JP3655485B2 - Pump device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pump device, and more particularly to a pump device suitable for a dishwasher.
[0002]
[Prior art]
As a conventional pump device, there is one having a structure in which pump parts are assembled to a single motor. Such a conventional pump device is used for a self-priming pump built in a washing machine. Such a self-priming pump is disclosed in, for example, Japanese Patent Laid-Open Nos. 8-135590 and 10-196582. Moreover, there exists a pump apparatus currently used for the dishwasher as a conventional pump apparatus.
[0003]
[Problems to be solved by the invention]
In the self-priming pump device described above, the motor and the pump are separate parts, and the motor is built in and integrated with the pump case, so the oil seal holding member and the motor output shaft are aligned. Is difficult. Insufficient center alignment has the disadvantages of generating noise and shortening the seal life. Further, since separate parts such as a mounting plate are required for holding the motor, the number of assembling steps is increased and the cost is increased. In addition, a fan for cooling may be required separately, which tends to increase costs.
[0004]
The pump device used in the above-described dishwasher has different characteristics at 50/60 Hz because an induction motor is used as the motor. That is, since the rotational speed of the motor is as low as 3000/3600 rpm at 50/60 Hz, the pump efficiency is poor and the pump becomes large. Moreover, because of the induction motor, the efficiency is low and the heat generation is large. Furthermore, a cooling fan is required.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a pump device that is less susceptible to noise, can improve the durability of components, and can suppress heat generation in a motor unit.
[0006]
[Means for Solving the Problems]
In view of the above-described object, in the pump of the present invention, an impeller is provided on the output shaft of the motor, and in the pump device that feeds fluid by rotationally driving the impeller, one of the casings constituting the pump portion of the pump device. And a bearing support portion that supports a bearing device that rotatably supports the output shaft and a stator support portion that supports the stator core. The stator support portion has an impeller chamber on the opposite side of the stator core via a casing. Adjacent to each other. This facilitates securing concentricity between the output shaft of the motor and each component such as a bearing device and a stator core attached to the output shaft. Further, the heat generated from the stator core can be cooled by the fluid in the impeller chamber.
[0007]
In the pump device of the present invention , the bearing support portion and the stator support portion are disposed to face each other in a through hole provided in the center of the stator core, and the stator support portion supports the inner wall at the center of the stator core. Is provided. Thereby, since a stator support part is substituted with a pump side casing, the number of parts is reduced and an inexpensive pump is attained. Further, since the bearing support portion and the stator support portion are disposed in the through hole at the center of the stator core, the assembly is facilitated.
[0008]
In another aspect of the invention, the impeller has a shape in which part of the impeller enters a space formed by the bearing support portion and the stator support portion and agitates the fluid entering the space of the impeller chamber. Thereby, the cooling effect is enhanced.
[0009]
In another aspect of the invention, a rotor yoke provided with fan blades is disposed outside the stator core in the axial direction . Thereby, the heat generation of the stator core can be cooled by both water cooling and air cooling.
[0010]
In another aspect of the invention, a rotor yoke provided with a magnet is disposed outside the stator core in the axial direction, and a stirring member made of a magnetic material is provided in the impeller chamber so as to face the magnet. Thereby, the water cooling effect is enhanced.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the pump device of the present invention will be described with reference to FIGS. 1 is a longitudinal sectional view of the pump device of the present invention, FIG. 2 is a front view, FIG. 3 is a left side view, FIG. 4 is a right side view, and FIG. 5 is a partial schematic view seen from the direction of arrow A in FIG. 6 is a connection diagram of the motor unit of the pump device.
[0012]
The pump device according to the present invention is not a structure in which a pump and a motor composed of separate parts are assembled as in the prior art, but is characterized in that the pump and the motor are integrated and the motor has a water cooling structure. .
[0013]
The pump device of the present invention is a dishwasher pump device in the illustrated example. The pump unit of the pump device includes pump-side casings 1 and 2 as first and second pump-side casings, a separation wall 3 disposed between the pump-side casings 1 and 2, and first and second impellers. The resin impellers 4 and 5 and the rubber oil seal 6 as a seal member constitute a circulating water pump part and a drain pump part.
[0014]
The circulating water pump part surrounded by the pump side casing 1 and the separation wall 3 is formed by the water inlet 7 formed by the inner wall of the pump side casing 1, the inner wall of the pump side casing 1 following the water inlet 7 and the separation wall 3. The impeller chamber 8 in which the impeller 4 is disposed and the spiral discharge portion 9 integrally formed with the pump-side casing 1 so as to communicate with the impeller chamber 8 are provided. The impeller 4 includes an attachment portion 4a having a hole through which the shaft 16 is inserted, a blade portion 4b, and an annular rib 4c formed integrally with the blade portion 4b. The separation wall 3 is formed with a hole 3a through which the mounting portion 5a of the impeller 5 passes and an annular groove 3b that forms a labyrinth structure when the annular rib 4c of the impeller 4 enters.
[0015]
An impeller chamber 10 in which the impeller 5 is disposed is formed in the drainage pump portion, surrounded by the pump-side casing 2 and the separation wall 3. Further, the drainage pump section includes a water inlet 23 and a water outlet 24 that are integrally formed with the pump-side casing 2 so as to communicate with the impeller chamber 10. The impeller 5 has a hole through which the shaft 16 is inserted, and includes an attachment portion 5a docked with the attachment portion 4a of the impeller 4, a blade portion 5b, and a protrusion 5c formed integrally with the blade portion 5b.
[0016]
The motor unit of the pump device includes a cylindrical motor-side casing 11, radial bearings (ball bearings, sintered bearings, etc.) 12, 13 as a bearing device, a rotor magnet 14, a rotor yoke 15, and an output of the motor. The shaft 16 is a shaft, a stator core 17, a bobbin 18, a coil 19, a substrate 20, a Hall IC 21, and a lead wire 22. The rotor yoke 15 is formed in a cup shape, and a rotor magnet 14 is fixed to the inner periphery. The rotor yoke 15 is a backup yoke for the magnet 14, and an iron magnetic material (for example, a low carbon steel with good drawability) is used. Fan blades 15a are cut and raised on the side of the cup.
[0017]
The second pump-side casing 2 includes an annular groove 2a into which the annular protrusion 1a of the first motor-side casing 1 is fitted, a large-diameter cylindrical extension 2b extending from the annular groove 2a, and a large-diameter cylindrical shape. Medium diameter cylindrical extension 2c having a diameter smaller than the diameter of extension 2b and extending outward from large diameter cylindrical extension 2b, and smaller than the diameter of medium diameter cylindrical extension 2c A small-diameter cylindrical extension 2d that has a diameter and is folded back from the medium-diameter cylindrical extension 2c and further extends inward.
[0018]
Regarding the structure of the second pump-side casing 2, in other words, a small-diameter cylindrical extension 2 d as a bearing support in a through hole provided in the center of the stator core 17 and a stator support that supports the inner wall at the center of the stator core 17. The middle-diameter cylindrical extending portion 2c is disposed so as to face each other. An impeller chamber 10A connected to the impeller chamber 10 and into which the protrusion 5c of the impeller 5 enters is inserted into a space formed by the medium-diameter cylindrical extension 2c and the small-diameter cylindrical extension 2d of the second pump-side casing 2. Is formed.
[0019]
The pump-side casings 1 and 2 and the motor-side casing 11 are fastened with screws 25 and integrated. Further, as shown in FIG. 5, a lead wire through hole 11 c slightly narrower than the diameter of the lead wire 22 is formed in the motor side casing 11. The lead wire through hole 11 c holds the lead wire 22 when tightened with the screw 25, and ensures the pulling strength of the lead wire 22. Further, a ventilation hole 11 a is formed in the bottom wall (right side in FIG. 1) of the motor-side casing 11.
[0020]
Next, the detailed structure and assembly method of this pump apparatus will be described.
[0021]
First, each component which forms an outer rotor type motor is attached to the medium-diameter cylindrical extension 2c and the small-diameter cylindrical extension 2d of the pump-side casing 2. That is, on the outer wall of the medium-diameter cylindrical extension 2 c of the pump-side casing 2, there is a stator core assembly (stator core 17, bobbin 18, coil 19 wound around the bobbin 18, and substrate 20 attached to the bobbin 19. The Hall IC 21 and the lead wire 22 connected to the substrate 20 are inserted first from the lead wire 22 side, and the stator core 17 and the medium-diameter cylindrical extension 2c are fixed by a joining means such as ultrasonic welding. .
[0022]
Next, the oil seal 6 is fixed to one end of the small-diameter cylindrical extension 2d, that is, the inner wall of the tip by a joining method such as press fitting. Next, the radial bearings 12 and 13 are fixed to the intermediate portion and the other end portion of the small-diameter cylindrical extension portion 2d by a joining method such as press fitting as a bearing device. Thereafter, the shaft 16 is inserted into the oil seal 6 and the radial bearings 12 and 13 so as to extend to the vicinity of the water inlet 7. A rotor set (consisting of a rotor yoke 15 to which a magnet 14 is attached) is inserted and fixed to one end 16a of the shaft 16. Further, the impeller 5 and then the separation wall 3 and the impeller 4 are inserted from the end 16b opposite to the insertion of the rotor set, and fixed by press-fitting or the like. In addition, the engagement between the impeller 4 and the impeller 5 is coupled so as to be movable in the axial direction.
[0023]
The motor having the above structure constitutes a three-phase DC brushless motor. As shown in the connection diagram of FIG. 6, the coil 19 is composed of coils A, B, and C that are star-connected and supplied with a three-phase voltage. The IC 21 includes three Hall elements HA, HB, and HC that are arranged between the coils A, B, and C and supplied with a DC power source (for example, 5 volts).
[0024]
One end portion 16a of the shaft 16 to which the rotor yoke 15 is fixed is formed with a knurl for enhancing press-fit coupling. The other end 16b of the shaft 16 to which the impeller 4 is fixed is formed with a serration for strengthening the press-fitting coupling. The motor side casing 11 is shared as a cover for the rotor portion of the outer rotor type motor.
[0025]
In the above structure, the oil seal 6, the radial bearings 12 and 13, and the stator core 17 are fixed and held in the extending portions 2 c and 2 d of the pump side casing 2, so that the concentricity of each component can be secured. It becomes easy.
[0026]
Next, the operation of the pump device having the above structure will be described.
[0027]
First, in the dishwashing mode of the dishwasher, a three-phase voltage is supplied to the lead wires 22 to start the motor, and the shaft 16 serving as the motor output shaft rotates counterclockwise as viewed from FIG. Driven to rotate. Thereby, the impeller 4 also rotates counterclockwise. At the same time, the impeller 5 also rotates counterclockwise, but there is no leakage to the drainage side due to the reverse rotation to that during drainage.
[0028]
Due to the rotation of the impeller 4, dishwashing water is sucked from the water inlet 7 and supplied to the impeller chamber 8. At this time, since the pressure in the impeller chamber 8 increases, there is a risk of water leakage to the impeller chamber 10 side. However, the labyrinth structure by the annular rib 4c of the impeller 4 and the annular groove of the separation wall 3 minimizes water leakage. To work. Next, the dishwashing water in the impeller chamber 8 is sent to the inlet 9 a of the spiral discharge portion 9 by the rotation of the blade portion 4 b of the impeller 4. The sent dishwashing water is ejected from the outlet 9b of the spiral discharge portion 9 to the outside of the pump device, poured into the tableware, and the tableware is washed. The dishwashing water after washing is sucked in again from the water inlet 7 and is used cyclically.
[0029]
When the dishwasher is in the dishwashing mode, heat from the stator core 17 fixed to the medium-diameter cylindrical extension 2c of the motor-side casing 2 is ventilated by the rotation of the fan blades 15a of the rotor yoke 15. It is air-cooled by the wind entering from the hole 11a. The stator core 17 is also cooled by hot water or cold water entering the impeller chamber 10A. However, in the case of warm water, the cooling effect is small.
[0030]
Next, when the dishwashing operation for a certain period of time is completed, the lead wire 22 is subsequently supplied with a three-phase voltage having a reverse order to the three-phase voltage during the dishwashing operation, so that the motor rotates reversely. Driven by. When the motor rotates in the reverse direction, the shaft 16 serving as the output shaft of the motor is driven to rotate clockwise as viewed from FIG. Thereby, the impeller 5 also rotates clockwise. At the same time, the impeller 4 also rotates clockwise. However, the rotation direction is opposite to the spiral direction of the spiral discharge section 9, and the pump efficiency is extremely deteriorated.
[0031]
Washed water collected at the bottom inside the dishwasher by the rotation of the impeller 5 is sucked from the water inlet 23 and supplied to the impeller chamber 10 and the impeller chamber 10A. Next, the water in the impeller chamber 10 is sent to the water outlet 24 by the rotation of the blade portion 5b of the impeller 5 and drained outside the dishwasher.
[0032]
Heat generated from the stator core 17 fixed to the medium-diameter cylindrical extension 2c of the motor-side casing 2 is water-cooled by passing water into the impeller chamber 10A in addition to air cooling due to rotation of the fan blades 15a of the rotor yoke 15. The At this time, the water in the impeller chamber 10A is agitated by the rotation of the protrusion 5c of the impeller 5 and the cooling effect is enhanced.
[0033]
The configuration and operation described above have the following effects.
1) Since the oil seal, the bearing device, and the stator core are fixed and held in the same pump-side casing, it is easy to secure the concentricity of each component.
2) As a substitute for the motor mounting plate in the conventional structure, the pump-side casing is used in common, so the number of parts is reduced and an inexpensive pump is possible.
3) The total assembly including the motor part is facilitated, and the accuracy is easily obtained.
4) Since the outer rotor type motor is used, the magnet becomes large, and the required magnetic flux can be secured by using an inexpensive ferrite magnet.
5) Since an outer rotor type motor is used, the stator core is small and winding is easy, and material costs and winding costs are reduced.
6) Since a brushless DC motor is used, the 50/60 Hz characteristics are the same.
7) Since a brushless DC motor is used, the number of rotations of the motor can be easily increased, and the motor can be used in a region where the number of rotations is high. In addition, the efficiency of the motor can be increased.
8) Since the side surface of the outer rotor is used as a fan, a separate cooling fan is not required.
9) Since a brushless motor is used, efficiency is high and heat generation is suppressed.
[0034]
As described above, the embodiment of the present invention has been described, but the present invention is not limited to this, and various modifications and applications are possible. For example, in the above-described embodiment, the dishwasher pump device is used, but the present invention is not limited to this and can be applied to general pumps. Moreover, you may apply to the pump apparatus which does not have two impellers but has only one impeller.
[0035]
Alternatively, the rotor yoke portion for fixing the magnet 14 may be made of an iron magnetic material, the fan blades 15a may be made of resin instead of being cut and raised, and the rotor yoke portion and the shaft 16 may be fixed by insert molding.
[0036]
In another embodiment, as shown in FIG. 7, the magnet 26 is fixed to the rotor yoke 15 outside the stator core 17, and the stirring member 27 made of a magnetic material is disposed so as to face the magnet 26 in the impeller chamber 10A. May be provided. The pump device shown in FIG. 7 has basically the same structure as the pump device shown in FIGS. 1 to 6, and the same parts are denoted by the same reference numerals and the description thereof is omitted or simplified. This pump device is different from the pump device shown in FIGS. 1 to 6 in that the liquid stirring structure, the air-side hole 11a is not formed in the motor-side casing 11, and the fan blade 15a is not formed in the rotor yoke 15. Different.
[0037]
The stirring structure of the pump device shown in FIG. 7 has a recess 28 formed in the impeller chamber 10A at the connecting portion of the middle-diameter cylindrical extension 2c and the small-diameter cylindrical extension 2d of the motor-side casing 2, and the stirring member 27 It is set as the structure which makes a cross-sectional bullet shape and arrange | positions so that the front-end | tip may contact the recessed part 28. With this configuration, when the magnet 26 that rotates integrally with the rotor yoke 15 rotates, the stirring member 27 also rotates accordingly, and the water in the impeller chamber 10A is stirred.
[0038]
Further, the configuration in which the stator core 17 and the radial bearings 12 and 13 are supported by the pump-side casing 2 is not limited to a three-phase DC brushless motor, but other brushless motors such as an AC synchronous motor and a stepping motor, a motor with a DC brush, etc. This can also be applied to a motor with a brush. Moreover, each stirring structure and fan blade 15a described above can also be applied to various motors.
[0039]
【The invention's effect】
In each pump device of the present invention, since the oil seal, the bearing, and the stator core are fixed and held in the same pump casing, concentricity of each component can be easily ensured. Further, since the pump casing is used in common as a substitute for the motor mounting plate, the number of parts is reduced and an inexpensive pump can be realized. In addition, including the motor unit, total assembly is facilitated, and accuracy is also easily achieved. Further, by devising the shape of the pump-side casing, the stator core can be cooled by utilizing a part of the liquid in the pump device.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of a pump device of the present invention, and is a sectional view taken along line II in FIG.
FIG. 2 is a front view of the pump device shown in FIG.
FIG. 3 is a left side view of the pump device shown in FIG.
4 is a right side view of the pump device shown in FIG. 2. FIG.
FIG. 5 is a partial schematic view seen from an arrow A in FIG. 4;
6 is a connection diagram of a motor unit of the pump device shown in FIG. 1. FIG.
FIG. 7 is a longitudinal sectional view showing another embodiment of the pump device of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pump side casing 2 Pump side casing 2c Medium diameter cylindrical extension part (stator support part)
2d Small diameter cylindrical extension (bearing support)
3 Separation wall 4 Impeller 5 Impeller 5c Protrusion 10A Impeller chamber 12, 13 Radial bearing (bearing device)
15 Rotor yoke 15a Fan blade 16 Shaft (motor output shaft)
17 Stator core 26 Magnet 27 Stirring member

Claims (4)

In the pump device that includes an impeller on the output shaft of the motor and sends out fluid by rotationally driving the impeller,
A bearing support portion that supports a bearing device that rotatably supports the output shaft at a part of a casing that constitutes a pump portion of the pump device, and a stator support portion that supports a stator core;
An impeller chamber is provided adjacent to the stator support portion on the opposite side of the stator core via the casing ,
In the through hole provided in the center of the stator core, the bearing support portion and the stator support portion are arranged to face each other,
The said stator support part supports the inner wall of the center of the said stator core, The pump apparatus characterized by the above-mentioned.   In the pump device that includes an impeller on the output shaft of the motor and sends out fluid by rotationally driving the impeller,
  A bearing support portion that supports a bearing device that rotatably supports the output shaft at a part of a casing that constitutes a pump portion of the pump device, and a stator support portion that supports a stator core;
  An impeller chamber is provided adjacent to the stator support portion on the opposite side of the stator core via the casing,
  A part of the impeller enters a space formed by the bearing support portion and the stator support portion, and the pump is configured to agitate the fluid entering the space of the impeller chamber. apparatus.   In the pump device in which an impeller is provided on the output shaft of the motor, and fluid is sent by rotationally driving the impeller,
  A bearing support portion that supports a bearing device that rotatably supports the output shaft at a part of a casing that constitutes a pump portion of the pump device, and a stator support portion that supports a stator core;
  An impeller chamber is provided adjacent to the stator support portion on the opposite side of the stator core via the casing,
  A pump device comprising a rotor yoke provided with fan blades on an outer side in the axial direction of the stator core.   In the pump device in which an impeller is provided on the output shaft of the motor, and fluid is sent by rotationally driving the impeller,
  A bearing support portion that supports a bearing device that rotatably supports the output shaft at a part of a casing that constitutes a pump portion of the pump device, and a stator support portion that supports a stator core;
  An impeller chamber is provided adjacent to the stator support portion on the opposite side of the stator core via the casing,
  A pump device characterized in that a rotor yoke provided with a magnet is disposed outside the stator core in the axial direction, and a stirring member made of a magnetic material is provided in the impeller chamber so as to face the magnet.

Images