JPH0910159A - Dish washing machine - Google Patents

Abstract

PURPOSE: To provide a dish washing machine which has an improved washing efficiency by jetting washing water from a jetting drum efficiently toward dishes in a dish basket while preventing a drop in efficiency of a washing pump caused by air which enters the washing water in a water reservoir part within a washing tank due to the washing water jetted out of the jetting drum. CONSTITUTION: A reciprocal rotation range of a jetting drum 5 provided with a nozzle hole 6 is set within a range of angle that allows washing water jetting out of the nozzle 6 to hit dishes 10 alone and the jetting drum 5 rotates reciprocatingly within the range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher for washing dishware stored in a washing tank by spraying washing water.

[0002]

2. Description of the Related Art FIG. 11 is a sectional view showing the structure of a conventional dishwasher having a cylindrical injection drum. In the figure, 1 is a main body case with an open upper portion, 3 is a cleaning tank attached to the main body case 1, and 2 is a lid which is openably and closably attached to an upper opening portion of the main body case 1. 9 is tableware 1
A tableware basket 0 for storing 0 and a water supply valve 23 attached to the cleaning tank 3 are opened and closed when a predetermined amount of water is supplied to the water pool 4. A heater 18 is fixed below the normal water level in the lower portion of the cleaning tank 3, and a drain valve 21 is provided at the bottom of the cleaning tank 3.
And a drain hose 22 is attached. Reference numeral 7 denotes a cleaning pump arranged at the outer lower portion of the cleaning tank 3, the water supply side is connected to the water pool 4, and the water supply side is connected to the cylindrical injection drum 5 by a water supply hose 24. An O-ring that also serves as a bearing member prevents water from leaking from the connecting portion.

Next, the injection drum 5 will be described. A plurality of nozzle holes 6 are provided on the outer peripheral surface of the cylindrical jet drum 5, and the pressurized water from the cleaning pump 7 is jetted from the nozzle holes 6. Then, the worm gear 12 mounted on the drum motor 11 and the worm wheel 13 fixed to the injection drum 5 mesh with each other, and the injection motor 5 is rotated by the drum motor 11.

In the dishwasher configured as described above, in order to wash the dishes 10 placed in the dish basket 9, the water supply valve 23 is first opened to wash the water pool 4 in the washing tank 3 with a predetermined amount. Supply water. The cleaning water accumulated in the water pool 4 is sent to the injection drum 5 by the cleaning pump 7. Further, the injection drum 5 is driven by the drum motor 11 so that
The washing water is sprayed from the nozzle hole 6 toward the dishes 10 in the dish basket 9 while performing full rotation through the worm gear 12 mounted on the No. 1 and the worm wheel 13 fixed to the jet drum 5. Then, the wash water that has washed the tableware 10 gathers again in the water pool 4, passes through a filter (not shown), and is then sent to the injection drum 5 again to wash the tableware 10.

After a lapse of a predetermined time, the cleaning pump 7 is stopped, the drain valve 21 is opened, and the cleaning water in the water pool 4 is discharged to the outside of the main body case 1 by the drain hose 22. Supply new washing water to the water pool 4 again to drive the washing pump 7,
After rinsing and washing, the washing water is discharged from the discharge valve 21. Finally, the heater 18 is energized to blow warm air into the washing tank 3 to dry the dishes 10. After drying, cover 2
Then, the tableware 10 is released from the tableware basket 9 to the outside of the main body case 1, the filtration filter (not shown) is removed, the residual foods collected in the filter are discarded, and the tableware 10 is set again in the water pool 4.

[0006]

In the conventional dishwasher as described above, a plurality of nozzle holes 6 are provided on the entire outer peripheral surface of the injection drum 5 so that the dishes 10 are always washed by full rotation. , The sprayed cleaning water first hits the tableware 10, then the inner rear surface, the bottom surface, and the inner front surface of the main body case 1, and in the full rotation cleaning, not only the tableware 10 but also the inner surface of the main body case 1 is cleaned. The water hits and the cleaning efficiency of the tableware 10 is poor, and the injection of the cleaning water onto the bottom surface of the main body case 1 blows a large number of bubbles (air) into the cleaning water in the water pool 4, and the flow rate at the time of injection is air. There is also a problem in that the volume of the fluid containing the water is reduced, the output of the water pressure and the flow rate is reduced, and the efficiency of the cleaning pump 7 is reduced.

Also, in the case of washing dishes by fully driving the jetting drum 5, the interval from when the washing water is sprayed from one nozzle hole 6 to hit the dish 10 until the washing water sprayed from the nozzle hole 6 next hits the dish 10 Is empty,
If the speed of the full rotation drive of the injection drum 5 is increased in order to shorten the time until it hits the dishes 10, the dishes 1 of the wash water
Although the number of sprays to 0 increases, there is a problem in that the amount of wash water sprayed per unit area that hits the tableware 10 decreases and the energy density of the wash water that hits the tableware 10 drops.

Further, since the bearing member on the water supply side, which is the rotating shaft of the injection drum 5, has a seal structure for preventing water leakage, the load on the bearing member becomes large, and water leakage due to wear of the seal material and the like. There was a problem that would occur.

The present invention has been made in order to solve the above-mentioned problems, in which the rotation drive range of the spray drum is a reciprocating drive within the range in which the sprayed cleaning water hits the dishes, and the cleaning water is applied only to the dishes. In addition, the operation of repeating small reversal is further performed during the reciprocating drive within the above range to perform the injection in which the injection energy of the wash water is concentrated to obtain the dishwasher with a high dishwashing efficiency.

Another object of the present invention is to obtain a dishwasher in which the water supply side bearing portion of the injection nozzle is a lightly loaded bearing portion with less friction.

[0011]

In a dishwasher according to the present invention, a plurality of nozzle holes for injecting washing water into a dish in a dish basket stored in a washing chamber through a washing pump are provided at predetermined positions on the peripheral surface. The injection drum is provided at the both ends, and the injection drum is reciprocatingly rotated within a range of a predetermined angle with both ends as rotation axes.

Further, the injection drum repeats the reciprocating rotation operation at an angle smaller than the predetermined rotation angle within the range of the predetermined rotation angle.

Further, the injection drum makes full rotation immediately before the rotation operation is stopped.

Further, one end of the injection drum is connected to a drum motor and the other end is fitted and inserted into a holder connected to the cleaning pump, and cleaning water flows into a fitting insertion portion between the holder and the injection drum. A gap having a predetermined width is provided.

[0015]

In the dishwasher configured as described above, the spray drum is controlled so as to reciprocate within a range of a predetermined angle to rotate, and the cleaning water sprayed from the nozzle holes provided in the spray drum is controlled. Apply only to the dishes and wash.

Further, the jetting drum repeats the reciprocating rotation operation within the range of the predetermined rotation angle at an angle smaller than the predetermined angle, and the washing water jetted from the nozzle hole is applied to only the dishes to wash.

Further, the jetting drum is fully rotated immediately before the turning operation is stopped to wash the dishes and the inside of the washing tank at the same time.

Further, the cleaning water is prevented from flowing into the gap between the one end of the jetting drum and the holder so that the jetting drum and the holder do not come into direct contact with each other.

[0019]

【Example】

Embodiment 1 FIG. 1, 2 and 3 are front sectional views, II-II sectional views and II showing a dishwasher which is an embodiment of the present invention.
It is an I-III sectional view. In the figure, reference numeral 1 is a main body case having an open top, and a lid 2 is provided at the opening. 3
Is a cleaning tank which is provided in the body case 1 with a water pool portion 4 provided at the bottom.

Reference numeral 5 denotes an injection drum provided in the lower portion of the cleaning tank 3, which has a cylindrical shape such as a cylindrical shape, a rectangular cylindrical shape, or a rectangular cylindrical shape. A plurality of nozzle holes 6 are arranged in the axial direction at substantially equal intervals. It is provided on a straight line. One end of the injection drum 5 is connected to the nozzle holder 8 which is fixed to the cleaning tank 3 and also serves as a water supply port to the injection drum 5, the other end is closed, and the worm wheel 13 is attached with a screw 15. . 12
Is a worm gear, which meshes with the worm wheel 13 and is fixed to the output shaft of the drum motor 11. 14
Is a fan-shaped sensor plate, and the end of the ejection drum 5 is attached with a screw 15. Reference numeral 16 is an optical sensor that constitutes a drum position detecting means, and is attached to the cleaning tank 3 corresponding to the sensor plate 14.

9 is a dish basket which is placed in the washing tank 3 and in which the dishes 10 to be washed are placed, 18 is a heater provided in the water reservoir 4, 23 is a water supply valve, and is connected to a tap of a water supply or the like. The cleaning tank 3 can be supplied with water. 24 is a water supply hose whose one end is connected to the water reservoir 4 and the other end is connected to the cleaning pump 7, 25 is one end connected to the water supply side of the cleaning pump 7 and the other end is connected to the water supply side of the nozzle holder 8. It is a water supply hose. Reference numeral 22 denotes a drainage hose whose one end is connected to the water reservoir 4, and drainage is taken out of the main body case 1 through the drainage hose 22 through the drainage valve 21.

Next, the operation of the dishwasher configured as described above will be described. First, the lid 2 is opened, the dish 10 to be washed is placed in the dish basket 9, detergent is added, and the lid 2 is closed. Next, the cleaning water is supplied from the water supply valve 23 into the cleaning tank 3, and when the water pool 4 reaches a predetermined water level, the water supply is stopped,
The heater 18 is energized to heat the wash water to a predetermined temperature.

Next, the reversing operation of the injection drum 5 will be described. At the same time when the heater 18 is energized, the drum motor 11 and the washing pump 7 are also energized to supply the washing water pressurized by the washing pump 7 from the water reservoir 4 to the jet drum 5 and rotate the jet drum 5. Injection drum 5
When is rotated, the sensor plate 14 attached to the ejection drum 5 is also rotated and moved at the same time (see FIG. 3), and when the end of the sensor plate 14 comes off the optical sensor 16, the optical sensor 16 detects light from a lamp (not shown). Then, the drum position detecting means outputs an inversion signal. FIG. 4 is a block diagram showing a part of an electric circuit of the dishwasher. When the inversion signal is output, the microcomputer inverts the rotation of the drum motor 11 to execute the inversion operation of the injection drum 5. . When the ejection drum 5 rotates in the reverse direction, the sensor plate 14 rotates until it reaches the other end. Then, the end portion of the sensor plate 14 is disengaged from the optical sensor 16 again, and the drum position detecting means outputs an inversion signal to execute the inversion operation. By continuing such a continuous reversing operation of the spray drum 5 and spraying wash water from the nozzle holes 6 of the spray drum 5 for a certain period of time, the tableware 1
Wash 0.

FIG. 5 and FIG. 6 are cross-sectional views of the jetting water showing the trajectory of the washing water 26 when such an inversion operation of the jetting drum 5 is performed, and a schematic view of the flow of the washing water 26 jetted from the nozzle holes 6. The nozzle hole 6 reciprocates like a locus 33, and the washing water 26 concentrates on the dishes 10 to wash them. The washing water sprayed from the nozzle hole 6 to wash the dishes 10 is collected in the water pool portion 4, again pumped by the washing pump 7 and jetted from the nozzle hole 6 to circulate.

The angle of the reversing operation of the jetting drum 5 can be set by changing the size of the central angle of the sensor plate 14, and the point is to set the angle so as to hit the entire tableware 10 and the angle. It can be freely set to be narrow or wide.

In the first embodiment, the sensor plate 14 is constructed so as to block the light to the optical sensor 16 in the operating range of the ejection drum 5, but conversely, it may be controlled so as to detect the light in the operating range. good. As for the rotation system of the injection drum 5, the structure may be such that it is directly connected to the motor shaft without using a gear.

In the washing operation of the dishwasher, when the time set by the shape, amount, etc. of the dishes 10 to be washed has elapsed, the drum motor 11 and the washing pump 7 are stopped, the drain valve 21 is driven, and the water sump portion is driven. The cleaning water in the inside of the table 4 is discharged from the drain hose 22 to the outside of the main body case 1,
Washing is completed.

Next, rinsing is performed. Washing tank 3 again
Water is supplied to the water pool portion 4 inside, the drum motor 11 and the cleaning pump 7 are driven, and the cleaning water is sprayed from the nozzle hole 6 of the spray drum 5 to the tableware 10 to rinse and after a predetermined time has passed. The drum motor 11 and the cleaning pump 7 are stopped, and the drain valve 21 is driven to discharge the cleaning water in the water reservoir 4 to the outside of the main body case 1. Such rinsing is repeated several times (for example, 3 times). The rotation of the jetting drum 5 in this rinsing and washing operation is repeated by the drum position detecting means in the same manner as in the above washing operation. After the rinsing is completed, the heater 18 is energized and warm air is blown to the dishes 10 by a blower '(not shown) to perform drying.

Example 2. In the second embodiment, as shown in the cross-sectional view of the jet drum 5 showing the trace of the washing water in FIG.
While repeating the reciprocating reciprocating operation at an angle smaller than the predetermined angle of the reversing operation of the ejecting drum 5 in the above (hereinafter referred to as small reversing), the reciprocating reciprocating operation is performed within the predetermined range of the ejecting drum 5 to wash the dishes 10. There is.

The reciprocating reciprocation of the jet drum 5 will be described. One of the sawtooth-like traces 34 of the cleaning water shown in FIG. 7 is one reciprocating reciprocating movement at an angle smaller than a predetermined angle, and this small reversing reciprocating operation is performed at least twice or more within the predetermined range of the first embodiment. To do so. FIG. 8 shows a control flowchart of such a reciprocating reciprocating operation. In the figure, first, the drum motor 11 starts and the jet drum 5 rotates forward. After the lapse of 3 seconds (37), the injection drum 5 rotates in the reverse direction. Next, after 1 second of reverse rotation (38), if the position detection signal (reverse signal) of the injection drum 5 is not input, the injection drum 5 advances in the forward rotation direction and one small reverse reciprocating operation is performed. become. This reciprocating reciprocating operation is repeated until the position detection signal (reversal signal) of the ejection drum 5 is input. If the position detection signal (reversal signal) of the ejection drum 5 is input, one of the reversing operations within a predetermined range is performed. The process is complete. While repeating this operation, the washing water is sprayed and the dishes 10
Is performed.

Next, the action of the water flow will be described. FIG.
6 is a schematic view of the water flow of the cleaning water sprayed from the nozzle holes 6 of the spray drum 5, and is one of the cleaning water 26 of the schematic view of the water flow of the wash water from the spray drum 5 that does not perform the small reversing reciprocating operation in FIG. If the unit volume (polka dot) is the polka dot 35 of FIG. 9, the polka dots 35 are concentrated in the small reversing reciprocating motion. That is, as compared with the water flow that does not perform the small reversal reciprocating operation in FIG. 6, the energy of the water flow at the reversing point can be increased by the small reversing reciprocating operation, and the cleaning power becomes stronger.

Embodiment 3 FIG. In addition, the first or second embodiment
Then, the spray drum 5 at the time of washing and rinsing the dishes 10
In the reciprocating reciprocating operation, the cleaning water was sprayed within the range of the predetermined rotation angle. However, by rotating the spray drum 5 to the full rotation for a certain time in the cleaning and rinsing process, the tableware 1
The cleaning of the cleaning tank 3 may be performed simultaneously with the cleaning of 0. The output of the inverted signal by the optical sensor 16 at this time is made invalid by the microcomputer,
The jet drum 5 is fully rotated.

In the dishwasher configured as described above, for example, the output of the reversal signal by the optical sensor 16 during the last fixed time (for example, 2 to 3 minutes) of the reciprocating reciprocation of the ejection drum 5 is invalidated by the microcomputer. The cleaning water sprayed from the nozzle holes 6 is also sprayed to the side surfaces and the bottom surface of the tableware 10 and the cleaning tank 3, and the spray drum 5 is rotated for a certain period of time. The inside of the cleaning tank 3 is simultaneously cleaned by all rotations.

Embodiment 4 FIG. Further, as shown in FIG. 10, a gap 40 having a predetermined width is provided in a fitting portion between the nozzle holder 8 and one end of the ejection drum 5 which is rotatably fitted, and the cleaning pump 7 is used for cleaning. Water 30 is water supply hose 2
5, when the nozzle holder 8 and the rotating jet drum 5 flow, the water flow of the washing water 30 is jetted into the washing tank 3 from the nozzle holes 6 by the water pressure, and the water is positively introduced into the gap 40. , The water flow allows the gap 40 to always maintain a predetermined distance during the rotating operation,
Stable rotation of the injection drum 5 with little wear is performed.

[0035]

Since the present invention is configured as described above, the spray drum is reciprocally rotated at an angle at which the washing water sprayed from the nozzle holes hits only the dishes, and the spray drum is completely rotated. The washing water is more concentrated on the dishes than the rotating washing, and the washing effect of the dishes is good, and since the washing water is not sprayed directly to the water sump, air does not enter the washing water in the water sump. It is possible to prevent the function of the washing pump from being deteriorated.

Further, since the jetting drum repeats the reciprocating rotation operation within the range of the predetermined rotation angle at an angle smaller than the predetermined rotation angle, only the tableware is contacted with the washing water and the angle smaller than the predetermined rotation angle. At the time of turning, the washing water is sprayed on the dishes with more concentrated water flow energy, and a dishwasher with a higher dishwashing effect can be obtained.

Further, since the spray drum is rotated all the way immediately before the rotation of the spray drum is stopped, only the tableware is rinsed with the cleaning water, and at the same time, the cleaning water is washed during the entire rotation. The inside of the cleaning tank can also be sprayed by spraying inside the tank.

Further, by providing a gap into which the cleaning water flows in between one end of the injection drum and the holder and ensuring this gap by the inflow of the cleaning water, there is no direct contact between the injection drum and the holder. Therefore, it is possible to perform stable rotation of the injection drum with little wear and a long life under a light load.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a dishwasher according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG. 1 showing a dishwasher which is an embodiment of the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG. 1 showing a dishwasher which is an embodiment of the present invention.

FIG. 4 is a block diagram showing a part of an electric circuit of the dishwasher which is an embodiment of the present invention.

FIG. 5 is a cross-sectional view of the spray drum showing the trajectory of the wash water from the spray drum of the dishwasher according to the embodiment of the present invention.

FIG. 6 is a schematic diagram of the flow of wash water from the spray drum of the dishwasher that is an embodiment of the present invention.

FIG. 7 is a cross-sectional view of the spray drum showing the trajectory of the wash water from the spray drum of the dishwasher showing the second embodiment of the present invention.

FIG. 8 is a rotation control flowchart of an injection drum of a dishwasher showing a second embodiment of the present invention.

FIG. 9 is a schematic diagram of the flow of wash water from the spray drum of the dishwasher showing the second embodiment of the present invention.

FIG. 10 is a cross-sectional view of essential parts of a dishwasher showing a fourth embodiment of the present invention.

FIG. 11 is a front cross-sectional view showing a conventional dishwasher.

[Explanation of symbols]

1 body case, 2 lid, 3 cleaning tank, 4 water pool,
5 injection drums, 6 nozzle holes, 7 washing pumps, 8 nozzle holders, 9 tableware baskets, 10 tablewares, 11 drum motors

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takashi Sato 1728-1, Koeda, Oaza-gun, Hanazono-cho, Osato-gun, Saitama Prefecture Mitsubishi Electric Home Equipment Co., Ltd.

Claims (4)

[Claims] 1. An injection drum having a plurality of nozzle holes for injecting washing water into a dish housed in a dish basket stored in a washing chamber through a washing pump at predetermined positions on the circumferential surface, and the jet drum has both end portions. A dish washer characterized in that the dish washer is reciprocally rotated within a range of a predetermined angle around the rotation axis. 2. The dishwasher according to claim 1, wherein the jetting drum repeats reciprocating rotation operation at an angle smaller than the predetermined rotation angle within the range of the predetermined rotation angle. 3. The dishwasher according to claim 1, wherein the injection drum makes a full rotation immediately before the rotation operation is stopped. 4. One end of the injection drum is connected to a drum motor and the other end is fitted into a holder connected to the cleaning pump, and cleaning water flows into a fitting insertion portion between the holder and the injection drum. The dishwasher according to any one of claims 1 to 3, wherein a gap having a predetermined width is provided.