JP2004060620A - Reversible pump and dishwasher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a smaller, lighter, less costly and highly reliable reversible pump and a smaller, less noisy and less costly dishwasher using the pump and having superior washing performance. <P>SOLUTION: The reversible pump 1 has a pump part 2 partitioned into a normal rotation pump chamber 10 and a reverse rotation pump chamber 20. The normal rotation pump chamber 10 and the reverse rotation pump chamber 20 each have a suction port and a discharge port. A fixed shaft 51 is provided in the reverse rotation pump chamber 20. A ring stator 31 exists on the outer periphery of the fixed shaft 51, a rotor is arranged on the outer periphery of the stator 31 rotatably relative to the fixed shaft 51, and a reverse rotation impeller 25 is formed integrally with the rotor. A normal rotation impeller 15 is rotatably arranged on the fixed shaft 51 in the normal rotation pump chamber 10. The stator 31 and the rotor constitute an outer rotor type motor. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a reversible pump that absorbs and discharges water from a predetermined water intake port and a discharge port in response to normal or reverse rotation of a pump, and supplies washing water using the reversible pump to a washing tank to wash dishes. The present invention also relates to a dishwasher for draining wastewater after washing.
[0002]
[Prior art]
Conventionally, pumps used in dishwashers have the function of absorbing the washing water stored in the tank in the dishwasher, pumping it to the washing nozzle, and spraying the dishes stored in the washing tank for washing and rinsing. In order to satisfy the function of draining washing water (dirty water) contaminated by washing to the outside, one pump is provided with two types of impellers for normal rotation and reverse rotation, and its water suction port and discharge port. In some cases, the washing water is sucked into the pump and sent to the washing tank under pressure to circulate the dishwasher while washing the dishes, or the wastewater returned to the water tank is discharged outside the machine at the time of reverse rotation.
[0003]
An example of a conventional pump used in the dishwasher will be described with reference to a longitudinal sectional view of a reversible pump 100 shown in FIG. 4 (hereinafter, a reversible pump is simply referred to as a pump).
[0004]
The pump 100 shown in FIG. 4 includes a motor unit 110 that is covered with an outer shell 118 and houses an induction motor 111, and a pump unit 120 that is connected horizontally with a packing 155 therebetween to form a pump. A diversion impeller 122 and a reverse diversion impeller 122 are respectively housed in two pump chambers 121 and 131, and generate a suction action of flowing water in one of the pump chambers according to the forward and reverse operation directions of the motor 111. Sometimes, the running water sucked into the forward rotation pump chamber 121 from the forward rotation water suction port 123 by the suction operation of the forward rotation impeller 122 is discharged from the forward rotation discharge port 124, and the reverse rotation is performed by the reverse rotation impeller 132 during the reverse rotation. The running water sucked into the reverse rotation pump chamber 131 from the water suction port 133 is discharged from the reverse rotation discharge port 134 to the outside of the pump 100.
[0005]
The pump 100 having the above-mentioned horizontal pump structure is installed horizontally in a dishwasher, easily generates "air bite" during drainage operation, increases noise, and has a large amount of residual water remaining in the dishwasher, which causes sanitary problems and the like. May cause odor. Further, since the impeller diameter is limited, there is a problem that the noise is further increased when the rotation is increased to obtain the pump performance, and a problem that the compactness of the dishwasher is lacking because the pump is long and large in the lateral direction. .
[0006]
As a solution to the above problem, the pump 200 shown in the vertical cross-sectional view of FIG. 5 has a motor section 210 and a pump section 220 having two water intake ports 225 and 235 and discharge ports 226 and 236. It is comprised in.
[0007]
In the motor unit 210, a stator 211 molded with a mold resin 215 and a rotor 216 having a magnetic body 217 on its inner periphery are rotatably arranged to constitute a brushless DC motor. A pump chamber 221 for forward rotation and a pump chamber 231 for reverse rotation are formed by partitioning the inside of the casing up and down by a partition wall 240, and the motor section 210 and the pump section 220 are fastened by the oil seal 257 to ensure waterproofness, and the pump 200 is closed. Has formed.
[0008]
In the pump section 220, the forward rotation impeller 222 and the reverse rotation impeller 232 connected to the rotating shaft 218 are disposed in the forward rotation pump chamber 221 and the reverse rotation pump chamber 231, respectively, and the forward rotation water inlet 225 that opens downward. And a flow passage 245 communicating from the water inlet 225 to the forward rotation pump chamber 221 through a flowing water passage hole 241 provided in the partition wall 240 and a flowing water passage hole 234 provided in the reverse rotation impeller 232. In addition, a cylindrical guide 238 for guiding flowing water from the normal rotation water inlet 225 is provided at a peripheral portion centered on the passage hole 234 of the reverse rotation impeller 232 toward the opening of the normal rotation water intake 225. Thus, the flowing water sucked from the forward rotation water suction port 225 is prevented from flowing into the reverse rotation pump chamber 231.
[0009]
Then, the pump 200 sends the flowing water sucked from the forward rotation water suction port 225 to the forward rotation pump chamber 221 to the forward rotation discharge port 226 by the centrifugal action of the fugal blade 223 when the motor is rotating forward, and the reverse rotation pump chamber 231 when the rotation is reverse. Then, the flowing water sucked from the reverse rotation water suction port 235 is discharged from the reverse rotation discharge port 236 by the water feeding action of the Wesco blade 233.
[0010]
In the pump 200 having the above-described configuration, compared to the conventional pump 100, “air biting” at the time of drainage is reduced, drainage is improved, and the amount of remaining water is reduced. This reduces noise and reduces the risk of electric shock and leakage due to the motor section being located at the top of the pump.
[0011]
However, in the pump 200, since the motor unit 210 and the pump unit 220 have independent configurations to form the vertical pump 200, the size of the pump in the vertical direction is long, and it is difficult to reduce the size and flattening of the pump. However, the demand for downsizing and compacting of a dishwasher using this pump has not yet been sufficiently satisfied.
[0012]
Further, a forward rotation water suction port 225 and a cylindrical guide 238 for guiding flowing water are provided in the pump section 220, and the pump structure is very complicated to form the flow path and reduce noise, and the number of parts is reduced. The oil seal 257 for waterproofly sealing the gap between the motor unit 210 and the pump unit 220 causes a loss of rotation of the motor due to frictional resistance with the rotating shaft 218. There is.
[0013]
Further, at the time of the forward rotation operation, when the flowing water sucked from the water suction port 225 flows into the forward rotation pump chamber 221 through the flow path 245 in the cylindrical guide 238, there is a possibility that the flowing water also flows into the reverse rotation pump chamber 231. There is a fear that the pump characteristics may be deteriorated.
[0014]
FIG. 6 is a schematic diagram of the structure of the dishwasher 5 in which the pump 200 is built in the bottom of the apparatus (the reference numerals of the dishwasher other than the pump unit are the same as those in FIG. 2). The pump 200 cleans the washing water stored in the water tank 267. The suction and ejection to tableware is performed, and the wastewater is drained out of the machine. The installation space for the pump 200 is still required to be large.
[0015]
Therefore, the dishwasher 5 using the pump 200 is not sufficiently satisfactory in terms of downsizing, compactness, and cost reduction of the apparatus, and also has performance and noise such as cleaning ability, drainage, and operation noise. Further improvement in operability is also required.
[0016]
[Problems to be solved by the invention]
The present invention solves the above-described problems of the conventional pump. The pump structure is simplified, the size and weight of the reversible pump are reduced, and the number of parts is reduced by eliminating complicated parts, thereby enabling cost reduction. And a highly reliable pump, and has a compact structure using the reversible pump. It is intended to provide an excellent dishwasher.
[0017]
[Means for Solving the Problems]
The invention according to claim 1 is a reversible pump in which a pump section is partitioned into a forward rotation pump chamber and a reverse rotation pump chamber, wherein the forward rotation pump chamber and the reverse rotation pump chamber each have a water suction port and a discharge port. In the reverse rotation pump chamber, a fixed shaft is provided, a ring-shaped stator is provided on the outer periphery of the fixed shaft, and a rotor is arranged on the outer periphery of the stator so as to be rotatable with respect to the fixed shaft, A reverse impeller is formed integrally with the rotor, and in the forward rotation pump chamber, a forward rotation impeller is rotatably arranged on the fixed shaft, and is an outer rotor type configured by the stator and the rotor. The forward rotation impeller and the reverse rotation impeller are rotated by a motor unit.At the time of forward rotation, water is sucked into the forward rotation pump chamber from the forward rotation suction port and discharged from the forward rotation discharge port, and at the time of reverse rotation. Water is sucked into the pump chamber for reverse rotation from the suction port for reverse rotation. A reversible pump which is characterized in that to the discharge from the reverse ejection outlet.
[0018]
According to the reversible pump of the present invention, the rotor of the motor portion and the reversing impeller in the reversing pump chamber are also used, so that the motor portion is shared with the reversing pump chamber portion, Eliminating the need for an independent motor unit greatly reduces the size and weight of the pump, and simplifies the structure of the pump unit. Can be In addition, the pump characteristics can be improved by simplifying the flow path, integrating the rotor and the impeller, and eliminating the need for an oil seal for waterproofing the motor part, thereby reducing rotation loss of the motor part.
[0019]
The invention according to claim 2 is the reversible pump according to claim 1, wherein the reversing impeller is formed integrally with the rotor by a magnetic material.
[0020]
ADVANTAGE OF THE INVENTION According to the reversible pump of this invention, the number of parts which comprise a reversing impeller is reduced and cost reduction is achieved, the adhesion part between parts is lost, the dimensional accuracy and strength of an impeller are improved, and the pump reliability is improved. Can be increased.
[0021]
The invention according to claim 3 is such that the forward rotation pump chamber is disposed above the pump section, the forward rotation water intake port is opened upward of the pump, and the forward rotation discharge port is directed upward or laterally of the pump. 3. The pump chamber according to claim 1, wherein the pump chamber is open, the pump chamber for reverse rotation is disposed below the pump unit, and the suction port for reverse rotation and the discharge port for reverse rotation are open to the side of the pump. Is a reversible pump.
[0022]
ADVANTAGE OF THE INVENTION According to the reversible pump of this invention, the longitudinal dimension of a pump is shortened sharply, flattening becomes possible, the installation property in a dishwasher is improved, and the dishwasher can be made compact and small. In addition, at the time of forward rotation of the pump, flowing water is absorbed from a water inlet opened toward the upper part of the pump, and discharged from a discharge opening opened toward the upper part or the lateral direction of the pump, so that water can be efficiently supplied. The washing water can be maintained at a high pressure because it can be directly connected to the tower nozzle of the dishwasher or can be connected upward using a connection hose, and at the time of reverse rotation, drains wastewater from the dishwasher from the water inlet and outlet that are opened on the side, The amount of water can be reduced.
[0023]
The invention according to claim 4 is the reversible pump according to any one of claims 1 to 3, wherein the stator is molded with a mold resin.
[0024]
ADVANTAGE OF THE INVENTION According to the reversible pump of this invention, the water resistance and insulation of the iron core of a stator, a coil, and a circuit board improve, and can extend the life of a pump and a dishwasher.
[0025]
The invention according to claim 5 is the reversible pump according to any one of claims 1 to 4, wherein the motor section is driven by a sine wave PWM drive circuit.
[0026]
ADVANTAGE OF THE INVENTION According to the reversible pump of this invention, exact rotation speed control of a motor can be performed, rotation at the time of a start and a stop is made smooth, and rotation unevenness during operation is reduced.
[0027]
According to a sixth aspect of the present invention, there is provided a dishwasher having a built-in pump for supplying washing water to a washing tank and discharging wastewater after washing, wherein the pump is a reversible pump according to any one of claims 1 to 5. A dishwasher characterized in that washing water is supplied to a washing tank from a forward rotation pump chamber, and waste water after washing is discharged from a reverse rotation pump chamber.
[0028]
The invention according to claim 7 is a dishwasher having a built-in pump for supplying washing water to a washing tank and discharging sewage after washing, wherein the pump is the reversible pump according to any one of claims 1 to 5. A dishwasher characterized in that washing water is supplied to a washing tank from a pump chamber for reverse rotation and sewage after washing is discharged from a pump chamber for normal rotation.
[0029]
According to the dishwasher according to claim 6 or 7, the dishwasher is miniaturized, the washing water is pumped to the washing tank according to the operation direction of the pump to effectively wash the dishes, and the sewage after washing. A compact, sanitary and quiet running dishwasher that can efficiently drain without reducing the amount of residual water and causing "air biting" can be obtained at a low price, and the suction and discharge ports of the pump The degree of freedom in the arrangement of the devices is increased, and the ease of installation in the apparatus is improved.
[0030]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
[0031]
(1st Embodiment)
FIG. 1 is a longitudinal sectional view of a reversible pump 1 (hereinafter, simply referred to as a pump 1) of the embodiment.
[0032]
The pump 1 includes a pump section 2 and a motor section 3.
[0033]
The pump section 2 includes an upper casing 41 having a forward rotation water suction pipe 12 and a forward rotation discharge pipe 14 provided upwardly of the pump, and a reverse rotation water absorption pipe 22 and a reverse rotation discharge pipe 24 provided on both sides. The lower casing 42 is fastened to the partition plate 18 for vertically partitioning the pump unit 2 with the waterproof rubber 44 interposed therebetween.
[0034]
The pump unit 2 is divided into a forward rotation pump chamber 10 having a forward rotation water suction port 11 and a forward rotation discharge port 13 at an upper part, and a reverse rotation pump chamber 20 having a reverse rotation water absorption port 21 and a reverse rotation discharge port 23 at a lower part. Have been.
[0035]
In the reverse rotation pump chamber 20, a fixed shaft 51 is embedded in a support portion 43 provided at the center of the lower casing 42 and is fixed to the center of the pump portion 2.
[0036]
A ring-shaped stator 31 is arranged on the outer periphery of the fixed shaft 51. The stator 31 is composed of an iron core 32 and a coil 33 wound therearound. The stator 31 is accommodated in an annular space portion 44 centered on a fixed shaft support portion 43 of a lower casing 42, and a motor is driven under the annular space portion 44. A drive circuit board 34 is disposed, and the whole is molded with a mold resin 35 and integrated with the reverse rotation pump chamber 20.
[0037]
In the reverse rotation pump chamber 20, a reverse rotation impeller 25 having a Wesco-type reverse rotation blade 26 on an outer peripheral portion is rotatably arranged with respect to a fixed shaft 51.
[0038]
The reversing impeller 25 is integrally formed of a magnetic resin as a whole, and a Wesco-type blade portion 26 on the outer peripheral portion is disposed so as to face the outer peripheral portion of the ring-shaped stator 31. Are integrally formed.
[0039]
That is, in the motor section 3, the stator 31 and the reversing impeller 25 which also serves as a rotor constitute an outer rotor type three-phase brushless DC motor.
[0040]
The drive circuit board 34 implements a sinusoidal PWM drive method for a three-phase brushless DC motor. As shown in the block diagram of FIG. 3, a position signal from the Hall IC 61 is sent to the IC circuit 64 via the PLL circuit 62 and the counter circuit 63. The PLL circuit 62 and the triangular wave generation circuit 66 operate according to a clock signal from a system clock generation circuit including an oscillator. Then, a drive signal is supplied from the IC circuit 64 to each of the U-phase, V-phase, and W-phase coils of the motor, and the rotation direction (forward rotation, reverse rotation) and the speed of the motor unit 3 are controlled accurately.
[0041]
In the forward rotation pump chamber 10, a forward rotation impeller 15, which is a semi-open type equipped with a hughal type forward rotation blade 16 above the impeller base, has washers 53, 54 above and below a fixed shaft 51, and a metal bearing 52. And a rotatable water inlet 11 for opening on the fixed shaft 51 line.
[0042]
The forward rotation impeller 15 is coaxially connected to the reverse rotation impeller 25 at a connection portion 17, and rotates following the rotation of the reverse rotation impeller 25 in the forward rotation pump chamber 10 defined by the partition plate 18. Is what you do.
[0043]
In the pump 1 having the above-described configuration, the rotor, that is, the reverse impeller 25 rotates when the motor unit 3 is energized, and the reverse impeller 25 or the reverse impeller 25 is driven in accordance with the forward or reverse operation direction. A suction action is generated in one of the forward rotation impeller 15 that rotates following the suction, and flowing water is absorbed in one of the forward rotation pump chamber 10 and the reverse rotation pump chamber 20.
[0044]
During normal rotation of the pump 1, flowing water is absorbed into the forward rotation pump chamber 10 from a forward rotation water suction port 11 opened upward, and a centrifugal action of the hugal-type blade 16 generates a swirling flow in the pump chamber 10 to discharge the normal rotation. The water is sent to the pipe 14 and forms a flow path 19 that is bent 90 degrees from the forward rotation pump chamber 10 toward the forward rotation discharge port 13 opened upward from the pump, and discharges flowing water to the outside of the pump 1.
[0045]
Further, at the time of reverse rotation, flowing water is sucked into the reverse rotation pump chamber 20 from the reverse rotation water suction port 21 opened to the side of the reverse rotation pump chamber 20, and a vortex is generated in the pump chamber 20 by the rotation of the Wesco type blade 26. Thus, a flow path 29 for feeding to the reverse rotation discharge pipe 24 is formed, and flowing water is discharged from the reverse rotation discharge port 23 to the outside of the pump 1.
[0046]
Accordingly, in the pump 1, the rotatable reversing impeller 25 disposed in the reversing pump chamber 20 also serves as the rotor of the motor unit 3, and the pump unit 2 and the motor unit 3 share the reversing pump chamber 20. Therefore, the rotor as an independent component is not required, and the pump unit 2 includes the motor unit 3. Flattening can be achieved by shortening the dimension in the direction.
[0047]
As a result, the pump 1 can be easily incorporated into an apparatus such as a dishwasher, and can be made compact and effective in occupying space, and the dishwasher can be reduced in size and weight.
[0048]
Further, since the pump unit 10 and the motor unit 20 are shared, the pump structure can be greatly simplified as compared with the conventional pumps 100 and 200, and the oil seal and noise countermeasures including the rotor can be provided. For this purpose, there is no need for a complicated part configuration for forming the inside of the pump unit and its flow path, and the number of parts can be reduced to reduce the cost and to obtain high reliability.
[0049]
Furthermore, since the pump section 10 and the motor section 20 are made sealless, water leakage does not occur at the seal section, and the life is extended, and deterioration of the pump performance due to frictional resistance between the motor rotating shaft and the seal material is also avoided. Is done.
[0050]
Since the discharge port 13 for normal rotation is opened toward the upper side of the pump, the running water is discharged upward of the pump 1 during the normal rotation operation, so that the discharge port 13 is directly connected to a tower nozzle of a dishwasher or the like. It is possible to prevent the pressure loss of the washing water and maintain the spraying power of the washing water to the dishes. Of course, the direction of the discharge port can be changed depending on the structure of the dishwasher and the use of the pump.
[0051]
And since there is no opening below the pump, it can be installed at the bottom of the device such as a dishwasher, or it can be installed in the water tank of the device, and the space in the dishwasher can be used. Can be further reduced in size and size.
[0052]
In addition, since the water suction port 21 for reverse rotation and the discharge port 23 are opened to the side of the pump 1, the drainage in the apparatus using this pump is improved, the amount of residual water is reduced, and the air flow into the pump 1 is reduced. Mixing can be prevented and noise generation due to "air biting" can be suppressed.
[0053]
When the motor unit 3 forms an outer rotor type motor, the pump output can be effectively used, and the discharge performance can be easily obtained.
[0054]
In addition, the motor unit 3 comprises a brushless DC motor, and by using a sine wave PWM drive circuit, the control of the rotation speed and the rotation direction of the pump 1 becomes easy and accurate, and the generation of the brush sound at the time of driving is eliminated. The effect of reducing the noise due to the low-speed operation can be obtained. Further, by molding the motor section 3, the water resistance and insulation of the stator 31 can be improved, and the life of the pump can be extended.
[0055]
(Second embodiment)
FIG. 2 is a schematic structural diagram of the dishwasher 4 according to the second embodiment.
[0056]
The dishwasher 4 is a dishwasher incorporating the above-described pump 1 as a pump that supplies washing water for washing dishes to a washing tank and sends sewage after washing to a drain port.
[0057]
As shown in the figure, the dishwasher 4 is provided with a sealable washing tank 61 provided with a door 60 that can be opened and closed at the front to open and close dishes 63, and tableware installed on a table 62 in the washing tank 61. A rack 64 for setting the type 63, a water tank 67 disposed at the bottom of the apparatus for collecting and storing cleaning water 65 and sewage 66 after cleaning, and a cleaning water 65 provided at the lower central portion of the cleaning tank 61. A rotary tower nozzle 68 provided with a plurality of injection holes 69, a pump 1 for supplying washing water 65 to the tower nozzle 68 and discharging sewage 66 after washing out of the machine, and further drying the dishes 63 after washing. A hot air fan 71 for drying, an exhaust duct 72 for discharging the hot air out of the machine, and a microcomputer for controlling the entire dishwasher 4 such as washing, rinsing, and drying processes and operation of the pump 1 are mainly provided. System A circuit 73 is built in the main body of the dishwasher 4, and a switch for selecting a washing course by automatic operation of the dishwasher 4 or a manual operation, and an operation panel 74 having indicators and the like are provided on the outer front surface of the apparatus. .
[0058]
The pump 1 is installed inside a concave portion 68 in a water tank 67 provided at the bottom of the dishwasher 4. The forward rotation water suction port 11 of the pump 1 is opened at a height near the bottom surface 67a of the water tank 67, and the forward rotation discharge port 13 opening upward is directly connected to a supply pipe 77 to the tower nozzle 68. Reference numeral 21 is opened in the concave portion 68, and the discharge port 23 for reverse rotation is connected to a drain pipe 76 for discharging the waste water after washing to the outside of the machine. Further, a water supply pipe 75 from tap water or a hot water supply device for supplying the cleaning water 65 to the water tank 67 is provided in the water tank 67.
[0059]
In the dishwasher 4 having the above-described configuration, after a rack 64 accommodating the dishes 63 is arranged at a predetermined position on the table 62, a predetermined amount of washing water 65 is supplied from a water supply pipe 75 to a water tank 67 in which dishwashing detergent has been charged. After being accumulated and stored, the operation of the pump 1 is started.
[0060]
The cleaning water 65 sucked from the normal rotation water suction port 11 by the normal rotation operation of the pump 1 becomes pressurized water by the discharge action of the pump 1, is discharged from the normal rotation discharge port 13, is pressure-fed in the supply pipe 77, and rotates. The tableware 63 is washed by randomly spraying the tableware 63 from a plurality of injection holes 69 provided in the possible tower nozzle 68, and the wastewater collected in the water tank 67 by the reverse operation of the pump 1 after washing is drained. This is discharged from the pipe 76 to the outside of the machine.
[0061]
Subsequently, the rinsing step is the same operation as the above-mentioned rinsing step. Using tap water as the rinsing water, the rinsing water stored in the water tank 67 by the normal operation of the pump 1 is sucked into the pump 1 and the tower nozzle is washed. After rinsing water is sprayed onto the dishes 63 from the spray holes 69 at 68, the detergent and food residues adhered to the dishes 63 in the washing step are washed away, and then the rinsing collected in the water tank 67 by the reverse operation of the pump 1 is completed. The later sewage is discharged from the drain pipe 76 to the outside of the machine.
[0062]
When the washing and rinsing steps are completed, the hot air fan 71 for drying is operated, the hot air circulates in the washing tank 61, the dishes 63 are dried, and a series of dish washing steps is completed.
[0063]
In the dishwasher 4, since the pump 1 is reduced in size and flattened by shortening the vertical dimension of the pump, the pump 1 can be installed in the apparatus with less installation space than the conventional dishwasher 4 shown in FIG. In addition, the dishwasher 4 can be made compact and the apparatus can be downsized. In particular, the operability can be improved by reducing the height of the dishwasher.
[0064]
In addition, since the water resistance is improved, the pump 1 can be installed in the water tank, and the apparatus can be further compacted and downsized by utilizing an idle space.
[0065]
In addition, the cost can be reduced by simplifying the structure of the pump 1 and reducing the number of parts, thereby contributing to the cost reduction of the dishwasher.
[0066]
In addition, the performance and operation of the dishwasher, such as improvement of the washing performance and drainage of the dishwasher with the improvement of the pump characteristics, durability, noise reduction, etc. of the pump 1, the long life and quiet operation can be obtained. Properties and durability can be improved. In particular, since the drainage property is greatly improved as compared with the conventional pump, it is effective in reducing noise at the time of draining sewage and reducing the amount of residual water, thereby improving hygiene and solving the problem of generation of offensive odor.
[0067]
【The invention's effect】
As described above, according to the reversible pump of the present invention, it is possible to reduce the size and flatten the pump, improve the pump characteristics, and reduce the noise generation. .
[0068]
A dishwasher using this pump is a compact dishwasher that is quiet, has low noise during drainage, is particularly hygienic, and has excellent washing performance and durability. Can be offered down.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a pump according to a first embodiment.
FIG. 2 is a schematic structural view of a dishwasher according to a second embodiment.
FIG. 3 is a block diagram of a motor unit drive circuit according to the embodiment.
FIG. 4 is a longitudinal sectional view of a conventional pump 100.
FIG. 5 is a longitudinal sectional view of a conventional pump 200.
FIG. 6 is a schematic structural diagram of a dishwasher using a pump 200.
[Explanation of symbols]
1 Pump 2 Pump part 3 Motor part 4 Dishwasher 10 Forward pump chamber 11 Forward water inlet 13 Forward discharge port 15 Forward impeller 16 Forward rotation blade 18 Partition plate 20 Reverse rotation pump chamber 21 Reverse rotation water suction port 23 Reverse rotation discharge port 25 Reverse rotation impeller 26 Reverse rotation blade 31 Stator 51 Fixed axis

Claims (7)

The pump section is a reversible pump partitioned into a forward rotation pump chamber and a reverse rotation pump chamber,
The forward rotation pump chamber and the reverse rotation pump chamber each have a water intake port and a discharge port,
In the reverse rotation pump chamber, a fixed shaft is provided, having a ring-shaped stator on the outer periphery of the fixed shaft,
A rotor is rotatably arranged on the outer periphery of the stator with respect to the fixed shaft, and a reversing impeller is formed integrally with the rotor,
In the forward rotation pump chamber, a forward rotation impeller is rotatably disposed on the fixed shaft,
The forward rotation impeller and the reverse rotation impeller are rotated by an outer rotor type motor unit configured by the stator and the rotor,
At the time of normal rotation, water is sucked into the normal rotation pump chamber from the normal rotation water suction port and discharged from the normal rotation discharge port,
A reversible pump characterized in that at the time of reverse rotation, water is sucked into the reverse rotation pump chamber from the reverse rotation water suction port and discharged from the reverse rotation discharge port. The reversible pump according to claim 1, wherein the reversing impeller is formed integrally with the rotor using a magnetic material. The forward rotation pump chamber is disposed above the pump unit, the forward rotation water intake port is opened toward the upper part of the pump, and the forward rotation discharge port is opened upward or the lateral direction of the pump,
The reversible pump according to claim 1, wherein the reverse rotation pump chamber is arranged below the pump unit, and the reverse rotation water suction port and the reverse rotation discharge port are opened on a pump side part. 4. . The reversible pump according to any one of claims 1 to 3, wherein the stator is molded with a mold resin. The reversible pump according to any one of claims 1 to 4, wherein the motor unit is driven by a signal from a sine wave PWM drive circuit. In a dishwasher with a built-in pump that supplies washing water to the washing tank and discharges wastewater after washing,
The pump is a reversible pump according to any one of claims 1 to 5,
A dishwasher characterized in that washing water is supplied to a washing tank from a forward rotation pump chamber, and waste water after washing is discharged from a reverse rotation pump chamber. In a dishwasher with a built-in pump that supplies washing water to the washing tank and discharges wastewater after washing,
The pump is a reversible pump according to any one of claims 1 to 5,
A dishwasher characterized by supplying washing water to a washing tank from a pump chamber for reverse rotation and discharging waste water after washing from a pump chamber for forward rotation.

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