JP6931772B2 - dishwasher - Google Patents

Description

The present invention relates to a dishwasher for washing an object to be washed such as tableware stored in a washing tank, and more particularly to a water level detecting device.

Conventionally, a dishwasher is provided with a water level detecting device for detecting the water level supplied to the washing tank. There are various water level detection methods, but a typical detection method is a pressure detection method. The pressure detection method is equipped with an air chamber that communicates with the water storage section of the cleaning tank and a pressure sensor that detects the pressure in the air chamber, and detects the pressure by changing the pressure in the air chamber according to the water level in the water storage section. (See, for example, Patent Document 1).

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

When the washing water is gradually supplied into the washing water tank 107, the washing water flows into the inside of the air trap 113 through the opening 110, the connecting pipe 111, the connecting pipe 112, and the connecting portion 114 according to the supply of the washing water. .. The pressure in the air chamber 116 increases with the inflow of the wash water into the air trap 113, and this pressure is transmitted from the tubular portion 118 and the pressure detector tube 119 to the pressure switch 120. Then, when this pressure reaches a predetermined pressure (water pressure corresponding to the water level of the washing water 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 control device. Upon receiving this water level detection signal, the control device closes the valve V1 (not shown) and stops the supply of wash water to the wash water tank 107.

As the used dirty dishes are washed in the dishwasher, various food residues attached to the dishes are washed away in the washing water, and these residues float in the washing water. In the conventional dishwasher, the washing water tank 107 is provided with an opening 110 and is communicated with the air trap 113 via the connecting pipe 111. However, there is no means for eliminating the intrusion of food residue into the opening 110. Not provided. For this reason, food residue may invade the inside through the opening 110, and if a part of the communication pipe is blocked, the amount of washing water that flows in decreases, and the washing water in the washing tank becomes predetermined. Even when the water level reaches the above water level, the pressure in the air chamber 116 does not rise, and normal pressure detection cannot be performed.

Therefore, the invention of Patent Document 1 extends from the connecting pipe 111, the connecting pipe 112, and the connecting portion 114 connected to the opening 110 formed in the washing water tank 107 to the inside of the air trap 113, and the locking portion 122 and the shaft. The cleaning member 121 including the portion 123 and the extending portion 124 is arranged so as to be able to be taken in and out. As a result, the food residue adhering to the wall surface of the connecting pipe 111 and the like and the food residue that has entered the air trap 113 through the opening 110 and the like are efficiently and surely removed, and the opening 110 and the like are removed. The clogging is surely prevented, and the water level of the washing water in the washing water tank 107 is surely detected by the pressure switch 120.

Jikkenhei 6-62971

However, in the configuration of the conventional dishwasher disclosed in Patent Document 1, the air chamber is connected to a connecting portion opened at the bottom by a connecting pipe or the like. That is, there is a problem that the cleaning water flows into the lower part of the air chamber when cleaning is performed, and water leakage occurs when the connection portion deteriorates.

The present invention solves the above-mentioned conventional problems, and provides a dishwasher in which the air chamber of the water level detection device is integrally formed in the washing tank and the washing water is suppressed from leaking even if the connection portion is deteriorated. The purpose is.

In order to achieve the above object, the dishwashing machine of the present invention has a main body, a washing tank provided in the main body for accommodating an object to be washed, a washing device for washing the object to be washed, and a washing tank in the washing tank. A water level detection device for detecting the water level of the washing water is provided, and the water level detection device has a water level detection opening in the water reservoir of the washing tank, and an air chamber provided above the water level detection opening. The air chamber includes a pressure detecting unit for detecting the pressure in the air chamber, and the air chamber is integrally molded on the bottom of the cleaning tank made of resin so that the open surface by cutting out faces upward. Is located at a position higher than the water surface of the washing water stored in the water reservoir in the washing step and the rinsing step, and the predetermined upper surface member is welded and sealed .

With this configuration, the open surface 61a to be sealed is located higher than the water surface of the washing water stored in the water reservoir 18 in the washing step and the rinsing step, and has no sealing portion on the bottom surface of the air chamber 61. With this configuration, even if the sealed portion deteriorates and a leak occurs, the washing water does not leak, only the water level detecting device does not function accurately.

In the dishwasher of the present invention, the air chamber of the water level detection device is integrally formed in the washing tank, and it is possible to prevent the washing water from leaking even if the connection portion is deteriorated.

Front external perspective view of the dishwasher according to the first embodiment of the present invention in a state where the upper door body and the lower door body are opened. Rear external perspective view of the dishwasher according to the first embodiment Front view of the dishwasher according to the first embodiment Front sectional view of a main part of the dishwasher according to the first embodiment Cross-sectional view of the side wall portion of the dishwasher according to the first embodiment in a state where the upper door body and the lower door body are closed. Side view of the dishwasher in the first embodiment with the upper door body and the lower door body opened. Top sectional view showing the configuration of the water reservoir and the drain port of the washing tank of the dishwasher according to the first embodiment. Top sectional view of the washing tank of the dishwasher according to the first embodiment, showing the configuration of the water reservoir and the drain port, in a state where the water reservoir lid is removed. AA cross-sectional perspective view of FIG. 7 showing the configuration of the water reservoir and the drain port of the washing tank of the dishwasher according to the first embodiment. An exploded perspective view of a part related to the leftover filter of the dishwasher in the first embodiment. BB sectional view of FIG. 7 showing the flow of the washing water around the leftover filter and the drain port during the washing and rinsing operation of the dishwasher in the first embodiment. FIG. 7 is a cross-sectional perspective view taken along the line CC of FIG. 7, showing the flow of the washing water around the leftover filter and the drain port during the draining operation of the dishwasher according to the first embodiment. A perspective view of the vicinity of the water level detector when the washing tank of the dishwasher according to the first embodiment is viewed from below. Perspective view of the vicinity of the water level detection device of the washing tank of the dishwasher according to the first embodiment. FIG. 14 is a perspective view showing a state in which the water level detection device and the upper surface member forming the drainage path are removed. FIG. 15 is a perspective view of a state in which the drainage port cover forming the drainage path and the circulation path is removed. Cross-sectional view of the water level detector of a conventional dishwasher

The dishwasher of the first invention detects the main body, a washing tank provided in the main body for accommodating the object to be washed, a washing device for washing the object to be washed, and the water level of the washing water in the washing tank. The water level detection device has a water level detection opening in the water reservoir of the washing tank, and the air chamber provided above the water level detection opening and the pressure in the air chamber are measured. The air chamber is integrally molded with the bottom of the cleaning tank made of resin so that the open surface by cutting out faces upward, and the open surface is sealed to form the air chamber including the pressure detection unit for detecting. It was done.

With this configuration, the open surface 61a to be sealed is located higher than the water surface of the washing water stored in the water reservoir 18 in the washing step and the rinsing step, and has no sealing portion on the bottom surface of the air chamber 61. With this configuration, even if the sealed portion deteriorates and a leak occurs, the washing water does not leak, only the water level detecting device does not function accurately.

In the second invention, in particular, in the first invention, the open surface is sealed by welding a predetermined upper surface member. With this configuration, the upper surface member 70 is securely adhered to the open surface 61a and cannot be easily removed.

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

(Embodiment 1)
FIG. 1 is a front external perspective view of the dishwasher according to the first embodiment of the present invention in a state where the upper door body and the lower door body are opened. FIG. 2 is a rear perspective perspective view of the dishwasher according to the first embodiment. FIG. 3 is a front view of the dishwasher according to the first embodiment. FIG. 4 is a front sectional view of a main part of the dishwasher according to the first embodiment. FIG. 5 is a cross-sectional view of a side wall portion of the dishwasher according to the first embodiment in a state where the upper door body and the lower door body are closed. FIG. 6 is a side view of the dishwasher according to the first embodiment in a state where the upper door body and the lower door body are opened.

As shown in FIGS. 1 to 6, a resin washing tank 2 is provided inside the main body 1 of the dishwasher. The front surface of the washing tank 2 is provided with an opening 3 through which an object to be washed 6 such as tableware is taken in and out. The upper part and the lower part of the opening 3 are configured to be opened and closed by the upper door body 4 and the lower door body 5, respectively.

A sealing member 9 made of an elastic body such as silicon rubber is attached to the front surface around the opening 3. An opening is provided by the seal member 9, the upper door body seal receiving portion (not shown) provided on the upper door body 4, and the lower door body seal receiving portion (not shown) provided on the lower door body 5. The seal portion of 3 is configured. A door-to-door sealing member 68 (not shown) is attached to the lower end of the upper door body 4, and when the upper door body 4 and the lower door body 5 are closed, the lower end portion of the upper door body 4 and the lower end portion of the upper door body 4 are attached. It is configured to ensure a sealing property between the lower door body 5 and the upper end portion.

The upper door body 4 and the lower door body 5 are rotated and opened / closed in conjunction with each other by a pair of door body opening / closing mechanisms 10 provided on the left and right outer walls of the cleaning tank 2. The upper door body 4 and the lower door body 5 are configured to be opened to a position where the inner surface thereof faces upward and is substantially horizontal below the front side of the opening 3. The upper door body 4 and the lower door body 5 are positioned so that the upper door body 4 overlaps the lower door body 5 when opened.

A door body open button 11 is provided on the front surface of the lower door body 5. A door body locking device 12 that locks the upper door body 4 and the lower door body 5 to the cleaning tank 2 in a state of being closed to the opening 3 is provided on the outer wall of the cleaning tank 2. When the user pushes the door body open button 11, the door body lock device 12 is unlocked, the lower door body 5 is slightly rotated around the lower end portion, and the upper end portion is about to be hooked by the user's finger. It is configured to open forward. The method of opening the upper door body 4 and the lower door body 5 may be a method in which the upper door body 4 and the lower door body 5 are automatically opened to the opened state by the urging force in the opening direction.

An operation display unit 13 is provided on the front surface of the lower door body 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 about the operation with the control unit. The control unit controls the washing process, the rinsing process, and the drying process, and executes the cleaning operation of the object to be cleaned 6. The user operates the operation display unit 13 to select a driving course and input conditions such as cleaning, rinsing, and drying time and number of times. In addition, the user can confirm the selected driving course and driving status by the information displayed on the operation display unit 13.

Inside the washing tank 2, an upper tableware basket 7 and a lower tableware basket 8 in which an object to be washed 6 such as tableware is set are stored. Both the upper tableware basket 7 and the lower tableware basket 8 can be individually moved in the front-rear direction by the upper tableware basket guide rail 71 and the lower tableware basket guide rail 81 provided on the left and right inner side surfaces 2a and 2b of the washing tank 2. Is supported by. The upper tableware basket 7 and the lower tableware basket 8 can be pulled out forward from the opening 3 on the front surface of the washing tank 2 when the upper door body 4 and the lower door body 5 are opened. Further, the upper tableware basket 7 and the lower tableware basket 8 are removable from the upper tableware basket guide rail 71 and the lower tableware basket guide rail 81, respectively.

A water supply unit for supplying washing water is provided inside the washing tank 2. The water supply unit is composed of 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. Has been done. The control unit controls the water supply valve based on the information from the water level sensor (not shown) communicating with the inside of the washing tank 2, and in the washing step and the rinsing step, a predetermined amount of washing water is supplied to the inside of the washing tank 2. Supply.

As shown in FIG. 4, a first rotary cleaning nozzle 14 and a second rotary cleaning nozzle 15 for injecting cleaning water from a plurality of injection holes provided are arranged in the lower part of the cleaning tank 2. On the back surface inside the cleaning tank 2, a fixed cleaning nozzle 16 having a substantially cross shape is arranged along the inner wall of the cleaning tank 2. The fixed cleaning nozzle 16 is formed in a flat tubular shape, and secures a wide internal space of the cleaning tank 2. The third rotary cleaning nozzle 17 is arranged on the lower left side of the upper tableware basket 7. The third rotary cleaning nozzle 17 is provided with a plurality of injection holes for injecting cleaning water on the upper surface, and injects cleaning water from directly below toward the object to be cleaned 6 housed on the left side of the upper tableware basket 7.

A third rotation communicated with a first rotary cleaning nozzle 14, a second rotary cleaning nozzle 15, a fixed cleaning nozzle 16, and a fixed cleaning nozzle 16 toward an object to be cleaned 6 housed in the cleaning tank 2. The object to be cleaned 6 is cleaned by sequentially injecting cleaning water from the cleaning nozzle 17.

As shown in FIG. 5, a drying device 30 for drying the rinsed object 6 to be cleaned 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. Since these configurations are the same as those of well-known ones, detailed description thereof will be omitted. One end of the air blowing pipe 32 of the drying device 30 communicates with a drying air outlet 2c provided in the lower right inner part of the cleaning tank 2, and the other end is close to the outside of the upper right inner end of the cleaning tank 2. It is open to the public. The fan 31 is arranged near the other end of the blower pipe 32.

With this configuration, the drying air sucked from the outside of the machine by the fan 31 is heated by the heater and then sent into the cleaning tank 2 from the drying air outlet 2c to dry the object to be cleaned 6. Moist air containing water removed from the surface of the object to be cleaned 6 is discharged to the outside of the machine from an exhaust port 33 provided on the upper surface of the main body 1. The air temperature sensor (temperature sensor 29) is installed on the outer wall at the bottom of the cleaning tank 2 near 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 drain port of the washing tank of the dishwasher according to the first embodiment. FIG. 8 is a top sectional view of a state in which the water reservoir lid and the leftover filter are removed from the state of FIG. 7. FIG. 9 is a cross-sectional perspective view taken along the line AA of FIG. FIG. 10 is an exploded perspective view of a portion related to the leftover filter of the dishwasher according to the first embodiment. FIG. 11 is a cross-sectional view taken along the line BB of FIG. FIG. 12 is a cross-sectional perspective view taken along the line CC of FIG.

At the bottom of the washing tank 2, a water reservoir 18 for storing the supplied washing water in the washing step and the rinsing step is recessed. In the water reservoir 18, an opening 18a that opens at the bottom of the washing tank 2 is formed in a horizontally long substantially rectangular shape, and is recessed substantially perpendicular to a predetermined depth from the opening 18a. The water reservoir 18 is provided in the front portion substantially at the center of the left and right sides of the cleaning tank 2.

A lower recess is provided in the substantially central portion of the water reservoir 18. A drain port 19 is provided in the recess. The bottom surface of the water reservoir 18 is formed so as to gently descend toward the drain port 19.

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

A leftovers filter 23 for collecting leftovers and the like is provided at the drainage port 19. The leftover filter 23 is arranged below the lower surface of the recess 20a of the water reservoir lid 20. When the leftover filter 23 is attached to the drain port 19, the lower surface of the recess 20a is configured such that the central circular opening 20b and the upper surface of the outer edge of the first filter 51 of the leftover filter 23 are continuous. Has been done.

The water reservoir lid 20 is provided with a plurality of extremely small holes 20d in most of the flat surfaces other than the inclined surface of the recess 20a. Most of the washing water falls from the hole 20d into the water reservoir 18. The washing water that has not fallen from the hole 20d flows into the leftovers filter 23 arranged on the lower surface of the recess 20a together with the leftovers.

As shown in FIG. 9, the drainage port 19 is provided by an external drainage port 41 located at the center and a hollow annular circulation drainage port 42 provided around the drainage port 41 so as to be isolated from the external drainage port 41. It is configured. The external drainage port 41 communicates with the suction side of the drainage pump 27, and the washing water is discharged to the outside of the machine. The circulation drain port 42 communicates with the suction side of the cleaning pump 22, and the cleaning water is injected into the cleaning tank 2.

As shown in FIG. 10, the leftover filter 23 is composed of a first filter 51 forming an outer peripheral portion and a second filter 52 arranged inside the first filter 51. In the state of being attached to the drain port 19, the second filter 52 is inserted inside the first filter 51, locked and integrated, and the first filter 51 is locked and fixed to the drain port 19. Has been 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 cleaning water can flow in both directions are formed in a mesh shape.

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

In a state where the second filter 52 is inserted inside the first filter 51 and integrated, 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 cleaning water can flow in both directions. The hole 52d is set larger than the hole 51b of the first filter 51.

As shown in FIG. 11, the drain 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 hole 20d of the water reservoir lid 20 or passes through the leftover filter 23 and collects in the water reservoir 18 and the drain port 19. The washing water collected in the water reservoir 18 and the drain port 19 is sucked into the washing pump 22 and pressurized, and the water supply destination is selected by the water dividing unit (not shown), and the water is divided and sent.

The washed water that is separated and sent 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 that is communicated with the fixed washing nozzle 16. , It is injected from the injection hole of each nozzle. The sprayed washing water cleans or rinses the object 6 to be washed, and returns to the water reservoir 18 and the drain port 19 again. In this way, the washing water is circulated in the washing step or the rinsing step.

A heater 25 is internally provided in the cleaning pump 22. The circulated washing water is appropriately heated by energizing the heater 25, if necessary. 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 bulged inside the cleaning tank 2. By disposing the temperature sensor 29 inside the bulging portion 2e, the detection sensitivity of the temperature sensor 29 is improved. 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 composed of a thermistor or the like. The temperature sensor 29 also serves as an air temperature sensor that detects the temperature of the air in the cleaning tank 2 in the drying process.

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. Further, the drainage path 26 communicates with the connection port of the drainage hose 97 outside the machine. The washing water drained after the washing step and the rinsing step are completed is discharged from the drainage path 26 to the outside of the dishwasher via the drainage hose 97 by the drainage pump 27.

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. 13 to 16.

FIG. 13 is a perspective view of the vicinity of the water level detection device when the washing tank of the dishwasher according to the first embodiment is viewed from below. FIG. 14 is a perspective view of the vicinity of the water level detection device in the washing tank of the dishwasher according to the first embodiment. FIG. 15 is a perspective view showing a state in which the water level detection device and the upper surface member forming the drainage path are removed in FIG. FIG. 16 is a perspective view of the 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, in the cleaning tank 2 molded of resin, a groove of a drainage path 26 extending from the drain port 19 to the outside of the machine, a mounting portion 27a of the drainage pump 27, and the like are integrally molded at the bottom. ing. Further, among the parts constituting the water level detection device 60 for detecting the water level of the washing water in the washing tank 2, the air chamber 61, the water level detection opening 62 in which the air chamber 61 communicates with the water reservoir 18, and the inside of the air chamber 61. The connecting portion 65 of the communication pipe 64 that communicates with the pressure detecting portion 63 that detects the pressure of the above is integrally molded.

The water level detection device 60 is a pressure detection system. The water level detection device 60 includes an air chamber 61 having a water level detection opening 62 communicating with the water reservoir 18 of the cleaning tank 2, a pressure detection unit 63 for detecting the pressure in the air chamber 61, and an air chamber 61 and a pressure detection unit. Includes a communication pipe 64 that communicates with 63. With this configuration, the pressure of the air chamber 61 is changed according to the water level of the water reservoir 18, and the pressure is detected to determine the water level.

The air chamber 61 is integrally molded at the bottom of the cleaning tank 2 together with the water level detection opening 62, and is formed above the water level detection opening 62. Further, the air chamber 61 is formed at the bottom portion of the cleaning tank 2 at a position higher than the water reservoir portion 18, and is molded so that the open surface 61a by cutting out is upward. The open surface 61a is sealed by welding a top surface member 70 around the open surface 61a. As a result, when the cleaning water flows in during the operation of the cleaning process, the air chamber 61 becomes airtight. In addition, it is securely adhered by welding and cannot be easily removed. By the way, the upper surface member 70 is a composite part in which a flow path or the like through which cleaning water circulates is formed inside during the cleaning process.

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

Further, the circulation path 66 is provided so as to branch from the drainage path 26 at the branch portion 67. The circulation path 66 is formed with a relatively narrow width so as to make a U-turn of 180 degrees at the branch portion 67. Then, it communicates with the drainage path 26 on the upstream side of the branch portion 67. The wash water flows through the circulation path 66 as indicated by an arrow F, and joins the drainage path 26 upstream of the branch portion 67 and upstream of the wash pump 27 (pump chamber 27b).

The drainage port 19 is provided with a drainage port cover 19a. In the drainage port cover 19a, the drainage path cover 19b forming the drainage path 26 and the circulation path cover 19c forming the circulation path 66 are integrally formed. The drainage path cover 19b is upstream from the drainage pump 27 and constitutes the upper surface of the drainage path 26 from the drainage port 19 to the suction port 27c of the drainage pump 27. The circulation path cover 19c constitutes the 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 one in which the open surface 61a of the air chamber 61 is sealed. NS.

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

In the present embodiment, the open surface 61a of the air chamber 61 is formed upward, but as a molding method, the open surface may be formed downward. In this case, the bottom surface of the air chamber 61 is sealed, but in the cleaning step and the rinsing step, the cleaning water is collected in the sealed portion. If this sealing part deteriorates due to aging and leaks occur, not only will it not function correctly as a water level detector, but also the cleaning water will leak, resulting in double spillage. It becomes a malfunction.

In the configuration of the present embodiment, the open surface 61a to be sealed is located higher than the water surface of the washing water stored in the water reservoir 18 in the cleaning step and the rinsing step, and the sealing portion is provided on the bottom surface of the air chamber 61. I don't have it. With this configuration, even if the sealed portion deteriorates and a leak occurs, the washing water does not leak, only the water level detecting device does not function accurately.

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

The user pushes the door body open button 11 of the lower door body 5. Next, when the user puts his / her hand on the upper end of the lower door body 5 and pulls it forward and downward, the upper door body 4 and the lower door body 5 are in a state where the upper door body 4 is overlapped on the lower door body 5. , It is opened to a substantially horizontal state, and the opening 3 on the front surface of the cleaning tank 2 is opened forward.

The user pulls out the lower tableware basket 8 forward from the opening 3 of the opened washing tank 2, and sets the object to be washed 6 to be washed in the lower tableware basket 8. When the setting of the object to be cleaned 6 is completed in the lower tableware basket 8, the user pushes the lower tableware basket 8 into the washing tank 2 and accommodates the lower tableware basket 8.

Next, the user pulls out the upper tableware basket 7 forward and sets the object to be washed 6 to be washed in the upper tableware basket 7. When the setting of the object to be cleaned 6 is completed in the upper tableware basket 7, the user pushes the upper tableware basket 7 into the washing tank 2 and accommodates the upper tableware basket 7.

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

First, the water supply valve operates to supply a predetermined amount of washing water into the washing tank 2. When the water supply valve is stopped and the water supply is finished, the cleaning pump 22 is driven. The cleaning water is heated by the heater 25, pressurized by the cleaning pump 22, and 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 from the water diversion unit. Water is selectively divided and sent to the third rotary cleaning nozzle 17.

The water diversion unit includes, for example, a first rotary cleaning nozzle 14, a first rotary cleaning nozzle 14, a second rotary cleaning nozzle 15, a second rotary cleaning nozzle 15, a fixed cleaning nozzle 16, and a third unit communicating with the fixed cleaning nozzle 16. It operates so as to switch the water supply of the washing water at predetermined time intervals in the order of the rotary washing nozzles 17.

The leftovers that have been sprayed with the washing water and fallen off from the object to be washed 6 are collected by the water reservoir lid 20 and the leftover 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. As a result, the washing water is always maintained at a temperature suitable for washing.

When the cleaning step for a predetermined time is completed, the cleaning water containing dirt is discharged to the outside of the machine by the drainage pump 27, and the cleaning water is newly supplied into the cleaning tank 2. The supplied cleaning water is pressurized by the cleaning pump 22, and the third rotary cleaning nozzle 17 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. Will be sent to. The supplied cleaning water is sprayed from the injection holes of each cleaning nozzle, and a rinsing step of washing away the detergent, leftovers, etc. adhering to the object to be cleaned 6 is executed.

In this rinsing step, after the rinsing operation is performed for a predetermined time, the washing water in which the detergent and leftovers are washed out from the object to be washed 6 by the rinsing operation is discharged to the outside of the machine 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, the washing water is discharged to the outside of the machine by the drainage pump 27, and the rinsing process is completed.

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

During the cleaning and rinsing operation, the cleaning water collected in the water reservoir 18 is sucked by the cleaning pump 22, and as shown in FIG. 11, it is composed of a large number of holes provided on the upper surface 47a of the circulation drain port outer shell 47. It is sucked into the washing water circulation path 21 from the washing water circulation suction port 48. The washing water circulation suction port 48 is provided in a circumferential shape on the outside of the leftover filter 23.

With this configuration, during the cleaning and rinsing operations, the cleaning water flows roughly as indicated by the arrow C. The wash water flows from the inside to the outside in the holes 51b of the first filter 51 and the holes 52d of the second filter 52.

At this time, as for the leftovers and dirt contained in the circulating washing water, the large leftovers are collected by the second filter 52, and the fine leftovers and dirt are collected by the first filter 51.

On the other hand, during the drainage operation, the washing water collected in the water reservoir 18 is sucked by the drainage pump 27, and as shown in FIG. 12, the washing water drainage suction port 45 of the external drainage port 41 is connected to the drainage path 26. Be sucked in. The washing water drainage suction port 45 is provided in a circumferential shape substantially below and inside the leftover filter 23. In the state immediately before drainage, the amount of washing water existing in the water reservoir 18 around the outer peripheral portion of the leftover filter 23 is larger than the amount of washing water existing immediately above the leftover filter 23.

With this configuration, the wash water flows substantially as indicated by the arrow D during the drainage operation. The wash water flows from the outside to the inside in the holes 51b of the first filter 51 and the holes 52d of the second filter 52. Therefore, dirt and fine leftovers adhering to the inner peripheral surface of the first filter 51 during washing and rinsing are washed off by the washing water flowing from the outside to the inside (washing water to be drained), and the washing water is drained. At the same time, it is discharged to the outside of the machine.

Next, the detailed configuration of the circulation path 66 provided together 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 27b) provided in the drainage path 26. A resistance portion 68 having a narrowed route is provided in the drainage path 26 on the downstream side of the branch portion 67. With this configuration, the flow of the washing water is obstructed by the resistance portion 68. As a result, the water pressure in the drainage path 26 near the branch portion 67 increases, and the flow of wash water from the branch portion 67 to the circulation path 66 is promoted.

Further, the discharged washing water contains a residue having a size capable of passing through the hole 52d of the second filter 52. The circulation path 66 is bent so as to make a U-turn of 180 degrees at the branch portion 67, and is formed with a relatively narrow width. With this configuration, the residue contained in the washing water goes straight and is less likely to flow into the circulation path 66. As a result, clogging of the circulation path 66 is suppressed. The direction in which the circulation path 66 bends and branches at the branch portion 67 is not limited to 180 degrees with respect to the drainage path 26, but may be 90 degrees or more.

The branched circulation path 66 is provided with a narrowing section 69 on the upstream side of the water level detection opening 62. As a result, the flow velocity of the washing water passing through the throttle portion 69 increases. Then, as shown by the arrow F, it hits the circulation path cover 19c, flows down, and passes in the vicinity of the water level detection opening 62. In this way, the washing water flows from the branch portion 67 to the upstream side of the drainage path 26 and merges.

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

The water level detection opening 62 is located at substantially the lowermost part of the water reservoir 18 and is adjacent to the drainage path 26. Therefore, if the residual residue that is washed away during drainage remains without being completely discharged, it may accumulate in the vicinity of the water level detection opening 62. When they are piled up and the water level detection opening 62 is closed, the water level detection device 60 does not operate normally.

In the present embodiment, the circulation path 66 is formed so as to pass in the vicinity of the water level detection opening 62, and when the washing water is discharged to the outside of the machine, the circulation path 66 branches from the drainage path 26 to the circulation path 66. It flows. With this configuration, the passing wash water washes away the residual residue that had accumulated in the vicinity of the water level detection opening 62. That is, the residual residue is removed without removing the residual residue with a cleaning member as in the conventional case, and the water level detection opening 62 is not blocked by the residual residue. This makes it possible to prevent the water level detection device 60 from not operating normally due to the residue.

Further, the washing water passes through the throttle portion 69 before passing near the water level detection opening 62, and the flow velocity becomes high. As a result, the residue in the vicinity of the water level detection opening 62 is more reliably washed away.

Further, since the water level detection opening 62 is provided close to the suction port 27c of the drainage pump 27, the residual residue is easily drawn into the drainage pump 27. As a result, even if the residual residue flows into the bottom of the air chamber 61, it is pulled out, and the residual residue is less likely to accumulate in the vicinity of the water level detection opening 62.

The drainage operation is performed at the end of each of the cleaning step and the rinsing step. Therefore, the washing water discharged in the washing step contains a large amount of residual residue, but in the rinsing step, the residual residue contained in the washing water is also reduced, and the vicinity of the water level detection opening 62 is washed more cleanly.

In the present embodiment, the circulation path 66 has been described as being communicated upstream of the drainage path 26, but if the circulation path 66 is configured to pass in the vicinity of the water level detection opening 62, the final communication position will be. It is not particularly limited.

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

As described above, the dishwasher in the present embodiment detects the water level of the main body 1, the washing tank 2 provided in the main body 1 and accommodating the object to be washed 6 such as dishes, and the washing water in the washing tank 2. The water level detection device 60 is provided with a water level detection device 60, which has a water level detection opening 62 in the water reservoir 18 of the washing tank 2, and has an air chamber 61 provided above the water level detection opening 62 and an air chamber. The air chamber 61 includes a pressure detecting unit 63 for detecting the pressure inside the 61, and the air chamber 61 is integrally molded on the bottom of the cleaning tank 2 made of resin so that the open surface 61a by cutting out faces upward. 61a is sealed and formed.

With this configuration, the open surface 61a to be sealed is located higher than the water surface of the washing water stored in the water reservoir 18 in the washing step and the rinsing step, and has no sealing portion on the bottom surface of the air chamber 61. With this configuration, even if the sealed portion deteriorates and a leak occurs, the washing water does not leak, only the water level detecting device does not function accurately.

Further, the open surface 61a is sealed by welding the upper surface member 70. With this configuration, the upper surface member 70 is securely adhered to the open surface 61a and cannot be easily removed.

As described above, in the dishwasher according to the present invention, the air chamber of the water level detection device is integrally formed in the washing tank, and even if the connection portion is deteriorated, the washing water is prevented from leaking, so that the worktop of the kitchen It is useful as a household dishwasher, etc., which is used by placing it on the kitchen or by building it in the system kitchen.

1 Main body 2 Cleaning tank 3 Opening 4 Upper door body (door body)
5 Lower door body 6 Items to be cleaned 7 Upper tableware basket 8 Lower tableware basket 14 First rotary cleaning nozzle (cleaning device)
15 Second rotary cleaning nozzle (cleaning device)
16 Fixed cleaning nozzle (cleaning device)
17 Third rotary cleaning nozzle (cleaning device)
17a Rotating cleaning nozzle headrace 18 Water reservoir 19 Drainage port 20 Water reservoir lid 21 Washing water circulation path 22 Washing pump 23 Leftover filter 25 Heater 26 Drainage path 27 Drainage pump 29 Temperature sensor 30 Drying device 41 External drainage port 42 Circulation drainage port 45 Washing water drainage suction port 48 Washing water circulation suction port 51 First filter 52 Second filter 60 Water level detector 61 Air chamber 61a Open surface 63 Pressure detector 66 Circulation path 70 Top member

Claims (1)

With the main body
A cleaning tank provided in the main body and accommodating an object to be cleaned,
A cleaning device for cleaning the object to be cleaned and
It is equipped with a water level detection device that detects the water level of the washing water in the washing tank.
The water level detection device has a water level detection opening in the water reservoir of the washing tank, and includes an air chamber provided above the water level detection opening and a pressure detection unit that detects the pressure in the air chamber. ,
The air chamber is integrally molded on the bottom of the cleaning tank made of resin so that the open surface by cutting out is in the upper position.
The open surface is a dishwasher in which a predetermined upper surface member is welded and sealed, and is located at a position higher than the water surface of the washing water stored in the water reservoir in the washing step and the rinsing step.

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