided on the inner side, and a cylindrical protruding portion protruding in the axial direction is formed on the inner diameter side of the ring plate, and when the partition plate is fixed to the second casing, an edge between the step portion and the partition plate is formed. Gap between Provided, the protruding portion is inserted into the mouth portion, by performing an adjustment so as not to contact the projection of the ring plate to the mouth portion of the partition plate, it is characterized in that so as to fix a plurality of screws self This is a suction pump.

  The invention according to claim 2 is that the motor is a molded motor, wherein a ring-shaped stator is molded by at least a mold resin to form a ring-shaped frame, is cylindrical from the pump chamber, and has a bottom. And the can is fitted into the inner periphery of the ring-shaped frame, the rotor of the motor is rotatably disposed inside the can, and the rotating shaft of the rotor is connected to the pump chamber. The self-priming pump according to claim 1, wherein the impeller is fixed so as to protrude.

  According to a third aspect of the present invention, a bearing support portion is provided between the pump chamber and the inside of the can, and the water inside the can is circulated through the bearing support portion, and bubbles accumulated in the can A plurality of flow through holes for removing the shaft, a shaft through hole through which the rotating shaft passes, a pair of bearings for rotatably supporting the rotor is provided, and one of the pair of bearings has one bearing. 3. The self-priming pump according to claim 2, wherein the can is fixed to the bottomed portion of the can and the other bearing is fixed to the inner peripheral side of the shaft through hole.

  The invention according to claim 4 is the self-priming pump according to at least one of claims 1 to 3, wherein the motor is a brushless DC motor.

  In the self-priming pump of the invention according to claim 1, since the partition plate is fixed to the second casing with screws, the relationship between the impeller and the mouse portion is accurately determined, and the inner diameter of the mouse portion and the impeller The gap with the outer diameter can be made smaller than before. Therefore, pumping performance and pump efficiency can be improved.

  In the self-priming pump of the invention according to claim 2, since the bottomed can protrudes from the pump chamber inside the second casing, and the rotor of the motor is rotatably arranged inside the can, the pump chamber Even if water leaks from 20 through the rotary shaft of the pump, water does not leak out from this cylindrical portion. Therefore, it has a sufficient waterproof effect.

  In a self-priming pump according to a third aspect of the present invention, a bearing support part between the pump chamber and the can is provided, and a shaft through hole through which the rotating shaft passes is provided in the bearing support part, and the rotation A pair of bearings for rotatably supporting the child is provided, one of the pair of bearings is fixed to the bottomed portion of the can, and the other bearing is fixed to the inner peripheral side of the shaft through hole. For this reason, the rotor can be rotatably arranged inside the can.

  In the self-priming pump of the invention according to claim 4, since the motor is a brushless DC motor, the pump can be accurately controlled.

  Hereinafter, a self-priming pump 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

  1 is a longitudinal sectional view of the self-priming pump 10, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a sectional view taken along line BB in FIG.

(1) Configuration of Self-Priming Pump 10 The casing of the self-priming pump 10 includes a first casing 12 made of synthetic resin and a second casing 14 made of synthetic resin. On the left side of the lower portion of the first casing 12, there is an inlet 16 for sucking water, and an inlet pipe 18 extends from the inlet 16 to the center of the first casing 12. A first tank chamber 13 in which exhaled water is stored is provided at the upper part of the first casing 12. A water outlet 78 is provided on the left side of the lower portion of the first tank chamber 13. The first tank chamber 13 and the inlet pipe 18 are partitioned so that there is no water flow.

  A packing 20 and a partition plate 22 are disposed between the first casing 12 and the second casing 14. A circular opening 24 is opened in the packing 20, and a circular mouse part 26 is opened at the position of the partition plate 22 corresponding thereto. The outer diameter of the opening 24 is formed larger than the outer diameter of the mouse part 26. The end portion of the inlet pipe 18 extends to the position of the mouse portion 26.

  The first casing 12 and the second casing 14 have flanges 82 and 84 projecting from each other, and the flanges 82 and 84 are fixed with a plurality of screws 86 so that the first casing 12 and the second casing 14 are packed. It fixes so that 20 and the partition plate 22 may be pinched | interposed.

  The lower part of the second casing 14 is provided with a pump chamber 30 in which an impeller 28 is rotatably arranged, and a second tank chamber 32 for storing expiratory water is provided above the pump chamber 30. Openings 76 are opened in the packing 20 and the partition plate 22 so that water flows between the second tank chamber 32 and the first tank chamber 13.

  In the impeller 28, a boss 36 is provided at the center of the circular plate 34, and a plurality of blades 38 are provided around the boss 36. A ring plate 40 is provided on the opposite side of the plurality of blades 38 from the circular plate 34, and an inner diameter side of the ring plate 40 projects in the axial direction to form a cylindrical projecting portion 42. The portion of the outer periphery between the adjacent blades 38 is open. Further, the protruding portion 42 is inserted into the mouth portion 26 of the partition plate 22, and a gap S <b> 1 is provided between the outer diameter of the protruding portion 42 and the inner diameter of the mouth portion 26.

  A step 44 is provided at the edge of the second casing 14, and the edge of the partition plate 22 is fitted into the step 44, and the partition 22 is fixed to the second casing 14 with screws 46 and 48. . A gap S <b> 2 is provided between the step 44 of the second casing 14 and the edge of the partition plate 22.

  A motor 50 is attached to the second casing 14.

  The motor 50 is a brushless DC motor and a molded motor, and a ring-shaped stator 52 of the motor 50 and a wiring board 54 incorporating a drive circuit of the motor 50 are molded with a molding resin to form a frame of the motor 50. 56 is formed.

  A cylindrical and bottomed can 58 extending from the second casing 14 is inserted on the inner peripheral side of the ring-shaped frame 56. A rotor 60 is disposed on the inner periphery of the can 58. A rotating shaft 62 of the rotor 60 is rotatably arranged by a pair of bearings 64 and 66, and a distal end portion of the rotating shaft 62 is fitted and fixed to the boss 36 of the impeller 28.

  A bearing 64 opposite to the output side of the rotating shaft 62 is fixed to the bottomed portion 68 of the can 58. A bearing support portion 70 that supports the bearing 66 is provided separately from the second casing 14, and the bearing support portion 70 is fixed to the base portion of the can 58 with a screw 72. A shaft through hole 74 through which the rotary shaft 62 passes is opened in the bearing support portion 70, and a cylindrical portion 75 projects from the edge portion of the shaft through hole 74 toward the motor 50. An output-side bearing 66 is fixed on the circumferential side. Further, the bearing support portion 70 is provided with a plurality of flow through holes 71 for circulating water inside the can 58 and for removing bubbles accumulated in the can 58.

  Thus, the motor 50 is a mold motor, and a bottomed can 58 is inserted into a frame 56 made of a mold resin, and the rotor 60 is rotatably arranged inside the can 58. Further, since the stator 52 and the wiring board 54 are molded, the wiring board 54 does not touch the water and fail.

  As shown in FIG. 3, the second tank chamber 32 is located above the pump chamber 30, and the water sent from the impeller 28 passes through the pump chamber 30 once and is provided in the packing 20 and the partition plate 22. The gas passes through the opening 76 and is discharged from an outlet 78 provided on the right side of the first casing 12.

  The upper surface of the second tank chamber 32 is provided with a priming inlet 80 for priming.

(2) Operational State of Self-Priming Pump 10 The operational state of the self-priming pump 10 having the above configuration will be described.

  First, exhalation water is put in advance from the second inlet 80, and the first tank chamber 13, the second tank chamber 32, the pump chamber 30, and the inlet pipe 18 are filled with water.

  When the impeller 28 is rotated by driving the motor 50, the water is sucked from the inlet 16, passes through the inlet pipe 18, passes through the inside of the projecting portion 42 of the impeller 28 inserted into the mouse portion 26, and the outer periphery of the blade 38. The pump chamber 30 reaches the second tank chamber 32 through the section. The water that reaches the second tank chamber 32 reaches the first tank chamber 13 through the opening 76 and is discharged from the outlet 78.

  Since the partition plate 22 is fixed to the second casing 14 with screws 46 and 48, the gap S1 between the outer diameter of the projecting portion 42 and the inner diameter portion of the mouse portion 26 can be reduced to 0.3 mm or less. The gap between the step 44 of the second casing 14 and the edge of the partition plate 22 can also be formed in the range of about 0.3 mm to 0.5 mm. Therefore, the amount of water leaking from the gap between the mouse portion 26 and the protruding portion 42 is very small, and the pumping performance and efficiency can be improved as compared with the conventional case. For example, the head is improved by 25%, the pumping amount is improved by 20% or more, and the pump efficiency is improved by 19% or more.

  The gaps S1 and S2 can be slightly adjusted when the partition plate 22 is fixed with screws 46 and 48. It should be noted that not only two places but also more places may be screwed.

(Example of change)
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist thereof.

  For example, although a brushless DC motor is used as the motor 50 in the above embodiment, other induction motors or synchronous motors may be used.

  The self-priming pump of the present invention can be used as a pump for feeding water and other fluids such as a home well pump, a washing machine pump, and a water heater.

It is a longitudinal section of a self-priming pump showing one embodiment of the present invention. It is the sectional view on the AA line in FIG. It is the BB sectional view taken on the line in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Self-priming pump 12 1st casing 13 1st tank chamber 14 2nd casing 16 Inlet 22 Partition plate 26 Mouse part 28 Impeller 30 Pump chamber 32 2nd tank chamber 42 Protrusion part 44 Step part 46 Screw 48 Screw 50 Motor 52 Stator 54 Wiring board 56 Frame 58 Tube part 60 Rotor 62 Rotating shaft 68 Bottomed part 76 Opening part 78 Exit

Claims (4)

A first casing made of synthetic resin having a fluid inlet and outlet;
A second casing made of synthetic resin;
A partition plate that partitions the first casing and the second casing and has an open mouth portion through which fluid flows;
An impeller formed of a circular plate, a plurality of blades, and a ring plate provided on the opposite side of the circular plate, and disposed in a pump chamber inside the second casing;
A motor for rotating the impeller;
Have
In the self-priming pump that rotates the impeller by the motor, sucks fluid from the inlet, and discharges it from the outlet,
A step is provided inside the edge of the second casing,
A cylindrical protruding portion protruding in the axial direction is formed on the inner diameter side of the ring plate,
When fixing the partition plate to the second casing, a gap is provided between the stepped portion and the edge of the partition plate, the protruding portion is inserted into the mouth portion, and a ring plate is inserted into the mouth portion of the partition plate. A self-priming pump characterized in that adjustment is made so that the protruding portion of the nozzle does not come in contact, and it is fixed with a plurality of screws .
The motor is a molded motor, and a ring-shaped stator is molded with at least a mold resin to form a ring-shaped frame,
A cylindrical and bottomed can protrudes from the pump chamber, and the can is fitted into an inner peripheral portion of the ring-shaped frame,
The rotor of the motor is rotatably arranged inside the can,
The self-priming pump according to claim 1, wherein a rotating shaft of the rotor protrudes into the pump chamber and the impeller is fixed. A bearing support is provided between the pump chamber and the interior of the can;
The bearing support portion is provided with a plurality of flow through holes for allowing water inside the can to flow and for removing bubbles accumulated in the can, and a shaft through hole through which the rotating shaft passes,
A pair of bearings for rotatably supporting the rotor is provided,
The self-priming pump according to claim 2, wherein one of the pair of bearings is fixed to a bottomed portion of the can, and the other bearing is fixed to an inner peripheral side of the shaft through hole. . The self-priming pump according to at least one of claims 1 to 3, wherein the motor is a brushless DC motor.