JP4816770B2 - dishwasher - Google Patents

Description

  The present invention relates to a dishwasher for washing dishes.

  There is a dishwasher equipped with an optical sensor for detecting the turbidity (transmittance) of a liquid used for washing dishes. As such a dishwasher, the dishwasher of patent document 1 is demonstrated.

  The dishwasher of Patent Document 1 includes a washing tub for storing tableware, a plurality of washing nozzles disposed inside the washing tub, and a washing pump that supplies washing water to the plurality of washing nozzles.

  In this dishwasher, for example, when the dishes are washed, the dishes are stored in the washing tank and a predetermined amount of washing water is supplied into the washing tank. And the washing water stored by the washing tank lower part is supplied to each washing nozzle with a washing pump.

  Washing water is sprayed from each washing nozzle onto the tableware stored in the washing tank, and the tableware is washed. The washing water sprayed on the tableware is stored at the bottom of the washing tank and is sent again to each washing nozzle by the washing pump.

  The above-mentioned dishwasher further has water dividing means. The water diversion means is connected to the plurality of washing nozzles downstream of the washing pump. A valve body is provided inside the water dividing means. By operating the valve body, the cleaning water pumped by the cleaning pump is selectively supplied to one of the plurality of cleaning nozzles.

  Further, the water distribution means is provided with detection means for detecting the turbidity of the washing water flowing through the water distribution means and detecting the operation of the valve body. As the detection means, a transmissive optical sensor including a light emitting unit and a light receiving unit is used. Based on the detection result by the detection means, the turbidity of the cleaning water at the time of cleaning by each cleaning nozzle can be detected. Thereby, it is possible to control the washing | cleaning of tableware for every washing | cleaning nozzle.

JP 2006-204565 A

  However, in the dishwasher of Patent Document 1, the water level in the water storage unit rises and falls during washing and drainage, but dirt such as oil attached to the object to be cleaned floats on the surface of the cleaning water accumulated in the water storage unit. As a result, dirt such as oil accumulated on the surface of the cleaning water adheres to a place below the maximum water level of the cleaning water and becomes contaminated. In some cases, the turbidity of washing water cannot be detected. In this case, it becomes difficult to accurately control the cleaning of the dishes for each cleaning nozzle.

  An object of the present invention is to provide a dishwasher capable of suppressing contamination of a turbidity detection unit, and further self-cleaning the turbidity detection unit with washing water sprayed from a washing means, and accurately detecting the turbidity of washing water. Is to provide.

  (1) A dishwasher according to the present invention is a dishwasher for injecting washing water to wash an object to be washed, a washing tank having a storage part for storing washing water and containing the object to be washed, and washing A cleaning means provided in the tank, a cleaning pump for pumping the cleaning water to the cleaning means, and a turbidity detection unit provided at a position higher than the maximum level of the cleaning water that can be stored in the storage part in the cleaning tank, The turbidity detection unit is provided for detecting the turbidity of the cleaning water supplied from the liquid injection port provided in the cleaning means.

  In this dishwasher, washing water is stored in a storage part of the cleaning tank. The cleaning water stored in the storage part is sent to the cleaning means by the cleaning pump, and the cleaning water is jetted onto the object to be cleaned contained in the cleaning tank, so that the object to be cleaned is cleaned. In this case, the turbidity of the washing water supplied from the liquid injection port provided in the cleaning means is detected by the turbidity detection unit.

  Here, the turbidity detection part is provided in a position higher than the maximum water level of the cleaning water that can be stored in the storage part in the cleaning tank. Therefore, when no cleaning water is supplied to the at least one cleaning nozzle, there is no cleaning water in the turbidity detection unit. Thereby, it is reduced that dirt, such as scale or oil floating on the surface of the washing water, adheres to the turbidity detection unit. Furthermore, since the washing water supplied to the turbidity detection unit from the liquid ejection port of the cleaning unit removes dirt adhering to the turbidity detection unit, contamination of the turbidity detection unit is further suppressed.

  (2) The cleaning means may have a fixed cleaning nozzle provided on the back of the inner wall of the cleaning tank, and the turbidity detection unit may detect the turbidity of the cleaning water supplied from the liquid injection port of the fixed cleaning nozzle. .

  In this case, since cleaning water is supplied to the turbidity detection unit from the fixed cleaning nozzle, the cleaning water is more reliably supplied to the fixed cleaning nozzle.

  (3) The liquid ejection port of the fixed cleaning nozzle that supplies cleaning water to the turbidity detection unit may be provided at the tip of the turbidity detection nozzle that extends from the fixed cleaning nozzle toward the turbidity detection unit.

  In this case, washing water can be supplied more reliably from the turbidity detection nozzle to the turbidity detection unit, and if the clearance between the turbidity detection nozzle and the turbidity detection unit is eliminated or adjusted to be smaller than a predetermined distance, the washing water is washed. By contacting the air in the tank, the amount of bubbles generated in the cleaning water can be reduced.

(4) The turbidity detection unit is provided so as to oppose the liquid ejection port provided at the tip of the turbidity detection nozzle and has a concave portion having a top surface that receives the cleaning water discharged from the liquid ejection port; And an optical sensor that detects the turbidity of the cleaning water based on the light transmitted through the cleaning water in the concave portion. The liquid injection port is provided at the tip of the turbidity detection nozzle attached to the fixed cleaning nozzle, and the turbidity detection nozzle is arranged in any direction from vertically upward to horizontal and is a concave portion. May be arranged so as to face the tip of the turbidity detection nozzle.

  In this case, since the cleaning water is jetted from the liquid jet port provided at the tip of the turbidity detection nozzle to the concave portion, contamination of the concave portion surface is reduced.

  According to the present invention, the contamination of the turbidity detection unit is suppressed, the turbidity detection unit is self-cleaned with the wash water supplied from the cleaning means, and the turbidity detection unit accurately detects the turbidity of the wash water. be able to.

The front view which shows the structure of the dishwasher which concerns on one embodiment of this invention The side view which shows the structure of the dishwasher which concerns on one embodiment of this invention The figure for demonstrating the several flow path connected to the water diversion mechanism of FIG. Flow chart showing the outline of operation of the dishwasher 1 is an assembled perspective view of the turbidity detection unit of FIG. Vertical section of the turbidity detector in FIG. Block diagram showing the configuration of the control system of the dishwasher Graph showing an example of the detection result of the turbidity detection unit Flow chart showing an example of control of a dishwasher in the washing and rinsing steps The flowchart which shows the other example of control of the dishwasher in a washing process and a rinse process The flowchart which shows the other example of control of the dishwasher in a washing process and a rinse process

  Hereinafter, a dishwasher according to an embodiment of the present invention will be described with reference to the drawings. In the following description, a liquid used for cleaning and rinsing an object to be cleaned such as tableware is referred to as cleaning water.

(1) Configuration of Dishwasher FIGS. 1 and 2 are a front view and a side view showing a configuration of a dishwasher according to an embodiment of the present invention. In the front view of FIG. 1, a part of the front of the dishwasher 1 is cut away. Moreover, in the side view of FIG. 2, the inside of the dishwasher 1 is permeate | transmitted and illustrated.

  As shown in FIGS. 1 and 2, the dishwasher 1 includes a housing 1a. A door 16 (FIG. 2) that can be opened and closed is provided on the front surface of the housing 1a. A window portion 16 a (FIG. 2) is formed in a part of the door 16. A cleaning tank 2 for cleaning the object to be cleaned 10 such as tableware is provided in the housing 1a.

  An upper table basket 8 is provided at the upper stage of the cleaning tank 2 so as to be movable in the front-rear direction. The upper table basket 8 has a left accommodating portion 8 a provided on one side of the cleaning tank 2 and a right accommodating portion 8 b provided on the other side of the cleaning tank 2. The left accommodating portion 8a is provided at a position lower than the right accommodating portion 8b.

  A lower table basket 9 is provided at the lower part of the cleaning tank 2 so as to be movable in the front-rear direction. The lower table basket 9 has a left accommodating portion 9 a provided on one side of the cleaning tank 2 and a right accommodating portion 9 b provided on the other side of the cleaning tank 2. The left accommodating portion 9a and the right accommodating portion 9b are provided at the same height.

  Various objects to be cleaned 10 are accommodated in the left accommodating portion 8a and the right accommodating portion 8b of the upper tableware basket 8, and the left accommodating portion 9a and the right accommodating portion 9b of the lower tableware basket 9.

  A substantially cross-shaped fixed cleaning nozzle 5 is disposed on the back surface of the cleaning tank 2. The fixed cleaning nozzle 5 has a vertical nozzle portion 5a extending in the vertical direction and a horizontal nozzle portion 5b extending in the horizontal direction at a substantially central portion of the vertical nozzle portion 5a. The upper end portion of the vertical nozzle portion 5a is bent in the lateral direction toward the other side surface of the cleaning tank 2 to form a bent portion 5c. A plurality of liquid ejection ports 20a are formed in the bent portion 5c.

  Moreover, the turbidity detection part 60 is provided immediately above the upper end part of the vertical nozzle part 5a. Details of the turbidity detection unit 60 will be described later.

On one side of the cleaning tank 2, a water conduit 6 is attached so as to extend forward from the lateral nozzle portion 5 b of the fixed cleaning nozzle 5. A rotary cleaning nozzle 7 is attached to the tip of the water conduit 6 so as to be rotatable around the vertical axis. The rotary cleaning nozzle 7 has blade portions extending in one direction and in the opposite direction from the rotation center, and a plurality of liquid injection ports (not shown) are formed on the upper surfaces of the blade portions. The rotary cleaning nozzle 7 is disposed below the left accommodating portion 8 a of the upper table basket 8. In addition, a plurality of liquid injection ports 20 b are formed in the horizontal nozzle portion 5 b on the other side surface of the cleaning tank 2.

  Rotating cleaning nozzles 3 and 4 are attached to the bottom of the cleaning tank 2 so as to be rotatable around the vertical axis. Each of the rotary cleaning nozzles 3 and 4 has blade portions extending in one direction and in the opposite direction from the rotation center, like the rotary cleaning nozzle 7, and a plurality of liquid injection ports (not shown) are formed on the upper surfaces of these blade portions. ) Is formed. The rotary cleaning nozzle 3 is disposed below the left accommodating portion 9a of the lower tableware basket 9, and the rotational cleaning nozzle 4 is disposed below the right accommodating portion 9b of the lower tableware basket 9.

  As shown in FIG. 2, a reservoir 12 is formed on the front side of the washing tub 2 below the lower table basket 9 to temporarily store washing water used for washing or rinsing the article to be washed 10. .

  One end of the water supply pipe 31 is connected to the vicinity of the lower end of the back surface of the cleaning tank 2. The water supply pipe 31 extends to the outside of the housing 1a, and the other end is connected to a water pipe (not shown). A water supply valve 31 a is inserted in the water supply pipe 31 inside the housing 1 a. By opening the water supply valve 31a, tap water is introduced into the cleaning tank 2 as cleaning water. The cleaning water introduced into the cleaning tank 2 is stored in the storage unit 12.

  The reservoir 12 is provided with a heater 14 for heating the stored cleaning water and for heating the atmosphere inside the cleaning tank 2. A temperature sensor 17 is provided on the outer wall of the bottom surface of the cleaning tank 2. The temperature sensor 17 indirectly detects the temperature of the cleaning water stored in the storage unit 12 and the temperature of the atmosphere inside the cleaning tank 2 through the outer wall on the bottom surface of the cleaning tank 2.

  A drain port 12 a is formed at the bottom of the storage unit 12. A leftover filter 13 for collecting the leftovers removed from the object to be cleaned 10 is detachably mounted immediately above the drain port 12a. In the present embodiment, the leftovers refer to solid substances in the dirt removed from the object to be cleaned 10 by washing or rinsing.

  A washing water introduction / derivation portion G is formed at the lower portion of the drain port 12a. A pump 11 is connected to the cleaning water introduction / derivation section G via a pipe 11a. Thereby, the internal space of the pump 11 communicates with the internal space of the cleaning water introduction / derivation part G. The pump 11 is provided with a drain pipe 32 extending outside the housing 1a and a water diversion mechanism 15. In the present embodiment, a reversible rotary pump is used as the pump 11. The drain pipe 32 has a trap structure (not shown).

  A drying mechanism 72 is provided on the side of the pump 11. The drying mechanism 72 includes, for example, a fan and supplies gas from the back surface of the cleaning tank 2 to the inside of the cleaning tank 2 through a gas introduction pipe (not shown). Thereby, an air flow is generated in the internal space of the cleaning tank 2 in the drying process of the object to be cleaned 10 described later.

  A plurality of flow paths are connected to the water diversion mechanism 15. The plurality of flow paths will be described. FIG. 3 is a view for explaining a plurality of flow paths connected to the water diversion mechanism 15 of FIG.

As shown by a thick alternate long and short dash line in FIG. 3, the first, second, third, and fourth flow paths Ra, Rb, Rc, Rd are connected to the water diversion mechanism 15. The first flow path Ra connects the water diversion mechanism 15 and the rotary cleaning nozzle 3. The first flow path Ra is used to supply the cleaning water in the water diversion mechanism 15 to the rotary cleaning nozzle 3.

  The second flow path Rb connects the water diversion mechanism 15 and the rotary cleaning nozzle 4. The second flow path Rb is used to supply the cleaning water in the water splitting mechanism 15 to the rotary cleaning nozzle 4.

  The third flow path Rc is formed inside the fixed cleaning nozzle 5. Specifically, the third flow path Rc connects the water diversion mechanism 15 and the turbidity detection unit 60 through the vertical nozzle unit 5 a of the fixed cleaning nozzle 5. The third flow path Rc connects the water diversion mechanism 15 and the plurality of liquid ejection ports 20a through the vertical nozzle portion 5a and the bent portion 5c of the fixed cleaning nozzle 5. Further, the third flow path Rc connects the water diversion mechanism 15 and the plurality of liquid ejection ports 20b through the vertical nozzle portion 5a of the fixed cleaning nozzle 5 and the horizontal nozzle portion 5b on the other side surface of the cleaning tank 2. The third flow path Rc is used to supply the cleaning water in the water diversion mechanism 15 to the turbidity detection unit 60 and the plurality of liquid injection ports 20a and 20b of the fixed cleaning nozzle 5.

  The fourth flow path Rd is also formed inside the fixed cleaning nozzle 5. Specifically, the fourth flow path Rd includes the vertical nozzle portion 5 a of the fixed cleaning nozzle 5, the horizontal nozzle portion 5 b on one side of the cleaning tank 2, and the water distribution mechanism 15 and the rotary cleaning nozzle 7 through the water conduit 6. And connect. The fourth flow path Rd is used to supply the cleaning water in the water splitting mechanism 15 to the rotary cleaning nozzle 7.

  A valve body is provided inside the water diversion mechanism 15. In the present embodiment, the valve body selectively connects the internal space of the water diversion mechanism 15 to any one of the first to fourth flow paths Ra to Rd according to the operation of the pump 11.

  Specifically, when the valve body moves from a state where the motor of the pump 11 is stopped to a state where the motor of the pump 11 rotates in one direction, the valve body and the first to first The communication state with the four flow paths Ra to Rd is switched. Thus, when the motor of the pump 11 intermittently rotates in one direction, the first, second, third, and fourth flow paths Ra, Rb, Rc each time the pump 11 operates from the stopped state. , Rd are communicated with the internal space of the water diversion mechanism 15 in this order.

  In the dishwasher 1, when the object to be cleaned 10 is washed or rinsed, first, the water supply valve 31 a is opened, so that the cleaning water (tap water) enters the reservoir 12 from the water supply pipe 31 through the bottom surface of the cleaning tank 2. Is supplied.

  After a predetermined amount of washing water is stored in the storage unit 12, the motor of the pump 11 rotates in one direction. Accordingly, the wash water stored in the storage unit 12 is sucked by the pump 11 and is pumped to the water diversion mechanism 15. In the water diversion mechanism 15, the wash water pumped from the pump 11 is selectively supplied to any one of the first to fourth flow paths Ra to Rd by the valve body.

  When the cleaning water is supplied to the first flow path Ra, the cleaning water is sprayed from the liquid injection port of the rotary cleaning nozzle 3 toward the object 10 to be cleaned accommodated in the left accommodating portion 9a of the lower tableware basket 9. .

  When the cleaning water is supplied to the second flow path Rb, the cleaning water is sprayed from the liquid injection port of the rotary cleaning nozzle 4 toward the object to be cleaned 10 stored in the right storage portion 9b of the lower tableware basket 9. .

  When the cleaning water is supplied to the fourth flow path Rd, the cleaning water is sprayed from the liquid injection port of the rotary cleaning nozzle 7 toward the object 10 to be cleaned stored in the left storage portion 8a of the upper tableware basket 8. .

When cleaning water is ejected from the rotary cleaning nozzles 3, 4, and 7, the rotary cleaning nozzles 3, 4, and 7 rotate about the vertical axis due to a reaction force that acts on the blades as the cleaning water is injected. Thereby, the jet direction of the cleaning water from the rotary cleaning nozzle 4 to the object to be cleaned 10 continuously changes.

  When the cleaning water is supplied to the third flow path Rc, the cleaning water flows from the liquid injection ports 20a and 20b of the fixed cleaning nozzle 5 toward the object to be cleaned 10 stored in the right storage portion 8b of the upper tableware basket 8. Be injected. Moreover, washing water is supplied to the turbidity detection unit 60, and the turbidity of the washing water is detected. Details will be described later.

  In the dishwasher 1 described above, when the washing or rinsing of the object to be cleaned 10 is completed, the motor of the pump 11 rotates in the reverse direction. As a result, the cleaning water stored in the storage unit 12 and the cleaning water remaining in the water diversion mechanism 15 are sucked by the pump 11 through the drain port 12a and the cleaning water introduction / derivation unit G, and the outside of the cleaning tank 2 through the drain pipe 32. To be discharged.

(2) Outline of Operation of Dishwasher An outline of operation of the dishwasher 1 will be described. FIG. 4 is a flowchart showing an outline of the operation of the dishwasher 1.

  As shown in FIG. 4, first, the cleaning water remaining in the cleaning tank 2 is discharged, and tap water is supplied from the water supply pipe 31 into the storage unit 12 by opening the water supply valve 31a (step S1: drainage). / Water supply process).

  Next, the cleaning water is obtained by dissolving the detergent in the tap water supplied into the cleaning tank 2, and the cleaning water is pumped by the pump 11 to the first to fourth flow paths Ra to Rd. Thereby, cleaning water is jetted from the rotary cleaning nozzles 3, 4, 7 and the fixed cleaning nozzle 5 to the object to be cleaned 10, and the object to be cleaned 10 is cleaned (step S 2: cleaning process).

  In this case, the cleaning water sprayed on the article to be cleaned 10 flows into the storage unit 12 through the wall surface of the cleaning tank 2 and is stored in the storage unit 12 again. The cleaning water stored in the storage unit 12 is again pumped by the pump 11 to the first to fourth flow paths Ra to Rd, and sprayed from the nozzles 3, 4, 5, and 7 to the object to be cleaned 10. As described above, the cleaning water circulates inside the cleaning tank 2 when the object to be cleaned 10 is cleaned.

  When the cleaning of the object to be cleaned 10 is completed, the cleaning water used for cleaning the object to be cleaned 10 is discharged through the drain pipe 32 by the pump 11. And tap water is again supplied to the storage part 12 of the washing tank 2 by opening the water supply valve 31a (step S3: drainage / water supply process).

  Next, the tap water supplied into the cleaning tank 2 is pumped to the first to fourth flow paths Ra to Rd by the pump 11 as cleaning water. As a result, cleaning water is sprayed from the nozzles 3, 4, 5, and 7 to the object 10 to be cleaned, and the object 10 to be cleaned is rinsed (step S4: rinsing step).

  When rinsing of the object to be cleaned 10 is finished, the cleaning water used for rinsing is discharged through the drain pipe 32 by the pump 11. And tap water is again supplied to the storage part 12 of the washing tank 2 by opening the water supply valve 31a (step S5: drainage / water supply process).

  Next, by operating the heater 14, the tap water stored in the storage unit 12 is heated to a predetermined temperature. And the heated tap water is pumped by the pump 11 to 1st-4th flow path Ra-Rd as washing water. Thus, the cleaning water heated to a predetermined temperature is sprayed from the nozzles 3, 4, 5, and 7 to the object to be cleaned 10, and the object to be cleaned 10 is rinsed by heating (step S6: rinsing step).

  In this case, the object to be cleaned 10 can be sterilized by heat, and the drying efficiency of the object to be cleaned 10 in the subsequent drying process can be increased.

  When the heat rinsing of the article to be cleaned 10 is finished, the cleaning water used for the heat rinsing is discharged through the drain pipe 32 by the pump 11 (step S7: drainage process).

  Finally, the operation of the pump 11 is stopped and the drying mechanism 72 of FIG. 2 is operated. The drying mechanism 72 generates an air flow in the internal space of the cleaning tank 2. Thereby, the atmosphere heated to a predetermined temperature by the heater 14 circulates inside the cleaning tank 2. Thereby, the to-be-cleaned object 10 is dried (step S8: drying process). A series of operation | movement in the dishwasher 1 is complete | finished when drying of the to-be-cleaned object 10 is completed.

  Although not mentioned above, actually, the cleaning water is heated to a predetermined temperature by the heater 14 also in the cleaning process of step S2. On the other hand, in the rinsing process of step S4, the cleaning water is not heated by the heater 14. However, by adjusting the cleaning conditions, the cleaning water may be heated to a predetermined temperature by the heater 14 even in the rinsing process of step S4.

  Of the series of operations described above, the number of times of the cleaning process in step S2 and the rinsing process in steps S3 and S4 can be appropriately changed according to the turbidity of the cleaning water detected by the turbidity detection unit 60. Further, in the cleaning process and the rinsing process, the temperature of the cleaning water and the cleaning time or the rinsing time can be appropriately changed according to the turbidity of the cleaning water detected by the turbidity detection unit 60. Control of the dishwasher 1 according to the turbidity of the washing water will be described later.

(3) Details of Turbidity Detection Unit Details of the turbidity detection unit 60 will be described. 5 is an assembled perspective view of the turbidity detection unit 60 of FIG. 1, and FIG. 6 is a longitudinal sectional view of the turbidity detection unit 60 of FIG.

  As shown in FIGS. 5 and 6, the turbidity detection unit 60 mainly includes a lower cover 610, a packing 620, a sensor housing cover 630, a sensor support case 640, an upper cover 650, a printed circuit board 64 </ b> P, and an optical sensor 64. Yes.

  The lower cover 610 constitutes a part of the ceiling surface in the cleaning tank 2 of FIG. That is, the ceiling surface of the cleaning tank 2 is formed so that a part thereof protrudes downward. An opening 611 is formed at the center of the lower cover 610. Further, two screw holes 612 are formed in the lower cover 610 in the vicinity of the opening 611.

  As a material for the back surface, the side surface, the bottom surface, and the ceiling surface of the cleaning tank 2 (FIG. 1), for example, a polypropylene (PP) resin having a light shielding property is used. In addition, polypropylene (PP) resin is also used as a material of a portion excluding the window portion 16a (FIG. 2) of the door 16 constituting the front surface of the cleaning tank 2 (FIG. 1). On the other hand, polymethylpentene (PMP) resin having translucency is used as the material of the window portion 16a (FIG. 2) of the door 16. Thereby, the user of the dishwasher 1 can visually recognize the inside of the washing tub 2 from the window portion 16 a of the door 16.

  When assembling the turbidity detection unit 60, the packing 620 is attached along the inner edge of the opening 611 of the lower cover 610. In this state, the sensor housing cover 630 having a substantially ship shape is fitted into the opening 611 of the lower cover 610 via the packing 620. As a material of the sensor housing cover 630, for example, polymethylpentene (PMP) resin is used. In this case, the sensor housing cover 630 has translucency.

  A housing space 630 </ b> S for housing the sensor support case 640 is formed at the center of the sensor housing cover 630. In addition, two through holes 639 are formed in the sensor housing cover 630 in the vicinity of the housing space 630S.

  With the sensor housing cover 630 fitted into the lower cover 610, screws N are attached to the two screw holes 612 of the lower cover 610 through the two through holes 639 of the sensor housing cover 630. Thereby, the sensor housing cover 630 is securely fixed to the lower cover 610. Further, the water tightness between the sensor housing cover 630 and the lower cover 610 is ensured by the packing 620. As shown in FIG. 6, a concave portion 631 having a rectangular cross section recessed upward is formed at the center of the bottom surface of the sensor housing cover 630 that forms the housing space 630 </ b> S.

  A printed circuit board 64P and an optical sensor 64 are attached to the sensor support case 640. In the present embodiment, a transmissive optical sensor is used as the optical sensor 64. The optical sensor 64 includes a light emitting element 64a made of a light emitting diode and a light receiving element 64b made of a photodiode. The terminals of the light emitting element 64a and the light receiving element 64b are connected to the printed board 64P.

  The sensor support case 640 to which the printed circuit board 64P and the optical sensor 64 are attached is accommodated in the accommodation space 630S of the sensor accommodation cover 630. In this state, the light emitting element 64a and the light receiving element 64b supported by the sensor support case 640 face each other with the concave portion 631 of the sensor housing cover 630 interposed therebetween.

  The upper cover 650 is attached so as to press down the upper end of the sensor support case 640. Thereby, the sensor support case 640 is positioned and the sensor support case 640 is fixed to the sensor housing cover 630. Thereby, the light emitting element 64a and the light receiving element 64b are also positioned.

  The upper surface of the upper cover 650 is in contact with the ceiling surface of the housing 1 a that covers the cleaning tank 2. Thereby, each structural member of the turbidity detection part 60 is fixed reliably.

  As shown in FIG. 6, a turbidity detection nozzle 5 x extending in the vertical direction toward the turbidity detection unit 60 is attached to the upper end of the fixed cleaning nozzle 5 of FIGS. 1 to 3. A liquid injection port 20c that supplies cleaning water to the turbidity detection unit 60 is formed at the tip of the turbidity detection nozzle 5x. The internal space of the turbidity detection nozzle 5x constitutes a part of the third flow path Rc in FIG.

  The liquid ejection port 20c at the tip of the turbidity detection nozzle 5x is positioned so as to face the concave portion 631 of the sensor housing cover 630. Accordingly, when the cleaning water is supplied to the third flow path Rc, the cleaning water is continuously discharged upward from the turbidity detection nozzle 5x, so that the cleaning water is discharged into the concave portion 631. Filled. The cleaning water filled in the concave portion 631 is sequentially replaced with the cleaning water discharged from the turbidity detection nozzle 5x.

  In this state, the optical sensor 64 is driven. As described above, the sensor housing cover 630 has translucency. Therefore, the light generated by the light emitting element 64a is received by the light receiving element 64b through the side wall of the concave portion 631 of the sensor housing cover 630 and the cleaning water filled in the concave portion 631.

  Thereby, when the light emission amount of the light emitting element 64a is constant, the light reception amount of the light receiving element 64b changes according to the dirt (turbidity) of the cleaning water filled in the concave portion 631. Thereby, the turbidity of the washing water is detected based on the voltage value of the light reception signal output from the light receiving element 64b.

  When the supply of the washing water to the third flow path Rc is stopped, the washing water filled in the concave portion 631 flows down along the inner peripheral surface and the like.

(4) Features of turbidity detection unit (4-a) As described above, in the dishwasher of Patent Document 1, the water diversion means is provided below the washing tank together with the washing pump to detect the turbidity of the washing water. Detection means for attaching is attached to the water diversion means. That is, in the dishwasher of Patent Document 1, the detection means is provided below the washing tank.

  In this case, as long as the cleaning water exists in the cleaning tank, the cleaning water always exists in the water dividing means. For this reason, the inner surface of the water dividing means may become dirty over time due to water stains or the like.

  Further, when draining / supplying the washing water to the washing tank, the water level of the washing water fluctuates inside the water dividing means. Specifically, when the cleaning water is discharged from the cleaning tank, the cleaning water remaining inside the water dividing means is also discharged. As a result, the water level of the washing water descends inside the water dividing means. At this time, if the oil is floating on the liquid level of the cleaning water, the oil adheres to the inner surface of the water dividing means by lowering the level of the cleaning water.

  As a result of these, the inner surface of the water distribution means tends to become dirty due to the use of the dishwasher over time. For this reason, the detection accuracy of the turbidity of the washing water by the detection means may be reduced due to dirt generated by the water distribution means.

  (4-b) On the other hand, in the dishwasher 1 which concerns on this Embodiment, the turbidity detection part 60 is provided in the position higher than the highest water level of the wash water stored by the storage part 12. FIG.

  Thus, when the cleaning water is supplied to the channels Ra, Rb, Rd other than the third channel Rc, the turbidity detection portion (concave portion 631) of the cleaning water in the turbidity detection unit 60 is cleaned. No water contact. Further, when the washing water is discharged from the washing tank 2, no washing water remains in the turbidity detection part (concave part 631) of the washing water in the turbidity detection part 60. Furthermore, by irrigating the cleaning water from the liquid injection port 20c of the turbidity detection nozzle 5x toward the concave portion 631, leftovers and oil contained in the cleaning water attached to the surface of the concave portion 631. Thus, the dirt can be removed, and the effect of self-cleaning can be obtained. Further, when the dishwasher 1 is manufactured, the optical sensor 64 is operated to check the operation of the optical sensor 64. The optical sensor 64 is disposed on both sides of the concave portion 631 on the top surface of the washing tank 2. Therefore, since the manufacturer can insert a blank sheet or the like into the concave portion 631 to check the presence or absence of light of the optical sensor 64, the operation check at the time of manufacturing can be easily completed.

  Accordingly, it is possible to prevent water scale and oil from adhering to the concave portion 631 of the sensor housing cover 630. As a result, the detection error of the turbidity of the washing water is reduced, and the turbidity of the washing water can be accurately detected over a long period.

  Moreover, the turbidity detection part 60 is provided in the inside of the washing tank 2, and maintenance is easy. Therefore, even if the concave portion 631 is soiled, the user can easily remove the soiling.

  In the dishwasher 1, the turbidity detection unit 60 detects the turbidity of the washing water supplied to the third flow path Rc. In the washing step and the rinsing step, it is possible to accurately detect the communication state between the internal space of the water separation mechanism 15 and the third flow path Rc based on the detection result of the turbidity detection unit 60. Details will be described later.

  (4-c) As described above, in the turbidity detection unit 60, cleaning water is discharged from the turbidity detection nozzle 5x to the concave portion 631 of the sensor housing cover 630. The turbidity of the cleaning water is detected by the optical sensor 64 by filling the concave portion 631 with the cleaning water.

  Here, the concave portion 631 is arranged so that the turbidity detection nozzle 5x is arranged in the vertical direction and faces the tip of the turbidity detection nozzle 5x. Thereby, the top surface 632 of the concave portion 631 extends along the horizontal plane and faces downward. In this state, when cleaning water is discharged in the vertical direction from the turbidity detection nozzle 5x to the concave portion 631, a substantially uniform water pressure is applied to the top surface 632 of the concave portion 631. Thereby, when bubbles are mixed in the cleaning water introduced into the concave portion 631, the bubbles are uniformly pushed downward from the concave portion 631 by water pressure. Therefore, when cleaning water is continuously discharged to the concave portion 631, almost no gas phase such as bubbles remains in the concave portion 631.

  In this case, since there is no gas phase in the cleaning water introduced between the light emitting element 64a and the light receiving element 64b, the detection error of the turbidity of the cleaning water is reduced.

  When the turbidity detection nozzle 5x is arranged in the horizontal direction and the sensor housing cover 630 is arranged so that the concave portion 631 faces the tip of the turbidity detection nozzle 5x, the turbidity detection nozzle 5x causes the cleaning water to flow into the concave portion 631. Is discharged, it is difficult for the water pressure applied to the top surface 632 along the vertical direction of the concave portion 631 to be uniform due to the influence of gravity. Therefore, when bubbles are mixed in the cleaning water introduced into the concave portion 631, the bubbles may move upward and stay inside the concave portion 631.

  Therefore, the turbidity detection nozzle 5x and the sensor accommodation cover 630 are arranged such that the turbidity detection nozzle 5x is arranged in the vertical direction and the concave portion 631 faces the tip of the turbidity detection nozzle 5x. It is preferable. As a result, the turbidity detection error is reduced as described above.

  In the case where bubbles mixed in the cleaning water hardly affect the turbidity detection error, the turbidity detection nozzle 5x is disposed in the horizontal direction, and the concave portion 631 of the sensor housing cover 630 is the turbidity detection nozzle 5x. You may arrange | position so that the front-end | tip part may be opposed. Alternatively, the turbidity detection nozzle 5x may be disposed so as to be inclined with respect to the vertical direction, and the sensor housing cover 630 may be disposed such that the concave portion 631 faces the tip of the turbidity detection nozzle 5x.

  Even in this case, the turbidity detection unit 60 is provided at a position higher than the maximum water level of the cleaning water stored in the storage unit 12, so that the cleaning water flows in the channels Ra, Rb, When supplied to Rd, the washing water does not contact the concave portion 631. Further, even when the cleaning water is discharged from the cleaning tank 2, the cleaning water does not remain in the concave portion 631. Accordingly, it is possible to prevent water scale and oil from adhering to the concave portion 631 of the sensor housing cover 630.

  (4-d) As described above, the window portion 16a of the door 16 (FIG. 2) constituting the front surface of the cleaning tank 2 (FIG. 1) has translucency. Thereby, external light enters the cleaning tank 2 from the window portion 16a with the door 16 of FIG. 2 closed. In this case, there is a possibility that the detection accuracy of the optical sensor 64 may be reduced by disturbance light when detecting the turbidity of the washing water.

  On the other hand, in the turbidity detection unit 60, the concave portion 631 where the turbidity of the washing water is detected is surrounded by the lower cover 610. As described above, the lower cover 610 constitutes a part of the ceiling surface of the cleaning tank 2, and the ceiling surface has light shielding properties.

Thereby, even when external light enters the inside of the cleaning tank 2 with the door 16 closed, the light is prevented from entering the concave portion 631 inside the lower cover 610. As a result, it is possible to prevent the detection accuracy of the optical sensor 64 from being lowered due to ambient light when detecting the turbidity of the washing water.

  (4-e) When the inner surface of the concave portion 631 of the sensor housing cover 630 that receives the cleaning water has water repellency, when the discharge of the cleaning water from the turbidity detection nozzle 5x to the concave portion 631 is completed, The cleaning water tends to adhere as droplets to the inner surface. When the droplet attached to the inner surface of the concave portion 631 is dried, dirt contained in the droplet adheres unevenly on the inner surface of the concave portion 631. In this case, the turbidity detection by the optical sensor 64 becomes unstable because the inner surface of the concave portion 631 is soiled unevenly.

  Therefore, the surface of the concave portion 631 of the sensor housing cover 630 that receives the cleaning water preferably has hydrophilicity. For example, the inner surface of the concave portion 631 is covered with a hydrophilic resin.

  In this case, when discharge of the cleaning water from the turbidity detection nozzle 5x to the concave portion 631 is completed, the cleaning water is prevented from adhering to the inner surface of the concave portion 631 as a droplet. This prevents the dirt from adhering unevenly to the inner surface of the concave portion 631. As a result, every time the turbidity of the cleaning water is detected, it is possible to prevent the turbidity detection accuracy from being lowered by the droplets adhering to the concave portion 631.

(5) Control system of dishwasher Next, the control system of the dishwasher 1 which concerns on this Embodiment is demonstrated. FIG. 7 is a block diagram showing the configuration of the control system of the dishwasher 1.

  As shown in FIG. 7, the dishwasher 1 includes a control unit 70. The control unit 70 includes a CPU (Central Processing Unit) 70a, a memory 70b, and a timer 70c.

  The control unit 70 is connected to the turbidity detection unit 60, the temperature sensor 17, the water supply valve 31 a, the pump 11, the heater 14, and the drying mechanism 72.

  The control unit 70 sets the detection result (voltage value) of the turbidity of the cleaning water by the turbidity detection unit 60 and the detection result (voltage value) of the temperature of the cleaning water given from the temperature sensor 17 or the temperature in the cleaning tank 2. Based on this, the operations of the water supply valve 31a, the pump 11, the heater 14, and the drying mechanism 72 are controlled.

(6) Example of detection of turbidity of washing water In the following description, an area corresponding to the left accommodating portion 9a of the lower tableware basket 9 in the washing tank 2 of FIG. The region corresponding to the right storage portion 9b is the cleaning region B, the region corresponding to the right storage portion 8b of the upper tableware basket 8 is the cleaning region C, and the region corresponding to the left storage portion 8a of the upper tableware basket 8 is the cleaning region D. (See FIG. 3).

  In the cleaning process and the rinsing process, for example, the CPU 70a rotates the motor of the pump 11 in one direction and temporarily stops the motor of the pump 11 every 30 seconds. Accordingly, the cleaning water is sequentially supplied to the first, second, third, and fourth flow paths Ra, Rb, Rc, and Rd, and the cleaning areas A, B, C, and D are sequentially cleaned every 30 sec. Water is jetted. Therefore, in this example, the cleaning or rinsing of the object 10 to be cleaned in the cleaning areas A, B, C, and D is completed in 2 minutes.

An example of the detection result of the turbidity of the cleaning water in the cleaning process will be described. FIG. 8 is a graph showing an example of a detection result of the turbidity detection unit 60 in the cleaning process. In the graph of FIG. 8, the vertical axis indicates the detected value (voltage value) of the turbidity of the wash water by the turbidity detection unit 60, and the horizontal axis indicates time. In this example, the detection value (voltage value) by the turbidity detection unit 60 decreases as the turbidity of the cleaning water increases.

  As shown in FIG. 8, the detected value of the turbidity of the washing water is maintained substantially constant from the time point t0 to the time point t1, from the time point t2 to the time point t3, and from the time point t4 onward, and from the time point t1 to the time point t2. In the period from the time point t3 to the time point t4, the value greatly decreases and fluctuates.

  Here, in the present dishwasher 1, the washing water is supplied to the first, second, third, and fourth flow paths Ra, Rb, Rc, Rd in order as described above. Therefore, in the period when the cleaning water is not supplied to the third flow path Rc, there is no cleaning water in the concave portion 631 of FIG. Therefore, the detection value by the turbidity detection unit 60 is maintained almost constant.

  Thus, when the detection result shown in FIG. 8 is obtained, a period during which the detection value by the turbidity detection unit 60 greatly decreases (in this example, a period from time t1 to time t2 and a period from time t3 to time t4). Thus, it can be determined that the cleaning water is jetted into the cleaning region C through the third flow path Rc.

  In the above description, the detection result of the turbidity of the cleaning water in the cleaning process has been described. However, substantially the same detection result can be obtained in the rinsing process. Therefore, even in the rinsing step, it can be determined that the cleaning water is being sprayed into the cleaning region C during the period in which the detection value by the turbidity detection unit 60 is greatly reduced.

  Here, the period during which the detection value by the turbidity detection unit 60 greatly decreases can be determined, for example, by the following method. In the following description, a period in which the cleaning or rinsing of the article 10 to be cleaned in the cleaning areas A, B, C, and D is called a one-cycle period.

  First, the detected value of the turbidity of the washing water is sampled at a constant time interval during a predetermined period as one cycle period, and the average value of the detected values sampled at the end of the one cycle period is calculated.

  Then, in the next cycle period, it is determined whether or not the detected value of the turbidity of the washing water is higher than the average value Av (see the one-dot chain line in FIG. 8) calculated at the end of the immediately preceding cycle period. . Thereby, when the detected value of the turbidity of the cleaning water is equal to or higher than the average value Av, it can be determined that the cleaning water is not jetted into the cleaning region C. On the other hand, when the detected value of the turbidity of the cleaning water is lower than the average value Av, it can be determined that the cleaning water is being injected into the cleaning region C.

  By performing the sampling process, the average value calculation process, and the discrimination process for each cycle period, it is possible to detect a period in which the detection value by the turbidity detection unit 60 is greatly reduced.

(7) Control example of dishwasher Hereinafter, the control example of the dishwasher 1 in a washing | cleaning process and a rinse process is demonstrated. In the following description, as described above, a period in which the detected value of the turbidity of the washing water by the turbidity detection unit 60 greatly decreases is referred to as a fluctuation period.

(7-a) Control example 1
FIG. 9 is a flowchart showing an example of control of the dishwasher 1 in the washing process and the rinsing process.

In this example, when the cleaning process or the rinsing process is started, the CPU 70a (FIG. 7) starts detecting the turbidity of the cleaning water by the turbidity detection unit 60 (step S11). CPU
70a starts intermittent driving of the pump 11 (step S12). Here, intermittent driving of the pump 11 means that the motor of the pump 11 is rotated in one direction as described above, and the motor of the pump 11 is temporarily stopped at a certain time interval (30 sec in this example). Say.

  When the pump 11 is intermittently driven, cleaning water is sequentially supplied to the first to fourth flow paths Ra to Rd in FIG. 3, and the cleaning water is jetted sequentially to the cleaning regions A to D. When the wash water is supplied to the third flow path Rc, the detected value of the turbidity of the wash water by the turbidity detection unit 60 is greatly reduced.

  When the CPU 70a detects the above-described fluctuation period based on the detection value of the turbidity detection unit 60 (step S13), the CPU 70a stores the turbidity detection value in the fluctuation period in the memory 70b (FIG. 7) (step S14). More specifically, for example, the CPU 70a stores the detection value (the lowest voltage value) indicating the highest turbidity during the fluctuation period in the memory 70b as the detection value during the fluctuation period.

  The pump 11 is intermittently driven during a process time (cleaning time or rinsing time) set in advance for each cleaning process or rinsing process. Thereby, the supply of the wash water to each of the flow paths Ra to Rd is completed, and when the wash water is supplied to the third flow path Rc again, the turbidity detection unit 60 detects the turbidity of the wash water. The value drops again again.

  Accordingly, when the CPU 70a detects the fluctuation period again based on the detection value by the turbidity detection unit 60 (step S15), the CPU 70a stores the detection value of the turbidity in the fluctuation period in the memory 70b (FIG. 7), and The detected value is compared with the detected value stored in the previous fluctuation period (step S16). In this comparison process, the difference between the two detection values is calculated as the amount of change in turbidity.

  Then, the CPU 70a determines whether or not the calculated change amount is equal to or less than a predetermined threshold value (step S17).

  When the amount of change is equal to or less than the threshold value, the CPU 70a ends the detection of the turbidity of the cleaning water and stops the pump 11 to end the cleaning process or the rinsing process. On the other hand, if the change amount is not less than or equal to the threshold value, that is, if the change amount is greater than the threshold value, the CPU 70a returns to the process of step S15.

  Here, it is considered that the amount of change in the turbidity of the cleaning water calculated every time the supply of the cleaning water to each of the flow paths Ra to Rd changes according to the contamination of the object to be cleaned 10. That is, when the degree of contamination of the object to be cleaned 10 is large, the amount of change in turbidity of the cleaning water also increases, and when the degree of contamination of the object to be cleaned 10 is small, the amount of change in turbidity of the cleaning water. Is also expected to be smaller.

  In the above control example, when the amount of change in turbidity is greater than a predetermined threshold value, the cleaning process or the rinsing process is performed again. Thereby, the cleaning time or the rinsing time is extended according to the dirt of the object to be cleaned 10 in the cleaning tank 2, so that the object to be cleaned 10 is sufficiently and reliably cleaned.

(7-b) Control example 2
10 and 11 are flowcharts showing another example of control of the dishwasher 1 in the washing process and the rinsing process.

In this example, when the washing process or the rinsing process is started, the CPU 70a (FIG. 7) starts the timer 70c (FIG. 7) (step S20), and the turbidity of the washing water by the turbidity detection unit 60 is also measured. Detection is started (step S21), and intermittent driving of the pump 11 is started (step S22).

  Thereafter, as described above, the wash water is supplied to the third flow path Rc, so that the detected value of the turbidity of the wash water is greatly reduced. Accordingly, when the CPU 70a detects the above-described fluctuation period based on the detection value of the turbidity detection unit 60 (step S23), the CPU 70a stores the initial turbidity detection value in the fluctuation period in the memory 70b (FIG. 7). (Step S24).

  Here, when the cleaning water is supplied to the third flow path Rc, there is a possibility that the concave portion 631 in FIG. 6 is not sufficiently filled with the cleaning water. In this case, the detected value of the turbidity of the washing water becomes unstable. Therefore, in actuality, when a fluctuation period is detected, a turbidity detection value after a predetermined time (for example, about 2 seconds) has elapsed from the start of the fluctuation period is stored as the initial turbidity detection value of the fluctuation period. It is preferable to store in 70b.

  Subsequently, the CPU 70a stores the detection value (the lowest voltage value) indicating the highest turbidity during the fluctuation period in the memory 70b as the detection value during the fluctuation period (step S25).

  Then, when the fluctuation period ends (step S26), the CPU 70a compares the initial turbidity detection value of the fluctuation period with the detection value indicating the maximum turbidity during the fluctuation period (step S27). In this comparison process, the difference between the two detection values is calculated as the amount of change in turbidity.

  Next, the CPU 70a determines whether or not the calculated change amount is equal to or less than a predetermined threshold value (step S28).

  When the change amount is equal to or smaller than the threshold value, the CPU 70a determines whether or not a preset process time (cleaning time or rinsing time) has elapsed based on the time measurement result of the timer 70c (step S29).

  When the predetermined process time has elapsed, the CPU 70a ends the detection of the turbidity of the cleaning water, and stops the pump 11 to end the cleaning process or the rinsing process. On the other hand, when the predetermined process time has not elapsed, the CPU 70a returns to the process of step S23.

  If the change amount is not less than or equal to the threshold value in step S28 described above, that is, if the change amount is greater than the threshold value, the CPU 70a detects the variation period again (step S31), thereby temporarily The drive stop interval is lengthened (step S32), and the process proceeds to step S29.

  Thereby, the time which the motor of the pump 11 drives temporarily becomes long. Therefore, the cleaning water injection time to the cleaning region C is longer than the cleaning water injection time to the other cleaning regions A, B, and D. Therefore, when the object 10 to be cleaned having a high degree of contamination exists in the cleaning region C, the cleaning time or the rinsing time is extended according to the contamination of the object 10 to be cleaned. As a result, the object to be cleaned 10 in the cleaning area C is sufficiently and reliably cleaned.

(8) Effects (8-a) In the dishwasher 1, the turbidity detection unit 60 is provided at a position higher than the highest water level of the wash water stored in the storage unit 12. Thereby, the turbidity of the wash water flowing through the third flow path Rc is accurately detected over a long period of time.

  Further, by accurately detecting the turbidity of the washing water flowing through the third flow path Rc, the washing condition or the rinsing condition in the plurality of washing regions A to D can be adjusted based on the detection result. As a result, it becomes possible to perform appropriate cleaning according to the dirt of the article 10 to be cleaned.

  (8-b) Furthermore, the amount of change in the turbidity of the washing water can be calculated from one of the plurality of washing regions A to D from the detected turbidity value by the turbidity detection unit 60. Accordingly, it is possible to individually adjust the cleaning condition or the rinsing condition of one cleaning area C among the plurality of cleaning areas A to D based on the calculated change amount. As a result, appropriate and efficient cleaning can be performed according to the arrangement state of the object to be cleaned 10 in the cleaning tank 2 and the contamination of the object to be cleaned 10.

  (8-c) As described above, in the cleaning process and the rinsing process, the cleaning water is supplied to the first, second, third, and fourth flow paths Ra, Rb, Rc, Rd in order. Thereby, the washing water can be supplied to each of the flow paths Ra, Rb, Rc, Rd with the maximum capacity of the pump 11. As a result, since the cleaning water can be sprayed to the cleaning regions A to D with a sufficiently high pressure, the object 10 to be cleaned can be more efficiently cleaned.

(9) Modification (9-a) In Control Example 1 and Control Example 2, the turbidity change amount is calculated based on the turbidity detection result of the wash water detected by the turbidity detection unit 60, Although the cleaning condition or the rinsing condition is adjusted based on the change amount, the cleaning condition or the rinsing condition may be adjusted according to the degree of turbidity. For example, when the detected turbidity is high, the cleaning time or the rinsing time is adjusted to be long, and when the detected turbidity is low, the cleaning time or the rinsing time is adjusted to be short. Even in this case, it is possible to perform appropriate cleaning according to the contamination of the article 10 to be cleaned.

  (9-b) In the control example 1, the cleaning time or the rinsing time is adjusted based on the detection result of the turbidity of the cleaning water, but not limited to this, the CPU 70a determines the detection result of the turbidity of the cleaning water. The temperature of the cleaning water may be adjusted by controlling the heater 14 shown in FIG. Further, the CPU 70a may increase or decrease the number of times of the cleaning process or the rinsing process based on the detection result of the turbidity of the cleaning water. Thereby, it becomes possible to perform more appropriate cleaning according to the dirt of the article 10 to be cleaned.

  (9-c) In Control Example 2 as well, the cleaning time or the rinsing time in the cleaning region C is adjusted based on the detection result of the turbidity of the cleaning water. The temperature of the washing water may be adjusted by controlling the heater 14 in FIG. Thereby, it becomes possible to perform more appropriate cleaning according to the dirt of the article 10 to be cleaned.

  (9-d) In the control example 2, the amount of change in the turbidity of the cleaning water in the cleaning region C is calculated, and the cleaning time or the rinsing time in the cleaning region C is set based on the calculated amount of change to the other cleaning regions A. , B, and D are adjusted independently of the cleaning time or the rinsing time, but are not limited thereto.

  In addition to this, based on the detection value indicating the maximum turbidity stored in step S25 by the CPU 70a and the initial turbidity detection value in the next fluctuation detection period detected in step S23 or step S31, The cleaning time or the rinsing time in the cleaning areas A, B, and D may be adjusted. Accordingly, more appropriate and efficient cleaning can be performed according to the arrangement state of the object to be cleaned 10 in the cleaning tank 2 and the dirt of the object to be cleaned 10.

  (9-e) In the dishwasher 1 described above, one turbidity detection unit 60 corresponding to the third flow path Rc is provided. Not only this but the some turbidity detection part 60 may be provided corresponding to 1st-4th flow path Ra-Rd.

  In this case, based on the detection result of the turbidity of the cleaning water by the plurality of turbidity detection units 60, the cleaning condition or the rinsing condition can be individually adjusted for each of the cleaning regions A to D.

(10) Correspondence between each constituent element of claim and each element of the embodiment Hereinafter, an example of correspondence between each constituent element of the claim and each element of the embodiment will be described. It is not limited to.

  In the above embodiment, the rotary cleaning nozzles 3, 4, 7 and the fixed cleaning nozzle 5 are examples of cleaning means.

  As each constituent element in the claims, various other elements having configurations or functions described in the claims can be used.

  The present invention can be effectively used for a dishwasher.

DESCRIPTION OF SYMBOLS 1 Dishwasher 2 Washing tank 3, 4, 7 Rotating washing nozzle 5 Fixed washing nozzle 5x Turbidity detection nozzle 10 Object to be washed 11 Pump 12 Storage part 15 Water splitting mechanism 60 Turbidity detection part 64 Photosensor 64a Light emitting element 64b Light receiving element 70 Control part 610 Lower cover 631 Concave part 632 Top surface Av Average value Ra-Rd 1st-4th flow path

Claims (3)

A dishwasher that sprays washing water to wash an object to be cleaned,
A storage tank for storing cleaning water, and a cleaning tank for storing an object to be cleaned;
Cleaning means provided in the cleaning tank;
A cleaning pump for pumping cleaning water to the cleaning means;
A turbidity detection unit provided at a position higher than the highest water level of the wash water that can be stored in the storage unit in the cleaning tank, and
The cleaning means has a fixed cleaning nozzle provided on the inner wall back surface of the cleaning tank,
The turbidity detection unit is for detecting the turbidity of the washing water supplied from the liquid injection port of the stationary cleaning nozzle,
The turbidity detection unit is provided so as to face the liquid ejection port, and has a concave portion that receives the cleaning water discharged from the liquid ejection port, and cleaning water based on light that passes through the cleaning water in the concave portion. A dishwasher comprising: an optical sensor for detecting the turbidity of the dish. The liquid injection port is provided at a tip portion of a turbidity detection nozzle attached to the fixed cleaning nozzle, and the turbidity detection nozzle is arranged in any direction between vertically upward and horizontal. The dishwasher according to claim 1, wherein A liquid injection port of the fixed cleaning nozzle that supplies cleaning water to the turbidity detection unit is provided at an upper end portion of the fixed cleaning nozzle and provided at a distal end portion of the turbidity detection nozzle that extends toward the turbidity detection unit. A dishwasher according to claim 1 or 2, wherein: