JPH04215736A - Dish washer - Google Patents

Abstract

PURPOSE:To obtain a dish washer with a short washing time by checking the change of the soilage of the washing water circulated in the dish washer. CONSTITUTION:A light emitting element 57 and a light receiving element 58 are fitted face to face on the outer wall of a pipe B37 feeding the washing water to an upper injection nozzle 36. A microcomputer operated by signals from the light emitting element 57 and the light receiving element 58 is provided on an outer case 15. A washing timer is connected to the microcomputer and adjusts the operation period of a washing pump 32.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a dishwasher using a turbidity meter.

0002

[Prior Art] Fig. 8 is a diagram showing a conventional dishwasher shown in, for example, Japanese Utility Model Publication No. 1983-591. The installed cleaning tank 3 is a cleaning pump that circulates the cleaning water in the cleaning tank, and is rotationally driven by a cleaning pump motor 4, and the cleaning water is sprayed by a lower cleaning nozzle 5 and an upper cleaning nozzle 6. In addition, a lower basket 7 and an upper basket 8 are installed in the washing tank 2 for arranging dishes in an orderly manner in order to wash the dishes efficiently. Reference numeral 9 denotes a lid which is provided to open and close the front opening of the cleaning tank 2, the lower end of which is pivotally supported, and electrical components and the like are housed in the lid. Reference numeral 10 denotes an exhaust port provided in the front panel 12 of the lid 9 for exhausting steam generated in the cleaning tank 2 to the outside through the exhaust guide 11.

A conventional dishwasher is constructed as described above, and washing water is sprayed from the lower washing nozzle 5 and the upper washing nozzle 6 onto the lower basket 7 and upper basket 8 in which dishes are placed, and the dishes are washed. At the same time, the steam generated in the cleaning tank 2 is discharged from the exhaust guide 11 to the exhaust port 10 to the outside.

0004

[Problems to be Solved by the Invention] In the conventional dishwasher as described above, the water accumulated at the bottom of the washing tank 2 is sent to the lower spray nozzle 5 and the upper spray nozzle 6, and the water is sprayed onto the dishes and the water is recycled again. Dishes are washed by repeating the circulation operation of collecting at the bottom for a predetermined period of time. Regardless of the amount of dirt in the circulating water, the washing is done for a specified period of time, so if there is relatively little dirt, it is wasted. There was a problem that an appropriate cleaning cycle corresponding to circulating water could not be performed, such as a long cleaning time.

[0005] The present invention was made in order to solve the above problem, and an object of the present invention is to provide a dishwasher that can provide an appropriate cleaning cycle to deal with soiling of circulating water.

[0006]

[Means for Solving the Problems] A dishwasher according to the present invention includes an outer casing provided with an opening for loading and unloading tableware and a door for opening and closing this opening, and a spout nozzle disposed inside the outer casing. a cleaning tank provided with an injection nozzle having a water tank, a drainage basin provided at the bottom of the cleaning tank, a water supply line for supplying water to the drainage basin, and a circulation system line for sending cleaning water from the drainage basin to the injection nozzle. and a drainage system path extending outside the outer casing, a light emitting element is provided on one of the opposing side walls of the circulation system path, and a light receiving element that receives light from the light emitting element on the other side. It is equipped with a turbidity meter consisting of.

[0007] Furthermore, a turbidity meter is installed in the water supply system.

[0008]

[Function] The present invention includes an outer casing provided with an opening for putting in and taking out tableware and a door for opening and closing this opening, and a washing tank disposed inside the outer casing and provided with a spray nozzle having a spout. , a drainage basin provided at the bottom of this cleaning tank;
A water supply system path that supplies water to the drainage basin, a circulation system path that sends cleaning water from the drainage basin to the injection nozzle, and a drainage system path that extends outside the outer casing; By installing a turbidity meter consisting of a light-emitting element on one side of the opposite side wall of the channel and a light-receiving element that receives light from the light-emitting element on the other side, it is possible to prevent dirt from washing water passing through the circulation system. When the light from the light emitting element is blocked and the amount of dirt is reduced, the light is received by the light receiving element and the state of dirt in the washing water is detected.

[0009] Furthermore, by providing a turbidity meter in the water supply system, dirt in the water supply system can be detected.

0010

[Embodiment] FIGS. 1 to 6 are diagrams showing an embodiment of the present invention. In the figures, 15 is an outer casing of the main body 14 of the dishwasher;
An opening 17 for loading and unloading tableware 16 and a door 18 for opening and closing this opening are provided. A cleaning tank 19 is provided to partition the inside of the outer casing 15, one side of which communicates with the opening 17 and is opened and closed by the door 18. 20 is a steam vent hole drilled in the upper plate 21 of this cleaning tank, 22 is an intake hole also drilled in the lower side wall of the cleaning tank 19, and 23 is a drainage basin provided at the bottom of the steam cleaning tank 19. , has a dish-like shape and has a leftover dish receiving part 24 consisting of a convex part on one of the bottom parts. 25 is a waste separation filter installed in this drainage basin,
For example, it is made of synthetic resin and is arranged with an inclination so as to partition one side of the drainage basin 23, and forms a filtration chamber 26 between it and the side wall of the drainage basin 23. Reference numeral 27 denotes a partition wall that faces the leftover food separation filter at a predetermined distance and forms a waterway 28, and has a substantially > shape. Reference numeral 29 denotes a leftover food filter, which is removably installed inside the leftover food receiving portion 24 and made of synthetic resin, for example, and can be taken out from the leftover food receiving portion 24 by opening the door 18 . 30 is a lid that covers the leftover food receiving section 24, and 31 is a cleaning heater provided around the filtration chamber 26, which is an electric heater. A cleaning pump 32 is connected to the filtration chamber 26, and pumps up the cleaning water accumulated in the filtration chamber 26 and sends it to an injection nozzle to be described later. 33 is a lower injection nozzle, which is connected to the pipe A34 connected to the cleaning pump 32, and this pipe A3
It extends in a bar shape from side to side centering on 4, and a plurality of injection ports 35 are provided at predetermined intervals. 36 is the upper injection nozzle,
It extends in a rod shape around a pipe B37 disposed from the cleaning pump 32, and is provided with a plurality of injection ports 35. A tableware basket 38 is placed on a receiving portion 39 provided on the side wall of the washing tank 19, and is disposed above and below each of the injection nozzles 33 and 36 at two locations. Reference numeral 40 denotes a drainage pipe, which is connected to the leftover food receiving section 24 and whose tip is bent into a U-shape to prevent odor from leaking to the outside. Reference numeral 41 denotes a drainage pump, which is provided in the middle of the drainage pipe 40 so that the drainage pipe 40 is connected to both ends thereof. 42 is a water supply pipe connected to a water supply (not shown), and a solenoid valve 43
water is supplied to the cleaning tank 19. A drying heater 44 is made of an electric heating coil and is disposed between the inner wall of the outer casing 15 and the cleaning tank 19. 45 is a blower, and a motor 46 is used to convert the heat generated by the drying heater 44 into hot air.
and a blower 47. 48 is the outlet side temperature sensor,
The temperature of the steam disposed in the steam vent hole 20 and discharged from the cleaning tank 19 is detected, and a signal is sent to a control circuit to be described later. Reference numeral 49 denotes an inlet side temperature sensor, which is disposed in the intake hole 22 and detects the temperature of the hot air from the drying heater 44, and sends a signal to the control circuit. Reference numeral 50 denotes a control circuit, which is provided in the outer casing 15 and includes an inlet temperature sensor 49 and an outlet temperature sensor 48.
The drying end point is when the temperature difference △t between the
The drying heater 44 and the blower 45 are configured and connected to automatically stop when the temperature reaches the level of eg. 5
1 is a drying end sensor connected to the control circuit 50;
It is activated when the drying heater 44 stops at the end of drying, and lights up the drying end lamp 52 provided at the upper part of the outer casing 15. Reference numerals 53 and 54 denote an intake port and an exhaust port provided at the upper part of the outer casing 15. The intake port is used for taking outside air into the outer casing 15 by the blower 45 and sending it to the drying heater 44, and the exhaust port 54 is for discharging steam inside the cleaning tank 19. Reference numeral 55 denotes a detergent charging box, which stores detergent and opens its lower part during a predetermined process, and the detergent (not shown) is thrown into the box. 5
Reference numeral 6 denotes a turbidity meter, in which a light emitting element 57 is attached to the outer wall of a pipe B37 forming a circulation path, and a light receiving element 58 for receiving light from the light emitting element is mounted on the other outer wall so as to face the light emitting element 57. It is installed to detect leftover food passing through the pipe B37. 60 is a microcomputer connected to this turbidity meter, which inputs the signal generated from the turbidity meter 56;
The amount of leftover food passing through the pipe B37 is determined, and the cleaning timer 61 is operated until the amount of leftover food becomes constant, and when the amount of leftover food becomes constant, an instruction to proceed to the drainage operation is output. 7
0 is the relationship between turbidity and time when the cleaning water is heavily contaminated, 71 is the relationship between turbidity and time when there is almost no stain, 72 is the cleaning end time, and 73 is the conventional cleaning end time. This shows that.

In the dishwasher constructed as described above, the door 18 is opened, the upper and lower tableware baskets 38 are pulled out, the tableware 16 is set in the tableware basket 38, and then the door 18 is closed and the solenoid valve 43 is opened. By operating the water supply pipe 42, water enters the cleaning tank 19 and collects in the drainage basin 23. next,
By operating the washing pump 32, water is sent to the upper and lower injection nozzles 36 and 33, water is injected from the injection port 35, and the injection force rotates each of the upper and lower injection nozzles 36 and 37, and the tableware is washed. Prewash type 16. This pre-washing is performed using a turbidity meter.
At step 6, the state of passage of leftover food in the pipe B37 is detected, and at the microcomputer 60, the amount of leftover food passing through becomes constant. That is, pre-washing is performed by the washing timer 61 until there is no change in the dirt in the washing water. When there is no change in the dirt in the wash water, the pre-washing is completed, the drain pump 41 is activated, and the water is drained to the outside through the drain pipe 42. In this case, the leftovers remaining on the tableware 16 are caught in the leftover separation filter 25 while the washing pump 32 is in operation, but when moving to the draining process, they are transferred to the leftovers receiving filter 29. be captured. Next, water is supplied from the water supply pipe 42, detergent is introduced from the detergent input box 55, and the cleaning pump 32 is operated to perform cleaning. In this case, in order to increase the cleaning efficiency, the cleaning heater 31
is turned ON and OFF, the water temperature is raised and maintained, and the turbidity meter 56 and microcomputer 60 detect contamination of the wash water in the same manner as in the pre-washing. Furthermore, the drain pump 41 is operated again to drain water. Also in this case, the leftover food separation filter 25
The leftovers caught in the leftovers are moved to the leftovers receiving filter 29. Next, water is supplied from the water supply pipe 42 and circulated again by the washing pump 32 to rinse the tableware 16.
Then, the cleaning timer 61 detects the dirt in the circulating water, and the water is rinsed until there is no change in the dirt in the rinsing water, and after the water has been circulated for a predetermined period of time, it is drained. Finally, as a drying process, a blower 45
Then, the drying heater 44 is activated, and outside air is sucked in through the air supply port 53, heated by the drying heater 44, and then introduced into the washing tank 19 through the suction hole 22, and the water from the wet tableware 16 is evaporated in the final rinse. The evaporated steam is discharged from the steam vent hole 20 to the outside through the exhaust port 54. The inlet side temperature sensor 49 and the outlet side temperature sensor 48 are connected to the intake hole 22, respectively.
The temperature of the steam vent hole 20 is detected, and a signal is sent to the control circuit 50. When the temperature difference between the respective temperature sensors 48 and 49 is small and constant when the heat of evaporation disappears, the drying is completed, and the drying end sensor 51 turns on the drying end lamp. 52 is turned on, and the blower 45 and drying heater 44 are stopped. After that, the door 18 is opened and the tableware 16 is taken out, and the leftover food filter 29 is further discarded and cleaned, and the leftover food filter 29 is set in the drainage basin 23 again.

By providing the turbidity meter 56, the microcomputer 60, and the cleaning timer 61, as shown in FIG. Ending time 7
3 is significantly faster, allowing for shorter cleaning time and more efficient cleaning.

In the above embodiment, the turbidity meter 56 was installed in the pipe B37 which is the circulation system path, but as shown in FIG. By installing the filter 56, it is possible to detect dirt in the supplied water, and the above embodiment can be further improved.

[0014]

Effects of the Invention As explained above, the present invention includes an outer casing provided with an opening for taking out and putting tableware in and a door for opening and closing this opening, and an injection nozzle installed inside the outer casing and having a spout. A cleaning tank provided, a drainage basin provided at the bottom of the cleaning tank, and a water supply line that supplies water to this drainage basin,
A circulation system path for sending cleaning water from the drainage basin to the injection nozzle, and a drainage system path extending outside the outer casing, and a light emitting element is provided on one of the opposing side walls of the circulation system path. By installing a turbidity meter consisting of a light-emitting element and a light-receiving element that receives light from the light-emitting element on the other hand, the turbidity meter can detect dirt in the washing water passing through the circulation system, and its detection effect The cleaning time can be set using the , allowing for more efficient cleaning.

Furthermore, by providing a turbidity meter in the water supply system, it is possible to detect contamination of the water being supplied, thereby further improving usability.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a side view showing an embodiment of the invention.

FIG. 3 is a flowchart of a cleaning action showing an embodiment of the present invention.

FIG. 4 is a microcomputer circuit diagram showing an embodiment of the present invention.

FIG. 5 is a graph showing one embodiment of the present invention.

FIG. 6 is a circuit diagram of a temperature sensor showing an embodiment of the present invention.

FIG. 7 is a side view showing another embodiment of the invention.

FIG. 8 is a sectional view showing a conventional dishwasher.

[Explanation of symbols]

14 Dishwasher 15 Outer casing 16 Tableware 17 Opening 18 Door 19 Cleaning tank 23 Drainage basin 33 Lower injection nozzle 34 Pipe A 35 Injection port 36 Upper injection nozzle 37 Pipe B 40 Drain pipe 42 Water supply pipe 56 Turbidity meter 57 Light emitting element 58 Photo receiving element

Claims (2)

[Claims] [Claim 1] An outer casing provided with an opening for putting in and taking out tableware and a door for opening and closing this opening, a washing tank installed inside the outer casing and provided with a spray nozzle having a spout, and a washing tank provided with a spray nozzle having a spout; A drainage basin provided at the bottom of the tank, a water supply line that supplies water to the basin, a circulation system line that sends cleaning water from the drainage basin to the injection nozzle, and a drainage line that extends outside the outer casing. and a turbidity meter comprising a light emitting element provided on one of the opposing side walls of the circulation system path, and a light receiving element receiving light from the light emitting element on the other side. dishwasher. 2. The dishwasher according to claim 1, wherein a turbidity meter is provided in a water supply line.