JP2019080718A - dishwasher - Google Patents

Abstract

To provide a dishwasher capable of inhibiting an opening of a water level detection device from being closed by remaining food, and suppressing occurrence of a malfunction.SOLUTION: A dishwasher includes a body 1, a washing tank 2 provided in the body 1 for housing an object 6 to be washed, a water level detection device 60 for detecting a water level of washing water in the washing tank 2, an exhaust port 19 provided at a bottom of the washing tank 2, a drainage pump 27, a drain passage 26 where the drainage pump 27 is provided, and a circulation route 66 branched from the drain passage 26, and communicating with the drain passage 26 at an upstream side of a branching part 67. The water level detection device 60 has a water level detection opening 62 at a water reservoir part 18 of the washing tank 2, and includes an air chamber 61 provided upward from the water level detection opening 62 and a pressure detection part 63 for detecting a pressure in the air chamber 61. The circulation route 66 is configured so that, when the washing water is discharged to the outside, the washing water that is branched from the drain passage 26 to the circulation route 66 passes through the vicinity of the water level detection opening 62.SELECTED DRAWING: Figure 16

Description

  The present invention relates to a dishwasher for cleaning an object to be cleaned such as dishes stored in a cleaning tank, and more particularly to a water level detection device.

  Conventionally, the dishwasher is provided with a water level detection device to detect the water level supplied to the washing tank. There are various water level detection methods, but as a representative detection method, there is a pressure detection method. The pressure detection method includes an air chamber communicating with the water storage portion of the cleaning tank, and a pressure sensor for detecting the pressure in the air chamber, so that the pressure in the air chamber changes according to the water level in the water storage portion and detects the pressure Then, the water level is determined (see, for example, Patent Document 1).

  FIG. 17 is a cross-sectional view of the water level detection device in the dishwasher as described in Patent Document 1. As shown in FIG. As shown in FIG. 17, an opening 110 is formed at the upper side position of the communication portion between the flush water tank 107 and the flush pump P1 (not shown) on the right side wall of the flush water tank 107. The connecting pipe 111 is connected to the opening 110. In addition, the connection portion 114 of the air trap 113 is in communication with the connection pipe 111 via the connection pipe 112 therebetween. The air trap 113 is divided into two chambers of an air chamber 116 and a communicating chamber 117 whose upper end is opened to the atmosphere side by the partition wall 115 and communicated. Further, on the upper wall of the air chamber 116, a tubular portion 118 which is in communication with the air chamber 116 and extends upward is provided. A pressure switch 120 is connected to the tubular portion 118 via a pressure detection pipe 119.

  When the wash water is gradually supplied into the wash water tank 107, the wash water flows into the air trap 113 through the opening 110, the connection pipe 111, the connection pipe 112, and the connection portion 114 according to the supply of the wash water. . As the washing water flows into the air trap 113, the pressure in the air chamber 116 increases, and this pressure is transmitted from the tubular portion 118 and the pressure detection pipe 119 to the pressure switch 120. Then, when this pressure reaches a predetermined pressure (water pressure corresponding to the water level in the washing water tank 107), the pressure switch 120 is turned on to detect the water level of the washing water in the washing water tank 107, and the water level detection signal Is output to the controller. In response to the water level detection signal, the controller closes the valve V1 (not shown) and stops the supply of the flush water to the flush water tank 107.

  In a warewashing machine, as washing of used dirty dishes is carried out, various food leftovers attached to the dishes are washed away into the wash water, and these residues float in the wash water. In the conventional dishwasher, the washing water tank 107 is provided with the opening 110 and is communicated with the air trap 113 through the connecting pipe 111, but the means for eliminating any intrusion of food residue in the opening 110 is Not provided. For this reason, the residue of food may intrude into the inside through the opening 110, and if a part of the communication pipe is blocked, the amount of flush water flowing in decreases, and the flush water in the flush tank becomes predetermined. Even if the water level is reached, the pressure in the air chamber 116 will not rise and normal pressure detection will not be possible.

  Therefore, according to the invention of Patent Document 1, the connecting portion 111 connected to the opening 110 formed in the washing water tank 107, the connecting portion 112, the connecting portion 114, the locking portion 122, the shaft extending from the inside to the air trap 113. The cleaning member 121 including the portion 123 and the extension portion 124 is disposed so as to be able to be taken in and out. As a result, the food residue attached to the wall surface of the connection tube 111 etc. and the food residue entering the air trap 113 through the opening 110 etc. can be removed efficiently and reliably, and the opening 110 etc. Clogging is reliably prevented, and the pressure switch 120 reliably detects the level of the flush water in the flush water tank 107.

Japanese Utility Model Publication 6-62971

  However, in the configuration of the conventional dish washer disclosed in Patent Document 1 described above, the leftover of food that has been attached to the wall surface of the connecting pipe or the like, the leftover of the food that has entered the air trap through the opening, etc. The person must remove it by putting in and out the cleaning member. That is, every time the user uses the dishwasher, or checks the contamination status of the water level detection device, the user has to carry out the removal operation according to the contamination status, which has a problem that it takes time and effort. The

  The present invention solves the above-mentioned conventional problems, and whenever drainage is performed, a part of the drainage washes away the residue adhering to the vicinity of the opening of the water level detection device, preventing the opening from being blocked by the residue. It is an object of the present invention to provide a dishwasher in which the occurrence of problems in the water level detection device is suppressed.

  In order to achieve the above object, the dishwasher of the present invention has a main body, a cleaning tank provided in the main body and containing an object to be cleaned, a cleaning device for cleaning the object to be cleaned, and the inside of the cleaning tank. A water level detection device for detecting the water level of washing water, a drainage port provided at the bottom of the washing tank, a drainage pump for discharging washing water to the outside, and the drainage port and the machine in communication with each other The water level detection device includes a drainage path provided with a pump and a circulation path branched from the drainage path and communicated to a predetermined position on the upstream side of the branching portion, and the water level detection device detects the water level in the water reservoir portion of the cleaning tank. The air flow path includes an air chamber having an opening and provided above the water level detection opening, and a pressure detection unit for detecting the pressure in the air chamber, and the circulation path discharges washing water to the outside of the machine When the water flows from the drainage path to the circulation path Water, in which is configured to pass through the vicinity of the water level detection opening.

  With this configuration, the passing wash water is used to wash away debris that has accumulated near the water level detection opening. That is, even if the cleaning member does not remove the debris as in the prior art, the debris is removed and the water level detection opening is not blocked by the debris. This can prevent the water level detection device from operating normally due to debris.

  ADVANTAGE OF THE INVENTION The dishwasher of this invention can prevent that the opening of a water level detection apparatus is obstruct | occluded by a residue, and can suppress that a malfunction generate | occur | produces.

The front appearance perspective view in the state where the upper door of a dishwasher and the lower door were opened in Embodiment 1 of the present invention Rear appearance perspective view of the dishwasher in the first embodiment Front view of the dishwasher in the first embodiment Principal part front sectional view of the dishwasher in the first embodiment Side wall sectional view in a state where the upper door and the lower door of the dishwasher in the first embodiment are closed. Side view of the state in which the upper door and the lower door of the dishwasher in the first embodiment are opened Top sectional view showing the configuration of the water reservoir and the drainage port of the washing tank of the dishwasher in the first embodiment. The top sectional view in the state where the basin lid was removed, showing the configuration of the water reservoir and the drainage port of the washing tank of the dishwasher in the first embodiment. 7. The A-A cross-sectional perspective view of FIG. 7 which shows the structure of the water storage part and drain port of the washing tank of the dishwasher in Embodiment 1 of this invention. An exploded perspective view of a portion relating to the filter of the remnant of the dishwasher in the first embodiment BB cross-sectional view of FIG. 7 showing the flow of washing water around the waste food filter and the outlet during washing and rinsing operations of the dishwasher in the first embodiment. 7. CC filter cross-section perspective view of FIG. 7 which shows the flow of the refuse filter and drain water around the drainage port at the time of the drainage operation of the dishwasher in this Embodiment 1. The perspective view of the water level detection apparatus vicinity which looked at the washing tank of the dishwasher in this Embodiment 1 from the downward direction The perspective view of the water level detection device vicinity of the washing tank of the dishwasher in this Embodiment 1. The perspective view of the state which removed the upper surface member which forms a water level detection apparatus and a drainage path in FIG. The perspective view of the state which removed the drainage port cover which forms a drainage path and a circulation path in FIG. 15 Cross section of the water level detection device of the conventional dishwasher

  A dishwasher according to a first aspect of the present invention includes a main body, a cleaning tank provided in the main body and containing an object to be cleaned, a cleaning device for cleaning the object to be cleaned, and a water level of cleaning water in the cleaning tank. Water level detection device, a drainage port provided at the bottom of the washing tank, a drainage pump for draining washing water to the outside, a drainage port for communicating the drainage port with the outside, and drainage provided with the drainage pump The water level detection device has a water level detection opening in the water reservoir of the cleaning tank, and a circulation path branched from the drainage path and communicated to a predetermined position upstream of the branch. The water flow path includes an air chamber provided above the water level detection opening and a pressure detection unit for detecting the pressure in the air chamber, and the circulation path is a drainage path when the washing water is discharged to the outside of the machine. The wash water that branches and flows to the circulation path from the Parts are those that are configured to pass through the vicinity of.

  With this configuration, the passing wash water is used to wash away debris that has accumulated near the water level detection opening. That is, even if the cleaning member does not remove the debris as in the prior art, the debris is removed and the water level detection opening is not blocked by the debris. This can prevent the water level detection device from operating normally due to debris.

  According to a second invention, in particular, in the first invention, the circulation path is formed to branch from the drainage path at an angle of 90 degrees or more. With this configuration, the debris contained in the washing water does not go straight to the circulation path. As a result, clogging of the circulation path is suppressed.

  According to a third invention, in particular, in the first or second invention, a resistance portion is provided in the drainage path, and the circulation path is formed to branch from the drainage path upstream of the resistance portion. It is a thing. By this configuration, the flow of cleaning water is blocked at the resistance portion. As a result, the water pressure in the drainage path near the branch portion is increased, and the flow of wash water from the branch portion to the circulation path is promoted.

According to a fourth invention, in particular, in any one of the first to third inventions, the circulation path is provided with a throttling portion where the path narrows on the upstream side of the water level detection opening. With this configuration, the flow velocity of the water passing through the throttling portion rises and passes near the water level detection opening. Thus, debris remaining near the water level detection opening is more reliably washed away.

  According to a fifth invention, in particular, in any one of the first to fourth inventions, the water level detection opening is provided in the vicinity of the suction port of the drainage pump. With this configuration, even if debris flows into the bottom of the air chamber, it will be pulled out, and debris will not easily accumulate in the vicinity of the water level detection opening.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited by the embodiment.

Embodiment 1
FIG. 1 is a front appearance perspective view of a state in which the upper door and the lower door of the dishwasher in the first embodiment of the present invention are opened. FIG. 2 is a back appearance perspective view of the dishwasher in the first embodiment. FIG. 3 is a front view of the dishwasher in the first embodiment. FIG. 4 is a front cross-sectional view of the main part of the dishwasher in the first embodiment. FIG. 5 is a side cross-sectional view of the state in which the upper door and the lower door of the dishwasher in the first embodiment are closed. FIG. 6 is a side view of the state in which the upper door and the lower door of the dishwasher in the first embodiment are opened.

  As shown in FIGS. 1 to 6, a resin washing tank 2 is provided inside the main body 1 of the dishwasher. At the front of the cleaning tank 2, an opening 3 is provided for taking in and out an object to be cleaned 6 such as tableware. The upper and lower portions of the opening 3 are configured to be opened and closed by the upper door 4 and the lower door 5, respectively.

  A seal member 9 made of an elastic material such as silicone rubber is attached to the front of the periphery of the opening 3. An opening is formed by the sealing member 9, an upper door seal receiving portion (not shown) provided on the upper door 4, and a lower door seal receiving portion (not shown) provided on the lower door 5. The seal part of 3 is comprised. An inter-door seal member 68 (not shown) is attached to the lower end of the upper door 4, and when the upper door 4 and the lower door 5 are closed, the lower end of the upper door 4 and The sealability between the lower door 5 and the upper end portion of the lower door 5 is secured.

  The upper door 4 and the lower door 5 are interlocked and rotated by a pair of door opening and closing mechanisms 10 provided on the left and right outer side walls of the cleaning tank 2 to be opened and closed. The upper door 4 and the lower door 5 are configured to be opened downward to the front side of the opening 3 to a position where the inner surface is substantially horizontal and upward. The upper door 4 and the lower door 5 are positioned such that the upper door 4 overlaps the lower door 5 when the upper door 4 and the lower door 5 are opened.

  A door open button 11 is provided on the front of the lower door 5. A door lock device 12 is provided on the outer wall of the cleaning tank 2 to lock the cleaning tank 2 in a state where the upper door 4 and the lower door 5 are closed to the opening 3. When the user depresses the door open button 11, the lock of the door lock device 12 is released, the lower door 5 is slightly rotated about the lower end, and the upper end is the degree to which the user's finger is hooked It is configured to be opened forward. The upper door 4 and the lower door 5 may be opened to the open state automatically by the biasing force in the opening direction.

An operation display unit 13 is provided on the front surface of the lower door 5. The operation display unit 13 is electrically connected to a control unit (not shown) that controls the operation of the dishwasher, and exchanges information regarding the operation with the control unit. The control unit controls the washing process, the rinsing process and the drying process, and executes the washing operation of the object 6 to be cleaned. The user operates the operation display unit 13 and inputs conditions such as the time and number of times of operation course selection and washing, rinsing, and drying. Further, the user can confirm the selected driving course and driving situation by the information displayed on the operation display unit 13.

  An upper tableware basket 7 and a lower tableware basket 8 in which the objects to be cleaned 6 such as dishes are set are stored in the cleaning tank 2. The upper dish cage 7 and the lower dish cage 8 can be individually moved in the front-rear direction by upper dish cage guide rails 71 and lower dish cage guide rails 81 provided on the left and right inner side surfaces 2a and 2b of the washing tank 2, respectively. It is supported by The upper tableware cage 7 and the lower tableware cage 8 can be pulled forward from the opening 3 on the front surface of the washing tank 2 when the upper door 4 and the lower door 5 are opened. Also, the upper dish cage 7 and the lower dish cage 8 are removable from the upper dish cage guide rail 71 and the lower dish cage guide rail 81, respectively.

  A water supply unit for supplying washing water to the inside of the washing tank 2 is provided. The water supply unit includes a water supply valve (not shown) provided in the main body 1, an internal water supply pipe connecting the water supply valve and the cleaning tank 2, and a water supply hose 96 connecting the water supply valve and the tap water pipe. It is done. The control unit controls the water supply valve based on information from a water level sensor (not shown) in communication with the inside of the cleaning tank 2 and a predetermined amount of cleaning water is supplied to the inside of the cleaning tank 2 in the cleaning step and the rinsing step. Supply.

  As shown in FIG. 4, at the lower portion in the cleaning tank 2, a first rotary cleaning nozzle 14 and a second rotary cleaning nozzle 15 for jetting the cleaning water from the plurality of injection holes are disposed. On the back surface inside the cleaning tank 2, a fixed cleaning nozzle 16 having a substantially cross shape is disposed along the inner wall of the cleaning tank 2. The fixed cleaning nozzle 16 is formed in a flat cylindrical shape, and secures a wide internal space of the cleaning tank 2. The third rotary washing nozzle 17 is disposed on the lower left side of the upper tableware cage 7. The third rotary washing nozzle 17 has a plurality of injection holes for jetting washing water on its upper surface, and jets washing water from immediately below to the object to be washed 6 accommodated on the left side of the upper tableware cage 7.

  A third rotation communicated with the first rotary cleaning nozzle 14, the second rotary cleaning nozzle 15, the fixed cleaning nozzle 16, and the fixed cleaning nozzle 16 toward the object 6 stored in the cleaning tank 2. The to-be-cleaned object 6 is wash | cleaned by wash water being sequentially sprayed from the wash nozzle 17.

  As shown in FIG. 5, a drying device 30 for drying the to-be-cleaned object 6 after rinsing is provided on the outer side of the washing tank 2. The drying device 30 includes a heater (not shown), a fan 31, an air temperature sensor (temperature sensor 29), a blower pipe 32, and the like. About these composition, since it is the same as that of a well-known thing, detailed explanation is omitted. One end of the air flow pipe 32 of the drying device 30 is in communication with the drying air outlet 2 c provided at the lower right in the cleaning tank 2, and the other end approaches the outside of the upper right end of the cleaning tank 2. Let it be open. The fan 31 is disposed in the vicinity of the other end of the blower pipe 32.

  With this configuration, the drying air sucked from the outside by the fan 31 is heated by the heater and then fed into the cleaning tank 2 from the drying air outlet 2 c to dry the object 6 to be cleaned. Moist air containing moisture removed from the surface of the object to be cleaned 6 is exhausted to the outside of the machine from an exhaust port 33 provided on the upper surface of the main body 1. An air temperature sensor (temperature sensor 29) is installed on the outer wall of the bottom of the cleaning tank 2 at a position close to the drying air outlet 2c.

  The configuration of the water reservoir 18 of the washing tank 2 will be described with reference to the drawings.

  FIG. 7 is a top sectional view showing the configuration of the water reservoir and the drainage port of the washing tank of the dishwasher in the first embodiment. FIG. 8 is a top cross-sectional view of the state of FIG. 7 from which the water reservoir lid and the vegetable filter have been removed. FIG. 9 is a cross-sectional perspective view taken along the line A-A of FIG. FIG. 10 is an exploded perspective view of a portion related to the filter of the filter of the dishwasher in the first embodiment. FIG. 11 is a cross-sectional view taken along line B-B of FIG. 12 is a cross-sectional perspective view taken along the line C-C in FIG.

  At the bottom of the cleaning tank 2, a water reservoir 18 is provided in which the supplied cleaning water is stored in the cleaning process and the rinsing process. The water reservoir 18 has an opening 18a that opens at the bottom of the washing tank 2 formed in a horizontally-long, substantially rectangular shape, and is recessed from the opening 18a to a predetermined depth and approximately vertically. The water reservoir portion 18 is provided at the front of the center of the right and left of the cleaning tank 2.

  In the approximate center of the water reservoir 18, a recess lower than that is provided. A drain 19 is provided in the recess. The bottom surface of the water reservoir 18 is formed so as to be gently inclined downward toward the drainage port 19.

  A water reservoir lid 20 is detachably fitted to the opening 18 a at the top of the water reservoir 18 so as to be continuous with the bottom of the washing tank 2. The water reservoir lid 20 has an outer peripheral shape formed in a generally rectangular shape having a horizontally long shape corresponding to the opening 18 a of the water reservoir 18, and the center portion is recessed to form a recess 20 a. A circular opening 20b is provided at the center of the recess 20a. When the water reservoir lid 20 is attached to the opening 18 a of the water reservoir 18, the recess 20 a is located immediately above the drainage port 19.

  At the drainage port 19, a remnant filter 23 for collecting remnants and the like is disposed. The post filter filter 23 is disposed below the lower surface of the recess 20 a of the reservoir lid 20. Then, when the filter filter 23 is attached to the drainage port 19, the lower surface of the recess 20 a is configured such that the central circular opening 20 b and the upper surface of the outer edge portion of the first filter 51 of the filter filter 23 are continuous. It is done.

  The water reservoir lid 20 is provided with a plurality of very small holes 20d in most of the flat surface other than the inclined surface of the recess 20a. Most of the washing water falls from the holes 20 d into the water reservoir 18. The washing water which has not dropped from the hole 20d flows into the waste food filter 23 disposed on the lower surface of the recess 20a together with the residual food.

  As shown in FIG. 9, the drainage port 19 is constituted by an out-of-machine drainage port 41 located at the center and a hollow annular circulating drainage port 42 provided around the drainage port 41 so as to be isolated from the outside-port drainage port 41. It is configured. The outboard drainage port 41 communicates with the suction side of the drainage pump 27, and flush water is drained out of the machine. The circulation drainage port 42 communicates with the suction side of the washing pump 22, and washing water is jetted into the washing tank 2.

  As shown in FIG. 10, the filter used filter 23 is constituted by a first filter 51 forming an outer peripheral portion and a second filter 52 disposed inside the first filter 51. In the state of being attached to the drainage port 19, the second filter 52 is inserted into the inside of the first filter 51, locked and integrated, and the first filter 51 is latched and fixed to the drainage port 19 It is done.

  The first filter 51 is formed in a substantially cylindrical shape without a bottom. The cylindrical outer peripheral portion 51a is a metal plate such as stainless steel, and a large number of holes 51b through which washing water can flow in both directions are formed in a mesh shape.

  The second filter 52 is formed of a resin material and has a bottomed and substantially cylindrical shape. A handle 52c extending upward is formed from the upper surface of the outer peripheral portion 52b of the main body 52a formed in a substantially cylindrical shape with a bottom. When the second filter 52 is attached to and detached from the first filter 51, the user holds the handle 52c and operates the handle 52c in the vertical direction. When the first filter 51 and the second filter 52 are integrated with the drain port 19 when the first filter 51 and the second filter 52 are integrated, the handle portion 52c is operated so that the user holds it horizontally and rotates it horizontally.

  In the state where the second filter 52 is inserted into and integrated with the first filter 51, the outer surface of the outer peripheral portion 52b of the second filter 52 faces the inner surface of the outer peripheral portion 51a of the first filter 51. ing. The outer peripheral portion 52b of the main body portion 52a of the second filter 52 is provided with a large number of holes 52d through which the wash water can flow bidirectionally. The hole 52 d is set larger than the hole 51 b of the first filter 51.

  As shown in FIG. 11, the drainage port 19 communicates with the suction side of the washing pump 22 through the washing water circulation path 21. In the washing step and the rinsing step, the washing water passes through the holes 20 d of the lid of the water reservoir lid 20 or passes through the filter for fresh vegetables 23 and is collected in the water reservoir portion 18 and the drainage port 19. The washing water collected in the water reservoir 18 and the drainage port 19 is sucked into the washing pump 22 and pressurized, and a water feeding destination (not shown) is selected by the water splitting unit (not shown), and the water is fed and fed.

  The washing water to be separated and supplied is supplied to the first rotary washing nozzle 14, the second rotary washing nozzle 15, the fixed washing nozzle 16, and the third rotary washing nozzle 17 communicated with the fixed washing nozzle 16. , From the injection holes of each nozzle. The jetted cleaning water cleans or rinses the object 6 and returns to the water reservoir 18 and the drain 19 again. In this way, the washing water is circulated in the washing step or the rinsing step.

  A heater 25 is provided in the cleaning pump 22. The cleaning water to be circulated is appropriately heated as needed by energizing the heater 25. Further, a temperature sensor 29 for detecting the temperature of the washing water is installed on the outer wall of the bottom of the washing tank 2. The outer wall portion of the bottom of the cleaning tank 2 in which the temperature sensor 29 is installed is expanded to the inside of the cleaning tank 2. The detection sensitivity of the temperature sensor 29 is improved by arranging the temperature sensor 29 inside the bulging portion 2e. The control unit controls the energization of the heater 25 based on the detection information of the temperature sensor 29. The temperature sensor 29 is configured of a thermistor or the like. The temperature sensor 29 also serves as an air temperature sensor for detecting the temperature of the air in the cleaning tank 2 in the drying step.

  Further, as shown in FIG. 12, the drainage port 19 communicates with the suction side of the drainage pump 27 through the drainage path 26. Furthermore, the drainage path 26 communicates with the connection port of the drainage hose 97 outside the machine. The washing water drained after the washing and rinsing steps are completed is drained from the drainage path 26 by the drainage pump 27 to the outside of the dishwasher via the drainage hose 97.

  Next, the configurations of the drainage path 26, the circulation path 66, and the water level detection device 60 will be described with reference to FIGS.

  FIG. 13 is a perspective view of the vicinity of the water level detection device as viewed from below the cleaning tank of the dishwasher in the first embodiment. FIG. 14 is a perspective view of the vicinity of the water level detection device of the washing tank of the dishwasher in the first embodiment. FIG. 15 is a perspective view of a state in which the water level detection device and the upper surface member forming the drainage path in FIG. 14 are removed. FIG. 16 is a perspective view of a state in which the drainage port cover forming the drainage path and the circulation path in FIG. 15 is removed.

  As shown in FIGS. 13 to 16, the cleaning tank 2 molded of resin is molded integrally with the bottom of the groove of the drainage path 26 continuing from the drainage port 19 to the outside of the machine, the mounting portion 27a of the drainage pump 27 and the like. ing. Further, among the parts constituting the water level detection device 60 for detecting the water level of the cleaning water in the cleaning tank 2, the air chamber 61, the water level detection opening 62 communicating the air chamber 61 with the water reservoir 18, and the inside of the air chamber 61. The connecting portion 65 of the communication pipe 64 communicating with the pressure detecting portion 63 for detecting the pressure of the above is integrally molded.

  The water level detection device 60 is a pressure detection method. The water level detection device 60 includes an air chamber 61 having a water level detection opening 62 communicating with the water reservoir portion 18 of the washing tank 2, a pressure detection unit 63 for detecting the pressure in the air chamber 61, the air chamber 61 and the pressure detection unit And a communicating pipe 64 which communicates with the communication line 63. With this configuration, the pressure of the air chamber 61 is changed by the water level of the water reservoir 18, and the pressure is detected to determine the water level.

  The air chamber 61 is formed integrally with the water level detection opening 62 at the bottom of the cleaning tank 2 and is formed above the water level detection opening 62. Further, the air chamber 61 is formed at the bottom of the washing tank 2 at a position higher than the water reservoir 18 and is molded so that the open surface 61 a by molding is upward. The upper surface member 70 is welded and sealed around the open surface 61a. As a result, when the washing water flows in during the washing process operation, the air chamber 61 becomes airtight. Moreover, it adheres reliably by welding and it does not separate easily. Incidentally, the upper surface member 70 is a composite part in which a flow path or the like through which washing water circulates in the washing step is formed inside.

  As shown in FIG. 15 and FIG. 16, the drainage path 26 is configured at the bottom of the washing tank 2 so as to communicate with the outside from the drainage port 19. The drainage path 26 has a pump chamber 27 b of the drainage pump 27. As the drainage pump 27 is driven, the washing water flows through the drainage path 26 as indicated by the arrow E and is discharged out of the machine.

  Further, the circulation path 66 is provided to branch from the drainage path 26 at a branch portion 67. The circulation path 66 is formed to have a relatively narrow width so as to make a U-turn at the branch portion 67 by 180 degrees. And it is connected by the drainage path 26 more upstream than the branch part 67. As shown in FIG. The washing water flows through the circulation path 66 as indicated by the arrow F, and joins the drainage path 26 upstream of the branch portion 67 and upstream of the washing pump 27 (pump chamber 27b).

  The drainage port 19 is provided with a drainage port cover 19a. The drainage port cover 19 a is integrally formed with a drainage path cover 19 b constituting the drainage path 26 and a circulation path cover 19 c constituting the circulation path 66. The drainage path cover 19 b constitutes the upper surface of the drainage path 26 from the drainage port 19 to the suction port 27 c of the drainage pump 27 upstream of the drainage pump 27. The circulation path cover 19 c constitutes an upper surface immediately before the circulation path 66 joins the drainage path 26. The upper surface of the drainage path 26 downstream of the drainage pump 27 and the upper surface immediately after the branch portion 67 of the circulation path 66 are covered with the same upper surface member 70 as the open surface 61a of the air chamber 61 is sealed. Ru.

  Here, the air chamber 61 of the water level detection device 60 will be described.

  In the present embodiment, the air chamber 61 is formed with the open surface 61a at the upper side, but as a molding method, the open surface may be formed at the lower side. In this case, the bottom surface of the air chamber 61 is sealed, but in the washing step and the rinsing step, washing water is accumulated in the sealed portion. Even if this sealed part is deteriorated and leaks occur due to aging, etc., it will not only function properly as a water level detection device, but it will also leak wash water, resulting in double It becomes a defect.

  In the configuration of the present embodiment, the open surface 61 a to be sealed is positioned higher than the water surface of the cleaning water stored in the water reservoir 18 in the cleaning step and the rinsing step, and the sealing portion is formed on the bottom of the air chamber 61. Do not have. By this configuration, even if the sealed portion is degraded and a leak occurs, the flush water does not leak only because it does not function correctly as the water level detection device.

  The operation and action of the dishwasher configured as described above will be described.

  The user pushes in the door open button 11 of the lower door 5. Next, the upper door 4 and the lower door 5 are in a state in which the upper door 4 is superimposed on the lower door 5 by the user putting a hand on the upper end of the lower door 5 and pulling it forward and downward. , And the opening 3 on the front surface of the cleaning tank 2 is opened forward.

  The user pulls the lower dish basket 8 forward from the opening 3 of the washing tank 2 opened, and sets the object 6 to be cleaned in the lower dish basket 8. When the setting of the object 6 to be cleaned in the lower dish cage 8 is completed, the user pushes the lower dish cage 8 into the cleaning tank 2 and stores it.

  Next, the user pulls the upper dish cage 7 forward and sets the object 6 to be cleaned in the upper dish cage 7. When the setting of the objects 6 to be cleaned in the upper dish cage 7 is completed, the user pushes the upper dish cage 7 into the cleaning tank 2 and stores it.

  Next, the user inserts an appropriate amount of detergent from the detergent input unit 90 provided in the lower tableware basket 8 into the water reservoir 18 of the washing tank 2 and closes the upper door 4 and the lower door 5. The user turns on the power by the operation display unit 13, inputs conditions such as a driving course and time, and presses the start button. Then, the control unit starts the operation of the dishwasher, and sequentially executes the washing step, the rinsing step, and the drying step according to the input conditions.

  First, the water supply valve operates to supply a predetermined amount of cleaning water into the cleaning tank 2. When the water supply valve is stopped and the water supply is finished, the washing pump 22 is driven. The washing water is heated by the heater 25 and pressurized by the washing pump 22 so as to communicate with the first rotary washing nozzle 14, the second rotary washing nozzle 15, the fixed washing nozzle 16 and the fixed washing nozzle 16 from the water dividing portion. The water is selectively drained to the third rotary cleaning nozzle 17 and water is supplied.

  For example, the water diversion unit includes a first rotary washing nozzle 14, a first rotary washing nozzle 14 and a second rotary washing nozzle 15, a second rotary washing nozzle 15, a fixed washing nozzle 16, and a third washing unit communicated therewith. It operates so as to switch the water supply of the washing water every predetermined time in the order of the rotary washing nozzle 17.

  The remnants that are jetted out of the washing object 6 and dropped out of the object 6 to be cleaned are collected by the water reservoir lid 20 and the waste food filter 23. Further, the temperature of the washing water is detected by the temperature sensor 29, and when the temperature of the washing water exceeds a predetermined temperature, the energization of the heater 25 is stopped. Thus, the washing water is always maintained at a temperature suitable for washing.

  When the cleaning process for a predetermined time is completed, the contaminated cleaning water is discharged to the outside by the drainage pump 27, and the cleaning water is newly supplied into the cleaning tank 2. The supplied washing water is pressurized by the washing pump 22, and the third rotary washing nozzle 17 communicated with the first rotary washing nozzle 14, the second rotary washing nozzle 15, the fixed washing nozzle 16 and the fixed washing nozzle 16 Be sent to The supplied washing water is jetted from the jet holes of the washing nozzles, and a rinsing step is performed to wash away the detergent, residual vegetables and the like adhering to the object to be washed 6.

  In this rinsing process, after a rinsing operation is performed for a predetermined time, the washing water from which the detergent and the residual food have been washed out of the object to be washed 6 by the rinsing operation is discharged to the outside by the drainage pump 27. Then, new washing water is supplied into the washing tank 2 and the rinsing operation is performed again. In the standard setting, this rinsing operation is performed three times, and the washing water is drained to the outside by the drainage pump 27, and the rinsing process is completed.

  Here, the flow of the washing water around the remnant filter 23 and the drain 19 during the washing and rinsing operations will be described with reference to FIGS. 11 and 12.

  During the washing and rinsing operations, the washing water collected in the water reservoir 18 is drawn by the washing pump 22 and, as shown in FIG. 11, consists of a large number of holes provided on the upper surface 47a of the circulating discharge port shell 47. It is sucked into the wash water circulation path 21 from the wash water circulation suction port 48. The washing water circulation suction port 48 is circumferentially provided on the outer side of the remnant filter 23.

  Due to this configuration, the washing water flows generally as indicated by the arrow C during the washing and rinsing operations. Washing water flows generally from the inside to the outside in the holes 51 b of the first filter 51 and the holes 52 d of the second filter 52.

  At this time, the leftovers and stains contained in the circulating wash water are collected by the second filter 52 while the large leftovers are collected by the second filter 52, and the fines and dirt are collected by the first filter 51.

  On the other hand, at the time of drainage operation, the washing water accumulated in the water reservoir 18 is drawn by the drainage pump 27, and as shown in FIG. Be sucked. The washing water drainage suction inlet 45 is provided circumferentially on the lower side and the inner side than the remnant filter 23. In the state immediately before the drainage, the amount of washing water present in the water reservoir 18 around the outer peripheral part of the waste food filter 23 is larger than the amount of washing water present immediately above the waste food filter 23.

  Due to this configuration, the flush water flows approximately as indicated by the arrow D during drainage operation. Washing water flows generally from the outside to the inside at the holes 51 b of the first filter 51 and the holes 52 d of the second filter 52. Therefore, the dirt and fine residue adhering to the inner circumferential surface of the first filter 51 at the time of washing and rinsing are washed away by the washing water (washing water discharged) from the outside to the inside, and the washing water drained It is discharged out of the aircraft together with the

  Next, the detailed configuration of the circulation path 66 provided along with the drainage path 26 and the flow of the washing water will be described with reference to FIGS. 12, 15 and 16.

  The branch portion 67 from the drainage path 26 to the circulation path 66 is provided on the downstream side of the cleaning pump 27 (pump chamber 27 b) provided in the drainage path 26. Then, in the drainage path 26 downstream of the branch portion 67, a resistance portion 68 whose path is narrowed is provided. By this configuration, the flow of cleaning water is blocked by the resistance portion 68. As a result, the water pressure in the drainage path 26 near the branch portion 67 becomes high, and the flow of the washing water from the branch portion 67 to the circulation path 66 is promoted.

  In addition, the wash water to be discharged contains debris that can pass through the holes 52 d of the second filter 52. The circulation path 66 is bent so as to make a U-turn at a branch portion 67 by 180 degrees, and is formed to have a relatively narrow width. With this configuration, debris contained in the washing water does not flow straight into the circulation path 66. As a result, clogging of the circulation path 66 is suppressed. The direction in which the circulation path 66 is bent and branched at the branch portion 67 is not limited to 180 degrees with respect to the drainage path 26 and may be 90 degrees or more.

  The branched circulation path 66 is provided on the upstream side of the water level detection opening 62 with a narrowed portion 69 whose path is narrowed. As a result, the flow velocity of the wash water passing through the throttling portion 69 is increased. Then, as shown by the arrow F, the fluid flows down the circulation path cover 19c and passes near the water level detection opening 62. In this manner, the wash water flows from the branch portion 67 to the upstream side of the drainage path 26 and joins.

  Here, the water level detection opening 62 will be described.

  The water level detection opening 62 is located substantially at the bottom of the water reservoir 18 and adjacent to the drainage path 26. Therefore, if debris left during draining is not completely drained out, it may be accumulated near the water level detection opening 62. If it is piled up and the water level detection opening 62 is blocked, the water level detection device 60 will not operate normally.

  In the present embodiment, the circulation path 66 is formed to pass in the vicinity of the water level detection opening 62, and the washing water is branched from the drainage path 26 to the circulation path 66 when discharged outside the machine. Flow. With this configuration, the passing wash water is used to wash away debris that has accumulated near the water level detection opening 62. That is, even if the cleaning member does not remove the debris as in the prior art, the debris is removed and the water level detection opening 62 is not blocked by the debris. This can prevent the water level detection device 60 from operating normally due to debris.

  Further, the washing water passes through the throttling part 69 before passing near the water level detection opening 62, and the flow velocity becomes faster. As a result, debris remaining near the water level detection opening 62 is more reliably washed away.

  Furthermore, since the water level detection opening 62 is provided in the vicinity of the suction port 27 c of the drainage pump 27, debris can be easily drawn into the drainage pump 27. As a result, even if debris remains in the bottom of the air chamber 61, it will be pulled out, and debris will not easily accumulate in the vicinity of the water level detection opening 62.

  A drainage operation is performed at the end of each of the washing and rinsing steps. Therefore, although a large amount of debris is contained in the cleansing water discharged in the cleansing process, the debris contained in the cleansing water is also reduced in the rinsing process, and the vicinity of the water level detection opening 62 is cleaned more cleanly.

  In the present embodiment, the circulation path 66 is described as communicating with the upstream of the drainage path 26. However, if the circulation path 66 is configured to pass near the water level detection opening 62, the last communication position is It is not particularly limited.

  Once the rinsing step is complete, a drying step is performed. The drying device 30 operates, and the external air supplied into the cleaning tank 2 is heated by the heater by the built-in fan 31. Evaporation of water droplets attached to the object 6 by the effects of both blowing and heating Is done. After the drying is performed for a predetermined time, the operation of the drying device 30 is stopped and the drying process is completed. All the steps of cleaning the object 6 to be cleaned are completed, and the execution of the selected operation course is completed.

  As described above, the dishwasher according to the present embodiment detects the water level of the washing water in the washing tank 2 and the washing tank 2 which is provided in the main body 1 and the main body 1 and accommodates the washable objects 6 such as dishes. , A drainage pump 27 for draining the washing water to the outside, a drainage port 19 and the outside are connected, and a drainage pump 27 is provided. The water level detection device 60 is provided with the drainage path 26 and the circulation path 66 branched from the drainage path 26 and communicated with the drainage path 26 on the upstream side of the branch portion 67. An air chamber 61 having a water level detection opening 62 and provided above the water level detection opening 62, and a pressure detection unit 63 for detecting the pressure in the air chamber 61, and the circulation path 66 When discharged out of the machine, the drainage path 26 to the circulation path 66 Washing water flowing Toki is configured to pass through the vicinity of the water level detection opening 62.

With this configuration, the passing wash water is used to wash away debris that has accumulated near the water level detection opening 62. That is, even if the cleaning member does not remove the debris as in the prior art, the debris is removed and the water level detection opening 62 is not blocked by the debris. This can prevent the water level detection device 60 from operating normally due to debris.

  Also, the circulation path 66 is formed to branch from the drainage path 26 at an angle of 90 degrees or more. With this configuration, debris contained in the washing water does not flow straight into the circulation path 66. As a result, clogging of the circulation path 66 is suppressed.

  Further, a resistance portion 68 is provided in the drainage path 26, and the circulation path 66 is formed to branch from the drainage path 26 on the upstream side of the resistance portion 68. By this configuration, the flow of cleaning water is blocked by the resistance portion 68. As a result, the water pressure in the drainage path 26 in the vicinity of the branch portion 67 becomes high, and the flow of wash water from the branch portion 67 to the circulation path 66 is promoted.

  Further, in the circulation path 66, a throttle portion 69 whose path is narrowed upstream of the water level detection opening 62 is provided. With this configuration, the flow velocity of water passing through the throttling portion 69 rises and passes near the water level detection opening 62. Thus, debris remaining near the water level detection opening 62 is more reliably washed away.

  Further, the water level detection opening 62 is provided in proximity to the suction port 27 c of the drainage pump 27. With this configuration, even if debris flows into the bottom of the air chamber 61, it is pulled out, and debris is unlikely to be accumulated in the vicinity of the water level detection opening 62.

  As described above, in the dishwasher according to the present invention, when the washing water is discharged to the outside of the machine, the washing water which branches and flows from the drainage path to the circulation path passes near the water level detection opening. Since it is constituted and a failure occurrence of a water level detection device can be prevented, it is useful as a household dishwasher, etc. which is mounted on a work top of a kitchen or built in a system kitchen.

1 main body 2 cleaning tank 3 opening 4 upper door (door)
5 lower door body 6 to-be-cleaned object 7 upper tableware basket 8 lower tableware basket 14 first rotating cleaning nozzle (cleaning apparatus)
15 Second rotating cleaning nozzle (cleaning device)
16 Fixed cleaning nozzle (cleaning device)
17 Third rotating cleaning nozzle (cleaning device)
17a rotation cleaning nozzle water conduit 18 reservoir 19 drainage port 20 reservoir lid 21 irrigation water circulation path 22 irrigation pump 23 debris filter 25 heater 26 drainage path 27 drainage pump 27b pump chamber 27c suction port 29 temperature sensor 30 drying device 41 machine outside Drain 42 Circulating drainage port 45 Washed water drainage suction port 48 Washed water circulation suction port 51 First filter 52 Second filter 60 Water level detector 61 Air chamber 61a Open surface 62 Water level detection opening 63 Pressure detector 66 Circulation path 67 Branch portion 68 Resistance portion 69 Throttle portion 70 Top surface member

Claims (5)

Body and
A cleaning tank which is provided in the main body and accommodates the object to be cleaned;
A cleaning device for cleaning the object to be cleaned;
A water level detection device for detecting the water level of the cleaning water in the cleaning tank;
A drain provided at the bottom of the washing tank;
A drainage pump for discharging washing water to the outside of the machine,
A drainage passage communicating the drainage port with the outside of the machine and provided with the drainage pump;
And a circulation path branched from the drainage path and communicated to a predetermined position upstream of the branch portion,
The water level detection device has a water level detection opening in a water reservoir of the washing tank, and includes an air chamber provided above the water level detection opening, and a pressure detection unit for detecting the pressure in the air chamber. ,
The circulation path is configured such that when the washing water is discharged to the outside of the machine, the washing water which branches and flows from the drainage path to the circulation path passes near the water level detection opening.
dishwasher. The circulation path is formed to branch from the drainage path at an angle of 90 degrees or more.
A dishwasher according to claim 1. The drainage path is provided with a resistance portion, and the circulation path is formed to branch from the drainage path on the upstream side of the resistance portion.
A dishwasher according to claim 1 or 2. The circulation path is provided with a narrowed portion on the upstream side of the water level detection opening, the path being narrowed.
The dishwasher according to any one of claims 1 to 3. The water level detection opening is provided in the vicinity of the suction port of the drainage pump.
The dishwasher according to any one of claims 1 to 4.