JP2000237115A - Tableware washer/drier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To particularly efficiently heat hot air, and to reduce size and weight by constituting a hot air heating passage in a U shape via a partition pleat arranged in the center on a heater block surface, and arranging plural heat radiating fins in the main flow direction of hot air in a forward passage and a backward passage, respectively. SOLUTION: A heater block 50 of the tableware washer/drier is integrally constituted of a pipe 13 of a hot water heating passage, a hot air heating passage and a heater 12, and hot water and hot air 53 are heated by the heater 12 via heat conduction in a heater block 50. The hot air heating passage is constituted in a U shape by arranging a partition plate 55 in a central part on a heater block surface, and the heater block surface is divided into a forward passage 51a and a backward passage 51b to thereby constitute the hot air heating passage so that the hot air 53 entering from a hot air inlet 56 arranged on one end of the heater block 50 passes through the forward passage 51a, turns back at a merging point 57, and passes through the backward passage 51b to come out of a hot air outlet 58. Plural heat radiating fins 60a to 60f are arranged in a lengthwise straight line shape along a main flow of the hot air 53.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher and dryer using hot water (wash water and rinse water) and hot air.

[0002]

2. Description of the Related Art As a prior art, as disclosed in Japanese Patent Application Laid-Open No. Hei 10-127559, a hot water pipe and a heat transfer material covering the periphery thereof are provided in the middle of a hot water circulation path, and the heat transfer material is integrated with a heater. There is a contact configuration.

[0003]

SUMMARY OF THE INVENTION The above prior art is disclosed in
Japanese Patent Application Laid-Open No. 10-127559 describes in detail a method for fixing a heat transfer body and a pipe in contact with each other, and provides efficient heating of hot water.However, although hot air heating by a heater is sufficiently considered, Absent.

[0004] An object of the present invention is to obtain an efficient method of heating hot air by the heat transfer body (corresponding to a heater block of the present invention described later). Is to provide a hot-air heating flow path that flows evenly. Such considerations on the air side generally address that heat transfer from the heater to a liquid such as water is very good, but heat transfer from the heater to a gas such as air is very poor. This is an important issue.

[0005]

In order to achieve the above object, a washing tank for accommodating tableware, a hot water circulation system for supplying hot water to the washing tank, and a hot air circulation for supplying hot air to the washing tank. In a dishwasher / dryer comprising a system and a heater for supplying the hot water and hot air, a hot water heating channel, a hot air heating channel, and a heater are integrally formed in a piping system in which the hot water circulates. In a dishwasher in which a heater block is provided and hot water and hot air are respectively heated by heaters through heat conduction of the heater block, the hot air heating channel is provided through a partition plate provided at the center on the heater block surface. A plurality of radiating fins are formed in a U-shape and provided on the outward path and the return path, respectively, along the main flow direction of the warm air. Here, the height of each of the radiation fins and the partition plate rising from the heater block surface was the same or substantially the same.

The radiating fins on the return path provided after the U-turn have such a length that the fins protrude from the inside toward the outside at the inflow portion of the warm air. further,
The warm air flowing in and / or out of the inflow port and / or outflow port provided in the hot air heating flow path is obliquely inflowing into and / or out of the radiation fins provided along the main flow direction. In this case, the heat radiation fin was configured such that the fin length protruded from the outside to the inside at the inflow port and / or the outflow port.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A dishwasher according to one embodiment of the present invention will be described below. Here, the dishwasher / dryer targeted by the present invention may be a so-called “home tableware-type dishwasher / dryer” placed on a home system kitchen or the like, or a so-called “household kitchen / dryer” embedded in the system kitchen or the like. A “built-in dishwasher / dryer” may be used, or a larger “business-use dishwasher / dryer” may be used.

First, FIG. 6 is a longitudinal sectional view of a built-in dishwasher 1 according to the present invention, which has a box-shaped outer frame 2 in which a washing tank 3 is disposed. 4 is a door. A step portion 3a is provided at a lower portion of the side wall of the washing tank 3, and a lower basket 5 for storing tableware is detachably disposed on the step portion 3a. A front and rear movable rail 6 is attached to the upper part of the side wall of the washing tank 3, and the dish storage upper basket 7 is fitted into the rail 6 so that the table storage upper basket 7 can be freely taken in and out. it can.

A water supply pump 8 is arranged below the washing tank 3, and the water supply pump 8 has a motor 9. A lower arm nozzle 10 that rotates about a central portion is disposed below the tableware storing lower basket 5, and a plurality of small holes 10 a is provided on an upper surface of the lower arm nozzle 10. A Venturi tube 11 b that sends the washing water supplied by the water supply pump 8 to the upper arm nozzle 11 is disposed in the tableware storing lower basket 5. In addition, upper basket 7 for storing tableware
An upper arm nozzle 11 that rotates about a central portion is disposed at a lower portion of the upper arm nozzle 11, and a plurality of small holes 11 a are also provided on the upper surface of the upper arm nozzle 11.

An exhaust duct 15 is arranged below the washing tank 3, and the exhaust duct 15 is connected to an exhaust port 16. A control panel 17 is arranged above the door 4, and a water supply solenoid valve 14 is arranged behind the washing tank 3. Below the cleaning tank 3, besides the water supply pump 8,
A drain pump 18 is arranged.

A hot water circulation duct 24 for hot water (washing water, rinsing water, etc.) is connected to a water reservoir 21 arranged at the bottom of the washing tank 3, and a pipe serving as a hot water heating channel is connected to the hot water circulation duct 24. 13, and a hot water circulation duct 19 is further connected. Here, the pipe 13 is formed integrally with the heater 12 to constitute a heater block 50. On one surface of the heater block 50, a hot air heating channel 51 is formed.

As described above, when the heater block 50 is provided in the middle of the piping system of the hot water circulation, the following conventional problems can be solved. That is, when the heater 12 is exposed at the bottom of the washing tank 3, it is possible to prevent thermal deformation and scorching due to heater contact when resin tableware and cooking utensils fall from the basket, and burns due to heater tentacles.

Here, the washing, rinsing and drying steps of the dishwasher 1 having the above configuration will be described. First,
In the cleaning process, the water supply solenoid valve 14 is energized to supply cleaning water to the cleaning tank 3, and the heater 12 is energized to energize the pump motor 9, and the cleaning runner 20 is rotated to supply water from the water reservoir 21. Is drawn into the pipe 13 through the hot water circulation duct 24, and heated by the heater 12 through the heater block 50 in the pipe 13.

The heated washing water (hot water) is supplied into the upper arm nozzle 11 through the hot water circulation duct 19, the water supply pump 19, the pump discharge port 22, the lower arm nozzle 10, and the venturi pipe 11b. And the lower arm nozzle 1
High-pressure washing water is directly sprayed from the 0 and upper arm nozzles 11 onto the tableware on the tableware storage basket to separate and disperse the dirt attached to the tableware. After cleaning for a certain period of time, the power supply to the motor 9 and the heater 12 is stopped to terminate the cleaning process, and the power is supplied to the drain pump 18 to discharge the cleaning water in the cleaning tank 3 to the outside of the machine.

In the next rinsing step, the same operation as in the cleaning step is repeated several times. At this time, the power supply to the heater 12 is performed only during the rinsing step with warm water.

In the last drying step, although not shown, the air supply unit is energized to rotate the air supply fan, and the air supply duct disposed below the washing tank 3 and the heater block 50 having the hot air heating flow path 51 are turned on. The hot air is blown into the washing tank 3 via the cleaning tank 3. In this case, the warm air flowing through the warm air heating flow path 51 is heated by the heater 12 via the heater block 50. The hot air converts water droplets and residual water adhering to the washing tank 3 and tableware into steam, and is exhausted to the outside through the exhaust duct 15 and the exhaust port 16. When the drying process has been performed for a certain period of time, the series of operations of the dishwasher is ended.

Next, some detailed structural examples of the above-described heater block 50 of the present invention will be described.

FIG. 1 is a plan view of a heater block 50 of the present invention, and FIG. 2 is a cross-sectional view taken along a line AB (a cross section perpendicular to the flow of warm air). As described above, the heater block 50
The pipe 13 which is a heating flow path of the hot water 52, the hot air heating flow path 51, and the heater 12 are integrally formed, and the heating of the hot water 52 and the hot air 53 is performed by the heater 12 through heat conduction in the heater block 50. Done. Pipe 13 for heating the hot water
Is configured to penetrate the center of the heater block 50.

Here, for example, the heater block 50
The material forming the hot air heating flow path 51 may be an aluminum casting (aluminum die-cast), the material of the pipe 13 may be a metal pipe such as copper, and the heater 12 may be formed of a sheathed heater, a cartridge heater, or the like. Of course, other materials may be used. In addition, the heater 12 and the pipe 13 may be integrated by casting from the beginning into an aluminum casting as the heater block 50, or may be brazed and swaged to the heater block 50, or may be bonded with an adhesive and a filler. It may be integrated by joining. However, it is important to use a material having good thermal conductivity for the adhesive and the filler, and to tightly fix them so that an air layer is not formed.

Reference numeral 54 denotes a channel cover for the hot air heating channel.
Reference numeral 55 denotes a partition plate, which is provided at a central portion on the heater block surface 50a to configure the hot air heating flow path 51 in a U-shape.
The heater block surface 50a is divided into a forward path 51a and a return path 51b. Thereby, the warm air 53 entering from the warm air inlet 56 provided at one end of the heater block 50
a, return at the junction 57, pass through the return path 51 b, and exit through the hot air outlet 58.
1.

Reference numeral 60 denotes a plurality of (three in the figure, three on both the forward and return) radiating fins which are long and linearly provided along the main flow direction of the warm air 53.
a, and the height of each radiating fin 60 is the same as the height of the partition plate 55 provided at the center as shown in FIG.

This is because the flow is branched into a plurality of small flow paths by the plurality of radiating fins 60, and in the U-shaped hot air heating flow path 51, the hot air 53 flows more easily toward the outer side. When the height of the radiating fins 60 is lower than the height of the partition plate 55, the hot air 53 freely crosses in the direction in which the hot fins 60 can easily flow on the radiating fins 60. As a result, the flow rate of the hot air increases toward the outside and the flow rate distribution is generated. Because it is easy. here,
The number of the radiation fins 60 need not be limited to this.

In the embodiment shown in FIG. 1, in the radiating fins 60d to 60f of the return path 51b provided after the U-turn, the length of the radiating fin 60 in the main flow direction goes from the inside to the outside at the inflow portion of the return path 51b. It protrudes sequentially long. That is, the protrusion length of the inflow portion of the radiation fin 60 is 6
0d <60e <60f.

In the embodiment shown in FIG. 1, the warm air 53 flowing from the inlet 56 flows obliquely (in the figure, at an intersection angle θ61) with respect to the radiation fins 60 provided along the main flow direction. Radiation fins 6
The length of 0 protrudes sequentially from the outside to the inside at the inflow portion. That is, the projecting length of the inflow portion of the radiation fins 60 satisfies 60a <60b <60c.

By doing so, the plurality of heat radiation fins 6
Thus, the flow rate of the hot air in each portion of the heater block surface 50a composed of 0 is equalized to the whole without being deviated to the outside, and the efficient hot air heating flow path 51 can be provided.

On the other hand, in the embodiment of FIG. 3, contrary to FIG.
The warm air 53 flowing out from the outlet 58 flows obliquely to the radiating fins 60 provided along the main flow direction (in the figure, at an intersection angle θ61). The length protrudes from the outside toward the inside in the outflow portion. That is, the protrusion length of the outflow portion of the radiation fin 60 is 60f <60e <.
60d.

In the above configuration, for example, in FIG. 3, when the flow path near the radiation fins 60a outside the outward path is still easier to flow the hot air 53 than the flow path near the radiation fins 60c inside, as shown in FIG. You may comprise.

In the embodiment shown in FIG. 4, the outer radiating fins 60a through which the hot air 53 flows easily have a longer overall length in the main flow direction than the inner radiating fins 60c, and the passage resistance (flow path friction resistance) is larger. It is configured to be. For this reason, the passage resistance increases toward the outside, and the warm air 53 easily flows evenly. Although not shown, the warm air 5
As a method for increasing the passage resistance of No. 3, the pitch between the outer radiating fins at which the warm air 53 easily flows (represented by P in the figure)
May be narrower than the pitch of the inner radiation fins.

FIG. 5 shows another embodiment of the present invention, which is a countermeasure example in a case where the hot air 53 flows more easily in the outer flow path than in the inner flow path. The resistance projection 62 is provided on the outer peripheral portion of the center of 57. The resistance protrusion 62 forcibly bends the warm air 53 flowing through the outer periphery of the outward path 51a to the inside, thereby increasing the passage resistance of the outer periphery and increasing the warm air 53 to the vicinity of the inner radiation fin 60d of the return path 51b. Becomes easier to flow. In the merging portion 57, a plurality of small protrusion groups, for example, pin fins, may be provided on the heater block surface 50a instead of the resistance protrusions 62. In this case, the plurality of protrusion groups leads to an increase in the surface area that contributes to heat transfer.

In the above configuration, the radiation fin 6
Since the surface area of 0, that is, the surface area for heating the hot air, is more efficiently transmitted as the width is larger, if the size of the heater block surface 50a is determined, a large number of thin and high radiating fins 60 are provided. Better. However, it goes without saying that the design is made so that the passage resistance does not increase in consideration of the characteristics of the blower fan. The heater block 50
Is an aluminum casting (die-cast), the thickness of the heat radiation fins 60 will be, for example, about 2 to 3 mm because the thickness cannot be extremely thin in manufacturing. In this case, the height of the heat radiation fins 60 is desired to be, for example, 20 mm or less in consideration of the fin efficiency and the like. However, in the embodiment of the present invention, it is not always necessary to limit to the above dimensions.

Further, a catalyst which exhibits a deodorizing ability (adsorption or decomposition of odor) is supported on the heater block 50 which is relatively high in temperature, or a catalyst device is attached, for example.
A function of deodorizing the circulating warm air 53 may be added.

[0032]

According to the present invention, in a heater block in which a hot water heating channel, a hot air heating channel, and a heater are integrally formed, the length of a radiation fin constituting the hot air heating channel is adjusted. In this case, the flow of the hot air is made uniform and the surface area is increased by the radiating fins. Therefore, the heating of the hot air is particularly efficiently performed, and a compact and lightweight dishwasher can be provided.

[Brief description of the drawings]

FIG. 1 is a plan view of a heater block according to the present invention in which an inflow port is inclined.

FIG. 2 is a cross-sectional view taken along a line AB in FIG.

FIG. 3 is a plan view of a heater block having an inclined outlet.

FIG. 4 is a plan view of a heater block in which the length of a radiation fin is controlled.

FIG. 5 is a plan view of a heater block having a protrusion on an outer peripheral portion.

FIG. 6 is a vertical cross-sectional view of the dishwasher.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Dishwasher / dryer, 2 ... Outer frame, 3 ... Wash tank, 4 ... Door, 5 ... Lower basket for storing dishes, 6 ... Rail, 7 ... Upper basket for storing dishes, 8 ... Water supply pump, 9 ... Motor, 10 ... lower arm nozzle, 11 ... upper arm nozzle, 12 ... heater, 13
... pipe, 14 ... water supply solenoid valve, 15 ... exhaust duct, 16
... exhaust port, 17 ... control panel, 18 ... drain pump, 19 ... washing water circulation duct, 20 ... washing runner,
DESCRIPTION OF SYMBOLS 21 ... Reservoir part, 22 ... Pump discharge port, 24 ... Cleaning water circulation duct, 50 ... Heater block, 51 ... Hot air heating flow path, 52 ... Hot water, 53 ... Hot air, 54 ... Flow path cover, 55
.., A partition plate, 56... An inlet, 57... A merging section, 58. An outlet, 60.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Mitsuhiro Sato 1-1-1, Higashitaga-cho, Hitachi City, Ibaraki Prefecture F-term (reference) 3B082 BD01 BE00 BK04 JA03

Claims (4)

[Claims] 1. A heater block in which a hot water heating channel, a hot air heating channel, and a heater are integrally provided in a piping system through which hot water circulates, and the heater block is connected to the hot water through heat conduction of the heater block. In a dishwasher in which winds are heated by heaters, the hot-air heating flow path is formed in a U-shape through a partition plate provided at the center on the heater block surface, and hot air flows in the outward path and the return path, respectively. A dishwasher and dryer having a plurality of radiating fins along a mainstream direction. 2. The dishwasher / dryer according to claim 1, wherein the height of each of the radiation fins and the partition plate rising from the surface of the heater block is the same. 3. The radiating fin of the return path provided after the U-turn has a fin length that sequentially protrudes from the inner side to the outer side at the inflow section of the warm air. 3. The dishwasher / dryer according to 2. 4. A hot air flowing in and / or out of an inlet and / or outlet of hot air provided in the hot air heating flow path is inclined with respect to a radiation fin provided along a main flow direction. The inflow and / or outflow configuration, wherein the fin lengths of the heat radiation fins sequentially protrude from the outside to the inside at the inlet and / or the outlet. Item 4. The dishwasher / dryer according to any one of items 3 to 10.