JP4018062B2 - Dishwasher and drainage cooling unit - Google Patents

Description

  The present invention relates to a dishwasher. In particular, the present invention relates to a technique for preventing deterioration of a drain pipe or the like having low heat resistance by cooling and draining hot washing water drained from a dishwasher.

An example of the operation flow of the dishwasher is shown in FIG. In the dishwasher, when the dishes are stored in the dish basket provided in the washing tank in step S102, and the detergent is introduced in step S104, the washing process (step S106) and a plurality of rinse processes (step S108, 110, 112) to clean the dishes. At the end of the rinsing process, a high temperature rinsing process (step S114) is performed. In the high temperature rinsing process, rinsing is finished with hot water having a temperature higher than that in the previous rinsing process, and at the same time, the dishes and the washing tank are sterilized. In step S116, the dish that has been washed is dried, and the operation of the dishwasher is completed.
In the high temperature rinsing process in step S114, rinsing is performed using hot water of about 70 ° C. for sterilization. In recent years, dishwashers have been developed that can perform high temperature rinsing with warm water of 77 ° C. or higher in order to sterilize more carefully. In any case, the washing water immediately after the completion of the high temperature rinsing step is very hot.
Resin pipes and drainage parts in houses where dishwashers are installed may be made of resin with a heat-resistant temperature of around 60 ° C or members with a high coefficient of thermal expansion. The high temperature used in the high-temperature rinsing process If the washing water is drained as it is, the resin drainage parts and drainage pipes having low heat resistance may be damaged or deteriorated, and other members may be deformed due to rapid thermal expansion.

In the field of dishwashers, it is a big problem that hot water must be drained, and various companies are taking various measures.
In the tableware washing machine of patent document 1, it passes through a water supply channel in a drainage channel. Drain after exchanging heat between high temperature drainage and low temperature feed water.
In the tableware washing machine of patent document 2, after completion | finish of a high-temperature rinse process, the ventilation fan provided in the washing tank is operated, and after draining, after cooling high temperature washing water.
In the tableware washing machine of patent document 3, draining piping etc. are prevented from being overheated by draining intermittently.
In the tableware washing machine of patent document 4, low temperature water is supplied and mixed to a drainage channel, and the waste water cooled by mixing with low temperature water is drained.
Japanese Patent Application Laid-Open No. 11-346979 JP 2003-047583 A Japanese Patent Laid-Open No. 08-131390 JP 2000-14621 A

In order to shorten the operation time of a dishwasher, the case where hot water is supplied to the dishwasher from a water heater is increasing. In this case, since hot washing water is supplied to the dishwasher, there is no need to heat the washing water supplied to the dishwasher, and the operation time of the washing machine is shortened accordingly.
The techniques disclosed in Patent Documents 1 and 4 cannot be used when hot water is supplied from a water heater to a dishwasher. This is because the feed water for cooling the high temperature waste water has already been heated, and the waste water cannot be cooled using the feed water. In order to use the techniques of Patent Documents 1 and 4, it is necessary to connect not only a water heater to the dishwasher but also a tap water supply path. Duplicating the water supply channels is very cumbersome and impractical.
In the technique of Patent Document 2, after the high temperature rinsing process is completed, the blower fan is operated to cool the high temperature rinsing water. Since cooling takes time, the operation time of the dishwasher becomes long. Moreover, there is also a problem that the tableware is cooled together with the high-temperature rinse water, and the drying time of the tableware becomes long.
In the technique of Patent Document 3, since the drainage stop time is required, there remains a problem that the operation time of the dishwasher becomes long.

At present, there are no satisfactory measures for draining hot rinse water. Although it is reasonable to mix with low-temperature cooling water and cool and drain the water at once, it is reasonable, but when water is supplied from a water heater, low-temperature cooling water cannot be obtained.
The present invention overcomes the above problems and provides a dishwasher that can be drained after lowering the temperature of the hot rinse water. An object of the present invention is to provide a technique that functions even when water is supplied from a water heater to a dishwasher.

A dishwasher embodied by the present invention includes a washing tank for storing and washing dishes, a water supply path for supplying washing water to the washing tank, a drainage path for draining washing water from the washing tank, and cooling water. A tank for storing water, a branch path connecting the water supply path to the tank, a cooling water supply path for supplying the cooling water stored in the tank to the washing tank or the drainage path, and a branch from the water supply path at the initial stage of the first water supply process A valve that connects the water supply path and the washing tank and connects the water supply path and the cleaning tank to disconnect the water supply path and the branch path, and a valve that opens the cooling water supply path after the high temperature rinsing process. It has.
In this dishwasher, cooling water is stored in the tank at the initial stage of the first water supply process in order to connect the water supply path and the branch path at the initial stage of the first water supply process. When cooling water is stored in the tank, the water supply channel and the cleaning tank communicate with each other and are supplied to the cleaning tank. Thereafter, a normal cleaning operation is performed.
When the high temperature rinsing process is completed, the cooling water supply passage is opened, and the cooling water stored in the tank is supplied to the washing tank or the drainage passage. The high temperature rinse water drained out of the dishwasher is mixed with the cooling water stored in the tank and cooled, and does not cause a problem even when the heat resistance of the drainage equipment installed in the house or the like is low.
This dishwasher does not cause a problem even when connected to a water heater. In the initial stage of the first water supply process, water in the pipe connecting the water heater and the dishwasher is supplied. Since the water in the pipe is cooled while it is stopped in the pipe, it is possible to store low-temperature cooling water in the tank even if the dishwasher uses a method of supplying water from the water heater. . Normally, when water is supplied to a dishwasher from a water heater, the cooled water in the pipe is supplied to the washing tank and then drained, and then hot wash water that starts to be supplied from the water heater is used. Start cleaning. This is because it is faster to heat the hot water to the set temperature in the washing tank after waiting for the hot water to start being supplied from the water heater than to heat the cold water to the set temperature in the washing tank. In this case, the water cooled while being stopped in the pipe is wasted. The dishwasher of the present invention is extremely rational because it stores and uses water, which has been wasted in the past, in a tank.
It cannot be said that the hot water from the water heater is not supplied to the dishwasher from the start of the operation of the dishwasher. In this case, hot water is stored in the tank. Even if hot water is stored in the tank, it takes some time to complete the high temperature rinsing process after the dishwasher starts operation. The hot water is cooled to such an extent that it can be used as cooling water. This dishwasher is used connected to a water heater, and does not cause a problem even when high-temperature water is supplied from the initial stage of the first water supply process.

A three-way valve is provided at the branch point of the water supply channel and the branch channel, and the water supply channel and the branch channel between the branch point and the washing tank also serve as the cooling water supply channel, switching between communication / non-communication between the water supply channel and the branch channel It is preferable that the open / close valve of the cooling water supply path and the cooling water supply path are constituted by the three-way valve.
In this case, the piping system is simplified, and with one three-way valve, the cooling water can be stored in the tank, and the cooling water can be supplied when necessary to cool the drainage.

Measures against hot rinse water are additional and not required for all dishwashers. When it is installed in a house with high heat resistance of drainage equipment, high temperature drainage measures are not required.
Therefore, it is preferable to make it unitized so that it can be added to the dishwasher when necessary. The unit in this case includes a three-way valve inserted in the middle of a water supply path for supplying cleaning water to the cleaning tank, and a cooling water tank connected to the three-way valve.
This unit is very simple composed of a three-way valve and a cooling water tank, but is extremely effective for high temperature drainage.
Alternatively, a branch path connected in the middle of the water supply path, a cooling water tank connected to the branch path, and a water supply path upstream of the branch point by connecting the water supply path and the branch path upstream of the branch point The state where the water supply channel downstream from the branch point is not in communication, the water supply channel upstream from the branch point and the branch channel are disconnected, and the water supply channel upstream from the branch point and the water supply channel downstream from the branch point Cooling of drainage by a valve that can be switched between the state in which the water is communicated, a cooling water supply path that connects a tank and a drain for draining cleaning water from the washing tank, and a valve that opens and closes the cooling water supply path A unit may be configured.
When this unit is used, high-temperature drainage countermeasures can be easily implemented when high-temperature drainage countermeasures are required.

The present invention provides a dishwasher that can cool and drain hot rinse water.
The high-temperature rinse water is mixed with the cooling water stored in the tank, cooled, and then drained. Even if the heat resistance of the drainage equipment installed in the house is low, no problem occurs.
The dishwasher of the present invention does not cause a problem even if it is used by connecting to a water heater and supplying high-temperature water, and the high-temperature rinse water can be discharged after cooling.

The best modes for carrying out the invention are listed below.
(Mode 1) A three-way valve is provided at a branch point between the water supply channel and the branch channel. The water supply path and the branch path between the branch point and the washing tank also serve as the cooling water supply path. Assuming that the port connected to the water supply channel upstream of the branch point is A, the port connected to the branch channel is B, and the port connected to the water supply channel between the branch point and the washing tank is C, at the beginning of the first water supply process, AB There is a controller that opens a gap between BC and AC, then opens an AC, closes between AB and BC, and opens a BC and closes between AB and AC after the high temperature rinsing process. . When the BC is opened after the high temperature rinsing process and the AB and AC are closed, the water supply path and the branch path between the branch point and the washing tank become the cooling water supply path, and the low-temperature cooling water stored in the tank is washed. Added to the tank.
(Mode 2) When low-temperature cooling water is added to the cleaning tank, the cleaning pump operates for a predetermined time. At this time, the washing pump is operated with the capability of preventing the sprayed water from splashing on the dishes.
(Mode 3) A branch path and a cooling water supply path are provided independently. A two-way valve is provided at the branch point, and an open / close valve is provided in the cooling water supply path. The cooling water supply channel joins the water supply channel downstream from the branch point. Assuming that the port connected to the water supply channel upstream of the branch point is A, the port connected to the branch channel is B, and the port connected to the water supply channel between the branch point and the washing tank is C, at the beginning of the first water supply process, AB There is provided a controller that opens the AC to close the AC, then opens the AC and closes the AB, and opens the open / close valve after the high temperature rinsing process.
(Mode 4) A venturi is provided in the drainage channel, and a cooling water supply channel is connected to the venturi.

Below, the dishwasher of this invention is demonstrated in detail, referring an accompanying drawing.
(Example 1) In FIG. 1, the cross section of the tableware washing machine 2 of a present Example is typically shown. A washing tub 4 is provided inside the outer case 36 of the dishwasher 2, and the dishes stored in the tableware basket 8 are washed and dried. A door 38 is provided on the front surface of the cleaning tank 4, and the cleaning tank 4 can be pulled out from the outer case 36 to put in and out dishes.

A heater 40 and an injection nozzle 10 having a plurality of openings 14 are provided at the bottom of the cleaning tank 4.
When the heater 40 is energized, it generates heat and heats the cleaning water stored in the bottom of the cleaning tank 4. Heating by the heater 40 is controlled by a controller (not shown), and the temperature of the cleaning water in the cleaning tank 4 is controlled to match a pre-programmed temperature pattern.
The injection nozzle 10 is rotatably arranged. The nozzle 10 is connected to a washing water circulation path 16 for taking washing water from a lower position of the washing tank 4. A cleaning pump 12 is provided in the middle of the cleaning water circulation path 16, and when the cleaning pump 12 is operated, cleaning water is jetted from the spray nozzle 10.

A water supply path 18 is connected to the cleaning tank 4. A water heater 28 is provided upstream of the water supply path 18, and water heated by the water heater 28 is supplied from the water supply path 18 to the dishwasher 2. The water heater 28 heats the water passing through the water supply channel 18 to a certain temperature, and stops when the water does not pass. The heating temperature of water set in the water heater 28 of the present embodiment is 60 ° C.
The water supply path 18 has a branch point, and a three-way valve 23 is provided at the branch point. The three-way valve 32 includes three ports A, B, and C. The port A of the three-way valve 23 is connected to the hot water heater 28 via an upstream water supply path 18 b that is a part of the water supply path 18. The port B of the three-way valve 23 is connected to the bottom of the tank 6 via the branch path 24. The port C of the three-way valve 23 is connected to the cleaning tank 4 via a downstream water supply path 18 a that is a part of the water supply path 18. As will be described in detail later, the branch path 24 and the downstream water supply path 18a also serve as a cooling water supply path.
The three-way valve 23 switches between communication between the ports AB, communication between the ports BC, and communication between the ports AC according to an instruction from the controller. At this time, ports that are not communicated are blocked.
The tank 6 stores cooling water. A branch path 24 is connected to the bottom of the tank 6. An overflow path 25 is connected to the upper part of the tank 6, and the overflow path 25 is connected to the downstream water supply path 18a. The capacity of the tank 6 in this embodiment is 1.5 liters. When the water supplied from the branch path 24 exceeds the capacity of the tank 6, the excessively supplied water is supplied to the washing tank 4 through the overflow path 25 and the downstream water supply path 18a.

The drainage channel 30 is connected to the lowest position at the bottom of the cleaning tank 4. The downstream end of the drainage channel 30 reaches the drainage pipe 34 of the kitchen. A drainage pump 32 is provided in the drainage channel 30, and when the drainage pump 32 is operated, water stored in the cleaning tank 4 is drained. Further, the drainage channel 30 is provided with a drainage trap 33 further downstream than the drainage pump 32, thereby preventing the backflow of drainage from the kitchen drainage pipe 34 to the cleaning tank 4.
The drain pipe 34 of the kitchen that the drainage channel 30 reaches and drains is formed of a resin having a heat resistant temperature of 60 ° C., and may be deformed when exposed to a high temperature of 60 ° C. or higher.

FIG. 2 shows the time elapsed from the start of operation of the dishwasher in the dishwasher 2 of the present embodiment on the horizontal axis, and the temperature of the washing water in the washing tank 4 and the branch 24 are supplied to the tank 6. The figure which took the change of the quantity of the amount of water and the quantity of the water supplied to the branch path 24 from the tank 6 as a vertical axis | shaft is shown. In FIG. 2, the scale of the time axis is partially changed for clarity of illustration. Based on FIG. 2, the operation content of the dishwasher 2 is demonstrated in detail.
The tableware washing machine 2 of a present Example performs a washing | cleaning process, three rinse processes, a high temperature rinse process, and a drying process, and wash | cleans and dries tableware. In the high temperature rinsing step, either a normal course in which rinsing is performed with hot water at 70 ° C. or a high temperature course in which warm water is performed at 77 ° C. can be selected at the start of operation.

When tableware is stored in the tableware basket 8 of the washing tub 4, the detergent is introduced, and the course selection of the high temperature rinsing process is performed, the operation of the dishwasher 2 is started. Water is supplied from the water supply path 18, and the water heater 28 starts heating. At this time, according to an instruction from the controller, the three-way valve 23 opens between AB and closes between BC and AC. An upstream water supply path 18 b that is a part of the water supply path 18 is communicated with the branch path 24. When the operation of the dishwasher 2 is started, water supplied at the time of the previous dishwashing remains in the pipe connecting the water heater 28 and the three-way valve 23, and this water is almost equal to room temperature. It is cooled. This low-temperature water passes through the branch path 24 and is stored in the tank 6.
The controller measures the time from the start of operation of the dishwasher 2, that is, the time from the start of water supply to the tank 6. After the estimated time that the amount of water supplied to the tank 6 reaches the capacity of the tank 6, the controller switches the port of the three-way valve 23, opens AC, and closes AB and BC. As a result, the upstream water supply path 18 b and the downstream water supply path 18 a communicate with each other, the branch path 24 is closed, and water is supplied from the water heater 28 to the cleaning tank 4 through the water supply path 18.
The capacity of the tank 6 in this embodiment is 1.5 liters. When water exceeding the capacity of the tank 6 is supplied to the water supply to the tank 6, an amount of water exceeding the capacity is supplied to the cleaning tank 4 through the overflow path 25 and the downstream water supply path 18a.

  As means for grasping the water supply status to the tank 6, instead of measuring the water supply time to the tank 6, the water level in the tank 6 may be directly measured using a water level meter such as a float. In this case, the controller measures the water level of the tank 6 and switches the port of the three-way valve 23 when the amount of water supplied to the tank 6 reaches the capacity of the tank 6.

When the cleaning process is started, the three-way valve 23 opens the water supply path 18 and water supply to the cleaning tank 4 is started.
In the cleaning process, the minimum temperature of the water stored in the cleaning tank 4 and the temperature of the cleaning water used in the cleaning process are set. The minimum temperature of the water stored in the cleaning tank 4 in this embodiment is 40 ° C., and the set temperature of the cleaning water in the cleaning process is 60 ° C.
When the temperature of the water supplied to the washing tank 4 is lower than the set minimum temperature, the supplied water is drained as it is. In this embodiment, in order to supply water to the tank at the time of the initial hot water supply, the temperature of the water stored in the washing tub 4 is 40 ° C. or higher unless the distance between the water heater 28 and the dishwasher 2 is very long. It is prevented from draining into the water. When the temperature of the water supplied to the cleaning tank 4 has reached the minimum temperature, the water is stored in the cleaning tank 4 and is heated by the heater 40 until it reaches the set temperature of the cleaning process.
When a predetermined amount of warm water is stored in the washing tank 4, the water supply is stopped. Washing of the dishes is performed by the hot water in the washing tank 4 and the detergent that has been added. The washing pump 12 is operated, and the washing water in which the detergent is dissolved is sucked into the washing water circulation path 16 and supplied to the nozzle 10. Wash water is sprayed onto the tableware from the plurality of openings 14 provided in the nozzle 10 to remove the stain on the tableware. While the dishes are being washed, the heater 40 keeps the washing water at the set temperature.

When the cleaning process for a predetermined time is completed, the cleaning pump 12 is stopped. The heater 40 stops the heat retention of the washing water. The drainage pump 32 is operated to drain the cleaning water stored at the bottom of the cleaning tank 4 from the drainage channel 30 to the kitchen pipe 34.
Since the set temperature of the cleaning water in the cleaning process is 60 ° C., the temperature of the drained cleaning water is 60 ° C. or less. Since the temperature of the wash water to be drained is equal to or lower than the heat resistance temperature of the drain pipe 34, the drain pipe 34 is not likely to be damaged by the heat of the wash water. Wash water is drained as it is.

When drainage of the cleaning water used in the cleaning process is completed, the drainage pump 32 is stopped and new cleaning water is supplied from the water supply path 18 to the cleaning tank 4. The rinsing process is started.
In the rinsing step, the temperature of the washing water for rinsing is set lower than that in the washing step. Further, since the rinsing process is performed immediately after the cleaning process, the temperature of the water remaining in the water supply channel 18 is not so lowered. For this reason, in the rinsing process, the minimum temperature of the water stored in the cleaning tank 4 is not set, and the supplied water is immediately stored in the cleaning tank 4.
When a predetermined amount of warm water is stored in the washing tank 4, the water supply is stopped and the rinsing of the tableware is started. The washing pump 12 is operated to suck up the hot water, and the hot water is jetted from the plurality of openings 14 provided in the nozzle 10 to the tableware to remove the detergent and dirt remaining in the tableware. While the tableware is being rinsed, the heater 40 keeps the washing water at the set temperature. When rinsing is performed for a predetermined time, the cleaning pump 12 is stopped, the heater 40 is stopped, the drain pump 32 is operated, and the cleaning water is drained from the drainage channel 30 to the kitchen pipe 34. Since the set temperature of the washing water in the rinsing process is lower than that in the washing process, the drain pipe 34 is not damaged by the heat of the washing water, and the washing water is drained as it is.
The same rinsing process is repeated three times to complete the rinsing process.

When the three rinsing steps are completed, the high temperature rinsing step is started. New cleaning water is supplied to the cleaning tank 4 from the water supply path 18. The controller determines the set temperature of the high temperature rinsing process according to the course set at the start of operation. In the high temperature rinsing process, the minimum temperature of the water stored in the cleaning tank 4 is not set, and the supplied water is immediately stored in the cleaning tank 4 and heated to the set temperature by the heater 40.
When a predetermined amount of warm water is stored in the washing tank 4, the water supply stops. The washing pump 12 is operated to suck up the hot water, and the hot water is jetted from the plurality of openings 14 provided in the nozzle 10 to the tableware, thereby rinsing and sterilizing. The heater 40 warms the cleaning water to a set temperature and maintains the set temperature for a certain period. In FIG. 2, when the normal course is set, the temperature of the cleaning water maintained in the cleaning tank 4 is indicated by a solid line, and when the high temperature course is set, the temperature of the cleaning water maintained in the cleaning tank 4 is set. Shown in broken lines.

  When rinsing is performed for a predetermined time with high-temperature washing water, the washing pump 12 stops and the heater 40 also stops. At this time, about 3 liters of hot cleaning water is stored at the bottom of the cleaning tank 4. The temperature of the stored wash water is almost the same as that used in the high temperature rinsing process. That is, when the normal course is performed, the temperature is about 70 ° C., and when the high temperature course is performed, the temperature is about 77 ° C. If 3 liters of washing water having a high temperature is drained as it is, the kitchen drain pipe 34 may be damaged due to high heat. In order to prevent the drain pipe 34 from being damaged, a process for cooling the washing water is performed.

When rinsing with high-temperature washing water is completed, the controller 3 instructs the three-way valve 23 to open between BC and close between AB and AC, and all the cooling water stored in the tank 6 flows downstream from the branch path 24. It is supplied to the cleaning tank 4 via the side water supply path 18a. When the cooling water is supplied, the cleaning pump 12 operates again to mix the cleaning water and the cooling water.
As a result of verifying the temperature of the whole mixed water by experiments, 1.5 liters of cooling water of about 25 ° C. was mixed with the washing water of about 77 ° C. after the high temperature course was performed. The subsequent water temperature was 59 ° C., which is lower than the heat resistance temperature of the drain pipe 34. As a result, it was confirmed that when the washing water was mixed with the cooling water and then drained, there was no risk of the drain pipe 34 being damaged by heat.

The operation time of the cleaning pump 12 when mixing the cleaning water and the cooling water is very short, and the water coming out of the nozzle 10 is not so pressurized. For this reason, the wash water having a reduced temperature is not applied to the contained tableware, and the temperature of the tableware is kept high when the high temperature rinsing is finished.
When the cleaning pump 12 is stopped again, the drain pump 32 is operated, and the water stored at the bottom of the cleaning tank 4 becomes low temperature and drains from the drain channel 30 to the drain pipe 34 of the kitchen.

  When the high temperature rinsing process is completed, warm air is supplied to the cleaning tank 4 and the drying process is performed. The stored dishes are dried by the warm air. The tableware in the washing tub 4 is kept at a high temperature, and the drying process is completed in a short time.

  When the high temperature rinsing process is completed, the dishwasher 2 in the present embodiment supplies the cooling water from the tank 6 to the high temperature washing water stored in the washing tank 4 and mixes it, and the temperature of the mixed water is adjusted. The temperature is lower than the heat resistance temperature of the drain pipe. Since low temperature water is drained from the drainage channel 30, the drainage pipe 34 of the kitchen is not likely to be damaged by heat. Moreover, since the cooling water supplied to the washing tank 4 is mixed with the washing water at the bottom of the washing tank 4, the tableware housed in the upper part is not cooled. As a result, the tableware can be dried in a short time.

  The dishwasher 2 does not have to be provided with the water heater 28 upstream of the water supply channel 18. The washing water stored in the washing tank 4 in the high temperature rinsing process is water heated to the set temperature by the heater 10. The cooling water stored in the tank 6 is water that has stopped in the pipe at the previous dishwashing and has been cooled to approximately the same as the room temperature. The temperature of the washing water and the temperature of the cooling water do not depend on the temperature of the water passing through the water heater 28. Therefore, the presence or absence of the water heater 28 does not affect the cooling of the high temperature rinse water drainage, which is the gist of the present invention.

(Example 2) In FIG. 3, the cross section of the tableware washing machine 42 of a present Example is shown typically. About the thing of the same structure as 1st Example, the same code | symbol is provided and duplication description is omitted. In the dishwasher 42 of the present embodiment, the branch path 20 and the cooling water supply path 27 are provided independently.
A two-way valve 22 is provided at the branch point of the water supply path 18. The two-way valve 22 includes three ports A, B, and C. The port A of the two-way valve 22 is connected to the water heater 28 via an upstream water supply path 18 b that is a part of the water supply path 18. The port B of the two-way valve 22 is connected to the upper part of the tank 6 via the branch path 20. The port C of the two-way valve 22 is connected to the cleaning tank 4 via a downstream water supply path 18 a that is a part of the water supply path 18. The two-way valve 23 switches between communication between the ports AB and communication between the ports AC according to an instruction from the controller. At this time, ports that are not communicated are blocked.
The cooling water supply path 27 has one end connected to the bottom of the tank 6 and the other end connected to the downstream water supply path 18a. An opening valve 26 is provided in the middle of the cooling water supply path 27, and the cooling water supply path 27 can be switched between an open state and a closed state. The opening / closing of the release valve 26 is controlled by a controller.

  A branch path 20 and an overflow path 25 are connected to the upper part of the tank 6, and the overflow path 25 is connected to the downstream water supply path 18a. When the water supplied from the branch path 20 exceeds the capacity of the tank 6, the excessively supplied water is supplied to the washing tank 4 through the overflow 25 and the downstream water supply path 18a.

As in the first embodiment, the dishwasher 42 of the present embodiment performs a cleaning process, three rinsing processes, a high temperature rinsing process, and a drying process after supplying low temperature water to the tank 6. .
When tableware is stored in the tableware basket 8 of the washing tub 4, the detergent is introduced, and the course selection of the high temperature rinsing process is performed, the operation of the dishwasher 42 is started. Water is supplied from the water supply path 18, and the water heater 28 starts heating. At this time, according to an instruction from the controller, the two-way valve 22 opens AB and closes AC. An upstream water supply channel 18 b that is a part of the water supply channel 18 is communicated with the branch channel 20. The controller closes the on-off valve 26 at the same timing. The cooling water supply path 27 is shut off.
When the operation of the dishwasher 42 is started, water supplied at the time of the previous dishwashing remains in the pipe connecting the water heater 28 and the two-way valve 22, and this water is almost equal to room temperature. Has been cooled to. This low-temperature water passes through the branch path 20 and is stored in the tank 6.
The controller measures the time from the start of operation of the dishwasher 2, that is, the time from the start of water supply to the tank 6. After the estimated time that the amount of water supplied to the tank 6 reaches the capacity of the tank 6, the controller switches the port of the two-way valve 22, opens AC, and closes AB. As a result, the upstream water supply path 18 b and the downstream water supply path 18 a communicate with each other, the branch path 20 is closed, and water is supplied from the water heater 28 to the cleaning tank 4 through the water supply path 18.
As means for grasping the water supply status to the tank 6, instead of measuring the water supply time to the tank 6, the water level in the tank 6 may be directly measured using a water level meter such as a float.

  A high temperature rinsing step is performed after the water supply to the tank 6, the washing step, and the three rinsing steps. In the high-temperature rinsing process, when rinsing with high-temperature washing water is completed, the on-off valve 26 is opened by an instruction from the controller. The cooling water supply path 27 is communicated, and all the cooling water stored in the tank 6 is supplied to the cleaning tank 4 via the cooling water supply path 27 and the downstream water supply path 18a. When the cooling water is supplied, the cleaning pump 12 is operated to mix the cleaning water and the cooling water. When the cleaning pump 12 is stopped again, the drain pump 32 is operated, and the water stored at the bottom of the cleaning tank 4 becomes low temperature and drains from the drain channel 30 to the drain pipe 34 of the kitchen.

  As in the first embodiment, the dishwasher 42 of this embodiment supplies cooling water from the tank 6 to the hot wash water stored in the wash tank 4 and mixes it when the high temperature rinsing process is completed. The temperature of the mixed water is lower than the heat resistance temperature of the drain pipe. Since low temperature water is drained from the drainage channel 30, the drainage pipe 34 of the kitchen is not likely to be damaged by heat. Moreover, since the cooling water supplied to the washing tank 4 is mixed with the washing water at the bottom of the washing tank 4, the tableware housed in the upper part is not cooled. As a result, the tableware can be dried in a short time.

(Example 3) In FIG. 4, the cross section of the tableware washing machine 52 of a present Example is typically shown. About the thing of the same structure as 2nd Example, the same code | symbol is provided and duplication description is omitted.
In the drainage channel 44 of the dishwasher 52 of this embodiment, a venturi 46 having a locally reduced cross-sectional area is provided. The venturi 46 is disposed between the drain pump 32 and the drain trap 33. A cooling water supply passage 48 extending from the bottom of the tank 6 is connected to the drainage passage 44 by a venturi 46. The on-off valve 26 is provided in the middle of the cooling water supply path 48, and the flow rate of the cooling water supply path 48 when the on-off valve 26 of this embodiment is opened is the amount of washing water drained from the drainage path 44. It is adjusted to about 1/2 of the flow rate. In order to use the venturi 46, the non-pressurized cooling water can be mixed into the wastewater that is pressurized and delivered by the drainage pump 32.

  As in the second embodiment, the dishwasher 52 of the present embodiment performs a washing process, three rinsing processes, a high temperature rinsing process, and a drying process after supplying low temperature water to the tank 6. . When the high temperature rinsing process is completed, the on / off valve 26 of the cooling water supply passage 48 is opened by the controller. At the same time, the drain pump 32 provided in the drain channel 44 operates. The high-temperature washing water stored at the bottom of the washing tank 4 is drained to the drainage channel 44 and merges with the cooling water supplied from the cooling water supply channel 48. When the washing water passes through the venturi 46, the passage speed is once increased and the pressure is lowered. Therefore, cooling water that is not pressurized can be mixed into the washing water. The temperature of the water in which the washing water and the cooling water are mixed is lowered below the heat resistance temperature of the drain pipe 34. This water is drained from the drain 44 to the kitchen drain 34. Since the flow rate of the cooling water supplied from the cooling water supply channel 48 is adjusted to ½ of the flow rate of the cleaning water, the time for draining 3 liters of cleaning water and 1.5 liters of cooling water is almost the same. The drainage from the drainage channel 44 is always kept at a low temperature.

  The dishwashing 52 in the present embodiment drains high-temperature washing water discharged in the high-temperature rinsing process after mixing the cooling water in the venturi 46 of the drainage channel 44 and lowering the temperature. Since the cooling water is not supplied to the washing tank 4, the tableware stored in the washing tank 4 can be dried in a short time without being cooled until the drying step.

(Example 4) In FIG. 5, the cross section of the tableware washing machine 62 of a present Example is typically shown. About the thing of the same structure as 1st Example, the same code | symbol is provided and duplication description is omitted. The operation flow of the dishwasher of the present embodiment is the same as that of the first embodiment.

The tank 54 of the dishwasher 62 according to the present embodiment is independently arranged outside the case 36 that houses the cleaning tank 4. A branch between the water supply path 18 and the branch path 60 is provided outside the case 36. The branch path 60 also serves as a cooling water supply path. The branch path 60 extending from the bottom of the tank 54 is connected to the port B of the three-way valve 23 provided at the branch point of the water supply path 18 outside the case 36. An overflow path 55 extending from the upper part of the tank 54 is connected to a downstream water supply path 18 a that is a part of the water supply path 18 on the outside of the case 36.
When the operation of the dishwasher 62 is started, the water stopped in the pipe of the water supply path 18 is supplied to the tank 54 via the branch path 60, and the cooling water is stored in the tank 54. The cooling water stored in the tank 54 is supplied to the cleaning tank 4 via the branch path 60 and the water supply path 18 at the end of the high temperature rinsing process, thereby cooling the cleaning water.

  In the dishwasher 62 in this embodiment, since the tank 54 is independently arranged outside the case 36, the cooling water stored in the tank 54 is washed at a high temperature in the washing process and the rinsing process. It is not warmed in the tank 4 and is kept at a low temperature. Further, the case 36 is reduced in size by not accommodating the tank 54 therein, and the tank 54 can be disposed independently from the case 36. For this reason, the dishwasher 62 of the present embodiment can more freely select the installation location in the kitchen. The tank 54, the branch path 60, and the three-way valve 23 are unitized and used only when necessary. The overflow path 55 may be omitted.

(Example 5) In FIG. 6, the cross section of the tableware washing machine 72 of a present Example is shown typically. About the thing of the same structure as 2nd Example, the same code | symbol is provided and duplication description is omitted. The operation flow of the dishwasher of the present embodiment is the same as that of the second embodiment.

  The tank 54 of the tableware washing machine 72 of the present embodiment is independently arranged outside the case 36 that houses the washing tank 4. A branch between the water supply path 18 and the branch path 56 is provided outside the case 36. The branch path 56 extends from the port B of the two-way valve 22 provided at the branch point of the water supply path 18 and is connected to the upper portion of the tank 54. A cooling water supply path 58 extending from the bottom of the tank 54 is connected to a downstream water supply path 18 a that is a part of the water supply path 18 outside the case 36. An on-off valve 26 is provided in the middle of the cooling water supply path 58. An overflow path 55 extending from the upper part of the tank 54 is connected to the downstream water supply path 18a outside the case. When the operation of the dishwasher 72 is started, water that has stopped in the pipe of the water supply channel 18 is supplied to the tank 54 via the branch channel 56, and cooling water is stored in the tank 54. The cooling water stored in the tank 54 is supplied to the cleaning tank 4 via the cooling water supply path 58 and the water supply path 18 at the end of the high temperature rinsing process, thereby cooling the cleaning water.

  In the dishwasher 72 in this embodiment, since the tank 54 is independently arranged outside the case 36, the cooling water stored in the tank 54 is washed at a high temperature in the washing process and the rinsing process. It is not warmed in the tank 4 and is kept at a low temperature. Further, the case 36 is reduced in size by not accommodating the tank 54 therein, and the tank 54 can be disposed independently from the case 36. For this reason, the dishwasher 72 of a present Example can select the installation location in a kitchen more freely. The tank 54, the branch path 56, the two-way valve 22, the cooling water supply path 58, and the on-off valve 26 are unitized and are used only when necessary. The overflow path 55 may be omitted.

(Example 6) In FIG. 7, the cross section of the dishwasher 82 of a present Example is typically shown. About the thing of the same structure as 3rd Example, the same code | symbol is provided and duplication description is omitted. The operation flow of the dishwasher of the present embodiment is the same as that of the third embodiment.

  The tank 54 of the dishwasher 82 according to the present embodiment is independently arranged outside the case 36 that houses the washing tank 4. A branch point between the water supply path 18 and the branch path 56 is provided outside the case 36. The branch path 56 extends from the port B of the two-way valve 22 provided at the branch point of the water supply path 18 and is connected to the upper portion of the tank 54. A venturi 64 is provided outside the case 36 in the drainage channel 66. A cooling water supply path 68 extending from the bottom of the tank 54 is connected to a drain path 66 by a venturi 64. An opening / closing valve 26 is provided in the middle of the cooling water supply path 68. The overflow path 55 extending from the upper part of the tank 54 is connected to the downstream side water supply path 18 a which is a part of the water supply path 18 outside the case 36.

  When the operation of the dishwasher 82 is started, the water stopped in the pipe of the water supply channel 18 is supplied to the tank 54 via the branch channel 56, and the cooling water is stored in the tank 54. The cooling water stored in the tank 54 is supplied from the venturi 64 to the drainage channel 66 via the cooling water supply channel 68 at the end of the high temperature rinsing process to cool the cleaning water.

  In the dishwasher 82 in the present embodiment, since the tank 54 is independently arranged outside the case 36, the cooling water stored in the tank 54 is washed at a high temperature in the washing process and the rinsing process. It is not warmed in the tank 4 and is kept at a low temperature. Further, the case 36 is reduced in size by not accommodating the tank 54 therein, and the tank 54 can be disposed independently from the case 36. For this reason, the dishwasher 82 of the present embodiment can more freely select the installation location in the kitchen. The tank 54, the branch path 56, the two-way valve 22, the cooling water supply path 68, and the on-off valve 26 are unitized and used only when necessary. The overflow path 55 may be omitted.

Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.
For example, the timing for supplying the cooling water to the tank is not limited during the operation of the dishwasher. It is also possible to supply water after a certain time after the operation of the dishwasher.
The positional relationship when the washing tank and the tank are arranged in the dishwasher can be arbitrarily changed, and the arrangement of the water supply channel and the drainage channel can also be changed.
The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in the present specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

Sectional view of the dishwasher of the first embodiment The figure which shows typically the relationship between the operation time of the dishwasher of 1st Example, the temperature of wash water, and the supply amount of cooling water. Sectional drawing of the dishwasher of 2nd Example Sectional drawing of the dishwasher of 3rd Example Sectional drawing of the tableware washing machine of 4th Example Sectional drawing of the dishwasher of 5th Example Sectional drawing of the dishwasher of 6th Example Operation flow diagram of a conventional dishwasher

2, 42, 52, 62, 72, 82 · · Dishwasher 4 · · Washing tank 6 · 54 · · Tank 8 · · Tableware basket 10 · · Nozzle 12 · · Washing pump 14 · · Opening 16 · · Washing Water circulation path 18 .. Water supply path 18 a .. Downstream water supply path 18 b .. Upstream water supply path 20, 24, 56, 60 .. Branch path 22 .. Two-way valve 23 .. Three-way valve 25, 55. · On-off valves 27, 48, 58, 68 · · Cooling water supply channel 28 · · Water heaters 30, 44, 66 · · Drainage channel 32 · · Drain pump 33 · · Drain trap 34 · · Drain pipe 36 · · Outer case 38 ·· Door 40 · · Heater 46, 64 · · Venturi

Claims (4)

  Connect the washing tank that stores and cleans dishes, the water supply channel that supplies the cleaning water to the washing tank, the drainage channel that drains the cleaning water from the washing tank, the tank that stores the cooling water, and the water supply channel and the tank The branch path, the cooling water supply path that supplies the cooling water stored in the tank to the washing tank or drainage path, and the water supply path and the branch tank are connected to each other by connecting the water supply path and the branch path at the initial stage of the first water supply process. A dishwasher comprising: a valve that allows communication between the water supply channel and the washing tank to communicate with each other and disconnects the water supply channel from the branch channel; and a valve that opens the cooling water supply channel after the high-temperature rinsing process.   A three-way valve is provided at the branch point of the water supply channel and the branch channel, and the water supply channel and the branch channel between the branch point and the washing tank also serve as the cooling water supply channel, switching between communication / non-communication between the water supply channel and the branch channel The dishwasher according to claim 1, wherein the valve and the on-off valve of the cooling water supply path are constituted by the three-way valve.   A drainage cooling unit that is attached to a water supply channel that supplies cleaning water to a cleaning tank that stores and cleans dishes, and a three-way valve that is inserted in the middle of the water supply channel, and cooling water that is connected to the three-way valve Waste water cooling unit equipped with a tank.   A drainage cooling unit that is attached to and used in a water supply channel that supplies cleaning water to a cleaning tank that stores and cleans tableware, and is connected to a branch channel in the middle of the water supply channel and cooling water connected to the branch channel The tank and the water supply channel upstream of the branch point are connected to each other and the water supply channel upstream of the branch point is disconnected from the water supply channel downstream of the branch point, and the water supply upstream of the branch point A valve that can be switched between a state in which the water supply channel upstream of the branch point and a water supply channel downstream of the branch point are communicated with each other, and the cleaning water from the tank and the cleaning tank or the cleaning tank. A drainage cooling unit comprising a cooling water supply path for connecting a drainage drainage path and a valve for opening and closing the cooling water supply path.

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