JP2003097495A - Pump and dish washer using the pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively provide a dish washer for reducing noise, reducing a size, having high performance, and having a long service life. SOLUTION: This pump is used for the dish washer for sending waste water after washing to a drain port by supplying wash water to a cleaning nozzle. The pump is a reversible pump for integrally constituting a motor part 30 having a suction port 31, and a pump part 50 having two delivery ports 51 and 52, having the motor part 30 for rotatably arranging a rotor 33 having a magnetic substance 41 on the inner periphery of a stator 32, and arranging a flowing water passage 34 from the suction port 31 in the vicinity of a shaft of the rotor 33, and having the pump part 50 for supplying water flowing from the flowing water passage 34 to the cleaning nozzle at normal rotation time of an impeller 43 arranged on the rotor 33, and sending the water flowing from the flowing water passage 34 to the drain port at reverse rotation time of the impeller 43.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher using a reversible pump having a function of supplying washing water for washing dishes to a washing nozzle and discharging dirty washing water to the outside of the machine. .

[0002]

2. Description of the Related Art Generally, a dishwasher uses one pump to spray washing water on dishes set in a washing room,
The waste water after washing is discharged to the outside of the pump machine, and the pump used in the dishwasher has the function of pumping the washing water to the washing nozzle and spraying it toward the dishes when washing the dishes. A reversible pump having a function of discharging the dirty water after washing out of the machine is generally used.

In a conventional reversible pump, one pump has two discharge ports, and the fluid sucked from the water suction port is sent to one of the discharge ports according to the switching between the forward rotation and the reverse rotation of the motor. It is equipped with two types of impellers, a forward rotation impeller and a reverse rotation impeller, which are connected to a reversible motor. When the motor rotates in the forward direction, the aquarium of the dishwasher sucked from the water inlet by the rotating action of the forward rotation impeller. When washing the dishes by pumping the washing water of the above from one discharge port to the washing nozzle and draining the waste water after washing out of the machine, the motor is operated in reverse and the impeller for reversing rotates to rotate the dishwasher. The sewage collected in the water tank is sucked from the water intake port and discharged to the outside of the machine through the other discharge port.

The above-mentioned reversible pump requires a large-scale drive system for satisfying the discharge functions of two types of impellers, a complicated flow path and a pump structure, which makes the pump expensive and makes it difficult to make the pump structure compact. There is a problem that the size of the pump becomes large and it is difficult to reduce the cost and size of the dishwasher incorporating the pump.

Further, in the conventional reversible pump, two types of impellers are temporarily stopped when the rotation direction of the motor is switched, so that air intrudes into the pump during that time, so-called "air blur" occurs. However, there is a problem that noise is generated due to air bubbles mixed during pump operation and pump performance is deteriorated.

Further, a pump used in a dishwasher is often arranged below the device, and in a pump having a conventional steel plate outer shell, the stator is deteriorated due to water leakage from the seam of the steel plate or dew condensation due to moisture, and deterioration of the stator. It may cause a short circuit and has a problem with durability.

[0007]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems and to reduce the size and noise of the dishwasher and to reduce the cost of a long-life dishwasher which improves the washing performance. It is intended to be provided.

[0008]

According to a first aspect of the present invention, there is provided a pump for use in a dishwasher which supplies cleaning water to a cleaning nozzle and sends the dirty water after cleaning to an outlet, the pump comprising:
A motor unit having a water intake port and a pump unit having two discharge ports are integrally formed, and in the motor unit, a rotor having a magnetic body is rotatably arranged on an inner circumference of a stator, and A water passage from the water inlet is provided in the vicinity of the axis of the rotor, and in the pump portion, water flowing from the water passage is supplied to the cleaning nozzle during normal rotation of an impeller provided on the rotor. However, the pump is a reversible pump that sends the water flowing from the flowing water channel to the discharge port when the impeller is rotated in the reverse direction.

A second aspect of the present invention is the pump according to the first aspect, wherein the pump is a reversible pump having a sensorless drive type circuit built in the motor section.

A third aspect of the present invention is the pump according to the first or second aspect, wherein the pump is a reversible pump in which a stator of the motor section is molded with a molding resin.

According to a fourth aspect of the present invention, there is provided a dishwasher having a pump for supplying the washing water to the washing nozzle and sending the wastewater after washing to the discharge port, wherein the pump is any one of the first to third aspects. It is a reversible pump of statement, It is a dishwasher characterized by the above-mentioned.

A fifth aspect of the present invention is the dishwasher according to the fourth aspect, wherein the reversible pump is provided at the bottom of the dishwasher.

The pump used in the dishwasher of the present invention is
By using one type of impeller, you can select two discharge ports by the normal and reverse rotation of the motor, supply cleaning water to the cleaning nozzle during normal rotation, and drain wastewater out of the machine during reverse rotation. It is a reversible pump that can. This simplifies the driving method and internal structure of the pump, giving you more freedom in designing the supply of cleaning water and the direction of drainage, which reduces the cost and size of the dishwasher and improves cleaning performance. it can. Furthermore, there is no "air stain" inside the pump,
The noise of the pump can be reduced, the performance can be improved, and the quietness and reliability of the dishwasher can be improved.

Further, when the reversible pump is a pump having a sensorless drive type circuit built in the motor part, a rotor detection sensor such as a hall element is not required in the motor part of the pump. Since the cost of the pump can be reduced, the cost of the dishwasher using the pump can be reduced.

Further, in the reversible pump of the third aspect, since the stator and the electric components around the stator are molded, the water resistance is improved and deterioration and short circuit can be prevented.

Therefore, in the dishwasher according to the fourth aspect, it is possible to obtain a dishwasher which is low in cost, which reduces noise and can be downsized, and which has a long life.

Further, when the pump is provided at the bottom of the dishwasher as described in claim 5, the degree of freedom in the piping design of the supply route and the drainage route of the wash water is increased, and the performance of the dishwasher is improved. Further improvement and miniaturization can be achieved.
Furthermore, if the stator is molded, the durability of the pump can be improved and the dishwasher can have a long life, even at the bottom of a humid apparatus.

[0018]

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

FIG. 1 is a schematic view showing the structure of a dishwasher 1 of the embodiment. As shown in the figure, the dishwasher 1 sets a washing room 11 in a closed state provided with a door (not shown) which can be opened and closed in the front, and dishes 13 placed on a table 12 in the washing room 11. The rack 14, a water tank 17 for collecting and storing the wash water 15 and the dirty water 16 after washing, and an injection hole 19 for the wash water 15 provided in the upper center of the washing chamber 11.
And a reversible pump 2 for supplying the cleaning water 15 to the cleaning nozzle 18 and discharging the cleaned waste water 16 to the outside of the machine, and a drying fan 21 for drying the tableware 13 after cleaning. A control circuit 22 for controlling the washing process of washing, rinsing and drying is housed in the main body of the dishwasher 1, and a water supply pipe 23 for supplying the washing water 15 to the water tank 17 and a drain pipe 24 for draining dirty water are provided. It is connected to the reversible pump 2.

The dishwasher 1 having the above-mentioned structure is used for the tableware 1
After arranging the rack 14 storing 3 in a predetermined position on the table 12, a predetermined amount of cleaning water 15 is supplied from the water supply pipe 23 to the water tank 17 containing the detergent, and the operation is started.

First, the cleaning water 15 sucked from the water suction port 31 by the normal operation of the reversible pump 2 is discharged from one discharge port 51 of the reversible pump, and the supply pipe 2 is supplied.
0 to the cleaning nozzle 18 under pressure and sent to the injection hole 19
Is sprayed onto the tableware 13 to wash the cumulative tableware 13.

When the cleaning is completed, the reversible pump 2 is operated in the reverse direction, and the cleaned waste water 16 collected in the water tank 17 is sucked from the water intake port 31 and discharged from the other discharge port 52 through the drain pipe 24. It is discharged outside. Similarly, the cleaning is repeated a predetermined number of times, and the cleaning process is completed.

Subsequently, the rinsing process is the same operation as the above-mentioned cleaning process, but the water containing the detergent is not used as the cleaning water, and the tap water stored in the water tank 17 is injected by the normal operation of the reversible pump 2. The residue of the detergent or food that has been sprayed from the nozzle 18 and adhered to the tableware 13 is washed away, and the sewage collected in the water tank 17 by the reverse operation of the reversible pump 2 after completion of rinsing is discharged from the drainage pipe 24 to the outside of the machine.

When the cleaning and rinsing steps are completed, the cleaning chamber 1
The drying fan 21 provided on the side wall of No. 1 operates, the warm air circulates in the washing chamber 11, the dishes are dried, and a series of dish washing steps is completed.

The control circuit 22 controls the operation of the reversible pump 2, the amount of water, the washing time, the temperature, etc. in a series of dish washing steps.

FIG. 2 is a vertical sectional view of the reversible pump 2 used in the dishwasher 1, and FIG. 3 is a plan view thereof.

The reversible pump 2 comprises a motor section 30 having a water suction port 31 and a pump section 50 having two discharge ports 51 and 52. A casing (A) 71 and a casing (B) 72 sandwich a packing 73. The pump is sealed to form a vertical unit.

The motor section 30 includes a stator 32 provided on the outer periphery of a casing (A) 71, and a rotor (33) rotatably in a casing (A) 72 on the inner periphery of the stator 32.

The stator 32 is composed of an iron core 35 and a winding 36, a circuit board 37 for driving a motor is arranged, and the whole is molded by a molding resin 38 made of a thermoplastic resin and is housed in the resin, and is waterproof. The durability and durability of the pump is greatly improved by preventing deterioration of the stator and the occurrence of short circuits by improving the insulation and insulating properties.

The rotor 33 has a permanent magnet 41 connected to the bearing 39 via a connector 40 and an impeller 43 connected to the bearing 39 so as to rotate in the pump 50. The water flow passage 34 is formed in parallel with.

The rotor 33 has a casing (A) 71.
The shaft support portion 73 is provided with a thrust washer, and is rotatably attached to the support shaft 42 supported between the shaft support portions 74 of the casing (B) 72 via the bearing portion 39.

The pump section 50 discharges the water sucked from the water suction port 31 and flowing through the flow passage 34 by the rotating action of the impeller 43 (or another discharge pipe 5 not shown).
4) and discharges from the discharge port 51 (or 52) to the outside of the pump.

The water path in the pump unit 50 will be described with reference to the plan view of FIG. 3 and the schematic cross-sectional view of FIG. 4 for explaining the water path in the dishwasher 1.

The pump section 50 is divided into a first flowing water channel 65 and a second flowing water channel 67 centered on the pump chamber 55 by the casing outer wall 57 of the casing (B) 72 and the casing inner wall 56 provided inside the casing (B) 72. It is connected to a casing (A) 71 (not shown) sandwiching (not shown).

On the inner wall 56 of the casing, the pump chamber 5
The first discharge groove 61 and the second discharge groove 63 from 5 are opened,
The first flowing water channel 65 and the second flowing water channel 67 are connected to the first discharging pipe 53 and the second discharging pipe 54, respectively.

A predetermined number of blades 44 (see FIG. 3) are provided in the pump chamber 55.
The rotatable impeller 43 having 12 blades mounted therein is housed, and the water flowing from the water flow passage 34 is swirled in the pump chamber 55 in a predetermined direction by the centrifugal action of the rotation of the impeller 43. generate.

During normal rotation of the rotor 33, as shown in FIG.
As shown in (a) and FIG. 4 (a), the cleaning water 15 in the water tank 17 sucked into the reversible pump 2 is absorbed by the water intake port 3.
1 through the flowing water passage 34, and the normal rotation of the impeller 43 generates a counterclockwise swirling flow 60 in the pump chamber 55.
It flows through the discharge groove 61 and is discharged from the pump chamber 55 as running water 62, and is discharged through the first discharge pipe 53 to the first discharge port 51.
Is discharged from the reversible pump 2 with water pressure,
It is sent to the wash water supply pipe 20 and jetted from the jet nozzle 18.

At the time of this normal rotation, the opening of the second discharge groove 63 is opened at an acute angle with respect to the swirl flow 60, so the swirl flow 60 is pushed by the water pressure thereof and enters the second discharge groove 63. However, since the cleaning water 15 is discharged only from the first discharge groove 61 to the outside of the pump chamber 55, the cleaning water 15 is sent only to the injection nozzle 18 and discharged from the drainage port 24 following the second discharge groove 63 to the outside of the machine. There is no such thing.

The normal operation of the reversible pump 2 is as follows.
Operates in the dishwashing and rinsing process.

During the reverse rotation of the rotor 33, as shown in FIGS. 3 (b) and 4 (b), the waste water 16 in the water tank 17 after being sucked by the reversible pump 2 is
A clockwise swirling flow 64 is generated in the pump chamber 55 by the reverse rotation of the impeller 43, flowing through the water inlet 34 from the water suction port 31, passing through the second discharge groove 63, and flowing water 6 from the pump chamber 55.
6 is discharged, is sent from the second discharge port 52 to the drain pipe 24 via the second discharge pipe 54, and is discharged to the outside of the machine.

Even during this reverse rotation, the opening of the first discharge groove 61 is opened at an acute angle with respect to the swirl flow 64, similarly to the above, so that the swirl flow 64 is pushed by the water pressure and the first discharge groove is formed. 61 cannot flow into the first discharge groove 61 and flow out from the first discharge groove 61.
Since it is discharged outside, the wastewater 16 is sent only to the drain pipe 24. Therefore, since it is not sent to the spray nozzle 18, the washed dishes are not re-contaminated.

The reverse operation of the reversible pump 2 is as follows.
It is operated in the drainage process of sewage after washing and rinsing dishes.

In the tableware drying process after washing, the reversible pump 2 is stopped.

Furthermore, if the sensorless drive type drive circuit as shown in the block diagram of FIG. 5 is used as the drive circuit of the motor drive circuit board 37, the hall element for detecting the rotor becomes unnecessary, and the reversible pump The cost is reduced and the cost of the dishwasher using the same can be reduced.

Further, since the electric components such as the stator and the drive circuit board are molded with the molding resin, the water resistance of the motor part is improved and the pump part of the pump is improved even if it is arranged on the bottom part of the dishwasher with high humidity. The durability is improved and the life of the dishwasher can be extended.

The reversible pump 2 includes an impeller 1
By selecting the type, it is not necessary to switch the drive system of the motor section or the drive transmission of the two types of impellers, and the internal structure of the reversible pump can be simplified and made compact, so that the cost can be reduced and the size of the reversible pump can be reduced. Can be realized.

Furthermore, since "air leakage" in the reversible pump is eliminated, problems such as noise generated by agitation of air bubbles in the fluid and deterioration of discharge performance due to the mixture of air bubbles are solved, and noise reduction of the pump is achieved. The performance can be improved.

Further, since it becomes easy to change the flow channel in the reversible pump, the position of the discharge port and the discharge direction can be selected, and the pipes arranged in the dishwasher can be easily handled, and the flexibility of the pipe design can be improved. Becomes higher and the embeddability in the product also improves.

Therefore, the dishwasher using the above-mentioned reversible pump is low in noise and small in size, and has a high degree of freedom in designing piping for water supply and drainage of cleaning water. It can be offered at a low price.

[0050]

As described above, in the dishwasher of the present invention, the noise of the reversible pump is reduced from the conventional two types to reduce the noise of the reversible pump, and further, the driving method of the impeller and the internal structure of the reversible pump are reduced. By using a reversible pump that can be made smaller and cost-effective by improving and making it compact, it is possible to obtain a low-noise, small-sized, high-performance, long-life dishwasher at low cost. .

[Brief description of drawings]

FIG. 1 is a schematic diagram of the structure of a dishwasher.

FIG. 2 is a vertical cross-sectional view of the reversible pump of the embodiment.

FIG. 3 is a plan view of the reversible pump of the embodiment.

FIG. 4 is a schematic diagram illustrating a water path of the dishwasher of the embodiment.

FIG. 5 is a block diagram of a sensorless drive type drive circuit according to an embodiment.

[Explanation of symbols]

1 ... Dishwasher 2 ... Reversible pump 30: Motor part 31 ... Water inlet 32 ... Stator 33 ... rotor 34 ... Flowing channel 41 ... Magnetic material 43 ... Impeller 50 ... Pump section 51, 52 ... Discharge port

Claims (5)

[Claims] 1. A pump for use in a dishwasher, which supplies washing water to a washing nozzle and sends the dirty water after washing to an outlet, wherein the pump has a motor part having a water inlet and two outlets. And a pump unit having a unit, and in the motor unit, a rotor having a magnetic material is rotatably arranged on an inner circumference of a stator, and water flowing from the water suction port near a shaft of the rotor. A passage is provided, and in the pump section, water flowing from the flowing water channel is supplied to the cleaning nozzle when the impeller provided to the rotor is normally rotated, and water is flowed from the flowing water channel when the impeller is reversed. A pump, which is a reversible pump that sends the received water to the discharge port. 2. The pump according to claim 1, wherein the pump is a reversible pump having a sensorless drive type circuit built in the motor unit. 3. The pump according to claim 1, wherein the pump is a reversible pump in which a stator of the motor unit is molded with a molding resin. 4. A reversible pump according to claim 1, wherein the dishwasher has a pump for supplying cleaning water to a cleaning nozzle and sending the waste water after cleaning to an outlet. Dishwasher characterized by being. 5. The dishwasher according to claim 4, wherein the reversible pump is provided at the bottom of the dishwasher.