JP2003269388A - Pump and dish washer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump having reduced noise, improved water discharge performance, particularly improved drainability, and reduced size and weight, and a low noise, and also to provide sanitary dish washer using this pump, superior in cleaning performance and drainability. <P>SOLUTION: This pump 1 includes a motor part 10, and a pump part 20. A rotor 16 is rotatably arranged on the inner periphery of a stator 11 in the motor part 10. The pump part 20 has a normal rotation pump chamber 21 and a reverse rotation pump chamber 31 partitioned by a partition wall 40. A normal rotation impeller 22 is arranged in the normal rotation pump chamber 21 having a suction port 25 for normal rotation on a line of a rotary shaft 18. A reverse rotation impeller 32 is arranged in the reverse rotation pump chamber 31 having a suction port 35 for reverse rotation. The partition wall 40 has a normal rotation pump chamber opening part 41. The reverse rotation impeller 32 has a passing hole 34 for communicating the suction port 25 for normal rotation with the normal rotation pump chamber opening part 41 in a rotary shaft peripheral part. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump that absorbs and discharges a fluid by selecting a water intake port and a discharge port in accordance with normal rotation or reverse rotation of an impeller, and circulates cleaning water using the pump in the apparatus. However, the present invention relates to a dishwasher that drains dirty water.

[0002]

2. Description of the Related Art Conventionally, a pump used in a dishwasher has a function of circulating washing water in the apparatus for washing and rinsing dishes and a function of draining waste water after washing to the outside. One pump is equipped with two types of impellers and two water inlets and outlets, and two types of impellers are used according to the forward or reverse rotation of the motor. There is used a pump that sucks water into the pump and discharges cleaning water or dirty water from one of the outlets following the water inlet.

An example of the above conventional pump will be described with reference to a vertical sectional view of the pump shown in FIG.

In the pump 100 shown in FIG. 3, a motor 111 is arranged in a motor portion 110 covered with an outer shell 118, and the motor portion 110 and the pump portion 120 are horizontally connected with a packing 155 in between to form a pump. , The pump unit 120 has 2
Each type of impeller has two types of impellers, two pump chambers, a water suction port and a discharge port for sucking and discharging a fluid by the two types of impellers, and their flow paths.

The motor 111 includes a stator 112 arranged inside the outer shell 118 and a rotor 113 arranged inside the stator 112.
The rotor 113 has a rotating shaft 114 whose outer shell 1
The cooling fan 11 is rotatably supported by bearings 115 and 116 disposed on both sides of the cooling fan 11, and is provided outside the outer shell 118.
An AC induction type motor including 7 is configured.

The pump section 120 has a casing (A) 15
1 and the casing (B) 152 sandwich the partition wall 153,
A forward rotation impeller 122 and a reverse rotation impeller 132, which are formed by partitioning the forward rotation pump chamber 121 and the reverse rotation pump chamber 122, are coaxially connected to the rotation shaft 114 of the motor 111. And a forward rotation pump chamber 121, and a forward rotation water inlet 123 and a forward rotation discharge port 124 are provided in the forward rotation pump chamber 121.
1, a reverse water inlet 133 and a reverse outlet 134 are provided.

In the above conventional pump 100, the motor 11
In the normal rotation of 1, the fluid sucked from the normal rotation water intake 123 by the suction action of the normal rotation impeller 122 is flowed through the flow path 125.
Through the pump chamber 121 for normal rotation through the pump chamber 12
A swirling flow is generated in the nozzle 1 and is discharged from the normal rotation discharge port 124 to the outside of the pump 100.

On the other hand, when the motor 111 is rotated in the reverse direction, the fluid sucked from the reverse rotation water intake 133 by the suction action of the reverse rotation impeller 132 flows into the reverse rotation pump chamber 132, and the water in the pump chamber is viscous so that the impeller rotates. A vortex is generated after 132 passes and is discharged from the pump through the reverse rotation outlet 134.

During the normal rotation and the reverse rotation, the two types of impellers 122 and 132 rotate at the same time, but only one impeller has suction and discharge functions depending on the rotation direction.
Since the two pump chambers are partitioned by the partition wall 153, fluid is not mixed between the pump chambers, and the water discharge operation is performed by only one impeller.

The motor section 110 and the pump section 1 as described above.
A conventional pump 100 having a pump structure in which 20 and 20 are connected horizontally is installed horizontally in a dishwasher, and a normal rotation impeller 122 functions to circulate cleaning water when washing dishes and a reverse rotation blade when draining. It is common for the car 132 to function and drain dirty water out of the system.

In the conventional dishwasher using the pump 100, the reverse water inlet 133 is not located at the bottom of the reverse pump chamber 131.
When the amount of water flowing into the pump chamber 13 gradually decreases
It mixes into the inside of the No. 1 and causes so-called "air biting", which causes noise.

Further, after the cleaning, the drainage of the dirty water becomes insufficient, and a large amount of residual water remains in the dishwasher, which is unfavorable in terms of hygiene and causes a bad odor.

Further, in the pump 100 having the above structure, the water suction port 133 and the discharge port 1 provided in the reverse rotation pump chamber 131.
By 34, the blade diameter of the reversing impeller 132 is limited, and it is necessary to rotate the impeller at high speed during drainage, which further increases noise generation.

Further, the motor portion 110 having the AC induction motor 111 arranged in a horizontal shape occupies a space to enlarge the pump, and the piping around the pump also has a space to make the dishwasher compact and the pump portion. There is also a problem of electric leakage due to water leakage from 120 and fear of electric shock.

[0015]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems and improves the pump structure to reduce noise and improve the water discharge capacity of the pump. The purpose is to provide a pump that is suitable for a dishwasher that is small and lightweight, and that has low noise and hygiene and is excellent in cleaning performance and drainage. And

[0016]

The invention of claim 1 includes a motor section and a pump section having a discharge port and two water suction ports, and in the motor section, the rotor is provided on the inner circumference of the stator. Is rotatably arranged, and in the pump part, an impeller having a forward rotation blade and a reverse rotation blade connected to a rotation shaft of the rotor is provided, and the pump portion is provided for a normal rotation partitioned by a partition wall. There is a pump chamber and a reverse rotation pump chamber, the forward rotation impeller is arranged in the forward rotation pump chamber, the reverse rotation impeller is arranged in the reverse rotation pump chamber, the forward rotation pump chamber, A forward rotation water pump is provided on the rotation axis, the reverse rotation pump chamber has a reverse rotation water suction port, and the partition wall is a normal rotation pump for allowing fluid to flow into the normal rotation pump chamber. A chamber opening, and further, the reversing impeller has
The normal rotation water intake port and the normal rotation pump chamber opening portion have a passage hole through which a fluid flows in the peripheral portion of the rotation shaft, and when the impeller is normally rotated, the fluid from the normal rotation water absorption port is provided. Is sucked from the passage hole and the forward rotation pump chamber opening into the forward rotation pump chamber and sent to the discharge port, and when the impeller rotates in the reverse direction, fluid from the reverse rotation water intake port is sucked into the reverse rotation pump chamber. The pump is characterized in that it is then sent to the discharge port.

According to the pump of the present invention, the motor part and the
In the normal rotation pump chamber formed at the upper part of the pump portion, the fluid is supplied from the forward rotation water inlet opening at the bottom of the pump portion to the normal rotation pump chamber opening of the partition wall. Also, since it flows into the discharge port through the passage hole provided in the reverse rotation impeller that communicates with it and sends the fluid from the reverse rotation water intake port to the discharge port in the reverse rotation pump chamber, the pump structure is made compact and compact, While reducing the weight, it is possible to improve the water absorption and discharge properties of the pump, reduce the amount of residual water in the device in which the pump is installed, and prevent air from entering the pump to reduce noise. Further, since the diameter of the impeller can be designed to be larger than that of the conventional structure, the pump performance can be maintained even at low speed rotation and noise generation can be suppressed. further,
Since the motor section is located above the flow path, it is possible to prevent electric leakage and electric shock due to water leakage.

According to a second aspect of the present invention, the normal rotation pump chamber has a normal rotation discharge port, the reverse rotation pump chamber has a reverse rotation discharge port, and the normal rotation pump chamber has the normal rotation discharge port. The fluid from the water suction port is sucked into the normal rotation pump chamber from the passage hole and sent to the normal rotation discharge port, and when the impeller rotates in the reverse direction, the fluid from the reverse rotation water intake port enters the reverse rotation pump chamber. 2. The liquid is sucked and sent to the reversing discharge port.
The pump described in 1.

In the pump of the present invention, the normal rotation flow path and the reverse rotation flow path of the impeller are clearly separated from each other, and the flowing water flows through the dedicated flow path, so that the two kinds of fluids do not mix. Therefore, in the dishwasher using this pump,
The washing water supply passage is separated from the wastewater drainage passage so that the washing water can be sufficiently exerted without lowering its washing ability.

According to a third aspect of the present invention, in the pump section, the normal rotation pump chamber partitioned by a partition wall is arranged at an upper portion, the reverse rotation pump chamber is arranged at a lower portion, and the reverse rotation impeller is arranged as described above. The pump according to claim 1 or 2, wherein the pump is arranged in a reverse rotation pump chamber.

In the pump of the present invention, since the impeller for reverse rotation is arranged in the pump chamber for reverse rotation under the pump section, the water absorption and discharge properties during reverse operation are further improved, and the pump installed inside the apparatus is improved. It is possible to reduce the amount of residual water, prevent air from entering the pump, and reduce noise.

According to a fourth aspect of the invention, the forward rotation discharge port is
The pump according to any one of claims 1 to 3, wherein the pump is opened upward.

In the pump of the present invention, the fluid is discharged toward the upper side of the pump during the normal rotation operation of the impeller. Therefore, in the dishwasher using this pump, the discharge port of the pump can be directly connected to the tower nozzle of the dishwasher, the pressure loss of washing water can be prevented, and the washing water jetting force to the dishes can be maintained at a high pressure. .

According to a fifth aspect of the present invention, a substantially cylindrical guide for guiding the fluid from the normal rotation water intake port to the normal rotation pump chamber opening is provided around the passage hole of the reverse rotation blade for the normal rotation. The pump according to any one of claims 1 to 4, wherein the pump is provided toward the opening of the water intake port.

In the pump of the present invention, the fluid from the water inlet for normal rotation is made to flow into the normal rotation pump chamber without waste through the passage hole of the reverse rotation impeller and the opening for normal rotation pump chamber provided in the partition wall. be able to.

According to a sixth aspect of the present invention, in the pump according to any one of the first to fifth aspects, the partition wall has a stepped structure having a stepped portion on the peripheral portion of the rotary shaft and the outer peripheral portion thereof. is there.

In the pump of the present invention, due to the step provided on the partition wall, the two types of impellers arranged in the upper and lower pump chambers avoid mutual interference caused by simultaneous rotation and ensure their respective water discharge performance. can do. Further, it is possible to sufficiently secure the flow path of the reverse flow path.

The invention according to claim 7 is characterized in that a filling portion for preventing air accumulation is provided in a space portion between the upper portion of the normal rotation blade and the normal rotation pump chamber.
The pump according to any one of 1.

In the pump of the present invention, the air collecting portion in the normal rotation pump chamber can be eliminated, and the fluid flow in the pump chamber can be made smooth to improve the pump performance.

According to an eighth aspect of the present invention, the motor section constitutes a brushless DC motor.
It is a pump in any one of-7.

In the pump of the present invention, since the pump is driven and controlled by the brushless DC motor, it is easy to control the rotation speed and the rotation direction of the pump, which is effective in reducing noise due to low speed operation, and the motor portion is compact. The size of the pump can be reduced. Further, the motor part can be molded to improve water resistance and insulation.

A ninth aspect of the present invention is the pump according to any one of the first to eighth aspects, wherein the forward rotation blade is a fugal type and the reverse rotation blade is a wesco type.

In the pump of the present invention, the fugal type blades efficiently generate a swirling flow in the pump chamber, and the Wesco type blades generate a vortex flow to send the fluid to the discharge port. The car can be made compact.

The invention according to claim 10 is the pump according to claim 9, characterized in that the blade for forward rotation is a semi-open type.

In the pump of the present invention, the impeller for normal rotation has a more compact structure to efficiently generate the swirling flow in the pump chamber and maintain the water discharge performance of the pump.

The invention of claim 11 is a dishwasher having a built-in pump for supplying cleaning water to a cleaning tank and sending the dirty water after cleaning to a drain port, wherein the pump is any one of claims 1-10. A dishwasher characterized by being the described pump.

According to the dishwasher of the present invention, the washing water is supplied to the washing tank during the normal rotation of the pump to effectively wash the dishes, and the sewage after the washing can be efficiently drained during the reverse rotation. Therefore, it is possible to obtain a compact dishwasher that reduces noise and is hygienic.

[0038]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings.

(First Embodiment) FIG. 1 is a longitudinal sectional view of a pump 1 according to the embodiment.

The pump 1 comprises a motor unit 10 and a pump unit 20 having two water suction ports 25 and 35 and discharge ports 26 and 36 at the bottom of the pump, which are vertically integrated. That is, the motor unit 10 is arranged above the pump unit 20.

The motor section 10 is provided with a stator 11 composed of a stator core 12 arranged in a ring shape and a coil 13 wound around the stator core 12, and a circuit board 14 for driving and controlling the motor is provided below the stator 12. And is entirely molded with the molding resin 15.

Further, the magnetic body 17 along the inner circumference of the stator 11
The rotor 16 having the upper and lower outer shells 54 of the motor unit 10,
The rotating shaft 1 is attached to the bearings 19a and 19b arranged on the reference numeral 56.
8 and is rotatably arranged at the center of the motor unit 10.

Therefore, the motor section 10 constitutes a brushless DC motor.

The pump portion 20 is formed by a casing (A) 51 and a casing (B) 52, the pump portion 20 is vertically partitioned by a partition wall 40, and a normal rotation pump chamber 21 is provided.
And the reversing pump chamber 31 are partitioned and formed, and the motor unit 1
An oil seal 57 arranged in the casing (A) 51 on the lower side of 0 ensures the waterproofness of the rotary shaft 18 portion and is fastened in a vertical shape to form the pump 1.

In the pump section 20, the rotary shaft 1 of the rotor 16
A normal rotation impeller 22 having a fugal-shaped blade 23 connected to 8 is arranged in the normal rotation pump chamber 21, and the partition wall 4
A reverse rotation impeller 32 having Wesco-shaped blades 33 coaxially connected to the rotary shaft 18 with 0 interposed therebetween is arranged in the reverse rotation pump chamber 31.

The forward rotating impeller 22 has a fugal blade 23 under the impeller base 24 connected to the rotary shaft 18.
It is formed in a semi-open type.

The forward rotation pump chamber 21 has a forward rotation water inlet 25 opening downward at the bottom of the pump portion 20 on the axis of rotation 18, and a running water passage hole 41 and a reverse rotation impeller 32 provided in the partition wall 40. A flow path 45 that communicates from the water intake port 25 to the normal rotation pump chamber 21 is formed through a flowing water passage hole 34 provided in the.

Further, in order to guide the fluid from the water inlet 25 for normal rotation to the passage hole 34 and the opening 41 of the normal rotation pump chamber of the partition wall 40 in the peripheral portion around the passage hole 34 of the reverse rotation impeller 32. The cylindrical guide 38 is provided toward the opening of the forward rotation water intake port 25 to prevent the fluid sucked from the forward rotation water intake port 25 from flowing into the reverse rotation pump chamber 31 and to pass through the passage hole 34.
Then, it passes through the flow passage 45 through the forward rotation pump chamber opening 41, and flows into the forward rotation pump chamber 21 without waste.

Further, in the forward rotation pump chamber 21, a space 53 formed between the forward rotation impeller 22 and the upper wall surface of the pump chamber 21 is provided with a filling portion 53 for preventing air accumulation.

The partition wall 40 has a stepped structure having a step 42 on the peripheral portion of the rotary shaft 18 and the outer peripheral portion thereof.

The forward rotation discharge port 26 is opened toward the upper side of the pump at the tip of the discharge pipe 28 following the discharge hole 27 from the normal rotation pump chamber 21, and the discharge port 27 of the forward rotation pump chamber 21 is approximately 90 °. A flow path 46 that bends to the discharge port 26 is formed.

The reversing pump chamber 31 has a reversing water inlet 35 opening downward at the bottom of the pump portion 20, and the water inlet 3
The water from the fluid 5 is supplied to the reversing impeller 32 through the discharge hole 37 of the reversing pump chamber 31 by the water feeding action of the reversing impeller 32.
A flow path 47 is formed for sending to.

In the pump 1 having the above-mentioned structure, the motor section 10 made up of a brushless DC motor and the water inlets 25, 3 at two places
5 and the pump portion 20 provided at the bottom of the pump portion 20 are formed in a vertical shape, and in the forward rotation pump chamber 21 formed on the upper side of the pump portion 20, the fluid from the forward rotation water suction port 25 is fed to the reverse rotation impeller. A through hole 34 provided in 32 and a normal rotation pump chamber opening 41 of a partition wall 40 that communicates with the passage hole 34, flow into the normal rotation discharge port 26 by the centrifugal action of the semi-open type fugal blade 23, and a reverse rotation pump. In the chamber 31, the fluid from the reversing water suction port 35 is sent to the reversing discharge port 36 by the water feeding action of the Wesco type vane 33, so that the impeller is made compact and the volume occupied by the pump unit 20 is reduced. Since the connected motor is not required, the pump structure can be made compact and small in size and weight.

Further, since the two water suction ports 25 and 35 are located at the bottom of the pump 1 and open downward, the pump 1
It is possible to improve water absorption, prevent air from being mixed into the pump 1, reduce noise, and reduce the amount of residual water in the device using the pump 1. Further, since the diameter of the impeller, especially the diameter of the reversing impeller 22 can be designed larger than that of the conventional structure,
Pump performance can be maintained even at low speed rotation, and noise generation can be suppressed.

Further, the filling portion 53 in the space portion of the normal rotation pump chamber 21 eliminates air accumulation in the pump chamber 21 and smoothes the flow of fluid.

Further, the partition wall 40 having a stepped structure is arranged in the upper and lower pump chambers by the step 42 and is simultaneously rotated.
The impellers of one sheet can be prevented from interfering with each other to exhibit their respective pump performances, and a reversing flow path can be sufficiently secured to effectively generate a vortex flow.

Further, since the normal rotation discharge port 26 is opened toward the upper side of the pump, the fluid is discharged toward the upper side of the pump 1 during the normal rotation operation, and the discharge port 26 is directly connected to the tower nozzle of the dishwasher or the like. It can be connected to prevent pressure loss of washing water and maintain the washing water jetting force to 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.

Further, in the pump 1, since the drive of the pump 1 is controlled by the brushless DC motor, it becomes easy to control the rotation speed and the rotation direction of the pump 1, which is effective in reducing the noise caused by the low speed operation. Can be made compact and the size of the pump can be reduced. Further, the motor portion 10 can be molded to improve water resistance and insulation properties, and the life of the pump can be extended. Further, since the motor unit 10 is located above the pump unit 20, it is possible to prevent electric leakage and electric shock due to water leakage from the flow path.

Rotation magnetism is generated in the pump 1 by energizing the motor section 10, the rotor 20 is driven, and the impeller connected to the rotary shaft 18 is rotated to select a water intake port according to the rotation direction. Then, the fluid is sucked and the water discharge operation is performed.

When the rotor 16 rotates in the normal direction, the normal rotation impeller 22 operates, and the fluid sucked from the normal rotation water intake 25 passes through the through hole 34 of the reverse rotation impeller 32 and the normal rotation pump chamber opening of the partition wall 40. After passing through 41, it flows into the normal rotation pump chamber, the centrifugal action of the fugal-shaped vanes 23 generates a swirling flow in the pump chamber 21, and is discharged from the discharge hole 27 to the outside of the pump chamber 21 and flows through the flow path 46 to be discharged. It is discharged from the outlet 26.

At the time of this normal rotation, the fluid sucked from the water suction port 25 has a flow path 45 due to the suction action of the normal rotation impeller 23.
Since it flows through, the water flow hardly flows into the reverse rotation pump chamber 31.

The Wesco-shaped blade 33 of the reversing impeller 32 also rotates at the same time, but since the suction action to the reverse rotation pump chamber 31 is weak, the flow rate is small and the Wesco-shaped blade 3
No vortex due to 3 is generated, and only the water discharge action of the normal rotation impeller 22 works.

When the rotor 16 is rotated in the reverse direction, the reverse rotation impeller 32 works, and the fluid from the reverse rotation water intake 35 is fed into the reverse rotation pump chamber 3.
1, and the vortex of the fluid is generated after passing through the Wesco-shaped blade 33 in the pump chamber 31, and is discharged from the discharge hole 37 to the outside of the pump chamber 31 and discharged from the discharge port 36.

At the time of this reverse rotation, the fluid sucked from the water suction port 35 flows mainly in the outer peripheral portion of the pump chamber 31 according to the vortex generated by the Wesco-shaped blade 33 provided in the outer peripheral portion of the reverse rotating impeller 32. Does not flow into the normal rotation pump chamber 21 from the normal rotation pump chamber opening 41 of the partition wall provided in the central portion of the pump chamber 31.

In this reverse rotation, the normal rotation impeller 22 also rotates in the same manner as described above, but the normal rotation fugal type blade 2
No. 3 does not generate suction and centrifugal action, so water inlet 2 for normal rotation
No fluid inflow from 5 occurs.

Therefore, in the pump 1, since the normal rotation flow passage and the reverse rotation flow passage of the impeller are respectively divided, the flowing water flows through the dedicated flow passage during the normal rotation and the reverse rotation, so that two kinds of fluids are mixed. Without being sent to the discharge port. Therefore, in the dishwasher using this pump, the washing water supply passage is clearly separated from the dirty water passage, and the washing water washing performance is not deteriorated and is sufficiently exerted.

Further, in both the forward rotation and the reverse rotation, the water inlet of the pump is located at the bottom of the pump and opens downward, so that the water absorption is improved and the residual water amount of the fluid is reduced to efficiently suck the fluid. Since the air is sent to the discharge port, it is possible to prevent air from entering the pump 1, to prevent so-called “air trapping” due to mixing of fluid and air, and to significantly reduce noise of the pump.

(Second Embodiment) FIG. 2 is a schematic view for explaining the structure of the dishwasher 2 according to the second embodiment.

The dishwasher 2 is a dishwasher incorporating the above-mentioned pump 1 as a pump for supplying washing water for washing dishes to the washing tank and sending the dirty water after washing to the drain port.

As shown in the figure, the dishwasher 2 has a sealable washing tank 61 provided with a door 60 on the front surface for opening and closing the dishes 63, which are washing items, and a washing tank 6.
1. A rack 64 for setting tableware 63 installed on the table 62 in 1, a water tank 67 for collecting and collecting wash water 65 and sewage 66 after washing disposed at the bottom of the apparatus, and a bottom of the wash tank 61 Injection hole 6 for cleaning water 65 provided in the central part of the side
Rotating tower nozzle 68 equipped with a plurality of 9 and washing water 65
1 for supplying the wastewater 66 to the tower nozzle 68 and discharging the waste water 66 after cleaning to the outside of the machine, a drying hot air fan 71 for drying the tableware 63 after cleaning, and an exhaust duct for discharging the warm air to the outside of the machine. 72 and a control circuit 73 centered on a microcomputer for controlling the entire washing machine 2 such as washing, rinsing and drying steps and the operation of the pump 1 are built in the main body of the washing machine 2 and outside the apparatus. Operation panel 7 equipped with switches for selecting the washing course by automatic operation of the dishwasher 3 and manual operation and display lamps on the front
4 are provided.

The pump 1 is installed in the upper part of the water tank 67, and the normal rotation water suction port 25 and the reverse rotation water suction port 35 are extended to near the bottom of the water tank 67, and the forward rotation discharge port 3 is opened upward.
6 is connected to the supply pipe 77 to the tower nozzle 68, and the reversing discharge port 36 is connected to the drain pipe 76 for draining the dirty water after cleaning. Further, the water supply pipe 75 from the tap water or the water heater that supplies the wash water 65 to the water tank 67 is the water tank 67.
It is located in. In the dishwasher 2 having the above-described configuration, the rack 64 accommodating the dishes 63 is arranged at a predetermined position on the table 62, and then a predetermined amount of wash water 65 is supplied from the water supply pipe 75 to the water tank 67 filled with the dishwashing detergent. After being stored, the operation of the pump 1 is started.

By the normal rotation operation of the pump 1, the cleaning water 65 sucked from the water suction port 25 becomes pressurized water by the discharge action of the pump 1, is discharged from the discharge port 36, is pressure-fed in the supply pipe 77, and is rotatable. The tableware 63 is randomly sprayed from the plurality of spray holes 69 provided in the tower nozzle 68 to wash the tableware 63.

Subsequently, the rinsing step is the same operation as the above-mentioned washing step, and tap water is used as the washing water.
The tap water stored in the water tank 67 is sucked into the pump 1 by the normal operation of the pump 1, and the rinse water is sprayed from the spray hole 69 of the tower nozzle 68 to the tableware 63, and adheres to the tableware 63 in the cleaning process. After washing away the residue of the detergent or food, the reverse sewage operation of the pump 1 discharges the waste water collected in the water tank 67 after the rinsing from the drain pipe 76 to the outside of the machine.

When the washing and rinsing steps are completed, the washing tank 6
The drying fan 71 provided on the side wall of No. 1 operates, hot air circulates in the washing tank 61, the dishes 63 are dried, and a series of dish washing steps is completed.

In the dishwasher 2, the two water suction ports 25, 35 of the pump 1 are opened at the bottom of the water tank 67, and the pump structure described in the first embodiment is improved to improve water absorption and water discharge. Since it is possible to improve the cleaning performance and drainage of the dishwasher, and to prevent the occurrence of "air trapping" in which air enters the pump 1 and mixes with water, It is possible to reduce noise. In particular, drainage is greatly improved over conventional pumps, which is effective in reducing noise when draining wastewater.

Further, the impeller diameter of the pump 1 can be designed to be larger than the conventional one, which enables low speed operation, and the driving of the pump by the brushless DC motor is also effective in reducing noise.

Further, since the drainage of the pump is improved, the residual amount of sewage in the device is reduced, which is good for hygiene,
The problem of offensive odor is also improved.

Since the pump structure is formed in a vertical shape to be small and lightweight and the durability of the motor portion is improved,
The dishwasher can be made compact and its durability can be improved.

[0079]

As described above, according to the present invention,
A compact type that improves water absorption and discharge performance of the pump, and reduces noise generation due to air intrusion into the pump,
A lightweight pump with excellent durability can be obtained.

The dishwasher using this pump is a compact and long-life dishwasher that operates quietly, excels in low noise during drainage, and is good in hygiene.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a pump according to a first embodiment.

FIG. 2 is a schematic structural view of the dishwasher of the second embodiment.

FIG. 3 is a vertical sectional view of a conventional pump.

[Explanation of symbols]

1 ... Pump 2 ... Dishwasher 10: Motor part 11 ... Stator 16 …… Rotor 17 ... Magnetic material 18 ... Rotating axis 20 ... Pump section 21 ... Forward rotation pump room 22 ... Impeller for forward rotation 23 ... Blade for forward rotation 25 ... Water inlet for forward rotation 26 ... Forward rotation outlet 31 ... Pump chamber for reverse rotation 32: Impeller for reverse rotation 33 ... Reverse rotation blade 34 ... Passage hole 35 ... Water inlet for reverse rotation 36 ... Reverse rotation outlet 40 ... Partition wall 41 ... Forward rotation pump chamber opening

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Sawa saki group             13-10 Ekimaecho, Obama City, Fukui Prefecture             Within Baura Co., Ltd. F-term (reference) 3B082 BF01 BF04 BF05                 3H034 AA01 AA13 BB01 BB04 BB06                       CC01 CC03 DD05 DD27 EE12                       EE18

Claims (11)

[Claims] 1. A motor unit, and a pump unit having a discharge port and two water intake ports, wherein in the motor unit, a rotor is rotatably arranged on an inner circumference of a stator, and in the pump unit, An impeller having a forward rotation vane and a reverse rotation vane connected to a rotation shaft of the rotor is provided, and the pump unit has a forward rotation pump chamber and a reverse rotation pump chamber partitioned by a partition wall, The normal rotation impeller is arranged in the normal rotation pump chamber, the reverse rotation impeller is arranged in the reverse rotation pump chamber, and the normal rotation pump chamber has a normal rotation water inlet on the rotation axis. The reverse rotation pump chamber has a reverse rotation water intake port, and the partition wall has a forward rotation pump chamber opening for allowing a fluid to flow into the normal rotation pump chamber. The impeller for the normal rotation has the water inlet for the normal rotation and the normal rotation on the periphery of its rotation axis. The pump chamber opening has a passage hole through which a fluid flows, and when the impeller rotates in the normal direction, the fluid from the water inlet for normal rotation is passed through the passage hole and the pump chamber opening for normal rotation to the normal direction. A pump characterized by being sucked into a diversion pump chamber and sent to a discharge port, and when the impeller is rotated in the reverse direction, the fluid from the water suction port for the reverse rotation is sucked into the pump chamber for the reverse direction and sent to the discharge port. 2. The forward rotation pump chamber has a forward rotation discharge port, the reverse rotation pump chamber has a reverse rotation discharge port, and the fluid from the forward rotation water intake port during forward rotation of the impeller. Is sucked from the passage hole into the normal rotation pump chamber and sent to the normal rotation discharge port, and when the impeller rotates in the reverse direction, the fluid from the reverse rotation water intake port is sucked into the reverse rotation pump chamber to reverse the reverse rotation. The pump according to claim 1, wherein the pump is delivered to a discharge port. 3. In the pump section, the normal rotation pump chamber partitioned by a partition wall is arranged in an upper portion, the reverse rotation pump chamber is arranged in a lower portion, and the reverse rotation impeller is arranged in the reverse rotation pump chamber. The pump according to claim 1 or 2, wherein the pump is provided. 4. The pump according to claim 1, wherein the normal rotation discharge port is opened toward the upper side of the pump. 5. A substantially cylindrical guide for guiding the fluid from the forward rotation water intake port to the forward rotation pump chamber opening is provided in the opening of the forward rotation water intake port around the passage hole of the reverse rotation vane. The pump according to any one of claims 1 to 4, wherein the pump is provided for the pump. 6. The pump according to claim 1, wherein the partition wall has a stepped structure having a step on the peripheral portion of the rotary shaft and an outer peripheral portion thereof. 7. A filling part for preventing air accumulation is provided in a space between the upper part of the normal rotation blade and the normal rotation pump chamber. Pump. 8. The pump according to claim 1, wherein the motor section constitutes a brushless DC motor. 9. The pump according to claim 1, wherein the blade for forward rotation is a fugal type and the blade for reverse rotation is a wesco type. 10. The pump according to claim 9, wherein the normal rotation blade is a semi-open type. 11. A dishwasher having a built-in pump for supplying washing water to a washing tank and sending the waste water after washing to a drain port, wherein the pump is the pump according to any one of claims 1 to 10. A dishwasher characterized in that