JP2734757B2 - Dishwasher - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a dishwasher used in ordinary households.

2. Description of the Related Art Conventionally, a general configuration and operation method of a dishwasher of this type will be described with reference to FIG. After storing tableware, cooking utensils and the like in a predetermined place of the tableware basket 1 and arranging them in the washing tank 2, when a detergent is added and operation is started, first, the water supply valve 3 is operated and a predetermined amount of washing water 10 is discharged. It is supplied into the cleaning tank 2.
Subsequent to the water supply step, a main cleaning step is performed in which the cleaning water 10 pressurized by the cleaning pump 4 is injected together with the detergent from the injection holes 6a of the cleaning nozzle 6. The cleaning nozzle 6 is rotatably supported by a nozzle bearing 5 and a nozzle screw 5a. In the main washing step, the heater 7 provided in the washing tank 2 is energized to heat the washing water 10 and the tableware 12 to a predetermined temperature. After the main washing process for a predetermined time, the process enters a drainage process in which the washing water 10 containing the dirt washed off from the tableware 12 is drained by the drainage pump 8. Next, following this drainage process,
A water supply step of newly supplying cleaning water 10 and foreign substances 11 such as detergents and residual vegetables (food that has adhered as dirt to tableware is referred to as residual vegetables) by injecting the cleaning water 10 from the cleaning nozzle 6.
The rinsing process for rinsing the tableware 12 soiled with the water and the draining process for discharging the washing water out of the machine are repeated four times in succession, and the washing is completed. The foreign substances 11 washed off from the tableware 12 by this washing are collected in the filter 9 provided in the washing tank 2. The filter 9 is provided with a large number of openings 9a so that the washing water 10 can pass therethrough.

However, in such a dishwasher, since a gap is provided in the rotating portion of the washing nozzle, a large amount of washing water 10 leaks from this gap, and the washing efficiency is low and the capacity of the washing pump 4 is required to be excessive. . As a result, the above-mentioned dishwasher has a problem that the amount of washing water required for washing increases or the noise generated by the washing pump increases.

In order to solve this problem, a configuration of a cleaning nozzle shown in FIG. 5 has been proposed. In the figure, reference numeral 13 denotes an injection hole 13a for injecting the cleaning water 10 pressurized by the cleaning pump 4.
Is a nozzle bearing for supporting the cleaning nozzle 13 rotatably. 15 is the washing nozzle 13
A guide tube 16 for feeding the washing water 10 into the container, and a rotary slide shaft 16 extending from the guide tube 15. Reference numeral 17 denotes a rotary seal surface provided on the rotary slide shaft 16, which seals a gap formed between the cleaning nozzle 13 and the nozzle bearing 14 when the cleaning nozzle 13 floats due to the static pressure of the cleaning water 10, thereby preventing the cleaning water from leaking. Things. The outer diameter of the drawing d ₁ is the guide cylinder 15, d ₂ is the nozzle bearing
14 the inner diameter of the outer diameter of d ₃ is rotating the slide shaft 16, d ₄ is the lowest seal width of the rotary seal face 17, P is the static pressure of the cleaning water, W ₁ between the rotary seal face 17 rotating slide shaft 16 This shows the static pressure load.

The operation of the conventional example having the above configuration will be described below. The cleaning nozzle 13 floats from the stationary position shown by the broken line to the position shown in the figure when the cleaning water 10 is filled. At this time,
The rotary slide shaft 16 extending from the guide cylinder 15 comes into contact with the rotary seal surface 17 and slides and rotates. The case contact surface, W ₁ = the static pressure of the washing water ^{_{10 (πd 3 2/4)}} · P load is applied W ₁ of, rotary slide shaft 16 and the rotating seal face 17 is in close contact leaks of the wash water Is lost.

Invention an issue, however the nozzle of a conventional dishwasher is to solve is the diameter d ₃ of the rotary slide shaft 16 is secured to the inner diameter d ₂ of the nozzle bearing 14, the contact area of the rotary slide shaft 16 and the rotating seal face 17 minimum seal width d ₄ to become only necessary sum and the difference of the outline d ₁ of the inner diameter d ₂ and the guide tube 15 of the nozzle bearing 14 (d ₂ -d _1).
That is, the diameter ₃ d of the rotating slide shaft is at least d ₂ + 2 · d ₄ +
Only (d ₂ −d ₁ ) is required. That is, as the rotary slide shaft 16, it is required as corresponds large diameter d _3. Thus also the load W ₁ according to the rotating seal surface 17 becomes large,
Wear during sliding rotation increases. In addition, a rotating slide shaft
16 moves in the radial direction with the rotation of the cleaning nozzle 13, so that the area of the rotary seal surface 17 against which the rotary slide shaft 16 presses the nozzle bearing 14 is constantly fluctuating, and when the left and right are unbalanced Therefore, in order to keep the state of the rotary seal surface 17 constant and to continue rotation without fluctuation, it is necessary that the radial width of the rotary seal surface 17 be constant at any portion. The rotating slide shaft 16 and the rotating seal surface
Since the sliding friction of the nozzle 17 increases and the ejection angle of the ejection hole 13a needs to be provided in the horizontal direction in order to increase the rotational force of the washing nozzle 13, there is also a problem that unnecessary ejection force is generated and the washing performance is deteriorated. .

Incidentally, the load W ₁ by reducing the difference in the outer d ₁ of the inner diameter d ₂ and the guide tube of the nozzle bearing 14 is can be kept low, foreign matter 11 of Zan'na like which has passed through the filter 9 in this case is The cleaning nozzle 13 enters between the nozzle bearing 14 and the guide cylinder 16 and does not rotate.

In view of the above problems, the present invention suppresses the load on the rotary seal surface, which is the surface on which the rotary slide shaft presses the nozzle bearing, minimizes the pressing area as much as possible, and rotates the rotary slide shaft in the radial direction with the rotation of the cleaning nozzle. It is an object of the present invention to provide a dishwasher in which the width of the rotary seal surface in the radial direction is constant and the washing nozzle always rotates stably with a small force, no matter how it moves. In addition to this, it is another object of the present invention to prevent the cleaning nozzle from rotating poorly even if the foreign matter that has passed through the filter enters between the cleaning nozzle and the skew bearing.

Means for Solving the Problems In order to achieve the above object, a first technical means of the present invention includes a cleaning tank, a cleaning nozzle having an injection hole for injecting the cleaning water and rotating in a horizontal direction, and a cleaning water. A filter having a number of openings for collecting residual vegetables mixed in the washing nozzle, a guide tube connected to an opening at the center of the lower surface of the washing nozzle for sending washing water to the washing nozzle, and a lower end of the guide tube A rotating slide shaft extending to protrude outward along the peripheral edge, an annular flat surface forming a radial gap with the cleaning nozzle, and a rotating slide shaft protruding downward along the inner periphery of the flat surface and having an end surface rotating and sliding. A nozzle bearing that has a rotating seal portion pressed by the shaft and sends the cleaning water to the guide cylinder,
The radial gap between the guide cylinder and the rotary seal portion and the axial movable range of the cleaning nozzle are each equal to or larger than the aperture diameter of the filter aperture portion, and the diameter of the nozzle bearing is larger than the diameter of the rotary seal portion. The entire end face of the rotary seal portion is pressed by the rotary slide shaft within the movable range in the axial direction due to the gap between the guide cylinder and the nozzle bearing.

Further, a second technical means of the present invention includes a washing tank, a rotating nozzle having an injection hole for injecting washing water and rotating in a horizontal direction, a rod-shaped nozzle protruding from a central portion of the rotating nozzle,
A guide tube that rotatably supports the rotating nozzle and feeds the washing water to the rotating nozzle, and a nozzle bearing having a diameter larger than the guide tube and connected to the guide tube at the center of the upper end surface thereof, wherein the guide tube is provided with a nozzle bearing. A rotary slide shaft is extended so as to protrude along the peripheral edge of the upper end, and protrudes upward along an inner periphery of an opening provided at the center of the rotary nozzle, and its end face is pressed by the rotary slide shaft. An annular rotary seal portion is provided, the radial gap between the guide cylinder and the rotary seal portion and the axial movable range of the washing nozzle are each set to be equal to or larger than the aperture diameter of the filter aperture, and the diameter of the nozzle bearing Is larger than the diameter of the rotary seal portion, and the entire end face of the rotary seal portion is pressed by the rotary slide shaft within the movable range in the axial direction due to the gap between the guide cylinder and the nozzle bearing. It is obtained as is.

In the above-described dishwasher of the present invention, the area where the static pressure of the washing water is applied is, in the first technical means, the area of the end face of the rotary seal portion protruding downward along the inner periphery of the nozzle bearing, In the second technical means, the area of the end face area of the rotary seal portion protruding upward along the inner periphery of the opening provided at the center of the rotary nozzle is reduced, and the area to which the static pressure of the washing water is applied can be suppressed. it can. For this reason, the floating reaction of the cleaning nozzle exerts an action reaction force on the rotary slide shaft and the rotary seal portion, thereby suppressing the load applied to the end surface of the rotary seal portion serving as a pressing surface, thereby reducing unnecessary jetting force for nozzle driving. Almost all of the washing water can be used for washing dishes, and the washing performance can be improved.

Also, no matter how the rotary slide shaft moves in the radial direction with the rotation of each nozzle, the radial sealing width of the rotary seal surface is constant and the cleaning is always stable with a small force, regardless of the rotation of each nozzle. The rotation of the nozzle can be realized.

In addition, the first technical means further includes a radial gap between the guide cylinder and the rotary seal portion and an axial movable range of the cleaning nozzle, and the second technical means further includes a guide cylinder and the rotary seal portion. Since the radial gap between the filter and the movable range in the axial direction of the washing nozzle is set to be equal to or larger than the opening diameter of the opening of the filter, even if foreign matter that has passed through the filter enters between the washing nozzle and the slip bearing. In addition, the cleaning nozzle does not fail to rotate.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIGS. 1 and 2 show the structure of a dishwasher in a first embodiment of the first technical means of the present invention.
In the figure, 22 is a washing tank having a dish basket 21 and 23 is washing water.
Water supply valve for supplying 32 into the washing tank 22, 24 for the washing pump, 25
Is a nozzle bearing, and 26 is a cleaning nozzle provided with an injection hole 26a for injecting the cleaning water 32 pressurized by the cleaning pump 24. 27 is a guide tube connected to an opening at the center of the lower surface of the washing nozzle 26 to send washing water to the washing nozzle 26;
Reference numeral 28 denotes a rotating slide shaft that extends outward along the periphery of the lower end of the guide cylinder 27. Reference numeral 29 denotes an annular flat surface that forms a radial gap with the washing nozzle 26 and the inner circumference of the flat surface. Is a rotary seal portion that protrudes downward along the edge and whose end face is pressed by the rotary slide shaft 28. When the washing water 32 is supplied into the washing nozzle 26, the washing nozzle 26 floats by the static pressure and is held by the end face of the rotary seal portion 29, thereby preventing the washing water 32 from leaking from this portion. Reference numeral 31 denotes a filter for collecting residual vegetables, which has many openings 31a. In this embodiment, the diameter d of the rotary slide shaft 28 is
₃ is larger than the diameter d ₅ of the rotating seal portion 29, the axial direction of the movable range 25b of the cleaning nozzle 26 and the radial gap 25a and cleaning nozzles 26 of the nozzle bearing 25 the opening of the opening portion 31a of the filter 31 respectively at the same time It is set to be larger than the hole diameter. Filter 31
At the lower part, a drain port 35 communicating with the suction port of the washing pump 24 and the suction port of the drain pump 30 is provided. Reference numeral 33 denotes foreign matter such as dirt dropped from the tableware 34 by washing. 36 is washing water
A heater for heating 32. The figure d ₁ is the outer diameter of the guide tube 27, d ₂ is the inner diameter of the nozzle bearing 25, d ₃ is rotating slide shaft 28
Outer diameter, d ₄ is the lowest seal width of the end face of the rotary seal section 29, d ₅
The outer diameter of the rotating seal face 29, P is the static pressure of the cleaning water 32, W ₂ represents such a static pressure load between the rotary seal unit 29 and the rotary slide shaft 28.

The operation of the above configuration will be described below. The tableware 34 is stored in the tableware basket 21 in the washing tank 22, and a predetermined amount of detergent is added to start the operation. First, the water supply valve 23 is energized,
The cleaning water 32 is supplied into the cleaning tank 22. When a predetermined amount of cleaning water is stored, the cleaning pump 24 operates to pressurize the cleaning water 32 and supply the cleaning water 32 containing the detergent to the cleaning nozzle 26.
The cleaning water 32 containing the supplied detergent is injected from the injection holes 26a toward the tableware 34 of the tableware basket 21. In this main washing step, dirt attached to tableware and the like is washed away. The cleaning water 32 containing the dirt that has passed through the main cleaning step is sent to the cleaning pump 24 while being filtered by the filter 31. Thus, the cleaning water 32 is pressurized again by the cleaning pump 24, and is again injected from the injection hole 26a of the cleaning nozzle 26. By repeating this main washing step, washing of the tableware 34 is completed. At this time, the washing nozzle 26 floats by static pressure when the washing water 32 is filled therein, and the rotating slide shaft extended to the guide cylinder 27 is provided.
28 comes into contact with the end face of the rotary seal portion 29 to slide and rotate. This is when the contact surfaces, since the load W ₂ according by the static pressure of the washing water 32, the water leakage of the washing water is eliminated end face of the rotary slide shaft 28 rotating seal portion 29 is in close contact. The load W ₂ is W ₂ = can be expressed by ^{_{(πd 5 2/4) ·}} P. That is, in the configuration of this embodiment, the area static pressure P is applied is made by a portion of the outer diameter d ₅ of the rotating seal portion 29. The outer diameter d ₅ of the rotary seal unit 29, need only the sum of the minimum seal width d ₄ to ensure the contact area of the end face of the inner diameter d ₂ and the rotary slide shaft 28 of the nozzle bearing 14 rotating seal portion 29 Becomes That is, the outer diameter d ₅ of the rotating seal portion 29 is expressed by the following equation.

d ₅ = d ₂ + 2 · d ₄ Table 1 shows the calculation result of the load W in comparison with the conventional example.

As described above, the load W ₂ of the end face of the rotary slide shaft 28 rotating seal portion 29 according to this embodiment can be reduced by approximately 20% compared with the prior art, the wear amount of the sliding surface of revolution decreases. Further, the sliding friction between the rotating slide shaft 28 and the end face of the rotating seal portion 29 is reduced, and the rotating force required by the cleaning nozzle 26 can be reduced. Therefore, it is not necessary to increase the rotational force of the washing nozzle by utilizing the reaction of the washing power of the washing water by giving an angle to the ejection hole as in the related art, and the ejection angle of the ejection hole 26a can be made closer to the vertical direction. . That is, unnecessary jetting power is suppressed, and cleaning performance is improved.

In addition, foreign matter 33 that has passed through the opening 31a of the filter,
Injection hole 26a provided in normal cleaning nozzle 26 mixed in cleaning water 32
From the rotary seal part 29
Is bitten by the end face of. In the case where foreign matter is caught in the end face of the rotary seal portion 29 as described above, the foreign matter can be easily removed in the present embodiment. That is, since the movable range 25b in the axial direction of the cleaning nozzle 26 is set to be equal to or larger than the hole diameter of the opening of the filter, a gap can be created between the rotary slide shaft 28 and the rotary seal 29. . By utilizing this gap, the foreign matter 33 can be discharged to the outside together with the cleaning water 32. In the case where the foreign matter 33 has caught in the radial gap 25a between the cleaning nozzle 26 and the rotary seal portion 29 shown in FIG. 2, this gap 25a is formed in the filter opening portion 31a in the present embodiment as described above. Since the diameter is set to be equal to or larger than the hole diameter, any foreign matter having a diameter equal to or smaller than the diameter of the opening portion 31a of the filter can pass through the gap. As described above, according to the present embodiment, rotation failure due to foreign matter does not occur. Also, the diameter d ₃ of the rotating slide shaft 28 is
Large urban than the diameter d ₅ of the rotating seal portion 29, and by increasing its size than the gap 25a of the shaft diameter of the cleaning nozzle 26 and the nozzle bearing 25, shift the axis of the guide cylinder 27 and the nozzle bearing 25 Even during rotation, the end face of the rotary seal portion 29 always contacts the rotary slide shaft 28. Therefore, the contact area between the two is always constant, and the reliability is high.

In the main washing step, the heater 27 provided in the washing tank 22 is energized to heat the washing water 32 and the dishes 34 to a predetermined temperature.
After the main washing step for a predetermined time, a draining step of draining the dirty washing water 32 is performed, and the washing water 32 in the washing tank 22 is sent to the drain pump 30 while being filtered by the filter 31,
Emitted outside the machine. Subsequently, a water supply step of newly supplying cleaning water, a rinsing step of rinsing tableware 32 contaminated with detergent or residual vegetables by injecting cleaning water 32 from the cleaning nozzle 26, and cleaning water 32 outside the machine. The draining step of discharging is repeated four times in succession, and the rinsing is completed.

Next, a second embodiment which is a second technical means of the present invention will be described with reference to FIG. In this embodiment, the configuration is the same as that shown in FIG. 1, except for the configuration of the cleaning nozzle shown in FIG. Reference numeral 40 denotes a cleaning nozzle provided with an injection hole 40a for injecting the cleaning water pressurized by the cleaning pump, and includes a rotary nozzle 41 and a rod-shaped nozzle 42 protruding from the center of the rotary nozzle 40. 43 is a nozzle bearing, 44 is a rotary slide shaft, 45 is a rotary seal part, and 46 is a guide cylinder.
The guide cylinder 46 rotatably supports the rotary nozzle 41 and sends the cleaning water to the rotary nozzle 41, and the nozzle bearing 43
Has a larger diameter than the guide tube 46 and is connected to the guide tube 46 at the center of the upper end surface. The rotating slide shaft 44 is a guide cylinder
It extends so as to protrude along the periphery of the upper end of 46,
The rotary seal portion 45 protrudes upward along the inner circumference of an opening provided at the center of the rotary nozzle 41 and has an end face pressed by the rotary slide shaft 44 to seal the washing water. In this embodiment, the diameter d ₃ of the rotary Surado shaft 44 larger than the diameter d ₅ of the rotating seal portion 45, a gap 46a of the shaft diameter of the cleaning nozzle 40 and the nozzle bearing 43, the washing nozzle 40 in the axial direction The movable range 43a is larger than the hole diameter of the opening 31a of the filter 31. The outer diameter of the drawing d ₁ is the nozzle bearing 43, the lowest seal width of the end face of the d ₄ is the rotary seal unit 45, d ₅ is the outer diameter of the rotary seal face 45, P is the washing water 32 static pressure, W ₂ is 4 shows a static pressure load applied between the end face of the rotary seal portion 45 and the rotary slide shaft 44.

Hereinafter, the operation of this embodiment will be described. As in the first embodiment, the cleaning nozzle 40 floats when the cleaning water 32 is filled, and the rotary slide shaft 44 extended from the guide cylinder 46 comes into contact with the end face of the rotary seal portion 45 and slides and rotates. . At this time washing water
32 takes the load W ₂ is the contact surface by the static pressure of the water leakage of the washing water does not occur. Area this time static pressure P is applied are that the smaller the outer diameter d ₅ of the rotating seal portion 45 than the outer diameter d ₃ of the rotary slide shaft 44, filled washing water 32 to the outer end face of the rotary seal section 45 Therefore, only the projected area of the rotary seal 45 is obtained.

In the first and second embodiments, the case where the cleaning water is supplied upward is shown. However, the same effect can be obtained by changing the direction of the cleaning nozzle and providing the cleaning water in the horizontal or reverse direction. Things.

As described above, according to the configuration of the present invention, the area to which the static pressure of the cleaning water is applied is, in the first technical means, the end face of the rotary seal portion projecting downward along the inner periphery of the nozzle bearing. In the second technical means, the area is equal to the area of the end face of the rotary seal portion protruding upward along the inner periphery of the opening provided at the center of the rotary nozzle, and the static pressure of the washing water is applied. The area can be reduced. For this reason, the load applied to the rotating slide shaft and the end face of the rotating seal portion, which is a pressing surface between the rotating seal portion, is suppressed, so that unnecessary jetting force for driving the nozzle is not required, and almost all of the washing water is removed from the tableware. It can be used for cleaning and the cleaning performance can be improved.

Also, no matter how the rotary slide shaft moves in the radial direction with the rotation of each nozzle, the radial sealing width of the rotary seal surface is constant and the cleaning is always stable with a small force, regardless of the rotation of each nozzle. The rotation of the nozzle can be realized.

In addition, the first technical means further includes a radial gap between the guide cylinder and the rotary seal portion and an axial movable range of the cleaning nozzle, and the second technical means further includes a guide cylinder and the rotary seal portion. Since the radial gap between the filter and the movable range in the axial direction of the washing nozzle is set to be equal to or larger than the opening diameter of the opening of the filter, even if foreign matter that has passed through the filter enters between the washing nozzle and the slip bearing. In addition, the cleaning nozzle does not fail to rotate.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a dishwasher according to a first embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the washing nozzle, and FIG. 3 is a second embodiment of the present invention. FIG. 4 is a longitudinal sectional view of a conventional dishwasher, and FIG. 5 is a longitudinal sectional view of a conventional washing nozzle. 21 ... Tableware basket, 22 ... Washing tank, 25/43 ... Nozzle bearing, 26
・ 40 ... washing nozzle, 26a ・ 40a ・ ・ ・ injection hole, 27 ・ 46 ・ ・ ・ guide cylinder, 28 ・ 44 ・ ・ ・ rotary slide shaft, 29 ・ 45 ・ ・ ・ rotary seal,
31 ... Filter, 31a ... Opening.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takashi Miyauchi 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-62-299232 (JP, A) JP-A-62- 231615 (JP, A) JP-A-55-20986 (JP, A) JP-B-51-43708 (JP, B2)

Claims (2)

(57) [Claims] A filter having a washing tank, a horizontally rotating washing nozzle having an injection hole for injecting washing water, and a large number of openings for collecting residual vegetables mixed in the washing water; A guide tube connected to an opening at the center of the lower surface of the washing nozzle to send the washing water to the washing nozzle, and a rotating slide shaft extending so as to protrude outward along a lower end peripheral edge of the guide tube; A nozzle bearing that has an annular flat surface that forms a gap in the radial direction with the washing nozzle, a rotating seal portion that protrudes downward along the inner circumference of the flat surface and whose end surface is pressed by a rotating slide shaft, and that sends washing water to the guide cylinder. Wherein the radial gap between the guide cylinder and the rotary seal portion and the axial movable range of the cleaning nozzle are each equal to or larger than the aperture diameter of the aperture portion of the filter, and the diameter of the nozzle bearing is the rotary seal. Part diameter Dishwasher so as to be pressed across the end face of the rotating seal portion by rotating the slide axis in the movable range of the axial type directional by the gap between the guide tube and the nozzle bearing so as to be larger. 2. A washing tank, a rotating nozzle having an injection hole for injecting washing water and rotating in a horizontal direction, a rod-shaped nozzle protruding from a central portion of the rotating nozzle, and a rotatably supporting and rotating rotatable nozzle. A guide tube for feeding the washing water to the nozzle, and a nozzle bearing having a diameter larger than the guide tube and connected to the guide tube at the center of the upper end face thereof, the guide tube protruding along the periphery of the upper end thereof. The rotating slide shaft is extended so as to protrude upward along the inner periphery of the opening provided in the center of the rotating nozzle, and has an annular rotating seal portion whose end face is pressed by the rotating slide shaft,
The radial gap between the guide cylinder and the rotary seal portion and the axial movable range of the cleaning nozzle are each equal to or larger than the aperture diameter of the filter aperture portion, and the diameter of the nozzle bearing is larger than the diameter of the rotary seal portion. A dishwasher in which the entire end face of the rotary seal portion is pressed by a rotary slide shaft within a movable range in the axial direction due to a gap between the guide cylinder and the nozzle bearing.