JPH05305050A - Dish washer - Google Patents

Abstract

PURPOSE:To efficiently wash dishes stored in a rack over the whole by rotatably fitting rotary nozzle arms having multiple jet nozzles to multiple washing branch pipes arranged in a washing tank respectively in nearly the same plane. CONSTITUTION:Multiple washing branch pipes 152 are arranged in a washing tank 101, and rotary nozzle arms 111 having multiple jet nozzles 113, 113' are rotatably fitted to the washing branch pipes 152 respectively in nearly the same plane. The horizontal plane shape of the washing tank 101 is made square, and four washing branch pipes 152 are arranged at nearly the center sections of portions of the washing tank 101 divided into four respectively, or the horizontal plane shape of the washing tank 101 is made rectangular, and two washing branch pipes 152 are arranged at nearly the center sections of portions of the washing tank 101 divided into two respectively. The washing capability for the total area of the washing tank 101 can be made uniform over the whole, and the most reasonable layout for the angular washing tank 101 can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher suitable for commercial use.

[0002]

2. Description of the Related Art Currently, about 90% of box-type dishwashers used for business use a rotary nozzle jet type manufactured in the United States more than 50 years ago as a basic structure.

A typical structural example of such a "rotary nozzle jet type" will be described with reference to FIGS. First, 1
Is a washing tank, which is a square tank having a side of approximately 60 cm, and inside of which is kept washing water 2 having a constant water level and a constant cleaning concentration. A flange 20 is formed on the upper edge of the cleaning tank 1. A cleaning pump 3 is driven by a cleaning pump motor 4. The suction port 5 is connected to the bottom portion of the cleaning tank 1, and an upper portion of the suction port 5 has a certain size or more contained in the cleaning water 2 sucked from the suction port 5 (food leftovers). A strainer 7 having a large number of passage holes 6 is provided so as not to pass through. The cleaning water 2 pressurized by the cleaning pump 3 is the cleaning tank 1
From the discharge port 8 connected to the above, the lower conduit 9 and the upper conduit 10 in the cleaning tank 1 are separately flown. Reference numeral 11 denotes a lower cleaning nozzle arm. The lower cleaning nozzle arm 11 has a total length of about 50 cm, and has a nozzle ejection port 12 and a nozzle ejection port 1 near the outer peripheral portion.
A pipe 1 having a total of 6 and 8 jet nozzles 3 and 13 'and forming a double conduit at the center of the lower conduit 9.
It is rotatably held by a bearing 15 with 4 as a rotation axis.

The upper end of the pipe 14 is closed with a blind plug 15a, and several opening holes 16 are opened in the middle thereof. 18 is a rinsing nozzle arm, and bearing part 17 is pipe 1.
4 rotatably engaged with the rinse nozzle arm 1
In 8, 8 to 10 rinse nozzle tips 19 are planted.

Reference numeral 21 denotes a rinse pump. The rinse pump 21 is driven by a rinse pump motor 22, sucks rinse water 26 stored in a rinse tank 25 through a suction port 23, and pressurizes it at a discharge port 24 to wash the washing tank 1. Through the inner rinse conduit 27, the lower rinse conduit 28 and the upper rinse conduit 2
Introduce to 9.

The cleaning water 1 pressurized by the cleaning pump 3 is introduced into the lower cleaning nozzle arm 11 through the lower conduit 9, and a part of the cleaning water 1 passes through the upper cleaning conduit 10 and the upper spray provided at the upper part. It is also introduced into the nozzle arm 30 and ejects from the upper nozzle ejection port 31.

Rinsing water 2 pressurized by the rinsing pump 21
6 is introduced into the lower rinsing conduit 28 through the rinsing conduit 27, and a part thereof passes through the upper rinsing conduit 29 so that the rinsing water 26 is ejected from the rinsing nozzle tips 32 provided at the upper four corners. Is becoming

Reference numeral 35 denotes a tableware rack, which has a basket-like structure so as not to interfere with the spraying of the washing water 2 from below, so that the glass 36 of the tableware and the bowl 37 of the tableware do not collide with each other. It has a proper partition and is designed to maintain a posture that makes it easy to wash.
The size of the tableware rack 35 is standardized to 50 cm × 50 cm, and there are various types depending on the use such as glass, bowl, and plate.

Reference numeral 41 is a hood for preventing the washing water 2 from splashing outside during washing, and when the tableware rack 35 containing the tableware 36, 37 is taken in and out, the hood 41 is lifted up. Reference numeral 42 denotes a pedestal, which houses the cleaning pump 3, the rinsing pump 21, the rinsing water tank 25, and a control box (not shown), and is supported by four legs 43. The cleaning water 2 pressurized by the cleaning pump 3 enters the cleaning nozzle arm 11 through the lower conduit 9, is ejected from the nozzle ejection ports 12 and 13, and ejects the cleaning water 2 from below toward the dishes 36 and 37. However, in order to obtain a propulsive force that rotates by the reaction force that ejects the lower cleaning nozzle arm 11, the nozzle ejection ports 13 and 13 ′ on the outer peripheral portion eject vertically from other nozzles.
Eject at an angle of about 30 ° in the horizontal direction, and as a result,
The cleaning water 2 is spouted while rotating at a speed of 1 to 2 times per second.

On the basis of the same principle, the upper jet nozzle arm 30 also rotates to jet hot water.

Also, when the rinse water 26 pressurized by the rinse pump 21 reaches the rinse nozzle arm 18 and is jetted from the rinse nozzle tip 19, the nozzle tip 19 in the outer peripheral portion is horizontally rotated about 30 ° from the vertical direction. By tilting the nozzles to eject the rinse water, a rotational driving force is applied to the rinse nozzle arm 18, and the rinse water is ejected while rotating at a speed of about once per second.

The dishwasher having such a structure is for business use, and the time required for each dishwashing is very different from that of a household dishwasher, and the washing and rinsing steps are automatically performed in about 1 minute. Must be done.

In FIG. 3, auxiliary tables 50 and 51 are engaged with each other on the left and right sides of the washing machine in order to efficiently wash the dishes, and precleaned dishes are packed in the table rack 35 'with the auxiliary table 50. Open the hood 41 upwards, slide it into the center of the washer and pull down the hood 41. The hood 41 interlocks with the start switch of the washing machine to lower the hood, so that the washing pump motor 4 is operated first, and the washing pump 3 sucks the washing water 2 stored in the washing tank 1 and discharges the discharge pipe 7. It is sent to the lower cleaning nozzle arm 11 via the cleaning nozzle 2 and the cleaning water 2
Nozzle arm 1 by the propulsive force when ejecting
The reference numeral 1 spouts the washing water 2 while rotating to give a water flow impact to the dishes 36 and 37. On the other hand, the cleaning water 2 pressurized by the cleaning pump 3 simultaneously reaches the upper cleaning nozzle arm 30 through the upper cleaning conduit 10 and is ejected from the nozzle ejection port 31 (rotating similarly to the lower cleaning nozzle arm 11). Meanwhile, the impact water flow of the wash water 2 is applied from the upper side of the dishes 36 and 37. The washing pump 3 is operated and stopped for about 45 seconds. After that, the rinse pump motor 22 automatically starts operation at intervals of several seconds. Rinse pump 21
Is the rinse water 2 previously stored in the rinse water tank 25.
6 is sucked, reaches the rinsing nozzle arm 18 from the discharge port 24 via the conduit 28, and the rinsing water 26 is ejected from the nozzle tip 19 while the rinsing nozzle arm 18 rotates, and rinsing is automatically performed. Rinse pump 2 at the same time
The rinse water 26 pressurized at 1 passes through the upper conduit 29,
The rinsing nozzles 32 arranged at the four corners of the upper portion also eject the rinsing nozzles 32 to perform rinsing from above. The rinsing pump 21 is operating for 10 to 15 seconds, and when this rinsing is completed, a buzzer notifies the completion of a series of steps of cleaning → rinsing, or the hood 41 is automatically opened upward. 1
Finish the work for each round. Thus, the total time of 45 seconds of washing → a few seconds of rest → 12 seconds of rinsing is about 1 minute. When one step is completed, the table is pulled out toward the table 51 in FIG. 3, and then the tableware rack 35 'containing the precleaned tableware 36, 37.
Is put into the washing machine and the hood 41 is pulled down to start the next step.

As described above, since the dirty dishes 36 and 37 must be washed thoroughly within 45 seconds,
The discharge flow rate and discharge pressure of the cleaning pump 3 and the number and shape of the nozzle jet outlets 12 and 13 with respect to the cleaning nozzle arm 11 are important factors.

As can be seen from FIG. 1 and FIG. 2, the dirty tableware packed in the tableware rack 35 is directed downward in the case of the glass 36, and diagonally downward in the case of the bowl 37 so that the tableware and the tableware are overlapped. The table rack 35 is provided with a partition or a protrusion so as not to exist.

As can be seen from FIGS. 1 to 3, the tableware rack 35 is located between the lower cleaning nozzle arm 11 and the upper cleaning nozzle arm 31, and dirty dishes are sprayed with water from below and from above. Although it is washed while being washed, in the case of the glass 36 and the bowl 37, the jet of water from the bottom has a very large weight on the washing result. This is because the jet of water from the bottom directly hits the dirt adhering to the opening of the glass 36, and even in the case of the bowl 37, it directly sprays the dirt on the inside. This is because the wash water 2 ejected from the nozzle port 31 of 30 can only wash the bottom of the glass 36 and the bottom of the bowl 37.

FIG. 3 shows a case where the dish 52 is leaned upright on the tableware rack 35 and washed,
Since such a posture may be used when washing the water, in this case, it can be said that the jet water flow from the upper jet nozzle arm 30 has a great influence on the stain removal and is more important than the jet from the lower jet nozzle arm 11. However, in the case of the dish 52 as well, if the rack 35 is packed diagonally downward and washed like the bowl 37, the injection from the lower injection nozzle arm 11 is more important than the injection from the upper injection nozzle arm 30. become. In any case, in the dishwasher, the cleaning water jet from the lower jet nozzle arm 11 has a very important effect as compared with the upper jet nozzle arm 30.
This can be known from the fact that in the case of the simple type of the dishwasher for business use, there is no upper injection nozzle arm but only the lower injection nozzle arm, which is useful. In the case of Japan, the shape of tableware is more diverse than in Europe and the United States, and unlike the Western-type dish-based type, there are many bowls, bowls, deep bowls, lunch boxes, glasses, etc. The cleaning result will be greatly affected.

As mentioned at the beginning, the United States has a history of 50 years, and even in Japan, the dishwasher having the structure described in FIGS. 1 to 3 occupies 90% for commercial use. The main reason seems to be that the structure is simple and the washing pump 3 is small (1/2 horsepower to 1 horsepower).

However, such a "rotary nozzle jet type" has drawbacks described later, and its cleaning power is not always satisfactory to the user.

Here, referring to the height problem of the dishwasher described so far, in FIG. 3, the height of the dish rack 35 from the floor surface is about 80 cm due to the horizontal engagement with the work table. It is kept. (In Western countries,
It is 85 to 90 cm. ) Therefore, it is necessary to keep the upper edge of the main body of the washing machine at 80 cm, and as a typical average value within this height range of 80 cm, the washing tank 1 is about 30 cm, and the pedestal 4
In order to store the pump 3, the pump 21 and the rinsing tank 25 in 2, the mount 42 is about 40 cm and the legs 43 are about 10 cm.
The total is 80 cm.

The washing tank 1 has a rinsing nozzle arm 18 and a lower jet nozzle arm 11 from above, and the washing water 2 is stored under the rinsing nozzle arm 18. Thus, the lower jet nozzle arm 11 generally makes a rotary jet about 12 cm below the tableware rack 35, and when the wash water 2 is jetting from the nozzle jet outlets 12 and 13, the wash water jetted from the jet outlet is shown. 2 passes through the tableware rack 35 while opening in a fan shape of about 30 ° and hits the tableware 36.

In FIG. 4, it was explained that the space between the tableware rack 31 and the lower jet nozzle arm 11 is generally 12 cm, but if the distance is further increased to about 20 cm, the jet water flow reaches the tableware rack 35. By opening in a fan shape, the range covered by the jet stream increases, and the tableware rack 3 of FIG.
Although it is possible to cover the four corners of No. 5 if not sufficient, it is difficult to rotate the lower injection nozzle arm 11 while keeping the distance of 12 cm or more for the above-mentioned reason.

If the distance is increased to about 20 cm, the jet flow opens in a fan shape and the area covered by the jet flow increases, but the force of the water flow weakens in inverse proportion to the square of the distance. It cannot be said that it is always good when considering the detergency.

[0024]

[Problems to be Solved by the Invention]

(1) As described above, the rotary nozzle spray type is cleaned by spraying cleaning water from the lower spray nozzle arm 11 and the upper spray nozzle arm 30 provided above and below the tableware to be cleaned. It was also described that the jet from the lower jet nozzle arm 11 has a greater influence on the cleaning result than the jet from the upper portion.

Here, the tableware rack 35 is 50 cm × 50 cm.
The lower injection nozzle arm 11 has a total length of about 5
In the case of 0 cm, as shown in FIG. 6, the lower jet nozzle arm 11 is rotating about 12 cm below the tableware rack 35, so that the nozzle jet ports 13 provided at both ends of the lower jet nozzle arm 11 The jet water flow is 4 of the tableware rack 35.
The tableware in the corner will not reach well and will not be washed well. That is, the dishes placed in the shaded area in FIG. 6 are insufficiently washed. In order to avoid this, as shown in FIG.
If the nozzles are made longer to cm and the nozzle injection ports 13 at both ends of the lower injection nozzle arm 11 are provided, the injection will reach even the tableware at the four corners of the tableware rack 35. The unnecessary injection will be performed on the shaded portion outside the. Since the area of this shaded area is about 50% of the area of the tableware rack 35, it is 50%.
It will needlessly inject fuel into the area of the product, the output of the pump will need to be increased by 50%, and it will be 70 cm.
In order to rotate the lower jet nozzle arm 11, the main body of the washing machine becomes at least 80 cm square and becomes large in size, which is not practical. Therefore, as shown in FIG. 6, the length of the lower jet nozzle arm 11 is about 50 cm, and it is known that the dishes at the four corners of the dishes placed on the rectangular dish rack 35 of 50 cm × 50 cm are insufficiently washed. Then, the machine body is 60 cm x 60
It is common to collect in cm and choose a pump that can be a small pump.

(2) In FIG. 5, when the pressure of the jet water flow from the lower jet nozzle arm 11 is increased, the amount of jet water and the jet impact are increased. As a result, the cleaning power is increased, but the upper jet nozzle arm 30 is Since it does not rotate in synchronization with the arm 11, light dishes are blown off or rattled.

In order to eliminate these disadvantages (1) and (2), a fixed nozzle jet is provided in which a large number of fixed nozzles are arranged above and below the table as shown in FIG. The method has been put to practical use. In the case of this method, the washing water 2 is thoroughly sprayed to the four corners, and the spray from the top and bottom is always balanced, so there is little rattling of the dishes, but it is sprayed entirely from many nozzles. The size of the pump is large, and the structure of multiple nozzles at the top and bottom complicates the structure, making the product price expensive and becoming a bottleneck for widespread use.

(3) In the rotary nozzle jet type, FIG. 9 shows a case where the outer peripheral jet nozzle 61 and the inner peripheral jet nozzle 63 arranged on the rotary nozzle arm 65 for the tableware rack 60 respectively jet while rotating. The area of the sprayed area is the range of the hatched portion 62 of the outer peripheral jet nozzle 61,
The inner peripheral ejection nozzle 63 has an area of a range for ejecting with respect to the range of the shaded portion 64.

Therefore, the area of the shaded portion 62 is 25 ² π-20 ² π = 0.696 m ² ... A The area of the shaded portion 63 is 10 ² π-5 ² π = 0.235 m ² ... B A: B = 2 It becomes 96: 1.

As a result of the above calculation, each nozzle 61, 63
When the width is 5 cm, the outer peripheral ejection nozzle 61
And the area covered by the inner peripheral jet nozzle 63 are approximately tripled, and if the amount of water sprayed per nozzle is the same, the cleaning power is determined by the amount of water sprayed per unit area. Therefore, it can be proved in principle that the outer peripheral portion has a weaker cleaning power than the inner peripheral portion. Further, as described in the previous section, since the outer peripheral ejection nozzles 61 on the outer peripheral portion must eject also on the tableware placed on the corners 66 at the four corners of the tableware rack 60, the four corners of the corners 66 are ejected. In addition to the insufficient cleaning, the tableware placed on the outer peripheral portion of the shaded portion 62 has a theoretical drawback that the cleaning power is inevitably weaker than the inner peripheral portion.

In order to eliminate this drawback, the rotary nozzle arm 6
This is supplemented by adding injection nozzles 67 for the injection of the outer peripheral portion to the outer peripheral portion of No. 5, but this is not a fundamental improvement measure.

In the above, the rotary nozzle injection method which has been widely used in the past has been described, and the drawbacks and the like of the rotary nozzle injection method have been touched upon. In addition, the four-rotor nozzle injection type according to the embodiment of the present invention described below is a method that supplements the drawbacks of the rotary nozzle injection type and is far superior to the conventional rotary nozzle injection type in its structure and cleaning power. explain.

(4) Further, it is desirable that the glass cups are processed in a service area close to the seats of the customers without carrying them to a dedicated washing place. For that purpose, the outer diameter of the dishwasher is a full-size rack. A large installation space is required, and a small dishwasher that can be installed in the service area is desired.

[0034]

The invention according to claim 1 is
A plurality of washing branch pipes were arranged in the washing tank, and a rotary nozzle arm having a plurality of nozzle injection ports was rotatably attached to each of these washing branch pipes while being positioned in substantially the same plane.

According to a second aspect of the present invention, the horizontal shape of the cleaning tank is formed into a square shape, and four cleaning branch pipes are provided, and the cleaning tanks are arranged at substantially central portions which are divided into four parts.

According to the third aspect of the present invention, the horizontal shape of the cleaning tank is formed into a rectangular shape, and two cleaning branch pipes are provided, and the cleaning tank is arranged in each of the substantially central portions divided into two parts.

According to a fourth aspect of the present invention, a plurality of cleaning branch pipes are arranged in the cleaning tank, and rotary nozzle arms having a plurality of nozzle injection ports are provided in each of the cleaning branch pipes in substantially the same plane. Rotatably mounted, a rinse water conduit is arranged in the central portion of the cleaning tank, and one rinse nozzle arm having a plurality of rinse water injection nozzles is rotatable in the rinse water conduit. Connected.

[0038]

According to the first aspect of the present invention, a plurality of rotary nozzle arms for cleaning are provided in the same plane, whereby the cleaning ability can be made uniform over the entire area of the cleaning tank.

According to the second aspect of the present invention, the most rational arrangement can be made with respect to the currently used square-shaped cleaning tank.

Further, according to the third aspect of the present invention, it can be installed in a service area or the like having a small installation space, and the glass or the like can be washed near the seats of the passengers.

According to the invention described in claim 4, the cleaning nozzle structure including the respective rotation centers is realized by an extremely simplified structure, and a rinsing nozzle shaft is provided in the central space, so that a complicated double structure is provided. A simple structure that does not depend on the shaft structure can be achieved, and with the plastic structure of the rotating nozzle arm, it is possible to realize a dishwasher with a lower cost and higher performance than the old type in the total structure.

[0042]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention is shown in FIGS.
It will be explained based on. FIG. 10 is a structural view showing a main cross section of the four-rotor nozzle washing machine according to this embodiment, and FIG. 11 is a perspective view of the main part.

In these drawings, cleaning water 102 is stored in the cleaning tank 101. This wash water 102
It passes through a large number of small holes 106 formed in the strainer 107, reaches the cleaning pump 103 via the suction port 105,
It is set so that it is pressurized by the cleaning pump 103 and again passes through the discharge conduit 109 in the cleaning tank 101 to reach the four rising pipes 152, 152 'from the four-way branch pipe 151. The end 153 of these four riser pipes 152, 152 '
Is a blind cap. Immediately below this blind cap are 3 to 4 holes 15 on the side surfaces of the riser pipes 152, 152 '.
4 is opened, and the cleaning water 102 is set so as to flow into the four rotary nozzle arms 111 from this hole 154.

Further, the rotary nozzle arm 111 is formed with two nozzle ejection ports 113 on the outer peripheral portion thereof and one nozzle ejection port 113 'is formed near the inner peripheral portion thereof.
The washing water 102 is ejected from the nozzle ejection ports 113 and 113 ', and the dishes 13 packed on the table rack 135 are ejected.
6, 137 is set to inject the jet water flow.

Here, the cleaning water 102 pressurized by the cleaning pump 103 is further branched from the upper part of the four-way branch pipe 151, flows out to the upper injection cleaning nozzle by the upper cleaning conduit 110, and is injected and cleaned from the upper part. However, as described above, in the case of dishwashing, the lower cleaning jet plays a more important role in the cleaning result than the upper cleaning jet, so the detailed description of the upper cleaning nozzle structure will be omitted. We will proceed.

Next, in FIG. 13, one of the two nozzle outlets 113 on the outer peripheral portion is set so that the nozzle outlets are inclined about 30 ° from right above because they rotate by themselves. It is supposed to rotate at a speed of 2 to 3 times per second.

The rotating nozzle arm 111 shown in FIG.
When viewed from above the tableware rack 135, the tableware rack 13 is placed on the same plane so as not to collide with each other even when the four rotary nozzle arms 111 rotate as shown in FIG.
It is arranged so that the area of 5 is divided into 4 equal parts. That is, the four rotary nozzle arms 111 are arranged in the same plane, and the tableware rack 135 is arranged in a plane.
Each rotary nozzle arm 111 is provided at the substantially divided center.

In the case of the conventional rotary nozzle injection described in FIGS. 1 and 2, as in the case shown in FIG. 5, the tableware rack 3 is used.
The washing water 2 does not reach the tableware 36 placed in the corners of the table 5 sufficiently, resulting in insufficient cleaning. However, according to the present embodiment, the areas of the tableware rack 135 at the four corners where the cleaning is insufficient are as follows: As shown by the shaded area 160 in FIG. 12, the wash water 102 that is extremely small and is sprayed from the nozzle ejection port 113 on the outer peripheral portion of the rotary nozzle arm 111 opens in a fan shape and then dishes ware 136,13.
7, the cleaning water 102 does not spread and the cleaning failure does not occur.

The same applies to the shaded portion 162. That is, the shaded portion 162 is covered by four of the nozzle ejection openings 113 of the two rotary nozzle arms 111, and the shaded portion 163 of the central portion is covered by eight of the four outer peripheral nozzle ejection openings 113. Therefore, it is possible to spread the entire inner surface area of the tableware rack 135 by spraying the sufficient cleaning water 102.

The above points will be described in more detail with reference to FIGS. 14 and 15. First, the tableware rack 135 is made to have a size of 50 cm × 50 cm, four rotary nozzle arms 111 are rotated on the same plane about 12 cm below the tableware rack 135, and two nozzle nozzles 113 at the outer peripheral portion are provided. If the number of nozzle nozzles 113 'in the peripheral portion is one and the jetting angle of the cleaning water 102 from each nozzle nozzle 113, 113' is about 30 °, the jetting cross section becomes as shown in FIG. The range of the jet water flow that hits the bottom of the tableware rack 135 when viewed from above is as shown in FIG.

As a result, four rotary nozzle arms 111
The total length of the nozzle is 242 mm, and the distance between the nozzle ejection ports 113 is 225 mm.
mm, the distance from the center of the nozzle jet 113 'is about 40 mm
Then, as can be seen from FIGS. 14 and 15, almost 1/4 of the tableware rack 135 can be covered.

By the way, in FIG. 15, the donut-shaped portion is covered by the two nozzle ejection ports 113 on the outer peripheral side, and the area of the portion is 439 mm ^2. Therefore, each one is 220 mm. It will be divided into ^two . on the other hand,
The area of the portion shown on the inner peripheral side is 176 mm ² , and this portion is covered by one nozzle ejection port 113 'on the inner peripheral side. Therefore, the ratio of the shared area per nozzle of the outer peripheral side nozzle ejection port 113 to the allocated area of one per nozzle of the inner peripheral side nozzle ejection port 113 'is 1.25: 1.0. The spout 113 covers a 25% larger area. However, this difference is a small difference as compared with the conventional rotary nozzle injection method, and it means that almost uniform injection cleaning is performed up to the outer peripheral portion and the inner peripheral portion with practically no trouble.

From the above results, according to the 4-rotor injection type, almost uniform spray cleaning can be obtained over the entire area of the tableware rack 135, and it seems that the four corners of the tableware rack are insufficiently cleaned as in the conventional case. Nothing goes away.

By the way, the lower rotary nozzle arm 11 shown in FIGS. 1 and 2 has a total length of about 50 cm, and the four rotary nozzle arms 111 of this embodiment have a total length of about 24 cm, which is 1/2 the length. It is said that. Here, the nozzle arm 11 of 50 cm has to be made as a metal casting or a pressed product in order to maintain mechanical strength, but since the rotary nozzle arm 111 of this embodiment is short and small, it is a molded product of plastics. With that, the strength can be sufficiently maintained. When it is made of plastics, the bearing portion 115 of the rotary nozzle arm 111 is fitted and rotated about the upper portion of the rising pipe 152 in FIG. 13 as the rotation axis. Since it is made of stainless steel, when it is fitted into the bearing 115 and rotates,
Since the plastic bearing rotates about the metal as the central axis, it is possible to maintain durable rotation without using a special rotating bush. Further, the rotary nozzle arm 111 receives a downward reaction force by the cleaning water 102 being jetted from the nozzle jet ports 113 and 113 ′, and the thrust stopper 171 and the rotary nozzle arm 111.
The sliding portion 170 on the lower surface of the roller always rotates while being pressed. At this time, in the case of metal, it is necessary to insert a plastic bush in order to reduce frictional force. In the case of the embodiment, since the entire rotary nozzle arm 111 is a plastic molded product, no special bush is required.

Therefore, according to the present embodiment, since the rotary nozzle arm 111 can be small in size, it can be made as a plastic molded product to maintain sufficient mechanical strength.
The thrust bearing is equivalent to being integrally formed, and the rotation of the rotating portion can be lightly rotated while maintaining the durability with a simple structure, which can be realized at a very low cost.

Further, in the conventional machine shown in FIGS. 1 and 2, as described above, the double conduit system constituted by the rinse introducing pipe 14 concentrically inside the wash water conduit 9 is used, and each bearing part is provided. Requires a bearing bush to reduce friction and prevent wear, and the bearing gap must be kept small to prevent unnecessary water leakage from the bearing portion. As a result, the structure becomes complicated, and when the nozzle arm 11 is attached or detached, the rinsing nozzle arm 18 must be removed. In this regard, according to this embodiment, as can be seen from FIG. 13, the four rotary nozzle arms 111 are integrally formed with the nozzle ejection ports 113 and 113 ′, the bearing portion 115, and the thrust bearing portion 170. The riser pipe 152, which is a plastic part and serves as a central axis of rotation of the plastics part, for inducingly introducing the washing water 102, can be realized with a simple structure in which the rising pipe 152 is integrated with the bearing 115. Similarly, as can be seen from FIG. 13, the rotary nozzle arm 111 can be easily inspected and cleaned by simply mounting it from directly above and inserting it into the rising pipe 152.

Further, when considering a commercial-use washing machine, the rotating nozzle arm and the rinsing nozzle arm are always composed of separate water channels and parts. Here, conventionally, the nozzle arm 11 and the rinsing nozzle arm 18 are configured such that the rotation center is coaxial with the center of the washing machine, as can be seen from FIGS. 1 and 2. For this reason, a double conduit is required. In this regard, according to this embodiment, the four rotary nozzle arms 111 are provided.
As can be seen from FIG. 15, there are four locations at a certain distance from the center of the washing machine, and a central portion 172 in FIG. 15 has a four-way branch pipe 151 at the bottom of the washing tank 101 as seen from FIG. Other than that, the upper part becomes a space and is vacant. In order to use the empty space as the center of rotation of the rinse nozzle arm 118, it is possible to achieve the upright position of the lower rinse conduit 114 in FIG. 10 with a very simple structure.

Next, a second embodiment of the present invention will be described with reference to FIGS. The same parts as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted. The present embodiment relates to a washer for exclusive use with a half-size rack in which the planar shape of the tableware rack is formed into a rectangular shape having a ratio of short sides to long sides of 1: 2. Conventionally, there is only one half-size rack cleaning machine
This nozzle type could not be realized. Further, although it can be realized by adopting a type in which a fixed nozzle is used to spray from above and below, this type has a problem that the structure becomes extremely complicated. However, the half-size rack-dedicated washer of this embodiment is just half the size of that shown in FIG. A specific example of this will be described with reference to FIG. First, the tableware rack 201 has a planar shape of 25 × 50 cm, which is half the shape of the tableware rack 135 shown in the first embodiment. Such a tableware rack 201 has a size of 25 × 50.
It is widely used as a half-size rack in addition to the cm full-size rack. This tableware rack 20
Two rotary nozzle arms 111 are arranged under 1, and two rotary nozzle arms 211 having the same shape as the rotary nozzle arm 111 are arranged on the tableware rack 201.

The lower two rotary nozzle arms 111 are
Each of the rotary nozzle arms 11 is divided by the branch pipe 203.
1, the washing water is distributed to the upper rotary nozzle arm 211.
The washing water is sent from the horizontal branch pipe 205 to the vertical branch pipe 204. Reference numeral 209 denotes a pool of washing hot water, and the washing hot water stored therein passes through the strainer 207 to the suction port 208 of the pump 202, is pressurized by the pump 202, and rises from the rising pipe 210 to the central portion of the washing tank. The rotating nozzle arms 111, 21 which are guided and pass through the branch pipes 203, 204, 205 in the cleaning tank, and are provided two above and below.
Spout hot water from 1.

Next, reference numeral 206 denotes a casing for preventing the wash water from splashing to the outside, and this casing 206 is provided with a door (not shown) for loading and unloading the tableware rack 201.

By doing so, the planar shape becomes 2
The tableware packed in the tableware rack 135 having a flat portion of 5 × 50 cm can be effectively sprayed with the washing water by spraying the tableware from above and below, and the casing 206 is used as the first embodiment. It can be about half the size of the full-size rack dishwasher shown in. An application of such a half-sized dishwasher is cleaning glass cups. It is desirable to process glasses and cups in a service area close to the seats without carrying them to a dedicated washing area.To do this, if the external dimensions of the dishwasher are half the size of a full-size rack dishwasher. It can be placed in a service area close to the seats, and has a short work flow line without having to carry it into a washing room separately from general tableware, and can efficiently wash glass and cups.

[0062]

According to the first aspect of the present invention, a plurality of cleaning branch pipes are arranged in the cleaning tank, and each of the cleaning branch pipes has substantially the same rotary nozzle arm having a plurality of nozzle injection ports. Since it is positioned in a plane and rotatably mounted, there are a plurality of rotary nozzle arms for cleaning in the same plane, which makes it possible to make the cleaning capacity uniform over the entire area of the cleaning tank. According to the invention of claim 2, the horizontal shape of the cleaning tank is formed in a square shape, and four cleaning branch pipes are arranged in each of the substantially central portions of the cleaning tank divided into four parts. The most rational arrangement can be made to the cleaning tank of the mold, and the invention according to claim 4 further comprises a plurality of cleaning branch pipes arranged in the cleaning tank, and each of these cleaning branch pipes is arranged. Multiple nozzle outlets One rotary nozzle arm is rotatably mounted in substantially the same plane, a rinse water conduit is arranged in the central portion of the cleaning tank, and one rinse water conduit has a plurality of rinse water injection nozzles. Since the rinsing nozzle arm of is rotatably connected, the cleaning nozzle structure including each rotation center is realized by an extremely simplified structure, and
By providing a rinsing nozzle shaft in the central space, a simple structure that does not rely on a complicated double shaft structure can be achieved. With the plastic molding of the rotating nozzle arm, the total structure is cheaper and higher in performance than the old model. According to another aspect of the present invention, the horizontal shape of the washing tank is formed in a rectangular shape, and two washing branch pipes are provided, and the washing tank is arranged in each of the substantially central portions. Since it is installed, it can be installed in a service area or the like where the installation space is small, and it is possible to wash glasses and the like near the passenger seats.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an example of a conventional dishwasher.

FIG. 2 is a perspective view with a part cut away.

FIG. 3 is a front view with a part cut away when assembled as a set.

FIG. 4 is a front view showing a relationship between a lower jet nozzle arm and tableware.

FIG. 5 is a perspective view showing a relationship between a lower jet nozzle arm, tableware, and an upper jet nozzle arm.

FIG. 6 is a plan view showing a relationship between a rack and a lower jet nozzle arm.

FIG. 7 is a plan view showing another relationship between the rack and the lower jet nozzle arm.

FIG. 8 is a perspective view of a fixed nozzle injection method.

FIG. 9 is a plan view showing injection ranges of an inner peripheral portion and an outer peripheral portion.

FIG. 10 is a vertical sectional side view showing a first embodiment of the present invention.

FIG. 11 is a perspective view of a part thereof.

FIG. 12 is a plan view thereof.

FIG. 13 is an exploded perspective view of a rotary nozzle arm portion.

FIG. 14 is a vertical sectional side view showing an injection state.

FIG. 15 is a plan view showing an injection area by one rotating nozzle arm.

FIG. 16 is a plan view showing a second embodiment of the present invention.

FIG. 17 is a perspective view with a part cut away.

[Explanation of symbols]

 101 Cleaning Tank 111 Rotating Nozzle Arm 113, 113 'Nozzle Injection Port 114 Rinse Water Conduit 118 Rinse Nozzle Arm 119 Rinse Water Injection Nozzle 152 Cleaning Branch Pipe

Claims (4)

[Claims] 1. A plurality of cleaning branch pipes are arranged in a cleaning tank, and a rotating nozzle arm having a plurality of nozzle injection ports is located in each of these cleaning branch pipes and is rotatable substantially in the same plane. A dishwasher characterized by being attached to. 2. The horizontal shape of the cleaning tank is formed into a square shape,
2. The dishwasher according to claim 1, wherein there are four washing branch pipes and the washing tanks are respectively arranged at substantially central portions which are divided into four. 3. The dish washing according to claim 1, wherein the horizontal shape of the washing tank is formed in a rectangular shape, and two washing branch pipes are provided at each of the substantially central portions of the washing tank. Machine. 4. A plurality of cleaning branch pipes are arranged in a cleaning tank, and a rotating nozzle arm having a plurality of nozzle injection ports is located in each of these cleaning branch pipes and is rotatable in substantially the same plane. And a rinse water conduit is arranged in the central portion of the cleaning tank, and one rinse nozzle arm having a plurality of rinse water injection nozzles is rotatably connected to the rinse water conduit. Dishwasher to do.