JPS6037101Y2 - dishwasher - Google Patents

Description

[Detailed description of the invention] The invention relates to a dishwasher, and more specifically, the cleaning liquid is passed through a pipe body under the discharge pressure of a cleaning pump, and the cleaning liquid is heated by a heater arranged on the circumferential wall of the pipe body. This invention relates to an improvement in a heating structure for improving cleaning performance, which prevents foreign matter from adhering to the inner circumferential wall of the pipe body,
The present invention provides a configuration that improves heat exchange efficiency, prevents abnormal temperature rise of the heater, and prevents the discharge pressure of the cleaning pump from decreasing.

In a conventional heating device for a dishwasher, the ends of a pipe body made of a heat-resistant material are connected to hoses through which cleaning liquid flows, and a heater is wound and fixed around the outer circumferential surface of the pipe body.

The inner diameter of the pipe body is approximately equal to or slightly larger than the inner diameter of the hose.

Here, the heat from the heater is to heat the cleaning liquid passing through the pipe body, but the cleaning liquid contains all kinds of leftovers, and in particular proteins such as eggs can burn onto the inner wall of the pipe body. It was easy to stick and adhere.

In addition, the tap water used as the cleaning liquid contains components such as calcium and magnesium, which tend to adhere to and accumulate on the inner wall of the pipe body after long-term use.

The cause of such adhesion and accumulation of foreign matter is that the flow rate of the cleaning liquid along the inner wall is relatively slow.

When the above-mentioned foreign matter adheres and accumulates, heat transfer from the pipe body to the cleaning liquid is inhibited by the foreign matter1, resulting in a decrease in heat exchange efficiency and a longer time required for the liquid temperature to rise. Heat dissipation from the pipe body becomes difficult, resulting in an abnormal temperature rise in the heater, which may result in a very dangerous situation.

The present invention has been developed in view of the above-mentioned drawbacks of the conventional art, and examples thereof will be described below.

In the figure, 1 is the main body of the dishwasher, 2 is a tank installed inside the main body 1, and 3 is a washing pump that circulates the washing water in the tank 2, which is rotationally driven by a pump motor 4.

5 is a first circulation path consisting of a hose or the like that communicates with the discharge side of the cleaning pump 3; 6 is a heating device installed in the middle of this first circulation path 5; and 7 is a first circulation path on the discharge side of the cleaning pump 3. Road 5
8 is a lower cleaning nozzle rotatably arranged in the tank 2 communicating with the second circulation path 7; 9 is a lower cleaning nozzle connected to the first circulation path 5; Communication tank 2
This is an upper cleaning nozzle that is rotatably arranged inside.

10.11 is a tableware basket.

Next, the specific configuration of the heating device 6 will be explained.

A pipe body 12 has a cylindrical shape, and both ends thereof are connected to hoses 5a and 5b constituting the first circulation path 5.

The pipe body 12 is made of a heat-resistant material, such as a ceramic material, a metal material such as copper, aluminum, or stainless steel,
A material with as good thermal conductivity as possible can be used.

13 is a heater rod wound and fixed on the outer peripheral surface of the pipe body 12;
For example, it is configured with a sheathed heater, a nichrome wire heater, etc.

14 is a core placed in the center of the hollow part of the pipe body 12;
The pipe body 12 has a substantially cylindrical shape long in the length direction, and both ends thereof are tapered into conical shapes.

Reference numeral 15 denotes a liquid passage portion formed between the inner surface of the pipe body 12 and the core 14, and the cross-sectional opening area of the liquid passage portion 15 is compared to the cross-sectional opening area of the pipe body 12 without the core 14. It has contracted into an almost ring shape.

It is preferable that the core 14 is made of the same material as the pipe body 12, and especially when the pipe body 12 and the core 14 are made of metal, it is preferable that both members be made of the same material. .

This is to prevent the inconvenience that when the constituent materials of both members are changed, a potential difference is generated between the two due to a difference in ionization tendency, and a metal with a less ionization tendency is corroded.

The core 14 can be fixed in various ways, such as by taking out the mounting legs 14a from the core 14 and fixing them to the pipe body 12, or by protruding a projecting piece for supporting the core 14 from the pipe body 12. There are several possible configurations, and it does not matter what method is adopted.

However, it is better to avoid a configuration that unnecessarily increases the flow resistance of the cleaning liquid. It is also recommended that not only the supporting structure of the core 14 but also the core 14 have a shape that does not increase the flow resistance. As mentioned above, it is preferable that both ends of the core 14 be tapered.

Here, the hoses 5a, 5 constituting the first circulation path 5 are
The cross-sectional opening area of b is equal to the cross-sectional opening area of the liquid passage portion 15.

That is, the hose 5a. The diameter of the pipe body 12 is made larger than the diameter 1 of the pipe body 5b to provide the relationship of cross-sectional opening area as described above.

A specific example regarding this point will be described.

The inner diameter 1 of the hoses 5a and 5b is 30 mm, and the cross-sectional opening area thereof is 706.5-.

Further, the inner diameter of the pipe body 12 is 421rrIIt, and the cross-sectional opening area thereof is approximately 1400-.

Further, the outer diameter L' of the core 14 is 3oTIrJn, and its cross-sectional area is 706.5rrrA.

Therefore, the cross-sectional opening area of the liquid passage portion 15 is the hose 5av5b.
This is approximately the same as the risk of

According to the above configuration, by arranging the core 14 approximately at the core inside the pipe body 12, the flow rate of the cleaning liquid in the liquid passage portion 15 is increased, and the adhesion of foreign matter to the inner wall of the pipe body 12 can be reduced. It is possible to have the effect of peeling off foreign matter that has adhered to the pipe body 12, thereby suppressing a rise in the temperature of the pipe body 12 itself, and extending the life of the entire heating device mainly including the heater 13.

Furthermore, by making the cross-sectional shape of the liquid passage portion 15 substantially ring-shaped, the flow can be brought closer to the inner wall of the pipe body 12,
Improves heat exchange performance and shortens liquid temperature rise time.

Further, the cleaning liquid passing through the liquid passage section 15 is supplied to the cleaning pump 3.
The discharge pressure is ejected from the upper washing nozzle 9 to wash the dishes, but if the core 14 is placed in the pipe body 12 having the same diameter as the hoses 5a and 5b, the liquid passing portion 15 The cross-sectional opening area of the cleaning pump 3 becomes considerably small, and the discharge pressure of the cleaning pump 3 decreases.

However, in the above embodiment, since the cross-sectional opening areas of the liquid passage section 15 and the first circulation path 5 are approximately the same, the discharge pressure of the cleaning pump 3 does not decrease, and a large amount of water is discharged from the upper cleaning nozzle 9. Water is ejected vigorously, improving cleaning performance.

As described above, according to the present invention, it is possible to prevent foreign matter from adhering and accumulating on the wall of the pipe body of the heating device, thereby preventing abnormal temperature rises in the pipe body and heater, and improving heat exchange performance. Furthermore, even with a configuration in which the core is inserted substantially into the center of the pipe body, it is possible to prevent the discharge pressure of the cleaning pump from decreasing, and to improve the cleaning performance of tableware.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a dishwasher according to an embodiment of the present invention, Fig. 2 is a longitudinal sectional view of its heating device, and Fig. 3 is a longitudinal sectional view taken along line X-X'.
4 is a sectional view taken along line Y-Y' in FIG. 2. 2...Tank, 3...Washing pump, 5
...(first) circulation path, 6...heating device, 9...upper cleaning nozzle, 12...
Pipe body, 13... Heater, 14...
Core, 15...Liquid passage part.

Claims (1)

[Scope of utility model registration request] A tank containing tableware, a cleaning liquid jetting nozzle rotatably disposed within the tank, a cleaning pump having a discharge side connected to the nozzle via a circulation path, and a heating device disposed in the middle of the circulation path. The heating device includes a pipe body made of a heat-resistant material with a heater arranged on the peripheral wall, and a core disposed approximately at the core of the inner hollow part of the pipe body. A dishwasher in which the cross-sectional opening area of a substantially ring-shaped liquid passage portion formed between the body wall and the internal body wall is approximately equal to the cross-sectional opening area of the circulation path.