JP2009089941A - Dishwasher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a professional-use dishwasher having a high functionality and a simple structure and capable of greatly reducing the manufacturing cost and the operation cost compared with those of the conventional one. <P>SOLUTION: This dishwasher is provided with a dish washing chamber 10 disposed with a washing nozzle 2 and a rinse nozzle 3 in its inside, a wash solution tank 4 and a rinse water tank 5, a wash solution pump P1 for pumping the wash solution W1 in the wash solution tank 4 to the washing nozzle 2, and a rinse water pump P2 pumping the rinse water W2 in the rinse water tank 5 to the rinse nozzle 3, wherein the rinse water tank 5 having an electric heater H and the wash solution tank 4 having no heating means are adjacently disposed via a metal partition wall 6, so that the temperature of the wash solution W1 in the wash solution tank 4 is raised by heat transfer from the heated rinse water W2 in the rinse water tank 5 via the metal partition wall 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a dishwasher used for automatic cleaning of used tableware, particularly in a commercial kitchen such as a hotel, restaurant, employee cafeteria, or hospital lunchroom.

  As a tableware washing machine for business use, as shown in the schematic diagram of FIG. 5, a washing nozzle 22 and a rinsing nozzle 23 are arranged above and below the tableware washing room 21 provided on the upper side in the vertically long box 20, A washing liquid tank 24 and a rinsing water tank 25 are arranged on the lower side of the box 21, and a bowl-shaped washing rack R containing the dishes T to be washed is accommodated in the dish washing room 21. The cleaning liquid W1 in the cleaning liquid tank 24 is pressure-fed to the cleaning nozzles 22 and 22 by the cleaning liquid pump P1, and the dishes T ... are cleaned by the cleaning liquid W1 sprayed from above and below, and then the rinsing water in the rinsing water tank 25 by the rinsing water pump P2. W2 is pressure-fed to the rinsing nozzles 23, 23, and the washing liquid W1 adhering to the dishes T ... after washing is washed away by rinsing water W2 sprayed from above and below. The cleaning nozzle 22 and the rinsing nozzle 23 are generally provided in the form of a bar or a trident in the horizontal direction and are provided with injection ports at regular intervals. During operation, the cleaning liquid W1 and the rinsing nozzle 23 are swung around the central portion. Rinsing water W2 is injected. Further, in the normal specification, the cleaning liquid W1 that is used for cleaning and flows down is returned to the cleaning liquid tank 24 and is repeatedly used until the cleaning power is reduced to some extent, and the used rinsing water W2 also flows into the cleaning liquid tank 24, The increase due to the inflow overflows from the cleaning liquid tank 24 and is discharged to the outside.

  As the cleaning liquid W1 in the cleaning liquid tank 24, an alkaline detergent aqueous solution is generally used. In order to increase the cleaning power, the cleaning liquid W1 is usually heated to about 60 to 65 ° C. by a built-in heater H1. The rinsing water W2 in the rinsing water tank 25 is made of tap water, but is usually heated to a high temperature of about 80 to 90 ° C. by the built-in heater H2 in order to impart sterilizing power. The cleaning liquid tank 24 and the rinsing water tank 25 are provided with a thermometer 26 for measuring the liquid temperature (water temperature) and level sensors 27a and 27b for setting the upper and lower limits of the liquid level (water surface). The lower limit setting level sensor 27b is disposed above the heaters H1 and H2 in order to prevent the heaters H1 and H2 from flying.

  However, this type of dishwasher is required to be more functional when installed in a narrow kitchen, and further reduction in manufacturing cost and operation cost is required.

  In view of the above-mentioned situation, the present invention is very functional and structurally simple as this type of dishwasher, and can greatly reduce the manufacturing cost and the operating cost as compared with the conventional one. It is intended to provide.

  If the means for achieving the above object is shown with reference numerals in the drawings, the dishwasher according to claim 1 of the present invention includes a dishwashing chamber 10 in which the washing nozzle 2 and the rinsing nozzle 3 are arranged. The cleaning liquid tank 4 and the rinsing water tank 5, the cleaning liquid pump P1 for pumping the cleaning liquid W1 in the cleaning liquid tank 4 to the cleaning nozzle 2, and the rinsing water pump P2 for pumping the rinsing water W2 in the rinsing water tank 5 to the rinsing nozzle 3 The rinsing water tank 5 having heating means (electric heater H) and the cleaning liquid tank 4 not having heating means are arranged adjacent to each other via a metal partition wall 6 so that the rinsing water tank 5 The rinsing water W1 in the cleaning liquid tank 1 is heated by the heating means, and the cleaning liquid W1 in the cleaning liquid tank 4 is heated by heat transfer from the heated rinsing water W2 through the metal partition wall 6. It is characterized in Rukoto.

  According to a second aspect of the present invention, in the dishwasher of the first aspect, the metal partition wall 6 is made of a stainless steel plate having a thickness of 0.8 to 2 mm.

  The invention of claim 3 is the tableware washing machine according to claim 1 or 2, wherein the dishwashing chamber 10 is provided on the upper side of the vertically long box 1, and the washing liquid tank 4 and the rinsing water tank 5 are accommodated on the lower side. The cleaning liquid W1 and the rinsing water W2 sprayed and dropped from the cleaning nozzle 2 and the rinsing nozzle 3 are configured to flow into the cleaning liquid tank 4, and the capacity of the cleaning liquid tank 4 is 1. It is assumed that it is set to 2 to 2 times.

  Next, effects of the present invention will be described with reference numerals in the drawings. First, in the dishwasher according to the first aspect of the present invention, the heat of the rinsing water W2 in the rinsing water tank 5 heated by the heating means is transmitted to the cleaning liquid W1 in the cleaning liquid tank 4 through the metal partition wall 6, and thus the cleaning liquid. Since W1 can be heated and high cleaning power can be secured, the thermal energy efficiency can be increased and the operating cost can be reduced. In addition to the fact that no heating means is required on the side of the cleaning liquid tank 4, a thermometer and a liquid volume lower limit are set. Therefore, the equipment cost can be reduced by that amount, and there is no dead space between the cleaning liquid tank 4 and the rinsing water tank 5, and an apparatus configuration excellent in space efficiency and functionality can be realized.

  According to the invention of claim 2, since the metal partition wall 6 is made of a stainless steel plate, there is no concern that the cleaning liquid W1 is attacked by an aqueous solution of a general alkaline detergent or a neutral detergent, and the thickness of the stainless steel plate is moderate. Therefore, sufficient thermal conductivity can be obtained while ensuring the strength as the partition wall 6.

  According to the invention of claim 3, in the structure in which the entire dishwasher is functionally organized as a vertically long box type, and the cleaning liquid W1 and the rinsing water W2 sprayed into the dishwashing chamber 10 enter the cleaning liquid tank 4, the cleaning liquid Since the volume ratio between the tank 4 and the rinsing water tank 5 is in a specific range, the cleaning liquid W1 in the cleaning liquid tank 4 can be easily maintained in an appropriate temperature range.

  Hereinafter, embodiments of a dishwasher according to the present invention will be specifically described with reference to the drawings. 1 is a partially broken front view of a fully open door type dishwasher to which the present invention is applied, FIG. 2 is a partially broken side view of the dishwasher, and FIG. 3 is a cross-sectional arrow along the line ZZ in FIG. FIG. 4 is a schematic view showing the operating principle of the dishwasher.

  As shown in FIGS. 1 to 3, in the dishwasher, the upper side of the vertically long box 1 constitutes a dishwashing chamber 10, and a washing nozzle 2 and a rinsing nozzle 3 are respectively disposed above and below the tableware washing chamber 10. And a cleaning liquid tank 4 and a rinsing water tank 5, a cleaning liquid pump P1 and a rinsing water pump P2 are installed on the lower side of the box 1, and an outer shell portion excluding the back side of the dishwashing chamber 10 is provided. A fully open door 11 having a viewing window 11a on the front surface is formed. The door 11 is lifted upward as shown by an imaginary line in FIG. 2 by pulling up a U-shaped operation lever 12 arranged so as to surround from the front side to the left and right sides. It is designed to be opened.

  The washing nozzle 2 is formed in a flat hollow strip shape, and the rinsing nozzle 3 is formed in a pipe shape, both of which are downwardly spaced above the dishwashing chamber 10 at predetermined intervals in the longitudinal direction and upwardly facing a plurality of upwardly directed jets (not shown). )have. Each pair of the upper and lower cleaning nozzles 2 and rinsing nozzles 3 is pivotally supported as a rotary nozzle so as to be coaxially pivotable in the longitudinal central portion, and the cleaning liquid W1 and the rinsing water tank 5 in the cleaning liquid tank 4 are passed through the axial support. The rinsing water W2 is supplied.

  The cleaning liquid tank 4 and the rinsing water tank 5 are integrally configured in such a manner that the inside of a stainless steel tank body 13 is divided forward and backward by a stainless steel partition wall 6. And the capacity | capacitance of both the tanks 4 and 5 is large set with the washing | cleaning-liquid tank 4 side about 1.2 to 2 times the rinsing water tank 5 side so that the latter may be 27 liters with respect to the former 45 liters. . The upper side of the rinsing water tank 5 is closed by the cover plate 5a, but the upper side of the cleaning liquid tank 4 is fully open. On the other hand, the upper part of the installation space 14 of the cleaning liquid pump P1 and the rinsing water pump P2 is blocked by a bottom plate 15 having a downward slope toward the cleaning liquid tank 4 side of the tableware cleaning chamber 10.

  In the rinsing water tank 5, an electric heater H located on the bottom side, a thermometer 16 located in the middle, and level sensors 17a and 17b for setting the upper and lower limits of the liquid level are installed. A lead-out port 50 to the rinsing water pump P2 is located between the sensor 17b and the sensor 17b. On the other hand, in the cleaning liquid tank 4, a level sensor 17c for setting the upper limit of the water surface is installed, and a strainer 18 is attached to the outlet 40 to the rinsing water pump P1 located on the bottom side. Although not shown, a water supply pipe from the outside is drawn into the installation space 14 of the pumps P1 and P2, and tap water enters the rinsing water tank 5 from the water supply pipe via an electromagnetic on-off valve. It has been introduced.

  In order to wash dishes with the dishwasher having the above-described configuration, the rinsing water W2 in the rinsing water tank 5 is previously set to a high temperature of 75 to 95 ° C, preferably about 80 to 90 ° C by heating with the electric heater H. At the same time, the cleaning liquid W1 in the cleaning liquid tank 4 is kept in a constant heating state by heat transfer through the partition wall 6 from the rinsing water tank 5 side. The heating state of the cleaning liquid W1 is not particularly adjusted by setting the capacity ratio of the tanks 4 and 5 to the heat balance between the heat transfer through the partition wall 6 and the heat dissipation on the cleaning liquid tank 4 side. It is stabilized in the range of 50 to 70 ° C, usually about 60 to 65 ° C. The reason why the rinsing water W2 is set to a high temperature as described above is to exhibit a sterilization effect due to the high temperature simultaneously with the rinsing. On the other hand, the temperature of the cleaning liquid W1 is slightly lowered because the higher the temperature is, the higher the cleaning power is. On the other hand, in the case where a component that hardens at high temperature such as a raw egg is contained in the dirt attached to the tableware, the high temperature This is to prevent the solidified material from sticking to the walls of the dishes and the washing machine and making it difficult to remove dirt.

  In the washing operation, as shown in FIG. 4, first, after storing the bowl-shaped washing rack R containing the dishes T ... to be washed in the dish washing room 10, the washing liquid pump P1 is operated, The cleaning liquid W1 in the cleaning liquid tank 4 is pumped from the cleaning liquid pipe L1 to the upper and lower cleaning nozzles 2 and 2 through the upper and lower branch pipes L1u and L1d, and the tableware T. Cleaning is performed with the cleaning liquid W1. Next, by operating the rinsing water pump P2, the rinsing water W2 in the rinsing water tank 5 is pumped from the rinsing water pipe L2 to the upper and lower rinsing nozzles 3 and 3 through the upper and lower branch pipes L2u and L2d. The washing liquid W1 adhering to the tableware T... Is swirled by the rinsing water W2 sprayed from above and below while turning 3 and 3.

  In the above-described cleaning process, the cleaning liquid W1 discharged from the cleaning nozzles 2 and 2 is directly dropped and flows down and returns to the cleaning liquid tank 4 that is open upward, and is supplied in a circulating manner and has a certain level of cleaning power. Used repeatedly until it drops. The food residue flows into the cleaning liquid tank 4 along with the returning cleaning liquid W1, but is not mixed into the cleaning liquid W1 derived from the outlet 40 by being filtered by the strainer 18. Further, in the rinsing process, the rinsing water W2 discharged from the rinsing nozzles 3 and 3 flows into the cleaning liquid tank 4, and an increase due to the inflow overflows from the cleaning liquid tank 4 and passes through a drainage passage (not shown) to the outside. Discharged. Thus, in a normal cleaning operation, the discharge of the cleaning liquid W1 per one time is about 350 to 400 liters in about 1 minute, whereas the same discharge of the rinsing liquid W2 is about 3 to 5 liters in about 10 seconds. Since the temperature lowering effect due to the reflux of the cleaning liquid W1 whose temperature is slightly lowered by contact with the tableware T ... is moderately balanced with the temperature rising effect due to the inflow of the high temperature rinsing liquid W2, the following tableware T The temperature of the cleaning liquid W1 in the cleaning liquid tank 4 does not fluctuate greatly even if the cleaning operation is repeated without stopping until.

  According to such a dishwasher, heating means such as an electric heater is not provided on the cleaning liquid tank 4 side, and the cleaning liquid W2 inside the cleaning liquid tank 2 is heated to increase the temperature by heat transfer from the rinsing water tank 5 side to ensure high cleaning power. Therefore, it is possible to increase the thermal energy efficiency and reduce the operation cost. Moreover, on the cleaning liquid tank 4 side, in addition to the fact that there is no need for heating means and a thermometer, there is no concern about emptying, so the level sensor for setting the lower limit of the liquid amount to prevent emptying can be omitted, and the equipment cost is accordingly increased. Can be reduced. Moreover, in this dishwasher, since no dead space is generated between the cleaning liquid tank 4 and the rinsing water tank 5, high space efficiency is obtained, and the apparatus configuration is simple and excellent in functionality.

  In general, an aqueous solution of an alkaline detergent or a neutral detergent is used as the cleaning liquid W1, but since the partition wall 6 is made of stainless steel, there is no concern of being affected by the aqueous detergent solution. On the other hand, when aluminum, copper, or an alloy thereof is used for the partition wall 6, the thermal conductivity is better than that of stainless steel, but the problem of corrosion due to the alkaline detergent solution occurs. Thus, the thickness of the partition wall 6 made of stainless steel is in the range of 0.8 to 2 mm, particularly preferably 1.0 to 1.5 mm, in order to ensure the strength as the partition wall and obtain sufficient thermal conductivity. It is better to set it to a degree. On the other hand, as the rinsing water W2, tap water can be used as described above.

  Although the dishwasher of the said embodiment is a full open door type, this invention is applicable similarly to the dishwasher from which the opening-and-closing system of the dishwashing room 10 differs. The heating means on the rinsing tank 5 side is not limited to the illustrated electric heater H, heating by superheated steam or superheated air introduced from the outside, direct heating, oil bath, or gas hot water installed outside Various systems such as a water heater and an electric water heater can be adopted. In the embodiment, the upper side of the cleaning liquid tank 4 is completely open. However, a strainer plate, a perforated plate, a net plate, or the like may be covered as a strainer for preventing a drop of coarse food residue or the like. In addition to the embodiment, various design changes can be made to the detailed configuration such as the configuration of the cleaning nozzle 2 and the rinsing nozzle 3, the configuration of the cleaning solution tank 4 and the rinsing tank 5, the configuration of the cleaning solution pump P1 and the rinsing pump P2, and the piping configuration. is there.

The partially broken front view of the dishwasher which concerns on one Embodiment of this invention. The partially broken side view of the tableware washing machine. FIG. 3 is a cross-sectional view taken along the line ZZ in FIG. 2. The schematic diagram which shows the operation | movement principle of the same dishwasher. The schematic diagram which shows the operation | movement principle of the tableware washing machine of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Box 2 Washing nozzle 3 Rinse nozzle 4 Washing liquid tank 5 Rinsing water tank 6 Bulkhead 10 Dishwashing room H Electric heater (heating means)
P1 cleaning liquid pump P2 rinsing water pump W1 cleaning liquid W2 rinsing water

Claims (3)

Tableware washing room with washing nozzle and rinsing nozzle inside, washing liquid tank and rinsing water tank, washing liquid pump for pumping washing liquid in washing liquid tank to washing nozzle, and rinsing water in rinsing water tank are pumped to rinsing nozzle A dishwasher equipped with a rinsing water pump
The rinsing water tank having a heating means and the cleaning liquid tank not having a heating means are disposed adjacent to each other via a metal partition wall,
The rinsing water in the rinsing water tank is heated by the heating means, and the cleaning liquid in the cleaning liquid tank is heated by heat transfer from the heated rinsing water through the metal partition wall. A dishwasher characterized by   The dishwasher according to claim 1, wherein the metal partition wall is made of a stainless steel plate having a thickness of 0.8 to 2 mm.   The upper part of the vertically long box has the dish washing room, and the lower part is housed with the washing liquid tank and the rinsing water tank, and the washing liquid and the rinsing water sprayed from the washing nozzle and the rinsing nozzle are dropped into the washing liquid tank. The dishwasher according to claim 1 or 2, wherein the washing liquid tank has a capacity of 1.2 to 2 times the capacity of the rinsing water tank.

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