JP3403072B2 - Dishwasher - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher, and more particularly to a dishwasher which drains high-temperature washing water stored in a water tank of a washing chamber from a discharge pipe.

[0002]

2. Description of the Related Art In a dishwasher in which washing water (for example, rinsing water) is drained from a discharge pipe, the discharge pipe is usually connected to a drain pipe arranged in a home. By the way, in recent years, from the viewpoint of hygiene, the temperature of rinsing water has been raised to a high temperature (eg 77
Increasingly, rinsing processes are performed at (° C).

[0003]

However, most of the drainage pipes installed in households are made of vinyl chloride, and their heat resistance temperature is higher than that of rinsing water for sterilization (eg, 77 ° C). It is as low as about 60 ° C. Therefore, when hot rinse water flows into the drain pipe made of vinyl chloride, expansion and cracks may occur as a result of overheating, and problems such as leakage of drainage may occur.

As means for solving such a problem, there is, for example, JP-A-6-62997. JP-A-6
The means disclosed in Japanese Patent Laid-Open No. -62997 discloses a method of supplying heated water (rinsing water) stored in a water tank of a cleaning chamber with water (to an extent that an abnormal water level switch does not reach a level) and stirring ( Fixed time 0.1 seconds ON-0.9 seconds OF
F), a series of operations of draining (for a fixed time) is repeated for 1 minute to lower the temperature and gradually discharge the high temperature rinse water.

However, in order to prevent overflow from the water storage tank, water can be supplied only to such an extent that the abnormal water level switch does not reach the operating water level, and the temperature drop of the heated water due to cold water mixing is small, so the initial drainage temperature is high. Until now, drainage with sufficient temperature reduction cannot be performed from the initial stage. In addition, water is required for cooling, which wastes water resources.

Therefore, according to the present invention, in a "dishwasher in which high-temperature wash water stored in a water tank of a wash chamber is drained from a discharge pipe", sterilization is performed with high-temperature wash water, and then cooling is performed. It is an object of the present invention to provide a dishwasher capable of sufficiently lowering the temperature of washing water from the beginning to the end of drainage without using water for cleaning. <Item 1>

[0007]

[Means for Solving the Problems] The solution means of the present invention taken to solve the above-mentioned problems is that "a cooling portion (133a) of the discharge pipe is formed between a cooling cover (K) covering the cooling portion (133a)". The cooling air passage (13) is provided with a fan for blowing outside air, and the downstream end of the cooling air passage (13) is a dishwasher (10
1) It is opened inside, and the fan is operated when the high temperature rinse water used in the rinsing process to sterilize the dishes is drained before the drying process. ” The above solution works as follows. According to the above solving means, the discharge pipe through which the high-temperature rinse water flowing out from the water storage tank of the cleaning chamber flows is cooled. That is, air is blown by the fan between the cooling portion (133a) of the discharge pipe and the cooling cover (K) that covers it.
Heat is exchanged between the blown air and the cooling portion (133a) of the exhaust pipe, whereby the cooling portion (133a) is cooled. Then, heat exchange is performed between the cooled cooling part (133a) and the high temperature rinse water, and the rinse water can be cooled while draining.

[0008]

EFFECTS OF THE INVENTION In addition to sufficient sterilization by high temperature rinsing water, it is possible to prevent overheating of vinyl chloride drain pipes installed in households, prevent expansion and cracks, and drain water. Problems such as leakage do not occur. Further, since the same degree of sufficient cooling can be performed from the initial stage to the final stage of drainage, there is no inconvenience that the initial temperature drop is insufficient unlike the conventional case.

Further, since it is not necessary to use water for cooling as in the conventional case, it is not necessary to use useless cooling water. [Others] <Claim 2> The solution of another invention taken in order to solve the above-mentioned problem is, “Washing water is stored a plurality of times in the water tank of the washing chamber, and each of the stored washing water is stored. Drained from the discharge pipe, at least once in a plurality of times, high temperature wash water for sterilizing dishes is stored, and when the high temperature wash water is drained, wash water at a lower temperature than this The cooling portion (133a) of the discharge pipe is cooled with a control means for controlling the drainage speed to be slower than when drained.
That is. With this product, for example, when draining the wash water for pre-washing or the wash water for the main wash, which is at a temperature necessary for washing, not at the high temperature as described above, do not drop the drainage speed and When draining the high-temperature rinse water for sterilization (rinse water) while suppressing the overall drainage time required for washing, reduce the drainage speed.
The degree of cooling of the wash water can be increased by lengthening the heat exchange time between the cooled discharge pipe and the wash water of high temperature. <Claim 3> In the invention of the above-mentioned item 2, in the case where “a fan for supplying air to the cooling part (133a) is provided”, air is sent to the cooling part (133a) by the fan and is sent. Heat is exchanged between the air and the cooling part (133a). Therefore,
The effect of cooling the cooling portion (133a) to cool the high-temperature washing water becomes greater. <4> In the above-mentioned items 1 to 3, in which “fins are provided in the cooling portion (133a)”, heat of high-temperature washing water is radiated by the fins. Specifically, in the discharge pipe, the heat dissipation area is increased by the area of the fins, and the temperature drop is increased. Therefore, the effect of cooling the discharge pipe to cool the high-temperature washing water becomes large.

[0010]

[0011]

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.
This will be described together with the illustrated example. FIG. 1 is a schematic view showing a state in which the drainage cooling means according to the present invention is installed in a dishwasher. The dishwasher will be described with reference to FIG. The dishwasher (101) has a washing chamber (103) inside, and the front of the washing chamber (103) can be opened and closed by a door (105). The door (105) has a detergent dispenser (10
7) is provided. In the washing room (103), a tableware basket (10
9) is provided, tableware (111a) is stored in the lower basket (109a),
Tableware (111b) is stored in the upper basket (109b).

A lower part of the cleaning chamber (103) is a water storage tank (113), and the water storage tank (113) stores the cleaning water (118).
The washing water (118) is supplied and drained according to the steps of prewashing, main washing, rinsing, etc., and is used for washing by circulating it by a washing pump described later. The water is stored in the water storage tank (113) by opening or closing the water supply valve (115) to supply water or hot water that has passed through the water supply pipe (117).

A heater (119) is provided in the water tank (113).
Is provided to raise the temperature of the washing water (118) and the temperature of the internal air in the drying step described later. Also,
The temperature of the washing water (118) is detected by a thermistor (121) provided in the lower part of the water storage tank (113) to detect a predetermined temperature (for example, 60 ° C for main washing, rinse water temperature for sterilization). If so, it is set to 77 ° C).

[Cleaning Step] Next, the cleaning step will be described. The washing water (118) stored in the water storage tank (113) is rotated by the washing pump (123) to rotate the nozzle (127).
And to the fixed nozzle (129). The washing water (118) sent to the rotating nozzle (127) is sprayed on the tableware (111a) contained in the lower basket (109a) while rotating. The washing water (118) sent to the fixed nozzle (129) is sprayed on the dishes (111b) in the upper basket (109b). By these jets, tableware (111a) and tableware
The dirt in (111b) is removed, and the sprayed cleaning water (118) drops downward, including dirt, and is stored again in the water tank (113). The dishes are washed by repeating this series of operations.

It should be noted that the dirt attached to the tableware (111a) and the tableware (111b) is removed by the residual food filter (125) with the circulation during cleaning. Here, as the washing water (118), there is water used for the prewashing step, the main washing step, and the rinsing step. Water or hot water is used for pre-washing, and hot water is used in a state in which the hot water contains a detergent or rinse poured from the detergent throwing device (107), and hot water is used for rinsing water. In particular, as the rinse water, not only the effect of rinsing but also the role of sterilization, so that the temperature of the rinse water is increased to 77 ° C. is used. The respective wash water is drained when each step is completed, and the drainage will be described below.

[Drainage process] For drainage, the drainage pump (131) is operated to discharge the drainage pipe (13) installed in the dishwasher (101).
3) It is done through the inside. The discharge pipe (133) is a drainage path that rises once to prevent backflow, and the drainage check valve (139) prevents backflow. And the discharge pipe
The wash water (118) flowing through (133) is drained toward the drain pipe (217).

The dishwasher (101) of the present embodiment
Is a built-in type in which the discharge pipe (133) of the dishwasher (101) is directly connected to the drain pipe (217) arranged in the home. The drain (217) is usually made of vinyl chloride,
The low heat resistance temperature is as described above. <Mechanism for cooling high-temperature wash water (rinse water)> Dishwasher (101)
A cooling air suction port (11) is formed in the upper part of the rear surface of the cooling pipe (K) that is connected to the cooling air suction port (11) and covers the cooling part (133a) of the discharge pipe (133). An air passage (13) is provided. Cooling air inlet (11) and exhaust pipe
A cooling fan (17) is provided in the cooling air passage (13) between the cooling portion (133a) of (133). Cooling air passage (1
A cooling fin (19) is attached to the cooling part (133a) of the discharge pipe (133) in (3), and a cooling air passage (13) is provided on the downstream side (lower side in the figure) of the cooling part (133a). Is open to provide a cooling air outlet (15).

The operation of this mechanism will be briefly described. Heater for sterilization in the rinse process after the cleaning process
When the rinse water heated to a high temperature (77 ° C) at (119) is drained from the water storage tank (113) after the rinsing process is finished, a drain instruction signal is output from the control unit (not shown) to the drain pump (123). At the same time, the drainage instruction signal is also output to the cooling fan (17). As a result of the output of the drainage instruction signal, the drainage pump (123) and the cooling fan (17) are activated and the hot rinse water is discharged through the cooling portion (133a) of the discharge pipe (133). The cooling part (133a) of the discharge pipe (133) is a cooling air passage.
The outside of the dishwasher (101) introduced through the cooling air inlet (11) by the operation of the cooling fan (17) inside the (13) is blown, and the cooling fin (19) keeps the high temperature. The heat of the rinse water is heat-exchanged with the blown air and radiated. Here, the cooling fin (19) is connected to the cooling portion (1) of the discharge pipe (133).
The surface area of 33a) is increased to increase the heat exchange area with the blown air, and the temperature of the cooling part (133a) is efficiently lowered.
Then, due to heat exchange between the cooled portion (133a) whose temperature has been lowered and the rinse water flowing inside, the heat of the high-temperature rinse water is radiated and the temperature is lowered.

The rinse water cooled in this way flows through the discharge pipe (133) after the cooling part (133a), and is discharged to the domestic drain pipe.
Although it flows into (217), since the temperature is sufficiently low, the drain pipe (217) is not overheated and does not expand or crack as in the case of inflow at a high temperature. There is no problem. In addition, the cooling part (133
The blast air that has been heated by exchanging heat with
The air is discharged from (15) to the outside of the cooling air passage (13). In the present embodiment, since the cooling portion (133a) is covered with the cooling cover (K), heat exchange is smoothly performed, and the cooling portion (133a) is efficient.
Is cooled.

If the dishwasher is a tabletop type,
High-temperature rinse water will be drained from the discharge pipe (133) to the sink, but in this case as well, the drain pipes installed in the home can be prevented from overheating and the hot water used by the user can be prevented. You can completely prevent the risk of touching. Further, since the same degree of sufficient cooling can be performed from the initial stage to the final stage of drainage, there is no inconvenience that the initial temperature drop is insufficient unlike the conventional case.

Furthermore, since it is not necessary to use water for cooling as in the conventional case, it is not necessary to use useless cooling water. [Drying process] Then, the dishwasher (101) performs the rinsing process and drains the water, and then executes the drying process to dry the dishware (111a) and the dishware (111b). For drying, external air is taken in from the intake port (141) by operating the fan (143), and the taken in air is the intake opening (145).
Sent to the wash room (103). The sent air is the heater
It is heated by (119) and flows toward the exhaust opening (147) while removing moisture from the dishes (111a) and the dishes (111b). Wet air flows from the exhaust opening (147) toward the exhaust port (149) and is sent to the outside. The tableware is dried by repeating this operation.

[Others] In the embodiment shown in FIG. 1, the cooling portion (133) of the discharge pipe (133).
The case where both the cooling fan (17) and the cooling fin (19) for cooling a) are used is shown, but only one of them may be used. In the embodiment of FIG. 1, the case where rinsing water is used as the high-temperature cleaning water is shown, but the high-temperature cleaning water is not limited to the rinsing water and may be other cleaning water (for example, main-cleaning cleaning water). good.

In the embodiment shown in FIG. 1, the case where the high-temperature cleaning water is used as the rinse water only once in the rinsing step has been shown, but when the rinsing step is repeated a plurality of times of water supply and drainage, a plurality of times is used. The rinsing water may be set to a high temperature, or the high-temperature rinsing water may be used plural times among the multiple times of water supply and drainage in the rinsing step (pre-washing, main washing) and rinsing step. In that case, the temperature may be 70 ° C. or higher at the same temperature, the temperature (70 ° C. or higher) may be gradually increased, or the temperature (70 ° C. or higher) may be gradually decreased.

In the embodiment shown in FIG. 1, the pre-washing, the main washing, and the rinsing are performed at the same drainage rate, but high-temperature washing water (rinsing water in the present embodiment) is used. Only when draining, slow the drainage speed to increase the heat exchange time when the high temperature rinse water passes through the cooling part (133a) of the discharge pipe (133) to further cool the rinse water. You may do it. Specifically, for example, the discharge pipe
A water amount servo that changes the passage area is provided in (133), and the water amount is throttled or the rotation speed of the drainage pump (123) is reduced by a drain water discharge instruction signal from the control unit (not shown). The drainage rate of the rinse water should be slowed.

In the embodiment shown in FIG. 1, the motors of the fan (143) and the cooling fan (17) are shown separately, but the fan (14) is used in order to reduce cost and space.
The motor of 3) and the cooling fan (17) may be combined. In the embodiment of FIG. 1, the downstream side (lower side in the figure) of the cooling air passageway (13) is opened in the dishwasher (101) to serve as the cooling air discharge port (15). If the outlet (15) is opened outside the dishwasher (101), the dishwasher (101)
Cooling is enhanced because heat is not stored inside.

In the embodiment of FIG. 1, the cooling cover (K)
Although the cooling air passage (13) is provided by the above, such a cooling air passage (13) is not always necessary.

[Brief description of drawings]

FIG. 1 is a schematic view showing a dishwasher according to an embodiment of the present invention.

[Explanation of symbols]

(101) ・ ・ ・ Dishwasher (103) ・ ・ ・ Washing room (113) ... water tank (118) ... wash water (133) ・ ・ ・ Discharge pipe (17) ・ ・ ・ Cooling fan (19) ・ ・ ・ Cooling fins (Note that the same reference numerals in the drawings indicate the same or corresponding parts.)

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) A47L 15/00-15/46 B08B 1/00-7/04

Claims (4)

(57) [Claims] 1. A dishwasher for draining high-temperature washing water stored in a water tank of a washing chamber from a discharge pipe, wherein a cooling portion (133a) of the discharge pipe and a cooling cover covering the cooling portion (133a).
(K) is provided with a fan for blowing outside air into the cooling air passage (13), and the downstream end of the cooling air passage (13) is open to the dishwasher (101). A dishwasher that operates the fan when the high-temperature rinse water used in the rinsing process for sterilizing dishes is drained before the drying process. 2. A dishwasher for draining high temperature washing water stored in a water tank of a washing chamber from a discharge pipe, wherein the washing water is stored a plurality of times in the water tank of the washing chamber. Each wash water is drained from the discharge pipe, high temperature wash water for sterilizing dishes is stored at least once in a plurality of times, and when the high temperature wash water is drained, A dishwasher comprising control means for controlling the drainage speed to be slower than when low-temperature wash water is drained, and the cooling part (133a) of the discharge pipe is cooled. 3. The dishwasher according to claim 2, further comprising a fan for blowing air to the cooling portion (133a). 4. The dishwasher according to claim 1, wherein the cooling part (133a) is provided with fins.