JP3115870B1 - Dishwasher - Google Patents

Abstract

An object of the present invention is to reduce rinsing water in a dishwasher using a square rack. SOLUTION: A rectangular rack 20 on which tableware is placed so as to be able to be taken in and out of a tank, and a first rinsing nozzle which rotates around a substantially center of the rack 20 and ejects rinsing water over the entire circumference. Arm and the rack 20
And a second rinsing nozzle arm for spouting rinsing water at the corner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher in which dishes are placed on a square rack for washing.

[0002]

2. Description of the Related Art FIG. 1 shows an example of a conventional commercial dishwasher.
It will be described based on. First, 1 is a washing tank, 2 is a cover of a washing machine, 3 is washing water in which a detergent is dissolved, 4 is a washing pump, 5 is a nozzle arm for rotating washing, 6 is a blowing nozzle of washing water 3, and 7 is an overflow pipe. Reference numeral 8 denotes a drain port, which guides the cleaning water 3 stored in the cleaning tank 1 to the cleaning pump 4 to pressurize the cleaning water 3 and blows out the cleaning water 3 from the blowing nozzle 6 of the cleaning nozzle arm 5 to reduce the output of the cleaning water. A circulating washing circuit is constructed in which washing water is sprayed on the tableware for about 50 seconds while being rotated by itself to wash the tableware placed on a rack, which will be described later.

[0003] After the cleaning, the rinsing tank 10
The rinsing water 14 stored in the rinsing pump 14 is pressurized by the rinsing pump 11, and the rinsing nozzle arm 1 is
2, sprayed from a plurality of rinsing nozzle tips 13 attached to the nozzle arm 12, sprayed onto tableware, and rinsing for about 12 seconds while rotating the rinsing nozzle arm 12 using the blasting power. It is.

[0004] For holding dishes to be washed,
Generally, a 50 cm square rack is often used as a global standard product. In FIG. 1, a square rack 20 of 50 cm is arranged on the above-described cleaning nozzle arm 5 and the rinsing nozzle arm 12 so as to keep a constant interval.

[0005] Various racks for various purposes, such as a utility rack, a dish rack, and a glass rack, are circulated in such a rack 20. FIG. 20 is shown. Rack 20 for glasses
Has a square shape with an outer dimension of 50 cm × 50 cm, and the inside is partitioned by a partition plate 21 so that the glasses do not collide with each other. FIG. 2 shows a perspective view of the rack 20 for 25 pieces. The bottom surfaces of all the racks 20 are large mesh-shaped bottom surfaces so as not to hinder the spraying of the washing water 3 and the rinsing water 14.

[0006] In the cleaning process of the general commercial cleaning machine described with reference to FIG. 1, first, the hood-shaped cover 2 is opened, and the rack 20 on which the dishes to be cleaned are placed is slid onto the rack rails 23, and the cover 2 When the valve is closed, the cleaning pump 4 is operated and the cleaning is performed for about 50 seconds. The cleaning water 3 is stored in the cleaning tank 1 in advance, and is usually 30 liters [hereinafter, (l)]. The washing water 3 of about 50 to 50 (l) is repeatedly pressurized by the washing pump 4 and spouted toward the tableware from the blowing nozzle 6, and the spouted washing water 3 returns to the washing tank 1 and is again washed with the washing pump 4. And is blown out from the blowing nozzle 6. The cleaning pump 4 has a power of 0.4 kW to 0.75 kW and a flow rate of about 200 (l) to 400 (l) per minute. The temperature of the washing water 3 is kept at 65 ° C., and the detergent concentration is
Automatically adjusted to maintain 0.2%.

When the washing process for about 50 seconds is completed, about 4 to
The rinsing step is performed after a drain time of 5 seconds. The rinsing step is set to about 12 seconds, and the rinsing water 14 stored in the rinsing tank 10 is pressurized by the rinsing pump 11 and the rinsing nozzle arm 1 that rotates by itself.
The spray nozzle 2 is sprayed from the rinsing nozzle tip 13 disposed on the table 2 toward the tableware.

The rinse water 14 to be sprayed is sprayed at a rate of about 5 (l) each time during a 12-second rinsing step. Since the rinse water 14 is clean hot water heated to 85 ° C. Disinfection by spraying on tableware
The dishwasher is heated after the dishwashing effect is obtained and the dishwasher is washed off with the washing water 3 and the dishwasher is warmed. The film surface of the rinse water on the surface of the tableware dries quickly, and the tableware can be sanitarily washed without the need to wipe it with a cloth or the like.

Accordingly, the running cost of a general commercial dishwasher is calculated. The conditions are as follows. (A) 50 racks are processed per hour. (B) 5 (l) of rinse water is consumed each time. (C) Rinsing water is heated from 15 ° C tap water to 85 ° C with an electric heater (860 kcal / kW · H). here,
The unit price of power kW · H is assumed to be 20 yen. (D) Water supply costs are unit prices in Tokyo (including sewerage charges).
0 yen / m ³ . (E) The cleaning pump is 0.95 kW at 0.75 kW output.
Power consumption. (F) The rinse pump consumes 0.4 kW of power. (G) Assuming that the detergent is mixed with the washing water 3 at a concentration of 0.2%, the amount is 500 yen / kg. . (B) The cost of the rinse water is calculated by (c) and (d).

5 (l) × 50 times = 250 (l) /H=0.25 m ³ 250 (l) × (85 ° C.-15 ° C.) = 17500 kcal required heat quantity 17500 kcal ÷ 860 kcal / kW · H = 20. 4 kW · H (where 860 kcal is the amount of heat generated by the 1 kW · H electric heater) 20.4 kW · H × 20 yen = 408 yen ... A 250 (l) water bill is 0.25 m ³ × 160 yen = 40 Yen: B A + B = 448 yen (cost of rinsing water per hour) C: Electricity of washing pump and rinsing pump The washing pump is operated for 50 seconds at a time, and the rinsing pump is operated for 12 seconds at a time, and is not operated simultaneously. Therefore, 0.9 kW × (50 seconds × 50 times) +0.4 kW × (12 Seconds × 50 times) = 0.9 kW × 0.7 H + 0.4 kW × 0.17 H = 0.63 kW + 0.07 kW = 0.7 kW × 20 yen = 14.0 yen ... D. Detergent cost Since 250 (l) of rinse water is released per hour and the wash water 3 is diluted, it is replenished to a concentration of 0.2%. 250 (l) x 0.2% = 50 g x 500 yen / Kg = 25 yen Actually, 30 (l) of the washing water 3 must be made 0.2% in concentration first, so that 6 g × 500 yen / k
Even if half of 1.5 yen of g = 3.0 yen is added, 26.5 yen ... E. Therefore, the running cost is C + D + E = 48.
8.5 yen, which is 448 yen (91.7%) + 14.0 yen (2.9%) + 26.5 yen (5.4%).

[0011]

Considering the running cost in the series of washing steps described above as washing and rinsing, in the washing step, after the washing tank 1 is first filled with hot water, the subsequent steps are repeated. Since the washing cycle is always circulating, it is mainly about the electricity cost of the washing pump.

However, in the rinsing step, about 5 (l) of hot water is sprayed and rinsed each time, so that the cost of consuming the hot water becomes very large. Rinse water sprayed in each rinsing process 1
The washing water 3 is added to the washing water 3 to help prevent the temperature of the washing water 3 from dropping.
Although a temperature maintaining device such as an electric heater is preferably used, most of the shortage of heat is obtained by replenishing the rinse water 14 each time, and the ratio of the cleaning water 3 to the running cost is the rinse water 14. The fact that the detergent concentration is gradually reduced by replenishing the detergent every time means that the detergent cost for replenishing and adding the detergent by the detergent concentration controller occupies most.

[0013] The consumption of this detergent is
Considering that 5 (l) is added to the washing water 3 each time, after the first washing water 3 is charged with a detergent for adjusting the detergent concentration to 0.2%, thereafter, each washing water 3 is added once. 5 for cleaning
The detergent concentration of the newly added washing water 3 of (l) is 0.2
% Detergent may be needed to keep
This is proved in actual driving.

This means that the consumption of the detergent is proportional to the consumption of the rinse water 14. Considering that most of the running cost is the cost of the hot water for the rinse water 14, It can be said that the running cost is almost (90%) determined by the consumption of the rinse water 14.

The present invention is to reduce the rinsing effect on the rinse water consumption per dishwasher in which the washing and rinsing is automatically performed by the rotary nozzle type washer using the rack 20 described above. The present invention relates to a configuration that can be reduced by 35% or more, but for comparison with the present invention, first, a conventional general rotary rinse nozzle spray structure will be described.

The rotary rinse nozzle spray structure of a dishwasher which has been widely used until now is the part shown in the rinse nozzle arm 12 and the rinse nozzle tip 13 of FIG. 1, and the detailed structure of this part is shown in FIG. Show. The spray pattern obtained by this structure will be described with reference to FIG. In FIG. 3, reference numeral 31 denotes a rinse water conduit, and two to four opening holes 34, into which a pivot 35 is press-fitted, are formed at the end thereof. 32 is a bearing bush, 33 is a center housing, 12 is a rinse nozzle arm, 13a, 13b, 13
c, 13d are rinse nozzle tips, 36, 37, 38,
39 is a spray pattern when sprayed from a rinse nozzle tip, 20 is a square rack for general-purpose glass having an outer side of 50 cm, 21 is an internal partition plate of the rack 20, 2
4 is a glass to be washed, and 26 is a glass placed in the corner of the rack 20 among the glasses 24.

Now, the rinsing water 14 pressurized by the rinsing pump 11 passes through the rinsing water conduit 31 to open the opening 3.
4 through the rinse nozzle arm 12 and the rinse nozzle tip 13a implanted in the rinse nozzle arm 12.
~ 13d sprayed.

5 cm to 8 above the rinsing nozzle arm 12
cm, the rack 20 has glasses 24, 2
6 is set.

FIG. 4 illustrates the relationship between the rack 20 and the rinse nozzle arm 12.

Since one or two of the rinsing nozzle tips 13a and 13b are slightly tilted from right above to give a thrust, the rinsing nozzle arm 12 rotates while spraying by itself. The spray pattern sprayed from the rinse nozzle tips 13a to 13d has oblong shapes 36, 37, 38, and 39 (FIG. 3).
(See Reference), and the tableware placed on the rack 20 is sprayed while rotating.

In particular, the rinsing nozzle tips 13a, 13d set at the end of the rinsing nozzle arm 12 are adapted to spray against a glass 26 placed at the corner of the rack 20, and have a circular area 25 shown in FIG. It rotates while spraying the outer peripheral part of.

As shown in FIG. 4, the diagonal distance of AA of the rack 20 is 50 cm, but the diagonal distance of BB is approximately 70 cm, so that 25 circular areas 35 ² π = 384.
The entire area of 6 cm ² must be sprayed.

Therefore, the area 13 of the area obtained by subtracting the area 2500 cm ² of the 50 cm square rack 20 from the area of the circle 25 is 25.
46 cm ² (four half-moon-shaped glasses 26... Indicated by dotted hatching in FIG. 4) is an area in which the rinse water 14 was sprayed uselessly without hitting the dishes, and the area ratio was 35%. Reach.

The present invention is intended to provide an automatic rinsing system capable of saving 35% of the rinsing water 14 without spraying into a useless spray area by paying attention to this point.

[0025]

According to the first aspect of the present invention,
A rectangular rack on which tableware is placed and which can be freely taken in and out of the tank, and a circular spur which rotates about the center of the rack as a center of rotation and has a maximum diameter on the opposite side of the rack.
Rinse hot water with a spray pattern that covers the
A first rinsing nozzle arm provided with a rinsing nozzle tip for ejection;
Spray putter covering only the diagonal corners of the rack
A second rinsing nozzle arm provided with a rinsing nozzle tip for jetting the rinsing water .

[0026]

[0027] According to a second aspect of the invention, the dishwashing machine according to claim 1 Symbol placement, a first rinsing nozzle arm and the second rinsing nozzle arm, arranged two by two, respectively around the rinsing water conduit Have been.

The invention according to claim 3, in dishwashing machine according to claim 1 Symbol placement, one first rinse nozzle arm around a rinsing water conduit and one second rinse nozzle arm arrangement Has been established.

The invention according to claim 4, in dishwashing machine according to claim 1 Symbol placement, the supply of hot water rinse for the second rinse nozzle arm, four holes are intermittently opened in the circumferential direction The rotation was performed using the provided rotary valve seat.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. First, a description will be given with reference to FIGS. In FIG. 6 and FIG. 7, reference numeral 51 denotes a rinse water conduit, the end of which is press-fitted with a pivot 53.
It is cut out from a square rod so that four water passage-like passages 56 are formed.

Further, four horizontal holes 55 (see FIG. 7) are formed at right angles near the end of the rinse water conduit 51. Numeral 57 denotes a rotary valve seat, in which the long rinse nozzle arms 60 and 61 are inserted through the center housing 52 inside the center housing 52, and a water path in the direction of the arrow is formed again at a position rotated 90 ° from the position of FIG. When it is in another angular position, the water channel is closed so as to act as a rotary automatic valve.

Further, a supplementary explanation will be given.
The center housing 52 and the rotary valve seat 57 hold the rinse nozzle arms 60 and 61 as if they were integral, are stopped by screws 59, and rotate while being sealed by an O-ring 58. And C- of FIG.
Only when in the position of the C sectional view and further when in the position rotated by 90 °, four passages of the rinse water 14 pushed up from the rinse water conduit 51 are opened at the upper part of the rinse water conduit 51. It flows out through the hole 55 and is sprayed from the rinsing nozzle tips 65, 67 set at the ends of the rinsing nozzle arms 60, 61. When the spray state is illustrated by being superimposed on the rack 20,
As shown in FIG. 7, when the directions of the four holes 55 of the rinse water conduit are set toward the four corners of the rack, when the holes 54 formed in the rotary valve seat 57 overlap with the holes 55, That is, only when the rinsing nozzle arms 60 and 61 come to the four corners of the rack 20, the holes 55 of the rotary valve seat 57 are opened and sprayed, so that the long arms 60 and 61 shown in FIG. The nozzles 65 and 67 form spray patterns 70 and 76 to perform the function of spraying only the four corners of the rack.

In FIG. 5, the rinsing nozzle arms 60, 61
Are long and the rinsing nozzle arms 62 and 63 are short, and these are attached to the center housing 52 to form a four-arm type.

Next, the structure constituted by the short rinsing nozzle arms 62 and 63 and the function thereof will be described with reference to FIG. FIG. 6 shows a DD section of FIG. Therefore, the center housing 52, the pivot 53,
The rotary valve seat 57 is common to FIG. What has changed is that the short nozzle arm is
The rinsing water 14 that is connected to the rinsing water pipe 51 and is pushed up from the hole 56 of the pivot 53 through the rinsing water conduit 51 passes through the two rinsing nozzle arms 62 and 63 and the rinsing nozzle tip 6.
It is sprayed from 8,69. This is because the long squirt nozzle arms 60, 6 shown in FIG.
One configuration is different from the rotary valve seat 57 that sprays only when the rinse nozzle tips 65 and 67 come to the four corners. A hole 55 into which the arms 60 and 61 fit,
The rinse water 14 is always flushed with the rinse nozzle tip 68, regardless of the position of the four holes 54 in the upper part of the rinse water conduit 51.
Rinsing from 69 means that a rinse spray pattern of 80, 81 has been formed.

The entire four-arm mechanism shown in FIG. 5 can be rotated in a certain direction at an appropriate speed by twisting and mounting the rinse nozzle tips 68 and 69 slightly above.

Therefore, the rinse nozzle tips 68, 6 attached to the short rinse nozzle arms 62, 63 of FIG.
The pattern of spraying while rotating 9 is shown in FIG.
As shown in FIG. 8, a donut-shaped pattern 82 having an outer diameter of about 50 cm and having a central portion removed by rotating a rinse spray pattern 80 (having an oblong shape in FIG. 8) sprayed from the rinse nozzle tip 69 is formed. Formed and the rinsing nozzle tip 68 of the rinsing nozzle arm 63
In the same manner, a disc-shaped pattern 83 having a diameter of about 30 cm and covering substantially the center is obtained as the rinse spray pattern 81 released from the nozzle.

The patterns 83 and 82 are sprayed while the rinsing water 14 is always supplied under pressure by the rinsing pump 11.

In contrast, the rinsing nozzle tips 65, 67 attached to the long rinsing nozzle arms 60, 61 described in FIG. 7 will spray only when they come to the corners of the rack 20. FIG. 10 shows a spray pattern obtained by rotating the nozzle that combines the two. FIG. 10 can be said to be a spray pattern diagram of the rinse water 14 synthesized according to FIGS. 8 and 9.

The short rinse nozzle arms 62, 63 of FIG.
The rinse nozzle tips 68 and 69 attached to the
An oblong spray pattern 81 is made. Since the rinsing nozzle arms 62 and 63 have a function of spraying while rotating at all times, the range of the rinsing spray pattern 82 and 83 in FIG. Become. These two rinse nozzle tips 68 and 69 cover a circular pattern of about 50 cm inscribed in the square rack 20, leaving four insufficient corners where the rinse water 14 does not hit at four corners.

However, as shown in FIG. 7, the rinse nozzle tips 6 of the long rinse nozzle arms 60, 61
The rinse spray patterns 70,76 according to 5,67
When it comes to the corner of the rack 20, the holes 54 of the rotary valve seat 57 and the four holes 55 of the rinsing pipe 51 coincide with each other, so that a passage to the rinsing nozzle tips 65, 67 of the rinsing nozzle arms 60, 61 is formed. As a result, only the areas where the four corners were insufficient were sprayed.
As shown in FIG. 0, it can be said that the internal area of the rectangular rack 20 could be rinsed and sprayed without waste.

Therefore, according to the present embodiment, in the conventional widely used rinsing nozzle structure, in order to rinse the dishes placed at the four corners of the square rack 20 as shown in FIG. 70cm of diagonal diameter (3846
cm ²⁾ it must be sprayed with a circle area of, 1346cm ² of the area fraction of the 4 pieces of the rack of the area (2500cm ²⁾ half-moon of 26 minus is said to have been wasted spray, this minute Can be almost eliminated according to the present embodiment, and as a result, a rinse spray structure that can save at least 35% of the rinse water 14 is obtained.

In the present embodiment, the rack 20
Although a lower spray structure has been described that sprays from bottom to top, the same structure may be applied to the rinse nozzle structure (12, 13 in FIG. 1) at the top of the rack 20.

However, the effect of the present embodiment has a great effect when applied to the lower spray nozzle of FIG.
This is because the bottom of the rack 20 is generally
cm-8 cm above, so rinse nozzle tip 65,
The rinse spray patterns 70, 76, 80, 81 sprayed from 67, 68, 69 reach the dishes before spreading too much, and the patterns described in FIGS. 6, 7 and 8 are almost exactly the bottom of the rack 20. Is clearly realized.

On the other hand, the rinsing nozzles 12, 1 in the upper part of FIG.
3 is 45 to 50 cm away from the bottom surface of the rack 20, so that the rinsing pattern is less feasible than when applied to the lower spray nozzle.

Therefore, it is conceivable that the present embodiment is applied only to the lower spray and the upper nozzle has the same structure as before or a fixed nozzle system in which four nozzles are fixed and sprayed without rotating. .

Next, as shown in FIG.
The rinsing nozzle arm 60, 61, 63, 64 has been described in a cross shape, but the nozzle arm 12 shown in FIG.
0 and 62 can be realized in a form that is almost the same in appearance as the conventional one.

Also, in the configuration shown in FIG. 11, FIGS.
It can be seen that the function described with reference to FIG. 7 is realized with a further simplified structure. In other words, in FIGS. 5 and 7, one rinse nozzle tip 65 and one rinse nozzle arm 60 are used instead of the long rinse nozzle arms 60 and 61. The center rotary valve mechanism is almost the same, and there are still four holes 55 in the upper part of the rinse water conduit 51, and two rotary nozzle arms 60, 61 have penetrated the rotary valve seat 57 so far. The two nozzle nozzles 60 and 61 are attached in the same shape to form a flow path at the same time. However, since this is for one rinse nozzle arm 60, a hole into which the rinse nozzle arm 60 fits is formed. Need only be processed once. By doing so, in FIG. 5, two long rinse nozzle arms 60,
When 61 came to the corner of the rack 20, the spray was sprayed from the two rinse nozzle tips 65 and 67 at the same time. However, in the structure of FIG. 11, the spray is performed from only one of them.
Therefore, the number of times of spraying has been two times in one rotation so far, but is changed to one time in the structure of FIG. Therefore, the nozzle outlet of the rinsing nozzle tip 65 may be enlarged by that amount to double the spray amount.

Next, in FIG. 6, two rinse nozzle tips 68, 69 are attached to the two short nozzle arms 62, 63, but in FIG. Rinse nozzle tips 6
It can be seen that the same function as in FIG. 6 is achieved by attaching 8, 69 at the same distance from the center as in FIG.

As described above, even the structure shown in FIG.
As a result, the same spray effect as described above can be obtained, and the actual product may have the structure shown in FIG.

The present embodiment reduces the rinsing water which accounts for most of the running cost by 31% by applying to the rinsing nozzle arm 12 of a widely used dishwasher as shown in FIG. However, the present embodiment is applied only to the rinsing step and not to the washing step of the dishwasher.

In the above description, all cases have been described in which 25 glasses are placed on a glass rack for washing. However, the same applies to washing other dishes such as dishes and bowls. The description of the cleaning of the above was omitted.

[0052]

The invention of claim 1, wherein according to the present invention includes a rectangular rack mounted for out in the dishes are placed tank, said La and rotated about a substantially center of the rack
Cover the circular spray area with the maximum diameter on the opposite side of the
Rinse with a spray pattern of rinsing hot water
A first rinsing nozzle arm having a nozzle tip, and rotating about a center of the rack as a center of rotation to rotate the rack;
Rinsing water with spray pattern covering only diagonal corners
And a second rinse nozzle arm provided with a rinse nozzle tip for jetting the nozzle nozzle, so that the first rinse nozzle arm and the second rinse nozzle arm are rotating and the rack has a square shape. However, the rinsing water can be spouted according to the shape of the square rack, and the running cost can be extremely reduced.
Resource saving of detergent and water can be achieved. For example, based on the above calculation, the cost of the rinsing water 14 is 91.7%.
And the majority of running costs, and
A 35% reduction in rinsing water 14 results in a 35% reduction in detergent cost E, which is a decrease of 448 yen + 26.5 yen = 474.5 yen, a 35% reduction. In other words, a saving of 166 yen / hour is also achieved from this point. Therefore, if the operation is performed for 4 hours a day and the operation for one year is 300 days, the cost saving is 166 yen × 4 hours × 300 days = 199,200 yen. This has the effect of saving energy, water and chemical detergents, and has a significant energy saving effect in practical use.

[0053]

[0054] According to a second aspect of the invention, the dishwashing machine according to claim 1 Symbol placement, a first rinsing nozzle arm and the second rinsing nozzle arm, arranged two by two, respectively around the rinsing water conduit As a result, a high-density rinse water can be supplied, and efficient processing can be performed.

[0055] According to a third aspect of the invention, the dishwashing machine according to claim 1 Symbol placement, one first rinse nozzle arm around a rinsing water conduit and one second rinse nozzle arm arrangement Since it is provided, the structure of the dishwasher can be simplified.

[0056] The invention of claim 4, wherein, in the dishwashing machine according to claim 1 Symbol placement, the supply of hot water rinse for the second rinse nozzle arm, four holes are intermittently opened in the circumferential direction Because it was done using the rotary valve seat provided,
By simply rotating the second rinsing nozzle arm, intermittent jetting of rinsing water to the corners of the rack can be easily performed.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view of a conventional commercial dishwasher.

FIG. 2 is a perspective view showing an example of a rack.

FIG. 3 is a vertical side view showing a relationship between a rack and a rinse nozzle arm.

FIG. 4 is a plan view of the spray pattern in FIG. 3;

FIG. 5, showing an embodiment of the present invention, is a plan view of a rinsing nozzle arm.

FIG. 6 is a vertical sectional side view of a first rinse nozzle arm.

FIG. 7 is a vertical side view of a second rinse nozzle arm.

FIG. 8 is a plan view showing a spray pattern by a first rinse nozzle arm and a spray range by the spray pattern.

FIG. 9 is a plan view showing a spray pattern by a second rinse nozzle arm and a spray range by the spray pattern.

FIG. 10 is a plan view showing a spray pattern by a first rinsing nozzle arm and a second rinsing nozzle arm and a spray range by the spray pattern.

FIG. 11 is a longitudinal sectional side view showing a modification of the embodiment of the present invention.

[Explanation of symbols]

 20 racks

Continuation of front page (56) References JP-A-11-19019 (JP, A) JP-A-63-216526 (JP, A) JP-A-4-164429 (JP, A) JP-A-7-148102 (JP, A) , A) JP-A-51-31070 (JP, A) JP-A-58-11449 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A47L 15/22 A47L 15/46

Claims (4)

(57) [Claims] 1. A rectangular rack on which tableware is placed so as to be able to be taken in and out of a tank, wherein the rack is rotated about a center of the rack as a center of rotation, and the opposite side dimension of the rack is defined as a maximum diameter.
Spray pattern covering a circular spray range
A first rinsing nozzle arm having a rinsing nozzle tip for ejecting rinsing water, and rotating only about a center of the rack as a rotation center to cover only a diagonal corner of the rack.
Rinse nozzle tip for spraying rinse water with a spray pattern
Dishwasher, characterized in further comprising that the second rinsing nozzle arm having a-up. 2. A first rinsing nozzle arm and the second rinsing nozzle arm, according to claim 1 Symbol <br/> mounting, characterized in that it is arranged two by two, respectively around the rinsing water conduit Dishwasher. 3. Rinse one first rinsing nozzle arm of the and one second rinse nozzle arm around a hot water conduit, characterized in that it is provided according to claim 1 Symbol placement dishwashing Machine. 4. The method according to claim 1, wherein the supply of the rinsing water to the second rinsing nozzle arm is performed using a rotary valve seat having four holes intermittently opened in a circumferential direction. dishwasher according to claim 1 Symbol placement.