JP2012024147A - Washer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washer cooling drainage to the outside with excellent responsiveness.SOLUTION: This dishwasher 1 includes: a washing chamber 3; rinse nozzles 13, 15 injecting water into the washing chamber 3; a rinse pump 24 supplying water from an external water heater to the rinse nozzles 13, 15; a washing tank 17 collecting and storing the water injected into the washing chamber 3 from the rinse nozzles 13, 15; a drain pipe 37 draining the drainage overflowing from the washing tank 17; a cooling water supply pipe 51 supplying cooling water into the drain pipe 37; a cooling water valve 53 opening/closing the cooling water supply pipe 51; and a controller 31 controlling the opening/closing of the cooling water opening/closing valve. The controller 31 performs at least one of valve opening delay control to open the cooling water valve 53 after delay to an operation start of the rinse pump 24 and valve closing delay control to close the cooling water valve 53 after delay to an operation stop of the rinse pump 24.

Description

  The present invention relates to a washing machine.

  Conventionally, as a technique in such a field, a dishwasher described in Patent Document 1 below is known. In this dishwasher, when the wash water (or rinse water) stored in the water tank is drained through the discharge pipe, the water flow sensor detects the drainage and outputs a drainage detection signal to the cold water mixing controller. . In response to the output, the chilled water mixing control unit opens the on-off valve, and inputs the cooling water stored in the cooling water tank into the discharge pipe. As a result, the cooling water is mixed with the high-temperature washing water, and the washing water is discharged at a low temperature. In this manner, the external drain pipe at the discharge destination is protected by not discharging the wash water at a high temperature.

JP 2000-14621 A

  However, in the said dishwasher, since cooling water is sent out corresponding to the detection of the waste_water | drain in a discharge pipe, responsiveness is bad. Accordingly, high temperature waste water may be discharged at the initial stage of drainage, and the external drain pipe at the discharge destination is not sufficiently protected.

  Then, an object of this invention is to provide the washing machine which can cool the waste_water | drain to the exterior with favorable responsiveness.

  The cleaning machine of the present invention includes a cleaning chamber for storing an object to be cleaned, an injection nozzle for injecting water into the cleaning chamber, water supply means for supplying water from the outside to the injection nozzle, and injection from the injection nozzle into the cleaning chamber. A tank that collects and stores the collected water, a drain pipe that discharges waste water that overflows from the tank, a cooling water supply pipe that supplies cooling water to cool the drain pipe, and a cooling water supply pipe A cooling water on-off valve that opens and closes, and a cooling control unit that controls opening and closing of the cooling water on-off valve based on an operating state of the water supply means, and the cooling control unit delays the operation of the water supply means and starts cooling water At least one of valve opening delay control for opening the on-off valve and valve closing delay control for closing the cooling water on-off valve by delaying the operation stop of the water supply means is performed.

  According to this cleaning machine, water from the outside is supplied to the spray nozzle by the water supply means, sprayed from the spray nozzle into the cleaning chamber, and the sprayed water is collected in the tank. When water enters the tank, excess water in the tank overflows and is discharged through the drain pipe. Cooling water is supplied to the drainage pipe through which the drainage flows through a cooling water supply pipe. According to such a flow of water, there is a certain time lag between the start of the operation of the water supply means and the occurrence of drainage due to the overflow of the tank. Similarly, there is a certain time lag from when the water supply means stops operating until the drainage stops.

  On the other hand, if the cooling control unit performs valve opening delay control and delays the operation of the water supply means to open the cooling water on / off valve, the above time lag is offset based on the operation start of the water supply means. The supply of cooling water can be started at the timing. Therefore, the cooling of the waste water can be started with a good response to the occurrence of the waste water in the drain pipe. In addition, if the cooling control unit performs valve closing delay control and delays the operation of the water supply means to close the cooling water on / off valve, the timing for offsetting the time lag is based on the operation stop of the water supply means. The supply of cooling water can be stopped. Therefore, the cooling of the drainage can be completed with good response to the termination of the drainage in the drain pipe.

  Further, the washing machine of the present invention includes a cooling water temperature sensor that detects the temperature of the cooling water, and a cooling water amount adjustment unit that adjusts the supply amount of the cooling water based on the temperature of the cooling water acquired by the cooling water temperature sensor. , May be further provided. According to this configuration, since the supply amount is adjusted according to the temperature of the cooling water, the drainage can be stably cooled even when the temperature of the cooling water fluctuates.

  Moreover, the washing machine of this invention may be provided on the drainage channel which conveys the waste_water | drain from a tank outside, and may be provided with the mixing tank which mixes waste_water | drain and cooling water. According to this configuration, the waste water and the cooling water can be sufficiently mixed and cooled in the mixing tank, and then drained to the outside.

  According to the washing machine of the present invention, the drainage to the outside can be cooled with good responsiveness.

It is a perspective view which shows the dishwasher of 1st Embodiment of this invention. It is a partially broken side view of the dishwasher of FIG. It is a schematic diagram which shows the structure of the tableware washing machine of FIG. It is a front view which shows the machine room of the tableware washing machine of FIG. It is a schematic diagram which shows the structure of the dishwasher of 2nd Embodiment of this invention. It is a schematic diagram which shows the structure of the dishwasher of 3rd Embodiment of this invention. It is a schematic diagram which shows the modification of the tableware washing machine of FIG.

  Hereinafter, a preferred embodiment of a washing machine according to the present invention will be described in detail with reference to the drawings.

(First embodiment)
As shown in FIGS. 1 to 3, the dishwasher 1 has a stainless steel washing machine body 2. The cleaning machine main body 2 is partitioned into an upper part 2a in which a cleaning chamber 3 is formed and a lower part 2b in which a machine room 4 (see FIGS. 4 and 5) is formed. Further, a column 6 extending in the vertical direction across the upper portion 2 a and the lower portion 2 b is disposed at the corner portion on the back side of the cleaning machine body 2, and the back panel 5 extends between the columns 6 and 6. is doing. An operation unit 45 that accepts a user's button operation is attached to the upper portion of one column 6.

  A box-shaped door 7 for opening and closing the cleaning chamber 3 is provided on the upper portion 2 a of the cleaning machine body 2. The door 7 is guided in the vertical direction by a pair of left and right guide rails (not shown) disposed inside the pair of left and right stainless steel columns 6 and is vertically moved by a handle 8 extending horizontally in front. Can be moved. The ends of a pair of left and right pivot arms 10 are fixed to both ends of the handle 8, and each pivot arm 10 is disposed obliquely along the side surface 7 a of the door 7. And since it is necessary to move the door 7 up and down with respect to the rotational movement of the handle 8, the upper end of the link part 16 arrange | positioned along the side surface 7a of the door 7 can rotate freely in the rotational arm 10. FIG. It is connected and the lower end of the link part 16 is connected with the door 7 via the shaft pin 16a. In addition, the leg part 9 is attached to the four corners of the bottom face of the washing machine main body 2, and the stable installation of the dishwasher 1 is possible.

  In the above-described cleaning chamber 3, a flip-up rack rail 11 is detachably disposed. On the rack rail 11, a table-like tableware in which dishes after eating and drinking (objects to be cleaned) are arranged. A rack (not shown) is placed. Furthermore, in the upper part of the cleaning chamber 3, a rotatable upper cleaning nozzle 12 having three arms extending radially and a rotatable upper rinsing nozzle 13 having two arms extending in a straight line are concentric. Is arranged. Similarly, a rotatable lower cleaning nozzle (injection nozzle) 14 and a lower rinsing nozzle (injection nozzle) 15 are concentrically disposed in the lower part of the cleaning chamber 3.

  Next, with reference to FIG.3 and FIG.4, the apparatus arrange | positioned inside the machine room 4 is demonstrated. FIG. 4 shows a state in which the stainless steel plate that covers the front surface of the lower portion 2b of the cleaning machine main body 2 is removed. As shown in the figure, the machine chamber 4 is provided with a cleaning tank 17 protruding from the cleaning chamber 3 side.

  The cleaning tank 17 is a tank in which the cleaning water in the cleaning chamber 3 is temporarily stored. In the cleaning tank 17, a water level detection device 34 that measures the water level of the cleaning water is provided. Further, a cleaning tank heater 33 for heating the stored cleaning water is provided in the cleaning tank 17. An overflow pipe 35 is provided in the cleaning tank 17 in order to discharge excess cleaning water that has overflowed in the cleaning tank 17. The overflow pipe 35 has an upper end opening at a position slightly higher than the water level detection device 34. Excess cleaning water that has passed through the upper end opening of the overflow pipe 35 is discharged out of the machine as drainage through the drain pipe 37.

  A cleaning water supply pump (hereinafter referred to as “cleaning pump”) 19 is provided in front of the cleaning tank 17. A washing water circulation pipe 21 (see FIGS. 2 and 3) is connected to the discharge port of the washing pump 19, and the washing water circulation pipe 21 passes through the inside of the washing tank 17 and the washing chamber 3 and passes through the upper washing nozzle. 12 and the lower cleaning nozzle 14.

  Further, a hot water storage tank 22 is accommodated in the machine room 4. Rinsing water is supplied to the hot water storage tank 22 through a water supply pipe 39 from an external water heater (for example, a gas water heater; not shown). The water supply pipe 39 is provided with a water supply water valve 41 to control the supply of water from the water heater. For example, the hot water storage tank 22 is provided with a water level detection device 43 that detects the water level in the tank, and the water supply water valve 41 is opened when the water level in the hot water storage tank 22 falls. Further, a hot water storage tank heater 23 for heating the rinsing water is also provided in the hot water storage tank 22. Further, an overflow pipe (not shown) is provided in the hot water storage tank 22, and the hot water storage tank 22 is under atmospheric pressure.

  A rinsing water supply pump (hereinafter referred to as “rinsing pump”) 24 is connected to the hot water storage tank 22 via a suction pipe. A discharge pipe 26 is connected to the discharge port of the rinsing pump 24, and the end of the discharge pipe 26 extends into the cleaning tank 17. A rinsing water circulation pipe 27 (see FIG. 2) is connected to the end of the discharge pipe 26, and the rinsing water circulation pipe 27 passes through the cleaning tank 17 and the cleaning chamber 3, and the upper rinsing nozzle 13. It is connected to the lower rinsing nozzle 15.

  In the machine room 4, a control box 30 is disposed below the cleaning tank 17. The control box 30 has an elongated housing 32 having a rectangular cross section. The housing 32 is disposed so as to extend in the front-rear direction in the machine room 4 and is fixed to the bottom plate of the washing machine body 2. Close to the side plate. Inside the housing 32, a control device 31 that controls the washing operation of the dishes by the dishwasher 1 is accommodated. Here, the control device 31 includes electronic components such as a relay, a transformer, a microcomputer, and a magnetic conductor, for example.

  Next, the operation of the dishwasher 1 in dishwashing will be described with reference to FIG. When the power source of the dishwasher 1 is turned on, the rinsing pump (water supply means) 24 is driven to pump the water in the hot water storage tank 22 to the rinsing nozzles 13 and 15. The water discharged from the rinsing nozzles 13 and 15 accumulates in the lower washing tank 17. Then, after a predetermined time has elapsed, the rinsing pump 24 is stopped, the water supply water valve 41 is opened, and water from the external water heater is introduced into the hot water storage tank 22 through the water supply pipe 39. When the above processing is repeated, the water level in the cleaning tank 17 reaches the position of the water level detection device 34, and then the above processing is further repeated, so that the cleaning water in the cleaning tank 17 reaches the position of the upper end opening of the overflow pipe 35. Is stored. Further, detergent is supplied to the cleaning tank 17 from a detergent supply device (not shown). The cleaning water in the cleaning tank 17 and the rinsing water in the hot water storage tank 22 are maintained at a constant water temperature by the cleaning tank heater 33 and the hot water storage tank heater 23, respectively.

  From this state, when the operation start button of the operation unit 45 is turned ON, the cleaning process is started and the cleaning pump 19 is started. Accordingly, the cleaning water stored in the cleaning tank 17 is pumped to the upper and lower cleaning nozzles 12 and 14 through the cleaning water flow pipe 21 and is sprayed from the respective cleaning nozzles 12 and 14 toward the dishes. . At this time, the cleaning nozzles 12 and 14 are rotated by the jetting reaction force of the cleaning water, so that the cleaning water is uniformly applied to the dishes and the dishes are efficiently washed away. The washing water sprayed on the tableware is collected in the washing tank 17 while removing contaminants such as leftovers washed away from the tableware by a filter, and is circulated and supplied by the washing pump 19. At this time, the cleaning water is maintained at a high temperature in the cleaning tank 17 by the cleaning tank heater 33, so that the dishes can be cleaned hygienically with the high temperature cleaning water.

  When such dishes are washed for a predetermined time, the washing pump 19 is stopped, the washing process is finished, and the rinsing process is started. When the rinsing process is started, the rinsing pump 24 is started, whereby the rinsing water stored in the hot water storage tank 22 is pumped to the upper and lower rinsing nozzles 13, 15 through the rinsing water flow pipe 27. It sprays toward tableware from each rinsing nozzle 13 and 15. At this time, the rinsing agent is supplied to the rinsing water flow pipe 27 from a rinsing supply device (not shown). Since each of the rinsing nozzles 13 and 15 is also rotated by the reaction reaction force of the rinsing water, the rinsing water is evenly applied to the dishes and the dishes are efficiently rinsed. Moreover, since the rinsing water is maintained at a high temperature by the hot water storage tank heater 23 in advance, the dishes can be rinsed hygienically with the high temperature rinsing water.

  The rinsing water sprayed on the dishes flows into the cleaning tank 17. At this time, the rinsing water continuously flows and the rinsing water in the washing tank 17 overflows, but the excess rinsing water is continuously discharged to the outside through the overflow pipe 35 and the drain pipe 37. When such rinsing of dishes is performed for a predetermined time, the rinsing pump 24 is stopped, the rinsing process is completed, and the operation of one cycle of the dishwasher 1 is completed. The operation of one cycle of the dishwasher 1 as described above is performed by the microcomputer of the control device 31 executing a predetermined program, and each of the water supply water valve 41, the heaters 23 and 33, the washing pump 19, the rinsing pump 24, and the like. This is realized by controlling the parts.

  As described above, in the rinsing process, the rinsing water overflowing from the cleaning tank 17 is discharged to the outside as drainage through the drain pipe 37. As described above, since both the washing water and the rinsing water are hot, the waste water discharged from the overflow pipe 35 is also hot. If the temperature of this waste water is too high, piping outside the discharge destination will be damaged, so it is necessary to cool it in the machine before discharging it out of the machine. Therefore, the dishwasher 1 includes a drainage cooling device 50 that cools the drainage.

  As shown in FIG. 3, the drain cooling device 50 includes a cooling water supply pipe 51 that joins the drain pipe 37. The upstream end of the cooling water supply pipe 51 is connected to a water pipe, and the tap water having a temperature lower than the drainage is supplied to the drain pipe 37 through the cooling water supply pipe 51 as cooling water. Therefore, the high-temperature waste water flowing through the drain pipe 37 is discharged outside the apparatus after the cooling water from the cooling water supply pipe 51 is mixed and cooled. Further, the drainage cooling device 50 includes a cooling water valve (cooling water on-off valve) 53 provided on the cooling water supply pipe 51. The cooling water valve 53 is an electromagnetic valve, for example, and is controlled to be opened and closed by a drive signal from the control device (cooling control unit) 31. Further, a backflow prevention device 55 is also provided on the cooling water supply pipe 51 to prevent the backflow of drainage to the cooling water source side. Further, a strainer may be provided in the drain pipe 37 on the upstream side of the junction with the cooling water supply pipe 51. Further, by providing a temperature sensor in the drain pipe 37, the drain temperature may be displayed on the operation unit 45 or the like.

  In the rinsing process, the cooling water supply by the drain cooling device 50 is performed as follows. At the start of the rinsing process, the control device 31 transmits a drive signal to start the rinsing pump 24. After a predetermined start delay time has elapsed from the transmission of the drive signal to the rinsing pump 24, the control device 31 transmits a drive signal to the cooling water valve 53 to open the valve and start the supply of cooling water to the drain pipe 37. . At the end of the rinsing process, the control device 31 transmits a stop signal to stop the rinsing pump 24. After a predetermined end delay time has elapsed since the stop signal is transmitted to the rinsing pump 24, the control device 31 transmits a drive signal to the cooling water valve 53 to close the valve so that the cooling water supply to the drain pipe 37 is stopped. . In the control as described above, the microcomputer of the control device 31 executes a predetermined program, and the start / stop of the rinsing pump 24 and the opening / closing of the cooling water valve 53 are executed according to a procedure determined by the program. It is realized by.

  The start delay time is set to about 6 seconds, for example, and the end delay time is set to about 10 seconds longer than the start delay time, for example. The settings of the start delay time and the end delay time are not fixed. For example, the user can change the setting of the start delay time and the end delay time by operating the operation unit 45. The cooling water temperature and the cooling water dynamic pressure / flow rate are set to predetermined manufacturer-specified values. The reason why the end delay time is longer than the start delay time is that the injection from the rinsing nozzles 13 and 15 does not stop immediately even when the rinsing pump 24 is stopped, but the rinsing nozzles 13 and 15 for a while after the rinsing pump 24 stops. This is because there is dripping after rinsing water from.

  In this dishwasher 1, as can be seen from the flow of the rinsing water described above, there is a certain time lag from the start of the rinsing pump 24 until the drainage of the drain pipe 37 occurs due to the overflow of the washing tank 17. . Similarly, there is a certain time lag from when the rinsing pump 24 stops until the drainage of the drainage pipe 37 finishes flowing. In view of the time lag, the control device 31 delays the start delay time from the start of the rinsing pump 24 to open the cooling water valve 53 (referred to as “valve opening delay control”). Further, the control device 31 delays the rinsing pump 24 from the stop by the end delay time and closes the cooling water valve 53 (referred to as “valve closing delay control”).

  According to the valve opening delay control, since the cooling water supply can be started at the timing of offsetting the time lag with reference to the start of the rinsing pump 24, a good response to the occurrence of drainage of the drain pipe 37. It is possible to start cooling the drainage. Further, according to the valve closing delay control, since the cooling water supply can be stopped at the timing of offsetting the time lag with reference to the stop of the rinsing pump 24, the drainage of the drain pipe 37 is good for the end of the drainage. The cooling of the drainage can be completed with responsiveness.

  As a result, it is possible to supply cooling water at an appropriate timing to the drainage of the drainage pipe 37 without excess or deficiency, to reliably cool the drainage, and to reduce wasteful cooling water discharge. That is, the cooling water supply is not in time immediately after the start of the rinsing process, and high temperature waste water is discharged outside the machine, the cooling water is supplied wastefully immediately after the start of the rinsing process, or immediately after the rinsing process is completed. It is possible to prevent the cooling water supply from being stopped and the high temperature waste water to be discharged outside the apparatus.

  Moreover, the consumption of cooling water can be stabilized and reduced by supplying the cooling water to drainage at an appropriate timing. Further, since the control of the drainage cooling device 50 is linked with the control of other parts of the dishwasher 1, error detection processing, operation display processing, setting value change processing, and the like are facilitated. Further, since the upstream end of the cooling water supply pipe 51 is connected to the water pipe, and the tap water is directly supplied to the drain pipe 37 through the cooling water supply pipe 51, it is possible to cope with continuous operation. Further, it is not necessary to provide a tank or the like for preparing cooling water in the machine, and the installation space for the drainage cooling device 50 can be minimized.

  The present invention can also be applied to a type of dishwasher in which the rinsing pump 24 is omitted. In this type of dishwasher, when the water supply water valve 41 is opened, the rinsing water is pumped to the rinsing nozzles 13 and 15 with the pressure from the external water heater through the water supply pipe 39. In this case, as the hot water storage tank, it is necessary to use a sealed hot water storage tank that does not communicate with the atmosphere, rather than an open type under atmospheric pressure. When the present invention is applied to such a dishwasher, at the start of the rinsing process, the control device 31 transmits a drive signal to the water supply water valve 41 to open the valve, and then the start delay time. A drive signal is sent to the cooling water valve 53 to open the valve with a delay by the amount of time. Further, at the end of the rinsing process, the control device 31 transmits a drive signal to the water supply water valve 41 and closes it, then delays it by the end delay time, and sends a drive signal to the cooling water valve 53. Send and close. In this case, the water supply water valve 41 corresponds to “water supply means” in the claims. The control device 31 performs both the valve opening delay control and the valve closing delay control, but may perform only one of the valve opening delay control and the valve closing delay control.

(Second Embodiment)
Then, the dishwasher 201 which is 2nd Embodiment of this invention is demonstrated, referring FIG. In the dishwasher 201, the same components as those in the dishwasher 1 are denoted by the same reference numerals in the drawings, and redundant description is omitted. The dishwasher 201 includes a drainage cooling device 250 instead of the drainage cooling device 50 of the dishwasher 1.

  Since the rinsing water and the washing water in the dishwasher 201 are controlled at a constant temperature by the hot water storage tank heater 23 and the washing tank heater 33, respectively, the temperature of the waste water hardly varies. However, the temperature of tap water varies depending on, for example, the season, and when the temperature of tap water is high in summer, there may be a case where sufficient cooling of drainage cannot be realized. Therefore, the dishwasher 201 has a function of adjusting the amount of cooling water supplied to the drain pipe 37 in addition to the function of the dishwasher 1.

  Specifically, the drain cooling device 250 includes a water temperature sensor (cooling water temperature sensor) 257 that measures the temperature of the cooling water in the cooling water supply pipe 51, and a flow rate auto that adjusts the flow rate of the cooling water in the cooling water supply pipe 51. And a regulator (cooling water amount adjusting unit) 259. The water temperature sensor 257 transmits the measured value of the water temperature to the control device 31 as a water temperature signal. The flow rate auto regulator 259 sets the flow rate based on the setting signal from the control device 31 and maintains the flow rate of the cooling water at the set flow rate.

  Then, the control device 31 determines the set flow rate of the flow rate auto-regulator 259 so that the same drainage cooling effect is always obtained based on the coolant temperature obtained by the coolant temperature sensor 257. That is, the control device 31 increases the set flow rate of the flow rate auto regulator 259 as the water temperature obtained by the water temperature sensor 257 is higher, and decreases the set flow rate of the flow rate auto regulator 259 as the water temperature obtained by the water temperature sensor 257 is lower. . The control as described above is realized by the microcomputer of the control device 31 executing a predetermined program.

  Therefore, in the dishwasher 201, the supply amount of the cooling water can be changed so as to offset the influence of the water temperature fluctuation of the tap water. Therefore, according to the dishwasher 201, drainage can be cooled stably without being affected by fluctuations in the temperature of tap water. For example, while drainage is reliably cooled even in summer when the temperature of tap water is high, cooling water can be saved in winter when the temperature of tap water is low. Further, a temperature sensor may be provided in the drain pipe, and the amount of cooling water supplied may be controlled based on the temperature of the drain. However, since the dishwasher 201 does not measure the water temperature of the waste water but measures the water temperature of the cooling water with the water temperature sensor 257, the problem that the temperature sensor is provided in the drain pipe and dust tends to collect can be avoided. Is excellent.

  A storage tank that temporarily stores cooling water from the water pipe may be provided on the upstream side of the flow rate auto regulator 259. In this case, a water temperature sensor may be provided in the cooling water storage tank, and the coolant temperature may be measured by the water temperature sensor. Further, in order to adjust the supply amount of the cooling water, the control device 31 may change the energization time of the cooling water valve 53 instead of adopting the flow rate auto regulator 259.

(Third embodiment)
Then, the dishwasher 301 which is 3rd Embodiment of this invention is demonstrated, referring FIG. In the dishwasher 301, the same components as those in the dishwasher 1 are denoted by the same reference numerals in the drawings, and redundant description is omitted. The dishwasher 301 includes a drainage cooling device 350 instead of the drainage cooling device 50 of the dishwasher 1.

  The drainage cooling device 350 includes a mixing tank 357 provided on the drainage channel. The mixing tank 357 is provided at the junction of the drain pipe 37 and the cooling water supply pipe 51, and mixes and temporarily stores the drain water and the cooling water. A water temperature sensor 359 provided in the mixing tank 357 measures the water temperature of the mixed water of the drainage and the cooling water, and transmits the measured value of the water temperature to the control device 31 as a water temperature signal. In the rinsing process, the control device 31 opens the cooling water valve 53 until the water temperature obtained from the water temperature sensor 359 falls to a predetermined water temperature. The predetermined water temperature can be set by the user by operating the operation unit 45, for example.

  The control as described above is realized by the microcomputer of the control device 31 executing a predetermined program. As shown in FIG. 7, the drain cooling device 350 has a control unit 361 that controls the cooling water valve 53 based on the water temperature signal of the water temperature sensor 359, and the control as described above is independent from the control device 31. You may do it.

  In addition, a drain hole that can be opened and closed is provided at the bottom of the mixing tank 357. The mixing tank 357 has a structure that can be separated from the cooling water supply pipe 51 and the drain pipe 37 and removed from the main body of the washing machine. With these configurations, the mixing tank 357 can be easily cleaned.

  According to the dishwasher 301, cooling water can be mixed with waste water in the mixing tank 357, and the temperature of cooling water can be reliably lowered. In addition, since the mixed water of the waste water and the cooling water is reliably in contact with the water temperature sensor 359 in the mixing tank 357, the water temperature can be stably measured and the waste water can be reliably cooled.

  The present invention is not limited to the embodiment described above. For example, the present invention is applicable not only to a door type dishwasher but also to other types of dishwashers such as a rack conveyor type and an undercounter type. Furthermore, the present invention can be applied not only to dishwashers but also to general washing machines such as appliance washing machines, glass washing machines, and conveyor washing machines.

  DESCRIPTION OF SYMBOLS 1,201,301 ... Dishwasher, 3 ... Washing room, 13 ... Upper rinsing nozzle (injection nozzle), 15 ... Lower rinsing nozzle (injection nozzle), 17 ... Cleaning tank (tank), 24 ... Rinsing pump (water supply) Means), 31 ... Control device (cooling control unit, cooling water amount control unit), 37 ... Drain pipe, 41 ... Water supply water valve (water supply means), 51 ... Cooling water supply pipe, 53 ... Cooling water valve (cooling water on / off valve) ) 257 ... cooling water temperature sensor, 357 ... mixing tank.

Claims (3)

A cleaning room for storing objects to be cleaned;
An injection nozzle for injecting water into the cleaning chamber;
Water supply means for supplying water from the outside to the spray nozzle;
A tank for collecting and storing water sprayed from the spray nozzle into the cleaning chamber;
A drain pipe for discharging waste water overflowing from the tank;
A cooling water supply pipe for supplying cooling water for cooling the drainage of the drain pipe to the drain pipe;
A cooling water on-off valve for opening and closing the cooling water supply pipe;
A cooling control unit that controls opening and closing of the cooling water on-off valve based on an operating state of the water supply means,
The cooling controller is
At least a valve opening delay control for opening the cooling water on / off valve with a delay with respect to the operation start of the water supply means, and a valve closing delay control for closing the cooling water on / off valve with a delay with respect to the operation stop of the water supply means. A washing machine characterized by performing either one of them. A cooling water temperature sensor for detecting the temperature of the cooling water;
The washing machine according to claim 1, further comprising: a cooling water amount adjusting unit that adjusts a supply amount of the cooling water based on a temperature of the cooling water acquired by the cooling water temperature sensor.   The washing machine according to claim 1 or 2, further comprising a mixing tank that is provided on a drainage channel that conveys the drainage from the tank to the outside and mixes the drainage and the cooling water.

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