JP2734740B2 - Dishwasher - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher for washing dishes by spraying washing water, and more particularly to a dishwasher having a feature in a washing nozzle.

2. Description of the Related Art In a dishwasher using a conventional arm nozzle, washing water cannot be sufficiently sprayed on tableware outside the range of the rotation locus of the arm nozzle. In particular, in a dish having a washing tank and a dish basket having a rectangular cross section having a large difference between the width dimension and the depth dimension, since the rotation trajectory of the arm nozzle is limited to a shorter side of the rectangle or less, the dish in the corner of the dish basket is formed. Cleaning performance was poor.

In order to solve this drawback, the inventors have previously proposed (filed) a dishwasher as shown in FIG. In this dish washer, as a washing nozzle, a rod-shaped nozzle 2 formed in the longitudinal direction of the washing tank 1 in a space where a tableware basket is arranged vertically in the washing tank 1, and a washing water flow path from one end of the rod-shaped nozzle 2. And a propulsion nozzle 3 provided with an opening by extending the first cleaning nozzle, and a second cleaning nozzle including an arm nozzle 4 that rotates substantially horizontally is provided in the lower space of the lowermost tableware basket. In the washing process, the rod-shaped nozzle 2 sprays washing water onto the upper and lower tableware baskets while rotating the rod-shaped nozzle 2 around the axis of the rods by the propulsion nozzles 3, and at the same time, the tableware baskets are sprayed from the arm nozzles 4. Can efficiently wash the dishes arranged in the corners of
A dishwasher with high washing performance could be provided.

However, in the cleaning nozzle having the above-described structure, however, the gap 5a and the gap 5b between the rod-shaped nozzle 2 and the propulsion nozzle 3 as shown in FIG. Since a constant flow rate of the washing water is leaked, a large washing pump 6 capable of supplying the leaking loss power in addition to the required water power required for the washing is required, and the operation noise at the time of washing becomes high. is there.

Further, the supply line of the washing water is connected to the tip 5c of the nozzle bearing 5.
As a result, a pipe loss occurs due to branching into the rod-shaped nozzle 2 and the propulsion nozzle 3 and a sudden increase in cross-sectional area, so that the jet pressure of the washing water from the rod-shaped nozzle 2 decreases. Therefore, the cleaning performance is reduced unless the large cleaning pump 6 is used.

Further, when the gap 5a and the gap 5b are set to be small in order to reduce leakage power loss in the nozzle bearing 5,
Fine residues (dirt attached to tableware) and foreign matters such as sand and lint accumulated in the washing water are deposited, resulting in poor rotation of the washing nozzle and poor washing.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a first object is to reduce a hydraulic power loss due to leakage from a nozzle bearing and obtain a required hydraulic power required for cleaning with a small cleaning pump. It is an object of the present invention to provide a dishwasher in which washing noise is reduced and a pipe loss in a nozzle bearing is reduced, so that a higher washing performance can be obtained with a small washing pump.

Further, a second object of the present invention is to provide a highly reliable dishwasher with a washing nozzle configuration which reduces leakage loss from a nozzle bearing and a pipe loss, and at the same time, does not accumulate fine residue and foreign matter. Things.

Means for Solving the Problems In order to achieve the first object, the present invention provides a washing tank, a tableware arranged in multiple stages in the washing tank, and a tableware arranged between the tableware baskets arranged in multiple stages. A cleaning nozzle that injects the cleaning water, and a nozzle bearing that supports one end of the cleaning nozzle and feeds the cleaning water, wherein the cleaning nozzle has a propulsion nozzle that branches a cleaning water path from the supported one end. A rod-shaped nozzle extending in the axial direction from the branch portion, and connected to the nozzle bearing by a cylindrical rotary seal shaft having an annular protrusion in contact with the cleaning nozzle and abutting against the inner bottom surface of the propulsion nozzle; The rotary seal shaft is formed by extending a substantially cylindrical guide pipe through which cleaning water is supplied to the rod-shaped nozzle, to the tip end side of the branch portion of the propulsion nozzle.

In order to achieve the second object, the invention of the present application has a configuration in which a plurality of ribs are formed in the axial direction at an inscribed portion between the guide pipe and the cleaning nozzle in addition to the above configuration.

The dishwasher of the present invention has the above configuration, and in the washing process, the annular projection formed on the outer periphery of the rotary seal shaft abuts on the inner bottom surface of the propelling nozzle and rotates by the propulsive force of the washing water pressure, and rotates.
The washing water is supplied from the nozzle bearings to the rod-shaped nozzle and the propulsion nozzle almost without leakage, so that the leakage power loss is reduced.

In addition, a cylindrical guide pipe that feeds washing water to the rod-shaped nozzle on the rotating seal shaft is formed to extend in the axial direction on the tip side from the branch to the propulsion nozzle, so that the nozzle bearing supply pipe The change in the cross-sectional area of the passage is reduced, the pipe loss is reduced, and the washing water is jetted from the rod-shaped nozzle at a pressure substantially equal to the washing water pressure at the nozzle bearing.

Further, in addition to the above configuration, by forming a plurality of ribs in the axial direction between the guide pipe and the rod-shaped nozzle, it is possible to reduce the leakage loss of the washing water and the pipe loss, and at the same time, to make the fine residue It is possible to secure a space that can be discharged without deposits and foreign substances accumulating in the cleaning nozzle.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, reference numeral 7 denotes a cleaning tank, 8 denotes a cleaning pump for injecting cleaning water in the cleaning tank 7, and 9 denotes a rod having a plurality of openings 9a for injecting cleaning water spirally or linearly provided in the axial direction. The nozzle 10 is a propulsion nozzle that branches the washing water flow path from one end of the rod-shaped nozzle 9 and rotates the rod-shaped nozzle 9 by the reaction force of the washing water injection from the opening 10a. One end of the rod-shaped nozzle 9 is fixed by screw fitting. ing. The rod-shaped nozzle 9 and the propulsion nozzle 10 are collectively referred to as a first cleaning nozzle 11. Reference numeral 12 denotes a nozzle bearing that supports one end of the first cleaning nozzle 11 and supplies cleaning water into the cleaning nozzle 11, and 13 denotes a propulsion force of the first cleaning nozzle 11 by the cleaning water pressure at an inner bottom surface of the propulsion nozzle 10. It is a rotating seal shaft to be supported. The rotary seal shaft 13 is screw-fitted to the nozzle bearing 12, and can be freely detached from the nozzle bearing 12 by removing the rod-shaped nozzle 9 from the propulsion nozzle 10. 14 is a packing for attaching the nozzle bearing 12 to the washing tank 7 in a water-tight manner, 15 is a support bracket for pivotally supporting the tip end of the rod-shaped nozzle 9 (the side opposite to the nozzle bearing 12), and 16 is the washing pump 8 from the washing pump 8 to the nozzle bearing 12. This is a water supply pipe that supplies cleaning water. Reference numeral 17 denotes a filter for collecting residual vegetables, and a lower portion thereof communicates with a suction port of the washing pump 8 and a suction port of the drainage pump 18. Reference numerals 19 and 20 denote tableware baskets for storing tableware, which are arranged in multiple stages in the washing tank 7 and are called an upper basket and a lower basket, respectively. Reference numeral 21 denotes an arm nozzle which rotates substantially horizontally and has an opening 21a for injecting washing water.
And a second cleaning nozzle for the above. The first washing nozzle 11 is disposed in the space between the upper and lower tableware baskets 19 and 20,
A second washing nozzle including an arm nozzle 21 is arranged in a lower space of the lowermost dish basket (the dish basket 20 in this embodiment). Reference numeral 22 denotes a heater for heating the cleaning water, reference numeral 23 denotes a water supply valve for supplying the cleaning water, and reference numeral 24 denotes a control device for controlling the operation of the cleaning pump 8, the drain pump 18, and the like.

The operation of the above configuration will be described below. A predetermined amount of detergent is put in, and dishes and the like are placed in the upper basket 19 in the washing tank 7,
It is stored in the lower car 20 and operation is started. First, when the cleaning water is supplied by energizing the water supply valve 23, the main cleaning step of pressurizing the cleaning water containing the detergent by the cleaning pump 8 and spraying the cleaning water from the rod-shaped nozzle 9 and the arm nozzle 21 is performed. The adhered dirt is washed away. The washing water containing dirt in this step is sent to the washing pump 8 while being filtered by the filter 17, and is repeatedly injected from the rod-shaped nozzle 9 and the arm nozzle 21 again. In the main washing step, the washing tank 7 is used.
The heater 22 provided therein is energized to heat the washing water, dishes and the like to a predetermined temperature. After the main washing process for a predetermined time, a draining process for draining dirty washing water is performed, and the washing water in the washing tank 7 is sent to a drain pump 18 while being filtered by a filter 17 and discharged out of the machine. Is done. Subsequently, a water supply step of newly supplying washing water, a rinsing step of rinsing dishware or the like contaminated with detergent or garbage by spraying the washing water from the rod-shaped nozzle 9 and the arm nozzle 21, The draining step of discharging to the outside is repeated four times in succession to complete the washing, and the residual vegetables are collected in the filter 17. In particular, the final rinsing step is heated to complete the cleaning step.

In this cleaning step, the rod-shaped nozzle 9 rotates around the axis of the rod-shaped nozzle 9 while using the reaction force generated by jetting the cleaning water from the opening 10a of the propulsion nozzle 10 as a driving force.
19. Since the washing water is sprayed from the opening 9a to the dishes in the lower basket 20, the dishes in the lower basket 20 are washed from both the upper and lower directions with the spray from the arm nozzle 21. Therefore, in the configuration of the conventional cleaning nozzle, small items such as knives and spoons stored in a special basket with a fine mesh bottom were difficult to clean and required excessive cleaning water power. If this is the case, the washing water is reliably jetted from above and below to small items, so that a predetermined washing performance can be obtained with low water power. Also,
The jet from the rod-shaped nozzle 9 can be jetted to the corner of the cleaning tank 7. Even if the cleaning tank 7 has a rectangular cross-section having a large difference in width and depth, the corners of the upper car 19 and the lower car 20 can be used. The cleaning performance of the tableware is sufficient and a high cleaning performance can be obtained.

When the cleaning pump 8 operates in this configuration, the cleaning water pressure is applied to the first cleaning nozzle 11. At this time, the rod-shaped nozzle 9
The propulsive force in the direction of the nozzle tip due to the cleaning water pressure is
The propelling force is set to be larger than the propulsive force in the nozzle axial direction due to the reaction force of the washing water jet from the rod-shaped nozzle 9, and the inner bottom surface of the propelling nozzle 10 is formed on the outer periphery of the rotary seal shaft 13. Abuts on the projection 13a. Further, the propulsion nozzle 10 rotates by the propulsive force of the reaction force of the washing water injection, and the rod-shaped nozzle 9 also rotates at the same time. That is, an annular projection 13a in which the inner bottom surface of the propulsion nozzle 10 is formed on the outer periphery of the rotary seal shaft 13
The washing water is supplied to the rod-shaped nozzle 9 and the propulsion nozzle 10 from the nozzle bearing 12 without leaking, so that there is almost no loss of washing water, and the washing water required for washing with a small washing pump is small. Water power is obtained. Therefore, the size and cost of the pump can be reduced, and at the same time, the noise of the cleaning operation can be reduced by reducing the driving noise of the pump motor and the jetting water of the cleaning water.

Next, reference numeral 25 denotes a substantially cylindrical guide pipe which feeds washing water provided on the rotary seal shaft 13 to the rod-shaped nozzle 9, which is located on the tip side of the branch to the propulsion nozzle 10 and extends in the axial direction, and extends in the axial direction. The cleaning water is supplied to the propulsion nozzle 10 through an opening 31 provided at an intermediate portion.

Looking at the supply line of the washing water in this configuration, only the opening 31 to the propulsion nozzle 10 is provided between the nozzle bearing 12 and the rod-shaped nozzle 9. That is, since the change in the cross-sectional area of the supply pipe is small and the pipe loss of the washing water is small, the rod-shaped nozzle 9 has a pressure substantially equal to the washing water pressure in the nozzle bearing 12.
The washing water is sprayed from. Therefore, the required water power required for cleaning can be obtained with a smaller cleaning pump, and the size and cost of the pump can be reduced. The noise can be further reduced.

Further, a second embodiment of the present invention will be described with reference to FIG. This is because the configuration of the rotary seal shaft of the dishwasher in the first embodiment of the present invention is different, and the same mechanical components as those in the first embodiment are commonly used as the mechanical components of the entire dishwasher. Therefore, the description is omitted.

As shown in FIG. 2, the rotary seal shaft 32 extends a substantially cylindrical guide conduit 33 for feeding the cleaning water to the rod-shaped nozzle 9 to the distal end side from the branch portion to the propulsion nozzle 10 and forms the rod-shaped nozzle 9. The first cleaning nozzle 11 is provided with a smooth cylindrical bearing portion 34 which is formed so as to be inserted, is detachable by screw fitting with the nozzle bearing 12, and supports the first cleaning nozzle 11. Further, cleaning water is supplied to the propulsion nozzle 10 from an opening 35 provided at an intermediate portion. A plurality of ribs 36 are formed on the outer peripheral surface of the guide conduit 33 in the axial direction. Note that the basic operation of the cleaning process is the same as that of the first embodiment, and thus the description is omitted.

When the cleaning pump is operated in this configuration, the leakage loss of the cleaning water and the pipe loss between the first cleaning nozzle 11 and the nozzle bearing 12 due to the configuration of the rotary seal shaft 32 are minute, as in the above embodiment. The same is true. In addition to the above effects, the ribs 36 on the outer peripheral surface of the guide pipe line 33 cause the rod-shaped nozzle 9 to be inserted into the gap although the thickness is small, such as tea leaves and kelp, due to misuse such as forgetting to mount the filter. It is possible to prevent residual vegetables that may stop rotating from entering between the rod-shaped nozzle 9 and the guide conduit 33. At the same time, it is possible to secure a space enough to discharge fine residual vegetables such as sand and foreign matter without accumulating. That is, reliability can be improved in that a predetermined cleaning performance is always obtained without rotation failure of the cleaning nozzle. The same applies to the case where a plurality of ribs 36 are formed not in the outer circumferential surface of the guide pipe 33 but in the axial direction of the inner circumferential surface of the rod-shaped nozzle 9.

Effect of the Invention As described above, the dishwasher of the present invention injects the washing tank, the tableware arranged in multiple stages in the washing tank, and the washing water arranged between the tableware baskets arranged in multiple stages. A washing nozzle, a nozzle bearing that supports one end of the washing nozzle and feeds washing water, wherein the washing nozzle has a propulsion nozzle that branches a washing water path from the axially supported end and an axial direction from a branch portion thereof. A cylindrical nozzle that has an annular projection that is inscribed in the cleaning nozzle and abuts on the inner bottom surface of the propulsion nozzle, and is connected to the nozzle bearing. With a configuration in which a substantially cylindrical guide pipe for feeding water to the double nozzle is formed to extend to the tip side from the branch portion of the propulsion nozzle, first, leakage power from the nozzle bearing is reduced, and Washing The required water power required for cleaning can be obtained by the purification pump, and a pump with low cleaning noise can be provided. In addition, the rotary seal shaft is formed by extending a substantially cylindrical guide pipe for feeding the cleaning water to the rod-shaped nozzle to the tip side from the branch portion of the propulsion nozzle, thereby reducing a pipe loss at the nozzle bearing. As a result, higher cleaning performance can be obtained with a small cleaning pump.

Further, in addition to the above configuration, the dishwasher of the present invention has a configuration in which a plurality of ribs are formed in the axial direction between the guide pipe and the rod-shaped nozzle, thereby reducing leakage loss from the nozzle bearing and pipe loss. At the same time, it is possible to obtain a cleaning nozzle free from rotation failure due to accumulation of garbage and foreign substances, and to provide a small cleaning pump having high cleaning performance, low cleaning noise and high reliability.

[Brief description of the drawings]

1 is a sectional view of a dishwasher according to a first embodiment of the present invention, FIG. 2 is a perspective view of a rotary seal shaft of the dishwasher according to a second embodiment, and FIG. 3 is a conventional dishwasher. FIG. 4 is a sectional view of a main part of the cleaning nozzle. 9 ... rod-shaped nozzle, 10 ... propulsion nozzle, 12 ... nozzle bearing, 13, 32 ... rotary seal shaft, 19, 20 ... tableware basket, 21
... arm nozzle, 25 ... guide line, 36 ... rib.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Miyauchi 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-50-66060 (JP, A) 12865 (JP, A) Jiko 44-21889 (JP, Y1)

Claims (2)

(57) [Claims] 1. A washing tank, a tableware basket arranged in multiple stages in the washing tank, a washing nozzle for jetting washing water arranged between the tableware baskets arranged in multiple stages, and one end of the washing nozzle. A nozzle bearing that supports the shaft and feeds washing water,
The cleaning nozzle is composed of a propulsion nozzle that branches a cleaning water path from one end supported by a shaft, and a rod-shaped nozzle that extends in the axial direction from the branch portion. The cleaning nozzle is inscribed in the cleaning nozzle and contacts the inner bottom surface of the propulsion nozzle. The rotary seal shaft is connected to the nozzle bearing by a cylindrical rotary seal shaft having an annular projection that comes into contact with the rotary seal shaft. Dishwasher formed by extension. 2. The dishwasher according to claim 1, wherein a plurality of ribs are formed in an axial direction at an inscribed portion between the guide pipe and the washing nozzle.