JP2025041267A - Dishwashers - Google Patents

Abstract

To provide a dishwasher designed in view of conventional conditions, and having excellent residue collecting performance, washing performance and drainage performance.SOLUTION: A dishwasher comprises a filter unit 29 including a first body 61, a second body 62 and a third body 63. The first to third bodies 61 to 63 respectively include first to third filter parts 61a to 63a. The first filter part 61a has a plurality of first holes 610 formed therein. The second filter part 62a has a plurality of second holes 620 formed therein. The third filter part 63a has a plurality of third holes 630 formed therein. A gap S communicating with each of the second holes 620 and each of the third holes 630 is formed between the second filter part 62a and the third filter part 63a. The second body 62 includes a communication hole 624 formed therein, the communication hole communicating with the gap S from above and allowing wash water to flow into the gap S from above to below.SELECTED DRAWING: Figure 7

Description

The present invention relates to a dishwasher.

Patent Document 1 discloses a conventional dishwasher. This dishwasher includes a washing tank, a filter unit, a pump, a supply path, and a discharge path. A washing space and a water storage section are formed in the washing tank. The washing space is capable of storing an object to be washed and washing the object with washing water. The water storage section is located below the washing space, and stores the washing water.

The filter unit is capable of collecting residue contained in the cleaning water while circulating the cleaning water. The pump is capable of supplying the cleaning water to the cleaning space. The supply path is connected to the water storage section and circulates the cleaning water that has passed through the filter unit to the pump. The discharge path is connected to the water storage section and discharges the cleaning water that has passed through the filter unit to the outside of the cleaning tank.

Specifically, the filter unit is composed of a first body, a second body, and a third body. The first body is provided in the cleaning tank and covers the water storage section from above. The first body has a first filter section. The second body is inserted into the first body. The second body has a second filter section. The second filter section is cylindrical and extends downward from the first filter section, and cleaning water and residue can flow through it. The third body is located below the first body and has the first body placed on top of it. The third body has a third filter section. The third filter section is cylindrical and has a larger diameter than the second filter section, and covers the second filter section from the outside.

The first filter section has a plurality of first holes formed therein. The second filter section has a plurality of second holes formed therein, each of which has a larger opening area than each of the first holes. The third filter section has a plurality of third holes formed therein, each of which has a smaller opening area than each of the second holes. A gap is formed between the second filter section and the third filter section.

In this dishwasher, as the objects to be washed are washed with wash water in the washing space, food residue and other debris attached to the objects to be washed peels off from the objects to be washed. As a result, the debris is contained in the wash water. The wash water containing this debris then flows through the filter unit, i.e., the first to third bodies. At this time, in the first filter section of the first body, the wash water flows through each of the first holes, while debris larger than each of the first holes is collected by each of the first holes. In the second filter section of the second body, the wash water flows through each of the second holes, while debris larger than each of the second holes is collected by each of the second holes. The wash water and debris that have flowed through each of the second holes then flow to the outside of the second filter section toward the gaps. In the third filter section, of the cleaning water and residue that flow through the gap, the cleaning water flows through each of the third holes, while the residue that is larger than each of the third holes is captured by each of the third holes.

The wash water that has flowed through the filter unit is supplied again into the wash space by the pump via the supply path. After the objects to be washed have been washed, the wash water that has flowed through the filter unit is discharged through the drain path to the outside of the wash tank and ultimately to the outside of the dishwasher. In this way, in this dishwasher, the wash water can be filtered by the filter unit, so that the wash water supplied into the wash space by the pump and the wash water discharged to the outside of the dishwasher are less likely to contain residue.

Japanese Patent Application Publication No. 2-152431

However, in the conventional dishwasher described above, the residues collected by the third filter section adhere to the third filter section, which easily causes clogging of the third holes. As a result, in this dishwasher, the flow of wash water toward the supply path and the drainage path is easily obstructed. This reduces the circulation of wash water during the wash operation in which the items to be washed are washed, as well as during the rinse operation in which the items to be washed are rinsed, resulting in reduced washing and drainage performance in this dishwasher.

The present invention was made in consideration of the above-mentioned conventional situation, and the problem to be solved is to provide a dishwasher that has excellent residue collection performance, as well as excellent cleaning and drainage performance.

The dishwasher of the present invention includes a washing tank having a washing space in which an object to be washed can be washed with washing water and a water storage section located below the washing space and storing the washing water;
a filter unit capable of collecting residue contained in the cleaning water while circulating the cleaning water;
a pump capable of supplying the cleaning water to the cleaning space;
a supply passage communicating with the water storage section and for circulating the cleaning water that has passed through the filter unit to the pump;
a discharge passage communicating with the water storage section and discharging the cleaning water that has passed through the filter unit to the outside of the cleaning tank;
the filter unit includes a first body that is provided in the cleaning tank and covers the water storage portion from above, a second body that is inserted into the first body, and a third body that is located below the first body,
The first body has a first filter portion having a plate shape,
the second body has a cylindrical shape extending downwardly beyond the first filter portion and includes a second filter portion through which the cleaning water and the residue can flow,
the third body has a cylindrical third filter portion having a larger diameter than the second filter portion and covering the second filter portion from the outside,
The first filter section is formed with a plurality of first holes that communicate with the water storage section and allow the cleaning water to flow while collecting the residue that is larger than the first filter section;
The second filter portion is formed with a plurality of second holes each having an opening area larger than each of the first holes and capable of collecting the residue larger than the second filter portion while allowing the cleaning water to flow therethrough,
The third filter portion is formed with a plurality of third holes each having an opening area smaller than each of the second holes and capable of collecting the residue larger than the third filter portion while allowing the cleaning water to flow therethrough,
A cylindrical gap is formed between the second filter portion and the third filter portion, the gap communicating with each of the second holes and each of the third holes.
The cleaning water and the residue flowing through each of the second holes flow to the outside of the second filter portion toward the gap,
The first body, the second body or the third body is characterized in that a communication hole is formed which communicates with the gap from above and allows the cleaning water to flow from above downward within the gap.

In the dishwasher of the present invention, the filter unit has a first body, a second body, and a third body. A gap is formed between the second filter part of the second body and the third filter part of the third body, and this gap communicates with each of the second holes and each of the third holes.

In the first filter section of the first body, the cleaning water flows through each of the first holes, while residues larger than the first holes cannot pass through each of the first holes and are collected in each of the first holes. In the second filter section of the second body, among the cleaning water and residues flowing through the second filter section, the cleaning water flows through each of the second holes, while residues larger than the second holes cannot pass through each of the second holes and are collected in each of the second holes. Then, the cleaning water and residues flowing through each of the second holes flow to the outside of the second filter section toward the gap. As a result, in the third filter section of the third body, among the cleaning water and residues flowing through the gap, the cleaning water flows through each of the third holes, while residues larger than the third holes, i.e., residues smaller than the second holes and larger than the third holes, cannot pass through each of the third holes and are collected in each of the third holes. In this way, in this dishwasher, residue can be effectively collected by the first to third holes, and therefore the first to third filter sections, so residue is less likely to be contained in the wash water flowing through the supply passage and drain passage.

In addition, in this dishwasher, the first body, the second body, or the third body is formed with a communication hole, which communicates with the gap from above and allows wash water to flow from above to below within the gap. Therefore, in this dishwasher, even if residue collected in the third hole adheres to the third filter section, such residue can be suitably removed from the third filter section by wash water flowing into the gap from the communication hole. As a result, in this dishwasher, clogging of each third hole by residue is unlikely to occur, and the flow of wash water toward the water supply passage and drain passage is unlikely to be impeded.

Therefore, the dishwasher of the present invention has excellent residue collection performance, as well as excellent cleaning and drainage performance.

There may be multiple communication holes. It is preferable that each communication hole has a larger opening area than each of the first holes and each of the third holes. In this case, it is easier to ensure the flow rate of cleaning water flowing through each communication hole, so that residue can be more effectively removed from the third filter section by the cleaning water that flows into the gap from each communication hole.

It is preferable that the second body has a guide portion formed inside the second filter portion and capable of guiding the cleaning water and residue flowing through the second filter portion toward each of the second holes.

In this case, the cleaning water flowing through the second filter section can be preferably directed toward each of the second holes. Furthermore, the residue flowing through the second filter section can be preferably collected in each of the second holes and further in the third hole of the third body.

The second body and the third body may be detachable. It is preferable that the third body is located below the first body when assembled to the second body. In this case, the second filter section and the third filter section can be easily positioned by assembling the second body and the third body.

The second body may have a flange portion that is connected to the second filter portion and covers the gap from above. It is preferable that the communication hole is formed in the flange portion.

In this case, a communication hole can be easily formed in the second body. In addition, the flange portion can prevent residue from entering the gap from above.

The dishwasher of the present invention has excellent residue collection performance, as well as excellent cleaning and drainage performance.

FIG. 1 is a cross-sectional view of a dishwasher according to an embodiment of the present invention. FIG. 2 is a perspective view of the dishwasher according to the embodiment. FIG. 3 is a right side view of the washing tank of the dishwasher according to the embodiment, showing the treatment agent supply passage, the treatment agent supply device, etc. FIG. FIG. 4 is a perspective view showing a filter unit and the like of the dishwasher according to the embodiment. FIG. 5 is a cross-sectional view taken along line AA of FIG. 4, showing the filter unit, the drain pump, etc., of the dishwasher of the embodiment. FIG. 6 is a cross-sectional view taken along line BB of FIG. 4, showing the filter unit, the water reservoir case, the water supply pump, etc., of the dishwasher of the embodiment. FIG. 7 is an exploded perspective view of the filter unit of the dishwasher according to the embodiment. FIG. 8 is an enlarged cross-sectional view of the essential parts of the dishwasher of the embodiment, showing the first body, the second body and the third body of FIG. FIG. 9 is a plan view of the second body of the dishwasher according to the embodiment.

The following describes an embodiment of the present invention with reference to the drawings.

The dishwasher of the embodiment includes the housing 1, washing tank 3, lid 5, treatment agent supply device 9, treatment agent supply path 11, filter unit 29, storage tank 7, first dish basket 13, second dish basket 14, third dish basket 15, operation unit 19, and control unit 21 shown in Figs. 1 to 4. This dishwasher also includes the supply path 6, drainage path 8, water supply pump 43, and drainage pump 45 shown in Figs. 5 and 6. This dishwasher is incorporated in a system kitchen (not shown). For ease of explanation, the lid 5 and first dish basket 13 are omitted in Fig. 2, and the housing 1 and lid 5 are omitted in Fig. 3.

In this embodiment, the front-rear and up-down directions of the dishwasher are defined by the arrows shown in Figures 1 and 2. In Figure 2, the left-right direction of the dishwasher, i.e., the width direction, is defined based on the position of a user (not shown) of the dishwasher facing the front of the dishwasher, with the right side of the user being the right side of the dishwasher and the left side of the user being the left side of the dishwasher. These front-rear, up-down and left-right directions are mutually perpendicular. In Figures 3 and onwards, the front-rear, up-down and left-right directions of the dishwasher are defined in accordance with Figures 1 and 2.

As shown in Figures 1 and 2, the housing 1 has a right side panel 1a, a left side panel 1b, a front lower panel 1c, a rear lower panel 1d, a bottom panel 1e, and a housing opening 1f. The right side panel 1a and the left side panel 1b are each formed into a roughly rectangular plate shape extending in the front-to-rear and up-down directions. The right side panel 1a and the left side panel 1b are each disposed separately in the left-right direction. As a result, the right side panel 1a forms the right side surface of the housing 1, and the left side panel 1b forms the left side surface of the housing 1.

The front lower panel 1c and the rear lower panel 1d are formed in a generally rectangular plate shape extending in the vertical and horizontal directions. The front lower panel 1c and the rear lower panel 1d are attached to the right panel 1a and the left panel 1b, respectively, and are disposed between the right panel 1a and the left panel 1b. More specifically, the front lower panel 1c is disposed between the right panel 1a and the left panel 1b, and is disposed in the front lower part of the right panel 1a and the left panel 1b. Meanwhile, the rear lower panel 1d is disposed between the right panel 1a and the left panel 1b, and is disposed in the rear lower part of the right panel 1a and the left panel 1b. In other words, the front lower panel 1c and the rear lower panel 1d are disposed at a distance in the front-to-rear direction between the right panel 1a and the left panel 1b.

The bottom panel 1e is formed in a generally rectangular plate shape extending in the front-rear and left-right directions. The bottom panel 1e is located at the bottom of the housing 1 and is attached to the bottom ends of the right side panel 1a, the left side panel 1b, the front lower panel 1c, and the rear lower panel 1d. The right side panel 1a, the left side panel 1b, the front lower panel 1c, the rear lower panel 1d, and the bottom panel 1e form a storage space 10 in the lower part of the housing 1.

The housing opening 1f is formed between the right panel 1a, the left panel 1b, and the lower front panel 1c. As a result, the housing opening 1f is located above the storage space 10 and opens toward the front of the housing 1.

As shown in FIG. 2, the cleaning tank 3 has a right side wall 3a, a left side wall 3b, a rear wall 3c, an upper wall 3d, a lower wall 3e, and a tank opening 3f. The right side wall 3a forms the right side of the cleaning tank 3 and extends in the front-to-rear and up-down directions. The left side wall 3b forms the left side of the cleaning tank 3 and extends in the front-to-rear and up-down directions. The right side wall 3a and the left side wall 3b face each other in the left-to-right direction.

The rear wall 3c constitutes the rear surface of the cleaning tank 3 and extends in the left-right and up-down directions. The rear wall 3c is disposed between the right side wall 3a and the left side wall 3b, and is connected to the rear ends of the right side wall 3a and the left side wall 3b. The upper wall 3d constitutes the upper surface of the cleaning tank 3 and extends in the left-right and front-rear directions. The upper wall 3d is disposed between the right side wall 3a, the left side wall 3b, and the rear wall 3c, and is connected to the upper ends of the right side wall 3a, the left side wall 3b, and the rear wall 3c. The lower wall 3e constitutes the lower surface of the cleaning tank 3 and extends in the left-right and front-rear directions. The lower wall 3e is disposed between the right side wall 3a, the left side wall 3b, and the rear wall 3c, and is connected to the lower ends of the right side wall 3a, the left side wall 3b, and the rear wall 3c. As a result, the upper wall 3d and the lower wall 3e face each other in the up-down direction.

As shown in FIG. 1, a water storage section 23 is formed in the lower wall 3e. More specifically, the water storage section 23 is formed by recessing a portion of the lower wall 3e that is approximately in the center in the front-rear and left-right directions. Cleaning water is stored in the water storage section 23. As shown in FIG. 5 and FIG. 6, a communication port 23a is formed in the lower wall 3e in the center of the water storage section 23. The communication port 23a penetrates the lower wall 3e in the up-down direction. The communication port 23a connects to the lower part of the water storage section 23, and communicates the water storage section 23 with the outside of the cleaning tank 3 below the cleaning tank 3. Details of the cleaning water will be described later.

As shown in Figures 1 and 2, the tank opening 3f is located at the front end of the cleaning tank 3. The tank opening 3f opens toward the front of the cleaning tank 3, connecting the inside and outside of the cleaning tank 3 in the front-to-rear direction. The right side wall 3a, left side wall 3b, rear wall 3c, upper wall 3d, lower wall 3e, and tank opening 3f form the cleaning tank 3 into a roughly rectangular box shape that is open at the front.

As shown in FIG. 2, a first lower guide member 111, a first middle guide member 112, and a first upper guide member 113 are attached to the right side wall 3a. The first lower guide member 111 is attached to the lower part of the right side wall 3a. The first middle guide member 112 is attached to the right side wall 3a at a position spaced above the first lower guide member 111. The first upper guide member 113 is attached to the right side wall 3a at a position spaced above the first middle guide member 112. The first lower guide member 111, the first middle guide member 112, and the first upper guide member 113 each extend parallel to the front-rear direction along the right side wall 3a.

On the other hand, the second lower guide member 114, the second middle guide member 115, and the second upper guide member 116 are attached to the left side wall 3b. The second lower guide member 114 is attached to the left side wall 3b so as to be at the same height as the first lower guide member 111. The second middle guide member 115 is attached to the left side wall 3b so as to be at the same height as the first middle guide member 112. The second upper guide member 116 is attached to the left side wall 3b so as to be at the same height as the first upper guide member 113. In addition, the second lower guide member 114, the second middle guide member 115, and the second upper guide member 116 extend in the front-rear direction along the left side wall 3b, parallel to the first lower guide member 111, the first middle guide member 112, and the first upper guide member 113, respectively.

Thus, inside the cleaning tank 3, the first and second lower guide members 111, 114 face each other in the left-right direction, the first and second middle guide members 112, 115 face each other in the left-right direction, and the first and second upper guide members 113, 116 face each other in the left-right direction.

The cleaning tank 3 is disposed within the housing 1 by being fixed to the right panel 1a and the left panel 1b of the housing 1, and is located above the storage space 10 shown in FIG. 1. The cleaning tank 3 has a tank opening 3f located inside the housing opening 1f of the housing 1 and facing forward.

As shown in FIG. 1, the cover 5 has an outer panel 5a and an inner panel 5b. The outer panel 5a is formed of a plate material extending in the vertical and horizontal directions. A grip portion 5c is fixed to the upper part of the outer panel 5a. The inner panel 5b is fixed to the rear of the outer panel 5a.

The lid 5 is attached to the front of the housing 1 by a hinge mechanism 51 and a damper mechanism (not shown) provided in the storage space 10. This allows the lid 5 to swing in the front-rear direction around the swing axis O relative to the housing 1. The swing axis O extends linearly in the left-right direction of the housing 1.

The lid body 5 is displaced to the closed position shown by the solid line in FIG. 1 by swinging backward around the swing axis O. When the lid body 5 is displaced to the closed position, it closes the housing opening 1f and the tank opening 3f from the front. The lid body 5 displaced to the closed position forms a cleaning space 100 together with the cleaning tank 3. In other words, the cleaning space 100 is formed between the right side wall 3a, left side wall 3b, rear wall 3c, upper wall 3d, and lower wall 3e of the cleaning tank 3 and the inner panel 5b of the lid body 5. The water storage section 23 is located below the cleaning space 100 and is connected to the cleaning space 100.

Meanwhile, the lid 5 is displaced to the open position shown by the imaginary line in FIG. 1 by swinging forward around the swing axis O. When the lid 5 is displaced to the open position, it opens the housing opening 1f and the tub opening 3f forward. In this dishwasher, even if the lid 5 is displaced to the open position, the washing tub 3 does not move forward or backward relative to the housing 1, but remains positioned within the housing 1.

As shown in FIG. 3, the treatment agent supplying device 9 is attached to the lower part of the right side wall 3a of the cleaning tank 3, and is located between the right side wall 3a and the right panel 1a of the housing 1. As a result, the treatment agent supplying device 9 is located outside the cleaning tank 3, and therefore outside the cleaning space 100.

The treatment agent supply device 9 has a supply device main body 9a and a treatment agent supply port 9b. A pump (not shown) is provided inside the supply device main body 9a. The supply device main body 9a is electrically connected to the control unit 21 shown in FIG. 1.

The treatment agent supply port 9b is located rearward of the supply device main body 9a and is connected to the supply device main body 9a. The treatment agent supply port 9b is fixed to the lower part of the right side wall 3a and faces the cleaning space 100.

The treatment agent supply passage 11 has a supply passage main body 34 and a supply passage side connection part 35. The supply passage main body 34 is located between the right side wall 3a and the right side panel 1a, and extends in the vertical direction. The supply passage main body 34 allows the treatment agent to flow inside. The supply passage main body 34 also has an apparatus connection part 34a at its lower end. The supply passage main body 34 is connected to the supply device main body 9a of the treatment agent supply device 9 through the apparatus connection part 34a.

The supply path side connection part 35 is connected to the upper end of the supply path main body 34. The supply path side connection part 35 is also fixed to the right side wall 3a. As a result, the supply path side connection part 35 is connected to the supply path main body 34 and faces into the cleaning space 100.

As shown in FIG. 1, the dishwasher is also provided with a water storage case 25, a water distributor 26, a water supply duct 27, an air circulation device 28, and a locking device 50 for the washing tub 3.

As shown in Figures 5 and 6, the water storage case 25 is formed in a generally cylindrical shape with an open top and a bottom. The water storage case 25 is disposed within the storage space 10 and is located below the cleaning tank 3. The water storage case 25 is connected to the water storage section 23 from below via the communication port 23a by fixing its own top end to the bottom wall 3e. This allows cleaning water to be stored in the water storage case 25 as well as in the water storage section 23.

The lower part of the water storage case 25 is formed with a first connection port 251 shown in FIG. 5 and a second connection port 252 shown in FIG. 6. The first connection port 251 and the second connection port 252 are located at different positions in the circumferential direction of the water storage case 25.

As shown in FIG. 5, the water reservoir case 25 is formed with a connecting tube 25a. As shown in FIG. 1, the connecting tube 25a extends into the inside of the cleaning tank 3 via the water storage section 23. As shown in FIG. 5, the connecting tube 25a is formed in a cylindrical shape extending in the vertical direction, and its lower end is connected to the water distributor 26. As shown in FIG. 1 and FIG. 2, a first jet nozzle 31 is rotatably attached to the upper end of the connecting tube 25a. As a result, the first jet nozzle 31 is disposed within the cleaning space 100 and is rotatable within the cleaning space 100. The first jet nozzle 31 is formed with a plurality of jetting portions 300.

Furthermore, as shown in FIG. 5, the water storage case 25 is provided with a water supply hose 41 connected thereto and a supply passage 6. One end of the water supply hose 41 is connected to the water storage case 25. The other end of the water supply hose 41 extends outside the housing 1 and is connected to a water supply source (not shown) provided outside the dishwasher. In this way, the water supply hose 41 connects the water storage case 25 and the water supply source. The water supply hose 41 is also provided with a water supply solenoid valve (not shown).

The supply channel 6 is formed integrally with the water reservoir case 25 at a position different from the connection point between the water supply hose 41 and the water reservoir case 25, and extends from the water reservoir case 25 toward the rear right. The supply channel 6 communicates with the interior of the water reservoir case 25 through the first connection port 251. Therefore, the supply channel 6 communicates with the water storage section 23 through the water reservoir case 25. The supply channel 6 is also connected to the water supply pump 43 on the side opposite the water reservoir case 25. As a result, the supply channel 6 connects the water reservoir case 25 and the water supply pump 43.

As shown in FIG. 6, the water reservoir case 25 is provided with a drainage channel 8. The drainage channel 8 is formed integrally with the water reservoir case 25 at a location different from the connection point between the water supply hose 41 and the water reservoir case 25 and from the supply channel 6. The drainage channel 8 is connected to the inside of the water reservoir case 25 through the second connection port 252. Therefore, the supply channel 6 is also connected to the water storage section 23 through the water reservoir case 25. The drainage channel 8 is also formed with a hose connection portion 8a. One end of the drainage hose 47 shown in FIG. 1 is connected to the hose connection portion 8a.

The drain hose 47 extends from the hose connection portion 8a to the outside of the housing 1. The other end of the drain hose 47 is connected to a drain outlet (not shown) provided on the outside of the dishwasher. This allows the drain hose 47 to connect the water reservoir case 25 to the drain outlet through the drainage channel 8. The drain hose 47 is also provided with a drain solenoid valve (not shown).

As shown in FIG. 5, the water distributor 26 is disposed in the storage space 10 and is attached to the water storage case 25. The water distributor 26 is fixed to the bottom wall 3e of the cleaning tank 3 together with the water storage case 25.

As shown in Figures 1 and 2, the water supply duct 27 is disposed within the cleaning space 100. Cleaning water can flow through the water supply duct 27. The water supply duct 27 is composed of a first duct 27a, a second duct 27b, a third duct 27c, and a branch duct 27d. The first duct 27a is located above the lower wall 3e and extends in the front-rear direction. The front end of the first duct 27a is connected to the water distributor 26 at a position different from the connecting tube portion 25a.

The second duct 27b is fixed to the rear wall 3c and extends vertically along the rear wall 3c. The lower end of the second duct 27b is connected to the rear end of the first duct 27a. The third duct 27c extends in the front-rear direction along the upper wall 3d. The rear end of the third duct 27c is connected to the upper end of the first duct 27a. The branch duct 27d is connected to the second duct 27b at a location that is approximately the center of the second duct 27b in the vertical direction, and extends forward from the second duct 27b.

The second injection nozzle 32 is rotatably connected to the front end of the branch duct 27d, and the third injection nozzle 33 is rotatably connected to the front end of the third duct 27c. In this case, the second injection nozzle 32 and the third injection nozzle 33 are connected to the front end of the branch duct 27d and the front end of the third duct 27c from below. As with the first injection nozzle 31, the second and third injection nozzles 32 and 33 are also formed with a plurality of injection sections 300.

The air circulation device 28 is composed of a ventilation section 37, a ventilation duct 28a shown in Figures 1 and 3, a connection hose 28b shown in Figure 3, an air supply fan 28c shown in Figure 1, and an air supply section 28d shown in Figure 2.

As shown in FIG. 1, the ventilation section 37 is fixed to the right side wall 3a of the cleaning tank 3. The ventilation section 37 is disposed on the right side wall 3a at a distance above and rearward of the supply line side connection section 35. A plurality of ventilation holes 37a are formed in the ventilation section 37. Each ventilation hole 37a penetrates the ventilation section 37 in the left-right direction.

As shown in FIG. 3, the ventilation duct 28a is attached to the right side wall 3a of the cleaning tank 3 and is located between the right side wall 3a and the right panel 1a of the housing 1. In other words, the ventilation duct 28a is located outside the cleaning space 100. The ventilation duct 28a is connected to the ventilation section 37. As a result, the ventilation duct 28a is connected to each ventilation port 37a of the ventilation section 37, and thereby communicates with the inside of the cleaning space 100. The ventilation duct 28a extends from the connection point with the ventilation section 37 while curving upward toward the rear, and then extends linearly downward toward the right side wall 3a. Air can flow inside the ventilation duct 28a.

The connection hose 28b is disposed within the storage space 10. The connection hose 28b is connected to the lower end of the ventilation duct 28a and extends leftward within the storage space 10. As shown in FIG. 1, the air supply fan 28c is disposed within the storage space 10. Although detailed illustration is omitted, the air supply fan 28c has a housing and a fan body provided within the housing. The air supply fan 28c is connected to the connection hose 28b on the opposite side to the ventilation duct 28a. The air supply fan 28c is also electrically connected to the control unit 21.

The air supply unit 28d shown in FIG. 2 is connected to the air supply fan 28c and is inserted into the bottom wall 3e of the cleaning tank 3, and extends into the cleaning space 100.

The locking device 50 is fixed to the upper wall 3d of the cleaning tank 3. As a result, the locking device 50 is located above the tank opening 3f and approximately in the center of the cleaning tank 3 in the left-right direction. The locking device 50 locks the lid body 5 that has been displaced to the closed position, thereby holding the lid body 5 in the closed position.

As shown in FIG. 5, the water supply pump 43 is electrically connected to the control unit 21. The water supply pump 43 is also connected to the water distributor 26 at a position different from the supply line 6.

As shown in FIG. 6, the drainage pump 45 is electrically connected to the control unit 21. As described above, the drainage pump 45 is attached to the water reservoir case 25. This connects the drainage pump 45 to the drainage channel 8.

As shown in Figures 4 to 7, the filter unit 29 is composed of a first body 61, a second body 62, a third body 63, and a fourth body 64.

As shown in FIG. 7, the first body 61 is formed in a substantially rectangular plate shape in a plan view. The first body 61 is made of metal. The first body 61 has a first filter portion 61a, an insertion hole 61b, and multiple communication holes 61c. The first filter portion 61a occupies almost the entire area of the first body 61. The first filter portion 61a has multiple first holes 610 formed therein. Each of the first holes 610 has a circular hole shape. Each of the first holes 610 is distributed over almost the entire area of the first filter portion 61a, i.e., over almost the entire area of the first body 61 except for the insertion hole 61b and each communication hole 61c, and penetrates the first filter portion 61a in the vertical direction.

The insertion hole 61b and each communication hole 61c are formed in the first filter part 61a and penetrate the first filter part 61a in the up-down direction. Each communication hole 61c is arranged outside the insertion hole 61b. Each communication hole 61c is arranged at equal intervals in the circumferential direction of the insertion hole 61b and surrounds the insertion hole 61b from the outside. The first body 61 can be formed from a so-called punching metal in which multiple through holes corresponding to the first hole 610 are formed. The first body 61 may also be made of resin.

As shown in Figures 5 to 8, the second body 62 is made of resin. The second body 62 is composed of a second filter portion 62a, a first guide portion 62b, a second guide portion 62c, a flange portion 62d, and an extension portion 62e.

As shown in FIG. 8, the second filter portion 62a is formed in a cylindrical shape extending in the vertical direction and can be inserted into the insertion hole 61b of the first body 61. The second filter portion 62a is formed with a plurality of second holes 620, two locking pieces 621, and an engagement rib 622. Note that in FIG. 8, for ease of explanation, the water reservoir case 25 and the like are not shown, and some of the first holes 610 are not shown.

Each second hole 620 is formed on the outer peripheral surface of the second filter part 62a, and extends in the circumferential direction of the second filter part 62a while being disposed in the up-down direction of the second filter part 62a. Each second hole 620 penetrates the second filter part 62a in the radial direction. In other words, the second hole 620 has a substantially rectangular long hole shape extending in the circumferential direction of the second filter part 62a. In addition, since each second hole 620 is separated from each other in the up-down direction and the circumferential direction of the second filter part 62a, each second hole 620 is not connected to each other.

Each locking piece 621 is formed on the outer peripheral surface of the second filter part 62a and is disposed at the upper part of the second filter part 62a. Each locking piece 621 protrudes from the outer peripheral surface of the second filter part 62a toward the outside of the second filter part 62a. The locking pieces 621 are disposed at equal intervals in the circumferential direction of the second filter part 62a. The engagement rib 622 is disposed at the lower part of the second filter part 62a. The engagement rib 622 goes around the circumferential direction of the second filter part 62a while protruding toward the outside of the second filter part 62a.

As shown in FIG. 5, the first guide portion 62b and the second guide portion 62c are formed on the inside of the second filter portion 62a. The first guide portion 62b is disposed above the second guide portion 62c. The first guide portion 62b and the second guide portion 62c extend at an incline in the vertical direction of the second filter portion 62a so as to direct the cleaning water and residue flowing inside the second filter portion 62a toward each second hole 620. Note that one of the first guide portion 62b and the second guide portion 62c may be omitted, or a guide portion may be formed on the inside of the second filter portion 62a in addition to the first guide portion 62b and the second guide portion 62c.

As shown in FIG. 8, the flange 62d is integral with the upper end of the second filter portion 62a. The flange 62d is formed with a larger diameter than the second filter portion 62a. As shown in FIG. 9, the flange 62d is formed with one first communication hole 623 and multiple second communication holes 624. Each of the second communication holes 624 is an example of a "communication hole" according to the present invention.

The first communication hole 623 is located in the center of the flange 62d. The first communication hole 623 penetrates the flange 62d in the vertical direction and communicates with the second filter part 62a. By forming the first communication hole 623 in the flange 62d in this way, the flange 62d has a circular ring shape with a larger diameter than the second filter part 62a.

Each second communication hole 624 is formed with a smaller diameter than the first communication hole 623, and each penetrates the flange portion 62d in the vertical direction. Each second communication hole 624 is arranged at a location that is outside the first communication hole 623 and outside the second filter portion 62a. Each second communication hole 624 is arranged at equal intervals in the circumferential direction of the first communication hole 623, and surrounds the first communication hole 623 from the outside. The number of second communication holes 624 can be designed as appropriate.

The extension 62e is integral with the outer periphery of the flange 62d and extends upward from the flange 62d while surrounding it.

7 and 8, the third body 63 is composed of a third filter portion 63a and a frame portion 63b. The third filter portion 63a is formed by processing a metal plate material into a cylindrical shape. More specifically, the third filter portion 63a has a cylindrical shape with a larger diameter than the second filter portion 62a of the second body 62. The third filter portion 63a has a plurality of third holes 630. Each of the third holes 630 has a round hole shape. Each of the third holes 630 is distributed over almost the entire area of the third filter portion 63a and penetrates the third filter portion 63a in the radial direction. The third filter portion 63a can also be formed of a punching metal in which a plurality of through holes corresponding to the third holes 630 are formed. The third filter portion 63a may also be made of resin.

The frame portion 63b is made of resin and is formed in a generally cylindrical frame shape extending in the vertical direction. The frame portion 63b is also formed with a larger diameter than the second filter portion 62a. The third filter portion 63a is assembled to the frame portion 63b. In this way, the frame portion 63b holds the third filter portion 63a. As shown in FIG. 8, the frame portion 63b is formed with a plurality of engaging claws 631. Each engaging claw 631 protrudes toward the inside of the frame portion 63b. The upper and lower portions of the frame portion 63b are formed symmetrically.

As shown in FIG. 7, the fourth body 64 is formed in a substantially rectangular plate shape in a plan view. The fourth body 64 is made of resin. The fourth body 64 has a fourth filter portion 64a, first to third mounting holes 64b to 64d, and first to third screw holes 64e to 64g. The fourth filter portion 64a occupies almost the entire area of the fourth body 64. The fourth filter portion 64a has a plurality of fourth holes 640 formed therein, as well as a support piece 641 formed therein. Each fourth hole 640 has a circular hole shape. Each fourth hole 640 is distributed over almost the entire area of the fourth filter portion 64a, and penetrates the fourth filter portion 64a in the vertical direction.

The support piece 641 is formed on the front edge of the fourth filter part 64a and protrudes forward of the fourth filter part 64a. The fourth body 64 may be made of metal such as punched metal.

The first to third mounting holes 64b to 64d and the first to third screw holes 64e to 64g are respectively formed in the fourth filter portion 64a and pass through the fourth filter portion 64a in the up-down direction.
The first mounting hole 64b is adapted to receive the connecting tube portion 25a of the water reservoir case 25. The second and third mounting holes 64c, 64d are adapted to receive the first duct 27a. The first to third screw holes 64e to 64g are adapted to receive the first to third mounting screws 65a to 65c shown in FIG. 4, respectively.

As shown in FIG. 7, in the filter unit 29, the opening area of each first hole 610 of the first filter section 61a, the opening area of each third hole 630 of the third filter section 63a, and the opening area of each fourth hole 640 of the fourth filter section 64a are all equal. Specifically, the inner diameter of each first hole 610, each third hole 630, and each fourth hole 640 is set to about 2 mm.

On the other hand, the opening area of each second hole 620 of the second filter section 62a is larger than the opening area of each first hole 610, each third hole 630, and each fourth hole 640. Furthermore, the opening area of each second communication hole 624 and each communication hole 61c is also larger than the opening area of each first hole 610, each third hole 630, and each fourth hole 640. Note that the opening areas of each first hole 610, each third hole 630, and each fourth hole 640 may differ from each other as long as they are smaller than the opening area of each second hole 620. Furthermore, the opening area of the second communication hole 624 and the opening area of each communication hole 61c of the first body 61 may be the same or different from each other.

As shown in Figures 5, 6 and 8, in this dishwasher, the filter unit 29 is arranged throughout the washing space 100, the water storage section 23 and the water storage case 25. To arrange the filter unit 29, first, as shown in Figure 4, the connecting tube section 25a of the water storage case 25 is inserted into the first mounting hole 64b of the fourth body 64, and the first duct 27a is attached to the second and third mounting holes 64c and 64d. Then, in this state, the fourth body 64 is fixed to the bottom wall 3e of the washing tub 3 by the first to third mounting screws 65a to 65c. At this time, the second and third mounting screws 65b and 65c fix the fourth body 64 together with the first duct 27a to the bottom wall 3e.

Next, in the filter unit 29, the third body 63 is placed below the first body 61 as shown in Figs. 5 to 8. Then, in this state, the second filter portion 62a of the second body 62 is inserted from above into the insertion hole 61b of the first body 61 shown in Fig. 7. As a result, as shown in Fig. 8, the second filter portion 62a enters the third body 63, that is, inside the third filter portion 63a and the frame portion 63b. Also, in the second filter portion 62a, each locking piece 621 engages with the outer periphery of the insertion hole 61b. This allows the first body 61 and the second body 62 to be assembled. Also, at this time, each communication hole 61c of the first body 61 communicates with each second communication hole 624 from below.

Furthermore, in the second filter portion 62a, the engagement rib 622 engages with the engagement claw 631 of the third body 63. This causes the second body 62 and the third body 63 to be assembled together, and the third body 63, when assembled to the second body 62, is positioned below the first body 61. In this way, the second body 62 is assembled to the first body 61 and the third body 63, and the first to third bodies 61 to 63 are assembled together.

Then, as shown in Figures 5 and 6, the first body 61 is placed on the bottom wall 3e of the cleaning tank 3 and the support piece 641 of the fourth body 64. As a result, the first body 61 and the fourth body 64 are attached to the bottom wall 3e and cover the water storage section 23 from above. The third body 63 is placed in the water storage case 25 with its upper part protruding into the water storage section 23 from the communication port 23a.

As shown in Figs. 5, 6 and 8, in the filter unit 29, the third filter portion 63a is formed in a cylindrical shape with a larger diameter than the second filter portion 62a. When the second filter portion 62a enters the inside of the third filter portion 63a and the frame portion 63b, the third filter portion 63a covers the second filter portion 62a from the outside. As a result, a cylindrically extending gap S is formed between the second filter portion 62a and the third filter portion 63a. The second holes 620 of the second filter portion 62a and the third holes 630 of the third filter portion 63a face each other in the radial direction of the second filter portion 62a and the third filter portion 63a through the gap S. The gap S also communicates with the inside of the water reservoir case 25 at the lower end.

Furthermore, in the second body 62, the flange portion 62d covers the gap S from above. And each second communication hole 624 communicates with the gap S from above through each communication hole 61c.

In the filter unit 29, the first body 61 is merely placed on the bottom wall 3e and the fourth body 64, and is not fixed to the bottom wall 3e and the fourth body 64. Furthermore, the first body 61 and the second body 62 are detachable by engaging or disengaging each locking piece 621 of the second filter part 62a with the outer periphery of the insertion hole 61b of the first body 61. Also, the second body 62 and the third body 63 are detachable by engaging or disengaging the engagement rib 622 of the second filter part 62a with the engagement claw 631 of the third body 63.

As a result, in the filter unit 29, when the first to third bodies 61 to 63 are assembled together, these first to third bodies 61 to 63 can be removed together from the washing tank 3 and the water storage case 25, and the user can wash the first to third bodies 61 to 63 outside the dishwasher. At this time, the user can also disassemble the first to third bodies 61 to 63 while washing them, if necessary.

The storage tank 7 shown in FIG. 1 stores a dish rinse as a treatment agent inside. The treatment agent may also be a dish detergent, etc.

The storage tank 7 is attached to the supply line side connection part 35 and the ventilation part 37, and is disposed within the cleaning space 100. Although detailed illustration is omitted, the storage tank 7 is detachable from the supply line side connection part 35 and the ventilation part 37. This makes it possible to remove the storage tank 7 from the supply line side connection part 35 and the ventilation part 37 and take the storage tank 7 outside the cleaning space 100. In this way, it is possible to replenish the treatment agent in the storage tank 7 outside the cleaning space 100.

The storage tank 7 is attached to the supply line side connection part 35 and the ventilation part 37, and is connected to the treatment agent supply device 9 through the supply line side connection part 35 and the supply line main body 34 shown in FIG. 3. In addition, the storage tank 7 is attached to the ventilation part 37, and the inside of the storage tank 7 is connected to the ventilation duct 28a through the ventilation part 37.

The first dish basket 13, the second dish basket 14, and the third dish basket 15 shown in FIG. 1 are each capable of placing items to be washed (not shown). The first dish basket 13, the second dish basket 14, and the third dish basket 15 are divided into categories for the items to be washed, depending on the type of item to be washed, etc. The first dish basket 13 is designed to mainly hold large items to be washed. Examples of items to be washed include tableware such as plates and bowls, as well as eating and drinking utensils such as chopsticks and cups, and cooking vessels such as pots.

The first dishwashing basket 13 can be taken in and out of the washing space 100 while being guided in the front-to-rear direction by the first lower guide member 111 and the second lower guide member 114 shown in Figure 2, and can be stored in the washing space 100 in a horizontal position in the front-to-rear and left-to-right directions by the first lower guide member 111 and the second lower guide member 114. Similarly, the second dishwashing basket 14 can be taken in and out of the washing space 100 while being guided in the front-to-rear direction by the first middle guide member 112 and the second middle guide member 115, and can be stored in the washing space 100 in a horizontal position in the front-to-rear and left-to-right directions by the first middle guide member 112 and the second middle guide member 115. The third dish basket 15 can be taken in and out of the washing space 100 while being guided in the front-to-back direction by the first upper guide member 113 and the second upper guide member 116, and can be stored in the washing space 100 in a horizontal position in the front-to-back and left-to-right directions by the first upper guide member 113 and the second upper guide member 116.

In addition, the first dish basket 13 has a handle portion 13a and an interference portion 13b. The handle portion 13a is provided at the front portion of the first dish basket 13. The handle portion 13a can be grasped by the user when inserting or removing the first dish basket 13 from the cleaning space 100.

The interference portion 13b is provided on the right side of the first dish basket 13. Although detailed illustration is omitted, the interference portion 13b extends leftward from the right side of the first dish basket 13 and then extends above the first dish basket 13. When the first dish basket 13 is housed in the washing space 100 with the storage tank 7 disposed in the washing space 100, the interference portion 13b faces the storage tank 7 from the left without coming into contact with the storage tank 7 if the storage tank 7 is properly attached to the supply path side connection portion 35 and the ventilation portion 37. In contrast, when the storage tank 7 is not completely attached to the supply path side connection portion 35 and the ventilation portion 37, the interference portion 13b interferes with the storage tank 7 when the first dish basket 13 is housed in the washing space 100.

As shown in FIG. 1, the operation unit 19 is provided on the lid 5 and is arranged on the upper part of the inner panel 5b. The operation unit 19 is electrically connected to the control unit 21. The operation unit 19 also has operation buttons and a display (not shown). The operation unit 19 allows the user to operate the dishwasher via the operation buttons. The operation unit 19 also displays the operation time, etc. on the display. The operation unit 19 may also be arranged on the outer panel 5a.

The control unit 21 is provided on the cover 5 and is disposed between the outer panel 5a and the inner panel 5b. The control unit 21 controls the operation of the water supply pump 43, the drain pump 45, the water supply solenoid valve, the drain solenoid valve, the air supply fan 28c, and the supply device main body 9a. In this way, the control unit 21 executes the washing operation, the rinsing operation, and the drying operation. The control unit 21 may be disposed within the storage space 10.

When washing the items to be washed in this dishwasher, the user attaches the storage tank 7 in which the treatment agent is stored to the supply line side connection part 35 and the ventilation part 37. Then, in this state, the user places the first to third dish baskets 13 to 15, in which the items to be washed are placed, in the washing space 100. After that, the user swings the lid body 5 to the closed position and operates the operating part 19. As a result, in this dishwasher, the control part 21 executes the washing operation, the rinsing operation, and the drying operation in that order. Note that the control part 21 can also execute only any one of the washing operation, the rinsing operation, and the drying operation.

In the washing operation, the control unit 21 opens the water supply solenoid valve provided on the water supply hose 41 and operates the water supply pump 43. As a result, water from the water supply source is sprayed as washing water from each spraying part 300 of the first spray nozzle 31 through the water supply hose 41, the water supply pump 43, the water distributor 26, and the connecting tube part 25a into the washing space 100. Also, washing water is sprayed from the water distributor 26 through the water supply duct 27 from each spraying part 300 of the second and third spray nozzles 32 and 33 into the washing space 100. Also, in the washing operation, dish detergent is supplied into the washing space 100 by an automatic detergent supplying device (not shown) provided in the washing tank 3. Thus, in the washing operation, the objects to be washed are washed with washing water containing detergent. In addition, in the washing operation, a predetermined amount of water is supplied from the water supply source, and the control unit 21 closes the water supply solenoid valve.

In this way, as the object to be washed is washed with the washing water in the washing space 100, food residue and other debris attached to the object to be washed falls off from the object to be washed. As a result, the debris is contained in the washing water and flows downward within the washing space 100 together with the washing water. In this way, the washing water containing the debris flows through the filter unit 29 and is stored in the water storage section 23 and the water storage case 25, as shown by the solid arrows in Figures 5, 6, and 8.

More specifically, in the filter unit 29, cleaning water containing residue in the cleaning space 100 flows through the first filter section 61a of the first body 61, the fourth filter section 64a of the fourth body 64, or the second filter section 62a from the extension section 62e of the second body 62 via the first communication hole 623.

Here, in the first filter section 61a, while the cleaning water flows through each of the first holes 610, residues larger than each of the first holes 610 cannot pass through each of the first holes 610 and are collected in each of the first holes 610. Similarly, in the fourth filter section 64a, while the cleaning water flows through each of the fourth holes 640, residues larger than each of the fourth holes 640 cannot pass through each of the fourth holes 640 and are collected in each of the fourth holes 640. In this way, the cleaning water that has flowed through the first filter section 61a and the fourth filter section 64a and the residues smaller than each of the first holes 610 and each of the fourth holes 640 are stored in the water storage section 23 and the water storage case 25.

In the second filter section 62a, the cleaning water and residue flowing therethrough are rectified by the first guide section 62b and the second guide section 62c, and flow in the radial direction of the second filter section 62a toward each of the second holes 620. In the second filter section 62a, the cleaning water flows through each of the second holes 620, while residue larger than each of the second holes 620 cannot pass through each of the second holes 620 and is collected in each of the second holes 620.

In this way, the cleaning water and residue smaller than each second hole 620 flow to the outside of the second filter section 62a toward the gap S and further toward the third filter section 63a of the third body 63. As a result, in the third filter section 63a, of the cleaning water and residue that flowed through the gap S, the cleaning water flows through each third hole 630 and flows toward the water reservoir case 25 in the radial direction of the third filter section 63a. On the other hand, residue larger than each third hole 630, i.e., residue smaller than each second hole 620 and larger than each third hole 630, cannot pass through each third hole 630 and is collected in each third hole 630.

As a result, the cleaning water that has flowed through each of the third holes 630 and residues smaller than the size of each of the third holes 630 are stored in the water reservoir case 25. In this dishwasher, the cleaning water that has passed through the filter unit 29, i.e., the cleaning water that has passed through each of the first holes 610, each of the fourth holes 640, or each of the third holes 630, flows from the first connection port 251 shown in FIG. 5 through the supply passage 6 toward the water supply pump 43. Then, this cleaning water is sprayed again into the cleaning space 100 from each of the spraying parts 300 of the first to third spray nozzles 31 to 33 through the water distributor 26 and the water supply duct 27 by the water supply pump 43. As a result, the cleaning of the objects to be washed in the cleaning space 100 continues until the cleaning time set as the cleaning operation has elapsed.

When the cleaning time set for the cleaning operation has elapsed, the control unit 21 opens the drain solenoid valve provided on the drain hose 47 and operates the drain pump 45. The control unit 21 also stops the water supply pump 43.

This ends the washing operation of the dishwasher. Then, the washing water that has passed through the filter unit 29 as described above is discharged to the outside of the dishwasher by circulating through the drainage channel 8 and the drainage hose 47 from the second connection port 252 shown in FIG. 6 by the drain pump 45. At this time, the residue that has passed through each of the first holes 610, each of the fourth holes 640, and each of the third holes 630 is also inevitably discharged to the outside of the dishwasher together with the washing water.

Since each of the first hole 610, the third hole 630, and the fourth hole 640 is a round hole with an inner diameter of about 2 mm, the residue passing through each of the first hole 610, the third hole 630, and the fourth hole 640 is extremely small. Therefore, the impact of the residue being discharged outside the dishwasher is small.

In the rinsing operation, the control unit 21 opens the water supply solenoid valve and operates the water supply pump 43. As a result, similar to the washing operation, water from the water supply source is sprayed as washing water from each of the spraying units 300 of the first to third spray nozzles 31 to 33 into the washing space 100. Also, in the rinsing operation, the control unit 21 operates the supply device main body 9a. As a result, the treatment agent stored in the storage tank 7 flows into the supply device main body 9a via the treatment agent supply path 11. The treatment agent is then automatically supplied into the washing space 100 from the treatment agent supply port 9b. Thus, in the rinsing operation, the object to be washed is rinsed with washing water containing the treatment agent.

When the cleaning time set for the rinsing operation has elapsed, the control unit 21 discharges the cleaning water in the cleaning space 100 to the outside of the dishwasher, just as in the cleaning operation. This ends the rinsing operation.

In the drying operation, the control unit 21 operates the air supply fan 28c. This causes air in the cleaning space 100 to flow through the ventilation duct 28a from each ventilation port 37a of the ventilation unit 37. The air in the ventilation duct 28a is also supplied from the air supply unit 28d to the cleaning space 100 via the connection hose 28b and the air supply fan 28c. In this way, in the drying operation, the object to be washed is dried while air circulates between the inside of the cleaning space 100 and the outside of the cleaning space 100, i.e., the outside of the cleaning tank 3. When the cleaning time set for the drying operation has elapsed, the control unit 21 stops the air supply fan 28c. This ends the drying operation.

In this way, in this dishwasher, residue can be effectively collected by the first holes 610, the second holes 620, the third holes 630, and the fourth holes 640 of the filter unit 29, and by extension the first to fourth filter sections 61a to 64a. As a result, in this dishwasher, residue is less likely to be contained in the wash water flowing from the water storage case 25 through the supply passage 6, and in the wash water flowing from the water storage case 25 through the drain passage 8.

As shown by solid arrows in Figures 5, 6 and 8, in the filter unit 29, a portion of the cleaning water in the cleaning space 100 also flows into the gap S by passing through each second communication hole 624 and each communication hole 61c of the first body 61 from the extension portion 62e of the second body 62. The cleaning water that passes through each second communication hole 624 and each communication hole 61c flows from the top to the bottom in the gap S along the second filter portion 62a and the third filter portion 63a. In other words, the cleaning water that flows into the gap S through each second communication hole 624 and each communication hole 61c flows so as to cross the cleaning water and residue that flows from each second hole 620 of the second filter portion 62a toward the gap S.

There are multiple second communication holes 624 and multiple connection holes 61c. Furthermore, the opening area of each second communication hole 624 and each connection hole 61c is larger than the opening area of each first hole 610, each third hole 630, and each fourth hole 640. Therefore, in this dishwasher, it is possible to appropriately ensure the flow rate of washing water flowing through each second communication hole 624 and each connection hole 61c into the gap S.

For these reasons, in this dishwasher, even if residues collected in each of the third holes 630 adhere to the third filter section 63a, such residues can be suitably removed from the third filter section 63a by the wash water that flows into the gap S via each of the second communication holes 624 and each of the connection holes 61c. In other words, in this dishwasher, the number of times that the first to third bodies 61 to 63 are removed from the washing tank 3 and the water storage case 25 to perform the washing operation of the first to third bodies 61 to 63 is minimized, while still suitably preventing clogging of each of the third holes 630 by residues.

As a result, in this dishwasher, clogging of each third hole 630 by residues does not easily occur, and the flow of washing water toward the supply passage 6 and the drain passage 8 is not easily hindered. Therefore, in this dishwasher, the amount of washing water supplied to the washing space 100 by the water supply pump 43 through the supply passage 6 can be suitably secured, and the amount of washing water discharged to the outside of the dishwasher by the drain pump 45 through the drain passage 8 can be suitably secured. Strictly speaking, in this dishwasher, not only the washing water but also the residues smaller than each second communication hole 624 and each communication hole 61c will flow together with the washing water through each second communication hole 624 and each communication hole 61c into the gap S. Then, the residues that flow through each second communication hole 624 and each communication hole 61c will accumulate in the water reservoir case 25 through the gap S.

Therefore, the dishwasher of the embodiment has excellent residue collection performance, as well as excellent cleaning and drainage performance.

In addition, in this dishwasher, the first guide portion 62b and the second guide portion 62c of the second body 62 can guide the cleaning water and residue flowing through the second filter portion 62a toward each second hole 620 while rectifying the flow. Therefore, in this dishwasher, the cleaning water and residue can flow smoothly through the second filter portion 62a, and the residue can be collected smoothly in each second hole 620 and further in each third hole 630 of the third body 63.

In addition, in this dishwasher, the first body 61 and the second body 62 are detachable, and the second body 62 and the third body 63 are detachable. This allows the user to handle the first to third bodies 61 to 63 as a whole, and also makes it easy to disassemble the first to third bodies 61 to 63 as needed.

In addition, by assembling the second body 62 and the third body 63, the second filter part 62a and the third filter part 63a can be easily positioned in this dishwasher. Therefore, in this dishwasher, it is possible to preferably form a gap S between the second filter part 62a and the third filter part 63a.

In addition, in this dishwasher, the flange 62d of the second body 62 covers the gap S from above, making it difficult for residue to enter the gap S from above. Also, by forming each second communication hole 624 in the flange 62d, it is possible to easily form each second communication hole 624 while allowing each second communication hole 624 to be suitably connected to the gap S from above.

Although the present invention has been described above with reference to examples, it goes without saying that the present invention is not limited to the above examples and can be modified as appropriate without departing from the spirit of the invention.

For example, in the dishwasher of the embodiment, the filter unit 29 is made up of the first to fourth bodies 61 to 64. However, this is not limited to the above, and the fourth body 64 may be omitted, and the filter unit 29 may be made up of the first to third bodies 61 to 63.

In addition, in the dishwasher of the embodiment, the supply channel 6 and the drain channel 8 are formed integrally with the water storage case 25. However, this is not limited to the above, and the supply channel 6 and the drain channel 8 may be formed separately from the water storage case 25, and the supply channel 6 and the drain channel 8 may be connected to the water storage case 25.

In addition, in the dishwasher of the embodiment, the water storage case 25 may be omitted, and the supply channel 6 and the drain channel 8 may be directly connected to the water storage section 23.

In addition, in the dishwasher of the embodiment, the first body 61 or the third body 63 may be configured to have a "communication hole" according to the present invention.

In addition, in the dishwasher of the embodiment, instead of the water supply pump 43 and the drain pump 45, a single pump capable of supplying wash water and draining wash water may be provided.

In addition, in the dishwasher of the embodiment, the washing tank 3 may be movable relative to the housing 1.

The present invention can be used in dishwashers, dishwasher-dryers, kitchen equipment, etc.

3: cleaning tank 6: supply channel 8: drain channel 23: water storage section 29: filter unit 43: water supply pump (pump)
61: First body; 61a: First filter portion; 62: Second body; 62a: Second filter portion; 62b: First guide portion (guide portion)
62c...Second guide part (guide part)
62d: flange portion 63: third body 63a: third filter portion 100: cleaning space 610: first hole 620: second hole 624: second communication hole (communication hole)
630...Third hole S...Void

Claims (5)

a cleaning tank having a cleaning space in which an object to be cleaned can be cleaned with cleaning water and a water storage section located below the cleaning space and storing the cleaning water;
a filter unit capable of collecting residue contained in the cleaning water while circulating the cleaning water;
a pump capable of supplying the cleaning water to the cleaning space;
a supply passage communicating with the water storage section and for circulating the cleaning water that has passed through the filter unit to the pump;
a discharge passage communicating with the water storage section and discharging the cleaning water that has passed through the filter unit to the outside of the cleaning tank;
the filter unit includes a first body that is provided in the cleaning tank and covers the water storage portion from above, a second body that is inserted into the first body, and a third body that is located below the first body,
The first body has a first filter portion having a plate shape,
the second body has a cylindrical shape extending downwardly beyond the first filter portion and includes a second filter portion through which the cleaning water and the residue can flow,
the third body has a cylindrical third filter portion having a larger diameter than the second filter portion and covering the second filter portion from the outside,
The first filter section is formed with a plurality of first holes that communicate with the water storage section and allow the cleaning water to flow while collecting the residue that is larger than the first filter section;
The second filter portion is formed with a plurality of second holes each having an opening area larger than each of the first holes and capable of collecting the residue larger than the second filter portion while allowing the cleaning water to flow therethrough,
The third filter portion is formed with a plurality of third holes each having an opening area smaller than each of the second holes and capable of collecting the residue larger than the third filter portion while allowing the cleaning water to flow therethrough,
A cylindrical gap is formed between the second filter portion and the third filter portion, the gap communicating with each of the second holes and each of the third holes.
The cleaning water and the residue flowing through each of the second holes flow to the outside of the second filter portion toward the gap,
A dishwasher characterized in that the first body, the second body or the third body has a communication hole formed therein that communicates with the gap from above and allows the cleaning water to flow within the gap from above to below. The communication holes are multiple,
2. The dishwasher according to claim 1, wherein the communication holes have an opening area larger than that of the first holes and the third holes. The dishwasher according to claim 1 or 2, wherein the second body has a guide portion formed inside the second filter portion and capable of guiding the cleaning water and the residue flowing through the second filter portion toward each of the second holes. The second body and the third body are detachable,
3. The dishwasher according to claim 1, wherein the third body is located below the first body when assembled to the second body. the second body has a flange portion connected to the second filter portion and covering the gap from above,
3. The dishwasher according to claim 1, wherein the communication hole is formed in the flange.

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